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diff --git a/Documentation/ABI/testing/sysfs-class-powercap b/Documentation/ABI/testing/sysfs-class-powercap index f333a0ccc29b..ca491ec4e693 100644 --- a/Documentation/ABI/testing/sysfs-class-powercap +++ b/Documentation/ABI/testing/sysfs-class-powercap @@ -5,7 +5,7 @@ Contact: linux-pm@vger.kernel.org Description: The powercap/ class sub directory belongs to the power cap subsystem. Refer to - Documentation/power/powercap/powercap.txt for details. + Documentation/power/powercap/powercap.rst for details. What: /sys/class/powercap/<control type> Date: September 2013 diff --git a/Documentation/PCI/acpi-info.txt b/Documentation/PCI/acpi-info.rst index 3ffa3b03970e..060217081c79 100644 --- a/Documentation/PCI/acpi-info.txt +++ b/Documentation/PCI/acpi-info.rst @@ -1,4 +1,8 @@ - ACPI considerations for PCI host bridges +.. SPDX-License-Identifier: GPL-2.0 + +======================================== +ACPI considerations for PCI host bridges +======================================== The general rule is that the ACPI namespace should describe everything the OS might use unless there's another way for the OS to find it [1, 2]. @@ -131,12 +135,13 @@ address always corresponds to bus 0, even if the bus range below the bridge [4] ACPI 6.2, sec 6.4.3.5.1, 2, 3, 4: QWord/DWord/Word Address Space Descriptor (.1, .2, .3) - General Flags: Bit [0] Ignored + General Flags: Bit [0] Ignored Extended Address Space Descriptor (.4) - General Flags: Bit [0] Consumer/Producer: - 1–This device consumes this resource - 0–This device produces and consumes this resource + General Flags: Bit [0] Consumer/Producer: + + * 1 – This device consumes this resource + * 0 – This device produces and consumes this resource [5] ACPI 6.2, sec 19.6.43: ResourceUsage specifies whether the Memory range is consumed by diff --git a/Documentation/PCI/endpoint/index.rst b/Documentation/PCI/endpoint/index.rst new file mode 100644 index 000000000000..d114ea74b444 --- /dev/null +++ b/Documentation/PCI/endpoint/index.rst @@ -0,0 +1,13 @@ +.. SPDX-License-Identifier: GPL-2.0 + +====================== +PCI Endpoint Framework +====================== + +.. toctree:: + :maxdepth: 2 + + pci-endpoint + pci-endpoint-cfs + pci-test-function + pci-test-howto diff --git a/Documentation/PCI/endpoint/pci-endpoint-cfs.txt b/Documentation/PCI/endpoint/pci-endpoint-cfs.rst index d740f29960a4..b6d39cdec56e 100644 --- a/Documentation/PCI/endpoint/pci-endpoint-cfs.txt +++ b/Documentation/PCI/endpoint/pci-endpoint-cfs.rst @@ -1,41 +1,51 @@ - CONFIGURING PCI ENDPOINT USING CONFIGFS - Kishon Vijay Abraham I <kishon@ti.com> +.. SPDX-License-Identifier: GPL-2.0 + +======================================= +Configuring PCI Endpoint Using CONFIGFS +======================================= + +:Author: Kishon Vijay Abraham I <kishon@ti.com> The PCI Endpoint Core exposes configfs entry (pci_ep) to configure the PCI endpoint function and to bind the endpoint function with the endpoint controller. (For introducing other mechanisms to configure the PCI Endpoint Function refer to [1]). -*) Mounting configfs +Mounting configfs +================= The PCI Endpoint Core layer creates pci_ep directory in the mounted configfs -directory. configfs can be mounted using the following command. +directory. configfs can be mounted using the following command:: mount -t configfs none /sys/kernel/config -*) Directory Structure +Directory Structure +=================== The pci_ep configfs has two directories at its root: controllers and functions. Every EPC device present in the system will have an entry in the *controllers* directory and and every EPF driver present in the system will have an entry in the *functions* directory. +:: -/sys/kernel/config/pci_ep/ - .. controllers/ - .. functions/ + /sys/kernel/config/pci_ep/ + .. controllers/ + .. functions/ -*) Creating EPF Device +Creating EPF Device +=================== Every registered EPF driver will be listed in controllers directory. The entries corresponding to EPF driver will be created by the EPF core. +:: -/sys/kernel/config/pci_ep/functions/ - .. <EPF Driver1>/ - ... <EPF Device 11>/ - ... <EPF Device 21>/ - .. <EPF Driver2>/ - ... <EPF Device 12>/ - ... <EPF Device 22>/ + /sys/kernel/config/pci_ep/functions/ + .. <EPF Driver1>/ + ... <EPF Device 11>/ + ... <EPF Device 21>/ + .. <EPF Driver2>/ + ... <EPF Device 12>/ + ... <EPF Device 22>/ In order to create a <EPF device> of the type probed by <EPF Driver>, the user has to create a directory inside <EPF DriverN>. @@ -44,34 +54,37 @@ Every <EPF device> directory consists of the following entries that can be used to configure the standard configuration header of the endpoint function. (These entries are created by the framework when any new <EPF Device> is created) - - .. <EPF Driver1>/ - ... <EPF Device 11>/ - ... vendorid - ... deviceid - ... revid - ... progif_code - ... subclass_code - ... baseclass_code - ... cache_line_size - ... subsys_vendor_id - ... subsys_id - ... interrupt_pin - -*) EPC Device +:: + + .. <EPF Driver1>/ + ... <EPF Device 11>/ + ... vendorid + ... deviceid + ... revid + ... progif_code + ... subclass_code + ... baseclass_code + ... cache_line_size + ... subsys_vendor_id + ... subsys_id + ... interrupt_pin + +EPC Device +========== Every registered EPC device will be listed in controllers directory. The entries corresponding to EPC device will be created by the EPC core. - -/sys/kernel/config/pci_ep/controllers/ - .. <EPC Device1>/ - ... <Symlink EPF Device11>/ - ... <Symlink EPF Device12>/ - ... start - .. <EPC Device2>/ - ... <Symlink EPF Device21>/ - ... <Symlink EPF Device22>/ - ... start +:: + + /sys/kernel/config/pci_ep/controllers/ + .. <EPC Device1>/ + ... <Symlink EPF Device11>/ + ... <Symlink EPF Device12>/ + ... start + .. <EPC Device2>/ + ... <Symlink EPF Device21>/ + ... <Symlink EPF Device22>/ + ... start The <EPC Device> directory will have a list of symbolic links to <EPF Device>. These symbolic links should be created by the user to @@ -81,7 +94,7 @@ The <EPC Device> directory will also have a *start* field. Once "1" is written to this field, the endpoint device will be ready to establish the link with the host. This is usually done after all the EPF devices are created and linked with the EPC device. - +:: | controllers/ | <Directory: EPC name>/ @@ -102,4 +115,4 @@ all the EPF devices are created and linked with the EPC device. | interrupt_pin | function -[1] -> Documentation/PCI/endpoint/pci-endpoint.txt +[1] :doc:`pci-endpoint` diff --git a/Documentation/PCI/endpoint/pci-endpoint.txt b/Documentation/PCI/endpoint/pci-endpoint.rst index e86a96b66a6a..0e2311b5617b 100644 --- a/Documentation/PCI/endpoint/pci-endpoint.txt +++ b/Documentation/PCI/endpoint/pci-endpoint.rst @@ -1,11 +1,13 @@ - PCI ENDPOINT FRAMEWORK - Kishon Vijay Abraham I <kishon@ti.com> +.. SPDX-License-Identifier: GPL-2.0 + +:Author: Kishon Vijay Abraham I <kishon@ti.com> This document is a guide to use the PCI Endpoint Framework in order to create endpoint controller driver, endpoint function driver, and using configfs interface to bind the function driver to the controller driver. -1. Introduction +Introduction +============ Linux has a comprehensive PCI subsystem to support PCI controllers that operates in Root Complex mode. The subsystem has capability to scan PCI bus, @@ -19,26 +21,30 @@ add endpoint mode support in Linux. This will help to run Linux in an EP system which can have a wide variety of use cases from testing or validation, co-processor accelerator, etc. -2. PCI Endpoint Core +PCI Endpoint Core +================= The PCI Endpoint Core layer comprises 3 components: the Endpoint Controller library, the Endpoint Function library, and the configfs layer to bind the endpoint function with the endpoint controller. -2.1 PCI Endpoint Controller(EPC) Library +PCI Endpoint Controller(EPC) Library +------------------------------------ The EPC library provides APIs to be used by the controller that can operate in endpoint mode. It also provides APIs to be used by function driver/library in order to implement a particular endpoint function. -2.1.1 APIs for the PCI controller Driver +APIs for the PCI controller Driver +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ This section lists the APIs that the PCI Endpoint core provides to be used by the PCI controller driver. -*) devm_pci_epc_create()/pci_epc_create() +* devm_pci_epc_create()/pci_epc_create() The PCI controller driver should implement the following ops: + * write_header: ops to populate configuration space header * set_bar: ops to configure the BAR * clear_bar: ops to reset the BAR @@ -51,110 +57,116 @@ by the PCI controller driver. The PCI controller driver can then create a new EPC device by invoking devm_pci_epc_create()/pci_epc_create(). -*) devm_pci_epc_destroy()/pci_epc_destroy() +* devm_pci_epc_destroy()/pci_epc_destroy() The PCI controller driver can destroy the EPC device created by either devm_pci_epc_create() or pci_epc_create() using devm_pci_epc_destroy() or pci_epc_destroy(). -*) pci_epc_linkup() +* pci_epc_linkup() In order to notify all the function devices that the EPC device to which they are linked has established a link with the host, the PCI controller driver should invoke pci_epc_linkup(). -*) pci_epc_mem_init() +* pci_epc_mem_init() Initialize the pci_epc_mem structure used for allocating EPC addr space. -*) pci_epc_mem_exit() +* pci_epc_mem_exit() Cleanup the pci_epc_mem structure allocated during pci_epc_mem_init(). -2.1.2 APIs for the PCI Endpoint Function Driver + +APIs for the PCI Endpoint Function Driver +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ This section lists the APIs that the PCI Endpoint core provides to be used by the PCI endpoint function driver. -*) pci_epc_write_header() +* pci_epc_write_header() The PCI endpoint function driver should use pci_epc_write_header() to write the standard configuration header to the endpoint controller. -*) pci_epc_set_bar() +* pci_epc_set_bar() The PCI endpoint function driver should use pci_epc_set_bar() to configure the Base Address Register in order for the host to assign PCI addr space. Register space of the function driver is usually configured using this API. -*) pci_epc_clear_bar() +* pci_epc_clear_bar() The PCI endpoint function driver should use pci_epc_clear_bar() to reset the BAR. -*) pci_epc_raise_irq() +* pci_epc_raise_irq() The PCI endpoint function driver should use pci_epc_raise_irq() to raise Legacy Interrupt, MSI or MSI-X Interrupt. -*) pci_epc_mem_alloc_addr() +* pci_epc_mem_alloc_addr() The PCI endpoint function driver should use pci_epc_mem_alloc_addr(), to allocate memory address from EPC addr space which is required to access RC's buffer -*) pci_epc_mem_free_addr() +* pci_epc_mem_free_addr() The PCI endpoint function driver should use pci_epc_mem_free_addr() to free the memory space allocated using pci_epc_mem_alloc_addr(). -2.1.3 Other APIs +Other APIs +~~~~~~~~~~ There are other APIs provided by the EPC library. These are used for binding the EPF device with EPC device. pci-ep-cfs.c can be used as reference for using these APIs. -*) pci_epc_get() +* pci_epc_get() Get a reference to the PCI endpoint controller based on the device name of the controller. -*) pci_epc_put() +* pci_epc_put() Release the reference to the PCI endpoint controller obtained using pci_epc_get() -*) pci_epc_add_epf() +* pci_epc_add_epf() Add a PCI endpoint function to a PCI endpoint controller. A PCIe device can have up to 8 functions according to the specification. -*) pci_epc_remove_epf() +* pci_epc_remove_epf() Remove the PCI endpoint function from PCI endpoint controller. -*) pci_epc_start() +* pci_epc_start() The PCI endpoint function driver should invoke pci_epc_start() once it has configured the endpoint function and wants to start the PCI link. -*) pci_epc_stop() +* pci_epc_stop() The PCI endpoint function driver should invoke pci_epc_stop() to stop the PCI LINK. -2.2 PCI Endpoint Function(EPF) Library + +PCI Endpoint Function(EPF) Library +---------------------------------- The EPF library provides APIs to be used by the function driver and the EPC library to provide endpoint mode functionality. -2.2.1 APIs for the PCI Endpoint Function Driver +APIs for the PCI Endpoint Function Driver +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ This section lists the APIs that the PCI Endpoint core provides to be used by the PCI endpoint function driver. -*) pci_epf_register_driver() +* pci_epf_register_driver() The PCI Endpoint Function driver should implement the following ops: * bind: ops to perform when a EPC device has been bound to EPF device @@ -166,50 +178,54 @@ by the PCI endpoint function driver. The PCI Function driver can then register the PCI EPF driver by using pci_epf_register_driver(). -*) pci_epf_unregister_driver() +* pci_epf_unregister_driver() The PCI Function driver can unregister the PCI EPF driver by using pci_epf_unregister_driver(). -*) pci_epf_alloc_space() +* pci_epf_alloc_space() The PCI Function driver can allocate space for a particular BAR using pci_epf_alloc_space(). -*) pci_epf_free_space() +* pci_epf_free_space() The PCI Function driver can free the allocated space (using pci_epf_alloc_space) by invoking pci_epf_free_space(). -2.2.2 APIs for the PCI Endpoint Controller Library +APIs for the PCI Endpoint Controller Library +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + This section lists the APIs that the PCI Endpoint core provides to be used by the PCI endpoint controller library. -*) pci_epf_linkup() +* pci_epf_linkup() The PCI endpoint controller library invokes pci_epf_linkup() when the EPC device has established the connection to the host. -2.2.2 Other APIs +Other APIs +~~~~~~~~~~ + There are other APIs provided by the EPF library. These are used to notify the function driver when the EPF device is bound to the EPC device. pci-ep-cfs.c can be used as reference for using these APIs. -*) pci_epf_create() +* pci_epf_create() Create a new PCI EPF device by passing the name of the PCI EPF device. This name will be used to bind the the EPF device to a EPF driver. -*) pci_epf_destroy() +* pci_epf_destroy() Destroy the created PCI EPF device. -*) pci_epf_bind() +* pci_epf_bind() pci_epf_bind() should be invoked when the EPF device has been bound to a EPC device. -*) pci_epf_unbind() +* pci_epf_unbind() pci_epf_unbind() should be invoked when the binding between EPC device and EPF device is lost. diff --git a/Documentation/PCI/endpoint/pci-test-function.txt b/Documentation/PCI/endpoint/pci-test-function.rst index 5916f1f592bb..3c8521d7aa31 100644 --- a/Documentation/PCI/endpoint/pci-test-function.txt +++ b/Documentation/PCI/endpoint/pci-test-function.rst @@ -1,5 +1,10 @@ - PCI TEST - Kishon Vijay Abraham I <kishon@ti.com> +.. SPDX-License-Identifier: GPL-2.0 + +================= +PCI Test Function +================= + +:Author: Kishon Vijay Abraham I <kishon@ti.com> Traditionally PCI RC has always been validated by using standard PCI cards like ethernet PCI cards or USB PCI cards or SATA PCI cards. @@ -23,65 +28,76 @@ The PCI endpoint test device has the following registers: 8) PCI_ENDPOINT_TEST_IRQ_TYPE 9) PCI_ENDPOINT_TEST_IRQ_NUMBER -*) PCI_ENDPOINT_TEST_MAGIC +* PCI_ENDPOINT_TEST_MAGIC This register will be used to test BAR0. A known pattern will be written and read back from MAGIC register to verify BAR0. -*) PCI_ENDPOINT_TEST_COMMAND: +* PCI_ENDPOINT_TEST_COMMAND This register will be used by the host driver to indicate the function that the endpoint device must perform. -Bitfield Description: - Bit 0 : raise legacy IRQ - Bit 1 : raise MSI IRQ - Bit 2 : raise MSI-X IRQ - Bit 3 : read command (read data from RC buffer) - Bit 4 : write command (write data to RC buffer) - Bit 5 : copy command (copy data from one RC buffer to another - RC buffer) +======== ================================================================ +Bitfield Description +======== ================================================================ +Bit 0 raise legacy IRQ +Bit 1 raise MSI IRQ +Bit 2 raise MSI-X IRQ +Bit 3 read command (read data from RC buffer) +Bit 4 write command (write data to RC buffer) +Bit 5 copy command (copy data from one RC buffer to another RC buffer) +======== ================================================================ -*) PCI_ENDPOINT_TEST_STATUS +* PCI_ENDPOINT_TEST_STATUS This register reflects the status of the PCI endpoint device. -Bitfield Description: - Bit 0 : read success - Bit 1 : read fail - Bit 2 : write success - Bit 3 : write fail - Bit 4 : copy success - Bit 5 : copy fail - Bit 6 : IRQ raised - Bit 7 : source address is invalid - Bit 8 : destination address is invalid - -*) PCI_ENDPOINT_TEST_SRC_ADDR +======== ============================== +Bitfield Description +======== ============================== +Bit 0 read success +Bit 1 read fail +Bit 2 write success +Bit 3 write fail +Bit 4 copy success +Bit 5 copy fail +Bit 6 IRQ raised +Bit 7 source address is invalid +Bit 8 destination address is invalid +======== ============================== + +* PCI_ENDPOINT_TEST_SRC_ADDR This register contains the source address (RC buffer address) for the COPY/READ command. -*) PCI_ENDPOINT_TEST_DST_ADDR +* PCI_ENDPOINT_TEST_DST_ADDR This register contains the destination address (RC buffer address) for the COPY/WRITE command. -*) PCI_ENDPOINT_TEST_IRQ_TYPE +* PCI_ENDPOINT_TEST_IRQ_TYPE This register contains the interrupt type (Legacy/MSI) triggered for the READ/WRITE/COPY and raise IRQ (Legacy/MSI) commands. Possible types: - - Legacy : 0 - - MSI : 1 - - MSI-X : 2 -*) PCI_ENDPOINT_TEST_IRQ_NUMBER +====== == +Legacy 0 +MSI 1 +MSI-X 2 +====== == + +* PCI_ENDPOINT_TEST_IRQ_NUMBER This register contains the triggered ID interrupt. Admissible values: - - Legacy : 0 - - MSI : [1 .. 32] - - MSI-X : [1 .. 2048] + +====== =========== +Legacy 0 +MSI [1 .. 32] +MSI-X [1 .. 2048] +====== =========== diff --git a/Documentation/PCI/endpoint/pci-test-howto.txt b/Documentation/PCI/endpoint/pci-test-howto.rst index 040479f437a5..909f770a07d6 100644 --- a/Documentation/PCI/endpoint/pci-test-howto.txt +++ b/Documentation/PCI/endpoint/pci-test-howto.rst @@ -1,38 +1,51 @@ - PCI TEST USERGUIDE - Kishon Vijay Abraham I <kishon@ti.com> +.. SPDX-License-Identifier: GPL-2.0 + +=================== +PCI Test User Guide +=================== + +:Author: Kishon Vijay Abraham I <kishon@ti.com> This document is a guide to help users use pci-epf-test function driver and pci_endpoint_test host driver for testing PCI. The list of steps to be followed in the host side and EP side is given below. -1. Endpoint Device +Endpoint Device +=============== -1.1 Endpoint Controller Devices +Endpoint Controller Devices +--------------------------- -To find the list of endpoint controller devices in the system: +To find the list of endpoint controller devices in the system:: # ls /sys/class/pci_epc/ 51000000.pcie_ep -If PCI_ENDPOINT_CONFIGFS is enabled +If PCI_ENDPOINT_CONFIGFS is enabled:: + # ls /sys/kernel/config/pci_ep/controllers 51000000.pcie_ep -1.2 Endpoint Function Drivers -To find the list of endpoint function drivers in the system: +Endpoint Function Drivers +------------------------- + +To find the list of endpoint function drivers in the system:: # ls /sys/bus/pci-epf/drivers pci_epf_test -If PCI_ENDPOINT_CONFIGFS is enabled +If PCI_ENDPOINT_CONFIGFS is enabled:: + # ls /sys/kernel/config/pci_ep/functions pci_epf_test -1.3 Creating pci-epf-test Device + +Creating pci-epf-test Device +---------------------------- PCI endpoint function device can be created using the configfs. To create -pci-epf-test device, the following commands can be used +pci-epf-test device, the following commands can be used:: # mount -t configfs none /sys/kernel/config # cd /sys/kernel/config/pci_ep/ @@ -42,7 +55,7 @@ The "mkdir func1" above creates the pci-epf-test function device that will be probed by pci_epf_test driver. The PCI endpoint framework populates the directory with the following -configurable fields. +configurable fields:: # ls functions/pci_epf_test/func1 baseclass_code interrupt_pin progif_code subsys_id @@ -51,67 +64,83 @@ configurable fields. The PCI endpoint function driver populates these entries with default values when the device is bound to the driver. The pci-epf-test driver populates -vendorid with 0xffff and interrupt_pin with 0x0001 +vendorid with 0xffff and interrupt_pin with 0x0001:: # cat functions/pci_epf_test/func1/vendorid 0xffff # cat functions/pci_epf_test/func1/interrupt_pin 0x0001 -1.4 Configuring pci-epf-test Device + +Configuring pci-epf-test Device +------------------------------- The user can configure the pci-epf-test device using configfs entry. In order to change the vendorid and the number of MSI interrupts used by the function -device, the following commands can be used. +device, the following commands can be used:: # echo 0x104c > functions/pci_epf_test/func1/vendorid # echo 0xb500 > functions/pci_epf_test/func1/deviceid # echo 16 > functions/pci_epf_test/func1/msi_interrupts # echo 8 > functions/pci_epf_test/func1/msix_interrupts -1.5 Binding pci-epf-test Device to EP Controller + +Binding pci-epf-test Device to EP Controller +-------------------------------------------- In order for the endpoint function device to be useful, it has to be bound to a PCI endpoint controller driver. Use the configfs to bind the function -device to one of the controller driver present in the system. +device to one of the controller driver present in the system:: # ln -s functions/pci_epf_test/func1 controllers/51000000.pcie_ep/ Once the above step is completed, the PCI endpoint is ready to establish a link with the host. -1.6 Start the Link + +Start the Link +-------------- In order for the endpoint device to establish a link with the host, the _start_ -field should be populated with '1'. +field should be populated with '1':: # echo 1 > controllers/51000000.pcie_ep/start -2. RootComplex Device -2.1 lspci Output +RootComplex Device +================== + +lspci Output +------------ -Note that the devices listed here correspond to the value populated in 1.4 above +Note that the devices listed here correspond to the value populated in 1.4 +above:: 00:00.0 PCI bridge: Texas Instruments Device 8888 (rev 01) 01:00.0 Unassigned class [ff00]: Texas Instruments Device b500 -2.2 Using Endpoint Test function Device + +Using Endpoint Test function Device +----------------------------------- pcitest.sh added in tools/pci/ can be used to run all the default PCI endpoint -tests. To compile this tool the following commands should be used: +tests. To compile this tool the following commands should be used:: # cd <kernel-dir> # make -C tools/pci -or if you desire to compile and install in your system: +or if you desire to compile and install in your system:: # cd <kernel-dir> # make -C tools/pci install The tool and script will be located in <rootfs>/usr/bin/ -2.2.1 pcitest.sh Output + +pcitest.sh Output +~~~~~~~~~~~~~~~~~ +:: + # pcitest.sh BAR tests diff --git a/Documentation/PCI/index.rst b/Documentation/PCI/index.rst new file mode 100644 index 000000000000..f4c6121868c3 --- /dev/null +++ b/Documentation/PCI/index.rst @@ -0,0 +1,18 @@ +.. SPDX-License-Identifier: GPL-2.0 + +======================= +Linux PCI Bus Subsystem +======================= + +.. toctree:: + :maxdepth: 2 + :numbered: + + pci + picebus-howto + pci-iov-howto + msi-howto + acpi-info + pci-error-recovery + pcieaer-howto + endpoint/index diff --git a/Documentation/PCI/MSI-HOWTO.txt b/Documentation/PCI/msi-howto.rst index 618e13d5e276..994cbb660ade 100644 --- a/Documentation/PCI/MSI-HOWTO.txt +++ b/Documentation/PCI/msi-howto.rst @@ -1,13 +1,16 @@ - The MSI Driver Guide HOWTO - Tom L Nguyen tom.l.nguyen@intel.com - 10/03/2003 - Revised Feb 12, 2004 by Martine Silbermann - email: Martine.Silbermann@hp.com - Revised Jun 25, 2004 by Tom L Nguyen - Revised Jul 9, 2008 by Matthew Wilcox <willy@linux.intel.com> - Copyright 2003, 2008 Intel Corporation +.. SPDX-License-Identifier: GPL-2.0 +.. include:: <isonum.txt> -1. About this guide +========================== +The MSI Driver Guide HOWTO +========================== + +:Authors: Tom L Nguyen; Martine Silbermann; Matthew Wilcox + +:Copyright: 2003, 2008 Intel Corporation + +About this guide +================ This guide describes the basics of Message Signaled Interrupts (MSIs), the advantages of using MSI over traditional interrupt mechanisms, how @@ -15,7 +18,8 @@ to change your driver to use MSI or MSI-X and some basic diagnostics to try if a device doesn't support MSIs. -2. What are MSIs? +What are MSIs? +============== A Message Signaled Interrupt is a write from the device to a special address which causes an interrupt to be received by the CPU. @@ -29,7 +33,8 @@ Devices may support both MSI and MSI-X, but only one can be enabled at a time. -3. Why use MSIs? +Why use MSIs? +============= There are three reasons why using MSIs can give an advantage over traditional pin-based interrupts. @@ -61,14 +66,16 @@ Other possible designs include giving one interrupt to each packet queue in a network card or each port in a storage controller. -4. How to use MSIs +How to use MSIs +=============== PCI devices are initialised to use pin-based interrupts. The device driver has to set up the device to use MSI or MSI-X. Not all machines support MSIs correctly, and for those machines, the APIs described below will simply fail and the device will continue to use pin-based interrupts. -4.1 Include kernel support for MSIs +Include kernel support for MSIs +------------------------------- To support MSI or MSI-X, the kernel must be built with the CONFIG_PCI_MSI option enabled. This option is only available on some architectures, @@ -76,14 +83,15 @@ and it may depend on some other options also being set. For example, on x86, you must also enable X86_UP_APIC or SMP in order to see the CONFIG_PCI_MSI option. -4.2 Using MSI +Using MSI +--------- Most of the hard work is done for the driver in the PCI layer. The driver simply has to request that the PCI layer set up the MSI capability for this device. To automatically use MSI or MSI-X interrupt vectors, use the following -function: +function:: int pci_alloc_irq_vectors(struct pci_dev *dev, unsigned int min_vecs, unsigned int max_vecs, unsigned int flags); @@ -101,12 +109,12 @@ any possible kind of interrupt. If the PCI_IRQ_AFFINITY flag is set, pci_alloc_irq_vectors() will spread the interrupts around the available CPUs. To get the Linux IRQ numbers passed to request_irq() and free_irq() and the -vectors, use the following function: +vectors, use the following function:: int pci_irq_vector(struct pci_dev *dev, unsigned int nr); Any allocated resources should be freed before removing the device using -the following function: +the following function:: void pci_free_irq_vectors(struct pci_dev *dev); @@ -126,7 +134,7 @@ The typical usage of MSI or MSI-X interrupts is to allocate as many vectors as possible, likely up to the limit supported by the device. If nvec is larger than the number supported by the device it will automatically be capped to the supported limit, so there is no need to query the number of -vectors supported beforehand: +vectors supported beforehand:: nvec = pci_alloc_irq_vectors(pdev, 1, nvec, PCI_IRQ_ALL_TYPES) if (nvec < 0) @@ -135,7 +143,7 @@ vectors supported beforehand: If a driver is unable or unwilling to deal with a variable number of MSI interrupts it can request a particular number of interrupts by passing that number to pci_alloc_irq_vectors() function as both 'min_vecs' and -'max_vecs' parameters: +'max_vecs' parameters:: ret = pci_alloc_irq_vectors(pdev, nvec, nvec, PCI_IRQ_ALL_TYPES); if (ret < 0) @@ -143,23 +151,24 @@ number to pci_alloc_irq_vectors() function as both 'min_vecs' and The most notorious example of the request type described above is enabling the single MSI mode for a device. It could be done by passing two 1s as -'min_vecs' and 'max_vecs': +'min_vecs' and 'max_vecs':: ret = pci_alloc_irq_vectors(pdev, 1, 1, PCI_IRQ_ALL_TYPES); if (ret < 0) goto out_err; Some devices might not support using legacy line interrupts, in which case -the driver can specify that only MSI or MSI-X is acceptable: +the driver can specify that only MSI or MSI-X is acceptable:: nvec = pci_alloc_irq_vectors(pdev, 1, nvec, PCI_IRQ_MSI | PCI_IRQ_MSIX); if (nvec < 0) goto out_err; -4.3 Legacy APIs +Legacy APIs +----------- The following old APIs to enable and disable MSI or MSI-X interrupts should -not be used in new code: +not be used in new code:: pci_enable_msi() /* deprecated */ pci_disable_msi() /* deprecated */ @@ -174,9 +183,11 @@ number of vectors. If you have a legitimate special use case for the count of vectors we might have to revisit that decision and add a pci_nr_irq_vectors() helper that handles MSI and MSI-X transparently. -4.4 Considerations when using MSIs +Considerations when using MSIs +------------------------------ -4.4.1 Spinlocks +Spinlocks +~~~~~~~~~ Most device drivers have a per-device spinlock which is taken in the interrupt handler. With pin-based interrupts or a single MSI, it is not @@ -188,7 +199,8 @@ acquire the spinlock. Such deadlocks can be avoided by using spin_lock_irqsave() or spin_lock_irq() which disable local interrupts and acquire the lock (see Documentation/kernel-hacking/locking.rst). -4.5 How to tell whether MSI/MSI-X is enabled on a device +How to tell whether MSI/MSI-X is enabled on a device +---------------------------------------------------- Using 'lspci -v' (as root) may show some devices with "MSI", "Message Signalled Interrupts" or "MSI-X" capabilities. Each of these capabilities @@ -196,7 +208,8 @@ has an 'Enable' flag which is followed with either "+" (enabled) or "-" (disabled). -5. MSI quirks +MSI quirks +========== Several PCI chipsets or devices are known not to support MSIs. The PCI stack provides three ways to disable MSIs: @@ -205,7 +218,8 @@ The PCI stack provides three ways to disable MSIs: 2. on all devices behind a specific bridge 3. on a single device -5.1. Disabling MSIs globally +Disabling MSIs globally +----------------------- Some host chipsets simply don't support MSIs properly. If we're lucky, the manufacturer knows this and has indicated it in the ACPI @@ -219,7 +233,8 @@ on the kernel command line to disable MSIs on all devices. It would be in your best interests to report the problem to linux-pci@vger.kernel.org including a full 'lspci -v' so we can add the quirks to the kernel. -5.2. Disabling MSIs below a bridge +Disabling MSIs below a bridge +----------------------------- Some PCI bridges are not able to route MSIs between busses properly. In this case, MSIs must be disabled on all devices behind the bridge. @@ -230,7 +245,7 @@ as the nVidia nForce and Serverworks HT2000). As with host chipsets, Linux mostly knows about them and automatically enables MSIs if it can. If you have a bridge unknown to Linux, you can enable MSIs in configuration space using whatever method you know works, then -enable MSIs on that bridge by doing: +enable MSIs on that bridge by doing:: echo 1 > /sys/bus/pci/devices/$bridge/msi_bus @@ -244,7 +259,8 @@ below this bridge. Again, please notify linux-pci@vger.kernel.org of any bridges that need special handling. -5.3. Disabling MSIs on a single device +Disabling MSIs on a single device +--------------------------------- Some devices are known to have faulty MSI implementations. Usually this is handled in the individual device driver, but occasionally it's necessary @@ -252,7 +268,8 @@ to handle this with a quirk. Some drivers have an option to disable use of MSI. While this is a convenient workaround for the driver author, it is not good practice, and should not be emulated. -5.4. Finding why MSIs are disabled on a device +Finding why MSIs are disabled on a device +----------------------------------------- From the above three sections, you can see that there are many reasons why MSIs may not be enabled for a given device. Your first step should @@ -260,8 +277,8 @@ be to examine your dmesg carefully to determine whether MSIs are enabled for your machine. You should also check your .config to be sure you have enabled CONFIG_PCI_MSI. -Then, 'lspci -t' gives the list of bridges above a device. Reading -/sys/bus/pci/devices/*/msi_bus will tell you whether MSIs are enabled (1) +Then, 'lspci -t' gives the list of bridges above a device. Reading +`/sys/bus/pci/devices/*/msi_bus` will tell you whether MSIs are enabled (1) or disabled (0). If 0 is found in any of the msi_bus files belonging to bridges between the PCI root and the device, MSIs are disabled. diff --git a/Documentation/PCI/pci-error-recovery.txt b/Documentation/PCI/pci-error-recovery.rst index 0b6bb3ef449e..83db42092935 100644 --- a/Documentation/PCI/pci-error-recovery.txt +++ b/Documentation/PCI/pci-error-recovery.rst @@ -1,12 +1,13 @@ +.. SPDX-License-Identifier: GPL-2.0 - PCI Error Recovery - ------------------ - February 2, 2006 +================== +PCI Error Recovery +================== - Current document maintainer: - Linas Vepstas <linasvepstas@gmail.com> - updated by Richard Lary <rlary@us.ibm.com> - and Mike Mason <mmlnx@us.ibm.com> on 27-Jul-2009 + +:Authors: - Linas Vepstas <linasvepstas@gmail.com> + - Richard Lary <rlary@us.ibm.com> + - Mike Mason <mmlnx@us.ibm.com> Many PCI bus controllers are able to detect a variety of hardware @@ -63,7 +64,8 @@ mechanisms for dealing with SCSI bus errors and SCSI bus resets. Detailed Design ---------------- +=============== + Design and implementation details below, based on a chain of public email discussions with Ben Herrenschmidt, circa 5 April 2005. @@ -73,30 +75,33 @@ pci_driver. A driver that fails to provide the structure is "non-aware", and the actual recovery steps taken are platform dependent. The arch/powerpc implementation will simulate a PCI hotplug remove/add. -This structure has the form: -struct pci_error_handlers -{ - int (*error_detected)(struct pci_dev *dev, enum pci_channel_state); - int (*mmio_enabled)(struct pci_dev *dev); - int (*slot_reset)(struct pci_dev *dev); - void (*resume)(struct pci_dev *dev); -}; - -The possible channel states are: -enum pci_channel_state { - pci_channel_io_normal, /* I/O channel is in normal state */ - pci_channel_io_frozen, /* I/O to channel is blocked */ - pci_channel_io_perm_failure, /* PCI card is dead */ -}; - -Possible return values are: -enum pci_ers_result { - PCI_ERS_RESULT_NONE, /* no result/none/not supported in device driver */ - PCI_ERS_RESULT_CAN_RECOVER, /* Device driver can recover without slot reset */ - PCI_ERS_RESULT_NEED_RESET, /* Device driver wants slot to be reset. */ - PCI_ERS_RESULT_DISCONNECT, /* Device has completely failed, is unrecoverable */ - PCI_ERS_RESULT_RECOVERED, /* Device driver is fully recovered and operational */ -}; +This structure has the form:: + + struct pci_error_handlers + { + int (*error_detected)(struct pci_dev *dev, enum pci_channel_state); + int (*mmio_enabled)(struct pci_dev *dev); + int (*slot_reset)(struct pci_dev *dev); + void (*resume)(struct pci_dev *dev); + }; + +The possible channel states are:: + + enum pci_channel_state { + pci_channel_io_normal, /* I/O channel is in normal state */ + pci_channel_io_frozen, /* I/O to channel is blocked */ + pci_channel_io_perm_failure, /* PCI card is dead */ + }; + +Possible return values are:: + + enum pci_ers_result { + PCI_ERS_RESULT_NONE, /* no result/none/not supported in device driver */ + PCI_ERS_RESULT_CAN_RECOVER, /* Device driver can recover without slot reset */ + PCI_ERS_RESULT_NEED_RESET, /* Device driver wants slot to be reset. */ + PCI_ERS_RESULT_DISCONNECT, /* Device has completely failed, is unrecoverable */ + PCI_ERS_RESULT_RECOVERED, /* Device driver is fully recovered and operational */ + }; A driver does not have to implement all of these callbacks; however, if it implements any, it must implement error_detected(). If a callback @@ -134,16 +139,17 @@ shouldn't do any new IOs. Called in task context. This is sort of a All drivers participating in this system must implement this call. The driver must return one of the following result codes: - - PCI_ERS_RESULT_CAN_RECOVER: - Driver returns this if it thinks it might be able to recover - the HW by just banging IOs or if it wants to be given - a chance to extract some diagnostic information (see - mmio_enable, below). - - PCI_ERS_RESULT_NEED_RESET: - Driver returns this if it can't recover without a - slot reset. - - PCI_ERS_RESULT_DISCONNECT: - Driver returns this if it doesn't want to recover at all. + + - PCI_ERS_RESULT_CAN_RECOVER + Driver returns this if it thinks it might be able to recover + the HW by just banging IOs or if it wants to be given + a chance to extract some diagnostic information (see + mmio_enable, below). + - PCI_ERS_RESULT_NEED_RESET + Driver returns this if it can't recover without a + slot reset. + - PCI_ERS_RESULT_DISCONNECT + Driver returns this if it doesn't want to recover at all. The next step taken will depend on the result codes returned by the drivers. @@ -159,25 +165,27 @@ then recovery proceeds to STEP 4 (Slot Reset). If the platform is unable to recover the slot, the next step is STEP 6 (Permanent Failure). ->>> The current powerpc implementation assumes that a device driver will ->>> *not* schedule or semaphore in this routine; the current powerpc ->>> implementation uses one kernel thread to notify all devices; ->>> thus, if one device sleeps/schedules, all devices are affected. ->>> Doing better requires complex multi-threaded logic in the error ->>> recovery implementation (e.g. waiting for all notification threads ->>> to "join" before proceeding with recovery.) This seems excessively ->>> complex and not worth implementing. - ->>> The current powerpc implementation doesn't much care if the device ->>> attempts I/O at this point, or not. I/O's will fail, returning ->>> a value of 0xff on read, and writes will be dropped. If more than ->>> EEH_MAX_FAILS I/O's are attempted to a frozen adapter, EEH ->>> assumes that the device driver has gone into an infinite loop ->>> and prints an error to syslog. A reboot is then required to ->>> get the device working again. +.. note:: + + The current powerpc implementation assumes that a device driver will + *not* schedule or semaphore in this routine; the current powerpc + implementation uses one kernel thread to notify all devices; + thus, if one device sleeps/schedules, all devices are affected. + Doing better requires complex multi-threaded logic in the error + recovery implementation (e.g. waiting for all notification threads + to "join" before proceeding with recovery.) This seems excessively + complex and not worth implementing. + + The current powerpc implementation doesn't much care if the device + attempts I/O at this point, or not. I/O's will fail, returning + a value of 0xff on read, and writes will be dropped. If more than + EEH_MAX_FAILS I/O's are attempted to a frozen adapter, EEH + assumes that the device driver has gone into an infinite loop + and prints an error to syslog. A reboot is then required to + get the device working again. STEP 2: MMIO Enabled -------------------- +-------------------- The platform re-enables MMIO to the device (but typically not the DMA), and then calls the mmio_enabled() callback on all affected device drivers. @@ -192,34 +200,36 @@ link reset was performed by the HW. If the platform can't just re-enable IOs without a slot reset or a link reset, it will not call this callback, and instead will have gone directly to STEP 3 (Link Reset) or STEP 4 (Slot Reset) ->>> The following is proposed; no platform implements this yet: ->>> Proposal: All I/O's should be done _synchronously_ from within ->>> this callback, errors triggered by them will be returned via ->>> the normal pci_check_whatever() API, no new error_detected() ->>> callback will be issued due to an error happening here. However, ->>> such an error might cause IOs to be re-blocked for the whole ->>> segment, and thus invalidate the recovery that other devices ->>> on the same segment might have done, forcing the whole segment ->>> into one of the next states, that is, link reset or slot reset. +.. note:: + + The following is proposed; no platform implements this yet: + Proposal: All I/O's should be done _synchronously_ from within + this callback, errors triggered by them will be returned via + the normal pci_check_whatever() API, no new error_detected() + callback will be issued due to an error happening here. However, + such an error might cause IOs to be re-blocked for the whole + segment, and thus invalidate the recovery that other devices + on the same segment might have done, forcing the whole segment + into one of the next states, that is, link reset or slot reset. The driver should return one of the following result codes: - - PCI_ERS_RESULT_RECOVERED - Driver returns this if it thinks the device is fully - functional and thinks it is ready to start - normal driver operations again. There is no - guarantee that the driver will actually be - allowed to proceed, as another driver on the - same segment might have failed and thus triggered a - slot reset on platforms that support it. - - - PCI_ERS_RESULT_NEED_RESET - Driver returns this if it thinks the device is not - recoverable in its current state and it needs a slot - reset to proceed. - - - PCI_ERS_RESULT_DISCONNECT - Same as above. Total failure, no recovery even after - reset driver dead. (To be defined more precisely) + - PCI_ERS_RESULT_RECOVERED + Driver returns this if it thinks the device is fully + functional and thinks it is ready to start + normal driver operations again. There is no + guarantee that the driver will actually be + allowed to proceed, as another driver on the + same segment might have failed and thus triggered a + slot reset on platforms that support it. + + - PCI_ERS_RESULT_NEED_RESET + Driver returns this if it thinks the device is not + recoverable in its current state and it needs a slot + reset to proceed. + + - PCI_ERS_RESULT_DISCONNECT + Same as above. Total failure, no recovery even after + reset driver dead. (To be defined more precisely) The next step taken depends on the results returned by the drivers. If all drivers returned PCI_ERS_RESULT_RECOVERED, then the platform @@ -293,31 +303,33 @@ device will be considered "dead" in this case. Drivers for multi-function cards will need to coordinate among themselves as to which driver instance will perform any "one-shot" or global device initialization. For example, the Symbios sym53cxx2 -driver performs device init only from PCI function 0: +driver performs device init only from PCI function 0:: -+ if (PCI_FUNC(pdev->devfn) == 0) -+ sym_reset_scsi_bus(np, 0); + + if (PCI_FUNC(pdev->devfn) == 0) + + sym_reset_scsi_bus(np, 0); - Result codes: - - PCI_ERS_RESULT_DISCONNECT - Same as above. +Result codes: + - PCI_ERS_RESULT_DISCONNECT + Same as above. Drivers for PCI Express cards that require a fundamental reset must set the needs_freset bit in the pci_dev structure in their probe function. For example, the QLogic qla2xxx driver sets the needs_freset bit for certain -PCI card types: +PCI card types:: -+ /* Set EEH reset type to fundamental if required by hba */ -+ if (IS_QLA24XX(ha) || IS_QLA25XX(ha) || IS_QLA81XX(ha)) -+ pdev->needs_freset = 1; -+ + + /* Set EEH reset type to fundamental if required by hba */ + + if (IS_QLA24XX(ha) || IS_QLA25XX(ha) || IS_QLA81XX(ha)) + + pdev->needs_freset = 1; + + Platform proceeds either to STEP 5 (Resume Operations) or STEP 6 (Permanent Failure). ->>> The current powerpc implementation does not try a power-cycle ->>> reset if the driver returned PCI_ERS_RESULT_DISCONNECT. ->>> However, it probably should. +.. note:: + + The current powerpc implementation does not try a power-cycle + reset if the driver returned PCI_ERS_RESULT_DISCONNECT. + However, it probably should. STEP 5: Resume Operations @@ -370,44 +382,43 @@ The current policy is to turn this into a platform policy. That is, the recovery API only requires that: - There is no guarantee that interrupt delivery can proceed from any -device on the segment starting from the error detection and until the -slot_reset callback is called, at which point interrupts are expected -to be fully operational. + device on the segment starting from the error detection and until the + slot_reset callback is called, at which point interrupts are expected + to be fully operational. - There is no guarantee that interrupt delivery is stopped, that is, -a driver that gets an interrupt after detecting an error, or that detects -an error within the interrupt handler such that it prevents proper -ack'ing of the interrupt (and thus removal of the source) should just -return IRQ_NOTHANDLED. It's up to the platform to deal with that -condition, typically by masking the IRQ source during the duration of -the error handling. It is expected that the platform "knows" which -interrupts are routed to error-management capable slots and can deal -with temporarily disabling that IRQ number during error processing (this -isn't terribly complex). That means some IRQ latency for other devices -sharing the interrupt, but there is simply no other way. High end -platforms aren't supposed to share interrupts between many devices -anyway :) - ->>> Implementation details for the powerpc platform are discussed in ->>> the file Documentation/powerpc/eeh-pci-error-recovery.txt - ->>> As of this writing, there is a growing list of device drivers with ->>> patches implementing error recovery. Not all of these patches are in ->>> mainline yet. These may be used as "examples": ->>> ->>> drivers/scsi/ipr ->>> drivers/scsi/sym53c8xx_2 ->>> drivers/scsi/qla2xxx ->>> drivers/scsi/lpfc ->>> drivers/next/bnx2.c ->>> drivers/next/e100.c ->>> drivers/net/e1000 ->>> drivers/net/e1000e ->>> drivers/net/ixgb ->>> drivers/net/ixgbe ->>> drivers/net/cxgb3 ->>> drivers/net/s2io.c ->>> drivers/net/qlge - -The End -------- + a driver that gets an interrupt after detecting an error, or that detects + an error within the interrupt handler such that it prevents proper + ack'ing of the interrupt (and thus removal of the source) should just + return IRQ_NOTHANDLED. It's up to the platform to deal with that + condition, typically by masking the IRQ source during the duration of + the error handling. It is expected that the platform "knows" which + interrupts are routed to error-management capable slots and can deal + with temporarily disabling that IRQ number during error processing (this + isn't terribly complex). That means some IRQ latency for other devices + sharing the interrupt, but there is simply no other way. High end + platforms aren't supposed to share interrupts between many devices + anyway :) + +.. note:: + + Implementation details for the powerpc platform are discussed in + the file Documentation/powerpc/eeh-pci-error-recovery.txt + + As of this writing, there is a growing list of device drivers with + patches implementing error recovery. Not all of these patches are in + mainline yet. These may be used as "examples": + + - drivers/scsi/ipr + - drivers/scsi/sym53c8xx_2 + - drivers/scsi/qla2xxx + - drivers/scsi/lpfc + - drivers/next/bnx2.c + - drivers/next/e100.c + - drivers/net/e1000 + - drivers/net/e1000e + - drivers/net/ixgb + - drivers/net/ixgbe + - drivers/net/cxgb3 + - drivers/net/s2io.c + - drivers/net/qlge diff --git a/Documentation/PCI/pci-iov-howto.txt b/Documentation/PCI/pci-iov-howto.rst index d2a84151e99c..b9fd003206f1 100644 --- a/Documentation/PCI/pci-iov-howto.txt +++ b/Documentation/PCI/pci-iov-howto.rst @@ -1,14 +1,19 @@ - PCI Express I/O Virtualization Howto - Copyright (C) 2009 Intel Corporation - Yu Zhao <yu.zhao@intel.com> +.. SPDX-License-Identifier: GPL-2.0 +.. include:: <isonum.txt> - Update: November 2012 - -- sysfs-based SRIOV enable-/disable-ment - Donald Dutile <ddutile@redhat.com> +==================================== +PCI Express I/O Virtualization Howto +==================================== -1. Overview +:Copyright: |copy| 2009 Intel Corporation +:Authors: - Yu Zhao <yu.zhao@intel.com> + - Donald Dutile <ddutile@redhat.com> -1.1 What is SR-IOV +Overview +======== + +What is SR-IOV +-------------- Single Root I/O Virtualization (SR-IOV) is a PCI Express Extended capability which makes one physical device appear as multiple virtual @@ -23,9 +28,11 @@ Memory Space, which is used to map its register set. VF device driver operates on the register set so it can be functional and appear as a real existing PCI device. -2. User Guide +User Guide +========== -2.1 How can I enable SR-IOV capability +How can I enable SR-IOV capability +---------------------------------- Multiple methods are available for SR-IOV enablement. In the first method, the device driver (PF driver) will control the @@ -43,105 +50,123 @@ checks, e.g., check numvfs == 0 if enabling VFs, ensure numvfs <= totalvfs. The second method is the recommended method for new/future VF devices. -2.2 How can I use the Virtual Functions +How can I use the Virtual Functions +----------------------------------- The VF is treated as hot-plugged PCI devices in the kernel, so they should be able to work in the same way as real PCI devices. The VF requires device driver that is same as a normal PCI device's. -3. Developer Guide +Developer Guide +=============== -3.1 SR-IOV API +SR-IOV API +---------- To enable SR-IOV capability: -(a) For the first method, in the driver: + +(a) For the first method, in the driver:: + int pci_enable_sriov(struct pci_dev *dev, int nr_virtfn); - 'nr_virtfn' is number of VFs to be enabled. -(b) For the second method, from sysfs: + +'nr_virtfn' is number of VFs to be enabled. + +(b) For the second method, from sysfs:: + echo 'nr_virtfn' > \ /sys/bus/pci/devices/<DOMAIN:BUS:DEVICE.FUNCTION>/sriov_numvfs To disable SR-IOV capability: -(a) For the first method, in the driver: + +(a) For the first method, in the driver:: + void pci_disable_sriov(struct pci_dev *dev); -(b) For the second method, from sysfs: + +(b) For the second method, from sysfs:: + echo 0 > \ /sys/bus/pci/devices/<DOMAIN:BUS:DEVICE.FUNCTION>/sriov_numvfs To enable auto probing VFs by a compatible driver on the host, run command below before enabling SR-IOV capabilities. This is the default behavior. +:: + echo 1 > \ /sys/bus/pci/devices/<DOMAIN:BUS:DEVICE.FUNCTION>/sriov_drivers_autoprobe To disable auto probing VFs by a compatible driver on the host, run command below before enabling SR-IOV capabilities. Updating this entry will not affect VFs which are already probed. +:: + echo 0 > \ /sys/bus/pci/devices/<DOMAIN:BUS:DEVICE.FUNCTION>/sriov_drivers_autoprobe -3.2 Usage example +Usage example +------------- Following piece of code illustrates the usage of the SR-IOV API. +:: -static int dev_probe(struct pci_dev *dev, const struct pci_device_id *id) -{ - pci_enable_sriov(dev, NR_VIRTFN); + static int dev_probe(struct pci_dev *dev, const struct pci_device_id *id) + { + pci_enable_sriov(dev, NR_VIRTFN); - ... - - return 0; -} + ... -static void dev_remove(struct pci_dev *dev) -{ - pci_disable_sriov(dev); + return 0; + } - ... -} + static void dev_remove(struct pci_dev *dev) + { + pci_disable_sriov(dev); -static int dev_suspend(struct pci_dev *dev, pm_message_t state) -{ - ... + ... + } - return 0; -} + static int dev_suspend(struct pci_dev *dev, pm_message_t state) + { + ... -static int dev_resume(struct pci_dev *dev) -{ - ... + return 0; + } - return 0; -} + static int dev_resume(struct pci_dev *dev) + { + ... -static void dev_shutdown(struct pci_dev *dev) -{ - ... -} + return 0; + } -static int dev_sriov_configure(struct pci_dev *dev, int numvfs) -{ - if (numvfs > 0) { - ... - pci_enable_sriov(dev, numvfs); + static void dev_shutdown(struct pci_dev *dev) + { ... - return numvfs; } - if (numvfs == 0) { - .... - pci_disable_sriov(dev); - ... - return 0; + + static int dev_sriov_configure(struct pci_dev *dev, int numvfs) + { + if (numvfs > 0) { + ... + pci_enable_sriov(dev, numvfs); + ... + return numvfs; + } + if (numvfs == 0) { + .... + pci_disable_sriov(dev); + ... + return 0; + } } -} - -static struct pci_driver dev_driver = { - .name = "SR-IOV Physical Function driver", - .id_table = dev_id_table, - .probe = dev_probe, - .remove = dev_remove, - .suspend = dev_suspend, - .resume = dev_resume, - .shutdown = dev_shutdown, - .sriov_configure = dev_sriov_configure, -}; + + static struct pci_driver dev_driver = { + .name = "SR-IOV Physical Function driver", + .id_table = dev_id_table, + .probe = dev_probe, + .remove = dev_remove, + .suspend = dev_suspend, + .resume = dev_resume, + .shutdown = dev_shutdown, + .sriov_configure = dev_sriov_configure, + }; diff --git a/Documentation/PCI/pci.txt b/Documentation/PCI/pci.rst index badb26ac33dc..6864f9a70f5f 100644 --- a/Documentation/PCI/pci.txt +++ b/Documentation/PCI/pci.rst @@ -1,10 +1,12 @@ +.. SPDX-License-Identifier: GPL-2.0 - How To Write Linux PCI Drivers +============================== +How To Write Linux PCI Drivers +============================== - by Martin Mares <mj@ucw.cz> on 07-Feb-2000 - updated by Grant Grundler <grundler@parisc-linux.org> on 23-Dec-2006 +:Authors: - Martin Mares <mj@ucw.cz> + - Grant Grundler <grundler@parisc-linux.org> -~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ The world of PCI is vast and full of (mostly unpleasant) surprises. Since each CPU architecture implements different chip-sets and PCI devices have different requirements (erm, "features"), the result is the PCI support @@ -15,8 +17,7 @@ PCI device drivers. A more complete resource is the third edition of "Linux Device Drivers" by Jonathan Corbet, Alessandro Rubini, and Greg Kroah-Hartman. LDD3 is available for free (under Creative Commons License) from: - - http://lwn.net/Kernel/LDD3/ +http://lwn.net/Kernel/LDD3/. However, keep in mind that all documents are subject to "bit rot". Refer to the source code if things are not working as described here. @@ -25,9 +26,8 @@ Please send questions/comments/patches about Linux PCI API to the "Linux PCI" <linux-pci@atrey.karlin.mff.cuni.cz> mailing list. - -0. Structure of PCI drivers -~~~~~~~~~~~~~~~~~~~~~~~~~~~ +Structure of PCI drivers +======================== PCI drivers "discover" PCI devices in a system via pci_register_driver(). Actually, it's the other way around. When the PCI generic code discovers a new device, the driver with a matching "description" will be notified. @@ -42,24 +42,25 @@ pointers and thus dictates the high level structure of a driver. Once the driver knows about a PCI device and takes ownership, the driver generally needs to perform the following initialization: - Enable the device - Request MMIO/IOP resources - Set the DMA mask size (for both coherent and streaming DMA) - Allocate and initialize shared control data (pci_allocate_coherent()) - Access device configuration space (if needed) - Register IRQ handler (request_irq()) - Initialize non-PCI (i.e. LAN/SCSI/etc parts of the chip) - Enable DMA/processing engines + - Enable the device + - Request MMIO/IOP resources + - Set the DMA mask size (for both coherent and streaming DMA) + - Allocate and initialize shared control data (pci_allocate_coherent()) + - Access device configuration space (if needed) + - Register IRQ handler (request_irq()) + - Initialize non-PCI (i.e. LAN/SCSI/etc parts of the chip) + - Enable DMA/processing engines When done using the device, and perhaps the module needs to be unloaded, the driver needs to take the follow steps: - Disable the device from generating IRQs - Release the IRQ (free_irq()) - Stop all DMA activity - Release DMA buffers (both streaming and coherent) - Unregister from other subsystems (e.g. scsi or netdev) - Release MMIO/IOP resources - Disable the device + + - Disable the device from generating IRQs + - Release the IRQ (free_irq()) + - Stop all DMA activity + - Release DMA buffers (both streaming and coherent) + - Unregister from other subsystems (e.g. scsi or netdev) + - Release MMIO/IOP resources + - Disable the device Most of these topics are covered in the following sections. For the rest look at LDD3 or <linux/pci.h> . @@ -70,99 +71,38 @@ completely empty or just returning an appropriate error codes to avoid lots of ifdefs in the drivers. +pci_register_driver() call +========================== -1. pci_register_driver() call -~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ - -PCI device drivers call pci_register_driver() during their +PCI device drivers call ``pci_register_driver()`` during their initialization with a pointer to a structure describing the driver -(struct pci_driver): - - field name Description - ---------- ------------------------------------------------------ - id_table Pointer to table of device ID's the driver is - interested in. Most drivers should export this - table using MODULE_DEVICE_TABLE(pci,...). - - probe This probing function gets called (during execution - of pci_register_driver() for already existing - devices or later if a new device gets inserted) for - all PCI devices which match the ID table and are not - "owned" by the other drivers yet. This function gets - passed a "struct pci_dev *" for each device whose - entry in the ID table matches the device. The probe - function returns zero when the driver chooses to - take "ownership" of the device or an error code - (negative number) otherwise. - The probe function always gets called from process - context, so it can sleep. - - remove The remove() function gets called whenever a device - being handled by this driver is removed (either during - deregistration of the driver or when it's manually - pulled out of a hot-pluggable slot). - The remove function always gets called from process - context, so it can sleep. - - suspend Put device into low power state. - suspend_late Put device into low power state. - - resume_early Wake device from low power state. - resume Wake device from low power state. - - (Please see Documentation/power/pci.txt for descriptions - of PCI Power Management and the related functions.) - - shutdown Hook into reboot_notifier_list (kernel/sys.c). - Intended to stop any idling DMA operations. - Useful for enabling wake-on-lan (NIC) or changing - the power state of a device before reboot. - e.g. drivers/net/e100.c. - - err_handler See Documentation/PCI/pci-error-recovery.txt - - -The ID table is an array of struct pci_device_id entries ending with an -all-zero entry. Definitions with static const are generally preferred. - -Each entry consists of: - - vendor,device Vendor and device ID to match (or PCI_ANY_ID) +(``struct pci_driver``): - subvendor, Subsystem vendor and device ID to match (or PCI_ANY_ID) - subdevice, +.. kernel-doc:: include/linux/pci.h + :functions: pci_driver - class Device class, subclass, and "interface" to match. - See Appendix D of the PCI Local Bus Spec or - include/linux/pci_ids.h for a full list of classes. - Most drivers do not need to specify class/class_mask - as vendor/device is normally sufficient. - - class_mask limit which sub-fields of the class field are compared. - See drivers/scsi/sym53c8xx_2/ for example of usage. - - driver_data Data private to the driver. - Most drivers don't need to use driver_data field. - Best practice is to use driver_data as an index - into a static list of equivalent device types, - instead of using it as a pointer. +The ID table is an array of ``struct pci_device_id`` entries ending with an +all-zero entry. Definitions with static const are generally preferred. +.. kernel-doc:: include/linux/mod_devicetable.h + :functions: pci_device_id -Most drivers only need PCI_DEVICE() or PCI_DEVICE_CLASS() to set up +Most drivers only need ``PCI_DEVICE()`` or ``PCI_DEVICE_CLASS()`` to set up a pci_device_id table. New PCI IDs may be added to a device driver pci_ids table at runtime -as shown below: +as shown below:: -echo "vendor device subvendor subdevice class class_mask driver_data" > \ -/sys/bus/pci/drivers/{driver}/new_id + echo "vendor device subvendor subdevice class class_mask driver_data" > \ + /sys/bus/pci/drivers/{driver}/new_id All fields are passed in as hexadecimal values (no leading 0x). The vendor and device fields are mandatory, the others are optional. Users need pass only as many optional fields as necessary: - o subvendor and subdevice fields default to PCI_ANY_ID (FFFFFFFF) - o class and classmask fields default to 0 - o driver_data defaults to 0UL. + + - subvendor and subdevice fields default to PCI_ANY_ID (FFFFFFFF) + - class and classmask fields default to 0 + - driver_data defaults to 0UL. Note that driver_data must match the value used by any of the pci_device_id entries defined in the driver. This makes the driver_data field mandatory @@ -175,29 +115,31 @@ When the driver exits, it just calls pci_unregister_driver() and the PCI layer automatically calls the remove hook for all devices handled by the driver. -1.1 "Attributes" for driver functions/data +"Attributes" for driver functions/data +-------------------------------------- Please mark the initialization and cleanup functions where appropriate (the corresponding macros are defined in <linux/init.h>): + ====== ================================================= __init Initialization code. Thrown away after the driver initializes. __exit Exit code. Ignored for non-modular drivers. + ====== ================================================= Tips on when/where to use the above attributes: - o The module_init()/module_exit() functions (and all + - The module_init()/module_exit() functions (and all initialization functions called _only_ from these) should be marked __init/__exit. - o Do not mark the struct pci_driver. + - Do not mark the struct pci_driver. - o Do NOT mark a function if you are not sure which mark to use. + - Do NOT mark a function if you are not sure which mark to use. Better to not mark the function than mark the function wrong. - -2. How to find PCI devices manually -~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ +How to find PCI devices manually +================================ PCI drivers should have a really good reason for not using the pci_register_driver() interface to search for PCI devices. @@ -207,17 +149,17 @@ E.g. combined serial/parallel port/floppy controller. A manual search may be performed using the following constructs: -Searching by vendor and device ID: +Searching by vendor and device ID:: struct pci_dev *dev = NULL; while (dev = pci_get_device(VENDOR_ID, DEVICE_ID, dev)) configure_device(dev); -Searching by class ID (iterate in a similar way): +Searching by class ID (iterate in a similar way):: pci_get_class(CLASS_ID, dev) -Searching by both vendor/device and subsystem vendor/device ID: +Searching by both vendor/device and subsystem vendor/device ID:: pci_get_subsys(VENDOR_ID,DEVICE_ID, SUBSYS_VENDOR_ID, SUBSYS_DEVICE_ID, dev). @@ -230,21 +172,20 @@ the pci_dev that they return. You must eventually (possibly at module unload) decrement the reference count on these devices by calling pci_dev_put(). - -3. Device Initialization Steps -~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ +Device Initialization Steps +=========================== As noted in the introduction, most PCI drivers need the following steps for device initialization: - Enable the device - Request MMIO/IOP resources - Set the DMA mask size (for both coherent and streaming DMA) - Allocate and initialize shared control data (pci_allocate_coherent()) - Access device configuration space (if needed) - Register IRQ handler (request_irq()) - Initialize non-PCI (i.e. LAN/SCSI/etc parts of the chip) - Enable DMA/processing engines. + - Enable the device + - Request MMIO/IOP resources + - Set the DMA mask size (for both coherent and streaming DMA) + - Allocate and initialize shared control data (pci_allocate_coherent()) + - Access device configuration space (if needed) + - Register IRQ handler (request_irq()) + - Initialize non-PCI (i.e. LAN/SCSI/etc parts of the chip) + - Enable DMA/processing engines. The driver can access PCI config space registers at any time. (Well, almost. When running BIST, config space can go away...but @@ -252,26 +193,29 @@ that will just result in a PCI Bus Master Abort and config reads will return garbage). -3.1 Enable the PCI device -~~~~~~~~~~~~~~~~~~~~~~~~~ +Enable the PCI device +--------------------- Before touching any device registers, the driver needs to enable the PCI device by calling pci_enable_device(). This will: - o wake up the device if it was in suspended state, - o allocate I/O and memory regions of the device (if BIOS did not), - o allocate an IRQ (if BIOS did not). -NOTE: pci_enable_device() can fail! Check the return value. + - wake up the device if it was in suspended state, + - allocate I/O and memory regions of the device (if BIOS did not), + - allocate an IRQ (if BIOS did not). -[ OS BUG: we don't check resource allocations before enabling those - resources. The sequence would make more sense if we called - pci_request_resources() before calling pci_enable_device(). - Currently, the device drivers can't detect the bug when when two - devices have been allocated the same range. This is not a common - problem and unlikely to get fixed soon. +.. note:: + pci_enable_device() can fail! Check the return value. + +.. warning:: + OS BUG: we don't check resource allocations before enabling those + resources. The sequence would make more sense if we called + pci_request_resources() before calling pci_enable_device(). + Currently, the device drivers can't detect the bug when when two + devices have been allocated the same range. This is not a common + problem and unlikely to get fixed soon. + + This has been discussed before but not changed as of 2.6.19: + http://lkml.org/lkml/2006/3/2/194 - This has been discussed before but not changed as of 2.6.19: - http://lkml.org/lkml/2006/3/2/194 -] pci_set_master() will enable DMA by setting the bus master bit in the PCI_COMMAND register. It also fixes the latency timer value if @@ -288,8 +232,8 @@ pci_try_set_mwi() to have the system do its best effort at enabling Mem-Wr-Inval. -3.2 Request MMIO/IOP resources -~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ +Request MMIO/IOP resources +-------------------------- Memory (MMIO), and I/O port addresses should NOT be read directly from the PCI device config space. Use the values in the pci_dev structure as the PCI "bus address" might have been remapped to a "host physical" @@ -304,9 +248,10 @@ Conversely, drivers should call pci_release_region() AFTER calling pci_disable_device(). The idea is to prevent two devices colliding on the same address range. -[ See OS BUG comment above. Currently (2.6.19), The driver can only - determine MMIO and IO Port resource availability _after_ calling - pci_enable_device(). ] +.. tip:: + See OS BUG comment above. Currently (2.6.19), The driver can only + determine MMIO and IO Port resource availability _after_ calling + pci_enable_device(). Generic flavors of pci_request_region() are request_mem_region() (for MMIO ranges) and request_region() (for IO Port ranges). @@ -316,12 +261,13 @@ BARs. Also see pci_request_selected_regions() below. -3.3 Set the DMA mask size -~~~~~~~~~~~~~~~~~~~~~~~~~ -[ If anything below doesn't make sense, please refer to - Documentation/DMA-API.txt. This section is just a reminder that - drivers need to indicate DMA capabilities of the device and is not - an authoritative source for DMA interfaces. ] +Set the DMA mask size +--------------------- +.. note:: + If anything below doesn't make sense, please refer to + Documentation/DMA-API.txt. This section is just a reminder that + drivers need to indicate DMA capabilities of the device and is not + an authoritative source for DMA interfaces. While all drivers should explicitly indicate the DMA capability (e.g. 32 or 64 bit) of the PCI bus master, devices with more than @@ -342,23 +288,23 @@ Many 64-bit "PCI" devices (before PCI-X) and some PCI-X devices are ("consistent") data. -3.4 Setup shared control data -~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ +Setup shared control data +------------------------- Once the DMA masks are set, the driver can allocate "consistent" (a.k.a. shared) memory. See Documentation/DMA-API.txt for a full description of the DMA APIs. This section is just a reminder that it needs to be done before enabling DMA on the device. -3.5 Initialize device registers -~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ +Initialize device registers +--------------------------- Some drivers will need specific "capability" fields programmed or other "vendor specific" register initialized or reset. E.g. clearing pending interrupts. -3.6 Register IRQ handler -~~~~~~~~~~~~~~~~~~~~~~~~ +Register IRQ handler +-------------------- While calling request_irq() is the last step described here, this is often just another intermediate step to initialize a device. This step can often be deferred until the device is opened for use. @@ -396,6 +342,7 @@ and msix_enabled flags in the pci_dev structure after calling pci_alloc_irq_vectors. There are (at least) two really good reasons for using MSI: + 1) MSI is an exclusive interrupt vector by definition. This means the interrupt handler doesn't have to verify its device caused the interrupt. @@ -410,24 +357,23 @@ See drivers/infiniband/hw/mthca/ or drivers/net/tg3.c for examples of MSI/MSI-X usage. - -4. PCI device shutdown -~~~~~~~~~~~~~~~~~~~~~~~ +PCI device shutdown +=================== When a PCI device driver is being unloaded, most of the following steps need to be performed: - Disable the device from generating IRQs - Release the IRQ (free_irq()) - Stop all DMA activity - Release DMA buffers (both streaming and consistent) - Unregister from other subsystems (e.g. scsi or netdev) - Disable device from responding to MMIO/IO Port addresses - Release MMIO/IO Port resource(s) + - Disable the device from generating IRQs + - Release the IRQ (free_irq()) + - Stop all DMA activity + - Release DMA buffers (both streaming and consistent) + - Unregister from other subsystems (e.g. scsi or netdev) + - Disable device from responding to MMIO/IO Port addresses + - Release MMIO/IO Port resource(s) -4.1 Stop IRQs on the device -~~~~~~~~~~~~~~~~~~~~~~~~~~~ +Stop IRQs on the device +----------------------- How to do this is chip/device specific. If it's not done, it opens the possibility of a "screaming interrupt" if (and only if) the IRQ is shared with another device. @@ -446,16 +392,16 @@ MSI and MSI-X are defined to be exclusive interrupts and thus are not susceptible to the "screaming interrupt" problem. -4.2 Release the IRQ -~~~~~~~~~~~~~~~~~~~ +Release the IRQ +--------------- Once the device is quiesced (no more IRQs), one can call free_irq(). This function will return control once any pending IRQs are handled, "unhook" the drivers IRQ handler from that IRQ, and finally release the IRQ if no one else is using it. -4.3 Stop all DMA activity -~~~~~~~~~~~~~~~~~~~~~~~~~ +Stop all DMA activity +--------------------- It's extremely important to stop all DMA operations BEFORE attempting to deallocate DMA control data. Failure to do so can result in memory corruption, hangs, and on some chip-sets a hard crash. @@ -467,8 +413,8 @@ While this step sounds obvious and trivial, several "mature" drivers didn't get this step right in the past. -4.4 Release DMA buffers -~~~~~~~~~~~~~~~~~~~~~~~ +Release DMA buffers +------------------- Once DMA is stopped, clean up streaming DMA first. I.e. unmap data buffers and return buffers to "upstream" owners if there is one. @@ -478,8 +424,8 @@ Then clean up "consistent" buffers which contain the control data. See Documentation/DMA-API.txt for details on unmapping interfaces. -4.5 Unregister from other subsystems -~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ +Unregister from other subsystems +-------------------------------- Most low level PCI device drivers support some other subsystem like USB, ALSA, SCSI, NetDev, Infiniband, etc. Make sure your driver isn't losing resources from that other subsystem. @@ -487,31 +433,30 @@ If this happens, typically the symptom is an Oops (panic) when the subsystem attempts to call into a driver that has been unloaded. -4.6 Disable Device from responding to MMIO/IO Port addresses -~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ +Disable Device from responding to MMIO/IO Port addresses +-------------------------------------------------------- io_unmap() MMIO or IO Port resources and then call pci_disable_device(). This is the symmetric opposite of pci_enable_device(). Do not access device registers after calling pci_disable_device(). -4.7 Release MMIO/IO Port Resource(s) -~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ +Release MMIO/IO Port Resource(s) +-------------------------------- Call pci_release_region() to mark the MMIO or IO Port range as available. Failure to do so usually results in the inability to reload the driver. +How to access PCI config space +============================== -5. How to access PCI config space -~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ - -You can use pci_(read|write)_config_(byte|word|dword) to access the config -space of a device represented by struct pci_dev *. All these functions return 0 -when successful or an error code (PCIBIOS_...) which can be translated to a text -string by pcibios_strerror. Most drivers expect that accesses to valid PCI +You can use `pci_(read|write)_config_(byte|word|dword)` to access the config +space of a device represented by `struct pci_dev *`. All these functions return +0 when successful or an error code (`PCIBIOS_...`) which can be translated to a +text string by pcibios_strerror. Most drivers expect that accesses to valid PCI devices don't fail. If you don't have a struct pci_dev available, you can call -pci_bus_(read|write)_config_(byte|word|dword) to access a given device +`pci_bus_(read|write)_config_(byte|word|dword)` to access a given device and function on that bus. If you access fields in the standard portion of the config header, please @@ -522,10 +467,10 @@ pci_find_capability() for the particular capability and it will find the corresponding register block for you. +Other interesting functions +=========================== -6. Other interesting functions -~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ - +============================= ================================================ pci_get_domain_bus_and_slot() Find pci_dev corresponding to given domain, bus and slot and number. If the device is found, its reference count is increased. @@ -539,11 +484,11 @@ pci_set_drvdata() Set private driver data pointer for a pci_dev pci_get_drvdata() Return private driver data pointer for a pci_dev pci_set_mwi() Enable Memory-Write-Invalidate transactions. pci_clear_mwi() Disable Memory-Write-Invalidate transactions. +============================= ================================================ - -7. Miscellaneous hints -~~~~~~~~~~~~~~~~~~~~~~ +Miscellaneous hints +=================== When displaying PCI device names to the user (for example when a driver wants to tell the user what card has it found), please use pci_name(pci_dev). @@ -559,9 +504,8 @@ on the bus need to be capable of doing it, so this is something which needs to be handled by platform and generic code, not individual drivers. - -8. Vendor and device identifications -~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ +Vendor and device identifications +================================= Do not add new device or vendor IDs to include/linux/pci_ids.h unless they are shared across multiple drivers. You can add private definitions in @@ -575,28 +519,27 @@ There are mirrors of the pci.ids file at http://pciids.sourceforge.net/ and https://github.com/pciutils/pciids. - -9. Obsolete functions -~~~~~~~~~~~~~~~~~~~~~ +Obsolete functions +================== There are several functions which you might come across when trying to port an old driver to the new PCI interface. They are no longer present in the kernel as they aren't compatible with hotplug or PCI domains or having sane locking. +================= =========================================== pci_find_device() Superseded by pci_get_device() pci_find_subsys() Superseded by pci_get_subsys() pci_find_slot() Superseded by pci_get_domain_bus_and_slot() pci_get_slot() Superseded by pci_get_domain_bus_and_slot() - +================= =========================================== The alternative is the traditional PCI device driver that walks PCI device lists. This is still possible but discouraged. - -10. MMIO Space and "Write Posting" -~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ +MMIO Space and "Write Posting" +============================== Converting a driver from using I/O Port space to using MMIO space often requires some additional changes. Specifically, "write posting" @@ -609,14 +552,14 @@ the CPU before the transaction has reached its destination. Thus, timing sensitive code should add readl() where the CPU is expected to wait before doing other work. The classic "bit banging" -sequence works fine for I/O Port space: +sequence works fine for I/O Port space:: for (i = 8; --i; val >>= 1) { outb(val & 1, ioport_reg); /* write bit */ udelay(10); } -The same sequence for MMIO space should be: +The same sequence for MMIO space should be:: for (i = 8; --i; val >>= 1) { writeb(val & 1, mmio_reg); /* write bit */ @@ -633,4 +576,3 @@ handle the PCI master abort on all platforms if the PCI device is expected to not respond to a readl(). Most x86 platforms will allow MMIO reads to master abort (a.k.a. "Soft Fail") and return garbage (e.g. ~0). But many RISC platforms will crash (a.k.a."Hard Fail"). - diff --git a/Documentation/PCI/pcieaer-howto.txt b/Documentation/PCI/pcieaer-howto.rst index 48ce7903e3c6..18bdefaafd1a 100644 --- a/Documentation/PCI/pcieaer-howto.txt +++ b/Documentation/PCI/pcieaer-howto.rst @@ -1,21 +1,29 @@ - The PCI Express Advanced Error Reporting Driver Guide HOWTO - T. Long Nguyen <tom.l.nguyen@intel.com> - Yanmin Zhang <yanmin.zhang@intel.com> - 07/29/2006 +.. SPDX-License-Identifier: GPL-2.0 +.. include:: <isonum.txt> +=========================================================== +The PCI Express Advanced Error Reporting Driver Guide HOWTO +=========================================================== -1. Overview +:Authors: - T. Long Nguyen <tom.l.nguyen@intel.com> + - Yanmin Zhang <yanmin.zhang@intel.com> -1.1 About this guide +:Copyright: |copy| 2006 Intel Corporation + +Overview +=========== + +About this guide +---------------- This guide describes the basics of the PCI Express Advanced Error Reporting (AER) driver and provides information on how to use it, as well as how to enable the drivers of endpoint devices to conform with PCI Express AER driver. -1.2 Copyright (C) Intel Corporation 2006. -1.3 What is the PCI Express AER Driver? +What is the PCI Express AER Driver? +----------------------------------- PCI Express error signaling can occur on the PCI Express link itself or on behalf of transactions initiated on the link. PCI Express @@ -30,17 +38,19 @@ The PCI Express AER driver provides the infrastructure to support PCI Express Advanced Error Reporting capability. The PCI Express AER driver provides three basic functions: -- Gathers the comprehensive error information if errors occurred. -- Reports error to the users. -- Performs error recovery actions. + - Gathers the comprehensive error information if errors occurred. + - Reports error to the users. + - Performs error recovery actions. AER driver only attaches root ports which support PCI-Express AER capability. -2. User Guide +User Guide +========== -2.1 Include the PCI Express AER Root Driver into the Linux Kernel +Include the PCI Express AER Root Driver into the Linux Kernel +------------------------------------------------------------- The PCI Express AER Root driver is a Root Port service driver attached to the PCI Express Port Bus driver. If a user wants to use it, the driver @@ -48,7 +58,8 @@ has to be compiled. Option CONFIG_PCIEAER supports this capability. It depends on CONFIG_PCIEPORTBUS, so pls. set CONFIG_PCIEPORTBUS=y and CONFIG_PCIEAER = y. -2.2 Load PCI Express AER Root Driver +Load PCI Express AER Root Driver +-------------------------------- Some systems have AER support in firmware. Enabling Linux AER support at the same time the firmware handles AER may result in unpredictable @@ -56,30 +67,34 @@ behavior. Therefore, Linux does not handle AER events unless the firmware grants AER control to the OS via the ACPI _OSC method. See the PCI FW 3.0 Specification for details regarding _OSC usage. -2.3 AER error output +AER error output +---------------- When a PCIe AER error is captured, an error message will be output to console. If it's a correctable error, it is output as a warning. Otherwise, it is printed as an error. So users could choose different log level to filter out correctable error messages. -Below shows an example: -0000:50:00.0: PCIe Bus Error: severity=Uncorrected (Fatal), type=Transaction Layer, id=0500(Requester ID) -0000:50:00.0: device [8086:0329] error status/mask=00100000/00000000 -0000:50:00.0: [20] Unsupported Request (First) -0000:50:00.0: TLP Header: 04000001 00200a03 05010000 00050100 +Below shows an example:: + + 0000:50:00.0: PCIe Bus Error: severity=Uncorrected (Fatal), type=Transaction Layer, id=0500(Requester ID) + 0000:50:00.0: device [8086:0329] error status/mask=00100000/00000000 + 0000:50:00.0: [20] Unsupported Request (First) + 0000:50:00.0: TLP Header: 04000001 00200a03 05010000 00050100 In the example, 'Requester ID' means the ID of the device who sends the error message to root port. Pls. refer to pci express specs for other fields. -2.4 AER Statistics / Counters +AER Statistics / Counters +------------------------- When PCIe AER errors are captured, the counters / statistics are also exposed in the form of sysfs attributes which are documented at Documentation/ABI/testing/sysfs-bus-pci-devices-aer_stats -3. Developer Guide +Developer Guide +=============== To enable AER aware support requires a software driver to configure the AER capability structure within its device and to provide callbacks. @@ -120,7 +135,8 @@ hierarchy and links. These errors do not include any device specific errors because device specific errors will still get sent directly to the device driver. -3.1 Configure the AER capability structure +Configure the AER capability structure +-------------------------------------- AER aware drivers of PCI Express component need change the device control registers to enable AER. They also could change AER registers, @@ -128,9 +144,11 @@ including mask and severity registers. Helper function pci_enable_pcie_error_reporting could be used to enable AER. See section 3.3. -3.2. Provide callbacks +Provide callbacks +----------------- -3.2.1 callback reset_link to reset pci express link +callback reset_link to reset pci express link +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ This callback is used to reset the pci express physical link when a fatal error happens. The root port aer service driver provides a @@ -140,13 +158,15 @@ upstream ports should provide their own reset_link functions. In struct pcie_port_service_driver, a new pointer, reset_link, is added. +:: -pci_ers_result_t (*reset_link) (struct pci_dev *dev); + pci_ers_result_t (*reset_link) (struct pci_dev *dev); Section 3.2.2.2 provides more detailed info on when to call reset_link. -3.2.2 PCI error-recovery callbacks +PCI error-recovery callbacks +~~~~~~~~~~~~~~~~~~~~~~~~~~~~ The PCI Express AER Root driver uses error callbacks to coordinate with downstream device drivers associated with a hierarchy in question @@ -161,7 +181,8 @@ definitions of the callbacks. Below sections specify when to call the error callback functions. -3.2.2.1 Correctable errors +Correctable errors +~~~~~~~~~~~~~~~~~~ Correctable errors pose no impacts on the functionality of the interface. The PCI Express protocol can recover without any @@ -169,13 +190,16 @@ software intervention or any loss of data. These errors do not require any recovery actions. The AER driver clears the device's correctable error status register accordingly and logs these errors. -3.2.2.2 Non-correctable (non-fatal and fatal) errors +Non-correctable (non-fatal and fatal) errors +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ If an error message indicates a non-fatal error, performing link reset at upstream is not required. The AER driver calls error_detected(dev, pci_channel_io_normal) to all drivers associated within a hierarchy in -question. for example, -EndPoint<==>DownstreamPort B<==>UpstreamPort A<==>RootPort. +question. for example:: + + EndPoint<==>DownstreamPort B<==>UpstreamPort A<==>RootPort + If Upstream port A captures an AER error, the hierarchy consists of Downstream port B and EndPoint. @@ -199,53 +223,72 @@ function. If error_detected returns PCI_ERS_RESULT_CAN_RECOVER and reset_link returns PCI_ERS_RESULT_RECOVERED, the error handling goes to mmio_enabled. -3.3 helper functions +helper functions +---------------- +:: + + int pci_enable_pcie_error_reporting(struct pci_dev *dev); -3.3.1 int pci_enable_pcie_error_reporting(struct pci_dev *dev); pci_enable_pcie_error_reporting enables the device to send error messages to root port when an error is detected. Note that devices don't enable the error reporting by default, so device drivers need call this function to enable it. -3.3.2 int pci_disable_pcie_error_reporting(struct pci_dev *dev); +:: + + int pci_disable_pcie_error_reporting(struct pci_dev *dev); + pci_disable_pcie_error_reporting disables the device to send error messages to root port when an error is detected. -3.3.3 int pci_cleanup_aer_uncorrect_error_status(struct pci_dev *dev); +:: + + int pci_cleanup_aer_uncorrect_error_status(struct pci_dev *dev);` + pci_cleanup_aer_uncorrect_error_status cleanups the uncorrectable error status register. -3.4 Frequent Asked Questions +Frequent Asked Questions +------------------------ -Q: What happens if a PCI Express device driver does not provide an -error recovery handler (pci_driver->err_handler is equal to NULL)? +Q: + What happens if a PCI Express device driver does not provide an + error recovery handler (pci_driver->err_handler is equal to NULL)? -A: The devices attached with the driver won't be recovered. If the -error is fatal, kernel will print out warning messages. Please refer -to section 3 for more information. +A: + The devices attached with the driver won't be recovered. If the + error is fatal, kernel will print out warning messages. Please refer + to section 3 for more information. -Q: What happens if an upstream port service driver does not provide -callback reset_link? +Q: + What happens if an upstream port service driver does not provide + callback reset_link? -A: Fatal error recovery will fail if the errors are reported by the -upstream ports who are attached by the service driver. +A: + Fatal error recovery will fail if the errors are reported by the + upstream ports who are attached by the service driver. -Q: How does this infrastructure deal with driver that is not PCI -Express aware? +Q: + How does this infrastructure deal with driver that is not PCI + Express aware? -A: This infrastructure calls the error callback functions of the -driver when an error happens. But if the driver is not aware of -PCI Express, the device might not report its own errors to root -port. +A: + This infrastructure calls the error callback functions of the + driver when an error happens. But if the driver is not aware of + PCI Express, the device might not report its own errors to root + port. -Q: What modifications will that driver need to make it compatible -with the PCI Express AER Root driver? +Q: + What modifications will that driver need to make it compatible + with the PCI Express AER Root driver? -A: It could call the helper functions to enable AER in devices and -cleanup uncorrectable status register. Pls. refer to section 3.3. +A: + It could call the helper functions to enable AER in devices and + cleanup uncorrectable status register. Pls. refer to section 3.3. -4. Software error injection +Software error injection +======================== Debugging PCIe AER error recovery code is quite difficult because it is hard to trigger real hardware errors. Software based error @@ -261,6 +304,7 @@ After reboot with new kernel or insert the module, a device file named Then, you need a user space tool named aer-inject, which can be gotten from: + https://git.kernel.org/cgit/linux/kernel/git/gong.chen/aer-inject.git/ More information about aer-inject can be found in the document comes diff --git a/Documentation/PCI/PCIEBUS-HOWTO.txt b/Documentation/PCI/picebus-howto.rst index 15f0bb3b5045..f882ff62c51f 100644 --- a/Documentation/PCI/PCIEBUS-HOWTO.txt +++ b/Documentation/PCI/picebus-howto.rst @@ -1,16 +1,23 @@ - The PCI Express Port Bus Driver Guide HOWTO - Tom L Nguyen tom.l.nguyen@intel.com - 11/03/2004 +.. SPDX-License-Identifier: GPL-2.0 +.. include:: <isonum.txt> -1. About this guide +=========================================== +The PCI Express Port Bus Driver Guide HOWTO +=========================================== + +:Author: Tom L Nguyen tom.l.nguyen@intel.com 11/03/2004 +:Copyright: |copy| 2004 Intel Corporation + +About this guide +================ This guide describes the basics of the PCI Express Port Bus driver and provides information on how to enable the service drivers to register/unregister with the PCI Express Port Bus Driver. -2. Copyright 2004 Intel Corporation -3. What is the PCI Express Port Bus Driver +What is the PCI Express Port Bus Driver +======================================= A PCI Express Port is a logical PCI-PCI Bridge structure. There are two types of PCI Express Port: the Root Port and the Switch @@ -30,7 +37,8 @@ support (AER), and virtual channel support (VC). These services may be handled by a single complex driver or be individually distributed and handled by corresponding service drivers. -4. Why use the PCI Express Port Bus Driver? +Why use the PCI Express Port Bus Driver? +======================================== In existing Linux kernels, the Linux Device Driver Model allows a physical device to be handled by only a single driver. The PCI @@ -51,28 +59,31 @@ PCI Express Ports and distributes all provided service requests to the corresponding service drivers as required. Some key advantages of using the PCI Express Port Bus driver are listed below: - - Allow multiple service drivers to run simultaneously on - a PCI-PCI Bridge Port device. + - Allow multiple service drivers to run simultaneously on + a PCI-PCI Bridge Port device. - - Allow service drivers implemented in an independent - staged approach. + - Allow service drivers implemented in an independent + staged approach. - - Allow one service driver to run on multiple PCI-PCI Bridge - Port devices. + - Allow one service driver to run on multiple PCI-PCI Bridge + Port devices. - - Manage and distribute resources of a PCI-PCI Bridge Port - device to requested service drivers. + - Manage and distribute resources of a PCI-PCI Bridge Port + device to requested service drivers. -5. Configuring the PCI Express Port Bus Driver vs. Service Drivers +Configuring the PCI Express Port Bus Driver vs. Service Drivers +=============================================================== -5.1 Including the PCI Express Port Bus Driver Support into the Kernel +Including the PCI Express Port Bus Driver Support into the Kernel +----------------------------------------------------------------- Including the PCI Express Port Bus driver depends on whether the PCI Express support is included in the kernel config. The kernel will automatically include the PCI Express Port Bus driver as a kernel driver when the PCI Express support is enabled in the kernel. -5.2 Enabling Service Driver Support +Enabling Service Driver Support +------------------------------- PCI device drivers are implemented based on Linux Device Driver Model. All service drivers are PCI device drivers. As discussed above, it is @@ -89,9 +100,11 @@ header file /include/linux/pcieport_if.h, before calling these APIs. Failure to do so will result an identity mismatch, which prevents the PCI Express Port Bus driver from loading a service driver. -5.2.1 pcie_port_service_register +pcie_port_service_register +~~~~~~~~~~~~~~~~~~~~~~~~~~ +:: -int pcie_port_service_register(struct pcie_port_service_driver *new) + int pcie_port_service_register(struct pcie_port_service_driver *new) This API replaces the Linux Driver Model's pci_register_driver API. A service driver should always calls pcie_port_service_register at @@ -99,69 +112,76 @@ module init. Note that after service driver being loaded, calls such as pci_enable_device(dev) and pci_set_master(dev) are no longer necessary since these calls are executed by the PCI Port Bus driver. -5.2.2 pcie_port_service_unregister +pcie_port_service_unregister +~~~~~~~~~~~~~~~~~~~~~~~~~~~~ +:: -void pcie_port_service_unregister(struct pcie_port_service_driver *new) + void pcie_port_service_unregister(struct pcie_port_service_driver *new) pcie_port_service_unregister replaces the Linux Driver Model's pci_unregister_driver. It's always called by service driver when a module exits. -5.2.3 Sample Code +Sample Code +~~~~~~~~~~~ Below is sample service driver code to initialize the port service driver data structure. +:: -static struct pcie_port_service_id service_id[] = { { - .vendor = PCI_ANY_ID, - .device = PCI_ANY_ID, - .port_type = PCIE_RC_PORT, - .service_type = PCIE_PORT_SERVICE_AER, - }, { /* end: all zeroes */ } -}; + static struct pcie_port_service_id service_id[] = { { + .vendor = PCI_ANY_ID, + .device = PCI_ANY_ID, + .port_type = PCIE_RC_PORT, + .service_type = PCIE_PORT_SERVICE_AER, + }, { /* end: all zeroes */ } + }; -static struct pcie_port_service_driver root_aerdrv = { - .name = (char *)device_name, - .id_table = &service_id[0], + static struct pcie_port_service_driver root_aerdrv = { + .name = (char *)device_name, + .id_table = &service_id[0], - .probe = aerdrv_load, - .remove = aerdrv_unload, + .probe = aerdrv_load, + .remove = aerdrv_unload, - .suspend = aerdrv_suspend, - .resume = aerdrv_resume, -}; + .suspend = aerdrv_suspend, + .resume = aerdrv_resume, + }; Below is a sample code for registering/unregistering a service driver. +:: -static int __init aerdrv_service_init(void) -{ - int retval = 0; + static int __init aerdrv_service_init(void) + { + int retval = 0; - retval = pcie_port_service_register(&root_aerdrv); - if (!retval) { - /* - * FIX ME - */ - } - return retval; -} + retval = pcie_port_service_register(&root_aerdrv); + if (!retval) { + /* + * FIX ME + */ + } + return retval; + } -static void __exit aerdrv_service_exit(void) -{ - pcie_port_service_unregister(&root_aerdrv); -} + static void __exit aerdrv_service_exit(void) + { + pcie_port_service_unregister(&root_aerdrv); + } -module_init(aerdrv_service_init); -module_exit(aerdrv_service_exit); + module_init(aerdrv_service_init); + module_exit(aerdrv_service_exit); -6. Possible Resource Conflicts +Possible Resource Conflicts +=========================== Since all service drivers of a PCI-PCI Bridge Port device are allowed to run simultaneously, below lists a few of possible resource conflicts with proposed solutions. -6.1 MSI and MSI-X Vector Resource +MSI and MSI-X Vector Resource +----------------------------- Once MSI or MSI-X interrupts are enabled on a device, it stays in this mode until they are disabled again. Since service drivers of the same @@ -179,7 +199,8 @@ driver. Service drivers should use (struct pcie_device*)dev->irq to call request_irq/free_irq. In addition, the interrupt mode is stored in the field interrupt_mode of struct pcie_device. -6.3 PCI Memory/IO Mapped Regions +PCI Memory/IO Mapped Regions +---------------------------- Service drivers for PCI Express Power Management (PME), Advanced Error Reporting (AER), Hot-Plug (HP) and Virtual Channel (VC) access @@ -188,7 +209,8 @@ registers accessed are independent of each other. This patch assumes that all service drivers will be well behaved and not overwrite other service driver's configuration settings. -6.4 PCI Config Registers +PCI Config Registers +-------------------- Each service driver runs its PCI config operations on its own capability structure except the PCI Express capability structure, in diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index ed104a44e8b2..f8b62360b18c 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -13,7 +13,7 @@ For ARM64, ONLY "acpi=off", "acpi=on" or "acpi=force" are available - See also Documentation/power/runtime_pm.txt, pci=noacpi + See also Documentation/power/runtime_pm.rst, pci=noacpi acpi_apic_instance= [ACPI, IOAPIC] Format: <int> @@ -223,7 +223,7 @@ acpi_sleep= [HW,ACPI] Sleep options Format: { s3_bios, s3_mode, s3_beep, s4_nohwsig, old_ordering, nonvs, sci_force_enable, nobl } - See Documentation/power/video.txt for information on + See Documentation/power/video.rst for information on s3_bios and s3_mode. s3_beep is for debugging; it makes the PC's speaker beep as soon as the kernel's real-mode entry point is called. @@ -4119,7 +4119,7 @@ Specify the offset from the beginning of the partition given by "resume=" at which the swap header is located, in <PAGE_SIZE> units (needed only for swap files). - See Documentation/power/swsusp-and-swap-files.txt + See Documentation/power/swsusp-and-swap-files.rst resumedelay= [HIBERNATION] Delay (in seconds) to pause before attempting to read the resume files diff --git a/Documentation/cpu-freq/core.txt b/Documentation/cpu-freq/core.txt index 073f128af5a7..55193e680250 100644 --- a/Documentation/cpu-freq/core.txt +++ b/Documentation/cpu-freq/core.txt @@ -95,7 +95,7 @@ flags - flags of the cpufreq driver 3. CPUFreq Table Generation with Operating Performance Point (OPP) ================================================================== -For details about OPP, see Documentation/power/opp.txt +For details about OPP, see Documentation/power/opp.rst dev_pm_opp_init_cpufreq_table - This function provides a ready to use conversion routine to translate diff --git a/Documentation/devicetree/bindings/pci/mobiveil-pcie.txt b/Documentation/devicetree/bindings/pci/mobiveil-pcie.txt index a618d4787dd7..64156993e052 100644 --- a/Documentation/devicetree/bindings/pci/mobiveil-pcie.txt +++ b/Documentation/devicetree/bindings/pci/mobiveil-pcie.txt @@ -10,8 +10,10 @@ Required properties: interrupt source. The value must be 1. - compatible: Should contain "mbvl,gpex40-pcie" - reg: Should contain PCIe registers location and length + Mandatory: "config_axi_slave": PCIe controller registers "csr_axi_slave" : Bridge config registers + Optional: "gpio_slave" : GPIO registers to control slot power "apb_csr" : MSI registers diff --git a/Documentation/devicetree/bindings/pci/nvidia,tegra20-pcie.txt b/Documentation/devicetree/bindings/pci/nvidia,tegra20-pcie.txt index 145a4f04194f..7939bca47861 100644 --- a/Documentation/devicetree/bindings/pci/nvidia,tegra20-pcie.txt +++ b/Documentation/devicetree/bindings/pci/nvidia,tegra20-pcie.txt @@ -65,6 +65,14 @@ Required properties: - afi - pcie_x +Optional properties: +- pinctrl-names: A list of pinctrl state names. Must contain the following + entries: + - "default": active state, puts PCIe I/O out of deep power down state + - "idle": puts PCIe I/O into deep power down state +- pinctrl-0: phandle for the default/active state of pin configurations. +- pinctrl-1: phandle for the idle state of pin configurations. + Required properties on Tegra124 and later (deprecated): - phys: Must contain an entry for each entry in phy-names. - phy-names: Must include the following entries: diff --git a/Documentation/devicetree/bindings/pci/pci.txt b/Documentation/devicetree/bindings/pci/pci.txt index 92c01db610df..2a5d91024059 100644 --- a/Documentation/devicetree/bindings/pci/pci.txt +++ b/Documentation/devicetree/bindings/pci/pci.txt @@ -24,6 +24,9 @@ driver implementation may support the following properties: unsupported link speed, for instance, trying to do training for unsupported link speed, etc. Must be '4' for gen4, '3' for gen3, '2' for gen2, and '1' for gen1. Any other values are invalid. +- reset-gpios: + If present this property specifies PERST# GPIO. Host drivers can parse the + GPIO and apply fundamental reset to endpoints. PCI-PCI Bridge properties ------------------------- diff --git a/Documentation/devicetree/bindings/pci/qcom,pcie.txt b/Documentation/devicetree/bindings/pci/qcom,pcie.txt index 1fd703bd73e0..ada80b01bf0c 100644 --- a/Documentation/devicetree/bindings/pci/qcom,pcie.txt +++ b/Documentation/devicetree/bindings/pci/qcom,pcie.txt @@ -10,6 +10,7 @@ - "qcom,pcie-msm8996" for msm8996 or apq8096 - "qcom,pcie-ipq4019" for ipq4019 - "qcom,pcie-ipq8074" for ipq8074 + - "qcom,pcie-qcs404" for qcs404 - reg: Usage: required @@ -116,6 +117,15 @@ - "ahb" AHB clock - "aux" Auxiliary clock +- clock-names: + Usage: required for qcs404 + Value type: <stringlist> + Definition: Should contain the following entries + - "iface" AHB clock + - "aux" Auxiliary clock + - "master_bus" AXI Master clock + - "slave_bus" AXI Slave clock + - resets: Usage: required Value type: <prop-encoded-array> @@ -167,6 +177,17 @@ - "ahb" AHB Reset - "axi_m_sticky" AXI Master Sticky reset +- reset-names: + Usage: required for qcs404 + Value type: <stringlist> + Definition: Should contain the following entries + - "axi_m" AXI Master reset + - "axi_s" AXI Slave reset + - "axi_m_sticky" AXI Master Sticky reset + - "pipe_sticky" PIPE sticky reset + - "pwr" PWR reset + - "ahb" AHB reset + - power-domains: Usage: required for apq8084 and msm8996/apq8096 Value type: <prop-encoded-array> @@ -195,12 +216,12 @@ Definition: A phandle to the PCIe endpoint power supply - phys: - Usage: required for apq8084 + Usage: required for apq8084 and qcs404 Value type: <phandle> Definition: List of phandle(s) as listed in phy-names property - phy-names: - Usage: required for apq8084 + Usage: required for apq8084 and qcs404 Value type: <stringlist> Definition: Should contain "pciephy" diff --git a/Documentation/devicetree/bindings/pci/rcar-pci.txt b/Documentation/devicetree/bindings/pci/rcar-pci.txt index 6904882a0e94..45bba9f88a51 100644 --- a/Documentation/devicetree/bindings/pci/rcar-pci.txt +++ b/Documentation/devicetree/bindings/pci/rcar-pci.txt @@ -3,6 +3,7 @@ Required properties: compatible: "renesas,pcie-r8a7743" for the R8A7743 SoC; "renesas,pcie-r8a7744" for the R8A7744 SoC; + "renesas,pcie-r8a774a1" for the R8A774A1 SoC; "renesas,pcie-r8a774c0" for the R8A774C0 SoC; "renesas,pcie-r8a7779" for the R8A7779 SoC; "renesas,pcie-r8a7790" for the R8A7790 SoC; diff --git a/Documentation/driver-api/pm/devices.rst b/Documentation/driver-api/pm/devices.rst index 30835683616a..f66c7b9126ea 100644 --- a/Documentation/driver-api/pm/devices.rst +++ b/Documentation/driver-api/pm/devices.rst @@ -225,7 +225,7 @@ system-wide transition to a sleep state even though its :c:member:`runtime_auto` flag is clear. For more information about the runtime power management framework, refer to -:file:`Documentation/power/runtime_pm.txt`. +:file:`Documentation/power/runtime_pm.rst`. Calling Drivers to Enter and Leave System Sleep States @@ -728,7 +728,7 @@ it into account in any way. Devices may be defined as IRQ-safe which indicates to the PM core that their runtime PM callbacks may be invoked with disabled interrupts (see -:file:`Documentation/power/runtime_pm.txt` for more information). If an +:file:`Documentation/power/runtime_pm.rst` for more information). If an IRQ-safe device belongs to a PM domain, the runtime PM of the domain will be disallowed, unless the domain itself is defined as IRQ-safe. However, it makes sense to define a PM domain as IRQ-safe only if all the devices in it @@ -795,7 +795,7 @@ so on) and the final state of the device must reflect the "active" runtime PM status in that case. During system-wide resume from a sleep state it's easiest to put devices into -the full-power state, as explained in :file:`Documentation/power/runtime_pm.txt`. +the full-power state, as explained in :file:`Documentation/power/runtime_pm.rst`. [Refer to that document for more information regarding this particular issue as well as for information on the device runtime power management framework in general.] diff --git a/Documentation/driver-api/usb/power-management.rst b/Documentation/driver-api/usb/power-management.rst index 4a74cf6f2797..2525c3622cae 100644 --- a/Documentation/driver-api/usb/power-management.rst +++ b/Documentation/driver-api/usb/power-management.rst @@ -46,7 +46,7 @@ device is turned off while the system as a whole remains running, we call it a "dynamic suspend" (also known as a "runtime suspend" or "selective suspend"). This document concentrates mostly on how dynamic PM is implemented in the USB subsystem, although system PM is -covered to some extent (see ``Documentation/power/*.txt`` for more +covered to some extent (see ``Documentation/power/*.rst`` for more information about system PM). System PM support is present only if the kernel was built with diff --git a/Documentation/index.rst b/Documentation/index.rst index 71a77feb779b..00a0fe4241a4 100644 --- a/Documentation/index.rst +++ b/Documentation/index.rst @@ -103,6 +103,7 @@ needed). vm/index bpf/index usb/index + PCI/index misc-devices/index Architecture-specific documentation diff --git a/Documentation/power/apm-acpi.txt b/Documentation/power/apm-acpi.rst index 6cc423d3662e..5b90d947126d 100644 --- a/Documentation/power/apm-acpi.txt +++ b/Documentation/power/apm-acpi.rst @@ -1,5 +1,7 @@ +============ APM or ACPI? ------------- +============ + If you have a relatively recent x86 mobile, desktop, or server system, odds are it supports either Advanced Power Management (APM) or Advanced Configuration and Power Interface (ACPI). ACPI is the newer @@ -28,5 +30,7 @@ and be sure that they are started sometime in the system boot process. Go ahead and start both. If ACPI or APM is not available on your system the associated daemon will exit gracefully. - apmd: http://ftp.debian.org/pool/main/a/apmd/ - acpid: http://acpid.sf.net/ + ===== ======================================= + apmd http://ftp.debian.org/pool/main/a/apmd/ + acpid http://acpid.sf.net/ + ===== ======================================= diff --git a/Documentation/power/basic-pm-debugging.txt b/Documentation/power/basic-pm-debugging.rst index 708f87f78a75..69862e759c30 100644 --- a/Documentation/power/basic-pm-debugging.txt +++ b/Documentation/power/basic-pm-debugging.rst @@ -1,12 +1,16 @@ +================================= Debugging hibernation and suspend +================================= + (C) 2007 Rafael J. Wysocki <rjw@sisk.pl>, GPL 1. Testing hibernation (aka suspend to disk or STD) +=================================================== -To check if hibernation works, you can try to hibernate in the "reboot" mode: +To check if hibernation works, you can try to hibernate in the "reboot" mode:: -# echo reboot > /sys/power/disk -# echo disk > /sys/power/state + # echo reboot > /sys/power/disk + # echo disk > /sys/power/state and the system should create a hibernation image, reboot, resume and get back to the command prompt where you have started the transition. If that happens, @@ -15,20 +19,21 @@ test at least a couple of times in a row for confidence. [This is necessary, because some problems only show up on a second attempt at suspending and resuming the system.] Moreover, hibernating in the "reboot" and "shutdown" modes causes the PM core to skip some platform-related callbacks which on ACPI -systems might be necessary to make hibernation work. Thus, if your machine fails -to hibernate or resume in the "reboot" mode, you should try the "platform" mode: +systems might be necessary to make hibernation work. Thus, if your machine +fails to hibernate or resume in the "reboot" mode, you should try the +"platform" mode:: -# echo platform > /sys/power/disk -# echo disk > /sys/power/state + # echo platform > /sys/power/disk + # echo disk > /sys/power/state which is the default and recommended mode of hibernation. Unfortunately, the "platform" mode of hibernation does not work on some systems with broken BIOSes. In such cases the "shutdown" mode of hibernation might -work: +work:: -# echo shutdown > /sys/power/disk -# echo disk > /sys/power/state + # echo shutdown > /sys/power/disk + # echo disk > /sys/power/state (it is similar to the "reboot" mode, but it requires you to press the power button to make the system resume). @@ -37,6 +42,7 @@ If neither "platform" nor "shutdown" hibernation mode works, you will need to identify what goes wrong. a) Test modes of hibernation +---------------------------- To find out why hibernation fails on your system, you can use a special testing facility available if the kernel is compiled with CONFIG_PM_DEBUG set. Then, @@ -44,36 +50,38 @@ there is the file /sys/power/pm_test that can be used to make the hibernation core run in a test mode. There are 5 test modes available: freezer -- test the freezing of processes + - test the freezing of processes devices -- test the freezing of processes and suspending of devices + - test the freezing of processes and suspending of devices platform -- test the freezing of processes, suspending of devices and platform - global control methods(*) + - test the freezing of processes, suspending of devices and platform + global control methods [1]_ processors -- test the freezing of processes, suspending of devices, platform - global control methods(*) and the disabling of nonboot CPUs + - test the freezing of processes, suspending of devices, platform + global control methods [1]_ and the disabling of nonboot CPUs core -- test the freezing of processes, suspending of devices, platform global - control methods(*), the disabling of nonboot CPUs and suspending of - platform/system devices + - test the freezing of processes, suspending of devices, platform global + control methods\ [1]_, the disabling of nonboot CPUs and suspending + of platform/system devices + +.. [1] -(*) the platform global control methods are only available on ACPI systems + the platform global control methods are only available on ACPI systems and are only tested if the hibernation mode is set to "platform" To use one of them it is necessary to write the corresponding string to /sys/power/pm_test (eg. "devices" to test the freezing of processes and suspending devices) and issue the standard hibernation commands. For example, to use the "devices" test mode along with the "platform" mode of hibernation, -you should do the following: +you should do the following:: -# echo devices > /sys/power/pm_test -# echo platform > /sys/power/disk -# echo disk > /sys/power/state + # echo devices > /sys/power/pm_test + # echo platform > /sys/power/disk + # echo disk > /sys/power/state Then, the kernel will try to freeze processes, suspend devices, wait a few seconds (5 by default, but configurable by the suspend.pm_test_delay module @@ -108,11 +116,12 @@ If the "devices" test fails, most likely there is a driver that cannot suspend or resume its device (in the latter case the system may hang or become unstable after the test, so please take that into consideration). To find this driver, you can carry out a binary search according to the rules: + - if the test fails, unload a half of the drivers currently loaded and repeat -(that would probably involve rebooting the system, so always note what drivers -have been loaded before the test), + (that would probably involve rebooting the system, so always note what drivers + have been loaded before the test), - if the test succeeds, load a half of the drivers you have unloaded most -recently and repeat. + recently and repeat. Once you have found the failing driver (there can be more than just one of them), you have to unload it every time before hibernation. In that case please @@ -146,6 +155,7 @@ indicates a serious problem that very well may be related to the hardware, but please report it anyway. b) Testing minimal configuration +-------------------------------- If all of the hibernation test modes work, you can boot the system with the "init=/bin/bash" command line parameter and attempt to hibernate in the @@ -165,14 +175,15 @@ Again, if you find the offending module(s), it(they) must be unloaded every time before hibernation, and please report the problem with it(them). c) Using the "test_resume" hibernation option +--------------------------------------------- /sys/power/disk generally tells the kernel what to do after creating a hibernation image. One of the available options is "test_resume" which causes the just created image to be used for immediate restoration. Namely, -after doing: +after doing:: -# echo test_resume > /sys/power/disk -# echo disk > /sys/power/state + # echo test_resume > /sys/power/disk + # echo disk > /sys/power/state a hibernation image will be created and a resume from it will be triggered immediately without involving the platform firmware in any way. @@ -190,6 +201,7 @@ to resume may be related to the differences between the restore and image kernels. d) Advanced debugging +--------------------- In case that hibernation does not work on your system even in the minimal configuration and compiling more drivers as modules is not practical or some @@ -200,9 +212,10 @@ kernel messages using the serial console. This may provide you with some information about the reasons of the suspend (resume) failure. Alternatively, it may be possible to use a FireWire port for debugging with firescope (http://v3.sk/~lkundrak/firescope/). On x86 it is also possible to -use the PM_TRACE mechanism documented in Documentation/power/s2ram.txt . +use the PM_TRACE mechanism documented in Documentation/power/s2ram.rst . 2. Testing suspend to RAM (STR) +=============================== To verify that the STR works, it is generally more convenient to use the s2ram tool available from http://suspend.sf.net and documented at @@ -230,7 +243,8 @@ you will have to unload them every time before an STR transition (ie. before you run s2ram), and please report the problems with them. There is a debugfs entry which shows the suspend to RAM statistics. Here is an -example of its output. +example of its output:: + # mount -t debugfs none /sys/kernel/debug # cat /sys/kernel/debug/suspend_stats success: 20 @@ -248,6 +262,7 @@ example of its output. -16 last_failed_step: suspend suspend + Field success means the success number of suspend to RAM, and field fail means the failure number. Others are the failure number of different steps of suspend to RAM. suspend_stats just lists the last 2 failed devices, error number and diff --git a/Documentation/power/charger-manager.txt b/Documentation/power/charger-manager.rst index 9ff1105e58d6..84fab9376792 100644 --- a/Documentation/power/charger-manager.txt +++ b/Documentation/power/charger-manager.rst @@ -1,4 +1,7 @@ +=============== Charger Manager +=============== + (C) 2011 MyungJoo Ham <myungjoo.ham@samsung.com>, GPL Charger Manager provides in-kernel battery charger management that @@ -55,41 +58,39 @@ Charger Manager supports the following: notification to users with UEVENT. 2. Global Charger-Manager Data related with suspend_again -======================================================== +========================================================= In order to setup Charger Manager with suspend-again feature (in-suspend monitoring), the user should provide charger_global_desc -with setup_charger_manager(struct charger_global_desc *). +with setup_charger_manager(`struct charger_global_desc *`). This charger_global_desc data for in-suspend monitoring is global as the name suggests. Thus, the user needs to provide only once even if there are multiple batteries. If there are multiple batteries, the multiple instances of Charger Manager share the same charger_global_desc and it will manage in-suspend monitoring for all instances of Charger Manager. -The user needs to provide all the three entries properly in order to activate -in-suspend monitoring: - -struct charger_global_desc { +The user needs to provide all the three entries to `struct charger_global_desc` +properly in order to activate in-suspend monitoring: -char *rtc_name; - : The name of rtc (e.g., "rtc0") used to wakeup the system from +`char *rtc_name;` + The name of rtc (e.g., "rtc0") used to wakeup the system from suspend for Charger Manager. The alarm interrupt (AIE) of the rtc should be able to wake up the system from suspend. Charger Manager saves and restores the alarm value and use the previously-defined alarm if it is going to go off earlier than Charger Manager so that Charger Manager does not interfere with previously-defined alarms. -bool (*rtc_only_wakeup)(void); - : This callback should let CM know whether +`bool (*rtc_only_wakeup)(void);` + This callback should let CM know whether the wakeup-from-suspend is caused only by the alarm of "rtc" in the same struct. If there is any other wakeup source triggered the wakeup, it should return false. If the "rtc" is the only wakeup reason, it should return true. -bool assume_timer_stops_in_suspend; - : if true, Charger Manager assumes that +`bool assume_timer_stops_in_suspend;` + if true, Charger Manager assumes that the timer (CM uses jiffies as timer) stops during suspend. Then, CM assumes that the suspend-duration is same as the alarm length. -}; + 3. How to setup suspend_again ============================= @@ -109,26 +110,28 @@ if the system was woken up by Charger Manager and the polling ============================================= For each battery charged independently from other batteries (if a series of batteries are charged by a single charger, they are counted as one independent -battery), an instance of Charger Manager is attached to it. +battery), an instance of Charger Manager is attached to it. The following -struct charger_desc { +struct charger_desc elements: -char *psy_name; - : The power-supply-class name of the battery. Default is +`char *psy_name;` + The power-supply-class name of the battery. Default is "battery" if psy_name is NULL. Users can access the psy entries at "/sys/class/power_supply/[psy_name]/". -enum polling_modes polling_mode; - : CM_POLL_DISABLE: do not poll this battery. - CM_POLL_ALWAYS: always poll this battery. - CM_POLL_EXTERNAL_POWER_ONLY: poll this battery if and only if - an external power source is attached. - CM_POLL_CHARGING_ONLY: poll this battery if and only if the - battery is being charged. - -unsigned int fullbatt_vchkdrop_ms; -unsigned int fullbatt_vchkdrop_uV; - : If both have non-zero values, Charger Manager will check the +`enum polling_modes polling_mode;` + CM_POLL_DISABLE: + do not poll this battery. + CM_POLL_ALWAYS: + always poll this battery. + CM_POLL_EXTERNAL_POWER_ONLY: + poll this battery if and only if an external power + source is attached. + CM_POLL_CHARGING_ONLY: + poll this battery if and only if the battery is being charged. + +`unsigned int fullbatt_vchkdrop_ms; / unsigned int fullbatt_vchkdrop_uV;` + If both have non-zero values, Charger Manager will check the battery voltage drop fullbatt_vchkdrop_ms after the battery is fully charged. If the voltage drop is over fullbatt_vchkdrop_uV, Charger Manager will try to recharge the battery by disabling and enabling @@ -136,50 +139,52 @@ unsigned int fullbatt_vchkdrop_uV; condition) is needed to be implemented with hardware interrupts from fuel gauges or charger devices/chips. -unsigned int fullbatt_uV; - : If specified with a non-zero value, Charger Manager assumes +`unsigned int fullbatt_uV;` + If specified with a non-zero value, Charger Manager assumes that the battery is full (capacity = 100) if the battery is not being charged and the battery voltage is equal to or greater than fullbatt_uV. -unsigned int polling_interval_ms; - : Required polling interval in ms. Charger Manager will poll +`unsigned int polling_interval_ms;` + Required polling interval in ms. Charger Manager will poll this battery every polling_interval_ms or more frequently. -enum data_source battery_present; - : CM_BATTERY_PRESENT: assume that the battery exists. - CM_NO_BATTERY: assume that the battery does not exists. - CM_FUEL_GAUGE: get battery presence information from fuel gauge. - CM_CHARGER_STAT: get battery presence from chargers. - -char **psy_charger_stat; - : An array ending with NULL that has power-supply-class names of +`enum data_source battery_present;` + CM_BATTERY_PRESENT: + assume that the battery exists. + CM_NO_BATTERY: + assume that the battery does not exists. + CM_FUEL_GAUGE: + get battery presence information from fuel gauge. + CM_CHARGER_STAT: + get battery presence from chargers. + +`char **psy_charger_stat;` + An array ending with NULL that has power-supply-class names of chargers. Each power-supply-class should provide "PRESENT" (if battery_present is "CM_CHARGER_STAT"), "ONLINE" (shows whether an external power source is attached or not), and "STATUS" (shows whether the battery is {"FULL" or not FULL} or {"FULL", "Charging", "Discharging", "NotCharging"}). -int num_charger_regulators; -struct regulator_bulk_data *charger_regulators; - : Regulators representing the chargers in the form for +`int num_charger_regulators; / struct regulator_bulk_data *charger_regulators;` + Regulators representing the chargers in the form for regulator framework's bulk functions. -char *psy_fuel_gauge; - : Power-supply-class name of the fuel gauge. +`char *psy_fuel_gauge;` + Power-supply-class name of the fuel gauge. -int (*temperature_out_of_range)(int *mC); -bool measure_battery_temp; - : This callback returns 0 if the temperature is safe for charging, +`int (*temperature_out_of_range)(int *mC); / bool measure_battery_temp;` + This callback returns 0 if the temperature is safe for charging, a positive number if it is too hot to charge, and a negative number if it is too cold to charge. With the variable mC, the callback returns the temperature in 1/1000 of centigrade. The source of temperature can be battery or ambient one according to the value of measure_battery_temp. -}; + 5. Notify Charger-Manager of charger events: cm_notify_event() -========================================================= +============================================================== If there is an charger event is required to notify Charger Manager, a charger device driver that triggers the event can call cm_notify_event(psy, type, msg) to notify the corresponding Charger Manager. diff --git a/Documentation/power/drivers-testing.txt b/Documentation/power/drivers-testing.rst index 638afdf4d6b8..e53f1999fc39 100644 --- a/Documentation/power/drivers-testing.txt +++ b/Documentation/power/drivers-testing.rst @@ -1,7 +1,11 @@ +==================================================== Testing suspend and resume support in device drivers +==================================================== + (C) 2007 Rafael J. Wysocki <rjw@sisk.pl>, GPL 1. Preparing the test system +============================ Unfortunately, to effectively test the support for the system-wide suspend and resume transitions in a driver, it is necessary to suspend and resume a fully @@ -14,19 +18,20 @@ the machine's BIOS. Of course, for this purpose the test system has to be known to suspend and resume without the driver being tested. Thus, if possible, you should first resolve all suspend/resume-related problems in the test system before you start -testing the new driver. Please see Documentation/power/basic-pm-debugging.txt +testing the new driver. Please see Documentation/power/basic-pm-debugging.rst for more information about the debugging of suspend/resume functionality. 2. Testing the driver +===================== Once you have resolved the suspend/resume-related problems with your test system without the new driver, you are ready to test it: a) Build the driver as a module, load it and try the test modes of hibernation - (see: Documentation/power/basic-pm-debugging.txt, 1). + (see: Documentation/power/basic-pm-debugging.rst, 1). b) Load the driver and attempt to hibernate in the "reboot", "shutdown" and - "platform" modes (see: Documentation/power/basic-pm-debugging.txt, 1). + "platform" modes (see: Documentation/power/basic-pm-debugging.rst, 1). c) Compile the driver directly into the kernel and try the test modes of hibernation. @@ -34,12 +39,12 @@ c) Compile the driver directly into the kernel and try the test modes of d) Attempt to hibernate with the driver compiled directly into the kernel in the "reboot", "shutdown" and "platform" modes. -e) Try the test modes of suspend (see: Documentation/power/basic-pm-debugging.txt, +e) Try the test modes of suspend (see: Documentation/power/basic-pm-debugging.rst, 2). [As far as the STR tests are concerned, it should not matter whether or not the driver is built as a module.] f) Attempt to suspend to RAM using the s2ram tool with the driver loaded - (see: Documentation/power/basic-pm-debugging.txt, 2). + (see: Documentation/power/basic-pm-debugging.rst, 2). Each of the above tests should be repeated several times and the STD tests should be mixed with the STR tests. If any of them fails, the driver cannot be diff --git a/Documentation/power/energy-model.txt b/Documentation/power/energy-model.rst index a2b0ae4c76bd..90a345d57ae9 100644 --- a/Documentation/power/energy-model.txt +++ b/Documentation/power/energy-model.rst @@ -1,6 +1,6 @@ - ==================== - Energy Model of CPUs - ==================== +==================== +Energy Model of CPUs +==================== 1. Overview ----------- @@ -20,7 +20,7 @@ kernel, hence enabling to avoid redundant work. The figure below depicts an example of drivers (Arm-specific here, but the approach is applicable to any architecture) providing power costs to the EM -framework, and interested clients reading the data from it. +framework, and interested clients reading the data from it:: +---------------+ +-----------------+ +---------------+ | Thermal (IPA) | | Scheduler (EAS) | | Other | @@ -58,15 +58,17 @@ micro-architectures. 2. Core APIs ------------ - 2.1 Config options +2.1 Config options +^^^^^^^^^^^^^^^^^^ CONFIG_ENERGY_MODEL must be enabled to use the EM framework. - 2.2 Registration of performance domains +2.2 Registration of performance domains +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Drivers are expected to register performance domains into the EM framework by -calling the following API: +calling the following API:: int em_register_perf_domain(cpumask_t *span, unsigned int nr_states, struct em_data_callback *cb); @@ -80,7 +82,8 @@ callback, and kernel/power/energy_model.c for further documentation on this API. - 2.3 Accessing performance domains +2.3 Accessing performance domains +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Subsystems interested in the energy model of a CPU can retrieve it using the em_cpu_get() API. The energy model tables are allocated once upon creation of @@ -99,46 +102,46 @@ More details about the above APIs can be found in include/linux/energy_model.h. This section provides a simple example of a CPUFreq driver registering a performance domain in the Energy Model framework using the (fake) 'foo' protocol. The driver implements an est_power() function to be provided to the -EM framework. - - -> drivers/cpufreq/foo_cpufreq.c - -01 static int est_power(unsigned long *mW, unsigned long *KHz, int cpu) -02 { -03 long freq, power; -04 -05 /* Use the 'foo' protocol to ceil the frequency */ -06 freq = foo_get_freq_ceil(cpu, *KHz); -07 if (freq < 0); -08 return freq; -09 -10 /* Estimate the power cost for the CPU at the relevant freq. */ -11 power = foo_estimate_power(cpu, freq); -12 if (power < 0); -13 return power; -14 -15 /* Return the values to the EM framework */ -16 *mW = power; -17 *KHz = freq; -18 -19 return 0; -20 } -21 -22 static int foo_cpufreq_init(struct cpufreq_policy *policy) -23 { -24 struct em_data_callback em_cb = EM_DATA_CB(est_power); -25 int nr_opp, ret; -26 -27 /* Do the actual CPUFreq init work ... */ -28 ret = do_foo_cpufreq_init(policy); -29 if (ret) -30 return ret; -31 -32 /* Find the number of OPPs for this policy */ -33 nr_opp = foo_get_nr_opp(policy); -34 -35 /* And register the new performance domain */ -36 em_register_perf_domain(policy->cpus, nr_opp, &em_cb); -37 -38 return 0; -39 } +EM framework:: + + -> drivers/cpufreq/foo_cpufreq.c + + 01 static int est_power(unsigned long *mW, unsigned long *KHz, int cpu) + 02 { + 03 long freq, power; + 04 + 05 /* Use the 'foo' protocol to ceil the frequency */ + 06 freq = foo_get_freq_ceil(cpu, *KHz); + 07 if (freq < 0); + 08 return freq; + 09 + 10 /* Estimate the power cost for the CPU at the relevant freq. */ + 11 power = foo_estimate_power(cpu, freq); + 12 if (power < 0); + 13 return power; + 14 + 15 /* Return the values to the EM framework */ + 16 *mW = power; + 17 *KHz = freq; + 18 + 19 return 0; + 20 } + 21 + 22 static int foo_cpufreq_init(struct cpufreq_policy *policy) + 23 { + 24 struct em_data_callback em_cb = EM_DATA_CB(est_power); + 25 int nr_opp, ret; + 26 + 27 /* Do the actual CPUFreq init work ... */ + 28 ret = do_foo_cpufreq_init(policy); + 29 if (ret) + 30 return ret; + 31 + 32 /* Find the number of OPPs for this policy */ + 33 nr_opp = foo_get_nr_opp(policy); + 34 + 35 /* And register the new performance domain */ + 36 em_register_perf_domain(policy->cpus, nr_opp, &em_cb); + 37 + 38 return 0; + 39 } diff --git a/Documentation/power/freezing-of-tasks.txt b/Documentation/power/freezing-of-tasks.rst index cd283190855a..ef110fe55e82 100644 --- a/Documentation/power/freezing-of-tasks.txt +++ b/Documentation/power/freezing-of-tasks.rst @@ -1,13 +1,18 @@ +================= Freezing of tasks - (C) 2007 Rafael J. Wysocki <rjw@sisk.pl>, GPL +================= + +(C) 2007 Rafael J. Wysocki <rjw@sisk.pl>, GPL I. What is the freezing of tasks? +================================= The freezing of tasks is a mechanism by which user space processes and some kernel threads are controlled during hibernation or system-wide suspend (on some architectures). II. How does it work? +===================== There are three per-task flags used for that, PF_NOFREEZE, PF_FROZEN and PF_FREEZER_SKIP (the last one is auxiliary). The tasks that have @@ -41,7 +46,7 @@ explicitly in suitable places or use the wait_event_freezable() or wait_event_freezable_timeout() macros (defined in include/linux/freezer.h) that combine interruptible sleep with checking if the task is to be frozen and calling try_to_freeze(). The main loop of a freezable kernel thread may look -like the following one: +like the following one:: set_freezable(); do { @@ -65,7 +70,7 @@ order to clear the PF_FROZEN flag for each frozen task. Then, the tasks that have been frozen leave __refrigerator() and continue running. -Rationale behind the functions dealing with freezing and thawing of tasks: +Rationale behind the functions dealing with freezing and thawing of tasks ------------------------------------------------------------------------- freeze_processes(): @@ -86,6 +91,7 @@ thaw_processes(): III. Which kernel threads are freezable? +======================================== Kernel threads are not freezable by default. However, a kernel thread may clear PF_NOFREEZE for itself by calling set_freezable() (the resetting of PF_NOFREEZE @@ -93,37 +99,39 @@ directly is not allowed). From this point it is regarded as freezable and must call try_to_freeze() in a suitable place. IV. Why do we do that? +====================== Generally speaking, there is a couple of reasons to use the freezing of tasks: 1. The principal reason is to prevent filesystems from being damaged after -hibernation. At the moment we have no simple means of checkpointing -filesystems, so if there are any modifications made to filesystem data and/or -metadata on disks, we cannot bring them back to the state from before the -modifications. At the same time each hibernation image contains some -filesystem-related information that must be consistent with the state of the -on-disk data and metadata after the system memory state has been restored from -the image (otherwise the filesystems will be damaged in a nasty way, usually -making them almost impossible to repair). We therefore freeze tasks that might -cause the on-disk filesystems' data and metadata to be modified after the -hibernation image has been created and before the system is finally powered off. -The majority of these are user space processes, but if any of the kernel threads -may cause something like this to happen, they have to be freezable. + hibernation. At the moment we have no simple means of checkpointing + filesystems, so if there are any modifications made to filesystem data and/or + metadata on disks, we cannot bring them back to the state from before the + modifications. At the same time each hibernation image contains some + filesystem-related information that must be consistent with the state of the + on-disk data and metadata after the system memory state has been restored + from the image (otherwise the filesystems will be damaged in a nasty way, + usually making them almost impossible to repair). We therefore freeze + tasks that might cause the on-disk filesystems' data and metadata to be + modified after the hibernation image has been created and before the + system is finally powered off. The majority of these are user space + processes, but if any of the kernel threads may cause something like this + to happen, they have to be freezable. 2. Next, to create the hibernation image we need to free a sufficient amount of -memory (approximately 50% of available RAM) and we need to do that before -devices are deactivated, because we generally need them for swapping out. Then, -after the memory for the image has been freed, we don't want tasks to allocate -additional memory and we prevent them from doing that by freezing them earlier. -[Of course, this also means that device drivers should not allocate substantial -amounts of memory from their .suspend() callbacks before hibernation, but this -is a separate issue.] + memory (approximately 50% of available RAM) and we need to do that before + devices are deactivated, because we generally need them for swapping out. + Then, after the memory for the image has been freed, we don't want tasks + to allocate additional memory and we prevent them from doing that by + freezing them earlier. [Of course, this also means that device drivers + should not allocate substantial amounts of memory from their .suspend() + callbacks before hibernation, but this is a separate issue.] 3. The third reason is to prevent user space processes and some kernel threads -from interfering with the suspending and resuming of devices. A user space -process running on a second CPU while we are suspending devices may, for -example, be troublesome and without the freezing of tasks we would need some -safeguards against race conditions that might occur in such a case. + from interfering with the suspending and resuming of devices. A user space + process running on a second CPU while we are suspending devices may, for + example, be troublesome and without the freezing of tasks we would need some + safeguards against race conditions that might occur in such a case. Although Linus Torvalds doesn't like the freezing of tasks, he said this in one of the discussions on LKML (http://lkml.org/lkml/2007/4/27/608): @@ -132,7 +140,7 @@ of the discussions on LKML (http://lkml.org/lkml/2007/4/27/608): Linus: In many ways, 'at all'. -I _do_ realize the IO request queue issues, and that we cannot actually do +I **do** realize the IO request queue issues, and that we cannot actually do s2ram with some devices in the middle of a DMA. So we want to be able to avoid *that*, there's no question about that. And I suspect that stopping user threads and then waiting for a sync is practically one of the easier @@ -150,17 +158,18 @@ thawed after the driver's .resume() callback has run, so it won't be accessing the device while it's suspended. 4. Another reason for freezing tasks is to prevent user space processes from -realizing that hibernation (or suspend) operation takes place. Ideally, user -space processes should not notice that such a system-wide operation has occurred -and should continue running without any problems after the restore (or resume -from suspend). Unfortunately, in the most general case this is quite difficult -to achieve without the freezing of tasks. Consider, for example, a process -that depends on all CPUs being online while it's running. Since we need to -disable nonboot CPUs during the hibernation, if this process is not frozen, it -may notice that the number of CPUs has changed and may start to work incorrectly -because of that. + realizing that hibernation (or suspend) operation takes place. Ideally, user + space processes should not notice that such a system-wide operation has + occurred and should continue running without any problems after the restore + (or resume from suspend). Unfortunately, in the most general case this + is quite difficult to achieve without the freezing of tasks. Consider, + for example, a process that depends on all CPUs being online while it's + running. Since we need to disable nonboot CPUs during the hibernation, + if this process is not frozen, it may notice that the number of CPUs has + changed and may start to work incorrectly because of that. V. Are there any problems related to the freezing of tasks? +=========================================================== Yes, there are. @@ -172,11 +181,12 @@ may be undesirable. That's why kernel threads are not freezable by default. Second, there are the following two problems related to the freezing of user space processes: + 1. Putting processes into an uninterruptible sleep distorts the load average. 2. Now that we have FUSE, plus the framework for doing device drivers in -userspace, it gets even more complicated because some userspace processes are -now doing the sorts of things that kernel threads do -(https://lists.linux-foundation.org/pipermail/linux-pm/2007-May/012309.html). + userspace, it gets even more complicated because some userspace processes are + now doing the sorts of things that kernel threads do + (https://lists.linux-foundation.org/pipermail/linux-pm/2007-May/012309.html). The problem 1. seems to be fixable, although it hasn't been fixed so far. The other one is more serious, but it seems that we can work around it by using @@ -201,6 +211,7 @@ requested early enough using the suspend notifier API described in Documentation/driver-api/pm/notifiers.rst. VI. Are there any precautions to be taken to prevent freezing failures? +======================================================================= Yes, there are. @@ -226,6 +237,8 @@ So, to summarize, use [un]lock_system_sleep() instead of directly using mutex_[un]lock(&system_transition_mutex). That would prevent freezing failures. V. Miscellaneous +================ + /sys/power/pm_freeze_timeout controls how long it will cost at most to freeze all user space processes or all freezable kernel threads, in unit of millisecond. The default value is 20000, with range of unsigned integer. diff --git a/Documentation/power/index.rst b/Documentation/power/index.rst new file mode 100644 index 000000000000..20415f21e48a --- /dev/null +++ b/Documentation/power/index.rst @@ -0,0 +1,46 @@ +:orphan: + +================ +Power Management +================ + +.. toctree:: + :maxdepth: 1 + + apm-acpi + basic-pm-debugging + charger-manager + drivers-testing + energy-model + freezing-of-tasks + interface + opp + pci + pm_qos_interface + power_supply_class + runtime_pm + s2ram + suspend-and-cpuhotplug + suspend-and-interrupts + swsusp-and-swap-files + swsusp-dmcrypt + swsusp + video + tricks + + userland-swsusp + + powercap/powercap + + regulator/consumer + regulator/design + regulator/machine + regulator/overview + regulator/regulator + +.. only:: subproject and html + + Indices + ======= + + * :ref:`genindex` diff --git a/Documentation/power/interface.txt b/Documentation/power/interface.rst index 27df7f98668a..8d270ed27228 100644 --- a/Documentation/power/interface.txt +++ b/Documentation/power/interface.rst @@ -1,4 +1,6 @@ +=========================================== Power Management Interface for System Sleep +=========================================== Copyright (c) 2016 Intel Corp., Rafael J. Wysocki <rafael.j.wysocki@intel.com> @@ -11,10 +13,10 @@ mounted at /sys). Reading from it returns a list of supported sleep states, encoded as: -'freeze' (Suspend-to-Idle) -'standby' (Power-On Suspend) -'mem' (Suspend-to-RAM) -'disk' (Suspend-to-Disk) +- 'freeze' (Suspend-to-Idle) +- 'standby' (Power-On Suspend) +- 'mem' (Suspend-to-RAM) +- 'disk' (Suspend-to-Disk) Suspend-to-Idle is always supported. Suspend-to-Disk is always supported too as long the kernel has been configured to support hibernation at all @@ -32,18 +34,18 @@ Specifically, it tells the kernel what to do after creating a hibernation image. Reading from it returns a list of supported options encoded as: -'platform' (put the system into sleep using a platform-provided method) -'shutdown' (shut the system down) -'reboot' (reboot the system) -'suspend' (trigger a Suspend-to-RAM transition) -'test_resume' (resume-after-hibernation test mode) +- 'platform' (put the system into sleep using a platform-provided method) +- 'shutdown' (shut the system down) +- 'reboot' (reboot the system) +- 'suspend' (trigger a Suspend-to-RAM transition) +- 'test_resume' (resume-after-hibernation test mode) The currently selected option is printed in square brackets. The 'platform' option is only available if the platform provides a special mechanism to put the system to sleep after creating a hibernation image (ACPI does that, for example). The 'suspend' option is available if Suspend-to-RAM -is supported. Refer to Documentation/power/basic-pm-debugging.txt for the +is supported. Refer to Documentation/power/basic-pm-debugging.rst for the description of the 'test_resume' option. To select an option, write the string representing it to /sys/power/disk. @@ -71,7 +73,7 @@ If /sys/power/pm_trace contains '1', the fingerprint of each suspend/resume event point in turn will be stored in the RTC memory (overwriting the actual RTC information), so it will survive a system crash if one occurs right after storing it and it can be used later to identify the driver that caused the crash -to happen (see Documentation/power/s2ram.txt for more information). +to happen (see Documentation/power/s2ram.rst for more information). Initially it contains '0' which may be changed to '1' by writing a string representing a nonzero integer into it. diff --git a/Documentation/power/opp.txt b/Documentation/power/opp.rst index 0c007e250cd1..b3cf1def9dee 100644 --- a/Documentation/power/opp.txt +++ b/Documentation/power/opp.rst @@ -1,20 +1,23 @@ +========================================== Operating Performance Points (OPP) Library ========================================== (C) 2009-2010 Nishanth Menon <nm@ti.com>, Texas Instruments Incorporated -Contents --------- -1. Introduction -2. Initial OPP List Registration -3. OPP Search Functions -4. OPP Availability Control Functions -5. OPP Data Retrieval Functions -6. Data Structures +.. Contents + + 1. Introduction + 2. Initial OPP List Registration + 3. OPP Search Functions + 4. OPP Availability Control Functions + 5. OPP Data Retrieval Functions + 6. Data Structures 1. Introduction =============== + 1.1 What is an Operating Performance Point (OPP)? +------------------------------------------------- Complex SoCs of today consists of a multiple sub-modules working in conjunction. In an operational system executing varied use cases, not all modules in the SoC @@ -28,16 +31,19 @@ the device will support per domain are called Operating Performance Points or OPPs. As an example: + Let us consider an MPU device which supports the following: {300MHz at minimum voltage of 1V}, {800MHz at minimum voltage of 1.2V}, {1GHz at minimum voltage of 1.3V} We can represent these as three OPPs as the following {Hz, uV} tuples: -{300000000, 1000000} -{800000000, 1200000} -{1000000000, 1300000} + +- {300000000, 1000000} +- {800000000, 1200000} +- {1000000000, 1300000} 1.2 Operating Performance Points Library +---------------------------------------- OPP library provides a set of helper functions to organize and query the OPP information. The library is located in drivers/base/power/opp.c and the header @@ -46,9 +52,10 @@ CONFIG_PM_OPP from power management menuconfig menu. OPP library depends on CONFIG_PM as certain SoCs such as Texas Instrument's OMAP framework allows to optionally boot at a certain OPP without needing cpufreq. -Typical usage of the OPP library is as follows: -(users) -> registers a set of default OPPs -> (library) -SoC framework -> modifies on required cases certain OPPs -> OPP layer +Typical usage of the OPP library is as follows:: + + (users) -> registers a set of default OPPs -> (library) + SoC framework -> modifies on required cases certain OPPs -> OPP layer -> queries to search/retrieve information -> OPP layer expects each domain to be represented by a unique device pointer. SoC @@ -57,8 +64,9 @@ list is expected to be an optimally small number typically around 5 per device. This initial list contains a set of OPPs that the framework expects to be safely enabled by default in the system. -Note on OPP Availability: ------------------------- +Note on OPP Availability +^^^^^^^^^^^^^^^^^^^^^^^^ + As the system proceeds to operate, SoC framework may choose to make certain OPPs available or not available on each device based on various external factors. Example usage: Thermal management or other exceptional situations where @@ -88,7 +96,8 @@ registering the OPPs is maintained by OPP library throughout the device operation. The SoC framework can subsequently control the availability of the OPPs dynamically using the dev_pm_opp_enable / disable functions. -dev_pm_opp_add - Add a new OPP for a specific domain represented by the device pointer. +dev_pm_opp_add + Add a new OPP for a specific domain represented by the device pointer. The OPP is defined using the frequency and voltage. Once added, the OPP is assumed to be available and control of it's availability can be done with the dev_pm_opp_enable/disable functions. OPP library internally stores @@ -96,9 +105,11 @@ dev_pm_opp_add - Add a new OPP for a specific domain represented by the device p used by SoC framework to define a optimal list as per the demands of SoC usage environment. - WARNING: Do not use this function in interrupt context. + WARNING: + Do not use this function in interrupt context. + + Example:: - Example: soc_pm_init() { /* Do things */ @@ -125,12 +136,15 @@ Callers of these functions shall call dev_pm_opp_put() after they have used the OPP. Otherwise the memory for the OPP will never get freed and result in memleak. -dev_pm_opp_find_freq_exact - Search for an OPP based on an *exact* frequency and +dev_pm_opp_find_freq_exact + Search for an OPP based on an *exact* frequency and availability. This function is especially useful to enable an OPP which is not available by default. Example: In a case when SoC framework detects a situation where a higher frequency could be made available, it can use this function to - find the OPP prior to call the dev_pm_opp_enable to actually make it available. + find the OPP prior to call the dev_pm_opp_enable to actually make + it available:: + opp = dev_pm_opp_find_freq_exact(dev, 1000000000, false); dev_pm_opp_put(opp); /* dont operate on the pointer.. just do a sanity check.. */ @@ -141,27 +155,34 @@ dev_pm_opp_find_freq_exact - Search for an OPP based on an *exact* frequency and dev_pm_opp_enable(dev,1000000000); } - NOTE: This is the only search function that operates on OPPs which are - not available. + NOTE: + This is the only search function that operates on OPPs which are + not available. -dev_pm_opp_find_freq_floor - Search for an available OPP which is *at most* the +dev_pm_opp_find_freq_floor + Search for an available OPP which is *at most* the provided frequency. This function is useful while searching for a lesser match OR operating on OPP information in the order of decreasing frequency. - Example: To find the highest opp for a device: + Example: To find the highest opp for a device:: + freq = ULONG_MAX; opp = dev_pm_opp_find_freq_floor(dev, &freq); dev_pm_opp_put(opp); -dev_pm_opp_find_freq_ceil - Search for an available OPP which is *at least* the +dev_pm_opp_find_freq_ceil + Search for an available OPP which is *at least* the provided frequency. This function is useful while searching for a higher match OR operating on OPP information in the order of increasing frequency. - Example 1: To find the lowest opp for a device: + Example 1: To find the lowest opp for a device:: + freq = 0; opp = dev_pm_opp_find_freq_ceil(dev, &freq); dev_pm_opp_put(opp); - Example 2: A simplified implementation of a SoC cpufreq_driver->target: + + Example 2: A simplified implementation of a SoC cpufreq_driver->target:: + soc_cpufreq_target(..) { /* Do stuff like policy checks etc. */ @@ -184,12 +205,15 @@ fine grained dynamic control of which sets of OPPs are operationally available. These functions are intended to *temporarily* remove an OPP in conditions such as thermal considerations (e.g. don't use OPPx until the temperature drops). -WARNING: Do not use these functions in interrupt context. +WARNING: + Do not use these functions in interrupt context. -dev_pm_opp_enable - Make a OPP available for operation. +dev_pm_opp_enable + Make a OPP available for operation. Example: Lets say that 1GHz OPP is to be made available only if the SoC temperature is lower than a certain threshold. The SoC framework - implementation might choose to do something as follows: + implementation might choose to do something as follows:: + if (cur_temp < temp_low_thresh) { /* Enable 1GHz if it was disabled */ opp = dev_pm_opp_find_freq_exact(dev, 1000000000, false); @@ -201,10 +225,12 @@ dev_pm_opp_enable - Make a OPP available for operation. goto try_something_else; } -dev_pm_opp_disable - Make an OPP to be not available for operation +dev_pm_opp_disable + Make an OPP to be not available for operation Example: Lets say that 1GHz OPP is to be disabled if the temperature exceeds a threshold value. The SoC framework implementation might - choose to do something as follows: + choose to do something as follows:: + if (cur_temp > temp_high_thresh) { /* Disable 1GHz if it was enabled */ opp = dev_pm_opp_find_freq_exact(dev, 1000000000, true); @@ -223,11 +249,13 @@ information from the OPP structure is necessary. Once an OPP pointer is retrieved using the search functions, the following functions can be used by SoC framework to retrieve the information represented inside the OPP layer. -dev_pm_opp_get_voltage - Retrieve the voltage represented by the opp pointer. +dev_pm_opp_get_voltage + Retrieve the voltage represented by the opp pointer. Example: At a cpufreq transition to a different frequency, SoC framework requires to set the voltage represented by the OPP using the regulator framework to the Power Management chip providing the - voltage. + voltage:: + soc_switch_to_freq_voltage(freq) { /* do things */ @@ -239,10 +267,12 @@ dev_pm_opp_get_voltage - Retrieve the voltage represented by the opp pointer. /* do other things */ } -dev_pm_opp_get_freq - Retrieve the freq represented by the opp pointer. +dev_pm_opp_get_freq + Retrieve the freq represented by the opp pointer. Example: Lets say the SoC framework uses a couple of helper functions we could pass opp pointers instead of doing additional parameters to - handle quiet a bit of data parameters. + handle quiet a bit of data parameters:: + soc_cpufreq_target(..) { /* do things.. */ @@ -264,9 +294,11 @@ dev_pm_opp_get_freq - Retrieve the freq represented by the opp pointer. /* do things.. */ } -dev_pm_opp_get_opp_count - Retrieve the number of available opps for a device +dev_pm_opp_get_opp_count + Retrieve the number of available opps for a device Example: Lets say a co-processor in the SoC needs to know the available - frequencies in a table, the main processor can notify as following: + frequencies in a table, the main processor can notify as following:: + soc_notify_coproc_available_frequencies() { /* Do things */ @@ -289,54 +321,59 @@ dev_pm_opp_get_opp_count - Retrieve the number of available opps for a device ================== Typically an SoC contains multiple voltage domains which are variable. Each domain is represented by a device pointer. The relationship to OPP can be -represented as follows: -SoC - |- device 1 - | |- opp 1 (availability, freq, voltage) - | |- opp 2 .. - ... ... - | `- opp n .. - |- device 2 - ... - `- device m +represented as follows:: + + SoC + |- device 1 + | |- opp 1 (availability, freq, voltage) + | |- opp 2 .. + ... ... + | `- opp n .. + |- device 2 + ... + `- device m OPP library maintains a internal list that the SoC framework populates and accessed by various functions as described above. However, the structures representing the actual OPPs and domains are internal to the OPP library itself to allow for suitable abstraction reusable across systems. -struct dev_pm_opp - The internal data structure of OPP library which is used to +struct dev_pm_opp + The internal data structure of OPP library which is used to represent an OPP. In addition to the freq, voltage, availability information, it also contains internal book keeping information required for the OPP library to operate on. Pointer to this structure is provided back to the users such as SoC framework to be used as a identifier for OPP in the interactions with OPP layer. - WARNING: The struct dev_pm_opp pointer should not be parsed or modified by the - users. The defaults of for an instance is populated by dev_pm_opp_add, but the - availability of the OPP can be modified by dev_pm_opp_enable/disable functions. + WARNING: + The struct dev_pm_opp pointer should not be parsed or modified by the + users. The defaults of for an instance is populated by + dev_pm_opp_add, but the availability of the OPP can be modified + by dev_pm_opp_enable/disable functions. -struct device - This is used to identify a domain to the OPP layer. The +struct device + This is used to identify a domain to the OPP layer. The nature of the device and it's implementation is left to the user of OPP library such as the SoC framework. Overall, in a simplistic view, the data structure operations is represented as -following: +following:: -Initialization / modification: - +-----+ /- dev_pm_opp_enable -dev_pm_opp_add --> | opp | <------- - | +-----+ \- dev_pm_opp_disable - \-------> domain_info(device) + Initialization / modification: + +-----+ /- dev_pm_opp_enable + dev_pm_opp_add --> | opp | <------- + | +-----+ \- dev_pm_opp_disable + \-------> domain_info(device) -Search functions: - /-- dev_pm_opp_find_freq_ceil ---\ +-----+ -domain_info<---- dev_pm_opp_find_freq_exact -----> | opp | - \-- dev_pm_opp_find_freq_floor ---/ +-----+ + Search functions: + /-- dev_pm_opp_find_freq_ceil ---\ +-----+ + domain_info<---- dev_pm_opp_find_freq_exact -----> | opp | + \-- dev_pm_opp_find_freq_floor ---/ +-----+ -Retrieval functions: -+-----+ /- dev_pm_opp_get_voltage -| opp | <--- -+-----+ \- dev_pm_opp_get_freq + Retrieval functions: + +-----+ /- dev_pm_opp_get_voltage + | opp | <--- + +-----+ \- dev_pm_opp_get_freq -domain_info <- dev_pm_opp_get_opp_count + domain_info <- dev_pm_opp_get_opp_count diff --git a/Documentation/power/pci.txt b/Documentation/power/pci.rst index 8eaf9ee24d43..0e2ef7429304 100644 --- a/Documentation/power/pci.txt +++ b/Documentation/power/pci.rst @@ -1,4 +1,6 @@ +==================== PCI Power Management +==================== Copyright (c) 2010 Rafael J. Wysocki <rjw@sisk.pl>, Novell Inc. @@ -9,14 +11,14 @@ management. Based on previous work by Patrick Mochel <mochel@transmeta.com> This document only covers the aspects of power management specific to PCI devices. For general description of the kernel's interfaces related to device power management refer to Documentation/driver-api/pm/devices.rst and -Documentation/power/runtime_pm.txt. +Documentation/power/runtime_pm.rst. ---------------------------------------------------------------------------- +.. contents: -1. Hardware and Platform Support for PCI Power Management -2. PCI Subsystem and Device Power Management -3. PCI Device Drivers and Power Management -4. Resources + 1. Hardware and Platform Support for PCI Power Management + 2. PCI Subsystem and Device Power Management + 3. PCI Device Drivers and Power Management + 4. Resources 1. Hardware and Platform Support for PCI Power Management @@ -24,6 +26,7 @@ Documentation/power/runtime_pm.txt. 1.1. Native and Platform-Based Power Management ----------------------------------------------- + In general, power management is a feature allowing one to save energy by putting devices into states in which they draw less power (low-power states) at the price of reduced functionality or performance. @@ -67,6 +70,7 @@ mechanisms have to be used simultaneously to obtain the desired result. 1.2. Native PCI Power Management -------------------------------- + The PCI Bus Power Management Interface Specification (PCI PM Spec) was introduced between the PCI 2.1 and PCI 2.2 Specifications. It defined a standard interface for performing various operations related to power @@ -134,6 +138,7 @@ sufficiently active to generate a wakeup signal. 1.3. ACPI Device Power Management --------------------------------- + The platform firmware support for the power management of PCI devices is system-specific. However, if the system in question is compliant with the Advanced Configuration and Power Interface (ACPI) Specification, like the @@ -194,6 +199,7 @@ enabled for the device to be able to generate wakeup signals. 1.4. Wakeup Signaling --------------------- + Wakeup signals generated by PCI devices, either as native PCI PMEs, or as a result of the execution of the _DSW (or _PSW) ACPI control method before putting the device into a low-power state, have to be caught and handled as @@ -265,14 +271,15 @@ the native PCI Express PME signaling cannot be used by the kernel in that case. 2.1. Device Power Management Callbacks -------------------------------------- + The PCI Subsystem participates in the power management of PCI devices in a number of ways. First of all, it provides an intermediate code layer between the device power management core (PM core) and PCI device drivers. Specifically, the pm field of the PCI subsystem's struct bus_type object, pci_bus_type, points to a struct dev_pm_ops object, pci_dev_pm_ops, containing -pointers to several device power management callbacks: +pointers to several device power management callbacks:: -const struct dev_pm_ops pci_dev_pm_ops = { + const struct dev_pm_ops pci_dev_pm_ops = { .prepare = pci_pm_prepare, .complete = pci_pm_complete, .suspend = pci_pm_suspend, @@ -290,7 +297,7 @@ const struct dev_pm_ops pci_dev_pm_ops = { .runtime_suspend = pci_pm_runtime_suspend, .runtime_resume = pci_pm_runtime_resume, .runtime_idle = pci_pm_runtime_idle, -}; + }; These callbacks are executed by the PM core in various situations related to device power management and they, in turn, execute power management callbacks @@ -299,9 +306,9 @@ involving some standard configuration registers of PCI devices that device drivers need not know or care about. The structure representing a PCI device, struct pci_dev, contains several fields -that these callbacks operate on: +that these callbacks operate on:: -struct pci_dev { + struct pci_dev { ... pci_power_t current_state; /* Current operating state. */ int pm_cap; /* PM capability offset in the @@ -315,13 +322,14 @@ struct pci_dev { unsigned int wakeup_prepared:1; /* Device prepared for wake up */ unsigned int d3_delay; /* D3->D0 transition time in ms */ ... -}; + }; They also indirectly use some fields of the struct device that is embedded in struct pci_dev. 2.2. Device Initialization -------------------------- + The PCI subsystem's first task related to device power management is to prepare the device for power management and initialize the fields of struct pci_dev used for this purpose. This happens in two functions defined in @@ -348,10 +356,11 @@ during system-wide transitions to a sleep state and back to the working state. 2.3. Runtime Device Power Management ------------------------------------ + The PCI subsystem plays a vital role in the runtime power management of PCI devices. For this purpose it uses the general runtime power management -(runtime PM) framework described in Documentation/power/runtime_pm.txt. -Namely, it provides subsystem-level callbacks: +(runtime PM) framework described in Documentation/power/runtime_pm.rst. +Namely, it provides subsystem-level callbacks:: pci_pm_runtime_suspend() pci_pm_runtime_resume() @@ -425,13 +434,14 @@ to the given subsystem before the next phase begins. These phases always run after tasks have been frozen. 2.4.1. System Suspend +^^^^^^^^^^^^^^^^^^^^^ When the system is going into a sleep state in which the contents of memory will be preserved, such as one of the ACPI sleep states S1-S3, the phases are: prepare, suspend, suspend_noirq. -The following PCI bus type's callbacks, respectively, are used in these phases: +The following PCI bus type's callbacks, respectively, are used in these phases:: pci_pm_prepare() pci_pm_suspend() @@ -492,6 +502,7 @@ this purpose). PCI device drivers are not encouraged to do that, but in some rare cases doing that in the driver may be the optimum approach. 2.4.2. System Resume +^^^^^^^^^^^^^^^^^^^^ When the system is undergoing a transition from a sleep state in which the contents of memory have been preserved, such as one of the ACPI sleep states @@ -500,7 +511,7 @@ S1-S3, into the working state (ACPI S0), the phases are: resume_noirq, resume, complete. The following PCI bus type's callbacks, respectively, are executed in these -phases: +phases:: pci_pm_resume_noirq() pci_pm_resume() @@ -539,6 +550,7 @@ The pci_pm_complete() routine only executes the device driver's pm->complete() callback, if defined. 2.4.3. System Hibernation +^^^^^^^^^^^^^^^^^^^^^^^^^ System hibernation is more complicated than system suspend, because it requires a system image to be created and written into a persistent storage medium. The @@ -551,7 +563,7 @@ to be free) in the following three phases: prepare, freeze, freeze_noirq -that correspond to the PCI bus type's callbacks: +that correspond to the PCI bus type's callbacks:: pci_pm_prepare() pci_pm_freeze() @@ -580,7 +592,7 @@ back to the fully functional state and this is done in the following phases: thaw_noirq, thaw, complete -using the following PCI bus type's callbacks: +using the following PCI bus type's callbacks:: pci_pm_thaw_noirq() pci_pm_thaw() @@ -608,7 +620,7 @@ three phases: where the prepare phase is exactly the same as for system suspend. The other two phases are analogous to the suspend and suspend_noirq phases, respectively. -The PCI subsystem-level callbacks they correspond to +The PCI subsystem-level callbacks they correspond to:: pci_pm_poweroff() pci_pm_poweroff_noirq() @@ -618,6 +630,7 @@ although they don't attempt to save the device's standard configuration registers. 2.4.4. System Restore +^^^^^^^^^^^^^^^^^^^^^ System restore requires a hibernation image to be loaded into memory and the pre-hibernation memory contents to be restored before the pre-hibernation system @@ -653,7 +666,7 @@ phases: The first two of these are analogous to the resume_noirq and resume phases described above, respectively, and correspond to the following PCI subsystem -callbacks: +callbacks:: pci_pm_restore_noirq() pci_pm_restore() @@ -671,6 +684,7 @@ resume. 3.1. Power Management Callbacks ------------------------------- + PCI device drivers participate in power management by providing callbacks to be executed by the PCI subsystem's power management routines described above and by controlling the runtime power management of their devices. @@ -698,6 +712,7 @@ defined, though, they are expected to behave as described in the following subsections. 3.1.1. prepare() +^^^^^^^^^^^^^^^^ The prepare() callback is executed during system suspend, during hibernation (when a hibernation image is about to be created), during power-off after @@ -716,6 +731,7 @@ preallocated earlier, for example in a suspend/hibernate notifier as described in Documentation/driver-api/pm/notifiers.rst). 3.1.2. suspend() +^^^^^^^^^^^^^^^^ The suspend() callback is only executed during system suspend, after prepare() callbacks have been executed for all devices in the system. @@ -742,6 +758,7 @@ operations relying on the driver's ability to handle interrupts should be carried out in this callback. 3.1.3. suspend_noirq() +^^^^^^^^^^^^^^^^^^^^^^ The suspend_noirq() callback is only executed during system suspend, after suspend() callbacks have been executed for all devices in the system and @@ -753,6 +770,7 @@ suspend_noirq() can carry out operations that would cause race conditions to arise if they were performed in suspend(). 3.1.4. freeze() +^^^^^^^^^^^^^^^ The freeze() callback is hibernation-specific and is executed in two situations, during hibernation, after prepare() callbacks have been executed for all devices @@ -770,6 +788,7 @@ or put it into a low-power state. Still, either it or freeze_noirq() should save the device's standard configuration registers using pci_save_state(). 3.1.5. freeze_noirq() +^^^^^^^^^^^^^^^^^^^^^ The freeze_noirq() callback is hibernation-specific. It is executed during hibernation, after prepare() and freeze() callbacks have been executed for all @@ -786,6 +805,7 @@ The difference between freeze_noirq() and freeze() is analogous to the difference between suspend_noirq() and suspend(). 3.1.6. poweroff() +^^^^^^^^^^^^^^^^^ The poweroff() callback is hibernation-specific. It is executed when the system is about to be powered off after saving a hibernation image to a persistent @@ -802,6 +822,7 @@ into a low-power state, respectively, but it need not save the device's standard configuration registers. 3.1.7. poweroff_noirq() +^^^^^^^^^^^^^^^^^^^^^^^ The poweroff_noirq() callback is hibernation-specific. It is executed after poweroff() callbacks have been executed for all devices in the system. @@ -814,6 +835,7 @@ The difference between poweroff_noirq() and poweroff() is analogous to the difference between suspend_noirq() and suspend(). 3.1.8. resume_noirq() +^^^^^^^^^^^^^^^^^^^^^ The resume_noirq() callback is only executed during system resume, after the PM core has enabled the non-boot CPUs. The driver's interrupt handler will not @@ -827,6 +849,7 @@ it should only be used for performing operations that would lead to race conditions if carried out by resume(). 3.1.9. resume() +^^^^^^^^^^^^^^^ The resume() callback is only executed during system resume, after resume_noirq() callbacks have been executed for all devices in the system and @@ -837,6 +860,7 @@ device and bringing it back to the fully functional state. The device should be able to process I/O in a usual way after resume() has returned. 3.1.10. thaw_noirq() +^^^^^^^^^^^^^^^^^^^^ The thaw_noirq() callback is hibernation-specific. It is executed after a system image has been created and the non-boot CPUs have been enabled by the PM @@ -851,6 +875,7 @@ freeze() and freeze_noirq(), so in general it does not need to modify the contents of the device's registers. 3.1.11. thaw() +^^^^^^^^^^^^^^ The thaw() callback is hibernation-specific. It is executed after thaw_noirq() callbacks have been executed for all devices in the system and after device @@ -860,6 +885,7 @@ This callback is responsible for restoring the pre-freeze configuration of the device, so that it will work in a usual way after thaw() has returned. 3.1.12. restore_noirq() +^^^^^^^^^^^^^^^^^^^^^^^ The restore_noirq() callback is hibernation-specific. It is executed in the restore_noirq phase of hibernation, when the boot kernel has passed control to @@ -875,6 +901,7 @@ For the vast majority of PCI device drivers there is no difference between resume_noirq() and restore_noirq(). 3.1.13. restore() +^^^^^^^^^^^^^^^^^ The restore() callback is hibernation-specific. It is executed after restore_noirq() callbacks have been executed for all devices in the system and @@ -888,14 +915,17 @@ For the vast majority of PCI device drivers there is no difference between resume() and restore(). 3.1.14. complete() +^^^^^^^^^^^^^^^^^^ The complete() callback is executed in the following situations: + - during system resume, after resume() callbacks have been executed for all devices, - during hibernation, before saving the system image, after thaw() callbacks have been executed for all devices, - during system restore, when the system is going back to its pre-hibernation state, after restore() callbacks have been executed for all devices. + It also may be executed if the loading of a hibernation image into memory fails (in that case it is run after thaw() callbacks have been executed for all devices that have drivers in the boot kernel). @@ -904,6 +934,7 @@ This callback is entirely optional, although it may be necessary if the prepare() callback performs operations that need to be reversed. 3.1.15. runtime_suspend() +^^^^^^^^^^^^^^^^^^^^^^^^^ The runtime_suspend() callback is specific to device runtime power management (runtime PM). It is executed by the PM core's runtime PM framework when the @@ -915,6 +946,7 @@ put into a low-power state, but it must allow the PCI subsystem to perform all of the PCI-specific actions necessary for suspending the device. 3.1.16. runtime_resume() +^^^^^^^^^^^^^^^^^^^^^^^^ The runtime_resume() callback is specific to device runtime PM. It is executed by the PM core's runtime PM framework when the device is about to be resumed @@ -927,6 +959,7 @@ The device is expected to be able to process I/O in the usual way after runtime_resume() has returned. 3.1.17. runtime_idle() +^^^^^^^^^^^^^^^^^^^^^^ The runtime_idle() callback is specific to device runtime PM. It is executed by the PM core's runtime PM framework whenever it may be desirable to suspend @@ -939,6 +972,7 @@ PCI subsystem will call pm_runtime_suspend() for the device, which in turn will cause the driver's runtime_suspend() callback to be executed. 3.1.18. Pointing Multiple Callback Pointers to One Routine +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Although in principle each of the callbacks described in the previous subsections can be defined as a separate function, it often is convenient to @@ -962,6 +996,7 @@ dev_pm_ops to indicate that one suspend routine is to be pointed to by the be pointed to by the .resume(), .thaw(), and .restore() members. 3.1.19. Driver Flags for Power Management +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ The PM core allows device drivers to set flags that influence the handling of power management for the devices by the core itself and by middle layer code @@ -1007,6 +1042,7 @@ it. 3.2. Device Runtime Power Management ------------------------------------ + In addition to providing device power management callbacks PCI device drivers are responsible for controlling the runtime power management (runtime PM) of their devices. @@ -1073,22 +1109,27 @@ device the PM core automatically queues a request to check if the device is idle), device drivers are generally responsible for queuing power management requests for their devices. For this purpose they should use the runtime PM helper functions provided by the PM core, discussed in -Documentation/power/runtime_pm.txt. +Documentation/power/runtime_pm.rst. Devices can also be suspended and resumed synchronously, without placing a request into pm_wq. In the majority of cases this also is done by their drivers that use helper functions provided by the PM core for this purpose. For more information on the runtime PM of devices refer to -Documentation/power/runtime_pm.txt. +Documentation/power/runtime_pm.rst. 4. Resources ============ PCI Local Bus Specification, Rev. 3.0 + PCI Bus Power Management Interface Specification, Rev. 1.2 + Advanced Configuration and Power Interface (ACPI) Specification, Rev. 3.0b + PCI Express Base Specification, Rev. 2.0 + Documentation/driver-api/pm/devices.rst -Documentation/power/runtime_pm.txt + +Documentation/power/runtime_pm.rst diff --git a/Documentation/power/pm_qos_interface.txt b/Documentation/power/pm_qos_interface.rst index 19c5f7b1a7ba..945fc6d760c9 100644 --- a/Documentation/power/pm_qos_interface.txt +++ b/Documentation/power/pm_qos_interface.rst @@ -1,4 +1,6 @@ -PM Quality Of Service Interface. +=============================== +PM Quality Of Service Interface +=============================== This interface provides a kernel and user mode interface for registering performance expectations by drivers, subsystems and user space applications on @@ -11,6 +13,7 @@ memory_bandwidth. constraints and PM QoS flags. Each parameters have defined units: + * latency: usec * timeout: usec * throughput: kbs (kilo bit / sec) @@ -18,6 +21,7 @@ Each parameters have defined units: 1. PM QoS framework +=================== The infrastructure exposes multiple misc device nodes one per implemented parameter. The set of parameters implement is defined by pm_qos_power_init() @@ -37,38 +41,39 @@ reading the aggregated value does not require any locking mechanism. From kernel mode the use of this interface is simple: void pm_qos_add_request(handle, param_class, target_value): -Will insert an element into the list for that identified PM QoS class with the -target value. Upon change to this list the new target is recomputed and any -registered notifiers are called only if the target value is now different. -Clients of pm_qos need to save the returned handle for future use in other -pm_qos API functions. + Will insert an element into the list for that identified PM QoS class with the + target value. Upon change to this list the new target is recomputed and any + registered notifiers are called only if the target value is now different. + Clients of pm_qos need to save the returned handle for future use in other + pm_qos API functions. void pm_qos_update_request(handle, new_target_value): -Will update the list element pointed to by the handle with the new target value -and recompute the new aggregated target, calling the notification tree if the -target is changed. + Will update the list element pointed to by the handle with the new target value + and recompute the new aggregated target, calling the notification tree if the + target is changed. void pm_qos_remove_request(handle): -Will remove the element. After removal it will update the aggregate target and -call the notification tree if the target was changed as a result of removing -the request. + Will remove the element. After removal it will update the aggregate target and + call the notification tree if the target was changed as a result of removing + the request. int pm_qos_request(param_class): -Returns the aggregated value for a given PM QoS class. + Returns the aggregated value for a given PM QoS class. int pm_qos_request_active(handle): -Returns if the request is still active, i.e. it has not been removed from a -PM QoS class constraints list. + Returns if the request is still active, i.e. it has not been removed from a + PM QoS class constraints list. int pm_qos_add_notifier(param_class, notifier): -Adds a notification callback function to the PM QoS class. The callback is -called when the aggregated value for the PM QoS class is changed. + Adds a notification callback function to the PM QoS class. The callback is + called when the aggregated value for the PM QoS class is changed. int pm_qos_remove_notifier(int param_class, notifier): -Removes the notification callback function for the PM QoS class. + Removes the notification callback function for the PM QoS class. From user mode: + Only processes can register a pm_qos request. To provide for automatic cleanup of a process, the interface requires the process to register its parameter requests in the following way: @@ -89,6 +94,7 @@ node. 2. PM QoS per-device latency and flags framework +================================================ For each device, there are three lists of PM QoS requests. Two of them are maintained along with the aggregated targets of resume latency and active @@ -107,73 +113,80 @@ the aggregated value does not require any locking mechanism. From kernel mode the use of this interface is the following: int dev_pm_qos_add_request(device, handle, type, value): -Will insert an element into the list for that identified device with the -target value. Upon change to this list the new target is recomputed and any -registered notifiers are called only if the target value is now different. -Clients of dev_pm_qos need to save the handle for future use in other -dev_pm_qos API functions. + Will insert an element into the list for that identified device with the + target value. Upon change to this list the new target is recomputed and any + registered notifiers are called only if the target value is now different. + Clients of dev_pm_qos need to save the handle for future use in other + dev_pm_qos API functions. int dev_pm_qos_update_request(handle, new_value): -Will update the list element pointed to by the handle with the new target value -and recompute the new aggregated target, calling the notification trees if the -target is changed. + Will update the list element pointed to by the handle with the new target + value and recompute the new aggregated target, calling the notification + trees if the target is changed. int dev_pm_qos_remove_request(handle): -Will remove the element. After removal it will update the aggregate target and -call the notification trees if the target was changed as a result of removing -the request. + Will remove the element. After removal it will update the aggregate target + and call the notification trees if the target was changed as a result of + removing the request. s32 dev_pm_qos_read_value(device): -Returns the aggregated value for a given device's constraints list. + Returns the aggregated value for a given device's constraints list. enum pm_qos_flags_status dev_pm_qos_flags(device, mask) -Check PM QoS flags of the given device against the given mask of flags. -The meaning of the return values is as follows: - PM_QOS_FLAGS_ALL: All flags from the mask are set - PM_QOS_FLAGS_SOME: Some flags from the mask are set - PM_QOS_FLAGS_NONE: No flags from the mask are set - PM_QOS_FLAGS_UNDEFINED: The device's PM QoS structure has not been - initialized or the list of requests is empty. + Check PM QoS flags of the given device against the given mask of flags. + The meaning of the return values is as follows: + + PM_QOS_FLAGS_ALL: + All flags from the mask are set + PM_QOS_FLAGS_SOME: + Some flags from the mask are set + PM_QOS_FLAGS_NONE: + No flags from the mask are set + PM_QOS_FLAGS_UNDEFINED: + The device's PM QoS structure has not been initialized + or the list of requests is empty. int dev_pm_qos_add_ancestor_request(dev, handle, type, value) -Add a PM QoS request for the first direct ancestor of the given device whose -power.ignore_children flag is unset (for DEV_PM_QOS_RESUME_LATENCY requests) -or whose power.set_latency_tolerance callback pointer is not NULL (for -DEV_PM_QOS_LATENCY_TOLERANCE requests). + Add a PM QoS request for the first direct ancestor of the given device whose + power.ignore_children flag is unset (for DEV_PM_QOS_RESUME_LATENCY requests) + or whose power.set_latency_tolerance callback pointer is not NULL (for + DEV_PM_QOS_LATENCY_TOLERANCE requests). int dev_pm_qos_expose_latency_limit(device, value) -Add a request to the device's PM QoS list of resume latency constraints and -create a sysfs attribute pm_qos_resume_latency_us under the device's power -directory allowing user space to manipulate that request. + Add a request to the device's PM QoS list of resume latency constraints and + create a sysfs attribute pm_qos_resume_latency_us under the device's power + directory allowing user space to manipulate that request. void dev_pm_qos_hide_latency_limit(device) -Drop the request added by dev_pm_qos_expose_latency_limit() from the device's -PM QoS list of resume latency constraints and remove sysfs attribute -pm_qos_resume_latency_us from the device's power directory. + Drop the request added by dev_pm_qos_expose_latency_limit() from the device's + PM QoS list of resume latency constraints and remove sysfs attribute + pm_qos_resume_latency_us from the device's power directory. int dev_pm_qos_expose_flags(device, value) -Add a request to the device's PM QoS list of flags and create sysfs attribute -pm_qos_no_power_off under the device's power directory allowing user space to -change the value of the PM_QOS_FLAG_NO_POWER_OFF flag. + Add a request to the device's PM QoS list of flags and create sysfs attribute + pm_qos_no_power_off under the device's power directory allowing user space to + change the value of the PM_QOS_FLAG_NO_POWER_OFF flag. void dev_pm_qos_hide_flags(device) -Drop the request added by dev_pm_qos_expose_flags() from the device's PM QoS list -of flags and remove sysfs attribute pm_qos_no_power_off from the device's power -directory. + Drop the request added by dev_pm_qos_expose_flags() from the device's PM QoS list + of flags and remove sysfs attribute pm_qos_no_power_off from the device's power + directory. Notification mechanisms: + The per-device PM QoS framework has a per-device notification tree. int dev_pm_qos_add_notifier(device, notifier): -Adds a notification callback function for the device. -The callback is called when the aggregated value of the device constraints list -is changed (for resume latency device PM QoS only). + Adds a notification callback function for the device. + The callback is called when the aggregated value of the device constraints list + is changed (for resume latency device PM QoS only). int dev_pm_qos_remove_notifier(device, notifier): -Removes the notification callback function for the device. + Removes the notification callback function for the device. Active state latency tolerance +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ This device PM QoS type is used to support systems in which hardware may switch to energy-saving operation modes on the fly. In those systems, if the operation diff --git a/Documentation/power/power_supply_class.rst b/Documentation/power/power_supply_class.rst new file mode 100644 index 000000000000..3f2c3fe38a61 --- /dev/null +++ b/Documentation/power/power_supply_class.rst @@ -0,0 +1,282 @@ +======================== +Linux power supply class +======================== + +Synopsis +~~~~~~~~ +Power supply class used to represent battery, UPS, AC or DC power supply +properties to user-space. + +It defines core set of attributes, which should be applicable to (almost) +every power supply out there. Attributes are available via sysfs and uevent +interfaces. + +Each attribute has well defined meaning, up to unit of measure used. While +the attributes provided are believed to be universally applicable to any +power supply, specific monitoring hardware may not be able to provide them +all, so any of them may be skipped. + +Power supply class is extensible, and allows to define drivers own attributes. +The core attribute set is subject to the standard Linux evolution (i.e. +if it will be found that some attribute is applicable to many power supply +types or their drivers, it can be added to the core set). + +It also integrates with LED framework, for the purpose of providing +typically expected feedback of battery charging/fully charged status and +AC/USB power supply online status. (Note that specific details of the +indication (including whether to use it at all) are fully controllable by +user and/or specific machine defaults, per design principles of LED +framework). + + +Attributes/properties +~~~~~~~~~~~~~~~~~~~~~ +Power supply class has predefined set of attributes, this eliminates code +duplication across drivers. Power supply class insist on reusing its +predefined attributes *and* their units. + +So, userspace gets predictable set of attributes and their units for any +kind of power supply, and can process/present them to a user in consistent +manner. Results for different power supplies and machines are also directly +comparable. + +See drivers/power/supply/ds2760_battery.c and drivers/power/supply/pda_power.c +for the example how to declare and handle attributes. + + +Units +~~~~~ +Quoting include/linux/power_supply.h: + + All voltages, currents, charges, energies, time and temperatures in µV, + µA, µAh, µWh, seconds and tenths of degree Celsius unless otherwise + stated. It's driver's job to convert its raw values to units in which + this class operates. + + +Attributes/properties detailed +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + ++--------------------------------------------------------------------------+ +| **Charge/Energy/Capacity - how to not confuse** | ++--------------------------------------------------------------------------+ +| **Because both "charge" (µAh) and "energy" (µWh) represents "capacity" | +| of battery, this class distinguish these terms. Don't mix them!** | +| | +| - `CHARGE_*` | +| attributes represents capacity in µAh only. | +| - `ENERGY_*` | +| attributes represents capacity in µWh only. | +| - `CAPACITY` | +| attribute represents capacity in *percents*, from 0 to 100. | ++--------------------------------------------------------------------------+ + +Postfixes: + +_AVG + *hardware* averaged value, use it if your hardware is really able to + report averaged values. +_NOW + momentary/instantaneous values. + +STATUS + this attribute represents operating status (charging, full, + discharging (i.e. powering a load), etc.). This corresponds to + `BATTERY_STATUS_*` values, as defined in battery.h. + +CHARGE_TYPE + batteries can typically charge at different rates. + This defines trickle and fast charges. For batteries that + are already charged or discharging, 'n/a' can be displayed (or + 'unknown', if the status is not known). + +AUTHENTIC + indicates the power supply (battery or charger) connected + to the platform is authentic(1) or non authentic(0). + +HEALTH + represents health of the battery, values corresponds to + POWER_SUPPLY_HEALTH_*, defined in battery.h. + +VOLTAGE_OCV + open circuit voltage of the battery. + +VOLTAGE_MAX_DESIGN, VOLTAGE_MIN_DESIGN + design values for maximal and minimal power supply voltages. + Maximal/minimal means values of voltages when battery considered + "full"/"empty" at normal conditions. Yes, there is no direct relation + between voltage and battery capacity, but some dumb + batteries use voltage for very approximated calculation of capacity. + Battery driver also can use this attribute just to inform userspace + about maximal and minimal voltage thresholds of a given battery. + +VOLTAGE_MAX, VOLTAGE_MIN + same as _DESIGN voltage values except that these ones should be used + if hardware could only guess (measure and retain) the thresholds of a + given power supply. + +VOLTAGE_BOOT + Reports the voltage measured during boot + +CURRENT_BOOT + Reports the current measured during boot + +CHARGE_FULL_DESIGN, CHARGE_EMPTY_DESIGN + design charge values, when battery considered full/empty. + +ENERGY_FULL_DESIGN, ENERGY_EMPTY_DESIGN + same as above but for energy. + +CHARGE_FULL, CHARGE_EMPTY + These attributes means "last remembered value of charge when battery + became full/empty". It also could mean "value of charge when battery + considered full/empty at given conditions (temperature, age)". + I.e. these attributes represents real thresholds, not design values. + +ENERGY_FULL, ENERGY_EMPTY + same as above but for energy. + +CHARGE_COUNTER + the current charge counter (in µAh). This could easily + be negative; there is no empty or full value. It is only useful for + relative, time-based measurements. + +PRECHARGE_CURRENT + the maximum charge current during precharge phase of charge cycle + (typically 20% of battery capacity). + +CHARGE_TERM_CURRENT + Charge termination current. The charge cycle terminates when battery + voltage is above recharge threshold, and charge current is below + this setting (typically 10% of battery capacity). + +CONSTANT_CHARGE_CURRENT + constant charge current programmed by charger. + + +CONSTANT_CHARGE_CURRENT_MAX + maximum charge current supported by the power supply object. + +CONSTANT_CHARGE_VOLTAGE + constant charge voltage programmed by charger. +CONSTANT_CHARGE_VOLTAGE_MAX + maximum charge voltage supported by the power supply object. + +INPUT_CURRENT_LIMIT + input current limit programmed by charger. Indicates + the current drawn from a charging source. + +CHARGE_CONTROL_LIMIT + current charge control limit setting +CHARGE_CONTROL_LIMIT_MAX + maximum charge control limit setting + +CALIBRATE + battery or coulomb counter calibration status + +CAPACITY + capacity in percents. +CAPACITY_ALERT_MIN + minimum capacity alert value in percents. +CAPACITY_ALERT_MAX + maximum capacity alert value in percents. +CAPACITY_LEVEL + capacity level. This corresponds to POWER_SUPPLY_CAPACITY_LEVEL_*. + +TEMP + temperature of the power supply. +TEMP_ALERT_MIN + minimum battery temperature alert. +TEMP_ALERT_MAX + maximum battery temperature alert. +TEMP_AMBIENT + ambient temperature. +TEMP_AMBIENT_ALERT_MIN + minimum ambient temperature alert. +TEMP_AMBIENT_ALERT_MAX + maximum ambient temperature alert. +TEMP_MIN + minimum operatable temperature +TEMP_MAX + maximum operatable temperature + +TIME_TO_EMPTY + seconds left for battery to be considered empty + (i.e. while battery powers a load) +TIME_TO_FULL + seconds left for battery to be considered full + (i.e. while battery is charging) + + +Battery <-> external power supply interaction +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ +Often power supplies are acting as supplies and supplicants at the same +time. Batteries are good example. So, batteries usually care if they're +externally powered or not. + +For that case, power supply class implements notification mechanism for +batteries. + +External power supply (AC) lists supplicants (batteries) names in +"supplied_to" struct member, and each power_supply_changed() call +issued by external power supply will notify supplicants via +external_power_changed callback. + + +Devicetree battery characteristics +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ +Drivers should call power_supply_get_battery_info() to obtain battery +characteristics from a devicetree battery node, defined in +Documentation/devicetree/bindings/power/supply/battery.txt. This is +implemented in drivers/power/supply/bq27xxx_battery.c. + +Properties in struct power_supply_battery_info and their counterparts in the +battery node have names corresponding to elements in enum power_supply_property, +for naming consistency between sysfs attributes and battery node properties. + + +QA +~~ + +Q: + Where is POWER_SUPPLY_PROP_XYZ attribute? +A: + If you cannot find attribute suitable for your driver needs, feel free + to add it and send patch along with your driver. + + The attributes available currently are the ones currently provided by the + drivers written. + + Good candidates to add in future: model/part#, cycle_time, manufacturer, + etc. + + +Q: + I have some very specific attribute (e.g. battery color), should I add + this attribute to standard ones? +A: + Most likely, no. Such attribute can be placed in the driver itself, if + it is useful. Of course, if the attribute in question applicable to + large set of batteries, provided by many drivers, and/or comes from + some general battery specification/standard, it may be a candidate to + be added to the core attribute set. + + +Q: + Suppose, my battery monitoring chip/firmware does not provides capacity + in percents, but provides charge_{now,full,empty}. Should I calculate + percentage capacity manually, inside the driver, and register CAPACITY + attribute? The same question about time_to_empty/time_to_full. +A: + Most likely, no. This class is designed to export properties which are + directly measurable by the specific hardware available. + + Inferring not available properties using some heuristics or mathematical + model is not subject of work for a battery driver. Such functionality + should be factored out, and in fact, apm_power, the driver to serve + legacy APM API on top of power supply class, uses a simple heuristic of + approximating remaining battery capacity based on its charge, current, + voltage and so on. But full-fledged battery model is likely not subject + for kernel at all, as it would require floating point calculation to deal + with things like differential equations and Kalman filters. This is + better be handled by batteryd/libbattery, yet to be written. diff --git a/Documentation/power/power_supply_class.txt b/Documentation/power/power_supply_class.txt deleted file mode 100644 index 300d37896e51..000000000000 --- a/Documentation/power/power_supply_class.txt +++ /dev/null @@ -1,231 +0,0 @@ -Linux power supply class -======================== - -Synopsis -~~~~~~~~ -Power supply class used to represent battery, UPS, AC or DC power supply -properties to user-space. - -It defines core set of attributes, which should be applicable to (almost) -every power supply out there. Attributes are available via sysfs and uevent -interfaces. - -Each attribute has well defined meaning, up to unit of measure used. While -the attributes provided are believed to be universally applicable to any -power supply, specific monitoring hardware may not be able to provide them -all, so any of them may be skipped. - -Power supply class is extensible, and allows to define drivers own attributes. -The core attribute set is subject to the standard Linux evolution (i.e. -if it will be found that some attribute is applicable to many power supply -types or their drivers, it can be added to the core set). - -It also integrates with LED framework, for the purpose of providing -typically expected feedback of battery charging/fully charged status and -AC/USB power supply online status. (Note that specific details of the -indication (including whether to use it at all) are fully controllable by -user and/or specific machine defaults, per design principles of LED -framework). - - -Attributes/properties -~~~~~~~~~~~~~~~~~~~~~ -Power supply class has predefined set of attributes, this eliminates code -duplication across drivers. Power supply class insist on reusing its -predefined attributes *and* their units. - -So, userspace gets predictable set of attributes and their units for any -kind of power supply, and can process/present them to a user in consistent -manner. Results for different power supplies and machines are also directly -comparable. - -See drivers/power/supply/ds2760_battery.c and drivers/power/supply/pda_power.c -for the example how to declare and handle attributes. - - -Units -~~~~~ -Quoting include/linux/power_supply.h: - - All voltages, currents, charges, energies, time and temperatures in µV, - µA, µAh, µWh, seconds and tenths of degree Celsius unless otherwise - stated. It's driver's job to convert its raw values to units in which - this class operates. - - -Attributes/properties detailed -~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ - -~ ~ ~ ~ ~ ~ ~ Charge/Energy/Capacity - how to not confuse ~ ~ ~ ~ ~ ~ ~ -~ ~ -~ Because both "charge" (µAh) and "energy" (µWh) represents "capacity" ~ -~ of battery, this class distinguish these terms. Don't mix them! ~ -~ ~ -~ CHARGE_* attributes represents capacity in µAh only. ~ -~ ENERGY_* attributes represents capacity in µWh only. ~ -~ CAPACITY attribute represents capacity in *percents*, from 0 to 100. ~ -~ ~ -~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ - -Postfixes: -_AVG - *hardware* averaged value, use it if your hardware is really able to -report averaged values. -_NOW - momentary/instantaneous values. - -STATUS - this attribute represents operating status (charging, full, -discharging (i.e. powering a load), etc.). This corresponds to -BATTERY_STATUS_* values, as defined in battery.h. - -CHARGE_TYPE - batteries can typically charge at different rates. -This defines trickle and fast charges. For batteries that -are already charged or discharging, 'n/a' can be displayed (or -'unknown', if the status is not known). - -AUTHENTIC - indicates the power supply (battery or charger) connected -to the platform is authentic(1) or non authentic(0). - -HEALTH - represents health of the battery, values corresponds to -POWER_SUPPLY_HEALTH_*, defined in battery.h. - -VOLTAGE_OCV - open circuit voltage of the battery. - -VOLTAGE_MAX_DESIGN, VOLTAGE_MIN_DESIGN - design values for maximal and -minimal power supply voltages. Maximal/minimal means values of voltages -when battery considered "full"/"empty" at normal conditions. Yes, there is -no direct relation between voltage and battery capacity, but some dumb -batteries use voltage for very approximated calculation of capacity. -Battery driver also can use this attribute just to inform userspace -about maximal and minimal voltage thresholds of a given battery. - -VOLTAGE_MAX, VOLTAGE_MIN - same as _DESIGN voltage values except that -these ones should be used if hardware could only guess (measure and -retain) the thresholds of a given power supply. - -VOLTAGE_BOOT - Reports the voltage measured during boot - -CURRENT_BOOT - Reports the current measured during boot - -CHARGE_FULL_DESIGN, CHARGE_EMPTY_DESIGN - design charge values, when -battery considered full/empty. - -ENERGY_FULL_DESIGN, ENERGY_EMPTY_DESIGN - same as above but for energy. - -CHARGE_FULL, CHARGE_EMPTY - These attributes means "last remembered value -of charge when battery became full/empty". It also could mean "value of -charge when battery considered full/empty at given conditions (temperature, -age)". I.e. these attributes represents real thresholds, not design values. - -ENERGY_FULL, ENERGY_EMPTY - same as above but for energy. - -CHARGE_COUNTER - the current charge counter (in µAh). This could easily -be negative; there is no empty or full value. It is only useful for -relative, time-based measurements. - -PRECHARGE_CURRENT - the maximum charge current during precharge phase -of charge cycle (typically 20% of battery capacity). -CHARGE_TERM_CURRENT - Charge termination current. The charge cycle -terminates when battery voltage is above recharge threshold, and charge -current is below this setting (typically 10% of battery capacity). - -CONSTANT_CHARGE_CURRENT - constant charge current programmed by charger. -CONSTANT_CHARGE_CURRENT_MAX - maximum charge current supported by the -power supply object. - -CONSTANT_CHARGE_VOLTAGE - constant charge voltage programmed by charger. -CONSTANT_CHARGE_VOLTAGE_MAX - maximum charge voltage supported by the -power supply object. - -INPUT_CURRENT_LIMIT - input current limit programmed by charger. Indicates -the current drawn from a charging source. - -CHARGE_CONTROL_LIMIT - current charge control limit setting -CHARGE_CONTROL_LIMIT_MAX - maximum charge control limit setting - -CALIBRATE - battery or coulomb counter calibration status - -CAPACITY - capacity in percents. -CAPACITY_ALERT_MIN - minimum capacity alert value in percents. -CAPACITY_ALERT_MAX - maximum capacity alert value in percents. -CAPACITY_LEVEL - capacity level. This corresponds to -POWER_SUPPLY_CAPACITY_LEVEL_*. - -TEMP - temperature of the power supply. -TEMP_ALERT_MIN - minimum battery temperature alert. -TEMP_ALERT_MAX - maximum battery temperature alert. -TEMP_AMBIENT - ambient temperature. -TEMP_AMBIENT_ALERT_MIN - minimum ambient temperature alert. -TEMP_AMBIENT_ALERT_MAX - maximum ambient temperature alert. -TEMP_MIN - minimum operatable temperature -TEMP_MAX - maximum operatable temperature - -TIME_TO_EMPTY - seconds left for battery to be considered empty (i.e. -while battery powers a load) -TIME_TO_FULL - seconds left for battery to be considered full (i.e. -while battery is charging) - - -Battery <-> external power supply interaction -~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ -Often power supplies are acting as supplies and supplicants at the same -time. Batteries are good example. So, batteries usually care if they're -externally powered or not. - -For that case, power supply class implements notification mechanism for -batteries. - -External power supply (AC) lists supplicants (batteries) names in -"supplied_to" struct member, and each power_supply_changed() call -issued by external power supply will notify supplicants via -external_power_changed callback. - - -Devicetree battery characteristics -~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ -Drivers should call power_supply_get_battery_info() to obtain battery -characteristics from a devicetree battery node, defined in -Documentation/devicetree/bindings/power/supply/battery.txt. This is -implemented in drivers/power/supply/bq27xxx_battery.c. - -Properties in struct power_supply_battery_info and their counterparts in the -battery node have names corresponding to elements in enum power_supply_property, -for naming consistency between sysfs attributes and battery node properties. - - -QA -~~ -Q: Where is POWER_SUPPLY_PROP_XYZ attribute? -A: If you cannot find attribute suitable for your driver needs, feel free - to add it and send patch along with your driver. - - The attributes available currently are the ones currently provided by the - drivers written. - - Good candidates to add in future: model/part#, cycle_time, manufacturer, - etc. - - -Q: I have some very specific attribute (e.g. battery color), should I add - this attribute to standard ones? -A: Most likely, no. Such attribute can be placed in the driver itself, if - it is useful. Of course, if the attribute in question applicable to - large set of batteries, provided by many drivers, and/or comes from - some general battery specification/standard, it may be a candidate to - be added to the core attribute set. - - -Q: Suppose, my battery monitoring chip/firmware does not provides capacity - in percents, but provides charge_{now,full,empty}. Should I calculate - percentage capacity manually, inside the driver, and register CAPACITY - attribute? The same question about time_to_empty/time_to_full. -A: Most likely, no. This class is designed to export properties which are - directly measurable by the specific hardware available. - - Inferring not available properties using some heuristics or mathematical - model is not subject of work for a battery driver. Such functionality - should be factored out, and in fact, apm_power, the driver to serve - legacy APM API on top of power supply class, uses a simple heuristic of - approximating remaining battery capacity based on its charge, current, - voltage and so on. But full-fledged battery model is likely not subject - for kernel at all, as it would require floating point calculation to deal - with things like differential equations and Kalman filters. This is - better be handled by batteryd/libbattery, yet to be written. diff --git a/Documentation/power/powercap/powercap.rst b/Documentation/power/powercap/powercap.rst new file mode 100644 index 000000000000..7ae3b44c7624 --- /dev/null +++ b/Documentation/power/powercap/powercap.rst @@ -0,0 +1,257 @@ +======================= +Power Capping Framework +======================= + +The power capping framework provides a consistent interface between the kernel +and the user space that allows power capping drivers to expose the settings to +user space in a uniform way. + +Terminology +=========== + +The framework exposes power capping devices to user space via sysfs in the +form of a tree of objects. The objects at the root level of the tree represent +'control types', which correspond to different methods of power capping. For +example, the intel-rapl control type represents the Intel "Running Average +Power Limit" (RAPL) technology, whereas the 'idle-injection' control type +corresponds to the use of idle injection for controlling power. + +Power zones represent different parts of the system, which can be controlled and +monitored using the power capping method determined by the control type the +given zone belongs to. They each contain attributes for monitoring power, as +well as controls represented in the form of power constraints. If the parts of +the system represented by different power zones are hierarchical (that is, one +bigger part consists of multiple smaller parts that each have their own power +controls), those power zones may also be organized in a hierarchy with one +parent power zone containing multiple subzones and so on to reflect the power +control topology of the system. In that case, it is possible to apply power +capping to a set of devices together using the parent power zone and if more +fine grained control is required, it can be applied through the subzones. + + +Example sysfs interface tree:: + + /sys/devices/virtual/powercap + └──intel-rapl + ├──intel-rapl:0 + │ ├──constraint_0_name + │ ├──constraint_0_power_limit_uw + │ ├──constraint_0_time_window_us + │ ├──constraint_1_name + │ ├──constraint_1_power_limit_uw + │ ├──constraint_1_time_window_us + │ ├──device -> ../../intel-rapl + │ ├──energy_uj + │ ├──intel-rapl:0:0 + │ │ ├──constraint_0_name + │ │ ├──constraint_0_power_limit_uw + │ │ ├──constraint_0_time_window_us + │ │ ├──constraint_1_name + │ │ ├──constraint_1_power_limit_uw + │ │ ├──constraint_1_time_window_us + │ │ ├──device -> ../../intel-rapl:0 + │ │ ├──energy_uj + │ │ ├──max_energy_range_uj + │ │ ├──name + │ │ ├──enabled + │ │ ├──power + │ │ │ ├──async + │ │ │ [] + │ │ ├──subsystem -> ../../../../../../class/power_cap + │ │ └──uevent + │ ├──intel-rapl:0:1 + │ │ ├──constraint_0_name + │ │ ├──constraint_0_power_limit_uw + │ │ ├──constraint_0_time_window_us + │ │ ├──constraint_1_name + │ │ ├──constraint_1_power_limit_uw + │ │ ├──constraint_1_time_window_us + │ │ ├──device -> ../../intel-rapl:0 + │ │ ├──energy_uj + │ │ ├──max_energy_range_uj + │ │ ├──name + │ │ ├──enabled + │ │ ├──power + │ │ │ ├──async + │ │ │ [] + │ │ ├──subsystem -> ../../../../../../class/power_cap + │ │ └──uevent + │ ├──max_energy_range_uj + │ ├──max_power_range_uw + │ ├──name + │ ├──enabled + │ ├──power + │ │ ├──async + │ │ [] + │ ├──subsystem -> ../../../../../class/power_cap + │ ├──enabled + │ ├──uevent + ├──intel-rapl:1 + │ ├──constraint_0_name + │ ├──constraint_0_power_limit_uw + │ ├──constraint_0_time_window_us + │ ├──constraint_1_name + │ ├──constraint_1_power_limit_uw + │ ├──constraint_1_time_window_us + │ ├──device -> ../../intel-rapl + │ ├──energy_uj + │ ├──intel-rapl:1:0 + │ │ ├──constraint_0_name + │ │ ├──constraint_0_power_limit_uw + │ │ ├──constraint_0_time_window_us + │ │ ├──constraint_1_name + │ │ ├──constraint_1_power_limit_uw + │ │ ├──constraint_1_time_window_us + │ │ ├──device -> ../../intel-rapl:1 + │ │ ├──energy_uj + │ │ ├──max_energy_range_uj + │ │ ├──name + │ │ ├──enabled + │ │ ├──power + │ │ │ ├──async + │ │ │ [] + │ │ ├──subsystem -> ../../../../../../class/power_cap + │ │ └──uevent + │ ├──intel-rapl:1:1 + │ │ ├──constraint_0_name + │ │ ├──constraint_0_power_limit_uw + │ │ ├──constraint_0_time_window_us + │ │ ├──constraint_1_name + │ │ ├──constraint_1_power_limit_uw + │ │ ├──constraint_1_time_window_us + │ │ ├──device -> ../../intel-rapl:1 + │ │ ├──energy_uj + │ │ ├──max_energy_range_uj + │ │ ├──name + │ │ ├──enabled + │ │ ├──power + │ │ │ ├──async + │ │ │ [] + │ │ ├──subsystem -> ../../../../../../class/power_cap + │ │ └──uevent + │ ├──max_energy_range_uj + │ ├──max_power_range_uw + │ ├──name + │ ├──enabled + │ ├──power + │ │ ├──async + │ │ [] + │ ├──subsystem -> ../../../../../class/power_cap + │ ├──uevent + ├──power + │ ├──async + │ [] + ├──subsystem -> ../../../../class/power_cap + ├──enabled + └──uevent + +The above example illustrates a case in which the Intel RAPL technology, +available in Intel® IA-64 and IA-32 Processor Architectures, is used. There is one +control type called intel-rapl which contains two power zones, intel-rapl:0 and +intel-rapl:1, representing CPU packages. Each of these power zones contains +two subzones, intel-rapl:j:0 and intel-rapl:j:1 (j = 0, 1), representing the +"core" and the "uncore" parts of the given CPU package, respectively. All of +the zones and subzones contain energy monitoring attributes (energy_uj, +max_energy_range_uj) and constraint attributes (constraint_*) allowing controls +to be applied (the constraints in the 'package' power zones apply to the whole +CPU packages and the subzone constraints only apply to the respective parts of +the given package individually). Since Intel RAPL doesn't provide instantaneous +power value, there is no power_uw attribute. + +In addition to that, each power zone contains a name attribute, allowing the +part of the system represented by that zone to be identified. +For example:: + + cat /sys/class/power_cap/intel-rapl/intel-rapl:0/name + +package-0 +--------- + +The Intel RAPL technology allows two constraints, short term and long term, +with two different time windows to be applied to each power zone. Thus for +each zone there are 2 attributes representing the constraint names, 2 power +limits and 2 attributes representing the sizes of the time windows. Such that, +constraint_j_* attributes correspond to the jth constraint (j = 0,1). + +For example:: + + constraint_0_name + constraint_0_power_limit_uw + constraint_0_time_window_us + constraint_1_name + constraint_1_power_limit_uw + constraint_1_time_window_us + +Power Zone Attributes +===================== + +Monitoring attributes +--------------------- + +energy_uj (rw) + Current energy counter in micro joules. Write "0" to reset. + If the counter can not be reset, then this attribute is read only. + +max_energy_range_uj (ro) + Range of the above energy counter in micro-joules. + +power_uw (ro) + Current power in micro watts. + +max_power_range_uw (ro) + Range of the above power value in micro-watts. + +name (ro) + Name of this power zone. + +It is possible that some domains have both power ranges and energy counter ranges; +however, only one is mandatory. + +Constraints +----------- + +constraint_X_power_limit_uw (rw) + Power limit in micro watts, which should be applicable for the + time window specified by "constraint_X_time_window_us". + +constraint_X_time_window_us (rw) + Time window in micro seconds. + +constraint_X_name (ro) + An optional name of the constraint + +constraint_X_max_power_uw(ro) + Maximum allowed power in micro watts. + +constraint_X_min_power_uw(ro) + Minimum allowed power in micro watts. + +constraint_X_max_time_window_us(ro) + Maximum allowed time window in micro seconds. + +constraint_X_min_time_window_us(ro) + Minimum allowed time window in micro seconds. + +Except power_limit_uw and time_window_us other fields are optional. + +Common zone and control type attributes +--------------------------------------- + +enabled (rw): Enable/Disable controls at zone level or for all zones using +a control type. + +Power Cap Client Driver Interface +================================= + +The API summary: + +Call powercap_register_control_type() to register control type object. +Call powercap_register_zone() to register a power zone (under a given +control type), either as a top-level power zone or as a subzone of another +power zone registered earlier. +The number of constraints in a power zone and the corresponding callbacks have +to be defined prior to calling powercap_register_zone() to register that zone. + +To Free a power zone call powercap_unregister_zone(). +To free a control type object call powercap_unregister_control_type(). +Detailed API can be generated using kernel-doc on include/linux/powercap.h. diff --git a/Documentation/power/powercap/powercap.txt b/Documentation/power/powercap/powercap.txt deleted file mode 100644 index 1e6ef164e07a..000000000000 --- a/Documentation/power/powercap/powercap.txt +++ /dev/null @@ -1,236 +0,0 @@ -Power Capping Framework -================================== - -The power capping framework provides a consistent interface between the kernel -and the user space that allows power capping drivers to expose the settings to -user space in a uniform way. - -Terminology -========================= -The framework exposes power capping devices to user space via sysfs in the -form of a tree of objects. The objects at the root level of the tree represent -'control types', which correspond to different methods of power capping. For -example, the intel-rapl control type represents the Intel "Running Average -Power Limit" (RAPL) technology, whereas the 'idle-injection' control type -corresponds to the use of idle injection for controlling power. - -Power zones represent different parts of the system, which can be controlled and -monitored using the power capping method determined by the control type the -given zone belongs to. They each contain attributes for monitoring power, as -well as controls represented in the form of power constraints. If the parts of -the system represented by different power zones are hierarchical (that is, one -bigger part consists of multiple smaller parts that each have their own power -controls), those power zones may also be organized in a hierarchy with one -parent power zone containing multiple subzones and so on to reflect the power -control topology of the system. In that case, it is possible to apply power -capping to a set of devices together using the parent power zone and if more -fine grained control is required, it can be applied through the subzones. - - -Example sysfs interface tree: - -/sys/devices/virtual/powercap -??? intel-rapl - ??? intel-rapl:0 - ? ??? constraint_0_name - ? ??? constraint_0_power_limit_uw - ? ??? constraint_0_time_window_us - ? ??? constraint_1_name - ? ??? constraint_1_power_limit_uw - ? ??? constraint_1_time_window_us - ? ??? device -> ../../intel-rapl - ? ??? energy_uj - ? ??? intel-rapl:0:0 - ? ? ??? constraint_0_name - ? ? ??? constraint_0_power_limit_uw - ? ? ??? constraint_0_time_window_us - ? ? ??? constraint_1_name - ? ? ??? constraint_1_power_limit_uw - ? ? ??? constraint_1_time_window_us - ? ? ??? device -> ../../intel-rapl:0 - ? ? ??? energy_uj - ? ? ??? max_energy_range_uj - ? ? ??? name - ? ? ??? enabled - ? ? ??? power - ? ? ? ??? async - ? ? ? [] - ? ? ??? subsystem -> ../../../../../../class/power_cap - ? ? ??? uevent - ? ??? intel-rapl:0:1 - ? ? ??? constraint_0_name - ? ? ??? constraint_0_power_limit_uw - ? ? ??? constraint_0_time_window_us - ? ? ??? constraint_1_name - ? ? ??? constraint_1_power_limit_uw - ? ? ??? constraint_1_time_window_us - ? ? ??? device -> ../../intel-rapl:0 - ? ? ??? energy_uj - ? ? ??? max_energy_range_uj - ? ? ??? name - ? ? ??? enabled - ? ? ??? power - ? ? ? ??? async - ? ? ? [] - ? ? ??? subsystem -> ../../../../../../class/power_cap - ? ? ??? uevent - ? ??? max_energy_range_uj - ? ??? max_power_range_uw - ? ??? name - ? ??? enabled - ? ??? power - ? ? ??? async - ? ? [] - ? ??? subsystem -> ../../../../../class/power_cap - ? ??? enabled - ? ??? uevent - ??? intel-rapl:1 - ? ??? constraint_0_name - ? ??? constraint_0_power_limit_uw - ? ??? constraint_0_time_window_us - ? ??? constraint_1_name - ? ??? constraint_1_power_limit_uw - ? ??? constraint_1_time_window_us - ? ??? device -> ../../intel-rapl - ? ??? energy_uj - ? ??? intel-rapl:1:0 - ? ? ??? constraint_0_name - ? ? ??? constraint_0_power_limit_uw - ? ? ??? constraint_0_time_window_us - ? ? ??? constraint_1_name - ? ? ??? constraint_1_power_limit_uw - ? ? ??? constraint_1_time_window_us - ? ? ??? device -> ../../intel-rapl:1 - ? ? ??? energy_uj - ? ? ??? max_energy_range_uj - ? ? ??? name - ? ? ??? enabled - ? ? ??? power - ? ? ? ??? async - ? ? ? [] - ? ? ??? subsystem -> ../../../../../../class/power_cap - ? ? ??? uevent - ? ??? intel-rapl:1:1 - ? ? ??? constraint_0_name - ? ? ??? constraint_0_power_limit_uw - ? ? ??? constraint_0_time_window_us - ? ? ??? constraint_1_name - ? ? ??? constraint_1_power_limit_uw - ? ? ??? constraint_1_time_window_us - ? ? ??? device -> ../../intel-rapl:1 - ? ? ??? energy_uj - ? ? ??? max_energy_range_uj - ? ? ??? name - ? ? ??? enabled - ? ? ??? power - ? ? ? ??? async - ? ? ? [] - ? ? ??? subsystem -> ../../../../../../class/power_cap - ? ? ??? uevent - ? ??? max_energy_range_uj - ? ??? max_power_range_uw - ? ??? name - ? ??? enabled - ? ??? power - ? ? ??? async - ? ? [] - ? ??? subsystem -> ../../../../../class/power_cap - ? ??? uevent - ??? power - ? ??? async - ? [] - ??? subsystem -> ../../../../class/power_cap - ??? enabled - ??? uevent - -The above example illustrates a case in which the Intel RAPL technology, -available in Intel® IA-64 and IA-32 Processor Architectures, is used. There is one -control type called intel-rapl which contains two power zones, intel-rapl:0 and -intel-rapl:1, representing CPU packages. Each of these power zones contains -two subzones, intel-rapl:j:0 and intel-rapl:j:1 (j = 0, 1), representing the -"core" and the "uncore" parts of the given CPU package, respectively. All of -the zones and subzones contain energy monitoring attributes (energy_uj, -max_energy_range_uj) and constraint attributes (constraint_*) allowing controls -to be applied (the constraints in the 'package' power zones apply to the whole -CPU packages and the subzone constraints only apply to the respective parts of -the given package individually). Since Intel RAPL doesn't provide instantaneous -power value, there is no power_uw attribute. - -In addition to that, each power zone contains a name attribute, allowing the -part of the system represented by that zone to be identified. -For example: - -cat /sys/class/power_cap/intel-rapl/intel-rapl:0/name -package-0 - -The Intel RAPL technology allows two constraints, short term and long term, -with two different time windows to be applied to each power zone. Thus for -each zone there are 2 attributes representing the constraint names, 2 power -limits and 2 attributes representing the sizes of the time windows. Such that, -constraint_j_* attributes correspond to the jth constraint (j = 0,1). - -For example: - constraint_0_name - constraint_0_power_limit_uw - constraint_0_time_window_us - constraint_1_name - constraint_1_power_limit_uw - constraint_1_time_window_us - -Power Zone Attributes -================================= -Monitoring attributes ----------------------- - -energy_uj (rw): Current energy counter in micro joules. Write "0" to reset. -If the counter can not be reset, then this attribute is read only. - -max_energy_range_uj (ro): Range of the above energy counter in micro-joules. - -power_uw (ro): Current power in micro watts. - -max_power_range_uw (ro): Range of the above power value in micro-watts. - -name (ro): Name of this power zone. - -It is possible that some domains have both power ranges and energy counter ranges; -however, only one is mandatory. - -Constraints ----------------- -constraint_X_power_limit_uw (rw): Power limit in micro watts, which should be -applicable for the time window specified by "constraint_X_time_window_us". - -constraint_X_time_window_us (rw): Time window in micro seconds. - -constraint_X_name (ro): An optional name of the constraint - -constraint_X_max_power_uw(ro): Maximum allowed power in micro watts. - -constraint_X_min_power_uw(ro): Minimum allowed power in micro watts. - -constraint_X_max_time_window_us(ro): Maximum allowed time window in micro seconds. - -constraint_X_min_time_window_us(ro): Minimum allowed time window in micro seconds. - -Except power_limit_uw and time_window_us other fields are optional. - -Common zone and control type attributes ----------------------------------------- -enabled (rw): Enable/Disable controls at zone level or for all zones using -a control type. - -Power Cap Client Driver Interface -================================== -The API summary: - -Call powercap_register_control_type() to register control type object. -Call powercap_register_zone() to register a power zone (under a given -control type), either as a top-level power zone or as a subzone of another -power zone registered earlier. -The number of constraints in a power zone and the corresponding callbacks have -to be defined prior to calling powercap_register_zone() to register that zone. - -To Free a power zone call powercap_unregister_zone(). -To free a control type object call powercap_unregister_control_type(). -Detailed API can be generated using kernel-doc on include/linux/powercap.h. diff --git a/Documentation/power/regulator/consumer.txt b/Documentation/power/regulator/consumer.rst index e51564c1a140..0cd8cc1275a7 100644 --- a/Documentation/power/regulator/consumer.txt +++ b/Documentation/power/regulator/consumer.rst @@ -1,3 +1,4 @@ +=================================== Regulator Consumer Driver Interface =================================== @@ -8,73 +9,77 @@ Please see overview.txt for a description of the terms used in this text. 1. Consumer Regulator Access (static & dynamic drivers) ======================================================= -A consumer driver can get access to its supply regulator by calling :- +A consumer driver can get access to its supply regulator by calling :: -regulator = regulator_get(dev, "Vcc"); + regulator = regulator_get(dev, "Vcc"); The consumer passes in its struct device pointer and power supply ID. The core then finds the correct regulator by consulting a machine specific lookup table. If the lookup is successful then this call will return a pointer to the struct regulator that supplies this consumer. -To release the regulator the consumer driver should call :- +To release the regulator the consumer driver should call :: -regulator_put(regulator); + regulator_put(regulator); Consumers can be supplied by more than one regulator e.g. codec consumer with -analog and digital supplies :- +analog and digital supplies :: -digital = regulator_get(dev, "Vcc"); /* digital core */ -analog = regulator_get(dev, "Avdd"); /* analog */ + digital = regulator_get(dev, "Vcc"); /* digital core */ + analog = regulator_get(dev, "Avdd"); /* analog */ The regulator access functions regulator_get() and regulator_put() will usually be called in your device drivers probe() and remove() respectively. 2. Regulator Output Enable & Disable (static & dynamic drivers) -==================================================================== +=============================================================== + -A consumer can enable its power supply by calling:- +A consumer can enable its power supply by calling:: -int regulator_enable(regulator); + int regulator_enable(regulator); -NOTE: The supply may already be enabled before regulator_enabled() is called. -This may happen if the consumer shares the regulator or the regulator has been -previously enabled by bootloader or kernel board initialization code. +NOTE: + The supply may already be enabled before regulator_enabled() is called. + This may happen if the consumer shares the regulator or the regulator has been + previously enabled by bootloader or kernel board initialization code. -A consumer can determine if a regulator is enabled by calling :- +A consumer can determine if a regulator is enabled by calling:: -int regulator_is_enabled(regulator); + int regulator_is_enabled(regulator); This will return > zero when the regulator is enabled. -A consumer can disable its supply when no longer needed by calling :- +A consumer can disable its supply when no longer needed by calling:: -int regulator_disable(regulator); + int regulator_disable(regulator); -NOTE: This may not disable the supply if it's shared with other consumers. The -regulator will only be disabled when the enabled reference count is zero. +NOTE: + This may not disable the supply if it's shared with other consumers. The + regulator will only be disabled when the enabled reference count is zero. -Finally, a regulator can be forcefully disabled in the case of an emergency :- +Finally, a regulator can be forcefully disabled in the case of an emergency:: -int regulator_force_disable(regulator); + int regulator_force_disable(regulator); -NOTE: this will immediately and forcefully shutdown the regulator output. All -consumers will be powered off. +NOTE: + this will immediately and forcefully shutdown the regulator output. All + consumers will be powered off. 3. Regulator Voltage Control & Status (dynamic drivers) -====================================================== +======================================================= Some consumer drivers need to be able to dynamically change their supply voltage to match system operating points. e.g. CPUfreq drivers can scale voltage along with frequency to save power, SD drivers may need to select the correct card voltage, etc. -Consumers can control their supply voltage by calling :- +Consumers can control their supply voltage by calling:: -int regulator_set_voltage(regulator, min_uV, max_uV); + int regulator_set_voltage(regulator, min_uV, max_uV); Where min_uV and max_uV are the minimum and maximum acceptable voltages in microvolts. @@ -84,47 +89,50 @@ when enabled, then the voltage changes instantly, otherwise the voltage configuration changes and the voltage is physically set when the regulator is next enabled. -The regulators configured voltage output can be found by calling :- +The regulators configured voltage output can be found by calling:: -int regulator_get_voltage(regulator); + int regulator_get_voltage(regulator); -NOTE: get_voltage() will return the configured output voltage whether the -regulator is enabled or disabled and should NOT be used to determine regulator -output state. However this can be used in conjunction with is_enabled() to -determine the regulator physical output voltage. +NOTE: + get_voltage() will return the configured output voltage whether the + regulator is enabled or disabled and should NOT be used to determine regulator + output state. However this can be used in conjunction with is_enabled() to + determine the regulator physical output voltage. 4. Regulator Current Limit Control & Status (dynamic drivers) -=========================================================== +============================================================= Some consumer drivers need to be able to dynamically change their supply current limit to match system operating points. e.g. LCD backlight driver can change the current limit to vary the backlight brightness, USB drivers may want to set the limit to 500mA when supplying power. -Consumers can control their supply current limit by calling :- +Consumers can control their supply current limit by calling:: -int regulator_set_current_limit(regulator, min_uA, max_uA); + int regulator_set_current_limit(regulator, min_uA, max_uA); Where min_uA and max_uA are the minimum and maximum acceptable current limit in microamps. -NOTE: this can be called when the regulator is enabled or disabled. If called -when enabled, then the current limit changes instantly, otherwise the current -limit configuration changes and the current limit is physically set when the -regulator is next enabled. +NOTE: + this can be called when the regulator is enabled or disabled. If called + when enabled, then the current limit changes instantly, otherwise the current + limit configuration changes and the current limit is physically set when the + regulator is next enabled. -A regulators current limit can be found by calling :- +A regulators current limit can be found by calling:: -int regulator_get_current_limit(regulator); + int regulator_get_current_limit(regulator); -NOTE: get_current_limit() will return the current limit whether the regulator -is enabled or disabled and should not be used to determine regulator current -load. +NOTE: + get_current_limit() will return the current limit whether the regulator + is enabled or disabled and should not be used to determine regulator current + load. 5. Regulator Operating Mode Control & Status (dynamic drivers) -============================================================= +============================================================== Some consumers can further save system power by changing the operating mode of their supply regulator to be more efficient when the consumers operating state @@ -135,9 +143,9 @@ Regulator operating mode can be changed indirectly or directly. Indirect operating mode control. -------------------------------- Consumer drivers can request a change in their supply regulator operating mode -by calling :- +by calling:: -int regulator_set_load(struct regulator *regulator, int load_uA); + int regulator_set_load(struct regulator *regulator, int load_uA); This will cause the core to recalculate the total load on the regulator (based on all its consumers) and change operating mode (if necessary and permitted) @@ -153,12 +161,13 @@ consumers. Direct operating mode control. ------------------------------ + Bespoke or tightly coupled drivers may want to directly control regulator operating mode depending on their operating point. This can be achieved by -calling :- +calling:: -int regulator_set_mode(struct regulator *regulator, unsigned int mode); -unsigned int regulator_get_mode(struct regulator *regulator); + int regulator_set_mode(struct regulator *regulator, unsigned int mode); + unsigned int regulator_get_mode(struct regulator *regulator); Direct mode will only be used by consumers that *know* about the regulator and are not sharing the regulator with other consumers. @@ -166,24 +175,26 @@ are not sharing the regulator with other consumers. 6. Regulator Events =================== + Regulators can notify consumers of external events. Events could be received by consumers under regulator stress or failure conditions. -Consumers can register interest in regulator events by calling :- +Consumers can register interest in regulator events by calling:: -int regulator_register_notifier(struct regulator *regulator, - struct notifier_block *nb); + int regulator_register_notifier(struct regulator *regulator, + struct notifier_block *nb); -Consumers can unregister interest by calling :- +Consumers can unregister interest by calling:: -int regulator_unregister_notifier(struct regulator *regulator, - struct notifier_block *nb); + int regulator_unregister_notifier(struct regulator *regulator, + struct notifier_block *nb); Regulators use the kernel notifier framework to send event to their interested consumers. 7. Regulator Direct Register Access =================================== + Some kinds of power management hardware or firmware are designed such that they need to do low-level hardware access to regulators, with no involvement from the kernel. Examples of such devices are: @@ -199,20 +210,20 @@ to it. The regulator framework provides the following helpers for querying these details. Bus-specific details, like I2C addresses or transfer rates are handled by the -regmap framework. To get the regulator's regmap (if supported), use :- +regmap framework. To get the regulator's regmap (if supported), use:: -struct regmap *regulator_get_regmap(struct regulator *regulator); + struct regmap *regulator_get_regmap(struct regulator *regulator); To obtain the hardware register offset and bitmask for the regulator's voltage -selector register, use :- +selector register, use:: -int regulator_get_hardware_vsel_register(struct regulator *regulator, - unsigned *vsel_reg, - unsigned *vsel_mask); + int regulator_get_hardware_vsel_register(struct regulator *regulator, + unsigned *vsel_reg, + unsigned *vsel_mask); To convert a regulator framework voltage selector code (used by regulator_list_voltage) to a hardware-specific voltage selector that can be -directly written to the voltage selector register, use :- +directly written to the voltage selector register, use:: -int regulator_list_hardware_vsel(struct regulator *regulator, - unsigned selector); + int regulator_list_hardware_vsel(struct regulator *regulator, + unsigned selector); diff --git a/Documentation/power/regulator/design.txt b/Documentation/power/regulator/design.rst index fdd919b96830..3b09c6841dc4 100644 --- a/Documentation/power/regulator/design.txt +++ b/Documentation/power/regulator/design.rst @@ -1,3 +1,4 @@ +========================== Regulator API design notes ========================== @@ -14,7 +15,9 @@ Safety have different power requirements, and not all components with power requirements are visible to software. - => The API should make no changes to the hardware state unless it has +.. note:: + + The API should make no changes to the hardware state unless it has specific knowledge that these changes are safe to perform on this particular system. @@ -28,6 +31,8 @@ Consumer use cases - Many of the power supplies in the system will be shared between many different consumers. - => The consumer API should be structured so that these use cases are +.. note:: + + The consumer API should be structured so that these use cases are very easy to handle and so that consumers will work with shared supplies without any additional effort. diff --git a/Documentation/power/regulator/machine.txt b/Documentation/power/regulator/machine.rst index eff4dcaaa252..22fffefaa3ad 100644 --- a/Documentation/power/regulator/machine.txt +++ b/Documentation/power/regulator/machine.rst @@ -1,10 +1,11 @@ +================================== Regulator Machine Driver Interface -=================================== +================================== The regulator machine driver interface is intended for board/machine specific initialisation code to configure the regulator subsystem. -Consider the following machine :- +Consider the following machine:: Regulator-1 -+-> Regulator-2 --> [Consumer A @ 1.8 - 2.0V] | @@ -13,31 +14,31 @@ Consider the following machine :- The drivers for consumers A & B must be mapped to the correct regulator in order to control their power supplies. This mapping can be achieved in machine initialisation code by creating a struct regulator_consumer_supply for -each regulator. +each regulator:: -struct regulator_consumer_supply { + struct regulator_consumer_supply { const char *dev_name; /* consumer dev_name() */ const char *supply; /* consumer supply - e.g. "vcc" */ -}; + }; -e.g. for the machine above +e.g. for the machine above:: -static struct regulator_consumer_supply regulator1_consumers[] = { + static struct regulator_consumer_supply regulator1_consumers[] = { REGULATOR_SUPPLY("Vcc", "consumer B"), -}; + }; -static struct regulator_consumer_supply regulator2_consumers[] = { + static struct regulator_consumer_supply regulator2_consumers[] = { REGULATOR_SUPPLY("Vcc", "consumer A"), -}; + }; This maps Regulator-1 to the 'Vcc' supply for Consumer B and maps Regulator-2 to the 'Vcc' supply for Consumer A. Constraints can now be registered by defining a struct regulator_init_data for each regulator power domain. This structure also maps the consumers -to their supply regulators :- +to their supply regulators:: -static struct regulator_init_data regulator1_data = { + static struct regulator_init_data regulator1_data = { .constraints = { .name = "Regulator-1", .min_uV = 3300000, @@ -46,7 +47,7 @@ static struct regulator_init_data regulator1_data = { }, .num_consumer_supplies = ARRAY_SIZE(regulator1_consumers), .consumer_supplies = regulator1_consumers, -}; + }; The name field should be set to something that is usefully descriptive for the board for configuration of supplies for other regulators and @@ -57,9 +58,9 @@ name is provided then the subsystem will choose one. Regulator-1 supplies power to Regulator-2. This relationship must be registered with the core so that Regulator-1 is also enabled when Consumer A enables its supply (Regulator-2). The supply regulator is set by the supply_regulator -field below and co:- +field below and co:: -static struct regulator_init_data regulator2_data = { + static struct regulator_init_data regulator2_data = { .supply_regulator = "Regulator-1", .constraints = { .min_uV = 1800000, @@ -69,11 +70,11 @@ static struct regulator_init_data regulator2_data = { }, .num_consumer_supplies = ARRAY_SIZE(regulator2_consumers), .consumer_supplies = regulator2_consumers, -}; + }; -Finally the regulator devices must be registered in the usual manner. +Finally the regulator devices must be registered in the usual manner:: -static struct platform_device regulator_devices[] = { + static struct platform_device regulator_devices[] = { { .name = "regulator", .id = DCDC_1, @@ -88,9 +89,9 @@ static struct platform_device regulator_devices[] = { .platform_data = ®ulator2_data, }, }, -}; -/* register regulator 1 device */ -platform_device_register(®ulator_devices[0]); + }; + /* register regulator 1 device */ + platform_device_register(®ulator_devices[0]); -/* register regulator 2 device */ -platform_device_register(®ulator_devices[1]); + /* register regulator 2 device */ + platform_device_register(®ulator_devices[1]); diff --git a/Documentation/power/regulator/overview.txt b/Documentation/power/regulator/overview.rst index 721b4739ec32..ee494c70a7c4 100644 --- a/Documentation/power/regulator/overview.txt +++ b/Documentation/power/regulator/overview.rst @@ -1,3 +1,4 @@ +============================================= Linux voltage and current regulator framework ============================================= @@ -13,26 +14,30 @@ regulators (where voltage output is controllable) and current sinks (where current limit is controllable). (C) 2008 Wolfson Microelectronics PLC. + Author: Liam Girdwood <lrg@slimlogic.co.uk> Nomenclature ============ -Some terms used in this document:- +Some terms used in this document: - o Regulator - Electronic device that supplies power to other devices. + - Regulator + - Electronic device that supplies power to other devices. Most regulators can enable and disable their output while some can control their output voltage and or current. Input Voltage -> Regulator -> Output Voltage - o PMIC - Power Management IC. An IC that contains numerous regulators - and often contains other subsystems. + - PMIC + - Power Management IC. An IC that contains numerous + regulators and often contains other subsystems. - o Consumer - Electronic device that is supplied power by a regulator. + - Consumer + - Electronic device that is supplied power by a regulator. Consumers can be classified into two types:- Static: consumer does not change its supply voltage or @@ -44,46 +49,48 @@ Some terms used in this document:- current limit to meet operation demands. - o Power Domain - Electronic circuit that is supplied its input power by the + - Power Domain + - Electronic circuit that is supplied its input power by the output power of a regulator, switch or by another power domain. - The supply regulator may be behind a switch(s). i.e. + The supply regulator may be behind a switch(s). i.e.:: - Regulator -+-> Switch-1 -+-> Switch-2 --> [Consumer A] - | | - | +-> [Consumer B], [Consumer C] - | - +-> [Consumer D], [Consumer E] + Regulator -+-> Switch-1 -+-> Switch-2 --> [Consumer A] + | | + | +-> [Consumer B], [Consumer C] + | + +-> [Consumer D], [Consumer E] That is one regulator and three power domains: - Domain 1: Switch-1, Consumers D & E. - Domain 2: Switch-2, Consumers B & C. - Domain 3: Consumer A. + - Domain 1: Switch-1, Consumers D & E. + - Domain 2: Switch-2, Consumers B & C. + - Domain 3: Consumer A. and this represents a "supplies" relationship: Domain-1 --> Domain-2 --> Domain-3. A power domain may have regulators that are supplied power - by other regulators. i.e. + by other regulators. i.e.:: - Regulator-1 -+-> Regulator-2 -+-> [Consumer A] - | - +-> [Consumer B] + Regulator-1 -+-> Regulator-2 -+-> [Consumer A] + | + +-> [Consumer B] This gives us two regulators and two power domains: - Domain 1: Regulator-2, Consumer B. - Domain 2: Consumer A. + - Domain 1: Regulator-2, Consumer B. + - Domain 2: Consumer A. and a "supplies" relationship: Domain-1 --> Domain-2 - o Constraints - Constraints are used to define power levels for performance + - Constraints + - Constraints are used to define power levels for performance and hardware protection. Constraints exist at three levels: Regulator Level: This is defined by the regulator hardware @@ -141,7 +148,7 @@ relevant to non SoC devices and is split into the following four interfaces:- limit. This also compiles out if not in use so drivers can be reused in systems with no regulator based power control. - See Documentation/power/regulator/consumer.txt + See Documentation/power/regulator/consumer.rst 2. Regulator driver interface. @@ -149,7 +156,7 @@ relevant to non SoC devices and is split into the following four interfaces:- operations to the core. It also has a notifier call chain for propagating regulator events to clients. - See Documentation/power/regulator/regulator.txt + See Documentation/power/regulator/regulator.rst 3. Machine interface. @@ -160,7 +167,7 @@ relevant to non SoC devices and is split into the following four interfaces:- allows the creation of a regulator tree whereby some regulators are supplied by others (similar to a clock tree). - See Documentation/power/regulator/machine.txt + See Documentation/power/regulator/machine.rst 4. Userspace ABI. diff --git a/Documentation/power/regulator/regulator.rst b/Documentation/power/regulator/regulator.rst new file mode 100644 index 000000000000..794b3256fbb9 --- /dev/null +++ b/Documentation/power/regulator/regulator.rst @@ -0,0 +1,32 @@ +========================== +Regulator Driver Interface +========================== + +The regulator driver interface is relatively simple and designed to allow +regulator drivers to register their services with the core framework. + + +Registration +============ + +Drivers can register a regulator by calling:: + + struct regulator_dev *regulator_register(struct regulator_desc *regulator_desc, + const struct regulator_config *config); + +This will register the regulator's capabilities and operations to the regulator +core. + +Regulators can be unregistered by calling:: + + void regulator_unregister(struct regulator_dev *rdev); + + +Regulator Events +================ + +Regulators can send events (e.g. overtemperature, undervoltage, etc) to +consumer drivers by calling:: + + int regulator_notifier_call_chain(struct regulator_dev *rdev, + unsigned long event, void *data); diff --git a/Documentation/power/regulator/regulator.txt b/Documentation/power/regulator/regulator.txt deleted file mode 100644 index b17e5833ce21..000000000000 --- a/Documentation/power/regulator/regulator.txt +++ /dev/null @@ -1,30 +0,0 @@ -Regulator Driver Interface -========================== - -The regulator driver interface is relatively simple and designed to allow -regulator drivers to register their services with the core framework. - - -Registration -============ - -Drivers can register a regulator by calling :- - -struct regulator_dev *regulator_register(struct regulator_desc *regulator_desc, - const struct regulator_config *config); - -This will register the regulator's capabilities and operations to the regulator -core. - -Regulators can be unregistered by calling :- - -void regulator_unregister(struct regulator_dev *rdev); - - -Regulator Events -================ -Regulators can send events (e.g. overtemperature, undervoltage, etc) to -consumer drivers by calling :- - -int regulator_notifier_call_chain(struct regulator_dev *rdev, - unsigned long event, void *data); diff --git a/Documentation/power/runtime_pm.txt b/Documentation/power/runtime_pm.rst index 937e33c46211..2c2ec99b5088 100644 --- a/Documentation/power/runtime_pm.txt +++ b/Documentation/power/runtime_pm.rst @@ -1,10 +1,15 @@ +================================================== Runtime Power Management Framework for I/O Devices +================================================== (C) 2009-2011 Rafael J. Wysocki <rjw@sisk.pl>, Novell Inc. + (C) 2010 Alan Stern <stern@rowland.harvard.edu> + (C) 2014 Intel Corp., Rafael J. Wysocki <rafael.j.wysocki@intel.com> 1. Introduction +=============== Support for runtime power management (runtime PM) of I/O devices is provided at the power management core (PM core) level by means of: @@ -33,16 +38,17 @@ fields of 'struct dev_pm_info' and the core helper functions provided for runtime PM are described below. 2. Device Runtime PM Callbacks +============================== -There are three device runtime PM callbacks defined in 'struct dev_pm_ops': +There are three device runtime PM callbacks defined in 'struct dev_pm_ops':: -struct dev_pm_ops { + struct dev_pm_ops { ... int (*runtime_suspend)(struct device *dev); int (*runtime_resume)(struct device *dev); int (*runtime_idle)(struct device *dev); ... -}; + }; The ->runtime_suspend(), ->runtime_resume() and ->runtime_idle() callbacks are executed by the PM core for the device's subsystem that may be either of @@ -112,7 +118,7 @@ low-power state during the execution of the suspend callback, it is expected that remote wakeup will be enabled for the device. Generally, remote wakeup should be enabled for all input devices put into low-power states at run time. -The subsystem-level resume callback, if present, is _entirely_ _responsible_ for +The subsystem-level resume callback, if present, is **entirely responsible** for handling the resume of the device as appropriate, which may, but need not include executing the device driver's own ->runtime_resume() callback (from the PM core's point of view it is not necessary to implement a ->runtime_resume() @@ -197,95 +203,96 @@ rules: except for scheduled autosuspends. 3. Runtime PM Device Fields +=========================== The following device runtime PM fields are present in 'struct dev_pm_info', as defined in include/linux/pm.h: - struct timer_list suspend_timer; + `struct timer_list suspend_timer;` - timer used for scheduling (delayed) suspend and autosuspend requests - unsigned long timer_expires; + `unsigned long timer_expires;` - timer expiration time, in jiffies (if this is different from zero, the timer is running and will expire at that time, otherwise the timer is not running) - struct work_struct work; + `struct work_struct work;` - work structure used for queuing up requests (i.e. work items in pm_wq) - wait_queue_head_t wait_queue; + `wait_queue_head_t wait_queue;` - wait queue used if any of the helper functions needs to wait for another one to complete - spinlock_t lock; + `spinlock_t lock;` - lock used for synchronization - atomic_t usage_count; + `atomic_t usage_count;` - the usage counter of the device - atomic_t child_count; + `atomic_t child_count;` - the count of 'active' children of the device - unsigned int ignore_children; + `unsigned int ignore_children;` - if set, the value of child_count is ignored (but still updated) - unsigned int disable_depth; + `unsigned int disable_depth;` - used for disabling the helper functions (they work normally if this is equal to zero); the initial value of it is 1 (i.e. runtime PM is initially disabled for all devices) - int runtime_error; + `int runtime_error;` - if set, there was a fatal error (one of the callbacks returned error code as described in Section 2), so the helper functions will not work until this flag is cleared; this is the error code returned by the failing callback - unsigned int idle_notification; + `unsigned int idle_notification;` - if set, ->runtime_idle() is being executed - unsigned int request_pending; + `unsigned int request_pending;` - if set, there's a pending request (i.e. a work item queued up into pm_wq) - enum rpm_request request; + `enum rpm_request request;` - type of request that's pending (valid if request_pending is set) - unsigned int deferred_resume; + `unsigned int deferred_resume;` - set if ->runtime_resume() is about to be run while ->runtime_suspend() is being executed for that device and it is not practical to wait for the suspend to complete; means "start a resume as soon as you've suspended" - enum rpm_status runtime_status; + `enum rpm_status runtime_status;` - the runtime PM status of the device; this field's initial value is RPM_SUSPENDED, which means that each device is initially regarded by the PM core as 'suspended', regardless of its real hardware status - unsigned int runtime_auto; + `unsigned int runtime_auto;` - if set, indicates that the user space has allowed the device driver to power manage the device at run time via the /sys/devices/.../power/control - interface; it may only be modified with the help of the pm_runtime_allow() + `interface;` it may only be modified with the help of the pm_runtime_allow() and pm_runtime_forbid() helper functions - unsigned int no_callbacks; + `unsigned int no_callbacks;` - indicates that the device does not use the runtime PM callbacks (see Section 8); it may be modified only by the pm_runtime_no_callbacks() helper function - unsigned int irq_safe; + `unsigned int irq_safe;` - indicates that the ->runtime_suspend() and ->runtime_resume() callbacks will be invoked with the spinlock held and interrupts disabled - unsigned int use_autosuspend; + `unsigned int use_autosuspend;` - indicates that the device's driver supports delayed autosuspend (see Section 9); it may be modified only by the pm_runtime{_dont}_use_autosuspend() helper functions - unsigned int timer_autosuspends; + `unsigned int timer_autosuspends;` - indicates that the PM core should attempt to carry out an autosuspend when the timer expires rather than a normal suspend - int autosuspend_delay; + `int autosuspend_delay;` - the delay time (in milliseconds) to be used for autosuspend - unsigned long last_busy; + `unsigned long last_busy;` - the time (in jiffies) when the pm_runtime_mark_last_busy() helper function was last called for this device; used in calculating inactivity periods for autosuspend @@ -293,37 +300,38 @@ defined in include/linux/pm.h: All of the above fields are members of the 'power' member of 'struct device'. 4. Runtime PM Device Helper Functions +===================================== The following runtime PM helper functions are defined in drivers/base/power/runtime.c and include/linux/pm_runtime.h: - void pm_runtime_init(struct device *dev); + `void pm_runtime_init(struct device *dev);` - initialize the device runtime PM fields in 'struct dev_pm_info' - void pm_runtime_remove(struct device *dev); + `void pm_runtime_remove(struct device *dev);` - make sure that the runtime PM of the device will be disabled after removing the device from device hierarchy - int pm_runtime_idle(struct device *dev); + `int pm_runtime_idle(struct device *dev);` - execute the subsystem-level idle callback for the device; returns an error code on failure, where -EINPROGRESS means that ->runtime_idle() is already being executed; if there is no callback or the callback returns 0 then run pm_runtime_autosuspend(dev) and return its result - int pm_runtime_suspend(struct device *dev); + `int pm_runtime_suspend(struct device *dev);` - execute the subsystem-level suspend callback for the device; returns 0 on success, 1 if the device's runtime PM status was already 'suspended', or error code on failure, where -EAGAIN or -EBUSY means it is safe to attempt to suspend the device again in future and -EACCES means that 'power.disable_depth' is different from 0 - int pm_runtime_autosuspend(struct device *dev); + `int pm_runtime_autosuspend(struct device *dev);` - same as pm_runtime_suspend() except that the autosuspend delay is taken - into account; if pm_runtime_autosuspend_expiration() says the delay has + `into account;` if pm_runtime_autosuspend_expiration() says the delay has not yet expired then an autosuspend is scheduled for the appropriate time and 0 is returned - int pm_runtime_resume(struct device *dev); + `int pm_runtime_resume(struct device *dev);` - execute the subsystem-level resume callback for the device; returns 0 on success, 1 if the device's runtime PM status was already 'active' or error code on failure, where -EAGAIN means it may be safe to attempt to @@ -331,17 +339,17 @@ drivers/base/power/runtime.c and include/linux/pm_runtime.h: checked additionally, and -EACCES means that 'power.disable_depth' is different from 0 - int pm_request_idle(struct device *dev); + `int pm_request_idle(struct device *dev);` - submit a request to execute the subsystem-level idle callback for the device (the request is represented by a work item in pm_wq); returns 0 on success or error code if the request has not been queued up - int pm_request_autosuspend(struct device *dev); + `int pm_request_autosuspend(struct device *dev);` - schedule the execution of the subsystem-level suspend callback for the device when the autosuspend delay has expired; if the delay has already expired then the work item is queued up immediately - int pm_schedule_suspend(struct device *dev, unsigned int delay); + `int pm_schedule_suspend(struct device *dev, unsigned int delay);` - schedule the execution of the subsystem-level suspend callback for the device in future, where 'delay' is the time to wait before queuing up a suspend work item in pm_wq, in milliseconds (if 'delay' is zero, the work @@ -351,58 +359,58 @@ drivers/base/power/runtime.c and include/linux/pm_runtime.h: ->runtime_suspend() is already scheduled and not yet expired, the new value of 'delay' will be used as the time to wait - int pm_request_resume(struct device *dev); + `int pm_request_resume(struct device *dev);` - submit a request to execute the subsystem-level resume callback for the device (the request is represented by a work item in pm_wq); returns 0 on success, 1 if the device's runtime PM status was already 'active', or error code if the request hasn't been queued up - void pm_runtime_get_noresume(struct device *dev); + `void pm_runtime_get_noresume(struct device *dev);` - increment the device's usage counter - int pm_runtime_get(struct device *dev); + `int pm_runtime_get(struct device *dev);` - increment the device's usage counter, run pm_request_resume(dev) and return its result - int pm_runtime_get_sync(struct device *dev); + `int pm_runtime_get_sync(struct device *dev);` - increment the device's usage counter, run pm_runtime_resume(dev) and return its result - int pm_runtime_get_if_in_use(struct device *dev); + `int pm_runtime_get_if_in_use(struct device *dev);` - return -EINVAL if 'power.disable_depth' is nonzero; otherwise, if the runtime PM status is RPM_ACTIVE and the runtime PM usage counter is nonzero, increment the counter and return 1; otherwise return 0 without changing the counter - void pm_runtime_put_noidle(struct device *dev); + `void pm_runtime_put_noidle(struct device *dev);` - decrement the device's usage counter - int pm_runtime_put(struct device *dev); + `int pm_runtime_put(struct device *dev);` - decrement the device's usage counter; if the result is 0 then run pm_request_idle(dev) and return its result - int pm_runtime_put_autosuspend(struct device *dev); + `int pm_runtime_put_autosuspend(struct device *dev);` - decrement the device's usage counter; if the result is 0 then run pm_request_autosuspend(dev) and return its result - int pm_runtime_put_sync(struct device *dev); + `int pm_runtime_put_sync(struct device *dev);` - decrement the device's usage counter; if the result is 0 then run pm_runtime_idle(dev) and return its result - int pm_runtime_put_sync_suspend(struct device *dev); + `int pm_runtime_put_sync_suspend(struct device *dev);` - decrement the device's usage counter; if the result is 0 then run pm_runtime_suspend(dev) and return its result - int pm_runtime_put_sync_autosuspend(struct device *dev); + `int pm_runtime_put_sync_autosuspend(struct device *dev);` - decrement the device's usage counter; if the result is 0 then run pm_runtime_autosuspend(dev) and return its result - void pm_runtime_enable(struct device *dev); + `void pm_runtime_enable(struct device *dev);` - decrement the device's 'power.disable_depth' field; if that field is equal to zero, the runtime PM helper functions can execute subsystem-level callbacks described in Section 2 for the device - int pm_runtime_disable(struct device *dev); + `int pm_runtime_disable(struct device *dev);` - increment the device's 'power.disable_depth' field (if the value of that field was previously zero, this prevents subsystem-level runtime PM callbacks from being run for the device), make sure that all of the @@ -411,7 +419,7 @@ drivers/base/power/runtime.c and include/linux/pm_runtime.h: necessary to execute the subsystem-level resume callback for the device to satisfy that request, otherwise 0 is returned - int pm_runtime_barrier(struct device *dev); + `int pm_runtime_barrier(struct device *dev);` - check if there's a resume request pending for the device and resume it (synchronously) in that case, cancel any other pending runtime PM requests regarding it and wait for all runtime PM operations on it in progress to @@ -419,10 +427,10 @@ drivers/base/power/runtime.c and include/linux/pm_runtime.h: necessary to execute the subsystem-level resume callback for the device to satisfy that request, otherwise 0 is returned - void pm_suspend_ignore_children(struct device *dev, bool enable); + `void pm_suspend_ignore_children(struct device *dev, bool enable);` - set/unset the power.ignore_children flag of the device - int pm_runtime_set_active(struct device *dev); + `int pm_runtime_set_active(struct device *dev);` - clear the device's 'power.runtime_error' flag, set the device's runtime PM status to 'active' and update its parent's counter of 'active' children as appropriate (it is only valid to use this function if @@ -430,61 +438,61 @@ drivers/base/power/runtime.c and include/linux/pm_runtime.h: zero); it will fail and return error code if the device has a parent which is not active and the 'power.ignore_children' flag of which is unset - void pm_runtime_set_suspended(struct device *dev); + `void pm_runtime_set_suspended(struct device *dev);` - clear the device's 'power.runtime_error' flag, set the device's runtime PM status to 'suspended' and update its parent's counter of 'active' children as appropriate (it is only valid to use this function if 'power.runtime_error' is set or 'power.disable_depth' is greater than zero) - bool pm_runtime_active(struct device *dev); + `bool pm_runtime_active(struct device *dev);` - return true if the device's runtime PM status is 'active' or its 'power.disable_depth' field is not equal to zero, or false otherwise - bool pm_runtime_suspended(struct device *dev); + `bool pm_runtime_suspended(struct device *dev);` - return true if the device's runtime PM status is 'suspended' and its 'power.disable_depth' field is equal to zero, or false otherwise - bool pm_runtime_status_suspended(struct device *dev); + `bool pm_runtime_status_suspended(struct device *dev);` - return true if the device's runtime PM status is 'suspended' - void pm_runtime_allow(struct device *dev); + `void pm_runtime_allow(struct device *dev);` - set the power.runtime_auto flag for the device and decrease its usage counter (used by the /sys/devices/.../power/control interface to effectively allow the device to be power managed at run time) - void pm_runtime_forbid(struct device *dev); + `void pm_runtime_forbid(struct device *dev);` - unset the power.runtime_auto flag for the device and increase its usage counter (used by the /sys/devices/.../power/control interface to effectively prevent the device from being power managed at run time) - void pm_runtime_no_callbacks(struct device *dev); + `void pm_runtime_no_callbacks(struct device *dev);` - set the power.no_callbacks flag for the device and remove the runtime PM attributes from /sys/devices/.../power (or prevent them from being added when the device is registered) - void pm_runtime_irq_safe(struct device *dev); + `void pm_runtime_irq_safe(struct device *dev);` - set the power.irq_safe flag for the device, causing the runtime-PM callbacks to be invoked with interrupts off - bool pm_runtime_is_irq_safe(struct device *dev); + `bool pm_runtime_is_irq_safe(struct device *dev);` - return true if power.irq_safe flag was set for the device, causing the runtime-PM callbacks to be invoked with interrupts off - void pm_runtime_mark_last_busy(struct device *dev); + `void pm_runtime_mark_last_busy(struct device *dev);` - set the power.last_busy field to the current time - void pm_runtime_use_autosuspend(struct device *dev); + `void pm_runtime_use_autosuspend(struct device *dev);` - set the power.use_autosuspend flag, enabling autosuspend delays; call pm_runtime_get_sync if the flag was previously cleared and power.autosuspend_delay is negative - void pm_runtime_dont_use_autosuspend(struct device *dev); + `void pm_runtime_dont_use_autosuspend(struct device *dev);` - clear the power.use_autosuspend flag, disabling autosuspend delays; decrement the device's usage counter if the flag was previously set and power.autosuspend_delay is negative; call pm_runtime_idle - void pm_runtime_set_autosuspend_delay(struct device *dev, int delay); + `void pm_runtime_set_autosuspend_delay(struct device *dev, int delay);` - set the power.autosuspend_delay value to 'delay' (expressed in milliseconds); if 'delay' is negative then runtime suspends are prevented; if power.use_autosuspend is set, pm_runtime_get_sync may be @@ -493,7 +501,7 @@ drivers/base/power/runtime.c and include/linux/pm_runtime.h: changed to or from a negative value; if power.use_autosuspend is clear, pm_runtime_idle is called - unsigned long pm_runtime_autosuspend_expiration(struct device *dev); + `unsigned long pm_runtime_autosuspend_expiration(struct device *dev);` - calculate the time when the current autosuspend delay period will expire, based on power.last_busy and power.autosuspend_delay; if the delay time is 1000 ms or larger then the expiration time is rounded up to the @@ -503,36 +511,37 @@ drivers/base/power/runtime.c and include/linux/pm_runtime.h: It is safe to execute the following helper functions from interrupt context: -pm_request_idle() -pm_request_autosuspend() -pm_schedule_suspend() -pm_request_resume() -pm_runtime_get_noresume() -pm_runtime_get() -pm_runtime_put_noidle() -pm_runtime_put() -pm_runtime_put_autosuspend() -pm_runtime_enable() -pm_suspend_ignore_children() -pm_runtime_set_active() -pm_runtime_set_suspended() -pm_runtime_suspended() -pm_runtime_mark_last_busy() -pm_runtime_autosuspend_expiration() +- pm_request_idle() +- pm_request_autosuspend() +- pm_schedule_suspend() +- pm_request_resume() +- pm_runtime_get_noresume() +- pm_runtime_get() +- pm_runtime_put_noidle() +- pm_runtime_put() +- pm_runtime_put_autosuspend() +- pm_runtime_enable() +- pm_suspend_ignore_children() +- pm_runtime_set_active() +- pm_runtime_set_suspended() +- pm_runtime_suspended() +- pm_runtime_mark_last_busy() +- pm_runtime_autosuspend_expiration() If pm_runtime_irq_safe() has been called for a device then the following helper functions may also be used in interrupt context: -pm_runtime_idle() -pm_runtime_suspend() -pm_runtime_autosuspend() -pm_runtime_resume() -pm_runtime_get_sync() -pm_runtime_put_sync() -pm_runtime_put_sync_suspend() -pm_runtime_put_sync_autosuspend() +- pm_runtime_idle() +- pm_runtime_suspend() +- pm_runtime_autosuspend() +- pm_runtime_resume() +- pm_runtime_get_sync() +- pm_runtime_put_sync() +- pm_runtime_put_sync_suspend() +- pm_runtime_put_sync_autosuspend() 5. Runtime PM Initialization, Device Probing and Removal +======================================================== Initially, the runtime PM is disabled for all devices, which means that the majority of the runtime PM helper functions described in Section 4 will return @@ -608,6 +617,7 @@ manage the device at run time, the driver may confuse it by using pm_runtime_forbid() this way. 6. Runtime PM and System Sleep +============================== Runtime PM and system sleep (i.e., system suspend and hibernation, also known as suspend-to-RAM and suspend-to-disk) interact with each other in a couple of @@ -647,9 +657,9 @@ brought back to full power during resume, then its runtime PM status will have to be updated to reflect the actual post-system sleep status. The way to do this is: - pm_runtime_disable(dev); - pm_runtime_set_active(dev); - pm_runtime_enable(dev); + - pm_runtime_disable(dev); + - pm_runtime_set_active(dev); + - pm_runtime_enable(dev); The PM core always increments the runtime usage counter before calling the ->suspend() callback and decrements it after calling the ->resume() callback. @@ -705,66 +715,66 @@ Subsystems may wish to conserve code space by using the set of generic power management callbacks provided by the PM core, defined in driver/base/power/generic_ops.c: - int pm_generic_runtime_suspend(struct device *dev); + `int pm_generic_runtime_suspend(struct device *dev);` - invoke the ->runtime_suspend() callback provided by the driver of this device and return its result, or return 0 if not defined - int pm_generic_runtime_resume(struct device *dev); + `int pm_generic_runtime_resume(struct device *dev);` - invoke the ->runtime_resume() callback provided by the driver of this device and return its result, or return 0 if not defined - int pm_generic_suspend(struct device *dev); + `int pm_generic_suspend(struct device *dev);` - if the device has not been suspended at run time, invoke the ->suspend() callback provided by its driver and return its result, or return 0 if not defined - int pm_generic_suspend_noirq(struct device *dev); + `int pm_generic_suspend_noirq(struct device *dev);` - if pm_runtime_suspended(dev) returns "false", invoke the ->suspend_noirq() callback provided by the device's driver and return its result, or return 0 if not defined - int pm_generic_resume(struct device *dev); + `int pm_generic_resume(struct device *dev);` - invoke the ->resume() callback provided by the driver of this device and, if successful, change the device's runtime PM status to 'active' - int pm_generic_resume_noirq(struct device *dev); + `int pm_generic_resume_noirq(struct device *dev);` - invoke the ->resume_noirq() callback provided by the driver of this device - int pm_generic_freeze(struct device *dev); + `int pm_generic_freeze(struct device *dev);` - if the device has not been suspended at run time, invoke the ->freeze() callback provided by its driver and return its result, or return 0 if not defined - int pm_generic_freeze_noirq(struct device *dev); + `int pm_generic_freeze_noirq(struct device *dev);` - if pm_runtime_suspended(dev) returns "false", invoke the ->freeze_noirq() callback provided by the device's driver and return its result, or return 0 if not defined - int pm_generic_thaw(struct device *dev); + `int pm_generic_thaw(struct device *dev);` - if the device has not been suspended at run time, invoke the ->thaw() callback provided by its driver and return its result, or return 0 if not defined - int pm_generic_thaw_noirq(struct device *dev); + `int pm_generic_thaw_noirq(struct device *dev);` - if pm_runtime_suspended(dev) returns "false", invoke the ->thaw_noirq() callback provided by the device's driver and return its result, or return 0 if not defined - int pm_generic_poweroff(struct device *dev); + `int pm_generic_poweroff(struct device *dev);` - if the device has not been suspended at run time, invoke the ->poweroff() callback provided by its driver and return its result, or return 0 if not defined - int pm_generic_poweroff_noirq(struct device *dev); + `int pm_generic_poweroff_noirq(struct device *dev);` - if pm_runtime_suspended(dev) returns "false", run the ->poweroff_noirq() callback provided by the device's driver and return its result, or return 0 if not defined - int pm_generic_restore(struct device *dev); + `int pm_generic_restore(struct device *dev);` - invoke the ->restore() callback provided by the driver of this device and, if successful, change the device's runtime PM status to 'active' - int pm_generic_restore_noirq(struct device *dev); + `int pm_generic_restore_noirq(struct device *dev);` - invoke the ->restore_noirq() callback provided by the device's driver These functions are the defaults used by the PM core, if a subsystem doesn't @@ -781,6 +791,7 @@ UNIVERSAL_DEV_PM_OPS macro defined in include/linux/pm.h (possibly setting its last argument to NULL). 8. "No-Callback" Devices +======================== Some "devices" are only logical sub-devices of their parent and cannot be power-managed on their own. (The prototype example is a USB interface. Entire @@ -807,6 +818,7 @@ parent must take responsibility for telling the device's driver when the parent's power state changes. 9. Autosuspend, or automatically-delayed suspends +================================================= Changing a device's power state isn't free; it requires both time and energy. A device should be put in a low-power state only when there's some reason to @@ -832,8 +844,8 @@ registration the length should be controlled by user space, using the In order to use autosuspend, subsystems or drivers must call pm_runtime_use_autosuspend() (preferably before registering the device), and -thereafter they should use the various *_autosuspend() helper functions instead -of the non-autosuspend counterparts: +thereafter they should use the various `*_autosuspend()` helper functions +instead of the non-autosuspend counterparts:: Instead of: pm_runtime_suspend use: pm_runtime_autosuspend; Instead of: pm_schedule_suspend use: pm_request_autosuspend; @@ -858,7 +870,7 @@ The implementation is well suited for asynchronous use in interrupt contexts. However such use inevitably involves races, because the PM core can't synchronize ->runtime_suspend() callbacks with the arrival of I/O requests. This synchronization must be handled by the driver, using its private lock. -Here is a schematic pseudo-code example: +Here is a schematic pseudo-code example:: foo_read_or_write(struct foo_priv *foo, void *data) { diff --git a/Documentation/power/s2ram.txt b/Documentation/power/s2ram.rst index 4685aee197fd..d739aa7c742c 100644 --- a/Documentation/power/s2ram.txt +++ b/Documentation/power/s2ram.rst @@ -1,7 +1,9 @@ - How to get s2ram working - ~~~~~~~~~~~~~~~~~~~~~~~~ - 2006 Linus Torvalds - 2006 Pavel Machek +======================== +How to get s2ram working +======================== + +2006 Linus Torvalds +2006 Pavel Machek 1) Check suspend.sf.net, program s2ram there has long whitelist of "known ok" machines, along with tricks to use on each one. @@ -12,8 +14,8 @@ 3) You can use Linus' TRACE_RESUME infrastructure, described below. - Using TRACE_RESUME - ~~~~~~~~~~~~~~~~~~ +Using TRACE_RESUME +~~~~~~~~~~~~~~~~~~ I've been working at making the machines I have able to STR, and almost always it's a driver that is buggy. Thank God for the suspend/resume @@ -27,7 +29,7 @@ machine that doesn't boot) is: - enable PM_DEBUG, and PM_TRACE - - use a script like this: + - use a script like this:: #!/bin/sh sync @@ -38,7 +40,7 @@ machine that doesn't boot) is: - if it doesn't come back up (which is usually the problem), reboot by holding the power button down, and look at the dmesg output for things - like + like:: Magic number: 4:156:725 hash matches drivers/base/power/resume.c:28 @@ -52,7 +54,7 @@ machine that doesn't boot) is: If no device matches the hash (or any matches appear to be false positives), the culprit may be a device from a loadable kernel module that is not loaded until after the hash is checked. You can check the hash against the current - devices again after more modules are loaded using sysfs: + devices again after more modules are loaded using sysfs:: cat /sys/power/pm_trace_dev_match diff --git a/Documentation/power/suspend-and-cpuhotplug.txt b/Documentation/power/suspend-and-cpuhotplug.rst index a8751b8df10e..7ac8e1f549f4 100644 --- a/Documentation/power/suspend-and-cpuhotplug.txt +++ b/Documentation/power/suspend-and-cpuhotplug.rst @@ -1,10 +1,15 @@ +==================================================================== Interaction of Suspend code (S3) with the CPU hotplug infrastructure +==================================================================== - (C) 2011 - 2014 Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com> +(C) 2011 - 2014 Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com> -I. How does the regular CPU hotplug code differ from how the Suspend-to-RAM - infrastructure uses it internally? And where do they share common code? +I. Differences between CPU hotplug and Suspend-to-RAM +====================================================== + +How does the regular CPU hotplug code differ from how the Suspend-to-RAM +infrastructure uses it internally? And where do they share common code? Well, a picture is worth a thousand words... So ASCII art follows :-) @@ -16,13 +21,13 @@ of describing where they take different paths and where they share code. What happens when regular CPU hotplug and Suspend-to-RAM race with each other is not depicted here.] -On a high level, the suspend-resume cycle goes like this: +On a high level, the suspend-resume cycle goes like this:: -|Freeze| -> |Disable nonboot| -> |Do suspend| -> |Enable nonboot| -> |Thaw | -|tasks | | cpus | | | | cpus | |tasks| + |Freeze| -> |Disable nonboot| -> |Do suspend| -> |Enable nonboot| -> |Thaw | + |tasks | | cpus | | | | cpus | |tasks| -More details follow: +More details follow:: Suspend call path ----------------- @@ -87,7 +92,9 @@ More details follow: Resuming back is likewise, with the counterparts being (in the order of execution during resume): -* enable_nonboot_cpus() which involves: + +* enable_nonboot_cpus() which involves:: + | Acquire cpu_add_remove_lock | Decrease cpu_hotplug_disabled, thereby enabling regular cpu hotplug | Call _cpu_up() [for all those cpus in the frozen_cpus mask, in a loop] @@ -103,6 +110,8 @@ It is to be noted here that the system_transition_mutex lock is acquired at the beginning, when we are just starting out to suspend, and then released only after the entire cycle is complete (i.e., suspend + resume). +:: + Regular CPU hotplug call path @@ -152,16 +161,16 @@ with the 'tasks_frozen' argument set to 1. Important files and functions/entry points: ------------------------------------------- +------------------------------------------- -kernel/power/process.c : freeze_processes(), thaw_processes() -kernel/power/suspend.c : suspend_prepare(), suspend_enter(), suspend_finish() -kernel/cpu.c: cpu_[up|down](), _cpu_[up|down](), [disable|enable]_nonboot_cpus() +- kernel/power/process.c : freeze_processes(), thaw_processes() +- kernel/power/suspend.c : suspend_prepare(), suspend_enter(), suspend_finish() +- kernel/cpu.c: cpu_[up|down](), _cpu_[up|down](), [disable|enable]_nonboot_cpus() II. What are the issues involved in CPU hotplug? - ------------------------------------------- +------------------------------------------------ There are some interesting situations involving CPU hotplug and microcode update on the CPUs, as discussed below: @@ -243,8 +252,11 @@ d. Handling microcode update during suspend/hibernate: cycles). -III. Are there any known problems when regular CPU hotplug and suspend race - with each other? +III. Known problems +=================== + +Are there any known problems when regular CPU hotplug and suspend race +with each other? Yes, they are listed below: diff --git a/Documentation/power/suspend-and-interrupts.txt b/Documentation/power/suspend-and-interrupts.rst index 8afb29a8604a..4cda6617709a 100644 --- a/Documentation/power/suspend-and-interrupts.txt +++ b/Documentation/power/suspend-and-interrupts.rst @@ -1,4 +1,6 @@ +==================================== System Suspend and Device Interrupts +==================================== Copyright (C) 2014 Intel Corp. Author: Rafael J. Wysocki <rafael.j.wysocki@intel.com> diff --git a/Documentation/power/swsusp-and-swap-files.txt b/Documentation/power/swsusp-and-swap-files.rst index f281886de490..a33a2919dbe4 100644 --- a/Documentation/power/swsusp-and-swap-files.txt +++ b/Documentation/power/swsusp-and-swap-files.rst @@ -1,4 +1,7 @@ +=============================================== Using swap files with software suspend (swsusp) +=============================================== + (C) 2006 Rafael J. Wysocki <rjw@sisk.pl> The Linux kernel handles swap files almost in the same way as it handles swap @@ -21,20 +24,20 @@ units. In order to use a swap file with swsusp, you need to: -1) Create the swap file and make it active, eg. +1) Create the swap file and make it active, eg.:: -# dd if=/dev/zero of=<swap_file_path> bs=1024 count=<swap_file_size_in_k> -# mkswap <swap_file_path> -# swapon <swap_file_path> + # dd if=/dev/zero of=<swap_file_path> bs=1024 count=<swap_file_size_in_k> + # mkswap <swap_file_path> + # swapon <swap_file_path> 2) Use an application that will bmap the swap file with the help of the FIBMAP ioctl and determine the location of the file's swap header, as the offset, in <PAGE_SIZE> units, from the beginning of the partition which holds the swap file. -3) Add the following parameters to the kernel command line: +3) Add the following parameters to the kernel command line:: -resume=<swap_file_partition> resume_offset=<swap_file_offset> + resume=<swap_file_partition> resume_offset=<swap_file_offset> where <swap_file_partition> is the partition on which the swap file is located and <swap_file_offset> is the offset of the swap header determined by the @@ -46,7 +49,7 @@ OR Use a userland suspend application that will set the partition and offset with the help of the SNAPSHOT_SET_SWAP_AREA ioctl described in -Documentation/power/userland-swsusp.txt (this is the only method to suspend +Documentation/power/userland-swsusp.rst (this is the only method to suspend to a swap file allowing the resume to be initiated from an initrd or initramfs image). diff --git a/Documentation/power/swsusp-dmcrypt.txt b/Documentation/power/swsusp-dmcrypt.rst index b802fbfd95ef..426df59172cd 100644 --- a/Documentation/power/swsusp-dmcrypt.txt +++ b/Documentation/power/swsusp-dmcrypt.rst @@ -1,13 +1,15 @@ +======================================= +How to use dm-crypt and swsusp together +======================================= + Author: Andreas Steinmetz <ast@domdv.de> -How to use dm-crypt and swsusp together: -======================================== Some prerequisites: You know how dm-crypt works. If not, visit the following web page: http://www.saout.de/misc/dm-crypt/ -You have read Documentation/power/swsusp.txt and understand it. +You have read Documentation/power/swsusp.rst and understand it. You did read Documentation/admin-guide/initrd.rst and know how an initrd works. You know how to create or how to modify an initrd. @@ -29,23 +31,23 @@ a way that the swap device you suspend to/resume from has always the same major/minor within the initrd as well as within your running system. The easiest way to achieve this is to always set up this swap device first with dmsetup, so that -it will always look like the following: +it will always look like the following:: -brw------- 1 root root 254, 0 Jul 28 13:37 /dev/mapper/swap0 + brw------- 1 root root 254, 0 Jul 28 13:37 /dev/mapper/swap0 Now set up your kernel to use /dev/mapper/swap0 as the default -resume partition, so your kernel .config contains: +resume partition, so your kernel .config contains:: -CONFIG_PM_STD_PARTITION="/dev/mapper/swap0" + CONFIG_PM_STD_PARTITION="/dev/mapper/swap0" Prepare your boot loader to use the initrd you will create or modify. For lilo the simplest setup looks like the following -lines: +lines:: -image=/boot/vmlinuz -initrd=/boot/initrd.gz -label=linux -append="root=/dev/ram0 init=/linuxrc rw" + image=/boot/vmlinuz + initrd=/boot/initrd.gz + label=linux + append="root=/dev/ram0 init=/linuxrc rw" Finally you need to create or modify your initrd. Lets assume you create an initrd that reads the required dm-crypt setup @@ -53,66 +55,66 @@ from a pcmcia flash disk card. The card is formatted with an ext2 fs which resides on /dev/hde1 when the card is inserted. The card contains at least the encrypted swap setup in a file named "swapkey". /etc/fstab of your initrd contains something -like the following: +like the following:: -/dev/hda1 /mnt ext3 ro 0 0 -none /proc proc defaults,noatime,nodiratime 0 0 -none /sys sysfs defaults,noatime,nodiratime 0 0 + /dev/hda1 /mnt ext3 ro 0 0 + none /proc proc defaults,noatime,nodiratime 0 0 + none /sys sysfs defaults,noatime,nodiratime 0 0 /dev/hda1 contains an unencrypted mini system that sets up all of your crypto devices, again by reading the setup from the pcmcia flash disk. What follows now is a /linuxrc for your initrd that allows you to resume from encrypted swap and that continues boot with your mini system on /dev/hda1 if resume -does not happen: - -#!/bin/sh -PATH=/sbin:/bin:/usr/sbin:/usr/bin -mount /proc -mount /sys -mapped=0 -noresume=`grep -c noresume /proc/cmdline` -if [ "$*" != "" ] -then - noresume=1 -fi -dmesg -n 1 -/sbin/cardmgr -q -for i in 1 2 3 4 5 6 7 8 9 0 -do - if [ -f /proc/ide/hde/media ] +does not happen:: + + #!/bin/sh + PATH=/sbin:/bin:/usr/sbin:/usr/bin + mount /proc + mount /sys + mapped=0 + noresume=`grep -c noresume /proc/cmdline` + if [ "$*" != "" ] then - usleep 500000 - mount -t ext2 -o ro /dev/hde1 /mnt - if [ -f /mnt/swapkey ] + noresume=1 + fi + dmesg -n 1 + /sbin/cardmgr -q + for i in 1 2 3 4 5 6 7 8 9 0 + do + if [ -f /proc/ide/hde/media ] then - dmsetup create swap0 /mnt/swapkey > /dev/null 2>&1 && mapped=1 + usleep 500000 + mount -t ext2 -o ro /dev/hde1 /mnt + if [ -f /mnt/swapkey ] + then + dmsetup create swap0 /mnt/swapkey > /dev/null 2>&1 && mapped=1 + fi + umount /mnt + break fi - umount /mnt - break - fi - usleep 500000 -done -killproc /sbin/cardmgr -dmesg -n 6 -if [ $mapped = 1 ] -then - if [ $noresume != 0 ] + usleep 500000 + done + killproc /sbin/cardmgr + dmesg -n 6 + if [ $mapped = 1 ] then - mkswap /dev/mapper/swap0 > /dev/null 2>&1 + if [ $noresume != 0 ] + then + mkswap /dev/mapper/swap0 > /dev/null 2>&1 + fi + echo 254:0 > /sys/power/resume + dmsetup remove swap0 fi - echo 254:0 > /sys/power/resume - dmsetup remove swap0 -fi -umount /sys -mount /mnt -umount /proc -cd /mnt -pivot_root . mnt -mount /proc -umount -l /mnt -umount /proc -exec chroot . /sbin/init $* < dev/console > dev/console 2>&1 + umount /sys + mount /mnt + umount /proc + cd /mnt + pivot_root . mnt + mount /proc + umount -l /mnt + umount /proc + exec chroot . /sbin/init $* < dev/console > dev/console 2>&1 Please don't mind the weird loop above, busybox's msh doesn't know the let statement. Now, what is happening in the script? diff --git a/Documentation/power/swsusp.rst b/Documentation/power/swsusp.rst new file mode 100644 index 000000000000..d000312f6965 --- /dev/null +++ b/Documentation/power/swsusp.rst @@ -0,0 +1,501 @@ +============ +Swap suspend +============ + +Some warnings, first. + +.. warning:: + + **BIG FAT WARNING** + + If you touch anything on disk between suspend and resume... + ...kiss your data goodbye. + + If you do resume from initrd after your filesystems are mounted... + ...bye bye root partition. + + [this is actually same case as above] + + If you have unsupported ( ) devices using DMA, you may have some + problems. If your disk driver does not support suspend... (IDE does), + it may cause some problems, too. If you change kernel command line + between suspend and resume, it may do something wrong. If you change + your hardware while system is suspended... well, it was not good idea; + but it will probably only crash. + + ( ) suspend/resume support is needed to make it safe. + + If you have any filesystems on USB devices mounted before software suspend, + they won't be accessible after resume and you may lose data, as though + you have unplugged the USB devices with mounted filesystems on them; + see the FAQ below for details. (This is not true for more traditional + power states like "standby", which normally don't turn USB off.) + +Swap partition: + You need to append resume=/dev/your_swap_partition to kernel command + line or specify it using /sys/power/resume. + +Swap file: + If using a swapfile you can also specify a resume offset using + resume_offset=<number> on the kernel command line or specify it + in /sys/power/resume_offset. + +After preparing then you suspend by:: + + echo shutdown > /sys/power/disk; echo disk > /sys/power/state + +- If you feel ACPI works pretty well on your system, you might try:: + + echo platform > /sys/power/disk; echo disk > /sys/power/state + +- If you would like to write hibernation image to swap and then suspend + to RAM (provided your platform supports it), you can try:: + + echo suspend > /sys/power/disk; echo disk > /sys/power/state + +- If you have SATA disks, you'll need recent kernels with SATA suspend + support. For suspend and resume to work, make sure your disk drivers + are built into kernel -- not modules. [There's way to make + suspend/resume with modular disk drivers, see FAQ, but you probably + should not do that.] + +If you want to limit the suspend image size to N bytes, do:: + + echo N > /sys/power/image_size + +before suspend (it is limited to around 2/5 of available RAM by default). + +- The resume process checks for the presence of the resume device, + if found, it then checks the contents for the hibernation image signature. + If both are found, it resumes the hibernation image. + +- The resume process may be triggered in two ways: + + 1) During lateinit: If resume=/dev/your_swap_partition is specified on + the kernel command line, lateinit runs the resume process. If the + resume device has not been probed yet, the resume process fails and + bootup continues. + 2) Manually from an initrd or initramfs: May be run from + the init script by using the /sys/power/resume file. It is vital + that this be done prior to remounting any filesystems (even as + read-only) otherwise data may be corrupted. + +Article about goals and implementation of Software Suspend for Linux +==================================================================== + +Author: Gábor Kuti +Last revised: 2003-10-20 by Pavel Machek + +Idea and goals to achieve +------------------------- + +Nowadays it is common in several laptops that they have a suspend button. It +saves the state of the machine to a filesystem or to a partition and switches +to standby mode. Later resuming the machine the saved state is loaded back to +ram and the machine can continue its work. It has two real benefits. First we +save ourselves the time machine goes down and later boots up, energy costs +are real high when running from batteries. The other gain is that we don't have +to interrupt our programs so processes that are calculating something for a long +time shouldn't need to be written interruptible. + +swsusp saves the state of the machine into active swaps and then reboots or +powerdowns. You must explicitly specify the swap partition to resume from with +`resume=` kernel option. If signature is found it loads and restores saved +state. If the option `noresume` is specified as a boot parameter, it skips +the resuming. If the option `hibernate=nocompress` is specified as a boot +parameter, it saves hibernation image without compression. + +In the meantime while the system is suspended you should not add/remove any +of the hardware, write to the filesystems, etc. + +Sleep states summary +==================== + +There are three different interfaces you can use, /proc/acpi should +work like this: + +In a really perfect world:: + + echo 1 > /proc/acpi/sleep # for standby + echo 2 > /proc/acpi/sleep # for suspend to ram + echo 3 > /proc/acpi/sleep # for suspend to ram, but with more power conservative + echo 4 > /proc/acpi/sleep # for suspend to disk + echo 5 > /proc/acpi/sleep # for shutdown unfriendly the system + +and perhaps:: + + echo 4b > /proc/acpi/sleep # for suspend to disk via s4bios + +Frequently Asked Questions +========================== + +Q: + well, suspending a server is IMHO a really stupid thing, + but... (Diego Zuccato): + +A: + You bought new UPS for your server. How do you install it without + bringing machine down? Suspend to disk, rearrange power cables, + resume. + + You have your server on UPS. Power died, and UPS is indicating 30 + seconds to failure. What do you do? Suspend to disk. + + +Q: + Maybe I'm missing something, but why don't the regular I/O paths work? + +A: + We do use the regular I/O paths. However we cannot restore the data + to its original location as we load it. That would create an + inconsistent kernel state which would certainly result in an oops. + Instead, we load the image into unused memory and then atomically copy + it back to it original location. This implies, of course, a maximum + image size of half the amount of memory. + + There are two solutions to this: + + * require half of memory to be free during suspend. That way you can + read "new" data onto free spots, then cli and copy + + * assume we had special "polling" ide driver that only uses memory + between 0-640KB. That way, I'd have to make sure that 0-640KB is free + during suspending, but otherwise it would work... + + suspend2 shares this fundamental limitation, but does not include user + data and disk caches into "used memory" by saving them in + advance. That means that the limitation goes away in practice. + +Q: + Does linux support ACPI S4? + +A: + Yes. That's what echo platform > /sys/power/disk does. + +Q: + What is 'suspend2'? + +A: + suspend2 is 'Software Suspend 2', a forked implementation of + suspend-to-disk which is available as separate patches for 2.4 and 2.6 + kernels from swsusp.sourceforge.net. It includes support for SMP, 4GB + highmem and preemption. It also has a extensible architecture that + allows for arbitrary transformations on the image (compression, + encryption) and arbitrary backends for writing the image (eg to swap + or an NFS share[Work In Progress]). Questions regarding suspend2 + should be sent to the mailing list available through the suspend2 + website, and not to the Linux Kernel Mailing List. We are working + toward merging suspend2 into the mainline kernel. + +Q: + What is the freezing of tasks and why are we using it? + +A: + The freezing of tasks is a mechanism by which user space processes and some + kernel threads are controlled during hibernation or system-wide suspend (on some + architectures). See freezing-of-tasks.txt for details. + +Q: + What is the difference between "platform" and "shutdown"? + +A: + shutdown: + save state in linux, then tell bios to powerdown + + platform: + save state in linux, then tell bios to powerdown and blink + "suspended led" + + "platform" is actually right thing to do where supported, but + "shutdown" is most reliable (except on ACPI systems). + +Q: + I do not understand why you have such strong objections to idea of + selective suspend. + +A: + Do selective suspend during runtime power management, that's okay. But + it's useless for suspend-to-disk. (And I do not see how you could use + it for suspend-to-ram, I hope you do not want that). + + Lets see, so you suggest to + + * SUSPEND all but swap device and parents + * Snapshot + * Write image to disk + * SUSPEND swap device and parents + * Powerdown + + Oh no, that does not work, if swap device or its parents uses DMA, + you've corrupted data. You'd have to do + + * SUSPEND all but swap device and parents + * FREEZE swap device and parents + * Snapshot + * UNFREEZE swap device and parents + * Write + * SUSPEND swap device and parents + + Which means that you still need that FREEZE state, and you get more + complicated code. (And I have not yet introduce details like system + devices). + +Q: + There don't seem to be any generally useful behavioral + distinctions between SUSPEND and FREEZE. + +A: + Doing SUSPEND when you are asked to do FREEZE is always correct, + but it may be unnecessarily slow. If you want your driver to stay simple, + slowness may not matter to you. It can always be fixed later. + + For devices like disk it does matter, you do not want to spindown for + FREEZE. + +Q: + After resuming, system is paging heavily, leading to very bad interactivity. + +A: + Try running:: + + cat /proc/[0-9]*/maps | grep / | sed 's:.* /:/:' | sort -u | while read file + do + test -f "$file" && cat "$file" > /dev/null + done + + after resume. swapoff -a; swapon -a may also be useful. + +Q: + What happens to devices during swsusp? They seem to be resumed + during system suspend? + +A: + That's correct. We need to resume them if we want to write image to + disk. Whole sequence goes like + + **Suspend part** + + running system, user asks for suspend-to-disk + + user processes are stopped + + suspend(PMSG_FREEZE): devices are frozen so that they don't interfere + with state snapshot + + state snapshot: copy of whole used memory is taken with interrupts disabled + + resume(): devices are woken up so that we can write image to swap + + write image to swap + + suspend(PMSG_SUSPEND): suspend devices so that we can power off + + turn the power off + + **Resume part** + + (is actually pretty similar) + + running system, user asks for suspend-to-disk + + user processes are stopped (in common case there are none, + but with resume-from-initrd, no one knows) + + read image from disk + + suspend(PMSG_FREEZE): devices are frozen so that they don't interfere + with image restoration + + image restoration: rewrite memory with image + + resume(): devices are woken up so that system can continue + + thaw all user processes + +Q: + What is this 'Encrypt suspend image' for? + +A: + First of all: it is not a replacement for dm-crypt encrypted swap. + It cannot protect your computer while it is suspended. Instead it does + protect from leaking sensitive data after resume from suspend. + + Think of the following: you suspend while an application is running + that keeps sensitive data in memory. The application itself prevents + the data from being swapped out. Suspend, however, must write these + data to swap to be able to resume later on. Without suspend encryption + your sensitive data are then stored in plaintext on disk. This means + that after resume your sensitive data are accessible to all + applications having direct access to the swap device which was used + for suspend. If you don't need swap after resume these data can remain + on disk virtually forever. Thus it can happen that your system gets + broken in weeks later and sensitive data which you thought were + encrypted and protected are retrieved and stolen from the swap device. + To prevent this situation you should use 'Encrypt suspend image'. + + During suspend a temporary key is created and this key is used to + encrypt the data written to disk. When, during resume, the data was + read back into memory the temporary key is destroyed which simply + means that all data written to disk during suspend are then + inaccessible so they can't be stolen later on. The only thing that + you must then take care of is that you call 'mkswap' for the swap + partition used for suspend as early as possible during regular + boot. This asserts that any temporary key from an oopsed suspend or + from a failed or aborted resume is erased from the swap device. + + As a rule of thumb use encrypted swap to protect your data while your + system is shut down or suspended. Additionally use the encrypted + suspend image to prevent sensitive data from being stolen after + resume. + +Q: + Can I suspend to a swap file? + +A: + Generally, yes, you can. However, it requires you to use the "resume=" and + "resume_offset=" kernel command line parameters, so the resume from a swap file + cannot be initiated from an initrd or initramfs image. See + swsusp-and-swap-files.txt for details. + +Q: + Is there a maximum system RAM size that is supported by swsusp? + +A: + It should work okay with highmem. + +Q: + Does swsusp (to disk) use only one swap partition or can it use + multiple swap partitions (aggregate them into one logical space)? + +A: + Only one swap partition, sorry. + +Q: + If my application(s) causes lots of memory & swap space to be used + (over half of the total system RAM), is it correct that it is likely + to be useless to try to suspend to disk while that app is running? + +A: + No, it should work okay, as long as your app does not mlock() + it. Just prepare big enough swap partition. + +Q: + What information is useful for debugging suspend-to-disk problems? + +A: + Well, last messages on the screen are always useful. If something + is broken, it is usually some kernel driver, therefore trying with as + little as possible modules loaded helps a lot. I also prefer people to + suspend from console, preferably without X running. Booting with + init=/bin/bash, then swapon and starting suspend sequence manually + usually does the trick. Then it is good idea to try with latest + vanilla kernel. + +Q: + How can distributions ship a swsusp-supporting kernel with modular + disk drivers (especially SATA)? + +A: + Well, it can be done, load the drivers, then do echo into + /sys/power/resume file from initrd. Be sure not to mount + anything, not even read-only mount, or you are going to lose your + data. + +Q: + How do I make suspend more verbose? + +A: + If you want to see any non-error kernel messages on the virtual + terminal the kernel switches to during suspend, you have to set the + kernel console loglevel to at least 4 (KERN_WARNING), for example by + doing:: + + # save the old loglevel + read LOGLEVEL DUMMY < /proc/sys/kernel/printk + # set the loglevel so we see the progress bar. + # if the level is higher than needed, we leave it alone. + if [ $LOGLEVEL -lt 5 ]; then + echo 5 > /proc/sys/kernel/printk + fi + + IMG_SZ=0 + read IMG_SZ < /sys/power/image_size + echo -n disk > /sys/power/state + RET=$? + # + # the logic here is: + # if image_size > 0 (without kernel support, IMG_SZ will be zero), + # then try again with image_size set to zero. + if [ $RET -ne 0 -a $IMG_SZ -ne 0 ]; then # try again with minimal image size + echo 0 > /sys/power/image_size + echo -n disk > /sys/power/state + RET=$? + fi + + # restore previous loglevel + echo $LOGLEVEL > /proc/sys/kernel/printk + exit $RET + +Q: + Is this true that if I have a mounted filesystem on a USB device and + I suspend to disk, I can lose data unless the filesystem has been mounted + with "sync"? + +A: + That's right ... if you disconnect that device, you may lose data. + In fact, even with "-o sync" you can lose data if your programs have + information in buffers they haven't written out to a disk you disconnect, + or if you disconnect before the device finished saving data you wrote. + + Software suspend normally powers down USB controllers, which is equivalent + to disconnecting all USB devices attached to your system. + + Your system might well support low-power modes for its USB controllers + while the system is asleep, maintaining the connection, using true sleep + modes like "suspend-to-RAM" or "standby". (Don't write "disk" to the + /sys/power/state file; write "standby" or "mem".) We've not seen any + hardware that can use these modes through software suspend, although in + theory some systems might support "platform" modes that won't break the + USB connections. + + Remember that it's always a bad idea to unplug a disk drive containing a + mounted filesystem. That's true even when your system is asleep! The + safest thing is to unmount all filesystems on removable media (such USB, + Firewire, CompactFlash, MMC, external SATA, or even IDE hotplug bays) + before suspending; then remount them after resuming. + + There is a work-around for this problem. For more information, see + Documentation/driver-api/usb/persist.rst. + +Q: + Can I suspend-to-disk using a swap partition under LVM? + +A: + Yes and No. You can suspend successfully, but the kernel will not be able + to resume on its own. You need an initramfs that can recognize the resume + situation, activate the logical volume containing the swap volume (but not + touch any filesystems!), and eventually call:: + + echo -n "$major:$minor" > /sys/power/resume + + where $major and $minor are the respective major and minor device numbers of + the swap volume. + + uswsusp works with LVM, too. See http://suspend.sourceforge.net/ + +Q: + I upgraded the kernel from 2.6.15 to 2.6.16. Both kernels were + compiled with the similar configuration files. Anyway I found that + suspend to disk (and resume) is much slower on 2.6.16 compared to + 2.6.15. Any idea for why that might happen or how can I speed it up? + +A: + This is because the size of the suspend image is now greater than + for 2.6.15 (by saving more data we can get more responsive system + after resume). + + There's the /sys/power/image_size knob that controls the size of the + image. If you set it to 0 (eg. by echo 0 > /sys/power/image_size as + root), the 2.6.15 behavior should be restored. If it is still too + slow, take a look at suspend.sf.net -- userland suspend is faster and + supports LZF compression to speed it up further. diff --git a/Documentation/power/swsusp.txt b/Documentation/power/swsusp.txt deleted file mode 100644 index 236d1fb13640..000000000000 --- a/Documentation/power/swsusp.txt +++ /dev/null @@ -1,446 +0,0 @@ -Some warnings, first. - - * BIG FAT WARNING ********************************************************* - * - * If you touch anything on disk between suspend and resume... - * ...kiss your data goodbye. - * - * If you do resume from initrd after your filesystems are mounted... - * ...bye bye root partition. - * [this is actually same case as above] - * - * If you have unsupported (*) devices using DMA, you may have some - * problems. If your disk driver does not support suspend... (IDE does), - * it may cause some problems, too. If you change kernel command line - * between suspend and resume, it may do something wrong. If you change - * your hardware while system is suspended... well, it was not good idea; - * but it will probably only crash. - * - * (*) suspend/resume support is needed to make it safe. - * - * If you have any filesystems on USB devices mounted before software suspend, - * they won't be accessible after resume and you may lose data, as though - * you have unplugged the USB devices with mounted filesystems on them; - * see the FAQ below for details. (This is not true for more traditional - * power states like "standby", which normally don't turn USB off.) - -Swap partition: -You need to append resume=/dev/your_swap_partition to kernel command -line or specify it using /sys/power/resume. - -Swap file: -If using a swapfile you can also specify a resume offset using -resume_offset=<number> on the kernel command line or specify it -in /sys/power/resume_offset. - -After preparing then you suspend by - -echo shutdown > /sys/power/disk; echo disk > /sys/power/state - -. If you feel ACPI works pretty well on your system, you might try - -echo platform > /sys/power/disk; echo disk > /sys/power/state - -. If you would like to write hibernation image to swap and then suspend -to RAM (provided your platform supports it), you can try - -echo suspend > /sys/power/disk; echo disk > /sys/power/state - -. If you have SATA disks, you'll need recent kernels with SATA suspend -support. For suspend and resume to work, make sure your disk drivers -are built into kernel -- not modules. [There's way to make -suspend/resume with modular disk drivers, see FAQ, but you probably -should not do that.] - -If you want to limit the suspend image size to N bytes, do - -echo N > /sys/power/image_size - -before suspend (it is limited to around 2/5 of available RAM by default). - -. The resume process checks for the presence of the resume device, -if found, it then checks the contents for the hibernation image signature. -If both are found, it resumes the hibernation image. - -. The resume process may be triggered in two ways: - 1) During lateinit: If resume=/dev/your_swap_partition is specified on - the kernel command line, lateinit runs the resume process. If the - resume device has not been probed yet, the resume process fails and - bootup continues. - 2) Manually from an initrd or initramfs: May be run from - the init script by using the /sys/power/resume file. It is vital - that this be done prior to remounting any filesystems (even as - read-only) otherwise data may be corrupted. - -Article about goals and implementation of Software Suspend for Linux -~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ -Author: Gábor Kuti -Last revised: 2003-10-20 by Pavel Machek - -Idea and goals to achieve - -Nowadays it is common in several laptops that they have a suspend button. It -saves the state of the machine to a filesystem or to a partition and switches -to standby mode. Later resuming the machine the saved state is loaded back to -ram and the machine can continue its work. It has two real benefits. First we -save ourselves the time machine goes down and later boots up, energy costs -are real high when running from batteries. The other gain is that we don't have to -interrupt our programs so processes that are calculating something for a long -time shouldn't need to be written interruptible. - -swsusp saves the state of the machine into active swaps and then reboots or -powerdowns. You must explicitly specify the swap partition to resume from with -``resume='' kernel option. If signature is found it loads and restores saved -state. If the option ``noresume'' is specified as a boot parameter, it skips -the resuming. If the option ``hibernate=nocompress'' is specified as a boot -parameter, it saves hibernation image without compression. - -In the meantime while the system is suspended you should not add/remove any -of the hardware, write to the filesystems, etc. - -Sleep states summary -==================== - -There are three different interfaces you can use, /proc/acpi should -work like this: - -In a really perfect world: -echo 1 > /proc/acpi/sleep # for standby -echo 2 > /proc/acpi/sleep # for suspend to ram -echo 3 > /proc/acpi/sleep # for suspend to ram, but with more power conservative -echo 4 > /proc/acpi/sleep # for suspend to disk -echo 5 > /proc/acpi/sleep # for shutdown unfriendly the system - -and perhaps -echo 4b > /proc/acpi/sleep # for suspend to disk via s4bios - -Frequently Asked Questions -========================== - -Q: well, suspending a server is IMHO a really stupid thing, -but... (Diego Zuccato): - -A: You bought new UPS for your server. How do you install it without -bringing machine down? Suspend to disk, rearrange power cables, -resume. - -You have your server on UPS. Power died, and UPS is indicating 30 -seconds to failure. What do you do? Suspend to disk. - - -Q: Maybe I'm missing something, but why don't the regular I/O paths work? - -A: We do use the regular I/O paths. However we cannot restore the data -to its original location as we load it. That would create an -inconsistent kernel state which would certainly result in an oops. -Instead, we load the image into unused memory and then atomically copy -it back to it original location. This implies, of course, a maximum -image size of half the amount of memory. - -There are two solutions to this: - -* require half of memory to be free during suspend. That way you can -read "new" data onto free spots, then cli and copy - -* assume we had special "polling" ide driver that only uses memory -between 0-640KB. That way, I'd have to make sure that 0-640KB is free -during suspending, but otherwise it would work... - -suspend2 shares this fundamental limitation, but does not include user -data and disk caches into "used memory" by saving them in -advance. That means that the limitation goes away in practice. - -Q: Does linux support ACPI S4? - -A: Yes. That's what echo platform > /sys/power/disk does. - -Q: What is 'suspend2'? - -A: suspend2 is 'Software Suspend 2', a forked implementation of -suspend-to-disk which is available as separate patches for 2.4 and 2.6 -kernels from swsusp.sourceforge.net. It includes support for SMP, 4GB -highmem and preemption. It also has a extensible architecture that -allows for arbitrary transformations on the image (compression, -encryption) and arbitrary backends for writing the image (eg to swap -or an NFS share[Work In Progress]). Questions regarding suspend2 -should be sent to the mailing list available through the suspend2 -website, and not to the Linux Kernel Mailing List. We are working -toward merging suspend2 into the mainline kernel. - -Q: What is the freezing of tasks and why are we using it? - -A: The freezing of tasks is a mechanism by which user space processes and some -kernel threads are controlled during hibernation or system-wide suspend (on some -architectures). See freezing-of-tasks.txt for details. - -Q: What is the difference between "platform" and "shutdown"? - -A: - -shutdown: save state in linux, then tell bios to powerdown - -platform: save state in linux, then tell bios to powerdown and blink - "suspended led" - -"platform" is actually right thing to do where supported, but -"shutdown" is most reliable (except on ACPI systems). - -Q: I do not understand why you have such strong objections to idea of -selective suspend. - -A: Do selective suspend during runtime power management, that's okay. But -it's useless for suspend-to-disk. (And I do not see how you could use -it for suspend-to-ram, I hope you do not want that). - -Lets see, so you suggest to - -* SUSPEND all but swap device and parents -* Snapshot -* Write image to disk -* SUSPEND swap device and parents -* Powerdown - -Oh no, that does not work, if swap device or its parents uses DMA, -you've corrupted data. You'd have to do - -* SUSPEND all but swap device and parents -* FREEZE swap device and parents -* Snapshot -* UNFREEZE swap device and parents -* Write -* SUSPEND swap device and parents - -Which means that you still need that FREEZE state, and you get more -complicated code. (And I have not yet introduce details like system -devices). - -Q: There don't seem to be any generally useful behavioral -distinctions between SUSPEND and FREEZE. - -A: Doing SUSPEND when you are asked to do FREEZE is always correct, -but it may be unnecessarily slow. If you want your driver to stay simple, -slowness may not matter to you. It can always be fixed later. - -For devices like disk it does matter, you do not want to spindown for -FREEZE. - -Q: After resuming, system is paging heavily, leading to very bad interactivity. - -A: Try running - -cat /proc/[0-9]*/maps | grep / | sed 's:.* /:/:' | sort -u | while read file -do - test -f "$file" && cat "$file" > /dev/null -done - -after resume. swapoff -a; swapon -a may also be useful. - -Q: What happens to devices during swsusp? They seem to be resumed -during system suspend? - -A: That's correct. We need to resume them if we want to write image to -disk. Whole sequence goes like - - Suspend part - ~~~~~~~~~~~~ - running system, user asks for suspend-to-disk - - user processes are stopped - - suspend(PMSG_FREEZE): devices are frozen so that they don't interfere - with state snapshot - - state snapshot: copy of whole used memory is taken with interrupts disabled - - resume(): devices are woken up so that we can write image to swap - - write image to swap - - suspend(PMSG_SUSPEND): suspend devices so that we can power off - - turn the power off - - Resume part - ~~~~~~~~~~~ - (is actually pretty similar) - - running system, user asks for suspend-to-disk - - user processes are stopped (in common case there are none, but with resume-from-initrd, no one knows) - - read image from disk - - suspend(PMSG_FREEZE): devices are frozen so that they don't interfere - with image restoration - - image restoration: rewrite memory with image - - resume(): devices are woken up so that system can continue - - thaw all user processes - -Q: What is this 'Encrypt suspend image' for? - -A: First of all: it is not a replacement for dm-crypt encrypted swap. -It cannot protect your computer while it is suspended. Instead it does -protect from leaking sensitive data after resume from suspend. - -Think of the following: you suspend while an application is running -that keeps sensitive data in memory. The application itself prevents -the data from being swapped out. Suspend, however, must write these -data to swap to be able to resume later on. Without suspend encryption -your sensitive data are then stored in plaintext on disk. This means -that after resume your sensitive data are accessible to all -applications having direct access to the swap device which was used -for suspend. If you don't need swap after resume these data can remain -on disk virtually forever. Thus it can happen that your system gets -broken in weeks later and sensitive data which you thought were -encrypted and protected are retrieved and stolen from the swap device. -To prevent this situation you should use 'Encrypt suspend image'. - -During suspend a temporary key is created and this key is used to -encrypt the data written to disk. When, during resume, the data was -read back into memory the temporary key is destroyed which simply -means that all data written to disk during suspend are then -inaccessible so they can't be stolen later on. The only thing that -you must then take care of is that you call 'mkswap' for the swap -partition used for suspend as early as possible during regular -boot. This asserts that any temporary key from an oopsed suspend or -from a failed or aborted resume is erased from the swap device. - -As a rule of thumb use encrypted swap to protect your data while your -system is shut down or suspended. Additionally use the encrypted -suspend image to prevent sensitive data from being stolen after -resume. - -Q: Can I suspend to a swap file? - -A: Generally, yes, you can. However, it requires you to use the "resume=" and -"resume_offset=" kernel command line parameters, so the resume from a swap file -cannot be initiated from an initrd or initramfs image. See -swsusp-and-swap-files.txt for details. - -Q: Is there a maximum system RAM size that is supported by swsusp? - -A: It should work okay with highmem. - -Q: Does swsusp (to disk) use only one swap partition or can it use -multiple swap partitions (aggregate them into one logical space)? - -A: Only one swap partition, sorry. - -Q: If my application(s) causes lots of memory & swap space to be used -(over half of the total system RAM), is it correct that it is likely -to be useless to try to suspend to disk while that app is running? - -A: No, it should work okay, as long as your app does not mlock() -it. Just prepare big enough swap partition. - -Q: What information is useful for debugging suspend-to-disk problems? - -A: Well, last messages on the screen are always useful. If something -is broken, it is usually some kernel driver, therefore trying with as -little as possible modules loaded helps a lot. I also prefer people to -suspend from console, preferably without X running. Booting with -init=/bin/bash, then swapon and starting suspend sequence manually -usually does the trick. Then it is good idea to try with latest -vanilla kernel. - -Q: How can distributions ship a swsusp-supporting kernel with modular -disk drivers (especially SATA)? - -A: Well, it can be done, load the drivers, then do echo into -/sys/power/resume file from initrd. Be sure not to mount -anything, not even read-only mount, or you are going to lose your -data. - -Q: How do I make suspend more verbose? - -A: If you want to see any non-error kernel messages on the virtual -terminal the kernel switches to during suspend, you have to set the -kernel console loglevel to at least 4 (KERN_WARNING), for example by -doing - - # save the old loglevel - read LOGLEVEL DUMMY < /proc/sys/kernel/printk - # set the loglevel so we see the progress bar. - # if the level is higher than needed, we leave it alone. - if [ $LOGLEVEL -lt 5 ]; then - echo 5 > /proc/sys/kernel/printk - fi - - IMG_SZ=0 - read IMG_SZ < /sys/power/image_size - echo -n disk > /sys/power/state - RET=$? - # - # the logic here is: - # if image_size > 0 (without kernel support, IMG_SZ will be zero), - # then try again with image_size set to zero. - if [ $RET -ne 0 -a $IMG_SZ -ne 0 ]; then # try again with minimal image size - echo 0 > /sys/power/image_size - echo -n disk > /sys/power/state - RET=$? - fi - - # restore previous loglevel - echo $LOGLEVEL > /proc/sys/kernel/printk - exit $RET - -Q: Is this true that if I have a mounted filesystem on a USB device and -I suspend to disk, I can lose data unless the filesystem has been mounted -with "sync"? - -A: That's right ... if you disconnect that device, you may lose data. -In fact, even with "-o sync" you can lose data if your programs have -information in buffers they haven't written out to a disk you disconnect, -or if you disconnect before the device finished saving data you wrote. - -Software suspend normally powers down USB controllers, which is equivalent -to disconnecting all USB devices attached to your system. - -Your system might well support low-power modes for its USB controllers -while the system is asleep, maintaining the connection, using true sleep -modes like "suspend-to-RAM" or "standby". (Don't write "disk" to the -/sys/power/state file; write "standby" or "mem".) We've not seen any -hardware that can use these modes through software suspend, although in -theory some systems might support "platform" modes that won't break the -USB connections. - -Remember that it's always a bad idea to unplug a disk drive containing a -mounted filesystem. That's true even when your system is asleep! The -safest thing is to unmount all filesystems on removable media (such USB, -Firewire, CompactFlash, MMC, external SATA, or even IDE hotplug bays) -before suspending; then remount them after resuming. - -There is a work-around for this problem. For more information, see -Documentation/driver-api/usb/persist.rst. - -Q: Can I suspend-to-disk using a swap partition under LVM? - -A: Yes and No. You can suspend successfully, but the kernel will not be able -to resume on its own. You need an initramfs that can recognize the resume -situation, activate the logical volume containing the swap volume (but not -touch any filesystems!), and eventually call - -echo -n "$major:$minor" > /sys/power/resume - -where $major and $minor are the respective major and minor device numbers of -the swap volume. - -uswsusp works with LVM, too. See http://suspend.sourceforge.net/ - -Q: I upgraded the kernel from 2.6.15 to 2.6.16. Both kernels were -compiled with the similar configuration files. Anyway I found that -suspend to disk (and resume) is much slower on 2.6.16 compared to -2.6.15. Any idea for why that might happen or how can I speed it up? - -A: This is because the size of the suspend image is now greater than -for 2.6.15 (by saving more data we can get more responsive system -after resume). - -There's the /sys/power/image_size knob that controls the size of the -image. If you set it to 0 (eg. by echo 0 > /sys/power/image_size as -root), the 2.6.15 behavior should be restored. If it is still too -slow, take a look at suspend.sf.net -- userland suspend is faster and -supports LZF compression to speed it up further. diff --git a/Documentation/power/tricks.txt b/Documentation/power/tricks.rst index a1b8f7249f4c..ca787f142c3f 100644 --- a/Documentation/power/tricks.txt +++ b/Documentation/power/tricks.rst @@ -1,5 +1,7 @@ - swsusp/S3 tricks - ~~~~~~~~~~~~~~~~ +================ +swsusp/S3 tricks +================ + Pavel Machek <pavel@ucw.cz> If you want to trick swsusp/S3 into working, you might want to try: diff --git a/Documentation/power/userland-swsusp.txt b/Documentation/power/userland-swsusp.rst index bbfcd1bbedc5..a0fa51bb1a4d 100644 --- a/Documentation/power/userland-swsusp.txt +++ b/Documentation/power/userland-swsusp.rst @@ -1,4 +1,7 @@ +===================================================== Documentation for userland software suspend interface +===================================================== + (C) 2006 Rafael J. Wysocki <rjw@sisk.pl> First, the warnings at the beginning of swsusp.txt still apply. @@ -30,13 +33,16 @@ called. The ioctl() commands recognized by the device are: -SNAPSHOT_FREEZE - freeze user space processes (the current process is +SNAPSHOT_FREEZE + freeze user space processes (the current process is not frozen); this is required for SNAPSHOT_CREATE_IMAGE and SNAPSHOT_ATOMIC_RESTORE to succeed -SNAPSHOT_UNFREEZE - thaw user space processes frozen by SNAPSHOT_FREEZE +SNAPSHOT_UNFREEZE + thaw user space processes frozen by SNAPSHOT_FREEZE -SNAPSHOT_CREATE_IMAGE - create a snapshot of the system memory; the +SNAPSHOT_CREATE_IMAGE + create a snapshot of the system memory; the last argument of ioctl() should be a pointer to an int variable, the value of which will indicate whether the call returned after creating the snapshot (1) or after restoring the system memory state @@ -45,48 +51,59 @@ SNAPSHOT_CREATE_IMAGE - create a snapshot of the system memory; the has been created the read() operation can be used to transfer it out of the kernel -SNAPSHOT_ATOMIC_RESTORE - restore the system memory state from the +SNAPSHOT_ATOMIC_RESTORE + restore the system memory state from the uploaded snapshot image; before calling it you should transfer the system memory snapshot back to the kernel using the write() operation; this call will not succeed if the snapshot image is not available to the kernel -SNAPSHOT_FREE - free memory allocated for the snapshot image +SNAPSHOT_FREE + free memory allocated for the snapshot image -SNAPSHOT_PREF_IMAGE_SIZE - set the preferred maximum size of the image +SNAPSHOT_PREF_IMAGE_SIZE + set the preferred maximum size of the image (the kernel will do its best to ensure the image size will not exceed this number, but if it turns out to be impossible, the kernel will create the smallest image possible) -SNAPSHOT_GET_IMAGE_SIZE - return the actual size of the hibernation image +SNAPSHOT_GET_IMAGE_SIZE + return the actual size of the hibernation image -SNAPSHOT_AVAIL_SWAP_SIZE - return the amount of available swap in bytes (the +SNAPSHOT_AVAIL_SWAP_SIZE + return the amount of available swap in bytes (the last argument should be a pointer to an unsigned int variable that will contain the result if the call is successful). -SNAPSHOT_ALLOC_SWAP_PAGE - allocate a swap page from the resume partition +SNAPSHOT_ALLOC_SWAP_PAGE + allocate a swap page from the resume partition (the last argument should be a pointer to a loff_t variable that will contain the swap page offset if the call is successful) -SNAPSHOT_FREE_SWAP_PAGES - free all swap pages allocated by +SNAPSHOT_FREE_SWAP_PAGES + free all swap pages allocated by SNAPSHOT_ALLOC_SWAP_PAGE -SNAPSHOT_SET_SWAP_AREA - set the resume partition and the offset (in <PAGE_SIZE> +SNAPSHOT_SET_SWAP_AREA + set the resume partition and the offset (in <PAGE_SIZE> units) from the beginning of the partition at which the swap header is located (the last ioctl() argument should point to a struct resume_swap_area, as defined in kernel/power/suspend_ioctls.h, containing the resume device specification and the offset); for swap partitions the offset is always 0, but it is different from zero for - swap files (see Documentation/power/swsusp-and-swap-files.txt for + swap files (see Documentation/power/swsusp-and-swap-files.rst for details). -SNAPSHOT_PLATFORM_SUPPORT - enable/disable the hibernation platform support, +SNAPSHOT_PLATFORM_SUPPORT + enable/disable the hibernation platform support, depending on the argument value (enable, if the argument is nonzero) -SNAPSHOT_POWER_OFF - make the kernel transition the system to the hibernation +SNAPSHOT_POWER_OFF + make the kernel transition the system to the hibernation state (eg. ACPI S4) using the platform (eg. ACPI) driver -SNAPSHOT_S2RAM - suspend to RAM; using this call causes the kernel to +SNAPSHOT_S2RAM + suspend to RAM; using this call causes the kernel to immediately enter the suspend-to-RAM state, so this call must always be preceded by the SNAPSHOT_FREEZE call and it is also necessary to use the SNAPSHOT_UNFREEZE call after the system wakes up. This call @@ -98,10 +115,11 @@ SNAPSHOT_S2RAM - suspend to RAM; using this call causes the kernel to The device's read() operation can be used to transfer the snapshot image from the kernel. It has the following limitations: + - you cannot read() more than one virtual memory page at a time - read()s across page boundaries are impossible (ie. if you read() 1/2 of - a page in the previous call, you will only be able to read() - _at_ _most_ 1/2 of the page in the next call) + a page in the previous call, you will only be able to read() + **at most** 1/2 of the page in the next call) The device's write() operation is used for uploading the system memory snapshot into the kernel. It has the same limitations as the read() operation. @@ -143,8 +161,10 @@ preferably using mlockall(), before calling SNAPSHOT_FREEZE. The suspending utility MUST check the value stored by SNAPSHOT_CREATE_IMAGE in the memory location pointed to by the last argument of ioctl() and proceed in accordance with it: + 1. If the value is 1 (ie. the system memory snapshot has just been created and the system is ready for saving it): + (a) The suspending utility MUST NOT close the snapshot device _unless_ the whole suspend procedure is to be cancelled, in which case, if the snapshot image has already been saved, the @@ -158,6 +178,7 @@ in accordance with it: called. However, it MAY mount a file system that was not mounted at that time and perform some operations on it (eg. use it for saving the image). + 2. If the value is 0 (ie. the system state has just been restored from the snapshot image), the suspending utility MUST close the snapshot device. Afterwards it will be treated as a regular userland process, diff --git a/Documentation/power/video.txt b/Documentation/power/video.rst index 3e6272bc4472..337a2ba9f32f 100644 --- a/Documentation/power/video.txt +++ b/Documentation/power/video.rst @@ -1,7 +1,8 @@ +=========================== +Video issues with S3 resume +=========================== - Video issues with S3 resume - ~~~~~~~~~~~~~~~~~~~~~~~~~~~ - 2003-2006, Pavel Machek +2003-2006, Pavel Machek During S3 resume, hardware needs to be reinitialized. For most devices, this is easy, and kernel driver knows how to do @@ -41,37 +42,37 @@ There are a few types of systems where video works after S3 resume: (1) systems where video state is preserved over S3. (2) systems where it is possible to call the video BIOS during S3 - resume. Unfortunately, it is not correct to call the video BIOS at - that point, but it happens to work on some machines. Use - acpi_sleep=s3_bios. + resume. Unfortunately, it is not correct to call the video BIOS at + that point, but it happens to work on some machines. Use + acpi_sleep=s3_bios. (3) systems that initialize video card into vga text mode and where - the BIOS works well enough to be able to set video mode. Use - acpi_sleep=s3_mode on these. + the BIOS works well enough to be able to set video mode. Use + acpi_sleep=s3_mode on these. (4) on some systems s3_bios kicks video into text mode, and - acpi_sleep=s3_bios,s3_mode is needed. + acpi_sleep=s3_bios,s3_mode is needed. (5) radeon systems, where X can soft-boot your video card. You'll need - a new enough X, and a plain text console (no vesafb or radeonfb). See - http://www.doesi.gmxhome.de/linux/tm800s3/s3.html for more information. - Alternatively, you should use vbetool (6) instead. + a new enough X, and a plain text console (no vesafb or radeonfb). See + http://www.doesi.gmxhome.de/linux/tm800s3/s3.html for more information. + Alternatively, you should use vbetool (6) instead. (6) other radeon systems, where vbetool is enough to bring system back - to life. It needs text console to be working. Do vbetool vbestate - save > /tmp/delme; echo 3 > /proc/acpi/sleep; vbetool post; vbetool - vbestate restore < /tmp/delme; setfont <whatever>, and your video - should work. + to life. It needs text console to be working. Do vbetool vbestate + save > /tmp/delme; echo 3 > /proc/acpi/sleep; vbetool post; vbetool + vbestate restore < /tmp/delme; setfont <whatever>, and your video + should work. (7) on some systems, it is possible to boot most of kernel, and then - POSTing bios works. Ole Rohne has patch to do just that at - http://dev.gentoo.org/~marineam/patch-radeonfb-2.6.11-rc2-mm2. + POSTing bios works. Ole Rohne has patch to do just that at + http://dev.gentoo.org/~marineam/patch-radeonfb-2.6.11-rc2-mm2. -(8) on some systems, you can use the video_post utility and or - do echo 3 > /sys/power/state && /usr/sbin/video_post - which will - initialize the display in console mode. If you are in X, you can switch - to a virtual terminal and back to X using CTRL+ALT+F1 - CTRL+ALT+F7 to get - the display working in graphical mode again. +(8) on some systems, you can use the video_post utility and or + do echo 3 > /sys/power/state && /usr/sbin/video_post - which will + initialize the display in console mode. If you are in X, you can switch + to a virtual terminal and back to X using CTRL+ALT+F1 - CTRL+ALT+F7 to get + the display working in graphical mode again. Now, if you pass acpi_sleep=something, and it does not work with your bios, you'll get a hard crash during resume. Be careful. Also it is @@ -87,99 +88,126 @@ chance of working. Table of known working notebooks: + +=============================== =============================================== Model hack (or "how to do it") ------------------------------------------------------------------------------- +=============================== =============================================== Acer Aspire 1406LC ole's late BIOS init (7), turn off DRI Acer TM 230 s3_bios (2) Acer TM 242FX vbetool (6) Acer TM C110 video_post (8) -Acer TM C300 vga=normal (only suspend on console, not in X), vbetool (6) or video_post (8) +Acer TM C300 vga=normal (only suspend on console, not in X), + vbetool (6) or video_post (8) Acer TM 4052LCi s3_bios (2) Acer TM 636Lci s3_bios,s3_mode (4) -Acer TM 650 (Radeon M7) vga=normal plus boot-radeon (5) gets text console back -Acer TM 660 ??? (*) -Acer TM 800 vga=normal, X patches, see webpage (5) or vbetool (6) -Acer TM 803 vga=normal, X patches, see webpage (5) or vbetool (6) +Acer TM 650 (Radeon M7) vga=normal plus boot-radeon (5) gets text + console back +Acer TM 660 ??? [#f1]_ +Acer TM 800 vga=normal, X patches, see webpage (5) + or vbetool (6) +Acer TM 803 vga=normal, X patches, see webpage (5) + or vbetool (6) Acer TM 803LCi vga=normal, vbetool (6) Arima W730a vbetool needed (6) -Asus L2400D s3_mode (3)(***) (S1 also works OK) +Asus L2400D s3_mode (3) [#f2]_ (S1 also works OK) Asus L3350M (SiS 740) (6) Asus L3800C (Radeon M7) s3_bios (2) (S1 also works OK) -Asus M6887Ne vga=normal, s3_bios (2), use radeon driver instead of fglrx in x.org +Asus M6887Ne vga=normal, s3_bios (2), use radeon driver + instead of fglrx in x.org Athlon64 desktop prototype s3_bios (2) -Compal CL-50 ??? (*) +Compal CL-50 ??? [#f1]_ Compaq Armada E500 - P3-700 none (1) (S1 also works OK) Compaq Evo N620c vga=normal, s3_bios (2) Dell 600m, ATI R250 Lf none (1), but needs xorg-x11-6.8.1.902-1 Dell D600, ATI RV250 vga=normal and X, or try vbestate (6) -Dell D610 vga=normal and X (possibly vbestate (6) too, but not tested) -Dell Inspiron 4000 ??? (*) -Dell Inspiron 500m ??? (*) +Dell D610 vga=normal and X (possibly vbestate (6) too, + but not tested) +Dell Inspiron 4000 ??? [#f1]_ +Dell Inspiron 500m ??? [#f1]_ Dell Inspiron 510m ??? Dell Inspiron 5150 vbetool needed (6) -Dell Inspiron 600m ??? (*) -Dell Inspiron 8200 ??? (*) -Dell Inspiron 8500 ??? (*) -Dell Inspiron 8600 ??? (*) -eMachines athlon64 machines vbetool needed (6) (someone please get me model #s) -HP NC6000 s3_bios, may not use radeonfb (2); or vbetool (6) -HP NX7000 ??? (*) -HP Pavilion ZD7000 vbetool post needed, need open-source nv driver for X +Dell Inspiron 600m ??? [#f1]_ +Dell Inspiron 8200 ??? [#f1]_ +Dell Inspiron 8500 ??? [#f1]_ +Dell Inspiron 8600 ??? [#f1]_ +eMachines athlon64 machines vbetool needed (6) (someone please get + me model #s) +HP NC6000 s3_bios, may not use radeonfb (2); + or vbetool (6) +HP NX7000 ??? [#f1]_ +HP Pavilion ZD7000 vbetool post needed, need open-source nv + driver for X HP Omnibook XE3 athlon version none (1) HP Omnibook XE3GC none (1), video is S3 Savage/IX-MV HP Omnibook XE3L-GF vbetool (6) HP Omnibook 5150 none (1), (S1 also works OK) -IBM TP T20, model 2647-44G none (1), video is S3 Inc. 86C270-294 Savage/IX-MV, vesafb gets "interesting" but X work. -IBM TP A31 / Type 2652-M5G s3_mode (3) [works ok with BIOS 1.04 2002-08-23, but not at all with BIOS 1.11 2004-11-05 :-(] +IBM TP T20, model 2647-44G none (1), video is S3 Inc. 86C270-294 + Savage/IX-MV, vesafb gets "interesting" + but X work. +IBM TP A31 / Type 2652-M5G s3_mode (3) [works ok with + BIOS 1.04 2002-08-23, but not at all with + BIOS 1.11 2004-11-05 :-(] IBM TP R32 / Type 2658-MMG none (1) -IBM TP R40 2722B3G ??? (*) +IBM TP R40 2722B3G ??? [#f1]_ IBM TP R50p / Type 1832-22U s3_bios (2) IBM TP R51 none (1) -IBM TP T30 236681A ??? (*) +IBM TP T30 236681A ??? [#f1]_ IBM TP T40 / Type 2373-MU4 none (1) IBM TP T40p none (1) IBM TP R40p s3_bios (2) IBM TP T41p s3_bios (2), switch to X after resume IBM TP T42 s3_bios (2) IBM ThinkPad T42p (2373-GTG) s3_bios (2) -IBM TP X20 ??? (*) +IBM TP X20 ??? [#f1]_ IBM TP X30 s3_bios, s3_mode (4) -IBM TP X31 / Type 2672-XXH none (1), use radeontool (http://fdd.com/software/radeon/) to turn off backlight. -IBM TP X32 none (1), but backlight is on and video is trashed after long suspend. s3_bios,s3_mode (4) works too. Perhaps that gets better results? +IBM TP X31 / Type 2672-XXH none (1), use radeontool + (http://fdd.com/software/radeon/) to + turn off backlight. +IBM TP X32 none (1), but backlight is on and video is + trashed after long suspend. s3_bios, + s3_mode (4) works too. Perhaps that gets + better results? IBM Thinkpad X40 Type 2371-7JG s3_bios,s3_mode (4) -IBM TP 600e none(1), but a switch to console and back to X is needed -Medion MD4220 ??? (*) +IBM TP 600e none(1), but a switch to console and + back to X is needed +Medion MD4220 ??? [#f1]_ Samsung P35 vbetool needed (6) Sharp PC-AR10 (ATI rage) none (1), backlight does not switch off Sony Vaio PCG-C1VRX/K s3_bios (2) -Sony Vaio PCG-F403 ??? (*) +Sony Vaio PCG-F403 ??? [#f1]_ Sony Vaio PCG-GRT995MP none (1), works with 'nv' X driver -Sony Vaio PCG-GR7/K none (1), but needs radeonfb, use radeontool (http://fdd.com/software/radeon/) to turn off backlight. -Sony Vaio PCG-N505SN ??? (*) +Sony Vaio PCG-GR7/K none (1), but needs radeonfb, use + radeontool (http://fdd.com/software/radeon/) + to turn off backlight. +Sony Vaio PCG-N505SN ??? [#f1]_ Sony Vaio vgn-s260 X or boot-radeon can init it (5) -Sony Vaio vgn-S580BH vga=normal, but suspend from X. Console will be blank unless you return to X. +Sony Vaio vgn-S580BH vga=normal, but suspend from X. Console will + be blank unless you return to X. Sony Vaio vgn-FS115B s3_bios (2),s3_mode (4) Toshiba Libretto L5 none (1) Toshiba Libretto 100CT/110CT vbetool (6) Toshiba Portege 3020CT s3_mode (3) Toshiba Satellite 4030CDT s3_mode (3) (S1 also works OK) Toshiba Satellite 4080XCDT s3_mode (3) (S1 also works OK) -Toshiba Satellite 4090XCDT ??? (*) -Toshiba Satellite P10-554 s3_bios,s3_mode (4)(****) +Toshiba Satellite 4090XCDT ??? [#f1]_ +Toshiba Satellite P10-554 s3_bios,s3_mode (4)[#f3]_ Toshiba M30 (2) xor X with nvidia driver using internal AGP -Uniwill 244IIO ??? (*) +Uniwill 244IIO ??? [#f1]_ +=============================== =============================================== Known working desktop systems ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ +=================== ============================= ======================== Mainboard Graphics card hack (or "how to do it") ------------------------------------------------------------------------------- +=================== ============================= ======================== Asus A7V8X nVidia RIVA TNT2 model 64 s3_bios,s3_mode (4) +=================== ============================= ======================== -(*) from https://wiki.ubuntu.com/HoaryPMResults, not sure - which options to use. If you know, please tell me. +.. [#f1] from https://wiki.ubuntu.com/HoaryPMResults, not sure + which options to use. If you know, please tell me. -(***) To be tested with a newer kernel. +.. [#f2] To be tested with a newer kernel. -(****) Not with SMP kernel, UP only. +.. [#f3] Not with SMP kernel, UP only. diff --git a/Documentation/process/submitting-drivers.rst b/Documentation/process/submitting-drivers.rst index 58bc047e7b95..1acaa14903d6 100644 --- a/Documentation/process/submitting-drivers.rst +++ b/Documentation/process/submitting-drivers.rst @@ -117,7 +117,7 @@ PM support: implemented") error. You should also try to make sure that your driver uses as little power as possible when it's not doing anything. For the driver testing instructions see - Documentation/power/drivers-testing.txt and for a relatively + Documentation/power/drivers-testing.rst and for a relatively complete overview of the power management issues related to drivers see :ref:`Documentation/driver-api/pm/devices.rst <driverapi_pm_devices>`. diff --git a/Documentation/scheduler/sched-energy.rst b/Documentation/scheduler/sched-energy.rst index fce5858c9082..9580c57a52bc 100644 --- a/Documentation/scheduler/sched-energy.rst +++ b/Documentation/scheduler/sched-energy.rst @@ -22,7 +22,7 @@ the highest. The actual EM used by EAS is _not_ maintained by the scheduler, but by a dedicated framework. For details about this framework and what it provides, -please refer to its documentation (see Documentation/power/energy-model.txt). +please refer to its documentation (see Documentation/power/energy-model.rst). 2. Background and Terminology @@ -81,7 +81,7 @@ through the arch_scale_cpu_capacity() callback. The rest of platform knowledge used by EAS is directly read from the Energy Model (EM) framework. The EM of a platform is composed of a power cost table -per 'performance domain' in the system (see Documentation/power/energy-model.txt +per 'performance domain' in the system (see Documentation/power/energy-model.rst for futher details about performance domains). The scheduler manages references to the EM objects in the topology code when the @@ -353,7 +353,7 @@ could be amended in the future if proven otherwise. EAS uses the EM of a platform to estimate the impact of scheduling decisions on energy. So, your platform must provide power cost tables to the EM framework in order to make EAS start. To do so, please refer to documentation of the -independent EM framework in Documentation/power/energy-model.txt. +independent EM framework in Documentation/power/energy-model.rst. Please also note that the scheduling domains need to be re-built after the EM has been registered in order to start EAS. diff --git a/Documentation/trace/coresight-cpu-debug.txt b/Documentation/trace/coresight-cpu-debug.txt index f07e38094b40..1a660a39e3c0 100644 --- a/Documentation/trace/coresight-cpu-debug.txt +++ b/Documentation/trace/coresight-cpu-debug.txt @@ -151,7 +151,7 @@ At the runtime you can disable idle states with below methods: It is possible to disable CPU idle states by way of the PM QoS subsystem, more specifically by using the "/dev/cpu_dma_latency" -interface (see Documentation/power/pm_qos_interface.txt for more +interface (see Documentation/power/pm_qos_interface.rst for more details). As specified in the PM QoS documentation the requested parameter will stay in effect until the file descriptor is released. For example: diff --git a/Documentation/translations/zh_CN/process/submitting-drivers.rst b/Documentation/translations/zh_CN/process/submitting-drivers.rst index 72f4f45c98de..d99885c27aed 100644 --- a/Documentation/translations/zh_CN/process/submitting-drivers.rst +++ b/Documentation/translations/zh_CN/process/submitting-drivers.rst @@ -97,7 +97,7 @@ Linux 2.6: 函数定义成返回 -ENOSYS（功能未实现）错误。你还应该尝试确 保你的驱动在什么都不干的情况下将耗电降到最低。要获得驱动 程序测试的指导，请参阅 - Documentation/power/drivers-testing.txt。有关驱动程序电 + Documentation/power/drivers-testing.rst。有关驱动程序电 源管理问题相对全面的概述，请参阅 Documentation/driver-api/pm/devices.rst。 diff --git a/MAINTAINERS b/MAINTAINERS index 350bb27a1c25..91eed595dc9a 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -6548,7 +6548,7 @@ M: "Rafael J. Wysocki" <rjw@rjwysocki.net> M: Pavel Machek <pavel@ucw.cz> L: linux-pm@vger.kernel.org S: Supported -F: Documentation/power/freezing-of-tasks.txt +F: Documentation/power/freezing-of-tasks.rst F: include/linux/freezer.h F: kernel/freezer.c @@ -11942,7 +11942,7 @@ S: Maintained T: git git://git.kernel.org/pub/scm/linux/kernel/git/vireshk/pm.git F: drivers/opp/ F: include/linux/pm_opp.h -F: Documentation/power/opp.txt +F: Documentation/power/opp.rst F: Documentation/devicetree/bindings/opp/ OPL4 DRIVER @@ -12329,7 +12329,7 @@ M: Sam Bobroff <sbobroff@linux.ibm.com> M: Oliver O'Halloran <oohall@gmail.com> L: linuxppc-dev@lists.ozlabs.org S: Supported -F: Documentation/PCI/pci-error-recovery.txt +F: Documentation/PCI/pci-error-recovery.rst F: drivers/pci/pcie/aer.c F: drivers/pci/pcie/dpc.c F: drivers/pci/pcie/err.c @@ -12342,7 +12342,7 @@ PCI ERROR RECOVERY M: Linas Vepstas <linasvepstas@gmail.com> L: linux-pci@vger.kernel.org S: Supported -F: Documentation/PCI/pci-error-recovery.txt +F: Documentation/PCI/pci-error-recovery.rst PCI MSI DRIVER FOR ALTERA MSI IP M: Ley Foon Tan <lftan@altera.com> diff --git a/arch/arm64/kernel/pci.c b/arch/arm64/kernel/pci.c index 575bd5517d21..570988c7a7ff 100644 --- a/arch/arm64/kernel/pci.c +++ b/arch/arm64/kernel/pci.c @@ -164,6 +164,7 @@ struct pci_bus *pci_acpi_scan_root(struct acpi_pci_root *root) struct acpi_pci_generic_root_info *ri; struct pci_bus *bus, *child; struct acpi_pci_root_ops *root_ops; + struct pci_host_bridge *host; ri = kzalloc(sizeof(*ri), GFP_KERNEL); if (!ri) @@ -189,8 +190,16 @@ struct pci_bus *pci_acpi_scan_root(struct acpi_pci_root *root) if (!bus) return NULL; - pci_bus_size_bridges(bus); - pci_bus_assign_resources(bus); + /* If we must preserve the resource configuration, claim now */ + host = pci_find_host_bridge(bus); + if (host->preserve_config) + pci_bus_claim_resources(bus); + + /* + * Assign whatever was left unassigned. If we didn't claim above, + * this will reassign everything. + */ + pci_assign_unassigned_root_bus_resources(bus); list_for_each_entry(child, &bus->children, node) pcie_bus_configure_settings(child); diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index d0bbca65e4a4..879741336771 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -2482,7 +2482,7 @@ menuconfig APM machines with more than one CPU. In order to use APM, you will need supporting software. For location - and more information, read <file:Documentation/power/apm-acpi.txt> + and more information, read <file:Documentation/power/apm-acpi.rst> and the Battery Powered Linux mini-HOWTO, available from <http://www.tldp.org/docs.html#howto>. diff --git a/drivers/acpi/pci_root.c b/drivers/acpi/pci_root.c index 39f5d172e84f..314a187ed572 100644 --- a/drivers/acpi/pci_root.c +++ b/drivers/acpi/pci_root.c @@ -881,6 +881,7 @@ struct pci_bus *acpi_pci_root_create(struct acpi_pci_root *root, int node = acpi_get_node(device->handle); struct pci_bus *bus; struct pci_host_bridge *host_bridge; + union acpi_object *obj; info->root = root; info->bridge = device; @@ -917,6 +918,17 @@ struct pci_bus *acpi_pci_root_create(struct acpi_pci_root *root, if (!(root->osc_control_set & OSC_PCI_EXPRESS_LTR_CONTROL)) host_bridge->native_ltr = 0; + /* + * Evaluate the "PCI Boot Configuration" _DSM Function. If it + * exists and returns 0, we must preserve any PCI resource + * assignments made by firmware for this host bridge. + */ + obj = acpi_evaluate_dsm(ACPI_HANDLE(bus->bridge), &pci_acpi_dsm_guid, 1, + IGNORE_PCI_BOOT_CONFIG_DSM, NULL); + if (obj && obj->type == ACPI_TYPE_INTEGER && obj->integer.value == 0) + host_bridge->preserve_config = 1; + ACPI_FREE(obj); + pci_scan_child_bus(bus); pci_set_host_bridge_release(host_bridge, acpi_pci_root_release_info, info); diff --git a/drivers/gpu/drm/i915/intel_runtime_pm.h b/drivers/gpu/drm/i915/intel_runtime_pm.h index 473c4850c01d..2ee8f9522e05 100644 --- a/drivers/gpu/drm/i915/intel_runtime_pm.h +++ b/drivers/gpu/drm/i915/intel_runtime_pm.h @@ -45,7 +45,7 @@ enum i915_drm_suspend_mode { * to be disabled. This shouldn't happen and we'll print some error messages in * case it happens. * - * For more, read the Documentation/power/runtime_pm.txt. + * For more, read the Documentation/power/runtime_pm.rst. */ struct intel_runtime_pm { atomic_t wakeref_count; diff --git a/drivers/opp/Kconfig b/drivers/opp/Kconfig index fe54d349d2e1..35dfc7e80f92 100644 --- a/drivers/opp/Kconfig +++ b/drivers/opp/Kconfig @@ -11,4 +11,4 @@ config PM_OPP OPP layer organizes the data internally using device pointers representing individual voltage domains and provides SOC implementations a ready to use framework to manage OPPs. - For more information, read <file:Documentation/power/opp.txt> + For more information, read <file:Documentation/power/opp.rst> diff --git a/drivers/pci/ats.c b/drivers/pci/ats.c index 97c08146534a..e18499243f84 100644 --- a/drivers/pci/ats.c +++ b/drivers/pci/ats.c @@ -432,7 +432,7 @@ EXPORT_SYMBOL_GPL(pci_prg_resp_pasid_required); * @pdev: PCI device structure * * Returns negative value when PASID capability is not present. - * Otherwise it returns the numer of supported PASIDs. + * Otherwise it returns the number of supported PASIDs. */ int pci_max_pasids(struct pci_dev *pdev) { diff --git a/drivers/pci/controller/Kconfig b/drivers/pci/controller/Kconfig index 011c57cae4b0..fe9f9f13ce11 100644 --- a/drivers/pci/controller/Kconfig +++ b/drivers/pci/controller/Kconfig @@ -174,14 +174,14 @@ config PCIE_IPROC_MSI PCIe controller config PCIE_ALTERA - bool "Altera PCIe controller" + tristate "Altera PCIe controller" depends on ARM || NIOS2 || ARM64 || COMPILE_TEST help Say Y here if you want to enable PCIe controller support on Altera FPGA. config PCIE_ALTERA_MSI - bool "Altera PCIe MSI feature" + tristate "Altera PCIe MSI feature" depends on PCIE_ALTERA depends on PCI_MSI_IRQ_DOMAIN help diff --git a/drivers/pci/controller/dwc/Kconfig b/drivers/pci/controller/dwc/Kconfig index a6ce1ee51b4c..6ea778ae4877 100644 --- a/drivers/pci/controller/dwc/Kconfig +++ b/drivers/pci/controller/dwc/Kconfig @@ -90,7 +90,7 @@ config PCI_EXYNOS config PCI_IMX6 bool "Freescale i.MX6/7/8 PCIe controller" - depends on SOC_IMX6Q || SOC_IMX7D || (ARM64 && ARCH_MXC) || COMPILE_TEST + depends on ARCH_MXC || COMPILE_TEST depends on PCI_MSI_IRQ_DOMAIN select PCIE_DW_HOST diff --git a/drivers/pci/controller/dwc/pci-dra7xx.c b/drivers/pci/controller/dwc/pci-dra7xx.c index 419451efd58c..4234ddb4722f 100644 --- a/drivers/pci/controller/dwc/pci-dra7xx.c +++ b/drivers/pci/controller/dwc/pci-dra7xx.c @@ -26,6 +26,7 @@ #include <linux/types.h> #include <linux/mfd/syscon.h> #include <linux/regmap.h> +#include <linux/gpio/consumer.h> #include "../../pci.h" #include "pcie-designware.h" diff --git a/drivers/pci/controller/dwc/pcie-armada8k.c b/drivers/pci/controller/dwc/pcie-armada8k.c index 0c389a30ef5d..3d55dc78d999 100644 --- a/drivers/pci/controller/dwc/pcie-armada8k.c +++ b/drivers/pci/controller/dwc/pcie-armada8k.c @@ -25,10 +25,14 @@ #include "pcie-designware.h" +#define ARMADA8K_PCIE_MAX_LANES PCIE_LNK_X4 + struct armada8k_pcie { struct dw_pcie *pci; struct clk *clk; struct clk *clk_reg; + struct phy *phy[ARMADA8K_PCIE_MAX_LANES]; + unsigned int phy_count; }; #define PCIE_VENDOR_REGS_OFFSET 0x8000 @@ -55,7 +59,7 @@ struct armada8k_pcie { #define PCIE_ARUSER_REG (PCIE_VENDOR_REGS_OFFSET + 0x5C) #define PCIE_AWUSER_REG (PCIE_VENDOR_REGS_OFFSET + 0x60) /* - * AR/AW Cache defauls: Normal memory, Write-Back, Read / Write + * AR/AW Cache defaults: Normal memory, Write-Back, Read / Write * allocate */ #define ARCACHE_DEFAULT_VALUE 0x3511 @@ -67,6 +71,76 @@ struct armada8k_pcie { #define to_armada8k_pcie(x) dev_get_drvdata((x)->dev) +static void armada8k_pcie_disable_phys(struct armada8k_pcie *pcie) +{ + int i; + + for (i = 0; i < ARMADA8K_PCIE_MAX_LANES; i++) { + phy_power_off(pcie->phy[i]); + phy_exit(pcie->phy[i]); + } +} + +static int armada8k_pcie_enable_phys(struct armada8k_pcie *pcie) +{ + int ret; + int i; + + for (i = 0; i < ARMADA8K_PCIE_MAX_LANES; i++) { + ret = phy_init(pcie->phy[i]); + if (ret) + return ret; + + ret = phy_set_mode_ext(pcie->phy[i], PHY_MODE_PCIE, + pcie->phy_count); + if (ret) { + phy_exit(pcie->phy[i]); + return ret; + } + + ret = phy_power_on(pcie->phy[i]); + if (ret) { + phy_exit(pcie->phy[i]); + return ret; + } + } + + return 0; +} + +static int armada8k_pcie_setup_phys(struct armada8k_pcie *pcie) +{ + struct dw_pcie *pci = pcie->pci; + struct device *dev = pci->dev; + struct device_node *node = dev->of_node; + int ret = 0; + int i; + + for (i = 0; i < ARMADA8K_PCIE_MAX_LANES; i++) { + pcie->phy[i] = devm_of_phy_get_by_index(dev, node, i); + if (IS_ERR(pcie->phy[i]) && + (PTR_ERR(pcie->phy[i]) == -EPROBE_DEFER)) + return PTR_ERR(pcie->phy[i]); + + if (IS_ERR(pcie->phy[i])) { + pcie->phy[i] = NULL; + continue; + } + + pcie->phy_count++; + } + + /* Old bindings miss the PHY handle, so just warn if there is no PHY */ + if (!pcie->phy_count) + dev_warn(dev, "No available PHY\n"); + + ret = armada8k_pcie_enable_phys(pcie); + if (ret) + dev_err(dev, "Failed to initialize PHY(s) (%d)\n", ret); + + return ret; +} + static int armada8k_pcie_link_up(struct dw_pcie *pci) { u32 reg; @@ -249,14 +323,20 @@ static int armada8k_pcie_probe(struct platform_device *pdev) goto fail_clkreg; } + ret = armada8k_pcie_setup_phys(pcie); + if (ret) + goto fail_clkreg; + platform_set_drvdata(pdev, pcie); ret = armada8k_add_pcie_port(pcie, pdev); if (ret) - goto fail_clkreg; + goto disable_phy; return 0; +disable_phy: + armada8k_pcie_disable_phys(pcie); fail_clkreg: clk_disable_unprepare(pcie->clk_reg); fail: diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c b/drivers/pci/controller/dwc/pcie-designware-host.c index 77db32529319..f93252d0da5b 100644 --- a/drivers/pci/controller/dwc/pcie-designware-host.c +++ b/drivers/pci/controller/dwc/pcie-designware-host.c @@ -311,6 +311,7 @@ void dw_pcie_msi_init(struct pcie_port *pp) dw_pcie_wr_own_conf(pp, PCIE_MSI_ADDR_HI, 4, upper_32_bits(msi_target)); } +EXPORT_SYMBOL_GPL(dw_pcie_msi_init); int dw_pcie_host_init(struct pcie_port *pp) { @@ -495,6 +496,16 @@ err_free_msi: dw_pcie_free_msi(pp); return ret; } +EXPORT_SYMBOL_GPL(dw_pcie_host_init); + +void dw_pcie_host_deinit(struct pcie_port *pp) +{ + pci_stop_root_bus(pp->root_bus); + pci_remove_root_bus(pp->root_bus); + if (pci_msi_enabled() && !pp->ops->msi_host_init) + dw_pcie_free_msi(pp); +} +EXPORT_SYMBOL_GPL(dw_pcie_host_deinit); static int dw_pcie_access_other_conf(struct pcie_port *pp, struct pci_bus *bus, u32 devfn, int where, int size, u32 *val, @@ -687,3 +698,4 @@ void dw_pcie_setup_rc(struct pcie_port *pp) val |= PORT_LOGIC_SPEED_CHANGE; dw_pcie_wr_own_conf(pp, PCIE_LINK_WIDTH_SPEED_CONTROL, 4, val); } +EXPORT_SYMBOL_GPL(dw_pcie_setup_rc); diff --git a/drivers/pci/controller/dwc/pcie-designware.c b/drivers/pci/controller/dwc/pcie-designware.c index 9d7c51c32b3b..7d25102c304c 100644 --- a/drivers/pci/controller/dwc/pcie-designware.c +++ b/drivers/pci/controller/dwc/pcie-designware.c @@ -34,6 +34,7 @@ int dw_pcie_read(void __iomem *addr, int size, u32 *val) return PCIBIOS_SUCCESSFUL; } +EXPORT_SYMBOL_GPL(dw_pcie_read); int dw_pcie_write(void __iomem *addr, int size, u32 val) { @@ -51,69 +52,97 @@ int dw_pcie_write(void __iomem *addr, int size, u32 val) return PCIBIOS_SUCCESSFUL; } +EXPORT_SYMBOL_GPL(dw_pcie_write); -u32 __dw_pcie_read_dbi(struct dw_pcie *pci, void __iomem *base, u32 reg, - size_t size) +u32 dw_pcie_read_dbi(struct dw_pcie *pci, u32 reg, size_t size) { int ret; u32 val; if (pci->ops->read_dbi) - return pci->ops->read_dbi(pci, base, reg, size); + return pci->ops->read_dbi(pci, pci->dbi_base, reg, size); - ret = dw_pcie_read(base + reg, size, &val); + ret = dw_pcie_read(pci->dbi_base + reg, size, &val); if (ret) dev_err(pci->dev, "Read DBI address failed\n"); return val; } +EXPORT_SYMBOL_GPL(dw_pcie_read_dbi); -void __dw_pcie_write_dbi(struct dw_pcie *pci, void __iomem *base, u32 reg, - size_t size, u32 val) +void dw_pcie_write_dbi(struct dw_pcie *pci, u32 reg, size_t size, u32 val) { int ret; if (pci->ops->write_dbi) { - pci->ops->write_dbi(pci, base, reg, size, val); + pci->ops->write_dbi(pci, pci->dbi_base, reg, size, val); return; } - ret = dw_pcie_write(base + reg, size, val); + ret = dw_pcie_write(pci->dbi_base + reg, size, val); if (ret) dev_err(pci->dev, "Write DBI address failed\n"); } +EXPORT_SYMBOL_GPL(dw_pcie_write_dbi); -u32 __dw_pcie_read_dbi2(struct dw_pcie *pci, void __iomem *base, u32 reg, - size_t size) +u32 dw_pcie_read_dbi2(struct dw_pcie *pci, u32 reg, size_t size) { int ret; u32 val; if (pci->ops->read_dbi2) - return pci->ops->read_dbi2(pci, base, reg, size); + return pci->ops->read_dbi2(pci, pci->dbi_base2, reg, size); - ret = dw_pcie_read(base + reg, size, &val); + ret = dw_pcie_read(pci->dbi_base2 + reg, size, &val); if (ret) dev_err(pci->dev, "read DBI address failed\n"); return val; } -void __dw_pcie_write_dbi2(struct dw_pcie *pci, void __iomem *base, u32 reg, - size_t size, u32 val) +void dw_pcie_write_dbi2(struct dw_pcie *pci, u32 reg, size_t size, u32 val) { int ret; if (pci->ops->write_dbi2) { - pci->ops->write_dbi2(pci, base, reg, size, val); + pci->ops->write_dbi2(pci, pci->dbi_base2, reg, size, val); return; } - ret = dw_pcie_write(base + reg, size, val); + ret = dw_pcie_write(pci->dbi_base2 + reg, size, val); if (ret) dev_err(pci->dev, "write DBI address failed\n"); } +u32 dw_pcie_read_atu(struct dw_pcie *pci, u32 reg, size_t size) +{ + int ret; + u32 val; + + if (pci->ops->read_dbi) + return pci->ops->read_dbi(pci, pci->atu_base, reg, size); + + ret = dw_pcie_read(pci->atu_base + reg, size, &val); + if (ret) + dev_err(pci->dev, "Read ATU address failed\n"); + + return val; +} + +void dw_pcie_write_atu(struct dw_pcie *pci, u32 reg, size_t size, u32 val) +{ + int ret; + + if (pci->ops->write_dbi) { + pci->ops->write_dbi(pci, pci->atu_base, reg, size, val); + return; + } + + ret = dw_pcie_write(pci->atu_base + reg, size, val); + if (ret) + dev_err(pci->dev, "Write ATU address failed\n"); +} + static u32 dw_pcie_readl_ob_unroll(struct dw_pcie *pci, u32 index, u32 reg) { u32 offset = PCIE_GET_ATU_OUTB_UNR_REG_OFFSET(index); diff --git a/drivers/pci/controller/dwc/pcie-designware.h b/drivers/pci/controller/dwc/pcie-designware.h index b8993f2b78df..ffed084a0b4f 100644 --- a/drivers/pci/controller/dwc/pcie-designware.h +++ b/drivers/pci/controller/dwc/pcie-designware.h @@ -254,14 +254,12 @@ struct dw_pcie { int dw_pcie_read(void __iomem *addr, int size, u32 *val); int dw_pcie_write(void __iomem *addr, int size, u32 val); -u32 __dw_pcie_read_dbi(struct dw_pcie *pci, void __iomem *base, u32 reg, - size_t size); -void __dw_pcie_write_dbi(struct dw_pcie *pci, void __iomem *base, u32 reg, - size_t size, u32 val); -u32 __dw_pcie_read_dbi2(struct dw_pcie *pci, void __iomem *base, u32 reg, - size_t size); -void __dw_pcie_write_dbi2(struct dw_pcie *pci, void __iomem *base, u32 reg, - size_t size, u32 val); +u32 dw_pcie_read_dbi(struct dw_pcie *pci, u32 reg, size_t size); +void dw_pcie_write_dbi(struct dw_pcie *pci, u32 reg, size_t size, u32 val); +u32 dw_pcie_read_dbi2(struct dw_pcie *pci, u32 reg, size_t size); +void dw_pcie_write_dbi2(struct dw_pcie *pci, u32 reg, size_t size, u32 val); +u32 dw_pcie_read_atu(struct dw_pcie *pci, u32 reg, size_t size); +void dw_pcie_write_atu(struct dw_pcie *pci, u32 reg, size_t size, u32 val); int dw_pcie_link_up(struct dw_pcie *pci); int dw_pcie_wait_for_link(struct dw_pcie *pci); void dw_pcie_prog_outbound_atu(struct dw_pcie *pci, int index, @@ -275,52 +273,52 @@ void dw_pcie_setup(struct dw_pcie *pci); static inline void dw_pcie_writel_dbi(struct dw_pcie *pci, u32 reg, u32 val) { - __dw_pcie_write_dbi(pci, pci->dbi_base, reg, 0x4, val); + dw_pcie_write_dbi(pci, reg, 0x4, val); } static inline u32 dw_pcie_readl_dbi(struct dw_pcie *pci, u32 reg) { - return __dw_pcie_read_dbi(pci, pci->dbi_base, reg, 0x4); + return dw_pcie_read_dbi(pci, reg, 0x4); } static inline void dw_pcie_writew_dbi(struct dw_pcie *pci, u32 reg, u16 val) { - __dw_pcie_write_dbi(pci, pci->dbi_base, reg, 0x2, val); + dw_pcie_write_dbi(pci, reg, 0x2, val); } static inline u16 dw_pcie_readw_dbi(struct dw_pcie *pci, u32 reg) { - return __dw_pcie_read_dbi(pci, pci->dbi_base, reg, 0x2); + return dw_pcie_read_dbi(pci, reg, 0x2); } static inline void dw_pcie_writeb_dbi(struct dw_pcie *pci, u32 reg, u8 val) { - __dw_pcie_write_dbi(pci, pci->dbi_base, reg, 0x1, val); + dw_pcie_write_dbi(pci, reg, 0x1, val); } static inline u8 dw_pcie_readb_dbi(struct dw_pcie *pci, u32 reg) { - return __dw_pcie_read_dbi(pci, pci->dbi_base, reg, 0x1); + return dw_pcie_read_dbi(pci, reg, 0x1); } static inline void dw_pcie_writel_dbi2(struct dw_pcie *pci, u32 reg, u32 val) { - __dw_pcie_write_dbi2(pci, pci->dbi_base2, reg, 0x4, val); + dw_pcie_write_dbi2(pci, reg, 0x4, val); } static inline u32 dw_pcie_readl_dbi2(struct dw_pcie *pci, u32 reg) { - return __dw_pcie_read_dbi2(pci, pci->dbi_base2, reg, 0x4); + return dw_pcie_read_dbi2(pci, reg, 0x4); } static inline void dw_pcie_writel_atu(struct dw_pcie *pci, u32 reg, u32 val) { - __dw_pcie_write_dbi(pci, pci->atu_base, reg, 0x4, val); + dw_pcie_write_atu(pci, reg, 0x4, val); } static inline u32 dw_pcie_readl_atu(struct dw_pcie *pci, u32 reg) { - return __dw_pcie_read_dbi(pci, pci->atu_base, reg, 0x4); + return dw_pcie_read_atu(pci, reg, 0x4); } static inline void dw_pcie_dbi_ro_wr_en(struct dw_pcie *pci) @@ -351,6 +349,7 @@ void dw_pcie_msi_init(struct pcie_port *pp); void dw_pcie_free_msi(struct pcie_port *pp); void dw_pcie_setup_rc(struct pcie_port *pp); int dw_pcie_host_init(struct pcie_port *pp); +void dw_pcie_host_deinit(struct pcie_port *pp); int dw_pcie_allocate_domains(struct pcie_port *pp); #else static inline irqreturn_t dw_handle_msi_irq(struct pcie_port *pp) @@ -375,6 +374,10 @@ static inline int dw_pcie_host_init(struct pcie_port *pp) return 0; } +static inline void dw_pcie_host_deinit(struct pcie_port *pp) +{ +} + static inline int dw_pcie_allocate_domains(struct pcie_port *pp) { return 0; diff --git a/drivers/pci/controller/dwc/pcie-kirin.c b/drivers/pci/controller/dwc/pcie-kirin.c index 9b599296205d..8df1914226be 100644 --- a/drivers/pci/controller/dwc/pcie-kirin.c +++ b/drivers/pci/controller/dwc/pcie-kirin.c @@ -2,7 +2,7 @@ /* * PCIe host controller driver for Kirin Phone SoCs * - * Copyright (C) 2017 Hilisicon Electronics Co., Ltd. + * Copyright (C) 2017 HiSilicon Electronics Co., Ltd. * http://www.huawei.com * * Author: Xiaowei Song <songxiaowei@huawei.com> diff --git a/drivers/pci/controller/dwc/pcie-qcom.c b/drivers/pci/controller/dwc/pcie-qcom.c index 0ed235d560e3..7e581748ee9f 100644 --- a/drivers/pci/controller/dwc/pcie-qcom.c +++ b/drivers/pci/controller/dwc/pcie-qcom.c @@ -112,10 +112,10 @@ struct qcom_pcie_resources_2_3_2 { struct regulator_bulk_data supplies[QCOM_PCIE_2_3_2_MAX_SUPPLY]; }; +#define QCOM_PCIE_2_4_0_MAX_CLOCKS 4 struct qcom_pcie_resources_2_4_0 { - struct clk *aux_clk; - struct clk *master_clk; - struct clk *slave_clk; + struct clk_bulk_data clks[QCOM_PCIE_2_4_0_MAX_CLOCKS]; + int num_clks; struct reset_control *axi_m_reset; struct reset_control *axi_s_reset; struct reset_control *pipe_reset; @@ -178,6 +178,8 @@ static void qcom_ep_reset_assert(struct qcom_pcie *pcie) static void qcom_ep_reset_deassert(struct qcom_pcie *pcie) { + /* Ensure that PERST has been asserted for at least 100 ms */ + msleep(100); gpiod_set_value_cansleep(pcie->reset, 0); usleep_range(PERST_DELAY_US, PERST_DELAY_US + 500); } @@ -638,18 +640,20 @@ static int qcom_pcie_get_resources_2_4_0(struct qcom_pcie *pcie) struct qcom_pcie_resources_2_4_0 *res = &pcie->res.v2_4_0; struct dw_pcie *pci = pcie->pci; struct device *dev = pci->dev; + bool is_ipq = of_device_is_compatible(dev->of_node, "qcom,pcie-ipq4019"); + int ret; - res->aux_clk = devm_clk_get(dev, "aux"); - if (IS_ERR(res->aux_clk)) - return PTR_ERR(res->aux_clk); + res->clks[0].id = "aux"; + res->clks[1].id = "master_bus"; + res->clks[2].id = "slave_bus"; + res->clks[3].id = "iface"; - res->master_clk = devm_clk_get(dev, "master_bus"); - if (IS_ERR(res->master_clk)) - return PTR_ERR(res->master_clk); + /* qcom,pcie-ipq4019 is defined without "iface" */ + res->num_clks = is_ipq ? 3 : 4; - res->slave_clk = devm_clk_get(dev, "slave_bus"); - if (IS_ERR(res->slave_clk)) - return PTR_ERR(res->slave_clk); + ret = devm_clk_bulk_get(dev, res->num_clks, res->clks); + if (ret < 0) + return ret; res->axi_m_reset = devm_reset_control_get_exclusive(dev, "axi_m"); if (IS_ERR(res->axi_m_reset)) @@ -659,27 +663,33 @@ static int qcom_pcie_get_resources_2_4_0(struct qcom_pcie *pcie) if (IS_ERR(res->axi_s_reset)) return PTR_ERR(res->axi_s_reset); - res->pipe_reset = devm_reset_control_get_exclusive(dev, "pipe"); - if (IS_ERR(res->pipe_reset)) - return PTR_ERR(res->pipe_reset); - - res->axi_m_vmid_reset = devm_reset_control_get_exclusive(dev, - "axi_m_vmid"); - if (IS_ERR(res->axi_m_vmid_reset)) - return PTR_ERR(res->axi_m_vmid_reset); - - res->axi_s_xpu_reset = devm_reset_control_get_exclusive(dev, - "axi_s_xpu"); - if (IS_ERR(res->axi_s_xpu_reset)) - return PTR_ERR(res->axi_s_xpu_reset); - - res->parf_reset = devm_reset_control_get_exclusive(dev, "parf"); - if (IS_ERR(res->parf_reset)) - return PTR_ERR(res->parf_reset); - - res->phy_reset = devm_reset_control_get_exclusive(dev, "phy"); - if (IS_ERR(res->phy_reset)) - return PTR_ERR(res->phy_reset); + if (is_ipq) { + /* + * These resources relates to the PHY or are secure clocks, but + * are controlled here for IPQ4019 + */ + res->pipe_reset = devm_reset_control_get_exclusive(dev, "pipe"); + if (IS_ERR(res->pipe_reset)) + return PTR_ERR(res->pipe_reset); + + res->axi_m_vmid_reset = devm_reset_control_get_exclusive(dev, + "axi_m_vmid"); + if (IS_ERR(res->axi_m_vmid_reset)) + return PTR_ERR(res->axi_m_vmid_reset); + + res->axi_s_xpu_reset = devm_reset_control_get_exclusive(dev, + "axi_s_xpu"); + if (IS_ERR(res->axi_s_xpu_reset)) + return PTR_ERR(res->axi_s_xpu_reset); + + res->parf_reset = devm_reset_control_get_exclusive(dev, "parf"); + if (IS_ERR(res->parf_reset)) + return PTR_ERR(res->parf_reset); + + res->phy_reset = devm_reset_control_get_exclusive(dev, "phy"); + if (IS_ERR(res->phy_reset)) + return PTR_ERR(res->phy_reset); + } res->axi_m_sticky_reset = devm_reset_control_get_exclusive(dev, "axi_m_sticky"); @@ -699,9 +709,11 @@ static int qcom_pcie_get_resources_2_4_0(struct qcom_pcie *pcie) if (IS_ERR(res->ahb_reset)) return PTR_ERR(res->ahb_reset); - res->phy_ahb_reset = devm_reset_control_get_exclusive(dev, "phy_ahb"); - if (IS_ERR(res->phy_ahb_reset)) - return PTR_ERR(res->phy_ahb_reset); + if (is_ipq) { + res->phy_ahb_reset = devm_reset_control_get_exclusive(dev, "phy_ahb"); + if (IS_ERR(res->phy_ahb_reset)) + return PTR_ERR(res->phy_ahb_reset); + } return 0; } @@ -719,9 +731,7 @@ static void qcom_pcie_deinit_2_4_0(struct qcom_pcie *pcie) reset_control_assert(res->axi_m_sticky_reset); reset_control_assert(res->pwr_reset); reset_control_assert(res->ahb_reset); - clk_disable_unprepare(res->aux_clk); - clk_disable_unprepare(res->master_clk); - clk_disable_unprepare(res->slave_clk); + clk_bulk_disable_unprepare(res->num_clks, res->clks); } static int qcom_pcie_init_2_4_0(struct qcom_pcie *pcie) @@ -850,23 +860,9 @@ static int qcom_pcie_init_2_4_0(struct qcom_pcie *pcie) usleep_range(10000, 12000); - ret = clk_prepare_enable(res->aux_clk); - if (ret) { - dev_err(dev, "cannot prepare/enable iface clock\n"); - goto err_clk_aux; - } - - ret = clk_prepare_enable(res->master_clk); - if (ret) { - dev_err(dev, "cannot prepare/enable core clock\n"); - goto err_clk_axi_m; - } - - ret = clk_prepare_enable(res->slave_clk); - if (ret) { - dev_err(dev, "cannot prepare/enable phy clock\n"); - goto err_clk_axi_s; - } + ret = clk_bulk_prepare_enable(res->num_clks, res->clks); + if (ret) + goto err_clks; /* enable PCIe clocks and resets */ val = readl(pcie->parf + PCIE20_PARF_PHY_CTRL); @@ -891,11 +887,7 @@ static int qcom_pcie_init_2_4_0(struct qcom_pcie *pcie) return 0; -err_clk_axi_s: - clk_disable_unprepare(res->master_clk); -err_clk_axi_m: - clk_disable_unprepare(res->aux_clk); -err_clk_aux: +err_clks: reset_control_assert(res->ahb_reset); err_rst_ahb: reset_control_assert(res->pwr_reset); @@ -1289,6 +1281,7 @@ static const struct of_device_id qcom_pcie_match[] = { { .compatible = "qcom,pcie-msm8996", .data = &ops_2_3_2 }, { .compatible = "qcom,pcie-ipq8074", .data = &ops_2_3_3 }, { .compatible = "qcom,pcie-ipq4019", .data = &ops_2_4_0 }, + { .compatible = "qcom,pcie-qcs404", .data = &ops_2_4_0 }, { } }; diff --git a/drivers/pci/controller/pci-aardvark.c b/drivers/pci/controller/pci-aardvark.c index 134e0306ff00..fc0fe4d4de49 100644 --- a/drivers/pci/controller/pci-aardvark.c +++ b/drivers/pci/controller/pci-aardvark.c @@ -308,7 +308,7 @@ static void advk_pcie_setup_hw(struct advk_pcie *pcie) advk_writel(pcie, PCIE_ISR1_ALL_MASK, PCIE_ISR1_MASK_REG); - /* Unmask all MSI's */ + /* Unmask all MSIs */ advk_writel(pcie, 0, PCIE_MSI_MASK_REG); /* Enable summary interrupt for GIC SPI source */ diff --git a/drivers/pci/controller/pci-hyperv.c b/drivers/pci/controller/pci-hyperv.c index 82acd6155adf..40b625458afa 100644 --- a/drivers/pci/controller/pci-hyperv.c +++ b/drivers/pci/controller/pci-hyperv.c @@ -1875,6 +1875,7 @@ static void hv_pci_devices_present(struct hv_pcibus_device *hbus, static void hv_eject_device_work(struct work_struct *work) { struct pci_eject_response *ejct_pkt; + struct hv_pcibus_device *hbus; struct hv_pci_dev *hpdev; struct pci_dev *pdev; unsigned long flags; @@ -1885,6 +1886,7 @@ static void hv_eject_device_work(struct work_struct *work) } ctxt; hpdev = container_of(work, struct hv_pci_dev, wrk); + hbus = hpdev->hbus; WARN_ON(hpdev->state != hv_pcichild_ejecting); @@ -1895,8 +1897,7 @@ static void hv_eject_device_work(struct work_struct *work) * because hbus->pci_bus may not exist yet. */ wslot = wslot_to_devfn(hpdev->desc.win_slot.slot); - pdev = pci_get_domain_bus_and_slot(hpdev->hbus->sysdata.domain, 0, - wslot); + pdev = pci_get_domain_bus_and_slot(hbus->sysdata.domain, 0, wslot); if (pdev) { pci_lock_rescan_remove(); pci_stop_and_remove_bus_device(pdev); @@ -1904,9 +1905,9 @@ static void hv_eject_device_work(struct work_struct *work) pci_unlock_rescan_remove(); } - spin_lock_irqsave(&hpdev->hbus->device_list_lock, flags); + spin_lock_irqsave(&hbus->device_list_lock, flags); list_del(&hpdev->list_entry); - spin_unlock_irqrestore(&hpdev->hbus->device_list_lock, flags); + spin_unlock_irqrestore(&hbus->device_list_lock, flags); if (hpdev->pci_slot) pci_destroy_slot(hpdev->pci_slot); @@ -1915,7 +1916,7 @@ static void hv_eject_device_work(struct work_struct *work) ejct_pkt = (struct pci_eject_response *)&ctxt.pkt.message; ejct_pkt->message_type.type = PCI_EJECTION_COMPLETE; ejct_pkt->wslot.slot = hpdev->desc.win_slot.slot; - vmbus_sendpacket(hpdev->hbus->hdev->channel, ejct_pkt, + vmbus_sendpacket(hbus->hdev->channel, ejct_pkt, sizeof(*ejct_pkt), (unsigned long)&ctxt.pkt, VM_PKT_DATA_INBAND, 0); @@ -1924,7 +1925,9 @@ static void hv_eject_device_work(struct work_struct *work) /* For the two refs got in new_pcichild_device() */ put_pcichild(hpdev); put_pcichild(hpdev); - put_hvpcibus(hpdev->hbus); + /* hpdev has been freed. Do not use it any more. */ + + put_hvpcibus(hbus); } /** diff --git a/drivers/pci/controller/pci-tegra.c b/drivers/pci/controller/pci-tegra.c index 464ba2538d52..9a917b2456f6 100644 --- a/drivers/pci/controller/pci-tegra.c +++ b/drivers/pci/controller/pci-tegra.c @@ -17,6 +17,7 @@ #include <linux/debugfs.h> #include <linux/delay.h> #include <linux/export.h> +#include <linux/gpio/consumer.h> #include <linux/interrupt.h> #include <linux/iopoll.h> #include <linux/irq.h> @@ -30,6 +31,7 @@ #include <linux/of_platform.h> #include <linux/pci.h> #include <linux/phy/phy.h> +#include <linux/pinctrl/consumer.h> #include <linux/platform_device.h> #include <linux/reset.h> #include <linux/sizes.h> @@ -95,7 +97,8 @@ #define AFI_MSI_EN_VEC7 0xa8 #define AFI_CONFIGURATION 0xac -#define AFI_CONFIGURATION_EN_FPCI (1 << 0) +#define AFI_CONFIGURATION_EN_FPCI (1 << 0) +#define AFI_CONFIGURATION_CLKEN_OVERRIDE (1 << 31) #define AFI_FPCI_ERROR_MASKS 0xb0 @@ -159,13 +162,14 @@ #define AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_211 (0x1 << 20) #define AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_411 (0x2 << 20) #define AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_111 (0x2 << 20) +#define AFI_PCIE_CONFIG_PCIE_CLKREQ_GPIO(x) (1 << ((x) + 29)) +#define AFI_PCIE_CONFIG_PCIE_CLKREQ_GPIO_ALL (0x7 << 29) #define AFI_FUSE 0x104 #define AFI_FUSE_PCIE_T0_GEN2_DIS (1 << 2) #define AFI_PEX0_CTRL 0x110 #define AFI_PEX1_CTRL 0x118 -#define AFI_PEX2_CTRL 0x128 #define AFI_PEX_CTRL_RST (1 << 0) #define AFI_PEX_CTRL_CLKREQ_EN (1 << 1) #define AFI_PEX_CTRL_REFCLK_EN (1 << 3) @@ -177,20 +181,74 @@ #define AFI_PEXBIAS_CTRL_0 0x168 +#define RP_PRIV_XP_DL 0x00000494 +#define RP_PRIV_XP_DL_GEN2_UPD_FC_TSHOLD (0x1ff << 1) + +#define RP_RX_HDR_LIMIT 0x00000e00 +#define RP_RX_HDR_LIMIT_PW_MASK (0xff << 8) +#define RP_RX_HDR_LIMIT_PW (0x0e << 8) + +#define RP_ECTL_2_R1 0x00000e84 +#define RP_ECTL_2_R1_RX_CTLE_1C_MASK 0xffff + +#define RP_ECTL_4_R1 0x00000e8c +#define RP_ECTL_4_R1_RX_CDR_CTRL_1C_MASK (0xffff << 16) +#define RP_ECTL_4_R1_RX_CDR_CTRL_1C_SHIFT 16 + +#define RP_ECTL_5_R1 0x00000e90 +#define RP_ECTL_5_R1_RX_EQ_CTRL_L_1C_MASK 0xffffffff + +#define RP_ECTL_6_R1 0x00000e94 +#define RP_ECTL_6_R1_RX_EQ_CTRL_H_1C_MASK 0xffffffff + +#define RP_ECTL_2_R2 0x00000ea4 +#define RP_ECTL_2_R2_RX_CTLE_1C_MASK 0xffff + +#define RP_ECTL_4_R2 0x00000eac +#define RP_ECTL_4_R2_RX_CDR_CTRL_1C_MASK (0xffff << 16) +#define RP_ECTL_4_R2_RX_CDR_CTRL_1C_SHIFT 16 + +#define RP_ECTL_5_R2 0x00000eb0 +#define RP_ECTL_5_R2_RX_EQ_CTRL_L_1C_MASK 0xffffffff + +#define RP_ECTL_6_R2 0x00000eb4 +#define RP_ECTL_6_R2_RX_EQ_CTRL_H_1C_MASK 0xffffffff + #define RP_VEND_XP 0x00000f00 -#define RP_VEND_XP_DL_UP (1 << 30) +#define RP_VEND_XP_DL_UP (1 << 30) +#define RP_VEND_XP_OPPORTUNISTIC_ACK (1 << 27) +#define RP_VEND_XP_OPPORTUNISTIC_UPDATEFC (1 << 28) +#define RP_VEND_XP_UPDATE_FC_THRESHOLD_MASK (0xff << 18) + +#define RP_VEND_CTL0 0x00000f44 +#define RP_VEND_CTL0_DSK_RST_PULSE_WIDTH_MASK (0xf << 12) +#define RP_VEND_CTL0_DSK_RST_PULSE_WIDTH (0x9 << 12) + +#define RP_VEND_CTL1 0x00000f48 +#define RP_VEND_CTL1_ERPT (1 << 13) + +#define RP_VEND_XP_BIST 0x00000f4c +#define RP_VEND_XP_BIST_GOTO_L1_L2_AFTER_DLLP_DONE (1 << 28) #define RP_VEND_CTL2 0x00000fa8 #define RP_VEND_CTL2_PCA_ENABLE (1 << 7) #define RP_PRIV_MISC 0x00000fe0 -#define RP_PRIV_MISC_PRSNT_MAP_EP_PRSNT (0xe << 0) -#define RP_PRIV_MISC_PRSNT_MAP_EP_ABSNT (0xf << 0) +#define RP_PRIV_MISC_PRSNT_MAP_EP_PRSNT (0xe << 0) +#define RP_PRIV_MISC_PRSNT_MAP_EP_ABSNT (0xf << 0) +#define RP_PRIV_MISC_CTLR_CLK_CLAMP_THRESHOLD_MASK (0x7f << 16) +#define RP_PRIV_MISC_CTLR_CLK_CLAMP_THRESHOLD (0xf << 16) +#define RP_PRIV_MISC_CTLR_CLK_CLAMP_ENABLE (1 << 23) +#define RP_PRIV_MISC_TMS_CLK_CLAMP_THRESHOLD_MASK (0x7f << 24) +#define RP_PRIV_MISC_TMS_CLK_CLAMP_THRESHOLD (0xf << 24) +#define RP_PRIV_MISC_TMS_CLK_CLAMP_ENABLE (1 << 31) #define RP_LINK_CONTROL_STATUS 0x00000090 #define RP_LINK_CONTROL_STATUS_DL_LINK_ACTIVE 0x20000000 #define RP_LINK_CONTROL_STATUS_LINKSTAT_MASK 0x3fff0000 +#define RP_LINK_CONTROL_STATUS_2 0x000000b0 + #define PADS_CTL_SEL 0x0000009c #define PADS_CTL 0x000000a0 @@ -226,6 +284,7 @@ #define PADS_REFCLK_CFG_DRVI_SHIFT 12 /* 15:12 */ #define PME_ACK_TIMEOUT 10000 +#define LINK_RETRAIN_TIMEOUT 100000 /* in usec */ struct tegra_msi { struct msi_controller chip; @@ -249,10 +308,12 @@ struct tegra_pcie_soc { unsigned int num_ports; const struct tegra_pcie_port_soc *ports; unsigned int msi_base_shift; + unsigned long afi_pex2_ctrl; u32 pads_pll_ctl; u32 tx_ref_sel; u32 pads_refclk_cfg0; u32 pads_refclk_cfg1; + u32 update_fc_threshold; bool has_pex_clkreq_en; bool has_pex_bias_ctrl; bool has_intr_prsnt_sense; @@ -260,6 +321,24 @@ struct tegra_pcie_soc { bool has_gen2; bool force_pca_enable; bool program_uphy; + bool update_clamp_threshold; + bool program_deskew_time; + bool raw_violation_fixup; + bool update_fc_timer; + bool has_cache_bars; + struct { + struct { + u32 rp_ectl_2_r1; + u32 rp_ectl_4_r1; + u32 rp_ectl_5_r1; + u32 rp_ectl_6_r1; + u32 rp_ectl_2_r2; + u32 rp_ectl_4_r2; + u32 rp_ectl_5_r2; + u32 rp_ectl_6_r2; + } regs; + bool enable; + } ectl; }; static inline struct tegra_msi *to_tegra_msi(struct msi_controller *chip) @@ -321,6 +400,8 @@ struct tegra_pcie_port { unsigned int lanes; struct phy **phys; + + struct gpio_desc *reset_gpio; }; struct tegra_pcie_bus { @@ -440,6 +521,7 @@ static struct pci_ops tegra_pcie_ops = { static unsigned long tegra_pcie_port_get_pex_ctrl(struct tegra_pcie_port *port) { + const struct tegra_pcie_soc *soc = port->pcie->soc; unsigned long ret = 0; switch (port->index) { @@ -452,7 +534,7 @@ static unsigned long tegra_pcie_port_get_pex_ctrl(struct tegra_pcie_port *port) break; case 2: - ret = AFI_PEX2_CTRL; + ret = soc->afi_pex2_ctrl; break; } @@ -465,15 +547,162 @@ static void tegra_pcie_port_reset(struct tegra_pcie_port *port) unsigned long value; /* pulse reset signal */ - value = afi_readl(port->pcie, ctrl); - value &= ~AFI_PEX_CTRL_RST; - afi_writel(port->pcie, value, ctrl); + if (port->reset_gpio) { + gpiod_set_value(port->reset_gpio, 1); + } else { + value = afi_readl(port->pcie, ctrl); + value &= ~AFI_PEX_CTRL_RST; + afi_writel(port->pcie, value, ctrl); + } usleep_range(1000, 2000); - value = afi_readl(port->pcie, ctrl); - value |= AFI_PEX_CTRL_RST; - afi_writel(port->pcie, value, ctrl); + if (port->reset_gpio) { + gpiod_set_value(port->reset_gpio, 0); + } else { + value = afi_readl(port->pcie, ctrl); + value |= AFI_PEX_CTRL_RST; + afi_writel(port->pcie, value, ctrl); + } +} + +static void tegra_pcie_enable_rp_features(struct tegra_pcie_port *port) +{ + const struct tegra_pcie_soc *soc = port->pcie->soc; + u32 value; + + /* Enable AER capability */ + value = readl(port->base + RP_VEND_CTL1); + value |= RP_VEND_CTL1_ERPT; + writel(value, port->base + RP_VEND_CTL1); + + /* Optimal settings to enhance bandwidth */ + value = readl(port->base + RP_VEND_XP); + value |= RP_VEND_XP_OPPORTUNISTIC_ACK; + value |= RP_VEND_XP_OPPORTUNISTIC_UPDATEFC; + writel(value, port->base + RP_VEND_XP); + + /* + * LTSSM will wait for DLLP to finish before entering L1 or L2, + * to avoid truncation of PM messages which results in receiver errors + */ + value = readl(port->base + RP_VEND_XP_BIST); + value |= RP_VEND_XP_BIST_GOTO_L1_L2_AFTER_DLLP_DONE; + writel(value, port->base + RP_VEND_XP_BIST); + + value = readl(port->base + RP_PRIV_MISC); + value |= RP_PRIV_MISC_CTLR_CLK_CLAMP_ENABLE; + value |= RP_PRIV_MISC_TMS_CLK_CLAMP_ENABLE; + + if (soc->update_clamp_threshold) { + value &= ~(RP_PRIV_MISC_CTLR_CLK_CLAMP_THRESHOLD_MASK | + RP_PRIV_MISC_TMS_CLK_CLAMP_THRESHOLD_MASK); + value |= RP_PRIV_MISC_CTLR_CLK_CLAMP_THRESHOLD | + RP_PRIV_MISC_TMS_CLK_CLAMP_THRESHOLD; + } + + writel(value, port->base + RP_PRIV_MISC); +} + +static void tegra_pcie_program_ectl_settings(struct tegra_pcie_port *port) +{ + const struct tegra_pcie_soc *soc = port->pcie->soc; + u32 value; + + value = readl(port->base + RP_ECTL_2_R1); + value &= ~RP_ECTL_2_R1_RX_CTLE_1C_MASK; + value |= soc->ectl.regs.rp_ectl_2_r1; + writel(value, port->base + RP_ECTL_2_R1); + + value = readl(port->base + RP_ECTL_4_R1); + value &= ~RP_ECTL_4_R1_RX_CDR_CTRL_1C_MASK; + value |= soc->ectl.regs.rp_ectl_4_r1 << + RP_ECTL_4_R1_RX_CDR_CTRL_1C_SHIFT; + writel(value, port->base + RP_ECTL_4_R1); + + value = readl(port->base + RP_ECTL_5_R1); + value &= ~RP_ECTL_5_R1_RX_EQ_CTRL_L_1C_MASK; + value |= soc->ectl.regs.rp_ectl_5_r1; + writel(value, port->base + RP_ECTL_5_R1); + + value = readl(port->base + RP_ECTL_6_R1); + value &= ~RP_ECTL_6_R1_RX_EQ_CTRL_H_1C_MASK; + value |= soc->ectl.regs.rp_ectl_6_r1; + writel(value, port->base + RP_ECTL_6_R1); + + value = readl(port->base + RP_ECTL_2_R2); + value &= ~RP_ECTL_2_R2_RX_CTLE_1C_MASK; + value |= soc->ectl.regs.rp_ectl_2_r2; + writel(value, port->base + RP_ECTL_2_R2); + + value = readl(port->base + RP_ECTL_4_R2); + value &= ~RP_ECTL_4_R2_RX_CDR_CTRL_1C_MASK; + value |= soc->ectl.regs.rp_ectl_4_r2 << + RP_ECTL_4_R2_RX_CDR_CTRL_1C_SHIFT; + writel(value, port->base + RP_ECTL_4_R2); + + value = readl(port->base + RP_ECTL_5_R2); + value &= ~RP_ECTL_5_R2_RX_EQ_CTRL_L_1C_MASK; + value |= soc->ectl.regs.rp_ectl_5_r2; + writel(value, port->base + RP_ECTL_5_R2); + + value = readl(port->base + RP_ECTL_6_R2); + value &= ~RP_ECTL_6_R2_RX_EQ_CTRL_H_1C_MASK; + value |= soc->ectl.regs.rp_ectl_6_r2; + writel(value, port->base + RP_ECTL_6_R2); +} + +static void tegra_pcie_apply_sw_fixup(struct tegra_pcie_port *port) +{ + const struct tegra_pcie_soc *soc = port->pcie->soc; + u32 value; + + /* + * Sometimes link speed change from Gen2 to Gen1 fails due to + * instability in deskew logic on lane-0. Increase the deskew + * retry time to resolve this issue. + */ + if (soc->program_deskew_time) { + value = readl(port->base + RP_VEND_CTL0); + value &= ~RP_VEND_CTL0_DSK_RST_PULSE_WIDTH_MASK; + value |= RP_VEND_CTL0_DSK_RST_PULSE_WIDTH; + writel(value, port->base + RP_VEND_CTL0); + } + + /* Fixup for read after write violation. */ + if (soc->raw_violation_fixup) { + value = readl(port->base + RP_RX_HDR_LIMIT); + value &= ~RP_RX_HDR_LIMIT_PW_MASK; + value |= RP_RX_HDR_LIMIT_PW; + writel(value, port->base + RP_RX_HDR_LIMIT); + + value = readl(port->base + RP_PRIV_XP_DL); + value |= RP_PRIV_XP_DL_GEN2_UPD_FC_TSHOLD; + writel(value, port->base + RP_PRIV_XP_DL); + + value = readl(port->base + RP_VEND_XP); + value &= ~RP_VEND_XP_UPDATE_FC_THRESHOLD_MASK; + value |= soc->update_fc_threshold; + writel(value, port->base + RP_VEND_XP); + } + + if (soc->update_fc_timer) { + value = readl(port->base + RP_VEND_XP); + value &= ~RP_VEND_XP_UPDATE_FC_THRESHOLD_MASK; + value |= soc->update_fc_threshold; + writel(value, port->base + RP_VEND_XP); + } + + /* + * PCIe link doesn't come up with few legacy PCIe endpoints if + * root port advertises both Gen-1 and Gen-2 speeds in Tegra. + * Hence, the strategy followed here is to initially advertise + * only Gen-1 and after link is up, retrain link to Gen-2 speed + */ + value = readl(port->base + RP_LINK_CONTROL_STATUS_2); + value &= ~PCI_EXP_LNKSTA_CLS; + value |= PCI_EXP_LNKSTA_CLS_2_5GB; + writel(value, port->base + RP_LINK_CONTROL_STATUS_2); } static void tegra_pcie_port_enable(struct tegra_pcie_port *port) @@ -500,6 +729,13 @@ static void tegra_pcie_port_enable(struct tegra_pcie_port *port) value |= RP_VEND_CTL2_PCA_ENABLE; writel(value, port->base + RP_VEND_CTL2); } + + tegra_pcie_enable_rp_features(port); + + if (soc->ectl.enable) + tegra_pcie_program_ectl_settings(port); + + tegra_pcie_apply_sw_fixup(port); } static void tegra_pcie_port_disable(struct tegra_pcie_port *port) @@ -521,6 +757,12 @@ static void tegra_pcie_port_disable(struct tegra_pcie_port *port) value &= ~AFI_PEX_CTRL_REFCLK_EN; afi_writel(port->pcie, value, ctrl); + + /* disable PCIe port and set CLKREQ# as GPIO to allow PLLE power down */ + value = afi_readl(port->pcie, AFI_PCIE_CONFIG); + value |= AFI_PCIE_CONFIG_PCIE_DISABLE(port->index); + value |= AFI_PCIE_CONFIG_PCIE_CLKREQ_GPIO(port->index); + afi_writel(port->pcie, value, AFI_PCIE_CONFIG); } static void tegra_pcie_port_free(struct tegra_pcie_port *port) @@ -545,12 +787,15 @@ DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_NVIDIA, 0x0bf1, tegra_pcie_fixup_class); DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_NVIDIA, 0x0e1c, tegra_pcie_fixup_class); DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_NVIDIA, 0x0e1d, tegra_pcie_fixup_class); -/* Tegra PCIE requires relaxed ordering */ +/* Tegra20 and Tegra30 PCIE requires relaxed ordering */ static void tegra_pcie_relax_enable(struct pci_dev *dev) { pcie_capability_set_word(dev, PCI_EXP_DEVCTL, PCI_EXP_DEVCTL_RELAX_EN); } -DECLARE_PCI_FIXUP_FINAL(PCI_ANY_ID, PCI_ANY_ID, tegra_pcie_relax_enable); +DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_NVIDIA, 0x0bf0, tegra_pcie_relax_enable); +DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_NVIDIA, 0x0bf1, tegra_pcie_relax_enable); +DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_NVIDIA, 0x0e1c, tegra_pcie_relax_enable); +DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_NVIDIA, 0x0e1d, tegra_pcie_relax_enable); static int tegra_pcie_request_resources(struct tegra_pcie *pcie) { @@ -635,7 +880,7 @@ static irqreturn_t tegra_pcie_isr(int irq, void *arg) * do not pollute kernel log with master abort reports since they * happen a lot during enumeration */ - if (code == AFI_INTR_MASTER_ABORT) + if (code == AFI_INTR_MASTER_ABORT || code == AFI_INTR_PE_PRSNT_SENSE) dev_dbg(dev, "%s, signature: %08x\n", err_msg[code], signature); else dev_err(dev, "%s, signature: %08x\n", err_msg[code], signature); @@ -704,11 +949,13 @@ static void tegra_pcie_setup_translations(struct tegra_pcie *pcie) afi_writel(pcie, 0, AFI_AXI_BAR5_SZ); afi_writel(pcie, 0, AFI_FPCI_BAR5); - /* map all upstream transactions as uncached */ - afi_writel(pcie, 0, AFI_CACHE_BAR0_ST); - afi_writel(pcie, 0, AFI_CACHE_BAR0_SZ); - afi_writel(pcie, 0, AFI_CACHE_BAR1_ST); - afi_writel(pcie, 0, AFI_CACHE_BAR1_SZ); + if (pcie->soc->has_cache_bars) { + /* map all upstream transactions as uncached */ + afi_writel(pcie, 0, AFI_CACHE_BAR0_ST); + afi_writel(pcie, 0, AFI_CACHE_BAR0_SZ); + afi_writel(pcie, 0, AFI_CACHE_BAR1_ST); + afi_writel(pcie, 0, AFI_CACHE_BAR1_SZ); + } /* MSI translations are setup only when needed */ afi_writel(pcie, 0, AFI_MSI_FPCI_BAR_ST); @@ -852,7 +1099,6 @@ static int tegra_pcie_port_phy_power_off(struct tegra_pcie_port *port) static int tegra_pcie_phy_power_on(struct tegra_pcie *pcie) { struct device *dev = pcie->dev; - const struct tegra_pcie_soc *soc = pcie->soc; struct tegra_pcie_port *port; int err; @@ -878,12 +1124,6 @@ static int tegra_pcie_phy_power_on(struct tegra_pcie *pcie) } } - /* Configure the reference clock driver */ - pads_writel(pcie, soc->pads_refclk_cfg0, PADS_REFCLK_CFG0); - - if (soc->num_ports > 2) - pads_writel(pcie, soc->pads_refclk_cfg1, PADS_REFCLK_CFG1); - return 0; } @@ -918,13 +1158,11 @@ static int tegra_pcie_phy_power_off(struct tegra_pcie *pcie) return 0; } -static int tegra_pcie_enable_controller(struct tegra_pcie *pcie) +static void tegra_pcie_enable_controller(struct tegra_pcie *pcie) { - struct device *dev = pcie->dev; const struct tegra_pcie_soc *soc = pcie->soc; struct tegra_pcie_port *port; unsigned long value; - int err; /* enable PLL power down */ if (pcie->phy) { @@ -942,9 +1180,12 @@ static int tegra_pcie_enable_controller(struct tegra_pcie *pcie) value = afi_readl(pcie, AFI_PCIE_CONFIG); value &= ~AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_MASK; value |= AFI_PCIE_CONFIG_PCIE_DISABLE_ALL | pcie->xbar_config; + value |= AFI_PCIE_CONFIG_PCIE_CLKREQ_GPIO_ALL; - list_for_each_entry(port, &pcie->ports, list) + list_for_each_entry(port, &pcie->ports, list) { value &= ~AFI_PCIE_CONFIG_PCIE_DISABLE(port->index); + value &= ~AFI_PCIE_CONFIG_PCIE_CLKREQ_GPIO(port->index); + } afi_writel(pcie, value, AFI_PCIE_CONFIG); @@ -958,20 +1199,10 @@ static int tegra_pcie_enable_controller(struct tegra_pcie *pcie) afi_writel(pcie, value, AFI_FUSE); } - if (soc->program_uphy) { - err = tegra_pcie_phy_power_on(pcie); - if (err < 0) { - dev_err(dev, "failed to power on PHY(s): %d\n", err); - return err; - } - } - - /* take the PCIe interface module out of reset */ - reset_control_deassert(pcie->pcie_xrst); - - /* finally enable PCIe */ + /* Disable AFI dynamic clock gating and enable PCIe */ value = afi_readl(pcie, AFI_CONFIGURATION); value |= AFI_CONFIGURATION_EN_FPCI; + value |= AFI_CONFIGURATION_CLKEN_OVERRIDE; afi_writel(pcie, value, AFI_CONFIGURATION); value = AFI_INTR_EN_INI_SLVERR | AFI_INTR_EN_INI_DECERR | @@ -989,22 +1220,6 @@ static int tegra_pcie_enable_controller(struct tegra_pcie *pcie) /* disable all exceptions */ afi_writel(pcie, 0, AFI_FPCI_ERROR_MASKS); - - return 0; -} - -static void tegra_pcie_disable_controller(struct tegra_pcie *pcie) -{ - int err; - - reset_control_assert(pcie->pcie_xrst); - - if (pcie->soc->program_uphy) { - err = tegra_pcie_phy_power_off(pcie); - if (err < 0) - dev_err(pcie->dev, "failed to power off PHY(s): %d\n", - err); - } } static void tegra_pcie_power_off(struct tegra_pcie *pcie) @@ -1014,13 +1229,11 @@ static void tegra_pcie_power_off(struct tegra_pcie *pcie) int err; reset_control_assert(pcie->afi_rst); - reset_control_assert(pcie->pex_rst); clk_disable_unprepare(pcie->pll_e); if (soc->has_cml_clk) clk_disable_unprepare(pcie->cml_clk); clk_disable_unprepare(pcie->afi_clk); - clk_disable_unprepare(pcie->pex_clk); if (!dev->pm_domain) tegra_powergate_power_off(TEGRA_POWERGATE_PCIE); @@ -1048,46 +1261,66 @@ static int tegra_pcie_power_on(struct tegra_pcie *pcie) if (err < 0) dev_err(dev, "failed to enable regulators: %d\n", err); - if (dev->pm_domain) { - err = clk_prepare_enable(pcie->pex_clk); + if (!dev->pm_domain) { + err = tegra_powergate_power_on(TEGRA_POWERGATE_PCIE); if (err) { - dev_err(dev, "failed to enable PEX clock: %d\n", err); - return err; + dev_err(dev, "failed to power ungate: %d\n", err); + goto regulator_disable; } - reset_control_deassert(pcie->pex_rst); - } else { - err = tegra_powergate_sequence_power_up(TEGRA_POWERGATE_PCIE, - pcie->pex_clk, - pcie->pex_rst); + err = tegra_powergate_remove_clamping(TEGRA_POWERGATE_PCIE); if (err) { - dev_err(dev, "powerup sequence failed: %d\n", err); - return err; + dev_err(dev, "failed to remove clamp: %d\n", err); + goto powergate; } } - reset_control_deassert(pcie->afi_rst); - err = clk_prepare_enable(pcie->afi_clk); if (err < 0) { dev_err(dev, "failed to enable AFI clock: %d\n", err); - return err; + goto powergate; } if (soc->has_cml_clk) { err = clk_prepare_enable(pcie->cml_clk); if (err < 0) { dev_err(dev, "failed to enable CML clock: %d\n", err); - return err; + goto disable_afi_clk; } } err = clk_prepare_enable(pcie->pll_e); if (err < 0) { dev_err(dev, "failed to enable PLLE clock: %d\n", err); - return err; + goto disable_cml_clk; } + reset_control_deassert(pcie->afi_rst); + return 0; + +disable_cml_clk: + if (soc->has_cml_clk) + clk_disable_unprepare(pcie->cml_clk); +disable_afi_clk: + clk_disable_unprepare(pcie->afi_clk); +powergate: + if (!dev->pm_domain) + tegra_powergate_power_off(TEGRA_POWERGATE_PCIE); +regulator_disable: + regulator_bulk_disable(pcie->num_supplies, pcie->supplies); + + return err; +} + +static void tegra_pcie_apply_pad_settings(struct tegra_pcie *pcie) +{ + const struct tegra_pcie_soc *soc = pcie->soc; + + /* Configure the reference clock driver */ + pads_writel(pcie, soc->pads_refclk_cfg0, PADS_REFCLK_CFG0); + + if (soc->num_ports > 2) + pads_writel(pcie, soc->pads_refclk_cfg1, PADS_REFCLK_CFG1); } static int tegra_pcie_clocks_get(struct tegra_pcie *pcie) @@ -1647,6 +1880,15 @@ static int tegra_pcie_disable_msi(struct tegra_pcie *pcie) return 0; } +static void tegra_pcie_disable_interrupts(struct tegra_pcie *pcie) +{ + u32 value; + + value = afi_readl(pcie, AFI_INTR_MASK); + value &= ~AFI_INTR_MASK_INT_MASK; + afi_writel(pcie, value, AFI_INTR_MASK); +} + static int tegra_pcie_get_xbar_config(struct tegra_pcie *pcie, u32 lanes, u32 *xbar) { @@ -1990,6 +2232,7 @@ static int tegra_pcie_parse_dt(struct tegra_pcie *pcie) struct tegra_pcie_port *rp; unsigned int index; u32 value; + char *label; err = of_pci_get_devfn(port); if (err < 0) { @@ -2048,6 +2291,31 @@ static int tegra_pcie_parse_dt(struct tegra_pcie *pcie) if (IS_ERR(rp->base)) return PTR_ERR(rp->base); + label = devm_kasprintf(dev, GFP_KERNEL, "pex-reset-%u", index); + if (!label) { + dev_err(dev, "failed to create reset GPIO label\n"); + return -ENOMEM; + } + + /* + * Returns -ENOENT if reset-gpios property is not populated + * and in this case fall back to using AFI per port register + * to toggle PERST# SFIO line. + */ + rp->reset_gpio = devm_gpiod_get_from_of_node(dev, port, + "reset-gpios", 0, + GPIOD_OUT_LOW, + label); + if (IS_ERR(rp->reset_gpio)) { + if (PTR_ERR(rp->reset_gpio) == -ENOENT) { + rp->reset_gpio = NULL; + } else { + dev_err(dev, "failed to get reset GPIO: %d\n", + err); + return PTR_ERR(rp->reset_gpio); + } + } + list_add_tail(&rp->list, &pcie->ports); } @@ -2095,7 +2363,7 @@ static bool tegra_pcie_port_check_link(struct tegra_pcie_port *port) } while (--timeout); if (!timeout) { - dev_err(dev, "link %u down, retrying\n", port->index); + dev_dbg(dev, "link %u down, retrying\n", port->index); goto retry; } @@ -2117,6 +2385,64 @@ retry: return false; } +static void tegra_pcie_change_link_speed(struct tegra_pcie *pcie) +{ + struct device *dev = pcie->dev; + struct tegra_pcie_port *port; + ktime_t deadline; + u32 value; + + list_for_each_entry(port, &pcie->ports, list) { + /* + * "Supported Link Speeds Vector" in "Link Capabilities 2" + * is not supported by Tegra. tegra_pcie_change_link_speed() + * is called only for Tegra chips which support Gen2. + * So there no harm if supported link speed is not verified. + */ + value = readl(port->base + RP_LINK_CONTROL_STATUS_2); + value &= ~PCI_EXP_LNKSTA_CLS; + value |= PCI_EXP_LNKSTA_CLS_5_0GB; + writel(value, port->base + RP_LINK_CONTROL_STATUS_2); + + /* + * Poll until link comes back from recovery to avoid race + * condition. + */ + deadline = ktime_add_us(ktime_get(), LINK_RETRAIN_TIMEOUT); + + while (ktime_before(ktime_get(), deadline)) { + value = readl(port->base + RP_LINK_CONTROL_STATUS); + if ((value & PCI_EXP_LNKSTA_LT) == 0) + break; + + usleep_range(2000, 3000); + } + + if (value & PCI_EXP_LNKSTA_LT) + dev_warn(dev, "PCIe port %u link is in recovery\n", + port->index); + + /* Retrain the link */ + value = readl(port->base + RP_LINK_CONTROL_STATUS); + value |= PCI_EXP_LNKCTL_RL; + writel(value, port->base + RP_LINK_CONTROL_STATUS); + + deadline = ktime_add_us(ktime_get(), LINK_RETRAIN_TIMEOUT); + + while (ktime_before(ktime_get(), deadline)) { + value = readl(port->base + RP_LINK_CONTROL_STATUS); + if ((value & PCI_EXP_LNKSTA_LT) == 0) + break; + + usleep_range(2000, 3000); + } + + if (value & PCI_EXP_LNKSTA_LT) + dev_err(dev, "failed to retrain link of port %u\n", + port->index); + } +} + static void tegra_pcie_enable_ports(struct tegra_pcie *pcie) { struct device *dev = pcie->dev; @@ -2127,7 +2453,12 @@ static void tegra_pcie_enable_ports(struct tegra_pcie *pcie) port->index, port->lanes); tegra_pcie_port_enable(port); + } + /* Start LTSSM from Tegra side */ + reset_control_deassert(pcie->pcie_xrst); + + list_for_each_entry_safe(port, tmp, &pcie->ports, list) { if (tegra_pcie_port_check_link(port)) continue; @@ -2136,12 +2467,17 @@ static void tegra_pcie_enable_ports(struct tegra_pcie *pcie) tegra_pcie_port_disable(port); tegra_pcie_port_free(port); } + + if (pcie->soc->has_gen2) + tegra_pcie_change_link_speed(pcie); } static void tegra_pcie_disable_ports(struct tegra_pcie *pcie) { struct tegra_pcie_port *port, *tmp; + reset_control_assert(pcie->pcie_xrst); + list_for_each_entry_safe(port, tmp, &pcie->ports, list) tegra_pcie_port_disable(port); } @@ -2155,6 +2491,7 @@ static const struct tegra_pcie_soc tegra20_pcie = { .num_ports = 2, .ports = tegra20_pcie_ports, .msi_base_shift = 0, + .afi_pex2_ctrl = 0x128, .pads_pll_ctl = PADS_PLL_CTL_TEGRA20, .tx_ref_sel = PADS_PLL_CTL_TXCLKREF_DIV10, .pads_refclk_cfg0 = 0xfa5cfa5c, @@ -2165,6 +2502,12 @@ static const struct tegra_pcie_soc tegra20_pcie = { .has_gen2 = false, .force_pca_enable = false, .program_uphy = true, + .update_clamp_threshold = false, + .program_deskew_time = false, + .raw_violation_fixup = false, + .update_fc_timer = false, + .has_cache_bars = true, + .ectl.enable = false, }; static const struct tegra_pcie_port_soc tegra30_pcie_ports[] = { @@ -2188,6 +2531,12 @@ static const struct tegra_pcie_soc tegra30_pcie = { .has_gen2 = false, .force_pca_enable = false, .program_uphy = true, + .update_clamp_threshold = false, + .program_deskew_time = false, + .raw_violation_fixup = false, + .update_fc_timer = false, + .has_cache_bars = false, + .ectl.enable = false, }; static const struct tegra_pcie_soc tegra124_pcie = { @@ -2197,6 +2546,8 @@ static const struct tegra_pcie_soc tegra124_pcie = { .pads_pll_ctl = PADS_PLL_CTL_TEGRA30, .tx_ref_sel = PADS_PLL_CTL_TXCLKREF_BUF_EN, .pads_refclk_cfg0 = 0x44ac44ac, + /* FC threshold is bit[25:18] */ + .update_fc_threshold = 0x03fc0000, .has_pex_clkreq_en = true, .has_pex_bias_ctrl = true, .has_intr_prsnt_sense = true, @@ -2204,6 +2555,12 @@ static const struct tegra_pcie_soc tegra124_pcie = { .has_gen2 = true, .force_pca_enable = false, .program_uphy = true, + .update_clamp_threshold = true, + .program_deskew_time = false, + .raw_violation_fixup = true, + .update_fc_timer = false, + .has_cache_bars = false, + .ectl.enable = false, }; static const struct tegra_pcie_soc tegra210_pcie = { @@ -2213,6 +2570,8 @@ static const struct tegra_pcie_soc tegra210_pcie = { .pads_pll_ctl = PADS_PLL_CTL_TEGRA30, .tx_ref_sel = PADS_PLL_CTL_TXCLKREF_BUF_EN, .pads_refclk_cfg0 = 0x90b890b8, + /* FC threshold is bit[25:18] */ + .update_fc_threshold = 0x01800000, .has_pex_clkreq_en = true, .has_pex_bias_ctrl = true, .has_intr_prsnt_sense = true, @@ -2220,6 +2579,24 @@ static const struct tegra_pcie_soc tegra210_pcie = { .has_gen2 = true, .force_pca_enable = true, .program_uphy = true, + .update_clamp_threshold = true, + .program_deskew_time = true, + .raw_violation_fixup = false, + .update_fc_timer = true, + .has_cache_bars = false, + .ectl = { + .regs = { + .rp_ectl_2_r1 = 0x0000000f, + .rp_ectl_4_r1 = 0x00000067, + .rp_ectl_5_r1 = 0x55010000, + .rp_ectl_6_r1 = 0x00000001, + .rp_ectl_2_r2 = 0x0000008f, + .rp_ectl_4_r2 = 0x000000c7, + .rp_ectl_5_r2 = 0x55010000, + .rp_ectl_6_r2 = 0x00000001, + }, + .enable = true, + }, }; static const struct tegra_pcie_port_soc tegra186_pcie_ports[] = { @@ -2232,6 +2609,7 @@ static const struct tegra_pcie_soc tegra186_pcie = { .num_ports = 3, .ports = tegra186_pcie_ports, .msi_base_shift = 8, + .afi_pex2_ctrl = 0x19c, .pads_pll_ctl = PADS_PLL_CTL_TEGRA30, .tx_ref_sel = PADS_PLL_CTL_TXCLKREF_BUF_EN, .pads_refclk_cfg0 = 0x80b880b8, @@ -2243,6 +2621,12 @@ static const struct tegra_pcie_soc tegra186_pcie = { .has_gen2 = true, .force_pca_enable = false, .program_uphy = false, + .update_clamp_threshold = false, + .program_deskew_time = false, + .raw_violation_fixup = false, + .update_fc_timer = false, + .has_cache_bars = false, + .ectl.enable = false, }; static const struct of_device_id tegra_pcie_of_match[] = { @@ -2485,16 +2869,32 @@ static int __maybe_unused tegra_pcie_pm_suspend(struct device *dev) { struct tegra_pcie *pcie = dev_get_drvdata(dev); struct tegra_pcie_port *port; + int err; list_for_each_entry(port, &pcie->ports, list) tegra_pcie_pme_turnoff(port); tegra_pcie_disable_ports(pcie); + /* + * AFI_INTR is unmasked in tegra_pcie_enable_controller(), mask it to + * avoid unwanted interrupts raised by AFI after pex_rst is asserted. + */ + tegra_pcie_disable_interrupts(pcie); + + if (pcie->soc->program_uphy) { + err = tegra_pcie_phy_power_off(pcie); + if (err < 0) + dev_err(dev, "failed to power off PHY(s): %d\n", err); + } + + reset_control_assert(pcie->pex_rst); + clk_disable_unprepare(pcie->pex_clk); + if (IS_ENABLED(CONFIG_PCI_MSI)) tegra_pcie_disable_msi(pcie); - tegra_pcie_disable_controller(pcie); + pinctrl_pm_select_idle_state(dev); tegra_pcie_power_off(pcie); return 0; @@ -2510,20 +2910,45 @@ static int __maybe_unused tegra_pcie_pm_resume(struct device *dev) dev_err(dev, "tegra pcie power on fail: %d\n", err); return err; } - err = tegra_pcie_enable_controller(pcie); - if (err) { - dev_err(dev, "tegra pcie controller enable fail: %d\n", err); + + err = pinctrl_pm_select_default_state(dev); + if (err < 0) { + dev_err(dev, "failed to disable PCIe IO DPD: %d\n", err); goto poweroff; } + + tegra_pcie_enable_controller(pcie); tegra_pcie_setup_translations(pcie); if (IS_ENABLED(CONFIG_PCI_MSI)) tegra_pcie_enable_msi(pcie); + err = clk_prepare_enable(pcie->pex_clk); + if (err) { + dev_err(dev, "failed to enable PEX clock: %d\n", err); + goto pex_dpd_enable; + } + + reset_control_deassert(pcie->pex_rst); + + if (pcie->soc->program_uphy) { + err = tegra_pcie_phy_power_on(pcie); + if (err < 0) { + dev_err(dev, "failed to power on PHY(s): %d\n", err); + goto disable_pex_clk; + } + } + + tegra_pcie_apply_pad_settings(pcie); tegra_pcie_enable_ports(pcie); return 0; +disable_pex_clk: + reset_control_assert(pcie->pex_rst); + clk_disable_unprepare(pcie->pex_clk); +pex_dpd_enable: + pinctrl_pm_select_idle_state(dev); poweroff: tegra_pcie_power_off(pcie); diff --git a/drivers/pci/controller/pcie-altera-msi.c b/drivers/pci/controller/pcie-altera-msi.c index 025ef7d9a046..16d938920ca5 100644 --- a/drivers/pci/controller/pcie-altera-msi.c +++ b/drivers/pci/controller/pcie-altera-msi.c @@ -10,6 +10,7 @@ #include <linux/interrupt.h> #include <linux/irqchip/chained_irq.h> #include <linux/init.h> +#include <linux/module.h> #include <linux/msi.h> #include <linux/of_address.h> #include <linux/of_irq.h> @@ -288,4 +289,13 @@ static int __init altera_msi_init(void) { return platform_driver_register(&altera_msi_driver); } + +static void __exit altera_msi_exit(void) +{ + platform_driver_unregister(&altera_msi_driver); +} + subsys_initcall(altera_msi_init); +MODULE_DEVICE_TABLE(of, altera_msi_of_match); +module_exit(altera_msi_exit); +MODULE_LICENSE("GPL v2"); diff --git a/drivers/pci/controller/pcie-altera.c b/drivers/pci/controller/pcie-altera.c index 27edcebd1726..d2497ca43828 100644 --- a/drivers/pci/controller/pcie-altera.c +++ b/drivers/pci/controller/pcie-altera.c @@ -10,6 +10,7 @@ #include <linux/interrupt.h> #include <linux/irqchip/chained_irq.h> #include <linux/init.h> +#include <linux/module.h> #include <linux/of_address.h> #include <linux/of_device.h> #include <linux/of_irq.h> @@ -43,6 +44,8 @@ #define S10_RP_RXCPL_STATUS 0x200C #define S10_RP_CFG_ADDR(pcie, reg) \ (((pcie)->hip_base) + (reg) + (1 << 20)) +#define S10_RP_SECONDARY(pcie) \ + readb(S10_RP_CFG_ADDR(pcie, PCI_SECONDARY_BUS)) /* TLP configuration type 0 and 1 */ #define TLP_FMTTYPE_CFGRD0 0x04 /* Configuration Read Type 0 */ @@ -54,14 +57,9 @@ #define TLP_WRITE_TAG 0x10 #define RP_DEVFN 0 #define TLP_REQ_ID(bus, devfn) (((bus) << 8) | (devfn)) -#define TLP_CFGRD_DW0(pcie, bus) \ - ((((bus == pcie->root_bus_nr) ? pcie->pcie_data->cfgrd0 \ - : pcie->pcie_data->cfgrd1) << 24) | \ - TLP_PAYLOAD_SIZE) -#define TLP_CFGWR_DW0(pcie, bus) \ - ((((bus == pcie->root_bus_nr) ? pcie->pcie_data->cfgwr0 \ - : pcie->pcie_data->cfgwr1) << 24) | \ - TLP_PAYLOAD_SIZE) +#define TLP_CFG_DW0(pcie, cfg) \ + (((cfg) << 24) | \ + TLP_PAYLOAD_SIZE) #define TLP_CFG_DW1(pcie, tag, be) \ (((TLP_REQ_ID(pcie->root_bus_nr, RP_DEVFN)) << 16) | (tag << 8) | (be)) #define TLP_CFG_DW2(bus, devfn, offset) \ @@ -321,14 +319,31 @@ static void s10_tlp_write_packet(struct altera_pcie *pcie, u32 *headers, s10_tlp_write_tx(pcie, data, RP_TX_EOP); } +static void get_tlp_header(struct altera_pcie *pcie, u8 bus, u32 devfn, + int where, u8 byte_en, bool read, u32 *headers) +{ + u8 cfg; + u8 cfg0 = read ? pcie->pcie_data->cfgrd0 : pcie->pcie_data->cfgwr0; + u8 cfg1 = read ? pcie->pcie_data->cfgrd1 : pcie->pcie_data->cfgwr1; + u8 tag = read ? TLP_READ_TAG : TLP_WRITE_TAG; + + if (pcie->pcie_data->version == ALTERA_PCIE_V1) + cfg = (bus == pcie->root_bus_nr) ? cfg0 : cfg1; + else + cfg = (bus > S10_RP_SECONDARY(pcie)) ? cfg0 : cfg1; + + headers[0] = TLP_CFG_DW0(pcie, cfg); + headers[1] = TLP_CFG_DW1(pcie, tag, byte_en); + headers[2] = TLP_CFG_DW2(bus, devfn, where); +} + static int tlp_cfg_dword_read(struct altera_pcie *pcie, u8 bus, u32 devfn, int where, u8 byte_en, u32 *value) { u32 headers[TLP_HDR_SIZE]; - headers[0] = TLP_CFGRD_DW0(pcie, bus); - headers[1] = TLP_CFG_DW1(pcie, TLP_READ_TAG, byte_en); - headers[2] = TLP_CFG_DW2(bus, devfn, where); + get_tlp_header(pcie, bus, devfn, where, byte_en, true, + headers); pcie->pcie_data->ops->tlp_write_pkt(pcie, headers, 0, false); @@ -341,9 +356,8 @@ static int tlp_cfg_dword_write(struct altera_pcie *pcie, u8 bus, u32 devfn, u32 headers[TLP_HDR_SIZE]; int ret; - headers[0] = TLP_CFGWR_DW0(pcie, bus); - headers[1] = TLP_CFG_DW1(pcie, TLP_WRITE_TAG, byte_en); - headers[2] = TLP_CFG_DW2(bus, devfn, where); + get_tlp_header(pcie, bus, devfn, where, byte_en, false, + headers); /* check alignment to Qword */ if ((where & 0x7) == 0) @@ -705,6 +719,13 @@ static int altera_pcie_init_irq_domain(struct altera_pcie *pcie) return 0; } +static void altera_pcie_irq_teardown(struct altera_pcie *pcie) +{ + irq_set_chained_handler_and_data(pcie->irq, NULL, NULL); + irq_domain_remove(pcie->irq_domain); + irq_dispose_mapping(pcie->irq); +} + static int altera_pcie_parse_dt(struct altera_pcie *pcie) { struct device *dev = &pcie->pdev->dev; @@ -798,6 +819,7 @@ static int altera_pcie_probe(struct platform_device *pdev) pcie = pci_host_bridge_priv(bridge); pcie->pdev = pdev; + platform_set_drvdata(pdev, pcie); match = of_match_device(altera_pcie_of_match, &pdev->dev); if (!match) @@ -855,13 +877,28 @@ static int altera_pcie_probe(struct platform_device *pdev) return ret; } +static int altera_pcie_remove(struct platform_device *pdev) +{ + struct altera_pcie *pcie = platform_get_drvdata(pdev); + struct pci_host_bridge *bridge = pci_host_bridge_from_priv(pcie); + + pci_stop_root_bus(bridge->bus); + pci_remove_root_bus(bridge->bus); + pci_free_resource_list(&pcie->resources); + altera_pcie_irq_teardown(pcie); + + return 0; +} + static struct platform_driver altera_pcie_driver = { .probe = altera_pcie_probe, + .remove = altera_pcie_remove, .driver = { .name = "altera-pcie", .of_match_table = altera_pcie_of_match, - .suppress_bind_attrs = true, }, }; -builtin_platform_driver(altera_pcie_driver); +MODULE_DEVICE_TABLE(of, altera_pcie_of_match); +module_platform_driver(altera_pcie_driver); +MODULE_LICENSE("GPL v2"); diff --git a/drivers/pci/controller/pcie-iproc-platform.c b/drivers/pci/controller/pcie-iproc-platform.c index f30f5f3fb5c1..5a3550b6bb29 100644 --- a/drivers/pci/controller/pcie-iproc-platform.c +++ b/drivers/pci/controller/pcie-iproc-platform.c @@ -87,7 +87,7 @@ static int iproc_pcie_pltfm_probe(struct platform_device *pdev) /* * DT nodes are not used by all platforms that use the iProc PCIe - * core driver. For platforms that require explict inbound mapping + * core driver. For platforms that require explicit inbound mapping * configuration, "dma-ranges" would have been present in DT */ pcie->need_ib_cfg = of_property_read_bool(np, "dma-ranges"); diff --git a/drivers/pci/controller/pcie-iproc.c b/drivers/pci/controller/pcie-iproc.c index e3ca46497470..2d457bfdaf66 100644 --- a/drivers/pci/controller/pcie-iproc.c +++ b/drivers/pci/controller/pcie-iproc.c @@ -163,7 +163,7 @@ enum iproc_pcie_ib_map_type { * @size_unit: inbound mapping region size unit, could be SZ_1K, SZ_1M, or * SZ_1G * @region_sizes: list of supported inbound mapping region sizes in KB, MB, or - * GB, depedning on the size unit + * GB, depending on the size unit * @nr_sizes: number of supported inbound mapping region sizes * @nr_windows: number of supported inbound mapping windows for the region * @imap_addr_offset: register offset between the upper and lower 32-bit diff --git a/drivers/pci/controller/pcie-mobiveil.c b/drivers/pci/controller/pcie-mobiveil.c index 77052a0712d0..672e633601c7 100644 --- a/drivers/pci/controller/pcie-mobiveil.c +++ b/drivers/pci/controller/pcie-mobiveil.c @@ -31,56 +31,61 @@ * translation tables are grouped into windows, each window registers are * grouped into blocks of 4 or 16 registers each */ -#define PAB_REG_BLOCK_SIZE 16 -#define PAB_EXT_REG_BLOCK_SIZE 4 +#define PAB_REG_BLOCK_SIZE 16 +#define PAB_EXT_REG_BLOCK_SIZE 4 -#define PAB_REG_ADDR(offset, win) (offset + (win * PAB_REG_BLOCK_SIZE)) -#define PAB_EXT_REG_ADDR(offset, win) (offset + (win * PAB_EXT_REG_BLOCK_SIZE)) +#define PAB_REG_ADDR(offset, win) \ + (offset + (win * PAB_REG_BLOCK_SIZE)) +#define PAB_EXT_REG_ADDR(offset, win) \ + (offset + (win * PAB_EXT_REG_BLOCK_SIZE)) -#define LTSSM_STATUS 0x0404 -#define LTSSM_STATUS_L0_MASK 0x3f -#define LTSSM_STATUS_L0 0x2d +#define LTSSM_STATUS 0x0404 +#define LTSSM_STATUS_L0_MASK 0x3f +#define LTSSM_STATUS_L0 0x2d -#define PAB_CTRL 0x0808 -#define AMBA_PIO_ENABLE_SHIFT 0 -#define PEX_PIO_ENABLE_SHIFT 1 -#define PAGE_SEL_SHIFT 13 -#define PAGE_SEL_MASK 0x3f -#define PAGE_LO_MASK 0x3ff -#define PAGE_SEL_EN 0xc00 -#define PAGE_SEL_OFFSET_SHIFT 10 +#define PAB_CTRL 0x0808 +#define AMBA_PIO_ENABLE_SHIFT 0 +#define PEX_PIO_ENABLE_SHIFT 1 +#define PAGE_SEL_SHIFT 13 +#define PAGE_SEL_MASK 0x3f +#define PAGE_LO_MASK 0x3ff +#define PAGE_SEL_OFFSET_SHIFT 10 -#define PAB_AXI_PIO_CTRL 0x0840 -#define APIO_EN_MASK 0xf +#define PAB_AXI_PIO_CTRL 0x0840 +#define APIO_EN_MASK 0xf -#define PAB_PEX_PIO_CTRL 0x08c0 -#define PIO_ENABLE_SHIFT 0 +#define PAB_PEX_PIO_CTRL 0x08c0 +#define PIO_ENABLE_SHIFT 0 #define PAB_INTP_AMBA_MISC_ENB 0x0b0c -#define PAB_INTP_AMBA_MISC_STAT 0x0b1c +#define PAB_INTP_AMBA_MISC_STAT 0x0b1c #define PAB_INTP_INTX_MASK 0x01e0 #define PAB_INTP_MSI_MASK 0x8 -#define PAB_AXI_AMAP_CTRL(win) PAB_REG_ADDR(0x0ba0, win) -#define WIN_ENABLE_SHIFT 0 -#define WIN_TYPE_SHIFT 1 +#define PAB_AXI_AMAP_CTRL(win) PAB_REG_ADDR(0x0ba0, win) +#define WIN_ENABLE_SHIFT 0 +#define WIN_TYPE_SHIFT 1 +#define WIN_TYPE_MASK 0x3 +#define WIN_SIZE_MASK 0xfffffc00 #define PAB_EXT_AXI_AMAP_SIZE(win) PAB_EXT_REG_ADDR(0xbaf0, win) +#define PAB_EXT_AXI_AMAP_AXI_WIN(win) PAB_EXT_REG_ADDR(0x80a0, win) #define PAB_AXI_AMAP_AXI_WIN(win) PAB_REG_ADDR(0x0ba4, win) #define AXI_WINDOW_ALIGN_MASK 3 #define PAB_AXI_AMAP_PEX_WIN_L(win) PAB_REG_ADDR(0x0ba8, win) -#define PAB_BUS_SHIFT 24 -#define PAB_DEVICE_SHIFT 19 -#define PAB_FUNCTION_SHIFT 16 +#define PAB_BUS_SHIFT 24 +#define PAB_DEVICE_SHIFT 19 +#define PAB_FUNCTION_SHIFT 16 #define PAB_AXI_AMAP_PEX_WIN_H(win) PAB_REG_ADDR(0x0bac, win) #define PAB_INTP_AXI_PIO_CLASS 0x474 -#define PAB_PEX_AMAP_CTRL(win) PAB_REG_ADDR(0x4ba0, win) -#define AMAP_CTRL_EN_SHIFT 0 -#define AMAP_CTRL_TYPE_SHIFT 1 +#define PAB_PEX_AMAP_CTRL(win) PAB_REG_ADDR(0x4ba0, win) +#define AMAP_CTRL_EN_SHIFT 0 +#define AMAP_CTRL_TYPE_SHIFT 1 +#define AMAP_CTRL_TYPE_MASK 3 #define PAB_EXT_PEX_AMAP_SIZEN(win) PAB_EXT_REG_ADDR(0xbef0, win) #define PAB_PEX_AMAP_AXI_WIN(win) PAB_REG_ADDR(0x4ba4, win) @@ -88,34 +93,40 @@ #define PAB_PEX_AMAP_PEX_WIN_H(win) PAB_REG_ADDR(0x4bac, win) /* starting offset of INTX bits in status register */ -#define PAB_INTX_START 5 +#define PAB_INTX_START 5 /* supported number of MSI interrupts */ -#define PCI_NUM_MSI 16 +#define PCI_NUM_MSI 16 /* MSI registers */ -#define MSI_BASE_LO_OFFSET 0x04 -#define MSI_BASE_HI_OFFSET 0x08 -#define MSI_SIZE_OFFSET 0x0c -#define MSI_ENABLE_OFFSET 0x14 -#define MSI_STATUS_OFFSET 0x18 -#define MSI_DATA_OFFSET 0x20 -#define MSI_ADDR_L_OFFSET 0x24 -#define MSI_ADDR_H_OFFSET 0x28 +#define MSI_BASE_LO_OFFSET 0x04 +#define MSI_BASE_HI_OFFSET 0x08 +#define MSI_SIZE_OFFSET 0x0c +#define MSI_ENABLE_OFFSET 0x14 +#define MSI_STATUS_OFFSET 0x18 +#define MSI_DATA_OFFSET 0x20 +#define MSI_ADDR_L_OFFSET 0x24 +#define MSI_ADDR_H_OFFSET 0x28 /* outbound and inbound window definitions */ -#define WIN_NUM_0 0 -#define WIN_NUM_1 1 -#define CFG_WINDOW_TYPE 0 -#define IO_WINDOW_TYPE 1 -#define MEM_WINDOW_TYPE 2 -#define IB_WIN_SIZE ((u64)256 * 1024 * 1024 * 1024) -#define MAX_PIO_WINDOWS 8 +#define WIN_NUM_0 0 +#define WIN_NUM_1 1 +#define CFG_WINDOW_TYPE 0 +#define IO_WINDOW_TYPE 1 +#define MEM_WINDOW_TYPE 2 +#define IB_WIN_SIZE ((u64)256 * 1024 * 1024 * 1024) +#define MAX_PIO_WINDOWS 8 /* Parameters for the waiting for link up routine */ -#define LINK_WAIT_MAX_RETRIES 10 -#define LINK_WAIT_MIN 90000 -#define LINK_WAIT_MAX 100000 +#define LINK_WAIT_MAX_RETRIES 10 +#define LINK_WAIT_MIN 90000 +#define LINK_WAIT_MAX 100000 + +#define PAGED_ADDR_BNDRY 0xc00 +#define OFFSET_TO_PAGE_ADDR(off) \ + ((off & PAGE_LO_MASK) | PAGED_ADDR_BNDRY) +#define OFFSET_TO_PAGE_IDX(off) \ + ((off >> PAGE_SEL_OFFSET_SHIFT) & PAGE_SEL_MASK) struct mobiveil_msi { /* MSI information */ struct mutex lock; /* protect bitmap variable */ @@ -145,15 +156,119 @@ struct mobiveil_pcie { struct mobiveil_msi msi; }; -static inline void csr_writel(struct mobiveil_pcie *pcie, const u32 value, - const u32 reg) +/* + * mobiveil_pcie_sel_page - routine to access paged register + * + * Registers whose address greater than PAGED_ADDR_BNDRY (0xc00) are paged, + * for this scheme to work extracted higher 6 bits of the offset will be + * written to pg_sel field of PAB_CTRL register and rest of the lower 10 + * bits enabled with PAGED_ADDR_BNDRY are used as offset of the register. + */ +static void mobiveil_pcie_sel_page(struct mobiveil_pcie *pcie, u8 pg_idx) +{ + u32 val; + + val = readl(pcie->csr_axi_slave_base + PAB_CTRL); + val &= ~(PAGE_SEL_MASK << PAGE_SEL_SHIFT); + val |= (pg_idx & PAGE_SEL_MASK) << PAGE_SEL_SHIFT; + + writel(val, pcie->csr_axi_slave_base + PAB_CTRL); +} + +static void *mobiveil_pcie_comp_addr(struct mobiveil_pcie *pcie, u32 off) +{ + if (off < PAGED_ADDR_BNDRY) { + /* For directly accessed registers, clear the pg_sel field */ + mobiveil_pcie_sel_page(pcie, 0); + return pcie->csr_axi_slave_base + off; + } + + mobiveil_pcie_sel_page(pcie, OFFSET_TO_PAGE_IDX(off)); + return pcie->csr_axi_slave_base + OFFSET_TO_PAGE_ADDR(off); +} + +static int mobiveil_pcie_read(void __iomem *addr, int size, u32 *val) { - writel_relaxed(value, pcie->csr_axi_slave_base + reg); + if ((uintptr_t)addr & (size - 1)) { + *val = 0; + return PCIBIOS_BAD_REGISTER_NUMBER; + } + + switch (size) { + case 4: + *val = readl(addr); + break; + case 2: + *val = readw(addr); + break; + case 1: + *val = readb(addr); + break; + default: + *val = 0; + return PCIBIOS_BAD_REGISTER_NUMBER; + } + + return PCIBIOS_SUCCESSFUL; } -static inline u32 csr_readl(struct mobiveil_pcie *pcie, const u32 reg) +static int mobiveil_pcie_write(void __iomem *addr, int size, u32 val) { - return readl_relaxed(pcie->csr_axi_slave_base + reg); + if ((uintptr_t)addr & (size - 1)) + return PCIBIOS_BAD_REGISTER_NUMBER; + + switch (size) { + case 4: + writel(val, addr); + break; + case 2: + writew(val, addr); + break; + case 1: + writeb(val, addr); + break; + default: + return PCIBIOS_BAD_REGISTER_NUMBER; + } + + return PCIBIOS_SUCCESSFUL; +} + +static u32 csr_read(struct mobiveil_pcie *pcie, u32 off, size_t size) +{ + void *addr; + u32 val; + int ret; + + addr = mobiveil_pcie_comp_addr(pcie, off); + + ret = mobiveil_pcie_read(addr, size, &val); + if (ret) + dev_err(&pcie->pdev->dev, "read CSR address failed\n"); + + return val; +} + +static void csr_write(struct mobiveil_pcie *pcie, u32 val, u32 off, size_t size) +{ + void *addr; + int ret; + + addr = mobiveil_pcie_comp_addr(pcie, off); + + ret = mobiveil_pcie_write(addr, size, val); + if (ret) + dev_err(&pcie->pdev->dev, "write CSR address failed\n"); +} + +static u32 csr_readl(struct mobiveil_pcie *pcie, u32 off) +{ + return csr_read(pcie, off, 0x4); +} + +static void csr_writel(struct mobiveil_pcie *pcie, u32 val, u32 off) +{ + csr_write(pcie, val, off, 0x4); } static bool mobiveil_pcie_link_up(struct mobiveil_pcie *pcie) @@ -174,7 +289,7 @@ static bool mobiveil_pcie_valid_device(struct pci_bus *bus, unsigned int devfn) * Do not read more than one device on the bus directly * attached to RC */ - if ((bus->primary == pcie->root_bus_nr) && (devfn > 0)) + if ((bus->primary == pcie->root_bus_nr) && (PCI_SLOT(devfn) > 0)) return false; return true; @@ -185,17 +300,17 @@ static bool mobiveil_pcie_valid_device(struct pci_bus *bus, unsigned int devfn) * root port or endpoint */ static void __iomem *mobiveil_pcie_map_bus(struct pci_bus *bus, - unsigned int devfn, int where) + unsigned int devfn, int where) { struct mobiveil_pcie *pcie = bus->sysdata; + u32 value; if (!mobiveil_pcie_valid_device(bus, devfn)) return NULL; - if (bus->number == pcie->root_bus_nr) { - /* RC config access */ + /* RC config access */ + if (bus->number == pcie->root_bus_nr) return pcie->csr_axi_slave_base + where; - } /* * EP config access (in Config/APIO space) @@ -203,10 +318,12 @@ static void __iomem *mobiveil_pcie_map_bus(struct pci_bus *bus, * (BDF) in PAB_AXI_AMAP_PEX_WIN_L0 Register. * Relies on pci_lock serialization */ - csr_writel(pcie, bus->number << PAB_BUS_SHIFT | - PCI_SLOT(devfn) << PAB_DEVICE_SHIFT | - PCI_FUNC(devfn) << PAB_FUNCTION_SHIFT, - PAB_AXI_AMAP_PEX_WIN_L(WIN_NUM_0)); + value = bus->number << PAB_BUS_SHIFT | + PCI_SLOT(devfn) << PAB_DEVICE_SHIFT | + PCI_FUNC(devfn) << PAB_FUNCTION_SHIFT; + + csr_writel(pcie, value, PAB_AXI_AMAP_PEX_WIN_L(WIN_NUM_0)); + return pcie->config_axi_slave_base + where; } @@ -241,24 +358,29 @@ static void mobiveil_pcie_isr(struct irq_desc *desc) /* Handle INTx */ if (intr_status & PAB_INTP_INTX_MASK) { - shifted_status = csr_readl(pcie, PAB_INTP_AMBA_MISC_STAT) >> - PAB_INTX_START; + shifted_status = csr_readl(pcie, PAB_INTP_AMBA_MISC_STAT); + shifted_status &= PAB_INTP_INTX_MASK; + shifted_status >>= PAB_INTX_START; do { for_each_set_bit(bit, &shifted_status, PCI_NUM_INTX) { virq = irq_find_mapping(pcie->intx_domain, - bit + 1); + bit + 1); if (virq) generic_handle_irq(virq); else - dev_err_ratelimited(dev, - "unexpected IRQ, INT%d\n", bit); + dev_err_ratelimited(dev, "unexpected IRQ, INT%d\n", + bit); - /* clear interrupt */ - csr_writel(pcie, - shifted_status << PAB_INTX_START, - PAB_INTP_AMBA_MISC_STAT); + /* clear interrupt handled */ + csr_writel(pcie, 1 << (PAB_INTX_START + bit), + PAB_INTP_AMBA_MISC_STAT); } - } while ((shifted_status >> PAB_INTX_START) != 0); + + shifted_status = csr_readl(pcie, + PAB_INTP_AMBA_MISC_STAT); + shifted_status &= PAB_INTP_INTX_MASK; + shifted_status >>= PAB_INTX_START; + } while (shifted_status != 0); } /* read extra MSI status register */ @@ -266,8 +388,7 @@ static void mobiveil_pcie_isr(struct irq_desc *desc) /* handle MSI interrupts */ while (msi_status & 1) { - msi_data = readl_relaxed(pcie->apb_csr_base - + MSI_DATA_OFFSET); + msi_data = readl_relaxed(pcie->apb_csr_base + MSI_DATA_OFFSET); /* * MSI_STATUS_OFFSET register gets updated to zero @@ -276,18 +397,18 @@ static void mobiveil_pcie_isr(struct irq_desc *desc) * two dummy reads. */ msi_addr_lo = readl_relaxed(pcie->apb_csr_base + - MSI_ADDR_L_OFFSET); + MSI_ADDR_L_OFFSET); msi_addr_hi = readl_relaxed(pcie->apb_csr_base + - MSI_ADDR_H_OFFSET); + MSI_ADDR_H_OFFSET); dev_dbg(dev, "MSI registers, data: %08x, addr: %08x:%08x\n", - msi_data, msi_addr_hi, msi_addr_lo); + msi_data, msi_addr_hi, msi_addr_lo); virq = irq_find_mapping(msi->dev_domain, msi_data); if (virq) generic_handle_irq(virq); msi_status = readl_relaxed(pcie->apb_csr_base + - MSI_STATUS_OFFSET); + MSI_STATUS_OFFSET); } /* Clear the interrupt status */ @@ -304,7 +425,7 @@ static int mobiveil_pcie_parse_dt(struct mobiveil_pcie *pcie) /* map config resource */ res = platform_get_resource_byname(pdev, IORESOURCE_MEM, - "config_axi_slave"); + "config_axi_slave"); pcie->config_axi_slave_base = devm_pci_remap_cfg_resource(dev, res); if (IS_ERR(pcie->config_axi_slave_base)) return PTR_ERR(pcie->config_axi_slave_base); @@ -312,7 +433,7 @@ static int mobiveil_pcie_parse_dt(struct mobiveil_pcie *pcie) /* map csr resource */ res = platform_get_resource_byname(pdev, IORESOURCE_MEM, - "csr_axi_slave"); + "csr_axi_slave"); pcie->csr_axi_slave_base = devm_pci_remap_cfg_resource(dev, res); if (IS_ERR(pcie->csr_axi_slave_base)) return PTR_ERR(pcie->csr_axi_slave_base); @@ -337,92 +458,50 @@ static int mobiveil_pcie_parse_dt(struct mobiveil_pcie *pcie) return -ENODEV; } - irq_set_chained_handler_and_data(pcie->irq, mobiveil_pcie_isr, pcie); - return 0; } -/* - * select_paged_register - routine to access paged register of root complex - * - * registers of RC are paged, for this scheme to work - * extracted higher 6 bits of the offset will be written to pg_sel - * field of PAB_CTRL register and rest of the lower 10 bits enabled with - * PAGE_SEL_EN are used as offset of the register. - */ -static void select_paged_register(struct mobiveil_pcie *pcie, u32 offset) -{ - int pab_ctrl_dw, pg_sel; - - /* clear pg_sel field */ - pab_ctrl_dw = csr_readl(pcie, PAB_CTRL); - pab_ctrl_dw = (pab_ctrl_dw & ~(PAGE_SEL_MASK << PAGE_SEL_SHIFT)); - - /* set pg_sel field */ - pg_sel = (offset >> PAGE_SEL_OFFSET_SHIFT) & PAGE_SEL_MASK; - pab_ctrl_dw |= ((pg_sel << PAGE_SEL_SHIFT)); - csr_writel(pcie, pab_ctrl_dw, PAB_CTRL); -} - -static void write_paged_register(struct mobiveil_pcie *pcie, - u32 val, u32 offset) -{ - u32 off = (offset & PAGE_LO_MASK) | PAGE_SEL_EN; - - select_paged_register(pcie, offset); - csr_writel(pcie, val, off); -} - -static u32 read_paged_register(struct mobiveil_pcie *pcie, u32 offset) -{ - u32 off = (offset & PAGE_LO_MASK) | PAGE_SEL_EN; - - select_paged_register(pcie, offset); - return csr_readl(pcie, off); -} - static void program_ib_windows(struct mobiveil_pcie *pcie, int win_num, - int pci_addr, u32 type, u64 size) + u64 pci_addr, u32 type, u64 size) { - int pio_ctrl_val; - int amap_ctrl_dw; + u32 value; u64 size64 = ~(size - 1); - if ((pcie->ib_wins_configured + 1) > pcie->ppio_wins) { + if (win_num >= pcie->ppio_wins) { dev_err(&pcie->pdev->dev, "ERROR: max inbound windows reached !\n"); return; } - pio_ctrl_val = csr_readl(pcie, PAB_PEX_PIO_CTRL); - csr_writel(pcie, - pio_ctrl_val | (1 << PIO_ENABLE_SHIFT), PAB_PEX_PIO_CTRL); - amap_ctrl_dw = read_paged_register(pcie, PAB_PEX_AMAP_CTRL(win_num)); - amap_ctrl_dw = (amap_ctrl_dw | (type << AMAP_CTRL_TYPE_SHIFT)); - amap_ctrl_dw = (amap_ctrl_dw | (1 << AMAP_CTRL_EN_SHIFT)); + value = csr_readl(pcie, PAB_PEX_AMAP_CTRL(win_num)); + value &= ~(AMAP_CTRL_TYPE_MASK << AMAP_CTRL_TYPE_SHIFT | WIN_SIZE_MASK); + value |= type << AMAP_CTRL_TYPE_SHIFT | 1 << AMAP_CTRL_EN_SHIFT | + (lower_32_bits(size64) & WIN_SIZE_MASK); + csr_writel(pcie, value, PAB_PEX_AMAP_CTRL(win_num)); + + csr_writel(pcie, upper_32_bits(size64), + PAB_EXT_PEX_AMAP_SIZEN(win_num)); - write_paged_register(pcie, amap_ctrl_dw | lower_32_bits(size64), - PAB_PEX_AMAP_CTRL(win_num)); + csr_writel(pcie, pci_addr, PAB_PEX_AMAP_AXI_WIN(win_num)); - write_paged_register(pcie, upper_32_bits(size64), - PAB_EXT_PEX_AMAP_SIZEN(win_num)); + csr_writel(pcie, lower_32_bits(pci_addr), + PAB_PEX_AMAP_PEX_WIN_L(win_num)); + csr_writel(pcie, upper_32_bits(pci_addr), + PAB_PEX_AMAP_PEX_WIN_H(win_num)); - write_paged_register(pcie, pci_addr, PAB_PEX_AMAP_AXI_WIN(win_num)); - write_paged_register(pcie, pci_addr, PAB_PEX_AMAP_PEX_WIN_L(win_num)); - write_paged_register(pcie, 0, PAB_PEX_AMAP_PEX_WIN_H(win_num)); + pcie->ib_wins_configured++; } /* * routine to program the outbound windows */ static void program_ob_windows(struct mobiveil_pcie *pcie, int win_num, - u64 cpu_addr, u64 pci_addr, u32 config_io_bit, u64 size) + u64 cpu_addr, u64 pci_addr, u32 type, u64 size) { - - u32 value, type; + u32 value; u64 size64 = ~(size - 1); - if ((pcie->ob_wins_configured + 1) > pcie->apio_wins) { + if (win_num >= pcie->apio_wins) { dev_err(&pcie->pdev->dev, "ERROR: max outbound windows reached !\n"); return; @@ -432,28 +511,27 @@ static void program_ob_windows(struct mobiveil_pcie *pcie, int win_num, * program Enable Bit to 1, Type Bit to (00) base 2, AXI Window Size Bit * to 4 KB in PAB_AXI_AMAP_CTRL register */ - type = config_io_bit; value = csr_readl(pcie, PAB_AXI_AMAP_CTRL(win_num)); - csr_writel(pcie, 1 << WIN_ENABLE_SHIFT | type << WIN_TYPE_SHIFT | - lower_32_bits(size64), PAB_AXI_AMAP_CTRL(win_num)); + value &= ~(WIN_TYPE_MASK << WIN_TYPE_SHIFT | WIN_SIZE_MASK); + value |= 1 << WIN_ENABLE_SHIFT | type << WIN_TYPE_SHIFT | + (lower_32_bits(size64) & WIN_SIZE_MASK); + csr_writel(pcie, value, PAB_AXI_AMAP_CTRL(win_num)); - write_paged_register(pcie, upper_32_bits(size64), - PAB_EXT_AXI_AMAP_SIZE(win_num)); + csr_writel(pcie, upper_32_bits(size64), PAB_EXT_AXI_AMAP_SIZE(win_num)); /* * program AXI window base with appropriate value in * PAB_AXI_AMAP_AXI_WIN0 register */ - value = csr_readl(pcie, PAB_AXI_AMAP_AXI_WIN(win_num)); - csr_writel(pcie, cpu_addr & (~AXI_WINDOW_ALIGN_MASK), - PAB_AXI_AMAP_AXI_WIN(win_num)); - - value = csr_readl(pcie, PAB_AXI_AMAP_PEX_WIN_H(win_num)); + csr_writel(pcie, lower_32_bits(cpu_addr) & (~AXI_WINDOW_ALIGN_MASK), + PAB_AXI_AMAP_AXI_WIN(win_num)); + csr_writel(pcie, upper_32_bits(cpu_addr), + PAB_EXT_AXI_AMAP_AXI_WIN(win_num)); csr_writel(pcie, lower_32_bits(pci_addr), - PAB_AXI_AMAP_PEX_WIN_L(win_num)); + PAB_AXI_AMAP_PEX_WIN_L(win_num)); csr_writel(pcie, upper_32_bits(pci_addr), - PAB_AXI_AMAP_PEX_WIN_H(win_num)); + PAB_AXI_AMAP_PEX_WIN_H(win_num)); pcie->ob_wins_configured++; } @@ -469,7 +547,9 @@ static int mobiveil_bringup_link(struct mobiveil_pcie *pcie) usleep_range(LINK_WAIT_MIN, LINK_WAIT_MAX); } + dev_err(&pcie->pdev->dev, "link never came up\n"); + return -ETIMEDOUT; } @@ -482,50 +562,55 @@ static void mobiveil_pcie_enable_msi(struct mobiveil_pcie *pcie) msi->msi_pages_phys = (phys_addr_t)msg_addr; writel_relaxed(lower_32_bits(msg_addr), - pcie->apb_csr_base + MSI_BASE_LO_OFFSET); + pcie->apb_csr_base + MSI_BASE_LO_OFFSET); writel_relaxed(upper_32_bits(msg_addr), - pcie->apb_csr_base + MSI_BASE_HI_OFFSET); + pcie->apb_csr_base + MSI_BASE_HI_OFFSET); writel_relaxed(4096, pcie->apb_csr_base + MSI_SIZE_OFFSET); writel_relaxed(1, pcie->apb_csr_base + MSI_ENABLE_OFFSET); } static int mobiveil_host_init(struct mobiveil_pcie *pcie) { - u32 value, pab_ctrl, type = 0; - int err; - struct resource_entry *win, *tmp; - - err = mobiveil_bringup_link(pcie); - if (err) { - dev_info(&pcie->pdev->dev, "link bring-up failed\n"); - return err; - } + u32 value, pab_ctrl, type; + struct resource_entry *win; + + /* setup bus numbers */ + value = csr_readl(pcie, PCI_PRIMARY_BUS); + value &= 0xff000000; + value |= 0x00ff0100; + csr_writel(pcie, value, PCI_PRIMARY_BUS); /* * program Bus Master Enable Bit in Command Register in PAB Config * Space */ value = csr_readl(pcie, PCI_COMMAND); - csr_writel(pcie, value | PCI_COMMAND_IO | PCI_COMMAND_MEMORY | - PCI_COMMAND_MASTER, PCI_COMMAND); + value |= PCI_COMMAND_IO | PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER; + csr_writel(pcie, value, PCI_COMMAND); /* * program PIO Enable Bit to 1 (and PEX PIO Enable to 1) in PAB_CTRL * register */ pab_ctrl = csr_readl(pcie, PAB_CTRL); - csr_writel(pcie, pab_ctrl | (1 << AMBA_PIO_ENABLE_SHIFT) | - (1 << PEX_PIO_ENABLE_SHIFT), PAB_CTRL); + pab_ctrl |= (1 << AMBA_PIO_ENABLE_SHIFT) | (1 << PEX_PIO_ENABLE_SHIFT); + csr_writel(pcie, pab_ctrl, PAB_CTRL); csr_writel(pcie, (PAB_INTP_INTX_MASK | PAB_INTP_MSI_MASK), - PAB_INTP_AMBA_MISC_ENB); + PAB_INTP_AMBA_MISC_ENB); /* * program PIO Enable Bit to 1 and Config Window Enable Bit to 1 in * PAB_AXI_PIO_CTRL Register */ value = csr_readl(pcie, PAB_AXI_PIO_CTRL); - csr_writel(pcie, value | APIO_EN_MASK, PAB_AXI_PIO_CTRL); + value |= APIO_EN_MASK; + csr_writel(pcie, value, PAB_AXI_PIO_CTRL); + + /* Enable PCIe PIO master */ + value = csr_readl(pcie, PAB_PEX_PIO_CTRL); + value |= 1 << PIO_ENABLE_SHIFT; + csr_writel(pcie, value, PAB_PEX_PIO_CTRL); /* * we'll program one outbound window for config reads and @@ -535,32 +620,38 @@ static int mobiveil_host_init(struct mobiveil_pcie *pcie) */ /* config outbound translation window */ - program_ob_windows(pcie, pcie->ob_wins_configured, - pcie->ob_io_res->start, 0, CFG_WINDOW_TYPE, - resource_size(pcie->ob_io_res)); + program_ob_windows(pcie, WIN_NUM_0, pcie->ob_io_res->start, 0, + CFG_WINDOW_TYPE, resource_size(pcie->ob_io_res)); /* memory inbound translation window */ - program_ib_windows(pcie, WIN_NUM_1, 0, MEM_WINDOW_TYPE, IB_WIN_SIZE); + program_ib_windows(pcie, WIN_NUM_0, 0, MEM_WINDOW_TYPE, IB_WIN_SIZE); /* Get the I/O and memory ranges from DT */ - resource_list_for_each_entry_safe(win, tmp, &pcie->resources) { - type = 0; + resource_list_for_each_entry(win, &pcie->resources) { if (resource_type(win->res) == IORESOURCE_MEM) type = MEM_WINDOW_TYPE; - if (resource_type(win->res) == IORESOURCE_IO) + else if (resource_type(win->res) == IORESOURCE_IO) type = IO_WINDOW_TYPE; - if (type) { - /* configure outbound translation window */ - program_ob_windows(pcie, pcie->ob_wins_configured, - win->res->start, 0, type, - resource_size(win->res)); - } + else + continue; + + /* configure outbound translation window */ + program_ob_windows(pcie, pcie->ob_wins_configured, + win->res->start, + win->res->start - win->offset, + type, resource_size(win->res)); } + /* fixup for PCIe class register */ + value = csr_readl(pcie, PAB_INTP_AXI_PIO_CLASS); + value &= 0xff; + value |= (PCI_CLASS_BRIDGE_PCI << 16); + csr_writel(pcie, value, PAB_INTP_AXI_PIO_CLASS); + /* setup MSI hardware registers */ mobiveil_pcie_enable_msi(pcie); - return err; + return 0; } static void mobiveil_mask_intx_irq(struct irq_data *data) @@ -574,7 +665,8 @@ static void mobiveil_mask_intx_irq(struct irq_data *data) mask = 1 << ((data->hwirq + PAB_INTX_START) - 1); raw_spin_lock_irqsave(&pcie->intx_mask_lock, flags); shifted_val = csr_readl(pcie, PAB_INTP_AMBA_MISC_ENB); - csr_writel(pcie, (shifted_val & (~mask)), PAB_INTP_AMBA_MISC_ENB); + shifted_val &= ~mask; + csr_writel(pcie, shifted_val, PAB_INTP_AMBA_MISC_ENB); raw_spin_unlock_irqrestore(&pcie->intx_mask_lock, flags); } @@ -589,7 +681,8 @@ static void mobiveil_unmask_intx_irq(struct irq_data *data) mask = 1 << ((data->hwirq + PAB_INTX_START) - 1); raw_spin_lock_irqsave(&pcie->intx_mask_lock, flags); shifted_val = csr_readl(pcie, PAB_INTP_AMBA_MISC_ENB); - csr_writel(pcie, (shifted_val | mask), PAB_INTP_AMBA_MISC_ENB); + shifted_val |= mask; + csr_writel(pcie, shifted_val, PAB_INTP_AMBA_MISC_ENB); raw_spin_unlock_irqrestore(&pcie->intx_mask_lock, flags); } @@ -603,10 +696,11 @@ static struct irq_chip intx_irq_chip = { /* routine to setup the INTx related data */ static int mobiveil_pcie_intx_map(struct irq_domain *domain, unsigned int irq, - irq_hw_number_t hwirq) + irq_hw_number_t hwirq) { irq_set_chip_and_handler(irq, &intx_irq_chip, handle_level_irq); irq_set_chip_data(irq, domain->host_data); + return 0; } @@ -623,7 +717,7 @@ static struct irq_chip mobiveil_msi_irq_chip = { static struct msi_domain_info mobiveil_msi_domain_info = { .flags = (MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS | - MSI_FLAG_MULTI_PCI_MSI | MSI_FLAG_PCI_MSIX), + MSI_FLAG_PCI_MSIX), .chip = &mobiveil_msi_irq_chip, }; @@ -641,7 +735,7 @@ static void mobiveil_compose_msi_msg(struct irq_data *data, struct msi_msg *msg) } static int mobiveil_msi_set_affinity(struct irq_data *irq_data, - const struct cpumask *mask, bool force) + const struct cpumask *mask, bool force) { return -EINVAL; } @@ -653,7 +747,8 @@ static struct irq_chip mobiveil_msi_bottom_irq_chip = { }; static int mobiveil_irq_msi_domain_alloc(struct irq_domain *domain, - unsigned int virq, unsigned int nr_irqs, void *args) + unsigned int virq, + unsigned int nr_irqs, void *args) { struct mobiveil_pcie *pcie = domain->host_data; struct mobiveil_msi *msi = &pcie->msi; @@ -673,13 +768,13 @@ static int mobiveil_irq_msi_domain_alloc(struct irq_domain *domain, mutex_unlock(&msi->lock); irq_domain_set_info(domain, virq, bit, &mobiveil_msi_bottom_irq_chip, - domain->host_data, handle_level_irq, - NULL, NULL); + domain->host_data, handle_level_irq, NULL, NULL); return 0; } static void mobiveil_irq_msi_domain_free(struct irq_domain *domain, - unsigned int virq, unsigned int nr_irqs) + unsigned int virq, + unsigned int nr_irqs) { struct irq_data *d = irq_domain_get_irq_data(domain, virq); struct mobiveil_pcie *pcie = irq_data_get_irq_chip_data(d); @@ -687,12 +782,11 @@ static void mobiveil_irq_msi_domain_free(struct irq_domain *domain, mutex_lock(&msi->lock); - if (!test_bit(d->hwirq, msi->msi_irq_in_use)) { + if (!test_bit(d->hwirq, msi->msi_irq_in_use)) dev_err(&pcie->pdev->dev, "trying to free unused MSI#%lu\n", d->hwirq); - } else { + else __clear_bit(d->hwirq, msi->msi_irq_in_use); - } mutex_unlock(&msi->lock); } @@ -716,12 +810,14 @@ static int mobiveil_allocate_msi_domains(struct mobiveil_pcie *pcie) } msi->msi_domain = pci_msi_create_irq_domain(fwnode, - &mobiveil_msi_domain_info, msi->dev_domain); + &mobiveil_msi_domain_info, + msi->dev_domain); if (!msi->msi_domain) { dev_err(dev, "failed to create MSI domain\n"); irq_domain_remove(msi->dev_domain); return -ENOMEM; } + return 0; } @@ -732,12 +828,12 @@ static int mobiveil_pcie_init_irq_domain(struct mobiveil_pcie *pcie) int ret; /* setup INTx */ - pcie->intx_domain = irq_domain_add_linear(node, - PCI_NUM_INTX, &intx_domain_ops, pcie); + pcie->intx_domain = irq_domain_add_linear(node, PCI_NUM_INTX, + &intx_domain_ops, pcie); if (!pcie->intx_domain) { dev_err(dev, "Failed to get a INTx IRQ domain\n"); - return -ENODEV; + return -ENOMEM; } raw_spin_lock_init(&pcie->intx_mask_lock); @@ -763,11 +859,9 @@ static int mobiveil_pcie_probe(struct platform_device *pdev) /* allocate the PCIe port */ bridge = devm_pci_alloc_host_bridge(dev, sizeof(*pcie)); if (!bridge) - return -ENODEV; + return -ENOMEM; pcie = pci_host_bridge_priv(bridge); - if (!pcie) - return -ENOMEM; pcie->pdev = pdev; @@ -784,7 +878,7 @@ static int mobiveil_pcie_probe(struct platform_device *pdev) &pcie->resources, &iobase); if (ret) { dev_err(dev, "Getting bridge resources failed\n"); - return -ENOMEM; + return ret; } /* @@ -797,9 +891,6 @@ static int mobiveil_pcie_probe(struct platform_device *pdev) goto error; } - /* fixup for PCIe class register */ - csr_writel(pcie, 0x060402ab, PAB_INTP_AXI_PIO_CLASS); - /* initialize the IRQ domains */ ret = mobiveil_pcie_init_irq_domain(pcie); if (ret) { @@ -807,6 +898,8 @@ static int mobiveil_pcie_probe(struct platform_device *pdev) goto error; } + irq_set_chained_handler_and_data(pcie->irq, mobiveil_pcie_isr, pcie); + ret = devm_request_pci_bus_resources(dev, &pcie->resources); if (ret) goto error; @@ -820,6 +913,12 @@ static int mobiveil_pcie_probe(struct platform_device *pdev) bridge->map_irq = of_irq_parse_and_map_pci; bridge->swizzle_irq = pci_common_swizzle; + ret = mobiveil_bringup_link(pcie); + if (ret) { + dev_info(dev, "link bring-up failed\n"); + goto error; + } + /* setup the kernel resources for the newly added PCIe root bus */ ret = pci_scan_root_bus_bridge(bridge); if (ret) @@ -848,10 +947,10 @@ MODULE_DEVICE_TABLE(of, mobiveil_pcie_of_match); static struct platform_driver mobiveil_pcie_driver = { .probe = mobiveil_pcie_probe, .driver = { - .name = "mobiveil-pcie", - .of_match_table = mobiveil_pcie_of_match, - .suppress_bind_attrs = true, - }, + .name = "mobiveil-pcie", + .of_match_table = mobiveil_pcie_of_match, + .suppress_bind_attrs = true, + }, }; builtin_platform_driver(mobiveil_pcie_driver); diff --git a/drivers/pci/controller/pcie-xilinx-nwl.c b/drivers/pci/controller/pcie-xilinx-nwl.c index 3b031f00a94a..45c0f344ccd1 100644 --- a/drivers/pci/controller/pcie-xilinx-nwl.c +++ b/drivers/pci/controller/pcie-xilinx-nwl.c @@ -482,15 +482,13 @@ static int nwl_irq_domain_alloc(struct irq_domain *domain, unsigned int virq, int i; mutex_lock(&msi->lock); - bit = bitmap_find_next_zero_area(msi->bitmap, INT_PCI_MSI_NR, 0, - nr_irqs, 0); - if (bit >= INT_PCI_MSI_NR) { + bit = bitmap_find_free_region(msi->bitmap, INT_PCI_MSI_NR, + get_count_order(nr_irqs)); + if (bit < 0) { mutex_unlock(&msi->lock); return -ENOSPC; } - bitmap_set(msi->bitmap, bit, nr_irqs); - for (i = 0; i < nr_irqs; i++) { irq_domain_set_info(domain, virq + i, bit + i, &nwl_irq_chip, domain->host_data, handle_simple_irq, @@ -508,7 +506,8 @@ static void nwl_irq_domain_free(struct irq_domain *domain, unsigned int virq, struct nwl_msi *msi = &pcie->msi; mutex_lock(&msi->lock); - bitmap_clear(msi->bitmap, data->hwirq, nr_irqs); + bitmap_release_region(msi->bitmap, data->hwirq, + get_count_order(nr_irqs)); mutex_unlock(&msi->lock); } diff --git a/drivers/pci/controller/vmd.c b/drivers/pci/controller/vmd.c index 999a5509e57e..4575e0c6dc4b 100644 --- a/drivers/pci/controller/vmd.c +++ b/drivers/pci/controller/vmd.c @@ -627,7 +627,7 @@ static int vmd_enable_domain(struct vmd_dev *vmd, unsigned long features) * 32-bit resources. __pci_assign_resource() enforces that * artificial restriction to make sure everything will fit. * - * The only way we could use a 64-bit non-prefechable MEMBAR is + * The only way we could use a 64-bit non-prefetchable MEMBAR is * if its address is <4GB so that we can convert it to a 32-bit * resource. To be visible to the host OS, all VMD endpoints must * be initially configured by platform BIOS, which includes setting diff --git a/drivers/pci/endpoint/functions/pci-epf-test.c b/drivers/pci/endpoint/functions/pci-epf-test.c index 27806987e93b..1cfe3687a211 100644 --- a/drivers/pci/endpoint/functions/pci-epf-test.c +++ b/drivers/pci/endpoint/functions/pci-epf-test.c @@ -381,15 +381,15 @@ static void pci_epf_test_unbind(struct pci_epf *epf) epf_bar = &epf->bar[bar]; if (epf_test->reg[bar]) { - pci_epf_free_space(epf, epf_test->reg[bar], bar); pci_epc_clear_bar(epc, epf->func_no, epf_bar); + pci_epf_free_space(epf, epf_test->reg[bar], bar); } } } static int pci_epf_test_set_bar(struct pci_epf *epf) { - int bar; + int bar, add; int ret; struct pci_epf_bar *epf_bar; struct pci_epc *epc = epf->epc; @@ -400,8 +400,14 @@ static int pci_epf_test_set_bar(struct pci_epf *epf) epc_features = epf_test->epc_features; - for (bar = BAR_0; bar <= BAR_5; bar++) { + for (bar = BAR_0; bar <= BAR_5; bar += add) { epf_bar = &epf->bar[bar]; + /* + * pci_epc_set_bar() sets PCI_BASE_ADDRESS_MEM_TYPE_64 + * if the specific implementation required a 64-bit BAR, + * even if we only requested a 32-bit BAR. + */ + add = (epf_bar->flags & PCI_BASE_ADDRESS_MEM_TYPE_64) ? 2 : 1; if (!!(epc_features->reserved_bar & (1 << bar))) continue; @@ -413,13 +419,6 @@ static int pci_epf_test_set_bar(struct pci_epf *epf) if (bar == test_reg_bar) return ret; } - /* - * pci_epc_set_bar() sets PCI_BASE_ADDRESS_MEM_TYPE_64 - * if the specific implementation required a 64-bit BAR, - * even if we only requested a 32-bit BAR. - */ - if (epf_bar->flags & PCI_BASE_ADDRESS_MEM_TYPE_64) - bar++; } return 0; @@ -431,13 +430,19 @@ static int pci_epf_test_alloc_space(struct pci_epf *epf) struct device *dev = &epf->dev; struct pci_epf_bar *epf_bar; void *base; - int bar; + int bar, add; enum pci_barno test_reg_bar = epf_test->test_reg_bar; const struct pci_epc_features *epc_features; + size_t test_reg_size; epc_features = epf_test->epc_features; - base = pci_epf_alloc_space(epf, sizeof(struct pci_epf_test_reg), + if (epc_features->bar_fixed_size[test_reg_bar]) + test_reg_size = bar_size[test_reg_bar]; + else + test_reg_size = sizeof(struct pci_epf_test_reg); + + base = pci_epf_alloc_space(epf, test_reg_size, test_reg_bar, epc_features->align); if (!base) { dev_err(dev, "Failed to allocated register space\n"); @@ -445,8 +450,10 @@ static int pci_epf_test_alloc_space(struct pci_epf *epf) } epf_test->reg[test_reg_bar] = base; - for (bar = BAR_0; bar <= BAR_5; bar++) { + for (bar = BAR_0; bar <= BAR_5; bar += add) { epf_bar = &epf->bar[bar]; + add = (epf_bar->flags & PCI_BASE_ADDRESS_MEM_TYPE_64) ? 2 : 1; + if (bar == test_reg_bar) continue; @@ -459,8 +466,6 @@ static int pci_epf_test_alloc_space(struct pci_epf *epf) dev_err(dev, "Failed to allocate space for BAR%d\n", bar); epf_test->reg[bar] = base; - if (epf_bar->flags & PCI_BASE_ADDRESS_MEM_TYPE_64) - bar++; } return 0; diff --git a/drivers/pci/endpoint/pci-epc-core.c b/drivers/pci/endpoint/pci-epc-core.c index e4712a0f249c..2091508c1620 100644 --- a/drivers/pci/endpoint/pci-epc-core.c +++ b/drivers/pci/endpoint/pci-epc-core.c @@ -519,11 +519,12 @@ void pci_epc_remove_epf(struct pci_epc *epc, struct pci_epf *epf) { unsigned long flags; - if (!epc || IS_ERR(epc)) + if (!epc || IS_ERR(epc) || !epf) return; spin_lock_irqsave(&epc->lock, flags); list_del(&epf->list); + epf->epc = NULL; spin_unlock_irqrestore(&epc->lock, flags); } EXPORT_SYMBOL_GPL(pci_epc_remove_epf); diff --git a/drivers/pci/iov.c b/drivers/pci/iov.c index 3aa115ed3a65..525fd3f272b3 100644 --- a/drivers/pci/iov.c +++ b/drivers/pci/iov.c @@ -132,8 +132,6 @@ static void pci_read_vf_config_common(struct pci_dev *virtfn) &physfn->sriov->subsystem_vendor); pci_read_config_word(virtfn, PCI_SUBSYSTEM_ID, &physfn->sriov->subsystem_device); - - physfn->sriov->cfg_size = pci_cfg_space_size(virtfn); } int pci_iov_add_virtfn(struct pci_dev *dev, int id) diff --git a/drivers/pci/mmap.c b/drivers/pci/mmap.c index 24505b08de40..b8c9011987f4 100644 --- a/drivers/pci/mmap.c +++ b/drivers/pci/mmap.c @@ -73,7 +73,7 @@ int pci_mmap_resource_range(struct pci_dev *pdev, int bar, #elif defined(HAVE_PCI_MMAP) /* && !ARCH_GENERIC_PCI_MMAP_RESOURCE */ /* - * Legacy setup: Impement pci_mmap_resource_range() as a wrapper around + * Legacy setup: Implement pci_mmap_resource_range() as a wrapper around * the architecture's pci_mmap_page_range(), converting to "user visible" * addresses as necessary. */ diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c index e039b740fe74..59a6d232f77a 100644 --- a/drivers/pci/msi.c +++ b/drivers/pci/msi.c @@ -237,7 +237,7 @@ static void msi_set_mask_bit(struct irq_data *data, u32 flag) } /** - * pci_msi_mask_irq - Generic irq chip callback to mask PCI/MSI interrupts + * pci_msi_mask_irq - Generic IRQ chip callback to mask PCI/MSI interrupts * @data: pointer to irqdata associated to that interrupt */ void pci_msi_mask_irq(struct irq_data *data) @@ -247,7 +247,7 @@ void pci_msi_mask_irq(struct irq_data *data) EXPORT_SYMBOL_GPL(pci_msi_mask_irq); /** - * pci_msi_unmask_irq - Generic irq chip callback to unmask PCI/MSI interrupts + * pci_msi_unmask_irq - Generic IRQ chip callback to unmask PCI/MSI interrupts * @data: pointer to irqdata associated to that interrupt */ void pci_msi_unmask_irq(struct irq_data *data) @@ -588,11 +588,11 @@ static int msi_verify_entries(struct pci_dev *dev) * msi_capability_init - configure device's MSI capability structure * @dev: pointer to the pci_dev data structure of MSI device function * @nvec: number of interrupts to allocate - * @affd: description of automatic irq affinity assignments (may be %NULL) + * @affd: description of automatic IRQ affinity assignments (may be %NULL) * * Setup the MSI capability structure of the device with the requested * number of interrupts. A return value of zero indicates the successful - * setup of an entry with the new MSI irq. A negative return value indicates + * setup of an entry with the new MSI IRQ. A negative return value indicates * an error, and a positive return value indicates the number of interrupts * which could have been allocated. */ @@ -609,7 +609,7 @@ static int msi_capability_init(struct pci_dev *dev, int nvec, if (!entry) return -ENOMEM; - /* All MSIs are unmasked by default, Mask them all */ + /* All MSIs are unmasked by default; mask them all */ mask = msi_mask(entry->msi_attrib.multi_cap); msi_mask_irq(entry, mask, mask); @@ -637,7 +637,7 @@ static int msi_capability_init(struct pci_dev *dev, int nvec, return ret; } - /* Set MSI enabled bits */ + /* Set MSI enabled bits */ pci_intx_for_msi(dev, 0); pci_msi_set_enable(dev, 1); dev->msi_enabled = 1; @@ -729,11 +729,11 @@ static void msix_program_entries(struct pci_dev *dev, * @dev: pointer to the pci_dev data structure of MSI-X device function * @entries: pointer to an array of struct msix_entry entries * @nvec: number of @entries - * @affd: Optional pointer to enable automatic affinity assignement + * @affd: Optional pointer to enable automatic affinity assignment * * Setup the MSI-X capability structure of device function with a - * single MSI-X irq. A return of zero indicates the successful setup of - * requested MSI-X entries with allocated irqs or non-zero for otherwise. + * single MSI-X IRQ. A return of zero indicates the successful setup of + * requested MSI-X entries with allocated IRQs or non-zero for otherwise. **/ static int msix_capability_init(struct pci_dev *dev, struct msix_entry *entries, int nvec, struct irq_affinity *affd) @@ -789,7 +789,7 @@ static int msix_capability_init(struct pci_dev *dev, struct msix_entry *entries, out_avail: if (ret < 0) { /* - * If we had some success, report the number of irqs + * If we had some success, report the number of IRQs * we succeeded in setting up. */ struct msi_desc *entry; @@ -812,7 +812,7 @@ out_free: /** * pci_msi_supported - check whether MSI may be enabled on a device * @dev: pointer to the pci_dev data structure of MSI device function - * @nvec: how many MSIs have been requested ? + * @nvec: how many MSIs have been requested? * * Look at global flags, the device itself, and its parent buses * to determine if MSI/-X are supported for the device. If MSI/-X is @@ -896,7 +896,7 @@ static void pci_msi_shutdown(struct pci_dev *dev) /* Keep cached state to be restored */ __pci_msi_desc_mask_irq(desc, mask, ~mask); - /* Restore dev->irq to its default pin-assertion irq */ + /* Restore dev->irq to its default pin-assertion IRQ */ dev->irq = desc->msi_attrib.default_irq; pcibios_alloc_irq(dev); } @@ -958,7 +958,7 @@ static int __pci_enable_msix(struct pci_dev *dev, struct msix_entry *entries, } } - /* Check whether driver already requested for MSI irq */ + /* Check whether driver already requested for MSI IRQ */ if (dev->msi_enabled) { pci_info(dev, "can't enable MSI-X (MSI IRQ already assigned)\n"); return -EINVAL; @@ -1026,7 +1026,7 @@ static int __pci_enable_msi_range(struct pci_dev *dev, int minvec, int maxvec, if (!pci_msi_supported(dev, minvec)) return -EINVAL; - /* Check whether driver already requested MSI-X irqs */ + /* Check whether driver already requested MSI-X IRQs */ if (dev->msix_enabled) { pci_info(dev, "can't enable MSI (MSI-X already enabled)\n"); return -EINVAL; @@ -1113,8 +1113,8 @@ static int __pci_enable_msix_range(struct pci_dev *dev, * pci_enable_msix_range - configure device's MSI-X capability structure * @dev: pointer to the pci_dev data structure of MSI-X device function * @entries: pointer to an array of MSI-X entries - * @minvec: minimum number of MSI-X irqs requested - * @maxvec: maximum number of MSI-X irqs requested + * @minvec: minimum number of MSI-X IRQs requested + * @maxvec: maximum number of MSI-X IRQs requested * * Setup the MSI-X capability structure of device function with a maximum * possible number of interrupts in the range between @minvec and @maxvec @@ -1179,7 +1179,7 @@ int pci_alloc_irq_vectors_affinity(struct pci_dev *dev, unsigned int min_vecs, return msi_vecs; } - /* use legacy irq if allowed */ + /* use legacy IRQ if allowed */ if (flags & PCI_IRQ_LEGACY) { if (min_vecs == 1 && dev->irq) { /* @@ -1248,7 +1248,7 @@ int pci_irq_vector(struct pci_dev *dev, unsigned int nr) EXPORT_SYMBOL(pci_irq_vector); /** - * pci_irq_get_affinity - return the affinity of a particular msi vector + * pci_irq_get_affinity - return the affinity of a particular MSI vector * @dev: PCI device to operate on * @nr: device-relative interrupt vector index (0-based). */ @@ -1280,7 +1280,7 @@ const struct cpumask *pci_irq_get_affinity(struct pci_dev *dev, int nr) EXPORT_SYMBOL(pci_irq_get_affinity); /** - * pci_irq_get_node - return the numa node of a particular msi vector + * pci_irq_get_node - return the NUMA node of a particular MSI vector * @pdev: PCI device to operate on * @vec: device-relative interrupt vector index (0-based). */ @@ -1330,7 +1330,7 @@ void pci_msi_domain_write_msg(struct irq_data *irq_data, struct msi_msg *msg) /** * pci_msi_domain_calc_hwirq - Generate a unique ID for an MSI source * @dev: Pointer to the PCI device - * @desc: Pointer to the msi descriptor + * @desc: Pointer to the MSI descriptor * * The ID number is only used within the irqdomain. */ @@ -1348,7 +1348,8 @@ static inline bool pci_msi_desc_is_multi_msi(struct msi_desc *desc) } /** - * pci_msi_domain_check_cap - Verify that @domain supports the capabilities for @dev + * pci_msi_domain_check_cap - Verify that @domain supports the capabilities + * for @dev * @domain: The interrupt domain to check * @info: The domain info for verification * @dev: The device to check diff --git a/drivers/pci/p2pdma.c b/drivers/pci/p2pdma.c index a3073ce16520..234476226529 100644 --- a/drivers/pci/p2pdma.c +++ b/drivers/pci/p2pdma.c @@ -195,7 +195,7 @@ EXPORT_SYMBOL_GPL(pci_p2pdma_add_resource); /* * Note this function returns the parent PCI device with a - * reference taken. It is the caller's responsibily to drop + * reference taken. It is the caller's responsibility to drop * the reference. */ static struct pci_dev *find_parent_pci_dev(struct device *dev) @@ -355,7 +355,7 @@ static int upstream_bridge_distance(struct pci_dev *provider, /* * Allow the connection if both devices are on a whitelisted root - * complex, but add an arbitary large value to the distance. + * complex, but add an arbitrary large value to the distance. */ if (root_complex_whitelist(provider) && root_complex_whitelist(client)) @@ -414,7 +414,7 @@ static int upstream_bridge_distance_warn(struct pci_dev *provider, } /** - * pci_p2pdma_distance_many - Determive the cumulative distance between + * pci_p2pdma_distance_many - Determine the cumulative distance between * a p2pdma provider and the clients in use. * @provider: p2pdma provider to check against the client list * @clients: array of devices to check (NULL-terminated) @@ -443,6 +443,14 @@ int pci_p2pdma_distance_many(struct pci_dev *provider, struct device **clients, return -1; for (i = 0; i < num_clients; i++) { + if (IS_ENABLED(CONFIG_DMA_VIRT_OPS) && + clients[i]->dma_ops == &dma_virt_ops) { + if (verbose) + dev_warn(clients[i], + "cannot be used for peer-to-peer DMA because the driver makes use of dma_virt_ops\n"); + return -1; + } + pci_client = find_parent_pci_dev(clients[i]); if (!pci_client) { if (verbose) @@ -721,7 +729,7 @@ int pci_p2pdma_map_sg(struct device *dev, struct scatterlist *sg, int nents, * p2pdma mappings are not compatible with devices that use * dma_virt_ops. If the upper layers do the right thing * this should never happen because it will be prevented - * by the check in pci_p2pdma_add_client() + * by the check in pci_p2pdma_distance_many() */ if (WARN_ON_ONCE(IS_ENABLED(CONFIG_DMA_VIRT_OPS) && dev->dma_ops == &dma_virt_ops)) diff --git a/drivers/pci/pci-bridge-emul.c b/drivers/pci/pci-bridge-emul.c index 83fb077d0b41..06083b86d4f4 100644 --- a/drivers/pci/pci-bridge-emul.c +++ b/drivers/pci/pci-bridge-emul.c @@ -305,7 +305,7 @@ int pci_bridge_emul_init(struct pci_bridge_emul *bridge, } /* - * Cleanup a pci_bridge_emul structure that was previously initilized + * Cleanup a pci_bridge_emul structure that was previously initialized * using pci_bridge_emul_init(). */ void pci_bridge_emul_cleanup(struct pci_bridge_emul *bridge) diff --git a/drivers/pci/pci-driver.c b/drivers/pci/pci-driver.c index 36dbe960306b..a8124e47bf6e 100644 --- a/drivers/pci/pci-driver.c +++ b/drivers/pci/pci-driver.c @@ -399,7 +399,8 @@ void __weak pcibios_free_irq(struct pci_dev *dev) #ifdef CONFIG_PCI_IOV static inline bool pci_device_can_probe(struct pci_dev *pdev) { - return (!pdev->is_virtfn || pdev->physfn->sriov->drivers_autoprobe); + return (!pdev->is_virtfn || pdev->physfn->sriov->drivers_autoprobe || + pdev->driver_override); } #else static inline bool pci_device_can_probe(struct pci_dev *pdev) @@ -414,6 +415,9 @@ static int pci_device_probe(struct device *dev) struct pci_dev *pci_dev = to_pci_dev(dev); struct pci_driver *drv = to_pci_driver(dev->driver); + if (!pci_device_can_probe(pci_dev)) + return -ENODEV; + pci_assign_irq(pci_dev); error = pcibios_alloc_irq(pci_dev); @@ -421,12 +425,10 @@ static int pci_device_probe(struct device *dev) return error; pci_dev_get(pci_dev); - if (pci_device_can_probe(pci_dev)) { - error = __pci_device_probe(drv, pci_dev); - if (error) { - pcibios_free_irq(pci_dev); - pci_dev_put(pci_dev); - } + error = __pci_device_probe(drv, pci_dev); + if (error) { + pcibios_free_irq(pci_dev); + pci_dev_put(pci_dev); } return error; diff --git a/drivers/pci/pci-pf-stub.c b/drivers/pci/pci-pf-stub.c index 9795649fc6f9..ef293e735c55 100644 --- a/drivers/pci/pci-pf-stub.c +++ b/drivers/pci/pci-pf-stub.c @@ -1,7 +1,7 @@ // SPDX-License-Identifier: GPL-2.0 /* pci-pf-stub - simple stub driver for PCI SR-IOV PF device * - * This driver is meant to act as a "whitelist" for devices that provde + * This driver is meant to act as a "whitelist" for devices that provide * SR-IOV functionality while at the same time not actually needing a * driver of their own. */ diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c index 6d27475e39b2..965c72104150 100644 --- a/drivers/pci/pci-sysfs.c +++ b/drivers/pci/pci-sysfs.c @@ -182,6 +182,9 @@ static ssize_t current_link_speed_show(struct device *dev, return -EINVAL; switch (linkstat & PCI_EXP_LNKSTA_CLS) { + case PCI_EXP_LNKSTA_CLS_32_0GB: + speed = "32 GT/s"; + break; case PCI_EXP_LNKSTA_CLS_16_0GB: speed = "16 GT/s"; break; @@ -477,7 +480,7 @@ static ssize_t remove_store(struct device *dev, struct device_attribute *attr, pci_stop_and_remove_bus_device_locked(to_pci_dev(dev)); return count; } -static struct device_attribute dev_remove_attr = __ATTR(remove, +static struct device_attribute dev_remove_attr = __ATTR_IGNORE_LOCKDEP(remove, (S_IWUSR|S_IWGRP), NULL, remove_store); diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index b1f563916036..29ed5ec1ac27 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -4535,7 +4535,7 @@ static int pci_af_flr(struct pci_dev *dev, int probe) /* * Wait for Transaction Pending bit to clear. A word-aligned test - * is used, so we use the conrol offset rather than status and shift + * is used, so we use the control offset rather than status and shift * the test bit to match. */ if (!pci_wait_for_pending(dev, pos + PCI_AF_CTRL, @@ -5669,7 +5669,9 @@ enum pci_bus_speed pcie_get_speed_cap(struct pci_dev *dev) */ pcie_capability_read_dword(dev, PCI_EXP_LNKCAP2, &lnkcap2); if (lnkcap2) { /* PCIe r3.0-compliant */ - if (lnkcap2 & PCI_EXP_LNKCAP2_SLS_16_0GB) + if (lnkcap2 & PCI_EXP_LNKCAP2_SLS_32_0GB) + return PCIE_SPEED_32_0GT; + else if (lnkcap2 & PCI_EXP_LNKCAP2_SLS_16_0GB) return PCIE_SPEED_16_0GT; else if (lnkcap2 & PCI_EXP_LNKCAP2_SLS_8_0GB) return PCIE_SPEED_8_0GT; diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h index 5db6f985f16d..1be03a97cb92 100644 --- a/drivers/pci/pci.h +++ b/drivers/pci/pci.h @@ -298,7 +298,6 @@ struct pci_sriov { u16 driver_max_VFs; /* Max num VFs driver supports */ struct pci_dev *dev; /* Lowest numbered PF */ struct pci_dev *self; /* This PF */ - u32 cfg_size; /* VF config space size */ u32 class; /* VF device */ u8 hdr_type; /* VF header type */ u16 subsystem_vendor; /* VF subsystem vendor */ diff --git a/drivers/pci/pcie/aer_inject.c b/drivers/pci/pcie/aer_inject.c index 043b8b0cfcc5..6988fe7389b9 100644 --- a/drivers/pci/pcie/aer_inject.c +++ b/drivers/pci/pcie/aer_inject.c @@ -2,7 +2,7 @@ /* * PCIe AER software error injection support. * - * Debuging PCIe AER code is quite difficult because it is hard to + * Debugging PCIe AER code is quite difficult because it is hard to * trigger various real hardware errors. Software based error * injection can fake almost all kinds of errors with the help of a * user space helper tool aer-inject, which can be gotten from: diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c index f9ef7ad3f75d..a3c7338fad86 100644 --- a/drivers/pci/probe.c +++ b/drivers/pci/probe.c @@ -668,7 +668,7 @@ const unsigned char pcie_link_speed[] = { PCIE_SPEED_5_0GT, /* 2 */ PCIE_SPEED_8_0GT, /* 3 */ PCIE_SPEED_16_0GT, /* 4 */ - PCI_SPEED_UNKNOWN, /* 5 */ + PCIE_SPEED_32_0GT, /* 5 */ PCI_SPEED_UNKNOWN, /* 6 */ PCI_SPEED_UNKNOWN, /* 7 */ PCI_SPEED_UNKNOWN, /* 8 */ @@ -1555,17 +1555,6 @@ static int pci_cfg_space_size_ext(struct pci_dev *dev) return PCI_CFG_SPACE_EXP_SIZE; } -#ifdef CONFIG_PCI_IOV -static bool is_vf0(struct pci_dev *dev) -{ - if (pci_iov_virtfn_devfn(dev->physfn, 0) == dev->devfn && - pci_iov_virtfn_bus(dev->physfn, 0) == dev->bus->number) - return true; - - return false; -} -#endif - int pci_cfg_space_size(struct pci_dev *dev) { int pos; @@ -1573,9 +1562,18 @@ int pci_cfg_space_size(struct pci_dev *dev) u16 class; #ifdef CONFIG_PCI_IOV - /* Read cached value for all VFs except for VF0 */ - if (dev->is_virtfn && !is_vf0(dev)) - return dev->physfn->sriov->cfg_size; + /* + * Per the SR-IOV specification (rev 1.1, sec 3.5), VFs are required to + * implement a PCIe capability and therefore must implement extended + * config space. We can skip the NO_EXTCFG test below and the + * reachability/aliasing test in pci_cfg_space_size_ext() by virtue of + * the fact that the SR-IOV capability on the PF resides in extended + * config space and must be accessible and non-aliased to have enabled + * support for this VF. This is a micro performance optimization for + * systems supporting many VFs. + */ + if (dev->is_virtfn) + return PCI_CFG_SPACE_EXP_SIZE; #endif if (dev->bus->bus_flags & PCI_BUS_FLAGS_NO_EXTCFG) diff --git a/drivers/pci/proc.c b/drivers/pci/proc.c index 445b51db75b0..fe7fe678965b 100644 --- a/drivers/pci/proc.c +++ b/drivers/pci/proc.c @@ -377,7 +377,7 @@ static int show_device(struct seq_file *m, void *v) } seq_putc(m, '\t'); if (drv) - seq_printf(m, "%s", drv->name); + seq_puts(m, drv->name); seq_putc(m, '\n'); return 0; } diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c index 0f16acc323c6..208aacf39329 100644 --- a/drivers/pci/quirks.c +++ b/drivers/pci/quirks.c @@ -4934,35 +4934,49 @@ static void quirk_fsl_no_msi(struct pci_dev *pdev) DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_FREESCALE, PCI_ANY_ID, quirk_fsl_no_msi); /* - * GPUs with integrated HDA controller for streaming audio to attached displays - * need a device link from the HDA controller (consumer) to the GPU (supplier) - * so that the GPU is powered up whenever the HDA controller is accessed. - * The GPU and HDA controller are functions 0 and 1 of the same PCI device. - * The device link stays in place until shutdown (or removal of the PCI device - * if it's hotplugged). Runtime PM is allowed by default on the HDA controller - * to prevent it from permanently keeping the GPU awake. + * Although not allowed by the spec, some multi-function devices have + * dependencies of one function (consumer) on another (supplier). For the + * consumer to work in D0, the supplier must also be in D0. Create a + * device link from the consumer to the supplier to enforce this + * dependency. Runtime PM is allowed by default on the consumer to prevent + * it from permanently keeping the supplier awake. */ -static void quirk_gpu_hda(struct pci_dev *hda) +static void pci_create_device_link(struct pci_dev *pdev, unsigned int consumer, + unsigned int supplier, unsigned int class, + unsigned int class_shift) { - struct pci_dev *gpu; + struct pci_dev *supplier_pdev; - if (PCI_FUNC(hda->devfn) != 1) + if (PCI_FUNC(pdev->devfn) != consumer) return; - gpu = pci_get_domain_bus_and_slot(pci_domain_nr(hda->bus), - hda->bus->number, - PCI_DEVFN(PCI_SLOT(hda->devfn), 0)); - if (!gpu || (gpu->class >> 16) != PCI_BASE_CLASS_DISPLAY) { - pci_dev_put(gpu); + supplier_pdev = pci_get_domain_bus_and_slot(pci_domain_nr(pdev->bus), + pdev->bus->number, + PCI_DEVFN(PCI_SLOT(pdev->devfn), supplier)); + if (!supplier_pdev || (supplier_pdev->class >> class_shift) != class) { + pci_dev_put(supplier_pdev); return; } - if (!device_link_add(&hda->dev, &gpu->dev, - DL_FLAG_STATELESS | DL_FLAG_PM_RUNTIME)) - pci_err(hda, "cannot link HDA to GPU %s\n", pci_name(gpu)); + if (device_link_add(&pdev->dev, &supplier_pdev->dev, + DL_FLAG_STATELESS | DL_FLAG_PM_RUNTIME)) + pci_info(pdev, "D0 power state depends on %s\n", + pci_name(supplier_pdev)); + else + pci_err(pdev, "Cannot enforce power dependency on %s\n", + pci_name(supplier_pdev)); + + pm_runtime_allow(&pdev->dev); + pci_dev_put(supplier_pdev); +} - pm_runtime_allow(&hda->dev); - pci_dev_put(gpu); +/* + * Create device link for GPUs with integrated HDA controller for streaming + * audio to attached displays. + */ +static void quirk_gpu_hda(struct pci_dev *hda) +{ + pci_create_device_link(hda, 1, 0, PCI_BASE_CLASS_DISPLAY, 16); } DECLARE_PCI_FIXUP_CLASS_FINAL(PCI_VENDOR_ID_ATI, PCI_ANY_ID, PCI_CLASS_MULTIMEDIA_HD_AUDIO, 8, quirk_gpu_hda); @@ -4972,6 +4986,62 @@ DECLARE_PCI_FIXUP_CLASS_FINAL(PCI_VENDOR_ID_NVIDIA, PCI_ANY_ID, PCI_CLASS_MULTIMEDIA_HD_AUDIO, 8, quirk_gpu_hda); /* + * Create device link for NVIDIA GPU with integrated USB xHCI Host + * controller to VGA. + */ +static void quirk_gpu_usb(struct pci_dev *usb) +{ + pci_create_device_link(usb, 2, 0, PCI_BASE_CLASS_DISPLAY, 16); +} +DECLARE_PCI_FIXUP_CLASS_FINAL(PCI_VENDOR_ID_NVIDIA, PCI_ANY_ID, + PCI_CLASS_SERIAL_USB, 8, quirk_gpu_usb); + +/* + * Create device link for NVIDIA GPU with integrated Type-C UCSI controller + * to VGA. Currently there is no class code defined for UCSI device over PCI + * so using UNKNOWN class for now and it will be updated when UCSI + * over PCI gets a class code. + */ +#define PCI_CLASS_SERIAL_UNKNOWN 0x0c80 +static void quirk_gpu_usb_typec_ucsi(struct pci_dev *ucsi) +{ + pci_create_device_link(ucsi, 3, 0, PCI_BASE_CLASS_DISPLAY, 16); +} +DECLARE_PCI_FIXUP_CLASS_FINAL(PCI_VENDOR_ID_NVIDIA, PCI_ANY_ID, + PCI_CLASS_SERIAL_UNKNOWN, 8, + quirk_gpu_usb_typec_ucsi); + +/* + * Enable the NVIDIA GPU integrated HDA controller if the BIOS left it + * disabled. https://devtalk.nvidia.com/default/topic/1024022 + */ +static void quirk_nvidia_hda(struct pci_dev *gpu) +{ + u8 hdr_type; + u32 val; + + /* There was no integrated HDA controller before MCP89 */ + if (gpu->device < PCI_DEVICE_ID_NVIDIA_GEFORCE_320M) + return; + + /* Bit 25 at offset 0x488 enables the HDA controller */ + pci_read_config_dword(gpu, 0x488, &val); + if (val & BIT(25)) + return; + + pci_info(gpu, "Enabling HDA controller\n"); + pci_write_config_dword(gpu, 0x488, val | BIT(25)); + + /* The GPU becomes a multi-function device when the HDA is enabled */ + pci_read_config_byte(gpu, PCI_HEADER_TYPE, &hdr_type); + gpu->multifunction = !!(hdr_type & 0x80); +} +DECLARE_PCI_FIXUP_CLASS_HEADER(PCI_VENDOR_ID_NVIDIA, PCI_ANY_ID, + PCI_BASE_CLASS_DISPLAY, 16, quirk_nvidia_hda); +DECLARE_PCI_FIXUP_CLASS_RESUME_EARLY(PCI_VENDOR_ID_NVIDIA, PCI_ANY_ID, + PCI_BASE_CLASS_DISPLAY, 16, quirk_nvidia_hda); + +/* * Some IDT switches incorrectly flag an ACS Source Validation error on * completions for config read requests even though PCIe r4.0, sec * 6.12.1.1, says that completions are never affected by ACS Source diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c index 0cdd5ff389de..79b1fa6519be 100644 --- a/drivers/pci/setup-bus.c +++ b/drivers/pci/setup-bus.c @@ -1684,10 +1684,15 @@ static enum enable_type pci_realloc_detect(struct pci_bus *bus, enum enable_type enable_local) { bool unassigned = false; + struct pci_host_bridge *host; if (enable_local != undefined) return enable_local; + host = pci_find_host_bridge(bus); + if (host->preserve_config) + return auto_disabled; + pci_walk_bus(bus, iov_resources_unassigned, &unassigned); if (unassigned) return auto_enabled; @@ -1861,16 +1866,6 @@ static void pci_bus_distribute_available_resources(struct pci_bus *bus, available_mmio_pref); /* - * Calculate the total amount of extra resource space we can - * pass to bridges below this one. This is basically the - * extra space reduced by the minimal required space for the - * non-hotplug bridges. - */ - remaining_io = available_io; - remaining_mmio = available_mmio; - remaining_mmio_pref = available_mmio_pref; - - /* * Calculate how many hotplug bridges and normal bridges there * are on this bus. We will distribute the additional available * resources between hotplug bridges. @@ -1882,6 +1877,34 @@ static void pci_bus_distribute_available_resources(struct pci_bus *bus, normal_bridges++; } + /* + * There is only one bridge on the bus so it gets all available + * resources which it can then distribute to the possible hotplug + * bridges below. + */ + if (hotplug_bridges + normal_bridges == 1) { + dev = list_first_entry(&bus->devices, struct pci_dev, bus_list); + if (dev->subordinate) { + pci_bus_distribute_available_resources(dev->subordinate, + add_list, available_io, available_mmio, + available_mmio_pref); + } + return; + } + + if (hotplug_bridges == 0) + return; + + /* + * Calculate the total amount of extra resource space we can + * pass to bridges below this one. This is basically the + * extra space reduced by the minimal required space for the + * non-hotplug bridges. + */ + remaining_io = available_io; + remaining_mmio = available_mmio; + remaining_mmio_pref = available_mmio_pref; + for_each_pci_bridge(dev, bus) { const struct resource *res; @@ -1906,21 +1929,6 @@ static void pci_bus_distribute_available_resources(struct pci_bus *bus, } /* - * There is only one bridge on the bus so it gets all available - * resources which it can then distribute to the possible hotplug - * bridges below. - */ - if (hotplug_bridges + normal_bridges == 1) { - dev = list_first_entry(&bus->devices, struct pci_dev, bus_list); - if (dev->subordinate) { - pci_bus_distribute_available_resources(dev->subordinate, - add_list, available_io, available_mmio, - available_mmio_pref); - } - return; - } - - /* * Go over devices on this bus and distribute the remaining * resource space between hotplug bridges. */ @@ -1936,8 +1944,6 @@ static void pci_bus_distribute_available_resources(struct pci_bus *bus, * Distribute available extra resources equally between * hotplug-capable downstream ports taking alignment into * account. - * - * Here hotplug_bridges is always != 0. */ align = pci_resource_alignment(bridge, io_res); io = div64_ul(available_io, hotplug_bridges); diff --git a/drivers/pci/slot.c b/drivers/pci/slot.c index f4d92b1afe7b..ae4aa0e1f2f4 100644 --- a/drivers/pci/slot.c +++ b/drivers/pci/slot.c @@ -75,6 +75,7 @@ static const char *pci_bus_speed_strings[] = { "5.0 GT/s PCIe", /* 0x15 */ "8.0 GT/s PCIe", /* 0x16 */ "16.0 GT/s PCIe", /* 0x17 */ + "32.0 GT/s PCIe", /* 0x18 */ }; static ssize_t bus_speed_read(enum pci_bus_speed speed, char *buf) diff --git a/drivers/power/supply/power_supply_core.c b/drivers/power/supply/power_supply_core.c index 136e8f64848a..b55cdfe22a2e 100644 --- a/drivers/power/supply/power_supply_core.c +++ b/drivers/power/supply/power_supply_core.c @@ -606,7 +606,7 @@ int power_supply_get_battery_info(struct power_supply *psy, /* The property and field names below must correspond to elements * in enum power_supply_property. For reasoning, see - * Documentation/power/power_supply_class.txt. + * Documentation/power/power_supply_class.rst. */ of_property_read_u32(battery_np, "energy-full-design-microwatt-hours", diff --git a/drivers/soc/tegra/pmc.c b/drivers/soc/tegra/pmc.c index 8878720dd779..17e7796a832b 100644 --- a/drivers/soc/tegra/pmc.c +++ b/drivers/soc/tegra/pmc.c @@ -700,6 +700,7 @@ int tegra_powergate_power_on(unsigned int id) return tegra_powergate_set(pmc, id, true); } +EXPORT_SYMBOL(tegra_powergate_power_on); /** * tegra_powergate_power_off() - power off partition diff --git a/include/linux/interrupt.h b/include/linux/interrupt.h index c7eef32e7739..5b8328a99b2a 100644 --- a/include/linux/interrupt.h +++ b/include/linux/interrupt.h @@ -52,7 +52,7 @@ * irq line disabled until the threaded handler has been run. * IRQF_NO_SUSPEND - Do not disable this IRQ during suspend. Does not guarantee * that this interrupt will wake the system from a suspended - * state. See Documentation/power/suspend-and-interrupts.txt + * state. See Documentation/power/suspend-and-interrupts.rst * IRQF_FORCE_RESUME - Force enable it on resume even if IRQF_NO_SUSPEND is set * IRQF_NO_THREAD - Interrupt cannot be threaded * IRQF_EARLY_RESUME - Resume IRQ early during syscore instead of at device diff --git a/include/linux/mod_devicetable.h b/include/linux/mod_devicetable.h index 09366859aac2..b2c1648f7e5d 100644 --- a/include/linux/mod_devicetable.h +++ b/include/linux/mod_devicetable.h @@ -16,6 +16,25 @@ typedef unsigned long kernel_ulong_t; #define PCI_ANY_ID (~0) +/** + * struct pci_device_id - PCI device ID structure + * @vendor: Vendor ID to match (or PCI_ANY_ID) + * @device: Device ID to match (or PCI_ANY_ID) + * @subvendor: Subsystem vendor ID to match (or PCI_ANY_ID) + * @subdevice: Subsystem device ID to match (or PCI_ANY_ID) + * @class: Device class, subclass, and "interface" to match. + * See Appendix D of the PCI Local Bus Spec or + * include/linux/pci_ids.h for a full list of classes. + * Most drivers do not need to specify class/class_mask + * as vendor/device is normally sufficient. + * @class_mask: Limit which sub-fields of the class field are compared. + * See drivers/scsi/sym53c8xx_2/ for example of usage. + * @driver_data: Data private to the driver. + * Most drivers don't need to use driver_data field. + * Best practice is to use driver_data as an index + * into a static list of equivalent device types, + * instead of using it as a pointer. + */ struct pci_device_id { __u32 vendor, device; /* Vendor and device ID or PCI_ANY_ID*/ __u32 subvendor, subdevice; /* Subsystem ID's or PCI_ANY_ID */ @@ -257,17 +276,17 @@ struct pcmcia_device_id { __u16 match_flags; __u16 manf_id; - __u16 card_id; + __u16 card_id; - __u8 func_id; + __u8 func_id; /* for real multi-function devices */ - __u8 function; + __u8 function; /* for pseudo multi-function devices */ - __u8 device_no; + __u8 device_no; - __u32 prod_id_hash[4]; + __u32 prod_id_hash[4]; /* not matched against in kernelspace */ const char * prod_id[4]; diff --git a/include/linux/pci-acpi.h b/include/linux/pci-acpi.h index 8082b612f561..62b7fdcc661c 100644 --- a/include/linux/pci-acpi.h +++ b/include/linux/pci-acpi.h @@ -107,9 +107,10 @@ static inline void acpiphp_check_host_bridge(struct acpi_device *adev) { } #endif extern const guid_t pci_acpi_dsm_guid; -#define DEVICE_LABEL_DSM 0x07 -#define RESET_DELAY_DSM 0x08 -#define FUNCTION_DELAY_DSM 0x09 +#define IGNORE_PCI_BOOT_CONFIG_DSM 0x05 +#define DEVICE_LABEL_DSM 0x07 +#define RESET_DELAY_DSM 0x08 +#define FUNCTION_DELAY_DSM 0x09 #else /* CONFIG_ACPI */ static inline void acpi_pci_add_bus(struct pci_bus *bus) { } diff --git a/include/linux/pci.h b/include/linux/pci.h index dd436da7eccc..2972793e3028 100644 --- a/include/linux/pci.h +++ b/include/linux/pci.h @@ -151,6 +151,8 @@ static inline const char *pci_power_name(pci_power_t state) #define PCI_PM_BUS_WAIT 50 /** + * typedef pci_channel_state_t + * * The pci_channel state describes connectivity between the CPU and * the PCI device. If some PCI bus between here and the PCI device * has crashed or locked up, this info is reflected here. @@ -258,6 +260,7 @@ enum pci_bus_speed { PCIE_SPEED_5_0GT = 0x15, PCIE_SPEED_8_0GT = 0x16, PCIE_SPEED_16_0GT = 0x17, + PCIE_SPEED_32_0GT = 0x18, PCI_SPEED_UNKNOWN = 0xff, }; @@ -383,7 +386,7 @@ struct pci_dev { unsigned int is_busmaster:1; /* Is busmaster */ unsigned int no_msi:1; /* May not use MSI */ - unsigned int no_64bit_msi:1; /* May only use 32-bit MSIs */ + unsigned int no_64bit_msi:1; /* May only use 32-bit MSIs */ unsigned int block_cfg_access:1; /* Config space access blocked */ unsigned int broken_parity_status:1; /* Generates false positive parity */ unsigned int irq_reroute_variant:2; /* Needs IRQ rerouting variant */ @@ -506,6 +509,8 @@ struct pci_host_bridge { unsigned int native_shpc_hotplug:1; /* OS may use SHPC hotplug */ unsigned int native_pme:1; /* OS may use PCIe PME */ unsigned int native_ltr:1; /* OS may use PCIe LTR */ + unsigned int preserve_config:1; /* Preserve FW resource setup */ + /* Resource alignment requirements */ resource_size_t (*align_resource)(struct pci_dev *dev, const struct resource *res, @@ -776,6 +781,50 @@ struct pci_error_handlers { struct module; + +/** + * struct pci_driver - PCI driver structure + * @node: List of driver structures. + * @name: Driver name. + * @id_table: Pointer to table of device IDs the driver is + * interested in. Most drivers should export this + * table using MODULE_DEVICE_TABLE(pci,...). + * @probe: This probing function gets called (during execution + * of pci_register_driver() for already existing + * devices or later if a new device gets inserted) for + * all PCI devices which match the ID table and are not + * "owned" by the other drivers yet. This function gets + * passed a "struct pci_dev \*" for each device whose + * entry in the ID table matches the device. The probe + * function returns zero when the driver chooses to + * take "ownership" of the device or an error code + * (negative number) otherwise. + * The probe function always gets called from process + * context, so it can sleep. + * @remove: The remove() function gets called whenever a device + * being handled by this driver is removed (either during + * deregistration of the driver or when it's manually + * pulled out of a hot-pluggable slot). + * The remove function always gets called from process + * context, so it can sleep. + * @suspend: Put device into low power state. + * @suspend_late: Put device into low power state. + * @resume_early: Wake device from low power state. + * @resume: Wake device from low power state. + * (Please see Documentation/power/pci.rst for descriptions + * of PCI Power Management and the related functions.) + * @shutdown: Hook into reboot_notifier_list (kernel/sys.c). + * Intended to stop any idling DMA operations. + * Useful for enabling wake-on-lan (NIC) or changing + * the power state of a device before reboot. + * e.g. drivers/net/e100.c. + * @sriov_configure: Optional driver callback to allow configuration of + * number of VFs to enable via sysfs "sriov_numvfs" file. + * @err_handler: See Documentation/PCI/pci-error-recovery.rst + * @groups: Sysfs attribute groups. + * @driver: Driver model structure. + * @dynids: List of dynamically added device IDs. + */ struct pci_driver { struct list_head node; const char *name; @@ -2207,7 +2256,7 @@ static inline u8 pci_vpd_srdt_tag(const u8 *srdt) /** * pci_vpd_info_field_size - Extracts the information field length - * @lrdt: Pointer to the beginning of an information field header + * @info_field: Pointer to the beginning of an information field header * * Returns the extracted information field length. */ diff --git a/include/linux/pci_ids.h b/include/linux/pci_ids.h index 70e86148cb1e..40015609c4b5 100644 --- a/include/linux/pci_ids.h +++ b/include/linux/pci_ids.h @@ -1112,7 +1112,7 @@ #define PCI_VENDOR_ID_AL 0x10b9 #define PCI_DEVICE_ID_AL_M1533 0x1533 -#define PCI_DEVICE_ID_AL_M1535 0x1535 +#define PCI_DEVICE_ID_AL_M1535 0x1535 #define PCI_DEVICE_ID_AL_M1541 0x1541 #define PCI_DEVICE_ID_AL_M1563 0x1563 #define PCI_DEVICE_ID_AL_M1621 0x1621 @@ -1336,6 +1336,7 @@ #define PCI_DEVICE_ID_NVIDIA_NFORCE_MCP78S_SMBUS 0x0752 #define PCI_DEVICE_ID_NVIDIA_NFORCE_MCP77_IDE 0x0759 #define PCI_DEVICE_ID_NVIDIA_NFORCE_MCP73_SMBUS 0x07D8 +#define PCI_DEVICE_ID_NVIDIA_GEFORCE_320M 0x08A0 #define PCI_DEVICE_ID_NVIDIA_NFORCE_MCP79_SMBUS 0x0AA2 #define PCI_DEVICE_ID_NVIDIA_NFORCE_MCP89_SATA 0x0D85 @@ -1752,7 +1753,7 @@ #define PCI_VENDOR_ID_STALLION 0x124d /* Allied Telesyn */ -#define PCI_VENDOR_ID_AT 0x1259 +#define PCI_VENDOR_ID_AT 0x1259 #define PCI_SUBDEVICE_ID_AT_2700FX 0x2701 #define PCI_SUBDEVICE_ID_AT_2701FX 0x2703 @@ -2550,7 +2551,7 @@ #define PCI_DEVICE_ID_KORENIX_JETCARDF2 0x1700 #define PCI_DEVICE_ID_KORENIX_JETCARDF3 0x17ff -#define PCI_VENDOR_ID_HUAWEI 0x19e5 +#define PCI_VENDOR_ID_HUAWEI 0x19e5 #define PCI_VENDOR_ID_NETRONOME 0x19ee #define PCI_DEVICE_ID_NETRONOME_NFP4000 0x4000 diff --git a/include/linux/pm.h b/include/linux/pm.h index 283fb3defe56..3619a870eaa4 100644 --- a/include/linux/pm.h +++ b/include/linux/pm.h @@ -271,7 +271,7 @@ typedef struct pm_message { * actions to be performed by a device driver's callbacks generally depend on * the platform and subsystem the device belongs to. * - * Refer to Documentation/power/runtime_pm.txt for more information about the + * Refer to Documentation/power/runtime_pm.rst for more information about the * role of the @runtime_suspend(), @runtime_resume() and @runtime_idle() * callbacks in device runtime power management. */ diff --git a/include/uapi/linux/pci_regs.h b/include/uapi/linux/pci_regs.h index 27164769d184..f28e562d7ca8 100644 --- a/include/uapi/linux/pci_regs.h +++ b/include/uapi/linux/pci_regs.h @@ -528,6 +528,7 @@ #define PCI_EXP_LNKCAP_SLS_5_0GB 0x00000002 /* LNKCAP2 SLS Vector bit 1 */ #define PCI_EXP_LNKCAP_SLS_8_0GB 0x00000003 /* LNKCAP2 SLS Vector bit 2 */ #define PCI_EXP_LNKCAP_SLS_16_0GB 0x00000004 /* LNKCAP2 SLS Vector bit 3 */ +#define PCI_EXP_LNKCAP_SLS_32_0GB 0x00000005 /* LNKCAP2 SLS Vector bit 4 */ #define PCI_EXP_LNKCAP_MLW 0x000003f0 /* Maximum Link Width */ #define PCI_EXP_LNKCAP_ASPMS 0x00000c00 /* ASPM Support */ #define PCI_EXP_LNKCAP_L0SEL 0x00007000 /* L0s Exit Latency */ @@ -556,6 +557,7 @@ #define PCI_EXP_LNKSTA_CLS_5_0GB 0x0002 /* Current Link Speed 5.0GT/s */ #define PCI_EXP_LNKSTA_CLS_8_0GB 0x0003 /* Current Link Speed 8.0GT/s */ #define PCI_EXP_LNKSTA_CLS_16_0GB 0x0004 /* Current Link Speed 16.0GT/s */ +#define PCI_EXP_LNKSTA_CLS_32_0GB 0x0005 /* Current Link Speed 32.0GT/s */ #define PCI_EXP_LNKSTA_NLW 0x03f0 /* Negotiated Link Width */ #define PCI_EXP_LNKSTA_NLW_X1 0x0010 /* Current Link Width x1 */ #define PCI_EXP_LNKSTA_NLW_X2 0x0020 /* Current Link Width x2 */ @@ -661,6 +663,7 @@ #define PCI_EXP_LNKCAP2_SLS_5_0GB 0x00000004 /* Supported Speed 5GT/s */ #define PCI_EXP_LNKCAP2_SLS_8_0GB 0x00000008 /* Supported Speed 8GT/s */ #define PCI_EXP_LNKCAP2_SLS_16_0GB 0x00000010 /* Supported Speed 16GT/s */ +#define PCI_EXP_LNKCAP2_SLS_32_0GB 0x00000020 /* Supported Speed 32GT/s */ #define PCI_EXP_LNKCAP2_CROSSLINK 0x00000100 /* Crosslink supported */ #define PCI_EXP_LNKCTL2 48 /* Link Control 2 */ #define PCI_EXP_LNKCTL2_TLS 0x000f @@ -668,6 +671,7 @@ #define PCI_EXP_LNKCTL2_TLS_5_0GT 0x0002 /* Supported Speed 5GT/s */ #define PCI_EXP_LNKCTL2_TLS_8_0GT 0x0003 /* Supported Speed 8GT/s */ #define PCI_EXP_LNKCTL2_TLS_16_0GT 0x0004 /* Supported Speed 16GT/s */ +#define PCI_EXP_LNKCTL2_TLS_32_0GT 0x0005 /* Supported Speed 32GT/s */ #define PCI_EXP_LNKSTA2 50 /* Link Status 2 */ #define PCI_CAP_EXP_ENDPOINT_SIZEOF_V2 52 /* v2 endpoints with link end here */ #define PCI_EXP_SLTCAP2 52 /* Slot Capabilities 2 */ diff --git a/kernel/power/Kconfig b/kernel/power/Kconfig index ff8592ddedee..d3667b4075c1 100644 --- a/kernel/power/Kconfig +++ b/kernel/power/Kconfig @@ -66,7 +66,7 @@ config HIBERNATION need to run mkswap against the swap partition used for the suspend. It also works with swap files to a limited extent (for details see - <file:Documentation/power/swsusp-and-swap-files.txt>). + <file:Documentation/power/swsusp-and-swap-files.rst>). Right now you may boot without resuming and resume later but in the meantime you cannot use the swap partition(s)/file(s) involved in @@ -75,7 +75,7 @@ config HIBERNATION MOUNT any journaled filesystems mounted before the suspend or they will get corrupted in a nasty way. - For more information take a look at <file:Documentation/power/swsusp.txt>. + For more information take a look at <file:Documentation/power/swsusp.rst>. config ARCH_SAVE_PAGE_KEYS bool @@ -256,7 +256,7 @@ config APM_EMULATION notification of APM "events" (e.g. battery status change). In order to use APM, you will need supporting software. For location - and more information, read <file:Documentation/power/apm-acpi.txt> + and more information, read <file:Documentation/power/apm-acpi.rst> and the Battery Powered Linux mini-HOWTO, available from <http://www.tldp.org/docs.html#howto>. diff --git a/net/wireless/Kconfig b/net/wireless/Kconfig index 578cce4fbe6c..67f8360dfcee 100644 --- a/net/wireless/Kconfig +++ b/net/wireless/Kconfig @@ -166,7 +166,7 @@ config CFG80211_DEFAULT_PS If this causes your applications to misbehave you should fix your applications instead -- they need to register their network - latency requirement, see Documentation/power/pm_qos_interface.txt. + latency requirement, see Documentation/power/pm_qos_interface.rst. config CFG80211_DEBUGFS bool "cfg80211 DebugFS entries" diff --git a/tools/pci/Makefile b/tools/pci/Makefile index 6876ee4bd78c..4b95a5176355 100644 --- a/tools/pci/Makefile +++ b/tools/pci/Makefile @@ -18,7 +18,6 @@ ALL_TARGETS := pcitest ALL_PROGRAMS := $(patsubst %,$(OUTPUT)%,$(ALL_TARGETS)) SCRIPTS := pcitest.sh -ALL_SCRIPTS := $(patsubst %,$(OUTPUT)%,$(SCRIPTS)) all: $(ALL_PROGRAMS) @@ -47,10 +46,10 @@ clean: install: $(ALL_PROGRAMS) install -d -m 755 $(DESTDIR)$(bindir); \ - for program in $(ALL_PROGRAMS) pcitest.sh; do \ + for program in $(ALL_PROGRAMS); do \ install $$program $(DESTDIR)$(bindir); \ done; \ - for script in $(ALL_SCRIPTS); do \ + for script in $(SCRIPTS); do \ install $$script $(DESTDIR)$(bindir); \ done diff --git a/tools/pci/pcitest.c b/tools/pci/pcitest.c index cb7a47dfd8b6..cb1e51fcc84e 100644 --- a/tools/pci/pcitest.c +++ b/tools/pci/pcitest.c @@ -36,15 +36,15 @@ struct pci_test { unsigned long size; }; -static void run_test(struct pci_test *test) +static int run_test(struct pci_test *test) { - long ret; + int ret = -EINVAL; int fd; fd = open(test->device, O_RDWR); if (fd < 0) { perror("can't open PCI Endpoint Test device"); - return; + return -ENODEV; } if (test->barnum >= 0 && test->barnum <= 5) { @@ -212,7 +212,7 @@ usage: "\t-r Read buffer test\n" "\t-w Write buffer test\n" "\t-c Copy buffer test\n" - "\t-s <size> Size of buffer {default: 100KB}\n", + "\t-s <size> Size of buffer {default: 100KB}\n" "\t-h Print this help message\n", argv[0]); return -EINVAL; |