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# SPDX-License-Identifier: GPL-2.0-only
menuconfig LIBNVDIMM
tristate "NVDIMM (Non-Volatile Memory Device) Support"
depends on PHYS_ADDR_T_64BIT
depends on HAS_IOMEM
depends on BLK_DEV
help
Generic support for non-volatile memory devices including
ACPI-6-NFIT defined resources. On platforms that define an
NFIT, or otherwise can discover NVDIMM resources, a libnvdimm
bus is registered to advertise PMEM (persistent memory)
namespaces (/dev/pmemX) and BLK (sliding mmio window(s))
namespaces (/dev/ndblkX.Y). A PMEM namespace refers to a
memory resource that may span multiple DIMMs and support DAX
(see CONFIG_DAX). A BLK namespace refers to an NVDIMM control
region which exposes an mmio register set for windowed access
mode to non-volatile memory.
if LIBNVDIMM
config BLK_DEV_PMEM
tristate "PMEM: Persistent memory block device support"
default LIBNVDIMM
select DAX_DRIVER
select ND_BTT if BTT
select ND_PFN if NVDIMM_PFN
help
Memory ranges for PMEM are described by either an NFIT
(NVDIMM Firmware Interface Table, see CONFIG_NFIT_ACPI), a
non-standard OEM-specific E820 memory type (type-12, see
CONFIG_X86_PMEM_LEGACY), or it is manually specified by the
'memmap=nn[KMG]!ss[KMG]' kernel command line (see
Documentation/admin-guide/kernel-parameters.rst). This driver converts
these persistent memory ranges into block devices that are
capable of DAX (direct-access) file system mappings. See
Documentation/nvdimm/nvdimm.txt for more details.
Say Y if you want to use an NVDIMM
config ND_BLK
tristate "BLK: Block data window (aperture) device support"
default LIBNVDIMM
select ND_BTT if BTT
help
Support NVDIMMs, or other devices, that implement a BLK-mode
access capability. BLK-mode access uses memory-mapped-i/o
apertures to access persistent media.
Say Y if your platform firmware emits an ACPI.NFIT table
(CONFIG_ACPI_NFIT), or otherwise exposes BLK-mode
capabilities.
config ND_CLAIM
bool
config ND_BTT
tristate
config BTT
bool "BTT: Block Translation Table (atomic sector updates)"
default y if LIBNVDIMM
select ND_CLAIM
help
The Block Translation Table (BTT) provides atomic sector
update semantics for persistent memory devices, so that
applications that rely on sector writes not being torn (a
guarantee that typical disks provide) can continue to do so.
The BTT manifests itself as an alternate personality for an
NVDIMM namespace, i.e. a namespace can be in raw mode (pmemX,
ndblkX.Y, etc...), or 'sectored' mode, (pmemXs, ndblkX.Ys,
etc...).
Select Y if unsure
config ND_PFN
tristate
config NVDIMM_PFN
bool "PFN: Map persistent (device) memory"
default LIBNVDIMM
depends on ZONE_DEVICE
select ND_CLAIM
help
Map persistent memory, i.e. advertise it to the memory
management sub-system. By default persistent memory does
not support direct I/O, RDMA, or any other usage that
requires a 'struct page' to mediate an I/O request. This
driver allocates and initializes the infrastructure needed
to support those use cases.
Select Y if unsure
config NVDIMM_DAX
bool "NVDIMM DAX: Raw access to persistent memory"
default LIBNVDIMM
depends on NVDIMM_PFN
help
Support raw device dax access to a persistent memory
namespace. For environments that want to hard partition
persistent memory, this capability provides a mechanism to
sub-divide a namespace into character devices that can only be
accessed via DAX (mmap(2)).
Select Y if unsure
config OF_PMEM
tristate "Device-tree support for persistent memory regions"
depends on OF
default LIBNVDIMM
help
Allows regions of persistent memory to be described in the
device-tree.
Select Y if unsure.
config NVDIMM_KEYS
def_bool y
depends on ENCRYPTED_KEYS
depends on (LIBNVDIMM=ENCRYPTED_KEYS) || LIBNVDIMM=m
endif
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