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-rw-r--r--drivers/pci/host/pcie-designware.c5
-rw-r--r--drivers/pci/msi.c75
-rw-r--r--drivers/pci/pci-sysfs.c39
3 files changed, 39 insertions, 80 deletions
diff --git a/drivers/pci/host/pcie-designware.c b/drivers/pci/host/pcie-designware.c
index 34e736601259..f72744599d12 100644
--- a/drivers/pci/host/pcie-designware.c
+++ b/drivers/pci/host/pcie-designware.c
@@ -343,9 +343,8 @@ static int dw_msi_setup_irq(struct msi_chip *chip, struct pci_dev *pdev,
struct msi_msg msg;
struct pcie_port *pp = sys_to_pcie(pdev->bus->sysdata);
- pci_read_config_word(pdev, desc->msi_attrib.pos+PCI_MSI_FLAGS,
- &msg_ctr);
- msgvec = (msg_ctr&PCI_MSI_FLAGS_QSIZE) >> 4;
+ pci_read_config_word(pdev, pdev->msi_cap + PCI_MSI_FLAGS, &msg_ctr);
+ msgvec = (msg_ctr & PCI_MSI_FLAGS_QSIZE) >> 4;
if (msgvec == 0)
msgvec = (msg_ctr & PCI_MSI_FLAGS_QMASK) >> 1;
if (msgvec > 5)
diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c
index 5a40516444f3..2f7c92c4757a 100644
--- a/drivers/pci/msi.c
+++ b/drivers/pci/msi.c
@@ -56,16 +56,6 @@ void __weak arch_teardown_msi_irq(unsigned int irq)
chip->teardown_irq(chip, irq);
}
-int __weak arch_msi_check_device(struct pci_dev *dev, int nvec, int type)
-{
- struct msi_chip *chip = dev->bus->msi;
-
- if (!chip || !chip->check_device)
- return 0;
-
- return chip->check_device(chip, dev, nvec, type);
-}
-
int __weak arch_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
{
struct msi_desc *entry;
@@ -130,7 +120,7 @@ static void default_restore_msi_irq(struct pci_dev *dev, int irq)
}
if (entry)
- write_msi_msg(irq, &entry->msg);
+ __write_msi_msg(entry, &entry->msg);
}
void __weak arch_restore_msi_irqs(struct pci_dev *dev)
@@ -384,17 +374,6 @@ static void free_msi_irqs(struct pci_dev *dev)
iounmap(entry->mask_base);
}
- /*
- * Its possible that we get into this path
- * When populate_msi_sysfs fails, which means the entries
- * were not registered with sysfs. In that case don't
- * unregister them.
- */
- if (entry->kobj.parent) {
- kobject_del(&entry->kobj);
- kobject_put(&entry->kobj);
- }
-
list_del(&entry->list);
kfree(entry);
}
@@ -595,7 +574,6 @@ static struct msi_desc *msi_setup_entry(struct pci_dev *dev)
entry->msi_attrib.entry_nr = 0;
entry->msi_attrib.maskbit = !!(control & PCI_MSI_FLAGS_MASKBIT);
entry->msi_attrib.default_irq = dev->irq; /* Save IOAPIC IRQ */
- entry->msi_attrib.pos = dev->msi_cap;
entry->msi_attrib.multi_cap = (control & PCI_MSI_FLAGS_QMASK) >> 1;
if (control & PCI_MSI_FLAGS_64BIT)
@@ -699,7 +677,6 @@ static int msix_setup_entries(struct pci_dev *dev, void __iomem *base,
entry->msi_attrib.is_64 = 1;
entry->msi_attrib.entry_nr = entries[i].entry;
entry->msi_attrib.default_irq = dev->irq;
- entry->msi_attrib.pos = dev->msix_cap;
entry->mask_base = base;
list_add_tail(&entry->list, &dev->msi_list);
@@ -806,23 +783,24 @@ out_free:
}
/**
- * pci_msi_check_device - check whether MSI may be enabled on a device
+ * 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 ?
- * @type: are we checking for MSI or MSI-X ?
*
* 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
- * supported return 0, else return an error code.
+ * supported return 1, else return 0.
**/
-static int pci_msi_check_device(struct pci_dev *dev, int nvec, int type)
+static int pci_msi_supported(struct pci_dev *dev, int nvec)
{
struct pci_bus *bus;
- int ret;
/* MSI must be globally enabled and supported by the device */
- if (!pci_msi_enable || !dev || dev->no_msi)
- return -EINVAL;
+ if (!pci_msi_enable)
+ return 0;
+
+ if (!dev || dev->no_msi || dev->current_state != PCI_D0)
+ return 0;
/*
* You can't ask to have 0 or less MSIs configured.
@@ -830,7 +808,7 @@ static int pci_msi_check_device(struct pci_dev *dev, int nvec, int type)
* b) the list manipulation code assumes nvec >= 1.
*/
if (nvec < 1)
- return -ERANGE;
+ return 0;
/*
* Any bridge which does NOT route MSI transactions from its
@@ -841,13 +819,9 @@ static int pci_msi_check_device(struct pci_dev *dev, int nvec, int type)
*/
for (bus = dev->bus; bus; bus = bus->parent)
if (bus->bus_flags & PCI_BUS_FLAGS_NO_MSI)
- return -EINVAL;
-
- ret = arch_msi_check_device(dev, nvec, type);
- if (ret)
- return ret;
+ return 0;
- return 0;
+ return 1;
}
/**
@@ -946,15 +920,14 @@ EXPORT_SYMBOL(pci_msix_vec_count);
**/
int pci_enable_msix(struct pci_dev *dev, struct msix_entry *entries, int nvec)
{
- int status, nr_entries;
+ int nr_entries;
int i, j;
- if (!entries || !dev->msix_cap || dev->current_state != PCI_D0)
+ if (!pci_msi_supported(dev, nvec))
return -EINVAL;
- status = pci_msi_check_device(dev, nvec, PCI_CAP_ID_MSIX);
- if (status)
- return status;
+ if (!entries)
+ return -EINVAL;
nr_entries = pci_msix_vec_count(dev);
if (nr_entries < 0)
@@ -978,8 +951,7 @@ int pci_enable_msix(struct pci_dev *dev, struct msix_entry *entries, int nvec)
dev_info(&dev->dev, "can't enable MSI-X (MSI IRQ already assigned)\n");
return -EINVAL;
}
- status = msix_capability_init(dev, entries, nvec);
- return status;
+ return msix_capability_init(dev, entries, nvec);
}
EXPORT_SYMBOL(pci_enable_msix);
@@ -1062,7 +1034,7 @@ int pci_enable_msi_range(struct pci_dev *dev, int minvec, int maxvec)
int nvec;
int rc;
- if (dev->current_state != PCI_D0)
+ if (!pci_msi_supported(dev, minvec))
return -EINVAL;
WARN_ON(!!dev->msi_enabled);
@@ -1086,17 +1058,6 @@ int pci_enable_msi_range(struct pci_dev *dev, int minvec, int maxvec)
nvec = maxvec;
do {
- rc = pci_msi_check_device(dev, nvec, PCI_CAP_ID_MSI);
- if (rc < 0) {
- return rc;
- } else if (rc > 0) {
- if (rc < minvec)
- return -ENOSPC;
- nvec = rc;
- }
- } while (rc);
-
- do {
rc = msi_capability_init(dev, nvec);
if (rc < 0) {
return rc;
diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c
index 76ef7914c9aa..92b6d9ab00e4 100644
--- a/drivers/pci/pci-sysfs.c
+++ b/drivers/pci/pci-sysfs.c
@@ -250,46 +250,45 @@ static ssize_t msi_bus_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct pci_dev *pdev = to_pci_dev(dev);
+ struct pci_bus *subordinate = pdev->subordinate;
- if (!pdev->subordinate)
- return 0;
-
- return sprintf(buf, "%u\n",
- !(pdev->subordinate->bus_flags & PCI_BUS_FLAGS_NO_MSI));
+ return sprintf(buf, "%u\n", subordinate ?
+ !(subordinate->bus_flags & PCI_BUS_FLAGS_NO_MSI)
+ : !pdev->no_msi);
}
static ssize_t msi_bus_store(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
struct pci_dev *pdev = to_pci_dev(dev);
+ struct pci_bus *subordinate = pdev->subordinate;
unsigned long val;
if (kstrtoul(buf, 0, &val) < 0)
return -EINVAL;
- /*
- * Bad things may happen if the no_msi flag is changed
- * while drivers are loaded.
- */
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
/*
- * Maybe devices without subordinate buses shouldn't have this
- * attribute in the first place?
+ * "no_msi" and "bus_flags" only affect what happens when a driver
+ * requests MSI or MSI-X. They don't affect any drivers that have
+ * already requested MSI or MSI-X.
*/
- if (!pdev->subordinate)
+ if (!subordinate) {
+ pdev->no_msi = !val;
+ dev_info(&pdev->dev, "MSI/MSI-X %s for future drivers\n",
+ val ? "allowed" : "disallowed");
return count;
-
- /* Is the flag going to change, or keep the value it already had? */
- if (!(pdev->subordinate->bus_flags & PCI_BUS_FLAGS_NO_MSI) ^
- !!val) {
- pdev->subordinate->bus_flags ^= PCI_BUS_FLAGS_NO_MSI;
-
- dev_warn(&pdev->dev, "forced subordinate bus to%s support MSI, bad things could happen\n",
- val ? "" : " not");
}
+ if (val)
+ subordinate->bus_flags &= ~PCI_BUS_FLAGS_NO_MSI;
+ else
+ subordinate->bus_flags |= PCI_BUS_FLAGS_NO_MSI;
+
+ dev_info(&subordinate->dev, "MSI/MSI-X %s for future drivers of devices on this bus\n",
+ val ? "allowed" : "disallowed");
return count;
}
static DEVICE_ATTR_RW(msi_bus);
generated by cgit v1.2.3-58-ga151 (git 2.39.0) at 2024-11-24 03:01:39 +0000