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PCI: Add dev_flags bit to access VPD through function 0

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Add a dev_flags bit, PCI_DEV_FLAGS_VPD_REF_F0, to access VPD through
function 0 to provide VPD access on other functions.  This is for hardware
devices that provide copies of the same VPD capability registers in
multiple functions.  Because the kernel expects that each function has its
own registers, both the locking and the state tracking are affected by VPD
accesses to different functions.

On such devices for example, if a VPD write is performed on function 0,
*any* later attempt to read VPD from any other function of that device will
hang.  This has to do with how the kernel tracks the expected value of the
F bit per function.

Concurrent accesses to different functions of the same device can not only
hang but also corrupt both read and write VPD data.

When hangs occur, typically the error message:

  vpd r/w failed.  This is likely a firmware bug on this device.

will be seen.

Never set this bit on function 0 or there will be an infinite recursion.

Signed-off-by: Mark Rustad <mark.d.rustad@intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Alexander Duyck <alexander.h.duyck@redhat.com>
CC: stable@vger.kernel.org
This commit is contained in:
Mark Rustad 2015-07-13 11:40:02 -07:00 committed by Bjorn Helgaas
parent 113e0d118a
commit 932c435cab
2 changed files with 62 additions and 1 deletions
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61
drivers/pci/access.c
View File

@ -439,6 +439,56 @@ static const struct pci_vpd_ops pci_vpd_pci22_ops = {
.release = pci_vpd_pci22_release,
};
static ssize_t pci_vpd_f0_read(struct pci_dev *dev, loff_t pos, size_t count,
void *arg)
{
struct pci_dev *tdev = pci_get_slot(dev->bus, PCI_SLOT(dev->devfn));
ssize_t ret;
if (!tdev)
return -ENODEV;
ret = pci_read_vpd(tdev, pos, count, arg);
pci_dev_put(tdev);
return ret;
}
static ssize_t pci_vpd_f0_write(struct pci_dev *dev, loff_t pos, size_t count,
const void *arg)
{
struct pci_dev *tdev = pci_get_slot(dev->bus, PCI_SLOT(dev->devfn));
ssize_t ret;
if (!tdev)
return -ENODEV;
ret = pci_write_vpd(tdev, pos, count, arg);
pci_dev_put(tdev);
return ret;
}
static const struct pci_vpd_ops pci_vpd_f0_ops = {
.read = pci_vpd_f0_read,
.write = pci_vpd_f0_write,
.release = pci_vpd_pci22_release,
};
static int pci_vpd_f0_dev_check(struct pci_dev *dev)
{
struct pci_dev *tdev = pci_get_slot(dev->bus, PCI_SLOT(dev->devfn));
int ret = 0;
if (!tdev)
return -ENODEV;
if (!tdev->vpd || !tdev->multifunction ||
dev->class != tdev->class || dev->vendor != tdev->vendor ||
dev->device != tdev->device)
ret = -ENODEV;
pci_dev_put(tdev);
return ret;
}
int pci_vpd_pci22_init(struct pci_dev *dev)
{
struct pci_vpd_pci22 *vpd;
@ -447,12 +497,21 @@ int pci_vpd_pci22_init(struct pci_dev *dev)
cap = pci_find_capability(dev, PCI_CAP_ID_VPD);
if (!cap)
return -ENODEV;
if (dev->dev_flags & PCI_DEV_FLAGS_VPD_REF_F0) {
int ret = pci_vpd_f0_dev_check(dev);
if (ret)
return ret;
}
vpd = kzalloc(sizeof(*vpd), GFP_ATOMIC);
if (!vpd)
return -ENOMEM;
vpd->base.len = PCI_VPD_PCI22_SIZE;
vpd->base.ops = &pci_vpd_pci22_ops;
if (dev->dev_flags & PCI_DEV_FLAGS_VPD_REF_F0)
vpd->base.ops = &pci_vpd_f0_ops;
else
vpd->base.ops = &pci_vpd_pci22_ops;
mutex_init(&vpd->lock);
vpd->cap = cap;
vpd->busy = false;

2
include/linux/pci.h
View File

@ -180,6 +180,8 @@ enum pci_dev_flags {
PCI_DEV_FLAGS_NO_BUS_RESET = (__force pci_dev_flags_t) (1 << 6),
/* Do not use PM reset even if device advertises NoSoftRst- */
PCI_DEV_FLAGS_NO_PM_RESET = (__force pci_dev_flags_t) (1 << 7),
/* Get VPD from function 0 VPD */
PCI_DEV_FLAGS_VPD_REF_F0 = (__force pci_dev_flags_t) (1 << 8),
};
enum pci_irq_reroute_variant {