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PCI: Don't try to restore VF BARs

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VF BARs are read-only zero, so updating VF BARs will not have any effect.
See the SR-IOV spec r1.1, sec 3.4.1.11.

Don't update VF BARs in pci_restore_bars().

This avoids spurious "BAR %d: error updating" messages that we see when
doing vfio pass-through after 6eb7018705 ("vfio-pci: Move idle devices to
D3hot power state").

[bhelgaas: changelog, fix whitespace]
Signed-off-by: Wei Yang <weiyang@linux.vnet.ibm.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
This commit is contained in:
Wei Yang 2015-07-29 16:52:58 +08:00 committed by Bjorn Helgaas
parent 6ff33f3902
commit 70675e0b6a
2 changed files with 10 additions and 1 deletions
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6
drivers/pci/pci.c
View file

@ -484,7 +484,7 @@ int pci_wait_for_pending(struct pci_dev *dev, int pos, u16 mask)
}
/**
* pci_restore_bars - restore a devices BAR values (e.g. after wake-up)
* pci_restore_bars - restore a device's BAR values (e.g. after wake-up)
* @dev: PCI device to have its BARs restored
*
* Restore the BAR values for a given device, so as to make it
@ -494,6 +494,10 @@ static void pci_restore_bars(struct pci_dev *dev)
{
int i;
/* Per SR-IOV spec 3.4.1.11, VF BARs are RO zero */
if (dev->is_virtfn)
return;
for (i = 0; i < PCI_BRIDGE_RESOURCES; i++)
pci_update_resource(dev, i);
}

5
drivers/pci/setup-res.c
View file

@ -36,6 +36,11 @@ void pci_update_resource(struct pci_dev *dev, int resno)
enum pci_bar_type type;
struct resource *res = dev->resource + resno;
if (dev->is_virtfn) {
dev_warn(&dev->dev, "can't update VF BAR%d\n", resno);
return;
}
/*
* Ignore resources for unimplemented BARs and unused resource slots
* for 64 bit BARs.