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PCI: Ignore BAR updates on virtual functions 

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.

We already ignore these updates because of 70675e0b6a ("PCI: Don't try to
restore VF BARs"); this merely restructures it slightly to make it easier
to split updates for standard and SR-IOV BARs.

Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
This commit is contained in:
Bjorn Helgaas 2016-11-28 11:19:27 -06:00
parent f40ec3c748
commit 63880b230a
2 changed files with 2 additions and 7 deletions
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4
drivers/pci/pci.c
View File

@ -564,10 +564,6 @@ 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

@ -36,10 +36,9 @@ 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);
/* Per SR-IOV spec 3.4.1.11, VF BARs are RO zero */
if (dev->is_virtfn)
return;
}
/*
* Ignore resources for unimplemented BARs and unused resource slots