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PCI/IOV: Skip BAR sizing for VFs 

Per PCIe r4.0, sec 9.3.4.1.11, the BAR registers in VF config space are all
RO Zero, so skip sizing them.

This is an optimization when enabling SR-IOV on a device with many VFs.

Suggested-by: Bjorn Helgaas <bhelgaas@google.com>
Signed-off-by: KarimAllah Ahmed <karahmed@amazon.de>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
This commit is contained in:
KarimAllah Ahmed 2018-03-03 05:33:10 +01:00 committed by Bjorn Helgaas
parent be20f6b063
commit bf4447fd1c
1 changed files with 4 additions and 0 deletions
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4
drivers/pci/probe.c
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@ -329,6 +329,10 @@ static void pci_read_bases(struct pci_dev *dev, unsigned int howmany, int rom)
if (dev->non_compliant_bars)
return;
/* Per PCIe r4.0, sec 9.3.4.1.11, the VF BARs are all RO Zero */
if (dev->is_virtfn)
return;
for (pos = 0; pos < howmany; pos++) {
struct resource *res = &dev->resource[pos];
reg = PCI_BASE_ADDRESS_0 + (pos << 2);