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| author | Wei Yang <weiyang@linux.vnet.ibm.com> | 2015-03-25 11:23:47 +0300 |
|---|---|---|
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2015-03-31 05:02:36 +0300 |
| commit | 4449f079722c86d2f6925da039835acdd8e973a8 (patch) | |
| tree | 52eafc1494e73fb9a1b630a50cd8b15f339cac78 /drivers/pci/pci.h | |
| parent | f59dca27d20c73500c4a88ab9a077e40669755db (diff) | |
| download | linux-4449f079722c86d2f6925da039835acdd8e973a8.tar.xz | |
PCI: Calculate maximum number of buses required for VFs
An SR-IOV device can change its First VF Offset and VF Stride based on the
values of ARI Capable Hierarchy and NumVFs. The number of buses required
for all VFs is determined by NumVFs, First VF Offset, and VF Stride (see
SR-IOV spec r1.1, sec 2.1.2).
Previously pci_iov_bus_range() computed how many buses would be required by
TotalVFs, but this was based on a single NumVFs value and may not have been
the maximum for all NumVFs configurations.
Iterate over all valid NumVFs and calculate the maximum number of bus
numbers that could ever be required for VFs of this device.
[bhelgaas: changelog, compute busnr of NumVFs, not TotalVFs, remove
kerenl-doc comment marker]
Signed-off-by: Wei Yang <weiyang@linux.vnet.ibm.com>
Acked-by: Bjorn Helgaas <bhelgaas@google.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'drivers/pci/pci.h')
| -rw-r--r-- | drivers/pci/pci.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h index 57329645dd01..bae593c04541 100644 --- a/drivers/pci/pci.h +++ b/drivers/pci/pci.h @@ -243,6 +243,7 @@ struct pci_sriov { u16 stride; /* following VF stride */ u32 pgsz; /* page size for BAR alignment */ u8 link; /* Function Dependency Link */ + u8 max_VF_buses; /* max buses consumed by VFs */ u16 driver_max_VFs; /* max num VFs driver supports */ struct pci_dev *dev; /* lowest numbered PF */ struct pci_dev *self; /* this PF */ |