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| author | Ben Shelton <benjamin.h.shelton@intel.com> | 2015-10-29 22:20:31 +0100 |
|---|---|---|
| committer | Bjorn Helgaas <bhelgaas@google.com> | 2015-10-29 22:20:31 +0100 |
| commit | ff45f9ddbcf5418ff6402432d14ad91a40d9bea9 (patch) | |
| tree | bd79ba2cc8f0d5ca14777ce56b9f44aa17f23621 /drivers/pci/iov.c | |
| parent | PCI: Don't try to restore VF BARs (diff) | |
| download | linux-ff45f9ddbcf5418ff6402432d14ad91a40d9bea9.tar.xz linux-ff45f9ddbcf5418ff6402432d14ad91a40d9bea9.zip | |
PCI: Enable SR-IOV ARI Capable Hierarchy before reading TotalVFs
For some SR-IOV devices, the number of available virtual functions, i.e.,
TotalVFs, increases after setting the ARI Capable Hierarchy bit in the
SR-IOV Control register. This violates the SR-IOV spec, r1.1, sec 3.3.6,
which says TotalVFs is HwInit, but we don't need TotalVFs before setting
the ARI Capable bit anyway.
Set the ARI Capable Hierarchy bit (if ARI is enabled in the upstream
bridge) before reading TotalVFs.
[bhelgaas: changelog]
Signed-off-by: Ben Shelton <benjamin.h.shelton@intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Diffstat (limited to 'drivers/pci/iov.c')
| -rw-r--r-- | drivers/pci/iov.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/drivers/pci/iov.c b/drivers/pci/iov.c index ee0ebff103a4..0cdb2d1e1a20 100644 --- a/drivers/pci/iov.c +++ b/drivers/pci/iov.c @@ -399,10 +399,6 @@ static int sriov_init(struct pci_dev *dev, int pos) ssleep(1); } - pci_read_config_word(dev, pos + PCI_SRIOV_TOTAL_VF, &total); - if (!total) - return 0; - ctrl = 0; list_for_each_entry(pdev, &dev->bus->devices, bus_list) if (pdev->is_physfn) @@ -420,6 +416,10 @@ found: if (!offset || (total > 1 && !stride)) return -EIO; + pci_read_config_word(dev, pos + PCI_SRIOV_TOTAL_VF, &total); + if (!total) + return 0; + pci_read_config_dword(dev, pos + PCI_SRIOV_SUP_PGSIZE, &pgsz); i = PAGE_SHIFT > 12 ? PAGE_SHIFT - 12 : 0; pgsz &= ~((1 << i) - 1); |