diff options
| author |   KarimAllah Ahmed <karahmed@amazon.de> | 2018-10-11 11:49:58 -0500 |
|---|---|---|
| committer |   Bjorn Helgaas <bhelgaas@google.com> | 2018-10-11 11:49:58 -0500 |
| commit | 975bb8b4dc93364bb47fcdb58812fa6cb0accc81 (patch) | |
| tree | 81e0b3d0c225d7572f9cb92990b8f6717730bb1f /drivers/pci/iov.c | |
| parent | Linux 4.19-rc4 (diff) | |
| download | linux-dev-975bb8b4dc93364bb47fcdb58812fa6cb0accc81.tar.xz linux-dev-975bb8b4dc93364bb47fcdb58812fa6cb0accc81.zip | |
PCI/IOV: Use VF0 cached config space size for other VFs
Cache the config space size from VF0 and use it for all other VFs instead
of reading it from the config space of each VF. We assume that it will be
the same across all associated VFs.
This is an optimization when enabling SR-IOV on a device with many VFs.
Signed-off-by: KarimAllah Ahmed <karahmed@amazon.de>
[bhelgaas: use CONFIG_PCI_IOV (not CONFIG_PCI_ATS)]
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Diffstat (limited to 'drivers/pci/iov.c')
| -rw-r--r-- | drivers/pci/iov.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/pci/iov.c b/drivers/pci/iov.c index c5f3cd4ed766..4238b539f9d8 100644 --- a/drivers/pci/iov.c +++ b/drivers/pci/iov.c @@ -133,6 +133,8 @@ static void pci_read_vf_config_common(struct pci_dev *virtfn) &physfn->sriov->subsystem_vendor); pci_read_config_word(virtfn, PCI_SUBSYSTEM_ID, &physfn->sriov->subsystem_device); + + physfn->sriov->cfg_size = pci_cfg_space_size(virtfn); } int pci_iov_add_virtfn(struct pci_dev *dev, int id) |