diff options
| author | Bjorn Helgaas <bhelgaas@google.com> | 2017-03-17 00:48:24 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-03-22 12:43:37 +0100 |
| commit | 3d58444dea81ba0556ffcb356a19fc2d224d4eac (patch) | |
| tree | f551e4d46fcf8e30baf1e49cd43027e7746391cc /drivers/pci | |
| parent | 74cce811a4b60d64c5c30496f326ecd18a72a6b2 (diff) | |
| download | linux-rt-3d58444dea81ba0556ffcb356a19fc2d224d4eac.tar.gz | |
PCI: Ignore BAR updates on virtual functions
[ Upstream commit 63880b230a4af502c56dde3d4588634c70c66006 ]
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 70675e0b6a1a ("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>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/pci')
| -rw-r--r-- | drivers/pci/pci.c | 4 | ||||
| -rw-r--r-- | drivers/pci/setup-res.c | 5 |
2 files changed, 2 insertions, 7 deletions
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index 1fc2cf4b5ab6..6922964e3dff 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -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); } diff --git a/drivers/pci/setup-res.c b/drivers/pci/setup-res.c index 8a7322c4775d..4bc589ee78d0 100644 --- a/drivers/pci/setup-res.c +++ b/drivers/pci/setup-res.c @@ -34,10 +34,9 @@ static void pci_std_update_resource(struct pci_dev *dev, int resno) int reg; 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 |