From bcbdcf48469b062b6ee00b560b44de28f387d2e0 Mon Sep 17 00:00:00 2001 From: Sumit Semwal Date: Sat, 25 Mar 2017 21:48:11 +0530 Subject: PCI: Ignore BAR updates on virtual functions From: Bjorn Helgaas [ 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 Reviewed-by: Gavin Shan Signed-off-by: Sasha Levin Signed-off-by: Greg Kroah-Hartman Signed-off-by: Sumit Semwal Signed-off-by: Greg Kroah-Hartman --- drivers/pci/pci.c | 4 ---- drivers/pci/setup-res.c | 5 ++--- 2 files changed, 2 insertions(+), 7 deletions(-) (limited to 'drivers') diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index a01e6d5fedec..0e53488f8ec1 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -519,10 +519,6 @@ 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 032a6b1ea512..25062966cbfa 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 -- cgit v1.2.3