| Message ID | 20161129041429.21453.83322.stgit@bhelgaas-glaptop.roam.corp.google.com (mailing list archive) |
|---|---|
| State | Not Applicable |
| Headers | show |
On Mon, Nov 28, 2016 at 10:14:29PM -0600, Bjorn Helgaas wrote: >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> >CC: Wei Yang <richard.weiyang@gmail.com> Reviewed-by: Gavin Shan <gwshan@linux.vnet.ibm.com> >--- > drivers/pci/pci.c | 4 ---- > 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 ba34907..631eac2 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 66c4d8f..d2a32d8 100644 >--- a/drivers/pci/setup-res.c >+++ b/drivers/pci/setup-res.c >@@ -36,10 +36,9 @@ void pci_update_resource(struct pci_dev *dev, int resno) > enum pci_bar_type type; > 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 >
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index ba34907..631eac2 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 66c4d8f..d2a32d8 100644 --- a/drivers/pci/setup-res.c +++ b/drivers/pci/setup-res.c @@ -36,10 +36,9 @@ void pci_update_resource(struct pci_dev *dev, int resno) enum pci_bar_type type; 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
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> CC: Wei Yang <richard.weiyang@gmail.com> --- drivers/pci/pci.c | 4 ---- drivers/pci/setup-res.c | 5 ++--- 2 files changed, 2 insertions(+), 7 deletions(-)