On Tue, Feb 10, 2015 at 11:36:24AM +1100, Benjamin Herrenschmidt wrote: >On Thu, 2015-01-15 at 10:27 +0800, Wei Yang wrote: >> If we're going to reassign resources with flag PCI_REASSIGN_ALL_RSRC, all >> resources will be cleaned out during device header fixup time and then get >> reassigned by PCI core. However, the VF resources won't be reassigned and >> thus, we shouldn't clean them out. >> >> This patch adds a condition. If the pci_dev is a VF, skip the resource >> unset process. > >I don't understand this, can you elaborate ? Why wouldn't we reassign >the IOV resource just like everything else ? Sure. VFs work a little bit different from normal devices. On powernv platform, we have PCI_REASSIGN_ALL_RSRC set, which means all resource retrieved from hardware will be cleaned and re-assigned by kernel. While VF's resources are calculated from PF's IOV BAR, in virtfn_add(). And after this, there is not re-assign process for VFs. > >Ben. > >> Signed-off-by: Wei Yang <weiyang@xxxxxxxxxxxxxxxxxx> >> --- >> arch/powerpc/kernel/pci-common.c | 4 ++++ >> 1 file changed, 4 insertions(+) >> >> diff --git a/arch/powerpc/kernel/pci-common.c b/arch/powerpc/kernel/pci-common.c >> index 37d512d..889f743 100644 >> --- a/arch/powerpc/kernel/pci-common.c >> +++ b/arch/powerpc/kernel/pci-common.c >> @@ -788,6 +788,10 @@ static void pcibios_fixup_resources(struct pci_dev *dev) >> pci_name(dev)); >> return; >> } >> + >> + if (dev->is_virtfn) >> + return; >> + >> for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) { >> struct resource *res = dev->resource + i; >> struct pci_bus_region reg; > -- Richard Yang Help you, Help me -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html