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SubjectRe: [PATCH v3 2/7] PCI: Ignore enforced alignment to VF BARs
On Thu, Jun 30, 2016 at 06:53:08PM +0800, Yongji Xie wrote:
>VF BARs are read-only zeroes according to SRIOV spec,
>the normal way(writing BARs) of allocating resources wouldn't
>be applied to VFs. The VFs' resources would be allocated
>when we enable SR-IOV capability. So we should not try to
>reassign alignment after we enable VFs. It's meaningless
>and will release the allocated resources which leads to a bug.
>
>Signed-off-by: Yongji Xie <xyjxie@linux.vnet.ibm.com>
>---
> drivers/pci/pci.c | 4 ++++
> 1 file changed, 4 insertions(+)
>
>diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
>index be8f72c..6ae02de 100644
>--- a/drivers/pci/pci.c
>+++ b/drivers/pci/pci.c
>@@ -4822,6 +4822,10 @@ void pci_reassigndev_resource_alignment(struct pci_dev *dev)
> resource_size_t align, size;
> u16 command;
>
>+ /* We should never try to reassign VF's alignment */
>+ if (dev->is_virtfn)
>+ return;
>+

Yongji, I think it's correct to ignore VF's BARs. Another concern is:
it's safe to apply alignment to PF's IOV BARs? Lets have an extreme
example here: one PF has 16 VFs; each VF has only one 1KB. It means
the only PF IOV BAR is 16KB. I don't see how it works after expanding
it to 64KB which is the page size. It might be not a problem on PowerNV
platform, but potentially a issue on x86?

> /* check if specified PCI is target device to reassign */
> align = pci_specified_resource_alignment(dev);
> if (!align)

Thanks,
Gavin

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