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Re: [PATCH v3 2/7] PCI: Ignore enforced alignment to VF BARs

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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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[PATCH v3 0/7] PCI: Add support for enforcing all MMIO BARs not to share PAGE_SIZE Yongji Xie <xyjxie@linux.vnet.ibm.com> - 2016-06-30 13:00 +0200
  [PATCH v3 3/7] PCI: Do not disable memory decoding in pci_reassigndev_resource_alignment() Yongji Xie <xyjxie@linux.vnet.ibm.com> - 2016-06-30 13:00 +0200
    Re: [PATCH v3 3/7] PCI: Do not disable memory decoding in  pci_reassigndev_resource_alignment() Gavin Shan <gwshan@linux.vnet.ibm.com> - 2016-07-01 03:00 +0200
      Re: [PATCH v3 3/7] PCI: Do not disable memory decoding in  pci_reassigndev_resource_alignment() Yongji Xie <xyjxie@linux.vnet.ibm.com> - 2016-07-01 10:10 +0200
  [PATCH v3 1/7] PCI: Ignore enforced alignment when kernel uses existing firmware setup Yongji Xie <xyjxie@linux.vnet.ibm.com> - 2016-06-30 13:00 +0200
    Re: [PATCH v3 1/7] PCI: Ignore enforced alignment when kernel uses  existing firmware setup Gavin Shan <gwshan@linux.vnet.ibm.com> - 2016-07-01 02:30 +0200
      Re: [PATCH v3 1/7] PCI: Ignore enforced alignment when kernel uses  existing firmware setup Yongji Xie <xyjxie@linux.vnet.ibm.com> - 2016-07-01 06:50 +0200
  [PATCH v3 2/7] PCI: Ignore enforced alignment to VF BARs Yongji Xie <xyjxie@linux.vnet.ibm.com> - 2016-06-30 13:00 +0200
    Re: [PATCH v3 2/7] PCI: Ignore enforced alignment to VF BARs Gavin Shan <gwshan@linux.vnet.ibm.com> - 2016-07-01 02:50 +0200
      Re: [PATCH v3 2/7] PCI: Ignore enforced alignment to VF BARs Yongji Xie <xyjxie@linux.vnet.ibm.com> - 2016-07-01 07:30 +0200
        Re: [PATCH v3 2/7] PCI: Ignore enforced alignment to VF BARs Gavin Shan <gwshan@linux.vnet.ibm.com> - 2016-07-01 08:10 +0200
          Re: [PATCH v3 2/7] PCI: Ignore enforced alignment to VF BARs Yongji Xie <xyjxie@linux.vnet.ibm.com> - 2016-07-01 08:50 +0200
            Re: [PATCH v3 2/7] PCI: Ignore enforced alignment to VF BARs Gavin Shan <gwshan@linux.vnet.ibm.com> - 2016-07-02 02:40 +0200
  [PATCH v3 7/7] PCI: Add a macro to set default alignment for all PCI devices Yongji Xie <xyjxie@linux.vnet.ibm.com> - 2016-06-30 13:00 +0200
  [PATCH v3 4/7] PCI: Add a new option for resource_alignment to reassign alignment Yongji Xie <xyjxie@linux.vnet.ibm.com> - 2016-06-30 13:00 +0200
    Re: [PATCH v3 4/7] PCI: Add a new option for resource_alignment to  reassign alignment Gavin Shan <gwshan@linux.vnet.ibm.com> - 2016-07-01 05:40 +0200
      Re: [PATCH v3 4/7] PCI: Add a new option for resource_alignment to  reassign alignment Yongji Xie <xyjxie@linux.vnet.ibm.com> - 2016-07-01 09:00 +0200
  [PATCH v3 6/7] PCI: Add support for enforcing all MMIO BARs to be page aligned Yongji Xie <xyjxie@linux.vnet.ibm.com> - 2016-06-30 13:00 +0200
  [PATCH v3 5/7] PCI: Do not use IORESOURCE_STARTALIGN to identify bridge resources Yongji Xie <xyjxie@linux.vnet.ibm.com> - 2016-06-30 13:00 +0200
    Re: [PATCH v3 5/7] PCI: Do not use IORESOURCE_STARTALIGN to identify  bridge resources Gavin Shan <gwshan@linux.vnet.ibm.com> - 2016-07-01 04:40 +0200
      Re: [PATCH v3 5/7] PCI: Do not use IORESOURCE_STARTALIGN to identify  bridge resources Yongji Xie <xyjxie@linux.vnet.ibm.com> - 2016-07-01 09:10 +0200
        Re: [PATCH v3 5/7] PCI: Do not use IORESOURCE_STARTALIGN to identify  bridge resources Gavin Shan <gwshan@linux.vnet.ibm.com> - 2016-07-02 02:40 +0200

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