ACK/Cmnt: [PATCH 1/1] PCI: Mark AMD Navi10 GPU rev 0x00 ATS as broken

[Stefan Bader]

On 04.08.20 18:08, Kai-Heng Feng wrote:
> BugLink: https://bugs.launchpad.net/bugs/1890306
> 
> We are seeing AMD Radeon Pro W5700 doesn't work when IOMMU is enabled:
> 
>   iommu ivhd0: AMD-Vi: Event logged [IOTLB_INV_TIMEOUT device=63:00.0 address=0x42b5b01a0]
>   iommu ivhd0: AMD-Vi: Event logged [IOTLB_INV_TIMEOUT device=63:00.0 address=0x42b5b01c0]
> 
> The error also makes graphics driver fail to probe the device.
> 
> It appears to be the same issue as commit 5e89cd303e3a ("PCI: Mark AMD
> Navi14 GPU rev 0xc5 ATS as broken") addresses, and indeed the same ATS
> quirk can workaround the issue.
> 
> See-also: 5e89cd303e3a ("PCI: Mark AMD Navi14 GPU rev 0xc5 ATS as broken")
> See-also: d28ca864c493 ("PCI: Mark AMD Stoney Radeon R7 GPU ATS as broken")
> See-also: 9b44b0b09dec ("PCI: Mark AMD Stoney GPU ATS as broken")
> Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=208725
> Link: https://lore.kernel.org/r/20200728104554.28927-1-kai.heng.feng@canonical.com
> Signed-off-by: Kai-Heng Feng <kai.heng.feng at canonical.com>
> Signed-off-by: Bjorn Helgaas <bhelgaas at google.com>
> Acked-by: Alex Deucher <alexander.deucher at amd.com>
> Cc: stable at vger.kernel.org
> (cherry picked from commit 45beb31d3afb651bb5c41897e46bd4fa9980c51c linux-next)
> Signed-off-by: Kai-Heng Feng <kai.heng.feng at canonical.com>
Acked-by: Stefan Bader <stefan.bader at canonical.com>
> ---

Regression Potential as it is described in the SRU documentation
(https://wiki.ubuntu.com/StableReleaseUpdates/#SRU_Bug_Template)
probably should be:

Modifications are limited to a specific model of graphics card. Worst case there
might be some functionality not working as expected. Which, compared to not
working at all, would not be a regression.

-Stefan

>  drivers/pci/quirks.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
> index 3ee66e7c5a14..63e6f98fcd9c 100644
> --- a/drivers/pci/quirks.c
> +++ b/drivers/pci/quirks.c
> @@ -5230,7 +5230,8 @@ DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_SERVERWORKS, 0x0422, quirk_no_ext_tags);
>   */
>  static void quirk_amd_harvest_no_ats(struct pci_dev *pdev)
>  {
> -	if (pdev->device == 0x7340 && pdev->revision != 0xc5)
> +	if ((pdev->device == 0x7312 && pdev->revision != 0x00) ||
> +	    (pdev->device == 0x7340 && pdev->revision != 0xc5))
>  		return;
>  
>  	pci_info(pdev, "disabling ATS\n");
> @@ -5241,6 +5242,8 @@ static void quirk_amd_harvest_no_ats(struct pci_dev *pdev)
>  DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_ATI, 0x98e4, quirk_amd_harvest_no_ats);
>  /* AMD Iceland dGPU */
>  DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_ATI, 0x6900, quirk_amd_harvest_no_ats);
> +/* AMD Navi10 dGPU */
> +DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_ATI, 0x7312, quirk_amd_harvest_no_ats);
>  /* AMD Navi14 dGPU */
>  DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_ATI, 0x7340, quirk_amd_harvest_no_ats);
>  #endif /* CONFIG_PCI_ATS */
> 


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