linux-kernel - Re: [PATCH] PCI: Mark AMD Navi10 GPU rev 0x00 ATS as broken

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Message-ID: <20200729195808.GA1962849@bjorn-Precision-5520>
Date:   Wed, 29 Jul 2020 14:58:08 -0500
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     Kai-Heng Feng <kai.heng.feng@...onical.com>
Cc:     bhelgaas@...gle.com, Alex Deucher <alexander.deucher@....com>,
        "open list:PCI SUBSYSTEM" <linux-pci@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] PCI: Mark AMD Navi10 GPU rev 0x00 ATS as broken

On Tue, Jul 28, 2020 at 06:45:53PM +0800, Kai-Heng Feng wrote:
> We are seeing AMD Radeon Pro W5700 doesn't work when IOMMU is enabled:
> [    3.375841] iommu ivhd0: AMD-Vi: Event logged [IOTLB_INV_TIMEOUT device=63:00.0 address=0x42b5b01a0]
> [    3.375845] 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.
> 
> Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=208725
> Cc: Alex Deucher <alexander.deucher@....com>
> Signed-off-by: Kai-Heng Feng <kai.heng.feng@...onical.com>

Applied with Alex's ack to pci/virtualization for v5.9, thanks!

I also added a stable tag since we did that for 5e89cd303e3a.  Let me
know if you *don't* want that.

> ---
>  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 812bfc32ecb8..052efeb9f053 100644
> --- a/drivers/pci/quirks.c
> +++ b/drivers/pci/quirks.c
> @@ -5192,7 +5192,8 @@ 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");
> @@ -5203,6 +5204,8 @@ 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 */
> -- 
> 2.17.1
>