linux-kernel - RE: [PATCH] PCI: Mark AMD Raven iGPU ATS as broken

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Date:   Mon, 23 Nov 2020 21:04:14 +0000
From:   "Deucher, Alexander" <Alexander.Deucher@....com>
To:     Will Deacon <will@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        "iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Edgar Merger <Edgar.Merger@...rson.com>,
        Joerg Roedel <jroedel@...e.de>,
        "Kuehling, Felix" <Felix.Kuehling@....com>
Subject: RE: [PATCH] PCI: Mark AMD Raven iGPU ATS as broken

[AMD Public Use]

> -----Original Message-----
> From: Will Deacon <will@...nel.org>
> Sent: Monday, November 23, 2020 8:44 AM
> To: linux-kernel@...r.kernel.org
> Cc: linux-pci@...r.kernel.org; iommu@...ts.linux-foundation.org; Will
> Deacon <will@...nel.org>; Bjorn Helgaas <bhelgaas@...gle.com>;
> Deucher, Alexander <Alexander.Deucher@....com>; Edgar Merger
> <Edgar.Merger@...rson.com>; Joerg Roedel <jroedel@...e.de>
> Subject: [PATCH] PCI: Mark AMD Raven iGPU ATS as broken
> 
> Edgar Merger reports that the AMD Raven GPU does not work reliably on his
> system when the IOMMU is enabled:
> 
>   | [drm:amdgpu_job_timedout [amdgpu]] *ERROR* ring gfx timeout,
> signaled seq=1, emitted seq=3
>   | [...]
>   | amdgpu 0000:0b:00.0: GPU reset begin!
>   | AMD-Vi: Completion-Wait loop timed out
>   | iommu ivhd0: AMD-Vi: Event logged [IOTLB_INV_TIMEOUT
> device=0b:00.0 address=0x38edc0970]
> 
> This is indicative of a hardware/platform configuration issue so, since
> disabling ATS has been shown to resolve the problem, add a quirk to match
> this particular device while Edgar follows-up with AMD for more information.
> 
> Cc: Bjorn Helgaas <bhelgaas@...gle.com>
> Cc: Alex Deucher <alexander.deucher@....com>
> Reported-by: Edgar Merger <Edgar.Merger@...rson.com>
> Suggested-by: Joerg Roedel <jroedel@...e.de>
> Link:
> https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Flore.
> kernel.org%2Flinux-
> iommu%2FMWHPR10MB1310F042A30661D4158520B589FC0%40MWHPR10M
> B1310.namprd10.prod.outlook.com&amp;data=04%7C01%7Calexander.deuc
> her%40amd.com%7C1a883fe14d0c408e7d9508d88fb5df4e%7C3dd8961fe488
> 4e608e11a82d994e183d%7C0%7C0%7C637417358593629699%7CUnknown%7
> CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwi
> LCJXVCI6Mn0%3D%7C1000&amp;sdata=TMgKldWzsX8XZ0l7q3%2BszDWXQJJ
> LOUfX5oGaoLN8n%2B8%3D&amp;reserved=0
> Signed-off-by: Will Deacon <will@...nel.org>
> ---
> 
> Hi all,
> 
> Since Joerg is away at the moment, I'm posting this to try to make some
> progress with the thread in the Link: tag.

+ Felix

What system is this?  Can you provide more details?  Does a sbios update fix this?  Disabling ATS for all Ravens will break GPU compute for a lot of people.  I'd prefer to just black list this particular system (e.g., just SSIDs or revision) if possible.

Alex

> 
> Cheers,
> 
> Will
> 
>  drivers/pci/quirks.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c index
> f70692ac79c5..3911b0ec57ba 100644
> --- a/drivers/pci/quirks.c
> +++ b/drivers/pci/quirks.c
> @@ -5176,6 +5176,8 @@ DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_ATI,
> 0x6900, quirk_amd_harvest_no_ats);
> 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);
> +/* AMD Raven platform iGPU */
> +DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_ATI, 0x15d8,
> +quirk_amd_harvest_no_ats);
>  #endif /* CONFIG_PCI_ATS */
> 
>  /* Freescale PCIe doesn't support MSI in RC mode */
> --
> 2.29.2.454.gaff20da3a2-goog