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

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Message-Id: <20201123134410.10648-1-will@kernel.org>
Date:   Mon, 23 Nov 2020 13:44:10 +0000
From:   Will Deacon <will@...nel.org>
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>,
        Alex Deucher <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://lore.kernel.org/linux-iommu/MWHPR10MB1310F042A30661D4158520B589FC0@MWHPR10MB1310.namprd10.prod.outlook.com
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.

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