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

[Will Deacon]

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@xxxxxxxxxx>
Cc: Alex Deucher <alexander.deucher@xxxxxxx>
Reported-by: Edgar Merger <Edgar.Merger@xxxxxxxxxxx>
Suggested-by: Joerg Roedel <jroedel@xxxxxxx>
Link: https://lore.kernel.org/linux-iommu/MWHPR10MB1310F042A30661D4158520B589FC0@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Signed-off-by: Will Deacon <will@xxxxxxxxxx>
---

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