TWIMC: this mail is primarily send for documentation purposes and for regzbot, my Linux kernel regression tracking bot. These mails usually contain '#forregzbot' in the subject, to make them easy to spot and filter. [TLDR: I'm adding this regression report to the list of tracked regressions; all text from me you find below is based on a few templates paragraphs you might have encountered already already in similar form.] Hi, this is your Linux kernel regression tracker. On 18.08.22 22:38, Bjorn Helgaas wrote: > [Adding amdgpu folks] > > On Wed, Aug 17, 2022 at 11:45:15PM +0000, bugzilla-daemon@xxxxxxxxxx wrote: >> https://bugzilla.kernel.org/show_bug.cgi?id=216373 >> >> Bug ID: 216373 >> Summary: Uncorrected errors reported for AMD GPU >> Kernel Version: v6.0-rc1 >> Regression: No >> ... > > I marked this as a regression in bugzilla. > >> Hardware: >> CPU: Intel i7-12700K (Alder Lake) >> GPU: AMD RX 6700 XT [1002:73df] >> Motherboard: ASUS Prime Z690-A >> >> Problem: >> After upgrading to v6.0-rc1 the kernel is now reporting uncorrected PCI errors >> for my GPU. > > Thank you very much for the report and for taking the trouble to > bisect it and test Kai-Heng's patch! > > I suspect that booting with "pci=noaer" should be a temporary > workaround for this issue. If it, can you add that to the bugzilla > for anybody else who trips over this? > >> I have bisected this issue to: [8795e182b02dc87e343c79e73af6b8b7f9c5e635] >> PCI/portdrv: Don't disable AER reporting in get_port_device_capability() >> Reverting that commit causes the errors to cease. > > I suspect the errors still occur, but we just don't notice and log > them. > >> I have also tried Kai-Heng Feng's patch[1] which seems to resolve a similar >> problem, but it did not fix my issue. >> >> [1] >> https://lore.kernel.org/linux-pci/20220706123244.18056-1-kai.heng.feng@xxxxxxxxxxxxx/ >> >> dmesg snippet: >> >> pcieport 0000:00:01.0: AER: Multiple Uncorrected (Non-Fatal) error received: >> 0000:03:00.0 >> amdgpu 0000:03:00.0: PCIe Bus Error: severity=Uncorrected (Non-Fatal), >> type=Transaction Layer, (Requester ID) >> amdgpu 0000:03:00.0: device [1002:73df] error status/mask=00100000/00000000 >> amdgpu 0000:03:00.0: [20] UnsupReq (First) >> amdgpu 0000:03:00.0: AER: TLP Header: 40000001 0000000f 95e7f000 00000000 > > I think the TLP header decodes to: > > 0x40000001 = 0100 0000 ... 0000 0001 binary > 0x0000000f = 0000 0000 ... 0000 1111 binary > > Fmt 010b 3 DW header with data > Type 0000b 010 0 0000 MWr Memory Write Request > Length 00 0000 0001b 1 DW > Requester ID 0x0000 00:00.0 > Tag 0x00 > Last DW BE 0000b must be zero for 1 DW write > First DW BE 1111b all 4 bytes in DW enabled > Address 0x95e7f000 > Data 0x00000000 > > So I think this is a 32-bit write of zero to PCI bus address > 0x95e7f000. > > Your dmesg log says: > > pci 0000:02:00.0: PCI bridge to [bus 03] > pci 0000:02:00.0: bridge window [mem 0x95e00000-0x95ffffff] > pci 0000:03:00.0: reg 0x24: [mem 0x95e00000-0x95efffff] > [drm] register mmio base: 0x95E00000 > > So this looks like a write to the device's BAR 5. I don't see a PCI > reason why this should fail. Maybe there's some amdgpu reason? I'd like to add to the tracking to ensure it's not forgotten. #regzbot introduced: v5.19..v6.0-rc1 ^ https://bugzilla.kernel.org/show_bug.cgi?id=216373 #regzbot title: pci or amdgpu: Uncorrected errors reported for AMD GPU Ciao, Thorsten (wearing his 'the Linux kernel's regression tracker' hat) P.S.: As the Linux kernel's regression tracker I deal with a lot of reports and sometimes miss something important when writing mails like this. If that's the case here, don't hesitate to tell me in a public reply, it's in everyone's interest to set the public record straight.
