[Bug 216455] New: PCI AER error caused by LTR enablement on amdgpu with LTR disabled on video card PCIe bridge

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=216455

            Bug ID: 216455
           Summary: PCI AER error caused by LTR enablement on amdgpu with
                    LTR disabled on video card PCIe bridge
           Product: Drivers
           Version: 2.5
    Kernel Version: 5.19.6
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri@kernel-bugs.osdl.org
          Reporter: wielkiegie@gmail.com
        Regression: No

Created attachment 301753
  --> https://bugzilla.kernel.org/attachment.cgi?id=301753&action=edit
dmesg with pci=earlydump (v5.19.5 + ltr debug patch)

Split off bug 216373 as this is a different issue than what it was initially
about.

To quote Bjorn:

> The issue you're seeing is an Unsupported Request error logged by a Switch
> Downstream Port when it received an LTR message sent by 44:00.0 when the
> Switch has LTR disabled:
>
>  pcieport 0000:43:00.0:   device [1022:1471] error
>  status/mask=00100000/00000000
>  pcieport 0000:43:00.0:    [20] UnsupReq               (First)
>  pcieport 0000:43:00.0: AER:   TLP Header: 34000000 44000010 00000000
>  84288428

The errors themselves can be masked by providing pci=noaer to the kernel.

The amdgpu.aspm=0 kernel option makes this issue disappear.

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