[Bug 216373] New: Uncorrected errors reported for AMD GPU

[Bjorn Helgaas]

On Fri, Aug 19, 2022 at 12:13:03PM -0500, Bjorn Helgaas wrote:
> On Thu, Aug 18, 2022 at 03:38:12PM -0500, Bjorn Helgaas wrote:
> > [Adding amdgpu folks]
> > 
> > On Wed, Aug 17, 2022 at 11:45:15PM +0000, bugzilla-daemon at kernel.org 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
> 
> Tom, thanks for trying out "pci=noaer".  Hopefully we won't need the
> workaround for long.
> 
> Could I trouble you to try the debug patch below and see if we get any
> stack trace clues in dmesg when the error happens?  I'm sure the
> experts would have a better approach, but I'm amdgpu-illiterate, so 
> this is all I can do :)

Thanks for doing this, Tom!  For everybody else, Tom attached a dmesg
log to the bugzilla: https://bugzilla.kernel.org/attachment.cgi?id=301606

Lots of traces of the form:

  amdgpu_device_wreg.part.0.cold+0xb/0x17 [amdgpu]
  amdgpu_gart_invalidate_tlb+0x22/0x60 [amdgpu]
  gmc_v10_0_hw_init+0x44/0x180 [amdgpu]

  amdgpu_device_wreg.part.0.cold+0xb/0x17 [amdgpu]
  gmc_v10_0_hw_init+0xa8/0x180 [amdgpu]

  amdgpu_device_wreg.part.0.cold+0xb/0x17 [amdgpu]
  gmc_v10_0_flush_gpu_tlb+0x35/0x280 [amdgpu]
  amdgpu_gart_invalidate_tlb+0x46/0x60 [amdgpu]
  gmc_v10_0_hw_init+0x44/0x180 [amdgpu]

I tried connecting the dots but I gave up chasing all the function
pointers.