On 7/27/2023 3:25 PM, Jesse Zhang wrote: > From: Jesse Zhang <jesse.zhang@xxxxxxx> > > iGpu driver fail to read/write register by iommu when start X. > kernel: [ 433.296634] audit: type=1400 audit(1690403823.130:64): apparmor="DENIED" operation="capable" class="cap" > profile="/snap/snapd/19457/usr/lib/snapd/snap-confine" pid=12344 comm="snap-confine" capability=38 capname="perfmon" > kernel: [ 433.515795] amdgpu 0000:03:00.0: amdgpu: failed to write reg 28b4 wait reg 28c6 > kernel: [ 440.195492] amdgpu 0000:03:00.0: amdgpu: failed to write reg 28b4 wait reg 28c6 > kernel: [ 453.679611] amdgpu 0000:03:00.0: amdgpu: failed to write reg 1a6f4 wait reg 1a706 > kernel: [ 460.383490] amdgpu 0000:03:00.0: amdgpu: failed to write reg 1a6f4 wait reg 1a706 > > Link: https://gitlab.freedesktop.org/drm/amd/-/issues/2659 > > Disable address translation service, before detach device. > Do detach will clear the page table point or pasid table entries, > so all DMA requests from the device should be blocked before that. > > Signed-off-by: Jesse Zhang <Jesse.Zhang@xxxxxxx> Thanks Jesse for tracking down the issue. Patch looks good to me. Reviewed-by: Vasant Hegde <vasant.hegde@xxxxxxx> -Vasant
