drm/amdgpu: workaround for TLB seq race

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It can happen that we query the sequence value before the callback
had a chance to run.

Workaround that by grabbing the fence lock and releasing it again.
Should be replaced by hw handling soon.

Signed-off-by: Christian König <christian.koenig@amd.com>
CC: stable@vger.kernel.org # 5.19+
Fixes: 5255e146c9 ("drm/amdgpu: rework TLB flushing")
Link: https://gitlab.freedesktop.org/drm/amd/-/issues/2113
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Acked-by: Philip Yang <Philip.Yang@amd.com>
Tested-by: Stefan Springer <stefanspr94@gmail.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

...

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Christian König 2022-11-02 14:55:13 +01:00 • committed by Alex Deucher

parent a0fba3e078

commit f9e6949645

1 changed files with 15 additions and 0 deletions

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drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h

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