drm/amdgpu: introduce a kind of halt state for amdgpu device

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It is useful to maintain error context when debugging
SW/FW issues. Introduce amdgpu_device_halt() for this
purpose. It will bring hardware to a kind of halt state,
so that no one can touch it any more.

Compare to a simple hang, the system will keep stable
at least for SSH access. Then it should be trivial to
inspect the hardware state and see what's going on.

v2:
 - Set adev->no_hw_access earlier to avoid potential crashes.(Christian)

Suggested-by: Christian Koenig <christian.koenig@amd.com>
Suggested-by: Andrey Grodzovsky <andrey.grodzovsky@amd.com>
Signed-off-by: Lang Yu <lang.yu@amd.com>
Reviewed-by: Christian Koenig <christian.koenig@amd.co>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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Lang Yu 2021-12-09 15:10:32 +08:00 • committed by Alex Deucher

parent cace4bff75

commit 34f3a4a98b

2 changed files with 41 additions and 0 deletions

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2

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

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39

drivers/gpu/drm/amd/amdgpu/amdgpu_device.c

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