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drm/amdgpu: completely rework eviction fence handling v2

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Well that was broken on multiple levels.

First of all a lot of checks were placed at incorrect locations, especially if
the resume worker should run or not.

Then a bunch of code was just mid-layering because of incorrect assignment who
should do what.

And finally comments explaining what happens instead of why.

Just re-write it from scratch, that should at least fix some of the hangs we
are seeing.

Use RCU for the eviction fence pointer in the manager, the spinlock usage was
mostly incorrect as well. Then finally remove all the nonsense checks and
actually add them in the correct locations.

v2: some typo fixes and cleanups suggested by Sunil

Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Sunil Khatri <sunil.khatri@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Christian König
2026-01-28 13:58:14 +01:00
committed by Alex Deucher
parent 87327658c8
commit 2cd7284ba5
7 changed files with 113 additions and 209 deletions
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2
drivers/gpu/drm/amd/amdgpu/amdgpu_userq.h
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@@ -133,7 +133,7 @@ void amdgpu_userq_destroy_object(struct amdgpu_userq_mgr *uq_mgr,
struct amdgpu_userq_obj *userq_obj);
void amdgpu_userq_evict(struct amdgpu_userq_mgr *uq_mgr,
struct amdgpu_eviction_fence *ev_fence);
bool schedule_resume);
void amdgpu_userq_ensure_ev_fence(struct amdgpu_userq_mgr *userq_mgr,
struct amdgpu_eviction_fence_mgr *evf_mgr);