drm/sched: Fix entities with 0 rqs.

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Some blocks in amdgpu can have 0 rqs.

Job creation already fails with -ENOENT when entity->rq is NULL,
so jobs cannot be pushed. Without a rq there is no scheduler to
pop jobs, and rq selection already does the right thing with a
list of length 0.

So the operations we need to fix are:
  - Creation, do not set rq to rq_list[0] if the list can have length 0.
  - Do not flush any jobs when there is no rq.
  - On entity destruction handle the rq = NULL case.
  - on set_priority, do not try to change the rq if it is NULL.

Signed-off-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

...

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Bas Nieuwenhuizen 2019-01-30 02:53:19 +01:00 • committed by Alex Deucher

parent 7a5e0d9ab6

commit 1decbf6bb0

1 changed files with 26 additions and 13 deletions

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drivers/gpu/drm/scheduler/sched_entity.c

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