[PATCH 10/11] drm/scheduler: Don't store self-dependencies

[Daniel Vetter <daniel.vetter@ffwll.ch>]

This is essentially part of drm_sched_dependency_optimized(), which
only amdgpu seems to make use of. Use it a bit more.

Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Cc: "Christian König" <christian.koenig@amd.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Luben Tuikov <luben.tuikov@amd.com>
Cc: Andrey Grodzovsky <andrey.grodzovsky@amd.com>
Cc: Alex Deucher <alexander.deucher@amd.com>
Cc: Jack Zhang <Jack.Zhang1@amd.com>
---
 drivers/gpu/drm/scheduler/sched_main.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/gpu/drm/scheduler/sched_main.c b/drivers/gpu/drm/scheduler/sched_main.c
index 370c336d383f..c31d7cf7df74 100644
--- a/drivers/gpu/drm/scheduler/sched_main.c
+++ b/drivers/gpu/drm/scheduler/sched_main.c
@@ -649,6 +649,13 @@ int drm_sched_job_await_fence(struct drm_sched_job *job,
 	if (!fence)
 		return 0;
 
+	/* if it's a fence from us it's guaranteed to be earlier */
+	if (fence->context == job->entity->fence_context ||
+	    fence->context == job->entity->fence_context + 1) {
+		dma_fence_put(fence);
+		return 0;
+	}
+
 	/* Deduplicate if we already depend on a fence from the same context.
 	 * This lets the size of the array of deps scale with the number of
 	 * engines involved, rather than the number of BOs.
-- 
2.32.0.rc2