Commit 7b476aff authored by Christian König's avatar Christian König

drm/sched: add DRM_SCHED_FENCE_DONT_PIPELINE flag

Setting this flag on a scheduler fence prevents pipelining of jobs
depending on this fence. In other words we always insert a full CPU
round trip before dependent jobs are pushed to the pipeline.
Signed-off-by: default avatarChristian König <christian.koenig@amd.com>
Bug: https://gitlab.freedesktop.org/drm/amd/-/issues/2113#note_1579296Reviewed-by: default avatarAlex Deucher <alexander.deucher@amd.com>
Acked-by: default avatarLuben Tuikov <luben.tuikov@amd.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20221014081553.114899-1-christian.koenig@amd.com
parent 4190e8bb
...@@ -385,7 +385,8 @@ static bool drm_sched_entity_add_dependency_cb(struct drm_sched_entity *entity) ...@@ -385,7 +385,8 @@ static bool drm_sched_entity_add_dependency_cb(struct drm_sched_entity *entity)
} }
s_fence = to_drm_sched_fence(fence); s_fence = to_drm_sched_fence(fence);
if (s_fence && s_fence->sched == sched) { if (s_fence && s_fence->sched == sched &&
!test_bit(DRM_SCHED_FENCE_DONT_PIPELINE, &fence->flags)) {
/* /*
* Fence is from the same scheduler, only need to wait for * Fence is from the same scheduler, only need to wait for
......
...@@ -32,6 +32,15 @@ ...@@ -32,6 +32,15 @@
#define MAX_WAIT_SCHED_ENTITY_Q_EMPTY msecs_to_jiffies(1000) #define MAX_WAIT_SCHED_ENTITY_Q_EMPTY msecs_to_jiffies(1000)
/**
* DRM_SCHED_FENCE_DONT_PIPELINE - Prefent dependency pipelining
*
* Setting this flag on a scheduler fence prevents pipelining of jobs depending
* on this fence. In other words we always insert a full CPU round trip before
* dependen jobs are pushed to the hw queue.
*/
#define DRM_SCHED_FENCE_DONT_PIPELINE DMA_FENCE_FLAG_USER_BITS
struct drm_gem_object; struct drm_gem_object;
struct drm_gpu_scheduler; struct drm_gpu_scheduler;
......
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