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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: Christian König <christian.koenig@amd.com>
Bug: https://gitlab.freedesktop.org/drm/amd/-/issues/2113#note_1579296
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Acked-by: Luben Tuikov <luben.tuikov@amd.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20221014081553.114899-1-christian.koenig@amd.com
This commit is contained in:
Christian König 2022-10-07 09:51:13 +02:00
parent 4190e8bbcb
commit 7b476affcc
2 changed files with 11 additions and 1 deletions
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3
drivers/gpu/drm/scheduler/sched_entity.c
View File

@ -385,7 +385,8 @@ static bool drm_sched_entity_add_dependency_cb(struct drm_sched_entity *entity)
}
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

9
include/drm/gpu_scheduler.h
View File

@ -32,6 +32,15 @@
#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_gpu_scheduler;