drm/sched: implement and export drm_sched_pick_best
Remove drm_sched_entity_get_free_sched() and use the logic of picking
the least loaded drm scheduler from a drm scheduler list to implement
drm_sched_pick_best(). This patch also exports drm_sched_pick_best() so
that it can be utilized by other drm drivers.
Signed-off-by: Nirmoy Das <nirmoy.das@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
diff --git a/drivers/gpu/drm/scheduler/sched_entity.c b/drivers/gpu/drm/scheduler/sched_entity.c
index d631521..c803e14e 100644
--- a/drivers/gpu/drm/scheduler/sched_entity.c
+++ b/drivers/gpu/drm/scheduler/sched_entity.c
@@ -138,38 +138,6 @@ bool drm_sched_entity_is_ready(struct drm_sched_entity *entity)
}
/**
- * drm_sched_entity_get_free_sched - Get the rq from rq_list with least load
- *
- * @entity: scheduler entity
- *
- * Return the pointer to the rq with least load.
- */
-static struct drm_sched_rq *
-drm_sched_entity_get_free_sched(struct drm_sched_entity *entity)
-{
- struct drm_sched_rq *rq = NULL;
- unsigned int min_jobs = UINT_MAX, num_jobs;
- int i;
-
- for (i = 0; i < entity->num_sched_list; ++i) {
- struct drm_gpu_scheduler *sched = entity->sched_list[i];
-
- if (!entity->sched_list[i]->ready) {
- DRM_WARN("sched%s is not ready, skipping", sched->name);
- continue;
- }
-
- num_jobs = atomic_read(&sched->num_jobs);
- if (num_jobs < min_jobs) {
- min_jobs = num_jobs;
- rq = &entity->sched_list[i]->sched_rq[entity->priority];
- }
- }
-
- return rq;
-}
-
-/**
* drm_sched_entity_flush - Flush a context entity
*
* @entity: scheduler entity
@@ -479,6 +447,7 @@ struct drm_sched_job *drm_sched_entity_pop_job(struct drm_sched_entity *entity)
void drm_sched_entity_select_rq(struct drm_sched_entity *entity)
{
struct dma_fence *fence;
+ struct drm_gpu_scheduler *sched;
struct drm_sched_rq *rq;
if (spsc_queue_count(&entity->job_queue) || entity->num_sched_list <= 1)
@@ -489,7 +458,8 @@ void drm_sched_entity_select_rq(struct drm_sched_entity *entity)
return;
spin_lock(&entity->rq_lock);
- rq = drm_sched_entity_get_free_sched(entity);
+ sched = drm_sched_pick_best(entity->sched_list, entity->num_sched_list);
+ rq = sched ? &sched->sched_rq[entity->priority] : NULL;
if (rq != entity->rq) {
drm_sched_rq_remove_entity(entity->rq, entity);
entity->rq = rq;
diff --git a/drivers/gpu/drm/scheduler/sched_main.c b/drivers/gpu/drm/scheduler/sched_main.c
index f4ac38b..a18eabf 100644
--- a/drivers/gpu/drm/scheduler/sched_main.c
+++ b/drivers/gpu/drm/scheduler/sched_main.c
@@ -697,6 +697,42 @@ drm_sched_get_cleanup_job(struct drm_gpu_scheduler *sched)
}
/**
+ * drm_sched_pick_best - Get a drm sched from a sched_list with the least load
+ * @sched_list: list of drm_gpu_schedulers
+ * @num_sched_list: number of drm_gpu_schedulers in the sched_list
+ *
+ * Returns pointer of the sched with the least load or NULL if none of the
+ * drm_gpu_schedulers are ready
+ */
+struct drm_gpu_scheduler *
+drm_sched_pick_best(struct drm_gpu_scheduler **sched_list,
+ unsigned int num_sched_list)
+{
+ struct drm_gpu_scheduler *sched, *picked_sched = NULL;
+ int i;
+ unsigned int min_jobs = UINT_MAX, num_jobs;
+
+ for (i = 0; i < num_sched_list; ++i) {
+ sched = sched_list[i];
+
+ if (!sched->ready) {
+ DRM_WARN("scheduler %s is not ready, skipping",
+ sched->name);
+ continue;
+ }
+
+ num_jobs = atomic_read(&sched->num_jobs);
+ if (num_jobs < min_jobs) {
+ min_jobs = num_jobs;
+ picked_sched = sched;
+ }
+ }
+
+ return picked_sched;
+}
+EXPORT_SYMBOL(drm_sched_pick_best);
+
+/**
* drm_sched_blocked - check if the scheduler is blocked
*
* @sched: scheduler instance
