drm/sched: Fix outdated comments referencing thread

The GPU scheduler's comments refer to a "thread" at various places.
Those are leftovers from commit a6149f0393 ("drm/sched: Convert drm
scheduler to use a work queue rather than kthread").

Replace all references to kthreads.

Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@igalia.com>
Signed-off-by: Philipp Stanner <phasta@kernel.org>
Link: https://lore.kernel.org/r/20250314101023.111248-2-phasta@kernel.org

drivers/gpu/drm/scheduler/sched_entity.c

@@ -545,10 +545,10 @@ void drm_sched_entity_select_rq(struct drm_sched_entity *entity)
 		return;
 
 	/*
-	 * Only when the queue is empty are we guaranteed that the scheduler
-	 * thread cannot change ->last_scheduled. To enforce ordering we need
-	 * a read barrier here. See drm_sched_entity_pop_job() for the other
-	 * side.
+	 * Only when the queue is empty are we guaranteed that
+	 * drm_sched_run_job_work() cannot change entity->last_scheduled. To
+	 * enforce ordering we need a read barrier here. See
+	 * drm_sched_entity_pop_job() for the other side.
 	 */
 	smp_rmb();
 

drivers/gpu/drm/scheduler/sched_main.c

@@ -391,7 +391,7 @@ static void drm_sched_run_free_queue(struct drm_gpu_scheduler *sched)
  * drm_sched_job_done - complete a job
  * @s_job: pointer to the job which is done
  *
- * Finish the job's fence and wake up the worker thread.
+ * Finish the job's fence and resubmit the work items.
  */
 static void drm_sched_job_done(struct drm_sched_job *s_job, int result)
 {
@@ -551,9 +551,10 @@ static void drm_sched_job_timedout(struct work_struct *work)
 
 	if (job) {
 		/*
-		 * Remove the bad job so it cannot be freed by concurrent
-		 * drm_sched_cleanup_jobs. It will be reinserted back after sched->thread
-		 * is parked at which point it's safe.
+		 * Remove the bad job so it cannot be freed by a concurrent
+		 * &struct drm_sched_backend_ops.free_job. It will be
+		 * reinserted after the scheduler's work items have been
+		 * cancelled, at which point it's safe.
 		 */
 		list_del_init(&job->list);
 		spin_unlock(&sched->job_list_lock);
@@ -599,10 +600,10 @@ void drm_sched_stop(struct drm_gpu_scheduler *sched, struct drm_sched_job *bad)
 
 	/*
 	 * Reinsert back the bad job here - now it's safe as
-	 * drm_sched_get_finished_job cannot race against us and release the
+	 * drm_sched_get_finished_job() cannot race against us and release the
 	 * bad job at this point - we parked (waited for) any in progress
-	 * (earlier) cleanups and drm_sched_get_finished_job will not be called
-	 * now until the scheduler thread is unparked.
+	 * (earlier) cleanups and drm_sched_get_finished_job() will not be
+	 * called now until the scheduler's work items are submitted again.
 	 */
 	if (bad && bad->sched == sched)
 		/*
@@ -615,7 +616,8 @@ void drm_sched_stop(struct drm_gpu_scheduler *sched, struct drm_sched_job *bad)
 	 * Iterate the job list from later to  earlier one and either deactive
 	 * their HW callbacks or remove them from pending list if they already
 	 * signaled.
-	 * This iteration is thread safe as sched thread is stopped.
+	 * This iteration is thread safe as the scheduler's work items have been
+	 * cancelled.
 	 */
 	list_for_each_entry_safe_reverse(s_job, tmp, &sched->pending_list,
 					 list) {
@@ -680,9 +682,9 @@ void drm_sched_start(struct drm_gpu_scheduler *sched, int errno)
 	struct drm_sched_job *s_job, *tmp;
 
 	/*
-	 * Locking the list is not required here as the sched thread is parked
-	 * so no new jobs are being inserted or removed. Also concurrent
-	 * GPU recovers can't run in parallel.
+	 * Locking the list is not required here as the scheduler's work items
+	 * are currently not running, so no new jobs are being inserted or
+	 * removed. Also concurrent GPU recovers can't run in parallel.
 	 */
 	list_for_each_entry_safe(s_job, tmp, &sched->pending_list, list) {
 		struct dma_fence *fence = s_job->s_fence->parent;

include/drm/gpu_scheduler.h

@@ -192,7 +192,7 @@ struct drm_sched_entity {
 	 * @last_scheduled:
 	 *
 	 * Points to the finished fence of the last scheduled job. Only written
-	 * by the scheduler thread, can be accessed locklessly from
+	 * by drm_sched_entity_pop_job(). Can be accessed locklessly from
 	 * drm_sched_job_arm() if the queue is empty.
 	 */
 	struct dma_fence __rcu		*last_scheduled;