2 * Copyright 2015 Advanced Micro Devices, Inc.
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
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9 * Software is furnished to do so, subject to the following conditions:
11 * The above copyright notice and this permission notice shall be included in
12 * all copies or substantial portions of the Software.
14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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18 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
20 * OTHER DEALINGS IN THE SOFTWARE.
27 * The GPU scheduler provides entities which allow userspace to push jobs
28 * into software queues which are then scheduled on a hardware run queue.
29 * The software queues have a priority among them. The scheduler selects the entities
30 * from the run queue using a FIFO. The scheduler provides dependency handling
31 * features among jobs. The driver is supposed to provide callback functions for
32 * backend operations to the scheduler like submitting a job to hardware run queue,
33 * returning the dependencies of a job etc.
35 * The organisation of the scheduler is the following:
37 * 1. Each hw run queue has one scheduler
38 * 2. Each scheduler has multiple run queues with different priorities
39 * (e.g., HIGH_HW,HIGH_SW, KERNEL, NORMAL)
40 * 3. Each scheduler run queue has a queue of entities to schedule
41 * 4. Entities themselves maintain a queue of jobs that will be scheduled on
44 * The jobs in a entity are always scheduled in the order that they were pushed.
47 #include <linux/kthread.h>
48 #include <linux/wait.h>
49 #include <linux/sched.h>
50 #include <linux/completion.h>
51 #include <uapi/linux/sched/types.h>
53 #include <drm/drm_print.h>
54 #include <drm/gpu_scheduler.h>
55 #include <drm/spsc_queue.h>
57 #define CREATE_TRACE_POINTS
58 #include "gpu_scheduler_trace.h"
60 #define to_drm_sched_job(sched_job) \
61 container_of((sched_job), struct drm_sched_job, queue_node)
63 static void drm_sched_process_job(struct dma_fence *f, struct dma_fence_cb *cb);
66 * drm_sched_rq_init - initialize a given run queue struct
68 * @rq: scheduler run queue
70 * Initializes a scheduler runqueue.
72 static void drm_sched_rq_init(struct drm_gpu_scheduler *sched,
73 struct drm_sched_rq *rq)
75 spin_lock_init(&rq->lock);
76 INIT_LIST_HEAD(&rq->entities);
77 rq->current_entity = NULL;
82 * drm_sched_rq_add_entity - add an entity
84 * @rq: scheduler run queue
85 * @entity: scheduler entity
87 * Adds a scheduler entity to the run queue.
89 void drm_sched_rq_add_entity(struct drm_sched_rq *rq,
90 struct drm_sched_entity *entity)
92 if (!list_empty(&entity->list))
95 atomic_inc(&rq->sched->score);
96 list_add_tail(&entity->list, &rq->entities);
97 spin_unlock(&rq->lock);
101 * drm_sched_rq_remove_entity - remove an entity
103 * @rq: scheduler run queue
104 * @entity: scheduler entity
106 * Removes a scheduler entity from the run queue.
108 void drm_sched_rq_remove_entity(struct drm_sched_rq *rq,
109 struct drm_sched_entity *entity)
111 if (list_empty(&entity->list))
113 spin_lock(&rq->lock);
114 atomic_dec(&rq->sched->score);
115 list_del_init(&entity->list);
116 if (rq->current_entity == entity)
117 rq->current_entity = NULL;
118 spin_unlock(&rq->lock);
122 * drm_sched_rq_select_entity - Select an entity which could provide a job to run
124 * @rq: scheduler run queue to check.
126 * Try to find a ready entity, returns NULL if none found.
128 static struct drm_sched_entity *
129 drm_sched_rq_select_entity(struct drm_sched_rq *rq)
131 struct drm_sched_entity *entity;
133 spin_lock(&rq->lock);
135 entity = rq->current_entity;
137 list_for_each_entry_continue(entity, &rq->entities, list) {
138 if (drm_sched_entity_is_ready(entity)) {
139 rq->current_entity = entity;
140 reinit_completion(&entity->entity_idle);
141 spin_unlock(&rq->lock);
147 list_for_each_entry(entity, &rq->entities, list) {
149 if (drm_sched_entity_is_ready(entity)) {
150 rq->current_entity = entity;
151 reinit_completion(&entity->entity_idle);
152 spin_unlock(&rq->lock);
156 if (entity == rq->current_entity)
160 spin_unlock(&rq->lock);
166 * drm_sched_dependency_optimized
168 * @fence: the dependency fence
169 * @entity: the entity which depends on the above fence
171 * Returns true if the dependency can be optimized and false otherwise
173 bool drm_sched_dependency_optimized(struct dma_fence* fence,
174 struct drm_sched_entity *entity)
176 struct drm_gpu_scheduler *sched = entity->rq->sched;
177 struct drm_sched_fence *s_fence;
179 if (!fence || dma_fence_is_signaled(fence))
181 if (fence->context == entity->fence_context)
183 s_fence = to_drm_sched_fence(fence);
184 if (s_fence && s_fence->sched == sched)
189 EXPORT_SYMBOL(drm_sched_dependency_optimized);
192 * drm_sched_start_timeout - start timeout for reset worker
194 * @sched: scheduler instance to start the worker for
196 * Start the timeout for the given scheduler.
198 static void drm_sched_start_timeout(struct drm_gpu_scheduler *sched)
200 if (sched->timeout != MAX_SCHEDULE_TIMEOUT &&
201 !list_empty(&sched->ring_mirror_list))
202 schedule_delayed_work(&sched->work_tdr, sched->timeout);
206 * drm_sched_fault - immediately start timeout handler
208 * @sched: scheduler where the timeout handling should be started.
210 * Start timeout handling immediately when the driver detects a hardware fault.
212 void drm_sched_fault(struct drm_gpu_scheduler *sched)
214 mod_delayed_work(system_wq, &sched->work_tdr, 0);
216 EXPORT_SYMBOL(drm_sched_fault);
219 * drm_sched_suspend_timeout - Suspend scheduler job timeout
221 * @sched: scheduler instance for which to suspend the timeout
223 * Suspend the delayed work timeout for the scheduler. This is done by
224 * modifying the delayed work timeout to an arbitrary large value,
225 * MAX_SCHEDULE_TIMEOUT in this case.
227 * Returns the timeout remaining
230 unsigned long drm_sched_suspend_timeout(struct drm_gpu_scheduler *sched)
232 unsigned long sched_timeout, now = jiffies;
234 sched_timeout = sched->work_tdr.timer.expires;
237 * Modify the timeout to an arbitrarily large value. This also prevents
238 * the timeout to be restarted when new submissions arrive
240 if (mod_delayed_work(system_wq, &sched->work_tdr, MAX_SCHEDULE_TIMEOUT)
241 && time_after(sched_timeout, now))
242 return sched_timeout - now;
244 return sched->timeout;
246 EXPORT_SYMBOL(drm_sched_suspend_timeout);
249 * drm_sched_resume_timeout - Resume scheduler job timeout
251 * @sched: scheduler instance for which to resume the timeout
252 * @remaining: remaining timeout
254 * Resume the delayed work timeout for the scheduler.
256 void drm_sched_resume_timeout(struct drm_gpu_scheduler *sched,
257 unsigned long remaining)
259 spin_lock(&sched->job_list_lock);
261 if (list_empty(&sched->ring_mirror_list))
262 cancel_delayed_work(&sched->work_tdr);
264 mod_delayed_work(system_wq, &sched->work_tdr, remaining);
266 spin_unlock(&sched->job_list_lock);
268 EXPORT_SYMBOL(drm_sched_resume_timeout);
270 static void drm_sched_job_begin(struct drm_sched_job *s_job)
272 struct drm_gpu_scheduler *sched = s_job->sched;
274 spin_lock(&sched->job_list_lock);
275 list_add_tail(&s_job->list, &sched->ring_mirror_list);
276 drm_sched_start_timeout(sched);
277 spin_unlock(&sched->job_list_lock);
280 static void drm_sched_job_timedout(struct work_struct *work)
282 struct drm_gpu_scheduler *sched;
283 struct drm_sched_job *job;
285 sched = container_of(work, struct drm_gpu_scheduler, work_tdr.work);
287 /* Protects against concurrent deletion in drm_sched_get_cleanup_job */
288 spin_lock(&sched->job_list_lock);
289 job = list_first_entry_or_null(&sched->ring_mirror_list,
290 struct drm_sched_job, list);
294 * Remove the bad job so it cannot be freed by concurrent
295 * drm_sched_cleanup_jobs. It will be reinserted back after sched->thread
296 * is parked at which point it's safe.
298 list_del_init(&job->list);
299 spin_unlock(&sched->job_list_lock);
301 job->sched->ops->timedout_job(job);
304 * Guilty job did complete and hence needs to be manually removed
305 * See drm_sched_stop doc.
307 if (sched->free_guilty) {
308 job->sched->ops->free_job(job);
309 sched->free_guilty = false;
312 spin_unlock(&sched->job_list_lock);
315 spin_lock(&sched->job_list_lock);
316 drm_sched_start_timeout(sched);
317 spin_unlock(&sched->job_list_lock);
321 * drm_sched_increase_karma - Update sched_entity guilty flag
323 * @bad: The job guilty of time out
325 * Increment on every hang caused by the 'bad' job. If this exceeds the hang
326 * limit of the scheduler then the respective sched entity is marked guilty and
327 * jobs from it will not be scheduled further
329 void drm_sched_increase_karma(struct drm_sched_job *bad)
332 struct drm_sched_entity *tmp;
333 struct drm_sched_entity *entity;
334 struct drm_gpu_scheduler *sched = bad->sched;
336 /* don't increase @bad's karma if it's from KERNEL RQ,
337 * because sometimes GPU hang would cause kernel jobs (like VM updating jobs)
338 * corrupt but keep in mind that kernel jobs always considered good.
340 if (bad->s_priority != DRM_SCHED_PRIORITY_KERNEL) {
341 atomic_inc(&bad->karma);
342 for (i = DRM_SCHED_PRIORITY_MIN; i < DRM_SCHED_PRIORITY_KERNEL;
344 struct drm_sched_rq *rq = &sched->sched_rq[i];
346 spin_lock(&rq->lock);
347 list_for_each_entry_safe(entity, tmp, &rq->entities, list) {
348 if (bad->s_fence->scheduled.context ==
349 entity->fence_context) {
350 if (atomic_read(&bad->karma) >
351 bad->sched->hang_limit)
353 atomic_set(entity->guilty, 1);
357 spin_unlock(&rq->lock);
358 if (&entity->list != &rq->entities)
363 EXPORT_SYMBOL(drm_sched_increase_karma);
366 * drm_sched_stop - stop the scheduler
368 * @sched: scheduler instance
369 * @bad: job which caused the time out
371 * Stop the scheduler and also removes and frees all completed jobs.
372 * Note: bad job will not be freed as it might be used later and so it's
373 * callers responsibility to release it manually if it's not part of the
374 * mirror list any more.
377 void drm_sched_stop(struct drm_gpu_scheduler *sched, struct drm_sched_job *bad)
379 struct drm_sched_job *s_job, *tmp;
381 kthread_park(sched->thread);
384 * Reinsert back the bad job here - now it's safe as
385 * drm_sched_get_cleanup_job cannot race against us and release the
386 * bad job at this point - we parked (waited for) any in progress
387 * (earlier) cleanups and drm_sched_get_cleanup_job will not be called
388 * now until the scheduler thread is unparked.
390 if (bad && bad->sched == sched)
392 * Add at the head of the queue to reflect it was the earliest
395 list_add(&bad->list, &sched->ring_mirror_list);
398 * Iterate the job list from later to earlier one and either deactive
399 * their HW callbacks or remove them from mirror list if they already
401 * This iteration is thread safe as sched thread is stopped.
403 list_for_each_entry_safe_reverse(s_job, tmp, &sched->ring_mirror_list,
405 if (s_job->s_fence->parent &&
406 dma_fence_remove_callback(s_job->s_fence->parent,
408 atomic_dec(&sched->hw_rq_count);
411 * remove job from ring_mirror_list.
412 * Locking here is for concurrent resume timeout
414 spin_lock(&sched->job_list_lock);
415 list_del_init(&s_job->list);
416 spin_unlock(&sched->job_list_lock);
419 * Wait for job's HW fence callback to finish using s_job
420 * before releasing it.
422 * Job is still alive so fence refcount at least 1
424 dma_fence_wait(&s_job->s_fence->finished, false);
427 * We must keep bad job alive for later use during
428 * recovery by some of the drivers but leave a hint
429 * that the guilty job must be released.
432 sched->ops->free_job(s_job);
434 sched->free_guilty = true;
439 * Stop pending timer in flight as we rearm it in drm_sched_start. This
440 * avoids the pending timeout work in progress to fire right away after
441 * this TDR finished and before the newly restarted jobs had a
442 * chance to complete.
444 cancel_delayed_work(&sched->work_tdr);
447 EXPORT_SYMBOL(drm_sched_stop);
450 * drm_sched_start - recover jobs after a reset
452 * @sched: scheduler instance
453 * @full_recovery: proceed with complete sched restart
456 void drm_sched_start(struct drm_gpu_scheduler *sched, bool full_recovery)
458 struct drm_sched_job *s_job, *tmp;
462 * Locking the list is not required here as the sched thread is parked
463 * so no new jobs are being inserted or removed. Also concurrent
464 * GPU recovers can't run in parallel.
466 list_for_each_entry_safe(s_job, tmp, &sched->ring_mirror_list, list) {
467 struct dma_fence *fence = s_job->s_fence->parent;
469 atomic_inc(&sched->hw_rq_count);
475 r = dma_fence_add_callback(fence, &s_job->cb,
476 drm_sched_process_job);
478 drm_sched_process_job(fence, &s_job->cb);
480 DRM_ERROR("fence add callback failed (%d)\n",
483 drm_sched_process_job(NULL, &s_job->cb);
487 spin_lock(&sched->job_list_lock);
488 drm_sched_start_timeout(sched);
489 spin_unlock(&sched->job_list_lock);
492 kthread_unpark(sched->thread);
494 EXPORT_SYMBOL(drm_sched_start);
497 * drm_sched_resubmit_jobs - helper to relunch job from mirror ring list
499 * @sched: scheduler instance
502 void drm_sched_resubmit_jobs(struct drm_gpu_scheduler *sched)
504 struct drm_sched_job *s_job, *tmp;
505 uint64_t guilty_context;
506 bool found_guilty = false;
507 struct dma_fence *fence;
509 list_for_each_entry_safe(s_job, tmp, &sched->ring_mirror_list, list) {
510 struct drm_sched_fence *s_fence = s_job->s_fence;
512 if (!found_guilty && atomic_read(&s_job->karma) > sched->hang_limit) {
514 guilty_context = s_job->s_fence->scheduled.context;
517 if (found_guilty && s_job->s_fence->scheduled.context == guilty_context)
518 dma_fence_set_error(&s_fence->finished, -ECANCELED);
520 dma_fence_put(s_job->s_fence->parent);
521 fence = sched->ops->run_job(s_job);
523 if (IS_ERR_OR_NULL(fence)) {
525 dma_fence_set_error(&s_fence->finished, PTR_ERR(fence));
527 s_job->s_fence->parent = NULL;
529 s_job->s_fence->parent = fence;
535 EXPORT_SYMBOL(drm_sched_resubmit_jobs);
538 * drm_sched_job_init - init a scheduler job
540 * @job: scheduler job to init
541 * @entity: scheduler entity to use
542 * @owner: job owner for debugging
544 * Refer to drm_sched_entity_push_job() documentation
545 * for locking considerations.
547 * Returns 0 for success, negative error code otherwise.
549 int drm_sched_job_init(struct drm_sched_job *job,
550 struct drm_sched_entity *entity,
553 struct drm_gpu_scheduler *sched;
555 drm_sched_entity_select_rq(entity);
559 sched = entity->rq->sched;
562 job->entity = entity;
563 job->s_priority = entity->rq - sched->sched_rq;
564 job->s_fence = drm_sched_fence_create(entity, owner);
567 job->id = atomic64_inc_return(&sched->job_id_count);
569 INIT_LIST_HEAD(&job->list);
573 EXPORT_SYMBOL(drm_sched_job_init);
576 * drm_sched_job_cleanup - clean up scheduler job resources
578 * @job: scheduler job to clean up
580 void drm_sched_job_cleanup(struct drm_sched_job *job)
582 dma_fence_put(&job->s_fence->finished);
585 EXPORT_SYMBOL(drm_sched_job_cleanup);
588 * drm_sched_ready - is the scheduler ready
590 * @sched: scheduler instance
592 * Return true if we can push more jobs to the hw, otherwise false.
594 static bool drm_sched_ready(struct drm_gpu_scheduler *sched)
596 return atomic_read(&sched->hw_rq_count) <
597 sched->hw_submission_limit;
601 * drm_sched_wakeup - Wake up the scheduler when it is ready
603 * @sched: scheduler instance
606 void drm_sched_wakeup(struct drm_gpu_scheduler *sched)
608 if (drm_sched_ready(sched))
609 wake_up_interruptible(&sched->wake_up_worker);
613 * drm_sched_select_entity - Select next entity to process
615 * @sched: scheduler instance
617 * Returns the entity to process or NULL if none are found.
619 static struct drm_sched_entity *
620 drm_sched_select_entity(struct drm_gpu_scheduler *sched)
622 struct drm_sched_entity *entity;
625 if (!drm_sched_ready(sched))
628 /* Kernel run queue has higher priority than normal run queue*/
629 for (i = DRM_SCHED_PRIORITY_COUNT - 1; i >= DRM_SCHED_PRIORITY_MIN; i--) {
630 entity = drm_sched_rq_select_entity(&sched->sched_rq[i]);
639 * drm_sched_process_job - process a job
642 * @cb: fence callbacks
644 * Called after job has finished execution.
646 static void drm_sched_process_job(struct dma_fence *f, struct dma_fence_cb *cb)
648 struct drm_sched_job *s_job = container_of(cb, struct drm_sched_job, cb);
649 struct drm_sched_fence *s_fence = s_job->s_fence;
650 struct drm_gpu_scheduler *sched = s_fence->sched;
652 atomic_dec(&sched->hw_rq_count);
653 atomic_dec(&sched->score);
655 trace_drm_sched_process_job(s_fence);
657 dma_fence_get(&s_fence->finished);
658 drm_sched_fence_finished(s_fence);
659 dma_fence_put(&s_fence->finished);
660 wake_up_interruptible(&sched->wake_up_worker);
664 * drm_sched_get_cleanup_job - fetch the next finished job to be destroyed
666 * @sched: scheduler instance
668 * Returns the next finished job from the mirror list (if there is one)
669 * ready for it to be destroyed.
671 static struct drm_sched_job *
672 drm_sched_get_cleanup_job(struct drm_gpu_scheduler *sched)
674 struct drm_sched_job *job;
677 * Don't destroy jobs while the timeout worker is running OR thread
678 * is being parked and hence assumed to not touch ring_mirror_list
680 if ((sched->timeout != MAX_SCHEDULE_TIMEOUT &&
681 !cancel_delayed_work(&sched->work_tdr)) ||
682 kthread_should_park())
685 spin_lock(&sched->job_list_lock);
687 job = list_first_entry_or_null(&sched->ring_mirror_list,
688 struct drm_sched_job, list);
690 if (job && dma_fence_is_signaled(&job->s_fence->finished)) {
691 /* remove job from ring_mirror_list */
692 list_del_init(&job->list);
695 /* queue timeout for next job */
696 drm_sched_start_timeout(sched);
699 spin_unlock(&sched->job_list_lock);
705 * drm_sched_pick_best - Get a drm sched from a sched_list with the least load
706 * @sched_list: list of drm_gpu_schedulers
707 * @num_sched_list: number of drm_gpu_schedulers in the sched_list
709 * Returns pointer of the sched with the least load or NULL if none of the
710 * drm_gpu_schedulers are ready
712 struct drm_gpu_scheduler *
713 drm_sched_pick_best(struct drm_gpu_scheduler **sched_list,
714 unsigned int num_sched_list)
716 struct drm_gpu_scheduler *sched, *picked_sched = NULL;
718 unsigned int min_score = UINT_MAX, num_score;
720 for (i = 0; i < num_sched_list; ++i) {
721 sched = sched_list[i];
724 DRM_WARN("scheduler %s is not ready, skipping",
729 num_score = atomic_read(&sched->score);
730 if (num_score < min_score) {
731 min_score = num_score;
732 picked_sched = sched;
738 EXPORT_SYMBOL(drm_sched_pick_best);
741 * drm_sched_blocked - check if the scheduler is blocked
743 * @sched: scheduler instance
745 * Returns true if blocked, otherwise false.
747 static bool drm_sched_blocked(struct drm_gpu_scheduler *sched)
749 if (kthread_should_park()) {
758 * drm_sched_main - main scheduler thread
760 * @param: scheduler instance
764 static int drm_sched_main(void *param)
766 struct drm_gpu_scheduler *sched = (struct drm_gpu_scheduler *)param;
769 sched_set_fifo_low(current);
771 while (!kthread_should_stop()) {
772 struct drm_sched_entity *entity = NULL;
773 struct drm_sched_fence *s_fence;
774 struct drm_sched_job *sched_job;
775 struct dma_fence *fence;
776 struct drm_sched_job *cleanup_job = NULL;
778 wait_event_interruptible(sched->wake_up_worker,
779 (cleanup_job = drm_sched_get_cleanup_job(sched)) ||
780 (!drm_sched_blocked(sched) &&
781 (entity = drm_sched_select_entity(sched))) ||
782 kthread_should_stop());
785 sched->ops->free_job(cleanup_job);
786 /* queue timeout for next job */
787 drm_sched_start_timeout(sched);
793 sched_job = drm_sched_entity_pop_job(entity);
795 complete(&entity->entity_idle);
800 s_fence = sched_job->s_fence;
802 atomic_inc(&sched->hw_rq_count);
803 drm_sched_job_begin(sched_job);
805 trace_drm_run_job(sched_job, entity);
806 fence = sched->ops->run_job(sched_job);
807 drm_sched_fence_scheduled(s_fence);
809 if (!IS_ERR_OR_NULL(fence)) {
810 s_fence->parent = dma_fence_get(fence);
811 r = dma_fence_add_callback(fence, &sched_job->cb,
812 drm_sched_process_job);
814 drm_sched_process_job(fence, &sched_job->cb);
816 DRM_ERROR("fence add callback failed (%d)\n",
818 dma_fence_put(fence);
821 dma_fence_set_error(&s_fence->finished, PTR_ERR(fence));
823 drm_sched_process_job(NULL, &sched_job->cb);
826 wake_up(&sched->job_scheduled);
832 * drm_sched_init - Init a gpu scheduler instance
834 * @sched: scheduler instance
835 * @ops: backend operations for this scheduler
836 * @hw_submission: number of hw submissions that can be in flight
837 * @hang_limit: number of times to allow a job to hang before dropping it
838 * @timeout: timeout value in jiffies for the scheduler
839 * @name: name used for debugging
841 * Return 0 on success, otherwise error code.
843 int drm_sched_init(struct drm_gpu_scheduler *sched,
844 const struct drm_sched_backend_ops *ops,
845 unsigned hw_submission,
852 sched->hw_submission_limit = hw_submission;
854 sched->timeout = timeout;
855 sched->hang_limit = hang_limit;
856 for (i = DRM_SCHED_PRIORITY_MIN; i < DRM_SCHED_PRIORITY_COUNT; i++)
857 drm_sched_rq_init(sched, &sched->sched_rq[i]);
859 init_waitqueue_head(&sched->wake_up_worker);
860 init_waitqueue_head(&sched->job_scheduled);
861 INIT_LIST_HEAD(&sched->ring_mirror_list);
862 spin_lock_init(&sched->job_list_lock);
863 atomic_set(&sched->hw_rq_count, 0);
864 INIT_DELAYED_WORK(&sched->work_tdr, drm_sched_job_timedout);
865 atomic_set(&sched->score, 0);
866 atomic64_set(&sched->job_id_count, 0);
868 /* Each scheduler will run on a seperate kernel thread */
869 sched->thread = kthread_run(drm_sched_main, sched, sched->name);
870 if (IS_ERR(sched->thread)) {
871 ret = PTR_ERR(sched->thread);
872 sched->thread = NULL;
873 DRM_ERROR("Failed to create scheduler for %s.\n", name);
880 EXPORT_SYMBOL(drm_sched_init);
883 * drm_sched_fini - Destroy a gpu scheduler
885 * @sched: scheduler instance
887 * Tears down and cleans up the scheduler.
889 void drm_sched_fini(struct drm_gpu_scheduler *sched)
892 kthread_stop(sched->thread);
894 sched->ready = false;
896 EXPORT_SYMBOL(drm_sched_fini);