summaryrefslogtreecommitdiff
path: root/drivers/gpu/drm/scheduler/gpu_scheduler.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/gpu/drm/scheduler/gpu_scheduler.c')
-rw-r--r--drivers/gpu/drm/scheduler/gpu_scheduler.c386
1 files changed, 272 insertions, 114 deletions
diff --git a/drivers/gpu/drm/scheduler/gpu_scheduler.c b/drivers/gpu/drm/scheduler/gpu_scheduler.c
index 44d480768dfe..4fc211e19d6e 100644
--- a/drivers/gpu/drm/scheduler/gpu_scheduler.c
+++ b/drivers/gpu/drm/scheduler/gpu_scheduler.c
@@ -21,6 +21,29 @@
*
*/
+/**
+ * DOC: Overview
+ *
+ * The GPU scheduler provides entities which allow userspace to push jobs
+ * into software queues which are then scheduled on a hardware run queue.
+ * The software queues have a priority among them. The scheduler selects the entities
+ * from the run queue using a FIFO. The scheduler provides dependency handling
+ * features among jobs. The driver is supposed to provide callback functions for
+ * backend operations to the scheduler like submitting a job to hardware run queue,
+ * returning the dependencies of a job etc.
+ *
+ * The organisation of the scheduler is the following:
+ *
+ * 1. Each hw run queue has one scheduler
+ * 2. Each scheduler has multiple run queues with different priorities
+ * (e.g., HIGH_HW,HIGH_SW, KERNEL, NORMAL)
+ * 3. Each scheduler run queue has a queue of entities to schedule
+ * 4. Entities themselves maintain a queue of jobs that will be scheduled on
+ * the hardware.
+ *
+ * The jobs in a entity are always scheduled in the order that they were pushed.
+ */
+
#include <linux/kthread.h>
#include <linux/wait.h>
#include <linux/sched.h>
@@ -39,14 +62,30 @@ static bool drm_sched_entity_is_ready(struct drm_sched_entity *entity);
static void drm_sched_wakeup(struct drm_gpu_scheduler *sched);
static void drm_sched_process_job(struct dma_fence *f, struct dma_fence_cb *cb);
-/* Initialize a given run queue struct */
-static void drm_sched_rq_init(struct drm_sched_rq *rq)
+/**
+ * drm_sched_rq_init - initialize a given run queue struct
+ *
+ * @rq: scheduler run queue
+ *
+ * Initializes a scheduler runqueue.
+ */
+static void drm_sched_rq_init(struct drm_gpu_scheduler *sched,
+ struct drm_sched_rq *rq)
{
spin_lock_init(&rq->lock);
INIT_LIST_HEAD(&rq->entities);
rq->current_entity = NULL;
+ rq->sched = sched;
}
+/**
+ * drm_sched_rq_add_entity - add an entity
+ *
+ * @rq: scheduler run queue
+ * @entity: scheduler entity
+ *
+ * Adds a scheduler entity to the run queue.
+ */
static void drm_sched_rq_add_entity(struct drm_sched_rq *rq,
struct drm_sched_entity *entity)
{
@@ -57,6 +96,14 @@ static void drm_sched_rq_add_entity(struct drm_sched_rq *rq,
spin_unlock(&rq->lock);
}
+/**
+ * drm_sched_rq_remove_entity - remove an entity
+ *
+ * @rq: scheduler run queue
+ * @entity: scheduler entity
+ *
+ * Removes a scheduler entity from the run queue.
+ */
static void drm_sched_rq_remove_entity(struct drm_sched_rq *rq,
struct drm_sched_entity *entity)
{
@@ -70,9 +117,9 @@ static void drm_sched_rq_remove_entity(struct drm_sched_rq *rq,
}
/**
- * Select an entity which could provide a job to run
+ * drm_sched_rq_select_entity - Select an entity which could provide a job to run
*
- * @rq The run queue to check.
+ * @rq: scheduler run queue to check.
*
* Try to find a ready entity, returns NULL if none found.
*/
@@ -112,30 +159,33 @@ drm_sched_rq_select_entity(struct drm_sched_rq *rq)
}
/**
- * Init a context entity used by scheduler when submit to HW ring.
+ * drm_sched_entity_init - Init a context entity used by scheduler when
+ * submit to HW ring.
+ *
+ * @entity: scheduler entity to init
+ * @rq_list: the list of run queue on which jobs from this
+ * entity can be submitted
+ * @num_rq_list: number of run queue in rq_list
+ * @guilty: atomic_t set to 1 when a job on this queue
+ * is found to be guilty causing a timeout
*
- * @sched The pointer to the scheduler
- * @entity The pointer to a valid drm_sched_entity
- * @rq The run queue this entity belongs
- * @guilty atomic_t set to 1 when a job on this queue
- * is found to be guilty causing a timeout
+ * Note: the rq_list should have atleast one element to schedule
+ * the entity
*
- * return 0 if succeed. negative error code on failure
+ * Returns 0 on success or a negative error code on failure.
*/
-int drm_sched_entity_init(struct drm_gpu_scheduler *sched,
- struct drm_sched_entity *entity,
- struct drm_sched_rq *rq,
+int drm_sched_entity_init(struct drm_sched_entity *entity,
+ struct drm_sched_rq **rq_list,
+ unsigned int num_rq_list,
atomic_t *guilty)
{
- if (!(sched && entity && rq))
+ if (!(entity && rq_list && num_rq_list > 0 && rq_list[0]))
return -EINVAL;
memset(entity, 0, sizeof(struct drm_sched_entity));
INIT_LIST_HEAD(&entity->list);
- entity->rq = rq;
- entity->sched = sched;
+ entity->rq = rq_list[0];
entity->guilty = guilty;
- entity->fini_status = 0;
entity->last_scheduled = NULL;
spin_lock_init(&entity->rq_lock);
@@ -149,40 +199,27 @@ int drm_sched_entity_init(struct drm_gpu_scheduler *sched,
EXPORT_SYMBOL(drm_sched_entity_init);
/**
- * Query if entity is initialized
+ * drm_sched_entity_is_idle - Check if entity is idle
*
- * @sched Pointer to scheduler instance
- * @entity The pointer to a valid scheduler entity
- *
- * return true if entity is initialized, false otherwise
-*/
-static bool drm_sched_entity_is_initialized(struct drm_gpu_scheduler *sched,
- struct drm_sched_entity *entity)
-{
- return entity->sched == sched &&
- entity->rq != NULL;
-}
-
-/**
- * Check if entity is idle
+ * @entity: scheduler entity
*
- * @entity The pointer to a valid scheduler entity
- *
- * Return true if entity don't has any unscheduled jobs.
+ * Returns true if the entity does not have any unscheduled jobs.
*/
static bool drm_sched_entity_is_idle(struct drm_sched_entity *entity)
{
rmb();
- if (spsc_queue_peek(&entity->job_queue) == NULL)
+
+ if (list_empty(&entity->list) ||
+ spsc_queue_peek(&entity->job_queue) == NULL)
return true;
return false;
}
/**
- * Check if entity is ready
+ * drm_sched_entity_is_ready - Check if entity is ready
*
- * @entity The pointer to a valid scheduler entity
+ * @entity: scheduler entity
*
* Return true if entity could provide a job.
*/
@@ -210,44 +247,67 @@ static void drm_sched_entity_kill_jobs_cb(struct dma_fence *f,
/**
- * Destroy a context entity
+ * drm_sched_entity_flush - Flush a context entity
*
- * @sched Pointer to scheduler instance
- * @entity The pointer to a valid scheduler entity
+ * @entity: scheduler entity
+ * @timeout: time to wait in for Q to become empty in jiffies.
*
- * Splitting drm_sched_entity_fini() into two functions, The first one is does the waiting,
+ * Splitting drm_sched_entity_fini() into two functions, The first one does the waiting,
* removes the entity from the runqueue and returns an error when the process was killed.
+ *
+ * Returns the remaining time in jiffies left from the input timeout
*/
-void drm_sched_entity_do_release(struct drm_gpu_scheduler *sched,
- struct drm_sched_entity *entity)
+long drm_sched_entity_flush(struct drm_sched_entity *entity, long timeout)
{
- if (!drm_sched_entity_is_initialized(sched, entity))
- return;
+ struct drm_gpu_scheduler *sched;
+ struct task_struct *last_user;
+ long ret = timeout;
+
+ sched = entity->rq->sched;
/**
* The client will not queue more IBs during this fini, consume existing
* queued IBs or discard them on SIGKILL
*/
- if ((current->flags & PF_SIGNALED) && current->exit_code == SIGKILL)
- entity->fini_status = -ERESTARTSYS;
- else
- entity->fini_status = wait_event_killable(sched->job_scheduled,
- drm_sched_entity_is_idle(entity));
- drm_sched_entity_set_rq(entity, NULL);
+ if (current->flags & PF_EXITING) {
+ if (timeout)
+ ret = wait_event_timeout(
+ sched->job_scheduled,
+ drm_sched_entity_is_idle(entity),
+ timeout);
+ } else
+ wait_event_killable(sched->job_scheduled, drm_sched_entity_is_idle(entity));
+
+
+ /* For killed process disable any more IBs enqueue right now */
+ last_user = cmpxchg(&entity->last_user, current->group_leader, NULL);
+ if ((!last_user || last_user == current->group_leader) &&
+ (current->flags & PF_EXITING) && (current->exit_code == SIGKILL))
+ drm_sched_rq_remove_entity(entity->rq, entity);
+
+ return ret;
}
-EXPORT_SYMBOL(drm_sched_entity_do_release);
+EXPORT_SYMBOL(drm_sched_entity_flush);
/**
- * Destroy a context entity
+ * drm_sched_entity_cleanup - Destroy a context entity
+ *
+ * @entity: scheduler entity
*
- * @sched Pointer to scheduler instance
- * @entity The pointer to a valid scheduler entity
+ * This should be called after @drm_sched_entity_do_release. It goes over the
+ * entity and signals all jobs with an error code if the process was killed.
*
- * The second one then goes over the entity and signals all jobs with an error code.
*/
-void drm_sched_entity_cleanup(struct drm_gpu_scheduler *sched,
- struct drm_sched_entity *entity)
+void drm_sched_entity_fini(struct drm_sched_entity *entity)
{
- if (entity->fini_status) {
+ struct drm_gpu_scheduler *sched;
+
+ sched = entity->rq->sched;
+ drm_sched_rq_remove_entity(entity->rq, entity);
+
+ /* Consumption of existing IBs wasn't completed. Forcefully
+ * remove them here.
+ */
+ if (spsc_queue_peek(&entity->job_queue)) {
struct drm_sched_job *job;
int r;
@@ -267,27 +327,43 @@ void drm_sched_entity_cleanup(struct drm_gpu_scheduler *sched,
struct drm_sched_fence *s_fence = job->s_fence;
drm_sched_fence_scheduled(s_fence);
dma_fence_set_error(&s_fence->finished, -ESRCH);
- r = dma_fence_add_callback(entity->last_scheduled, &job->finish_cb,
- drm_sched_entity_kill_jobs_cb);
- if (r == -ENOENT)
+
+ /*
+ * When pipe is hanged by older entity, new entity might
+ * not even have chance to submit it's first job to HW
+ * and so entity->last_scheduled will remain NULL
+ */
+ if (!entity->last_scheduled) {
drm_sched_entity_kill_jobs_cb(NULL, &job->finish_cb);
- else if (r)
- DRM_ERROR("fence add callback failed (%d)\n", r);
+ } else {
+ r = dma_fence_add_callback(entity->last_scheduled, &job->finish_cb,
+ drm_sched_entity_kill_jobs_cb);
+ if (r == -ENOENT)
+ drm_sched_entity_kill_jobs_cb(NULL, &job->finish_cb);
+ else if (r)
+ DRM_ERROR("fence add callback failed (%d)\n", r);
+ }
}
}
dma_fence_put(entity->last_scheduled);
entity->last_scheduled = NULL;
}
-EXPORT_SYMBOL(drm_sched_entity_cleanup);
+EXPORT_SYMBOL(drm_sched_entity_fini);
-void drm_sched_entity_fini(struct drm_gpu_scheduler *sched,
- struct drm_sched_entity *entity)
+/**
+ * drm_sched_entity_fini - Destroy a context entity
+ *
+ * @entity: scheduler entity
+ *
+ * Calls drm_sched_entity_do_release() and drm_sched_entity_cleanup()
+ */
+void drm_sched_entity_destroy(struct drm_sched_entity *entity)
{
- drm_sched_entity_do_release(sched, entity);
- drm_sched_entity_cleanup(sched, entity);
+ drm_sched_entity_flush(entity, MAX_WAIT_SCHED_ENTITY_Q_EMPTY);
+ drm_sched_entity_fini(entity);
}
-EXPORT_SYMBOL(drm_sched_entity_fini);
+EXPORT_SYMBOL(drm_sched_entity_destroy);
static void drm_sched_entity_wakeup(struct dma_fence *f, struct dma_fence_cb *cb)
{
@@ -295,7 +371,7 @@ static void drm_sched_entity_wakeup(struct dma_fence *f, struct dma_fence_cb *cb
container_of(cb, struct drm_sched_entity, cb);
entity->dependency = NULL;
dma_fence_put(f);
- drm_sched_wakeup(entity->sched);
+ drm_sched_wakeup(entity->rq->sched);
}
static void drm_sched_entity_clear_dep(struct dma_fence *f, struct dma_fence_cb *cb)
@@ -306,29 +382,43 @@ static void drm_sched_entity_clear_dep(struct dma_fence *f, struct dma_fence_cb
dma_fence_put(f);
}
+/**
+ * drm_sched_entity_set_rq - Sets the run queue for an entity
+ *
+ * @entity: scheduler entity
+ * @rq: scheduler run queue
+ *
+ * Sets the run queue for an entity and removes the entity from the previous
+ * run queue in which was present.
+ */
void drm_sched_entity_set_rq(struct drm_sched_entity *entity,
struct drm_sched_rq *rq)
{
if (entity->rq == rq)
return;
- spin_lock(&entity->rq_lock);
-
- if (entity->rq)
- drm_sched_rq_remove_entity(entity->rq, entity);
+ BUG_ON(!rq);
+ spin_lock(&entity->rq_lock);
+ drm_sched_rq_remove_entity(entity->rq, entity);
entity->rq = rq;
- if (rq)
- drm_sched_rq_add_entity(rq, entity);
-
+ drm_sched_rq_add_entity(rq, entity);
spin_unlock(&entity->rq_lock);
}
EXPORT_SYMBOL(drm_sched_entity_set_rq);
+/**
+ * drm_sched_dependency_optimized
+ *
+ * @fence: the dependency fence
+ * @entity: the entity which depends on the above fence
+ *
+ * Returns true if the dependency can be optimized and false otherwise
+ */
bool drm_sched_dependency_optimized(struct dma_fence* fence,
struct drm_sched_entity *entity)
{
- struct drm_gpu_scheduler *sched = entity->sched;
+ struct drm_gpu_scheduler *sched = entity->rq->sched;
struct drm_sched_fence *s_fence;
if (!fence || dma_fence_is_signaled(fence))
@@ -345,7 +435,7 @@ EXPORT_SYMBOL(drm_sched_dependency_optimized);
static bool drm_sched_entity_add_dependency_cb(struct drm_sched_entity *entity)
{
- struct drm_gpu_scheduler *sched = entity->sched;
+ struct drm_gpu_scheduler *sched = entity->rq->sched;
struct dma_fence * fence = entity->dependency;
struct drm_sched_fence *s_fence;
@@ -390,7 +480,7 @@ static bool drm_sched_entity_add_dependency_cb(struct drm_sched_entity *entity)
static struct drm_sched_job *
drm_sched_entity_pop_job(struct drm_sched_entity *entity)
{
- struct drm_gpu_scheduler *sched = entity->sched;
+ struct drm_gpu_scheduler *sched = entity->rq->sched;
struct drm_sched_job *sched_job = to_drm_sched_job(
spsc_queue_peek(&entity->job_queue));
@@ -413,9 +503,10 @@ drm_sched_entity_pop_job(struct drm_sched_entity *entity)
}
/**
- * Submit a job to the job queue
+ * drm_sched_entity_push_job - Submit a job to the entity's job queue
*
- * @sched_job The pointer to job required to submit
+ * @sched_job: job to submit
+ * @entity: scheduler entity
*
* Note: To guarantee that the order of insertion to queue matches
* the job's fence sequence number this function should be
@@ -431,12 +522,18 @@ void drm_sched_entity_push_job(struct drm_sched_job *sched_job,
trace_drm_sched_job(sched_job, entity);
+ WRITE_ONCE(entity->last_user, current->group_leader);
first = spsc_queue_push(&entity->job_queue, &sched_job->queue_node);
/* first job wakes up scheduler */
if (first) {
/* Add the entity to the run queue */
spin_lock(&entity->rq_lock);
+ if (!entity->rq) {
+ DRM_ERROR("Trying to push to a killed entity\n");
+ spin_unlock(&entity->rq_lock);
+ return;
+ }
drm_sched_rq_add_entity(entity->rq, entity);
spin_unlock(&entity->rq_lock);
drm_sched_wakeup(sched);
@@ -452,24 +549,28 @@ static void drm_sched_job_finish(struct work_struct *work)
finish_work);
struct drm_gpu_scheduler *sched = s_job->sched;
- /* remove job from ring_mirror_list */
- spin_lock(&sched->job_list_lock);
- list_del_init(&s_job->node);
- if (sched->timeout != MAX_SCHEDULE_TIMEOUT) {
- struct drm_sched_job *next;
-
- spin_unlock(&sched->job_list_lock);
- cancel_delayed_work_sync(&s_job->work_tdr);
- spin_lock(&sched->job_list_lock);
+ /*
+ * Canceling the timeout without removing our job from the ring mirror
+ * list is safe, as we will only end up in this worker if our jobs
+ * finished fence has been signaled. So even if some another worker
+ * manages to find this job as the next job in the list, the fence
+ * signaled check below will prevent the timeout to be restarted.
+ */
+ cancel_delayed_work_sync(&s_job->work_tdr);
- /* queue TDR for next job */
- next = list_first_entry_or_null(&sched->ring_mirror_list,
- struct drm_sched_job, node);
+ spin_lock(&sched->job_list_lock);
+ /* queue TDR for next job */
+ if (sched->timeout != MAX_SCHEDULE_TIMEOUT &&
+ !list_is_last(&s_job->node, &sched->ring_mirror_list)) {
+ struct drm_sched_job *next = list_next_entry(s_job, node);
- if (next)
+ if (!dma_fence_is_signaled(&next->s_fence->finished))
schedule_delayed_work(&next->work_tdr, sched->timeout);
}
+ /* remove job from ring_mirror_list */
+ list_del(&s_job->node);
spin_unlock(&sched->job_list_lock);
+
dma_fence_put(&s_job->s_fence->finished);
sched->ops->free_job(s_job);
}
@@ -506,6 +607,13 @@ static void drm_sched_job_timedout(struct work_struct *work)
job->sched->ops->timedout_job(job);
}
+/**
+ * drm_sched_hw_job_reset - stop the scheduler if it contains the bad job
+ *
+ * @sched: scheduler instance
+ * @bad: bad scheduler job
+ *
+ */
void drm_sched_hw_job_reset(struct drm_gpu_scheduler *sched, struct drm_sched_job *bad)
{
struct drm_sched_job *s_job;
@@ -550,6 +658,12 @@ void drm_sched_hw_job_reset(struct drm_gpu_scheduler *sched, struct drm_sched_jo
}
EXPORT_SYMBOL(drm_sched_hw_job_reset);
+/**
+ * drm_sched_job_recovery - recover jobs after a reset
+ *
+ * @sched: scheduler instance
+ *
+ */
void drm_sched_job_recovery(struct drm_gpu_scheduler *sched)
{
struct drm_sched_job *s_job, *tmp;
@@ -599,16 +713,23 @@ void drm_sched_job_recovery(struct drm_gpu_scheduler *sched)
EXPORT_SYMBOL(drm_sched_job_recovery);
/**
- * Init a sched_job with basic field
+ * drm_sched_job_init - init a scheduler job
+ *
+ * @job: scheduler job to init
+ * @entity: scheduler entity to use
+ * @owner: job owner for debugging
*
- * Note: Refer to drm_sched_entity_push_job documentation
+ * Refer to drm_sched_entity_push_job() documentation
* for locking considerations.
+ *
+ * Returns 0 for success, negative error code otherwise.
*/
int drm_sched_job_init(struct drm_sched_job *job,
- struct drm_gpu_scheduler *sched,
struct drm_sched_entity *entity,
void *owner)
{
+ struct drm_gpu_scheduler *sched = entity->rq->sched;
+
job->sched = sched;
job->entity = entity;
job->s_priority = entity->rq - sched->sched_rq;
@@ -626,7 +747,11 @@ int drm_sched_job_init(struct drm_sched_job *job,
EXPORT_SYMBOL(drm_sched_job_init);
/**
- * Return ture if we can push more jobs to the hw.
+ * drm_sched_ready - is the scheduler ready
+ *
+ * @sched: scheduler instance
+ *
+ * Return true if we can push more jobs to the hw, otherwise false.
*/
static bool drm_sched_ready(struct drm_gpu_scheduler *sched)
{
@@ -635,7 +760,10 @@ static bool drm_sched_ready(struct drm_gpu_scheduler *sched)
}
/**
- * Wake up the scheduler when it is ready
+ * drm_sched_wakeup - Wake up the scheduler when it is ready
+ *
+ * @sched: scheduler instance
+ *
*/
static void drm_sched_wakeup(struct drm_gpu_scheduler *sched)
{
@@ -644,8 +772,12 @@ static void drm_sched_wakeup(struct drm_gpu_scheduler *sched)
}
/**
- * Select next entity to process
-*/
+ * drm_sched_select_entity - Select next entity to process
+ *
+ * @sched: scheduler instance
+ *
+ * Returns the entity to process or NULL if none are found.
+ */
static struct drm_sched_entity *
drm_sched_select_entity(struct drm_gpu_scheduler *sched)
{
@@ -665,6 +797,14 @@ drm_sched_select_entity(struct drm_gpu_scheduler *sched)
return entity;
}
+/**
+ * drm_sched_process_job - process a job
+ *
+ * @f: fence
+ * @cb: fence callbacks
+ *
+ * Called after job has finished execution.
+ */
static void drm_sched_process_job(struct dma_fence *f, struct dma_fence_cb *cb)
{
struct drm_sched_fence *s_fence =
@@ -680,6 +820,13 @@ static void drm_sched_process_job(struct dma_fence *f, struct dma_fence_cb *cb)
wake_up_interruptible(&sched->wake_up_worker);
}
+/**
+ * drm_sched_blocked - check if the scheduler is blocked
+ *
+ * @sched: scheduler instance
+ *
+ * Returns true if blocked, otherwise false.
+ */
static bool drm_sched_blocked(struct drm_gpu_scheduler *sched)
{
if (kthread_should_park()) {
@@ -690,6 +837,13 @@ static bool drm_sched_blocked(struct drm_gpu_scheduler *sched)
return false;
}
+/**
+ * drm_sched_main - main scheduler thread
+ *
+ * @param: scheduler instance
+ *
+ * Returns 0.
+ */
static int drm_sched_main(void *param)
{
struct sched_param sparam = {.sched_priority = 1};
@@ -744,15 +898,17 @@ static int drm_sched_main(void *param)
}
/**
- * Init a gpu scheduler instance
+ * drm_sched_init - Init a gpu scheduler instance
*
- * @sched The pointer to the scheduler
- * @ops The backend operations for this scheduler.
- * @hw_submissions Number of hw submissions to do.
- * @name Name used for debugging
+ * @sched: scheduler instance
+ * @ops: backend operations for this scheduler
+ * @hw_submission: number of hw submissions that can be in flight
+ * @hang_limit: number of times to allow a job to hang before dropping it
+ * @timeout: timeout value in jiffies for the scheduler
+ * @name: name used for debugging
*
* Return 0 on success, otherwise error code.
-*/
+ */
int drm_sched_init(struct drm_gpu_scheduler *sched,
const struct drm_sched_backend_ops *ops,
unsigned hw_submission,
@@ -767,7 +923,7 @@ int drm_sched_init(struct drm_gpu_scheduler *sched,
sched->timeout = timeout;
sched->hang_limit = hang_limit;
for (i = DRM_SCHED_PRIORITY_MIN; i < DRM_SCHED_PRIORITY_MAX; i++)
- drm_sched_rq_init(&sched->sched_rq[i]);
+ drm_sched_rq_init(sched, &sched->sched_rq[i]);
init_waitqueue_head(&sched->wake_up_worker);
init_waitqueue_head(&sched->job_scheduled);
@@ -788,9 +944,11 @@ int drm_sched_init(struct drm_gpu_scheduler *sched,
EXPORT_SYMBOL(drm_sched_init);
/**
- * Destroy a gpu scheduler
+ * drm_sched_fini - Destroy a gpu scheduler
+ *
+ * @sched: scheduler instance
*
- * @sched The pointer to the scheduler
+ * Tears down and cleans up the scheduler.
*/
void drm_sched_fini(struct drm_gpu_scheduler *sched)
{