drm/scheduler: move entity handling into separate file

This is complex enough on it's own. Move it into a separate C file.

Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Huang Rui <ray.huang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

3 files changed, 465 insertions, 437 deletions

diff --git a/drivers/gpu/drm/scheduler/Makefile b/drivers/gpu/drm/scheduler/Makefile
index 7665883f81d4..f23785d4b3c8 100644
--- a/drivers/gpu/drm/scheduler/Makefile
+++ b/drivers/gpu/drm/scheduler/Makefile
@@ -20,6 +20,6 @@
 # OTHER DEALINGS IN THE SOFTWARE.
 #
 #
-gpu-sched-y := gpu_scheduler.o sched_fence.o
+gpu-sched-y := gpu_scheduler.o sched_fence.o sched_entity.o
 
 obj-$(CONFIG_DRM_SCHED) += gpu-sched.o
diff --git a/drivers/gpu/drm/scheduler/gpu_scheduler.c b/drivers/gpu/drm/scheduler/gpu_scheduler.c
index 85c1f95752cc..9ca741f3a0bc 100644
--- a/drivers/gpu/drm/scheduler/gpu_scheduler.c
+++ b/drivers/gpu/drm/scheduler/gpu_scheduler.c
@@ -58,8 +58,6 @@
 #define to_drm_sched_job(sched_job)		\
 		container_of((sched_job), struct drm_sched_job, queue_node)
 
-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);
 
 /**
@@ -86,8 +84,8 @@ static void drm_sched_rq_init(struct drm_gpu_scheduler *sched,
  *
  * 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)
+void drm_sched_rq_add_entity(struct drm_sched_rq *rq,
+			     struct drm_sched_entity *entity)
 {
 	if (!list_empty(&entity->list))
 		return;
@@ -104,8 +102,8 @@ static void drm_sched_rq_add_entity(struct drm_sched_rq *rq,
  *
  * 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)
+void drm_sched_rq_remove_entity(struct drm_sched_rq *rq,
+				struct drm_sched_entity *entity)
 {
 	if (list_empty(&entity->list))
 		return;
@@ -159,301 +157,6 @@ drm_sched_rq_select_entity(struct drm_sched_rq *rq)
 }
 
 /**
- * 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
- *
- * Note: the rq_list should have atleast one element to schedule
- *       the entity
- *
- * Returns 0 on success or a negative error code on failure.
-*/
-int drm_sched_entity_init(struct drm_sched_entity *entity,
-			  struct drm_sched_rq **rq_list,
-			  unsigned int num_rq_list,
-			  atomic_t *guilty)
-{
-	int i;
-
-	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_list[0];
-	entity->guilty = guilty;
-	entity->num_rq_list = num_rq_list;
-	entity->rq_list = kcalloc(num_rq_list, sizeof(struct drm_sched_rq *),
-				GFP_KERNEL);
-	if (!entity->rq_list)
-		return -ENOMEM;
-
-	for (i = 0; i < num_rq_list; ++i)
-		entity->rq_list[i] = rq_list[i];
-	entity->last_scheduled = NULL;
-
-	spin_lock_init(&entity->rq_lock);
-	spsc_queue_init(&entity->job_queue);
-
-	atomic_set(&entity->fence_seq, 0);
-	entity->fence_context = dma_fence_context_alloc(2);
-
-	return 0;
-}
-EXPORT_SYMBOL(drm_sched_entity_init);
-
-/**
- * drm_sched_entity_is_idle - Check if entity is idle
- *
- * @entity: scheduler entity
- *
- * 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 (list_empty(&entity->list) ||
-	    spsc_queue_peek(&entity->job_queue) == NULL)
-		return true;
-
-	return false;
-}
-
-/**
- * drm_sched_entity_is_ready - Check if entity is ready
- *
- * @entity: scheduler entity
- *
- * Return true if entity could provide a job.
- */
-static bool drm_sched_entity_is_ready(struct drm_sched_entity *entity)
-{
-	if (spsc_queue_peek(&entity->job_queue) == NULL)
-		return false;
-
-	if (READ_ONCE(entity->dependency))
-		return false;
-
-	return true;
-}
-
-/**
- * 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_rq_list; ++i) {
-		num_jobs = atomic_read(&entity->rq_list[i]->sched->num_jobs);
-		if (num_jobs < min_jobs) {
-			min_jobs = num_jobs;
-			rq = entity->rq_list[i];
-		}
-	}
-
-	return rq;
-}
-
-static void drm_sched_entity_kill_jobs_cb(struct dma_fence *f,
-				    struct dma_fence_cb *cb)
-{
-	struct drm_sched_job *job = container_of(cb, struct drm_sched_job,
-						 finish_cb);
-	drm_sched_fence_finished(job->s_fence);
-	WARN_ON(job->s_fence->parent);
-	dma_fence_put(&job->s_fence->finished);
-	job->sched->ops->free_job(job);
-}
-
-
-/**
- * drm_sched_entity_flush - Flush a context 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 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
- */
-long drm_sched_entity_flush(struct drm_sched_entity *entity, long timeout)
-{
-	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_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_flush);
-
-/**
- * drm_sched_entity_cleanup - Destroy a context entity
- *
- * @entity: 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.
- *
- */
-void drm_sched_entity_fini(struct drm_sched_entity *entity)
-{
-	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;
-
-		/* Park the kernel for a moment to make sure it isn't processing
-		 * our enity.
-		 */
-		kthread_park(sched->thread);
-		kthread_unpark(sched->thread);
-		if (entity->dependency) {
-			dma_fence_remove_callback(entity->dependency,
-						  &entity->cb);
-			dma_fence_put(entity->dependency);
-			entity->dependency = NULL;
-		}
-
-		while ((job = to_drm_sched_job(spsc_queue_pop(&entity->job_queue)))) {
-			struct drm_sched_fence *s_fence = job->s_fence;
-			drm_sched_fence_scheduled(s_fence);
-			dma_fence_set_error(&s_fence->finished, -ESRCH);
-
-			/*
-			 * 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 {
-				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;
-	kfree(entity->rq_list);
-}
-EXPORT_SYMBOL(drm_sched_entity_fini);
-
-/**
- * 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_flush(entity, MAX_WAIT_SCHED_ENTITY_Q_EMPTY);
-	drm_sched_entity_fini(entity);
-}
-EXPORT_SYMBOL(drm_sched_entity_destroy);
-
-static void drm_sched_entity_wakeup(struct dma_fence *f, struct dma_fence_cb *cb)
-{
-	struct drm_sched_entity *entity =
-		container_of(cb, struct drm_sched_entity, cb);
-	entity->dependency = NULL;
-	dma_fence_put(f);
-	drm_sched_wakeup(entity->rq->sched);
-}
-
-static void drm_sched_entity_clear_dep(struct dma_fence *f, struct dma_fence_cb *cb)
-{
-	struct drm_sched_entity *entity =
-		container_of(cb, struct drm_sched_entity, cb);
-	entity->dependency = NULL;
-	dma_fence_put(f);
-}
-
-/**
- * drm_sched_entity_set_rq_priority - helper for drm_sched_entity_set_priority
- */
-static void drm_sched_entity_set_rq_priority(struct drm_sched_rq **rq,
-					     enum drm_sched_priority priority)
-{
-	*rq = &(*rq)->sched->sched_rq[priority];
-}
-
-/**
- * drm_sched_entity_set_priority - Sets priority of the entity
- *
- * @entity: scheduler entity
- * @priority: scheduler priority
- *
- * Update the priority of runqueus used for the entity.
- */
-void drm_sched_entity_set_priority(struct drm_sched_entity *entity,
-				   enum drm_sched_priority priority)
-{
-	unsigned int i;
-
-	spin_lock(&entity->rq_lock);
-
-	for (i = 0; i < entity->num_rq_list; ++i)
-		drm_sched_entity_set_rq_priority(&entity->rq_list[i], priority);
-
-	drm_sched_rq_remove_entity(entity->rq, entity);
-	drm_sched_entity_set_rq_priority(&entity->rq, priority);
-	drm_sched_rq_add_entity(entity->rq, entity);
-
-	spin_unlock(&entity->rq_lock);
-}
-EXPORT_SYMBOL(drm_sched_entity_set_priority);
-
-/**
  * drm_sched_dependency_optimized
  *
  * @fence: the dependency fence
@@ -479,140 +182,6 @@ bool drm_sched_dependency_optimized(struct dma_fence* fence,
 }
 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->rq->sched;
-	struct dma_fence * fence = entity->dependency;
-	struct drm_sched_fence *s_fence;
-
-	if (fence->context == entity->fence_context ||
-            fence->context == entity->fence_context + 1) {
-                /*
-                 * Fence is a scheduled/finished fence from a job
-                 * which belongs to the same entity, we can ignore
-                 * fences from ourself
-                 */
-		dma_fence_put(entity->dependency);
-		return false;
-	}
-
-	s_fence = to_drm_sched_fence(fence);
-	if (s_fence && s_fence->sched == sched) {
-
-		/*
-		 * Fence is from the same scheduler, only need to wait for
-		 * it to be scheduled
-		 */
-		fence = dma_fence_get(&s_fence->scheduled);
-		dma_fence_put(entity->dependency);
-		entity->dependency = fence;
-		if (!dma_fence_add_callback(fence, &entity->cb,
-					    drm_sched_entity_clear_dep))
-			return true;
-
-		/* Ignore it when it is already scheduled */
-		dma_fence_put(fence);
-		return false;
-	}
-
-	if (!dma_fence_add_callback(entity->dependency, &entity->cb,
-				    drm_sched_entity_wakeup))
-		return true;
-
-	dma_fence_put(entity->dependency);
-	return false;
-}
-
-static struct drm_sched_job *
-drm_sched_entity_pop_job(struct drm_sched_entity *entity)
-{
-	struct drm_gpu_scheduler *sched = entity->rq->sched;
-	struct drm_sched_job *sched_job = to_drm_sched_job(
-						spsc_queue_peek(&entity->job_queue));
-
-	if (!sched_job)
-		return NULL;
-
-	while ((entity->dependency = sched->ops->dependency(sched_job, entity))) {
-		if (drm_sched_entity_add_dependency_cb(entity)) {
-
-			trace_drm_sched_job_wait_dep(sched_job, entity->dependency);
-			return NULL;
-		}
-	}
-
-	/* skip jobs from entity that marked guilty */
-	if (entity->guilty && atomic_read(entity->guilty))
-		dma_fence_set_error(&sched_job->s_fence->finished, -ECANCELED);
-
-	dma_fence_put(entity->last_scheduled);
-	entity->last_scheduled = dma_fence_get(&sched_job->s_fence->finished);
-
-	spsc_queue_pop(&entity->job_queue);
-	return sched_job;
-}
-
-/**
- * drm_sched_entity_select_rq - select a new rq for the entity
- *
- * @entity: scheduler entity
- *
- * Check all prerequisites and select a new rq for the entity for load
- * balancing.
- */
-static void drm_sched_entity_select_rq(struct drm_sched_entity *entity)
-{
-	struct dma_fence *fence;
-	struct drm_sched_rq *rq;
-
-	if (!spsc_queue_count(&entity->job_queue) == 0 ||
-	    entity->num_rq_list <= 1)
-		return;
-
-	fence = READ_ONCE(entity->last_scheduled);
-	if (fence && !dma_fence_is_signaled(fence))
-		return;
-
-	rq = drm_sched_entity_get_free_sched(entity);
-	spin_lock(&entity->rq_lock);
-	drm_sched_rq_remove_entity(entity->rq, entity);
-	entity->rq = rq;
-	spin_unlock(&entity->rq_lock);
-}
-
-/**
- * drm_sched_entity_push_job - Submit a job to the entity's job queue
- *
- * @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
- * called with drm_sched_job_init under common lock.
- *
- * Returns 0 for success, negative error code otherwise.
- */
-void drm_sched_entity_push_job(struct drm_sched_job *sched_job,
-			       struct drm_sched_entity *entity)
-{
-	bool first;
-
-	trace_drm_sched_job(sched_job, entity);
-	atomic_inc(&entity->rq->sched->num_jobs);
-	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);
-		drm_sched_rq_add_entity(entity->rq, entity);
-		spin_unlock(&entity->rq_lock);
-		drm_sched_wakeup(entity->rq->sched);
-	}
-}
-EXPORT_SYMBOL(drm_sched_entity_push_job);
-
 /* job_finish is called after hw fence signaled
  */
 static void drm_sched_job_finish(struct work_struct *work)
@@ -840,7 +409,7 @@ static bool drm_sched_ready(struct drm_gpu_scheduler *sched)
  * @sched: scheduler instance
  *
  */
-static void drm_sched_wakeup(struct drm_gpu_scheduler *sched)
+void drm_sched_wakeup(struct drm_gpu_scheduler *sched)
 {
 	if (drm_sched_ready(sched))
 		wake_up_interruptible(&sched->wake_up_worker);
diff --git a/drivers/gpu/drm/scheduler/sched_entity.c b/drivers/gpu/drm/scheduler/sched_entity.c
new file mode 100644
index 000000000000..1053f27af9df
--- /dev/null
+++ b/drivers/gpu/drm/scheduler/sched_entity.c
@@ -0,0 +1,459 @@
+/*
+ * Copyright 2015 Advanced Micro Devices, Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ */
+
+#include <linux/kthread.h>
+#include <drm/gpu_scheduler.h>
+
+#include "gpu_scheduler_trace.h"
+
+#define to_drm_sched_job(sched_job)		\
+		container_of((sched_job), struct drm_sched_job, queue_node)
+
+/**
+ * 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
+ *
+ * Note: the rq_list should have atleast one element to schedule
+ *       the entity
+ *
+ * Returns 0 on success or a negative error code on failure.
+*/
+int drm_sched_entity_init(struct drm_sched_entity *entity,
+			  struct drm_sched_rq **rq_list,
+			  unsigned int num_rq_list,
+			  atomic_t *guilty)
+{
+	int i;
+
+	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_list[0];
+	entity->guilty = guilty;
+	entity->num_rq_list = num_rq_list;
+	entity->rq_list = kcalloc(num_rq_list, sizeof(struct drm_sched_rq *),
+				GFP_KERNEL);
+	if (!entity->rq_list)
+		return -ENOMEM;
+
+	for (i = 0; i < num_rq_list; ++i)
+		entity->rq_list[i] = rq_list[i];
+	entity->last_scheduled = NULL;
+
+	spin_lock_init(&entity->rq_lock);
+	spsc_queue_init(&entity->job_queue);
+
+	atomic_set(&entity->fence_seq, 0);
+	entity->fence_context = dma_fence_context_alloc(2);
+
+	return 0;
+}
+EXPORT_SYMBOL(drm_sched_entity_init);
+
+/**
+ * drm_sched_entity_is_idle - Check if entity is idle
+ *
+ * @entity: scheduler entity
+ *
+ * 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 (list_empty(&entity->list) ||
+	    spsc_queue_peek(&entity->job_queue) == NULL)
+		return true;
+
+	return false;
+}
+
+/**
+ * drm_sched_entity_is_ready - Check if entity is ready
+ *
+ * @entity: scheduler entity
+ *
+ * Return true if entity could provide a job.
+ */
+bool drm_sched_entity_is_ready(struct drm_sched_entity *entity)
+{
+	if (spsc_queue_peek(&entity->job_queue) == NULL)
+		return false;
+
+	if (READ_ONCE(entity->dependency))
+		return false;
+
+	return true;
+}
+
+/**
+ * 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_rq_list; ++i) {
+		num_jobs = atomic_read(&entity->rq_list[i]->sched->num_jobs);
+		if (num_jobs < min_jobs) {
+			min_jobs = num_jobs;
+			rq = entity->rq_list[i];
+		}
+	}
+
+	return rq;
+}
+
+static void drm_sched_entity_kill_jobs_cb(struct dma_fence *f,
+				    struct dma_fence_cb *cb)
+{
+	struct drm_sched_job *job = container_of(cb, struct drm_sched_job,
+						 finish_cb);
+	drm_sched_fence_finished(job->s_fence);
+	WARN_ON(job->s_fence->parent);
+	dma_fence_put(&job->s_fence->finished);
+	job->sched->ops->free_job(job);
+}
+
+
+/**
+ * drm_sched_entity_flush - Flush a context 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 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
+ */
+long drm_sched_entity_flush(struct drm_sched_entity *entity, long timeout)
+{
+	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_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_flush);
+
+/**
+ * drm_sched_entity_cleanup - Destroy a context entity
+ *
+ * @entity: 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.
+ *
+ */
+void drm_sched_entity_fini(struct drm_sched_entity *entity)
+{
+	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;
+
+		/* Park the kernel for a moment to make sure it isn't processing
+		 * our enity.
+		 */
+		kthread_park(sched->thread);
+		kthread_unpark(sched->thread);
+		if (entity->dependency) {
+			dma_fence_remove_callback(entity->dependency,
+						  &entity->cb);
+			dma_fence_put(entity->dependency);
+			entity->dependency = NULL;
+		}
+
+		while ((job = to_drm_sched_job(spsc_queue_pop(&entity->job_queue)))) {
+			struct drm_sched_fence *s_fence = job->s_fence;
+			drm_sched_fence_scheduled(s_fence);
+			dma_fence_set_error(&s_fence->finished, -ESRCH);
+
+			/*
+			 * 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 {
+				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;
+	kfree(entity->rq_list);
+}
+EXPORT_SYMBOL(drm_sched_entity_fini);
+
+/**
+ * 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_flush(entity, MAX_WAIT_SCHED_ENTITY_Q_EMPTY);
+	drm_sched_entity_fini(entity);
+}
+EXPORT_SYMBOL(drm_sched_entity_destroy);
+
+static void drm_sched_entity_wakeup(struct dma_fence *f, struct dma_fence_cb *cb)
+{
+	struct drm_sched_entity *entity =
+		container_of(cb, struct drm_sched_entity, cb);
+	entity->dependency = NULL;
+	dma_fence_put(f);
+	drm_sched_wakeup(entity->rq->sched);
+}
+
+static void drm_sched_entity_clear_dep(struct dma_fence *f, struct dma_fence_cb *cb)
+{
+	struct drm_sched_entity *entity =
+		container_of(cb, struct drm_sched_entity, cb);
+	entity->dependency = NULL;
+	dma_fence_put(f);
+}
+
+/**
+ * drm_sched_entity_set_rq_priority - helper for drm_sched_entity_set_priority
+ */
+static void drm_sched_entity_set_rq_priority(struct drm_sched_rq **rq,
+					     enum drm_sched_priority priority)
+{
+	*rq = &(*rq)->sched->sched_rq[priority];
+}
+
+/**
+ * drm_sched_entity_set_priority - Sets priority of the entity
+ *
+ * @entity: scheduler entity
+ * @priority: scheduler priority
+ *
+ * Update the priority of runqueus used for the entity.
+ */
+void drm_sched_entity_set_priority(struct drm_sched_entity *entity,
+				   enum drm_sched_priority priority)
+{
+	unsigned int i;
+
+	spin_lock(&entity->rq_lock);
+
+	for (i = 0; i < entity->num_rq_list; ++i)
+		drm_sched_entity_set_rq_priority(&entity->rq_list[i], priority);
+
+	drm_sched_rq_remove_entity(entity->rq, entity);
+	drm_sched_entity_set_rq_priority(&entity->rq, priority);
+	drm_sched_rq_add_entity(entity->rq, entity);
+
+	spin_unlock(&entity->rq_lock);
+}
+EXPORT_SYMBOL(drm_sched_entity_set_priority);
+
+static bool drm_sched_entity_add_dependency_cb(struct drm_sched_entity *entity)
+{
+	struct drm_gpu_scheduler *sched = entity->rq->sched;
+	struct dma_fence * fence = entity->dependency;
+	struct drm_sched_fence *s_fence;
+
+	if (fence->context == entity->fence_context ||
+            fence->context == entity->fence_context + 1) {
+                /*
+                 * Fence is a scheduled/finished fence from a job
+                 * which belongs to the same entity, we can ignore
+                 * fences from ourself
+                 */
+		dma_fence_put(entity->dependency);
+		return false;
+	}
+
+	s_fence = to_drm_sched_fence(fence);
+	if (s_fence && s_fence->sched == sched) {
+
+		/*
+		 * Fence is from the same scheduler, only need to wait for
+		 * it to be scheduled
+		 */
+		fence = dma_fence_get(&s_fence->scheduled);
+		dma_fence_put(entity->dependency);
+		entity->dependency = fence;
+		if (!dma_fence_add_callback(fence, &entity->cb,
+					    drm_sched_entity_clear_dep))
+			return true;
+
+		/* Ignore it when it is already scheduled */
+		dma_fence_put(fence);
+		return false;
+	}
+
+	if (!dma_fence_add_callback(entity->dependency, &entity->cb,
+				    drm_sched_entity_wakeup))
+		return true;
+
+	dma_fence_put(entity->dependency);
+	return false;
+}
+
+struct drm_sched_job *drm_sched_entity_pop_job(struct drm_sched_entity *entity)
+{
+	struct drm_gpu_scheduler *sched = entity->rq->sched;
+	struct drm_sched_job *sched_job = to_drm_sched_job(
+						spsc_queue_peek(&entity->job_queue));
+
+	if (!sched_job)
+		return NULL;
+
+	while ((entity->dependency = sched->ops->dependency(sched_job, entity))) {
+		if (drm_sched_entity_add_dependency_cb(entity)) {
+
+			trace_drm_sched_job_wait_dep(sched_job, entity->dependency);
+			return NULL;
+		}
+	}
+
+	/* skip jobs from entity that marked guilty */
+	if (entity->guilty && atomic_read(entity->guilty))
+		dma_fence_set_error(&sched_job->s_fence->finished, -ECANCELED);
+
+	dma_fence_put(entity->last_scheduled);
+	entity->last_scheduled = dma_fence_get(&sched_job->s_fence->finished);
+
+	spsc_queue_pop(&entity->job_queue);
+	return sched_job;
+}
+
+/**
+ * drm_sched_entity_select_rq - select a new rq for the entity
+ *
+ * @entity: scheduler entity
+ *
+ * Check all prerequisites and select a new rq for the entity for load
+ * balancing.
+ */
+void drm_sched_entity_select_rq(struct drm_sched_entity *entity)
+{
+	struct dma_fence *fence;
+	struct drm_sched_rq *rq;
+
+	if (!spsc_queue_count(&entity->job_queue) == 0 ||
+	    entity->num_rq_list <= 1)
+		return;
+
+	fence = READ_ONCE(entity->last_scheduled);
+	if (fence && !dma_fence_is_signaled(fence))
+		return;
+
+	rq = drm_sched_entity_get_free_sched(entity);
+	spin_lock(&entity->rq_lock);
+	drm_sched_rq_remove_entity(entity->rq, entity);
+	entity->rq = rq;
+	spin_unlock(&entity->rq_lock);
+}
+
+/**
+ * drm_sched_entity_push_job - Submit a job to the entity's job queue
+ *
+ * @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
+ * called with drm_sched_job_init under common lock.
+ *
+ * Returns 0 for success, negative error code otherwise.
+ */
+void drm_sched_entity_push_job(struct drm_sched_job *sched_job,
+			       struct drm_sched_entity *entity)
+{
+	bool first;
+
+	trace_drm_sched_job(sched_job, entity);
+	atomic_inc(&entity->rq->sched->num_jobs);
+	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);
+		drm_sched_rq_add_entity(entity->rq, entity);
+		spin_unlock(&entity->rq_lock);
+		drm_sched_wakeup(entity->rq->sched);
+	}
+}
+EXPORT_SYMBOL(drm_sched_entity_push_job);