[mirror_ubuntu-focal-kernel.git] / drivers / gpu / drm / amd / scheduler / gpu_scheduler.c

/*
 * 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 <linux/wait.h>
#include <linux/sched.h>
#include <drm/drmP.h>
#include "gpu_scheduler.h"

/* Initialize a given run queue struct */
static void amd_sched_rq_init(struct amd_sched_rq *rq)
{
	spin_lock_init(&rq->lock);
	INIT_LIST_HEAD(&rq->entities);
	rq->current_entity = NULL;
}

static void amd_sched_rq_add_entity(struct amd_sched_rq *rq,
				    struct amd_sched_entity *entity)
{
	spin_lock(&rq->lock);
	list_add_tail(&entity->list, &rq->entities);
	spin_unlock(&rq->lock);
}

static void amd_sched_rq_remove_entity(struct amd_sched_rq *rq,
				       struct amd_sched_entity *entity)
{
	spin_lock(&rq->lock);
	list_del_init(&entity->list);
	if (rq->current_entity == entity)
		rq->current_entity = NULL;
	spin_unlock(&rq->lock);
}

/**
 * Select next entity from a specified run queue with round robin policy.
 * It could return the same entity as current one if current is the only
 * available one in the queue. Return NULL if nothing available.
 */
static struct amd_sched_entity *
amd_sched_rq_select_entity(struct amd_sched_rq *rq)
{
	struct amd_sched_entity *entity;

	spin_lock(&rq->lock);

	entity = rq->current_entity;
	if (entity) {
		list_for_each_entry_continue(entity, &rq->entities, list) {
			if (!kfifo_is_empty(&entity->job_queue)) {
				rq->current_entity = entity;
				spin_unlock(&rq->lock);
				return rq->current_entity;
			}
		}
	}

	list_for_each_entry(entity, &rq->entities, list) {

		if (!kfifo_is_empty(&entity->job_queue)) {
			rq->current_entity = entity;
			spin_unlock(&rq->lock);
			return rq->current_entity;
		}

		if (entity == rq->current_entity)
			break;
	}

	spin_unlock(&rq->lock);

	return NULL;
}

/**
 * Init a context entity used by scheduler when submit to HW ring.
 *
 * @sched	The pointer to the scheduler
 * @entity	The pointer to a valid amd_sched_entity
 * @rq		The run queue this entity belongs
 * @kernel	If this is an entity for the kernel
 * @jobs	The max number of jobs in the job queue
 *
 * return 0 if succeed. negative error code on failure
*/
int amd_sched_entity_init(struct amd_gpu_scheduler *sched,
			  struct amd_sched_entity *entity,
			  struct amd_sched_rq *rq,
			  uint32_t jobs)
{
	if (!(sched && entity && rq))
		return -EINVAL;

	memset(entity, 0, sizeof(struct amd_sched_entity));
	entity->belongto_rq = rq;
	entity->scheduler = sched;
	init_waitqueue_head(&entity->wait_queue);
	entity->fence_context = fence_context_alloc(1);
	if(kfifo_alloc(&entity->job_queue,
		       jobs * sizeof(void *),
		       GFP_KERNEL))
		return -EINVAL;

	spin_lock_init(&entity->queue_lock);
	atomic_set(&entity->fence_seq, 0);

	/* Add the entity to the run queue */
	amd_sched_rq_add_entity(rq, entity);
	return 0;
}

/**
 * Query if entity is initialized
 *
 * @sched       Pointer to scheduler instance
 * @entity	The pointer to a valid scheduler entity
 *
 * return true if entity is initialized, false otherwise
*/
static bool amd_sched_entity_is_initialized(struct amd_gpu_scheduler *sched,
					    struct amd_sched_entity *entity)
{
	return entity->scheduler == sched &&
		entity->belongto_rq != NULL;
}

/**
 * Check if entity is idle
 *
 * @entity	The pointer to a valid scheduler entity
 *
 * Return true if entity don't has any unscheduled jobs.
 */
static bool amd_sched_entity_is_idle(struct amd_sched_entity *entity)
{
	rmb();
	if (kfifo_is_empty(&entity->job_queue))
		return true;

	return false;
}

/**
 * Destroy a context entity
 *
 * @sched       Pointer to scheduler instance
 * @entity	The pointer to a valid scheduler entity
 *
 * Cleanup and free the allocated resources.
 */
void amd_sched_entity_fini(struct amd_gpu_scheduler *sched,
			   struct amd_sched_entity *entity)
{
	struct amd_sched_rq *rq = entity->belongto_rq;

	if (!amd_sched_entity_is_initialized(sched, entity))
		return;

	/**
	 * The client will not queue more IBs during this fini, consume existing
	 * queued IBs
	*/
	wait_event(entity->wait_queue, amd_sched_entity_is_idle(entity));

	amd_sched_rq_remove_entity(rq, entity);
	kfifo_free(&entity->job_queue);
}

/**
 * Helper to submit a job to the job queue
 *
 * @job		The pointer to job required to submit
 *
 * Returns true if we could submit the job.
 */
static bool amd_sched_entity_in(struct amd_sched_job *job)
{
	struct amd_sched_entity *entity = job->s_entity;
	bool added, first = false;

	spin_lock(&entity->queue_lock);
	added = kfifo_in(&entity->job_queue, &job, sizeof(job)) == sizeof(job);

	if (added && kfifo_len(&entity->job_queue) == sizeof(job))
		first = true;

	spin_unlock(&entity->queue_lock);

	/* first job wakes up scheduler */
	if (first)
		wake_up_interruptible(&job->sched->wait_queue);

	return added;
}

/**
 * Submit a job to the job queue
 *
 * @job		The pointer to job required to submit
 *
 * Returns 0 for success, negative error code otherwise.
 */
int amd_sched_entity_push_job(struct amd_sched_job *sched_job)
{
	struct amd_sched_entity *entity = sched_job->s_entity;
	struct amd_sched_fence *fence = amd_sched_fence_create(
		entity, sched_job->owner);
	int r;

	if (!fence)
		return -ENOMEM;

	fence_get(&fence->base);
	sched_job->s_fence = fence;

	r = wait_event_interruptible(entity->wait_queue,
				     amd_sched_entity_in(sched_job));

	return r;
}

/**
 * Return ture if we can push more jobs to the hw.
 */
static bool amd_sched_ready(struct amd_gpu_scheduler *sched)
{
	return atomic_read(&sched->hw_rq_count) <
		sched->hw_submission_limit;
}

/**
 * Select next entity containing real IB submissions
*/
static struct amd_sched_entity *
amd_sched_select_context(struct amd_gpu_scheduler *sched)
{
	struct amd_sched_entity *tmp;

	if (!amd_sched_ready(sched))
		return NULL;

	/* Kernel run queue has higher priority than normal run queue*/
	tmp = amd_sched_rq_select_entity(&sched->kernel_rq);
	if (tmp == NULL)
		tmp = amd_sched_rq_select_entity(&sched->sched_rq);

	return tmp;
}

static void amd_sched_process_job(struct fence *f, struct fence_cb *cb)
{
	struct amd_sched_job *sched_job =
		container_of(cb, struct amd_sched_job, cb);
	struct amd_gpu_scheduler *sched;

	sched = sched_job->sched;
	amd_sched_fence_signal(sched_job->s_fence);
	atomic_dec(&sched->hw_rq_count);
	fence_put(&sched_job->s_fence->base);
	sched->ops->process_job(sched, sched_job);
	wake_up_interruptible(&sched->wait_queue);
}

static int amd_sched_main(void *param)
{
	struct sched_param sparam = {.sched_priority = 1};
	struct amd_gpu_scheduler *sched = (struct amd_gpu_scheduler *)param;
	int r;

	sched_setscheduler(current, SCHED_FIFO, &sparam);

	while (!kthread_should_stop()) {
		struct amd_sched_entity *c_entity = NULL;
		struct amd_sched_job *job;
		struct fence *fence;

		wait_event_interruptible(sched->wait_queue,
			kthread_should_stop() ||
			(c_entity = amd_sched_select_context(sched)));

		if (!c_entity)
			continue;

		r = kfifo_out(&c_entity->job_queue, &job, sizeof(void *));
		if (r != sizeof(void *))
			continue;
		atomic_inc(&sched->hw_rq_count);

		fence = sched->ops->run_job(sched, c_entity, job);
		if (fence) {
			r = fence_add_callback(fence, &job->cb,
					       amd_sched_process_job);
			if (r == -ENOENT)
				amd_sched_process_job(fence, &job->cb);
			else if (r)
				DRM_ERROR("fence add callback failed (%d)\n", r);
			fence_put(fence);
		}

		wake_up(&c_entity->wait_queue);
	}
	return 0;
}

/**
 * Create a gpu scheduler
 *
 * @ops			The backend operations for this scheduler.
 * @ring		The the ring id for the scheduler.
 * @hw_submissions	Number of hw submissions to do.
 *
 * Return the pointer to scheduler for success, otherwise return NULL
*/
struct amd_gpu_scheduler *amd_sched_create(struct amd_sched_backend_ops *ops,
					   unsigned ring, unsigned hw_submission,
					   void *priv)
{
	struct amd_gpu_scheduler *sched;

	sched = kzalloc(sizeof(struct amd_gpu_scheduler), GFP_KERNEL);
	if (!sched)
		return NULL;

	sched->ops = ops;
	sched->ring_id = ring;
	sched->hw_submission_limit = hw_submission;
	sched->priv = priv;
	snprintf(sched->name, sizeof(sched->name), "amdgpu[%d]", ring);
	amd_sched_rq_init(&sched->sched_rq);
	amd_sched_rq_init(&sched->kernel_rq);

	init_waitqueue_head(&sched->wait_queue);
	atomic_set(&sched->hw_rq_count, 0);
	/* Each scheduler will run on a seperate kernel thread */
	sched->thread = kthread_run(amd_sched_main, sched, sched->name);
	if (IS_ERR(sched->thread)) {
		DRM_ERROR("Failed to create scheduler for id %d.\n", ring);
		kfree(sched);
		return NULL;
	}

	return sched;
}

/**
 * Destroy a gpu scheduler
 *
 * @sched	The pointer to the scheduler
 *
 * return 0 if succeed. -1 if failed.
 */
int amd_sched_destroy(struct amd_gpu_scheduler *sched)
{
	kthread_stop(sched->thread);
	kfree(sched);
	return  0;
}
Commit	Line	Data
a72ce6f8 JZ	1	/*
	2	* Copyright 2015 Advanced Micro Devices, Inc.
	3	*
	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
	7	* the rights to use, copy, modify, merge, publish, distribute, sublicense,
	8	* and/or sell copies of the Software, and to permit persons to whom the
	9	* Software is furnished to do so, subject to the following conditions:
	10	*
	11	* The above copyright notice and this permission notice shall be included in
	12	* all copies or substantial portions of the Software.
	13	*
	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
	17	* THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
	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.
	21	*
	22	*
	23	*/
	24	#include <linux/kthread.h>
	25	#include <linux/wait.h>
	26	#include <linux/sched.h>
	27	#include <drm/drmP.h>
	28	#include "gpu_scheduler.h"
	29
	30	/* Initialize a given run queue struct */
432a4ff8	31	static void amd_sched_rq_init(struct amd_sched_rq *rq)
a72ce6f8	32	{
2b184d8d	33	spin_lock_init(&rq->lock);
432a4ff8	34	INIT_LIST_HEAD(&rq->entities);
432a4ff8	35	rq->current_entity = NULL;
a72ce6f8 JZ	36	}
a72ce6f8 JZ	37
432a4ff8 CK	38	static void amd_sched_rq_add_entity(struct amd_sched_rq *rq,
432a4ff8 CK	39	struct amd_sched_entity *entity)
a72ce6f8	40	{
2b184d8d	41	spin_lock(&rq->lock);
432a4ff8	42	list_add_tail(&entity->list, &rq->entities);
2b184d8d	43	spin_unlock(&rq->lock);
a72ce6f8 JZ	44	}
a72ce6f8 JZ	45
432a4ff8 CK	46	static void amd_sched_rq_remove_entity(struct amd_sched_rq *rq,
432a4ff8 CK	47	struct amd_sched_entity *entity)
a72ce6f8	48	{
2b184d8d	49	spin_lock(&rq->lock);
432a4ff8 CK	50	list_del_init(&entity->list);
	51	if (rq->current_entity == entity)
	52	rq->current_entity = NULL;
2b184d8d	53	spin_unlock(&rq->lock);
a72ce6f8 JZ	54	}
	55
	56	/**
	57	* Select next entity from a specified run queue with round robin policy.
	58	* It could return the same entity as current one if current is the only
	59	* available one in the queue. Return NULL if nothing available.
	60	*/
432a4ff8 CK	61	static struct amd_sched_entity *
432a4ff8 CK	62	amd_sched_rq_select_entity(struct amd_sched_rq *rq)
a72ce6f8	63	{
2b184d8d	64	struct amd_sched_entity *entity;
432a4ff8	65
2b184d8d CK	66	spin_lock(&rq->lock);
	67
	68	entity = rq->current_entity;
432a4ff8 CK	69	if (entity) {
	70	list_for_each_entry_continue(entity, &rq->entities, list) {
	71	if (!kfifo_is_empty(&entity->job_queue)) {
	72	rq->current_entity = entity;
2b184d8d	73	spin_unlock(&rq->lock);
432a4ff8 CK	74	return rq->current_entity;
432a4ff8 CK	75	}
a72ce6f8	76	}
a72ce6f8	77	}
a72ce6f8	78
432a4ff8	79	list_for_each_entry(entity, &rq->entities, list) {
a72ce6f8	80
432a4ff8 CK	81	if (!kfifo_is_empty(&entity->job_queue)) {
432a4ff8 CK	82	rq->current_entity = entity;
2b184d8d	83	spin_unlock(&rq->lock);
432a4ff8 CK	84	return rq->current_entity;
432a4ff8 CK	85	}
a72ce6f8	86
432a4ff8 CK	87	if (entity == rq->current_entity)
	88	break;
	89	}
a72ce6f8	90
2b184d8d CK	91	spin_unlock(&rq->lock);
2b184d8d CK	92
432a4ff8	93	return NULL;
a72ce6f8 JZ	94	}
a72ce6f8 JZ	95
a72ce6f8 JZ	96	/**
	97	* Init a context entity used by scheduler when submit to HW ring.
	98	*
	99	* @sched The pointer to the scheduler
91404fb2	100	* @entity The pointer to a valid amd_sched_entity
a72ce6f8	101	* @rq The run queue this entity belongs
0e89d0c1	102	* @kernel If this is an entity for the kernel
1333f723	103	* @jobs The max number of jobs in the job queue
a72ce6f8 JZ	104	*
	105	* return 0 if succeed. negative error code on failure
	106	*/
91404fb2	107	int amd_sched_entity_init(struct amd_gpu_scheduler *sched,
6f0e54a9	108	struct amd_sched_entity *entity,
432a4ff8	109	struct amd_sched_rq *rq,
6f0e54a9	110	uint32_t jobs)
a72ce6f8	111	{
a72ce6f8 JZ	112	if (!(sched && entity && rq))
	113	return -EINVAL;
	114
91404fb2	115	memset(entity, 0, sizeof(struct amd_sched_entity));
91404fb2	116	entity->belongto_rq = rq;
a72ce6f8 JZ	117	entity->scheduler = sched;
a72ce6f8 JZ	118	init_waitqueue_head(&entity->wait_queue);
f556cb0c	119	entity->fence_context = fence_context_alloc(1);
a72ce6f8	120	if(kfifo_alloc(&entity->job_queue,
1333f723	121	jobs * sizeof(void *),
a72ce6f8 JZ	122	GFP_KERNEL))
	123	return -EINVAL;
	124
	125	spin_lock_init(&entity->queue_lock);
ce882e6d	126	atomic_set(&entity->fence_seq, 0);
a72ce6f8 JZ	127
a72ce6f8 JZ	128	/* Add the entity to the run queue */
432a4ff8	129	amd_sched_rq_add_entity(rq, entity);
a72ce6f8 JZ	130	return 0;
	131	}
	132
	133	/**
	134	* Query if entity is initialized
	135	*
	136	* @sched Pointer to scheduler instance
	137	* @entity The pointer to a valid scheduler entity
	138	*
	139	* return true if entity is initialized, false otherwise
	140	*/
d54fdb94 CK	141	static bool amd_sched_entity_is_initialized(struct amd_gpu_scheduler *sched,
d54fdb94 CK	142	struct amd_sched_entity *entity)
a72ce6f8 JZ	143	{
a72ce6f8 JZ	144	return entity->scheduler == sched &&
91404fb2	145	entity->belongto_rq != NULL;
a72ce6f8 JZ	146	}
a72ce6f8 JZ	147
aef4852e CK	148	/**
	149	* Check if entity is idle
	150	*
	151	* @entity The pointer to a valid scheduler entity
	152	*
	153	* Return true if entity don't has any unscheduled jobs.
	154	*/
	155	static bool amd_sched_entity_is_idle(struct amd_sched_entity *entity)
a72ce6f8	156	{
aef4852e CK	157	rmb();
aef4852e CK	158	if (kfifo_is_empty(&entity->job_queue))
a72ce6f8 JZ	159	return true;
	160
	161	return false;
	162	}
	163
	164	/**
	165	* Destroy a context entity
	166	*
	167	* @sched Pointer to scheduler instance
	168	* @entity The pointer to a valid scheduler entity
	169	*
062c7fb3	170	* Cleanup and free the allocated resources.
a72ce6f8	171	*/
062c7fb3 CK	172	void amd_sched_entity_fini(struct amd_gpu_scheduler *sched,
062c7fb3 CK	173	struct amd_sched_entity *entity)
a72ce6f8	174	{
432a4ff8	175	struct amd_sched_rq *rq = entity->belongto_rq;
a72ce6f8	176
d54fdb94	177	if (!amd_sched_entity_is_initialized(sched, entity))
062c7fb3	178	return;
6c859274	179
a72ce6f8 JZ	180	/**
	181	* The client will not queue more IBs during this fini, consume existing
	182	* queued IBs
	183	*/
062c7fb3	184	wait_event(entity->wait_queue, amd_sched_entity_is_idle(entity));
a72ce6f8	185
432a4ff8	186	amd_sched_rq_remove_entity(rq, entity);
a72ce6f8	187	kfifo_free(&entity->job_queue);
a72ce6f8 JZ	188	}
	189
	190	/**
6c859274	191	* Helper to submit a job to the job queue
a72ce6f8	192	*
a72ce6f8	193	* @job The pointer to job required to submit
6c859274 CK	194	*
	195	* Returns true if we could submit the job.
	196	*/
	197	static bool amd_sched_entity_in(struct amd_sched_job *job)
a72ce6f8	198	{
6c859274 CK	199	struct amd_sched_entity *entity = job->s_entity;
	200	bool added, first = false;
	201
	202	spin_lock(&entity->queue_lock);
	203	added = kfifo_in(&entity->job_queue, &job, sizeof(job)) == sizeof(job);
	204
	205	if (added && kfifo_len(&entity->job_queue) == sizeof(job))
	206	first = true;
	207
	208	spin_unlock(&entity->queue_lock);
	209
	210	/* first job wakes up scheduler */
	211	if (first)
	212	wake_up_interruptible(&job->sched->wait_queue);
	213
	214	return added;
	215	}
	216
	217	/**
	218	* Submit a job to the job queue
	219	*
	220	* @job The pointer to job required to submit
	221	*
	222	* Returns 0 for success, negative error code otherwise.
	223	*/
	224	int amd_sched_entity_push_job(struct amd_sched_job *sched_job)
	225	{
	226	struct amd_sched_entity *entity = sched_job->s_entity;
84f76ea6 CZ	227	struct amd_sched_fence *fence = amd_sched_fence_create(
84f76ea6 CZ	228	entity, sched_job->owner);
6c859274 CK	229	int r;
6c859274 CK	230
f556cb0c	231	if (!fence)
6c859274 CK	232	return -ENOMEM;
6c859274 CK	233
bb977d37 CZ	234	fence_get(&fence->base);
bb977d37 CZ	235	sched_job->s_fence = fence;
6c859274 CK	236
	237	r = wait_event_interruptible(entity->wait_queue,
	238	amd_sched_entity_in(sched_job));
	239
	240	return r;
a72ce6f8 JZ	241	}
a72ce6f8 JZ	242
e688b728 CK	243	/**
	244	* Return ture if we can push more jobs to the hw.
	245	*/
	246	static bool amd_sched_ready(struct amd_gpu_scheduler *sched)
	247	{
	248	return atomic_read(&sched->hw_rq_count) <
	249	sched->hw_submission_limit;
	250	}
	251
	252	/**
	253	* Select next entity containing real IB submissions
	254	*/
	255	static struct amd_sched_entity *
	256	amd_sched_select_context(struct amd_gpu_scheduler *sched)
	257	{
	258	struct amd_sched_entity *tmp;
	259
	260	if (!amd_sched_ready(sched))
	261	return NULL;
	262
	263	/* Kernel run queue has higher priority than normal run queue*/
	264	tmp = amd_sched_rq_select_entity(&sched->kernel_rq);
	265	if (tmp == NULL)
	266	tmp = amd_sched_rq_select_entity(&sched->sched_rq);
	267
	268	return tmp;
	269	}
	270
6f0e54a9 CK	271	static void amd_sched_process_job(struct fence f, struct fence_cb cb)
	272	{
	273	struct amd_sched_job *sched_job =
	274	container_of(cb, struct amd_sched_job, cb);
	275	struct amd_gpu_scheduler *sched;
6f0e54a9 CK	276
6f0e54a9 CK	277	sched = sched_job->sched;
f556cb0c	278	amd_sched_fence_signal(sched_job->s_fence);
c746ba22	279	atomic_dec(&sched->hw_rq_count);
f556cb0c	280	fence_put(&sched_job->s_fence->base);
bb977d37	281	sched->ops->process_job(sched, sched_job);
6f0e54a9 CK	282	wake_up_interruptible(&sched->wait_queue);
	283	}
	284
a72ce6f8 JZ	285	static int amd_sched_main(void *param)
a72ce6f8 JZ	286	{
a72ce6f8	287	struct sched_param sparam = {.sched_priority = 1};
a72ce6f8	288	struct amd_gpu_scheduler sched = (struct amd_gpu_scheduler )param;
f85a6dd9	289	int r;
a72ce6f8 JZ	290
	291	sched_setscheduler(current, SCHED_FIFO, &sparam);
	292
	293	while (!kthread_should_stop()) {
f85a6dd9 CK	294	struct amd_sched_entity *c_entity = NULL;
f85a6dd9 CK	295	struct amd_sched_job *job;
6f0e54a9 CK	296	struct fence *fence;
6f0e54a9 CK	297
a72ce6f8	298	wait_event_interruptible(sched->wait_queue,
f85a6dd9 CK	299	kthread_should_stop() \|\|
	300	(c_entity = amd_sched_select_context(sched)));
	301
	302	if (!c_entity)
	303	continue;
	304
a72ce6f8 JZ	305	r = kfifo_out(&c_entity->job_queue, &job, sizeof(void *));
	306	if (r != sizeof(void *))
	307	continue;
b034b572 CK	308	atomic_inc(&sched->hw_rq_count);
b034b572 CK	309
953e8fd4	310	fence = sched->ops->run_job(sched, c_entity, job);
6f0e54a9	311	if (fence) {
953e8fd4	312	r = fence_add_callback(fence, &job->cb,
6f0e54a9 CK	313	amd_sched_process_job);
6f0e54a9 CK	314	if (r == -ENOENT)
953e8fd4	315	amd_sched_process_job(fence, &job->cb);
6f0e54a9 CK	316	else if (r)
	317	DRM_ERROR("fence add callback failed (%d)\n", r);
	318	fence_put(fence);
	319	}
aef4852e	320
6c859274	321	wake_up(&c_entity->wait_queue);
a72ce6f8 JZ	322	}
	323	return 0;
	324	}
	325
a72ce6f8 JZ	326	/**
	327	* Create a gpu scheduler
	328	*
69f7dd65 CK	329	* @ops The backend operations for this scheduler.
	330	* @ring The the ring id for the scheduler.
	331	* @hw_submissions Number of hw submissions to do.
a72ce6f8	332	*
69f7dd65	333	* Return the pointer to scheduler for success, otherwise return NULL
a72ce6f8	334	*/
69f7dd65	335	struct amd_gpu_scheduler amd_sched_create(struct amd_sched_backend_ops ops,
f38fdfdd CZ	336	unsigned ring, unsigned hw_submission,
f38fdfdd CZ	337	void *priv)
a72ce6f8 JZ	338	{
a72ce6f8 JZ	339	struct amd_gpu_scheduler *sched;
a72ce6f8 JZ	340
	341	sched = kzalloc(sizeof(struct amd_gpu_scheduler), GFP_KERNEL);
	342	if (!sched)
	343	return NULL;
	344
a72ce6f8	345	sched->ops = ops;
a72ce6f8	346	sched->ring_id = ring;
4cef9267	347	sched->hw_submission_limit = hw_submission;
f38fdfdd	348	sched->priv = priv;
c14692f0	349	snprintf(sched->name, sizeof(sched->name), "amdgpu[%d]", ring);
432a4ff8 CK	350	amd_sched_rq_init(&sched->sched_rq);
432a4ff8 CK	351	amd_sched_rq_init(&sched->kernel_rq);
a72ce6f8 JZ	352
a72ce6f8 JZ	353	init_waitqueue_head(&sched->wait_queue);
c746ba22	354	atomic_set(&sched->hw_rq_count, 0);
a72ce6f8	355	/* Each scheduler will run on a seperate kernel thread */
c14692f0	356	sched->thread = kthread_run(amd_sched_main, sched, sched->name);
f4956598 CK	357	if (IS_ERR(sched->thread)) {
	358	DRM_ERROR("Failed to create scheduler for id %d.\n", ring);
	359	kfree(sched);
	360	return NULL;
a72ce6f8 JZ	361	}
a72ce6f8 JZ	362
f4956598	363	return sched;
a72ce6f8 JZ	364	}
	365
	366	/**
	367	* Destroy a gpu scheduler
	368	*
	369	* @sched The pointer to the scheduler
	370	*
	371	* return 0 if succeed. -1 if failed.
	372	*/
	373	int amd_sched_destroy(struct amd_gpu_scheduler *sched)
	374	{
	375	kthread_stop(sched->thread);
a72ce6f8 JZ	376	kfree(sched);
	377	return 0;
	378	}