[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)
{
	char name[20];

	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);
	snprintf(name, sizeof(name), "c_entity[%llu]", entity->fence_context);
	memcpy(entity->name, name, 20);
	entity->need_wakeup = false;
	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
 *
 * return 0 if succeed. negative error code on failure
 */
int amd_sched_entity_fini(struct amd_gpu_scheduler *sched,
			    struct amd_sched_entity *entity)
{
	struct amd_sched_rq *rq = entity->belongto_rq;
	long r;

	if (!amd_sched_entity_is_initialized(sched, entity))
		return 0;
	entity->need_wakeup = true;
	/**
	 * The client will not queue more IBs during this fini, consume existing
	 * queued IBs
	*/
	r = wait_event_timeout(entity->wait_queue,
		amd_sched_entity_is_idle(entity),
		msecs_to_jiffies(AMD_GPU_WAIT_IDLE_TIMEOUT_IN_MS));

	if (r <= 0)
		DRM_INFO("Entity %p is in waiting state during fini\n",
			 entity);

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

/**
 * Submit a normal job to the job queue
 *
 * @sched	The pointer to the scheduler
 * @c_entity    The pointer to amd_sched_entity
 * @job		The pointer to job required to submit
 * return 0 if succeed. -1 if failed.
 *        -2 indicate queue is full for this client, client should wait untill
 *	     scheduler consum some queued command.
 *	  -1 other fail.
*/
int amd_sched_push_job(struct amd_sched_job *sched_job)
{
	struct amd_sched_fence 	*fence =
		amd_sched_fence_create(sched_job->s_entity);
	if (!fence)
		return -EINVAL;
	fence_get(&fence->base);
	sched_job->s_fence = fence;
	while (kfifo_in_spinlocked(&sched_job->s_entity->job_queue,
				   &sched_job, sizeof(void *),
				   &sched_job->s_entity->queue_lock) !=
	       sizeof(void *)) {
		/**
		 * Current context used up all its IB slots
		 * wait here, or need to check whether GPU is hung
		*/
		schedule();
	}
	/* first job wake up scheduler */
	if ((kfifo_len(&sched_job->s_entity->job_queue) / sizeof(void *)) == 1)
		wake_up_interruptible(&sched_job->sched->wait_queue);
	return 0;
}

/**
 * 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);
		}

		if (c_entity->need_wakeup) {
			c_entity->need_wakeup = false;
			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)
{
	struct amd_gpu_scheduler *sched;
	char name[20];

	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;
	snprintf(name, sizeof(name), "gpu_sched[%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, 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	{
f556cb0c	112	char name[20];
a72ce6f8 JZ	113
	114	if (!(sched && entity && rq))
	115	return -EINVAL;
	116
91404fb2	117	memset(entity, 0, sizeof(struct amd_sched_entity));
91404fb2	118	entity->belongto_rq = rq;
a72ce6f8 JZ	119	entity->scheduler = sched;
a72ce6f8 JZ	120	init_waitqueue_head(&entity->wait_queue);
f556cb0c CZ	121	entity->fence_context = fence_context_alloc(1);
	122	snprintf(name, sizeof(name), "c_entity[%llu]", entity->fence_context);
	123	memcpy(entity->name, name, 20);
1c8f805a	124	entity->need_wakeup = false;
a72ce6f8	125	if(kfifo_alloc(&entity->job_queue,
1333f723	126	jobs * sizeof(void *),
a72ce6f8 JZ	127	GFP_KERNEL))
	128	return -EINVAL;
	129
	130	spin_lock_init(&entity->queue_lock);
ce882e6d	131	atomic_set(&entity->fence_seq, 0);
a72ce6f8 JZ	132
a72ce6f8 JZ	133	/* Add the entity to the run queue */
432a4ff8	134	amd_sched_rq_add_entity(rq, entity);
a72ce6f8 JZ	135	return 0;
	136	}
	137
	138	/**
	139	* Query if entity is initialized
	140	*
	141	* @sched Pointer to scheduler instance
	142	* @entity The pointer to a valid scheduler entity
	143	*
	144	* return true if entity is initialized, false otherwise
	145	*/
d54fdb94 CK	146	static bool amd_sched_entity_is_initialized(struct amd_gpu_scheduler *sched,
d54fdb94 CK	147	struct amd_sched_entity *entity)
a72ce6f8 JZ	148	{
a72ce6f8 JZ	149	return entity->scheduler == sched &&
91404fb2	150	entity->belongto_rq != NULL;
a72ce6f8 JZ	151	}
a72ce6f8 JZ	152
aef4852e CK	153	/**
	154	* Check if entity is idle
	155	*
	156	* @entity The pointer to a valid scheduler entity
	157	*
	158	* Return true if entity don't has any unscheduled jobs.
	159	*/
	160	static bool amd_sched_entity_is_idle(struct amd_sched_entity *entity)
a72ce6f8	161	{
aef4852e CK	162	rmb();
aef4852e CK	163	if (kfifo_is_empty(&entity->job_queue))
a72ce6f8 JZ	164	return true;
	165
	166	return false;
	167	}
	168
	169	/**
	170	* Destroy a context entity
	171	*
	172	* @sched Pointer to scheduler instance
	173	* @entity The pointer to a valid scheduler entity
	174	*
	175	* return 0 if succeed. negative error code on failure
	176	*/
91404fb2 CK	177	int amd_sched_entity_fini(struct amd_gpu_scheduler *sched,
91404fb2 CK	178	struct amd_sched_entity *entity)
a72ce6f8	179	{
432a4ff8	180	struct amd_sched_rq *rq = entity->belongto_rq;
aef4852e	181	long r;
a72ce6f8	182
d54fdb94	183	if (!amd_sched_entity_is_initialized(sched, entity))
a72ce6f8	184	return 0;
1c8f805a	185	entity->need_wakeup = true;
a72ce6f8 JZ	186	/**
	187	* The client will not queue more IBs during this fini, consume existing
	188	* queued IBs
	189	*/
aef4852e CK	190	r = wait_event_timeout(entity->wait_queue,
	191	amd_sched_entity_is_idle(entity),
	192	msecs_to_jiffies(AMD_GPU_WAIT_IDLE_TIMEOUT_IN_MS));
a72ce6f8	193
aef4852e	194	if (r <= 0)
9788ec40 CK	195	DRM_INFO("Entity %p is in waiting state during fini\n",
9788ec40 CK	196	entity);
a72ce6f8	197
432a4ff8	198	amd_sched_rq_remove_entity(rq, entity);
a72ce6f8 JZ	199	kfifo_free(&entity->job_queue);
	200	return r;
	201	}
	202
	203	/**
	204	* Submit a normal job to the job queue
	205	*
	206	* @sched The pointer to the scheduler
91404fb2	207	* @c_entity The pointer to amd_sched_entity
a72ce6f8	208	* @job The pointer to job required to submit
80de5913 CZ	209	* return 0 if succeed. -1 if failed.
	210	* -2 indicate queue is full for this client, client should wait untill
	211	* scheduler consum some queued command.
	212	* -1 other fail.
a72ce6f8	213	*/
bb977d37	214	int amd_sched_push_job(struct amd_sched_job *sched_job)
a72ce6f8	215	{
bb977d37 CZ	216	struct amd_sched_fence *fence =
bb977d37 CZ	217	amd_sched_fence_create(sched_job->s_entity);
f556cb0c CZ	218	if (!fence)
f556cb0c CZ	219	return -EINVAL;
bb977d37 CZ	220	fence_get(&fence->base);
	221	sched_job->s_fence = fence;
	222	while (kfifo_in_spinlocked(&sched_job->s_entity->job_queue,
	223	&sched_job, sizeof(void *),
	224	&sched_job->s_entity->queue_lock) !=
	225	sizeof(void *)) {
a72ce6f8 JZ	226	/**
	227	* Current context used up all its IB slots
	228	* wait here, or need to check whether GPU is hung
	229	*/
	230	schedule();
	231	}
1c8f805a	232	/* first job wake up scheduler */
bb977d37 CZ	233	if ((kfifo_len(&sched_job->s_entity->job_queue) / sizeof(void *)) == 1)
bb977d37 CZ	234	wake_up_interruptible(&sched_job->sched->wait_queue);
80de5913	235	return 0;
a72ce6f8 JZ	236	}
a72ce6f8 JZ	237
e688b728 CK	238	/**
	239	* Return ture if we can push more jobs to the hw.
	240	*/
	241	static bool amd_sched_ready(struct amd_gpu_scheduler *sched)
	242	{
	243	return atomic_read(&sched->hw_rq_count) <
	244	sched->hw_submission_limit;
	245	}
	246
	247	/**
	248	* Select next entity containing real IB submissions
	249	*/
	250	static struct amd_sched_entity *
	251	amd_sched_select_context(struct amd_gpu_scheduler *sched)
	252	{
	253	struct amd_sched_entity *tmp;
	254
	255	if (!amd_sched_ready(sched))
	256	return NULL;
	257
	258	/* Kernel run queue has higher priority than normal run queue*/
	259	tmp = amd_sched_rq_select_entity(&sched->kernel_rq);
	260	if (tmp == NULL)
	261	tmp = amd_sched_rq_select_entity(&sched->sched_rq);
	262
	263	return tmp;
	264	}
	265
6f0e54a9 CK	266	static void amd_sched_process_job(struct fence f, struct fence_cb cb)
	267	{
	268	struct amd_sched_job *sched_job =
	269	container_of(cb, struct amd_sched_job, cb);
	270	struct amd_gpu_scheduler *sched;
6f0e54a9 CK	271
6f0e54a9 CK	272	sched = sched_job->sched;
f556cb0c	273	amd_sched_fence_signal(sched_job->s_fence);
c746ba22	274	atomic_dec(&sched->hw_rq_count);
f556cb0c	275	fence_put(&sched_job->s_fence->base);
bb977d37	276	sched->ops->process_job(sched, sched_job);
6f0e54a9 CK	277	wake_up_interruptible(&sched->wait_queue);
	278	}
	279
a72ce6f8 JZ	280	static int amd_sched_main(void *param)
a72ce6f8 JZ	281	{
a72ce6f8	282	struct sched_param sparam = {.sched_priority = 1};
a72ce6f8	283	struct amd_gpu_scheduler sched = (struct amd_gpu_scheduler )param;
f85a6dd9	284	int r;
a72ce6f8 JZ	285
	286	sched_setscheduler(current, SCHED_FIFO, &sparam);
	287
	288	while (!kthread_should_stop()) {
f85a6dd9 CK	289	struct amd_sched_entity *c_entity = NULL;
f85a6dd9 CK	290	struct amd_sched_job *job;
6f0e54a9 CK	291	struct fence *fence;
6f0e54a9 CK	292
a72ce6f8	293	wait_event_interruptible(sched->wait_queue,
f85a6dd9 CK	294	kthread_should_stop() \|\|
	295	(c_entity = amd_sched_select_context(sched)));
	296
	297	if (!c_entity)
	298	continue;
	299
a72ce6f8 JZ	300	r = kfifo_out(&c_entity->job_queue, &job, sizeof(void *));
	301	if (r != sizeof(void *))
	302	continue;
b034b572 CK	303	atomic_inc(&sched->hw_rq_count);
b034b572 CK	304
953e8fd4	305	fence = sched->ops->run_job(sched, c_entity, job);
6f0e54a9	306	if (fence) {
953e8fd4	307	r = fence_add_callback(fence, &job->cb,
6f0e54a9 CK	308	amd_sched_process_job);
6f0e54a9 CK	309	if (r == -ENOENT)
953e8fd4	310	amd_sched_process_job(fence, &job->cb);
6f0e54a9 CK	311	else if (r)
	312	DRM_ERROR("fence add callback failed (%d)\n", r);
	313	fence_put(fence);
	314	}
aef4852e CK	315
	316	if (c_entity->need_wakeup) {
	317	c_entity->need_wakeup = false;
	318	wake_up(&c_entity->wait_queue);
	319	}
	320
a72ce6f8 JZ	321	}
	322	return 0;
	323	}
	324
a72ce6f8 JZ	325	/**
	326	* Create a gpu scheduler
	327	*
69f7dd65 CK	328	* @ops The backend operations for this scheduler.
	329	* @ring The the ring id for the scheduler.
	330	* @hw_submissions Number of hw submissions to do.
a72ce6f8	331	*
69f7dd65	332	* Return the pointer to scheduler for success, otherwise return NULL
a72ce6f8	333	*/
69f7dd65 CK	334	struct amd_gpu_scheduler amd_sched_create(struct amd_sched_backend_ops ops,
69f7dd65 CK	335	unsigned ring, unsigned hw_submission)
a72ce6f8 JZ	336	{
a72ce6f8 JZ	337	struct amd_gpu_scheduler *sched;
4cd7f42c	338	char name[20];
a72ce6f8 JZ	339
	340	sched = kzalloc(sizeof(struct amd_gpu_scheduler), GFP_KERNEL);
	341	if (!sched)
	342	return NULL;
	343
a72ce6f8	344	sched->ops = ops;
a72ce6f8	345	sched->ring_id = ring;
4cef9267	346	sched->hw_submission_limit = hw_submission;
a72ce6f8	347	snprintf(name, sizeof(name), "gpu_sched[%d]", ring);
432a4ff8 CK	348	amd_sched_rq_init(&sched->sched_rq);
432a4ff8 CK	349	amd_sched_rq_init(&sched->kernel_rq);
a72ce6f8 JZ	350
a72ce6f8 JZ	351	init_waitqueue_head(&sched->wait_queue);
c746ba22	352	atomic_set(&sched->hw_rq_count, 0);
a72ce6f8	353	/* Each scheduler will run on a seperate kernel thread */
f4956598 CK	354	sched->thread = kthread_run(amd_sched_main, sched, name);
	355	if (IS_ERR(sched->thread)) {
	356	DRM_ERROR("Failed to create scheduler for id %d.\n", ring);
	357	kfree(sched);
	358	return NULL;
a72ce6f8 JZ	359	}
a72ce6f8 JZ	360
f4956598	361	return sched;
a72ce6f8 JZ	362	}
	363
	364	/**
	365	* Destroy a gpu scheduler
	366	*
	367	* @sched The pointer to the scheduler
	368	*
	369	* return 0 if succeed. -1 if failed.
	370	*/
	371	int amd_sched_destroy(struct amd_gpu_scheduler *sched)
	372	{
	373	kthread_stop(sched->thread);
a72ce6f8 JZ	374	kfree(sched);
	375	return 0;
	376	}