[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"

#define CREATE_TRACE_POINTS
#include "gpu_sched_trace.h"

static struct amd_sched_job *
amd_sched_entity_pop_job(struct amd_sched_entity *entity);
static void amd_sched_wakeup(struct amd_gpu_scheduler *sched);

/* 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 job from a specified run queue with round robin policy.
 * Return NULL if nothing available.
 */
static struct amd_sched_job *
amd_sched_rq_select_job(struct amd_sched_rq *rq)
{
	struct amd_sched_entity *entity;
	struct amd_sched_job *job;

	spin_lock(&rq->lock);

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

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

		job = amd_sched_entity_pop_job(entity);
		if (job) {
			rq->current_entity = entity;
			spin_unlock(&rq->lock);
			return job;
		}

		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;
	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(sched->job_scheduled, amd_sched_entity_is_idle(entity));

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

static void amd_sched_entity_wakeup(struct fence *f, struct fence_cb *cb)
{
	struct amd_sched_entity *entity =
		container_of(cb, struct amd_sched_entity, cb);
	entity->dependency = NULL;
	fence_put(f);
	amd_sched_wakeup(entity->scheduler);
}

static struct amd_sched_job *
amd_sched_entity_pop_job(struct amd_sched_entity *entity)
{
	struct amd_gpu_scheduler *sched = entity->scheduler;
	struct amd_sched_job *job;

	if (ACCESS_ONCE(entity->dependency))
		return NULL;

	if (!kfifo_out_peek(&entity->job_queue, &job, sizeof(job)))
		return NULL;

	while ((entity->dependency = sched->ops->dependency(job))) {

		if (fence_add_callback(entity->dependency, &entity->cb,
				       amd_sched_entity_wakeup))
			fence_put(entity->dependency);
		else
			return NULL;
	}

	return job;
}

/**
 * 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)
		amd_sched_wakeup(job->sched);

	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);

	if (!fence)
		return -ENOMEM;

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

	wait_event(entity->scheduler->job_scheduled,
		   amd_sched_entity_in(sched_job));
	trace_amd_sched_job(sched_job);
	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;
}

/**
 * Wake up the scheduler when it is ready
 */
static void amd_sched_wakeup(struct amd_gpu_scheduler *sched)
{
	if (amd_sched_ready(sched))
		wake_up_interruptible(&sched->wake_up_worker);
}

/**
 * Select next to run
*/
static struct amd_sched_job *
amd_sched_select_job(struct amd_gpu_scheduler *sched)
{
	struct amd_sched_job *job;

	if (!amd_sched_ready(sched))
		return NULL;

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

	return job;
}

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_job);
	wake_up_interruptible(&sched->wake_up_worker);
}

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, count;

	sched_setscheduler(current, SCHED_FIFO, &sparam);

	while (!kthread_should_stop()) {
		struct amd_sched_entity *entity;
		struct amd_sched_job *job;
		struct fence *fence;

		wait_event_interruptible(sched->wake_up_worker,
			kthread_should_stop() ||
			(job = amd_sched_select_job(sched)));

		if (!job)
			continue;

		entity = job->s_entity;
		atomic_inc(&sched->hw_rq_count);
		fence = sched->ops->run_job(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);
		} else {
			DRM_ERROR("Failed to run job!\n");
			amd_sched_process_job(NULL, &job->cb);
		}

		count = kfifo_out(&entity->job_queue, &job, sizeof(job));
		WARN_ON(count != sizeof(job));
		wake_up(&sched->job_scheduled);
	}
	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->wake_up_worker);
	init_waitqueue_head(&sched->job_scheduled);
	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
353da3c5 CZ	30	#define CREATE_TRACE_POINTS
	31	#include "gpu_sched_trace.h"
	32
69bd5bf1 CK	33	static struct amd_sched_job *
69bd5bf1 CK	34	amd_sched_entity_pop_job(struct amd_sched_entity *entity);
88079006 CK	35	static void amd_sched_wakeup(struct amd_gpu_scheduler *sched);
88079006 CK	36
a72ce6f8	37	/* Initialize a given run queue struct */
432a4ff8	38	static void amd_sched_rq_init(struct amd_sched_rq *rq)
a72ce6f8	39	{
2b184d8d	40	spin_lock_init(&rq->lock);
432a4ff8	41	INIT_LIST_HEAD(&rq->entities);
432a4ff8	42	rq->current_entity = NULL;
a72ce6f8 JZ	43	}
a72ce6f8 JZ	44
432a4ff8 CK	45	static void amd_sched_rq_add_entity(struct amd_sched_rq *rq,
432a4ff8 CK	46	struct amd_sched_entity *entity)
a72ce6f8	47	{
2b184d8d	48	spin_lock(&rq->lock);
432a4ff8	49	list_add_tail(&entity->list, &rq->entities);
2b184d8d	50	spin_unlock(&rq->lock);
a72ce6f8 JZ	51	}
a72ce6f8 JZ	52
432a4ff8 CK	53	static void amd_sched_rq_remove_entity(struct amd_sched_rq *rq,
432a4ff8 CK	54	struct amd_sched_entity *entity)
a72ce6f8	55	{
2b184d8d	56	spin_lock(&rq->lock);
432a4ff8 CK	57	list_del_init(&entity->list);
	58	if (rq->current_entity == entity)
	59	rq->current_entity = NULL;
2b184d8d	60	spin_unlock(&rq->lock);
a72ce6f8 JZ	61	}
	62
	63	/**
69bd5bf1 CK	64	* Select next job from a specified run queue with round robin policy.
69bd5bf1 CK	65	* Return NULL if nothing available.
a72ce6f8	66	*/
69bd5bf1 CK	67	static struct amd_sched_job *
69bd5bf1 CK	68	amd_sched_rq_select_job(struct amd_sched_rq *rq)
a72ce6f8	69	{
2b184d8d	70	struct amd_sched_entity *entity;
69bd5bf1	71	struct amd_sched_job *job;
432a4ff8	72
2b184d8d CK	73	spin_lock(&rq->lock);
	74
	75	entity = rq->current_entity;
432a4ff8 CK	76	if (entity) {
432a4ff8 CK	77	list_for_each_entry_continue(entity, &rq->entities, list) {
69bd5bf1 CK	78	job = amd_sched_entity_pop_job(entity);
69bd5bf1 CK	79	if (job) {
432a4ff8	80	rq->current_entity = entity;
2b184d8d	81	spin_unlock(&rq->lock);
69bd5bf1	82	return job;
432a4ff8	83	}
a72ce6f8	84	}
a72ce6f8	85	}
a72ce6f8	86
432a4ff8	87	list_for_each_entry(entity, &rq->entities, list) {
a72ce6f8	88
69bd5bf1 CK	89	job = amd_sched_entity_pop_job(entity);
69bd5bf1 CK	90	if (job) {
432a4ff8	91	rq->current_entity = entity;
2b184d8d	92	spin_unlock(&rq->lock);
69bd5bf1	93	return job;
432a4ff8	94	}
a72ce6f8	95
432a4ff8 CK	96	if (entity == rq->current_entity)
	97	break;
	98	}
a72ce6f8	99
2b184d8d CK	100	spin_unlock(&rq->lock);
2b184d8d CK	101
432a4ff8	102	return NULL;
a72ce6f8 JZ	103	}
a72ce6f8 JZ	104
a72ce6f8 JZ	105	/**
	106	* Init a context entity used by scheduler when submit to HW ring.
	107	*
	108	* @sched The pointer to the scheduler
91404fb2	109	* @entity The pointer to a valid amd_sched_entity
a72ce6f8	110	* @rq The run queue this entity belongs
0e89d0c1	111	* @kernel If this is an entity for the kernel
1333f723	112	* @jobs The max number of jobs in the job queue
a72ce6f8 JZ	113	*
	114	* return 0 if succeed. negative error code on failure
	115	*/
91404fb2	116	int amd_sched_entity_init(struct amd_gpu_scheduler *sched,
6f0e54a9	117	struct amd_sched_entity *entity,
432a4ff8	118	struct amd_sched_rq *rq,
6f0e54a9	119	uint32_t jobs)
a72ce6f8	120	{
a72ce6f8 JZ	121	if (!(sched && entity && rq))
	122	return -EINVAL;
	123
91404fb2	124	memset(entity, 0, sizeof(struct amd_sched_entity));
91404fb2	125	entity->belongto_rq = rq;
a72ce6f8	126	entity->scheduler = sched;
f556cb0c	127	entity->fence_context = fence_context_alloc(1);
a72ce6f8	128	if(kfifo_alloc(&entity->job_queue,
1333f723	129	jobs * sizeof(void *),
a72ce6f8 JZ	130	GFP_KERNEL))
	131	return -EINVAL;
	132
	133	spin_lock_init(&entity->queue_lock);
ce882e6d	134	atomic_set(&entity->fence_seq, 0);
a72ce6f8 JZ	135
a72ce6f8 JZ	136	/* Add the entity to the run queue */
432a4ff8	137	amd_sched_rq_add_entity(rq, entity);
a72ce6f8 JZ	138	return 0;
	139	}
	140
	141	/**
	142	* Query if entity is initialized
	143	*
	144	* @sched Pointer to scheduler instance
	145	* @entity The pointer to a valid scheduler entity
	146	*
	147	* return true if entity is initialized, false otherwise
	148	*/
d54fdb94 CK	149	static bool amd_sched_entity_is_initialized(struct amd_gpu_scheduler *sched,
d54fdb94 CK	150	struct amd_sched_entity *entity)
a72ce6f8 JZ	151	{
a72ce6f8 JZ	152	return entity->scheduler == sched &&
91404fb2	153	entity->belongto_rq != NULL;
a72ce6f8 JZ	154	}
a72ce6f8 JZ	155
aef4852e CK	156	/**
	157	* Check if entity is idle
	158	*
	159	* @entity The pointer to a valid scheduler entity
	160	*
	161	* Return true if entity don't has any unscheduled jobs.
	162	*/
	163	static bool amd_sched_entity_is_idle(struct amd_sched_entity *entity)
a72ce6f8	164	{
aef4852e CK	165	rmb();
aef4852e CK	166	if (kfifo_is_empty(&entity->job_queue))
a72ce6f8 JZ	167	return true;
	168
	169	return false;
	170	}
	171
	172	/**
	173	* Destroy a context entity
	174	*
	175	* @sched Pointer to scheduler instance
	176	* @entity The pointer to a valid scheduler entity
	177	*
062c7fb3	178	* Cleanup and free the allocated resources.
a72ce6f8	179	*/
062c7fb3 CK	180	void amd_sched_entity_fini(struct amd_gpu_scheduler *sched,
062c7fb3 CK	181	struct amd_sched_entity *entity)
a72ce6f8	182	{
432a4ff8	183	struct amd_sched_rq *rq = entity->belongto_rq;
a72ce6f8	184
d54fdb94	185	if (!amd_sched_entity_is_initialized(sched, entity))
062c7fb3	186	return;
6c859274	187
a72ce6f8 JZ	188	/**
	189	* The client will not queue more IBs during this fini, consume existing
	190	* queued IBs
	191	*/
c2b6bd7e	192	wait_event(sched->job_scheduled, amd_sched_entity_is_idle(entity));
a72ce6f8	193
432a4ff8	194	amd_sched_rq_remove_entity(rq, entity);
a72ce6f8	195	kfifo_free(&entity->job_queue);
a72ce6f8 JZ	196	}
a72ce6f8 JZ	197
e61235db CK	198	static void amd_sched_entity_wakeup(struct fence f, struct fence_cb cb)
	199	{
	200	struct amd_sched_entity *entity =
	201	container_of(cb, struct amd_sched_entity, cb);
	202	entity->dependency = NULL;
	203	fence_put(f);
	204	amd_sched_wakeup(entity->scheduler);
	205	}
	206
69bd5bf1 CK	207	static struct amd_sched_job *
	208	amd_sched_entity_pop_job(struct amd_sched_entity *entity)
	209	{
e61235db	210	struct amd_gpu_scheduler *sched = entity->scheduler;
69bd5bf1 CK	211	struct amd_sched_job *job;
69bd5bf1 CK	212
e61235db CK	213	if (ACCESS_ONCE(entity->dependency))
	214	return NULL;
	215
69bd5bf1 CK	216	if (!kfifo_out_peek(&entity->job_queue, &job, sizeof(job)))
	217	return NULL;
	218
e61235db CK	219	while ((entity->dependency = sched->ops->dependency(job))) {
	220
	221	if (fence_add_callback(entity->dependency, &entity->cb,
	222	amd_sched_entity_wakeup))
	223	fence_put(entity->dependency);
	224	else
	225	return NULL;
	226	}
	227
69bd5bf1 CK	228	return job;
	229	}
	230
a72ce6f8	231	/**
6c859274	232	* Helper to submit a job to the job queue
a72ce6f8	233	*
a72ce6f8	234	* @job The pointer to job required to submit
6c859274 CK	235	*
	236	* Returns true if we could submit the job.
	237	*/
	238	static bool amd_sched_entity_in(struct amd_sched_job *job)
a72ce6f8	239	{
6c859274 CK	240	struct amd_sched_entity *entity = job->s_entity;
	241	bool added, first = false;
	242
	243	spin_lock(&entity->queue_lock);
	244	added = kfifo_in(&entity->job_queue, &job, sizeof(job)) == sizeof(job);
	245
	246	if (added && kfifo_len(&entity->job_queue) == sizeof(job))
	247	first = true;
	248
	249	spin_unlock(&entity->queue_lock);
	250
	251	/* first job wakes up scheduler */
	252	if (first)
88079006	253	amd_sched_wakeup(job->sched);
6c859274 CK	254
	255	return added;
	256	}
	257
	258	/**
	259	* Submit a job to the job queue
	260	*
	261	* @job The pointer to job required to submit
	262	*
	263	* Returns 0 for success, negative error code otherwise.
	264	*/
	265	int amd_sched_entity_push_job(struct amd_sched_job *sched_job)
	266	{
	267	struct amd_sched_entity *entity = sched_job->s_entity;
84f76ea6 CZ	268	struct amd_sched_fence *fence = amd_sched_fence_create(
84f76ea6 CZ	269	entity, sched_job->owner);
6c859274	270
f556cb0c	271	if (!fence)
6c859274 CK	272	return -ENOMEM;
6c859274 CK	273
bb977d37 CZ	274	fence_get(&fence->base);
bb977d37 CZ	275	sched_job->s_fence = fence;
6c859274	276
c9f0fe5e CZ	277	wait_event(entity->scheduler->job_scheduled,
c9f0fe5e CZ	278	amd_sched_entity_in(sched_job));
353da3c5	279	trace_amd_sched_job(sched_job);
c9f0fe5e	280	return 0;
a72ce6f8 JZ	281	}
a72ce6f8 JZ	282
e688b728 CK	283	/**
	284	* Return ture if we can push more jobs to the hw.
	285	*/
	286	static bool amd_sched_ready(struct amd_gpu_scheduler *sched)
	287	{
	288	return atomic_read(&sched->hw_rq_count) <
	289	sched->hw_submission_limit;
	290	}
	291
88079006 CK	292	/**
	293	* Wake up the scheduler when it is ready
	294	*/
	295	static void amd_sched_wakeup(struct amd_gpu_scheduler *sched)
	296	{
	297	if (amd_sched_ready(sched))
c2b6bd7e	298	wake_up_interruptible(&sched->wake_up_worker);
88079006 CK	299	}
88079006 CK	300
e688b728	301	/**
69bd5bf1	302	* Select next to run
e688b728	303	*/
69bd5bf1 CK	304	static struct amd_sched_job *
69bd5bf1 CK	305	amd_sched_select_job(struct amd_gpu_scheduler *sched)
e688b728	306	{
69bd5bf1	307	struct amd_sched_job *job;
e688b728 CK	308
	309	if (!amd_sched_ready(sched))
	310	return NULL;
	311
	312	/* Kernel run queue has higher priority than normal run queue*/
69bd5bf1 CK	313	job = amd_sched_rq_select_job(&sched->kernel_rq);
	314	if (job == NULL)
	315	job = amd_sched_rq_select_job(&sched->sched_rq);
e688b728	316
69bd5bf1	317	return job;
e688b728 CK	318	}
e688b728 CK	319
6f0e54a9 CK	320	static void amd_sched_process_job(struct fence f, struct fence_cb cb)
	321	{
	322	struct amd_sched_job *sched_job =
	323	container_of(cb, struct amd_sched_job, cb);
	324	struct amd_gpu_scheduler *sched;
6f0e54a9 CK	325
6f0e54a9 CK	326	sched = sched_job->sched;
f556cb0c	327	amd_sched_fence_signal(sched_job->s_fence);
c746ba22	328	atomic_dec(&sched->hw_rq_count);
f556cb0c	329	fence_put(&sched_job->s_fence->base);
bd755d08	330	sched->ops->process_job(sched_job);
c2b6bd7e	331	wake_up_interruptible(&sched->wake_up_worker);
6f0e54a9 CK	332	}
6f0e54a9 CK	333
a72ce6f8 JZ	334	static int amd_sched_main(void *param)
a72ce6f8 JZ	335	{
a72ce6f8	336	struct sched_param sparam = {.sched_priority = 1};
a72ce6f8	337	struct amd_gpu_scheduler sched = (struct amd_gpu_scheduler )param;
5134e999	338	int r, count;
a72ce6f8 JZ	339
	340	sched_setscheduler(current, SCHED_FIFO, &sparam);
	341
	342	while (!kthread_should_stop()) {
69bd5bf1	343	struct amd_sched_entity *entity;
f85a6dd9	344	struct amd_sched_job *job;
6f0e54a9 CK	345	struct fence *fence;
6f0e54a9 CK	346
c2b6bd7e	347	wait_event_interruptible(sched->wake_up_worker,
f85a6dd9	348	kthread_should_stop() \|\|
69bd5bf1	349	(job = amd_sched_select_job(sched)));
f85a6dd9	350
69bd5bf1	351	if (!job)
f85a6dd9 CK	352	continue;
f85a6dd9 CK	353
69bd5bf1	354	entity = job->s_entity;
b034b572	355	atomic_inc(&sched->hw_rq_count);
bd755d08	356	fence = sched->ops->run_job(job);
6f0e54a9	357	if (fence) {
953e8fd4	358	r = fence_add_callback(fence, &job->cb,
6f0e54a9 CK	359	amd_sched_process_job);
6f0e54a9 CK	360	if (r == -ENOENT)
953e8fd4	361	amd_sched_process_job(fence, &job->cb);
6f0e54a9 CK	362	else if (r)
	363	DRM_ERROR("fence add callback failed (%d)\n", r);
	364	fence_put(fence);
27439fca CK	365	} else {
	366	DRM_ERROR("Failed to run job!\n");
	367	amd_sched_process_job(NULL, &job->cb);
6f0e54a9	368	}
aef4852e	369
5134e999 AD	370	count = kfifo_out(&entity->job_queue, &job, sizeof(job));
5134e999 AD	371	WARN_ON(count != sizeof(job));
c2b6bd7e	372	wake_up(&sched->job_scheduled);
a72ce6f8 JZ	373	}
	374	return 0;
	375	}
	376
a72ce6f8 JZ	377	/**
	378	* Create a gpu scheduler
	379	*
69f7dd65 CK	380	* @ops The backend operations for this scheduler.
	381	* @ring The the ring id for the scheduler.
	382	* @hw_submissions Number of hw submissions to do.
a72ce6f8	383	*
69f7dd65	384	* Return the pointer to scheduler for success, otherwise return NULL
a72ce6f8	385	*/
69f7dd65	386	struct amd_gpu_scheduler amd_sched_create(struct amd_sched_backend_ops ops,
f38fdfdd CZ	387	unsigned ring, unsigned hw_submission,
f38fdfdd CZ	388	void *priv)
a72ce6f8 JZ	389	{
a72ce6f8 JZ	390	struct amd_gpu_scheduler *sched;
a72ce6f8 JZ	391
	392	sched = kzalloc(sizeof(struct amd_gpu_scheduler), GFP_KERNEL);
	393	if (!sched)
	394	return NULL;
	395
a72ce6f8	396	sched->ops = ops;
a72ce6f8	397	sched->ring_id = ring;
4cef9267	398	sched->hw_submission_limit = hw_submission;
f38fdfdd	399	sched->priv = priv;
c14692f0	400	snprintf(sched->name, sizeof(sched->name), "amdgpu[%d]", ring);
432a4ff8 CK	401	amd_sched_rq_init(&sched->sched_rq);
432a4ff8 CK	402	amd_sched_rq_init(&sched->kernel_rq);
a72ce6f8	403
c2b6bd7e CK	404	init_waitqueue_head(&sched->wake_up_worker);
c2b6bd7e CK	405	init_waitqueue_head(&sched->job_scheduled);
c746ba22	406	atomic_set(&sched->hw_rq_count, 0);
a72ce6f8	407	/* Each scheduler will run on a seperate kernel thread */
c14692f0	408	sched->thread = kthread_run(amd_sched_main, sched, sched->name);
f4956598 CK	409	if (IS_ERR(sched->thread)) {
	410	DRM_ERROR("Failed to create scheduler for id %d.\n", ring);
	411	kfree(sched);
	412	return NULL;
a72ce6f8 JZ	413	}
a72ce6f8 JZ	414
f4956598	415	return sched;
a72ce6f8 JZ	416	}
	417
	418	/**
	419	* Destroy a gpu scheduler
	420	*
	421	* @sched The pointer to the scheduler
	422	*
	423	* return 0 if succeed. -1 if failed.
	424	*/
	425	int amd_sched_destroy(struct amd_gpu_scheduler *sched)
	426	{
	427	kthread_stop(sched->thread);
a72ce6f8 JZ	428	kfree(sched);
	429	return 0;
	430	}