Release 4.17 drivers/gpu/drm/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 <uapi/linux/sched/types.h>
#include <drm/drmP.h>
#include <drm/gpu_scheduler.h>
#include <drm/spsc_queue.h>


#define CREATE_TRACE_POINTS
#include <drm/gpu_scheduler_trace.h>


#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);

/* Initialize a given run queue struct */


static void drm_sched_rq_init(struct drm_sched_rq *rq)
{
	spin_lock_init(&rq->lock);
	INIT_LIST_HEAD(&rq->entities);
	rq->current_entity = NULL;
}

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Jammy Zhou
26
78.79%
1
25.00%
Christian König
5
15.15%
2
50.00%
Lucas Stach
2
6.06%
1
25.00%
Total
33
100.00%
4
100.00%



static void drm_sched_rq_add_entity(struct drm_sched_rq *rq,
				    struct drm_sched_entity *entity)
{
	if (!list_empty(&entity->list))
		return;
	spin_lock(&rq->lock);
	list_add_tail(&entity->list, &rq->entities);
	spin_unlock(&rq->lock);
}

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Jammy Zhou
30
52.63%
1
20.00%
Chunming Zhou
12
21.05%
1
20.00%
Christian König
12
21.05%
2
40.00%
Lucas Stach
3
5.26%
1
20.00%
Total
57
100.00%
5
100.00%



static void drm_sched_rq_remove_entity(struct drm_sched_rq *rq,
				       struct drm_sched_entity *entity)
{
	if (list_empty(&entity->list))
		return;
	spin_lock(&rq->lock);
	list_del_init(&entity->list);
	if (rq->current_entity == entity)
		rq->current_entity = NULL;
	spin_unlock(&rq->lock);
}

Contributors
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Jammy Zhou
27
41.54%
1
20.00%
Christian König
24
36.92%
2
40.00%
Chunming Zhou
11
16.92%
1
20.00%
Lucas Stach
3
4.62%
1
20.00%
Total
65
100.00%
5
100.00%

/**
 * Select an entity which could provide a job to run
 *
 * @rq          The run queue to check.
 *
 * Try to find a ready entity, returns NULL if none found.
 */

static struct drm_sched_entity *

drm_sched_rq_select_entity(struct drm_sched_rq *rq)
{
	struct drm_sched_entity *entity;

	spin_lock(&rq->lock);

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

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

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

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

	spin_unlock(&rq->lock);

	return NULL;
}

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Christian König
78
60.00%
4
66.67%
Jammy Zhou
46
35.38%
1
16.67%
Lucas Stach
6
4.62%
1
16.67%
Total
130
100.00%
6
100.00%

/**
 * Init a context entity used by scheduler when submit to HW ring.
 *
 * @sched       The pointer to the scheduler
 * @entity      The pointer to a valid drm_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 drm_sched_entity_init(struct drm_gpu_scheduler *sched,
			  struct drm_sched_entity *entity,
			  struct drm_sched_rq *rq,
			  uint32_t jobs, atomic_t *guilty)
{
	if (!(sched && entity && rq))
		return -EINVAL;

	memset(entity, 0, sizeof(struct drm_sched_entity));
	INIT_LIST_HEAD(&entity->list);
	entity->rq = rq;
	entity->sched = sched;
	entity->guilty = guilty;

	spin_lock_init(&entity->rq_lock);
	spin_lock_init(&entity->queue_lock);
	spsc_queue_init(&entity->job_queue);

	atomic_set(&entity->fence_seq, 0);
	entity->fence_context = dma_fence_context_alloc(2);

	return 0;
}
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Jammy Zhou
65
51.18%
2
18.18%
Christian König
26
20.47%
3
27.27%
Chunming Zhou
11
8.66%
1
9.09%
Monk Liu
10
7.87%
1
9.09%
Andres Rodriguez
8
6.30%
1
9.09%
Lucas Stach
5
3.94%
1
9.09%
Andrey Grodzovsky
1
0.79%
1
9.09%
Chris Wilson
1
0.79%
1
9.09%
Total
127
100.00%
11
100.00%

EXPORT_SYMBOL(drm_sched_entity_init);

/**
 * 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 drm_sched_entity_is_initialized(struct drm_gpu_scheduler *sched,
					    struct drm_sched_entity *entity)
{
	return entity->sched == sched &&
		entity->rq != NULL;
}

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Jammy Zhou
24
82.76%
1
33.33%
Lucas Stach
3
10.34%
1
33.33%
Christian König
2
6.90%
1
33.33%
Total
29
100.00%
3
100.00%

/**
 * 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 drm_sched_entity_is_idle(struct drm_sched_entity *entity)
{
	rmb();
	if (spsc_queue_peek(&entity->job_queue) == NULL)
		return true;

	return false;
}

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CommitProp
Jammy Zhou
26
81.25%
1
25.00%
Andrey Grodzovsky
3
9.38%
1
25.00%
Lucas Stach
2
6.25%
1
25.00%
Christian König
1
3.12%
1
25.00%
Total
32
100.00%
4
100.00%

/**
 * Check if entity is ready
 *
 * @entity      The pointer to a valid 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;
}

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Christian König
35
85.37%
1
25.00%
Andrey Grodzovsky
3
7.32%
1
25.00%
Lucas Stach
2
4.88%
1
25.00%
Mark Rutland
1
2.44%
1
25.00%
Total
41
100.00%
4
100.00%

/**
 * Destroy a context entity
 *
 * @sched       Pointer to scheduler instance
 * @entity      The pointer to a valid scheduler entity
 *
 * Cleanup and free the allocated resources.
 */


void drm_sched_entity_fini(struct drm_gpu_scheduler *sched,
			   struct drm_sched_entity *entity)
{
	int r;

	if (!drm_sched_entity_is_initialized(sched, entity))
		return;
	/**
         * The client will not queue more IBs during this fini, consume existing
         * queued IBs or discard them on SIGKILL
        */
	if ((current->flags & PF_SIGNALED) && current->exit_code == SIGKILL)
		r = -ERESTARTSYS;
	else
		r = wait_event_killable(sched->job_scheduled,
					drm_sched_entity_is_idle(entity));
	drm_sched_entity_set_rq(entity, NULL);
	if (r) {
		struct drm_sched_job *job;

		/* 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);
			drm_sched_fence_finished(s_fence);
			WARN_ON(s_fence->parent);
			dma_fence_put(&s_fence->finished);
			sched->ops->free_job(job);
		}
	}
}
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Christian König
75
36.59%
3
30.00%
Chunming Zhou
40
19.51%
2
20.00%
Jammy Zhou
37
18.05%
1
10.00%
Nicolai Hähnle
35
17.07%
1
10.00%
Lucas Stach
11
5.37%
1
10.00%
Andrey Grodzovsky
6
2.93%
1
10.00%
Andres Rodriguez
1
0.49%
1
10.00%
Total
205
100.00%
10
100.00%

EXPORT_SYMBOL(drm_sched_entity_fini);



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->sched);
}

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Christian König
42
85.71%
2
50.00%
Lucas Stach
4
8.16%
1
25.00%
Chris Wilson
3
6.12%
1
25.00%
Total
49
100.00%
4
100.00%



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);
}

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Monk Liu
36
85.71%
1
33.33%
Lucas Stach
3
7.14%
1
33.33%
Chris Wilson
3
7.14%
1
33.33%
Total
42
100.00%
3
100.00%



void drm_sched_entity_set_rq(struct drm_sched_entity *entity,
			     struct drm_sched_rq *rq)
{
	if (entity->rq == rq)
		return;

	spin_lock(&entity->rq_lock);

	if (entity->rq)
		drm_sched_rq_remove_entity(entity->rq, entity);

	entity->rq = rq;
	if (rq)
		drm_sched_rq_add_entity(rq, entity);

	spin_unlock(&entity->rq_lock);
}
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Andres Rodriguez
67
93.06%
1
50.00%
Lucas Stach
5
6.94%
1
50.00%
Total
72
100.00%
2
100.00%

EXPORT_SYMBOL(drm_sched_entity_set_rq);



bool drm_sched_dependency_optimized(struct dma_fence* fence,
				    struct drm_sched_entity *entity)
{
	struct drm_gpu_scheduler *sched = entity->sched;
	struct drm_sched_fence *s_fence;

	if (!fence || dma_fence_is_signaled(fence))
		return false;
	if (fence->context == entity->fence_context)
		return true;
	s_fence = to_drm_sched_fence(fence);
	if (s_fence && s_fence->sched == sched)
		return true;

	return false;
}
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Chunming Zhou
73
93.59%
1
50.00%
Lucas Stach
5
6.41%
1
50.00%
Total
78
100.00%
2
100.00%

EXPORT_SYMBOL(drm_sched_dependency_optimized);



static bool drm_sched_entity_add_dependency_cb(struct drm_sched_entity *entity)
{
	struct drm_gpu_scheduler *sched = entity->sched;
	struct dma_fence * fence = entity->dependency;
	struct drm_sched_fence *s_fence;

	if (fence->context == entity->fence_context) {
		/* 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;
}

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Christian König
142
90.45%
2
50.00%
Chris Wilson
8
5.10%
1
25.00%
Lucas Stach
7
4.46%
1
25.00%
Total
157
100.00%
4
100.00%


static struct drm_sched_job *

drm_sched_entity_pop_job(struct drm_sched_entity *entity)
{
	struct drm_gpu_scheduler *sched = entity->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))
			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);

	spsc_queue_pop(&entity->job_queue);
	return sched_job;
}

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Christian König
58
51.33%
4
44.44%
Monk Liu
27
23.89%
1
11.11%
Andrey Grodzovsky
18
15.93%
2
22.22%
Lucas Stach
7
6.19%
1
11.11%
Junwei (Martin) Zhang
3
2.65%
1
11.11%
Total
113
100.00%
9
100.00%

/**
 * Submit a job to the job queue
 *
 * @sched_job           The pointer to job required to submit
 *
 * 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)
{
	struct drm_gpu_scheduler *sched = sched_job->sched;
	bool first = false;

	trace_drm_sched_job(sched_job, entity);

	spin_lock(&entity->queue_lock);
	first = spsc_queue_push(&entity->job_queue, &sched_job->queue_node);

	spin_unlock(&entity->queue_lock);

	/* 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(sched);
	}
}
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Christian König
23
21.90%
1
7.69%
Chunming Zhou
22
20.95%
5
38.46%
Andres Rodriguez
16
15.24%
1
7.69%
Jammy Zhou
14
13.33%
1
7.69%
Andrey Grodzovsky
14
13.33%
2
15.38%
Lucas Stach
7
6.67%
1
7.69%
Nicolai Hähnle
7
6.67%
1
7.69%
Junwei (Martin) Zhang
2
1.90%
1
7.69%
Total
105
100.00%
13
100.00%

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)
{
	struct drm_sched_job *s_job = container_of(work, struct drm_sched_job,
						   finish_work);
	struct drm_gpu_scheduler *sched = s_job->sched;

	/* remove job from ring_mirror_list */
	spin_lock(&sched->job_list_lock);
	list_del_init(&s_job->node);
	if (sched->timeout != MAX_SCHEDULE_TIMEOUT) {
		struct drm_sched_job *next;

		spin_unlock(&sched->job_list_lock);
		cancel_delayed_work_sync(&s_job->work_tdr);
		spin_lock(&sched->job_list_lock);

		/* queue TDR for next job */
		next = list_first_entry_or_null(&sched->ring_mirror_list,
						struct drm_sched_job, node);

		if (next)
			schedule_delayed_work(&next->work_tdr, sched->timeout);
	}
	spin_unlock(&sched->job_list_lock);
	dma_fence_put(&s_job->s_fence->finished);
	sched->ops->free_job(s_job);
}

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Monk Liu
73
48.67%
2
25.00%
Christian König
71
47.33%
5
62.50%
Lucas Stach
6
4.00%
1
12.50%
Total
150
100.00%
8
100.00%



static void drm_sched_job_finish_cb(struct dma_fence *f,
				    struct dma_fence_cb *cb)
{
	struct drm_sched_job *job = container_of(cb, struct drm_sched_job,
						 finish_cb);
	schedule_work(&job->finish_work);
}

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Christian König
33
84.62%
1
25.00%
Lucas Stach
3
7.69%
1
25.00%
Chris Wilson
2
5.13%
1
25.00%
Monk Liu
1
2.56%
1
25.00%
Total
39
100.00%
4
100.00%



static void drm_sched_job_begin(struct drm_sched_job *s_job)
{
	struct drm_gpu_scheduler *sched = s_job->sched;

	dma_fence_add_callback(&s_job->s_fence->finished, &s_job->finish_cb,
			       drm_sched_job_finish_cb);

	spin_lock(&sched->job_list_lock);
	list_add_tail(&s_job->node, &sched->ring_mirror_list);
	if (sched->timeout != MAX_SCHEDULE_TIMEOUT &&
	    list_first_entry_or_null(&sched->ring_mirror_list,
				     struct drm_sched_job, node) == s_job)
		schedule_delayed_work(&s_job->work_tdr, sched->timeout);
	spin_unlock(&sched->job_list_lock);
}

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Monk Liu
50
49.50%
1
16.67%
Christian König
30
29.70%
3
50.00%
Nicolai Hähnle
16
15.84%
1
16.67%
Lucas Stach
5
4.95%
1
16.67%
Total
101
100.00%
6
100.00%



static void drm_sched_job_timedout(struct work_struct *work)
{
	struct drm_sched_job *job = container_of(work, struct drm_sched_job,
						 work_tdr.work);

	job->sched->ops->timedout_job(job);
}

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Christian König
36
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1
50.00%
Lucas Stach
3
7.69%
1
50.00%
Total
39
100.00%
2
100.00%



void drm_sched_hw_job_reset(struct drm_gpu_scheduler *sched, struct drm_sched_job *bad)
{
	struct drm_sched_job *s_job;
	struct drm_sched_entity *entity, *tmp;
	int i;

	spin_lock(&sched->job_list_lock);
	list_for_each_entry_reverse(s_job, &sched->ring_mirror_list, node) {
		if (s_job->s_fence->parent &&
		    dma_fence_remove_callback(s_job->s_fence->parent,
					      &s_job->s_fence->cb)) {
			dma_fence_put(s_job->s_fence->parent);
			s_job->s_fence->parent = NULL;
			atomic_dec(&sched->hw_rq_count);
		}
	}
	spin_unlock(&sched->job_list_lock);

	if (bad && bad->s_priority != DRM_SCHED_PRIORITY_KERNEL) {
		atomic_inc(&bad->karma);
		/* don't increase @bad's karma if it's from KERNEL RQ,
                 * becuase sometimes GPU hang would cause kernel jobs (like VM updating jobs)
                 * corrupt but keep in mind that kernel jobs always considered good.
                 */
		for (i = DRM_SCHED_PRIORITY_MIN; i < DRM_SCHED_PRIORITY_KERNEL; i++ ) {
			struct drm_sched_rq *rq = &sched->sched_rq[i];

			spin_lock(&rq->lock);
			list_for_each_entry_safe(entity, tmp, &rq->entities, list) {
				if (bad->s_fence->scheduled.context == entity->fence_context) {
				    if (atomic_read(&bad->karma) > bad->sched->hang_limit)
						if (entity->guilty)
							atomic_set(entity->guilty, 1);
					break;
				}
			}
			spin_unlock(&rq->lock);
			if (&entity->list != &rq->entities)
				break;
		}
	}
}
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160
65.04%
4
40.00%
Chunming Zhou
74
30.08%
3
30.00%
Lucas Stach
9
3.66%
1
10.00%
Chris Wilson
2
0.81%
1
10.00%
Andrey Grodzovsky
1
0.41%
1
10.00%
Total
246
100.00%
10
100.00%

EXPORT_SYMBOL(drm_sched_hw_job_reset);



void drm_sched_job_recovery(struct drm_gpu_scheduler *sched)
{
	struct drm_sched_job *s_job, *tmp;
	bool found_guilty = false;
	int r;

	spin_lock(&sched->job_list_lock);
	s_job = list_first_entry_or_null(&sched->ring_mirror_list,
					 struct drm_sched_job, node);
	if (s_job && sched->timeout != MAX_SCHEDULE_TIMEOUT)
		schedule_delayed_work(&s_job->work_tdr, sched->timeout);

	list_for_each_entry_safe(s_job, tmp, &sched->ring_mirror_list, node) {
		struct drm_sched_fence *s_fence = s_job->s_fence;
		struct dma_fence *fence;
		uint64_t guilty_context;

		if (!found_guilty && atomic_read(&s_job->karma) > sched->hang_limit) {
			found_guilty = true;
			guilty_context = s_job->s_fence->scheduled.context;
		}

		if (found_guilty && s_job->s_fence->scheduled.context == guilty_context)
			dma_fence_set_error(&s_fence->finished, -ECANCELED);

		spin_unlock(&sched->job_list_lock);
		fence = sched->ops->run_job(s_job);
		atomic_inc(&sched->hw_rq_count);
		if (fence) {
			s_fence->parent = dma_fence_get(fence);
			r = dma_fence_add_callback(fence, &s_fence->cb,
						   drm_sched_process_job);
			if (r == -ENOENT)
				drm_sched_process_job(fence, &s_fence->cb);
			else if (r)
				DRM_ERROR("fence add callback failed (%d)\n",
					  r);
			dma_fence_put(fence);
		} else {
			drm_sched_process_job(NULL, &s_fence->cb);
		}
		spin_lock(&sched->job_list_lock);
	}
	spin_unlock(&sched->job_list_lock);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Chunming Zhou
193
69.68%
4
50.00%
Monk Liu
66
23.83%
1
12.50%
Lucas Stach
8
2.89%
1
12.50%
Christian König
6
2.17%
1
12.50%
Chris Wilson
4
1.44%
1
12.50%
Total
277
100.00%
8
100.00%

EXPORT_SYMBOL(drm_sched_job_recovery);

/* init a sched_job with basic field */


int drm_sched_job_init(struct drm_sched_job *job,
		       struct drm_gpu_scheduler *sched,
		       struct drm_sched_entity *entity,
		       void *owner)
{
	job->sched = sched;
	job->s_priority = entity->rq - sched->sched_rq;
	job->s_fence = drm_sched_fence_create(entity, owner);
	if (!job->s_fence)
		return -ENOMEM;
	job->id = atomic64_inc_return(&sched->job_id_count);

	INIT_WORK(&job->finish_work, drm_sched_job_finish);
	INIT_LIST_HEAD(&job->node);
	INIT_DELAYED_WORK(&job->work_tdr, drm_sched_job_timedout);

	return 0;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Monk Liu
46
42.99%
3
33.33%
Christian König
19
17.76%
2
22.22%
Andrey Grodzovsky
12
11.21%
1
11.11%
Andres Rodriguez
12
11.21%
1
11.11%
Chunming Zhou
11
10.28%
1
11.11%
Lucas Stach
7
6.54%
1
11.11%
Total
107
100.00%
9
100.00%

EXPORT_SYMBOL(drm_sched_job_init);

/**
 * Return ture if we can push more jobs to the hw.
 */


static bool drm_sched_ready(struct drm_gpu_scheduler *sched)
{
	return atomic_read(&sched->hw_rq_count) <
		sched->hw_submission_limit;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Christian König
22
91.67%
1
50.00%
Lucas Stach
2
8.33%
1
50.00%
Total
24
100.00%
2
100.00%

/**
 * Wake up the scheduler when it is ready
 */


static void drm_sched_wakeup(struct drm_gpu_scheduler *sched)
{
	if (drm_sched_ready(sched))
		wake_up_interruptible(&sched->wake_up_worker);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Christian König
23
88.46%
2
66.67%
Lucas Stach
3
11.54%
1
33.33%
Total
26
100.00%
3
100.00%

/**
 * Select next entity to process
*/

static struct drm_sched_entity *

drm_sched_select_entity(struct drm_gpu_scheduler *sched)
{
	struct drm_sched_entity *entity;
	int i;

	if (!drm_sched_ready(sched))
		return NULL;

	/* Kernel run queue has higher priority than normal run queue*/
	for (i = DRM_SCHED_PRIORITY_MAX - 1; i >= DRM_SCHED_PRIORITY_MIN; i--) {
		entity = drm_sched_rq_select_entity(&sched->sched_rq[i]);
		if (entity)
			break;
	}

	return entity;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Christian König
40
56.34%
2
40.00%
Chunming Zhou
23
32.39%
2
40.00%
Lucas Stach
8
11.27%
1
20.00%
Total
71
100.00%
5
100.00%



static void drm_sched_process_job(struct dma_fence *f, struct dma_fence_cb *cb)
{
	struct drm_sched_fence *s_fence =
		container_of(cb, struct drm_sched_fence, cb);
	struct drm_gpu_scheduler *sched = s_fence->sched;

	dma_fence_get(&s_fence->finished);
	atomic_dec(&sched->hw_rq_count);
	drm_sched_fence_finished(s_fence);

	trace_drm_sched_process_job(s_fence);
	dma_fence_put(&s_fence->finished);
	wake_up_interruptible(&sched->wake_up_worker);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Christian König
62
75.61%
7
63.64%
Chunming Zhou
11
13.41%
2
18.18%
Lucas Stach
6
7.32%
1
9.09%
Chris Wilson
3
3.66%
1
9.09%
Total
82
100.00%
11
100.00%



static bool drm_sched_blocked(struct drm_gpu_scheduler *sched)
{
	if (kthread_should_park()) {
		kthread_parkme();
		return true;
	}

	return false;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Chunming Zhou
25
92.59%
1
50.00%
Lucas Stach
2
7.41%
1
50.00%
Total
27
100.00%
2
100.00%



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

	sched_setscheduler(current, SCHED_FIFO, &sparam);

	while (!kthread_should_stop()) {
		struct drm_sched_entity *entity = NULL;
		struct drm_sched_fence *s_fence;
		struct drm_sched_job *sched_job;
		struct dma_fence *fence;

		wait_event_interruptible(sched->wake_up_worker,
					 (!drm_sched_blocked(sched) &&
					  (entity = drm_sched_select_entity(sched))) ||
					 kthread_should_stop());

		if (!entity)
			continue;

		sched_job = drm_sched_entity_pop_job(entity);
		if (!sched_job)
			continue;

		s_fence = sched_job->s_fence;

		atomic_inc(&sched->hw_rq_count);
		drm_sched_job_begin(sched_job);

		fence = sched->ops->run_job(sched_job);
		drm_sched_fence_scheduled(s_fence);

		if (fence) {
			s_fence->parent = dma_fence_get(fence);
			r = dma_fence_add_callback(fence, &s_fence->cb,
						   drm_sched_process_job);
			if (r == -ENOENT)
				drm_sched_process_job(fence, &s_fence->cb);
			else if (r)
				DRM_ERROR("fence add callback failed (%d)\n",
					  r);
			dma_fence_put(fence);
		} else {
			drm_sched_process_job(NULL, &s_fence->cb);
		}

		wake_up(&sched->job_scheduled);
	}
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Christian König
107
43.85%
11
57.89%
Jammy Zhou
85
34.84%
2
10.53%
Chunming Zhou
30
12.30%
3
15.79%
Lucas Stach
14
5.74%
1
5.26%
Chris Wilson
4
1.64%
1
5.26%
Junwei (Martin) Zhang
4
1.64%
1
5.26%
Total
244
100.00%
19
100.00%

/**
 * Init a gpu scheduler instance
 *
 * @sched               The pointer to the scheduler
 * @ops                 The backend operations for this scheduler.
 * @hw_submissions      Number of hw submissions to do.
 * @name                Name used for debugging
 *
 * Return 0 on success, otherwise error code.
*/


int drm_sched_init(struct drm_gpu_scheduler *sched,
		   const struct drm_sched_backend_ops *ops,
		   unsigned hw_submission,
		   unsigned hang_limit,
		   long timeout,
		   const char *name)
{
	int i;
	sched->ops = ops;
	sched->hw_submission_limit = hw_submission;
	sched->name = name;
	sched->timeout = timeout;
	sched->hang_limit = hang_limit;
	for (i = DRM_SCHED_PRIORITY_MIN; i < DRM_SCHED_PRIORITY_MAX; i++)
		drm_sched_rq_init(&sched->sched_rq[i]);

	init_waitqueue_head(&sched->wake_up_worker);
	init_waitqueue_head(&sched->job_scheduled);
	INIT_LIST_HEAD(&sched->ring_mirror_list);
	spin_lock_init(&sched->job_list_lock);
	atomic_set(&sched->hw_rq_count, 0);
	atomic64_set(&sched->job_id_count, 0);

	/* Each scheduler will run on a seperate kernel thread */
	sched->thread = kthread_run(drm_sched_main, sched, sched->name);
	if (IS_ERR(sched->thread)) {
		DRM_ERROR("Failed to create scheduler for %s.\n", name);
		return PTR_ERR(sched->thread);
	}

	return 0;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Jammy Zhou
69
37.50%
2
12.50%
Christian König
34
18.48%
5
31.25%
Chunming Zhou
29
15.76%
3
18.75%
Monk Liu
25
13.59%
2
12.50%
Andres Rodriguez
10
5.43%
1
6.25%
Junwei (Martin) Zhang
9
4.89%
1
6.25%
Lucas Stach
7
3.80%
1
6.25%
Nils Wallménius
1
0.54%
1
6.25%
Total
184
100.00%
16
100.00%

EXPORT_SYMBOL(drm_sched_init);

/**
 * Destroy a gpu scheduler
 *
 * @sched       The pointer to the scheduler
 */


void drm_sched_fini(struct drm_gpu_scheduler *sched)
{
	if (sched->thread)
		kthread_stop(sched->thread);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Jammy Zhou
14
60.87%
1
25.00%
Dave Airlie
6
26.09%
1
25.00%
Lucas Stach
2
8.70%
1
25.00%
Christian König
1
4.35%
1
25.00%
Total
23
100.00%
4
100.00%

EXPORT_SYMBOL(drm_sched_fini);
Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Christian König
1032
33.17%
36
40.00%
Chunming Zhou
584
18.77%
22
24.44%
Monk Liu
496
15.94%
11
12.22%
Jammy Zhou
479
15.40%
4
4.44%
Lucas Stach
219
7.04%
1
1.11%
Andres Rodriguez
114
3.66%
2
2.22%
Andrey Grodzovsky
67
2.15%
3
3.33%
Nicolai Hähnle
59
1.90%
4
4.44%
Chris Wilson
32
1.03%
1
1.11%
Junwei (Martin) Zhang
18
0.58%
2
2.22%
Dave Airlie
6
0.19%
1
1.11%
Ingo Molnar
3
0.10%
1
1.11%
Nils Wallménius
1
0.03%
1
1.11%
Mark Rutland
1
0.03%
1
1.11%
Total
3111
100.00%
90
100.00%
Directory: drivers/gpu/drm/scheduler

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