drm: move amd_gpu_scheduler into common location
This moves and renames the AMDGPU scheduler to a common location in DRM
in order to facilitate re-use by other drivers. This is mostly a straight
forward rename with no code changes.
One notable exception is the function to_drm_sched_fence(), which is no
longer a inline header function to avoid the need to export the
drm_sched_fence_ops_scheduled and drm_sched_fence_ops_finished structures.
Reviewed-by: Chunming Zhou <david1.zhou@amd.com>
Tested-by: Dieter Nützel <Dieter@nuetzel-hh.de>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
diff --git a/drivers/gpu/drm/scheduler/gpu_scheduler.c b/drivers/gpu/drm/scheduler/gpu_scheduler.c
new file mode 100644
index 0000000..2c18996
--- /dev/null
+++ b/drivers/gpu/drm/scheduler/gpu_scheduler.c
@@ -0,0 +1,744 @@
+/*
+ * 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;
+}
+
+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);
+}
+
+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);
+}
+
+/**
+ * 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;
+}
+
+/**
+ * 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;
+}
+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;
+}
+
+/**
+ * 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;
+}
+
+/**
+ * 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;
+}
+
+/**
+ * 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);
+ }
+ }
+}
+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);
+}
+
+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);
+}
+
+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);
+}
+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;
+}
+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;
+}
+
+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;
+}
+
+/**
+ * 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);
+ }
+}
+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);
+}
+
+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);
+}
+
+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);
+}
+
+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);
+}
+
+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;
+ }
+ }
+}
+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);
+}
+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;
+}
+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;
+}
+
+/**
+ * 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);
+}
+
+/**
+ * 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;
+}
+
+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);
+}
+
+static bool drm_sched_blocked(struct drm_gpu_scheduler *sched)
+{
+ if (kthread_should_park()) {
+ kthread_parkme();
+ return true;
+ }
+
+ return false;
+}
+
+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;
+}
+
+/**
+ * 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;
+}
+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);
+}
+EXPORT_SYMBOL(drm_sched_fini);