[PATCH v4 05/10] drm/sched: Split free_job into own work item
Matthew Brost
matthew.brost at intel.com
Tue Sep 19 05:01:50 UTC 2023
Rather than call free_job and run_job in same work item have a dedicated
work item for each. This aligns with the design and intended use of work
queues.
v2:
- Test for DMA_FENCE_FLAG_TIMESTAMP_BIT before setting
timestamp in free_job() work item (Danilo)
v3:
- Drop forward dec of drm_sched_select_entity (Boris)
- Return in drm_sched_run_job_work if entity NULL (Boris)
Signed-off-by: Matthew Brost <matthew.brost at intel.com>
---
drivers/gpu/drm/scheduler/sched_main.c | 290 +++++++++++++++----------
include/drm/gpu_scheduler.h | 8 +-
2 files changed, 182 insertions(+), 116 deletions(-)
diff --git a/drivers/gpu/drm/scheduler/sched_main.c b/drivers/gpu/drm/scheduler/sched_main.c
index 588c735f7498..1e21d234fb5c 100644
--- a/drivers/gpu/drm/scheduler/sched_main.c
+++ b/drivers/gpu/drm/scheduler/sched_main.c
@@ -213,11 +213,12 @@ void drm_sched_rq_remove_entity(struct drm_sched_rq *rq,
* drm_sched_rq_select_entity_rr - Select an entity which could provide a job to run
*
* @rq: scheduler run queue to check.
+ * @dequeue: dequeue selected entity
*
* Try to find a ready entity, returns NULL if none found.
*/
static struct drm_sched_entity *
-drm_sched_rq_select_entity_rr(struct drm_sched_rq *rq)
+drm_sched_rq_select_entity_rr(struct drm_sched_rq *rq, bool dequeue)
{
struct drm_sched_entity *entity;
@@ -227,8 +228,10 @@ drm_sched_rq_select_entity_rr(struct drm_sched_rq *rq)
if (entity) {
list_for_each_entry_continue(entity, &rq->entities, list) {
if (drm_sched_entity_is_ready(entity)) {
- rq->current_entity = entity;
- reinit_completion(&entity->entity_idle);
+ if (dequeue) {
+ rq->current_entity = entity;
+ reinit_completion(&entity->entity_idle);
+ }
spin_unlock(&rq->lock);
return entity;
}
@@ -238,8 +241,10 @@ drm_sched_rq_select_entity_rr(struct drm_sched_rq *rq)
list_for_each_entry(entity, &rq->entities, list) {
if (drm_sched_entity_is_ready(entity)) {
- rq->current_entity = entity;
- reinit_completion(&entity->entity_idle);
+ if (dequeue) {
+ rq->current_entity = entity;
+ reinit_completion(&entity->entity_idle);
+ }
spin_unlock(&rq->lock);
return entity;
}
@@ -257,11 +262,12 @@ drm_sched_rq_select_entity_rr(struct drm_sched_rq *rq)
* drm_sched_rq_select_entity_fifo - Select an entity which provides a job to run
*
* @rq: scheduler run queue to check.
+ * @dequeue: dequeue selected entity
*
* Find oldest waiting ready entity, returns NULL if none found.
*/
static struct drm_sched_entity *
-drm_sched_rq_select_entity_fifo(struct drm_sched_rq *rq)
+drm_sched_rq_select_entity_fifo(struct drm_sched_rq *rq, bool dequeue)
{
struct rb_node *rb;
@@ -271,8 +277,10 @@ drm_sched_rq_select_entity_fifo(struct drm_sched_rq *rq)
entity = rb_entry(rb, struct drm_sched_entity, rb_tree_node);
if (drm_sched_entity_is_ready(entity)) {
- rq->current_entity = entity;
- reinit_completion(&entity->entity_idle);
+ if (dequeue) {
+ rq->current_entity = entity;
+ reinit_completion(&entity->entity_idle);
+ }
break;
}
}
@@ -282,13 +290,102 @@ drm_sched_rq_select_entity_fifo(struct drm_sched_rq *rq)
}
/**
- * drm_sched_submit_queue - scheduler queue submission
+ * drm_sched_run_job_queue - queue job submission
+ * @sched: scheduler instance
+ */
+static void drm_sched_run_job_queue(struct drm_gpu_scheduler *sched)
+{
+ if (!READ_ONCE(sched->pause_submit))
+ queue_work(sched->submit_wq, &sched->work_run_job);
+}
+
+/**
+ * drm_sched_can_queue -- Can we queue more to the hardware?
+ * @sched: scheduler instance
+ *
+ * Return true if we can push more jobs to the hw, otherwise false.
+ */
+static bool drm_sched_can_queue(struct drm_gpu_scheduler *sched)
+{
+ return atomic_read(&sched->hw_rq_count) <
+ sched->hw_submission_limit;
+}
+
+/**
+ * drm_sched_select_entity - Select next entity to process
+ *
+ * @sched: scheduler instance
+ * @dequeue: dequeue selected entity
+ *
+ * Returns the entity to process or NULL if none are found.
+ */
+static struct drm_sched_entity *
+drm_sched_select_entity(struct drm_gpu_scheduler *sched, bool dequeue)
+{
+ struct drm_sched_entity *entity;
+ int i;
+
+ if (!drm_sched_can_queue(sched))
+ return NULL;
+
+ if (sched->single_entity) {
+ if (!READ_ONCE(sched->single_entity->stopped) &&
+ drm_sched_entity_is_ready(sched->single_entity))
+ return sched->single_entity;
+
+ return NULL;
+ }
+
+ /* Kernel run queue has higher priority than normal run queue*/
+ for (i = DRM_SCHED_PRIORITY_COUNT - 1; i >= DRM_SCHED_PRIORITY_MIN; i--) {
+ entity = sched->sched_policy == DRM_SCHED_POLICY_FIFO ?
+ drm_sched_rq_select_entity_fifo(&sched->sched_rq[i],
+ dequeue) :
+ drm_sched_rq_select_entity_rr(&sched->sched_rq[i],
+ dequeue);
+ if (entity)
+ break;
+ }
+
+ return entity;
+}
+
+/**
+ * drm_sched_run_job_queue_if_ready - queue job submission if ready
* @sched: scheduler instance
*/
-static void drm_sched_submit_queue(struct drm_gpu_scheduler *sched)
+static void drm_sched_run_job_queue_if_ready(struct drm_gpu_scheduler *sched)
+{
+ if (drm_sched_select_entity(sched, false))
+ drm_sched_run_job_queue(sched);
+}
+
+/**
+ * drm_sched_free_job_queue - queue free job
+ *
+ * @sched: scheduler instance to queue free job
+ */
+static void drm_sched_free_job_queue(struct drm_gpu_scheduler *sched)
{
if (!READ_ONCE(sched->pause_submit))
- queue_work(sched->submit_wq, &sched->work_submit);
+ queue_work(sched->submit_wq, &sched->work_free_job);
+}
+
+/**
+ * drm_sched_free_job_queue_if_ready - queue free job if ready
+ *
+ * @sched: scheduler instance to queue free job
+ */
+static void drm_sched_free_job_queue_if_ready(struct drm_gpu_scheduler *sched)
+{
+ struct drm_sched_job *job;
+
+ spin_lock(&sched->job_list_lock);
+ job = list_first_entry_or_null(&sched->pending_list,
+ struct drm_sched_job, list);
+ if (job && dma_fence_is_signaled(&job->s_fence->finished))
+ drm_sched_free_job_queue(sched);
+ spin_unlock(&sched->job_list_lock);
}
/**
@@ -310,7 +407,7 @@ static void drm_sched_job_done(struct drm_sched_job *s_job, int result)
dma_fence_get(&s_fence->finished);
drm_sched_fence_finished(s_fence, result);
dma_fence_put(&s_fence->finished);
- drm_sched_submit_queue(sched);
+ drm_sched_free_job_queue(sched);
}
/**
@@ -885,18 +982,6 @@ void drm_sched_job_cleanup(struct drm_sched_job *job)
}
EXPORT_SYMBOL(drm_sched_job_cleanup);
-/**
- * drm_sched_can_queue -- Can we queue more to the hardware?
- * @sched: scheduler instance
- *
- * Return true if we can push more jobs to the hw, otherwise false.
- */
-static bool drm_sched_can_queue(struct drm_gpu_scheduler *sched)
-{
- return atomic_read(&sched->hw_rq_count) <
- sched->hw_submission_limit;
-}
-
/**
* drm_sched_wakeup_if_can_queue - Wake up the scheduler
* @sched: scheduler instance
@@ -906,43 +991,7 @@ static bool drm_sched_can_queue(struct drm_gpu_scheduler *sched)
void drm_sched_wakeup_if_can_queue(struct drm_gpu_scheduler *sched)
{
if (drm_sched_can_queue(sched))
- drm_sched_submit_queue(sched);
-}
-
-/**
- * drm_sched_select_entity - Select next entity to process
- *
- * @sched: scheduler instance
- *
- * Returns the entity to process or NULL if none are found.
- */
-static struct drm_sched_entity *
-drm_sched_select_entity(struct drm_gpu_scheduler *sched)
-{
- struct drm_sched_entity *entity;
- int i;
-
- if (!drm_sched_can_queue(sched))
- return NULL;
-
- if (sched->single_entity) {
- if (!READ_ONCE(sched->single_entity->stopped) &&
- drm_sched_entity_is_ready(sched->single_entity))
- return sched->single_entity;
-
- return NULL;
- }
-
- /* Kernel run queue has higher priority than normal run queue*/
- for (i = DRM_SCHED_PRIORITY_COUNT - 1; i >= DRM_SCHED_PRIORITY_MIN; i--) {
- entity = sched->sched_policy == DRM_SCHED_POLICY_FIFO ?
- drm_sched_rq_select_entity_fifo(&sched->sched_rq[i]) :
- drm_sched_rq_select_entity_rr(&sched->sched_rq[i]);
- if (entity)
- break;
- }
-
- return entity;
+ drm_sched_run_job_queue(sched);
}
/**
@@ -974,8 +1023,10 @@ drm_sched_get_cleanup_job(struct drm_gpu_scheduler *sched)
typeof(*next), list);
if (next) {
- next->s_fence->scheduled.timestamp =
- job->s_fence->finished.timestamp;
+ if (test_bit(DMA_FENCE_FLAG_TIMESTAMP_BIT,
+ &next->s_fence->scheduled.flags))
+ next->s_fence->scheduled.timestamp =
+ job->s_fence->finished.timestamp;
/* start TO timer for next job */
drm_sched_start_timeout(sched);
}
@@ -1025,74 +1076,84 @@ drm_sched_pick_best(struct drm_gpu_scheduler **sched_list,
EXPORT_SYMBOL(drm_sched_pick_best);
/**
- * drm_sched_main - main scheduler thread
+ * drm_sched_free_job_work - worker to call free_job
*
- * @param: scheduler instance
+ * @w: free job work
*/
-static void drm_sched_main(struct work_struct *w)
+static void drm_sched_free_job_work(struct work_struct *w)
{
struct drm_gpu_scheduler *sched =
- container_of(w, struct drm_gpu_scheduler, work_submit);
- struct drm_sched_entity *entity;
+ container_of(w, struct drm_gpu_scheduler, work_free_job);
struct drm_sched_job *cleanup_job;
- int r;
if (READ_ONCE(sched->pause_submit))
return;
cleanup_job = drm_sched_get_cleanup_job(sched);
- entity = drm_sched_select_entity(sched);
-
- if (!entity && !cleanup_job)
- return; /* No more work */
-
- if (cleanup_job)
+ if (cleanup_job) {
sched->ops->free_job(cleanup_job);
- if (entity) {
- struct dma_fence *fence;
- struct drm_sched_fence *s_fence;
- struct drm_sched_job *sched_job;
-
- sched_job = drm_sched_entity_pop_job(entity);
- if (!sched_job) {
- complete_all(&entity->entity_idle);
- if (!cleanup_job)
- return; /* No more work */
- goto again;
- }
+ drm_sched_free_job_queue_if_ready(sched);
+ drm_sched_run_job_queue_if_ready(sched);
+ }
+}
+
+/**
+ * drm_sched_run_job_work - worker to call run_job
+ *
+ * @w: run job work
+ */
+static void drm_sched_run_job_work(struct work_struct *w)
+{
+ struct drm_gpu_scheduler *sched =
+ container_of(w, struct drm_gpu_scheduler, work_run_job);
+ struct drm_sched_entity *entity;
+ struct dma_fence *fence;
+ struct drm_sched_fence *s_fence;
+ struct drm_sched_job *sched_job;
+ int r;
- s_fence = sched_job->s_fence;
+ if (READ_ONCE(sched->pause_submit))
+ return;
- atomic_inc(&sched->hw_rq_count);
- drm_sched_job_begin(sched_job);
+ entity = drm_sched_select_entity(sched, true);
+ if (!entity)
+ return;
- trace_drm_run_job(sched_job, entity);
- fence = sched->ops->run_job(sched_job);
+ sched_job = drm_sched_entity_pop_job(entity);
+ if (!sched_job) {
complete_all(&entity->entity_idle);
- drm_sched_fence_scheduled(s_fence, fence);
+ return; /* No more work */
+ }
- if (!IS_ERR_OR_NULL(fence)) {
- /* Drop for original kref_init of the fence */
- dma_fence_put(fence);
+ s_fence = sched_job->s_fence;
- r = dma_fence_add_callback(fence, &sched_job->cb,
- drm_sched_job_done_cb);
- if (r == -ENOENT)
- drm_sched_job_done(sched_job, fence->error);
- else if (r)
- DRM_DEV_ERROR(sched->dev, "fence add callback failed (%d)\n",
- r);
- } else {
- drm_sched_job_done(sched_job, IS_ERR(fence) ?
- PTR_ERR(fence) : 0);
- }
+ atomic_inc(&sched->hw_rq_count);
+ drm_sched_job_begin(sched_job);
+
+ trace_drm_run_job(sched_job, entity);
+ fence = sched->ops->run_job(sched_job);
+ complete_all(&entity->entity_idle);
+ drm_sched_fence_scheduled(s_fence, fence);
- wake_up(&sched->job_scheduled);
+ if (!IS_ERR_OR_NULL(fence)) {
+ /* Drop for original kref_init of the fence */
+ dma_fence_put(fence);
+
+ r = dma_fence_add_callback(fence, &sched_job->cb,
+ drm_sched_job_done_cb);
+ if (r == -ENOENT)
+ drm_sched_job_done(sched_job, fence->error);
+ else if (r)
+ DRM_DEV_ERROR(sched->dev, "fence add callback failed (%d)\n",
+ r);
+ } else {
+ drm_sched_job_done(sched_job, IS_ERR(fence) ?
+ PTR_ERR(fence) : 0);
}
-again:
- drm_sched_submit_queue(sched);
+ wake_up(&sched->job_scheduled);
+ drm_sched_run_job_queue_if_ready(sched);
}
/**
@@ -1159,7 +1220,8 @@ int drm_sched_init(struct drm_gpu_scheduler *sched,
spin_lock_init(&sched->job_list_lock);
atomic_set(&sched->hw_rq_count, 0);
INIT_DELAYED_WORK(&sched->work_tdr, drm_sched_job_timedout);
- INIT_WORK(&sched->work_submit, drm_sched_main);
+ INIT_WORK(&sched->work_run_job, drm_sched_run_job_work);
+ INIT_WORK(&sched->work_free_job, drm_sched_free_job_work);
atomic_set(&sched->_score, 0);
atomic64_set(&sched->job_id_count, 0);
sched->pause_submit = false;
@@ -1286,7 +1348,8 @@ EXPORT_SYMBOL(drm_sched_submit_ready);
void drm_sched_submit_stop(struct drm_gpu_scheduler *sched)
{
WRITE_ONCE(sched->pause_submit, true);
- cancel_work_sync(&sched->work_submit);
+ cancel_work_sync(&sched->work_run_job);
+ cancel_work_sync(&sched->work_free_job);
}
EXPORT_SYMBOL(drm_sched_submit_stop);
@@ -1298,6 +1361,7 @@ EXPORT_SYMBOL(drm_sched_submit_stop);
void drm_sched_submit_start(struct drm_gpu_scheduler *sched)
{
WRITE_ONCE(sched->pause_submit, false);
- queue_work(sched->submit_wq, &sched->work_submit);
+ queue_work(sched->submit_wq, &sched->work_run_job);
+ queue_work(sched->submit_wq, &sched->work_free_job);
}
EXPORT_SYMBOL(drm_sched_submit_start);
diff --git a/include/drm/gpu_scheduler.h b/include/drm/gpu_scheduler.h
index 655675f797ea..7e6c121003ca 100644
--- a/include/drm/gpu_scheduler.h
+++ b/include/drm/gpu_scheduler.h
@@ -487,9 +487,10 @@ struct drm_sched_backend_ops {
* finished.
* @hw_rq_count: the number of jobs currently in the hardware queue.
* @job_id_count: used to assign unique id to the each job.
- * @submit_wq: workqueue used to queue @work_submit
+ * @submit_wq: workqueue used to queue @work_run_job and @work_free_job
* @timeout_wq: workqueue used to queue @work_tdr
- * @work_submit: schedules jobs and cleans up entities
+ * @work_run_job: schedules jobs
+ * @work_free_job: cleans up jobs
* @work_tdr: schedules a delayed call to @drm_sched_job_timedout after the
* timeout interval is over.
* @pending_list: the list of jobs which are currently in the job queue.
@@ -519,7 +520,8 @@ struct drm_gpu_scheduler {
atomic64_t job_id_count;
struct workqueue_struct *submit_wq;
struct workqueue_struct *timeout_wq;
- struct work_struct work_submit;
+ struct work_struct work_run_job;
+ struct work_struct work_free_job;
struct delayed_work work_tdr;
struct list_head pending_list;
spinlock_t job_list_lock;
--
2.34.1
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