[PATCH v3 05/13] drm/sched: Split free_job into own work item
Matthew Brost
matthew.brost at intel.com
Tue Sep 12 02:16:07 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)
Signed-off-by: Matthew Brost <matthew.brost at intel.com>
---
drivers/gpu/drm/scheduler/sched_main.c | 143 ++++++++++++++++++-------
include/drm/gpu_scheduler.h | 8 +-
2 files changed, 110 insertions(+), 41 deletions(-)
diff --git a/drivers/gpu/drm/scheduler/sched_main.c b/drivers/gpu/drm/scheduler/sched_main.c
index 3820e9ae12c8..d28b6751256e 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 +290,54 @@ 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_submit_queue(struct drm_gpu_scheduler *sched)
+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_submit);
+ queue_work(sched->submit_wq, &sched->work_run_job);
+}
+
+static struct drm_sched_entity *
+drm_sched_select_entity(struct drm_gpu_scheduler *sched, bool dequeue);
+
+/**
+ * drm_sched_run_job_queue_if_ready - queue job submission if ready
+ * @sched: scheduler instance
+ */
+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_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 +359,7 @@ 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);
}
/**
@@ -906,18 +955,19 @@ 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_run_job_queue(sched);
}
/**
* 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)
+drm_sched_select_entity(struct drm_gpu_scheduler *sched, bool dequeue)
{
struct drm_sched_entity *entity;
int i;
@@ -936,8 +986,10 @@ drm_sched_select_entity(struct drm_gpu_scheduler *sched)
/* 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]);
+ 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;
}
@@ -974,8 +1026,10 @@ 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);
}
@@ -1025,30 +1079,44 @@ 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 (cleanup_job) {
+ sched->ops->free_job(cleanup_job);
+
+ drm_sched_free_job_queue_if_ready(sched);
+ drm_sched_run_job_queue_if_ready(sched);
+ }
+}
- if (!entity && !cleanup_job)
- return; /* No more work */
+/**
+ * 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;
+ int r;
- if (cleanup_job)
- sched->ops->free_job(cleanup_job);
+ if (READ_ONCE(sched->pause_submit))
+ return;
+ entity = drm_sched_select_entity(sched, true);
if (entity) {
struct dma_fence *fence;
struct drm_sched_fence *s_fence;
@@ -1057,9 +1125,7 @@ static void drm_sched_main(struct work_struct *w)
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;
+ return; /* No more work */
}
s_fence = sched_job->s_fence;
@@ -1089,10 +1155,8 @@ static void drm_sched_main(struct work_struct *w)
}
wake_up(&sched->job_scheduled);
+ drm_sched_run_job_queue_if_ready(sched);
}
-
-again:
- drm_sched_submit_queue(sched);
}
/**
@@ -1151,7 +1215,8 @@ 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;
@@ -1276,7 +1341,8 @@ 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);
@@ -1288,6 +1354,7 @@ 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 04eec2d7635f..fbc083a92757 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.
@@ -518,7 +519,8 @@ 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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