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-rw-r--r--drivers/gpu/drm/scheduler/gpu_scheduler_trace.h2
-rw-r--r--drivers/gpu/drm/scheduler/sched_entity.c9
-rw-r--r--drivers/gpu/drm/scheduler/sched_main.c494
3 files changed, 352 insertions, 153 deletions
diff --git a/drivers/gpu/drm/scheduler/gpu_scheduler_trace.h b/drivers/gpu/drm/scheduler/gpu_scheduler_trace.h
index 3143ecaaff..f8ed093b73 100644
--- a/drivers/gpu/drm/scheduler/gpu_scheduler_trace.h
+++ b/drivers/gpu/drm/scheduler/gpu_scheduler_trace.h
@@ -51,7 +51,7 @@ DECLARE_EVENT_CLASS(drm_sched_job,
__assign_str(name, sched_job->sched->name);
__entry->job_count = spsc_queue_count(&entity->job_queue);
__entry->hw_job_count = atomic_read(
- &sched_job->sched->hw_rq_count);
+ &sched_job->sched->credit_count);
),
TP_printk("entity=%p, id=%llu, fence=%p, ring=%s, job count:%u, hw job count:%d",
__entry->entity, __entry->id,
diff --git a/drivers/gpu/drm/scheduler/sched_entity.c b/drivers/gpu/drm/scheduler/sched_entity.c
index 9ee9289821..58c8161289 100644
--- a/drivers/gpu/drm/scheduler/sched_entity.c
+++ b/drivers/gpu/drm/scheduler/sched_entity.c
@@ -88,13 +88,14 @@ int drm_sched_entity_init(struct drm_sched_entity *entity,
pr_warn("%s: called with uninitialized scheduler\n", __func__);
} else if (num_sched_list) {
/* The "priority" of an entity cannot exceed the number of run-queues of a
- * scheduler. Protect against num_rqs being 0, by converting to signed.
+ * scheduler. Protect against num_rqs being 0, by converting to signed. Choose
+ * the lowest priority available.
*/
if (entity->priority >= sched_list[0]->num_rqs) {
drm_err(sched_list[0], "entity with out-of-bounds priority:%u num_rqs:%u\n",
entity->priority, sched_list[0]->num_rqs);
entity->priority = max_t(s32, (s32) sched_list[0]->num_rqs - 1,
- (s32) DRM_SCHED_PRIORITY_MIN);
+ (s32) DRM_SCHED_PRIORITY_KERNEL);
}
entity->rq = sched_list[0]->sched_rq[entity->priority];
}
@@ -379,7 +380,7 @@ static void drm_sched_entity_wakeup(struct dma_fence *f,
container_of(cb, struct drm_sched_entity, cb);
drm_sched_entity_clear_dep(f, cb);
- drm_sched_wakeup_if_can_queue(entity->rq->sched);
+ drm_sched_wakeup(entity->rq->sched, entity);
}
/**
@@ -611,7 +612,7 @@ void drm_sched_entity_push_job(struct drm_sched_job *sched_job)
if (drm_sched_policy == DRM_SCHED_POLICY_FIFO)
drm_sched_rq_update_fifo(entity, submit_ts);
- drm_sched_wakeup_if_can_queue(entity->rq->sched);
+ drm_sched_wakeup(entity->rq->sched, entity);
}
}
EXPORT_SYMBOL(drm_sched_entity_push_job);
diff --git a/drivers/gpu/drm/scheduler/sched_main.c b/drivers/gpu/drm/scheduler/sched_main.c
index 99797a8c83..d442b89327 100644
--- a/drivers/gpu/drm/scheduler/sched_main.c
+++ b/drivers/gpu/drm/scheduler/sched_main.c
@@ -48,7 +48,30 @@
* through the jobs entity pointer.
*/
-#include <linux/kthread.h>
+/**
+ * DOC: Flow Control
+ *
+ * The DRM GPU scheduler provides a flow control mechanism to regulate the rate
+ * in which the jobs fetched from scheduler entities are executed.
+ *
+ * In this context the &drm_gpu_scheduler keeps track of a driver specified
+ * credit limit representing the capacity of this scheduler and a credit count;
+ * every &drm_sched_job carries a driver specified number of credits.
+ *
+ * Once a job is executed (but not yet finished), the job's credits contribute
+ * to the scheduler's credit count until the job is finished. If by executing
+ * one more job the scheduler's credit count would exceed the scheduler's
+ * credit limit, the job won't be executed. Instead, the scheduler will wait
+ * until the credit count has decreased enough to not overflow its credit limit.
+ * This implies waiting for previously executed jobs.
+ *
+ * Optionally, drivers may register a callback (update_job_credits) provided by
+ * struct drm_sched_backend_ops to update the job's credits dynamically. The
+ * scheduler executes this callback every time the scheduler considers a job for
+ * execution and subsequently checks whether the job fits the scheduler's credit
+ * limit.
+ */
+
#include <linux/wait.h>
#include <linux/sched.h>
#include <linux/completion.h>
@@ -76,6 +99,51 @@ int drm_sched_policy = DRM_SCHED_POLICY_FIFO;
MODULE_PARM_DESC(sched_policy, "Specify the scheduling policy for entities on a run-queue, " __stringify(DRM_SCHED_POLICY_RR) " = Round Robin, " __stringify(DRM_SCHED_POLICY_FIFO) " = FIFO (default).");
module_param_named(sched_policy, drm_sched_policy, int, 0444);
+static u32 drm_sched_available_credits(struct drm_gpu_scheduler *sched)
+{
+ u32 credits;
+
+ drm_WARN_ON(sched, check_sub_overflow(sched->credit_limit,
+ atomic_read(&sched->credit_count),
+ &credits));
+
+ return credits;
+}
+
+/**
+ * drm_sched_can_queue -- Can we queue more to the hardware?
+ * @sched: scheduler instance
+ * @entity: the scheduler entity
+ *
+ * Return true if we can push at least one more job from @entity, false
+ * otherwise.
+ */
+static bool drm_sched_can_queue(struct drm_gpu_scheduler *sched,
+ struct drm_sched_entity *entity)
+{
+ struct drm_sched_job *s_job;
+
+ s_job = to_drm_sched_job(spsc_queue_peek(&entity->job_queue));
+ if (!s_job)
+ return false;
+
+ if (sched->ops->update_job_credits) {
+ s_job->credits = sched->ops->update_job_credits(s_job);
+
+ drm_WARN(sched, !s_job->credits,
+ "Jobs with zero credits bypass job-flow control.\n");
+ }
+
+ /* If a job exceeds the credit limit, truncate it to the credit limit
+ * itself to guarantee forward progress.
+ */
+ if (drm_WARN(sched, s_job->credits > sched->credit_limit,
+ "Jobs may not exceed the credit limit, truncate.\n"))
+ s_job->credits = sched->credit_limit;
+
+ return drm_sched_available_credits(sched) >= s_job->credits;
+}
+
static __always_inline bool drm_sched_entity_compare_before(struct rb_node *a,
const struct rb_node *b)
{
@@ -187,12 +255,18 @@ 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
*
+ * @sched: the gpu scheduler
* @rq: scheduler run queue to check.
*
- * Try to find a ready entity, returns NULL if none found.
+ * Try to find the next ready entity.
+ *
+ * Return an entity if one is found; return an error-pointer (!NULL) if an
+ * entity was ready, but the scheduler had insufficient credits to accommodate
+ * its job; return NULL, if no ready entity was 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_gpu_scheduler *sched,
+ struct drm_sched_rq *rq)
{
struct drm_sched_entity *entity;
@@ -202,6 +276,14 @@ 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)) {
+ /* If we can't queue yet, preserve the current
+ * entity in terms of fairness.
+ */
+ if (!drm_sched_can_queue(sched, entity)) {
+ spin_unlock(&rq->lock);
+ return ERR_PTR(-ENOSPC);
+ }
+
rq->current_entity = entity;
reinit_completion(&entity->entity_idle);
spin_unlock(&rq->lock);
@@ -211,8 +293,15 @@ 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)) {
+ /* If we can't queue yet, preserve the current entity in
+ * terms of fairness.
+ */
+ if (!drm_sched_can_queue(sched, entity)) {
+ spin_unlock(&rq->lock);
+ return ERR_PTR(-ENOSPC);
+ }
+
rq->current_entity = entity;
reinit_completion(&entity->entity_idle);
spin_unlock(&rq->lock);
@@ -231,12 +320,18 @@ 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
*
+ * @sched: the gpu scheduler
* @rq: scheduler run queue to check.
*
- * Find oldest waiting ready entity, returns NULL if none found.
+ * Find oldest waiting ready entity.
+ *
+ * Return an entity if one is found; return an error-pointer (!NULL) if an
+ * entity was ready, but the scheduler had insufficient credits to accommodate
+ * its job; return NULL, if no ready entity was 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_gpu_scheduler *sched,
+ struct drm_sched_rq *rq)
{
struct rb_node *rb;
@@ -246,6 +341,14 @@ 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)) {
+ /* If we can't queue yet, preserve the current entity in
+ * terms of fairness.
+ */
+ if (!drm_sched_can_queue(sched, entity)) {
+ spin_unlock(&rq->lock);
+ return ERR_PTR(-ENOSPC);
+ }
+
rq->current_entity = entity;
reinit_completion(&entity->entity_idle);
break;
@@ -257,6 +360,42 @@ drm_sched_rq_select_entity_fifo(struct drm_sched_rq *rq)
}
/**
+ * drm_sched_run_job_queue - enqueue run-job work
+ * @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_run_free_queue - enqueue free-job work
+ * @sched: scheduler instance
+ */
+static void __drm_sched_run_free_queue(struct drm_gpu_scheduler *sched)
+{
+ if (!READ_ONCE(sched->pause_submit))
+ queue_work(sched->submit_wq, &sched->work_free_job);
+}
+
+/**
+ * drm_sched_run_free_queue - enqueue free-job work if ready
+ * @sched: scheduler instance
+ */
+static void drm_sched_run_free_queue(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_run_free_queue(sched);
+ spin_unlock(&sched->job_list_lock);
+}
+
+/**
* drm_sched_job_done - complete a job
* @s_job: pointer to the job which is done
*
@@ -267,7 +406,7 @@ static void drm_sched_job_done(struct drm_sched_job *s_job, int result)
struct drm_sched_fence *s_fence = s_job->s_fence;
struct drm_gpu_scheduler *sched = s_fence->sched;
- atomic_dec(&sched->hw_rq_count);
+ atomic_sub(s_job->credits, &sched->credit_count);
atomic_dec(sched->score);
trace_drm_sched_process_job(s_fence);
@@ -275,7 +414,7 @@ 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);
- wake_up_interruptible(&sched->wake_up_worker);
+ __drm_sched_run_free_queue(sched);
}
/**
@@ -299,10 +438,35 @@ static void drm_sched_job_done_cb(struct dma_fence *f, struct dma_fence_cb *cb)
*/
static void drm_sched_start_timeout(struct drm_gpu_scheduler *sched)
{
+ lockdep_assert_held(&sched->job_list_lock);
+
if (sched->timeout != MAX_SCHEDULE_TIMEOUT &&
!list_empty(&sched->pending_list))
- queue_delayed_work(sched->timeout_wq, &sched->work_tdr, sched->timeout);
+ mod_delayed_work(sched->timeout_wq, &sched->work_tdr, sched->timeout);
+}
+
+static void drm_sched_start_timeout_unlocked(struct drm_gpu_scheduler *sched)
+{
+ spin_lock(&sched->job_list_lock);
+ drm_sched_start_timeout(sched);
+ spin_unlock(&sched->job_list_lock);
+}
+
+/**
+ * drm_sched_tdr_queue_imm: - immediately start job timeout handler
+ *
+ * @sched: scheduler for which the timeout handling should be started.
+ *
+ * Start timeout handling immediately for the named scheduler.
+ */
+void drm_sched_tdr_queue_imm(struct drm_gpu_scheduler *sched)
+{
+ spin_lock(&sched->job_list_lock);
+ sched->timeout = 0;
+ drm_sched_start_timeout(sched);
+ spin_unlock(&sched->job_list_lock);
}
+EXPORT_SYMBOL(drm_sched_tdr_queue_imm);
/**
* drm_sched_fault - immediately start timeout handler
@@ -388,7 +552,7 @@ static void drm_sched_job_timedout(struct work_struct *work)
sched = container_of(work, struct drm_gpu_scheduler, work_tdr.work);
- /* Protects against concurrent deletion in drm_sched_get_cleanup_job */
+ /* Protects against concurrent deletion in drm_sched_get_finished_job */
spin_lock(&sched->job_list_lock);
job = list_first_entry_or_null(&sched->pending_list,
struct drm_sched_job, list);
@@ -416,11 +580,8 @@ static void drm_sched_job_timedout(struct work_struct *work)
spin_unlock(&sched->job_list_lock);
}
- if (status != DRM_GPU_SCHED_STAT_ENODEV) {
- spin_lock(&sched->job_list_lock);
- drm_sched_start_timeout(sched);
- spin_unlock(&sched->job_list_lock);
- }
+ if (status != DRM_GPU_SCHED_STAT_ENODEV)
+ drm_sched_start_timeout_unlocked(sched);
}
/**
@@ -439,13 +600,13 @@ void drm_sched_stop(struct drm_gpu_scheduler *sched, struct drm_sched_job *bad)
{
struct drm_sched_job *s_job, *tmp;
- kthread_park(sched->thread);
+ drm_sched_wqueue_stop(sched);
/*
* Reinsert back the bad job here - now it's safe as
- * drm_sched_get_cleanup_job cannot race against us and release the
+ * drm_sched_get_finished_job cannot race against us and release the
* bad job at this point - we parked (waited for) any in progress
- * (earlier) cleanups and drm_sched_get_cleanup_job will not be called
+ * (earlier) cleanups and drm_sched_get_finished_job will not be called
* now until the scheduler thread is unparked.
*/
if (bad && bad->sched == sched)
@@ -468,7 +629,7 @@ void drm_sched_stop(struct drm_gpu_scheduler *sched, struct drm_sched_job *bad)
&s_job->cb)) {
dma_fence_put(s_job->s_fence->parent);
s_job->s_fence->parent = NULL;
- atomic_dec(&sched->hw_rq_count);
+ atomic_sub(s_job->credits, &sched->credit_count);
} else {
/*
* remove job from pending_list.
@@ -529,7 +690,7 @@ void drm_sched_start(struct drm_gpu_scheduler *sched, bool full_recovery)
list_for_each_entry_safe(s_job, tmp, &sched->pending_list, list) {
struct dma_fence *fence = s_job->s_fence->parent;
- atomic_inc(&sched->hw_rq_count);
+ atomic_add(s_job->credits, &sched->credit_count);
if (!full_recovery)
continue;
@@ -546,13 +707,10 @@ void drm_sched_start(struct drm_gpu_scheduler *sched, bool full_recovery)
drm_sched_job_done(s_job, -ECANCELED);
}
- if (full_recovery) {
- spin_lock(&sched->job_list_lock);
- drm_sched_start_timeout(sched);
- spin_unlock(&sched->job_list_lock);
- }
+ if (full_recovery)
+ drm_sched_start_timeout_unlocked(sched);
- kthread_unpark(sched->thread);
+ drm_sched_wqueue_start(sched);
}
EXPORT_SYMBOL(drm_sched_start);
@@ -613,6 +771,8 @@ EXPORT_SYMBOL(drm_sched_resubmit_jobs);
* drm_sched_job_init - init a scheduler job
* @job: scheduler job to init
* @entity: scheduler entity to use
+ * @credits: the number of credits this job contributes to the schedulers
+ * credit limit
* @owner: job owner for debugging
*
* Refer to drm_sched_entity_push_job() documentation
@@ -630,7 +790,7 @@ EXPORT_SYMBOL(drm_sched_resubmit_jobs);
*/
int drm_sched_job_init(struct drm_sched_job *job,
struct drm_sched_entity *entity,
- void *owner)
+ u32 credits, void *owner)
{
if (!entity->rq) {
/* This will most likely be followed by missing frames
@@ -641,7 +801,13 @@ int drm_sched_job_init(struct drm_sched_job *job,
return -ENOENT;
}
+ if (unlikely(!credits)) {
+ pr_err("*ERROR* %s: credits cannot be 0!\n", __func__);
+ return -EINVAL;
+ }
+
job->entity = entity;
+ job->credits = credits;
job->s_fence = drm_sched_fence_alloc(entity, owner);
if (!job->s_fence)
return -ENOMEM;
@@ -854,27 +1020,17 @@ 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
+ * drm_sched_wakeup - Wake up the scheduler if it is ready to queue
* @sched: scheduler instance
+ * @entity: the scheduler entity
*
* Wake up the scheduler if we can queue jobs.
*/
-void drm_sched_wakeup_if_can_queue(struct drm_gpu_scheduler *sched)
+void drm_sched_wakeup(struct drm_gpu_scheduler *sched,
+ struct drm_sched_entity *entity)
{
- if (drm_sched_can_queue(sched))
- wake_up_interruptible(&sched->wake_up_worker);
+ if (drm_sched_can_queue(sched, entity))
+ drm_sched_run_job_queue(sched);
}
/**
@@ -882,7 +1038,11 @@ void drm_sched_wakeup_if_can_queue(struct drm_gpu_scheduler *sched)
*
* @sched: scheduler instance
*
- * Returns the entity to process or NULL if none are found.
+ * Return an entity to process or NULL if none are found.
+ *
+ * Note, that we break out of the for-loop when "entity" is non-null, which can
+ * also be an error-pointer--this assures we don't process lower priority
+ * run-queues. See comments in the respectively called functions.
*/
static struct drm_sched_entity *
drm_sched_select_entity(struct drm_gpu_scheduler *sched)
@@ -890,23 +1050,21 @@ drm_sched_select_entity(struct drm_gpu_scheduler *sched)
struct drm_sched_entity *entity;
int i;
- if (!drm_sched_can_queue(sched))
- return NULL;
-
- /* Kernel run queue has higher priority than normal run queue*/
- for (i = sched->num_rqs - 1; i >= DRM_SCHED_PRIORITY_MIN; i--) {
+ /* Start with the highest priority.
+ */
+ for (i = DRM_SCHED_PRIORITY_KERNEL; i < sched->num_rqs; i++) {
entity = drm_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->sched_rq[i]) :
+ drm_sched_rq_select_entity_rr(sched, sched->sched_rq[i]);
if (entity)
break;
}
- return entity;
+ return IS_ERR(entity) ? NULL : entity;
}
/**
- * drm_sched_get_cleanup_job - fetch the next finished job to be destroyed
+ * drm_sched_get_finished_job - fetch the next finished job to be destroyed
*
* @sched: scheduler instance
*
@@ -914,7 +1072,7 @@ drm_sched_select_entity(struct drm_gpu_scheduler *sched)
* ready for it to be destroyed.
*/
static struct drm_sched_job *
-drm_sched_get_cleanup_job(struct drm_gpu_scheduler *sched)
+drm_sched_get_finished_job(struct drm_gpu_scheduler *sched)
{
struct drm_sched_job *job, *next;
@@ -934,8 +1092,10 @@ drm_sched_get_cleanup_job(struct drm_gpu_scheduler *sched)
typeof(*next), list);
if (next) {
- next->s_fence->scheduled.timestamp =
- dma_fence_timestamp(&job->s_fence->finished);
+ if (test_bit(DMA_FENCE_FLAG_TIMESTAMP_BIT,
+ &next->s_fence->scheduled.flags))
+ next->s_fence->scheduled.timestamp =
+ dma_fence_timestamp(&job->s_fence->finished);
/* start TO timer for next job */
drm_sched_start_timeout(sched);
}
@@ -985,91 +1145,84 @@ drm_sched_pick_best(struct drm_gpu_scheduler **sched_list,
EXPORT_SYMBOL(drm_sched_pick_best);
/**
- * drm_sched_blocked - check if the scheduler is blocked
- *
- * @sched: scheduler instance
+ * drm_sched_free_job_work - worker to call free_job
*
- * Returns true if blocked, otherwise false.
+ * @w: free job work
*/
-static bool drm_sched_blocked(struct drm_gpu_scheduler *sched)
+static void drm_sched_free_job_work(struct work_struct *w)
{
- if (kthread_should_park()) {
- kthread_parkme();
- return true;
- }
+ struct drm_gpu_scheduler *sched =
+ container_of(w, struct drm_gpu_scheduler, work_free_job);
+ struct drm_sched_job *job;
+
+ if (READ_ONCE(sched->pause_submit))
+ return;
- return false;
+ job = drm_sched_get_finished_job(sched);
+ if (job)
+ sched->ops->free_job(job);
+
+ drm_sched_run_free_queue(sched);
+ drm_sched_run_job_queue(sched);
}
/**
- * drm_sched_main - main scheduler thread
- *
- * @param: scheduler instance
+ * drm_sched_run_job_work - worker to call run_job
*
- * Returns 0.
+ * @w: run job work
*/
-static int drm_sched_main(void *param)
+static void drm_sched_run_job_work(struct work_struct *w)
{
- struct drm_gpu_scheduler *sched = (struct drm_gpu_scheduler *)param;
+ 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;
- sched_set_fifo_low(current);
-
- 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;
- struct drm_sched_job *cleanup_job = NULL;
-
- wait_event_interruptible(sched->wake_up_worker,
- (cleanup_job = drm_sched_get_cleanup_job(sched)) ||
- (!drm_sched_blocked(sched) &&
- (entity = drm_sched_select_entity(sched))) ||
- kthread_should_stop());
-
- if (cleanup_job)
- sched->ops->free_job(cleanup_job);
-
- if (!entity)
- continue;
-
- sched_job = drm_sched_entity_pop_job(entity);
+ if (READ_ONCE(sched->pause_submit))
+ return;
- if (!sched_job) {
- complete_all(&entity->entity_idle);
- continue;
- }
+ /* Find entity with a ready job */
+ entity = drm_sched_select_entity(sched);
+ if (!entity)
+ return; /* No more work */
- s_fence = sched_job->s_fence;
+ sched_job = drm_sched_entity_pop_job(entity);
+ if (!sched_job) {
+ complete_all(&entity->entity_idle);
+ drm_sched_run_job_queue(sched);
+ return;
+ }
- atomic_inc(&sched->hw_rq_count);
- drm_sched_job_begin(sched_job);
+ s_fence = sched_job->s_fence;
- 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);
+ atomic_add(sched_job->credits, &sched->credit_count);
+ drm_sched_job_begin(sched_job);
- if (!IS_ERR_OR_NULL(fence)) {
- /* Drop for original kref_init of the fence */
- dma_fence_put(fence);
+ 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);
- 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);
- }
+ if (!IS_ERR_OR_NULL(fence)) {
+ /* Drop for original kref_init of the fence */
+ dma_fence_put(fence);
- wake_up(&sched->job_scheduled);
+ 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);
}
- return 0;
+
+ wake_up(&sched->job_scheduled);
+ drm_sched_run_job_queue(sched);
}
/**
@@ -1077,8 +1230,10 @@ static int drm_sched_main(void *param)
*
* @sched: scheduler instance
* @ops: backend operations for this scheduler
+ * @submit_wq: workqueue to use for submission. If NULL, an ordered wq is
+ * allocated and used
* @num_rqs: number of runqueues, one for each priority, up to DRM_SCHED_PRIORITY_COUNT
- * @hw_submission: number of hw submissions that can be in flight
+ * @credit_limit: the number of credits this scheduler can hold from all jobs
* @hang_limit: number of times to allow a job to hang before dropping it
* @timeout: timeout value in jiffies for the scheduler
* @timeout_wq: workqueue to use for timeout work. If NULL, the system_wq is
@@ -1091,14 +1246,15 @@ static int drm_sched_main(void *param)
*/
int drm_sched_init(struct drm_gpu_scheduler *sched,
const struct drm_sched_backend_ops *ops,
- u32 num_rqs, uint32_t hw_submission, unsigned int hang_limit,
+ struct workqueue_struct *submit_wq,
+ u32 num_rqs, u32 credit_limit, unsigned int hang_limit,
long timeout, struct workqueue_struct *timeout_wq,
atomic_t *score, const char *name, struct device *dev)
{
int i, ret;
sched->ops = ops;
- sched->hw_submission_limit = hw_submission;
+ sched->credit_limit = credit_limit;
sched->name = name;
sched->timeout = timeout;
sched->timeout_wq = timeout_wq ? : system_wq;
@@ -1121,46 +1277,50 @@ int drm_sched_init(struct drm_gpu_scheduler *sched,
return 0;
}
+ if (submit_wq) {
+ sched->submit_wq = submit_wq;
+ sched->own_submit_wq = false;
+ } else {
+ sched->submit_wq = alloc_ordered_workqueue(name, 0);
+ if (!sched->submit_wq)
+ return -ENOMEM;
+
+ sched->own_submit_wq = true;
+ }
+ ret = -ENOMEM;
sched->sched_rq = kmalloc_array(num_rqs, sizeof(*sched->sched_rq),
GFP_KERNEL | __GFP_ZERO);
- if (!sched->sched_rq) {
- drm_err(sched, "%s: out of memory for sched_rq\n", __func__);
- return -ENOMEM;
- }
+ if (!sched->sched_rq)
+ goto Out_free;
sched->num_rqs = num_rqs;
- ret = -ENOMEM;
- for (i = DRM_SCHED_PRIORITY_MIN; i < sched->num_rqs; i++) {
+ for (i = DRM_SCHED_PRIORITY_KERNEL; i < sched->num_rqs; i++) {
sched->sched_rq[i] = kzalloc(sizeof(*sched->sched_rq[i]), GFP_KERNEL);
if (!sched->sched_rq[i])
goto Out_unroll;
drm_sched_rq_init(sched, sched->sched_rq[i]);
}
- init_waitqueue_head(&sched->wake_up_worker);
init_waitqueue_head(&sched->job_scheduled);
INIT_LIST_HEAD(&sched->pending_list);
spin_lock_init(&sched->job_list_lock);
- atomic_set(&sched->hw_rq_count, 0);
+ atomic_set(&sched->credit_count, 0);
INIT_DELAYED_WORK(&sched->work_tdr, drm_sched_job_timedout);
+ 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);
-
- /* Each scheduler will run on a seperate kernel thread */
- sched->thread = kthread_run(drm_sched_main, sched, sched->name);
- if (IS_ERR(sched->thread)) {
- ret = PTR_ERR(sched->thread);
- sched->thread = NULL;
- DRM_DEV_ERROR(sched->dev, "Failed to create scheduler for %s.\n", name);
- goto Out_unroll;
- }
+ sched->pause_submit = false;
sched->ready = true;
return 0;
Out_unroll:
- for (--i ; i >= DRM_SCHED_PRIORITY_MIN; i--)
+ for (--i ; i >= DRM_SCHED_PRIORITY_KERNEL; i--)
kfree(sched->sched_rq[i]);
+Out_free:
kfree(sched->sched_rq);
sched->sched_rq = NULL;
+ if (sched->own_submit_wq)
+ destroy_workqueue(sched->submit_wq);
drm_err(sched, "%s: Failed to setup GPU scheduler--out of memory\n", __func__);
return ret;
}
@@ -1178,10 +1338,9 @@ void drm_sched_fini(struct drm_gpu_scheduler *sched)
struct drm_sched_entity *s_entity;
int i;
- if (sched->thread)
- kthread_stop(sched->thread);
+ drm_sched_wqueue_stop(sched);
- for (i = sched->num_rqs - 1; i >= DRM_SCHED_PRIORITY_MIN; i--) {
+ for (i = DRM_SCHED_PRIORITY_KERNEL; i < sched->num_rqs; i++) {
struct drm_sched_rq *rq = sched->sched_rq[i];
spin_lock(&rq->lock);
@@ -1202,6 +1361,8 @@ void drm_sched_fini(struct drm_gpu_scheduler *sched)
/* Confirm no work left behind accessing device structures */
cancel_delayed_work_sync(&sched->work_tdr);
+ if (sched->own_submit_wq)
+ destroy_workqueue(sched->submit_wq);
sched->ready = false;
kfree(sched->sched_rq);
sched->sched_rq = NULL;
@@ -1231,9 +1392,7 @@ void drm_sched_increase_karma(struct drm_sched_job *bad)
if (bad->s_priority != DRM_SCHED_PRIORITY_KERNEL) {
atomic_inc(&bad->karma);
- for (i = DRM_SCHED_PRIORITY_MIN;
- i < min_t(typeof(sched->num_rqs), sched->num_rqs, DRM_SCHED_PRIORITY_KERNEL);
- i++) {
+ for (i = DRM_SCHED_PRIORITY_HIGH; i < sched->num_rqs; i++) {
struct drm_sched_rq *rq = sched->sched_rq[i];
spin_lock(&rq->lock);
@@ -1252,3 +1411,42 @@ void drm_sched_increase_karma(struct drm_sched_job *bad)
}
}
EXPORT_SYMBOL(drm_sched_increase_karma);
+
+/**
+ * drm_sched_wqueue_ready - Is the scheduler ready for submission
+ *
+ * @sched: scheduler instance
+ *
+ * Returns true if submission is ready
+ */
+bool drm_sched_wqueue_ready(struct drm_gpu_scheduler *sched)
+{
+ return sched->ready;
+}
+EXPORT_SYMBOL(drm_sched_wqueue_ready);
+
+/**
+ * drm_sched_wqueue_stop - stop scheduler submission
+ *
+ * @sched: scheduler instance
+ */
+void drm_sched_wqueue_stop(struct drm_gpu_scheduler *sched)
+{
+ WRITE_ONCE(sched->pause_submit, true);
+ cancel_work_sync(&sched->work_run_job);
+ cancel_work_sync(&sched->work_free_job);
+}
+EXPORT_SYMBOL(drm_sched_wqueue_stop);
+
+/**
+ * drm_sched_wqueue_start - start scheduler submission
+ *
+ * @sched: scheduler instance
+ */
+void drm_sched_wqueue_start(struct drm_gpu_scheduler *sched)
+{
+ WRITE_ONCE(sched->pause_submit, false);
+ queue_work(sched->submit_wq, &sched->work_run_job);
+ queue_work(sched->submit_wq, &sched->work_free_job);
+}
+EXPORT_SYMBOL(drm_sched_wqueue_start);