drm/i915: Extract request submission from execlists

In the process of preparing to reuse the request submission logic for
other backends, lift it out of the execlists backend. It already
operates on the common structs, so just a matter of moving and renaming.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210203165259.13087-6-chris@chris-wilson.co.uk

4 files changed, 86 insertions, 83 deletions

diff --git a/drivers/gpu/drm/i915/gt/intel_execlists_submission.c b/drivers/gpu/drm/i915/gt/intel_execlists_submission.c
index f95a35383f48..7b426e461ce3 100644
--- a/drivers/gpu/drm/i915/gt/intel_execlists_submission.c
+++ b/drivers/gpu/drm/i915/gt/intel_execlists_submission.c
@@ -2453,59 +2453,6 @@ static void execlists_preempt(struct timer_list *timer)
 	execlists_kick(timer, preempt);
 }
 
-static void queue_request(struct intel_engine_cs *engine,
-			  struct i915_request *rq)
-{
-	GEM_BUG_ON(!list_empty(&rq->sched.link));
-	list_add_tail(&rq->sched.link,
-		      i915_sched_lookup_priolist(engine, rq_prio(rq)));
-	set_bit(I915_FENCE_FLAG_PQUEUE, &rq->fence.flags);
-}
-
-static bool submit_queue(struct intel_engine_cs *engine,
-			 const struct i915_request *rq)
-{
-	struct intel_engine_execlists *execlists = &engine->execlists;
-
-	if (rq_prio(rq) <= execlists->queue_priority_hint)
-		return false;
-
-	execlists->queue_priority_hint = rq_prio(rq);
-	return true;
-}
-
-static bool ancestor_on_hold(const struct intel_engine_cs *engine,
-			     const struct i915_request *rq)
-{
-	GEM_BUG_ON(i915_request_on_hold(rq));
-	return !list_empty(&engine->active.hold) && hold_request(rq);
-}
-
-static void execlists_submit_request(struct i915_request *request)
-{
-	struct intel_engine_cs *engine = request->engine;
-	unsigned long flags;
-
-	/* Will be called from irq-context when using foreign fences. */
-	spin_lock_irqsave(&engine->active.lock, flags);
-
-	if (unlikely(ancestor_on_hold(engine, request))) {
-		RQ_TRACE(request, "ancestor on hold\n");
-		list_add_tail(&request->sched.link, &engine->active.hold);
-		i915_request_set_hold(request);
-	} else {
-		queue_request(engine, request);
-
-		GEM_BUG_ON(RB_EMPTY_ROOT(&engine->execlists.queue.rb_root));
-		GEM_BUG_ON(list_empty(&request->sched.link));
-
-		if (submit_queue(engine, request))
-			__execlists_kick(&engine->execlists);
-	}
-
-	spin_unlock_irqrestore(&engine->active.lock, flags);
-}
-
 static int execlists_context_pre_pin(struct intel_context *ce,
 				     struct i915_gem_ww_ctx *ww,
 				     void **vaddr)
@@ -3105,7 +3052,7 @@ static bool can_preempt(struct intel_engine_cs *engine)
 
 static void execlists_set_default_submission(struct intel_engine_cs *engine)
 {
-	engine->submit_request = execlists_submit_request;
+	engine->submit_request = i915_request_enqueue;
 	engine->execlists.tasklet.callback = execlists_submission_tasklet;
 }
 
diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
index 2f5c39091d49..aa34a2f3d6d5 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
+++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
@@ -520,34 +520,6 @@ static int guc_request_alloc(struct i915_request *request)
 	return 0;
 }
 
-static inline void queue_request(struct intel_engine_cs *engine,
-				 struct i915_request *rq,
-				 int prio)
-{
-	GEM_BUG_ON(!list_empty(&rq->sched.link));
-	list_add_tail(&rq->sched.link,
-		      i915_sched_lookup_priolist(engine, prio));
-	set_bit(I915_FENCE_FLAG_PQUEUE, &rq->fence.flags);
-}
-
-static void guc_submit_request(struct i915_request *rq)
-{
-	struct intel_engine_cs *engine = rq->engine;
-	unsigned long flags;
-
-	/* Will be called from irq-context when using foreign fences. */
-	spin_lock_irqsave(&engine->active.lock, flags);
-
-	queue_request(engine, rq, rq_prio(rq));
-
-	GEM_BUG_ON(RB_EMPTY_ROOT(&engine->execlists.queue.rb_root));
-	GEM_BUG_ON(list_empty(&rq->sched.link));
-
-	tasklet_hi_schedule(&engine->execlists.tasklet);
-
-	spin_unlock_irqrestore(&engine->active.lock, flags);
-}
-
 static void sanitize_hwsp(struct intel_engine_cs *engine)
 {
 	struct intel_timeline *tl;
@@ -616,7 +588,7 @@ static int guc_resume(struct intel_engine_cs *engine)
 
 static void guc_set_default_submission(struct intel_engine_cs *engine)
 {
-	engine->submit_request = guc_submit_request;
+	engine->submit_request = i915_request_enqueue;
 }
 
 static void guc_release(struct intel_engine_cs *engine)
diff --git a/drivers/gpu/drm/i915/i915_scheduler.c b/drivers/gpu/drm/i915/i915_scheduler.c
index 9e88417bf451..a56252d3546a 100644
--- a/drivers/gpu/drm/i915/i915_scheduler.c
+++ b/drivers/gpu/drm/i915/i915_scheduler.c
@@ -460,6 +460,88 @@ unlock:
 	spin_unlock_irqrestore(&engine->active.lock, flags);
 }
 
+static void queue_request(struct intel_engine_cs *engine,
+			  struct i915_request *rq)
+{
+	GEM_BUG_ON(!list_empty(&rq->sched.link));
+	list_add_tail(&rq->sched.link,
+		      i915_sched_lookup_priolist(engine, rq_prio(rq)));
+	set_bit(I915_FENCE_FLAG_PQUEUE, &rq->fence.flags);
+}
+
+static bool submit_queue(struct intel_engine_cs *engine,
+			 const struct i915_request *rq)
+{
+	struct intel_engine_execlists *execlists = &engine->execlists;
+
+	if (rq_prio(rq) <= execlists->queue_priority_hint)
+		return false;
+
+	execlists->queue_priority_hint = rq_prio(rq);
+	return true;
+}
+
+static bool hold_request(const struct i915_request *rq)
+{
+	struct i915_dependency *p;
+	bool result = false;
+
+	/*
+	 * If one of our ancestors is on hold, we must also be put on hold,
+	 * otherwise we will bypass it and execute before it.
+	 */
+	rcu_read_lock();
+	for_each_signaler(p, rq) {
+		const struct i915_request *s =
+			container_of(p->signaler, typeof(*s), sched);
+
+		if (s->engine != rq->engine)
+			continue;
+
+		result = i915_request_on_hold(s);
+		if (result)
+			break;
+	}
+	rcu_read_unlock();
+
+	return result;
+}
+
+static bool ancestor_on_hold(const struct intel_engine_cs *engine,
+			     const struct i915_request *rq)
+{
+	GEM_BUG_ON(i915_request_on_hold(rq));
+	return unlikely(!list_empty(&engine->active.hold)) && hold_request(rq);
+}
+
+void i915_request_enqueue(struct i915_request *rq)
+{
+	struct intel_engine_cs *engine = rq->engine;
+	unsigned long flags;
+	bool kick = false;
+
+	/* Will be called from irq-context when using foreign fences. */
+	spin_lock_irqsave(&engine->active.lock, flags);
+	GEM_BUG_ON(test_bit(I915_FENCE_FLAG_PQUEUE, &rq->fence.flags));
+
+	if (unlikely(ancestor_on_hold(engine, rq))) {
+		RQ_TRACE(rq, "ancestor on hold\n");
+		list_add_tail(&rq->sched.link, &engine->active.hold);
+		i915_request_set_hold(rq);
+	} else {
+		queue_request(engine, rq);
+
+		GEM_BUG_ON(RB_EMPTY_ROOT(&engine->execlists.queue.rb_root));
+
+		kick = submit_queue(engine, rq);
+	}
+
+	GEM_BUG_ON(list_empty(&rq->sched.link));
+	spin_unlock_irqrestore(&engine->active.lock, flags);
+	if (kick)
+		tasklet_hi_schedule(&engine->execlists.tasklet);
+}
+
 void i915_sched_node_init(struct i915_sched_node *node)
 {
 	spin_lock_init(&node->lock);
diff --git a/drivers/gpu/drm/i915/i915_scheduler.h b/drivers/gpu/drm/i915/i915_scheduler.h
index 2870fa3e089e..89d998f226e0 100644
--- a/drivers/gpu/drm/i915/i915_scheduler.h
+++ b/drivers/gpu/drm/i915/i915_scheduler.h
@@ -40,6 +40,8 @@ void i915_sched_init_ipi(struct i915_sched_ipi *ipi);
 
 void i915_request_set_priority(struct i915_request *request, int prio);
 
+void i915_request_enqueue(struct i915_request *request);
+
 struct list_head *
 i915_sched_lookup_priolist(struct intel_engine_cs *engine, int prio);