Re: [PATCH 12/47] drm/i915/guc: Add bypass tasklet submission path to GuC

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On 6/24/2021 00:04, Matthew Brost wrote:
Add bypass tasklet submission path to GuC. The tasklet is only used if H2G
channel has backpresure.

Signed-off-by: Matthew Brost <matthew.brost@xxxxxxxxx>
Reviewed-by: John Harrison <John.C.Harrison@xxxxxxxxx>

---
  .../gpu/drm/i915/gt/uc/intel_guc_submission.c | 37 +++++++++++++++----
  1 file changed, 29 insertions(+), 8 deletions(-)

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 ee933efbf0ff..38aff83ee9fa 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
+++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
@@ -172,6 +172,12 @@ static int guc_add_request(struct intel_guc *guc, struct i915_request *rq)
  	return err;
  }
+static inline void guc_set_lrc_tail(struct i915_request *rq)
+{
+	rq->context->lrc_reg_state[CTX_RING_TAIL] =
+		intel_ring_set_tail(rq->ring, rq->tail);
+}
+
  static inline int rq_prio(const struct i915_request *rq)
  {
  	return rq->sched.attr.priority;
@@ -215,8 +221,7 @@ static int guc_dequeue_one_context(struct intel_guc *guc)
  	}
  done:
  	if (submit) {
-		last->context->lrc_reg_state[CTX_RING_TAIL] =
-			intel_ring_set_tail(last->ring, last->tail);
+		guc_set_lrc_tail(last);
  resubmit:
  		/*
  		 * We only check for -EBUSY here even though it is possible for
@@ -496,20 +501,36 @@ static inline void queue_request(struct i915_sched_engine *sched_engine,
  	set_bit(I915_FENCE_FLAG_PQUEUE, &rq->fence.flags);
  }
+static int guc_bypass_tasklet_submit(struct intel_guc *guc,
+				     struct i915_request *rq)
+{
+	int ret;
+
+	__i915_request_submit(rq);
+
+	trace_i915_request_in(rq, 0);
+
+	guc_set_lrc_tail(rq);
+	ret = guc_add_request(guc, rq);
+	if (ret == -EBUSY)
+		guc->stalled_request = rq;
+
+	return ret;
+}
+
  static void guc_submit_request(struct i915_request *rq)
  {
  	struct i915_sched_engine *sched_engine = rq->engine->sched_engine;
+	struct intel_guc *guc = &rq->engine->gt->uc.guc;
  	unsigned long flags;
/* Will be called from irq-context when using foreign fences. */
  	spin_lock_irqsave(&sched_engine->lock, flags);
- queue_request(sched_engine, rq, rq_prio(rq));
-
-	GEM_BUG_ON(i915_sched_engine_is_empty(sched_engine));
-	GEM_BUG_ON(list_empty(&rq->sched.link));
-
-	tasklet_hi_schedule(&sched_engine->tasklet);
+	if (guc->stalled_request || !i915_sched_engine_is_empty(sched_engine))
+		queue_request(sched_engine, rq, rq_prio(rq));
+	else if (guc_bypass_tasklet_submit(guc, rq) == -EBUSY)
+		tasklet_hi_schedule(&sched_engine->tasklet);
spin_unlock_irqrestore(&sched_engine->lock, flags);
  }

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