Add bypass tasklet submission path to GuC. The tasklet is only used if H2G channel has backpresure.
Signed-off-by: Matthew Brost matthew.brost@intel.com Reviewed-by: John Harrison John.C.Harrison@Intel.com --- .../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 ca0717166a27..53b4a5eb4a85 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); }