drm/i915/gt: Incorporate the virtual engine into timeslicing
It was quite the oversight to only factor in the normal queue to decide the timeslicing switch priority. By leaving out the next virtual request from the priority decision, we would not timeslice the current engine if there was an available virtual request. Testcase: igt/gem_exec_balancer/sliced Fixes:3df2deed41
("drm/i915/execlists: Enable timeslice on partial virtual engine dequeue") Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com> Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20200519132046.22443-3-chris@chris-wilson.co.uk (cherry picked from commit6ad249ba59
) Signed-off-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
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@ -1895,7 +1895,8 @@ static void defer_active(struct intel_engine_cs *engine)
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static bool
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need_timeslice(const struct intel_engine_cs *engine,
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const struct i915_request *rq)
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const struct i915_request *rq,
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const struct rb_node *rb)
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{
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int hint;
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@ -1903,6 +1904,24 @@ need_timeslice(const struct intel_engine_cs *engine,
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return false;
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hint = engine->execlists.queue_priority_hint;
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if (rb) {
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const struct virtual_engine *ve =
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rb_entry(rb, typeof(*ve), nodes[engine->id].rb);
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const struct intel_engine_cs *inflight =
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intel_context_inflight(&ve->context);
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if (!inflight || inflight == engine) {
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struct i915_request *next;
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rcu_read_lock();
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next = READ_ONCE(ve->request);
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if (next)
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hint = max(hint, rq_prio(next));
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rcu_read_unlock();
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}
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}
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if (!list_is_last(&rq->sched.link, &engine->active.requests))
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hint = max(hint, rq_prio(list_next_entry(rq, sched.link)));
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@ -1977,10 +1996,9 @@ static void set_timeslice(struct intel_engine_cs *engine)
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set_timer_ms(&engine->execlists.timer, duration);
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}
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static void start_timeslice(struct intel_engine_cs *engine)
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static void start_timeslice(struct intel_engine_cs *engine, int prio)
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{
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struct intel_engine_execlists *execlists = &engine->execlists;
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const int prio = queue_prio(execlists);
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unsigned long duration;
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if (!intel_engine_has_timeslices(engine))
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@ -2140,7 +2158,7 @@ static void execlists_dequeue(struct intel_engine_cs *engine)
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__unwind_incomplete_requests(engine);
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last = NULL;
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} else if (need_timeslice(engine, last) &&
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} else if (need_timeslice(engine, last, rb) &&
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timeslice_expired(execlists, last)) {
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if (i915_request_completed(last)) {
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tasklet_hi_schedule(&execlists->tasklet);
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@ -2188,7 +2206,7 @@ static void execlists_dequeue(struct intel_engine_cs *engine)
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* Even if ELSP[1] is occupied and not worthy
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* of timeslices, our queue might be.
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*/
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start_timeslice(engine);
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start_timeslice(engine, queue_prio(execlists));
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return;
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}
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}
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@ -2223,7 +2241,7 @@ static void execlists_dequeue(struct intel_engine_cs *engine)
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if (last && !can_merge_rq(last, rq)) {
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spin_unlock(&ve->base.active.lock);
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start_timeslice(engine);
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start_timeslice(engine, rq_prio(rq));
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return; /* leave this for another sibling */
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}
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