From 8db05f5947132bc69c8ad3fe65753400888aa483 Mon Sep 17 00:00:00 2001 From: Chris Wilson Date: Wed, 19 Sep 2018 20:55:16 +0100 Subject: [PATCH] drm/i915/execlists: Assert the queue is non-empty on unsubmitting In the sequence <0>[ 531.960431] drv_self-4806 7.... 527402570us : intel_gpu_reset: engine_mask=1, ret=0, retry=0 <0>[ 531.960431] drv_self-4806 7.... 527402571us : execlists_reset: rcs0 request global=115de, current=71133 <0>[ 531.960431] drv_self-4806 7d..1 527402571us : execlists_cancel_port_requests: rcs0:port0 global=71134 (fence 826b:198), (current 71133) <0>[ 531.960431] drv_self-4806 7d..1 527402572us : execlists_cancel_port_requests: rcs0:port1 global=71135 (fence 826c:53), (current 71133) <0>[ 531.960431] drv_self-4806 7d..1 527402572us : __i915_request_unsubmit: rcs0 fence 826c:53 <- global=71135, current 71133 <0>[ 531.960431] drv_self-4806 7d..1 527402579us : __i915_request_unsubmit: rcs0 fence 826b:198 <- global=71134, current 71133 <0>[ 531.960431] drv_self-4806 7.... 527402613us : intel_engine_cancel_stop_cs: rcs0 <0>[ 531.960431] drv_self-4806 7.... 527402624us : execlists_reset_finish: rcs0 we are missing the execlists_submission_tasklet() invocation before the execlists_reset_fini() implying that either the queue is empty, or we failed to schedule and run the tasklet on finish. Add an assert so we are sure that on unsubmitting the incomplete request after reset, the queue is indeed populated. Signed-off-by: Chris Wilson Reviewed-by: Tvrtko Ursulin Link: https://patchwork.freedesktop.org/patch/msgid/20180919195544.1511-12-chris@chris-wilson.co.uk --- drivers/gpu/drm/i915/intel_lrc.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c index 43957bb37a42..5b58c10bc600 100644 --- a/drivers/gpu/drm/i915/intel_lrc.c +++ b/drivers/gpu/drm/i915/intel_lrc.c @@ -344,6 +344,7 @@ static void __unwind_incomplete_requests(struct intel_engine_cs *engine) last_prio = rq_prio(rq); p = lookup_priolist(engine, last_prio); } + GEM_BUG_ON(RB_EMPTY_ROOT(&engine->execlists.queue.rb_root)); GEM_BUG_ON(p->priority != rq_prio(rq)); list_add(&rq->sched.link, &p->requests);