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drm/i915: Check execlist/ring status during hangcheck

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Before we declare an engine as idle, check if there are any pending
execlist context-switches and if the ring itself reports as idle.
Otherwise, we may be left in a situation where we miss a crucial
execlist event (or something more sinister) yet the requests complete.
Since the seqno write happens, we believe the engine to be truly idle.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Michel Thierry <michel.thierry@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20170721123238.16428-5-chris@chris-wilson.co.uk
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Chris Wilson 2017-07-21 13:32:23 +01:00 committed by Daniel Vetter
parent cdb6ded42f
commit 5cce5e31a7
1 changed files with 1 additions and 1 deletions
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2
drivers/gpu/drm/i915/intel_hangcheck.c
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@ -324,7 +324,7 @@ hangcheck_get_action(struct intel_engine_cs *engine,
if (engine->hangcheck.seqno != hc->seqno)
return ENGINE_ACTIVE_SEQNO;
if (i915_seqno_passed(hc->seqno, intel_engine_last_submit(engine)))
if (intel_engine_is_idle(engine))
return ENGINE_IDLE;
return engine_stuck(engine, hc->acthd);