[PATCH 05/14] drm/i915: Check execlist/ring status during hangcheck

[Chris Wilson]

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 at chris-wilson.co.uk>
Reviewed-by: Michel Thierry <michel.thierry at intel.com>
---
 drivers/gpu/drm/i915/intel_hangcheck.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/intel_hangcheck.c b/drivers/gpu/drm/i915/intel_hangcheck.c
index 9b0ece427bdc..d9d87d96fb69 100644
--- a/drivers/gpu/drm/i915/intel_hangcheck.c
+++ b/drivers/gpu/drm/i915/intel_hangcheck.c
@@ -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);
-- 
2.13.3