[PATCH 40/45] drm/i915/guc: Disable preemption if it fails

Chris Wilson chris at chris-wilson.co.uk
Sat Jul 14 11:02:53 UTC 2018


If we fail to tell the GuC to perform preemption, we get stuck
attempting to continually retry inject_preempt_context() until we
eventually timeout and reset the GPU (approximately emitting the same
warning 1000 times). Bail after the first failure, emit the WARN and
stop trying to do any further preemption on this engine.

References: https://intel-gfx-ci.01.org/tree/drm-tip/Trybot_2235/shard-apl4/igt@gem_exec_schedule@preempt-bsd.html
Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
Cc: Michal Wajdeczko <michal.wajdeczko at intel.com>
Cc: Michel Thierry <michel.thierry at intel.com>
Cc: Michałt Winiarski <michal.winiarski at intel.com>
---
 drivers/gpu/drm/i915/intel_guc_submission.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/drm/i915/intel_guc_submission.c b/drivers/gpu/drm/i915/intel_guc_submission.c
index 9acf4d2ec56c..c29ddfd8eedf 100644
--- a/drivers/gpu/drm/i915/intel_guc_submission.c
+++ b/drivers/gpu/drm/i915/intel_guc_submission.c
@@ -588,6 +588,7 @@ static void inject_preempt_context(struct work_struct *work)
 	data[6] = intel_guc_ggtt_offset(guc, guc->shared_data);
 
 	if (WARN_ON(intel_guc_send(guc, data, ARRAY_SIZE(data)))) {
+		engine->flags &= ~I915_ENGINE_HAS_PREEMPTION; /* XXX racy! */
 		execlists_clear_active(&engine->execlists,
 				       EXECLISTS_ACTIVE_PREEMPT);
 		tasklet_schedule(&engine->execlists.tasklet);
-- 
2.18.0



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