We only use sentinel requests for "preempt-to-idle" passes, so assert
that they are the only request in a new submission.
Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/i915/gt/intel_lrc.c | 21 +++++++++++++++++++++
1 file changed, 21 insertions(+)
diff --git a/drivers/gpu/drm/i915/gt/intel_lrc.c b/drivers/gpu/drm/i915/gt/intel_lrc.c
index 253e89fecd95..d907b5ebc1a4 100644
--- a/drivers/gpu/drm/i915/gt/intel_lrc.c
+++ b/drivers/gpu/drm/i915/gt/intel_lrc.c
@@ -1448,6 +1448,7 @@ assert_pending_valid(const struct intel_engine_execlists *execlists,
{
struct i915_request * const *port, *rq;
struct intel_context *ce = NULL;
+ bool sentinel = false;
trace_ports(execlists, msg, execlists->pending);
@@ -1481,6 +1482,26 @@ assert_pending_valid(const struct intel_engine_execlists *execlists,
}
ce = rq->context;
+ /*
+ * Sentinels are supposed to be lonely so they flush the
+ * current exection off the HW. Check that they are the
+ * only request in the pending submission.
+ */
+ if (sentinel) {
+ GEM_TRACE_ERR("context:%llx after sentinel in pending[%zd]\n",
+ ce->timeline->fence_context,
+ port - execlists->pending);
+ return false;
+ }
+
+ sentinel = i915_request_has_sentinel(rq);
+ if (sentinel && port != execlists->pending) {
+ GEM_TRACE_ERR("sentinel context:%llx not in prime position[%zd]\n",
+ ce->timeline->fence_context,
+ port - execlists->pending);
+ return false;
+ }
+
/* Hold tightly onto the lock to prevent concurrent retires! */
if (!spin_trylock_irqsave(&rq->lock, flags))
continue;
--
2.25.1
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