[PATCH 16/51] drm/i915/gt: Specify a deadline for the heartbeat

[Chris Wilson]

As we know when we expect the heartbeat to be checked for completion,
pass this information along as its deadline. We still do not complain if
the deadline is missed, at least until we have tried a few times, but it
will allow for quicker hang detection on systems where deadlines are
adhered to.

Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
---
 drivers/gpu/drm/i915/gt/intel_engine_heartbeat.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/drivers/gpu/drm/i915/gt/intel_engine_heartbeat.c b/drivers/gpu/drm/i915/gt/intel_engine_heartbeat.c
index 4ed525962cfd..1f53dc72f131 100644
--- a/drivers/gpu/drm/i915/gt/intel_engine_heartbeat.c
+++ b/drivers/gpu/drm/i915/gt/intel_engine_heartbeat.c
@@ -136,6 +136,16 @@ static void heartbeat_commit(struct i915_request *rq,
 	__i915_request_queue(rq, attr);
 }
 
+static void set_heartbeat_deadline(struct intel_engine_cs *engine,
+				   struct i915_request *rq)
+{
+	unsigned long interval;
+
+	interval = READ_ONCE(engine->props.heartbeat_interval_ms);
+	if (interval)
+		i915_request_set_deadline(rq, ktime_get() + (interval << 20));
+}
+
 static void show_heartbeat(const struct i915_request *rq,
 			   struct intel_engine_cs *engine)
 {
@@ -204,6 +214,8 @@ static void heartbeat(struct work_struct *wrk)
 				attr.priority = I915_PRIORITY_BARRIER;
 
 			local_bh_disable();
+			if (attr.priority == I915_PRIORITY_BARRIER)
+				i915_request_set_deadline(rq, 0);
 			i915_request_set_priority(rq, attr.priority);
 			local_bh_enable();
 		} else {
@@ -243,6 +255,7 @@ static void heartbeat(struct work_struct *wrk)
 	if (IS_ERR(rq))
 		goto unlock;
 
+	set_heartbeat_deadline(engine, rq);
 	heartbeat_commit(rq, &attr);
 
 unlock:
-- 
2.20.1