17  * While the engine is active, we send a periodic pulse along the engine
19  * is stuck, and we fail to preempt it, we declare the engine hung and
23 static bool next_heartbeat(struct intel_engine_cs *engine)  in next_heartbeat()  argument
27 	delay = READ_ONCE(engine->props.heartbeat_interval_ms);  in next_heartbeat()
34 	mod_delayed_work(system_highpri_wq, &engine->heartbeat.work, delay + 1);  in next_heartbeat()
51 static void idle_pulse(struct intel_engine_cs *engine, struct i915_request *rq)  in idle_pulse()  argument
53 	engine->wakeref_serial = READ_ONCE(engine->serial) + 1;  in idle_pulse()
55 	if (!engine->heartbeat.systole && intel_engine_has_heartbeat(engine))  in idle_pulse()
56 		engine->heartbeat.systole = i915_request_get(rq);  in idle_pulse()
62 	idle_pulse(rq->engine, rq);  in heartbeat_commit()
69 			   struct intel_engine_cs *engine)  in show_heartbeat()  argument
74 		intel_engine_dump(engine, &p,  in show_heartbeat()
76 				  engine->name);  in show_heartbeat()
78 		intel_engine_dump(engine, &p,  in show_heartbeat()
80 				  engine->name,  in show_heartbeat()
88 reset_engine(struct intel_engine_cs *engine, struct i915_request *rq)  in reset_engine()  argument
91 		show_heartbeat(rq, engine);  in reset_engine()
93 	if (intel_engine_uses_guc(engine))  in reset_engine()
99 		intel_guc_find_hung_context(engine);  in reset_engine()
101 	intel_gt_handle_error(engine->gt, engine->mask,  in reset_engine()
104 			      engine->name);  in reset_engine()
110 	struct intel_engine_cs *engine =  in heartbeat()  local
111 		container_of(wrk, typeof(*engine), heartbeat.work.work);  in heartbeat()
112 	struct intel_context *ce = engine->kernel_context;  in heartbeat()
117 	intel_engine_flush_submission(engine);  in heartbeat()
119 	rq = engine->heartbeat.systole;  in heartbeat()
122 		engine->heartbeat.systole = NULL;  in heartbeat()
125 	if (!intel_engine_pm_get_if_awake(engine))  in heartbeat()
128 	if (intel_gt_is_wedged(engine->gt))  in heartbeat()
131 	if (i915_sched_engine_disabled(engine->sched_engine)) {  in heartbeat()
132 		reset_engine(engine, engine->heartbeat.systole);  in heartbeat()
136 	if (engine->heartbeat.systole) {  in heartbeat()
137 		long delay = READ_ONCE(engine->props.heartbeat_interval_ms);  in heartbeat()
155 		} else if (engine->sched_engine->schedule &&  in heartbeat()
170 			engine->sched_engine->schedule(rq, &attr);  in heartbeat()
173 			reset_engine(engine, rq);  in heartbeat()
180 	serial = READ_ONCE(engine->serial);  in heartbeat()
181 	if (engine->wakeref_serial == serial)  in heartbeat()
185 		/* Unable to lock the kernel timeline, is the engine stuck? */  in heartbeat()
186 		if (xchg(&engine->heartbeat.blocked, serial) == serial)  in heartbeat()
187 			intel_gt_handle_error(engine->gt, engine->mask,  in heartbeat()
190 					      engine->name);  in heartbeat()
203 	if (!engine->i915->params.enable_hangcheck || !next_heartbeat(engine))  in heartbeat()
204 		i915_request_put(fetch_and_zero(&engine->heartbeat.systole));  in heartbeat()
205 	intel_engine_pm_put(engine);  in heartbeat()
208 void intel_engine_unpark_heartbeat(struct intel_engine_cs *engine)  in intel_engine_unpark_heartbeat()  argument
213 	next_heartbeat(engine);  in intel_engine_unpark_heartbeat()
216 void intel_engine_park_heartbeat(struct intel_engine_cs *engine)  in intel_engine_park_heartbeat()  argument
218 	if (cancel_delayed_work(&engine->heartbeat.work))  in intel_engine_park_heartbeat()
219 		i915_request_put(fetch_and_zero(&engine->heartbeat.systole));  in intel_engine_park_heartbeat()
224 	struct intel_engine_cs *engine;  in intel_gt_unpark_heartbeats()  local
227 	for_each_engine(engine, gt, id)  in intel_gt_unpark_heartbeats()
228 		if (intel_engine_pm_is_awake(engine))  in intel_gt_unpark_heartbeats()
229 			intel_engine_unpark_heartbeat(engine);  in intel_gt_unpark_heartbeats()
234 	struct intel_engine_cs *engine;  in intel_gt_park_heartbeats()  local
237 	for_each_engine(engine, gt, id)  in intel_gt_park_heartbeats()
238 		intel_engine_park_heartbeat(engine);  in intel_gt_park_heartbeats()
241 void intel_engine_init_heartbeat(struct intel_engine_cs *engine)  in intel_engine_init_heartbeat()  argument
243 	INIT_DELAYED_WORK(&engine->heartbeat.work, heartbeat);  in intel_engine_init_heartbeat()
246 static int __intel_engine_pulse(struct intel_engine_cs *engine)  in __intel_engine_pulse()  argument
249 	struct intel_context *ce = engine->kernel_context;  in __intel_engine_pulse()
253 	GEM_BUG_ON(!intel_engine_has_preemption(engine));  in __intel_engine_pulse()
254 	GEM_BUG_ON(!intel_engine_pm_is_awake(engine));  in __intel_engine_pulse()
268 static unsigned long set_heartbeat(struct intel_engine_cs *engine,  in set_heartbeat()  argument
273 	old = xchg(&engine->props.heartbeat_interval_ms, delay);  in set_heartbeat()
275 		intel_engine_unpark_heartbeat(engine);  in set_heartbeat()
277 		intel_engine_park_heartbeat(engine);  in set_heartbeat()
282 int intel_engine_set_heartbeat(struct intel_engine_cs *engine,  in intel_engine_set_heartbeat()  argument
285 	struct intel_context *ce = engine->kernel_context;  in intel_engine_set_heartbeat()
288 	if (!delay && !intel_engine_has_preempt_reset(engine))  in intel_engine_set_heartbeat()
291 	intel_engine_pm_get(engine);  in intel_engine_set_heartbeat()
297 	if (delay != engine->props.heartbeat_interval_ms) {  in intel_engine_set_heartbeat()
298 		unsigned long saved = set_heartbeat(engine, delay);  in intel_engine_set_heartbeat()
301 		if (intel_engine_has_preemption(engine)) {  in intel_engine_set_heartbeat()
302 			err = __intel_engine_pulse(engine);  in intel_engine_set_heartbeat()
304 				set_heartbeat(engine, saved);  in intel_engine_set_heartbeat()
311 	intel_engine_pm_put(engine);  in intel_engine_set_heartbeat()
315 int intel_engine_pulse(struct intel_engine_cs *engine)  in intel_engine_pulse()  argument
317 	struct intel_context *ce = engine->kernel_context;  in intel_engine_pulse()
320 	if (!intel_engine_has_preemption(engine))  in intel_engine_pulse()
323 	if (!intel_engine_pm_get_if_awake(engine))  in intel_engine_pulse()
328 		err = __intel_engine_pulse(engine);  in intel_engine_pulse()
332 	intel_engine_flush_submission(engine);  in intel_engine_pulse()
333 	intel_engine_pm_put(engine);  in intel_engine_pulse()
337 int intel_engine_flush_barriers(struct intel_engine_cs *engine)  in intel_engine_flush_barriers()  argument
340 	struct intel_context *ce = engine->kernel_context;  in intel_engine_flush_barriers()
344 	if (llist_empty(&engine->barrier_tasks))  in intel_engine_flush_barriers()
347 	if (!intel_engine_pm_get_if_awake(engine))  in intel_engine_flush_barriers()
367 	intel_engine_pm_put(engine);  in intel_engine_flush_barriers()