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
28 	delay = READ_ONCE(engine->props.heartbeat_interval_ms);  in next_heartbeat()
30 	rq = engine->heartbeat.systole;  in next_heartbeat()
42 	    delay == engine->defaults.heartbeat_interval_ms) {  in next_heartbeat()
50 		longer = READ_ONCE(engine->props.preempt_timeout_ms) * 2;  in next_heartbeat()
51 		longer = intel_clamp_heartbeat_interval_ms(engine, longer);  in next_heartbeat()
62 	mod_delayed_work(system_highpri_wq, &engine->heartbeat.work, delay + 1);  in next_heartbeat()
79 static void idle_pulse(struct intel_engine_cs *engine, struct i915_request *rq)  in idle_pulse()  argument
81 	engine->wakeref_serial = READ_ONCE(engine->serial) + 1;  in idle_pulse()
83 	if (!engine->heartbeat.systole && intel_engine_has_heartbeat(engine))  in idle_pulse()
84 		engine->heartbeat.systole = i915_request_get(rq);  in idle_pulse()
90 	idle_pulse(rq->engine, rq);  in heartbeat_commit()
97 			   struct intel_engine_cs *engine)  in show_heartbeat()  argument
100 		drm_dbg_printer(&engine->i915->drm, DRM_UT_DRIVER, "heartbeat");  in show_heartbeat()
103 		intel_engine_dump(engine, &p,  in show_heartbeat()
105 				  engine->name);  in show_heartbeat()
107 		intel_engine_dump(engine, &p,  in show_heartbeat()
109 				  engine->name,  in show_heartbeat()
117 reset_engine(struct intel_engine_cs *engine, struct i915_request *rq)  in reset_engine()  argument
120 		show_heartbeat(rq, engine);  in reset_engine()
122 	if (intel_engine_uses_guc(engine))  in reset_engine()
128 		intel_guc_find_hung_context(engine);  in reset_engine()
130 	intel_gt_handle_error(engine->gt, engine->mask,  in reset_engine()
133 			      engine->name);  in reset_engine()
139 	struct intel_engine_cs *engine =  in heartbeat()  local
140 		container_of(wrk, typeof(*engine), heartbeat.work.work);  in heartbeat()
141 	struct intel_context *ce = engine->kernel_context;  in heartbeat()
146 	intel_engine_flush_submission(engine);  in heartbeat()
148 	rq = engine->heartbeat.systole;  in heartbeat()
151 		engine->heartbeat.systole = NULL;  in heartbeat()
154 	if (!intel_engine_pm_get_if_awake(engine))  in heartbeat()
157 	if (intel_gt_is_wedged(engine->gt))  in heartbeat()
160 	if (i915_sched_engine_disabled(engine->sched_engine)) {  in heartbeat()
161 		reset_engine(engine, engine->heartbeat.systole);  in heartbeat()
165 	if (engine->heartbeat.systole) {  in heartbeat()
166 		long delay = READ_ONCE(engine->props.heartbeat_interval_ms);  in heartbeat()
184 		} else if (engine->sched_engine->schedule &&  in heartbeat()
199 			engine->sched_engine->schedule(rq, &attr);  in heartbeat()
202 			reset_engine(engine, rq);  in heartbeat()
209 	serial = READ_ONCE(engine->serial);  in heartbeat()
210 	if (engine->wakeref_serial == serial)  in heartbeat()
214 		/* Unable to lock the kernel timeline, is the engine stuck? */  in heartbeat()
215 		if (xchg(&engine->heartbeat.blocked, serial) == serial)  in heartbeat()
216 			intel_gt_handle_error(engine->gt, engine->mask,  in heartbeat()
219 					      engine->name);  in heartbeat()
232 	if (!engine->i915->params.enable_hangcheck || !next_heartbeat(engine))  in heartbeat()
233 		i915_request_put(fetch_and_zero(&engine->heartbeat.systole));  in heartbeat()
234 	intel_engine_pm_put(engine);  in heartbeat()
237 void intel_engine_unpark_heartbeat(struct intel_engine_cs *engine)  in intel_engine_unpark_heartbeat()  argument
242 	next_heartbeat(engine);  in intel_engine_unpark_heartbeat()
245 void intel_engine_park_heartbeat(struct intel_engine_cs *engine)  in intel_engine_park_heartbeat()  argument
247 	if (cancel_delayed_work(&engine->heartbeat.work))  in intel_engine_park_heartbeat()
248 		i915_request_put(fetch_and_zero(&engine->heartbeat.systole));  in intel_engine_park_heartbeat()
253 	struct intel_engine_cs *engine;  in intel_gt_unpark_heartbeats()  local
256 	for_each_engine(engine, gt, id)  in intel_gt_unpark_heartbeats()
257 		if (intel_engine_pm_is_awake(engine))  in intel_gt_unpark_heartbeats()
258 			intel_engine_unpark_heartbeat(engine);  in intel_gt_unpark_heartbeats()
263 	struct intel_engine_cs *engine;  in intel_gt_park_heartbeats()  local
266 	for_each_engine(engine, gt, id)  in intel_gt_park_heartbeats()
267 		intel_engine_park_heartbeat(engine);  in intel_gt_park_heartbeats()
270 void intel_engine_init_heartbeat(struct intel_engine_cs *engine)  in intel_engine_init_heartbeat()  argument
272 	INIT_DELAYED_WORK(&engine->heartbeat.work, heartbeat);  in intel_engine_init_heartbeat()
275 static int __intel_engine_pulse(struct intel_engine_cs *engine)  in __intel_engine_pulse()  argument
278 	struct intel_context *ce = engine->kernel_context;  in __intel_engine_pulse()
282 	GEM_BUG_ON(!intel_engine_has_preemption(engine));  in __intel_engine_pulse()
283 	GEM_BUG_ON(!intel_engine_pm_is_awake(engine));  in __intel_engine_pulse()
295 	next_heartbeat(engine);  in __intel_engine_pulse()
300 static unsigned long set_heartbeat(struct intel_engine_cs *engine,  in set_heartbeat()  argument
305 	old = xchg(&engine->props.heartbeat_interval_ms, delay);  in set_heartbeat()
307 		intel_engine_unpark_heartbeat(engine);  in set_heartbeat()
309 		intel_engine_park_heartbeat(engine);  in set_heartbeat()
314 int intel_engine_set_heartbeat(struct intel_engine_cs *engine,  in intel_engine_set_heartbeat()  argument
317 	struct intel_context *ce = engine->kernel_context;  in intel_engine_set_heartbeat()
320 	if (!delay && !intel_engine_has_preempt_reset(engine))  in intel_engine_set_heartbeat()
324 	if (delay != engine->defaults.heartbeat_interval_ms &&  in intel_engine_set_heartbeat()
325 	    delay < 2 * engine->props.preempt_timeout_ms) {  in intel_engine_set_heartbeat()
326 		if (intel_engine_uses_guc(engine))  in intel_engine_set_heartbeat()
327 …drm_notice(&engine->i915->drm, "%s heartbeat interval adjusted to a non-default value which may do…  in intel_engine_set_heartbeat()
328 				   engine->name);  in intel_engine_set_heartbeat()
330 …drm_notice(&engine->i915->drm, "%s heartbeat interval adjusted to a non-default value which may ca…  in intel_engine_set_heartbeat()
331 				   engine->name);  in intel_engine_set_heartbeat()
334 	intel_engine_pm_get(engine);  in intel_engine_set_heartbeat()
340 	if (delay != engine->props.heartbeat_interval_ms) {  in intel_engine_set_heartbeat()
341 		unsigned long saved = set_heartbeat(engine, delay);  in intel_engine_set_heartbeat()
344 		if (intel_engine_has_preemption(engine)) {  in intel_engine_set_heartbeat()
345 			err = __intel_engine_pulse(engine);  in intel_engine_set_heartbeat()
347 				set_heartbeat(engine, saved);  in intel_engine_set_heartbeat()
354 	intel_engine_pm_put(engine);  in intel_engine_set_heartbeat()
358 int intel_engine_pulse(struct intel_engine_cs *engine)  in intel_engine_pulse()  argument
360 	struct intel_context *ce = engine->kernel_context;  in intel_engine_pulse()
363 	if (!intel_engine_has_preemption(engine))  in intel_engine_pulse()
366 	if (!intel_engine_pm_get_if_awake(engine))  in intel_engine_pulse()
371 		err = __intel_engine_pulse(engine);  in intel_engine_pulse()
375 	intel_engine_flush_submission(engine);  in intel_engine_pulse()
376 	intel_engine_pm_put(engine);  in intel_engine_pulse()
380 int intel_engine_flush_barriers(struct intel_engine_cs *engine)  in intel_engine_flush_barriers()  argument
383 	struct intel_context *ce = engine->kernel_context;  in intel_engine_flush_barriers()
387 	if (llist_empty(&engine->barrier_tasks))  in intel_engine_flush_barriers()
390 	if (!intel_engine_pm_get_if_awake(engine))  in intel_engine_flush_barriers()
410 	intel_engine_pm_put(engine);  in intel_engine_flush_barriers()