174 static void tick_sched_do_timer(struct tick_sched *ts, ktime_t now)  in tick_sched_do_timer()  argument
205 	if (ts->last_tick_jiffies != jiffies) {  in tick_sched_do_timer()
206 		ts->stalled_jiffies = 0;  in tick_sched_do_timer()
207 		ts->last_tick_jiffies = READ_ONCE(jiffies);  in tick_sched_do_timer()
209 		if (++ts->stalled_jiffies == MAX_STALLED_JIFFIES) {  in tick_sched_do_timer()
211 			ts->stalled_jiffies = 0;  in tick_sched_do_timer()
212 			ts->last_tick_jiffies = READ_ONCE(jiffies);  in tick_sched_do_timer()
216 	if (ts->inidle)  in tick_sched_do_timer()
217 		ts->got_idle_tick = 1;  in tick_sched_do_timer()
220 static void tick_sched_handle(struct tick_sched *ts, struct pt_regs *regs)  in tick_sched_handle()  argument
231 	if (ts->tick_stopped) {  in tick_sched_handle()
234 			ts->idle_jiffies++;  in tick_sched_handle()
240 		ts->next_tick = 0;  in tick_sched_handle()
287 static bool can_stop_full_tick(int cpu, struct tick_sched *ts)  in can_stop_full_tick()  argument
297 	if (check_tick_dependency(&ts->tick_dep_mask))  in can_stop_full_tick()
431 	struct tick_sched *ts;  in tick_nohz_dep_set_cpu()  local
433 	ts = per_cpu_ptr(&tick_cpu_sched, cpu);  in tick_nohz_dep_set_cpu()
435 	prev = atomic_fetch_or(BIT(bit), &ts->tick_dep_mask);  in tick_nohz_dep_set_cpu()
453 	struct tick_sched *ts = per_cpu_ptr(&tick_cpu_sched, cpu);  in tick_nohz_dep_clear_cpu()  local
455 	atomic_andnot(BIT(bit), &ts->tick_dep_mask);  in tick_nohz_dep_clear_cpu()
508 	struct tick_sched *ts;  in __tick_nohz_task_switch()  local
513 	ts = this_cpu_ptr(&tick_cpu_sched);  in __tick_nohz_task_switch()
515 	if (ts->tick_stopped) {  in __tick_nohz_task_switch()
605 	struct tick_sched *ts = this_cpu_ptr(&tick_cpu_sched);  in tick_nohz_tick_stopped()  local
607 	return ts->tick_stopped;  in tick_nohz_tick_stopped()
612 	struct tick_sched *ts = per_cpu_ptr(&tick_cpu_sched, cpu);  in tick_nohz_tick_stopped_cpu()  local
614 	return ts->tick_stopped;  in tick_nohz_tick_stopped_cpu()
644 update_ts_time_stats(int cpu, struct tick_sched *ts, ktime_t now, u64 *last_update_time)  in update_ts_time_stats()  argument
648 	if (ts->idle_active) {  in update_ts_time_stats()
649 		delta = ktime_sub(now, ts->idle_entrytime);  in update_ts_time_stats()
651 			ts->iowait_sleeptime = ktime_add(ts->iowait_sleeptime, delta);  in update_ts_time_stats()
653 			ts->idle_sleeptime = ktime_add(ts->idle_sleeptime, delta);  in update_ts_time_stats()
654 		ts->idle_entrytime = now;  in update_ts_time_stats()
662 static void tick_nohz_stop_idle(struct tick_sched *ts, ktime_t now)  in tick_nohz_stop_idle()  argument
664 	update_ts_time_stats(smp_processor_id(), ts, now, NULL);  in tick_nohz_stop_idle()
665 	ts->idle_active = 0;  in tick_nohz_stop_idle()
670 static void tick_nohz_start_idle(struct tick_sched *ts)  in tick_nohz_start_idle()  argument
672 	ts->idle_entrytime = ktime_get();  in tick_nohz_start_idle()
673 	ts->idle_active = 1;  in tick_nohz_start_idle()
693 	struct tick_sched *ts = &per_cpu(tick_cpu_sched, cpu);  in get_cpu_idle_time_us()  local
701 		update_ts_time_stats(cpu, ts, now, last_update_time);  in get_cpu_idle_time_us()
702 		idle = ts->idle_sleeptime;  in get_cpu_idle_time_us()
704 		if (ts->idle_active && !nr_iowait_cpu(cpu)) {  in get_cpu_idle_time_us()
705 			ktime_t delta = ktime_sub(now, ts->idle_entrytime);  in get_cpu_idle_time_us()
707 			idle = ktime_add(ts->idle_sleeptime, delta);  in get_cpu_idle_time_us()
709 			idle = ts->idle_sleeptime;  in get_cpu_idle_time_us()
734 	struct tick_sched *ts = &per_cpu(tick_cpu_sched, cpu);  in get_cpu_iowait_time_us()  local
742 		update_ts_time_stats(cpu, ts, now, last_update_time);  in get_cpu_iowait_time_us()
743 		iowait = ts->iowait_sleeptime;  in get_cpu_iowait_time_us()
745 		if (ts->idle_active && nr_iowait_cpu(cpu) > 0) {  in get_cpu_iowait_time_us()
746 			ktime_t delta = ktime_sub(now, ts->idle_entrytime);  in get_cpu_iowait_time_us()
748 			iowait = ktime_add(ts->iowait_sleeptime, delta);  in get_cpu_iowait_time_us()
750 			iowait = ts->iowait_sleeptime;  in get_cpu_iowait_time_us()
758 static void tick_nohz_restart(struct tick_sched *ts, ktime_t now)  in tick_nohz_restart()  argument
760 	hrtimer_cancel(&ts->sched_timer);  in tick_nohz_restart()
761 	hrtimer_set_expires(&ts->sched_timer, ts->last_tick);  in tick_nohz_restart()
764 	hrtimer_forward(&ts->sched_timer, now, TICK_NSEC);  in tick_nohz_restart()
766 	if (ts->nohz_mode == NOHZ_MODE_HIGHRES) {  in tick_nohz_restart()
767 		hrtimer_start_expires(&ts->sched_timer,  in tick_nohz_restart()
770 		tick_program_event(hrtimer_get_expires(&ts->sched_timer), 1);  in tick_nohz_restart()
777 	ts->next_tick = 0;  in tick_nohz_restart()
785 static ktime_t tick_nohz_next_event(struct tick_sched *ts, int cpu)  in tick_nohz_next_event()  argument
797 	ts->last_jiffies = basejiff;  in tick_nohz_next_event()
798 	ts->timer_expires_base = basemono;  in tick_nohz_next_event()
822 		ts->next_timer = next_tick;  in tick_nohz_next_event()
840 		if (!ts->tick_stopped) {  in tick_nohz_next_event()
841 			ts->timer_expires = 0;  in tick_nohz_next_event()
853 	    (tick_do_timer_cpu != TICK_DO_TIMER_NONE || !ts->do_timer_last))  in tick_nohz_next_event()
862 	ts->timer_expires = min_t(u64, expires, next_tick);  in tick_nohz_next_event()
865 	return ts->timer_expires;  in tick_nohz_next_event()
868 static void tick_nohz_stop_tick(struct tick_sched *ts, int cpu)  in tick_nohz_stop_tick()  argument
871 	u64 basemono = ts->timer_expires_base;  in tick_nohz_stop_tick()
872 	u64 expires = ts->timer_expires;  in tick_nohz_stop_tick()
876 	ts->timer_expires_base = 0;  in tick_nohz_stop_tick()
888 		ts->do_timer_last = 1;  in tick_nohz_stop_tick()
890 		ts->do_timer_last = 0;  in tick_nohz_stop_tick()
894 	if (ts->tick_stopped && (expires == ts->next_tick)) {  in tick_nohz_stop_tick()
896 		if (tick == KTIME_MAX || ts->next_tick == hrtimer_get_expires(&ts->sched_timer))  in tick_nohz_stop_tick()
900 …printk_once("basemono: %llu ts->next_tick: %llu dev->next_event: %llu timer->active: %d timer->exp…  in tick_nohz_stop_tick()
901 			    basemono, ts->next_tick, dev->next_event,  in tick_nohz_stop_tick()
902 			    hrtimer_active(&ts->sched_timer), hrtimer_get_expires(&ts->sched_timer));  in tick_nohz_stop_tick()
912 	if (!ts->tick_stopped) {  in tick_nohz_stop_tick()
916 		ts->last_tick = hrtimer_get_expires(&ts->sched_timer);  in tick_nohz_stop_tick()
917 		ts->tick_stopped = 1;  in tick_nohz_stop_tick()
921 	ts->next_tick = tick;  in tick_nohz_stop_tick()
928 		if (ts->nohz_mode == NOHZ_MODE_HIGHRES)  in tick_nohz_stop_tick()
929 			hrtimer_cancel(&ts->sched_timer);  in tick_nohz_stop_tick()
935 	if (ts->nohz_mode == NOHZ_MODE_HIGHRES) {  in tick_nohz_stop_tick()
936 		hrtimer_start(&ts->sched_timer, tick,  in tick_nohz_stop_tick()
939 		hrtimer_set_expires(&ts->sched_timer, tick);  in tick_nohz_stop_tick()
944 static void tick_nohz_retain_tick(struct tick_sched *ts)  in tick_nohz_retain_tick()  argument
946 	ts->timer_expires_base = 0;  in tick_nohz_retain_tick()
950 static void tick_nohz_stop_sched_tick(struct tick_sched *ts, int cpu)  in tick_nohz_stop_sched_tick()  argument
952 	if (tick_nohz_next_event(ts, cpu))  in tick_nohz_stop_sched_tick()
953 		tick_nohz_stop_tick(ts, cpu);  in tick_nohz_stop_sched_tick()
955 		tick_nohz_retain_tick(ts);  in tick_nohz_stop_sched_tick()
959 static void tick_nohz_restart_sched_tick(struct tick_sched *ts, ktime_t now)  in tick_nohz_restart_sched_tick()  argument
975 	ts->tick_stopped  = 0;  in tick_nohz_restart_sched_tick()
976 	tick_nohz_restart(ts, now);  in tick_nohz_restart_sched_tick()
979 static void __tick_nohz_full_update_tick(struct tick_sched *ts,  in __tick_nohz_full_update_tick()  argument
985 	if (can_stop_full_tick(cpu, ts))  in __tick_nohz_full_update_tick()
986 		tick_nohz_stop_sched_tick(ts, cpu);  in __tick_nohz_full_update_tick()
987 	else if (ts->tick_stopped)  in __tick_nohz_full_update_tick()
988 		tick_nohz_restart_sched_tick(ts, now);  in __tick_nohz_full_update_tick()
992 static void tick_nohz_full_update_tick(struct tick_sched *ts)  in tick_nohz_full_update_tick()  argument
997 	if (!ts->tick_stopped && ts->nohz_mode == NOHZ_MODE_INACTIVE)  in tick_nohz_full_update_tick()
1000 	__tick_nohz_full_update_tick(ts, ktime_get());  in tick_nohz_full_update_tick()
1042 static bool can_stop_idle_tick(int cpu, struct tick_sched *ts)  in can_stop_idle_tick()  argument
1058 		ts->next_tick = 0;  in can_stop_idle_tick()
1062 	if (unlikely(ts->nohz_mode == NOHZ_MODE_INACTIVE))  in can_stop_idle_tick()
1087 static void __tick_nohz_idle_stop_tick(struct tick_sched *ts)  in __tick_nohz_idle_stop_tick()  argument
1096 	if (ts->timer_expires_base)  in __tick_nohz_idle_stop_tick()
1097 		expires = ts->timer_expires;  in __tick_nohz_idle_stop_tick()
1098 	else if (can_stop_idle_tick(cpu, ts))  in __tick_nohz_idle_stop_tick()
1099 		expires = tick_nohz_next_event(ts, cpu);  in __tick_nohz_idle_stop_tick()
1103 	ts->idle_calls++;  in __tick_nohz_idle_stop_tick()
1106 		int was_stopped = ts->tick_stopped;  in __tick_nohz_idle_stop_tick()
1108 		tick_nohz_stop_tick(ts, cpu);  in __tick_nohz_idle_stop_tick()
1110 		ts->idle_sleeps++;  in __tick_nohz_idle_stop_tick()
1111 		ts->idle_expires = expires;  in __tick_nohz_idle_stop_tick()
1113 		if (!was_stopped && ts->tick_stopped) {  in __tick_nohz_idle_stop_tick()
1114 			ts->idle_jiffies = ts->last_jiffies;  in __tick_nohz_idle_stop_tick()
1118 		tick_nohz_retain_tick(ts);  in __tick_nohz_idle_stop_tick()
1149 	struct tick_sched *ts;  in tick_nohz_idle_enter()  local
1155 	ts = this_cpu_ptr(&tick_cpu_sched);  in tick_nohz_idle_enter()
1157 	WARN_ON_ONCE(ts->timer_expires_base);  in tick_nohz_idle_enter()
1159 	ts->inidle = 1;  in tick_nohz_idle_enter()
1160 	tick_nohz_start_idle(ts);  in tick_nohz_idle_enter()
1175 	struct tick_sched *ts = this_cpu_ptr(&tick_cpu_sched);  in tick_nohz_irq_exit()  local
1177 	if (ts->inidle)  in tick_nohz_irq_exit()
1178 		tick_nohz_start_idle(ts);  in tick_nohz_irq_exit()
1180 		tick_nohz_full_update_tick(ts);  in tick_nohz_irq_exit()
1188 	struct tick_sched *ts = this_cpu_ptr(&tick_cpu_sched);  in tick_nohz_idle_got_tick()  local
1190 	if (ts->got_idle_tick) {  in tick_nohz_idle_got_tick()
1191 		ts->got_idle_tick = 0;  in tick_nohz_idle_got_tick()
1222 	struct tick_sched *ts = this_cpu_ptr(&tick_cpu_sched);  in tick_nohz_get_sleep_length()  local
1228 	ktime_t now = ts->idle_entrytime;  in tick_nohz_get_sleep_length()
1231 	WARN_ON_ONCE(!ts->inidle);  in tick_nohz_get_sleep_length()
1235 	if (!can_stop_idle_tick(cpu, ts))  in tick_nohz_get_sleep_length()
1238 	next_event = tick_nohz_next_event(ts, cpu);  in tick_nohz_get_sleep_length()
1247 			   hrtimer_next_event_without(&ts->sched_timer));  in tick_nohz_get_sleep_length()
1260 	struct tick_sched *ts = tick_get_tick_sched(cpu);  in tick_nohz_get_idle_calls_cpu()  local
1262 	return ts->idle_calls;  in tick_nohz_get_idle_calls_cpu()
1272 	struct tick_sched *ts = this_cpu_ptr(&tick_cpu_sched);  in tick_nohz_get_idle_calls()  local
1274 	return ts->idle_calls;  in tick_nohz_get_idle_calls()
1277 static void tick_nohz_account_idle_time(struct tick_sched *ts,  in tick_nohz_account_idle_time()  argument
1282 	ts->idle_exittime = now;  in tick_nohz_account_idle_time()
1291 	ticks = jiffies - ts->idle_jiffies;  in tick_nohz_account_idle_time()
1301 	struct tick_sched *ts = this_cpu_ptr(&tick_cpu_sched);  in tick_nohz_idle_restart_tick()  local
1303 	if (ts->tick_stopped) {  in tick_nohz_idle_restart_tick()
1305 		tick_nohz_restart_sched_tick(ts, now);  in tick_nohz_idle_restart_tick()
1306 		tick_nohz_account_idle_time(ts, now);  in tick_nohz_idle_restart_tick()
1310 static void tick_nohz_idle_update_tick(struct tick_sched *ts, ktime_t now)  in tick_nohz_idle_update_tick()  argument
1313 		__tick_nohz_full_update_tick(ts, now);  in tick_nohz_idle_update_tick()
1315 		tick_nohz_restart_sched_tick(ts, now);  in tick_nohz_idle_update_tick()
1317 	tick_nohz_account_idle_time(ts, now);  in tick_nohz_idle_update_tick()
1329 	struct tick_sched *ts = this_cpu_ptr(&tick_cpu_sched);  in tick_nohz_idle_exit()  local
1335 	WARN_ON_ONCE(!ts->inidle);  in tick_nohz_idle_exit()
1336 	WARN_ON_ONCE(ts->timer_expires_base);  in tick_nohz_idle_exit()
1338 	ts->inidle = 0;  in tick_nohz_idle_exit()
1339 	idle_active = ts->idle_active;  in tick_nohz_idle_exit()
1340 	tick_stopped = ts->tick_stopped;  in tick_nohz_idle_exit()
1346 		tick_nohz_stop_idle(ts, now);  in tick_nohz_idle_exit()
1349 		tick_nohz_idle_update_tick(ts, now);  in tick_nohz_idle_exit()
1359 	struct tick_sched *ts = this_cpu_ptr(&tick_cpu_sched);  in tick_nohz_handler()  local
1365 	tick_sched_do_timer(ts, now);  in tick_nohz_handler()
1366 	tick_sched_handle(ts, regs);  in tick_nohz_handler()
1368 	if (unlikely(ts->tick_stopped)) {  in tick_nohz_handler()
1378 	hrtimer_forward(&ts->sched_timer, now, TICK_NSEC);  in tick_nohz_handler()
1379 	tick_program_event(hrtimer_get_expires(&ts->sched_timer), 1);  in tick_nohz_handler()
1382 static inline void tick_nohz_activate(struct tick_sched *ts, int mode)  in tick_nohz_activate()  argument
1386 	ts->nohz_mode = mode;  in tick_nohz_activate()
1397 	struct tick_sched *ts = this_cpu_ptr(&tick_cpu_sched);  in tick_nohz_switch_to_nohz()  local
1407 	 * Recycle the hrtimer in ts, so we can share the  in tick_nohz_switch_to_nohz()
1410 	hrtimer_init(&ts->sched_timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS_HARD);  in tick_nohz_switch_to_nohz()
1414 	hrtimer_set_expires(&ts->sched_timer, next);  in tick_nohz_switch_to_nohz()
1415 	hrtimer_forward_now(&ts->sched_timer, TICK_NSEC);  in tick_nohz_switch_to_nohz()
1416 	tick_program_event(hrtimer_get_expires(&ts->sched_timer), 1);  in tick_nohz_switch_to_nohz()
1417 	tick_nohz_activate(ts, NOHZ_MODE_LOWRES);  in tick_nohz_switch_to_nohz()
1422 	struct tick_sched *ts = this_cpu_ptr(&tick_cpu_sched);  in tick_nohz_irq_enter()  local
1425 	if (!ts->idle_active && !ts->tick_stopped)  in tick_nohz_irq_enter()
1428 	if (ts->idle_active)  in tick_nohz_irq_enter()
1429 		tick_nohz_stop_idle(ts, now);  in tick_nohz_irq_enter()
1437 	if (ts->tick_stopped)  in tick_nohz_irq_enter()
1445 static inline void tick_nohz_activate(struct tick_sched *ts, int mode) { }  in tick_nohz_activate()  argument
1468 	struct tick_sched *ts =  in tick_sched_timer()  local
1473 	tick_sched_do_timer(ts, now);  in tick_sched_timer()
1480 		tick_sched_handle(ts, regs);  in tick_sched_timer()
1482 		ts->next_tick = 0;  in tick_sched_timer()
1485 	if (unlikely(ts->tick_stopped))  in tick_sched_timer()
1508 	struct tick_sched *ts = this_cpu_ptr(&tick_cpu_sched);  in tick_setup_sched_timer()  local
1514 	hrtimer_init(&ts->sched_timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS_HARD);  in tick_setup_sched_timer()
1515 	ts->sched_timer.function = tick_sched_timer;  in tick_setup_sched_timer()
1518 	hrtimer_set_expires(&ts->sched_timer, tick_init_jiffy_update());  in tick_setup_sched_timer()
1525 		hrtimer_add_expires_ns(&ts->sched_timer, offset);  in tick_setup_sched_timer()
1528 	hrtimer_forward(&ts->sched_timer, now, TICK_NSEC);  in tick_setup_sched_timer()
1529 	hrtimer_start_expires(&ts->sched_timer, HRTIMER_MODE_ABS_PINNED_HARD);  in tick_setup_sched_timer()
1530 	tick_nohz_activate(ts, NOHZ_MODE_HIGHRES);  in tick_setup_sched_timer()
1537 	struct tick_sched *ts = &per_cpu(tick_cpu_sched, cpu);  in tick_cancel_sched_timer()  local
1540 	if (ts->sched_timer.base)  in tick_cancel_sched_timer()
1541 		hrtimer_cancel(&ts->sched_timer);  in tick_cancel_sched_timer()
1544 	memset(ts, 0, sizeof(*ts));  in tick_cancel_sched_timer()
1564 	struct tick_sched *ts = this_cpu_ptr(&tick_cpu_sched);  in tick_oneshot_notify()  local
1566 	set_bit(0, &ts->check_clocks);  in tick_oneshot_notify()
1579 	struct tick_sched *ts = this_cpu_ptr(&tick_cpu_sched);  in tick_check_oneshot_change()  local
1581 	if (!test_and_clear_bit(0, &ts->check_clocks))  in tick_check_oneshot_change()
1584 	if (ts->nohz_mode != NOHZ_MODE_INACTIVE)  in tick_check_oneshot_change()