113 static void tick_sched_do_timer(struct tick_sched *ts, ktime_t now)  in tick_sched_do_timer()  argument
140 	if (ts->inidle)  in tick_sched_do_timer()
141 		ts->got_idle_tick = 1;  in tick_sched_do_timer()
144 static void tick_sched_handle(struct tick_sched *ts, struct pt_regs *regs)  in tick_sched_handle()  argument
155 	if (ts->tick_stopped) {  in tick_sched_handle()
158 			ts->idle_jiffies++;  in tick_sched_handle()
164 		ts->next_tick = 0;  in tick_sched_handle()
204 static bool can_stop_full_tick(int cpu, struct tick_sched *ts)  in can_stop_full_tick()  argument
214 	if (check_tick_dependency(&ts->tick_dep_mask))  in can_stop_full_tick()
309 	struct tick_sched *ts;  in tick_nohz_dep_set_cpu()  local
311 	ts = per_cpu_ptr(&tick_cpu_sched, cpu);  in tick_nohz_dep_set_cpu()
313 	prev = atomic_fetch_or(BIT(bit), &ts->tick_dep_mask);  in tick_nohz_dep_set_cpu()
330 	struct tick_sched *ts = per_cpu_ptr(&tick_cpu_sched, cpu);  in tick_nohz_dep_clear_cpu()  local
332 	atomic_andnot(BIT(bit), &ts->tick_dep_mask);  in tick_nohz_dep_clear_cpu()
375 	struct tick_sched *ts;  in __tick_nohz_task_switch()  local
382 	ts = this_cpu_ptr(&tick_cpu_sched);  in __tick_nohz_task_switch()
384 	if (ts->tick_stopped) {  in __tick_nohz_task_switch()
476 	struct tick_sched *ts = this_cpu_ptr(&tick_cpu_sched);  in tick_nohz_tick_stopped()  local
478 	return ts->tick_stopped;  in tick_nohz_tick_stopped()
483 	struct tick_sched *ts = per_cpu_ptr(&tick_cpu_sched, cpu);  in tick_nohz_tick_stopped_cpu()  local
485 	return ts->tick_stopped;  in tick_nohz_tick_stopped_cpu()
515 update_ts_time_stats(int cpu, struct tick_sched *ts, ktime_t now, u64 *last_update_time)  in update_ts_time_stats()  argument
519 	if (ts->idle_active) {  in update_ts_time_stats()
520 		delta = ktime_sub(now, ts->idle_entrytime);  in update_ts_time_stats()
522 			ts->iowait_sleeptime = ktime_add(ts->iowait_sleeptime, delta);  in update_ts_time_stats()
524 			ts->idle_sleeptime = ktime_add(ts->idle_sleeptime, delta);  in update_ts_time_stats()
525 		ts->idle_entrytime = now;  in update_ts_time_stats()
533 static void tick_nohz_stop_idle(struct tick_sched *ts, ktime_t now)  in tick_nohz_stop_idle()  argument
535 	update_ts_time_stats(smp_processor_id(), ts, now, NULL);  in tick_nohz_stop_idle()
536 	ts->idle_active = 0;  in tick_nohz_stop_idle()
541 static void tick_nohz_start_idle(struct tick_sched *ts)  in tick_nohz_start_idle()  argument
543 	ts->idle_entrytime = ktime_get();  in tick_nohz_start_idle()
544 	ts->idle_active = 1;  in tick_nohz_start_idle()
564 	struct tick_sched *ts = &per_cpu(tick_cpu_sched, cpu);  in get_cpu_idle_time_us()  local
572 		update_ts_time_stats(cpu, ts, now, last_update_time);  in get_cpu_idle_time_us()
573 		idle = ts->idle_sleeptime;  in get_cpu_idle_time_us()
575 		if (ts->idle_active && !nr_iowait_cpu(cpu)) {  in get_cpu_idle_time_us()
576 			ktime_t delta = ktime_sub(now, ts->idle_entrytime);  in get_cpu_idle_time_us()
578 			idle = ktime_add(ts->idle_sleeptime, delta);  in get_cpu_idle_time_us()
580 			idle = ts->idle_sleeptime;  in get_cpu_idle_time_us()
605 	struct tick_sched *ts = &per_cpu(tick_cpu_sched, cpu);  in get_cpu_iowait_time_us()  local
613 		update_ts_time_stats(cpu, ts, now, last_update_time);  in get_cpu_iowait_time_us()
614 		iowait = ts->iowait_sleeptime;  in get_cpu_iowait_time_us()
616 		if (ts->idle_active && nr_iowait_cpu(cpu) > 0) {  in get_cpu_iowait_time_us()
617 			ktime_t delta = ktime_sub(now, ts->idle_entrytime);  in get_cpu_iowait_time_us()
619 			iowait = ktime_add(ts->iowait_sleeptime, delta);  in get_cpu_iowait_time_us()
621 			iowait = ts->iowait_sleeptime;  in get_cpu_iowait_time_us()
629 static void tick_nohz_restart(struct tick_sched *ts, ktime_t now)  in tick_nohz_restart()  argument
631 	hrtimer_cancel(&ts->sched_timer);  in tick_nohz_restart()
632 	hrtimer_set_expires(&ts->sched_timer, ts->last_tick);  in tick_nohz_restart()
635 	hrtimer_forward(&ts->sched_timer, now, tick_period);  in tick_nohz_restart()
637 	if (ts->nohz_mode == NOHZ_MODE_HIGHRES) {  in tick_nohz_restart()
638 		hrtimer_start_expires(&ts->sched_timer,  in tick_nohz_restart()
641 		tick_program_event(hrtimer_get_expires(&ts->sched_timer), 1);  in tick_nohz_restart()
648 	ts->next_tick = 0;  in tick_nohz_restart()
656 static ktime_t tick_nohz_next_event(struct tick_sched *ts, int cpu)  in tick_nohz_next_event()  argument
668 	ts->last_jiffies = basejiff;  in tick_nohz_next_event()
669 	ts->timer_expires_base = basemono;  in tick_nohz_next_event()
693 		ts->next_timer = next_tmr;  in tick_nohz_next_event()
713 		if (!ts->tick_stopped) {  in tick_nohz_next_event()
714 			ts->timer_expires = 0;  in tick_nohz_next_event()
726 	    (tick_do_timer_cpu != TICK_DO_TIMER_NONE || !ts->do_timer_last))  in tick_nohz_next_event()
735 	ts->timer_expires = min_t(u64, expires, next_tick);  in tick_nohz_next_event()
738 	return ts->timer_expires;  in tick_nohz_next_event()
741 static void tick_nohz_stop_tick(struct tick_sched *ts, int cpu)  in tick_nohz_stop_tick()  argument
744 	u64 basemono = ts->timer_expires_base;  in tick_nohz_stop_tick()
745 	u64 expires = ts->timer_expires;  in tick_nohz_stop_tick()
749 	ts->timer_expires_base = 0;  in tick_nohz_stop_tick()
761 		ts->do_timer_last = 1;  in tick_nohz_stop_tick()
763 		ts->do_timer_last = 0;  in tick_nohz_stop_tick()
767 	if (ts->tick_stopped && (expires == ts->next_tick)) {  in tick_nohz_stop_tick()
769 		if (tick == KTIME_MAX || ts->next_tick == hrtimer_get_expires(&ts->sched_timer))  in tick_nohz_stop_tick()
774 			    basemono, ts->next_tick, dev->next_event,  in tick_nohz_stop_tick()
775 			    hrtimer_active(&ts->sched_timer), hrtimer_get_expires(&ts->sched_timer));  in tick_nohz_stop_tick()
785 	if (!ts->tick_stopped) {  in tick_nohz_stop_tick()
789 		ts->last_tick = hrtimer_get_expires(&ts->sched_timer);  in tick_nohz_stop_tick()
790 		ts->tick_stopped = 1;  in tick_nohz_stop_tick()
794 	ts->next_tick = tick;  in tick_nohz_stop_tick()
801 		if (ts->nohz_mode == NOHZ_MODE_HIGHRES)  in tick_nohz_stop_tick()
802 			hrtimer_cancel(&ts->sched_timer);  in tick_nohz_stop_tick()
806 	if (ts->nohz_mode == NOHZ_MODE_HIGHRES) {  in tick_nohz_stop_tick()
807 		hrtimer_start(&ts->sched_timer, tick,  in tick_nohz_stop_tick()
810 		hrtimer_set_expires(&ts->sched_timer, tick);  in tick_nohz_stop_tick()
815 static void tick_nohz_retain_tick(struct tick_sched *ts)  in tick_nohz_retain_tick()  argument
817 	ts->timer_expires_base = 0;  in tick_nohz_retain_tick()
821 static void tick_nohz_stop_sched_tick(struct tick_sched *ts, int cpu)  in tick_nohz_stop_sched_tick()  argument
823 	if (tick_nohz_next_event(ts, cpu))  in tick_nohz_stop_sched_tick()
824 		tick_nohz_stop_tick(ts, cpu);  in tick_nohz_stop_sched_tick()
826 		tick_nohz_retain_tick(ts);  in tick_nohz_stop_sched_tick()
830 static void tick_nohz_restart_sched_tick(struct tick_sched *ts, ktime_t now)  in tick_nohz_restart_sched_tick()  argument
846 	ts->tick_stopped  = 0;  in tick_nohz_restart_sched_tick()
847 	ts->idle_exittime = now;  in tick_nohz_restart_sched_tick()
849 	tick_nohz_restart(ts, now);  in tick_nohz_restart_sched_tick()
852 static void tick_nohz_full_update_tick(struct tick_sched *ts)  in tick_nohz_full_update_tick()  argument
860 	if (!ts->tick_stopped && ts->nohz_mode == NOHZ_MODE_INACTIVE)  in tick_nohz_full_update_tick()
863 	if (can_stop_full_tick(cpu, ts))  in tick_nohz_full_update_tick()
864 		tick_nohz_stop_sched_tick(ts, cpu);  in tick_nohz_full_update_tick()
865 	else if (ts->tick_stopped)  in tick_nohz_full_update_tick()
866 		tick_nohz_restart_sched_tick(ts, ktime_get());  in tick_nohz_full_update_tick()
870 static bool can_stop_idle_tick(int cpu, struct tick_sched *ts)  in can_stop_idle_tick()  argument
886 		ts->next_tick = 0;  in can_stop_idle_tick()
890 	if (unlikely(ts->nohz_mode == NOHZ_MODE_INACTIVE))  in can_stop_idle_tick()
931 static void __tick_nohz_idle_stop_tick(struct tick_sched *ts)  in __tick_nohz_idle_stop_tick()  argument
940 	if (ts->timer_expires_base)  in __tick_nohz_idle_stop_tick()
941 		expires = ts->timer_expires;  in __tick_nohz_idle_stop_tick()
942 	else if (can_stop_idle_tick(cpu, ts))  in __tick_nohz_idle_stop_tick()
943 		expires = tick_nohz_next_event(ts, cpu);  in __tick_nohz_idle_stop_tick()
947 	ts->idle_calls++;  in __tick_nohz_idle_stop_tick()
950 		int was_stopped = ts->tick_stopped;  in __tick_nohz_idle_stop_tick()
952 		tick_nohz_stop_tick(ts, cpu);  in __tick_nohz_idle_stop_tick()
954 		ts->idle_sleeps++;  in __tick_nohz_idle_stop_tick()
955 		ts->idle_expires = expires;  in __tick_nohz_idle_stop_tick()
957 		if (!was_stopped && ts->tick_stopped) {  in __tick_nohz_idle_stop_tick()
958 			ts->idle_jiffies = ts->last_jiffies;  in __tick_nohz_idle_stop_tick()
962 		tick_nohz_retain_tick(ts);  in __tick_nohz_idle_stop_tick()
993 	struct tick_sched *ts;  in tick_nohz_idle_enter()  local
999 	ts = this_cpu_ptr(&tick_cpu_sched);  in tick_nohz_idle_enter()
1001 	WARN_ON_ONCE(ts->timer_expires_base);  in tick_nohz_idle_enter()
1003 	ts->inidle = 1;  in tick_nohz_idle_enter()
1004 	tick_nohz_start_idle(ts);  in tick_nohz_idle_enter()
1019 	struct tick_sched *ts = this_cpu_ptr(&tick_cpu_sched);  in tick_nohz_irq_exit()  local
1021 	if (ts->inidle)  in tick_nohz_irq_exit()
1022 		tick_nohz_start_idle(ts);  in tick_nohz_irq_exit()
1024 		tick_nohz_full_update_tick(ts);  in tick_nohz_irq_exit()
1032 	struct tick_sched *ts = this_cpu_ptr(&tick_cpu_sched);  in tick_nohz_idle_got_tick()  local
1034 	if (ts->got_idle_tick) {  in tick_nohz_idle_got_tick()
1035 		ts->got_idle_tick = 0;  in tick_nohz_idle_got_tick()
1062 	struct tick_sched *ts = this_cpu_ptr(&tick_cpu_sched);  in tick_nohz_get_sleep_length()  local
1068 	ktime_t now = ts->idle_entrytime;  in tick_nohz_get_sleep_length()
1071 	WARN_ON_ONCE(!ts->inidle);  in tick_nohz_get_sleep_length()
1075 	if (!can_stop_idle_tick(cpu, ts))  in tick_nohz_get_sleep_length()
1078 	next_event = tick_nohz_next_event(ts, cpu);  in tick_nohz_get_sleep_length()
1087 			   hrtimer_next_event_without(&ts->sched_timer));  in tick_nohz_get_sleep_length()
1100 	struct tick_sched *ts = tick_get_tick_sched(cpu);  in tick_nohz_get_idle_calls_cpu()  local
1102 	return ts->idle_calls;  in tick_nohz_get_idle_calls_cpu()
1112 	struct tick_sched *ts = this_cpu_ptr(&tick_cpu_sched);  in tick_nohz_get_idle_calls()  local
1114 	return ts->idle_calls;  in tick_nohz_get_idle_calls()
1117 static void tick_nohz_account_idle_ticks(struct tick_sched *ts)  in tick_nohz_account_idle_ticks()  argument
1129 	ticks = jiffies - ts->idle_jiffies;  in tick_nohz_account_idle_ticks()
1138 static void __tick_nohz_idle_restart_tick(struct tick_sched *ts, ktime_t now)  in __tick_nohz_idle_restart_tick()  argument
1140 	tick_nohz_restart_sched_tick(ts, now);  in __tick_nohz_idle_restart_tick()
1141 	tick_nohz_account_idle_ticks(ts);  in __tick_nohz_idle_restart_tick()
1146 	struct tick_sched *ts = this_cpu_ptr(&tick_cpu_sched);  in tick_nohz_idle_restart_tick()  local
1148 	if (ts->tick_stopped)  in tick_nohz_idle_restart_tick()
1149 		__tick_nohz_idle_restart_tick(ts, ktime_get());  in tick_nohz_idle_restart_tick()
1161 	struct tick_sched *ts = this_cpu_ptr(&tick_cpu_sched);  in tick_nohz_idle_exit()  local
1167 	WARN_ON_ONCE(!ts->inidle);  in tick_nohz_idle_exit()
1168 	WARN_ON_ONCE(ts->timer_expires_base);  in tick_nohz_idle_exit()
1170 	ts->inidle = 0;  in tick_nohz_idle_exit()
1171 	idle_active = ts->idle_active;  in tick_nohz_idle_exit()
1172 	tick_stopped = ts->tick_stopped;  in tick_nohz_idle_exit()
1178 		tick_nohz_stop_idle(ts, now);  in tick_nohz_idle_exit()
1181 		__tick_nohz_idle_restart_tick(ts, now);  in tick_nohz_idle_exit()
1191 	struct tick_sched *ts = this_cpu_ptr(&tick_cpu_sched);  in tick_nohz_handler()  local
1197 	tick_sched_do_timer(ts, now);  in tick_nohz_handler()
1198 	tick_sched_handle(ts, regs);  in tick_nohz_handler()
1201 	if (unlikely(ts->tick_stopped))  in tick_nohz_handler()
1204 	hrtimer_forward(&ts->sched_timer, now, tick_period);  in tick_nohz_handler()
1205 	tick_program_event(hrtimer_get_expires(&ts->sched_timer), 1);  in tick_nohz_handler()
1208 static inline void tick_nohz_activate(struct tick_sched *ts, int mode)  in tick_nohz_activate()  argument
1212 	ts->nohz_mode = mode;  in tick_nohz_activate()
1223 	struct tick_sched *ts = this_cpu_ptr(&tick_cpu_sched);  in tick_nohz_switch_to_nohz()  local
1236 	hrtimer_init(&ts->sched_timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS_HARD);  in tick_nohz_switch_to_nohz()
1240 	hrtimer_set_expires(&ts->sched_timer, next);  in tick_nohz_switch_to_nohz()
1241 	hrtimer_forward_now(&ts->sched_timer, tick_period);  in tick_nohz_switch_to_nohz()
1242 	tick_program_event(hrtimer_get_expires(&ts->sched_timer), 1);  in tick_nohz_switch_to_nohz()
1243 	tick_nohz_activate(ts, NOHZ_MODE_LOWRES);  in tick_nohz_switch_to_nohz()
1248 	struct tick_sched *ts = this_cpu_ptr(&tick_cpu_sched);  in tick_nohz_irq_enter()  local
1251 	if (!ts->idle_active && !ts->tick_stopped)  in tick_nohz_irq_enter()
1254 	if (ts->idle_active)  in tick_nohz_irq_enter()
1255 		tick_nohz_stop_idle(ts, now);  in tick_nohz_irq_enter()
1256 	if (ts->tick_stopped)  in tick_nohz_irq_enter()
1264 static inline void tick_nohz_activate(struct tick_sched *ts, int mode) { }  in tick_nohz_activate()  argument
1287 	struct tick_sched *ts =  in tick_sched_timer()  local
1292 	tick_sched_do_timer(ts, now);  in tick_sched_timer()
1299 		tick_sched_handle(ts, regs);  in tick_sched_timer()
1301 		ts->next_tick = 0;  in tick_sched_timer()
1304 	if (unlikely(ts->tick_stopped))  in tick_sched_timer()
1327 	struct tick_sched *ts = this_cpu_ptr(&tick_cpu_sched);  in tick_setup_sched_timer()  local
1333 	hrtimer_init(&ts->sched_timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS_HARD);  in tick_setup_sched_timer()
1334 	ts->sched_timer.function = tick_sched_timer;  in tick_setup_sched_timer()
1337 	hrtimer_set_expires(&ts->sched_timer, tick_init_jiffy_update());  in tick_setup_sched_timer()
1344 		hrtimer_add_expires_ns(&ts->sched_timer, offset);  in tick_setup_sched_timer()
1347 	hrtimer_forward(&ts->sched_timer, now, tick_period);  in tick_setup_sched_timer()
1348 	hrtimer_start_expires(&ts->sched_timer, HRTIMER_MODE_ABS_PINNED_HARD);  in tick_setup_sched_timer()
1349 	tick_nohz_activate(ts, NOHZ_MODE_HIGHRES);  in tick_setup_sched_timer()
1356 	struct tick_sched *ts = &per_cpu(tick_cpu_sched, cpu);  in tick_cancel_sched_timer()  local
1359 	if (ts->sched_timer.base)  in tick_cancel_sched_timer()
1360 		hrtimer_cancel(&ts->sched_timer);  in tick_cancel_sched_timer()
1363 	memset(ts, 0, sizeof(*ts));  in tick_cancel_sched_timer()
1383 	struct tick_sched *ts = this_cpu_ptr(&tick_cpu_sched);  in tick_oneshot_notify()  local
1385 	set_bit(0, &ts->check_clocks);  in tick_oneshot_notify()
1398 	struct tick_sched *ts = this_cpu_ptr(&tick_cpu_sched);  in tick_check_oneshot_change()  local
1400 	if (!test_and_clear_bit(0, &ts->check_clocks))  in tick_check_oneshot_change()
1403 	if (ts->nohz_mode != NOHZ_MODE_INACTIVE)  in tick_check_oneshot_change()