185 static void tick_sched_do_timer(struct tick_sched *ts, ktime_t now)  in tick_sched_do_timer()  argument
216 	if (ts->last_tick_jiffies != jiffies) {  in tick_sched_do_timer()
217 		ts->stalled_jiffies = 0;  in tick_sched_do_timer()
218 		ts->last_tick_jiffies = READ_ONCE(jiffies);  in tick_sched_do_timer()
220 		if (++ts->stalled_jiffies == MAX_STALLED_JIFFIES) {  in tick_sched_do_timer()
222 			ts->stalled_jiffies = 0;  in tick_sched_do_timer()
223 			ts->last_tick_jiffies = READ_ONCE(jiffies);  in tick_sched_do_timer()
227 	if (ts->inidle)  in tick_sched_do_timer()
228 		ts->got_idle_tick = 1;  in tick_sched_do_timer()
231 static void tick_sched_handle(struct tick_sched *ts, struct pt_regs *regs)  in tick_sched_handle()  argument
242 	if (ts->tick_stopped) {  in tick_sched_handle()
245 			ts->idle_jiffies++;  in tick_sched_handle()
251 		ts->next_tick = 0;  in tick_sched_handle()
303 static bool can_stop_full_tick(int cpu, struct tick_sched *ts)  in can_stop_full_tick()  argument
313 	if (check_tick_dependency(&ts->tick_dep_mask))  in can_stop_full_tick()
447 	struct tick_sched *ts;  in tick_nohz_dep_set_cpu()  local
449 	ts = per_cpu_ptr(&tick_cpu_sched, cpu);  in tick_nohz_dep_set_cpu()
451 	prev = atomic_fetch_or(BIT(bit), &ts->tick_dep_mask);  in tick_nohz_dep_set_cpu()
469 	struct tick_sched *ts = per_cpu_ptr(&tick_cpu_sched, cpu);  in tick_nohz_dep_clear_cpu()  local
471 	atomic_andnot(BIT(bit), &ts->tick_dep_mask);  in tick_nohz_dep_clear_cpu()
524 	struct tick_sched *ts;  in __tick_nohz_task_switch()  local
529 	ts = this_cpu_ptr(&tick_cpu_sched);  in __tick_nohz_task_switch()
531 	if (ts->tick_stopped) {  in __tick_nohz_task_switch()
626 	struct tick_sched *ts = this_cpu_ptr(&tick_cpu_sched);  in tick_nohz_tick_stopped()  local
628 	return ts->tick_stopped;  in tick_nohz_tick_stopped()
633 	struct tick_sched *ts = per_cpu_ptr(&tick_cpu_sched, cpu);  in tick_nohz_tick_stopped_cpu()  local
635 	return ts->tick_stopped;  in tick_nohz_tick_stopped_cpu()
661 static void tick_nohz_stop_idle(struct tick_sched *ts, ktime_t now)  in tick_nohz_stop_idle()  argument
665 	if (WARN_ON_ONCE(!ts->idle_active))  in tick_nohz_stop_idle()
668 	delta = ktime_sub(now, ts->idle_entrytime);  in tick_nohz_stop_idle()
670 	write_seqcount_begin(&ts->idle_sleeptime_seq);  in tick_nohz_stop_idle()
672 		ts->iowait_sleeptime = ktime_add(ts->iowait_sleeptime, delta);  in tick_nohz_stop_idle()
674 		ts->idle_sleeptime = ktime_add(ts->idle_sleeptime, delta);  in tick_nohz_stop_idle()
676 	ts->idle_entrytime = now;  in tick_nohz_stop_idle()
677 	ts->idle_active = 0;  in tick_nohz_stop_idle()
678 	write_seqcount_end(&ts->idle_sleeptime_seq);  in tick_nohz_stop_idle()
683 static void tick_nohz_start_idle(struct tick_sched *ts)  in tick_nohz_start_idle()  argument
685 	write_seqcount_begin(&ts->idle_sleeptime_seq);  in tick_nohz_start_idle()
686 	ts->idle_entrytime = ktime_get();  in tick_nohz_start_idle()
687 	ts->idle_active = 1;  in tick_nohz_start_idle()
688 	write_seqcount_end(&ts->idle_sleeptime_seq);  in tick_nohz_start_idle()
693 static u64 get_cpu_sleep_time_us(struct tick_sched *ts, ktime_t *sleeptime,  in get_cpu_sleep_time_us()  argument
707 		seq = read_seqcount_begin(&ts->idle_sleeptime_seq);  in get_cpu_sleep_time_us()
709 		if (ts->idle_active && compute_delta) {  in get_cpu_sleep_time_us()
710 			ktime_t delta = ktime_sub(now, ts->idle_entrytime);  in get_cpu_sleep_time_us()
716 	} while (read_seqcount_retry(&ts->idle_sleeptime_seq, seq));  in get_cpu_sleep_time_us()
741 	struct tick_sched *ts = &per_cpu(tick_cpu_sched, cpu);  in get_cpu_idle_time_us()  local
743 	return get_cpu_sleep_time_us(ts, &ts->idle_sleeptime,  in get_cpu_idle_time_us()
767 	struct tick_sched *ts = &per_cpu(tick_cpu_sched, cpu);  in get_cpu_iowait_time_us()  local
769 	return get_cpu_sleep_time_us(ts, &ts->iowait_sleeptime,  in get_cpu_iowait_time_us()
774 static void tick_nohz_restart(struct tick_sched *ts, ktime_t now)  in tick_nohz_restart()  argument
776 	hrtimer_cancel(&ts->sched_timer);  in tick_nohz_restart()
777 	hrtimer_set_expires(&ts->sched_timer, ts->last_tick);  in tick_nohz_restart()
780 	hrtimer_forward(&ts->sched_timer, now, TICK_NSEC);  in tick_nohz_restart()
782 	if (ts->nohz_mode == NOHZ_MODE_HIGHRES) {  in tick_nohz_restart()
783 		hrtimer_start_expires(&ts->sched_timer,  in tick_nohz_restart()
786 		tick_program_event(hrtimer_get_expires(&ts->sched_timer), 1);  in tick_nohz_restart()
793 	ts->next_tick = 0;  in tick_nohz_restart()
801 static ktime_t tick_nohz_next_event(struct tick_sched *ts, int cpu)  in tick_nohz_next_event()  argument
813 	ts->last_jiffies = basejiff;  in tick_nohz_next_event()
814 	ts->timer_expires_base = basemono;  in tick_nohz_next_event()
838 		ts->next_timer = next_tick;  in tick_nohz_next_event()
856 		if (!ts->tick_stopped) {  in tick_nohz_next_event()
857 			ts->timer_expires = 0;  in tick_nohz_next_event()
869 	    (tick_do_timer_cpu != TICK_DO_TIMER_NONE || !ts->do_timer_last))  in tick_nohz_next_event()
878 	ts->timer_expires = min_t(u64, expires, next_tick);  in tick_nohz_next_event()
881 	return ts->timer_expires;  in tick_nohz_next_event()
884 static void tick_nohz_stop_tick(struct tick_sched *ts, int cpu)  in tick_nohz_stop_tick()  argument
887 	u64 basemono = ts->timer_expires_base;  in tick_nohz_stop_tick()
888 	u64 expires = ts->timer_expires;  in tick_nohz_stop_tick()
892 	ts->timer_expires_base = 0;  in tick_nohz_stop_tick()
904 		ts->do_timer_last = 1;  in tick_nohz_stop_tick()
906 		ts->do_timer_last = 0;  in tick_nohz_stop_tick()
910 	if (ts->tick_stopped && (expires == ts->next_tick)) {  in tick_nohz_stop_tick()
912 		if (tick == KTIME_MAX || ts->next_tick == hrtimer_get_expires(&ts->sched_timer))  in tick_nohz_stop_tick()
917 			    basemono, ts->next_tick, dev->next_event,  in tick_nohz_stop_tick()
918 			    hrtimer_active(&ts->sched_timer), hrtimer_get_expires(&ts->sched_timer));  in tick_nohz_stop_tick()
928 	if (!ts->tick_stopped) {  in tick_nohz_stop_tick()
932 		ts->last_tick = hrtimer_get_expires(&ts->sched_timer);  in tick_nohz_stop_tick()
933 		ts->tick_stopped = 1;  in tick_nohz_stop_tick()
937 	ts->next_tick = tick;  in tick_nohz_stop_tick()
944 		if (ts->nohz_mode == NOHZ_MODE_HIGHRES)  in tick_nohz_stop_tick()
945 			hrtimer_cancel(&ts->sched_timer);  in tick_nohz_stop_tick()
951 	if (ts->nohz_mode == NOHZ_MODE_HIGHRES) {  in tick_nohz_stop_tick()
952 		hrtimer_start(&ts->sched_timer, tick,  in tick_nohz_stop_tick()
955 		hrtimer_set_expires(&ts->sched_timer, tick);  in tick_nohz_stop_tick()
960 static void tick_nohz_retain_tick(struct tick_sched *ts)  in tick_nohz_retain_tick()  argument
962 	ts->timer_expires_base = 0;  in tick_nohz_retain_tick()
966 static void tick_nohz_stop_sched_tick(struct tick_sched *ts, int cpu)  in tick_nohz_stop_sched_tick()  argument
968 	if (tick_nohz_next_event(ts, cpu))  in tick_nohz_stop_sched_tick()
969 		tick_nohz_stop_tick(ts, cpu);  in tick_nohz_stop_sched_tick()
971 		tick_nohz_retain_tick(ts);  in tick_nohz_stop_sched_tick()
975 static void tick_nohz_restart_sched_tick(struct tick_sched *ts, ktime_t now)  in tick_nohz_restart_sched_tick()  argument
991 	ts->tick_stopped  = 0;  in tick_nohz_restart_sched_tick()
992 	tick_nohz_restart(ts, now);  in tick_nohz_restart_sched_tick()
995 static void __tick_nohz_full_update_tick(struct tick_sched *ts,  in __tick_nohz_full_update_tick()  argument
1001 	if (can_stop_full_tick(cpu, ts))  in __tick_nohz_full_update_tick()
1002 		tick_nohz_stop_sched_tick(ts, cpu);  in __tick_nohz_full_update_tick()
1003 	else if (ts->tick_stopped)  in __tick_nohz_full_update_tick()
1004 		tick_nohz_restart_sched_tick(ts, now);  in __tick_nohz_full_update_tick()
1008 static void tick_nohz_full_update_tick(struct tick_sched *ts)  in tick_nohz_full_update_tick()  argument
1013 	if (!ts->tick_stopped && ts->nohz_mode == NOHZ_MODE_INACTIVE)  in tick_nohz_full_update_tick()
1016 	__tick_nohz_full_update_tick(ts, ktime_get());  in tick_nohz_full_update_tick()
1058 static bool can_stop_idle_tick(int cpu, struct tick_sched *ts)  in can_stop_idle_tick()  argument
1074 		ts->next_tick = 0;  in can_stop_idle_tick()
1078 	if (unlikely(ts->nohz_mode == NOHZ_MODE_INACTIVE))  in can_stop_idle_tick()
1110 	struct tick_sched *ts = this_cpu_ptr(&tick_cpu_sched);  in tick_nohz_idle_stop_tick()  local
1118 	if (ts->timer_expires_base)  in tick_nohz_idle_stop_tick()
1119 		expires = ts->timer_expires;  in tick_nohz_idle_stop_tick()
1120 	else if (can_stop_idle_tick(cpu, ts))  in tick_nohz_idle_stop_tick()
1121 		expires = tick_nohz_next_event(ts, cpu);  in tick_nohz_idle_stop_tick()
1125 	ts->idle_calls++;  in tick_nohz_idle_stop_tick()
1128 		int was_stopped = ts->tick_stopped;  in tick_nohz_idle_stop_tick()
1130 		tick_nohz_stop_tick(ts, cpu);  in tick_nohz_idle_stop_tick()
1132 		ts->idle_sleeps++;  in tick_nohz_idle_stop_tick()
1133 		ts->idle_expires = expires;  in tick_nohz_idle_stop_tick()
1135 		if (!was_stopped && ts->tick_stopped) {  in tick_nohz_idle_stop_tick()
1136 			ts->idle_jiffies = ts->last_jiffies;  in tick_nohz_idle_stop_tick()
1140 		tick_nohz_retain_tick(ts);  in tick_nohz_idle_stop_tick()
1161 	struct tick_sched *ts;  in tick_nohz_idle_enter()  local
1167 	ts = this_cpu_ptr(&tick_cpu_sched);  in tick_nohz_idle_enter()
1169 	WARN_ON_ONCE(ts->timer_expires_base);  in tick_nohz_idle_enter()
1171 	ts->inidle = 1;  in tick_nohz_idle_enter()
1172 	tick_nohz_start_idle(ts);  in tick_nohz_idle_enter()
1187 	struct tick_sched *ts = this_cpu_ptr(&tick_cpu_sched);  in tick_nohz_irq_exit()  local
1189 	if (ts->inidle)  in tick_nohz_irq_exit()
1190 		tick_nohz_start_idle(ts);  in tick_nohz_irq_exit()
1192 		tick_nohz_full_update_tick(ts);  in tick_nohz_irq_exit()
1200 	struct tick_sched *ts = this_cpu_ptr(&tick_cpu_sched);  in tick_nohz_idle_got_tick()  local
1202 	if (ts->got_idle_tick) {  in tick_nohz_idle_got_tick()
1203 		ts->got_idle_tick = 0;  in tick_nohz_idle_got_tick()
1234 	struct tick_sched *ts = this_cpu_ptr(&tick_cpu_sched);  in tick_nohz_get_sleep_length()  local
1240 	ktime_t now = ts->idle_entrytime;  in tick_nohz_get_sleep_length()
1243 	WARN_ON_ONCE(!ts->inidle);  in tick_nohz_get_sleep_length()
1247 	if (!can_stop_idle_tick(cpu, ts))  in tick_nohz_get_sleep_length()
1250 	next_event = tick_nohz_next_event(ts, cpu);  in tick_nohz_get_sleep_length()
1259 			   hrtimer_next_event_without(&ts->sched_timer));  in tick_nohz_get_sleep_length()
1272 	struct tick_sched *ts = tick_get_tick_sched(cpu);  in tick_nohz_get_idle_calls_cpu()  local
1274 	return ts->idle_calls;  in tick_nohz_get_idle_calls_cpu()
1284 	struct tick_sched *ts = this_cpu_ptr(&tick_cpu_sched);  in tick_nohz_get_idle_calls()  local
1286 	return ts->idle_calls;  in tick_nohz_get_idle_calls()
1289 static void tick_nohz_account_idle_time(struct tick_sched *ts,  in tick_nohz_account_idle_time()  argument
1294 	ts->idle_exittime = now;  in tick_nohz_account_idle_time()
1303 	ticks = jiffies - ts->idle_jiffies;  in tick_nohz_account_idle_time()
1313 	struct tick_sched *ts = this_cpu_ptr(&tick_cpu_sched);  in tick_nohz_idle_restart_tick()  local
1315 	if (ts->tick_stopped) {  in tick_nohz_idle_restart_tick()
1317 		tick_nohz_restart_sched_tick(ts, now);  in tick_nohz_idle_restart_tick()
1318 		tick_nohz_account_idle_time(ts, now);  in tick_nohz_idle_restart_tick()
1322 static void tick_nohz_idle_update_tick(struct tick_sched *ts, ktime_t now)  in tick_nohz_idle_update_tick()  argument
1325 		__tick_nohz_full_update_tick(ts, now);  in tick_nohz_idle_update_tick()
1327 		tick_nohz_restart_sched_tick(ts, now);  in tick_nohz_idle_update_tick()
1329 	tick_nohz_account_idle_time(ts, now);  in tick_nohz_idle_update_tick()
1341 	struct tick_sched *ts = this_cpu_ptr(&tick_cpu_sched);  in tick_nohz_idle_exit()  local
1347 	WARN_ON_ONCE(!ts->inidle);  in tick_nohz_idle_exit()
1348 	WARN_ON_ONCE(ts->timer_expires_base);  in tick_nohz_idle_exit()
1350 	ts->inidle = 0;  in tick_nohz_idle_exit()
1351 	idle_active = ts->idle_active;  in tick_nohz_idle_exit()
1352 	tick_stopped = ts->tick_stopped;  in tick_nohz_idle_exit()
1358 		tick_nohz_stop_idle(ts, now);  in tick_nohz_idle_exit()
1361 		tick_nohz_idle_update_tick(ts, now);  in tick_nohz_idle_exit()
1371 	struct tick_sched *ts = this_cpu_ptr(&tick_cpu_sched);  in tick_nohz_handler()  local
1377 	tick_sched_do_timer(ts, now);  in tick_nohz_handler()
1378 	tick_sched_handle(ts, regs);  in tick_nohz_handler()
1380 	if (unlikely(ts->tick_stopped)) {  in tick_nohz_handler()
1390 	hrtimer_forward(&ts->sched_timer, now, TICK_NSEC);  in tick_nohz_handler()
1391 	tick_program_event(hrtimer_get_expires(&ts->sched_timer), 1);  in tick_nohz_handler()
1394 static inline void tick_nohz_activate(struct tick_sched *ts, int mode)  in tick_nohz_activate()  argument
1398 	ts->nohz_mode = mode;  in tick_nohz_activate()
1409 	struct tick_sched *ts = this_cpu_ptr(&tick_cpu_sched);  in tick_nohz_switch_to_nohz()  local
1422 	hrtimer_init(&ts->sched_timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS_HARD);  in tick_nohz_switch_to_nohz()
1426 	hrtimer_set_expires(&ts->sched_timer, next);  in tick_nohz_switch_to_nohz()
1427 	hrtimer_forward_now(&ts->sched_timer, TICK_NSEC);  in tick_nohz_switch_to_nohz()
1428 	tick_program_event(hrtimer_get_expires(&ts->sched_timer), 1);  in tick_nohz_switch_to_nohz()
1429 	tick_nohz_activate(ts, NOHZ_MODE_LOWRES);  in tick_nohz_switch_to_nohz()
1434 	struct tick_sched *ts = this_cpu_ptr(&tick_cpu_sched);  in tick_nohz_irq_enter()  local
1437 	if (!ts->idle_active && !ts->tick_stopped)  in tick_nohz_irq_enter()
1440 	if (ts->idle_active)  in tick_nohz_irq_enter()
1441 		tick_nohz_stop_idle(ts, now);  in tick_nohz_irq_enter()
1449 	if (ts->tick_stopped)  in tick_nohz_irq_enter()
1457 static inline void tick_nohz_activate(struct tick_sched *ts, int mode) { }  in tick_nohz_activate()  argument
1480 	struct tick_sched *ts =  in tick_sched_timer()  local
1485 	tick_sched_do_timer(ts, now);  in tick_sched_timer()
1492 		tick_sched_handle(ts, regs);  in tick_sched_timer()
1494 		ts->next_tick = 0;  in tick_sched_timer()
1497 	if (unlikely(ts->tick_stopped))  in tick_sched_timer()
1520 	struct tick_sched *ts = this_cpu_ptr(&tick_cpu_sched);  in tick_setup_sched_timer()  local
1526 	hrtimer_init(&ts->sched_timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS_HARD);  in tick_setup_sched_timer()
1527 	ts->sched_timer.function = tick_sched_timer;  in tick_setup_sched_timer()
1530 	hrtimer_set_expires(&ts->sched_timer, tick_init_jiffy_update());  in tick_setup_sched_timer()
1537 		hrtimer_add_expires_ns(&ts->sched_timer, offset);  in tick_setup_sched_timer()
1540 	hrtimer_forward(&ts->sched_timer, now, TICK_NSEC);  in tick_setup_sched_timer()
1541 	hrtimer_start_expires(&ts->sched_timer, HRTIMER_MODE_ABS_PINNED_HARD);  in tick_setup_sched_timer()
1542 	tick_nohz_activate(ts, NOHZ_MODE_HIGHRES);  in tick_setup_sched_timer()
1549 	struct tick_sched *ts = &per_cpu(tick_cpu_sched, cpu);  in tick_cancel_sched_timer()  local
1554 	if (ts->sched_timer.base)  in tick_cancel_sched_timer()
1555 		hrtimer_cancel(&ts->sched_timer);  in tick_cancel_sched_timer()
1558 	idle_sleeptime = ts->idle_sleeptime;  in tick_cancel_sched_timer()
1559 	iowait_sleeptime = ts->iowait_sleeptime;  in tick_cancel_sched_timer()
1560 	idle_calls = ts->idle_calls;  in tick_cancel_sched_timer()
1561 	idle_sleeps = ts->idle_sleeps;  in tick_cancel_sched_timer()
1562 	memset(ts, 0, sizeof(*ts));  in tick_cancel_sched_timer()
1563 	ts->idle_sleeptime = idle_sleeptime;  in tick_cancel_sched_timer()
1564 	ts->iowait_sleeptime = iowait_sleeptime;  in tick_cancel_sched_timer()
1565 	ts->idle_calls = idle_calls;  in tick_cancel_sched_timer()
1566 	ts->idle_sleeps = idle_sleeps;  in tick_cancel_sched_timer()
1586 	struct tick_sched *ts = this_cpu_ptr(&tick_cpu_sched);  in tick_oneshot_notify()  local
1588 	set_bit(0, &ts->check_clocks);  in tick_oneshot_notify()
1601 	struct tick_sched *ts = this_cpu_ptr(&tick_cpu_sched);  in tick_check_oneshot_change()  local
1603 	if (!test_and_clear_bit(0, &ts->check_clocks))  in tick_check_oneshot_change()
1606 	if (ts->nohz_mode != NOHZ_MODE_INACTIVE)  in tick_check_oneshot_change()