Lines Matching +full:next +full:- +full:mode
1 // SPDX-License-Identifier: GPL-2.0
3 * Copyright(C) 2005-2006, Thomas Gleixner <tglx@linutronix.de>
4 * Copyright(C) 2005-2007, Red Hat, Inc., Ingo Molnar
5 * Copyright(C) 2006-2007 Timesys Corp., Thomas Gleixner
7 * High-resolution kernel timers
9 * In contrast to the low-resolution timeout API, aka timer wheel,
50 #include "tick-internal.h"
54 * cpu_base->active
57 #define HRTIMER_ACTIVE_HARD ((1U << MASK_SHIFT) - 1)
119 [0 ... MAX_CLOCKS - 1] = HRTIMER_MAX_CLOCK_BASES,
136 * timer->base->cpu_base
155 * means that all timers which are tied to this base via timer->base are
162 * possible to set timer->base = &migration_base and drop the lock: the timer
168 __acquires(&timer->base->lock) in lock_hrtimer_base()
173 base = READ_ONCE(timer->base); in lock_hrtimer_base()
175 raw_spin_lock_irqsave(&base->cpu_base->lock, *flags); in lock_hrtimer_base()
176 if (likely(base == timer->base)) in lock_hrtimer_base()
179 raw_spin_unlock_irqrestore(&base->cpu_base->lock, *flags); in lock_hrtimer_base()
186 * We do not migrate the timer when it is expiring before the next
192 * Called with cpu_base->lock of target cpu held.
199 expires = ktime_sub(hrtimer_get_expires(timer), new_base->offset); in hrtimer_check_target()
200 return expires < new_base->cpu_base->expires_next; in hrtimer_check_target()
215 * We switch the timer base to a power-optimized selected CPU target,
217 * - NO_HZ_COMMON is enabled
218 * - timer migration is enabled
219 * - the timer callback is not running
220 * - the timer is not the first expiring timer on the new target
232 int basenum = base->index; in switch_hrtimer_base()
237 new_base = &new_cpu_base->clock_base[basenum]; in switch_hrtimer_base()
253 WRITE_ONCE(timer->base, &migration_base); in switch_hrtimer_base()
254 raw_spin_unlock(&base->cpu_base->lock); in switch_hrtimer_base()
255 raw_spin_lock(&new_base->cpu_base->lock); in switch_hrtimer_base()
259 raw_spin_unlock(&new_base->cpu_base->lock); in switch_hrtimer_base()
260 raw_spin_lock(&base->cpu_base->lock); in switch_hrtimer_base()
262 WRITE_ONCE(timer->base, base); in switch_hrtimer_base()
265 WRITE_ONCE(timer->base, new_base); in switch_hrtimer_base()
285 __acquires(&timer->base->cpu_base->lock) in lock_hrtimer_base()
287 struct hrtimer_clock_base *base = timer->base; in lock_hrtimer_base()
289 raw_spin_lock_irqsave(&base->cpu_base->lock, *flags); in lock_hrtimer_base()
313 tmp = dclc < 0 ? -dclc : dclc; in __ktime_divns()
322 return dclc < 0 ? -tmp : tmp; in __ktime_divns()
352 return ((struct hrtimer *) addr)->function; in hrtimer_debug_hint()
357 * - an active object is initialized
375 * - an active object is activated
376 * - an unknown non-static object is activated
391 * - an active object is freed
426 enum hrtimer_mode mode) in debug_hrtimer_activate() argument
447 enum hrtimer_mode mode) { } in debug_hrtimer_activate() argument
453 enum hrtimer_mode mode) in debug_init() argument
456 trace_hrtimer_init(timer, clockid, mode); in debug_init()
460 enum hrtimer_mode mode) in debug_init_on_stack() argument
463 trace_hrtimer_init(timer, clockid, mode); in debug_init_on_stack()
467 enum hrtimer_mode mode) in debug_activate() argument
469 debug_hrtimer_activate(timer, mode); in debug_activate()
470 trace_hrtimer_start(timer, mode); in debug_activate()
490 return &cpu_base->clock_base[idx]; in __next_base()
505 struct timerqueue_node *next; in __hrtimer_next_event_base() local
508 next = timerqueue_getnext(&base->active); in __hrtimer_next_event_base()
509 timer = container_of(next, struct hrtimer, node); in __hrtimer_next_event_base()
511 /* Get to the next timer in the queue. */ in __hrtimer_next_event_base()
512 next = timerqueue_iterate_next(next); in __hrtimer_next_event_base()
513 if (!next) in __hrtimer_next_event_base()
516 timer = container_of(next, struct hrtimer, node); in __hrtimer_next_event_base()
518 expires = ktime_sub(hrtimer_get_expires(timer), base->offset); in __hrtimer_next_event_base()
526 if (timer->is_soft) in __hrtimer_next_event_base()
527 cpu_base->softirq_next_timer = timer; in __hrtimer_next_event_base()
529 cpu_base->next_timer = timer; in __hrtimer_next_event_base()
533 * clock_was_set() might have changed base->offset of any of in __hrtimer_next_event_base()
551 * hrtimer_run_softirq(), hrtimer_update_softirq_timer() will re-add these bases.
558 * - HRTIMER_ACTIVE_ALL,
559 * - HRTIMER_ACTIVE_SOFT, or
560 * - HRTIMER_ACTIVE_HARD.
569 if (!cpu_base->softirq_activated && (active_mask & HRTIMER_ACTIVE_SOFT)) { in __hrtimer_get_next_event()
570 active = cpu_base->active_bases & HRTIMER_ACTIVE_SOFT; in __hrtimer_get_next_event()
571 cpu_base->softirq_next_timer = NULL; in __hrtimer_get_next_event()
575 next_timer = cpu_base->softirq_next_timer; in __hrtimer_get_next_event()
579 active = cpu_base->active_bases & HRTIMER_ACTIVE_HARD; in __hrtimer_get_next_event()
580 cpu_base->next_timer = next_timer; in __hrtimer_get_next_event()
597 if (!cpu_base->softirq_activated) { in hrtimer_update_next_event()
603 cpu_base->softirq_expires_next = soft; in hrtimer_update_next_event()
608 * If a softirq timer is expiring first, update cpu_base->next_timer in hrtimer_update_next_event()
612 cpu_base->next_timer = cpu_base->softirq_next_timer; in hrtimer_update_next_event()
621 ktime_t *offs_real = &base->clock_base[HRTIMER_BASE_REALTIME].offset; in hrtimer_update_base()
622 ktime_t *offs_boot = &base->clock_base[HRTIMER_BASE_BOOTTIME].offset; in hrtimer_update_base()
623 ktime_t *offs_tai = &base->clock_base[HRTIMER_BASE_TAI].offset; in hrtimer_update_base()
625 ktime_t now = ktime_get_update_offsets_now(&base->clock_was_set_seq, in hrtimer_update_base()
628 base->clock_base[HRTIMER_BASE_REALTIME_SOFT].offset = *offs_real; in hrtimer_update_base()
629 base->clock_base[HRTIMER_BASE_BOOTTIME_SOFT].offset = *offs_boot; in hrtimer_update_base()
630 base->clock_base[HRTIMER_BASE_TAI_SOFT].offset = *offs_tai; in hrtimer_update_base()
636 * Is the high resolution mode active ?
641 cpu_base->hres_active : 0; in hrtimer_hres_active()
648 cpu_base->expires_next = expires_next; in __hrtimer_reprogram()
667 if (!hrtimer_hres_active(cpu_base) || cpu_base->hang_detected) in __hrtimer_reprogram()
675 * next event
676 * Called with interrupts disabled and base->lock held
685 if (skip_equal && expires_next == cpu_base->expires_next) in hrtimer_force_reprogram()
688 __hrtimer_reprogram(cpu_base, cpu_base->next_timer, expires_next); in hrtimer_force_reprogram()
702 * Enable / Disable high resolution mode
712 * hrtimer_high_res_enabled - query, if the highres mode is enabled
722 * Switch to high resolution mode
729 pr_warn("Could not switch to high resolution mode on CPU %u\n", in hrtimer_switch_to_hres()
730 base->cpu); in hrtimer_switch_to_hres()
733 base->hres_active = 1; in hrtimer_switch_to_hres()
748 * Retrigger next event is called after clock was set with interrupts
753 * - CONFIG_HIGH_RES_TIMERS is enabled.
754 * - CONFIG_NOHZ_COMMON is enabled
765 * When high resolution mode or nohz is active, then the offsets of in retrigger_next_event()
767 * next tick will take care of that. in retrigger_next_event()
769 * If high resolution mode is active then the next expiring timer in retrigger_next_event()
774 * of the next expiring timer is enough. The return from the SMP in retrigger_next_event()
781 raw_spin_lock(&base->lock); in retrigger_next_event()
787 raw_spin_unlock(&base->lock); in retrigger_next_event()
795 * Called with interrupts disabled and base->cpu_base.lock held
800 struct hrtimer_clock_base *base = timer->base; in hrtimer_reprogram()
801 ktime_t expires = ktime_sub(hrtimer_get_expires(timer), base->offset); in hrtimer_reprogram()
807 * expiry time which is less than base->offset. Set it to 0. in hrtimer_reprogram()
812 if (timer->is_soft) { in hrtimer_reprogram()
817 * first hard hrtimer on the remote CPU - in hrtimer_reprogram()
820 struct hrtimer_cpu_base *timer_cpu_base = base->cpu_base; in hrtimer_reprogram()
822 if (timer_cpu_base->softirq_activated) in hrtimer_reprogram()
825 if (!ktime_before(expires, timer_cpu_base->softirq_expires_next)) in hrtimer_reprogram()
828 timer_cpu_base->softirq_next_timer = timer; in hrtimer_reprogram()
829 timer_cpu_base->softirq_expires_next = expires; in hrtimer_reprogram()
831 if (!ktime_before(expires, timer_cpu_base->expires_next) || in hrtimer_reprogram()
840 if (base->cpu_base != cpu_base) in hrtimer_reprogram()
843 if (expires >= cpu_base->expires_next) in hrtimer_reprogram()
850 if (cpu_base->in_hrtirq) in hrtimer_reprogram()
853 cpu_base->next_timer = timer; in hrtimer_reprogram()
873 * the next expiring timer. in update_needs_ipi()
875 seq = cpu_base->clock_was_set_seq; in update_needs_ipi()
882 if (seq == cpu_base->clock_was_set_seq) in update_needs_ipi()
890 if (cpu_base->in_hrtirq) in update_needs_ipi()
899 active &= cpu_base->active_bases; in update_needs_ipi()
902 struct timerqueue_node *next; in update_needs_ipi() local
904 next = timerqueue_getnext(&base->active); in update_needs_ipi()
905 expires = ktime_sub(next->expires, base->offset); in update_needs_ipi()
906 if (expires < cpu_base->expires_next) in update_needs_ipi()
910 if (base->clockid < HRTIMER_BASE_MONOTONIC_SOFT) in update_needs_ipi()
912 if (cpu_base->softirq_activated) in update_needs_ipi()
914 if (expires < cpu_base->softirq_expires_next) in update_needs_ipi()
930 * system is in !HIGH_RES and NOHZ mode. The NOHZ mode updates the offsets
954 raw_spin_lock_irqsave(&cpu_base->lock, flags); in clock_was_set()
959 raw_spin_unlock_irqrestore(&cpu_base->lock, flags); in clock_was_set()
1005 __releases(&timer->base->cpu_base->lock) in unlock_hrtimer_base()
1007 raw_spin_unlock_irqrestore(&timer->base->cpu_base->lock, *flags); in unlock_hrtimer_base()
1011 * hrtimer_forward() - forward the timer expiry
1039 if (WARN_ON(timer->state & HRTIMER_STATE_ENQUEUED)) in hrtimer_forward()
1065 * enqueue_hrtimer - internal function to (re)start a timer
1074 enum hrtimer_mode mode) in enqueue_hrtimer() argument
1076 debug_activate(timer, mode); in enqueue_hrtimer()
1077 WARN_ON_ONCE(!base->cpu_base->online); in enqueue_hrtimer()
1079 base->cpu_base->active_bases |= 1 << base->index; in enqueue_hrtimer()
1082 WRITE_ONCE(timer->state, HRTIMER_STATE_ENQUEUED); in enqueue_hrtimer()
1084 return timerqueue_add(&base->active, &timer->node); in enqueue_hrtimer()
1088 * __remove_hrtimer - internal function to remove a timer
1092 * High resolution timer mode reprograms the clock event device when the
1093 * timer is the one which expires next. The caller can disable this by setting
1101 struct hrtimer_cpu_base *cpu_base = base->cpu_base; in __remove_hrtimer()
1102 u8 state = timer->state; in __remove_hrtimer()
1105 WRITE_ONCE(timer->state, newstate); in __remove_hrtimer()
1109 if (!timerqueue_del(&base->active, &timer->node)) in __remove_hrtimer()
1110 cpu_base->active_bases &= ~(1 << base->index); in __remove_hrtimer()
1114 * cpu_base->next_timer. This happens when we remove the first in __remove_hrtimer()
1116 * cpu_base->next_timer. So the worst thing what can happen is in __remove_hrtimer()
1120 if (reprogram && timer == cpu_base->next_timer) in __remove_hrtimer()
1131 u8 state = timer->state; in remove_hrtimer()
1138 * resolution mode is active and the timer is on the current in remove_hrtimer()
1145 reprogram = base->cpu_base == this_cpu_ptr(&hrtimer_bases); in remove_hrtimer()
1165 const enum hrtimer_mode mode) in hrtimer_update_lowres() argument
1173 timer->is_rel = mode & HRTIMER_MODE_REL; in hrtimer_update_lowres()
1174 if (timer->is_rel) in hrtimer_update_lowres()
1186 * Find the next SOFT expiration. in hrtimer_update_softirq_timer()
1191 * reprogramming needs to be triggered, even if the next soft in hrtimer_update_softirq_timer()
1192 * hrtimer expires at the same time than the next hard in hrtimer_update_softirq_timer()
1193 * hrtimer. cpu_base->softirq_expires_next needs to be updated! in hrtimer_update_softirq_timer()
1199 * cpu_base->*next_timer is recomputed by __hrtimer_get_next_event() in hrtimer_update_softirq_timer()
1200 * cpu_base->*expires_next is only set by hrtimer_reprogram() in hrtimer_update_softirq_timer()
1202 hrtimer_reprogram(cpu_base->softirq_next_timer, reprogram); in hrtimer_update_softirq_timer()
1206 u64 delta_ns, const enum hrtimer_mode mode, in __hrtimer_start_range_ns() argument
1220 force_local = base->cpu_base == this_cpu_ptr(&hrtimer_bases); in __hrtimer_start_range_ns()
1221 force_local &= base->cpu_base->next_timer == timer; in __hrtimer_start_range_ns()
1236 if (mode & HRTIMER_MODE_REL) in __hrtimer_start_range_ns()
1237 tim = ktime_add_safe(tim, base->get_time()); in __hrtimer_start_range_ns()
1239 tim = hrtimer_update_lowres(timer, tim, mode); in __hrtimer_start_range_ns()
1246 mode & HRTIMER_MODE_PINNED); in __hrtimer_start_range_ns()
1251 first = enqueue_hrtimer(timer, new_base, mode); in __hrtimer_start_range_ns()
1260 hrtimer_force_reprogram(new_base->cpu_base, 1); in __hrtimer_start_range_ns()
1265 * hrtimer_start_range_ns - (re)start an hrtimer
1269 * @mode: timer mode: absolute (HRTIMER_MODE_ABS) or
1271 * softirq based mode is considered for debug purpose only!
1274 u64 delta_ns, const enum hrtimer_mode mode) in hrtimer_start_range_ns() argument
1279 if (WARN_ON_ONCE(!timer->function)) in hrtimer_start_range_ns()
1284 * expiry mode because unmarked timers are moved to softirq expiry. in hrtimer_start_range_ns()
1287 WARN_ON_ONCE(!(mode & HRTIMER_MODE_SOFT) ^ !timer->is_soft); in hrtimer_start_range_ns()
1289 WARN_ON_ONCE(!(mode & HRTIMER_MODE_HARD) ^ !timer->is_hard); in hrtimer_start_range_ns()
1293 if (__hrtimer_start_range_ns(timer, tim, delta_ns, mode, base)) in hrtimer_start_range_ns()
1301 * hrtimer_try_to_cancel - try to deactivate a timer
1308 * * -1 when the timer is currently executing the callback function and
1315 int ret = -1; in hrtimer_try_to_cancel()
1341 spin_lock_init(&base->softirq_expiry_lock); in hrtimer_cpu_base_init_expiry_lock()
1345 __acquires(&base->softirq_expiry_lock) in hrtimer_cpu_base_lock_expiry()
1347 spin_lock(&base->softirq_expiry_lock); in hrtimer_cpu_base_lock_expiry()
1351 __releases(&base->softirq_expiry_lock) in hrtimer_cpu_base_unlock_expiry()
1353 spin_unlock(&base->softirq_expiry_lock); in hrtimer_cpu_base_unlock_expiry()
1359 * If there is a waiter for cpu_base->expiry_lock, then it was waiting for
1366 if (atomic_read(&cpu_base->timer_waiters)) { in hrtimer_sync_wait_running()
1367 raw_spin_unlock_irqrestore(&cpu_base->lock, flags); in hrtimer_sync_wait_running()
1368 spin_unlock(&cpu_base->softirq_expiry_lock); in hrtimer_sync_wait_running()
1369 spin_lock(&cpu_base->softirq_expiry_lock); in hrtimer_sync_wait_running()
1370 raw_spin_lock_irq(&cpu_base->lock); in hrtimer_sync_wait_running()
1383 * - If the caller is on a remote CPU then it has to spin wait for the timer
1386 * - If the caller originates from the task which preempted the timer
1393 struct hrtimer_clock_base *base = READ_ONCE(timer->base); in hrtimer_cancel_wait_running()
1399 if (!timer->is_soft || is_migration_base(base)) { in hrtimer_cancel_wait_running()
1407 * immediately so the softirq can expire the next timer. In theory in hrtimer_cancel_wait_running()
1411 atomic_inc(&base->cpu_base->timer_waiters); in hrtimer_cancel_wait_running()
1412 spin_lock_bh(&base->cpu_base->softirq_expiry_lock); in hrtimer_cancel_wait_running()
1413 atomic_dec(&base->cpu_base->timer_waiters); in hrtimer_cancel_wait_running()
1414 spin_unlock_bh(&base->cpu_base->softirq_expiry_lock); in hrtimer_cancel_wait_running()
1428 * hrtimer_cancel - cancel a timer and wait for the handler to finish.
1450 * __hrtimer_get_remaining - get remaining time for the timer
1472 * hrtimer_get_next_event - get the time until next expiry event
1474 * Returns the next expiry time or KTIME_MAX if no timer is pending.
1482 raw_spin_lock_irqsave(&cpu_base->lock, flags); in hrtimer_get_next_event()
1487 raw_spin_unlock_irqrestore(&cpu_base->lock, flags); in hrtimer_get_next_event()
1493 * hrtimer_next_event_without - time until next expiry event w/o one timer
1496 * Returns the next expiry time over all timers except for the @exclude one or
1505 raw_spin_lock_irqsave(&cpu_base->lock, flags); in hrtimer_next_event_without()
1510 if (!cpu_base->softirq_activated) { in hrtimer_next_event_without()
1511 active = cpu_base->active_bases & HRTIMER_ACTIVE_SOFT; in hrtimer_next_event_without()
1515 active = cpu_base->active_bases & HRTIMER_ACTIVE_HARD; in hrtimer_next_event_without()
1520 raw_spin_unlock_irqrestore(&cpu_base->lock, flags); in hrtimer_next_event_without()
1544 enum hrtimer_mode mode) in __hrtimer_init() argument
1546 bool softtimer = !!(mode & HRTIMER_MODE_SOFT); in __hrtimer_init()
1552 * marked for hard interrupt expiry mode are moved into soft in __hrtimer_init()
1556 if (IS_ENABLED(CONFIG_PREEMPT_RT) && !(mode & HRTIMER_MODE_HARD)) in __hrtimer_init()
1568 if (clock_id == CLOCK_REALTIME && mode & HRTIMER_MODE_REL) in __hrtimer_init()
1573 timer->is_soft = softtimer; in __hrtimer_init()
1574 timer->is_hard = !!(mode & HRTIMER_MODE_HARD); in __hrtimer_init()
1575 timer->base = &cpu_base->clock_base[base]; in __hrtimer_init()
1576 timerqueue_init(&timer->node); in __hrtimer_init()
1581 clockid_t clock_id, enum hrtimer_mode mode) in __hrtimer_setup() argument
1583 __hrtimer_init(timer, clock_id, mode); in __hrtimer_setup()
1586 timer->function = hrtimer_dummy_timeout; in __hrtimer_setup()
1588 timer->function = function; in __hrtimer_setup()
1592 * hrtimer_init - initialize a timer to the given clock
1595 * @mode: The modes which are relevant for initialization:
1604 enum hrtimer_mode mode) in hrtimer_init() argument
1606 debug_init(timer, clock_id, mode); in hrtimer_init()
1607 __hrtimer_init(timer, clock_id, mode); in hrtimer_init()
1612 * hrtimer_setup - initialize a timer to the given clock
1616 * @mode: The modes which are relevant for initialization:
1625 clockid_t clock_id, enum hrtimer_mode mode) in hrtimer_setup() argument
1627 debug_init(timer, clock_id, mode); in hrtimer_setup()
1628 __hrtimer_setup(timer, function, clock_id, mode); in hrtimer_setup()
1633 * hrtimer_setup_on_stack - initialize a timer on stack memory
1637 * @mode: The timer mode
1644 clockid_t clock_id, enum hrtimer_mode mode) in hrtimer_setup_on_stack() argument
1646 debug_init_on_stack(timer, clock_id, mode); in hrtimer_setup_on_stack()
1647 __hrtimer_setup(timer, function, clock_id, mode); in hrtimer_setup_on_stack()
1664 base = READ_ONCE(timer->base); in hrtimer_active()
1665 seq = raw_read_seqcount_begin(&base->seq); in hrtimer_active()
1667 if (timer->state != HRTIMER_STATE_INACTIVE || in hrtimer_active()
1668 base->running == timer) in hrtimer_active()
1671 } while (read_seqcount_retry(&base->seq, seq) || in hrtimer_active()
1672 base != READ_ONCE(timer->base)); in hrtimer_active()
1682 * - queued: the timer is queued
1683 * - callback: the timer is being ran
1684 * - post: the timer is inactive or (re)queued
1686 * On the read side we ensure we observe timer->state and cpu_base->running
1688 * This includes timer->base changing because sequence numbers alone are
1699 unsigned long flags) __must_hold(&cpu_base->lock) in __run_hrtimer()
1705 lockdep_assert_held(&cpu_base->lock); in __run_hrtimer()
1708 base->running = timer; in __run_hrtimer()
1711 * Separate the ->running assignment from the ->state assignment. in __run_hrtimer()
1714 * hrtimer_active() cannot observe base->running == NULL && in __run_hrtimer()
1715 * timer->state == INACTIVE. in __run_hrtimer()
1717 raw_write_seqcount_barrier(&base->seq); in __run_hrtimer()
1720 fn = timer->function; in __run_hrtimer()
1728 timer->is_rel = false; in __run_hrtimer()
1735 raw_spin_unlock_irqrestore(&cpu_base->lock, flags); in __run_hrtimer()
1743 raw_spin_lock_irq(&cpu_base->lock); in __run_hrtimer()
1750 * Note: Because we dropped the cpu_base->lock above, in __run_hrtimer()
1755 !(timer->state & HRTIMER_STATE_ENQUEUED)) in __run_hrtimer()
1759 * Separate the ->running assignment from the ->state assignment. in __run_hrtimer()
1762 * hrtimer_active() cannot observe base->running.timer == NULL && in __run_hrtimer()
1763 * timer->state == INACTIVE. in __run_hrtimer()
1765 raw_write_seqcount_barrier(&base->seq); in __run_hrtimer()
1767 WARN_ON_ONCE(base->running != timer); in __run_hrtimer()
1768 base->running = NULL; in __run_hrtimer()
1775 unsigned int active = cpu_base->active_bases & active_mask; in __hrtimer_run_queues()
1781 basenow = ktime_add(now, base->offset); in __hrtimer_run_queues()
1783 while ((node = timerqueue_getnext(&base->active))) { in __hrtimer_run_queues()
1797 * are right-of a not yet expired timer, because that in __hrtimer_run_queues()
1817 raw_spin_lock_irqsave(&cpu_base->lock, flags); in hrtimer_run_softirq()
1822 cpu_base->softirq_activated = 0; in hrtimer_run_softirq()
1825 raw_spin_unlock_irqrestore(&cpu_base->lock, flags); in hrtimer_run_softirq()
1842 BUG_ON(!cpu_base->hres_active); in hrtimer_interrupt()
1843 cpu_base->nr_events++; in hrtimer_interrupt()
1844 dev->next_event = KTIME_MAX; in hrtimer_interrupt()
1846 raw_spin_lock_irqsave(&cpu_base->lock, flags); in hrtimer_interrupt()
1849 cpu_base->in_hrtirq = 1; in hrtimer_interrupt()
1851 * We set expires_next to KTIME_MAX here with cpu_base->lock in hrtimer_interrupt()
1857 cpu_base->expires_next = KTIME_MAX; in hrtimer_interrupt()
1859 if (!ktime_before(now, cpu_base->softirq_expires_next)) { in hrtimer_interrupt()
1860 cpu_base->softirq_expires_next = KTIME_MAX; in hrtimer_interrupt()
1861 cpu_base->softirq_activated = 1; in hrtimer_interrupt()
1867 /* Reevaluate the clock bases for the [soft] next expiry */ in hrtimer_interrupt()
1873 cpu_base->expires_next = expires_next; in hrtimer_interrupt()
1874 cpu_base->in_hrtirq = 0; in hrtimer_interrupt()
1875 raw_spin_unlock_irqrestore(&cpu_base->lock, flags); in hrtimer_interrupt()
1879 cpu_base->hang_detected = 0; in hrtimer_interrupt()
1884 * The next timer was already expired due to: in hrtimer_interrupt()
1885 * - tracing in hrtimer_interrupt()
1886 * - long lasting callbacks in hrtimer_interrupt()
1887 * - being scheduled away when running in a VM in hrtimer_interrupt()
1896 raw_spin_lock_irqsave(&cpu_base->lock, flags); in hrtimer_interrupt()
1898 cpu_base->nr_retries++; in hrtimer_interrupt()
1904 * we spent here. We schedule the next event this amount of in hrtimer_interrupt()
1907 cpu_base->nr_hangs++; in hrtimer_interrupt()
1908 cpu_base->hang_detected = 1; in hrtimer_interrupt()
1909 raw_spin_unlock_irqrestore(&cpu_base->lock, flags); in hrtimer_interrupt()
1912 if ((unsigned int)delta > cpu_base->max_hang_time) in hrtimer_interrupt()
1913 cpu_base->max_hang_time = (unsigned int) delta; in hrtimer_interrupt()
1941 * can switch to highres and / or nohz mode. The clocksource in hrtimer_run_queues()
1951 raw_spin_lock_irqsave(&cpu_base->lock, flags); in hrtimer_run_queues()
1954 if (!ktime_before(now, cpu_base->softirq_expires_next)) { in hrtimer_run_queues()
1955 cpu_base->softirq_expires_next = KTIME_MAX; in hrtimer_run_queues()
1956 cpu_base->softirq_activated = 1; in hrtimer_run_queues()
1961 raw_spin_unlock_irqrestore(&cpu_base->lock, flags); in hrtimer_run_queues()
1971 struct task_struct *task = t->task; in hrtimer_wakeup()
1973 t->task = NULL; in hrtimer_wakeup()
1981 * hrtimer_sleeper_start_expires - Start a hrtimer sleeper timer
1983 * @mode: timer mode abs/rel
1986 * to allow PREEMPT_RT to tweak the delivery mode (soft/hardirq context)
1989 enum hrtimer_mode mode) in hrtimer_sleeper_start_expires() argument
1992 * Make the enqueue delivery mode check work on RT. If the sleeper in hrtimer_sleeper_start_expires()
1993 * was initialized for hard interrupt delivery, force the mode bit. in hrtimer_sleeper_start_expires()
1995 * __hrtimer_init_sleeper() determines the delivery mode on RT so the in hrtimer_sleeper_start_expires()
1998 if (IS_ENABLED(CONFIG_PREEMPT_RT) && sl->timer.is_hard) in hrtimer_sleeper_start_expires()
1999 mode |= HRTIMER_MODE_HARD; in hrtimer_sleeper_start_expires()
2001 hrtimer_start_expires(&sl->timer, mode); in hrtimer_sleeper_start_expires()
2006 clockid_t clock_id, enum hrtimer_mode mode) in __hrtimer_init_sleeper() argument
2010 * marked for hard interrupt expiry mode are moved into soft in __hrtimer_init_sleeper()
2022 * OTOH, privileged real-time user space applications rely on the in __hrtimer_init_sleeper()
2024 * a real-time scheduling class, mark the mode for hard interrupt in __hrtimer_init_sleeper()
2028 if (rt_or_dl_task_policy(current) && !(mode & HRTIMER_MODE_SOFT)) in __hrtimer_init_sleeper()
2029 mode |= HRTIMER_MODE_HARD; in __hrtimer_init_sleeper()
2032 __hrtimer_init(&sl->timer, clock_id, mode); in __hrtimer_init_sleeper()
2033 sl->timer.function = hrtimer_wakeup; in __hrtimer_init_sleeper()
2034 sl->task = current; in __hrtimer_init_sleeper()
2038 * hrtimer_setup_sleeper_on_stack - initialize a sleeper in stack memory
2041 * @mode: timer mode abs/rel
2044 clockid_t clock_id, enum hrtimer_mode mode) in hrtimer_setup_sleeper_on_stack() argument
2046 debug_init_on_stack(&sl->timer, clock_id, mode); in hrtimer_setup_sleeper_on_stack()
2047 __hrtimer_init_sleeper(sl, clock_id, mode); in hrtimer_setup_sleeper_on_stack()
2053 switch(restart->nanosleep.type) { in nanosleep_copyout()
2056 if (put_old_timespec32(ts, restart->nanosleep.compat_rmtp)) in nanosleep_copyout()
2057 return -EFAULT; in nanosleep_copyout()
2061 if (put_timespec64(ts, restart->nanosleep.rmtp)) in nanosleep_copyout()
2062 return -EFAULT; in nanosleep_copyout()
2067 return -ERESTART_RESTARTBLOCK; in nanosleep_copyout()
2070 static int __sched do_nanosleep(struct hrtimer_sleeper *t, enum hrtimer_mode mode) in do_nanosleep() argument
2076 hrtimer_sleeper_start_expires(t, mode); in do_nanosleep()
2078 if (likely(t->task)) in do_nanosleep()
2081 hrtimer_cancel(&t->timer); in do_nanosleep()
2082 mode = HRTIMER_MODE_ABS; in do_nanosleep()
2084 } while (t->task && !signal_pending(current)); in do_nanosleep()
2088 if (!t->task) in do_nanosleep()
2091 restart = ¤t->restart_block; in do_nanosleep()
2092 if (restart->nanosleep.type != TT_NONE) { in do_nanosleep()
2093 ktime_t rem = hrtimer_expires_remaining(&t->timer); in do_nanosleep()
2102 return -ERESTART_RESTARTBLOCK; in do_nanosleep()
2110 hrtimer_setup_sleeper_on_stack(&t, restart->nanosleep.clockid, HRTIMER_MODE_ABS); in hrtimer_nanosleep_restart()
2111 hrtimer_set_expires_tv64(&t.timer, restart->nanosleep.expires); in hrtimer_nanosleep_restart()
2117 long hrtimer_nanosleep(ktime_t rqtp, const enum hrtimer_mode mode, in hrtimer_nanosleep() argument
2124 hrtimer_setup_sleeper_on_stack(&t, clockid, mode); in hrtimer_nanosleep()
2125 hrtimer_set_expires_range_ns(&t.timer, rqtp, current->timer_slack_ns); in hrtimer_nanosleep()
2126 ret = do_nanosleep(&t, mode); in hrtimer_nanosleep()
2127 if (ret != -ERESTART_RESTARTBLOCK) in hrtimer_nanosleep()
2131 if (mode == HRTIMER_MODE_ABS) { in hrtimer_nanosleep()
2132 ret = -ERESTARTNOHAND; in hrtimer_nanosleep()
2136 restart = ¤t->restart_block; in hrtimer_nanosleep()
2137 restart->nanosleep.clockid = t.timer.base->clockid; in hrtimer_nanosleep()
2138 restart->nanosleep.expires = hrtimer_get_expires_tv64(&t.timer); in hrtimer_nanosleep()
2153 return -EFAULT; in SYSCALL_DEFINE2()
2156 return -EINVAL; in SYSCALL_DEFINE2()
2158 current->restart_block.fn = do_no_restart_syscall; in SYSCALL_DEFINE2()
2159 current->restart_block.nanosleep.type = rmtp ? TT_NATIVE : TT_NONE; in SYSCALL_DEFINE2()
2160 current->restart_block.nanosleep.rmtp = rmtp; in SYSCALL_DEFINE2()
2175 return -EFAULT; in SYSCALL_DEFINE2()
2178 return -EINVAL; in SYSCALL_DEFINE2()
2180 current->restart_block.fn = do_no_restart_syscall; in SYSCALL_DEFINE2()
2181 current->restart_block.nanosleep.type = rmtp ? TT_COMPAT : TT_NONE; in SYSCALL_DEFINE2()
2182 current->restart_block.nanosleep.compat_rmtp = rmtp; in SYSCALL_DEFINE2()
2189 * Functions related to boot-time initialization:
2197 struct hrtimer_clock_base *clock_b = &cpu_base->clock_base[i]; in hrtimers_prepare_cpu()
2199 clock_b->cpu_base = cpu_base; in hrtimers_prepare_cpu()
2200 seqcount_raw_spinlock_init(&clock_b->seq, &cpu_base->lock); in hrtimers_prepare_cpu()
2201 timerqueue_init_head(&clock_b->active); in hrtimers_prepare_cpu()
2204 cpu_base->cpu = cpu; in hrtimers_prepare_cpu()
2205 cpu_base->active_bases = 0; in hrtimers_prepare_cpu()
2206 cpu_base->hres_active = 0; in hrtimers_prepare_cpu()
2207 cpu_base->hang_detected = 0; in hrtimers_prepare_cpu()
2208 cpu_base->next_timer = NULL; in hrtimers_prepare_cpu()
2209 cpu_base->softirq_next_timer = NULL; in hrtimers_prepare_cpu()
2210 cpu_base->expires_next = KTIME_MAX; in hrtimers_prepare_cpu()
2211 cpu_base->softirq_expires_next = KTIME_MAX; in hrtimers_prepare_cpu()
2212 cpu_base->online = 1; in hrtimers_prepare_cpu()
2225 while ((node = timerqueue_getnext(&old_base->active))) { in migrate_hrtimer_list()
2236 timer->base = new_base; in migrate_hrtimer_list()
2261 raw_spin_lock(&old_base->lock); in hrtimers_cpu_dying()
2262 raw_spin_lock_nested(&new_base->lock, SINGLE_DEPTH_NESTING); in hrtimers_cpu_dying()
2265 migrate_hrtimer_list(&old_base->clock_base[i], in hrtimers_cpu_dying()
2266 &new_base->clock_base[i]); in hrtimers_cpu_dying()
2274 /* Tell the other CPU to retrigger the next event */ in hrtimers_cpu_dying()
2277 raw_spin_unlock(&new_base->lock); in hrtimers_cpu_dying()
2278 old_base->online = 0; in hrtimers_cpu_dying()
2279 raw_spin_unlock(&old_base->lock); in hrtimers_cpu_dying()