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generated by cgit v1.2.2 (git 2.25.0) at 2025-03-03 16:19:47 -0500
lass="hl kwb">void debug_hrtimer_activate(struct hrtimer *timer) { debug_object_activate(timer, &hrtimer_debug_descr); } static inline void debug_hrtimer_deactivate(struct hrtimer *timer) { debug_object_deactivate(timer, &hrtimer_debug_descr); } static inline void debug_hrtimer_free(struct hrtimer *timer) { debug_object_free(timer, &hrtimer_debug_descr); } static void __hrtimer_init(struct hrtimer *timer, clockid_t clock_id, enum hrtimer_mode mode); void hrtimer_init_on_stack(struct hrtimer *timer, clockid_t clock_id, enum hrtimer_mode mode) { debug_object_init_on_stack(timer, &hrtimer_debug_descr); __hrtimer_init(timer, clock_id, mode); } void destroy_hrtimer_on_stack(struct hrtimer *timer) { debug_object_free(timer, &hrtimer_debug_descr); } #else static inline void debug_hrtimer_init(struct hrtimer *timer) { } static inline void debug_hrtimer_activate(struct hrtimer *timer) { } static inline void debug_hrtimer_deactivate(struct hrtimer *timer) { } #endif /* * Check, whether the timer is on the callback pending list */ static inline int hrtimer_cb_pending(const struct hrtimer *timer) { return timer->state & HRTIMER_STATE_PENDING; } /* * Remove a timer from the callback pending list */ static inline void hrtimer_remove_cb_pending(struct hrtimer *timer) { list_del_init(&timer->cb_entry); } /* High resolution timer related functions */ #ifdef CONFIG_HIGH_RES_TIMERS /* * High resolution timer enabled ? */ static int hrtimer_hres_enabled __read_mostly = 1; /* * Enable / Disable high resolution mode */ static int __init setup_hrtimer_hres(char *str) { if (!strcmp(str, "off")) hrtimer_hres_enabled = 0; else if (!strcmp(str, "on")) hrtimer_hres_enabled = 1; else return 0; return 1; } __setup("highres=", setup_hrtimer_hres); /* * hrtimer_high_res_enabled - query, if the highres mode is enabled */ static inline int hrtimer_is_hres_enabled(void) { return hrtimer_hres_enabled; } /* * Is the high resolution mode active ? */ static inline int hrtimer_hres_active(void) { return __get_cpu_var(hrtimer_bases).hres_active; } /* * Reprogram the event source with checking both queues for the * next event * Called with interrupts disabled and base->lock held */ static void hrtimer_force_reprogram(struct hrtimer_cpu_base *cpu_base) { int i; struct hrtimer_clock_base *base = cpu_base->clock_base; ktime_t expires; cpu_base->expires_next.tv64 = KTIME_MAX; for (i = 0; i < HRTIMER_MAX_CLOCK_BASES; i++, base++) { struct hrtimer *timer; if (!base->first) continue; timer = rb_entry(base->first, struct hrtimer, node); expires = ktime_sub(hrtimer_get_expires(timer), base->offset); if (expires.tv64 < cpu_base->expires_next.tv64) cpu_base->expires_next = expires; } if (cpu_base->expires_next.tv64 != KTIME_MAX) tick_program_event(cpu_base->expires_next, 1); } /* * Shared reprogramming for clock_realtime and clock_monotonic * * When a timer is enqueued and expires earlier than the already enqueued * timers, we have to check, whether it expires earlier than the timer for * which the clock event device was armed. * * Called with interrupts disabled and base->cpu_base.lock held */ static int hrtimer_reprogram(struct hrtimer *timer, struct hrtimer_clock_base *base) { ktime_t *expires_next = &__get_cpu_var(hrtimer_bases).expires_next; ktime_t expires = ktime_sub(hrtimer_get_expires(timer), base->offset); int res; WARN_ON_ONCE(hrtimer_get_expires_tv64(timer) < 0); /* * When the callback is running, we do not reprogram the clock event * device. The timer callback is either running on a different CPU or * the callback is executed in the hrtimer_interrupt context. The * reprogramming is handled either by the softirq, which called the * callback or at the end of the hrtimer_interrupt. */ if (hrtimer_callback_running(timer)) return 0; /* * CLOCK_REALTIME timer might be requested with an absolute * expiry time which is less than base->offset. Nothing wrong * about that, just avoid to call into the tick code, which * has now objections against negative expiry values. */ if (expires.tv64 < 0) return -ETIME; if (expires.tv64 >= expires_next->tv64) return 0; /* * Clockevents returns -ETIME, when the event was in the past. */ res = tick_program_event(expires, 0); if (!IS_ERR_VALUE(res)) *expires_next = expires; return res; } /* * Retrigger next event is called after clock was set * * Called with interrupts disabled via on_each_cpu() */ static void retrigger_next_event(void *arg) { struct hrtimer_cpu_base *base; struct timespec realtime_offset; unsigned long seq; if (!hrtimer_hres_active()) return; do { seq = read_seqbegin(&xtime_lock); set_normalized_timespec(&realtime_offset, -wall_to_monotonic.tv_sec, -wall_to_monotonic.tv_nsec); } while (read_seqretry(&xtime_lock, seq)); base = &__get_cpu_var(hrtimer_bases); /* Adjust CLOCK_REALTIME offset */ spin_lock(&base->lock); base->clock_base[CLOCK_REALTIME].offset = timespec_to_ktime(realtime_offset); hrtimer_force_reprogram(base); spin_unlock(&base->lock); } /* * Clock realtime was set * * Change the offset of the realtime clock vs. the monotonic * clock. * * We might have to reprogram the high resolution timer interrupt. On * SMP we call the architecture specific code to retrigger _all_ high * resolution timer interrupts. On UP we just disable interrupts and * call the high resolution interrupt code. */ void clock_was_set(void) { /* Retrigger the CPU local events everywhere */ on_each_cpu(retrigger_next_event, NULL, 1); } /* * During resume we might have to reprogram the high resolution timer * interrupt (on the local CPU): */ void hres_timers_resume(void) { /* Retrigger the CPU local events: */ retrigger_next_event(NULL); } /* * Initialize the high resolution related parts of cpu_base */ static inline void hrtimer_init_hres(struct hrtimer_cpu_base *base) { base->expires_next.tv64 = KTIME_MAX; base->hres_active = 0; } /* * Initialize the high resolution related parts of a hrtimer */ static inline void hrtimer_init_timer_hres(struct hrtimer *timer) { } /* * When High resolution timers are active, try to reprogram. Note, that in case * the state has HRTIMER_STATE_CALLBACK set, no reprogramming and no expiry * check happens. The timer gets enqueued into the rbtree. The reprogramming * and expiry check is done in the hrtimer_interrupt or in the softirq. */ static inline int hrtimer_enqueue_reprogram(struct hrtimer *timer, struct hrtimer_clock_base *base) { if (base->cpu_base->hres_active && hrtimer_reprogram(timer, base)) { /* Timer is expired, act upon the callback mode */ switch(timer->cb_mode) { case HRTIMER_CB_IRQSAFE_NO_RESTART: debug_hrtimer_deactivate(timer); /* * We can call the callback from here. No restart * happens, so no danger of recursion */ BUG_ON(timer->function(timer) != HRTIMER_NORESTART); return 1; case HRTIMER_CB_IRQSAFE_NO_SOFTIRQ: /* * This is solely for the sched tick emulation with * dynamic tick support to ensure that we do not * restart the tick right on the edge and end up with * the tick timer in the softirq ! The calling site * takes care of this. */ debug_hrtimer_deactivate(timer); return 1; case HRTIMER_CB_IRQSAFE: case HRTIMER_CB_SOFTIRQ: /* * Move everything else into the softirq pending list ! */ list_add_tail(&timer->cb_entry, &base->cpu_base->cb_pending); timer->state = HRTIMER_STATE_PENDING; return 1; default: BUG(); } } return 0; } /* * Switch to high resolution mode */ static int hrtimer_switch_to_hres(void) { int cpu = smp_processor_id(); struct hrtimer_cpu_base *base = &per_cpu(hrtimer_bases, cpu); unsigned long flags; if (base->hres_active) return 1; local_irq_save(flags); if (tick_init_highres()) { local_irq_restore(flags); printk(KERN_WARNING "Could not switch to high resolution " "mode on CPU %d\n", cpu); return 0; } base->hres_active = 1; base->clock_base[CLOCK_REALTIME].resolution = KTIME_HIGH_RES; base->clock_base[CLOCK_MONOTONIC].resolution = KTIME_HIGH_RES; tick_setup_sched_timer(); /* "Retrigger" the interrupt to get things going */ retrigger_next_event(NULL); local_irq_restore(flags); printk(KERN_DEBUG "Switched to high resolution mode on CPU %d\n", smp_processor_id()); return 1; } static inline void hrtimer_raise_softirq(void) { raise_softirq(HRTIMER_SOFTIRQ); } #else static inline int hrtimer_hres_active(void) { return 0; } static inline int hrtimer_is_hres_enabled(void) { return 0; } static inline int hrtimer_switch_to_hres(void) { return 0; } static inline void hrtimer_force_reprogram(struct hrtimer_cpu_base *base) { } static inline int hrtimer_enqueue_reprogram(struct hrtimer *timer, struct hrtimer_clock_base *base) { return 0; } static inline void hrtimer_init_hres(struct hrtimer_cpu_base *base) { } static inline void hrtimer_init_timer_hres(struct hrtimer *timer) { } static inline int hrtimer_reprogram(struct hrtimer *timer, struct hrtimer_clock_base *base) { return 0; } static inline void hrtimer_raise_softirq(void) { } #endif /* CONFIG_HIGH_RES_TIMERS */ #ifdef CONFIG_TIMER_STATS void __timer_stats_hrtimer_set_start_info(struct hrtimer *timer, void *addr) { if (timer->start_site) return; timer->start_site = addr; memcpy(timer->start_comm, current->comm, TASK_COMM_LEN); timer->start_pid = current->pid; } #endif /* * Counterpart to lock_hrtimer_base above: */ static inline void unlock_hrtimer_base(const struct hrtimer *timer, unsigned long *flags) { spin_unlock_irqrestore(&timer->base->cpu_base->lock, *flags); } /** * hrtimer_forward - forward the timer expiry * @timer: hrtimer to forward * @now: forward past this time * @interval: the interval to forward * * Forward the timer expiry so it will expire in the future. * Returns the number of overruns. */ u64 hrtimer_forward(struct hrtimer *timer, ktime_t now, ktime_t interval) { u64 orun = 1; ktime_t delta; delta = ktime_sub(now, hrtimer_get_expires(timer)); if (delta.tv64 < 0) return 0; if (interval.tv64 < timer->base->resolution.tv64) interval.tv64 = timer->base->resolution.tv64; if (unlikely(delta.tv64 >= interval.tv64)) { s64 incr = ktime_to_ns(interval); orun = ktime_divns(delta, incr); hrtimer_add_expires_ns(timer, incr * orun); if (hrtimer_get_expires_tv64(timer) > now.tv64) return orun; /* * This (and the ktime_add() below) is the * correction for exact: */ orun++; } hrtimer_add_expires(timer, interval); return orun; } EXPORT_SYMBOL_GPL(hrtimer_forward); /* * enqueue_hrtimer - internal function to (re)start a timer * * The timer is inserted in expiry order. Insertion into the * red black tree is O(log(n)). Must hold the base lock. */ static void enqueue_hrtimer(struct hrtimer *timer, struct hrtimer_clock_base *base, int reprogram) { struct rb_node **link = &base->active.rb_node; struct rb_node *parent = NULL; struct hrtimer *entry; int leftmost = 1; debug_hrtimer_activate(timer); /* * Find the right place in the rbtree: */ while (*link) { parent = *link; entry = rb_entry(parent, struct hrtimer, node); /* * We dont care about collisions. Nodes with * the same expiry time stay together. */ if (hrtimer_get_expires_tv64(timer) < hrtimer_get_expires_tv64(entry)) { link = &(*link)->rb_left; } else { link = &(*link)->rb_right; leftmost = 0; } } /* * Insert the timer to the rbtree and check whether it * replaces the first pending timer */ if (leftmost) { /* * Reprogram the clock event device. When the timer is already * expired hrtimer_enqueue_reprogram has either called the * callback or added it to the pending list and raised the * softirq. * * This is a NOP for !HIGHRES */ if (reprogram && hrtimer_enqueue_reprogram(timer, base)) return; base->first = &timer->node; } rb_link_node(&timer->node, parent, link); rb_insert_color(&timer->node, &base->active); /* * HRTIMER_STATE_ENQUEUED is or'ed to the current state to preserve the * state of a possibly running callback. */ timer->state |= HRTIMER_STATE_ENQUEUED; } /* * __remove_hrtimer - internal function to remove a timer * * Caller must hold the base lock. * * High resolution timer mode reprograms the clock event device when the * timer is the one which expires next. The caller can disable this by setting * reprogram to zero. This is useful, when the context does a reprogramming * anyway (e.g. timer interrupt) */ static void __remove_hrtimer(struct hrtimer *timer, struct hrtimer_clock_base *base, unsigned long newstate, int reprogram) { /* High res. callback list. NOP for !HIGHRES */ if (hrtimer_cb_pending(timer)) hrtimer_remove_cb_pending(timer); else { /* * Remove the timer from the rbtree and replace the * first entry pointer if necessary. */ if (base->first == &timer->node) { base->first = rb_next(&timer->node); /* Reprogram the clock event device. if enabled */ if (reprogram && hrtimer_hres_active()) hrtimer_force_reprogram(base->cpu_base); } rb_erase(&timer->node, &base->active); } timer->state = newstate; } /* * remove hrtimer, called with base lock held */ static inline int remove_hrtimer(struct hrtimer *timer, struct hrtimer_clock_base *base) { if (hrtimer_is_queued(timer)) { int reprogram; /* * Remove the timer and force reprogramming when high * resolution mode is active and the timer is on the current * CPU. If we remove a timer on another CPU, reprogramming is * skipped. The interrupt event on this CPU is fired and * reprogramming happens in the interrupt handler. This is a * rare case and less expensive than a smp call. */ debug_hrtimer_deactivate(timer); timer_stats_hrtimer_clear_start_info(timer); reprogram = base->cpu_base == &__get_cpu_var(hrtimer_bases); __remove_hrtimer(timer, base, HRTIMER_STATE_INACTIVE, reprogram); return 1; } return 0; } /** * hrtimer_start - (re)start an relative timer on the current CPU * @timer: the timer to be added * @tim: expiry time * @mode: expiry mode: absolute (HRTIMER_ABS) or relative (HRTIMER_REL) * * Returns: * 0 on success * 1 when the timer was active */ int hrtimer_start(struct hrtimer *timer, ktime_t tim, const enum hrtimer_mode mode) { struct hrtimer_clock_base *base, *new_base; unsigned long flags; int ret, raise; base = lock_hrtimer_base(timer, &flags); /* Remove an active timer from the queue: */ ret = remove_hrtimer(timer, base); /* Switch the timer base, if necessary: */ new_base = switch_hrtimer_base(timer, base); if (mode == HRTIMER_MODE_REL) { tim = ktime_add_safe(tim, new_base->get_time()); /* * CONFIG_TIME_LOW_RES is a temporary way for architectures * to signal that they simply return xtime in * do_gettimeoffset(). In this case we want to round up by * resolution when starting a relative timer, to avoid short * timeouts. This will go away with the GTOD framework. */ #ifdef CONFIG_TIME_LOW_RES tim = ktime_add_safe(tim, base->resolution); #endif } hrtimer_set_expires(timer, tim); timer_stats_hrtimer_set_start_info(timer); /* * Only allow reprogramming if the new base is on this CPU. * (it might still be on another CPU if the timer was pending) */ enqueue_hrtimer(timer, new_base, new_base->cpu_base == &__get_cpu_var(hrtimer_bases)); /* * The timer may be expired and moved to the cb_pending * list. We can not raise the softirq with base lock held due * to a possible deadlock with runqueue lock. */ raise = timer->state == HRTIMER_STATE_PENDING; /* * We use preempt_disable to prevent this task from migrating after * setting up the softirq and raising it. Otherwise, if me migrate * we will raise the softirq on the wrong CPU. */ preempt_disable(); unlock_hrtimer_base(timer, &flags); if (raise) hrtimer_raise_softirq(); preempt_enable(); return ret; } EXPORT_SYMBOL_GPL(hrtimer_start); /** * hrtimer_try_to_cancel - try to deactivate a timer * @timer: hrtimer to stop * * Returns: * 0 when the timer was not active * 1 when the timer was active * -1 when the timer is currently excuting the callback function and * cannot be stopped */ int hrtimer_try_to_cancel(struct hrtimer *timer) { struct hrtimer_clock_base *base; unsigned long flags; int ret = -1; base = lock_hrtimer_base(timer, &flags); if (!hrtimer_callback_running(timer)) ret = remove_hrtimer(timer, base); unlock_hrtimer_base(timer, &flags); return ret; } EXPORT_SYMBOL_GPL(hrtimer_try_to_cancel); /** * hrtimer_cancel - cancel a timer and wait for the handler to finish. * @timer: the timer to be cancelled * * Returns: * 0 when the timer was not active * 1 when the timer was active */ int hrtimer_cancel(struct hrtimer *timer) { for (;;) { int ret = hrtimer_try_to_cancel(timer); if (ret >= 0) return ret; cpu_relax(); } } EXPORT_SYMBOL_GPL(hrtimer_cancel); /** * hrtimer_get_remaining - get remaining time for the timer * @timer: the timer to read */ ktime_t hrtimer_get_remaining(const struct hrtimer *timer) { struct hrtimer_clock_base *base; unsigned long flags; ktime_t rem; base = lock_hrtimer_base(timer, &flags); rem = hrtimer_expires_remaining(timer); unlock_hrtimer_base(timer, &flags); return rem; } EXPORT_SYMBOL_GPL(hrtimer_get_remaining); #ifdef CONFIG_NO_HZ /** * hrtimer_get_next_event - get the time until next expiry event * * Returns the delta to the next expiry event or KTIME_MAX if no timer * is pending. */ ktime_t hrtimer_get_next_event(void) { struct hrtimer_cpu_base *cpu_base = &__get_cpu_var(hrtimer_bases); struct hrtimer_clock_base *base = cpu_base->clock_base; ktime_t delta, mindelta = { .tv64 = KTIME_MAX }; unsigned long flags; int i; spin_lock_irqsave(&cpu_base->lock, flags); if (!hrtimer_hres_active()) { for (i = 0; i < HRTIMER_MAX_CLOCK_BASES; i++, base++) { struct hrtimer *timer; if (!base->first) continue; timer = rb_entry(base->first, struct hrtimer, node); delta.tv64 = hrtimer_get_expires_tv64(timer); delta = ktime_sub(delta, base->get_time()); if (delta.tv64 < mindelta.tv64) mindelta.tv64 = delta.tv64; } } spin_unlock_irqrestore(&cpu_base->lock, flags); if (mindelta.tv64 < 0) mindelta.tv64 = 0; return mindelta; } #endif static void __hrtimer_init(struct hrtimer *timer, clockid_t clock_id, enum hrtimer_mode mode) { struct hrtimer_cpu_base *cpu_base; memset(timer, 0, sizeof(struct hrtimer)); cpu_base = &__raw_get_cpu_var(hrtimer_bases); if (clock_id == CLOCK_REALTIME && mode != HRTIMER_MODE_ABS) clock_id = CLOCK_MONOTONIC; timer->base = &cpu_base->clock_base[clock_id]; INIT_LIST_HEAD(&timer->cb_entry); hrtimer_init_timer_hres(timer); #ifdef CONFIG_TIMER_STATS timer->start_site = NULL; timer->start_pid = -1; memset(timer->start_comm, 0, TASK_COMM_LEN); #endif } /** * hrtimer_init - initialize a timer to the given clock * @timer: the timer to be initialized * @clock_id: the clock to be used * @mode: timer mode abs/rel */ void hrtimer_init(struct hrtimer *timer, clockid_t clock_id, enum hrtimer_mode mode) { debug_hrtimer_init(timer); __hrtimer_init(timer, clock_id, mode); } EXPORT_SYMBOL_GPL(hrtimer_init); /** * hrtimer_get_res - get the timer resolution for a clock * @which_clock: which clock to query * @tp: pointer to timespec variable to store the resolution * * Store the resolution of the clock selected by @which_clock in the * variable pointed to by @tp. */ int hrtimer_get_res(const clockid_t which_clock, struct timespec *tp) { struct hrtimer_cpu_base *cpu_base; cpu_base = &__raw_get_cpu_var(hrtimer_bases); *tp = ktime_to_timespec(cpu_base->clock_base[which_clock].resolution); return 0; } EXPORT_SYMBOL_GPL(hrtimer_get_res); static void run_hrtimer_pending(struct hrtimer_cpu_base *cpu_base) { spin_lock_irq(&cpu_base->lock); while (!list_empty(&cpu_base->cb_pending)) { enum hrtimer_restart (*fn)(struct hrtimer *); struct hrtimer *timer; int restart; timer = list_entry(cpu_base->cb_pending.next, struct hrtimer, cb_entry); debug_hrtimer_deactivate(timer); timer_stats_account_hrtimer(timer); fn = timer->function; __remove_hrtimer(timer, timer->base, HRTIMER_STATE_CALLBACK, 0); spin_unlock_irq(&cpu_base->lock); restart = fn(timer); spin_lock_irq(&cpu_base->lock); timer->state &= ~HRTIMER_STATE_CALLBACK; if (restart == HRTIMER_RESTART) { BUG_ON(hrtimer_active(timer)); /* * Enqueue the timer, allow reprogramming of the event * device */ enqueue_hrtimer(timer, timer->base, 1); } else if (hrtimer_active(timer)) { /* * If the timer was rearmed on another CPU, reprogram * the event device. */ struct hrtimer_clock_base *base = timer->base; if (base->first == &timer->node && hrtimer_reprogram(timer, base)) { /* * Timer is expired. Thus move it from tree to * pending list again. */ __remove_hrtimer(timer, base, HRTIMER_STATE_PENDING, 0); list_add_tail(&timer->cb_entry, &base->cpu_base->cb_pending); } } } spin_unlock_irq(&cpu_base->lock); } static void __run_hrtimer(struct hrtimer *timer) { struct hrtimer_clock_base *base = timer->base; struct hrtimer_cpu_base *cpu_base = base->cpu_base; enum hrtimer_restart (*fn)(struct hrtimer *); int restart; debug_hrtimer_deactivate(timer); __remove_hrtimer(timer, base, HRTIMER_STATE_CALLBACK, 0); timer_stats_account_hrtimer(timer); fn = timer->function; if (timer->cb_mode == HRTIMER_CB_IRQSAFE_NO_SOFTIRQ) { /* * Used for scheduler timers, avoid lock inversion with * rq->lock and tasklist_lock. * * These timers are required to deal with enqueue expiry * themselves and are not allowed to migrate. */ spin_unlock(&cpu_base->lock); restart = fn(timer); spin_lock(&cpu_base->lock); } else restart = fn(timer); /* * Note: We clear the CALLBACK bit after enqueue_hrtimer to avoid * reprogramming of the event hardware. This happens at the end of this * function anyway. */ if (restart != HRTIMER_NORESTART) { BUG_ON(timer->state != HRTIMER_STATE_CALLBACK); enqueue_hrtimer(timer, base, 0); } timer->state &= ~HRTIMER_STATE_CALLBACK; } #ifdef CONFIG_HIGH_RES_TIMERS /* * High resolution timer interrupt * Called with interrupts disabled */ void hrtimer_interrupt(struct clock_event_device *dev) { struct hrtimer_cpu_base *cpu_base = &__get_cpu_var(hrtimer_bases); struct hrtimer_clock_base *base; ktime_t expires_next, now; int i, raise = 0; BUG_ON(!cpu_base->hres_active); cpu_base->nr_events++; dev->next_event.tv64 = KTIME_MAX; retry: now = ktime_get(); expires_next.tv64 = KTIME_MAX; base = cpu_base->clock_base; for (i = 0; i < HRTIMER_MAX_CLOCK_BASES; i++) { ktime_t basenow; struct rb_node *node; spin_lock(&cpu_base->lock); basenow = ktime_add(now, base->offset); while ((node = base->first)) { struct hrtimer *timer; timer = rb_entry(node, struct hrtimer, node); /* * The immediate goal for using the softexpires is * minimizing wakeups, not running timers at the * earliest interrupt after their soft expiration. * This allows us to avoid using a Priority Search * Tree, which can answer a stabbing querry for * overlapping intervals and instead use the simple * BST we already have. * We don't add extra wakeups by delaying timers that * are right-of a not yet expired timer, because that * timer will have to trigger a wakeup anyway. */ if (basenow.tv64 < hrtimer_get_softexpires_tv64(timer)) { ktime_t expires; expires = ktime_sub(hrtimer_get_expires(timer), base->offset); if (expires.tv64 < expires_next.tv64) expires_next = expires; break; } /* Move softirq callbacks to the pending list */ if (timer->cb_mode == HRTIMER_CB_SOFTIRQ) { __remove_hrtimer(timer, base, HRTIMER_STATE_PENDING, 0); list_add_tail(&timer->cb_entry, &base->cpu_base->cb_pending); raise = 1; continue; } __run_hrtimer(timer); } spin_unlock(&cpu_base->lock); base++; } cpu_base->expires_next = expires_next; /* Reprogramming necessary ? */ if (expires_next.tv64 != KTIME_MAX) { if (tick_program_event(expires_next, 0)) goto retry; } /* Raise softirq ? */ if (raise) raise_softirq(HRTIMER_SOFTIRQ); } static void run_hrtimer_softirq(struct softirq_action *h) { run_hrtimer_pending(&__get_cpu_var(hrtimer_bases)); } #endif /* CONFIG_HIGH_RES_TIMERS */ /* * Called from timer softirq every jiffy, expire hrtimers: * * For HRT its the fall back code to run the softirq in the timer * softirq context in case the hrtimer initialization failed or has * not been done yet. */ void hrtimer_run_pending(void) { struct hrtimer_cpu_base *cpu_base = &__get_cpu_var(hrtimer_bases); if (hrtimer_hres_active()) return; /* * This _is_ ugly: We have to check in the softirq context, * whether we can switch to highres and / or nohz mode. The * clocksource switch happens in the timer interrupt with * xtime_lock held. Notification from there only sets the * check bit in the tick_oneshot code, otherwise we might * deadlock vs. xtime_lock. */ if (tick_check_oneshot_change(!hrtimer_is_hres_enabled())) hrtimer_switch_to_hres(); run_hrtimer_pending(cpu_base); } /* * Called from hardirq context every jiffy */ void hrtimer_run_queues(void) { struct rb_node *node; struct hrtimer_cpu_base *cpu_base = &__get_cpu_var(hrtimer_bases); struct hrtimer_clock_base *base; int index, gettime = 1; if (hrtimer_hres_active()) return; for (index = 0; index < HRTIMER_MAX_CLOCK_BASES; index++) { base = &cpu_base->clock_base[index]; if (!base->first) continue; if (base->get_softirq_time) base->softirq_time = base->get_softirq_time(); else if (gettime) { hrtimer_get_softirq_time(cpu_base); gettime = 0; } spin_lock(&cpu_base->lock); while ((node = base->first)) { struct hrtimer *timer; timer = rb_entry(node, struct hrtimer, node); if (base->softirq_time.tv64 <= hrtimer_get_expires_tv64(timer)) break; if (timer->cb_mode == HRTIMER_CB_SOFTIRQ) { __remove_hrtimer(timer, base, HRTIMER_STATE_PENDING, 0); list_add_tail(&timer->cb_entry, &base->cpu_base->cb_pending); continue; } __run_hrtimer(timer); } spin_unlock(&cpu_base->lock); } } /* * Sleep related functions: */ static enum hrtimer_restart hrtimer_wakeup(struct hrtimer *timer) { struct hrtimer_sleeper *t = container_of(timer, struct hrtimer_sleeper, timer); struct task_struct *task = t->task; t->task = NULL; if (task) wake_up_process(task); return HRTIMER_NORESTART; } void hrtimer_init_sleeper(struct hrtimer_sleeper *sl, struct task_struct *task) { sl->timer.function = hrtimer_wakeup; sl->task = task; #ifdef CONFIG_HIGH_RES_TIMERS sl->timer.cb_mode = HRTIMER_CB_IRQSAFE_NO_SOFTIRQ; #endif } static int __sched do_nanosleep(struct hrtimer_sleeper *t, enum hrtimer_mode mode) { hrtimer_init_sleeper(t, current); do { set_current_state(TASK_INTERRUPTIBLE); hrtimer_start_expires(&t->timer, mode); if (!hrtimer_active(&t->timer)) t->task = NULL; if (likely(t->task)) schedule(); hrtimer_cancel(&t->timer); mode = HRTIMER_MODE_ABS; } while (t->task && !signal_pending(current)); __set_current_state(TASK_RUNNING); return t->task == NULL; } static int update_rmtp(struct hrtimer *timer, struct timespec __user *rmtp) { struct timespec rmt; ktime_t rem; rem = hrtimer_expires_remaining(timer); if (rem.tv64 <= 0) return 0; rmt = ktime_to_timespec(rem); if (copy_to_user(rmtp, &rmt, sizeof(*rmtp))) return -EFAULT; return 1; } long __sched hrtimer_nanosleep_restart(struct restart_block *restart) { struct hrtimer_sleeper t; struct timespec __user *rmtp; int ret = 0; hrtimer_init_on_stack(&t.timer, restart->nanosleep.index, HRTIMER_MODE_ABS); hrtimer_set_expires_tv64(&t.timer, restart->nanosleep.expires); if (do_nanosleep(&t, HRTIMER_MODE_ABS)) goto out; rmtp = restart->nanosleep.rmtp; if (rmtp) { ret = update_rmtp(&t.timer, rmtp); if (ret <= 0) goto out; } /* The other values in restart are already filled in */ ret = -ERESTART_RESTARTBLOCK; out: destroy_hrtimer_on_stack(&t.timer); return ret; } long hrtimer_nanosleep(struct timespec *rqtp, struct timespec __user *rmtp, const enum hrtimer_mode mode, const clockid_t clockid) { struct restart_block *restart; struct hrtimer_sleeper t; int ret = 0; hrtimer_init_on_stack(&t.timer, clockid, mode); hrtimer_set_expires(&t.timer, timespec_to_ktime(*rqtp)); if (do_nanosleep(&t, mode)) goto out; /* Absolute timers do not update the rmtp value and restart: */ if (mode == HRTIMER_MODE_ABS) { ret = -ERESTARTNOHAND; goto out; } if (rmtp) { ret = update_rmtp(&t.timer, rmtp); if (ret <= 0) goto out; } restart = &current_thread_info()->restart_block; restart->fn = hrtimer_nanosleep_restart; restart->nanosleep.index = t.timer.base->index; restart->nanosleep.rmtp = rmtp; restart->nanosleep.expires = hrtimer_get_expires_tv64(&t.timer); ret = -ERESTART_RESTARTBLOCK; out: destroy_hrtimer_on_stack(&t.timer); return ret; } asmlinkage long sys_nanosleep(struct timespec __user *rqtp, struct timespec __user *rmtp) { struct timespec tu; if (copy_from_user(&tu, rqtp, sizeof(tu))) return -EFAULT; if (!timespec_valid(&tu)) return -EINVAL; return hrtimer_nanosleep(&tu, rmtp, HRTIMER_MODE_REL, CLOCK_MONOTONIC); } /* * Functions related to boot-time initialization: */ static void __cpuinit init_hrtimers_cpu(int cpu) { struct hrtimer_cpu_base *cpu_base = &per_cpu(hrtimer_bases, cpu); int i; spin_lock_init(&cpu_base->lock); for (i = 0; i < HRTIMER_MAX_CLOCK_BASES; i++) cpu_base->clock_base[i].cpu_base = cpu_base; INIT_LIST_HEAD(&cpu_base->cb_pending); hrtimer_init_hres(cpu_base); } #ifdef CONFIG_HOTPLUG_CPU static void migrate_hrtimer_list(struct hrtimer_clock_base *old_base, struct hrtimer_clock_base *new_base) { struct hrtimer *timer; struct rb_node *node; while ((node = rb_first(&old_base->active))) { timer = rb_entry(node, struct hrtimer, node); BUG_ON(hrtimer_callback_running(timer)); debug_hrtimer_deactivate(timer); __remove_hrtimer(timer, old_base, HRTIMER_STATE_INACTIVE, 0); timer->base = new_base; /* * Enqueue the timer. Allow reprogramming of the event device */ enqueue_hrtimer(timer, new_base, 1); } } static void migrate_hrtimers(int cpu) { struct hrtimer_cpu_base *old_base, *new_base; int i; BUG_ON(cpu_online(cpu)); old_base = &per_cpu(hrtimer_bases, cpu); new_base = &get_cpu_var(hrtimer_bases); tick_cancel_sched_timer(cpu); local_irq_disable(); spin_lock(&new_base->lock); spin_lock_nested(&old_base->lock, SINGLE_DEPTH_NESTING);