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kernel/hrtimer.c
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/* * linux/kernel/hrtimer.c * |
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* Copyright(C) 2005-2006, Thomas Gleixner <tglx@linutronix.de> |
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* Copyright(C) 2005-2007, Red Hat, Inc., Ingo Molnar |
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* Copyright(C) 2006-2007 Timesys Corp., Thomas Gleixner |
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* * High-resolution kernel timers * * In contrast to the low-resolution timeout API implemented in * kernel/timer.c, hrtimers provide finer resolution and accuracy * depending on system configuration and capabilities. * * These timers are currently used for: * - itimers * - POSIX timers * - nanosleep * - precise in-kernel timing * * Started by: Thomas Gleixner and Ingo Molnar * * Credits: * based on kernel/timer.c * |
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* Help, testing, suggestions, bugfixes, improvements were * provided by: * * George Anzinger, Andrew Morton, Steven Rostedt, Roman Zippel * et. al. * |
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* For licencing details see kernel-base/COPYING */ #include <linux/cpu.h> |
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#include <linux/irq.h> |
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#include <linux/module.h> #include <linux/percpu.h> #include <linux/hrtimer.h> #include <linux/notifier.h> #include <linux/syscalls.h> |
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#include <linux/kallsyms.h> |
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#include <linux/interrupt.h> |
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#include <linux/tick.h> |
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#include <linux/seq_file.h> #include <linux/err.h> |
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#include <linux/debugobjects.h> |
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#include <asm/uaccess.h> /** * ktime_get - get the monotonic time in ktime_t format * * returns the time in ktime_t format */ |
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ktime_t ktime_get(void) |
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{ struct timespec now; ktime_get_ts(&now); return timespec_to_ktime(now); } |
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EXPORT_SYMBOL_GPL(ktime_get); |
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/** * ktime_get_real - get the real (wall-) time in ktime_t format * * returns the time in ktime_t format */ |
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ktime_t ktime_get_real(void) |
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{ struct timespec now; getnstimeofday(&now); return timespec_to_ktime(now); } EXPORT_SYMBOL_GPL(ktime_get_real); /* * The timer bases: |
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* * Note: If we want to add new timer bases, we have to skip the two * clock ids captured by the cpu-timers. We do this by holding empty * entries rather than doing math adjustment of the clock ids. * This ensures that we capture erroneous accesses to these clock ids * rather than moving them into the range of valid clock id's. |
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*/ |
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DEFINE_PER_CPU(struct hrtimer_cpu_base, hrtimer_bases) = |
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{ |
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.clock_base = |
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{ |
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{ .index = CLOCK_REALTIME, .get_time = &ktime_get_real, |
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.resolution = KTIME_LOW_RES, |
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}, { .index = CLOCK_MONOTONIC, .get_time = &ktime_get, |
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.resolution = KTIME_LOW_RES, |
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}, } |
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}; /** * ktime_get_ts - get the monotonic clock in timespec format |
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* @ts: pointer to timespec variable * * The function calculates the monotonic clock from the realtime * clock and the wall_to_monotonic offset and stores the result |
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* in normalized timespec format in the variable pointed to by @ts. |
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*/ void ktime_get_ts(struct timespec *ts) { struct timespec tomono; unsigned long seq; do { seq = read_seqbegin(&xtime_lock); getnstimeofday(ts); tomono = wall_to_monotonic; } while (read_seqretry(&xtime_lock, seq)); set_normalized_timespec(ts, ts->tv_sec + tomono.tv_sec, ts->tv_nsec + tomono.tv_nsec); } |
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EXPORT_SYMBOL_GPL(ktime_get_ts); |
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/* |
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* Get the coarse grained time at the softirq based on xtime and * wall_to_monotonic. */ |
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static void hrtimer_get_softirq_time(struct hrtimer_cpu_base *base) |
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{ ktime_t xtim, tomono; |
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struct timespec xts, tom; |
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unsigned long seq; do { seq = read_seqbegin(&xtime_lock); |
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xts = current_kernel_time(); |
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tom = wall_to_monotonic; |
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} while (read_seqretry(&xtime_lock, seq)); |
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xtim = timespec_to_ktime(xts); |
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tomono = timespec_to_ktime(tom); |
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base->clock_base[CLOCK_REALTIME].softirq_time = xtim; base->clock_base[CLOCK_MONOTONIC].softirq_time = ktime_add(xtim, tomono); |
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} /* |
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* Functions and macros which are different for UP/SMP systems are kept in a * single place */ #ifdef CONFIG_SMP |
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/* * We are using hashed locking: holding per_cpu(hrtimer_bases)[n].lock * means that all timers which are tied to this base via timer->base are * locked, and the base itself is locked too. * * So __run_timers/migrate_timers can safely modify all timers which could * be found on the lists/queues. * * When the timer's base is locked, and the timer removed from list, it is * possible to set timer->base = NULL and drop the lock: the timer remains * locked. */ |
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static struct hrtimer_clock_base *lock_hrtimer_base(const struct hrtimer *timer, unsigned long *flags) |
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{ |
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struct hrtimer_clock_base *base; |
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for (;;) { base = timer->base; if (likely(base != NULL)) { |
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spin_lock_irqsave(&base->cpu_base->lock, *flags); |
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if (likely(base == timer->base)) return base; /* The timer has migrated to another CPU: */ |
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spin_unlock_irqrestore(&base->cpu_base->lock, *flags); |
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} cpu_relax(); } } /* * Switch the timer base to the current CPU when possible. */ |
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static inline struct hrtimer_clock_base * switch_hrtimer_base(struct hrtimer *timer, struct hrtimer_clock_base *base) |
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{ |
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struct hrtimer_clock_base *new_base; struct hrtimer_cpu_base *new_cpu_base; |
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|
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new_cpu_base = &__get_cpu_var(hrtimer_bases); new_base = &new_cpu_base->clock_base[base->index]; |
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if (base != new_base) { /* * We are trying to schedule the timer on the local CPU. * However we can't change timer's base while it is running, * so we keep it on the same CPU. No hassle vs. reprogramming * the event source in the high resolution case. The softirq * code will take care of this when the timer function has * completed. There is no conflict as we hold the lock until * the timer is enqueued. */ |
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if (unlikely(hrtimer_callback_running(timer))) |
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return base; /* See the comment in lock_timer_base() */ timer->base = NULL; |
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spin_unlock(&base->cpu_base->lock); spin_lock(&new_base->cpu_base->lock); |
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timer->base = new_base; } return new_base; } #else /* CONFIG_SMP */ |
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static inline struct hrtimer_clock_base * |
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lock_hrtimer_base(const struct hrtimer *timer, unsigned long *flags) { |
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struct hrtimer_clock_base *base = timer->base; |
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spin_lock_irqsave(&base->cpu_base->lock, *flags); |
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return base; } |
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# define switch_hrtimer_base(t, b) (b) |
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#endif /* !CONFIG_SMP */ /* * Functions for the union type storage format of ktime_t which are * too large for inlining: */ #if BITS_PER_LONG < 64 # ifndef CONFIG_KTIME_SCALAR /** * ktime_add_ns - Add a scalar nanoseconds value to a ktime_t variable |
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* @kt: addend * @nsec: the scalar nsec value to add * * Returns the sum of kt and nsec in ktime_t format */ ktime_t ktime_add_ns(const ktime_t kt, u64 nsec) { ktime_t tmp; if (likely(nsec < NSEC_PER_SEC)) { tmp.tv64 = nsec; } else { unsigned long rem = do_div(nsec, NSEC_PER_SEC); tmp = ktime_set((long)nsec, rem); } return ktime_add(kt, tmp); } |
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EXPORT_SYMBOL_GPL(ktime_add_ns); |
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/** * ktime_sub_ns - Subtract a scalar nanoseconds value from a ktime_t variable * @kt: minuend * @nsec: the scalar nsec value to subtract * * Returns the subtraction of @nsec from @kt in ktime_t format */ ktime_t ktime_sub_ns(const ktime_t kt, u64 nsec) { ktime_t tmp; if (likely(nsec < NSEC_PER_SEC)) { tmp.tv64 = nsec; } else { unsigned long rem = do_div(nsec, NSEC_PER_SEC); tmp = ktime_set((long)nsec, rem); } return ktime_sub(kt, tmp); } EXPORT_SYMBOL_GPL(ktime_sub_ns); |
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# endif /* !CONFIG_KTIME_SCALAR */ /* * Divide a ktime value by a nanosecond value */ |
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u64 ktime_divns(const ktime_t kt, s64 div) |
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{ |
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u64 dclc; |
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int sft = 0; |
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dclc = ktime_to_ns(kt); |
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/* Make sure the divisor is less than 2^32: */ while (div >> 32) { sft++; div >>= 1; } dclc >>= sft; do_div(dclc, (unsigned long) div); |
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return dclc; |
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} |
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#endif /* BITS_PER_LONG >= 64 */ |
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/* |
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* Add two ktime values and do a safety check for overflow: */ ktime_t ktime_add_safe(const ktime_t lhs, const ktime_t rhs) { ktime_t res = ktime_add(lhs, rhs); /* * We use KTIME_SEC_MAX here, the maximum timeout which we can * return to user space in a timespec: */ if (res.tv64 < 0 || res.tv64 < lhs.tv64 || res.tv64 < rhs.tv64) res = ktime_set(KTIME_SEC_MAX, 0); return res; } |
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#ifdef CONFIG_DEBUG_OBJECTS_TIMERS static struct debug_obj_descr hrtimer_debug_descr; /* * fixup_init is called when: * - an active object is initialized */ static int hrtimer_fixup_init(void *addr, enum debug_obj_state state) { struct hrtimer *timer = addr; switch (state) { case ODEBUG_STATE_ACTIVE: hrtimer_cancel(timer); debug_object_init(timer, &hrtimer_debug_descr); return 1; default: return 0; } } /* * fixup_activate is called when: * - an active object is activated * - an unknown object is activated (might be a statically initialized object) */ static int hrtimer_fixup_activate(void *addr, enum debug_obj_state state) { switch (state) { case ODEBUG_STATE_NOTAVAILABLE: WARN_ON_ONCE(1); return 0; case ODEBUG_STATE_ACTIVE: WARN_ON(1); default: return 0; } } /* * fixup_free is called when: * - an active object is freed */ static int hrtimer_fixup_free(void *addr, enum debug_obj_state state) { struct hrtimer *timer = addr; switch (state) { case ODEBUG_STATE_ACTIVE: hrtimer_cancel(timer); debug_object_free(timer, &hrtimer_debug_descr); return 1; default: return 0; } } static struct debug_obj_descr hrtimer_debug_descr = { .name = "hrtimer", .fixup_init = hrtimer_fixup_init, .fixup_activate = hrtimer_fixup_activate, .fixup_free = hrtimer_fixup_free, }; static inline void debug_hrtimer_init(struct hrtimer *timer) { debug_object_init(timer, &hrtimer_debug_descr); } static inline 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 |
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/* |
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* 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); } |
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/* 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); |
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expires = ktime_sub(hrtimer_get_expires(timer), base->offset); |
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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; |
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ktime_t expires = ktime_sub(hrtimer_get_expires(timer), base->offset); |
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int res; |
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WARN_ON_ONCE(hrtimer_get_expires_tv64(timer) < 0); |
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/* * When the callback is running, we do not reprogram the clock event * device. The timer callback is either running on a different CPU or |
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* the callback is executed in the hrtimer_interrupt context. The |
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* 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; |
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/* * 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; |
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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 */ |
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on_each_cpu(retrigger_next_event, NULL, 1); |
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} /* |
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* During resume we might have to reprogram the high resolution timer * interrupt (on the local CPU): */ void hres_timers_resume(void) { |
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/* Retrigger the CPU local events: */ retrigger_next_event(NULL); } /* |
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* 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; |
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} /* * Initialize the high resolution related parts of a hrtimer */ static inline void hrtimer_init_timer_hres(struct hrtimer *timer) { |
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} /* * 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) { |
ccc7dadf7 hrtimer: prevent ... |
654 655 |
case HRTIMER_CB_IRQSAFE_PERCPU: case HRTIMER_CB_IRQSAFE_UNLOCKED: |
54cdfdb47 [PATCH] hrtimers:... |
656 657 658 659 660 |
/* * 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 |
ccc7dadf7 hrtimer: prevent ... |
661 |
* takes care of this. Also used for hrtimer sleeper ! |
54cdfdb47 [PATCH] hrtimers:... |
662 |
*/ |
237fc6e7a add hrtimer speci... |
663 |
debug_hrtimer_deactivate(timer); |
54cdfdb47 [PATCH] hrtimers:... |
664 |
return 1; |
54cdfdb47 [PATCH] hrtimers:... |
665 666 667 668 669 670 671 |
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; |
54cdfdb47 [PATCH] hrtimers:... |
672 673 674 675 676 677 678 679 680 681 682 |
return 1; default: BUG(); } } return 0; } /* * Switch to high resolution mode */ |
f8953856e [PATCH] highres: ... |
683 |
static int hrtimer_switch_to_hres(void) |
54cdfdb47 [PATCH] hrtimers:... |
684 |
{ |
820de5c39 highres: improve ... |
685 686 |
int cpu = smp_processor_id(); struct hrtimer_cpu_base *base = &per_cpu(hrtimer_bases, cpu); |
54cdfdb47 [PATCH] hrtimers:... |
687 688 689 |
unsigned long flags; if (base->hres_active) |
f8953856e [PATCH] highres: ... |
690 |
return 1; |
54cdfdb47 [PATCH] hrtimers:... |
691 692 693 694 695 |
local_irq_save(flags); if (tick_init_highres()) { local_irq_restore(flags); |
820de5c39 highres: improve ... |
696 697 698 |
printk(KERN_WARNING "Could not switch to high resolution " "mode on CPU %d ", cpu); |
f8953856e [PATCH] highres: ... |
699 |
return 0; |
54cdfdb47 [PATCH] hrtimers:... |
700 701 702 703 704 705 706 707 708 709 |
} 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); |
edfed66e1 Quieten hrtimer p... |
710 711 |
printk(KERN_DEBUG "Switched to high resolution mode on CPU %d ", |
54cdfdb47 [PATCH] hrtimers:... |
712 |
smp_processor_id()); |
f8953856e [PATCH] highres: ... |
713 |
return 1; |
54cdfdb47 [PATCH] hrtimers:... |
714 |
} |
0c96c5979 hrtimer: raise so... |
715 716 717 718 |
static inline void hrtimer_raise_softirq(void) { raise_softirq(HRTIMER_SOFTIRQ); } |
54cdfdb47 [PATCH] hrtimers:... |
719 720 721 722 |
#else static inline int hrtimer_hres_active(void) { return 0; } static inline int hrtimer_is_hres_enabled(void) { return 0; } |
f8953856e [PATCH] highres: ... |
723 |
static inline int hrtimer_switch_to_hres(void) { return 0; } |
54cdfdb47 [PATCH] hrtimers:... |
724 725 726 727 728 729 |
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; } |
54cdfdb47 [PATCH] hrtimers:... |
730 731 |
static inline void hrtimer_init_hres(struct hrtimer_cpu_base *base) { } static inline void hrtimer_init_timer_hres(struct hrtimer *timer) { } |
d3d74453c hrtimer: fixup th... |
732 733 734 735 736 |
static inline int hrtimer_reprogram(struct hrtimer *timer, struct hrtimer_clock_base *base) { return 0; } |
0c96c5979 hrtimer: raise so... |
737 |
static inline void hrtimer_raise_softirq(void) { } |
54cdfdb47 [PATCH] hrtimers:... |
738 739 |
#endif /* CONFIG_HIGH_RES_TIMERS */ |
82f67cd9f [PATCH] Add debug... |
740 741 742 743 744 745 746 747 748 749 750 |
#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 |
c0a313296 [PATCH] hrtimer: ... |
751 |
/* |
6506f2aa6 fix comment: unlo... |
752 |
* Counterpart to lock_hrtimer_base above: |
c0a313296 [PATCH] hrtimer: ... |
753 754 755 756 |
*/ static inline void unlock_hrtimer_base(const struct hrtimer *timer, unsigned long *flags) { |
3c8aa39d7 [PATCH] hrtimers:... |
757 |
spin_unlock_irqrestore(&timer->base->cpu_base->lock, *flags); |
c0a313296 [PATCH] hrtimer: ... |
758 759 760 761 |
} /** * hrtimer_forward - forward the timer expiry |
c0a313296 [PATCH] hrtimer: ... |
762 |
* @timer: hrtimer to forward |
44f214755 [PATCH] hrtimers:... |
763 |
* @now: forward past this time |
c0a313296 [PATCH] hrtimer: ... |
764 765 766 |
* @interval: the interval to forward * * Forward the timer expiry so it will expire in the future. |
8dca6f33f [PATCH] hrtimer c... |
767 |
* Returns the number of overruns. |
c0a313296 [PATCH] hrtimer: ... |
768 |
*/ |
4d672e7ac timerfd: new time... |
769 |
u64 hrtimer_forward(struct hrtimer *timer, ktime_t now, ktime_t interval) |
c0a313296 [PATCH] hrtimer: ... |
770 |
{ |
4d672e7ac timerfd: new time... |
771 |
u64 orun = 1; |
44f214755 [PATCH] hrtimers:... |
772 |
ktime_t delta; |
c0a313296 [PATCH] hrtimer: ... |
773 |
|
cc584b213 hrtimer: convert ... |
774 |
delta = ktime_sub(now, hrtimer_get_expires(timer)); |
c0a313296 [PATCH] hrtimer: ... |
775 776 777 |
if (delta.tv64 < 0) return 0; |
c9db4fa11 [hrtimer] Enforce... |
778 779 |
if (interval.tv64 < timer->base->resolution.tv64) interval.tv64 = timer->base->resolution.tv64; |
c0a313296 [PATCH] hrtimer: ... |
780 |
if (unlikely(delta.tv64 >= interval.tv64)) { |
df869b630 [PATCH] hrtimers:... |
781 |
s64 incr = ktime_to_ns(interval); |
c0a313296 [PATCH] hrtimer: ... |
782 783 |
orun = ktime_divns(delta, incr); |
cc584b213 hrtimer: convert ... |
784 785 |
hrtimer_add_expires_ns(timer, incr * orun); if (hrtimer_get_expires_tv64(timer) > now.tv64) |
c0a313296 [PATCH] hrtimer: ... |
786 787 788 789 790 791 792 |
return orun; /* * This (and the ktime_add() below) is the * correction for exact: */ orun++; } |
cc584b213 hrtimer: convert ... |
793 |
hrtimer_add_expires(timer, interval); |
c0a313296 [PATCH] hrtimer: ... |
794 795 796 |
return orun; } |
6bdb6b620 export hrtimer_fo... |
797 |
EXPORT_SYMBOL_GPL(hrtimer_forward); |
c0a313296 [PATCH] hrtimer: ... |
798 799 800 801 802 803 804 |
/* * 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. */ |
3c8aa39d7 [PATCH] hrtimers:... |
805 |
static void enqueue_hrtimer(struct hrtimer *timer, |
54cdfdb47 [PATCH] hrtimers:... |
806 |
struct hrtimer_clock_base *base, int reprogram) |
c0a313296 [PATCH] hrtimer: ... |
807 808 |
{ struct rb_node **link = &base->active.rb_node; |
c0a313296 [PATCH] hrtimer: ... |
809 810 |
struct rb_node *parent = NULL; struct hrtimer *entry; |
99bc2fcb2 hrtimer: speedup ... |
811 |
int leftmost = 1; |
c0a313296 [PATCH] hrtimer: ... |
812 |
|
237fc6e7a add hrtimer speci... |
813 |
debug_hrtimer_activate(timer); |
c0a313296 [PATCH] hrtimer: ... |
814 815 816 817 818 819 820 821 822 823 |
/* * 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. */ |
cc584b213 hrtimer: convert ... |
824 825 |
if (hrtimer_get_expires_tv64(timer) < hrtimer_get_expires_tv64(entry)) { |
c0a313296 [PATCH] hrtimer: ... |
826 |
link = &(*link)->rb_left; |
99bc2fcb2 hrtimer: speedup ... |
827 |
} else { |
c0a313296 [PATCH] hrtimer: ... |
828 |
link = &(*link)->rb_right; |
99bc2fcb2 hrtimer: speedup ... |
829 830 |
leftmost = 0; } |
c0a313296 [PATCH] hrtimer: ... |
831 832 833 |
} /* |
288867ec5 [hrtimer] Remove ... |
834 835 |
* Insert the timer to the rbtree and check whether it * replaces the first pending timer |
c0a313296 [PATCH] hrtimer: ... |
836 |
*/ |
99bc2fcb2 hrtimer: speedup ... |
837 |
if (leftmost) { |
54cdfdb47 [PATCH] hrtimers:... |
838 839 840 841 842 843 844 845 846 847 848 849 850 |
/* * 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; } |
c0a313296 [PATCH] hrtimer: ... |
851 852 |
rb_link_node(&timer->node, parent, link); rb_insert_color(&timer->node, &base->active); |
303e967ff [PATCH] hrtimers;... |
853 854 855 856 857 |
/* * HRTIMER_STATE_ENQUEUED is or'ed to the current state to preserve the * state of a possibly running callback. */ timer->state |= HRTIMER_STATE_ENQUEUED; |
288867ec5 [hrtimer] Remove ... |
858 |
} |
c0a313296 [PATCH] hrtimer: ... |
859 860 861 862 863 |
/* * __remove_hrtimer - internal function to remove a timer * * Caller must hold the base lock. |
54cdfdb47 [PATCH] hrtimers:... |
864 865 866 867 868 |
* * 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) |
c0a313296 [PATCH] hrtimer: ... |
869 |
*/ |
3c8aa39d7 [PATCH] hrtimers:... |
870 |
static void __remove_hrtimer(struct hrtimer *timer, |
303e967ff [PATCH] hrtimers;... |
871 |
struct hrtimer_clock_base *base, |
54cdfdb47 [PATCH] hrtimers:... |
872 |
unsigned long newstate, int reprogram) |
c0a313296 [PATCH] hrtimer: ... |
873 |
{ |
54cdfdb47 [PATCH] hrtimers:... |
874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 |
/* 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); } |
303e967ff [PATCH] hrtimers;... |
890 |
timer->state = newstate; |
c0a313296 [PATCH] hrtimer: ... |
891 892 893 894 895 896 |
} /* * remove hrtimer, called with base lock held */ static inline int |
3c8aa39d7 [PATCH] hrtimers:... |
897 |
remove_hrtimer(struct hrtimer *timer, struct hrtimer_clock_base *base) |
c0a313296 [PATCH] hrtimer: ... |
898 |
{ |
303e967ff [PATCH] hrtimers;... |
899 |
if (hrtimer_is_queued(timer)) { |
54cdfdb47 [PATCH] hrtimers:... |
900 901 902 903 904 905 906 907 908 909 |
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. */ |
237fc6e7a add hrtimer speci... |
910 |
debug_hrtimer_deactivate(timer); |
82f67cd9f [PATCH] Add debug... |
911 |
timer_stats_hrtimer_clear_start_info(timer); |
54cdfdb47 [PATCH] hrtimers:... |
912 913 914 |
reprogram = base->cpu_base == &__get_cpu_var(hrtimer_bases); __remove_hrtimer(timer, base, HRTIMER_STATE_INACTIVE, reprogram); |
c0a313296 [PATCH] hrtimer: ... |
915 916 917 918 919 920 |
return 1; } return 0; } /** |
e1dd7bc58 hrtimers: fix doc... |
921 |
* hrtimer_start_range_ns - (re)start an hrtimer on the current CPU |
c0a313296 [PATCH] hrtimer: ... |
922 923 |
* @timer: the timer to be added * @tim: expiry time |
da8f2e170 hrtimer: add a hr... |
924 |
* @delta_ns: "slack" range for the timer |
c0a313296 [PATCH] hrtimer: ... |
925 926 927 928 929 930 931 |
* @mode: expiry mode: absolute (HRTIMER_ABS) or relative (HRTIMER_REL) * * Returns: * 0 on success * 1 when the timer was active */ int |
da8f2e170 hrtimer: add a hr... |
932 933 |
hrtimer_start_range_ns(struct hrtimer *timer, ktime_t tim, unsigned long delta_ns, const enum hrtimer_mode mode) |
c0a313296 [PATCH] hrtimer: ... |
934 |
{ |
3c8aa39d7 [PATCH] hrtimers:... |
935 |
struct hrtimer_clock_base *base, *new_base; |
c0a313296 [PATCH] hrtimer: ... |
936 |
unsigned long flags; |
0c96c5979 hrtimer: raise so... |
937 |
int ret, raise; |
c0a313296 [PATCH] hrtimer: ... |
938 939 940 941 942 943 944 945 |
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); |
c9cb2e3d7 [PATCH] hrtimers:... |
946 |
if (mode == HRTIMER_MODE_REL) { |
5a7780e72 hrtimer: check re... |
947 |
tim = ktime_add_safe(tim, new_base->get_time()); |
06027bdd2 [PATCH] hrtimer: ... |
948 949 950 951 952 953 954 955 |
/* * 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 |
5a7780e72 hrtimer: check re... |
956 |
tim = ktime_add_safe(tim, base->resolution); |
06027bdd2 [PATCH] hrtimer: ... |
957 958 |
#endif } |
237fc6e7a add hrtimer speci... |
959 |
|
da8f2e170 hrtimer: add a hr... |
960 |
hrtimer_set_expires_range_ns(timer, tim, delta_ns); |
c0a313296 [PATCH] hrtimer: ... |
961 |
|
82f67cd9f [PATCH] Add debug... |
962 |
timer_stats_hrtimer_set_start_info(timer); |
935c631db [PATCH] hrtimers:... |
963 964 965 966 967 968 |
/* * 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)); |
c0a313296 [PATCH] hrtimer: ... |
969 |
|
0c96c5979 hrtimer: raise so... |
970 971 972 973 974 975 |
/* * 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; |
ee3ece830 hrtimer: prevent ... |
976 977 978 979 980 981 |
/* * 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(); |
c0a313296 [PATCH] hrtimer: ... |
982 |
unlock_hrtimer_base(timer, &flags); |
0c96c5979 hrtimer: raise so... |
983 984 |
if (raise) hrtimer_raise_softirq(); |
ee3ece830 hrtimer: prevent ... |
985 |
preempt_enable(); |
0c96c5979 hrtimer: raise so... |
986 |
|
c0a313296 [PATCH] hrtimer: ... |
987 988 |
return ret; } |
da8f2e170 hrtimer: add a hr... |
989 990 991 |
EXPORT_SYMBOL_GPL(hrtimer_start_range_ns); /** |
e1dd7bc58 hrtimers: fix doc... |
992 |
* hrtimer_start - (re)start an hrtimer on the current CPU |
da8f2e170 hrtimer: add a hr... |
993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 |
* @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) { return hrtimer_start_range_ns(timer, tim, 0, mode); } |
8d16b7642 [PATCH] hrtimer: ... |
1006 |
EXPORT_SYMBOL_GPL(hrtimer_start); |
c0a313296 [PATCH] hrtimer: ... |
1007 |
|
da8f2e170 hrtimer: add a hr... |
1008 |
|
c0a313296 [PATCH] hrtimer: ... |
1009 1010 |
/** * hrtimer_try_to_cancel - try to deactivate a timer |
c0a313296 [PATCH] hrtimer: ... |
1011 1012 1013 1014 1015 1016 |
* @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 |
fa9799e33 [PATCH] ktime/hrt... |
1017 |
* cannot be stopped |
c0a313296 [PATCH] hrtimer: ... |
1018 1019 1020 |
*/ int hrtimer_try_to_cancel(struct hrtimer *timer) { |
3c8aa39d7 [PATCH] hrtimers:... |
1021 |
struct hrtimer_clock_base *base; |
c0a313296 [PATCH] hrtimer: ... |
1022 1023 1024 1025 |
unsigned long flags; int ret = -1; base = lock_hrtimer_base(timer, &flags); |
303e967ff [PATCH] hrtimers;... |
1026 |
if (!hrtimer_callback_running(timer)) |
c0a313296 [PATCH] hrtimer: ... |
1027 1028 1029 1030 1031 1032 1033 |
ret = remove_hrtimer(timer, base); unlock_hrtimer_base(timer, &flags); return ret; } |
8d16b7642 [PATCH] hrtimer: ... |
1034 |
EXPORT_SYMBOL_GPL(hrtimer_try_to_cancel); |
c0a313296 [PATCH] hrtimer: ... |
1035 1036 1037 |
/** * hrtimer_cancel - cancel a timer and wait for the handler to finish. |
c0a313296 [PATCH] hrtimer: ... |
1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 |
* @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; |
5ef37b196 [PATCH] add cpu_r... |
1051 |
cpu_relax(); |
c0a313296 [PATCH] hrtimer: ... |
1052 1053 |
} } |
8d16b7642 [PATCH] hrtimer: ... |
1054 |
EXPORT_SYMBOL_GPL(hrtimer_cancel); |
c0a313296 [PATCH] hrtimer: ... |
1055 1056 1057 |
/** * hrtimer_get_remaining - get remaining time for the timer |
c0a313296 [PATCH] hrtimer: ... |
1058 1059 1060 1061 |
* @timer: the timer to read */ ktime_t hrtimer_get_remaining(const struct hrtimer *timer) { |
3c8aa39d7 [PATCH] hrtimers:... |
1062 |
struct hrtimer_clock_base *base; |
c0a313296 [PATCH] hrtimer: ... |
1063 1064 1065 1066 |
unsigned long flags; ktime_t rem; base = lock_hrtimer_base(timer, &flags); |
cc584b213 hrtimer: convert ... |
1067 |
rem = hrtimer_expires_remaining(timer); |
c0a313296 [PATCH] hrtimer: ... |
1068 1069 1070 1071 |
unlock_hrtimer_base(timer, &flags); return rem; } |
8d16b7642 [PATCH] hrtimer: ... |
1072 |
EXPORT_SYMBOL_GPL(hrtimer_get_remaining); |
c0a313296 [PATCH] hrtimer: ... |
1073 |
|
ee9c57852 dyntick: Remove l... |
1074 |
#ifdef CONFIG_NO_HZ |
69239749e [PATCH] fix next_... |
1075 1076 1077 1078 1079 1080 1081 1082 |
/** * 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) { |
3c8aa39d7 [PATCH] hrtimers:... |
1083 1084 |
struct hrtimer_cpu_base *cpu_base = &__get_cpu_var(hrtimer_bases); struct hrtimer_clock_base *base = cpu_base->clock_base; |
69239749e [PATCH] fix next_... |
1085 1086 1087 |
ktime_t delta, mindelta = { .tv64 = KTIME_MAX }; unsigned long flags; int i; |
3c8aa39d7 [PATCH] hrtimers:... |
1088 |
spin_lock_irqsave(&cpu_base->lock, flags); |
54cdfdb47 [PATCH] hrtimers:... |
1089 1090 1091 |
if (!hrtimer_hres_active()) { for (i = 0; i < HRTIMER_MAX_CLOCK_BASES; i++, base++) { struct hrtimer *timer; |
69239749e [PATCH] fix next_... |
1092 |
|
54cdfdb47 [PATCH] hrtimers:... |
1093 1094 |
if (!base->first) continue; |
3c8aa39d7 [PATCH] hrtimers:... |
1095 |
|
54cdfdb47 [PATCH] hrtimers:... |
1096 |
timer = rb_entry(base->first, struct hrtimer, node); |
cc584b213 hrtimer: convert ... |
1097 |
delta.tv64 = hrtimer_get_expires_tv64(timer); |
54cdfdb47 [PATCH] hrtimers:... |
1098 1099 1100 1101 |
delta = ktime_sub(delta, base->get_time()); if (delta.tv64 < mindelta.tv64) mindelta.tv64 = delta.tv64; } |
69239749e [PATCH] fix next_... |
1102 |
} |
3c8aa39d7 [PATCH] hrtimers:... |
1103 1104 |
spin_unlock_irqrestore(&cpu_base->lock, flags); |
69239749e [PATCH] fix next_... |
1105 1106 1107 1108 1109 |
if (mindelta.tv64 < 0) mindelta.tv64 = 0; return mindelta; } #endif |
237fc6e7a add hrtimer speci... |
1110 1111 |
static void __hrtimer_init(struct hrtimer *timer, clockid_t clock_id, enum hrtimer_mode mode) |
c0a313296 [PATCH] hrtimer: ... |
1112 |
{ |
3c8aa39d7 [PATCH] hrtimers:... |
1113 |
struct hrtimer_cpu_base *cpu_base; |
c0a313296 [PATCH] hrtimer: ... |
1114 |
|
7978672c4 [PATCH] hrtimers:... |
1115 |
memset(timer, 0, sizeof(struct hrtimer)); |
3c8aa39d7 [PATCH] hrtimers:... |
1116 |
cpu_base = &__raw_get_cpu_var(hrtimer_bases); |
c0a313296 [PATCH] hrtimer: ... |
1117 |
|
c9cb2e3d7 [PATCH] hrtimers:... |
1118 |
if (clock_id == CLOCK_REALTIME && mode != HRTIMER_MODE_ABS) |
7978672c4 [PATCH] hrtimers:... |
1119 |
clock_id = CLOCK_MONOTONIC; |
3c8aa39d7 [PATCH] hrtimers:... |
1120 |
timer->base = &cpu_base->clock_base[clock_id]; |
d3d74453c hrtimer: fixup th... |
1121 |
INIT_LIST_HEAD(&timer->cb_entry); |
54cdfdb47 [PATCH] hrtimers:... |
1122 |
hrtimer_init_timer_hres(timer); |
82f67cd9f [PATCH] Add debug... |
1123 1124 1125 1126 1127 1128 |
#ifdef CONFIG_TIMER_STATS timer->start_site = NULL; timer->start_pid = -1; memset(timer->start_comm, 0, TASK_COMM_LEN); #endif |
c0a313296 [PATCH] hrtimer: ... |
1129 |
} |
237fc6e7a add hrtimer speci... |
1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 |
/** * 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); } |
8d16b7642 [PATCH] hrtimer: ... |
1143 |
EXPORT_SYMBOL_GPL(hrtimer_init); |
c0a313296 [PATCH] hrtimer: ... |
1144 1145 1146 |
/** * hrtimer_get_res - get the timer resolution for a clock |
c0a313296 [PATCH] hrtimer: ... |
1147 1148 1149 |
* @which_clock: which clock to query * @tp: pointer to timespec variable to store the resolution * |
72fd4a35a [PATCH] Numerous ... |
1150 1151 |
* Store the resolution of the clock selected by @which_clock in the * variable pointed to by @tp. |
c0a313296 [PATCH] hrtimer: ... |
1152 1153 1154 |
*/ int hrtimer_get_res(const clockid_t which_clock, struct timespec *tp) { |
3c8aa39d7 [PATCH] hrtimers:... |
1155 |
struct hrtimer_cpu_base *cpu_base; |
c0a313296 [PATCH] hrtimer: ... |
1156 |
|
3c8aa39d7 [PATCH] hrtimers:... |
1157 1158 |
cpu_base = &__raw_get_cpu_var(hrtimer_bases); *tp = ktime_to_timespec(cpu_base->clock_base[which_clock].resolution); |
c0a313296 [PATCH] hrtimer: ... |
1159 1160 1161 |
return 0; } |
8d16b7642 [PATCH] hrtimer: ... |
1162 |
EXPORT_SYMBOL_GPL(hrtimer_get_res); |
c0a313296 [PATCH] hrtimer: ... |
1163 |
|
d3d74453c hrtimer: fixup th... |
1164 1165 1166 1167 1168 1169 1170 1171 |
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; |
5d5254f0d timers: handle HR... |
1172 |
int emulate_hardirq_ctx = 0; |
d3d74453c hrtimer: fixup th... |
1173 1174 1175 |
timer = list_entry(cpu_base->cb_pending.next, struct hrtimer, cb_entry); |
237fc6e7a add hrtimer speci... |
1176 |
debug_hrtimer_deactivate(timer); |
d3d74453c hrtimer: fixup th... |
1177 1178 1179 |
timer_stats_account_hrtimer(timer); fn = timer->function; |
5d5254f0d timers: handle HR... |
1180 1181 1182 1183 1184 1185 1186 1187 |
/* * A timer might have been added to the cb_pending list * when it was migrated during a cpu-offline operation. * Emulate hardirq context for such timers. */ if (timer->cb_mode == HRTIMER_CB_IRQSAFE_PERCPU || timer->cb_mode == HRTIMER_CB_IRQSAFE_UNLOCKED) emulate_hardirq_ctx = 1; |
d3d74453c hrtimer: fixup th... |
1188 1189 |
__remove_hrtimer(timer, timer->base, HRTIMER_STATE_CALLBACK, 0); spin_unlock_irq(&cpu_base->lock); |
5d5254f0d timers: handle HR... |
1190 1191 1192 1193 1194 1195 |
if (unlikely(emulate_hardirq_ctx)) { local_irq_disable(); restart = fn(timer); local_irq_enable(); } else restart = fn(timer); |
d3d74453c hrtimer: fixup th... |
1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 |
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. */ |
d7b41a24b hrtimer: timeout ... |
1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 |
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); } |
d3d74453c hrtimer: fixup th... |
1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 |
} } 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; |
237fc6e7a add hrtimer speci... |
1236 |
debug_hrtimer_deactivate(timer); |
d3d74453c hrtimer: fixup th... |
1237 1238 1239 1240 |
__remove_hrtimer(timer, base, HRTIMER_STATE_CALLBACK, 0); timer_stats_account_hrtimer(timer); fn = timer->function; |
ccc7dadf7 hrtimer: prevent ... |
1241 1242 |
if (timer->cb_mode == HRTIMER_CB_IRQSAFE_PERCPU || timer->cb_mode == HRTIMER_CB_IRQSAFE_UNLOCKED) { |
d3d74453c hrtimer: fixup th... |
1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 |
/* * 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; } |
54cdfdb47 [PATCH] hrtimers:... |
1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 |
#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); |
654c8e0b1 hrtimer: turn hrt... |
1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 |
/* * 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)) { |
54cdfdb47 [PATCH] hrtimers:... |
1317 |
ktime_t expires; |
cc584b213 hrtimer: convert ... |
1318 |
expires = ktime_sub(hrtimer_get_expires(timer), |
54cdfdb47 [PATCH] hrtimers:... |
1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 |
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; } |
d3d74453c hrtimer: fixup th... |
1334 |
__run_hrtimer(timer); |
54cdfdb47 [PATCH] hrtimers:... |
1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 |
} 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); } |
2e94d1f71 hrtimer: peek at ... |
1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 |
/** * hrtimer_peek_ahead_timers -- run soft-expired timers now * * hrtimer_peek_ahead_timers will peek at the timer queue of * the current cpu and check if there are any timers for which * the soft expires time has passed. If any such timers exist, * they are run immediately and then removed from the timer queue. * */ void hrtimer_peek_ahead_timers(void) { |
2e94d1f71 hrtimer: peek at ... |
1363 |
struct tick_device *td; |
643bdf68f hrtimers: simplif... |
1364 |
unsigned long flags; |
dc4304f7d rangetimers: fix ... |
1365 1366 |
if (!hrtimer_hres_active()) |
2e94d1f71 hrtimer: peek at ... |
1367 1368 1369 1370 |
return; local_irq_save(flags); td = &__get_cpu_var(tick_cpu_device); |
643bdf68f hrtimers: simplif... |
1371 1372 |
if (td && td->evtdev) hrtimer_interrupt(td->evtdev); |
2e94d1f71 hrtimer: peek at ... |
1373 1374 |
local_irq_restore(flags); } |
54cdfdb47 [PATCH] hrtimers:... |
1375 1376 |
static void run_hrtimer_softirq(struct softirq_action *h) { |
d3d74453c hrtimer: fixup th... |
1377 1378 |
run_hrtimer_pending(&__get_cpu_var(hrtimer_bases)); } |
54cdfdb47 [PATCH] hrtimers:... |
1379 |
|
d3d74453c hrtimer: fixup th... |
1380 |
#endif /* CONFIG_HIGH_RES_TIMERS */ |
82f67cd9f [PATCH] Add debug... |
1381 |
|
d3d74453c hrtimer: fixup th... |
1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 |
/* * 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); |
54cdfdb47 [PATCH] hrtimers:... |
1392 |
|
d3d74453c hrtimer: fixup th... |
1393 1394 |
if (hrtimer_hres_active()) return; |
54cdfdb47 [PATCH] hrtimers:... |
1395 |
|
d3d74453c hrtimer: fixup th... |
1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 |
/* * 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(); |
54cdfdb47 [PATCH] hrtimers:... |
1406 |
|
d3d74453c hrtimer: fixup th... |
1407 |
run_hrtimer_pending(cpu_base); |
54cdfdb47 [PATCH] hrtimers:... |
1408 |
} |
c0a313296 [PATCH] hrtimer: ... |
1409 |
/* |
d3d74453c hrtimer: fixup th... |
1410 |
* Called from hardirq context every jiffy |
c0a313296 [PATCH] hrtimer: ... |
1411 |
*/ |
833883d9a hrtimer: reduce c... |
1412 |
void hrtimer_run_queues(void) |
c0a313296 [PATCH] hrtimer: ... |
1413 |
{ |
288867ec5 [hrtimer] Remove ... |
1414 |
struct rb_node *node; |
833883d9a hrtimer: reduce c... |
1415 1416 1417 |
struct hrtimer_cpu_base *cpu_base = &__get_cpu_var(hrtimer_bases); struct hrtimer_clock_base *base; int index, gettime = 1; |
c0a313296 [PATCH] hrtimer: ... |
1418 |
|
833883d9a hrtimer: reduce c... |
1419 |
if (hrtimer_hres_active()) |
3055addad [PATCH] hrtimer: ... |
1420 |
return; |
833883d9a hrtimer: reduce c... |
1421 1422 |
for (index = 0; index < HRTIMER_MAX_CLOCK_BASES; index++) { base = &cpu_base->clock_base[index]; |
c0a313296 [PATCH] hrtimer: ... |
1423 |
|
833883d9a hrtimer: reduce c... |
1424 |
if (!base->first) |
d3d74453c hrtimer: fixup th... |
1425 |
continue; |
833883d9a hrtimer: reduce c... |
1426 |
|
d7cfb60c5 hrtimer: remove h... |
1427 |
if (gettime) { |
833883d9a hrtimer: reduce c... |
1428 1429 |
hrtimer_get_softirq_time(cpu_base); gettime = 0; |
b75f7a51c [PATCH] hrtimers:... |
1430 |
} |
d3d74453c hrtimer: fixup th... |
1431 |
|
833883d9a hrtimer: reduce c... |
1432 |
spin_lock(&cpu_base->lock); |
c0a313296 [PATCH] hrtimer: ... |
1433 |
|
833883d9a hrtimer: reduce c... |
1434 1435 |
while ((node = base->first)) { struct hrtimer *timer; |
54cdfdb47 [PATCH] hrtimers:... |
1436 |
|
833883d9a hrtimer: reduce c... |
1437 |
timer = rb_entry(node, struct hrtimer, node); |
cc584b213 hrtimer: convert ... |
1438 1439 |
if (base->softirq_time.tv64 <= hrtimer_get_expires_tv64(timer)) |
833883d9a hrtimer: reduce c... |
1440 1441 1442 1443 1444 1445 1446 1447 1448 |
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; } |
92127c7a4 [PATCH] hrtimers:... |
1449 |
|
833883d9a hrtimer: reduce c... |
1450 1451 1452 1453 |
__run_hrtimer(timer); } spin_unlock(&cpu_base->lock); } |
c0a313296 [PATCH] hrtimer: ... |
1454 1455 1456 |
} /* |
10c94ec16 [PATCH] hrtimer: ... |
1457 1458 |
* Sleep related functions: */ |
c9cb2e3d7 [PATCH] hrtimers:... |
1459 |
static enum hrtimer_restart hrtimer_wakeup(struct hrtimer *timer) |
00362e33f [PATCH] hrtimer: ... |
1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 |
{ 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; } |
36c8b5868 [PATCH] sched: cl... |
1471 |
void hrtimer_init_sleeper(struct hrtimer_sleeper *sl, struct task_struct *task) |
00362e33f [PATCH] hrtimer: ... |
1472 1473 1474 |
{ sl->timer.function = hrtimer_wakeup; sl->task = task; |
54cdfdb47 [PATCH] hrtimers:... |
1475 |
#ifdef CONFIG_HIGH_RES_TIMERS |
ccc7dadf7 hrtimer: prevent ... |
1476 |
sl->timer.cb_mode = HRTIMER_CB_IRQSAFE_UNLOCKED; |
54cdfdb47 [PATCH] hrtimers:... |
1477 |
#endif |
00362e33f [PATCH] hrtimer: ... |
1478 |
} |
669d7868a [PATCH] hrtimer: ... |
1479 |
static int __sched do_nanosleep(struct hrtimer_sleeper *t, enum hrtimer_mode mode) |
432569bb9 [PATCH] hrtimers:... |
1480 |
{ |
669d7868a [PATCH] hrtimer: ... |
1481 |
hrtimer_init_sleeper(t, current); |
10c94ec16 [PATCH] hrtimer: ... |
1482 |
|
432569bb9 [PATCH] hrtimers:... |
1483 1484 |
do { set_current_state(TASK_INTERRUPTIBLE); |
cc584b213 hrtimer: convert ... |
1485 |
hrtimer_start_expires(&t->timer, mode); |
37bb6cb40 hrtimer: unlock h... |
1486 1487 |
if (!hrtimer_active(&t->timer)) t->task = NULL; |
432569bb9 [PATCH] hrtimers:... |
1488 |
|
54cdfdb47 [PATCH] hrtimers:... |
1489 1490 |
if (likely(t->task)) schedule(); |
432569bb9 [PATCH] hrtimers:... |
1491 |
|
669d7868a [PATCH] hrtimer: ... |
1492 |
hrtimer_cancel(&t->timer); |
c9cb2e3d7 [PATCH] hrtimers:... |
1493 |
mode = HRTIMER_MODE_ABS; |
669d7868a [PATCH] hrtimer: ... |
1494 1495 |
} while (t->task && !signal_pending(current)); |
432569bb9 [PATCH] hrtimers:... |
1496 |
|
3588a085c hrtimer: fix hrti... |
1497 |
__set_current_state(TASK_RUNNING); |
669d7868a [PATCH] hrtimer: ... |
1498 |
return t->task == NULL; |
10c94ec16 [PATCH] hrtimer: ... |
1499 |
} |
080344b98 hrtimer: fix *rmt... |
1500 1501 1502 1503 |
static int update_rmtp(struct hrtimer *timer, struct timespec __user *rmtp) { struct timespec rmt; ktime_t rem; |
cc584b213 hrtimer: convert ... |
1504 |
rem = hrtimer_expires_remaining(timer); |
080344b98 hrtimer: fix *rmt... |
1505 1506 1507 1508 1509 1510 1511 1512 1513 |
if (rem.tv64 <= 0) return 0; rmt = ktime_to_timespec(rem); if (copy_to_user(rmtp, &rmt, sizeof(*rmtp))) return -EFAULT; return 1; } |
1711ef386 [PATCH] posix-tim... |
1514 |
long __sched hrtimer_nanosleep_restart(struct restart_block *restart) |
10c94ec16 [PATCH] hrtimer: ... |
1515 |
{ |
669d7868a [PATCH] hrtimer: ... |
1516 |
struct hrtimer_sleeper t; |
080344b98 hrtimer: fix *rmt... |
1517 |
struct timespec __user *rmtp; |
237fc6e7a add hrtimer speci... |
1518 |
int ret = 0; |
10c94ec16 [PATCH] hrtimer: ... |
1519 |
|
237fc6e7a add hrtimer speci... |
1520 1521 |
hrtimer_init_on_stack(&t.timer, restart->nanosleep.index, HRTIMER_MODE_ABS); |
cc584b213 hrtimer: convert ... |
1522 |
hrtimer_set_expires_tv64(&t.timer, restart->nanosleep.expires); |
10c94ec16 [PATCH] hrtimer: ... |
1523 |
|
c9cb2e3d7 [PATCH] hrtimers:... |
1524 |
if (do_nanosleep(&t, HRTIMER_MODE_ABS)) |
237fc6e7a add hrtimer speci... |
1525 |
goto out; |
10c94ec16 [PATCH] hrtimer: ... |
1526 |
|
029a07e03 hrtimer: use nano... |
1527 |
rmtp = restart->nanosleep.rmtp; |
432569bb9 [PATCH] hrtimers:... |
1528 |
if (rmtp) { |
237fc6e7a add hrtimer speci... |
1529 |
ret = update_rmtp(&t.timer, rmtp); |
080344b98 hrtimer: fix *rmt... |
1530 |
if (ret <= 0) |
237fc6e7a add hrtimer speci... |
1531 |
goto out; |
432569bb9 [PATCH] hrtimers:... |
1532 |
} |
10c94ec16 [PATCH] hrtimer: ... |
1533 |
|
10c94ec16 [PATCH] hrtimer: ... |
1534 |
/* The other values in restart are already filled in */ |
237fc6e7a add hrtimer speci... |
1535 1536 1537 1538 |
ret = -ERESTART_RESTARTBLOCK; out: destroy_hrtimer_on_stack(&t.timer); return ret; |
10c94ec16 [PATCH] hrtimer: ... |
1539 |
} |
080344b98 hrtimer: fix *rmt... |
1540 |
long hrtimer_nanosleep(struct timespec *rqtp, struct timespec __user *rmtp, |
10c94ec16 [PATCH] hrtimer: ... |
1541 1542 1543 |
const enum hrtimer_mode mode, const clockid_t clockid) { struct restart_block *restart; |
669d7868a [PATCH] hrtimer: ... |
1544 |
struct hrtimer_sleeper t; |
237fc6e7a add hrtimer speci... |
1545 |
int ret = 0; |
3bd012060 hrtimer: make the... |
1546 1547 1548 1549 1550 |
unsigned long slack; slack = current->timer_slack_ns; if (rt_task(current)) slack = 0; |
10c94ec16 [PATCH] hrtimer: ... |
1551 |
|
237fc6e7a add hrtimer speci... |
1552 |
hrtimer_init_on_stack(&t.timer, clockid, mode); |
3bd012060 hrtimer: make the... |
1553 |
hrtimer_set_expires_range_ns(&t.timer, timespec_to_ktime(*rqtp), slack); |
432569bb9 [PATCH] hrtimers:... |
1554 |
if (do_nanosleep(&t, mode)) |
237fc6e7a add hrtimer speci... |
1555 |
goto out; |
10c94ec16 [PATCH] hrtimer: ... |
1556 |
|
7978672c4 [PATCH] hrtimers:... |
1557 |
/* Absolute timers do not update the rmtp value and restart: */ |
237fc6e7a add hrtimer speci... |
1558 1559 1560 1561 |
if (mode == HRTIMER_MODE_ABS) { ret = -ERESTARTNOHAND; goto out; } |
10c94ec16 [PATCH] hrtimer: ... |
1562 |
|
432569bb9 [PATCH] hrtimers:... |
1563 |
if (rmtp) { |
237fc6e7a add hrtimer speci... |
1564 |
ret = update_rmtp(&t.timer, rmtp); |
080344b98 hrtimer: fix *rmt... |
1565 |
if (ret <= 0) |
237fc6e7a add hrtimer speci... |
1566 |
goto out; |
432569bb9 [PATCH] hrtimers:... |
1567 |
} |
10c94ec16 [PATCH] hrtimer: ... |
1568 1569 |
restart = ¤t_thread_info()->restart_block; |
1711ef386 [PATCH] posix-tim... |
1570 |
restart->fn = hrtimer_nanosleep_restart; |
029a07e03 hrtimer: use nano... |
1571 1572 |
restart->nanosleep.index = t.timer.base->index; restart->nanosleep.rmtp = rmtp; |
cc584b213 hrtimer: convert ... |
1573 |
restart->nanosleep.expires = hrtimer_get_expires_tv64(&t.timer); |
10c94ec16 [PATCH] hrtimer: ... |
1574 |
|
237fc6e7a add hrtimer speci... |
1575 1576 1577 1578 |
ret = -ERESTART_RESTARTBLOCK; out: destroy_hrtimer_on_stack(&t.timer); return ret; |
10c94ec16 [PATCH] hrtimer: ... |
1579 |
} |
6ba1b9121 [PATCH] hrtimer: ... |
1580 1581 1582 |
asmlinkage long sys_nanosleep(struct timespec __user *rqtp, struct timespec __user *rmtp) { |
080344b98 hrtimer: fix *rmt... |
1583 |
struct timespec tu; |
6ba1b9121 [PATCH] hrtimer: ... |
1584 1585 1586 1587 1588 1589 |
if (copy_from_user(&tu, rqtp, sizeof(tu))) return -EFAULT; if (!timespec_valid(&tu)) return -EINVAL; |
080344b98 hrtimer: fix *rmt... |
1590 |
return hrtimer_nanosleep(&tu, rmtp, HRTIMER_MODE_REL, CLOCK_MONOTONIC); |
6ba1b9121 [PATCH] hrtimer: ... |
1591 |
} |
10c94ec16 [PATCH] hrtimer: ... |
1592 |
/* |
c0a313296 [PATCH] hrtimer: ... |
1593 1594 |
* Functions related to boot-time initialization: */ |
0ec160dd4 hrtimer: fix sect... |
1595 |
static void __cpuinit init_hrtimers_cpu(int cpu) |
c0a313296 [PATCH] hrtimer: ... |
1596 |
{ |
3c8aa39d7 [PATCH] hrtimers:... |
1597 |
struct hrtimer_cpu_base *cpu_base = &per_cpu(hrtimer_bases, cpu); |
c0a313296 [PATCH] hrtimer: ... |
1598 |
int i; |
3c8aa39d7 [PATCH] hrtimers:... |
1599 |
spin_lock_init(&cpu_base->lock); |
3c8aa39d7 [PATCH] hrtimers:... |
1600 1601 1602 |
for (i = 0; i < HRTIMER_MAX_CLOCK_BASES; i++) cpu_base->clock_base[i].cpu_base = cpu_base; |
d3d74453c hrtimer: fixup th... |
1603 |
INIT_LIST_HEAD(&cpu_base->cb_pending); |
54cdfdb47 [PATCH] hrtimers:... |
1604 |
hrtimer_init_hres(cpu_base); |
c0a313296 [PATCH] hrtimer: ... |
1605 1606 1607 |
} #ifdef CONFIG_HOTPLUG_CPU |
41e1022ea hrtimer: fix migr... |
1608 |
static int migrate_hrtimer_list(struct hrtimer_clock_base *old_base, |
ccc7dadf7 hrtimer: prevent ... |
1609 |
struct hrtimer_clock_base *new_base, int dcpu) |
c0a313296 [PATCH] hrtimer: ... |
1610 1611 1612 |
{ struct hrtimer *timer; struct rb_node *node; |
41e1022ea hrtimer: fix migr... |
1613 |
int raise = 0; |
c0a313296 [PATCH] hrtimer: ... |
1614 1615 1616 |
while ((node = rb_first(&old_base->active))) { timer = rb_entry(node, struct hrtimer, node); |
54cdfdb47 [PATCH] hrtimers:... |
1617 |
BUG_ON(hrtimer_callback_running(timer)); |
237fc6e7a add hrtimer speci... |
1618 |
debug_hrtimer_deactivate(timer); |
b00c1a99e hrtimer: mark mig... |
1619 1620 |
/* |
ccc7dadf7 hrtimer: prevent ... |
1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 |
* Should not happen. Per CPU timers should be * canceled _before_ the migration code is called */ if (timer->cb_mode == HRTIMER_CB_IRQSAFE_PERCPU) { __remove_hrtimer(timer, old_base, HRTIMER_STATE_INACTIVE, 0); WARN(1, "hrtimer (%p %p)active but cpu %d dead ", timer, timer->function, dcpu); continue; } /* |
b00c1a99e hrtimer: mark mig... |
1634 1635 1636 1637 1638 |
* Mark it as STATE_MIGRATE not INACTIVE otherwise the * timer could be seen as !active and just vanish away * under us on another CPU */ __remove_hrtimer(timer, old_base, HRTIMER_STATE_MIGRATE, 0); |
c0a313296 [PATCH] hrtimer: ... |
1639 |
timer->base = new_base; |
54cdfdb47 [PATCH] hrtimers:... |
1640 1641 1642 1643 |
/* * Enqueue the timer. Allow reprogramming of the event device */ enqueue_hrtimer(timer, new_base, 1); |
41e1022ea hrtimer: fix migr... |
1644 1645 1646 1647 1648 |
#ifdef CONFIG_HIGH_RES_TIMERS /* * Happens with high res enabled when the timer was * already expired and the callback mode is |
ccc7dadf7 hrtimer: prevent ... |
1649 1650 1651 1652 1653 |
* HRTIMER_CB_IRQSAFE_UNLOCKED (hrtimer_sleeper). The * enqueue code does not move them to the soft irq * pending list for performance/latency reasons, but * in the migration state, we need to do that * otherwise we end up with a stale timer. |
41e1022ea hrtimer: fix migr... |
1654 |
*/ |
b00c1a99e hrtimer: mark mig... |
1655 |
if (timer->state == HRTIMER_STATE_MIGRATE) { |
41e1022ea hrtimer: fix migr... |
1656 1657 1658 1659 1660 1661 |
timer->state = HRTIMER_STATE_PENDING; list_add_tail(&timer->cb_entry, &new_base->cpu_base->cb_pending); raise = 1; } #endif |
b00c1a99e hrtimer: mark mig... |
1662 1663 |
/* Clear the migration state bit */ timer->state &= ~HRTIMER_STATE_MIGRATE; |
c0a313296 [PATCH] hrtimer: ... |
1664 |
} |
41e1022ea hrtimer: fix migr... |
1665 |
return raise; |
c0a313296 [PATCH] hrtimer: ... |
1666 |
} |
7659e3496 hrtimer: migrate ... |
1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 |
#ifdef CONFIG_HIGH_RES_TIMERS static int migrate_hrtimer_pending(struct hrtimer_cpu_base *old_base, struct hrtimer_cpu_base *new_base) { struct hrtimer *timer; int raise = 0; while (!list_empty(&old_base->cb_pending)) { timer = list_entry(old_base->cb_pending.next, struct hrtimer, cb_entry); __remove_hrtimer(timer, timer->base, HRTIMER_STATE_PENDING, 0); timer->base = &new_base->clock_base[timer->base->index]; list_add_tail(&timer->cb_entry, &new_base->cb_pending); raise = 1; |
c0a313296 [PATCH] hrtimer: ... |
1682 |
} |
7659e3496 hrtimer: migrate ... |
1683 1684 1685 1686 1687 1688 1689 |
return raise; } #else static int migrate_hrtimer_pending(struct hrtimer_cpu_base *old_base, struct hrtimer_cpu_base *new_base) { return 0; |
c0a313296 [PATCH] hrtimer: ... |
1690 |
} |
7659e3496 hrtimer: migrate ... |
1691 |
#endif |
c0a313296 [PATCH] hrtimer: ... |
1692 1693 1694 |
static void migrate_hrtimers(int cpu) { |
3c8aa39d7 [PATCH] hrtimers:... |
1695 |
struct hrtimer_cpu_base *old_base, *new_base; |
7659e3496 hrtimer: migrate ... |
1696 |
int i, raise = 0; |
c0a313296 [PATCH] hrtimer: ... |
1697 1698 |
BUG_ON(cpu_online(cpu)); |
3c8aa39d7 [PATCH] hrtimers:... |
1699 1700 |
old_base = &per_cpu(hrtimer_bases, cpu); new_base = &get_cpu_var(hrtimer_bases); |
c0a313296 [PATCH] hrtimer: ... |
1701 |
|
54cdfdb47 [PATCH] hrtimers:... |
1702 |
tick_cancel_sched_timer(cpu); |
d82f0b0f6 migrate_timers: a... |
1703 1704 1705 1706 1707 |
/* * The caller is globally serialized and nobody else * takes two locks at once, deadlock is not possible. */ spin_lock_irq(&new_base->lock); |
8e60e05fd hrtimers: simplif... |
1708 |
spin_lock_nested(&old_base->lock, SINGLE_DEPTH_NESTING); |
c0a313296 [PATCH] hrtimer: ... |
1709 |
|
3c8aa39d7 [PATCH] hrtimers:... |
1710 |
for (i = 0; i < HRTIMER_MAX_CLOCK_BASES; i++) { |
41e1022ea hrtimer: fix migr... |
1711 |
if (migrate_hrtimer_list(&old_base->clock_base[i], |
ccc7dadf7 hrtimer: prevent ... |
1712 |
&new_base->clock_base[i], cpu)) |
41e1022ea hrtimer: fix migr... |
1713 |
raise = 1; |
c0a313296 [PATCH] hrtimer: ... |
1714 |
} |
7659e3496 hrtimer: migrate ... |
1715 1716 |
if (migrate_hrtimer_pending(old_base, new_base)) raise = 1; |
8e60e05fd hrtimers: simplif... |
1717 |
spin_unlock(&old_base->lock); |
d82f0b0f6 migrate_timers: a... |
1718 |
spin_unlock_irq(&new_base->lock); |
c0a313296 [PATCH] hrtimer: ... |
1719 |
put_cpu_var(hrtimer_bases); |
7659e3496 hrtimer: migrate ... |
1720 1721 1722 |
if (raise) hrtimer_raise_softirq(); |
c0a313296 [PATCH] hrtimer: ... |
1723 1724 |
} #endif /* CONFIG_HOTPLUG_CPU */ |
8c78f3075 [PATCH] cpu hotpl... |
1725 |
static int __cpuinit hrtimer_cpu_notify(struct notifier_block *self, |
c0a313296 [PATCH] hrtimer: ... |
1726 1727 |
unsigned long action, void *hcpu) { |
7713a7d19 [HRTIMER] Fix cpu... |
1728 |
unsigned int cpu = (long)hcpu; |
c0a313296 [PATCH] hrtimer: ... |
1729 1730 1731 1732 |
switch (action) { case CPU_UP_PREPARE: |
8bb784428 Add suspend-relat... |
1733 |
case CPU_UP_PREPARE_FROZEN: |
c0a313296 [PATCH] hrtimer: ... |
1734 1735 1736 1737 1738 |
init_hrtimers_cpu(cpu); break; #ifdef CONFIG_HOTPLUG_CPU case CPU_DEAD: |
8bb784428 Add suspend-relat... |
1739 |
case CPU_DEAD_FROZEN: |
d316c57ff [PATCH] clockeven... |
1740 |
clockevents_notify(CLOCK_EVT_NOTIFY_CPU_DEAD, &cpu); |
c0a313296 [PATCH] hrtimer: ... |
1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 |
migrate_hrtimers(cpu); break; #endif default: break; } return NOTIFY_OK; } |
8c78f3075 [PATCH] cpu hotpl... |
1751 |
static struct notifier_block __cpuinitdata hrtimers_nb = { |
c0a313296 [PATCH] hrtimer: ... |
1752 1753 1754 1755 1756 1757 1758 1759 |
.notifier_call = hrtimer_cpu_notify, }; void __init hrtimers_init(void) { hrtimer_cpu_notify(&hrtimers_nb, (unsigned long)CPU_UP_PREPARE, (void *)(long)smp_processor_id()); register_cpu_notifier(&hrtimers_nb); |
54cdfdb47 [PATCH] hrtimers:... |
1760 |
#ifdef CONFIG_HIGH_RES_TIMERS |
962cf36c5 Remove argument f... |
1761 |
open_softirq(HRTIMER_SOFTIRQ, run_hrtimer_softirq); |
54cdfdb47 [PATCH] hrtimers:... |
1762 |
#endif |
c0a313296 [PATCH] hrtimer: ... |
1763 |
} |
7bb67439b select: Introduce... |
1764 |
/** |
654c8e0b1 hrtimer: turn hrt... |
1765 |
* schedule_hrtimeout_range - sleep until timeout |
7bb67439b select: Introduce... |
1766 |
* @expires: timeout value (ktime_t) |
654c8e0b1 hrtimer: turn hrt... |
1767 |
* @delta: slack in expires timeout (ktime_t) |
7bb67439b select: Introduce... |
1768 1769 1770 1771 1772 1773 |
* @mode: timer mode, HRTIMER_MODE_ABS or HRTIMER_MODE_REL * * Make the current task sleep until the given expiry time has * elapsed. The routine will return immediately unless * the current task state has been set (see set_current_state()). * |
654c8e0b1 hrtimer: turn hrt... |
1774 1775 1776 1777 1778 |
* The @delta argument gives the kernel the freedom to schedule the * actual wakeup to a time that is both power and performance friendly. * The kernel give the normal best effort behavior for "@expires+@delta", * but may decide to fire the timer earlier, but no earlier than @expires. * |
7bb67439b select: Introduce... |
1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 |
* You can set the task state as follows - * * %TASK_UNINTERRUPTIBLE - at least @timeout time is guaranteed to * pass before the routine returns. * * %TASK_INTERRUPTIBLE - the routine may return early if a signal is * delivered to the current task. * * The current task state is guaranteed to be TASK_RUNNING when this * routine returns. * * Returns 0 when the timer has expired otherwise -EINTR */ |
654c8e0b1 hrtimer: turn hrt... |
1792 |
int __sched schedule_hrtimeout_range(ktime_t *expires, unsigned long delta, |
7bb67439b select: Introduce... |
1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 |
const enum hrtimer_mode mode) { struct hrtimer_sleeper t; /* * Optimize when a zero timeout value is given. It does not * matter whether this is an absolute or a relative time. */ if (expires && !expires->tv64) { __set_current_state(TASK_RUNNING); return 0; } /* * A NULL parameter means "inifinte" */ if (!expires) { schedule(); __set_current_state(TASK_RUNNING); return -EINTR; } hrtimer_init_on_stack(&t.timer, CLOCK_MONOTONIC, mode); |
654c8e0b1 hrtimer: turn hrt... |
1816 |
hrtimer_set_expires_range_ns(&t.timer, *expires, delta); |
7bb67439b select: Introduce... |
1817 1818 |
hrtimer_init_sleeper(&t, current); |
cc584b213 hrtimer: convert ... |
1819 |
hrtimer_start_expires(&t.timer, mode); |
7bb67439b select: Introduce... |
1820 1821 1822 1823 1824 1825 1826 1827 1828 1829 1830 1831 1832 |
if (!hrtimer_active(&t.timer)) t.task = NULL; if (likely(t.task)) schedule(); hrtimer_cancel(&t.timer); destroy_hrtimer_on_stack(&t.timer); __set_current_state(TASK_RUNNING); return !t.task ? 0 : -EINTR; } |
654c8e0b1 hrtimer: turn hrt... |
1833 1834 1835 1836 1837 1838 1839 1840 1841 1842 1843 1844 1845 1846 1847 1848 1849 1850 1851 1852 1853 1854 1855 1856 1857 1858 1859 1860 1861 |
EXPORT_SYMBOL_GPL(schedule_hrtimeout_range); /** * schedule_hrtimeout - sleep until timeout * @expires: timeout value (ktime_t) * @mode: timer mode, HRTIMER_MODE_ABS or HRTIMER_MODE_REL * * Make the current task sleep until the given expiry time has * elapsed. The routine will return immediately unless * the current task state has been set (see set_current_state()). * * You can set the task state as follows - * * %TASK_UNINTERRUPTIBLE - at least @timeout time is guaranteed to * pass before the routine returns. * * %TASK_INTERRUPTIBLE - the routine may return early if a signal is * delivered to the current task. * * The current task state is guaranteed to be TASK_RUNNING when this * routine returns. * * Returns 0 when the timer has expired otherwise -EINTR */ int __sched schedule_hrtimeout(ktime_t *expires, const enum hrtimer_mode mode) { return schedule_hrtimeout_range(expires, 0, mode); } |
7bb67439b select: Introduce... |
1862 |
EXPORT_SYMBOL_GPL(schedule_hrtimeout); |