예제 #1
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
	}

	timer->expires = 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;

	unlock_hrtimer_base(timer, &flags);

	if (raise)
		hrtimer_raise_softirq();

	return ret;
}
예제 #2
0
파일: hrtimer.c 프로젝트: DenisLug/mptcp
/**
 * hrtimer_start_range_ns - (re)start an hrtimer on the current CPU
 * @timer:	the timer to be added
 * @tim:	expiry time
 * @delta_ns:	"slack" range for the timer
 * @mode:	expiry mode: absolute (HRTIMER_MODE_ABS) or
 *		relative (HRTIMER_MODE_REL)
 */
void hrtimer_start_range_ns(struct hrtimer *timer, ktime_t tim,
			    unsigned long delta_ns, const enum hrtimer_mode mode)
{
	struct hrtimer_clock_base *base, *new_base;
	unsigned long flags;
	int leftmost;

	base = lock_hrtimer_base(timer, &flags);

	/* Remove an active timer from the queue: */
	remove_hrtimer(timer, base, true);

	if (mode & HRTIMER_MODE_REL) {
		tim = ktime_add_safe(tim, 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, ktime_set(0, hrtimer_resolution));
#endif
	}

	hrtimer_set_expires_range_ns(timer, tim, delta_ns);

	/* Switch the timer base, if necessary: */
	new_base = switch_hrtimer_base(timer, base, mode & HRTIMER_MODE_PINNED);

	timer_stats_hrtimer_set_start_info(timer);

	leftmost = enqueue_hrtimer(timer, new_base);
	if (!leftmost)
		goto unlock;

	if (!hrtimer_is_hres_active(timer)) {
		/*
		 * Kick to reschedule the next tick to handle the new timer
		 * on dynticks target.
		 */
		if (new_base->cpu_base->nohz_active)
			wake_up_nohz_cpu(new_base->cpu_base->cpu);
	} else {
		hrtimer_reprogram(timer, new_base);
	}
unlock:
	unlock_hrtimer_base(timer, &flags);
}
예제 #3
0
int __hrtimer_start_range_ns(struct hrtimer *timer, ktime_t tim,
		unsigned long delta_ns, const enum hrtimer_mode mode,
		int wakeup)
{
	struct hrtimer_clock_base *base, *new_base;
	unsigned long flags;
	int ret, leftmost;

	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, mode & HRTIMER_MODE_PINNED);

	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_range_ns(timer, tim, delta_ns);

	timer_stats_hrtimer_set_start_info(timer);

	leftmost = enqueue_hrtimer(timer, new_base);

	/*
	 * Only allow reprogramming if the new base is on this CPU.
	 * (it might still be on another CPU if the timer was pending)
	 *
	 * XXX send_remote_softirq() ?
	 */
	if (leftmost && new_base->cpu_base == &__get_cpu_var(hrtimer_bases))
		hrtimer_enqueue_reprogram(timer, new_base, wakeup);

	unlock_hrtimer_base(timer, &flags);

	return ret;
}
예제 #4
0
asmlinkage long compat_sys_futex(u32 __user *uaddr, int op, u32 val,
		struct compat_timespec __user *utime, u32 __user *uaddr2,
		u32 val3)
{
	struct timespec ts;
	ktime_t t, *tp = NULL;
	int val2 = 0;
	int cmd = op & FUTEX_CMD_MASK;

	if (utime && (cmd == FUTEX_WAIT || cmd == FUTEX_LOCK_PI ||
		      cmd == FUTEX_WAIT_BITSET ||
		      cmd == FUTEX_WAIT_REQUEUE_PI)) {
		if (get_compat_timespec(&ts, utime))
			return -EFAULT;
		if (!timespec_valid(&ts))
			return -EINVAL;

		t = timespec_to_ktime(ts);
		if (cmd == FUTEX_WAIT)
			t = ktime_add_safe(ktime_get(), t);
		tp = &t;
	}
	if (cmd == FUTEX_REQUEUE || cmd == FUTEX_CMP_REQUEUE ||
	    cmd == FUTEX_CMP_REQUEUE_PI || cmd == FUTEX_WAKE_OP)
		val2 = (int) (unsigned long) utime;

	return do_futex(uaddr, op, val, tp, uaddr2, val2, val3);
}
예제 #5
0
/**
 * 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, timer->expires);

	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);
		timer->expires = ktime_add_ns(timer->expires, incr * orun);
		if (timer->expires.tv64 > now.tv64)
			return orun;
		/*
		 * This (and the ktime_add() below) is the
		 * correction for exact:
		 */
		orun++;
	}
	timer->expires = ktime_add_safe(timer->expires, interval);

	return orun;
}
예제 #6
0
int __hrtimer_start_range_ns(struct hrtimer *timer, ktime_t tim,
		unsigned long delta_ns, const enum hrtimer_mode mode,
		int wakeup)
{
	struct hrtimer_clock_base *base, *new_base;
	unsigned long flags;
	int ret, leftmost;

	base = lock_hrtimer_base(timer, &flags);

	
	ret = remove_hrtimer(timer, base);

	
	new_base = switch_hrtimer_base(timer, base, mode & HRTIMER_MODE_PINNED);

	if (mode & HRTIMER_MODE_REL) {
		tim = ktime_add_safe(tim, new_base->get_time());
#ifdef CONFIG_TIME_LOW_RES
		tim = ktime_add_safe(tim, base->resolution);
#endif
	}

	hrtimer_set_expires_range_ns(timer, tim, delta_ns);

	timer_stats_hrtimer_set_start_info(timer);

	leftmost = enqueue_hrtimer(timer, new_base);

	if (leftmost && new_base->cpu_base == &__get_cpu_var(hrtimer_bases)
		&& hrtimer_enqueue_reprogram(timer, new_base)) {
		if (wakeup) {
			raw_spin_unlock(&new_base->cpu_base->lock);
			raise_softirq_irqoff(HRTIMER_SOFTIRQ);
			local_irq_restore(flags);
			return ret;
		} else {
			__raise_softirq_irqoff(HRTIMER_SOFTIRQ);
		}
	}

	unlock_hrtimer_base(timer, &flags);

	return ret;
}
예제 #7
0
static bool dm_old_request_peeked_before_merge_deadline(struct mapped_device *md)
{
	ktime_t kt_deadline;

	if (!md->seq_rq_merge_deadline_usecs)
		return false;

	kt_deadline = ns_to_ktime((u64)md->seq_rq_merge_deadline_usecs * NSEC_PER_USEC);
	kt_deadline = ktime_add_safe(md->last_rq_start_time, kt_deadline);

	return !ktime_after(ktime_get(), kt_deadline);
}
예제 #8
0
파일: hrtimer.c 프로젝트: AK101111/linux
static inline ktime_t hrtimer_update_lowres(struct hrtimer *timer, ktime_t tim,
					    const enum hrtimer_mode mode)
{
#ifdef CONFIG_TIME_LOW_RES
	/*
	 * CONFIG_TIME_LOW_RES indicates that the system has no way to return
	 * granular time values. For relative timers we add hrtimer_resolution
	 * (i.e. one jiffie) to prevent short timeouts.
	 */
	timer->is_rel = mode & HRTIMER_MODE_REL;
	if (timer->is_rel)
		tim = ktime_add_safe(tim, ktime_set(0, hrtimer_resolution));
#endif
	return tim;
}
예제 #9
0
파일: hrtimer.c 프로젝트: AK101111/linux
/**
 * hrtimer_start_range_ns - (re)start an hrtimer on the current CPU
 * @timer:	the timer to be added
 * @tim:	expiry time
 * @delta_ns:	"slack" range for the timer
 * @mode:	expiry mode: absolute (HRTIMER_MODE_ABS) or
 *		relative (HRTIMER_MODE_REL)
 */
void hrtimer_start_range_ns(struct hrtimer *timer, ktime_t tim,
			    u64 delta_ns, const enum hrtimer_mode mode)
{
	struct hrtimer_clock_base *base, *new_base;
	unsigned long flags;
	int leftmost;

	base = lock_hrtimer_base(timer, &flags);

	/* Remove an active timer from the queue: */
	remove_hrtimer(timer, base, true);

	if (mode & HRTIMER_MODE_REL)
		tim = ktime_add_safe(tim, base->get_time());

	tim = hrtimer_update_lowres(timer, tim, mode);

	hrtimer_set_expires_range_ns(timer, tim, delta_ns);

	/* Switch the timer base, if necessary: */
	new_base = switch_hrtimer_base(timer, base, mode & HRTIMER_MODE_PINNED);

	timer_stats_hrtimer_set_start_info(timer);

	leftmost = enqueue_hrtimer(timer, new_base);
	if (!leftmost)
		goto unlock;

	if (!hrtimer_is_hres_active(timer)) {
		/*
		 * Kick to reschedule the next tick to handle the new timer
		 * on dynticks target.
		 */
		if (new_base->cpu_base->nohz_active)
			wake_up_nohz_cpu(new_base->cpu_base->cpu);
	} else {
		hrtimer_reprogram(timer, new_base);
	}
unlock:
	unlock_hrtimer_base(timer, &flags);
}
int __hrtimer_start_range_ns(struct hrtimer *timer, ktime_t tim,
		unsigned long delta_ns, const enum hrtimer_mode mode,
		int wakeup)
{
	struct hrtimer_clock_base *base, *new_base;
	unsigned long flags;
	int ret, leftmost;
    /*add MTK debug log for ALPS01804694*/
    if(timer->function == NULL) {
		pr_alert("add hrtimer but do nothing");
		dump_stack();
    }
	
	base = lock_hrtimer_base(timer, &flags);

	/* Remove an active timer from the queue: */
	ret = remove_hrtimer(timer, base);

	if (mode & HRTIMER_MODE_REL) {
		tim = ktime_add_safe(tim, 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_range_ns(timer, tim, delta_ns);

	/* Switch the timer base, if necessary: */
	new_base = switch_hrtimer_base(timer, base, mode & HRTIMER_MODE_PINNED);

	timer_stats_hrtimer_set_start_info(timer);

	leftmost = enqueue_hrtimer(timer, new_base);

	/*
	 * Only allow reprogramming if the new base is on this CPU.
	 * (it might still be on another CPU if the timer was pending)
	 *
	 * XXX send_remote_softirq() ?
	 */
	if (leftmost && new_base->cpu_base == &__get_cpu_var(hrtimer_bases)
		&& hrtimer_enqueue_reprogram(timer, new_base)) {
		if (wakeup) {
			/*
			 * We need to drop cpu_base->lock to avoid a
			 * lock ordering issue vs. rq->lock.
			 */
			raw_spin_unlock(&new_base->cpu_base->lock);
			raise_softirq_irqoff(HRTIMER_SOFTIRQ);
			local_irq_restore(flags);
			return ret;
		} else {
			__raise_softirq_irqoff(HRTIMER_SOFTIRQ);
		}
	}

	unlock_hrtimer_base(timer, &flags);

	return ret;
}