posix-timers.c 34.7 KB
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/*
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 * linux/kernel/posix-timers.c
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 *
 *
 * 2002-10-15  Posix Clocks & timers
 *                           by George Anzinger george@mvista.com
 *
 *			     Copyright (C) 2002 2003 by MontaVista Software.
 *
 * 2004-06-01  Fix CLOCK_REALTIME clock/timer TIMER_ABSTIME bug.
 *			     Copyright (C) 2004 Boris Hu
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or (at
 * your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * General Public License for more details.

 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 * MontaVista Software | 1237 East Arques Avenue | Sunnyvale | CA 94085 | USA
 */

/* These are all the functions necessary to implement
 * POSIX clocks & timers
 */
#include <linux/mm.h>
#include <linux/interrupt.h>
#include <linux/slab.h>
#include <linux/time.h>
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#include <linux/mutex.h>
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#include <linux/sched/task.h>
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#include <linux/uaccess.h>
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#include <linux/list.h>
#include <linux/init.h>
#include <linux/compiler.h>
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#include <linux/hash.h>
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#include <linux/posix-clock.h>
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#include <linux/posix-timers.h>
#include <linux/syscalls.h>
#include <linux/wait.h>
#include <linux/workqueue.h>
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#include <linux/export.h>
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#include <linux/hashtable.h>
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#include <linux/compat.h>
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#include "timekeeping.h"
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#include "posix-timers.h"
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/*
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 * Management arrays for POSIX timers. Timers are now kept in static hash table
 * with 512 entries.
 * Timer ids are allocated by local routine, which selects proper hash head by
 * key, constructed from current->signal address and per signal struct counter.
 * This keeps timer ids unique per process, but now they can intersect between
 * processes.
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 */

/*
 * Lets keep our timers in a slab cache :-)
 */
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static struct kmem_cache *posix_timers_cache;
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static DEFINE_HASHTABLE(posix_timers_hashtable, 9);
static DEFINE_SPINLOCK(hash_lock);
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static const struct k_clock * const posix_clocks[];
static const struct k_clock *clockid_to_kclock(const clockid_t id);
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static const struct k_clock clock_realtime, clock_monotonic;
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/*
 * we assume that the new SIGEV_THREAD_ID shares no bits with the other
 * SIGEV values.  Here we put out an error if this assumption fails.
 */
#if SIGEV_THREAD_ID != (SIGEV_THREAD_ID & \
                       ~(SIGEV_SIGNAL | SIGEV_NONE | SIGEV_THREAD))
#error "SIGEV_THREAD_ID must not share bit with other SIGEV values!"
#endif

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/*
 * parisc wants ENOTSUP instead of EOPNOTSUPP
 */
#ifndef ENOTSUP
# define ENANOSLEEP_NOTSUP EOPNOTSUPP
#else
# define ENANOSLEEP_NOTSUP ENOTSUP
#endif
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/*
 * The timer ID is turned into a timer address by idr_find().
 * Verifying a valid ID consists of:
 *
 * a) checking that idr_find() returns other than -1.
 * b) checking that the timer id matches the one in the timer itself.
 * c) that the timer owner is in the callers thread group.
 */

/*
 * CLOCKs: The POSIX standard calls for a couple of clocks and allows us
 *	    to implement others.  This structure defines the various
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 *	    clocks.
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 *
 * RESOLUTION: Clock resolution is used to round up timer and interval
 *	    times, NOT to report clock times, which are reported with as
 *	    much resolution as the system can muster.  In some cases this
 *	    resolution may depend on the underlying clock hardware and
 *	    may not be quantifiable until run time, and only then is the
 *	    necessary code is written.	The standard says we should say
 *	    something about this issue in the documentation...
 *
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 * FUNCTIONS: The CLOCKs structure defines possible functions to
 *	    handle various clock functions.
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 *
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 *	    The standard POSIX timer management code assumes the
 *	    following: 1.) The k_itimer struct (sched.h) is used for
 *	    the timer.  2.) The list, it_lock, it_clock, it_id and
 *	    it_pid fields are not modified by timer code.
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 *
 * Permissions: It is assumed that the clock_settime() function defined
 *	    for each clock will take care of permission checks.	 Some
 *	    clocks may be set able by any user (i.e. local process
 *	    clocks) others not.	 Currently the only set able clock we
 *	    have is CLOCK_REALTIME and its high res counter part, both of
 *	    which we beg off on and pass to do_sys_settimeofday().
 */
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static struct k_itimer *__lock_timer(timer_t timer_id, unsigned long *flags);

#define lock_timer(tid, flags)						   \
({	struct k_itimer *__timr;					   \
	__cond_lock(&__timr->it_lock, __timr = __lock_timer(tid, flags));  \
	__timr;								   \
})
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static int hash(struct signal_struct *sig, unsigned int nr)
{
	return hash_32(hash32_ptr(sig) ^ nr, HASH_BITS(posix_timers_hashtable));
}

static struct k_itimer *__posix_timers_find(struct hlist_head *head,
					    struct signal_struct *sig,
					    timer_t id)
{
	struct k_itimer *timer;

	hlist_for_each_entry_rcu(timer, head, t_hash) {
		if ((timer->it_signal == sig) && (timer->it_id == id))
			return timer;
	}
	return NULL;
}

static struct k_itimer *posix_timer_by_id(timer_t id)
{
	struct signal_struct *sig = current->signal;
	struct hlist_head *head = &posix_timers_hashtable[hash(sig, id)];

	return __posix_timers_find(head, sig, id);
}

static int posix_timer_add(struct k_itimer *timer)
{
	struct signal_struct *sig = current->signal;
	int first_free_id = sig->posix_timer_id;
	struct hlist_head *head;
	int ret = -ENOENT;

	do {
		spin_lock(&hash_lock);
		head = &posix_timers_hashtable[hash(sig, sig->posix_timer_id)];
		if (!__posix_timers_find(head, sig, sig->posix_timer_id)) {
			hlist_add_head_rcu(&timer->t_hash, head);
			ret = sig->posix_timer_id;
		}
		if (++sig->posix_timer_id < 0)
			sig->posix_timer_id = 0;
		if ((sig->posix_timer_id == first_free_id) && (ret == -ENOENT))
			/* Loop over all possible ids completed */
			ret = -EAGAIN;
		spin_unlock(&hash_lock);
	} while (ret == -ENOENT);
	return ret;
}

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static inline void unlock_timer(struct k_itimer *timr, unsigned long flags)
{
	spin_unlock_irqrestore(&timr->it_lock, flags);
}

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/* Get clock_realtime */
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static int posix_clock_realtime_get(clockid_t which_clock, struct timespec64 *tp)
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{
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	ktime_get_real_ts64(tp);
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	return 0;
}

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/* Set clock_realtime */
static int posix_clock_realtime_set(const clockid_t which_clock,
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				    const struct timespec64 *tp)
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{
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	return do_sys_settimeofday64(tp, NULL);
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}

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static int posix_clock_realtime_adj(const clockid_t which_clock,
				    struct timex *t)
{
	return do_adjtimex(t);
}

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/*
 * Get monotonic time for posix timers
 */
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static int posix_ktime_get_ts(clockid_t which_clock, struct timespec64 *tp)
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{
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	ktime_get_ts64(tp);
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	return 0;
}
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/*
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 * Get monotonic-raw time for posix timers
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 */
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static int posix_get_monotonic_raw(clockid_t which_clock, struct timespec64 *tp)
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{
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	getrawmonotonic64(tp);
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	return 0;
}

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static int posix_get_realtime_coarse(clockid_t which_clock, struct timespec64 *tp)
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{
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	*tp = current_kernel_time64();
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	return 0;
}

static int posix_get_monotonic_coarse(clockid_t which_clock,
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						struct timespec64 *tp)
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{
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	*tp = get_monotonic_coarse64();
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	return 0;
}

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static int posix_get_coarse_res(const clockid_t which_clock, struct timespec64 *tp)
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{
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	*tp = ktime_to_timespec64(KTIME_LOW_RES);
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	return 0;
}
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static int posix_get_boottime(const clockid_t which_clock, struct timespec64 *tp)
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{
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	get_monotonic_boottime64(tp);
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	return 0;
}

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static int posix_get_tai(clockid_t which_clock, struct timespec64 *tp)
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{
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	timekeeping_clocktai64(tp);
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	return 0;
}
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static int posix_get_hrtimer_res(clockid_t which_clock, struct timespec64 *tp)
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{
	tp->tv_sec = 0;
	tp->tv_nsec = hrtimer_resolution;
	return 0;
}

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/*
 * Initialize everything, well, just everything in Posix clocks/timers ;)
 */
static __init int init_posix_timers(void)
{
	posix_timers_cache = kmem_cache_create("posix_timers_cache",
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					sizeof (struct k_itimer), 0, SLAB_PANIC,
					NULL);
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	return 0;
}
__initcall(init_posix_timers);

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static void common_hrtimer_rearm(struct k_itimer *timr)
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{
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	struct hrtimer *timer = &timr->it.real.timer;

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	if (!timr->it_interval)
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		return;

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	timr->it_overrun += (unsigned int) hrtimer_forward(timer,
						timer->base->get_time(),
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						timr->it_interval);
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	hrtimer_restart(timer);
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}

/*
 * This function is exported for use by the signal deliver code.  It is
 * called just prior to the info block being released and passes that
 * block to us.  It's function is to update the overrun entry AND to
 * restart the timer.  It should only be called if the timer is to be
 * restarted (i.e. we have flagged this in the sys_private entry of the
 * info block).
 *
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 * To protect against the timer going away while the interrupt is queued,
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 * we require that the it_requeue_pending flag be set.
 */
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void posixtimer_rearm(struct siginfo *info)
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{
	struct k_itimer *timr;
	unsigned long flags;

	timr = lock_timer(info->si_tid, &flags);
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	if (!timr)
		return;
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	if (timr->it_requeue_pending == info->si_sys_private) {
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		timr->kclock->timer_rearm(timr);
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		timr->it_active = 1;
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		timr->it_overrun_last = timr->it_overrun;
		timr->it_overrun = -1;
		++timr->it_requeue_pending;

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		info->si_overrun += timr->it_overrun_last;
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	}

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	unlock_timer(timr, flags);
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}

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int posix_timer_event(struct k_itimer *timr, int si_private)
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{
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	struct task_struct *task;
	int shared, ret = -1;
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	/*
	 * FIXME: if ->sigq is queued we can race with
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	 * dequeue_signal()->posixtimer_rearm().
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	 *
	 * If dequeue_signal() sees the "right" value of
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	 * si_sys_private it calls posixtimer_rearm().
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	 * We re-queue ->sigq and drop ->it_lock().
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	 * posixtimer_rearm() locks the timer
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	 * and re-schedules it while ->sigq is pending.
	 * Not really bad, but not that we want.
	 */
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	timr->sigq->info.si_sys_private = si_private;

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	rcu_read_lock();
	task = pid_task(timr->it_pid, PIDTYPE_PID);
	if (task) {
		shared = !(timr->it_sigev_notify & SIGEV_THREAD_ID);
		ret = send_sigqueue(timr->sigq, task, shared);
	}
	rcu_read_unlock();
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	/* If we failed to send the signal the timer stops. */
	return ret > 0;
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}

/*
 * This function gets called when a POSIX.1b interval timer expires.  It
 * is used as a callback from the kernel internal timer.  The
 * run_timer_list code ALWAYS calls with interrupts on.

 * This code is for CLOCK_REALTIME* and CLOCK_MONOTONIC* timers.
 */
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static enum hrtimer_restart posix_timer_fn(struct hrtimer *timer)
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{
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	struct k_itimer *timr;
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	unsigned long flags;
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	int si_private = 0;
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	enum hrtimer_restart ret = HRTIMER_NORESTART;
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	timr = container_of(timer, struct k_itimer, it.real.timer);
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	spin_lock_irqsave(&timr->it_lock, flags);

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	timr->it_active = 0;
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	if (timr->it_interval != 0)
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		si_private = ++timr->it_requeue_pending;
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	if (posix_timer_event(timr, si_private)) {
		/*
		 * signal was not sent because of sig_ignor
		 * we will not get a call back to restart it AND
		 * it should be restarted.
		 */
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		if (timr->it_interval != 0) {
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			ktime_t now = hrtimer_cb_get_time(timer);

			/*
			 * FIXME: What we really want, is to stop this
			 * timer completely and restart it in case the
			 * SIG_IGN is removed. This is a non trivial
			 * change which involves sighand locking
			 * (sigh !), which we don't want to do late in
			 * the release cycle.
			 *
			 * For now we just let timers with an interval
			 * less than a jiffie expire every jiffie to
			 * avoid softirq starvation in case of SIG_IGN
			 * and a very small interval, which would put
			 * the timer right back on the softirq pending
			 * list. By moving now ahead of time we trick
			 * hrtimer_forward() to expire the timer
			 * later, while we still maintain the overrun
			 * accuracy, but have some inconsistency in
			 * the timer_gettime() case. This is at least
			 * better than a starved softirq. A more
			 * complex fix which solves also another related
			 * inconsistency is already in the pipeline.
			 */
#ifdef CONFIG_HIGH_RES_TIMERS
			{
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				ktime_t kj = NSEC_PER_SEC / HZ;
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				if (timr->it_interval < kj)
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					now = ktime_add(now, kj);
			}
#endif
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			timr->it_overrun += (unsigned int)
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				hrtimer_forward(timer, now,
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						timr->it_interval);
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			ret = HRTIMER_RESTART;
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			++timr->it_requeue_pending;
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			timr->it_active = 1;
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		}
	}

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	unlock_timer(timr, flags);
	return ret;
}
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static struct pid *good_sigevent(sigevent_t * event)
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{
	struct task_struct *rtn = current->group_leader;

	if ((event->sigev_notify & SIGEV_THREAD_ID ) &&
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		(!(rtn = find_task_by_vpid(event->sigev_notify_thread_id)) ||
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		 !same_thread_group(rtn, current) ||
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		 (event->sigev_notify & ~SIGEV_THREAD_ID) != SIGEV_SIGNAL))
		return NULL;

	if (((event->sigev_notify & ~SIGEV_THREAD_ID) != SIGEV_NONE) &&
	    ((event->sigev_signo <= 0) || (event->sigev_signo > SIGRTMAX)))
		return NULL;

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	return task_pid(rtn);
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}

static struct k_itimer * alloc_posix_timer(void)
{
	struct k_itimer *tmr;
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	tmr = kmem_cache_zalloc(posix_timers_cache, GFP_KERNEL);
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	if (!tmr)
		return tmr;
	if (unlikely(!(tmr->sigq = sigqueue_alloc()))) {
		kmem_cache_free(posix_timers_cache, tmr);
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		return NULL;
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	}
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	memset(&tmr->sigq->info, 0, sizeof(siginfo_t));
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	return tmr;
}

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static void k_itimer_rcu_free(struct rcu_head *head)
{
	struct k_itimer *tmr = container_of(head, struct k_itimer, it.rcu);

	kmem_cache_free(posix_timers_cache, tmr);
}

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#define IT_ID_SET	1
#define IT_ID_NOT_SET	0
static void release_posix_timer(struct k_itimer *tmr, int it_id_set)
{
	if (it_id_set) {
		unsigned long flags;
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		spin_lock_irqsave(&hash_lock, flags);
		hlist_del_rcu(&tmr->t_hash);
		spin_unlock_irqrestore(&hash_lock, flags);
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	}
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	put_pid(tmr->it_pid);
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	sigqueue_free(tmr->sigq);
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	call_rcu(&tmr->it.rcu, k_itimer_rcu_free);
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}

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static int common_timer_create(struct k_itimer *new_timer)
{
	hrtimer_init(&new_timer->it.real.timer, new_timer->it_clock, 0);
	return 0;
}

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/* Create a POSIX.1b interval timer. */

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SYSCALL_DEFINE3(timer_create, const clockid_t, which_clock,
		struct sigevent __user *, timer_event_spec,
		timer_t __user *, created_timer_id)
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{
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	const struct k_clock *kc = clockid_to_kclock(which_clock);
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	struct k_itimer *new_timer;
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	int error, new_timer_id;
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	sigevent_t event;
	int it_id_set = IT_ID_NOT_SET;

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	if (!kc)
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		return -EINVAL;
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	if (!kc->timer_create)
		return -EOPNOTSUPP;
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	new_timer = alloc_posix_timer();
	if (unlikely(!new_timer))
		return -EAGAIN;

	spin_lock_init(&new_timer->it_lock);
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	new_timer_id = posix_timer_add(new_timer);
	if (new_timer_id < 0) {
		error = new_timer_id;
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		goto out;
	}

	it_id_set = IT_ID_SET;
	new_timer->it_id = (timer_t) new_timer_id;
	new_timer->it_clock = which_clock;
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	new_timer->kclock = kc;
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	new_timer->it_overrun = -1;

	if (timer_event_spec) {
		if (copy_from_user(&event, timer_event_spec, sizeof (event))) {
			error = -EFAULT;
			goto out;
		}
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		rcu_read_lock();
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		new_timer->it_pid = get_pid(good_sigevent(&event));
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		rcu_read_unlock();
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		if (!new_timer->it_pid) {
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			error = -EINVAL;
			goto out;
		}
	} else {
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		memset(&event.sigev_value, 0, sizeof(event.sigev_value));
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		event.sigev_notify = SIGEV_SIGNAL;
		event.sigev_signo = SIGALRM;
		event.sigev_value.sival_int = new_timer->it_id;
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		new_timer->it_pid = get_pid(task_tgid(current));
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	}

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	new_timer->it_sigev_notify     = event.sigev_notify;
	new_timer->sigq->info.si_signo = event.sigev_signo;
	new_timer->sigq->info.si_value = event.sigev_value;
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	new_timer->sigq->info.si_tid   = new_timer->it_id;
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	new_timer->sigq->info.si_code  = SI_TIMER;
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	if (copy_to_user(created_timer_id,
			 &new_timer_id, sizeof (new_timer_id))) {
		error = -EFAULT;
		goto out;
	}

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	error = kc->timer_create(new_timer);
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	if (error)
		goto out;

562
	spin_lock_irq(&current->sighand->siglock);
563
	new_timer->it_signal = current->signal;
564 565
	list_add(&new_timer->list, &current->signal->posix_timers);
	spin_unlock_irq(&current->sighand->siglock);
566 567

	return 0;
568
	/*
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	 * In the case of the timer belonging to another task, after
	 * the task is unlocked, the timer is owned by the other task
	 * and may cease to exist at any time.  Don't use or modify
	 * new_timer after the unlock call.
	 */
out:
575
	release_posix_timer(new_timer, it_id_set);
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	return error;
}

/*
 * Locking issues: We need to protect the result of the id look up until
 * we get the timer locked down so it is not deleted under us.  The
 * removal is done under the idr spinlock so we use that here to bridge
 * the find to the timer lock.  To avoid a dead lock, the timer id MUST
 * be release with out holding the timer lock.
 */
N
Namhyung Kim 已提交
586
static struct k_itimer *__lock_timer(timer_t timer_id, unsigned long *flags)
L
Linus Torvalds 已提交
587 588
{
	struct k_itimer *timr;
E
Eric Dumazet 已提交
589

590 591 592 593 594 595 596
	/*
	 * timer_t could be any type >= int and we want to make sure any
	 * @timer_id outside positive int range fails lookup.
	 */
	if ((unsigned long long)timer_id > INT_MAX)
		return NULL;

E
Eric Dumazet 已提交
597
	rcu_read_lock();
598
	timr = posix_timer_by_id(timer_id);
L
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599
	if (timr) {
E
Eric Dumazet 已提交
600
		spin_lock_irqsave(&timr->it_lock, *flags);
601
		if (timr->it_signal == current->signal) {
E
Eric Dumazet 已提交
602
			rcu_read_unlock();
603 604
			return timr;
		}
E
Eric Dumazet 已提交
605
		spin_unlock_irqrestore(&timr->it_lock, *flags);
606
	}
E
Eric Dumazet 已提交
607
	rcu_read_unlock();
L
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609
	return NULL;
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}

612 613 614 615 616 617 618 619 620 621 622 623 624 625
static ktime_t common_hrtimer_remaining(struct k_itimer *timr, ktime_t now)
{
	struct hrtimer *timer = &timr->it.real.timer;

	return __hrtimer_expires_remaining_adjusted(timer, now);
}

static int common_hrtimer_forward(struct k_itimer *timr, ktime_t now)
{
	struct hrtimer *timer = &timr->it.real.timer;

	return (int)hrtimer_forward(timer, now, timr->it_interval);
}

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/*
 * Get the time remaining on a POSIX.1b interval timer.  This function
 * is ALWAYS called with spin_lock_irq on the timer, thus it must not
 * mess with irq.
 *
 * We have a couple of messes to clean up here.  First there is the case
 * of a timer that has a requeue pending.  These timers should appear to
 * be in the timer list with an expiry as if we were to requeue them
 * now.
 *
 * The second issue is the SIGEV_NONE timer which may be active but is
 * not really ever put in the timer list (to save system resources).
 * This timer may be expired, and if so, we will do it here.  Otherwise
 * it is the same as a requeue pending timer WRT to what we should
 * report.
 */
642
void common_timer_get(struct k_itimer *timr, struct itimerspec64 *cur_setting)
L
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643
{
644
	const struct k_clock *kc = timr->kclock;
645
	ktime_t now, remaining, iv;
646 647
	struct timespec64 ts64;
	bool sig_none;
L
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649
	sig_none = (timr->it_sigev_notify & ~SIGEV_THREAD_ID) == SIGEV_NONE;
650
	iv = timr->it_interval;
651

652
	/* interval timer ? */
653
	if (iv) {
654
		cur_setting->it_interval = ktime_to_timespec64(iv);
655 656 657 658 659 660 661 662
	} else if (!timr->it_active) {
		/*
		 * SIGEV_NONE oneshot timers are never queued. Check them
		 * below.
		 */
		if (!sig_none)
			return;
	}
663

664 665 666 667 668 669
	/*
	 * The timespec64 based conversion is suboptimal, but it's not
	 * worth to implement yet another callback.
	 */
	kc->clock_get(timr->it_clock, &ts64);
	now = timespec64_to_ktime(ts64);
670

671
	/*
672 673
	 * When a requeue is pending or this is a SIGEV_NONE timer move the
	 * expiry time forward by intervals, so expiry is > now.
674
	 */
675 676
	if (iv && (timr->it_requeue_pending & REQUEUE_PENDING || sig_none))
		timr->it_overrun += kc->timer_forward(timr, now);
677

678
	remaining = kc->timer_remaining(timr, now);
679
	/* Return 0 only, when the timer is expired and not pending */
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Thomas Gleixner 已提交
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	if (remaining <= 0) {
681 682 683 684
		/*
		 * A single shot SIGEV_NONE timer must return 0, when
		 * it is expired !
		 */
685
		if (!sig_none)
686
			cur_setting->it_value.tv_nsec = 1;
687
	} else {
688
		cur_setting->it_value = ktime_to_timespec64(remaining);
689
	}
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}

/* Get the time remaining on a POSIX.1b interval timer. */
693
static int do_timer_gettime(timer_t timer_id,  struct itimerspec64 *setting)
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{
695
	struct k_itimer *timr;
696
	const struct k_clock *kc;
L
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697
	unsigned long flags;
698
	int ret = 0;
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	timr = lock_timer(timer_id, &flags);
	if (!timr)
		return -EINVAL;

704
	memset(setting, 0, sizeof(*setting));
705
	kc = timr->kclock;
706 707 708
	if (WARN_ON_ONCE(!kc || !kc->timer_get))
		ret = -EINVAL;
	else
709
		kc->timer_get(timr, setting);
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	unlock_timer(timr, flags);
712 713
	return ret;
}
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715 716 717 718 719
/* Get the time remaining on a POSIX.1b interval timer. */
SYSCALL_DEFINE2(timer_gettime, timer_t, timer_id,
		struct itimerspec __user *, setting)
{
	struct itimerspec64 cur_setting64;
L
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721 722 723 724 725 726 727
	int ret = do_timer_gettime(timer_id, &cur_setting64);
	if (!ret) {
		struct itimerspec cur_setting;
		cur_setting = itimerspec64_to_itimerspec(&cur_setting64);
		if (copy_to_user(setting, &cur_setting, sizeof (cur_setting)))
			ret = -EFAULT;
	}
728
	return ret;
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}
730

731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747
#ifdef CONFIG_COMPAT
COMPAT_SYSCALL_DEFINE2(timer_gettime, timer_t, timer_id,
		       struct compat_itimerspec __user *, setting)
{
	struct itimerspec64 cur_setting64;

	int ret = do_timer_gettime(timer_id, &cur_setting64);
	if (!ret) {
		struct itimerspec cur_setting;
		cur_setting = itimerspec64_to_itimerspec(&cur_setting64);
		if (put_compat_itimerspec(setting, &cur_setting))
			ret = -EFAULT;
	}
	return ret;
}
#endif

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/*
 * Get the number of overruns of a POSIX.1b interval timer.  This is to
 * be the overrun of the timer last delivered.  At the same time we are
 * accumulating overruns on the next timer.  The overrun is frozen when
 * the signal is delivered, either at the notify time (if the info block
 * is not queued) or at the actual delivery time (as we are informed by
754
 * the call back to posixtimer_rearm().  So all we need to do is
L
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 * to pick up the frozen overrun.
 */
757
SYSCALL_DEFINE1(timer_getoverrun, timer_t, timer_id)
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758 759 760
{
	struct k_itimer *timr;
	int overrun;
761
	unsigned long flags;
L
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	timr = lock_timer(timer_id, &flags);
	if (!timr)
		return -EINVAL;

	overrun = timr->it_overrun_last;
	unlock_timer(timr, flags);

	return overrun;
}

773 774 775 776 777 778 779
static void common_hrtimer_arm(struct k_itimer *timr, ktime_t expires,
			       bool absolute, bool sigev_none)
{
	struct hrtimer *timer = &timr->it.real.timer;
	enum hrtimer_mode mode;

	mode = absolute ? HRTIMER_MODE_ABS : HRTIMER_MODE_REL;
780 781 782 783 784 785 786 787 788 789 790 791
	/*
	 * Posix magic: Relative CLOCK_REALTIME timers are not affected by
	 * clock modifications, so they become CLOCK_MONOTONIC based under the
	 * hood. See hrtimer_init(). Update timr->kclock, so the generic
	 * functions which use timr->kclock->clock_get() work.
	 *
	 * Note: it_clock stays unmodified, because the next timer_set() might
	 * use ABSTIME, so it needs to switch back.
	 */
	if (timr->it_clock == CLOCK_REALTIME)
		timr->kclock = absolute ? &clock_realtime : &clock_monotonic;

792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807
	hrtimer_init(&timr->it.real.timer, timr->it_clock, mode);
	timr->it.real.timer.function = posix_timer_fn;

	if (!absolute)
		expires = ktime_add_safe(expires, timer->base->get_time());
	hrtimer_set_expires(timer, expires);

	if (!sigev_none)
		hrtimer_start_expires(timer, HRTIMER_MODE_ABS);
}

static int common_hrtimer_try_to_cancel(struct k_itimer *timr)
{
	return hrtimer_try_to_cancel(&timr->it.real.timer);
}

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/* Set a POSIX.1b interval timer. */
809 810 811
int common_timer_set(struct k_itimer *timr, int flags,
		     struct itimerspec64 *new_setting,
		     struct itimerspec64 *old_setting)
L
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812
{
813 814 815
	const struct k_clock *kc = timr->kclock;
	bool sigev_none;
	ktime_t expires;
L
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816 817 818 819

	if (old_setting)
		common_timer_get(timr, old_setting);

820
	/* Prevent rearming by clearing the interval */
821
	timr->it_interval = 0;
L
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822
	/*
823 824
	 * Careful here. On SMP systems the timer expiry function could be
	 * active and spinning on timr->it_lock.
L
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825
	 */
826
	if (kc->timer_try_to_cancel(timr) < 0)
L
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827 828
		return TIMER_RETRY;

829 830
	timr->it_active = 0;
	timr->it_requeue_pending = (timr->it_requeue_pending + 2) &
L
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831 832 833
		~REQUEUE_PENDING;
	timr->it_overrun_last = 0;

834
	/* Switch off the timer when it_value is zero */
835 836
	if (!new_setting->it_value.tv_sec && !new_setting->it_value.tv_nsec)
		return 0;
L
Linus Torvalds 已提交
837

838
	timr->it_interval = timespec64_to_ktime(new_setting->it_interval);
839 840
	expires = timespec64_to_ktime(new_setting->it_value);
	sigev_none = (timr->it_sigev_notify & ~SIGEV_THREAD_ID) == SIGEV_NONE;
841

842 843
	kc->timer_arm(timr, expires, flags & TIMER_ABSTIME, sigev_none);
	timr->it_active = !sigev_none;
L
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844 845 846
	return 0;
}

847 848 849
static int do_timer_settime(timer_t timer_id, int flags,
			    struct itimerspec64 *new_spec64,
			    struct itimerspec64 *old_spec64)
L
Linus Torvalds 已提交
850
{
851
	const struct k_clock *kc;
852
	struct k_itimer *timr;
853
	unsigned long flag;
854
	int error = 0;
L
Linus Torvalds 已提交
855

856 857
	if (!timespec64_valid(&new_spec64->it_interval) ||
	    !timespec64_valid(&new_spec64->it_value))
L
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858 859
		return -EINVAL;

860 861
	if (old_spec64)
		memset(old_spec64, 0, sizeof(*old_spec64));
L
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862 863 864 865 866
retry:
	timr = lock_timer(timer_id, &flag);
	if (!timr)
		return -EINVAL;

867
	kc = timr->kclock;
868 869 870
	if (WARN_ON_ONCE(!kc || !kc->timer_set))
		error = -EINVAL;
	else
871
		error = kc->timer_set(timr, flags, new_spec64, old_spec64);
L
Linus Torvalds 已提交
872 873 874

	unlock_timer(timr, flag);
	if (error == TIMER_RETRY) {
875
		old_spec64 = NULL;	// We already got the old time...
L
Linus Torvalds 已提交
876 877 878
		goto retry;
	}

879 880
	return error;
}
L
Linus Torvalds 已提交
881

882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931
/* Set a POSIX.1b interval timer */
SYSCALL_DEFINE4(timer_settime, timer_t, timer_id, int, flags,
		const struct itimerspec __user *, new_setting,
		struct itimerspec __user *, old_setting)
{
	struct itimerspec64 new_spec64, old_spec64;
	struct itimerspec64 *rtn = old_setting ? &old_spec64 : NULL;
	struct itimerspec new_spec;
	int error = 0;

	if (!new_setting)
		return -EINVAL;

	if (copy_from_user(&new_spec, new_setting, sizeof (new_spec)))
		return -EFAULT;
	new_spec64 = itimerspec_to_itimerspec64(&new_spec);

	error = do_timer_settime(timer_id, flags, &new_spec64, rtn);
	if (!error && old_setting) {
		struct itimerspec old_spec;
		old_spec = itimerspec64_to_itimerspec(&old_spec64);
		if (copy_to_user(old_setting, &old_spec, sizeof (old_spec)))
			error = -EFAULT;
	}
	return error;
}

#ifdef CONFIG_COMPAT
COMPAT_SYSCALL_DEFINE4(timer_settime, timer_t, timer_id, int, flags,
		       struct compat_itimerspec __user *, new,
		       struct compat_itimerspec __user *, old)
{
	struct itimerspec64 new_spec64, old_spec64;
	struct itimerspec64 *rtn = old ? &old_spec64 : NULL;
	struct itimerspec new_spec;
	int error = 0;

	if (!new)
		return -EINVAL;
	if (get_compat_itimerspec(&new_spec, new))
		return -EFAULT;

	new_spec64 = itimerspec_to_itimerspec64(&new_spec);
	error = do_timer_settime(timer_id, flags, &new_spec64, rtn);
	if (!error && old) {
		struct itimerspec old_spec;
		old_spec = itimerspec64_to_itimerspec(&old_spec64);
		if (put_compat_itimerspec(old, &old_spec))
			error = -EFAULT;
	}
L
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932 933
	return error;
}
934
#endif
L
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935

936
int common_timer_del(struct k_itimer *timer)
L
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937
{
938
	const struct k_clock *kc = timer->kclock;
939

940 941
	timer->it_interval = 0;
	if (kc->timer_try_to_cancel(timer) < 0)
L
Linus Torvalds 已提交
942
		return TIMER_RETRY;
943
	timer->it_active = 0;
L
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944 945 946 947 948
	return 0;
}

static inline int timer_delete_hook(struct k_itimer *timer)
{
949
	const struct k_clock *kc = timer->kclock;
950 951 952 953

	if (WARN_ON_ONCE(!kc || !kc->timer_del))
		return -EINVAL;
	return kc->timer_del(timer);
L
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954 955 956
}

/* Delete a POSIX.1b interval timer. */
957
SYSCALL_DEFINE1(timer_delete, timer_t, timer_id)
L
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958 959
{
	struct k_itimer *timer;
960
	unsigned long flags;
L
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961 962 963 964 965 966

retry_delete:
	timer = lock_timer(timer_id, &flags);
	if (!timer)
		return -EINVAL;

967
	if (timer_delete_hook(timer) == TIMER_RETRY) {
L
Linus Torvalds 已提交
968 969 970
		unlock_timer(timer, flags);
		goto retry_delete;
	}
971

L
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972 973 974 975 976 977 978
	spin_lock(&current->sighand->siglock);
	list_del(&timer->list);
	spin_unlock(&current->sighand->siglock);
	/*
	 * This keeps any tasks waiting on the spin lock from thinking
	 * they got something (see the lock code above).
	 */
979
	timer->it_signal = NULL;
980

L
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981 982 983 984
	unlock_timer(timer, flags);
	release_posix_timer(timer, IT_ID_SET);
	return 0;
}
985

L
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986 987 988
/*
 * return timer owned by the process, used by exit_itimers
 */
989
static void itimer_delete(struct k_itimer *timer)
L
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990 991 992 993 994 995
{
	unsigned long flags;

retry_delete:
	spin_lock_irqsave(&timer->it_lock, flags);

996
	if (timer_delete_hook(timer) == TIMER_RETRY) {
L
Linus Torvalds 已提交
997 998 999 1000 1001 1002 1003 1004
		unlock_timer(timer, flags);
		goto retry_delete;
	}
	list_del(&timer->list);
	/*
	 * This keeps any tasks waiting on the spin lock from thinking
	 * they got something (see the lock code above).
	 */
1005
	timer->it_signal = NULL;
1006

L
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1007 1008 1009 1010 1011
	unlock_timer(timer, flags);
	release_posix_timer(timer, IT_ID_SET);
}

/*
1012
 * This is called by do_exit or de_thread, only when there are no more
L
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1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024
 * references to the shared signal_struct.
 */
void exit_itimers(struct signal_struct *sig)
{
	struct k_itimer *tmr;

	while (!list_empty(&sig->posix_timers)) {
		tmr = list_entry(sig->posix_timers.next, struct k_itimer, list);
		itimer_delete(tmr);
	}
}

1025 1026
SYSCALL_DEFINE2(clock_settime, const clockid_t, which_clock,
		const struct timespec __user *, tp)
L
Linus Torvalds 已提交
1027
{
1028
	const struct k_clock *kc = clockid_to_kclock(which_clock);
1029
	struct timespec64 new_tp64;
L
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1030 1031
	struct timespec new_tp;

1032
	if (!kc || !kc->clock_set)
L
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1033
		return -EINVAL;
1034

L
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1035 1036
	if (copy_from_user(&new_tp, tp, sizeof (*tp)))
		return -EFAULT;
1037
	new_tp64 = timespec_to_timespec64(new_tp);
L
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1038

1039
	return kc->clock_set(which_clock, &new_tp64);
L
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1040 1041
}

1042 1043
SYSCALL_DEFINE2(clock_gettime, const clockid_t, which_clock,
		struct timespec __user *,tp)
L
Linus Torvalds 已提交
1044
{
1045
	const struct k_clock *kc = clockid_to_kclock(which_clock);
1046
	struct timespec64 kernel_tp64;
L
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1047 1048 1049
	struct timespec kernel_tp;
	int error;

1050
	if (!kc)
L
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1051
		return -EINVAL;
1052

1053 1054
	error = kc->clock_get(which_clock, &kernel_tp64);
	kernel_tp = timespec64_to_timespec(kernel_tp64);
1055

L
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1056 1057 1058 1059 1060 1061
	if (!error && copy_to_user(tp, &kernel_tp, sizeof (kernel_tp)))
		error = -EFAULT;

	return error;
}

1062 1063 1064
SYSCALL_DEFINE2(clock_adjtime, const clockid_t, which_clock,
		struct timex __user *, utx)
{
1065
	const struct k_clock *kc = clockid_to_kclock(which_clock);
1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078
	struct timex ktx;
	int err;

	if (!kc)
		return -EINVAL;
	if (!kc->clock_adj)
		return -EOPNOTSUPP;

	if (copy_from_user(&ktx, utx, sizeof(ktx)))
		return -EFAULT;

	err = kc->clock_adj(which_clock, &ktx);

1079
	if (err >= 0 && copy_to_user(utx, &ktx, sizeof(ktx)))
1080 1081 1082 1083 1084
		return -EFAULT;

	return err;
}

1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111
#ifdef CONFIG_COMPAT

COMPAT_SYSCALL_DEFINE2(clock_adjtime, clockid_t, which_clock,
		       struct compat_timex __user *, utp)
{
	const struct k_clock *kc = clockid_to_kclock(which_clock);
	struct timex ktx;
	int err;

	if (!kc)
		return -EINVAL;
	if (!kc->clock_adj)
		return -EOPNOTSUPP;

	err = compat_get_timex(&ktx, utp);
	if (err)
		return err;

	err = kc->clock_adj(which_clock, &ktx);

	if (err >= 0)
		err = compat_put_timex(utp, &ktx);

	return err;
}
#endif

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SYSCALL_DEFINE2(clock_getres, const clockid_t, which_clock,
		struct timespec __user *, tp)
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{
1115
	const struct k_clock *kc = clockid_to_kclock(which_clock);
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	struct timespec64 rtn_tp64;
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	struct timespec rtn_tp;
	int error;

1120
	if (!kc)
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		return -EINVAL;

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	error = kc->clock_getres(which_clock, &rtn_tp64);
	rtn_tp = timespec64_to_timespec(rtn_tp64);
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1126
	if (!error && tp && copy_to_user(tp, &rtn_tp, sizeof (rtn_tp)))
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		error = -EFAULT;

	return error;
}

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/*
 * nanosleep for monotonic and realtime clocks
 */
static int common_nsleep(const clockid_t which_clock, int flags,
1136
			 struct timespec64 *tsave)
1137
{
1138
	return hrtimer_nanosleep(tsave, flags & TIMER_ABSTIME ?
1139 1140
				 HRTIMER_MODE_ABS : HRTIMER_MODE_REL,
				 which_clock);
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}
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SYSCALL_DEFINE4(clock_nanosleep, const clockid_t, which_clock, int, flags,
		const struct timespec __user *, rqtp,
		struct timespec __user *, rmtp)
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{
1147
	const struct k_clock *kc = clockid_to_kclock(which_clock);
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	struct timespec64 t64;
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	struct timespec t;

1151
	if (!kc)
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		return -EINVAL;
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	if (!kc->nsleep)
		return -ENANOSLEEP_NOTSUP;
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	if (copy_from_user(&t, rqtp, sizeof (struct timespec)))
		return -EFAULT;

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	t64 = timespec_to_timespec64(t);
	if (!timespec64_valid(&t64))
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		return -EINVAL;
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	if (flags & TIMER_ABSTIME)
		rmtp = NULL;
1164
	current->restart_block.nanosleep.type = rmtp ? TT_NATIVE : TT_NONE;
1165
	current->restart_block.nanosleep.rmtp = rmtp;
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	return kc->nsleep(which_clock, flags, &t64);
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}
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#ifdef CONFIG_COMPAT
COMPAT_SYSCALL_DEFINE4(clock_nanosleep, clockid_t, which_clock, int, flags,
		       struct compat_timespec __user *, rqtp,
		       struct compat_timespec __user *, rmtp)
1174
{
1175
	const struct k_clock *kc = clockid_to_kclock(which_clock);
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	struct timespec64 t64;
	struct timespec t;
1178

1179
	if (!kc)
1180
		return -EINVAL;
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	if (!kc->nsleep)
		return -ENANOSLEEP_NOTSUP;

	if (compat_get_timespec(&t, rqtp))
		return -EFAULT;
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	t64 = timespec_to_timespec64(t);
	if (!timespec64_valid(&t64))
		return -EINVAL;
	if (flags & TIMER_ABSTIME)
		rmtp = NULL;
	current->restart_block.nanosleep.type = rmtp ? TT_COMPAT : TT_NONE;
	current->restart_block.nanosleep.compat_rmtp = rmtp;

	return kc->nsleep(which_clock, flags, &t64);
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}
1197
#endif
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static const struct k_clock clock_realtime = {
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	.clock_getres		= posix_get_hrtimer_res,
	.clock_get		= posix_clock_realtime_get,
	.clock_set		= posix_clock_realtime_set,
	.clock_adj		= posix_clock_realtime_adj,
	.nsleep			= common_nsleep,
	.timer_create		= common_timer_create,
	.timer_set		= common_timer_set,
	.timer_get		= common_timer_get,
	.timer_del		= common_timer_del,
	.timer_rearm		= common_hrtimer_rearm,
	.timer_forward		= common_hrtimer_forward,
	.timer_remaining	= common_hrtimer_remaining,
	.timer_try_to_cancel	= common_hrtimer_try_to_cancel,
	.timer_arm		= common_hrtimer_arm,
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};

static const struct k_clock clock_monotonic = {
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	.clock_getres		= posix_get_hrtimer_res,
	.clock_get		= posix_ktime_get_ts,
	.nsleep			= common_nsleep,
	.timer_create		= common_timer_create,
	.timer_set		= common_timer_set,
	.timer_get		= common_timer_get,
	.timer_del		= common_timer_del,
	.timer_rearm		= common_hrtimer_rearm,
	.timer_forward		= common_hrtimer_forward,
	.timer_remaining	= common_hrtimer_remaining,
	.timer_try_to_cancel	= common_hrtimer_try_to_cancel,
	.timer_arm		= common_hrtimer_arm,
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};

static const struct k_clock clock_monotonic_raw = {
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	.clock_getres		= posix_get_hrtimer_res,
	.clock_get		= posix_get_monotonic_raw,
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};

static const struct k_clock clock_realtime_coarse = {
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	.clock_getres		= posix_get_coarse_res,
	.clock_get		= posix_get_realtime_coarse,
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};

static const struct k_clock clock_monotonic_coarse = {
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	.clock_getres		= posix_get_coarse_res,
	.clock_get		= posix_get_monotonic_coarse,
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};

static const struct k_clock clock_tai = {
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	.clock_getres		= posix_get_hrtimer_res,
	.clock_get		= posix_get_tai,
	.nsleep			= common_nsleep,
	.timer_create		= common_timer_create,
	.timer_set		= common_timer_set,
	.timer_get		= common_timer_get,
	.timer_del		= common_timer_del,
	.timer_rearm		= common_hrtimer_rearm,
	.timer_forward		= common_hrtimer_forward,
	.timer_remaining	= common_hrtimer_remaining,
	.timer_try_to_cancel	= common_hrtimer_try_to_cancel,
	.timer_arm		= common_hrtimer_arm,
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};

static const struct k_clock clock_boottime = {
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	.clock_getres		= posix_get_hrtimer_res,
	.clock_get		= posix_get_boottime,
	.nsleep			= common_nsleep,
	.timer_create		= common_timer_create,
	.timer_set		= common_timer_set,
	.timer_get		= common_timer_get,
	.timer_del		= common_timer_del,
	.timer_rearm		= common_hrtimer_rearm,
	.timer_forward		= common_hrtimer_forward,
	.timer_remaining	= common_hrtimer_remaining,
	.timer_try_to_cancel	= common_hrtimer_try_to_cancel,
	.timer_arm		= common_hrtimer_arm,
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};

static const struct k_clock * const posix_clocks[] = {
	[CLOCK_REALTIME]		= &clock_realtime,
	[CLOCK_MONOTONIC]		= &clock_monotonic,
	[CLOCK_PROCESS_CPUTIME_ID]	= &clock_process,
	[CLOCK_THREAD_CPUTIME_ID]	= &clock_thread,
	[CLOCK_MONOTONIC_RAW]		= &clock_monotonic_raw,
	[CLOCK_REALTIME_COARSE]		= &clock_realtime_coarse,
	[CLOCK_MONOTONIC_COARSE]	= &clock_monotonic_coarse,
	[CLOCK_BOOTTIME]		= &clock_boottime,
	[CLOCK_REALTIME_ALARM]		= &alarm_clock,
	[CLOCK_BOOTTIME_ALARM]		= &alarm_clock,
	[CLOCK_TAI]			= &clock_tai,
};

static const struct k_clock *clockid_to_kclock(const clockid_t id)
{
	if (id < 0)
		return (id & CLOCKFD_MASK) == CLOCKFD ?
			&clock_posix_dynamic : &clock_posix_cpu;

	if (id >= ARRAY_SIZE(posix_clocks) || !posix_clocks[id])
		return NULL;
	return posix_clocks[id];
}