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- // SPDX-License-Identifier: GPL-2.0+
- /*
- * 2002-10-15 Posix Clocks & timers
- * by George Anzinger [email protected]
- * Copyright (C) 2002 2003 by MontaVista Software.
- *
- * 2004-06-01 Fix CLOCK_REALTIME clock/timer TIMER_ABSTIME bug.
- * Copyright (C) 2004 Boris Hu
- *
- * 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>
- #include <linux/mutex.h>
- #include <linux/sched/task.h>
- #include <linux/uaccess.h>
- #include <linux/list.h>
- #include <linux/init.h>
- #include <linux/compiler.h>
- #include <linux/hash.h>
- #include <linux/posix-clock.h>
- #include <linux/posix-timers.h>
- #include <linux/syscalls.h>
- #include <linux/wait.h>
- #include <linux/workqueue.h>
- #include <linux/export.h>
- #include <linux/hashtable.h>
- #include <linux/compat.h>
- #include <linux/nospec.h>
- #include <linux/time_namespace.h>
- #include "timekeeping.h"
- #include "posix-timers.h"
- /*
- * 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.
- */
- /*
- * Lets keep our timers in a slab cache :-)
- */
- static struct kmem_cache *posix_timers_cache;
- static DEFINE_HASHTABLE(posix_timers_hashtable, 9);
- static DEFINE_SPINLOCK(hash_lock);
- static const struct k_clock * const posix_clocks[];
- static const struct k_clock *clockid_to_kclock(const clockid_t id);
- static const struct k_clock clock_realtime, clock_monotonic;
- /*
- * 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
- /*
- * 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
- * clocks.
- *
- * 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...
- *
- * FUNCTIONS: The CLOCKs structure defines possible functions to
- * handle various clock functions.
- *
- * 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.
- *
- * 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().
- */
- 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; \
- })
- 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,
- lockdep_is_held(&hash_lock)) {
- 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;
- }
- static inline void unlock_timer(struct k_itimer *timr, unsigned long flags)
- {
- spin_unlock_irqrestore(&timr->it_lock, flags);
- }
- /* Get clock_realtime */
- static int posix_get_realtime_timespec(clockid_t which_clock, struct timespec64 *tp)
- {
- ktime_get_real_ts64(tp);
- return 0;
- }
- static ktime_t posix_get_realtime_ktime(clockid_t which_clock)
- {
- return ktime_get_real();
- }
- /* Set clock_realtime */
- static int posix_clock_realtime_set(const clockid_t which_clock,
- const struct timespec64 *tp)
- {
- return do_sys_settimeofday64(tp, NULL);
- }
- static int posix_clock_realtime_adj(const clockid_t which_clock,
- struct __kernel_timex *t)
- {
- return do_adjtimex(t);
- }
- /*
- * Get monotonic time for posix timers
- */
- static int posix_get_monotonic_timespec(clockid_t which_clock, struct timespec64 *tp)
- {
- ktime_get_ts64(tp);
- timens_add_monotonic(tp);
- return 0;
- }
- static ktime_t posix_get_monotonic_ktime(clockid_t which_clock)
- {
- return ktime_get();
- }
- /*
- * Get monotonic-raw time for posix timers
- */
- static int posix_get_monotonic_raw(clockid_t which_clock, struct timespec64 *tp)
- {
- ktime_get_raw_ts64(tp);
- timens_add_monotonic(tp);
- return 0;
- }
- static int posix_get_realtime_coarse(clockid_t which_clock, struct timespec64 *tp)
- {
- ktime_get_coarse_real_ts64(tp);
- return 0;
- }
- static int posix_get_monotonic_coarse(clockid_t which_clock,
- struct timespec64 *tp)
- {
- ktime_get_coarse_ts64(tp);
- timens_add_monotonic(tp);
- return 0;
- }
- static int posix_get_coarse_res(const clockid_t which_clock, struct timespec64 *tp)
- {
- *tp = ktime_to_timespec64(KTIME_LOW_RES);
- return 0;
- }
- static int posix_get_boottime_timespec(const clockid_t which_clock, struct timespec64 *tp)
- {
- ktime_get_boottime_ts64(tp);
- timens_add_boottime(tp);
- return 0;
- }
- static ktime_t posix_get_boottime_ktime(const clockid_t which_clock)
- {
- return ktime_get_boottime();
- }
- static int posix_get_tai_timespec(clockid_t which_clock, struct timespec64 *tp)
- {
- ktime_get_clocktai_ts64(tp);
- return 0;
- }
- static ktime_t posix_get_tai_ktime(clockid_t which_clock)
- {
- return ktime_get_clocktai();
- }
- static int posix_get_hrtimer_res(clockid_t which_clock, struct timespec64 *tp)
- {
- tp->tv_sec = 0;
- tp->tv_nsec = hrtimer_resolution;
- return 0;
- }
- /*
- * 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",
- sizeof(struct k_itimer), 0,
- SLAB_PANIC | SLAB_ACCOUNT, NULL);
- return 0;
- }
- __initcall(init_posix_timers);
- /*
- * The siginfo si_overrun field and the return value of timer_getoverrun(2)
- * are of type int. Clamp the overrun value to INT_MAX
- */
- static inline int timer_overrun_to_int(struct k_itimer *timr, int baseval)
- {
- s64 sum = timr->it_overrun_last + (s64)baseval;
- return sum > (s64)INT_MAX ? INT_MAX : (int)sum;
- }
- static void common_hrtimer_rearm(struct k_itimer *timr)
- {
- struct hrtimer *timer = &timr->it.real.timer;
- timr->it_overrun += hrtimer_forward(timer, timer->base->get_time(),
- timr->it_interval);
- hrtimer_restart(timer);
- }
- /*
- * 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).
- *
- * To protect against the timer going away while the interrupt is queued,
- * we require that the it_requeue_pending flag be set.
- */
- void posixtimer_rearm(struct kernel_siginfo *info)
- {
- struct k_itimer *timr;
- unsigned long flags;
- timr = lock_timer(info->si_tid, &flags);
- if (!timr)
- return;
- if (timr->it_interval && timr->it_requeue_pending == info->si_sys_private) {
- timr->kclock->timer_rearm(timr);
- timr->it_active = 1;
- timr->it_overrun_last = timr->it_overrun;
- timr->it_overrun = -1LL;
- ++timr->it_requeue_pending;
- info->si_overrun = timer_overrun_to_int(timr, info->si_overrun);
- }
- unlock_timer(timr, flags);
- }
- int posix_timer_event(struct k_itimer *timr, int si_private)
- {
- enum pid_type type;
- int ret;
- /*
- * FIXME: if ->sigq is queued we can race with
- * dequeue_signal()->posixtimer_rearm().
- *
- * If dequeue_signal() sees the "right" value of
- * si_sys_private it calls posixtimer_rearm().
- * We re-queue ->sigq and drop ->it_lock().
- * posixtimer_rearm() locks the timer
- * and re-schedules it while ->sigq is pending.
- * Not really bad, but not that we want.
- */
- timr->sigq->info.si_sys_private = si_private;
- type = !(timr->it_sigev_notify & SIGEV_THREAD_ID) ? PIDTYPE_TGID : PIDTYPE_PID;
- ret = send_sigqueue(timr->sigq, timr->it_pid, type);
- /* If we failed to send the signal the timer stops. */
- return ret > 0;
- }
- /*
- * 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.
- */
- static enum hrtimer_restart posix_timer_fn(struct hrtimer *timer)
- {
- struct k_itimer *timr;
- unsigned long flags;
- int si_private = 0;
- enum hrtimer_restart ret = HRTIMER_NORESTART;
- timr = container_of(timer, struct k_itimer, it.real.timer);
- spin_lock_irqsave(&timr->it_lock, flags);
- timr->it_active = 0;
- if (timr->it_interval != 0)
- si_private = ++timr->it_requeue_pending;
- 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.
- */
- if (timr->it_interval != 0) {
- 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
- {
- ktime_t kj = NSEC_PER_SEC / HZ;
- if (timr->it_interval < kj)
- now = ktime_add(now, kj);
- }
- #endif
- timr->it_overrun += hrtimer_forward(timer, now,
- timr->it_interval);
- ret = HRTIMER_RESTART;
- ++timr->it_requeue_pending;
- timr->it_active = 1;
- }
- }
- unlock_timer(timr, flags);
- return ret;
- }
- static struct pid *good_sigevent(sigevent_t * event)
- {
- struct pid *pid = task_tgid(current);
- struct task_struct *rtn;
- switch (event->sigev_notify) {
- case SIGEV_SIGNAL | SIGEV_THREAD_ID:
- pid = find_vpid(event->sigev_notify_thread_id);
- rtn = pid_task(pid, PIDTYPE_PID);
- if (!rtn || !same_thread_group(rtn, current))
- return NULL;
- fallthrough;
- case SIGEV_SIGNAL:
- case SIGEV_THREAD:
- if (event->sigev_signo <= 0 || event->sigev_signo > SIGRTMAX)
- return NULL;
- fallthrough;
- case SIGEV_NONE:
- return pid;
- default:
- return NULL;
- }
- }
- static struct k_itimer * alloc_posix_timer(void)
- {
- struct k_itimer *tmr;
- tmr = kmem_cache_zalloc(posix_timers_cache, GFP_KERNEL);
- if (!tmr)
- return tmr;
- if (unlikely(!(tmr->sigq = sigqueue_alloc()))) {
- kmem_cache_free(posix_timers_cache, tmr);
- return NULL;
- }
- clear_siginfo(&tmr->sigq->info);
- return tmr;
- }
- static void k_itimer_rcu_free(struct rcu_head *head)
- {
- struct k_itimer *tmr = container_of(head, struct k_itimer, rcu);
- kmem_cache_free(posix_timers_cache, tmr);
- }
- #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;
- spin_lock_irqsave(&hash_lock, flags);
- hlist_del_rcu(&tmr->t_hash);
- spin_unlock_irqrestore(&hash_lock, flags);
- }
- put_pid(tmr->it_pid);
- sigqueue_free(tmr->sigq);
- call_rcu(&tmr->rcu, k_itimer_rcu_free);
- }
- static int common_timer_create(struct k_itimer *new_timer)
- {
- hrtimer_init(&new_timer->it.real.timer, new_timer->it_clock, 0);
- return 0;
- }
- /* Create a POSIX.1b interval timer. */
- static int do_timer_create(clockid_t which_clock, struct sigevent *event,
- timer_t __user *created_timer_id)
- {
- const struct k_clock *kc = clockid_to_kclock(which_clock);
- struct k_itimer *new_timer;
- int error, new_timer_id;
- int it_id_set = IT_ID_NOT_SET;
- if (!kc)
- return -EINVAL;
- if (!kc->timer_create)
- return -EOPNOTSUPP;
- new_timer = alloc_posix_timer();
- if (unlikely(!new_timer))
- return -EAGAIN;
- spin_lock_init(&new_timer->it_lock);
- new_timer_id = posix_timer_add(new_timer);
- if (new_timer_id < 0) {
- error = new_timer_id;
- goto out;
- }
- it_id_set = IT_ID_SET;
- new_timer->it_id = (timer_t) new_timer_id;
- new_timer->it_clock = which_clock;
- new_timer->kclock = kc;
- new_timer->it_overrun = -1LL;
- if (event) {
- rcu_read_lock();
- new_timer->it_pid = get_pid(good_sigevent(event));
- rcu_read_unlock();
- if (!new_timer->it_pid) {
- error = -EINVAL;
- goto out;
- }
- 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;
- } else {
- new_timer->it_sigev_notify = SIGEV_SIGNAL;
- new_timer->sigq->info.si_signo = SIGALRM;
- memset(&new_timer->sigq->info.si_value, 0, sizeof(sigval_t));
- new_timer->sigq->info.si_value.sival_int = new_timer->it_id;
- new_timer->it_pid = get_pid(task_tgid(current));
- }
- new_timer->sigq->info.si_tid = new_timer->it_id;
- new_timer->sigq->info.si_code = SI_TIMER;
- if (copy_to_user(created_timer_id,
- &new_timer_id, sizeof (new_timer_id))) {
- error = -EFAULT;
- goto out;
- }
- error = kc->timer_create(new_timer);
- if (error)
- goto out;
- spin_lock_irq(¤t->sighand->siglock);
- new_timer->it_signal = current->signal;
- list_add(&new_timer->list, ¤t->signal->posix_timers);
- spin_unlock_irq(¤t->sighand->siglock);
- return 0;
- /*
- * 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:
- release_posix_timer(new_timer, it_id_set);
- return error;
- }
- SYSCALL_DEFINE3(timer_create, const clockid_t, which_clock,
- struct sigevent __user *, timer_event_spec,
- timer_t __user *, created_timer_id)
- {
- if (timer_event_spec) {
- sigevent_t event;
- if (copy_from_user(&event, timer_event_spec, sizeof (event)))
- return -EFAULT;
- return do_timer_create(which_clock, &event, created_timer_id);
- }
- return do_timer_create(which_clock, NULL, created_timer_id);
- }
- #ifdef CONFIG_COMPAT
- COMPAT_SYSCALL_DEFINE3(timer_create, clockid_t, which_clock,
- struct compat_sigevent __user *, timer_event_spec,
- timer_t __user *, created_timer_id)
- {
- if (timer_event_spec) {
- sigevent_t event;
- if (get_compat_sigevent(&event, timer_event_spec))
- return -EFAULT;
- return do_timer_create(which_clock, &event, created_timer_id);
- }
- return do_timer_create(which_clock, NULL, created_timer_id);
- }
- #endif
- /*
- * 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.
- */
- static struct k_itimer *__lock_timer(timer_t timer_id, unsigned long *flags)
- {
- struct k_itimer *timr;
- /*
- * 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;
- rcu_read_lock();
- timr = posix_timer_by_id(timer_id);
- if (timr) {
- spin_lock_irqsave(&timr->it_lock, *flags);
- if (timr->it_signal == current->signal) {
- rcu_read_unlock();
- return timr;
- }
- spin_unlock_irqrestore(&timr->it_lock, *flags);
- }
- rcu_read_unlock();
- return NULL;
- }
- 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 s64 common_hrtimer_forward(struct k_itimer *timr, ktime_t now)
- {
- struct hrtimer *timer = &timr->it.real.timer;
- return hrtimer_forward(timer, now, timr->it_interval);
- }
- /*
- * 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.
- */
- void common_timer_get(struct k_itimer *timr, struct itimerspec64 *cur_setting)
- {
- const struct k_clock *kc = timr->kclock;
- ktime_t now, remaining, iv;
- bool sig_none;
- sig_none = timr->it_sigev_notify == SIGEV_NONE;
- iv = timr->it_interval;
- /* interval timer ? */
- if (iv) {
- cur_setting->it_interval = ktime_to_timespec64(iv);
- } else if (!timr->it_active) {
- /*
- * SIGEV_NONE oneshot timers are never queued. Check them
- * below.
- */
- if (!sig_none)
- return;
- }
- now = kc->clock_get_ktime(timr->it_clock);
- /*
- * When a requeue is pending or this is a SIGEV_NONE timer move the
- * expiry time forward by intervals, so expiry is > now.
- */
- if (iv && (timr->it_requeue_pending & REQUEUE_PENDING || sig_none))
- timr->it_overrun += kc->timer_forward(timr, now);
- remaining = kc->timer_remaining(timr, now);
- /* Return 0 only, when the timer is expired and not pending */
- if (remaining <= 0) {
- /*
- * A single shot SIGEV_NONE timer must return 0, when
- * it is expired !
- */
- if (!sig_none)
- cur_setting->it_value.tv_nsec = 1;
- } else {
- cur_setting->it_value = ktime_to_timespec64(remaining);
- }
- }
- /* Get the time remaining on a POSIX.1b interval timer. */
- static int do_timer_gettime(timer_t timer_id, struct itimerspec64 *setting)
- {
- struct k_itimer *timr;
- const struct k_clock *kc;
- unsigned long flags;
- int ret = 0;
- timr = lock_timer(timer_id, &flags);
- if (!timr)
- return -EINVAL;
- memset(setting, 0, sizeof(*setting));
- kc = timr->kclock;
- if (WARN_ON_ONCE(!kc || !kc->timer_get))
- ret = -EINVAL;
- else
- kc->timer_get(timr, setting);
- unlock_timer(timr, flags);
- return ret;
- }
- /* Get the time remaining on a POSIX.1b interval timer. */
- SYSCALL_DEFINE2(timer_gettime, timer_t, timer_id,
- struct __kernel_itimerspec __user *, setting)
- {
- struct itimerspec64 cur_setting;
- int ret = do_timer_gettime(timer_id, &cur_setting);
- if (!ret) {
- if (put_itimerspec64(&cur_setting, setting))
- ret = -EFAULT;
- }
- return ret;
- }
- #ifdef CONFIG_COMPAT_32BIT_TIME
- SYSCALL_DEFINE2(timer_gettime32, timer_t, timer_id,
- struct old_itimerspec32 __user *, setting)
- {
- struct itimerspec64 cur_setting;
- int ret = do_timer_gettime(timer_id, &cur_setting);
- if (!ret) {
- if (put_old_itimerspec32(&cur_setting, setting))
- ret = -EFAULT;
- }
- return ret;
- }
- #endif
- /*
- * 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
- * the call back to posixtimer_rearm(). So all we need to do is
- * to pick up the frozen overrun.
- */
- SYSCALL_DEFINE1(timer_getoverrun, timer_t, timer_id)
- {
- struct k_itimer *timr;
- int overrun;
- unsigned long flags;
- timr = lock_timer(timer_id, &flags);
- if (!timr)
- return -EINVAL;
- overrun = timer_overrun_to_int(timr, 0);
- unlock_timer(timr, flags);
- return overrun;
- }
- 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;
- /*
- * 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;
- 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);
- }
- static void common_timer_wait_running(struct k_itimer *timer)
- {
- hrtimer_cancel_wait_running(&timer->it.real.timer);
- }
- /*
- * On PREEMPT_RT this prevent priority inversion against softirq kthread in
- * case it gets preempted while executing a timer callback. See comments in
- * hrtimer_cancel_wait_running. For PREEMPT_RT=n this just results in a
- * cpu_relax().
- */
- static struct k_itimer *timer_wait_running(struct k_itimer *timer,
- unsigned long *flags)
- {
- const struct k_clock *kc = READ_ONCE(timer->kclock);
- timer_t timer_id = READ_ONCE(timer->it_id);
- /* Prevent kfree(timer) after dropping the lock */
- rcu_read_lock();
- unlock_timer(timer, *flags);
- /*
- * kc->timer_wait_running() might drop RCU lock. So @timer
- * cannot be touched anymore after the function returns!
- */
- if (!WARN_ON_ONCE(!kc->timer_wait_running))
- kc->timer_wait_running(timer);
- rcu_read_unlock();
- /* Relock the timer. It might be not longer hashed. */
- return lock_timer(timer_id, flags);
- }
- /* Set a POSIX.1b interval timer. */
- int common_timer_set(struct k_itimer *timr, int flags,
- struct itimerspec64 *new_setting,
- struct itimerspec64 *old_setting)
- {
- const struct k_clock *kc = timr->kclock;
- bool sigev_none;
- ktime_t expires;
- if (old_setting)
- common_timer_get(timr, old_setting);
- /* Prevent rearming by clearing the interval */
- timr->it_interval = 0;
- /*
- * Careful here. On SMP systems the timer expiry function could be
- * active and spinning on timr->it_lock.
- */
- if (kc->timer_try_to_cancel(timr) < 0)
- return TIMER_RETRY;
- timr->it_active = 0;
- timr->it_requeue_pending = (timr->it_requeue_pending + 2) &
- ~REQUEUE_PENDING;
- timr->it_overrun_last = 0;
- /* Switch off the timer when it_value is zero */
- if (!new_setting->it_value.tv_sec && !new_setting->it_value.tv_nsec)
- return 0;
- timr->it_interval = timespec64_to_ktime(new_setting->it_interval);
- expires = timespec64_to_ktime(new_setting->it_value);
- if (flags & TIMER_ABSTIME)
- expires = timens_ktime_to_host(timr->it_clock, expires);
- sigev_none = timr->it_sigev_notify == SIGEV_NONE;
- kc->timer_arm(timr, expires, flags & TIMER_ABSTIME, sigev_none);
- timr->it_active = !sigev_none;
- return 0;
- }
- static int do_timer_settime(timer_t timer_id, int tmr_flags,
- struct itimerspec64 *new_spec64,
- struct itimerspec64 *old_spec64)
- {
- const struct k_clock *kc;
- struct k_itimer *timr;
- unsigned long flags;
- int error = 0;
- if (!timespec64_valid(&new_spec64->it_interval) ||
- !timespec64_valid(&new_spec64->it_value))
- return -EINVAL;
- if (old_spec64)
- memset(old_spec64, 0, sizeof(*old_spec64));
- timr = lock_timer(timer_id, &flags);
- retry:
- if (!timr)
- return -EINVAL;
- kc = timr->kclock;
- if (WARN_ON_ONCE(!kc || !kc->timer_set))
- error = -EINVAL;
- else
- error = kc->timer_set(timr, tmr_flags, new_spec64, old_spec64);
- if (error == TIMER_RETRY) {
- // We already got the old time...
- old_spec64 = NULL;
- /* Unlocks and relocks the timer if it still exists */
- timr = timer_wait_running(timr, &flags);
- goto retry;
- }
- unlock_timer(timr, flags);
- return error;
- }
- /* Set a POSIX.1b interval timer */
- SYSCALL_DEFINE4(timer_settime, timer_t, timer_id, int, flags,
- const struct __kernel_itimerspec __user *, new_setting,
- struct __kernel_itimerspec __user *, old_setting)
- {
- struct itimerspec64 new_spec, old_spec;
- struct itimerspec64 *rtn = old_setting ? &old_spec : NULL;
- int error = 0;
- if (!new_setting)
- return -EINVAL;
- if (get_itimerspec64(&new_spec, new_setting))
- return -EFAULT;
- error = do_timer_settime(timer_id, flags, &new_spec, rtn);
- if (!error && old_setting) {
- if (put_itimerspec64(&old_spec, old_setting))
- error = -EFAULT;
- }
- return error;
- }
- #ifdef CONFIG_COMPAT_32BIT_TIME
- SYSCALL_DEFINE4(timer_settime32, timer_t, timer_id, int, flags,
- struct old_itimerspec32 __user *, new,
- struct old_itimerspec32 __user *, old)
- {
- struct itimerspec64 new_spec, old_spec;
- struct itimerspec64 *rtn = old ? &old_spec : NULL;
- int error = 0;
- if (!new)
- return -EINVAL;
- if (get_old_itimerspec32(&new_spec, new))
- return -EFAULT;
- error = do_timer_settime(timer_id, flags, &new_spec, rtn);
- if (!error && old) {
- if (put_old_itimerspec32(&old_spec, old))
- error = -EFAULT;
- }
- return error;
- }
- #endif
- int common_timer_del(struct k_itimer *timer)
- {
- const struct k_clock *kc = timer->kclock;
- timer->it_interval = 0;
- if (kc->timer_try_to_cancel(timer) < 0)
- return TIMER_RETRY;
- timer->it_active = 0;
- return 0;
- }
- static inline int timer_delete_hook(struct k_itimer *timer)
- {
- const struct k_clock *kc = timer->kclock;
- if (WARN_ON_ONCE(!kc || !kc->timer_del))
- return -EINVAL;
- return kc->timer_del(timer);
- }
- /* Delete a POSIX.1b interval timer. */
- SYSCALL_DEFINE1(timer_delete, timer_t, timer_id)
- {
- struct k_itimer *timer;
- unsigned long flags;
- timer = lock_timer(timer_id, &flags);
- retry_delete:
- if (!timer)
- return -EINVAL;
- if (unlikely(timer_delete_hook(timer) == TIMER_RETRY)) {
- /* Unlocks and relocks the timer if it still exists */
- timer = timer_wait_running(timer, &flags);
- goto retry_delete;
- }
- spin_lock(¤t->sighand->siglock);
- list_del(&timer->list);
- spin_unlock(¤t->sighand->siglock);
- /*
- * This keeps any tasks waiting on the spin lock from thinking
- * they got something (see the lock code above).
- */
- timer->it_signal = NULL;
- unlock_timer(timer, flags);
- release_posix_timer(timer, IT_ID_SET);
- return 0;
- }
- /*
- * Delete a timer if it is armed, remove it from the hash and schedule it
- * for RCU freeing.
- */
- static void itimer_delete(struct k_itimer *timer)
- {
- unsigned long flags;
- /*
- * irqsave is required to make timer_wait_running() work.
- */
- spin_lock_irqsave(&timer->it_lock, flags);
- retry_delete:
- /*
- * Even if the timer is not longer accessible from other tasks
- * it still might be armed and queued in the underlying timer
- * mechanism. Worse, that timer mechanism might run the expiry
- * function concurrently.
- */
- if (timer_delete_hook(timer) == TIMER_RETRY) {
- /*
- * Timer is expired concurrently, prevent livelocks
- * and pointless spinning on RT.
- *
- * timer_wait_running() drops timer::it_lock, which opens
- * the possibility for another task to delete the timer.
- *
- * That's not possible here because this is invoked from
- * do_exit() only for the last thread of the thread group.
- * So no other task can access and delete that timer.
- */
- if (WARN_ON_ONCE(timer_wait_running(timer, &flags) != timer))
- return;
- goto retry_delete;
- }
- list_del(&timer->list);
- spin_unlock_irqrestore(&timer->it_lock, flags);
- release_posix_timer(timer, IT_ID_SET);
- }
- /*
- * Invoked from do_exit() when the last thread of a thread group exits.
- * At that point no other task can access the timers of the dying
- * task anymore.
- */
- void exit_itimers(struct task_struct *tsk)
- {
- struct list_head timers;
- struct k_itimer *tmr;
- if (list_empty(&tsk->signal->posix_timers))
- return;
- /* Protect against concurrent read via /proc/$PID/timers */
- spin_lock_irq(&tsk->sighand->siglock);
- list_replace_init(&tsk->signal->posix_timers, &timers);
- spin_unlock_irq(&tsk->sighand->siglock);
- /* The timers are not longer accessible via tsk::signal */
- while (!list_empty(&timers)) {
- tmr = list_first_entry(&timers, struct k_itimer, list);
- itimer_delete(tmr);
- }
- }
- SYSCALL_DEFINE2(clock_settime, const clockid_t, which_clock,
- const struct __kernel_timespec __user *, tp)
- {
- const struct k_clock *kc = clockid_to_kclock(which_clock);
- struct timespec64 new_tp;
- if (!kc || !kc->clock_set)
- return -EINVAL;
- if (get_timespec64(&new_tp, tp))
- return -EFAULT;
- return kc->clock_set(which_clock, &new_tp);
- }
- SYSCALL_DEFINE2(clock_gettime, const clockid_t, which_clock,
- struct __kernel_timespec __user *, tp)
- {
- const struct k_clock *kc = clockid_to_kclock(which_clock);
- struct timespec64 kernel_tp;
- int error;
- if (!kc)
- return -EINVAL;
- error = kc->clock_get_timespec(which_clock, &kernel_tp);
- if (!error && put_timespec64(&kernel_tp, tp))
- error = -EFAULT;
- return error;
- }
- int do_clock_adjtime(const clockid_t which_clock, struct __kernel_timex * ktx)
- {
- const struct k_clock *kc = clockid_to_kclock(which_clock);
- if (!kc)
- return -EINVAL;
- if (!kc->clock_adj)
- return -EOPNOTSUPP;
- return kc->clock_adj(which_clock, ktx);
- }
- SYSCALL_DEFINE2(clock_adjtime, const clockid_t, which_clock,
- struct __kernel_timex __user *, utx)
- {
- struct __kernel_timex ktx;
- int err;
- if (copy_from_user(&ktx, utx, sizeof(ktx)))
- return -EFAULT;
- err = do_clock_adjtime(which_clock, &ktx);
- if (err >= 0 && copy_to_user(utx, &ktx, sizeof(ktx)))
- return -EFAULT;
- return err;
- }
- SYSCALL_DEFINE2(clock_getres, const clockid_t, which_clock,
- struct __kernel_timespec __user *, tp)
- {
- const struct k_clock *kc = clockid_to_kclock(which_clock);
- struct timespec64 rtn_tp;
- int error;
- if (!kc)
- return -EINVAL;
- error = kc->clock_getres(which_clock, &rtn_tp);
- if (!error && tp && put_timespec64(&rtn_tp, tp))
- error = -EFAULT;
- return error;
- }
- #ifdef CONFIG_COMPAT_32BIT_TIME
- SYSCALL_DEFINE2(clock_settime32, clockid_t, which_clock,
- struct old_timespec32 __user *, tp)
- {
- const struct k_clock *kc = clockid_to_kclock(which_clock);
- struct timespec64 ts;
- if (!kc || !kc->clock_set)
- return -EINVAL;
- if (get_old_timespec32(&ts, tp))
- return -EFAULT;
- return kc->clock_set(which_clock, &ts);
- }
- SYSCALL_DEFINE2(clock_gettime32, clockid_t, which_clock,
- struct old_timespec32 __user *, tp)
- {
- const struct k_clock *kc = clockid_to_kclock(which_clock);
- struct timespec64 ts;
- int err;
- if (!kc)
- return -EINVAL;
- err = kc->clock_get_timespec(which_clock, &ts);
- if (!err && put_old_timespec32(&ts, tp))
- err = -EFAULT;
- return err;
- }
- SYSCALL_DEFINE2(clock_adjtime32, clockid_t, which_clock,
- struct old_timex32 __user *, utp)
- {
- struct __kernel_timex ktx;
- int err;
- err = get_old_timex32(&ktx, utp);
- if (err)
- return err;
- err = do_clock_adjtime(which_clock, &ktx);
- if (err >= 0 && put_old_timex32(utp, &ktx))
- return -EFAULT;
- return err;
- }
- SYSCALL_DEFINE2(clock_getres_time32, clockid_t, which_clock,
- struct old_timespec32 __user *, tp)
- {
- const struct k_clock *kc = clockid_to_kclock(which_clock);
- struct timespec64 ts;
- int err;
- if (!kc)
- return -EINVAL;
- err = kc->clock_getres(which_clock, &ts);
- if (!err && tp && put_old_timespec32(&ts, tp))
- return -EFAULT;
- return err;
- }
- #endif
- /*
- * nanosleep for monotonic and realtime clocks
- */
- static int common_nsleep(const clockid_t which_clock, int flags,
- const struct timespec64 *rqtp)
- {
- ktime_t texp = timespec64_to_ktime(*rqtp);
- return hrtimer_nanosleep(texp, flags & TIMER_ABSTIME ?
- HRTIMER_MODE_ABS : HRTIMER_MODE_REL,
- which_clock);
- }
- static int common_nsleep_timens(const clockid_t which_clock, int flags,
- const struct timespec64 *rqtp)
- {
- ktime_t texp = timespec64_to_ktime(*rqtp);
- if (flags & TIMER_ABSTIME)
- texp = timens_ktime_to_host(which_clock, texp);
- return hrtimer_nanosleep(texp, flags & TIMER_ABSTIME ?
- HRTIMER_MODE_ABS : HRTIMER_MODE_REL,
- which_clock);
- }
- SYSCALL_DEFINE4(clock_nanosleep, const clockid_t, which_clock, int, flags,
- const struct __kernel_timespec __user *, rqtp,
- struct __kernel_timespec __user *, rmtp)
- {
- const struct k_clock *kc = clockid_to_kclock(which_clock);
- struct timespec64 t;
- if (!kc)
- return -EINVAL;
- if (!kc->nsleep)
- return -EOPNOTSUPP;
- if (get_timespec64(&t, rqtp))
- return -EFAULT;
- if (!timespec64_valid(&t))
- return -EINVAL;
- if (flags & TIMER_ABSTIME)
- rmtp = NULL;
- current->restart_block.fn = do_no_restart_syscall;
- current->restart_block.nanosleep.type = rmtp ? TT_NATIVE : TT_NONE;
- current->restart_block.nanosleep.rmtp = rmtp;
- return kc->nsleep(which_clock, flags, &t);
- }
- #ifdef CONFIG_COMPAT_32BIT_TIME
- SYSCALL_DEFINE4(clock_nanosleep_time32, clockid_t, which_clock, int, flags,
- struct old_timespec32 __user *, rqtp,
- struct old_timespec32 __user *, rmtp)
- {
- const struct k_clock *kc = clockid_to_kclock(which_clock);
- struct timespec64 t;
- if (!kc)
- return -EINVAL;
- if (!kc->nsleep)
- return -EOPNOTSUPP;
- if (get_old_timespec32(&t, rqtp))
- return -EFAULT;
- if (!timespec64_valid(&t))
- return -EINVAL;
- if (flags & TIMER_ABSTIME)
- rmtp = NULL;
- current->restart_block.fn = do_no_restart_syscall;
- current->restart_block.nanosleep.type = rmtp ? TT_COMPAT : TT_NONE;
- current->restart_block.nanosleep.compat_rmtp = rmtp;
- return kc->nsleep(which_clock, flags, &t);
- }
- #endif
- static const struct k_clock clock_realtime = {
- .clock_getres = posix_get_hrtimer_res,
- .clock_get_timespec = posix_get_realtime_timespec,
- .clock_get_ktime = posix_get_realtime_ktime,
- .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_wait_running = common_timer_wait_running,
- .timer_arm = common_hrtimer_arm,
- };
- static const struct k_clock clock_monotonic = {
- .clock_getres = posix_get_hrtimer_res,
- .clock_get_timespec = posix_get_monotonic_timespec,
- .clock_get_ktime = posix_get_monotonic_ktime,
- .nsleep = common_nsleep_timens,
- .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_wait_running = common_timer_wait_running,
- .timer_arm = common_hrtimer_arm,
- };
- static const struct k_clock clock_monotonic_raw = {
- .clock_getres = posix_get_hrtimer_res,
- .clock_get_timespec = posix_get_monotonic_raw,
- };
- static const struct k_clock clock_realtime_coarse = {
- .clock_getres = posix_get_coarse_res,
- .clock_get_timespec = posix_get_realtime_coarse,
- };
- static const struct k_clock clock_monotonic_coarse = {
- .clock_getres = posix_get_coarse_res,
- .clock_get_timespec = posix_get_monotonic_coarse,
- };
- static const struct k_clock clock_tai = {
- .clock_getres = posix_get_hrtimer_res,
- .clock_get_ktime = posix_get_tai_ktime,
- .clock_get_timespec = posix_get_tai_timespec,
- .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_wait_running = common_timer_wait_running,
- .timer_arm = common_hrtimer_arm,
- };
- static const struct k_clock clock_boottime = {
- .clock_getres = posix_get_hrtimer_res,
- .clock_get_ktime = posix_get_boottime_ktime,
- .clock_get_timespec = posix_get_boottime_timespec,
- .nsleep = common_nsleep_timens,
- .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_wait_running = common_timer_wait_running,
- .timer_arm = common_hrtimer_arm,
- };
- 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)
- {
- clockid_t idx = id;
- if (id < 0) {
- return (id & CLOCKFD_MASK) == CLOCKFD ?
- &clock_posix_dynamic : &clock_posix_cpu;
- }
- if (id >= ARRAY_SIZE(posix_clocks))
- return NULL;
- return posix_clocks[array_index_nospec(idx, ARRAY_SIZE(posix_clocks))];
- }
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