15cee9645SThomas Gleixner /* 25cee9645SThomas Gleixner * linux/kernel/posix-timers.c 35cee9645SThomas Gleixner * 45cee9645SThomas Gleixner * 55cee9645SThomas Gleixner * 2002-10-15 Posix Clocks & timers 65cee9645SThomas Gleixner * by George Anzinger george@mvista.com 75cee9645SThomas Gleixner * 85cee9645SThomas Gleixner * Copyright (C) 2002 2003 by MontaVista Software. 95cee9645SThomas Gleixner * 105cee9645SThomas Gleixner * 2004-06-01 Fix CLOCK_REALTIME clock/timer TIMER_ABSTIME bug. 115cee9645SThomas Gleixner * Copyright (C) 2004 Boris Hu 125cee9645SThomas Gleixner * 135cee9645SThomas Gleixner * This program is free software; you can redistribute it and/or modify 145cee9645SThomas Gleixner * it under the terms of the GNU General Public License as published by 155cee9645SThomas Gleixner * the Free Software Foundation; either version 2 of the License, or (at 165cee9645SThomas Gleixner * your option) any later version. 175cee9645SThomas Gleixner * 185cee9645SThomas Gleixner * This program is distributed in the hope that it will be useful, but 195cee9645SThomas Gleixner * WITHOUT ANY WARRANTY; without even the implied warranty of 205cee9645SThomas Gleixner * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 215cee9645SThomas Gleixner * General Public License for more details. 225cee9645SThomas Gleixner 235cee9645SThomas Gleixner * You should have received a copy of the GNU General Public License 245cee9645SThomas Gleixner * along with this program; if not, write to the Free Software 255cee9645SThomas Gleixner * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 265cee9645SThomas Gleixner * 275cee9645SThomas Gleixner * MontaVista Software | 1237 East Arques Avenue | Sunnyvale | CA 94085 | USA 285cee9645SThomas Gleixner */ 295cee9645SThomas Gleixner 305cee9645SThomas Gleixner /* These are all the functions necessary to implement 315cee9645SThomas Gleixner * POSIX clocks & timers 325cee9645SThomas Gleixner */ 335cee9645SThomas Gleixner #include <linux/mm.h> 345cee9645SThomas Gleixner #include <linux/interrupt.h> 355cee9645SThomas Gleixner #include <linux/slab.h> 365cee9645SThomas Gleixner #include <linux/time.h> 375cee9645SThomas Gleixner #include <linux/mutex.h> 3861855b6bSIngo Molnar #include <linux/sched/task.h> 395cee9645SThomas Gleixner 407c0f6ba6SLinus Torvalds #include <linux/uaccess.h> 415cee9645SThomas Gleixner #include <linux/list.h> 425cee9645SThomas Gleixner #include <linux/init.h> 435cee9645SThomas Gleixner #include <linux/compiler.h> 445cee9645SThomas Gleixner #include <linux/hash.h> 455cee9645SThomas Gleixner #include <linux/posix-clock.h> 465cee9645SThomas Gleixner #include <linux/posix-timers.h> 475cee9645SThomas Gleixner #include <linux/syscalls.h> 485cee9645SThomas Gleixner #include <linux/wait.h> 495cee9645SThomas Gleixner #include <linux/workqueue.h> 505cee9645SThomas Gleixner #include <linux/export.h> 515cee9645SThomas Gleixner #include <linux/hashtable.h> 52edbeda46SAl Viro #include <linux/compat.h> 535cee9645SThomas Gleixner 548b094cd0SThomas Gleixner #include "timekeeping.h" 55bab0aae9SThomas Gleixner #include "posix-timers.h" 568b094cd0SThomas Gleixner 575cee9645SThomas Gleixner /* 585cee9645SThomas Gleixner * Management arrays for POSIX timers. Timers are now kept in static hash table 595cee9645SThomas Gleixner * with 512 entries. 605cee9645SThomas Gleixner * Timer ids are allocated by local routine, which selects proper hash head by 615cee9645SThomas Gleixner * key, constructed from current->signal address and per signal struct counter. 625cee9645SThomas Gleixner * This keeps timer ids unique per process, but now they can intersect between 635cee9645SThomas Gleixner * processes. 645cee9645SThomas Gleixner */ 655cee9645SThomas Gleixner 665cee9645SThomas Gleixner /* 675cee9645SThomas Gleixner * Lets keep our timers in a slab cache :-) 685cee9645SThomas Gleixner */ 695cee9645SThomas Gleixner static struct kmem_cache *posix_timers_cache; 705cee9645SThomas Gleixner 715cee9645SThomas Gleixner static DEFINE_HASHTABLE(posix_timers_hashtable, 9); 725cee9645SThomas Gleixner static DEFINE_SPINLOCK(hash_lock); 735cee9645SThomas Gleixner 746631fa12SThomas Gleixner static const struct k_clock * const posix_clocks[]; 756631fa12SThomas Gleixner static const struct k_clock *clockid_to_kclock(const clockid_t id); 7667edab48SThomas Gleixner static const struct k_clock clock_realtime, clock_monotonic; 776631fa12SThomas Gleixner 785cee9645SThomas Gleixner /* 795cee9645SThomas Gleixner * we assume that the new SIGEV_THREAD_ID shares no bits with the other 805cee9645SThomas Gleixner * SIGEV values. Here we put out an error if this assumption fails. 815cee9645SThomas Gleixner */ 825cee9645SThomas Gleixner #if SIGEV_THREAD_ID != (SIGEV_THREAD_ID & \ 835cee9645SThomas Gleixner ~(SIGEV_SIGNAL | SIGEV_NONE | SIGEV_THREAD)) 845cee9645SThomas Gleixner #error "SIGEV_THREAD_ID must not share bit with other SIGEV values!" 855cee9645SThomas Gleixner #endif 865cee9645SThomas Gleixner 875cee9645SThomas Gleixner /* 885cee9645SThomas Gleixner * parisc wants ENOTSUP instead of EOPNOTSUPP 895cee9645SThomas Gleixner */ 905cee9645SThomas Gleixner #ifndef ENOTSUP 915cee9645SThomas Gleixner # define ENANOSLEEP_NOTSUP EOPNOTSUPP 925cee9645SThomas Gleixner #else 935cee9645SThomas Gleixner # define ENANOSLEEP_NOTSUP ENOTSUP 945cee9645SThomas Gleixner #endif 955cee9645SThomas Gleixner 965cee9645SThomas Gleixner /* 975cee9645SThomas Gleixner * The timer ID is turned into a timer address by idr_find(). 985cee9645SThomas Gleixner * Verifying a valid ID consists of: 995cee9645SThomas Gleixner * 1005cee9645SThomas Gleixner * a) checking that idr_find() returns other than -1. 1015cee9645SThomas Gleixner * b) checking that the timer id matches the one in the timer itself. 1025cee9645SThomas Gleixner * c) that the timer owner is in the callers thread group. 1035cee9645SThomas Gleixner */ 1045cee9645SThomas Gleixner 1055cee9645SThomas Gleixner /* 1065cee9645SThomas Gleixner * CLOCKs: The POSIX standard calls for a couple of clocks and allows us 1075cee9645SThomas Gleixner * to implement others. This structure defines the various 1085cee9645SThomas Gleixner * clocks. 1095cee9645SThomas Gleixner * 1105cee9645SThomas Gleixner * RESOLUTION: Clock resolution is used to round up timer and interval 1115cee9645SThomas Gleixner * times, NOT to report clock times, which are reported with as 1125cee9645SThomas Gleixner * much resolution as the system can muster. In some cases this 1135cee9645SThomas Gleixner * resolution may depend on the underlying clock hardware and 1145cee9645SThomas Gleixner * may not be quantifiable until run time, and only then is the 1155cee9645SThomas Gleixner * necessary code is written. The standard says we should say 1165cee9645SThomas Gleixner * something about this issue in the documentation... 1175cee9645SThomas Gleixner * 1185cee9645SThomas Gleixner * FUNCTIONS: The CLOCKs structure defines possible functions to 1195cee9645SThomas Gleixner * handle various clock functions. 1205cee9645SThomas Gleixner * 1215cee9645SThomas Gleixner * The standard POSIX timer management code assumes the 1225cee9645SThomas Gleixner * following: 1.) The k_itimer struct (sched.h) is used for 1235cee9645SThomas Gleixner * the timer. 2.) The list, it_lock, it_clock, it_id and 1245cee9645SThomas Gleixner * it_pid fields are not modified by timer code. 1255cee9645SThomas Gleixner * 1265cee9645SThomas Gleixner * Permissions: It is assumed that the clock_settime() function defined 1275cee9645SThomas Gleixner * for each clock will take care of permission checks. Some 1285cee9645SThomas Gleixner * clocks may be set able by any user (i.e. local process 1295cee9645SThomas Gleixner * clocks) others not. Currently the only set able clock we 1305cee9645SThomas Gleixner * have is CLOCK_REALTIME and its high res counter part, both of 1315cee9645SThomas Gleixner * which we beg off on and pass to do_sys_settimeofday(). 1325cee9645SThomas Gleixner */ 1335cee9645SThomas Gleixner static struct k_itimer *__lock_timer(timer_t timer_id, unsigned long *flags); 1345cee9645SThomas Gleixner 1355cee9645SThomas Gleixner #define lock_timer(tid, flags) \ 1365cee9645SThomas Gleixner ({ struct k_itimer *__timr; \ 1375cee9645SThomas Gleixner __cond_lock(&__timr->it_lock, __timr = __lock_timer(tid, flags)); \ 1385cee9645SThomas Gleixner __timr; \ 1395cee9645SThomas Gleixner }) 1405cee9645SThomas Gleixner 1415cee9645SThomas Gleixner static int hash(struct signal_struct *sig, unsigned int nr) 1425cee9645SThomas Gleixner { 1435cee9645SThomas Gleixner return hash_32(hash32_ptr(sig) ^ nr, HASH_BITS(posix_timers_hashtable)); 1445cee9645SThomas Gleixner } 1455cee9645SThomas Gleixner 1465cee9645SThomas Gleixner static struct k_itimer *__posix_timers_find(struct hlist_head *head, 1475cee9645SThomas Gleixner struct signal_struct *sig, 1485cee9645SThomas Gleixner timer_t id) 1495cee9645SThomas Gleixner { 1505cee9645SThomas Gleixner struct k_itimer *timer; 1515cee9645SThomas Gleixner 1525cee9645SThomas Gleixner hlist_for_each_entry_rcu(timer, head, t_hash) { 1535cee9645SThomas Gleixner if ((timer->it_signal == sig) && (timer->it_id == id)) 1545cee9645SThomas Gleixner return timer; 1555cee9645SThomas Gleixner } 1565cee9645SThomas Gleixner return NULL; 1575cee9645SThomas Gleixner } 1585cee9645SThomas Gleixner 1595cee9645SThomas Gleixner static struct k_itimer *posix_timer_by_id(timer_t id) 1605cee9645SThomas Gleixner { 1615cee9645SThomas Gleixner struct signal_struct *sig = current->signal; 1625cee9645SThomas Gleixner struct hlist_head *head = &posix_timers_hashtable[hash(sig, id)]; 1635cee9645SThomas Gleixner 1645cee9645SThomas Gleixner return __posix_timers_find(head, sig, id); 1655cee9645SThomas Gleixner } 1665cee9645SThomas Gleixner 1675cee9645SThomas Gleixner static int posix_timer_add(struct k_itimer *timer) 1685cee9645SThomas Gleixner { 1695cee9645SThomas Gleixner struct signal_struct *sig = current->signal; 1705cee9645SThomas Gleixner int first_free_id = sig->posix_timer_id; 1715cee9645SThomas Gleixner struct hlist_head *head; 1725cee9645SThomas Gleixner int ret = -ENOENT; 1735cee9645SThomas Gleixner 1745cee9645SThomas Gleixner do { 1755cee9645SThomas Gleixner spin_lock(&hash_lock); 1765cee9645SThomas Gleixner head = &posix_timers_hashtable[hash(sig, sig->posix_timer_id)]; 1775cee9645SThomas Gleixner if (!__posix_timers_find(head, sig, sig->posix_timer_id)) { 1785cee9645SThomas Gleixner hlist_add_head_rcu(&timer->t_hash, head); 1795cee9645SThomas Gleixner ret = sig->posix_timer_id; 1805cee9645SThomas Gleixner } 1815cee9645SThomas Gleixner if (++sig->posix_timer_id < 0) 1825cee9645SThomas Gleixner sig->posix_timer_id = 0; 1835cee9645SThomas Gleixner if ((sig->posix_timer_id == first_free_id) && (ret == -ENOENT)) 1845cee9645SThomas Gleixner /* Loop over all possible ids completed */ 1855cee9645SThomas Gleixner ret = -EAGAIN; 1865cee9645SThomas Gleixner spin_unlock(&hash_lock); 1875cee9645SThomas Gleixner } while (ret == -ENOENT); 1885cee9645SThomas Gleixner return ret; 1895cee9645SThomas Gleixner } 1905cee9645SThomas Gleixner 1915cee9645SThomas Gleixner static inline void unlock_timer(struct k_itimer *timr, unsigned long flags) 1925cee9645SThomas Gleixner { 1935cee9645SThomas Gleixner spin_unlock_irqrestore(&timr->it_lock, flags); 1945cee9645SThomas Gleixner } 1955cee9645SThomas Gleixner 1965cee9645SThomas Gleixner /* Get clock_realtime */ 1973c9c12f4SDeepa Dinamani static int posix_clock_realtime_get(clockid_t which_clock, struct timespec64 *tp) 1985cee9645SThomas Gleixner { 1993c9c12f4SDeepa Dinamani ktime_get_real_ts64(tp); 2005cee9645SThomas Gleixner return 0; 2015cee9645SThomas Gleixner } 2025cee9645SThomas Gleixner 2035cee9645SThomas Gleixner /* Set clock_realtime */ 2045cee9645SThomas Gleixner static int posix_clock_realtime_set(const clockid_t which_clock, 2050fe6afe3SDeepa Dinamani const struct timespec64 *tp) 2065cee9645SThomas Gleixner { 2070fe6afe3SDeepa Dinamani return do_sys_settimeofday64(tp, NULL); 2085cee9645SThomas Gleixner } 2095cee9645SThomas Gleixner 2105cee9645SThomas Gleixner static int posix_clock_realtime_adj(const clockid_t which_clock, 2115cee9645SThomas Gleixner struct timex *t) 2125cee9645SThomas Gleixner { 2135cee9645SThomas Gleixner return do_adjtimex(t); 2145cee9645SThomas Gleixner } 2155cee9645SThomas Gleixner 2165cee9645SThomas Gleixner /* 2175cee9645SThomas Gleixner * Get monotonic time for posix timers 2185cee9645SThomas Gleixner */ 2193c9c12f4SDeepa Dinamani static int posix_ktime_get_ts(clockid_t which_clock, struct timespec64 *tp) 2205cee9645SThomas Gleixner { 2213c9c12f4SDeepa Dinamani ktime_get_ts64(tp); 2225cee9645SThomas Gleixner return 0; 2235cee9645SThomas Gleixner } 2245cee9645SThomas Gleixner 2255cee9645SThomas Gleixner /* 2265cee9645SThomas Gleixner * Get monotonic-raw time for posix timers 2275cee9645SThomas Gleixner */ 2283c9c12f4SDeepa Dinamani static int posix_get_monotonic_raw(clockid_t which_clock, struct timespec64 *tp) 2295cee9645SThomas Gleixner { 2303c9c12f4SDeepa Dinamani getrawmonotonic64(tp); 2315cee9645SThomas Gleixner return 0; 2325cee9645SThomas Gleixner } 2335cee9645SThomas Gleixner 2345cee9645SThomas Gleixner 2353c9c12f4SDeepa Dinamani static int posix_get_realtime_coarse(clockid_t which_clock, struct timespec64 *tp) 2365cee9645SThomas Gleixner { 2373c9c12f4SDeepa Dinamani *tp = current_kernel_time64(); 2385cee9645SThomas Gleixner return 0; 2395cee9645SThomas Gleixner } 2405cee9645SThomas Gleixner 2415cee9645SThomas Gleixner static int posix_get_monotonic_coarse(clockid_t which_clock, 2423c9c12f4SDeepa Dinamani struct timespec64 *tp) 2435cee9645SThomas Gleixner { 2443c9c12f4SDeepa Dinamani *tp = get_monotonic_coarse64(); 2455cee9645SThomas Gleixner return 0; 2465cee9645SThomas Gleixner } 2475cee9645SThomas Gleixner 248d2e3e0caSDeepa Dinamani static int posix_get_coarse_res(const clockid_t which_clock, struct timespec64 *tp) 2495cee9645SThomas Gleixner { 250d2e3e0caSDeepa Dinamani *tp = ktime_to_timespec64(KTIME_LOW_RES); 2515cee9645SThomas Gleixner return 0; 2525cee9645SThomas Gleixner } 2535cee9645SThomas Gleixner 2543c9c12f4SDeepa Dinamani static int posix_get_boottime(const clockid_t which_clock, struct timespec64 *tp) 2555cee9645SThomas Gleixner { 2563c9c12f4SDeepa Dinamani get_monotonic_boottime64(tp); 2575cee9645SThomas Gleixner return 0; 2585cee9645SThomas Gleixner } 2595cee9645SThomas Gleixner 2603c9c12f4SDeepa Dinamani static int posix_get_tai(clockid_t which_clock, struct timespec64 *tp) 2615cee9645SThomas Gleixner { 2623c9c12f4SDeepa Dinamani timekeeping_clocktai64(tp); 2635cee9645SThomas Gleixner return 0; 2645cee9645SThomas Gleixner } 2655cee9645SThomas Gleixner 266d2e3e0caSDeepa Dinamani static int posix_get_hrtimer_res(clockid_t which_clock, struct timespec64 *tp) 267056a3cacSThomas Gleixner { 268056a3cacSThomas Gleixner tp->tv_sec = 0; 269056a3cacSThomas Gleixner tp->tv_nsec = hrtimer_resolution; 270056a3cacSThomas Gleixner return 0; 271056a3cacSThomas Gleixner } 272056a3cacSThomas Gleixner 273d3ba5a9aSChristoph Hellwig /* 274d3ba5a9aSChristoph Hellwig * Initialize everything, well, just everything in Posix clocks/timers ;) 275d3ba5a9aSChristoph Hellwig */ 276d3ba5a9aSChristoph Hellwig static __init int init_posix_timers(void) 277d3ba5a9aSChristoph Hellwig { 2785cee9645SThomas Gleixner posix_timers_cache = kmem_cache_create("posix_timers_cache", 2795cee9645SThomas Gleixner sizeof (struct k_itimer), 0, SLAB_PANIC, 2805cee9645SThomas Gleixner NULL); 2815cee9645SThomas Gleixner return 0; 2825cee9645SThomas Gleixner } 2835cee9645SThomas Gleixner __initcall(init_posix_timers); 2845cee9645SThomas Gleixner 285f37fb0aaSThomas Gleixner static void common_hrtimer_rearm(struct k_itimer *timr) 2865cee9645SThomas Gleixner { 2875cee9645SThomas Gleixner struct hrtimer *timer = &timr->it.real.timer; 2885cee9645SThomas Gleixner 28980105cd0SThomas Gleixner if (!timr->it_interval) 2905cee9645SThomas Gleixner return; 2915cee9645SThomas Gleixner 2925cee9645SThomas Gleixner timr->it_overrun += (unsigned int) hrtimer_forward(timer, 2935cee9645SThomas Gleixner timer->base->get_time(), 29480105cd0SThomas Gleixner timr->it_interval); 2955cee9645SThomas Gleixner hrtimer_restart(timer); 2965cee9645SThomas Gleixner } 2975cee9645SThomas Gleixner 2985cee9645SThomas Gleixner /* 2995cee9645SThomas Gleixner * This function is exported for use by the signal deliver code. It is 3005cee9645SThomas Gleixner * called just prior to the info block being released and passes that 3015cee9645SThomas Gleixner * block to us. It's function is to update the overrun entry AND to 3025cee9645SThomas Gleixner * restart the timer. It should only be called if the timer is to be 3035cee9645SThomas Gleixner * restarted (i.e. we have flagged this in the sys_private entry of the 3045cee9645SThomas Gleixner * info block). 3055cee9645SThomas Gleixner * 3065cee9645SThomas Gleixner * To protect against the timer going away while the interrupt is queued, 3075cee9645SThomas Gleixner * we require that the it_requeue_pending flag be set. 3085cee9645SThomas Gleixner */ 30996fe3b07SThomas Gleixner void posixtimer_rearm(struct siginfo *info) 3105cee9645SThomas Gleixner { 3115cee9645SThomas Gleixner struct k_itimer *timr; 3125cee9645SThomas Gleixner unsigned long flags; 3135cee9645SThomas Gleixner 3145cee9645SThomas Gleixner timr = lock_timer(info->si_tid, &flags); 315af888d67SThomas Gleixner if (!timr) 316af888d67SThomas Gleixner return; 3175cee9645SThomas Gleixner 318af888d67SThomas Gleixner if (timr->it_requeue_pending == info->si_sys_private) { 319f37fb0aaSThomas Gleixner timr->kclock->timer_rearm(timr); 3205cee9645SThomas Gleixner 32121e55c1fSThomas Gleixner timr->it_active = 1; 322af888d67SThomas Gleixner timr->it_overrun_last = timr->it_overrun; 323af888d67SThomas Gleixner timr->it_overrun = -1; 324af888d67SThomas Gleixner ++timr->it_requeue_pending; 325af888d67SThomas Gleixner 3265cee9645SThomas Gleixner info->si_overrun += timr->it_overrun_last; 3275cee9645SThomas Gleixner } 3285cee9645SThomas Gleixner 3295cee9645SThomas Gleixner unlock_timer(timr, flags); 3305cee9645SThomas Gleixner } 3315cee9645SThomas Gleixner 3325cee9645SThomas Gleixner int posix_timer_event(struct k_itimer *timr, int si_private) 3335cee9645SThomas Gleixner { 3345cee9645SThomas Gleixner struct task_struct *task; 3355cee9645SThomas Gleixner int shared, ret = -1; 3365cee9645SThomas Gleixner /* 3375cee9645SThomas Gleixner * FIXME: if ->sigq is queued we can race with 33896fe3b07SThomas Gleixner * dequeue_signal()->posixtimer_rearm(). 3395cee9645SThomas Gleixner * 3405cee9645SThomas Gleixner * If dequeue_signal() sees the "right" value of 34196fe3b07SThomas Gleixner * si_sys_private it calls posixtimer_rearm(). 3425cee9645SThomas Gleixner * We re-queue ->sigq and drop ->it_lock(). 34396fe3b07SThomas Gleixner * posixtimer_rearm() locks the timer 3445cee9645SThomas Gleixner * and re-schedules it while ->sigq is pending. 3455cee9645SThomas Gleixner * Not really bad, but not that we want. 3465cee9645SThomas Gleixner */ 3475cee9645SThomas Gleixner timr->sigq->info.si_sys_private = si_private; 3485cee9645SThomas Gleixner 3495cee9645SThomas Gleixner rcu_read_lock(); 3505cee9645SThomas Gleixner task = pid_task(timr->it_pid, PIDTYPE_PID); 3515cee9645SThomas Gleixner if (task) { 3525cee9645SThomas Gleixner shared = !(timr->it_sigev_notify & SIGEV_THREAD_ID); 3535cee9645SThomas Gleixner ret = send_sigqueue(timr->sigq, task, shared); 3545cee9645SThomas Gleixner } 3555cee9645SThomas Gleixner rcu_read_unlock(); 3565cee9645SThomas Gleixner /* If we failed to send the signal the timer stops. */ 3575cee9645SThomas Gleixner return ret > 0; 3585cee9645SThomas Gleixner } 3595cee9645SThomas Gleixner 3605cee9645SThomas Gleixner /* 3615cee9645SThomas Gleixner * This function gets called when a POSIX.1b interval timer expires. It 3625cee9645SThomas Gleixner * is used as a callback from the kernel internal timer. The 3635cee9645SThomas Gleixner * run_timer_list code ALWAYS calls with interrupts on. 3645cee9645SThomas Gleixner 3655cee9645SThomas Gleixner * This code is for CLOCK_REALTIME* and CLOCK_MONOTONIC* timers. 3665cee9645SThomas Gleixner */ 3675cee9645SThomas Gleixner static enum hrtimer_restart posix_timer_fn(struct hrtimer *timer) 3685cee9645SThomas Gleixner { 3695cee9645SThomas Gleixner struct k_itimer *timr; 3705cee9645SThomas Gleixner unsigned long flags; 3715cee9645SThomas Gleixner int si_private = 0; 3725cee9645SThomas Gleixner enum hrtimer_restart ret = HRTIMER_NORESTART; 3735cee9645SThomas Gleixner 3745cee9645SThomas Gleixner timr = container_of(timer, struct k_itimer, it.real.timer); 3755cee9645SThomas Gleixner spin_lock_irqsave(&timr->it_lock, flags); 3765cee9645SThomas Gleixner 37721e55c1fSThomas Gleixner timr->it_active = 0; 37880105cd0SThomas Gleixner if (timr->it_interval != 0) 3795cee9645SThomas Gleixner si_private = ++timr->it_requeue_pending; 3805cee9645SThomas Gleixner 3815cee9645SThomas Gleixner if (posix_timer_event(timr, si_private)) { 3825cee9645SThomas Gleixner /* 3835cee9645SThomas Gleixner * signal was not sent because of sig_ignor 3845cee9645SThomas Gleixner * we will not get a call back to restart it AND 3855cee9645SThomas Gleixner * it should be restarted. 3865cee9645SThomas Gleixner */ 38780105cd0SThomas Gleixner if (timr->it_interval != 0) { 3885cee9645SThomas Gleixner ktime_t now = hrtimer_cb_get_time(timer); 3895cee9645SThomas Gleixner 3905cee9645SThomas Gleixner /* 3915cee9645SThomas Gleixner * FIXME: What we really want, is to stop this 3925cee9645SThomas Gleixner * timer completely and restart it in case the 3935cee9645SThomas Gleixner * SIG_IGN is removed. This is a non trivial 3945cee9645SThomas Gleixner * change which involves sighand locking 3955cee9645SThomas Gleixner * (sigh !), which we don't want to do late in 3965cee9645SThomas Gleixner * the release cycle. 3975cee9645SThomas Gleixner * 3985cee9645SThomas Gleixner * For now we just let timers with an interval 3995cee9645SThomas Gleixner * less than a jiffie expire every jiffie to 4005cee9645SThomas Gleixner * avoid softirq starvation in case of SIG_IGN 4015cee9645SThomas Gleixner * and a very small interval, which would put 4025cee9645SThomas Gleixner * the timer right back on the softirq pending 4035cee9645SThomas Gleixner * list. By moving now ahead of time we trick 4045cee9645SThomas Gleixner * hrtimer_forward() to expire the timer 4055cee9645SThomas Gleixner * later, while we still maintain the overrun 4065cee9645SThomas Gleixner * accuracy, but have some inconsistency in 4075cee9645SThomas Gleixner * the timer_gettime() case. This is at least 4085cee9645SThomas Gleixner * better than a starved softirq. A more 4095cee9645SThomas Gleixner * complex fix which solves also another related 4105cee9645SThomas Gleixner * inconsistency is already in the pipeline. 4115cee9645SThomas Gleixner */ 4125cee9645SThomas Gleixner #ifdef CONFIG_HIGH_RES_TIMERS 4135cee9645SThomas Gleixner { 4148b0e1953SThomas Gleixner ktime_t kj = NSEC_PER_SEC / HZ; 4155cee9645SThomas Gleixner 41680105cd0SThomas Gleixner if (timr->it_interval < kj) 4175cee9645SThomas Gleixner now = ktime_add(now, kj); 4185cee9645SThomas Gleixner } 4195cee9645SThomas Gleixner #endif 4205cee9645SThomas Gleixner timr->it_overrun += (unsigned int) 4215cee9645SThomas Gleixner hrtimer_forward(timer, now, 42280105cd0SThomas Gleixner timr->it_interval); 4235cee9645SThomas Gleixner ret = HRTIMER_RESTART; 4245cee9645SThomas Gleixner ++timr->it_requeue_pending; 42521e55c1fSThomas Gleixner timr->it_active = 1; 4265cee9645SThomas Gleixner } 4275cee9645SThomas Gleixner } 4285cee9645SThomas Gleixner 4295cee9645SThomas Gleixner unlock_timer(timr, flags); 4305cee9645SThomas Gleixner return ret; 4315cee9645SThomas Gleixner } 4325cee9645SThomas Gleixner 4335cee9645SThomas Gleixner static struct pid *good_sigevent(sigevent_t * event) 4345cee9645SThomas Gleixner { 4355cee9645SThomas Gleixner struct task_struct *rtn = current->group_leader; 4365cee9645SThomas Gleixner 4375cee9645SThomas Gleixner if ((event->sigev_notify & SIGEV_THREAD_ID ) && 4385cee9645SThomas Gleixner (!(rtn = find_task_by_vpid(event->sigev_notify_thread_id)) || 4395cee9645SThomas Gleixner !same_thread_group(rtn, current) || 4405cee9645SThomas Gleixner (event->sigev_notify & ~SIGEV_THREAD_ID) != SIGEV_SIGNAL)) 4415cee9645SThomas Gleixner return NULL; 4425cee9645SThomas Gleixner 4435cee9645SThomas Gleixner if (((event->sigev_notify & ~SIGEV_THREAD_ID) != SIGEV_NONE) && 4445cee9645SThomas Gleixner ((event->sigev_signo <= 0) || (event->sigev_signo > SIGRTMAX))) 4455cee9645SThomas Gleixner return NULL; 4465cee9645SThomas Gleixner 4475cee9645SThomas Gleixner return task_pid(rtn); 4485cee9645SThomas Gleixner } 4495cee9645SThomas Gleixner 4505cee9645SThomas Gleixner static struct k_itimer * alloc_posix_timer(void) 4515cee9645SThomas Gleixner { 4525cee9645SThomas Gleixner struct k_itimer *tmr; 4535cee9645SThomas Gleixner tmr = kmem_cache_zalloc(posix_timers_cache, GFP_KERNEL); 4545cee9645SThomas Gleixner if (!tmr) 4555cee9645SThomas Gleixner return tmr; 4565cee9645SThomas Gleixner if (unlikely(!(tmr->sigq = sigqueue_alloc()))) { 4575cee9645SThomas Gleixner kmem_cache_free(posix_timers_cache, tmr); 4585cee9645SThomas Gleixner return NULL; 4595cee9645SThomas Gleixner } 4605cee9645SThomas Gleixner memset(&tmr->sigq->info, 0, sizeof(siginfo_t)); 4615cee9645SThomas Gleixner return tmr; 4625cee9645SThomas Gleixner } 4635cee9645SThomas Gleixner 4645cee9645SThomas Gleixner static void k_itimer_rcu_free(struct rcu_head *head) 4655cee9645SThomas Gleixner { 4665cee9645SThomas Gleixner struct k_itimer *tmr = container_of(head, struct k_itimer, it.rcu); 4675cee9645SThomas Gleixner 4685cee9645SThomas Gleixner kmem_cache_free(posix_timers_cache, tmr); 4695cee9645SThomas Gleixner } 4705cee9645SThomas Gleixner 4715cee9645SThomas Gleixner #define IT_ID_SET 1 4725cee9645SThomas Gleixner #define IT_ID_NOT_SET 0 4735cee9645SThomas Gleixner static void release_posix_timer(struct k_itimer *tmr, int it_id_set) 4745cee9645SThomas Gleixner { 4755cee9645SThomas Gleixner if (it_id_set) { 4765cee9645SThomas Gleixner unsigned long flags; 4775cee9645SThomas Gleixner spin_lock_irqsave(&hash_lock, flags); 4785cee9645SThomas Gleixner hlist_del_rcu(&tmr->t_hash); 4795cee9645SThomas Gleixner spin_unlock_irqrestore(&hash_lock, flags); 4805cee9645SThomas Gleixner } 4815cee9645SThomas Gleixner put_pid(tmr->it_pid); 4825cee9645SThomas Gleixner sigqueue_free(tmr->sigq); 4835cee9645SThomas Gleixner call_rcu(&tmr->it.rcu, k_itimer_rcu_free); 4845cee9645SThomas Gleixner } 4855cee9645SThomas Gleixner 4865cee9645SThomas Gleixner static int common_timer_create(struct k_itimer *new_timer) 4875cee9645SThomas Gleixner { 4885cee9645SThomas Gleixner hrtimer_init(&new_timer->it.real.timer, new_timer->it_clock, 0); 4895cee9645SThomas Gleixner return 0; 4905cee9645SThomas Gleixner } 4915cee9645SThomas Gleixner 4925cee9645SThomas Gleixner /* Create a POSIX.1b interval timer. */ 4932482097cSAl Viro static int do_timer_create(clockid_t which_clock, struct sigevent *event, 4942482097cSAl Viro timer_t __user *created_timer_id) 4955cee9645SThomas Gleixner { 496d3ba5a9aSChristoph Hellwig const struct k_clock *kc = clockid_to_kclock(which_clock); 4975cee9645SThomas Gleixner struct k_itimer *new_timer; 4985cee9645SThomas Gleixner int error, new_timer_id; 4995cee9645SThomas Gleixner int it_id_set = IT_ID_NOT_SET; 5005cee9645SThomas Gleixner 5015cee9645SThomas Gleixner if (!kc) 5025cee9645SThomas Gleixner return -EINVAL; 5035cee9645SThomas Gleixner if (!kc->timer_create) 5045cee9645SThomas Gleixner return -EOPNOTSUPP; 5055cee9645SThomas Gleixner 5065cee9645SThomas Gleixner new_timer = alloc_posix_timer(); 5075cee9645SThomas Gleixner if (unlikely(!new_timer)) 5085cee9645SThomas Gleixner return -EAGAIN; 5095cee9645SThomas Gleixner 5105cee9645SThomas Gleixner spin_lock_init(&new_timer->it_lock); 5115cee9645SThomas Gleixner new_timer_id = posix_timer_add(new_timer); 5125cee9645SThomas Gleixner if (new_timer_id < 0) { 5135cee9645SThomas Gleixner error = new_timer_id; 5145cee9645SThomas Gleixner goto out; 5155cee9645SThomas Gleixner } 5165cee9645SThomas Gleixner 5175cee9645SThomas Gleixner it_id_set = IT_ID_SET; 5185cee9645SThomas Gleixner new_timer->it_id = (timer_t) new_timer_id; 5195cee9645SThomas Gleixner new_timer->it_clock = which_clock; 520d97bb75dSThomas Gleixner new_timer->kclock = kc; 5215cee9645SThomas Gleixner new_timer->it_overrun = -1; 5225cee9645SThomas Gleixner 5232482097cSAl Viro if (event) { 5245cee9645SThomas Gleixner rcu_read_lock(); 5252482097cSAl Viro new_timer->it_pid = get_pid(good_sigevent(event)); 5265cee9645SThomas Gleixner rcu_read_unlock(); 5275cee9645SThomas Gleixner if (!new_timer->it_pid) { 5285cee9645SThomas Gleixner error = -EINVAL; 5295cee9645SThomas Gleixner goto out; 5305cee9645SThomas Gleixner } 5312482097cSAl Viro new_timer->it_sigev_notify = event->sigev_notify; 5322482097cSAl Viro new_timer->sigq->info.si_signo = event->sigev_signo; 5332482097cSAl Viro new_timer->sigq->info.si_value = event->sigev_value; 5345cee9645SThomas Gleixner } else { 5352482097cSAl Viro new_timer->it_sigev_notify = SIGEV_SIGNAL; 5362482097cSAl Viro new_timer->sigq->info.si_signo = SIGALRM; 5372482097cSAl Viro memset(&new_timer->sigq->info.si_value, 0, sizeof(sigval_t)); 5382482097cSAl Viro new_timer->sigq->info.si_value.sival_int = new_timer->it_id; 5395cee9645SThomas Gleixner new_timer->it_pid = get_pid(task_tgid(current)); 5405cee9645SThomas Gleixner } 5415cee9645SThomas Gleixner 5425cee9645SThomas Gleixner new_timer->sigq->info.si_tid = new_timer->it_id; 5435cee9645SThomas Gleixner new_timer->sigq->info.si_code = SI_TIMER; 5445cee9645SThomas Gleixner 5455cee9645SThomas Gleixner if (copy_to_user(created_timer_id, 5465cee9645SThomas Gleixner &new_timer_id, sizeof (new_timer_id))) { 5475cee9645SThomas Gleixner error = -EFAULT; 5485cee9645SThomas Gleixner goto out; 5495cee9645SThomas Gleixner } 5505cee9645SThomas Gleixner 5515cee9645SThomas Gleixner error = kc->timer_create(new_timer); 5525cee9645SThomas Gleixner if (error) 5535cee9645SThomas Gleixner goto out; 5545cee9645SThomas Gleixner 5555cee9645SThomas Gleixner spin_lock_irq(¤t->sighand->siglock); 5565cee9645SThomas Gleixner new_timer->it_signal = current->signal; 5575cee9645SThomas Gleixner list_add(&new_timer->list, ¤t->signal->posix_timers); 5585cee9645SThomas Gleixner spin_unlock_irq(¤t->sighand->siglock); 5595cee9645SThomas Gleixner 5605cee9645SThomas Gleixner return 0; 5615cee9645SThomas Gleixner /* 5625cee9645SThomas Gleixner * In the case of the timer belonging to another task, after 5635cee9645SThomas Gleixner * the task is unlocked, the timer is owned by the other task 5645cee9645SThomas Gleixner * and may cease to exist at any time. Don't use or modify 5655cee9645SThomas Gleixner * new_timer after the unlock call. 5665cee9645SThomas Gleixner */ 5675cee9645SThomas Gleixner out: 5685cee9645SThomas Gleixner release_posix_timer(new_timer, it_id_set); 5695cee9645SThomas Gleixner return error; 5705cee9645SThomas Gleixner } 5715cee9645SThomas Gleixner 5722482097cSAl Viro SYSCALL_DEFINE3(timer_create, const clockid_t, which_clock, 5732482097cSAl Viro struct sigevent __user *, timer_event_spec, 5742482097cSAl Viro timer_t __user *, created_timer_id) 5752482097cSAl Viro { 5762482097cSAl Viro if (timer_event_spec) { 5772482097cSAl Viro sigevent_t event; 5782482097cSAl Viro 5792482097cSAl Viro if (copy_from_user(&event, timer_event_spec, sizeof (event))) 5802482097cSAl Viro return -EFAULT; 5812482097cSAl Viro return do_timer_create(which_clock, &event, created_timer_id); 5822482097cSAl Viro } 5832482097cSAl Viro return do_timer_create(which_clock, NULL, created_timer_id); 5842482097cSAl Viro } 5852482097cSAl Viro 5862482097cSAl Viro #ifdef CONFIG_COMPAT 5872482097cSAl Viro COMPAT_SYSCALL_DEFINE3(timer_create, clockid_t, which_clock, 5882482097cSAl Viro struct compat_sigevent __user *, timer_event_spec, 5892482097cSAl Viro timer_t __user *, created_timer_id) 5902482097cSAl Viro { 5912482097cSAl Viro if (timer_event_spec) { 5922482097cSAl Viro sigevent_t event; 5932482097cSAl Viro 5942482097cSAl Viro if (get_compat_sigevent(&event, timer_event_spec)) 5952482097cSAl Viro return -EFAULT; 5962482097cSAl Viro return do_timer_create(which_clock, &event, created_timer_id); 5972482097cSAl Viro } 5982482097cSAl Viro return do_timer_create(which_clock, NULL, created_timer_id); 5992482097cSAl Viro } 6002482097cSAl Viro #endif 6012482097cSAl Viro 6025cee9645SThomas Gleixner /* 6035cee9645SThomas Gleixner * Locking issues: We need to protect the result of the id look up until 6045cee9645SThomas Gleixner * we get the timer locked down so it is not deleted under us. The 6055cee9645SThomas Gleixner * removal is done under the idr spinlock so we use that here to bridge 6065cee9645SThomas Gleixner * the find to the timer lock. To avoid a dead lock, the timer id MUST 6075cee9645SThomas Gleixner * be release with out holding the timer lock. 6085cee9645SThomas Gleixner */ 6095cee9645SThomas Gleixner static struct k_itimer *__lock_timer(timer_t timer_id, unsigned long *flags) 6105cee9645SThomas Gleixner { 6115cee9645SThomas Gleixner struct k_itimer *timr; 6125cee9645SThomas Gleixner 6135cee9645SThomas Gleixner /* 6145cee9645SThomas Gleixner * timer_t could be any type >= int and we want to make sure any 6155cee9645SThomas Gleixner * @timer_id outside positive int range fails lookup. 6165cee9645SThomas Gleixner */ 6175cee9645SThomas Gleixner if ((unsigned long long)timer_id > INT_MAX) 6185cee9645SThomas Gleixner return NULL; 6195cee9645SThomas Gleixner 6205cee9645SThomas Gleixner rcu_read_lock(); 6215cee9645SThomas Gleixner timr = posix_timer_by_id(timer_id); 6225cee9645SThomas Gleixner if (timr) { 6235cee9645SThomas Gleixner spin_lock_irqsave(&timr->it_lock, *flags); 6245cee9645SThomas Gleixner if (timr->it_signal == current->signal) { 6255cee9645SThomas Gleixner rcu_read_unlock(); 6265cee9645SThomas Gleixner return timr; 6275cee9645SThomas Gleixner } 6285cee9645SThomas Gleixner spin_unlock_irqrestore(&timr->it_lock, *flags); 6295cee9645SThomas Gleixner } 6305cee9645SThomas Gleixner rcu_read_unlock(); 6315cee9645SThomas Gleixner 6325cee9645SThomas Gleixner return NULL; 6335cee9645SThomas Gleixner } 6345cee9645SThomas Gleixner 63591d57baeSThomas Gleixner static ktime_t common_hrtimer_remaining(struct k_itimer *timr, ktime_t now) 63691d57baeSThomas Gleixner { 63791d57baeSThomas Gleixner struct hrtimer *timer = &timr->it.real.timer; 63891d57baeSThomas Gleixner 63991d57baeSThomas Gleixner return __hrtimer_expires_remaining_adjusted(timer, now); 64091d57baeSThomas Gleixner } 64191d57baeSThomas Gleixner 64291d57baeSThomas Gleixner static int common_hrtimer_forward(struct k_itimer *timr, ktime_t now) 64391d57baeSThomas Gleixner { 64491d57baeSThomas Gleixner struct hrtimer *timer = &timr->it.real.timer; 64591d57baeSThomas Gleixner 64691d57baeSThomas Gleixner return (int)hrtimer_forward(timer, now, timr->it_interval); 64791d57baeSThomas Gleixner } 64891d57baeSThomas Gleixner 6495cee9645SThomas Gleixner /* 6505cee9645SThomas Gleixner * Get the time remaining on a POSIX.1b interval timer. This function 6515cee9645SThomas Gleixner * is ALWAYS called with spin_lock_irq on the timer, thus it must not 6525cee9645SThomas Gleixner * mess with irq. 6535cee9645SThomas Gleixner * 6545cee9645SThomas Gleixner * We have a couple of messes to clean up here. First there is the case 6555cee9645SThomas Gleixner * of a timer that has a requeue pending. These timers should appear to 6565cee9645SThomas Gleixner * be in the timer list with an expiry as if we were to requeue them 6575cee9645SThomas Gleixner * now. 6585cee9645SThomas Gleixner * 6595cee9645SThomas Gleixner * The second issue is the SIGEV_NONE timer which may be active but is 6605cee9645SThomas Gleixner * not really ever put in the timer list (to save system resources). 6615cee9645SThomas Gleixner * This timer may be expired, and if so, we will do it here. Otherwise 6625cee9645SThomas Gleixner * it is the same as a requeue pending timer WRT to what we should 6635cee9645SThomas Gleixner * report. 6645cee9645SThomas Gleixner */ 665f2c45807SThomas Gleixner void common_timer_get(struct k_itimer *timr, struct itimerspec64 *cur_setting) 6665cee9645SThomas Gleixner { 66791d57baeSThomas Gleixner const struct k_clock *kc = timr->kclock; 6685cee9645SThomas Gleixner ktime_t now, remaining, iv; 66991d57baeSThomas Gleixner struct timespec64 ts64; 67091d57baeSThomas Gleixner bool sig_none; 6715cee9645SThomas Gleixner 672c6503be5SThomas Gleixner sig_none = (timr->it_sigev_notify & ~SIGEV_THREAD_ID) == SIGEV_NONE; 67380105cd0SThomas Gleixner iv = timr->it_interval; 6745cee9645SThomas Gleixner 6755cee9645SThomas Gleixner /* interval timer ? */ 67691d57baeSThomas Gleixner if (iv) { 6775f252b32SDeepa Dinamani cur_setting->it_interval = ktime_to_timespec64(iv); 67891d57baeSThomas Gleixner } else if (!timr->it_active) { 67991d57baeSThomas Gleixner /* 68091d57baeSThomas Gleixner * SIGEV_NONE oneshot timers are never queued. Check them 68191d57baeSThomas Gleixner * below. 68291d57baeSThomas Gleixner */ 68391d57baeSThomas Gleixner if (!sig_none) 6845cee9645SThomas Gleixner return; 68591d57baeSThomas Gleixner } 6865cee9645SThomas Gleixner 6875cee9645SThomas Gleixner /* 68891d57baeSThomas Gleixner * The timespec64 based conversion is suboptimal, but it's not 68991d57baeSThomas Gleixner * worth to implement yet another callback. 6905cee9645SThomas Gleixner */ 69191d57baeSThomas Gleixner kc->clock_get(timr->it_clock, &ts64); 69291d57baeSThomas Gleixner now = timespec64_to_ktime(ts64); 6935cee9645SThomas Gleixner 69491d57baeSThomas Gleixner /* 69591d57baeSThomas Gleixner * When a requeue is pending or this is a SIGEV_NONE timer move the 69691d57baeSThomas Gleixner * expiry time forward by intervals, so expiry is > now. 69791d57baeSThomas Gleixner */ 69891d57baeSThomas Gleixner if (iv && (timr->it_requeue_pending & REQUEUE_PENDING || sig_none)) 69991d57baeSThomas Gleixner timr->it_overrun += kc->timer_forward(timr, now); 70091d57baeSThomas Gleixner 70191d57baeSThomas Gleixner remaining = kc->timer_remaining(timr, now); 7025cee9645SThomas Gleixner /* Return 0 only, when the timer is expired and not pending */ 7032456e855SThomas Gleixner if (remaining <= 0) { 7045cee9645SThomas Gleixner /* 7055cee9645SThomas Gleixner * A single shot SIGEV_NONE timer must return 0, when 7065cee9645SThomas Gleixner * it is expired ! 7075cee9645SThomas Gleixner */ 70891d57baeSThomas Gleixner if (!sig_none) 7095cee9645SThomas Gleixner cur_setting->it_value.tv_nsec = 1; 71091d57baeSThomas Gleixner } else { 7115f252b32SDeepa Dinamani cur_setting->it_value = ktime_to_timespec64(remaining); 7125cee9645SThomas Gleixner } 71391d57baeSThomas Gleixner } 7145cee9645SThomas Gleixner 7155cee9645SThomas Gleixner /* Get the time remaining on a POSIX.1b interval timer. */ 716b0dc1242SAl Viro static int do_timer_gettime(timer_t timer_id, struct itimerspec64 *setting) 7175cee9645SThomas Gleixner { 7185cee9645SThomas Gleixner struct k_itimer *timr; 719d3ba5a9aSChristoph Hellwig const struct k_clock *kc; 7205cee9645SThomas Gleixner unsigned long flags; 7215cee9645SThomas Gleixner int ret = 0; 7225cee9645SThomas Gleixner 7235cee9645SThomas Gleixner timr = lock_timer(timer_id, &flags); 7245cee9645SThomas Gleixner if (!timr) 7255cee9645SThomas Gleixner return -EINVAL; 7265cee9645SThomas Gleixner 727b0dc1242SAl Viro memset(setting, 0, sizeof(*setting)); 728d97bb75dSThomas Gleixner kc = timr->kclock; 7295cee9645SThomas Gleixner if (WARN_ON_ONCE(!kc || !kc->timer_get)) 7305cee9645SThomas Gleixner ret = -EINVAL; 7315cee9645SThomas Gleixner else 732b0dc1242SAl Viro kc->timer_get(timr, setting); 7335cee9645SThomas Gleixner 7345cee9645SThomas Gleixner unlock_timer(timr, flags); 7355cee9645SThomas Gleixner return ret; 7365cee9645SThomas Gleixner } 7375cee9645SThomas Gleixner 738b0dc1242SAl Viro /* Get the time remaining on a POSIX.1b interval timer. */ 739b0dc1242SAl Viro SYSCALL_DEFINE2(timer_gettime, timer_t, timer_id, 740b0dc1242SAl Viro struct itimerspec __user *, setting) 741b0dc1242SAl Viro { 742b0dc1242SAl Viro struct itimerspec64 cur_setting64; 743b0dc1242SAl Viro 744b0dc1242SAl Viro int ret = do_timer_gettime(timer_id, &cur_setting64); 745b0dc1242SAl Viro if (!ret) { 746b0dc1242SAl Viro struct itimerspec cur_setting; 747b0dc1242SAl Viro cur_setting = itimerspec64_to_itimerspec(&cur_setting64); 748b0dc1242SAl Viro if (copy_to_user(setting, &cur_setting, sizeof (cur_setting))) 749b0dc1242SAl Viro ret = -EFAULT; 750b0dc1242SAl Viro } 751b0dc1242SAl Viro return ret; 752b0dc1242SAl Viro } 753b0dc1242SAl Viro 754b0dc1242SAl Viro #ifdef CONFIG_COMPAT 755b0dc1242SAl Viro COMPAT_SYSCALL_DEFINE2(timer_gettime, timer_t, timer_id, 756b0dc1242SAl Viro struct compat_itimerspec __user *, setting) 757b0dc1242SAl Viro { 758b0dc1242SAl Viro struct itimerspec64 cur_setting64; 759b0dc1242SAl Viro 760b0dc1242SAl Viro int ret = do_timer_gettime(timer_id, &cur_setting64); 761b0dc1242SAl Viro if (!ret) { 762b0dc1242SAl Viro struct itimerspec cur_setting; 763b0dc1242SAl Viro cur_setting = itimerspec64_to_itimerspec(&cur_setting64); 764b0dc1242SAl Viro if (put_compat_itimerspec(setting, &cur_setting)) 765b0dc1242SAl Viro ret = -EFAULT; 766b0dc1242SAl Viro } 767b0dc1242SAl Viro return ret; 768b0dc1242SAl Viro } 769b0dc1242SAl Viro #endif 770b0dc1242SAl Viro 7715cee9645SThomas Gleixner /* 7725cee9645SThomas Gleixner * Get the number of overruns of a POSIX.1b interval timer. This is to 7735cee9645SThomas Gleixner * be the overrun of the timer last delivered. At the same time we are 7745cee9645SThomas Gleixner * accumulating overruns on the next timer. The overrun is frozen when 7755cee9645SThomas Gleixner * the signal is delivered, either at the notify time (if the info block 7765cee9645SThomas Gleixner * is not queued) or at the actual delivery time (as we are informed by 77796fe3b07SThomas Gleixner * the call back to posixtimer_rearm(). So all we need to do is 7785cee9645SThomas Gleixner * to pick up the frozen overrun. 7795cee9645SThomas Gleixner */ 7805cee9645SThomas Gleixner SYSCALL_DEFINE1(timer_getoverrun, timer_t, timer_id) 7815cee9645SThomas Gleixner { 7825cee9645SThomas Gleixner struct k_itimer *timr; 7835cee9645SThomas Gleixner int overrun; 7845cee9645SThomas Gleixner unsigned long flags; 7855cee9645SThomas Gleixner 7865cee9645SThomas Gleixner timr = lock_timer(timer_id, &flags); 7875cee9645SThomas Gleixner if (!timr) 7885cee9645SThomas Gleixner return -EINVAL; 7895cee9645SThomas Gleixner 7905cee9645SThomas Gleixner overrun = timr->it_overrun_last; 7915cee9645SThomas Gleixner unlock_timer(timr, flags); 7925cee9645SThomas Gleixner 7935cee9645SThomas Gleixner return overrun; 7945cee9645SThomas Gleixner } 7955cee9645SThomas Gleixner 796eae1c4aeSThomas Gleixner static void common_hrtimer_arm(struct k_itimer *timr, ktime_t expires, 797eae1c4aeSThomas Gleixner bool absolute, bool sigev_none) 7985cee9645SThomas Gleixner { 7995cee9645SThomas Gleixner struct hrtimer *timer = &timr->it.real.timer; 8005cee9645SThomas Gleixner enum hrtimer_mode mode; 8015cee9645SThomas Gleixner 802eae1c4aeSThomas Gleixner mode = absolute ? HRTIMER_MODE_ABS : HRTIMER_MODE_REL; 80367edab48SThomas Gleixner /* 80467edab48SThomas Gleixner * Posix magic: Relative CLOCK_REALTIME timers are not affected by 80567edab48SThomas Gleixner * clock modifications, so they become CLOCK_MONOTONIC based under the 80667edab48SThomas Gleixner * hood. See hrtimer_init(). Update timr->kclock, so the generic 80767edab48SThomas Gleixner * functions which use timr->kclock->clock_get() work. 80867edab48SThomas Gleixner * 80967edab48SThomas Gleixner * Note: it_clock stays unmodified, because the next timer_set() might 81067edab48SThomas Gleixner * use ABSTIME, so it needs to switch back. 81167edab48SThomas Gleixner */ 81267edab48SThomas Gleixner if (timr->it_clock == CLOCK_REALTIME) 81367edab48SThomas Gleixner timr->kclock = absolute ? &clock_realtime : &clock_monotonic; 81467edab48SThomas Gleixner 815eae1c4aeSThomas Gleixner hrtimer_init(&timr->it.real.timer, timr->it_clock, mode); 816eae1c4aeSThomas Gleixner timr->it.real.timer.function = posix_timer_fn; 817eae1c4aeSThomas Gleixner 818eae1c4aeSThomas Gleixner if (!absolute) 819eae1c4aeSThomas Gleixner expires = ktime_add_safe(expires, timer->base->get_time()); 820eae1c4aeSThomas Gleixner hrtimer_set_expires(timer, expires); 821eae1c4aeSThomas Gleixner 822eae1c4aeSThomas Gleixner if (!sigev_none) 823eae1c4aeSThomas Gleixner hrtimer_start_expires(timer, HRTIMER_MODE_ABS); 824eae1c4aeSThomas Gleixner } 825eae1c4aeSThomas Gleixner 826eae1c4aeSThomas Gleixner static int common_hrtimer_try_to_cancel(struct k_itimer *timr) 827eae1c4aeSThomas Gleixner { 828eae1c4aeSThomas Gleixner return hrtimer_try_to_cancel(&timr->it.real.timer); 829eae1c4aeSThomas Gleixner } 830eae1c4aeSThomas Gleixner 831eae1c4aeSThomas Gleixner /* Set a POSIX.1b interval timer. */ 832f2c45807SThomas Gleixner int common_timer_set(struct k_itimer *timr, int flags, 833eae1c4aeSThomas Gleixner struct itimerspec64 *new_setting, 834eae1c4aeSThomas Gleixner struct itimerspec64 *old_setting) 835eae1c4aeSThomas Gleixner { 836eae1c4aeSThomas Gleixner const struct k_clock *kc = timr->kclock; 837eae1c4aeSThomas Gleixner bool sigev_none; 838eae1c4aeSThomas Gleixner ktime_t expires; 839eae1c4aeSThomas Gleixner 8405cee9645SThomas Gleixner if (old_setting) 8415cee9645SThomas Gleixner common_timer_get(timr, old_setting); 8425cee9645SThomas Gleixner 843eae1c4aeSThomas Gleixner /* Prevent rearming by clearing the interval */ 84480105cd0SThomas Gleixner timr->it_interval = 0; 8455cee9645SThomas Gleixner /* 846eae1c4aeSThomas Gleixner * Careful here. On SMP systems the timer expiry function could be 847eae1c4aeSThomas Gleixner * active and spinning on timr->it_lock. 8485cee9645SThomas Gleixner */ 849eae1c4aeSThomas Gleixner if (kc->timer_try_to_cancel(timr) < 0) 8505cee9645SThomas Gleixner return TIMER_RETRY; 8515cee9645SThomas Gleixner 85221e55c1fSThomas Gleixner timr->it_active = 0; 8535cee9645SThomas Gleixner timr->it_requeue_pending = (timr->it_requeue_pending + 2) & 8545cee9645SThomas Gleixner ~REQUEUE_PENDING; 8555cee9645SThomas Gleixner timr->it_overrun_last = 0; 8565cee9645SThomas Gleixner 857eae1c4aeSThomas Gleixner /* Switch off the timer when it_value is zero */ 8585cee9645SThomas Gleixner if (!new_setting->it_value.tv_sec && !new_setting->it_value.tv_nsec) 8595cee9645SThomas Gleixner return 0; 8605cee9645SThomas Gleixner 86180105cd0SThomas Gleixner timr->it_interval = timespec64_to_ktime(new_setting->it_interval); 862eae1c4aeSThomas Gleixner expires = timespec64_to_ktime(new_setting->it_value); 863eae1c4aeSThomas Gleixner sigev_none = (timr->it_sigev_notify & ~SIGEV_THREAD_ID) == SIGEV_NONE; 8645cee9645SThomas Gleixner 865eae1c4aeSThomas Gleixner kc->timer_arm(timr, expires, flags & TIMER_ABSTIME, sigev_none); 866eae1c4aeSThomas Gleixner timr->it_active = !sigev_none; 8675cee9645SThomas Gleixner return 0; 8685cee9645SThomas Gleixner } 8695cee9645SThomas Gleixner 8701acbe770SAl Viro static int do_timer_settime(timer_t timer_id, int flags, 8711acbe770SAl Viro struct itimerspec64 *new_spec64, 8721acbe770SAl Viro struct itimerspec64 *old_spec64) 8735cee9645SThomas Gleixner { 8741acbe770SAl Viro const struct k_clock *kc; 8755f252b32SDeepa Dinamani struct k_itimer *timr; 8765cee9645SThomas Gleixner unsigned long flag; 8775f252b32SDeepa Dinamani int error = 0; 8785cee9645SThomas Gleixner 8791acbe770SAl Viro if (!timespec64_valid(&new_spec64->it_interval) || 8801acbe770SAl Viro !timespec64_valid(&new_spec64->it_value)) 8815cee9645SThomas Gleixner return -EINVAL; 8825cee9645SThomas Gleixner 8831acbe770SAl Viro if (old_spec64) 8841acbe770SAl Viro memset(old_spec64, 0, sizeof(*old_spec64)); 8855cee9645SThomas Gleixner retry: 8865cee9645SThomas Gleixner timr = lock_timer(timer_id, &flag); 8875cee9645SThomas Gleixner if (!timr) 8885cee9645SThomas Gleixner return -EINVAL; 8895cee9645SThomas Gleixner 890d97bb75dSThomas Gleixner kc = timr->kclock; 8915cee9645SThomas Gleixner if (WARN_ON_ONCE(!kc || !kc->timer_set)) 8925cee9645SThomas Gleixner error = -EINVAL; 8935cee9645SThomas Gleixner else 8941acbe770SAl Viro error = kc->timer_set(timr, flags, new_spec64, old_spec64); 8955cee9645SThomas Gleixner 8965cee9645SThomas Gleixner unlock_timer(timr, flag); 8975cee9645SThomas Gleixner if (error == TIMER_RETRY) { 8981acbe770SAl Viro old_spec64 = NULL; // We already got the old time... 8995cee9645SThomas Gleixner goto retry; 9005cee9645SThomas Gleixner } 9015cee9645SThomas Gleixner 9025cee9645SThomas Gleixner return error; 9035cee9645SThomas Gleixner } 9045cee9645SThomas Gleixner 9051acbe770SAl Viro /* Set a POSIX.1b interval timer */ 9061acbe770SAl Viro SYSCALL_DEFINE4(timer_settime, timer_t, timer_id, int, flags, 9071acbe770SAl Viro const struct itimerspec __user *, new_setting, 9081acbe770SAl Viro struct itimerspec __user *, old_setting) 9091acbe770SAl Viro { 9101acbe770SAl Viro struct itimerspec64 new_spec64, old_spec64; 9111acbe770SAl Viro struct itimerspec64 *rtn = old_setting ? &old_spec64 : NULL; 9121acbe770SAl Viro struct itimerspec new_spec; 9131acbe770SAl Viro int error = 0; 9141acbe770SAl Viro 9151acbe770SAl Viro if (!new_setting) 9161acbe770SAl Viro return -EINVAL; 9171acbe770SAl Viro 9181acbe770SAl Viro if (copy_from_user(&new_spec, new_setting, sizeof (new_spec))) 9191acbe770SAl Viro return -EFAULT; 9201acbe770SAl Viro new_spec64 = itimerspec_to_itimerspec64(&new_spec); 9211acbe770SAl Viro 9221acbe770SAl Viro error = do_timer_settime(timer_id, flags, &new_spec64, rtn); 9231acbe770SAl Viro if (!error && old_setting) { 9241acbe770SAl Viro struct itimerspec old_spec; 9251acbe770SAl Viro old_spec = itimerspec64_to_itimerspec(&old_spec64); 9261acbe770SAl Viro if (copy_to_user(old_setting, &old_spec, sizeof (old_spec))) 9271acbe770SAl Viro error = -EFAULT; 9281acbe770SAl Viro } 9291acbe770SAl Viro return error; 9301acbe770SAl Viro } 9311acbe770SAl Viro 9321acbe770SAl Viro #ifdef CONFIG_COMPAT 9331acbe770SAl Viro COMPAT_SYSCALL_DEFINE4(timer_settime, timer_t, timer_id, int, flags, 9341acbe770SAl Viro struct compat_itimerspec __user *, new, 9351acbe770SAl Viro struct compat_itimerspec __user *, old) 9361acbe770SAl Viro { 9371acbe770SAl Viro struct itimerspec64 new_spec64, old_spec64; 9381acbe770SAl Viro struct itimerspec64 *rtn = old ? &old_spec64 : NULL; 9391acbe770SAl Viro struct itimerspec new_spec; 9401acbe770SAl Viro int error = 0; 9411acbe770SAl Viro 9421acbe770SAl Viro if (!new) 9431acbe770SAl Viro return -EINVAL; 9441acbe770SAl Viro if (get_compat_itimerspec(&new_spec, new)) 9451acbe770SAl Viro return -EFAULT; 9461acbe770SAl Viro 9471acbe770SAl Viro new_spec64 = itimerspec_to_itimerspec64(&new_spec); 9481acbe770SAl Viro error = do_timer_settime(timer_id, flags, &new_spec64, rtn); 9491acbe770SAl Viro if (!error && old) { 9501acbe770SAl Viro struct itimerspec old_spec; 9511acbe770SAl Viro old_spec = itimerspec64_to_itimerspec(&old_spec64); 9521acbe770SAl Viro if (put_compat_itimerspec(old, &old_spec)) 9531acbe770SAl Viro error = -EFAULT; 9541acbe770SAl Viro } 9551acbe770SAl Viro return error; 9561acbe770SAl Viro } 9571acbe770SAl Viro #endif 9581acbe770SAl Viro 959f2c45807SThomas Gleixner int common_timer_del(struct k_itimer *timer) 9605cee9645SThomas Gleixner { 961eae1c4aeSThomas Gleixner const struct k_clock *kc = timer->kclock; 9625cee9645SThomas Gleixner 963eae1c4aeSThomas Gleixner timer->it_interval = 0; 964eae1c4aeSThomas Gleixner if (kc->timer_try_to_cancel(timer) < 0) 9655cee9645SThomas Gleixner return TIMER_RETRY; 96621e55c1fSThomas Gleixner timer->it_active = 0; 9675cee9645SThomas Gleixner return 0; 9685cee9645SThomas Gleixner } 9695cee9645SThomas Gleixner 9705cee9645SThomas Gleixner static inline int timer_delete_hook(struct k_itimer *timer) 9715cee9645SThomas Gleixner { 972d97bb75dSThomas Gleixner const struct k_clock *kc = timer->kclock; 9735cee9645SThomas Gleixner 9745cee9645SThomas Gleixner if (WARN_ON_ONCE(!kc || !kc->timer_del)) 9755cee9645SThomas Gleixner return -EINVAL; 9765cee9645SThomas Gleixner return kc->timer_del(timer); 9775cee9645SThomas Gleixner } 9785cee9645SThomas Gleixner 9795cee9645SThomas Gleixner /* Delete a POSIX.1b interval timer. */ 9805cee9645SThomas Gleixner SYSCALL_DEFINE1(timer_delete, timer_t, timer_id) 9815cee9645SThomas Gleixner { 9825cee9645SThomas Gleixner struct k_itimer *timer; 9835cee9645SThomas Gleixner unsigned long flags; 9845cee9645SThomas Gleixner 9855cee9645SThomas Gleixner retry_delete: 9865cee9645SThomas Gleixner timer = lock_timer(timer_id, &flags); 9875cee9645SThomas Gleixner if (!timer) 9885cee9645SThomas Gleixner return -EINVAL; 9895cee9645SThomas Gleixner 9905cee9645SThomas Gleixner if (timer_delete_hook(timer) == TIMER_RETRY) { 9915cee9645SThomas Gleixner unlock_timer(timer, flags); 9925cee9645SThomas Gleixner goto retry_delete; 9935cee9645SThomas Gleixner } 9945cee9645SThomas Gleixner 9955cee9645SThomas Gleixner spin_lock(¤t->sighand->siglock); 9965cee9645SThomas Gleixner list_del(&timer->list); 9975cee9645SThomas Gleixner spin_unlock(¤t->sighand->siglock); 9985cee9645SThomas Gleixner /* 9995cee9645SThomas Gleixner * This keeps any tasks waiting on the spin lock from thinking 10005cee9645SThomas Gleixner * they got something (see the lock code above). 10015cee9645SThomas Gleixner */ 10025cee9645SThomas Gleixner timer->it_signal = NULL; 10035cee9645SThomas Gleixner 10045cee9645SThomas Gleixner unlock_timer(timer, flags); 10055cee9645SThomas Gleixner release_posix_timer(timer, IT_ID_SET); 10065cee9645SThomas Gleixner return 0; 10075cee9645SThomas Gleixner } 10085cee9645SThomas Gleixner 10095cee9645SThomas Gleixner /* 10105cee9645SThomas Gleixner * return timer owned by the process, used by exit_itimers 10115cee9645SThomas Gleixner */ 10125cee9645SThomas Gleixner static void itimer_delete(struct k_itimer *timer) 10135cee9645SThomas Gleixner { 10145cee9645SThomas Gleixner unsigned long flags; 10155cee9645SThomas Gleixner 10165cee9645SThomas Gleixner retry_delete: 10175cee9645SThomas Gleixner spin_lock_irqsave(&timer->it_lock, flags); 10185cee9645SThomas Gleixner 10195cee9645SThomas Gleixner if (timer_delete_hook(timer) == TIMER_RETRY) { 10205cee9645SThomas Gleixner unlock_timer(timer, flags); 10215cee9645SThomas Gleixner goto retry_delete; 10225cee9645SThomas Gleixner } 10235cee9645SThomas Gleixner list_del(&timer->list); 10245cee9645SThomas Gleixner /* 10255cee9645SThomas Gleixner * This keeps any tasks waiting on the spin lock from thinking 10265cee9645SThomas Gleixner * they got something (see the lock code above). 10275cee9645SThomas Gleixner */ 10285cee9645SThomas Gleixner timer->it_signal = NULL; 10295cee9645SThomas Gleixner 10305cee9645SThomas Gleixner unlock_timer(timer, flags); 10315cee9645SThomas Gleixner release_posix_timer(timer, IT_ID_SET); 10325cee9645SThomas Gleixner } 10335cee9645SThomas Gleixner 10345cee9645SThomas Gleixner /* 10355cee9645SThomas Gleixner * This is called by do_exit or de_thread, only when there are no more 10365cee9645SThomas Gleixner * references to the shared signal_struct. 10375cee9645SThomas Gleixner */ 10385cee9645SThomas Gleixner void exit_itimers(struct signal_struct *sig) 10395cee9645SThomas Gleixner { 10405cee9645SThomas Gleixner struct k_itimer *tmr; 10415cee9645SThomas Gleixner 10425cee9645SThomas Gleixner while (!list_empty(&sig->posix_timers)) { 10435cee9645SThomas Gleixner tmr = list_entry(sig->posix_timers.next, struct k_itimer, list); 10445cee9645SThomas Gleixner itimer_delete(tmr); 10455cee9645SThomas Gleixner } 10465cee9645SThomas Gleixner } 10475cee9645SThomas Gleixner 10485cee9645SThomas Gleixner SYSCALL_DEFINE2(clock_settime, const clockid_t, which_clock, 10495cee9645SThomas Gleixner const struct timespec __user *, tp) 10505cee9645SThomas Gleixner { 1051d3ba5a9aSChristoph Hellwig const struct k_clock *kc = clockid_to_kclock(which_clock); 10525c499410SDeepa Dinamani struct timespec64 new_tp; 10535cee9645SThomas Gleixner 10545cee9645SThomas Gleixner if (!kc || !kc->clock_set) 10555cee9645SThomas Gleixner return -EINVAL; 10565cee9645SThomas Gleixner 10575c499410SDeepa Dinamani if (get_timespec64(&new_tp, tp)) 10585cee9645SThomas Gleixner return -EFAULT; 10595cee9645SThomas Gleixner 10605c499410SDeepa Dinamani return kc->clock_set(which_clock, &new_tp); 10615cee9645SThomas Gleixner } 10625cee9645SThomas Gleixner 10635cee9645SThomas Gleixner SYSCALL_DEFINE2(clock_gettime, const clockid_t, which_clock, 10645cee9645SThomas Gleixner struct timespec __user *,tp) 10655cee9645SThomas Gleixner { 1066d3ba5a9aSChristoph Hellwig const struct k_clock *kc = clockid_to_kclock(which_clock); 10675c499410SDeepa Dinamani struct timespec64 kernel_tp; 10685cee9645SThomas Gleixner int error; 10695cee9645SThomas Gleixner 10705cee9645SThomas Gleixner if (!kc) 10715cee9645SThomas Gleixner return -EINVAL; 10725cee9645SThomas Gleixner 10735c499410SDeepa Dinamani error = kc->clock_get(which_clock, &kernel_tp); 10745cee9645SThomas Gleixner 10755c499410SDeepa Dinamani if (!error && put_timespec64(&kernel_tp, tp)) 10765cee9645SThomas Gleixner error = -EFAULT; 10775cee9645SThomas Gleixner 10785cee9645SThomas Gleixner return error; 10795cee9645SThomas Gleixner } 10805cee9645SThomas Gleixner 10815cee9645SThomas Gleixner SYSCALL_DEFINE2(clock_adjtime, const clockid_t, which_clock, 10825cee9645SThomas Gleixner struct timex __user *, utx) 10835cee9645SThomas Gleixner { 1084d3ba5a9aSChristoph Hellwig const struct k_clock *kc = clockid_to_kclock(which_clock); 10855cee9645SThomas Gleixner struct timex ktx; 10865cee9645SThomas Gleixner int err; 10875cee9645SThomas Gleixner 10885cee9645SThomas Gleixner if (!kc) 10895cee9645SThomas Gleixner return -EINVAL; 10905cee9645SThomas Gleixner if (!kc->clock_adj) 10915cee9645SThomas Gleixner return -EOPNOTSUPP; 10925cee9645SThomas Gleixner 10935cee9645SThomas Gleixner if (copy_from_user(&ktx, utx, sizeof(ktx))) 10945cee9645SThomas Gleixner return -EFAULT; 10955cee9645SThomas Gleixner 10965cee9645SThomas Gleixner err = kc->clock_adj(which_clock, &ktx); 10975cee9645SThomas Gleixner 10985cee9645SThomas Gleixner if (err >= 0 && copy_to_user(utx, &ktx, sizeof(ktx))) 10995cee9645SThomas Gleixner return -EFAULT; 11005cee9645SThomas Gleixner 11015cee9645SThomas Gleixner return err; 11025cee9645SThomas Gleixner } 11035cee9645SThomas Gleixner 1104d822cdccSAl Viro SYSCALL_DEFINE2(clock_getres, const clockid_t, which_clock, 1105d822cdccSAl Viro struct timespec __user *, tp) 1106d822cdccSAl Viro { 1107d822cdccSAl Viro const struct k_clock *kc = clockid_to_kclock(which_clock); 11085c499410SDeepa Dinamani struct timespec64 rtn_tp; 1109d822cdccSAl Viro int error; 1110d822cdccSAl Viro 1111d822cdccSAl Viro if (!kc) 1112d822cdccSAl Viro return -EINVAL; 1113d822cdccSAl Viro 11145c499410SDeepa Dinamani error = kc->clock_getres(which_clock, &rtn_tp); 1115d822cdccSAl Viro 11165c499410SDeepa Dinamani if (!error && tp && put_timespec64(&rtn_tp, tp)) 1117d822cdccSAl Viro error = -EFAULT; 1118d822cdccSAl Viro 1119d822cdccSAl Viro return error; 1120d822cdccSAl Viro } 1121d822cdccSAl Viro 11223a4d44b6SAl Viro #ifdef CONFIG_COMPAT 11233a4d44b6SAl Viro 1124d822cdccSAl Viro COMPAT_SYSCALL_DEFINE2(clock_settime, clockid_t, which_clock, 1125d822cdccSAl Viro struct compat_timespec __user *, tp) 1126d822cdccSAl Viro { 1127d822cdccSAl Viro const struct k_clock *kc = clockid_to_kclock(which_clock); 11285c499410SDeepa Dinamani struct timespec64 ts; 1129d822cdccSAl Viro 1130d822cdccSAl Viro if (!kc || !kc->clock_set) 1131d822cdccSAl Viro return -EINVAL; 1132d822cdccSAl Viro 11335c499410SDeepa Dinamani if (compat_get_timespec64(&ts, tp)) 1134d822cdccSAl Viro return -EFAULT; 1135d822cdccSAl Viro 11365c499410SDeepa Dinamani return kc->clock_set(which_clock, &ts); 1137d822cdccSAl Viro } 1138d822cdccSAl Viro 1139d822cdccSAl Viro COMPAT_SYSCALL_DEFINE2(clock_gettime, clockid_t, which_clock, 1140d822cdccSAl Viro struct compat_timespec __user *, tp) 1141d822cdccSAl Viro { 1142d822cdccSAl Viro const struct k_clock *kc = clockid_to_kclock(which_clock); 11435c499410SDeepa Dinamani struct timespec64 ts; 11445c499410SDeepa Dinamani int err; 1145d822cdccSAl Viro 1146d822cdccSAl Viro if (!kc) 1147d822cdccSAl Viro return -EINVAL; 1148d822cdccSAl Viro 11495c499410SDeepa Dinamani err = kc->clock_get(which_clock, &ts); 1150d822cdccSAl Viro 11515c499410SDeepa Dinamani if (!err && compat_put_timespec64(&ts, tp)) 11525c499410SDeepa Dinamani err = -EFAULT; 1153d822cdccSAl Viro 11545c499410SDeepa Dinamani return err; 1155d822cdccSAl Viro } 1156d822cdccSAl Viro 11573a4d44b6SAl Viro COMPAT_SYSCALL_DEFINE2(clock_adjtime, clockid_t, which_clock, 11583a4d44b6SAl Viro struct compat_timex __user *, utp) 11593a4d44b6SAl Viro { 11603a4d44b6SAl Viro const struct k_clock *kc = clockid_to_kclock(which_clock); 11613a4d44b6SAl Viro struct timex ktx; 11623a4d44b6SAl Viro int err; 11633a4d44b6SAl Viro 11643a4d44b6SAl Viro if (!kc) 11653a4d44b6SAl Viro return -EINVAL; 11663a4d44b6SAl Viro if (!kc->clock_adj) 11673a4d44b6SAl Viro return -EOPNOTSUPP; 11683a4d44b6SAl Viro 11693a4d44b6SAl Viro err = compat_get_timex(&ktx, utp); 11703a4d44b6SAl Viro if (err) 11713a4d44b6SAl Viro return err; 11723a4d44b6SAl Viro 11733a4d44b6SAl Viro err = kc->clock_adj(which_clock, &ktx); 11743a4d44b6SAl Viro 11753a4d44b6SAl Viro if (err >= 0) 11763a4d44b6SAl Viro err = compat_put_timex(utp, &ktx); 11773a4d44b6SAl Viro 11783a4d44b6SAl Viro return err; 11793a4d44b6SAl Viro } 11803a4d44b6SAl Viro 1181d822cdccSAl Viro COMPAT_SYSCALL_DEFINE2(clock_getres, clockid_t, which_clock, 1182d822cdccSAl Viro struct compat_timespec __user *, tp) 11835cee9645SThomas Gleixner { 1184d3ba5a9aSChristoph Hellwig const struct k_clock *kc = clockid_to_kclock(which_clock); 11855c499410SDeepa Dinamani struct timespec64 ts; 11865c499410SDeepa Dinamani int err; 11875cee9645SThomas Gleixner 11885cee9645SThomas Gleixner if (!kc) 11895cee9645SThomas Gleixner return -EINVAL; 11905cee9645SThomas Gleixner 11915c499410SDeepa Dinamani err = kc->clock_getres(which_clock, &ts); 11925c499410SDeepa Dinamani if (!err && tp && compat_put_timespec64(&ts, tp)) 11935c499410SDeepa Dinamani return -EFAULT; 11945cee9645SThomas Gleixner 11955c499410SDeepa Dinamani return err; 11965cee9645SThomas Gleixner } 11975c499410SDeepa Dinamani 1198d822cdccSAl Viro #endif 11995cee9645SThomas Gleixner 12005cee9645SThomas Gleixner /* 12015cee9645SThomas Gleixner * nanosleep for monotonic and realtime clocks 12025cee9645SThomas Gleixner */ 12035cee9645SThomas Gleixner static int common_nsleep(const clockid_t which_clock, int flags, 1204938e7cf2SThomas Gleixner const struct timespec64 *rqtp) 12055cee9645SThomas Gleixner { 1206938e7cf2SThomas Gleixner return hrtimer_nanosleep(rqtp, flags & TIMER_ABSTIME ? 12075cee9645SThomas Gleixner HRTIMER_MODE_ABS : HRTIMER_MODE_REL, 12085cee9645SThomas Gleixner which_clock); 12095cee9645SThomas Gleixner } 12105cee9645SThomas Gleixner 12115cee9645SThomas Gleixner SYSCALL_DEFINE4(clock_nanosleep, const clockid_t, which_clock, int, flags, 12125cee9645SThomas Gleixner const struct timespec __user *, rqtp, 12135cee9645SThomas Gleixner struct timespec __user *, rmtp) 12145cee9645SThomas Gleixner { 1215d3ba5a9aSChristoph Hellwig const struct k_clock *kc = clockid_to_kclock(which_clock); 1216ad196384SDeepa Dinamani struct timespec64 t64; 12175cee9645SThomas Gleixner struct timespec t; 12185cee9645SThomas Gleixner 12195cee9645SThomas Gleixner if (!kc) 12205cee9645SThomas Gleixner return -EINVAL; 12215cee9645SThomas Gleixner if (!kc->nsleep) 12225cee9645SThomas Gleixner return -ENANOSLEEP_NOTSUP; 12235cee9645SThomas Gleixner 12245cee9645SThomas Gleixner if (copy_from_user(&t, rqtp, sizeof (struct timespec))) 12255cee9645SThomas Gleixner return -EFAULT; 12265cee9645SThomas Gleixner 1227ad196384SDeepa Dinamani t64 = timespec_to_timespec64(t); 1228ad196384SDeepa Dinamani if (!timespec64_valid(&t64)) 12295cee9645SThomas Gleixner return -EINVAL; 123099e6c0e6SAl Viro if (flags & TIMER_ABSTIME) 123199e6c0e6SAl Viro rmtp = NULL; 1232edbeda46SAl Viro current->restart_block.nanosleep.type = rmtp ? TT_NATIVE : TT_NONE; 123399e6c0e6SAl Viro current->restart_block.nanosleep.rmtp = rmtp; 12345cee9645SThomas Gleixner 123599e6c0e6SAl Viro return kc->nsleep(which_clock, flags, &t64); 12365cee9645SThomas Gleixner } 12375cee9645SThomas Gleixner 1238edbeda46SAl Viro #ifdef CONFIG_COMPAT 1239edbeda46SAl Viro COMPAT_SYSCALL_DEFINE4(clock_nanosleep, clockid_t, which_clock, int, flags, 1240edbeda46SAl Viro struct compat_timespec __user *, rqtp, 1241edbeda46SAl Viro struct compat_timespec __user *, rmtp) 12425cee9645SThomas Gleixner { 1243d3ba5a9aSChristoph Hellwig const struct k_clock *kc = clockid_to_kclock(which_clock); 1244edbeda46SAl Viro struct timespec64 t64; 1245edbeda46SAl Viro struct timespec t; 12465cee9645SThomas Gleixner 1247edbeda46SAl Viro if (!kc) 12485cee9645SThomas Gleixner return -EINVAL; 1249edbeda46SAl Viro if (!kc->nsleep) 1250edbeda46SAl Viro return -ENANOSLEEP_NOTSUP; 12515cee9645SThomas Gleixner 1252edbeda46SAl Viro if (compat_get_timespec(&t, rqtp)) 1253edbeda46SAl Viro return -EFAULT; 1254edbeda46SAl Viro 1255edbeda46SAl Viro t64 = timespec_to_timespec64(t); 1256edbeda46SAl Viro if (!timespec64_valid(&t64)) 1257edbeda46SAl Viro return -EINVAL; 1258edbeda46SAl Viro if (flags & TIMER_ABSTIME) 1259edbeda46SAl Viro rmtp = NULL; 1260edbeda46SAl Viro current->restart_block.nanosleep.type = rmtp ? TT_COMPAT : TT_NONE; 1261edbeda46SAl Viro current->restart_block.nanosleep.compat_rmtp = rmtp; 1262edbeda46SAl Viro 1263edbeda46SAl Viro return kc->nsleep(which_clock, flags, &t64); 12645cee9645SThomas Gleixner } 1265edbeda46SAl Viro #endif 12666631fa12SThomas Gleixner 12676631fa12SThomas Gleixner static const struct k_clock clock_realtime = { 12686631fa12SThomas Gleixner .clock_getres = posix_get_hrtimer_res, 12696631fa12SThomas Gleixner .clock_get = posix_clock_realtime_get, 12706631fa12SThomas Gleixner .clock_set = posix_clock_realtime_set, 12716631fa12SThomas Gleixner .clock_adj = posix_clock_realtime_adj, 12726631fa12SThomas Gleixner .nsleep = common_nsleep, 12736631fa12SThomas Gleixner .timer_create = common_timer_create, 12746631fa12SThomas Gleixner .timer_set = common_timer_set, 12756631fa12SThomas Gleixner .timer_get = common_timer_get, 12766631fa12SThomas Gleixner .timer_del = common_timer_del, 1277f37fb0aaSThomas Gleixner .timer_rearm = common_hrtimer_rearm, 127891d57baeSThomas Gleixner .timer_forward = common_hrtimer_forward, 127991d57baeSThomas Gleixner .timer_remaining = common_hrtimer_remaining, 1280eae1c4aeSThomas Gleixner .timer_try_to_cancel = common_hrtimer_try_to_cancel, 1281eae1c4aeSThomas Gleixner .timer_arm = common_hrtimer_arm, 12826631fa12SThomas Gleixner }; 12836631fa12SThomas Gleixner 12846631fa12SThomas Gleixner static const struct k_clock clock_monotonic = { 12856631fa12SThomas Gleixner .clock_getres = posix_get_hrtimer_res, 12866631fa12SThomas Gleixner .clock_get = posix_ktime_get_ts, 12876631fa12SThomas Gleixner .nsleep = common_nsleep, 12886631fa12SThomas Gleixner .timer_create = common_timer_create, 12896631fa12SThomas Gleixner .timer_set = common_timer_set, 12906631fa12SThomas Gleixner .timer_get = common_timer_get, 12916631fa12SThomas Gleixner .timer_del = common_timer_del, 1292f37fb0aaSThomas Gleixner .timer_rearm = common_hrtimer_rearm, 129391d57baeSThomas Gleixner .timer_forward = common_hrtimer_forward, 129491d57baeSThomas Gleixner .timer_remaining = common_hrtimer_remaining, 1295eae1c4aeSThomas Gleixner .timer_try_to_cancel = common_hrtimer_try_to_cancel, 1296eae1c4aeSThomas Gleixner .timer_arm = common_hrtimer_arm, 12976631fa12SThomas Gleixner }; 12986631fa12SThomas Gleixner 12996631fa12SThomas Gleixner static const struct k_clock clock_monotonic_raw = { 13006631fa12SThomas Gleixner .clock_getres = posix_get_hrtimer_res, 13016631fa12SThomas Gleixner .clock_get = posix_get_monotonic_raw, 13026631fa12SThomas Gleixner }; 13036631fa12SThomas Gleixner 13046631fa12SThomas Gleixner static const struct k_clock clock_realtime_coarse = { 13056631fa12SThomas Gleixner .clock_getres = posix_get_coarse_res, 13066631fa12SThomas Gleixner .clock_get = posix_get_realtime_coarse, 13076631fa12SThomas Gleixner }; 13086631fa12SThomas Gleixner 13096631fa12SThomas Gleixner static const struct k_clock clock_monotonic_coarse = { 13106631fa12SThomas Gleixner .clock_getres = posix_get_coarse_res, 13116631fa12SThomas Gleixner .clock_get = posix_get_monotonic_coarse, 13126631fa12SThomas Gleixner }; 13136631fa12SThomas Gleixner 13146631fa12SThomas Gleixner static const struct k_clock clock_tai = { 13156631fa12SThomas Gleixner .clock_getres = posix_get_hrtimer_res, 13166631fa12SThomas Gleixner .clock_get = posix_get_tai, 13176631fa12SThomas Gleixner .nsleep = common_nsleep, 13186631fa12SThomas Gleixner .timer_create = common_timer_create, 13196631fa12SThomas Gleixner .timer_set = common_timer_set, 13206631fa12SThomas Gleixner .timer_get = common_timer_get, 13216631fa12SThomas Gleixner .timer_del = common_timer_del, 1322f37fb0aaSThomas Gleixner .timer_rearm = common_hrtimer_rearm, 132391d57baeSThomas Gleixner .timer_forward = common_hrtimer_forward, 132491d57baeSThomas Gleixner .timer_remaining = common_hrtimer_remaining, 1325eae1c4aeSThomas Gleixner .timer_try_to_cancel = common_hrtimer_try_to_cancel, 1326eae1c4aeSThomas Gleixner .timer_arm = common_hrtimer_arm, 13276631fa12SThomas Gleixner }; 13286631fa12SThomas Gleixner 13296631fa12SThomas Gleixner static const struct k_clock clock_boottime = { 13306631fa12SThomas Gleixner .clock_getres = posix_get_hrtimer_res, 13316631fa12SThomas Gleixner .clock_get = posix_get_boottime, 13326631fa12SThomas Gleixner .nsleep = common_nsleep, 13336631fa12SThomas Gleixner .timer_create = common_timer_create, 13346631fa12SThomas Gleixner .timer_set = common_timer_set, 13356631fa12SThomas Gleixner .timer_get = common_timer_get, 13366631fa12SThomas Gleixner .timer_del = common_timer_del, 1337f37fb0aaSThomas Gleixner .timer_rearm = common_hrtimer_rearm, 133891d57baeSThomas Gleixner .timer_forward = common_hrtimer_forward, 133991d57baeSThomas Gleixner .timer_remaining = common_hrtimer_remaining, 1340eae1c4aeSThomas Gleixner .timer_try_to_cancel = common_hrtimer_try_to_cancel, 1341eae1c4aeSThomas Gleixner .timer_arm = common_hrtimer_arm, 13426631fa12SThomas Gleixner }; 13436631fa12SThomas Gleixner 13446631fa12SThomas Gleixner static const struct k_clock * const posix_clocks[] = { 13456631fa12SThomas Gleixner [CLOCK_REALTIME] = &clock_realtime, 13466631fa12SThomas Gleixner [CLOCK_MONOTONIC] = &clock_monotonic, 13476631fa12SThomas Gleixner [CLOCK_PROCESS_CPUTIME_ID] = &clock_process, 13486631fa12SThomas Gleixner [CLOCK_THREAD_CPUTIME_ID] = &clock_thread, 13496631fa12SThomas Gleixner [CLOCK_MONOTONIC_RAW] = &clock_monotonic_raw, 13506631fa12SThomas Gleixner [CLOCK_REALTIME_COARSE] = &clock_realtime_coarse, 13516631fa12SThomas Gleixner [CLOCK_MONOTONIC_COARSE] = &clock_monotonic_coarse, 13526631fa12SThomas Gleixner [CLOCK_BOOTTIME] = &clock_boottime, 13536631fa12SThomas Gleixner [CLOCK_REALTIME_ALARM] = &alarm_clock, 13546631fa12SThomas Gleixner [CLOCK_BOOTTIME_ALARM] = &alarm_clock, 13556631fa12SThomas Gleixner [CLOCK_TAI] = &clock_tai, 13566631fa12SThomas Gleixner }; 13576631fa12SThomas Gleixner 13586631fa12SThomas Gleixner static const struct k_clock *clockid_to_kclock(const clockid_t id) 13596631fa12SThomas Gleixner { 13606631fa12SThomas Gleixner if (id < 0) 13616631fa12SThomas Gleixner return (id & CLOCKFD_MASK) == CLOCKFD ? 13626631fa12SThomas Gleixner &clock_posix_dynamic : &clock_posix_cpu; 13636631fa12SThomas Gleixner 13646631fa12SThomas Gleixner if (id >= ARRAY_SIZE(posix_clocks) || !posix_clocks[id]) 13656631fa12SThomas Gleixner return NULL; 13666631fa12SThomas Gleixner return posix_clocks[id]; 13676631fa12SThomas Gleixner } 1368