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> 385cee9645SThomas Gleixner 397c0f6ba6SLinus Torvalds #include <linux/uaccess.h> 405cee9645SThomas Gleixner #include <linux/list.h> 415cee9645SThomas Gleixner #include <linux/init.h> 425cee9645SThomas Gleixner #include <linux/compiler.h> 435cee9645SThomas Gleixner #include <linux/hash.h> 445cee9645SThomas Gleixner #include <linux/posix-clock.h> 455cee9645SThomas Gleixner #include <linux/posix-timers.h> 465cee9645SThomas Gleixner #include <linux/syscalls.h> 475cee9645SThomas Gleixner #include <linux/wait.h> 485cee9645SThomas Gleixner #include <linux/workqueue.h> 495cee9645SThomas Gleixner #include <linux/export.h> 505cee9645SThomas Gleixner #include <linux/hashtable.h> 515cee9645SThomas Gleixner 528b094cd0SThomas Gleixner #include "timekeeping.h" 538b094cd0SThomas Gleixner 545cee9645SThomas Gleixner /* 555cee9645SThomas Gleixner * Management arrays for POSIX timers. Timers are now kept in static hash table 565cee9645SThomas Gleixner * with 512 entries. 575cee9645SThomas Gleixner * Timer ids are allocated by local routine, which selects proper hash head by 585cee9645SThomas Gleixner * key, constructed from current->signal address and per signal struct counter. 595cee9645SThomas Gleixner * This keeps timer ids unique per process, but now they can intersect between 605cee9645SThomas Gleixner * processes. 615cee9645SThomas Gleixner */ 625cee9645SThomas Gleixner 635cee9645SThomas Gleixner /* 645cee9645SThomas Gleixner * Lets keep our timers in a slab cache :-) 655cee9645SThomas Gleixner */ 665cee9645SThomas Gleixner static struct kmem_cache *posix_timers_cache; 675cee9645SThomas Gleixner 685cee9645SThomas Gleixner static DEFINE_HASHTABLE(posix_timers_hashtable, 9); 695cee9645SThomas Gleixner static DEFINE_SPINLOCK(hash_lock); 705cee9645SThomas Gleixner 715cee9645SThomas Gleixner /* 725cee9645SThomas Gleixner * we assume that the new SIGEV_THREAD_ID shares no bits with the other 735cee9645SThomas Gleixner * SIGEV values. Here we put out an error if this assumption fails. 745cee9645SThomas Gleixner */ 755cee9645SThomas Gleixner #if SIGEV_THREAD_ID != (SIGEV_THREAD_ID & \ 765cee9645SThomas Gleixner ~(SIGEV_SIGNAL | SIGEV_NONE | SIGEV_THREAD)) 775cee9645SThomas Gleixner #error "SIGEV_THREAD_ID must not share bit with other SIGEV values!" 785cee9645SThomas Gleixner #endif 795cee9645SThomas Gleixner 805cee9645SThomas Gleixner /* 815cee9645SThomas Gleixner * parisc wants ENOTSUP instead of EOPNOTSUPP 825cee9645SThomas Gleixner */ 835cee9645SThomas Gleixner #ifndef ENOTSUP 845cee9645SThomas Gleixner # define ENANOSLEEP_NOTSUP EOPNOTSUPP 855cee9645SThomas Gleixner #else 865cee9645SThomas Gleixner # define ENANOSLEEP_NOTSUP ENOTSUP 875cee9645SThomas Gleixner #endif 885cee9645SThomas Gleixner 895cee9645SThomas Gleixner /* 905cee9645SThomas Gleixner * The timer ID is turned into a timer address by idr_find(). 915cee9645SThomas Gleixner * Verifying a valid ID consists of: 925cee9645SThomas Gleixner * 935cee9645SThomas Gleixner * a) checking that idr_find() returns other than -1. 945cee9645SThomas Gleixner * b) checking that the timer id matches the one in the timer itself. 955cee9645SThomas Gleixner * c) that the timer owner is in the callers thread group. 965cee9645SThomas Gleixner */ 975cee9645SThomas Gleixner 985cee9645SThomas Gleixner /* 995cee9645SThomas Gleixner * CLOCKs: The POSIX standard calls for a couple of clocks and allows us 1005cee9645SThomas Gleixner * to implement others. This structure defines the various 1015cee9645SThomas Gleixner * clocks. 1025cee9645SThomas Gleixner * 1035cee9645SThomas Gleixner * RESOLUTION: Clock resolution is used to round up timer and interval 1045cee9645SThomas Gleixner * times, NOT to report clock times, which are reported with as 1055cee9645SThomas Gleixner * much resolution as the system can muster. In some cases this 1065cee9645SThomas Gleixner * resolution may depend on the underlying clock hardware and 1075cee9645SThomas Gleixner * may not be quantifiable until run time, and only then is the 1085cee9645SThomas Gleixner * necessary code is written. The standard says we should say 1095cee9645SThomas Gleixner * something about this issue in the documentation... 1105cee9645SThomas Gleixner * 1115cee9645SThomas Gleixner * FUNCTIONS: The CLOCKs structure defines possible functions to 1125cee9645SThomas Gleixner * handle various clock functions. 1135cee9645SThomas Gleixner * 1145cee9645SThomas Gleixner * The standard POSIX timer management code assumes the 1155cee9645SThomas Gleixner * following: 1.) The k_itimer struct (sched.h) is used for 1165cee9645SThomas Gleixner * the timer. 2.) The list, it_lock, it_clock, it_id and 1175cee9645SThomas Gleixner * it_pid fields are not modified by timer code. 1185cee9645SThomas Gleixner * 1195cee9645SThomas Gleixner * Permissions: It is assumed that the clock_settime() function defined 1205cee9645SThomas Gleixner * for each clock will take care of permission checks. Some 1215cee9645SThomas Gleixner * clocks may be set able by any user (i.e. local process 1225cee9645SThomas Gleixner * clocks) others not. Currently the only set able clock we 1235cee9645SThomas Gleixner * have is CLOCK_REALTIME and its high res counter part, both of 1245cee9645SThomas Gleixner * which we beg off on and pass to do_sys_settimeofday(). 1255cee9645SThomas Gleixner */ 1265cee9645SThomas Gleixner 1275cee9645SThomas Gleixner static struct k_clock posix_clocks[MAX_CLOCKS]; 1285cee9645SThomas Gleixner 1295cee9645SThomas Gleixner /* 1305cee9645SThomas Gleixner * These ones are defined below. 1315cee9645SThomas Gleixner */ 1325cee9645SThomas Gleixner static int common_nsleep(const clockid_t, int flags, struct timespec *t, 1335cee9645SThomas Gleixner struct timespec __user *rmtp); 1345cee9645SThomas Gleixner static int common_timer_create(struct k_itimer *new_timer); 1355cee9645SThomas Gleixner static void common_timer_get(struct k_itimer *, struct itimerspec *); 1365cee9645SThomas Gleixner static int common_timer_set(struct k_itimer *, int, 1375cee9645SThomas Gleixner struct itimerspec *, struct itimerspec *); 1385cee9645SThomas Gleixner static int common_timer_del(struct k_itimer *timer); 1395cee9645SThomas Gleixner 1405cee9645SThomas Gleixner static enum hrtimer_restart posix_timer_fn(struct hrtimer *data); 1415cee9645SThomas Gleixner 1425cee9645SThomas Gleixner static struct k_itimer *__lock_timer(timer_t timer_id, unsigned long *flags); 1435cee9645SThomas Gleixner 1445cee9645SThomas Gleixner #define lock_timer(tid, flags) \ 1455cee9645SThomas Gleixner ({ struct k_itimer *__timr; \ 1465cee9645SThomas Gleixner __cond_lock(&__timr->it_lock, __timr = __lock_timer(tid, flags)); \ 1475cee9645SThomas Gleixner __timr; \ 1485cee9645SThomas Gleixner }) 1495cee9645SThomas Gleixner 1505cee9645SThomas Gleixner static int hash(struct signal_struct *sig, unsigned int nr) 1515cee9645SThomas Gleixner { 1525cee9645SThomas Gleixner return hash_32(hash32_ptr(sig) ^ nr, HASH_BITS(posix_timers_hashtable)); 1535cee9645SThomas Gleixner } 1545cee9645SThomas Gleixner 1555cee9645SThomas Gleixner static struct k_itimer *__posix_timers_find(struct hlist_head *head, 1565cee9645SThomas Gleixner struct signal_struct *sig, 1575cee9645SThomas Gleixner timer_t id) 1585cee9645SThomas Gleixner { 1595cee9645SThomas Gleixner struct k_itimer *timer; 1605cee9645SThomas Gleixner 1615cee9645SThomas Gleixner hlist_for_each_entry_rcu(timer, head, t_hash) { 1625cee9645SThomas Gleixner if ((timer->it_signal == sig) && (timer->it_id == id)) 1635cee9645SThomas Gleixner return timer; 1645cee9645SThomas Gleixner } 1655cee9645SThomas Gleixner return NULL; 1665cee9645SThomas Gleixner } 1675cee9645SThomas Gleixner 1685cee9645SThomas Gleixner static struct k_itimer *posix_timer_by_id(timer_t id) 1695cee9645SThomas Gleixner { 1705cee9645SThomas Gleixner struct signal_struct *sig = current->signal; 1715cee9645SThomas Gleixner struct hlist_head *head = &posix_timers_hashtable[hash(sig, id)]; 1725cee9645SThomas Gleixner 1735cee9645SThomas Gleixner return __posix_timers_find(head, sig, id); 1745cee9645SThomas Gleixner } 1755cee9645SThomas Gleixner 1765cee9645SThomas Gleixner static int posix_timer_add(struct k_itimer *timer) 1775cee9645SThomas Gleixner { 1785cee9645SThomas Gleixner struct signal_struct *sig = current->signal; 1795cee9645SThomas Gleixner int first_free_id = sig->posix_timer_id; 1805cee9645SThomas Gleixner struct hlist_head *head; 1815cee9645SThomas Gleixner int ret = -ENOENT; 1825cee9645SThomas Gleixner 1835cee9645SThomas Gleixner do { 1845cee9645SThomas Gleixner spin_lock(&hash_lock); 1855cee9645SThomas Gleixner head = &posix_timers_hashtable[hash(sig, sig->posix_timer_id)]; 1865cee9645SThomas Gleixner if (!__posix_timers_find(head, sig, sig->posix_timer_id)) { 1875cee9645SThomas Gleixner hlist_add_head_rcu(&timer->t_hash, head); 1885cee9645SThomas Gleixner ret = sig->posix_timer_id; 1895cee9645SThomas Gleixner } 1905cee9645SThomas Gleixner if (++sig->posix_timer_id < 0) 1915cee9645SThomas Gleixner sig->posix_timer_id = 0; 1925cee9645SThomas Gleixner if ((sig->posix_timer_id == first_free_id) && (ret == -ENOENT)) 1935cee9645SThomas Gleixner /* Loop over all possible ids completed */ 1945cee9645SThomas Gleixner ret = -EAGAIN; 1955cee9645SThomas Gleixner spin_unlock(&hash_lock); 1965cee9645SThomas Gleixner } while (ret == -ENOENT); 1975cee9645SThomas Gleixner return ret; 1985cee9645SThomas Gleixner } 1995cee9645SThomas Gleixner 2005cee9645SThomas Gleixner static inline void unlock_timer(struct k_itimer *timr, unsigned long flags) 2015cee9645SThomas Gleixner { 2025cee9645SThomas Gleixner spin_unlock_irqrestore(&timr->it_lock, flags); 2035cee9645SThomas Gleixner } 2045cee9645SThomas Gleixner 2055cee9645SThomas Gleixner /* Get clock_realtime */ 2065cee9645SThomas Gleixner static int posix_clock_realtime_get(clockid_t which_clock, struct timespec *tp) 2075cee9645SThomas Gleixner { 2085cee9645SThomas Gleixner ktime_get_real_ts(tp); 2095cee9645SThomas Gleixner return 0; 2105cee9645SThomas Gleixner } 2115cee9645SThomas Gleixner 2125cee9645SThomas Gleixner /* Set clock_realtime */ 2135cee9645SThomas Gleixner static int posix_clock_realtime_set(const clockid_t which_clock, 2145cee9645SThomas Gleixner const struct timespec *tp) 2155cee9645SThomas Gleixner { 2165cee9645SThomas Gleixner return do_sys_settimeofday(tp, NULL); 2175cee9645SThomas Gleixner } 2185cee9645SThomas Gleixner 2195cee9645SThomas Gleixner static int posix_clock_realtime_adj(const clockid_t which_clock, 2205cee9645SThomas Gleixner struct timex *t) 2215cee9645SThomas Gleixner { 2225cee9645SThomas Gleixner return do_adjtimex(t); 2235cee9645SThomas Gleixner } 2245cee9645SThomas Gleixner 2255cee9645SThomas Gleixner /* 2265cee9645SThomas Gleixner * Get monotonic time for posix timers 2275cee9645SThomas Gleixner */ 2285cee9645SThomas Gleixner static int posix_ktime_get_ts(clockid_t which_clock, struct timespec *tp) 2295cee9645SThomas Gleixner { 2305cee9645SThomas Gleixner ktime_get_ts(tp); 2315cee9645SThomas Gleixner return 0; 2325cee9645SThomas Gleixner } 2335cee9645SThomas Gleixner 2345cee9645SThomas Gleixner /* 2355cee9645SThomas Gleixner * Get monotonic-raw time for posix timers 2365cee9645SThomas Gleixner */ 2375cee9645SThomas Gleixner static int posix_get_monotonic_raw(clockid_t which_clock, struct timespec *tp) 2385cee9645SThomas Gleixner { 2395cee9645SThomas Gleixner getrawmonotonic(tp); 2405cee9645SThomas Gleixner return 0; 2415cee9645SThomas Gleixner } 2425cee9645SThomas Gleixner 2435cee9645SThomas Gleixner 2445cee9645SThomas Gleixner static int posix_get_realtime_coarse(clockid_t which_clock, struct timespec *tp) 2455cee9645SThomas Gleixner { 2465cee9645SThomas Gleixner *tp = current_kernel_time(); 2475cee9645SThomas Gleixner return 0; 2485cee9645SThomas Gleixner } 2495cee9645SThomas Gleixner 2505cee9645SThomas Gleixner static int posix_get_monotonic_coarse(clockid_t which_clock, 2515cee9645SThomas Gleixner struct timespec *tp) 2525cee9645SThomas Gleixner { 2535cee9645SThomas Gleixner *tp = get_monotonic_coarse(); 2545cee9645SThomas Gleixner return 0; 2555cee9645SThomas Gleixner } 2565cee9645SThomas Gleixner 2575cee9645SThomas Gleixner static int posix_get_coarse_res(const clockid_t which_clock, struct timespec *tp) 2585cee9645SThomas Gleixner { 2595cee9645SThomas Gleixner *tp = ktime_to_timespec(KTIME_LOW_RES); 2605cee9645SThomas Gleixner return 0; 2615cee9645SThomas Gleixner } 2625cee9645SThomas Gleixner 2635cee9645SThomas Gleixner static int posix_get_boottime(const clockid_t which_clock, struct timespec *tp) 2645cee9645SThomas Gleixner { 2655cee9645SThomas Gleixner get_monotonic_boottime(tp); 2665cee9645SThomas Gleixner return 0; 2675cee9645SThomas Gleixner } 2685cee9645SThomas Gleixner 2695cee9645SThomas Gleixner static int posix_get_tai(clockid_t which_clock, struct timespec *tp) 2705cee9645SThomas Gleixner { 2715cee9645SThomas Gleixner timekeeping_clocktai(tp); 2725cee9645SThomas Gleixner return 0; 2735cee9645SThomas Gleixner } 2745cee9645SThomas Gleixner 275056a3cacSThomas Gleixner static int posix_get_hrtimer_res(clockid_t which_clock, struct timespec *tp) 276056a3cacSThomas Gleixner { 277056a3cacSThomas Gleixner tp->tv_sec = 0; 278056a3cacSThomas Gleixner tp->tv_nsec = hrtimer_resolution; 279056a3cacSThomas Gleixner return 0; 280056a3cacSThomas Gleixner } 281056a3cacSThomas Gleixner 2825cee9645SThomas Gleixner /* 2835cee9645SThomas Gleixner * Initialize everything, well, just everything in Posix clocks/timers ;) 2845cee9645SThomas Gleixner */ 2855cee9645SThomas Gleixner static __init int init_posix_timers(void) 2865cee9645SThomas Gleixner { 2875cee9645SThomas Gleixner struct k_clock clock_realtime = { 288056a3cacSThomas Gleixner .clock_getres = posix_get_hrtimer_res, 2895cee9645SThomas Gleixner .clock_get = posix_clock_realtime_get, 2905cee9645SThomas Gleixner .clock_set = posix_clock_realtime_set, 2915cee9645SThomas Gleixner .clock_adj = posix_clock_realtime_adj, 2925cee9645SThomas Gleixner .nsleep = common_nsleep, 2935cee9645SThomas Gleixner .nsleep_restart = hrtimer_nanosleep_restart, 2945cee9645SThomas Gleixner .timer_create = common_timer_create, 2955cee9645SThomas Gleixner .timer_set = common_timer_set, 2965cee9645SThomas Gleixner .timer_get = common_timer_get, 2975cee9645SThomas Gleixner .timer_del = common_timer_del, 2985cee9645SThomas Gleixner }; 2995cee9645SThomas Gleixner struct k_clock clock_monotonic = { 300056a3cacSThomas Gleixner .clock_getres = posix_get_hrtimer_res, 3015cee9645SThomas Gleixner .clock_get = posix_ktime_get_ts, 3025cee9645SThomas Gleixner .nsleep = common_nsleep, 3035cee9645SThomas Gleixner .nsleep_restart = hrtimer_nanosleep_restart, 3045cee9645SThomas Gleixner .timer_create = common_timer_create, 3055cee9645SThomas Gleixner .timer_set = common_timer_set, 3065cee9645SThomas Gleixner .timer_get = common_timer_get, 3075cee9645SThomas Gleixner .timer_del = common_timer_del, 3085cee9645SThomas Gleixner }; 3095cee9645SThomas Gleixner struct k_clock clock_monotonic_raw = { 310056a3cacSThomas Gleixner .clock_getres = posix_get_hrtimer_res, 3115cee9645SThomas Gleixner .clock_get = posix_get_monotonic_raw, 3125cee9645SThomas Gleixner }; 3135cee9645SThomas Gleixner struct k_clock clock_realtime_coarse = { 3145cee9645SThomas Gleixner .clock_getres = posix_get_coarse_res, 3155cee9645SThomas Gleixner .clock_get = posix_get_realtime_coarse, 3165cee9645SThomas Gleixner }; 3175cee9645SThomas Gleixner struct k_clock clock_monotonic_coarse = { 3185cee9645SThomas Gleixner .clock_getres = posix_get_coarse_res, 3195cee9645SThomas Gleixner .clock_get = posix_get_monotonic_coarse, 3205cee9645SThomas Gleixner }; 3215cee9645SThomas Gleixner struct k_clock clock_tai = { 322056a3cacSThomas Gleixner .clock_getres = posix_get_hrtimer_res, 3235cee9645SThomas Gleixner .clock_get = posix_get_tai, 3245cee9645SThomas Gleixner .nsleep = common_nsleep, 3255cee9645SThomas Gleixner .nsleep_restart = hrtimer_nanosleep_restart, 3265cee9645SThomas Gleixner .timer_create = common_timer_create, 3275cee9645SThomas Gleixner .timer_set = common_timer_set, 3285cee9645SThomas Gleixner .timer_get = common_timer_get, 3295cee9645SThomas Gleixner .timer_del = common_timer_del, 3305cee9645SThomas Gleixner }; 3315cee9645SThomas Gleixner struct k_clock clock_boottime = { 332056a3cacSThomas Gleixner .clock_getres = posix_get_hrtimer_res, 3335cee9645SThomas Gleixner .clock_get = posix_get_boottime, 3345cee9645SThomas Gleixner .nsleep = common_nsleep, 3355cee9645SThomas Gleixner .nsleep_restart = hrtimer_nanosleep_restart, 3365cee9645SThomas Gleixner .timer_create = common_timer_create, 3375cee9645SThomas Gleixner .timer_set = common_timer_set, 3385cee9645SThomas Gleixner .timer_get = common_timer_get, 3395cee9645SThomas Gleixner .timer_del = common_timer_del, 3405cee9645SThomas Gleixner }; 3415cee9645SThomas Gleixner 3425cee9645SThomas Gleixner posix_timers_register_clock(CLOCK_REALTIME, &clock_realtime); 3435cee9645SThomas Gleixner posix_timers_register_clock(CLOCK_MONOTONIC, &clock_monotonic); 3445cee9645SThomas Gleixner posix_timers_register_clock(CLOCK_MONOTONIC_RAW, &clock_monotonic_raw); 3455cee9645SThomas Gleixner posix_timers_register_clock(CLOCK_REALTIME_COARSE, &clock_realtime_coarse); 3465cee9645SThomas Gleixner posix_timers_register_clock(CLOCK_MONOTONIC_COARSE, &clock_monotonic_coarse); 3475cee9645SThomas Gleixner posix_timers_register_clock(CLOCK_BOOTTIME, &clock_boottime); 3485cee9645SThomas Gleixner posix_timers_register_clock(CLOCK_TAI, &clock_tai); 3495cee9645SThomas Gleixner 3505cee9645SThomas Gleixner posix_timers_cache = kmem_cache_create("posix_timers_cache", 3515cee9645SThomas Gleixner sizeof (struct k_itimer), 0, SLAB_PANIC, 3525cee9645SThomas Gleixner NULL); 3535cee9645SThomas Gleixner return 0; 3545cee9645SThomas Gleixner } 3555cee9645SThomas Gleixner 3565cee9645SThomas Gleixner __initcall(init_posix_timers); 3575cee9645SThomas Gleixner 3585cee9645SThomas Gleixner static void schedule_next_timer(struct k_itimer *timr) 3595cee9645SThomas Gleixner { 3605cee9645SThomas Gleixner struct hrtimer *timer = &timr->it.real.timer; 3615cee9645SThomas Gleixner 3622456e855SThomas Gleixner if (timr->it.real.interval == 0) 3635cee9645SThomas Gleixner return; 3645cee9645SThomas Gleixner 3655cee9645SThomas Gleixner timr->it_overrun += (unsigned int) hrtimer_forward(timer, 3665cee9645SThomas Gleixner timer->base->get_time(), 3675cee9645SThomas Gleixner timr->it.real.interval); 3685cee9645SThomas Gleixner 3695cee9645SThomas Gleixner timr->it_overrun_last = timr->it_overrun; 3705cee9645SThomas Gleixner timr->it_overrun = -1; 3715cee9645SThomas Gleixner ++timr->it_requeue_pending; 3725cee9645SThomas Gleixner hrtimer_restart(timer); 3735cee9645SThomas Gleixner } 3745cee9645SThomas Gleixner 3755cee9645SThomas Gleixner /* 3765cee9645SThomas Gleixner * This function is exported for use by the signal deliver code. It is 3775cee9645SThomas Gleixner * called just prior to the info block being released and passes that 3785cee9645SThomas Gleixner * block to us. It's function is to update the overrun entry AND to 3795cee9645SThomas Gleixner * restart the timer. It should only be called if the timer is to be 3805cee9645SThomas Gleixner * restarted (i.e. we have flagged this in the sys_private entry of the 3815cee9645SThomas Gleixner * info block). 3825cee9645SThomas Gleixner * 3835cee9645SThomas Gleixner * To protect against the timer going away while the interrupt is queued, 3845cee9645SThomas Gleixner * we require that the it_requeue_pending flag be set. 3855cee9645SThomas Gleixner */ 3865cee9645SThomas Gleixner void do_schedule_next_timer(struct siginfo *info) 3875cee9645SThomas Gleixner { 3885cee9645SThomas Gleixner struct k_itimer *timr; 3895cee9645SThomas Gleixner unsigned long flags; 3905cee9645SThomas Gleixner 3915cee9645SThomas Gleixner timr = lock_timer(info->si_tid, &flags); 3925cee9645SThomas Gleixner 3935cee9645SThomas Gleixner if (timr && timr->it_requeue_pending == info->si_sys_private) { 3945cee9645SThomas Gleixner if (timr->it_clock < 0) 3955cee9645SThomas Gleixner posix_cpu_timer_schedule(timr); 3965cee9645SThomas Gleixner else 3975cee9645SThomas Gleixner schedule_next_timer(timr); 3985cee9645SThomas Gleixner 3995cee9645SThomas Gleixner info->si_overrun += timr->it_overrun_last; 4005cee9645SThomas Gleixner } 4015cee9645SThomas Gleixner 4025cee9645SThomas Gleixner if (timr) 4035cee9645SThomas Gleixner unlock_timer(timr, flags); 4045cee9645SThomas Gleixner } 4055cee9645SThomas Gleixner 4065cee9645SThomas Gleixner int posix_timer_event(struct k_itimer *timr, int si_private) 4075cee9645SThomas Gleixner { 4085cee9645SThomas Gleixner struct task_struct *task; 4095cee9645SThomas Gleixner int shared, ret = -1; 4105cee9645SThomas Gleixner /* 4115cee9645SThomas Gleixner * FIXME: if ->sigq is queued we can race with 4125cee9645SThomas Gleixner * dequeue_signal()->do_schedule_next_timer(). 4135cee9645SThomas Gleixner * 4145cee9645SThomas Gleixner * If dequeue_signal() sees the "right" value of 4155cee9645SThomas Gleixner * si_sys_private it calls do_schedule_next_timer(). 4165cee9645SThomas Gleixner * We re-queue ->sigq and drop ->it_lock(). 4175cee9645SThomas Gleixner * do_schedule_next_timer() locks the timer 4185cee9645SThomas Gleixner * and re-schedules it while ->sigq is pending. 4195cee9645SThomas Gleixner * Not really bad, but not that we want. 4205cee9645SThomas Gleixner */ 4215cee9645SThomas Gleixner timr->sigq->info.si_sys_private = si_private; 4225cee9645SThomas Gleixner 4235cee9645SThomas Gleixner rcu_read_lock(); 4245cee9645SThomas Gleixner task = pid_task(timr->it_pid, PIDTYPE_PID); 4255cee9645SThomas Gleixner if (task) { 4265cee9645SThomas Gleixner shared = !(timr->it_sigev_notify & SIGEV_THREAD_ID); 4275cee9645SThomas Gleixner ret = send_sigqueue(timr->sigq, task, shared); 4285cee9645SThomas Gleixner } 4295cee9645SThomas Gleixner rcu_read_unlock(); 4305cee9645SThomas Gleixner /* If we failed to send the signal the timer stops. */ 4315cee9645SThomas Gleixner return ret > 0; 4325cee9645SThomas Gleixner } 4335cee9645SThomas Gleixner EXPORT_SYMBOL_GPL(posix_timer_event); 4345cee9645SThomas Gleixner 4355cee9645SThomas Gleixner /* 4365cee9645SThomas Gleixner * This function gets called when a POSIX.1b interval timer expires. It 4375cee9645SThomas Gleixner * is used as a callback from the kernel internal timer. The 4385cee9645SThomas Gleixner * run_timer_list code ALWAYS calls with interrupts on. 4395cee9645SThomas Gleixner 4405cee9645SThomas Gleixner * This code is for CLOCK_REALTIME* and CLOCK_MONOTONIC* timers. 4415cee9645SThomas Gleixner */ 4425cee9645SThomas Gleixner static enum hrtimer_restart posix_timer_fn(struct hrtimer *timer) 4435cee9645SThomas Gleixner { 4445cee9645SThomas Gleixner struct k_itimer *timr; 4455cee9645SThomas Gleixner unsigned long flags; 4465cee9645SThomas Gleixner int si_private = 0; 4475cee9645SThomas Gleixner enum hrtimer_restart ret = HRTIMER_NORESTART; 4485cee9645SThomas Gleixner 4495cee9645SThomas Gleixner timr = container_of(timer, struct k_itimer, it.real.timer); 4505cee9645SThomas Gleixner spin_lock_irqsave(&timr->it_lock, flags); 4515cee9645SThomas Gleixner 4522456e855SThomas Gleixner if (timr->it.real.interval != 0) 4535cee9645SThomas Gleixner si_private = ++timr->it_requeue_pending; 4545cee9645SThomas Gleixner 4555cee9645SThomas Gleixner if (posix_timer_event(timr, si_private)) { 4565cee9645SThomas Gleixner /* 4575cee9645SThomas Gleixner * signal was not sent because of sig_ignor 4585cee9645SThomas Gleixner * we will not get a call back to restart it AND 4595cee9645SThomas Gleixner * it should be restarted. 4605cee9645SThomas Gleixner */ 4612456e855SThomas Gleixner if (timr->it.real.interval != 0) { 4625cee9645SThomas Gleixner ktime_t now = hrtimer_cb_get_time(timer); 4635cee9645SThomas Gleixner 4645cee9645SThomas Gleixner /* 4655cee9645SThomas Gleixner * FIXME: What we really want, is to stop this 4665cee9645SThomas Gleixner * timer completely and restart it in case the 4675cee9645SThomas Gleixner * SIG_IGN is removed. This is a non trivial 4685cee9645SThomas Gleixner * change which involves sighand locking 4695cee9645SThomas Gleixner * (sigh !), which we don't want to do late in 4705cee9645SThomas Gleixner * the release cycle. 4715cee9645SThomas Gleixner * 4725cee9645SThomas Gleixner * For now we just let timers with an interval 4735cee9645SThomas Gleixner * less than a jiffie expire every jiffie to 4745cee9645SThomas Gleixner * avoid softirq starvation in case of SIG_IGN 4755cee9645SThomas Gleixner * and a very small interval, which would put 4765cee9645SThomas Gleixner * the timer right back on the softirq pending 4775cee9645SThomas Gleixner * list. By moving now ahead of time we trick 4785cee9645SThomas Gleixner * hrtimer_forward() to expire the timer 4795cee9645SThomas Gleixner * later, while we still maintain the overrun 4805cee9645SThomas Gleixner * accuracy, but have some inconsistency in 4815cee9645SThomas Gleixner * the timer_gettime() case. This is at least 4825cee9645SThomas Gleixner * better than a starved softirq. A more 4835cee9645SThomas Gleixner * complex fix which solves also another related 4845cee9645SThomas Gleixner * inconsistency is already in the pipeline. 4855cee9645SThomas Gleixner */ 4865cee9645SThomas Gleixner #ifdef CONFIG_HIGH_RES_TIMERS 4875cee9645SThomas Gleixner { 4885cee9645SThomas Gleixner ktime_t kj = ktime_set(0, NSEC_PER_SEC / HZ); 4895cee9645SThomas Gleixner 4902456e855SThomas Gleixner if (timr->it.real.interval < kj) 4915cee9645SThomas Gleixner now = ktime_add(now, kj); 4925cee9645SThomas Gleixner } 4935cee9645SThomas Gleixner #endif 4945cee9645SThomas Gleixner timr->it_overrun += (unsigned int) 4955cee9645SThomas Gleixner hrtimer_forward(timer, now, 4965cee9645SThomas Gleixner timr->it.real.interval); 4975cee9645SThomas Gleixner ret = HRTIMER_RESTART; 4985cee9645SThomas Gleixner ++timr->it_requeue_pending; 4995cee9645SThomas Gleixner } 5005cee9645SThomas Gleixner } 5015cee9645SThomas Gleixner 5025cee9645SThomas Gleixner unlock_timer(timr, flags); 5035cee9645SThomas Gleixner return ret; 5045cee9645SThomas Gleixner } 5055cee9645SThomas Gleixner 5065cee9645SThomas Gleixner static struct pid *good_sigevent(sigevent_t * event) 5075cee9645SThomas Gleixner { 5085cee9645SThomas Gleixner struct task_struct *rtn = current->group_leader; 5095cee9645SThomas Gleixner 5105cee9645SThomas Gleixner if ((event->sigev_notify & SIGEV_THREAD_ID ) && 5115cee9645SThomas Gleixner (!(rtn = find_task_by_vpid(event->sigev_notify_thread_id)) || 5125cee9645SThomas Gleixner !same_thread_group(rtn, current) || 5135cee9645SThomas Gleixner (event->sigev_notify & ~SIGEV_THREAD_ID) != SIGEV_SIGNAL)) 5145cee9645SThomas Gleixner return NULL; 5155cee9645SThomas Gleixner 5165cee9645SThomas Gleixner if (((event->sigev_notify & ~SIGEV_THREAD_ID) != SIGEV_NONE) && 5175cee9645SThomas Gleixner ((event->sigev_signo <= 0) || (event->sigev_signo > SIGRTMAX))) 5185cee9645SThomas Gleixner return NULL; 5195cee9645SThomas Gleixner 5205cee9645SThomas Gleixner return task_pid(rtn); 5215cee9645SThomas Gleixner } 5225cee9645SThomas Gleixner 5235cee9645SThomas Gleixner void posix_timers_register_clock(const clockid_t clock_id, 5245cee9645SThomas Gleixner struct k_clock *new_clock) 5255cee9645SThomas Gleixner { 5265cee9645SThomas Gleixner if ((unsigned) clock_id >= MAX_CLOCKS) { 5275cee9645SThomas Gleixner printk(KERN_WARNING "POSIX clock register failed for clock_id %d\n", 5285cee9645SThomas Gleixner clock_id); 5295cee9645SThomas Gleixner return; 5305cee9645SThomas Gleixner } 5315cee9645SThomas Gleixner 5325cee9645SThomas Gleixner if (!new_clock->clock_get) { 5335cee9645SThomas Gleixner printk(KERN_WARNING "POSIX clock id %d lacks clock_get()\n", 5345cee9645SThomas Gleixner clock_id); 5355cee9645SThomas Gleixner return; 5365cee9645SThomas Gleixner } 5375cee9645SThomas Gleixner if (!new_clock->clock_getres) { 5385cee9645SThomas Gleixner printk(KERN_WARNING "POSIX clock id %d lacks clock_getres()\n", 5395cee9645SThomas Gleixner clock_id); 5405cee9645SThomas Gleixner return; 5415cee9645SThomas Gleixner } 5425cee9645SThomas Gleixner 5435cee9645SThomas Gleixner posix_clocks[clock_id] = *new_clock; 5445cee9645SThomas Gleixner } 5455cee9645SThomas Gleixner EXPORT_SYMBOL_GPL(posix_timers_register_clock); 5465cee9645SThomas Gleixner 5475cee9645SThomas Gleixner static struct k_itimer * alloc_posix_timer(void) 5485cee9645SThomas Gleixner { 5495cee9645SThomas Gleixner struct k_itimer *tmr; 5505cee9645SThomas Gleixner tmr = kmem_cache_zalloc(posix_timers_cache, GFP_KERNEL); 5515cee9645SThomas Gleixner if (!tmr) 5525cee9645SThomas Gleixner return tmr; 5535cee9645SThomas Gleixner if (unlikely(!(tmr->sigq = sigqueue_alloc()))) { 5545cee9645SThomas Gleixner kmem_cache_free(posix_timers_cache, tmr); 5555cee9645SThomas Gleixner return NULL; 5565cee9645SThomas Gleixner } 5575cee9645SThomas Gleixner memset(&tmr->sigq->info, 0, sizeof(siginfo_t)); 5585cee9645SThomas Gleixner return tmr; 5595cee9645SThomas Gleixner } 5605cee9645SThomas Gleixner 5615cee9645SThomas Gleixner static void k_itimer_rcu_free(struct rcu_head *head) 5625cee9645SThomas Gleixner { 5635cee9645SThomas Gleixner struct k_itimer *tmr = container_of(head, struct k_itimer, it.rcu); 5645cee9645SThomas Gleixner 5655cee9645SThomas Gleixner kmem_cache_free(posix_timers_cache, tmr); 5665cee9645SThomas Gleixner } 5675cee9645SThomas Gleixner 5685cee9645SThomas Gleixner #define IT_ID_SET 1 5695cee9645SThomas Gleixner #define IT_ID_NOT_SET 0 5705cee9645SThomas Gleixner static void release_posix_timer(struct k_itimer *tmr, int it_id_set) 5715cee9645SThomas Gleixner { 5725cee9645SThomas Gleixner if (it_id_set) { 5735cee9645SThomas Gleixner unsigned long flags; 5745cee9645SThomas Gleixner spin_lock_irqsave(&hash_lock, flags); 5755cee9645SThomas Gleixner hlist_del_rcu(&tmr->t_hash); 5765cee9645SThomas Gleixner spin_unlock_irqrestore(&hash_lock, flags); 5775cee9645SThomas Gleixner } 5785cee9645SThomas Gleixner put_pid(tmr->it_pid); 5795cee9645SThomas Gleixner sigqueue_free(tmr->sigq); 5805cee9645SThomas Gleixner call_rcu(&tmr->it.rcu, k_itimer_rcu_free); 5815cee9645SThomas Gleixner } 5825cee9645SThomas Gleixner 5835cee9645SThomas Gleixner static struct k_clock *clockid_to_kclock(const clockid_t id) 5845cee9645SThomas Gleixner { 5855cee9645SThomas Gleixner if (id < 0) 5865cee9645SThomas Gleixner return (id & CLOCKFD_MASK) == CLOCKFD ? 5875cee9645SThomas Gleixner &clock_posix_dynamic : &clock_posix_cpu; 5885cee9645SThomas Gleixner 5895cee9645SThomas Gleixner if (id >= MAX_CLOCKS || !posix_clocks[id].clock_getres) 5905cee9645SThomas Gleixner return NULL; 5915cee9645SThomas Gleixner return &posix_clocks[id]; 5925cee9645SThomas Gleixner } 5935cee9645SThomas Gleixner 5945cee9645SThomas Gleixner static int common_timer_create(struct k_itimer *new_timer) 5955cee9645SThomas Gleixner { 5965cee9645SThomas Gleixner hrtimer_init(&new_timer->it.real.timer, new_timer->it_clock, 0); 5975cee9645SThomas Gleixner return 0; 5985cee9645SThomas Gleixner } 5995cee9645SThomas Gleixner 6005cee9645SThomas Gleixner /* Create a POSIX.1b interval timer. */ 6015cee9645SThomas Gleixner 6025cee9645SThomas Gleixner SYSCALL_DEFINE3(timer_create, const clockid_t, which_clock, 6035cee9645SThomas Gleixner struct sigevent __user *, timer_event_spec, 6045cee9645SThomas Gleixner timer_t __user *, created_timer_id) 6055cee9645SThomas Gleixner { 6065cee9645SThomas Gleixner struct k_clock *kc = clockid_to_kclock(which_clock); 6075cee9645SThomas Gleixner struct k_itimer *new_timer; 6085cee9645SThomas Gleixner int error, new_timer_id; 6095cee9645SThomas Gleixner sigevent_t event; 6105cee9645SThomas Gleixner int it_id_set = IT_ID_NOT_SET; 6115cee9645SThomas Gleixner 6125cee9645SThomas Gleixner if (!kc) 6135cee9645SThomas Gleixner return -EINVAL; 6145cee9645SThomas Gleixner if (!kc->timer_create) 6155cee9645SThomas Gleixner return -EOPNOTSUPP; 6165cee9645SThomas Gleixner 6175cee9645SThomas Gleixner new_timer = alloc_posix_timer(); 6185cee9645SThomas Gleixner if (unlikely(!new_timer)) 6195cee9645SThomas Gleixner return -EAGAIN; 6205cee9645SThomas Gleixner 6215cee9645SThomas Gleixner spin_lock_init(&new_timer->it_lock); 6225cee9645SThomas Gleixner new_timer_id = posix_timer_add(new_timer); 6235cee9645SThomas Gleixner if (new_timer_id < 0) { 6245cee9645SThomas Gleixner error = new_timer_id; 6255cee9645SThomas Gleixner goto out; 6265cee9645SThomas Gleixner } 6275cee9645SThomas Gleixner 6285cee9645SThomas Gleixner it_id_set = IT_ID_SET; 6295cee9645SThomas Gleixner new_timer->it_id = (timer_t) new_timer_id; 6305cee9645SThomas Gleixner new_timer->it_clock = which_clock; 6315cee9645SThomas Gleixner new_timer->it_overrun = -1; 6325cee9645SThomas Gleixner 6335cee9645SThomas Gleixner if (timer_event_spec) { 6345cee9645SThomas Gleixner if (copy_from_user(&event, timer_event_spec, sizeof (event))) { 6355cee9645SThomas Gleixner error = -EFAULT; 6365cee9645SThomas Gleixner goto out; 6375cee9645SThomas Gleixner } 6385cee9645SThomas Gleixner rcu_read_lock(); 6395cee9645SThomas Gleixner new_timer->it_pid = get_pid(good_sigevent(&event)); 6405cee9645SThomas Gleixner rcu_read_unlock(); 6415cee9645SThomas Gleixner if (!new_timer->it_pid) { 6425cee9645SThomas Gleixner error = -EINVAL; 6435cee9645SThomas Gleixner goto out; 6445cee9645SThomas Gleixner } 6455cee9645SThomas Gleixner } else { 6466891c450SMathias Krause memset(&event.sigev_value, 0, sizeof(event.sigev_value)); 6475cee9645SThomas Gleixner event.sigev_notify = SIGEV_SIGNAL; 6485cee9645SThomas Gleixner event.sigev_signo = SIGALRM; 6495cee9645SThomas Gleixner event.sigev_value.sival_int = new_timer->it_id; 6505cee9645SThomas Gleixner new_timer->it_pid = get_pid(task_tgid(current)); 6515cee9645SThomas Gleixner } 6525cee9645SThomas Gleixner 6535cee9645SThomas Gleixner new_timer->it_sigev_notify = event.sigev_notify; 6545cee9645SThomas Gleixner new_timer->sigq->info.si_signo = event.sigev_signo; 6555cee9645SThomas Gleixner new_timer->sigq->info.si_value = event.sigev_value; 6565cee9645SThomas Gleixner new_timer->sigq->info.si_tid = new_timer->it_id; 6575cee9645SThomas Gleixner new_timer->sigq->info.si_code = SI_TIMER; 6585cee9645SThomas Gleixner 6595cee9645SThomas Gleixner if (copy_to_user(created_timer_id, 6605cee9645SThomas Gleixner &new_timer_id, sizeof (new_timer_id))) { 6615cee9645SThomas Gleixner error = -EFAULT; 6625cee9645SThomas Gleixner goto out; 6635cee9645SThomas Gleixner } 6645cee9645SThomas Gleixner 6655cee9645SThomas Gleixner error = kc->timer_create(new_timer); 6665cee9645SThomas Gleixner if (error) 6675cee9645SThomas Gleixner goto out; 6685cee9645SThomas Gleixner 6695cee9645SThomas Gleixner spin_lock_irq(¤t->sighand->siglock); 6705cee9645SThomas Gleixner new_timer->it_signal = current->signal; 6715cee9645SThomas Gleixner list_add(&new_timer->list, ¤t->signal->posix_timers); 6725cee9645SThomas Gleixner spin_unlock_irq(¤t->sighand->siglock); 6735cee9645SThomas Gleixner 6745cee9645SThomas Gleixner return 0; 6755cee9645SThomas Gleixner /* 6765cee9645SThomas Gleixner * In the case of the timer belonging to another task, after 6775cee9645SThomas Gleixner * the task is unlocked, the timer is owned by the other task 6785cee9645SThomas Gleixner * and may cease to exist at any time. Don't use or modify 6795cee9645SThomas Gleixner * new_timer after the unlock call. 6805cee9645SThomas Gleixner */ 6815cee9645SThomas Gleixner out: 6825cee9645SThomas Gleixner release_posix_timer(new_timer, it_id_set); 6835cee9645SThomas Gleixner return error; 6845cee9645SThomas Gleixner } 6855cee9645SThomas Gleixner 6865cee9645SThomas Gleixner /* 6875cee9645SThomas Gleixner * Locking issues: We need to protect the result of the id look up until 6885cee9645SThomas Gleixner * we get the timer locked down so it is not deleted under us. The 6895cee9645SThomas Gleixner * removal is done under the idr spinlock so we use that here to bridge 6905cee9645SThomas Gleixner * the find to the timer lock. To avoid a dead lock, the timer id MUST 6915cee9645SThomas Gleixner * be release with out holding the timer lock. 6925cee9645SThomas Gleixner */ 6935cee9645SThomas Gleixner static struct k_itimer *__lock_timer(timer_t timer_id, unsigned long *flags) 6945cee9645SThomas Gleixner { 6955cee9645SThomas Gleixner struct k_itimer *timr; 6965cee9645SThomas Gleixner 6975cee9645SThomas Gleixner /* 6985cee9645SThomas Gleixner * timer_t could be any type >= int and we want to make sure any 6995cee9645SThomas Gleixner * @timer_id outside positive int range fails lookup. 7005cee9645SThomas Gleixner */ 7015cee9645SThomas Gleixner if ((unsigned long long)timer_id > INT_MAX) 7025cee9645SThomas Gleixner return NULL; 7035cee9645SThomas Gleixner 7045cee9645SThomas Gleixner rcu_read_lock(); 7055cee9645SThomas Gleixner timr = posix_timer_by_id(timer_id); 7065cee9645SThomas Gleixner if (timr) { 7075cee9645SThomas Gleixner spin_lock_irqsave(&timr->it_lock, *flags); 7085cee9645SThomas Gleixner if (timr->it_signal == current->signal) { 7095cee9645SThomas Gleixner rcu_read_unlock(); 7105cee9645SThomas Gleixner return timr; 7115cee9645SThomas Gleixner } 7125cee9645SThomas Gleixner spin_unlock_irqrestore(&timr->it_lock, *flags); 7135cee9645SThomas Gleixner } 7145cee9645SThomas Gleixner rcu_read_unlock(); 7155cee9645SThomas Gleixner 7165cee9645SThomas Gleixner return NULL; 7175cee9645SThomas Gleixner } 7185cee9645SThomas Gleixner 7195cee9645SThomas Gleixner /* 7205cee9645SThomas Gleixner * Get the time remaining on a POSIX.1b interval timer. This function 7215cee9645SThomas Gleixner * is ALWAYS called with spin_lock_irq on the timer, thus it must not 7225cee9645SThomas Gleixner * mess with irq. 7235cee9645SThomas Gleixner * 7245cee9645SThomas Gleixner * We have a couple of messes to clean up here. First there is the case 7255cee9645SThomas Gleixner * of a timer that has a requeue pending. These timers should appear to 7265cee9645SThomas Gleixner * be in the timer list with an expiry as if we were to requeue them 7275cee9645SThomas Gleixner * now. 7285cee9645SThomas Gleixner * 7295cee9645SThomas Gleixner * The second issue is the SIGEV_NONE timer which may be active but is 7305cee9645SThomas Gleixner * not really ever put in the timer list (to save system resources). 7315cee9645SThomas Gleixner * This timer may be expired, and if so, we will do it here. Otherwise 7325cee9645SThomas Gleixner * it is the same as a requeue pending timer WRT to what we should 7335cee9645SThomas Gleixner * report. 7345cee9645SThomas Gleixner */ 7355cee9645SThomas Gleixner static void 7365cee9645SThomas Gleixner common_timer_get(struct k_itimer *timr, struct itimerspec *cur_setting) 7375cee9645SThomas Gleixner { 7385cee9645SThomas Gleixner ktime_t now, remaining, iv; 7395cee9645SThomas Gleixner struct hrtimer *timer = &timr->it.real.timer; 7405cee9645SThomas Gleixner 7415cee9645SThomas Gleixner memset(cur_setting, 0, sizeof(struct itimerspec)); 7425cee9645SThomas Gleixner 7435cee9645SThomas Gleixner iv = timr->it.real.interval; 7445cee9645SThomas Gleixner 7455cee9645SThomas Gleixner /* interval timer ? */ 7462456e855SThomas Gleixner if (iv) 7475cee9645SThomas Gleixner cur_setting->it_interval = ktime_to_timespec(iv); 7485cee9645SThomas Gleixner else if (!hrtimer_active(timer) && 7495cee9645SThomas Gleixner (timr->it_sigev_notify & ~SIGEV_THREAD_ID) != SIGEV_NONE) 7505cee9645SThomas Gleixner return; 7515cee9645SThomas Gleixner 7525cee9645SThomas Gleixner now = timer->base->get_time(); 7535cee9645SThomas Gleixner 7545cee9645SThomas Gleixner /* 7555cee9645SThomas Gleixner * When a requeue is pending or this is a SIGEV_NONE 7565cee9645SThomas Gleixner * timer move the expiry time forward by intervals, so 7575cee9645SThomas Gleixner * expiry is > now. 7585cee9645SThomas Gleixner */ 7592456e855SThomas Gleixner if (iv && (timr->it_requeue_pending & REQUEUE_PENDING || 7605cee9645SThomas Gleixner (timr->it_sigev_notify & ~SIGEV_THREAD_ID) == SIGEV_NONE)) 7615cee9645SThomas Gleixner timr->it_overrun += (unsigned int) hrtimer_forward(timer, now, iv); 7625cee9645SThomas Gleixner 763572c3917SThomas Gleixner remaining = __hrtimer_expires_remaining_adjusted(timer, now); 7645cee9645SThomas Gleixner /* Return 0 only, when the timer is expired and not pending */ 7652456e855SThomas Gleixner if (remaining <= 0) { 7665cee9645SThomas Gleixner /* 7675cee9645SThomas Gleixner * A single shot SIGEV_NONE timer must return 0, when 7685cee9645SThomas Gleixner * it is expired ! 7695cee9645SThomas Gleixner */ 7705cee9645SThomas Gleixner if ((timr->it_sigev_notify & ~SIGEV_THREAD_ID) != SIGEV_NONE) 7715cee9645SThomas Gleixner cur_setting->it_value.tv_nsec = 1; 7725cee9645SThomas Gleixner } else 7735cee9645SThomas Gleixner cur_setting->it_value = ktime_to_timespec(remaining); 7745cee9645SThomas Gleixner } 7755cee9645SThomas Gleixner 7765cee9645SThomas Gleixner /* Get the time remaining on a POSIX.1b interval timer. */ 7775cee9645SThomas Gleixner SYSCALL_DEFINE2(timer_gettime, timer_t, timer_id, 7785cee9645SThomas Gleixner struct itimerspec __user *, setting) 7795cee9645SThomas Gleixner { 7805cee9645SThomas Gleixner struct itimerspec cur_setting; 7815cee9645SThomas Gleixner struct k_itimer *timr; 7825cee9645SThomas Gleixner struct k_clock *kc; 7835cee9645SThomas Gleixner unsigned long flags; 7845cee9645SThomas Gleixner int ret = 0; 7855cee9645SThomas Gleixner 7865cee9645SThomas Gleixner timr = lock_timer(timer_id, &flags); 7875cee9645SThomas Gleixner if (!timr) 7885cee9645SThomas Gleixner return -EINVAL; 7895cee9645SThomas Gleixner 7905cee9645SThomas Gleixner kc = clockid_to_kclock(timr->it_clock); 7915cee9645SThomas Gleixner if (WARN_ON_ONCE(!kc || !kc->timer_get)) 7925cee9645SThomas Gleixner ret = -EINVAL; 7935cee9645SThomas Gleixner else 7945cee9645SThomas Gleixner kc->timer_get(timr, &cur_setting); 7955cee9645SThomas Gleixner 7965cee9645SThomas Gleixner unlock_timer(timr, flags); 7975cee9645SThomas Gleixner 7985cee9645SThomas Gleixner if (!ret && copy_to_user(setting, &cur_setting, sizeof (cur_setting))) 7995cee9645SThomas Gleixner return -EFAULT; 8005cee9645SThomas Gleixner 8015cee9645SThomas Gleixner return ret; 8025cee9645SThomas Gleixner } 8035cee9645SThomas Gleixner 8045cee9645SThomas Gleixner /* 8055cee9645SThomas Gleixner * Get the number of overruns of a POSIX.1b interval timer. This is to 8065cee9645SThomas Gleixner * be the overrun of the timer last delivered. At the same time we are 8075cee9645SThomas Gleixner * accumulating overruns on the next timer. The overrun is frozen when 8085cee9645SThomas Gleixner * the signal is delivered, either at the notify time (if the info block 8095cee9645SThomas Gleixner * is not queued) or at the actual delivery time (as we are informed by 8105cee9645SThomas Gleixner * the call back to do_schedule_next_timer(). So all we need to do is 8115cee9645SThomas Gleixner * to pick up the frozen overrun. 8125cee9645SThomas Gleixner */ 8135cee9645SThomas Gleixner SYSCALL_DEFINE1(timer_getoverrun, timer_t, timer_id) 8145cee9645SThomas Gleixner { 8155cee9645SThomas Gleixner struct k_itimer *timr; 8165cee9645SThomas Gleixner int overrun; 8175cee9645SThomas Gleixner unsigned long flags; 8185cee9645SThomas Gleixner 8195cee9645SThomas Gleixner timr = lock_timer(timer_id, &flags); 8205cee9645SThomas Gleixner if (!timr) 8215cee9645SThomas Gleixner return -EINVAL; 8225cee9645SThomas Gleixner 8235cee9645SThomas Gleixner overrun = timr->it_overrun_last; 8245cee9645SThomas Gleixner unlock_timer(timr, flags); 8255cee9645SThomas Gleixner 8265cee9645SThomas Gleixner return overrun; 8275cee9645SThomas Gleixner } 8285cee9645SThomas Gleixner 8295cee9645SThomas Gleixner /* Set a POSIX.1b interval timer. */ 8305cee9645SThomas Gleixner /* timr->it_lock is taken. */ 8315cee9645SThomas Gleixner static int 8325cee9645SThomas Gleixner common_timer_set(struct k_itimer *timr, int flags, 8335cee9645SThomas Gleixner struct itimerspec *new_setting, struct itimerspec *old_setting) 8345cee9645SThomas Gleixner { 8355cee9645SThomas Gleixner struct hrtimer *timer = &timr->it.real.timer; 8365cee9645SThomas Gleixner enum hrtimer_mode mode; 8375cee9645SThomas Gleixner 8385cee9645SThomas Gleixner if (old_setting) 8395cee9645SThomas Gleixner common_timer_get(timr, old_setting); 8405cee9645SThomas Gleixner 8415cee9645SThomas Gleixner /* disable the timer */ 8422456e855SThomas Gleixner timr->it.real.interval = 0; 8435cee9645SThomas Gleixner /* 8445cee9645SThomas Gleixner * careful here. If smp we could be in the "fire" routine which will 8455cee9645SThomas Gleixner * be spinning as we hold the lock. But this is ONLY an SMP issue. 8465cee9645SThomas Gleixner */ 8475cee9645SThomas Gleixner if (hrtimer_try_to_cancel(timer) < 0) 8485cee9645SThomas Gleixner return TIMER_RETRY; 8495cee9645SThomas Gleixner 8505cee9645SThomas Gleixner timr->it_requeue_pending = (timr->it_requeue_pending + 2) & 8515cee9645SThomas Gleixner ~REQUEUE_PENDING; 8525cee9645SThomas Gleixner timr->it_overrun_last = 0; 8535cee9645SThomas Gleixner 8545cee9645SThomas Gleixner /* switch off the timer when it_value is zero */ 8555cee9645SThomas Gleixner if (!new_setting->it_value.tv_sec && !new_setting->it_value.tv_nsec) 8565cee9645SThomas Gleixner return 0; 8575cee9645SThomas Gleixner 8585cee9645SThomas Gleixner mode = flags & TIMER_ABSTIME ? HRTIMER_MODE_ABS : HRTIMER_MODE_REL; 8595cee9645SThomas Gleixner hrtimer_init(&timr->it.real.timer, timr->it_clock, mode); 8605cee9645SThomas Gleixner timr->it.real.timer.function = posix_timer_fn; 8615cee9645SThomas Gleixner 8625cee9645SThomas Gleixner hrtimer_set_expires(timer, timespec_to_ktime(new_setting->it_value)); 8635cee9645SThomas Gleixner 8645cee9645SThomas Gleixner /* Convert interval */ 8655cee9645SThomas Gleixner timr->it.real.interval = timespec_to_ktime(new_setting->it_interval); 8665cee9645SThomas Gleixner 8675cee9645SThomas Gleixner /* SIGEV_NONE timers are not queued ! See common_timer_get */ 8685cee9645SThomas Gleixner if (((timr->it_sigev_notify & ~SIGEV_THREAD_ID) == SIGEV_NONE)) { 8695cee9645SThomas Gleixner /* Setup correct expiry time for relative timers */ 8705cee9645SThomas Gleixner if (mode == HRTIMER_MODE_REL) { 8715cee9645SThomas Gleixner hrtimer_add_expires(timer, timer->base->get_time()); 8725cee9645SThomas Gleixner } 8735cee9645SThomas Gleixner return 0; 8745cee9645SThomas Gleixner } 8755cee9645SThomas Gleixner 8765cee9645SThomas Gleixner hrtimer_start_expires(timer, mode); 8775cee9645SThomas Gleixner return 0; 8785cee9645SThomas Gleixner } 8795cee9645SThomas Gleixner 8805cee9645SThomas Gleixner /* Set a POSIX.1b interval timer */ 8815cee9645SThomas Gleixner SYSCALL_DEFINE4(timer_settime, timer_t, timer_id, int, flags, 8825cee9645SThomas Gleixner const struct itimerspec __user *, new_setting, 8835cee9645SThomas Gleixner struct itimerspec __user *, old_setting) 8845cee9645SThomas Gleixner { 8855cee9645SThomas Gleixner struct k_itimer *timr; 8865cee9645SThomas Gleixner struct itimerspec new_spec, old_spec; 8875cee9645SThomas Gleixner int error = 0; 8885cee9645SThomas Gleixner unsigned long flag; 8895cee9645SThomas Gleixner struct itimerspec *rtn = old_setting ? &old_spec : NULL; 8905cee9645SThomas Gleixner struct k_clock *kc; 8915cee9645SThomas Gleixner 8925cee9645SThomas Gleixner if (!new_setting) 8935cee9645SThomas Gleixner return -EINVAL; 8945cee9645SThomas Gleixner 8955cee9645SThomas Gleixner if (copy_from_user(&new_spec, new_setting, sizeof (new_spec))) 8965cee9645SThomas Gleixner return -EFAULT; 8975cee9645SThomas Gleixner 8985cee9645SThomas Gleixner if (!timespec_valid(&new_spec.it_interval) || 8995cee9645SThomas Gleixner !timespec_valid(&new_spec.it_value)) 9005cee9645SThomas Gleixner return -EINVAL; 9015cee9645SThomas Gleixner retry: 9025cee9645SThomas Gleixner timr = lock_timer(timer_id, &flag); 9035cee9645SThomas Gleixner if (!timr) 9045cee9645SThomas Gleixner return -EINVAL; 9055cee9645SThomas Gleixner 9065cee9645SThomas Gleixner kc = clockid_to_kclock(timr->it_clock); 9075cee9645SThomas Gleixner if (WARN_ON_ONCE(!kc || !kc->timer_set)) 9085cee9645SThomas Gleixner error = -EINVAL; 9095cee9645SThomas Gleixner else 9105cee9645SThomas Gleixner error = kc->timer_set(timr, flags, &new_spec, rtn); 9115cee9645SThomas Gleixner 9125cee9645SThomas Gleixner unlock_timer(timr, flag); 9135cee9645SThomas Gleixner if (error == TIMER_RETRY) { 9145cee9645SThomas Gleixner rtn = NULL; // We already got the old time... 9155cee9645SThomas Gleixner goto retry; 9165cee9645SThomas Gleixner } 9175cee9645SThomas Gleixner 9185cee9645SThomas Gleixner if (old_setting && !error && 9195cee9645SThomas Gleixner copy_to_user(old_setting, &old_spec, sizeof (old_spec))) 9205cee9645SThomas Gleixner error = -EFAULT; 9215cee9645SThomas Gleixner 9225cee9645SThomas Gleixner return error; 9235cee9645SThomas Gleixner } 9245cee9645SThomas Gleixner 9255cee9645SThomas Gleixner static int common_timer_del(struct k_itimer *timer) 9265cee9645SThomas Gleixner { 9272456e855SThomas Gleixner timer->it.real.interval = 0; 9285cee9645SThomas Gleixner 9295cee9645SThomas Gleixner if (hrtimer_try_to_cancel(&timer->it.real.timer) < 0) 9305cee9645SThomas Gleixner return TIMER_RETRY; 9315cee9645SThomas Gleixner return 0; 9325cee9645SThomas Gleixner } 9335cee9645SThomas Gleixner 9345cee9645SThomas Gleixner static inline int timer_delete_hook(struct k_itimer *timer) 9355cee9645SThomas Gleixner { 9365cee9645SThomas Gleixner struct k_clock *kc = clockid_to_kclock(timer->it_clock); 9375cee9645SThomas Gleixner 9385cee9645SThomas Gleixner if (WARN_ON_ONCE(!kc || !kc->timer_del)) 9395cee9645SThomas Gleixner return -EINVAL; 9405cee9645SThomas Gleixner return kc->timer_del(timer); 9415cee9645SThomas Gleixner } 9425cee9645SThomas Gleixner 9435cee9645SThomas Gleixner /* Delete a POSIX.1b interval timer. */ 9445cee9645SThomas Gleixner SYSCALL_DEFINE1(timer_delete, timer_t, timer_id) 9455cee9645SThomas Gleixner { 9465cee9645SThomas Gleixner struct k_itimer *timer; 9475cee9645SThomas Gleixner unsigned long flags; 9485cee9645SThomas Gleixner 9495cee9645SThomas Gleixner retry_delete: 9505cee9645SThomas Gleixner timer = lock_timer(timer_id, &flags); 9515cee9645SThomas Gleixner if (!timer) 9525cee9645SThomas Gleixner return -EINVAL; 9535cee9645SThomas Gleixner 9545cee9645SThomas Gleixner if (timer_delete_hook(timer) == TIMER_RETRY) { 9555cee9645SThomas Gleixner unlock_timer(timer, flags); 9565cee9645SThomas Gleixner goto retry_delete; 9575cee9645SThomas Gleixner } 9585cee9645SThomas Gleixner 9595cee9645SThomas Gleixner spin_lock(¤t->sighand->siglock); 9605cee9645SThomas Gleixner list_del(&timer->list); 9615cee9645SThomas Gleixner spin_unlock(¤t->sighand->siglock); 9625cee9645SThomas Gleixner /* 9635cee9645SThomas Gleixner * This keeps any tasks waiting on the spin lock from thinking 9645cee9645SThomas Gleixner * they got something (see the lock code above). 9655cee9645SThomas Gleixner */ 9665cee9645SThomas Gleixner timer->it_signal = NULL; 9675cee9645SThomas Gleixner 9685cee9645SThomas Gleixner unlock_timer(timer, flags); 9695cee9645SThomas Gleixner release_posix_timer(timer, IT_ID_SET); 9705cee9645SThomas Gleixner return 0; 9715cee9645SThomas Gleixner } 9725cee9645SThomas Gleixner 9735cee9645SThomas Gleixner /* 9745cee9645SThomas Gleixner * return timer owned by the process, used by exit_itimers 9755cee9645SThomas Gleixner */ 9765cee9645SThomas Gleixner static void itimer_delete(struct k_itimer *timer) 9775cee9645SThomas Gleixner { 9785cee9645SThomas Gleixner unsigned long flags; 9795cee9645SThomas Gleixner 9805cee9645SThomas Gleixner retry_delete: 9815cee9645SThomas Gleixner spin_lock_irqsave(&timer->it_lock, flags); 9825cee9645SThomas Gleixner 9835cee9645SThomas Gleixner if (timer_delete_hook(timer) == TIMER_RETRY) { 9845cee9645SThomas Gleixner unlock_timer(timer, flags); 9855cee9645SThomas Gleixner goto retry_delete; 9865cee9645SThomas Gleixner } 9875cee9645SThomas Gleixner list_del(&timer->list); 9885cee9645SThomas Gleixner /* 9895cee9645SThomas Gleixner * This keeps any tasks waiting on the spin lock from thinking 9905cee9645SThomas Gleixner * they got something (see the lock code above). 9915cee9645SThomas Gleixner */ 9925cee9645SThomas Gleixner timer->it_signal = NULL; 9935cee9645SThomas Gleixner 9945cee9645SThomas Gleixner unlock_timer(timer, flags); 9955cee9645SThomas Gleixner release_posix_timer(timer, IT_ID_SET); 9965cee9645SThomas Gleixner } 9975cee9645SThomas Gleixner 9985cee9645SThomas Gleixner /* 9995cee9645SThomas Gleixner * This is called by do_exit or de_thread, only when there are no more 10005cee9645SThomas Gleixner * references to the shared signal_struct. 10015cee9645SThomas Gleixner */ 10025cee9645SThomas Gleixner void exit_itimers(struct signal_struct *sig) 10035cee9645SThomas Gleixner { 10045cee9645SThomas Gleixner struct k_itimer *tmr; 10055cee9645SThomas Gleixner 10065cee9645SThomas Gleixner while (!list_empty(&sig->posix_timers)) { 10075cee9645SThomas Gleixner tmr = list_entry(sig->posix_timers.next, struct k_itimer, list); 10085cee9645SThomas Gleixner itimer_delete(tmr); 10095cee9645SThomas Gleixner } 10105cee9645SThomas Gleixner } 10115cee9645SThomas Gleixner 10125cee9645SThomas Gleixner SYSCALL_DEFINE2(clock_settime, const clockid_t, which_clock, 10135cee9645SThomas Gleixner const struct timespec __user *, tp) 10145cee9645SThomas Gleixner { 10155cee9645SThomas Gleixner struct k_clock *kc = clockid_to_kclock(which_clock); 10165cee9645SThomas Gleixner struct timespec new_tp; 10175cee9645SThomas Gleixner 10185cee9645SThomas Gleixner if (!kc || !kc->clock_set) 10195cee9645SThomas Gleixner return -EINVAL; 10205cee9645SThomas Gleixner 10215cee9645SThomas Gleixner if (copy_from_user(&new_tp, tp, sizeof (*tp))) 10225cee9645SThomas Gleixner return -EFAULT; 10235cee9645SThomas Gleixner 10245cee9645SThomas Gleixner return kc->clock_set(which_clock, &new_tp); 10255cee9645SThomas Gleixner } 10265cee9645SThomas Gleixner 10275cee9645SThomas Gleixner SYSCALL_DEFINE2(clock_gettime, const clockid_t, which_clock, 10285cee9645SThomas Gleixner struct timespec __user *,tp) 10295cee9645SThomas Gleixner { 10305cee9645SThomas Gleixner struct k_clock *kc = clockid_to_kclock(which_clock); 10315cee9645SThomas Gleixner struct timespec kernel_tp; 10325cee9645SThomas Gleixner int error; 10335cee9645SThomas Gleixner 10345cee9645SThomas Gleixner if (!kc) 10355cee9645SThomas Gleixner return -EINVAL; 10365cee9645SThomas Gleixner 10375cee9645SThomas Gleixner error = kc->clock_get(which_clock, &kernel_tp); 10385cee9645SThomas Gleixner 10395cee9645SThomas Gleixner if (!error && copy_to_user(tp, &kernel_tp, sizeof (kernel_tp))) 10405cee9645SThomas Gleixner error = -EFAULT; 10415cee9645SThomas Gleixner 10425cee9645SThomas Gleixner return error; 10435cee9645SThomas Gleixner } 10445cee9645SThomas Gleixner 10455cee9645SThomas Gleixner SYSCALL_DEFINE2(clock_adjtime, const clockid_t, which_clock, 10465cee9645SThomas Gleixner struct timex __user *, utx) 10475cee9645SThomas Gleixner { 10485cee9645SThomas Gleixner struct k_clock *kc = clockid_to_kclock(which_clock); 10495cee9645SThomas Gleixner struct timex ktx; 10505cee9645SThomas Gleixner int err; 10515cee9645SThomas Gleixner 10525cee9645SThomas Gleixner if (!kc) 10535cee9645SThomas Gleixner return -EINVAL; 10545cee9645SThomas Gleixner if (!kc->clock_adj) 10555cee9645SThomas Gleixner return -EOPNOTSUPP; 10565cee9645SThomas Gleixner 10575cee9645SThomas Gleixner if (copy_from_user(&ktx, utx, sizeof(ktx))) 10585cee9645SThomas Gleixner return -EFAULT; 10595cee9645SThomas Gleixner 10605cee9645SThomas Gleixner err = kc->clock_adj(which_clock, &ktx); 10615cee9645SThomas Gleixner 10625cee9645SThomas Gleixner if (err >= 0 && copy_to_user(utx, &ktx, sizeof(ktx))) 10635cee9645SThomas Gleixner return -EFAULT; 10645cee9645SThomas Gleixner 10655cee9645SThomas Gleixner return err; 10665cee9645SThomas Gleixner } 10675cee9645SThomas Gleixner 10685cee9645SThomas Gleixner SYSCALL_DEFINE2(clock_getres, const clockid_t, which_clock, 10695cee9645SThomas Gleixner struct timespec __user *, tp) 10705cee9645SThomas Gleixner { 10715cee9645SThomas Gleixner struct k_clock *kc = clockid_to_kclock(which_clock); 10725cee9645SThomas Gleixner struct timespec rtn_tp; 10735cee9645SThomas Gleixner int error; 10745cee9645SThomas Gleixner 10755cee9645SThomas Gleixner if (!kc) 10765cee9645SThomas Gleixner return -EINVAL; 10775cee9645SThomas Gleixner 10785cee9645SThomas Gleixner error = kc->clock_getres(which_clock, &rtn_tp); 10795cee9645SThomas Gleixner 10805cee9645SThomas Gleixner if (!error && tp && copy_to_user(tp, &rtn_tp, sizeof (rtn_tp))) 10815cee9645SThomas Gleixner error = -EFAULT; 10825cee9645SThomas Gleixner 10835cee9645SThomas Gleixner return error; 10845cee9645SThomas Gleixner } 10855cee9645SThomas Gleixner 10865cee9645SThomas Gleixner /* 10875cee9645SThomas Gleixner * nanosleep for monotonic and realtime clocks 10885cee9645SThomas Gleixner */ 10895cee9645SThomas Gleixner static int common_nsleep(const clockid_t which_clock, int flags, 10905cee9645SThomas Gleixner struct timespec *tsave, struct timespec __user *rmtp) 10915cee9645SThomas Gleixner { 10925cee9645SThomas Gleixner return hrtimer_nanosleep(tsave, rmtp, flags & TIMER_ABSTIME ? 10935cee9645SThomas Gleixner HRTIMER_MODE_ABS : HRTIMER_MODE_REL, 10945cee9645SThomas Gleixner which_clock); 10955cee9645SThomas Gleixner } 10965cee9645SThomas Gleixner 10975cee9645SThomas Gleixner SYSCALL_DEFINE4(clock_nanosleep, const clockid_t, which_clock, int, flags, 10985cee9645SThomas Gleixner const struct timespec __user *, rqtp, 10995cee9645SThomas Gleixner struct timespec __user *, rmtp) 11005cee9645SThomas Gleixner { 11015cee9645SThomas Gleixner struct k_clock *kc = clockid_to_kclock(which_clock); 11025cee9645SThomas Gleixner struct timespec t; 11035cee9645SThomas Gleixner 11045cee9645SThomas Gleixner if (!kc) 11055cee9645SThomas Gleixner return -EINVAL; 11065cee9645SThomas Gleixner if (!kc->nsleep) 11075cee9645SThomas Gleixner return -ENANOSLEEP_NOTSUP; 11085cee9645SThomas Gleixner 11095cee9645SThomas Gleixner if (copy_from_user(&t, rqtp, sizeof (struct timespec))) 11105cee9645SThomas Gleixner return -EFAULT; 11115cee9645SThomas Gleixner 11125cee9645SThomas Gleixner if (!timespec_valid(&t)) 11135cee9645SThomas Gleixner return -EINVAL; 11145cee9645SThomas Gleixner 11155cee9645SThomas Gleixner return kc->nsleep(which_clock, flags, &t, rmtp); 11165cee9645SThomas Gleixner } 11175cee9645SThomas Gleixner 11185cee9645SThomas Gleixner /* 11195cee9645SThomas Gleixner * This will restart clock_nanosleep. This is required only by 11205cee9645SThomas Gleixner * compat_clock_nanosleep_restart for now. 11215cee9645SThomas Gleixner */ 11225cee9645SThomas Gleixner long clock_nanosleep_restart(struct restart_block *restart_block) 11235cee9645SThomas Gleixner { 11245cee9645SThomas Gleixner clockid_t which_clock = restart_block->nanosleep.clockid; 11255cee9645SThomas Gleixner struct k_clock *kc = clockid_to_kclock(which_clock); 11265cee9645SThomas Gleixner 11275cee9645SThomas Gleixner if (WARN_ON_ONCE(!kc || !kc->nsleep_restart)) 11285cee9645SThomas Gleixner return -EINVAL; 11295cee9645SThomas Gleixner 11305cee9645SThomas Gleixner return kc->nsleep_restart(restart_block); 11315cee9645SThomas Gleixner } 1132