Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
Uwe Zeisberger | f30c226 | 2006-10-03 23:01:26 +0200 | [diff] [blame] | 2 | * linux/kernel/posix-timers.c |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3 | * |
| 4 | * |
| 5 | * 2002-10-15 Posix Clocks & timers |
| 6 | * by George Anzinger george@mvista.com |
| 7 | * |
| 8 | * Copyright (C) 2002 2003 by MontaVista Software. |
| 9 | * |
| 10 | * 2004-06-01 Fix CLOCK_REALTIME clock/timer TIMER_ABSTIME bug. |
| 11 | * Copyright (C) 2004 Boris Hu |
| 12 | * |
| 13 | * This program is free software; you can redistribute it and/or modify |
| 14 | * it under the terms of the GNU General Public License as published by |
| 15 | * the Free Software Foundation; either version 2 of the License, or (at |
| 16 | * your option) any later version. |
| 17 | * |
| 18 | * This program is distributed in the hope that it will be useful, but |
| 19 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
| 20 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 21 | * General Public License for more details. |
| 22 | |
| 23 | * You should have received a copy of the GNU General Public License |
| 24 | * along with this program; if not, write to the Free Software |
| 25 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
| 26 | * |
| 27 | * MontaVista Software | 1237 East Arques Avenue | Sunnyvale | CA 94085 | USA |
| 28 | */ |
| 29 | |
| 30 | /* These are all the functions necessary to implement |
| 31 | * POSIX clocks & timers |
| 32 | */ |
| 33 | #include <linux/mm.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 34 | #include <linux/interrupt.h> |
| 35 | #include <linux/slab.h> |
| 36 | #include <linux/time.h> |
Arjan van de Ven | 97d1f15 | 2006-03-23 03:00:24 -0800 | [diff] [blame] | 37 | #include <linux/mutex.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 38 | |
| 39 | #include <asm/uaccess.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 40 | #include <linux/list.h> |
| 41 | #include <linux/init.h> |
| 42 | #include <linux/compiler.h> |
| 43 | #include <linux/idr.h> |
| 44 | #include <linux/posix-timers.h> |
| 45 | #include <linux/syscalls.h> |
| 46 | #include <linux/wait.h> |
| 47 | #include <linux/workqueue.h> |
| 48 | #include <linux/module.h> |
| 49 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 50 | /* |
| 51 | * Management arrays for POSIX timers. Timers are kept in slab memory |
| 52 | * Timer ids are allocated by an external routine that keeps track of the |
| 53 | * id and the timer. The external interface is: |
| 54 | * |
| 55 | * void *idr_find(struct idr *idp, int id); to find timer_id <id> |
| 56 | * int idr_get_new(struct idr *idp, void *ptr); to get a new id and |
| 57 | * related it to <ptr> |
| 58 | * void idr_remove(struct idr *idp, int id); to release <id> |
| 59 | * void idr_init(struct idr *idp); to initialize <idp> |
| 60 | * which we supply. |
| 61 | * The idr_get_new *may* call slab for more memory so it must not be |
| 62 | * called under a spin lock. Likewise idr_remore may release memory |
| 63 | * (but it may be ok to do this under a lock...). |
| 64 | * idr_find is just a memory look up and is quite fast. A -1 return |
| 65 | * indicates that the requested id does not exist. |
| 66 | */ |
| 67 | |
| 68 | /* |
| 69 | * Lets keep our timers in a slab cache :-) |
| 70 | */ |
Christoph Lameter | e18b890 | 2006-12-06 20:33:20 -0800 | [diff] [blame] | 71 | static struct kmem_cache *posix_timers_cache; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 72 | static struct idr posix_timers_id; |
| 73 | static DEFINE_SPINLOCK(idr_lock); |
| 74 | |
| 75 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 76 | * we assume that the new SIGEV_THREAD_ID shares no bits with the other |
| 77 | * SIGEV values. Here we put out an error if this assumption fails. |
| 78 | */ |
| 79 | #if SIGEV_THREAD_ID != (SIGEV_THREAD_ID & \ |
| 80 | ~(SIGEV_SIGNAL | SIGEV_NONE | SIGEV_THREAD)) |
| 81 | #error "SIGEV_THREAD_ID must not share bit with other SIGEV values!" |
| 82 | #endif |
| 83 | |
Thomas Gleixner | 65da528 | 2011-02-01 13:51:01 +0000 | [diff] [blame] | 84 | /* |
| 85 | * parisc wants ENOTSUP instead of EOPNOTSUPP |
| 86 | */ |
| 87 | #ifndef ENOTSUP |
| 88 | # define ENANOSLEEP_NOTSUP EOPNOTSUPP |
| 89 | #else |
| 90 | # define ENANOSLEEP_NOTSUP ENOTSUP |
| 91 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 92 | |
| 93 | /* |
| 94 | * The timer ID is turned into a timer address by idr_find(). |
| 95 | * Verifying a valid ID consists of: |
| 96 | * |
| 97 | * a) checking that idr_find() returns other than -1. |
| 98 | * b) checking that the timer id matches the one in the timer itself. |
| 99 | * c) that the timer owner is in the callers thread group. |
| 100 | */ |
| 101 | |
| 102 | /* |
| 103 | * CLOCKs: The POSIX standard calls for a couple of clocks and allows us |
| 104 | * to implement others. This structure defines the various |
Richard Cochran | 0061748 | 2011-02-01 13:52:15 +0000 | [diff] [blame^] | 105 | * clocks. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 106 | * |
| 107 | * RESOLUTION: Clock resolution is used to round up timer and interval |
| 108 | * times, NOT to report clock times, which are reported with as |
| 109 | * much resolution as the system can muster. In some cases this |
| 110 | * resolution may depend on the underlying clock hardware and |
| 111 | * may not be quantifiable until run time, and only then is the |
| 112 | * necessary code is written. The standard says we should say |
| 113 | * something about this issue in the documentation... |
| 114 | * |
Richard Cochran | 0061748 | 2011-02-01 13:52:15 +0000 | [diff] [blame^] | 115 | * FUNCTIONS: The CLOCKs structure defines possible functions to |
| 116 | * handle various clock functions. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 117 | * |
Richard Cochran | 0061748 | 2011-02-01 13:52:15 +0000 | [diff] [blame^] | 118 | * The standard POSIX timer management code assumes the |
| 119 | * following: 1.) The k_itimer struct (sched.h) is used for |
| 120 | * the timer. 2.) The list, it_lock, it_clock, it_id and |
| 121 | * it_pid fields are not modified by timer code. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 122 | * |
| 123 | * Permissions: It is assumed that the clock_settime() function defined |
| 124 | * for each clock will take care of permission checks. Some |
| 125 | * clocks may be set able by any user (i.e. local process |
| 126 | * clocks) others not. Currently the only set able clock we |
| 127 | * have is CLOCK_REALTIME and its high res counter part, both of |
| 128 | * which we beg off on and pass to do_sys_settimeofday(). |
| 129 | */ |
| 130 | |
| 131 | static struct k_clock posix_clocks[MAX_CLOCKS]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 132 | |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 133 | /* |
| 134 | * These ones are defined below. |
| 135 | */ |
| 136 | static int common_nsleep(const clockid_t, int flags, struct timespec *t, |
| 137 | struct timespec __user *rmtp); |
Thomas Gleixner | 838394f | 2011-02-01 13:51:58 +0000 | [diff] [blame] | 138 | static int common_timer_create(struct k_itimer *new_timer); |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 139 | static void common_timer_get(struct k_itimer *, struct itimerspec *); |
| 140 | static int common_timer_set(struct k_itimer *, int, |
| 141 | struct itimerspec *, struct itimerspec *); |
| 142 | static int common_timer_del(struct k_itimer *timer); |
| 143 | |
Thomas Gleixner | c9cb2e3 | 2007-02-16 01:27:49 -0800 | [diff] [blame] | 144 | static enum hrtimer_restart posix_timer_fn(struct hrtimer *data); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 145 | |
Namhyung Kim | 20f33a0 | 2010-10-20 15:57:34 -0700 | [diff] [blame] | 146 | static struct k_itimer *__lock_timer(timer_t timer_id, unsigned long *flags); |
| 147 | |
| 148 | #define lock_timer(tid, flags) \ |
| 149 | ({ struct k_itimer *__timr; \ |
| 150 | __cond_lock(&__timr->it_lock, __timr = __lock_timer(tid, flags)); \ |
| 151 | __timr; \ |
| 152 | }) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 153 | |
| 154 | static inline void unlock_timer(struct k_itimer *timr, unsigned long flags) |
| 155 | { |
| 156 | spin_unlock_irqrestore(&timr->it_lock, flags); |
| 157 | } |
| 158 | |
Thomas Gleixner | 4228577 | 2011-02-01 13:51:50 +0000 | [diff] [blame] | 159 | /* Get clock_realtime */ |
| 160 | static int posix_clock_realtime_get(clockid_t which_clock, struct timespec *tp) |
| 161 | { |
| 162 | ktime_get_real_ts(tp); |
| 163 | return 0; |
| 164 | } |
| 165 | |
Thomas Gleixner | 26f9a47 | 2011-02-01 13:51:48 +0000 | [diff] [blame] | 166 | /* Set clock_realtime */ |
| 167 | static int posix_clock_realtime_set(const clockid_t which_clock, |
| 168 | const struct timespec *tp) |
| 169 | { |
| 170 | return do_sys_settimeofday(tp, NULL); |
| 171 | } |
| 172 | |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 173 | /* |
| 174 | * Get monotonic time for posix timers |
| 175 | */ |
| 176 | static int posix_ktime_get_ts(clockid_t which_clock, struct timespec *tp) |
| 177 | { |
| 178 | ktime_get_ts(tp); |
| 179 | return 0; |
| 180 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 181 | |
| 182 | /* |
John Stultz | 2d42244 | 2008-08-20 16:37:30 -0700 | [diff] [blame] | 183 | * Get monotonic time for posix timers |
| 184 | */ |
| 185 | static int posix_get_monotonic_raw(clockid_t which_clock, struct timespec *tp) |
| 186 | { |
| 187 | getrawmonotonic(tp); |
| 188 | return 0; |
| 189 | } |
| 190 | |
john stultz | da15cfd | 2009-08-19 19:13:34 -0700 | [diff] [blame] | 191 | |
| 192 | static int posix_get_realtime_coarse(clockid_t which_clock, struct timespec *tp) |
| 193 | { |
| 194 | *tp = current_kernel_time(); |
| 195 | return 0; |
| 196 | } |
| 197 | |
| 198 | static int posix_get_monotonic_coarse(clockid_t which_clock, |
| 199 | struct timespec *tp) |
| 200 | { |
| 201 | *tp = get_monotonic_coarse(); |
| 202 | return 0; |
| 203 | } |
| 204 | |
H Hartley Sweeten | 6622e67 | 2010-02-02 14:41:42 -0800 | [diff] [blame] | 205 | static int posix_get_coarse_res(const clockid_t which_clock, struct timespec *tp) |
john stultz | da15cfd | 2009-08-19 19:13:34 -0700 | [diff] [blame] | 206 | { |
| 207 | *tp = ktime_to_timespec(KTIME_LOW_RES); |
| 208 | return 0; |
| 209 | } |
John Stultz | 2d42244 | 2008-08-20 16:37:30 -0700 | [diff] [blame] | 210 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 211 | * Initialize everything, well, just everything in Posix clocks/timers ;) |
| 212 | */ |
| 213 | static __init int init_posix_timers(void) |
| 214 | { |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 215 | struct k_clock clock_realtime = { |
Thomas Gleixner | 2fd1f04 | 2011-02-01 13:51:03 +0000 | [diff] [blame] | 216 | .clock_getres = hrtimer_get_res, |
Thomas Gleixner | 4228577 | 2011-02-01 13:51:50 +0000 | [diff] [blame] | 217 | .clock_get = posix_clock_realtime_get, |
Thomas Gleixner | 26f9a47 | 2011-02-01 13:51:48 +0000 | [diff] [blame] | 218 | .clock_set = posix_clock_realtime_set, |
Thomas Gleixner | a5cd288 | 2011-02-01 13:51:11 +0000 | [diff] [blame] | 219 | .nsleep = common_nsleep, |
Thomas Gleixner | 59bd5bc | 2011-02-01 13:51:17 +0000 | [diff] [blame] | 220 | .nsleep_restart = hrtimer_nanosleep_restart, |
Thomas Gleixner | 838394f | 2011-02-01 13:51:58 +0000 | [diff] [blame] | 221 | .timer_create = common_timer_create, |
Thomas Gleixner | 27722df | 2011-02-01 13:52:01 +0000 | [diff] [blame] | 222 | .timer_set = common_timer_set, |
Thomas Gleixner | a7319fa | 2011-02-01 13:52:04 +0000 | [diff] [blame] | 223 | .timer_get = common_timer_get, |
Thomas Gleixner | 6761c67 | 2011-02-01 13:52:07 +0000 | [diff] [blame] | 224 | .timer_del = common_timer_del, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 225 | }; |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 226 | struct k_clock clock_monotonic = { |
Thomas Gleixner | 2fd1f04 | 2011-02-01 13:51:03 +0000 | [diff] [blame] | 227 | .clock_getres = hrtimer_get_res, |
| 228 | .clock_get = posix_ktime_get_ts, |
Thomas Gleixner | a5cd288 | 2011-02-01 13:51:11 +0000 | [diff] [blame] | 229 | .nsleep = common_nsleep, |
Thomas Gleixner | 59bd5bc | 2011-02-01 13:51:17 +0000 | [diff] [blame] | 230 | .nsleep_restart = hrtimer_nanosleep_restart, |
Thomas Gleixner | 838394f | 2011-02-01 13:51:58 +0000 | [diff] [blame] | 231 | .timer_create = common_timer_create, |
Thomas Gleixner | 27722df | 2011-02-01 13:52:01 +0000 | [diff] [blame] | 232 | .timer_set = common_timer_set, |
Thomas Gleixner | a7319fa | 2011-02-01 13:52:04 +0000 | [diff] [blame] | 233 | .timer_get = common_timer_get, |
Thomas Gleixner | 6761c67 | 2011-02-01 13:52:07 +0000 | [diff] [blame] | 234 | .timer_del = common_timer_del, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 235 | }; |
John Stultz | 2d42244 | 2008-08-20 16:37:30 -0700 | [diff] [blame] | 236 | struct k_clock clock_monotonic_raw = { |
Thomas Gleixner | 2fd1f04 | 2011-02-01 13:51:03 +0000 | [diff] [blame] | 237 | .clock_getres = hrtimer_get_res, |
| 238 | .clock_get = posix_get_monotonic_raw, |
John Stultz | 2d42244 | 2008-08-20 16:37:30 -0700 | [diff] [blame] | 239 | }; |
john stultz | da15cfd | 2009-08-19 19:13:34 -0700 | [diff] [blame] | 240 | struct k_clock clock_realtime_coarse = { |
Thomas Gleixner | 2fd1f04 | 2011-02-01 13:51:03 +0000 | [diff] [blame] | 241 | .clock_getres = posix_get_coarse_res, |
| 242 | .clock_get = posix_get_realtime_coarse, |
john stultz | da15cfd | 2009-08-19 19:13:34 -0700 | [diff] [blame] | 243 | }; |
| 244 | struct k_clock clock_monotonic_coarse = { |
Thomas Gleixner | 2fd1f04 | 2011-02-01 13:51:03 +0000 | [diff] [blame] | 245 | .clock_getres = posix_get_coarse_res, |
| 246 | .clock_get = posix_get_monotonic_coarse, |
john stultz | da15cfd | 2009-08-19 19:13:34 -0700 | [diff] [blame] | 247 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 248 | |
| 249 | register_posix_clock(CLOCK_REALTIME, &clock_realtime); |
| 250 | register_posix_clock(CLOCK_MONOTONIC, &clock_monotonic); |
John Stultz | 2d42244 | 2008-08-20 16:37:30 -0700 | [diff] [blame] | 251 | register_posix_clock(CLOCK_MONOTONIC_RAW, &clock_monotonic_raw); |
john stultz | da15cfd | 2009-08-19 19:13:34 -0700 | [diff] [blame] | 252 | register_posix_clock(CLOCK_REALTIME_COARSE, &clock_realtime_coarse); |
| 253 | register_posix_clock(CLOCK_MONOTONIC_COARSE, &clock_monotonic_coarse); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 254 | |
| 255 | posix_timers_cache = kmem_cache_create("posix_timers_cache", |
Alexey Dobriyan | 040b5c6 | 2007-10-16 23:26:10 -0700 | [diff] [blame] | 256 | sizeof (struct k_itimer), 0, SLAB_PANIC, |
| 257 | NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 258 | idr_init(&posix_timers_id); |
| 259 | return 0; |
| 260 | } |
| 261 | |
| 262 | __initcall(init_posix_timers); |
| 263 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 264 | static void schedule_next_timer(struct k_itimer *timr) |
| 265 | { |
Roman Zippel | 44f2147 | 2006-03-26 01:38:06 -0800 | [diff] [blame] | 266 | struct hrtimer *timer = &timr->it.real.timer; |
| 267 | |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 268 | if (timr->it.real.interval.tv64 == 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 269 | return; |
| 270 | |
Davide Libenzi | 4d672e7 | 2008-02-04 22:27:26 -0800 | [diff] [blame] | 271 | timr->it_overrun += (unsigned int) hrtimer_forward(timer, |
| 272 | timer->base->get_time(), |
| 273 | timr->it.real.interval); |
Roman Zippel | 44f2147 | 2006-03-26 01:38:06 -0800 | [diff] [blame] | 274 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 275 | timr->it_overrun_last = timr->it_overrun; |
| 276 | timr->it_overrun = -1; |
| 277 | ++timr->it_requeue_pending; |
Roman Zippel | 44f2147 | 2006-03-26 01:38:06 -0800 | [diff] [blame] | 278 | hrtimer_restart(timer); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 279 | } |
| 280 | |
| 281 | /* |
| 282 | * This function is exported for use by the signal deliver code. It is |
| 283 | * called just prior to the info block being released and passes that |
| 284 | * block to us. It's function is to update the overrun entry AND to |
| 285 | * restart the timer. It should only be called if the timer is to be |
| 286 | * restarted (i.e. we have flagged this in the sys_private entry of the |
| 287 | * info block). |
| 288 | * |
| 289 | * To protect aginst the timer going away while the interrupt is queued, |
| 290 | * we require that the it_requeue_pending flag be set. |
| 291 | */ |
| 292 | void do_schedule_next_timer(struct siginfo *info) |
| 293 | { |
| 294 | struct k_itimer *timr; |
| 295 | unsigned long flags; |
| 296 | |
| 297 | timr = lock_timer(info->si_tid, &flags); |
| 298 | |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 299 | if (timr && timr->it_requeue_pending == info->si_sys_private) { |
| 300 | if (timr->it_clock < 0) |
| 301 | posix_cpu_timer_schedule(timr); |
| 302 | else |
| 303 | schedule_next_timer(timr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 304 | |
Oleg Nesterov | 54da117 | 2008-07-23 20:52:05 +0400 | [diff] [blame] | 305 | info->si_overrun += timr->it_overrun_last; |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 306 | } |
| 307 | |
Thomas Gleixner | b6557fb | 2006-02-01 03:05:09 -0800 | [diff] [blame] | 308 | if (timr) |
| 309 | unlock_timer(timr, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 310 | } |
| 311 | |
Oleg Nesterov | ba66129 | 2008-07-23 20:52:05 +0400 | [diff] [blame] | 312 | int posix_timer_event(struct k_itimer *timr, int si_private) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 313 | { |
Oleg Nesterov | 27af424 | 2008-12-01 14:18:13 -0800 | [diff] [blame] | 314 | struct task_struct *task; |
| 315 | int shared, ret = -1; |
Oleg Nesterov | ba66129 | 2008-07-23 20:52:05 +0400 | [diff] [blame] | 316 | /* |
| 317 | * FIXME: if ->sigq is queued we can race with |
| 318 | * dequeue_signal()->do_schedule_next_timer(). |
| 319 | * |
| 320 | * If dequeue_signal() sees the "right" value of |
| 321 | * si_sys_private it calls do_schedule_next_timer(). |
| 322 | * We re-queue ->sigq and drop ->it_lock(). |
| 323 | * do_schedule_next_timer() locks the timer |
| 324 | * and re-schedules it while ->sigq is pending. |
| 325 | * Not really bad, but not that we want. |
| 326 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 327 | timr->sigq->info.si_sys_private = si_private; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 328 | |
Oleg Nesterov | 27af424 | 2008-12-01 14:18:13 -0800 | [diff] [blame] | 329 | rcu_read_lock(); |
| 330 | task = pid_task(timr->it_pid, PIDTYPE_PID); |
| 331 | if (task) { |
| 332 | shared = !(timr->it_sigev_notify & SIGEV_THREAD_ID); |
| 333 | ret = send_sigqueue(timr->sigq, task, shared); |
| 334 | } |
| 335 | rcu_read_unlock(); |
Oleg Nesterov | 4aa7361 | 2008-09-22 14:42:46 -0700 | [diff] [blame] | 336 | /* If we failed to send the signal the timer stops. */ |
| 337 | return ret > 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 338 | } |
| 339 | EXPORT_SYMBOL_GPL(posix_timer_event); |
| 340 | |
| 341 | /* |
| 342 | * This function gets called when a POSIX.1b interval timer expires. It |
| 343 | * is used as a callback from the kernel internal timer. The |
| 344 | * run_timer_list code ALWAYS calls with interrupts on. |
| 345 | |
| 346 | * This code is for CLOCK_REALTIME* and CLOCK_MONOTONIC* timers. |
| 347 | */ |
Thomas Gleixner | c9cb2e3 | 2007-02-16 01:27:49 -0800 | [diff] [blame] | 348 | static enum hrtimer_restart posix_timer_fn(struct hrtimer *timer) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 349 | { |
Roman Zippel | 05cfb61 | 2006-03-26 01:38:12 -0800 | [diff] [blame] | 350 | struct k_itimer *timr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 351 | unsigned long flags; |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 352 | int si_private = 0; |
Thomas Gleixner | c9cb2e3 | 2007-02-16 01:27:49 -0800 | [diff] [blame] | 353 | enum hrtimer_restart ret = HRTIMER_NORESTART; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 354 | |
Roman Zippel | 05cfb61 | 2006-03-26 01:38:12 -0800 | [diff] [blame] | 355 | timr = container_of(timer, struct k_itimer, it.real.timer); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 356 | spin_lock_irqsave(&timr->it_lock, flags); |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 357 | |
| 358 | if (timr->it.real.interval.tv64 != 0) |
| 359 | si_private = ++timr->it_requeue_pending; |
| 360 | |
| 361 | if (posix_timer_event(timr, si_private)) { |
| 362 | /* |
| 363 | * signal was not sent because of sig_ignor |
| 364 | * we will not get a call back to restart it AND |
| 365 | * it should be restarted. |
| 366 | */ |
| 367 | if (timr->it.real.interval.tv64 != 0) { |
Thomas Gleixner | 58229a1 | 2007-06-21 20:45:15 +0000 | [diff] [blame] | 368 | ktime_t now = hrtimer_cb_get_time(timer); |
| 369 | |
| 370 | /* |
| 371 | * FIXME: What we really want, is to stop this |
| 372 | * timer completely and restart it in case the |
| 373 | * SIG_IGN is removed. This is a non trivial |
| 374 | * change which involves sighand locking |
| 375 | * (sigh !), which we don't want to do late in |
| 376 | * the release cycle. |
| 377 | * |
| 378 | * For now we just let timers with an interval |
| 379 | * less than a jiffie expire every jiffie to |
| 380 | * avoid softirq starvation in case of SIG_IGN |
| 381 | * and a very small interval, which would put |
| 382 | * the timer right back on the softirq pending |
| 383 | * list. By moving now ahead of time we trick |
| 384 | * hrtimer_forward() to expire the timer |
| 385 | * later, while we still maintain the overrun |
| 386 | * accuracy, but have some inconsistency in |
| 387 | * the timer_gettime() case. This is at least |
| 388 | * better than a starved softirq. A more |
| 389 | * complex fix which solves also another related |
| 390 | * inconsistency is already in the pipeline. |
| 391 | */ |
| 392 | #ifdef CONFIG_HIGH_RES_TIMERS |
| 393 | { |
| 394 | ktime_t kj = ktime_set(0, NSEC_PER_SEC / HZ); |
| 395 | |
| 396 | if (timr->it.real.interval.tv64 < kj.tv64) |
| 397 | now = ktime_add(now, kj); |
| 398 | } |
| 399 | #endif |
Davide Libenzi | 4d672e7 | 2008-02-04 22:27:26 -0800 | [diff] [blame] | 400 | timr->it_overrun += (unsigned int) |
Thomas Gleixner | 58229a1 | 2007-06-21 20:45:15 +0000 | [diff] [blame] | 401 | hrtimer_forward(timer, now, |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 402 | timr->it.real.interval); |
| 403 | ret = HRTIMER_RESTART; |
Roman Zippel | a0a0c28 | 2006-03-16 23:04:01 -0800 | [diff] [blame] | 404 | ++timr->it_requeue_pending; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 405 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 406 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 407 | |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 408 | unlock_timer(timr, flags); |
| 409 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 410 | } |
| 411 | |
Oleg Nesterov | 27af424 | 2008-12-01 14:18:13 -0800 | [diff] [blame] | 412 | static struct pid *good_sigevent(sigevent_t * event) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 413 | { |
| 414 | struct task_struct *rtn = current->group_leader; |
| 415 | |
| 416 | if ((event->sigev_notify & SIGEV_THREAD_ID ) && |
Pavel Emelyanov | 8dc86af | 2008-02-08 04:21:52 -0800 | [diff] [blame] | 417 | (!(rtn = find_task_by_vpid(event->sigev_notify_thread_id)) || |
Pavel Emelyanov | bac0abd | 2007-10-18 23:40:18 -0700 | [diff] [blame] | 418 | !same_thread_group(rtn, current) || |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 419 | (event->sigev_notify & ~SIGEV_THREAD_ID) != SIGEV_SIGNAL)) |
| 420 | return NULL; |
| 421 | |
| 422 | if (((event->sigev_notify & ~SIGEV_THREAD_ID) != SIGEV_NONE) && |
| 423 | ((event->sigev_signo <= 0) || (event->sigev_signo > SIGRTMAX))) |
| 424 | return NULL; |
| 425 | |
Oleg Nesterov | 27af424 | 2008-12-01 14:18:13 -0800 | [diff] [blame] | 426 | return task_pid(rtn); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 427 | } |
| 428 | |
Thomas Gleixner | a924b04 | 2006-01-09 20:52:27 -0800 | [diff] [blame] | 429 | void register_posix_clock(const clockid_t clock_id, struct k_clock *new_clock) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 430 | { |
| 431 | if ((unsigned) clock_id >= MAX_CLOCKS) { |
Thomas Gleixner | 4359ac0 | 2011-02-02 11:45:23 +0100 | [diff] [blame] | 432 | printk(KERN_WARNING "POSIX clock register failed for clock_id %d\n", |
| 433 | clock_id); |
| 434 | return; |
| 435 | } |
| 436 | |
| 437 | if (!new_clock->clock_get) { |
| 438 | printk(KERN_WARNING "POSIX clock id %d lacks clock_get()\n", |
| 439 | clock_id); |
| 440 | return; |
| 441 | } |
| 442 | if (!new_clock->clock_getres) { |
| 443 | printk(KERN_WARNING "POSIX clock id %d lacks clock_getres()\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 444 | clock_id); |
| 445 | return; |
| 446 | } |
| 447 | |
| 448 | posix_clocks[clock_id] = *new_clock; |
| 449 | } |
| 450 | EXPORT_SYMBOL_GPL(register_posix_clock); |
| 451 | |
| 452 | static struct k_itimer * alloc_posix_timer(void) |
| 453 | { |
| 454 | struct k_itimer *tmr; |
Robert P. J. Day | c376222 | 2007-02-10 01:45:03 -0800 | [diff] [blame] | 455 | tmr = kmem_cache_zalloc(posix_timers_cache, GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 456 | if (!tmr) |
| 457 | return tmr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 458 | if (unlikely(!(tmr->sigq = sigqueue_alloc()))) { |
| 459 | kmem_cache_free(posix_timers_cache, tmr); |
Dan Carpenter | aa94fbd | 2008-10-02 14:50:14 -0700 | [diff] [blame] | 460 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 461 | } |
Oleg Nesterov | ba66129 | 2008-07-23 20:52:05 +0400 | [diff] [blame] | 462 | memset(&tmr->sigq->info, 0, sizeof(siginfo_t)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 463 | return tmr; |
| 464 | } |
| 465 | |
| 466 | #define IT_ID_SET 1 |
| 467 | #define IT_ID_NOT_SET 0 |
| 468 | static void release_posix_timer(struct k_itimer *tmr, int it_id_set) |
| 469 | { |
| 470 | if (it_id_set) { |
| 471 | unsigned long flags; |
| 472 | spin_lock_irqsave(&idr_lock, flags); |
| 473 | idr_remove(&posix_timers_id, tmr->it_id); |
| 474 | spin_unlock_irqrestore(&idr_lock, flags); |
| 475 | } |
Oleg Nesterov | 8999210 | 2008-12-01 14:18:15 -0800 | [diff] [blame] | 476 | put_pid(tmr->it_pid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 477 | sigqueue_free(tmr->sigq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 478 | kmem_cache_free(posix_timers_cache, tmr); |
| 479 | } |
| 480 | |
Thomas Gleixner | cc785ac | 2011-02-01 13:51:09 +0000 | [diff] [blame] | 481 | static struct k_clock *clockid_to_kclock(const clockid_t id) |
| 482 | { |
| 483 | if (id < 0) |
| 484 | return &clock_posix_cpu; |
| 485 | |
| 486 | if (id >= MAX_CLOCKS || !posix_clocks[id].clock_getres) |
| 487 | return NULL; |
| 488 | return &posix_clocks[id]; |
| 489 | } |
| 490 | |
Thomas Gleixner | 838394f | 2011-02-01 13:51:58 +0000 | [diff] [blame] | 491 | static int common_timer_create(struct k_itimer *new_timer) |
| 492 | { |
| 493 | hrtimer_init(&new_timer->it.real.timer, new_timer->it_clock, 0); |
| 494 | return 0; |
| 495 | } |
| 496 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 497 | /* Create a POSIX.1b interval timer. */ |
| 498 | |
Heiko Carstens | 362e9c0 | 2009-01-14 14:14:07 +0100 | [diff] [blame] | 499 | SYSCALL_DEFINE3(timer_create, const clockid_t, which_clock, |
| 500 | struct sigevent __user *, timer_event_spec, |
| 501 | timer_t __user *, created_timer_id) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 502 | { |
Thomas Gleixner | 838394f | 2011-02-01 13:51:58 +0000 | [diff] [blame] | 503 | struct k_clock *kc = clockid_to_kclock(which_clock); |
Oleg Nesterov | 2cd499e | 2008-09-22 14:42:47 -0700 | [diff] [blame] | 504 | struct k_itimer *new_timer; |
Oleg Nesterov | ef864c9 | 2008-09-22 14:42:49 -0700 | [diff] [blame] | 505 | int error, new_timer_id; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 506 | sigevent_t event; |
| 507 | int it_id_set = IT_ID_NOT_SET; |
| 508 | |
Thomas Gleixner | 838394f | 2011-02-01 13:51:58 +0000 | [diff] [blame] | 509 | if (!kc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 510 | return -EINVAL; |
Thomas Gleixner | 838394f | 2011-02-01 13:51:58 +0000 | [diff] [blame] | 511 | if (!kc->timer_create) |
| 512 | return -EOPNOTSUPP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 513 | |
| 514 | new_timer = alloc_posix_timer(); |
| 515 | if (unlikely(!new_timer)) |
| 516 | return -EAGAIN; |
| 517 | |
| 518 | spin_lock_init(&new_timer->it_lock); |
| 519 | retry: |
| 520 | if (unlikely(!idr_pre_get(&posix_timers_id, GFP_KERNEL))) { |
| 521 | error = -EAGAIN; |
| 522 | goto out; |
| 523 | } |
| 524 | spin_lock_irq(&idr_lock); |
Oleg Nesterov | 5a51b71 | 2008-09-22 14:42:51 -0700 | [diff] [blame] | 525 | error = idr_get_new(&posix_timers_id, new_timer, &new_timer_id); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 526 | spin_unlock_irq(&idr_lock); |
Oleg Nesterov | ef864c9 | 2008-09-22 14:42:49 -0700 | [diff] [blame] | 527 | if (error) { |
| 528 | if (error == -EAGAIN) |
| 529 | goto retry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 530 | /* |
Joe Perches | 0b0a3e7 | 2008-02-03 17:48:04 +0200 | [diff] [blame] | 531 | * Weird looking, but we return EAGAIN if the IDR is |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 532 | * full (proper POSIX return value for this) |
| 533 | */ |
| 534 | error = -EAGAIN; |
| 535 | goto out; |
| 536 | } |
| 537 | |
| 538 | it_id_set = IT_ID_SET; |
| 539 | new_timer->it_id = (timer_t) new_timer_id; |
| 540 | new_timer->it_clock = which_clock; |
| 541 | new_timer->it_overrun = -1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 542 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 543 | if (timer_event_spec) { |
| 544 | if (copy_from_user(&event, timer_event_spec, sizeof (event))) { |
| 545 | error = -EFAULT; |
| 546 | goto out; |
| 547 | } |
Oleg Nesterov | 36b2f04 | 2008-09-22 14:42:48 -0700 | [diff] [blame] | 548 | rcu_read_lock(); |
Oleg Nesterov | 8999210 | 2008-12-01 14:18:15 -0800 | [diff] [blame] | 549 | new_timer->it_pid = get_pid(good_sigevent(&event)); |
Oleg Nesterov | 36b2f04 | 2008-09-22 14:42:48 -0700 | [diff] [blame] | 550 | rcu_read_unlock(); |
Oleg Nesterov | 8999210 | 2008-12-01 14:18:15 -0800 | [diff] [blame] | 551 | if (!new_timer->it_pid) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 552 | error = -EINVAL; |
| 553 | goto out; |
| 554 | } |
| 555 | } else { |
Oleg Nesterov | 5a9fa73 | 2008-09-22 14:42:50 -0700 | [diff] [blame] | 556 | event.sigev_notify = SIGEV_SIGNAL; |
| 557 | event.sigev_signo = SIGALRM; |
| 558 | event.sigev_value.sival_int = new_timer->it_id; |
Oleg Nesterov | 8999210 | 2008-12-01 14:18:15 -0800 | [diff] [blame] | 559 | new_timer->it_pid = get_pid(task_tgid(current)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 560 | } |
| 561 | |
Oleg Nesterov | 5a9fa73 | 2008-09-22 14:42:50 -0700 | [diff] [blame] | 562 | new_timer->it_sigev_notify = event.sigev_notify; |
| 563 | new_timer->sigq->info.si_signo = event.sigev_signo; |
| 564 | new_timer->sigq->info.si_value = event.sigev_value; |
Oleg Nesterov | 717835d | 2008-09-22 14:42:49 -0700 | [diff] [blame] | 565 | new_timer->sigq->info.si_tid = new_timer->it_id; |
Oleg Nesterov | 5a9fa73 | 2008-09-22 14:42:50 -0700 | [diff] [blame] | 566 | new_timer->sigq->info.si_code = SI_TIMER; |
Oleg Nesterov | 717835d | 2008-09-22 14:42:49 -0700 | [diff] [blame] | 567 | |
Andrey Vagin | 2b08de0 | 2010-07-20 15:23:14 -0700 | [diff] [blame] | 568 | if (copy_to_user(created_timer_id, |
| 569 | &new_timer_id, sizeof (new_timer_id))) { |
| 570 | error = -EFAULT; |
| 571 | goto out; |
| 572 | } |
| 573 | |
Thomas Gleixner | 838394f | 2011-02-01 13:51:58 +0000 | [diff] [blame] | 574 | error = kc->timer_create(new_timer); |
Andrey Vagin | 45e0fff | 2010-05-24 12:15:33 -0700 | [diff] [blame] | 575 | if (error) |
| 576 | goto out; |
| 577 | |
Oleg Nesterov | 36b2f04 | 2008-09-22 14:42:48 -0700 | [diff] [blame] | 578 | spin_lock_irq(¤t->sighand->siglock); |
Oleg Nesterov | 27af424 | 2008-12-01 14:18:13 -0800 | [diff] [blame] | 579 | new_timer->it_signal = current->signal; |
Oleg Nesterov | 36b2f04 | 2008-09-22 14:42:48 -0700 | [diff] [blame] | 580 | list_add(&new_timer->list, ¤t->signal->posix_timers); |
| 581 | spin_unlock_irq(¤t->sighand->siglock); |
Oleg Nesterov | ef864c9 | 2008-09-22 14:42:49 -0700 | [diff] [blame] | 582 | |
| 583 | return 0; |
Thomas Gleixner | 838394f | 2011-02-01 13:51:58 +0000 | [diff] [blame] | 584 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 585 | * In the case of the timer belonging to another task, after |
| 586 | * the task is unlocked, the timer is owned by the other task |
| 587 | * and may cease to exist at any time. Don't use or modify |
| 588 | * new_timer after the unlock call. |
| 589 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 590 | out: |
Oleg Nesterov | ef864c9 | 2008-09-22 14:42:49 -0700 | [diff] [blame] | 591 | release_posix_timer(new_timer, it_id_set); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 592 | return error; |
| 593 | } |
| 594 | |
| 595 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 596 | * Locking issues: We need to protect the result of the id look up until |
| 597 | * we get the timer locked down so it is not deleted under us. The |
| 598 | * removal is done under the idr spinlock so we use that here to bridge |
| 599 | * the find to the timer lock. To avoid a dead lock, the timer id MUST |
| 600 | * be release with out holding the timer lock. |
| 601 | */ |
Namhyung Kim | 20f33a0 | 2010-10-20 15:57:34 -0700 | [diff] [blame] | 602 | static struct k_itimer *__lock_timer(timer_t timer_id, unsigned long *flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 603 | { |
| 604 | struct k_itimer *timr; |
| 605 | /* |
| 606 | * Watch out here. We do a irqsave on the idr_lock and pass the |
| 607 | * flags part over to the timer lock. Must not let interrupts in |
| 608 | * while we are moving the lock. |
| 609 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 610 | spin_lock_irqsave(&idr_lock, *flags); |
Oleg Nesterov | 31d9284 | 2008-09-22 14:42:51 -0700 | [diff] [blame] | 611 | timr = idr_find(&posix_timers_id, (int)timer_id); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 612 | if (timr) { |
| 613 | spin_lock(&timr->it_lock); |
Oleg Nesterov | 8999210 | 2008-12-01 14:18:15 -0800 | [diff] [blame] | 614 | if (timr->it_signal == current->signal) { |
Thomas Gleixner | 179394a | 2007-08-22 14:01:37 -0700 | [diff] [blame] | 615 | spin_unlock(&idr_lock); |
Oleg Nesterov | 31d9284 | 2008-09-22 14:42:51 -0700 | [diff] [blame] | 616 | return timr; |
| 617 | } |
| 618 | spin_unlock(&timr->it_lock); |
| 619 | } |
| 620 | spin_unlock_irqrestore(&idr_lock, *flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 621 | |
Oleg Nesterov | 31d9284 | 2008-09-22 14:42:51 -0700 | [diff] [blame] | 622 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 623 | } |
| 624 | |
| 625 | /* |
| 626 | * Get the time remaining on a POSIX.1b interval timer. This function |
| 627 | * is ALWAYS called with spin_lock_irq on the timer, thus it must not |
| 628 | * mess with irq. |
| 629 | * |
| 630 | * We have a couple of messes to clean up here. First there is the case |
| 631 | * of a timer that has a requeue pending. These timers should appear to |
| 632 | * be in the timer list with an expiry as if we were to requeue them |
| 633 | * now. |
| 634 | * |
| 635 | * The second issue is the SIGEV_NONE timer which may be active but is |
| 636 | * not really ever put in the timer list (to save system resources). |
| 637 | * This timer may be expired, and if so, we will do it here. Otherwise |
| 638 | * it is the same as a requeue pending timer WRT to what we should |
| 639 | * report. |
| 640 | */ |
| 641 | static void |
| 642 | common_timer_get(struct k_itimer *timr, struct itimerspec *cur_setting) |
| 643 | { |
Roman Zippel | 3b98a53 | 2006-03-26 01:38:07 -0800 | [diff] [blame] | 644 | ktime_t now, remaining, iv; |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 645 | struct hrtimer *timer = &timr->it.real.timer; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 646 | |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 647 | memset(cur_setting, 0, sizeof(struct itimerspec)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 648 | |
Roman Zippel | 3b98a53 | 2006-03-26 01:38:07 -0800 | [diff] [blame] | 649 | iv = timr->it.real.interval; |
| 650 | |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 651 | /* interval timer ? */ |
Roman Zippel | 3b98a53 | 2006-03-26 01:38:07 -0800 | [diff] [blame] | 652 | if (iv.tv64) |
| 653 | cur_setting->it_interval = ktime_to_timespec(iv); |
| 654 | else if (!hrtimer_active(timer) && |
| 655 | (timr->it_sigev_notify & ~SIGEV_THREAD_ID) != SIGEV_NONE) |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 656 | return; |
Roman Zippel | 3b98a53 | 2006-03-26 01:38:07 -0800 | [diff] [blame] | 657 | |
| 658 | now = timer->base->get_time(); |
| 659 | |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 660 | /* |
Roman Zippel | 3b98a53 | 2006-03-26 01:38:07 -0800 | [diff] [blame] | 661 | * When a requeue is pending or this is a SIGEV_NONE |
| 662 | * timer move the expiry time forward by intervals, so |
| 663 | * expiry is > now. |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 664 | */ |
Roman Zippel | 3b98a53 | 2006-03-26 01:38:07 -0800 | [diff] [blame] | 665 | if (iv.tv64 && (timr->it_requeue_pending & REQUEUE_PENDING || |
| 666 | (timr->it_sigev_notify & ~SIGEV_THREAD_ID) == SIGEV_NONE)) |
Davide Libenzi | 4d672e7 | 2008-02-04 22:27:26 -0800 | [diff] [blame] | 667 | timr->it_overrun += (unsigned int) hrtimer_forward(timer, now, iv); |
Roman Zippel | 3b98a53 | 2006-03-26 01:38:07 -0800 | [diff] [blame] | 668 | |
Arjan van de Ven | cc584b2 | 2008-09-01 15:02:30 -0700 | [diff] [blame] | 669 | remaining = ktime_sub(hrtimer_get_expires(timer), now); |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 670 | /* Return 0 only, when the timer is expired and not pending */ |
Roman Zippel | 3b98a53 | 2006-03-26 01:38:07 -0800 | [diff] [blame] | 671 | if (remaining.tv64 <= 0) { |
| 672 | /* |
| 673 | * A single shot SIGEV_NONE timer must return 0, when |
| 674 | * it is expired ! |
| 675 | */ |
| 676 | if ((timr->it_sigev_notify & ~SIGEV_THREAD_ID) != SIGEV_NONE) |
| 677 | cur_setting->it_value.tv_nsec = 1; |
| 678 | } else |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 679 | cur_setting->it_value = ktime_to_timespec(remaining); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 680 | } |
| 681 | |
| 682 | /* Get the time remaining on a POSIX.1b interval timer. */ |
Heiko Carstens | 362e9c0 | 2009-01-14 14:14:07 +0100 | [diff] [blame] | 683 | SYSCALL_DEFINE2(timer_gettime, timer_t, timer_id, |
| 684 | struct itimerspec __user *, setting) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 685 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 686 | struct itimerspec cur_setting; |
Thomas Gleixner | a7319fa | 2011-02-01 13:52:04 +0000 | [diff] [blame] | 687 | struct k_itimer *timr; |
| 688 | struct k_clock *kc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 689 | unsigned long flags; |
Thomas Gleixner | a7319fa | 2011-02-01 13:52:04 +0000 | [diff] [blame] | 690 | int ret = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 691 | |
| 692 | timr = lock_timer(timer_id, &flags); |
| 693 | if (!timr) |
| 694 | return -EINVAL; |
| 695 | |
Thomas Gleixner | a7319fa | 2011-02-01 13:52:04 +0000 | [diff] [blame] | 696 | kc = clockid_to_kclock(timr->it_clock); |
| 697 | if (WARN_ON_ONCE(!kc || !kc->timer_get)) |
| 698 | ret = -EINVAL; |
| 699 | else |
| 700 | kc->timer_get(timr, &cur_setting); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 701 | |
| 702 | unlock_timer(timr, flags); |
| 703 | |
Thomas Gleixner | a7319fa | 2011-02-01 13:52:04 +0000 | [diff] [blame] | 704 | if (!ret && copy_to_user(setting, &cur_setting, sizeof (cur_setting))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 705 | return -EFAULT; |
| 706 | |
Thomas Gleixner | a7319fa | 2011-02-01 13:52:04 +0000 | [diff] [blame] | 707 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 708 | } |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 709 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 710 | /* |
| 711 | * Get the number of overruns of a POSIX.1b interval timer. This is to |
| 712 | * be the overrun of the timer last delivered. At the same time we are |
| 713 | * accumulating overruns on the next timer. The overrun is frozen when |
| 714 | * the signal is delivered, either at the notify time (if the info block |
| 715 | * is not queued) or at the actual delivery time (as we are informed by |
| 716 | * the call back to do_schedule_next_timer(). So all we need to do is |
| 717 | * to pick up the frozen overrun. |
| 718 | */ |
Heiko Carstens | 362e9c0 | 2009-01-14 14:14:07 +0100 | [diff] [blame] | 719 | SYSCALL_DEFINE1(timer_getoverrun, timer_t, timer_id) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 720 | { |
| 721 | struct k_itimer *timr; |
| 722 | int overrun; |
Al Viro | 5ba2533 | 2007-10-14 19:35:50 +0100 | [diff] [blame] | 723 | unsigned long flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 724 | |
| 725 | timr = lock_timer(timer_id, &flags); |
| 726 | if (!timr) |
| 727 | return -EINVAL; |
| 728 | |
| 729 | overrun = timr->it_overrun_last; |
| 730 | unlock_timer(timr, flags); |
| 731 | |
| 732 | return overrun; |
| 733 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 734 | |
| 735 | /* Set a POSIX.1b interval timer. */ |
| 736 | /* timr->it_lock is taken. */ |
Arjan van de Ven | 858119e | 2006-01-14 13:20:43 -0800 | [diff] [blame] | 737 | static int |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 738 | common_timer_set(struct k_itimer *timr, int flags, |
| 739 | struct itimerspec *new_setting, struct itimerspec *old_setting) |
| 740 | { |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 741 | struct hrtimer *timer = &timr->it.real.timer; |
George Anzinger | 7978672c | 2006-02-01 03:05:11 -0800 | [diff] [blame] | 742 | enum hrtimer_mode mode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 743 | |
| 744 | if (old_setting) |
| 745 | common_timer_get(timr, old_setting); |
| 746 | |
| 747 | /* disable the timer */ |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 748 | timr->it.real.interval.tv64 = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 749 | /* |
| 750 | * careful here. If smp we could be in the "fire" routine which will |
| 751 | * be spinning as we hold the lock. But this is ONLY an SMP issue. |
| 752 | */ |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 753 | if (hrtimer_try_to_cancel(timer) < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 754 | return TIMER_RETRY; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 755 | |
| 756 | timr->it_requeue_pending = (timr->it_requeue_pending + 2) & |
| 757 | ~REQUEUE_PENDING; |
| 758 | timr->it_overrun_last = 0; |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 759 | |
| 760 | /* switch off the timer when it_value is zero */ |
| 761 | if (!new_setting->it_value.tv_sec && !new_setting->it_value.tv_nsec) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 762 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 763 | |
Thomas Gleixner | c9cb2e3 | 2007-02-16 01:27:49 -0800 | [diff] [blame] | 764 | mode = flags & TIMER_ABSTIME ? HRTIMER_MODE_ABS : HRTIMER_MODE_REL; |
George Anzinger | 7978672c | 2006-02-01 03:05:11 -0800 | [diff] [blame] | 765 | hrtimer_init(&timr->it.real.timer, timr->it_clock, mode); |
George Anzinger | 7978672c | 2006-02-01 03:05:11 -0800 | [diff] [blame] | 766 | timr->it.real.timer.function = posix_timer_fn; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 767 | |
Arjan van de Ven | cc584b2 | 2008-09-01 15:02:30 -0700 | [diff] [blame] | 768 | hrtimer_set_expires(timer, timespec_to_ktime(new_setting->it_value)); |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 769 | |
| 770 | /* Convert interval */ |
| 771 | timr->it.real.interval = timespec_to_ktime(new_setting->it_interval); |
| 772 | |
| 773 | /* SIGEV_NONE timers are not queued ! See common_timer_get */ |
Thomas Gleixner | 952bbc8 | 2006-02-01 03:05:13 -0800 | [diff] [blame] | 774 | if (((timr->it_sigev_notify & ~SIGEV_THREAD_ID) == SIGEV_NONE)) { |
| 775 | /* Setup correct expiry time for relative timers */ |
Thomas Gleixner | 5a7780e | 2008-02-13 09:20:43 +0100 | [diff] [blame] | 776 | if (mode == HRTIMER_MODE_REL) { |
Arjan van de Ven | cc584b2 | 2008-09-01 15:02:30 -0700 | [diff] [blame] | 777 | hrtimer_add_expires(timer, timer->base->get_time()); |
Thomas Gleixner | 5a7780e | 2008-02-13 09:20:43 +0100 | [diff] [blame] | 778 | } |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 779 | return 0; |
Thomas Gleixner | 952bbc8 | 2006-02-01 03:05:13 -0800 | [diff] [blame] | 780 | } |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 781 | |
Arjan van de Ven | cc584b2 | 2008-09-01 15:02:30 -0700 | [diff] [blame] | 782 | hrtimer_start_expires(timer, mode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 783 | return 0; |
| 784 | } |
| 785 | |
| 786 | /* Set a POSIX.1b interval timer */ |
Heiko Carstens | 362e9c0 | 2009-01-14 14:14:07 +0100 | [diff] [blame] | 787 | SYSCALL_DEFINE4(timer_settime, timer_t, timer_id, int, flags, |
| 788 | const struct itimerspec __user *, new_setting, |
| 789 | struct itimerspec __user *, old_setting) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 790 | { |
| 791 | struct k_itimer *timr; |
| 792 | struct itimerspec new_spec, old_spec; |
| 793 | int error = 0; |
Al Viro | 5ba2533 | 2007-10-14 19:35:50 +0100 | [diff] [blame] | 794 | unsigned long flag; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 795 | struct itimerspec *rtn = old_setting ? &old_spec : NULL; |
Thomas Gleixner | 27722df | 2011-02-01 13:52:01 +0000 | [diff] [blame] | 796 | struct k_clock *kc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 797 | |
| 798 | if (!new_setting) |
| 799 | return -EINVAL; |
| 800 | |
| 801 | if (copy_from_user(&new_spec, new_setting, sizeof (new_spec))) |
| 802 | return -EFAULT; |
| 803 | |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 804 | if (!timespec_valid(&new_spec.it_interval) || |
| 805 | !timespec_valid(&new_spec.it_value)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 806 | return -EINVAL; |
| 807 | retry: |
| 808 | timr = lock_timer(timer_id, &flag); |
| 809 | if (!timr) |
| 810 | return -EINVAL; |
| 811 | |
Thomas Gleixner | 27722df | 2011-02-01 13:52:01 +0000 | [diff] [blame] | 812 | kc = clockid_to_kclock(timr->it_clock); |
| 813 | if (WARN_ON_ONCE(!kc || !kc->timer_set)) |
| 814 | error = -EINVAL; |
| 815 | else |
| 816 | error = kc->timer_set(timr, flags, &new_spec, rtn); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 817 | |
| 818 | unlock_timer(timr, flag); |
| 819 | if (error == TIMER_RETRY) { |
| 820 | rtn = NULL; // We already got the old time... |
| 821 | goto retry; |
| 822 | } |
| 823 | |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 824 | if (old_setting && !error && |
| 825 | copy_to_user(old_setting, &old_spec, sizeof (old_spec))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 826 | error = -EFAULT; |
| 827 | |
| 828 | return error; |
| 829 | } |
| 830 | |
Thomas Gleixner | 6761c67 | 2011-02-01 13:52:07 +0000 | [diff] [blame] | 831 | static int common_timer_del(struct k_itimer *timer) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 832 | { |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 833 | timer->it.real.interval.tv64 = 0; |
Oleg Nesterov | f972be3 | 2005-06-23 00:09:00 -0700 | [diff] [blame] | 834 | |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 835 | if (hrtimer_try_to_cancel(&timer->it.real.timer) < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 836 | return TIMER_RETRY; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 837 | return 0; |
| 838 | } |
| 839 | |
| 840 | static inline int timer_delete_hook(struct k_itimer *timer) |
| 841 | { |
Thomas Gleixner | 6761c67 | 2011-02-01 13:52:07 +0000 | [diff] [blame] | 842 | struct k_clock *kc = clockid_to_kclock(timer->it_clock); |
| 843 | |
| 844 | if (WARN_ON_ONCE(!kc || !kc->timer_del)) |
| 845 | return -EINVAL; |
| 846 | return kc->timer_del(timer); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 847 | } |
| 848 | |
| 849 | /* Delete a POSIX.1b interval timer. */ |
Heiko Carstens | 362e9c0 | 2009-01-14 14:14:07 +0100 | [diff] [blame] | 850 | SYSCALL_DEFINE1(timer_delete, timer_t, timer_id) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 851 | { |
| 852 | struct k_itimer *timer; |
Al Viro | 5ba2533 | 2007-10-14 19:35:50 +0100 | [diff] [blame] | 853 | unsigned long flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 854 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 855 | retry_delete: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 856 | timer = lock_timer(timer_id, &flags); |
| 857 | if (!timer) |
| 858 | return -EINVAL; |
| 859 | |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 860 | if (timer_delete_hook(timer) == TIMER_RETRY) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 861 | unlock_timer(timer, flags); |
| 862 | goto retry_delete; |
| 863 | } |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 864 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 865 | spin_lock(¤t->sighand->siglock); |
| 866 | list_del(&timer->list); |
| 867 | spin_unlock(¤t->sighand->siglock); |
| 868 | /* |
| 869 | * This keeps any tasks waiting on the spin lock from thinking |
| 870 | * they got something (see the lock code above). |
| 871 | */ |
Oleg Nesterov | 8999210 | 2008-12-01 14:18:15 -0800 | [diff] [blame] | 872 | timer->it_signal = NULL; |
Oleg Nesterov | 4b7a130 | 2008-07-25 01:47:26 -0700 | [diff] [blame] | 873 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 874 | unlock_timer(timer, flags); |
| 875 | release_posix_timer(timer, IT_ID_SET); |
| 876 | return 0; |
| 877 | } |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 878 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 879 | /* |
| 880 | * return timer owned by the process, used by exit_itimers |
| 881 | */ |
Arjan van de Ven | 858119e | 2006-01-14 13:20:43 -0800 | [diff] [blame] | 882 | static void itimer_delete(struct k_itimer *timer) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 883 | { |
| 884 | unsigned long flags; |
| 885 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 886 | retry_delete: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 887 | spin_lock_irqsave(&timer->it_lock, flags); |
| 888 | |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 889 | if (timer_delete_hook(timer) == TIMER_RETRY) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 890 | unlock_timer(timer, flags); |
| 891 | goto retry_delete; |
| 892 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 893 | list_del(&timer->list); |
| 894 | /* |
| 895 | * This keeps any tasks waiting on the spin lock from thinking |
| 896 | * they got something (see the lock code above). |
| 897 | */ |
Oleg Nesterov | 8999210 | 2008-12-01 14:18:15 -0800 | [diff] [blame] | 898 | timer->it_signal = NULL; |
Oleg Nesterov | 4b7a130 | 2008-07-25 01:47:26 -0700 | [diff] [blame] | 899 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 900 | unlock_timer(timer, flags); |
| 901 | release_posix_timer(timer, IT_ID_SET); |
| 902 | } |
| 903 | |
| 904 | /* |
Roland McGrath | 25f407f | 2005-10-21 15:03:29 -0700 | [diff] [blame] | 905 | * This is called by do_exit or de_thread, only when there are no more |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 906 | * references to the shared signal_struct. |
| 907 | */ |
| 908 | void exit_itimers(struct signal_struct *sig) |
| 909 | { |
| 910 | struct k_itimer *tmr; |
| 911 | |
| 912 | while (!list_empty(&sig->posix_timers)) { |
| 913 | tmr = list_entry(sig->posix_timers.next, struct k_itimer, list); |
| 914 | itimer_delete(tmr); |
| 915 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 916 | } |
| 917 | |
Heiko Carstens | 362e9c0 | 2009-01-14 14:14:07 +0100 | [diff] [blame] | 918 | SYSCALL_DEFINE2(clock_settime, const clockid_t, which_clock, |
| 919 | const struct timespec __user *, tp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 920 | { |
Thomas Gleixner | 26f9a47 | 2011-02-01 13:51:48 +0000 | [diff] [blame] | 921 | struct k_clock *kc = clockid_to_kclock(which_clock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 922 | struct timespec new_tp; |
| 923 | |
Thomas Gleixner | 26f9a47 | 2011-02-01 13:51:48 +0000 | [diff] [blame] | 924 | if (!kc || !kc->clock_set) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 925 | return -EINVAL; |
Thomas Gleixner | 26f9a47 | 2011-02-01 13:51:48 +0000 | [diff] [blame] | 926 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 927 | if (copy_from_user(&new_tp, tp, sizeof (*tp))) |
| 928 | return -EFAULT; |
| 929 | |
Thomas Gleixner | 26f9a47 | 2011-02-01 13:51:48 +0000 | [diff] [blame] | 930 | return kc->clock_set(which_clock, &new_tp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 931 | } |
| 932 | |
Heiko Carstens | 362e9c0 | 2009-01-14 14:14:07 +0100 | [diff] [blame] | 933 | SYSCALL_DEFINE2(clock_gettime, const clockid_t, which_clock, |
| 934 | struct timespec __user *,tp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 935 | { |
Thomas Gleixner | 4228577 | 2011-02-01 13:51:50 +0000 | [diff] [blame] | 936 | struct k_clock *kc = clockid_to_kclock(which_clock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 937 | struct timespec kernel_tp; |
| 938 | int error; |
| 939 | |
Thomas Gleixner | 4228577 | 2011-02-01 13:51:50 +0000 | [diff] [blame] | 940 | if (!kc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 941 | return -EINVAL; |
Thomas Gleixner | 4228577 | 2011-02-01 13:51:50 +0000 | [diff] [blame] | 942 | |
| 943 | error = kc->clock_get(which_clock, &kernel_tp); |
| 944 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 945 | if (!error && copy_to_user(tp, &kernel_tp, sizeof (kernel_tp))) |
| 946 | error = -EFAULT; |
| 947 | |
| 948 | return error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 949 | } |
| 950 | |
Heiko Carstens | 362e9c0 | 2009-01-14 14:14:07 +0100 | [diff] [blame] | 951 | SYSCALL_DEFINE2(clock_getres, const clockid_t, which_clock, |
| 952 | struct timespec __user *, tp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 953 | { |
Thomas Gleixner | e5e542e | 2011-02-01 13:51:53 +0000 | [diff] [blame] | 954 | struct k_clock *kc = clockid_to_kclock(which_clock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 955 | struct timespec rtn_tp; |
| 956 | int error; |
| 957 | |
Thomas Gleixner | e5e542e | 2011-02-01 13:51:53 +0000 | [diff] [blame] | 958 | if (!kc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 959 | return -EINVAL; |
| 960 | |
Thomas Gleixner | e5e542e | 2011-02-01 13:51:53 +0000 | [diff] [blame] | 961 | error = kc->clock_getres(which_clock, &rtn_tp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 962 | |
Thomas Gleixner | e5e542e | 2011-02-01 13:51:53 +0000 | [diff] [blame] | 963 | if (!error && tp && copy_to_user(tp, &rtn_tp, sizeof (rtn_tp))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 964 | error = -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 965 | |
| 966 | return error; |
| 967 | } |
| 968 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 969 | /* |
Thomas Gleixner | 97735f2 | 2006-01-09 20:52:37 -0800 | [diff] [blame] | 970 | * nanosleep for monotonic and realtime clocks |
| 971 | */ |
| 972 | static int common_nsleep(const clockid_t which_clock, int flags, |
| 973 | struct timespec *tsave, struct timespec __user *rmtp) |
| 974 | { |
Oleg Nesterov | 080344b | 2008-02-01 17:29:05 +0300 | [diff] [blame] | 975 | return hrtimer_nanosleep(tsave, rmtp, flags & TIMER_ABSTIME ? |
| 976 | HRTIMER_MODE_ABS : HRTIMER_MODE_REL, |
| 977 | which_clock); |
Thomas Gleixner | 97735f2 | 2006-01-09 20:52:37 -0800 | [diff] [blame] | 978 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 979 | |
Heiko Carstens | 362e9c0 | 2009-01-14 14:14:07 +0100 | [diff] [blame] | 980 | SYSCALL_DEFINE4(clock_nanosleep, const clockid_t, which_clock, int, flags, |
| 981 | const struct timespec __user *, rqtp, |
| 982 | struct timespec __user *, rmtp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 983 | { |
Thomas Gleixner | a5cd288 | 2011-02-01 13:51:11 +0000 | [diff] [blame] | 984 | struct k_clock *kc = clockid_to_kclock(which_clock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 985 | struct timespec t; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 986 | |
Thomas Gleixner | a5cd288 | 2011-02-01 13:51:11 +0000 | [diff] [blame] | 987 | if (!kc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 988 | return -EINVAL; |
Thomas Gleixner | a5cd288 | 2011-02-01 13:51:11 +0000 | [diff] [blame] | 989 | if (!kc->nsleep) |
| 990 | return -ENANOSLEEP_NOTSUP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 991 | |
| 992 | if (copy_from_user(&t, rqtp, sizeof (struct timespec))) |
| 993 | return -EFAULT; |
| 994 | |
Thomas Gleixner | 5f82b2b | 2006-01-09 20:52:29 -0800 | [diff] [blame] | 995 | if (!timespec_valid(&t)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 996 | return -EINVAL; |
| 997 | |
Thomas Gleixner | a5cd288 | 2011-02-01 13:51:11 +0000 | [diff] [blame] | 998 | return kc->nsleep(which_clock, flags, &t, rmtp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 999 | } |
Toyo Abe | 1711ef3 | 2006-09-29 02:00:28 -0700 | [diff] [blame] | 1000 | |
| 1001 | /* |
Toyo Abe | 1711ef3 | 2006-09-29 02:00:28 -0700 | [diff] [blame] | 1002 | * This will restart clock_nanosleep. This is required only by |
| 1003 | * compat_clock_nanosleep_restart for now. |
| 1004 | */ |
Thomas Gleixner | 59bd5bc | 2011-02-01 13:51:17 +0000 | [diff] [blame] | 1005 | long clock_nanosleep_restart(struct restart_block *restart_block) |
Toyo Abe | 1711ef3 | 2006-09-29 02:00:28 -0700 | [diff] [blame] | 1006 | { |
Thomas Gleixner | 3751f9f | 2011-02-01 13:51:20 +0000 | [diff] [blame] | 1007 | clockid_t which_clock = restart_block->nanosleep.index; |
Thomas Gleixner | 59bd5bc | 2011-02-01 13:51:17 +0000 | [diff] [blame] | 1008 | struct k_clock *kc = clockid_to_kclock(which_clock); |
Toyo Abe | 1711ef3 | 2006-09-29 02:00:28 -0700 | [diff] [blame] | 1009 | |
Thomas Gleixner | 59bd5bc | 2011-02-01 13:51:17 +0000 | [diff] [blame] | 1010 | if (WARN_ON_ONCE(!kc || !kc->nsleep_restart)) |
| 1011 | return -EINVAL; |
| 1012 | |
| 1013 | return kc->nsleep_restart(restart_block); |
Toyo Abe | 1711ef3 | 2006-09-29 02:00:28 -0700 | [diff] [blame] | 1014 | } |