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 | |
Richard Cochran | f1f1d5e | 2011-02-01 13:52:26 +0000 | [diff] [blame] | 173 | static int posix_clock_realtime_adj(const clockid_t which_clock, |
| 174 | struct timex *t) |
| 175 | { |
| 176 | return do_adjtimex(t); |
| 177 | } |
| 178 | |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 179 | /* |
| 180 | * Get monotonic time for posix timers |
| 181 | */ |
| 182 | static int posix_ktime_get_ts(clockid_t which_clock, struct timespec *tp) |
| 183 | { |
| 184 | ktime_get_ts(tp); |
| 185 | return 0; |
| 186 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 187 | |
| 188 | /* |
John Stultz | 2d42244 | 2008-08-20 16:37:30 -0700 | [diff] [blame] | 189 | * Get monotonic time for posix timers |
| 190 | */ |
| 191 | static int posix_get_monotonic_raw(clockid_t which_clock, struct timespec *tp) |
| 192 | { |
| 193 | getrawmonotonic(tp); |
| 194 | return 0; |
| 195 | } |
| 196 | |
john stultz | da15cfd | 2009-08-19 19:13:34 -0700 | [diff] [blame] | 197 | |
| 198 | static int posix_get_realtime_coarse(clockid_t which_clock, struct timespec *tp) |
| 199 | { |
| 200 | *tp = current_kernel_time(); |
| 201 | return 0; |
| 202 | } |
| 203 | |
| 204 | static int posix_get_monotonic_coarse(clockid_t which_clock, |
| 205 | struct timespec *tp) |
| 206 | { |
| 207 | *tp = get_monotonic_coarse(); |
| 208 | return 0; |
| 209 | } |
| 210 | |
H Hartley Sweeten | 6622e67 | 2010-02-02 14:41:42 -0800 | [diff] [blame] | 211 | 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] | 212 | { |
| 213 | *tp = ktime_to_timespec(KTIME_LOW_RES); |
| 214 | return 0; |
| 215 | } |
John Stultz | 2d42244 | 2008-08-20 16:37:30 -0700 | [diff] [blame] | 216 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 217 | * Initialize everything, well, just everything in Posix clocks/timers ;) |
| 218 | */ |
| 219 | static __init int init_posix_timers(void) |
| 220 | { |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 221 | struct k_clock clock_realtime = { |
Thomas Gleixner | 2fd1f04 | 2011-02-01 13:51:03 +0000 | [diff] [blame] | 222 | .clock_getres = hrtimer_get_res, |
Thomas Gleixner | 4228577 | 2011-02-01 13:51:50 +0000 | [diff] [blame] | 223 | .clock_get = posix_clock_realtime_get, |
Thomas Gleixner | 26f9a47 | 2011-02-01 13:51:48 +0000 | [diff] [blame] | 224 | .clock_set = posix_clock_realtime_set, |
Richard Cochran | f1f1d5e | 2011-02-01 13:52:26 +0000 | [diff] [blame] | 225 | .clock_adj = posix_clock_realtime_adj, |
Thomas Gleixner | a5cd288 | 2011-02-01 13:51:11 +0000 | [diff] [blame] | 226 | .nsleep = common_nsleep, |
Thomas Gleixner | 59bd5bc | 2011-02-01 13:51:17 +0000 | [diff] [blame] | 227 | .nsleep_restart = hrtimer_nanosleep_restart, |
Thomas Gleixner | 838394f | 2011-02-01 13:51:58 +0000 | [diff] [blame] | 228 | .timer_create = common_timer_create, |
Thomas Gleixner | 27722df | 2011-02-01 13:52:01 +0000 | [diff] [blame] | 229 | .timer_set = common_timer_set, |
Thomas Gleixner | a7319fa | 2011-02-01 13:52:04 +0000 | [diff] [blame] | 230 | .timer_get = common_timer_get, |
Thomas Gleixner | 6761c67 | 2011-02-01 13:52:07 +0000 | [diff] [blame] | 231 | .timer_del = common_timer_del, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 232 | }; |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 233 | struct k_clock clock_monotonic = { |
Thomas Gleixner | 2fd1f04 | 2011-02-01 13:51:03 +0000 | [diff] [blame] | 234 | .clock_getres = hrtimer_get_res, |
| 235 | .clock_get = posix_ktime_get_ts, |
Thomas Gleixner | a5cd288 | 2011-02-01 13:51:11 +0000 | [diff] [blame] | 236 | .nsleep = common_nsleep, |
Thomas Gleixner | 59bd5bc | 2011-02-01 13:51:17 +0000 | [diff] [blame] | 237 | .nsleep_restart = hrtimer_nanosleep_restart, |
Thomas Gleixner | 838394f | 2011-02-01 13:51:58 +0000 | [diff] [blame] | 238 | .timer_create = common_timer_create, |
Thomas Gleixner | 27722df | 2011-02-01 13:52:01 +0000 | [diff] [blame] | 239 | .timer_set = common_timer_set, |
Thomas Gleixner | a7319fa | 2011-02-01 13:52:04 +0000 | [diff] [blame] | 240 | .timer_get = common_timer_get, |
Thomas Gleixner | 6761c67 | 2011-02-01 13:52:07 +0000 | [diff] [blame] | 241 | .timer_del = common_timer_del, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 242 | }; |
John Stultz | 2d42244 | 2008-08-20 16:37:30 -0700 | [diff] [blame] | 243 | struct k_clock clock_monotonic_raw = { |
Thomas Gleixner | 2fd1f04 | 2011-02-01 13:51:03 +0000 | [diff] [blame] | 244 | .clock_getres = hrtimer_get_res, |
| 245 | .clock_get = posix_get_monotonic_raw, |
John Stultz | 2d42244 | 2008-08-20 16:37:30 -0700 | [diff] [blame] | 246 | }; |
john stultz | da15cfd | 2009-08-19 19:13:34 -0700 | [diff] [blame] | 247 | struct k_clock clock_realtime_coarse = { |
Thomas Gleixner | 2fd1f04 | 2011-02-01 13:51:03 +0000 | [diff] [blame] | 248 | .clock_getres = posix_get_coarse_res, |
| 249 | .clock_get = posix_get_realtime_coarse, |
john stultz | da15cfd | 2009-08-19 19:13:34 -0700 | [diff] [blame] | 250 | }; |
| 251 | struct k_clock clock_monotonic_coarse = { |
Thomas Gleixner | 2fd1f04 | 2011-02-01 13:51:03 +0000 | [diff] [blame] | 252 | .clock_getres = posix_get_coarse_res, |
| 253 | .clock_get = posix_get_monotonic_coarse, |
john stultz | da15cfd | 2009-08-19 19:13:34 -0700 | [diff] [blame] | 254 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 255 | |
Thomas Gleixner | 5270873 | 2011-02-02 12:10:09 +0100 | [diff] [blame^] | 256 | posix_timers_register_clock(CLOCK_REALTIME, &clock_realtime); |
| 257 | posix_timers_register_clock(CLOCK_MONOTONIC, &clock_monotonic); |
| 258 | posix_timers_register_clock(CLOCK_MONOTONIC_RAW, &clock_monotonic_raw); |
| 259 | posix_timers_register_clock(CLOCK_REALTIME_COARSE, &clock_realtime_coarse); |
| 260 | posix_timers_register_clock(CLOCK_MONOTONIC_COARSE, &clock_monotonic_coarse); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 261 | |
| 262 | posix_timers_cache = kmem_cache_create("posix_timers_cache", |
Alexey Dobriyan | 040b5c6 | 2007-10-16 23:26:10 -0700 | [diff] [blame] | 263 | sizeof (struct k_itimer), 0, SLAB_PANIC, |
| 264 | NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 265 | idr_init(&posix_timers_id); |
| 266 | return 0; |
| 267 | } |
| 268 | |
| 269 | __initcall(init_posix_timers); |
| 270 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 271 | static void schedule_next_timer(struct k_itimer *timr) |
| 272 | { |
Roman Zippel | 44f2147 | 2006-03-26 01:38:06 -0800 | [diff] [blame] | 273 | struct hrtimer *timer = &timr->it.real.timer; |
| 274 | |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 275 | if (timr->it.real.interval.tv64 == 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 276 | return; |
| 277 | |
Davide Libenzi | 4d672e7 | 2008-02-04 22:27:26 -0800 | [diff] [blame] | 278 | timr->it_overrun += (unsigned int) hrtimer_forward(timer, |
| 279 | timer->base->get_time(), |
| 280 | timr->it.real.interval); |
Roman Zippel | 44f2147 | 2006-03-26 01:38:06 -0800 | [diff] [blame] | 281 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 282 | timr->it_overrun_last = timr->it_overrun; |
| 283 | timr->it_overrun = -1; |
| 284 | ++timr->it_requeue_pending; |
Roman Zippel | 44f2147 | 2006-03-26 01:38:06 -0800 | [diff] [blame] | 285 | hrtimer_restart(timer); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 286 | } |
| 287 | |
| 288 | /* |
| 289 | * This function is exported for use by the signal deliver code. It is |
| 290 | * called just prior to the info block being released and passes that |
| 291 | * block to us. It's function is to update the overrun entry AND to |
| 292 | * restart the timer. It should only be called if the timer is to be |
| 293 | * restarted (i.e. we have flagged this in the sys_private entry of the |
| 294 | * info block). |
| 295 | * |
| 296 | * To protect aginst the timer going away while the interrupt is queued, |
| 297 | * we require that the it_requeue_pending flag be set. |
| 298 | */ |
| 299 | void do_schedule_next_timer(struct siginfo *info) |
| 300 | { |
| 301 | struct k_itimer *timr; |
| 302 | unsigned long flags; |
| 303 | |
| 304 | timr = lock_timer(info->si_tid, &flags); |
| 305 | |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 306 | if (timr && timr->it_requeue_pending == info->si_sys_private) { |
| 307 | if (timr->it_clock < 0) |
| 308 | posix_cpu_timer_schedule(timr); |
| 309 | else |
| 310 | schedule_next_timer(timr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 311 | |
Oleg Nesterov | 54da117 | 2008-07-23 20:52:05 +0400 | [diff] [blame] | 312 | info->si_overrun += timr->it_overrun_last; |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 313 | } |
| 314 | |
Thomas Gleixner | b6557fb | 2006-02-01 03:05:09 -0800 | [diff] [blame] | 315 | if (timr) |
| 316 | unlock_timer(timr, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 317 | } |
| 318 | |
Oleg Nesterov | ba66129 | 2008-07-23 20:52:05 +0400 | [diff] [blame] | 319 | int posix_timer_event(struct k_itimer *timr, int si_private) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 320 | { |
Oleg Nesterov | 27af424 | 2008-12-01 14:18:13 -0800 | [diff] [blame] | 321 | struct task_struct *task; |
| 322 | int shared, ret = -1; |
Oleg Nesterov | ba66129 | 2008-07-23 20:52:05 +0400 | [diff] [blame] | 323 | /* |
| 324 | * FIXME: if ->sigq is queued we can race with |
| 325 | * dequeue_signal()->do_schedule_next_timer(). |
| 326 | * |
| 327 | * If dequeue_signal() sees the "right" value of |
| 328 | * si_sys_private it calls do_schedule_next_timer(). |
| 329 | * We re-queue ->sigq and drop ->it_lock(). |
| 330 | * do_schedule_next_timer() locks the timer |
| 331 | * and re-schedules it while ->sigq is pending. |
| 332 | * Not really bad, but not that we want. |
| 333 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 334 | timr->sigq->info.si_sys_private = si_private; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 335 | |
Oleg Nesterov | 27af424 | 2008-12-01 14:18:13 -0800 | [diff] [blame] | 336 | rcu_read_lock(); |
| 337 | task = pid_task(timr->it_pid, PIDTYPE_PID); |
| 338 | if (task) { |
| 339 | shared = !(timr->it_sigev_notify & SIGEV_THREAD_ID); |
| 340 | ret = send_sigqueue(timr->sigq, task, shared); |
| 341 | } |
| 342 | rcu_read_unlock(); |
Oleg Nesterov | 4aa7361 | 2008-09-22 14:42:46 -0700 | [diff] [blame] | 343 | /* If we failed to send the signal the timer stops. */ |
| 344 | return ret > 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 345 | } |
| 346 | EXPORT_SYMBOL_GPL(posix_timer_event); |
| 347 | |
| 348 | /* |
| 349 | * This function gets called when a POSIX.1b interval timer expires. It |
| 350 | * is used as a callback from the kernel internal timer. The |
| 351 | * run_timer_list code ALWAYS calls with interrupts on. |
| 352 | |
| 353 | * This code is for CLOCK_REALTIME* and CLOCK_MONOTONIC* timers. |
| 354 | */ |
Thomas Gleixner | c9cb2e3 | 2007-02-16 01:27:49 -0800 | [diff] [blame] | 355 | static enum hrtimer_restart posix_timer_fn(struct hrtimer *timer) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 356 | { |
Roman Zippel | 05cfb61 | 2006-03-26 01:38:12 -0800 | [diff] [blame] | 357 | struct k_itimer *timr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 358 | unsigned long flags; |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 359 | int si_private = 0; |
Thomas Gleixner | c9cb2e3 | 2007-02-16 01:27:49 -0800 | [diff] [blame] | 360 | enum hrtimer_restart ret = HRTIMER_NORESTART; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 361 | |
Roman Zippel | 05cfb61 | 2006-03-26 01:38:12 -0800 | [diff] [blame] | 362 | timr = container_of(timer, struct k_itimer, it.real.timer); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 363 | spin_lock_irqsave(&timr->it_lock, flags); |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 364 | |
| 365 | if (timr->it.real.interval.tv64 != 0) |
| 366 | si_private = ++timr->it_requeue_pending; |
| 367 | |
| 368 | if (posix_timer_event(timr, si_private)) { |
| 369 | /* |
| 370 | * signal was not sent because of sig_ignor |
| 371 | * we will not get a call back to restart it AND |
| 372 | * it should be restarted. |
| 373 | */ |
| 374 | if (timr->it.real.interval.tv64 != 0) { |
Thomas Gleixner | 58229a1 | 2007-06-21 20:45:15 +0000 | [diff] [blame] | 375 | ktime_t now = hrtimer_cb_get_time(timer); |
| 376 | |
| 377 | /* |
| 378 | * FIXME: What we really want, is to stop this |
| 379 | * timer completely and restart it in case the |
| 380 | * SIG_IGN is removed. This is a non trivial |
| 381 | * change which involves sighand locking |
| 382 | * (sigh !), which we don't want to do late in |
| 383 | * the release cycle. |
| 384 | * |
| 385 | * For now we just let timers with an interval |
| 386 | * less than a jiffie expire every jiffie to |
| 387 | * avoid softirq starvation in case of SIG_IGN |
| 388 | * and a very small interval, which would put |
| 389 | * the timer right back on the softirq pending |
| 390 | * list. By moving now ahead of time we trick |
| 391 | * hrtimer_forward() to expire the timer |
| 392 | * later, while we still maintain the overrun |
| 393 | * accuracy, but have some inconsistency in |
| 394 | * the timer_gettime() case. This is at least |
| 395 | * better than a starved softirq. A more |
| 396 | * complex fix which solves also another related |
| 397 | * inconsistency is already in the pipeline. |
| 398 | */ |
| 399 | #ifdef CONFIG_HIGH_RES_TIMERS |
| 400 | { |
| 401 | ktime_t kj = ktime_set(0, NSEC_PER_SEC / HZ); |
| 402 | |
| 403 | if (timr->it.real.interval.tv64 < kj.tv64) |
| 404 | now = ktime_add(now, kj); |
| 405 | } |
| 406 | #endif |
Davide Libenzi | 4d672e7 | 2008-02-04 22:27:26 -0800 | [diff] [blame] | 407 | timr->it_overrun += (unsigned int) |
Thomas Gleixner | 58229a1 | 2007-06-21 20:45:15 +0000 | [diff] [blame] | 408 | hrtimer_forward(timer, now, |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 409 | timr->it.real.interval); |
| 410 | ret = HRTIMER_RESTART; |
Roman Zippel | a0a0c28 | 2006-03-16 23:04:01 -0800 | [diff] [blame] | 411 | ++timr->it_requeue_pending; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 412 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 413 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 414 | |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 415 | unlock_timer(timr, flags); |
| 416 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 417 | } |
| 418 | |
Oleg Nesterov | 27af424 | 2008-12-01 14:18:13 -0800 | [diff] [blame] | 419 | static struct pid *good_sigevent(sigevent_t * event) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 420 | { |
| 421 | struct task_struct *rtn = current->group_leader; |
| 422 | |
| 423 | if ((event->sigev_notify & SIGEV_THREAD_ID ) && |
Pavel Emelyanov | 8dc86af | 2008-02-08 04:21:52 -0800 | [diff] [blame] | 424 | (!(rtn = find_task_by_vpid(event->sigev_notify_thread_id)) || |
Pavel Emelyanov | bac0abd | 2007-10-18 23:40:18 -0700 | [diff] [blame] | 425 | !same_thread_group(rtn, current) || |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 426 | (event->sigev_notify & ~SIGEV_THREAD_ID) != SIGEV_SIGNAL)) |
| 427 | return NULL; |
| 428 | |
| 429 | if (((event->sigev_notify & ~SIGEV_THREAD_ID) != SIGEV_NONE) && |
| 430 | ((event->sigev_signo <= 0) || (event->sigev_signo > SIGRTMAX))) |
| 431 | return NULL; |
| 432 | |
Oleg Nesterov | 27af424 | 2008-12-01 14:18:13 -0800 | [diff] [blame] | 433 | return task_pid(rtn); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 434 | } |
| 435 | |
Thomas Gleixner | 5270873 | 2011-02-02 12:10:09 +0100 | [diff] [blame^] | 436 | void posix_timers_register_clock(const clockid_t clock_id, |
| 437 | struct k_clock *new_clock) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 438 | { |
| 439 | if ((unsigned) clock_id >= MAX_CLOCKS) { |
Thomas Gleixner | 4359ac0 | 2011-02-02 11:45:23 +0100 | [diff] [blame] | 440 | printk(KERN_WARNING "POSIX clock register failed for clock_id %d\n", |
| 441 | clock_id); |
| 442 | return; |
| 443 | } |
| 444 | |
| 445 | if (!new_clock->clock_get) { |
| 446 | printk(KERN_WARNING "POSIX clock id %d lacks clock_get()\n", |
| 447 | clock_id); |
| 448 | return; |
| 449 | } |
| 450 | if (!new_clock->clock_getres) { |
| 451 | printk(KERN_WARNING "POSIX clock id %d lacks clock_getres()\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 452 | clock_id); |
| 453 | return; |
| 454 | } |
| 455 | |
| 456 | posix_clocks[clock_id] = *new_clock; |
| 457 | } |
Thomas Gleixner | 5270873 | 2011-02-02 12:10:09 +0100 | [diff] [blame^] | 458 | EXPORT_SYMBOL_GPL(posix_timers_register_clock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 459 | |
| 460 | static struct k_itimer * alloc_posix_timer(void) |
| 461 | { |
| 462 | struct k_itimer *tmr; |
Robert P. J. Day | c376222 | 2007-02-10 01:45:03 -0800 | [diff] [blame] | 463 | tmr = kmem_cache_zalloc(posix_timers_cache, GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 464 | if (!tmr) |
| 465 | return tmr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 466 | if (unlikely(!(tmr->sigq = sigqueue_alloc()))) { |
| 467 | kmem_cache_free(posix_timers_cache, tmr); |
Dan Carpenter | aa94fbd | 2008-10-02 14:50:14 -0700 | [diff] [blame] | 468 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 469 | } |
Oleg Nesterov | ba66129 | 2008-07-23 20:52:05 +0400 | [diff] [blame] | 470 | memset(&tmr->sigq->info, 0, sizeof(siginfo_t)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 471 | return tmr; |
| 472 | } |
| 473 | |
| 474 | #define IT_ID_SET 1 |
| 475 | #define IT_ID_NOT_SET 0 |
| 476 | static void release_posix_timer(struct k_itimer *tmr, int it_id_set) |
| 477 | { |
| 478 | if (it_id_set) { |
| 479 | unsigned long flags; |
| 480 | spin_lock_irqsave(&idr_lock, flags); |
| 481 | idr_remove(&posix_timers_id, tmr->it_id); |
| 482 | spin_unlock_irqrestore(&idr_lock, flags); |
| 483 | } |
Oleg Nesterov | 8999210 | 2008-12-01 14:18:15 -0800 | [diff] [blame] | 484 | put_pid(tmr->it_pid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 485 | sigqueue_free(tmr->sigq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 486 | kmem_cache_free(posix_timers_cache, tmr); |
| 487 | } |
| 488 | |
Thomas Gleixner | cc785ac | 2011-02-01 13:51:09 +0000 | [diff] [blame] | 489 | static struct k_clock *clockid_to_kclock(const clockid_t id) |
| 490 | { |
| 491 | if (id < 0) |
Richard Cochran | 81e294c | 2011-02-01 13:52:32 +0000 | [diff] [blame] | 492 | return (id & CLOCKFD_MASK) == CLOCKFD ? NULL : &clock_posix_cpu; |
Thomas Gleixner | cc785ac | 2011-02-01 13:51:09 +0000 | [diff] [blame] | 493 | |
| 494 | if (id >= MAX_CLOCKS || !posix_clocks[id].clock_getres) |
| 495 | return NULL; |
| 496 | return &posix_clocks[id]; |
| 497 | } |
| 498 | |
Thomas Gleixner | 838394f | 2011-02-01 13:51:58 +0000 | [diff] [blame] | 499 | static int common_timer_create(struct k_itimer *new_timer) |
| 500 | { |
| 501 | hrtimer_init(&new_timer->it.real.timer, new_timer->it_clock, 0); |
| 502 | return 0; |
| 503 | } |
| 504 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 505 | /* Create a POSIX.1b interval timer. */ |
| 506 | |
Heiko Carstens | 362e9c0 | 2009-01-14 14:14:07 +0100 | [diff] [blame] | 507 | SYSCALL_DEFINE3(timer_create, const clockid_t, which_clock, |
| 508 | struct sigevent __user *, timer_event_spec, |
| 509 | timer_t __user *, created_timer_id) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 510 | { |
Thomas Gleixner | 838394f | 2011-02-01 13:51:58 +0000 | [diff] [blame] | 511 | struct k_clock *kc = clockid_to_kclock(which_clock); |
Oleg Nesterov | 2cd499e | 2008-09-22 14:42:47 -0700 | [diff] [blame] | 512 | struct k_itimer *new_timer; |
Oleg Nesterov | ef864c9 | 2008-09-22 14:42:49 -0700 | [diff] [blame] | 513 | int error, new_timer_id; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 514 | sigevent_t event; |
| 515 | int it_id_set = IT_ID_NOT_SET; |
| 516 | |
Thomas Gleixner | 838394f | 2011-02-01 13:51:58 +0000 | [diff] [blame] | 517 | if (!kc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 518 | return -EINVAL; |
Thomas Gleixner | 838394f | 2011-02-01 13:51:58 +0000 | [diff] [blame] | 519 | if (!kc->timer_create) |
| 520 | return -EOPNOTSUPP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 521 | |
| 522 | new_timer = alloc_posix_timer(); |
| 523 | if (unlikely(!new_timer)) |
| 524 | return -EAGAIN; |
| 525 | |
| 526 | spin_lock_init(&new_timer->it_lock); |
| 527 | retry: |
| 528 | if (unlikely(!idr_pre_get(&posix_timers_id, GFP_KERNEL))) { |
| 529 | error = -EAGAIN; |
| 530 | goto out; |
| 531 | } |
| 532 | spin_lock_irq(&idr_lock); |
Oleg Nesterov | 5a51b71 | 2008-09-22 14:42:51 -0700 | [diff] [blame] | 533 | error = idr_get_new(&posix_timers_id, new_timer, &new_timer_id); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 534 | spin_unlock_irq(&idr_lock); |
Oleg Nesterov | ef864c9 | 2008-09-22 14:42:49 -0700 | [diff] [blame] | 535 | if (error) { |
| 536 | if (error == -EAGAIN) |
| 537 | goto retry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 538 | /* |
Joe Perches | 0b0a3e7 | 2008-02-03 17:48:04 +0200 | [diff] [blame] | 539 | * Weird looking, but we return EAGAIN if the IDR is |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 540 | * full (proper POSIX return value for this) |
| 541 | */ |
| 542 | error = -EAGAIN; |
| 543 | goto out; |
| 544 | } |
| 545 | |
| 546 | it_id_set = IT_ID_SET; |
| 547 | new_timer->it_id = (timer_t) new_timer_id; |
| 548 | new_timer->it_clock = which_clock; |
| 549 | new_timer->it_overrun = -1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 550 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 551 | if (timer_event_spec) { |
| 552 | if (copy_from_user(&event, timer_event_spec, sizeof (event))) { |
| 553 | error = -EFAULT; |
| 554 | goto out; |
| 555 | } |
Oleg Nesterov | 36b2f04 | 2008-09-22 14:42:48 -0700 | [diff] [blame] | 556 | rcu_read_lock(); |
Oleg Nesterov | 8999210 | 2008-12-01 14:18:15 -0800 | [diff] [blame] | 557 | new_timer->it_pid = get_pid(good_sigevent(&event)); |
Oleg Nesterov | 36b2f04 | 2008-09-22 14:42:48 -0700 | [diff] [blame] | 558 | rcu_read_unlock(); |
Oleg Nesterov | 8999210 | 2008-12-01 14:18:15 -0800 | [diff] [blame] | 559 | if (!new_timer->it_pid) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 560 | error = -EINVAL; |
| 561 | goto out; |
| 562 | } |
| 563 | } else { |
Oleg Nesterov | 5a9fa73 | 2008-09-22 14:42:50 -0700 | [diff] [blame] | 564 | event.sigev_notify = SIGEV_SIGNAL; |
| 565 | event.sigev_signo = SIGALRM; |
| 566 | event.sigev_value.sival_int = new_timer->it_id; |
Oleg Nesterov | 8999210 | 2008-12-01 14:18:15 -0800 | [diff] [blame] | 567 | new_timer->it_pid = get_pid(task_tgid(current)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 568 | } |
| 569 | |
Oleg Nesterov | 5a9fa73 | 2008-09-22 14:42:50 -0700 | [diff] [blame] | 570 | new_timer->it_sigev_notify = event.sigev_notify; |
| 571 | new_timer->sigq->info.si_signo = event.sigev_signo; |
| 572 | new_timer->sigq->info.si_value = event.sigev_value; |
Oleg Nesterov | 717835d | 2008-09-22 14:42:49 -0700 | [diff] [blame] | 573 | new_timer->sigq->info.si_tid = new_timer->it_id; |
Oleg Nesterov | 5a9fa73 | 2008-09-22 14:42:50 -0700 | [diff] [blame] | 574 | new_timer->sigq->info.si_code = SI_TIMER; |
Oleg Nesterov | 717835d | 2008-09-22 14:42:49 -0700 | [diff] [blame] | 575 | |
Andrey Vagin | 2b08de0 | 2010-07-20 15:23:14 -0700 | [diff] [blame] | 576 | if (copy_to_user(created_timer_id, |
| 577 | &new_timer_id, sizeof (new_timer_id))) { |
| 578 | error = -EFAULT; |
| 579 | goto out; |
| 580 | } |
| 581 | |
Thomas Gleixner | 838394f | 2011-02-01 13:51:58 +0000 | [diff] [blame] | 582 | error = kc->timer_create(new_timer); |
Andrey Vagin | 45e0fff | 2010-05-24 12:15:33 -0700 | [diff] [blame] | 583 | if (error) |
| 584 | goto out; |
| 585 | |
Oleg Nesterov | 36b2f04 | 2008-09-22 14:42:48 -0700 | [diff] [blame] | 586 | spin_lock_irq(¤t->sighand->siglock); |
Oleg Nesterov | 27af424 | 2008-12-01 14:18:13 -0800 | [diff] [blame] | 587 | new_timer->it_signal = current->signal; |
Oleg Nesterov | 36b2f04 | 2008-09-22 14:42:48 -0700 | [diff] [blame] | 588 | list_add(&new_timer->list, ¤t->signal->posix_timers); |
| 589 | spin_unlock_irq(¤t->sighand->siglock); |
Oleg Nesterov | ef864c9 | 2008-09-22 14:42:49 -0700 | [diff] [blame] | 590 | |
| 591 | return 0; |
Thomas Gleixner | 838394f | 2011-02-01 13:51:58 +0000 | [diff] [blame] | 592 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 593 | * In the case of the timer belonging to another task, after |
| 594 | * the task is unlocked, the timer is owned by the other task |
| 595 | * and may cease to exist at any time. Don't use or modify |
| 596 | * new_timer after the unlock call. |
| 597 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 598 | out: |
Oleg Nesterov | ef864c9 | 2008-09-22 14:42:49 -0700 | [diff] [blame] | 599 | release_posix_timer(new_timer, it_id_set); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 600 | return error; |
| 601 | } |
| 602 | |
| 603 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 604 | * Locking issues: We need to protect the result of the id look up until |
| 605 | * we get the timer locked down so it is not deleted under us. The |
| 606 | * removal is done under the idr spinlock so we use that here to bridge |
| 607 | * the find to the timer lock. To avoid a dead lock, the timer id MUST |
| 608 | * be release with out holding the timer lock. |
| 609 | */ |
Namhyung Kim | 20f33a0 | 2010-10-20 15:57:34 -0700 | [diff] [blame] | 610 | 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] | 611 | { |
| 612 | struct k_itimer *timr; |
| 613 | /* |
| 614 | * Watch out here. We do a irqsave on the idr_lock and pass the |
| 615 | * flags part over to the timer lock. Must not let interrupts in |
| 616 | * while we are moving the lock. |
| 617 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 618 | spin_lock_irqsave(&idr_lock, *flags); |
Oleg Nesterov | 31d9284 | 2008-09-22 14:42:51 -0700 | [diff] [blame] | 619 | timr = idr_find(&posix_timers_id, (int)timer_id); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 620 | if (timr) { |
| 621 | spin_lock(&timr->it_lock); |
Oleg Nesterov | 8999210 | 2008-12-01 14:18:15 -0800 | [diff] [blame] | 622 | if (timr->it_signal == current->signal) { |
Thomas Gleixner | 179394a | 2007-08-22 14:01:37 -0700 | [diff] [blame] | 623 | spin_unlock(&idr_lock); |
Oleg Nesterov | 31d9284 | 2008-09-22 14:42:51 -0700 | [diff] [blame] | 624 | return timr; |
| 625 | } |
| 626 | spin_unlock(&timr->it_lock); |
| 627 | } |
| 628 | spin_unlock_irqrestore(&idr_lock, *flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 629 | |
Oleg Nesterov | 31d9284 | 2008-09-22 14:42:51 -0700 | [diff] [blame] | 630 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 631 | } |
| 632 | |
| 633 | /* |
| 634 | * Get the time remaining on a POSIX.1b interval timer. This function |
| 635 | * is ALWAYS called with spin_lock_irq on the timer, thus it must not |
| 636 | * mess with irq. |
| 637 | * |
| 638 | * We have a couple of messes to clean up here. First there is the case |
| 639 | * of a timer that has a requeue pending. These timers should appear to |
| 640 | * be in the timer list with an expiry as if we were to requeue them |
| 641 | * now. |
| 642 | * |
| 643 | * The second issue is the SIGEV_NONE timer which may be active but is |
| 644 | * not really ever put in the timer list (to save system resources). |
| 645 | * This timer may be expired, and if so, we will do it here. Otherwise |
| 646 | * it is the same as a requeue pending timer WRT to what we should |
| 647 | * report. |
| 648 | */ |
| 649 | static void |
| 650 | common_timer_get(struct k_itimer *timr, struct itimerspec *cur_setting) |
| 651 | { |
Roman Zippel | 3b98a53 | 2006-03-26 01:38:07 -0800 | [diff] [blame] | 652 | ktime_t now, remaining, iv; |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 653 | struct hrtimer *timer = &timr->it.real.timer; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 654 | |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 655 | memset(cur_setting, 0, sizeof(struct itimerspec)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 656 | |
Roman Zippel | 3b98a53 | 2006-03-26 01:38:07 -0800 | [diff] [blame] | 657 | iv = timr->it.real.interval; |
| 658 | |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 659 | /* interval timer ? */ |
Roman Zippel | 3b98a53 | 2006-03-26 01:38:07 -0800 | [diff] [blame] | 660 | if (iv.tv64) |
| 661 | cur_setting->it_interval = ktime_to_timespec(iv); |
| 662 | else if (!hrtimer_active(timer) && |
| 663 | (timr->it_sigev_notify & ~SIGEV_THREAD_ID) != SIGEV_NONE) |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 664 | return; |
Roman Zippel | 3b98a53 | 2006-03-26 01:38:07 -0800 | [diff] [blame] | 665 | |
| 666 | now = timer->base->get_time(); |
| 667 | |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 668 | /* |
Roman Zippel | 3b98a53 | 2006-03-26 01:38:07 -0800 | [diff] [blame] | 669 | * When a requeue is pending or this is a SIGEV_NONE |
| 670 | * timer move the expiry time forward by intervals, so |
| 671 | * expiry is > now. |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 672 | */ |
Roman Zippel | 3b98a53 | 2006-03-26 01:38:07 -0800 | [diff] [blame] | 673 | if (iv.tv64 && (timr->it_requeue_pending & REQUEUE_PENDING || |
| 674 | (timr->it_sigev_notify & ~SIGEV_THREAD_ID) == SIGEV_NONE)) |
Davide Libenzi | 4d672e7 | 2008-02-04 22:27:26 -0800 | [diff] [blame] | 675 | timr->it_overrun += (unsigned int) hrtimer_forward(timer, now, iv); |
Roman Zippel | 3b98a53 | 2006-03-26 01:38:07 -0800 | [diff] [blame] | 676 | |
Arjan van de Ven | cc584b2 | 2008-09-01 15:02:30 -0700 | [diff] [blame] | 677 | remaining = ktime_sub(hrtimer_get_expires(timer), now); |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 678 | /* Return 0 only, when the timer is expired and not pending */ |
Roman Zippel | 3b98a53 | 2006-03-26 01:38:07 -0800 | [diff] [blame] | 679 | if (remaining.tv64 <= 0) { |
| 680 | /* |
| 681 | * A single shot SIGEV_NONE timer must return 0, when |
| 682 | * it is expired ! |
| 683 | */ |
| 684 | if ((timr->it_sigev_notify & ~SIGEV_THREAD_ID) != SIGEV_NONE) |
| 685 | cur_setting->it_value.tv_nsec = 1; |
| 686 | } else |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 687 | cur_setting->it_value = ktime_to_timespec(remaining); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 688 | } |
| 689 | |
| 690 | /* Get the time remaining on a POSIX.1b interval timer. */ |
Heiko Carstens | 362e9c0 | 2009-01-14 14:14:07 +0100 | [diff] [blame] | 691 | SYSCALL_DEFINE2(timer_gettime, timer_t, timer_id, |
| 692 | struct itimerspec __user *, setting) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 693 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 694 | struct itimerspec cur_setting; |
Thomas Gleixner | a7319fa | 2011-02-01 13:52:04 +0000 | [diff] [blame] | 695 | struct k_itimer *timr; |
| 696 | struct k_clock *kc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 697 | unsigned long flags; |
Thomas Gleixner | a7319fa | 2011-02-01 13:52:04 +0000 | [diff] [blame] | 698 | int ret = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 699 | |
| 700 | timr = lock_timer(timer_id, &flags); |
| 701 | if (!timr) |
| 702 | return -EINVAL; |
| 703 | |
Thomas Gleixner | a7319fa | 2011-02-01 13:52:04 +0000 | [diff] [blame] | 704 | kc = clockid_to_kclock(timr->it_clock); |
| 705 | if (WARN_ON_ONCE(!kc || !kc->timer_get)) |
| 706 | ret = -EINVAL; |
| 707 | else |
| 708 | kc->timer_get(timr, &cur_setting); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 709 | |
| 710 | unlock_timer(timr, flags); |
| 711 | |
Thomas Gleixner | a7319fa | 2011-02-01 13:52:04 +0000 | [diff] [blame] | 712 | if (!ret && copy_to_user(setting, &cur_setting, sizeof (cur_setting))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 713 | return -EFAULT; |
| 714 | |
Thomas Gleixner | a7319fa | 2011-02-01 13:52:04 +0000 | [diff] [blame] | 715 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 716 | } |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 717 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 718 | /* |
| 719 | * Get the number of overruns of a POSIX.1b interval timer. This is to |
| 720 | * be the overrun of the timer last delivered. At the same time we are |
| 721 | * accumulating overruns on the next timer. The overrun is frozen when |
| 722 | * the signal is delivered, either at the notify time (if the info block |
| 723 | * is not queued) or at the actual delivery time (as we are informed by |
| 724 | * the call back to do_schedule_next_timer(). So all we need to do is |
| 725 | * to pick up the frozen overrun. |
| 726 | */ |
Heiko Carstens | 362e9c0 | 2009-01-14 14:14:07 +0100 | [diff] [blame] | 727 | SYSCALL_DEFINE1(timer_getoverrun, timer_t, timer_id) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 728 | { |
| 729 | struct k_itimer *timr; |
| 730 | int overrun; |
Al Viro | 5ba2533 | 2007-10-14 19:35:50 +0100 | [diff] [blame] | 731 | unsigned long flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 732 | |
| 733 | timr = lock_timer(timer_id, &flags); |
| 734 | if (!timr) |
| 735 | return -EINVAL; |
| 736 | |
| 737 | overrun = timr->it_overrun_last; |
| 738 | unlock_timer(timr, flags); |
| 739 | |
| 740 | return overrun; |
| 741 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 742 | |
| 743 | /* Set a POSIX.1b interval timer. */ |
| 744 | /* timr->it_lock is taken. */ |
Arjan van de Ven | 858119e | 2006-01-14 13:20:43 -0800 | [diff] [blame] | 745 | static int |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 746 | common_timer_set(struct k_itimer *timr, int flags, |
| 747 | struct itimerspec *new_setting, struct itimerspec *old_setting) |
| 748 | { |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 749 | struct hrtimer *timer = &timr->it.real.timer; |
George Anzinger | 7978672c | 2006-02-01 03:05:11 -0800 | [diff] [blame] | 750 | enum hrtimer_mode mode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 751 | |
| 752 | if (old_setting) |
| 753 | common_timer_get(timr, old_setting); |
| 754 | |
| 755 | /* disable the timer */ |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 756 | timr->it.real.interval.tv64 = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 757 | /* |
| 758 | * careful here. If smp we could be in the "fire" routine which will |
| 759 | * be spinning as we hold the lock. But this is ONLY an SMP issue. |
| 760 | */ |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 761 | if (hrtimer_try_to_cancel(timer) < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 762 | return TIMER_RETRY; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 763 | |
| 764 | timr->it_requeue_pending = (timr->it_requeue_pending + 2) & |
| 765 | ~REQUEUE_PENDING; |
| 766 | timr->it_overrun_last = 0; |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 767 | |
| 768 | /* switch off the timer when it_value is zero */ |
| 769 | 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] | 770 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 771 | |
Thomas Gleixner | c9cb2e3 | 2007-02-16 01:27:49 -0800 | [diff] [blame] | 772 | mode = flags & TIMER_ABSTIME ? HRTIMER_MODE_ABS : HRTIMER_MODE_REL; |
George Anzinger | 7978672c | 2006-02-01 03:05:11 -0800 | [diff] [blame] | 773 | hrtimer_init(&timr->it.real.timer, timr->it_clock, mode); |
George Anzinger | 7978672c | 2006-02-01 03:05:11 -0800 | [diff] [blame] | 774 | timr->it.real.timer.function = posix_timer_fn; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 775 | |
Arjan van de Ven | cc584b2 | 2008-09-01 15:02:30 -0700 | [diff] [blame] | 776 | hrtimer_set_expires(timer, timespec_to_ktime(new_setting->it_value)); |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 777 | |
| 778 | /* Convert interval */ |
| 779 | timr->it.real.interval = timespec_to_ktime(new_setting->it_interval); |
| 780 | |
| 781 | /* SIGEV_NONE timers are not queued ! See common_timer_get */ |
Thomas Gleixner | 952bbc8 | 2006-02-01 03:05:13 -0800 | [diff] [blame] | 782 | if (((timr->it_sigev_notify & ~SIGEV_THREAD_ID) == SIGEV_NONE)) { |
| 783 | /* Setup correct expiry time for relative timers */ |
Thomas Gleixner | 5a7780e | 2008-02-13 09:20:43 +0100 | [diff] [blame] | 784 | if (mode == HRTIMER_MODE_REL) { |
Arjan van de Ven | cc584b2 | 2008-09-01 15:02:30 -0700 | [diff] [blame] | 785 | hrtimer_add_expires(timer, timer->base->get_time()); |
Thomas Gleixner | 5a7780e | 2008-02-13 09:20:43 +0100 | [diff] [blame] | 786 | } |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 787 | return 0; |
Thomas Gleixner | 952bbc8 | 2006-02-01 03:05:13 -0800 | [diff] [blame] | 788 | } |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 789 | |
Arjan van de Ven | cc584b2 | 2008-09-01 15:02:30 -0700 | [diff] [blame] | 790 | hrtimer_start_expires(timer, mode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 791 | return 0; |
| 792 | } |
| 793 | |
| 794 | /* Set a POSIX.1b interval timer */ |
Heiko Carstens | 362e9c0 | 2009-01-14 14:14:07 +0100 | [diff] [blame] | 795 | SYSCALL_DEFINE4(timer_settime, timer_t, timer_id, int, flags, |
| 796 | const struct itimerspec __user *, new_setting, |
| 797 | struct itimerspec __user *, old_setting) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 798 | { |
| 799 | struct k_itimer *timr; |
| 800 | struct itimerspec new_spec, old_spec; |
| 801 | int error = 0; |
Al Viro | 5ba2533 | 2007-10-14 19:35:50 +0100 | [diff] [blame] | 802 | unsigned long flag; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 803 | struct itimerspec *rtn = old_setting ? &old_spec : NULL; |
Thomas Gleixner | 27722df | 2011-02-01 13:52:01 +0000 | [diff] [blame] | 804 | struct k_clock *kc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 805 | |
| 806 | if (!new_setting) |
| 807 | return -EINVAL; |
| 808 | |
| 809 | if (copy_from_user(&new_spec, new_setting, sizeof (new_spec))) |
| 810 | return -EFAULT; |
| 811 | |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 812 | if (!timespec_valid(&new_spec.it_interval) || |
| 813 | !timespec_valid(&new_spec.it_value)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 814 | return -EINVAL; |
| 815 | retry: |
| 816 | timr = lock_timer(timer_id, &flag); |
| 817 | if (!timr) |
| 818 | return -EINVAL; |
| 819 | |
Thomas Gleixner | 27722df | 2011-02-01 13:52:01 +0000 | [diff] [blame] | 820 | kc = clockid_to_kclock(timr->it_clock); |
| 821 | if (WARN_ON_ONCE(!kc || !kc->timer_set)) |
| 822 | error = -EINVAL; |
| 823 | else |
| 824 | error = kc->timer_set(timr, flags, &new_spec, rtn); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 825 | |
| 826 | unlock_timer(timr, flag); |
| 827 | if (error == TIMER_RETRY) { |
| 828 | rtn = NULL; // We already got the old time... |
| 829 | goto retry; |
| 830 | } |
| 831 | |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 832 | if (old_setting && !error && |
| 833 | copy_to_user(old_setting, &old_spec, sizeof (old_spec))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 834 | error = -EFAULT; |
| 835 | |
| 836 | return error; |
| 837 | } |
| 838 | |
Thomas Gleixner | 6761c67 | 2011-02-01 13:52:07 +0000 | [diff] [blame] | 839 | static int common_timer_del(struct k_itimer *timer) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 840 | { |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 841 | timer->it.real.interval.tv64 = 0; |
Oleg Nesterov | f972be3 | 2005-06-23 00:09:00 -0700 | [diff] [blame] | 842 | |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 843 | if (hrtimer_try_to_cancel(&timer->it.real.timer) < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 844 | return TIMER_RETRY; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 845 | return 0; |
| 846 | } |
| 847 | |
| 848 | static inline int timer_delete_hook(struct k_itimer *timer) |
| 849 | { |
Thomas Gleixner | 6761c67 | 2011-02-01 13:52:07 +0000 | [diff] [blame] | 850 | struct k_clock *kc = clockid_to_kclock(timer->it_clock); |
| 851 | |
| 852 | if (WARN_ON_ONCE(!kc || !kc->timer_del)) |
| 853 | return -EINVAL; |
| 854 | return kc->timer_del(timer); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 855 | } |
| 856 | |
| 857 | /* Delete a POSIX.1b interval timer. */ |
Heiko Carstens | 362e9c0 | 2009-01-14 14:14:07 +0100 | [diff] [blame] | 858 | SYSCALL_DEFINE1(timer_delete, timer_t, timer_id) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 859 | { |
| 860 | struct k_itimer *timer; |
Al Viro | 5ba2533 | 2007-10-14 19:35:50 +0100 | [diff] [blame] | 861 | unsigned long flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 862 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 863 | retry_delete: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 864 | timer = lock_timer(timer_id, &flags); |
| 865 | if (!timer) |
| 866 | return -EINVAL; |
| 867 | |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 868 | if (timer_delete_hook(timer) == TIMER_RETRY) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 869 | unlock_timer(timer, flags); |
| 870 | goto retry_delete; |
| 871 | } |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 872 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 873 | spin_lock(¤t->sighand->siglock); |
| 874 | list_del(&timer->list); |
| 875 | spin_unlock(¤t->sighand->siglock); |
| 876 | /* |
| 877 | * This keeps any tasks waiting on the spin lock from thinking |
| 878 | * they got something (see the lock code above). |
| 879 | */ |
Oleg Nesterov | 8999210 | 2008-12-01 14:18:15 -0800 | [diff] [blame] | 880 | timer->it_signal = NULL; |
Oleg Nesterov | 4b7a130 | 2008-07-25 01:47:26 -0700 | [diff] [blame] | 881 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 882 | unlock_timer(timer, flags); |
| 883 | release_posix_timer(timer, IT_ID_SET); |
| 884 | return 0; |
| 885 | } |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 886 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 887 | /* |
| 888 | * return timer owned by the process, used by exit_itimers |
| 889 | */ |
Arjan van de Ven | 858119e | 2006-01-14 13:20:43 -0800 | [diff] [blame] | 890 | static void itimer_delete(struct k_itimer *timer) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 891 | { |
| 892 | unsigned long flags; |
| 893 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 894 | retry_delete: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 895 | spin_lock_irqsave(&timer->it_lock, flags); |
| 896 | |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 897 | if (timer_delete_hook(timer) == TIMER_RETRY) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 898 | unlock_timer(timer, flags); |
| 899 | goto retry_delete; |
| 900 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 901 | list_del(&timer->list); |
| 902 | /* |
| 903 | * This keeps any tasks waiting on the spin lock from thinking |
| 904 | * they got something (see the lock code above). |
| 905 | */ |
Oleg Nesterov | 8999210 | 2008-12-01 14:18:15 -0800 | [diff] [blame] | 906 | timer->it_signal = NULL; |
Oleg Nesterov | 4b7a130 | 2008-07-25 01:47:26 -0700 | [diff] [blame] | 907 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 908 | unlock_timer(timer, flags); |
| 909 | release_posix_timer(timer, IT_ID_SET); |
| 910 | } |
| 911 | |
| 912 | /* |
Roland McGrath | 25f407f | 2005-10-21 15:03:29 -0700 | [diff] [blame] | 913 | * 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] | 914 | * references to the shared signal_struct. |
| 915 | */ |
| 916 | void exit_itimers(struct signal_struct *sig) |
| 917 | { |
| 918 | struct k_itimer *tmr; |
| 919 | |
| 920 | while (!list_empty(&sig->posix_timers)) { |
| 921 | tmr = list_entry(sig->posix_timers.next, struct k_itimer, list); |
| 922 | itimer_delete(tmr); |
| 923 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 924 | } |
| 925 | |
Heiko Carstens | 362e9c0 | 2009-01-14 14:14:07 +0100 | [diff] [blame] | 926 | SYSCALL_DEFINE2(clock_settime, const clockid_t, which_clock, |
| 927 | const struct timespec __user *, tp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 928 | { |
Thomas Gleixner | 26f9a47 | 2011-02-01 13:51:48 +0000 | [diff] [blame] | 929 | struct k_clock *kc = clockid_to_kclock(which_clock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 930 | struct timespec new_tp; |
| 931 | |
Thomas Gleixner | 26f9a47 | 2011-02-01 13:51:48 +0000 | [diff] [blame] | 932 | if (!kc || !kc->clock_set) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 933 | return -EINVAL; |
Thomas Gleixner | 26f9a47 | 2011-02-01 13:51:48 +0000 | [diff] [blame] | 934 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 935 | if (copy_from_user(&new_tp, tp, sizeof (*tp))) |
| 936 | return -EFAULT; |
| 937 | |
Thomas Gleixner | 26f9a47 | 2011-02-01 13:51:48 +0000 | [diff] [blame] | 938 | return kc->clock_set(which_clock, &new_tp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 939 | } |
| 940 | |
Heiko Carstens | 362e9c0 | 2009-01-14 14:14:07 +0100 | [diff] [blame] | 941 | SYSCALL_DEFINE2(clock_gettime, const clockid_t, which_clock, |
| 942 | struct timespec __user *,tp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 943 | { |
Thomas Gleixner | 4228577 | 2011-02-01 13:51:50 +0000 | [diff] [blame] | 944 | struct k_clock *kc = clockid_to_kclock(which_clock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 945 | struct timespec kernel_tp; |
| 946 | int error; |
| 947 | |
Thomas Gleixner | 4228577 | 2011-02-01 13:51:50 +0000 | [diff] [blame] | 948 | if (!kc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 949 | return -EINVAL; |
Thomas Gleixner | 4228577 | 2011-02-01 13:51:50 +0000 | [diff] [blame] | 950 | |
| 951 | error = kc->clock_get(which_clock, &kernel_tp); |
| 952 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 953 | if (!error && copy_to_user(tp, &kernel_tp, sizeof (kernel_tp))) |
| 954 | error = -EFAULT; |
| 955 | |
| 956 | return error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 957 | } |
| 958 | |
Richard Cochran | f1f1d5e | 2011-02-01 13:52:26 +0000 | [diff] [blame] | 959 | SYSCALL_DEFINE2(clock_adjtime, const clockid_t, which_clock, |
| 960 | struct timex __user *, utx) |
| 961 | { |
| 962 | struct k_clock *kc = clockid_to_kclock(which_clock); |
| 963 | struct timex ktx; |
| 964 | int err; |
| 965 | |
| 966 | if (!kc) |
| 967 | return -EINVAL; |
| 968 | if (!kc->clock_adj) |
| 969 | return -EOPNOTSUPP; |
| 970 | |
| 971 | if (copy_from_user(&ktx, utx, sizeof(ktx))) |
| 972 | return -EFAULT; |
| 973 | |
| 974 | err = kc->clock_adj(which_clock, &ktx); |
| 975 | |
| 976 | if (!err && copy_to_user(utx, &ktx, sizeof(ktx))) |
| 977 | return -EFAULT; |
| 978 | |
| 979 | return err; |
| 980 | } |
| 981 | |
Heiko Carstens | 362e9c0 | 2009-01-14 14:14:07 +0100 | [diff] [blame] | 982 | SYSCALL_DEFINE2(clock_getres, const clockid_t, which_clock, |
| 983 | struct timespec __user *, tp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 984 | { |
Thomas Gleixner | e5e542e | 2011-02-01 13:51:53 +0000 | [diff] [blame] | 985 | struct k_clock *kc = clockid_to_kclock(which_clock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 986 | struct timespec rtn_tp; |
| 987 | int error; |
| 988 | |
Thomas Gleixner | e5e542e | 2011-02-01 13:51:53 +0000 | [diff] [blame] | 989 | if (!kc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 990 | return -EINVAL; |
| 991 | |
Thomas Gleixner | e5e542e | 2011-02-01 13:51:53 +0000 | [diff] [blame] | 992 | error = kc->clock_getres(which_clock, &rtn_tp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 993 | |
Thomas Gleixner | e5e542e | 2011-02-01 13:51:53 +0000 | [diff] [blame] | 994 | if (!error && tp && copy_to_user(tp, &rtn_tp, sizeof (rtn_tp))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 995 | error = -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 996 | |
| 997 | return error; |
| 998 | } |
| 999 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1000 | /* |
Thomas Gleixner | 97735f2 | 2006-01-09 20:52:37 -0800 | [diff] [blame] | 1001 | * nanosleep for monotonic and realtime clocks |
| 1002 | */ |
| 1003 | static int common_nsleep(const clockid_t which_clock, int flags, |
| 1004 | struct timespec *tsave, struct timespec __user *rmtp) |
| 1005 | { |
Oleg Nesterov | 080344b | 2008-02-01 17:29:05 +0300 | [diff] [blame] | 1006 | return hrtimer_nanosleep(tsave, rmtp, flags & TIMER_ABSTIME ? |
| 1007 | HRTIMER_MODE_ABS : HRTIMER_MODE_REL, |
| 1008 | which_clock); |
Thomas Gleixner | 97735f2 | 2006-01-09 20:52:37 -0800 | [diff] [blame] | 1009 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1010 | |
Heiko Carstens | 362e9c0 | 2009-01-14 14:14:07 +0100 | [diff] [blame] | 1011 | SYSCALL_DEFINE4(clock_nanosleep, const clockid_t, which_clock, int, flags, |
| 1012 | const struct timespec __user *, rqtp, |
| 1013 | struct timespec __user *, rmtp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1014 | { |
Thomas Gleixner | a5cd288 | 2011-02-01 13:51:11 +0000 | [diff] [blame] | 1015 | struct k_clock *kc = clockid_to_kclock(which_clock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1016 | struct timespec t; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1017 | |
Thomas Gleixner | a5cd288 | 2011-02-01 13:51:11 +0000 | [diff] [blame] | 1018 | if (!kc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1019 | return -EINVAL; |
Thomas Gleixner | a5cd288 | 2011-02-01 13:51:11 +0000 | [diff] [blame] | 1020 | if (!kc->nsleep) |
| 1021 | return -ENANOSLEEP_NOTSUP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1022 | |
| 1023 | if (copy_from_user(&t, rqtp, sizeof (struct timespec))) |
| 1024 | return -EFAULT; |
| 1025 | |
Thomas Gleixner | 5f82b2b | 2006-01-09 20:52:29 -0800 | [diff] [blame] | 1026 | if (!timespec_valid(&t)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1027 | return -EINVAL; |
| 1028 | |
Thomas Gleixner | a5cd288 | 2011-02-01 13:51:11 +0000 | [diff] [blame] | 1029 | return kc->nsleep(which_clock, flags, &t, rmtp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1030 | } |
Toyo Abe | 1711ef3 | 2006-09-29 02:00:28 -0700 | [diff] [blame] | 1031 | |
| 1032 | /* |
Toyo Abe | 1711ef3 | 2006-09-29 02:00:28 -0700 | [diff] [blame] | 1033 | * This will restart clock_nanosleep. This is required only by |
| 1034 | * compat_clock_nanosleep_restart for now. |
| 1035 | */ |
Thomas Gleixner | 59bd5bc | 2011-02-01 13:51:17 +0000 | [diff] [blame] | 1036 | long clock_nanosleep_restart(struct restart_block *restart_block) |
Toyo Abe | 1711ef3 | 2006-09-29 02:00:28 -0700 | [diff] [blame] | 1037 | { |
Thomas Gleixner | 3751f9f | 2011-02-01 13:51:20 +0000 | [diff] [blame] | 1038 | clockid_t which_clock = restart_block->nanosleep.index; |
Thomas Gleixner | 59bd5bc | 2011-02-01 13:51:17 +0000 | [diff] [blame] | 1039 | struct k_clock *kc = clockid_to_kclock(which_clock); |
Toyo Abe | 1711ef3 | 2006-09-29 02:00:28 -0700 | [diff] [blame] | 1040 | |
Thomas Gleixner | 59bd5bc | 2011-02-01 13:51:17 +0000 | [diff] [blame] | 1041 | if (WARN_ON_ONCE(!kc || !kc->nsleep_restart)) |
| 1042 | return -EINVAL; |
| 1043 | |
| 1044 | return kc->nsleep_restart(restart_block); |
Toyo Abe | 1711ef3 | 2006-09-29 02:00:28 -0700 | [diff] [blame] | 1045 | } |