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 |
| 105 | * clocks and allows the possibility of adding others. We |
| 106 | * provide an interface to add clocks to the table and expect |
| 107 | * the "arch" code to add at least one clock that is high |
| 108 | * resolution. Here we define the standard CLOCK_REALTIME as a |
| 109 | * 1/HZ resolution clock. |
| 110 | * |
| 111 | * RESOLUTION: Clock resolution is used to round up timer and interval |
| 112 | * times, NOT to report clock times, which are reported with as |
| 113 | * much resolution as the system can muster. In some cases this |
| 114 | * resolution may depend on the underlying clock hardware and |
| 115 | * may not be quantifiable until run time, and only then is the |
| 116 | * necessary code is written. The standard says we should say |
| 117 | * something about this issue in the documentation... |
| 118 | * |
| 119 | * FUNCTIONS: The CLOCKs structure defines possible functions to handle |
| 120 | * various clock functions. For clocks that use the standard |
| 121 | * system timer code these entries should be NULL. This will |
| 122 | * allow dispatch without the overhead of indirect function |
| 123 | * calls. CLOCKS that depend on other sources (e.g. WWV or GPS) |
| 124 | * must supply functions here, even if the function just returns |
| 125 | * ENOSYS. The standard POSIX timer management code assumes the |
| 126 | * following: 1.) The k_itimer struct (sched.h) is used for the |
Oleg Nesterov | 27af424 | 2008-12-01 14:18:13 -0800 | [diff] [blame] | 127 | * timer. 2.) The list, it_lock, it_clock, it_id and it_pid |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 128 | * fields are not modified by timer code. |
| 129 | * |
| 130 | * At this time all functions EXCEPT clock_nanosleep can be |
| 131 | * redirected by the CLOCKS structure. Clock_nanosleep is in |
| 132 | * there, but the code ignores it. |
| 133 | * |
| 134 | * Permissions: It is assumed that the clock_settime() function defined |
| 135 | * for each clock will take care of permission checks. Some |
| 136 | * clocks may be set able by any user (i.e. local process |
| 137 | * clocks) others not. Currently the only set able clock we |
| 138 | * have is CLOCK_REALTIME and its high res counter part, both of |
| 139 | * which we beg off on and pass to do_sys_settimeofday(). |
| 140 | */ |
| 141 | |
| 142 | static struct k_clock posix_clocks[MAX_CLOCKS]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 143 | |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 144 | /* |
| 145 | * These ones are defined below. |
| 146 | */ |
| 147 | static int common_nsleep(const clockid_t, int flags, struct timespec *t, |
| 148 | struct timespec __user *rmtp); |
| 149 | static void common_timer_get(struct k_itimer *, struct itimerspec *); |
| 150 | static int common_timer_set(struct k_itimer *, int, |
| 151 | struct itimerspec *, struct itimerspec *); |
| 152 | static int common_timer_del(struct k_itimer *timer); |
| 153 | |
Thomas Gleixner | c9cb2e3 | 2007-02-16 01:27:49 -0800 | [diff] [blame] | 154 | static enum hrtimer_restart posix_timer_fn(struct hrtimer *data); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 155 | |
Namhyung Kim | 20f33a0 | 2010-10-20 15:57:34 -0700 | [diff] [blame] | 156 | static struct k_itimer *__lock_timer(timer_t timer_id, unsigned long *flags); |
| 157 | |
| 158 | #define lock_timer(tid, flags) \ |
| 159 | ({ struct k_itimer *__timr; \ |
| 160 | __cond_lock(&__timr->it_lock, __timr = __lock_timer(tid, flags)); \ |
| 161 | __timr; \ |
| 162 | }) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 163 | |
| 164 | static inline void unlock_timer(struct k_itimer *timr, unsigned long flags) |
| 165 | { |
| 166 | spin_unlock_irqrestore(&timr->it_lock, flags); |
| 167 | } |
| 168 | |
| 169 | /* |
| 170 | * Call the k_clock hook function if non-null, or the default function. |
| 171 | */ |
| 172 | #define CLOCK_DISPATCH(clock, call, arglist) \ |
| 173 | ((clock) < 0 ? posix_cpu_##call arglist : \ |
| 174 | (posix_clocks[clock].call != NULL \ |
| 175 | ? (*posix_clocks[clock].call) arglist : common_##call arglist)) |
| 176 | |
| 177 | /* |
| 178 | * Default clock hook functions when the struct k_clock passed |
| 179 | * to register_posix_clock leaves a function pointer null. |
| 180 | * |
| 181 | * The function common_CALL is the default implementation for |
| 182 | * the function pointer CALL in struct k_clock. |
| 183 | */ |
| 184 | |
Thomas Gleixner | a924b04 | 2006-01-09 20:52:27 -0800 | [diff] [blame] | 185 | static inline int common_clock_getres(const clockid_t which_clock, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 186 | struct timespec *tp) |
| 187 | { |
| 188 | tp->tv_sec = 0; |
| 189 | tp->tv_nsec = posix_clocks[which_clock].res; |
| 190 | return 0; |
| 191 | } |
| 192 | |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 193 | /* |
| 194 | * Get real time for posix timers |
| 195 | */ |
| 196 | static int common_clock_get(clockid_t which_clock, struct timespec *tp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 197 | { |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 198 | ktime_get_real_ts(tp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 199 | return 0; |
| 200 | } |
| 201 | |
Thomas Gleixner | a924b04 | 2006-01-09 20:52:27 -0800 | [diff] [blame] | 202 | static inline int common_clock_set(const clockid_t which_clock, |
Richard Cochran | 1e6d767 | 2011-02-01 13:50:58 +0000 | [diff] [blame] | 203 | const struct timespec *tp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 204 | { |
| 205 | return do_sys_settimeofday(tp, NULL); |
| 206 | } |
| 207 | |
Arjan van de Ven | 858119e | 2006-01-14 13:20:43 -0800 | [diff] [blame] | 208 | static int common_timer_create(struct k_itimer *new_timer) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 209 | { |
George Anzinger | 7978672c | 2006-02-01 03:05:11 -0800 | [diff] [blame] | 210 | hrtimer_init(&new_timer->it.real.timer, new_timer->it_clock, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 211 | return 0; |
| 212 | } |
| 213 | |
Thomas Gleixner | 3d44cc3 | 2008-12-20 21:27:34 +0100 | [diff] [blame] | 214 | static int no_timer_create(struct k_itimer *new_timer) |
| 215 | { |
| 216 | return -EOPNOTSUPP; |
| 217 | } |
| 218 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 219 | /* |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 220 | * Return nonzero if we know a priori this clockid_t value is bogus. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 221 | */ |
Thomas Gleixner | a924b04 | 2006-01-09 20:52:27 -0800 | [diff] [blame] | 222 | static inline int invalid_clockid(const clockid_t which_clock) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 223 | { |
| 224 | if (which_clock < 0) /* CPU clock, posix_cpu_* will check it */ |
| 225 | return 0; |
| 226 | if ((unsigned) which_clock >= MAX_CLOCKS) |
| 227 | return 1; |
| 228 | if (posix_clocks[which_clock].clock_getres != NULL) |
| 229 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 230 | if (posix_clocks[which_clock].res != 0) |
| 231 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 232 | return 1; |
| 233 | } |
| 234 | |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 235 | /* |
| 236 | * Get monotonic time for posix timers |
| 237 | */ |
| 238 | static int posix_ktime_get_ts(clockid_t which_clock, struct timespec *tp) |
| 239 | { |
| 240 | ktime_get_ts(tp); |
| 241 | return 0; |
| 242 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 243 | |
| 244 | /* |
John Stultz | 2d42244 | 2008-08-20 16:37:30 -0700 | [diff] [blame] | 245 | * Get monotonic time for posix timers |
| 246 | */ |
| 247 | static int posix_get_monotonic_raw(clockid_t which_clock, struct timespec *tp) |
| 248 | { |
| 249 | getrawmonotonic(tp); |
| 250 | return 0; |
| 251 | } |
| 252 | |
john stultz | da15cfd | 2009-08-19 19:13:34 -0700 | [diff] [blame] | 253 | |
| 254 | static int posix_get_realtime_coarse(clockid_t which_clock, struct timespec *tp) |
| 255 | { |
| 256 | *tp = current_kernel_time(); |
| 257 | return 0; |
| 258 | } |
| 259 | |
| 260 | static int posix_get_monotonic_coarse(clockid_t which_clock, |
| 261 | struct timespec *tp) |
| 262 | { |
| 263 | *tp = get_monotonic_coarse(); |
| 264 | return 0; |
| 265 | } |
| 266 | |
H Hartley Sweeten | 6622e67 | 2010-02-02 14:41:42 -0800 | [diff] [blame] | 267 | 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] | 268 | { |
| 269 | *tp = ktime_to_timespec(KTIME_LOW_RES); |
| 270 | return 0; |
| 271 | } |
John Stultz | 2d42244 | 2008-08-20 16:37:30 -0700 | [diff] [blame] | 272 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 273 | * Initialize everything, well, just everything in Posix clocks/timers ;) |
| 274 | */ |
| 275 | static __init int init_posix_timers(void) |
| 276 | { |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 277 | struct k_clock clock_realtime = { |
Thomas Gleixner | 2fd1f04 | 2011-02-01 13:51:03 +0000 | [diff] [blame] | 278 | .clock_getres = hrtimer_get_res, |
Thomas Gleixner | a5cd288 | 2011-02-01 13:51:11 +0000 | [diff] [blame^] | 279 | .nsleep = common_nsleep, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 280 | }; |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 281 | struct k_clock clock_monotonic = { |
Thomas Gleixner | 2fd1f04 | 2011-02-01 13:51:03 +0000 | [diff] [blame] | 282 | .clock_getres = hrtimer_get_res, |
| 283 | .clock_get = posix_ktime_get_ts, |
| 284 | .clock_set = do_posix_clock_nosettime, |
Thomas Gleixner | a5cd288 | 2011-02-01 13:51:11 +0000 | [diff] [blame^] | 285 | .nsleep = common_nsleep, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 286 | }; |
John Stultz | 2d42244 | 2008-08-20 16:37:30 -0700 | [diff] [blame] | 287 | struct k_clock clock_monotonic_raw = { |
Thomas Gleixner | 2fd1f04 | 2011-02-01 13:51:03 +0000 | [diff] [blame] | 288 | .clock_getres = hrtimer_get_res, |
| 289 | .clock_get = posix_get_monotonic_raw, |
| 290 | .clock_set = do_posix_clock_nosettime, |
| 291 | .timer_create = no_timer_create, |
John Stultz | 2d42244 | 2008-08-20 16:37:30 -0700 | [diff] [blame] | 292 | }; |
john stultz | da15cfd | 2009-08-19 19:13:34 -0700 | [diff] [blame] | 293 | struct k_clock clock_realtime_coarse = { |
Thomas Gleixner | 2fd1f04 | 2011-02-01 13:51:03 +0000 | [diff] [blame] | 294 | .clock_getres = posix_get_coarse_res, |
| 295 | .clock_get = posix_get_realtime_coarse, |
| 296 | .clock_set = do_posix_clock_nosettime, |
| 297 | .timer_create = no_timer_create, |
john stultz | da15cfd | 2009-08-19 19:13:34 -0700 | [diff] [blame] | 298 | }; |
| 299 | struct k_clock clock_monotonic_coarse = { |
Thomas Gleixner | 2fd1f04 | 2011-02-01 13:51:03 +0000 | [diff] [blame] | 300 | .clock_getres = posix_get_coarse_res, |
| 301 | .clock_get = posix_get_monotonic_coarse, |
| 302 | .clock_set = do_posix_clock_nosettime, |
| 303 | .timer_create = no_timer_create, |
john stultz | da15cfd | 2009-08-19 19:13:34 -0700 | [diff] [blame] | 304 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 305 | |
| 306 | register_posix_clock(CLOCK_REALTIME, &clock_realtime); |
| 307 | register_posix_clock(CLOCK_MONOTONIC, &clock_monotonic); |
John Stultz | 2d42244 | 2008-08-20 16:37:30 -0700 | [diff] [blame] | 308 | register_posix_clock(CLOCK_MONOTONIC_RAW, &clock_monotonic_raw); |
john stultz | da15cfd | 2009-08-19 19:13:34 -0700 | [diff] [blame] | 309 | register_posix_clock(CLOCK_REALTIME_COARSE, &clock_realtime_coarse); |
| 310 | register_posix_clock(CLOCK_MONOTONIC_COARSE, &clock_monotonic_coarse); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 311 | |
| 312 | posix_timers_cache = kmem_cache_create("posix_timers_cache", |
Alexey Dobriyan | 040b5c6 | 2007-10-16 23:26:10 -0700 | [diff] [blame] | 313 | sizeof (struct k_itimer), 0, SLAB_PANIC, |
| 314 | NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 315 | idr_init(&posix_timers_id); |
| 316 | return 0; |
| 317 | } |
| 318 | |
| 319 | __initcall(init_posix_timers); |
| 320 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 321 | static void schedule_next_timer(struct k_itimer *timr) |
| 322 | { |
Roman Zippel | 44f2147 | 2006-03-26 01:38:06 -0800 | [diff] [blame] | 323 | struct hrtimer *timer = &timr->it.real.timer; |
| 324 | |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 325 | if (timr->it.real.interval.tv64 == 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 326 | return; |
| 327 | |
Davide Libenzi | 4d672e7 | 2008-02-04 22:27:26 -0800 | [diff] [blame] | 328 | timr->it_overrun += (unsigned int) hrtimer_forward(timer, |
| 329 | timer->base->get_time(), |
| 330 | timr->it.real.interval); |
Roman Zippel | 44f2147 | 2006-03-26 01:38:06 -0800 | [diff] [blame] | 331 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 332 | timr->it_overrun_last = timr->it_overrun; |
| 333 | timr->it_overrun = -1; |
| 334 | ++timr->it_requeue_pending; |
Roman Zippel | 44f2147 | 2006-03-26 01:38:06 -0800 | [diff] [blame] | 335 | hrtimer_restart(timer); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 336 | } |
| 337 | |
| 338 | /* |
| 339 | * This function is exported for use by the signal deliver code. It is |
| 340 | * called just prior to the info block being released and passes that |
| 341 | * block to us. It's function is to update the overrun entry AND to |
| 342 | * restart the timer. It should only be called if the timer is to be |
| 343 | * restarted (i.e. we have flagged this in the sys_private entry of the |
| 344 | * info block). |
| 345 | * |
| 346 | * To protect aginst the timer going away while the interrupt is queued, |
| 347 | * we require that the it_requeue_pending flag be set. |
| 348 | */ |
| 349 | void do_schedule_next_timer(struct siginfo *info) |
| 350 | { |
| 351 | struct k_itimer *timr; |
| 352 | unsigned long flags; |
| 353 | |
| 354 | timr = lock_timer(info->si_tid, &flags); |
| 355 | |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 356 | if (timr && timr->it_requeue_pending == info->si_sys_private) { |
| 357 | if (timr->it_clock < 0) |
| 358 | posix_cpu_timer_schedule(timr); |
| 359 | else |
| 360 | schedule_next_timer(timr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 361 | |
Oleg Nesterov | 54da117 | 2008-07-23 20:52:05 +0400 | [diff] [blame] | 362 | info->si_overrun += timr->it_overrun_last; |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 363 | } |
| 364 | |
Thomas Gleixner | b6557fb | 2006-02-01 03:05:09 -0800 | [diff] [blame] | 365 | if (timr) |
| 366 | unlock_timer(timr, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 367 | } |
| 368 | |
Oleg Nesterov | ba66129 | 2008-07-23 20:52:05 +0400 | [diff] [blame] | 369 | int posix_timer_event(struct k_itimer *timr, int si_private) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 370 | { |
Oleg Nesterov | 27af424 | 2008-12-01 14:18:13 -0800 | [diff] [blame] | 371 | struct task_struct *task; |
| 372 | int shared, ret = -1; |
Oleg Nesterov | ba66129 | 2008-07-23 20:52:05 +0400 | [diff] [blame] | 373 | /* |
| 374 | * FIXME: if ->sigq is queued we can race with |
| 375 | * dequeue_signal()->do_schedule_next_timer(). |
| 376 | * |
| 377 | * If dequeue_signal() sees the "right" value of |
| 378 | * si_sys_private it calls do_schedule_next_timer(). |
| 379 | * We re-queue ->sigq and drop ->it_lock(). |
| 380 | * do_schedule_next_timer() locks the timer |
| 381 | * and re-schedules it while ->sigq is pending. |
| 382 | * Not really bad, but not that we want. |
| 383 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 384 | timr->sigq->info.si_sys_private = si_private; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 385 | |
Oleg Nesterov | 27af424 | 2008-12-01 14:18:13 -0800 | [diff] [blame] | 386 | rcu_read_lock(); |
| 387 | task = pid_task(timr->it_pid, PIDTYPE_PID); |
| 388 | if (task) { |
| 389 | shared = !(timr->it_sigev_notify & SIGEV_THREAD_ID); |
| 390 | ret = send_sigqueue(timr->sigq, task, shared); |
| 391 | } |
| 392 | rcu_read_unlock(); |
Oleg Nesterov | 4aa7361 | 2008-09-22 14:42:46 -0700 | [diff] [blame] | 393 | /* If we failed to send the signal the timer stops. */ |
| 394 | return ret > 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 395 | } |
| 396 | EXPORT_SYMBOL_GPL(posix_timer_event); |
| 397 | |
| 398 | /* |
| 399 | * This function gets called when a POSIX.1b interval timer expires. It |
| 400 | * is used as a callback from the kernel internal timer. The |
| 401 | * run_timer_list code ALWAYS calls with interrupts on. |
| 402 | |
| 403 | * This code is for CLOCK_REALTIME* and CLOCK_MONOTONIC* timers. |
| 404 | */ |
Thomas Gleixner | c9cb2e3 | 2007-02-16 01:27:49 -0800 | [diff] [blame] | 405 | static enum hrtimer_restart posix_timer_fn(struct hrtimer *timer) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 406 | { |
Roman Zippel | 05cfb61 | 2006-03-26 01:38:12 -0800 | [diff] [blame] | 407 | struct k_itimer *timr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 408 | unsigned long flags; |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 409 | int si_private = 0; |
Thomas Gleixner | c9cb2e3 | 2007-02-16 01:27:49 -0800 | [diff] [blame] | 410 | enum hrtimer_restart ret = HRTIMER_NORESTART; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 411 | |
Roman Zippel | 05cfb61 | 2006-03-26 01:38:12 -0800 | [diff] [blame] | 412 | timr = container_of(timer, struct k_itimer, it.real.timer); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 413 | spin_lock_irqsave(&timr->it_lock, flags); |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 414 | |
| 415 | if (timr->it.real.interval.tv64 != 0) |
| 416 | si_private = ++timr->it_requeue_pending; |
| 417 | |
| 418 | if (posix_timer_event(timr, si_private)) { |
| 419 | /* |
| 420 | * signal was not sent because of sig_ignor |
| 421 | * we will not get a call back to restart it AND |
| 422 | * it should be restarted. |
| 423 | */ |
| 424 | if (timr->it.real.interval.tv64 != 0) { |
Thomas Gleixner | 58229a1 | 2007-06-21 20:45:15 +0000 | [diff] [blame] | 425 | ktime_t now = hrtimer_cb_get_time(timer); |
| 426 | |
| 427 | /* |
| 428 | * FIXME: What we really want, is to stop this |
| 429 | * timer completely and restart it in case the |
| 430 | * SIG_IGN is removed. This is a non trivial |
| 431 | * change which involves sighand locking |
| 432 | * (sigh !), which we don't want to do late in |
| 433 | * the release cycle. |
| 434 | * |
| 435 | * For now we just let timers with an interval |
| 436 | * less than a jiffie expire every jiffie to |
| 437 | * avoid softirq starvation in case of SIG_IGN |
| 438 | * and a very small interval, which would put |
| 439 | * the timer right back on the softirq pending |
| 440 | * list. By moving now ahead of time we trick |
| 441 | * hrtimer_forward() to expire the timer |
| 442 | * later, while we still maintain the overrun |
| 443 | * accuracy, but have some inconsistency in |
| 444 | * the timer_gettime() case. This is at least |
| 445 | * better than a starved softirq. A more |
| 446 | * complex fix which solves also another related |
| 447 | * inconsistency is already in the pipeline. |
| 448 | */ |
| 449 | #ifdef CONFIG_HIGH_RES_TIMERS |
| 450 | { |
| 451 | ktime_t kj = ktime_set(0, NSEC_PER_SEC / HZ); |
| 452 | |
| 453 | if (timr->it.real.interval.tv64 < kj.tv64) |
| 454 | now = ktime_add(now, kj); |
| 455 | } |
| 456 | #endif |
Davide Libenzi | 4d672e7 | 2008-02-04 22:27:26 -0800 | [diff] [blame] | 457 | timr->it_overrun += (unsigned int) |
Thomas Gleixner | 58229a1 | 2007-06-21 20:45:15 +0000 | [diff] [blame] | 458 | hrtimer_forward(timer, now, |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 459 | timr->it.real.interval); |
| 460 | ret = HRTIMER_RESTART; |
Roman Zippel | a0a0c28 | 2006-03-16 23:04:01 -0800 | [diff] [blame] | 461 | ++timr->it_requeue_pending; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 462 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 463 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 464 | |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 465 | unlock_timer(timr, flags); |
| 466 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 467 | } |
| 468 | |
Oleg Nesterov | 27af424 | 2008-12-01 14:18:13 -0800 | [diff] [blame] | 469 | static struct pid *good_sigevent(sigevent_t * event) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 470 | { |
| 471 | struct task_struct *rtn = current->group_leader; |
| 472 | |
| 473 | if ((event->sigev_notify & SIGEV_THREAD_ID ) && |
Pavel Emelyanov | 8dc86af | 2008-02-08 04:21:52 -0800 | [diff] [blame] | 474 | (!(rtn = find_task_by_vpid(event->sigev_notify_thread_id)) || |
Pavel Emelyanov | bac0abd | 2007-10-18 23:40:18 -0700 | [diff] [blame] | 475 | !same_thread_group(rtn, current) || |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 476 | (event->sigev_notify & ~SIGEV_THREAD_ID) != SIGEV_SIGNAL)) |
| 477 | return NULL; |
| 478 | |
| 479 | if (((event->sigev_notify & ~SIGEV_THREAD_ID) != SIGEV_NONE) && |
| 480 | ((event->sigev_signo <= 0) || (event->sigev_signo > SIGRTMAX))) |
| 481 | return NULL; |
| 482 | |
Oleg Nesterov | 27af424 | 2008-12-01 14:18:13 -0800 | [diff] [blame] | 483 | return task_pid(rtn); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 484 | } |
| 485 | |
Thomas Gleixner | a924b04 | 2006-01-09 20:52:27 -0800 | [diff] [blame] | 486 | 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] | 487 | { |
| 488 | if ((unsigned) clock_id >= MAX_CLOCKS) { |
| 489 | printk("POSIX clock register failed for clock_id %d\n", |
| 490 | clock_id); |
| 491 | return; |
| 492 | } |
| 493 | |
| 494 | posix_clocks[clock_id] = *new_clock; |
| 495 | } |
| 496 | EXPORT_SYMBOL_GPL(register_posix_clock); |
| 497 | |
| 498 | static struct k_itimer * alloc_posix_timer(void) |
| 499 | { |
| 500 | struct k_itimer *tmr; |
Robert P. J. Day | c376222 | 2007-02-10 01:45:03 -0800 | [diff] [blame] | 501 | tmr = kmem_cache_zalloc(posix_timers_cache, GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 502 | if (!tmr) |
| 503 | return tmr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 504 | if (unlikely(!(tmr->sigq = sigqueue_alloc()))) { |
| 505 | kmem_cache_free(posix_timers_cache, tmr); |
Dan Carpenter | aa94fbd | 2008-10-02 14:50:14 -0700 | [diff] [blame] | 506 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 507 | } |
Oleg Nesterov | ba66129 | 2008-07-23 20:52:05 +0400 | [diff] [blame] | 508 | memset(&tmr->sigq->info, 0, sizeof(siginfo_t)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 509 | return tmr; |
| 510 | } |
| 511 | |
| 512 | #define IT_ID_SET 1 |
| 513 | #define IT_ID_NOT_SET 0 |
| 514 | static void release_posix_timer(struct k_itimer *tmr, int it_id_set) |
| 515 | { |
| 516 | if (it_id_set) { |
| 517 | unsigned long flags; |
| 518 | spin_lock_irqsave(&idr_lock, flags); |
| 519 | idr_remove(&posix_timers_id, tmr->it_id); |
| 520 | spin_unlock_irqrestore(&idr_lock, flags); |
| 521 | } |
Oleg Nesterov | 8999210 | 2008-12-01 14:18:15 -0800 | [diff] [blame] | 522 | put_pid(tmr->it_pid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 523 | sigqueue_free(tmr->sigq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 524 | kmem_cache_free(posix_timers_cache, tmr); |
| 525 | } |
| 526 | |
Thomas Gleixner | cc785ac | 2011-02-01 13:51:09 +0000 | [diff] [blame] | 527 | static struct k_clock *clockid_to_kclock(const clockid_t id) |
| 528 | { |
| 529 | if (id < 0) |
| 530 | return &clock_posix_cpu; |
| 531 | |
| 532 | if (id >= MAX_CLOCKS || !posix_clocks[id].clock_getres) |
| 533 | return NULL; |
| 534 | return &posix_clocks[id]; |
| 535 | } |
| 536 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 537 | /* Create a POSIX.1b interval timer. */ |
| 538 | |
Heiko Carstens | 362e9c0 | 2009-01-14 14:14:07 +0100 | [diff] [blame] | 539 | SYSCALL_DEFINE3(timer_create, const clockid_t, which_clock, |
| 540 | struct sigevent __user *, timer_event_spec, |
| 541 | timer_t __user *, created_timer_id) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 542 | { |
Oleg Nesterov | 2cd499e | 2008-09-22 14:42:47 -0700 | [diff] [blame] | 543 | struct k_itimer *new_timer; |
Oleg Nesterov | ef864c9 | 2008-09-22 14:42:49 -0700 | [diff] [blame] | 544 | int error, new_timer_id; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 545 | sigevent_t event; |
| 546 | int it_id_set = IT_ID_NOT_SET; |
| 547 | |
| 548 | if (invalid_clockid(which_clock)) |
| 549 | return -EINVAL; |
| 550 | |
| 551 | new_timer = alloc_posix_timer(); |
| 552 | if (unlikely(!new_timer)) |
| 553 | return -EAGAIN; |
| 554 | |
| 555 | spin_lock_init(&new_timer->it_lock); |
| 556 | retry: |
| 557 | if (unlikely(!idr_pre_get(&posix_timers_id, GFP_KERNEL))) { |
| 558 | error = -EAGAIN; |
| 559 | goto out; |
| 560 | } |
| 561 | spin_lock_irq(&idr_lock); |
Oleg Nesterov | 5a51b71 | 2008-09-22 14:42:51 -0700 | [diff] [blame] | 562 | error = idr_get_new(&posix_timers_id, new_timer, &new_timer_id); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 563 | spin_unlock_irq(&idr_lock); |
Oleg Nesterov | ef864c9 | 2008-09-22 14:42:49 -0700 | [diff] [blame] | 564 | if (error) { |
| 565 | if (error == -EAGAIN) |
| 566 | goto retry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 567 | /* |
Joe Perches | 0b0a3e7 | 2008-02-03 17:48:04 +0200 | [diff] [blame] | 568 | * Weird looking, but we return EAGAIN if the IDR is |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 569 | * full (proper POSIX return value for this) |
| 570 | */ |
| 571 | error = -EAGAIN; |
| 572 | goto out; |
| 573 | } |
| 574 | |
| 575 | it_id_set = IT_ID_SET; |
| 576 | new_timer->it_id = (timer_t) new_timer_id; |
| 577 | new_timer->it_clock = which_clock; |
| 578 | new_timer->it_overrun = -1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 579 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 580 | if (timer_event_spec) { |
| 581 | if (copy_from_user(&event, timer_event_spec, sizeof (event))) { |
| 582 | error = -EFAULT; |
| 583 | goto out; |
| 584 | } |
Oleg Nesterov | 36b2f04 | 2008-09-22 14:42:48 -0700 | [diff] [blame] | 585 | rcu_read_lock(); |
Oleg Nesterov | 8999210 | 2008-12-01 14:18:15 -0800 | [diff] [blame] | 586 | new_timer->it_pid = get_pid(good_sigevent(&event)); |
Oleg Nesterov | 36b2f04 | 2008-09-22 14:42:48 -0700 | [diff] [blame] | 587 | rcu_read_unlock(); |
Oleg Nesterov | 8999210 | 2008-12-01 14:18:15 -0800 | [diff] [blame] | 588 | if (!new_timer->it_pid) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 589 | error = -EINVAL; |
| 590 | goto out; |
| 591 | } |
| 592 | } else { |
Oleg Nesterov | 5a9fa73 | 2008-09-22 14:42:50 -0700 | [diff] [blame] | 593 | event.sigev_notify = SIGEV_SIGNAL; |
| 594 | event.sigev_signo = SIGALRM; |
| 595 | event.sigev_value.sival_int = new_timer->it_id; |
Oleg Nesterov | 8999210 | 2008-12-01 14:18:15 -0800 | [diff] [blame] | 596 | new_timer->it_pid = get_pid(task_tgid(current)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 597 | } |
| 598 | |
Oleg Nesterov | 5a9fa73 | 2008-09-22 14:42:50 -0700 | [diff] [blame] | 599 | new_timer->it_sigev_notify = event.sigev_notify; |
| 600 | new_timer->sigq->info.si_signo = event.sigev_signo; |
| 601 | new_timer->sigq->info.si_value = event.sigev_value; |
Oleg Nesterov | 717835d | 2008-09-22 14:42:49 -0700 | [diff] [blame] | 602 | new_timer->sigq->info.si_tid = new_timer->it_id; |
Oleg Nesterov | 5a9fa73 | 2008-09-22 14:42:50 -0700 | [diff] [blame] | 603 | new_timer->sigq->info.si_code = SI_TIMER; |
Oleg Nesterov | 717835d | 2008-09-22 14:42:49 -0700 | [diff] [blame] | 604 | |
Andrey Vagin | 2b08de0 | 2010-07-20 15:23:14 -0700 | [diff] [blame] | 605 | if (copy_to_user(created_timer_id, |
| 606 | &new_timer_id, sizeof (new_timer_id))) { |
| 607 | error = -EFAULT; |
| 608 | goto out; |
| 609 | } |
| 610 | |
Andrey Vagin | 45e0fff | 2010-05-24 12:15:33 -0700 | [diff] [blame] | 611 | error = CLOCK_DISPATCH(which_clock, timer_create, (new_timer)); |
| 612 | if (error) |
| 613 | goto out; |
| 614 | |
Oleg Nesterov | 36b2f04 | 2008-09-22 14:42:48 -0700 | [diff] [blame] | 615 | spin_lock_irq(¤t->sighand->siglock); |
Oleg Nesterov | 27af424 | 2008-12-01 14:18:13 -0800 | [diff] [blame] | 616 | new_timer->it_signal = current->signal; |
Oleg Nesterov | 36b2f04 | 2008-09-22 14:42:48 -0700 | [diff] [blame] | 617 | list_add(&new_timer->list, ¤t->signal->posix_timers); |
| 618 | spin_unlock_irq(¤t->sighand->siglock); |
Oleg Nesterov | ef864c9 | 2008-09-22 14:42:49 -0700 | [diff] [blame] | 619 | |
| 620 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 621 | /* |
| 622 | * In the case of the timer belonging to another task, after |
| 623 | * the task is unlocked, the timer is owned by the other task |
| 624 | * and may cease to exist at any time. Don't use or modify |
| 625 | * new_timer after the unlock call. |
| 626 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 627 | out: |
Oleg Nesterov | ef864c9 | 2008-09-22 14:42:49 -0700 | [diff] [blame] | 628 | release_posix_timer(new_timer, it_id_set); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 629 | return error; |
| 630 | } |
| 631 | |
| 632 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 633 | * Locking issues: We need to protect the result of the id look up until |
| 634 | * we get the timer locked down so it is not deleted under us. The |
| 635 | * removal is done under the idr spinlock so we use that here to bridge |
| 636 | * the find to the timer lock. To avoid a dead lock, the timer id MUST |
| 637 | * be release with out holding the timer lock. |
| 638 | */ |
Namhyung Kim | 20f33a0 | 2010-10-20 15:57:34 -0700 | [diff] [blame] | 639 | 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] | 640 | { |
| 641 | struct k_itimer *timr; |
| 642 | /* |
| 643 | * Watch out here. We do a irqsave on the idr_lock and pass the |
| 644 | * flags part over to the timer lock. Must not let interrupts in |
| 645 | * while we are moving the lock. |
| 646 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 647 | spin_lock_irqsave(&idr_lock, *flags); |
Oleg Nesterov | 31d9284 | 2008-09-22 14:42:51 -0700 | [diff] [blame] | 648 | timr = idr_find(&posix_timers_id, (int)timer_id); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 649 | if (timr) { |
| 650 | spin_lock(&timr->it_lock); |
Oleg Nesterov | 8999210 | 2008-12-01 14:18:15 -0800 | [diff] [blame] | 651 | if (timr->it_signal == current->signal) { |
Thomas Gleixner | 179394a | 2007-08-22 14:01:37 -0700 | [diff] [blame] | 652 | spin_unlock(&idr_lock); |
Oleg Nesterov | 31d9284 | 2008-09-22 14:42:51 -0700 | [diff] [blame] | 653 | return timr; |
| 654 | } |
| 655 | spin_unlock(&timr->it_lock); |
| 656 | } |
| 657 | spin_unlock_irqrestore(&idr_lock, *flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 658 | |
Oleg Nesterov | 31d9284 | 2008-09-22 14:42:51 -0700 | [diff] [blame] | 659 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 660 | } |
| 661 | |
| 662 | /* |
| 663 | * Get the time remaining on a POSIX.1b interval timer. This function |
| 664 | * is ALWAYS called with spin_lock_irq on the timer, thus it must not |
| 665 | * mess with irq. |
| 666 | * |
| 667 | * We have a couple of messes to clean up here. First there is the case |
| 668 | * of a timer that has a requeue pending. These timers should appear to |
| 669 | * be in the timer list with an expiry as if we were to requeue them |
| 670 | * now. |
| 671 | * |
| 672 | * The second issue is the SIGEV_NONE timer which may be active but is |
| 673 | * not really ever put in the timer list (to save system resources). |
| 674 | * This timer may be expired, and if so, we will do it here. Otherwise |
| 675 | * it is the same as a requeue pending timer WRT to what we should |
| 676 | * report. |
| 677 | */ |
| 678 | static void |
| 679 | common_timer_get(struct k_itimer *timr, struct itimerspec *cur_setting) |
| 680 | { |
Roman Zippel | 3b98a53 | 2006-03-26 01:38:07 -0800 | [diff] [blame] | 681 | ktime_t now, remaining, iv; |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 682 | struct hrtimer *timer = &timr->it.real.timer; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 683 | |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 684 | memset(cur_setting, 0, sizeof(struct itimerspec)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 685 | |
Roman Zippel | 3b98a53 | 2006-03-26 01:38:07 -0800 | [diff] [blame] | 686 | iv = timr->it.real.interval; |
| 687 | |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 688 | /* interval timer ? */ |
Roman Zippel | 3b98a53 | 2006-03-26 01:38:07 -0800 | [diff] [blame] | 689 | if (iv.tv64) |
| 690 | cur_setting->it_interval = ktime_to_timespec(iv); |
| 691 | else if (!hrtimer_active(timer) && |
| 692 | (timr->it_sigev_notify & ~SIGEV_THREAD_ID) != SIGEV_NONE) |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 693 | return; |
Roman Zippel | 3b98a53 | 2006-03-26 01:38:07 -0800 | [diff] [blame] | 694 | |
| 695 | now = timer->base->get_time(); |
| 696 | |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 697 | /* |
Roman Zippel | 3b98a53 | 2006-03-26 01:38:07 -0800 | [diff] [blame] | 698 | * When a requeue is pending or this is a SIGEV_NONE |
| 699 | * timer move the expiry time forward by intervals, so |
| 700 | * expiry is > now. |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 701 | */ |
Roman Zippel | 3b98a53 | 2006-03-26 01:38:07 -0800 | [diff] [blame] | 702 | if (iv.tv64 && (timr->it_requeue_pending & REQUEUE_PENDING || |
| 703 | (timr->it_sigev_notify & ~SIGEV_THREAD_ID) == SIGEV_NONE)) |
Davide Libenzi | 4d672e7 | 2008-02-04 22:27:26 -0800 | [diff] [blame] | 704 | timr->it_overrun += (unsigned int) hrtimer_forward(timer, now, iv); |
Roman Zippel | 3b98a53 | 2006-03-26 01:38:07 -0800 | [diff] [blame] | 705 | |
Arjan van de Ven | cc584b2 | 2008-09-01 15:02:30 -0700 | [diff] [blame] | 706 | remaining = ktime_sub(hrtimer_get_expires(timer), now); |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 707 | /* Return 0 only, when the timer is expired and not pending */ |
Roman Zippel | 3b98a53 | 2006-03-26 01:38:07 -0800 | [diff] [blame] | 708 | if (remaining.tv64 <= 0) { |
| 709 | /* |
| 710 | * A single shot SIGEV_NONE timer must return 0, when |
| 711 | * it is expired ! |
| 712 | */ |
| 713 | if ((timr->it_sigev_notify & ~SIGEV_THREAD_ID) != SIGEV_NONE) |
| 714 | cur_setting->it_value.tv_nsec = 1; |
| 715 | } else |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 716 | cur_setting->it_value = ktime_to_timespec(remaining); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 717 | } |
| 718 | |
| 719 | /* Get the time remaining on a POSIX.1b interval timer. */ |
Heiko Carstens | 362e9c0 | 2009-01-14 14:14:07 +0100 | [diff] [blame] | 720 | SYSCALL_DEFINE2(timer_gettime, timer_t, timer_id, |
| 721 | struct itimerspec __user *, setting) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 722 | { |
| 723 | struct k_itimer *timr; |
| 724 | struct itimerspec cur_setting; |
| 725 | unsigned long flags; |
| 726 | |
| 727 | timr = lock_timer(timer_id, &flags); |
| 728 | if (!timr) |
| 729 | return -EINVAL; |
| 730 | |
| 731 | CLOCK_DISPATCH(timr->it_clock, timer_get, (timr, &cur_setting)); |
| 732 | |
| 733 | unlock_timer(timr, flags); |
| 734 | |
| 735 | if (copy_to_user(setting, &cur_setting, sizeof (cur_setting))) |
| 736 | return -EFAULT; |
| 737 | |
| 738 | return 0; |
| 739 | } |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 740 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 741 | /* |
| 742 | * Get the number of overruns of a POSIX.1b interval timer. This is to |
| 743 | * be the overrun of the timer last delivered. At the same time we are |
| 744 | * accumulating overruns on the next timer. The overrun is frozen when |
| 745 | * the signal is delivered, either at the notify time (if the info block |
| 746 | * is not queued) or at the actual delivery time (as we are informed by |
| 747 | * the call back to do_schedule_next_timer(). So all we need to do is |
| 748 | * to pick up the frozen overrun. |
| 749 | */ |
Heiko Carstens | 362e9c0 | 2009-01-14 14:14:07 +0100 | [diff] [blame] | 750 | SYSCALL_DEFINE1(timer_getoverrun, timer_t, timer_id) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 751 | { |
| 752 | struct k_itimer *timr; |
| 753 | int overrun; |
Al Viro | 5ba2533 | 2007-10-14 19:35:50 +0100 | [diff] [blame] | 754 | unsigned long flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 755 | |
| 756 | timr = lock_timer(timer_id, &flags); |
| 757 | if (!timr) |
| 758 | return -EINVAL; |
| 759 | |
| 760 | overrun = timr->it_overrun_last; |
| 761 | unlock_timer(timr, flags); |
| 762 | |
| 763 | return overrun; |
| 764 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 765 | |
| 766 | /* Set a POSIX.1b interval timer. */ |
| 767 | /* timr->it_lock is taken. */ |
Arjan van de Ven | 858119e | 2006-01-14 13:20:43 -0800 | [diff] [blame] | 768 | static int |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 769 | common_timer_set(struct k_itimer *timr, int flags, |
| 770 | struct itimerspec *new_setting, struct itimerspec *old_setting) |
| 771 | { |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 772 | struct hrtimer *timer = &timr->it.real.timer; |
George Anzinger | 7978672c | 2006-02-01 03:05:11 -0800 | [diff] [blame] | 773 | enum hrtimer_mode mode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 774 | |
| 775 | if (old_setting) |
| 776 | common_timer_get(timr, old_setting); |
| 777 | |
| 778 | /* disable the timer */ |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 779 | timr->it.real.interval.tv64 = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 780 | /* |
| 781 | * careful here. If smp we could be in the "fire" routine which will |
| 782 | * be spinning as we hold the lock. But this is ONLY an SMP issue. |
| 783 | */ |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 784 | if (hrtimer_try_to_cancel(timer) < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 785 | return TIMER_RETRY; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 786 | |
| 787 | timr->it_requeue_pending = (timr->it_requeue_pending + 2) & |
| 788 | ~REQUEUE_PENDING; |
| 789 | timr->it_overrun_last = 0; |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 790 | |
| 791 | /* switch off the timer when it_value is zero */ |
| 792 | 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] | 793 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 794 | |
Thomas Gleixner | c9cb2e3 | 2007-02-16 01:27:49 -0800 | [diff] [blame] | 795 | mode = flags & TIMER_ABSTIME ? HRTIMER_MODE_ABS : HRTIMER_MODE_REL; |
George Anzinger | 7978672c | 2006-02-01 03:05:11 -0800 | [diff] [blame] | 796 | hrtimer_init(&timr->it.real.timer, timr->it_clock, mode); |
George Anzinger | 7978672c | 2006-02-01 03:05:11 -0800 | [diff] [blame] | 797 | timr->it.real.timer.function = posix_timer_fn; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 798 | |
Arjan van de Ven | cc584b2 | 2008-09-01 15:02:30 -0700 | [diff] [blame] | 799 | hrtimer_set_expires(timer, timespec_to_ktime(new_setting->it_value)); |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 800 | |
| 801 | /* Convert interval */ |
| 802 | timr->it.real.interval = timespec_to_ktime(new_setting->it_interval); |
| 803 | |
| 804 | /* SIGEV_NONE timers are not queued ! See common_timer_get */ |
Thomas Gleixner | 952bbc8 | 2006-02-01 03:05:13 -0800 | [diff] [blame] | 805 | if (((timr->it_sigev_notify & ~SIGEV_THREAD_ID) == SIGEV_NONE)) { |
| 806 | /* Setup correct expiry time for relative timers */ |
Thomas Gleixner | 5a7780e | 2008-02-13 09:20:43 +0100 | [diff] [blame] | 807 | if (mode == HRTIMER_MODE_REL) { |
Arjan van de Ven | cc584b2 | 2008-09-01 15:02:30 -0700 | [diff] [blame] | 808 | hrtimer_add_expires(timer, timer->base->get_time()); |
Thomas Gleixner | 5a7780e | 2008-02-13 09:20:43 +0100 | [diff] [blame] | 809 | } |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 810 | return 0; |
Thomas Gleixner | 952bbc8 | 2006-02-01 03:05:13 -0800 | [diff] [blame] | 811 | } |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 812 | |
Arjan van de Ven | cc584b2 | 2008-09-01 15:02:30 -0700 | [diff] [blame] | 813 | hrtimer_start_expires(timer, mode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 814 | return 0; |
| 815 | } |
| 816 | |
| 817 | /* Set a POSIX.1b interval timer */ |
Heiko Carstens | 362e9c0 | 2009-01-14 14:14:07 +0100 | [diff] [blame] | 818 | SYSCALL_DEFINE4(timer_settime, timer_t, timer_id, int, flags, |
| 819 | const struct itimerspec __user *, new_setting, |
| 820 | struct itimerspec __user *, old_setting) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 821 | { |
| 822 | struct k_itimer *timr; |
| 823 | struct itimerspec new_spec, old_spec; |
| 824 | int error = 0; |
Al Viro | 5ba2533 | 2007-10-14 19:35:50 +0100 | [diff] [blame] | 825 | unsigned long flag; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 826 | struct itimerspec *rtn = old_setting ? &old_spec : NULL; |
| 827 | |
| 828 | if (!new_setting) |
| 829 | return -EINVAL; |
| 830 | |
| 831 | if (copy_from_user(&new_spec, new_setting, sizeof (new_spec))) |
| 832 | return -EFAULT; |
| 833 | |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 834 | if (!timespec_valid(&new_spec.it_interval) || |
| 835 | !timespec_valid(&new_spec.it_value)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 836 | return -EINVAL; |
| 837 | retry: |
| 838 | timr = lock_timer(timer_id, &flag); |
| 839 | if (!timr) |
| 840 | return -EINVAL; |
| 841 | |
| 842 | error = CLOCK_DISPATCH(timr->it_clock, timer_set, |
| 843 | (timr, flags, &new_spec, rtn)); |
| 844 | |
| 845 | unlock_timer(timr, flag); |
| 846 | if (error == TIMER_RETRY) { |
| 847 | rtn = NULL; // We already got the old time... |
| 848 | goto retry; |
| 849 | } |
| 850 | |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 851 | if (old_setting && !error && |
| 852 | copy_to_user(old_setting, &old_spec, sizeof (old_spec))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 853 | error = -EFAULT; |
| 854 | |
| 855 | return error; |
| 856 | } |
| 857 | |
| 858 | static inline int common_timer_del(struct k_itimer *timer) |
| 859 | { |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 860 | timer->it.real.interval.tv64 = 0; |
Oleg Nesterov | f972be3 | 2005-06-23 00:09:00 -0700 | [diff] [blame] | 861 | |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 862 | if (hrtimer_try_to_cancel(&timer->it.real.timer) < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 863 | return TIMER_RETRY; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 864 | return 0; |
| 865 | } |
| 866 | |
| 867 | static inline int timer_delete_hook(struct k_itimer *timer) |
| 868 | { |
| 869 | return CLOCK_DISPATCH(timer->it_clock, timer_del, (timer)); |
| 870 | } |
| 871 | |
| 872 | /* Delete a POSIX.1b interval timer. */ |
Heiko Carstens | 362e9c0 | 2009-01-14 14:14:07 +0100 | [diff] [blame] | 873 | SYSCALL_DEFINE1(timer_delete, timer_t, timer_id) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 874 | { |
| 875 | struct k_itimer *timer; |
Al Viro | 5ba2533 | 2007-10-14 19:35:50 +0100 | [diff] [blame] | 876 | unsigned long flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 877 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 878 | retry_delete: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 879 | timer = lock_timer(timer_id, &flags); |
| 880 | if (!timer) |
| 881 | return -EINVAL; |
| 882 | |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 883 | if (timer_delete_hook(timer) == TIMER_RETRY) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 884 | unlock_timer(timer, flags); |
| 885 | goto retry_delete; |
| 886 | } |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 887 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 888 | spin_lock(¤t->sighand->siglock); |
| 889 | list_del(&timer->list); |
| 890 | spin_unlock(¤t->sighand->siglock); |
| 891 | /* |
| 892 | * This keeps any tasks waiting on the spin lock from thinking |
| 893 | * they got something (see the lock code above). |
| 894 | */ |
Oleg Nesterov | 8999210 | 2008-12-01 14:18:15 -0800 | [diff] [blame] | 895 | timer->it_signal = NULL; |
Oleg Nesterov | 4b7a130 | 2008-07-25 01:47:26 -0700 | [diff] [blame] | 896 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 897 | unlock_timer(timer, flags); |
| 898 | release_posix_timer(timer, IT_ID_SET); |
| 899 | return 0; |
| 900 | } |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 901 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 902 | /* |
| 903 | * return timer owned by the process, used by exit_itimers |
| 904 | */ |
Arjan van de Ven | 858119e | 2006-01-14 13:20:43 -0800 | [diff] [blame] | 905 | static void itimer_delete(struct k_itimer *timer) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 906 | { |
| 907 | unsigned long flags; |
| 908 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 909 | retry_delete: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 910 | spin_lock_irqsave(&timer->it_lock, flags); |
| 911 | |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 912 | if (timer_delete_hook(timer) == TIMER_RETRY) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 913 | unlock_timer(timer, flags); |
| 914 | goto retry_delete; |
| 915 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 916 | list_del(&timer->list); |
| 917 | /* |
| 918 | * This keeps any tasks waiting on the spin lock from thinking |
| 919 | * they got something (see the lock code above). |
| 920 | */ |
Oleg Nesterov | 8999210 | 2008-12-01 14:18:15 -0800 | [diff] [blame] | 921 | timer->it_signal = NULL; |
Oleg Nesterov | 4b7a130 | 2008-07-25 01:47:26 -0700 | [diff] [blame] | 922 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 923 | unlock_timer(timer, flags); |
| 924 | release_posix_timer(timer, IT_ID_SET); |
| 925 | } |
| 926 | |
| 927 | /* |
Roland McGrath | 25f407f | 2005-10-21 15:03:29 -0700 | [diff] [blame] | 928 | * 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] | 929 | * references to the shared signal_struct. |
| 930 | */ |
| 931 | void exit_itimers(struct signal_struct *sig) |
| 932 | { |
| 933 | struct k_itimer *tmr; |
| 934 | |
| 935 | while (!list_empty(&sig->posix_timers)) { |
| 936 | tmr = list_entry(sig->posix_timers.next, struct k_itimer, list); |
| 937 | itimer_delete(tmr); |
| 938 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 939 | } |
| 940 | |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 941 | /* Not available / possible... functions */ |
Richard Cochran | 1e6d767 | 2011-02-01 13:50:58 +0000 | [diff] [blame] | 942 | int do_posix_clock_nosettime(const clockid_t clockid, const struct timespec *tp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 943 | { |
| 944 | return -EINVAL; |
| 945 | } |
| 946 | EXPORT_SYMBOL_GPL(do_posix_clock_nosettime); |
| 947 | |
Heiko Carstens | 362e9c0 | 2009-01-14 14:14:07 +0100 | [diff] [blame] | 948 | SYSCALL_DEFINE2(clock_settime, const clockid_t, which_clock, |
| 949 | const struct timespec __user *, tp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 950 | { |
| 951 | struct timespec new_tp; |
| 952 | |
| 953 | if (invalid_clockid(which_clock)) |
| 954 | return -EINVAL; |
| 955 | if (copy_from_user(&new_tp, tp, sizeof (*tp))) |
| 956 | return -EFAULT; |
| 957 | |
| 958 | return CLOCK_DISPATCH(which_clock, clock_set, (which_clock, &new_tp)); |
| 959 | } |
| 960 | |
Heiko Carstens | 362e9c0 | 2009-01-14 14:14:07 +0100 | [diff] [blame] | 961 | SYSCALL_DEFINE2(clock_gettime, const clockid_t, which_clock, |
| 962 | struct timespec __user *,tp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 963 | { |
| 964 | struct timespec kernel_tp; |
| 965 | int error; |
| 966 | |
| 967 | if (invalid_clockid(which_clock)) |
| 968 | return -EINVAL; |
| 969 | error = CLOCK_DISPATCH(which_clock, clock_get, |
| 970 | (which_clock, &kernel_tp)); |
| 971 | if (!error && copy_to_user(tp, &kernel_tp, sizeof (kernel_tp))) |
| 972 | error = -EFAULT; |
| 973 | |
| 974 | return error; |
| 975 | |
| 976 | } |
| 977 | |
Heiko Carstens | 362e9c0 | 2009-01-14 14:14:07 +0100 | [diff] [blame] | 978 | SYSCALL_DEFINE2(clock_getres, const clockid_t, which_clock, |
| 979 | struct timespec __user *, tp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 980 | { |
| 981 | struct timespec rtn_tp; |
| 982 | int error; |
| 983 | |
| 984 | if (invalid_clockid(which_clock)) |
| 985 | return -EINVAL; |
| 986 | |
| 987 | error = CLOCK_DISPATCH(which_clock, clock_getres, |
| 988 | (which_clock, &rtn_tp)); |
| 989 | |
| 990 | if (!error && tp && copy_to_user(tp, &rtn_tp, sizeof (rtn_tp))) { |
| 991 | error = -EFAULT; |
| 992 | } |
| 993 | |
| 994 | return error; |
| 995 | } |
| 996 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 997 | /* |
Thomas Gleixner | 97735f2 | 2006-01-09 20:52:37 -0800 | [diff] [blame] | 998 | * nanosleep for monotonic and realtime clocks |
| 999 | */ |
| 1000 | static int common_nsleep(const clockid_t which_clock, int flags, |
| 1001 | struct timespec *tsave, struct timespec __user *rmtp) |
| 1002 | { |
Oleg Nesterov | 080344b | 2008-02-01 17:29:05 +0300 | [diff] [blame] | 1003 | return hrtimer_nanosleep(tsave, rmtp, flags & TIMER_ABSTIME ? |
| 1004 | HRTIMER_MODE_ABS : HRTIMER_MODE_REL, |
| 1005 | which_clock); |
Thomas Gleixner | 97735f2 | 2006-01-09 20:52:37 -0800 | [diff] [blame] | 1006 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1007 | |
Heiko Carstens | 362e9c0 | 2009-01-14 14:14:07 +0100 | [diff] [blame] | 1008 | SYSCALL_DEFINE4(clock_nanosleep, const clockid_t, which_clock, int, flags, |
| 1009 | const struct timespec __user *, rqtp, |
| 1010 | struct timespec __user *, rmtp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1011 | { |
Thomas Gleixner | a5cd288 | 2011-02-01 13:51:11 +0000 | [diff] [blame^] | 1012 | struct k_clock *kc = clockid_to_kclock(which_clock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1013 | struct timespec t; |
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 | if (!kc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1016 | return -EINVAL; |
Thomas Gleixner | a5cd288 | 2011-02-01 13:51:11 +0000 | [diff] [blame^] | 1017 | if (!kc->nsleep) |
| 1018 | return -ENANOSLEEP_NOTSUP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1019 | |
| 1020 | if (copy_from_user(&t, rqtp, sizeof (struct timespec))) |
| 1021 | return -EFAULT; |
| 1022 | |
Thomas Gleixner | 5f82b2b | 2006-01-09 20:52:29 -0800 | [diff] [blame] | 1023 | if (!timespec_valid(&t)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1024 | return -EINVAL; |
| 1025 | |
Thomas Gleixner | a5cd288 | 2011-02-01 13:51:11 +0000 | [diff] [blame^] | 1026 | return kc->nsleep(which_clock, flags, &t, rmtp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1027 | } |
Toyo Abe | 1711ef3 | 2006-09-29 02:00:28 -0700 | [diff] [blame] | 1028 | |
| 1029 | /* |
| 1030 | * nanosleep_restart for monotonic and realtime clocks |
| 1031 | */ |
| 1032 | static int common_nsleep_restart(struct restart_block *restart_block) |
| 1033 | { |
| 1034 | return hrtimer_nanosleep_restart(restart_block); |
| 1035 | } |
| 1036 | |
| 1037 | /* |
| 1038 | * This will restart clock_nanosleep. This is required only by |
| 1039 | * compat_clock_nanosleep_restart for now. |
| 1040 | */ |
| 1041 | long |
| 1042 | clock_nanosleep_restart(struct restart_block *restart_block) |
| 1043 | { |
| 1044 | clockid_t which_clock = restart_block->arg0; |
| 1045 | |
| 1046 | return CLOCK_DISPATCH(which_clock, nsleep_restart, |
| 1047 | (restart_block)); |
| 1048 | } |