Commit | Line | Data |
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1da177e4 | 1 | /* |
f30c2269 | 2 | * linux/kernel/posix-timers.c |
1da177e4 LT |
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> | |
1da177e4 LT |
34 | #include <linux/interrupt.h> |
35 | #include <linux/slab.h> | |
36 | #include <linux/time.h> | |
97d1f15b | 37 | #include <linux/mutex.h> |
61855b6b | 38 | #include <linux/sched/task.h> |
1da177e4 | 39 | |
7c0f6ba6 | 40 | #include <linux/uaccess.h> |
1da177e4 LT |
41 | #include <linux/list.h> |
42 | #include <linux/init.h> | |
43 | #include <linux/compiler.h> | |
5ed67f05 | 44 | #include <linux/hash.h> |
0606f422 | 45 | #include <linux/posix-clock.h> |
1da177e4 LT |
46 | #include <linux/posix-timers.h> |
47 | #include <linux/syscalls.h> | |
48 | #include <linux/wait.h> | |
49 | #include <linux/workqueue.h> | |
9984de1a | 50 | #include <linux/export.h> |
5ed67f05 | 51 | #include <linux/hashtable.h> |
1da177e4 | 52 | |
8b094cd0 TG |
53 | #include "timekeeping.h" |
54 | ||
1da177e4 | 55 | /* |
5ed67f05 PE |
56 | * Management arrays for POSIX timers. Timers are now kept in static hash table |
57 | * with 512 entries. | |
58 | * Timer ids are allocated by local routine, which selects proper hash head by | |
59 | * key, constructed from current->signal address and per signal struct counter. | |
60 | * This keeps timer ids unique per process, but now they can intersect between | |
61 | * processes. | |
1da177e4 LT |
62 | */ |
63 | ||
64 | /* | |
65 | * Lets keep our timers in a slab cache :-) | |
66 | */ | |
e18b890b | 67 | static struct kmem_cache *posix_timers_cache; |
5ed67f05 PE |
68 | |
69 | static DEFINE_HASHTABLE(posix_timers_hashtable, 9); | |
70 | static DEFINE_SPINLOCK(hash_lock); | |
1da177e4 | 71 | |
1da177e4 LT |
72 | /* |
73 | * we assume that the new SIGEV_THREAD_ID shares no bits with the other | |
74 | * SIGEV values. Here we put out an error if this assumption fails. | |
75 | */ | |
76 | #if SIGEV_THREAD_ID != (SIGEV_THREAD_ID & \ | |
77 | ~(SIGEV_SIGNAL | SIGEV_NONE | SIGEV_THREAD)) | |
78 | #error "SIGEV_THREAD_ID must not share bit with other SIGEV values!" | |
79 | #endif | |
80 | ||
65da528d TG |
81 | /* |
82 | * parisc wants ENOTSUP instead of EOPNOTSUPP | |
83 | */ | |
84 | #ifndef ENOTSUP | |
85 | # define ENANOSLEEP_NOTSUP EOPNOTSUPP | |
86 | #else | |
87 | # define ENANOSLEEP_NOTSUP ENOTSUP | |
88 | #endif | |
1da177e4 LT |
89 | |
90 | /* | |
91 | * The timer ID is turned into a timer address by idr_find(). | |
92 | * Verifying a valid ID consists of: | |
93 | * | |
94 | * a) checking that idr_find() returns other than -1. | |
95 | * b) checking that the timer id matches the one in the timer itself. | |
96 | * c) that the timer owner is in the callers thread group. | |
97 | */ | |
98 | ||
99 | /* | |
100 | * CLOCKs: The POSIX standard calls for a couple of clocks and allows us | |
101 | * to implement others. This structure defines the various | |
0061748d | 102 | * clocks. |
1da177e4 LT |
103 | * |
104 | * RESOLUTION: Clock resolution is used to round up timer and interval | |
105 | * times, NOT to report clock times, which are reported with as | |
106 | * much resolution as the system can muster. In some cases this | |
107 | * resolution may depend on the underlying clock hardware and | |
108 | * may not be quantifiable until run time, and only then is the | |
109 | * necessary code is written. The standard says we should say | |
110 | * something about this issue in the documentation... | |
111 | * | |
0061748d RC |
112 | * FUNCTIONS: The CLOCKs structure defines possible functions to |
113 | * handle various clock functions. | |
1da177e4 | 114 | * |
0061748d RC |
115 | * The standard POSIX timer management code assumes the |
116 | * following: 1.) The k_itimer struct (sched.h) is used for | |
117 | * the timer. 2.) The list, it_lock, it_clock, it_id and | |
118 | * it_pid fields are not modified by timer code. | |
1da177e4 LT |
119 | * |
120 | * Permissions: It is assumed that the clock_settime() function defined | |
121 | * for each clock will take care of permission checks. Some | |
122 | * clocks may be set able by any user (i.e. local process | |
123 | * clocks) others not. Currently the only set able clock we | |
124 | * have is CLOCK_REALTIME and its high res counter part, both of | |
125 | * which we beg off on and pass to do_sys_settimeofday(). | |
126 | */ | |
127 | ||
128 | static struct k_clock posix_clocks[MAX_CLOCKS]; | |
becf8b5d | 129 | |
1da177e4 | 130 | /* |
becf8b5d | 131 | * These ones are defined below. |
1da177e4 | 132 | */ |
becf8b5d TG |
133 | static int common_nsleep(const clockid_t, int flags, struct timespec *t, |
134 | struct timespec __user *rmtp); | |
838394fb | 135 | static int common_timer_create(struct k_itimer *new_timer); |
becf8b5d TG |
136 | static void common_timer_get(struct k_itimer *, struct itimerspec *); |
137 | static int common_timer_set(struct k_itimer *, int, | |
138 | struct itimerspec *, struct itimerspec *); | |
139 | static int common_timer_del(struct k_itimer *timer); | |
1da177e4 | 140 | |
c9cb2e3d | 141 | static enum hrtimer_restart posix_timer_fn(struct hrtimer *data); |
1da177e4 | 142 | |
20f33a03 NK |
143 | static struct k_itimer *__lock_timer(timer_t timer_id, unsigned long *flags); |
144 | ||
145 | #define lock_timer(tid, flags) \ | |
146 | ({ struct k_itimer *__timr; \ | |
147 | __cond_lock(&__timr->it_lock, __timr = __lock_timer(tid, flags)); \ | |
148 | __timr; \ | |
149 | }) | |
1da177e4 | 150 | |
5ed67f05 PE |
151 | static int hash(struct signal_struct *sig, unsigned int nr) |
152 | { | |
153 | return hash_32(hash32_ptr(sig) ^ nr, HASH_BITS(posix_timers_hashtable)); | |
154 | } | |
155 | ||
156 | static struct k_itimer *__posix_timers_find(struct hlist_head *head, | |
157 | struct signal_struct *sig, | |
158 | timer_t id) | |
159 | { | |
5ed67f05 PE |
160 | struct k_itimer *timer; |
161 | ||
162 | hlist_for_each_entry_rcu(timer, head, t_hash) { | |
163 | if ((timer->it_signal == sig) && (timer->it_id == id)) | |
164 | return timer; | |
165 | } | |
166 | return NULL; | |
167 | } | |
168 | ||
169 | static struct k_itimer *posix_timer_by_id(timer_t id) | |
170 | { | |
171 | struct signal_struct *sig = current->signal; | |
172 | struct hlist_head *head = &posix_timers_hashtable[hash(sig, id)]; | |
173 | ||
174 | return __posix_timers_find(head, sig, id); | |
175 | } | |
176 | ||
177 | static int posix_timer_add(struct k_itimer *timer) | |
178 | { | |
179 | struct signal_struct *sig = current->signal; | |
180 | int first_free_id = sig->posix_timer_id; | |
181 | struct hlist_head *head; | |
182 | int ret = -ENOENT; | |
183 | ||
184 | do { | |
185 | spin_lock(&hash_lock); | |
186 | head = &posix_timers_hashtable[hash(sig, sig->posix_timer_id)]; | |
187 | if (!__posix_timers_find(head, sig, sig->posix_timer_id)) { | |
188 | hlist_add_head_rcu(&timer->t_hash, head); | |
189 | ret = sig->posix_timer_id; | |
190 | } | |
191 | if (++sig->posix_timer_id < 0) | |
192 | sig->posix_timer_id = 0; | |
193 | if ((sig->posix_timer_id == first_free_id) && (ret == -ENOENT)) | |
194 | /* Loop over all possible ids completed */ | |
195 | ret = -EAGAIN; | |
196 | spin_unlock(&hash_lock); | |
197 | } while (ret == -ENOENT); | |
198 | return ret; | |
199 | } | |
200 | ||
1da177e4 LT |
201 | static inline void unlock_timer(struct k_itimer *timr, unsigned long flags) |
202 | { | |
203 | spin_unlock_irqrestore(&timr->it_lock, flags); | |
204 | } | |
205 | ||
42285777 TG |
206 | /* Get clock_realtime */ |
207 | static int posix_clock_realtime_get(clockid_t which_clock, struct timespec *tp) | |
208 | { | |
209 | ktime_get_real_ts(tp); | |
210 | return 0; | |
211 | } | |
212 | ||
26f9a479 TG |
213 | /* Set clock_realtime */ |
214 | static int posix_clock_realtime_set(const clockid_t which_clock, | |
215 | const struct timespec *tp) | |
216 | { | |
2ac00f17 DD |
217 | struct timespec64 tp64; |
218 | ||
219 | tp64 = timespec_to_timespec64(*tp); | |
220 | return do_sys_settimeofday64(&tp64, NULL); | |
26f9a479 TG |
221 | } |
222 | ||
f1f1d5eb RC |
223 | static int posix_clock_realtime_adj(const clockid_t which_clock, |
224 | struct timex *t) | |
225 | { | |
226 | return do_adjtimex(t); | |
227 | } | |
228 | ||
becf8b5d TG |
229 | /* |
230 | * Get monotonic time for posix timers | |
231 | */ | |
232 | static int posix_ktime_get_ts(clockid_t which_clock, struct timespec *tp) | |
233 | { | |
234 | ktime_get_ts(tp); | |
235 | return 0; | |
236 | } | |
1da177e4 | 237 | |
2d42244a | 238 | /* |
7fdd7f89 | 239 | * Get monotonic-raw time for posix timers |
2d42244a JS |
240 | */ |
241 | static int posix_get_monotonic_raw(clockid_t which_clock, struct timespec *tp) | |
242 | { | |
243 | getrawmonotonic(tp); | |
244 | return 0; | |
245 | } | |
246 | ||
da15cfda | 247 | |
248 | static int posix_get_realtime_coarse(clockid_t which_clock, struct timespec *tp) | |
249 | { | |
250 | *tp = current_kernel_time(); | |
251 | return 0; | |
252 | } | |
253 | ||
254 | static int posix_get_monotonic_coarse(clockid_t which_clock, | |
255 | struct timespec *tp) | |
256 | { | |
257 | *tp = get_monotonic_coarse(); | |
258 | return 0; | |
259 | } | |
260 | ||
6622e670 | 261 | static int posix_get_coarse_res(const clockid_t which_clock, struct timespec *tp) |
da15cfda | 262 | { |
263 | *tp = ktime_to_timespec(KTIME_LOW_RES); | |
264 | return 0; | |
265 | } | |
7fdd7f89 JS |
266 | |
267 | static int posix_get_boottime(const clockid_t which_clock, struct timespec *tp) | |
268 | { | |
269 | get_monotonic_boottime(tp); | |
270 | return 0; | |
271 | } | |
272 | ||
1ff3c967 JS |
273 | static int posix_get_tai(clockid_t which_clock, struct timespec *tp) |
274 | { | |
275 | timekeeping_clocktai(tp); | |
276 | return 0; | |
277 | } | |
7fdd7f89 | 278 | |
056a3cac TG |
279 | static int posix_get_hrtimer_res(clockid_t which_clock, struct timespec *tp) |
280 | { | |
281 | tp->tv_sec = 0; | |
282 | tp->tv_nsec = hrtimer_resolution; | |
283 | return 0; | |
284 | } | |
285 | ||
1da177e4 LT |
286 | /* |
287 | * Initialize everything, well, just everything in Posix clocks/timers ;) | |
288 | */ | |
289 | static __init int init_posix_timers(void) | |
290 | { | |
becf8b5d | 291 | struct k_clock clock_realtime = { |
056a3cac | 292 | .clock_getres = posix_get_hrtimer_res, |
42285777 | 293 | .clock_get = posix_clock_realtime_get, |
26f9a479 | 294 | .clock_set = posix_clock_realtime_set, |
f1f1d5eb | 295 | .clock_adj = posix_clock_realtime_adj, |
a5cd2880 | 296 | .nsleep = common_nsleep, |
59bd5bc2 | 297 | .nsleep_restart = hrtimer_nanosleep_restart, |
838394fb | 298 | .timer_create = common_timer_create, |
27722df1 | 299 | .timer_set = common_timer_set, |
a7319fa2 | 300 | .timer_get = common_timer_get, |
6761c670 | 301 | .timer_del = common_timer_del, |
1da177e4 | 302 | }; |
becf8b5d | 303 | struct k_clock clock_monotonic = { |
056a3cac | 304 | .clock_getres = posix_get_hrtimer_res, |
2fd1f040 | 305 | .clock_get = posix_ktime_get_ts, |
a5cd2880 | 306 | .nsleep = common_nsleep, |
59bd5bc2 | 307 | .nsleep_restart = hrtimer_nanosleep_restart, |
838394fb | 308 | .timer_create = common_timer_create, |
27722df1 | 309 | .timer_set = common_timer_set, |
a7319fa2 | 310 | .timer_get = common_timer_get, |
6761c670 | 311 | .timer_del = common_timer_del, |
1da177e4 | 312 | }; |
2d42244a | 313 | struct k_clock clock_monotonic_raw = { |
056a3cac | 314 | .clock_getres = posix_get_hrtimer_res, |
2fd1f040 | 315 | .clock_get = posix_get_monotonic_raw, |
2d42244a | 316 | }; |
da15cfda | 317 | struct k_clock clock_realtime_coarse = { |
2fd1f040 TG |
318 | .clock_getres = posix_get_coarse_res, |
319 | .clock_get = posix_get_realtime_coarse, | |
da15cfda | 320 | }; |
321 | struct k_clock clock_monotonic_coarse = { | |
2fd1f040 TG |
322 | .clock_getres = posix_get_coarse_res, |
323 | .clock_get = posix_get_monotonic_coarse, | |
da15cfda | 324 | }; |
1ff3c967 | 325 | struct k_clock clock_tai = { |
056a3cac | 326 | .clock_getres = posix_get_hrtimer_res, |
1ff3c967 | 327 | .clock_get = posix_get_tai, |
90adda98 JS |
328 | .nsleep = common_nsleep, |
329 | .nsleep_restart = hrtimer_nanosleep_restart, | |
330 | .timer_create = common_timer_create, | |
331 | .timer_set = common_timer_set, | |
332 | .timer_get = common_timer_get, | |
333 | .timer_del = common_timer_del, | |
1ff3c967 | 334 | }; |
7fdd7f89 | 335 | struct k_clock clock_boottime = { |
056a3cac | 336 | .clock_getres = posix_get_hrtimer_res, |
7fdd7f89 JS |
337 | .clock_get = posix_get_boottime, |
338 | .nsleep = common_nsleep, | |
339 | .nsleep_restart = hrtimer_nanosleep_restart, | |
340 | .timer_create = common_timer_create, | |
341 | .timer_set = common_timer_set, | |
342 | .timer_get = common_timer_get, | |
343 | .timer_del = common_timer_del, | |
344 | }; | |
1da177e4 | 345 | |
52708737 TG |
346 | posix_timers_register_clock(CLOCK_REALTIME, &clock_realtime); |
347 | posix_timers_register_clock(CLOCK_MONOTONIC, &clock_monotonic); | |
348 | posix_timers_register_clock(CLOCK_MONOTONIC_RAW, &clock_monotonic_raw); | |
349 | posix_timers_register_clock(CLOCK_REALTIME_COARSE, &clock_realtime_coarse); | |
350 | posix_timers_register_clock(CLOCK_MONOTONIC_COARSE, &clock_monotonic_coarse); | |
7fdd7f89 | 351 | posix_timers_register_clock(CLOCK_BOOTTIME, &clock_boottime); |
1ff3c967 | 352 | posix_timers_register_clock(CLOCK_TAI, &clock_tai); |
1da177e4 LT |
353 | |
354 | posix_timers_cache = kmem_cache_create("posix_timers_cache", | |
040b5c6f AD |
355 | sizeof (struct k_itimer), 0, SLAB_PANIC, |
356 | NULL); | |
1da177e4 LT |
357 | return 0; |
358 | } | |
359 | ||
360 | __initcall(init_posix_timers); | |
361 | ||
1da177e4 LT |
362 | static void schedule_next_timer(struct k_itimer *timr) |
363 | { | |
44f21475 RZ |
364 | struct hrtimer *timer = &timr->it.real.timer; |
365 | ||
2456e855 | 366 | if (timr->it.real.interval == 0) |
1da177e4 LT |
367 | return; |
368 | ||
4d672e7a DL |
369 | timr->it_overrun += (unsigned int) hrtimer_forward(timer, |
370 | timer->base->get_time(), | |
371 | timr->it.real.interval); | |
44f21475 | 372 | |
1da177e4 LT |
373 | timr->it_overrun_last = timr->it_overrun; |
374 | timr->it_overrun = -1; | |
375 | ++timr->it_requeue_pending; | |
44f21475 | 376 | hrtimer_restart(timer); |
1da177e4 LT |
377 | } |
378 | ||
379 | /* | |
380 | * This function is exported for use by the signal deliver code. It is | |
381 | * called just prior to the info block being released and passes that | |
382 | * block to us. It's function is to update the overrun entry AND to | |
383 | * restart the timer. It should only be called if the timer is to be | |
384 | * restarted (i.e. we have flagged this in the sys_private entry of the | |
385 | * info block). | |
386 | * | |
25985edc | 387 | * To protect against the timer going away while the interrupt is queued, |
1da177e4 LT |
388 | * we require that the it_requeue_pending flag be set. |
389 | */ | |
390 | void do_schedule_next_timer(struct siginfo *info) | |
391 | { | |
392 | struct k_itimer *timr; | |
393 | unsigned long flags; | |
394 | ||
395 | timr = lock_timer(info->si_tid, &flags); | |
396 | ||
becf8b5d TG |
397 | if (timr && timr->it_requeue_pending == info->si_sys_private) { |
398 | if (timr->it_clock < 0) | |
399 | posix_cpu_timer_schedule(timr); | |
400 | else | |
401 | schedule_next_timer(timr); | |
1da177e4 | 402 | |
54da1174 | 403 | info->si_overrun += timr->it_overrun_last; |
becf8b5d TG |
404 | } |
405 | ||
b6557fbc TG |
406 | if (timr) |
407 | unlock_timer(timr, flags); | |
1da177e4 LT |
408 | } |
409 | ||
ba661292 | 410 | int posix_timer_event(struct k_itimer *timr, int si_private) |
1da177e4 | 411 | { |
27af4245 ON |
412 | struct task_struct *task; |
413 | int shared, ret = -1; | |
ba661292 ON |
414 | /* |
415 | * FIXME: if ->sigq is queued we can race with | |
416 | * dequeue_signal()->do_schedule_next_timer(). | |
417 | * | |
418 | * If dequeue_signal() sees the "right" value of | |
419 | * si_sys_private it calls do_schedule_next_timer(). | |
420 | * We re-queue ->sigq and drop ->it_lock(). | |
421 | * do_schedule_next_timer() locks the timer | |
422 | * and re-schedules it while ->sigq is pending. | |
423 | * Not really bad, but not that we want. | |
424 | */ | |
1da177e4 | 425 | timr->sigq->info.si_sys_private = si_private; |
1da177e4 | 426 | |
27af4245 ON |
427 | rcu_read_lock(); |
428 | task = pid_task(timr->it_pid, PIDTYPE_PID); | |
429 | if (task) { | |
430 | shared = !(timr->it_sigev_notify & SIGEV_THREAD_ID); | |
431 | ret = send_sigqueue(timr->sigq, task, shared); | |
432 | } | |
433 | rcu_read_unlock(); | |
4aa73611 ON |
434 | /* If we failed to send the signal the timer stops. */ |
435 | return ret > 0; | |
1da177e4 LT |
436 | } |
437 | EXPORT_SYMBOL_GPL(posix_timer_event); | |
438 | ||
439 | /* | |
440 | * This function gets called when a POSIX.1b interval timer expires. It | |
441 | * is used as a callback from the kernel internal timer. The | |
442 | * run_timer_list code ALWAYS calls with interrupts on. | |
443 | ||
444 | * This code is for CLOCK_REALTIME* and CLOCK_MONOTONIC* timers. | |
445 | */ | |
c9cb2e3d | 446 | static enum hrtimer_restart posix_timer_fn(struct hrtimer *timer) |
1da177e4 | 447 | { |
05cfb614 | 448 | struct k_itimer *timr; |
1da177e4 | 449 | unsigned long flags; |
becf8b5d | 450 | int si_private = 0; |
c9cb2e3d | 451 | enum hrtimer_restart ret = HRTIMER_NORESTART; |
1da177e4 | 452 | |
05cfb614 | 453 | timr = container_of(timer, struct k_itimer, it.real.timer); |
1da177e4 | 454 | spin_lock_irqsave(&timr->it_lock, flags); |
1da177e4 | 455 | |
2456e855 | 456 | if (timr->it.real.interval != 0) |
becf8b5d | 457 | si_private = ++timr->it_requeue_pending; |
1da177e4 | 458 | |
becf8b5d TG |
459 | if (posix_timer_event(timr, si_private)) { |
460 | /* | |
461 | * signal was not sent because of sig_ignor | |
462 | * we will not get a call back to restart it AND | |
463 | * it should be restarted. | |
464 | */ | |
2456e855 | 465 | if (timr->it.real.interval != 0) { |
58229a18 TG |
466 | ktime_t now = hrtimer_cb_get_time(timer); |
467 | ||
468 | /* | |
469 | * FIXME: What we really want, is to stop this | |
470 | * timer completely and restart it in case the | |
471 | * SIG_IGN is removed. This is a non trivial | |
472 | * change which involves sighand locking | |
473 | * (sigh !), which we don't want to do late in | |
474 | * the release cycle. | |
475 | * | |
476 | * For now we just let timers with an interval | |
477 | * less than a jiffie expire every jiffie to | |
478 | * avoid softirq starvation in case of SIG_IGN | |
479 | * and a very small interval, which would put | |
480 | * the timer right back on the softirq pending | |
481 | * list. By moving now ahead of time we trick | |
482 | * hrtimer_forward() to expire the timer | |
483 | * later, while we still maintain the overrun | |
484 | * accuracy, but have some inconsistency in | |
485 | * the timer_gettime() case. This is at least | |
486 | * better than a starved softirq. A more | |
487 | * complex fix which solves also another related | |
488 | * inconsistency is already in the pipeline. | |
489 | */ | |
490 | #ifdef CONFIG_HIGH_RES_TIMERS | |
491 | { | |
8b0e1953 | 492 | ktime_t kj = NSEC_PER_SEC / HZ; |
58229a18 | 493 | |
2456e855 | 494 | if (timr->it.real.interval < kj) |
58229a18 TG |
495 | now = ktime_add(now, kj); |
496 | } | |
497 | #endif | |
4d672e7a | 498 | timr->it_overrun += (unsigned int) |
58229a18 | 499 | hrtimer_forward(timer, now, |
becf8b5d TG |
500 | timr->it.real.interval); |
501 | ret = HRTIMER_RESTART; | |
a0a0c28c | 502 | ++timr->it_requeue_pending; |
1da177e4 | 503 | } |
1da177e4 | 504 | } |
1da177e4 | 505 | |
becf8b5d TG |
506 | unlock_timer(timr, flags); |
507 | return ret; | |
508 | } | |
1da177e4 | 509 | |
27af4245 | 510 | static struct pid *good_sigevent(sigevent_t * event) |
1da177e4 LT |
511 | { |
512 | struct task_struct *rtn = current->group_leader; | |
513 | ||
514 | if ((event->sigev_notify & SIGEV_THREAD_ID ) && | |
8dc86af0 | 515 | (!(rtn = find_task_by_vpid(event->sigev_notify_thread_id)) || |
bac0abd6 | 516 | !same_thread_group(rtn, current) || |
1da177e4 LT |
517 | (event->sigev_notify & ~SIGEV_THREAD_ID) != SIGEV_SIGNAL)) |
518 | return NULL; | |
519 | ||
520 | if (((event->sigev_notify & ~SIGEV_THREAD_ID) != SIGEV_NONE) && | |
521 | ((event->sigev_signo <= 0) || (event->sigev_signo > SIGRTMAX))) | |
522 | return NULL; | |
523 | ||
27af4245 | 524 | return task_pid(rtn); |
1da177e4 LT |
525 | } |
526 | ||
52708737 TG |
527 | void posix_timers_register_clock(const clockid_t clock_id, |
528 | struct k_clock *new_clock) | |
1da177e4 LT |
529 | { |
530 | if ((unsigned) clock_id >= MAX_CLOCKS) { | |
4359ac0a TG |
531 | printk(KERN_WARNING "POSIX clock register failed for clock_id %d\n", |
532 | clock_id); | |
533 | return; | |
534 | } | |
535 | ||
536 | if (!new_clock->clock_get) { | |
537 | printk(KERN_WARNING "POSIX clock id %d lacks clock_get()\n", | |
538 | clock_id); | |
539 | return; | |
540 | } | |
541 | if (!new_clock->clock_getres) { | |
542 | printk(KERN_WARNING "POSIX clock id %d lacks clock_getres()\n", | |
1da177e4 LT |
543 | clock_id); |
544 | return; | |
545 | } | |
546 | ||
547 | posix_clocks[clock_id] = *new_clock; | |
548 | } | |
52708737 | 549 | EXPORT_SYMBOL_GPL(posix_timers_register_clock); |
1da177e4 LT |
550 | |
551 | static struct k_itimer * alloc_posix_timer(void) | |
552 | { | |
553 | struct k_itimer *tmr; | |
c3762229 | 554 | tmr = kmem_cache_zalloc(posix_timers_cache, GFP_KERNEL); |
1da177e4 LT |
555 | if (!tmr) |
556 | return tmr; | |
1da177e4 LT |
557 | if (unlikely(!(tmr->sigq = sigqueue_alloc()))) { |
558 | kmem_cache_free(posix_timers_cache, tmr); | |
aa94fbd5 | 559 | return NULL; |
1da177e4 | 560 | } |
ba661292 | 561 | memset(&tmr->sigq->info, 0, sizeof(siginfo_t)); |
1da177e4 LT |
562 | return tmr; |
563 | } | |
564 | ||
8af08871 ED |
565 | static void k_itimer_rcu_free(struct rcu_head *head) |
566 | { | |
567 | struct k_itimer *tmr = container_of(head, struct k_itimer, it.rcu); | |
568 | ||
569 | kmem_cache_free(posix_timers_cache, tmr); | |
570 | } | |
571 | ||
1da177e4 LT |
572 | #define IT_ID_SET 1 |
573 | #define IT_ID_NOT_SET 0 | |
574 | static void release_posix_timer(struct k_itimer *tmr, int it_id_set) | |
575 | { | |
576 | if (it_id_set) { | |
577 | unsigned long flags; | |
5ed67f05 PE |
578 | spin_lock_irqsave(&hash_lock, flags); |
579 | hlist_del_rcu(&tmr->t_hash); | |
580 | spin_unlock_irqrestore(&hash_lock, flags); | |
1da177e4 | 581 | } |
89992102 | 582 | put_pid(tmr->it_pid); |
1da177e4 | 583 | sigqueue_free(tmr->sigq); |
8af08871 | 584 | call_rcu(&tmr->it.rcu, k_itimer_rcu_free); |
1da177e4 LT |
585 | } |
586 | ||
cc785ac2 TG |
587 | static struct k_clock *clockid_to_kclock(const clockid_t id) |
588 | { | |
589 | if (id < 0) | |
0606f422 RC |
590 | return (id & CLOCKFD_MASK) == CLOCKFD ? |
591 | &clock_posix_dynamic : &clock_posix_cpu; | |
cc785ac2 TG |
592 | |
593 | if (id >= MAX_CLOCKS || !posix_clocks[id].clock_getres) | |
594 | return NULL; | |
595 | return &posix_clocks[id]; | |
596 | } | |
597 | ||
838394fb TG |
598 | static int common_timer_create(struct k_itimer *new_timer) |
599 | { | |
600 | hrtimer_init(&new_timer->it.real.timer, new_timer->it_clock, 0); | |
601 | return 0; | |
602 | } | |
603 | ||
1da177e4 LT |
604 | /* Create a POSIX.1b interval timer. */ |
605 | ||
362e9c07 HC |
606 | SYSCALL_DEFINE3(timer_create, const clockid_t, which_clock, |
607 | struct sigevent __user *, timer_event_spec, | |
608 | timer_t __user *, created_timer_id) | |
1da177e4 | 609 | { |
838394fb | 610 | struct k_clock *kc = clockid_to_kclock(which_clock); |
2cd499e3 | 611 | struct k_itimer *new_timer; |
ef864c95 | 612 | int error, new_timer_id; |
1da177e4 LT |
613 | sigevent_t event; |
614 | int it_id_set = IT_ID_NOT_SET; | |
615 | ||
838394fb | 616 | if (!kc) |
1da177e4 | 617 | return -EINVAL; |
838394fb TG |
618 | if (!kc->timer_create) |
619 | return -EOPNOTSUPP; | |
1da177e4 LT |
620 | |
621 | new_timer = alloc_posix_timer(); | |
622 | if (unlikely(!new_timer)) | |
623 | return -EAGAIN; | |
624 | ||
625 | spin_lock_init(&new_timer->it_lock); | |
5ed67f05 PE |
626 | new_timer_id = posix_timer_add(new_timer); |
627 | if (new_timer_id < 0) { | |
628 | error = new_timer_id; | |
1da177e4 LT |
629 | goto out; |
630 | } | |
631 | ||
632 | it_id_set = IT_ID_SET; | |
633 | new_timer->it_id = (timer_t) new_timer_id; | |
634 | new_timer->it_clock = which_clock; | |
635 | new_timer->it_overrun = -1; | |
1da177e4 | 636 | |
1da177e4 LT |
637 | if (timer_event_spec) { |
638 | if (copy_from_user(&event, timer_event_spec, sizeof (event))) { | |
639 | error = -EFAULT; | |
640 | goto out; | |
641 | } | |
36b2f046 | 642 | rcu_read_lock(); |
89992102 | 643 | new_timer->it_pid = get_pid(good_sigevent(&event)); |
36b2f046 | 644 | rcu_read_unlock(); |
89992102 | 645 | if (!new_timer->it_pid) { |
1da177e4 LT |
646 | error = -EINVAL; |
647 | goto out; | |
648 | } | |
649 | } else { | |
6891c450 | 650 | memset(&event.sigev_value, 0, sizeof(event.sigev_value)); |
5a9fa730 ON |
651 | event.sigev_notify = SIGEV_SIGNAL; |
652 | event.sigev_signo = SIGALRM; | |
653 | event.sigev_value.sival_int = new_timer->it_id; | |
89992102 | 654 | new_timer->it_pid = get_pid(task_tgid(current)); |
1da177e4 LT |
655 | } |
656 | ||
5a9fa730 ON |
657 | new_timer->it_sigev_notify = event.sigev_notify; |
658 | new_timer->sigq->info.si_signo = event.sigev_signo; | |
659 | new_timer->sigq->info.si_value = event.sigev_value; | |
717835d9 | 660 | new_timer->sigq->info.si_tid = new_timer->it_id; |
5a9fa730 | 661 | new_timer->sigq->info.si_code = SI_TIMER; |
717835d9 | 662 | |
2b08de00 AV |
663 | if (copy_to_user(created_timer_id, |
664 | &new_timer_id, sizeof (new_timer_id))) { | |
665 | error = -EFAULT; | |
666 | goto out; | |
667 | } | |
668 | ||
838394fb | 669 | error = kc->timer_create(new_timer); |
45e0fffc AV |
670 | if (error) |
671 | goto out; | |
672 | ||
36b2f046 | 673 | spin_lock_irq(¤t->sighand->siglock); |
27af4245 | 674 | new_timer->it_signal = current->signal; |
36b2f046 ON |
675 | list_add(&new_timer->list, ¤t->signal->posix_timers); |
676 | spin_unlock_irq(¤t->sighand->siglock); | |
ef864c95 ON |
677 | |
678 | return 0; | |
838394fb | 679 | /* |
1da177e4 LT |
680 | * In the case of the timer belonging to another task, after |
681 | * the task is unlocked, the timer is owned by the other task | |
682 | * and may cease to exist at any time. Don't use or modify | |
683 | * new_timer after the unlock call. | |
684 | */ | |
1da177e4 | 685 | out: |
ef864c95 | 686 | release_posix_timer(new_timer, it_id_set); |
1da177e4 LT |
687 | return error; |
688 | } | |
689 | ||
1da177e4 LT |
690 | /* |
691 | * Locking issues: We need to protect the result of the id look up until | |
692 | * we get the timer locked down so it is not deleted under us. The | |
693 | * removal is done under the idr spinlock so we use that here to bridge | |
694 | * the find to the timer lock. To avoid a dead lock, the timer id MUST | |
695 | * be release with out holding the timer lock. | |
696 | */ | |
20f33a03 | 697 | static struct k_itimer *__lock_timer(timer_t timer_id, unsigned long *flags) |
1da177e4 LT |
698 | { |
699 | struct k_itimer *timr; | |
8af08871 | 700 | |
e182bb38 TH |
701 | /* |
702 | * timer_t could be any type >= int and we want to make sure any | |
703 | * @timer_id outside positive int range fails lookup. | |
704 | */ | |
705 | if ((unsigned long long)timer_id > INT_MAX) | |
706 | return NULL; | |
707 | ||
8af08871 | 708 | rcu_read_lock(); |
5ed67f05 | 709 | timr = posix_timer_by_id(timer_id); |
1da177e4 | 710 | if (timr) { |
8af08871 | 711 | spin_lock_irqsave(&timr->it_lock, *flags); |
89992102 | 712 | if (timr->it_signal == current->signal) { |
8af08871 | 713 | rcu_read_unlock(); |
31d92845 ON |
714 | return timr; |
715 | } | |
8af08871 | 716 | spin_unlock_irqrestore(&timr->it_lock, *flags); |
31d92845 | 717 | } |
8af08871 | 718 | rcu_read_unlock(); |
1da177e4 | 719 | |
31d92845 | 720 | return NULL; |
1da177e4 LT |
721 | } |
722 | ||
723 | /* | |
724 | * Get the time remaining on a POSIX.1b interval timer. This function | |
725 | * is ALWAYS called with spin_lock_irq on the timer, thus it must not | |
726 | * mess with irq. | |
727 | * | |
728 | * We have a couple of messes to clean up here. First there is the case | |
729 | * of a timer that has a requeue pending. These timers should appear to | |
730 | * be in the timer list with an expiry as if we were to requeue them | |
731 | * now. | |
732 | * | |
733 | * The second issue is the SIGEV_NONE timer which may be active but is | |
734 | * not really ever put in the timer list (to save system resources). | |
735 | * This timer may be expired, and if so, we will do it here. Otherwise | |
736 | * it is the same as a requeue pending timer WRT to what we should | |
737 | * report. | |
738 | */ | |
739 | static void | |
740 | common_timer_get(struct k_itimer *timr, struct itimerspec *cur_setting) | |
741 | { | |
3b98a532 | 742 | ktime_t now, remaining, iv; |
becf8b5d | 743 | struct hrtimer *timer = &timr->it.real.timer; |
1da177e4 | 744 | |
becf8b5d | 745 | memset(cur_setting, 0, sizeof(struct itimerspec)); |
becf8b5d | 746 | |
3b98a532 RZ |
747 | iv = timr->it.real.interval; |
748 | ||
becf8b5d | 749 | /* interval timer ? */ |
2456e855 | 750 | if (iv) |
3b98a532 RZ |
751 | cur_setting->it_interval = ktime_to_timespec(iv); |
752 | else if (!hrtimer_active(timer) && | |
753 | (timr->it_sigev_notify & ~SIGEV_THREAD_ID) != SIGEV_NONE) | |
becf8b5d | 754 | return; |
3b98a532 RZ |
755 | |
756 | now = timer->base->get_time(); | |
757 | ||
becf8b5d | 758 | /* |
3b98a532 RZ |
759 | * When a requeue is pending or this is a SIGEV_NONE |
760 | * timer move the expiry time forward by intervals, so | |
761 | * expiry is > now. | |
becf8b5d | 762 | */ |
2456e855 TG |
763 | if (iv && (timr->it_requeue_pending & REQUEUE_PENDING || |
764 | (timr->it_sigev_notify & ~SIGEV_THREAD_ID) == SIGEV_NONE)) | |
4d672e7a | 765 | timr->it_overrun += (unsigned int) hrtimer_forward(timer, now, iv); |
3b98a532 | 766 | |
572c3917 | 767 | remaining = __hrtimer_expires_remaining_adjusted(timer, now); |
becf8b5d | 768 | /* Return 0 only, when the timer is expired and not pending */ |
2456e855 | 769 | if (remaining <= 0) { |
3b98a532 RZ |
770 | /* |
771 | * A single shot SIGEV_NONE timer must return 0, when | |
772 | * it is expired ! | |
773 | */ | |
774 | if ((timr->it_sigev_notify & ~SIGEV_THREAD_ID) != SIGEV_NONE) | |
775 | cur_setting->it_value.tv_nsec = 1; | |
776 | } else | |
becf8b5d | 777 | cur_setting->it_value = ktime_to_timespec(remaining); |
1da177e4 LT |
778 | } |
779 | ||
780 | /* Get the time remaining on a POSIX.1b interval timer. */ | |
362e9c07 HC |
781 | SYSCALL_DEFINE2(timer_gettime, timer_t, timer_id, |
782 | struct itimerspec __user *, setting) | |
1da177e4 | 783 | { |
1da177e4 | 784 | struct itimerspec cur_setting; |
a7319fa2 TG |
785 | struct k_itimer *timr; |
786 | struct k_clock *kc; | |
1da177e4 | 787 | unsigned long flags; |
a7319fa2 | 788 | int ret = 0; |
1da177e4 LT |
789 | |
790 | timr = lock_timer(timer_id, &flags); | |
791 | if (!timr) | |
792 | return -EINVAL; | |
793 | ||
a7319fa2 TG |
794 | kc = clockid_to_kclock(timr->it_clock); |
795 | if (WARN_ON_ONCE(!kc || !kc->timer_get)) | |
796 | ret = -EINVAL; | |
797 | else | |
798 | kc->timer_get(timr, &cur_setting); | |
1da177e4 LT |
799 | |
800 | unlock_timer(timr, flags); | |
801 | ||
a7319fa2 | 802 | if (!ret && copy_to_user(setting, &cur_setting, sizeof (cur_setting))) |
1da177e4 LT |
803 | return -EFAULT; |
804 | ||
a7319fa2 | 805 | return ret; |
1da177e4 | 806 | } |
becf8b5d | 807 | |
1da177e4 LT |
808 | /* |
809 | * Get the number of overruns of a POSIX.1b interval timer. This is to | |
810 | * be the overrun of the timer last delivered. At the same time we are | |
811 | * accumulating overruns on the next timer. The overrun is frozen when | |
812 | * the signal is delivered, either at the notify time (if the info block | |
813 | * is not queued) or at the actual delivery time (as we are informed by | |
814 | * the call back to do_schedule_next_timer(). So all we need to do is | |
815 | * to pick up the frozen overrun. | |
816 | */ | |
362e9c07 | 817 | SYSCALL_DEFINE1(timer_getoverrun, timer_t, timer_id) |
1da177e4 LT |
818 | { |
819 | struct k_itimer *timr; | |
820 | int overrun; | |
5ba25331 | 821 | unsigned long flags; |
1da177e4 LT |
822 | |
823 | timr = lock_timer(timer_id, &flags); | |
824 | if (!timr) | |
825 | return -EINVAL; | |
826 | ||
827 | overrun = timr->it_overrun_last; | |
828 | unlock_timer(timr, flags); | |
829 | ||
830 | return overrun; | |
831 | } | |
1da177e4 LT |
832 | |
833 | /* Set a POSIX.1b interval timer. */ | |
834 | /* timr->it_lock is taken. */ | |
858119e1 | 835 | static int |
1da177e4 LT |
836 | common_timer_set(struct k_itimer *timr, int flags, |
837 | struct itimerspec *new_setting, struct itimerspec *old_setting) | |
838 | { | |
becf8b5d | 839 | struct hrtimer *timer = &timr->it.real.timer; |
7978672c | 840 | enum hrtimer_mode mode; |
1da177e4 LT |
841 | |
842 | if (old_setting) | |
843 | common_timer_get(timr, old_setting); | |
844 | ||
845 | /* disable the timer */ | |
2456e855 | 846 | timr->it.real.interval = 0; |
1da177e4 LT |
847 | /* |
848 | * careful here. If smp we could be in the "fire" routine which will | |
849 | * be spinning as we hold the lock. But this is ONLY an SMP issue. | |
850 | */ | |
becf8b5d | 851 | if (hrtimer_try_to_cancel(timer) < 0) |
1da177e4 | 852 | return TIMER_RETRY; |
1da177e4 LT |
853 | |
854 | timr->it_requeue_pending = (timr->it_requeue_pending + 2) & | |
855 | ~REQUEUE_PENDING; | |
856 | timr->it_overrun_last = 0; | |
1da177e4 | 857 | |
becf8b5d TG |
858 | /* switch off the timer when it_value is zero */ |
859 | if (!new_setting->it_value.tv_sec && !new_setting->it_value.tv_nsec) | |
860 | return 0; | |
1da177e4 | 861 | |
c9cb2e3d | 862 | mode = flags & TIMER_ABSTIME ? HRTIMER_MODE_ABS : HRTIMER_MODE_REL; |
7978672c | 863 | hrtimer_init(&timr->it.real.timer, timr->it_clock, mode); |
7978672c | 864 | timr->it.real.timer.function = posix_timer_fn; |
becf8b5d | 865 | |
cc584b21 | 866 | hrtimer_set_expires(timer, timespec_to_ktime(new_setting->it_value)); |
becf8b5d TG |
867 | |
868 | /* Convert interval */ | |
869 | timr->it.real.interval = timespec_to_ktime(new_setting->it_interval); | |
870 | ||
871 | /* SIGEV_NONE timers are not queued ! See common_timer_get */ | |
952bbc87 TG |
872 | if (((timr->it_sigev_notify & ~SIGEV_THREAD_ID) == SIGEV_NONE)) { |
873 | /* Setup correct expiry time for relative timers */ | |
5a7780e7 | 874 | if (mode == HRTIMER_MODE_REL) { |
cc584b21 | 875 | hrtimer_add_expires(timer, timer->base->get_time()); |
5a7780e7 | 876 | } |
becf8b5d | 877 | return 0; |
952bbc87 | 878 | } |
becf8b5d | 879 | |
cc584b21 | 880 | hrtimer_start_expires(timer, mode); |
1da177e4 LT |
881 | return 0; |
882 | } | |
883 | ||
884 | /* Set a POSIX.1b interval timer */ | |
362e9c07 HC |
885 | SYSCALL_DEFINE4(timer_settime, timer_t, timer_id, int, flags, |
886 | const struct itimerspec __user *, new_setting, | |
887 | struct itimerspec __user *, old_setting) | |
1da177e4 LT |
888 | { |
889 | struct k_itimer *timr; | |
890 | struct itimerspec new_spec, old_spec; | |
891 | int error = 0; | |
5ba25331 | 892 | unsigned long flag; |
1da177e4 | 893 | struct itimerspec *rtn = old_setting ? &old_spec : NULL; |
27722df1 | 894 | struct k_clock *kc; |
1da177e4 LT |
895 | |
896 | if (!new_setting) | |
897 | return -EINVAL; | |
898 | ||
899 | if (copy_from_user(&new_spec, new_setting, sizeof (new_spec))) | |
900 | return -EFAULT; | |
901 | ||
becf8b5d TG |
902 | if (!timespec_valid(&new_spec.it_interval) || |
903 | !timespec_valid(&new_spec.it_value)) | |
1da177e4 LT |
904 | return -EINVAL; |
905 | retry: | |
906 | timr = lock_timer(timer_id, &flag); | |
907 | if (!timr) | |
908 | return -EINVAL; | |
909 | ||
27722df1 TG |
910 | kc = clockid_to_kclock(timr->it_clock); |
911 | if (WARN_ON_ONCE(!kc || !kc->timer_set)) | |
912 | error = -EINVAL; | |
913 | else | |
914 | error = kc->timer_set(timr, flags, &new_spec, rtn); | |
1da177e4 LT |
915 | |
916 | unlock_timer(timr, flag); | |
917 | if (error == TIMER_RETRY) { | |
918 | rtn = NULL; // We already got the old time... | |
919 | goto retry; | |
920 | } | |
921 | ||
becf8b5d TG |
922 | if (old_setting && !error && |
923 | copy_to_user(old_setting, &old_spec, sizeof (old_spec))) | |
1da177e4 LT |
924 | error = -EFAULT; |
925 | ||
926 | return error; | |
927 | } | |
928 | ||
6761c670 | 929 | static int common_timer_del(struct k_itimer *timer) |
1da177e4 | 930 | { |
2456e855 | 931 | timer->it.real.interval = 0; |
f972be33 | 932 | |
becf8b5d | 933 | if (hrtimer_try_to_cancel(&timer->it.real.timer) < 0) |
1da177e4 | 934 | return TIMER_RETRY; |
1da177e4 LT |
935 | return 0; |
936 | } | |
937 | ||
938 | static inline int timer_delete_hook(struct k_itimer *timer) | |
939 | { | |
6761c670 TG |
940 | struct k_clock *kc = clockid_to_kclock(timer->it_clock); |
941 | ||
942 | if (WARN_ON_ONCE(!kc || !kc->timer_del)) | |
943 | return -EINVAL; | |
944 | return kc->timer_del(timer); | |
1da177e4 LT |
945 | } |
946 | ||
947 | /* Delete a POSIX.1b interval timer. */ | |
362e9c07 | 948 | SYSCALL_DEFINE1(timer_delete, timer_t, timer_id) |
1da177e4 LT |
949 | { |
950 | struct k_itimer *timer; | |
5ba25331 | 951 | unsigned long flags; |
1da177e4 | 952 | |
1da177e4 | 953 | retry_delete: |
1da177e4 LT |
954 | timer = lock_timer(timer_id, &flags); |
955 | if (!timer) | |
956 | return -EINVAL; | |
957 | ||
becf8b5d | 958 | if (timer_delete_hook(timer) == TIMER_RETRY) { |
1da177e4 LT |
959 | unlock_timer(timer, flags); |
960 | goto retry_delete; | |
961 | } | |
becf8b5d | 962 | |
1da177e4 LT |
963 | spin_lock(¤t->sighand->siglock); |
964 | list_del(&timer->list); | |
965 | spin_unlock(¤t->sighand->siglock); | |
966 | /* | |
967 | * This keeps any tasks waiting on the spin lock from thinking | |
968 | * they got something (see the lock code above). | |
969 | */ | |
89992102 | 970 | timer->it_signal = NULL; |
4b7a1304 | 971 | |
1da177e4 LT |
972 | unlock_timer(timer, flags); |
973 | release_posix_timer(timer, IT_ID_SET); | |
974 | return 0; | |
975 | } | |
becf8b5d | 976 | |
1da177e4 LT |
977 | /* |
978 | * return timer owned by the process, used by exit_itimers | |
979 | */ | |
858119e1 | 980 | static void itimer_delete(struct k_itimer *timer) |
1da177e4 LT |
981 | { |
982 | unsigned long flags; | |
983 | ||
1da177e4 | 984 | retry_delete: |
1da177e4 LT |
985 | spin_lock_irqsave(&timer->it_lock, flags); |
986 | ||
becf8b5d | 987 | if (timer_delete_hook(timer) == TIMER_RETRY) { |
1da177e4 LT |
988 | unlock_timer(timer, flags); |
989 | goto retry_delete; | |
990 | } | |
1da177e4 LT |
991 | list_del(&timer->list); |
992 | /* | |
993 | * This keeps any tasks waiting on the spin lock from thinking | |
994 | * they got something (see the lock code above). | |
995 | */ | |
89992102 | 996 | timer->it_signal = NULL; |
4b7a1304 | 997 | |
1da177e4 LT |
998 | unlock_timer(timer, flags); |
999 | release_posix_timer(timer, IT_ID_SET); | |
1000 | } | |
1001 | ||
1002 | /* | |
25f407f0 | 1003 | * This is called by do_exit or de_thread, only when there are no more |
1da177e4 LT |
1004 | * references to the shared signal_struct. |
1005 | */ | |
1006 | void exit_itimers(struct signal_struct *sig) | |
1007 | { | |
1008 | struct k_itimer *tmr; | |
1009 | ||
1010 | while (!list_empty(&sig->posix_timers)) { | |
1011 | tmr = list_entry(sig->posix_timers.next, struct k_itimer, list); | |
1012 | itimer_delete(tmr); | |
1013 | } | |
1014 | } | |
1015 | ||
362e9c07 HC |
1016 | SYSCALL_DEFINE2(clock_settime, const clockid_t, which_clock, |
1017 | const struct timespec __user *, tp) | |
1da177e4 | 1018 | { |
26f9a479 | 1019 | struct k_clock *kc = clockid_to_kclock(which_clock); |
1da177e4 LT |
1020 | struct timespec new_tp; |
1021 | ||
26f9a479 | 1022 | if (!kc || !kc->clock_set) |
1da177e4 | 1023 | return -EINVAL; |
26f9a479 | 1024 | |
1da177e4 LT |
1025 | if (copy_from_user(&new_tp, tp, sizeof (*tp))) |
1026 | return -EFAULT; | |
1027 | ||
26f9a479 | 1028 | return kc->clock_set(which_clock, &new_tp); |
1da177e4 LT |
1029 | } |
1030 | ||
362e9c07 HC |
1031 | SYSCALL_DEFINE2(clock_gettime, const clockid_t, which_clock, |
1032 | struct timespec __user *,tp) | |
1da177e4 | 1033 | { |
42285777 | 1034 | struct k_clock *kc = clockid_to_kclock(which_clock); |
1da177e4 LT |
1035 | struct timespec kernel_tp; |
1036 | int error; | |
1037 | ||
42285777 | 1038 | if (!kc) |
1da177e4 | 1039 | return -EINVAL; |
42285777 TG |
1040 | |
1041 | error = kc->clock_get(which_clock, &kernel_tp); | |
1042 | ||
1da177e4 LT |
1043 | if (!error && copy_to_user(tp, &kernel_tp, sizeof (kernel_tp))) |
1044 | error = -EFAULT; | |
1045 | ||
1046 | return error; | |
1da177e4 LT |
1047 | } |
1048 | ||
f1f1d5eb RC |
1049 | SYSCALL_DEFINE2(clock_adjtime, const clockid_t, which_clock, |
1050 | struct timex __user *, utx) | |
1051 | { | |
1052 | struct k_clock *kc = clockid_to_kclock(which_clock); | |
1053 | struct timex ktx; | |
1054 | int err; | |
1055 | ||
1056 | if (!kc) | |
1057 | return -EINVAL; | |
1058 | if (!kc->clock_adj) | |
1059 | return -EOPNOTSUPP; | |
1060 | ||
1061 | if (copy_from_user(&ktx, utx, sizeof(ktx))) | |
1062 | return -EFAULT; | |
1063 | ||
1064 | err = kc->clock_adj(which_clock, &ktx); | |
1065 | ||
f0dbe81f | 1066 | if (err >= 0 && copy_to_user(utx, &ktx, sizeof(ktx))) |
f1f1d5eb RC |
1067 | return -EFAULT; |
1068 | ||
1069 | return err; | |
1070 | } | |
1071 | ||
362e9c07 HC |
1072 | SYSCALL_DEFINE2(clock_getres, const clockid_t, which_clock, |
1073 | struct timespec __user *, tp) | |
1da177e4 | 1074 | { |
e5e542ee | 1075 | struct k_clock *kc = clockid_to_kclock(which_clock); |
1da177e4 LT |
1076 | struct timespec rtn_tp; |
1077 | int error; | |
1078 | ||
e5e542ee | 1079 | if (!kc) |
1da177e4 LT |
1080 | return -EINVAL; |
1081 | ||
e5e542ee | 1082 | error = kc->clock_getres(which_clock, &rtn_tp); |
1da177e4 | 1083 | |
e5e542ee | 1084 | if (!error && tp && copy_to_user(tp, &rtn_tp, sizeof (rtn_tp))) |
1da177e4 | 1085 | error = -EFAULT; |
1da177e4 LT |
1086 | |
1087 | return error; | |
1088 | } | |
1089 | ||
97735f25 TG |
1090 | /* |
1091 | * nanosleep for monotonic and realtime clocks | |
1092 | */ | |
1093 | static int common_nsleep(const clockid_t which_clock, int flags, | |
1094 | struct timespec *tsave, struct timespec __user *rmtp) | |
1095 | { | |
080344b9 ON |
1096 | return hrtimer_nanosleep(tsave, rmtp, flags & TIMER_ABSTIME ? |
1097 | HRTIMER_MODE_ABS : HRTIMER_MODE_REL, | |
1098 | which_clock); | |
97735f25 | 1099 | } |
1da177e4 | 1100 | |
362e9c07 HC |
1101 | SYSCALL_DEFINE4(clock_nanosleep, const clockid_t, which_clock, int, flags, |
1102 | const struct timespec __user *, rqtp, | |
1103 | struct timespec __user *, rmtp) | |
1da177e4 | 1104 | { |
a5cd2880 | 1105 | struct k_clock *kc = clockid_to_kclock(which_clock); |
1da177e4 | 1106 | struct timespec t; |
1da177e4 | 1107 | |
a5cd2880 | 1108 | if (!kc) |
1da177e4 | 1109 | return -EINVAL; |
a5cd2880 TG |
1110 | if (!kc->nsleep) |
1111 | return -ENANOSLEEP_NOTSUP; | |
1da177e4 LT |
1112 | |
1113 | if (copy_from_user(&t, rqtp, sizeof (struct timespec))) | |
1114 | return -EFAULT; | |
1115 | ||
5f82b2b7 | 1116 | if (!timespec_valid(&t)) |
1da177e4 LT |
1117 | return -EINVAL; |
1118 | ||
a5cd2880 | 1119 | return kc->nsleep(which_clock, flags, &t, rmtp); |
1da177e4 | 1120 | } |
1711ef38 | 1121 | |
1711ef38 TA |
1122 | /* |
1123 | * This will restart clock_nanosleep. This is required only by | |
1124 | * compat_clock_nanosleep_restart for now. | |
1125 | */ | |
59bd5bc2 | 1126 | long clock_nanosleep_restart(struct restart_block *restart_block) |
1711ef38 | 1127 | { |
ab8177bc | 1128 | clockid_t which_clock = restart_block->nanosleep.clockid; |
59bd5bc2 TG |
1129 | struct k_clock *kc = clockid_to_kclock(which_clock); |
1130 | ||
1131 | if (WARN_ON_ONCE(!kc || !kc->nsleep_restart)) | |
1132 | return -EINVAL; | |
1711ef38 | 1133 | |
59bd5bc2 | 1134 | return kc->nsleep_restart(restart_block); |
1711ef38 | 1135 | } |