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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> |
edbeda46 | 52 | #include <linux/compat.h> |
19b558db | 53 | #include <linux/nospec.h> |
1da177e4 | 54 | |
8b094cd0 | 55 | #include "timekeeping.h" |
bab0aae9 | 56 | #include "posix-timers.h" |
8b094cd0 | 57 | |
1da177e4 | 58 | /* |
5ed67f05 PE |
59 | * Management arrays for POSIX timers. Timers are now kept in static hash table |
60 | * with 512 entries. | |
61 | * Timer ids are allocated by local routine, which selects proper hash head by | |
62 | * key, constructed from current->signal address and per signal struct counter. | |
63 | * This keeps timer ids unique per process, but now they can intersect between | |
64 | * processes. | |
1da177e4 LT |
65 | */ |
66 | ||
67 | /* | |
68 | * Lets keep our timers in a slab cache :-) | |
69 | */ | |
e18b890b | 70 | static struct kmem_cache *posix_timers_cache; |
5ed67f05 PE |
71 | |
72 | static DEFINE_HASHTABLE(posix_timers_hashtable, 9); | |
73 | static DEFINE_SPINLOCK(hash_lock); | |
1da177e4 | 74 | |
6631fa12 TG |
75 | static const struct k_clock * const posix_clocks[]; |
76 | static const struct k_clock *clockid_to_kclock(const clockid_t id); | |
67edab48 | 77 | static const struct k_clock clock_realtime, clock_monotonic; |
6631fa12 | 78 | |
1da177e4 LT |
79 | /* |
80 | * we assume that the new SIGEV_THREAD_ID shares no bits with the other | |
81 | * SIGEV values. Here we put out an error if this assumption fails. | |
82 | */ | |
83 | #if SIGEV_THREAD_ID != (SIGEV_THREAD_ID & \ | |
84 | ~(SIGEV_SIGNAL | SIGEV_NONE | SIGEV_THREAD)) | |
85 | #error "SIGEV_THREAD_ID must not share bit with other SIGEV values!" | |
86 | #endif | |
87 | ||
65da528d TG |
88 | /* |
89 | * parisc wants ENOTSUP instead of EOPNOTSUPP | |
90 | */ | |
91 | #ifndef ENOTSUP | |
92 | # define ENANOSLEEP_NOTSUP EOPNOTSUPP | |
93 | #else | |
94 | # define ENANOSLEEP_NOTSUP ENOTSUP | |
95 | #endif | |
1da177e4 LT |
96 | |
97 | /* | |
98 | * The timer ID is turned into a timer address by idr_find(). | |
99 | * Verifying a valid ID consists of: | |
100 | * | |
101 | * a) checking that idr_find() returns other than -1. | |
102 | * b) checking that the timer id matches the one in the timer itself. | |
103 | * c) that the timer owner is in the callers thread group. | |
104 | */ | |
105 | ||
106 | /* | |
107 | * CLOCKs: The POSIX standard calls for a couple of clocks and allows us | |
108 | * to implement others. This structure defines the various | |
0061748d | 109 | * clocks. |
1da177e4 LT |
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 | * | |
0061748d RC |
119 | * FUNCTIONS: The CLOCKs structure defines possible functions to |
120 | * handle various clock functions. | |
1da177e4 | 121 | * |
0061748d RC |
122 | * The standard POSIX timer management code assumes the |
123 | * following: 1.) The k_itimer struct (sched.h) is used for | |
124 | * the timer. 2.) The list, it_lock, it_clock, it_id and | |
125 | * it_pid fields are not modified by timer code. | |
1da177e4 LT |
126 | * |
127 | * Permissions: It is assumed that the clock_settime() function defined | |
128 | * for each clock will take care of permission checks. Some | |
129 | * clocks may be set able by any user (i.e. local process | |
130 | * clocks) others not. Currently the only set able clock we | |
131 | * have is CLOCK_REALTIME and its high res counter part, both of | |
132 | * which we beg off on and pass to do_sys_settimeofday(). | |
133 | */ | |
20f33a03 NK |
134 | static struct k_itimer *__lock_timer(timer_t timer_id, unsigned long *flags); |
135 | ||
136 | #define lock_timer(tid, flags) \ | |
137 | ({ struct k_itimer *__timr; \ | |
138 | __cond_lock(&__timr->it_lock, __timr = __lock_timer(tid, flags)); \ | |
139 | __timr; \ | |
140 | }) | |
1da177e4 | 141 | |
5ed67f05 PE |
142 | static int hash(struct signal_struct *sig, unsigned int nr) |
143 | { | |
144 | return hash_32(hash32_ptr(sig) ^ nr, HASH_BITS(posix_timers_hashtable)); | |
145 | } | |
146 | ||
147 | static struct k_itimer *__posix_timers_find(struct hlist_head *head, | |
148 | struct signal_struct *sig, | |
149 | timer_t id) | |
150 | { | |
5ed67f05 PE |
151 | struct k_itimer *timer; |
152 | ||
153 | hlist_for_each_entry_rcu(timer, head, t_hash) { | |
154 | if ((timer->it_signal == sig) && (timer->it_id == id)) | |
155 | return timer; | |
156 | } | |
157 | return NULL; | |
158 | } | |
159 | ||
160 | static struct k_itimer *posix_timer_by_id(timer_t id) | |
161 | { | |
162 | struct signal_struct *sig = current->signal; | |
163 | struct hlist_head *head = &posix_timers_hashtable[hash(sig, id)]; | |
164 | ||
165 | return __posix_timers_find(head, sig, id); | |
166 | } | |
167 | ||
168 | static int posix_timer_add(struct k_itimer *timer) | |
169 | { | |
170 | struct signal_struct *sig = current->signal; | |
171 | int first_free_id = sig->posix_timer_id; | |
172 | struct hlist_head *head; | |
173 | int ret = -ENOENT; | |
174 | ||
175 | do { | |
176 | spin_lock(&hash_lock); | |
177 | head = &posix_timers_hashtable[hash(sig, sig->posix_timer_id)]; | |
178 | if (!__posix_timers_find(head, sig, sig->posix_timer_id)) { | |
179 | hlist_add_head_rcu(&timer->t_hash, head); | |
180 | ret = sig->posix_timer_id; | |
181 | } | |
182 | if (++sig->posix_timer_id < 0) | |
183 | sig->posix_timer_id = 0; | |
184 | if ((sig->posix_timer_id == first_free_id) && (ret == -ENOENT)) | |
185 | /* Loop over all possible ids completed */ | |
186 | ret = -EAGAIN; | |
187 | spin_unlock(&hash_lock); | |
188 | } while (ret == -ENOENT); | |
189 | return ret; | |
190 | } | |
191 | ||
1da177e4 LT |
192 | static inline void unlock_timer(struct k_itimer *timr, unsigned long flags) |
193 | { | |
194 | spin_unlock_irqrestore(&timr->it_lock, flags); | |
195 | } | |
196 | ||
42285777 | 197 | /* Get clock_realtime */ |
3c9c12f4 | 198 | static int posix_clock_realtime_get(clockid_t which_clock, struct timespec64 *tp) |
42285777 | 199 | { |
3c9c12f4 | 200 | ktime_get_real_ts64(tp); |
42285777 TG |
201 | return 0; |
202 | } | |
203 | ||
26f9a479 TG |
204 | /* Set clock_realtime */ |
205 | static int posix_clock_realtime_set(const clockid_t which_clock, | |
0fe6afe3 | 206 | const struct timespec64 *tp) |
26f9a479 | 207 | { |
0fe6afe3 | 208 | return do_sys_settimeofday64(tp, NULL); |
26f9a479 TG |
209 | } |
210 | ||
f1f1d5eb RC |
211 | static int posix_clock_realtime_adj(const clockid_t which_clock, |
212 | struct timex *t) | |
213 | { | |
214 | return do_adjtimex(t); | |
215 | } | |
216 | ||
becf8b5d TG |
217 | /* |
218 | * Get monotonic time for posix timers | |
219 | */ | |
3c9c12f4 | 220 | static int posix_ktime_get_ts(clockid_t which_clock, struct timespec64 *tp) |
becf8b5d | 221 | { |
3c9c12f4 | 222 | ktime_get_ts64(tp); |
becf8b5d TG |
223 | return 0; |
224 | } | |
1da177e4 | 225 | |
2d42244a | 226 | /* |
7fdd7f89 | 227 | * Get monotonic-raw time for posix timers |
2d42244a | 228 | */ |
3c9c12f4 | 229 | static int posix_get_monotonic_raw(clockid_t which_clock, struct timespec64 *tp) |
2d42244a | 230 | { |
58a10456 | 231 | ktime_get_raw_ts64(tp); |
2d42244a JS |
232 | return 0; |
233 | } | |
234 | ||
da15cfda | 235 | |
3c9c12f4 | 236 | static int posix_get_realtime_coarse(clockid_t which_clock, struct timespec64 *tp) |
da15cfda | 237 | { |
58a10456 | 238 | ktime_get_coarse_real_ts64(tp); |
da15cfda JS |
239 | return 0; |
240 | } | |
241 | ||
242 | static int posix_get_monotonic_coarse(clockid_t which_clock, | |
3c9c12f4 | 243 | struct timespec64 *tp) |
da15cfda | 244 | { |
58a10456 | 245 | ktime_get_coarse_ts64(tp); |
da15cfda JS |
246 | return 0; |
247 | } | |
248 | ||
d2e3e0ca | 249 | static int posix_get_coarse_res(const clockid_t which_clock, struct timespec64 *tp) |
da15cfda | 250 | { |
d2e3e0ca | 251 | *tp = ktime_to_timespec64(KTIME_LOW_RES); |
da15cfda JS |
252 | return 0; |
253 | } | |
7fdd7f89 | 254 | |
a3ed0e43 | 255 | static int posix_get_boottime(const clockid_t which_clock, struct timespec64 *tp) |
7fdd7f89 | 256 | { |
58a10456 | 257 | ktime_get_boottime_ts64(tp); |
7fdd7f89 JS |
258 | return 0; |
259 | } | |
260 | ||
a3ed0e43 | 261 | static int posix_get_tai(clockid_t which_clock, struct timespec64 *tp) |
1ff3c967 | 262 | { |
58a10456 | 263 | ktime_get_clocktai_ts64(tp); |
1ff3c967 JS |
264 | return 0; |
265 | } | |
7fdd7f89 | 266 | |
d2e3e0ca | 267 | static int posix_get_hrtimer_res(clockid_t which_clock, struct timespec64 *tp) |
056a3cac TG |
268 | { |
269 | tp->tv_sec = 0; | |
270 | tp->tv_nsec = hrtimer_resolution; | |
271 | return 0; | |
272 | } | |
273 | ||
1da177e4 LT |
274 | /* |
275 | * Initialize everything, well, just everything in Posix clocks/timers ;) | |
276 | */ | |
277 | static __init int init_posix_timers(void) | |
278 | { | |
1da177e4 | 279 | posix_timers_cache = kmem_cache_create("posix_timers_cache", |
040b5c6f AD |
280 | sizeof (struct k_itimer), 0, SLAB_PANIC, |
281 | NULL); | |
1da177e4 LT |
282 | return 0; |
283 | } | |
1da177e4 LT |
284 | __initcall(init_posix_timers); |
285 | ||
f37fb0aa | 286 | static void common_hrtimer_rearm(struct k_itimer *timr) |
1da177e4 | 287 | { |
44f21475 RZ |
288 | struct hrtimer *timer = &timr->it.real.timer; |
289 | ||
80105cd0 | 290 | if (!timr->it_interval) |
1da177e4 LT |
291 | return; |
292 | ||
4d672e7a DL |
293 | timr->it_overrun += (unsigned int) hrtimer_forward(timer, |
294 | timer->base->get_time(), | |
80105cd0 | 295 | timr->it_interval); |
44f21475 | 296 | hrtimer_restart(timer); |
1da177e4 LT |
297 | } |
298 | ||
299 | /* | |
300 | * This function is exported for use by the signal deliver code. It is | |
301 | * called just prior to the info block being released and passes that | |
302 | * block to us. It's function is to update the overrun entry AND to | |
303 | * restart the timer. It should only be called if the timer is to be | |
304 | * restarted (i.e. we have flagged this in the sys_private entry of the | |
305 | * info block). | |
306 | * | |
25985edc | 307 | * To protect against the timer going away while the interrupt is queued, |
1da177e4 LT |
308 | * we require that the it_requeue_pending flag be set. |
309 | */ | |
96fe3b07 | 310 | void posixtimer_rearm(struct siginfo *info) |
1da177e4 LT |
311 | { |
312 | struct k_itimer *timr; | |
313 | unsigned long flags; | |
314 | ||
315 | timr = lock_timer(info->si_tid, &flags); | |
af888d67 TG |
316 | if (!timr) |
317 | return; | |
1da177e4 | 318 | |
af888d67 | 319 | if (timr->it_requeue_pending == info->si_sys_private) { |
f37fb0aa | 320 | timr->kclock->timer_rearm(timr); |
1da177e4 | 321 | |
21e55c1f | 322 | timr->it_active = 1; |
af888d67 TG |
323 | timr->it_overrun_last = timr->it_overrun; |
324 | timr->it_overrun = -1; | |
325 | ++timr->it_requeue_pending; | |
326 | ||
54da1174 | 327 | info->si_overrun += timr->it_overrun_last; |
becf8b5d TG |
328 | } |
329 | ||
af888d67 | 330 | unlock_timer(timr, flags); |
1da177e4 LT |
331 | } |
332 | ||
ba661292 | 333 | int posix_timer_event(struct k_itimer *timr, int si_private) |
1da177e4 | 334 | { |
27af4245 ON |
335 | struct task_struct *task; |
336 | int shared, ret = -1; | |
ba661292 ON |
337 | /* |
338 | * FIXME: if ->sigq is queued we can race with | |
96fe3b07 | 339 | * dequeue_signal()->posixtimer_rearm(). |
ba661292 ON |
340 | * |
341 | * If dequeue_signal() sees the "right" value of | |
96fe3b07 | 342 | * si_sys_private it calls posixtimer_rearm(). |
ba661292 | 343 | * We re-queue ->sigq and drop ->it_lock(). |
96fe3b07 | 344 | * posixtimer_rearm() locks the timer |
ba661292 ON |
345 | * and re-schedules it while ->sigq is pending. |
346 | * Not really bad, but not that we want. | |
347 | */ | |
1da177e4 | 348 | timr->sigq->info.si_sys_private = si_private; |
1da177e4 | 349 | |
27af4245 ON |
350 | rcu_read_lock(); |
351 | task = pid_task(timr->it_pid, PIDTYPE_PID); | |
352 | if (task) { | |
353 | shared = !(timr->it_sigev_notify & SIGEV_THREAD_ID); | |
354 | ret = send_sigqueue(timr->sigq, task, shared); | |
355 | } | |
356 | rcu_read_unlock(); | |
4aa73611 ON |
357 | /* If we failed to send the signal the timer stops. */ |
358 | return ret > 0; | |
1da177e4 | 359 | } |
1da177e4 LT |
360 | |
361 | /* | |
362 | * This function gets called when a POSIX.1b interval timer expires. It | |
363 | * is used as a callback from the kernel internal timer. The | |
364 | * run_timer_list code ALWAYS calls with interrupts on. | |
365 | ||
366 | * This code is for CLOCK_REALTIME* and CLOCK_MONOTONIC* timers. | |
367 | */ | |
c9cb2e3d | 368 | static enum hrtimer_restart posix_timer_fn(struct hrtimer *timer) |
1da177e4 | 369 | { |
05cfb614 | 370 | struct k_itimer *timr; |
1da177e4 | 371 | unsigned long flags; |
becf8b5d | 372 | int si_private = 0; |
c9cb2e3d | 373 | enum hrtimer_restart ret = HRTIMER_NORESTART; |
1da177e4 | 374 | |
05cfb614 | 375 | timr = container_of(timer, struct k_itimer, it.real.timer); |
1da177e4 | 376 | spin_lock_irqsave(&timr->it_lock, flags); |
1da177e4 | 377 | |
21e55c1f | 378 | timr->it_active = 0; |
80105cd0 | 379 | if (timr->it_interval != 0) |
becf8b5d | 380 | si_private = ++timr->it_requeue_pending; |
1da177e4 | 381 | |
becf8b5d TG |
382 | if (posix_timer_event(timr, si_private)) { |
383 | /* | |
384 | * signal was not sent because of sig_ignor | |
385 | * we will not get a call back to restart it AND | |
386 | * it should be restarted. | |
387 | */ | |
80105cd0 | 388 | if (timr->it_interval != 0) { |
58229a18 TG |
389 | ktime_t now = hrtimer_cb_get_time(timer); |
390 | ||
391 | /* | |
392 | * FIXME: What we really want, is to stop this | |
393 | * timer completely and restart it in case the | |
394 | * SIG_IGN is removed. This is a non trivial | |
395 | * change which involves sighand locking | |
396 | * (sigh !), which we don't want to do late in | |
397 | * the release cycle. | |
398 | * | |
399 | * For now we just let timers with an interval | |
400 | * less than a jiffie expire every jiffie to | |
401 | * avoid softirq starvation in case of SIG_IGN | |
402 | * and a very small interval, which would put | |
403 | * the timer right back on the softirq pending | |
404 | * list. By moving now ahead of time we trick | |
405 | * hrtimer_forward() to expire the timer | |
406 | * later, while we still maintain the overrun | |
407 | * accuracy, but have some inconsistency in | |
408 | * the timer_gettime() case. This is at least | |
409 | * better than a starved softirq. A more | |
410 | * complex fix which solves also another related | |
411 | * inconsistency is already in the pipeline. | |
412 | */ | |
413 | #ifdef CONFIG_HIGH_RES_TIMERS | |
414 | { | |
8b0e1953 | 415 | ktime_t kj = NSEC_PER_SEC / HZ; |
58229a18 | 416 | |
80105cd0 | 417 | if (timr->it_interval < kj) |
58229a18 TG |
418 | now = ktime_add(now, kj); |
419 | } | |
420 | #endif | |
4d672e7a | 421 | timr->it_overrun += (unsigned int) |
58229a18 | 422 | hrtimer_forward(timer, now, |
80105cd0 | 423 | timr->it_interval); |
becf8b5d | 424 | ret = HRTIMER_RESTART; |
a0a0c28c | 425 | ++timr->it_requeue_pending; |
21e55c1f | 426 | timr->it_active = 1; |
1da177e4 | 427 | } |
1da177e4 | 428 | } |
1da177e4 | 429 | |
becf8b5d TG |
430 | unlock_timer(timr, flags); |
431 | return ret; | |
432 | } | |
1da177e4 | 433 | |
27af4245 | 434 | static struct pid *good_sigevent(sigevent_t * event) |
1da177e4 LT |
435 | { |
436 | struct task_struct *rtn = current->group_leader; | |
437 | ||
cef31d9a TG |
438 | switch (event->sigev_notify) { |
439 | case SIGEV_SIGNAL | SIGEV_THREAD_ID: | |
440 | rtn = find_task_by_vpid(event->sigev_notify_thread_id); | |
441 | if (!rtn || !same_thread_group(rtn, current)) | |
442 | return NULL; | |
443 | /* FALLTHRU */ | |
444 | case SIGEV_SIGNAL: | |
445 | case SIGEV_THREAD: | |
446 | if (event->sigev_signo <= 0 || event->sigev_signo > SIGRTMAX) | |
447 | return NULL; | |
448 | /* FALLTHRU */ | |
449 | case SIGEV_NONE: | |
450 | return task_pid(rtn); | |
451 | default: | |
1da177e4 | 452 | return NULL; |
cef31d9a | 453 | } |
1da177e4 LT |
454 | } |
455 | ||
1da177e4 LT |
456 | static struct k_itimer * alloc_posix_timer(void) |
457 | { | |
458 | struct k_itimer *tmr; | |
c3762229 | 459 | tmr = kmem_cache_zalloc(posix_timers_cache, GFP_KERNEL); |
1da177e4 LT |
460 | if (!tmr) |
461 | return tmr; | |
1da177e4 LT |
462 | if (unlikely(!(tmr->sigq = sigqueue_alloc()))) { |
463 | kmem_cache_free(posix_timers_cache, tmr); | |
aa94fbd5 | 464 | return NULL; |
1da177e4 | 465 | } |
3b10db2b | 466 | clear_siginfo(&tmr->sigq->info); |
1da177e4 LT |
467 | return tmr; |
468 | } | |
469 | ||
8af08871 ED |
470 | static void k_itimer_rcu_free(struct rcu_head *head) |
471 | { | |
472 | struct k_itimer *tmr = container_of(head, struct k_itimer, it.rcu); | |
473 | ||
474 | kmem_cache_free(posix_timers_cache, tmr); | |
475 | } | |
476 | ||
1da177e4 LT |
477 | #define IT_ID_SET 1 |
478 | #define IT_ID_NOT_SET 0 | |
479 | static void release_posix_timer(struct k_itimer *tmr, int it_id_set) | |
480 | { | |
481 | if (it_id_set) { | |
482 | unsigned long flags; | |
5ed67f05 PE |
483 | spin_lock_irqsave(&hash_lock, flags); |
484 | hlist_del_rcu(&tmr->t_hash); | |
485 | spin_unlock_irqrestore(&hash_lock, flags); | |
1da177e4 | 486 | } |
89992102 | 487 | put_pid(tmr->it_pid); |
1da177e4 | 488 | sigqueue_free(tmr->sigq); |
8af08871 | 489 | call_rcu(&tmr->it.rcu, k_itimer_rcu_free); |
1da177e4 LT |
490 | } |
491 | ||
838394fb TG |
492 | static int common_timer_create(struct k_itimer *new_timer) |
493 | { | |
494 | hrtimer_init(&new_timer->it.real.timer, new_timer->it_clock, 0); | |
495 | return 0; | |
496 | } | |
497 | ||
1da177e4 | 498 | /* Create a POSIX.1b interval timer. */ |
2482097c AV |
499 | static int do_timer_create(clockid_t which_clock, struct sigevent *event, |
500 | timer_t __user *created_timer_id) | |
1da177e4 | 501 | { |
d3ba5a9a | 502 | const struct k_clock *kc = clockid_to_kclock(which_clock); |
2cd499e3 | 503 | struct k_itimer *new_timer; |
ef864c95 | 504 | int error, new_timer_id; |
1da177e4 LT |
505 | int it_id_set = IT_ID_NOT_SET; |
506 | ||
838394fb | 507 | if (!kc) |
1da177e4 | 508 | return -EINVAL; |
838394fb TG |
509 | if (!kc->timer_create) |
510 | return -EOPNOTSUPP; | |
1da177e4 LT |
511 | |
512 | new_timer = alloc_posix_timer(); | |
513 | if (unlikely(!new_timer)) | |
514 | return -EAGAIN; | |
515 | ||
516 | spin_lock_init(&new_timer->it_lock); | |
5ed67f05 PE |
517 | new_timer_id = posix_timer_add(new_timer); |
518 | if (new_timer_id < 0) { | |
519 | error = new_timer_id; | |
1da177e4 LT |
520 | goto out; |
521 | } | |
522 | ||
523 | it_id_set = IT_ID_SET; | |
524 | new_timer->it_id = (timer_t) new_timer_id; | |
525 | new_timer->it_clock = which_clock; | |
d97bb75d | 526 | new_timer->kclock = kc; |
1da177e4 | 527 | new_timer->it_overrun = -1; |
1da177e4 | 528 | |
2482097c | 529 | if (event) { |
36b2f046 | 530 | rcu_read_lock(); |
2482097c | 531 | new_timer->it_pid = get_pid(good_sigevent(event)); |
36b2f046 | 532 | rcu_read_unlock(); |
89992102 | 533 | if (!new_timer->it_pid) { |
1da177e4 LT |
534 | error = -EINVAL; |
535 | goto out; | |
536 | } | |
2482097c AV |
537 | new_timer->it_sigev_notify = event->sigev_notify; |
538 | new_timer->sigq->info.si_signo = event->sigev_signo; | |
539 | new_timer->sigq->info.si_value = event->sigev_value; | |
1da177e4 | 540 | } else { |
2482097c AV |
541 | new_timer->it_sigev_notify = SIGEV_SIGNAL; |
542 | new_timer->sigq->info.si_signo = SIGALRM; | |
543 | memset(&new_timer->sigq->info.si_value, 0, sizeof(sigval_t)); | |
544 | new_timer->sigq->info.si_value.sival_int = new_timer->it_id; | |
89992102 | 545 | new_timer->it_pid = get_pid(task_tgid(current)); |
1da177e4 LT |
546 | } |
547 | ||
717835d9 | 548 | new_timer->sigq->info.si_tid = new_timer->it_id; |
5a9fa730 | 549 | new_timer->sigq->info.si_code = SI_TIMER; |
717835d9 | 550 | |
2b08de00 AV |
551 | if (copy_to_user(created_timer_id, |
552 | &new_timer_id, sizeof (new_timer_id))) { | |
553 | error = -EFAULT; | |
554 | goto out; | |
555 | } | |
556 | ||
838394fb | 557 | error = kc->timer_create(new_timer); |
45e0fffc AV |
558 | if (error) |
559 | goto out; | |
560 | ||
36b2f046 | 561 | spin_lock_irq(¤t->sighand->siglock); |
27af4245 | 562 | new_timer->it_signal = current->signal; |
36b2f046 ON |
563 | list_add(&new_timer->list, ¤t->signal->posix_timers); |
564 | spin_unlock_irq(¤t->sighand->siglock); | |
ef864c95 ON |
565 | |
566 | return 0; | |
838394fb | 567 | /* |
1da177e4 LT |
568 | * In the case of the timer belonging to another task, after |
569 | * the task is unlocked, the timer is owned by the other task | |
570 | * and may cease to exist at any time. Don't use or modify | |
571 | * new_timer after the unlock call. | |
572 | */ | |
1da177e4 | 573 | out: |
ef864c95 | 574 | release_posix_timer(new_timer, it_id_set); |
1da177e4 LT |
575 | return error; |
576 | } | |
577 | ||
2482097c AV |
578 | SYSCALL_DEFINE3(timer_create, const clockid_t, which_clock, |
579 | struct sigevent __user *, timer_event_spec, | |
580 | timer_t __user *, created_timer_id) | |
581 | { | |
582 | if (timer_event_spec) { | |
583 | sigevent_t event; | |
584 | ||
585 | if (copy_from_user(&event, timer_event_spec, sizeof (event))) | |
586 | return -EFAULT; | |
587 | return do_timer_create(which_clock, &event, created_timer_id); | |
588 | } | |
589 | return do_timer_create(which_clock, NULL, created_timer_id); | |
590 | } | |
591 | ||
592 | #ifdef CONFIG_COMPAT | |
593 | COMPAT_SYSCALL_DEFINE3(timer_create, clockid_t, which_clock, | |
594 | struct compat_sigevent __user *, timer_event_spec, | |
595 | timer_t __user *, created_timer_id) | |
596 | { | |
597 | if (timer_event_spec) { | |
598 | sigevent_t event; | |
599 | ||
600 | if (get_compat_sigevent(&event, timer_event_spec)) | |
601 | return -EFAULT; | |
602 | return do_timer_create(which_clock, &event, created_timer_id); | |
603 | } | |
604 | return do_timer_create(which_clock, NULL, created_timer_id); | |
605 | } | |
606 | #endif | |
607 | ||
1da177e4 LT |
608 | /* |
609 | * Locking issues: We need to protect the result of the id look up until | |
610 | * we get the timer locked down so it is not deleted under us. The | |
611 | * removal is done under the idr spinlock so we use that here to bridge | |
612 | * the find to the timer lock. To avoid a dead lock, the timer id MUST | |
613 | * be release with out holding the timer lock. | |
614 | */ | |
20f33a03 | 615 | static struct k_itimer *__lock_timer(timer_t timer_id, unsigned long *flags) |
1da177e4 LT |
616 | { |
617 | struct k_itimer *timr; | |
8af08871 | 618 | |
e182bb38 TH |
619 | /* |
620 | * timer_t could be any type >= int and we want to make sure any | |
621 | * @timer_id outside positive int range fails lookup. | |
622 | */ | |
623 | if ((unsigned long long)timer_id > INT_MAX) | |
624 | return NULL; | |
625 | ||
8af08871 | 626 | rcu_read_lock(); |
5ed67f05 | 627 | timr = posix_timer_by_id(timer_id); |
1da177e4 | 628 | if (timr) { |
8af08871 | 629 | spin_lock_irqsave(&timr->it_lock, *flags); |
89992102 | 630 | if (timr->it_signal == current->signal) { |
8af08871 | 631 | rcu_read_unlock(); |
31d92845 ON |
632 | return timr; |
633 | } | |
8af08871 | 634 | spin_unlock_irqrestore(&timr->it_lock, *flags); |
31d92845 | 635 | } |
8af08871 | 636 | rcu_read_unlock(); |
1da177e4 | 637 | |
31d92845 | 638 | return NULL; |
1da177e4 LT |
639 | } |
640 | ||
91d57bae TG |
641 | static ktime_t common_hrtimer_remaining(struct k_itimer *timr, ktime_t now) |
642 | { | |
643 | struct hrtimer *timer = &timr->it.real.timer; | |
644 | ||
645 | return __hrtimer_expires_remaining_adjusted(timer, now); | |
646 | } | |
647 | ||
648 | static int common_hrtimer_forward(struct k_itimer *timr, ktime_t now) | |
649 | { | |
650 | struct hrtimer *timer = &timr->it.real.timer; | |
651 | ||
652 | return (int)hrtimer_forward(timer, now, timr->it_interval); | |
653 | } | |
654 | ||
1da177e4 LT |
655 | /* |
656 | * Get the time remaining on a POSIX.1b interval timer. This function | |
657 | * is ALWAYS called with spin_lock_irq on the timer, thus it must not | |
658 | * mess with irq. | |
659 | * | |
660 | * We have a couple of messes to clean up here. First there is the case | |
661 | * of a timer that has a requeue pending. These timers should appear to | |
662 | * be in the timer list with an expiry as if we were to requeue them | |
663 | * now. | |
664 | * | |
665 | * The second issue is the SIGEV_NONE timer which may be active but is | |
666 | * not really ever put in the timer list (to save system resources). | |
667 | * This timer may be expired, and if so, we will do it here. Otherwise | |
668 | * it is the same as a requeue pending timer WRT to what we should | |
669 | * report. | |
670 | */ | |
f2c45807 | 671 | void common_timer_get(struct k_itimer *timr, struct itimerspec64 *cur_setting) |
1da177e4 | 672 | { |
91d57bae | 673 | const struct k_clock *kc = timr->kclock; |
3b98a532 | 674 | ktime_t now, remaining, iv; |
91d57bae TG |
675 | struct timespec64 ts64; |
676 | bool sig_none; | |
1da177e4 | 677 | |
cef31d9a | 678 | sig_none = timr->it_sigev_notify == SIGEV_NONE; |
80105cd0 | 679 | iv = timr->it_interval; |
3b98a532 | 680 | |
becf8b5d | 681 | /* interval timer ? */ |
91d57bae | 682 | if (iv) { |
5f252b32 | 683 | cur_setting->it_interval = ktime_to_timespec64(iv); |
91d57bae TG |
684 | } else if (!timr->it_active) { |
685 | /* | |
686 | * SIGEV_NONE oneshot timers are never queued. Check them | |
687 | * below. | |
688 | */ | |
689 | if (!sig_none) | |
690 | return; | |
691 | } | |
3b98a532 | 692 | |
91d57bae TG |
693 | /* |
694 | * The timespec64 based conversion is suboptimal, but it's not | |
695 | * worth to implement yet another callback. | |
696 | */ | |
697 | kc->clock_get(timr->it_clock, &ts64); | |
698 | now = timespec64_to_ktime(ts64); | |
3b98a532 | 699 | |
becf8b5d | 700 | /* |
91d57bae TG |
701 | * When a requeue is pending or this is a SIGEV_NONE timer move the |
702 | * expiry time forward by intervals, so expiry is > now. | |
becf8b5d | 703 | */ |
91d57bae TG |
704 | if (iv && (timr->it_requeue_pending & REQUEUE_PENDING || sig_none)) |
705 | timr->it_overrun += kc->timer_forward(timr, now); | |
3b98a532 | 706 | |
91d57bae | 707 | remaining = kc->timer_remaining(timr, now); |
becf8b5d | 708 | /* Return 0 only, when the timer is expired and not pending */ |
2456e855 | 709 | if (remaining <= 0) { |
3b98a532 RZ |
710 | /* |
711 | * A single shot SIGEV_NONE timer must return 0, when | |
712 | * it is expired ! | |
713 | */ | |
91d57bae | 714 | if (!sig_none) |
3b98a532 | 715 | cur_setting->it_value.tv_nsec = 1; |
91d57bae | 716 | } else { |
5f252b32 | 717 | cur_setting->it_value = ktime_to_timespec64(remaining); |
91d57bae | 718 | } |
1da177e4 LT |
719 | } |
720 | ||
721 | /* Get the time remaining on a POSIX.1b interval timer. */ | |
b0dc1242 | 722 | static int do_timer_gettime(timer_t timer_id, struct itimerspec64 *setting) |
1da177e4 | 723 | { |
a7319fa2 | 724 | struct k_itimer *timr; |
d3ba5a9a | 725 | const struct k_clock *kc; |
1da177e4 | 726 | unsigned long flags; |
a7319fa2 | 727 | int ret = 0; |
1da177e4 LT |
728 | |
729 | timr = lock_timer(timer_id, &flags); | |
730 | if (!timr) | |
731 | return -EINVAL; | |
732 | ||
b0dc1242 | 733 | memset(setting, 0, sizeof(*setting)); |
d97bb75d | 734 | kc = timr->kclock; |
a7319fa2 TG |
735 | if (WARN_ON_ONCE(!kc || !kc->timer_get)) |
736 | ret = -EINVAL; | |
737 | else | |
b0dc1242 | 738 | kc->timer_get(timr, setting); |
1da177e4 LT |
739 | |
740 | unlock_timer(timr, flags); | |
b0dc1242 AV |
741 | return ret; |
742 | } | |
1da177e4 | 743 | |
b0dc1242 AV |
744 | /* Get the time remaining on a POSIX.1b interval timer. */ |
745 | SYSCALL_DEFINE2(timer_gettime, timer_t, timer_id, | |
746 | struct itimerspec __user *, setting) | |
747 | { | |
725816e8 | 748 | struct itimerspec64 cur_setting; |
1da177e4 | 749 | |
725816e8 | 750 | int ret = do_timer_gettime(timer_id, &cur_setting); |
b0dc1242 | 751 | if (!ret) { |
725816e8 | 752 | if (put_itimerspec64(&cur_setting, setting)) |
b0dc1242 AV |
753 | ret = -EFAULT; |
754 | } | |
a7319fa2 | 755 | return ret; |
1da177e4 | 756 | } |
becf8b5d | 757 | |
b0dc1242 AV |
758 | #ifdef CONFIG_COMPAT |
759 | COMPAT_SYSCALL_DEFINE2(timer_gettime, timer_t, timer_id, | |
760 | struct compat_itimerspec __user *, setting) | |
761 | { | |
725816e8 | 762 | struct itimerspec64 cur_setting; |
b0dc1242 | 763 | |
725816e8 | 764 | int ret = do_timer_gettime(timer_id, &cur_setting); |
b0dc1242 | 765 | if (!ret) { |
725816e8 | 766 | if (put_compat_itimerspec64(&cur_setting, setting)) |
b0dc1242 AV |
767 | ret = -EFAULT; |
768 | } | |
769 | return ret; | |
770 | } | |
771 | #endif | |
772 | ||
1da177e4 LT |
773 | /* |
774 | * Get the number of overruns of a POSIX.1b interval timer. This is to | |
775 | * be the overrun of the timer last delivered. At the same time we are | |
776 | * accumulating overruns on the next timer. The overrun is frozen when | |
777 | * the signal is delivered, either at the notify time (if the info block | |
778 | * is not queued) or at the actual delivery time (as we are informed by | |
96fe3b07 | 779 | * the call back to posixtimer_rearm(). So all we need to do is |
1da177e4 LT |
780 | * to pick up the frozen overrun. |
781 | */ | |
362e9c07 | 782 | SYSCALL_DEFINE1(timer_getoverrun, timer_t, timer_id) |
1da177e4 LT |
783 | { |
784 | struct k_itimer *timr; | |
785 | int overrun; | |
5ba25331 | 786 | unsigned long flags; |
1da177e4 LT |
787 | |
788 | timr = lock_timer(timer_id, &flags); | |
789 | if (!timr) | |
790 | return -EINVAL; | |
791 | ||
792 | overrun = timr->it_overrun_last; | |
793 | unlock_timer(timr, flags); | |
794 | ||
795 | return overrun; | |
796 | } | |
1da177e4 | 797 | |
eae1c4ae TG |
798 | static void common_hrtimer_arm(struct k_itimer *timr, ktime_t expires, |
799 | bool absolute, bool sigev_none) | |
800 | { | |
801 | struct hrtimer *timer = &timr->it.real.timer; | |
802 | enum hrtimer_mode mode; | |
803 | ||
804 | mode = absolute ? HRTIMER_MODE_ABS : HRTIMER_MODE_REL; | |
67edab48 TG |
805 | /* |
806 | * Posix magic: Relative CLOCK_REALTIME timers are not affected by | |
807 | * clock modifications, so they become CLOCK_MONOTONIC based under the | |
808 | * hood. See hrtimer_init(). Update timr->kclock, so the generic | |
809 | * functions which use timr->kclock->clock_get() work. | |
810 | * | |
811 | * Note: it_clock stays unmodified, because the next timer_set() might | |
812 | * use ABSTIME, so it needs to switch back. | |
813 | */ | |
814 | if (timr->it_clock == CLOCK_REALTIME) | |
815 | timr->kclock = absolute ? &clock_realtime : &clock_monotonic; | |
816 | ||
eae1c4ae TG |
817 | hrtimer_init(&timr->it.real.timer, timr->it_clock, mode); |
818 | timr->it.real.timer.function = posix_timer_fn; | |
819 | ||
820 | if (!absolute) | |
821 | expires = ktime_add_safe(expires, timer->base->get_time()); | |
822 | hrtimer_set_expires(timer, expires); | |
823 | ||
824 | if (!sigev_none) | |
825 | hrtimer_start_expires(timer, HRTIMER_MODE_ABS); | |
826 | } | |
827 | ||
828 | static int common_hrtimer_try_to_cancel(struct k_itimer *timr) | |
829 | { | |
830 | return hrtimer_try_to_cancel(&timr->it.real.timer); | |
831 | } | |
832 | ||
1da177e4 | 833 | /* Set a POSIX.1b interval timer. */ |
f2c45807 TG |
834 | int common_timer_set(struct k_itimer *timr, int flags, |
835 | struct itimerspec64 *new_setting, | |
836 | struct itimerspec64 *old_setting) | |
1da177e4 | 837 | { |
eae1c4ae TG |
838 | const struct k_clock *kc = timr->kclock; |
839 | bool sigev_none; | |
840 | ktime_t expires; | |
1da177e4 LT |
841 | |
842 | if (old_setting) | |
843 | common_timer_get(timr, old_setting); | |
844 | ||
eae1c4ae | 845 | /* Prevent rearming by clearing the interval */ |
80105cd0 | 846 | timr->it_interval = 0; |
1da177e4 | 847 | /* |
eae1c4ae TG |
848 | * Careful here. On SMP systems the timer expiry function could be |
849 | * active and spinning on timr->it_lock. | |
1da177e4 | 850 | */ |
eae1c4ae | 851 | if (kc->timer_try_to_cancel(timr) < 0) |
1da177e4 | 852 | return TIMER_RETRY; |
1da177e4 | 853 | |
21e55c1f TG |
854 | timr->it_active = 0; |
855 | timr->it_requeue_pending = (timr->it_requeue_pending + 2) & | |
1da177e4 LT |
856 | ~REQUEUE_PENDING; |
857 | timr->it_overrun_last = 0; | |
1da177e4 | 858 | |
eae1c4ae | 859 | /* Switch off the timer when it_value is zero */ |
becf8b5d TG |
860 | if (!new_setting->it_value.tv_sec && !new_setting->it_value.tv_nsec) |
861 | return 0; | |
1da177e4 | 862 | |
80105cd0 | 863 | timr->it_interval = timespec64_to_ktime(new_setting->it_interval); |
eae1c4ae | 864 | expires = timespec64_to_ktime(new_setting->it_value); |
cef31d9a | 865 | sigev_none = timr->it_sigev_notify == SIGEV_NONE; |
becf8b5d | 866 | |
eae1c4ae TG |
867 | kc->timer_arm(timr, expires, flags & TIMER_ABSTIME, sigev_none); |
868 | timr->it_active = !sigev_none; | |
1da177e4 LT |
869 | return 0; |
870 | } | |
871 | ||
1acbe770 AV |
872 | static int do_timer_settime(timer_t timer_id, int flags, |
873 | struct itimerspec64 *new_spec64, | |
874 | struct itimerspec64 *old_spec64) | |
1da177e4 | 875 | { |
1acbe770 | 876 | const struct k_clock *kc; |
5f252b32 | 877 | struct k_itimer *timr; |
5ba25331 | 878 | unsigned long flag; |
5f252b32 | 879 | int error = 0; |
1da177e4 | 880 | |
1acbe770 AV |
881 | if (!timespec64_valid(&new_spec64->it_interval) || |
882 | !timespec64_valid(&new_spec64->it_value)) | |
1da177e4 LT |
883 | return -EINVAL; |
884 | ||
1acbe770 AV |
885 | if (old_spec64) |
886 | memset(old_spec64, 0, sizeof(*old_spec64)); | |
1da177e4 LT |
887 | retry: |
888 | timr = lock_timer(timer_id, &flag); | |
889 | if (!timr) | |
890 | return -EINVAL; | |
891 | ||
d97bb75d | 892 | kc = timr->kclock; |
27722df1 TG |
893 | if (WARN_ON_ONCE(!kc || !kc->timer_set)) |
894 | error = -EINVAL; | |
895 | else | |
1acbe770 | 896 | error = kc->timer_set(timr, flags, new_spec64, old_spec64); |
1da177e4 LT |
897 | |
898 | unlock_timer(timr, flag); | |
899 | if (error == TIMER_RETRY) { | |
1acbe770 | 900 | old_spec64 = NULL; // We already got the old time... |
1da177e4 LT |
901 | goto retry; |
902 | } | |
903 | ||
1acbe770 AV |
904 | return error; |
905 | } | |
1da177e4 | 906 | |
1acbe770 AV |
907 | /* Set a POSIX.1b interval timer */ |
908 | SYSCALL_DEFINE4(timer_settime, timer_t, timer_id, int, flags, | |
909 | const struct itimerspec __user *, new_setting, | |
910 | struct itimerspec __user *, old_setting) | |
911 | { | |
725816e8 DD |
912 | struct itimerspec64 new_spec, old_spec; |
913 | struct itimerspec64 *rtn = old_setting ? &old_spec : NULL; | |
1acbe770 AV |
914 | int error = 0; |
915 | ||
916 | if (!new_setting) | |
917 | return -EINVAL; | |
918 | ||
725816e8 | 919 | if (get_itimerspec64(&new_spec, new_setting)) |
1acbe770 | 920 | return -EFAULT; |
1acbe770 | 921 | |
725816e8 | 922 | error = do_timer_settime(timer_id, flags, &new_spec, rtn); |
1acbe770 | 923 | if (!error && old_setting) { |
725816e8 | 924 | if (put_itimerspec64(&old_spec, old_setting)) |
1acbe770 AV |
925 | error = -EFAULT; |
926 | } | |
927 | return error; | |
928 | } | |
929 | ||
930 | #ifdef CONFIG_COMPAT | |
931 | COMPAT_SYSCALL_DEFINE4(timer_settime, timer_t, timer_id, int, flags, | |
932 | struct compat_itimerspec __user *, new, | |
933 | struct compat_itimerspec __user *, old) | |
934 | { | |
725816e8 DD |
935 | struct itimerspec64 new_spec, old_spec; |
936 | struct itimerspec64 *rtn = old ? &old_spec : NULL; | |
1acbe770 AV |
937 | int error = 0; |
938 | ||
939 | if (!new) | |
940 | return -EINVAL; | |
725816e8 | 941 | if (get_compat_itimerspec64(&new_spec, new)) |
1acbe770 AV |
942 | return -EFAULT; |
943 | ||
725816e8 | 944 | error = do_timer_settime(timer_id, flags, &new_spec, rtn); |
1acbe770 | 945 | if (!error && old) { |
725816e8 | 946 | if (put_compat_itimerspec64(&old_spec, old)) |
1acbe770 AV |
947 | error = -EFAULT; |
948 | } | |
1da177e4 LT |
949 | return error; |
950 | } | |
1acbe770 | 951 | #endif |
1da177e4 | 952 | |
f2c45807 | 953 | int common_timer_del(struct k_itimer *timer) |
1da177e4 | 954 | { |
eae1c4ae | 955 | const struct k_clock *kc = timer->kclock; |
f972be33 | 956 | |
eae1c4ae TG |
957 | timer->it_interval = 0; |
958 | if (kc->timer_try_to_cancel(timer) < 0) | |
1da177e4 | 959 | return TIMER_RETRY; |
21e55c1f | 960 | timer->it_active = 0; |
1da177e4 LT |
961 | return 0; |
962 | } | |
963 | ||
964 | static inline int timer_delete_hook(struct k_itimer *timer) | |
965 | { | |
d97bb75d | 966 | const struct k_clock *kc = timer->kclock; |
6761c670 TG |
967 | |
968 | if (WARN_ON_ONCE(!kc || !kc->timer_del)) | |
969 | return -EINVAL; | |
970 | return kc->timer_del(timer); | |
1da177e4 LT |
971 | } |
972 | ||
973 | /* Delete a POSIX.1b interval timer. */ | |
362e9c07 | 974 | SYSCALL_DEFINE1(timer_delete, timer_t, timer_id) |
1da177e4 LT |
975 | { |
976 | struct k_itimer *timer; | |
5ba25331 | 977 | unsigned long flags; |
1da177e4 | 978 | |
1da177e4 | 979 | retry_delete: |
1da177e4 LT |
980 | timer = lock_timer(timer_id, &flags); |
981 | if (!timer) | |
982 | return -EINVAL; | |
983 | ||
becf8b5d | 984 | if (timer_delete_hook(timer) == TIMER_RETRY) { |
1da177e4 LT |
985 | unlock_timer(timer, flags); |
986 | goto retry_delete; | |
987 | } | |
becf8b5d | 988 | |
1da177e4 LT |
989 | spin_lock(¤t->sighand->siglock); |
990 | list_del(&timer->list); | |
991 | spin_unlock(¤t->sighand->siglock); | |
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 | return 0; | |
1001 | } | |
becf8b5d | 1002 | |
1da177e4 LT |
1003 | /* |
1004 | * return timer owned by the process, used by exit_itimers | |
1005 | */ | |
858119e1 | 1006 | static void itimer_delete(struct k_itimer *timer) |
1da177e4 LT |
1007 | { |
1008 | unsigned long flags; | |
1009 | ||
1da177e4 | 1010 | retry_delete: |
1da177e4 LT |
1011 | spin_lock_irqsave(&timer->it_lock, flags); |
1012 | ||
becf8b5d | 1013 | if (timer_delete_hook(timer) == TIMER_RETRY) { |
1da177e4 LT |
1014 | unlock_timer(timer, flags); |
1015 | goto retry_delete; | |
1016 | } | |
1da177e4 LT |
1017 | list_del(&timer->list); |
1018 | /* | |
1019 | * This keeps any tasks waiting on the spin lock from thinking | |
1020 | * they got something (see the lock code above). | |
1021 | */ | |
89992102 | 1022 | timer->it_signal = NULL; |
4b7a1304 | 1023 | |
1da177e4 LT |
1024 | unlock_timer(timer, flags); |
1025 | release_posix_timer(timer, IT_ID_SET); | |
1026 | } | |
1027 | ||
1028 | /* | |
25f407f0 | 1029 | * This is called by do_exit or de_thread, only when there are no more |
1da177e4 LT |
1030 | * references to the shared signal_struct. |
1031 | */ | |
1032 | void exit_itimers(struct signal_struct *sig) | |
1033 | { | |
1034 | struct k_itimer *tmr; | |
1035 | ||
1036 | while (!list_empty(&sig->posix_timers)) { | |
1037 | tmr = list_entry(sig->posix_timers.next, struct k_itimer, list); | |
1038 | itimer_delete(tmr); | |
1039 | } | |
1040 | } | |
1041 | ||
362e9c07 | 1042 | SYSCALL_DEFINE2(clock_settime, const clockid_t, which_clock, |
6d5b8413 | 1043 | const struct __kernel_timespec __user *, tp) |
1da177e4 | 1044 | { |
d3ba5a9a | 1045 | const struct k_clock *kc = clockid_to_kclock(which_clock); |
5c499410 | 1046 | struct timespec64 new_tp; |
1da177e4 | 1047 | |
26f9a479 | 1048 | if (!kc || !kc->clock_set) |
1da177e4 | 1049 | return -EINVAL; |
26f9a479 | 1050 | |
5c499410 | 1051 | if (get_timespec64(&new_tp, tp)) |
1da177e4 LT |
1052 | return -EFAULT; |
1053 | ||
5c499410 | 1054 | return kc->clock_set(which_clock, &new_tp); |
1da177e4 LT |
1055 | } |
1056 | ||
362e9c07 | 1057 | SYSCALL_DEFINE2(clock_gettime, const clockid_t, which_clock, |
6d5b8413 | 1058 | struct __kernel_timespec __user *, tp) |
1da177e4 | 1059 | { |
d3ba5a9a | 1060 | const struct k_clock *kc = clockid_to_kclock(which_clock); |
5c499410 | 1061 | struct timespec64 kernel_tp; |
1da177e4 LT |
1062 | int error; |
1063 | ||
42285777 | 1064 | if (!kc) |
1da177e4 | 1065 | return -EINVAL; |
42285777 | 1066 | |
5c499410 | 1067 | error = kc->clock_get(which_clock, &kernel_tp); |
42285777 | 1068 | |
5c499410 | 1069 | if (!error && put_timespec64(&kernel_tp, tp)) |
1da177e4 LT |
1070 | error = -EFAULT; |
1071 | ||
1072 | return error; | |
1da177e4 LT |
1073 | } |
1074 | ||
f1f1d5eb RC |
1075 | SYSCALL_DEFINE2(clock_adjtime, const clockid_t, which_clock, |
1076 | struct timex __user *, utx) | |
1077 | { | |
d3ba5a9a | 1078 | const struct k_clock *kc = clockid_to_kclock(which_clock); |
f1f1d5eb RC |
1079 | struct timex ktx; |
1080 | int err; | |
1081 | ||
1082 | if (!kc) | |
1083 | return -EINVAL; | |
1084 | if (!kc->clock_adj) | |
1085 | return -EOPNOTSUPP; | |
1086 | ||
1087 | if (copy_from_user(&ktx, utx, sizeof(ktx))) | |
1088 | return -EFAULT; | |
1089 | ||
1090 | err = kc->clock_adj(which_clock, &ktx); | |
1091 | ||
f0dbe81f | 1092 | if (err >= 0 && copy_to_user(utx, &ktx, sizeof(ktx))) |
f1f1d5eb RC |
1093 | return -EFAULT; |
1094 | ||
1095 | return err; | |
1096 | } | |
1097 | ||
d822cdcc | 1098 | SYSCALL_DEFINE2(clock_getres, const clockid_t, which_clock, |
6d5b8413 | 1099 | struct __kernel_timespec __user *, tp) |
d822cdcc AV |
1100 | { |
1101 | const struct k_clock *kc = clockid_to_kclock(which_clock); | |
5c499410 | 1102 | struct timespec64 rtn_tp; |
d822cdcc AV |
1103 | int error; |
1104 | ||
1105 | if (!kc) | |
1106 | return -EINVAL; | |
1107 | ||
5c499410 | 1108 | error = kc->clock_getres(which_clock, &rtn_tp); |
d822cdcc | 1109 | |
5c499410 | 1110 | if (!error && tp && put_timespec64(&rtn_tp, tp)) |
d822cdcc AV |
1111 | error = -EFAULT; |
1112 | ||
1113 | return error; | |
1114 | } | |
1115 | ||
b5793b0d | 1116 | #ifdef CONFIG_COMPAT_32BIT_TIME |
3a4d44b6 | 1117 | |
d822cdcc AV |
1118 | COMPAT_SYSCALL_DEFINE2(clock_settime, clockid_t, which_clock, |
1119 | struct compat_timespec __user *, tp) | |
1120 | { | |
1121 | const struct k_clock *kc = clockid_to_kclock(which_clock); | |
5c499410 | 1122 | struct timespec64 ts; |
d822cdcc AV |
1123 | |
1124 | if (!kc || !kc->clock_set) | |
1125 | return -EINVAL; | |
1126 | ||
5c499410 | 1127 | if (compat_get_timespec64(&ts, tp)) |
d822cdcc AV |
1128 | return -EFAULT; |
1129 | ||
5c499410 | 1130 | return kc->clock_set(which_clock, &ts); |
d822cdcc AV |
1131 | } |
1132 | ||
1133 | COMPAT_SYSCALL_DEFINE2(clock_gettime, clockid_t, which_clock, | |
1134 | struct compat_timespec __user *, tp) | |
1135 | { | |
1136 | const struct k_clock *kc = clockid_to_kclock(which_clock); | |
5c499410 DD |
1137 | struct timespec64 ts; |
1138 | int err; | |
d822cdcc AV |
1139 | |
1140 | if (!kc) | |
1141 | return -EINVAL; | |
1142 | ||
5c499410 | 1143 | err = kc->clock_get(which_clock, &ts); |
d822cdcc | 1144 | |
5c499410 DD |
1145 | if (!err && compat_put_timespec64(&ts, tp)) |
1146 | err = -EFAULT; | |
d822cdcc | 1147 | |
5c499410 | 1148 | return err; |
d822cdcc AV |
1149 | } |
1150 | ||
b5793b0d DD |
1151 | #endif |
1152 | ||
1153 | #ifdef CONFIG_COMPAT | |
1154 | ||
3a4d44b6 AV |
1155 | COMPAT_SYSCALL_DEFINE2(clock_adjtime, clockid_t, which_clock, |
1156 | struct compat_timex __user *, utp) | |
1157 | { | |
1158 | const struct k_clock *kc = clockid_to_kclock(which_clock); | |
1159 | struct timex ktx; | |
1160 | int err; | |
1161 | ||
1162 | if (!kc) | |
1163 | return -EINVAL; | |
1164 | if (!kc->clock_adj) | |
1165 | return -EOPNOTSUPP; | |
1166 | ||
1167 | err = compat_get_timex(&ktx, utp); | |
1168 | if (err) | |
1169 | return err; | |
1170 | ||
1171 | err = kc->clock_adj(which_clock, &ktx); | |
1172 | ||
1173 | if (err >= 0) | |
1174 | err = compat_put_timex(utp, &ktx); | |
1175 | ||
1176 | return err; | |
1177 | } | |
3a4d44b6 | 1178 | |
b5793b0d DD |
1179 | #endif |
1180 | ||
1181 | #ifdef CONFIG_COMPAT_32BIT_TIME | |
1182 | ||
d822cdcc AV |
1183 | COMPAT_SYSCALL_DEFINE2(clock_getres, clockid_t, which_clock, |
1184 | struct compat_timespec __user *, tp) | |
1da177e4 | 1185 | { |
d3ba5a9a | 1186 | const struct k_clock *kc = clockid_to_kclock(which_clock); |
5c499410 DD |
1187 | struct timespec64 ts; |
1188 | int err; | |
1da177e4 | 1189 | |
e5e542ee | 1190 | if (!kc) |
1da177e4 LT |
1191 | return -EINVAL; |
1192 | ||
5c499410 DD |
1193 | err = kc->clock_getres(which_clock, &ts); |
1194 | if (!err && tp && compat_put_timespec64(&ts, tp)) | |
1195 | return -EFAULT; | |
1da177e4 | 1196 | |
5c499410 | 1197 | return err; |
1da177e4 | 1198 | } |
5c499410 | 1199 | |
d822cdcc | 1200 | #endif |
1da177e4 | 1201 | |
97735f25 TG |
1202 | /* |
1203 | * nanosleep for monotonic and realtime clocks | |
1204 | */ | |
1205 | static int common_nsleep(const clockid_t which_clock, int flags, | |
938e7cf2 | 1206 | const struct timespec64 *rqtp) |
97735f25 | 1207 | { |
938e7cf2 | 1208 | return hrtimer_nanosleep(rqtp, flags & TIMER_ABSTIME ? |
080344b9 ON |
1209 | HRTIMER_MODE_ABS : HRTIMER_MODE_REL, |
1210 | which_clock); | |
97735f25 | 1211 | } |
1da177e4 | 1212 | |
362e9c07 | 1213 | SYSCALL_DEFINE4(clock_nanosleep, const clockid_t, which_clock, int, flags, |
01909974 DD |
1214 | const struct __kernel_timespec __user *, rqtp, |
1215 | struct __kernel_timespec __user *, rmtp) | |
1da177e4 | 1216 | { |
d3ba5a9a | 1217 | const struct k_clock *kc = clockid_to_kclock(which_clock); |
c0edd7c9 | 1218 | struct timespec64 t; |
1da177e4 | 1219 | |
a5cd2880 | 1220 | if (!kc) |
1da177e4 | 1221 | return -EINVAL; |
a5cd2880 TG |
1222 | if (!kc->nsleep) |
1223 | return -ENANOSLEEP_NOTSUP; | |
1da177e4 | 1224 | |
c0edd7c9 | 1225 | if (get_timespec64(&t, rqtp)) |
1da177e4 LT |
1226 | return -EFAULT; |
1227 | ||
c0edd7c9 | 1228 | if (!timespec64_valid(&t)) |
1da177e4 | 1229 | return -EINVAL; |
99e6c0e6 AV |
1230 | if (flags & TIMER_ABSTIME) |
1231 | rmtp = NULL; | |
edbeda46 | 1232 | current->restart_block.nanosleep.type = rmtp ? TT_NATIVE : TT_NONE; |
99e6c0e6 | 1233 | current->restart_block.nanosleep.rmtp = rmtp; |
1da177e4 | 1234 | |
c0edd7c9 | 1235 | return kc->nsleep(which_clock, flags, &t); |
1da177e4 | 1236 | } |
1711ef38 | 1237 | |
b5793b0d DD |
1238 | #ifdef CONFIG_COMPAT_32BIT_TIME |
1239 | ||
edbeda46 AV |
1240 | COMPAT_SYSCALL_DEFINE4(clock_nanosleep, clockid_t, which_clock, int, flags, |
1241 | struct compat_timespec __user *, rqtp, | |
1242 | struct compat_timespec __user *, rmtp) | |
1711ef38 | 1243 | { |
d3ba5a9a | 1244 | const struct k_clock *kc = clockid_to_kclock(which_clock); |
c0edd7c9 | 1245 | struct timespec64 t; |
59bd5bc2 | 1246 | |
edbeda46 | 1247 | if (!kc) |
59bd5bc2 | 1248 | return -EINVAL; |
edbeda46 AV |
1249 | if (!kc->nsleep) |
1250 | return -ENANOSLEEP_NOTSUP; | |
1251 | ||
c0edd7c9 | 1252 | if (compat_get_timespec64(&t, rqtp)) |
edbeda46 | 1253 | return -EFAULT; |
1711ef38 | 1254 | |
c0edd7c9 | 1255 | if (!timespec64_valid(&t)) |
edbeda46 AV |
1256 | return -EINVAL; |
1257 | if (flags & TIMER_ABSTIME) | |
1258 | rmtp = NULL; | |
1259 | current->restart_block.nanosleep.type = rmtp ? TT_COMPAT : TT_NONE; | |
1260 | current->restart_block.nanosleep.compat_rmtp = rmtp; | |
1261 | ||
c0edd7c9 | 1262 | return kc->nsleep(which_clock, flags, &t); |
1711ef38 | 1263 | } |
b5793b0d | 1264 | |
edbeda46 | 1265 | #endif |
6631fa12 TG |
1266 | |
1267 | static const struct k_clock clock_realtime = { | |
eae1c4ae TG |
1268 | .clock_getres = posix_get_hrtimer_res, |
1269 | .clock_get = posix_clock_realtime_get, | |
1270 | .clock_set = posix_clock_realtime_set, | |
1271 | .clock_adj = posix_clock_realtime_adj, | |
1272 | .nsleep = common_nsleep, | |
eae1c4ae TG |
1273 | .timer_create = common_timer_create, |
1274 | .timer_set = common_timer_set, | |
1275 | .timer_get = common_timer_get, | |
1276 | .timer_del = common_timer_del, | |
1277 | .timer_rearm = common_hrtimer_rearm, | |
1278 | .timer_forward = common_hrtimer_forward, | |
1279 | .timer_remaining = common_hrtimer_remaining, | |
1280 | .timer_try_to_cancel = common_hrtimer_try_to_cancel, | |
1281 | .timer_arm = common_hrtimer_arm, | |
6631fa12 TG |
1282 | }; |
1283 | ||
1284 | static const struct k_clock clock_monotonic = { | |
eae1c4ae TG |
1285 | .clock_getres = posix_get_hrtimer_res, |
1286 | .clock_get = posix_ktime_get_ts, | |
1287 | .nsleep = common_nsleep, | |
eae1c4ae TG |
1288 | .timer_create = common_timer_create, |
1289 | .timer_set = common_timer_set, | |
1290 | .timer_get = common_timer_get, | |
1291 | .timer_del = common_timer_del, | |
1292 | .timer_rearm = common_hrtimer_rearm, | |
1293 | .timer_forward = common_hrtimer_forward, | |
1294 | .timer_remaining = common_hrtimer_remaining, | |
1295 | .timer_try_to_cancel = common_hrtimer_try_to_cancel, | |
1296 | .timer_arm = common_hrtimer_arm, | |
6631fa12 TG |
1297 | }; |
1298 | ||
1299 | static const struct k_clock clock_monotonic_raw = { | |
eae1c4ae TG |
1300 | .clock_getres = posix_get_hrtimer_res, |
1301 | .clock_get = posix_get_monotonic_raw, | |
6631fa12 TG |
1302 | }; |
1303 | ||
1304 | static const struct k_clock clock_realtime_coarse = { | |
eae1c4ae TG |
1305 | .clock_getres = posix_get_coarse_res, |
1306 | .clock_get = posix_get_realtime_coarse, | |
6631fa12 TG |
1307 | }; |
1308 | ||
1309 | static const struct k_clock clock_monotonic_coarse = { | |
eae1c4ae TG |
1310 | .clock_getres = posix_get_coarse_res, |
1311 | .clock_get = posix_get_monotonic_coarse, | |
6631fa12 TG |
1312 | }; |
1313 | ||
1314 | static const struct k_clock clock_tai = { | |
eae1c4ae TG |
1315 | .clock_getres = posix_get_hrtimer_res, |
1316 | .clock_get = posix_get_tai, | |
1317 | .nsleep = common_nsleep, | |
eae1c4ae TG |
1318 | .timer_create = common_timer_create, |
1319 | .timer_set = common_timer_set, | |
1320 | .timer_get = common_timer_get, | |
1321 | .timer_del = common_timer_del, | |
1322 | .timer_rearm = common_hrtimer_rearm, | |
1323 | .timer_forward = common_hrtimer_forward, | |
1324 | .timer_remaining = common_hrtimer_remaining, | |
1325 | .timer_try_to_cancel = common_hrtimer_try_to_cancel, | |
1326 | .timer_arm = common_hrtimer_arm, | |
6631fa12 TG |
1327 | }; |
1328 | ||
a3ed0e43 | 1329 | static const struct k_clock clock_boottime = { |
eae1c4ae | 1330 | .clock_getres = posix_get_hrtimer_res, |
a3ed0e43 TG |
1331 | .clock_get = posix_get_boottime, |
1332 | .nsleep = common_nsleep, | |
1333 | .timer_create = common_timer_create, | |
1334 | .timer_set = common_timer_set, | |
1335 | .timer_get = common_timer_get, | |
1336 | .timer_del = common_timer_del, | |
1337 | .timer_rearm = common_hrtimer_rearm, | |
1338 | .timer_forward = common_hrtimer_forward, | |
1339 | .timer_remaining = common_hrtimer_remaining, | |
1340 | .timer_try_to_cancel = common_hrtimer_try_to_cancel, | |
1341 | .timer_arm = common_hrtimer_arm, | |
6631fa12 TG |
1342 | }; |
1343 | ||
1344 | static const struct k_clock * const posix_clocks[] = { | |
1345 | [CLOCK_REALTIME] = &clock_realtime, | |
1346 | [CLOCK_MONOTONIC] = &clock_monotonic, | |
1347 | [CLOCK_PROCESS_CPUTIME_ID] = &clock_process, | |
1348 | [CLOCK_THREAD_CPUTIME_ID] = &clock_thread, | |
1349 | [CLOCK_MONOTONIC_RAW] = &clock_monotonic_raw, | |
1350 | [CLOCK_REALTIME_COARSE] = &clock_realtime_coarse, | |
1351 | [CLOCK_MONOTONIC_COARSE] = &clock_monotonic_coarse, | |
a3ed0e43 | 1352 | [CLOCK_BOOTTIME] = &clock_boottime, |
6631fa12 TG |
1353 | [CLOCK_REALTIME_ALARM] = &alarm_clock, |
1354 | [CLOCK_BOOTTIME_ALARM] = &alarm_clock, | |
1355 | [CLOCK_TAI] = &clock_tai, | |
1356 | }; | |
1357 | ||
1358 | static const struct k_clock *clockid_to_kclock(const clockid_t id) | |
1359 | { | |
19b558db TG |
1360 | clockid_t idx = id; |
1361 | ||
1362 | if (id < 0) { | |
6631fa12 TG |
1363 | return (id & CLOCKFD_MASK) == CLOCKFD ? |
1364 | &clock_posix_dynamic : &clock_posix_cpu; | |
19b558db | 1365 | } |
6631fa12 | 1366 | |
19b558db | 1367 | if (id >= ARRAY_SIZE(posix_clocks)) |
6631fa12 | 1368 | return NULL; |
19b558db TG |
1369 | |
1370 | return posix_clocks[array_index_nospec(idx, ARRAY_SIZE(posix_clocks))]; | |
6631fa12 | 1371 | } |