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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 | { |
3c9c12f4 | 231 | getrawmonotonic64(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 | { |
3c9c12f4 | 238 | *tp = current_kernel_time64(); |
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 | { |
3c9c12f4 | 245 | *tp = get_monotonic_coarse64(); |
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 | |
3c9c12f4 | 255 | static int posix_get_tai(clockid_t which_clock, struct timespec64 *tp) |
7fdd7f89 | 256 | { |
3c9c12f4 | 257 | timekeeping_clocktai64(tp); |
7fdd7f89 JS |
258 | return 0; |
259 | } | |
260 | ||
72199320 TG |
261 | static int posix_get_monotonic_active(clockid_t which_clock, |
262 | struct timespec64 *tp) | |
1ff3c967 | 263 | { |
72199320 | 264 | ktime_get_active_ts64(tp); |
1ff3c967 JS |
265 | return 0; |
266 | } | |
7fdd7f89 | 267 | |
d2e3e0ca | 268 | static int posix_get_hrtimer_res(clockid_t which_clock, struct timespec64 *tp) |
056a3cac TG |
269 | { |
270 | tp->tv_sec = 0; | |
271 | tp->tv_nsec = hrtimer_resolution; | |
272 | return 0; | |
273 | } | |
274 | ||
1da177e4 LT |
275 | /* |
276 | * Initialize everything, well, just everything in Posix clocks/timers ;) | |
277 | */ | |
278 | static __init int init_posix_timers(void) | |
279 | { | |
1da177e4 | 280 | posix_timers_cache = kmem_cache_create("posix_timers_cache", |
040b5c6f AD |
281 | sizeof (struct k_itimer), 0, SLAB_PANIC, |
282 | NULL); | |
1da177e4 LT |
283 | return 0; |
284 | } | |
1da177e4 LT |
285 | __initcall(init_posix_timers); |
286 | ||
f37fb0aa | 287 | static void common_hrtimer_rearm(struct k_itimer *timr) |
1da177e4 | 288 | { |
44f21475 RZ |
289 | struct hrtimer *timer = &timr->it.real.timer; |
290 | ||
80105cd0 | 291 | if (!timr->it_interval) |
1da177e4 LT |
292 | return; |
293 | ||
4d672e7a DL |
294 | timr->it_overrun += (unsigned int) hrtimer_forward(timer, |
295 | timer->base->get_time(), | |
80105cd0 | 296 | timr->it_interval); |
44f21475 | 297 | hrtimer_restart(timer); |
1da177e4 LT |
298 | } |
299 | ||
300 | /* | |
301 | * This function is exported for use by the signal deliver code. It is | |
302 | * called just prior to the info block being released and passes that | |
303 | * block to us. It's function is to update the overrun entry AND to | |
304 | * restart the timer. It should only be called if the timer is to be | |
305 | * restarted (i.e. we have flagged this in the sys_private entry of the | |
306 | * info block). | |
307 | * | |
25985edc | 308 | * To protect against the timer going away while the interrupt is queued, |
1da177e4 LT |
309 | * we require that the it_requeue_pending flag be set. |
310 | */ | |
96fe3b07 | 311 | void posixtimer_rearm(struct siginfo *info) |
1da177e4 LT |
312 | { |
313 | struct k_itimer *timr; | |
314 | unsigned long flags; | |
315 | ||
316 | timr = lock_timer(info->si_tid, &flags); | |
af888d67 TG |
317 | if (!timr) |
318 | return; | |
1da177e4 | 319 | |
af888d67 | 320 | if (timr->it_requeue_pending == info->si_sys_private) { |
f37fb0aa | 321 | timr->kclock->timer_rearm(timr); |
1da177e4 | 322 | |
21e55c1f | 323 | timr->it_active = 1; |
af888d67 TG |
324 | timr->it_overrun_last = timr->it_overrun; |
325 | timr->it_overrun = -1; | |
326 | ++timr->it_requeue_pending; | |
327 | ||
54da1174 | 328 | info->si_overrun += timr->it_overrun_last; |
becf8b5d TG |
329 | } |
330 | ||
af888d67 | 331 | unlock_timer(timr, flags); |
1da177e4 LT |
332 | } |
333 | ||
ba661292 | 334 | int posix_timer_event(struct k_itimer *timr, int si_private) |
1da177e4 | 335 | { |
27af4245 ON |
336 | struct task_struct *task; |
337 | int shared, ret = -1; | |
ba661292 ON |
338 | /* |
339 | * FIXME: if ->sigq is queued we can race with | |
96fe3b07 | 340 | * dequeue_signal()->posixtimer_rearm(). |
ba661292 ON |
341 | * |
342 | * If dequeue_signal() sees the "right" value of | |
96fe3b07 | 343 | * si_sys_private it calls posixtimer_rearm(). |
ba661292 | 344 | * We re-queue ->sigq and drop ->it_lock(). |
96fe3b07 | 345 | * posixtimer_rearm() locks the timer |
ba661292 ON |
346 | * and re-schedules it while ->sigq is pending. |
347 | * Not really bad, but not that we want. | |
348 | */ | |
1da177e4 | 349 | timr->sigq->info.si_sys_private = si_private; |
1da177e4 | 350 | |
27af4245 ON |
351 | rcu_read_lock(); |
352 | task = pid_task(timr->it_pid, PIDTYPE_PID); | |
353 | if (task) { | |
354 | shared = !(timr->it_sigev_notify & SIGEV_THREAD_ID); | |
355 | ret = send_sigqueue(timr->sigq, task, shared); | |
356 | } | |
357 | rcu_read_unlock(); | |
4aa73611 ON |
358 | /* If we failed to send the signal the timer stops. */ |
359 | return ret > 0; | |
1da177e4 | 360 | } |
1da177e4 LT |
361 | |
362 | /* | |
363 | * This function gets called when a POSIX.1b interval timer expires. It | |
364 | * is used as a callback from the kernel internal timer. The | |
365 | * run_timer_list code ALWAYS calls with interrupts on. | |
366 | ||
367 | * This code is for CLOCK_REALTIME* and CLOCK_MONOTONIC* timers. | |
368 | */ | |
c9cb2e3d | 369 | static enum hrtimer_restart posix_timer_fn(struct hrtimer *timer) |
1da177e4 | 370 | { |
05cfb614 | 371 | struct k_itimer *timr; |
1da177e4 | 372 | unsigned long flags; |
becf8b5d | 373 | int si_private = 0; |
c9cb2e3d | 374 | enum hrtimer_restart ret = HRTIMER_NORESTART; |
1da177e4 | 375 | |
05cfb614 | 376 | timr = container_of(timer, struct k_itimer, it.real.timer); |
1da177e4 | 377 | spin_lock_irqsave(&timr->it_lock, flags); |
1da177e4 | 378 | |
21e55c1f | 379 | timr->it_active = 0; |
80105cd0 | 380 | if (timr->it_interval != 0) |
becf8b5d | 381 | si_private = ++timr->it_requeue_pending; |
1da177e4 | 382 | |
becf8b5d TG |
383 | if (posix_timer_event(timr, si_private)) { |
384 | /* | |
385 | * signal was not sent because of sig_ignor | |
386 | * we will not get a call back to restart it AND | |
387 | * it should be restarted. | |
388 | */ | |
80105cd0 | 389 | if (timr->it_interval != 0) { |
58229a18 TG |
390 | ktime_t now = hrtimer_cb_get_time(timer); |
391 | ||
392 | /* | |
393 | * FIXME: What we really want, is to stop this | |
394 | * timer completely and restart it in case the | |
395 | * SIG_IGN is removed. This is a non trivial | |
396 | * change which involves sighand locking | |
397 | * (sigh !), which we don't want to do late in | |
398 | * the release cycle. | |
399 | * | |
400 | * For now we just let timers with an interval | |
401 | * less than a jiffie expire every jiffie to | |
402 | * avoid softirq starvation in case of SIG_IGN | |
403 | * and a very small interval, which would put | |
404 | * the timer right back on the softirq pending | |
405 | * list. By moving now ahead of time we trick | |
406 | * hrtimer_forward() to expire the timer | |
407 | * later, while we still maintain the overrun | |
408 | * accuracy, but have some inconsistency in | |
409 | * the timer_gettime() case. This is at least | |
410 | * better than a starved softirq. A more | |
411 | * complex fix which solves also another related | |
412 | * inconsistency is already in the pipeline. | |
413 | */ | |
414 | #ifdef CONFIG_HIGH_RES_TIMERS | |
415 | { | |
8b0e1953 | 416 | ktime_t kj = NSEC_PER_SEC / HZ; |
58229a18 | 417 | |
80105cd0 | 418 | if (timr->it_interval < kj) |
58229a18 TG |
419 | now = ktime_add(now, kj); |
420 | } | |
421 | #endif | |
4d672e7a | 422 | timr->it_overrun += (unsigned int) |
58229a18 | 423 | hrtimer_forward(timer, now, |
80105cd0 | 424 | timr->it_interval); |
becf8b5d | 425 | ret = HRTIMER_RESTART; |
a0a0c28c | 426 | ++timr->it_requeue_pending; |
21e55c1f | 427 | timr->it_active = 1; |
1da177e4 | 428 | } |
1da177e4 | 429 | } |
1da177e4 | 430 | |
becf8b5d TG |
431 | unlock_timer(timr, flags); |
432 | return ret; | |
433 | } | |
1da177e4 | 434 | |
27af4245 | 435 | static struct pid *good_sigevent(sigevent_t * event) |
1da177e4 LT |
436 | { |
437 | struct task_struct *rtn = current->group_leader; | |
438 | ||
cef31d9a TG |
439 | switch (event->sigev_notify) { |
440 | case SIGEV_SIGNAL | SIGEV_THREAD_ID: | |
441 | rtn = find_task_by_vpid(event->sigev_notify_thread_id); | |
442 | if (!rtn || !same_thread_group(rtn, current)) | |
443 | return NULL; | |
444 | /* FALLTHRU */ | |
445 | case SIGEV_SIGNAL: | |
446 | case SIGEV_THREAD: | |
447 | if (event->sigev_signo <= 0 || event->sigev_signo > SIGRTMAX) | |
448 | return NULL; | |
449 | /* FALLTHRU */ | |
450 | case SIGEV_NONE: | |
451 | return task_pid(rtn); | |
452 | default: | |
1da177e4 | 453 | return NULL; |
cef31d9a | 454 | } |
1da177e4 LT |
455 | } |
456 | ||
1da177e4 LT |
457 | static struct k_itimer * alloc_posix_timer(void) |
458 | { | |
459 | struct k_itimer *tmr; | |
c3762229 | 460 | tmr = kmem_cache_zalloc(posix_timers_cache, GFP_KERNEL); |
1da177e4 LT |
461 | if (!tmr) |
462 | return tmr; | |
1da177e4 LT |
463 | if (unlikely(!(tmr->sigq = sigqueue_alloc()))) { |
464 | kmem_cache_free(posix_timers_cache, tmr); | |
aa94fbd5 | 465 | return NULL; |
1da177e4 | 466 | } |
3b10db2b | 467 | clear_siginfo(&tmr->sigq->info); |
1da177e4 LT |
468 | return tmr; |
469 | } | |
470 | ||
8af08871 ED |
471 | static void k_itimer_rcu_free(struct rcu_head *head) |
472 | { | |
473 | struct k_itimer *tmr = container_of(head, struct k_itimer, it.rcu); | |
474 | ||
475 | kmem_cache_free(posix_timers_cache, tmr); | |
476 | } | |
477 | ||
1da177e4 LT |
478 | #define IT_ID_SET 1 |
479 | #define IT_ID_NOT_SET 0 | |
480 | static void release_posix_timer(struct k_itimer *tmr, int it_id_set) | |
481 | { | |
482 | if (it_id_set) { | |
483 | unsigned long flags; | |
5ed67f05 PE |
484 | spin_lock_irqsave(&hash_lock, flags); |
485 | hlist_del_rcu(&tmr->t_hash); | |
486 | spin_unlock_irqrestore(&hash_lock, flags); | |
1da177e4 | 487 | } |
89992102 | 488 | put_pid(tmr->it_pid); |
1da177e4 | 489 | sigqueue_free(tmr->sigq); |
8af08871 | 490 | call_rcu(&tmr->it.rcu, k_itimer_rcu_free); |
1da177e4 LT |
491 | } |
492 | ||
838394fb TG |
493 | static int common_timer_create(struct k_itimer *new_timer) |
494 | { | |
495 | hrtimer_init(&new_timer->it.real.timer, new_timer->it_clock, 0); | |
496 | return 0; | |
497 | } | |
498 | ||
1da177e4 | 499 | /* Create a POSIX.1b interval timer. */ |
2482097c AV |
500 | static int do_timer_create(clockid_t which_clock, struct sigevent *event, |
501 | timer_t __user *created_timer_id) | |
1da177e4 | 502 | { |
d3ba5a9a | 503 | const struct k_clock *kc = clockid_to_kclock(which_clock); |
2cd499e3 | 504 | struct k_itimer *new_timer; |
ef864c95 | 505 | int error, new_timer_id; |
1da177e4 LT |
506 | int it_id_set = IT_ID_NOT_SET; |
507 | ||
838394fb | 508 | if (!kc) |
1da177e4 | 509 | return -EINVAL; |
838394fb TG |
510 | if (!kc->timer_create) |
511 | return -EOPNOTSUPP; | |
1da177e4 LT |
512 | |
513 | new_timer = alloc_posix_timer(); | |
514 | if (unlikely(!new_timer)) | |
515 | return -EAGAIN; | |
516 | ||
517 | spin_lock_init(&new_timer->it_lock); | |
5ed67f05 PE |
518 | new_timer_id = posix_timer_add(new_timer); |
519 | if (new_timer_id < 0) { | |
520 | error = new_timer_id; | |
1da177e4 LT |
521 | goto out; |
522 | } | |
523 | ||
524 | it_id_set = IT_ID_SET; | |
525 | new_timer->it_id = (timer_t) new_timer_id; | |
526 | new_timer->it_clock = which_clock; | |
d97bb75d | 527 | new_timer->kclock = kc; |
1da177e4 | 528 | new_timer->it_overrun = -1; |
1da177e4 | 529 | |
2482097c | 530 | if (event) { |
36b2f046 | 531 | rcu_read_lock(); |
2482097c | 532 | new_timer->it_pid = get_pid(good_sigevent(event)); |
36b2f046 | 533 | rcu_read_unlock(); |
89992102 | 534 | if (!new_timer->it_pid) { |
1da177e4 LT |
535 | error = -EINVAL; |
536 | goto out; | |
537 | } | |
2482097c AV |
538 | new_timer->it_sigev_notify = event->sigev_notify; |
539 | new_timer->sigq->info.si_signo = event->sigev_signo; | |
540 | new_timer->sigq->info.si_value = event->sigev_value; | |
1da177e4 | 541 | } else { |
2482097c AV |
542 | new_timer->it_sigev_notify = SIGEV_SIGNAL; |
543 | new_timer->sigq->info.si_signo = SIGALRM; | |
544 | memset(&new_timer->sigq->info.si_value, 0, sizeof(sigval_t)); | |
545 | new_timer->sigq->info.si_value.sival_int = new_timer->it_id; | |
89992102 | 546 | new_timer->it_pid = get_pid(task_tgid(current)); |
1da177e4 LT |
547 | } |
548 | ||
717835d9 | 549 | new_timer->sigq->info.si_tid = new_timer->it_id; |
5a9fa730 | 550 | new_timer->sigq->info.si_code = SI_TIMER; |
717835d9 | 551 | |
2b08de00 AV |
552 | if (copy_to_user(created_timer_id, |
553 | &new_timer_id, sizeof (new_timer_id))) { | |
554 | error = -EFAULT; | |
555 | goto out; | |
556 | } | |
557 | ||
838394fb | 558 | error = kc->timer_create(new_timer); |
45e0fffc AV |
559 | if (error) |
560 | goto out; | |
561 | ||
36b2f046 | 562 | spin_lock_irq(¤t->sighand->siglock); |
27af4245 | 563 | new_timer->it_signal = current->signal; |
36b2f046 ON |
564 | list_add(&new_timer->list, ¤t->signal->posix_timers); |
565 | spin_unlock_irq(¤t->sighand->siglock); | |
ef864c95 ON |
566 | |
567 | return 0; | |
838394fb | 568 | /* |
1da177e4 LT |
569 | * In the case of the timer belonging to another task, after |
570 | * the task is unlocked, the timer is owned by the other task | |
571 | * and may cease to exist at any time. Don't use or modify | |
572 | * new_timer after the unlock call. | |
573 | */ | |
1da177e4 | 574 | out: |
ef864c95 | 575 | release_posix_timer(new_timer, it_id_set); |
1da177e4 LT |
576 | return error; |
577 | } | |
578 | ||
2482097c AV |
579 | SYSCALL_DEFINE3(timer_create, const clockid_t, which_clock, |
580 | struct sigevent __user *, timer_event_spec, | |
581 | timer_t __user *, created_timer_id) | |
582 | { | |
583 | if (timer_event_spec) { | |
584 | sigevent_t event; | |
585 | ||
586 | if (copy_from_user(&event, timer_event_spec, sizeof (event))) | |
587 | return -EFAULT; | |
588 | return do_timer_create(which_clock, &event, created_timer_id); | |
589 | } | |
590 | return do_timer_create(which_clock, NULL, created_timer_id); | |
591 | } | |
592 | ||
593 | #ifdef CONFIG_COMPAT | |
594 | COMPAT_SYSCALL_DEFINE3(timer_create, clockid_t, which_clock, | |
595 | struct compat_sigevent __user *, timer_event_spec, | |
596 | timer_t __user *, created_timer_id) | |
597 | { | |
598 | if (timer_event_spec) { | |
599 | sigevent_t event; | |
600 | ||
601 | if (get_compat_sigevent(&event, timer_event_spec)) | |
602 | return -EFAULT; | |
603 | return do_timer_create(which_clock, &event, created_timer_id); | |
604 | } | |
605 | return do_timer_create(which_clock, NULL, created_timer_id); | |
606 | } | |
607 | #endif | |
608 | ||
1da177e4 LT |
609 | /* |
610 | * Locking issues: We need to protect the result of the id look up until | |
611 | * we get the timer locked down so it is not deleted under us. The | |
612 | * removal is done under the idr spinlock so we use that here to bridge | |
613 | * the find to the timer lock. To avoid a dead lock, the timer id MUST | |
614 | * be release with out holding the timer lock. | |
615 | */ | |
20f33a03 | 616 | static struct k_itimer *__lock_timer(timer_t timer_id, unsigned long *flags) |
1da177e4 LT |
617 | { |
618 | struct k_itimer *timr; | |
8af08871 | 619 | |
e182bb38 TH |
620 | /* |
621 | * timer_t could be any type >= int and we want to make sure any | |
622 | * @timer_id outside positive int range fails lookup. | |
623 | */ | |
624 | if ((unsigned long long)timer_id > INT_MAX) | |
625 | return NULL; | |
626 | ||
8af08871 | 627 | rcu_read_lock(); |
5ed67f05 | 628 | timr = posix_timer_by_id(timer_id); |
1da177e4 | 629 | if (timr) { |
8af08871 | 630 | spin_lock_irqsave(&timr->it_lock, *flags); |
89992102 | 631 | if (timr->it_signal == current->signal) { |
8af08871 | 632 | rcu_read_unlock(); |
31d92845 ON |
633 | return timr; |
634 | } | |
8af08871 | 635 | spin_unlock_irqrestore(&timr->it_lock, *flags); |
31d92845 | 636 | } |
8af08871 | 637 | rcu_read_unlock(); |
1da177e4 | 638 | |
31d92845 | 639 | return NULL; |
1da177e4 LT |
640 | } |
641 | ||
91d57bae TG |
642 | static ktime_t common_hrtimer_remaining(struct k_itimer *timr, ktime_t now) |
643 | { | |
644 | struct hrtimer *timer = &timr->it.real.timer; | |
645 | ||
646 | return __hrtimer_expires_remaining_adjusted(timer, now); | |
647 | } | |
648 | ||
649 | static int common_hrtimer_forward(struct k_itimer *timr, ktime_t now) | |
650 | { | |
651 | struct hrtimer *timer = &timr->it.real.timer; | |
652 | ||
653 | return (int)hrtimer_forward(timer, now, timr->it_interval); | |
654 | } | |
655 | ||
1da177e4 LT |
656 | /* |
657 | * Get the time remaining on a POSIX.1b interval timer. This function | |
658 | * is ALWAYS called with spin_lock_irq on the timer, thus it must not | |
659 | * mess with irq. | |
660 | * | |
661 | * We have a couple of messes to clean up here. First there is the case | |
662 | * of a timer that has a requeue pending. These timers should appear to | |
663 | * be in the timer list with an expiry as if we were to requeue them | |
664 | * now. | |
665 | * | |
666 | * The second issue is the SIGEV_NONE timer which may be active but is | |
667 | * not really ever put in the timer list (to save system resources). | |
668 | * This timer may be expired, and if so, we will do it here. Otherwise | |
669 | * it is the same as a requeue pending timer WRT to what we should | |
670 | * report. | |
671 | */ | |
f2c45807 | 672 | void common_timer_get(struct k_itimer *timr, struct itimerspec64 *cur_setting) |
1da177e4 | 673 | { |
91d57bae | 674 | const struct k_clock *kc = timr->kclock; |
3b98a532 | 675 | ktime_t now, remaining, iv; |
91d57bae TG |
676 | struct timespec64 ts64; |
677 | bool sig_none; | |
1da177e4 | 678 | |
cef31d9a | 679 | sig_none = timr->it_sigev_notify == SIGEV_NONE; |
80105cd0 | 680 | iv = timr->it_interval; |
3b98a532 | 681 | |
becf8b5d | 682 | /* interval timer ? */ |
91d57bae | 683 | if (iv) { |
5f252b32 | 684 | cur_setting->it_interval = ktime_to_timespec64(iv); |
91d57bae TG |
685 | } else if (!timr->it_active) { |
686 | /* | |
687 | * SIGEV_NONE oneshot timers are never queued. Check them | |
688 | * below. | |
689 | */ | |
690 | if (!sig_none) | |
691 | return; | |
692 | } | |
3b98a532 | 693 | |
91d57bae TG |
694 | /* |
695 | * The timespec64 based conversion is suboptimal, but it's not | |
696 | * worth to implement yet another callback. | |
697 | */ | |
698 | kc->clock_get(timr->it_clock, &ts64); | |
699 | now = timespec64_to_ktime(ts64); | |
3b98a532 | 700 | |
becf8b5d | 701 | /* |
91d57bae TG |
702 | * When a requeue is pending or this is a SIGEV_NONE timer move the |
703 | * expiry time forward by intervals, so expiry is > now. | |
becf8b5d | 704 | */ |
91d57bae TG |
705 | if (iv && (timr->it_requeue_pending & REQUEUE_PENDING || sig_none)) |
706 | timr->it_overrun += kc->timer_forward(timr, now); | |
3b98a532 | 707 | |
91d57bae | 708 | remaining = kc->timer_remaining(timr, now); |
becf8b5d | 709 | /* Return 0 only, when the timer is expired and not pending */ |
2456e855 | 710 | if (remaining <= 0) { |
3b98a532 RZ |
711 | /* |
712 | * A single shot SIGEV_NONE timer must return 0, when | |
713 | * it is expired ! | |
714 | */ | |
91d57bae | 715 | if (!sig_none) |
3b98a532 | 716 | cur_setting->it_value.tv_nsec = 1; |
91d57bae | 717 | } else { |
5f252b32 | 718 | cur_setting->it_value = ktime_to_timespec64(remaining); |
91d57bae | 719 | } |
1da177e4 LT |
720 | } |
721 | ||
722 | /* Get the time remaining on a POSIX.1b interval timer. */ | |
b0dc1242 | 723 | static int do_timer_gettime(timer_t timer_id, struct itimerspec64 *setting) |
1da177e4 | 724 | { |
a7319fa2 | 725 | struct k_itimer *timr; |
d3ba5a9a | 726 | const struct k_clock *kc; |
1da177e4 | 727 | unsigned long flags; |
a7319fa2 | 728 | int ret = 0; |
1da177e4 LT |
729 | |
730 | timr = lock_timer(timer_id, &flags); | |
731 | if (!timr) | |
732 | return -EINVAL; | |
733 | ||
b0dc1242 | 734 | memset(setting, 0, sizeof(*setting)); |
d97bb75d | 735 | kc = timr->kclock; |
a7319fa2 TG |
736 | if (WARN_ON_ONCE(!kc || !kc->timer_get)) |
737 | ret = -EINVAL; | |
738 | else | |
b0dc1242 | 739 | kc->timer_get(timr, setting); |
1da177e4 LT |
740 | |
741 | unlock_timer(timr, flags); | |
b0dc1242 AV |
742 | return ret; |
743 | } | |
1da177e4 | 744 | |
b0dc1242 AV |
745 | /* Get the time remaining on a POSIX.1b interval timer. */ |
746 | SYSCALL_DEFINE2(timer_gettime, timer_t, timer_id, | |
747 | struct itimerspec __user *, setting) | |
748 | { | |
725816e8 | 749 | struct itimerspec64 cur_setting; |
1da177e4 | 750 | |
725816e8 | 751 | int ret = do_timer_gettime(timer_id, &cur_setting); |
b0dc1242 | 752 | if (!ret) { |
725816e8 | 753 | if (put_itimerspec64(&cur_setting, setting)) |
b0dc1242 AV |
754 | ret = -EFAULT; |
755 | } | |
a7319fa2 | 756 | return ret; |
1da177e4 | 757 | } |
becf8b5d | 758 | |
b0dc1242 AV |
759 | #ifdef CONFIG_COMPAT |
760 | COMPAT_SYSCALL_DEFINE2(timer_gettime, timer_t, timer_id, | |
761 | struct compat_itimerspec __user *, setting) | |
762 | { | |
725816e8 | 763 | struct itimerspec64 cur_setting; |
b0dc1242 | 764 | |
725816e8 | 765 | int ret = do_timer_gettime(timer_id, &cur_setting); |
b0dc1242 | 766 | if (!ret) { |
725816e8 | 767 | if (put_compat_itimerspec64(&cur_setting, setting)) |
b0dc1242 AV |
768 | ret = -EFAULT; |
769 | } | |
770 | return ret; | |
771 | } | |
772 | #endif | |
773 | ||
1da177e4 LT |
774 | /* |
775 | * Get the number of overruns of a POSIX.1b interval timer. This is to | |
776 | * be the overrun of the timer last delivered. At the same time we are | |
777 | * accumulating overruns on the next timer. The overrun is frozen when | |
778 | * the signal is delivered, either at the notify time (if the info block | |
779 | * is not queued) or at the actual delivery time (as we are informed by | |
96fe3b07 | 780 | * the call back to posixtimer_rearm(). So all we need to do is |
1da177e4 LT |
781 | * to pick up the frozen overrun. |
782 | */ | |
362e9c07 | 783 | SYSCALL_DEFINE1(timer_getoverrun, timer_t, timer_id) |
1da177e4 LT |
784 | { |
785 | struct k_itimer *timr; | |
786 | int overrun; | |
5ba25331 | 787 | unsigned long flags; |
1da177e4 LT |
788 | |
789 | timr = lock_timer(timer_id, &flags); | |
790 | if (!timr) | |
791 | return -EINVAL; | |
792 | ||
793 | overrun = timr->it_overrun_last; | |
794 | unlock_timer(timr, flags); | |
795 | ||
796 | return overrun; | |
797 | } | |
1da177e4 | 798 | |
eae1c4ae TG |
799 | static void common_hrtimer_arm(struct k_itimer *timr, ktime_t expires, |
800 | bool absolute, bool sigev_none) | |
801 | { | |
802 | struct hrtimer *timer = &timr->it.real.timer; | |
803 | enum hrtimer_mode mode; | |
804 | ||
805 | mode = absolute ? HRTIMER_MODE_ABS : HRTIMER_MODE_REL; | |
67edab48 TG |
806 | /* |
807 | * Posix magic: Relative CLOCK_REALTIME timers are not affected by | |
808 | * clock modifications, so they become CLOCK_MONOTONIC based under the | |
809 | * hood. See hrtimer_init(). Update timr->kclock, so the generic | |
810 | * functions which use timr->kclock->clock_get() work. | |
811 | * | |
812 | * Note: it_clock stays unmodified, because the next timer_set() might | |
813 | * use ABSTIME, so it needs to switch back. | |
814 | */ | |
815 | if (timr->it_clock == CLOCK_REALTIME) | |
816 | timr->kclock = absolute ? &clock_realtime : &clock_monotonic; | |
817 | ||
eae1c4ae TG |
818 | hrtimer_init(&timr->it.real.timer, timr->it_clock, mode); |
819 | timr->it.real.timer.function = posix_timer_fn; | |
820 | ||
821 | if (!absolute) | |
822 | expires = ktime_add_safe(expires, timer->base->get_time()); | |
823 | hrtimer_set_expires(timer, expires); | |
824 | ||
825 | if (!sigev_none) | |
826 | hrtimer_start_expires(timer, HRTIMER_MODE_ABS); | |
827 | } | |
828 | ||
829 | static int common_hrtimer_try_to_cancel(struct k_itimer *timr) | |
830 | { | |
831 | return hrtimer_try_to_cancel(&timr->it.real.timer); | |
832 | } | |
833 | ||
1da177e4 | 834 | /* Set a POSIX.1b interval timer. */ |
f2c45807 TG |
835 | int common_timer_set(struct k_itimer *timr, int flags, |
836 | struct itimerspec64 *new_setting, | |
837 | struct itimerspec64 *old_setting) | |
1da177e4 | 838 | { |
eae1c4ae TG |
839 | const struct k_clock *kc = timr->kclock; |
840 | bool sigev_none; | |
841 | ktime_t expires; | |
1da177e4 LT |
842 | |
843 | if (old_setting) | |
844 | common_timer_get(timr, old_setting); | |
845 | ||
eae1c4ae | 846 | /* Prevent rearming by clearing the interval */ |
80105cd0 | 847 | timr->it_interval = 0; |
1da177e4 | 848 | /* |
eae1c4ae TG |
849 | * Careful here. On SMP systems the timer expiry function could be |
850 | * active and spinning on timr->it_lock. | |
1da177e4 | 851 | */ |
eae1c4ae | 852 | if (kc->timer_try_to_cancel(timr) < 0) |
1da177e4 | 853 | return TIMER_RETRY; |
1da177e4 | 854 | |
21e55c1f TG |
855 | timr->it_active = 0; |
856 | timr->it_requeue_pending = (timr->it_requeue_pending + 2) & | |
1da177e4 LT |
857 | ~REQUEUE_PENDING; |
858 | timr->it_overrun_last = 0; | |
1da177e4 | 859 | |
eae1c4ae | 860 | /* Switch off the timer when it_value is zero */ |
becf8b5d TG |
861 | if (!new_setting->it_value.tv_sec && !new_setting->it_value.tv_nsec) |
862 | return 0; | |
1da177e4 | 863 | |
80105cd0 | 864 | timr->it_interval = timespec64_to_ktime(new_setting->it_interval); |
eae1c4ae | 865 | expires = timespec64_to_ktime(new_setting->it_value); |
cef31d9a | 866 | sigev_none = timr->it_sigev_notify == SIGEV_NONE; |
becf8b5d | 867 | |
eae1c4ae TG |
868 | kc->timer_arm(timr, expires, flags & TIMER_ABSTIME, sigev_none); |
869 | timr->it_active = !sigev_none; | |
1da177e4 LT |
870 | return 0; |
871 | } | |
872 | ||
1acbe770 AV |
873 | static int do_timer_settime(timer_t timer_id, int flags, |
874 | struct itimerspec64 *new_spec64, | |
875 | struct itimerspec64 *old_spec64) | |
1da177e4 | 876 | { |
1acbe770 | 877 | const struct k_clock *kc; |
5f252b32 | 878 | struct k_itimer *timr; |
5ba25331 | 879 | unsigned long flag; |
5f252b32 | 880 | int error = 0; |
1da177e4 | 881 | |
1acbe770 AV |
882 | if (!timespec64_valid(&new_spec64->it_interval) || |
883 | !timespec64_valid(&new_spec64->it_value)) | |
1da177e4 LT |
884 | return -EINVAL; |
885 | ||
1acbe770 AV |
886 | if (old_spec64) |
887 | memset(old_spec64, 0, sizeof(*old_spec64)); | |
1da177e4 LT |
888 | retry: |
889 | timr = lock_timer(timer_id, &flag); | |
890 | if (!timr) | |
891 | return -EINVAL; | |
892 | ||
d97bb75d | 893 | kc = timr->kclock; |
27722df1 TG |
894 | if (WARN_ON_ONCE(!kc || !kc->timer_set)) |
895 | error = -EINVAL; | |
896 | else | |
1acbe770 | 897 | error = kc->timer_set(timr, flags, new_spec64, old_spec64); |
1da177e4 LT |
898 | |
899 | unlock_timer(timr, flag); | |
900 | if (error == TIMER_RETRY) { | |
1acbe770 | 901 | old_spec64 = NULL; // We already got the old time... |
1da177e4 LT |
902 | goto retry; |
903 | } | |
904 | ||
1acbe770 AV |
905 | return error; |
906 | } | |
1da177e4 | 907 | |
1acbe770 AV |
908 | /* Set a POSIX.1b interval timer */ |
909 | SYSCALL_DEFINE4(timer_settime, timer_t, timer_id, int, flags, | |
910 | const struct itimerspec __user *, new_setting, | |
911 | struct itimerspec __user *, old_setting) | |
912 | { | |
725816e8 DD |
913 | struct itimerspec64 new_spec, old_spec; |
914 | struct itimerspec64 *rtn = old_setting ? &old_spec : NULL; | |
1acbe770 AV |
915 | int error = 0; |
916 | ||
917 | if (!new_setting) | |
918 | return -EINVAL; | |
919 | ||
725816e8 | 920 | if (get_itimerspec64(&new_spec, new_setting)) |
1acbe770 | 921 | return -EFAULT; |
1acbe770 | 922 | |
725816e8 | 923 | error = do_timer_settime(timer_id, flags, &new_spec, rtn); |
1acbe770 | 924 | if (!error && old_setting) { |
725816e8 | 925 | if (put_itimerspec64(&old_spec, old_setting)) |
1acbe770 AV |
926 | error = -EFAULT; |
927 | } | |
928 | return error; | |
929 | } | |
930 | ||
931 | #ifdef CONFIG_COMPAT | |
932 | COMPAT_SYSCALL_DEFINE4(timer_settime, timer_t, timer_id, int, flags, | |
933 | struct compat_itimerspec __user *, new, | |
934 | struct compat_itimerspec __user *, old) | |
935 | { | |
725816e8 DD |
936 | struct itimerspec64 new_spec, old_spec; |
937 | struct itimerspec64 *rtn = old ? &old_spec : NULL; | |
1acbe770 AV |
938 | int error = 0; |
939 | ||
940 | if (!new) | |
941 | return -EINVAL; | |
725816e8 | 942 | if (get_compat_itimerspec64(&new_spec, new)) |
1acbe770 AV |
943 | return -EFAULT; |
944 | ||
725816e8 | 945 | error = do_timer_settime(timer_id, flags, &new_spec, rtn); |
1acbe770 | 946 | if (!error && old) { |
725816e8 | 947 | if (put_compat_itimerspec64(&old_spec, old)) |
1acbe770 AV |
948 | error = -EFAULT; |
949 | } | |
1da177e4 LT |
950 | return error; |
951 | } | |
1acbe770 | 952 | #endif |
1da177e4 | 953 | |
f2c45807 | 954 | int common_timer_del(struct k_itimer *timer) |
1da177e4 | 955 | { |
eae1c4ae | 956 | const struct k_clock *kc = timer->kclock; |
f972be33 | 957 | |
eae1c4ae TG |
958 | timer->it_interval = 0; |
959 | if (kc->timer_try_to_cancel(timer) < 0) | |
1da177e4 | 960 | return TIMER_RETRY; |
21e55c1f | 961 | timer->it_active = 0; |
1da177e4 LT |
962 | return 0; |
963 | } | |
964 | ||
965 | static inline int timer_delete_hook(struct k_itimer *timer) | |
966 | { | |
d97bb75d | 967 | const struct k_clock *kc = timer->kclock; |
6761c670 TG |
968 | |
969 | if (WARN_ON_ONCE(!kc || !kc->timer_del)) | |
970 | return -EINVAL; | |
971 | return kc->timer_del(timer); | |
1da177e4 LT |
972 | } |
973 | ||
974 | /* Delete a POSIX.1b interval timer. */ | |
362e9c07 | 975 | SYSCALL_DEFINE1(timer_delete, timer_t, timer_id) |
1da177e4 LT |
976 | { |
977 | struct k_itimer *timer; | |
5ba25331 | 978 | unsigned long flags; |
1da177e4 | 979 | |
1da177e4 | 980 | retry_delete: |
1da177e4 LT |
981 | timer = lock_timer(timer_id, &flags); |
982 | if (!timer) | |
983 | return -EINVAL; | |
984 | ||
becf8b5d | 985 | if (timer_delete_hook(timer) == TIMER_RETRY) { |
1da177e4 LT |
986 | unlock_timer(timer, flags); |
987 | goto retry_delete; | |
988 | } | |
becf8b5d | 989 | |
1da177e4 LT |
990 | spin_lock(¤t->sighand->siglock); |
991 | list_del(&timer->list); | |
992 | spin_unlock(¤t->sighand->siglock); | |
993 | /* | |
994 | * This keeps any tasks waiting on the spin lock from thinking | |
995 | * they got something (see the lock code above). | |
996 | */ | |
89992102 | 997 | timer->it_signal = NULL; |
4b7a1304 | 998 | |
1da177e4 LT |
999 | unlock_timer(timer, flags); |
1000 | release_posix_timer(timer, IT_ID_SET); | |
1001 | return 0; | |
1002 | } | |
becf8b5d | 1003 | |
1da177e4 LT |
1004 | /* |
1005 | * return timer owned by the process, used by exit_itimers | |
1006 | */ | |
858119e1 | 1007 | static void itimer_delete(struct k_itimer *timer) |
1da177e4 LT |
1008 | { |
1009 | unsigned long flags; | |
1010 | ||
1da177e4 | 1011 | retry_delete: |
1da177e4 LT |
1012 | spin_lock_irqsave(&timer->it_lock, flags); |
1013 | ||
becf8b5d | 1014 | if (timer_delete_hook(timer) == TIMER_RETRY) { |
1da177e4 LT |
1015 | unlock_timer(timer, flags); |
1016 | goto retry_delete; | |
1017 | } | |
1da177e4 LT |
1018 | list_del(&timer->list); |
1019 | /* | |
1020 | * This keeps any tasks waiting on the spin lock from thinking | |
1021 | * they got something (see the lock code above). | |
1022 | */ | |
89992102 | 1023 | timer->it_signal = NULL; |
4b7a1304 | 1024 | |
1da177e4 LT |
1025 | unlock_timer(timer, flags); |
1026 | release_posix_timer(timer, IT_ID_SET); | |
1027 | } | |
1028 | ||
1029 | /* | |
25f407f0 | 1030 | * This is called by do_exit or de_thread, only when there are no more |
1da177e4 LT |
1031 | * references to the shared signal_struct. |
1032 | */ | |
1033 | void exit_itimers(struct signal_struct *sig) | |
1034 | { | |
1035 | struct k_itimer *tmr; | |
1036 | ||
1037 | while (!list_empty(&sig->posix_timers)) { | |
1038 | tmr = list_entry(sig->posix_timers.next, struct k_itimer, list); | |
1039 | itimer_delete(tmr); | |
1040 | } | |
1041 | } | |
1042 | ||
362e9c07 | 1043 | SYSCALL_DEFINE2(clock_settime, const clockid_t, which_clock, |
6d5b8413 | 1044 | const struct __kernel_timespec __user *, tp) |
1da177e4 | 1045 | { |
d3ba5a9a | 1046 | const struct k_clock *kc = clockid_to_kclock(which_clock); |
5c499410 | 1047 | struct timespec64 new_tp; |
1da177e4 | 1048 | |
26f9a479 | 1049 | if (!kc || !kc->clock_set) |
1da177e4 | 1050 | return -EINVAL; |
26f9a479 | 1051 | |
5c499410 | 1052 | if (get_timespec64(&new_tp, tp)) |
1da177e4 LT |
1053 | return -EFAULT; |
1054 | ||
5c499410 | 1055 | return kc->clock_set(which_clock, &new_tp); |
1da177e4 LT |
1056 | } |
1057 | ||
362e9c07 | 1058 | SYSCALL_DEFINE2(clock_gettime, const clockid_t, which_clock, |
6d5b8413 | 1059 | struct __kernel_timespec __user *, tp) |
1da177e4 | 1060 | { |
d3ba5a9a | 1061 | const struct k_clock *kc = clockid_to_kclock(which_clock); |
5c499410 | 1062 | struct timespec64 kernel_tp; |
1da177e4 LT |
1063 | int error; |
1064 | ||
42285777 | 1065 | if (!kc) |
1da177e4 | 1066 | return -EINVAL; |
42285777 | 1067 | |
5c499410 | 1068 | error = kc->clock_get(which_clock, &kernel_tp); |
42285777 | 1069 | |
5c499410 | 1070 | if (!error && put_timespec64(&kernel_tp, tp)) |
1da177e4 LT |
1071 | error = -EFAULT; |
1072 | ||
1073 | return error; | |
1da177e4 LT |
1074 | } |
1075 | ||
f1f1d5eb RC |
1076 | SYSCALL_DEFINE2(clock_adjtime, const clockid_t, which_clock, |
1077 | struct timex __user *, utx) | |
1078 | { | |
d3ba5a9a | 1079 | const struct k_clock *kc = clockid_to_kclock(which_clock); |
f1f1d5eb RC |
1080 | struct timex ktx; |
1081 | int err; | |
1082 | ||
1083 | if (!kc) | |
1084 | return -EINVAL; | |
1085 | if (!kc->clock_adj) | |
1086 | return -EOPNOTSUPP; | |
1087 | ||
1088 | if (copy_from_user(&ktx, utx, sizeof(ktx))) | |
1089 | return -EFAULT; | |
1090 | ||
1091 | err = kc->clock_adj(which_clock, &ktx); | |
1092 | ||
f0dbe81f | 1093 | if (err >= 0 && copy_to_user(utx, &ktx, sizeof(ktx))) |
f1f1d5eb RC |
1094 | return -EFAULT; |
1095 | ||
1096 | return err; | |
1097 | } | |
1098 | ||
d822cdcc | 1099 | SYSCALL_DEFINE2(clock_getres, const clockid_t, which_clock, |
6d5b8413 | 1100 | struct __kernel_timespec __user *, tp) |
d822cdcc AV |
1101 | { |
1102 | const struct k_clock *kc = clockid_to_kclock(which_clock); | |
5c499410 | 1103 | struct timespec64 rtn_tp; |
d822cdcc AV |
1104 | int error; |
1105 | ||
1106 | if (!kc) | |
1107 | return -EINVAL; | |
1108 | ||
5c499410 | 1109 | error = kc->clock_getres(which_clock, &rtn_tp); |
d822cdcc | 1110 | |
5c499410 | 1111 | if (!error && tp && put_timespec64(&rtn_tp, tp)) |
d822cdcc AV |
1112 | error = -EFAULT; |
1113 | ||
1114 | return error; | |
1115 | } | |
1116 | ||
b5793b0d | 1117 | #ifdef CONFIG_COMPAT_32BIT_TIME |
3a4d44b6 | 1118 | |
d822cdcc AV |
1119 | COMPAT_SYSCALL_DEFINE2(clock_settime, clockid_t, which_clock, |
1120 | struct compat_timespec __user *, tp) | |
1121 | { | |
1122 | const struct k_clock *kc = clockid_to_kclock(which_clock); | |
5c499410 | 1123 | struct timespec64 ts; |
d822cdcc AV |
1124 | |
1125 | if (!kc || !kc->clock_set) | |
1126 | return -EINVAL; | |
1127 | ||
5c499410 | 1128 | if (compat_get_timespec64(&ts, tp)) |
d822cdcc AV |
1129 | return -EFAULT; |
1130 | ||
5c499410 | 1131 | return kc->clock_set(which_clock, &ts); |
d822cdcc AV |
1132 | } |
1133 | ||
1134 | COMPAT_SYSCALL_DEFINE2(clock_gettime, clockid_t, which_clock, | |
1135 | struct compat_timespec __user *, tp) | |
1136 | { | |
1137 | const struct k_clock *kc = clockid_to_kclock(which_clock); | |
5c499410 DD |
1138 | struct timespec64 ts; |
1139 | int err; | |
d822cdcc AV |
1140 | |
1141 | if (!kc) | |
1142 | return -EINVAL; | |
1143 | ||
5c499410 | 1144 | err = kc->clock_get(which_clock, &ts); |
d822cdcc | 1145 | |
5c499410 DD |
1146 | if (!err && compat_put_timespec64(&ts, tp)) |
1147 | err = -EFAULT; | |
d822cdcc | 1148 | |
5c499410 | 1149 | return err; |
d822cdcc AV |
1150 | } |
1151 | ||
b5793b0d DD |
1152 | #endif |
1153 | ||
1154 | #ifdef CONFIG_COMPAT | |
1155 | ||
3a4d44b6 AV |
1156 | COMPAT_SYSCALL_DEFINE2(clock_adjtime, clockid_t, which_clock, |
1157 | struct compat_timex __user *, utp) | |
1158 | { | |
1159 | const struct k_clock *kc = clockid_to_kclock(which_clock); | |
1160 | struct timex ktx; | |
1161 | int err; | |
1162 | ||
1163 | if (!kc) | |
1164 | return -EINVAL; | |
1165 | if (!kc->clock_adj) | |
1166 | return -EOPNOTSUPP; | |
1167 | ||
1168 | err = compat_get_timex(&ktx, utp); | |
1169 | if (err) | |
1170 | return err; | |
1171 | ||
1172 | err = kc->clock_adj(which_clock, &ktx); | |
1173 | ||
1174 | if (err >= 0) | |
1175 | err = compat_put_timex(utp, &ktx); | |
1176 | ||
1177 | return err; | |
1178 | } | |
3a4d44b6 | 1179 | |
b5793b0d DD |
1180 | #endif |
1181 | ||
1182 | #ifdef CONFIG_COMPAT_32BIT_TIME | |
1183 | ||
d822cdcc AV |
1184 | COMPAT_SYSCALL_DEFINE2(clock_getres, clockid_t, which_clock, |
1185 | struct compat_timespec __user *, tp) | |
1da177e4 | 1186 | { |
d3ba5a9a | 1187 | const struct k_clock *kc = clockid_to_kclock(which_clock); |
5c499410 DD |
1188 | struct timespec64 ts; |
1189 | int err; | |
1da177e4 | 1190 | |
e5e542ee | 1191 | if (!kc) |
1da177e4 LT |
1192 | return -EINVAL; |
1193 | ||
5c499410 DD |
1194 | err = kc->clock_getres(which_clock, &ts); |
1195 | if (!err && tp && compat_put_timespec64(&ts, tp)) | |
1196 | return -EFAULT; | |
1da177e4 | 1197 | |
5c499410 | 1198 | return err; |
1da177e4 | 1199 | } |
5c499410 | 1200 | |
d822cdcc | 1201 | #endif |
1da177e4 | 1202 | |
97735f25 TG |
1203 | /* |
1204 | * nanosleep for monotonic and realtime clocks | |
1205 | */ | |
1206 | static int common_nsleep(const clockid_t which_clock, int flags, | |
938e7cf2 | 1207 | const struct timespec64 *rqtp) |
97735f25 | 1208 | { |
938e7cf2 | 1209 | return hrtimer_nanosleep(rqtp, flags & TIMER_ABSTIME ? |
080344b9 ON |
1210 | HRTIMER_MODE_ABS : HRTIMER_MODE_REL, |
1211 | which_clock); | |
97735f25 | 1212 | } |
1da177e4 | 1213 | |
362e9c07 HC |
1214 | SYSCALL_DEFINE4(clock_nanosleep, const clockid_t, which_clock, int, flags, |
1215 | const struct timespec __user *, rqtp, | |
1216 | struct timespec __user *, rmtp) | |
1da177e4 | 1217 | { |
d3ba5a9a | 1218 | const struct k_clock *kc = clockid_to_kclock(which_clock); |
c0edd7c9 | 1219 | struct timespec64 t; |
1da177e4 | 1220 | |
a5cd2880 | 1221 | if (!kc) |
1da177e4 | 1222 | return -EINVAL; |
a5cd2880 TG |
1223 | if (!kc->nsleep) |
1224 | return -ENANOSLEEP_NOTSUP; | |
1da177e4 | 1225 | |
c0edd7c9 | 1226 | if (get_timespec64(&t, rqtp)) |
1da177e4 LT |
1227 | return -EFAULT; |
1228 | ||
c0edd7c9 | 1229 | if (!timespec64_valid(&t)) |
1da177e4 | 1230 | return -EINVAL; |
99e6c0e6 AV |
1231 | if (flags & TIMER_ABSTIME) |
1232 | rmtp = NULL; | |
edbeda46 | 1233 | current->restart_block.nanosleep.type = rmtp ? TT_NATIVE : TT_NONE; |
99e6c0e6 | 1234 | current->restart_block.nanosleep.rmtp = rmtp; |
1da177e4 | 1235 | |
c0edd7c9 | 1236 | return kc->nsleep(which_clock, flags, &t); |
1da177e4 | 1237 | } |
1711ef38 | 1238 | |
b5793b0d DD |
1239 | #ifdef CONFIG_COMPAT_32BIT_TIME |
1240 | ||
edbeda46 AV |
1241 | COMPAT_SYSCALL_DEFINE4(clock_nanosleep, clockid_t, which_clock, int, flags, |
1242 | struct compat_timespec __user *, rqtp, | |
1243 | struct compat_timespec __user *, rmtp) | |
1711ef38 | 1244 | { |
d3ba5a9a | 1245 | const struct k_clock *kc = clockid_to_kclock(which_clock); |
c0edd7c9 | 1246 | struct timespec64 t; |
59bd5bc2 | 1247 | |
edbeda46 | 1248 | if (!kc) |
59bd5bc2 | 1249 | return -EINVAL; |
edbeda46 AV |
1250 | if (!kc->nsleep) |
1251 | return -ENANOSLEEP_NOTSUP; | |
1252 | ||
c0edd7c9 | 1253 | if (compat_get_timespec64(&t, rqtp)) |
edbeda46 | 1254 | return -EFAULT; |
1711ef38 | 1255 | |
c0edd7c9 | 1256 | if (!timespec64_valid(&t)) |
edbeda46 AV |
1257 | return -EINVAL; |
1258 | if (flags & TIMER_ABSTIME) | |
1259 | rmtp = NULL; | |
1260 | current->restart_block.nanosleep.type = rmtp ? TT_COMPAT : TT_NONE; | |
1261 | current->restart_block.nanosleep.compat_rmtp = rmtp; | |
1262 | ||
c0edd7c9 | 1263 | return kc->nsleep(which_clock, flags, &t); |
1711ef38 | 1264 | } |
b5793b0d | 1265 | |
edbeda46 | 1266 | #endif |
6631fa12 TG |
1267 | |
1268 | static const struct k_clock clock_realtime = { | |
eae1c4ae TG |
1269 | .clock_getres = posix_get_hrtimer_res, |
1270 | .clock_get = posix_clock_realtime_get, | |
1271 | .clock_set = posix_clock_realtime_set, | |
1272 | .clock_adj = posix_clock_realtime_adj, | |
1273 | .nsleep = common_nsleep, | |
eae1c4ae TG |
1274 | .timer_create = common_timer_create, |
1275 | .timer_set = common_timer_set, | |
1276 | .timer_get = common_timer_get, | |
1277 | .timer_del = common_timer_del, | |
1278 | .timer_rearm = common_hrtimer_rearm, | |
1279 | .timer_forward = common_hrtimer_forward, | |
1280 | .timer_remaining = common_hrtimer_remaining, | |
1281 | .timer_try_to_cancel = common_hrtimer_try_to_cancel, | |
1282 | .timer_arm = common_hrtimer_arm, | |
6631fa12 TG |
1283 | }; |
1284 | ||
1285 | static const struct k_clock clock_monotonic = { | |
eae1c4ae TG |
1286 | .clock_getres = posix_get_hrtimer_res, |
1287 | .clock_get = posix_ktime_get_ts, | |
1288 | .nsleep = common_nsleep, | |
eae1c4ae TG |
1289 | .timer_create = common_timer_create, |
1290 | .timer_set = common_timer_set, | |
1291 | .timer_get = common_timer_get, | |
1292 | .timer_del = common_timer_del, | |
1293 | .timer_rearm = common_hrtimer_rearm, | |
1294 | .timer_forward = common_hrtimer_forward, | |
1295 | .timer_remaining = common_hrtimer_remaining, | |
1296 | .timer_try_to_cancel = common_hrtimer_try_to_cancel, | |
1297 | .timer_arm = common_hrtimer_arm, | |
6631fa12 TG |
1298 | }; |
1299 | ||
1300 | static const struct k_clock clock_monotonic_raw = { | |
eae1c4ae TG |
1301 | .clock_getres = posix_get_hrtimer_res, |
1302 | .clock_get = posix_get_monotonic_raw, | |
6631fa12 TG |
1303 | }; |
1304 | ||
1305 | static const struct k_clock clock_realtime_coarse = { | |
eae1c4ae TG |
1306 | .clock_getres = posix_get_coarse_res, |
1307 | .clock_get = posix_get_realtime_coarse, | |
6631fa12 TG |
1308 | }; |
1309 | ||
1310 | static const struct k_clock clock_monotonic_coarse = { | |
eae1c4ae TG |
1311 | .clock_getres = posix_get_coarse_res, |
1312 | .clock_get = posix_get_monotonic_coarse, | |
6631fa12 TG |
1313 | }; |
1314 | ||
1315 | static const struct k_clock clock_tai = { | |
eae1c4ae TG |
1316 | .clock_getres = posix_get_hrtimer_res, |
1317 | .clock_get = posix_get_tai, | |
1318 | .nsleep = common_nsleep, | |
eae1c4ae TG |
1319 | .timer_create = common_timer_create, |
1320 | .timer_set = common_timer_set, | |
1321 | .timer_get = common_timer_get, | |
1322 | .timer_del = common_timer_del, | |
1323 | .timer_rearm = common_hrtimer_rearm, | |
1324 | .timer_forward = common_hrtimer_forward, | |
1325 | .timer_remaining = common_hrtimer_remaining, | |
1326 | .timer_try_to_cancel = common_hrtimer_try_to_cancel, | |
1327 | .timer_arm = common_hrtimer_arm, | |
6631fa12 TG |
1328 | }; |
1329 | ||
72199320 | 1330 | static const struct k_clock clock_monotonic_active = { |
eae1c4ae | 1331 | .clock_getres = posix_get_hrtimer_res, |
72199320 | 1332 | .clock_get = posix_get_monotonic_active, |
6631fa12 TG |
1333 | }; |
1334 | ||
1335 | static const struct k_clock * const posix_clocks[] = { | |
1336 | [CLOCK_REALTIME] = &clock_realtime, | |
1337 | [CLOCK_MONOTONIC] = &clock_monotonic, | |
1338 | [CLOCK_PROCESS_CPUTIME_ID] = &clock_process, | |
1339 | [CLOCK_THREAD_CPUTIME_ID] = &clock_thread, | |
1340 | [CLOCK_MONOTONIC_RAW] = &clock_monotonic_raw, | |
1341 | [CLOCK_REALTIME_COARSE] = &clock_realtime_coarse, | |
1342 | [CLOCK_MONOTONIC_COARSE] = &clock_monotonic_coarse, | |
7250a404 | 1343 | [CLOCK_BOOTTIME] = &clock_monotonic, |
6631fa12 TG |
1344 | [CLOCK_REALTIME_ALARM] = &alarm_clock, |
1345 | [CLOCK_BOOTTIME_ALARM] = &alarm_clock, | |
1346 | [CLOCK_TAI] = &clock_tai, | |
72199320 | 1347 | [CLOCK_MONOTONIC_ACTIVE] = &clock_monotonic_active, |
6631fa12 TG |
1348 | }; |
1349 | ||
1350 | static const struct k_clock *clockid_to_kclock(const clockid_t id) | |
1351 | { | |
19b558db TG |
1352 | clockid_t idx = id; |
1353 | ||
1354 | if (id < 0) { | |
6631fa12 TG |
1355 | return (id & CLOCKFD_MASK) == CLOCKFD ? |
1356 | &clock_posix_dynamic : &clock_posix_cpu; | |
19b558db | 1357 | } |
6631fa12 | 1358 | |
19b558db | 1359 | if (id >= ARRAY_SIZE(posix_clocks)) |
6631fa12 | 1360 | return NULL; |
19b558db TG |
1361 | |
1362 | return posix_clocks[array_index_nospec(idx, ARRAY_SIZE(posix_clocks))]; | |
6631fa12 | 1363 | } |