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1da177e4 | 1 | /* |
f30c2269 | 2 | * linux/kernel/posix-timers.c |
1da177e4 LT |
3 | * |
4 | * | |
5 | * 2002-10-15 Posix Clocks & timers | |
6 | * by George Anzinger george@mvista.com | |
7 | * | |
8 | * Copyright (C) 2002 2003 by MontaVista Software. | |
9 | * | |
10 | * 2004-06-01 Fix CLOCK_REALTIME clock/timer TIMER_ABSTIME bug. | |
11 | * Copyright (C) 2004 Boris Hu | |
12 | * | |
13 | * This program is free software; you can redistribute it and/or modify | |
14 | * it under the terms of the GNU General Public License as published by | |
15 | * the Free Software Foundation; either version 2 of the License, or (at | |
16 | * your option) any later version. | |
17 | * | |
18 | * This program is distributed in the hope that it will be useful, but | |
19 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
20 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
21 | * General Public License for more details. | |
22 | ||
23 | * You should have received a copy of the GNU General Public License | |
24 | * along with this program; if not, write to the Free Software | |
25 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
26 | * | |
27 | * MontaVista Software | 1237 East Arques Avenue | Sunnyvale | CA 94085 | USA | |
28 | */ | |
29 | ||
30 | /* These are all the functions necessary to implement | |
31 | * POSIX clocks & timers | |
32 | */ | |
33 | #include <linux/mm.h> | |
1da177e4 LT |
34 | #include <linux/interrupt.h> |
35 | #include <linux/slab.h> | |
36 | #include <linux/time.h> | |
97d1f15b | 37 | #include <linux/mutex.h> |
61855b6b | 38 | #include <linux/sched/task.h> |
1da177e4 | 39 | |
7c0f6ba6 | 40 | #include <linux/uaccess.h> |
1da177e4 LT |
41 | #include <linux/list.h> |
42 | #include <linux/init.h> | |
43 | #include <linux/compiler.h> | |
5ed67f05 | 44 | #include <linux/hash.h> |
0606f422 | 45 | #include <linux/posix-clock.h> |
1da177e4 LT |
46 | #include <linux/posix-timers.h> |
47 | #include <linux/syscalls.h> | |
48 | #include <linux/wait.h> | |
49 | #include <linux/workqueue.h> | |
9984de1a | 50 | #include <linux/export.h> |
5ed67f05 | 51 | #include <linux/hashtable.h> |
1da177e4 | 52 | |
8b094cd0 | 53 | #include "timekeeping.h" |
bab0aae9 | 54 | #include "posix-timers.h" |
8b094cd0 | 55 | |
1da177e4 | 56 | /* |
5ed67f05 PE |
57 | * Management arrays for POSIX timers. Timers are now kept in static hash table |
58 | * with 512 entries. | |
59 | * Timer ids are allocated by local routine, which selects proper hash head by | |
60 | * key, constructed from current->signal address and per signal struct counter. | |
61 | * This keeps timer ids unique per process, but now they can intersect between | |
62 | * processes. | |
1da177e4 LT |
63 | */ |
64 | ||
65 | /* | |
66 | * Lets keep our timers in a slab cache :-) | |
67 | */ | |
e18b890b | 68 | static struct kmem_cache *posix_timers_cache; |
5ed67f05 PE |
69 | |
70 | static DEFINE_HASHTABLE(posix_timers_hashtable, 9); | |
71 | static DEFINE_SPINLOCK(hash_lock); | |
1da177e4 | 72 | |
6631fa12 TG |
73 | static const struct k_clock * const posix_clocks[]; |
74 | static const struct k_clock *clockid_to_kclock(const clockid_t id); | |
67edab48 | 75 | static const struct k_clock clock_realtime, clock_monotonic; |
6631fa12 | 76 | |
1da177e4 LT |
77 | /* |
78 | * we assume that the new SIGEV_THREAD_ID shares no bits with the other | |
79 | * SIGEV values. Here we put out an error if this assumption fails. | |
80 | */ | |
81 | #if SIGEV_THREAD_ID != (SIGEV_THREAD_ID & \ | |
82 | ~(SIGEV_SIGNAL | SIGEV_NONE | SIGEV_THREAD)) | |
83 | #error "SIGEV_THREAD_ID must not share bit with other SIGEV values!" | |
84 | #endif | |
85 | ||
65da528d TG |
86 | /* |
87 | * parisc wants ENOTSUP instead of EOPNOTSUPP | |
88 | */ | |
89 | #ifndef ENOTSUP | |
90 | # define ENANOSLEEP_NOTSUP EOPNOTSUPP | |
91 | #else | |
92 | # define ENANOSLEEP_NOTSUP ENOTSUP | |
93 | #endif | |
1da177e4 LT |
94 | |
95 | /* | |
96 | * The timer ID is turned into a timer address by idr_find(). | |
97 | * Verifying a valid ID consists of: | |
98 | * | |
99 | * a) checking that idr_find() returns other than -1. | |
100 | * b) checking that the timer id matches the one in the timer itself. | |
101 | * c) that the timer owner is in the callers thread group. | |
102 | */ | |
103 | ||
104 | /* | |
105 | * CLOCKs: The POSIX standard calls for a couple of clocks and allows us | |
106 | * to implement others. This structure defines the various | |
0061748d | 107 | * clocks. |
1da177e4 LT |
108 | * |
109 | * RESOLUTION: Clock resolution is used to round up timer and interval | |
110 | * times, NOT to report clock times, which are reported with as | |
111 | * much resolution as the system can muster. In some cases this | |
112 | * resolution may depend on the underlying clock hardware and | |
113 | * may not be quantifiable until run time, and only then is the | |
114 | * necessary code is written. The standard says we should say | |
115 | * something about this issue in the documentation... | |
116 | * | |
0061748d RC |
117 | * FUNCTIONS: The CLOCKs structure defines possible functions to |
118 | * handle various clock functions. | |
1da177e4 | 119 | * |
0061748d RC |
120 | * The standard POSIX timer management code assumes the |
121 | * following: 1.) The k_itimer struct (sched.h) is used for | |
122 | * the timer. 2.) The list, it_lock, it_clock, it_id and | |
123 | * it_pid fields are not modified by timer code. | |
1da177e4 LT |
124 | * |
125 | * Permissions: It is assumed that the clock_settime() function defined | |
126 | * for each clock will take care of permission checks. Some | |
127 | * clocks may be set able by any user (i.e. local process | |
128 | * clocks) others not. Currently the only set able clock we | |
129 | * have is CLOCK_REALTIME and its high res counter part, both of | |
130 | * which we beg off on and pass to do_sys_settimeofday(). | |
131 | */ | |
20f33a03 NK |
132 | static struct k_itimer *__lock_timer(timer_t timer_id, unsigned long *flags); |
133 | ||
134 | #define lock_timer(tid, flags) \ | |
135 | ({ struct k_itimer *__timr; \ | |
136 | __cond_lock(&__timr->it_lock, __timr = __lock_timer(tid, flags)); \ | |
137 | __timr; \ | |
138 | }) | |
1da177e4 | 139 | |
5ed67f05 PE |
140 | static int hash(struct signal_struct *sig, unsigned int nr) |
141 | { | |
142 | return hash_32(hash32_ptr(sig) ^ nr, HASH_BITS(posix_timers_hashtable)); | |
143 | } | |
144 | ||
145 | static struct k_itimer *__posix_timers_find(struct hlist_head *head, | |
146 | struct signal_struct *sig, | |
147 | timer_t id) | |
148 | { | |
5ed67f05 PE |
149 | struct k_itimer *timer; |
150 | ||
151 | hlist_for_each_entry_rcu(timer, head, t_hash) { | |
152 | if ((timer->it_signal == sig) && (timer->it_id == id)) | |
153 | return timer; | |
154 | } | |
155 | return NULL; | |
156 | } | |
157 | ||
158 | static struct k_itimer *posix_timer_by_id(timer_t id) | |
159 | { | |
160 | struct signal_struct *sig = current->signal; | |
161 | struct hlist_head *head = &posix_timers_hashtable[hash(sig, id)]; | |
162 | ||
163 | return __posix_timers_find(head, sig, id); | |
164 | } | |
165 | ||
166 | static int posix_timer_add(struct k_itimer *timer) | |
167 | { | |
168 | struct signal_struct *sig = current->signal; | |
169 | int first_free_id = sig->posix_timer_id; | |
170 | struct hlist_head *head; | |
171 | int ret = -ENOENT; | |
172 | ||
173 | do { | |
174 | spin_lock(&hash_lock); | |
175 | head = &posix_timers_hashtable[hash(sig, sig->posix_timer_id)]; | |
176 | if (!__posix_timers_find(head, sig, sig->posix_timer_id)) { | |
177 | hlist_add_head_rcu(&timer->t_hash, head); | |
178 | ret = sig->posix_timer_id; | |
179 | } | |
180 | if (++sig->posix_timer_id < 0) | |
181 | sig->posix_timer_id = 0; | |
182 | if ((sig->posix_timer_id == first_free_id) && (ret == -ENOENT)) | |
183 | /* Loop over all possible ids completed */ | |
184 | ret = -EAGAIN; | |
185 | spin_unlock(&hash_lock); | |
186 | } while (ret == -ENOENT); | |
187 | return ret; | |
188 | } | |
189 | ||
1da177e4 LT |
190 | static inline void unlock_timer(struct k_itimer *timr, unsigned long flags) |
191 | { | |
192 | spin_unlock_irqrestore(&timr->it_lock, flags); | |
193 | } | |
194 | ||
42285777 | 195 | /* Get clock_realtime */ |
3c9c12f4 | 196 | static int posix_clock_realtime_get(clockid_t which_clock, struct timespec64 *tp) |
42285777 | 197 | { |
3c9c12f4 | 198 | ktime_get_real_ts64(tp); |
42285777 TG |
199 | return 0; |
200 | } | |
201 | ||
26f9a479 TG |
202 | /* Set clock_realtime */ |
203 | static int posix_clock_realtime_set(const clockid_t which_clock, | |
0fe6afe3 | 204 | const struct timespec64 *tp) |
26f9a479 | 205 | { |
0fe6afe3 | 206 | return do_sys_settimeofday64(tp, NULL); |
26f9a479 TG |
207 | } |
208 | ||
f1f1d5eb RC |
209 | static int posix_clock_realtime_adj(const clockid_t which_clock, |
210 | struct timex *t) | |
211 | { | |
212 | return do_adjtimex(t); | |
213 | } | |
214 | ||
becf8b5d TG |
215 | /* |
216 | * Get monotonic time for posix timers | |
217 | */ | |
3c9c12f4 | 218 | static int posix_ktime_get_ts(clockid_t which_clock, struct timespec64 *tp) |
becf8b5d | 219 | { |
3c9c12f4 | 220 | ktime_get_ts64(tp); |
becf8b5d TG |
221 | return 0; |
222 | } | |
1da177e4 | 223 | |
2d42244a | 224 | /* |
7fdd7f89 | 225 | * Get monotonic-raw time for posix timers |
2d42244a | 226 | */ |
3c9c12f4 | 227 | static int posix_get_monotonic_raw(clockid_t which_clock, struct timespec64 *tp) |
2d42244a | 228 | { |
3c9c12f4 | 229 | getrawmonotonic64(tp); |
2d42244a JS |
230 | return 0; |
231 | } | |
232 | ||
da15cfda | 233 | |
3c9c12f4 | 234 | static int posix_get_realtime_coarse(clockid_t which_clock, struct timespec64 *tp) |
da15cfda | 235 | { |
3c9c12f4 | 236 | *tp = current_kernel_time64(); |
da15cfda JS |
237 | return 0; |
238 | } | |
239 | ||
240 | static int posix_get_monotonic_coarse(clockid_t which_clock, | |
3c9c12f4 | 241 | struct timespec64 *tp) |
da15cfda | 242 | { |
3c9c12f4 | 243 | *tp = get_monotonic_coarse64(); |
da15cfda JS |
244 | return 0; |
245 | } | |
246 | ||
d2e3e0ca | 247 | static int posix_get_coarse_res(const clockid_t which_clock, struct timespec64 *tp) |
da15cfda | 248 | { |
d2e3e0ca | 249 | *tp = ktime_to_timespec64(KTIME_LOW_RES); |
da15cfda JS |
250 | return 0; |
251 | } | |
7fdd7f89 | 252 | |
3c9c12f4 | 253 | static int posix_get_boottime(const clockid_t which_clock, struct timespec64 *tp) |
7fdd7f89 | 254 | { |
3c9c12f4 | 255 | get_monotonic_boottime64(tp); |
7fdd7f89 JS |
256 | return 0; |
257 | } | |
258 | ||
3c9c12f4 | 259 | static int posix_get_tai(clockid_t which_clock, struct timespec64 *tp) |
1ff3c967 | 260 | { |
3c9c12f4 | 261 | timekeeping_clocktai64(tp); |
1ff3c967 JS |
262 | return 0; |
263 | } | |
7fdd7f89 | 264 | |
d2e3e0ca | 265 | static int posix_get_hrtimer_res(clockid_t which_clock, struct timespec64 *tp) |
056a3cac TG |
266 | { |
267 | tp->tv_sec = 0; | |
268 | tp->tv_nsec = hrtimer_resolution; | |
269 | return 0; | |
270 | } | |
271 | ||
1da177e4 LT |
272 | /* |
273 | * Initialize everything, well, just everything in Posix clocks/timers ;) | |
274 | */ | |
275 | static __init int init_posix_timers(void) | |
276 | { | |
1da177e4 | 277 | posix_timers_cache = kmem_cache_create("posix_timers_cache", |
040b5c6f AD |
278 | sizeof (struct k_itimer), 0, SLAB_PANIC, |
279 | NULL); | |
1da177e4 LT |
280 | return 0; |
281 | } | |
1da177e4 LT |
282 | __initcall(init_posix_timers); |
283 | ||
f37fb0aa | 284 | static void common_hrtimer_rearm(struct k_itimer *timr) |
1da177e4 | 285 | { |
44f21475 RZ |
286 | struct hrtimer *timer = &timr->it.real.timer; |
287 | ||
80105cd0 | 288 | if (!timr->it_interval) |
1da177e4 LT |
289 | return; |
290 | ||
4d672e7a DL |
291 | timr->it_overrun += (unsigned int) hrtimer_forward(timer, |
292 | timer->base->get_time(), | |
80105cd0 | 293 | timr->it_interval); |
44f21475 | 294 | hrtimer_restart(timer); |
1da177e4 LT |
295 | } |
296 | ||
297 | /* | |
298 | * This function is exported for use by the signal deliver code. It is | |
299 | * called just prior to the info block being released and passes that | |
300 | * block to us. It's function is to update the overrun entry AND to | |
301 | * restart the timer. It should only be called if the timer is to be | |
302 | * restarted (i.e. we have flagged this in the sys_private entry of the | |
303 | * info block). | |
304 | * | |
25985edc | 305 | * To protect against the timer going away while the interrupt is queued, |
1da177e4 LT |
306 | * we require that the it_requeue_pending flag be set. |
307 | */ | |
96fe3b07 | 308 | void posixtimer_rearm(struct siginfo *info) |
1da177e4 LT |
309 | { |
310 | struct k_itimer *timr; | |
311 | unsigned long flags; | |
312 | ||
313 | timr = lock_timer(info->si_tid, &flags); | |
af888d67 TG |
314 | if (!timr) |
315 | return; | |
1da177e4 | 316 | |
af888d67 | 317 | if (timr->it_requeue_pending == info->si_sys_private) { |
f37fb0aa | 318 | timr->kclock->timer_rearm(timr); |
1da177e4 | 319 | |
21e55c1f | 320 | timr->it_active = 1; |
af888d67 TG |
321 | timr->it_overrun_last = timr->it_overrun; |
322 | timr->it_overrun = -1; | |
323 | ++timr->it_requeue_pending; | |
324 | ||
54da1174 | 325 | info->si_overrun += timr->it_overrun_last; |
becf8b5d TG |
326 | } |
327 | ||
af888d67 | 328 | unlock_timer(timr, flags); |
1da177e4 LT |
329 | } |
330 | ||
ba661292 | 331 | int posix_timer_event(struct k_itimer *timr, int si_private) |
1da177e4 | 332 | { |
27af4245 ON |
333 | struct task_struct *task; |
334 | int shared, ret = -1; | |
ba661292 ON |
335 | /* |
336 | * FIXME: if ->sigq is queued we can race with | |
96fe3b07 | 337 | * dequeue_signal()->posixtimer_rearm(). |
ba661292 ON |
338 | * |
339 | * If dequeue_signal() sees the "right" value of | |
96fe3b07 | 340 | * si_sys_private it calls posixtimer_rearm(). |
ba661292 | 341 | * We re-queue ->sigq and drop ->it_lock(). |
96fe3b07 | 342 | * posixtimer_rearm() locks the timer |
ba661292 ON |
343 | * and re-schedules it while ->sigq is pending. |
344 | * Not really bad, but not that we want. | |
345 | */ | |
1da177e4 | 346 | timr->sigq->info.si_sys_private = si_private; |
1da177e4 | 347 | |
27af4245 ON |
348 | rcu_read_lock(); |
349 | task = pid_task(timr->it_pid, PIDTYPE_PID); | |
350 | if (task) { | |
351 | shared = !(timr->it_sigev_notify & SIGEV_THREAD_ID); | |
352 | ret = send_sigqueue(timr->sigq, task, shared); | |
353 | } | |
354 | rcu_read_unlock(); | |
4aa73611 ON |
355 | /* If we failed to send the signal the timer stops. */ |
356 | return ret > 0; | |
1da177e4 | 357 | } |
1da177e4 LT |
358 | |
359 | /* | |
360 | * This function gets called when a POSIX.1b interval timer expires. It | |
361 | * is used as a callback from the kernel internal timer. The | |
362 | * run_timer_list code ALWAYS calls with interrupts on. | |
363 | ||
364 | * This code is for CLOCK_REALTIME* and CLOCK_MONOTONIC* timers. | |
365 | */ | |
c9cb2e3d | 366 | static enum hrtimer_restart posix_timer_fn(struct hrtimer *timer) |
1da177e4 | 367 | { |
05cfb614 | 368 | struct k_itimer *timr; |
1da177e4 | 369 | unsigned long flags; |
becf8b5d | 370 | int si_private = 0; |
c9cb2e3d | 371 | enum hrtimer_restart ret = HRTIMER_NORESTART; |
1da177e4 | 372 | |
05cfb614 | 373 | timr = container_of(timer, struct k_itimer, it.real.timer); |
1da177e4 | 374 | spin_lock_irqsave(&timr->it_lock, flags); |
1da177e4 | 375 | |
21e55c1f | 376 | timr->it_active = 0; |
80105cd0 | 377 | if (timr->it_interval != 0) |
becf8b5d | 378 | si_private = ++timr->it_requeue_pending; |
1da177e4 | 379 | |
becf8b5d TG |
380 | if (posix_timer_event(timr, si_private)) { |
381 | /* | |
382 | * signal was not sent because of sig_ignor | |
383 | * we will not get a call back to restart it AND | |
384 | * it should be restarted. | |
385 | */ | |
80105cd0 | 386 | if (timr->it_interval != 0) { |
58229a18 TG |
387 | ktime_t now = hrtimer_cb_get_time(timer); |
388 | ||
389 | /* | |
390 | * FIXME: What we really want, is to stop this | |
391 | * timer completely and restart it in case the | |
392 | * SIG_IGN is removed. This is a non trivial | |
393 | * change which involves sighand locking | |
394 | * (sigh !), which we don't want to do late in | |
395 | * the release cycle. | |
396 | * | |
397 | * For now we just let timers with an interval | |
398 | * less than a jiffie expire every jiffie to | |
399 | * avoid softirq starvation in case of SIG_IGN | |
400 | * and a very small interval, which would put | |
401 | * the timer right back on the softirq pending | |
402 | * list. By moving now ahead of time we trick | |
403 | * hrtimer_forward() to expire the timer | |
404 | * later, while we still maintain the overrun | |
405 | * accuracy, but have some inconsistency in | |
406 | * the timer_gettime() case. This is at least | |
407 | * better than a starved softirq. A more | |
408 | * complex fix which solves also another related | |
409 | * inconsistency is already in the pipeline. | |
410 | */ | |
411 | #ifdef CONFIG_HIGH_RES_TIMERS | |
412 | { | |
8b0e1953 | 413 | ktime_t kj = NSEC_PER_SEC / HZ; |
58229a18 | 414 | |
80105cd0 | 415 | if (timr->it_interval < kj) |
58229a18 TG |
416 | now = ktime_add(now, kj); |
417 | } | |
418 | #endif | |
4d672e7a | 419 | timr->it_overrun += (unsigned int) |
58229a18 | 420 | hrtimer_forward(timer, now, |
80105cd0 | 421 | timr->it_interval); |
becf8b5d | 422 | ret = HRTIMER_RESTART; |
a0a0c28c | 423 | ++timr->it_requeue_pending; |
21e55c1f | 424 | timr->it_active = 1; |
1da177e4 | 425 | } |
1da177e4 | 426 | } |
1da177e4 | 427 | |
becf8b5d TG |
428 | unlock_timer(timr, flags); |
429 | return ret; | |
430 | } | |
1da177e4 | 431 | |
27af4245 | 432 | static struct pid *good_sigevent(sigevent_t * event) |
1da177e4 LT |
433 | { |
434 | struct task_struct *rtn = current->group_leader; | |
435 | ||
436 | if ((event->sigev_notify & SIGEV_THREAD_ID ) && | |
8dc86af0 | 437 | (!(rtn = find_task_by_vpid(event->sigev_notify_thread_id)) || |
bac0abd6 | 438 | !same_thread_group(rtn, current) || |
1da177e4 LT |
439 | (event->sigev_notify & ~SIGEV_THREAD_ID) != SIGEV_SIGNAL)) |
440 | return NULL; | |
441 | ||
442 | if (((event->sigev_notify & ~SIGEV_THREAD_ID) != SIGEV_NONE) && | |
443 | ((event->sigev_signo <= 0) || (event->sigev_signo > SIGRTMAX))) | |
444 | return NULL; | |
445 | ||
27af4245 | 446 | return task_pid(rtn); |
1da177e4 LT |
447 | } |
448 | ||
1da177e4 LT |
449 | static struct k_itimer * alloc_posix_timer(void) |
450 | { | |
451 | struct k_itimer *tmr; | |
c3762229 | 452 | tmr = kmem_cache_zalloc(posix_timers_cache, GFP_KERNEL); |
1da177e4 LT |
453 | if (!tmr) |
454 | return tmr; | |
1da177e4 LT |
455 | if (unlikely(!(tmr->sigq = sigqueue_alloc()))) { |
456 | kmem_cache_free(posix_timers_cache, tmr); | |
aa94fbd5 | 457 | return NULL; |
1da177e4 | 458 | } |
ba661292 | 459 | memset(&tmr->sigq->info, 0, sizeof(siginfo_t)); |
1da177e4 LT |
460 | return tmr; |
461 | } | |
462 | ||
8af08871 ED |
463 | static void k_itimer_rcu_free(struct rcu_head *head) |
464 | { | |
465 | struct k_itimer *tmr = container_of(head, struct k_itimer, it.rcu); | |
466 | ||
467 | kmem_cache_free(posix_timers_cache, tmr); | |
468 | } | |
469 | ||
1da177e4 LT |
470 | #define IT_ID_SET 1 |
471 | #define IT_ID_NOT_SET 0 | |
472 | static void release_posix_timer(struct k_itimer *tmr, int it_id_set) | |
473 | { | |
474 | if (it_id_set) { | |
475 | unsigned long flags; | |
5ed67f05 PE |
476 | spin_lock_irqsave(&hash_lock, flags); |
477 | hlist_del_rcu(&tmr->t_hash); | |
478 | spin_unlock_irqrestore(&hash_lock, flags); | |
1da177e4 | 479 | } |
89992102 | 480 | put_pid(tmr->it_pid); |
1da177e4 | 481 | sigqueue_free(tmr->sigq); |
8af08871 | 482 | call_rcu(&tmr->it.rcu, k_itimer_rcu_free); |
1da177e4 LT |
483 | } |
484 | ||
838394fb TG |
485 | static int common_timer_create(struct k_itimer *new_timer) |
486 | { | |
487 | hrtimer_init(&new_timer->it.real.timer, new_timer->it_clock, 0); | |
488 | return 0; | |
489 | } | |
490 | ||
1da177e4 LT |
491 | /* Create a POSIX.1b interval timer. */ |
492 | ||
362e9c07 HC |
493 | SYSCALL_DEFINE3(timer_create, const clockid_t, which_clock, |
494 | struct sigevent __user *, timer_event_spec, | |
495 | timer_t __user *, created_timer_id) | |
1da177e4 | 496 | { |
d3ba5a9a | 497 | const struct k_clock *kc = clockid_to_kclock(which_clock); |
2cd499e3 | 498 | struct k_itimer *new_timer; |
ef864c95 | 499 | int error, new_timer_id; |
1da177e4 LT |
500 | sigevent_t event; |
501 | int it_id_set = IT_ID_NOT_SET; | |
502 | ||
838394fb | 503 | if (!kc) |
1da177e4 | 504 | return -EINVAL; |
838394fb TG |
505 | if (!kc->timer_create) |
506 | return -EOPNOTSUPP; | |
1da177e4 LT |
507 | |
508 | new_timer = alloc_posix_timer(); | |
509 | if (unlikely(!new_timer)) | |
510 | return -EAGAIN; | |
511 | ||
512 | spin_lock_init(&new_timer->it_lock); | |
5ed67f05 PE |
513 | new_timer_id = posix_timer_add(new_timer); |
514 | if (new_timer_id < 0) { | |
515 | error = new_timer_id; | |
1da177e4 LT |
516 | goto out; |
517 | } | |
518 | ||
519 | it_id_set = IT_ID_SET; | |
520 | new_timer->it_id = (timer_t) new_timer_id; | |
521 | new_timer->it_clock = which_clock; | |
d97bb75d | 522 | new_timer->kclock = kc; |
1da177e4 | 523 | new_timer->it_overrun = -1; |
1da177e4 | 524 | |
1da177e4 LT |
525 | if (timer_event_spec) { |
526 | if (copy_from_user(&event, timer_event_spec, sizeof (event))) { | |
527 | error = -EFAULT; | |
528 | goto out; | |
529 | } | |
36b2f046 | 530 | rcu_read_lock(); |
89992102 | 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 | } | |
537 | } else { | |
6891c450 | 538 | memset(&event.sigev_value, 0, sizeof(event.sigev_value)); |
5a9fa730 ON |
539 | event.sigev_notify = SIGEV_SIGNAL; |
540 | event.sigev_signo = SIGALRM; | |
541 | event.sigev_value.sival_int = new_timer->it_id; | |
89992102 | 542 | new_timer->it_pid = get_pid(task_tgid(current)); |
1da177e4 LT |
543 | } |
544 | ||
5a9fa730 ON |
545 | new_timer->it_sigev_notify = event.sigev_notify; |
546 | new_timer->sigq->info.si_signo = event.sigev_signo; | |
547 | new_timer->sigq->info.si_value = event.sigev_value; | |
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 | ||
1da177e4 LT |
578 | /* |
579 | * Locking issues: We need to protect the result of the id look up until | |
580 | * we get the timer locked down so it is not deleted under us. The | |
581 | * removal is done under the idr spinlock so we use that here to bridge | |
582 | * the find to the timer lock. To avoid a dead lock, the timer id MUST | |
583 | * be release with out holding the timer lock. | |
584 | */ | |
20f33a03 | 585 | static struct k_itimer *__lock_timer(timer_t timer_id, unsigned long *flags) |
1da177e4 LT |
586 | { |
587 | struct k_itimer *timr; | |
8af08871 | 588 | |
e182bb38 TH |
589 | /* |
590 | * timer_t could be any type >= int and we want to make sure any | |
591 | * @timer_id outside positive int range fails lookup. | |
592 | */ | |
593 | if ((unsigned long long)timer_id > INT_MAX) | |
594 | return NULL; | |
595 | ||
8af08871 | 596 | rcu_read_lock(); |
5ed67f05 | 597 | timr = posix_timer_by_id(timer_id); |
1da177e4 | 598 | if (timr) { |
8af08871 | 599 | spin_lock_irqsave(&timr->it_lock, *flags); |
89992102 | 600 | if (timr->it_signal == current->signal) { |
8af08871 | 601 | rcu_read_unlock(); |
31d92845 ON |
602 | return timr; |
603 | } | |
8af08871 | 604 | spin_unlock_irqrestore(&timr->it_lock, *flags); |
31d92845 | 605 | } |
8af08871 | 606 | rcu_read_unlock(); |
1da177e4 | 607 | |
31d92845 | 608 | return NULL; |
1da177e4 LT |
609 | } |
610 | ||
91d57bae TG |
611 | static ktime_t common_hrtimer_remaining(struct k_itimer *timr, ktime_t now) |
612 | { | |
613 | struct hrtimer *timer = &timr->it.real.timer; | |
614 | ||
615 | return __hrtimer_expires_remaining_adjusted(timer, now); | |
616 | } | |
617 | ||
618 | static int common_hrtimer_forward(struct k_itimer *timr, ktime_t now) | |
619 | { | |
620 | struct hrtimer *timer = &timr->it.real.timer; | |
621 | ||
622 | return (int)hrtimer_forward(timer, now, timr->it_interval); | |
623 | } | |
624 | ||
1da177e4 LT |
625 | /* |
626 | * Get the time remaining on a POSIX.1b interval timer. This function | |
627 | * is ALWAYS called with spin_lock_irq on the timer, thus it must not | |
628 | * mess with irq. | |
629 | * | |
630 | * We have a couple of messes to clean up here. First there is the case | |
631 | * of a timer that has a requeue pending. These timers should appear to | |
632 | * be in the timer list with an expiry as if we were to requeue them | |
633 | * now. | |
634 | * | |
635 | * The second issue is the SIGEV_NONE timer which may be active but is | |
636 | * not really ever put in the timer list (to save system resources). | |
637 | * This timer may be expired, and if so, we will do it here. Otherwise | |
638 | * it is the same as a requeue pending timer WRT to what we should | |
639 | * report. | |
640 | */ | |
f2c45807 | 641 | void common_timer_get(struct k_itimer *timr, struct itimerspec64 *cur_setting) |
1da177e4 | 642 | { |
91d57bae | 643 | const struct k_clock *kc = timr->kclock; |
3b98a532 | 644 | ktime_t now, remaining, iv; |
91d57bae TG |
645 | struct timespec64 ts64; |
646 | bool sig_none; | |
1da177e4 | 647 | |
c6503be5 | 648 | sig_none = (timr->it_sigev_notify & ~SIGEV_THREAD_ID) == SIGEV_NONE; |
80105cd0 | 649 | iv = timr->it_interval; |
3b98a532 | 650 | |
becf8b5d | 651 | /* interval timer ? */ |
91d57bae | 652 | if (iv) { |
5f252b32 | 653 | cur_setting->it_interval = ktime_to_timespec64(iv); |
91d57bae TG |
654 | } else if (!timr->it_active) { |
655 | /* | |
656 | * SIGEV_NONE oneshot timers are never queued. Check them | |
657 | * below. | |
658 | */ | |
659 | if (!sig_none) | |
660 | return; | |
661 | } | |
3b98a532 | 662 | |
91d57bae TG |
663 | /* |
664 | * The timespec64 based conversion is suboptimal, but it's not | |
665 | * worth to implement yet another callback. | |
666 | */ | |
667 | kc->clock_get(timr->it_clock, &ts64); | |
668 | now = timespec64_to_ktime(ts64); | |
3b98a532 | 669 | |
becf8b5d | 670 | /* |
91d57bae TG |
671 | * When a requeue is pending or this is a SIGEV_NONE timer move the |
672 | * expiry time forward by intervals, so expiry is > now. | |
becf8b5d | 673 | */ |
91d57bae TG |
674 | if (iv && (timr->it_requeue_pending & REQUEUE_PENDING || sig_none)) |
675 | timr->it_overrun += kc->timer_forward(timr, now); | |
3b98a532 | 676 | |
91d57bae | 677 | remaining = kc->timer_remaining(timr, now); |
becf8b5d | 678 | /* Return 0 only, when the timer is expired and not pending */ |
2456e855 | 679 | if (remaining <= 0) { |
3b98a532 RZ |
680 | /* |
681 | * A single shot SIGEV_NONE timer must return 0, when | |
682 | * it is expired ! | |
683 | */ | |
91d57bae | 684 | if (!sig_none) |
3b98a532 | 685 | cur_setting->it_value.tv_nsec = 1; |
91d57bae | 686 | } else { |
5f252b32 | 687 | cur_setting->it_value = ktime_to_timespec64(remaining); |
91d57bae | 688 | } |
1da177e4 LT |
689 | } |
690 | ||
691 | /* Get the time remaining on a POSIX.1b interval timer. */ | |
362e9c07 HC |
692 | SYSCALL_DEFINE2(timer_gettime, timer_t, timer_id, |
693 | struct itimerspec __user *, setting) | |
1da177e4 | 694 | { |
5f252b32 | 695 | struct itimerspec64 cur_setting64; |
1da177e4 | 696 | struct itimerspec cur_setting; |
a7319fa2 | 697 | struct k_itimer *timr; |
d3ba5a9a | 698 | const struct k_clock *kc; |
1da177e4 | 699 | unsigned long flags; |
a7319fa2 | 700 | int ret = 0; |
1da177e4 LT |
701 | |
702 | timr = lock_timer(timer_id, &flags); | |
703 | if (!timr) | |
704 | return -EINVAL; | |
705 | ||
eabdec04 | 706 | memset(&cur_setting64, 0, sizeof(cur_setting64)); |
d97bb75d | 707 | kc = timr->kclock; |
a7319fa2 TG |
708 | if (WARN_ON_ONCE(!kc || !kc->timer_get)) |
709 | ret = -EINVAL; | |
710 | else | |
5f252b32 | 711 | kc->timer_get(timr, &cur_setting64); |
1da177e4 LT |
712 | |
713 | unlock_timer(timr, flags); | |
714 | ||
5f252b32 | 715 | cur_setting = itimerspec64_to_itimerspec(&cur_setting64); |
a7319fa2 | 716 | if (!ret && copy_to_user(setting, &cur_setting, sizeof (cur_setting))) |
1da177e4 LT |
717 | return -EFAULT; |
718 | ||
a7319fa2 | 719 | return ret; |
1da177e4 | 720 | } |
becf8b5d | 721 | |
1da177e4 LT |
722 | /* |
723 | * Get the number of overruns of a POSIX.1b interval timer. This is to | |
724 | * be the overrun of the timer last delivered. At the same time we are | |
725 | * accumulating overruns on the next timer. The overrun is frozen when | |
726 | * the signal is delivered, either at the notify time (if the info block | |
727 | * is not queued) or at the actual delivery time (as we are informed by | |
96fe3b07 | 728 | * the call back to posixtimer_rearm(). So all we need to do is |
1da177e4 LT |
729 | * to pick up the frozen overrun. |
730 | */ | |
362e9c07 | 731 | SYSCALL_DEFINE1(timer_getoverrun, timer_t, timer_id) |
1da177e4 LT |
732 | { |
733 | struct k_itimer *timr; | |
734 | int overrun; | |
5ba25331 | 735 | unsigned long flags; |
1da177e4 LT |
736 | |
737 | timr = lock_timer(timer_id, &flags); | |
738 | if (!timr) | |
739 | return -EINVAL; | |
740 | ||
741 | overrun = timr->it_overrun_last; | |
742 | unlock_timer(timr, flags); | |
743 | ||
744 | return overrun; | |
745 | } | |
1da177e4 | 746 | |
eae1c4ae TG |
747 | static void common_hrtimer_arm(struct k_itimer *timr, ktime_t expires, |
748 | bool absolute, bool sigev_none) | |
749 | { | |
750 | struct hrtimer *timer = &timr->it.real.timer; | |
751 | enum hrtimer_mode mode; | |
752 | ||
753 | mode = absolute ? HRTIMER_MODE_ABS : HRTIMER_MODE_REL; | |
67edab48 TG |
754 | /* |
755 | * Posix magic: Relative CLOCK_REALTIME timers are not affected by | |
756 | * clock modifications, so they become CLOCK_MONOTONIC based under the | |
757 | * hood. See hrtimer_init(). Update timr->kclock, so the generic | |
758 | * functions which use timr->kclock->clock_get() work. | |
759 | * | |
760 | * Note: it_clock stays unmodified, because the next timer_set() might | |
761 | * use ABSTIME, so it needs to switch back. | |
762 | */ | |
763 | if (timr->it_clock == CLOCK_REALTIME) | |
764 | timr->kclock = absolute ? &clock_realtime : &clock_monotonic; | |
765 | ||
eae1c4ae TG |
766 | hrtimer_init(&timr->it.real.timer, timr->it_clock, mode); |
767 | timr->it.real.timer.function = posix_timer_fn; | |
768 | ||
769 | if (!absolute) | |
770 | expires = ktime_add_safe(expires, timer->base->get_time()); | |
771 | hrtimer_set_expires(timer, expires); | |
772 | ||
773 | if (!sigev_none) | |
774 | hrtimer_start_expires(timer, HRTIMER_MODE_ABS); | |
775 | } | |
776 | ||
777 | static int common_hrtimer_try_to_cancel(struct k_itimer *timr) | |
778 | { | |
779 | return hrtimer_try_to_cancel(&timr->it.real.timer); | |
780 | } | |
781 | ||
1da177e4 | 782 | /* Set a POSIX.1b interval timer. */ |
f2c45807 TG |
783 | int common_timer_set(struct k_itimer *timr, int flags, |
784 | struct itimerspec64 *new_setting, | |
785 | struct itimerspec64 *old_setting) | |
1da177e4 | 786 | { |
eae1c4ae TG |
787 | const struct k_clock *kc = timr->kclock; |
788 | bool sigev_none; | |
789 | ktime_t expires; | |
1da177e4 LT |
790 | |
791 | if (old_setting) | |
792 | common_timer_get(timr, old_setting); | |
793 | ||
eae1c4ae | 794 | /* Prevent rearming by clearing the interval */ |
80105cd0 | 795 | timr->it_interval = 0; |
1da177e4 | 796 | /* |
eae1c4ae TG |
797 | * Careful here. On SMP systems the timer expiry function could be |
798 | * active and spinning on timr->it_lock. | |
1da177e4 | 799 | */ |
eae1c4ae | 800 | if (kc->timer_try_to_cancel(timr) < 0) |
1da177e4 | 801 | return TIMER_RETRY; |
1da177e4 | 802 | |
21e55c1f TG |
803 | timr->it_active = 0; |
804 | timr->it_requeue_pending = (timr->it_requeue_pending + 2) & | |
1da177e4 LT |
805 | ~REQUEUE_PENDING; |
806 | timr->it_overrun_last = 0; | |
1da177e4 | 807 | |
eae1c4ae | 808 | /* Switch off the timer when it_value is zero */ |
becf8b5d TG |
809 | if (!new_setting->it_value.tv_sec && !new_setting->it_value.tv_nsec) |
810 | return 0; | |
1da177e4 | 811 | |
80105cd0 | 812 | timr->it_interval = timespec64_to_ktime(new_setting->it_interval); |
eae1c4ae TG |
813 | expires = timespec64_to_ktime(new_setting->it_value); |
814 | sigev_none = (timr->it_sigev_notify & ~SIGEV_THREAD_ID) == SIGEV_NONE; | |
becf8b5d | 815 | |
eae1c4ae TG |
816 | kc->timer_arm(timr, expires, flags & TIMER_ABSTIME, sigev_none); |
817 | timr->it_active = !sigev_none; | |
1da177e4 LT |
818 | return 0; |
819 | } | |
820 | ||
821 | /* Set a POSIX.1b interval timer */ | |
362e9c07 HC |
822 | SYSCALL_DEFINE4(timer_settime, timer_t, timer_id, int, flags, |
823 | const struct itimerspec __user *, new_setting, | |
824 | struct itimerspec __user *, old_setting) | |
1da177e4 | 825 | { |
5f252b32 DD |
826 | struct itimerspec64 new_spec64, old_spec64; |
827 | struct itimerspec64 *rtn = old_setting ? &old_spec64 : NULL; | |
1da177e4 | 828 | struct itimerspec new_spec, old_spec; |
5f252b32 | 829 | struct k_itimer *timr; |
5ba25331 | 830 | unsigned long flag; |
d3ba5a9a | 831 | const struct k_clock *kc; |
5f252b32 | 832 | int error = 0; |
1da177e4 LT |
833 | |
834 | if (!new_setting) | |
835 | return -EINVAL; | |
836 | ||
837 | if (copy_from_user(&new_spec, new_setting, sizeof (new_spec))) | |
838 | return -EFAULT; | |
5f252b32 | 839 | new_spec64 = itimerspec_to_itimerspec64(&new_spec); |
1da177e4 | 840 | |
5f252b32 DD |
841 | if (!timespec64_valid(&new_spec64.it_interval) || |
842 | !timespec64_valid(&new_spec64.it_value)) | |
1da177e4 | 843 | return -EINVAL; |
5c7a3a3d TG |
844 | if (rtn) |
845 | memset(rtn, 0, sizeof(*rtn)); | |
1da177e4 LT |
846 | retry: |
847 | timr = lock_timer(timer_id, &flag); | |
848 | if (!timr) | |
849 | return -EINVAL; | |
850 | ||
d97bb75d | 851 | kc = timr->kclock; |
27722df1 TG |
852 | if (WARN_ON_ONCE(!kc || !kc->timer_set)) |
853 | error = -EINVAL; | |
854 | else | |
5f252b32 | 855 | error = kc->timer_set(timr, flags, &new_spec64, rtn); |
1da177e4 LT |
856 | |
857 | unlock_timer(timr, flag); | |
858 | if (error == TIMER_RETRY) { | |
859 | rtn = NULL; // We already got the old time... | |
860 | goto retry; | |
861 | } | |
862 | ||
5f252b32 | 863 | old_spec = itimerspec64_to_itimerspec(&old_spec64); |
becf8b5d TG |
864 | if (old_setting && !error && |
865 | copy_to_user(old_setting, &old_spec, sizeof (old_spec))) | |
1da177e4 LT |
866 | error = -EFAULT; |
867 | ||
868 | return error; | |
869 | } | |
870 | ||
f2c45807 | 871 | int common_timer_del(struct k_itimer *timer) |
1da177e4 | 872 | { |
eae1c4ae | 873 | const struct k_clock *kc = timer->kclock; |
f972be33 | 874 | |
eae1c4ae TG |
875 | timer->it_interval = 0; |
876 | if (kc->timer_try_to_cancel(timer) < 0) | |
1da177e4 | 877 | return TIMER_RETRY; |
21e55c1f | 878 | timer->it_active = 0; |
1da177e4 LT |
879 | return 0; |
880 | } | |
881 | ||
882 | static inline int timer_delete_hook(struct k_itimer *timer) | |
883 | { | |
d97bb75d | 884 | const struct k_clock *kc = timer->kclock; |
6761c670 TG |
885 | |
886 | if (WARN_ON_ONCE(!kc || !kc->timer_del)) | |
887 | return -EINVAL; | |
888 | return kc->timer_del(timer); | |
1da177e4 LT |
889 | } |
890 | ||
891 | /* Delete a POSIX.1b interval timer. */ | |
362e9c07 | 892 | SYSCALL_DEFINE1(timer_delete, timer_t, timer_id) |
1da177e4 LT |
893 | { |
894 | struct k_itimer *timer; | |
5ba25331 | 895 | unsigned long flags; |
1da177e4 | 896 | |
1da177e4 | 897 | retry_delete: |
1da177e4 LT |
898 | timer = lock_timer(timer_id, &flags); |
899 | if (!timer) | |
900 | return -EINVAL; | |
901 | ||
becf8b5d | 902 | if (timer_delete_hook(timer) == TIMER_RETRY) { |
1da177e4 LT |
903 | unlock_timer(timer, flags); |
904 | goto retry_delete; | |
905 | } | |
becf8b5d | 906 | |
1da177e4 LT |
907 | spin_lock(¤t->sighand->siglock); |
908 | list_del(&timer->list); | |
909 | spin_unlock(¤t->sighand->siglock); | |
910 | /* | |
911 | * This keeps any tasks waiting on the spin lock from thinking | |
912 | * they got something (see the lock code above). | |
913 | */ | |
89992102 | 914 | timer->it_signal = NULL; |
4b7a1304 | 915 | |
1da177e4 LT |
916 | unlock_timer(timer, flags); |
917 | release_posix_timer(timer, IT_ID_SET); | |
918 | return 0; | |
919 | } | |
becf8b5d | 920 | |
1da177e4 LT |
921 | /* |
922 | * return timer owned by the process, used by exit_itimers | |
923 | */ | |
858119e1 | 924 | static void itimer_delete(struct k_itimer *timer) |
1da177e4 LT |
925 | { |
926 | unsigned long flags; | |
927 | ||
1da177e4 | 928 | retry_delete: |
1da177e4 LT |
929 | spin_lock_irqsave(&timer->it_lock, flags); |
930 | ||
becf8b5d | 931 | if (timer_delete_hook(timer) == TIMER_RETRY) { |
1da177e4 LT |
932 | unlock_timer(timer, flags); |
933 | goto retry_delete; | |
934 | } | |
1da177e4 LT |
935 | list_del(&timer->list); |
936 | /* | |
937 | * This keeps any tasks waiting on the spin lock from thinking | |
938 | * they got something (see the lock code above). | |
939 | */ | |
89992102 | 940 | timer->it_signal = NULL; |
4b7a1304 | 941 | |
1da177e4 LT |
942 | unlock_timer(timer, flags); |
943 | release_posix_timer(timer, IT_ID_SET); | |
944 | } | |
945 | ||
946 | /* | |
25f407f0 | 947 | * This is called by do_exit or de_thread, only when there are no more |
1da177e4 LT |
948 | * references to the shared signal_struct. |
949 | */ | |
950 | void exit_itimers(struct signal_struct *sig) | |
951 | { | |
952 | struct k_itimer *tmr; | |
953 | ||
954 | while (!list_empty(&sig->posix_timers)) { | |
955 | tmr = list_entry(sig->posix_timers.next, struct k_itimer, list); | |
956 | itimer_delete(tmr); | |
957 | } | |
958 | } | |
959 | ||
362e9c07 HC |
960 | SYSCALL_DEFINE2(clock_settime, const clockid_t, which_clock, |
961 | const struct timespec __user *, tp) | |
1da177e4 | 962 | { |
d3ba5a9a | 963 | const struct k_clock *kc = clockid_to_kclock(which_clock); |
0fe6afe3 | 964 | struct timespec64 new_tp64; |
1da177e4 LT |
965 | struct timespec new_tp; |
966 | ||
26f9a479 | 967 | if (!kc || !kc->clock_set) |
1da177e4 | 968 | return -EINVAL; |
26f9a479 | 969 | |
1da177e4 LT |
970 | if (copy_from_user(&new_tp, tp, sizeof (*tp))) |
971 | return -EFAULT; | |
0fe6afe3 | 972 | new_tp64 = timespec_to_timespec64(new_tp); |
1da177e4 | 973 | |
0fe6afe3 | 974 | return kc->clock_set(which_clock, &new_tp64); |
1da177e4 LT |
975 | } |
976 | ||
362e9c07 HC |
977 | SYSCALL_DEFINE2(clock_gettime, const clockid_t, which_clock, |
978 | struct timespec __user *,tp) | |
1da177e4 | 979 | { |
d3ba5a9a | 980 | const struct k_clock *kc = clockid_to_kclock(which_clock); |
3c9c12f4 | 981 | struct timespec64 kernel_tp64; |
1da177e4 LT |
982 | struct timespec kernel_tp; |
983 | int error; | |
984 | ||
42285777 | 985 | if (!kc) |
1da177e4 | 986 | return -EINVAL; |
42285777 | 987 | |
3c9c12f4 DD |
988 | error = kc->clock_get(which_clock, &kernel_tp64); |
989 | kernel_tp = timespec64_to_timespec(kernel_tp64); | |
42285777 | 990 | |
1da177e4 LT |
991 | if (!error && copy_to_user(tp, &kernel_tp, sizeof (kernel_tp))) |
992 | error = -EFAULT; | |
993 | ||
994 | return error; | |
1da177e4 LT |
995 | } |
996 | ||
f1f1d5eb RC |
997 | SYSCALL_DEFINE2(clock_adjtime, const clockid_t, which_clock, |
998 | struct timex __user *, utx) | |
999 | { | |
d3ba5a9a | 1000 | const struct k_clock *kc = clockid_to_kclock(which_clock); |
f1f1d5eb RC |
1001 | struct timex ktx; |
1002 | int err; | |
1003 | ||
1004 | if (!kc) | |
1005 | return -EINVAL; | |
1006 | if (!kc->clock_adj) | |
1007 | return -EOPNOTSUPP; | |
1008 | ||
1009 | if (copy_from_user(&ktx, utx, sizeof(ktx))) | |
1010 | return -EFAULT; | |
1011 | ||
1012 | err = kc->clock_adj(which_clock, &ktx); | |
1013 | ||
f0dbe81f | 1014 | if (err >= 0 && copy_to_user(utx, &ktx, sizeof(ktx))) |
f1f1d5eb RC |
1015 | return -EFAULT; |
1016 | ||
1017 | return err; | |
1018 | } | |
1019 | ||
362e9c07 HC |
1020 | SYSCALL_DEFINE2(clock_getres, const clockid_t, which_clock, |
1021 | struct timespec __user *, tp) | |
1da177e4 | 1022 | { |
d3ba5a9a | 1023 | const struct k_clock *kc = clockid_to_kclock(which_clock); |
d2e3e0ca | 1024 | struct timespec64 rtn_tp64; |
1da177e4 LT |
1025 | struct timespec rtn_tp; |
1026 | int error; | |
1027 | ||
e5e542ee | 1028 | if (!kc) |
1da177e4 LT |
1029 | return -EINVAL; |
1030 | ||
d2e3e0ca DD |
1031 | error = kc->clock_getres(which_clock, &rtn_tp64); |
1032 | rtn_tp = timespec64_to_timespec(rtn_tp64); | |
1da177e4 | 1033 | |
e5e542ee | 1034 | if (!error && tp && copy_to_user(tp, &rtn_tp, sizeof (rtn_tp))) |
1da177e4 | 1035 | error = -EFAULT; |
1da177e4 LT |
1036 | |
1037 | return error; | |
1038 | } | |
1039 | ||
97735f25 TG |
1040 | /* |
1041 | * nanosleep for monotonic and realtime clocks | |
1042 | */ | |
1043 | static int common_nsleep(const clockid_t which_clock, int flags, | |
ad196384 | 1044 | struct timespec64 *tsave, struct timespec __user *rmtp) |
97735f25 | 1045 | { |
080344b9 ON |
1046 | return hrtimer_nanosleep(tsave, rmtp, flags & TIMER_ABSTIME ? |
1047 | HRTIMER_MODE_ABS : HRTIMER_MODE_REL, | |
1048 | which_clock); | |
97735f25 | 1049 | } |
1da177e4 | 1050 | |
362e9c07 HC |
1051 | SYSCALL_DEFINE4(clock_nanosleep, const clockid_t, which_clock, int, flags, |
1052 | const struct timespec __user *, rqtp, | |
1053 | struct timespec __user *, rmtp) | |
1da177e4 | 1054 | { |
d3ba5a9a | 1055 | const struct k_clock *kc = clockid_to_kclock(which_clock); |
ad196384 | 1056 | struct timespec64 t64; |
1da177e4 | 1057 | struct timespec t; |
1da177e4 | 1058 | |
a5cd2880 | 1059 | if (!kc) |
1da177e4 | 1060 | return -EINVAL; |
a5cd2880 TG |
1061 | if (!kc->nsleep) |
1062 | return -ENANOSLEEP_NOTSUP; | |
1da177e4 LT |
1063 | |
1064 | if (copy_from_user(&t, rqtp, sizeof (struct timespec))) | |
1065 | return -EFAULT; | |
1066 | ||
ad196384 DD |
1067 | t64 = timespec_to_timespec64(t); |
1068 | if (!timespec64_valid(&t64)) | |
1da177e4 LT |
1069 | return -EINVAL; |
1070 | ||
ad196384 | 1071 | return kc->nsleep(which_clock, flags, &t64, rmtp); |
1da177e4 | 1072 | } |
1711ef38 | 1073 | |
1711ef38 TA |
1074 | /* |
1075 | * This will restart clock_nanosleep. This is required only by | |
1076 | * compat_clock_nanosleep_restart for now. | |
1077 | */ | |
59bd5bc2 | 1078 | long clock_nanosleep_restart(struct restart_block *restart_block) |
1711ef38 | 1079 | { |
ab8177bc | 1080 | clockid_t which_clock = restart_block->nanosleep.clockid; |
d3ba5a9a | 1081 | const struct k_clock *kc = clockid_to_kclock(which_clock); |
59bd5bc2 TG |
1082 | |
1083 | if (WARN_ON_ONCE(!kc || !kc->nsleep_restart)) | |
1084 | return -EINVAL; | |
1711ef38 | 1085 | |
59bd5bc2 | 1086 | return kc->nsleep_restart(restart_block); |
1711ef38 | 1087 | } |
6631fa12 TG |
1088 | |
1089 | static const struct k_clock clock_realtime = { | |
eae1c4ae TG |
1090 | .clock_getres = posix_get_hrtimer_res, |
1091 | .clock_get = posix_clock_realtime_get, | |
1092 | .clock_set = posix_clock_realtime_set, | |
1093 | .clock_adj = posix_clock_realtime_adj, | |
1094 | .nsleep = common_nsleep, | |
1095 | .nsleep_restart = hrtimer_nanosleep_restart, | |
1096 | .timer_create = common_timer_create, | |
1097 | .timer_set = common_timer_set, | |
1098 | .timer_get = common_timer_get, | |
1099 | .timer_del = common_timer_del, | |
1100 | .timer_rearm = common_hrtimer_rearm, | |
1101 | .timer_forward = common_hrtimer_forward, | |
1102 | .timer_remaining = common_hrtimer_remaining, | |
1103 | .timer_try_to_cancel = common_hrtimer_try_to_cancel, | |
1104 | .timer_arm = common_hrtimer_arm, | |
6631fa12 TG |
1105 | }; |
1106 | ||
1107 | static const struct k_clock clock_monotonic = { | |
eae1c4ae TG |
1108 | .clock_getres = posix_get_hrtimer_res, |
1109 | .clock_get = posix_ktime_get_ts, | |
1110 | .nsleep = common_nsleep, | |
1111 | .nsleep_restart = hrtimer_nanosleep_restart, | |
1112 | .timer_create = common_timer_create, | |
1113 | .timer_set = common_timer_set, | |
1114 | .timer_get = common_timer_get, | |
1115 | .timer_del = common_timer_del, | |
1116 | .timer_rearm = common_hrtimer_rearm, | |
1117 | .timer_forward = common_hrtimer_forward, | |
1118 | .timer_remaining = common_hrtimer_remaining, | |
1119 | .timer_try_to_cancel = common_hrtimer_try_to_cancel, | |
1120 | .timer_arm = common_hrtimer_arm, | |
6631fa12 TG |
1121 | }; |
1122 | ||
1123 | static const struct k_clock clock_monotonic_raw = { | |
eae1c4ae TG |
1124 | .clock_getres = posix_get_hrtimer_res, |
1125 | .clock_get = posix_get_monotonic_raw, | |
6631fa12 TG |
1126 | }; |
1127 | ||
1128 | static const struct k_clock clock_realtime_coarse = { | |
eae1c4ae TG |
1129 | .clock_getres = posix_get_coarse_res, |
1130 | .clock_get = posix_get_realtime_coarse, | |
6631fa12 TG |
1131 | }; |
1132 | ||
1133 | static const struct k_clock clock_monotonic_coarse = { | |
eae1c4ae TG |
1134 | .clock_getres = posix_get_coarse_res, |
1135 | .clock_get = posix_get_monotonic_coarse, | |
6631fa12 TG |
1136 | }; |
1137 | ||
1138 | static const struct k_clock clock_tai = { | |
eae1c4ae TG |
1139 | .clock_getres = posix_get_hrtimer_res, |
1140 | .clock_get = posix_get_tai, | |
1141 | .nsleep = common_nsleep, | |
1142 | .nsleep_restart = hrtimer_nanosleep_restart, | |
1143 | .timer_create = common_timer_create, | |
1144 | .timer_set = common_timer_set, | |
1145 | .timer_get = common_timer_get, | |
1146 | .timer_del = common_timer_del, | |
1147 | .timer_rearm = common_hrtimer_rearm, | |
1148 | .timer_forward = common_hrtimer_forward, | |
1149 | .timer_remaining = common_hrtimer_remaining, | |
1150 | .timer_try_to_cancel = common_hrtimer_try_to_cancel, | |
1151 | .timer_arm = common_hrtimer_arm, | |
6631fa12 TG |
1152 | }; |
1153 | ||
1154 | static const struct k_clock clock_boottime = { | |
eae1c4ae TG |
1155 | .clock_getres = posix_get_hrtimer_res, |
1156 | .clock_get = posix_get_boottime, | |
1157 | .nsleep = common_nsleep, | |
1158 | .nsleep_restart = hrtimer_nanosleep_restart, | |
1159 | .timer_create = common_timer_create, | |
1160 | .timer_set = common_timer_set, | |
1161 | .timer_get = common_timer_get, | |
1162 | .timer_del = common_timer_del, | |
1163 | .timer_rearm = common_hrtimer_rearm, | |
1164 | .timer_forward = common_hrtimer_forward, | |
1165 | .timer_remaining = common_hrtimer_remaining, | |
1166 | .timer_try_to_cancel = common_hrtimer_try_to_cancel, | |
1167 | .timer_arm = common_hrtimer_arm, | |
6631fa12 TG |
1168 | }; |
1169 | ||
1170 | static const struct k_clock * const posix_clocks[] = { | |
1171 | [CLOCK_REALTIME] = &clock_realtime, | |
1172 | [CLOCK_MONOTONIC] = &clock_monotonic, | |
1173 | [CLOCK_PROCESS_CPUTIME_ID] = &clock_process, | |
1174 | [CLOCK_THREAD_CPUTIME_ID] = &clock_thread, | |
1175 | [CLOCK_MONOTONIC_RAW] = &clock_monotonic_raw, | |
1176 | [CLOCK_REALTIME_COARSE] = &clock_realtime_coarse, | |
1177 | [CLOCK_MONOTONIC_COARSE] = &clock_monotonic_coarse, | |
1178 | [CLOCK_BOOTTIME] = &clock_boottime, | |
1179 | [CLOCK_REALTIME_ALARM] = &alarm_clock, | |
1180 | [CLOCK_BOOTTIME_ALARM] = &alarm_clock, | |
1181 | [CLOCK_TAI] = &clock_tai, | |
1182 | }; | |
1183 | ||
1184 | static const struct k_clock *clockid_to_kclock(const clockid_t id) | |
1185 | { | |
1186 | if (id < 0) | |
1187 | return (id & CLOCKFD_MASK) == CLOCKFD ? | |
1188 | &clock_posix_dynamic : &clock_posix_cpu; | |
1189 | ||
1190 | if (id >= ARRAY_SIZE(posix_clocks) || !posix_clocks[id]) | |
1191 | return NULL; | |
1192 | return posix_clocks[id]; | |
1193 | } |