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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> |
1da177e4 LT |
38 | |
39 | #include <asm/uaccess.h> | |
1da177e4 LT |
40 | #include <linux/list.h> |
41 | #include <linux/init.h> | |
42 | #include <linux/compiler.h> | |
43 | #include <linux/idr.h> | |
44 | #include <linux/posix-timers.h> | |
45 | #include <linux/syscalls.h> | |
46 | #include <linux/wait.h> | |
47 | #include <linux/workqueue.h> | |
48 | #include <linux/module.h> | |
49 | ||
1da177e4 LT |
50 | /* |
51 | * Management arrays for POSIX timers. Timers are kept in slab memory | |
52 | * Timer ids are allocated by an external routine that keeps track of the | |
53 | * id and the timer. The external interface is: | |
54 | * | |
55 | * void *idr_find(struct idr *idp, int id); to find timer_id <id> | |
56 | * int idr_get_new(struct idr *idp, void *ptr); to get a new id and | |
57 | * related it to <ptr> | |
58 | * void idr_remove(struct idr *idp, int id); to release <id> | |
59 | * void idr_init(struct idr *idp); to initialize <idp> | |
60 | * which we supply. | |
61 | * The idr_get_new *may* call slab for more memory so it must not be | |
62 | * called under a spin lock. Likewise idr_remore may release memory | |
63 | * (but it may be ok to do this under a lock...). | |
64 | * idr_find is just a memory look up and is quite fast. A -1 return | |
65 | * indicates that the requested id does not exist. | |
66 | */ | |
67 | ||
68 | /* | |
69 | * Lets keep our timers in a slab cache :-) | |
70 | */ | |
e18b890b | 71 | static struct kmem_cache *posix_timers_cache; |
1da177e4 LT |
72 | static struct idr posix_timers_id; |
73 | static DEFINE_SPINLOCK(idr_lock); | |
74 | ||
1da177e4 LT |
75 | /* |
76 | * we assume that the new SIGEV_THREAD_ID shares no bits with the other | |
77 | * SIGEV values. Here we put out an error if this assumption fails. | |
78 | */ | |
79 | #if SIGEV_THREAD_ID != (SIGEV_THREAD_ID & \ | |
80 | ~(SIGEV_SIGNAL | SIGEV_NONE | SIGEV_THREAD)) | |
81 | #error "SIGEV_THREAD_ID must not share bit with other SIGEV values!" | |
82 | #endif | |
83 | ||
65da528d TG |
84 | /* |
85 | * parisc wants ENOTSUP instead of EOPNOTSUPP | |
86 | */ | |
87 | #ifndef ENOTSUP | |
88 | # define ENANOSLEEP_NOTSUP EOPNOTSUPP | |
89 | #else | |
90 | # define ENANOSLEEP_NOTSUP ENOTSUP | |
91 | #endif | |
1da177e4 LT |
92 | |
93 | /* | |
94 | * The timer ID is turned into a timer address by idr_find(). | |
95 | * Verifying a valid ID consists of: | |
96 | * | |
97 | * a) checking that idr_find() returns other than -1. | |
98 | * b) checking that the timer id matches the one in the timer itself. | |
99 | * c) that the timer owner is in the callers thread group. | |
100 | */ | |
101 | ||
102 | /* | |
103 | * CLOCKs: The POSIX standard calls for a couple of clocks and allows us | |
104 | * to implement others. This structure defines the various | |
0061748d | 105 | * clocks. |
1da177e4 LT |
106 | * |
107 | * RESOLUTION: Clock resolution is used to round up timer and interval | |
108 | * times, NOT to report clock times, which are reported with as | |
109 | * much resolution as the system can muster. In some cases this | |
110 | * resolution may depend on the underlying clock hardware and | |
111 | * may not be quantifiable until run time, and only then is the | |
112 | * necessary code is written. The standard says we should say | |
113 | * something about this issue in the documentation... | |
114 | * | |
0061748d RC |
115 | * FUNCTIONS: The CLOCKs structure defines possible functions to |
116 | * handle various clock functions. | |
1da177e4 | 117 | * |
0061748d RC |
118 | * The standard POSIX timer management code assumes the |
119 | * following: 1.) The k_itimer struct (sched.h) is used for | |
120 | * the timer. 2.) The list, it_lock, it_clock, it_id and | |
121 | * it_pid fields are not modified by timer code. | |
1da177e4 LT |
122 | * |
123 | * Permissions: It is assumed that the clock_settime() function defined | |
124 | * for each clock will take care of permission checks. Some | |
125 | * clocks may be set able by any user (i.e. local process | |
126 | * clocks) others not. Currently the only set able clock we | |
127 | * have is CLOCK_REALTIME and its high res counter part, both of | |
128 | * which we beg off on and pass to do_sys_settimeofday(). | |
129 | */ | |
130 | ||
131 | static struct k_clock posix_clocks[MAX_CLOCKS]; | |
becf8b5d | 132 | |
1da177e4 | 133 | /* |
becf8b5d | 134 | * These ones are defined below. |
1da177e4 | 135 | */ |
becf8b5d TG |
136 | static int common_nsleep(const clockid_t, int flags, struct timespec *t, |
137 | struct timespec __user *rmtp); | |
838394fb | 138 | static int common_timer_create(struct k_itimer *new_timer); |
becf8b5d TG |
139 | static void common_timer_get(struct k_itimer *, struct itimerspec *); |
140 | static int common_timer_set(struct k_itimer *, int, | |
141 | struct itimerspec *, struct itimerspec *); | |
142 | static int common_timer_del(struct k_itimer *timer); | |
1da177e4 | 143 | |
c9cb2e3d | 144 | static enum hrtimer_restart posix_timer_fn(struct hrtimer *data); |
1da177e4 | 145 | |
20f33a03 NK |
146 | static struct k_itimer *__lock_timer(timer_t timer_id, unsigned long *flags); |
147 | ||
148 | #define lock_timer(tid, flags) \ | |
149 | ({ struct k_itimer *__timr; \ | |
150 | __cond_lock(&__timr->it_lock, __timr = __lock_timer(tid, flags)); \ | |
151 | __timr; \ | |
152 | }) | |
1da177e4 LT |
153 | |
154 | static inline void unlock_timer(struct k_itimer *timr, unsigned long flags) | |
155 | { | |
156 | spin_unlock_irqrestore(&timr->it_lock, flags); | |
157 | } | |
158 | ||
42285777 TG |
159 | /* Get clock_realtime */ |
160 | static int posix_clock_realtime_get(clockid_t which_clock, struct timespec *tp) | |
161 | { | |
162 | ktime_get_real_ts(tp); | |
163 | return 0; | |
164 | } | |
165 | ||
26f9a479 TG |
166 | /* Set clock_realtime */ |
167 | static int posix_clock_realtime_set(const clockid_t which_clock, | |
168 | const struct timespec *tp) | |
169 | { | |
170 | return do_sys_settimeofday(tp, NULL); | |
171 | } | |
172 | ||
f1f1d5eb RC |
173 | static int posix_clock_realtime_adj(const clockid_t which_clock, |
174 | struct timex *t) | |
175 | { | |
176 | return do_adjtimex(t); | |
177 | } | |
178 | ||
becf8b5d TG |
179 | /* |
180 | * Get monotonic time for posix timers | |
181 | */ | |
182 | static int posix_ktime_get_ts(clockid_t which_clock, struct timespec *tp) | |
183 | { | |
184 | ktime_get_ts(tp); | |
185 | return 0; | |
186 | } | |
1da177e4 | 187 | |
2d42244a JS |
188 | /* |
189 | * Get monotonic time for posix timers | |
190 | */ | |
191 | static int posix_get_monotonic_raw(clockid_t which_clock, struct timespec *tp) | |
192 | { | |
193 | getrawmonotonic(tp); | |
194 | return 0; | |
195 | } | |
196 | ||
da15cfda JS |
197 | |
198 | static int posix_get_realtime_coarse(clockid_t which_clock, struct timespec *tp) | |
199 | { | |
200 | *tp = current_kernel_time(); | |
201 | return 0; | |
202 | } | |
203 | ||
204 | static int posix_get_monotonic_coarse(clockid_t which_clock, | |
205 | struct timespec *tp) | |
206 | { | |
207 | *tp = get_monotonic_coarse(); | |
208 | return 0; | |
209 | } | |
210 | ||
6622e670 | 211 | static int posix_get_coarse_res(const clockid_t which_clock, struct timespec *tp) |
da15cfda JS |
212 | { |
213 | *tp = ktime_to_timespec(KTIME_LOW_RES); | |
214 | return 0; | |
215 | } | |
1da177e4 LT |
216 | /* |
217 | * Initialize everything, well, just everything in Posix clocks/timers ;) | |
218 | */ | |
219 | static __init int init_posix_timers(void) | |
220 | { | |
becf8b5d | 221 | struct k_clock clock_realtime = { |
2fd1f040 | 222 | .clock_getres = hrtimer_get_res, |
42285777 | 223 | .clock_get = posix_clock_realtime_get, |
26f9a479 | 224 | .clock_set = posix_clock_realtime_set, |
f1f1d5eb | 225 | .clock_adj = posix_clock_realtime_adj, |
a5cd2880 | 226 | .nsleep = common_nsleep, |
59bd5bc2 | 227 | .nsleep_restart = hrtimer_nanosleep_restart, |
838394fb | 228 | .timer_create = common_timer_create, |
27722df1 | 229 | .timer_set = common_timer_set, |
a7319fa2 | 230 | .timer_get = common_timer_get, |
6761c670 | 231 | .timer_del = common_timer_del, |
1da177e4 | 232 | }; |
becf8b5d | 233 | struct k_clock clock_monotonic = { |
2fd1f040 TG |
234 | .clock_getres = hrtimer_get_res, |
235 | .clock_get = posix_ktime_get_ts, | |
a5cd2880 | 236 | .nsleep = common_nsleep, |
59bd5bc2 | 237 | .nsleep_restart = hrtimer_nanosleep_restart, |
838394fb | 238 | .timer_create = common_timer_create, |
27722df1 | 239 | .timer_set = common_timer_set, |
a7319fa2 | 240 | .timer_get = common_timer_get, |
6761c670 | 241 | .timer_del = common_timer_del, |
1da177e4 | 242 | }; |
2d42244a | 243 | struct k_clock clock_monotonic_raw = { |
2fd1f040 TG |
244 | .clock_getres = hrtimer_get_res, |
245 | .clock_get = posix_get_monotonic_raw, | |
2d42244a | 246 | }; |
da15cfda | 247 | struct k_clock clock_realtime_coarse = { |
2fd1f040 TG |
248 | .clock_getres = posix_get_coarse_res, |
249 | .clock_get = posix_get_realtime_coarse, | |
da15cfda JS |
250 | }; |
251 | struct k_clock clock_monotonic_coarse = { | |
2fd1f040 TG |
252 | .clock_getres = posix_get_coarse_res, |
253 | .clock_get = posix_get_monotonic_coarse, | |
da15cfda | 254 | }; |
1da177e4 | 255 | |
52708737 TG |
256 | posix_timers_register_clock(CLOCK_REALTIME, &clock_realtime); |
257 | posix_timers_register_clock(CLOCK_MONOTONIC, &clock_monotonic); | |
258 | posix_timers_register_clock(CLOCK_MONOTONIC_RAW, &clock_monotonic_raw); | |
259 | posix_timers_register_clock(CLOCK_REALTIME_COARSE, &clock_realtime_coarse); | |
260 | posix_timers_register_clock(CLOCK_MONOTONIC_COARSE, &clock_monotonic_coarse); | |
1da177e4 LT |
261 | |
262 | posix_timers_cache = kmem_cache_create("posix_timers_cache", | |
040b5c6f AD |
263 | sizeof (struct k_itimer), 0, SLAB_PANIC, |
264 | NULL); | |
1da177e4 LT |
265 | idr_init(&posix_timers_id); |
266 | return 0; | |
267 | } | |
268 | ||
269 | __initcall(init_posix_timers); | |
270 | ||
1da177e4 LT |
271 | static void schedule_next_timer(struct k_itimer *timr) |
272 | { | |
44f21475 RZ |
273 | struct hrtimer *timer = &timr->it.real.timer; |
274 | ||
becf8b5d | 275 | if (timr->it.real.interval.tv64 == 0) |
1da177e4 LT |
276 | return; |
277 | ||
4d672e7a DL |
278 | timr->it_overrun += (unsigned int) hrtimer_forward(timer, |
279 | timer->base->get_time(), | |
280 | timr->it.real.interval); | |
44f21475 | 281 | |
1da177e4 LT |
282 | timr->it_overrun_last = timr->it_overrun; |
283 | timr->it_overrun = -1; | |
284 | ++timr->it_requeue_pending; | |
44f21475 | 285 | hrtimer_restart(timer); |
1da177e4 LT |
286 | } |
287 | ||
288 | /* | |
289 | * This function is exported for use by the signal deliver code. It is | |
290 | * called just prior to the info block being released and passes that | |
291 | * block to us. It's function is to update the overrun entry AND to | |
292 | * restart the timer. It should only be called if the timer is to be | |
293 | * restarted (i.e. we have flagged this in the sys_private entry of the | |
294 | * info block). | |
295 | * | |
296 | * To protect aginst the timer going away while the interrupt is queued, | |
297 | * we require that the it_requeue_pending flag be set. | |
298 | */ | |
299 | void do_schedule_next_timer(struct siginfo *info) | |
300 | { | |
301 | struct k_itimer *timr; | |
302 | unsigned long flags; | |
303 | ||
304 | timr = lock_timer(info->si_tid, &flags); | |
305 | ||
becf8b5d TG |
306 | if (timr && timr->it_requeue_pending == info->si_sys_private) { |
307 | if (timr->it_clock < 0) | |
308 | posix_cpu_timer_schedule(timr); | |
309 | else | |
310 | schedule_next_timer(timr); | |
1da177e4 | 311 | |
54da1174 | 312 | info->si_overrun += timr->it_overrun_last; |
becf8b5d TG |
313 | } |
314 | ||
b6557fbc TG |
315 | if (timr) |
316 | unlock_timer(timr, flags); | |
1da177e4 LT |
317 | } |
318 | ||
ba661292 | 319 | int posix_timer_event(struct k_itimer *timr, int si_private) |
1da177e4 | 320 | { |
27af4245 ON |
321 | struct task_struct *task; |
322 | int shared, ret = -1; | |
ba661292 ON |
323 | /* |
324 | * FIXME: if ->sigq is queued we can race with | |
325 | * dequeue_signal()->do_schedule_next_timer(). | |
326 | * | |
327 | * If dequeue_signal() sees the "right" value of | |
328 | * si_sys_private it calls do_schedule_next_timer(). | |
329 | * We re-queue ->sigq and drop ->it_lock(). | |
330 | * do_schedule_next_timer() locks the timer | |
331 | * and re-schedules it while ->sigq is pending. | |
332 | * Not really bad, but not that we want. | |
333 | */ | |
1da177e4 | 334 | timr->sigq->info.si_sys_private = si_private; |
1da177e4 | 335 | |
27af4245 ON |
336 | rcu_read_lock(); |
337 | task = pid_task(timr->it_pid, PIDTYPE_PID); | |
338 | if (task) { | |
339 | shared = !(timr->it_sigev_notify & SIGEV_THREAD_ID); | |
340 | ret = send_sigqueue(timr->sigq, task, shared); | |
341 | } | |
342 | rcu_read_unlock(); | |
4aa73611 ON |
343 | /* If we failed to send the signal the timer stops. */ |
344 | return ret > 0; | |
1da177e4 LT |
345 | } |
346 | EXPORT_SYMBOL_GPL(posix_timer_event); | |
347 | ||
348 | /* | |
349 | * This function gets called when a POSIX.1b interval timer expires. It | |
350 | * is used as a callback from the kernel internal timer. The | |
351 | * run_timer_list code ALWAYS calls with interrupts on. | |
352 | ||
353 | * This code is for CLOCK_REALTIME* and CLOCK_MONOTONIC* timers. | |
354 | */ | |
c9cb2e3d | 355 | static enum hrtimer_restart posix_timer_fn(struct hrtimer *timer) |
1da177e4 | 356 | { |
05cfb614 | 357 | struct k_itimer *timr; |
1da177e4 | 358 | unsigned long flags; |
becf8b5d | 359 | int si_private = 0; |
c9cb2e3d | 360 | enum hrtimer_restart ret = HRTIMER_NORESTART; |
1da177e4 | 361 | |
05cfb614 | 362 | timr = container_of(timer, struct k_itimer, it.real.timer); |
1da177e4 | 363 | spin_lock_irqsave(&timr->it_lock, flags); |
1da177e4 | 364 | |
becf8b5d TG |
365 | if (timr->it.real.interval.tv64 != 0) |
366 | si_private = ++timr->it_requeue_pending; | |
1da177e4 | 367 | |
becf8b5d TG |
368 | if (posix_timer_event(timr, si_private)) { |
369 | /* | |
370 | * signal was not sent because of sig_ignor | |
371 | * we will not get a call back to restart it AND | |
372 | * it should be restarted. | |
373 | */ | |
374 | if (timr->it.real.interval.tv64 != 0) { | |
58229a18 TG |
375 | ktime_t now = hrtimer_cb_get_time(timer); |
376 | ||
377 | /* | |
378 | * FIXME: What we really want, is to stop this | |
379 | * timer completely and restart it in case the | |
380 | * SIG_IGN is removed. This is a non trivial | |
381 | * change which involves sighand locking | |
382 | * (sigh !), which we don't want to do late in | |
383 | * the release cycle. | |
384 | * | |
385 | * For now we just let timers with an interval | |
386 | * less than a jiffie expire every jiffie to | |
387 | * avoid softirq starvation in case of SIG_IGN | |
388 | * and a very small interval, which would put | |
389 | * the timer right back on the softirq pending | |
390 | * list. By moving now ahead of time we trick | |
391 | * hrtimer_forward() to expire the timer | |
392 | * later, while we still maintain the overrun | |
393 | * accuracy, but have some inconsistency in | |
394 | * the timer_gettime() case. This is at least | |
395 | * better than a starved softirq. A more | |
396 | * complex fix which solves also another related | |
397 | * inconsistency is already in the pipeline. | |
398 | */ | |
399 | #ifdef CONFIG_HIGH_RES_TIMERS | |
400 | { | |
401 | ktime_t kj = ktime_set(0, NSEC_PER_SEC / HZ); | |
402 | ||
403 | if (timr->it.real.interval.tv64 < kj.tv64) | |
404 | now = ktime_add(now, kj); | |
405 | } | |
406 | #endif | |
4d672e7a | 407 | timr->it_overrun += (unsigned int) |
58229a18 | 408 | hrtimer_forward(timer, now, |
becf8b5d TG |
409 | timr->it.real.interval); |
410 | ret = HRTIMER_RESTART; | |
a0a0c28c | 411 | ++timr->it_requeue_pending; |
1da177e4 | 412 | } |
1da177e4 | 413 | } |
1da177e4 | 414 | |
becf8b5d TG |
415 | unlock_timer(timr, flags); |
416 | return ret; | |
417 | } | |
1da177e4 | 418 | |
27af4245 | 419 | static struct pid *good_sigevent(sigevent_t * event) |
1da177e4 LT |
420 | { |
421 | struct task_struct *rtn = current->group_leader; | |
422 | ||
423 | if ((event->sigev_notify & SIGEV_THREAD_ID ) && | |
8dc86af0 | 424 | (!(rtn = find_task_by_vpid(event->sigev_notify_thread_id)) || |
bac0abd6 | 425 | !same_thread_group(rtn, current) || |
1da177e4 LT |
426 | (event->sigev_notify & ~SIGEV_THREAD_ID) != SIGEV_SIGNAL)) |
427 | return NULL; | |
428 | ||
429 | if (((event->sigev_notify & ~SIGEV_THREAD_ID) != SIGEV_NONE) && | |
430 | ((event->sigev_signo <= 0) || (event->sigev_signo > SIGRTMAX))) | |
431 | return NULL; | |
432 | ||
27af4245 | 433 | return task_pid(rtn); |
1da177e4 LT |
434 | } |
435 | ||
52708737 TG |
436 | void posix_timers_register_clock(const clockid_t clock_id, |
437 | struct k_clock *new_clock) | |
1da177e4 LT |
438 | { |
439 | if ((unsigned) clock_id >= MAX_CLOCKS) { | |
4359ac0a TG |
440 | printk(KERN_WARNING "POSIX clock register failed for clock_id %d\n", |
441 | clock_id); | |
442 | return; | |
443 | } | |
444 | ||
445 | if (!new_clock->clock_get) { | |
446 | printk(KERN_WARNING "POSIX clock id %d lacks clock_get()\n", | |
447 | clock_id); | |
448 | return; | |
449 | } | |
450 | if (!new_clock->clock_getres) { | |
451 | printk(KERN_WARNING "POSIX clock id %d lacks clock_getres()\n", | |
1da177e4 LT |
452 | clock_id); |
453 | return; | |
454 | } | |
455 | ||
456 | posix_clocks[clock_id] = *new_clock; | |
457 | } | |
52708737 | 458 | EXPORT_SYMBOL_GPL(posix_timers_register_clock); |
1da177e4 LT |
459 | |
460 | static struct k_itimer * alloc_posix_timer(void) | |
461 | { | |
462 | struct k_itimer *tmr; | |
c3762229 | 463 | tmr = kmem_cache_zalloc(posix_timers_cache, GFP_KERNEL); |
1da177e4 LT |
464 | if (!tmr) |
465 | return tmr; | |
1da177e4 LT |
466 | if (unlikely(!(tmr->sigq = sigqueue_alloc()))) { |
467 | kmem_cache_free(posix_timers_cache, tmr); | |
aa94fbd5 | 468 | return NULL; |
1da177e4 | 469 | } |
ba661292 | 470 | memset(&tmr->sigq->info, 0, sizeof(siginfo_t)); |
1da177e4 LT |
471 | return tmr; |
472 | } | |
473 | ||
474 | #define IT_ID_SET 1 | |
475 | #define IT_ID_NOT_SET 0 | |
476 | static void release_posix_timer(struct k_itimer *tmr, int it_id_set) | |
477 | { | |
478 | if (it_id_set) { | |
479 | unsigned long flags; | |
480 | spin_lock_irqsave(&idr_lock, flags); | |
481 | idr_remove(&posix_timers_id, tmr->it_id); | |
482 | spin_unlock_irqrestore(&idr_lock, flags); | |
483 | } | |
89992102 | 484 | put_pid(tmr->it_pid); |
1da177e4 | 485 | sigqueue_free(tmr->sigq); |
1da177e4 LT |
486 | kmem_cache_free(posix_timers_cache, tmr); |
487 | } | |
488 | ||
cc785ac2 TG |
489 | static struct k_clock *clockid_to_kclock(const clockid_t id) |
490 | { | |
491 | if (id < 0) | |
81e294cb | 492 | return (id & CLOCKFD_MASK) == CLOCKFD ? NULL : &clock_posix_cpu; |
cc785ac2 TG |
493 | |
494 | if (id >= MAX_CLOCKS || !posix_clocks[id].clock_getres) | |
495 | return NULL; | |
496 | return &posix_clocks[id]; | |
497 | } | |
498 | ||
838394fb TG |
499 | static int common_timer_create(struct k_itimer *new_timer) |
500 | { | |
501 | hrtimer_init(&new_timer->it.real.timer, new_timer->it_clock, 0); | |
502 | return 0; | |
503 | } | |
504 | ||
1da177e4 LT |
505 | /* Create a POSIX.1b interval timer. */ |
506 | ||
362e9c07 HC |
507 | SYSCALL_DEFINE3(timer_create, const clockid_t, which_clock, |
508 | struct sigevent __user *, timer_event_spec, | |
509 | timer_t __user *, created_timer_id) | |
1da177e4 | 510 | { |
838394fb | 511 | struct k_clock *kc = clockid_to_kclock(which_clock); |
2cd499e3 | 512 | struct k_itimer *new_timer; |
ef864c95 | 513 | int error, new_timer_id; |
1da177e4 LT |
514 | sigevent_t event; |
515 | int it_id_set = IT_ID_NOT_SET; | |
516 | ||
838394fb | 517 | if (!kc) |
1da177e4 | 518 | return -EINVAL; |
838394fb TG |
519 | if (!kc->timer_create) |
520 | return -EOPNOTSUPP; | |
1da177e4 LT |
521 | |
522 | new_timer = alloc_posix_timer(); | |
523 | if (unlikely(!new_timer)) | |
524 | return -EAGAIN; | |
525 | ||
526 | spin_lock_init(&new_timer->it_lock); | |
527 | retry: | |
528 | if (unlikely(!idr_pre_get(&posix_timers_id, GFP_KERNEL))) { | |
529 | error = -EAGAIN; | |
530 | goto out; | |
531 | } | |
532 | spin_lock_irq(&idr_lock); | |
5a51b713 | 533 | error = idr_get_new(&posix_timers_id, new_timer, &new_timer_id); |
1da177e4 | 534 | spin_unlock_irq(&idr_lock); |
ef864c95 ON |
535 | if (error) { |
536 | if (error == -EAGAIN) | |
537 | goto retry; | |
1da177e4 | 538 | /* |
0b0a3e7b | 539 | * Weird looking, but we return EAGAIN if the IDR is |
1da177e4 LT |
540 | * full (proper POSIX return value for this) |
541 | */ | |
542 | error = -EAGAIN; | |
543 | goto out; | |
544 | } | |
545 | ||
546 | it_id_set = IT_ID_SET; | |
547 | new_timer->it_id = (timer_t) new_timer_id; | |
548 | new_timer->it_clock = which_clock; | |
549 | new_timer->it_overrun = -1; | |
1da177e4 | 550 | |
1da177e4 LT |
551 | if (timer_event_spec) { |
552 | if (copy_from_user(&event, timer_event_spec, sizeof (event))) { | |
553 | error = -EFAULT; | |
554 | goto out; | |
555 | } | |
36b2f046 | 556 | rcu_read_lock(); |
89992102 | 557 | new_timer->it_pid = get_pid(good_sigevent(&event)); |
36b2f046 | 558 | rcu_read_unlock(); |
89992102 | 559 | if (!new_timer->it_pid) { |
1da177e4 LT |
560 | error = -EINVAL; |
561 | goto out; | |
562 | } | |
563 | } else { | |
5a9fa730 ON |
564 | event.sigev_notify = SIGEV_SIGNAL; |
565 | event.sigev_signo = SIGALRM; | |
566 | event.sigev_value.sival_int = new_timer->it_id; | |
89992102 | 567 | new_timer->it_pid = get_pid(task_tgid(current)); |
1da177e4 LT |
568 | } |
569 | ||
5a9fa730 ON |
570 | new_timer->it_sigev_notify = event.sigev_notify; |
571 | new_timer->sigq->info.si_signo = event.sigev_signo; | |
572 | new_timer->sigq->info.si_value = event.sigev_value; | |
717835d9 | 573 | new_timer->sigq->info.si_tid = new_timer->it_id; |
5a9fa730 | 574 | new_timer->sigq->info.si_code = SI_TIMER; |
717835d9 | 575 | |
2b08de00 AV |
576 | if (copy_to_user(created_timer_id, |
577 | &new_timer_id, sizeof (new_timer_id))) { | |
578 | error = -EFAULT; | |
579 | goto out; | |
580 | } | |
581 | ||
838394fb | 582 | error = kc->timer_create(new_timer); |
45e0fffc AV |
583 | if (error) |
584 | goto out; | |
585 | ||
36b2f046 | 586 | spin_lock_irq(¤t->sighand->siglock); |
27af4245 | 587 | new_timer->it_signal = current->signal; |
36b2f046 ON |
588 | list_add(&new_timer->list, ¤t->signal->posix_timers); |
589 | spin_unlock_irq(¤t->sighand->siglock); | |
ef864c95 ON |
590 | |
591 | return 0; | |
838394fb | 592 | /* |
1da177e4 LT |
593 | * In the case of the timer belonging to another task, after |
594 | * the task is unlocked, the timer is owned by the other task | |
595 | * and may cease to exist at any time. Don't use or modify | |
596 | * new_timer after the unlock call. | |
597 | */ | |
1da177e4 | 598 | out: |
ef864c95 | 599 | release_posix_timer(new_timer, it_id_set); |
1da177e4 LT |
600 | return error; |
601 | } | |
602 | ||
1da177e4 LT |
603 | /* |
604 | * Locking issues: We need to protect the result of the id look up until | |
605 | * we get the timer locked down so it is not deleted under us. The | |
606 | * removal is done under the idr spinlock so we use that here to bridge | |
607 | * the find to the timer lock. To avoid a dead lock, the timer id MUST | |
608 | * be release with out holding the timer lock. | |
609 | */ | |
20f33a03 | 610 | static struct k_itimer *__lock_timer(timer_t timer_id, unsigned long *flags) |
1da177e4 LT |
611 | { |
612 | struct k_itimer *timr; | |
613 | /* | |
614 | * Watch out here. We do a irqsave on the idr_lock and pass the | |
615 | * flags part over to the timer lock. Must not let interrupts in | |
616 | * while we are moving the lock. | |
617 | */ | |
1da177e4 | 618 | spin_lock_irqsave(&idr_lock, *flags); |
31d92845 | 619 | timr = idr_find(&posix_timers_id, (int)timer_id); |
1da177e4 LT |
620 | if (timr) { |
621 | spin_lock(&timr->it_lock); | |
89992102 | 622 | if (timr->it_signal == current->signal) { |
179394af | 623 | spin_unlock(&idr_lock); |
31d92845 ON |
624 | return timr; |
625 | } | |
626 | spin_unlock(&timr->it_lock); | |
627 | } | |
628 | spin_unlock_irqrestore(&idr_lock, *flags); | |
1da177e4 | 629 | |
31d92845 | 630 | return NULL; |
1da177e4 LT |
631 | } |
632 | ||
633 | /* | |
634 | * Get the time remaining on a POSIX.1b interval timer. This function | |
635 | * is ALWAYS called with spin_lock_irq on the timer, thus it must not | |
636 | * mess with irq. | |
637 | * | |
638 | * We have a couple of messes to clean up here. First there is the case | |
639 | * of a timer that has a requeue pending. These timers should appear to | |
640 | * be in the timer list with an expiry as if we were to requeue them | |
641 | * now. | |
642 | * | |
643 | * The second issue is the SIGEV_NONE timer which may be active but is | |
644 | * not really ever put in the timer list (to save system resources). | |
645 | * This timer may be expired, and if so, we will do it here. Otherwise | |
646 | * it is the same as a requeue pending timer WRT to what we should | |
647 | * report. | |
648 | */ | |
649 | static void | |
650 | common_timer_get(struct k_itimer *timr, struct itimerspec *cur_setting) | |
651 | { | |
3b98a532 | 652 | ktime_t now, remaining, iv; |
becf8b5d | 653 | struct hrtimer *timer = &timr->it.real.timer; |
1da177e4 | 654 | |
becf8b5d | 655 | memset(cur_setting, 0, sizeof(struct itimerspec)); |
becf8b5d | 656 | |
3b98a532 RZ |
657 | iv = timr->it.real.interval; |
658 | ||
becf8b5d | 659 | /* interval timer ? */ |
3b98a532 RZ |
660 | if (iv.tv64) |
661 | cur_setting->it_interval = ktime_to_timespec(iv); | |
662 | else if (!hrtimer_active(timer) && | |
663 | (timr->it_sigev_notify & ~SIGEV_THREAD_ID) != SIGEV_NONE) | |
becf8b5d | 664 | return; |
3b98a532 RZ |
665 | |
666 | now = timer->base->get_time(); | |
667 | ||
becf8b5d | 668 | /* |
3b98a532 RZ |
669 | * When a requeue is pending or this is a SIGEV_NONE |
670 | * timer move the expiry time forward by intervals, so | |
671 | * expiry is > now. | |
becf8b5d | 672 | */ |
3b98a532 RZ |
673 | if (iv.tv64 && (timr->it_requeue_pending & REQUEUE_PENDING || |
674 | (timr->it_sigev_notify & ~SIGEV_THREAD_ID) == SIGEV_NONE)) | |
4d672e7a | 675 | timr->it_overrun += (unsigned int) hrtimer_forward(timer, now, iv); |
3b98a532 | 676 | |
cc584b21 | 677 | remaining = ktime_sub(hrtimer_get_expires(timer), now); |
becf8b5d | 678 | /* Return 0 only, when the timer is expired and not pending */ |
3b98a532 RZ |
679 | if (remaining.tv64 <= 0) { |
680 | /* | |
681 | * A single shot SIGEV_NONE timer must return 0, when | |
682 | * it is expired ! | |
683 | */ | |
684 | if ((timr->it_sigev_notify & ~SIGEV_THREAD_ID) != SIGEV_NONE) | |
685 | cur_setting->it_value.tv_nsec = 1; | |
686 | } else | |
becf8b5d | 687 | cur_setting->it_value = ktime_to_timespec(remaining); |
1da177e4 LT |
688 | } |
689 | ||
690 | /* Get the time remaining on a POSIX.1b interval timer. */ | |
362e9c07 HC |
691 | SYSCALL_DEFINE2(timer_gettime, timer_t, timer_id, |
692 | struct itimerspec __user *, setting) | |
1da177e4 | 693 | { |
1da177e4 | 694 | struct itimerspec cur_setting; |
a7319fa2 TG |
695 | struct k_itimer *timr; |
696 | struct k_clock *kc; | |
1da177e4 | 697 | unsigned long flags; |
a7319fa2 | 698 | int ret = 0; |
1da177e4 LT |
699 | |
700 | timr = lock_timer(timer_id, &flags); | |
701 | if (!timr) | |
702 | return -EINVAL; | |
703 | ||
a7319fa2 TG |
704 | kc = clockid_to_kclock(timr->it_clock); |
705 | if (WARN_ON_ONCE(!kc || !kc->timer_get)) | |
706 | ret = -EINVAL; | |
707 | else | |
708 | kc->timer_get(timr, &cur_setting); | |
1da177e4 LT |
709 | |
710 | unlock_timer(timr, flags); | |
711 | ||
a7319fa2 | 712 | if (!ret && copy_to_user(setting, &cur_setting, sizeof (cur_setting))) |
1da177e4 LT |
713 | return -EFAULT; |
714 | ||
a7319fa2 | 715 | return ret; |
1da177e4 | 716 | } |
becf8b5d | 717 | |
1da177e4 LT |
718 | /* |
719 | * Get the number of overruns of a POSIX.1b interval timer. This is to | |
720 | * be the overrun of the timer last delivered. At the same time we are | |
721 | * accumulating overruns on the next timer. The overrun is frozen when | |
722 | * the signal is delivered, either at the notify time (if the info block | |
723 | * is not queued) or at the actual delivery time (as we are informed by | |
724 | * the call back to do_schedule_next_timer(). So all we need to do is | |
725 | * to pick up the frozen overrun. | |
726 | */ | |
362e9c07 | 727 | SYSCALL_DEFINE1(timer_getoverrun, timer_t, timer_id) |
1da177e4 LT |
728 | { |
729 | struct k_itimer *timr; | |
730 | int overrun; | |
5ba25331 | 731 | unsigned long flags; |
1da177e4 LT |
732 | |
733 | timr = lock_timer(timer_id, &flags); | |
734 | if (!timr) | |
735 | return -EINVAL; | |
736 | ||
737 | overrun = timr->it_overrun_last; | |
738 | unlock_timer(timr, flags); | |
739 | ||
740 | return overrun; | |
741 | } | |
1da177e4 LT |
742 | |
743 | /* Set a POSIX.1b interval timer. */ | |
744 | /* timr->it_lock is taken. */ | |
858119e1 | 745 | static int |
1da177e4 LT |
746 | common_timer_set(struct k_itimer *timr, int flags, |
747 | struct itimerspec *new_setting, struct itimerspec *old_setting) | |
748 | { | |
becf8b5d | 749 | struct hrtimer *timer = &timr->it.real.timer; |
7978672c | 750 | enum hrtimer_mode mode; |
1da177e4 LT |
751 | |
752 | if (old_setting) | |
753 | common_timer_get(timr, old_setting); | |
754 | ||
755 | /* disable the timer */ | |
becf8b5d | 756 | timr->it.real.interval.tv64 = 0; |
1da177e4 LT |
757 | /* |
758 | * careful here. If smp we could be in the "fire" routine which will | |
759 | * be spinning as we hold the lock. But this is ONLY an SMP issue. | |
760 | */ | |
becf8b5d | 761 | if (hrtimer_try_to_cancel(timer) < 0) |
1da177e4 | 762 | return TIMER_RETRY; |
1da177e4 LT |
763 | |
764 | timr->it_requeue_pending = (timr->it_requeue_pending + 2) & | |
765 | ~REQUEUE_PENDING; | |
766 | timr->it_overrun_last = 0; | |
1da177e4 | 767 | |
becf8b5d TG |
768 | /* switch off the timer when it_value is zero */ |
769 | if (!new_setting->it_value.tv_sec && !new_setting->it_value.tv_nsec) | |
770 | return 0; | |
1da177e4 | 771 | |
c9cb2e3d | 772 | mode = flags & TIMER_ABSTIME ? HRTIMER_MODE_ABS : HRTIMER_MODE_REL; |
7978672c | 773 | hrtimer_init(&timr->it.real.timer, timr->it_clock, mode); |
7978672c | 774 | timr->it.real.timer.function = posix_timer_fn; |
becf8b5d | 775 | |
cc584b21 | 776 | hrtimer_set_expires(timer, timespec_to_ktime(new_setting->it_value)); |
becf8b5d TG |
777 | |
778 | /* Convert interval */ | |
779 | timr->it.real.interval = timespec_to_ktime(new_setting->it_interval); | |
780 | ||
781 | /* SIGEV_NONE timers are not queued ! See common_timer_get */ | |
952bbc87 TG |
782 | if (((timr->it_sigev_notify & ~SIGEV_THREAD_ID) == SIGEV_NONE)) { |
783 | /* Setup correct expiry time for relative timers */ | |
5a7780e7 | 784 | if (mode == HRTIMER_MODE_REL) { |
cc584b21 | 785 | hrtimer_add_expires(timer, timer->base->get_time()); |
5a7780e7 | 786 | } |
becf8b5d | 787 | return 0; |
952bbc87 | 788 | } |
becf8b5d | 789 | |
cc584b21 | 790 | hrtimer_start_expires(timer, mode); |
1da177e4 LT |
791 | return 0; |
792 | } | |
793 | ||
794 | /* Set a POSIX.1b interval timer */ | |
362e9c07 HC |
795 | SYSCALL_DEFINE4(timer_settime, timer_t, timer_id, int, flags, |
796 | const struct itimerspec __user *, new_setting, | |
797 | struct itimerspec __user *, old_setting) | |
1da177e4 LT |
798 | { |
799 | struct k_itimer *timr; | |
800 | struct itimerspec new_spec, old_spec; | |
801 | int error = 0; | |
5ba25331 | 802 | unsigned long flag; |
1da177e4 | 803 | struct itimerspec *rtn = old_setting ? &old_spec : NULL; |
27722df1 | 804 | struct k_clock *kc; |
1da177e4 LT |
805 | |
806 | if (!new_setting) | |
807 | return -EINVAL; | |
808 | ||
809 | if (copy_from_user(&new_spec, new_setting, sizeof (new_spec))) | |
810 | return -EFAULT; | |
811 | ||
becf8b5d TG |
812 | if (!timespec_valid(&new_spec.it_interval) || |
813 | !timespec_valid(&new_spec.it_value)) | |
1da177e4 LT |
814 | return -EINVAL; |
815 | retry: | |
816 | timr = lock_timer(timer_id, &flag); | |
817 | if (!timr) | |
818 | return -EINVAL; | |
819 | ||
27722df1 TG |
820 | kc = clockid_to_kclock(timr->it_clock); |
821 | if (WARN_ON_ONCE(!kc || !kc->timer_set)) | |
822 | error = -EINVAL; | |
823 | else | |
824 | error = kc->timer_set(timr, flags, &new_spec, rtn); | |
1da177e4 LT |
825 | |
826 | unlock_timer(timr, flag); | |
827 | if (error == TIMER_RETRY) { | |
828 | rtn = NULL; // We already got the old time... | |
829 | goto retry; | |
830 | } | |
831 | ||
becf8b5d TG |
832 | if (old_setting && !error && |
833 | copy_to_user(old_setting, &old_spec, sizeof (old_spec))) | |
1da177e4 LT |
834 | error = -EFAULT; |
835 | ||
836 | return error; | |
837 | } | |
838 | ||
6761c670 | 839 | static int common_timer_del(struct k_itimer *timer) |
1da177e4 | 840 | { |
becf8b5d | 841 | timer->it.real.interval.tv64 = 0; |
f972be33 | 842 | |
becf8b5d | 843 | if (hrtimer_try_to_cancel(&timer->it.real.timer) < 0) |
1da177e4 | 844 | return TIMER_RETRY; |
1da177e4 LT |
845 | return 0; |
846 | } | |
847 | ||
848 | static inline int timer_delete_hook(struct k_itimer *timer) | |
849 | { | |
6761c670 TG |
850 | struct k_clock *kc = clockid_to_kclock(timer->it_clock); |
851 | ||
852 | if (WARN_ON_ONCE(!kc || !kc->timer_del)) | |
853 | return -EINVAL; | |
854 | return kc->timer_del(timer); | |
1da177e4 LT |
855 | } |
856 | ||
857 | /* Delete a POSIX.1b interval timer. */ | |
362e9c07 | 858 | SYSCALL_DEFINE1(timer_delete, timer_t, timer_id) |
1da177e4 LT |
859 | { |
860 | struct k_itimer *timer; | |
5ba25331 | 861 | unsigned long flags; |
1da177e4 | 862 | |
1da177e4 | 863 | retry_delete: |
1da177e4 LT |
864 | timer = lock_timer(timer_id, &flags); |
865 | if (!timer) | |
866 | return -EINVAL; | |
867 | ||
becf8b5d | 868 | if (timer_delete_hook(timer) == TIMER_RETRY) { |
1da177e4 LT |
869 | unlock_timer(timer, flags); |
870 | goto retry_delete; | |
871 | } | |
becf8b5d | 872 | |
1da177e4 LT |
873 | spin_lock(¤t->sighand->siglock); |
874 | list_del(&timer->list); | |
875 | spin_unlock(¤t->sighand->siglock); | |
876 | /* | |
877 | * This keeps any tasks waiting on the spin lock from thinking | |
878 | * they got something (see the lock code above). | |
879 | */ | |
89992102 | 880 | timer->it_signal = NULL; |
4b7a1304 | 881 | |
1da177e4 LT |
882 | unlock_timer(timer, flags); |
883 | release_posix_timer(timer, IT_ID_SET); | |
884 | return 0; | |
885 | } | |
becf8b5d | 886 | |
1da177e4 LT |
887 | /* |
888 | * return timer owned by the process, used by exit_itimers | |
889 | */ | |
858119e1 | 890 | static void itimer_delete(struct k_itimer *timer) |
1da177e4 LT |
891 | { |
892 | unsigned long flags; | |
893 | ||
1da177e4 | 894 | retry_delete: |
1da177e4 LT |
895 | spin_lock_irqsave(&timer->it_lock, flags); |
896 | ||
becf8b5d | 897 | if (timer_delete_hook(timer) == TIMER_RETRY) { |
1da177e4 LT |
898 | unlock_timer(timer, flags); |
899 | goto retry_delete; | |
900 | } | |
1da177e4 LT |
901 | list_del(&timer->list); |
902 | /* | |
903 | * This keeps any tasks waiting on the spin lock from thinking | |
904 | * they got something (see the lock code above). | |
905 | */ | |
89992102 | 906 | timer->it_signal = NULL; |
4b7a1304 | 907 | |
1da177e4 LT |
908 | unlock_timer(timer, flags); |
909 | release_posix_timer(timer, IT_ID_SET); | |
910 | } | |
911 | ||
912 | /* | |
25f407f0 | 913 | * This is called by do_exit or de_thread, only when there are no more |
1da177e4 LT |
914 | * references to the shared signal_struct. |
915 | */ | |
916 | void exit_itimers(struct signal_struct *sig) | |
917 | { | |
918 | struct k_itimer *tmr; | |
919 | ||
920 | while (!list_empty(&sig->posix_timers)) { | |
921 | tmr = list_entry(sig->posix_timers.next, struct k_itimer, list); | |
922 | itimer_delete(tmr); | |
923 | } | |
924 | } | |
925 | ||
362e9c07 HC |
926 | SYSCALL_DEFINE2(clock_settime, const clockid_t, which_clock, |
927 | const struct timespec __user *, tp) | |
1da177e4 | 928 | { |
26f9a479 | 929 | struct k_clock *kc = clockid_to_kclock(which_clock); |
1da177e4 LT |
930 | struct timespec new_tp; |
931 | ||
26f9a479 | 932 | if (!kc || !kc->clock_set) |
1da177e4 | 933 | return -EINVAL; |
26f9a479 | 934 | |
1da177e4 LT |
935 | if (copy_from_user(&new_tp, tp, sizeof (*tp))) |
936 | return -EFAULT; | |
937 | ||
26f9a479 | 938 | return kc->clock_set(which_clock, &new_tp); |
1da177e4 LT |
939 | } |
940 | ||
362e9c07 HC |
941 | SYSCALL_DEFINE2(clock_gettime, const clockid_t, which_clock, |
942 | struct timespec __user *,tp) | |
1da177e4 | 943 | { |
42285777 | 944 | struct k_clock *kc = clockid_to_kclock(which_clock); |
1da177e4 LT |
945 | struct timespec kernel_tp; |
946 | int error; | |
947 | ||
42285777 | 948 | if (!kc) |
1da177e4 | 949 | return -EINVAL; |
42285777 TG |
950 | |
951 | error = kc->clock_get(which_clock, &kernel_tp); | |
952 | ||
1da177e4 LT |
953 | if (!error && copy_to_user(tp, &kernel_tp, sizeof (kernel_tp))) |
954 | error = -EFAULT; | |
955 | ||
956 | return error; | |
1da177e4 LT |
957 | } |
958 | ||
f1f1d5eb RC |
959 | SYSCALL_DEFINE2(clock_adjtime, const clockid_t, which_clock, |
960 | struct timex __user *, utx) | |
961 | { | |
962 | struct k_clock *kc = clockid_to_kclock(which_clock); | |
963 | struct timex ktx; | |
964 | int err; | |
965 | ||
966 | if (!kc) | |
967 | return -EINVAL; | |
968 | if (!kc->clock_adj) | |
969 | return -EOPNOTSUPP; | |
970 | ||
971 | if (copy_from_user(&ktx, utx, sizeof(ktx))) | |
972 | return -EFAULT; | |
973 | ||
974 | err = kc->clock_adj(which_clock, &ktx); | |
975 | ||
976 | if (!err && copy_to_user(utx, &ktx, sizeof(ktx))) | |
977 | return -EFAULT; | |
978 | ||
979 | return err; | |
980 | } | |
981 | ||
362e9c07 HC |
982 | SYSCALL_DEFINE2(clock_getres, const clockid_t, which_clock, |
983 | struct timespec __user *, tp) | |
1da177e4 | 984 | { |
e5e542ee | 985 | struct k_clock *kc = clockid_to_kclock(which_clock); |
1da177e4 LT |
986 | struct timespec rtn_tp; |
987 | int error; | |
988 | ||
e5e542ee | 989 | if (!kc) |
1da177e4 LT |
990 | return -EINVAL; |
991 | ||
e5e542ee | 992 | error = kc->clock_getres(which_clock, &rtn_tp); |
1da177e4 | 993 | |
e5e542ee | 994 | if (!error && tp && copy_to_user(tp, &rtn_tp, sizeof (rtn_tp))) |
1da177e4 | 995 | error = -EFAULT; |
1da177e4 LT |
996 | |
997 | return error; | |
998 | } | |
999 | ||
97735f25 TG |
1000 | /* |
1001 | * nanosleep for monotonic and realtime clocks | |
1002 | */ | |
1003 | static int common_nsleep(const clockid_t which_clock, int flags, | |
1004 | struct timespec *tsave, struct timespec __user *rmtp) | |
1005 | { | |
080344b9 ON |
1006 | return hrtimer_nanosleep(tsave, rmtp, flags & TIMER_ABSTIME ? |
1007 | HRTIMER_MODE_ABS : HRTIMER_MODE_REL, | |
1008 | which_clock); | |
97735f25 | 1009 | } |
1da177e4 | 1010 | |
362e9c07 HC |
1011 | SYSCALL_DEFINE4(clock_nanosleep, const clockid_t, which_clock, int, flags, |
1012 | const struct timespec __user *, rqtp, | |
1013 | struct timespec __user *, rmtp) | |
1da177e4 | 1014 | { |
a5cd2880 | 1015 | struct k_clock *kc = clockid_to_kclock(which_clock); |
1da177e4 | 1016 | struct timespec t; |
1da177e4 | 1017 | |
a5cd2880 | 1018 | if (!kc) |
1da177e4 | 1019 | return -EINVAL; |
a5cd2880 TG |
1020 | if (!kc->nsleep) |
1021 | return -ENANOSLEEP_NOTSUP; | |
1da177e4 LT |
1022 | |
1023 | if (copy_from_user(&t, rqtp, sizeof (struct timespec))) | |
1024 | return -EFAULT; | |
1025 | ||
5f82b2b7 | 1026 | if (!timespec_valid(&t)) |
1da177e4 LT |
1027 | return -EINVAL; |
1028 | ||
a5cd2880 | 1029 | return kc->nsleep(which_clock, flags, &t, rmtp); |
1da177e4 | 1030 | } |
1711ef38 | 1031 | |
1711ef38 TA |
1032 | /* |
1033 | * This will restart clock_nanosleep. This is required only by | |
1034 | * compat_clock_nanosleep_restart for now. | |
1035 | */ | |
59bd5bc2 | 1036 | long clock_nanosleep_restart(struct restart_block *restart_block) |
1711ef38 | 1037 | { |
3751f9f2 | 1038 | clockid_t which_clock = restart_block->nanosleep.index; |
59bd5bc2 TG |
1039 | struct k_clock *kc = clockid_to_kclock(which_clock); |
1040 | ||
1041 | if (WARN_ON_ONCE(!kc || !kc->nsleep_restart)) | |
1042 | return -EINVAL; | |
1711ef38 | 1043 | |
59bd5bc2 | 1044 | return kc->nsleep_restart(restart_block); |
1711ef38 | 1045 | } |