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35728b82 | 1 | // SPDX-License-Identifier: GPL-2.0 |
1da177e4 | 2 | /* |
1da177e4 LT |
3 | * Copyright (C) 1991, 1992 Linus Torvalds |
4 | * | |
58c5fc2b TG |
5 | * This file contains the interface functions for the various time related |
6 | * system calls: time, stime, gettimeofday, settimeofday, adjtime | |
7 | * | |
8 | * Modification history: | |
6fa6c3b1 | 9 | * |
1da177e4 | 10 | * 1993-09-02 Philip Gladstone |
0a0fca9d | 11 | * Created file with time related functions from sched/core.c and adjtimex() |
1da177e4 LT |
12 | * 1993-10-08 Torsten Duwe |
13 | * adjtime interface update and CMOS clock write code | |
14 | * 1995-08-13 Torsten Duwe | |
15 | * kernel PLL updated to 1994-12-13 specs (rfc-1589) | |
16 | * 1999-01-16 Ulrich Windl | |
17 | * Introduced error checking for many cases in adjtimex(). | |
18 | * Updated NTP code according to technical memorandum Jan '96 | |
19 | * "A Kernel Model for Precision Timekeeping" by Dave Mills | |
20 | * Allow time_constant larger than MAXTC(6) for NTP v4 (MAXTC == 10) | |
21 | * (Even though the technical memorandum forbids it) | |
22 | * 2004-07-14 Christoph Lameter | |
23 | * Added getnstimeofday to allow the posix timer functions to return | |
24 | * with nanosecond accuracy | |
25 | */ | |
26 | ||
9984de1a | 27 | #include <linux/export.h> |
abcbcb80 | 28 | #include <linux/kernel.h> |
1da177e4 | 29 | #include <linux/timex.h> |
c59ede7b | 30 | #include <linux/capability.h> |
189374ae | 31 | #include <linux/timekeeper_internal.h> |
1da177e4 | 32 | #include <linux/errno.h> |
1da177e4 LT |
33 | #include <linux/syscalls.h> |
34 | #include <linux/security.h> | |
35 | #include <linux/fs.h> | |
71abb3af | 36 | #include <linux/math64.h> |
e3d5a27d | 37 | #include <linux/ptrace.h> |
1da177e4 | 38 | |
7c0f6ba6 | 39 | #include <linux/uaccess.h> |
3a4d44b6 | 40 | #include <linux/compat.h> |
1da177e4 LT |
41 | #include <asm/unistd.h> |
42 | ||
0a227985 | 43 | #include <generated/timeconst.h> |
8b094cd0 | 44 | #include "timekeeping.h" |
bdc80787 | 45 | |
6fa6c3b1 | 46 | /* |
1da177e4 LT |
47 | * The timezone where the local system is located. Used as a default by some |
48 | * programs who obtain this value by using gettimeofday. | |
49 | */ | |
50 | struct timezone sys_tz; | |
51 | ||
52 | EXPORT_SYMBOL(sys_tz); | |
53 | ||
54 | #ifdef __ARCH_WANT_SYS_TIME | |
55 | ||
56 | /* | |
57 | * sys_time() can be implemented in user-level using | |
58 | * sys_gettimeofday(). Is this for backwards compatibility? If so, | |
59 | * why not move it into the appropriate arch directory (for those | |
60 | * architectures that need it). | |
61 | */ | |
2a785996 | 62 | SYSCALL_DEFINE1(time, __kernel_old_time_t __user *, tloc) |
1da177e4 | 63 | { |
2a785996 | 64 | __kernel_old_time_t i = (__kernel_old_time_t)ktime_get_real_seconds(); |
1da177e4 LT |
65 | |
66 | if (tloc) { | |
20082208 | 67 | if (put_user(i,tloc)) |
e3d5a27d | 68 | return -EFAULT; |
1da177e4 | 69 | } |
e3d5a27d | 70 | force_successful_syscall_return(); |
1da177e4 LT |
71 | return i; |
72 | } | |
73 | ||
74 | /* | |
75 | * sys_stime() can be implemented in user-level using | |
76 | * sys_settimeofday(). Is this for backwards compatibility? If so, | |
77 | * why not move it into the appropriate arch directory (for those | |
78 | * architectures that need it). | |
79 | */ | |
6fa6c3b1 | 80 | |
2a785996 | 81 | SYSCALL_DEFINE1(stime, __kernel_old_time_t __user *, tptr) |
1da177e4 | 82 | { |
4eb1bca1 | 83 | struct timespec64 tv; |
1da177e4 LT |
84 | int err; |
85 | ||
86 | if (get_user(tv.tv_sec, tptr)) | |
87 | return -EFAULT; | |
88 | ||
89 | tv.tv_nsec = 0; | |
90 | ||
4eb1bca1 | 91 | err = security_settime64(&tv, NULL); |
1da177e4 LT |
92 | if (err) |
93 | return err; | |
94 | ||
4eb1bca1 | 95 | do_settimeofday64(&tv); |
1da177e4 LT |
96 | return 0; |
97 | } | |
98 | ||
99 | #endif /* __ARCH_WANT_SYS_TIME */ | |
100 | ||
8dabe724 | 101 | #ifdef CONFIG_COMPAT_32BIT_TIME |
d33c577c | 102 | #ifdef __ARCH_WANT_SYS_TIME32 |
b180db2c | 103 | |
9afc5eee | 104 | /* old_time32_t is a 32 bit "long" and needs to get converted. */ |
8dabe724 | 105 | SYSCALL_DEFINE1(time32, old_time32_t __user *, tloc) |
b180db2c | 106 | { |
9afc5eee | 107 | old_time32_t i; |
b180db2c | 108 | |
9afc5eee | 109 | i = (old_time32_t)ktime_get_real_seconds(); |
b180db2c AV |
110 | |
111 | if (tloc) { | |
112 | if (put_user(i,tloc)) | |
113 | return -EFAULT; | |
114 | } | |
115 | force_successful_syscall_return(); | |
116 | return i; | |
117 | } | |
118 | ||
8dabe724 | 119 | SYSCALL_DEFINE1(stime32, old_time32_t __user *, tptr) |
b180db2c | 120 | { |
4eb1bca1 | 121 | struct timespec64 tv; |
b180db2c AV |
122 | int err; |
123 | ||
124 | if (get_user(tv.tv_sec, tptr)) | |
125 | return -EFAULT; | |
126 | ||
127 | tv.tv_nsec = 0; | |
128 | ||
4eb1bca1 | 129 | err = security_settime64(&tv, NULL); |
b180db2c AV |
130 | if (err) |
131 | return err; | |
132 | ||
4eb1bca1 | 133 | do_settimeofday64(&tv); |
b180db2c AV |
134 | return 0; |
135 | } | |
136 | ||
d33c577c | 137 | #endif /* __ARCH_WANT_SYS_TIME32 */ |
b180db2c AV |
138 | #endif |
139 | ||
75d319c0 | 140 | SYSCALL_DEFINE2(gettimeofday, struct __kernel_old_timeval __user *, tv, |
58fd3aa2 | 141 | struct timezone __user *, tz) |
1da177e4 LT |
142 | { |
143 | if (likely(tv != NULL)) { | |
33e26418 AB |
144 | struct timespec64 ts; |
145 | ||
146 | ktime_get_real_ts64(&ts); | |
147 | if (put_user(ts.tv_sec, &tv->tv_sec) || | |
148 | put_user(ts.tv_nsec / 1000, &tv->tv_usec)) | |
1da177e4 LT |
149 | return -EFAULT; |
150 | } | |
151 | if (unlikely(tz != NULL)) { | |
152 | if (copy_to_user(tz, &sys_tz, sizeof(sys_tz))) | |
153 | return -EFAULT; | |
154 | } | |
155 | return 0; | |
156 | } | |
157 | ||
1da177e4 LT |
158 | /* |
159 | * In case for some reason the CMOS clock has not already been running | |
160 | * in UTC, but in some local time: The first time we set the timezone, | |
161 | * we will warp the clock so that it is ticking UTC time instead of | |
162 | * local time. Presumably, if someone is setting the timezone then we | |
163 | * are running in an environment where the programs understand about | |
164 | * timezones. This should be done at boot time in the /etc/rc script, | |
165 | * as soon as possible, so that the clock can be set right. Otherwise, | |
166 | * various programs will get confused when the clock gets warped. | |
167 | */ | |
168 | ||
86d34732 | 169 | int do_sys_settimeofday64(const struct timespec64 *tv, const struct timezone *tz) |
1da177e4 LT |
170 | { |
171 | static int firsttime = 1; | |
172 | int error = 0; | |
173 | ||
7a8e61f8 | 174 | if (tv && !timespec64_valid_settod(tv)) |
718bcceb TG |
175 | return -EINVAL; |
176 | ||
86d34732 | 177 | error = security_settime64(tv, tz); |
1da177e4 LT |
178 | if (error) |
179 | return error; | |
180 | ||
181 | if (tz) { | |
1d6acc18 | 182 | /* Verify we're within the +-15 hrs range */ |
6f7d7984 SL |
183 | if (tz->tz_minuteswest > 15*60 || tz->tz_minuteswest < -15*60) |
184 | return -EINVAL; | |
185 | ||
1da177e4 | 186 | sys_tz = *tz; |
2c622148 | 187 | update_vsyscall_tz(); |
1da177e4 LT |
188 | if (firsttime) { |
189 | firsttime = 0; | |
190 | if (!tv) | |
e0956dcc | 191 | timekeeping_warp_clock(); |
1da177e4 LT |
192 | } |
193 | } | |
194 | if (tv) | |
86d34732 | 195 | return do_settimeofday64(tv); |
1da177e4 LT |
196 | return 0; |
197 | } | |
198 | ||
5e0fb1b5 | 199 | SYSCALL_DEFINE2(settimeofday, struct __kernel_old_timeval __user *, tv, |
58fd3aa2 | 200 | struct timezone __user *, tz) |
1da177e4 | 201 | { |
2ac00f17 | 202 | struct timespec64 new_ts; |
1da177e4 LT |
203 | struct timezone new_tz; |
204 | ||
205 | if (tv) { | |
5e0fb1b5 AB |
206 | if (get_user(new_ts.tv_sec, &tv->tv_sec) || |
207 | get_user(new_ts.tv_nsec, &tv->tv_usec)) | |
1da177e4 | 208 | return -EFAULT; |
6ada1fc0 | 209 | |
5e0fb1b5 | 210 | if (new_ts.tv_nsec > USEC_PER_SEC || new_ts.tv_nsec < 0) |
6ada1fc0 SL |
211 | return -EINVAL; |
212 | ||
5e0fb1b5 | 213 | new_ts.tv_nsec *= NSEC_PER_USEC; |
1da177e4 LT |
214 | } |
215 | if (tz) { | |
216 | if (copy_from_user(&new_tz, tz, sizeof(*tz))) | |
217 | return -EFAULT; | |
218 | } | |
219 | ||
2ac00f17 | 220 | return do_sys_settimeofday64(tv ? &new_ts : NULL, tz ? &new_tz : NULL); |
1da177e4 LT |
221 | } |
222 | ||
2b2d0285 | 223 | #ifdef CONFIG_COMPAT |
9afc5eee | 224 | COMPAT_SYSCALL_DEFINE2(gettimeofday, struct old_timeval32 __user *, tv, |
2b2d0285 AV |
225 | struct timezone __user *, tz) |
226 | { | |
227 | if (tv) { | |
33e26418 | 228 | struct timespec64 ts; |
2b2d0285 | 229 | |
33e26418 AB |
230 | ktime_get_real_ts64(&ts); |
231 | if (put_user(ts.tv_sec, &tv->tv_sec) || | |
232 | put_user(ts.tv_nsec / 1000, &tv->tv_usec)) | |
2b2d0285 AV |
233 | return -EFAULT; |
234 | } | |
235 | if (tz) { | |
236 | if (copy_to_user(tz, &sys_tz, sizeof(sys_tz))) | |
237 | return -EFAULT; | |
238 | } | |
239 | ||
240 | return 0; | |
241 | } | |
242 | ||
9afc5eee | 243 | COMPAT_SYSCALL_DEFINE2(settimeofday, struct old_timeval32 __user *, tv, |
2b2d0285 AV |
244 | struct timezone __user *, tz) |
245 | { | |
246 | struct timespec64 new_ts; | |
2b2d0285 AV |
247 | struct timezone new_tz; |
248 | ||
249 | if (tv) { | |
5e0fb1b5 AB |
250 | if (get_user(new_ts.tv_sec, &tv->tv_sec) || |
251 | get_user(new_ts.tv_nsec, &tv->tv_usec)) | |
2b2d0285 | 252 | return -EFAULT; |
9176ab1b | 253 | |
5e0fb1b5 | 254 | if (new_ts.tv_nsec > USEC_PER_SEC || new_ts.tv_nsec < 0) |
9176ab1b | 255 | return -EINVAL; |
256 | ||
5e0fb1b5 | 257 | new_ts.tv_nsec *= NSEC_PER_USEC; |
2b2d0285 AV |
258 | } |
259 | if (tz) { | |
260 | if (copy_from_user(&new_tz, tz, sizeof(*tz))) | |
261 | return -EFAULT; | |
262 | } | |
263 | ||
264 | return do_sys_settimeofday64(tv ? &new_ts : NULL, tz ? &new_tz : NULL); | |
265 | } | |
266 | #endif | |
267 | ||
3ca47e95 | 268 | #ifdef CONFIG_64BIT |
3876ced4 | 269 | SYSCALL_DEFINE1(adjtimex, struct __kernel_timex __user *, txc_p) |
1da177e4 | 270 | { |
ead25417 | 271 | struct __kernel_timex txc; /* Local copy of parameter */ |
1da177e4 LT |
272 | int ret; |
273 | ||
274 | /* Copy the user data space into the kernel copy | |
275 | * structure. But bear in mind that the structures | |
276 | * may change | |
277 | */ | |
ead25417 | 278 | if (copy_from_user(&txc, txc_p, sizeof(struct __kernel_timex))) |
1da177e4 LT |
279 | return -EFAULT; |
280 | ret = do_adjtimex(&txc); | |
ead25417 | 281 | return copy_to_user(txc_p, &txc, sizeof(struct __kernel_timex)) ? -EFAULT : ret; |
1da177e4 | 282 | } |
3876ced4 | 283 | #endif |
1da177e4 | 284 | |
4d5f007e | 285 | #ifdef CONFIG_COMPAT_32BIT_TIME |
ead25417 | 286 | int get_old_timex32(struct __kernel_timex *txc, const struct old_timex32 __user *utp) |
4d5f007e AB |
287 | { |
288 | struct old_timex32 tx32; | |
289 | ||
ead25417 | 290 | memset(txc, 0, sizeof(struct __kernel_timex)); |
4d5f007e AB |
291 | if (copy_from_user(&tx32, utp, sizeof(struct old_timex32))) |
292 | return -EFAULT; | |
293 | ||
294 | txc->modes = tx32.modes; | |
295 | txc->offset = tx32.offset; | |
296 | txc->freq = tx32.freq; | |
297 | txc->maxerror = tx32.maxerror; | |
298 | txc->esterror = tx32.esterror; | |
299 | txc->status = tx32.status; | |
300 | txc->constant = tx32.constant; | |
301 | txc->precision = tx32.precision; | |
302 | txc->tolerance = tx32.tolerance; | |
303 | txc->time.tv_sec = tx32.time.tv_sec; | |
304 | txc->time.tv_usec = tx32.time.tv_usec; | |
305 | txc->tick = tx32.tick; | |
306 | txc->ppsfreq = tx32.ppsfreq; | |
307 | txc->jitter = tx32.jitter; | |
308 | txc->shift = tx32.shift; | |
309 | txc->stabil = tx32.stabil; | |
310 | txc->jitcnt = tx32.jitcnt; | |
311 | txc->calcnt = tx32.calcnt; | |
312 | txc->errcnt = tx32.errcnt; | |
313 | txc->stbcnt = tx32.stbcnt; | |
314 | ||
315 | return 0; | |
316 | } | |
317 | ||
ead25417 | 318 | int put_old_timex32(struct old_timex32 __user *utp, const struct __kernel_timex *txc) |
4d5f007e AB |
319 | { |
320 | struct old_timex32 tx32; | |
321 | ||
322 | memset(&tx32, 0, sizeof(struct old_timex32)); | |
323 | tx32.modes = txc->modes; | |
324 | tx32.offset = txc->offset; | |
325 | tx32.freq = txc->freq; | |
326 | tx32.maxerror = txc->maxerror; | |
327 | tx32.esterror = txc->esterror; | |
328 | tx32.status = txc->status; | |
329 | tx32.constant = txc->constant; | |
330 | tx32.precision = txc->precision; | |
331 | tx32.tolerance = txc->tolerance; | |
332 | tx32.time.tv_sec = txc->time.tv_sec; | |
333 | tx32.time.tv_usec = txc->time.tv_usec; | |
334 | tx32.tick = txc->tick; | |
335 | tx32.ppsfreq = txc->ppsfreq; | |
336 | tx32.jitter = txc->jitter; | |
337 | tx32.shift = txc->shift; | |
338 | tx32.stabil = txc->stabil; | |
339 | tx32.jitcnt = txc->jitcnt; | |
340 | tx32.calcnt = txc->calcnt; | |
341 | tx32.errcnt = txc->errcnt; | |
342 | tx32.stbcnt = txc->stbcnt; | |
343 | tx32.tai = txc->tai; | |
344 | if (copy_to_user(utp, &tx32, sizeof(struct old_timex32))) | |
345 | return -EFAULT; | |
346 | return 0; | |
347 | } | |
3a4d44b6 | 348 | |
8dabe724 | 349 | SYSCALL_DEFINE1(adjtimex_time32, struct old_timex32 __user *, utp) |
3a4d44b6 | 350 | { |
ead25417 | 351 | struct __kernel_timex txc; |
3a4d44b6 AV |
352 | int err, ret; |
353 | ||
4d5f007e | 354 | err = get_old_timex32(&txc, utp); |
3a4d44b6 AV |
355 | if (err) |
356 | return err; | |
357 | ||
358 | ret = do_adjtimex(&txc); | |
359 | ||
4d5f007e | 360 | err = put_old_timex32(utp, &txc); |
3a4d44b6 AV |
361 | if (err) |
362 | return err; | |
363 | ||
364 | return ret; | |
365 | } | |
366 | #endif | |
367 | ||
753e9c5c ED |
368 | /* |
369 | * Convert jiffies to milliseconds and back. | |
370 | * | |
371 | * Avoid unnecessary multiplications/divisions in the | |
372 | * two most common HZ cases: | |
373 | */ | |
af3b5628 | 374 | unsigned int jiffies_to_msecs(const unsigned long j) |
753e9c5c ED |
375 | { |
376 | #if HZ <= MSEC_PER_SEC && !(MSEC_PER_SEC % HZ) | |
377 | return (MSEC_PER_SEC / HZ) * j; | |
378 | #elif HZ > MSEC_PER_SEC && !(HZ % MSEC_PER_SEC) | |
379 | return (j + (HZ / MSEC_PER_SEC) - 1)/(HZ / MSEC_PER_SEC); | |
380 | #else | |
bdc80787 | 381 | # if BITS_PER_LONG == 32 |
abcbcb80 GU |
382 | return (HZ_TO_MSEC_MUL32 * j + (1ULL << HZ_TO_MSEC_SHR32) - 1) >> |
383 | HZ_TO_MSEC_SHR32; | |
bdc80787 | 384 | # else |
abcbcb80 | 385 | return DIV_ROUND_UP(j * HZ_TO_MSEC_NUM, HZ_TO_MSEC_DEN); |
bdc80787 | 386 | # endif |
753e9c5c ED |
387 | #endif |
388 | } | |
389 | EXPORT_SYMBOL(jiffies_to_msecs); | |
390 | ||
af3b5628 | 391 | unsigned int jiffies_to_usecs(const unsigned long j) |
753e9c5c | 392 | { |
e0758676 FW |
393 | /* |
394 | * Hz usually doesn't go much further MSEC_PER_SEC. | |
395 | * jiffies_to_usecs() and usecs_to_jiffies() depend on that. | |
396 | */ | |
397 | BUILD_BUG_ON(HZ > USEC_PER_SEC); | |
398 | ||
399 | #if !(USEC_PER_SEC % HZ) | |
753e9c5c | 400 | return (USEC_PER_SEC / HZ) * j; |
753e9c5c | 401 | #else |
bdc80787 | 402 | # if BITS_PER_LONG == 32 |
b9095fd8 | 403 | return (HZ_TO_USEC_MUL32 * j) >> HZ_TO_USEC_SHR32; |
bdc80787 PA |
404 | # else |
405 | return (j * HZ_TO_USEC_NUM) / HZ_TO_USEC_DEN; | |
406 | # endif | |
753e9c5c ED |
407 | #endif |
408 | } | |
409 | EXPORT_SYMBOL(jiffies_to_usecs); | |
410 | ||
90b6ce9c | 411 | /* |
412 | * mktime64 - Converts date to seconds. | |
413 | * Converts Gregorian date to seconds since 1970-01-01 00:00:00. | |
753be622 TG |
414 | * Assumes input in normal date format, i.e. 1980-12-31 23:59:59 |
415 | * => year=1980, mon=12, day=31, hour=23, min=59, sec=59. | |
416 | * | |
417 | * [For the Julian calendar (which was used in Russia before 1917, | |
418 | * Britain & colonies before 1752, anywhere else before 1582, | |
419 | * and is still in use by some communities) leave out the | |
420 | * -year/100+year/400 terms, and add 10.] | |
421 | * | |
422 | * This algorithm was first published by Gauss (I think). | |
ede5147d DH |
423 | * |
424 | * A leap second can be indicated by calling this function with sec as | |
425 | * 60 (allowable under ISO 8601). The leap second is treated the same | |
426 | * as the following second since they don't exist in UNIX time. | |
427 | * | |
428 | * An encoding of midnight at the end of the day as 24:00:00 - ie. midnight | |
429 | * tomorrow - (allowable under ISO 8601) is supported. | |
753be622 | 430 | */ |
90b6ce9c | 431 | time64_t mktime64(const unsigned int year0, const unsigned int mon0, |
432 | const unsigned int day, const unsigned int hour, | |
433 | const unsigned int min, const unsigned int sec) | |
753be622 | 434 | { |
f4818900 IM |
435 | unsigned int mon = mon0, year = year0; |
436 | ||
437 | /* 1..12 -> 11,12,1..10 */ | |
438 | if (0 >= (int) (mon -= 2)) { | |
439 | mon += 12; /* Puts Feb last since it has leap day */ | |
753be622 TG |
440 | year -= 1; |
441 | } | |
442 | ||
90b6ce9c | 443 | return ((((time64_t) |
753be622 TG |
444 | (year/4 - year/100 + year/400 + 367*mon/12 + day) + |
445 | year*365 - 719499 | |
ede5147d | 446 | )*24 + hour /* now have hours - midnight tomorrow handled here */ |
753be622 TG |
447 | )*60 + min /* now have minutes */ |
448 | )*60 + sec; /* finally seconds */ | |
449 | } | |
90b6ce9c | 450 | EXPORT_SYMBOL(mktime64); |
199e7056 | 451 | |
a84d1169 AB |
452 | struct __kernel_old_timeval ns_to_kernel_old_timeval(const s64 nsec) |
453 | { | |
454 | struct timespec64 ts = ns_to_timespec64(nsec); | |
455 | struct __kernel_old_timeval tv; | |
456 | ||
457 | tv.tv_sec = ts.tv_sec; | |
458 | tv.tv_usec = (suseconds_t)ts.tv_nsec / 1000; | |
459 | ||
460 | return tv; | |
461 | } | |
462 | EXPORT_SYMBOL(ns_to_kernel_old_timeval); | |
463 | ||
49cd6f86 JS |
464 | /** |
465 | * set_normalized_timespec - set timespec sec and nsec parts and normalize | |
466 | * | |
467 | * @ts: pointer to timespec variable to be set | |
468 | * @sec: seconds to set | |
469 | * @nsec: nanoseconds to set | |
470 | * | |
471 | * Set seconds and nanoseconds field of a timespec variable and | |
472 | * normalize to the timespec storage format | |
473 | * | |
474 | * Note: The tv_nsec part is always in the range of | |
475 | * 0 <= tv_nsec < NSEC_PER_SEC | |
476 | * For negative values only the tv_sec field is negative ! | |
477 | */ | |
478 | void set_normalized_timespec64(struct timespec64 *ts, time64_t sec, s64 nsec) | |
479 | { | |
480 | while (nsec >= NSEC_PER_SEC) { | |
481 | /* | |
482 | * The following asm() prevents the compiler from | |
483 | * optimising this loop into a modulo operation. See | |
484 | * also __iter_div_u64_rem() in include/linux/time.h | |
485 | */ | |
486 | asm("" : "+rm"(nsec)); | |
487 | nsec -= NSEC_PER_SEC; | |
488 | ++sec; | |
489 | } | |
490 | while (nsec < 0) { | |
491 | asm("" : "+rm"(nsec)); | |
492 | nsec += NSEC_PER_SEC; | |
493 | --sec; | |
494 | } | |
495 | ts->tv_sec = sec; | |
496 | ts->tv_nsec = nsec; | |
497 | } | |
498 | EXPORT_SYMBOL(set_normalized_timespec64); | |
499 | ||
500 | /** | |
501 | * ns_to_timespec64 - Convert nanoseconds to timespec64 | |
502 | * @nsec: the nanoseconds value to be converted | |
503 | * | |
504 | * Returns the timespec64 representation of the nsec parameter. | |
505 | */ | |
506 | struct timespec64 ns_to_timespec64(const s64 nsec) | |
507 | { | |
20d08736 | 508 | struct timespec64 ts = { 0, 0 }; |
49cd6f86 JS |
509 | s32 rem; |
510 | ||
20d08736 AB |
511 | if (likely(nsec > 0)) { |
512 | ts.tv_sec = div_u64_rem(nsec, NSEC_PER_SEC, &rem); | |
513 | ts.tv_nsec = rem; | |
514 | } else if (nsec < 0) { | |
515 | /* | |
516 | * With negative times, tv_sec points to the earlier | |
517 | * second, and tv_nsec counts the nanoseconds since | |
518 | * then, so tv_nsec is always a positive number. | |
519 | */ | |
520 | ts.tv_sec = -div_u64_rem(-nsec - 1, NSEC_PER_SEC, &rem) - 1; | |
521 | ts.tv_nsec = NSEC_PER_SEC - rem - 1; | |
49cd6f86 | 522 | } |
49cd6f86 JS |
523 | |
524 | return ts; | |
525 | } | |
526 | EXPORT_SYMBOL(ns_to_timespec64); | |
abc8f96e | 527 | |
ca42aaf0 NMG |
528 | /** |
529 | * msecs_to_jiffies: - convert milliseconds to jiffies | |
530 | * @m: time in milliseconds | |
531 | * | |
532 | * conversion is done as follows: | |
41cf5445 IM |
533 | * |
534 | * - negative values mean 'infinite timeout' (MAX_JIFFY_OFFSET) | |
535 | * | |
536 | * - 'too large' values [that would result in larger than | |
537 | * MAX_JIFFY_OFFSET values] mean 'infinite timeout' too. | |
538 | * | |
539 | * - all other values are converted to jiffies by either multiplying | |
ca42aaf0 NMG |
540 | * the input value by a factor or dividing it with a factor and |
541 | * handling any 32-bit overflows. | |
542 | * for the details see __msecs_to_jiffies() | |
41cf5445 | 543 | * |
ca42aaf0 NMG |
544 | * msecs_to_jiffies() checks for the passed in value being a constant |
545 | * via __builtin_constant_p() allowing gcc to eliminate most of the | |
546 | * code, __msecs_to_jiffies() is called if the value passed does not | |
547 | * allow constant folding and the actual conversion must be done at | |
548 | * runtime. | |
549 | * the _msecs_to_jiffies helpers are the HZ dependent conversion | |
550 | * routines found in include/linux/jiffies.h | |
41cf5445 | 551 | */ |
ca42aaf0 | 552 | unsigned long __msecs_to_jiffies(const unsigned int m) |
8b9365d7 | 553 | { |
41cf5445 IM |
554 | /* |
555 | * Negative value, means infinite timeout: | |
556 | */ | |
557 | if ((int)m < 0) | |
8b9365d7 | 558 | return MAX_JIFFY_OFFSET; |
ca42aaf0 | 559 | return _msecs_to_jiffies(m); |
8b9365d7 | 560 | } |
ca42aaf0 | 561 | EXPORT_SYMBOL(__msecs_to_jiffies); |
8b9365d7 | 562 | |
ae60d6a0 | 563 | unsigned long __usecs_to_jiffies(const unsigned int u) |
8b9365d7 IM |
564 | { |
565 | if (u > jiffies_to_usecs(MAX_JIFFY_OFFSET)) | |
566 | return MAX_JIFFY_OFFSET; | |
ae60d6a0 | 567 | return _usecs_to_jiffies(u); |
8b9365d7 | 568 | } |
ae60d6a0 | 569 | EXPORT_SYMBOL(__usecs_to_jiffies); |
8b9365d7 IM |
570 | |
571 | /* | |
572 | * The TICK_NSEC - 1 rounds up the value to the next resolution. Note | |
573 | * that a remainder subtract here would not do the right thing as the | |
574 | * resolution values don't fall on second boundries. I.e. the line: | |
575 | * nsec -= nsec % TICK_NSEC; is NOT a correct resolution rounding. | |
d78c9300 AH |
576 | * Note that due to the small error in the multiplier here, this |
577 | * rounding is incorrect for sufficiently large values of tv_nsec, but | |
578 | * well formed timespecs should have tv_nsec < NSEC_PER_SEC, so we're | |
579 | * OK. | |
8b9365d7 IM |
580 | * |
581 | * Rather, we just shift the bits off the right. | |
582 | * | |
583 | * The >> (NSEC_JIFFIE_SC - SEC_JIFFIE_SC) converts the scaled nsec | |
584 | * value to a scaled second value. | |
585 | */ | |
751addac AB |
586 | |
587 | unsigned long | |
588 | timespec64_to_jiffies(const struct timespec64 *value) | |
8b9365d7 | 589 | { |
751addac AB |
590 | u64 sec = value->tv_sec; |
591 | long nsec = value->tv_nsec + TICK_NSEC - 1; | |
8b9365d7 IM |
592 | |
593 | if (sec >= MAX_SEC_IN_JIFFIES){ | |
594 | sec = MAX_SEC_IN_JIFFIES; | |
595 | nsec = 0; | |
596 | } | |
9ca30850 | 597 | return ((sec * SEC_CONVERSION) + |
8b9365d7 IM |
598 | (((u64)nsec * NSEC_CONVERSION) >> |
599 | (NSEC_JIFFIE_SC - SEC_JIFFIE_SC))) >> SEC_JIFFIE_SC; | |
600 | ||
601 | } | |
9ca30850 | 602 | EXPORT_SYMBOL(timespec64_to_jiffies); |
8b9365d7 IM |
603 | |
604 | void | |
9ca30850 | 605 | jiffies_to_timespec64(const unsigned long jiffies, struct timespec64 *value) |
8b9365d7 IM |
606 | { |
607 | /* | |
608 | * Convert jiffies to nanoseconds and separate with | |
609 | * one divide. | |
610 | */ | |
f8bd2258 RZ |
611 | u32 rem; |
612 | value->tv_sec = div_u64_rem((u64)jiffies * TICK_NSEC, | |
613 | NSEC_PER_SEC, &rem); | |
614 | value->tv_nsec = rem; | |
8b9365d7 | 615 | } |
9ca30850 | 616 | EXPORT_SYMBOL(jiffies_to_timespec64); |
8b9365d7 | 617 | |
8b9365d7 IM |
618 | /* |
619 | * Convert jiffies/jiffies_64 to clock_t and back. | |
620 | */ | |
cbbc719f | 621 | clock_t jiffies_to_clock_t(unsigned long x) |
8b9365d7 IM |
622 | { |
623 | #if (TICK_NSEC % (NSEC_PER_SEC / USER_HZ)) == 0 | |
6ffc787a DF |
624 | # if HZ < USER_HZ |
625 | return x * (USER_HZ / HZ); | |
626 | # else | |
8b9365d7 | 627 | return x / (HZ / USER_HZ); |
6ffc787a | 628 | # endif |
8b9365d7 | 629 | #else |
71abb3af | 630 | return div_u64((u64)x * TICK_NSEC, NSEC_PER_SEC / USER_HZ); |
8b9365d7 IM |
631 | #endif |
632 | } | |
633 | EXPORT_SYMBOL(jiffies_to_clock_t); | |
634 | ||
635 | unsigned long clock_t_to_jiffies(unsigned long x) | |
636 | { | |
637 | #if (HZ % USER_HZ)==0 | |
638 | if (x >= ~0UL / (HZ / USER_HZ)) | |
639 | return ~0UL; | |
640 | return x * (HZ / USER_HZ); | |
641 | #else | |
8b9365d7 IM |
642 | /* Don't worry about loss of precision here .. */ |
643 | if (x >= ~0UL / HZ * USER_HZ) | |
644 | return ~0UL; | |
645 | ||
646 | /* .. but do try to contain it here */ | |
71abb3af | 647 | return div_u64((u64)x * HZ, USER_HZ); |
8b9365d7 IM |
648 | #endif |
649 | } | |
650 | EXPORT_SYMBOL(clock_t_to_jiffies); | |
651 | ||
652 | u64 jiffies_64_to_clock_t(u64 x) | |
653 | { | |
654 | #if (TICK_NSEC % (NSEC_PER_SEC / USER_HZ)) == 0 | |
6ffc787a | 655 | # if HZ < USER_HZ |
71abb3af | 656 | x = div_u64(x * USER_HZ, HZ); |
ec03d707 | 657 | # elif HZ > USER_HZ |
71abb3af | 658 | x = div_u64(x, HZ / USER_HZ); |
ec03d707 AM |
659 | # else |
660 | /* Nothing to do */ | |
6ffc787a | 661 | # endif |
8b9365d7 IM |
662 | #else |
663 | /* | |
664 | * There are better ways that don't overflow early, | |
665 | * but even this doesn't overflow in hundreds of years | |
666 | * in 64 bits, so.. | |
667 | */ | |
71abb3af | 668 | x = div_u64(x * TICK_NSEC, (NSEC_PER_SEC / USER_HZ)); |
8b9365d7 IM |
669 | #endif |
670 | return x; | |
671 | } | |
8b9365d7 IM |
672 | EXPORT_SYMBOL(jiffies_64_to_clock_t); |
673 | ||
674 | u64 nsec_to_clock_t(u64 x) | |
675 | { | |
676 | #if (NSEC_PER_SEC % USER_HZ) == 0 | |
71abb3af | 677 | return div_u64(x, NSEC_PER_SEC / USER_HZ); |
8b9365d7 | 678 | #elif (USER_HZ % 512) == 0 |
71abb3af | 679 | return div_u64(x * USER_HZ / 512, NSEC_PER_SEC / 512); |
8b9365d7 IM |
680 | #else |
681 | /* | |
682 | * max relative error 5.7e-8 (1.8s per year) for USER_HZ <= 1024, | |
683 | * overflow after 64.99 years. | |
684 | * exact for HZ=60, 72, 90, 120, 144, 180, 300, 600, 900, ... | |
685 | */ | |
71abb3af | 686 | return div_u64(x * 9, (9ull * NSEC_PER_SEC + (USER_HZ / 2)) / USER_HZ); |
8b9365d7 | 687 | #endif |
8b9365d7 IM |
688 | } |
689 | ||
07e5f5e3 FW |
690 | u64 jiffies64_to_nsecs(u64 j) |
691 | { | |
692 | #if !(NSEC_PER_SEC % HZ) | |
693 | return (NSEC_PER_SEC / HZ) * j; | |
694 | # else | |
695 | return div_u64(j * HZ_TO_NSEC_NUM, HZ_TO_NSEC_DEN); | |
696 | #endif | |
697 | } | |
698 | EXPORT_SYMBOL(jiffies64_to_nsecs); | |
699 | ||
3b15d09f LR |
700 | u64 jiffies64_to_msecs(const u64 j) |
701 | { | |
702 | #if HZ <= MSEC_PER_SEC && !(MSEC_PER_SEC % HZ) | |
703 | return (MSEC_PER_SEC / HZ) * j; | |
704 | #else | |
705 | return div_u64(j * HZ_TO_MSEC_NUM, HZ_TO_MSEC_DEN); | |
706 | #endif | |
707 | } | |
708 | EXPORT_SYMBOL(jiffies64_to_msecs); | |
709 | ||
b7b20df9 | 710 | /** |
a1dabb6b | 711 | * nsecs_to_jiffies64 - Convert nsecs in u64 to jiffies64 |
b7b20df9 HS |
712 | * |
713 | * @n: nsecs in u64 | |
714 | * | |
715 | * Unlike {m,u}secs_to_jiffies, type of input is not unsigned int but u64. | |
716 | * And this doesn't return MAX_JIFFY_OFFSET since this function is designed | |
717 | * for scheduler, not for use in device drivers to calculate timeout value. | |
718 | * | |
719 | * note: | |
720 | * NSEC_PER_SEC = 10^9 = (5^9 * 2^9) = (1953125 * 512) | |
721 | * ULLONG_MAX ns = 18446744073.709551615 secs = about 584 years | |
722 | */ | |
a1dabb6b | 723 | u64 nsecs_to_jiffies64(u64 n) |
b7b20df9 HS |
724 | { |
725 | #if (NSEC_PER_SEC % HZ) == 0 | |
726 | /* Common case, HZ = 100, 128, 200, 250, 256, 500, 512, 1000 etc. */ | |
727 | return div_u64(n, NSEC_PER_SEC / HZ); | |
728 | #elif (HZ % 512) == 0 | |
729 | /* overflow after 292 years if HZ = 1024 */ | |
730 | return div_u64(n * HZ / 512, NSEC_PER_SEC / 512); | |
731 | #else | |
732 | /* | |
733 | * Generic case - optimized for cases where HZ is a multiple of 3. | |
734 | * overflow after 64.99 years, exact for HZ = 60, 72, 90, 120 etc. | |
735 | */ | |
736 | return div_u64(n * 9, (9ull * NSEC_PER_SEC + HZ / 2) / HZ); | |
737 | #endif | |
738 | } | |
7bd0e226 | 739 | EXPORT_SYMBOL(nsecs_to_jiffies64); |
b7b20df9 | 740 | |
a1dabb6b VP |
741 | /** |
742 | * nsecs_to_jiffies - Convert nsecs in u64 to jiffies | |
743 | * | |
744 | * @n: nsecs in u64 | |
745 | * | |
746 | * Unlike {m,u}secs_to_jiffies, type of input is not unsigned int but u64. | |
747 | * And this doesn't return MAX_JIFFY_OFFSET since this function is designed | |
748 | * for scheduler, not for use in device drivers to calculate timeout value. | |
749 | * | |
750 | * note: | |
751 | * NSEC_PER_SEC = 10^9 = (5^9 * 2^9) = (1953125 * 512) | |
752 | * ULLONG_MAX ns = 18446744073.709551615 secs = about 584 years | |
753 | */ | |
754 | unsigned long nsecs_to_jiffies(u64 n) | |
755 | { | |
756 | return (unsigned long)nsecs_to_jiffies64(n); | |
757 | } | |
d560fed6 | 758 | EXPORT_SYMBOL_GPL(nsecs_to_jiffies); |
a1dabb6b | 759 | |
bc2c53e5 DD |
760 | /* |
761 | * Add two timespec64 values and do a safety check for overflow. | |
762 | * It's assumed that both values are valid (>= 0). | |
763 | * And, each timespec64 is in normalized form. | |
764 | */ | |
765 | struct timespec64 timespec64_add_safe(const struct timespec64 lhs, | |
766 | const struct timespec64 rhs) | |
767 | { | |
768 | struct timespec64 res; | |
769 | ||
469e857f | 770 | set_normalized_timespec64(&res, (timeu64_t) lhs.tv_sec + rhs.tv_sec, |
bc2c53e5 DD |
771 | lhs.tv_nsec + rhs.tv_nsec); |
772 | ||
773 | if (unlikely(res.tv_sec < lhs.tv_sec || res.tv_sec < rhs.tv_sec)) { | |
774 | res.tv_sec = TIME64_MAX; | |
775 | res.tv_nsec = 0; | |
776 | } | |
777 | ||
778 | return res; | |
779 | } | |
f59dd9c8 DD |
780 | |
781 | int get_timespec64(struct timespec64 *ts, | |
ea2ce8f3 | 782 | const struct __kernel_timespec __user *uts) |
f59dd9c8 | 783 | { |
ea2ce8f3 | 784 | struct __kernel_timespec kts; |
f59dd9c8 DD |
785 | int ret; |
786 | ||
787 | ret = copy_from_user(&kts, uts, sizeof(kts)); | |
788 | if (ret) | |
789 | return -EFAULT; | |
790 | ||
791 | ts->tv_sec = kts.tv_sec; | |
ea2ce8f3 | 792 | |
043cf468 | 793 | /* Zero out the padding in compat mode */ |
3ca47e95 | 794 | if (in_compat_syscall()) |
ea2ce8f3 DD |
795 | kts.tv_nsec &= 0xFFFFFFFFUL; |
796 | ||
043cf468 | 797 | /* In 32-bit mode, this drops the padding */ |
f59dd9c8 DD |
798 | ts->tv_nsec = kts.tv_nsec; |
799 | ||
800 | return 0; | |
801 | } | |
802 | EXPORT_SYMBOL_GPL(get_timespec64); | |
803 | ||
804 | int put_timespec64(const struct timespec64 *ts, | |
ea2ce8f3 | 805 | struct __kernel_timespec __user *uts) |
f59dd9c8 | 806 | { |
ea2ce8f3 | 807 | struct __kernel_timespec kts = { |
f59dd9c8 DD |
808 | .tv_sec = ts->tv_sec, |
809 | .tv_nsec = ts->tv_nsec | |
810 | }; | |
ea2ce8f3 | 811 | |
f59dd9c8 DD |
812 | return copy_to_user(uts, &kts, sizeof(kts)) ? -EFAULT : 0; |
813 | } | |
814 | EXPORT_SYMBOL_GPL(put_timespec64); | |
d5b7ffbf | 815 | |
743f5cdb | 816 | static int __get_old_timespec32(struct timespec64 *ts64, |
9afc5eee | 817 | const struct old_timespec32 __user *cts) |
1c68adf6 | 818 | { |
9afc5eee | 819 | struct old_timespec32 ts; |
1c68adf6 DD |
820 | int ret; |
821 | ||
822 | ret = copy_from_user(&ts, cts, sizeof(ts)); | |
823 | if (ret) | |
824 | return -EFAULT; | |
825 | ||
826 | ts64->tv_sec = ts.tv_sec; | |
827 | ts64->tv_nsec = ts.tv_nsec; | |
828 | ||
829 | return 0; | |
830 | } | |
831 | ||
743f5cdb | 832 | static int __put_old_timespec32(const struct timespec64 *ts64, |
9afc5eee | 833 | struct old_timespec32 __user *cts) |
1c68adf6 | 834 | { |
9afc5eee | 835 | struct old_timespec32 ts = { |
1c68adf6 DD |
836 | .tv_sec = ts64->tv_sec, |
837 | .tv_nsec = ts64->tv_nsec | |
838 | }; | |
839 | return copy_to_user(cts, &ts, sizeof(ts)) ? -EFAULT : 0; | |
840 | } | |
841 | ||
9afc5eee | 842 | int get_old_timespec32(struct timespec64 *ts, const void __user *uts) |
1c68adf6 DD |
843 | { |
844 | if (COMPAT_USE_64BIT_TIME) | |
845 | return copy_from_user(ts, uts, sizeof(*ts)) ? -EFAULT : 0; | |
846 | else | |
9afc5eee | 847 | return __get_old_timespec32(ts, uts); |
1c68adf6 | 848 | } |
9afc5eee | 849 | EXPORT_SYMBOL_GPL(get_old_timespec32); |
1c68adf6 | 850 | |
9afc5eee | 851 | int put_old_timespec32(const struct timespec64 *ts, void __user *uts) |
1c68adf6 DD |
852 | { |
853 | if (COMPAT_USE_64BIT_TIME) | |
854 | return copy_to_user(uts, ts, sizeof(*ts)) ? -EFAULT : 0; | |
855 | else | |
9afc5eee | 856 | return __put_old_timespec32(ts, uts); |
1c68adf6 | 857 | } |
9afc5eee | 858 | EXPORT_SYMBOL_GPL(put_old_timespec32); |
1c68adf6 | 859 | |
d5b7ffbf | 860 | int get_itimerspec64(struct itimerspec64 *it, |
d0dd63a8 | 861 | const struct __kernel_itimerspec __user *uit) |
d5b7ffbf DD |
862 | { |
863 | int ret; | |
864 | ||
865 | ret = get_timespec64(&it->it_interval, &uit->it_interval); | |
866 | if (ret) | |
867 | return ret; | |
868 | ||
869 | ret = get_timespec64(&it->it_value, &uit->it_value); | |
870 | ||
871 | return ret; | |
872 | } | |
873 | EXPORT_SYMBOL_GPL(get_itimerspec64); | |
874 | ||
875 | int put_itimerspec64(const struct itimerspec64 *it, | |
d0dd63a8 | 876 | struct __kernel_itimerspec __user *uit) |
d5b7ffbf DD |
877 | { |
878 | int ret; | |
879 | ||
880 | ret = put_timespec64(&it->it_interval, &uit->it_interval); | |
881 | if (ret) | |
882 | return ret; | |
883 | ||
884 | ret = put_timespec64(&it->it_value, &uit->it_value); | |
885 | ||
886 | return ret; | |
887 | } | |
888 | EXPORT_SYMBOL_GPL(put_itimerspec64); | |
afef05cf | 889 | |
9afc5eee AB |
890 | int get_old_itimerspec32(struct itimerspec64 *its, |
891 | const struct old_itimerspec32 __user *uits) | |
afef05cf DD |
892 | { |
893 | ||
9afc5eee AB |
894 | if (__get_old_timespec32(&its->it_interval, &uits->it_interval) || |
895 | __get_old_timespec32(&its->it_value, &uits->it_value)) | |
afef05cf DD |
896 | return -EFAULT; |
897 | return 0; | |
898 | } | |
9afc5eee | 899 | EXPORT_SYMBOL_GPL(get_old_itimerspec32); |
afef05cf | 900 | |
9afc5eee AB |
901 | int put_old_itimerspec32(const struct itimerspec64 *its, |
902 | struct old_itimerspec32 __user *uits) | |
afef05cf | 903 | { |
9afc5eee AB |
904 | if (__put_old_timespec32(&its->it_interval, &uits->it_interval) || |
905 | __put_old_timespec32(&its->it_value, &uits->it_value)) | |
afef05cf DD |
906 | return -EFAULT; |
907 | return 0; | |
908 | } | |
9afc5eee | 909 | EXPORT_SYMBOL_GPL(put_old_itimerspec32); |