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Thomas Gleixner35728b82018-10-31 19:21:09 +01001// SPDX-License-Identifier: GPL-2.0
Linus Torvalds1da177e2005-04-16 15:20:36 -07002/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07003 * Copyright (C) 1991, 1992 Linus Torvalds
4 *
Thomas Gleixner58c5fc22018-10-31 19:21:08 +01005 * This file contains the interface functions for the various time related
6 * system calls: time, stime, gettimeofday, settimeofday, adjtime
7 *
8 * Modification history:
Daniel Walker6fa6c3b2007-10-18 03:06:03 -07009 *
Linus Torvalds1da177e2005-04-16 15:20:36 -070010 * 1993-09-02 Philip Gladstone
Viresh Kumar0a0fca92013-06-04 13:10:24 +053011 * Created file with time related functions from sched/core.c and adjtimex()
Linus Torvalds1da177e2005-04-16 15:20:36 -070012 * 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
Paul Gortmaker9984de12011-05-23 14:51:41 -040027#include <linux/export.h>
Geert Uytterhoevenabcbcb82018-06-22 16:33:57 +020028#include <linux/kernel.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070029#include <linux/timex.h>
Randy.Dunlapc59ede72006-01-11 12:17:46 -080030#include <linux/capability.h>
John Stultz189374a2012-09-04 15:27:48 -040031#include <linux/timekeeper_internal.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070032#include <linux/errno.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070033#include <linux/syscalls.h>
34#include <linux/security.h>
35#include <linux/fs.h>
Roman Zippel71abb3a2008-05-01 04:34:26 -070036#include <linux/math64.h>
Paul Mackerrase3d5a272009-01-06 14:41:02 -080037#include <linux/ptrace.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070038
Linus Torvalds7c0f6ba2016-12-24 11:46:01 -080039#include <linux/uaccess.h>
Al Viro3a4d44b2017-06-07 09:42:34 +010040#include <linux/compat.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070041#include <asm/unistd.h>
42
Nicholas Mc Guire0a227982015-05-18 14:19:12 +020043#include <generated/timeconst.h>
Thomas Gleixner8b094cd2014-07-16 21:04:02 +000044#include "timekeeping.h"
H. Peter Anvinbdc80782008-02-08 04:21:26 -080045
Daniel Walker6fa6c3b2007-10-18 03:06:03 -070046/*
Linus Torvalds1da177e2005-04-16 15:20:36 -070047 * The timezone where the local system is located. Used as a default by some
48 * programs who obtain this value by using gettimeofday.
49 */
50struct timezone sys_tz;
51
52EXPORT_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 */
Heiko Carstens58fd3aa2009-01-14 14:14:03 +010062SYSCALL_DEFINE1(time, time_t __user *, tloc)
Linus Torvalds1da177e2005-04-16 15:20:36 -070063{
Arnd Bergmannf5a89292018-06-18 16:08:00 +020064 time_t i = (time_t)ktime_get_real_seconds();
Linus Torvalds1da177e2005-04-16 15:20:36 -070065
66 if (tloc) {
Linus Torvalds20082202007-07-20 13:28:54 -070067 if (put_user(i,tloc))
Paul Mackerrase3d5a272009-01-06 14:41:02 -080068 return -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -070069 }
Paul Mackerrase3d5a272009-01-06 14:41:02 -080070 force_successful_syscall_return();
Linus Torvalds1da177e2005-04-16 15:20:36 -070071 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 */
Daniel Walker6fa6c3b2007-10-18 03:06:03 -070080
Heiko Carstens58fd3aa2009-01-14 14:14:03 +010081SYSCALL_DEFINE1(stime, time_t __user *, tptr)
Linus Torvalds1da177e2005-04-16 15:20:36 -070082{
Arnd Bergmann4eb1bca2017-10-13 20:34:35 +020083 struct timespec64 tv;
Linus Torvalds1da177e2005-04-16 15:20:36 -070084 int err;
85
86 if (get_user(tv.tv_sec, tptr))
87 return -EFAULT;
88
89 tv.tv_nsec = 0;
90
Arnd Bergmann4eb1bca2017-10-13 20:34:35 +020091 err = security_settime64(&tv, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -070092 if (err)
93 return err;
94
Arnd Bergmann4eb1bca2017-10-13 20:34:35 +020095 do_settimeofday64(&tv);
Linus Torvalds1da177e2005-04-16 15:20:36 -070096 return 0;
97}
98
99#endif /* __ARCH_WANT_SYS_TIME */
100
Arnd Bergmann8dabe722019-01-07 00:33:08 +0100101#ifdef CONFIG_COMPAT_32BIT_TIME
Arnd Bergmannd33c5772019-01-06 23:45:29 +0100102#ifdef __ARCH_WANT_SYS_TIME32
Al Virob180db22017-06-07 09:42:40 +0100103
Arnd Bergmann9afc5ee2018-07-13 12:52:28 +0200104/* old_time32_t is a 32 bit "long" and needs to get converted. */
Arnd Bergmann8dabe722019-01-07 00:33:08 +0100105SYSCALL_DEFINE1(time32, old_time32_t __user *, tloc)
Al Virob180db22017-06-07 09:42:40 +0100106{
Arnd Bergmann9afc5ee2018-07-13 12:52:28 +0200107 old_time32_t i;
Al Virob180db22017-06-07 09:42:40 +0100108
Arnd Bergmann9afc5ee2018-07-13 12:52:28 +0200109 i = (old_time32_t)ktime_get_real_seconds();
Al Virob180db22017-06-07 09:42:40 +0100110
111 if (tloc) {
112 if (put_user(i,tloc))
113 return -EFAULT;
114 }
115 force_successful_syscall_return();
116 return i;
117}
118
Arnd Bergmann8dabe722019-01-07 00:33:08 +0100119SYSCALL_DEFINE1(stime32, old_time32_t __user *, tptr)
Al Virob180db22017-06-07 09:42:40 +0100120{
Arnd Bergmann4eb1bca2017-10-13 20:34:35 +0200121 struct timespec64 tv;
Al Virob180db22017-06-07 09:42:40 +0100122 int err;
123
124 if (get_user(tv.tv_sec, tptr))
125 return -EFAULT;
126
127 tv.tv_nsec = 0;
128
Arnd Bergmann4eb1bca2017-10-13 20:34:35 +0200129 err = security_settime64(&tv, NULL);
Al Virob180db22017-06-07 09:42:40 +0100130 if (err)
131 return err;
132
Arnd Bergmann4eb1bca2017-10-13 20:34:35 +0200133 do_settimeofday64(&tv);
Al Virob180db22017-06-07 09:42:40 +0100134 return 0;
135}
136
Arnd Bergmannd33c5772019-01-06 23:45:29 +0100137#endif /* __ARCH_WANT_SYS_TIME32 */
Al Virob180db22017-06-07 09:42:40 +0100138#endif
139
Heiko Carstens58fd3aa2009-01-14 14:14:03 +0100140SYSCALL_DEFINE2(gettimeofday, struct timeval __user *, tv,
141 struct timezone __user *, tz)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142{
143 if (likely(tv != NULL)) {
Arnd Bergmann33e26412018-08-14 15:18:20 +0200144 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))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700149 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
158/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159 * 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
Baolin Wang86d34732016-04-08 14:02:12 +0800169int do_sys_settimeofday64(const struct timespec64 *tv, const struct timezone *tz)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170{
171 static int firsttime = 1;
172 int error = 0;
173
Thomas Gleixner7a8e61f2019-03-23 11:36:19 +0100174 if (tv && !timespec64_valid_settod(tv))
Thomas Gleixner718bcce2006-01-09 20:52:29 -0800175 return -EINVAL;
176
Baolin Wang86d34732016-04-08 14:02:12 +0800177 error = security_settime64(tv, tz);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700178 if (error)
179 return error;
180
181 if (tz) {
Sasha Levin6f7d7982014-12-01 23:04:06 -0500182 /* Verify we're witin the +-15 hrs range */
183 if (tz->tz_minuteswest > 15*60 || tz->tz_minuteswest < -15*60)
184 return -EINVAL;
185
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186 sys_tz = *tz;
Tony Breeds2c622142007-10-18 03:04:57 -0700187 update_vsyscall_tz();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700188 if (firsttime) {
189 firsttime = 0;
190 if (!tv)
Arnd Bergmanne0956dc2017-10-19 13:14:44 +0200191 timekeeping_warp_clock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192 }
193 }
194 if (tv)
Baolin Wang86d34732016-04-08 14:02:12 +0800195 return do_settimeofday64(tv);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700196 return 0;
197}
198
Heiko Carstens58fd3aa2009-01-14 14:14:03 +0100199SYSCALL_DEFINE2(settimeofday, struct timeval __user *, tv,
200 struct timezone __user *, tz)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201{
Deepa Dinamani2ac00f12017-03-26 12:04:12 -0700202 struct timespec64 new_ts;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203 struct timeval user_tv;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700204 struct timezone new_tz;
205
206 if (tv) {
207 if (copy_from_user(&user_tv, tv, sizeof(*tv)))
208 return -EFAULT;
Sasha Levin6ada1fc2014-12-03 19:22:48 -0500209
210 if (!timeval_valid(&user_tv))
211 return -EINVAL;
212
Linus Torvalds1da177e2005-04-16 15:20:36 -0700213 new_ts.tv_sec = user_tv.tv_sec;
214 new_ts.tv_nsec = user_tv.tv_usec * NSEC_PER_USEC;
215 }
216 if (tz) {
217 if (copy_from_user(&new_tz, tz, sizeof(*tz)))
218 return -EFAULT;
219 }
220
Deepa Dinamani2ac00f12017-03-26 12:04:12 -0700221 return do_sys_settimeofday64(tv ? &new_ts : NULL, tz ? &new_tz : NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700222}
223
Al Viro2b2d0282017-06-07 09:42:41 +0100224#ifdef CONFIG_COMPAT
Arnd Bergmann9afc5ee2018-07-13 12:52:28 +0200225COMPAT_SYSCALL_DEFINE2(gettimeofday, struct old_timeval32 __user *, tv,
Al Viro2b2d0282017-06-07 09:42:41 +0100226 struct timezone __user *, tz)
227{
228 if (tv) {
Arnd Bergmann33e26412018-08-14 15:18:20 +0200229 struct timespec64 ts;
Al Viro2b2d0282017-06-07 09:42:41 +0100230
Arnd Bergmann33e26412018-08-14 15:18:20 +0200231 ktime_get_real_ts64(&ts);
232 if (put_user(ts.tv_sec, &tv->tv_sec) ||
233 put_user(ts.tv_nsec / 1000, &tv->tv_usec))
Al Viro2b2d0282017-06-07 09:42:41 +0100234 return -EFAULT;
235 }
236 if (tz) {
237 if (copy_to_user(tz, &sys_tz, sizeof(sys_tz)))
238 return -EFAULT;
239 }
240
241 return 0;
242}
243
Arnd Bergmann9afc5ee2018-07-13 12:52:28 +0200244COMPAT_SYSCALL_DEFINE2(settimeofday, struct old_timeval32 __user *, tv,
Al Viro2b2d0282017-06-07 09:42:41 +0100245 struct timezone __user *, tz)
246{
247 struct timespec64 new_ts;
248 struct timeval user_tv;
249 struct timezone new_tz;
250
251 if (tv) {
252 if (compat_get_timeval(&user_tv, tv))
253 return -EFAULT;
254 new_ts.tv_sec = user_tv.tv_sec;
255 new_ts.tv_nsec = user_tv.tv_usec * NSEC_PER_USEC;
256 }
257 if (tz) {
258 if (copy_from_user(&new_tz, tz, sizeof(*tz)))
259 return -EFAULT;
260 }
261
262 return do_sys_settimeofday64(tv ? &new_ts : NULL, tz ? &new_tz : NULL);
263}
264#endif
265
Deepa Dinamani3876ced2018-07-02 22:44:22 -0700266#if !defined(CONFIG_64BIT_TIME) || defined(CONFIG_64BIT)
267SYSCALL_DEFINE1(adjtimex, struct __kernel_timex __user *, txc_p)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700268{
Deepa Dinamaniead25412018-07-02 22:44:21 -0700269 struct __kernel_timex txc; /* Local copy of parameter */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700270 int ret;
271
272 /* Copy the user data space into the kernel copy
273 * structure. But bear in mind that the structures
274 * may change
275 */
Deepa Dinamaniead25412018-07-02 22:44:21 -0700276 if (copy_from_user(&txc, txc_p, sizeof(struct __kernel_timex)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700277 return -EFAULT;
278 ret = do_adjtimex(&txc);
Deepa Dinamaniead25412018-07-02 22:44:21 -0700279 return copy_to_user(txc_p, &txc, sizeof(struct __kernel_timex)) ? -EFAULT : ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700280}
Deepa Dinamani3876ced2018-07-02 22:44:22 -0700281#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700282
Arnd Bergmann4d5f0072019-01-02 13:28:47 +0100283#ifdef CONFIG_COMPAT_32BIT_TIME
Deepa Dinamaniead25412018-07-02 22:44:21 -0700284int get_old_timex32(struct __kernel_timex *txc, const struct old_timex32 __user *utp)
Arnd Bergmann4d5f0072019-01-02 13:28:47 +0100285{
286 struct old_timex32 tx32;
Al Viro3a4d44b2017-06-07 09:42:34 +0100287
Deepa Dinamaniead25412018-07-02 22:44:21 -0700288 memset(txc, 0, sizeof(struct __kernel_timex));
Arnd Bergmann4d5f0072019-01-02 13:28:47 +0100289 if (copy_from_user(&tx32, utp, sizeof(struct old_timex32)))
290 return -EFAULT;
291
292 txc->modes = tx32.modes;
293 txc->offset = tx32.offset;
294 txc->freq = tx32.freq;
295 txc->maxerror = tx32.maxerror;
296 txc->esterror = tx32.esterror;
297 txc->status = tx32.status;
298 txc->constant = tx32.constant;
299 txc->precision = tx32.precision;
300 txc->tolerance = tx32.tolerance;
301 txc->time.tv_sec = tx32.time.tv_sec;
302 txc->time.tv_usec = tx32.time.tv_usec;
303 txc->tick = tx32.tick;
304 txc->ppsfreq = tx32.ppsfreq;
305 txc->jitter = tx32.jitter;
306 txc->shift = tx32.shift;
307 txc->stabil = tx32.stabil;
308 txc->jitcnt = tx32.jitcnt;
309 txc->calcnt = tx32.calcnt;
310 txc->errcnt = tx32.errcnt;
311 txc->stbcnt = tx32.stbcnt;
312
313 return 0;
314}
315
Deepa Dinamaniead25412018-07-02 22:44:21 -0700316int put_old_timex32(struct old_timex32 __user *utp, const struct __kernel_timex *txc)
Arnd Bergmann4d5f0072019-01-02 13:28:47 +0100317{
318 struct old_timex32 tx32;
319
320 memset(&tx32, 0, sizeof(struct old_timex32));
321 tx32.modes = txc->modes;
322 tx32.offset = txc->offset;
323 tx32.freq = txc->freq;
324 tx32.maxerror = txc->maxerror;
325 tx32.esterror = txc->esterror;
326 tx32.status = txc->status;
327 tx32.constant = txc->constant;
328 tx32.precision = txc->precision;
329 tx32.tolerance = txc->tolerance;
330 tx32.time.tv_sec = txc->time.tv_sec;
331 tx32.time.tv_usec = txc->time.tv_usec;
332 tx32.tick = txc->tick;
333 tx32.ppsfreq = txc->ppsfreq;
334 tx32.jitter = txc->jitter;
335 tx32.shift = txc->shift;
336 tx32.stabil = txc->stabil;
337 tx32.jitcnt = txc->jitcnt;
338 tx32.calcnt = txc->calcnt;
339 tx32.errcnt = txc->errcnt;
340 tx32.stbcnt = txc->stbcnt;
341 tx32.tai = txc->tai;
342 if (copy_to_user(utp, &tx32, sizeof(struct old_timex32)))
343 return -EFAULT;
344 return 0;
345}
346
Arnd Bergmann8dabe722019-01-07 00:33:08 +0100347SYSCALL_DEFINE1(adjtimex_time32, struct old_timex32 __user *, utp)
Al Viro3a4d44b2017-06-07 09:42:34 +0100348{
Deepa Dinamaniead25412018-07-02 22:44:21 -0700349 struct __kernel_timex txc;
Al Viro3a4d44b2017-06-07 09:42:34 +0100350 int err, ret;
351
Arnd Bergmann4d5f0072019-01-02 13:28:47 +0100352 err = get_old_timex32(&txc, utp);
Al Viro3a4d44b2017-06-07 09:42:34 +0100353 if (err)
354 return err;
355
356 ret = do_adjtimex(&txc);
357
Arnd Bergmann4d5f0072019-01-02 13:28:47 +0100358 err = put_old_timex32(utp, &txc);
Al Viro3a4d44b2017-06-07 09:42:34 +0100359 if (err)
360 return err;
361
362 return ret;
363}
364#endif
365
Eric Dumazet753e9c52007-05-08 00:25:32 -0700366/*
367 * Convert jiffies to milliseconds and back.
368 *
369 * Avoid unnecessary multiplications/divisions in the
370 * two most common HZ cases:
371 */
Greg Kroah-Hartmanaf3b5622013-02-21 16:42:40 -0800372unsigned int jiffies_to_msecs(const unsigned long j)
Eric Dumazet753e9c52007-05-08 00:25:32 -0700373{
374#if HZ <= MSEC_PER_SEC && !(MSEC_PER_SEC % HZ)
375 return (MSEC_PER_SEC / HZ) * j;
376#elif HZ > MSEC_PER_SEC && !(HZ % MSEC_PER_SEC)
377 return (j + (HZ / MSEC_PER_SEC) - 1)/(HZ / MSEC_PER_SEC);
378#else
H. Peter Anvinbdc80782008-02-08 04:21:26 -0800379# if BITS_PER_LONG == 32
Geert Uytterhoevenabcbcb82018-06-22 16:33:57 +0200380 return (HZ_TO_MSEC_MUL32 * j + (1ULL << HZ_TO_MSEC_SHR32) - 1) >>
381 HZ_TO_MSEC_SHR32;
H. Peter Anvinbdc80782008-02-08 04:21:26 -0800382# else
Geert Uytterhoevenabcbcb82018-06-22 16:33:57 +0200383 return DIV_ROUND_UP(j * HZ_TO_MSEC_NUM, HZ_TO_MSEC_DEN);
H. Peter Anvinbdc80782008-02-08 04:21:26 -0800384# endif
Eric Dumazet753e9c52007-05-08 00:25:32 -0700385#endif
386}
387EXPORT_SYMBOL(jiffies_to_msecs);
388
Greg Kroah-Hartmanaf3b5622013-02-21 16:42:40 -0800389unsigned int jiffies_to_usecs(const unsigned long j)
Eric Dumazet753e9c52007-05-08 00:25:32 -0700390{
Frederic Weisbeckere0758672014-10-10 02:44:01 +0200391 /*
392 * Hz usually doesn't go much further MSEC_PER_SEC.
393 * jiffies_to_usecs() and usecs_to_jiffies() depend on that.
394 */
395 BUILD_BUG_ON(HZ > USEC_PER_SEC);
396
397#if !(USEC_PER_SEC % HZ)
Eric Dumazet753e9c52007-05-08 00:25:32 -0700398 return (USEC_PER_SEC / HZ) * j;
Eric Dumazet753e9c52007-05-08 00:25:32 -0700399#else
H. Peter Anvinbdc80782008-02-08 04:21:26 -0800400# if BITS_PER_LONG == 32
H. Peter Anvinb9095fd2008-05-02 16:18:42 -0700401 return (HZ_TO_USEC_MUL32 * j) >> HZ_TO_USEC_SHR32;
H. Peter Anvinbdc80782008-02-08 04:21:26 -0800402# else
403 return (j * HZ_TO_USEC_NUM) / HZ_TO_USEC_DEN;
404# endif
Eric Dumazet753e9c52007-05-08 00:25:32 -0700405#endif
406}
407EXPORT_SYMBOL(jiffies_to_usecs);
408
pang.xunlei90b6ce92014-11-18 19:15:18 +0800409/*
410 * mktime64 - Converts date to seconds.
411 * Converts Gregorian date to seconds since 1970-01-01 00:00:00.
Thomas Gleixner753be622006-01-09 20:52:22 -0800412 * Assumes input in normal date format, i.e. 1980-12-31 23:59:59
413 * => year=1980, mon=12, day=31, hour=23, min=59, sec=59.
414 *
415 * [For the Julian calendar (which was used in Russia before 1917,
416 * Britain & colonies before 1752, anywhere else before 1582,
417 * and is still in use by some communities) leave out the
418 * -year/100+year/400 terms, and add 10.]
419 *
420 * This algorithm was first published by Gauss (I think).
David Howellsede51472016-02-24 14:37:53 +0000421 *
422 * A leap second can be indicated by calling this function with sec as
423 * 60 (allowable under ISO 8601). The leap second is treated the same
424 * as the following second since they don't exist in UNIX time.
425 *
426 * An encoding of midnight at the end of the day as 24:00:00 - ie. midnight
427 * tomorrow - (allowable under ISO 8601) is supported.
Thomas Gleixner753be622006-01-09 20:52:22 -0800428 */
pang.xunlei90b6ce92014-11-18 19:15:18 +0800429time64_t mktime64(const unsigned int year0, const unsigned int mon0,
430 const unsigned int day, const unsigned int hour,
431 const unsigned int min, const unsigned int sec)
Thomas Gleixner753be622006-01-09 20:52:22 -0800432{
Ingo Molnarf4818902006-01-09 20:52:23 -0800433 unsigned int mon = mon0, year = year0;
434
435 /* 1..12 -> 11,12,1..10 */
436 if (0 >= (int) (mon -= 2)) {
437 mon += 12; /* Puts Feb last since it has leap day */
Thomas Gleixner753be622006-01-09 20:52:22 -0800438 year -= 1;
439 }
440
pang.xunlei90b6ce92014-11-18 19:15:18 +0800441 return ((((time64_t)
Thomas Gleixner753be622006-01-09 20:52:22 -0800442 (year/4 - year/100 + year/400 + 367*mon/12 + day) +
443 year*365 - 719499
David Howellsede51472016-02-24 14:37:53 +0000444 )*24 + hour /* now have hours - midnight tomorrow handled here */
Thomas Gleixner753be622006-01-09 20:52:22 -0800445 )*60 + min /* now have minutes */
446 )*60 + sec; /* finally seconds */
447}
pang.xunlei90b6ce92014-11-18 19:15:18 +0800448EXPORT_SYMBOL(mktime64);
Andrew Morton199e7052006-01-09 20:52:24 -0800449
Thomas Gleixner753be622006-01-09 20:52:22 -0800450/**
Thomas Gleixnerf8f46da2006-01-09 20:52:30 -0800451 * ns_to_timespec - Convert nanoseconds to timespec
452 * @nsec: the nanoseconds value to be converted
453 *
454 * Returns the timespec representation of the nsec parameter.
455 */
Roman Zippeldf869b62006-03-26 01:38:11 -0800456struct timespec ns_to_timespec(const s64 nsec)
Thomas Gleixnerf8f46da2006-01-09 20:52:30 -0800457{
458 struct timespec ts;
Roman Zippelf8bd2252008-05-01 04:34:31 -0700459 s32 rem;
Thomas Gleixnerf8f46da2006-01-09 20:52:30 -0800460
George Anzinger88fc3892006-02-03 03:04:20 -0800461 if (!nsec)
462 return (struct timespec) {0, 0};
463
Roman Zippelf8bd2252008-05-01 04:34:31 -0700464 ts.tv_sec = div_s64_rem(nsec, NSEC_PER_SEC, &rem);
465 if (unlikely(rem < 0)) {
466 ts.tv_sec--;
467 rem += NSEC_PER_SEC;
468 }
469 ts.tv_nsec = rem;
Thomas Gleixnerf8f46da2006-01-09 20:52:30 -0800470
471 return ts;
472}
Stephen Hemminger85795d62007-03-24 21:35:33 -0700473EXPORT_SYMBOL(ns_to_timespec);
Thomas Gleixnerf8f46da2006-01-09 20:52:30 -0800474
475/**
476 * ns_to_timeval - Convert nanoseconds to timeval
477 * @nsec: the nanoseconds value to be converted
478 *
479 * Returns the timeval representation of the nsec parameter.
480 */
Roman Zippeldf869b62006-03-26 01:38:11 -0800481struct timeval ns_to_timeval(const s64 nsec)
Thomas Gleixnerf8f46da2006-01-09 20:52:30 -0800482{
483 struct timespec ts = ns_to_timespec(nsec);
484 struct timeval tv;
485
486 tv.tv_sec = ts.tv_sec;
487 tv.tv_usec = (suseconds_t) ts.tv_nsec / 1000;
488
489 return tv;
490}
Eric Dumazetb7aa0bf2007-04-19 16:16:32 -0700491EXPORT_SYMBOL(ns_to_timeval);
Thomas Gleixnerf8f46da2006-01-09 20:52:30 -0800492
Arnd Bergmanna84d1162018-03-15 17:12:40 +0100493struct __kernel_old_timeval ns_to_kernel_old_timeval(const s64 nsec)
494{
495 struct timespec64 ts = ns_to_timespec64(nsec);
496 struct __kernel_old_timeval tv;
497
498 tv.tv_sec = ts.tv_sec;
499 tv.tv_usec = (suseconds_t)ts.tv_nsec / 1000;
500
501 return tv;
502}
503EXPORT_SYMBOL(ns_to_kernel_old_timeval);
504
John Stultz49cd6f82014-07-16 21:03:59 +0000505/**
506 * set_normalized_timespec - set timespec sec and nsec parts and normalize
507 *
508 * @ts: pointer to timespec variable to be set
509 * @sec: seconds to set
510 * @nsec: nanoseconds to set
511 *
512 * Set seconds and nanoseconds field of a timespec variable and
513 * normalize to the timespec storage format
514 *
515 * Note: The tv_nsec part is always in the range of
516 * 0 <= tv_nsec < NSEC_PER_SEC
517 * For negative values only the tv_sec field is negative !
518 */
519void set_normalized_timespec64(struct timespec64 *ts, time64_t sec, s64 nsec)
520{
521 while (nsec >= NSEC_PER_SEC) {
522 /*
523 * The following asm() prevents the compiler from
524 * optimising this loop into a modulo operation. See
525 * also __iter_div_u64_rem() in include/linux/time.h
526 */
527 asm("" : "+rm"(nsec));
528 nsec -= NSEC_PER_SEC;
529 ++sec;
530 }
531 while (nsec < 0) {
532 asm("" : "+rm"(nsec));
533 nsec += NSEC_PER_SEC;
534 --sec;
535 }
536 ts->tv_sec = sec;
537 ts->tv_nsec = nsec;
538}
539EXPORT_SYMBOL(set_normalized_timespec64);
540
541/**
542 * ns_to_timespec64 - Convert nanoseconds to timespec64
543 * @nsec: the nanoseconds value to be converted
544 *
545 * Returns the timespec64 representation of the nsec parameter.
546 */
547struct timespec64 ns_to_timespec64(const s64 nsec)
548{
549 struct timespec64 ts;
550 s32 rem;
551
552 if (!nsec)
553 return (struct timespec64) {0, 0};
554
555 ts.tv_sec = div_s64_rem(nsec, NSEC_PER_SEC, &rem);
556 if (unlikely(rem < 0)) {
557 ts.tv_sec--;
558 rem += NSEC_PER_SEC;
559 }
560 ts.tv_nsec = rem;
561
562 return ts;
563}
564EXPORT_SYMBOL(ns_to_timespec64);
Arnd Bergmannabc8f962017-10-19 13:14:48 +0200565
Nicholas Mc Guireca42aaf2015-05-18 14:19:13 +0200566/**
567 * msecs_to_jiffies: - convert milliseconds to jiffies
568 * @m: time in milliseconds
569 *
570 * conversion is done as follows:
Ingo Molnar41cf5442007-02-16 01:27:28 -0800571 *
572 * - negative values mean 'infinite timeout' (MAX_JIFFY_OFFSET)
573 *
574 * - 'too large' values [that would result in larger than
575 * MAX_JIFFY_OFFSET values] mean 'infinite timeout' too.
576 *
577 * - all other values are converted to jiffies by either multiplying
Nicholas Mc Guireca42aaf2015-05-18 14:19:13 +0200578 * the input value by a factor or dividing it with a factor and
579 * handling any 32-bit overflows.
580 * for the details see __msecs_to_jiffies()
Ingo Molnar41cf5442007-02-16 01:27:28 -0800581 *
Nicholas Mc Guireca42aaf2015-05-18 14:19:13 +0200582 * msecs_to_jiffies() checks for the passed in value being a constant
583 * via __builtin_constant_p() allowing gcc to eliminate most of the
584 * code, __msecs_to_jiffies() is called if the value passed does not
585 * allow constant folding and the actual conversion must be done at
586 * runtime.
587 * the _msecs_to_jiffies helpers are the HZ dependent conversion
588 * routines found in include/linux/jiffies.h
Ingo Molnar41cf5442007-02-16 01:27:28 -0800589 */
Nicholas Mc Guireca42aaf2015-05-18 14:19:13 +0200590unsigned long __msecs_to_jiffies(const unsigned int m)
Ingo Molnar8b9365d2007-02-16 01:27:27 -0800591{
Ingo Molnar41cf5442007-02-16 01:27:28 -0800592 /*
593 * Negative value, means infinite timeout:
594 */
595 if ((int)m < 0)
Ingo Molnar8b9365d2007-02-16 01:27:27 -0800596 return MAX_JIFFY_OFFSET;
Nicholas Mc Guireca42aaf2015-05-18 14:19:13 +0200597 return _msecs_to_jiffies(m);
Ingo Molnar8b9365d2007-02-16 01:27:27 -0800598}
Nicholas Mc Guireca42aaf2015-05-18 14:19:13 +0200599EXPORT_SYMBOL(__msecs_to_jiffies);
Ingo Molnar8b9365d2007-02-16 01:27:27 -0800600
Nicholas Mc Guireae60d6a2015-05-28 19:09:55 +0200601unsigned long __usecs_to_jiffies(const unsigned int u)
Ingo Molnar8b9365d2007-02-16 01:27:27 -0800602{
603 if (u > jiffies_to_usecs(MAX_JIFFY_OFFSET))
604 return MAX_JIFFY_OFFSET;
Nicholas Mc Guireae60d6a2015-05-28 19:09:55 +0200605 return _usecs_to_jiffies(u);
Ingo Molnar8b9365d2007-02-16 01:27:27 -0800606}
Nicholas Mc Guireae60d6a2015-05-28 19:09:55 +0200607EXPORT_SYMBOL(__usecs_to_jiffies);
Ingo Molnar8b9365d2007-02-16 01:27:27 -0800608
609/*
610 * The TICK_NSEC - 1 rounds up the value to the next resolution. Note
611 * that a remainder subtract here would not do the right thing as the
612 * resolution values don't fall on second boundries. I.e. the line:
613 * nsec -= nsec % TICK_NSEC; is NOT a correct resolution rounding.
Andrew Hunterd78c9302014-09-04 14:17:16 -0700614 * Note that due to the small error in the multiplier here, this
615 * rounding is incorrect for sufficiently large values of tv_nsec, but
616 * well formed timespecs should have tv_nsec < NSEC_PER_SEC, so we're
617 * OK.
Ingo Molnar8b9365d2007-02-16 01:27:27 -0800618 *
619 * Rather, we just shift the bits off the right.
620 *
621 * The >> (NSEC_JIFFIE_SC - SEC_JIFFIE_SC) converts the scaled nsec
622 * value to a scaled second value.
623 */
Andrew Hunterd78c9302014-09-04 14:17:16 -0700624static unsigned long
Baolin Wang9ca30852015-07-29 20:18:31 +0800625__timespec64_to_jiffies(u64 sec, long nsec)
Ingo Molnar8b9365d2007-02-16 01:27:27 -0800626{
Andrew Hunterd78c9302014-09-04 14:17:16 -0700627 nsec = nsec + TICK_NSEC - 1;
Ingo Molnar8b9365d2007-02-16 01:27:27 -0800628
629 if (sec >= MAX_SEC_IN_JIFFIES){
630 sec = MAX_SEC_IN_JIFFIES;
631 nsec = 0;
632 }
Baolin Wang9ca30852015-07-29 20:18:31 +0800633 return ((sec * SEC_CONVERSION) +
Ingo Molnar8b9365d2007-02-16 01:27:27 -0800634 (((u64)nsec * NSEC_CONVERSION) >>
635 (NSEC_JIFFIE_SC - SEC_JIFFIE_SC))) >> SEC_JIFFIE_SC;
636
637}
Andrew Hunterd78c9302014-09-04 14:17:16 -0700638
Baolin Wang9ca30852015-07-29 20:18:31 +0800639static unsigned long
640__timespec_to_jiffies(unsigned long sec, long nsec)
Andrew Hunterd78c9302014-09-04 14:17:16 -0700641{
Baolin Wang9ca30852015-07-29 20:18:31 +0800642 return __timespec64_to_jiffies((u64)sec, nsec);
Andrew Hunterd78c9302014-09-04 14:17:16 -0700643}
644
Baolin Wang9ca30852015-07-29 20:18:31 +0800645unsigned long
646timespec64_to_jiffies(const struct timespec64 *value)
647{
648 return __timespec64_to_jiffies(value->tv_sec, value->tv_nsec);
649}
650EXPORT_SYMBOL(timespec64_to_jiffies);
Ingo Molnar8b9365d2007-02-16 01:27:27 -0800651
652void
Baolin Wang9ca30852015-07-29 20:18:31 +0800653jiffies_to_timespec64(const unsigned long jiffies, struct timespec64 *value)
Ingo Molnar8b9365d2007-02-16 01:27:27 -0800654{
655 /*
656 * Convert jiffies to nanoseconds and separate with
657 * one divide.
658 */
Roman Zippelf8bd2252008-05-01 04:34:31 -0700659 u32 rem;
660 value->tv_sec = div_u64_rem((u64)jiffies * TICK_NSEC,
661 NSEC_PER_SEC, &rem);
662 value->tv_nsec = rem;
Ingo Molnar8b9365d2007-02-16 01:27:27 -0800663}
Baolin Wang9ca30852015-07-29 20:18:31 +0800664EXPORT_SYMBOL(jiffies_to_timespec64);
Ingo Molnar8b9365d2007-02-16 01:27:27 -0800665
Andrew Hunterd78c9302014-09-04 14:17:16 -0700666/*
667 * We could use a similar algorithm to timespec_to_jiffies (with a
668 * different multiplier for usec instead of nsec). But this has a
669 * problem with rounding: we can't exactly add TICK_NSEC - 1 to the
670 * usec value, since it's not necessarily integral.
Ingo Molnar8b9365d2007-02-16 01:27:27 -0800671 *
Andrew Hunterd78c9302014-09-04 14:17:16 -0700672 * We could instead round in the intermediate scaled representation
673 * (i.e. in units of 1/2^(large scale) jiffies) but that's also
674 * perilous: the scaling introduces a small positive error, which
675 * combined with a division-rounding-upward (i.e. adding 2^(scale) - 1
676 * units to the intermediate before shifting) leads to accidental
677 * overflow and overestimates.
678 *
679 * At the cost of one additional multiplication by a constant, just
680 * use the timespec implementation.
Ingo Molnar8b9365d2007-02-16 01:27:27 -0800681 */
682unsigned long
683timeval_to_jiffies(const struct timeval *value)
684{
Andrew Hunterd78c9302014-09-04 14:17:16 -0700685 return __timespec_to_jiffies(value->tv_sec,
686 value->tv_usec * NSEC_PER_USEC);
Ingo Molnar8b9365d2007-02-16 01:27:27 -0800687}
Thomas Bittermann456a09d2007-04-04 22:20:54 +0200688EXPORT_SYMBOL(timeval_to_jiffies);
Ingo Molnar8b9365d2007-02-16 01:27:27 -0800689
690void jiffies_to_timeval(const unsigned long jiffies, struct timeval *value)
691{
692 /*
693 * Convert jiffies to nanoseconds and separate with
694 * one divide.
695 */
Roman Zippelf8bd2252008-05-01 04:34:31 -0700696 u32 rem;
Ingo Molnar8b9365d2007-02-16 01:27:27 -0800697
Roman Zippelf8bd2252008-05-01 04:34:31 -0700698 value->tv_sec = div_u64_rem((u64)jiffies * TICK_NSEC,
699 NSEC_PER_SEC, &rem);
700 value->tv_usec = rem / NSEC_PER_USEC;
Ingo Molnar8b9365d2007-02-16 01:27:27 -0800701}
Thomas Bittermann456a09d2007-04-04 22:20:54 +0200702EXPORT_SYMBOL(jiffies_to_timeval);
Ingo Molnar8b9365d2007-02-16 01:27:27 -0800703
704/*
705 * Convert jiffies/jiffies_64 to clock_t and back.
706 */
hankcbbc7192011-09-20 13:53:39 -0700707clock_t jiffies_to_clock_t(unsigned long x)
Ingo Molnar8b9365d2007-02-16 01:27:27 -0800708{
709#if (TICK_NSEC % (NSEC_PER_SEC / USER_HZ)) == 0
David Fries6ffc7872008-02-06 01:38:04 -0800710# if HZ < USER_HZ
711 return x * (USER_HZ / HZ);
712# else
Ingo Molnar8b9365d2007-02-16 01:27:27 -0800713 return x / (HZ / USER_HZ);
David Fries6ffc7872008-02-06 01:38:04 -0800714# endif
Ingo Molnar8b9365d2007-02-16 01:27:27 -0800715#else
Roman Zippel71abb3a2008-05-01 04:34:26 -0700716 return div_u64((u64)x * TICK_NSEC, NSEC_PER_SEC / USER_HZ);
Ingo Molnar8b9365d2007-02-16 01:27:27 -0800717#endif
718}
719EXPORT_SYMBOL(jiffies_to_clock_t);
720
721unsigned long clock_t_to_jiffies(unsigned long x)
722{
723#if (HZ % USER_HZ)==0
724 if (x >= ~0UL / (HZ / USER_HZ))
725 return ~0UL;
726 return x * (HZ / USER_HZ);
727#else
Ingo Molnar8b9365d2007-02-16 01:27:27 -0800728 /* Don't worry about loss of precision here .. */
729 if (x >= ~0UL / HZ * USER_HZ)
730 return ~0UL;
731
732 /* .. but do try to contain it here */
Roman Zippel71abb3a2008-05-01 04:34:26 -0700733 return div_u64((u64)x * HZ, USER_HZ);
Ingo Molnar8b9365d2007-02-16 01:27:27 -0800734#endif
735}
736EXPORT_SYMBOL(clock_t_to_jiffies);
737
738u64 jiffies_64_to_clock_t(u64 x)
739{
740#if (TICK_NSEC % (NSEC_PER_SEC / USER_HZ)) == 0
David Fries6ffc7872008-02-06 01:38:04 -0800741# if HZ < USER_HZ
Roman Zippel71abb3a2008-05-01 04:34:26 -0700742 x = div_u64(x * USER_HZ, HZ);
Andrew Mortonec03d702008-02-06 01:38:06 -0800743# elif HZ > USER_HZ
Roman Zippel71abb3a2008-05-01 04:34:26 -0700744 x = div_u64(x, HZ / USER_HZ);
Andrew Mortonec03d702008-02-06 01:38:06 -0800745# else
746 /* Nothing to do */
David Fries6ffc7872008-02-06 01:38:04 -0800747# endif
Ingo Molnar8b9365d2007-02-16 01:27:27 -0800748#else
749 /*
750 * There are better ways that don't overflow early,
751 * but even this doesn't overflow in hundreds of years
752 * in 64 bits, so..
753 */
Roman Zippel71abb3a2008-05-01 04:34:26 -0700754 x = div_u64(x * TICK_NSEC, (NSEC_PER_SEC / USER_HZ));
Ingo Molnar8b9365d2007-02-16 01:27:27 -0800755#endif
756 return x;
757}
Ingo Molnar8b9365d2007-02-16 01:27:27 -0800758EXPORT_SYMBOL(jiffies_64_to_clock_t);
759
760u64 nsec_to_clock_t(u64 x)
761{
762#if (NSEC_PER_SEC % USER_HZ) == 0
Roman Zippel71abb3a2008-05-01 04:34:26 -0700763 return div_u64(x, NSEC_PER_SEC / USER_HZ);
Ingo Molnar8b9365d2007-02-16 01:27:27 -0800764#elif (USER_HZ % 512) == 0
Roman Zippel71abb3a2008-05-01 04:34:26 -0700765 return div_u64(x * USER_HZ / 512, NSEC_PER_SEC / 512);
Ingo Molnar8b9365d2007-02-16 01:27:27 -0800766#else
767 /*
768 * max relative error 5.7e-8 (1.8s per year) for USER_HZ <= 1024,
769 * overflow after 64.99 years.
770 * exact for HZ=60, 72, 90, 120, 144, 180, 300, 600, 900, ...
771 */
Roman Zippel71abb3a2008-05-01 04:34:26 -0700772 return div_u64(x * 9, (9ull * NSEC_PER_SEC + (USER_HZ / 2)) / USER_HZ);
Ingo Molnar8b9365d2007-02-16 01:27:27 -0800773#endif
Ingo Molnar8b9365d2007-02-16 01:27:27 -0800774}
775
Frederic Weisbecker07e5f5e2017-01-31 04:09:17 +0100776u64 jiffies64_to_nsecs(u64 j)
777{
778#if !(NSEC_PER_SEC % HZ)
779 return (NSEC_PER_SEC / HZ) * j;
780# else
781 return div_u64(j * HZ_TO_NSEC_NUM, HZ_TO_NSEC_DEN);
782#endif
783}
784EXPORT_SYMBOL(jiffies64_to_nsecs);
785
Li RongQing3b15d092019-02-28 13:13:26 +0800786u64 jiffies64_to_msecs(const u64 j)
787{
788#if HZ <= MSEC_PER_SEC && !(MSEC_PER_SEC % HZ)
789 return (MSEC_PER_SEC / HZ) * j;
790#else
791 return div_u64(j * HZ_TO_MSEC_NUM, HZ_TO_MSEC_DEN);
792#endif
793}
794EXPORT_SYMBOL(jiffies64_to_msecs);
795
Hidetoshi Setob7b20df92009-11-26 14:49:27 +0900796/**
Venkatesh Pallipadia1dabb62010-12-21 17:09:01 -0800797 * nsecs_to_jiffies64 - Convert nsecs in u64 to jiffies64
Hidetoshi Setob7b20df92009-11-26 14:49:27 +0900798 *
799 * @n: nsecs in u64
800 *
801 * Unlike {m,u}secs_to_jiffies, type of input is not unsigned int but u64.
802 * And this doesn't return MAX_JIFFY_OFFSET since this function is designed
803 * for scheduler, not for use in device drivers to calculate timeout value.
804 *
805 * note:
806 * NSEC_PER_SEC = 10^9 = (5^9 * 2^9) = (1953125 * 512)
807 * ULLONG_MAX ns = 18446744073.709551615 secs = about 584 years
808 */
Venkatesh Pallipadia1dabb62010-12-21 17:09:01 -0800809u64 nsecs_to_jiffies64(u64 n)
Hidetoshi Setob7b20df92009-11-26 14:49:27 +0900810{
811#if (NSEC_PER_SEC % HZ) == 0
812 /* Common case, HZ = 100, 128, 200, 250, 256, 500, 512, 1000 etc. */
813 return div_u64(n, NSEC_PER_SEC / HZ);
814#elif (HZ % 512) == 0
815 /* overflow after 292 years if HZ = 1024 */
816 return div_u64(n * HZ / 512, NSEC_PER_SEC / 512);
817#else
818 /*
819 * Generic case - optimized for cases where HZ is a multiple of 3.
820 * overflow after 64.99 years, exact for HZ = 60, 72, 90, 120 etc.
821 */
822 return div_u64(n * 9, (9ull * NSEC_PER_SEC + HZ / 2) / HZ);
823#endif
824}
Daniel Vetter7bd0e222014-12-04 11:12:54 +0100825EXPORT_SYMBOL(nsecs_to_jiffies64);
Hidetoshi Setob7b20df92009-11-26 14:49:27 +0900826
Venkatesh Pallipadia1dabb62010-12-21 17:09:01 -0800827/**
828 * nsecs_to_jiffies - Convert nsecs in u64 to jiffies
829 *
830 * @n: nsecs in u64
831 *
832 * Unlike {m,u}secs_to_jiffies, type of input is not unsigned int but u64.
833 * And this doesn't return MAX_JIFFY_OFFSET since this function is designed
834 * for scheduler, not for use in device drivers to calculate timeout value.
835 *
836 * note:
837 * NSEC_PER_SEC = 10^9 = (5^9 * 2^9) = (1953125 * 512)
838 * ULLONG_MAX ns = 18446744073.709551615 secs = about 584 years
839 */
840unsigned long nsecs_to_jiffies(u64 n)
841{
842 return (unsigned long)nsecs_to_jiffies64(n);
843}
Thomas Gleixnerd560fed2014-07-16 21:04:31 +0000844EXPORT_SYMBOL_GPL(nsecs_to_jiffies);
Venkatesh Pallipadia1dabb62010-12-21 17:09:01 -0800845
Thomas Gleixnerdf0cc052008-08-31 08:09:53 -0700846/*
Deepa Dinamanibc2c53e2016-05-19 17:09:02 -0700847 * Add two timespec64 values and do a safety check for overflow.
848 * It's assumed that both values are valid (>= 0).
849 * And, each timespec64 is in normalized form.
850 */
851struct timespec64 timespec64_add_safe(const struct timespec64 lhs,
852 const struct timespec64 rhs)
853{
854 struct timespec64 res;
855
Vegard Nossum469e857f32016-08-12 20:14:09 +0200856 set_normalized_timespec64(&res, (timeu64_t) lhs.tv_sec + rhs.tv_sec,
Deepa Dinamanibc2c53e2016-05-19 17:09:02 -0700857 lhs.tv_nsec + rhs.tv_nsec);
858
859 if (unlikely(res.tv_sec < lhs.tv_sec || res.tv_sec < rhs.tv_sec)) {
860 res.tv_sec = TIME64_MAX;
861 res.tv_nsec = 0;
862 }
863
864 return res;
865}
Deepa Dinamanif59dd9c2017-06-24 11:45:02 -0700866
867int get_timespec64(struct timespec64 *ts,
Deepa Dinamaniea2ce8f2018-03-13 21:03:31 -0700868 const struct __kernel_timespec __user *uts)
Deepa Dinamanif59dd9c2017-06-24 11:45:02 -0700869{
Deepa Dinamaniea2ce8f2018-03-13 21:03:31 -0700870 struct __kernel_timespec kts;
Deepa Dinamanif59dd9c2017-06-24 11:45:02 -0700871 int ret;
872
873 ret = copy_from_user(&kts, uts, sizeof(kts));
874 if (ret)
875 return -EFAULT;
876
877 ts->tv_sec = kts.tv_sec;
Deepa Dinamaniea2ce8f2018-03-13 21:03:31 -0700878
879 /* Zero out the padding for 32 bit systems or in compat mode */
Dmitry Safonov98f76202018-10-12 14:42:53 +0100880 if (IS_ENABLED(CONFIG_64BIT_TIME) && in_compat_syscall())
Deepa Dinamaniea2ce8f2018-03-13 21:03:31 -0700881 kts.tv_nsec &= 0xFFFFFFFFUL;
882
Deepa Dinamanif59dd9c2017-06-24 11:45:02 -0700883 ts->tv_nsec = kts.tv_nsec;
884
885 return 0;
886}
887EXPORT_SYMBOL_GPL(get_timespec64);
888
889int put_timespec64(const struct timespec64 *ts,
Deepa Dinamaniea2ce8f2018-03-13 21:03:31 -0700890 struct __kernel_timespec __user *uts)
Deepa Dinamanif59dd9c2017-06-24 11:45:02 -0700891{
Deepa Dinamaniea2ce8f2018-03-13 21:03:31 -0700892 struct __kernel_timespec kts = {
Deepa Dinamanif59dd9c2017-06-24 11:45:02 -0700893 .tv_sec = ts->tv_sec,
894 .tv_nsec = ts->tv_nsec
895 };
Deepa Dinamaniea2ce8f2018-03-13 21:03:31 -0700896
Deepa Dinamanif59dd9c2017-06-24 11:45:02 -0700897 return copy_to_user(uts, &kts, sizeof(kts)) ? -EFAULT : 0;
898}
899EXPORT_SYMBOL_GPL(put_timespec64);
Deepa Dinamanid5b7ffb2017-06-24 11:45:03 -0700900
kbuild test robot743f5cd2018-08-29 20:50:52 +0800901static int __get_old_timespec32(struct timespec64 *ts64,
Arnd Bergmann9afc5ee2018-07-13 12:52:28 +0200902 const struct old_timespec32 __user *cts)
Deepa Dinamani1c68adf2018-03-13 21:03:26 -0700903{
Arnd Bergmann9afc5ee2018-07-13 12:52:28 +0200904 struct old_timespec32 ts;
Deepa Dinamani1c68adf2018-03-13 21:03:26 -0700905 int ret;
906
907 ret = copy_from_user(&ts, cts, sizeof(ts));
908 if (ret)
909 return -EFAULT;
910
911 ts64->tv_sec = ts.tv_sec;
912 ts64->tv_nsec = ts.tv_nsec;
913
914 return 0;
915}
916
kbuild test robot743f5cd2018-08-29 20:50:52 +0800917static int __put_old_timespec32(const struct timespec64 *ts64,
Arnd Bergmann9afc5ee2018-07-13 12:52:28 +0200918 struct old_timespec32 __user *cts)
Deepa Dinamani1c68adf2018-03-13 21:03:26 -0700919{
Arnd Bergmann9afc5ee2018-07-13 12:52:28 +0200920 struct old_timespec32 ts = {
Deepa Dinamani1c68adf2018-03-13 21:03:26 -0700921 .tv_sec = ts64->tv_sec,
922 .tv_nsec = ts64->tv_nsec
923 };
924 return copy_to_user(cts, &ts, sizeof(ts)) ? -EFAULT : 0;
925}
926
Arnd Bergmann9afc5ee2018-07-13 12:52:28 +0200927int get_old_timespec32(struct timespec64 *ts, const void __user *uts)
Deepa Dinamani1c68adf2018-03-13 21:03:26 -0700928{
929 if (COMPAT_USE_64BIT_TIME)
930 return copy_from_user(ts, uts, sizeof(*ts)) ? -EFAULT : 0;
931 else
Arnd Bergmann9afc5ee2018-07-13 12:52:28 +0200932 return __get_old_timespec32(ts, uts);
Deepa Dinamani1c68adf2018-03-13 21:03:26 -0700933}
Arnd Bergmann9afc5ee2018-07-13 12:52:28 +0200934EXPORT_SYMBOL_GPL(get_old_timespec32);
Deepa Dinamani1c68adf2018-03-13 21:03:26 -0700935
Arnd Bergmann9afc5ee2018-07-13 12:52:28 +0200936int put_old_timespec32(const struct timespec64 *ts, void __user *uts)
Deepa Dinamani1c68adf2018-03-13 21:03:26 -0700937{
938 if (COMPAT_USE_64BIT_TIME)
939 return copy_to_user(uts, ts, sizeof(*ts)) ? -EFAULT : 0;
940 else
Arnd Bergmann9afc5ee2018-07-13 12:52:28 +0200941 return __put_old_timespec32(ts, uts);
Deepa Dinamani1c68adf2018-03-13 21:03:26 -0700942}
Arnd Bergmann9afc5ee2018-07-13 12:52:28 +0200943EXPORT_SYMBOL_GPL(put_old_timespec32);
Deepa Dinamani1c68adf2018-03-13 21:03:26 -0700944
Deepa Dinamanid5b7ffb2017-06-24 11:45:03 -0700945int get_itimerspec64(struct itimerspec64 *it,
Deepa Dinamanid0dd63a2018-06-16 22:11:42 -0700946 const struct __kernel_itimerspec __user *uit)
Deepa Dinamanid5b7ffb2017-06-24 11:45:03 -0700947{
948 int ret;
949
950 ret = get_timespec64(&it->it_interval, &uit->it_interval);
951 if (ret)
952 return ret;
953
954 ret = get_timespec64(&it->it_value, &uit->it_value);
955
956 return ret;
957}
958EXPORT_SYMBOL_GPL(get_itimerspec64);
959
960int put_itimerspec64(const struct itimerspec64 *it,
Deepa Dinamanid0dd63a2018-06-16 22:11:42 -0700961 struct __kernel_itimerspec __user *uit)
Deepa Dinamanid5b7ffb2017-06-24 11:45:03 -0700962{
963 int ret;
964
965 ret = put_timespec64(&it->it_interval, &uit->it_interval);
966 if (ret)
967 return ret;
968
969 ret = put_timespec64(&it->it_value, &uit->it_value);
970
971 return ret;
972}
973EXPORT_SYMBOL_GPL(put_itimerspec64);
Deepa Dinamaniafef05c2018-06-16 22:11:43 -0700974
Arnd Bergmann9afc5ee2018-07-13 12:52:28 +0200975int get_old_itimerspec32(struct itimerspec64 *its,
976 const struct old_itimerspec32 __user *uits)
Deepa Dinamaniafef05c2018-06-16 22:11:43 -0700977{
978
Arnd Bergmann9afc5ee2018-07-13 12:52:28 +0200979 if (__get_old_timespec32(&its->it_interval, &uits->it_interval) ||
980 __get_old_timespec32(&its->it_value, &uits->it_value))
Deepa Dinamaniafef05c2018-06-16 22:11:43 -0700981 return -EFAULT;
982 return 0;
983}
Arnd Bergmann9afc5ee2018-07-13 12:52:28 +0200984EXPORT_SYMBOL_GPL(get_old_itimerspec32);
Deepa Dinamaniafef05c2018-06-16 22:11:43 -0700985
Arnd Bergmann9afc5ee2018-07-13 12:52:28 +0200986int put_old_itimerspec32(const struct itimerspec64 *its,
987 struct old_itimerspec32 __user *uits)
Deepa Dinamaniafef05c2018-06-16 22:11:43 -0700988{
Arnd Bergmann9afc5ee2018-07-13 12:52:28 +0200989 if (__put_old_timespec32(&its->it_interval, &uits->it_interval) ||
990 __put_old_timespec32(&its->it_value, &uits->it_value))
Deepa Dinamaniafef05c2018-06-16 22:11:43 -0700991 return -EFAULT;
992 return 0;
993}
Arnd Bergmann9afc5ee2018-07-13 12:52:28 +0200994EXPORT_SYMBOL_GPL(put_old_itimerspec32);