Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | #ifndef _LINUX_TIME_H |
| 2 | #define _LINUX_TIME_H |
| 3 | |
Thomas Gleixner | 8264445 | 2007-07-21 04:37:37 -0700 | [diff] [blame] | 4 | # include <linux/cache.h> |
Ingo Molnar | 57a5587 | 2006-01-09 20:52:26 -0800 | [diff] [blame] | 5 | # include <linux/seqlock.h> |
Jeremy Fitzhardinge | f595ec9 | 2008-06-12 10:47:56 +0200 | [diff] [blame] | 6 | # include <linux/math64.h> |
David Howells | 607ca46 | 2012-10-13 10:46:48 +0100 | [diff] [blame] | 7 | #include <uapi/linux/time.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 8 | |
Christoph Hellwig | b418da1 | 2008-10-15 22:02:06 -0700 | [diff] [blame] | 9 | extern struct timezone sys_tz; |
| 10 | |
Ingo Molnar | 57a5587 | 2006-01-09 20:52:26 -0800 | [diff] [blame] | 11 | /* Parameters used to convert the timespec values: */ |
Vojtech Pavlik | 05ebb76 | 2006-06-26 13:58:20 +0200 | [diff] [blame] | 12 | #define MSEC_PER_SEC 1000L |
| 13 | #define USEC_PER_MSEC 1000L |
| 14 | #define NSEC_PER_USEC 1000L |
| 15 | #define NSEC_PER_MSEC 1000000L |
| 16 | #define USEC_PER_SEC 1000000L |
| 17 | #define NSEC_PER_SEC 1000000000L |
Chris Wilson | 4936a3b | 2010-08-09 14:20:10 -0700 | [diff] [blame] | 18 | #define FSEC_PER_SEC 1000000000000000LL |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 19 | |
Thomas Gleixner | df0cc05 | 2008-08-31 08:09:53 -0700 | [diff] [blame] | 20 | #define TIME_T_MAX (time_t)((1UL << ((sizeof(time_t) << 3) - 1)) - 1) |
| 21 | |
Jan Engelhardt | 5b78cc9 | 2007-07-17 04:03:53 -0700 | [diff] [blame] | 22 | static inline int timespec_equal(const struct timespec *a, |
| 23 | const struct timespec *b) |
Ingo Molnar | 57a5587 | 2006-01-09 20:52:26 -0800 | [diff] [blame] | 24 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 25 | return (a->tv_sec == b->tv_sec) && (a->tv_nsec == b->tv_nsec); |
Ingo Molnar | 57a5587 | 2006-01-09 20:52:26 -0800 | [diff] [blame] | 26 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 27 | |
Andrew Morton | 643a654 | 2006-02-11 17:55:52 -0800 | [diff] [blame] | 28 | /* |
| 29 | * lhs < rhs: return <0 |
| 30 | * lhs == rhs: return 0 |
| 31 | * lhs > rhs: return >0 |
| 32 | */ |
Rolf Eike Beer | 77adbfb | 2007-02-10 01:45:49 -0800 | [diff] [blame] | 33 | static inline int timespec_compare(const struct timespec *lhs, const struct timespec *rhs) |
Andrew Morton | 643a654 | 2006-02-11 17:55:52 -0800 | [diff] [blame] | 34 | { |
| 35 | if (lhs->tv_sec < rhs->tv_sec) |
| 36 | return -1; |
| 37 | if (lhs->tv_sec > rhs->tv_sec) |
| 38 | return 1; |
| 39 | return lhs->tv_nsec - rhs->tv_nsec; |
| 40 | } |
| 41 | |
Rolf Eike Beer | 77adbfb | 2007-02-10 01:45:49 -0800 | [diff] [blame] | 42 | static inline int timeval_compare(const struct timeval *lhs, const struct timeval *rhs) |
Andrew Morton | 643a654 | 2006-02-11 17:55:52 -0800 | [diff] [blame] | 43 | { |
| 44 | if (lhs->tv_sec < rhs->tv_sec) |
| 45 | return -1; |
| 46 | if (lhs->tv_sec > rhs->tv_sec) |
| 47 | return 1; |
| 48 | return lhs->tv_usec - rhs->tv_usec; |
| 49 | } |
| 50 | |
Ingo Molnar | f481890 | 2006-01-09 20:52:23 -0800 | [diff] [blame] | 51 | extern unsigned long mktime(const unsigned int year, const unsigned int mon, |
| 52 | const unsigned int day, const unsigned int hour, |
| 53 | const unsigned int min, const unsigned int sec); |
| 54 | |
Thomas Gleixner | 12e0933 | 2009-09-14 23:37:40 +0200 | [diff] [blame] | 55 | extern void set_normalized_timespec(struct timespec *ts, time_t sec, s64 nsec); |
John Stultz | ce3bf7a | 2010-07-13 17:56:19 -0700 | [diff] [blame] | 56 | |
| 57 | /* |
| 58 | * timespec_add_safe assumes both values are positive and checks |
| 59 | * for overflow. It will return TIME_T_MAX if the reutrn would be |
| 60 | * smaller then either of the arguments. |
| 61 | */ |
Thomas Gleixner | df0cc05 | 2008-08-31 08:09:53 -0700 | [diff] [blame] | 62 | extern struct timespec timespec_add_safe(const struct timespec lhs, |
| 63 | const struct timespec rhs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 64 | |
John Stultz | ce3bf7a | 2010-07-13 17:56:19 -0700 | [diff] [blame] | 65 | |
| 66 | static inline struct timespec timespec_add(struct timespec lhs, |
| 67 | struct timespec rhs) |
| 68 | { |
| 69 | struct timespec ts_delta; |
| 70 | set_normalized_timespec(&ts_delta, lhs.tv_sec + rhs.tv_sec, |
| 71 | lhs.tv_nsec + rhs.tv_nsec); |
| 72 | return ts_delta; |
| 73 | } |
| 74 | |
Thomas Gleixner | 5f82b2b | 2006-01-09 20:52:29 -0800 | [diff] [blame] | 75 | /* |
Shailabh Nagar | ca74e92 | 2006-07-14 00:24:36 -0700 | [diff] [blame] | 76 | * sub = lhs - rhs, in normalized form |
| 77 | */ |
| 78 | static inline struct timespec timespec_sub(struct timespec lhs, |
| 79 | struct timespec rhs) |
| 80 | { |
| 81 | struct timespec ts_delta; |
| 82 | set_normalized_timespec(&ts_delta, lhs.tv_sec - rhs.tv_sec, |
| 83 | lhs.tv_nsec - rhs.tv_nsec); |
| 84 | return ts_delta; |
| 85 | } |
| 86 | |
John Stultz | 4e8b145 | 2012-08-08 15:36:20 -0400 | [diff] [blame] | 87 | #define KTIME_MAX ((s64)~((u64)1 << 63)) |
| 88 | #if (BITS_PER_LONG == 64) |
| 89 | # define KTIME_SEC_MAX (KTIME_MAX / NSEC_PER_SEC) |
| 90 | #else |
| 91 | # define KTIME_SEC_MAX LONG_MAX |
| 92 | #endif |
| 93 | |
Shailabh Nagar | ca74e92 | 2006-07-14 00:24:36 -0700 | [diff] [blame] | 94 | /* |
Thomas Gleixner | 5f82b2b | 2006-01-09 20:52:29 -0800 | [diff] [blame] | 95 | * Returns true if the timespec is norm, false if denorm: |
| 96 | */ |
John Stultz | 4e8b145 | 2012-08-08 15:36:20 -0400 | [diff] [blame] | 97 | static inline bool timespec_valid(const struct timespec *ts) |
| 98 | { |
| 99 | /* Dates before 1970 are bogus */ |
| 100 | if (ts->tv_sec < 0) |
| 101 | return false; |
| 102 | /* Can't have more nanoseconds then a second */ |
| 103 | if ((unsigned long)ts->tv_nsec >= NSEC_PER_SEC) |
| 104 | return false; |
John Stultz | cee5848 | 2012-08-31 13:30:06 -0400 | [diff] [blame] | 105 | return true; |
| 106 | } |
| 107 | |
| 108 | static inline bool timespec_valid_strict(const struct timespec *ts) |
| 109 | { |
| 110 | if (!timespec_valid(ts)) |
| 111 | return false; |
John Stultz | 4e8b145 | 2012-08-08 15:36:20 -0400 | [diff] [blame] | 112 | /* Disallow values that could overflow ktime_t */ |
| 113 | if ((unsigned long long)ts->tv_sec >= KTIME_SEC_MAX) |
| 114 | return false; |
| 115 | return true; |
| 116 | } |
Thomas Gleixner | 5f82b2b | 2006-01-09 20:52:29 -0800 | [diff] [blame] | 117 | |
Feng Tang | 31ade30 | 2013-01-16 00:09:47 +0800 | [diff] [blame] | 118 | extern bool persistent_clock_exist; |
Feng Tang | 05ad717 | 2013-01-16 00:09:49 +0800 | [diff] [blame^] | 119 | |
| 120 | #ifdef CONFIG_HAS_PERSISTENT_CLOCK |
| 121 | #define has_persistent_clock() true |
| 122 | #else |
Feng Tang | 31ade30 | 2013-01-16 00:09:47 +0800 | [diff] [blame] | 123 | static inline bool has_persistent_clock(void) |
| 124 | { |
| 125 | return persistent_clock_exist; |
| 126 | } |
Feng Tang | 05ad717 | 2013-01-16 00:09:49 +0800 | [diff] [blame^] | 127 | #endif |
Feng Tang | 31ade30 | 2013-01-16 00:09:47 +0800 | [diff] [blame] | 128 | |
Martin Schwidefsky | d4f587c | 2009-08-14 15:47:31 +0200 | [diff] [blame] | 129 | extern void read_persistent_clock(struct timespec *ts); |
Martin Schwidefsky | 23970e3 | 2009-08-14 15:47:32 +0200 | [diff] [blame] | 130 | extern void read_boot_clock(struct timespec *ts); |
Thomas Gleixner | 8264445 | 2007-07-21 04:37:37 -0700 | [diff] [blame] | 131 | extern int update_persistent_clock(struct timespec now); |
john stultz | ad59617 | 2006-06-26 00:25:06 -0700 | [diff] [blame] | 132 | void timekeeping_init(void); |
Thomas Gleixner | 1c5745a | 2008-12-22 23:05:28 +0100 | [diff] [blame] | 133 | extern int timekeeping_suspended; |
john stultz | ad59617 | 2006-06-26 00:25:06 -0700 | [diff] [blame] | 134 | |
john stultz | 17c38b7 | 2007-07-24 18:38:34 -0700 | [diff] [blame] | 135 | unsigned long get_seconds(void); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 136 | struct timespec current_kernel_time(void); |
John Stultz | 8ab4351 | 2010-07-13 17:56:25 -0700 | [diff] [blame] | 137 | struct timespec __current_kernel_time(void); /* does not take xtime_lock */ |
john stultz | da15cfd | 2009-08-19 19:13:34 -0700 | [diff] [blame] | 138 | struct timespec get_monotonic_coarse(void); |
John Stultz | 314ac37 | 2011-02-14 18:43:08 -0800 | [diff] [blame] | 139 | void get_xtime_and_monotonic_and_sleep_offset(struct timespec *xtim, |
| 140 | struct timespec *wtom, struct timespec *sleep); |
John Stultz | 304529b | 2011-04-01 14:32:09 -0700 | [diff] [blame] | 141 | void timekeeping_inject_sleeptime(struct timespec *delta); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 142 | |
Ingo Molnar | 57a5587 | 2006-01-09 20:52:26 -0800 | [diff] [blame] | 143 | #define CURRENT_TIME (current_kernel_time()) |
john stultz | 2c6b47d | 2007-07-24 17:47:43 -0700 | [diff] [blame] | 144 | #define CURRENT_TIME_SEC ((struct timespec) { get_seconds(), 0 }) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 145 | |
john stultz | 7d27558 | 2009-05-01 13:10:26 -0700 | [diff] [blame] | 146 | /* Some architectures do not supply their own clocksource. |
| 147 | * This is mainly the case in architectures that get their |
| 148 | * inter-tick times by reading the counter on their interval |
| 149 | * timer. Since these timers wrap every tick, they're not really |
| 150 | * useful as clocksources. Wrapping them to act like one is possible |
| 151 | * but not very efficient. So we provide a callout these arches |
| 152 | * can implement for use with the jiffies clocksource to provide |
| 153 | * finer then tick granular time. |
| 154 | */ |
| 155 | #ifdef CONFIG_ARCH_USES_GETTIMEOFFSET |
| 156 | extern u32 arch_gettimeoffset(void); |
| 157 | #else |
| 158 | static inline u32 arch_gettimeoffset(void) { return 0; } |
| 159 | #endif |
| 160 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 161 | extern void do_gettimeofday(struct timeval *tv); |
Richard Cochran | 1e6d767 | 2011-02-01 13:50:58 +0000 | [diff] [blame] | 162 | extern int do_settimeofday(const struct timespec *tv); |
| 163 | extern int do_sys_settimeofday(const struct timespec *tv, |
| 164 | const struct timezone *tz); |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 165 | #define do_posix_clock_monotonic_gettime(ts) ktime_get_ts(ts) |
David Howells | c788732 | 2010-08-11 11:26:22 +0100 | [diff] [blame] | 166 | extern long do_utimes(int dfd, const char __user *filename, struct timespec *times, int flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 167 | struct itimerval; |
Ingo Molnar | 57a5587 | 2006-01-09 20:52:26 -0800 | [diff] [blame] | 168 | extern int do_setitimer(int which, struct itimerval *value, |
| 169 | struct itimerval *ovalue); |
Thomas Gleixner | c08b8a4 | 2006-03-25 03:06:33 -0800 | [diff] [blame] | 170 | extern unsigned int alarm_setitimer(unsigned int seconds); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 171 | extern int do_getitimer(int which, struct itimerval *value); |
Kees Cook | 1e817fb | 2012-11-19 10:26:16 -0800 | [diff] [blame] | 172 | extern int __getnstimeofday(struct timespec *tv); |
Ingo Molnar | 57a5587 | 2006-01-09 20:52:26 -0800 | [diff] [blame] | 173 | extern void getnstimeofday(struct timespec *tv); |
John Stultz | 2d42244 | 2008-08-20 16:37:30 -0700 | [diff] [blame] | 174 | extern void getrawmonotonic(struct timespec *ts); |
Alexander Gordeev | e2c18e4 | 2011-01-12 17:00:57 -0800 | [diff] [blame] | 175 | extern void getnstime_raw_and_real(struct timespec *ts_raw, |
| 176 | struct timespec *ts_real); |
Tomas Janousek | 7c3f1a5 | 2007-07-15 23:39:41 -0700 | [diff] [blame] | 177 | extern void getboottime(struct timespec *ts); |
| 178 | extern void monotonic_to_bootbased(struct timespec *ts); |
John Stultz | abb3a4e | 2011-02-14 17:52:09 -0800 | [diff] [blame] | 179 | extern void get_monotonic_boottime(struct timespec *ts); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 180 | |
| 181 | extern struct timespec timespec_trunc(struct timespec t, unsigned gran); |
Li Zefan | cf4fc6c | 2008-02-08 04:19:24 -0800 | [diff] [blame] | 182 | extern int timekeeping_valid_for_hres(void); |
Jon Hunter | 9896246 | 2009-08-18 12:45:10 -0500 | [diff] [blame] | 183 | extern u64 timekeeping_max_deferment(void); |
John Stultz | c528f7c | 2011-02-01 13:52:17 +0000 | [diff] [blame] | 184 | extern int timekeeping_inject_offset(struct timespec *ts); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 185 | |
Frank Mayhar | f06febc | 2008-09-12 09:54:39 -0700 | [diff] [blame] | 186 | struct tms; |
| 187 | extern void do_sys_times(struct tms *); |
| 188 | |
Zhaolei | 57f1f08 | 2009-09-23 15:56:10 -0700 | [diff] [blame] | 189 | /* |
| 190 | * Similar to the struct tm in userspace <time.h>, but it needs to be here so |
| 191 | * that the kernel source is self contained. |
| 192 | */ |
| 193 | struct tm { |
| 194 | /* |
| 195 | * the number of seconds after the minute, normally in the range |
| 196 | * 0 to 59, but can be up to 60 to allow for leap seconds |
| 197 | */ |
| 198 | int tm_sec; |
| 199 | /* the number of minutes after the hour, in the range 0 to 59*/ |
| 200 | int tm_min; |
| 201 | /* the number of hours past midnight, in the range 0 to 23 */ |
| 202 | int tm_hour; |
| 203 | /* the day of the month, in the range 1 to 31 */ |
| 204 | int tm_mday; |
| 205 | /* the number of months since January, in the range 0 to 11 */ |
| 206 | int tm_mon; |
| 207 | /* the number of years since 1900 */ |
| 208 | long tm_year; |
| 209 | /* the number of days since Sunday, in the range 0 to 6 */ |
| 210 | int tm_wday; |
| 211 | /* the number of days since January 1, in the range 0 to 365 */ |
| 212 | int tm_yday; |
| 213 | }; |
| 214 | |
| 215 | void time_to_tm(time_t totalsecs, int offset, struct tm *result); |
| 216 | |
Thomas Gleixner | f8f46da | 2006-01-09 20:52:30 -0800 | [diff] [blame] | 217 | /** |
| 218 | * timespec_to_ns - Convert timespec to nanoseconds |
| 219 | * @ts: pointer to the timespec variable to be converted |
| 220 | * |
| 221 | * Returns the scalar nanosecond representation of the timespec |
| 222 | * parameter. |
| 223 | */ |
Roman Zippel | df869b6 | 2006-03-26 01:38:11 -0800 | [diff] [blame] | 224 | static inline s64 timespec_to_ns(const struct timespec *ts) |
Thomas Gleixner | f8f46da | 2006-01-09 20:52:30 -0800 | [diff] [blame] | 225 | { |
Roman Zippel | df869b6 | 2006-03-26 01:38:11 -0800 | [diff] [blame] | 226 | return ((s64) ts->tv_sec * NSEC_PER_SEC) + ts->tv_nsec; |
Thomas Gleixner | f8f46da | 2006-01-09 20:52:30 -0800 | [diff] [blame] | 227 | } |
| 228 | |
| 229 | /** |
| 230 | * timeval_to_ns - Convert timeval to nanoseconds |
| 231 | * @ts: pointer to the timeval variable to be converted |
| 232 | * |
| 233 | * Returns the scalar nanosecond representation of the timeval |
| 234 | * parameter. |
| 235 | */ |
Roman Zippel | df869b6 | 2006-03-26 01:38:11 -0800 | [diff] [blame] | 236 | static inline s64 timeval_to_ns(const struct timeval *tv) |
Thomas Gleixner | f8f46da | 2006-01-09 20:52:30 -0800 | [diff] [blame] | 237 | { |
Roman Zippel | df869b6 | 2006-03-26 01:38:11 -0800 | [diff] [blame] | 238 | return ((s64) tv->tv_sec * NSEC_PER_SEC) + |
Thomas Gleixner | f8f46da | 2006-01-09 20:52:30 -0800 | [diff] [blame] | 239 | tv->tv_usec * NSEC_PER_USEC; |
| 240 | } |
| 241 | |
| 242 | /** |
| 243 | * ns_to_timespec - Convert nanoseconds to timespec |
| 244 | * @nsec: the nanoseconds value to be converted |
| 245 | * |
| 246 | * Returns the timespec representation of the nsec parameter. |
| 247 | */ |
Roman Zippel | df869b6 | 2006-03-26 01:38:11 -0800 | [diff] [blame] | 248 | extern struct timespec ns_to_timespec(const s64 nsec); |
Thomas Gleixner | f8f46da | 2006-01-09 20:52:30 -0800 | [diff] [blame] | 249 | |
| 250 | /** |
| 251 | * ns_to_timeval - Convert nanoseconds to timeval |
| 252 | * @nsec: the nanoseconds value to be converted |
| 253 | * |
| 254 | * Returns the timeval representation of the nsec parameter. |
| 255 | */ |
Roman Zippel | df869b6 | 2006-03-26 01:38:11 -0800 | [diff] [blame] | 256 | extern struct timeval ns_to_timeval(const s64 nsec); |
Thomas Gleixner | f8f46da | 2006-01-09 20:52:30 -0800 | [diff] [blame] | 257 | |
john stultz | cf3c769 | 2006-06-26 00:25:08 -0700 | [diff] [blame] | 258 | /** |
| 259 | * timespec_add_ns - Adds nanoseconds to a timespec |
| 260 | * @a: pointer to timespec to be incremented |
| 261 | * @ns: unsigned nanoseconds value to be added |
Jeremy Fitzhardinge | 9412e286 | 2008-06-12 10:48:00 +0200 | [diff] [blame] | 262 | * |
| 263 | * This must always be inlined because its used from the x86-64 vdso, |
| 264 | * which cannot call other kernel functions. |
john stultz | cf3c769 | 2006-06-26 00:25:08 -0700 | [diff] [blame] | 265 | */ |
Jeremy Fitzhardinge | 9412e286 | 2008-06-12 10:48:00 +0200 | [diff] [blame] | 266 | static __always_inline void timespec_add_ns(struct timespec *a, u64 ns) |
john stultz | cf3c769 | 2006-06-26 00:25:08 -0700 | [diff] [blame] | 267 | { |
Jeremy Fitzhardinge | 9412e286 | 2008-06-12 10:48:00 +0200 | [diff] [blame] | 268 | a->tv_sec += __iter_div_u64_rem(a->tv_nsec + ns, NSEC_PER_SEC, &ns); |
john stultz | cf3c769 | 2006-06-26 00:25:08 -0700 | [diff] [blame] | 269 | a->tv_nsec = ns; |
| 270 | } |
H. Peter Anvin | 8b3d1cd | 2012-02-07 21:09:05 -0800 | [diff] [blame] | 271 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 272 | #endif |