include/linux/timekeeping.h

   1 #ifndef _LINUX_TIMEKEEPING_H
   2 #define _LINUX_TIMEKEEPING_H
   3
   4 #include <linux/errno.h>
   5
   6 /* Included from linux/ktime.h */
   7
   8 void timekeeping_init(void);
   9 extern int timekeeping_suspended;
  10
  11 /* Architecture timer tick functions: */
  12 extern void update_process_times(int user);
  13 extern void xtime_update(unsigned long ticks);
  14
  15 /*
  16  * Get and set timeofday
  17  */
  18 extern void do_gettimeofday(struct timeval *tv);
  19 extern int do_settimeofday64(const struct timespec64 *ts);
  20 extern int do_sys_settimeofday64(const struct timespec64 *tv,
  21                                  const struct timezone *tz);
  22 /*
  23  * Kernel time accessors
  24  */
  25 unsigned long get_seconds(void);
  26 struct timespec64 current_kernel_time64(void);
  27 /* does not take xtime_lock */
  28 struct timespec __current_kernel_time(void);
  29
  30 static inline struct timespec current_kernel_time(void)
  31 {
  32         struct timespec64 now = current_kernel_time64();
  33
  34         return timespec64_to_timespec(now);
  35 }
  36
  37 /*
  38  * timespec based interfaces
  39  */
  40 struct timespec64 get_monotonic_coarse64(void);
  41 extern void getrawmonotonic64(struct timespec64 *ts);
  42 extern void ktime_get_ts64(struct timespec64 *ts);
  43 extern time64_t ktime_get_seconds(void);
  44 extern time64_t ktime_get_real_seconds(void);
  45
  46 extern int __getnstimeofday64(struct timespec64 *tv);
  47 extern void getnstimeofday64(struct timespec64 *tv);
  48 extern void getboottime64(struct timespec64 *ts);
  49
  50 #if BITS_PER_LONG == 64
  51 /**
  52  * Deprecated. Use do_settimeofday64().
  53  */
  54 static inline int do_settimeofday(const struct timespec *ts)
  55 {
  56         return do_settimeofday64(ts);
  57 }
  58
  59 static inline int __getnstimeofday(struct timespec *ts)
  60 {
  61         return __getnstimeofday64(ts);
  62 }
  63
  64 static inline void getnstimeofday(struct timespec *ts)
  65 {
  66         getnstimeofday64(ts);
  67 }
  68
  69 static inline void ktime_get_ts(struct timespec *ts)
  70 {
  71         ktime_get_ts64(ts);
  72 }
  73
  74 static inline void ktime_get_real_ts(struct timespec *ts)
  75 {
  76         getnstimeofday64(ts);
  77 }
  78
  79 static inline void getrawmonotonic(struct timespec *ts)
  80 {
  81         getrawmonotonic64(ts);
  82 }
  83
  84 static inline struct timespec get_monotonic_coarse(void)
  85 {
  86         return get_monotonic_coarse64();
  87 }
  88
  89 static inline void getboottime(struct timespec *ts)
  90 {
  91         return getboottime64(ts);
  92 }
  93 #else
  94 /**
  95  * Deprecated. Use do_settimeofday64().
  96  */
  97 static inline int do_settimeofday(const struct timespec *ts)
  98 {
  99         struct timespec64 ts64;
 100
 101         ts64 = timespec_to_timespec64(*ts);
 102         return do_settimeofday64(&ts64);
 103 }
 104
 105 static inline int __getnstimeofday(struct timespec *ts)
 106 {
 107         struct timespec64 ts64;
 108         int ret = __getnstimeofday64(&ts64);
 109
 110         *ts = timespec64_to_timespec(ts64);
 111         return ret;
 112 }
 113
 114 static inline void getnstimeofday(struct timespec *ts)
 115 {
 116         struct timespec64 ts64;
 117
 118         getnstimeofday64(&ts64);
 119         *ts = timespec64_to_timespec(ts64);
 120 }
 121
 122 static inline void ktime_get_ts(struct timespec *ts)
 123 {
 124         struct timespec64 ts64;
 125
 126         ktime_get_ts64(&ts64);
 127         *ts = timespec64_to_timespec(ts64);
 128 }
 129
 130 static inline void ktime_get_real_ts(struct timespec *ts)
 131 {
 132         struct timespec64 ts64;
 133
 134         getnstimeofday64(&ts64);
 135         *ts = timespec64_to_timespec(ts64);
 136 }
 137
 138 static inline void getrawmonotonic(struct timespec *ts)
 139 {
 140         struct timespec64 ts64;
 141
 142         getrawmonotonic64(&ts64);
 143         *ts = timespec64_to_timespec(ts64);
 144 }
 145
 146 static inline struct timespec get_monotonic_coarse(void)
 147 {
 148         return timespec64_to_timespec(get_monotonic_coarse64());
 149 }
 150
 151 static inline void getboottime(struct timespec *ts)
 152 {
 153         struct timespec64 ts64;
 154
 155         getboottime64(&ts64);
 156         *ts = timespec64_to_timespec(ts64);
 157 }
 158 #endif
 159
 160 #define ktime_get_real_ts64(ts) getnstimeofday64(ts)
 161
 162 /*
 163  * ktime_t based interfaces
 164  */
 165
 166 enum tk_offsets {
 167         TK_OFFS_REAL,
 168         TK_OFFS_BOOT,
 169         TK_OFFS_TAI,
 170         TK_OFFS_MAX,
 171 };
 172
 173 extern ktime_t ktime_get(void);
 174 extern ktime_t ktime_get_with_offset(enum tk_offsets offs);
 175 extern ktime_t ktime_mono_to_any(ktime_t tmono, enum tk_offsets offs);
 176 extern ktime_t ktime_get_raw(void);
 177 extern u32 ktime_get_resolution_ns(void);
 178
 179 /**
 180  * ktime_get_real - get the real (wall-) time in ktime_t format
 181  */
 182 static inline ktime_t ktime_get_real(void)
 183 {
 184         return ktime_get_with_offset(TK_OFFS_REAL);
 185 }
 186
 187 /**
 188  * ktime_get_boottime - Returns monotonic time since boot in ktime_t format
 189  *
 190  * This is similar to CLOCK_MONTONIC/ktime_get, but also includes the
 191  * time spent in suspend.
 192  */
 193 static inline ktime_t ktime_get_boottime(void)
 194 {
 195         return ktime_get_with_offset(TK_OFFS_BOOT);
 196 }
 197
 198 /**
 199  * ktime_get_clocktai - Returns the TAI time of day in ktime_t format
 200  */
 201 static inline ktime_t ktime_get_clocktai(void)
 202 {
 203         return ktime_get_with_offset(TK_OFFS_TAI);
 204 }
 205
 206 /**
 207  * ktime_mono_to_real - Convert monotonic time to clock realtime
 208  */
 209 static inline ktime_t ktime_mono_to_real(ktime_t mono)
 210 {
 211         return ktime_mono_to_any(mono, TK_OFFS_REAL);
 212 }
 213
 214 static inline u64 ktime_get_ns(void)
 215 {
 216         return ktime_to_ns(ktime_get());
 217 }
 218
 219 static inline u64 ktime_get_real_ns(void)
 220 {
 221         return ktime_to_ns(ktime_get_real());
 222 }
 223
 224 static inline u64 ktime_get_boot_ns(void)
 225 {
 226         return ktime_to_ns(ktime_get_boottime());
 227 }
 228
 229 static inline u64 ktime_get_tai_ns(void)
 230 {
 231         return ktime_to_ns(ktime_get_clocktai());
 232 }
 233
 234 static inline u64 ktime_get_raw_ns(void)
 235 {
 236         return ktime_to_ns(ktime_get_raw());
 237 }
 238
 239 extern u64 ktime_get_mono_fast_ns(void);
 240 extern u64 ktime_get_raw_fast_ns(void);
 241 extern u64 ktime_get_boot_fast_ns(void);
 242
 243 /*
 244  * Timespec interfaces utilizing the ktime based ones
 245  */
 246 static inline void get_monotonic_boottime(struct timespec *ts)
 247 {
 248         *ts = ktime_to_timespec(ktime_get_boottime());
 249 }
 250
 251 static inline void get_monotonic_boottime64(struct timespec64 *ts)
 252 {
 253         *ts = ktime_to_timespec64(ktime_get_boottime());
 254 }
 255
 256 static inline void timekeeping_clocktai(struct timespec *ts)
 257 {
 258         *ts = ktime_to_timespec(ktime_get_clocktai());
 259 }
 260
 261 static inline void timekeeping_clocktai64(struct timespec64 *ts)
 262 {
 263         *ts = ktime_to_timespec64(ktime_get_clocktai());
 264 }
 265
 266 /*
 267  * RTC specific
 268  */
 269 extern bool timekeeping_rtc_skipsuspend(void);
 270 extern bool timekeeping_rtc_skipresume(void);
 271
 272 extern void timekeeping_inject_sleeptime64(struct timespec64 *delta);
 273
 274 /*
 275  * PPS accessor
 276  */
 277 extern void ktime_get_raw_and_real_ts64(struct timespec64 *ts_raw,
 278                                         struct timespec64 *ts_real);
 279
 280 /*
 281  * struct system_time_snapshot - simultaneous raw/real time capture with
 282  *      counter value
 283  * @cycles:     Clocksource counter value to produce the system times
 284  * @real:       Realtime system time
 285  * @raw:        Monotonic raw system time
 286  * @clock_was_set_seq:  The sequence number of clock was set events
 287  * @cs_was_changed_seq: The sequence number of clocksource change events
 288  */
 289 struct system_time_snapshot {
 290         u64             cycles;
 291         ktime_t         real;
 292         ktime_t         raw;
 293         unsigned int    clock_was_set_seq;
 294         u8              cs_was_changed_seq;
 295 };
 296
 297 /*
 298  * struct system_device_crosststamp - system/device cross-timestamp
 299  *      (syncronized capture)
 300  * @device:             Device time
 301  * @sys_realtime:       Realtime simultaneous with device time
 302  * @sys_monoraw:        Monotonic raw simultaneous with device time
 303  */
 304 struct system_device_crosststamp {
 305         ktime_t device;
 306         ktime_t sys_realtime;
 307         ktime_t sys_monoraw;
 308 };
 309
 310 /*
 311  * struct system_counterval_t - system counter value with the pointer to the
 312  *      corresponding clocksource
 313  * @cycles:     System counter value
 314  * @cs:         Clocksource corresponding to system counter value. Used by
 315  *      timekeeping code to verify comparibility of two cycle values
 316  */
 317 struct system_counterval_t {
 318         u64                     cycles;
 319         struct clocksource      *cs;
 320 };
 321
 322 /*
 323  * Get cross timestamp between system clock and device clock
 324  */
 325 extern int get_device_system_crosststamp(
 326                         int (*get_time_fn)(ktime_t *device_time,
 327                                 struct system_counterval_t *system_counterval,
 328                                 void *ctx),
 329                         void *ctx,
 330                         struct system_time_snapshot *history,
 331                         struct system_device_crosststamp *xtstamp);
 332
 333 /*
 334  * Simultaneously snapshot realtime and monotonic raw clocks
 335  */
 336 extern void ktime_get_snapshot(struct system_time_snapshot *systime_snapshot);
 337
 338 /*
 339  * Persistent clock related interfaces
 340  */
 341 extern int persistent_clock_is_local;
 342
 343 extern void read_persistent_clock(struct timespec *ts);
 344 extern void read_persistent_clock64(struct timespec64 *ts);
 345 extern void read_boot_clock64(struct timespec64 *ts);
 346 extern int update_persistent_clock(struct timespec now);
 347 extern int update_persistent_clock64(struct timespec64 now);
 348
 349
 350 #endif