include/linux/timekeeping.h

   1 #ifndef _LINUX_TIMEKEEPING_H
   2 #define _LINUX_TIMEKEEPING_H
   3
   4 /* Included from linux/ktime.h */
   5
   6 void timekeeping_init(void);
   7 extern int timekeeping_suspended;
   8
   9 /*
  10  * Get and set timeofday
  11  */
  12 extern void do_gettimeofday(struct timeval *tv);
  13 extern int do_settimeofday(const struct timespec *tv);
  14 extern int do_sys_settimeofday(const struct timespec *tv,
  15                                const struct timezone *tz);
  16
  17 /*
  18  * Kernel time accessors
  19  */
  20 unsigned long get_seconds(void);
  21 struct timespec current_kernel_time(void);
  22 /* does not take xtime_lock */
  23 struct timespec __current_kernel_time(void);
  24
  25 /*
  26  * timespec based interfaces
  27  */
  28 struct timespec get_monotonic_coarse(void);
  29 extern void getrawmonotonic(struct timespec *ts);
  30 extern void ktime_get_ts64(struct timespec64 *ts);
  31
  32 extern int __getnstimeofday64(struct timespec64 *tv);
  33 extern void getnstimeofday64(struct timespec64 *tv);
  34
  35 #if BITS_PER_LONG == 64
  36 static inline int __getnstimeofday(struct timespec *ts)
  37 {
  38         return __getnstimeofday64(ts);
  39 }
  40
  41 static inline void getnstimeofday(struct timespec *ts)
  42 {
  43         getnstimeofday64(ts);
  44 }
  45
  46 static inline void ktime_get_ts(struct timespec *ts)
  47 {
  48         ktime_get_ts64(ts);
  49 }
  50
  51 static inline void ktime_get_real_ts(struct timespec *ts)
  52 {
  53         getnstimeofday64(ts);
  54 }
  55
  56 #else
  57 static inline int __getnstimeofday(struct timespec *ts)
  58 {
  59         struct timespec64 ts64;
  60         int ret = __getnstimeofday64(&ts64);
  61
  62         *ts = timespec64_to_timespec(ts64);
  63         return ret;
  64 }
  65
  66 static inline void getnstimeofday(struct timespec *ts)
  67 {
  68         struct timespec64 ts64;
  69
  70         getnstimeofday64(&ts64);
  71         *ts = timespec64_to_timespec(ts64);
  72 }
  73
  74 static inline void ktime_get_ts(struct timespec *ts)
  75 {
  76         struct timespec64 ts64;
  77
  78         ktime_get_ts64(&ts64);
  79         *ts = timespec64_to_timespec(ts64);
  80 }
  81
  82 static inline void ktime_get_real_ts(struct timespec *ts)
  83 {
  84         struct timespec64 ts64;
  85
  86         getnstimeofday64(&ts64);
  87         *ts = timespec64_to_timespec(ts64);
  88 }
  89 #endif
  90
  91 extern void getboottime(struct timespec *ts);
  92
  93 #define do_posix_clock_monotonic_gettime(ts) ktime_get_ts(ts)
  94 #define ktime_get_real_ts64(ts) getnstimeofday64(ts)
  95
  96 /*
  97  * ktime_t based interfaces
  98  */
  99
 100 enum tk_offsets {
 101         TK_OFFS_REAL,
 102         TK_OFFS_BOOT,
 103         TK_OFFS_TAI,
 104         TK_OFFS_MAX,
 105 };
 106
 107 extern ktime_t ktime_get(void);
 108 extern ktime_t ktime_get_with_offset(enum tk_offsets offs);
 109 extern ktime_t ktime_mono_to_any(ktime_t tmono, enum tk_offsets offs);
 110 extern ktime_t ktime_get_raw(void);
 111
 112 /**
 113  * ktime_get_real - get the real (wall-) time in ktime_t format
 114  */
 115 static inline ktime_t ktime_get_real(void)
 116 {
 117         return ktime_get_with_offset(TK_OFFS_REAL);
 118 }
 119
 120 /**
 121  * ktime_get_boottime - Returns monotonic time since boot in ktime_t format
 122  *
 123  * This is similar to CLOCK_MONTONIC/ktime_get, but also includes the
 124  * time spent in suspend.
 125  */
 126 static inline ktime_t ktime_get_boottime(void)
 127 {
 128         return ktime_get_with_offset(TK_OFFS_BOOT);
 129 }
 130
 131 /**
 132  * ktime_get_clocktai - Returns the TAI time of day in ktime_t format
 133  */
 134 static inline ktime_t ktime_get_clocktai(void)
 135 {
 136         return ktime_get_with_offset(TK_OFFS_TAI);
 137 }
 138
 139 /**
 140  * ktime_mono_to_real - Convert monotonic time to clock realtime
 141  */
 142 static inline ktime_t ktime_mono_to_real(ktime_t mono)
 143 {
 144         return ktime_mono_to_any(mono, TK_OFFS_REAL);
 145 }
 146
 147 static inline u64 ktime_get_ns(void)
 148 {
 149         return ktime_to_ns(ktime_get());
 150 }
 151
 152 static inline u64 ktime_get_real_ns(void)
 153 {
 154         return ktime_to_ns(ktime_get_real());
 155 }
 156
 157 static inline u64 ktime_get_boot_ns(void)
 158 {
 159         return ktime_to_ns(ktime_get_boottime());
 160 }
 161
 162 static inline u64 ktime_get_raw_ns(void)
 163 {
 164         return ktime_to_ns(ktime_get_raw());
 165 }
 166
 167 extern u64 ktime_get_mono_fast_ns(void);
 168
 169 /*
 170  * Timespec interfaces utilizing the ktime based ones
 171  */
 172 static inline void get_monotonic_boottime(struct timespec *ts)
 173 {
 174         *ts = ktime_to_timespec(ktime_get_boottime());
 175 }
 176
 177 static inline void timekeeping_clocktai(struct timespec *ts)
 178 {
 179         *ts = ktime_to_timespec(ktime_get_clocktai());
 180 }
 181
 182 /*
 183  * RTC specific
 184  */
 185 extern void timekeeping_inject_sleeptime(struct timespec *delta);
 186
 187 /*
 188  * PPS accessor
 189  */
 190 extern void getnstime_raw_and_real(struct timespec *ts_raw,
 191                                    struct timespec *ts_real);
 192
 193 /*
 194  * Persistent clock related interfaces
 195  */
 196 extern bool persistent_clock_exist;
 197 extern int persistent_clock_is_local;
 198
 199 static inline bool has_persistent_clock(void)
 200 {
 201         return persistent_clock_exist;
 202 }
 203
 204 extern void read_persistent_clock(struct timespec *ts);
 205 extern void read_boot_clock(struct timespec *ts);
 206 extern int update_persistent_clock(struct timespec now);
 207
 208
 209 #endif