1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _LINUX_TIMEKEEPING_H 3 #define _LINUX_TIMEKEEPING_H 4 5 #include <linux/errno.h> 6 7 /* Included from linux/ktime.h */ 8 9 void timekeeping_init(void); 10 extern int timekeeping_suspended; 11 12 /* Architecture timer tick functions: */ 13 extern void update_process_times(int user); 14 extern void xtime_update(unsigned long ticks); 15 16 /* 17 * Get and set timeofday 18 */ 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 struct timespec64 current_kernel_time64(void); 26 27 /* 28 * timespec64 based interfaces 29 */ 30 struct timespec64 get_monotonic_coarse64(void); 31 extern void getrawmonotonic64(struct timespec64 *ts); 32 extern void ktime_get_ts64(struct timespec64 *ts); 33 extern time64_t ktime_get_seconds(void); 34 extern time64_t ktime_get_real_seconds(void); 35 36 extern int __getnstimeofday64(struct timespec64 *tv); 37 extern void getnstimeofday64(struct timespec64 *tv); 38 extern void getboottime64(struct timespec64 *ts); 39 40 #define ktime_get_real_ts64(ts) getnstimeofday64(ts) 41 42 /* 43 * ktime_t based interfaces 44 */ 45 46 enum tk_offsets { 47 TK_OFFS_REAL, 48 TK_OFFS_BOOT, 49 TK_OFFS_TAI, 50 TK_OFFS_MAX, 51 }; 52 53 extern ktime_t ktime_get(void); 54 extern ktime_t ktime_get_with_offset(enum tk_offsets offs); 55 extern ktime_t ktime_mono_to_any(ktime_t tmono, enum tk_offsets offs); 56 extern ktime_t ktime_get_raw(void); 57 extern u32 ktime_get_resolution_ns(void); 58 59 /** 60 * ktime_get_real - get the real (wall-) time in ktime_t format 61 */ 62 static inline ktime_t ktime_get_real(void) 63 { 64 return ktime_get_with_offset(TK_OFFS_REAL); 65 } 66 67 /** 68 * ktime_get_boottime - Returns monotonic time since boot in ktime_t format 69 * 70 * This is similar to CLOCK_MONTONIC/ktime_get, but also includes the 71 * time spent in suspend. 72 */ 73 static inline ktime_t ktime_get_boottime(void) 74 { 75 return ktime_get_with_offset(TK_OFFS_BOOT); 76 } 77 78 /** 79 * ktime_get_clocktai - Returns the TAI time of day in ktime_t format 80 */ 81 static inline ktime_t ktime_get_clocktai(void) 82 { 83 return ktime_get_with_offset(TK_OFFS_TAI); 84 } 85 86 /** 87 * ktime_mono_to_real - Convert monotonic time to clock realtime 88 */ 89 static inline ktime_t ktime_mono_to_real(ktime_t mono) 90 { 91 return ktime_mono_to_any(mono, TK_OFFS_REAL); 92 } 93 94 static inline u64 ktime_get_ns(void) 95 { 96 return ktime_to_ns(ktime_get()); 97 } 98 99 static inline u64 ktime_get_real_ns(void) 100 { 101 return ktime_to_ns(ktime_get_real()); 102 } 103 104 static inline u64 ktime_get_boot_ns(void) 105 { 106 return ktime_to_ns(ktime_get_boottime()); 107 } 108 109 static inline u64 ktime_get_tai_ns(void) 110 { 111 return ktime_to_ns(ktime_get_clocktai()); 112 } 113 114 static inline u64 ktime_get_raw_ns(void) 115 { 116 return ktime_to_ns(ktime_get_raw()); 117 } 118 119 extern u64 ktime_get_mono_fast_ns(void); 120 extern u64 ktime_get_raw_fast_ns(void); 121 extern u64 ktime_get_boot_fast_ns(void); 122 extern u64 ktime_get_real_fast_ns(void); 123 124 /* 125 * timespec64 interfaces utilizing the ktime based ones 126 */ 127 static inline void get_monotonic_boottime64(struct timespec64 *ts) 128 { 129 *ts = ktime_to_timespec64(ktime_get_boottime()); 130 } 131 132 static inline void timekeeping_clocktai64(struct timespec64 *ts) 133 { 134 *ts = ktime_to_timespec64(ktime_get_clocktai()); 135 } 136 137 /* 138 * RTC specific 139 */ 140 extern bool timekeeping_rtc_skipsuspend(void); 141 extern bool timekeeping_rtc_skipresume(void); 142 143 extern void timekeeping_inject_sleeptime64(struct timespec64 *delta); 144 145 /* 146 * struct system_time_snapshot - simultaneous raw/real time capture with 147 * counter value 148 * @cycles: Clocksource counter value to produce the system times 149 * @real: Realtime system time 150 * @raw: Monotonic raw system time 151 * @clock_was_set_seq: The sequence number of clock was set events 152 * @cs_was_changed_seq: The sequence number of clocksource change events 153 */ 154 struct system_time_snapshot { 155 u64 cycles; 156 ktime_t real; 157 ktime_t raw; 158 unsigned int clock_was_set_seq; 159 u8 cs_was_changed_seq; 160 }; 161 162 /* 163 * struct system_device_crosststamp - system/device cross-timestamp 164 * (syncronized capture) 165 * @device: Device time 166 * @sys_realtime: Realtime simultaneous with device time 167 * @sys_monoraw: Monotonic raw simultaneous with device time 168 */ 169 struct system_device_crosststamp { 170 ktime_t device; 171 ktime_t sys_realtime; 172 ktime_t sys_monoraw; 173 }; 174 175 /* 176 * struct system_counterval_t - system counter value with the pointer to the 177 * corresponding clocksource 178 * @cycles: System counter value 179 * @cs: Clocksource corresponding to system counter value. Used by 180 * timekeeping code to verify comparibility of two cycle values 181 */ 182 struct system_counterval_t { 183 u64 cycles; 184 struct clocksource *cs; 185 }; 186 187 /* 188 * Get cross timestamp between system clock and device clock 189 */ 190 extern int get_device_system_crosststamp( 191 int (*get_time_fn)(ktime_t *device_time, 192 struct system_counterval_t *system_counterval, 193 void *ctx), 194 void *ctx, 195 struct system_time_snapshot *history, 196 struct system_device_crosststamp *xtstamp); 197 198 /* 199 * Simultaneously snapshot realtime and monotonic raw clocks 200 */ 201 extern void ktime_get_snapshot(struct system_time_snapshot *systime_snapshot); 202 203 /* 204 * Persistent clock related interfaces 205 */ 206 extern int persistent_clock_is_local; 207 208 extern void read_persistent_clock64(struct timespec64 *ts); 209 extern void read_boot_clock64(struct timespec64 *ts); 210 extern int update_persistent_clock64(struct timespec64 now); 211 212 213 #endif 214