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 /* 24 * ktime_get() family: read the current time in a multitude of ways, 25 * 26 * The default time reference is CLOCK_MONOTONIC, starting at 27 * boot time but not counting the time spent in suspend. 28 * For other references, use the functions with "real", "clocktai", 29 * "boottime" and "raw" suffixes. 30 * 31 * To get the time in a different format, use the ones wit 32 * "ns", "ts64" and "seconds" suffix. 33 * 34 * See Documentation/core-api/timekeeping.rst for more details. 35 */ 36 37 38 /* 39 * timespec64 based interfaces 40 */ 41 extern void ktime_get_raw_ts64(struct timespec64 *ts); 42 extern void ktime_get_ts64(struct timespec64 *ts); 43 extern void ktime_get_real_ts64(struct timespec64 *tv); 44 extern void ktime_get_coarse_ts64(struct timespec64 *ts); 45 extern void ktime_get_coarse_real_ts64(struct timespec64 *ts); 46 47 void getboottime64(struct timespec64 *ts); 48 49 /* 50 * time64_t base interfaces 51 */ 52 extern time64_t ktime_get_seconds(void); 53 extern time64_t __ktime_get_real_seconds(void); 54 extern time64_t ktime_get_real_seconds(void); 55 56 /* 57 * ktime_t based interfaces 58 */ 59 60 enum tk_offsets { 61 TK_OFFS_REAL, 62 TK_OFFS_BOOT, 63 TK_OFFS_TAI, 64 TK_OFFS_MAX, 65 }; 66 67 extern ktime_t ktime_get(void); 68 extern ktime_t ktime_get_with_offset(enum tk_offsets offs); 69 extern ktime_t ktime_get_coarse_with_offset(enum tk_offsets offs); 70 extern ktime_t ktime_mono_to_any(ktime_t tmono, enum tk_offsets offs); 71 extern ktime_t ktime_get_raw(void); 72 extern u32 ktime_get_resolution_ns(void); 73 74 /** 75 * ktime_get_real - get the real (wall-) time in ktime_t format 76 */ 77 static inline ktime_t ktime_get_real(void) 78 { 79 return ktime_get_with_offset(TK_OFFS_REAL); 80 } 81 82 static inline ktime_t ktime_get_coarse_real(void) 83 { 84 return ktime_get_coarse_with_offset(TK_OFFS_REAL); 85 } 86 87 /** 88 * ktime_get_boottime - Returns monotonic time since boot in ktime_t format 89 * 90 * This is similar to CLOCK_MONTONIC/ktime_get, but also includes the 91 * time spent in suspend. 92 */ 93 static inline ktime_t ktime_get_boottime(void) 94 { 95 return ktime_get_with_offset(TK_OFFS_BOOT); 96 } 97 98 static inline ktime_t ktime_get_coarse_boottime(void) 99 { 100 return ktime_get_coarse_with_offset(TK_OFFS_BOOT); 101 } 102 103 /** 104 * ktime_get_clocktai - Returns the TAI time of day in ktime_t format 105 */ 106 static inline ktime_t ktime_get_clocktai(void) 107 { 108 return ktime_get_with_offset(TK_OFFS_TAI); 109 } 110 111 static inline ktime_t ktime_get_coarse_clocktai(void) 112 { 113 return ktime_get_coarse_with_offset(TK_OFFS_TAI); 114 } 115 116 /** 117 * ktime_mono_to_real - Convert monotonic time to clock realtime 118 */ 119 static inline ktime_t ktime_mono_to_real(ktime_t mono) 120 { 121 return ktime_mono_to_any(mono, TK_OFFS_REAL); 122 } 123 124 static inline u64 ktime_get_ns(void) 125 { 126 return ktime_to_ns(ktime_get()); 127 } 128 129 static inline u64 ktime_get_real_ns(void) 130 { 131 return ktime_to_ns(ktime_get_real()); 132 } 133 134 static inline u64 ktime_get_boot_ns(void) 135 { 136 return ktime_to_ns(ktime_get_boottime()); 137 } 138 139 static inline u64 ktime_get_tai_ns(void) 140 { 141 return ktime_to_ns(ktime_get_clocktai()); 142 } 143 144 static inline u64 ktime_get_raw_ns(void) 145 { 146 return ktime_to_ns(ktime_get_raw()); 147 } 148 149 extern u64 ktime_get_mono_fast_ns(void); 150 extern u64 ktime_get_raw_fast_ns(void); 151 extern u64 ktime_get_boot_fast_ns(void); 152 extern u64 ktime_get_real_fast_ns(void); 153 154 /* 155 * timespec64/time64_t interfaces utilizing the ktime based ones 156 * for API completeness, these could be implemented more efficiently 157 * if needed. 158 */ 159 static inline void ktime_get_boottime_ts64(struct timespec64 *ts) 160 { 161 *ts = ktime_to_timespec64(ktime_get_boottime()); 162 } 163 164 static inline void ktime_get_coarse_boottime_ts64(struct timespec64 *ts) 165 { 166 *ts = ktime_to_timespec64(ktime_get_coarse_boottime()); 167 } 168 169 static inline time64_t ktime_get_boottime_seconds(void) 170 { 171 return ktime_divns(ktime_get_coarse_boottime(), NSEC_PER_SEC); 172 } 173 174 static inline void ktime_get_clocktai_ts64(struct timespec64 *ts) 175 { 176 *ts = ktime_to_timespec64(ktime_get_clocktai()); 177 } 178 179 static inline void ktime_get_coarse_clocktai_ts64(struct timespec64 *ts) 180 { 181 *ts = ktime_to_timespec64(ktime_get_coarse_clocktai()); 182 } 183 184 static inline time64_t ktime_get_clocktai_seconds(void) 185 { 186 return ktime_divns(ktime_get_coarse_clocktai(), NSEC_PER_SEC); 187 } 188 189 /* 190 * RTC specific 191 */ 192 extern bool timekeeping_rtc_skipsuspend(void); 193 extern bool timekeeping_rtc_skipresume(void); 194 195 extern void timekeeping_inject_sleeptime64(const struct timespec64 *delta); 196 197 /* 198 * struct system_time_snapshot - simultaneous raw/real time capture with 199 * counter value 200 * @cycles: Clocksource counter value to produce the system times 201 * @real: Realtime system time 202 * @raw: Monotonic raw system time 203 * @clock_was_set_seq: The sequence number of clock was set events 204 * @cs_was_changed_seq: The sequence number of clocksource change events 205 */ 206 struct system_time_snapshot { 207 u64 cycles; 208 ktime_t real; 209 ktime_t raw; 210 unsigned int clock_was_set_seq; 211 u8 cs_was_changed_seq; 212 }; 213 214 /* 215 * struct system_device_crosststamp - system/device cross-timestamp 216 * (syncronized capture) 217 * @device: Device time 218 * @sys_realtime: Realtime simultaneous with device time 219 * @sys_monoraw: Monotonic raw simultaneous with device time 220 */ 221 struct system_device_crosststamp { 222 ktime_t device; 223 ktime_t sys_realtime; 224 ktime_t sys_monoraw; 225 }; 226 227 /* 228 * struct system_counterval_t - system counter value with the pointer to the 229 * corresponding clocksource 230 * @cycles: System counter value 231 * @cs: Clocksource corresponding to system counter value. Used by 232 * timekeeping code to verify comparibility of two cycle values 233 */ 234 struct system_counterval_t { 235 u64 cycles; 236 struct clocksource *cs; 237 }; 238 239 /* 240 * Get cross timestamp between system clock and device clock 241 */ 242 extern int get_device_system_crosststamp( 243 int (*get_time_fn)(ktime_t *device_time, 244 struct system_counterval_t *system_counterval, 245 void *ctx), 246 void *ctx, 247 struct system_time_snapshot *history, 248 struct system_device_crosststamp *xtstamp); 249 250 /* 251 * Simultaneously snapshot realtime and monotonic raw clocks 252 */ 253 extern void ktime_get_snapshot(struct system_time_snapshot *systime_snapshot); 254 255 /* 256 * Persistent clock related interfaces 257 */ 258 extern int persistent_clock_is_local; 259 260 extern void read_persistent_clock64(struct timespec64 *ts); 261 void read_persistent_wall_and_boot_offset(struct timespec64 *wall_clock, 262 struct timespec64 *boot_offset); 263 extern int update_persistent_clock64(struct timespec64 now); 264 265 #endif 266