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 extern void legacy_timer_tick(unsigned long ticks); 16 17 /* 18 * Get and set timeofday 19 */ 20 extern int do_settimeofday64(const struct timespec64 *ts); 21 extern int do_sys_settimeofday64(const struct timespec64 *tv, 22 const struct timezone *tz); 23 24 /* 25 * ktime_get() family: read the current time in a multitude of ways, 26 * 27 * The default time reference is CLOCK_MONOTONIC, starting at 28 * boot time but not counting the time spent in suspend. 29 * For other references, use the functions with "real", "clocktai", 30 * "boottime" and "raw" suffixes. 31 * 32 * To get the time in a different format, use the ones wit 33 * "ns", "ts64" and "seconds" suffix. 34 * 35 * See Documentation/core-api/timekeeping.rst for more details. 36 */ 37 38 39 /* 40 * timespec64 based interfaces 41 */ 42 extern void ktime_get_raw_ts64(struct timespec64 *ts); 43 extern void ktime_get_ts64(struct timespec64 *ts); 44 extern void ktime_get_real_ts64(struct timespec64 *tv); 45 extern void ktime_get_coarse_ts64(struct timespec64 *ts); 46 extern void ktime_get_coarse_real_ts64(struct timespec64 *ts); 47 48 void getboottime64(struct timespec64 *ts); 49 50 /* 51 * time64_t base interfaces 52 */ 53 extern time64_t ktime_get_seconds(void); 54 extern time64_t __ktime_get_real_seconds(void); 55 extern time64_t ktime_get_real_seconds(void); 56 57 /* 58 * ktime_t based interfaces 59 */ 60 61 enum tk_offsets { 62 TK_OFFS_REAL, 63 TK_OFFS_BOOT, 64 TK_OFFS_TAI, 65 TK_OFFS_MAX, 66 }; 67 68 extern ktime_t ktime_get(void); 69 extern ktime_t ktime_get_with_offset(enum tk_offsets offs); 70 extern ktime_t ktime_get_coarse_with_offset(enum tk_offsets offs); 71 extern ktime_t ktime_mono_to_any(ktime_t tmono, enum tk_offsets offs); 72 extern ktime_t ktime_get_raw(void); 73 extern u32 ktime_get_resolution_ns(void); 74 75 /** 76 * ktime_get_real - get the real (wall-) time in ktime_t format 77 */ 78 static inline ktime_t ktime_get_real(void) 79 { 80 return ktime_get_with_offset(TK_OFFS_REAL); 81 } 82 83 static inline ktime_t ktime_get_coarse_real(void) 84 { 85 return ktime_get_coarse_with_offset(TK_OFFS_REAL); 86 } 87 88 /** 89 * ktime_get_boottime - Returns monotonic time since boot in ktime_t format 90 * 91 * This is similar to CLOCK_MONTONIC/ktime_get, but also includes the 92 * time spent in suspend. 93 */ 94 static inline ktime_t ktime_get_boottime(void) 95 { 96 return ktime_get_with_offset(TK_OFFS_BOOT); 97 } 98 99 static inline ktime_t ktime_get_coarse_boottime(void) 100 { 101 return ktime_get_coarse_with_offset(TK_OFFS_BOOT); 102 } 103 104 /** 105 * ktime_get_clocktai - Returns the TAI time of day in ktime_t format 106 */ 107 static inline ktime_t ktime_get_clocktai(void) 108 { 109 return ktime_get_with_offset(TK_OFFS_TAI); 110 } 111 112 static inline ktime_t ktime_get_coarse_clocktai(void) 113 { 114 return ktime_get_coarse_with_offset(TK_OFFS_TAI); 115 } 116 117 static inline ktime_t ktime_get_coarse(void) 118 { 119 struct timespec64 ts; 120 121 ktime_get_coarse_ts64(&ts); 122 return timespec64_to_ktime(ts); 123 } 124 125 static inline u64 ktime_get_coarse_ns(void) 126 { 127 return ktime_to_ns(ktime_get_coarse()); 128 } 129 130 static inline u64 ktime_get_coarse_real_ns(void) 131 { 132 return ktime_to_ns(ktime_get_coarse_real()); 133 } 134 135 static inline u64 ktime_get_coarse_boottime_ns(void) 136 { 137 return ktime_to_ns(ktime_get_coarse_boottime()); 138 } 139 140 static inline u64 ktime_get_coarse_clocktai_ns(void) 141 { 142 return ktime_to_ns(ktime_get_coarse_clocktai()); 143 } 144 145 /** 146 * ktime_mono_to_real - Convert monotonic time to clock realtime 147 */ 148 static inline ktime_t ktime_mono_to_real(ktime_t mono) 149 { 150 return ktime_mono_to_any(mono, TK_OFFS_REAL); 151 } 152 153 static inline u64 ktime_get_ns(void) 154 { 155 return ktime_to_ns(ktime_get()); 156 } 157 158 static inline u64 ktime_get_real_ns(void) 159 { 160 return ktime_to_ns(ktime_get_real()); 161 } 162 163 static inline u64 ktime_get_boottime_ns(void) 164 { 165 return ktime_to_ns(ktime_get_boottime()); 166 } 167 168 static inline u64 ktime_get_clocktai_ns(void) 169 { 170 return ktime_to_ns(ktime_get_clocktai()); 171 } 172 173 static inline u64 ktime_get_raw_ns(void) 174 { 175 return ktime_to_ns(ktime_get_raw()); 176 } 177 178 extern u64 ktime_get_mono_fast_ns(void); 179 extern u64 ktime_get_raw_fast_ns(void); 180 extern u64 ktime_get_boot_fast_ns(void); 181 extern u64 ktime_get_real_fast_ns(void); 182 183 /* 184 * timespec64/time64_t interfaces utilizing the ktime based ones 185 * for API completeness, these could be implemented more efficiently 186 * if needed. 187 */ 188 static inline void ktime_get_boottime_ts64(struct timespec64 *ts) 189 { 190 *ts = ktime_to_timespec64(ktime_get_boottime()); 191 } 192 193 static inline void ktime_get_coarse_boottime_ts64(struct timespec64 *ts) 194 { 195 *ts = ktime_to_timespec64(ktime_get_coarse_boottime()); 196 } 197 198 static inline time64_t ktime_get_boottime_seconds(void) 199 { 200 return ktime_divns(ktime_get_coarse_boottime(), NSEC_PER_SEC); 201 } 202 203 static inline void ktime_get_clocktai_ts64(struct timespec64 *ts) 204 { 205 *ts = ktime_to_timespec64(ktime_get_clocktai()); 206 } 207 208 static inline void ktime_get_coarse_clocktai_ts64(struct timespec64 *ts) 209 { 210 *ts = ktime_to_timespec64(ktime_get_coarse_clocktai()); 211 } 212 213 static inline time64_t ktime_get_clocktai_seconds(void) 214 { 215 return ktime_divns(ktime_get_coarse_clocktai(), NSEC_PER_SEC); 216 } 217 218 /* 219 * RTC specific 220 */ 221 extern bool timekeeping_rtc_skipsuspend(void); 222 extern bool timekeeping_rtc_skipresume(void); 223 224 extern void timekeeping_inject_sleeptime64(const struct timespec64 *delta); 225 226 /* 227 * struct ktime_timestanps - Simultaneous mono/boot/real timestamps 228 * @mono: Monotonic timestamp 229 * @boot: Boottime timestamp 230 * @real: Realtime timestamp 231 */ 232 struct ktime_timestamps { 233 u64 mono; 234 u64 boot; 235 u64 real; 236 }; 237 238 /** 239 * struct system_time_snapshot - simultaneous raw/real time capture with 240 * counter value 241 * @cycles: Clocksource counter value to produce the system times 242 * @real: Realtime system time 243 * @raw: Monotonic raw system time 244 * @clock_was_set_seq: The sequence number of clock was set events 245 * @cs_was_changed_seq: The sequence number of clocksource change events 246 */ 247 struct system_time_snapshot { 248 u64 cycles; 249 ktime_t real; 250 ktime_t raw; 251 unsigned int clock_was_set_seq; 252 u8 cs_was_changed_seq; 253 }; 254 255 /** 256 * struct system_device_crosststamp - system/device cross-timestamp 257 * (synchronized capture) 258 * @device: Device time 259 * @sys_realtime: Realtime simultaneous with device time 260 * @sys_monoraw: Monotonic raw simultaneous with device time 261 */ 262 struct system_device_crosststamp { 263 ktime_t device; 264 ktime_t sys_realtime; 265 ktime_t sys_monoraw; 266 }; 267 268 /** 269 * struct system_counterval_t - system counter value with the pointer to the 270 * corresponding clocksource 271 * @cycles: System counter value 272 * @cs: Clocksource corresponding to system counter value. Used by 273 * timekeeping code to verify comparibility of two cycle values 274 */ 275 struct system_counterval_t { 276 u64 cycles; 277 struct clocksource *cs; 278 }; 279 280 /* 281 * Get cross timestamp between system clock and device clock 282 */ 283 extern int get_device_system_crosststamp( 284 int (*get_time_fn)(ktime_t *device_time, 285 struct system_counterval_t *system_counterval, 286 void *ctx), 287 void *ctx, 288 struct system_time_snapshot *history, 289 struct system_device_crosststamp *xtstamp); 290 291 /* 292 * Simultaneously snapshot realtime and monotonic raw clocks 293 */ 294 extern void ktime_get_snapshot(struct system_time_snapshot *systime_snapshot); 295 296 /* NMI safe mono/boot/realtime timestamps */ 297 extern void ktime_get_fast_timestamps(struct ktime_timestamps *snap); 298 299 /* 300 * Persistent clock related interfaces 301 */ 302 extern int persistent_clock_is_local; 303 304 extern void read_persistent_clock64(struct timespec64 *ts); 305 void read_persistent_wall_and_boot_offset(struct timespec64 *wall_clock, 306 struct timespec64 *boot_offset); 307 extern int update_persistent_clock64(struct timespec64 now); 308 309 #endif 310