1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _LINUX_TIMEKEEPING_H 3 #define _LINUX_TIMEKEEPING_H 4 5 #include <linux/errno.h> 6 #include <linux/clocksource_ids.h> 7 8 /* Included from linux/ktime.h */ 9 10 void timekeeping_init(void); 11 extern int timekeeping_suspended; 12 13 /* Architecture timer tick functions: */ 14 extern void legacy_timer_tick(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 */ ktime_get_real(void)77 static inline ktime_t ktime_get_real(void) 78 { 79 return ktime_get_with_offset(TK_OFFS_REAL); 80 } 81 ktime_get_coarse_real(void)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 */ ktime_get_boottime(void)93 static inline ktime_t ktime_get_boottime(void) 94 { 95 return ktime_get_with_offset(TK_OFFS_BOOT); 96 } 97 ktime_get_coarse_boottime(void)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 */ ktime_get_clocktai(void)106 static inline ktime_t ktime_get_clocktai(void) 107 { 108 return ktime_get_with_offset(TK_OFFS_TAI); 109 } 110 ktime_get_coarse_clocktai(void)111 static inline ktime_t ktime_get_coarse_clocktai(void) 112 { 113 return ktime_get_coarse_with_offset(TK_OFFS_TAI); 114 } 115 ktime_get_coarse(void)116 static inline ktime_t ktime_get_coarse(void) 117 { 118 struct timespec64 ts; 119 120 ktime_get_coarse_ts64(&ts); 121 return timespec64_to_ktime(ts); 122 } 123 ktime_get_coarse_ns(void)124 static inline u64 ktime_get_coarse_ns(void) 125 { 126 return ktime_to_ns(ktime_get_coarse()); 127 } 128 ktime_get_coarse_real_ns(void)129 static inline u64 ktime_get_coarse_real_ns(void) 130 { 131 return ktime_to_ns(ktime_get_coarse_real()); 132 } 133 ktime_get_coarse_boottime_ns(void)134 static inline u64 ktime_get_coarse_boottime_ns(void) 135 { 136 return ktime_to_ns(ktime_get_coarse_boottime()); 137 } 138 ktime_get_coarse_clocktai_ns(void)139 static inline u64 ktime_get_coarse_clocktai_ns(void) 140 { 141 return ktime_to_ns(ktime_get_coarse_clocktai()); 142 } 143 144 /** 145 * ktime_mono_to_real - Convert monotonic time to clock realtime 146 */ ktime_mono_to_real(ktime_t mono)147 static inline ktime_t ktime_mono_to_real(ktime_t mono) 148 { 149 return ktime_mono_to_any(mono, TK_OFFS_REAL); 150 } 151 ktime_get_ns(void)152 static inline u64 ktime_get_ns(void) 153 { 154 return ktime_to_ns(ktime_get()); 155 } 156 ktime_get_real_ns(void)157 static inline u64 ktime_get_real_ns(void) 158 { 159 return ktime_to_ns(ktime_get_real()); 160 } 161 ktime_get_boottime_ns(void)162 static inline u64 ktime_get_boottime_ns(void) 163 { 164 return ktime_to_ns(ktime_get_boottime()); 165 } 166 ktime_get_clocktai_ns(void)167 static inline u64 ktime_get_clocktai_ns(void) 168 { 169 return ktime_to_ns(ktime_get_clocktai()); 170 } 171 ktime_get_raw_ns(void)172 static inline u64 ktime_get_raw_ns(void) 173 { 174 return ktime_to_ns(ktime_get_raw()); 175 } 176 177 extern u64 ktime_get_mono_fast_ns(void); 178 extern u64 ktime_get_raw_fast_ns(void); 179 extern u64 ktime_get_boot_fast_ns(void); 180 extern u64 ktime_get_tai_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 */ ktime_get_boottime_ts64(struct timespec64 * ts)188 static inline void ktime_get_boottime_ts64(struct timespec64 *ts) 189 { 190 *ts = ktime_to_timespec64(ktime_get_boottime()); 191 } 192 ktime_get_coarse_boottime_ts64(struct timespec64 * ts)193 static inline void ktime_get_coarse_boottime_ts64(struct timespec64 *ts) 194 { 195 *ts = ktime_to_timespec64(ktime_get_coarse_boottime()); 196 } 197 ktime_get_boottime_seconds(void)198 static inline time64_t ktime_get_boottime_seconds(void) 199 { 200 return ktime_divns(ktime_get_coarse_boottime(), NSEC_PER_SEC); 201 } 202 ktime_get_clocktai_ts64(struct timespec64 * ts)203 static inline void ktime_get_clocktai_ts64(struct timespec64 *ts) 204 { 205 *ts = ktime_to_timespec64(ktime_get_clocktai()); 206 } 207 ktime_get_coarse_clocktai_ts64(struct timespec64 * ts)208 static inline void ktime_get_coarse_clocktai_ts64(struct timespec64 *ts) 209 { 210 *ts = ktime_to_timespec64(ktime_get_coarse_clocktai()); 211 } 212 ktime_get_clocktai_seconds(void)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 enum clocksource_ids cs_id; 252 unsigned int clock_was_set_seq; 253 u8 cs_was_changed_seq; 254 }; 255 256 /** 257 * struct system_device_crosststamp - system/device cross-timestamp 258 * (synchronized capture) 259 * @device: Device time 260 * @sys_realtime: Realtime simultaneous with device time 261 * @sys_monoraw: Monotonic raw simultaneous with device time 262 */ 263 struct system_device_crosststamp { 264 ktime_t device; 265 ktime_t sys_realtime; 266 ktime_t sys_monoraw; 267 }; 268 269 /** 270 * struct system_counterval_t - system counter value with the pointer to the 271 * corresponding clocksource 272 * @cycles: System counter value 273 * @cs: Clocksource corresponding to system counter value. Used by 274 * timekeeping code to verify comparibility of two cycle values 275 */ 276 struct system_counterval_t { 277 u64 cycles; 278 struct clocksource *cs; 279 }; 280 281 /* 282 * Get cross timestamp between system clock and device clock 283 */ 284 extern int get_device_system_crosststamp( 285 int (*get_time_fn)(ktime_t *device_time, 286 struct system_counterval_t *system_counterval, 287 void *ctx), 288 void *ctx, 289 struct system_time_snapshot *history, 290 struct system_device_crosststamp *xtstamp); 291 292 /* 293 * Simultaneously snapshot realtime and monotonic raw clocks 294 */ 295 extern void ktime_get_snapshot(struct system_time_snapshot *systime_snapshot); 296 297 /* NMI safe mono/boot/realtime timestamps */ 298 extern void ktime_get_fast_timestamps(struct ktime_timestamps *snap); 299 300 /* 301 * Persistent clock related interfaces 302 */ 303 extern int persistent_clock_is_local; 304 305 extern void read_persistent_clock64(struct timespec64 *ts); 306 void read_persistent_wall_and_boot_offset(struct timespec64 *wall_clock, 307 struct timespec64 *boot_offset); 308 #ifdef CONFIG_GENERIC_CMOS_UPDATE 309 extern int update_persistent_clock64(struct timespec64 now); 310 #endif 311 312 #endif 313