1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _LINUX_TIMEKEEPING_H
3 #define _LINUX_TIMEKEEPING_H
5 #include <linux/errno.h>
7 /* Included from linux/ktime.h */
9 void timekeeping_init(void);
10 extern int timekeeping_suspended;
12 /* Architecture timer tick functions: */
13 extern void update_process_times(int user);
14 extern void xtime_update(unsigned long ticks);
17 * Get and set timeofday
19 extern int do_settimeofday64(const struct timespec64 *ts);
20 extern int do_sys_settimeofday64(const struct timespec64 *tv,
21 const struct timezone *tz);
23 * Kernel time accessors
25 struct timespec64 current_kernel_time64(void);
28 * timespec64 based interfaces
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 extern void ktime_get_active_ts64(struct timespec64 *ts);
37 extern int __getnstimeofday64(struct timespec64 *tv);
38 extern void getnstimeofday64(struct timespec64 *tv);
39 extern void getboottime64(struct timespec64 *ts);
41 #define ktime_get_real_ts64(ts) getnstimeofday64(ts)
43 /* Clock BOOTTIME compatibility wrappers */
44 static inline void get_monotonic_boottime64(struct timespec64 *ts)
50 * ktime_t based interfaces
58 extern ktime_t ktime_get(void);
59 extern ktime_t ktime_get_with_offset(enum tk_offsets offs);
60 extern ktime_t ktime_mono_to_any(ktime_t tmono, enum tk_offsets offs);
61 extern ktime_t ktime_get_raw(void);
62 extern u32 ktime_get_resolution_ns(void);
64 /* Clock BOOTTIME compatibility wrappers */
65 static inline ktime_t ktime_get_boottime(void) { return ktime_get(); }
66 static inline u64 ktime_get_boot_ns(void) { return ktime_get(); }
69 * ktime_get_real - get the real (wall-) time in ktime_t format
71 static inline ktime_t ktime_get_real(void)
73 return ktime_get_with_offset(TK_OFFS_REAL);
77 * ktime_get_clocktai - Returns the TAI time of day in ktime_t format
79 static inline ktime_t ktime_get_clocktai(void)
81 return ktime_get_with_offset(TK_OFFS_TAI);
85 * ktime_mono_to_real - Convert monotonic time to clock realtime
87 static inline ktime_t ktime_mono_to_real(ktime_t mono)
89 return ktime_mono_to_any(mono, TK_OFFS_REAL);
92 static inline u64 ktime_get_ns(void)
94 return ktime_to_ns(ktime_get());
97 static inline u64 ktime_get_real_ns(void)
99 return ktime_to_ns(ktime_get_real());
102 static inline u64 ktime_get_tai_ns(void)
104 return ktime_to_ns(ktime_get_clocktai());
107 static inline u64 ktime_get_raw_ns(void)
109 return ktime_to_ns(ktime_get_raw());
112 extern u64 ktime_get_mono_fast_ns(void);
113 extern u64 ktime_get_raw_fast_ns(void);
114 extern u64 ktime_get_real_fast_ns(void);
117 * timespec64 interfaces utilizing the ktime based ones
119 static inline void timekeeping_clocktai64(struct timespec64 *ts)
121 *ts = ktime_to_timespec64(ktime_get_clocktai());
127 extern bool timekeeping_rtc_skipsuspend(void);
128 extern bool timekeeping_rtc_skipresume(void);
130 extern void timekeeping_inject_sleeptime64(struct timespec64 *delta);
133 * struct system_time_snapshot - simultaneous raw/real time capture with
135 * @cycles: Clocksource counter value to produce the system times
136 * @real: Realtime system time
137 * @raw: Monotonic raw system time
138 * @clock_was_set_seq: The sequence number of clock was set events
139 * @cs_was_changed_seq: The sequence number of clocksource change events
141 struct system_time_snapshot {
145 unsigned int clock_was_set_seq;
146 u8 cs_was_changed_seq;
150 * struct system_device_crosststamp - system/device cross-timestamp
151 * (syncronized capture)
152 * @device: Device time
153 * @sys_realtime: Realtime simultaneous with device time
154 * @sys_monoraw: Monotonic raw simultaneous with device time
156 struct system_device_crosststamp {
158 ktime_t sys_realtime;
163 * struct system_counterval_t - system counter value with the pointer to the
164 * corresponding clocksource
165 * @cycles: System counter value
166 * @cs: Clocksource corresponding to system counter value. Used by
167 * timekeeping code to verify comparibility of two cycle values
169 struct system_counterval_t {
171 struct clocksource *cs;
175 * Get cross timestamp between system clock and device clock
177 extern int get_device_system_crosststamp(
178 int (*get_time_fn)(ktime_t *device_time,
179 struct system_counterval_t *system_counterval,
182 struct system_time_snapshot *history,
183 struct system_device_crosststamp *xtstamp);
186 * Simultaneously snapshot realtime and monotonic raw clocks
188 extern void ktime_get_snapshot(struct system_time_snapshot *systime_snapshot);
191 * Persistent clock related interfaces
193 extern int persistent_clock_is_local;
195 extern void read_persistent_clock64(struct timespec64 *ts);
196 extern void read_boot_clock64(struct timespec64 *ts);
197 extern int update_persistent_clock64(struct timespec64 now);