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  */
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 
116 /**
117  * ktime_mono_to_real - Convert monotonic time to clock realtime
118  */
ktime_mono_to_real(ktime_t mono)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 
ktime_get_ns(void)124 static inline u64 ktime_get_ns(void)
125 {
126 	return ktime_to_ns(ktime_get());
127 }
128 
ktime_get_real_ns(void)129 static inline u64 ktime_get_real_ns(void)
130 {
131 	return ktime_to_ns(ktime_get_real());
132 }
133 
ktime_get_boot_ns(void)134 static inline u64 ktime_get_boot_ns(void)
135 {
136 	return ktime_to_ns(ktime_get_boottime());
137 }
138 
ktime_get_tai_ns(void)139 static inline u64 ktime_get_tai_ns(void)
140 {
141 	return ktime_to_ns(ktime_get_clocktai());
142 }
143 
ktime_get_raw_ns(void)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  */
ktime_get_boottime_ts64(struct timespec64 * ts)159 static inline void ktime_get_boottime_ts64(struct timespec64 *ts)
160 {
161 	*ts = ktime_to_timespec64(ktime_get_boottime());
162 }
163 
ktime_get_coarse_boottime_ts64(struct timespec64 * ts)164 static inline void ktime_get_coarse_boottime_ts64(struct timespec64 *ts)
165 {
166 	*ts = ktime_to_timespec64(ktime_get_coarse_boottime());
167 }
168 
ktime_get_boottime_seconds(void)169 static inline time64_t ktime_get_boottime_seconds(void)
170 {
171 	return ktime_divns(ktime_get_coarse_boottime(), NSEC_PER_SEC);
172 }
173 
ktime_get_clocktai_ts64(struct timespec64 * ts)174 static inline void ktime_get_clocktai_ts64(struct timespec64 *ts)
175 {
176 	*ts = ktime_to_timespec64(ktime_get_clocktai());
177 }
178 
ktime_get_coarse_clocktai_ts64(struct timespec64 * ts)179 static inline void ktime_get_coarse_clocktai_ts64(struct timespec64 *ts)
180 {
181 	*ts = ktime_to_timespec64(ktime_get_coarse_clocktai());
182 }
183 
ktime_get_clocktai_seconds(void)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 /*
266  * deprecated aliases, don't use in new code
267  */
268 #define getnstimeofday64(ts)		ktime_get_real_ts64(ts)
269 #define get_monotonic_boottime64(ts)	ktime_get_boottime_ts64(ts)
270 #define getrawmonotonic64(ts)		ktime_get_raw_ts64(ts)
271 #define timekeeping_clocktai64(ts)	ktime_get_clocktai_ts64(ts)
272 
current_kernel_time64(void)273 static inline struct timespec64 current_kernel_time64(void)
274 {
275 	struct timespec64 ts;
276 
277 	ktime_get_coarse_real_ts64(&ts);
278 
279 	return ts;
280 }
281 
get_monotonic_coarse64(void)282 static inline struct timespec64 get_monotonic_coarse64(void)
283 {
284 	struct timespec64 ts;
285 
286 	ktime_get_coarse_ts64(&ts);
287 
288 	return ts;
289 }
290 
291 #endif
292