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Commit | Line | Data |
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8524070b JS |
1 | /* |
2 | * linux/kernel/time/timekeeping.c | |
3 | * | |
4 | * Kernel timekeeping code and accessor functions | |
5 | * | |
6 | * This code was moved from linux/kernel/timer.c. | |
7 | * Please see that file for copyright and history logs. | |
8 | * | |
9 | */ | |
10 | ||
d7b4202e | 11 | #include <linux/timekeeper_internal.h> |
8524070b JS |
12 | #include <linux/module.h> |
13 | #include <linux/interrupt.h> | |
14 | #include <linux/percpu.h> | |
15 | #include <linux/init.h> | |
16 | #include <linux/mm.h> | |
d43c36dc | 17 | #include <linux/sched.h> |
e1a85b2c | 18 | #include <linux/syscore_ops.h> |
8524070b JS |
19 | #include <linux/clocksource.h> |
20 | #include <linux/jiffies.h> | |
21 | #include <linux/time.h> | |
22 | #include <linux/tick.h> | |
75c5158f | 23 | #include <linux/stop_machine.h> |
e0b306fe | 24 | #include <linux/pvclock_gtod.h> |
8524070b | 25 | |
eb93e4d9 | 26 | #include "tick-internal.h" |
155ec602 | 27 | |
afa14e7c | 28 | static struct timekeeper timekeeper; |
9a7a71b1 TG |
29 | static DEFINE_RAW_SPINLOCK(timekeeper_lock); |
30 | static seqcount_t timekeeper_seq; | |
155ec602 | 31 | |
8fcce546 JS |
32 | /* flag for if timekeeping is suspended */ |
33 | int __read_mostly timekeeping_suspended; | |
34 | ||
31ade306 FT |
35 | /* Flag for if there is a persistent clock on this platform */ |
36 | bool __read_mostly persistent_clock_exist = false; | |
37 | ||
1e75fa8b JS |
38 | static inline void tk_normalize_xtime(struct timekeeper *tk) |
39 | { | |
40 | while (tk->xtime_nsec >= ((u64)NSEC_PER_SEC << tk->shift)) { | |
41 | tk->xtime_nsec -= (u64)NSEC_PER_SEC << tk->shift; | |
42 | tk->xtime_sec++; | |
43 | } | |
44 | } | |
45 | ||
1e75fa8b JS |
46 | static void tk_set_xtime(struct timekeeper *tk, const struct timespec *ts) |
47 | { | |
48 | tk->xtime_sec = ts->tv_sec; | |
b44d50dc | 49 | tk->xtime_nsec = (u64)ts->tv_nsec << tk->shift; |
1e75fa8b JS |
50 | } |
51 | ||
52 | static void tk_xtime_add(struct timekeeper *tk, const struct timespec *ts) | |
53 | { | |
54 | tk->xtime_sec += ts->tv_sec; | |
b44d50dc | 55 | tk->xtime_nsec += (u64)ts->tv_nsec << tk->shift; |
784ffcbb | 56 | tk_normalize_xtime(tk); |
1e75fa8b | 57 | } |
8fcce546 | 58 | |
6d0ef903 JS |
59 | static void tk_set_wall_to_mono(struct timekeeper *tk, struct timespec wtm) |
60 | { | |
61 | struct timespec tmp; | |
62 | ||
63 | /* | |
64 | * Verify consistency of: offset_real = -wall_to_monotonic | |
65 | * before modifying anything | |
66 | */ | |
67 | set_normalized_timespec(&tmp, -tk->wall_to_monotonic.tv_sec, | |
68 | -tk->wall_to_monotonic.tv_nsec); | |
69 | WARN_ON_ONCE(tk->offs_real.tv64 != timespec_to_ktime(tmp).tv64); | |
70 | tk->wall_to_monotonic = wtm; | |
71 | set_normalized_timespec(&tmp, -wtm.tv_sec, -wtm.tv_nsec); | |
72 | tk->offs_real = timespec_to_ktime(tmp); | |
90adda98 | 73 | tk->offs_tai = ktime_sub(tk->offs_real, ktime_set(tk->tai_offset, 0)); |
6d0ef903 JS |
74 | } |
75 | ||
76 | static void tk_set_sleep_time(struct timekeeper *tk, struct timespec t) | |
77 | { | |
78 | /* Verify consistency before modifying */ | |
79 | WARN_ON_ONCE(tk->offs_boot.tv64 != timespec_to_ktime(tk->total_sleep_time).tv64); | |
80 | ||
81 | tk->total_sleep_time = t; | |
82 | tk->offs_boot = timespec_to_ktime(t); | |
83 | } | |
84 | ||
155ec602 MS |
85 | /** |
86 | * timekeeper_setup_internals - Set up internals to use clocksource clock. | |
87 | * | |
88 | * @clock: Pointer to clocksource. | |
89 | * | |
90 | * Calculates a fixed cycle/nsec interval for a given clocksource/adjustment | |
91 | * pair and interval request. | |
92 | * | |
93 | * Unless you're the timekeeping code, you should not be using this! | |
94 | */ | |
f726a697 | 95 | static void tk_setup_internals(struct timekeeper *tk, struct clocksource *clock) |
155ec602 MS |
96 | { |
97 | cycle_t interval; | |
a386b5af | 98 | u64 tmp, ntpinterval; |
1e75fa8b | 99 | struct clocksource *old_clock; |
155ec602 | 100 | |
f726a697 JS |
101 | old_clock = tk->clock; |
102 | tk->clock = clock; | |
155ec602 MS |
103 | clock->cycle_last = clock->read(clock); |
104 | ||
105 | /* Do the ns -> cycle conversion first, using original mult */ | |
106 | tmp = NTP_INTERVAL_LENGTH; | |
107 | tmp <<= clock->shift; | |
a386b5af | 108 | ntpinterval = tmp; |
0a544198 MS |
109 | tmp += clock->mult/2; |
110 | do_div(tmp, clock->mult); | |
155ec602 MS |
111 | if (tmp == 0) |
112 | tmp = 1; | |
113 | ||
114 | interval = (cycle_t) tmp; | |
f726a697 | 115 | tk->cycle_interval = interval; |
155ec602 MS |
116 | |
117 | /* Go back from cycles -> shifted ns */ | |
f726a697 JS |
118 | tk->xtime_interval = (u64) interval * clock->mult; |
119 | tk->xtime_remainder = ntpinterval - tk->xtime_interval; | |
120 | tk->raw_interval = | |
0a544198 | 121 | ((u64) interval * clock->mult) >> clock->shift; |
155ec602 | 122 | |
1e75fa8b JS |
123 | /* if changing clocks, convert xtime_nsec shift units */ |
124 | if (old_clock) { | |
125 | int shift_change = clock->shift - old_clock->shift; | |
126 | if (shift_change < 0) | |
f726a697 | 127 | tk->xtime_nsec >>= -shift_change; |
1e75fa8b | 128 | else |
f726a697 | 129 | tk->xtime_nsec <<= shift_change; |
1e75fa8b | 130 | } |
f726a697 | 131 | tk->shift = clock->shift; |
155ec602 | 132 | |
f726a697 JS |
133 | tk->ntp_error = 0; |
134 | tk->ntp_error_shift = NTP_SCALE_SHIFT - clock->shift; | |
0a544198 MS |
135 | |
136 | /* | |
137 | * The timekeeper keeps its own mult values for the currently | |
138 | * active clocksource. These value will be adjusted via NTP | |
139 | * to counteract clock drifting. | |
140 | */ | |
f726a697 | 141 | tk->mult = clock->mult; |
155ec602 | 142 | } |
8524070b | 143 | |
2ba2a305 | 144 | /* Timekeeper helper functions. */ |
7b1f6207 SW |
145 | |
146 | #ifdef CONFIG_ARCH_USES_GETTIMEOFFSET | |
147 | u32 (*arch_gettimeoffset)(void); | |
148 | ||
149 | u32 get_arch_timeoffset(void) | |
150 | { | |
151 | if (likely(arch_gettimeoffset)) | |
152 | return arch_gettimeoffset(); | |
153 | return 0; | |
154 | } | |
155 | #else | |
156 | static inline u32 get_arch_timeoffset(void) { return 0; } | |
157 | #endif | |
158 | ||
f726a697 | 159 | static inline s64 timekeeping_get_ns(struct timekeeper *tk) |
2ba2a305 MS |
160 | { |
161 | cycle_t cycle_now, cycle_delta; | |
162 | struct clocksource *clock; | |
1e75fa8b | 163 | s64 nsec; |
2ba2a305 MS |
164 | |
165 | /* read clocksource: */ | |
f726a697 | 166 | clock = tk->clock; |
2ba2a305 MS |
167 | cycle_now = clock->read(clock); |
168 | ||
169 | /* calculate the delta since the last update_wall_time: */ | |
170 | cycle_delta = (cycle_now - clock->cycle_last) & clock->mask; | |
171 | ||
f726a697 JS |
172 | nsec = cycle_delta * tk->mult + tk->xtime_nsec; |
173 | nsec >>= tk->shift; | |
f2a5a085 | 174 | |
7b1f6207 SW |
175 | /* If arch requires, add in get_arch_timeoffset() */ |
176 | return nsec + get_arch_timeoffset(); | |
2ba2a305 MS |
177 | } |
178 | ||
f726a697 | 179 | static inline s64 timekeeping_get_ns_raw(struct timekeeper *tk) |
2ba2a305 MS |
180 | { |
181 | cycle_t cycle_now, cycle_delta; | |
182 | struct clocksource *clock; | |
f2a5a085 | 183 | s64 nsec; |
2ba2a305 MS |
184 | |
185 | /* read clocksource: */ | |
f726a697 | 186 | clock = tk->clock; |
2ba2a305 MS |
187 | cycle_now = clock->read(clock); |
188 | ||
189 | /* calculate the delta since the last update_wall_time: */ | |
190 | cycle_delta = (cycle_now - clock->cycle_last) & clock->mask; | |
191 | ||
f2a5a085 JS |
192 | /* convert delta to nanoseconds. */ |
193 | nsec = clocksource_cyc2ns(cycle_delta, clock->mult, clock->shift); | |
194 | ||
7b1f6207 SW |
195 | /* If arch requires, add in get_arch_timeoffset() */ |
196 | return nsec + get_arch_timeoffset(); | |
2ba2a305 MS |
197 | } |
198 | ||
e0b306fe MT |
199 | static RAW_NOTIFIER_HEAD(pvclock_gtod_chain); |
200 | ||
201 | static void update_pvclock_gtod(struct timekeeper *tk) | |
202 | { | |
203 | raw_notifier_call_chain(&pvclock_gtod_chain, 0, tk); | |
204 | } | |
205 | ||
206 | /** | |
207 | * pvclock_gtod_register_notifier - register a pvclock timedata update listener | |
e0b306fe MT |
208 | */ |
209 | int pvclock_gtod_register_notifier(struct notifier_block *nb) | |
210 | { | |
211 | struct timekeeper *tk = &timekeeper; | |
212 | unsigned long flags; | |
213 | int ret; | |
214 | ||
9a7a71b1 | 215 | raw_spin_lock_irqsave(&timekeeper_lock, flags); |
e0b306fe | 216 | ret = raw_notifier_chain_register(&pvclock_gtod_chain, nb); |
e0b306fe | 217 | update_pvclock_gtod(tk); |
9a7a71b1 | 218 | raw_spin_unlock_irqrestore(&timekeeper_lock, flags); |
e0b306fe MT |
219 | |
220 | return ret; | |
221 | } | |
222 | EXPORT_SYMBOL_GPL(pvclock_gtod_register_notifier); | |
223 | ||
224 | /** | |
225 | * pvclock_gtod_unregister_notifier - unregister a pvclock | |
226 | * timedata update listener | |
e0b306fe MT |
227 | */ |
228 | int pvclock_gtod_unregister_notifier(struct notifier_block *nb) | |
229 | { | |
e0b306fe MT |
230 | unsigned long flags; |
231 | int ret; | |
232 | ||
9a7a71b1 | 233 | raw_spin_lock_irqsave(&timekeeper_lock, flags); |
e0b306fe | 234 | ret = raw_notifier_chain_unregister(&pvclock_gtod_chain, nb); |
9a7a71b1 | 235 | raw_spin_unlock_irqrestore(&timekeeper_lock, flags); |
e0b306fe MT |
236 | |
237 | return ret; | |
238 | } | |
239 | EXPORT_SYMBOL_GPL(pvclock_gtod_unregister_notifier); | |
240 | ||
9a7a71b1 | 241 | /* must hold timekeeper_lock */ |
f726a697 | 242 | static void timekeeping_update(struct timekeeper *tk, bool clearntp) |
cc06268c TG |
243 | { |
244 | if (clearntp) { | |
f726a697 | 245 | tk->ntp_error = 0; |
cc06268c TG |
246 | ntp_clear(); |
247 | } | |
576094b7 | 248 | update_vsyscall(tk); |
e0b306fe | 249 | update_pvclock_gtod(tk); |
cc06268c TG |
250 | } |
251 | ||
8524070b | 252 | /** |
155ec602 | 253 | * timekeeping_forward_now - update clock to the current time |
8524070b | 254 | * |
9a055117 RZ |
255 | * Forward the current clock to update its state since the last call to |
256 | * update_wall_time(). This is useful before significant clock changes, | |
257 | * as it avoids having to deal with this time offset explicitly. | |
8524070b | 258 | */ |
f726a697 | 259 | static void timekeeping_forward_now(struct timekeeper *tk) |
8524070b JS |
260 | { |
261 | cycle_t cycle_now, cycle_delta; | |
155ec602 | 262 | struct clocksource *clock; |
9a055117 | 263 | s64 nsec; |
8524070b | 264 | |
f726a697 | 265 | clock = tk->clock; |
a0f7d48b | 266 | cycle_now = clock->read(clock); |
8524070b | 267 | cycle_delta = (cycle_now - clock->cycle_last) & clock->mask; |
9a055117 | 268 | clock->cycle_last = cycle_now; |
8524070b | 269 | |
f726a697 | 270 | tk->xtime_nsec += cycle_delta * tk->mult; |
7d27558c | 271 | |
7b1f6207 SW |
272 | /* If arch requires, add in get_arch_timeoffset() */ |
273 | tk->xtime_nsec += (u64)get_arch_timeoffset() << tk->shift; | |
7d27558c | 274 | |
f726a697 | 275 | tk_normalize_xtime(tk); |
2d42244a | 276 | |
0a544198 | 277 | nsec = clocksource_cyc2ns(cycle_delta, clock->mult, clock->shift); |
f726a697 | 278 | timespec_add_ns(&tk->raw_time, nsec); |
8524070b JS |
279 | } |
280 | ||
281 | /** | |
1e817fb6 | 282 | * __getnstimeofday - Returns the time of day in a timespec. |
8524070b JS |
283 | * @ts: pointer to the timespec to be set |
284 | * | |
1e817fb6 KC |
285 | * Updates the time of day in the timespec. |
286 | * Returns 0 on success, or -ve when suspended (timespec will be undefined). | |
8524070b | 287 | */ |
1e817fb6 | 288 | int __getnstimeofday(struct timespec *ts) |
8524070b | 289 | { |
4e250fdd | 290 | struct timekeeper *tk = &timekeeper; |
8524070b | 291 | unsigned long seq; |
1e75fa8b | 292 | s64 nsecs = 0; |
8524070b JS |
293 | |
294 | do { | |
9a7a71b1 | 295 | seq = read_seqcount_begin(&timekeeper_seq); |
8524070b | 296 | |
4e250fdd | 297 | ts->tv_sec = tk->xtime_sec; |
ec145bab | 298 | nsecs = timekeeping_get_ns(tk); |
8524070b | 299 | |
9a7a71b1 | 300 | } while (read_seqcount_retry(&timekeeper_seq, seq)); |
8524070b | 301 | |
ec145bab | 302 | ts->tv_nsec = 0; |
8524070b | 303 | timespec_add_ns(ts, nsecs); |
1e817fb6 KC |
304 | |
305 | /* | |
306 | * Do not bail out early, in case there were callers still using | |
307 | * the value, even in the face of the WARN_ON. | |
308 | */ | |
309 | if (unlikely(timekeeping_suspended)) | |
310 | return -EAGAIN; | |
311 | return 0; | |
312 | } | |
313 | EXPORT_SYMBOL(__getnstimeofday); | |
314 | ||
315 | /** | |
316 | * getnstimeofday - Returns the time of day in a timespec. | |
317 | * @ts: pointer to the timespec to be set | |
318 | * | |
319 | * Returns the time of day in a timespec (WARN if suspended). | |
320 | */ | |
321 | void getnstimeofday(struct timespec *ts) | |
322 | { | |
323 | WARN_ON(__getnstimeofday(ts)); | |
8524070b | 324 | } |
8524070b JS |
325 | EXPORT_SYMBOL(getnstimeofday); |
326 | ||
951ed4d3 MS |
327 | ktime_t ktime_get(void) |
328 | { | |
4e250fdd | 329 | struct timekeeper *tk = &timekeeper; |
951ed4d3 MS |
330 | unsigned int seq; |
331 | s64 secs, nsecs; | |
332 | ||
333 | WARN_ON(timekeeping_suspended); | |
334 | ||
335 | do { | |
9a7a71b1 | 336 | seq = read_seqcount_begin(&timekeeper_seq); |
4e250fdd JS |
337 | secs = tk->xtime_sec + tk->wall_to_monotonic.tv_sec; |
338 | nsecs = timekeeping_get_ns(tk) + tk->wall_to_monotonic.tv_nsec; | |
951ed4d3 | 339 | |
9a7a71b1 | 340 | } while (read_seqcount_retry(&timekeeper_seq, seq)); |
951ed4d3 MS |
341 | /* |
342 | * Use ktime_set/ktime_add_ns to create a proper ktime on | |
343 | * 32-bit architectures without CONFIG_KTIME_SCALAR. | |
344 | */ | |
345 | return ktime_add_ns(ktime_set(secs, 0), nsecs); | |
346 | } | |
347 | EXPORT_SYMBOL_GPL(ktime_get); | |
348 | ||
349 | /** | |
350 | * ktime_get_ts - get the monotonic clock in timespec format | |
351 | * @ts: pointer to timespec variable | |
352 | * | |
353 | * The function calculates the monotonic clock from the realtime | |
354 | * clock and the wall_to_monotonic offset and stores the result | |
355 | * in normalized timespec format in the variable pointed to by @ts. | |
356 | */ | |
357 | void ktime_get_ts(struct timespec *ts) | |
358 | { | |
4e250fdd | 359 | struct timekeeper *tk = &timekeeper; |
951ed4d3 | 360 | struct timespec tomono; |
ec145bab | 361 | s64 nsec; |
951ed4d3 | 362 | unsigned int seq; |
951ed4d3 MS |
363 | |
364 | WARN_ON(timekeeping_suspended); | |
365 | ||
366 | do { | |
9a7a71b1 | 367 | seq = read_seqcount_begin(&timekeeper_seq); |
4e250fdd | 368 | ts->tv_sec = tk->xtime_sec; |
ec145bab | 369 | nsec = timekeeping_get_ns(tk); |
4e250fdd | 370 | tomono = tk->wall_to_monotonic; |
951ed4d3 | 371 | |
9a7a71b1 | 372 | } while (read_seqcount_retry(&timekeeper_seq, seq)); |
951ed4d3 | 373 | |
ec145bab JS |
374 | ts->tv_sec += tomono.tv_sec; |
375 | ts->tv_nsec = 0; | |
376 | timespec_add_ns(ts, nsec + tomono.tv_nsec); | |
951ed4d3 MS |
377 | } |
378 | EXPORT_SYMBOL_GPL(ktime_get_ts); | |
379 | ||
1ff3c967 JS |
380 | |
381 | /** | |
382 | * timekeeping_clocktai - Returns the TAI time of day in a timespec | |
383 | * @ts: pointer to the timespec to be set | |
384 | * | |
385 | * Returns the time of day in a timespec. | |
386 | */ | |
387 | void timekeeping_clocktai(struct timespec *ts) | |
388 | { | |
389 | struct timekeeper *tk = &timekeeper; | |
390 | unsigned long seq; | |
391 | u64 nsecs; | |
392 | ||
393 | WARN_ON(timekeeping_suspended); | |
394 | ||
395 | do { | |
9a7a71b1 | 396 | seq = read_seqcount_begin(&timekeeper_seq); |
1ff3c967 JS |
397 | |
398 | ts->tv_sec = tk->xtime_sec + tk->tai_offset; | |
399 | nsecs = timekeeping_get_ns(tk); | |
400 | ||
9a7a71b1 | 401 | } while (read_seqcount_retry(&timekeeper_seq, seq)); |
1ff3c967 JS |
402 | |
403 | ts->tv_nsec = 0; | |
404 | timespec_add_ns(ts, nsecs); | |
405 | ||
406 | } | |
407 | EXPORT_SYMBOL(timekeeping_clocktai); | |
408 | ||
409 | ||
90adda98 JS |
410 | /** |
411 | * ktime_get_clocktai - Returns the TAI time of day in a ktime | |
412 | * | |
413 | * Returns the time of day in a ktime. | |
414 | */ | |
415 | ktime_t ktime_get_clocktai(void) | |
416 | { | |
417 | struct timespec ts; | |
418 | ||
419 | timekeeping_clocktai(&ts); | |
420 | return timespec_to_ktime(ts); | |
421 | } | |
422 | EXPORT_SYMBOL(ktime_get_clocktai); | |
423 | ||
e2c18e49 AG |
424 | #ifdef CONFIG_NTP_PPS |
425 | ||
426 | /** | |
427 | * getnstime_raw_and_real - get day and raw monotonic time in timespec format | |
428 | * @ts_raw: pointer to the timespec to be set to raw monotonic time | |
429 | * @ts_real: pointer to the timespec to be set to the time of day | |
430 | * | |
431 | * This function reads both the time of day and raw monotonic time at the | |
432 | * same time atomically and stores the resulting timestamps in timespec | |
433 | * format. | |
434 | */ | |
435 | void getnstime_raw_and_real(struct timespec *ts_raw, struct timespec *ts_real) | |
436 | { | |
4e250fdd | 437 | struct timekeeper *tk = &timekeeper; |
e2c18e49 AG |
438 | unsigned long seq; |
439 | s64 nsecs_raw, nsecs_real; | |
440 | ||
441 | WARN_ON_ONCE(timekeeping_suspended); | |
442 | ||
443 | do { | |
9a7a71b1 | 444 | seq = read_seqcount_begin(&timekeeper_seq); |
e2c18e49 | 445 | |
4e250fdd JS |
446 | *ts_raw = tk->raw_time; |
447 | ts_real->tv_sec = tk->xtime_sec; | |
1e75fa8b | 448 | ts_real->tv_nsec = 0; |
e2c18e49 | 449 | |
4e250fdd JS |
450 | nsecs_raw = timekeeping_get_ns_raw(tk); |
451 | nsecs_real = timekeeping_get_ns(tk); | |
e2c18e49 | 452 | |
9a7a71b1 | 453 | } while (read_seqcount_retry(&timekeeper_seq, seq)); |
e2c18e49 AG |
454 | |
455 | timespec_add_ns(ts_raw, nsecs_raw); | |
456 | timespec_add_ns(ts_real, nsecs_real); | |
457 | } | |
458 | EXPORT_SYMBOL(getnstime_raw_and_real); | |
459 | ||
460 | #endif /* CONFIG_NTP_PPS */ | |
461 | ||
8524070b JS |
462 | /** |
463 | * do_gettimeofday - Returns the time of day in a timeval | |
464 | * @tv: pointer to the timeval to be set | |
465 | * | |
efd9ac86 | 466 | * NOTE: Users should be converted to using getnstimeofday() |
8524070b JS |
467 | */ |
468 | void do_gettimeofday(struct timeval *tv) | |
469 | { | |
470 | struct timespec now; | |
471 | ||
efd9ac86 | 472 | getnstimeofday(&now); |
8524070b JS |
473 | tv->tv_sec = now.tv_sec; |
474 | tv->tv_usec = now.tv_nsec/1000; | |
475 | } | |
8524070b | 476 | EXPORT_SYMBOL(do_gettimeofday); |
d239f49d | 477 | |
8524070b JS |
478 | /** |
479 | * do_settimeofday - Sets the time of day | |
480 | * @tv: pointer to the timespec variable containing the new time | |
481 | * | |
482 | * Sets the time of day to the new time and update NTP and notify hrtimers | |
483 | */ | |
1e6d7679 | 484 | int do_settimeofday(const struct timespec *tv) |
8524070b | 485 | { |
4e250fdd | 486 | struct timekeeper *tk = &timekeeper; |
1e75fa8b | 487 | struct timespec ts_delta, xt; |
92c1d3ed | 488 | unsigned long flags; |
8524070b | 489 | |
cee58483 | 490 | if (!timespec_valid_strict(tv)) |
8524070b JS |
491 | return -EINVAL; |
492 | ||
9a7a71b1 TG |
493 | raw_spin_lock_irqsave(&timekeeper_lock, flags); |
494 | write_seqcount_begin(&timekeeper_seq); | |
8524070b | 495 | |
4e250fdd | 496 | timekeeping_forward_now(tk); |
9a055117 | 497 | |
4e250fdd | 498 | xt = tk_xtime(tk); |
1e75fa8b JS |
499 | ts_delta.tv_sec = tv->tv_sec - xt.tv_sec; |
500 | ts_delta.tv_nsec = tv->tv_nsec - xt.tv_nsec; | |
501 | ||
4e250fdd | 502 | tk_set_wall_to_mono(tk, timespec_sub(tk->wall_to_monotonic, ts_delta)); |
8524070b | 503 | |
4e250fdd | 504 | tk_set_xtime(tk, tv); |
1e75fa8b | 505 | |
4e250fdd | 506 | timekeeping_update(tk, true); |
8524070b | 507 | |
9a7a71b1 TG |
508 | write_seqcount_end(&timekeeper_seq); |
509 | raw_spin_unlock_irqrestore(&timekeeper_lock, flags); | |
8524070b JS |
510 | |
511 | /* signal hrtimers about time change */ | |
512 | clock_was_set(); | |
513 | ||
514 | return 0; | |
515 | } | |
8524070b JS |
516 | EXPORT_SYMBOL(do_settimeofday); |
517 | ||
c528f7c6 JS |
518 | /** |
519 | * timekeeping_inject_offset - Adds or subtracts from the current time. | |
520 | * @tv: pointer to the timespec variable containing the offset | |
521 | * | |
522 | * Adds or subtracts an offset value from the current time. | |
523 | */ | |
524 | int timekeeping_inject_offset(struct timespec *ts) | |
525 | { | |
4e250fdd | 526 | struct timekeeper *tk = &timekeeper; |
92c1d3ed | 527 | unsigned long flags; |
4e8b1452 JS |
528 | struct timespec tmp; |
529 | int ret = 0; | |
c528f7c6 JS |
530 | |
531 | if ((unsigned long)ts->tv_nsec >= NSEC_PER_SEC) | |
532 | return -EINVAL; | |
533 | ||
9a7a71b1 TG |
534 | raw_spin_lock_irqsave(&timekeeper_lock, flags); |
535 | write_seqcount_begin(&timekeeper_seq); | |
c528f7c6 | 536 | |
4e250fdd | 537 | timekeeping_forward_now(tk); |
c528f7c6 | 538 | |
4e8b1452 JS |
539 | /* Make sure the proposed value is valid */ |
540 | tmp = timespec_add(tk_xtime(tk), *ts); | |
cee58483 | 541 | if (!timespec_valid_strict(&tmp)) { |
4e8b1452 JS |
542 | ret = -EINVAL; |
543 | goto error; | |
544 | } | |
1e75fa8b | 545 | |
4e250fdd JS |
546 | tk_xtime_add(tk, ts); |
547 | tk_set_wall_to_mono(tk, timespec_sub(tk->wall_to_monotonic, *ts)); | |
c528f7c6 | 548 | |
4e8b1452 | 549 | error: /* even if we error out, we forwarded the time, so call update */ |
4e250fdd | 550 | timekeeping_update(tk, true); |
c528f7c6 | 551 | |
9a7a71b1 TG |
552 | write_seqcount_end(&timekeeper_seq); |
553 | raw_spin_unlock_irqrestore(&timekeeper_lock, flags); | |
c528f7c6 JS |
554 | |
555 | /* signal hrtimers about time change */ | |
556 | clock_was_set(); | |
557 | ||
4e8b1452 | 558 | return ret; |
c528f7c6 JS |
559 | } |
560 | EXPORT_SYMBOL(timekeeping_inject_offset); | |
561 | ||
cc244dda JS |
562 | |
563 | /** | |
564 | * timekeeping_get_tai_offset - Returns current TAI offset from UTC | |
565 | * | |
566 | */ | |
567 | s32 timekeeping_get_tai_offset(void) | |
568 | { | |
569 | struct timekeeper *tk = &timekeeper; | |
570 | unsigned int seq; | |
571 | s32 ret; | |
572 | ||
573 | do { | |
9a7a71b1 | 574 | seq = read_seqcount_begin(&timekeeper_seq); |
cc244dda | 575 | ret = tk->tai_offset; |
9a7a71b1 | 576 | } while (read_seqcount_retry(&timekeeper_seq, seq)); |
cc244dda JS |
577 | |
578 | return ret; | |
579 | } | |
580 | ||
581 | /** | |
582 | * __timekeeping_set_tai_offset - Lock free worker function | |
583 | * | |
584 | */ | |
585 | void __timekeeping_set_tai_offset(struct timekeeper *tk, s32 tai_offset) | |
586 | { | |
587 | tk->tai_offset = tai_offset; | |
90adda98 | 588 | tk->offs_tai = ktime_sub(tk->offs_real, ktime_set(tai_offset, 0)); |
cc244dda JS |
589 | } |
590 | ||
591 | /** | |
592 | * timekeeping_set_tai_offset - Sets the current TAI offset from UTC | |
593 | * | |
594 | */ | |
595 | void timekeeping_set_tai_offset(s32 tai_offset) | |
596 | { | |
597 | struct timekeeper *tk = &timekeeper; | |
598 | unsigned long flags; | |
599 | ||
9a7a71b1 TG |
600 | raw_spin_lock_irqsave(&timekeeper_lock, flags); |
601 | write_seqcount_begin(&timekeeper_seq); | |
cc244dda | 602 | __timekeeping_set_tai_offset(tk, tai_offset); |
9a7a71b1 TG |
603 | write_seqcount_end(&timekeeper_seq); |
604 | raw_spin_unlock_irqrestore(&timekeeper_lock, flags); | |
cc244dda JS |
605 | } |
606 | ||
8524070b JS |
607 | /** |
608 | * change_clocksource - Swaps clocksources if a new one is available | |
609 | * | |
610 | * Accumulates current time interval and initializes new clocksource | |
611 | */ | |
75c5158f | 612 | static int change_clocksource(void *data) |
8524070b | 613 | { |
4e250fdd | 614 | struct timekeeper *tk = &timekeeper; |
4614e6ad | 615 | struct clocksource *new, *old; |
f695cf94 | 616 | unsigned long flags; |
8524070b | 617 | |
75c5158f | 618 | new = (struct clocksource *) data; |
8524070b | 619 | |
9a7a71b1 TG |
620 | raw_spin_lock_irqsave(&timekeeper_lock, flags); |
621 | write_seqcount_begin(&timekeeper_seq); | |
f695cf94 | 622 | |
4e250fdd | 623 | timekeeping_forward_now(tk); |
75c5158f | 624 | if (!new->enable || new->enable(new) == 0) { |
4e250fdd JS |
625 | old = tk->clock; |
626 | tk_setup_internals(tk, new); | |
75c5158f MS |
627 | if (old->disable) |
628 | old->disable(old); | |
629 | } | |
4e250fdd | 630 | timekeeping_update(tk, true); |
f695cf94 | 631 | |
9a7a71b1 TG |
632 | write_seqcount_end(&timekeeper_seq); |
633 | raw_spin_unlock_irqrestore(&timekeeper_lock, flags); | |
f695cf94 | 634 | |
75c5158f MS |
635 | return 0; |
636 | } | |
8524070b | 637 | |
75c5158f MS |
638 | /** |
639 | * timekeeping_notify - Install a new clock source | |
640 | * @clock: pointer to the clock source | |
641 | * | |
642 | * This function is called from clocksource.c after a new, better clock | |
643 | * source has been registered. The caller holds the clocksource_mutex. | |
644 | */ | |
645 | void timekeeping_notify(struct clocksource *clock) | |
646 | { | |
4e250fdd JS |
647 | struct timekeeper *tk = &timekeeper; |
648 | ||
649 | if (tk->clock == clock) | |
4614e6ad | 650 | return; |
75c5158f | 651 | stop_machine(change_clocksource, clock, NULL); |
8524070b | 652 | tick_clock_notify(); |
8524070b | 653 | } |
75c5158f | 654 | |
a40f262c TG |
655 | /** |
656 | * ktime_get_real - get the real (wall-) time in ktime_t format | |
657 | * | |
658 | * returns the time in ktime_t format | |
659 | */ | |
660 | ktime_t ktime_get_real(void) | |
661 | { | |
662 | struct timespec now; | |
663 | ||
664 | getnstimeofday(&now); | |
665 | ||
666 | return timespec_to_ktime(now); | |
667 | } | |
668 | EXPORT_SYMBOL_GPL(ktime_get_real); | |
8524070b | 669 | |
2d42244a JS |
670 | /** |
671 | * getrawmonotonic - Returns the raw monotonic time in a timespec | |
672 | * @ts: pointer to the timespec to be set | |
673 | * | |
674 | * Returns the raw monotonic time (completely un-modified by ntp) | |
675 | */ | |
676 | void getrawmonotonic(struct timespec *ts) | |
677 | { | |
4e250fdd | 678 | struct timekeeper *tk = &timekeeper; |
2d42244a JS |
679 | unsigned long seq; |
680 | s64 nsecs; | |
2d42244a JS |
681 | |
682 | do { | |
9a7a71b1 | 683 | seq = read_seqcount_begin(&timekeeper_seq); |
4e250fdd JS |
684 | nsecs = timekeeping_get_ns_raw(tk); |
685 | *ts = tk->raw_time; | |
2d42244a | 686 | |
9a7a71b1 | 687 | } while (read_seqcount_retry(&timekeeper_seq, seq)); |
2d42244a JS |
688 | |
689 | timespec_add_ns(ts, nsecs); | |
690 | } | |
691 | EXPORT_SYMBOL(getrawmonotonic); | |
692 | ||
8524070b | 693 | /** |
cf4fc6cb | 694 | * timekeeping_valid_for_hres - Check if timekeeping is suitable for hres |
8524070b | 695 | */ |
cf4fc6cb | 696 | int timekeeping_valid_for_hres(void) |
8524070b | 697 | { |
4e250fdd | 698 | struct timekeeper *tk = &timekeeper; |
8524070b JS |
699 | unsigned long seq; |
700 | int ret; | |
701 | ||
702 | do { | |
9a7a71b1 | 703 | seq = read_seqcount_begin(&timekeeper_seq); |
8524070b | 704 | |
4e250fdd | 705 | ret = tk->clock->flags & CLOCK_SOURCE_VALID_FOR_HRES; |
8524070b | 706 | |
9a7a71b1 | 707 | } while (read_seqcount_retry(&timekeeper_seq, seq)); |
8524070b JS |
708 | |
709 | return ret; | |
710 | } | |
711 | ||
98962465 JH |
712 | /** |
713 | * timekeeping_max_deferment - Returns max time the clocksource can be deferred | |
98962465 JH |
714 | */ |
715 | u64 timekeeping_max_deferment(void) | |
716 | { | |
4e250fdd | 717 | struct timekeeper *tk = &timekeeper; |
70471f2f JS |
718 | unsigned long seq; |
719 | u64 ret; | |
42e71e81 | 720 | |
70471f2f | 721 | do { |
9a7a71b1 | 722 | seq = read_seqcount_begin(&timekeeper_seq); |
70471f2f | 723 | |
4e250fdd | 724 | ret = tk->clock->max_idle_ns; |
70471f2f | 725 | |
9a7a71b1 | 726 | } while (read_seqcount_retry(&timekeeper_seq, seq)); |
70471f2f JS |
727 | |
728 | return ret; | |
98962465 JH |
729 | } |
730 | ||
8524070b | 731 | /** |
d4f587c6 | 732 | * read_persistent_clock - Return time from the persistent clock. |
8524070b JS |
733 | * |
734 | * Weak dummy function for arches that do not yet support it. | |
d4f587c6 MS |
735 | * Reads the time from the battery backed persistent clock. |
736 | * Returns a timespec with tv_sec=0 and tv_nsec=0 if unsupported. | |
8524070b JS |
737 | * |
738 | * XXX - Do be sure to remove it once all arches implement it. | |
739 | */ | |
d4f587c6 | 740 | void __attribute__((weak)) read_persistent_clock(struct timespec *ts) |
8524070b | 741 | { |
d4f587c6 MS |
742 | ts->tv_sec = 0; |
743 | ts->tv_nsec = 0; | |
8524070b JS |
744 | } |
745 | ||
23970e38 MS |
746 | /** |
747 | * read_boot_clock - Return time of the system start. | |
748 | * | |
749 | * Weak dummy function for arches that do not yet support it. | |
750 | * Function to read the exact time the system has been started. | |
751 | * Returns a timespec with tv_sec=0 and tv_nsec=0 if unsupported. | |
752 | * | |
753 | * XXX - Do be sure to remove it once all arches implement it. | |
754 | */ | |
755 | void __attribute__((weak)) read_boot_clock(struct timespec *ts) | |
756 | { | |
757 | ts->tv_sec = 0; | |
758 | ts->tv_nsec = 0; | |
759 | } | |
760 | ||
8524070b JS |
761 | /* |
762 | * timekeeping_init - Initializes the clocksource and common timekeeping values | |
763 | */ | |
764 | void __init timekeeping_init(void) | |
765 | { | |
4e250fdd | 766 | struct timekeeper *tk = &timekeeper; |
155ec602 | 767 | struct clocksource *clock; |
8524070b | 768 | unsigned long flags; |
6d0ef903 | 769 | struct timespec now, boot, tmp; |
d4f587c6 MS |
770 | |
771 | read_persistent_clock(&now); | |
31ade306 | 772 | |
cee58483 | 773 | if (!timespec_valid_strict(&now)) { |
4e8b1452 JS |
774 | pr_warn("WARNING: Persistent clock returned invalid value!\n" |
775 | " Check your CMOS/BIOS settings.\n"); | |
776 | now.tv_sec = 0; | |
777 | now.tv_nsec = 0; | |
31ade306 FT |
778 | } else if (now.tv_sec || now.tv_nsec) |
779 | persistent_clock_exist = true; | |
4e8b1452 | 780 | |
23970e38 | 781 | read_boot_clock(&boot); |
cee58483 | 782 | if (!timespec_valid_strict(&boot)) { |
4e8b1452 JS |
783 | pr_warn("WARNING: Boot clock returned invalid value!\n" |
784 | " Check your CMOS/BIOS settings.\n"); | |
785 | boot.tv_sec = 0; | |
786 | boot.tv_nsec = 0; | |
787 | } | |
8524070b | 788 | |
7dffa3c6 | 789 | ntp_init(); |
8524070b | 790 | |
9a7a71b1 TG |
791 | raw_spin_lock_irqsave(&timekeeper_lock, flags); |
792 | write_seqcount_begin(&timekeeper_seq); | |
f1b82746 | 793 | clock = clocksource_default_clock(); |
a0f7d48b MS |
794 | if (clock->enable) |
795 | clock->enable(clock); | |
4e250fdd | 796 | tk_setup_internals(tk, clock); |
8524070b | 797 | |
4e250fdd JS |
798 | tk_set_xtime(tk, &now); |
799 | tk->raw_time.tv_sec = 0; | |
800 | tk->raw_time.tv_nsec = 0; | |
1e75fa8b | 801 | if (boot.tv_sec == 0 && boot.tv_nsec == 0) |
4e250fdd | 802 | boot = tk_xtime(tk); |
1e75fa8b | 803 | |
6d0ef903 | 804 | set_normalized_timespec(&tmp, -boot.tv_sec, -boot.tv_nsec); |
4e250fdd | 805 | tk_set_wall_to_mono(tk, tmp); |
6d0ef903 JS |
806 | |
807 | tmp.tv_sec = 0; | |
808 | tmp.tv_nsec = 0; | |
4e250fdd | 809 | tk_set_sleep_time(tk, tmp); |
6d0ef903 | 810 | |
9a7a71b1 TG |
811 | write_seqcount_end(&timekeeper_seq); |
812 | raw_spin_unlock_irqrestore(&timekeeper_lock, flags); | |
8524070b JS |
813 | } |
814 | ||
8524070b | 815 | /* time in seconds when suspend began */ |
d4f587c6 | 816 | static struct timespec timekeeping_suspend_time; |
8524070b | 817 | |
304529b1 JS |
818 | /** |
819 | * __timekeeping_inject_sleeptime - Internal function to add sleep interval | |
820 | * @delta: pointer to a timespec delta value | |
821 | * | |
822 | * Takes a timespec offset measuring a suspend interval and properly | |
823 | * adds the sleep offset to the timekeeping variables. | |
824 | */ | |
f726a697 JS |
825 | static void __timekeeping_inject_sleeptime(struct timekeeper *tk, |
826 | struct timespec *delta) | |
304529b1 | 827 | { |
cee58483 | 828 | if (!timespec_valid_strict(delta)) { |
cbaa5152 | 829 | printk(KERN_WARNING "__timekeeping_inject_sleeptime: Invalid " |
cb5de2f8 JS |
830 | "sleep delta value!\n"); |
831 | return; | |
832 | } | |
f726a697 | 833 | tk_xtime_add(tk, delta); |
6d0ef903 JS |
834 | tk_set_wall_to_mono(tk, timespec_sub(tk->wall_to_monotonic, *delta)); |
835 | tk_set_sleep_time(tk, timespec_add(tk->total_sleep_time, *delta)); | |
304529b1 JS |
836 | } |
837 | ||
304529b1 JS |
838 | /** |
839 | * timekeeping_inject_sleeptime - Adds suspend interval to timeekeeping values | |
840 | * @delta: pointer to a timespec delta value | |
841 | * | |
842 | * This hook is for architectures that cannot support read_persistent_clock | |
843 | * because their RTC/persistent clock is only accessible when irqs are enabled. | |
844 | * | |
845 | * This function should only be called by rtc_resume(), and allows | |
846 | * a suspend offset to be injected into the timekeeping values. | |
847 | */ | |
848 | void timekeeping_inject_sleeptime(struct timespec *delta) | |
849 | { | |
4e250fdd | 850 | struct timekeeper *tk = &timekeeper; |
92c1d3ed | 851 | unsigned long flags; |
304529b1 | 852 | |
31ade306 FT |
853 | /* |
854 | * Make sure we don't set the clock twice, as timekeeping_resume() | |
855 | * already did it | |
856 | */ | |
857 | if (has_persistent_clock()) | |
304529b1 JS |
858 | return; |
859 | ||
9a7a71b1 TG |
860 | raw_spin_lock_irqsave(&timekeeper_lock, flags); |
861 | write_seqcount_begin(&timekeeper_seq); | |
70471f2f | 862 | |
4e250fdd | 863 | timekeeping_forward_now(tk); |
304529b1 | 864 | |
4e250fdd | 865 | __timekeeping_inject_sleeptime(tk, delta); |
304529b1 | 866 | |
4e250fdd | 867 | timekeeping_update(tk, true); |
304529b1 | 868 | |
9a7a71b1 TG |
869 | write_seqcount_end(&timekeeper_seq); |
870 | raw_spin_unlock_irqrestore(&timekeeper_lock, flags); | |
304529b1 JS |
871 | |
872 | /* signal hrtimers about time change */ | |
873 | clock_was_set(); | |
874 | } | |
875 | ||
8524070b JS |
876 | /** |
877 | * timekeeping_resume - Resumes the generic timekeeping subsystem. | |
8524070b JS |
878 | * |
879 | * This is for the generic clocksource timekeeping. | |
880 | * xtime/wall_to_monotonic/jiffies/etc are | |
881 | * still managed by arch specific suspend/resume code. | |
882 | */ | |
e1a85b2c | 883 | static void timekeeping_resume(void) |
8524070b | 884 | { |
4e250fdd | 885 | struct timekeeper *tk = &timekeeper; |
e445cf1c | 886 | struct clocksource *clock = tk->clock; |
92c1d3ed | 887 | unsigned long flags; |
e445cf1c FT |
888 | struct timespec ts_new, ts_delta; |
889 | cycle_t cycle_now, cycle_delta; | |
890 | bool suspendtime_found = false; | |
d4f587c6 | 891 | |
e445cf1c | 892 | read_persistent_clock(&ts_new); |
8524070b | 893 | |
adc78e6b | 894 | clockevents_resume(); |
d10ff3fb TG |
895 | clocksource_resume(); |
896 | ||
9a7a71b1 TG |
897 | raw_spin_lock_irqsave(&timekeeper_lock, flags); |
898 | write_seqcount_begin(&timekeeper_seq); | |
8524070b | 899 | |
e445cf1c FT |
900 | /* |
901 | * After system resumes, we need to calculate the suspended time and | |
902 | * compensate it for the OS time. There are 3 sources that could be | |
903 | * used: Nonstop clocksource during suspend, persistent clock and rtc | |
904 | * device. | |
905 | * | |
906 | * One specific platform may have 1 or 2 or all of them, and the | |
907 | * preference will be: | |
908 | * suspend-nonstop clocksource -> persistent clock -> rtc | |
909 | * The less preferred source will only be tried if there is no better | |
910 | * usable source. The rtc part is handled separately in rtc core code. | |
911 | */ | |
912 | cycle_now = clock->read(clock); | |
913 | if ((clock->flags & CLOCK_SOURCE_SUSPEND_NONSTOP) && | |
914 | cycle_now > clock->cycle_last) { | |
915 | u64 num, max = ULLONG_MAX; | |
916 | u32 mult = clock->mult; | |
917 | u32 shift = clock->shift; | |
918 | s64 nsec = 0; | |
919 | ||
920 | cycle_delta = (cycle_now - clock->cycle_last) & clock->mask; | |
921 | ||
922 | /* | |
923 | * "cycle_delta * mutl" may cause 64 bits overflow, if the | |
924 | * suspended time is too long. In that case we need do the | |
925 | * 64 bits math carefully | |
926 | */ | |
927 | do_div(max, mult); | |
928 | if (cycle_delta > max) { | |
929 | num = div64_u64(cycle_delta, max); | |
930 | nsec = (((u64) max * mult) >> shift) * num; | |
931 | cycle_delta -= num * max; | |
932 | } | |
933 | nsec += ((u64) cycle_delta * mult) >> shift; | |
934 | ||
935 | ts_delta = ns_to_timespec(nsec); | |
936 | suspendtime_found = true; | |
937 | } else if (timespec_compare(&ts_new, &timekeeping_suspend_time) > 0) { | |
938 | ts_delta = timespec_sub(ts_new, timekeeping_suspend_time); | |
939 | suspendtime_found = true; | |
8524070b | 940 | } |
e445cf1c FT |
941 | |
942 | if (suspendtime_found) | |
943 | __timekeeping_inject_sleeptime(tk, &ts_delta); | |
944 | ||
945 | /* Re-base the last cycle value */ | |
946 | clock->cycle_last = cycle_now; | |
4e250fdd | 947 | tk->ntp_error = 0; |
8524070b | 948 | timekeeping_suspended = 0; |
4e250fdd | 949 | timekeeping_update(tk, false); |
9a7a71b1 TG |
950 | write_seqcount_end(&timekeeper_seq); |
951 | raw_spin_unlock_irqrestore(&timekeeper_lock, flags); | |
8524070b JS |
952 | |
953 | touch_softlockup_watchdog(); | |
954 | ||
955 | clockevents_notify(CLOCK_EVT_NOTIFY_RESUME, NULL); | |
956 | ||
957 | /* Resume hrtimers */ | |
b12a03ce | 958 | hrtimers_resume(); |
8524070b JS |
959 | } |
960 | ||
e1a85b2c | 961 | static int timekeeping_suspend(void) |
8524070b | 962 | { |
4e250fdd | 963 | struct timekeeper *tk = &timekeeper; |
92c1d3ed | 964 | unsigned long flags; |
cb33217b JS |
965 | struct timespec delta, delta_delta; |
966 | static struct timespec old_delta; | |
8524070b | 967 | |
d4f587c6 | 968 | read_persistent_clock(&timekeeping_suspend_time); |
3be90950 | 969 | |
9a7a71b1 TG |
970 | raw_spin_lock_irqsave(&timekeeper_lock, flags); |
971 | write_seqcount_begin(&timekeeper_seq); | |
4e250fdd | 972 | timekeeping_forward_now(tk); |
8524070b | 973 | timekeeping_suspended = 1; |
cb33217b JS |
974 | |
975 | /* | |
976 | * To avoid drift caused by repeated suspend/resumes, | |
977 | * which each can add ~1 second drift error, | |
978 | * try to compensate so the difference in system time | |
979 | * and persistent_clock time stays close to constant. | |
980 | */ | |
4e250fdd | 981 | delta = timespec_sub(tk_xtime(tk), timekeeping_suspend_time); |
cb33217b JS |
982 | delta_delta = timespec_sub(delta, old_delta); |
983 | if (abs(delta_delta.tv_sec) >= 2) { | |
984 | /* | |
985 | * if delta_delta is too large, assume time correction | |
986 | * has occured and set old_delta to the current delta. | |
987 | */ | |
988 | old_delta = delta; | |
989 | } else { | |
990 | /* Otherwise try to adjust old_system to compensate */ | |
991 | timekeeping_suspend_time = | |
992 | timespec_add(timekeeping_suspend_time, delta_delta); | |
993 | } | |
9a7a71b1 TG |
994 | write_seqcount_end(&timekeeper_seq); |
995 | raw_spin_unlock_irqrestore(&timekeeper_lock, flags); | |
8524070b JS |
996 | |
997 | clockevents_notify(CLOCK_EVT_NOTIFY_SUSPEND, NULL); | |
c54a42b1 | 998 | clocksource_suspend(); |
adc78e6b | 999 | clockevents_suspend(); |
8524070b JS |
1000 | |
1001 | return 0; | |
1002 | } | |
1003 | ||
1004 | /* sysfs resume/suspend bits for timekeeping */ | |
e1a85b2c | 1005 | static struct syscore_ops timekeeping_syscore_ops = { |
8524070b JS |
1006 | .resume = timekeeping_resume, |
1007 | .suspend = timekeeping_suspend, | |
8524070b JS |
1008 | }; |
1009 | ||
e1a85b2c | 1010 | static int __init timekeeping_init_ops(void) |
8524070b | 1011 | { |
e1a85b2c RW |
1012 | register_syscore_ops(&timekeeping_syscore_ops); |
1013 | return 0; | |
8524070b JS |
1014 | } |
1015 | ||
e1a85b2c | 1016 | device_initcall(timekeeping_init_ops); |
8524070b JS |
1017 | |
1018 | /* | |
1019 | * If the error is already larger, we look ahead even further | |
1020 | * to compensate for late or lost adjustments. | |
1021 | */ | |
f726a697 JS |
1022 | static __always_inline int timekeeping_bigadjust(struct timekeeper *tk, |
1023 | s64 error, s64 *interval, | |
8524070b JS |
1024 | s64 *offset) |
1025 | { | |
1026 | s64 tick_error, i; | |
1027 | u32 look_ahead, adj; | |
1028 | s32 error2, mult; | |
1029 | ||
1030 | /* | |
1031 | * Use the current error value to determine how much to look ahead. | |
1032 | * The larger the error the slower we adjust for it to avoid problems | |
1033 | * with losing too many ticks, otherwise we would overadjust and | |
1034 | * produce an even larger error. The smaller the adjustment the | |
1035 | * faster we try to adjust for it, as lost ticks can do less harm | |
3eb05676 | 1036 | * here. This is tuned so that an error of about 1 msec is adjusted |
8524070b JS |
1037 | * within about 1 sec (or 2^20 nsec in 2^SHIFT_HZ ticks). |
1038 | */ | |
f726a697 | 1039 | error2 = tk->ntp_error >> (NTP_SCALE_SHIFT + 22 - 2 * SHIFT_HZ); |
8524070b JS |
1040 | error2 = abs(error2); |
1041 | for (look_ahead = 0; error2 > 0; look_ahead++) | |
1042 | error2 >>= 2; | |
1043 | ||
1044 | /* | |
1045 | * Now calculate the error in (1 << look_ahead) ticks, but first | |
1046 | * remove the single look ahead already included in the error. | |
1047 | */ | |
f726a697 JS |
1048 | tick_error = ntp_tick_length() >> (tk->ntp_error_shift + 1); |
1049 | tick_error -= tk->xtime_interval >> 1; | |
8524070b JS |
1050 | error = ((error - tick_error) >> look_ahead) + tick_error; |
1051 | ||
1052 | /* Finally calculate the adjustment shift value. */ | |
1053 | i = *interval; | |
1054 | mult = 1; | |
1055 | if (error < 0) { | |
1056 | error = -error; | |
1057 | *interval = -*interval; | |
1058 | *offset = -*offset; | |
1059 | mult = -1; | |
1060 | } | |
1061 | for (adj = 0; error > i; adj++) | |
1062 | error >>= 1; | |
1063 | ||
1064 | *interval <<= adj; | |
1065 | *offset <<= adj; | |
1066 | return mult << adj; | |
1067 | } | |
1068 | ||
1069 | /* | |
1070 | * Adjust the multiplier to reduce the error value, | |
1071 | * this is optimized for the most common adjustments of -1,0,1, | |
1072 | * for other values we can do a bit more work. | |
1073 | */ | |
f726a697 | 1074 | static void timekeeping_adjust(struct timekeeper *tk, s64 offset) |
8524070b | 1075 | { |
f726a697 | 1076 | s64 error, interval = tk->cycle_interval; |
8524070b JS |
1077 | int adj; |
1078 | ||
c2bc1111 | 1079 | /* |
88b28adf | 1080 | * The point of this is to check if the error is greater than half |
c2bc1111 JS |
1081 | * an interval. |
1082 | * | |
1083 | * First we shift it down from NTP_SHIFT to clocksource->shifted nsecs. | |
1084 | * | |
1085 | * Note we subtract one in the shift, so that error is really error*2. | |
3f86f28f JS |
1086 | * This "saves" dividing(shifting) interval twice, but keeps the |
1087 | * (error > interval) comparison as still measuring if error is | |
88b28adf | 1088 | * larger than half an interval. |
c2bc1111 | 1089 | * |
3f86f28f | 1090 | * Note: It does not "save" on aggravation when reading the code. |
c2bc1111 | 1091 | */ |
f726a697 | 1092 | error = tk->ntp_error >> (tk->ntp_error_shift - 1); |
8524070b | 1093 | if (error > interval) { |
c2bc1111 JS |
1094 | /* |
1095 | * We now divide error by 4(via shift), which checks if | |
88b28adf | 1096 | * the error is greater than twice the interval. |
c2bc1111 JS |
1097 | * If it is greater, we need a bigadjust, if its smaller, |
1098 | * we can adjust by 1. | |
1099 | */ | |
8524070b | 1100 | error >>= 2; |
c2bc1111 JS |
1101 | /* |
1102 | * XXX - In update_wall_time, we round up to the next | |
1103 | * nanosecond, and store the amount rounded up into | |
1104 | * the error. This causes the likely below to be unlikely. | |
1105 | * | |
3f86f28f | 1106 | * The proper fix is to avoid rounding up by using |
4e250fdd | 1107 | * the high precision tk->xtime_nsec instead of |
c2bc1111 JS |
1108 | * xtime.tv_nsec everywhere. Fixing this will take some |
1109 | * time. | |
1110 | */ | |
8524070b JS |
1111 | if (likely(error <= interval)) |
1112 | adj = 1; | |
1113 | else | |
1d17d174 IM |
1114 | adj = timekeeping_bigadjust(tk, error, &interval, &offset); |
1115 | } else { | |
1116 | if (error < -interval) { | |
1117 | /* See comment above, this is just switched for the negative */ | |
1118 | error >>= 2; | |
1119 | if (likely(error >= -interval)) { | |
1120 | adj = -1; | |
1121 | interval = -interval; | |
1122 | offset = -offset; | |
1123 | } else { | |
1124 | adj = timekeeping_bigadjust(tk, error, &interval, &offset); | |
1125 | } | |
1126 | } else { | |
1127 | goto out_adjust; | |
1128 | } | |
1129 | } | |
8524070b | 1130 | |
f726a697 JS |
1131 | if (unlikely(tk->clock->maxadj && |
1132 | (tk->mult + adj > tk->clock->mult + tk->clock->maxadj))) { | |
e919cfd4 JS |
1133 | printk_once(KERN_WARNING |
1134 | "Adjusting %s more than 11%% (%ld vs %ld)\n", | |
f726a697 JS |
1135 | tk->clock->name, (long)tk->mult + adj, |
1136 | (long)tk->clock->mult + tk->clock->maxadj); | |
e919cfd4 | 1137 | } |
c2bc1111 JS |
1138 | /* |
1139 | * So the following can be confusing. | |
1140 | * | |
1141 | * To keep things simple, lets assume adj == 1 for now. | |
1142 | * | |
1143 | * When adj != 1, remember that the interval and offset values | |
1144 | * have been appropriately scaled so the math is the same. | |
1145 | * | |
1146 | * The basic idea here is that we're increasing the multiplier | |
1147 | * by one, this causes the xtime_interval to be incremented by | |
1148 | * one cycle_interval. This is because: | |
1149 | * xtime_interval = cycle_interval * mult | |
1150 | * So if mult is being incremented by one: | |
1151 | * xtime_interval = cycle_interval * (mult + 1) | |
1152 | * Its the same as: | |
1153 | * xtime_interval = (cycle_interval * mult) + cycle_interval | |
1154 | * Which can be shortened to: | |
1155 | * xtime_interval += cycle_interval | |
1156 | * | |
1157 | * So offset stores the non-accumulated cycles. Thus the current | |
1158 | * time (in shifted nanoseconds) is: | |
1159 | * now = (offset * adj) + xtime_nsec | |
1160 | * Now, even though we're adjusting the clock frequency, we have | |
1161 | * to keep time consistent. In other words, we can't jump back | |
1162 | * in time, and we also want to avoid jumping forward in time. | |
1163 | * | |
1164 | * So given the same offset value, we need the time to be the same | |
1165 | * both before and after the freq adjustment. | |
1166 | * now = (offset * adj_1) + xtime_nsec_1 | |
1167 | * now = (offset * adj_2) + xtime_nsec_2 | |
1168 | * So: | |
1169 | * (offset * adj_1) + xtime_nsec_1 = | |
1170 | * (offset * adj_2) + xtime_nsec_2 | |
1171 | * And we know: | |
1172 | * adj_2 = adj_1 + 1 | |
1173 | * So: | |
1174 | * (offset * adj_1) + xtime_nsec_1 = | |
1175 | * (offset * (adj_1+1)) + xtime_nsec_2 | |
1176 | * (offset * adj_1) + xtime_nsec_1 = | |
1177 | * (offset * adj_1) + offset + xtime_nsec_2 | |
1178 | * Canceling the sides: | |
1179 | * xtime_nsec_1 = offset + xtime_nsec_2 | |
1180 | * Which gives us: | |
1181 | * xtime_nsec_2 = xtime_nsec_1 - offset | |
1182 | * Which simplfies to: | |
1183 | * xtime_nsec -= offset | |
1184 | * | |
1185 | * XXX - TODO: Doc ntp_error calculation. | |
1186 | */ | |
f726a697 JS |
1187 | tk->mult += adj; |
1188 | tk->xtime_interval += interval; | |
1189 | tk->xtime_nsec -= offset; | |
1190 | tk->ntp_error -= (interval - offset) << tk->ntp_error_shift; | |
2a8c0883 | 1191 | |
1d17d174 | 1192 | out_adjust: |
2a8c0883 JS |
1193 | /* |
1194 | * It may be possible that when we entered this function, xtime_nsec | |
1195 | * was very small. Further, if we're slightly speeding the clocksource | |
1196 | * in the code above, its possible the required corrective factor to | |
1197 | * xtime_nsec could cause it to underflow. | |
1198 | * | |
1199 | * Now, since we already accumulated the second, cannot simply roll | |
1200 | * the accumulated second back, since the NTP subsystem has been | |
1201 | * notified via second_overflow. So instead we push xtime_nsec forward | |
1202 | * by the amount we underflowed, and add that amount into the error. | |
1203 | * | |
1204 | * We'll correct this error next time through this function, when | |
1205 | * xtime_nsec is not as small. | |
1206 | */ | |
f726a697 JS |
1207 | if (unlikely((s64)tk->xtime_nsec < 0)) { |
1208 | s64 neg = -(s64)tk->xtime_nsec; | |
1209 | tk->xtime_nsec = 0; | |
1210 | tk->ntp_error += neg << tk->ntp_error_shift; | |
2a8c0883 JS |
1211 | } |
1212 | ||
8524070b JS |
1213 | } |
1214 | ||
1f4f9487 JS |
1215 | /** |
1216 | * accumulate_nsecs_to_secs - Accumulates nsecs into secs | |
1217 | * | |
1218 | * Helper function that accumulates a the nsecs greater then a second | |
1219 | * from the xtime_nsec field to the xtime_secs field. | |
1220 | * It also calls into the NTP code to handle leapsecond processing. | |
1221 | * | |
1222 | */ | |
1223 | static inline void accumulate_nsecs_to_secs(struct timekeeper *tk) | |
1224 | { | |
1225 | u64 nsecps = (u64)NSEC_PER_SEC << tk->shift; | |
1226 | ||
1227 | while (tk->xtime_nsec >= nsecps) { | |
1228 | int leap; | |
1229 | ||
1230 | tk->xtime_nsec -= nsecps; | |
1231 | tk->xtime_sec++; | |
1232 | ||
1233 | /* Figure out if its a leap sec and apply if needed */ | |
1234 | leap = second_overflow(tk->xtime_sec); | |
6d0ef903 JS |
1235 | if (unlikely(leap)) { |
1236 | struct timespec ts; | |
1237 | ||
1238 | tk->xtime_sec += leap; | |
1f4f9487 | 1239 | |
6d0ef903 JS |
1240 | ts.tv_sec = leap; |
1241 | ts.tv_nsec = 0; | |
1242 | tk_set_wall_to_mono(tk, | |
1243 | timespec_sub(tk->wall_to_monotonic, ts)); | |
1244 | ||
cc244dda JS |
1245 | __timekeeping_set_tai_offset(tk, tk->tai_offset - leap); |
1246 | ||
6d0ef903 JS |
1247 | clock_was_set_delayed(); |
1248 | } | |
1f4f9487 JS |
1249 | } |
1250 | } | |
1251 | ||
a092ff0f JS |
1252 | /** |
1253 | * logarithmic_accumulation - shifted accumulation of cycles | |
1254 | * | |
1255 | * This functions accumulates a shifted interval of cycles into | |
1256 | * into a shifted interval nanoseconds. Allows for O(log) accumulation | |
1257 | * loop. | |
1258 | * | |
1259 | * Returns the unconsumed cycles. | |
1260 | */ | |
f726a697 JS |
1261 | static cycle_t logarithmic_accumulation(struct timekeeper *tk, cycle_t offset, |
1262 | u32 shift) | |
a092ff0f | 1263 | { |
23a9537a | 1264 | cycle_t interval = tk->cycle_interval << shift; |
deda2e81 | 1265 | u64 raw_nsecs; |
a092ff0f | 1266 | |
f726a697 | 1267 | /* If the offset is smaller then a shifted interval, do nothing */ |
23a9537a | 1268 | if (offset < interval) |
a092ff0f JS |
1269 | return offset; |
1270 | ||
1271 | /* Accumulate one shifted interval */ | |
23a9537a TG |
1272 | offset -= interval; |
1273 | tk->clock->cycle_last += interval; | |
a092ff0f | 1274 | |
f726a697 JS |
1275 | tk->xtime_nsec += tk->xtime_interval << shift; |
1276 | accumulate_nsecs_to_secs(tk); | |
a092ff0f | 1277 | |
deda2e81 | 1278 | /* Accumulate raw time */ |
5b3900cd | 1279 | raw_nsecs = (u64)tk->raw_interval << shift; |
f726a697 | 1280 | raw_nsecs += tk->raw_time.tv_nsec; |
c7dcf87a JS |
1281 | if (raw_nsecs >= NSEC_PER_SEC) { |
1282 | u64 raw_secs = raw_nsecs; | |
1283 | raw_nsecs = do_div(raw_secs, NSEC_PER_SEC); | |
f726a697 | 1284 | tk->raw_time.tv_sec += raw_secs; |
a092ff0f | 1285 | } |
f726a697 | 1286 | tk->raw_time.tv_nsec = raw_nsecs; |
a092ff0f JS |
1287 | |
1288 | /* Accumulate error between NTP and clock interval */ | |
f726a697 JS |
1289 | tk->ntp_error += ntp_tick_length() << shift; |
1290 | tk->ntp_error -= (tk->xtime_interval + tk->xtime_remainder) << | |
1291 | (tk->ntp_error_shift + shift); | |
a092ff0f JS |
1292 | |
1293 | return offset; | |
1294 | } | |
1295 | ||
92bb1fcf JS |
1296 | #ifdef CONFIG_GENERIC_TIME_VSYSCALL_OLD |
1297 | static inline void old_vsyscall_fixup(struct timekeeper *tk) | |
1298 | { | |
1299 | s64 remainder; | |
1300 | ||
1301 | /* | |
1302 | * Store only full nanoseconds into xtime_nsec after rounding | |
1303 | * it up and add the remainder to the error difference. | |
1304 | * XXX - This is necessary to avoid small 1ns inconsistnecies caused | |
1305 | * by truncating the remainder in vsyscalls. However, it causes | |
1306 | * additional work to be done in timekeeping_adjust(). Once | |
1307 | * the vsyscall implementations are converted to use xtime_nsec | |
1308 | * (shifted nanoseconds), and CONFIG_GENERIC_TIME_VSYSCALL_OLD | |
1309 | * users are removed, this can be killed. | |
1310 | */ | |
1311 | remainder = tk->xtime_nsec & ((1ULL << tk->shift) - 1); | |
1312 | tk->xtime_nsec -= remainder; | |
1313 | tk->xtime_nsec += 1ULL << tk->shift; | |
1314 | tk->ntp_error += remainder << tk->ntp_error_shift; | |
1315 | ||
1316 | } | |
1317 | #else | |
1318 | #define old_vsyscall_fixup(tk) | |
1319 | #endif | |
1320 | ||
1321 | ||
1322 | ||
8524070b JS |
1323 | /** |
1324 | * update_wall_time - Uses the current clocksource to increment the wall time | |
1325 | * | |
8524070b | 1326 | */ |
871cf1e5 | 1327 | static void update_wall_time(void) |
8524070b | 1328 | { |
155ec602 | 1329 | struct clocksource *clock; |
4e250fdd | 1330 | struct timekeeper *tk = &timekeeper; |
8524070b | 1331 | cycle_t offset; |
a092ff0f | 1332 | int shift = 0, maxshift; |
70471f2f JS |
1333 | unsigned long flags; |
1334 | ||
9a7a71b1 TG |
1335 | raw_spin_lock_irqsave(&timekeeper_lock, flags); |
1336 | write_seqcount_begin(&timekeeper_seq); | |
8524070b JS |
1337 | |
1338 | /* Make sure we're fully resumed: */ | |
1339 | if (unlikely(timekeeping_suspended)) | |
70471f2f | 1340 | goto out; |
8524070b | 1341 | |
4e250fdd | 1342 | clock = tk->clock; |
592913ec JS |
1343 | |
1344 | #ifdef CONFIG_ARCH_USES_GETTIMEOFFSET | |
4e250fdd | 1345 | offset = tk->cycle_interval; |
592913ec JS |
1346 | #else |
1347 | offset = (clock->read(clock) - clock->cycle_last) & clock->mask; | |
8524070b | 1348 | #endif |
8524070b | 1349 | |
bf2ac312 JS |
1350 | /* Check if there's really nothing to do */ |
1351 | if (offset < tk->cycle_interval) | |
1352 | goto out; | |
1353 | ||
a092ff0f JS |
1354 | /* |
1355 | * With NO_HZ we may have to accumulate many cycle_intervals | |
1356 | * (think "ticks") worth of time at once. To do this efficiently, | |
1357 | * we calculate the largest doubling multiple of cycle_intervals | |
88b28adf | 1358 | * that is smaller than the offset. We then accumulate that |
a092ff0f JS |
1359 | * chunk in one go, and then try to consume the next smaller |
1360 | * doubled multiple. | |
8524070b | 1361 | */ |
4e250fdd | 1362 | shift = ilog2(offset) - ilog2(tk->cycle_interval); |
a092ff0f | 1363 | shift = max(0, shift); |
88b28adf | 1364 | /* Bound shift to one less than what overflows tick_length */ |
ea7cf49a | 1365 | maxshift = (64 - (ilog2(ntp_tick_length())+1)) - 1; |
a092ff0f | 1366 | shift = min(shift, maxshift); |
4e250fdd JS |
1367 | while (offset >= tk->cycle_interval) { |
1368 | offset = logarithmic_accumulation(tk, offset, shift); | |
1369 | if (offset < tk->cycle_interval<<shift) | |
830ec045 | 1370 | shift--; |
8524070b JS |
1371 | } |
1372 | ||
1373 | /* correct the clock when NTP error is too big */ | |
4e250fdd | 1374 | timekeeping_adjust(tk, offset); |
8524070b | 1375 | |
6a867a39 | 1376 | /* |
92bb1fcf JS |
1377 | * XXX This can be killed once everyone converts |
1378 | * to the new update_vsyscall. | |
1379 | */ | |
1380 | old_vsyscall_fixup(tk); | |
8524070b | 1381 | |
6a867a39 JS |
1382 | /* |
1383 | * Finally, make sure that after the rounding | |
1e75fa8b | 1384 | * xtime_nsec isn't larger than NSEC_PER_SEC |
6a867a39 | 1385 | */ |
4e250fdd | 1386 | accumulate_nsecs_to_secs(tk); |
83f57a11 | 1387 | |
4e250fdd | 1388 | timekeeping_update(tk, false); |
70471f2f JS |
1389 | |
1390 | out: | |
9a7a71b1 TG |
1391 | write_seqcount_end(&timekeeper_seq); |
1392 | raw_spin_unlock_irqrestore(&timekeeper_lock, flags); | |
70471f2f | 1393 | |
8524070b | 1394 | } |
7c3f1a57 TJ |
1395 | |
1396 | /** | |
1397 | * getboottime - Return the real time of system boot. | |
1398 | * @ts: pointer to the timespec to be set | |
1399 | * | |
abb3a4ea | 1400 | * Returns the wall-time of boot in a timespec. |
7c3f1a57 TJ |
1401 | * |
1402 | * This is based on the wall_to_monotonic offset and the total suspend | |
1403 | * time. Calls to settimeofday will affect the value returned (which | |
1404 | * basically means that however wrong your real time clock is at boot time, | |
1405 | * you get the right time here). | |
1406 | */ | |
1407 | void getboottime(struct timespec *ts) | |
1408 | { | |
4e250fdd | 1409 | struct timekeeper *tk = &timekeeper; |
36d47481 | 1410 | struct timespec boottime = { |
4e250fdd JS |
1411 | .tv_sec = tk->wall_to_monotonic.tv_sec + |
1412 | tk->total_sleep_time.tv_sec, | |
1413 | .tv_nsec = tk->wall_to_monotonic.tv_nsec + | |
1414 | tk->total_sleep_time.tv_nsec | |
36d47481 | 1415 | }; |
d4f587c6 | 1416 | |
d4f587c6 | 1417 | set_normalized_timespec(ts, -boottime.tv_sec, -boottime.tv_nsec); |
7c3f1a57 | 1418 | } |
c93d89f3 | 1419 | EXPORT_SYMBOL_GPL(getboottime); |
7c3f1a57 | 1420 | |
abb3a4ea JS |
1421 | /** |
1422 | * get_monotonic_boottime - Returns monotonic time since boot | |
1423 | * @ts: pointer to the timespec to be set | |
1424 | * | |
1425 | * Returns the monotonic time since boot in a timespec. | |
1426 | * | |
1427 | * This is similar to CLOCK_MONTONIC/ktime_get_ts, but also | |
1428 | * includes the time spent in suspend. | |
1429 | */ | |
1430 | void get_monotonic_boottime(struct timespec *ts) | |
1431 | { | |
4e250fdd | 1432 | struct timekeeper *tk = &timekeeper; |
abb3a4ea | 1433 | struct timespec tomono, sleep; |
ec145bab | 1434 | s64 nsec; |
abb3a4ea | 1435 | unsigned int seq; |
abb3a4ea JS |
1436 | |
1437 | WARN_ON(timekeeping_suspended); | |
1438 | ||
1439 | do { | |
9a7a71b1 | 1440 | seq = read_seqcount_begin(&timekeeper_seq); |
4e250fdd | 1441 | ts->tv_sec = tk->xtime_sec; |
ec145bab | 1442 | nsec = timekeeping_get_ns(tk); |
4e250fdd JS |
1443 | tomono = tk->wall_to_monotonic; |
1444 | sleep = tk->total_sleep_time; | |
abb3a4ea | 1445 | |
9a7a71b1 | 1446 | } while (read_seqcount_retry(&timekeeper_seq, seq)); |
abb3a4ea | 1447 | |
ec145bab JS |
1448 | ts->tv_sec += tomono.tv_sec + sleep.tv_sec; |
1449 | ts->tv_nsec = 0; | |
1450 | timespec_add_ns(ts, nsec + tomono.tv_nsec + sleep.tv_nsec); | |
abb3a4ea JS |
1451 | } |
1452 | EXPORT_SYMBOL_GPL(get_monotonic_boottime); | |
1453 | ||
1454 | /** | |
1455 | * ktime_get_boottime - Returns monotonic time since boot in a ktime | |
1456 | * | |
1457 | * Returns the monotonic time since boot in a ktime | |
1458 | * | |
1459 | * This is similar to CLOCK_MONTONIC/ktime_get, but also | |
1460 | * includes the time spent in suspend. | |
1461 | */ | |
1462 | ktime_t ktime_get_boottime(void) | |
1463 | { | |
1464 | struct timespec ts; | |
1465 | ||
1466 | get_monotonic_boottime(&ts); | |
1467 | return timespec_to_ktime(ts); | |
1468 | } | |
1469 | EXPORT_SYMBOL_GPL(ktime_get_boottime); | |
1470 | ||
7c3f1a57 TJ |
1471 | /** |
1472 | * monotonic_to_bootbased - Convert the monotonic time to boot based. | |
1473 | * @ts: pointer to the timespec to be converted | |
1474 | */ | |
1475 | void monotonic_to_bootbased(struct timespec *ts) | |
1476 | { | |
4e250fdd JS |
1477 | struct timekeeper *tk = &timekeeper; |
1478 | ||
1479 | *ts = timespec_add(*ts, tk->total_sleep_time); | |
7c3f1a57 | 1480 | } |
c93d89f3 | 1481 | EXPORT_SYMBOL_GPL(monotonic_to_bootbased); |
2c6b47de | 1482 | |
17c38b74 JS |
1483 | unsigned long get_seconds(void) |
1484 | { | |
4e250fdd JS |
1485 | struct timekeeper *tk = &timekeeper; |
1486 | ||
1487 | return tk->xtime_sec; | |
17c38b74 JS |
1488 | } |
1489 | EXPORT_SYMBOL(get_seconds); | |
1490 | ||
da15cfda JS |
1491 | struct timespec __current_kernel_time(void) |
1492 | { | |
4e250fdd JS |
1493 | struct timekeeper *tk = &timekeeper; |
1494 | ||
1495 | return tk_xtime(tk); | |
da15cfda | 1496 | } |
17c38b74 | 1497 | |
2c6b47de JS |
1498 | struct timespec current_kernel_time(void) |
1499 | { | |
4e250fdd | 1500 | struct timekeeper *tk = &timekeeper; |
2c6b47de JS |
1501 | struct timespec now; |
1502 | unsigned long seq; | |
1503 | ||
1504 | do { | |
9a7a71b1 | 1505 | seq = read_seqcount_begin(&timekeeper_seq); |
83f57a11 | 1506 | |
4e250fdd | 1507 | now = tk_xtime(tk); |
9a7a71b1 | 1508 | } while (read_seqcount_retry(&timekeeper_seq, seq)); |
2c6b47de JS |
1509 | |
1510 | return now; | |
1511 | } | |
2c6b47de | 1512 | EXPORT_SYMBOL(current_kernel_time); |
da15cfda JS |
1513 | |
1514 | struct timespec get_monotonic_coarse(void) | |
1515 | { | |
4e250fdd | 1516 | struct timekeeper *tk = &timekeeper; |
da15cfda JS |
1517 | struct timespec now, mono; |
1518 | unsigned long seq; | |
1519 | ||
1520 | do { | |
9a7a71b1 | 1521 | seq = read_seqcount_begin(&timekeeper_seq); |
83f57a11 | 1522 | |
4e250fdd JS |
1523 | now = tk_xtime(tk); |
1524 | mono = tk->wall_to_monotonic; | |
9a7a71b1 | 1525 | } while (read_seqcount_retry(&timekeeper_seq, seq)); |
da15cfda JS |
1526 | |
1527 | set_normalized_timespec(&now, now.tv_sec + mono.tv_sec, | |
1528 | now.tv_nsec + mono.tv_nsec); | |
1529 | return now; | |
1530 | } | |
871cf1e5 TH |
1531 | |
1532 | /* | |
d6ad4187 | 1533 | * Must hold jiffies_lock |
871cf1e5 TH |
1534 | */ |
1535 | void do_timer(unsigned long ticks) | |
1536 | { | |
1537 | jiffies_64 += ticks; | |
1538 | update_wall_time(); | |
1539 | calc_global_load(ticks); | |
1540 | } | |
48cf76f7 TH |
1541 | |
1542 | /** | |
314ac371 JS |
1543 | * get_xtime_and_monotonic_and_sleep_offset() - get xtime, wall_to_monotonic, |
1544 | * and sleep offsets. | |
48cf76f7 TH |
1545 | * @xtim: pointer to timespec to be set with xtime |
1546 | * @wtom: pointer to timespec to be set with wall_to_monotonic | |
314ac371 | 1547 | * @sleep: pointer to timespec to be set with time in suspend |
48cf76f7 | 1548 | */ |
314ac371 JS |
1549 | void get_xtime_and_monotonic_and_sleep_offset(struct timespec *xtim, |
1550 | struct timespec *wtom, struct timespec *sleep) | |
48cf76f7 | 1551 | { |
4e250fdd | 1552 | struct timekeeper *tk = &timekeeper; |
48cf76f7 TH |
1553 | unsigned long seq; |
1554 | ||
1555 | do { | |
9a7a71b1 | 1556 | seq = read_seqcount_begin(&timekeeper_seq); |
4e250fdd JS |
1557 | *xtim = tk_xtime(tk); |
1558 | *wtom = tk->wall_to_monotonic; | |
1559 | *sleep = tk->total_sleep_time; | |
9a7a71b1 | 1560 | } while (read_seqcount_retry(&timekeeper_seq, seq)); |
48cf76f7 | 1561 | } |
f0af911a | 1562 | |
f6c06abf TG |
1563 | #ifdef CONFIG_HIGH_RES_TIMERS |
1564 | /** | |
1565 | * ktime_get_update_offsets - hrtimer helper | |
1566 | * @offs_real: pointer to storage for monotonic -> realtime offset | |
1567 | * @offs_boot: pointer to storage for monotonic -> boottime offset | |
1568 | * | |
1569 | * Returns current monotonic time and updates the offsets | |
1570 | * Called from hrtimer_interupt() or retrigger_next_event() | |
1571 | */ | |
90adda98 JS |
1572 | ktime_t ktime_get_update_offsets(ktime_t *offs_real, ktime_t *offs_boot, |
1573 | ktime_t *offs_tai) | |
f6c06abf | 1574 | { |
4e250fdd | 1575 | struct timekeeper *tk = &timekeeper; |
f6c06abf TG |
1576 | ktime_t now; |
1577 | unsigned int seq; | |
1578 | u64 secs, nsecs; | |
1579 | ||
1580 | do { | |
9a7a71b1 | 1581 | seq = read_seqcount_begin(&timekeeper_seq); |
f6c06abf | 1582 | |
4e250fdd JS |
1583 | secs = tk->xtime_sec; |
1584 | nsecs = timekeeping_get_ns(tk); | |
f6c06abf | 1585 | |
4e250fdd JS |
1586 | *offs_real = tk->offs_real; |
1587 | *offs_boot = tk->offs_boot; | |
90adda98 | 1588 | *offs_tai = tk->offs_tai; |
9a7a71b1 | 1589 | } while (read_seqcount_retry(&timekeeper_seq, seq)); |
f6c06abf TG |
1590 | |
1591 | now = ktime_add_ns(ktime_set(secs, 0), nsecs); | |
1592 | now = ktime_sub(now, *offs_real); | |
1593 | return now; | |
1594 | } | |
1595 | #endif | |
1596 | ||
99ee5315 TG |
1597 | /** |
1598 | * ktime_get_monotonic_offset() - get wall_to_monotonic in ktime_t format | |
1599 | */ | |
1600 | ktime_t ktime_get_monotonic_offset(void) | |
1601 | { | |
4e250fdd | 1602 | struct timekeeper *tk = &timekeeper; |
99ee5315 TG |
1603 | unsigned long seq; |
1604 | struct timespec wtom; | |
1605 | ||
1606 | do { | |
9a7a71b1 | 1607 | seq = read_seqcount_begin(&timekeeper_seq); |
4e250fdd | 1608 | wtom = tk->wall_to_monotonic; |
9a7a71b1 | 1609 | } while (read_seqcount_retry(&timekeeper_seq, seq)); |
70471f2f | 1610 | |
99ee5315 TG |
1611 | return timespec_to_ktime(wtom); |
1612 | } | |
a80b83b7 JS |
1613 | EXPORT_SYMBOL_GPL(ktime_get_monotonic_offset); |
1614 | ||
f0af911a TH |
1615 | /** |
1616 | * xtime_update() - advances the timekeeping infrastructure | |
1617 | * @ticks: number of ticks, that have elapsed since the last call. | |
1618 | * | |
1619 | * Must be called with interrupts disabled. | |
1620 | */ | |
1621 | void xtime_update(unsigned long ticks) | |
1622 | { | |
d6ad4187 | 1623 | write_seqlock(&jiffies_lock); |
f0af911a | 1624 | do_timer(ticks); |
d6ad4187 | 1625 | write_sequnlock(&jiffies_lock); |
f0af911a | 1626 | } |