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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" |
aa6f9c59 | 27 | #include "ntp_internal.h" |
155ec602 | 28 | |
afa14e7c | 29 | static struct timekeeper timekeeper; |
9a7a71b1 TG |
30 | static DEFINE_RAW_SPINLOCK(timekeeper_lock); |
31 | static seqcount_t timekeeper_seq; | |
155ec602 | 32 | |
8fcce546 JS |
33 | /* flag for if timekeeping is suspended */ |
34 | int __read_mostly timekeeping_suspended; | |
35 | ||
31ade306 FT |
36 | /* Flag for if there is a persistent clock on this platform */ |
37 | bool __read_mostly persistent_clock_exist = false; | |
38 | ||
1e75fa8b JS |
39 | static inline void tk_normalize_xtime(struct timekeeper *tk) |
40 | { | |
41 | while (tk->xtime_nsec >= ((u64)NSEC_PER_SEC << tk->shift)) { | |
42 | tk->xtime_nsec -= (u64)NSEC_PER_SEC << tk->shift; | |
43 | tk->xtime_sec++; | |
44 | } | |
45 | } | |
46 | ||
1e75fa8b JS |
47 | static void tk_set_xtime(struct timekeeper *tk, const struct timespec *ts) |
48 | { | |
49 | tk->xtime_sec = ts->tv_sec; | |
b44d50dc | 50 | tk->xtime_nsec = (u64)ts->tv_nsec << tk->shift; |
1e75fa8b JS |
51 | } |
52 | ||
53 | static void tk_xtime_add(struct timekeeper *tk, const struct timespec *ts) | |
54 | { | |
55 | tk->xtime_sec += ts->tv_sec; | |
b44d50dc | 56 | tk->xtime_nsec += (u64)ts->tv_nsec << tk->shift; |
784ffcbb | 57 | tk_normalize_xtime(tk); |
1e75fa8b | 58 | } |
8fcce546 | 59 | |
6d0ef903 JS |
60 | static void tk_set_wall_to_mono(struct timekeeper *tk, struct timespec wtm) |
61 | { | |
62 | struct timespec tmp; | |
63 | ||
64 | /* | |
65 | * Verify consistency of: offset_real = -wall_to_monotonic | |
66 | * before modifying anything | |
67 | */ | |
68 | set_normalized_timespec(&tmp, -tk->wall_to_monotonic.tv_sec, | |
69 | -tk->wall_to_monotonic.tv_nsec); | |
70 | WARN_ON_ONCE(tk->offs_real.tv64 != timespec_to_ktime(tmp).tv64); | |
71 | tk->wall_to_monotonic = wtm; | |
72 | set_normalized_timespec(&tmp, -wtm.tv_sec, -wtm.tv_nsec); | |
73 | tk->offs_real = timespec_to_ktime(tmp); | |
90adda98 | 74 | tk->offs_tai = ktime_sub(tk->offs_real, ktime_set(tk->tai_offset, 0)); |
6d0ef903 JS |
75 | } |
76 | ||
77 | static void tk_set_sleep_time(struct timekeeper *tk, struct timespec t) | |
78 | { | |
79 | /* Verify consistency before modifying */ | |
80 | WARN_ON_ONCE(tk->offs_boot.tv64 != timespec_to_ktime(tk->total_sleep_time).tv64); | |
81 | ||
82 | tk->total_sleep_time = t; | |
83 | tk->offs_boot = timespec_to_ktime(t); | |
84 | } | |
85 | ||
155ec602 MS |
86 | /** |
87 | * timekeeper_setup_internals - Set up internals to use clocksource clock. | |
88 | * | |
89 | * @clock: Pointer to clocksource. | |
90 | * | |
91 | * Calculates a fixed cycle/nsec interval for a given clocksource/adjustment | |
92 | * pair and interval request. | |
93 | * | |
94 | * Unless you're the timekeeping code, you should not be using this! | |
95 | */ | |
f726a697 | 96 | static void tk_setup_internals(struct timekeeper *tk, struct clocksource *clock) |
155ec602 MS |
97 | { |
98 | cycle_t interval; | |
a386b5af | 99 | u64 tmp, ntpinterval; |
1e75fa8b | 100 | struct clocksource *old_clock; |
155ec602 | 101 | |
f726a697 JS |
102 | old_clock = tk->clock; |
103 | tk->clock = clock; | |
155ec602 MS |
104 | clock->cycle_last = clock->read(clock); |
105 | ||
106 | /* Do the ns -> cycle conversion first, using original mult */ | |
107 | tmp = NTP_INTERVAL_LENGTH; | |
108 | tmp <<= clock->shift; | |
a386b5af | 109 | ntpinterval = tmp; |
0a544198 MS |
110 | tmp += clock->mult/2; |
111 | do_div(tmp, clock->mult); | |
155ec602 MS |
112 | if (tmp == 0) |
113 | tmp = 1; | |
114 | ||
115 | interval = (cycle_t) tmp; | |
f726a697 | 116 | tk->cycle_interval = interval; |
155ec602 MS |
117 | |
118 | /* Go back from cycles -> shifted ns */ | |
f726a697 JS |
119 | tk->xtime_interval = (u64) interval * clock->mult; |
120 | tk->xtime_remainder = ntpinterval - tk->xtime_interval; | |
121 | tk->raw_interval = | |
0a544198 | 122 | ((u64) interval * clock->mult) >> clock->shift; |
155ec602 | 123 | |
1e75fa8b JS |
124 | /* if changing clocks, convert xtime_nsec shift units */ |
125 | if (old_clock) { | |
126 | int shift_change = clock->shift - old_clock->shift; | |
127 | if (shift_change < 0) | |
f726a697 | 128 | tk->xtime_nsec >>= -shift_change; |
1e75fa8b | 129 | else |
f726a697 | 130 | tk->xtime_nsec <<= shift_change; |
1e75fa8b | 131 | } |
f726a697 | 132 | tk->shift = clock->shift; |
155ec602 | 133 | |
f726a697 JS |
134 | tk->ntp_error = 0; |
135 | tk->ntp_error_shift = NTP_SCALE_SHIFT - clock->shift; | |
0a544198 MS |
136 | |
137 | /* | |
138 | * The timekeeper keeps its own mult values for the currently | |
139 | * active clocksource. These value will be adjusted via NTP | |
140 | * to counteract clock drifting. | |
141 | */ | |
f726a697 | 142 | tk->mult = clock->mult; |
155ec602 | 143 | } |
8524070b | 144 | |
2ba2a305 | 145 | /* Timekeeper helper functions. */ |
7b1f6207 SW |
146 | |
147 | #ifdef CONFIG_ARCH_USES_GETTIMEOFFSET | |
148 | u32 (*arch_gettimeoffset)(void); | |
149 | ||
150 | u32 get_arch_timeoffset(void) | |
151 | { | |
152 | if (likely(arch_gettimeoffset)) | |
153 | return arch_gettimeoffset(); | |
154 | return 0; | |
155 | } | |
156 | #else | |
157 | static inline u32 get_arch_timeoffset(void) { return 0; } | |
158 | #endif | |
159 | ||
f726a697 | 160 | static inline s64 timekeeping_get_ns(struct timekeeper *tk) |
2ba2a305 MS |
161 | { |
162 | cycle_t cycle_now, cycle_delta; | |
163 | struct clocksource *clock; | |
1e75fa8b | 164 | s64 nsec; |
2ba2a305 MS |
165 | |
166 | /* read clocksource: */ | |
f726a697 | 167 | clock = tk->clock; |
2ba2a305 MS |
168 | cycle_now = clock->read(clock); |
169 | ||
170 | /* calculate the delta since the last update_wall_time: */ | |
171 | cycle_delta = (cycle_now - clock->cycle_last) & clock->mask; | |
172 | ||
f726a697 JS |
173 | nsec = cycle_delta * tk->mult + tk->xtime_nsec; |
174 | nsec >>= tk->shift; | |
f2a5a085 | 175 | |
7b1f6207 SW |
176 | /* If arch requires, add in get_arch_timeoffset() */ |
177 | return nsec + get_arch_timeoffset(); | |
2ba2a305 MS |
178 | } |
179 | ||
f726a697 | 180 | static inline s64 timekeeping_get_ns_raw(struct timekeeper *tk) |
2ba2a305 MS |
181 | { |
182 | cycle_t cycle_now, cycle_delta; | |
183 | struct clocksource *clock; | |
f2a5a085 | 184 | s64 nsec; |
2ba2a305 MS |
185 | |
186 | /* read clocksource: */ | |
f726a697 | 187 | clock = tk->clock; |
2ba2a305 MS |
188 | cycle_now = clock->read(clock); |
189 | ||
190 | /* calculate the delta since the last update_wall_time: */ | |
191 | cycle_delta = (cycle_now - clock->cycle_last) & clock->mask; | |
192 | ||
f2a5a085 JS |
193 | /* convert delta to nanoseconds. */ |
194 | nsec = clocksource_cyc2ns(cycle_delta, clock->mult, clock->shift); | |
195 | ||
7b1f6207 SW |
196 | /* If arch requires, add in get_arch_timeoffset() */ |
197 | return nsec + get_arch_timeoffset(); | |
2ba2a305 MS |
198 | } |
199 | ||
e0b306fe MT |
200 | static RAW_NOTIFIER_HEAD(pvclock_gtod_chain); |
201 | ||
202 | static void update_pvclock_gtod(struct timekeeper *tk) | |
203 | { | |
204 | raw_notifier_call_chain(&pvclock_gtod_chain, 0, tk); | |
205 | } | |
206 | ||
207 | /** | |
208 | * pvclock_gtod_register_notifier - register a pvclock timedata update listener | |
e0b306fe MT |
209 | */ |
210 | int pvclock_gtod_register_notifier(struct notifier_block *nb) | |
211 | { | |
212 | struct timekeeper *tk = &timekeeper; | |
213 | unsigned long flags; | |
214 | int ret; | |
215 | ||
9a7a71b1 | 216 | raw_spin_lock_irqsave(&timekeeper_lock, flags); |
e0b306fe | 217 | ret = raw_notifier_chain_register(&pvclock_gtod_chain, nb); |
e0b306fe | 218 | update_pvclock_gtod(tk); |
9a7a71b1 | 219 | raw_spin_unlock_irqrestore(&timekeeper_lock, flags); |
e0b306fe MT |
220 | |
221 | return ret; | |
222 | } | |
223 | EXPORT_SYMBOL_GPL(pvclock_gtod_register_notifier); | |
224 | ||
225 | /** | |
226 | * pvclock_gtod_unregister_notifier - unregister a pvclock | |
227 | * timedata update listener | |
e0b306fe MT |
228 | */ |
229 | int pvclock_gtod_unregister_notifier(struct notifier_block *nb) | |
230 | { | |
e0b306fe MT |
231 | unsigned long flags; |
232 | int ret; | |
233 | ||
9a7a71b1 | 234 | raw_spin_lock_irqsave(&timekeeper_lock, flags); |
e0b306fe | 235 | ret = raw_notifier_chain_unregister(&pvclock_gtod_chain, nb); |
9a7a71b1 | 236 | raw_spin_unlock_irqrestore(&timekeeper_lock, flags); |
e0b306fe MT |
237 | |
238 | return ret; | |
239 | } | |
240 | EXPORT_SYMBOL_GPL(pvclock_gtod_unregister_notifier); | |
241 | ||
9a7a71b1 | 242 | /* must hold timekeeper_lock */ |
f726a697 | 243 | static void timekeeping_update(struct timekeeper *tk, bool clearntp) |
cc06268c TG |
244 | { |
245 | if (clearntp) { | |
f726a697 | 246 | tk->ntp_error = 0; |
cc06268c TG |
247 | ntp_clear(); |
248 | } | |
576094b7 | 249 | update_vsyscall(tk); |
e0b306fe | 250 | update_pvclock_gtod(tk); |
cc06268c TG |
251 | } |
252 | ||
8524070b | 253 | /** |
155ec602 | 254 | * timekeeping_forward_now - update clock to the current time |
8524070b | 255 | * |
9a055117 RZ |
256 | * Forward the current clock to update its state since the last call to |
257 | * update_wall_time(). This is useful before significant clock changes, | |
258 | * as it avoids having to deal with this time offset explicitly. | |
8524070b | 259 | */ |
f726a697 | 260 | static void timekeeping_forward_now(struct timekeeper *tk) |
8524070b JS |
261 | { |
262 | cycle_t cycle_now, cycle_delta; | |
155ec602 | 263 | struct clocksource *clock; |
9a055117 | 264 | s64 nsec; |
8524070b | 265 | |
f726a697 | 266 | clock = tk->clock; |
a0f7d48b | 267 | cycle_now = clock->read(clock); |
8524070b | 268 | cycle_delta = (cycle_now - clock->cycle_last) & clock->mask; |
9a055117 | 269 | clock->cycle_last = cycle_now; |
8524070b | 270 | |
f726a697 | 271 | tk->xtime_nsec += cycle_delta * tk->mult; |
7d27558c | 272 | |
7b1f6207 SW |
273 | /* If arch requires, add in get_arch_timeoffset() */ |
274 | tk->xtime_nsec += (u64)get_arch_timeoffset() << tk->shift; | |
7d27558c | 275 | |
f726a697 | 276 | tk_normalize_xtime(tk); |
2d42244a | 277 | |
0a544198 | 278 | nsec = clocksource_cyc2ns(cycle_delta, clock->mult, clock->shift); |
f726a697 | 279 | timespec_add_ns(&tk->raw_time, nsec); |
8524070b JS |
280 | } |
281 | ||
282 | /** | |
1e817fb6 | 283 | * __getnstimeofday - Returns the time of day in a timespec. |
8524070b JS |
284 | * @ts: pointer to the timespec to be set |
285 | * | |
1e817fb6 KC |
286 | * Updates the time of day in the timespec. |
287 | * Returns 0 on success, or -ve when suspended (timespec will be undefined). | |
8524070b | 288 | */ |
1e817fb6 | 289 | int __getnstimeofday(struct timespec *ts) |
8524070b | 290 | { |
4e250fdd | 291 | struct timekeeper *tk = &timekeeper; |
8524070b | 292 | unsigned long seq; |
1e75fa8b | 293 | s64 nsecs = 0; |
8524070b JS |
294 | |
295 | do { | |
9a7a71b1 | 296 | seq = read_seqcount_begin(&timekeeper_seq); |
8524070b | 297 | |
4e250fdd | 298 | ts->tv_sec = tk->xtime_sec; |
ec145bab | 299 | nsecs = timekeeping_get_ns(tk); |
8524070b | 300 | |
9a7a71b1 | 301 | } while (read_seqcount_retry(&timekeeper_seq, seq)); |
8524070b | 302 | |
ec145bab | 303 | ts->tv_nsec = 0; |
8524070b | 304 | timespec_add_ns(ts, nsecs); |
1e817fb6 KC |
305 | |
306 | /* | |
307 | * Do not bail out early, in case there were callers still using | |
308 | * the value, even in the face of the WARN_ON. | |
309 | */ | |
310 | if (unlikely(timekeeping_suspended)) | |
311 | return -EAGAIN; | |
312 | return 0; | |
313 | } | |
314 | EXPORT_SYMBOL(__getnstimeofday); | |
315 | ||
316 | /** | |
317 | * getnstimeofday - Returns the time of day in a timespec. | |
318 | * @ts: pointer to the timespec to be set | |
319 | * | |
320 | * Returns the time of day in a timespec (WARN if suspended). | |
321 | */ | |
322 | void getnstimeofday(struct timespec *ts) | |
323 | { | |
324 | WARN_ON(__getnstimeofday(ts)); | |
8524070b | 325 | } |
8524070b JS |
326 | EXPORT_SYMBOL(getnstimeofday); |
327 | ||
951ed4d3 MS |
328 | ktime_t ktime_get(void) |
329 | { | |
4e250fdd | 330 | struct timekeeper *tk = &timekeeper; |
951ed4d3 MS |
331 | unsigned int seq; |
332 | s64 secs, nsecs; | |
333 | ||
334 | WARN_ON(timekeeping_suspended); | |
335 | ||
336 | do { | |
9a7a71b1 | 337 | seq = read_seqcount_begin(&timekeeper_seq); |
4e250fdd JS |
338 | secs = tk->xtime_sec + tk->wall_to_monotonic.tv_sec; |
339 | nsecs = timekeeping_get_ns(tk) + tk->wall_to_monotonic.tv_nsec; | |
951ed4d3 | 340 | |
9a7a71b1 | 341 | } while (read_seqcount_retry(&timekeeper_seq, seq)); |
951ed4d3 MS |
342 | /* |
343 | * Use ktime_set/ktime_add_ns to create a proper ktime on | |
344 | * 32-bit architectures without CONFIG_KTIME_SCALAR. | |
345 | */ | |
346 | return ktime_add_ns(ktime_set(secs, 0), nsecs); | |
347 | } | |
348 | EXPORT_SYMBOL_GPL(ktime_get); | |
349 | ||
350 | /** | |
351 | * ktime_get_ts - get the monotonic clock in timespec format | |
352 | * @ts: pointer to timespec variable | |
353 | * | |
354 | * The function calculates the monotonic clock from the realtime | |
355 | * clock and the wall_to_monotonic offset and stores the result | |
356 | * in normalized timespec format in the variable pointed to by @ts. | |
357 | */ | |
358 | void ktime_get_ts(struct timespec *ts) | |
359 | { | |
4e250fdd | 360 | struct timekeeper *tk = &timekeeper; |
951ed4d3 | 361 | struct timespec tomono; |
ec145bab | 362 | s64 nsec; |
951ed4d3 | 363 | unsigned int seq; |
951ed4d3 MS |
364 | |
365 | WARN_ON(timekeeping_suspended); | |
366 | ||
367 | do { | |
9a7a71b1 | 368 | seq = read_seqcount_begin(&timekeeper_seq); |
4e250fdd | 369 | ts->tv_sec = tk->xtime_sec; |
ec145bab | 370 | nsec = timekeeping_get_ns(tk); |
4e250fdd | 371 | tomono = tk->wall_to_monotonic; |
951ed4d3 | 372 | |
9a7a71b1 | 373 | } while (read_seqcount_retry(&timekeeper_seq, seq)); |
951ed4d3 | 374 | |
ec145bab JS |
375 | ts->tv_sec += tomono.tv_sec; |
376 | ts->tv_nsec = 0; | |
377 | timespec_add_ns(ts, nsec + tomono.tv_nsec); | |
951ed4d3 MS |
378 | } |
379 | EXPORT_SYMBOL_GPL(ktime_get_ts); | |
380 | ||
1ff3c967 JS |
381 | |
382 | /** | |
383 | * timekeeping_clocktai - Returns the TAI time of day in a timespec | |
384 | * @ts: pointer to the timespec to be set | |
385 | * | |
386 | * Returns the time of day in a timespec. | |
387 | */ | |
388 | void timekeeping_clocktai(struct timespec *ts) | |
389 | { | |
390 | struct timekeeper *tk = &timekeeper; | |
391 | unsigned long seq; | |
392 | u64 nsecs; | |
393 | ||
394 | WARN_ON(timekeeping_suspended); | |
395 | ||
396 | do { | |
9a7a71b1 | 397 | seq = read_seqcount_begin(&timekeeper_seq); |
1ff3c967 JS |
398 | |
399 | ts->tv_sec = tk->xtime_sec + tk->tai_offset; | |
400 | nsecs = timekeeping_get_ns(tk); | |
401 | ||
9a7a71b1 | 402 | } while (read_seqcount_retry(&timekeeper_seq, seq)); |
1ff3c967 JS |
403 | |
404 | ts->tv_nsec = 0; | |
405 | timespec_add_ns(ts, nsecs); | |
406 | ||
407 | } | |
408 | EXPORT_SYMBOL(timekeeping_clocktai); | |
409 | ||
410 | ||
90adda98 JS |
411 | /** |
412 | * ktime_get_clocktai - Returns the TAI time of day in a ktime | |
413 | * | |
414 | * Returns the time of day in a ktime. | |
415 | */ | |
416 | ktime_t ktime_get_clocktai(void) | |
417 | { | |
418 | struct timespec ts; | |
419 | ||
420 | timekeeping_clocktai(&ts); | |
421 | return timespec_to_ktime(ts); | |
422 | } | |
423 | EXPORT_SYMBOL(ktime_get_clocktai); | |
424 | ||
e2c18e49 AG |
425 | #ifdef CONFIG_NTP_PPS |
426 | ||
427 | /** | |
428 | * getnstime_raw_and_real - get day and raw monotonic time in timespec format | |
429 | * @ts_raw: pointer to the timespec to be set to raw monotonic time | |
430 | * @ts_real: pointer to the timespec to be set to the time of day | |
431 | * | |
432 | * This function reads both the time of day and raw monotonic time at the | |
433 | * same time atomically and stores the resulting timestamps in timespec | |
434 | * format. | |
435 | */ | |
436 | void getnstime_raw_and_real(struct timespec *ts_raw, struct timespec *ts_real) | |
437 | { | |
4e250fdd | 438 | struct timekeeper *tk = &timekeeper; |
e2c18e49 AG |
439 | unsigned long seq; |
440 | s64 nsecs_raw, nsecs_real; | |
441 | ||
442 | WARN_ON_ONCE(timekeeping_suspended); | |
443 | ||
444 | do { | |
9a7a71b1 | 445 | seq = read_seqcount_begin(&timekeeper_seq); |
e2c18e49 | 446 | |
4e250fdd JS |
447 | *ts_raw = tk->raw_time; |
448 | ts_real->tv_sec = tk->xtime_sec; | |
1e75fa8b | 449 | ts_real->tv_nsec = 0; |
e2c18e49 | 450 | |
4e250fdd JS |
451 | nsecs_raw = timekeeping_get_ns_raw(tk); |
452 | nsecs_real = timekeeping_get_ns(tk); | |
e2c18e49 | 453 | |
9a7a71b1 | 454 | } while (read_seqcount_retry(&timekeeper_seq, seq)); |
e2c18e49 AG |
455 | |
456 | timespec_add_ns(ts_raw, nsecs_raw); | |
457 | timespec_add_ns(ts_real, nsecs_real); | |
458 | } | |
459 | EXPORT_SYMBOL(getnstime_raw_and_real); | |
460 | ||
461 | #endif /* CONFIG_NTP_PPS */ | |
462 | ||
8524070b JS |
463 | /** |
464 | * do_gettimeofday - Returns the time of day in a timeval | |
465 | * @tv: pointer to the timeval to be set | |
466 | * | |
efd9ac86 | 467 | * NOTE: Users should be converted to using getnstimeofday() |
8524070b JS |
468 | */ |
469 | void do_gettimeofday(struct timeval *tv) | |
470 | { | |
471 | struct timespec now; | |
472 | ||
efd9ac86 | 473 | getnstimeofday(&now); |
8524070b JS |
474 | tv->tv_sec = now.tv_sec; |
475 | tv->tv_usec = now.tv_nsec/1000; | |
476 | } | |
8524070b | 477 | EXPORT_SYMBOL(do_gettimeofday); |
d239f49d | 478 | |
8524070b JS |
479 | /** |
480 | * do_settimeofday - Sets the time of day | |
481 | * @tv: pointer to the timespec variable containing the new time | |
482 | * | |
483 | * Sets the time of day to the new time and update NTP and notify hrtimers | |
484 | */ | |
1e6d7679 | 485 | int do_settimeofday(const struct timespec *tv) |
8524070b | 486 | { |
4e250fdd | 487 | struct timekeeper *tk = &timekeeper; |
1e75fa8b | 488 | struct timespec ts_delta, xt; |
92c1d3ed | 489 | unsigned long flags; |
8524070b | 490 | |
cee58483 | 491 | if (!timespec_valid_strict(tv)) |
8524070b JS |
492 | return -EINVAL; |
493 | ||
9a7a71b1 TG |
494 | raw_spin_lock_irqsave(&timekeeper_lock, flags); |
495 | write_seqcount_begin(&timekeeper_seq); | |
8524070b | 496 | |
4e250fdd | 497 | timekeeping_forward_now(tk); |
9a055117 | 498 | |
4e250fdd | 499 | xt = tk_xtime(tk); |
1e75fa8b JS |
500 | ts_delta.tv_sec = tv->tv_sec - xt.tv_sec; |
501 | ts_delta.tv_nsec = tv->tv_nsec - xt.tv_nsec; | |
502 | ||
4e250fdd | 503 | tk_set_wall_to_mono(tk, timespec_sub(tk->wall_to_monotonic, ts_delta)); |
8524070b | 504 | |
4e250fdd | 505 | tk_set_xtime(tk, tv); |
1e75fa8b | 506 | |
4e250fdd | 507 | timekeeping_update(tk, true); |
8524070b | 508 | |
9a7a71b1 TG |
509 | write_seqcount_end(&timekeeper_seq); |
510 | raw_spin_unlock_irqrestore(&timekeeper_lock, flags); | |
8524070b JS |
511 | |
512 | /* signal hrtimers about time change */ | |
513 | clock_was_set(); | |
514 | ||
515 | return 0; | |
516 | } | |
8524070b JS |
517 | EXPORT_SYMBOL(do_settimeofday); |
518 | ||
c528f7c6 JS |
519 | /** |
520 | * timekeeping_inject_offset - Adds or subtracts from the current time. | |
521 | * @tv: pointer to the timespec variable containing the offset | |
522 | * | |
523 | * Adds or subtracts an offset value from the current time. | |
524 | */ | |
525 | int timekeeping_inject_offset(struct timespec *ts) | |
526 | { | |
4e250fdd | 527 | struct timekeeper *tk = &timekeeper; |
92c1d3ed | 528 | unsigned long flags; |
4e8b1452 JS |
529 | struct timespec tmp; |
530 | int ret = 0; | |
c528f7c6 JS |
531 | |
532 | if ((unsigned long)ts->tv_nsec >= NSEC_PER_SEC) | |
533 | return -EINVAL; | |
534 | ||
9a7a71b1 TG |
535 | raw_spin_lock_irqsave(&timekeeper_lock, flags); |
536 | write_seqcount_begin(&timekeeper_seq); | |
c528f7c6 | 537 | |
4e250fdd | 538 | timekeeping_forward_now(tk); |
c528f7c6 | 539 | |
4e8b1452 JS |
540 | /* Make sure the proposed value is valid */ |
541 | tmp = timespec_add(tk_xtime(tk), *ts); | |
cee58483 | 542 | if (!timespec_valid_strict(&tmp)) { |
4e8b1452 JS |
543 | ret = -EINVAL; |
544 | goto error; | |
545 | } | |
1e75fa8b | 546 | |
4e250fdd JS |
547 | tk_xtime_add(tk, ts); |
548 | tk_set_wall_to_mono(tk, timespec_sub(tk->wall_to_monotonic, *ts)); | |
c528f7c6 | 549 | |
4e8b1452 | 550 | error: /* even if we error out, we forwarded the time, so call update */ |
4e250fdd | 551 | timekeeping_update(tk, true); |
c528f7c6 | 552 | |
9a7a71b1 TG |
553 | write_seqcount_end(&timekeeper_seq); |
554 | raw_spin_unlock_irqrestore(&timekeeper_lock, flags); | |
c528f7c6 JS |
555 | |
556 | /* signal hrtimers about time change */ | |
557 | clock_was_set(); | |
558 | ||
4e8b1452 | 559 | return ret; |
c528f7c6 JS |
560 | } |
561 | EXPORT_SYMBOL(timekeeping_inject_offset); | |
562 | ||
cc244dda JS |
563 | |
564 | /** | |
565 | * timekeeping_get_tai_offset - Returns current TAI offset from UTC | |
566 | * | |
567 | */ | |
568 | s32 timekeeping_get_tai_offset(void) | |
569 | { | |
570 | struct timekeeper *tk = &timekeeper; | |
571 | unsigned int seq; | |
572 | s32 ret; | |
573 | ||
574 | do { | |
9a7a71b1 | 575 | seq = read_seqcount_begin(&timekeeper_seq); |
cc244dda | 576 | ret = tk->tai_offset; |
9a7a71b1 | 577 | } while (read_seqcount_retry(&timekeeper_seq, seq)); |
cc244dda JS |
578 | |
579 | return ret; | |
580 | } | |
581 | ||
582 | /** | |
583 | * __timekeeping_set_tai_offset - Lock free worker function | |
584 | * | |
585 | */ | |
dd5d70e8 | 586 | static void __timekeeping_set_tai_offset(struct timekeeper *tk, s32 tai_offset) |
cc244dda JS |
587 | { |
588 | tk->tai_offset = tai_offset; | |
90adda98 | 589 | tk->offs_tai = ktime_sub(tk->offs_real, ktime_set(tai_offset, 0)); |
cc244dda JS |
590 | } |
591 | ||
592 | /** | |
593 | * timekeeping_set_tai_offset - Sets the current TAI offset from UTC | |
594 | * | |
595 | */ | |
596 | void timekeeping_set_tai_offset(s32 tai_offset) | |
597 | { | |
598 | struct timekeeper *tk = &timekeeper; | |
599 | unsigned long flags; | |
600 | ||
9a7a71b1 TG |
601 | raw_spin_lock_irqsave(&timekeeper_lock, flags); |
602 | write_seqcount_begin(&timekeeper_seq); | |
cc244dda | 603 | __timekeeping_set_tai_offset(tk, tai_offset); |
9a7a71b1 TG |
604 | write_seqcount_end(&timekeeper_seq); |
605 | raw_spin_unlock_irqrestore(&timekeeper_lock, flags); | |
cc244dda JS |
606 | } |
607 | ||
8524070b JS |
608 | /** |
609 | * change_clocksource - Swaps clocksources if a new one is available | |
610 | * | |
611 | * Accumulates current time interval and initializes new clocksource | |
612 | */ | |
75c5158f | 613 | static int change_clocksource(void *data) |
8524070b | 614 | { |
4e250fdd | 615 | struct timekeeper *tk = &timekeeper; |
4614e6ad | 616 | struct clocksource *new, *old; |
f695cf94 | 617 | unsigned long flags; |
8524070b | 618 | |
75c5158f | 619 | new = (struct clocksource *) data; |
8524070b | 620 | |
9a7a71b1 TG |
621 | raw_spin_lock_irqsave(&timekeeper_lock, flags); |
622 | write_seqcount_begin(&timekeeper_seq); | |
f695cf94 | 623 | |
4e250fdd | 624 | timekeeping_forward_now(tk); |
75c5158f | 625 | if (!new->enable || new->enable(new) == 0) { |
4e250fdd JS |
626 | old = tk->clock; |
627 | tk_setup_internals(tk, new); | |
75c5158f MS |
628 | if (old->disable) |
629 | old->disable(old); | |
630 | } | |
4e250fdd | 631 | timekeeping_update(tk, true); |
f695cf94 | 632 | |
9a7a71b1 TG |
633 | write_seqcount_end(&timekeeper_seq); |
634 | raw_spin_unlock_irqrestore(&timekeeper_lock, flags); | |
f695cf94 | 635 | |
75c5158f MS |
636 | return 0; |
637 | } | |
8524070b | 638 | |
75c5158f MS |
639 | /** |
640 | * timekeeping_notify - Install a new clock source | |
641 | * @clock: pointer to the clock source | |
642 | * | |
643 | * This function is called from clocksource.c after a new, better clock | |
644 | * source has been registered. The caller holds the clocksource_mutex. | |
645 | */ | |
646 | void timekeeping_notify(struct clocksource *clock) | |
647 | { | |
4e250fdd JS |
648 | struct timekeeper *tk = &timekeeper; |
649 | ||
650 | if (tk->clock == clock) | |
4614e6ad | 651 | return; |
75c5158f | 652 | stop_machine(change_clocksource, clock, NULL); |
8524070b | 653 | tick_clock_notify(); |
8524070b | 654 | } |
75c5158f | 655 | |
a40f262c TG |
656 | /** |
657 | * ktime_get_real - get the real (wall-) time in ktime_t format | |
658 | * | |
659 | * returns the time in ktime_t format | |
660 | */ | |
661 | ktime_t ktime_get_real(void) | |
662 | { | |
663 | struct timespec now; | |
664 | ||
665 | getnstimeofday(&now); | |
666 | ||
667 | return timespec_to_ktime(now); | |
668 | } | |
669 | EXPORT_SYMBOL_GPL(ktime_get_real); | |
8524070b | 670 | |
2d42244a JS |
671 | /** |
672 | * getrawmonotonic - Returns the raw monotonic time in a timespec | |
673 | * @ts: pointer to the timespec to be set | |
674 | * | |
675 | * Returns the raw monotonic time (completely un-modified by ntp) | |
676 | */ | |
677 | void getrawmonotonic(struct timespec *ts) | |
678 | { | |
4e250fdd | 679 | struct timekeeper *tk = &timekeeper; |
2d42244a JS |
680 | unsigned long seq; |
681 | s64 nsecs; | |
2d42244a JS |
682 | |
683 | do { | |
9a7a71b1 | 684 | seq = read_seqcount_begin(&timekeeper_seq); |
4e250fdd JS |
685 | nsecs = timekeeping_get_ns_raw(tk); |
686 | *ts = tk->raw_time; | |
2d42244a | 687 | |
9a7a71b1 | 688 | } while (read_seqcount_retry(&timekeeper_seq, seq)); |
2d42244a JS |
689 | |
690 | timespec_add_ns(ts, nsecs); | |
691 | } | |
692 | EXPORT_SYMBOL(getrawmonotonic); | |
693 | ||
8524070b | 694 | /** |
cf4fc6cb | 695 | * timekeeping_valid_for_hres - Check if timekeeping is suitable for hres |
8524070b | 696 | */ |
cf4fc6cb | 697 | int timekeeping_valid_for_hres(void) |
8524070b | 698 | { |
4e250fdd | 699 | struct timekeeper *tk = &timekeeper; |
8524070b JS |
700 | unsigned long seq; |
701 | int ret; | |
702 | ||
703 | do { | |
9a7a71b1 | 704 | seq = read_seqcount_begin(&timekeeper_seq); |
8524070b | 705 | |
4e250fdd | 706 | ret = tk->clock->flags & CLOCK_SOURCE_VALID_FOR_HRES; |
8524070b | 707 | |
9a7a71b1 | 708 | } while (read_seqcount_retry(&timekeeper_seq, seq)); |
8524070b JS |
709 | |
710 | return ret; | |
711 | } | |
712 | ||
98962465 JH |
713 | /** |
714 | * timekeeping_max_deferment - Returns max time the clocksource can be deferred | |
98962465 JH |
715 | */ |
716 | u64 timekeeping_max_deferment(void) | |
717 | { | |
4e250fdd | 718 | struct timekeeper *tk = &timekeeper; |
70471f2f JS |
719 | unsigned long seq; |
720 | u64 ret; | |
42e71e81 | 721 | |
70471f2f | 722 | do { |
9a7a71b1 | 723 | seq = read_seqcount_begin(&timekeeper_seq); |
70471f2f | 724 | |
4e250fdd | 725 | ret = tk->clock->max_idle_ns; |
70471f2f | 726 | |
9a7a71b1 | 727 | } while (read_seqcount_retry(&timekeeper_seq, seq)); |
70471f2f JS |
728 | |
729 | return ret; | |
98962465 JH |
730 | } |
731 | ||
8524070b | 732 | /** |
d4f587c6 | 733 | * read_persistent_clock - Return time from the persistent clock. |
8524070b JS |
734 | * |
735 | * Weak dummy function for arches that do not yet support it. | |
d4f587c6 MS |
736 | * Reads the time from the battery backed persistent clock. |
737 | * Returns a timespec with tv_sec=0 and tv_nsec=0 if unsupported. | |
8524070b JS |
738 | * |
739 | * XXX - Do be sure to remove it once all arches implement it. | |
740 | */ | |
d4f587c6 | 741 | void __attribute__((weak)) read_persistent_clock(struct timespec *ts) |
8524070b | 742 | { |
d4f587c6 MS |
743 | ts->tv_sec = 0; |
744 | ts->tv_nsec = 0; | |
8524070b JS |
745 | } |
746 | ||
23970e38 MS |
747 | /** |
748 | * read_boot_clock - Return time of the system start. | |
749 | * | |
750 | * Weak dummy function for arches that do not yet support it. | |
751 | * Function to read the exact time the system has been started. | |
752 | * Returns a timespec with tv_sec=0 and tv_nsec=0 if unsupported. | |
753 | * | |
754 | * XXX - Do be sure to remove it once all arches implement it. | |
755 | */ | |
756 | void __attribute__((weak)) read_boot_clock(struct timespec *ts) | |
757 | { | |
758 | ts->tv_sec = 0; | |
759 | ts->tv_nsec = 0; | |
760 | } | |
761 | ||
8524070b JS |
762 | /* |
763 | * timekeeping_init - Initializes the clocksource and common timekeeping values | |
764 | */ | |
765 | void __init timekeeping_init(void) | |
766 | { | |
4e250fdd | 767 | struct timekeeper *tk = &timekeeper; |
155ec602 | 768 | struct clocksource *clock; |
8524070b | 769 | unsigned long flags; |
6d0ef903 | 770 | struct timespec now, boot, tmp; |
d4f587c6 MS |
771 | |
772 | read_persistent_clock(&now); | |
31ade306 | 773 | |
cee58483 | 774 | if (!timespec_valid_strict(&now)) { |
4e8b1452 JS |
775 | pr_warn("WARNING: Persistent clock returned invalid value!\n" |
776 | " Check your CMOS/BIOS settings.\n"); | |
777 | now.tv_sec = 0; | |
778 | now.tv_nsec = 0; | |
31ade306 FT |
779 | } else if (now.tv_sec || now.tv_nsec) |
780 | persistent_clock_exist = true; | |
4e8b1452 | 781 | |
23970e38 | 782 | read_boot_clock(&boot); |
cee58483 | 783 | if (!timespec_valid_strict(&boot)) { |
4e8b1452 JS |
784 | pr_warn("WARNING: Boot clock returned invalid value!\n" |
785 | " Check your CMOS/BIOS settings.\n"); | |
786 | boot.tv_sec = 0; | |
787 | boot.tv_nsec = 0; | |
788 | } | |
8524070b | 789 | |
7dffa3c6 | 790 | ntp_init(); |
8524070b | 791 | |
9a7a71b1 TG |
792 | raw_spin_lock_irqsave(&timekeeper_lock, flags); |
793 | write_seqcount_begin(&timekeeper_seq); | |
f1b82746 | 794 | clock = clocksource_default_clock(); |
a0f7d48b MS |
795 | if (clock->enable) |
796 | clock->enable(clock); | |
4e250fdd | 797 | tk_setup_internals(tk, clock); |
8524070b | 798 | |
4e250fdd JS |
799 | tk_set_xtime(tk, &now); |
800 | tk->raw_time.tv_sec = 0; | |
801 | tk->raw_time.tv_nsec = 0; | |
1e75fa8b | 802 | if (boot.tv_sec == 0 && boot.tv_nsec == 0) |
4e250fdd | 803 | boot = tk_xtime(tk); |
1e75fa8b | 804 | |
6d0ef903 | 805 | set_normalized_timespec(&tmp, -boot.tv_sec, -boot.tv_nsec); |
4e250fdd | 806 | tk_set_wall_to_mono(tk, tmp); |
6d0ef903 JS |
807 | |
808 | tmp.tv_sec = 0; | |
809 | tmp.tv_nsec = 0; | |
4e250fdd | 810 | tk_set_sleep_time(tk, tmp); |
6d0ef903 | 811 | |
9a7a71b1 TG |
812 | write_seqcount_end(&timekeeper_seq); |
813 | raw_spin_unlock_irqrestore(&timekeeper_lock, flags); | |
8524070b JS |
814 | } |
815 | ||
8524070b | 816 | /* time in seconds when suspend began */ |
d4f587c6 | 817 | static struct timespec timekeeping_suspend_time; |
8524070b | 818 | |
304529b1 JS |
819 | /** |
820 | * __timekeeping_inject_sleeptime - Internal function to add sleep interval | |
821 | * @delta: pointer to a timespec delta value | |
822 | * | |
823 | * Takes a timespec offset measuring a suspend interval and properly | |
824 | * adds the sleep offset to the timekeeping variables. | |
825 | */ | |
f726a697 JS |
826 | static void __timekeeping_inject_sleeptime(struct timekeeper *tk, |
827 | struct timespec *delta) | |
304529b1 | 828 | { |
cee58483 | 829 | if (!timespec_valid_strict(delta)) { |
cbaa5152 | 830 | printk(KERN_WARNING "__timekeeping_inject_sleeptime: Invalid " |
cb5de2f8 JS |
831 | "sleep delta value!\n"); |
832 | return; | |
833 | } | |
f726a697 | 834 | tk_xtime_add(tk, delta); |
6d0ef903 JS |
835 | tk_set_wall_to_mono(tk, timespec_sub(tk->wall_to_monotonic, *delta)); |
836 | tk_set_sleep_time(tk, timespec_add(tk->total_sleep_time, *delta)); | |
304529b1 JS |
837 | } |
838 | ||
304529b1 JS |
839 | /** |
840 | * timekeeping_inject_sleeptime - Adds suspend interval to timeekeeping values | |
841 | * @delta: pointer to a timespec delta value | |
842 | * | |
843 | * This hook is for architectures that cannot support read_persistent_clock | |
844 | * because their RTC/persistent clock is only accessible when irqs are enabled. | |
845 | * | |
846 | * This function should only be called by rtc_resume(), and allows | |
847 | * a suspend offset to be injected into the timekeeping values. | |
848 | */ | |
849 | void timekeeping_inject_sleeptime(struct timespec *delta) | |
850 | { | |
4e250fdd | 851 | struct timekeeper *tk = &timekeeper; |
92c1d3ed | 852 | unsigned long flags; |
304529b1 | 853 | |
31ade306 FT |
854 | /* |
855 | * Make sure we don't set the clock twice, as timekeeping_resume() | |
856 | * already did it | |
857 | */ | |
858 | if (has_persistent_clock()) | |
304529b1 JS |
859 | return; |
860 | ||
9a7a71b1 TG |
861 | raw_spin_lock_irqsave(&timekeeper_lock, flags); |
862 | write_seqcount_begin(&timekeeper_seq); | |
70471f2f | 863 | |
4e250fdd | 864 | timekeeping_forward_now(tk); |
304529b1 | 865 | |
4e250fdd | 866 | __timekeeping_inject_sleeptime(tk, delta); |
304529b1 | 867 | |
4e250fdd | 868 | timekeeping_update(tk, true); |
304529b1 | 869 | |
9a7a71b1 TG |
870 | write_seqcount_end(&timekeeper_seq); |
871 | raw_spin_unlock_irqrestore(&timekeeper_lock, flags); | |
304529b1 JS |
872 | |
873 | /* signal hrtimers about time change */ | |
874 | clock_was_set(); | |
875 | } | |
876 | ||
8524070b JS |
877 | /** |
878 | * timekeeping_resume - Resumes the generic timekeeping subsystem. | |
8524070b JS |
879 | * |
880 | * This is for the generic clocksource timekeeping. | |
881 | * xtime/wall_to_monotonic/jiffies/etc are | |
882 | * still managed by arch specific suspend/resume code. | |
883 | */ | |
e1a85b2c | 884 | static void timekeeping_resume(void) |
8524070b | 885 | { |
4e250fdd | 886 | struct timekeeper *tk = &timekeeper; |
e445cf1c | 887 | struct clocksource *clock = tk->clock; |
92c1d3ed | 888 | unsigned long flags; |
e445cf1c FT |
889 | struct timespec ts_new, ts_delta; |
890 | cycle_t cycle_now, cycle_delta; | |
891 | bool suspendtime_found = false; | |
d4f587c6 | 892 | |
e445cf1c | 893 | read_persistent_clock(&ts_new); |
8524070b | 894 | |
adc78e6b | 895 | clockevents_resume(); |
d10ff3fb TG |
896 | clocksource_resume(); |
897 | ||
9a7a71b1 TG |
898 | raw_spin_lock_irqsave(&timekeeper_lock, flags); |
899 | write_seqcount_begin(&timekeeper_seq); | |
8524070b | 900 | |
e445cf1c FT |
901 | /* |
902 | * After system resumes, we need to calculate the suspended time and | |
903 | * compensate it for the OS time. There are 3 sources that could be | |
904 | * used: Nonstop clocksource during suspend, persistent clock and rtc | |
905 | * device. | |
906 | * | |
907 | * One specific platform may have 1 or 2 or all of them, and the | |
908 | * preference will be: | |
909 | * suspend-nonstop clocksource -> persistent clock -> rtc | |
910 | * The less preferred source will only be tried if there is no better | |
911 | * usable source. The rtc part is handled separately in rtc core code. | |
912 | */ | |
913 | cycle_now = clock->read(clock); | |
914 | if ((clock->flags & CLOCK_SOURCE_SUSPEND_NONSTOP) && | |
915 | cycle_now > clock->cycle_last) { | |
916 | u64 num, max = ULLONG_MAX; | |
917 | u32 mult = clock->mult; | |
918 | u32 shift = clock->shift; | |
919 | s64 nsec = 0; | |
920 | ||
921 | cycle_delta = (cycle_now - clock->cycle_last) & clock->mask; | |
922 | ||
923 | /* | |
924 | * "cycle_delta * mutl" may cause 64 bits overflow, if the | |
925 | * suspended time is too long. In that case we need do the | |
926 | * 64 bits math carefully | |
927 | */ | |
928 | do_div(max, mult); | |
929 | if (cycle_delta > max) { | |
930 | num = div64_u64(cycle_delta, max); | |
931 | nsec = (((u64) max * mult) >> shift) * num; | |
932 | cycle_delta -= num * max; | |
933 | } | |
934 | nsec += ((u64) cycle_delta * mult) >> shift; | |
935 | ||
936 | ts_delta = ns_to_timespec(nsec); | |
937 | suspendtime_found = true; | |
938 | } else if (timespec_compare(&ts_new, &timekeeping_suspend_time) > 0) { | |
939 | ts_delta = timespec_sub(ts_new, timekeeping_suspend_time); | |
940 | suspendtime_found = true; | |
8524070b | 941 | } |
e445cf1c FT |
942 | |
943 | if (suspendtime_found) | |
944 | __timekeeping_inject_sleeptime(tk, &ts_delta); | |
945 | ||
946 | /* Re-base the last cycle value */ | |
947 | clock->cycle_last = cycle_now; | |
4e250fdd | 948 | tk->ntp_error = 0; |
8524070b | 949 | timekeeping_suspended = 0; |
4e250fdd | 950 | timekeeping_update(tk, false); |
9a7a71b1 TG |
951 | write_seqcount_end(&timekeeper_seq); |
952 | raw_spin_unlock_irqrestore(&timekeeper_lock, flags); | |
8524070b JS |
953 | |
954 | touch_softlockup_watchdog(); | |
955 | ||
956 | clockevents_notify(CLOCK_EVT_NOTIFY_RESUME, NULL); | |
957 | ||
958 | /* Resume hrtimers */ | |
b12a03ce | 959 | hrtimers_resume(); |
8524070b JS |
960 | } |
961 | ||
e1a85b2c | 962 | static int timekeeping_suspend(void) |
8524070b | 963 | { |
4e250fdd | 964 | struct timekeeper *tk = &timekeeper; |
92c1d3ed | 965 | unsigned long flags; |
cb33217b JS |
966 | struct timespec delta, delta_delta; |
967 | static struct timespec old_delta; | |
8524070b | 968 | |
d4f587c6 | 969 | read_persistent_clock(&timekeeping_suspend_time); |
3be90950 | 970 | |
9a7a71b1 TG |
971 | raw_spin_lock_irqsave(&timekeeper_lock, flags); |
972 | write_seqcount_begin(&timekeeper_seq); | |
4e250fdd | 973 | timekeeping_forward_now(tk); |
8524070b | 974 | timekeeping_suspended = 1; |
cb33217b JS |
975 | |
976 | /* | |
977 | * To avoid drift caused by repeated suspend/resumes, | |
978 | * which each can add ~1 second drift error, | |
979 | * try to compensate so the difference in system time | |
980 | * and persistent_clock time stays close to constant. | |
981 | */ | |
4e250fdd | 982 | delta = timespec_sub(tk_xtime(tk), timekeeping_suspend_time); |
cb33217b JS |
983 | delta_delta = timespec_sub(delta, old_delta); |
984 | if (abs(delta_delta.tv_sec) >= 2) { | |
985 | /* | |
986 | * if delta_delta is too large, assume time correction | |
987 | * has occured and set old_delta to the current delta. | |
988 | */ | |
989 | old_delta = delta; | |
990 | } else { | |
991 | /* Otherwise try to adjust old_system to compensate */ | |
992 | timekeeping_suspend_time = | |
993 | timespec_add(timekeeping_suspend_time, delta_delta); | |
994 | } | |
9a7a71b1 TG |
995 | write_seqcount_end(&timekeeper_seq); |
996 | raw_spin_unlock_irqrestore(&timekeeper_lock, flags); | |
8524070b JS |
997 | |
998 | clockevents_notify(CLOCK_EVT_NOTIFY_SUSPEND, NULL); | |
c54a42b1 | 999 | clocksource_suspend(); |
adc78e6b | 1000 | clockevents_suspend(); |
8524070b JS |
1001 | |
1002 | return 0; | |
1003 | } | |
1004 | ||
1005 | /* sysfs resume/suspend bits for timekeeping */ | |
e1a85b2c | 1006 | static struct syscore_ops timekeeping_syscore_ops = { |
8524070b JS |
1007 | .resume = timekeeping_resume, |
1008 | .suspend = timekeeping_suspend, | |
8524070b JS |
1009 | }; |
1010 | ||
e1a85b2c | 1011 | static int __init timekeeping_init_ops(void) |
8524070b | 1012 | { |
e1a85b2c RW |
1013 | register_syscore_ops(&timekeeping_syscore_ops); |
1014 | return 0; | |
8524070b JS |
1015 | } |
1016 | ||
e1a85b2c | 1017 | device_initcall(timekeeping_init_ops); |
8524070b JS |
1018 | |
1019 | /* | |
1020 | * If the error is already larger, we look ahead even further | |
1021 | * to compensate for late or lost adjustments. | |
1022 | */ | |
f726a697 JS |
1023 | static __always_inline int timekeeping_bigadjust(struct timekeeper *tk, |
1024 | s64 error, s64 *interval, | |
8524070b JS |
1025 | s64 *offset) |
1026 | { | |
1027 | s64 tick_error, i; | |
1028 | u32 look_ahead, adj; | |
1029 | s32 error2, mult; | |
1030 | ||
1031 | /* | |
1032 | * Use the current error value to determine how much to look ahead. | |
1033 | * The larger the error the slower we adjust for it to avoid problems | |
1034 | * with losing too many ticks, otherwise we would overadjust and | |
1035 | * produce an even larger error. The smaller the adjustment the | |
1036 | * faster we try to adjust for it, as lost ticks can do less harm | |
3eb05676 | 1037 | * here. This is tuned so that an error of about 1 msec is adjusted |
8524070b JS |
1038 | * within about 1 sec (or 2^20 nsec in 2^SHIFT_HZ ticks). |
1039 | */ | |
f726a697 | 1040 | error2 = tk->ntp_error >> (NTP_SCALE_SHIFT + 22 - 2 * SHIFT_HZ); |
8524070b JS |
1041 | error2 = abs(error2); |
1042 | for (look_ahead = 0; error2 > 0; look_ahead++) | |
1043 | error2 >>= 2; | |
1044 | ||
1045 | /* | |
1046 | * Now calculate the error in (1 << look_ahead) ticks, but first | |
1047 | * remove the single look ahead already included in the error. | |
1048 | */ | |
f726a697 JS |
1049 | tick_error = ntp_tick_length() >> (tk->ntp_error_shift + 1); |
1050 | tick_error -= tk->xtime_interval >> 1; | |
8524070b JS |
1051 | error = ((error - tick_error) >> look_ahead) + tick_error; |
1052 | ||
1053 | /* Finally calculate the adjustment shift value. */ | |
1054 | i = *interval; | |
1055 | mult = 1; | |
1056 | if (error < 0) { | |
1057 | error = -error; | |
1058 | *interval = -*interval; | |
1059 | *offset = -*offset; | |
1060 | mult = -1; | |
1061 | } | |
1062 | for (adj = 0; error > i; adj++) | |
1063 | error >>= 1; | |
1064 | ||
1065 | *interval <<= adj; | |
1066 | *offset <<= adj; | |
1067 | return mult << adj; | |
1068 | } | |
1069 | ||
1070 | /* | |
1071 | * Adjust the multiplier to reduce the error value, | |
1072 | * this is optimized for the most common adjustments of -1,0,1, | |
1073 | * for other values we can do a bit more work. | |
1074 | */ | |
f726a697 | 1075 | static void timekeeping_adjust(struct timekeeper *tk, s64 offset) |
8524070b | 1076 | { |
f726a697 | 1077 | s64 error, interval = tk->cycle_interval; |
8524070b JS |
1078 | int adj; |
1079 | ||
c2bc1111 | 1080 | /* |
88b28adf | 1081 | * The point of this is to check if the error is greater than half |
c2bc1111 JS |
1082 | * an interval. |
1083 | * | |
1084 | * First we shift it down from NTP_SHIFT to clocksource->shifted nsecs. | |
1085 | * | |
1086 | * Note we subtract one in the shift, so that error is really error*2. | |
3f86f28f JS |
1087 | * This "saves" dividing(shifting) interval twice, but keeps the |
1088 | * (error > interval) comparison as still measuring if error is | |
88b28adf | 1089 | * larger than half an interval. |
c2bc1111 | 1090 | * |
3f86f28f | 1091 | * Note: It does not "save" on aggravation when reading the code. |
c2bc1111 | 1092 | */ |
f726a697 | 1093 | error = tk->ntp_error >> (tk->ntp_error_shift - 1); |
8524070b | 1094 | if (error > interval) { |
c2bc1111 JS |
1095 | /* |
1096 | * We now divide error by 4(via shift), which checks if | |
88b28adf | 1097 | * the error is greater than twice the interval. |
c2bc1111 JS |
1098 | * If it is greater, we need a bigadjust, if its smaller, |
1099 | * we can adjust by 1. | |
1100 | */ | |
8524070b | 1101 | error >>= 2; |
c2bc1111 JS |
1102 | /* |
1103 | * XXX - In update_wall_time, we round up to the next | |
1104 | * nanosecond, and store the amount rounded up into | |
1105 | * the error. This causes the likely below to be unlikely. | |
1106 | * | |
3f86f28f | 1107 | * The proper fix is to avoid rounding up by using |
4e250fdd | 1108 | * the high precision tk->xtime_nsec instead of |
c2bc1111 JS |
1109 | * xtime.tv_nsec everywhere. Fixing this will take some |
1110 | * time. | |
1111 | */ | |
8524070b JS |
1112 | if (likely(error <= interval)) |
1113 | adj = 1; | |
1114 | else | |
1d17d174 IM |
1115 | adj = timekeeping_bigadjust(tk, error, &interval, &offset); |
1116 | } else { | |
1117 | if (error < -interval) { | |
1118 | /* See comment above, this is just switched for the negative */ | |
1119 | error >>= 2; | |
1120 | if (likely(error >= -interval)) { | |
1121 | adj = -1; | |
1122 | interval = -interval; | |
1123 | offset = -offset; | |
1124 | } else { | |
1125 | adj = timekeeping_bigadjust(tk, error, &interval, &offset); | |
1126 | } | |
1127 | } else { | |
1128 | goto out_adjust; | |
1129 | } | |
1130 | } | |
8524070b | 1131 | |
f726a697 JS |
1132 | if (unlikely(tk->clock->maxadj && |
1133 | (tk->mult + adj > tk->clock->mult + tk->clock->maxadj))) { | |
e919cfd4 JS |
1134 | printk_once(KERN_WARNING |
1135 | "Adjusting %s more than 11%% (%ld vs %ld)\n", | |
f726a697 JS |
1136 | tk->clock->name, (long)tk->mult + adj, |
1137 | (long)tk->clock->mult + tk->clock->maxadj); | |
e919cfd4 | 1138 | } |
c2bc1111 JS |
1139 | /* |
1140 | * So the following can be confusing. | |
1141 | * | |
1142 | * To keep things simple, lets assume adj == 1 for now. | |
1143 | * | |
1144 | * When adj != 1, remember that the interval and offset values | |
1145 | * have been appropriately scaled so the math is the same. | |
1146 | * | |
1147 | * The basic idea here is that we're increasing the multiplier | |
1148 | * by one, this causes the xtime_interval to be incremented by | |
1149 | * one cycle_interval. This is because: | |
1150 | * xtime_interval = cycle_interval * mult | |
1151 | * So if mult is being incremented by one: | |
1152 | * xtime_interval = cycle_interval * (mult + 1) | |
1153 | * Its the same as: | |
1154 | * xtime_interval = (cycle_interval * mult) + cycle_interval | |
1155 | * Which can be shortened to: | |
1156 | * xtime_interval += cycle_interval | |
1157 | * | |
1158 | * So offset stores the non-accumulated cycles. Thus the current | |
1159 | * time (in shifted nanoseconds) is: | |
1160 | * now = (offset * adj) + xtime_nsec | |
1161 | * Now, even though we're adjusting the clock frequency, we have | |
1162 | * to keep time consistent. In other words, we can't jump back | |
1163 | * in time, and we also want to avoid jumping forward in time. | |
1164 | * | |
1165 | * So given the same offset value, we need the time to be the same | |
1166 | * both before and after the freq adjustment. | |
1167 | * now = (offset * adj_1) + xtime_nsec_1 | |
1168 | * now = (offset * adj_2) + xtime_nsec_2 | |
1169 | * So: | |
1170 | * (offset * adj_1) + xtime_nsec_1 = | |
1171 | * (offset * adj_2) + xtime_nsec_2 | |
1172 | * And we know: | |
1173 | * adj_2 = adj_1 + 1 | |
1174 | * So: | |
1175 | * (offset * adj_1) + xtime_nsec_1 = | |
1176 | * (offset * (adj_1+1)) + xtime_nsec_2 | |
1177 | * (offset * adj_1) + xtime_nsec_1 = | |
1178 | * (offset * adj_1) + offset + xtime_nsec_2 | |
1179 | * Canceling the sides: | |
1180 | * xtime_nsec_1 = offset + xtime_nsec_2 | |
1181 | * Which gives us: | |
1182 | * xtime_nsec_2 = xtime_nsec_1 - offset | |
1183 | * Which simplfies to: | |
1184 | * xtime_nsec -= offset | |
1185 | * | |
1186 | * XXX - TODO: Doc ntp_error calculation. | |
1187 | */ | |
f726a697 JS |
1188 | tk->mult += adj; |
1189 | tk->xtime_interval += interval; | |
1190 | tk->xtime_nsec -= offset; | |
1191 | tk->ntp_error -= (interval - offset) << tk->ntp_error_shift; | |
2a8c0883 | 1192 | |
1d17d174 | 1193 | out_adjust: |
2a8c0883 JS |
1194 | /* |
1195 | * It may be possible that when we entered this function, xtime_nsec | |
1196 | * was very small. Further, if we're slightly speeding the clocksource | |
1197 | * in the code above, its possible the required corrective factor to | |
1198 | * xtime_nsec could cause it to underflow. | |
1199 | * | |
1200 | * Now, since we already accumulated the second, cannot simply roll | |
1201 | * the accumulated second back, since the NTP subsystem has been | |
1202 | * notified via second_overflow. So instead we push xtime_nsec forward | |
1203 | * by the amount we underflowed, and add that amount into the error. | |
1204 | * | |
1205 | * We'll correct this error next time through this function, when | |
1206 | * xtime_nsec is not as small. | |
1207 | */ | |
f726a697 JS |
1208 | if (unlikely((s64)tk->xtime_nsec < 0)) { |
1209 | s64 neg = -(s64)tk->xtime_nsec; | |
1210 | tk->xtime_nsec = 0; | |
1211 | tk->ntp_error += neg << tk->ntp_error_shift; | |
2a8c0883 JS |
1212 | } |
1213 | ||
8524070b JS |
1214 | } |
1215 | ||
1f4f9487 JS |
1216 | /** |
1217 | * accumulate_nsecs_to_secs - Accumulates nsecs into secs | |
1218 | * | |
1219 | * Helper function that accumulates a the nsecs greater then a second | |
1220 | * from the xtime_nsec field to the xtime_secs field. | |
1221 | * It also calls into the NTP code to handle leapsecond processing. | |
1222 | * | |
1223 | */ | |
1224 | static inline void accumulate_nsecs_to_secs(struct timekeeper *tk) | |
1225 | { | |
1226 | u64 nsecps = (u64)NSEC_PER_SEC << tk->shift; | |
1227 | ||
1228 | while (tk->xtime_nsec >= nsecps) { | |
1229 | int leap; | |
1230 | ||
1231 | tk->xtime_nsec -= nsecps; | |
1232 | tk->xtime_sec++; | |
1233 | ||
1234 | /* Figure out if its a leap sec and apply if needed */ | |
1235 | leap = second_overflow(tk->xtime_sec); | |
6d0ef903 JS |
1236 | if (unlikely(leap)) { |
1237 | struct timespec ts; | |
1238 | ||
1239 | tk->xtime_sec += leap; | |
1f4f9487 | 1240 | |
6d0ef903 JS |
1241 | ts.tv_sec = leap; |
1242 | ts.tv_nsec = 0; | |
1243 | tk_set_wall_to_mono(tk, | |
1244 | timespec_sub(tk->wall_to_monotonic, ts)); | |
1245 | ||
cc244dda JS |
1246 | __timekeeping_set_tai_offset(tk, tk->tai_offset - leap); |
1247 | ||
6d0ef903 JS |
1248 | clock_was_set_delayed(); |
1249 | } | |
1f4f9487 JS |
1250 | } |
1251 | } | |
1252 | ||
a092ff0f JS |
1253 | /** |
1254 | * logarithmic_accumulation - shifted accumulation of cycles | |
1255 | * | |
1256 | * This functions accumulates a shifted interval of cycles into | |
1257 | * into a shifted interval nanoseconds. Allows for O(log) accumulation | |
1258 | * loop. | |
1259 | * | |
1260 | * Returns the unconsumed cycles. | |
1261 | */ | |
f726a697 JS |
1262 | static cycle_t logarithmic_accumulation(struct timekeeper *tk, cycle_t offset, |
1263 | u32 shift) | |
a092ff0f | 1264 | { |
23a9537a | 1265 | cycle_t interval = tk->cycle_interval << shift; |
deda2e81 | 1266 | u64 raw_nsecs; |
a092ff0f | 1267 | |
f726a697 | 1268 | /* If the offset is smaller then a shifted interval, do nothing */ |
23a9537a | 1269 | if (offset < interval) |
a092ff0f JS |
1270 | return offset; |
1271 | ||
1272 | /* Accumulate one shifted interval */ | |
23a9537a TG |
1273 | offset -= interval; |
1274 | tk->clock->cycle_last += interval; | |
a092ff0f | 1275 | |
f726a697 JS |
1276 | tk->xtime_nsec += tk->xtime_interval << shift; |
1277 | accumulate_nsecs_to_secs(tk); | |
a092ff0f | 1278 | |
deda2e81 | 1279 | /* Accumulate raw time */ |
5b3900cd | 1280 | raw_nsecs = (u64)tk->raw_interval << shift; |
f726a697 | 1281 | raw_nsecs += tk->raw_time.tv_nsec; |
c7dcf87a JS |
1282 | if (raw_nsecs >= NSEC_PER_SEC) { |
1283 | u64 raw_secs = raw_nsecs; | |
1284 | raw_nsecs = do_div(raw_secs, NSEC_PER_SEC); | |
f726a697 | 1285 | tk->raw_time.tv_sec += raw_secs; |
a092ff0f | 1286 | } |
f726a697 | 1287 | tk->raw_time.tv_nsec = raw_nsecs; |
a092ff0f JS |
1288 | |
1289 | /* Accumulate error between NTP and clock interval */ | |
f726a697 JS |
1290 | tk->ntp_error += ntp_tick_length() << shift; |
1291 | tk->ntp_error -= (tk->xtime_interval + tk->xtime_remainder) << | |
1292 | (tk->ntp_error_shift + shift); | |
a092ff0f JS |
1293 | |
1294 | return offset; | |
1295 | } | |
1296 | ||
92bb1fcf JS |
1297 | #ifdef CONFIG_GENERIC_TIME_VSYSCALL_OLD |
1298 | static inline void old_vsyscall_fixup(struct timekeeper *tk) | |
1299 | { | |
1300 | s64 remainder; | |
1301 | ||
1302 | /* | |
1303 | * Store only full nanoseconds into xtime_nsec after rounding | |
1304 | * it up and add the remainder to the error difference. | |
1305 | * XXX - This is necessary to avoid small 1ns inconsistnecies caused | |
1306 | * by truncating the remainder in vsyscalls. However, it causes | |
1307 | * additional work to be done in timekeeping_adjust(). Once | |
1308 | * the vsyscall implementations are converted to use xtime_nsec | |
1309 | * (shifted nanoseconds), and CONFIG_GENERIC_TIME_VSYSCALL_OLD | |
1310 | * users are removed, this can be killed. | |
1311 | */ | |
1312 | remainder = tk->xtime_nsec & ((1ULL << tk->shift) - 1); | |
1313 | tk->xtime_nsec -= remainder; | |
1314 | tk->xtime_nsec += 1ULL << tk->shift; | |
1315 | tk->ntp_error += remainder << tk->ntp_error_shift; | |
1316 | ||
1317 | } | |
1318 | #else | |
1319 | #define old_vsyscall_fixup(tk) | |
1320 | #endif | |
1321 | ||
1322 | ||
1323 | ||
8524070b JS |
1324 | /** |
1325 | * update_wall_time - Uses the current clocksource to increment the wall time | |
1326 | * | |
8524070b | 1327 | */ |
871cf1e5 | 1328 | static void update_wall_time(void) |
8524070b | 1329 | { |
155ec602 | 1330 | struct clocksource *clock; |
4e250fdd | 1331 | struct timekeeper *tk = &timekeeper; |
8524070b | 1332 | cycle_t offset; |
a092ff0f | 1333 | int shift = 0, maxshift; |
70471f2f JS |
1334 | unsigned long flags; |
1335 | ||
9a7a71b1 TG |
1336 | raw_spin_lock_irqsave(&timekeeper_lock, flags); |
1337 | write_seqcount_begin(&timekeeper_seq); | |
8524070b JS |
1338 | |
1339 | /* Make sure we're fully resumed: */ | |
1340 | if (unlikely(timekeeping_suspended)) | |
70471f2f | 1341 | goto out; |
8524070b | 1342 | |
4e250fdd | 1343 | clock = tk->clock; |
592913ec JS |
1344 | |
1345 | #ifdef CONFIG_ARCH_USES_GETTIMEOFFSET | |
4e250fdd | 1346 | offset = tk->cycle_interval; |
592913ec JS |
1347 | #else |
1348 | offset = (clock->read(clock) - clock->cycle_last) & clock->mask; | |
8524070b | 1349 | #endif |
8524070b | 1350 | |
bf2ac312 JS |
1351 | /* Check if there's really nothing to do */ |
1352 | if (offset < tk->cycle_interval) | |
1353 | goto out; | |
1354 | ||
a092ff0f JS |
1355 | /* |
1356 | * With NO_HZ we may have to accumulate many cycle_intervals | |
1357 | * (think "ticks") worth of time at once. To do this efficiently, | |
1358 | * we calculate the largest doubling multiple of cycle_intervals | |
88b28adf | 1359 | * that is smaller than the offset. We then accumulate that |
a092ff0f JS |
1360 | * chunk in one go, and then try to consume the next smaller |
1361 | * doubled multiple. | |
8524070b | 1362 | */ |
4e250fdd | 1363 | shift = ilog2(offset) - ilog2(tk->cycle_interval); |
a092ff0f | 1364 | shift = max(0, shift); |
88b28adf | 1365 | /* Bound shift to one less than what overflows tick_length */ |
ea7cf49a | 1366 | maxshift = (64 - (ilog2(ntp_tick_length())+1)) - 1; |
a092ff0f | 1367 | shift = min(shift, maxshift); |
4e250fdd JS |
1368 | while (offset >= tk->cycle_interval) { |
1369 | offset = logarithmic_accumulation(tk, offset, shift); | |
1370 | if (offset < tk->cycle_interval<<shift) | |
830ec045 | 1371 | shift--; |
8524070b JS |
1372 | } |
1373 | ||
1374 | /* correct the clock when NTP error is too big */ | |
4e250fdd | 1375 | timekeeping_adjust(tk, offset); |
8524070b | 1376 | |
6a867a39 | 1377 | /* |
92bb1fcf JS |
1378 | * XXX This can be killed once everyone converts |
1379 | * to the new update_vsyscall. | |
1380 | */ | |
1381 | old_vsyscall_fixup(tk); | |
8524070b | 1382 | |
6a867a39 JS |
1383 | /* |
1384 | * Finally, make sure that after the rounding | |
1e75fa8b | 1385 | * xtime_nsec isn't larger than NSEC_PER_SEC |
6a867a39 | 1386 | */ |
4e250fdd | 1387 | accumulate_nsecs_to_secs(tk); |
83f57a11 | 1388 | |
4e250fdd | 1389 | timekeeping_update(tk, false); |
70471f2f JS |
1390 | |
1391 | out: | |
9a7a71b1 TG |
1392 | write_seqcount_end(&timekeeper_seq); |
1393 | raw_spin_unlock_irqrestore(&timekeeper_lock, flags); | |
70471f2f | 1394 | |
8524070b | 1395 | } |
7c3f1a57 TJ |
1396 | |
1397 | /** | |
1398 | * getboottime - Return the real time of system boot. | |
1399 | * @ts: pointer to the timespec to be set | |
1400 | * | |
abb3a4ea | 1401 | * Returns the wall-time of boot in a timespec. |
7c3f1a57 TJ |
1402 | * |
1403 | * This is based on the wall_to_monotonic offset and the total suspend | |
1404 | * time. Calls to settimeofday will affect the value returned (which | |
1405 | * basically means that however wrong your real time clock is at boot time, | |
1406 | * you get the right time here). | |
1407 | */ | |
1408 | void getboottime(struct timespec *ts) | |
1409 | { | |
4e250fdd | 1410 | struct timekeeper *tk = &timekeeper; |
36d47481 | 1411 | struct timespec boottime = { |
4e250fdd JS |
1412 | .tv_sec = tk->wall_to_monotonic.tv_sec + |
1413 | tk->total_sleep_time.tv_sec, | |
1414 | .tv_nsec = tk->wall_to_monotonic.tv_nsec + | |
1415 | tk->total_sleep_time.tv_nsec | |
36d47481 | 1416 | }; |
d4f587c6 | 1417 | |
d4f587c6 | 1418 | set_normalized_timespec(ts, -boottime.tv_sec, -boottime.tv_nsec); |
7c3f1a57 | 1419 | } |
c93d89f3 | 1420 | EXPORT_SYMBOL_GPL(getboottime); |
7c3f1a57 | 1421 | |
abb3a4ea JS |
1422 | /** |
1423 | * get_monotonic_boottime - Returns monotonic time since boot | |
1424 | * @ts: pointer to the timespec to be set | |
1425 | * | |
1426 | * Returns the monotonic time since boot in a timespec. | |
1427 | * | |
1428 | * This is similar to CLOCK_MONTONIC/ktime_get_ts, but also | |
1429 | * includes the time spent in suspend. | |
1430 | */ | |
1431 | void get_monotonic_boottime(struct timespec *ts) | |
1432 | { | |
4e250fdd | 1433 | struct timekeeper *tk = &timekeeper; |
abb3a4ea | 1434 | struct timespec tomono, sleep; |
ec145bab | 1435 | s64 nsec; |
abb3a4ea | 1436 | unsigned int seq; |
abb3a4ea JS |
1437 | |
1438 | WARN_ON(timekeeping_suspended); | |
1439 | ||
1440 | do { | |
9a7a71b1 | 1441 | seq = read_seqcount_begin(&timekeeper_seq); |
4e250fdd | 1442 | ts->tv_sec = tk->xtime_sec; |
ec145bab | 1443 | nsec = timekeeping_get_ns(tk); |
4e250fdd JS |
1444 | tomono = tk->wall_to_monotonic; |
1445 | sleep = tk->total_sleep_time; | |
abb3a4ea | 1446 | |
9a7a71b1 | 1447 | } while (read_seqcount_retry(&timekeeper_seq, seq)); |
abb3a4ea | 1448 | |
ec145bab JS |
1449 | ts->tv_sec += tomono.tv_sec + sleep.tv_sec; |
1450 | ts->tv_nsec = 0; | |
1451 | timespec_add_ns(ts, nsec + tomono.tv_nsec + sleep.tv_nsec); | |
abb3a4ea JS |
1452 | } |
1453 | EXPORT_SYMBOL_GPL(get_monotonic_boottime); | |
1454 | ||
1455 | /** | |
1456 | * ktime_get_boottime - Returns monotonic time since boot in a ktime | |
1457 | * | |
1458 | * Returns the monotonic time since boot in a ktime | |
1459 | * | |
1460 | * This is similar to CLOCK_MONTONIC/ktime_get, but also | |
1461 | * includes the time spent in suspend. | |
1462 | */ | |
1463 | ktime_t ktime_get_boottime(void) | |
1464 | { | |
1465 | struct timespec ts; | |
1466 | ||
1467 | get_monotonic_boottime(&ts); | |
1468 | return timespec_to_ktime(ts); | |
1469 | } | |
1470 | EXPORT_SYMBOL_GPL(ktime_get_boottime); | |
1471 | ||
7c3f1a57 TJ |
1472 | /** |
1473 | * monotonic_to_bootbased - Convert the monotonic time to boot based. | |
1474 | * @ts: pointer to the timespec to be converted | |
1475 | */ | |
1476 | void monotonic_to_bootbased(struct timespec *ts) | |
1477 | { | |
4e250fdd JS |
1478 | struct timekeeper *tk = &timekeeper; |
1479 | ||
1480 | *ts = timespec_add(*ts, tk->total_sleep_time); | |
7c3f1a57 | 1481 | } |
c93d89f3 | 1482 | EXPORT_SYMBOL_GPL(monotonic_to_bootbased); |
2c6b47de | 1483 | |
17c38b74 JS |
1484 | unsigned long get_seconds(void) |
1485 | { | |
4e250fdd JS |
1486 | struct timekeeper *tk = &timekeeper; |
1487 | ||
1488 | return tk->xtime_sec; | |
17c38b74 JS |
1489 | } |
1490 | EXPORT_SYMBOL(get_seconds); | |
1491 | ||
da15cfda JS |
1492 | struct timespec __current_kernel_time(void) |
1493 | { | |
4e250fdd JS |
1494 | struct timekeeper *tk = &timekeeper; |
1495 | ||
1496 | return tk_xtime(tk); | |
da15cfda | 1497 | } |
17c38b74 | 1498 | |
2c6b47de JS |
1499 | struct timespec current_kernel_time(void) |
1500 | { | |
4e250fdd | 1501 | struct timekeeper *tk = &timekeeper; |
2c6b47de JS |
1502 | struct timespec now; |
1503 | unsigned long seq; | |
1504 | ||
1505 | do { | |
9a7a71b1 | 1506 | seq = read_seqcount_begin(&timekeeper_seq); |
83f57a11 | 1507 | |
4e250fdd | 1508 | now = tk_xtime(tk); |
9a7a71b1 | 1509 | } while (read_seqcount_retry(&timekeeper_seq, seq)); |
2c6b47de JS |
1510 | |
1511 | return now; | |
1512 | } | |
2c6b47de | 1513 | EXPORT_SYMBOL(current_kernel_time); |
da15cfda JS |
1514 | |
1515 | struct timespec get_monotonic_coarse(void) | |
1516 | { | |
4e250fdd | 1517 | struct timekeeper *tk = &timekeeper; |
da15cfda JS |
1518 | struct timespec now, mono; |
1519 | unsigned long seq; | |
1520 | ||
1521 | do { | |
9a7a71b1 | 1522 | seq = read_seqcount_begin(&timekeeper_seq); |
83f57a11 | 1523 | |
4e250fdd JS |
1524 | now = tk_xtime(tk); |
1525 | mono = tk->wall_to_monotonic; | |
9a7a71b1 | 1526 | } while (read_seqcount_retry(&timekeeper_seq, seq)); |
da15cfda JS |
1527 | |
1528 | set_normalized_timespec(&now, now.tv_sec + mono.tv_sec, | |
1529 | now.tv_nsec + mono.tv_nsec); | |
1530 | return now; | |
1531 | } | |
871cf1e5 TH |
1532 | |
1533 | /* | |
d6ad4187 | 1534 | * Must hold jiffies_lock |
871cf1e5 TH |
1535 | */ |
1536 | void do_timer(unsigned long ticks) | |
1537 | { | |
1538 | jiffies_64 += ticks; | |
1539 | update_wall_time(); | |
1540 | calc_global_load(ticks); | |
1541 | } | |
48cf76f7 TH |
1542 | |
1543 | /** | |
314ac371 JS |
1544 | * get_xtime_and_monotonic_and_sleep_offset() - get xtime, wall_to_monotonic, |
1545 | * and sleep offsets. | |
48cf76f7 TH |
1546 | * @xtim: pointer to timespec to be set with xtime |
1547 | * @wtom: pointer to timespec to be set with wall_to_monotonic | |
314ac371 | 1548 | * @sleep: pointer to timespec to be set with time in suspend |
48cf76f7 | 1549 | */ |
314ac371 JS |
1550 | void get_xtime_and_monotonic_and_sleep_offset(struct timespec *xtim, |
1551 | struct timespec *wtom, struct timespec *sleep) | |
48cf76f7 | 1552 | { |
4e250fdd | 1553 | struct timekeeper *tk = &timekeeper; |
48cf76f7 TH |
1554 | unsigned long seq; |
1555 | ||
1556 | do { | |
9a7a71b1 | 1557 | seq = read_seqcount_begin(&timekeeper_seq); |
4e250fdd JS |
1558 | *xtim = tk_xtime(tk); |
1559 | *wtom = tk->wall_to_monotonic; | |
1560 | *sleep = tk->total_sleep_time; | |
9a7a71b1 | 1561 | } while (read_seqcount_retry(&timekeeper_seq, seq)); |
48cf76f7 | 1562 | } |
f0af911a | 1563 | |
f6c06abf TG |
1564 | #ifdef CONFIG_HIGH_RES_TIMERS |
1565 | /** | |
1566 | * ktime_get_update_offsets - hrtimer helper | |
1567 | * @offs_real: pointer to storage for monotonic -> realtime offset | |
1568 | * @offs_boot: pointer to storage for monotonic -> boottime offset | |
1569 | * | |
1570 | * Returns current monotonic time and updates the offsets | |
1571 | * Called from hrtimer_interupt() or retrigger_next_event() | |
1572 | */ | |
90adda98 JS |
1573 | ktime_t ktime_get_update_offsets(ktime_t *offs_real, ktime_t *offs_boot, |
1574 | ktime_t *offs_tai) | |
f6c06abf | 1575 | { |
4e250fdd | 1576 | struct timekeeper *tk = &timekeeper; |
f6c06abf TG |
1577 | ktime_t now; |
1578 | unsigned int seq; | |
1579 | u64 secs, nsecs; | |
1580 | ||
1581 | do { | |
9a7a71b1 | 1582 | seq = read_seqcount_begin(&timekeeper_seq); |
f6c06abf | 1583 | |
4e250fdd JS |
1584 | secs = tk->xtime_sec; |
1585 | nsecs = timekeeping_get_ns(tk); | |
f6c06abf | 1586 | |
4e250fdd JS |
1587 | *offs_real = tk->offs_real; |
1588 | *offs_boot = tk->offs_boot; | |
90adda98 | 1589 | *offs_tai = tk->offs_tai; |
9a7a71b1 | 1590 | } while (read_seqcount_retry(&timekeeper_seq, seq)); |
f6c06abf TG |
1591 | |
1592 | now = ktime_add_ns(ktime_set(secs, 0), nsecs); | |
1593 | now = ktime_sub(now, *offs_real); | |
1594 | return now; | |
1595 | } | |
1596 | #endif | |
1597 | ||
99ee5315 TG |
1598 | /** |
1599 | * ktime_get_monotonic_offset() - get wall_to_monotonic in ktime_t format | |
1600 | */ | |
1601 | ktime_t ktime_get_monotonic_offset(void) | |
1602 | { | |
4e250fdd | 1603 | struct timekeeper *tk = &timekeeper; |
99ee5315 TG |
1604 | unsigned long seq; |
1605 | struct timespec wtom; | |
1606 | ||
1607 | do { | |
9a7a71b1 | 1608 | seq = read_seqcount_begin(&timekeeper_seq); |
4e250fdd | 1609 | wtom = tk->wall_to_monotonic; |
9a7a71b1 | 1610 | } while (read_seqcount_retry(&timekeeper_seq, seq)); |
70471f2f | 1611 | |
99ee5315 TG |
1612 | return timespec_to_ktime(wtom); |
1613 | } | |
a80b83b7 JS |
1614 | EXPORT_SYMBOL_GPL(ktime_get_monotonic_offset); |
1615 | ||
aa6f9c59 JS |
1616 | /** |
1617 | * do_adjtimex() - Accessor function to NTP __do_adjtimex function | |
1618 | */ | |
1619 | int do_adjtimex(struct timex *txc) | |
1620 | { | |
87ace39b JS |
1621 | struct timespec ts; |
1622 | s32 tai, orig_tai; | |
e4085693 JS |
1623 | int ret; |
1624 | ||
1625 | /* Validate the data before disabling interrupts */ | |
1626 | ret = ntp_validate_timex(txc); | |
1627 | if (ret) | |
1628 | return ret; | |
1629 | ||
cef90377 JS |
1630 | if (txc->modes & ADJ_SETOFFSET) { |
1631 | struct timespec delta; | |
1632 | delta.tv_sec = txc->time.tv_sec; | |
1633 | delta.tv_nsec = txc->time.tv_usec; | |
1634 | if (!(txc->modes & ADJ_NANO)) | |
1635 | delta.tv_nsec *= 1000; | |
1636 | ret = timekeeping_inject_offset(&delta); | |
1637 | if (ret) | |
1638 | return ret; | |
1639 | } | |
1640 | ||
87ace39b JS |
1641 | getnstimeofday(&ts); |
1642 | orig_tai = tai = timekeeping_get_tai_offset(); | |
1643 | ||
1644 | ret = __do_adjtimex(txc, &ts, &tai); | |
aa6f9c59 | 1645 | |
87ace39b JS |
1646 | if (tai != orig_tai) |
1647 | timekeeping_set_tai_offset(tai); | |
1648 | ||
1649 | return ret; | |
1650 | } | |
aa6f9c59 JS |
1651 | |
1652 | #ifdef CONFIG_NTP_PPS | |
1653 | /** | |
1654 | * hardpps() - Accessor function to NTP __hardpps function | |
1655 | */ | |
1656 | void hardpps(const struct timespec *phase_ts, const struct timespec *raw_ts) | |
1657 | { | |
1658 | __hardpps(phase_ts, raw_ts); | |
1659 | } | |
1660 | EXPORT_SYMBOL(hardpps); | |
1661 | #endif | |
1662 | ||
f0af911a TH |
1663 | /** |
1664 | * xtime_update() - advances the timekeeping infrastructure | |
1665 | * @ticks: number of ticks, that have elapsed since the last call. | |
1666 | * | |
1667 | * Must be called with interrupts disabled. | |
1668 | */ | |
1669 | void xtime_update(unsigned long ticks) | |
1670 | { | |
d6ad4187 | 1671 | write_seqlock(&jiffies_lock); |
f0af911a | 1672 | do_timer(ticks); |
d6ad4187 | 1673 | write_sequnlock(&jiffies_lock); |
f0af911a | 1674 | } |