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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; | |
48cdc135 | 32 | static struct timekeeper shadow_timekeeper; |
155ec602 | 33 | |
8fcce546 JS |
34 | /* flag for if timekeeping is suspended */ |
35 | int __read_mostly timekeeping_suspended; | |
36 | ||
31ade306 FT |
37 | /* Flag for if there is a persistent clock on this platform */ |
38 | bool __read_mostly persistent_clock_exist = false; | |
39 | ||
1e75fa8b JS |
40 | static inline void tk_normalize_xtime(struct timekeeper *tk) |
41 | { | |
42 | while (tk->xtime_nsec >= ((u64)NSEC_PER_SEC << tk->shift)) { | |
43 | tk->xtime_nsec -= (u64)NSEC_PER_SEC << tk->shift; | |
44 | tk->xtime_sec++; | |
45 | } | |
46 | } | |
47 | ||
1e75fa8b JS |
48 | static void tk_set_xtime(struct timekeeper *tk, const struct timespec *ts) |
49 | { | |
50 | tk->xtime_sec = ts->tv_sec; | |
b44d50dc | 51 | tk->xtime_nsec = (u64)ts->tv_nsec << tk->shift; |
1e75fa8b JS |
52 | } |
53 | ||
54 | static void tk_xtime_add(struct timekeeper *tk, const struct timespec *ts) | |
55 | { | |
56 | tk->xtime_sec += ts->tv_sec; | |
b44d50dc | 57 | tk->xtime_nsec += (u64)ts->tv_nsec << tk->shift; |
784ffcbb | 58 | tk_normalize_xtime(tk); |
1e75fa8b | 59 | } |
8fcce546 | 60 | |
6d0ef903 JS |
61 | static void tk_set_wall_to_mono(struct timekeeper *tk, struct timespec wtm) |
62 | { | |
63 | struct timespec tmp; | |
64 | ||
65 | /* | |
66 | * Verify consistency of: offset_real = -wall_to_monotonic | |
67 | * before modifying anything | |
68 | */ | |
69 | set_normalized_timespec(&tmp, -tk->wall_to_monotonic.tv_sec, | |
70 | -tk->wall_to_monotonic.tv_nsec); | |
71 | WARN_ON_ONCE(tk->offs_real.tv64 != timespec_to_ktime(tmp).tv64); | |
72 | tk->wall_to_monotonic = wtm; | |
73 | set_normalized_timespec(&tmp, -wtm.tv_sec, -wtm.tv_nsec); | |
74 | tk->offs_real = timespec_to_ktime(tmp); | |
90adda98 | 75 | tk->offs_tai = ktime_sub(tk->offs_real, ktime_set(tk->tai_offset, 0)); |
6d0ef903 JS |
76 | } |
77 | ||
78 | static void tk_set_sleep_time(struct timekeeper *tk, struct timespec t) | |
79 | { | |
80 | /* Verify consistency before modifying */ | |
81 | WARN_ON_ONCE(tk->offs_boot.tv64 != timespec_to_ktime(tk->total_sleep_time).tv64); | |
82 | ||
83 | tk->total_sleep_time = t; | |
84 | tk->offs_boot = timespec_to_ktime(t); | |
85 | } | |
86 | ||
155ec602 MS |
87 | /** |
88 | * timekeeper_setup_internals - Set up internals to use clocksource clock. | |
89 | * | |
90 | * @clock: Pointer to clocksource. | |
91 | * | |
92 | * Calculates a fixed cycle/nsec interval for a given clocksource/adjustment | |
93 | * pair and interval request. | |
94 | * | |
95 | * Unless you're the timekeeping code, you should not be using this! | |
96 | */ | |
f726a697 | 97 | static void tk_setup_internals(struct timekeeper *tk, struct clocksource *clock) |
155ec602 MS |
98 | { |
99 | cycle_t interval; | |
a386b5af | 100 | u64 tmp, ntpinterval; |
1e75fa8b | 101 | struct clocksource *old_clock; |
155ec602 | 102 | |
f726a697 JS |
103 | old_clock = tk->clock; |
104 | tk->clock = clock; | |
14a3b6ab | 105 | tk->cycle_last = clock->cycle_last = clock->read(clock); |
155ec602 MS |
106 | |
107 | /* Do the ns -> cycle conversion first, using original mult */ | |
108 | tmp = NTP_INTERVAL_LENGTH; | |
109 | tmp <<= clock->shift; | |
a386b5af | 110 | ntpinterval = tmp; |
0a544198 MS |
111 | tmp += clock->mult/2; |
112 | do_div(tmp, clock->mult); | |
155ec602 MS |
113 | if (tmp == 0) |
114 | tmp = 1; | |
115 | ||
116 | interval = (cycle_t) tmp; | |
f726a697 | 117 | tk->cycle_interval = interval; |
155ec602 MS |
118 | |
119 | /* Go back from cycles -> shifted ns */ | |
f726a697 JS |
120 | tk->xtime_interval = (u64) interval * clock->mult; |
121 | tk->xtime_remainder = ntpinterval - tk->xtime_interval; | |
122 | tk->raw_interval = | |
0a544198 | 123 | ((u64) interval * clock->mult) >> clock->shift; |
155ec602 | 124 | |
1e75fa8b JS |
125 | /* if changing clocks, convert xtime_nsec shift units */ |
126 | if (old_clock) { | |
127 | int shift_change = clock->shift - old_clock->shift; | |
128 | if (shift_change < 0) | |
f726a697 | 129 | tk->xtime_nsec >>= -shift_change; |
1e75fa8b | 130 | else |
f726a697 | 131 | tk->xtime_nsec <<= shift_change; |
1e75fa8b | 132 | } |
f726a697 | 133 | tk->shift = clock->shift; |
155ec602 | 134 | |
f726a697 JS |
135 | tk->ntp_error = 0; |
136 | tk->ntp_error_shift = NTP_SCALE_SHIFT - clock->shift; | |
0a544198 MS |
137 | |
138 | /* | |
139 | * The timekeeper keeps its own mult values for the currently | |
140 | * active clocksource. These value will be adjusted via NTP | |
141 | * to counteract clock drifting. | |
142 | */ | |
f726a697 | 143 | tk->mult = clock->mult; |
155ec602 | 144 | } |
8524070b | 145 | |
2ba2a305 | 146 | /* Timekeeper helper functions. */ |
7b1f6207 SW |
147 | |
148 | #ifdef CONFIG_ARCH_USES_GETTIMEOFFSET | |
149 | u32 (*arch_gettimeoffset)(void); | |
150 | ||
151 | u32 get_arch_timeoffset(void) | |
152 | { | |
153 | if (likely(arch_gettimeoffset)) | |
154 | return arch_gettimeoffset(); | |
155 | return 0; | |
156 | } | |
157 | #else | |
158 | static inline u32 get_arch_timeoffset(void) { return 0; } | |
159 | #endif | |
160 | ||
f726a697 | 161 | static inline s64 timekeeping_get_ns(struct timekeeper *tk) |
2ba2a305 MS |
162 | { |
163 | cycle_t cycle_now, cycle_delta; | |
164 | struct clocksource *clock; | |
1e75fa8b | 165 | s64 nsec; |
2ba2a305 MS |
166 | |
167 | /* read clocksource: */ | |
f726a697 | 168 | clock = tk->clock; |
2ba2a305 MS |
169 | cycle_now = clock->read(clock); |
170 | ||
171 | /* calculate the delta since the last update_wall_time: */ | |
172 | cycle_delta = (cycle_now - clock->cycle_last) & clock->mask; | |
173 | ||
f726a697 JS |
174 | nsec = cycle_delta * tk->mult + tk->xtime_nsec; |
175 | nsec >>= tk->shift; | |
f2a5a085 | 176 | |
7b1f6207 SW |
177 | /* If arch requires, add in get_arch_timeoffset() */ |
178 | return nsec + get_arch_timeoffset(); | |
2ba2a305 MS |
179 | } |
180 | ||
f726a697 | 181 | static inline s64 timekeeping_get_ns_raw(struct timekeeper *tk) |
2ba2a305 MS |
182 | { |
183 | cycle_t cycle_now, cycle_delta; | |
184 | struct clocksource *clock; | |
f2a5a085 | 185 | s64 nsec; |
2ba2a305 MS |
186 | |
187 | /* read clocksource: */ | |
f726a697 | 188 | clock = tk->clock; |
2ba2a305 MS |
189 | cycle_now = clock->read(clock); |
190 | ||
191 | /* calculate the delta since the last update_wall_time: */ | |
192 | cycle_delta = (cycle_now - clock->cycle_last) & clock->mask; | |
193 | ||
f2a5a085 JS |
194 | /* convert delta to nanoseconds. */ |
195 | nsec = clocksource_cyc2ns(cycle_delta, clock->mult, clock->shift); | |
196 | ||
7b1f6207 SW |
197 | /* If arch requires, add in get_arch_timeoffset() */ |
198 | return nsec + get_arch_timeoffset(); | |
2ba2a305 MS |
199 | } |
200 | ||
e0b306fe MT |
201 | static RAW_NOTIFIER_HEAD(pvclock_gtod_chain); |
202 | ||
203 | static void update_pvclock_gtod(struct timekeeper *tk) | |
204 | { | |
205 | raw_notifier_call_chain(&pvclock_gtod_chain, 0, tk); | |
206 | } | |
207 | ||
208 | /** | |
209 | * pvclock_gtod_register_notifier - register a pvclock timedata update listener | |
e0b306fe MT |
210 | */ |
211 | int pvclock_gtod_register_notifier(struct notifier_block *nb) | |
212 | { | |
213 | struct timekeeper *tk = &timekeeper; | |
214 | unsigned long flags; | |
215 | int ret; | |
216 | ||
9a7a71b1 | 217 | raw_spin_lock_irqsave(&timekeeper_lock, flags); |
e0b306fe | 218 | ret = raw_notifier_chain_register(&pvclock_gtod_chain, nb); |
e0b306fe | 219 | update_pvclock_gtod(tk); |
9a7a71b1 | 220 | raw_spin_unlock_irqrestore(&timekeeper_lock, flags); |
e0b306fe MT |
221 | |
222 | return ret; | |
223 | } | |
224 | EXPORT_SYMBOL_GPL(pvclock_gtod_register_notifier); | |
225 | ||
226 | /** | |
227 | * pvclock_gtod_unregister_notifier - unregister a pvclock | |
228 | * timedata update listener | |
e0b306fe MT |
229 | */ |
230 | int pvclock_gtod_unregister_notifier(struct notifier_block *nb) | |
231 | { | |
e0b306fe MT |
232 | unsigned long flags; |
233 | int ret; | |
234 | ||
9a7a71b1 | 235 | raw_spin_lock_irqsave(&timekeeper_lock, flags); |
e0b306fe | 236 | ret = raw_notifier_chain_unregister(&pvclock_gtod_chain, nb); |
9a7a71b1 | 237 | raw_spin_unlock_irqrestore(&timekeeper_lock, flags); |
e0b306fe MT |
238 | |
239 | return ret; | |
240 | } | |
241 | EXPORT_SYMBOL_GPL(pvclock_gtod_unregister_notifier); | |
242 | ||
9a7a71b1 | 243 | /* must hold timekeeper_lock */ |
48cdc135 | 244 | static void timekeeping_update(struct timekeeper *tk, bool clearntp, bool mirror) |
cc06268c TG |
245 | { |
246 | if (clearntp) { | |
f726a697 | 247 | tk->ntp_error = 0; |
cc06268c TG |
248 | ntp_clear(); |
249 | } | |
576094b7 | 250 | update_vsyscall(tk); |
e0b306fe | 251 | update_pvclock_gtod(tk); |
48cdc135 TG |
252 | |
253 | if (mirror) | |
254 | memcpy(&shadow_timekeeper, &timekeeper, sizeof(timekeeper)); | |
cc06268c TG |
255 | } |
256 | ||
8524070b | 257 | /** |
155ec602 | 258 | * timekeeping_forward_now - update clock to the current time |
8524070b | 259 | * |
9a055117 RZ |
260 | * Forward the current clock to update its state since the last call to |
261 | * update_wall_time(). This is useful before significant clock changes, | |
262 | * as it avoids having to deal with this time offset explicitly. | |
8524070b | 263 | */ |
f726a697 | 264 | static void timekeeping_forward_now(struct timekeeper *tk) |
8524070b JS |
265 | { |
266 | cycle_t cycle_now, cycle_delta; | |
155ec602 | 267 | struct clocksource *clock; |
9a055117 | 268 | s64 nsec; |
8524070b | 269 | |
f726a697 | 270 | clock = tk->clock; |
a0f7d48b | 271 | cycle_now = clock->read(clock); |
8524070b | 272 | cycle_delta = (cycle_now - clock->cycle_last) & clock->mask; |
14a3b6ab | 273 | tk->cycle_last = clock->cycle_last = cycle_now; |
8524070b | 274 | |
f726a697 | 275 | tk->xtime_nsec += cycle_delta * tk->mult; |
7d27558c | 276 | |
7b1f6207 SW |
277 | /* If arch requires, add in get_arch_timeoffset() */ |
278 | tk->xtime_nsec += (u64)get_arch_timeoffset() << tk->shift; | |
7d27558c | 279 | |
f726a697 | 280 | tk_normalize_xtime(tk); |
2d42244a | 281 | |
0a544198 | 282 | nsec = clocksource_cyc2ns(cycle_delta, clock->mult, clock->shift); |
f726a697 | 283 | timespec_add_ns(&tk->raw_time, nsec); |
8524070b JS |
284 | } |
285 | ||
286 | /** | |
1e817fb6 | 287 | * __getnstimeofday - Returns the time of day in a timespec. |
8524070b JS |
288 | * @ts: pointer to the timespec to be set |
289 | * | |
1e817fb6 KC |
290 | * Updates the time of day in the timespec. |
291 | * Returns 0 on success, or -ve when suspended (timespec will be undefined). | |
8524070b | 292 | */ |
1e817fb6 | 293 | int __getnstimeofday(struct timespec *ts) |
8524070b | 294 | { |
4e250fdd | 295 | struct timekeeper *tk = &timekeeper; |
8524070b | 296 | unsigned long seq; |
1e75fa8b | 297 | s64 nsecs = 0; |
8524070b JS |
298 | |
299 | do { | |
9a7a71b1 | 300 | seq = read_seqcount_begin(&timekeeper_seq); |
8524070b | 301 | |
4e250fdd | 302 | ts->tv_sec = tk->xtime_sec; |
ec145bab | 303 | nsecs = timekeeping_get_ns(tk); |
8524070b | 304 | |
9a7a71b1 | 305 | } while (read_seqcount_retry(&timekeeper_seq, seq)); |
8524070b | 306 | |
ec145bab | 307 | ts->tv_nsec = 0; |
8524070b | 308 | timespec_add_ns(ts, nsecs); |
1e817fb6 KC |
309 | |
310 | /* | |
311 | * Do not bail out early, in case there were callers still using | |
312 | * the value, even in the face of the WARN_ON. | |
313 | */ | |
314 | if (unlikely(timekeeping_suspended)) | |
315 | return -EAGAIN; | |
316 | return 0; | |
317 | } | |
318 | EXPORT_SYMBOL(__getnstimeofday); | |
319 | ||
320 | /** | |
321 | * getnstimeofday - Returns the time of day in a timespec. | |
322 | * @ts: pointer to the timespec to be set | |
323 | * | |
324 | * Returns the time of day in a timespec (WARN if suspended). | |
325 | */ | |
326 | void getnstimeofday(struct timespec *ts) | |
327 | { | |
328 | WARN_ON(__getnstimeofday(ts)); | |
8524070b | 329 | } |
8524070b JS |
330 | EXPORT_SYMBOL(getnstimeofday); |
331 | ||
951ed4d3 MS |
332 | ktime_t ktime_get(void) |
333 | { | |
4e250fdd | 334 | struct timekeeper *tk = &timekeeper; |
951ed4d3 MS |
335 | unsigned int seq; |
336 | s64 secs, nsecs; | |
337 | ||
338 | WARN_ON(timekeeping_suspended); | |
339 | ||
340 | do { | |
9a7a71b1 | 341 | seq = read_seqcount_begin(&timekeeper_seq); |
4e250fdd JS |
342 | secs = tk->xtime_sec + tk->wall_to_monotonic.tv_sec; |
343 | nsecs = timekeeping_get_ns(tk) + tk->wall_to_monotonic.tv_nsec; | |
951ed4d3 | 344 | |
9a7a71b1 | 345 | } while (read_seqcount_retry(&timekeeper_seq, seq)); |
951ed4d3 MS |
346 | /* |
347 | * Use ktime_set/ktime_add_ns to create a proper ktime on | |
348 | * 32-bit architectures without CONFIG_KTIME_SCALAR. | |
349 | */ | |
350 | return ktime_add_ns(ktime_set(secs, 0), nsecs); | |
351 | } | |
352 | EXPORT_SYMBOL_GPL(ktime_get); | |
353 | ||
354 | /** | |
355 | * ktime_get_ts - get the monotonic clock in timespec format | |
356 | * @ts: pointer to timespec variable | |
357 | * | |
358 | * The function calculates the monotonic clock from the realtime | |
359 | * clock and the wall_to_monotonic offset and stores the result | |
360 | * in normalized timespec format in the variable pointed to by @ts. | |
361 | */ | |
362 | void ktime_get_ts(struct timespec *ts) | |
363 | { | |
4e250fdd | 364 | struct timekeeper *tk = &timekeeper; |
951ed4d3 | 365 | struct timespec tomono; |
ec145bab | 366 | s64 nsec; |
951ed4d3 | 367 | unsigned int seq; |
951ed4d3 MS |
368 | |
369 | WARN_ON(timekeeping_suspended); | |
370 | ||
371 | do { | |
9a7a71b1 | 372 | seq = read_seqcount_begin(&timekeeper_seq); |
4e250fdd | 373 | ts->tv_sec = tk->xtime_sec; |
ec145bab | 374 | nsec = timekeeping_get_ns(tk); |
4e250fdd | 375 | tomono = tk->wall_to_monotonic; |
951ed4d3 | 376 | |
9a7a71b1 | 377 | } while (read_seqcount_retry(&timekeeper_seq, seq)); |
951ed4d3 | 378 | |
ec145bab JS |
379 | ts->tv_sec += tomono.tv_sec; |
380 | ts->tv_nsec = 0; | |
381 | timespec_add_ns(ts, nsec + tomono.tv_nsec); | |
951ed4d3 MS |
382 | } |
383 | EXPORT_SYMBOL_GPL(ktime_get_ts); | |
384 | ||
1ff3c967 JS |
385 | |
386 | /** | |
387 | * timekeeping_clocktai - Returns the TAI time of day in a timespec | |
388 | * @ts: pointer to the timespec to be set | |
389 | * | |
390 | * Returns the time of day in a timespec. | |
391 | */ | |
392 | void timekeeping_clocktai(struct timespec *ts) | |
393 | { | |
394 | struct timekeeper *tk = &timekeeper; | |
395 | unsigned long seq; | |
396 | u64 nsecs; | |
397 | ||
398 | WARN_ON(timekeeping_suspended); | |
399 | ||
400 | do { | |
9a7a71b1 | 401 | seq = read_seqcount_begin(&timekeeper_seq); |
1ff3c967 JS |
402 | |
403 | ts->tv_sec = tk->xtime_sec + tk->tai_offset; | |
404 | nsecs = timekeeping_get_ns(tk); | |
405 | ||
9a7a71b1 | 406 | } while (read_seqcount_retry(&timekeeper_seq, seq)); |
1ff3c967 JS |
407 | |
408 | ts->tv_nsec = 0; | |
409 | timespec_add_ns(ts, nsecs); | |
410 | ||
411 | } | |
412 | EXPORT_SYMBOL(timekeeping_clocktai); | |
413 | ||
414 | ||
90adda98 JS |
415 | /** |
416 | * ktime_get_clocktai - Returns the TAI time of day in a ktime | |
417 | * | |
418 | * Returns the time of day in a ktime. | |
419 | */ | |
420 | ktime_t ktime_get_clocktai(void) | |
421 | { | |
422 | struct timespec ts; | |
423 | ||
424 | timekeeping_clocktai(&ts); | |
425 | return timespec_to_ktime(ts); | |
426 | } | |
427 | EXPORT_SYMBOL(ktime_get_clocktai); | |
428 | ||
e2c18e49 AG |
429 | #ifdef CONFIG_NTP_PPS |
430 | ||
431 | /** | |
432 | * getnstime_raw_and_real - get day and raw monotonic time in timespec format | |
433 | * @ts_raw: pointer to the timespec to be set to raw monotonic time | |
434 | * @ts_real: pointer to the timespec to be set to the time of day | |
435 | * | |
436 | * This function reads both the time of day and raw monotonic time at the | |
437 | * same time atomically and stores the resulting timestamps in timespec | |
438 | * format. | |
439 | */ | |
440 | void getnstime_raw_and_real(struct timespec *ts_raw, struct timespec *ts_real) | |
441 | { | |
4e250fdd | 442 | struct timekeeper *tk = &timekeeper; |
e2c18e49 AG |
443 | unsigned long seq; |
444 | s64 nsecs_raw, nsecs_real; | |
445 | ||
446 | WARN_ON_ONCE(timekeeping_suspended); | |
447 | ||
448 | do { | |
9a7a71b1 | 449 | seq = read_seqcount_begin(&timekeeper_seq); |
e2c18e49 | 450 | |
4e250fdd JS |
451 | *ts_raw = tk->raw_time; |
452 | ts_real->tv_sec = tk->xtime_sec; | |
1e75fa8b | 453 | ts_real->tv_nsec = 0; |
e2c18e49 | 454 | |
4e250fdd JS |
455 | nsecs_raw = timekeeping_get_ns_raw(tk); |
456 | nsecs_real = timekeeping_get_ns(tk); | |
e2c18e49 | 457 | |
9a7a71b1 | 458 | } while (read_seqcount_retry(&timekeeper_seq, seq)); |
e2c18e49 AG |
459 | |
460 | timespec_add_ns(ts_raw, nsecs_raw); | |
461 | timespec_add_ns(ts_real, nsecs_real); | |
462 | } | |
463 | EXPORT_SYMBOL(getnstime_raw_and_real); | |
464 | ||
465 | #endif /* CONFIG_NTP_PPS */ | |
466 | ||
8524070b JS |
467 | /** |
468 | * do_gettimeofday - Returns the time of day in a timeval | |
469 | * @tv: pointer to the timeval to be set | |
470 | * | |
efd9ac86 | 471 | * NOTE: Users should be converted to using getnstimeofday() |
8524070b JS |
472 | */ |
473 | void do_gettimeofday(struct timeval *tv) | |
474 | { | |
475 | struct timespec now; | |
476 | ||
efd9ac86 | 477 | getnstimeofday(&now); |
8524070b JS |
478 | tv->tv_sec = now.tv_sec; |
479 | tv->tv_usec = now.tv_nsec/1000; | |
480 | } | |
8524070b | 481 | EXPORT_SYMBOL(do_gettimeofday); |
d239f49d | 482 | |
8524070b JS |
483 | /** |
484 | * do_settimeofday - Sets the time of day | |
485 | * @tv: pointer to the timespec variable containing the new time | |
486 | * | |
487 | * Sets the time of day to the new time and update NTP and notify hrtimers | |
488 | */ | |
1e6d7679 | 489 | int do_settimeofday(const struct timespec *tv) |
8524070b | 490 | { |
4e250fdd | 491 | struct timekeeper *tk = &timekeeper; |
1e75fa8b | 492 | struct timespec ts_delta, xt; |
92c1d3ed | 493 | unsigned long flags; |
8524070b | 494 | |
cee58483 | 495 | if (!timespec_valid_strict(tv)) |
8524070b JS |
496 | return -EINVAL; |
497 | ||
9a7a71b1 TG |
498 | raw_spin_lock_irqsave(&timekeeper_lock, flags); |
499 | write_seqcount_begin(&timekeeper_seq); | |
8524070b | 500 | |
4e250fdd | 501 | timekeeping_forward_now(tk); |
9a055117 | 502 | |
4e250fdd | 503 | xt = tk_xtime(tk); |
1e75fa8b JS |
504 | ts_delta.tv_sec = tv->tv_sec - xt.tv_sec; |
505 | ts_delta.tv_nsec = tv->tv_nsec - xt.tv_nsec; | |
506 | ||
4e250fdd | 507 | tk_set_wall_to_mono(tk, timespec_sub(tk->wall_to_monotonic, ts_delta)); |
8524070b | 508 | |
4e250fdd | 509 | tk_set_xtime(tk, tv); |
1e75fa8b | 510 | |
48cdc135 | 511 | timekeeping_update(tk, true, true); |
8524070b | 512 | |
9a7a71b1 TG |
513 | write_seqcount_end(&timekeeper_seq); |
514 | raw_spin_unlock_irqrestore(&timekeeper_lock, flags); | |
8524070b JS |
515 | |
516 | /* signal hrtimers about time change */ | |
517 | clock_was_set(); | |
518 | ||
519 | return 0; | |
520 | } | |
8524070b JS |
521 | EXPORT_SYMBOL(do_settimeofday); |
522 | ||
c528f7c6 JS |
523 | /** |
524 | * timekeeping_inject_offset - Adds or subtracts from the current time. | |
525 | * @tv: pointer to the timespec variable containing the offset | |
526 | * | |
527 | * Adds or subtracts an offset value from the current time. | |
528 | */ | |
529 | int timekeeping_inject_offset(struct timespec *ts) | |
530 | { | |
4e250fdd | 531 | struct timekeeper *tk = &timekeeper; |
92c1d3ed | 532 | unsigned long flags; |
4e8b1452 JS |
533 | struct timespec tmp; |
534 | int ret = 0; | |
c528f7c6 JS |
535 | |
536 | if ((unsigned long)ts->tv_nsec >= NSEC_PER_SEC) | |
537 | return -EINVAL; | |
538 | ||
9a7a71b1 TG |
539 | raw_spin_lock_irqsave(&timekeeper_lock, flags); |
540 | write_seqcount_begin(&timekeeper_seq); | |
c528f7c6 | 541 | |
4e250fdd | 542 | timekeeping_forward_now(tk); |
c528f7c6 | 543 | |
4e8b1452 JS |
544 | /* Make sure the proposed value is valid */ |
545 | tmp = timespec_add(tk_xtime(tk), *ts); | |
cee58483 | 546 | if (!timespec_valid_strict(&tmp)) { |
4e8b1452 JS |
547 | ret = -EINVAL; |
548 | goto error; | |
549 | } | |
1e75fa8b | 550 | |
4e250fdd JS |
551 | tk_xtime_add(tk, ts); |
552 | tk_set_wall_to_mono(tk, timespec_sub(tk->wall_to_monotonic, *ts)); | |
c528f7c6 | 553 | |
4e8b1452 | 554 | error: /* even if we error out, we forwarded the time, so call update */ |
48cdc135 | 555 | timekeeping_update(tk, true, true); |
c528f7c6 | 556 | |
9a7a71b1 TG |
557 | write_seqcount_end(&timekeeper_seq); |
558 | raw_spin_unlock_irqrestore(&timekeeper_lock, flags); | |
c528f7c6 JS |
559 | |
560 | /* signal hrtimers about time change */ | |
561 | clock_was_set(); | |
562 | ||
4e8b1452 | 563 | return ret; |
c528f7c6 JS |
564 | } |
565 | EXPORT_SYMBOL(timekeeping_inject_offset); | |
566 | ||
cc244dda JS |
567 | |
568 | /** | |
569 | * timekeeping_get_tai_offset - Returns current TAI offset from UTC | |
570 | * | |
571 | */ | |
572 | s32 timekeeping_get_tai_offset(void) | |
573 | { | |
574 | struct timekeeper *tk = &timekeeper; | |
575 | unsigned int seq; | |
576 | s32 ret; | |
577 | ||
578 | do { | |
9a7a71b1 | 579 | seq = read_seqcount_begin(&timekeeper_seq); |
cc244dda | 580 | ret = tk->tai_offset; |
9a7a71b1 | 581 | } while (read_seqcount_retry(&timekeeper_seq, seq)); |
cc244dda JS |
582 | |
583 | return ret; | |
584 | } | |
585 | ||
586 | /** | |
587 | * __timekeeping_set_tai_offset - Lock free worker function | |
588 | * | |
589 | */ | |
dd5d70e8 | 590 | static void __timekeeping_set_tai_offset(struct timekeeper *tk, s32 tai_offset) |
cc244dda JS |
591 | { |
592 | tk->tai_offset = tai_offset; | |
90adda98 | 593 | tk->offs_tai = ktime_sub(tk->offs_real, ktime_set(tai_offset, 0)); |
cc244dda JS |
594 | } |
595 | ||
596 | /** | |
597 | * timekeeping_set_tai_offset - Sets the current TAI offset from UTC | |
598 | * | |
599 | */ | |
600 | void timekeeping_set_tai_offset(s32 tai_offset) | |
601 | { | |
602 | struct timekeeper *tk = &timekeeper; | |
603 | unsigned long flags; | |
604 | ||
9a7a71b1 TG |
605 | raw_spin_lock_irqsave(&timekeeper_lock, flags); |
606 | write_seqcount_begin(&timekeeper_seq); | |
cc244dda | 607 | __timekeeping_set_tai_offset(tk, tai_offset); |
9a7a71b1 TG |
608 | write_seqcount_end(&timekeeper_seq); |
609 | raw_spin_unlock_irqrestore(&timekeeper_lock, flags); | |
cc244dda JS |
610 | } |
611 | ||
8524070b JS |
612 | /** |
613 | * change_clocksource - Swaps clocksources if a new one is available | |
614 | * | |
615 | * Accumulates current time interval and initializes new clocksource | |
616 | */ | |
75c5158f | 617 | static int change_clocksource(void *data) |
8524070b | 618 | { |
4e250fdd | 619 | struct timekeeper *tk = &timekeeper; |
4614e6ad | 620 | struct clocksource *new, *old; |
f695cf94 | 621 | unsigned long flags; |
8524070b | 622 | |
75c5158f | 623 | new = (struct clocksource *) data; |
8524070b | 624 | |
9a7a71b1 TG |
625 | raw_spin_lock_irqsave(&timekeeper_lock, flags); |
626 | write_seqcount_begin(&timekeeper_seq); | |
f695cf94 | 627 | |
4e250fdd | 628 | timekeeping_forward_now(tk); |
75c5158f | 629 | if (!new->enable || new->enable(new) == 0) { |
4e250fdd JS |
630 | old = tk->clock; |
631 | tk_setup_internals(tk, new); | |
75c5158f MS |
632 | if (old->disable) |
633 | old->disable(old); | |
634 | } | |
48cdc135 | 635 | timekeeping_update(tk, true, true); |
f695cf94 | 636 | |
9a7a71b1 TG |
637 | write_seqcount_end(&timekeeper_seq); |
638 | raw_spin_unlock_irqrestore(&timekeeper_lock, flags); | |
f695cf94 | 639 | |
75c5158f MS |
640 | return 0; |
641 | } | |
8524070b | 642 | |
75c5158f MS |
643 | /** |
644 | * timekeeping_notify - Install a new clock source | |
645 | * @clock: pointer to the clock source | |
646 | * | |
647 | * This function is called from clocksource.c after a new, better clock | |
648 | * source has been registered. The caller holds the clocksource_mutex. | |
649 | */ | |
650 | void timekeeping_notify(struct clocksource *clock) | |
651 | { | |
4e250fdd JS |
652 | struct timekeeper *tk = &timekeeper; |
653 | ||
654 | if (tk->clock == clock) | |
4614e6ad | 655 | return; |
75c5158f | 656 | stop_machine(change_clocksource, clock, NULL); |
8524070b | 657 | tick_clock_notify(); |
8524070b | 658 | } |
75c5158f | 659 | |
a40f262c TG |
660 | /** |
661 | * ktime_get_real - get the real (wall-) time in ktime_t format | |
662 | * | |
663 | * returns the time in ktime_t format | |
664 | */ | |
665 | ktime_t ktime_get_real(void) | |
666 | { | |
667 | struct timespec now; | |
668 | ||
669 | getnstimeofday(&now); | |
670 | ||
671 | return timespec_to_ktime(now); | |
672 | } | |
673 | EXPORT_SYMBOL_GPL(ktime_get_real); | |
8524070b | 674 | |
2d42244a JS |
675 | /** |
676 | * getrawmonotonic - Returns the raw monotonic time in a timespec | |
677 | * @ts: pointer to the timespec to be set | |
678 | * | |
679 | * Returns the raw monotonic time (completely un-modified by ntp) | |
680 | */ | |
681 | void getrawmonotonic(struct timespec *ts) | |
682 | { | |
4e250fdd | 683 | struct timekeeper *tk = &timekeeper; |
2d42244a JS |
684 | unsigned long seq; |
685 | s64 nsecs; | |
2d42244a JS |
686 | |
687 | do { | |
9a7a71b1 | 688 | seq = read_seqcount_begin(&timekeeper_seq); |
4e250fdd JS |
689 | nsecs = timekeeping_get_ns_raw(tk); |
690 | *ts = tk->raw_time; | |
2d42244a | 691 | |
9a7a71b1 | 692 | } while (read_seqcount_retry(&timekeeper_seq, seq)); |
2d42244a JS |
693 | |
694 | timespec_add_ns(ts, nsecs); | |
695 | } | |
696 | EXPORT_SYMBOL(getrawmonotonic); | |
697 | ||
8524070b | 698 | /** |
cf4fc6cb | 699 | * timekeeping_valid_for_hres - Check if timekeeping is suitable for hres |
8524070b | 700 | */ |
cf4fc6cb | 701 | int timekeeping_valid_for_hres(void) |
8524070b | 702 | { |
4e250fdd | 703 | struct timekeeper *tk = &timekeeper; |
8524070b JS |
704 | unsigned long seq; |
705 | int ret; | |
706 | ||
707 | do { | |
9a7a71b1 | 708 | seq = read_seqcount_begin(&timekeeper_seq); |
8524070b | 709 | |
4e250fdd | 710 | ret = tk->clock->flags & CLOCK_SOURCE_VALID_FOR_HRES; |
8524070b | 711 | |
9a7a71b1 | 712 | } while (read_seqcount_retry(&timekeeper_seq, seq)); |
8524070b JS |
713 | |
714 | return ret; | |
715 | } | |
716 | ||
98962465 JH |
717 | /** |
718 | * timekeeping_max_deferment - Returns max time the clocksource can be deferred | |
98962465 JH |
719 | */ |
720 | u64 timekeeping_max_deferment(void) | |
721 | { | |
4e250fdd | 722 | struct timekeeper *tk = &timekeeper; |
70471f2f JS |
723 | unsigned long seq; |
724 | u64 ret; | |
42e71e81 | 725 | |
70471f2f | 726 | do { |
9a7a71b1 | 727 | seq = read_seqcount_begin(&timekeeper_seq); |
70471f2f | 728 | |
4e250fdd | 729 | ret = tk->clock->max_idle_ns; |
70471f2f | 730 | |
9a7a71b1 | 731 | } while (read_seqcount_retry(&timekeeper_seq, seq)); |
70471f2f JS |
732 | |
733 | return ret; | |
98962465 JH |
734 | } |
735 | ||
8524070b | 736 | /** |
d4f587c6 | 737 | * read_persistent_clock - Return time from the persistent clock. |
8524070b JS |
738 | * |
739 | * Weak dummy function for arches that do not yet support it. | |
d4f587c6 MS |
740 | * Reads the time from the battery backed persistent clock. |
741 | * Returns a timespec with tv_sec=0 and tv_nsec=0 if unsupported. | |
8524070b JS |
742 | * |
743 | * XXX - Do be sure to remove it once all arches implement it. | |
744 | */ | |
d4f587c6 | 745 | void __attribute__((weak)) read_persistent_clock(struct timespec *ts) |
8524070b | 746 | { |
d4f587c6 MS |
747 | ts->tv_sec = 0; |
748 | ts->tv_nsec = 0; | |
8524070b JS |
749 | } |
750 | ||
23970e38 MS |
751 | /** |
752 | * read_boot_clock - Return time of the system start. | |
753 | * | |
754 | * Weak dummy function for arches that do not yet support it. | |
755 | * Function to read the exact time the system has been started. | |
756 | * Returns a timespec with tv_sec=0 and tv_nsec=0 if unsupported. | |
757 | * | |
758 | * XXX - Do be sure to remove it once all arches implement it. | |
759 | */ | |
760 | void __attribute__((weak)) read_boot_clock(struct timespec *ts) | |
761 | { | |
762 | ts->tv_sec = 0; | |
763 | ts->tv_nsec = 0; | |
764 | } | |
765 | ||
8524070b JS |
766 | /* |
767 | * timekeeping_init - Initializes the clocksource and common timekeeping values | |
768 | */ | |
769 | void __init timekeeping_init(void) | |
770 | { | |
4e250fdd | 771 | struct timekeeper *tk = &timekeeper; |
155ec602 | 772 | struct clocksource *clock; |
8524070b | 773 | unsigned long flags; |
6d0ef903 | 774 | struct timespec now, boot, tmp; |
d4f587c6 MS |
775 | |
776 | read_persistent_clock(&now); | |
31ade306 | 777 | |
cee58483 | 778 | if (!timespec_valid_strict(&now)) { |
4e8b1452 JS |
779 | pr_warn("WARNING: Persistent clock returned invalid value!\n" |
780 | " Check your CMOS/BIOS settings.\n"); | |
781 | now.tv_sec = 0; | |
782 | now.tv_nsec = 0; | |
31ade306 FT |
783 | } else if (now.tv_sec || now.tv_nsec) |
784 | persistent_clock_exist = true; | |
4e8b1452 | 785 | |
23970e38 | 786 | read_boot_clock(&boot); |
cee58483 | 787 | if (!timespec_valid_strict(&boot)) { |
4e8b1452 JS |
788 | pr_warn("WARNING: Boot clock returned invalid value!\n" |
789 | " Check your CMOS/BIOS settings.\n"); | |
790 | boot.tv_sec = 0; | |
791 | boot.tv_nsec = 0; | |
792 | } | |
8524070b | 793 | |
9a7a71b1 TG |
794 | raw_spin_lock_irqsave(&timekeeper_lock, flags); |
795 | write_seqcount_begin(&timekeeper_seq); | |
06c017fd JS |
796 | ntp_init(); |
797 | ||
f1b82746 | 798 | clock = clocksource_default_clock(); |
a0f7d48b MS |
799 | if (clock->enable) |
800 | clock->enable(clock); | |
4e250fdd | 801 | tk_setup_internals(tk, clock); |
8524070b | 802 | |
4e250fdd JS |
803 | tk_set_xtime(tk, &now); |
804 | tk->raw_time.tv_sec = 0; | |
805 | tk->raw_time.tv_nsec = 0; | |
1e75fa8b | 806 | if (boot.tv_sec == 0 && boot.tv_nsec == 0) |
4e250fdd | 807 | boot = tk_xtime(tk); |
1e75fa8b | 808 | |
6d0ef903 | 809 | set_normalized_timespec(&tmp, -boot.tv_sec, -boot.tv_nsec); |
4e250fdd | 810 | tk_set_wall_to_mono(tk, tmp); |
6d0ef903 JS |
811 | |
812 | tmp.tv_sec = 0; | |
813 | tmp.tv_nsec = 0; | |
4e250fdd | 814 | tk_set_sleep_time(tk, tmp); |
6d0ef903 | 815 | |
48cdc135 TG |
816 | memcpy(&shadow_timekeeper, &timekeeper, sizeof(timekeeper)); |
817 | ||
9a7a71b1 TG |
818 | write_seqcount_end(&timekeeper_seq); |
819 | raw_spin_unlock_irqrestore(&timekeeper_lock, flags); | |
8524070b JS |
820 | } |
821 | ||
8524070b | 822 | /* time in seconds when suspend began */ |
d4f587c6 | 823 | static struct timespec timekeeping_suspend_time; |
8524070b | 824 | |
304529b1 JS |
825 | /** |
826 | * __timekeeping_inject_sleeptime - Internal function to add sleep interval | |
827 | * @delta: pointer to a timespec delta value | |
828 | * | |
829 | * Takes a timespec offset measuring a suspend interval and properly | |
830 | * adds the sleep offset to the timekeeping variables. | |
831 | */ | |
f726a697 JS |
832 | static void __timekeeping_inject_sleeptime(struct timekeeper *tk, |
833 | struct timespec *delta) | |
304529b1 | 834 | { |
cee58483 | 835 | if (!timespec_valid_strict(delta)) { |
cbaa5152 | 836 | printk(KERN_WARNING "__timekeeping_inject_sleeptime: Invalid " |
cb5de2f8 JS |
837 | "sleep delta value!\n"); |
838 | return; | |
839 | } | |
f726a697 | 840 | tk_xtime_add(tk, delta); |
6d0ef903 JS |
841 | tk_set_wall_to_mono(tk, timespec_sub(tk->wall_to_monotonic, *delta)); |
842 | tk_set_sleep_time(tk, timespec_add(tk->total_sleep_time, *delta)); | |
304529b1 JS |
843 | } |
844 | ||
304529b1 JS |
845 | /** |
846 | * timekeeping_inject_sleeptime - Adds suspend interval to timeekeeping values | |
847 | * @delta: pointer to a timespec delta value | |
848 | * | |
849 | * This hook is for architectures that cannot support read_persistent_clock | |
850 | * because their RTC/persistent clock is only accessible when irqs are enabled. | |
851 | * | |
852 | * This function should only be called by rtc_resume(), and allows | |
853 | * a suspend offset to be injected into the timekeeping values. | |
854 | */ | |
855 | void timekeeping_inject_sleeptime(struct timespec *delta) | |
856 | { | |
4e250fdd | 857 | struct timekeeper *tk = &timekeeper; |
92c1d3ed | 858 | unsigned long flags; |
304529b1 | 859 | |
31ade306 FT |
860 | /* |
861 | * Make sure we don't set the clock twice, as timekeeping_resume() | |
862 | * already did it | |
863 | */ | |
864 | if (has_persistent_clock()) | |
304529b1 JS |
865 | return; |
866 | ||
9a7a71b1 TG |
867 | raw_spin_lock_irqsave(&timekeeper_lock, flags); |
868 | write_seqcount_begin(&timekeeper_seq); | |
70471f2f | 869 | |
4e250fdd | 870 | timekeeping_forward_now(tk); |
304529b1 | 871 | |
4e250fdd | 872 | __timekeeping_inject_sleeptime(tk, delta); |
304529b1 | 873 | |
48cdc135 | 874 | timekeeping_update(tk, true, true); |
304529b1 | 875 | |
9a7a71b1 TG |
876 | write_seqcount_end(&timekeeper_seq); |
877 | raw_spin_unlock_irqrestore(&timekeeper_lock, flags); | |
304529b1 JS |
878 | |
879 | /* signal hrtimers about time change */ | |
880 | clock_was_set(); | |
881 | } | |
882 | ||
8524070b JS |
883 | /** |
884 | * timekeeping_resume - Resumes the generic timekeeping subsystem. | |
8524070b JS |
885 | * |
886 | * This is for the generic clocksource timekeeping. | |
887 | * xtime/wall_to_monotonic/jiffies/etc are | |
888 | * still managed by arch specific suspend/resume code. | |
889 | */ | |
e1a85b2c | 890 | static void timekeeping_resume(void) |
8524070b | 891 | { |
4e250fdd | 892 | struct timekeeper *tk = &timekeeper; |
e445cf1c | 893 | struct clocksource *clock = tk->clock; |
92c1d3ed | 894 | unsigned long flags; |
e445cf1c FT |
895 | struct timespec ts_new, ts_delta; |
896 | cycle_t cycle_now, cycle_delta; | |
897 | bool suspendtime_found = false; | |
d4f587c6 | 898 | |
e445cf1c | 899 | read_persistent_clock(&ts_new); |
8524070b | 900 | |
adc78e6b | 901 | clockevents_resume(); |
d10ff3fb TG |
902 | clocksource_resume(); |
903 | ||
9a7a71b1 TG |
904 | raw_spin_lock_irqsave(&timekeeper_lock, flags); |
905 | write_seqcount_begin(&timekeeper_seq); | |
8524070b | 906 | |
e445cf1c FT |
907 | /* |
908 | * After system resumes, we need to calculate the suspended time and | |
909 | * compensate it for the OS time. There are 3 sources that could be | |
910 | * used: Nonstop clocksource during suspend, persistent clock and rtc | |
911 | * device. | |
912 | * | |
913 | * One specific platform may have 1 or 2 or all of them, and the | |
914 | * preference will be: | |
915 | * suspend-nonstop clocksource -> persistent clock -> rtc | |
916 | * The less preferred source will only be tried if there is no better | |
917 | * usable source. The rtc part is handled separately in rtc core code. | |
918 | */ | |
919 | cycle_now = clock->read(clock); | |
920 | if ((clock->flags & CLOCK_SOURCE_SUSPEND_NONSTOP) && | |
921 | cycle_now > clock->cycle_last) { | |
922 | u64 num, max = ULLONG_MAX; | |
923 | u32 mult = clock->mult; | |
924 | u32 shift = clock->shift; | |
925 | s64 nsec = 0; | |
926 | ||
927 | cycle_delta = (cycle_now - clock->cycle_last) & clock->mask; | |
928 | ||
929 | /* | |
930 | * "cycle_delta * mutl" may cause 64 bits overflow, if the | |
931 | * suspended time is too long. In that case we need do the | |
932 | * 64 bits math carefully | |
933 | */ | |
934 | do_div(max, mult); | |
935 | if (cycle_delta > max) { | |
936 | num = div64_u64(cycle_delta, max); | |
937 | nsec = (((u64) max * mult) >> shift) * num; | |
938 | cycle_delta -= num * max; | |
939 | } | |
940 | nsec += ((u64) cycle_delta * mult) >> shift; | |
941 | ||
942 | ts_delta = ns_to_timespec(nsec); | |
943 | suspendtime_found = true; | |
944 | } else if (timespec_compare(&ts_new, &timekeeping_suspend_time) > 0) { | |
945 | ts_delta = timespec_sub(ts_new, timekeeping_suspend_time); | |
946 | suspendtime_found = true; | |
8524070b | 947 | } |
e445cf1c FT |
948 | |
949 | if (suspendtime_found) | |
950 | __timekeeping_inject_sleeptime(tk, &ts_delta); | |
951 | ||
952 | /* Re-base the last cycle value */ | |
953 | clock->cycle_last = cycle_now; | |
4e250fdd | 954 | tk->ntp_error = 0; |
8524070b | 955 | timekeeping_suspended = 0; |
48cdc135 | 956 | timekeeping_update(tk, false, true); |
9a7a71b1 TG |
957 | write_seqcount_end(&timekeeper_seq); |
958 | raw_spin_unlock_irqrestore(&timekeeper_lock, flags); | |
8524070b JS |
959 | |
960 | touch_softlockup_watchdog(); | |
961 | ||
962 | clockevents_notify(CLOCK_EVT_NOTIFY_RESUME, NULL); | |
963 | ||
964 | /* Resume hrtimers */ | |
b12a03ce | 965 | hrtimers_resume(); |
8524070b JS |
966 | } |
967 | ||
e1a85b2c | 968 | static int timekeeping_suspend(void) |
8524070b | 969 | { |
4e250fdd | 970 | struct timekeeper *tk = &timekeeper; |
92c1d3ed | 971 | unsigned long flags; |
cb33217b JS |
972 | struct timespec delta, delta_delta; |
973 | static struct timespec old_delta; | |
8524070b | 974 | |
d4f587c6 | 975 | read_persistent_clock(&timekeeping_suspend_time); |
3be90950 | 976 | |
9a7a71b1 TG |
977 | raw_spin_lock_irqsave(&timekeeper_lock, flags); |
978 | write_seqcount_begin(&timekeeper_seq); | |
4e250fdd | 979 | timekeeping_forward_now(tk); |
8524070b | 980 | timekeeping_suspended = 1; |
cb33217b JS |
981 | |
982 | /* | |
983 | * To avoid drift caused by repeated suspend/resumes, | |
984 | * which each can add ~1 second drift error, | |
985 | * try to compensate so the difference in system time | |
986 | * and persistent_clock time stays close to constant. | |
987 | */ | |
4e250fdd | 988 | delta = timespec_sub(tk_xtime(tk), timekeeping_suspend_time); |
cb33217b JS |
989 | delta_delta = timespec_sub(delta, old_delta); |
990 | if (abs(delta_delta.tv_sec) >= 2) { | |
991 | /* | |
992 | * if delta_delta is too large, assume time correction | |
993 | * has occured and set old_delta to the current delta. | |
994 | */ | |
995 | old_delta = delta; | |
996 | } else { | |
997 | /* Otherwise try to adjust old_system to compensate */ | |
998 | timekeeping_suspend_time = | |
999 | timespec_add(timekeeping_suspend_time, delta_delta); | |
1000 | } | |
9a7a71b1 TG |
1001 | write_seqcount_end(&timekeeper_seq); |
1002 | raw_spin_unlock_irqrestore(&timekeeper_lock, flags); | |
8524070b JS |
1003 | |
1004 | clockevents_notify(CLOCK_EVT_NOTIFY_SUSPEND, NULL); | |
c54a42b1 | 1005 | clocksource_suspend(); |
adc78e6b | 1006 | clockevents_suspend(); |
8524070b JS |
1007 | |
1008 | return 0; | |
1009 | } | |
1010 | ||
1011 | /* sysfs resume/suspend bits for timekeeping */ | |
e1a85b2c | 1012 | static struct syscore_ops timekeeping_syscore_ops = { |
8524070b JS |
1013 | .resume = timekeeping_resume, |
1014 | .suspend = timekeeping_suspend, | |
8524070b JS |
1015 | }; |
1016 | ||
e1a85b2c | 1017 | static int __init timekeeping_init_ops(void) |
8524070b | 1018 | { |
e1a85b2c RW |
1019 | register_syscore_ops(&timekeeping_syscore_ops); |
1020 | return 0; | |
8524070b JS |
1021 | } |
1022 | ||
e1a85b2c | 1023 | device_initcall(timekeeping_init_ops); |
8524070b JS |
1024 | |
1025 | /* | |
1026 | * If the error is already larger, we look ahead even further | |
1027 | * to compensate for late or lost adjustments. | |
1028 | */ | |
f726a697 JS |
1029 | static __always_inline int timekeeping_bigadjust(struct timekeeper *tk, |
1030 | s64 error, s64 *interval, | |
8524070b JS |
1031 | s64 *offset) |
1032 | { | |
1033 | s64 tick_error, i; | |
1034 | u32 look_ahead, adj; | |
1035 | s32 error2, mult; | |
1036 | ||
1037 | /* | |
1038 | * Use the current error value to determine how much to look ahead. | |
1039 | * The larger the error the slower we adjust for it to avoid problems | |
1040 | * with losing too many ticks, otherwise we would overadjust and | |
1041 | * produce an even larger error. The smaller the adjustment the | |
1042 | * faster we try to adjust for it, as lost ticks can do less harm | |
3eb05676 | 1043 | * here. This is tuned so that an error of about 1 msec is adjusted |
8524070b JS |
1044 | * within about 1 sec (or 2^20 nsec in 2^SHIFT_HZ ticks). |
1045 | */ | |
f726a697 | 1046 | error2 = tk->ntp_error >> (NTP_SCALE_SHIFT + 22 - 2 * SHIFT_HZ); |
8524070b JS |
1047 | error2 = abs(error2); |
1048 | for (look_ahead = 0; error2 > 0; look_ahead++) | |
1049 | error2 >>= 2; | |
1050 | ||
1051 | /* | |
1052 | * Now calculate the error in (1 << look_ahead) ticks, but first | |
1053 | * remove the single look ahead already included in the error. | |
1054 | */ | |
f726a697 JS |
1055 | tick_error = ntp_tick_length() >> (tk->ntp_error_shift + 1); |
1056 | tick_error -= tk->xtime_interval >> 1; | |
8524070b JS |
1057 | error = ((error - tick_error) >> look_ahead) + tick_error; |
1058 | ||
1059 | /* Finally calculate the adjustment shift value. */ | |
1060 | i = *interval; | |
1061 | mult = 1; | |
1062 | if (error < 0) { | |
1063 | error = -error; | |
1064 | *interval = -*interval; | |
1065 | *offset = -*offset; | |
1066 | mult = -1; | |
1067 | } | |
1068 | for (adj = 0; error > i; adj++) | |
1069 | error >>= 1; | |
1070 | ||
1071 | *interval <<= adj; | |
1072 | *offset <<= adj; | |
1073 | return mult << adj; | |
1074 | } | |
1075 | ||
1076 | /* | |
1077 | * Adjust the multiplier to reduce the error value, | |
1078 | * this is optimized for the most common adjustments of -1,0,1, | |
1079 | * for other values we can do a bit more work. | |
1080 | */ | |
f726a697 | 1081 | static void timekeeping_adjust(struct timekeeper *tk, s64 offset) |
8524070b | 1082 | { |
f726a697 | 1083 | s64 error, interval = tk->cycle_interval; |
8524070b JS |
1084 | int adj; |
1085 | ||
c2bc1111 | 1086 | /* |
88b28adf | 1087 | * The point of this is to check if the error is greater than half |
c2bc1111 JS |
1088 | * an interval. |
1089 | * | |
1090 | * First we shift it down from NTP_SHIFT to clocksource->shifted nsecs. | |
1091 | * | |
1092 | * Note we subtract one in the shift, so that error is really error*2. | |
3f86f28f JS |
1093 | * This "saves" dividing(shifting) interval twice, but keeps the |
1094 | * (error > interval) comparison as still measuring if error is | |
88b28adf | 1095 | * larger than half an interval. |
c2bc1111 | 1096 | * |
3f86f28f | 1097 | * Note: It does not "save" on aggravation when reading the code. |
c2bc1111 | 1098 | */ |
f726a697 | 1099 | error = tk->ntp_error >> (tk->ntp_error_shift - 1); |
8524070b | 1100 | if (error > interval) { |
c2bc1111 JS |
1101 | /* |
1102 | * We now divide error by 4(via shift), which checks if | |
88b28adf | 1103 | * the error is greater than twice the interval. |
c2bc1111 JS |
1104 | * If it is greater, we need a bigadjust, if its smaller, |
1105 | * we can adjust by 1. | |
1106 | */ | |
8524070b | 1107 | error >>= 2; |
c2bc1111 JS |
1108 | /* |
1109 | * XXX - In update_wall_time, we round up to the next | |
1110 | * nanosecond, and store the amount rounded up into | |
1111 | * the error. This causes the likely below to be unlikely. | |
1112 | * | |
3f86f28f | 1113 | * The proper fix is to avoid rounding up by using |
4e250fdd | 1114 | * the high precision tk->xtime_nsec instead of |
c2bc1111 JS |
1115 | * xtime.tv_nsec everywhere. Fixing this will take some |
1116 | * time. | |
1117 | */ | |
8524070b JS |
1118 | if (likely(error <= interval)) |
1119 | adj = 1; | |
1120 | else | |
1d17d174 IM |
1121 | adj = timekeeping_bigadjust(tk, error, &interval, &offset); |
1122 | } else { | |
1123 | if (error < -interval) { | |
1124 | /* See comment above, this is just switched for the negative */ | |
1125 | error >>= 2; | |
1126 | if (likely(error >= -interval)) { | |
1127 | adj = -1; | |
1128 | interval = -interval; | |
1129 | offset = -offset; | |
1130 | } else { | |
1131 | adj = timekeeping_bigadjust(tk, error, &interval, &offset); | |
1132 | } | |
1133 | } else { | |
1134 | goto out_adjust; | |
1135 | } | |
1136 | } | |
8524070b | 1137 | |
f726a697 JS |
1138 | if (unlikely(tk->clock->maxadj && |
1139 | (tk->mult + adj > tk->clock->mult + tk->clock->maxadj))) { | |
e919cfd4 JS |
1140 | printk_once(KERN_WARNING |
1141 | "Adjusting %s more than 11%% (%ld vs %ld)\n", | |
f726a697 JS |
1142 | tk->clock->name, (long)tk->mult + adj, |
1143 | (long)tk->clock->mult + tk->clock->maxadj); | |
e919cfd4 | 1144 | } |
c2bc1111 JS |
1145 | /* |
1146 | * So the following can be confusing. | |
1147 | * | |
1148 | * To keep things simple, lets assume adj == 1 for now. | |
1149 | * | |
1150 | * When adj != 1, remember that the interval and offset values | |
1151 | * have been appropriately scaled so the math is the same. | |
1152 | * | |
1153 | * The basic idea here is that we're increasing the multiplier | |
1154 | * by one, this causes the xtime_interval to be incremented by | |
1155 | * one cycle_interval. This is because: | |
1156 | * xtime_interval = cycle_interval * mult | |
1157 | * So if mult is being incremented by one: | |
1158 | * xtime_interval = cycle_interval * (mult + 1) | |
1159 | * Its the same as: | |
1160 | * xtime_interval = (cycle_interval * mult) + cycle_interval | |
1161 | * Which can be shortened to: | |
1162 | * xtime_interval += cycle_interval | |
1163 | * | |
1164 | * So offset stores the non-accumulated cycles. Thus the current | |
1165 | * time (in shifted nanoseconds) is: | |
1166 | * now = (offset * adj) + xtime_nsec | |
1167 | * Now, even though we're adjusting the clock frequency, we have | |
1168 | * to keep time consistent. In other words, we can't jump back | |
1169 | * in time, and we also want to avoid jumping forward in time. | |
1170 | * | |
1171 | * So given the same offset value, we need the time to be the same | |
1172 | * both before and after the freq adjustment. | |
1173 | * now = (offset * adj_1) + xtime_nsec_1 | |
1174 | * now = (offset * adj_2) + xtime_nsec_2 | |
1175 | * So: | |
1176 | * (offset * adj_1) + xtime_nsec_1 = | |
1177 | * (offset * adj_2) + xtime_nsec_2 | |
1178 | * And we know: | |
1179 | * adj_2 = adj_1 + 1 | |
1180 | * So: | |
1181 | * (offset * adj_1) + xtime_nsec_1 = | |
1182 | * (offset * (adj_1+1)) + xtime_nsec_2 | |
1183 | * (offset * adj_1) + xtime_nsec_1 = | |
1184 | * (offset * adj_1) + offset + xtime_nsec_2 | |
1185 | * Canceling the sides: | |
1186 | * xtime_nsec_1 = offset + xtime_nsec_2 | |
1187 | * Which gives us: | |
1188 | * xtime_nsec_2 = xtime_nsec_1 - offset | |
1189 | * Which simplfies to: | |
1190 | * xtime_nsec -= offset | |
1191 | * | |
1192 | * XXX - TODO: Doc ntp_error calculation. | |
1193 | */ | |
f726a697 JS |
1194 | tk->mult += adj; |
1195 | tk->xtime_interval += interval; | |
1196 | tk->xtime_nsec -= offset; | |
1197 | tk->ntp_error -= (interval - offset) << tk->ntp_error_shift; | |
2a8c0883 | 1198 | |
1d17d174 | 1199 | out_adjust: |
2a8c0883 JS |
1200 | /* |
1201 | * It may be possible that when we entered this function, xtime_nsec | |
1202 | * was very small. Further, if we're slightly speeding the clocksource | |
1203 | * in the code above, its possible the required corrective factor to | |
1204 | * xtime_nsec could cause it to underflow. | |
1205 | * | |
1206 | * Now, since we already accumulated the second, cannot simply roll | |
1207 | * the accumulated second back, since the NTP subsystem has been | |
1208 | * notified via second_overflow. So instead we push xtime_nsec forward | |
1209 | * by the amount we underflowed, and add that amount into the error. | |
1210 | * | |
1211 | * We'll correct this error next time through this function, when | |
1212 | * xtime_nsec is not as small. | |
1213 | */ | |
f726a697 JS |
1214 | if (unlikely((s64)tk->xtime_nsec < 0)) { |
1215 | s64 neg = -(s64)tk->xtime_nsec; | |
1216 | tk->xtime_nsec = 0; | |
1217 | tk->ntp_error += neg << tk->ntp_error_shift; | |
2a8c0883 JS |
1218 | } |
1219 | ||
8524070b JS |
1220 | } |
1221 | ||
1f4f9487 JS |
1222 | /** |
1223 | * accumulate_nsecs_to_secs - Accumulates nsecs into secs | |
1224 | * | |
1225 | * Helper function that accumulates a the nsecs greater then a second | |
1226 | * from the xtime_nsec field to the xtime_secs field. | |
1227 | * It also calls into the NTP code to handle leapsecond processing. | |
1228 | * | |
1229 | */ | |
1230 | static inline void accumulate_nsecs_to_secs(struct timekeeper *tk) | |
1231 | { | |
1232 | u64 nsecps = (u64)NSEC_PER_SEC << tk->shift; | |
1233 | ||
1234 | while (tk->xtime_nsec >= nsecps) { | |
1235 | int leap; | |
1236 | ||
1237 | tk->xtime_nsec -= nsecps; | |
1238 | tk->xtime_sec++; | |
1239 | ||
1240 | /* Figure out if its a leap sec and apply if needed */ | |
1241 | leap = second_overflow(tk->xtime_sec); | |
6d0ef903 JS |
1242 | if (unlikely(leap)) { |
1243 | struct timespec ts; | |
1244 | ||
1245 | tk->xtime_sec += leap; | |
1f4f9487 | 1246 | |
6d0ef903 JS |
1247 | ts.tv_sec = leap; |
1248 | ts.tv_nsec = 0; | |
1249 | tk_set_wall_to_mono(tk, | |
1250 | timespec_sub(tk->wall_to_monotonic, ts)); | |
1251 | ||
cc244dda JS |
1252 | __timekeeping_set_tai_offset(tk, tk->tai_offset - leap); |
1253 | ||
6d0ef903 JS |
1254 | clock_was_set_delayed(); |
1255 | } | |
1f4f9487 JS |
1256 | } |
1257 | } | |
1258 | ||
a092ff0f JS |
1259 | /** |
1260 | * logarithmic_accumulation - shifted accumulation of cycles | |
1261 | * | |
1262 | * This functions accumulates a shifted interval of cycles into | |
1263 | * into a shifted interval nanoseconds. Allows for O(log) accumulation | |
1264 | * loop. | |
1265 | * | |
1266 | * Returns the unconsumed cycles. | |
1267 | */ | |
f726a697 JS |
1268 | static cycle_t logarithmic_accumulation(struct timekeeper *tk, cycle_t offset, |
1269 | u32 shift) | |
a092ff0f | 1270 | { |
23a9537a | 1271 | cycle_t interval = tk->cycle_interval << shift; |
deda2e81 | 1272 | u64 raw_nsecs; |
a092ff0f | 1273 | |
f726a697 | 1274 | /* If the offset is smaller then a shifted interval, do nothing */ |
23a9537a | 1275 | if (offset < interval) |
a092ff0f JS |
1276 | return offset; |
1277 | ||
1278 | /* Accumulate one shifted interval */ | |
23a9537a | 1279 | offset -= interval; |
7ec98e15 | 1280 | tk->cycle_last += interval; |
a092ff0f | 1281 | |
f726a697 JS |
1282 | tk->xtime_nsec += tk->xtime_interval << shift; |
1283 | accumulate_nsecs_to_secs(tk); | |
a092ff0f | 1284 | |
deda2e81 | 1285 | /* Accumulate raw time */ |
5b3900cd | 1286 | raw_nsecs = (u64)tk->raw_interval << shift; |
f726a697 | 1287 | raw_nsecs += tk->raw_time.tv_nsec; |
c7dcf87a JS |
1288 | if (raw_nsecs >= NSEC_PER_SEC) { |
1289 | u64 raw_secs = raw_nsecs; | |
1290 | raw_nsecs = do_div(raw_secs, NSEC_PER_SEC); | |
f726a697 | 1291 | tk->raw_time.tv_sec += raw_secs; |
a092ff0f | 1292 | } |
f726a697 | 1293 | tk->raw_time.tv_nsec = raw_nsecs; |
a092ff0f JS |
1294 | |
1295 | /* Accumulate error between NTP and clock interval */ | |
f726a697 JS |
1296 | tk->ntp_error += ntp_tick_length() << shift; |
1297 | tk->ntp_error -= (tk->xtime_interval + tk->xtime_remainder) << | |
1298 | (tk->ntp_error_shift + shift); | |
a092ff0f JS |
1299 | |
1300 | return offset; | |
1301 | } | |
1302 | ||
92bb1fcf JS |
1303 | #ifdef CONFIG_GENERIC_TIME_VSYSCALL_OLD |
1304 | static inline void old_vsyscall_fixup(struct timekeeper *tk) | |
1305 | { | |
1306 | s64 remainder; | |
1307 | ||
1308 | /* | |
1309 | * Store only full nanoseconds into xtime_nsec after rounding | |
1310 | * it up and add the remainder to the error difference. | |
1311 | * XXX - This is necessary to avoid small 1ns inconsistnecies caused | |
1312 | * by truncating the remainder in vsyscalls. However, it causes | |
1313 | * additional work to be done in timekeeping_adjust(). Once | |
1314 | * the vsyscall implementations are converted to use xtime_nsec | |
1315 | * (shifted nanoseconds), and CONFIG_GENERIC_TIME_VSYSCALL_OLD | |
1316 | * users are removed, this can be killed. | |
1317 | */ | |
1318 | remainder = tk->xtime_nsec & ((1ULL << tk->shift) - 1); | |
1319 | tk->xtime_nsec -= remainder; | |
1320 | tk->xtime_nsec += 1ULL << tk->shift; | |
1321 | tk->ntp_error += remainder << tk->ntp_error_shift; | |
1322 | ||
1323 | } | |
1324 | #else | |
1325 | #define old_vsyscall_fixup(tk) | |
1326 | #endif | |
1327 | ||
1328 | ||
1329 | ||
8524070b JS |
1330 | /** |
1331 | * update_wall_time - Uses the current clocksource to increment the wall time | |
1332 | * | |
8524070b | 1333 | */ |
871cf1e5 | 1334 | static void update_wall_time(void) |
8524070b | 1335 | { |
155ec602 | 1336 | struct clocksource *clock; |
48cdc135 TG |
1337 | struct timekeeper *real_tk = &timekeeper; |
1338 | struct timekeeper *tk = &shadow_timekeeper; | |
8524070b | 1339 | cycle_t offset; |
a092ff0f | 1340 | int shift = 0, maxshift; |
70471f2f JS |
1341 | unsigned long flags; |
1342 | ||
9a7a71b1 | 1343 | raw_spin_lock_irqsave(&timekeeper_lock, flags); |
8524070b JS |
1344 | |
1345 | /* Make sure we're fully resumed: */ | |
1346 | if (unlikely(timekeeping_suspended)) | |
70471f2f | 1347 | goto out; |
8524070b | 1348 | |
48cdc135 | 1349 | clock = real_tk->clock; |
592913ec JS |
1350 | |
1351 | #ifdef CONFIG_ARCH_USES_GETTIMEOFFSET | |
48cdc135 | 1352 | offset = real_tk->cycle_interval; |
592913ec JS |
1353 | #else |
1354 | offset = (clock->read(clock) - clock->cycle_last) & clock->mask; | |
8524070b | 1355 | #endif |
8524070b | 1356 | |
bf2ac312 | 1357 | /* Check if there's really nothing to do */ |
48cdc135 | 1358 | if (offset < real_tk->cycle_interval) |
bf2ac312 JS |
1359 | goto out; |
1360 | ||
a092ff0f JS |
1361 | /* |
1362 | * With NO_HZ we may have to accumulate many cycle_intervals | |
1363 | * (think "ticks") worth of time at once. To do this efficiently, | |
1364 | * we calculate the largest doubling multiple of cycle_intervals | |
88b28adf | 1365 | * that is smaller than the offset. We then accumulate that |
a092ff0f JS |
1366 | * chunk in one go, and then try to consume the next smaller |
1367 | * doubled multiple. | |
8524070b | 1368 | */ |
4e250fdd | 1369 | shift = ilog2(offset) - ilog2(tk->cycle_interval); |
a092ff0f | 1370 | shift = max(0, shift); |
88b28adf | 1371 | /* Bound shift to one less than what overflows tick_length */ |
ea7cf49a | 1372 | maxshift = (64 - (ilog2(ntp_tick_length())+1)) - 1; |
a092ff0f | 1373 | shift = min(shift, maxshift); |
4e250fdd JS |
1374 | while (offset >= tk->cycle_interval) { |
1375 | offset = logarithmic_accumulation(tk, offset, shift); | |
1376 | if (offset < tk->cycle_interval<<shift) | |
830ec045 | 1377 | shift--; |
8524070b JS |
1378 | } |
1379 | ||
1380 | /* correct the clock when NTP error is too big */ | |
4e250fdd | 1381 | timekeeping_adjust(tk, offset); |
8524070b | 1382 | |
6a867a39 | 1383 | /* |
92bb1fcf JS |
1384 | * XXX This can be killed once everyone converts |
1385 | * to the new update_vsyscall. | |
1386 | */ | |
1387 | old_vsyscall_fixup(tk); | |
8524070b | 1388 | |
6a867a39 JS |
1389 | /* |
1390 | * Finally, make sure that after the rounding | |
1e75fa8b | 1391 | * xtime_nsec isn't larger than NSEC_PER_SEC |
6a867a39 | 1392 | */ |
4e250fdd | 1393 | accumulate_nsecs_to_secs(tk); |
83f57a11 | 1394 | |
ca4523cd | 1395 | write_seqcount_begin(&timekeeper_seq); |
7ec98e15 TG |
1396 | /* Update clock->cycle_last with the new value */ |
1397 | clock->cycle_last = tk->cycle_last; | |
48cdc135 TG |
1398 | /* |
1399 | * Update the real timekeeper. | |
1400 | * | |
1401 | * We could avoid this memcpy by switching pointers, but that | |
1402 | * requires changes to all other timekeeper usage sites as | |
1403 | * well, i.e. move the timekeeper pointer getter into the | |
1404 | * spinlocked/seqcount protected sections. And we trade this | |
1405 | * memcpy under the timekeeper_seq against one before we start | |
1406 | * updating. | |
1407 | */ | |
1408 | memcpy(real_tk, tk, sizeof(*tk)); | |
1409 | timekeeping_update(real_tk, false, false); | |
9a7a71b1 | 1410 | write_seqcount_end(&timekeeper_seq); |
ca4523cd | 1411 | out: |
9a7a71b1 | 1412 | raw_spin_unlock_irqrestore(&timekeeper_lock, flags); |
8524070b | 1413 | } |
7c3f1a57 TJ |
1414 | |
1415 | /** | |
1416 | * getboottime - Return the real time of system boot. | |
1417 | * @ts: pointer to the timespec to be set | |
1418 | * | |
abb3a4ea | 1419 | * Returns the wall-time of boot in a timespec. |
7c3f1a57 TJ |
1420 | * |
1421 | * This is based on the wall_to_monotonic offset and the total suspend | |
1422 | * time. Calls to settimeofday will affect the value returned (which | |
1423 | * basically means that however wrong your real time clock is at boot time, | |
1424 | * you get the right time here). | |
1425 | */ | |
1426 | void getboottime(struct timespec *ts) | |
1427 | { | |
4e250fdd | 1428 | struct timekeeper *tk = &timekeeper; |
36d47481 | 1429 | struct timespec boottime = { |
4e250fdd JS |
1430 | .tv_sec = tk->wall_to_monotonic.tv_sec + |
1431 | tk->total_sleep_time.tv_sec, | |
1432 | .tv_nsec = tk->wall_to_monotonic.tv_nsec + | |
1433 | tk->total_sleep_time.tv_nsec | |
36d47481 | 1434 | }; |
d4f587c6 | 1435 | |
d4f587c6 | 1436 | set_normalized_timespec(ts, -boottime.tv_sec, -boottime.tv_nsec); |
7c3f1a57 | 1437 | } |
c93d89f3 | 1438 | EXPORT_SYMBOL_GPL(getboottime); |
7c3f1a57 | 1439 | |
abb3a4ea JS |
1440 | /** |
1441 | * get_monotonic_boottime - Returns monotonic time since boot | |
1442 | * @ts: pointer to the timespec to be set | |
1443 | * | |
1444 | * Returns the monotonic time since boot in a timespec. | |
1445 | * | |
1446 | * This is similar to CLOCK_MONTONIC/ktime_get_ts, but also | |
1447 | * includes the time spent in suspend. | |
1448 | */ | |
1449 | void get_monotonic_boottime(struct timespec *ts) | |
1450 | { | |
4e250fdd | 1451 | struct timekeeper *tk = &timekeeper; |
abb3a4ea | 1452 | struct timespec tomono, sleep; |
ec145bab | 1453 | s64 nsec; |
abb3a4ea | 1454 | unsigned int seq; |
abb3a4ea JS |
1455 | |
1456 | WARN_ON(timekeeping_suspended); | |
1457 | ||
1458 | do { | |
9a7a71b1 | 1459 | seq = read_seqcount_begin(&timekeeper_seq); |
4e250fdd | 1460 | ts->tv_sec = tk->xtime_sec; |
ec145bab | 1461 | nsec = timekeeping_get_ns(tk); |
4e250fdd JS |
1462 | tomono = tk->wall_to_monotonic; |
1463 | sleep = tk->total_sleep_time; | |
abb3a4ea | 1464 | |
9a7a71b1 | 1465 | } while (read_seqcount_retry(&timekeeper_seq, seq)); |
abb3a4ea | 1466 | |
ec145bab JS |
1467 | ts->tv_sec += tomono.tv_sec + sleep.tv_sec; |
1468 | ts->tv_nsec = 0; | |
1469 | timespec_add_ns(ts, nsec + tomono.tv_nsec + sleep.tv_nsec); | |
abb3a4ea JS |
1470 | } |
1471 | EXPORT_SYMBOL_GPL(get_monotonic_boottime); | |
1472 | ||
1473 | /** | |
1474 | * ktime_get_boottime - Returns monotonic time since boot in a ktime | |
1475 | * | |
1476 | * Returns the monotonic time since boot in a ktime | |
1477 | * | |
1478 | * This is similar to CLOCK_MONTONIC/ktime_get, but also | |
1479 | * includes the time spent in suspend. | |
1480 | */ | |
1481 | ktime_t ktime_get_boottime(void) | |
1482 | { | |
1483 | struct timespec ts; | |
1484 | ||
1485 | get_monotonic_boottime(&ts); | |
1486 | return timespec_to_ktime(ts); | |
1487 | } | |
1488 | EXPORT_SYMBOL_GPL(ktime_get_boottime); | |
1489 | ||
7c3f1a57 TJ |
1490 | /** |
1491 | * monotonic_to_bootbased - Convert the monotonic time to boot based. | |
1492 | * @ts: pointer to the timespec to be converted | |
1493 | */ | |
1494 | void monotonic_to_bootbased(struct timespec *ts) | |
1495 | { | |
4e250fdd JS |
1496 | struct timekeeper *tk = &timekeeper; |
1497 | ||
1498 | *ts = timespec_add(*ts, tk->total_sleep_time); | |
7c3f1a57 | 1499 | } |
c93d89f3 | 1500 | EXPORT_SYMBOL_GPL(monotonic_to_bootbased); |
2c6b47de | 1501 | |
17c38b74 JS |
1502 | unsigned long get_seconds(void) |
1503 | { | |
4e250fdd JS |
1504 | struct timekeeper *tk = &timekeeper; |
1505 | ||
1506 | return tk->xtime_sec; | |
17c38b74 JS |
1507 | } |
1508 | EXPORT_SYMBOL(get_seconds); | |
1509 | ||
da15cfda JS |
1510 | struct timespec __current_kernel_time(void) |
1511 | { | |
4e250fdd JS |
1512 | struct timekeeper *tk = &timekeeper; |
1513 | ||
1514 | return tk_xtime(tk); | |
da15cfda | 1515 | } |
17c38b74 | 1516 | |
2c6b47de JS |
1517 | struct timespec current_kernel_time(void) |
1518 | { | |
4e250fdd | 1519 | struct timekeeper *tk = &timekeeper; |
2c6b47de JS |
1520 | struct timespec now; |
1521 | unsigned long seq; | |
1522 | ||
1523 | do { | |
9a7a71b1 | 1524 | seq = read_seqcount_begin(&timekeeper_seq); |
83f57a11 | 1525 | |
4e250fdd | 1526 | now = tk_xtime(tk); |
9a7a71b1 | 1527 | } while (read_seqcount_retry(&timekeeper_seq, seq)); |
2c6b47de JS |
1528 | |
1529 | return now; | |
1530 | } | |
2c6b47de | 1531 | EXPORT_SYMBOL(current_kernel_time); |
da15cfda JS |
1532 | |
1533 | struct timespec get_monotonic_coarse(void) | |
1534 | { | |
4e250fdd | 1535 | struct timekeeper *tk = &timekeeper; |
da15cfda JS |
1536 | struct timespec now, mono; |
1537 | unsigned long seq; | |
1538 | ||
1539 | do { | |
9a7a71b1 | 1540 | seq = read_seqcount_begin(&timekeeper_seq); |
83f57a11 | 1541 | |
4e250fdd JS |
1542 | now = tk_xtime(tk); |
1543 | mono = tk->wall_to_monotonic; | |
9a7a71b1 | 1544 | } while (read_seqcount_retry(&timekeeper_seq, seq)); |
da15cfda JS |
1545 | |
1546 | set_normalized_timespec(&now, now.tv_sec + mono.tv_sec, | |
1547 | now.tv_nsec + mono.tv_nsec); | |
1548 | return now; | |
1549 | } | |
871cf1e5 TH |
1550 | |
1551 | /* | |
d6ad4187 | 1552 | * Must hold jiffies_lock |
871cf1e5 TH |
1553 | */ |
1554 | void do_timer(unsigned long ticks) | |
1555 | { | |
1556 | jiffies_64 += ticks; | |
1557 | update_wall_time(); | |
1558 | calc_global_load(ticks); | |
1559 | } | |
48cf76f7 TH |
1560 | |
1561 | /** | |
314ac371 JS |
1562 | * get_xtime_and_monotonic_and_sleep_offset() - get xtime, wall_to_monotonic, |
1563 | * and sleep offsets. | |
48cf76f7 TH |
1564 | * @xtim: pointer to timespec to be set with xtime |
1565 | * @wtom: pointer to timespec to be set with wall_to_monotonic | |
314ac371 | 1566 | * @sleep: pointer to timespec to be set with time in suspend |
48cf76f7 | 1567 | */ |
314ac371 JS |
1568 | void get_xtime_and_monotonic_and_sleep_offset(struct timespec *xtim, |
1569 | struct timespec *wtom, struct timespec *sleep) | |
48cf76f7 | 1570 | { |
4e250fdd | 1571 | struct timekeeper *tk = &timekeeper; |
48cf76f7 TH |
1572 | unsigned long seq; |
1573 | ||
1574 | do { | |
9a7a71b1 | 1575 | seq = read_seqcount_begin(&timekeeper_seq); |
4e250fdd JS |
1576 | *xtim = tk_xtime(tk); |
1577 | *wtom = tk->wall_to_monotonic; | |
1578 | *sleep = tk->total_sleep_time; | |
9a7a71b1 | 1579 | } while (read_seqcount_retry(&timekeeper_seq, seq)); |
48cf76f7 | 1580 | } |
f0af911a | 1581 | |
f6c06abf TG |
1582 | #ifdef CONFIG_HIGH_RES_TIMERS |
1583 | /** | |
1584 | * ktime_get_update_offsets - hrtimer helper | |
1585 | * @offs_real: pointer to storage for monotonic -> realtime offset | |
1586 | * @offs_boot: pointer to storage for monotonic -> boottime offset | |
1587 | * | |
1588 | * Returns current monotonic time and updates the offsets | |
1589 | * Called from hrtimer_interupt() or retrigger_next_event() | |
1590 | */ | |
90adda98 JS |
1591 | ktime_t ktime_get_update_offsets(ktime_t *offs_real, ktime_t *offs_boot, |
1592 | ktime_t *offs_tai) | |
f6c06abf | 1593 | { |
4e250fdd | 1594 | struct timekeeper *tk = &timekeeper; |
f6c06abf TG |
1595 | ktime_t now; |
1596 | unsigned int seq; | |
1597 | u64 secs, nsecs; | |
1598 | ||
1599 | do { | |
9a7a71b1 | 1600 | seq = read_seqcount_begin(&timekeeper_seq); |
f6c06abf | 1601 | |
4e250fdd JS |
1602 | secs = tk->xtime_sec; |
1603 | nsecs = timekeeping_get_ns(tk); | |
f6c06abf | 1604 | |
4e250fdd JS |
1605 | *offs_real = tk->offs_real; |
1606 | *offs_boot = tk->offs_boot; | |
90adda98 | 1607 | *offs_tai = tk->offs_tai; |
9a7a71b1 | 1608 | } while (read_seqcount_retry(&timekeeper_seq, seq)); |
f6c06abf TG |
1609 | |
1610 | now = ktime_add_ns(ktime_set(secs, 0), nsecs); | |
1611 | now = ktime_sub(now, *offs_real); | |
1612 | return now; | |
1613 | } | |
1614 | #endif | |
1615 | ||
99ee5315 TG |
1616 | /** |
1617 | * ktime_get_monotonic_offset() - get wall_to_monotonic in ktime_t format | |
1618 | */ | |
1619 | ktime_t ktime_get_monotonic_offset(void) | |
1620 | { | |
4e250fdd | 1621 | struct timekeeper *tk = &timekeeper; |
99ee5315 TG |
1622 | unsigned long seq; |
1623 | struct timespec wtom; | |
1624 | ||
1625 | do { | |
9a7a71b1 | 1626 | seq = read_seqcount_begin(&timekeeper_seq); |
4e250fdd | 1627 | wtom = tk->wall_to_monotonic; |
9a7a71b1 | 1628 | } while (read_seqcount_retry(&timekeeper_seq, seq)); |
70471f2f | 1629 | |
99ee5315 TG |
1630 | return timespec_to_ktime(wtom); |
1631 | } | |
a80b83b7 JS |
1632 | EXPORT_SYMBOL_GPL(ktime_get_monotonic_offset); |
1633 | ||
aa6f9c59 JS |
1634 | /** |
1635 | * do_adjtimex() - Accessor function to NTP __do_adjtimex function | |
1636 | */ | |
1637 | int do_adjtimex(struct timex *txc) | |
1638 | { | |
0b5154fb | 1639 | struct timekeeper *tk = &timekeeper; |
06c017fd | 1640 | unsigned long flags; |
87ace39b | 1641 | struct timespec ts; |
0b5154fb | 1642 | s32 tai; |
e4085693 JS |
1643 | int ret; |
1644 | ||
1645 | /* Validate the data before disabling interrupts */ | |
1646 | ret = ntp_validate_timex(txc); | |
1647 | if (ret) | |
1648 | return ret; | |
1649 | ||
cef90377 JS |
1650 | if (txc->modes & ADJ_SETOFFSET) { |
1651 | struct timespec delta; | |
1652 | delta.tv_sec = txc->time.tv_sec; | |
1653 | delta.tv_nsec = txc->time.tv_usec; | |
1654 | if (!(txc->modes & ADJ_NANO)) | |
1655 | delta.tv_nsec *= 1000; | |
1656 | ret = timekeeping_inject_offset(&delta); | |
1657 | if (ret) | |
1658 | return ret; | |
1659 | } | |
1660 | ||
87ace39b | 1661 | getnstimeofday(&ts); |
87ace39b | 1662 | |
06c017fd JS |
1663 | raw_spin_lock_irqsave(&timekeeper_lock, flags); |
1664 | write_seqcount_begin(&timekeeper_seq); | |
1665 | ||
0b5154fb | 1666 | tai = tk->tai_offset; |
87ace39b | 1667 | ret = __do_adjtimex(txc, &ts, &tai); |
aa6f9c59 | 1668 | |
0b5154fb | 1669 | __timekeeping_set_tai_offset(tk, tai); |
06c017fd JS |
1670 | write_seqcount_end(&timekeeper_seq); |
1671 | raw_spin_unlock_irqrestore(&timekeeper_lock, flags); | |
1672 | ||
87ace39b JS |
1673 | return ret; |
1674 | } | |
aa6f9c59 JS |
1675 | |
1676 | #ifdef CONFIG_NTP_PPS | |
1677 | /** | |
1678 | * hardpps() - Accessor function to NTP __hardpps function | |
1679 | */ | |
1680 | void hardpps(const struct timespec *phase_ts, const struct timespec *raw_ts) | |
1681 | { | |
06c017fd JS |
1682 | unsigned long flags; |
1683 | ||
1684 | raw_spin_lock_irqsave(&timekeeper_lock, flags); | |
1685 | write_seqcount_begin(&timekeeper_seq); | |
1686 | ||
aa6f9c59 | 1687 | __hardpps(phase_ts, raw_ts); |
06c017fd JS |
1688 | |
1689 | write_seqcount_end(&timekeeper_seq); | |
1690 | raw_spin_unlock_irqrestore(&timekeeper_lock, flags); | |
aa6f9c59 JS |
1691 | } |
1692 | EXPORT_SYMBOL(hardpps); | |
1693 | #endif | |
1694 | ||
f0af911a TH |
1695 | /** |
1696 | * xtime_update() - advances the timekeeping infrastructure | |
1697 | * @ticks: number of ticks, that have elapsed since the last call. | |
1698 | * | |
1699 | * Must be called with interrupts disabled. | |
1700 | */ | |
1701 | void xtime_update(unsigned long ticks) | |
1702 | { | |
d6ad4187 | 1703 | write_seqlock(&jiffies_lock); |
f0af911a | 1704 | do_timer(ticks); |
d6ad4187 | 1705 | write_sequnlock(&jiffies_lock); |
f0af911a | 1706 | } |