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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" |
5c83545f | 28 | #include "timekeeping_internal.h" |
155ec602 | 29 | |
04397fe9 DV |
30 | #define TK_CLEAR_NTP (1 << 0) |
31 | #define TK_MIRROR (1 << 1) | |
780427f0 | 32 | #define TK_CLOCK_WAS_SET (1 << 2) |
04397fe9 | 33 | |
afa14e7c | 34 | static struct timekeeper timekeeper; |
9a7a71b1 TG |
35 | static DEFINE_RAW_SPINLOCK(timekeeper_lock); |
36 | static seqcount_t timekeeper_seq; | |
48cdc135 | 37 | static struct timekeeper shadow_timekeeper; |
155ec602 | 38 | |
8fcce546 JS |
39 | /* flag for if timekeeping is suspended */ |
40 | int __read_mostly timekeeping_suspended; | |
41 | ||
31ade306 FT |
42 | /* Flag for if there is a persistent clock on this platform */ |
43 | bool __read_mostly persistent_clock_exist = false; | |
44 | ||
1e75fa8b JS |
45 | static inline void tk_normalize_xtime(struct timekeeper *tk) |
46 | { | |
47 | while (tk->xtime_nsec >= ((u64)NSEC_PER_SEC << tk->shift)) { | |
48 | tk->xtime_nsec -= (u64)NSEC_PER_SEC << tk->shift; | |
49 | tk->xtime_sec++; | |
50 | } | |
51 | } | |
52 | ||
1e75fa8b JS |
53 | static void tk_set_xtime(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; |
1e75fa8b JS |
57 | } |
58 | ||
59 | static void tk_xtime_add(struct timekeeper *tk, const struct timespec *ts) | |
60 | { | |
61 | tk->xtime_sec += ts->tv_sec; | |
b44d50dc | 62 | tk->xtime_nsec += (u64)ts->tv_nsec << tk->shift; |
784ffcbb | 63 | tk_normalize_xtime(tk); |
1e75fa8b | 64 | } |
8fcce546 | 65 | |
6d0ef903 JS |
66 | static void tk_set_wall_to_mono(struct timekeeper *tk, struct timespec wtm) |
67 | { | |
68 | struct timespec tmp; | |
69 | ||
70 | /* | |
71 | * Verify consistency of: offset_real = -wall_to_monotonic | |
72 | * before modifying anything | |
73 | */ | |
74 | set_normalized_timespec(&tmp, -tk->wall_to_monotonic.tv_sec, | |
75 | -tk->wall_to_monotonic.tv_nsec); | |
76 | WARN_ON_ONCE(tk->offs_real.tv64 != timespec_to_ktime(tmp).tv64); | |
77 | tk->wall_to_monotonic = wtm; | |
78 | set_normalized_timespec(&tmp, -wtm.tv_sec, -wtm.tv_nsec); | |
79 | tk->offs_real = timespec_to_ktime(tmp); | |
04005f60 | 80 | tk->offs_tai = ktime_add(tk->offs_real, ktime_set(tk->tai_offset, 0)); |
6d0ef903 JS |
81 | } |
82 | ||
83 | static void tk_set_sleep_time(struct timekeeper *tk, struct timespec t) | |
84 | { | |
85 | /* Verify consistency before modifying */ | |
86 | WARN_ON_ONCE(tk->offs_boot.tv64 != timespec_to_ktime(tk->total_sleep_time).tv64); | |
87 | ||
88 | tk->total_sleep_time = t; | |
89 | tk->offs_boot = timespec_to_ktime(t); | |
90 | } | |
91 | ||
155ec602 MS |
92 | /** |
93 | * timekeeper_setup_internals - Set up internals to use clocksource clock. | |
94 | * | |
95 | * @clock: Pointer to clocksource. | |
96 | * | |
97 | * Calculates a fixed cycle/nsec interval for a given clocksource/adjustment | |
98 | * pair and interval request. | |
99 | * | |
100 | * Unless you're the timekeeping code, you should not be using this! | |
101 | */ | |
f726a697 | 102 | static void tk_setup_internals(struct timekeeper *tk, struct clocksource *clock) |
155ec602 MS |
103 | { |
104 | cycle_t interval; | |
a386b5af | 105 | u64 tmp, ntpinterval; |
1e75fa8b | 106 | struct clocksource *old_clock; |
155ec602 | 107 | |
f726a697 JS |
108 | old_clock = tk->clock; |
109 | tk->clock = clock; | |
14a3b6ab | 110 | tk->cycle_last = clock->cycle_last = clock->read(clock); |
155ec602 MS |
111 | |
112 | /* Do the ns -> cycle conversion first, using original mult */ | |
113 | tmp = NTP_INTERVAL_LENGTH; | |
114 | tmp <<= clock->shift; | |
a386b5af | 115 | ntpinterval = tmp; |
0a544198 MS |
116 | tmp += clock->mult/2; |
117 | do_div(tmp, clock->mult); | |
155ec602 MS |
118 | if (tmp == 0) |
119 | tmp = 1; | |
120 | ||
121 | interval = (cycle_t) tmp; | |
f726a697 | 122 | tk->cycle_interval = interval; |
155ec602 MS |
123 | |
124 | /* Go back from cycles -> shifted ns */ | |
f726a697 JS |
125 | tk->xtime_interval = (u64) interval * clock->mult; |
126 | tk->xtime_remainder = ntpinterval - tk->xtime_interval; | |
127 | tk->raw_interval = | |
0a544198 | 128 | ((u64) interval * clock->mult) >> clock->shift; |
155ec602 | 129 | |
1e75fa8b JS |
130 | /* if changing clocks, convert xtime_nsec shift units */ |
131 | if (old_clock) { | |
132 | int shift_change = clock->shift - old_clock->shift; | |
133 | if (shift_change < 0) | |
f726a697 | 134 | tk->xtime_nsec >>= -shift_change; |
1e75fa8b | 135 | else |
f726a697 | 136 | tk->xtime_nsec <<= shift_change; |
1e75fa8b | 137 | } |
f726a697 | 138 | tk->shift = clock->shift; |
155ec602 | 139 | |
f726a697 JS |
140 | tk->ntp_error = 0; |
141 | tk->ntp_error_shift = NTP_SCALE_SHIFT - clock->shift; | |
0a544198 MS |
142 | |
143 | /* | |
144 | * The timekeeper keeps its own mult values for the currently | |
145 | * active clocksource. These value will be adjusted via NTP | |
146 | * to counteract clock drifting. | |
147 | */ | |
f726a697 | 148 | tk->mult = clock->mult; |
155ec602 | 149 | } |
8524070b | 150 | |
2ba2a305 | 151 | /* Timekeeper helper functions. */ |
7b1f6207 SW |
152 | |
153 | #ifdef CONFIG_ARCH_USES_GETTIMEOFFSET | |
154 | u32 (*arch_gettimeoffset)(void); | |
155 | ||
156 | u32 get_arch_timeoffset(void) | |
157 | { | |
158 | if (likely(arch_gettimeoffset)) | |
159 | return arch_gettimeoffset(); | |
160 | return 0; | |
161 | } | |
162 | #else | |
163 | static inline u32 get_arch_timeoffset(void) { return 0; } | |
164 | #endif | |
165 | ||
f726a697 | 166 | static inline s64 timekeeping_get_ns(struct timekeeper *tk) |
2ba2a305 MS |
167 | { |
168 | cycle_t cycle_now, cycle_delta; | |
169 | struct clocksource *clock; | |
1e75fa8b | 170 | s64 nsec; |
2ba2a305 MS |
171 | |
172 | /* read clocksource: */ | |
f726a697 | 173 | clock = tk->clock; |
2ba2a305 MS |
174 | cycle_now = clock->read(clock); |
175 | ||
176 | /* calculate the delta since the last update_wall_time: */ | |
177 | cycle_delta = (cycle_now - clock->cycle_last) & clock->mask; | |
178 | ||
f726a697 JS |
179 | nsec = cycle_delta * tk->mult + tk->xtime_nsec; |
180 | nsec >>= tk->shift; | |
f2a5a085 | 181 | |
7b1f6207 SW |
182 | /* If arch requires, add in get_arch_timeoffset() */ |
183 | return nsec + get_arch_timeoffset(); | |
2ba2a305 MS |
184 | } |
185 | ||
f726a697 | 186 | static inline s64 timekeeping_get_ns_raw(struct timekeeper *tk) |
2ba2a305 MS |
187 | { |
188 | cycle_t cycle_now, cycle_delta; | |
189 | struct clocksource *clock; | |
f2a5a085 | 190 | s64 nsec; |
2ba2a305 MS |
191 | |
192 | /* read clocksource: */ | |
f726a697 | 193 | clock = tk->clock; |
2ba2a305 MS |
194 | cycle_now = clock->read(clock); |
195 | ||
196 | /* calculate the delta since the last update_wall_time: */ | |
197 | cycle_delta = (cycle_now - clock->cycle_last) & clock->mask; | |
198 | ||
f2a5a085 JS |
199 | /* convert delta to nanoseconds. */ |
200 | nsec = clocksource_cyc2ns(cycle_delta, clock->mult, clock->shift); | |
201 | ||
7b1f6207 SW |
202 | /* If arch requires, add in get_arch_timeoffset() */ |
203 | return nsec + get_arch_timeoffset(); | |
2ba2a305 MS |
204 | } |
205 | ||
e0b306fe MT |
206 | static RAW_NOTIFIER_HEAD(pvclock_gtod_chain); |
207 | ||
780427f0 | 208 | static void update_pvclock_gtod(struct timekeeper *tk, bool was_set) |
e0b306fe | 209 | { |
780427f0 | 210 | raw_notifier_call_chain(&pvclock_gtod_chain, was_set, tk); |
e0b306fe MT |
211 | } |
212 | ||
213 | /** | |
214 | * pvclock_gtod_register_notifier - register a pvclock timedata update listener | |
e0b306fe MT |
215 | */ |
216 | int pvclock_gtod_register_notifier(struct notifier_block *nb) | |
217 | { | |
218 | struct timekeeper *tk = &timekeeper; | |
219 | unsigned long flags; | |
220 | int ret; | |
221 | ||
9a7a71b1 | 222 | raw_spin_lock_irqsave(&timekeeper_lock, flags); |
e0b306fe | 223 | ret = raw_notifier_chain_register(&pvclock_gtod_chain, nb); |
780427f0 | 224 | update_pvclock_gtod(tk, true); |
9a7a71b1 | 225 | raw_spin_unlock_irqrestore(&timekeeper_lock, flags); |
e0b306fe MT |
226 | |
227 | return ret; | |
228 | } | |
229 | EXPORT_SYMBOL_GPL(pvclock_gtod_register_notifier); | |
230 | ||
231 | /** | |
232 | * pvclock_gtod_unregister_notifier - unregister a pvclock | |
233 | * timedata update listener | |
e0b306fe MT |
234 | */ |
235 | int pvclock_gtod_unregister_notifier(struct notifier_block *nb) | |
236 | { | |
e0b306fe MT |
237 | unsigned long flags; |
238 | int ret; | |
239 | ||
9a7a71b1 | 240 | raw_spin_lock_irqsave(&timekeeper_lock, flags); |
e0b306fe | 241 | ret = raw_notifier_chain_unregister(&pvclock_gtod_chain, nb); |
9a7a71b1 | 242 | raw_spin_unlock_irqrestore(&timekeeper_lock, flags); |
e0b306fe MT |
243 | |
244 | return ret; | |
245 | } | |
246 | EXPORT_SYMBOL_GPL(pvclock_gtod_unregister_notifier); | |
247 | ||
9a7a71b1 | 248 | /* must hold timekeeper_lock */ |
04397fe9 | 249 | static void timekeeping_update(struct timekeeper *tk, unsigned int action) |
cc06268c | 250 | { |
04397fe9 | 251 | if (action & TK_CLEAR_NTP) { |
f726a697 | 252 | tk->ntp_error = 0; |
cc06268c TG |
253 | ntp_clear(); |
254 | } | |
576094b7 | 255 | update_vsyscall(tk); |
780427f0 | 256 | update_pvclock_gtod(tk, action & TK_CLOCK_WAS_SET); |
48cdc135 | 257 | |
04397fe9 | 258 | if (action & TK_MIRROR) |
48cdc135 | 259 | memcpy(&shadow_timekeeper, &timekeeper, sizeof(timekeeper)); |
cc06268c TG |
260 | } |
261 | ||
8524070b | 262 | /** |
155ec602 | 263 | * timekeeping_forward_now - update clock to the current time |
8524070b | 264 | * |
9a055117 RZ |
265 | * Forward the current clock to update its state since the last call to |
266 | * update_wall_time(). This is useful before significant clock changes, | |
267 | * as it avoids having to deal with this time offset explicitly. | |
8524070b | 268 | */ |
f726a697 | 269 | static void timekeeping_forward_now(struct timekeeper *tk) |
8524070b JS |
270 | { |
271 | cycle_t cycle_now, cycle_delta; | |
155ec602 | 272 | struct clocksource *clock; |
9a055117 | 273 | s64 nsec; |
8524070b | 274 | |
f726a697 | 275 | clock = tk->clock; |
a0f7d48b | 276 | cycle_now = clock->read(clock); |
8524070b | 277 | cycle_delta = (cycle_now - clock->cycle_last) & clock->mask; |
14a3b6ab | 278 | tk->cycle_last = clock->cycle_last = cycle_now; |
8524070b | 279 | |
f726a697 | 280 | tk->xtime_nsec += cycle_delta * tk->mult; |
7d27558c | 281 | |
7b1f6207 SW |
282 | /* If arch requires, add in get_arch_timeoffset() */ |
283 | tk->xtime_nsec += (u64)get_arch_timeoffset() << tk->shift; | |
7d27558c | 284 | |
f726a697 | 285 | tk_normalize_xtime(tk); |
2d42244a | 286 | |
0a544198 | 287 | nsec = clocksource_cyc2ns(cycle_delta, clock->mult, clock->shift); |
f726a697 | 288 | timespec_add_ns(&tk->raw_time, nsec); |
8524070b JS |
289 | } |
290 | ||
291 | /** | |
1e817fb6 | 292 | * __getnstimeofday - Returns the time of day in a timespec. |
8524070b JS |
293 | * @ts: pointer to the timespec to be set |
294 | * | |
1e817fb6 KC |
295 | * Updates the time of day in the timespec. |
296 | * Returns 0 on success, or -ve when suspended (timespec will be undefined). | |
8524070b | 297 | */ |
1e817fb6 | 298 | int __getnstimeofday(struct timespec *ts) |
8524070b | 299 | { |
4e250fdd | 300 | struct timekeeper *tk = &timekeeper; |
8524070b | 301 | unsigned long seq; |
1e75fa8b | 302 | s64 nsecs = 0; |
8524070b JS |
303 | |
304 | do { | |
9a7a71b1 | 305 | seq = read_seqcount_begin(&timekeeper_seq); |
8524070b | 306 | |
4e250fdd | 307 | ts->tv_sec = tk->xtime_sec; |
ec145bab | 308 | nsecs = timekeeping_get_ns(tk); |
8524070b | 309 | |
9a7a71b1 | 310 | } while (read_seqcount_retry(&timekeeper_seq, seq)); |
8524070b | 311 | |
ec145bab | 312 | ts->tv_nsec = 0; |
8524070b | 313 | timespec_add_ns(ts, nsecs); |
1e817fb6 KC |
314 | |
315 | /* | |
316 | * Do not bail out early, in case there were callers still using | |
317 | * the value, even in the face of the WARN_ON. | |
318 | */ | |
319 | if (unlikely(timekeeping_suspended)) | |
320 | return -EAGAIN; | |
321 | return 0; | |
322 | } | |
323 | EXPORT_SYMBOL(__getnstimeofday); | |
324 | ||
325 | /** | |
326 | * getnstimeofday - Returns the time of day in a timespec. | |
327 | * @ts: pointer to the timespec to be set | |
328 | * | |
329 | * Returns the time of day in a timespec (WARN if suspended). | |
330 | */ | |
331 | void getnstimeofday(struct timespec *ts) | |
332 | { | |
333 | WARN_ON(__getnstimeofday(ts)); | |
8524070b | 334 | } |
8524070b JS |
335 | EXPORT_SYMBOL(getnstimeofday); |
336 | ||
951ed4d3 MS |
337 | ktime_t ktime_get(void) |
338 | { | |
4e250fdd | 339 | struct timekeeper *tk = &timekeeper; |
951ed4d3 MS |
340 | unsigned int seq; |
341 | s64 secs, nsecs; | |
342 | ||
343 | WARN_ON(timekeeping_suspended); | |
344 | ||
345 | do { | |
9a7a71b1 | 346 | seq = read_seqcount_begin(&timekeeper_seq); |
4e250fdd JS |
347 | secs = tk->xtime_sec + tk->wall_to_monotonic.tv_sec; |
348 | nsecs = timekeeping_get_ns(tk) + tk->wall_to_monotonic.tv_nsec; | |
951ed4d3 | 349 | |
9a7a71b1 | 350 | } while (read_seqcount_retry(&timekeeper_seq, seq)); |
951ed4d3 MS |
351 | /* |
352 | * Use ktime_set/ktime_add_ns to create a proper ktime on | |
353 | * 32-bit architectures without CONFIG_KTIME_SCALAR. | |
354 | */ | |
355 | return ktime_add_ns(ktime_set(secs, 0), nsecs); | |
356 | } | |
357 | EXPORT_SYMBOL_GPL(ktime_get); | |
358 | ||
359 | /** | |
360 | * ktime_get_ts - get the monotonic clock in timespec format | |
361 | * @ts: pointer to timespec variable | |
362 | * | |
363 | * The function calculates the monotonic clock from the realtime | |
364 | * clock and the wall_to_monotonic offset and stores the result | |
365 | * in normalized timespec format in the variable pointed to by @ts. | |
366 | */ | |
367 | void ktime_get_ts(struct timespec *ts) | |
368 | { | |
4e250fdd | 369 | struct timekeeper *tk = &timekeeper; |
951ed4d3 | 370 | struct timespec tomono; |
ec145bab | 371 | s64 nsec; |
951ed4d3 | 372 | unsigned int seq; |
951ed4d3 MS |
373 | |
374 | WARN_ON(timekeeping_suspended); | |
375 | ||
376 | do { | |
9a7a71b1 | 377 | seq = read_seqcount_begin(&timekeeper_seq); |
4e250fdd | 378 | ts->tv_sec = tk->xtime_sec; |
ec145bab | 379 | nsec = timekeeping_get_ns(tk); |
4e250fdd | 380 | tomono = tk->wall_to_monotonic; |
951ed4d3 | 381 | |
9a7a71b1 | 382 | } while (read_seqcount_retry(&timekeeper_seq, seq)); |
951ed4d3 | 383 | |
ec145bab JS |
384 | ts->tv_sec += tomono.tv_sec; |
385 | ts->tv_nsec = 0; | |
386 | timespec_add_ns(ts, nsec + tomono.tv_nsec); | |
951ed4d3 MS |
387 | } |
388 | EXPORT_SYMBOL_GPL(ktime_get_ts); | |
389 | ||
1ff3c967 JS |
390 | |
391 | /** | |
392 | * timekeeping_clocktai - Returns the TAI time of day in a timespec | |
393 | * @ts: pointer to the timespec to be set | |
394 | * | |
395 | * Returns the time of day in a timespec. | |
396 | */ | |
397 | void timekeeping_clocktai(struct timespec *ts) | |
398 | { | |
399 | struct timekeeper *tk = &timekeeper; | |
400 | unsigned long seq; | |
401 | u64 nsecs; | |
402 | ||
403 | WARN_ON(timekeeping_suspended); | |
404 | ||
405 | do { | |
9a7a71b1 | 406 | seq = read_seqcount_begin(&timekeeper_seq); |
1ff3c967 JS |
407 | |
408 | ts->tv_sec = tk->xtime_sec + tk->tai_offset; | |
409 | nsecs = timekeeping_get_ns(tk); | |
410 | ||
9a7a71b1 | 411 | } while (read_seqcount_retry(&timekeeper_seq, seq)); |
1ff3c967 JS |
412 | |
413 | ts->tv_nsec = 0; | |
414 | timespec_add_ns(ts, nsecs); | |
415 | ||
416 | } | |
417 | EXPORT_SYMBOL(timekeeping_clocktai); | |
418 | ||
419 | ||
90adda98 JS |
420 | /** |
421 | * ktime_get_clocktai - Returns the TAI time of day in a ktime | |
422 | * | |
423 | * Returns the time of day in a ktime. | |
424 | */ | |
425 | ktime_t ktime_get_clocktai(void) | |
426 | { | |
427 | struct timespec ts; | |
428 | ||
429 | timekeeping_clocktai(&ts); | |
430 | return timespec_to_ktime(ts); | |
431 | } | |
432 | EXPORT_SYMBOL(ktime_get_clocktai); | |
433 | ||
e2c18e49 AG |
434 | #ifdef CONFIG_NTP_PPS |
435 | ||
436 | /** | |
437 | * getnstime_raw_and_real - get day and raw monotonic time in timespec format | |
438 | * @ts_raw: pointer to the timespec to be set to raw monotonic time | |
439 | * @ts_real: pointer to the timespec to be set to the time of day | |
440 | * | |
441 | * This function reads both the time of day and raw monotonic time at the | |
442 | * same time atomically and stores the resulting timestamps in timespec | |
443 | * format. | |
444 | */ | |
445 | void getnstime_raw_and_real(struct timespec *ts_raw, struct timespec *ts_real) | |
446 | { | |
4e250fdd | 447 | struct timekeeper *tk = &timekeeper; |
e2c18e49 AG |
448 | unsigned long seq; |
449 | s64 nsecs_raw, nsecs_real; | |
450 | ||
451 | WARN_ON_ONCE(timekeeping_suspended); | |
452 | ||
453 | do { | |
9a7a71b1 | 454 | seq = read_seqcount_begin(&timekeeper_seq); |
e2c18e49 | 455 | |
4e250fdd JS |
456 | *ts_raw = tk->raw_time; |
457 | ts_real->tv_sec = tk->xtime_sec; | |
1e75fa8b | 458 | ts_real->tv_nsec = 0; |
e2c18e49 | 459 | |
4e250fdd JS |
460 | nsecs_raw = timekeeping_get_ns_raw(tk); |
461 | nsecs_real = timekeeping_get_ns(tk); | |
e2c18e49 | 462 | |
9a7a71b1 | 463 | } while (read_seqcount_retry(&timekeeper_seq, seq)); |
e2c18e49 AG |
464 | |
465 | timespec_add_ns(ts_raw, nsecs_raw); | |
466 | timespec_add_ns(ts_real, nsecs_real); | |
467 | } | |
468 | EXPORT_SYMBOL(getnstime_raw_and_real); | |
469 | ||
470 | #endif /* CONFIG_NTP_PPS */ | |
471 | ||
8524070b JS |
472 | /** |
473 | * do_gettimeofday - Returns the time of day in a timeval | |
474 | * @tv: pointer to the timeval to be set | |
475 | * | |
efd9ac86 | 476 | * NOTE: Users should be converted to using getnstimeofday() |
8524070b JS |
477 | */ |
478 | void do_gettimeofday(struct timeval *tv) | |
479 | { | |
480 | struct timespec now; | |
481 | ||
efd9ac86 | 482 | getnstimeofday(&now); |
8524070b JS |
483 | tv->tv_sec = now.tv_sec; |
484 | tv->tv_usec = now.tv_nsec/1000; | |
485 | } | |
8524070b | 486 | EXPORT_SYMBOL(do_gettimeofday); |
d239f49d | 487 | |
8524070b JS |
488 | /** |
489 | * do_settimeofday - Sets the time of day | |
490 | * @tv: pointer to the timespec variable containing the new time | |
491 | * | |
492 | * Sets the time of day to the new time and update NTP and notify hrtimers | |
493 | */ | |
1e6d7679 | 494 | int do_settimeofday(const struct timespec *tv) |
8524070b | 495 | { |
4e250fdd | 496 | struct timekeeper *tk = &timekeeper; |
1e75fa8b | 497 | struct timespec ts_delta, xt; |
92c1d3ed | 498 | unsigned long flags; |
8524070b | 499 | |
cee58483 | 500 | if (!timespec_valid_strict(tv)) |
8524070b JS |
501 | return -EINVAL; |
502 | ||
9a7a71b1 TG |
503 | raw_spin_lock_irqsave(&timekeeper_lock, flags); |
504 | write_seqcount_begin(&timekeeper_seq); | |
8524070b | 505 | |
4e250fdd | 506 | timekeeping_forward_now(tk); |
9a055117 | 507 | |
4e250fdd | 508 | xt = tk_xtime(tk); |
1e75fa8b JS |
509 | ts_delta.tv_sec = tv->tv_sec - xt.tv_sec; |
510 | ts_delta.tv_nsec = tv->tv_nsec - xt.tv_nsec; | |
511 | ||
4e250fdd | 512 | tk_set_wall_to_mono(tk, timespec_sub(tk->wall_to_monotonic, ts_delta)); |
8524070b | 513 | |
4e250fdd | 514 | tk_set_xtime(tk, tv); |
1e75fa8b | 515 | |
780427f0 | 516 | timekeeping_update(tk, TK_CLEAR_NTP | TK_MIRROR | TK_CLOCK_WAS_SET); |
8524070b | 517 | |
9a7a71b1 TG |
518 | write_seqcount_end(&timekeeper_seq); |
519 | raw_spin_unlock_irqrestore(&timekeeper_lock, flags); | |
8524070b JS |
520 | |
521 | /* signal hrtimers about time change */ | |
522 | clock_was_set(); | |
523 | ||
524 | return 0; | |
525 | } | |
8524070b JS |
526 | EXPORT_SYMBOL(do_settimeofday); |
527 | ||
c528f7c6 JS |
528 | /** |
529 | * timekeeping_inject_offset - Adds or subtracts from the current time. | |
530 | * @tv: pointer to the timespec variable containing the offset | |
531 | * | |
532 | * Adds or subtracts an offset value from the current time. | |
533 | */ | |
534 | int timekeeping_inject_offset(struct timespec *ts) | |
535 | { | |
4e250fdd | 536 | struct timekeeper *tk = &timekeeper; |
92c1d3ed | 537 | unsigned long flags; |
4e8b1452 JS |
538 | struct timespec tmp; |
539 | int ret = 0; | |
c528f7c6 JS |
540 | |
541 | if ((unsigned long)ts->tv_nsec >= NSEC_PER_SEC) | |
542 | return -EINVAL; | |
543 | ||
9a7a71b1 TG |
544 | raw_spin_lock_irqsave(&timekeeper_lock, flags); |
545 | write_seqcount_begin(&timekeeper_seq); | |
c528f7c6 | 546 | |
4e250fdd | 547 | timekeeping_forward_now(tk); |
c528f7c6 | 548 | |
4e8b1452 JS |
549 | /* Make sure the proposed value is valid */ |
550 | tmp = timespec_add(tk_xtime(tk), *ts); | |
cee58483 | 551 | if (!timespec_valid_strict(&tmp)) { |
4e8b1452 JS |
552 | ret = -EINVAL; |
553 | goto error; | |
554 | } | |
1e75fa8b | 555 | |
4e250fdd JS |
556 | tk_xtime_add(tk, ts); |
557 | tk_set_wall_to_mono(tk, timespec_sub(tk->wall_to_monotonic, *ts)); | |
c528f7c6 | 558 | |
4e8b1452 | 559 | error: /* even if we error out, we forwarded the time, so call update */ |
780427f0 | 560 | timekeeping_update(tk, TK_CLEAR_NTP | TK_MIRROR | TK_CLOCK_WAS_SET); |
c528f7c6 | 561 | |
9a7a71b1 TG |
562 | write_seqcount_end(&timekeeper_seq); |
563 | raw_spin_unlock_irqrestore(&timekeeper_lock, flags); | |
c528f7c6 JS |
564 | |
565 | /* signal hrtimers about time change */ | |
566 | clock_was_set(); | |
567 | ||
4e8b1452 | 568 | return ret; |
c528f7c6 JS |
569 | } |
570 | EXPORT_SYMBOL(timekeeping_inject_offset); | |
571 | ||
cc244dda JS |
572 | |
573 | /** | |
574 | * timekeeping_get_tai_offset - Returns current TAI offset from UTC | |
575 | * | |
576 | */ | |
577 | s32 timekeeping_get_tai_offset(void) | |
578 | { | |
579 | struct timekeeper *tk = &timekeeper; | |
580 | unsigned int seq; | |
581 | s32 ret; | |
582 | ||
583 | do { | |
9a7a71b1 | 584 | seq = read_seqcount_begin(&timekeeper_seq); |
cc244dda | 585 | ret = tk->tai_offset; |
9a7a71b1 | 586 | } while (read_seqcount_retry(&timekeeper_seq, seq)); |
cc244dda JS |
587 | |
588 | return ret; | |
589 | } | |
590 | ||
591 | /** | |
592 | * __timekeeping_set_tai_offset - Lock free worker function | |
593 | * | |
594 | */ | |
dd5d70e8 | 595 | static void __timekeeping_set_tai_offset(struct timekeeper *tk, s32 tai_offset) |
cc244dda JS |
596 | { |
597 | tk->tai_offset = tai_offset; | |
04005f60 | 598 | tk->offs_tai = ktime_add(tk->offs_real, ktime_set(tai_offset, 0)); |
cc244dda JS |
599 | } |
600 | ||
601 | /** | |
602 | * timekeeping_set_tai_offset - Sets the current TAI offset from UTC | |
603 | * | |
604 | */ | |
605 | void timekeeping_set_tai_offset(s32 tai_offset) | |
606 | { | |
607 | struct timekeeper *tk = &timekeeper; | |
608 | unsigned long flags; | |
609 | ||
9a7a71b1 TG |
610 | raw_spin_lock_irqsave(&timekeeper_lock, flags); |
611 | write_seqcount_begin(&timekeeper_seq); | |
cc244dda | 612 | __timekeeping_set_tai_offset(tk, tai_offset); |
f55c0760 | 613 | timekeeping_update(tk, TK_MIRROR | TK_CLOCK_WAS_SET); |
9a7a71b1 TG |
614 | write_seqcount_end(&timekeeper_seq); |
615 | raw_spin_unlock_irqrestore(&timekeeper_lock, flags); | |
4e8f8b34 | 616 | clock_was_set(); |
cc244dda JS |
617 | } |
618 | ||
8524070b JS |
619 | /** |
620 | * change_clocksource - Swaps clocksources if a new one is available | |
621 | * | |
622 | * Accumulates current time interval and initializes new clocksource | |
623 | */ | |
75c5158f | 624 | static int change_clocksource(void *data) |
8524070b | 625 | { |
4e250fdd | 626 | struct timekeeper *tk = &timekeeper; |
4614e6ad | 627 | struct clocksource *new, *old; |
f695cf94 | 628 | unsigned long flags; |
8524070b | 629 | |
75c5158f | 630 | new = (struct clocksource *) data; |
8524070b | 631 | |
9a7a71b1 TG |
632 | raw_spin_lock_irqsave(&timekeeper_lock, flags); |
633 | write_seqcount_begin(&timekeeper_seq); | |
f695cf94 | 634 | |
4e250fdd | 635 | timekeeping_forward_now(tk); |
09ac369c TG |
636 | /* |
637 | * If the cs is in module, get a module reference. Succeeds | |
638 | * for built-in code (owner == NULL) as well. | |
639 | */ | |
640 | if (try_module_get(new->owner)) { | |
641 | if (!new->enable || new->enable(new) == 0) { | |
642 | old = tk->clock; | |
643 | tk_setup_internals(tk, new); | |
644 | if (old->disable) | |
645 | old->disable(old); | |
646 | module_put(old->owner); | |
647 | } else { | |
648 | module_put(new->owner); | |
649 | } | |
75c5158f | 650 | } |
780427f0 | 651 | timekeeping_update(tk, TK_CLEAR_NTP | TK_MIRROR | TK_CLOCK_WAS_SET); |
f695cf94 | 652 | |
9a7a71b1 TG |
653 | write_seqcount_end(&timekeeper_seq); |
654 | raw_spin_unlock_irqrestore(&timekeeper_lock, flags); | |
f695cf94 | 655 | |
75c5158f MS |
656 | return 0; |
657 | } | |
8524070b | 658 | |
75c5158f MS |
659 | /** |
660 | * timekeeping_notify - Install a new clock source | |
661 | * @clock: pointer to the clock source | |
662 | * | |
663 | * This function is called from clocksource.c after a new, better clock | |
664 | * source has been registered. The caller holds the clocksource_mutex. | |
665 | */ | |
ba919d1c | 666 | int timekeeping_notify(struct clocksource *clock) |
75c5158f | 667 | { |
4e250fdd JS |
668 | struct timekeeper *tk = &timekeeper; |
669 | ||
670 | if (tk->clock == clock) | |
ba919d1c | 671 | return 0; |
75c5158f | 672 | stop_machine(change_clocksource, clock, NULL); |
8524070b | 673 | tick_clock_notify(); |
ba919d1c | 674 | return tk->clock == clock ? 0 : -1; |
8524070b | 675 | } |
75c5158f | 676 | |
a40f262c TG |
677 | /** |
678 | * ktime_get_real - get the real (wall-) time in ktime_t format | |
679 | * | |
680 | * returns the time in ktime_t format | |
681 | */ | |
682 | ktime_t ktime_get_real(void) | |
683 | { | |
684 | struct timespec now; | |
685 | ||
686 | getnstimeofday(&now); | |
687 | ||
688 | return timespec_to_ktime(now); | |
689 | } | |
690 | EXPORT_SYMBOL_GPL(ktime_get_real); | |
8524070b | 691 | |
2d42244a JS |
692 | /** |
693 | * getrawmonotonic - Returns the raw monotonic time in a timespec | |
694 | * @ts: pointer to the timespec to be set | |
695 | * | |
696 | * Returns the raw monotonic time (completely un-modified by ntp) | |
697 | */ | |
698 | void getrawmonotonic(struct timespec *ts) | |
699 | { | |
4e250fdd | 700 | struct timekeeper *tk = &timekeeper; |
2d42244a JS |
701 | unsigned long seq; |
702 | s64 nsecs; | |
2d42244a JS |
703 | |
704 | do { | |
9a7a71b1 | 705 | seq = read_seqcount_begin(&timekeeper_seq); |
4e250fdd JS |
706 | nsecs = timekeeping_get_ns_raw(tk); |
707 | *ts = tk->raw_time; | |
2d42244a | 708 | |
9a7a71b1 | 709 | } while (read_seqcount_retry(&timekeeper_seq, seq)); |
2d42244a JS |
710 | |
711 | timespec_add_ns(ts, nsecs); | |
712 | } | |
713 | EXPORT_SYMBOL(getrawmonotonic); | |
714 | ||
8524070b | 715 | /** |
cf4fc6cb | 716 | * timekeeping_valid_for_hres - Check if timekeeping is suitable for hres |
8524070b | 717 | */ |
cf4fc6cb | 718 | int timekeeping_valid_for_hres(void) |
8524070b | 719 | { |
4e250fdd | 720 | struct timekeeper *tk = &timekeeper; |
8524070b JS |
721 | unsigned long seq; |
722 | int ret; | |
723 | ||
724 | do { | |
9a7a71b1 | 725 | seq = read_seqcount_begin(&timekeeper_seq); |
8524070b | 726 | |
4e250fdd | 727 | ret = tk->clock->flags & CLOCK_SOURCE_VALID_FOR_HRES; |
8524070b | 728 | |
9a7a71b1 | 729 | } while (read_seqcount_retry(&timekeeper_seq, seq)); |
8524070b JS |
730 | |
731 | return ret; | |
732 | } | |
733 | ||
98962465 JH |
734 | /** |
735 | * timekeeping_max_deferment - Returns max time the clocksource can be deferred | |
98962465 JH |
736 | */ |
737 | u64 timekeeping_max_deferment(void) | |
738 | { | |
4e250fdd | 739 | struct timekeeper *tk = &timekeeper; |
70471f2f JS |
740 | unsigned long seq; |
741 | u64 ret; | |
42e71e81 | 742 | |
70471f2f | 743 | do { |
9a7a71b1 | 744 | seq = read_seqcount_begin(&timekeeper_seq); |
70471f2f | 745 | |
4e250fdd | 746 | ret = tk->clock->max_idle_ns; |
70471f2f | 747 | |
9a7a71b1 | 748 | } while (read_seqcount_retry(&timekeeper_seq, seq)); |
70471f2f JS |
749 | |
750 | return ret; | |
98962465 JH |
751 | } |
752 | ||
8524070b | 753 | /** |
d4f587c6 | 754 | * read_persistent_clock - Return time from the persistent clock. |
8524070b JS |
755 | * |
756 | * Weak dummy function for arches that do not yet support it. | |
d4f587c6 MS |
757 | * Reads the time from the battery backed persistent clock. |
758 | * Returns a timespec with tv_sec=0 and tv_nsec=0 if unsupported. | |
8524070b JS |
759 | * |
760 | * XXX - Do be sure to remove it once all arches implement it. | |
761 | */ | |
d4f587c6 | 762 | void __attribute__((weak)) read_persistent_clock(struct timespec *ts) |
8524070b | 763 | { |
d4f587c6 MS |
764 | ts->tv_sec = 0; |
765 | ts->tv_nsec = 0; | |
8524070b JS |
766 | } |
767 | ||
23970e38 MS |
768 | /** |
769 | * read_boot_clock - Return time of the system start. | |
770 | * | |
771 | * Weak dummy function for arches that do not yet support it. | |
772 | * Function to read the exact time the system has been started. | |
773 | * Returns a timespec with tv_sec=0 and tv_nsec=0 if unsupported. | |
774 | * | |
775 | * XXX - Do be sure to remove it once all arches implement it. | |
776 | */ | |
777 | void __attribute__((weak)) read_boot_clock(struct timespec *ts) | |
778 | { | |
779 | ts->tv_sec = 0; | |
780 | ts->tv_nsec = 0; | |
781 | } | |
782 | ||
8524070b JS |
783 | /* |
784 | * timekeeping_init - Initializes the clocksource and common timekeeping values | |
785 | */ | |
786 | void __init timekeeping_init(void) | |
787 | { | |
4e250fdd | 788 | struct timekeeper *tk = &timekeeper; |
155ec602 | 789 | struct clocksource *clock; |
8524070b | 790 | unsigned long flags; |
6d0ef903 | 791 | struct timespec now, boot, tmp; |
d4f587c6 MS |
792 | |
793 | read_persistent_clock(&now); | |
31ade306 | 794 | |
cee58483 | 795 | if (!timespec_valid_strict(&now)) { |
4e8b1452 JS |
796 | pr_warn("WARNING: Persistent clock returned invalid value!\n" |
797 | " Check your CMOS/BIOS settings.\n"); | |
798 | now.tv_sec = 0; | |
799 | now.tv_nsec = 0; | |
31ade306 FT |
800 | } else if (now.tv_sec || now.tv_nsec) |
801 | persistent_clock_exist = true; | |
4e8b1452 | 802 | |
23970e38 | 803 | read_boot_clock(&boot); |
cee58483 | 804 | if (!timespec_valid_strict(&boot)) { |
4e8b1452 JS |
805 | pr_warn("WARNING: Boot clock returned invalid value!\n" |
806 | " Check your CMOS/BIOS settings.\n"); | |
807 | boot.tv_sec = 0; | |
808 | boot.tv_nsec = 0; | |
809 | } | |
8524070b | 810 | |
9a7a71b1 TG |
811 | raw_spin_lock_irqsave(&timekeeper_lock, flags); |
812 | write_seqcount_begin(&timekeeper_seq); | |
06c017fd JS |
813 | ntp_init(); |
814 | ||
f1b82746 | 815 | clock = clocksource_default_clock(); |
a0f7d48b MS |
816 | if (clock->enable) |
817 | clock->enable(clock); | |
4e250fdd | 818 | tk_setup_internals(tk, clock); |
8524070b | 819 | |
4e250fdd JS |
820 | tk_set_xtime(tk, &now); |
821 | tk->raw_time.tv_sec = 0; | |
822 | tk->raw_time.tv_nsec = 0; | |
1e75fa8b | 823 | if (boot.tv_sec == 0 && boot.tv_nsec == 0) |
4e250fdd | 824 | boot = tk_xtime(tk); |
1e75fa8b | 825 | |
6d0ef903 | 826 | set_normalized_timespec(&tmp, -boot.tv_sec, -boot.tv_nsec); |
4e250fdd | 827 | tk_set_wall_to_mono(tk, tmp); |
6d0ef903 JS |
828 | |
829 | tmp.tv_sec = 0; | |
830 | tmp.tv_nsec = 0; | |
4e250fdd | 831 | tk_set_sleep_time(tk, tmp); |
6d0ef903 | 832 | |
48cdc135 TG |
833 | memcpy(&shadow_timekeeper, &timekeeper, sizeof(timekeeper)); |
834 | ||
9a7a71b1 TG |
835 | write_seqcount_end(&timekeeper_seq); |
836 | raw_spin_unlock_irqrestore(&timekeeper_lock, flags); | |
8524070b JS |
837 | } |
838 | ||
8524070b | 839 | /* time in seconds when suspend began */ |
d4f587c6 | 840 | static struct timespec timekeeping_suspend_time; |
8524070b | 841 | |
304529b1 JS |
842 | /** |
843 | * __timekeeping_inject_sleeptime - Internal function to add sleep interval | |
844 | * @delta: pointer to a timespec delta value | |
845 | * | |
846 | * Takes a timespec offset measuring a suspend interval and properly | |
847 | * adds the sleep offset to the timekeeping variables. | |
848 | */ | |
f726a697 JS |
849 | static void __timekeeping_inject_sleeptime(struct timekeeper *tk, |
850 | struct timespec *delta) | |
304529b1 | 851 | { |
cee58483 | 852 | if (!timespec_valid_strict(delta)) { |
cbaa5152 | 853 | printk(KERN_WARNING "__timekeeping_inject_sleeptime: Invalid " |
cb5de2f8 JS |
854 | "sleep delta value!\n"); |
855 | return; | |
856 | } | |
f726a697 | 857 | tk_xtime_add(tk, delta); |
6d0ef903 JS |
858 | tk_set_wall_to_mono(tk, timespec_sub(tk->wall_to_monotonic, *delta)); |
859 | tk_set_sleep_time(tk, timespec_add(tk->total_sleep_time, *delta)); | |
5c83545f | 860 | tk_debug_account_sleep_time(delta); |
304529b1 JS |
861 | } |
862 | ||
304529b1 JS |
863 | /** |
864 | * timekeeping_inject_sleeptime - Adds suspend interval to timeekeeping values | |
865 | * @delta: pointer to a timespec delta value | |
866 | * | |
867 | * This hook is for architectures that cannot support read_persistent_clock | |
868 | * because their RTC/persistent clock is only accessible when irqs are enabled. | |
869 | * | |
870 | * This function should only be called by rtc_resume(), and allows | |
871 | * a suspend offset to be injected into the timekeeping values. | |
872 | */ | |
873 | void timekeeping_inject_sleeptime(struct timespec *delta) | |
874 | { | |
4e250fdd | 875 | struct timekeeper *tk = &timekeeper; |
92c1d3ed | 876 | unsigned long flags; |
304529b1 | 877 | |
31ade306 FT |
878 | /* |
879 | * Make sure we don't set the clock twice, as timekeeping_resume() | |
880 | * already did it | |
881 | */ | |
882 | if (has_persistent_clock()) | |
304529b1 JS |
883 | return; |
884 | ||
9a7a71b1 TG |
885 | raw_spin_lock_irqsave(&timekeeper_lock, flags); |
886 | write_seqcount_begin(&timekeeper_seq); | |
70471f2f | 887 | |
4e250fdd | 888 | timekeeping_forward_now(tk); |
304529b1 | 889 | |
4e250fdd | 890 | __timekeeping_inject_sleeptime(tk, delta); |
304529b1 | 891 | |
780427f0 | 892 | timekeeping_update(tk, TK_CLEAR_NTP | TK_MIRROR | TK_CLOCK_WAS_SET); |
304529b1 | 893 | |
9a7a71b1 TG |
894 | write_seqcount_end(&timekeeper_seq); |
895 | raw_spin_unlock_irqrestore(&timekeeper_lock, flags); | |
304529b1 JS |
896 | |
897 | /* signal hrtimers about time change */ | |
898 | clock_was_set(); | |
899 | } | |
900 | ||
8524070b JS |
901 | /** |
902 | * timekeeping_resume - Resumes the generic timekeeping subsystem. | |
8524070b JS |
903 | * |
904 | * This is for the generic clocksource timekeeping. | |
905 | * xtime/wall_to_monotonic/jiffies/etc are | |
906 | * still managed by arch specific suspend/resume code. | |
907 | */ | |
e1a85b2c | 908 | static void timekeeping_resume(void) |
8524070b | 909 | { |
4e250fdd | 910 | struct timekeeper *tk = &timekeeper; |
e445cf1c | 911 | struct clocksource *clock = tk->clock; |
92c1d3ed | 912 | unsigned long flags; |
e445cf1c FT |
913 | struct timespec ts_new, ts_delta; |
914 | cycle_t cycle_now, cycle_delta; | |
915 | bool suspendtime_found = false; | |
d4f587c6 | 916 | |
e445cf1c | 917 | read_persistent_clock(&ts_new); |
8524070b | 918 | |
adc78e6b | 919 | clockevents_resume(); |
d10ff3fb TG |
920 | clocksource_resume(); |
921 | ||
9a7a71b1 TG |
922 | raw_spin_lock_irqsave(&timekeeper_lock, flags); |
923 | write_seqcount_begin(&timekeeper_seq); | |
8524070b | 924 | |
e445cf1c FT |
925 | /* |
926 | * After system resumes, we need to calculate the suspended time and | |
927 | * compensate it for the OS time. There are 3 sources that could be | |
928 | * used: Nonstop clocksource during suspend, persistent clock and rtc | |
929 | * device. | |
930 | * | |
931 | * One specific platform may have 1 or 2 or all of them, and the | |
932 | * preference will be: | |
933 | * suspend-nonstop clocksource -> persistent clock -> rtc | |
934 | * The less preferred source will only be tried if there is no better | |
935 | * usable source. The rtc part is handled separately in rtc core code. | |
936 | */ | |
937 | cycle_now = clock->read(clock); | |
938 | if ((clock->flags & CLOCK_SOURCE_SUSPEND_NONSTOP) && | |
939 | cycle_now > clock->cycle_last) { | |
940 | u64 num, max = ULLONG_MAX; | |
941 | u32 mult = clock->mult; | |
942 | u32 shift = clock->shift; | |
943 | s64 nsec = 0; | |
944 | ||
945 | cycle_delta = (cycle_now - clock->cycle_last) & clock->mask; | |
946 | ||
947 | /* | |
948 | * "cycle_delta * mutl" may cause 64 bits overflow, if the | |
949 | * suspended time is too long. In that case we need do the | |
950 | * 64 bits math carefully | |
951 | */ | |
952 | do_div(max, mult); | |
953 | if (cycle_delta > max) { | |
954 | num = div64_u64(cycle_delta, max); | |
955 | nsec = (((u64) max * mult) >> shift) * num; | |
956 | cycle_delta -= num * max; | |
957 | } | |
958 | nsec += ((u64) cycle_delta * mult) >> shift; | |
959 | ||
960 | ts_delta = ns_to_timespec(nsec); | |
961 | suspendtime_found = true; | |
962 | } else if (timespec_compare(&ts_new, &timekeeping_suspend_time) > 0) { | |
963 | ts_delta = timespec_sub(ts_new, timekeeping_suspend_time); | |
964 | suspendtime_found = true; | |
8524070b | 965 | } |
e445cf1c FT |
966 | |
967 | if (suspendtime_found) | |
968 | __timekeeping_inject_sleeptime(tk, &ts_delta); | |
969 | ||
970 | /* Re-base the last cycle value */ | |
77c675ba | 971 | tk->cycle_last = clock->cycle_last = cycle_now; |
4e250fdd | 972 | tk->ntp_error = 0; |
8524070b | 973 | timekeeping_suspended = 0; |
780427f0 | 974 | timekeeping_update(tk, TK_MIRROR | TK_CLOCK_WAS_SET); |
9a7a71b1 TG |
975 | write_seqcount_end(&timekeeper_seq); |
976 | raw_spin_unlock_irqrestore(&timekeeper_lock, flags); | |
8524070b JS |
977 | |
978 | touch_softlockup_watchdog(); | |
979 | ||
980 | clockevents_notify(CLOCK_EVT_NOTIFY_RESUME, NULL); | |
981 | ||
982 | /* Resume hrtimers */ | |
b12a03ce | 983 | hrtimers_resume(); |
8524070b JS |
984 | } |
985 | ||
e1a85b2c | 986 | static int timekeeping_suspend(void) |
8524070b | 987 | { |
4e250fdd | 988 | struct timekeeper *tk = &timekeeper; |
92c1d3ed | 989 | unsigned long flags; |
cb33217b JS |
990 | struct timespec delta, delta_delta; |
991 | static struct timespec old_delta; | |
8524070b | 992 | |
d4f587c6 | 993 | read_persistent_clock(&timekeeping_suspend_time); |
3be90950 | 994 | |
0d6bd995 ZM |
995 | /* |
996 | * On some systems the persistent_clock can not be detected at | |
997 | * timekeeping_init by its return value, so if we see a valid | |
998 | * value returned, update the persistent_clock_exists flag. | |
999 | */ | |
1000 | if (timekeeping_suspend_time.tv_sec || timekeeping_suspend_time.tv_nsec) | |
1001 | persistent_clock_exist = true; | |
1002 | ||
9a7a71b1 TG |
1003 | raw_spin_lock_irqsave(&timekeeper_lock, flags); |
1004 | write_seqcount_begin(&timekeeper_seq); | |
4e250fdd | 1005 | timekeeping_forward_now(tk); |
8524070b | 1006 | timekeeping_suspended = 1; |
cb33217b JS |
1007 | |
1008 | /* | |
1009 | * To avoid drift caused by repeated suspend/resumes, | |
1010 | * which each can add ~1 second drift error, | |
1011 | * try to compensate so the difference in system time | |
1012 | * and persistent_clock time stays close to constant. | |
1013 | */ | |
4e250fdd | 1014 | delta = timespec_sub(tk_xtime(tk), timekeeping_suspend_time); |
cb33217b JS |
1015 | delta_delta = timespec_sub(delta, old_delta); |
1016 | if (abs(delta_delta.tv_sec) >= 2) { | |
1017 | /* | |
1018 | * if delta_delta is too large, assume time correction | |
1019 | * has occured and set old_delta to the current delta. | |
1020 | */ | |
1021 | old_delta = delta; | |
1022 | } else { | |
1023 | /* Otherwise try to adjust old_system to compensate */ | |
1024 | timekeeping_suspend_time = | |
1025 | timespec_add(timekeeping_suspend_time, delta_delta); | |
1026 | } | |
9a7a71b1 TG |
1027 | write_seqcount_end(&timekeeper_seq); |
1028 | raw_spin_unlock_irqrestore(&timekeeper_lock, flags); | |
8524070b JS |
1029 | |
1030 | clockevents_notify(CLOCK_EVT_NOTIFY_SUSPEND, NULL); | |
c54a42b1 | 1031 | clocksource_suspend(); |
adc78e6b | 1032 | clockevents_suspend(); |
8524070b JS |
1033 | |
1034 | return 0; | |
1035 | } | |
1036 | ||
1037 | /* sysfs resume/suspend bits for timekeeping */ | |
e1a85b2c | 1038 | static struct syscore_ops timekeeping_syscore_ops = { |
8524070b JS |
1039 | .resume = timekeeping_resume, |
1040 | .suspend = timekeeping_suspend, | |
8524070b JS |
1041 | }; |
1042 | ||
e1a85b2c | 1043 | static int __init timekeeping_init_ops(void) |
8524070b | 1044 | { |
e1a85b2c RW |
1045 | register_syscore_ops(&timekeeping_syscore_ops); |
1046 | return 0; | |
8524070b JS |
1047 | } |
1048 | ||
e1a85b2c | 1049 | device_initcall(timekeeping_init_ops); |
8524070b JS |
1050 | |
1051 | /* | |
1052 | * If the error is already larger, we look ahead even further | |
1053 | * to compensate for late or lost adjustments. | |
1054 | */ | |
f726a697 JS |
1055 | static __always_inline int timekeeping_bigadjust(struct timekeeper *tk, |
1056 | s64 error, s64 *interval, | |
8524070b JS |
1057 | s64 *offset) |
1058 | { | |
1059 | s64 tick_error, i; | |
1060 | u32 look_ahead, adj; | |
1061 | s32 error2, mult; | |
1062 | ||
1063 | /* | |
1064 | * Use the current error value to determine how much to look ahead. | |
1065 | * The larger the error the slower we adjust for it to avoid problems | |
1066 | * with losing too many ticks, otherwise we would overadjust and | |
1067 | * produce an even larger error. The smaller the adjustment the | |
1068 | * faster we try to adjust for it, as lost ticks can do less harm | |
3eb05676 | 1069 | * here. This is tuned so that an error of about 1 msec is adjusted |
8524070b JS |
1070 | * within about 1 sec (or 2^20 nsec in 2^SHIFT_HZ ticks). |
1071 | */ | |
f726a697 | 1072 | error2 = tk->ntp_error >> (NTP_SCALE_SHIFT + 22 - 2 * SHIFT_HZ); |
8524070b JS |
1073 | error2 = abs(error2); |
1074 | for (look_ahead = 0; error2 > 0; look_ahead++) | |
1075 | error2 >>= 2; | |
1076 | ||
1077 | /* | |
1078 | * Now calculate the error in (1 << look_ahead) ticks, but first | |
1079 | * remove the single look ahead already included in the error. | |
1080 | */ | |
f726a697 JS |
1081 | tick_error = ntp_tick_length() >> (tk->ntp_error_shift + 1); |
1082 | tick_error -= tk->xtime_interval >> 1; | |
8524070b JS |
1083 | error = ((error - tick_error) >> look_ahead) + tick_error; |
1084 | ||
1085 | /* Finally calculate the adjustment shift value. */ | |
1086 | i = *interval; | |
1087 | mult = 1; | |
1088 | if (error < 0) { | |
1089 | error = -error; | |
1090 | *interval = -*interval; | |
1091 | *offset = -*offset; | |
1092 | mult = -1; | |
1093 | } | |
1094 | for (adj = 0; error > i; adj++) | |
1095 | error >>= 1; | |
1096 | ||
1097 | *interval <<= adj; | |
1098 | *offset <<= adj; | |
1099 | return mult << adj; | |
1100 | } | |
1101 | ||
1102 | /* | |
1103 | * Adjust the multiplier to reduce the error value, | |
1104 | * this is optimized for the most common adjustments of -1,0,1, | |
1105 | * for other values we can do a bit more work. | |
1106 | */ | |
f726a697 | 1107 | static void timekeeping_adjust(struct timekeeper *tk, s64 offset) |
8524070b | 1108 | { |
f726a697 | 1109 | s64 error, interval = tk->cycle_interval; |
8524070b JS |
1110 | int adj; |
1111 | ||
c2bc1111 | 1112 | /* |
88b28adf | 1113 | * The point of this is to check if the error is greater than half |
c2bc1111 JS |
1114 | * an interval. |
1115 | * | |
1116 | * First we shift it down from NTP_SHIFT to clocksource->shifted nsecs. | |
1117 | * | |
1118 | * Note we subtract one in the shift, so that error is really error*2. | |
3f86f28f JS |
1119 | * This "saves" dividing(shifting) interval twice, but keeps the |
1120 | * (error > interval) comparison as still measuring if error is | |
88b28adf | 1121 | * larger than half an interval. |
c2bc1111 | 1122 | * |
3f86f28f | 1123 | * Note: It does not "save" on aggravation when reading the code. |
c2bc1111 | 1124 | */ |
f726a697 | 1125 | error = tk->ntp_error >> (tk->ntp_error_shift - 1); |
8524070b | 1126 | if (error > interval) { |
c2bc1111 JS |
1127 | /* |
1128 | * We now divide error by 4(via shift), which checks if | |
88b28adf | 1129 | * the error is greater than twice the interval. |
c2bc1111 JS |
1130 | * If it is greater, we need a bigadjust, if its smaller, |
1131 | * we can adjust by 1. | |
1132 | */ | |
8524070b | 1133 | error >>= 2; |
c2bc1111 JS |
1134 | /* |
1135 | * XXX - In update_wall_time, we round up to the next | |
1136 | * nanosecond, and store the amount rounded up into | |
1137 | * the error. This causes the likely below to be unlikely. | |
1138 | * | |
3f86f28f | 1139 | * The proper fix is to avoid rounding up by using |
4e250fdd | 1140 | * the high precision tk->xtime_nsec instead of |
c2bc1111 JS |
1141 | * xtime.tv_nsec everywhere. Fixing this will take some |
1142 | * time. | |
1143 | */ | |
8524070b JS |
1144 | if (likely(error <= interval)) |
1145 | adj = 1; | |
1146 | else | |
1d17d174 IM |
1147 | adj = timekeeping_bigadjust(tk, error, &interval, &offset); |
1148 | } else { | |
1149 | if (error < -interval) { | |
1150 | /* See comment above, this is just switched for the negative */ | |
1151 | error >>= 2; | |
1152 | if (likely(error >= -interval)) { | |
1153 | adj = -1; | |
1154 | interval = -interval; | |
1155 | offset = -offset; | |
1156 | } else { | |
1157 | adj = timekeeping_bigadjust(tk, error, &interval, &offset); | |
1158 | } | |
1159 | } else { | |
1160 | goto out_adjust; | |
1161 | } | |
1162 | } | |
8524070b | 1163 | |
f726a697 JS |
1164 | if (unlikely(tk->clock->maxadj && |
1165 | (tk->mult + adj > tk->clock->mult + tk->clock->maxadj))) { | |
e919cfd4 JS |
1166 | printk_once(KERN_WARNING |
1167 | "Adjusting %s more than 11%% (%ld vs %ld)\n", | |
f726a697 JS |
1168 | tk->clock->name, (long)tk->mult + adj, |
1169 | (long)tk->clock->mult + tk->clock->maxadj); | |
e919cfd4 | 1170 | } |
c2bc1111 JS |
1171 | /* |
1172 | * So the following can be confusing. | |
1173 | * | |
1174 | * To keep things simple, lets assume adj == 1 for now. | |
1175 | * | |
1176 | * When adj != 1, remember that the interval and offset values | |
1177 | * have been appropriately scaled so the math is the same. | |
1178 | * | |
1179 | * The basic idea here is that we're increasing the multiplier | |
1180 | * by one, this causes the xtime_interval to be incremented by | |
1181 | * one cycle_interval. This is because: | |
1182 | * xtime_interval = cycle_interval * mult | |
1183 | * So if mult is being incremented by one: | |
1184 | * xtime_interval = cycle_interval * (mult + 1) | |
1185 | * Its the same as: | |
1186 | * xtime_interval = (cycle_interval * mult) + cycle_interval | |
1187 | * Which can be shortened to: | |
1188 | * xtime_interval += cycle_interval | |
1189 | * | |
1190 | * So offset stores the non-accumulated cycles. Thus the current | |
1191 | * time (in shifted nanoseconds) is: | |
1192 | * now = (offset * adj) + xtime_nsec | |
1193 | * Now, even though we're adjusting the clock frequency, we have | |
1194 | * to keep time consistent. In other words, we can't jump back | |
1195 | * in time, and we also want to avoid jumping forward in time. | |
1196 | * | |
1197 | * So given the same offset value, we need the time to be the same | |
1198 | * both before and after the freq adjustment. | |
1199 | * now = (offset * adj_1) + xtime_nsec_1 | |
1200 | * now = (offset * adj_2) + xtime_nsec_2 | |
1201 | * So: | |
1202 | * (offset * adj_1) + xtime_nsec_1 = | |
1203 | * (offset * adj_2) + xtime_nsec_2 | |
1204 | * And we know: | |
1205 | * adj_2 = adj_1 + 1 | |
1206 | * So: | |
1207 | * (offset * adj_1) + xtime_nsec_1 = | |
1208 | * (offset * (adj_1+1)) + xtime_nsec_2 | |
1209 | * (offset * adj_1) + xtime_nsec_1 = | |
1210 | * (offset * adj_1) + offset + xtime_nsec_2 | |
1211 | * Canceling the sides: | |
1212 | * xtime_nsec_1 = offset + xtime_nsec_2 | |
1213 | * Which gives us: | |
1214 | * xtime_nsec_2 = xtime_nsec_1 - offset | |
1215 | * Which simplfies to: | |
1216 | * xtime_nsec -= offset | |
1217 | * | |
1218 | * XXX - TODO: Doc ntp_error calculation. | |
1219 | */ | |
f726a697 JS |
1220 | tk->mult += adj; |
1221 | tk->xtime_interval += interval; | |
1222 | tk->xtime_nsec -= offset; | |
1223 | tk->ntp_error -= (interval - offset) << tk->ntp_error_shift; | |
2a8c0883 | 1224 | |
1d17d174 | 1225 | out_adjust: |
2a8c0883 JS |
1226 | /* |
1227 | * It may be possible that when we entered this function, xtime_nsec | |
1228 | * was very small. Further, if we're slightly speeding the clocksource | |
1229 | * in the code above, its possible the required corrective factor to | |
1230 | * xtime_nsec could cause it to underflow. | |
1231 | * | |
1232 | * Now, since we already accumulated the second, cannot simply roll | |
1233 | * the accumulated second back, since the NTP subsystem has been | |
1234 | * notified via second_overflow. So instead we push xtime_nsec forward | |
1235 | * by the amount we underflowed, and add that amount into the error. | |
1236 | * | |
1237 | * We'll correct this error next time through this function, when | |
1238 | * xtime_nsec is not as small. | |
1239 | */ | |
f726a697 JS |
1240 | if (unlikely((s64)tk->xtime_nsec < 0)) { |
1241 | s64 neg = -(s64)tk->xtime_nsec; | |
1242 | tk->xtime_nsec = 0; | |
1243 | tk->ntp_error += neg << tk->ntp_error_shift; | |
2a8c0883 JS |
1244 | } |
1245 | ||
8524070b JS |
1246 | } |
1247 | ||
1f4f9487 JS |
1248 | /** |
1249 | * accumulate_nsecs_to_secs - Accumulates nsecs into secs | |
1250 | * | |
1251 | * Helper function that accumulates a the nsecs greater then a second | |
1252 | * from the xtime_nsec field to the xtime_secs field. | |
1253 | * It also calls into the NTP code to handle leapsecond processing. | |
1254 | * | |
1255 | */ | |
780427f0 | 1256 | static inline unsigned int accumulate_nsecs_to_secs(struct timekeeper *tk) |
1f4f9487 JS |
1257 | { |
1258 | u64 nsecps = (u64)NSEC_PER_SEC << tk->shift; | |
5258d3f2 | 1259 | unsigned int clock_set = 0; |
1f4f9487 JS |
1260 | |
1261 | while (tk->xtime_nsec >= nsecps) { | |
1262 | int leap; | |
1263 | ||
1264 | tk->xtime_nsec -= nsecps; | |
1265 | tk->xtime_sec++; | |
1266 | ||
1267 | /* Figure out if its a leap sec and apply if needed */ | |
1268 | leap = second_overflow(tk->xtime_sec); | |
6d0ef903 JS |
1269 | if (unlikely(leap)) { |
1270 | struct timespec ts; | |
1271 | ||
1272 | tk->xtime_sec += leap; | |
1f4f9487 | 1273 | |
6d0ef903 JS |
1274 | ts.tv_sec = leap; |
1275 | ts.tv_nsec = 0; | |
1276 | tk_set_wall_to_mono(tk, | |
1277 | timespec_sub(tk->wall_to_monotonic, ts)); | |
1278 | ||
cc244dda JS |
1279 | __timekeeping_set_tai_offset(tk, tk->tai_offset - leap); |
1280 | ||
5258d3f2 | 1281 | clock_set = TK_CLOCK_WAS_SET; |
6d0ef903 | 1282 | } |
1f4f9487 | 1283 | } |
5258d3f2 | 1284 | return clock_set; |
1f4f9487 JS |
1285 | } |
1286 | ||
a092ff0f JS |
1287 | /** |
1288 | * logarithmic_accumulation - shifted accumulation of cycles | |
1289 | * | |
1290 | * This functions accumulates a shifted interval of cycles into | |
1291 | * into a shifted interval nanoseconds. Allows for O(log) accumulation | |
1292 | * loop. | |
1293 | * | |
1294 | * Returns the unconsumed cycles. | |
1295 | */ | |
f726a697 | 1296 | static cycle_t logarithmic_accumulation(struct timekeeper *tk, cycle_t offset, |
5258d3f2 JS |
1297 | u32 shift, |
1298 | unsigned int *clock_set) | |
a092ff0f | 1299 | { |
23a9537a | 1300 | cycle_t interval = tk->cycle_interval << shift; |
deda2e81 | 1301 | u64 raw_nsecs; |
a092ff0f | 1302 | |
f726a697 | 1303 | /* If the offset is smaller then a shifted interval, do nothing */ |
23a9537a | 1304 | if (offset < interval) |
a092ff0f JS |
1305 | return offset; |
1306 | ||
1307 | /* Accumulate one shifted interval */ | |
23a9537a | 1308 | offset -= interval; |
7ec98e15 | 1309 | tk->cycle_last += interval; |
a092ff0f | 1310 | |
f726a697 | 1311 | tk->xtime_nsec += tk->xtime_interval << shift; |
5258d3f2 | 1312 | *clock_set |= accumulate_nsecs_to_secs(tk); |
a092ff0f | 1313 | |
deda2e81 | 1314 | /* Accumulate raw time */ |
5b3900cd | 1315 | raw_nsecs = (u64)tk->raw_interval << shift; |
f726a697 | 1316 | raw_nsecs += tk->raw_time.tv_nsec; |
c7dcf87a JS |
1317 | if (raw_nsecs >= NSEC_PER_SEC) { |
1318 | u64 raw_secs = raw_nsecs; | |
1319 | raw_nsecs = do_div(raw_secs, NSEC_PER_SEC); | |
f726a697 | 1320 | tk->raw_time.tv_sec += raw_secs; |
a092ff0f | 1321 | } |
f726a697 | 1322 | tk->raw_time.tv_nsec = raw_nsecs; |
a092ff0f JS |
1323 | |
1324 | /* Accumulate error between NTP and clock interval */ | |
f726a697 JS |
1325 | tk->ntp_error += ntp_tick_length() << shift; |
1326 | tk->ntp_error -= (tk->xtime_interval + tk->xtime_remainder) << | |
1327 | (tk->ntp_error_shift + shift); | |
a092ff0f JS |
1328 | |
1329 | return offset; | |
1330 | } | |
1331 | ||
92bb1fcf JS |
1332 | #ifdef CONFIG_GENERIC_TIME_VSYSCALL_OLD |
1333 | static inline void old_vsyscall_fixup(struct timekeeper *tk) | |
1334 | { | |
1335 | s64 remainder; | |
1336 | ||
1337 | /* | |
1338 | * Store only full nanoseconds into xtime_nsec after rounding | |
1339 | * it up and add the remainder to the error difference. | |
1340 | * XXX - This is necessary to avoid small 1ns inconsistnecies caused | |
1341 | * by truncating the remainder in vsyscalls. However, it causes | |
1342 | * additional work to be done in timekeeping_adjust(). Once | |
1343 | * the vsyscall implementations are converted to use xtime_nsec | |
1344 | * (shifted nanoseconds), and CONFIG_GENERIC_TIME_VSYSCALL_OLD | |
1345 | * users are removed, this can be killed. | |
1346 | */ | |
1347 | remainder = tk->xtime_nsec & ((1ULL << tk->shift) - 1); | |
1348 | tk->xtime_nsec -= remainder; | |
1349 | tk->xtime_nsec += 1ULL << tk->shift; | |
1350 | tk->ntp_error += remainder << tk->ntp_error_shift; | |
1351 | ||
1352 | } | |
1353 | #else | |
1354 | #define old_vsyscall_fixup(tk) | |
1355 | #endif | |
1356 | ||
1357 | ||
1358 | ||
8524070b JS |
1359 | /** |
1360 | * update_wall_time - Uses the current clocksource to increment the wall time | |
1361 | * | |
8524070b | 1362 | */ |
47a1b796 | 1363 | void update_wall_time(void) |
8524070b | 1364 | { |
155ec602 | 1365 | struct clocksource *clock; |
48cdc135 TG |
1366 | struct timekeeper *real_tk = &timekeeper; |
1367 | struct timekeeper *tk = &shadow_timekeeper; | |
8524070b | 1368 | cycle_t offset; |
a092ff0f | 1369 | int shift = 0, maxshift; |
5258d3f2 | 1370 | unsigned int clock_set = 0; |
70471f2f JS |
1371 | unsigned long flags; |
1372 | ||
9a7a71b1 | 1373 | raw_spin_lock_irqsave(&timekeeper_lock, flags); |
8524070b JS |
1374 | |
1375 | /* Make sure we're fully resumed: */ | |
1376 | if (unlikely(timekeeping_suspended)) | |
70471f2f | 1377 | goto out; |
8524070b | 1378 | |
48cdc135 | 1379 | clock = real_tk->clock; |
592913ec JS |
1380 | |
1381 | #ifdef CONFIG_ARCH_USES_GETTIMEOFFSET | |
48cdc135 | 1382 | offset = real_tk->cycle_interval; |
592913ec JS |
1383 | #else |
1384 | offset = (clock->read(clock) - clock->cycle_last) & clock->mask; | |
8524070b | 1385 | #endif |
8524070b | 1386 | |
bf2ac312 | 1387 | /* Check if there's really nothing to do */ |
48cdc135 | 1388 | if (offset < real_tk->cycle_interval) |
bf2ac312 JS |
1389 | goto out; |
1390 | ||
a092ff0f JS |
1391 | /* |
1392 | * With NO_HZ we may have to accumulate many cycle_intervals | |
1393 | * (think "ticks") worth of time at once. To do this efficiently, | |
1394 | * we calculate the largest doubling multiple of cycle_intervals | |
88b28adf | 1395 | * that is smaller than the offset. We then accumulate that |
a092ff0f JS |
1396 | * chunk in one go, and then try to consume the next smaller |
1397 | * doubled multiple. | |
8524070b | 1398 | */ |
4e250fdd | 1399 | shift = ilog2(offset) - ilog2(tk->cycle_interval); |
a092ff0f | 1400 | shift = max(0, shift); |
88b28adf | 1401 | /* Bound shift to one less than what overflows tick_length */ |
ea7cf49a | 1402 | maxshift = (64 - (ilog2(ntp_tick_length())+1)) - 1; |
a092ff0f | 1403 | shift = min(shift, maxshift); |
4e250fdd | 1404 | while (offset >= tk->cycle_interval) { |
5258d3f2 JS |
1405 | offset = logarithmic_accumulation(tk, offset, shift, |
1406 | &clock_set); | |
4e250fdd | 1407 | if (offset < tk->cycle_interval<<shift) |
830ec045 | 1408 | shift--; |
8524070b JS |
1409 | } |
1410 | ||
1411 | /* correct the clock when NTP error is too big */ | |
4e250fdd | 1412 | timekeeping_adjust(tk, offset); |
8524070b | 1413 | |
6a867a39 | 1414 | /* |
92bb1fcf JS |
1415 | * XXX This can be killed once everyone converts |
1416 | * to the new update_vsyscall. | |
1417 | */ | |
1418 | old_vsyscall_fixup(tk); | |
8524070b | 1419 | |
6a867a39 JS |
1420 | /* |
1421 | * Finally, make sure that after the rounding | |
1e75fa8b | 1422 | * xtime_nsec isn't larger than NSEC_PER_SEC |
6a867a39 | 1423 | */ |
5258d3f2 | 1424 | clock_set |= accumulate_nsecs_to_secs(tk); |
83f57a11 | 1425 | |
ca4523cd | 1426 | write_seqcount_begin(&timekeeper_seq); |
7ec98e15 TG |
1427 | /* Update clock->cycle_last with the new value */ |
1428 | clock->cycle_last = tk->cycle_last; | |
48cdc135 TG |
1429 | /* |
1430 | * Update the real timekeeper. | |
1431 | * | |
1432 | * We could avoid this memcpy by switching pointers, but that | |
1433 | * requires changes to all other timekeeper usage sites as | |
1434 | * well, i.e. move the timekeeper pointer getter into the | |
1435 | * spinlocked/seqcount protected sections. And we trade this | |
1436 | * memcpy under the timekeeper_seq against one before we start | |
1437 | * updating. | |
1438 | */ | |
1439 | memcpy(real_tk, tk, sizeof(*tk)); | |
5258d3f2 | 1440 | timekeeping_update(real_tk, clock_set); |
9a7a71b1 | 1441 | write_seqcount_end(&timekeeper_seq); |
ca4523cd | 1442 | out: |
9a7a71b1 | 1443 | raw_spin_unlock_irqrestore(&timekeeper_lock, flags); |
47a1b796 JS |
1444 | if (clock_set) |
1445 | clock_was_set(); | |
8524070b | 1446 | } |
7c3f1a57 TJ |
1447 | |
1448 | /** | |
1449 | * getboottime - Return the real time of system boot. | |
1450 | * @ts: pointer to the timespec to be set | |
1451 | * | |
abb3a4ea | 1452 | * Returns the wall-time of boot in a timespec. |
7c3f1a57 TJ |
1453 | * |
1454 | * This is based on the wall_to_monotonic offset and the total suspend | |
1455 | * time. Calls to settimeofday will affect the value returned (which | |
1456 | * basically means that however wrong your real time clock is at boot time, | |
1457 | * you get the right time here). | |
1458 | */ | |
1459 | void getboottime(struct timespec *ts) | |
1460 | { | |
4e250fdd | 1461 | struct timekeeper *tk = &timekeeper; |
36d47481 | 1462 | struct timespec boottime = { |
4e250fdd JS |
1463 | .tv_sec = tk->wall_to_monotonic.tv_sec + |
1464 | tk->total_sleep_time.tv_sec, | |
1465 | .tv_nsec = tk->wall_to_monotonic.tv_nsec + | |
1466 | tk->total_sleep_time.tv_nsec | |
36d47481 | 1467 | }; |
d4f587c6 | 1468 | |
d4f587c6 | 1469 | set_normalized_timespec(ts, -boottime.tv_sec, -boottime.tv_nsec); |
7c3f1a57 | 1470 | } |
c93d89f3 | 1471 | EXPORT_SYMBOL_GPL(getboottime); |
7c3f1a57 | 1472 | |
abb3a4ea JS |
1473 | /** |
1474 | * get_monotonic_boottime - Returns monotonic time since boot | |
1475 | * @ts: pointer to the timespec to be set | |
1476 | * | |
1477 | * Returns the monotonic time since boot in a timespec. | |
1478 | * | |
1479 | * This is similar to CLOCK_MONTONIC/ktime_get_ts, but also | |
1480 | * includes the time spent in suspend. | |
1481 | */ | |
1482 | void get_monotonic_boottime(struct timespec *ts) | |
1483 | { | |
4e250fdd | 1484 | struct timekeeper *tk = &timekeeper; |
abb3a4ea | 1485 | struct timespec tomono, sleep; |
ec145bab | 1486 | s64 nsec; |
abb3a4ea | 1487 | unsigned int seq; |
abb3a4ea JS |
1488 | |
1489 | WARN_ON(timekeeping_suspended); | |
1490 | ||
1491 | do { | |
9a7a71b1 | 1492 | seq = read_seqcount_begin(&timekeeper_seq); |
4e250fdd | 1493 | ts->tv_sec = tk->xtime_sec; |
ec145bab | 1494 | nsec = timekeeping_get_ns(tk); |
4e250fdd JS |
1495 | tomono = tk->wall_to_monotonic; |
1496 | sleep = tk->total_sleep_time; | |
abb3a4ea | 1497 | |
9a7a71b1 | 1498 | } while (read_seqcount_retry(&timekeeper_seq, seq)); |
abb3a4ea | 1499 | |
ec145bab JS |
1500 | ts->tv_sec += tomono.tv_sec + sleep.tv_sec; |
1501 | ts->tv_nsec = 0; | |
1502 | timespec_add_ns(ts, nsec + tomono.tv_nsec + sleep.tv_nsec); | |
abb3a4ea JS |
1503 | } |
1504 | EXPORT_SYMBOL_GPL(get_monotonic_boottime); | |
1505 | ||
1506 | /** | |
1507 | * ktime_get_boottime - Returns monotonic time since boot in a ktime | |
1508 | * | |
1509 | * Returns the monotonic time since boot in a ktime | |
1510 | * | |
1511 | * This is similar to CLOCK_MONTONIC/ktime_get, but also | |
1512 | * includes the time spent in suspend. | |
1513 | */ | |
1514 | ktime_t ktime_get_boottime(void) | |
1515 | { | |
1516 | struct timespec ts; | |
1517 | ||
1518 | get_monotonic_boottime(&ts); | |
1519 | return timespec_to_ktime(ts); | |
1520 | } | |
1521 | EXPORT_SYMBOL_GPL(ktime_get_boottime); | |
1522 | ||
7c3f1a57 TJ |
1523 | /** |
1524 | * monotonic_to_bootbased - Convert the monotonic time to boot based. | |
1525 | * @ts: pointer to the timespec to be converted | |
1526 | */ | |
1527 | void monotonic_to_bootbased(struct timespec *ts) | |
1528 | { | |
4e250fdd JS |
1529 | struct timekeeper *tk = &timekeeper; |
1530 | ||
1531 | *ts = timespec_add(*ts, tk->total_sleep_time); | |
7c3f1a57 | 1532 | } |
c93d89f3 | 1533 | EXPORT_SYMBOL_GPL(monotonic_to_bootbased); |
2c6b47de | 1534 | |
17c38b74 JS |
1535 | unsigned long get_seconds(void) |
1536 | { | |
4e250fdd JS |
1537 | struct timekeeper *tk = &timekeeper; |
1538 | ||
1539 | return tk->xtime_sec; | |
17c38b74 JS |
1540 | } |
1541 | EXPORT_SYMBOL(get_seconds); | |
1542 | ||
da15cfda JS |
1543 | struct timespec __current_kernel_time(void) |
1544 | { | |
4e250fdd JS |
1545 | struct timekeeper *tk = &timekeeper; |
1546 | ||
1547 | return tk_xtime(tk); | |
da15cfda | 1548 | } |
17c38b74 | 1549 | |
2c6b47de JS |
1550 | struct timespec current_kernel_time(void) |
1551 | { | |
4e250fdd | 1552 | struct timekeeper *tk = &timekeeper; |
2c6b47de JS |
1553 | struct timespec now; |
1554 | unsigned long seq; | |
1555 | ||
1556 | do { | |
9a7a71b1 | 1557 | seq = read_seqcount_begin(&timekeeper_seq); |
83f57a11 | 1558 | |
4e250fdd | 1559 | now = tk_xtime(tk); |
9a7a71b1 | 1560 | } while (read_seqcount_retry(&timekeeper_seq, seq)); |
2c6b47de JS |
1561 | |
1562 | return now; | |
1563 | } | |
2c6b47de | 1564 | EXPORT_SYMBOL(current_kernel_time); |
da15cfda JS |
1565 | |
1566 | struct timespec get_monotonic_coarse(void) | |
1567 | { | |
4e250fdd | 1568 | struct timekeeper *tk = &timekeeper; |
da15cfda JS |
1569 | struct timespec now, mono; |
1570 | unsigned long seq; | |
1571 | ||
1572 | do { | |
9a7a71b1 | 1573 | seq = read_seqcount_begin(&timekeeper_seq); |
83f57a11 | 1574 | |
4e250fdd JS |
1575 | now = tk_xtime(tk); |
1576 | mono = tk->wall_to_monotonic; | |
9a7a71b1 | 1577 | } while (read_seqcount_retry(&timekeeper_seq, seq)); |
da15cfda JS |
1578 | |
1579 | set_normalized_timespec(&now, now.tv_sec + mono.tv_sec, | |
1580 | now.tv_nsec + mono.tv_nsec); | |
1581 | return now; | |
1582 | } | |
871cf1e5 TH |
1583 | |
1584 | /* | |
d6ad4187 | 1585 | * Must hold jiffies_lock |
871cf1e5 TH |
1586 | */ |
1587 | void do_timer(unsigned long ticks) | |
1588 | { | |
1589 | jiffies_64 += ticks; | |
871cf1e5 TH |
1590 | calc_global_load(ticks); |
1591 | } | |
48cf76f7 TH |
1592 | |
1593 | /** | |
314ac371 JS |
1594 | * get_xtime_and_monotonic_and_sleep_offset() - get xtime, wall_to_monotonic, |
1595 | * and sleep offsets. | |
48cf76f7 TH |
1596 | * @xtim: pointer to timespec to be set with xtime |
1597 | * @wtom: pointer to timespec to be set with wall_to_monotonic | |
314ac371 | 1598 | * @sleep: pointer to timespec to be set with time in suspend |
48cf76f7 | 1599 | */ |
314ac371 JS |
1600 | void get_xtime_and_monotonic_and_sleep_offset(struct timespec *xtim, |
1601 | struct timespec *wtom, struct timespec *sleep) | |
48cf76f7 | 1602 | { |
4e250fdd | 1603 | struct timekeeper *tk = &timekeeper; |
48cf76f7 TH |
1604 | unsigned long seq; |
1605 | ||
1606 | do { | |
9a7a71b1 | 1607 | seq = read_seqcount_begin(&timekeeper_seq); |
4e250fdd JS |
1608 | *xtim = tk_xtime(tk); |
1609 | *wtom = tk->wall_to_monotonic; | |
1610 | *sleep = tk->total_sleep_time; | |
9a7a71b1 | 1611 | } while (read_seqcount_retry(&timekeeper_seq, seq)); |
48cf76f7 | 1612 | } |
f0af911a | 1613 | |
f6c06abf TG |
1614 | #ifdef CONFIG_HIGH_RES_TIMERS |
1615 | /** | |
1616 | * ktime_get_update_offsets - hrtimer helper | |
1617 | * @offs_real: pointer to storage for monotonic -> realtime offset | |
1618 | * @offs_boot: pointer to storage for monotonic -> boottime offset | |
b7bc50e4 | 1619 | * @offs_tai: pointer to storage for monotonic -> clock tai offset |
f6c06abf TG |
1620 | * |
1621 | * Returns current monotonic time and updates the offsets | |
b7bc50e4 | 1622 | * Called from hrtimer_interrupt() or retrigger_next_event() |
f6c06abf | 1623 | */ |
90adda98 JS |
1624 | ktime_t ktime_get_update_offsets(ktime_t *offs_real, ktime_t *offs_boot, |
1625 | ktime_t *offs_tai) | |
f6c06abf | 1626 | { |
4e250fdd | 1627 | struct timekeeper *tk = &timekeeper; |
f6c06abf TG |
1628 | ktime_t now; |
1629 | unsigned int seq; | |
1630 | u64 secs, nsecs; | |
1631 | ||
1632 | do { | |
9a7a71b1 | 1633 | seq = read_seqcount_begin(&timekeeper_seq); |
f6c06abf | 1634 | |
4e250fdd JS |
1635 | secs = tk->xtime_sec; |
1636 | nsecs = timekeeping_get_ns(tk); | |
f6c06abf | 1637 | |
4e250fdd JS |
1638 | *offs_real = tk->offs_real; |
1639 | *offs_boot = tk->offs_boot; | |
90adda98 | 1640 | *offs_tai = tk->offs_tai; |
9a7a71b1 | 1641 | } while (read_seqcount_retry(&timekeeper_seq, seq)); |
f6c06abf TG |
1642 | |
1643 | now = ktime_add_ns(ktime_set(secs, 0), nsecs); | |
1644 | now = ktime_sub(now, *offs_real); | |
1645 | return now; | |
1646 | } | |
1647 | #endif | |
1648 | ||
99ee5315 TG |
1649 | /** |
1650 | * ktime_get_monotonic_offset() - get wall_to_monotonic in ktime_t format | |
1651 | */ | |
1652 | ktime_t ktime_get_monotonic_offset(void) | |
1653 | { | |
4e250fdd | 1654 | struct timekeeper *tk = &timekeeper; |
99ee5315 TG |
1655 | unsigned long seq; |
1656 | struct timespec wtom; | |
1657 | ||
1658 | do { | |
9a7a71b1 | 1659 | seq = read_seqcount_begin(&timekeeper_seq); |
4e250fdd | 1660 | wtom = tk->wall_to_monotonic; |
9a7a71b1 | 1661 | } while (read_seqcount_retry(&timekeeper_seq, seq)); |
70471f2f | 1662 | |
99ee5315 TG |
1663 | return timespec_to_ktime(wtom); |
1664 | } | |
a80b83b7 JS |
1665 | EXPORT_SYMBOL_GPL(ktime_get_monotonic_offset); |
1666 | ||
aa6f9c59 JS |
1667 | /** |
1668 | * do_adjtimex() - Accessor function to NTP __do_adjtimex function | |
1669 | */ | |
1670 | int do_adjtimex(struct timex *txc) | |
1671 | { | |
0b5154fb | 1672 | struct timekeeper *tk = &timekeeper; |
06c017fd | 1673 | unsigned long flags; |
87ace39b | 1674 | struct timespec ts; |
4e8f8b34 | 1675 | s32 orig_tai, tai; |
e4085693 JS |
1676 | int ret; |
1677 | ||
1678 | /* Validate the data before disabling interrupts */ | |
1679 | ret = ntp_validate_timex(txc); | |
1680 | if (ret) | |
1681 | return ret; | |
1682 | ||
cef90377 JS |
1683 | if (txc->modes & ADJ_SETOFFSET) { |
1684 | struct timespec delta; | |
1685 | delta.tv_sec = txc->time.tv_sec; | |
1686 | delta.tv_nsec = txc->time.tv_usec; | |
1687 | if (!(txc->modes & ADJ_NANO)) | |
1688 | delta.tv_nsec *= 1000; | |
1689 | ret = timekeeping_inject_offset(&delta); | |
1690 | if (ret) | |
1691 | return ret; | |
1692 | } | |
1693 | ||
87ace39b | 1694 | getnstimeofday(&ts); |
87ace39b | 1695 | |
06c017fd JS |
1696 | raw_spin_lock_irqsave(&timekeeper_lock, flags); |
1697 | write_seqcount_begin(&timekeeper_seq); | |
1698 | ||
4e8f8b34 | 1699 | orig_tai = tai = tk->tai_offset; |
87ace39b | 1700 | ret = __do_adjtimex(txc, &ts, &tai); |
aa6f9c59 | 1701 | |
4e8f8b34 JS |
1702 | if (tai != orig_tai) { |
1703 | __timekeeping_set_tai_offset(tk, tai); | |
f55c0760 | 1704 | timekeeping_update(tk, TK_MIRROR | TK_CLOCK_WAS_SET); |
4e8f8b34 | 1705 | } |
06c017fd JS |
1706 | write_seqcount_end(&timekeeper_seq); |
1707 | raw_spin_unlock_irqrestore(&timekeeper_lock, flags); | |
1708 | ||
6fdda9a9 JS |
1709 | if (tai != orig_tai) |
1710 | clock_was_set(); | |
1711 | ||
7bd36014 JS |
1712 | ntp_notify_cmos_timer(); |
1713 | ||
87ace39b JS |
1714 | return ret; |
1715 | } | |
aa6f9c59 JS |
1716 | |
1717 | #ifdef CONFIG_NTP_PPS | |
1718 | /** | |
1719 | * hardpps() - Accessor function to NTP __hardpps function | |
1720 | */ | |
1721 | void hardpps(const struct timespec *phase_ts, const struct timespec *raw_ts) | |
1722 | { | |
06c017fd JS |
1723 | unsigned long flags; |
1724 | ||
1725 | raw_spin_lock_irqsave(&timekeeper_lock, flags); | |
1726 | write_seqcount_begin(&timekeeper_seq); | |
1727 | ||
aa6f9c59 | 1728 | __hardpps(phase_ts, raw_ts); |
06c017fd JS |
1729 | |
1730 | write_seqcount_end(&timekeeper_seq); | |
1731 | raw_spin_unlock_irqrestore(&timekeeper_lock, flags); | |
aa6f9c59 JS |
1732 | } |
1733 | EXPORT_SYMBOL(hardpps); | |
1734 | #endif | |
1735 | ||
f0af911a TH |
1736 | /** |
1737 | * xtime_update() - advances the timekeeping infrastructure | |
1738 | * @ticks: number of ticks, that have elapsed since the last call. | |
1739 | * | |
1740 | * Must be called with interrupts disabled. | |
1741 | */ | |
1742 | void xtime_update(unsigned long ticks) | |
1743 | { | |
d6ad4187 | 1744 | write_seqlock(&jiffies_lock); |
f0af911a | 1745 | do_timer(ticks); |
d6ad4187 | 1746 | write_sequnlock(&jiffies_lock); |
47a1b796 | 1747 | update_wall_time(); |
f0af911a | 1748 | } |