Commit | Line | Data |
---|---|---|
8524070b | 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 | 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 | 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> |
52f5684c | 25 | #include <linux/compiler.h> |
8524070b | 26 | |
eb93e4d9 | 27 | #include "tick-internal.h" |
aa6f9c59 | 28 | #include "ntp_internal.h" |
5c83545f | 29 | #include "timekeeping_internal.h" |
155ec602 | 30 | |
04397fe9 DV |
31 | #define TK_CLEAR_NTP (1 << 0) |
32 | #define TK_MIRROR (1 << 1) | |
780427f0 | 33 | #define TK_CLOCK_WAS_SET (1 << 2) |
04397fe9 | 34 | |
afa14e7c | 35 | static struct timekeeper timekeeper; |
9a7a71b1 TG |
36 | static DEFINE_RAW_SPINLOCK(timekeeper_lock); |
37 | static seqcount_t timekeeper_seq; | |
48cdc135 | 38 | static struct timekeeper shadow_timekeeper; |
155ec602 | 39 | |
8fcce546 JS |
40 | /* flag for if timekeeping is suspended */ |
41 | int __read_mostly timekeeping_suspended; | |
42 | ||
31ade306 FT |
43 | /* Flag for if there is a persistent clock on this platform */ |
44 | bool __read_mostly persistent_clock_exist = false; | |
45 | ||
1e75fa8b JS |
46 | static inline void tk_normalize_xtime(struct timekeeper *tk) |
47 | { | |
48 | while (tk->xtime_nsec >= ((u64)NSEC_PER_SEC << tk->shift)) { | |
49 | tk->xtime_nsec -= (u64)NSEC_PER_SEC << tk->shift; | |
50 | tk->xtime_sec++; | |
51 | } | |
52 | } | |
53 | ||
1e75fa8b JS |
54 | static void tk_set_xtime(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; |
1e75fa8b JS |
58 | } |
59 | ||
60 | static void tk_xtime_add(struct timekeeper *tk, const struct timespec *ts) | |
61 | { | |
62 | tk->xtime_sec += ts->tv_sec; | |
b44d50dc | 63 | tk->xtime_nsec += (u64)ts->tv_nsec << tk->shift; |
784ffcbb | 64 | tk_normalize_xtime(tk); |
1e75fa8b | 65 | } |
8fcce546 | 66 | |
6d0ef903 JS |
67 | static void tk_set_wall_to_mono(struct timekeeper *tk, struct timespec wtm) |
68 | { | |
69 | struct timespec tmp; | |
70 | ||
71 | /* | |
72 | * Verify consistency of: offset_real = -wall_to_monotonic | |
73 | * before modifying anything | |
74 | */ | |
75 | set_normalized_timespec(&tmp, -tk->wall_to_monotonic.tv_sec, | |
76 | -tk->wall_to_monotonic.tv_nsec); | |
77 | WARN_ON_ONCE(tk->offs_real.tv64 != timespec_to_ktime(tmp).tv64); | |
78 | tk->wall_to_monotonic = wtm; | |
79 | set_normalized_timespec(&tmp, -wtm.tv_sec, -wtm.tv_nsec); | |
80 | tk->offs_real = timespec_to_ktime(tmp); | |
04005f60 | 81 | tk->offs_tai = ktime_add(tk->offs_real, ktime_set(tk->tai_offset, 0)); |
6d0ef903 JS |
82 | } |
83 | ||
84 | static void tk_set_sleep_time(struct timekeeper *tk, struct timespec t) | |
85 | { | |
86 | /* Verify consistency before modifying */ | |
87 | WARN_ON_ONCE(tk->offs_boot.tv64 != timespec_to_ktime(tk->total_sleep_time).tv64); | |
88 | ||
89 | tk->total_sleep_time = t; | |
90 | tk->offs_boot = timespec_to_ktime(t); | |
91 | } | |
92 | ||
155ec602 | 93 | /** |
d26e4fe0 | 94 | * tk_setup_internals - Set up internals to use clocksource clock. |
155ec602 | 95 | * |
d26e4fe0 | 96 | * @tk: The target timekeeper to setup. |
155ec602 MS |
97 | * @clock: Pointer to clocksource. |
98 | * | |
99 | * Calculates a fixed cycle/nsec interval for a given clocksource/adjustment | |
100 | * pair and interval request. | |
101 | * | |
102 | * Unless you're the timekeeping code, you should not be using this! | |
103 | */ | |
f726a697 | 104 | static void tk_setup_internals(struct timekeeper *tk, struct clocksource *clock) |
155ec602 MS |
105 | { |
106 | cycle_t interval; | |
a386b5af | 107 | u64 tmp, ntpinterval; |
1e75fa8b | 108 | struct clocksource *old_clock; |
155ec602 | 109 | |
f726a697 JS |
110 | old_clock = tk->clock; |
111 | tk->clock = clock; | |
14a3b6ab | 112 | tk->cycle_last = clock->cycle_last = clock->read(clock); |
155ec602 MS |
113 | |
114 | /* Do the ns -> cycle conversion first, using original mult */ | |
115 | tmp = NTP_INTERVAL_LENGTH; | |
116 | tmp <<= clock->shift; | |
a386b5af | 117 | ntpinterval = tmp; |
0a544198 MS |
118 | tmp += clock->mult/2; |
119 | do_div(tmp, clock->mult); | |
155ec602 MS |
120 | if (tmp == 0) |
121 | tmp = 1; | |
122 | ||
123 | interval = (cycle_t) tmp; | |
f726a697 | 124 | tk->cycle_interval = interval; |
155ec602 MS |
125 | |
126 | /* Go back from cycles -> shifted ns */ | |
f726a697 JS |
127 | tk->xtime_interval = (u64) interval * clock->mult; |
128 | tk->xtime_remainder = ntpinterval - tk->xtime_interval; | |
129 | tk->raw_interval = | |
0a544198 | 130 | ((u64) interval * clock->mult) >> clock->shift; |
155ec602 | 131 | |
1e75fa8b JS |
132 | /* if changing clocks, convert xtime_nsec shift units */ |
133 | if (old_clock) { | |
134 | int shift_change = clock->shift - old_clock->shift; | |
135 | if (shift_change < 0) | |
f726a697 | 136 | tk->xtime_nsec >>= -shift_change; |
1e75fa8b | 137 | else |
f726a697 | 138 | tk->xtime_nsec <<= shift_change; |
1e75fa8b | 139 | } |
f726a697 | 140 | tk->shift = clock->shift; |
155ec602 | 141 | |
f726a697 JS |
142 | tk->ntp_error = 0; |
143 | tk->ntp_error_shift = NTP_SCALE_SHIFT - clock->shift; | |
0a544198 MS |
144 | |
145 | /* | |
146 | * The timekeeper keeps its own mult values for the currently | |
147 | * active clocksource. These value will be adjusted via NTP | |
148 | * to counteract clock drifting. | |
149 | */ | |
f726a697 | 150 | tk->mult = clock->mult; |
155ec602 | 151 | } |
8524070b | 152 | |
2ba2a305 | 153 | /* Timekeeper helper functions. */ |
7b1f6207 SW |
154 | |
155 | #ifdef CONFIG_ARCH_USES_GETTIMEOFFSET | |
156 | u32 (*arch_gettimeoffset)(void); | |
157 | ||
158 | u32 get_arch_timeoffset(void) | |
159 | { | |
160 | if (likely(arch_gettimeoffset)) | |
161 | return arch_gettimeoffset(); | |
162 | return 0; | |
163 | } | |
164 | #else | |
165 | static inline u32 get_arch_timeoffset(void) { return 0; } | |
166 | #endif | |
167 | ||
f726a697 | 168 | static inline s64 timekeeping_get_ns(struct timekeeper *tk) |
2ba2a305 MS |
169 | { |
170 | cycle_t cycle_now, cycle_delta; | |
171 | struct clocksource *clock; | |
1e75fa8b | 172 | s64 nsec; |
2ba2a305 MS |
173 | |
174 | /* read clocksource: */ | |
f726a697 | 175 | clock = tk->clock; |
2ba2a305 MS |
176 | cycle_now = clock->read(clock); |
177 | ||
178 | /* calculate the delta since the last update_wall_time: */ | |
179 | cycle_delta = (cycle_now - clock->cycle_last) & clock->mask; | |
180 | ||
f726a697 JS |
181 | nsec = cycle_delta * tk->mult + tk->xtime_nsec; |
182 | nsec >>= tk->shift; | |
f2a5a085 | 183 | |
7b1f6207 SW |
184 | /* If arch requires, add in get_arch_timeoffset() */ |
185 | return nsec + get_arch_timeoffset(); | |
2ba2a305 MS |
186 | } |
187 | ||
f726a697 | 188 | static inline s64 timekeeping_get_ns_raw(struct timekeeper *tk) |
2ba2a305 MS |
189 | { |
190 | cycle_t cycle_now, cycle_delta; | |
191 | struct clocksource *clock; | |
f2a5a085 | 192 | s64 nsec; |
2ba2a305 MS |
193 | |
194 | /* read clocksource: */ | |
f726a697 | 195 | clock = tk->clock; |
2ba2a305 MS |
196 | cycle_now = clock->read(clock); |
197 | ||
198 | /* calculate the delta since the last update_wall_time: */ | |
199 | cycle_delta = (cycle_now - clock->cycle_last) & clock->mask; | |
200 | ||
f2a5a085 JS |
201 | /* convert delta to nanoseconds. */ |
202 | nsec = clocksource_cyc2ns(cycle_delta, clock->mult, clock->shift); | |
203 | ||
7b1f6207 SW |
204 | /* If arch requires, add in get_arch_timeoffset() */ |
205 | return nsec + get_arch_timeoffset(); | |
2ba2a305 MS |
206 | } |
207 | ||
e0b306fe MT |
208 | static RAW_NOTIFIER_HEAD(pvclock_gtod_chain); |
209 | ||
780427f0 | 210 | static void update_pvclock_gtod(struct timekeeper *tk, bool was_set) |
e0b306fe | 211 | { |
780427f0 | 212 | raw_notifier_call_chain(&pvclock_gtod_chain, was_set, tk); |
e0b306fe MT |
213 | } |
214 | ||
215 | /** | |
216 | * pvclock_gtod_register_notifier - register a pvclock timedata update listener | |
e0b306fe MT |
217 | */ |
218 | int pvclock_gtod_register_notifier(struct notifier_block *nb) | |
219 | { | |
220 | struct timekeeper *tk = &timekeeper; | |
221 | unsigned long flags; | |
222 | int ret; | |
223 | ||
9a7a71b1 | 224 | raw_spin_lock_irqsave(&timekeeper_lock, flags); |
e0b306fe | 225 | ret = raw_notifier_chain_register(&pvclock_gtod_chain, nb); |
780427f0 | 226 | update_pvclock_gtod(tk, true); |
9a7a71b1 | 227 | raw_spin_unlock_irqrestore(&timekeeper_lock, flags); |
e0b306fe MT |
228 | |
229 | return ret; | |
230 | } | |
231 | EXPORT_SYMBOL_GPL(pvclock_gtod_register_notifier); | |
232 | ||
233 | /** | |
234 | * pvclock_gtod_unregister_notifier - unregister a pvclock | |
235 | * timedata update listener | |
e0b306fe MT |
236 | */ |
237 | int pvclock_gtod_unregister_notifier(struct notifier_block *nb) | |
238 | { | |
e0b306fe MT |
239 | unsigned long flags; |
240 | int ret; | |
241 | ||
9a7a71b1 | 242 | raw_spin_lock_irqsave(&timekeeper_lock, flags); |
e0b306fe | 243 | ret = raw_notifier_chain_unregister(&pvclock_gtod_chain, nb); |
9a7a71b1 | 244 | raw_spin_unlock_irqrestore(&timekeeper_lock, flags); |
e0b306fe MT |
245 | |
246 | return ret; | |
247 | } | |
248 | EXPORT_SYMBOL_GPL(pvclock_gtod_unregister_notifier); | |
249 | ||
9a7a71b1 | 250 | /* must hold timekeeper_lock */ |
04397fe9 | 251 | static void timekeeping_update(struct timekeeper *tk, unsigned int action) |
cc06268c | 252 | { |
04397fe9 | 253 | if (action & TK_CLEAR_NTP) { |
f726a697 | 254 | tk->ntp_error = 0; |
cc06268c TG |
255 | ntp_clear(); |
256 | } | |
576094b7 | 257 | update_vsyscall(tk); |
780427f0 | 258 | update_pvclock_gtod(tk, action & TK_CLOCK_WAS_SET); |
48cdc135 | 259 | |
04397fe9 | 260 | if (action & TK_MIRROR) |
48cdc135 | 261 | memcpy(&shadow_timekeeper, &timekeeper, sizeof(timekeeper)); |
cc06268c TG |
262 | } |
263 | ||
8524070b | 264 | /** |
155ec602 | 265 | * timekeeping_forward_now - update clock to the current time |
8524070b | 266 | * |
9a055117 RZ |
267 | * Forward the current clock to update its state since the last call to |
268 | * update_wall_time(). This is useful before significant clock changes, | |
269 | * as it avoids having to deal with this time offset explicitly. | |
8524070b | 270 | */ |
f726a697 | 271 | static void timekeeping_forward_now(struct timekeeper *tk) |
8524070b | 272 | { |
273 | cycle_t cycle_now, cycle_delta; | |
155ec602 | 274 | struct clocksource *clock; |
9a055117 | 275 | s64 nsec; |
8524070b | 276 | |
f726a697 | 277 | clock = tk->clock; |
a0f7d48b | 278 | cycle_now = clock->read(clock); |
8524070b | 279 | cycle_delta = (cycle_now - clock->cycle_last) & clock->mask; |
14a3b6ab | 280 | tk->cycle_last = clock->cycle_last = cycle_now; |
8524070b | 281 | |
f726a697 | 282 | tk->xtime_nsec += cycle_delta * tk->mult; |
7d27558c | 283 | |
7b1f6207 SW |
284 | /* If arch requires, add in get_arch_timeoffset() */ |
285 | tk->xtime_nsec += (u64)get_arch_timeoffset() << tk->shift; | |
7d27558c | 286 | |
f726a697 | 287 | tk_normalize_xtime(tk); |
2d42244a | 288 | |
0a544198 | 289 | nsec = clocksource_cyc2ns(cycle_delta, clock->mult, clock->shift); |
f726a697 | 290 | timespec_add_ns(&tk->raw_time, nsec); |
8524070b | 291 | } |
292 | ||
293 | /** | |
1e817fb6 | 294 | * __getnstimeofday - Returns the time of day in a timespec. |
8524070b | 295 | * @ts: pointer to the timespec to be set |
296 | * | |
1e817fb6 KC |
297 | * Updates the time of day in the timespec. |
298 | * Returns 0 on success, or -ve when suspended (timespec will be undefined). | |
8524070b | 299 | */ |
1e817fb6 | 300 | int __getnstimeofday(struct timespec *ts) |
8524070b | 301 | { |
4e250fdd | 302 | struct timekeeper *tk = &timekeeper; |
8524070b | 303 | unsigned long seq; |
1e75fa8b | 304 | s64 nsecs = 0; |
8524070b | 305 | |
306 | do { | |
9a7a71b1 | 307 | seq = read_seqcount_begin(&timekeeper_seq); |
8524070b | 308 | |
4e250fdd | 309 | ts->tv_sec = tk->xtime_sec; |
ec145bab | 310 | nsecs = timekeeping_get_ns(tk); |
8524070b | 311 | |
9a7a71b1 | 312 | } while (read_seqcount_retry(&timekeeper_seq, seq)); |
8524070b | 313 | |
ec145bab | 314 | ts->tv_nsec = 0; |
8524070b | 315 | timespec_add_ns(ts, nsecs); |
1e817fb6 KC |
316 | |
317 | /* | |
318 | * Do not bail out early, in case there were callers still using | |
319 | * the value, even in the face of the WARN_ON. | |
320 | */ | |
321 | if (unlikely(timekeeping_suspended)) | |
322 | return -EAGAIN; | |
323 | return 0; | |
324 | } | |
325 | EXPORT_SYMBOL(__getnstimeofday); | |
326 | ||
327 | /** | |
328 | * getnstimeofday - Returns the time of day in a timespec. | |
329 | * @ts: pointer to the timespec to be set | |
330 | * | |
331 | * Returns the time of day in a timespec (WARN if suspended). | |
332 | */ | |
333 | void getnstimeofday(struct timespec *ts) | |
334 | { | |
335 | WARN_ON(__getnstimeofday(ts)); | |
8524070b | 336 | } |
8524070b | 337 | EXPORT_SYMBOL(getnstimeofday); |
338 | ||
951ed4d3 MS |
339 | ktime_t ktime_get(void) |
340 | { | |
4e250fdd | 341 | struct timekeeper *tk = &timekeeper; |
951ed4d3 MS |
342 | unsigned int seq; |
343 | s64 secs, nsecs; | |
344 | ||
345 | WARN_ON(timekeeping_suspended); | |
346 | ||
347 | do { | |
9a7a71b1 | 348 | seq = read_seqcount_begin(&timekeeper_seq); |
4e250fdd JS |
349 | secs = tk->xtime_sec + tk->wall_to_monotonic.tv_sec; |
350 | nsecs = timekeeping_get_ns(tk) + tk->wall_to_monotonic.tv_nsec; | |
951ed4d3 | 351 | |
9a7a71b1 | 352 | } while (read_seqcount_retry(&timekeeper_seq, seq)); |
951ed4d3 MS |
353 | /* |
354 | * Use ktime_set/ktime_add_ns to create a proper ktime on | |
355 | * 32-bit architectures without CONFIG_KTIME_SCALAR. | |
356 | */ | |
357 | return ktime_add_ns(ktime_set(secs, 0), nsecs); | |
358 | } | |
359 | EXPORT_SYMBOL_GPL(ktime_get); | |
360 | ||
361 | /** | |
362 | * ktime_get_ts - get the monotonic clock in timespec format | |
363 | * @ts: pointer to timespec variable | |
364 | * | |
365 | * The function calculates the monotonic clock from the realtime | |
366 | * clock and the wall_to_monotonic offset and stores the result | |
367 | * in normalized timespec format in the variable pointed to by @ts. | |
368 | */ | |
369 | void ktime_get_ts(struct timespec *ts) | |
370 | { | |
4e250fdd | 371 | struct timekeeper *tk = &timekeeper; |
951ed4d3 | 372 | struct timespec tomono; |
ec145bab | 373 | s64 nsec; |
951ed4d3 | 374 | unsigned int seq; |
951ed4d3 MS |
375 | |
376 | WARN_ON(timekeeping_suspended); | |
377 | ||
378 | do { | |
9a7a71b1 | 379 | seq = read_seqcount_begin(&timekeeper_seq); |
4e250fdd | 380 | ts->tv_sec = tk->xtime_sec; |
ec145bab | 381 | nsec = timekeeping_get_ns(tk); |
4e250fdd | 382 | tomono = tk->wall_to_monotonic; |
951ed4d3 | 383 | |
9a7a71b1 | 384 | } while (read_seqcount_retry(&timekeeper_seq, seq)); |
951ed4d3 | 385 | |
ec145bab JS |
386 | ts->tv_sec += tomono.tv_sec; |
387 | ts->tv_nsec = 0; | |
388 | timespec_add_ns(ts, nsec + tomono.tv_nsec); | |
951ed4d3 MS |
389 | } |
390 | EXPORT_SYMBOL_GPL(ktime_get_ts); | |
391 | ||
1ff3c967 JS |
392 | |
393 | /** | |
394 | * timekeeping_clocktai - Returns the TAI time of day in a timespec | |
395 | * @ts: pointer to the timespec to be set | |
396 | * | |
397 | * Returns the time of day in a timespec. | |
398 | */ | |
399 | void timekeeping_clocktai(struct timespec *ts) | |
400 | { | |
401 | struct timekeeper *tk = &timekeeper; | |
402 | unsigned long seq; | |
403 | u64 nsecs; | |
404 | ||
405 | WARN_ON(timekeeping_suspended); | |
406 | ||
407 | do { | |
9a7a71b1 | 408 | seq = read_seqcount_begin(&timekeeper_seq); |
1ff3c967 JS |
409 | |
410 | ts->tv_sec = tk->xtime_sec + tk->tai_offset; | |
411 | nsecs = timekeeping_get_ns(tk); | |
412 | ||
9a7a71b1 | 413 | } while (read_seqcount_retry(&timekeeper_seq, seq)); |
1ff3c967 JS |
414 | |
415 | ts->tv_nsec = 0; | |
416 | timespec_add_ns(ts, nsecs); | |
417 | ||
418 | } | |
419 | EXPORT_SYMBOL(timekeeping_clocktai); | |
420 | ||
421 | ||
90adda98 JS |
422 | /** |
423 | * ktime_get_clocktai - Returns the TAI time of day in a ktime | |
424 | * | |
425 | * Returns the time of day in a ktime. | |
426 | */ | |
427 | ktime_t ktime_get_clocktai(void) | |
428 | { | |
429 | struct timespec ts; | |
430 | ||
431 | timekeeping_clocktai(&ts); | |
432 | return timespec_to_ktime(ts); | |
433 | } | |
434 | EXPORT_SYMBOL(ktime_get_clocktai); | |
435 | ||
e2c18e49 AG |
436 | #ifdef CONFIG_NTP_PPS |
437 | ||
438 | /** | |
439 | * getnstime_raw_and_real - get day and raw monotonic time in timespec format | |
440 | * @ts_raw: pointer to the timespec to be set to raw monotonic time | |
441 | * @ts_real: pointer to the timespec to be set to the time of day | |
442 | * | |
443 | * This function reads both the time of day and raw monotonic time at the | |
444 | * same time atomically and stores the resulting timestamps in timespec | |
445 | * format. | |
446 | */ | |
447 | void getnstime_raw_and_real(struct timespec *ts_raw, struct timespec *ts_real) | |
448 | { | |
4e250fdd | 449 | struct timekeeper *tk = &timekeeper; |
e2c18e49 AG |
450 | unsigned long seq; |
451 | s64 nsecs_raw, nsecs_real; | |
452 | ||
453 | WARN_ON_ONCE(timekeeping_suspended); | |
454 | ||
455 | do { | |
9a7a71b1 | 456 | seq = read_seqcount_begin(&timekeeper_seq); |
e2c18e49 | 457 | |
4e250fdd JS |
458 | *ts_raw = tk->raw_time; |
459 | ts_real->tv_sec = tk->xtime_sec; | |
1e75fa8b | 460 | ts_real->tv_nsec = 0; |
e2c18e49 | 461 | |
4e250fdd JS |
462 | nsecs_raw = timekeeping_get_ns_raw(tk); |
463 | nsecs_real = timekeeping_get_ns(tk); | |
e2c18e49 | 464 | |
9a7a71b1 | 465 | } while (read_seqcount_retry(&timekeeper_seq, seq)); |
e2c18e49 AG |
466 | |
467 | timespec_add_ns(ts_raw, nsecs_raw); | |
468 | timespec_add_ns(ts_real, nsecs_real); | |
469 | } | |
470 | EXPORT_SYMBOL(getnstime_raw_and_real); | |
471 | ||
472 | #endif /* CONFIG_NTP_PPS */ | |
473 | ||
8524070b | 474 | /** |
475 | * do_gettimeofday - Returns the time of day in a timeval | |
476 | * @tv: pointer to the timeval to be set | |
477 | * | |
efd9ac86 | 478 | * NOTE: Users should be converted to using getnstimeofday() |
8524070b | 479 | */ |
480 | void do_gettimeofday(struct timeval *tv) | |
481 | { | |
482 | struct timespec now; | |
483 | ||
efd9ac86 | 484 | getnstimeofday(&now); |
8524070b | 485 | tv->tv_sec = now.tv_sec; |
486 | tv->tv_usec = now.tv_nsec/1000; | |
487 | } | |
8524070b | 488 | EXPORT_SYMBOL(do_gettimeofday); |
d239f49d | 489 | |
8524070b | 490 | /** |
491 | * do_settimeofday - Sets the time of day | |
492 | * @tv: pointer to the timespec variable containing the new time | |
493 | * | |
494 | * Sets the time of day to the new time and update NTP and notify hrtimers | |
495 | */ | |
1e6d7679 | 496 | int do_settimeofday(const struct timespec *tv) |
8524070b | 497 | { |
4e250fdd | 498 | struct timekeeper *tk = &timekeeper; |
1e75fa8b | 499 | struct timespec ts_delta, xt; |
92c1d3ed | 500 | unsigned long flags; |
8524070b | 501 | |
cee58483 | 502 | if (!timespec_valid_strict(tv)) |
8524070b | 503 | return -EINVAL; |
504 | ||
9a7a71b1 TG |
505 | raw_spin_lock_irqsave(&timekeeper_lock, flags); |
506 | write_seqcount_begin(&timekeeper_seq); | |
8524070b | 507 | |
4e250fdd | 508 | timekeeping_forward_now(tk); |
9a055117 | 509 | |
4e250fdd | 510 | xt = tk_xtime(tk); |
1e75fa8b JS |
511 | ts_delta.tv_sec = tv->tv_sec - xt.tv_sec; |
512 | ts_delta.tv_nsec = tv->tv_nsec - xt.tv_nsec; | |
513 | ||
4e250fdd | 514 | tk_set_wall_to_mono(tk, timespec_sub(tk->wall_to_monotonic, ts_delta)); |
8524070b | 515 | |
4e250fdd | 516 | tk_set_xtime(tk, tv); |
1e75fa8b | 517 | |
780427f0 | 518 | timekeeping_update(tk, TK_CLEAR_NTP | TK_MIRROR | TK_CLOCK_WAS_SET); |
8524070b | 519 | |
9a7a71b1 TG |
520 | write_seqcount_end(&timekeeper_seq); |
521 | raw_spin_unlock_irqrestore(&timekeeper_lock, flags); | |
8524070b | 522 | |
523 | /* signal hrtimers about time change */ | |
524 | clock_was_set(); | |
525 | ||
526 | return 0; | |
527 | } | |
8524070b | 528 | EXPORT_SYMBOL(do_settimeofday); |
529 | ||
c528f7c6 JS |
530 | /** |
531 | * timekeeping_inject_offset - Adds or subtracts from the current time. | |
532 | * @tv: pointer to the timespec variable containing the offset | |
533 | * | |
534 | * Adds or subtracts an offset value from the current time. | |
535 | */ | |
536 | int timekeeping_inject_offset(struct timespec *ts) | |
537 | { | |
4e250fdd | 538 | struct timekeeper *tk = &timekeeper; |
92c1d3ed | 539 | unsigned long flags; |
4e8b1452 JS |
540 | struct timespec tmp; |
541 | int ret = 0; | |
c528f7c6 JS |
542 | |
543 | if ((unsigned long)ts->tv_nsec >= NSEC_PER_SEC) | |
544 | return -EINVAL; | |
545 | ||
9a7a71b1 TG |
546 | raw_spin_lock_irqsave(&timekeeper_lock, flags); |
547 | write_seqcount_begin(&timekeeper_seq); | |
c528f7c6 | 548 | |
4e250fdd | 549 | timekeeping_forward_now(tk); |
c528f7c6 | 550 | |
4e8b1452 JS |
551 | /* Make sure the proposed value is valid */ |
552 | tmp = timespec_add(tk_xtime(tk), *ts); | |
cee58483 | 553 | if (!timespec_valid_strict(&tmp)) { |
4e8b1452 JS |
554 | ret = -EINVAL; |
555 | goto error; | |
556 | } | |
1e75fa8b | 557 | |
4e250fdd JS |
558 | tk_xtime_add(tk, ts); |
559 | tk_set_wall_to_mono(tk, timespec_sub(tk->wall_to_monotonic, *ts)); | |
c528f7c6 | 560 | |
4e8b1452 | 561 | error: /* even if we error out, we forwarded the time, so call update */ |
780427f0 | 562 | timekeeping_update(tk, TK_CLEAR_NTP | TK_MIRROR | TK_CLOCK_WAS_SET); |
c528f7c6 | 563 | |
9a7a71b1 TG |
564 | write_seqcount_end(&timekeeper_seq); |
565 | raw_spin_unlock_irqrestore(&timekeeper_lock, flags); | |
c528f7c6 JS |
566 | |
567 | /* signal hrtimers about time change */ | |
568 | clock_was_set(); | |
569 | ||
4e8b1452 | 570 | return ret; |
c528f7c6 JS |
571 | } |
572 | EXPORT_SYMBOL(timekeeping_inject_offset); | |
573 | ||
cc244dda JS |
574 | |
575 | /** | |
576 | * timekeeping_get_tai_offset - Returns current TAI offset from UTC | |
577 | * | |
578 | */ | |
579 | s32 timekeeping_get_tai_offset(void) | |
580 | { | |
581 | struct timekeeper *tk = &timekeeper; | |
582 | unsigned int seq; | |
583 | s32 ret; | |
584 | ||
585 | do { | |
9a7a71b1 | 586 | seq = read_seqcount_begin(&timekeeper_seq); |
cc244dda | 587 | ret = tk->tai_offset; |
9a7a71b1 | 588 | } while (read_seqcount_retry(&timekeeper_seq, seq)); |
cc244dda JS |
589 | |
590 | return ret; | |
591 | } | |
592 | ||
593 | /** | |
594 | * __timekeeping_set_tai_offset - Lock free worker function | |
595 | * | |
596 | */ | |
dd5d70e8 | 597 | static void __timekeeping_set_tai_offset(struct timekeeper *tk, s32 tai_offset) |
cc244dda JS |
598 | { |
599 | tk->tai_offset = tai_offset; | |
04005f60 | 600 | tk->offs_tai = ktime_add(tk->offs_real, ktime_set(tai_offset, 0)); |
cc244dda JS |
601 | } |
602 | ||
603 | /** | |
604 | * timekeeping_set_tai_offset - Sets the current TAI offset from UTC | |
605 | * | |
606 | */ | |
607 | void timekeeping_set_tai_offset(s32 tai_offset) | |
608 | { | |
609 | struct timekeeper *tk = &timekeeper; | |
610 | unsigned long flags; | |
611 | ||
9a7a71b1 TG |
612 | raw_spin_lock_irqsave(&timekeeper_lock, flags); |
613 | write_seqcount_begin(&timekeeper_seq); | |
cc244dda | 614 | __timekeeping_set_tai_offset(tk, tai_offset); |
f55c0760 | 615 | timekeeping_update(tk, TK_MIRROR | TK_CLOCK_WAS_SET); |
9a7a71b1 TG |
616 | write_seqcount_end(&timekeeper_seq); |
617 | raw_spin_unlock_irqrestore(&timekeeper_lock, flags); | |
4e8f8b34 | 618 | clock_was_set(); |
cc244dda JS |
619 | } |
620 | ||
8524070b | 621 | /** |
622 | * change_clocksource - Swaps clocksources if a new one is available | |
623 | * | |
624 | * Accumulates current time interval and initializes new clocksource | |
625 | */ | |
75c5158f | 626 | static int change_clocksource(void *data) |
8524070b | 627 | { |
4e250fdd | 628 | struct timekeeper *tk = &timekeeper; |
4614e6ad | 629 | struct clocksource *new, *old; |
f695cf94 | 630 | unsigned long flags; |
8524070b | 631 | |
75c5158f | 632 | new = (struct clocksource *) data; |
8524070b | 633 | |
9a7a71b1 TG |
634 | raw_spin_lock_irqsave(&timekeeper_lock, flags); |
635 | write_seqcount_begin(&timekeeper_seq); | |
f695cf94 | 636 | |
4e250fdd | 637 | timekeeping_forward_now(tk); |
09ac369c TG |
638 | /* |
639 | * If the cs is in module, get a module reference. Succeeds | |
640 | * for built-in code (owner == NULL) as well. | |
641 | */ | |
642 | if (try_module_get(new->owner)) { | |
643 | if (!new->enable || new->enable(new) == 0) { | |
644 | old = tk->clock; | |
645 | tk_setup_internals(tk, new); | |
646 | if (old->disable) | |
647 | old->disable(old); | |
648 | module_put(old->owner); | |
649 | } else { | |
650 | module_put(new->owner); | |
651 | } | |
75c5158f | 652 | } |
780427f0 | 653 | timekeeping_update(tk, TK_CLEAR_NTP | TK_MIRROR | TK_CLOCK_WAS_SET); |
f695cf94 | 654 | |
9a7a71b1 TG |
655 | write_seqcount_end(&timekeeper_seq); |
656 | raw_spin_unlock_irqrestore(&timekeeper_lock, flags); | |
f695cf94 | 657 | |
75c5158f MS |
658 | return 0; |
659 | } | |
8524070b | 660 | |
75c5158f MS |
661 | /** |
662 | * timekeeping_notify - Install a new clock source | |
663 | * @clock: pointer to the clock source | |
664 | * | |
665 | * This function is called from clocksource.c after a new, better clock | |
666 | * source has been registered. The caller holds the clocksource_mutex. | |
667 | */ | |
ba919d1c | 668 | int timekeeping_notify(struct clocksource *clock) |
75c5158f | 669 | { |
4e250fdd JS |
670 | struct timekeeper *tk = &timekeeper; |
671 | ||
672 | if (tk->clock == clock) | |
ba919d1c | 673 | return 0; |
75c5158f | 674 | stop_machine(change_clocksource, clock, NULL); |
8524070b | 675 | tick_clock_notify(); |
ba919d1c | 676 | return tk->clock == clock ? 0 : -1; |
8524070b | 677 | } |
75c5158f | 678 | |
a40f262c TG |
679 | /** |
680 | * ktime_get_real - get the real (wall-) time in ktime_t format | |
681 | * | |
682 | * returns the time in ktime_t format | |
683 | */ | |
684 | ktime_t ktime_get_real(void) | |
685 | { | |
686 | struct timespec now; | |
687 | ||
688 | getnstimeofday(&now); | |
689 | ||
690 | return timespec_to_ktime(now); | |
691 | } | |
692 | EXPORT_SYMBOL_GPL(ktime_get_real); | |
8524070b | 693 | |
2d42244a JS |
694 | /** |
695 | * getrawmonotonic - Returns the raw monotonic time in a timespec | |
696 | * @ts: pointer to the timespec to be set | |
697 | * | |
698 | * Returns the raw monotonic time (completely un-modified by ntp) | |
699 | */ | |
700 | void getrawmonotonic(struct timespec *ts) | |
701 | { | |
4e250fdd | 702 | struct timekeeper *tk = &timekeeper; |
2d42244a JS |
703 | unsigned long seq; |
704 | s64 nsecs; | |
2d42244a JS |
705 | |
706 | do { | |
9a7a71b1 | 707 | seq = read_seqcount_begin(&timekeeper_seq); |
4e250fdd JS |
708 | nsecs = timekeeping_get_ns_raw(tk); |
709 | *ts = tk->raw_time; | |
2d42244a | 710 | |
9a7a71b1 | 711 | } while (read_seqcount_retry(&timekeeper_seq, seq)); |
2d42244a JS |
712 | |
713 | timespec_add_ns(ts, nsecs); | |
714 | } | |
715 | EXPORT_SYMBOL(getrawmonotonic); | |
716 | ||
8524070b | 717 | /** |
cf4fc6cb | 718 | * timekeeping_valid_for_hres - Check if timekeeping is suitable for hres |
8524070b | 719 | */ |
cf4fc6cb | 720 | int timekeeping_valid_for_hres(void) |
8524070b | 721 | { |
4e250fdd | 722 | struct timekeeper *tk = &timekeeper; |
8524070b | 723 | unsigned long seq; |
724 | int ret; | |
725 | ||
726 | do { | |
9a7a71b1 | 727 | seq = read_seqcount_begin(&timekeeper_seq); |
8524070b | 728 | |
4e250fdd | 729 | ret = tk->clock->flags & CLOCK_SOURCE_VALID_FOR_HRES; |
8524070b | 730 | |
9a7a71b1 | 731 | } while (read_seqcount_retry(&timekeeper_seq, seq)); |
8524070b | 732 | |
733 | return ret; | |
734 | } | |
735 | ||
98962465 JH |
736 | /** |
737 | * timekeeping_max_deferment - Returns max time the clocksource can be deferred | |
98962465 JH |
738 | */ |
739 | u64 timekeeping_max_deferment(void) | |
740 | { | |
4e250fdd | 741 | struct timekeeper *tk = &timekeeper; |
70471f2f JS |
742 | unsigned long seq; |
743 | u64 ret; | |
42e71e81 | 744 | |
70471f2f | 745 | do { |
9a7a71b1 | 746 | seq = read_seqcount_begin(&timekeeper_seq); |
70471f2f | 747 | |
4e250fdd | 748 | ret = tk->clock->max_idle_ns; |
70471f2f | 749 | |
9a7a71b1 | 750 | } while (read_seqcount_retry(&timekeeper_seq, seq)); |
70471f2f JS |
751 | |
752 | return ret; | |
98962465 JH |
753 | } |
754 | ||
8524070b | 755 | /** |
d4f587c6 | 756 | * read_persistent_clock - Return time from the persistent clock. |
8524070b | 757 | * |
758 | * Weak dummy function for arches that do not yet support it. | |
d4f587c6 MS |
759 | * Reads the time from the battery backed persistent clock. |
760 | * Returns a timespec with tv_sec=0 and tv_nsec=0 if unsupported. | |
8524070b | 761 | * |
762 | * XXX - Do be sure to remove it once all arches implement it. | |
763 | */ | |
52f5684c | 764 | void __weak read_persistent_clock(struct timespec *ts) |
8524070b | 765 | { |
d4f587c6 MS |
766 | ts->tv_sec = 0; |
767 | ts->tv_nsec = 0; | |
8524070b | 768 | } |
769 | ||
23970e38 MS |
770 | /** |
771 | * read_boot_clock - Return time of the system start. | |
772 | * | |
773 | * Weak dummy function for arches that do not yet support it. | |
774 | * Function to read the exact time the system has been started. | |
775 | * Returns a timespec with tv_sec=0 and tv_nsec=0 if unsupported. | |
776 | * | |
777 | * XXX - Do be sure to remove it once all arches implement it. | |
778 | */ | |
52f5684c | 779 | void __weak read_boot_clock(struct timespec *ts) |
23970e38 MS |
780 | { |
781 | ts->tv_sec = 0; | |
782 | ts->tv_nsec = 0; | |
783 | } | |
784 | ||
8524070b | 785 | /* |
786 | * timekeeping_init - Initializes the clocksource and common timekeeping values | |
787 | */ | |
788 | void __init timekeeping_init(void) | |
789 | { | |
4e250fdd | 790 | struct timekeeper *tk = &timekeeper; |
155ec602 | 791 | struct clocksource *clock; |
8524070b | 792 | unsigned long flags; |
6d0ef903 | 793 | struct timespec now, boot, tmp; |
d4f587c6 MS |
794 | |
795 | read_persistent_clock(&now); | |
31ade306 | 796 | |
cee58483 | 797 | if (!timespec_valid_strict(&now)) { |
4e8b1452 JS |
798 | pr_warn("WARNING: Persistent clock returned invalid value!\n" |
799 | " Check your CMOS/BIOS settings.\n"); | |
800 | now.tv_sec = 0; | |
801 | now.tv_nsec = 0; | |
31ade306 FT |
802 | } else if (now.tv_sec || now.tv_nsec) |
803 | persistent_clock_exist = true; | |
4e8b1452 | 804 | |
23970e38 | 805 | read_boot_clock(&boot); |
cee58483 | 806 | if (!timespec_valid_strict(&boot)) { |
4e8b1452 JS |
807 | pr_warn("WARNING: Boot clock returned invalid value!\n" |
808 | " Check your CMOS/BIOS settings.\n"); | |
809 | boot.tv_sec = 0; | |
810 | boot.tv_nsec = 0; | |
811 | } | |
8524070b | 812 | |
9a7a71b1 TG |
813 | raw_spin_lock_irqsave(&timekeeper_lock, flags); |
814 | write_seqcount_begin(&timekeeper_seq); | |
06c017fd JS |
815 | ntp_init(); |
816 | ||
f1b82746 | 817 | clock = clocksource_default_clock(); |
a0f7d48b MS |
818 | if (clock->enable) |
819 | clock->enable(clock); | |
4e250fdd | 820 | tk_setup_internals(tk, clock); |
8524070b | 821 | |
4e250fdd JS |
822 | tk_set_xtime(tk, &now); |
823 | tk->raw_time.tv_sec = 0; | |
824 | tk->raw_time.tv_nsec = 0; | |
1e75fa8b | 825 | if (boot.tv_sec == 0 && boot.tv_nsec == 0) |
4e250fdd | 826 | boot = tk_xtime(tk); |
1e75fa8b | 827 | |
6d0ef903 | 828 | set_normalized_timespec(&tmp, -boot.tv_sec, -boot.tv_nsec); |
4e250fdd | 829 | tk_set_wall_to_mono(tk, tmp); |
6d0ef903 JS |
830 | |
831 | tmp.tv_sec = 0; | |
832 | tmp.tv_nsec = 0; | |
4e250fdd | 833 | tk_set_sleep_time(tk, tmp); |
6d0ef903 | 834 | |
48cdc135 TG |
835 | memcpy(&shadow_timekeeper, &timekeeper, sizeof(timekeeper)); |
836 | ||
9a7a71b1 TG |
837 | write_seqcount_end(&timekeeper_seq); |
838 | raw_spin_unlock_irqrestore(&timekeeper_lock, flags); | |
8524070b | 839 | } |
840 | ||
8524070b | 841 | /* time in seconds when suspend began */ |
d4f587c6 | 842 | static struct timespec timekeeping_suspend_time; |
8524070b | 843 | |
304529b1 JS |
844 | /** |
845 | * __timekeeping_inject_sleeptime - Internal function to add sleep interval | |
846 | * @delta: pointer to a timespec delta value | |
847 | * | |
848 | * Takes a timespec offset measuring a suspend interval and properly | |
849 | * adds the sleep offset to the timekeeping variables. | |
850 | */ | |
f726a697 JS |
851 | static void __timekeeping_inject_sleeptime(struct timekeeper *tk, |
852 | struct timespec *delta) | |
304529b1 | 853 | { |
cee58483 | 854 | if (!timespec_valid_strict(delta)) { |
6d9bcb62 JS |
855 | printk_deferred(KERN_WARNING |
856 | "__timekeeping_inject_sleeptime: Invalid " | |
857 | "sleep delta value!\n"); | |
cb5de2f8 JS |
858 | return; |
859 | } | |
f726a697 | 860 | tk_xtime_add(tk, delta); |
6d0ef903 JS |
861 | tk_set_wall_to_mono(tk, timespec_sub(tk->wall_to_monotonic, *delta)); |
862 | tk_set_sleep_time(tk, timespec_add(tk->total_sleep_time, *delta)); | |
5c83545f | 863 | tk_debug_account_sleep_time(delta); |
304529b1 JS |
864 | } |
865 | ||
304529b1 JS |
866 | /** |
867 | * timekeeping_inject_sleeptime - Adds suspend interval to timeekeeping values | |
868 | * @delta: pointer to a timespec delta value | |
869 | * | |
870 | * This hook is for architectures that cannot support read_persistent_clock | |
871 | * because their RTC/persistent clock is only accessible when irqs are enabled. | |
872 | * | |
873 | * This function should only be called by rtc_resume(), and allows | |
874 | * a suspend offset to be injected into the timekeeping values. | |
875 | */ | |
876 | void timekeeping_inject_sleeptime(struct timespec *delta) | |
877 | { | |
4e250fdd | 878 | struct timekeeper *tk = &timekeeper; |
92c1d3ed | 879 | unsigned long flags; |
304529b1 | 880 | |
31ade306 FT |
881 | /* |
882 | * Make sure we don't set the clock twice, as timekeeping_resume() | |
883 | * already did it | |
884 | */ | |
885 | if (has_persistent_clock()) | |
304529b1 JS |
886 | return; |
887 | ||
9a7a71b1 TG |
888 | raw_spin_lock_irqsave(&timekeeper_lock, flags); |
889 | write_seqcount_begin(&timekeeper_seq); | |
70471f2f | 890 | |
4e250fdd | 891 | timekeeping_forward_now(tk); |
304529b1 | 892 | |
4e250fdd | 893 | __timekeeping_inject_sleeptime(tk, delta); |
304529b1 | 894 | |
780427f0 | 895 | timekeeping_update(tk, TK_CLEAR_NTP | TK_MIRROR | TK_CLOCK_WAS_SET); |
304529b1 | 896 | |
9a7a71b1 TG |
897 | write_seqcount_end(&timekeeper_seq); |
898 | raw_spin_unlock_irqrestore(&timekeeper_lock, flags); | |
304529b1 JS |
899 | |
900 | /* signal hrtimers about time change */ | |
901 | clock_was_set(); | |
902 | } | |
903 | ||
8524070b | 904 | /** |
905 | * timekeeping_resume - Resumes the generic timekeeping subsystem. | |
8524070b | 906 | * |
907 | * This is for the generic clocksource timekeeping. | |
908 | * xtime/wall_to_monotonic/jiffies/etc are | |
909 | * still managed by arch specific suspend/resume code. | |
910 | */ | |
e1a85b2c | 911 | static void timekeeping_resume(void) |
8524070b | 912 | { |
4e250fdd | 913 | struct timekeeper *tk = &timekeeper; |
e445cf1c | 914 | struct clocksource *clock = tk->clock; |
92c1d3ed | 915 | unsigned long flags; |
e445cf1c FT |
916 | struct timespec ts_new, ts_delta; |
917 | cycle_t cycle_now, cycle_delta; | |
918 | bool suspendtime_found = false; | |
d4f587c6 | 919 | |
e445cf1c | 920 | read_persistent_clock(&ts_new); |
8524070b | 921 | |
adc78e6b | 922 | clockevents_resume(); |
d10ff3fb TG |
923 | clocksource_resume(); |
924 | ||
9a7a71b1 TG |
925 | raw_spin_lock_irqsave(&timekeeper_lock, flags); |
926 | write_seqcount_begin(&timekeeper_seq); | |
8524070b | 927 | |
e445cf1c FT |
928 | /* |
929 | * After system resumes, we need to calculate the suspended time and | |
930 | * compensate it for the OS time. There are 3 sources that could be | |
931 | * used: Nonstop clocksource during suspend, persistent clock and rtc | |
932 | * device. | |
933 | * | |
934 | * One specific platform may have 1 or 2 or all of them, and the | |
935 | * preference will be: | |
936 | * suspend-nonstop clocksource -> persistent clock -> rtc | |
937 | * The less preferred source will only be tried if there is no better | |
938 | * usable source. The rtc part is handled separately in rtc core code. | |
939 | */ | |
940 | cycle_now = clock->read(clock); | |
941 | if ((clock->flags & CLOCK_SOURCE_SUSPEND_NONSTOP) && | |
942 | cycle_now > clock->cycle_last) { | |
943 | u64 num, max = ULLONG_MAX; | |
944 | u32 mult = clock->mult; | |
945 | u32 shift = clock->shift; | |
946 | s64 nsec = 0; | |
947 | ||
948 | cycle_delta = (cycle_now - clock->cycle_last) & clock->mask; | |
949 | ||
950 | /* | |
951 | * "cycle_delta * mutl" may cause 64 bits overflow, if the | |
952 | * suspended time is too long. In that case we need do the | |
953 | * 64 bits math carefully | |
954 | */ | |
955 | do_div(max, mult); | |
956 | if (cycle_delta > max) { | |
957 | num = div64_u64(cycle_delta, max); | |
958 | nsec = (((u64) max * mult) >> shift) * num; | |
959 | cycle_delta -= num * max; | |
960 | } | |
961 | nsec += ((u64) cycle_delta * mult) >> shift; | |
962 | ||
963 | ts_delta = ns_to_timespec(nsec); | |
964 | suspendtime_found = true; | |
965 | } else if (timespec_compare(&ts_new, &timekeeping_suspend_time) > 0) { | |
966 | ts_delta = timespec_sub(ts_new, timekeeping_suspend_time); | |
967 | suspendtime_found = true; | |
8524070b | 968 | } |
e445cf1c FT |
969 | |
970 | if (suspendtime_found) | |
971 | __timekeeping_inject_sleeptime(tk, &ts_delta); | |
972 | ||
973 | /* Re-base the last cycle value */ | |
77c675ba | 974 | tk->cycle_last = clock->cycle_last = cycle_now; |
4e250fdd | 975 | tk->ntp_error = 0; |
8524070b | 976 | timekeeping_suspended = 0; |
780427f0 | 977 | timekeeping_update(tk, TK_MIRROR | TK_CLOCK_WAS_SET); |
9a7a71b1 TG |
978 | write_seqcount_end(&timekeeper_seq); |
979 | raw_spin_unlock_irqrestore(&timekeeper_lock, flags); | |
8524070b | 980 | |
981 | touch_softlockup_watchdog(); | |
982 | ||
983 | clockevents_notify(CLOCK_EVT_NOTIFY_RESUME, NULL); | |
984 | ||
985 | /* Resume hrtimers */ | |
b12a03ce | 986 | hrtimers_resume(); |
8524070b | 987 | } |
988 | ||
e1a85b2c | 989 | static int timekeeping_suspend(void) |
8524070b | 990 | { |
4e250fdd | 991 | struct timekeeper *tk = &timekeeper; |
92c1d3ed | 992 | unsigned long flags; |
cb33217b JS |
993 | struct timespec delta, delta_delta; |
994 | static struct timespec old_delta; | |
8524070b | 995 | |
d4f587c6 | 996 | read_persistent_clock(&timekeeping_suspend_time); |
3be90950 | 997 | |
0d6bd995 ZM |
998 | /* |
999 | * On some systems the persistent_clock can not be detected at | |
1000 | * timekeeping_init by its return value, so if we see a valid | |
1001 | * value returned, update the persistent_clock_exists flag. | |
1002 | */ | |
1003 | if (timekeeping_suspend_time.tv_sec || timekeeping_suspend_time.tv_nsec) | |
1004 | persistent_clock_exist = true; | |
1005 | ||
9a7a71b1 TG |
1006 | raw_spin_lock_irqsave(&timekeeper_lock, flags); |
1007 | write_seqcount_begin(&timekeeper_seq); | |
4e250fdd | 1008 | timekeeping_forward_now(tk); |
8524070b | 1009 | timekeeping_suspended = 1; |
cb33217b JS |
1010 | |
1011 | /* | |
1012 | * To avoid drift caused by repeated suspend/resumes, | |
1013 | * which each can add ~1 second drift error, | |
1014 | * try to compensate so the difference in system time | |
1015 | * and persistent_clock time stays close to constant. | |
1016 | */ | |
4e250fdd | 1017 | delta = timespec_sub(tk_xtime(tk), timekeeping_suspend_time); |
cb33217b JS |
1018 | delta_delta = timespec_sub(delta, old_delta); |
1019 | if (abs(delta_delta.tv_sec) >= 2) { | |
1020 | /* | |
1021 | * if delta_delta is too large, assume time correction | |
1022 | * has occured and set old_delta to the current delta. | |
1023 | */ | |
1024 | old_delta = delta; | |
1025 | } else { | |
1026 | /* Otherwise try to adjust old_system to compensate */ | |
1027 | timekeeping_suspend_time = | |
1028 | timespec_add(timekeeping_suspend_time, delta_delta); | |
1029 | } | |
330a1617 JS |
1030 | |
1031 | timekeeping_update(tk, TK_MIRROR); | |
9a7a71b1 TG |
1032 | write_seqcount_end(&timekeeper_seq); |
1033 | raw_spin_unlock_irqrestore(&timekeeper_lock, flags); | |
8524070b | 1034 | |
1035 | clockevents_notify(CLOCK_EVT_NOTIFY_SUSPEND, NULL); | |
c54a42b1 | 1036 | clocksource_suspend(); |
adc78e6b | 1037 | clockevents_suspend(); |
8524070b | 1038 | |
1039 | return 0; | |
1040 | } | |
1041 | ||
1042 | /* sysfs resume/suspend bits for timekeeping */ | |
e1a85b2c | 1043 | static struct syscore_ops timekeeping_syscore_ops = { |
8524070b | 1044 | .resume = timekeeping_resume, |
1045 | .suspend = timekeeping_suspend, | |
8524070b | 1046 | }; |
1047 | ||
e1a85b2c | 1048 | static int __init timekeeping_init_ops(void) |
8524070b | 1049 | { |
e1a85b2c RW |
1050 | register_syscore_ops(&timekeeping_syscore_ops); |
1051 | return 0; | |
8524070b | 1052 | } |
1053 | ||
e1a85b2c | 1054 | device_initcall(timekeeping_init_ops); |
8524070b | 1055 | |
1056 | /* | |
1057 | * If the error is already larger, we look ahead even further | |
1058 | * to compensate for late or lost adjustments. | |
1059 | */ | |
f726a697 JS |
1060 | static __always_inline int timekeeping_bigadjust(struct timekeeper *tk, |
1061 | s64 error, s64 *interval, | |
8524070b | 1062 | s64 *offset) |
1063 | { | |
1064 | s64 tick_error, i; | |
1065 | u32 look_ahead, adj; | |
1066 | s32 error2, mult; | |
1067 | ||
1068 | /* | |
1069 | * Use the current error value to determine how much to look ahead. | |
1070 | * The larger the error the slower we adjust for it to avoid problems | |
1071 | * with losing too many ticks, otherwise we would overadjust and | |
1072 | * produce an even larger error. The smaller the adjustment the | |
1073 | * faster we try to adjust for it, as lost ticks can do less harm | |
3eb05676 | 1074 | * here. This is tuned so that an error of about 1 msec is adjusted |
8524070b | 1075 | * within about 1 sec (or 2^20 nsec in 2^SHIFT_HZ ticks). |
1076 | */ | |
f726a697 | 1077 | error2 = tk->ntp_error >> (NTP_SCALE_SHIFT + 22 - 2 * SHIFT_HZ); |
8524070b | 1078 | error2 = abs(error2); |
1079 | for (look_ahead = 0; error2 > 0; look_ahead++) | |
1080 | error2 >>= 2; | |
1081 | ||
1082 | /* | |
1083 | * Now calculate the error in (1 << look_ahead) ticks, but first | |
1084 | * remove the single look ahead already included in the error. | |
1085 | */ | |
f726a697 JS |
1086 | tick_error = ntp_tick_length() >> (tk->ntp_error_shift + 1); |
1087 | tick_error -= tk->xtime_interval >> 1; | |
8524070b | 1088 | error = ((error - tick_error) >> look_ahead) + tick_error; |
1089 | ||
1090 | /* Finally calculate the adjustment shift value. */ | |
1091 | i = *interval; | |
1092 | mult = 1; | |
1093 | if (error < 0) { | |
1094 | error = -error; | |
1095 | *interval = -*interval; | |
1096 | *offset = -*offset; | |
1097 | mult = -1; | |
1098 | } | |
1099 | for (adj = 0; error > i; adj++) | |
1100 | error >>= 1; | |
1101 | ||
1102 | *interval <<= adj; | |
1103 | *offset <<= adj; | |
1104 | return mult << adj; | |
1105 | } | |
1106 | ||
1107 | /* | |
1108 | * Adjust the multiplier to reduce the error value, | |
1109 | * this is optimized for the most common adjustments of -1,0,1, | |
1110 | * for other values we can do a bit more work. | |
1111 | */ | |
f726a697 | 1112 | static void timekeeping_adjust(struct timekeeper *tk, s64 offset) |
8524070b | 1113 | { |
f726a697 | 1114 | s64 error, interval = tk->cycle_interval; |
8524070b | 1115 | int adj; |
1116 | ||
c2bc1111 | 1117 | /* |
88b28adf | 1118 | * The point of this is to check if the error is greater than half |
c2bc1111 JS |
1119 | * an interval. |
1120 | * | |
1121 | * First we shift it down from NTP_SHIFT to clocksource->shifted nsecs. | |
1122 | * | |
1123 | * Note we subtract one in the shift, so that error is really error*2. | |
3f86f28f JS |
1124 | * This "saves" dividing(shifting) interval twice, but keeps the |
1125 | * (error > interval) comparison as still measuring if error is | |
88b28adf | 1126 | * larger than half an interval. |
c2bc1111 | 1127 | * |
3f86f28f | 1128 | * Note: It does not "save" on aggravation when reading the code. |
c2bc1111 | 1129 | */ |
f726a697 | 1130 | error = tk->ntp_error >> (tk->ntp_error_shift - 1); |
8524070b | 1131 | if (error > interval) { |
c2bc1111 JS |
1132 | /* |
1133 | * We now divide error by 4(via shift), which checks if | |
88b28adf | 1134 | * the error is greater than twice the interval. |
c2bc1111 JS |
1135 | * If it is greater, we need a bigadjust, if its smaller, |
1136 | * we can adjust by 1. | |
1137 | */ | |
8524070b | 1138 | error >>= 2; |
1139 | if (likely(error <= interval)) | |
1140 | adj = 1; | |
1141 | else | |
1d17d174 IM |
1142 | adj = timekeeping_bigadjust(tk, error, &interval, &offset); |
1143 | } else { | |
1144 | if (error < -interval) { | |
1145 | /* See comment above, this is just switched for the negative */ | |
1146 | error >>= 2; | |
1147 | if (likely(error >= -interval)) { | |
1148 | adj = -1; | |
1149 | interval = -interval; | |
1150 | offset = -offset; | |
1151 | } else { | |
1152 | adj = timekeeping_bigadjust(tk, error, &interval, &offset); | |
1153 | } | |
1154 | } else { | |
1155 | goto out_adjust; | |
1156 | } | |
1157 | } | |
8524070b | 1158 | |
f726a697 JS |
1159 | if (unlikely(tk->clock->maxadj && |
1160 | (tk->mult + adj > tk->clock->mult + tk->clock->maxadj))) { | |
6d9bcb62 | 1161 | printk_deferred_once(KERN_WARNING |
e919cfd4 | 1162 | "Adjusting %s more than 11%% (%ld vs %ld)\n", |
f726a697 JS |
1163 | tk->clock->name, (long)tk->mult + adj, |
1164 | (long)tk->clock->mult + tk->clock->maxadj); | |
e919cfd4 | 1165 | } |
c2bc1111 JS |
1166 | /* |
1167 | * So the following can be confusing. | |
1168 | * | |
1169 | * To keep things simple, lets assume adj == 1 for now. | |
1170 | * | |
1171 | * When adj != 1, remember that the interval and offset values | |
1172 | * have been appropriately scaled so the math is the same. | |
1173 | * | |
1174 | * The basic idea here is that we're increasing the multiplier | |
1175 | * by one, this causes the xtime_interval to be incremented by | |
1176 | * one cycle_interval. This is because: | |
1177 | * xtime_interval = cycle_interval * mult | |
1178 | * So if mult is being incremented by one: | |
1179 | * xtime_interval = cycle_interval * (mult + 1) | |
1180 | * Its the same as: | |
1181 | * xtime_interval = (cycle_interval * mult) + cycle_interval | |
1182 | * Which can be shortened to: | |
1183 | * xtime_interval += cycle_interval | |
1184 | * | |
1185 | * So offset stores the non-accumulated cycles. Thus the current | |
1186 | * time (in shifted nanoseconds) is: | |
1187 | * now = (offset * adj) + xtime_nsec | |
1188 | * Now, even though we're adjusting the clock frequency, we have | |
1189 | * to keep time consistent. In other words, we can't jump back | |
1190 | * in time, and we also want to avoid jumping forward in time. | |
1191 | * | |
1192 | * So given the same offset value, we need the time to be the same | |
1193 | * both before and after the freq adjustment. | |
1194 | * now = (offset * adj_1) + xtime_nsec_1 | |
1195 | * now = (offset * adj_2) + xtime_nsec_2 | |
1196 | * So: | |
1197 | * (offset * adj_1) + xtime_nsec_1 = | |
1198 | * (offset * adj_2) + xtime_nsec_2 | |
1199 | * And we know: | |
1200 | * adj_2 = adj_1 + 1 | |
1201 | * So: | |
1202 | * (offset * adj_1) + xtime_nsec_1 = | |
1203 | * (offset * (adj_1+1)) + xtime_nsec_2 | |
1204 | * (offset * adj_1) + xtime_nsec_1 = | |
1205 | * (offset * adj_1) + offset + xtime_nsec_2 | |
1206 | * Canceling the sides: | |
1207 | * xtime_nsec_1 = offset + xtime_nsec_2 | |
1208 | * Which gives us: | |
1209 | * xtime_nsec_2 = xtime_nsec_1 - offset | |
1210 | * Which simplfies to: | |
1211 | * xtime_nsec -= offset | |
1212 | * | |
1213 | * XXX - TODO: Doc ntp_error calculation. | |
1214 | */ | |
f726a697 JS |
1215 | tk->mult += adj; |
1216 | tk->xtime_interval += interval; | |
1217 | tk->xtime_nsec -= offset; | |
1218 | tk->ntp_error -= (interval - offset) << tk->ntp_error_shift; | |
2a8c0883 | 1219 | |
1d17d174 | 1220 | out_adjust: |
2a8c0883 JS |
1221 | /* |
1222 | * It may be possible that when we entered this function, xtime_nsec | |
1223 | * was very small. Further, if we're slightly speeding the clocksource | |
1224 | * in the code above, its possible the required corrective factor to | |
1225 | * xtime_nsec could cause it to underflow. | |
1226 | * | |
1227 | * Now, since we already accumulated the second, cannot simply roll | |
1228 | * the accumulated second back, since the NTP subsystem has been | |
1229 | * notified via second_overflow. So instead we push xtime_nsec forward | |
1230 | * by the amount we underflowed, and add that amount into the error. | |
1231 | * | |
1232 | * We'll correct this error next time through this function, when | |
1233 | * xtime_nsec is not as small. | |
1234 | */ | |
f726a697 JS |
1235 | if (unlikely((s64)tk->xtime_nsec < 0)) { |
1236 | s64 neg = -(s64)tk->xtime_nsec; | |
1237 | tk->xtime_nsec = 0; | |
1238 | tk->ntp_error += neg << tk->ntp_error_shift; | |
2a8c0883 JS |
1239 | } |
1240 | ||
8524070b | 1241 | } |
1242 | ||
1f4f9487 JS |
1243 | /** |
1244 | * accumulate_nsecs_to_secs - Accumulates nsecs into secs | |
1245 | * | |
1246 | * Helper function that accumulates a the nsecs greater then a second | |
1247 | * from the xtime_nsec field to the xtime_secs field. | |
1248 | * It also calls into the NTP code to handle leapsecond processing. | |
1249 | * | |
1250 | */ | |
780427f0 | 1251 | static inline unsigned int accumulate_nsecs_to_secs(struct timekeeper *tk) |
1f4f9487 JS |
1252 | { |
1253 | u64 nsecps = (u64)NSEC_PER_SEC << tk->shift; | |
5258d3f2 | 1254 | unsigned int clock_set = 0; |
1f4f9487 JS |
1255 | |
1256 | while (tk->xtime_nsec >= nsecps) { | |
1257 | int leap; | |
1258 | ||
1259 | tk->xtime_nsec -= nsecps; | |
1260 | tk->xtime_sec++; | |
1261 | ||
1262 | /* Figure out if its a leap sec and apply if needed */ | |
1263 | leap = second_overflow(tk->xtime_sec); | |
6d0ef903 JS |
1264 | if (unlikely(leap)) { |
1265 | struct timespec ts; | |
1266 | ||
1267 | tk->xtime_sec += leap; | |
1f4f9487 | 1268 | |
6d0ef903 JS |
1269 | ts.tv_sec = leap; |
1270 | ts.tv_nsec = 0; | |
1271 | tk_set_wall_to_mono(tk, | |
1272 | timespec_sub(tk->wall_to_monotonic, ts)); | |
1273 | ||
cc244dda JS |
1274 | __timekeeping_set_tai_offset(tk, tk->tai_offset - leap); |
1275 | ||
5258d3f2 | 1276 | clock_set = TK_CLOCK_WAS_SET; |
6d0ef903 | 1277 | } |
1f4f9487 | 1278 | } |
5258d3f2 | 1279 | return clock_set; |
1f4f9487 JS |
1280 | } |
1281 | ||
a092ff0f | 1282 | /** |
1283 | * logarithmic_accumulation - shifted accumulation of cycles | |
1284 | * | |
1285 | * This functions accumulates a shifted interval of cycles into | |
1286 | * into a shifted interval nanoseconds. Allows for O(log) accumulation | |
1287 | * loop. | |
1288 | * | |
1289 | * Returns the unconsumed cycles. | |
1290 | */ | |
f726a697 | 1291 | static cycle_t logarithmic_accumulation(struct timekeeper *tk, cycle_t offset, |
5258d3f2 JS |
1292 | u32 shift, |
1293 | unsigned int *clock_set) | |
a092ff0f | 1294 | { |
23a9537a | 1295 | cycle_t interval = tk->cycle_interval << shift; |
deda2e81 | 1296 | u64 raw_nsecs; |
a092ff0f | 1297 | |
f726a697 | 1298 | /* If the offset is smaller then a shifted interval, do nothing */ |
23a9537a | 1299 | if (offset < interval) |
a092ff0f | 1300 | return offset; |
1301 | ||
1302 | /* Accumulate one shifted interval */ | |
23a9537a | 1303 | offset -= interval; |
7ec98e15 | 1304 | tk->cycle_last += interval; |
a092ff0f | 1305 | |
f726a697 | 1306 | tk->xtime_nsec += tk->xtime_interval << shift; |
5258d3f2 | 1307 | *clock_set |= accumulate_nsecs_to_secs(tk); |
a092ff0f | 1308 | |
deda2e81 | 1309 | /* Accumulate raw time */ |
5b3900cd | 1310 | raw_nsecs = (u64)tk->raw_interval << shift; |
f726a697 | 1311 | raw_nsecs += tk->raw_time.tv_nsec; |
c7dcf87a JS |
1312 | if (raw_nsecs >= NSEC_PER_SEC) { |
1313 | u64 raw_secs = raw_nsecs; | |
1314 | raw_nsecs = do_div(raw_secs, NSEC_PER_SEC); | |
f726a697 | 1315 | tk->raw_time.tv_sec += raw_secs; |
a092ff0f | 1316 | } |
f726a697 | 1317 | tk->raw_time.tv_nsec = raw_nsecs; |
a092ff0f | 1318 | |
1319 | /* Accumulate error between NTP and clock interval */ | |
f726a697 JS |
1320 | tk->ntp_error += ntp_tick_length() << shift; |
1321 | tk->ntp_error -= (tk->xtime_interval + tk->xtime_remainder) << | |
1322 | (tk->ntp_error_shift + shift); | |
a092ff0f | 1323 | |
1324 | return offset; | |
1325 | } | |
1326 | ||
92bb1fcf JS |
1327 | #ifdef CONFIG_GENERIC_TIME_VSYSCALL_OLD |
1328 | static inline void old_vsyscall_fixup(struct timekeeper *tk) | |
1329 | { | |
1330 | s64 remainder; | |
1331 | ||
1332 | /* | |
1333 | * Store only full nanoseconds into xtime_nsec after rounding | |
1334 | * it up and add the remainder to the error difference. | |
1335 | * XXX - This is necessary to avoid small 1ns inconsistnecies caused | |
1336 | * by truncating the remainder in vsyscalls. However, it causes | |
1337 | * additional work to be done in timekeeping_adjust(). Once | |
1338 | * the vsyscall implementations are converted to use xtime_nsec | |
1339 | * (shifted nanoseconds), and CONFIG_GENERIC_TIME_VSYSCALL_OLD | |
1340 | * users are removed, this can be killed. | |
1341 | */ | |
1342 | remainder = tk->xtime_nsec & ((1ULL << tk->shift) - 1); | |
1343 | tk->xtime_nsec -= remainder; | |
1344 | tk->xtime_nsec += 1ULL << tk->shift; | |
1345 | tk->ntp_error += remainder << tk->ntp_error_shift; | |
4be77398 | 1346 | tk->ntp_error -= (1ULL << tk->shift) << tk->ntp_error_shift; |
92bb1fcf JS |
1347 | } |
1348 | #else | |
1349 | #define old_vsyscall_fixup(tk) | |
1350 | #endif | |
1351 | ||
1352 | ||
1353 | ||
8524070b | 1354 | /** |
1355 | * update_wall_time - Uses the current clocksource to increment the wall time | |
1356 | * | |
8524070b | 1357 | */ |
47a1b796 | 1358 | void update_wall_time(void) |
8524070b | 1359 | { |
155ec602 | 1360 | struct clocksource *clock; |
48cdc135 TG |
1361 | struct timekeeper *real_tk = &timekeeper; |
1362 | struct timekeeper *tk = &shadow_timekeeper; | |
8524070b | 1363 | cycle_t offset; |
a092ff0f | 1364 | int shift = 0, maxshift; |
5258d3f2 | 1365 | unsigned int clock_set = 0; |
70471f2f JS |
1366 | unsigned long flags; |
1367 | ||
9a7a71b1 | 1368 | raw_spin_lock_irqsave(&timekeeper_lock, flags); |
8524070b | 1369 | |
1370 | /* Make sure we're fully resumed: */ | |
1371 | if (unlikely(timekeeping_suspended)) | |
70471f2f | 1372 | goto out; |
8524070b | 1373 | |
48cdc135 | 1374 | clock = real_tk->clock; |
592913ec JS |
1375 | |
1376 | #ifdef CONFIG_ARCH_USES_GETTIMEOFFSET | |
48cdc135 | 1377 | offset = real_tk->cycle_interval; |
592913ec JS |
1378 | #else |
1379 | offset = (clock->read(clock) - clock->cycle_last) & clock->mask; | |
8524070b | 1380 | #endif |
8524070b | 1381 | |
bf2ac312 | 1382 | /* Check if there's really nothing to do */ |
48cdc135 | 1383 | if (offset < real_tk->cycle_interval) |
bf2ac312 JS |
1384 | goto out; |
1385 | ||
a092ff0f | 1386 | /* |
1387 | * With NO_HZ we may have to accumulate many cycle_intervals | |
1388 | * (think "ticks") worth of time at once. To do this efficiently, | |
1389 | * we calculate the largest doubling multiple of cycle_intervals | |
88b28adf | 1390 | * that is smaller than the offset. We then accumulate that |
a092ff0f | 1391 | * chunk in one go, and then try to consume the next smaller |
1392 | * doubled multiple. | |
8524070b | 1393 | */ |
4e250fdd | 1394 | shift = ilog2(offset) - ilog2(tk->cycle_interval); |
a092ff0f | 1395 | shift = max(0, shift); |
88b28adf | 1396 | /* Bound shift to one less than what overflows tick_length */ |
ea7cf49a | 1397 | maxshift = (64 - (ilog2(ntp_tick_length())+1)) - 1; |
a092ff0f | 1398 | shift = min(shift, maxshift); |
4e250fdd | 1399 | while (offset >= tk->cycle_interval) { |
5258d3f2 JS |
1400 | offset = logarithmic_accumulation(tk, offset, shift, |
1401 | &clock_set); | |
4e250fdd | 1402 | if (offset < tk->cycle_interval<<shift) |
830ec045 | 1403 | shift--; |
8524070b | 1404 | } |
1405 | ||
1406 | /* correct the clock when NTP error is too big */ | |
4e250fdd | 1407 | timekeeping_adjust(tk, offset); |
8524070b | 1408 | |
6a867a39 | 1409 | /* |
92bb1fcf JS |
1410 | * XXX This can be killed once everyone converts |
1411 | * to the new update_vsyscall. | |
1412 | */ | |
1413 | old_vsyscall_fixup(tk); | |
8524070b | 1414 | |
6a867a39 JS |
1415 | /* |
1416 | * Finally, make sure that after the rounding | |
1e75fa8b | 1417 | * xtime_nsec isn't larger than NSEC_PER_SEC |
6a867a39 | 1418 | */ |
5258d3f2 | 1419 | clock_set |= accumulate_nsecs_to_secs(tk); |
83f57a11 | 1420 | |
ca4523cd | 1421 | write_seqcount_begin(&timekeeper_seq); |
7ec98e15 TG |
1422 | /* Update clock->cycle_last with the new value */ |
1423 | clock->cycle_last = tk->cycle_last; | |
48cdc135 TG |
1424 | /* |
1425 | * Update the real timekeeper. | |
1426 | * | |
1427 | * We could avoid this memcpy by switching pointers, but that | |
1428 | * requires changes to all other timekeeper usage sites as | |
1429 | * well, i.e. move the timekeeper pointer getter into the | |
1430 | * spinlocked/seqcount protected sections. And we trade this | |
1431 | * memcpy under the timekeeper_seq against one before we start | |
1432 | * updating. | |
1433 | */ | |
1434 | memcpy(real_tk, tk, sizeof(*tk)); | |
5258d3f2 | 1435 | timekeeping_update(real_tk, clock_set); |
9a7a71b1 | 1436 | write_seqcount_end(&timekeeper_seq); |
ca4523cd | 1437 | out: |
9a7a71b1 | 1438 | raw_spin_unlock_irqrestore(&timekeeper_lock, flags); |
47a1b796 | 1439 | if (clock_set) |
cab5e127 JS |
1440 | /* Have to call _delayed version, since in irq context*/ |
1441 | clock_was_set_delayed(); | |
8524070b | 1442 | } |
7c3f1a57 TJ |
1443 | |
1444 | /** | |
1445 | * getboottime - Return the real time of system boot. | |
1446 | * @ts: pointer to the timespec to be set | |
1447 | * | |
abb3a4ea | 1448 | * Returns the wall-time of boot in a timespec. |
7c3f1a57 TJ |
1449 | * |
1450 | * This is based on the wall_to_monotonic offset and the total suspend | |
1451 | * time. Calls to settimeofday will affect the value returned (which | |
1452 | * basically means that however wrong your real time clock is at boot time, | |
1453 | * you get the right time here). | |
1454 | */ | |
1455 | void getboottime(struct timespec *ts) | |
1456 | { | |
4e250fdd | 1457 | struct timekeeper *tk = &timekeeper; |
36d47481 | 1458 | struct timespec boottime = { |
4e250fdd JS |
1459 | .tv_sec = tk->wall_to_monotonic.tv_sec + |
1460 | tk->total_sleep_time.tv_sec, | |
1461 | .tv_nsec = tk->wall_to_monotonic.tv_nsec + | |
1462 | tk->total_sleep_time.tv_nsec | |
36d47481 | 1463 | }; |
d4f587c6 | 1464 | |
d4f587c6 | 1465 | set_normalized_timespec(ts, -boottime.tv_sec, -boottime.tv_nsec); |
7c3f1a57 | 1466 | } |
c93d89f3 | 1467 | EXPORT_SYMBOL_GPL(getboottime); |
7c3f1a57 | 1468 | |
abb3a4ea JS |
1469 | /** |
1470 | * get_monotonic_boottime - Returns monotonic time since boot | |
1471 | * @ts: pointer to the timespec to be set | |
1472 | * | |
1473 | * Returns the monotonic time since boot in a timespec. | |
1474 | * | |
1475 | * This is similar to CLOCK_MONTONIC/ktime_get_ts, but also | |
1476 | * includes the time spent in suspend. | |
1477 | */ | |
1478 | void get_monotonic_boottime(struct timespec *ts) | |
1479 | { | |
4e250fdd | 1480 | struct timekeeper *tk = &timekeeper; |
abb3a4ea | 1481 | struct timespec tomono, sleep; |
ec145bab | 1482 | s64 nsec; |
abb3a4ea | 1483 | unsigned int seq; |
abb3a4ea JS |
1484 | |
1485 | WARN_ON(timekeeping_suspended); | |
1486 | ||
1487 | do { | |
9a7a71b1 | 1488 | seq = read_seqcount_begin(&timekeeper_seq); |
4e250fdd | 1489 | ts->tv_sec = tk->xtime_sec; |
ec145bab | 1490 | nsec = timekeeping_get_ns(tk); |
4e250fdd JS |
1491 | tomono = tk->wall_to_monotonic; |
1492 | sleep = tk->total_sleep_time; | |
abb3a4ea | 1493 | |
9a7a71b1 | 1494 | } while (read_seqcount_retry(&timekeeper_seq, seq)); |
abb3a4ea | 1495 | |
ec145bab JS |
1496 | ts->tv_sec += tomono.tv_sec + sleep.tv_sec; |
1497 | ts->tv_nsec = 0; | |
1498 | timespec_add_ns(ts, nsec + tomono.tv_nsec + sleep.tv_nsec); | |
abb3a4ea JS |
1499 | } |
1500 | EXPORT_SYMBOL_GPL(get_monotonic_boottime); | |
1501 | ||
1502 | /** | |
1503 | * ktime_get_boottime - Returns monotonic time since boot in a ktime | |
1504 | * | |
1505 | * Returns the monotonic time since boot in a ktime | |
1506 | * | |
1507 | * This is similar to CLOCK_MONTONIC/ktime_get, but also | |
1508 | * includes the time spent in suspend. | |
1509 | */ | |
1510 | ktime_t ktime_get_boottime(void) | |
1511 | { | |
1512 | struct timespec ts; | |
1513 | ||
1514 | get_monotonic_boottime(&ts); | |
1515 | return timespec_to_ktime(ts); | |
1516 | } | |
1517 | EXPORT_SYMBOL_GPL(ktime_get_boottime); | |
1518 | ||
7c3f1a57 TJ |
1519 | /** |
1520 | * monotonic_to_bootbased - Convert the monotonic time to boot based. | |
1521 | * @ts: pointer to the timespec to be converted | |
1522 | */ | |
1523 | void monotonic_to_bootbased(struct timespec *ts) | |
1524 | { | |
4e250fdd JS |
1525 | struct timekeeper *tk = &timekeeper; |
1526 | ||
1527 | *ts = timespec_add(*ts, tk->total_sleep_time); | |
7c3f1a57 | 1528 | } |
c93d89f3 | 1529 | EXPORT_SYMBOL_GPL(monotonic_to_bootbased); |
2c6b47de | 1530 | |
17c38b74 | 1531 | unsigned long get_seconds(void) |
1532 | { | |
4e250fdd JS |
1533 | struct timekeeper *tk = &timekeeper; |
1534 | ||
1535 | return tk->xtime_sec; | |
17c38b74 | 1536 | } |
1537 | EXPORT_SYMBOL(get_seconds); | |
1538 | ||
da15cfda | 1539 | struct timespec __current_kernel_time(void) |
1540 | { | |
4e250fdd JS |
1541 | struct timekeeper *tk = &timekeeper; |
1542 | ||
1543 | return tk_xtime(tk); | |
da15cfda | 1544 | } |
17c38b74 | 1545 | |
2c6b47de | 1546 | struct timespec current_kernel_time(void) |
1547 | { | |
4e250fdd | 1548 | struct timekeeper *tk = &timekeeper; |
2c6b47de | 1549 | struct timespec now; |
1550 | unsigned long seq; | |
1551 | ||
1552 | do { | |
9a7a71b1 | 1553 | seq = read_seqcount_begin(&timekeeper_seq); |
83f57a11 | 1554 | |
4e250fdd | 1555 | now = tk_xtime(tk); |
9a7a71b1 | 1556 | } while (read_seqcount_retry(&timekeeper_seq, seq)); |
2c6b47de | 1557 | |
1558 | return now; | |
1559 | } | |
2c6b47de | 1560 | EXPORT_SYMBOL(current_kernel_time); |
da15cfda | 1561 | |
1562 | struct timespec get_monotonic_coarse(void) | |
1563 | { | |
4e250fdd | 1564 | struct timekeeper *tk = &timekeeper; |
da15cfda | 1565 | struct timespec now, mono; |
1566 | unsigned long seq; | |
1567 | ||
1568 | do { | |
9a7a71b1 | 1569 | seq = read_seqcount_begin(&timekeeper_seq); |
83f57a11 | 1570 | |
4e250fdd JS |
1571 | now = tk_xtime(tk); |
1572 | mono = tk->wall_to_monotonic; | |
9a7a71b1 | 1573 | } while (read_seqcount_retry(&timekeeper_seq, seq)); |
da15cfda | 1574 | |
1575 | set_normalized_timespec(&now, now.tv_sec + mono.tv_sec, | |
1576 | now.tv_nsec + mono.tv_nsec); | |
1577 | return now; | |
1578 | } | |
871cf1e5 TH |
1579 | |
1580 | /* | |
d6ad4187 | 1581 | * Must hold jiffies_lock |
871cf1e5 TH |
1582 | */ |
1583 | void do_timer(unsigned long ticks) | |
1584 | { | |
1585 | jiffies_64 += ticks; | |
871cf1e5 TH |
1586 | calc_global_load(ticks); |
1587 | } | |
48cf76f7 TH |
1588 | |
1589 | /** | |
314ac371 JS |
1590 | * get_xtime_and_monotonic_and_sleep_offset() - get xtime, wall_to_monotonic, |
1591 | * and sleep offsets. | |
48cf76f7 TH |
1592 | * @xtim: pointer to timespec to be set with xtime |
1593 | * @wtom: pointer to timespec to be set with wall_to_monotonic | |
314ac371 | 1594 | * @sleep: pointer to timespec to be set with time in suspend |
48cf76f7 | 1595 | */ |
314ac371 JS |
1596 | void get_xtime_and_monotonic_and_sleep_offset(struct timespec *xtim, |
1597 | struct timespec *wtom, struct timespec *sleep) | |
48cf76f7 | 1598 | { |
4e250fdd | 1599 | struct timekeeper *tk = &timekeeper; |
48cf76f7 TH |
1600 | unsigned long seq; |
1601 | ||
1602 | do { | |
9a7a71b1 | 1603 | seq = read_seqcount_begin(&timekeeper_seq); |
4e250fdd JS |
1604 | *xtim = tk_xtime(tk); |
1605 | *wtom = tk->wall_to_monotonic; | |
1606 | *sleep = tk->total_sleep_time; | |
9a7a71b1 | 1607 | } while (read_seqcount_retry(&timekeeper_seq, seq)); |
48cf76f7 | 1608 | } |
f0af911a | 1609 | |
f6c06abf TG |
1610 | #ifdef CONFIG_HIGH_RES_TIMERS |
1611 | /** | |
1612 | * ktime_get_update_offsets - hrtimer helper | |
1613 | * @offs_real: pointer to storage for monotonic -> realtime offset | |
1614 | * @offs_boot: pointer to storage for monotonic -> boottime offset | |
b7bc50e4 | 1615 | * @offs_tai: pointer to storage for monotonic -> clock tai offset |
f6c06abf TG |
1616 | * |
1617 | * Returns current monotonic time and updates the offsets | |
b7bc50e4 | 1618 | * Called from hrtimer_interrupt() or retrigger_next_event() |
f6c06abf | 1619 | */ |
90adda98 JS |
1620 | ktime_t ktime_get_update_offsets(ktime_t *offs_real, ktime_t *offs_boot, |
1621 | ktime_t *offs_tai) | |
f6c06abf | 1622 | { |
4e250fdd | 1623 | struct timekeeper *tk = &timekeeper; |
f6c06abf TG |
1624 | ktime_t now; |
1625 | unsigned int seq; | |
1626 | u64 secs, nsecs; | |
1627 | ||
1628 | do { | |
9a7a71b1 | 1629 | seq = read_seqcount_begin(&timekeeper_seq); |
f6c06abf | 1630 | |
4e250fdd JS |
1631 | secs = tk->xtime_sec; |
1632 | nsecs = timekeeping_get_ns(tk); | |
f6c06abf | 1633 | |
4e250fdd JS |
1634 | *offs_real = tk->offs_real; |
1635 | *offs_boot = tk->offs_boot; | |
90adda98 | 1636 | *offs_tai = tk->offs_tai; |
9a7a71b1 | 1637 | } while (read_seqcount_retry(&timekeeper_seq, seq)); |
f6c06abf TG |
1638 | |
1639 | now = ktime_add_ns(ktime_set(secs, 0), nsecs); | |
1640 | now = ktime_sub(now, *offs_real); | |
1641 | return now; | |
1642 | } | |
1643 | #endif | |
1644 | ||
99ee5315 TG |
1645 | /** |
1646 | * ktime_get_monotonic_offset() - get wall_to_monotonic in ktime_t format | |
1647 | */ | |
1648 | ktime_t ktime_get_monotonic_offset(void) | |
1649 | { | |
4e250fdd | 1650 | struct timekeeper *tk = &timekeeper; |
99ee5315 TG |
1651 | unsigned long seq; |
1652 | struct timespec wtom; | |
1653 | ||
1654 | do { | |
9a7a71b1 | 1655 | seq = read_seqcount_begin(&timekeeper_seq); |
4e250fdd | 1656 | wtom = tk->wall_to_monotonic; |
9a7a71b1 | 1657 | } while (read_seqcount_retry(&timekeeper_seq, seq)); |
70471f2f | 1658 | |
99ee5315 TG |
1659 | return timespec_to_ktime(wtom); |
1660 | } | |
a80b83b7 JS |
1661 | EXPORT_SYMBOL_GPL(ktime_get_monotonic_offset); |
1662 | ||
aa6f9c59 JS |
1663 | /** |
1664 | * do_adjtimex() - Accessor function to NTP __do_adjtimex function | |
1665 | */ | |
1666 | int do_adjtimex(struct timex *txc) | |
1667 | { | |
0b5154fb | 1668 | struct timekeeper *tk = &timekeeper; |
06c017fd | 1669 | unsigned long flags; |
87ace39b | 1670 | struct timespec ts; |
4e8f8b34 | 1671 | s32 orig_tai, tai; |
e4085693 JS |
1672 | int ret; |
1673 | ||
1674 | /* Validate the data before disabling interrupts */ | |
1675 | ret = ntp_validate_timex(txc); | |
1676 | if (ret) | |
1677 | return ret; | |
1678 | ||
cef90377 JS |
1679 | if (txc->modes & ADJ_SETOFFSET) { |
1680 | struct timespec delta; | |
1681 | delta.tv_sec = txc->time.tv_sec; | |
1682 | delta.tv_nsec = txc->time.tv_usec; | |
1683 | if (!(txc->modes & ADJ_NANO)) | |
1684 | delta.tv_nsec *= 1000; | |
1685 | ret = timekeeping_inject_offset(&delta); | |
1686 | if (ret) | |
1687 | return ret; | |
1688 | } | |
1689 | ||
87ace39b | 1690 | getnstimeofday(&ts); |
87ace39b | 1691 | |
06c017fd JS |
1692 | raw_spin_lock_irqsave(&timekeeper_lock, flags); |
1693 | write_seqcount_begin(&timekeeper_seq); | |
1694 | ||
4e8f8b34 | 1695 | orig_tai = tai = tk->tai_offset; |
87ace39b | 1696 | ret = __do_adjtimex(txc, &ts, &tai); |
aa6f9c59 | 1697 | |
4e8f8b34 JS |
1698 | if (tai != orig_tai) { |
1699 | __timekeeping_set_tai_offset(tk, tai); | |
f55c0760 | 1700 | timekeeping_update(tk, TK_MIRROR | TK_CLOCK_WAS_SET); |
4e8f8b34 | 1701 | } |
06c017fd JS |
1702 | write_seqcount_end(&timekeeper_seq); |
1703 | raw_spin_unlock_irqrestore(&timekeeper_lock, flags); | |
1704 | ||
6fdda9a9 JS |
1705 | if (tai != orig_tai) |
1706 | clock_was_set(); | |
1707 | ||
7bd36014 JS |
1708 | ntp_notify_cmos_timer(); |
1709 | ||
87ace39b JS |
1710 | return ret; |
1711 | } | |
aa6f9c59 JS |
1712 | |
1713 | #ifdef CONFIG_NTP_PPS | |
1714 | /** | |
1715 | * hardpps() - Accessor function to NTP __hardpps function | |
1716 | */ | |
1717 | void hardpps(const struct timespec *phase_ts, const struct timespec *raw_ts) | |
1718 | { | |
06c017fd JS |
1719 | unsigned long flags; |
1720 | ||
1721 | raw_spin_lock_irqsave(&timekeeper_lock, flags); | |
1722 | write_seqcount_begin(&timekeeper_seq); | |
1723 | ||
aa6f9c59 | 1724 | __hardpps(phase_ts, raw_ts); |
06c017fd JS |
1725 | |
1726 | write_seqcount_end(&timekeeper_seq); | |
1727 | raw_spin_unlock_irqrestore(&timekeeper_lock, flags); | |
aa6f9c59 JS |
1728 | } |
1729 | EXPORT_SYMBOL(hardpps); | |
1730 | #endif | |
1731 | ||
f0af911a TH |
1732 | /** |
1733 | * xtime_update() - advances the timekeeping infrastructure | |
1734 | * @ticks: number of ticks, that have elapsed since the last call. | |
1735 | * | |
1736 | * Must be called with interrupts disabled. | |
1737 | */ | |
1738 | void xtime_update(unsigned long ticks) | |
1739 | { | |
d6ad4187 | 1740 | write_seqlock(&jiffies_lock); |
f0af911a | 1741 | do_timer(ticks); |
d6ad4187 | 1742 | write_sequnlock(&jiffies_lock); |
47a1b796 | 1743 | update_wall_time(); |
f0af911a | 1744 | } |