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 | |
3fdb14fd TG |
35 | /* |
36 | * The most important data for readout fits into a single 64 byte | |
37 | * cache line. | |
38 | */ | |
39 | static struct { | |
40 | seqcount_t seq; | |
41 | struct timekeeper timekeeper; | |
42 | } tk_core ____cacheline_aligned; | |
43 | ||
9a7a71b1 | 44 | static DEFINE_RAW_SPINLOCK(timekeeper_lock); |
48cdc135 | 45 | static struct timekeeper shadow_timekeeper; |
155ec602 | 46 | |
4396e058 TG |
47 | /** |
48 | * struct tk_fast - NMI safe timekeeper | |
49 | * @seq: Sequence counter for protecting updates. The lowest bit | |
50 | * is the index for the tk_read_base array | |
51 | * @base: tk_read_base array. Access is indexed by the lowest bit of | |
52 | * @seq. | |
53 | * | |
54 | * See @update_fast_timekeeper() below. | |
55 | */ | |
56 | struct tk_fast { | |
57 | seqcount_t seq; | |
58 | struct tk_read_base base[2]; | |
59 | }; | |
60 | ||
61 | static struct tk_fast tk_fast_mono ____cacheline_aligned; | |
62 | ||
8fcce546 JS |
63 | /* flag for if timekeeping is suspended */ |
64 | int __read_mostly timekeeping_suspended; | |
65 | ||
31ade306 FT |
66 | /* Flag for if there is a persistent clock on this platform */ |
67 | bool __read_mostly persistent_clock_exist = false; | |
68 | ||
1e75fa8b JS |
69 | static inline void tk_normalize_xtime(struct timekeeper *tk) |
70 | { | |
d28ede83 TG |
71 | while (tk->tkr.xtime_nsec >= ((u64)NSEC_PER_SEC << tk->tkr.shift)) { |
72 | tk->tkr.xtime_nsec -= (u64)NSEC_PER_SEC << tk->tkr.shift; | |
1e75fa8b JS |
73 | tk->xtime_sec++; |
74 | } | |
75 | } | |
76 | ||
c905fae4 TG |
77 | static inline struct timespec64 tk_xtime(struct timekeeper *tk) |
78 | { | |
79 | struct timespec64 ts; | |
80 | ||
81 | ts.tv_sec = tk->xtime_sec; | |
d28ede83 | 82 | ts.tv_nsec = (long)(tk->tkr.xtime_nsec >> tk->tkr.shift); |
c905fae4 TG |
83 | return ts; |
84 | } | |
85 | ||
7d489d15 | 86 | static void tk_set_xtime(struct timekeeper *tk, const struct timespec64 *ts) |
1e75fa8b JS |
87 | { |
88 | tk->xtime_sec = ts->tv_sec; | |
d28ede83 | 89 | tk->tkr.xtime_nsec = (u64)ts->tv_nsec << tk->tkr.shift; |
1e75fa8b JS |
90 | } |
91 | ||
7d489d15 | 92 | static void tk_xtime_add(struct timekeeper *tk, const struct timespec64 *ts) |
1e75fa8b JS |
93 | { |
94 | tk->xtime_sec += ts->tv_sec; | |
d28ede83 | 95 | tk->tkr.xtime_nsec += (u64)ts->tv_nsec << tk->tkr.shift; |
784ffcbb | 96 | tk_normalize_xtime(tk); |
1e75fa8b | 97 | } |
8fcce546 | 98 | |
7d489d15 | 99 | static void tk_set_wall_to_mono(struct timekeeper *tk, struct timespec64 wtm) |
6d0ef903 | 100 | { |
7d489d15 | 101 | struct timespec64 tmp; |
6d0ef903 JS |
102 | |
103 | /* | |
104 | * Verify consistency of: offset_real = -wall_to_monotonic | |
105 | * before modifying anything | |
106 | */ | |
7d489d15 | 107 | set_normalized_timespec64(&tmp, -tk->wall_to_monotonic.tv_sec, |
6d0ef903 | 108 | -tk->wall_to_monotonic.tv_nsec); |
7d489d15 | 109 | WARN_ON_ONCE(tk->offs_real.tv64 != timespec64_to_ktime(tmp).tv64); |
6d0ef903 | 110 | tk->wall_to_monotonic = wtm; |
7d489d15 JS |
111 | set_normalized_timespec64(&tmp, -wtm.tv_sec, -wtm.tv_nsec); |
112 | tk->offs_real = timespec64_to_ktime(tmp); | |
04005f60 | 113 | tk->offs_tai = ktime_add(tk->offs_real, ktime_set(tk->tai_offset, 0)); |
6d0ef903 JS |
114 | } |
115 | ||
47da70d3 | 116 | static inline void tk_update_sleep_time(struct timekeeper *tk, ktime_t delta) |
6d0ef903 | 117 | { |
47da70d3 | 118 | tk->offs_boot = ktime_add(tk->offs_boot, delta); |
6d0ef903 JS |
119 | } |
120 | ||
155ec602 | 121 | /** |
d26e4fe0 | 122 | * tk_setup_internals - Set up internals to use clocksource clock. |
155ec602 | 123 | * |
d26e4fe0 | 124 | * @tk: The target timekeeper to setup. |
155ec602 MS |
125 | * @clock: Pointer to clocksource. |
126 | * | |
127 | * Calculates a fixed cycle/nsec interval for a given clocksource/adjustment | |
128 | * pair and interval request. | |
129 | * | |
130 | * Unless you're the timekeeping code, you should not be using this! | |
131 | */ | |
f726a697 | 132 | static void tk_setup_internals(struct timekeeper *tk, struct clocksource *clock) |
155ec602 MS |
133 | { |
134 | cycle_t interval; | |
a386b5af | 135 | u64 tmp, ntpinterval; |
1e75fa8b | 136 | struct clocksource *old_clock; |
155ec602 | 137 | |
d28ede83 TG |
138 | old_clock = tk->tkr.clock; |
139 | tk->tkr.clock = clock; | |
140 | tk->tkr.read = clock->read; | |
141 | tk->tkr.mask = clock->mask; | |
142 | tk->tkr.cycle_last = tk->tkr.read(clock); | |
155ec602 MS |
143 | |
144 | /* Do the ns -> cycle conversion first, using original mult */ | |
145 | tmp = NTP_INTERVAL_LENGTH; | |
146 | tmp <<= clock->shift; | |
a386b5af | 147 | ntpinterval = tmp; |
0a544198 MS |
148 | tmp += clock->mult/2; |
149 | do_div(tmp, clock->mult); | |
155ec602 MS |
150 | if (tmp == 0) |
151 | tmp = 1; | |
152 | ||
153 | interval = (cycle_t) tmp; | |
f726a697 | 154 | tk->cycle_interval = interval; |
155ec602 MS |
155 | |
156 | /* Go back from cycles -> shifted ns */ | |
f726a697 JS |
157 | tk->xtime_interval = (u64) interval * clock->mult; |
158 | tk->xtime_remainder = ntpinterval - tk->xtime_interval; | |
159 | tk->raw_interval = | |
0a544198 | 160 | ((u64) interval * clock->mult) >> clock->shift; |
155ec602 | 161 | |
1e75fa8b JS |
162 | /* if changing clocks, convert xtime_nsec shift units */ |
163 | if (old_clock) { | |
164 | int shift_change = clock->shift - old_clock->shift; | |
165 | if (shift_change < 0) | |
d28ede83 | 166 | tk->tkr.xtime_nsec >>= -shift_change; |
1e75fa8b | 167 | else |
d28ede83 | 168 | tk->tkr.xtime_nsec <<= shift_change; |
1e75fa8b | 169 | } |
d28ede83 | 170 | tk->tkr.shift = clock->shift; |
155ec602 | 171 | |
f726a697 JS |
172 | tk->ntp_error = 0; |
173 | tk->ntp_error_shift = NTP_SCALE_SHIFT - clock->shift; | |
375f45b5 | 174 | tk->ntp_tick = ntpinterval << tk->ntp_error_shift; |
0a544198 MS |
175 | |
176 | /* | |
177 | * The timekeeper keeps its own mult values for the currently | |
178 | * active clocksource. These value will be adjusted via NTP | |
179 | * to counteract clock drifting. | |
180 | */ | |
d28ede83 | 181 | tk->tkr.mult = clock->mult; |
dc491596 | 182 | tk->ntp_err_mult = 0; |
155ec602 | 183 | } |
8524070b | 184 | |
2ba2a305 | 185 | /* Timekeeper helper functions. */ |
7b1f6207 SW |
186 | |
187 | #ifdef CONFIG_ARCH_USES_GETTIMEOFFSET | |
e06fde37 TG |
188 | static u32 default_arch_gettimeoffset(void) { return 0; } |
189 | u32 (*arch_gettimeoffset)(void) = default_arch_gettimeoffset; | |
7b1f6207 | 190 | #else |
e06fde37 | 191 | static inline u32 arch_gettimeoffset(void) { return 0; } |
7b1f6207 SW |
192 | #endif |
193 | ||
0e5ac3a8 | 194 | static inline s64 timekeeping_get_ns(struct tk_read_base *tkr) |
2ba2a305 | 195 | { |
3a978377 | 196 | cycle_t cycle_now, delta; |
1e75fa8b | 197 | s64 nsec; |
2ba2a305 MS |
198 | |
199 | /* read clocksource: */ | |
0e5ac3a8 | 200 | cycle_now = tkr->read(tkr->clock); |
2ba2a305 MS |
201 | |
202 | /* calculate the delta since the last update_wall_time: */ | |
0e5ac3a8 | 203 | delta = clocksource_delta(cycle_now, tkr->cycle_last, tkr->mask); |
2ba2a305 | 204 | |
0e5ac3a8 TG |
205 | nsec = delta * tkr->mult + tkr->xtime_nsec; |
206 | nsec >>= tkr->shift; | |
f2a5a085 | 207 | |
7b1f6207 | 208 | /* If arch requires, add in get_arch_timeoffset() */ |
e06fde37 | 209 | return nsec + arch_gettimeoffset(); |
2ba2a305 MS |
210 | } |
211 | ||
f726a697 | 212 | static inline s64 timekeeping_get_ns_raw(struct timekeeper *tk) |
2ba2a305 | 213 | { |
d28ede83 | 214 | struct clocksource *clock = tk->tkr.clock; |
3a978377 | 215 | cycle_t cycle_now, delta; |
f2a5a085 | 216 | s64 nsec; |
2ba2a305 MS |
217 | |
218 | /* read clocksource: */ | |
d28ede83 | 219 | cycle_now = tk->tkr.read(clock); |
2ba2a305 MS |
220 | |
221 | /* calculate the delta since the last update_wall_time: */ | |
d28ede83 | 222 | delta = clocksource_delta(cycle_now, tk->tkr.cycle_last, tk->tkr.mask); |
2ba2a305 | 223 | |
f2a5a085 | 224 | /* convert delta to nanoseconds. */ |
3a978377 | 225 | nsec = clocksource_cyc2ns(delta, clock->mult, clock->shift); |
f2a5a085 | 226 | |
7b1f6207 | 227 | /* If arch requires, add in get_arch_timeoffset() */ |
e06fde37 | 228 | return nsec + arch_gettimeoffset(); |
2ba2a305 MS |
229 | } |
230 | ||
4396e058 TG |
231 | /** |
232 | * update_fast_timekeeper - Update the fast and NMI safe monotonic timekeeper. | |
233 | * @tk: The timekeeper from which we take the update | |
234 | * @tkf: The fast timekeeper to update | |
235 | * @tbase: The time base for the fast timekeeper (mono/raw) | |
236 | * | |
237 | * We want to use this from any context including NMI and tracing / | |
238 | * instrumenting the timekeeping code itself. | |
239 | * | |
240 | * So we handle this differently than the other timekeeping accessor | |
241 | * functions which retry when the sequence count has changed. The | |
242 | * update side does: | |
243 | * | |
244 | * smp_wmb(); <- Ensure that the last base[1] update is visible | |
245 | * tkf->seq++; | |
246 | * smp_wmb(); <- Ensure that the seqcount update is visible | |
247 | * update(tkf->base[0], tk); | |
248 | * smp_wmb(); <- Ensure that the base[0] update is visible | |
249 | * tkf->seq++; | |
250 | * smp_wmb(); <- Ensure that the seqcount update is visible | |
251 | * update(tkf->base[1], tk); | |
252 | * | |
253 | * The reader side does: | |
254 | * | |
255 | * do { | |
256 | * seq = tkf->seq; | |
257 | * smp_rmb(); | |
258 | * idx = seq & 0x01; | |
259 | * now = now(tkf->base[idx]); | |
260 | * smp_rmb(); | |
261 | * } while (seq != tkf->seq) | |
262 | * | |
263 | * As long as we update base[0] readers are forced off to | |
264 | * base[1]. Once base[0] is updated readers are redirected to base[0] | |
265 | * and the base[1] update takes place. | |
266 | * | |
267 | * So if a NMI hits the update of base[0] then it will use base[1] | |
268 | * which is still consistent. In the worst case this can result is a | |
269 | * slightly wrong timestamp (a few nanoseconds). See | |
270 | * @ktime_get_mono_fast_ns. | |
271 | */ | |
272 | static void update_fast_timekeeper(struct timekeeper *tk) | |
273 | { | |
274 | struct tk_read_base *base = tk_fast_mono.base; | |
275 | ||
276 | /* Force readers off to base[1] */ | |
277 | raw_write_seqcount_latch(&tk_fast_mono.seq); | |
278 | ||
279 | /* Update base[0] */ | |
280 | memcpy(base, &tk->tkr, sizeof(*base)); | |
281 | ||
282 | /* Force readers back to base[0] */ | |
283 | raw_write_seqcount_latch(&tk_fast_mono.seq); | |
284 | ||
285 | /* Update base[1] */ | |
286 | memcpy(base + 1, base, sizeof(*base)); | |
287 | } | |
288 | ||
289 | /** | |
290 | * ktime_get_mono_fast_ns - Fast NMI safe access to clock monotonic | |
291 | * | |
292 | * This timestamp is not guaranteed to be monotonic across an update. | |
293 | * The timestamp is calculated by: | |
294 | * | |
295 | * now = base_mono + clock_delta * slope | |
296 | * | |
297 | * So if the update lowers the slope, readers who are forced to the | |
298 | * not yet updated second array are still using the old steeper slope. | |
299 | * | |
300 | * tmono | |
301 | * ^ | |
302 | * | o n | |
303 | * | o n | |
304 | * | u | |
305 | * | o | |
306 | * |o | |
307 | * |12345678---> reader order | |
308 | * | |
309 | * o = old slope | |
310 | * u = update | |
311 | * n = new slope | |
312 | * | |
313 | * So reader 6 will observe time going backwards versus reader 5. | |
314 | * | |
315 | * While other CPUs are likely to be able observe that, the only way | |
316 | * for a CPU local observation is when an NMI hits in the middle of | |
317 | * the update. Timestamps taken from that NMI context might be ahead | |
318 | * of the following timestamps. Callers need to be aware of that and | |
319 | * deal with it. | |
320 | */ | |
321 | u64 notrace ktime_get_mono_fast_ns(void) | |
322 | { | |
323 | struct tk_read_base *tkr; | |
324 | unsigned int seq; | |
325 | u64 now; | |
326 | ||
327 | do { | |
328 | seq = raw_read_seqcount(&tk_fast_mono.seq); | |
329 | tkr = tk_fast_mono.base + (seq & 0x01); | |
330 | now = ktime_to_ns(tkr->base_mono) + timekeeping_get_ns(tkr); | |
331 | ||
332 | } while (read_seqcount_retry(&tk_fast_mono.seq, seq)); | |
333 | return now; | |
334 | } | |
335 | EXPORT_SYMBOL_GPL(ktime_get_mono_fast_ns); | |
336 | ||
c905fae4 TG |
337 | #ifdef CONFIG_GENERIC_TIME_VSYSCALL_OLD |
338 | ||
339 | static inline void update_vsyscall(struct timekeeper *tk) | |
340 | { | |
0680eb1f | 341 | struct timespec xt, wm; |
c905fae4 | 342 | |
e2dff1ec | 343 | xt = timespec64_to_timespec(tk_xtime(tk)); |
0680eb1f JS |
344 | wm = timespec64_to_timespec(tk->wall_to_monotonic); |
345 | update_vsyscall_old(&xt, &wm, tk->tkr.clock, tk->tkr.mult, | |
d28ede83 | 346 | tk->tkr.cycle_last); |
c905fae4 TG |
347 | } |
348 | ||
349 | static inline void old_vsyscall_fixup(struct timekeeper *tk) | |
350 | { | |
351 | s64 remainder; | |
352 | ||
353 | /* | |
354 | * Store only full nanoseconds into xtime_nsec after rounding | |
355 | * it up and add the remainder to the error difference. | |
356 | * XXX - This is necessary to avoid small 1ns inconsistnecies caused | |
357 | * by truncating the remainder in vsyscalls. However, it causes | |
358 | * additional work to be done in timekeeping_adjust(). Once | |
359 | * the vsyscall implementations are converted to use xtime_nsec | |
360 | * (shifted nanoseconds), and CONFIG_GENERIC_TIME_VSYSCALL_OLD | |
361 | * users are removed, this can be killed. | |
362 | */ | |
d28ede83 TG |
363 | remainder = tk->tkr.xtime_nsec & ((1ULL << tk->tkr.shift) - 1); |
364 | tk->tkr.xtime_nsec -= remainder; | |
365 | tk->tkr.xtime_nsec += 1ULL << tk->tkr.shift; | |
c905fae4 | 366 | tk->ntp_error += remainder << tk->ntp_error_shift; |
d28ede83 | 367 | tk->ntp_error -= (1ULL << tk->tkr.shift) << tk->ntp_error_shift; |
c905fae4 TG |
368 | } |
369 | #else | |
370 | #define old_vsyscall_fixup(tk) | |
371 | #endif | |
372 | ||
e0b306fe MT |
373 | static RAW_NOTIFIER_HEAD(pvclock_gtod_chain); |
374 | ||
780427f0 | 375 | static void update_pvclock_gtod(struct timekeeper *tk, bool was_set) |
e0b306fe | 376 | { |
780427f0 | 377 | raw_notifier_call_chain(&pvclock_gtod_chain, was_set, tk); |
e0b306fe MT |
378 | } |
379 | ||
380 | /** | |
381 | * pvclock_gtod_register_notifier - register a pvclock timedata update listener | |
e0b306fe MT |
382 | */ |
383 | int pvclock_gtod_register_notifier(struct notifier_block *nb) | |
384 | { | |
3fdb14fd | 385 | struct timekeeper *tk = &tk_core.timekeeper; |
e0b306fe MT |
386 | unsigned long flags; |
387 | int ret; | |
388 | ||
9a7a71b1 | 389 | raw_spin_lock_irqsave(&timekeeper_lock, flags); |
e0b306fe | 390 | ret = raw_notifier_chain_register(&pvclock_gtod_chain, nb); |
780427f0 | 391 | update_pvclock_gtod(tk, true); |
9a7a71b1 | 392 | raw_spin_unlock_irqrestore(&timekeeper_lock, flags); |
e0b306fe MT |
393 | |
394 | return ret; | |
395 | } | |
396 | EXPORT_SYMBOL_GPL(pvclock_gtod_register_notifier); | |
397 | ||
398 | /** | |
399 | * pvclock_gtod_unregister_notifier - unregister a pvclock | |
400 | * timedata update listener | |
e0b306fe MT |
401 | */ |
402 | int pvclock_gtod_unregister_notifier(struct notifier_block *nb) | |
403 | { | |
e0b306fe MT |
404 | unsigned long flags; |
405 | int ret; | |
406 | ||
9a7a71b1 | 407 | raw_spin_lock_irqsave(&timekeeper_lock, flags); |
e0b306fe | 408 | ret = raw_notifier_chain_unregister(&pvclock_gtod_chain, nb); |
9a7a71b1 | 409 | raw_spin_unlock_irqrestore(&timekeeper_lock, flags); |
e0b306fe MT |
410 | |
411 | return ret; | |
412 | } | |
413 | EXPORT_SYMBOL_GPL(pvclock_gtod_unregister_notifier); | |
414 | ||
7c032df5 TG |
415 | /* |
416 | * Update the ktime_t based scalar nsec members of the timekeeper | |
417 | */ | |
418 | static inline void tk_update_ktime_data(struct timekeeper *tk) | |
419 | { | |
9e3680b1 HS |
420 | u64 seconds; |
421 | u32 nsec; | |
7c032df5 TG |
422 | |
423 | /* | |
424 | * The xtime based monotonic readout is: | |
425 | * nsec = (xtime_sec + wtm_sec) * 1e9 + wtm_nsec + now(); | |
426 | * The ktime based monotonic readout is: | |
427 | * nsec = base_mono + now(); | |
428 | * ==> base_mono = (xtime_sec + wtm_sec) * 1e9 + wtm_nsec | |
429 | */ | |
9e3680b1 HS |
430 | seconds = (u64)(tk->xtime_sec + tk->wall_to_monotonic.tv_sec); |
431 | nsec = (u32) tk->wall_to_monotonic.tv_nsec; | |
432 | tk->tkr.base_mono = ns_to_ktime(seconds * NSEC_PER_SEC + nsec); | |
f519b1a2 TG |
433 | |
434 | /* Update the monotonic raw base */ | |
435 | tk->base_raw = timespec64_to_ktime(tk->raw_time); | |
9e3680b1 HS |
436 | |
437 | /* | |
438 | * The sum of the nanoseconds portions of xtime and | |
439 | * wall_to_monotonic can be greater/equal one second. Take | |
440 | * this into account before updating tk->ktime_sec. | |
441 | */ | |
442 | nsec += (u32)(tk->tkr.xtime_nsec >> tk->tkr.shift); | |
443 | if (nsec >= NSEC_PER_SEC) | |
444 | seconds++; | |
445 | tk->ktime_sec = seconds; | |
7c032df5 TG |
446 | } |
447 | ||
9a7a71b1 | 448 | /* must hold timekeeper_lock */ |
04397fe9 | 449 | static void timekeeping_update(struct timekeeper *tk, unsigned int action) |
cc06268c | 450 | { |
04397fe9 | 451 | if (action & TK_CLEAR_NTP) { |
f726a697 | 452 | tk->ntp_error = 0; |
cc06268c TG |
453 | ntp_clear(); |
454 | } | |
48cdc135 | 455 | |
7c032df5 TG |
456 | tk_update_ktime_data(tk); |
457 | ||
9bf2419f TG |
458 | update_vsyscall(tk); |
459 | update_pvclock_gtod(tk, action & TK_CLOCK_WAS_SET); | |
460 | ||
04397fe9 | 461 | if (action & TK_MIRROR) |
3fdb14fd TG |
462 | memcpy(&shadow_timekeeper, &tk_core.timekeeper, |
463 | sizeof(tk_core.timekeeper)); | |
4396e058 TG |
464 | |
465 | update_fast_timekeeper(tk); | |
cc06268c TG |
466 | } |
467 | ||
8524070b | 468 | /** |
155ec602 | 469 | * timekeeping_forward_now - update clock to the current time |
8524070b | 470 | * |
9a055117 RZ |
471 | * Forward the current clock to update its state since the last call to |
472 | * update_wall_time(). This is useful before significant clock changes, | |
473 | * as it avoids having to deal with this time offset explicitly. | |
8524070b | 474 | */ |
f726a697 | 475 | static void timekeeping_forward_now(struct timekeeper *tk) |
8524070b | 476 | { |
d28ede83 | 477 | struct clocksource *clock = tk->tkr.clock; |
3a978377 | 478 | cycle_t cycle_now, delta; |
9a055117 | 479 | s64 nsec; |
8524070b | 480 | |
d28ede83 TG |
481 | cycle_now = tk->tkr.read(clock); |
482 | delta = clocksource_delta(cycle_now, tk->tkr.cycle_last, tk->tkr.mask); | |
483 | tk->tkr.cycle_last = cycle_now; | |
8524070b | 484 | |
d28ede83 | 485 | tk->tkr.xtime_nsec += delta * tk->tkr.mult; |
7d27558c | 486 | |
7b1f6207 | 487 | /* If arch requires, add in get_arch_timeoffset() */ |
d28ede83 | 488 | tk->tkr.xtime_nsec += (u64)arch_gettimeoffset() << tk->tkr.shift; |
7d27558c | 489 | |
f726a697 | 490 | tk_normalize_xtime(tk); |
2d42244a | 491 | |
3a978377 | 492 | nsec = clocksource_cyc2ns(delta, clock->mult, clock->shift); |
7d489d15 | 493 | timespec64_add_ns(&tk->raw_time, nsec); |
8524070b | 494 | } |
495 | ||
496 | /** | |
d6d29896 | 497 | * __getnstimeofday64 - Returns the time of day in a timespec64. |
8524070b | 498 | * @ts: pointer to the timespec to be set |
499 | * | |
1e817fb6 KC |
500 | * Updates the time of day in the timespec. |
501 | * Returns 0 on success, or -ve when suspended (timespec will be undefined). | |
8524070b | 502 | */ |
d6d29896 | 503 | int __getnstimeofday64(struct timespec64 *ts) |
8524070b | 504 | { |
3fdb14fd | 505 | struct timekeeper *tk = &tk_core.timekeeper; |
8524070b | 506 | unsigned long seq; |
1e75fa8b | 507 | s64 nsecs = 0; |
8524070b | 508 | |
509 | do { | |
3fdb14fd | 510 | seq = read_seqcount_begin(&tk_core.seq); |
8524070b | 511 | |
4e250fdd | 512 | ts->tv_sec = tk->xtime_sec; |
0e5ac3a8 | 513 | nsecs = timekeeping_get_ns(&tk->tkr); |
8524070b | 514 | |
3fdb14fd | 515 | } while (read_seqcount_retry(&tk_core.seq, seq)); |
8524070b | 516 | |
ec145bab | 517 | ts->tv_nsec = 0; |
d6d29896 | 518 | timespec64_add_ns(ts, nsecs); |
1e817fb6 KC |
519 | |
520 | /* | |
521 | * Do not bail out early, in case there were callers still using | |
522 | * the value, even in the face of the WARN_ON. | |
523 | */ | |
524 | if (unlikely(timekeeping_suspended)) | |
525 | return -EAGAIN; | |
526 | return 0; | |
527 | } | |
d6d29896 | 528 | EXPORT_SYMBOL(__getnstimeofday64); |
1e817fb6 KC |
529 | |
530 | /** | |
d6d29896 | 531 | * getnstimeofday64 - Returns the time of day in a timespec64. |
5322e4c2 | 532 | * @ts: pointer to the timespec64 to be set |
1e817fb6 | 533 | * |
5322e4c2 | 534 | * Returns the time of day in a timespec64 (WARN if suspended). |
1e817fb6 | 535 | */ |
d6d29896 | 536 | void getnstimeofday64(struct timespec64 *ts) |
1e817fb6 | 537 | { |
d6d29896 | 538 | WARN_ON(__getnstimeofday64(ts)); |
8524070b | 539 | } |
d6d29896 | 540 | EXPORT_SYMBOL(getnstimeofday64); |
8524070b | 541 | |
951ed4d3 MS |
542 | ktime_t ktime_get(void) |
543 | { | |
3fdb14fd | 544 | struct timekeeper *tk = &tk_core.timekeeper; |
951ed4d3 | 545 | unsigned int seq; |
a016a5bd TG |
546 | ktime_t base; |
547 | s64 nsecs; | |
951ed4d3 MS |
548 | |
549 | WARN_ON(timekeeping_suspended); | |
550 | ||
551 | do { | |
3fdb14fd | 552 | seq = read_seqcount_begin(&tk_core.seq); |
d28ede83 | 553 | base = tk->tkr.base_mono; |
0e5ac3a8 | 554 | nsecs = timekeeping_get_ns(&tk->tkr); |
951ed4d3 | 555 | |
3fdb14fd | 556 | } while (read_seqcount_retry(&tk_core.seq, seq)); |
24e4a8c3 | 557 | |
a016a5bd | 558 | return ktime_add_ns(base, nsecs); |
951ed4d3 MS |
559 | } |
560 | EXPORT_SYMBOL_GPL(ktime_get); | |
561 | ||
0077dc60 TG |
562 | static ktime_t *offsets[TK_OFFS_MAX] = { |
563 | [TK_OFFS_REAL] = &tk_core.timekeeper.offs_real, | |
564 | [TK_OFFS_BOOT] = &tk_core.timekeeper.offs_boot, | |
565 | [TK_OFFS_TAI] = &tk_core.timekeeper.offs_tai, | |
566 | }; | |
567 | ||
568 | ktime_t ktime_get_with_offset(enum tk_offsets offs) | |
569 | { | |
570 | struct timekeeper *tk = &tk_core.timekeeper; | |
571 | unsigned int seq; | |
572 | ktime_t base, *offset = offsets[offs]; | |
573 | s64 nsecs; | |
574 | ||
575 | WARN_ON(timekeeping_suspended); | |
576 | ||
577 | do { | |
578 | seq = read_seqcount_begin(&tk_core.seq); | |
d28ede83 | 579 | base = ktime_add(tk->tkr.base_mono, *offset); |
0e5ac3a8 | 580 | nsecs = timekeeping_get_ns(&tk->tkr); |
0077dc60 TG |
581 | |
582 | } while (read_seqcount_retry(&tk_core.seq, seq)); | |
583 | ||
584 | return ktime_add_ns(base, nsecs); | |
585 | ||
586 | } | |
587 | EXPORT_SYMBOL_GPL(ktime_get_with_offset); | |
588 | ||
9a6b5197 TG |
589 | /** |
590 | * ktime_mono_to_any() - convert mononotic time to any other time | |
591 | * @tmono: time to convert. | |
592 | * @offs: which offset to use | |
593 | */ | |
594 | ktime_t ktime_mono_to_any(ktime_t tmono, enum tk_offsets offs) | |
595 | { | |
596 | ktime_t *offset = offsets[offs]; | |
597 | unsigned long seq; | |
598 | ktime_t tconv; | |
599 | ||
600 | do { | |
601 | seq = read_seqcount_begin(&tk_core.seq); | |
602 | tconv = ktime_add(tmono, *offset); | |
603 | } while (read_seqcount_retry(&tk_core.seq, seq)); | |
604 | ||
605 | return tconv; | |
606 | } | |
607 | EXPORT_SYMBOL_GPL(ktime_mono_to_any); | |
608 | ||
f519b1a2 TG |
609 | /** |
610 | * ktime_get_raw - Returns the raw monotonic time in ktime_t format | |
611 | */ | |
612 | ktime_t ktime_get_raw(void) | |
613 | { | |
614 | struct timekeeper *tk = &tk_core.timekeeper; | |
615 | unsigned int seq; | |
616 | ktime_t base; | |
617 | s64 nsecs; | |
618 | ||
619 | do { | |
620 | seq = read_seqcount_begin(&tk_core.seq); | |
621 | base = tk->base_raw; | |
622 | nsecs = timekeeping_get_ns_raw(tk); | |
623 | ||
624 | } while (read_seqcount_retry(&tk_core.seq, seq)); | |
625 | ||
626 | return ktime_add_ns(base, nsecs); | |
627 | } | |
628 | EXPORT_SYMBOL_GPL(ktime_get_raw); | |
629 | ||
951ed4d3 | 630 | /** |
d6d29896 | 631 | * ktime_get_ts64 - get the monotonic clock in timespec64 format |
951ed4d3 MS |
632 | * @ts: pointer to timespec variable |
633 | * | |
634 | * The function calculates the monotonic clock from the realtime | |
635 | * clock and the wall_to_monotonic offset and stores the result | |
5322e4c2 | 636 | * in normalized timespec64 format in the variable pointed to by @ts. |
951ed4d3 | 637 | */ |
d6d29896 | 638 | void ktime_get_ts64(struct timespec64 *ts) |
951ed4d3 | 639 | { |
3fdb14fd | 640 | struct timekeeper *tk = &tk_core.timekeeper; |
d6d29896 | 641 | struct timespec64 tomono; |
ec145bab | 642 | s64 nsec; |
951ed4d3 | 643 | unsigned int seq; |
951ed4d3 MS |
644 | |
645 | WARN_ON(timekeeping_suspended); | |
646 | ||
647 | do { | |
3fdb14fd | 648 | seq = read_seqcount_begin(&tk_core.seq); |
d6d29896 | 649 | ts->tv_sec = tk->xtime_sec; |
0e5ac3a8 | 650 | nsec = timekeeping_get_ns(&tk->tkr); |
4e250fdd | 651 | tomono = tk->wall_to_monotonic; |
951ed4d3 | 652 | |
3fdb14fd | 653 | } while (read_seqcount_retry(&tk_core.seq, seq)); |
951ed4d3 | 654 | |
d6d29896 TG |
655 | ts->tv_sec += tomono.tv_sec; |
656 | ts->tv_nsec = 0; | |
657 | timespec64_add_ns(ts, nsec + tomono.tv_nsec); | |
951ed4d3 | 658 | } |
d6d29896 | 659 | EXPORT_SYMBOL_GPL(ktime_get_ts64); |
951ed4d3 | 660 | |
9e3680b1 HS |
661 | /** |
662 | * ktime_get_seconds - Get the seconds portion of CLOCK_MONOTONIC | |
663 | * | |
664 | * Returns the seconds portion of CLOCK_MONOTONIC with a single non | |
665 | * serialized read. tk->ktime_sec is of type 'unsigned long' so this | |
666 | * works on both 32 and 64 bit systems. On 32 bit systems the readout | |
667 | * covers ~136 years of uptime which should be enough to prevent | |
668 | * premature wrap arounds. | |
669 | */ | |
670 | time64_t ktime_get_seconds(void) | |
671 | { | |
672 | struct timekeeper *tk = &tk_core.timekeeper; | |
673 | ||
674 | WARN_ON(timekeeping_suspended); | |
675 | return tk->ktime_sec; | |
676 | } | |
677 | EXPORT_SYMBOL_GPL(ktime_get_seconds); | |
678 | ||
dbe7aa62 HS |
679 | /** |
680 | * ktime_get_real_seconds - Get the seconds portion of CLOCK_REALTIME | |
681 | * | |
682 | * Returns the wall clock seconds since 1970. This replaces the | |
683 | * get_seconds() interface which is not y2038 safe on 32bit systems. | |
684 | * | |
685 | * For 64bit systems the fast access to tk->xtime_sec is preserved. On | |
686 | * 32bit systems the access must be protected with the sequence | |
687 | * counter to provide "atomic" access to the 64bit tk->xtime_sec | |
688 | * value. | |
689 | */ | |
690 | time64_t ktime_get_real_seconds(void) | |
691 | { | |
692 | struct timekeeper *tk = &tk_core.timekeeper; | |
693 | time64_t seconds; | |
694 | unsigned int seq; | |
695 | ||
696 | if (IS_ENABLED(CONFIG_64BIT)) | |
697 | return tk->xtime_sec; | |
698 | ||
699 | do { | |
700 | seq = read_seqcount_begin(&tk_core.seq); | |
701 | seconds = tk->xtime_sec; | |
702 | ||
703 | } while (read_seqcount_retry(&tk_core.seq, seq)); | |
704 | ||
705 | return seconds; | |
706 | } | |
707 | EXPORT_SYMBOL_GPL(ktime_get_real_seconds); | |
708 | ||
e2c18e49 AG |
709 | #ifdef CONFIG_NTP_PPS |
710 | ||
711 | /** | |
712 | * getnstime_raw_and_real - get day and raw monotonic time in timespec format | |
713 | * @ts_raw: pointer to the timespec to be set to raw monotonic time | |
714 | * @ts_real: pointer to the timespec to be set to the time of day | |
715 | * | |
716 | * This function reads both the time of day and raw monotonic time at the | |
717 | * same time atomically and stores the resulting timestamps in timespec | |
718 | * format. | |
719 | */ | |
720 | void getnstime_raw_and_real(struct timespec *ts_raw, struct timespec *ts_real) | |
721 | { | |
3fdb14fd | 722 | struct timekeeper *tk = &tk_core.timekeeper; |
e2c18e49 AG |
723 | unsigned long seq; |
724 | s64 nsecs_raw, nsecs_real; | |
725 | ||
726 | WARN_ON_ONCE(timekeeping_suspended); | |
727 | ||
728 | do { | |
3fdb14fd | 729 | seq = read_seqcount_begin(&tk_core.seq); |
e2c18e49 | 730 | |
7d489d15 | 731 | *ts_raw = timespec64_to_timespec(tk->raw_time); |
4e250fdd | 732 | ts_real->tv_sec = tk->xtime_sec; |
1e75fa8b | 733 | ts_real->tv_nsec = 0; |
e2c18e49 | 734 | |
4e250fdd | 735 | nsecs_raw = timekeeping_get_ns_raw(tk); |
0e5ac3a8 | 736 | nsecs_real = timekeeping_get_ns(&tk->tkr); |
e2c18e49 | 737 | |
3fdb14fd | 738 | } while (read_seqcount_retry(&tk_core.seq, seq)); |
e2c18e49 AG |
739 | |
740 | timespec_add_ns(ts_raw, nsecs_raw); | |
741 | timespec_add_ns(ts_real, nsecs_real); | |
742 | } | |
743 | EXPORT_SYMBOL(getnstime_raw_and_real); | |
744 | ||
745 | #endif /* CONFIG_NTP_PPS */ | |
746 | ||
8524070b | 747 | /** |
748 | * do_gettimeofday - Returns the time of day in a timeval | |
749 | * @tv: pointer to the timeval to be set | |
750 | * | |
efd9ac86 | 751 | * NOTE: Users should be converted to using getnstimeofday() |
8524070b | 752 | */ |
753 | void do_gettimeofday(struct timeval *tv) | |
754 | { | |
d6d29896 | 755 | struct timespec64 now; |
8524070b | 756 | |
d6d29896 | 757 | getnstimeofday64(&now); |
8524070b | 758 | tv->tv_sec = now.tv_sec; |
759 | tv->tv_usec = now.tv_nsec/1000; | |
760 | } | |
8524070b | 761 | EXPORT_SYMBOL(do_gettimeofday); |
d239f49d | 762 | |
8524070b | 763 | /** |
21f7eca5 | 764 | * do_settimeofday64 - Sets the time of day. |
765 | * @ts: pointer to the timespec64 variable containing the new time | |
8524070b | 766 | * |
767 | * Sets the time of day to the new time and update NTP and notify hrtimers | |
768 | */ | |
21f7eca5 | 769 | int do_settimeofday64(const struct timespec64 *ts) |
8524070b | 770 | { |
3fdb14fd | 771 | struct timekeeper *tk = &tk_core.timekeeper; |
21f7eca5 | 772 | struct timespec64 ts_delta, xt; |
92c1d3ed | 773 | unsigned long flags; |
8524070b | 774 | |
21f7eca5 | 775 | if (!timespec64_valid_strict(ts)) |
8524070b | 776 | return -EINVAL; |
777 | ||
9a7a71b1 | 778 | raw_spin_lock_irqsave(&timekeeper_lock, flags); |
3fdb14fd | 779 | write_seqcount_begin(&tk_core.seq); |
8524070b | 780 | |
4e250fdd | 781 | timekeeping_forward_now(tk); |
9a055117 | 782 | |
4e250fdd | 783 | xt = tk_xtime(tk); |
21f7eca5 | 784 | ts_delta.tv_sec = ts->tv_sec - xt.tv_sec; |
785 | ts_delta.tv_nsec = ts->tv_nsec - xt.tv_nsec; | |
1e75fa8b | 786 | |
7d489d15 | 787 | tk_set_wall_to_mono(tk, timespec64_sub(tk->wall_to_monotonic, ts_delta)); |
8524070b | 788 | |
21f7eca5 | 789 | tk_set_xtime(tk, ts); |
1e75fa8b | 790 | |
780427f0 | 791 | timekeeping_update(tk, TK_CLEAR_NTP | TK_MIRROR | TK_CLOCK_WAS_SET); |
8524070b | 792 | |
3fdb14fd | 793 | write_seqcount_end(&tk_core.seq); |
9a7a71b1 | 794 | raw_spin_unlock_irqrestore(&timekeeper_lock, flags); |
8524070b | 795 | |
796 | /* signal hrtimers about time change */ | |
797 | clock_was_set(); | |
798 | ||
799 | return 0; | |
800 | } | |
21f7eca5 | 801 | EXPORT_SYMBOL(do_settimeofday64); |
8524070b | 802 | |
c528f7c6 JS |
803 | /** |
804 | * timekeeping_inject_offset - Adds or subtracts from the current time. | |
805 | * @tv: pointer to the timespec variable containing the offset | |
806 | * | |
807 | * Adds or subtracts an offset value from the current time. | |
808 | */ | |
809 | int timekeeping_inject_offset(struct timespec *ts) | |
810 | { | |
3fdb14fd | 811 | struct timekeeper *tk = &tk_core.timekeeper; |
92c1d3ed | 812 | unsigned long flags; |
7d489d15 | 813 | struct timespec64 ts64, tmp; |
4e8b1452 | 814 | int ret = 0; |
c528f7c6 JS |
815 | |
816 | if ((unsigned long)ts->tv_nsec >= NSEC_PER_SEC) | |
817 | return -EINVAL; | |
818 | ||
7d489d15 JS |
819 | ts64 = timespec_to_timespec64(*ts); |
820 | ||
9a7a71b1 | 821 | raw_spin_lock_irqsave(&timekeeper_lock, flags); |
3fdb14fd | 822 | write_seqcount_begin(&tk_core.seq); |
c528f7c6 | 823 | |
4e250fdd | 824 | timekeeping_forward_now(tk); |
c528f7c6 | 825 | |
4e8b1452 | 826 | /* Make sure the proposed value is valid */ |
7d489d15 JS |
827 | tmp = timespec64_add(tk_xtime(tk), ts64); |
828 | if (!timespec64_valid_strict(&tmp)) { | |
4e8b1452 JS |
829 | ret = -EINVAL; |
830 | goto error; | |
831 | } | |
1e75fa8b | 832 | |
7d489d15 JS |
833 | tk_xtime_add(tk, &ts64); |
834 | tk_set_wall_to_mono(tk, timespec64_sub(tk->wall_to_monotonic, ts64)); | |
c528f7c6 | 835 | |
4e8b1452 | 836 | error: /* even if we error out, we forwarded the time, so call update */ |
780427f0 | 837 | timekeeping_update(tk, TK_CLEAR_NTP | TK_MIRROR | TK_CLOCK_WAS_SET); |
c528f7c6 | 838 | |
3fdb14fd | 839 | write_seqcount_end(&tk_core.seq); |
9a7a71b1 | 840 | raw_spin_unlock_irqrestore(&timekeeper_lock, flags); |
c528f7c6 JS |
841 | |
842 | /* signal hrtimers about time change */ | |
843 | clock_was_set(); | |
844 | ||
4e8b1452 | 845 | return ret; |
c528f7c6 JS |
846 | } |
847 | EXPORT_SYMBOL(timekeeping_inject_offset); | |
848 | ||
cc244dda JS |
849 | |
850 | /** | |
851 | * timekeeping_get_tai_offset - Returns current TAI offset from UTC | |
852 | * | |
853 | */ | |
854 | s32 timekeeping_get_tai_offset(void) | |
855 | { | |
3fdb14fd | 856 | struct timekeeper *tk = &tk_core.timekeeper; |
cc244dda JS |
857 | unsigned int seq; |
858 | s32 ret; | |
859 | ||
860 | do { | |
3fdb14fd | 861 | seq = read_seqcount_begin(&tk_core.seq); |
cc244dda | 862 | ret = tk->tai_offset; |
3fdb14fd | 863 | } while (read_seqcount_retry(&tk_core.seq, seq)); |
cc244dda JS |
864 | |
865 | return ret; | |
866 | } | |
867 | ||
868 | /** | |
869 | * __timekeeping_set_tai_offset - Lock free worker function | |
870 | * | |
871 | */ | |
dd5d70e8 | 872 | static void __timekeeping_set_tai_offset(struct timekeeper *tk, s32 tai_offset) |
cc244dda JS |
873 | { |
874 | tk->tai_offset = tai_offset; | |
04005f60 | 875 | tk->offs_tai = ktime_add(tk->offs_real, ktime_set(tai_offset, 0)); |
cc244dda JS |
876 | } |
877 | ||
878 | /** | |
879 | * timekeeping_set_tai_offset - Sets the current TAI offset from UTC | |
880 | * | |
881 | */ | |
882 | void timekeeping_set_tai_offset(s32 tai_offset) | |
883 | { | |
3fdb14fd | 884 | struct timekeeper *tk = &tk_core.timekeeper; |
cc244dda JS |
885 | unsigned long flags; |
886 | ||
9a7a71b1 | 887 | raw_spin_lock_irqsave(&timekeeper_lock, flags); |
3fdb14fd | 888 | write_seqcount_begin(&tk_core.seq); |
cc244dda | 889 | __timekeeping_set_tai_offset(tk, tai_offset); |
f55c0760 | 890 | timekeeping_update(tk, TK_MIRROR | TK_CLOCK_WAS_SET); |
3fdb14fd | 891 | write_seqcount_end(&tk_core.seq); |
9a7a71b1 | 892 | raw_spin_unlock_irqrestore(&timekeeper_lock, flags); |
4e8f8b34 | 893 | clock_was_set(); |
cc244dda JS |
894 | } |
895 | ||
8524070b | 896 | /** |
897 | * change_clocksource - Swaps clocksources if a new one is available | |
898 | * | |
899 | * Accumulates current time interval and initializes new clocksource | |
900 | */ | |
75c5158f | 901 | static int change_clocksource(void *data) |
8524070b | 902 | { |
3fdb14fd | 903 | struct timekeeper *tk = &tk_core.timekeeper; |
4614e6ad | 904 | struct clocksource *new, *old; |
f695cf94 | 905 | unsigned long flags; |
8524070b | 906 | |
75c5158f | 907 | new = (struct clocksource *) data; |
8524070b | 908 | |
9a7a71b1 | 909 | raw_spin_lock_irqsave(&timekeeper_lock, flags); |
3fdb14fd | 910 | write_seqcount_begin(&tk_core.seq); |
f695cf94 | 911 | |
4e250fdd | 912 | timekeeping_forward_now(tk); |
09ac369c TG |
913 | /* |
914 | * If the cs is in module, get a module reference. Succeeds | |
915 | * for built-in code (owner == NULL) as well. | |
916 | */ | |
917 | if (try_module_get(new->owner)) { | |
918 | if (!new->enable || new->enable(new) == 0) { | |
d28ede83 | 919 | old = tk->tkr.clock; |
09ac369c TG |
920 | tk_setup_internals(tk, new); |
921 | if (old->disable) | |
922 | old->disable(old); | |
923 | module_put(old->owner); | |
924 | } else { | |
925 | module_put(new->owner); | |
926 | } | |
75c5158f | 927 | } |
780427f0 | 928 | timekeeping_update(tk, TK_CLEAR_NTP | TK_MIRROR | TK_CLOCK_WAS_SET); |
f695cf94 | 929 | |
3fdb14fd | 930 | write_seqcount_end(&tk_core.seq); |
9a7a71b1 | 931 | raw_spin_unlock_irqrestore(&timekeeper_lock, flags); |
f695cf94 | 932 | |
75c5158f MS |
933 | return 0; |
934 | } | |
8524070b | 935 | |
75c5158f MS |
936 | /** |
937 | * timekeeping_notify - Install a new clock source | |
938 | * @clock: pointer to the clock source | |
939 | * | |
940 | * This function is called from clocksource.c after a new, better clock | |
941 | * source has been registered. The caller holds the clocksource_mutex. | |
942 | */ | |
ba919d1c | 943 | int timekeeping_notify(struct clocksource *clock) |
75c5158f | 944 | { |
3fdb14fd | 945 | struct timekeeper *tk = &tk_core.timekeeper; |
4e250fdd | 946 | |
d28ede83 | 947 | if (tk->tkr.clock == clock) |
ba919d1c | 948 | return 0; |
75c5158f | 949 | stop_machine(change_clocksource, clock, NULL); |
8524070b | 950 | tick_clock_notify(); |
d28ede83 | 951 | return tk->tkr.clock == clock ? 0 : -1; |
8524070b | 952 | } |
75c5158f | 953 | |
2d42244a | 954 | /** |
cdba2ec5 JS |
955 | * getrawmonotonic64 - Returns the raw monotonic time in a timespec |
956 | * @ts: pointer to the timespec64 to be set | |
2d42244a JS |
957 | * |
958 | * Returns the raw monotonic time (completely un-modified by ntp) | |
959 | */ | |
cdba2ec5 | 960 | void getrawmonotonic64(struct timespec64 *ts) |
2d42244a | 961 | { |
3fdb14fd | 962 | struct timekeeper *tk = &tk_core.timekeeper; |
7d489d15 | 963 | struct timespec64 ts64; |
2d42244a JS |
964 | unsigned long seq; |
965 | s64 nsecs; | |
2d42244a JS |
966 | |
967 | do { | |
3fdb14fd | 968 | seq = read_seqcount_begin(&tk_core.seq); |
4e250fdd | 969 | nsecs = timekeeping_get_ns_raw(tk); |
7d489d15 | 970 | ts64 = tk->raw_time; |
2d42244a | 971 | |
3fdb14fd | 972 | } while (read_seqcount_retry(&tk_core.seq, seq)); |
2d42244a | 973 | |
7d489d15 | 974 | timespec64_add_ns(&ts64, nsecs); |
cdba2ec5 | 975 | *ts = ts64; |
2d42244a | 976 | } |
cdba2ec5 JS |
977 | EXPORT_SYMBOL(getrawmonotonic64); |
978 | ||
2d42244a | 979 | |
8524070b | 980 | /** |
cf4fc6cb | 981 | * timekeeping_valid_for_hres - Check if timekeeping is suitable for hres |
8524070b | 982 | */ |
cf4fc6cb | 983 | int timekeeping_valid_for_hres(void) |
8524070b | 984 | { |
3fdb14fd | 985 | struct timekeeper *tk = &tk_core.timekeeper; |
8524070b | 986 | unsigned long seq; |
987 | int ret; | |
988 | ||
989 | do { | |
3fdb14fd | 990 | seq = read_seqcount_begin(&tk_core.seq); |
8524070b | 991 | |
d28ede83 | 992 | ret = tk->tkr.clock->flags & CLOCK_SOURCE_VALID_FOR_HRES; |
8524070b | 993 | |
3fdb14fd | 994 | } while (read_seqcount_retry(&tk_core.seq, seq)); |
8524070b | 995 | |
996 | return ret; | |
997 | } | |
998 | ||
98962465 JH |
999 | /** |
1000 | * timekeeping_max_deferment - Returns max time the clocksource can be deferred | |
98962465 JH |
1001 | */ |
1002 | u64 timekeeping_max_deferment(void) | |
1003 | { | |
3fdb14fd | 1004 | struct timekeeper *tk = &tk_core.timekeeper; |
70471f2f JS |
1005 | unsigned long seq; |
1006 | u64 ret; | |
42e71e81 | 1007 | |
70471f2f | 1008 | do { |
3fdb14fd | 1009 | seq = read_seqcount_begin(&tk_core.seq); |
70471f2f | 1010 | |
d28ede83 | 1011 | ret = tk->tkr.clock->max_idle_ns; |
70471f2f | 1012 | |
3fdb14fd | 1013 | } while (read_seqcount_retry(&tk_core.seq, seq)); |
70471f2f JS |
1014 | |
1015 | return ret; | |
98962465 JH |
1016 | } |
1017 | ||
8524070b | 1018 | /** |
d4f587c6 | 1019 | * read_persistent_clock - Return time from the persistent clock. |
8524070b | 1020 | * |
1021 | * Weak dummy function for arches that do not yet support it. | |
d4f587c6 MS |
1022 | * Reads the time from the battery backed persistent clock. |
1023 | * Returns a timespec with tv_sec=0 and tv_nsec=0 if unsupported. | |
8524070b | 1024 | * |
1025 | * XXX - Do be sure to remove it once all arches implement it. | |
1026 | */ | |
52f5684c | 1027 | void __weak read_persistent_clock(struct timespec *ts) |
8524070b | 1028 | { |
d4f587c6 MS |
1029 | ts->tv_sec = 0; |
1030 | ts->tv_nsec = 0; | |
8524070b | 1031 | } |
1032 | ||
23970e38 MS |
1033 | /** |
1034 | * read_boot_clock - Return time of the system start. | |
1035 | * | |
1036 | * Weak dummy function for arches that do not yet support it. | |
1037 | * Function to read the exact time the system has been started. | |
1038 | * Returns a timespec with tv_sec=0 and tv_nsec=0 if unsupported. | |
1039 | * | |
1040 | * XXX - Do be sure to remove it once all arches implement it. | |
1041 | */ | |
52f5684c | 1042 | void __weak read_boot_clock(struct timespec *ts) |
23970e38 MS |
1043 | { |
1044 | ts->tv_sec = 0; | |
1045 | ts->tv_nsec = 0; | |
1046 | } | |
1047 | ||
8524070b | 1048 | /* |
1049 | * timekeeping_init - Initializes the clocksource and common timekeeping values | |
1050 | */ | |
1051 | void __init timekeeping_init(void) | |
1052 | { | |
3fdb14fd | 1053 | struct timekeeper *tk = &tk_core.timekeeper; |
155ec602 | 1054 | struct clocksource *clock; |
8524070b | 1055 | unsigned long flags; |
7d489d15 JS |
1056 | struct timespec64 now, boot, tmp; |
1057 | struct timespec ts; | |
31ade306 | 1058 | |
7d489d15 JS |
1059 | read_persistent_clock(&ts); |
1060 | now = timespec_to_timespec64(ts); | |
1061 | if (!timespec64_valid_strict(&now)) { | |
4e8b1452 JS |
1062 | pr_warn("WARNING: Persistent clock returned invalid value!\n" |
1063 | " Check your CMOS/BIOS settings.\n"); | |
1064 | now.tv_sec = 0; | |
1065 | now.tv_nsec = 0; | |
31ade306 FT |
1066 | } else if (now.tv_sec || now.tv_nsec) |
1067 | persistent_clock_exist = true; | |
4e8b1452 | 1068 | |
7d489d15 JS |
1069 | read_boot_clock(&ts); |
1070 | boot = timespec_to_timespec64(ts); | |
1071 | if (!timespec64_valid_strict(&boot)) { | |
4e8b1452 JS |
1072 | pr_warn("WARNING: Boot clock returned invalid value!\n" |
1073 | " Check your CMOS/BIOS settings.\n"); | |
1074 | boot.tv_sec = 0; | |
1075 | boot.tv_nsec = 0; | |
1076 | } | |
8524070b | 1077 | |
9a7a71b1 | 1078 | raw_spin_lock_irqsave(&timekeeper_lock, flags); |
3fdb14fd | 1079 | write_seqcount_begin(&tk_core.seq); |
06c017fd JS |
1080 | ntp_init(); |
1081 | ||
f1b82746 | 1082 | clock = clocksource_default_clock(); |
a0f7d48b MS |
1083 | if (clock->enable) |
1084 | clock->enable(clock); | |
4e250fdd | 1085 | tk_setup_internals(tk, clock); |
8524070b | 1086 | |
4e250fdd JS |
1087 | tk_set_xtime(tk, &now); |
1088 | tk->raw_time.tv_sec = 0; | |
1089 | tk->raw_time.tv_nsec = 0; | |
f519b1a2 | 1090 | tk->base_raw.tv64 = 0; |
1e75fa8b | 1091 | if (boot.tv_sec == 0 && boot.tv_nsec == 0) |
4e250fdd | 1092 | boot = tk_xtime(tk); |
1e75fa8b | 1093 | |
7d489d15 | 1094 | set_normalized_timespec64(&tmp, -boot.tv_sec, -boot.tv_nsec); |
4e250fdd | 1095 | tk_set_wall_to_mono(tk, tmp); |
6d0ef903 | 1096 | |
f111adfd | 1097 | timekeeping_update(tk, TK_MIRROR); |
48cdc135 | 1098 | |
3fdb14fd | 1099 | write_seqcount_end(&tk_core.seq); |
9a7a71b1 | 1100 | raw_spin_unlock_irqrestore(&timekeeper_lock, flags); |
8524070b | 1101 | } |
1102 | ||
8524070b | 1103 | /* time in seconds when suspend began */ |
7d489d15 | 1104 | static struct timespec64 timekeeping_suspend_time; |
8524070b | 1105 | |
304529b1 JS |
1106 | /** |
1107 | * __timekeeping_inject_sleeptime - Internal function to add sleep interval | |
1108 | * @delta: pointer to a timespec delta value | |
1109 | * | |
1110 | * Takes a timespec offset measuring a suspend interval and properly | |
1111 | * adds the sleep offset to the timekeeping variables. | |
1112 | */ | |
f726a697 | 1113 | static void __timekeeping_inject_sleeptime(struct timekeeper *tk, |
7d489d15 | 1114 | struct timespec64 *delta) |
304529b1 | 1115 | { |
7d489d15 | 1116 | if (!timespec64_valid_strict(delta)) { |
6d9bcb62 JS |
1117 | printk_deferred(KERN_WARNING |
1118 | "__timekeeping_inject_sleeptime: Invalid " | |
1119 | "sleep delta value!\n"); | |
cb5de2f8 JS |
1120 | return; |
1121 | } | |
f726a697 | 1122 | tk_xtime_add(tk, delta); |
7d489d15 | 1123 | tk_set_wall_to_mono(tk, timespec64_sub(tk->wall_to_monotonic, *delta)); |
47da70d3 | 1124 | tk_update_sleep_time(tk, timespec64_to_ktime(*delta)); |
5c83545f | 1125 | tk_debug_account_sleep_time(delta); |
304529b1 JS |
1126 | } |
1127 | ||
304529b1 | 1128 | /** |
04d90890 | 1129 | * timekeeping_inject_sleeptime64 - Adds suspend interval to timeekeeping values |
1130 | * @delta: pointer to a timespec64 delta value | |
304529b1 JS |
1131 | * |
1132 | * This hook is for architectures that cannot support read_persistent_clock | |
1133 | * because their RTC/persistent clock is only accessible when irqs are enabled. | |
1134 | * | |
1135 | * This function should only be called by rtc_resume(), and allows | |
1136 | * a suspend offset to be injected into the timekeeping values. | |
1137 | */ | |
04d90890 | 1138 | void timekeeping_inject_sleeptime64(struct timespec64 *delta) |
304529b1 | 1139 | { |
3fdb14fd | 1140 | struct timekeeper *tk = &tk_core.timekeeper; |
92c1d3ed | 1141 | unsigned long flags; |
304529b1 | 1142 | |
31ade306 FT |
1143 | /* |
1144 | * Make sure we don't set the clock twice, as timekeeping_resume() | |
1145 | * already did it | |
1146 | */ | |
1147 | if (has_persistent_clock()) | |
304529b1 JS |
1148 | return; |
1149 | ||
9a7a71b1 | 1150 | raw_spin_lock_irqsave(&timekeeper_lock, flags); |
3fdb14fd | 1151 | write_seqcount_begin(&tk_core.seq); |
70471f2f | 1152 | |
4e250fdd | 1153 | timekeeping_forward_now(tk); |
304529b1 | 1154 | |
04d90890 | 1155 | __timekeeping_inject_sleeptime(tk, delta); |
304529b1 | 1156 | |
780427f0 | 1157 | timekeeping_update(tk, TK_CLEAR_NTP | TK_MIRROR | TK_CLOCK_WAS_SET); |
304529b1 | 1158 | |
3fdb14fd | 1159 | write_seqcount_end(&tk_core.seq); |
9a7a71b1 | 1160 | raw_spin_unlock_irqrestore(&timekeeper_lock, flags); |
304529b1 JS |
1161 | |
1162 | /* signal hrtimers about time change */ | |
1163 | clock_was_set(); | |
1164 | } | |
1165 | ||
8524070b | 1166 | /** |
1167 | * timekeeping_resume - Resumes the generic timekeeping subsystem. | |
8524070b | 1168 | * |
1169 | * This is for the generic clocksource timekeeping. | |
1170 | * xtime/wall_to_monotonic/jiffies/etc are | |
1171 | * still managed by arch specific suspend/resume code. | |
1172 | */ | |
e1a85b2c | 1173 | static void timekeeping_resume(void) |
8524070b | 1174 | { |
3fdb14fd | 1175 | struct timekeeper *tk = &tk_core.timekeeper; |
d28ede83 | 1176 | struct clocksource *clock = tk->tkr.clock; |
92c1d3ed | 1177 | unsigned long flags; |
7d489d15 JS |
1178 | struct timespec64 ts_new, ts_delta; |
1179 | struct timespec tmp; | |
e445cf1c FT |
1180 | cycle_t cycle_now, cycle_delta; |
1181 | bool suspendtime_found = false; | |
d4f587c6 | 1182 | |
7d489d15 JS |
1183 | read_persistent_clock(&tmp); |
1184 | ts_new = timespec_to_timespec64(tmp); | |
8524070b | 1185 | |
adc78e6b | 1186 | clockevents_resume(); |
d10ff3fb TG |
1187 | clocksource_resume(); |
1188 | ||
9a7a71b1 | 1189 | raw_spin_lock_irqsave(&timekeeper_lock, flags); |
3fdb14fd | 1190 | write_seqcount_begin(&tk_core.seq); |
8524070b | 1191 | |
e445cf1c FT |
1192 | /* |
1193 | * After system resumes, we need to calculate the suspended time and | |
1194 | * compensate it for the OS time. There are 3 sources that could be | |
1195 | * used: Nonstop clocksource during suspend, persistent clock and rtc | |
1196 | * device. | |
1197 | * | |
1198 | * One specific platform may have 1 or 2 or all of them, and the | |
1199 | * preference will be: | |
1200 | * suspend-nonstop clocksource -> persistent clock -> rtc | |
1201 | * The less preferred source will only be tried if there is no better | |
1202 | * usable source. The rtc part is handled separately in rtc core code. | |
1203 | */ | |
d28ede83 | 1204 | cycle_now = tk->tkr.read(clock); |
e445cf1c | 1205 | if ((clock->flags & CLOCK_SOURCE_SUSPEND_NONSTOP) && |
d28ede83 | 1206 | cycle_now > tk->tkr.cycle_last) { |
e445cf1c FT |
1207 | u64 num, max = ULLONG_MAX; |
1208 | u32 mult = clock->mult; | |
1209 | u32 shift = clock->shift; | |
1210 | s64 nsec = 0; | |
1211 | ||
d28ede83 TG |
1212 | cycle_delta = clocksource_delta(cycle_now, tk->tkr.cycle_last, |
1213 | tk->tkr.mask); | |
e445cf1c FT |
1214 | |
1215 | /* | |
1216 | * "cycle_delta * mutl" may cause 64 bits overflow, if the | |
1217 | * suspended time is too long. In that case we need do the | |
1218 | * 64 bits math carefully | |
1219 | */ | |
1220 | do_div(max, mult); | |
1221 | if (cycle_delta > max) { | |
1222 | num = div64_u64(cycle_delta, max); | |
1223 | nsec = (((u64) max * mult) >> shift) * num; | |
1224 | cycle_delta -= num * max; | |
1225 | } | |
1226 | nsec += ((u64) cycle_delta * mult) >> shift; | |
1227 | ||
7d489d15 | 1228 | ts_delta = ns_to_timespec64(nsec); |
e445cf1c | 1229 | suspendtime_found = true; |
7d489d15 JS |
1230 | } else if (timespec64_compare(&ts_new, &timekeeping_suspend_time) > 0) { |
1231 | ts_delta = timespec64_sub(ts_new, timekeeping_suspend_time); | |
e445cf1c | 1232 | suspendtime_found = true; |
8524070b | 1233 | } |
e445cf1c FT |
1234 | |
1235 | if (suspendtime_found) | |
1236 | __timekeeping_inject_sleeptime(tk, &ts_delta); | |
1237 | ||
1238 | /* Re-base the last cycle value */ | |
d28ede83 | 1239 | tk->tkr.cycle_last = cycle_now; |
4e250fdd | 1240 | tk->ntp_error = 0; |
8524070b | 1241 | timekeeping_suspended = 0; |
780427f0 | 1242 | timekeeping_update(tk, TK_MIRROR | TK_CLOCK_WAS_SET); |
3fdb14fd | 1243 | write_seqcount_end(&tk_core.seq); |
9a7a71b1 | 1244 | raw_spin_unlock_irqrestore(&timekeeper_lock, flags); |
8524070b | 1245 | |
1246 | touch_softlockup_watchdog(); | |
1247 | ||
1248 | clockevents_notify(CLOCK_EVT_NOTIFY_RESUME, NULL); | |
1249 | ||
1250 | /* Resume hrtimers */ | |
b12a03ce | 1251 | hrtimers_resume(); |
8524070b | 1252 | } |
1253 | ||
e1a85b2c | 1254 | static int timekeeping_suspend(void) |
8524070b | 1255 | { |
3fdb14fd | 1256 | struct timekeeper *tk = &tk_core.timekeeper; |
92c1d3ed | 1257 | unsigned long flags; |
7d489d15 JS |
1258 | struct timespec64 delta, delta_delta; |
1259 | static struct timespec64 old_delta; | |
1260 | struct timespec tmp; | |
8524070b | 1261 | |
7d489d15 JS |
1262 | read_persistent_clock(&tmp); |
1263 | timekeeping_suspend_time = timespec_to_timespec64(tmp); | |
3be90950 | 1264 | |
0d6bd995 ZM |
1265 | /* |
1266 | * On some systems the persistent_clock can not be detected at | |
1267 | * timekeeping_init by its return value, so if we see a valid | |
1268 | * value returned, update the persistent_clock_exists flag. | |
1269 | */ | |
1270 | if (timekeeping_suspend_time.tv_sec || timekeeping_suspend_time.tv_nsec) | |
1271 | persistent_clock_exist = true; | |
1272 | ||
9a7a71b1 | 1273 | raw_spin_lock_irqsave(&timekeeper_lock, flags); |
3fdb14fd | 1274 | write_seqcount_begin(&tk_core.seq); |
4e250fdd | 1275 | timekeeping_forward_now(tk); |
8524070b | 1276 | timekeeping_suspended = 1; |
cb33217b JS |
1277 | |
1278 | /* | |
1279 | * To avoid drift caused by repeated suspend/resumes, | |
1280 | * which each can add ~1 second drift error, | |
1281 | * try to compensate so the difference in system time | |
1282 | * and persistent_clock time stays close to constant. | |
1283 | */ | |
7d489d15 JS |
1284 | delta = timespec64_sub(tk_xtime(tk), timekeeping_suspend_time); |
1285 | delta_delta = timespec64_sub(delta, old_delta); | |
cb33217b JS |
1286 | if (abs(delta_delta.tv_sec) >= 2) { |
1287 | /* | |
1288 | * if delta_delta is too large, assume time correction | |
1289 | * has occured and set old_delta to the current delta. | |
1290 | */ | |
1291 | old_delta = delta; | |
1292 | } else { | |
1293 | /* Otherwise try to adjust old_system to compensate */ | |
1294 | timekeeping_suspend_time = | |
7d489d15 | 1295 | timespec64_add(timekeeping_suspend_time, delta_delta); |
cb33217b | 1296 | } |
330a1617 JS |
1297 | |
1298 | timekeeping_update(tk, TK_MIRROR); | |
3fdb14fd | 1299 | write_seqcount_end(&tk_core.seq); |
9a7a71b1 | 1300 | raw_spin_unlock_irqrestore(&timekeeper_lock, flags); |
8524070b | 1301 | |
1302 | clockevents_notify(CLOCK_EVT_NOTIFY_SUSPEND, NULL); | |
c54a42b1 | 1303 | clocksource_suspend(); |
adc78e6b | 1304 | clockevents_suspend(); |
8524070b | 1305 | |
1306 | return 0; | |
1307 | } | |
1308 | ||
1309 | /* sysfs resume/suspend bits for timekeeping */ | |
e1a85b2c | 1310 | static struct syscore_ops timekeeping_syscore_ops = { |
8524070b | 1311 | .resume = timekeeping_resume, |
1312 | .suspend = timekeeping_suspend, | |
8524070b | 1313 | }; |
1314 | ||
e1a85b2c | 1315 | static int __init timekeeping_init_ops(void) |
8524070b | 1316 | { |
e1a85b2c RW |
1317 | register_syscore_ops(&timekeeping_syscore_ops); |
1318 | return 0; | |
8524070b | 1319 | } |
e1a85b2c | 1320 | device_initcall(timekeeping_init_ops); |
8524070b | 1321 | |
1322 | /* | |
dc491596 | 1323 | * Apply a multiplier adjustment to the timekeeper |
8524070b | 1324 | */ |
dc491596 JS |
1325 | static __always_inline void timekeeping_apply_adjustment(struct timekeeper *tk, |
1326 | s64 offset, | |
1327 | bool negative, | |
1328 | int adj_scale) | |
8524070b | 1329 | { |
dc491596 JS |
1330 | s64 interval = tk->cycle_interval; |
1331 | s32 mult_adj = 1; | |
8524070b | 1332 | |
dc491596 JS |
1333 | if (negative) { |
1334 | mult_adj = -mult_adj; | |
1335 | interval = -interval; | |
1336 | offset = -offset; | |
1d17d174 | 1337 | } |
dc491596 JS |
1338 | mult_adj <<= adj_scale; |
1339 | interval <<= adj_scale; | |
1340 | offset <<= adj_scale; | |
8524070b | 1341 | |
c2bc1111 JS |
1342 | /* |
1343 | * So the following can be confusing. | |
1344 | * | |
dc491596 | 1345 | * To keep things simple, lets assume mult_adj == 1 for now. |
c2bc1111 | 1346 | * |
dc491596 | 1347 | * When mult_adj != 1, remember that the interval and offset values |
c2bc1111 JS |
1348 | * have been appropriately scaled so the math is the same. |
1349 | * | |
1350 | * The basic idea here is that we're increasing the multiplier | |
1351 | * by one, this causes the xtime_interval to be incremented by | |
1352 | * one cycle_interval. This is because: | |
1353 | * xtime_interval = cycle_interval * mult | |
1354 | * So if mult is being incremented by one: | |
1355 | * xtime_interval = cycle_interval * (mult + 1) | |
1356 | * Its the same as: | |
1357 | * xtime_interval = (cycle_interval * mult) + cycle_interval | |
1358 | * Which can be shortened to: | |
1359 | * xtime_interval += cycle_interval | |
1360 | * | |
1361 | * So offset stores the non-accumulated cycles. Thus the current | |
1362 | * time (in shifted nanoseconds) is: | |
1363 | * now = (offset * adj) + xtime_nsec | |
1364 | * Now, even though we're adjusting the clock frequency, we have | |
1365 | * to keep time consistent. In other words, we can't jump back | |
1366 | * in time, and we also want to avoid jumping forward in time. | |
1367 | * | |
1368 | * So given the same offset value, we need the time to be the same | |
1369 | * both before and after the freq adjustment. | |
1370 | * now = (offset * adj_1) + xtime_nsec_1 | |
1371 | * now = (offset * adj_2) + xtime_nsec_2 | |
1372 | * So: | |
1373 | * (offset * adj_1) + xtime_nsec_1 = | |
1374 | * (offset * adj_2) + xtime_nsec_2 | |
1375 | * And we know: | |
1376 | * adj_2 = adj_1 + 1 | |
1377 | * So: | |
1378 | * (offset * adj_1) + xtime_nsec_1 = | |
1379 | * (offset * (adj_1+1)) + xtime_nsec_2 | |
1380 | * (offset * adj_1) + xtime_nsec_1 = | |
1381 | * (offset * adj_1) + offset + xtime_nsec_2 | |
1382 | * Canceling the sides: | |
1383 | * xtime_nsec_1 = offset + xtime_nsec_2 | |
1384 | * Which gives us: | |
1385 | * xtime_nsec_2 = xtime_nsec_1 - offset | |
1386 | * Which simplfies to: | |
1387 | * xtime_nsec -= offset | |
1388 | * | |
1389 | * XXX - TODO: Doc ntp_error calculation. | |
1390 | */ | |
cb2aa634 | 1391 | if ((mult_adj > 0) && (tk->tkr.mult + mult_adj < mult_adj)) { |
6067dc5a | 1392 | /* NTP adjustment caused clocksource mult overflow */ |
1393 | WARN_ON_ONCE(1); | |
1394 | return; | |
1395 | } | |
1396 | ||
dc491596 | 1397 | tk->tkr.mult += mult_adj; |
f726a697 | 1398 | tk->xtime_interval += interval; |
d28ede83 | 1399 | tk->tkr.xtime_nsec -= offset; |
f726a697 | 1400 | tk->ntp_error -= (interval - offset) << tk->ntp_error_shift; |
dc491596 JS |
1401 | } |
1402 | ||
1403 | /* | |
1404 | * Calculate the multiplier adjustment needed to match the frequency | |
1405 | * specified by NTP | |
1406 | */ | |
1407 | static __always_inline void timekeeping_freqadjust(struct timekeeper *tk, | |
1408 | s64 offset) | |
1409 | { | |
1410 | s64 interval = tk->cycle_interval; | |
1411 | s64 xinterval = tk->xtime_interval; | |
1412 | s64 tick_error; | |
1413 | bool negative; | |
1414 | u32 adj; | |
1415 | ||
1416 | /* Remove any current error adj from freq calculation */ | |
1417 | if (tk->ntp_err_mult) | |
1418 | xinterval -= tk->cycle_interval; | |
1419 | ||
375f45b5 JS |
1420 | tk->ntp_tick = ntp_tick_length(); |
1421 | ||
dc491596 JS |
1422 | /* Calculate current error per tick */ |
1423 | tick_error = ntp_tick_length() >> tk->ntp_error_shift; | |
1424 | tick_error -= (xinterval + tk->xtime_remainder); | |
1425 | ||
1426 | /* Don't worry about correcting it if its small */ | |
1427 | if (likely((tick_error >= 0) && (tick_error <= interval))) | |
1428 | return; | |
1429 | ||
1430 | /* preserve the direction of correction */ | |
1431 | negative = (tick_error < 0); | |
1432 | ||
1433 | /* Sort out the magnitude of the correction */ | |
1434 | tick_error = abs(tick_error); | |
1435 | for (adj = 0; tick_error > interval; adj++) | |
1436 | tick_error >>= 1; | |
1437 | ||
1438 | /* scale the corrections */ | |
1439 | timekeeping_apply_adjustment(tk, offset, negative, adj); | |
1440 | } | |
1441 | ||
1442 | /* | |
1443 | * Adjust the timekeeper's multiplier to the correct frequency | |
1444 | * and also to reduce the accumulated error value. | |
1445 | */ | |
1446 | static void timekeeping_adjust(struct timekeeper *tk, s64 offset) | |
1447 | { | |
1448 | /* Correct for the current frequency error */ | |
1449 | timekeeping_freqadjust(tk, offset); | |
1450 | ||
1451 | /* Next make a small adjustment to fix any cumulative error */ | |
1452 | if (!tk->ntp_err_mult && (tk->ntp_error > 0)) { | |
1453 | tk->ntp_err_mult = 1; | |
1454 | timekeeping_apply_adjustment(tk, offset, 0, 0); | |
1455 | } else if (tk->ntp_err_mult && (tk->ntp_error <= 0)) { | |
1456 | /* Undo any existing error adjustment */ | |
1457 | timekeeping_apply_adjustment(tk, offset, 1, 0); | |
1458 | tk->ntp_err_mult = 0; | |
1459 | } | |
1460 | ||
1461 | if (unlikely(tk->tkr.clock->maxadj && | |
659bc17b | 1462 | (abs(tk->tkr.mult - tk->tkr.clock->mult) |
1463 | > tk->tkr.clock->maxadj))) { | |
dc491596 JS |
1464 | printk_once(KERN_WARNING |
1465 | "Adjusting %s more than 11%% (%ld vs %ld)\n", | |
1466 | tk->tkr.clock->name, (long)tk->tkr.mult, | |
1467 | (long)tk->tkr.clock->mult + tk->tkr.clock->maxadj); | |
1468 | } | |
2a8c0883 JS |
1469 | |
1470 | /* | |
1471 | * It may be possible that when we entered this function, xtime_nsec | |
1472 | * was very small. Further, if we're slightly speeding the clocksource | |
1473 | * in the code above, its possible the required corrective factor to | |
1474 | * xtime_nsec could cause it to underflow. | |
1475 | * | |
1476 | * Now, since we already accumulated the second, cannot simply roll | |
1477 | * the accumulated second back, since the NTP subsystem has been | |
1478 | * notified via second_overflow. So instead we push xtime_nsec forward | |
1479 | * by the amount we underflowed, and add that amount into the error. | |
1480 | * | |
1481 | * We'll correct this error next time through this function, when | |
1482 | * xtime_nsec is not as small. | |
1483 | */ | |
d28ede83 TG |
1484 | if (unlikely((s64)tk->tkr.xtime_nsec < 0)) { |
1485 | s64 neg = -(s64)tk->tkr.xtime_nsec; | |
1486 | tk->tkr.xtime_nsec = 0; | |
f726a697 | 1487 | tk->ntp_error += neg << tk->ntp_error_shift; |
2a8c0883 | 1488 | } |
8524070b | 1489 | } |
1490 | ||
1f4f9487 JS |
1491 | /** |
1492 | * accumulate_nsecs_to_secs - Accumulates nsecs into secs | |
1493 | * | |
1494 | * Helper function that accumulates a the nsecs greater then a second | |
1495 | * from the xtime_nsec field to the xtime_secs field. | |
1496 | * It also calls into the NTP code to handle leapsecond processing. | |
1497 | * | |
1498 | */ | |
780427f0 | 1499 | static inline unsigned int accumulate_nsecs_to_secs(struct timekeeper *tk) |
1f4f9487 | 1500 | { |
d28ede83 | 1501 | u64 nsecps = (u64)NSEC_PER_SEC << tk->tkr.shift; |
5258d3f2 | 1502 | unsigned int clock_set = 0; |
1f4f9487 | 1503 | |
d28ede83 | 1504 | while (tk->tkr.xtime_nsec >= nsecps) { |
1f4f9487 JS |
1505 | int leap; |
1506 | ||
d28ede83 | 1507 | tk->tkr.xtime_nsec -= nsecps; |
1f4f9487 JS |
1508 | tk->xtime_sec++; |
1509 | ||
1510 | /* Figure out if its a leap sec and apply if needed */ | |
1511 | leap = second_overflow(tk->xtime_sec); | |
6d0ef903 | 1512 | if (unlikely(leap)) { |
7d489d15 | 1513 | struct timespec64 ts; |
6d0ef903 JS |
1514 | |
1515 | tk->xtime_sec += leap; | |
1f4f9487 | 1516 | |
6d0ef903 JS |
1517 | ts.tv_sec = leap; |
1518 | ts.tv_nsec = 0; | |
1519 | tk_set_wall_to_mono(tk, | |
7d489d15 | 1520 | timespec64_sub(tk->wall_to_monotonic, ts)); |
6d0ef903 | 1521 | |
cc244dda JS |
1522 | __timekeeping_set_tai_offset(tk, tk->tai_offset - leap); |
1523 | ||
5258d3f2 | 1524 | clock_set = TK_CLOCK_WAS_SET; |
6d0ef903 | 1525 | } |
1f4f9487 | 1526 | } |
5258d3f2 | 1527 | return clock_set; |
1f4f9487 JS |
1528 | } |
1529 | ||
a092ff0f | 1530 | /** |
1531 | * logarithmic_accumulation - shifted accumulation of cycles | |
1532 | * | |
1533 | * This functions accumulates a shifted interval of cycles into | |
1534 | * into a shifted interval nanoseconds. Allows for O(log) accumulation | |
1535 | * loop. | |
1536 | * | |
1537 | * Returns the unconsumed cycles. | |
1538 | */ | |
f726a697 | 1539 | static cycle_t logarithmic_accumulation(struct timekeeper *tk, cycle_t offset, |
5258d3f2 JS |
1540 | u32 shift, |
1541 | unsigned int *clock_set) | |
a092ff0f | 1542 | { |
23a9537a | 1543 | cycle_t interval = tk->cycle_interval << shift; |
deda2e81 | 1544 | u64 raw_nsecs; |
a092ff0f | 1545 | |
f726a697 | 1546 | /* If the offset is smaller then a shifted interval, do nothing */ |
23a9537a | 1547 | if (offset < interval) |
a092ff0f | 1548 | return offset; |
1549 | ||
1550 | /* Accumulate one shifted interval */ | |
23a9537a | 1551 | offset -= interval; |
d28ede83 | 1552 | tk->tkr.cycle_last += interval; |
a092ff0f | 1553 | |
d28ede83 | 1554 | tk->tkr.xtime_nsec += tk->xtime_interval << shift; |
5258d3f2 | 1555 | *clock_set |= accumulate_nsecs_to_secs(tk); |
a092ff0f | 1556 | |
deda2e81 | 1557 | /* Accumulate raw time */ |
5b3900cd | 1558 | raw_nsecs = (u64)tk->raw_interval << shift; |
f726a697 | 1559 | raw_nsecs += tk->raw_time.tv_nsec; |
c7dcf87a JS |
1560 | if (raw_nsecs >= NSEC_PER_SEC) { |
1561 | u64 raw_secs = raw_nsecs; | |
1562 | raw_nsecs = do_div(raw_secs, NSEC_PER_SEC); | |
f726a697 | 1563 | tk->raw_time.tv_sec += raw_secs; |
a092ff0f | 1564 | } |
f726a697 | 1565 | tk->raw_time.tv_nsec = raw_nsecs; |
a092ff0f | 1566 | |
1567 | /* Accumulate error between NTP and clock interval */ | |
375f45b5 | 1568 | tk->ntp_error += tk->ntp_tick << shift; |
f726a697 JS |
1569 | tk->ntp_error -= (tk->xtime_interval + tk->xtime_remainder) << |
1570 | (tk->ntp_error_shift + shift); | |
a092ff0f | 1571 | |
1572 | return offset; | |
1573 | } | |
1574 | ||
8524070b | 1575 | /** |
1576 | * update_wall_time - Uses the current clocksource to increment the wall time | |
1577 | * | |
8524070b | 1578 | */ |
47a1b796 | 1579 | void update_wall_time(void) |
8524070b | 1580 | { |
3fdb14fd | 1581 | struct timekeeper *real_tk = &tk_core.timekeeper; |
48cdc135 | 1582 | struct timekeeper *tk = &shadow_timekeeper; |
8524070b | 1583 | cycle_t offset; |
a092ff0f | 1584 | int shift = 0, maxshift; |
5258d3f2 | 1585 | unsigned int clock_set = 0; |
70471f2f JS |
1586 | unsigned long flags; |
1587 | ||
9a7a71b1 | 1588 | raw_spin_lock_irqsave(&timekeeper_lock, flags); |
8524070b | 1589 | |
1590 | /* Make sure we're fully resumed: */ | |
1591 | if (unlikely(timekeeping_suspended)) | |
70471f2f | 1592 | goto out; |
8524070b | 1593 | |
592913ec | 1594 | #ifdef CONFIG_ARCH_USES_GETTIMEOFFSET |
48cdc135 | 1595 | offset = real_tk->cycle_interval; |
592913ec | 1596 | #else |
d28ede83 TG |
1597 | offset = clocksource_delta(tk->tkr.read(tk->tkr.clock), |
1598 | tk->tkr.cycle_last, tk->tkr.mask); | |
8524070b | 1599 | #endif |
8524070b | 1600 | |
bf2ac312 | 1601 | /* Check if there's really nothing to do */ |
48cdc135 | 1602 | if (offset < real_tk->cycle_interval) |
bf2ac312 JS |
1603 | goto out; |
1604 | ||
a092ff0f | 1605 | /* |
1606 | * With NO_HZ we may have to accumulate many cycle_intervals | |
1607 | * (think "ticks") worth of time at once. To do this efficiently, | |
1608 | * we calculate the largest doubling multiple of cycle_intervals | |
88b28adf | 1609 | * that is smaller than the offset. We then accumulate that |
a092ff0f | 1610 | * chunk in one go, and then try to consume the next smaller |
1611 | * doubled multiple. | |
8524070b | 1612 | */ |
4e250fdd | 1613 | shift = ilog2(offset) - ilog2(tk->cycle_interval); |
a092ff0f | 1614 | shift = max(0, shift); |
88b28adf | 1615 | /* Bound shift to one less than what overflows tick_length */ |
ea7cf49a | 1616 | maxshift = (64 - (ilog2(ntp_tick_length())+1)) - 1; |
a092ff0f | 1617 | shift = min(shift, maxshift); |
4e250fdd | 1618 | while (offset >= tk->cycle_interval) { |
5258d3f2 JS |
1619 | offset = logarithmic_accumulation(tk, offset, shift, |
1620 | &clock_set); | |
4e250fdd | 1621 | if (offset < tk->cycle_interval<<shift) |
830ec045 | 1622 | shift--; |
8524070b | 1623 | } |
1624 | ||
1625 | /* correct the clock when NTP error is too big */ | |
4e250fdd | 1626 | timekeeping_adjust(tk, offset); |
8524070b | 1627 | |
6a867a39 | 1628 | /* |
92bb1fcf JS |
1629 | * XXX This can be killed once everyone converts |
1630 | * to the new update_vsyscall. | |
1631 | */ | |
1632 | old_vsyscall_fixup(tk); | |
8524070b | 1633 | |
6a867a39 JS |
1634 | /* |
1635 | * Finally, make sure that after the rounding | |
1e75fa8b | 1636 | * xtime_nsec isn't larger than NSEC_PER_SEC |
6a867a39 | 1637 | */ |
5258d3f2 | 1638 | clock_set |= accumulate_nsecs_to_secs(tk); |
83f57a11 | 1639 | |
3fdb14fd | 1640 | write_seqcount_begin(&tk_core.seq); |
48cdc135 TG |
1641 | /* |
1642 | * Update the real timekeeper. | |
1643 | * | |
1644 | * We could avoid this memcpy by switching pointers, but that | |
1645 | * requires changes to all other timekeeper usage sites as | |
1646 | * well, i.e. move the timekeeper pointer getter into the | |
1647 | * spinlocked/seqcount protected sections. And we trade this | |
3fdb14fd | 1648 | * memcpy under the tk_core.seq against one before we start |
48cdc135 TG |
1649 | * updating. |
1650 | */ | |
1651 | memcpy(real_tk, tk, sizeof(*tk)); | |
5258d3f2 | 1652 | timekeeping_update(real_tk, clock_set); |
3fdb14fd | 1653 | write_seqcount_end(&tk_core.seq); |
ca4523cd | 1654 | out: |
9a7a71b1 | 1655 | raw_spin_unlock_irqrestore(&timekeeper_lock, flags); |
47a1b796 | 1656 | if (clock_set) |
cab5e127 JS |
1657 | /* Have to call _delayed version, since in irq context*/ |
1658 | clock_was_set_delayed(); | |
8524070b | 1659 | } |
7c3f1a57 TJ |
1660 | |
1661 | /** | |
d08c0cdd JS |
1662 | * getboottime64 - Return the real time of system boot. |
1663 | * @ts: pointer to the timespec64 to be set | |
7c3f1a57 | 1664 | * |
d08c0cdd | 1665 | * Returns the wall-time of boot in a timespec64. |
7c3f1a57 TJ |
1666 | * |
1667 | * This is based on the wall_to_monotonic offset and the total suspend | |
1668 | * time. Calls to settimeofday will affect the value returned (which | |
1669 | * basically means that however wrong your real time clock is at boot time, | |
1670 | * you get the right time here). | |
1671 | */ | |
d08c0cdd | 1672 | void getboottime64(struct timespec64 *ts) |
7c3f1a57 | 1673 | { |
3fdb14fd | 1674 | struct timekeeper *tk = &tk_core.timekeeper; |
02cba159 TG |
1675 | ktime_t t = ktime_sub(tk->offs_real, tk->offs_boot); |
1676 | ||
d08c0cdd | 1677 | *ts = ktime_to_timespec64(t); |
7c3f1a57 | 1678 | } |
d08c0cdd | 1679 | EXPORT_SYMBOL_GPL(getboottime64); |
7c3f1a57 | 1680 | |
17c38b74 | 1681 | unsigned long get_seconds(void) |
1682 | { | |
3fdb14fd | 1683 | struct timekeeper *tk = &tk_core.timekeeper; |
4e250fdd JS |
1684 | |
1685 | return tk->xtime_sec; | |
17c38b74 | 1686 | } |
1687 | EXPORT_SYMBOL(get_seconds); | |
1688 | ||
da15cfda | 1689 | struct timespec __current_kernel_time(void) |
1690 | { | |
3fdb14fd | 1691 | struct timekeeper *tk = &tk_core.timekeeper; |
4e250fdd | 1692 | |
7d489d15 | 1693 | return timespec64_to_timespec(tk_xtime(tk)); |
da15cfda | 1694 | } |
17c38b74 | 1695 | |
2c6b47de | 1696 | struct timespec current_kernel_time(void) |
1697 | { | |
3fdb14fd | 1698 | struct timekeeper *tk = &tk_core.timekeeper; |
7d489d15 | 1699 | struct timespec64 now; |
2c6b47de | 1700 | unsigned long seq; |
1701 | ||
1702 | do { | |
3fdb14fd | 1703 | seq = read_seqcount_begin(&tk_core.seq); |
83f57a11 | 1704 | |
4e250fdd | 1705 | now = tk_xtime(tk); |
3fdb14fd | 1706 | } while (read_seqcount_retry(&tk_core.seq, seq)); |
2c6b47de | 1707 | |
7d489d15 | 1708 | return timespec64_to_timespec(now); |
2c6b47de | 1709 | } |
2c6b47de | 1710 | EXPORT_SYMBOL(current_kernel_time); |
da15cfda | 1711 | |
334334b5 | 1712 | struct timespec64 get_monotonic_coarse64(void) |
da15cfda | 1713 | { |
3fdb14fd | 1714 | struct timekeeper *tk = &tk_core.timekeeper; |
7d489d15 | 1715 | struct timespec64 now, mono; |
da15cfda | 1716 | unsigned long seq; |
1717 | ||
1718 | do { | |
3fdb14fd | 1719 | seq = read_seqcount_begin(&tk_core.seq); |
83f57a11 | 1720 | |
4e250fdd JS |
1721 | now = tk_xtime(tk); |
1722 | mono = tk->wall_to_monotonic; | |
3fdb14fd | 1723 | } while (read_seqcount_retry(&tk_core.seq, seq)); |
da15cfda | 1724 | |
7d489d15 | 1725 | set_normalized_timespec64(&now, now.tv_sec + mono.tv_sec, |
da15cfda | 1726 | now.tv_nsec + mono.tv_nsec); |
7d489d15 | 1727 | |
334334b5 | 1728 | return now; |
da15cfda | 1729 | } |
871cf1e5 TH |
1730 | |
1731 | /* | |
d6ad4187 | 1732 | * Must hold jiffies_lock |
871cf1e5 TH |
1733 | */ |
1734 | void do_timer(unsigned long ticks) | |
1735 | { | |
1736 | jiffies_64 += ticks; | |
871cf1e5 TH |
1737 | calc_global_load(ticks); |
1738 | } | |
48cf76f7 TH |
1739 | |
1740 | /** | |
76f41088 JS |
1741 | * ktime_get_update_offsets_tick - hrtimer helper |
1742 | * @offs_real: pointer to storage for monotonic -> realtime offset | |
1743 | * @offs_boot: pointer to storage for monotonic -> boottime offset | |
1744 | * @offs_tai: pointer to storage for monotonic -> clock tai offset | |
1745 | * | |
1746 | * Returns monotonic time at last tick and various offsets | |
48cf76f7 | 1747 | */ |
76f41088 JS |
1748 | ktime_t ktime_get_update_offsets_tick(ktime_t *offs_real, ktime_t *offs_boot, |
1749 | ktime_t *offs_tai) | |
48cf76f7 | 1750 | { |
3fdb14fd | 1751 | struct timekeeper *tk = &tk_core.timekeeper; |
76f41088 | 1752 | unsigned int seq; |
48064f5f TG |
1753 | ktime_t base; |
1754 | u64 nsecs; | |
48cf76f7 TH |
1755 | |
1756 | do { | |
3fdb14fd | 1757 | seq = read_seqcount_begin(&tk_core.seq); |
76f41088 | 1758 | |
d28ede83 TG |
1759 | base = tk->tkr.base_mono; |
1760 | nsecs = tk->tkr.xtime_nsec >> tk->tkr.shift; | |
48064f5f | 1761 | |
76f41088 JS |
1762 | *offs_real = tk->offs_real; |
1763 | *offs_boot = tk->offs_boot; | |
1764 | *offs_tai = tk->offs_tai; | |
3fdb14fd | 1765 | } while (read_seqcount_retry(&tk_core.seq, seq)); |
76f41088 | 1766 | |
48064f5f | 1767 | return ktime_add_ns(base, nsecs); |
48cf76f7 | 1768 | } |
f0af911a | 1769 | |
f6c06abf TG |
1770 | #ifdef CONFIG_HIGH_RES_TIMERS |
1771 | /** | |
76f41088 | 1772 | * ktime_get_update_offsets_now - hrtimer helper |
f6c06abf TG |
1773 | * @offs_real: pointer to storage for monotonic -> realtime offset |
1774 | * @offs_boot: pointer to storage for monotonic -> boottime offset | |
b7bc50e4 | 1775 | * @offs_tai: pointer to storage for monotonic -> clock tai offset |
f6c06abf TG |
1776 | * |
1777 | * Returns current monotonic time and updates the offsets | |
b7bc50e4 | 1778 | * Called from hrtimer_interrupt() or retrigger_next_event() |
f6c06abf | 1779 | */ |
76f41088 | 1780 | ktime_t ktime_get_update_offsets_now(ktime_t *offs_real, ktime_t *offs_boot, |
90adda98 | 1781 | ktime_t *offs_tai) |
f6c06abf | 1782 | { |
3fdb14fd | 1783 | struct timekeeper *tk = &tk_core.timekeeper; |
f6c06abf | 1784 | unsigned int seq; |
a37c0aad TG |
1785 | ktime_t base; |
1786 | u64 nsecs; | |
f6c06abf TG |
1787 | |
1788 | do { | |
3fdb14fd | 1789 | seq = read_seqcount_begin(&tk_core.seq); |
f6c06abf | 1790 | |
d28ede83 | 1791 | base = tk->tkr.base_mono; |
0e5ac3a8 | 1792 | nsecs = timekeeping_get_ns(&tk->tkr); |
f6c06abf | 1793 | |
4e250fdd JS |
1794 | *offs_real = tk->offs_real; |
1795 | *offs_boot = tk->offs_boot; | |
90adda98 | 1796 | *offs_tai = tk->offs_tai; |
3fdb14fd | 1797 | } while (read_seqcount_retry(&tk_core.seq, seq)); |
f6c06abf | 1798 | |
a37c0aad | 1799 | return ktime_add_ns(base, nsecs); |
f6c06abf TG |
1800 | } |
1801 | #endif | |
1802 | ||
aa6f9c59 JS |
1803 | /** |
1804 | * do_adjtimex() - Accessor function to NTP __do_adjtimex function | |
1805 | */ | |
1806 | int do_adjtimex(struct timex *txc) | |
1807 | { | |
3fdb14fd | 1808 | struct timekeeper *tk = &tk_core.timekeeper; |
06c017fd | 1809 | unsigned long flags; |
7d489d15 | 1810 | struct timespec64 ts; |
4e8f8b34 | 1811 | s32 orig_tai, tai; |
e4085693 JS |
1812 | int ret; |
1813 | ||
1814 | /* Validate the data before disabling interrupts */ | |
1815 | ret = ntp_validate_timex(txc); | |
1816 | if (ret) | |
1817 | return ret; | |
1818 | ||
cef90377 JS |
1819 | if (txc->modes & ADJ_SETOFFSET) { |
1820 | struct timespec delta; | |
1821 | delta.tv_sec = txc->time.tv_sec; | |
1822 | delta.tv_nsec = txc->time.tv_usec; | |
1823 | if (!(txc->modes & ADJ_NANO)) | |
1824 | delta.tv_nsec *= 1000; | |
1825 | ret = timekeeping_inject_offset(&delta); | |
1826 | if (ret) | |
1827 | return ret; | |
1828 | } | |
1829 | ||
d6d29896 | 1830 | getnstimeofday64(&ts); |
87ace39b | 1831 | |
06c017fd | 1832 | raw_spin_lock_irqsave(&timekeeper_lock, flags); |
3fdb14fd | 1833 | write_seqcount_begin(&tk_core.seq); |
06c017fd | 1834 | |
4e8f8b34 | 1835 | orig_tai = tai = tk->tai_offset; |
87ace39b | 1836 | ret = __do_adjtimex(txc, &ts, &tai); |
aa6f9c59 | 1837 | |
4e8f8b34 JS |
1838 | if (tai != orig_tai) { |
1839 | __timekeeping_set_tai_offset(tk, tai); | |
f55c0760 | 1840 | timekeeping_update(tk, TK_MIRROR | TK_CLOCK_WAS_SET); |
4e8f8b34 | 1841 | } |
3fdb14fd | 1842 | write_seqcount_end(&tk_core.seq); |
06c017fd JS |
1843 | raw_spin_unlock_irqrestore(&timekeeper_lock, flags); |
1844 | ||
6fdda9a9 JS |
1845 | if (tai != orig_tai) |
1846 | clock_was_set(); | |
1847 | ||
7bd36014 JS |
1848 | ntp_notify_cmos_timer(); |
1849 | ||
87ace39b JS |
1850 | return ret; |
1851 | } | |
aa6f9c59 JS |
1852 | |
1853 | #ifdef CONFIG_NTP_PPS | |
1854 | /** | |
1855 | * hardpps() - Accessor function to NTP __hardpps function | |
1856 | */ | |
1857 | void hardpps(const struct timespec *phase_ts, const struct timespec *raw_ts) | |
1858 | { | |
06c017fd JS |
1859 | unsigned long flags; |
1860 | ||
1861 | raw_spin_lock_irqsave(&timekeeper_lock, flags); | |
3fdb14fd | 1862 | write_seqcount_begin(&tk_core.seq); |
06c017fd | 1863 | |
aa6f9c59 | 1864 | __hardpps(phase_ts, raw_ts); |
06c017fd | 1865 | |
3fdb14fd | 1866 | write_seqcount_end(&tk_core.seq); |
06c017fd | 1867 | raw_spin_unlock_irqrestore(&timekeeper_lock, flags); |
aa6f9c59 JS |
1868 | } |
1869 | EXPORT_SYMBOL(hardpps); | |
1870 | #endif | |
1871 | ||
f0af911a TH |
1872 | /** |
1873 | * xtime_update() - advances the timekeeping infrastructure | |
1874 | * @ticks: number of ticks, that have elapsed since the last call. | |
1875 | * | |
1876 | * Must be called with interrupts disabled. | |
1877 | */ | |
1878 | void xtime_update(unsigned long ticks) | |
1879 | { | |
d6ad4187 | 1880 | write_seqlock(&jiffies_lock); |
f0af911a | 1881 | do_timer(ticks); |
d6ad4187 | 1882 | write_sequnlock(&jiffies_lock); |
47a1b796 | 1883 | update_wall_time(); |
f0af911a | 1884 | } |