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 | ||
3c17ad19 JS |
121 | #ifdef CONFIG_DEBUG_TIMEKEEPING |
122 | static void timekeeping_check_update(struct timekeeper *tk, cycle_t offset) | |
123 | { | |
124 | ||
125 | cycle_t max_cycles = tk->tkr.clock->max_cycles; | |
126 | const char *name = tk->tkr.clock->name; | |
127 | ||
128 | if (offset > max_cycles) { | |
a558cd02 | 129 | printk_deferred("WARNING: timekeeping: Cycle offset (%lld) is larger than allowed by the '%s' clock's max_cycles value (%lld): time overflow danger\n", |
3c17ad19 | 130 | offset, name, max_cycles); |
a558cd02 | 131 | printk_deferred(" timekeeping: Your kernel is sick, but tries to cope by capping time updates\n"); |
3c17ad19 JS |
132 | } else { |
133 | if (offset > (max_cycles >> 1)) { | |
134 | printk_deferred("INFO: timekeeping: Cycle offset (%lld) is larger than the the '%s' clock's 50%% safety margin (%lld)\n", | |
135 | offset, name, max_cycles >> 1); | |
136 | printk_deferred(" timekeeping: Your kernel is still fine, but is feeling a bit nervous\n"); | |
137 | } | |
138 | } | |
139 | } | |
a558cd02 JS |
140 | |
141 | static inline cycle_t timekeeping_get_delta(struct tk_read_base *tkr) | |
142 | { | |
143 | cycle_t cycle_now, delta; | |
144 | ||
145 | /* read clocksource */ | |
146 | cycle_now = tkr->read(tkr->clock); | |
147 | ||
148 | /* calculate the delta since the last update_wall_time */ | |
149 | delta = clocksource_delta(cycle_now, tkr->cycle_last, tkr->mask); | |
150 | ||
057b87e3 JS |
151 | /* |
152 | * Try to catch underflows by checking if we are seeing small | |
153 | * mask-relative negative values. | |
154 | */ | |
155 | if (unlikely((~delta & tkr->mask) < (tkr->mask >> 3))) | |
156 | delta = 0; | |
157 | ||
a558cd02 JS |
158 | /* Cap delta value to the max_cycles values to avoid mult overflows */ |
159 | if (unlikely(delta > tkr->clock->max_cycles)) | |
160 | delta = tkr->clock->max_cycles; | |
161 | ||
162 | return delta; | |
163 | } | |
3c17ad19 JS |
164 | #else |
165 | static inline void timekeeping_check_update(struct timekeeper *tk, cycle_t offset) | |
166 | { | |
167 | } | |
a558cd02 JS |
168 | static inline cycle_t timekeeping_get_delta(struct tk_read_base *tkr) |
169 | { | |
170 | cycle_t cycle_now, delta; | |
171 | ||
172 | /* read clocksource */ | |
173 | cycle_now = tkr->read(tkr->clock); | |
174 | ||
175 | /* calculate the delta since the last update_wall_time */ | |
176 | delta = clocksource_delta(cycle_now, tkr->cycle_last, tkr->mask); | |
177 | ||
178 | return delta; | |
179 | } | |
3c17ad19 JS |
180 | #endif |
181 | ||
155ec602 | 182 | /** |
d26e4fe0 | 183 | * tk_setup_internals - Set up internals to use clocksource clock. |
155ec602 | 184 | * |
d26e4fe0 | 185 | * @tk: The target timekeeper to setup. |
155ec602 MS |
186 | * @clock: Pointer to clocksource. |
187 | * | |
188 | * Calculates a fixed cycle/nsec interval for a given clocksource/adjustment | |
189 | * pair and interval request. | |
190 | * | |
191 | * Unless you're the timekeeping code, you should not be using this! | |
192 | */ | |
f726a697 | 193 | static void tk_setup_internals(struct timekeeper *tk, struct clocksource *clock) |
155ec602 MS |
194 | { |
195 | cycle_t interval; | |
a386b5af | 196 | u64 tmp, ntpinterval; |
1e75fa8b | 197 | struct clocksource *old_clock; |
155ec602 | 198 | |
d28ede83 TG |
199 | old_clock = tk->tkr.clock; |
200 | tk->tkr.clock = clock; | |
201 | tk->tkr.read = clock->read; | |
202 | tk->tkr.mask = clock->mask; | |
203 | tk->tkr.cycle_last = tk->tkr.read(clock); | |
155ec602 MS |
204 | |
205 | /* Do the ns -> cycle conversion first, using original mult */ | |
206 | tmp = NTP_INTERVAL_LENGTH; | |
207 | tmp <<= clock->shift; | |
a386b5af | 208 | ntpinterval = tmp; |
0a544198 MS |
209 | tmp += clock->mult/2; |
210 | do_div(tmp, clock->mult); | |
155ec602 MS |
211 | if (tmp == 0) |
212 | tmp = 1; | |
213 | ||
214 | interval = (cycle_t) tmp; | |
f726a697 | 215 | tk->cycle_interval = interval; |
155ec602 MS |
216 | |
217 | /* Go back from cycles -> shifted ns */ | |
f726a697 JS |
218 | tk->xtime_interval = (u64) interval * clock->mult; |
219 | tk->xtime_remainder = ntpinterval - tk->xtime_interval; | |
220 | tk->raw_interval = | |
0a544198 | 221 | ((u64) interval * clock->mult) >> clock->shift; |
155ec602 | 222 | |
1e75fa8b JS |
223 | /* if changing clocks, convert xtime_nsec shift units */ |
224 | if (old_clock) { | |
225 | int shift_change = clock->shift - old_clock->shift; | |
226 | if (shift_change < 0) | |
d28ede83 | 227 | tk->tkr.xtime_nsec >>= -shift_change; |
1e75fa8b | 228 | else |
d28ede83 | 229 | tk->tkr.xtime_nsec <<= shift_change; |
1e75fa8b | 230 | } |
d28ede83 | 231 | tk->tkr.shift = clock->shift; |
155ec602 | 232 | |
f726a697 JS |
233 | tk->ntp_error = 0; |
234 | tk->ntp_error_shift = NTP_SCALE_SHIFT - clock->shift; | |
375f45b5 | 235 | tk->ntp_tick = ntpinterval << tk->ntp_error_shift; |
0a544198 MS |
236 | |
237 | /* | |
238 | * The timekeeper keeps its own mult values for the currently | |
239 | * active clocksource. These value will be adjusted via NTP | |
240 | * to counteract clock drifting. | |
241 | */ | |
d28ede83 | 242 | tk->tkr.mult = clock->mult; |
dc491596 | 243 | tk->ntp_err_mult = 0; |
155ec602 | 244 | } |
8524070b | 245 | |
2ba2a305 | 246 | /* Timekeeper helper functions. */ |
7b1f6207 SW |
247 | |
248 | #ifdef CONFIG_ARCH_USES_GETTIMEOFFSET | |
e06fde37 TG |
249 | static u32 default_arch_gettimeoffset(void) { return 0; } |
250 | u32 (*arch_gettimeoffset)(void) = default_arch_gettimeoffset; | |
7b1f6207 | 251 | #else |
e06fde37 | 252 | static inline u32 arch_gettimeoffset(void) { return 0; } |
7b1f6207 SW |
253 | #endif |
254 | ||
0e5ac3a8 | 255 | static inline s64 timekeeping_get_ns(struct tk_read_base *tkr) |
2ba2a305 | 256 | { |
a558cd02 | 257 | cycle_t delta; |
1e75fa8b | 258 | s64 nsec; |
2ba2a305 | 259 | |
a558cd02 | 260 | delta = timekeeping_get_delta(tkr); |
2ba2a305 | 261 | |
0e5ac3a8 TG |
262 | nsec = delta * tkr->mult + tkr->xtime_nsec; |
263 | nsec >>= tkr->shift; | |
f2a5a085 | 264 | |
7b1f6207 | 265 | /* If arch requires, add in get_arch_timeoffset() */ |
e06fde37 | 266 | return nsec + arch_gettimeoffset(); |
2ba2a305 MS |
267 | } |
268 | ||
f726a697 | 269 | static inline s64 timekeeping_get_ns_raw(struct timekeeper *tk) |
2ba2a305 | 270 | { |
d28ede83 | 271 | struct clocksource *clock = tk->tkr.clock; |
a558cd02 | 272 | cycle_t delta; |
f2a5a085 | 273 | s64 nsec; |
2ba2a305 | 274 | |
a558cd02 | 275 | delta = timekeeping_get_delta(&tk->tkr); |
2ba2a305 | 276 | |
f2a5a085 | 277 | /* convert delta to nanoseconds. */ |
3a978377 | 278 | nsec = clocksource_cyc2ns(delta, clock->mult, clock->shift); |
f2a5a085 | 279 | |
7b1f6207 | 280 | /* If arch requires, add in get_arch_timeoffset() */ |
e06fde37 | 281 | return nsec + arch_gettimeoffset(); |
2ba2a305 MS |
282 | } |
283 | ||
4396e058 TG |
284 | /** |
285 | * update_fast_timekeeper - Update the fast and NMI safe monotonic timekeeper. | |
affe3e85 | 286 | * @tkr: Timekeeping readout base from which we take the update |
4396e058 TG |
287 | * |
288 | * We want to use this from any context including NMI and tracing / | |
289 | * instrumenting the timekeeping code itself. | |
290 | * | |
291 | * So we handle this differently than the other timekeeping accessor | |
292 | * functions which retry when the sequence count has changed. The | |
293 | * update side does: | |
294 | * | |
295 | * smp_wmb(); <- Ensure that the last base[1] update is visible | |
296 | * tkf->seq++; | |
297 | * smp_wmb(); <- Ensure that the seqcount update is visible | |
affe3e85 | 298 | * update(tkf->base[0], tkr); |
4396e058 TG |
299 | * smp_wmb(); <- Ensure that the base[0] update is visible |
300 | * tkf->seq++; | |
301 | * smp_wmb(); <- Ensure that the seqcount update is visible | |
affe3e85 | 302 | * update(tkf->base[1], tkr); |
4396e058 TG |
303 | * |
304 | * The reader side does: | |
305 | * | |
306 | * do { | |
307 | * seq = tkf->seq; | |
308 | * smp_rmb(); | |
309 | * idx = seq & 0x01; | |
310 | * now = now(tkf->base[idx]); | |
311 | * smp_rmb(); | |
312 | * } while (seq != tkf->seq) | |
313 | * | |
314 | * As long as we update base[0] readers are forced off to | |
315 | * base[1]. Once base[0] is updated readers are redirected to base[0] | |
316 | * and the base[1] update takes place. | |
317 | * | |
318 | * So if a NMI hits the update of base[0] then it will use base[1] | |
319 | * which is still consistent. In the worst case this can result is a | |
320 | * slightly wrong timestamp (a few nanoseconds). See | |
321 | * @ktime_get_mono_fast_ns. | |
322 | */ | |
affe3e85 | 323 | static void update_fast_timekeeper(struct tk_read_base *tkr) |
4396e058 TG |
324 | { |
325 | struct tk_read_base *base = tk_fast_mono.base; | |
326 | ||
327 | /* Force readers off to base[1] */ | |
328 | raw_write_seqcount_latch(&tk_fast_mono.seq); | |
329 | ||
330 | /* Update base[0] */ | |
affe3e85 | 331 | memcpy(base, tkr, sizeof(*base)); |
4396e058 TG |
332 | |
333 | /* Force readers back to base[0] */ | |
334 | raw_write_seqcount_latch(&tk_fast_mono.seq); | |
335 | ||
336 | /* Update base[1] */ | |
337 | memcpy(base + 1, base, sizeof(*base)); | |
338 | } | |
339 | ||
340 | /** | |
341 | * ktime_get_mono_fast_ns - Fast NMI safe access to clock monotonic | |
342 | * | |
343 | * This timestamp is not guaranteed to be monotonic across an update. | |
344 | * The timestamp is calculated by: | |
345 | * | |
346 | * now = base_mono + clock_delta * slope | |
347 | * | |
348 | * So if the update lowers the slope, readers who are forced to the | |
349 | * not yet updated second array are still using the old steeper slope. | |
350 | * | |
351 | * tmono | |
352 | * ^ | |
353 | * | o n | |
354 | * | o n | |
355 | * | u | |
356 | * | o | |
357 | * |o | |
358 | * |12345678---> reader order | |
359 | * | |
360 | * o = old slope | |
361 | * u = update | |
362 | * n = new slope | |
363 | * | |
364 | * So reader 6 will observe time going backwards versus reader 5. | |
365 | * | |
366 | * While other CPUs are likely to be able observe that, the only way | |
367 | * for a CPU local observation is when an NMI hits in the middle of | |
368 | * the update. Timestamps taken from that NMI context might be ahead | |
369 | * of the following timestamps. Callers need to be aware of that and | |
370 | * deal with it. | |
371 | */ | |
372 | u64 notrace ktime_get_mono_fast_ns(void) | |
373 | { | |
374 | struct tk_read_base *tkr; | |
375 | unsigned int seq; | |
376 | u64 now; | |
377 | ||
378 | do { | |
379 | seq = raw_read_seqcount(&tk_fast_mono.seq); | |
380 | tkr = tk_fast_mono.base + (seq & 0x01); | |
381 | now = ktime_to_ns(tkr->base_mono) + timekeeping_get_ns(tkr); | |
382 | ||
383 | } while (read_seqcount_retry(&tk_fast_mono.seq, seq)); | |
384 | return now; | |
385 | } | |
386 | EXPORT_SYMBOL_GPL(ktime_get_mono_fast_ns); | |
387 | ||
060407ae RW |
388 | /* Suspend-time cycles value for halted fast timekeeper. */ |
389 | static cycle_t cycles_at_suspend; | |
390 | ||
391 | static cycle_t dummy_clock_read(struct clocksource *cs) | |
392 | { | |
393 | return cycles_at_suspend; | |
394 | } | |
395 | ||
396 | /** | |
397 | * halt_fast_timekeeper - Prevent fast timekeeper from accessing clocksource. | |
398 | * @tk: Timekeeper to snapshot. | |
399 | * | |
400 | * It generally is unsafe to access the clocksource after timekeeping has been | |
401 | * suspended, so take a snapshot of the readout base of @tk and use it as the | |
402 | * fast timekeeper's readout base while suspended. It will return the same | |
403 | * number of cycles every time until timekeeping is resumed at which time the | |
404 | * proper readout base for the fast timekeeper will be restored automatically. | |
405 | */ | |
406 | static void halt_fast_timekeeper(struct timekeeper *tk) | |
407 | { | |
408 | static struct tk_read_base tkr_dummy; | |
409 | struct tk_read_base *tkr = &tk->tkr; | |
410 | ||
411 | memcpy(&tkr_dummy, tkr, sizeof(tkr_dummy)); | |
412 | cycles_at_suspend = tkr->read(tkr->clock); | |
413 | tkr_dummy.read = dummy_clock_read; | |
414 | update_fast_timekeeper(&tkr_dummy); | |
415 | } | |
416 | ||
c905fae4 TG |
417 | #ifdef CONFIG_GENERIC_TIME_VSYSCALL_OLD |
418 | ||
419 | static inline void update_vsyscall(struct timekeeper *tk) | |
420 | { | |
0680eb1f | 421 | struct timespec xt, wm; |
c905fae4 | 422 | |
e2dff1ec | 423 | xt = timespec64_to_timespec(tk_xtime(tk)); |
0680eb1f JS |
424 | wm = timespec64_to_timespec(tk->wall_to_monotonic); |
425 | update_vsyscall_old(&xt, &wm, tk->tkr.clock, tk->tkr.mult, | |
d28ede83 | 426 | tk->tkr.cycle_last); |
c905fae4 TG |
427 | } |
428 | ||
429 | static inline void old_vsyscall_fixup(struct timekeeper *tk) | |
430 | { | |
431 | s64 remainder; | |
432 | ||
433 | /* | |
434 | * Store only full nanoseconds into xtime_nsec after rounding | |
435 | * it up and add the remainder to the error difference. | |
436 | * XXX - This is necessary to avoid small 1ns inconsistnecies caused | |
437 | * by truncating the remainder in vsyscalls. However, it causes | |
438 | * additional work to be done in timekeeping_adjust(). Once | |
439 | * the vsyscall implementations are converted to use xtime_nsec | |
440 | * (shifted nanoseconds), and CONFIG_GENERIC_TIME_VSYSCALL_OLD | |
441 | * users are removed, this can be killed. | |
442 | */ | |
d28ede83 TG |
443 | remainder = tk->tkr.xtime_nsec & ((1ULL << tk->tkr.shift) - 1); |
444 | tk->tkr.xtime_nsec -= remainder; | |
445 | tk->tkr.xtime_nsec += 1ULL << tk->tkr.shift; | |
c905fae4 | 446 | tk->ntp_error += remainder << tk->ntp_error_shift; |
d28ede83 | 447 | tk->ntp_error -= (1ULL << tk->tkr.shift) << tk->ntp_error_shift; |
c905fae4 TG |
448 | } |
449 | #else | |
450 | #define old_vsyscall_fixup(tk) | |
451 | #endif | |
452 | ||
e0b306fe MT |
453 | static RAW_NOTIFIER_HEAD(pvclock_gtod_chain); |
454 | ||
780427f0 | 455 | static void update_pvclock_gtod(struct timekeeper *tk, bool was_set) |
e0b306fe | 456 | { |
780427f0 | 457 | raw_notifier_call_chain(&pvclock_gtod_chain, was_set, tk); |
e0b306fe MT |
458 | } |
459 | ||
460 | /** | |
461 | * pvclock_gtod_register_notifier - register a pvclock timedata update listener | |
e0b306fe MT |
462 | */ |
463 | int pvclock_gtod_register_notifier(struct notifier_block *nb) | |
464 | { | |
3fdb14fd | 465 | struct timekeeper *tk = &tk_core.timekeeper; |
e0b306fe MT |
466 | unsigned long flags; |
467 | int ret; | |
468 | ||
9a7a71b1 | 469 | raw_spin_lock_irqsave(&timekeeper_lock, flags); |
e0b306fe | 470 | ret = raw_notifier_chain_register(&pvclock_gtod_chain, nb); |
780427f0 | 471 | update_pvclock_gtod(tk, true); |
9a7a71b1 | 472 | raw_spin_unlock_irqrestore(&timekeeper_lock, flags); |
e0b306fe MT |
473 | |
474 | return ret; | |
475 | } | |
476 | EXPORT_SYMBOL_GPL(pvclock_gtod_register_notifier); | |
477 | ||
478 | /** | |
479 | * pvclock_gtod_unregister_notifier - unregister a pvclock | |
480 | * timedata update listener | |
e0b306fe MT |
481 | */ |
482 | int pvclock_gtod_unregister_notifier(struct notifier_block *nb) | |
483 | { | |
e0b306fe MT |
484 | unsigned long flags; |
485 | int ret; | |
486 | ||
9a7a71b1 | 487 | raw_spin_lock_irqsave(&timekeeper_lock, flags); |
e0b306fe | 488 | ret = raw_notifier_chain_unregister(&pvclock_gtod_chain, nb); |
9a7a71b1 | 489 | raw_spin_unlock_irqrestore(&timekeeper_lock, flags); |
e0b306fe MT |
490 | |
491 | return ret; | |
492 | } | |
493 | EXPORT_SYMBOL_GPL(pvclock_gtod_unregister_notifier); | |
494 | ||
7c032df5 TG |
495 | /* |
496 | * Update the ktime_t based scalar nsec members of the timekeeper | |
497 | */ | |
498 | static inline void tk_update_ktime_data(struct timekeeper *tk) | |
499 | { | |
9e3680b1 HS |
500 | u64 seconds; |
501 | u32 nsec; | |
7c032df5 TG |
502 | |
503 | /* | |
504 | * The xtime based monotonic readout is: | |
505 | * nsec = (xtime_sec + wtm_sec) * 1e9 + wtm_nsec + now(); | |
506 | * The ktime based monotonic readout is: | |
507 | * nsec = base_mono + now(); | |
508 | * ==> base_mono = (xtime_sec + wtm_sec) * 1e9 + wtm_nsec | |
509 | */ | |
9e3680b1 HS |
510 | seconds = (u64)(tk->xtime_sec + tk->wall_to_monotonic.tv_sec); |
511 | nsec = (u32) tk->wall_to_monotonic.tv_nsec; | |
512 | tk->tkr.base_mono = ns_to_ktime(seconds * NSEC_PER_SEC + nsec); | |
f519b1a2 TG |
513 | |
514 | /* Update the monotonic raw base */ | |
515 | tk->base_raw = timespec64_to_ktime(tk->raw_time); | |
9e3680b1 HS |
516 | |
517 | /* | |
518 | * The sum of the nanoseconds portions of xtime and | |
519 | * wall_to_monotonic can be greater/equal one second. Take | |
520 | * this into account before updating tk->ktime_sec. | |
521 | */ | |
522 | nsec += (u32)(tk->tkr.xtime_nsec >> tk->tkr.shift); | |
523 | if (nsec >= NSEC_PER_SEC) | |
524 | seconds++; | |
525 | tk->ktime_sec = seconds; | |
7c032df5 TG |
526 | } |
527 | ||
9a7a71b1 | 528 | /* must hold timekeeper_lock */ |
04397fe9 | 529 | static void timekeeping_update(struct timekeeper *tk, unsigned int action) |
cc06268c | 530 | { |
04397fe9 | 531 | if (action & TK_CLEAR_NTP) { |
f726a697 | 532 | tk->ntp_error = 0; |
cc06268c TG |
533 | ntp_clear(); |
534 | } | |
48cdc135 | 535 | |
7c032df5 TG |
536 | tk_update_ktime_data(tk); |
537 | ||
9bf2419f TG |
538 | update_vsyscall(tk); |
539 | update_pvclock_gtod(tk, action & TK_CLOCK_WAS_SET); | |
540 | ||
04397fe9 | 541 | if (action & TK_MIRROR) |
3fdb14fd TG |
542 | memcpy(&shadow_timekeeper, &tk_core.timekeeper, |
543 | sizeof(tk_core.timekeeper)); | |
4396e058 | 544 | |
affe3e85 | 545 | update_fast_timekeeper(&tk->tkr); |
cc06268c TG |
546 | } |
547 | ||
8524070b | 548 | /** |
155ec602 | 549 | * timekeeping_forward_now - update clock to the current time |
8524070b | 550 | * |
9a055117 RZ |
551 | * Forward the current clock to update its state since the last call to |
552 | * update_wall_time(). This is useful before significant clock changes, | |
553 | * as it avoids having to deal with this time offset explicitly. | |
8524070b | 554 | */ |
f726a697 | 555 | static void timekeeping_forward_now(struct timekeeper *tk) |
8524070b | 556 | { |
d28ede83 | 557 | struct clocksource *clock = tk->tkr.clock; |
3a978377 | 558 | cycle_t cycle_now, delta; |
9a055117 | 559 | s64 nsec; |
8524070b | 560 | |
d28ede83 TG |
561 | cycle_now = tk->tkr.read(clock); |
562 | delta = clocksource_delta(cycle_now, tk->tkr.cycle_last, tk->tkr.mask); | |
563 | tk->tkr.cycle_last = cycle_now; | |
8524070b | 564 | |
d28ede83 | 565 | tk->tkr.xtime_nsec += delta * tk->tkr.mult; |
7d27558c | 566 | |
7b1f6207 | 567 | /* If arch requires, add in get_arch_timeoffset() */ |
d28ede83 | 568 | tk->tkr.xtime_nsec += (u64)arch_gettimeoffset() << tk->tkr.shift; |
7d27558c | 569 | |
f726a697 | 570 | tk_normalize_xtime(tk); |
2d42244a | 571 | |
3a978377 | 572 | nsec = clocksource_cyc2ns(delta, clock->mult, clock->shift); |
7d489d15 | 573 | timespec64_add_ns(&tk->raw_time, nsec); |
8524070b | 574 | } |
575 | ||
576 | /** | |
d6d29896 | 577 | * __getnstimeofday64 - Returns the time of day in a timespec64. |
8524070b | 578 | * @ts: pointer to the timespec to be set |
579 | * | |
1e817fb6 KC |
580 | * Updates the time of day in the timespec. |
581 | * Returns 0 on success, or -ve when suspended (timespec will be undefined). | |
8524070b | 582 | */ |
d6d29896 | 583 | int __getnstimeofday64(struct timespec64 *ts) |
8524070b | 584 | { |
3fdb14fd | 585 | struct timekeeper *tk = &tk_core.timekeeper; |
8524070b | 586 | unsigned long seq; |
1e75fa8b | 587 | s64 nsecs = 0; |
8524070b | 588 | |
589 | do { | |
3fdb14fd | 590 | seq = read_seqcount_begin(&tk_core.seq); |
8524070b | 591 | |
4e250fdd | 592 | ts->tv_sec = tk->xtime_sec; |
0e5ac3a8 | 593 | nsecs = timekeeping_get_ns(&tk->tkr); |
8524070b | 594 | |
3fdb14fd | 595 | } while (read_seqcount_retry(&tk_core.seq, seq)); |
8524070b | 596 | |
ec145bab | 597 | ts->tv_nsec = 0; |
d6d29896 | 598 | timespec64_add_ns(ts, nsecs); |
1e817fb6 KC |
599 | |
600 | /* | |
601 | * Do not bail out early, in case there were callers still using | |
602 | * the value, even in the face of the WARN_ON. | |
603 | */ | |
604 | if (unlikely(timekeeping_suspended)) | |
605 | return -EAGAIN; | |
606 | return 0; | |
607 | } | |
d6d29896 | 608 | EXPORT_SYMBOL(__getnstimeofday64); |
1e817fb6 KC |
609 | |
610 | /** | |
d6d29896 | 611 | * getnstimeofday64 - Returns the time of day in a timespec64. |
5322e4c2 | 612 | * @ts: pointer to the timespec64 to be set |
1e817fb6 | 613 | * |
5322e4c2 | 614 | * Returns the time of day in a timespec64 (WARN if suspended). |
1e817fb6 | 615 | */ |
d6d29896 | 616 | void getnstimeofday64(struct timespec64 *ts) |
1e817fb6 | 617 | { |
d6d29896 | 618 | WARN_ON(__getnstimeofday64(ts)); |
8524070b | 619 | } |
d6d29896 | 620 | EXPORT_SYMBOL(getnstimeofday64); |
8524070b | 621 | |
951ed4d3 MS |
622 | ktime_t ktime_get(void) |
623 | { | |
3fdb14fd | 624 | struct timekeeper *tk = &tk_core.timekeeper; |
951ed4d3 | 625 | unsigned int seq; |
a016a5bd TG |
626 | ktime_t base; |
627 | s64 nsecs; | |
951ed4d3 MS |
628 | |
629 | WARN_ON(timekeeping_suspended); | |
630 | ||
631 | do { | |
3fdb14fd | 632 | seq = read_seqcount_begin(&tk_core.seq); |
d28ede83 | 633 | base = tk->tkr.base_mono; |
0e5ac3a8 | 634 | nsecs = timekeeping_get_ns(&tk->tkr); |
951ed4d3 | 635 | |
3fdb14fd | 636 | } while (read_seqcount_retry(&tk_core.seq, seq)); |
24e4a8c3 | 637 | |
a016a5bd | 638 | return ktime_add_ns(base, nsecs); |
951ed4d3 MS |
639 | } |
640 | EXPORT_SYMBOL_GPL(ktime_get); | |
641 | ||
0077dc60 TG |
642 | static ktime_t *offsets[TK_OFFS_MAX] = { |
643 | [TK_OFFS_REAL] = &tk_core.timekeeper.offs_real, | |
644 | [TK_OFFS_BOOT] = &tk_core.timekeeper.offs_boot, | |
645 | [TK_OFFS_TAI] = &tk_core.timekeeper.offs_tai, | |
646 | }; | |
647 | ||
648 | ktime_t ktime_get_with_offset(enum tk_offsets offs) | |
649 | { | |
650 | struct timekeeper *tk = &tk_core.timekeeper; | |
651 | unsigned int seq; | |
652 | ktime_t base, *offset = offsets[offs]; | |
653 | s64 nsecs; | |
654 | ||
655 | WARN_ON(timekeeping_suspended); | |
656 | ||
657 | do { | |
658 | seq = read_seqcount_begin(&tk_core.seq); | |
d28ede83 | 659 | base = ktime_add(tk->tkr.base_mono, *offset); |
0e5ac3a8 | 660 | nsecs = timekeeping_get_ns(&tk->tkr); |
0077dc60 TG |
661 | |
662 | } while (read_seqcount_retry(&tk_core.seq, seq)); | |
663 | ||
664 | return ktime_add_ns(base, nsecs); | |
665 | ||
666 | } | |
667 | EXPORT_SYMBOL_GPL(ktime_get_with_offset); | |
668 | ||
9a6b5197 TG |
669 | /** |
670 | * ktime_mono_to_any() - convert mononotic time to any other time | |
671 | * @tmono: time to convert. | |
672 | * @offs: which offset to use | |
673 | */ | |
674 | ktime_t ktime_mono_to_any(ktime_t tmono, enum tk_offsets offs) | |
675 | { | |
676 | ktime_t *offset = offsets[offs]; | |
677 | unsigned long seq; | |
678 | ktime_t tconv; | |
679 | ||
680 | do { | |
681 | seq = read_seqcount_begin(&tk_core.seq); | |
682 | tconv = ktime_add(tmono, *offset); | |
683 | } while (read_seqcount_retry(&tk_core.seq, seq)); | |
684 | ||
685 | return tconv; | |
686 | } | |
687 | EXPORT_SYMBOL_GPL(ktime_mono_to_any); | |
688 | ||
f519b1a2 TG |
689 | /** |
690 | * ktime_get_raw - Returns the raw monotonic time in ktime_t format | |
691 | */ | |
692 | ktime_t ktime_get_raw(void) | |
693 | { | |
694 | struct timekeeper *tk = &tk_core.timekeeper; | |
695 | unsigned int seq; | |
696 | ktime_t base; | |
697 | s64 nsecs; | |
698 | ||
699 | do { | |
700 | seq = read_seqcount_begin(&tk_core.seq); | |
701 | base = tk->base_raw; | |
702 | nsecs = timekeeping_get_ns_raw(tk); | |
703 | ||
704 | } while (read_seqcount_retry(&tk_core.seq, seq)); | |
705 | ||
706 | return ktime_add_ns(base, nsecs); | |
707 | } | |
708 | EXPORT_SYMBOL_GPL(ktime_get_raw); | |
709 | ||
951ed4d3 | 710 | /** |
d6d29896 | 711 | * ktime_get_ts64 - get the monotonic clock in timespec64 format |
951ed4d3 MS |
712 | * @ts: pointer to timespec variable |
713 | * | |
714 | * The function calculates the monotonic clock from the realtime | |
715 | * clock and the wall_to_monotonic offset and stores the result | |
5322e4c2 | 716 | * in normalized timespec64 format in the variable pointed to by @ts. |
951ed4d3 | 717 | */ |
d6d29896 | 718 | void ktime_get_ts64(struct timespec64 *ts) |
951ed4d3 | 719 | { |
3fdb14fd | 720 | struct timekeeper *tk = &tk_core.timekeeper; |
d6d29896 | 721 | struct timespec64 tomono; |
ec145bab | 722 | s64 nsec; |
951ed4d3 | 723 | unsigned int seq; |
951ed4d3 MS |
724 | |
725 | WARN_ON(timekeeping_suspended); | |
726 | ||
727 | do { | |
3fdb14fd | 728 | seq = read_seqcount_begin(&tk_core.seq); |
d6d29896 | 729 | ts->tv_sec = tk->xtime_sec; |
0e5ac3a8 | 730 | nsec = timekeeping_get_ns(&tk->tkr); |
4e250fdd | 731 | tomono = tk->wall_to_monotonic; |
951ed4d3 | 732 | |
3fdb14fd | 733 | } while (read_seqcount_retry(&tk_core.seq, seq)); |
951ed4d3 | 734 | |
d6d29896 TG |
735 | ts->tv_sec += tomono.tv_sec; |
736 | ts->tv_nsec = 0; | |
737 | timespec64_add_ns(ts, nsec + tomono.tv_nsec); | |
951ed4d3 | 738 | } |
d6d29896 | 739 | EXPORT_SYMBOL_GPL(ktime_get_ts64); |
951ed4d3 | 740 | |
9e3680b1 HS |
741 | /** |
742 | * ktime_get_seconds - Get the seconds portion of CLOCK_MONOTONIC | |
743 | * | |
744 | * Returns the seconds portion of CLOCK_MONOTONIC with a single non | |
745 | * serialized read. tk->ktime_sec is of type 'unsigned long' so this | |
746 | * works on both 32 and 64 bit systems. On 32 bit systems the readout | |
747 | * covers ~136 years of uptime which should be enough to prevent | |
748 | * premature wrap arounds. | |
749 | */ | |
750 | time64_t ktime_get_seconds(void) | |
751 | { | |
752 | struct timekeeper *tk = &tk_core.timekeeper; | |
753 | ||
754 | WARN_ON(timekeeping_suspended); | |
755 | return tk->ktime_sec; | |
756 | } | |
757 | EXPORT_SYMBOL_GPL(ktime_get_seconds); | |
758 | ||
dbe7aa62 HS |
759 | /** |
760 | * ktime_get_real_seconds - Get the seconds portion of CLOCK_REALTIME | |
761 | * | |
762 | * Returns the wall clock seconds since 1970. This replaces the | |
763 | * get_seconds() interface which is not y2038 safe on 32bit systems. | |
764 | * | |
765 | * For 64bit systems the fast access to tk->xtime_sec is preserved. On | |
766 | * 32bit systems the access must be protected with the sequence | |
767 | * counter to provide "atomic" access to the 64bit tk->xtime_sec | |
768 | * value. | |
769 | */ | |
770 | time64_t ktime_get_real_seconds(void) | |
771 | { | |
772 | struct timekeeper *tk = &tk_core.timekeeper; | |
773 | time64_t seconds; | |
774 | unsigned int seq; | |
775 | ||
776 | if (IS_ENABLED(CONFIG_64BIT)) | |
777 | return tk->xtime_sec; | |
778 | ||
779 | do { | |
780 | seq = read_seqcount_begin(&tk_core.seq); | |
781 | seconds = tk->xtime_sec; | |
782 | ||
783 | } while (read_seqcount_retry(&tk_core.seq, seq)); | |
784 | ||
785 | return seconds; | |
786 | } | |
787 | EXPORT_SYMBOL_GPL(ktime_get_real_seconds); | |
788 | ||
e2c18e49 AG |
789 | #ifdef CONFIG_NTP_PPS |
790 | ||
791 | /** | |
792 | * getnstime_raw_and_real - get day and raw monotonic time in timespec format | |
793 | * @ts_raw: pointer to the timespec to be set to raw monotonic time | |
794 | * @ts_real: pointer to the timespec to be set to the time of day | |
795 | * | |
796 | * This function reads both the time of day and raw monotonic time at the | |
797 | * same time atomically and stores the resulting timestamps in timespec | |
798 | * format. | |
799 | */ | |
800 | void getnstime_raw_and_real(struct timespec *ts_raw, struct timespec *ts_real) | |
801 | { | |
3fdb14fd | 802 | struct timekeeper *tk = &tk_core.timekeeper; |
e2c18e49 AG |
803 | unsigned long seq; |
804 | s64 nsecs_raw, nsecs_real; | |
805 | ||
806 | WARN_ON_ONCE(timekeeping_suspended); | |
807 | ||
808 | do { | |
3fdb14fd | 809 | seq = read_seqcount_begin(&tk_core.seq); |
e2c18e49 | 810 | |
7d489d15 | 811 | *ts_raw = timespec64_to_timespec(tk->raw_time); |
4e250fdd | 812 | ts_real->tv_sec = tk->xtime_sec; |
1e75fa8b | 813 | ts_real->tv_nsec = 0; |
e2c18e49 | 814 | |
4e250fdd | 815 | nsecs_raw = timekeeping_get_ns_raw(tk); |
0e5ac3a8 | 816 | nsecs_real = timekeeping_get_ns(&tk->tkr); |
e2c18e49 | 817 | |
3fdb14fd | 818 | } while (read_seqcount_retry(&tk_core.seq, seq)); |
e2c18e49 AG |
819 | |
820 | timespec_add_ns(ts_raw, nsecs_raw); | |
821 | timespec_add_ns(ts_real, nsecs_real); | |
822 | } | |
823 | EXPORT_SYMBOL(getnstime_raw_and_real); | |
824 | ||
825 | #endif /* CONFIG_NTP_PPS */ | |
826 | ||
8524070b | 827 | /** |
828 | * do_gettimeofday - Returns the time of day in a timeval | |
829 | * @tv: pointer to the timeval to be set | |
830 | * | |
efd9ac86 | 831 | * NOTE: Users should be converted to using getnstimeofday() |
8524070b | 832 | */ |
833 | void do_gettimeofday(struct timeval *tv) | |
834 | { | |
d6d29896 | 835 | struct timespec64 now; |
8524070b | 836 | |
d6d29896 | 837 | getnstimeofday64(&now); |
8524070b | 838 | tv->tv_sec = now.tv_sec; |
839 | tv->tv_usec = now.tv_nsec/1000; | |
840 | } | |
8524070b | 841 | EXPORT_SYMBOL(do_gettimeofday); |
d239f49d | 842 | |
8524070b | 843 | /** |
21f7eca5 | 844 | * do_settimeofday64 - Sets the time of day. |
845 | * @ts: pointer to the timespec64 variable containing the new time | |
8524070b | 846 | * |
847 | * Sets the time of day to the new time and update NTP and notify hrtimers | |
848 | */ | |
21f7eca5 | 849 | int do_settimeofday64(const struct timespec64 *ts) |
8524070b | 850 | { |
3fdb14fd | 851 | struct timekeeper *tk = &tk_core.timekeeper; |
21f7eca5 | 852 | struct timespec64 ts_delta, xt; |
92c1d3ed | 853 | unsigned long flags; |
8524070b | 854 | |
21f7eca5 | 855 | if (!timespec64_valid_strict(ts)) |
8524070b | 856 | return -EINVAL; |
857 | ||
9a7a71b1 | 858 | raw_spin_lock_irqsave(&timekeeper_lock, flags); |
3fdb14fd | 859 | write_seqcount_begin(&tk_core.seq); |
8524070b | 860 | |
4e250fdd | 861 | timekeeping_forward_now(tk); |
9a055117 | 862 | |
4e250fdd | 863 | xt = tk_xtime(tk); |
21f7eca5 | 864 | ts_delta.tv_sec = ts->tv_sec - xt.tv_sec; |
865 | ts_delta.tv_nsec = ts->tv_nsec - xt.tv_nsec; | |
1e75fa8b | 866 | |
7d489d15 | 867 | tk_set_wall_to_mono(tk, timespec64_sub(tk->wall_to_monotonic, ts_delta)); |
8524070b | 868 | |
21f7eca5 | 869 | tk_set_xtime(tk, ts); |
1e75fa8b | 870 | |
780427f0 | 871 | timekeeping_update(tk, TK_CLEAR_NTP | TK_MIRROR | TK_CLOCK_WAS_SET); |
8524070b | 872 | |
3fdb14fd | 873 | write_seqcount_end(&tk_core.seq); |
9a7a71b1 | 874 | raw_spin_unlock_irqrestore(&timekeeper_lock, flags); |
8524070b | 875 | |
876 | /* signal hrtimers about time change */ | |
877 | clock_was_set(); | |
878 | ||
879 | return 0; | |
880 | } | |
21f7eca5 | 881 | EXPORT_SYMBOL(do_settimeofday64); |
8524070b | 882 | |
c528f7c6 JS |
883 | /** |
884 | * timekeeping_inject_offset - Adds or subtracts from the current time. | |
885 | * @tv: pointer to the timespec variable containing the offset | |
886 | * | |
887 | * Adds or subtracts an offset value from the current time. | |
888 | */ | |
889 | int timekeeping_inject_offset(struct timespec *ts) | |
890 | { | |
3fdb14fd | 891 | struct timekeeper *tk = &tk_core.timekeeper; |
92c1d3ed | 892 | unsigned long flags; |
7d489d15 | 893 | struct timespec64 ts64, tmp; |
4e8b1452 | 894 | int ret = 0; |
c528f7c6 JS |
895 | |
896 | if ((unsigned long)ts->tv_nsec >= NSEC_PER_SEC) | |
897 | return -EINVAL; | |
898 | ||
7d489d15 JS |
899 | ts64 = timespec_to_timespec64(*ts); |
900 | ||
9a7a71b1 | 901 | raw_spin_lock_irqsave(&timekeeper_lock, flags); |
3fdb14fd | 902 | write_seqcount_begin(&tk_core.seq); |
c528f7c6 | 903 | |
4e250fdd | 904 | timekeeping_forward_now(tk); |
c528f7c6 | 905 | |
4e8b1452 | 906 | /* Make sure the proposed value is valid */ |
7d489d15 JS |
907 | tmp = timespec64_add(tk_xtime(tk), ts64); |
908 | if (!timespec64_valid_strict(&tmp)) { | |
4e8b1452 JS |
909 | ret = -EINVAL; |
910 | goto error; | |
911 | } | |
1e75fa8b | 912 | |
7d489d15 JS |
913 | tk_xtime_add(tk, &ts64); |
914 | tk_set_wall_to_mono(tk, timespec64_sub(tk->wall_to_monotonic, ts64)); | |
c528f7c6 | 915 | |
4e8b1452 | 916 | error: /* even if we error out, we forwarded the time, so call update */ |
780427f0 | 917 | timekeeping_update(tk, TK_CLEAR_NTP | TK_MIRROR | TK_CLOCK_WAS_SET); |
c528f7c6 | 918 | |
3fdb14fd | 919 | write_seqcount_end(&tk_core.seq); |
9a7a71b1 | 920 | raw_spin_unlock_irqrestore(&timekeeper_lock, flags); |
c528f7c6 JS |
921 | |
922 | /* signal hrtimers about time change */ | |
923 | clock_was_set(); | |
924 | ||
4e8b1452 | 925 | return ret; |
c528f7c6 JS |
926 | } |
927 | EXPORT_SYMBOL(timekeeping_inject_offset); | |
928 | ||
cc244dda JS |
929 | |
930 | /** | |
931 | * timekeeping_get_tai_offset - Returns current TAI offset from UTC | |
932 | * | |
933 | */ | |
934 | s32 timekeeping_get_tai_offset(void) | |
935 | { | |
3fdb14fd | 936 | struct timekeeper *tk = &tk_core.timekeeper; |
cc244dda JS |
937 | unsigned int seq; |
938 | s32 ret; | |
939 | ||
940 | do { | |
3fdb14fd | 941 | seq = read_seqcount_begin(&tk_core.seq); |
cc244dda | 942 | ret = tk->tai_offset; |
3fdb14fd | 943 | } while (read_seqcount_retry(&tk_core.seq, seq)); |
cc244dda JS |
944 | |
945 | return ret; | |
946 | } | |
947 | ||
948 | /** | |
949 | * __timekeeping_set_tai_offset - Lock free worker function | |
950 | * | |
951 | */ | |
dd5d70e8 | 952 | static void __timekeeping_set_tai_offset(struct timekeeper *tk, s32 tai_offset) |
cc244dda JS |
953 | { |
954 | tk->tai_offset = tai_offset; | |
04005f60 | 955 | tk->offs_tai = ktime_add(tk->offs_real, ktime_set(tai_offset, 0)); |
cc244dda JS |
956 | } |
957 | ||
958 | /** | |
959 | * timekeeping_set_tai_offset - Sets the current TAI offset from UTC | |
960 | * | |
961 | */ | |
962 | void timekeeping_set_tai_offset(s32 tai_offset) | |
963 | { | |
3fdb14fd | 964 | struct timekeeper *tk = &tk_core.timekeeper; |
cc244dda JS |
965 | unsigned long flags; |
966 | ||
9a7a71b1 | 967 | raw_spin_lock_irqsave(&timekeeper_lock, flags); |
3fdb14fd | 968 | write_seqcount_begin(&tk_core.seq); |
cc244dda | 969 | __timekeeping_set_tai_offset(tk, tai_offset); |
f55c0760 | 970 | timekeeping_update(tk, TK_MIRROR | TK_CLOCK_WAS_SET); |
3fdb14fd | 971 | write_seqcount_end(&tk_core.seq); |
9a7a71b1 | 972 | raw_spin_unlock_irqrestore(&timekeeper_lock, flags); |
4e8f8b34 | 973 | clock_was_set(); |
cc244dda JS |
974 | } |
975 | ||
8524070b | 976 | /** |
977 | * change_clocksource - Swaps clocksources if a new one is available | |
978 | * | |
979 | * Accumulates current time interval and initializes new clocksource | |
980 | */ | |
75c5158f | 981 | static int change_clocksource(void *data) |
8524070b | 982 | { |
3fdb14fd | 983 | struct timekeeper *tk = &tk_core.timekeeper; |
4614e6ad | 984 | struct clocksource *new, *old; |
f695cf94 | 985 | unsigned long flags; |
8524070b | 986 | |
75c5158f | 987 | new = (struct clocksource *) data; |
8524070b | 988 | |
9a7a71b1 | 989 | raw_spin_lock_irqsave(&timekeeper_lock, flags); |
3fdb14fd | 990 | write_seqcount_begin(&tk_core.seq); |
f695cf94 | 991 | |
4e250fdd | 992 | timekeeping_forward_now(tk); |
09ac369c TG |
993 | /* |
994 | * If the cs is in module, get a module reference. Succeeds | |
995 | * for built-in code (owner == NULL) as well. | |
996 | */ | |
997 | if (try_module_get(new->owner)) { | |
998 | if (!new->enable || new->enable(new) == 0) { | |
d28ede83 | 999 | old = tk->tkr.clock; |
09ac369c TG |
1000 | tk_setup_internals(tk, new); |
1001 | if (old->disable) | |
1002 | old->disable(old); | |
1003 | module_put(old->owner); | |
1004 | } else { | |
1005 | module_put(new->owner); | |
1006 | } | |
75c5158f | 1007 | } |
780427f0 | 1008 | timekeeping_update(tk, TK_CLEAR_NTP | TK_MIRROR | TK_CLOCK_WAS_SET); |
f695cf94 | 1009 | |
3fdb14fd | 1010 | write_seqcount_end(&tk_core.seq); |
9a7a71b1 | 1011 | raw_spin_unlock_irqrestore(&timekeeper_lock, flags); |
f695cf94 | 1012 | |
75c5158f MS |
1013 | return 0; |
1014 | } | |
8524070b | 1015 | |
75c5158f MS |
1016 | /** |
1017 | * timekeeping_notify - Install a new clock source | |
1018 | * @clock: pointer to the clock source | |
1019 | * | |
1020 | * This function is called from clocksource.c after a new, better clock | |
1021 | * source has been registered. The caller holds the clocksource_mutex. | |
1022 | */ | |
ba919d1c | 1023 | int timekeeping_notify(struct clocksource *clock) |
75c5158f | 1024 | { |
3fdb14fd | 1025 | struct timekeeper *tk = &tk_core.timekeeper; |
4e250fdd | 1026 | |
d28ede83 | 1027 | if (tk->tkr.clock == clock) |
ba919d1c | 1028 | return 0; |
75c5158f | 1029 | stop_machine(change_clocksource, clock, NULL); |
8524070b | 1030 | tick_clock_notify(); |
d28ede83 | 1031 | return tk->tkr.clock == clock ? 0 : -1; |
8524070b | 1032 | } |
75c5158f | 1033 | |
2d42244a | 1034 | /** |
cdba2ec5 JS |
1035 | * getrawmonotonic64 - Returns the raw monotonic time in a timespec |
1036 | * @ts: pointer to the timespec64 to be set | |
2d42244a JS |
1037 | * |
1038 | * Returns the raw monotonic time (completely un-modified by ntp) | |
1039 | */ | |
cdba2ec5 | 1040 | void getrawmonotonic64(struct timespec64 *ts) |
2d42244a | 1041 | { |
3fdb14fd | 1042 | struct timekeeper *tk = &tk_core.timekeeper; |
7d489d15 | 1043 | struct timespec64 ts64; |
2d42244a JS |
1044 | unsigned long seq; |
1045 | s64 nsecs; | |
2d42244a JS |
1046 | |
1047 | do { | |
3fdb14fd | 1048 | seq = read_seqcount_begin(&tk_core.seq); |
4e250fdd | 1049 | nsecs = timekeeping_get_ns_raw(tk); |
7d489d15 | 1050 | ts64 = tk->raw_time; |
2d42244a | 1051 | |
3fdb14fd | 1052 | } while (read_seqcount_retry(&tk_core.seq, seq)); |
2d42244a | 1053 | |
7d489d15 | 1054 | timespec64_add_ns(&ts64, nsecs); |
cdba2ec5 | 1055 | *ts = ts64; |
2d42244a | 1056 | } |
cdba2ec5 JS |
1057 | EXPORT_SYMBOL(getrawmonotonic64); |
1058 | ||
2d42244a | 1059 | |
8524070b | 1060 | /** |
cf4fc6cb | 1061 | * timekeeping_valid_for_hres - Check if timekeeping is suitable for hres |
8524070b | 1062 | */ |
cf4fc6cb | 1063 | int timekeeping_valid_for_hres(void) |
8524070b | 1064 | { |
3fdb14fd | 1065 | struct timekeeper *tk = &tk_core.timekeeper; |
8524070b | 1066 | unsigned long seq; |
1067 | int ret; | |
1068 | ||
1069 | do { | |
3fdb14fd | 1070 | seq = read_seqcount_begin(&tk_core.seq); |
8524070b | 1071 | |
d28ede83 | 1072 | ret = tk->tkr.clock->flags & CLOCK_SOURCE_VALID_FOR_HRES; |
8524070b | 1073 | |
3fdb14fd | 1074 | } while (read_seqcount_retry(&tk_core.seq, seq)); |
8524070b | 1075 | |
1076 | return ret; | |
1077 | } | |
1078 | ||
98962465 JH |
1079 | /** |
1080 | * timekeeping_max_deferment - Returns max time the clocksource can be deferred | |
98962465 JH |
1081 | */ |
1082 | u64 timekeeping_max_deferment(void) | |
1083 | { | |
3fdb14fd | 1084 | struct timekeeper *tk = &tk_core.timekeeper; |
70471f2f JS |
1085 | unsigned long seq; |
1086 | u64 ret; | |
42e71e81 | 1087 | |
70471f2f | 1088 | do { |
3fdb14fd | 1089 | seq = read_seqcount_begin(&tk_core.seq); |
70471f2f | 1090 | |
d28ede83 | 1091 | ret = tk->tkr.clock->max_idle_ns; |
70471f2f | 1092 | |
3fdb14fd | 1093 | } while (read_seqcount_retry(&tk_core.seq, seq)); |
70471f2f JS |
1094 | |
1095 | return ret; | |
98962465 JH |
1096 | } |
1097 | ||
8524070b | 1098 | /** |
d4f587c6 | 1099 | * read_persistent_clock - Return time from the persistent clock. |
8524070b | 1100 | * |
1101 | * Weak dummy function for arches that do not yet support it. | |
d4f587c6 MS |
1102 | * Reads the time from the battery backed persistent clock. |
1103 | * Returns a timespec with tv_sec=0 and tv_nsec=0 if unsupported. | |
8524070b | 1104 | * |
1105 | * XXX - Do be sure to remove it once all arches implement it. | |
1106 | */ | |
52f5684c | 1107 | void __weak read_persistent_clock(struct timespec *ts) |
8524070b | 1108 | { |
d4f587c6 MS |
1109 | ts->tv_sec = 0; |
1110 | ts->tv_nsec = 0; | |
8524070b | 1111 | } |
1112 | ||
23970e38 MS |
1113 | /** |
1114 | * read_boot_clock - Return time of the system start. | |
1115 | * | |
1116 | * Weak dummy function for arches that do not yet support it. | |
1117 | * Function to read the exact time the system has been started. | |
1118 | * Returns a timespec with tv_sec=0 and tv_nsec=0 if unsupported. | |
1119 | * | |
1120 | * XXX - Do be sure to remove it once all arches implement it. | |
1121 | */ | |
52f5684c | 1122 | void __weak read_boot_clock(struct timespec *ts) |
23970e38 MS |
1123 | { |
1124 | ts->tv_sec = 0; | |
1125 | ts->tv_nsec = 0; | |
1126 | } | |
1127 | ||
8524070b | 1128 | /* |
1129 | * timekeeping_init - Initializes the clocksource and common timekeeping values | |
1130 | */ | |
1131 | void __init timekeeping_init(void) | |
1132 | { | |
3fdb14fd | 1133 | struct timekeeper *tk = &tk_core.timekeeper; |
155ec602 | 1134 | struct clocksource *clock; |
8524070b | 1135 | unsigned long flags; |
7d489d15 JS |
1136 | struct timespec64 now, boot, tmp; |
1137 | struct timespec ts; | |
31ade306 | 1138 | |
7d489d15 JS |
1139 | read_persistent_clock(&ts); |
1140 | now = timespec_to_timespec64(ts); | |
1141 | if (!timespec64_valid_strict(&now)) { | |
4e8b1452 JS |
1142 | pr_warn("WARNING: Persistent clock returned invalid value!\n" |
1143 | " Check your CMOS/BIOS settings.\n"); | |
1144 | now.tv_sec = 0; | |
1145 | now.tv_nsec = 0; | |
31ade306 FT |
1146 | } else if (now.tv_sec || now.tv_nsec) |
1147 | persistent_clock_exist = true; | |
4e8b1452 | 1148 | |
7d489d15 JS |
1149 | read_boot_clock(&ts); |
1150 | boot = timespec_to_timespec64(ts); | |
1151 | if (!timespec64_valid_strict(&boot)) { | |
4e8b1452 JS |
1152 | pr_warn("WARNING: Boot clock returned invalid value!\n" |
1153 | " Check your CMOS/BIOS settings.\n"); | |
1154 | boot.tv_sec = 0; | |
1155 | boot.tv_nsec = 0; | |
1156 | } | |
8524070b | 1157 | |
9a7a71b1 | 1158 | raw_spin_lock_irqsave(&timekeeper_lock, flags); |
3fdb14fd | 1159 | write_seqcount_begin(&tk_core.seq); |
06c017fd JS |
1160 | ntp_init(); |
1161 | ||
f1b82746 | 1162 | clock = clocksource_default_clock(); |
a0f7d48b MS |
1163 | if (clock->enable) |
1164 | clock->enable(clock); | |
4e250fdd | 1165 | tk_setup_internals(tk, clock); |
8524070b | 1166 | |
4e250fdd JS |
1167 | tk_set_xtime(tk, &now); |
1168 | tk->raw_time.tv_sec = 0; | |
1169 | tk->raw_time.tv_nsec = 0; | |
f519b1a2 | 1170 | tk->base_raw.tv64 = 0; |
1e75fa8b | 1171 | if (boot.tv_sec == 0 && boot.tv_nsec == 0) |
4e250fdd | 1172 | boot = tk_xtime(tk); |
1e75fa8b | 1173 | |
7d489d15 | 1174 | set_normalized_timespec64(&tmp, -boot.tv_sec, -boot.tv_nsec); |
4e250fdd | 1175 | tk_set_wall_to_mono(tk, tmp); |
6d0ef903 | 1176 | |
f111adfd | 1177 | timekeeping_update(tk, TK_MIRROR); |
48cdc135 | 1178 | |
3fdb14fd | 1179 | write_seqcount_end(&tk_core.seq); |
9a7a71b1 | 1180 | raw_spin_unlock_irqrestore(&timekeeper_lock, flags); |
8524070b | 1181 | } |
1182 | ||
8524070b | 1183 | /* time in seconds when suspend began */ |
7d489d15 | 1184 | static struct timespec64 timekeeping_suspend_time; |
8524070b | 1185 | |
304529b1 JS |
1186 | /** |
1187 | * __timekeeping_inject_sleeptime - Internal function to add sleep interval | |
1188 | * @delta: pointer to a timespec delta value | |
1189 | * | |
1190 | * Takes a timespec offset measuring a suspend interval and properly | |
1191 | * adds the sleep offset to the timekeeping variables. | |
1192 | */ | |
f726a697 | 1193 | static void __timekeeping_inject_sleeptime(struct timekeeper *tk, |
7d489d15 | 1194 | struct timespec64 *delta) |
304529b1 | 1195 | { |
7d489d15 | 1196 | if (!timespec64_valid_strict(delta)) { |
6d9bcb62 JS |
1197 | printk_deferred(KERN_WARNING |
1198 | "__timekeeping_inject_sleeptime: Invalid " | |
1199 | "sleep delta value!\n"); | |
cb5de2f8 JS |
1200 | return; |
1201 | } | |
f726a697 | 1202 | tk_xtime_add(tk, delta); |
7d489d15 | 1203 | tk_set_wall_to_mono(tk, timespec64_sub(tk->wall_to_monotonic, *delta)); |
47da70d3 | 1204 | tk_update_sleep_time(tk, timespec64_to_ktime(*delta)); |
5c83545f | 1205 | tk_debug_account_sleep_time(delta); |
304529b1 JS |
1206 | } |
1207 | ||
304529b1 | 1208 | /** |
04d90890 | 1209 | * timekeeping_inject_sleeptime64 - Adds suspend interval to timeekeeping values |
1210 | * @delta: pointer to a timespec64 delta value | |
304529b1 JS |
1211 | * |
1212 | * This hook is for architectures that cannot support read_persistent_clock | |
1213 | * because their RTC/persistent clock is only accessible when irqs are enabled. | |
1214 | * | |
1215 | * This function should only be called by rtc_resume(), and allows | |
1216 | * a suspend offset to be injected into the timekeeping values. | |
1217 | */ | |
04d90890 | 1218 | void timekeeping_inject_sleeptime64(struct timespec64 *delta) |
304529b1 | 1219 | { |
3fdb14fd | 1220 | struct timekeeper *tk = &tk_core.timekeeper; |
92c1d3ed | 1221 | unsigned long flags; |
304529b1 | 1222 | |
31ade306 FT |
1223 | /* |
1224 | * Make sure we don't set the clock twice, as timekeeping_resume() | |
1225 | * already did it | |
1226 | */ | |
1227 | if (has_persistent_clock()) | |
304529b1 JS |
1228 | return; |
1229 | ||
9a7a71b1 | 1230 | raw_spin_lock_irqsave(&timekeeper_lock, flags); |
3fdb14fd | 1231 | write_seqcount_begin(&tk_core.seq); |
70471f2f | 1232 | |
4e250fdd | 1233 | timekeeping_forward_now(tk); |
304529b1 | 1234 | |
04d90890 | 1235 | __timekeeping_inject_sleeptime(tk, delta); |
304529b1 | 1236 | |
780427f0 | 1237 | timekeeping_update(tk, TK_CLEAR_NTP | TK_MIRROR | TK_CLOCK_WAS_SET); |
304529b1 | 1238 | |
3fdb14fd | 1239 | write_seqcount_end(&tk_core.seq); |
9a7a71b1 | 1240 | raw_spin_unlock_irqrestore(&timekeeper_lock, flags); |
304529b1 JS |
1241 | |
1242 | /* signal hrtimers about time change */ | |
1243 | clock_was_set(); | |
1244 | } | |
1245 | ||
8524070b | 1246 | /** |
1247 | * timekeeping_resume - Resumes the generic timekeeping subsystem. | |
8524070b | 1248 | * |
1249 | * This is for the generic clocksource timekeeping. | |
1250 | * xtime/wall_to_monotonic/jiffies/etc are | |
1251 | * still managed by arch specific suspend/resume code. | |
1252 | */ | |
124cf911 | 1253 | void timekeeping_resume(void) |
8524070b | 1254 | { |
3fdb14fd | 1255 | struct timekeeper *tk = &tk_core.timekeeper; |
d28ede83 | 1256 | struct clocksource *clock = tk->tkr.clock; |
92c1d3ed | 1257 | unsigned long flags; |
7d489d15 JS |
1258 | struct timespec64 ts_new, ts_delta; |
1259 | struct timespec tmp; | |
e445cf1c FT |
1260 | cycle_t cycle_now, cycle_delta; |
1261 | bool suspendtime_found = false; | |
d4f587c6 | 1262 | |
7d489d15 JS |
1263 | read_persistent_clock(&tmp); |
1264 | ts_new = timespec_to_timespec64(tmp); | |
8524070b | 1265 | |
adc78e6b | 1266 | clockevents_resume(); |
d10ff3fb TG |
1267 | clocksource_resume(); |
1268 | ||
9a7a71b1 | 1269 | raw_spin_lock_irqsave(&timekeeper_lock, flags); |
3fdb14fd | 1270 | write_seqcount_begin(&tk_core.seq); |
8524070b | 1271 | |
e445cf1c FT |
1272 | /* |
1273 | * After system resumes, we need to calculate the suspended time and | |
1274 | * compensate it for the OS time. There are 3 sources that could be | |
1275 | * used: Nonstop clocksource during suspend, persistent clock and rtc | |
1276 | * device. | |
1277 | * | |
1278 | * One specific platform may have 1 or 2 or all of them, and the | |
1279 | * preference will be: | |
1280 | * suspend-nonstop clocksource -> persistent clock -> rtc | |
1281 | * The less preferred source will only be tried if there is no better | |
1282 | * usable source. The rtc part is handled separately in rtc core code. | |
1283 | */ | |
d28ede83 | 1284 | cycle_now = tk->tkr.read(clock); |
e445cf1c | 1285 | if ((clock->flags & CLOCK_SOURCE_SUSPEND_NONSTOP) && |
d28ede83 | 1286 | cycle_now > tk->tkr.cycle_last) { |
e445cf1c FT |
1287 | u64 num, max = ULLONG_MAX; |
1288 | u32 mult = clock->mult; | |
1289 | u32 shift = clock->shift; | |
1290 | s64 nsec = 0; | |
1291 | ||
d28ede83 TG |
1292 | cycle_delta = clocksource_delta(cycle_now, tk->tkr.cycle_last, |
1293 | tk->tkr.mask); | |
e445cf1c FT |
1294 | |
1295 | /* | |
1296 | * "cycle_delta * mutl" may cause 64 bits overflow, if the | |
1297 | * suspended time is too long. In that case we need do the | |
1298 | * 64 bits math carefully | |
1299 | */ | |
1300 | do_div(max, mult); | |
1301 | if (cycle_delta > max) { | |
1302 | num = div64_u64(cycle_delta, max); | |
1303 | nsec = (((u64) max * mult) >> shift) * num; | |
1304 | cycle_delta -= num * max; | |
1305 | } | |
1306 | nsec += ((u64) cycle_delta * mult) >> shift; | |
1307 | ||
7d489d15 | 1308 | ts_delta = ns_to_timespec64(nsec); |
e445cf1c | 1309 | suspendtime_found = true; |
7d489d15 JS |
1310 | } else if (timespec64_compare(&ts_new, &timekeeping_suspend_time) > 0) { |
1311 | ts_delta = timespec64_sub(ts_new, timekeeping_suspend_time); | |
e445cf1c | 1312 | suspendtime_found = true; |
8524070b | 1313 | } |
e445cf1c FT |
1314 | |
1315 | if (suspendtime_found) | |
1316 | __timekeeping_inject_sleeptime(tk, &ts_delta); | |
1317 | ||
1318 | /* Re-base the last cycle value */ | |
d28ede83 | 1319 | tk->tkr.cycle_last = cycle_now; |
4e250fdd | 1320 | tk->ntp_error = 0; |
8524070b | 1321 | timekeeping_suspended = 0; |
780427f0 | 1322 | timekeeping_update(tk, TK_MIRROR | TK_CLOCK_WAS_SET); |
3fdb14fd | 1323 | write_seqcount_end(&tk_core.seq); |
9a7a71b1 | 1324 | raw_spin_unlock_irqrestore(&timekeeper_lock, flags); |
8524070b | 1325 | |
1326 | touch_softlockup_watchdog(); | |
1327 | ||
1328 | clockevents_notify(CLOCK_EVT_NOTIFY_RESUME, NULL); | |
1329 | ||
1330 | /* Resume hrtimers */ | |
b12a03ce | 1331 | hrtimers_resume(); |
8524070b | 1332 | } |
1333 | ||
124cf911 | 1334 | int timekeeping_suspend(void) |
8524070b | 1335 | { |
3fdb14fd | 1336 | struct timekeeper *tk = &tk_core.timekeeper; |
92c1d3ed | 1337 | unsigned long flags; |
7d489d15 JS |
1338 | struct timespec64 delta, delta_delta; |
1339 | static struct timespec64 old_delta; | |
1340 | struct timespec tmp; | |
8524070b | 1341 | |
7d489d15 JS |
1342 | read_persistent_clock(&tmp); |
1343 | timekeeping_suspend_time = timespec_to_timespec64(tmp); | |
3be90950 | 1344 | |
0d6bd995 ZM |
1345 | /* |
1346 | * On some systems the persistent_clock can not be detected at | |
1347 | * timekeeping_init by its return value, so if we see a valid | |
1348 | * value returned, update the persistent_clock_exists flag. | |
1349 | */ | |
1350 | if (timekeeping_suspend_time.tv_sec || timekeeping_suspend_time.tv_nsec) | |
1351 | persistent_clock_exist = true; | |
1352 | ||
9a7a71b1 | 1353 | raw_spin_lock_irqsave(&timekeeper_lock, flags); |
3fdb14fd | 1354 | write_seqcount_begin(&tk_core.seq); |
4e250fdd | 1355 | timekeeping_forward_now(tk); |
8524070b | 1356 | timekeeping_suspended = 1; |
cb33217b JS |
1357 | |
1358 | /* | |
1359 | * To avoid drift caused by repeated suspend/resumes, | |
1360 | * which each can add ~1 second drift error, | |
1361 | * try to compensate so the difference in system time | |
1362 | * and persistent_clock time stays close to constant. | |
1363 | */ | |
7d489d15 JS |
1364 | delta = timespec64_sub(tk_xtime(tk), timekeeping_suspend_time); |
1365 | delta_delta = timespec64_sub(delta, old_delta); | |
cb33217b JS |
1366 | if (abs(delta_delta.tv_sec) >= 2) { |
1367 | /* | |
1368 | * if delta_delta is too large, assume time correction | |
1369 | * has occured and set old_delta to the current delta. | |
1370 | */ | |
1371 | old_delta = delta; | |
1372 | } else { | |
1373 | /* Otherwise try to adjust old_system to compensate */ | |
1374 | timekeeping_suspend_time = | |
7d489d15 | 1375 | timespec64_add(timekeeping_suspend_time, delta_delta); |
cb33217b | 1376 | } |
330a1617 JS |
1377 | |
1378 | timekeeping_update(tk, TK_MIRROR); | |
060407ae | 1379 | halt_fast_timekeeper(tk); |
3fdb14fd | 1380 | write_seqcount_end(&tk_core.seq); |
9a7a71b1 | 1381 | raw_spin_unlock_irqrestore(&timekeeper_lock, flags); |
8524070b | 1382 | |
1383 | clockevents_notify(CLOCK_EVT_NOTIFY_SUSPEND, NULL); | |
c54a42b1 | 1384 | clocksource_suspend(); |
adc78e6b | 1385 | clockevents_suspend(); |
8524070b | 1386 | |
1387 | return 0; | |
1388 | } | |
1389 | ||
1390 | /* sysfs resume/suspend bits for timekeeping */ | |
e1a85b2c | 1391 | static struct syscore_ops timekeeping_syscore_ops = { |
8524070b | 1392 | .resume = timekeeping_resume, |
1393 | .suspend = timekeeping_suspend, | |
8524070b | 1394 | }; |
1395 | ||
e1a85b2c | 1396 | static int __init timekeeping_init_ops(void) |
8524070b | 1397 | { |
e1a85b2c RW |
1398 | register_syscore_ops(&timekeeping_syscore_ops); |
1399 | return 0; | |
8524070b | 1400 | } |
e1a85b2c | 1401 | device_initcall(timekeeping_init_ops); |
8524070b | 1402 | |
1403 | /* | |
dc491596 | 1404 | * Apply a multiplier adjustment to the timekeeper |
8524070b | 1405 | */ |
dc491596 JS |
1406 | static __always_inline void timekeeping_apply_adjustment(struct timekeeper *tk, |
1407 | s64 offset, | |
1408 | bool negative, | |
1409 | int adj_scale) | |
8524070b | 1410 | { |
dc491596 JS |
1411 | s64 interval = tk->cycle_interval; |
1412 | s32 mult_adj = 1; | |
8524070b | 1413 | |
dc491596 JS |
1414 | if (negative) { |
1415 | mult_adj = -mult_adj; | |
1416 | interval = -interval; | |
1417 | offset = -offset; | |
1d17d174 | 1418 | } |
dc491596 JS |
1419 | mult_adj <<= adj_scale; |
1420 | interval <<= adj_scale; | |
1421 | offset <<= adj_scale; | |
8524070b | 1422 | |
c2bc1111 JS |
1423 | /* |
1424 | * So the following can be confusing. | |
1425 | * | |
dc491596 | 1426 | * To keep things simple, lets assume mult_adj == 1 for now. |
c2bc1111 | 1427 | * |
dc491596 | 1428 | * When mult_adj != 1, remember that the interval and offset values |
c2bc1111 JS |
1429 | * have been appropriately scaled so the math is the same. |
1430 | * | |
1431 | * The basic idea here is that we're increasing the multiplier | |
1432 | * by one, this causes the xtime_interval to be incremented by | |
1433 | * one cycle_interval. This is because: | |
1434 | * xtime_interval = cycle_interval * mult | |
1435 | * So if mult is being incremented by one: | |
1436 | * xtime_interval = cycle_interval * (mult + 1) | |
1437 | * Its the same as: | |
1438 | * xtime_interval = (cycle_interval * mult) + cycle_interval | |
1439 | * Which can be shortened to: | |
1440 | * xtime_interval += cycle_interval | |
1441 | * | |
1442 | * So offset stores the non-accumulated cycles. Thus the current | |
1443 | * time (in shifted nanoseconds) is: | |
1444 | * now = (offset * adj) + xtime_nsec | |
1445 | * Now, even though we're adjusting the clock frequency, we have | |
1446 | * to keep time consistent. In other words, we can't jump back | |
1447 | * in time, and we also want to avoid jumping forward in time. | |
1448 | * | |
1449 | * So given the same offset value, we need the time to be the same | |
1450 | * both before and after the freq adjustment. | |
1451 | * now = (offset * adj_1) + xtime_nsec_1 | |
1452 | * now = (offset * adj_2) + xtime_nsec_2 | |
1453 | * So: | |
1454 | * (offset * adj_1) + xtime_nsec_1 = | |
1455 | * (offset * adj_2) + xtime_nsec_2 | |
1456 | * And we know: | |
1457 | * adj_2 = adj_1 + 1 | |
1458 | * So: | |
1459 | * (offset * adj_1) + xtime_nsec_1 = | |
1460 | * (offset * (adj_1+1)) + xtime_nsec_2 | |
1461 | * (offset * adj_1) + xtime_nsec_1 = | |
1462 | * (offset * adj_1) + offset + xtime_nsec_2 | |
1463 | * Canceling the sides: | |
1464 | * xtime_nsec_1 = offset + xtime_nsec_2 | |
1465 | * Which gives us: | |
1466 | * xtime_nsec_2 = xtime_nsec_1 - offset | |
1467 | * Which simplfies to: | |
1468 | * xtime_nsec -= offset | |
1469 | * | |
1470 | * XXX - TODO: Doc ntp_error calculation. | |
1471 | */ | |
cb2aa634 | 1472 | if ((mult_adj > 0) && (tk->tkr.mult + mult_adj < mult_adj)) { |
6067dc5a | 1473 | /* NTP adjustment caused clocksource mult overflow */ |
1474 | WARN_ON_ONCE(1); | |
1475 | return; | |
1476 | } | |
1477 | ||
dc491596 | 1478 | tk->tkr.mult += mult_adj; |
f726a697 | 1479 | tk->xtime_interval += interval; |
d28ede83 | 1480 | tk->tkr.xtime_nsec -= offset; |
f726a697 | 1481 | tk->ntp_error -= (interval - offset) << tk->ntp_error_shift; |
dc491596 JS |
1482 | } |
1483 | ||
1484 | /* | |
1485 | * Calculate the multiplier adjustment needed to match the frequency | |
1486 | * specified by NTP | |
1487 | */ | |
1488 | static __always_inline void timekeeping_freqadjust(struct timekeeper *tk, | |
1489 | s64 offset) | |
1490 | { | |
1491 | s64 interval = tk->cycle_interval; | |
1492 | s64 xinterval = tk->xtime_interval; | |
1493 | s64 tick_error; | |
1494 | bool negative; | |
1495 | u32 adj; | |
1496 | ||
1497 | /* Remove any current error adj from freq calculation */ | |
1498 | if (tk->ntp_err_mult) | |
1499 | xinterval -= tk->cycle_interval; | |
1500 | ||
375f45b5 JS |
1501 | tk->ntp_tick = ntp_tick_length(); |
1502 | ||
dc491596 JS |
1503 | /* Calculate current error per tick */ |
1504 | tick_error = ntp_tick_length() >> tk->ntp_error_shift; | |
1505 | tick_error -= (xinterval + tk->xtime_remainder); | |
1506 | ||
1507 | /* Don't worry about correcting it if its small */ | |
1508 | if (likely((tick_error >= 0) && (tick_error <= interval))) | |
1509 | return; | |
1510 | ||
1511 | /* preserve the direction of correction */ | |
1512 | negative = (tick_error < 0); | |
1513 | ||
1514 | /* Sort out the magnitude of the correction */ | |
1515 | tick_error = abs(tick_error); | |
1516 | for (adj = 0; tick_error > interval; adj++) | |
1517 | tick_error >>= 1; | |
1518 | ||
1519 | /* scale the corrections */ | |
1520 | timekeeping_apply_adjustment(tk, offset, negative, adj); | |
1521 | } | |
1522 | ||
1523 | /* | |
1524 | * Adjust the timekeeper's multiplier to the correct frequency | |
1525 | * and also to reduce the accumulated error value. | |
1526 | */ | |
1527 | static void timekeeping_adjust(struct timekeeper *tk, s64 offset) | |
1528 | { | |
1529 | /* Correct for the current frequency error */ | |
1530 | timekeeping_freqadjust(tk, offset); | |
1531 | ||
1532 | /* Next make a small adjustment to fix any cumulative error */ | |
1533 | if (!tk->ntp_err_mult && (tk->ntp_error > 0)) { | |
1534 | tk->ntp_err_mult = 1; | |
1535 | timekeeping_apply_adjustment(tk, offset, 0, 0); | |
1536 | } else if (tk->ntp_err_mult && (tk->ntp_error <= 0)) { | |
1537 | /* Undo any existing error adjustment */ | |
1538 | timekeeping_apply_adjustment(tk, offset, 1, 0); | |
1539 | tk->ntp_err_mult = 0; | |
1540 | } | |
1541 | ||
1542 | if (unlikely(tk->tkr.clock->maxadj && | |
659bc17b | 1543 | (abs(tk->tkr.mult - tk->tkr.clock->mult) |
1544 | > tk->tkr.clock->maxadj))) { | |
dc491596 JS |
1545 | printk_once(KERN_WARNING |
1546 | "Adjusting %s more than 11%% (%ld vs %ld)\n", | |
1547 | tk->tkr.clock->name, (long)tk->tkr.mult, | |
1548 | (long)tk->tkr.clock->mult + tk->tkr.clock->maxadj); | |
1549 | } | |
2a8c0883 JS |
1550 | |
1551 | /* | |
1552 | * It may be possible that when we entered this function, xtime_nsec | |
1553 | * was very small. Further, if we're slightly speeding the clocksource | |
1554 | * in the code above, its possible the required corrective factor to | |
1555 | * xtime_nsec could cause it to underflow. | |
1556 | * | |
1557 | * Now, since we already accumulated the second, cannot simply roll | |
1558 | * the accumulated second back, since the NTP subsystem has been | |
1559 | * notified via second_overflow. So instead we push xtime_nsec forward | |
1560 | * by the amount we underflowed, and add that amount into the error. | |
1561 | * | |
1562 | * We'll correct this error next time through this function, when | |
1563 | * xtime_nsec is not as small. | |
1564 | */ | |
d28ede83 TG |
1565 | if (unlikely((s64)tk->tkr.xtime_nsec < 0)) { |
1566 | s64 neg = -(s64)tk->tkr.xtime_nsec; | |
1567 | tk->tkr.xtime_nsec = 0; | |
f726a697 | 1568 | tk->ntp_error += neg << tk->ntp_error_shift; |
2a8c0883 | 1569 | } |
8524070b | 1570 | } |
1571 | ||
1f4f9487 JS |
1572 | /** |
1573 | * accumulate_nsecs_to_secs - Accumulates nsecs into secs | |
1574 | * | |
1575 | * Helper function that accumulates a the nsecs greater then a second | |
1576 | * from the xtime_nsec field to the xtime_secs field. | |
1577 | * It also calls into the NTP code to handle leapsecond processing. | |
1578 | * | |
1579 | */ | |
780427f0 | 1580 | static inline unsigned int accumulate_nsecs_to_secs(struct timekeeper *tk) |
1f4f9487 | 1581 | { |
d28ede83 | 1582 | u64 nsecps = (u64)NSEC_PER_SEC << tk->tkr.shift; |
5258d3f2 | 1583 | unsigned int clock_set = 0; |
1f4f9487 | 1584 | |
d28ede83 | 1585 | while (tk->tkr.xtime_nsec >= nsecps) { |
1f4f9487 JS |
1586 | int leap; |
1587 | ||
d28ede83 | 1588 | tk->tkr.xtime_nsec -= nsecps; |
1f4f9487 JS |
1589 | tk->xtime_sec++; |
1590 | ||
1591 | /* Figure out if its a leap sec and apply if needed */ | |
1592 | leap = second_overflow(tk->xtime_sec); | |
6d0ef903 | 1593 | if (unlikely(leap)) { |
7d489d15 | 1594 | struct timespec64 ts; |
6d0ef903 JS |
1595 | |
1596 | tk->xtime_sec += leap; | |
1f4f9487 | 1597 | |
6d0ef903 JS |
1598 | ts.tv_sec = leap; |
1599 | ts.tv_nsec = 0; | |
1600 | tk_set_wall_to_mono(tk, | |
7d489d15 | 1601 | timespec64_sub(tk->wall_to_monotonic, ts)); |
6d0ef903 | 1602 | |
cc244dda JS |
1603 | __timekeeping_set_tai_offset(tk, tk->tai_offset - leap); |
1604 | ||
5258d3f2 | 1605 | clock_set = TK_CLOCK_WAS_SET; |
6d0ef903 | 1606 | } |
1f4f9487 | 1607 | } |
5258d3f2 | 1608 | return clock_set; |
1f4f9487 JS |
1609 | } |
1610 | ||
a092ff0f | 1611 | /** |
1612 | * logarithmic_accumulation - shifted accumulation of cycles | |
1613 | * | |
1614 | * This functions accumulates a shifted interval of cycles into | |
1615 | * into a shifted interval nanoseconds. Allows for O(log) accumulation | |
1616 | * loop. | |
1617 | * | |
1618 | * Returns the unconsumed cycles. | |
1619 | */ | |
f726a697 | 1620 | static cycle_t logarithmic_accumulation(struct timekeeper *tk, cycle_t offset, |
5258d3f2 JS |
1621 | u32 shift, |
1622 | unsigned int *clock_set) | |
a092ff0f | 1623 | { |
23a9537a | 1624 | cycle_t interval = tk->cycle_interval << shift; |
deda2e81 | 1625 | u64 raw_nsecs; |
a092ff0f | 1626 | |
f726a697 | 1627 | /* If the offset is smaller then a shifted interval, do nothing */ |
23a9537a | 1628 | if (offset < interval) |
a092ff0f | 1629 | return offset; |
1630 | ||
1631 | /* Accumulate one shifted interval */ | |
23a9537a | 1632 | offset -= interval; |
d28ede83 | 1633 | tk->tkr.cycle_last += interval; |
a092ff0f | 1634 | |
d28ede83 | 1635 | tk->tkr.xtime_nsec += tk->xtime_interval << shift; |
5258d3f2 | 1636 | *clock_set |= accumulate_nsecs_to_secs(tk); |
a092ff0f | 1637 | |
deda2e81 | 1638 | /* Accumulate raw time */ |
5b3900cd | 1639 | raw_nsecs = (u64)tk->raw_interval << shift; |
f726a697 | 1640 | raw_nsecs += tk->raw_time.tv_nsec; |
c7dcf87a JS |
1641 | if (raw_nsecs >= NSEC_PER_SEC) { |
1642 | u64 raw_secs = raw_nsecs; | |
1643 | raw_nsecs = do_div(raw_secs, NSEC_PER_SEC); | |
f726a697 | 1644 | tk->raw_time.tv_sec += raw_secs; |
a092ff0f | 1645 | } |
f726a697 | 1646 | tk->raw_time.tv_nsec = raw_nsecs; |
a092ff0f | 1647 | |
1648 | /* Accumulate error between NTP and clock interval */ | |
375f45b5 | 1649 | tk->ntp_error += tk->ntp_tick << shift; |
f726a697 JS |
1650 | tk->ntp_error -= (tk->xtime_interval + tk->xtime_remainder) << |
1651 | (tk->ntp_error_shift + shift); | |
a092ff0f | 1652 | |
1653 | return offset; | |
1654 | } | |
1655 | ||
8524070b | 1656 | /** |
1657 | * update_wall_time - Uses the current clocksource to increment the wall time | |
1658 | * | |
8524070b | 1659 | */ |
47a1b796 | 1660 | void update_wall_time(void) |
8524070b | 1661 | { |
3fdb14fd | 1662 | struct timekeeper *real_tk = &tk_core.timekeeper; |
48cdc135 | 1663 | struct timekeeper *tk = &shadow_timekeeper; |
8524070b | 1664 | cycle_t offset; |
a092ff0f | 1665 | int shift = 0, maxshift; |
5258d3f2 | 1666 | unsigned int clock_set = 0; |
70471f2f JS |
1667 | unsigned long flags; |
1668 | ||
9a7a71b1 | 1669 | raw_spin_lock_irqsave(&timekeeper_lock, flags); |
8524070b | 1670 | |
1671 | /* Make sure we're fully resumed: */ | |
1672 | if (unlikely(timekeeping_suspended)) | |
70471f2f | 1673 | goto out; |
8524070b | 1674 | |
592913ec | 1675 | #ifdef CONFIG_ARCH_USES_GETTIMEOFFSET |
48cdc135 | 1676 | offset = real_tk->cycle_interval; |
592913ec | 1677 | #else |
d28ede83 TG |
1678 | offset = clocksource_delta(tk->tkr.read(tk->tkr.clock), |
1679 | tk->tkr.cycle_last, tk->tkr.mask); | |
8524070b | 1680 | #endif |
8524070b | 1681 | |
bf2ac312 | 1682 | /* Check if there's really nothing to do */ |
48cdc135 | 1683 | if (offset < real_tk->cycle_interval) |
bf2ac312 JS |
1684 | goto out; |
1685 | ||
3c17ad19 JS |
1686 | /* Do some additional sanity checking */ |
1687 | timekeeping_check_update(real_tk, offset); | |
1688 | ||
a092ff0f | 1689 | /* |
1690 | * With NO_HZ we may have to accumulate many cycle_intervals | |
1691 | * (think "ticks") worth of time at once. To do this efficiently, | |
1692 | * we calculate the largest doubling multiple of cycle_intervals | |
88b28adf | 1693 | * that is smaller than the offset. We then accumulate that |
a092ff0f | 1694 | * chunk in one go, and then try to consume the next smaller |
1695 | * doubled multiple. | |
8524070b | 1696 | */ |
4e250fdd | 1697 | shift = ilog2(offset) - ilog2(tk->cycle_interval); |
a092ff0f | 1698 | shift = max(0, shift); |
88b28adf | 1699 | /* Bound shift to one less than what overflows tick_length */ |
ea7cf49a | 1700 | maxshift = (64 - (ilog2(ntp_tick_length())+1)) - 1; |
a092ff0f | 1701 | shift = min(shift, maxshift); |
4e250fdd | 1702 | while (offset >= tk->cycle_interval) { |
5258d3f2 JS |
1703 | offset = logarithmic_accumulation(tk, offset, shift, |
1704 | &clock_set); | |
4e250fdd | 1705 | if (offset < tk->cycle_interval<<shift) |
830ec045 | 1706 | shift--; |
8524070b | 1707 | } |
1708 | ||
1709 | /* correct the clock when NTP error is too big */ | |
4e250fdd | 1710 | timekeeping_adjust(tk, offset); |
8524070b | 1711 | |
6a867a39 | 1712 | /* |
92bb1fcf JS |
1713 | * XXX This can be killed once everyone converts |
1714 | * to the new update_vsyscall. | |
1715 | */ | |
1716 | old_vsyscall_fixup(tk); | |
8524070b | 1717 | |
6a867a39 JS |
1718 | /* |
1719 | * Finally, make sure that after the rounding | |
1e75fa8b | 1720 | * xtime_nsec isn't larger than NSEC_PER_SEC |
6a867a39 | 1721 | */ |
5258d3f2 | 1722 | clock_set |= accumulate_nsecs_to_secs(tk); |
83f57a11 | 1723 | |
3fdb14fd | 1724 | write_seqcount_begin(&tk_core.seq); |
48cdc135 TG |
1725 | /* |
1726 | * Update the real timekeeper. | |
1727 | * | |
1728 | * We could avoid this memcpy by switching pointers, but that | |
1729 | * requires changes to all other timekeeper usage sites as | |
1730 | * well, i.e. move the timekeeper pointer getter into the | |
1731 | * spinlocked/seqcount protected sections. And we trade this | |
3fdb14fd | 1732 | * memcpy under the tk_core.seq against one before we start |
48cdc135 TG |
1733 | * updating. |
1734 | */ | |
1735 | memcpy(real_tk, tk, sizeof(*tk)); | |
5258d3f2 | 1736 | timekeeping_update(real_tk, clock_set); |
3fdb14fd | 1737 | write_seqcount_end(&tk_core.seq); |
ca4523cd | 1738 | out: |
9a7a71b1 | 1739 | raw_spin_unlock_irqrestore(&timekeeper_lock, flags); |
47a1b796 | 1740 | if (clock_set) |
cab5e127 JS |
1741 | /* Have to call _delayed version, since in irq context*/ |
1742 | clock_was_set_delayed(); | |
8524070b | 1743 | } |
7c3f1a57 TJ |
1744 | |
1745 | /** | |
d08c0cdd JS |
1746 | * getboottime64 - Return the real time of system boot. |
1747 | * @ts: pointer to the timespec64 to be set | |
7c3f1a57 | 1748 | * |
d08c0cdd | 1749 | * Returns the wall-time of boot in a timespec64. |
7c3f1a57 TJ |
1750 | * |
1751 | * This is based on the wall_to_monotonic offset and the total suspend | |
1752 | * time. Calls to settimeofday will affect the value returned (which | |
1753 | * basically means that however wrong your real time clock is at boot time, | |
1754 | * you get the right time here). | |
1755 | */ | |
d08c0cdd | 1756 | void getboottime64(struct timespec64 *ts) |
7c3f1a57 | 1757 | { |
3fdb14fd | 1758 | struct timekeeper *tk = &tk_core.timekeeper; |
02cba159 TG |
1759 | ktime_t t = ktime_sub(tk->offs_real, tk->offs_boot); |
1760 | ||
d08c0cdd | 1761 | *ts = ktime_to_timespec64(t); |
7c3f1a57 | 1762 | } |
d08c0cdd | 1763 | EXPORT_SYMBOL_GPL(getboottime64); |
7c3f1a57 | 1764 | |
17c38b74 | 1765 | unsigned long get_seconds(void) |
1766 | { | |
3fdb14fd | 1767 | struct timekeeper *tk = &tk_core.timekeeper; |
4e250fdd JS |
1768 | |
1769 | return tk->xtime_sec; | |
17c38b74 | 1770 | } |
1771 | EXPORT_SYMBOL(get_seconds); | |
1772 | ||
da15cfda | 1773 | struct timespec __current_kernel_time(void) |
1774 | { | |
3fdb14fd | 1775 | struct timekeeper *tk = &tk_core.timekeeper; |
4e250fdd | 1776 | |
7d489d15 | 1777 | return timespec64_to_timespec(tk_xtime(tk)); |
da15cfda | 1778 | } |
17c38b74 | 1779 | |
2c6b47de | 1780 | struct timespec current_kernel_time(void) |
1781 | { | |
3fdb14fd | 1782 | struct timekeeper *tk = &tk_core.timekeeper; |
7d489d15 | 1783 | struct timespec64 now; |
2c6b47de | 1784 | unsigned long seq; |
1785 | ||
1786 | do { | |
3fdb14fd | 1787 | seq = read_seqcount_begin(&tk_core.seq); |
83f57a11 | 1788 | |
4e250fdd | 1789 | now = tk_xtime(tk); |
3fdb14fd | 1790 | } while (read_seqcount_retry(&tk_core.seq, seq)); |
2c6b47de | 1791 | |
7d489d15 | 1792 | return timespec64_to_timespec(now); |
2c6b47de | 1793 | } |
2c6b47de | 1794 | EXPORT_SYMBOL(current_kernel_time); |
da15cfda | 1795 | |
334334b5 | 1796 | struct timespec64 get_monotonic_coarse64(void) |
da15cfda | 1797 | { |
3fdb14fd | 1798 | struct timekeeper *tk = &tk_core.timekeeper; |
7d489d15 | 1799 | struct timespec64 now, mono; |
da15cfda | 1800 | unsigned long seq; |
1801 | ||
1802 | do { | |
3fdb14fd | 1803 | seq = read_seqcount_begin(&tk_core.seq); |
83f57a11 | 1804 | |
4e250fdd JS |
1805 | now = tk_xtime(tk); |
1806 | mono = tk->wall_to_monotonic; | |
3fdb14fd | 1807 | } while (read_seqcount_retry(&tk_core.seq, seq)); |
da15cfda | 1808 | |
7d489d15 | 1809 | set_normalized_timespec64(&now, now.tv_sec + mono.tv_sec, |
da15cfda | 1810 | now.tv_nsec + mono.tv_nsec); |
7d489d15 | 1811 | |
334334b5 | 1812 | return now; |
da15cfda | 1813 | } |
871cf1e5 TH |
1814 | |
1815 | /* | |
d6ad4187 | 1816 | * Must hold jiffies_lock |
871cf1e5 TH |
1817 | */ |
1818 | void do_timer(unsigned long ticks) | |
1819 | { | |
1820 | jiffies_64 += ticks; | |
871cf1e5 TH |
1821 | calc_global_load(ticks); |
1822 | } | |
48cf76f7 TH |
1823 | |
1824 | /** | |
76f41088 JS |
1825 | * ktime_get_update_offsets_tick - hrtimer helper |
1826 | * @offs_real: pointer to storage for monotonic -> realtime offset | |
1827 | * @offs_boot: pointer to storage for monotonic -> boottime offset | |
1828 | * @offs_tai: pointer to storage for monotonic -> clock tai offset | |
1829 | * | |
1830 | * Returns monotonic time at last tick and various offsets | |
48cf76f7 | 1831 | */ |
76f41088 JS |
1832 | ktime_t ktime_get_update_offsets_tick(ktime_t *offs_real, ktime_t *offs_boot, |
1833 | ktime_t *offs_tai) | |
48cf76f7 | 1834 | { |
3fdb14fd | 1835 | struct timekeeper *tk = &tk_core.timekeeper; |
76f41088 | 1836 | unsigned int seq; |
48064f5f TG |
1837 | ktime_t base; |
1838 | u64 nsecs; | |
48cf76f7 TH |
1839 | |
1840 | do { | |
3fdb14fd | 1841 | seq = read_seqcount_begin(&tk_core.seq); |
76f41088 | 1842 | |
d28ede83 TG |
1843 | base = tk->tkr.base_mono; |
1844 | nsecs = tk->tkr.xtime_nsec >> tk->tkr.shift; | |
48064f5f | 1845 | |
76f41088 JS |
1846 | *offs_real = tk->offs_real; |
1847 | *offs_boot = tk->offs_boot; | |
1848 | *offs_tai = tk->offs_tai; | |
3fdb14fd | 1849 | } while (read_seqcount_retry(&tk_core.seq, seq)); |
76f41088 | 1850 | |
48064f5f | 1851 | return ktime_add_ns(base, nsecs); |
48cf76f7 | 1852 | } |
f0af911a | 1853 | |
f6c06abf TG |
1854 | #ifdef CONFIG_HIGH_RES_TIMERS |
1855 | /** | |
76f41088 | 1856 | * ktime_get_update_offsets_now - hrtimer helper |
f6c06abf TG |
1857 | * @offs_real: pointer to storage for monotonic -> realtime offset |
1858 | * @offs_boot: pointer to storage for monotonic -> boottime offset | |
b7bc50e4 | 1859 | * @offs_tai: pointer to storage for monotonic -> clock tai offset |
f6c06abf TG |
1860 | * |
1861 | * Returns current monotonic time and updates the offsets | |
b7bc50e4 | 1862 | * Called from hrtimer_interrupt() or retrigger_next_event() |
f6c06abf | 1863 | */ |
76f41088 | 1864 | ktime_t ktime_get_update_offsets_now(ktime_t *offs_real, ktime_t *offs_boot, |
90adda98 | 1865 | ktime_t *offs_tai) |
f6c06abf | 1866 | { |
3fdb14fd | 1867 | struct timekeeper *tk = &tk_core.timekeeper; |
f6c06abf | 1868 | unsigned int seq; |
a37c0aad TG |
1869 | ktime_t base; |
1870 | u64 nsecs; | |
f6c06abf TG |
1871 | |
1872 | do { | |
3fdb14fd | 1873 | seq = read_seqcount_begin(&tk_core.seq); |
f6c06abf | 1874 | |
d28ede83 | 1875 | base = tk->tkr.base_mono; |
0e5ac3a8 | 1876 | nsecs = timekeeping_get_ns(&tk->tkr); |
f6c06abf | 1877 | |
4e250fdd JS |
1878 | *offs_real = tk->offs_real; |
1879 | *offs_boot = tk->offs_boot; | |
90adda98 | 1880 | *offs_tai = tk->offs_tai; |
3fdb14fd | 1881 | } while (read_seqcount_retry(&tk_core.seq, seq)); |
f6c06abf | 1882 | |
a37c0aad | 1883 | return ktime_add_ns(base, nsecs); |
f6c06abf TG |
1884 | } |
1885 | #endif | |
1886 | ||
aa6f9c59 JS |
1887 | /** |
1888 | * do_adjtimex() - Accessor function to NTP __do_adjtimex function | |
1889 | */ | |
1890 | int do_adjtimex(struct timex *txc) | |
1891 | { | |
3fdb14fd | 1892 | struct timekeeper *tk = &tk_core.timekeeper; |
06c017fd | 1893 | unsigned long flags; |
7d489d15 | 1894 | struct timespec64 ts; |
4e8f8b34 | 1895 | s32 orig_tai, tai; |
e4085693 JS |
1896 | int ret; |
1897 | ||
1898 | /* Validate the data before disabling interrupts */ | |
1899 | ret = ntp_validate_timex(txc); | |
1900 | if (ret) | |
1901 | return ret; | |
1902 | ||
cef90377 JS |
1903 | if (txc->modes & ADJ_SETOFFSET) { |
1904 | struct timespec delta; | |
1905 | delta.tv_sec = txc->time.tv_sec; | |
1906 | delta.tv_nsec = txc->time.tv_usec; | |
1907 | if (!(txc->modes & ADJ_NANO)) | |
1908 | delta.tv_nsec *= 1000; | |
1909 | ret = timekeeping_inject_offset(&delta); | |
1910 | if (ret) | |
1911 | return ret; | |
1912 | } | |
1913 | ||
d6d29896 | 1914 | getnstimeofday64(&ts); |
87ace39b | 1915 | |
06c017fd | 1916 | raw_spin_lock_irqsave(&timekeeper_lock, flags); |
3fdb14fd | 1917 | write_seqcount_begin(&tk_core.seq); |
06c017fd | 1918 | |
4e8f8b34 | 1919 | orig_tai = tai = tk->tai_offset; |
87ace39b | 1920 | ret = __do_adjtimex(txc, &ts, &tai); |
aa6f9c59 | 1921 | |
4e8f8b34 JS |
1922 | if (tai != orig_tai) { |
1923 | __timekeeping_set_tai_offset(tk, tai); | |
f55c0760 | 1924 | timekeeping_update(tk, TK_MIRROR | TK_CLOCK_WAS_SET); |
4e8f8b34 | 1925 | } |
3fdb14fd | 1926 | write_seqcount_end(&tk_core.seq); |
06c017fd JS |
1927 | raw_spin_unlock_irqrestore(&timekeeper_lock, flags); |
1928 | ||
6fdda9a9 JS |
1929 | if (tai != orig_tai) |
1930 | clock_was_set(); | |
1931 | ||
7bd36014 JS |
1932 | ntp_notify_cmos_timer(); |
1933 | ||
87ace39b JS |
1934 | return ret; |
1935 | } | |
aa6f9c59 JS |
1936 | |
1937 | #ifdef CONFIG_NTP_PPS | |
1938 | /** | |
1939 | * hardpps() - Accessor function to NTP __hardpps function | |
1940 | */ | |
1941 | void hardpps(const struct timespec *phase_ts, const struct timespec *raw_ts) | |
1942 | { | |
06c017fd JS |
1943 | unsigned long flags; |
1944 | ||
1945 | raw_spin_lock_irqsave(&timekeeper_lock, flags); | |
3fdb14fd | 1946 | write_seqcount_begin(&tk_core.seq); |
06c017fd | 1947 | |
aa6f9c59 | 1948 | __hardpps(phase_ts, raw_ts); |
06c017fd | 1949 | |
3fdb14fd | 1950 | write_seqcount_end(&tk_core.seq); |
06c017fd | 1951 | raw_spin_unlock_irqrestore(&timekeeper_lock, flags); |
aa6f9c59 JS |
1952 | } |
1953 | EXPORT_SYMBOL(hardpps); | |
1954 | #endif | |
1955 | ||
f0af911a TH |
1956 | /** |
1957 | * xtime_update() - advances the timekeeping infrastructure | |
1958 | * @ticks: number of ticks, that have elapsed since the last call. | |
1959 | * | |
1960 | * Must be called with interrupts disabled. | |
1961 | */ | |
1962 | void xtime_update(unsigned long ticks) | |
1963 | { | |
d6ad4187 | 1964 | write_seqlock(&jiffies_lock); |
f0af911a | 1965 | do_timer(ticks); |
d6ad4187 | 1966 | write_sequnlock(&jiffies_lock); |
47a1b796 | 1967 | update_wall_time(); |
f0af911a | 1968 | } |