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Commit | Line | Data |
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8524070b JS |
1 | /* |
2 | * linux/kernel/time/timekeeping.c | |
3 | * | |
4 | * Kernel timekeeping code and accessor functions | |
5 | * | |
6 | * This code was moved from linux/kernel/timer.c. | |
7 | * Please see that file for copyright and history logs. | |
8 | * | |
9 | */ | |
10 | ||
d7b4202e | 11 | #include <linux/timekeeper_internal.h> |
8524070b JS |
12 | #include <linux/module.h> |
13 | #include <linux/interrupt.h> | |
14 | #include <linux/percpu.h> | |
15 | #include <linux/init.h> | |
16 | #include <linux/mm.h> | |
38b8d208 | 17 | #include <linux/nmi.h> |
d43c36dc | 18 | #include <linux/sched.h> |
4f17722c | 19 | #include <linux/sched/loadavg.h> |
e1a85b2c | 20 | #include <linux/syscore_ops.h> |
8524070b JS |
21 | #include <linux/clocksource.h> |
22 | #include <linux/jiffies.h> | |
23 | #include <linux/time.h> | |
24 | #include <linux/tick.h> | |
75c5158f | 25 | #include <linux/stop_machine.h> |
e0b306fe | 26 | #include <linux/pvclock_gtod.h> |
52f5684c | 27 | #include <linux/compiler.h> |
8524070b | 28 | |
eb93e4d9 | 29 | #include "tick-internal.h" |
aa6f9c59 | 30 | #include "ntp_internal.h" |
5c83545f | 31 | #include "timekeeping_internal.h" |
155ec602 | 32 | |
04397fe9 DV |
33 | #define TK_CLEAR_NTP (1 << 0) |
34 | #define TK_MIRROR (1 << 1) | |
780427f0 | 35 | #define TK_CLOCK_WAS_SET (1 << 2) |
04397fe9 | 36 | |
3fdb14fd TG |
37 | /* |
38 | * The most important data for readout fits into a single 64 byte | |
39 | * cache line. | |
40 | */ | |
41 | static struct { | |
42 | seqcount_t seq; | |
43 | struct timekeeper timekeeper; | |
44 | } tk_core ____cacheline_aligned; | |
45 | ||
9a7a71b1 | 46 | static DEFINE_RAW_SPINLOCK(timekeeper_lock); |
48cdc135 | 47 | static struct timekeeper shadow_timekeeper; |
155ec602 | 48 | |
4396e058 TG |
49 | /** |
50 | * struct tk_fast - NMI safe timekeeper | |
51 | * @seq: Sequence counter for protecting updates. The lowest bit | |
52 | * is the index for the tk_read_base array | |
53 | * @base: tk_read_base array. Access is indexed by the lowest bit of | |
54 | * @seq. | |
55 | * | |
56 | * See @update_fast_timekeeper() below. | |
57 | */ | |
58 | struct tk_fast { | |
59 | seqcount_t seq; | |
60 | struct tk_read_base base[2]; | |
61 | }; | |
62 | ||
63 | static struct tk_fast tk_fast_mono ____cacheline_aligned; | |
f09cb9a1 | 64 | static struct tk_fast tk_fast_raw ____cacheline_aligned; |
4396e058 | 65 | |
8fcce546 JS |
66 | /* flag for if timekeeping is suspended */ |
67 | int __read_mostly timekeeping_suspended; | |
68 | ||
1e75fa8b JS |
69 | static inline void tk_normalize_xtime(struct timekeeper *tk) |
70 | { | |
876e7881 PZ |
71 | while (tk->tkr_mono.xtime_nsec >= ((u64)NSEC_PER_SEC << tk->tkr_mono.shift)) { |
72 | tk->tkr_mono.xtime_nsec -= (u64)NSEC_PER_SEC << tk->tkr_mono.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; | |
876e7881 | 82 | ts.tv_nsec = (long)(tk->tkr_mono.xtime_nsec >> tk->tkr_mono.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; | |
876e7881 | 89 | tk->tkr_mono.xtime_nsec = (u64)ts->tv_nsec << tk->tkr_mono.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; | |
876e7881 | 95 | tk->tkr_mono.xtime_nsec += (u64)ts->tv_nsec << tk->tkr_mono.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); |
2456e855 | 109 | WARN_ON_ONCE(tk->offs_real != timespec64_to_ktime(tmp)); |
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 | ||
ceea5e37 JS |
121 | /* |
122 | * tk_clock_read - atomic clocksource read() helper | |
123 | * | |
124 | * This helper is necessary to use in the read paths because, while the | |
125 | * seqlock ensures we don't return a bad value while structures are updated, | |
126 | * it doesn't protect from potential crashes. There is the possibility that | |
127 | * the tkr's clocksource may change between the read reference, and the | |
128 | * clock reference passed to the read function. This can cause crashes if | |
129 | * the wrong clocksource is passed to the wrong read function. | |
130 | * This isn't necessary to use when holding the timekeeper_lock or doing | |
131 | * a read of the fast-timekeeper tkrs (which is protected by its own locking | |
132 | * and update logic). | |
133 | */ | |
134 | static inline u64 tk_clock_read(struct tk_read_base *tkr) | |
135 | { | |
136 | struct clocksource *clock = READ_ONCE(tkr->clock); | |
137 | ||
138 | return clock->read(clock); | |
139 | } | |
140 | ||
3c17ad19 | 141 | #ifdef CONFIG_DEBUG_TIMEKEEPING |
4ca22c26 | 142 | #define WARNING_FREQ (HZ*300) /* 5 minute rate-limiting */ |
4ca22c26 | 143 | |
a5a1d1c2 | 144 | static void timekeeping_check_update(struct timekeeper *tk, u64 offset) |
3c17ad19 JS |
145 | { |
146 | ||
a5a1d1c2 | 147 | u64 max_cycles = tk->tkr_mono.clock->max_cycles; |
876e7881 | 148 | const char *name = tk->tkr_mono.clock->name; |
3c17ad19 JS |
149 | |
150 | if (offset > max_cycles) { | |
a558cd02 | 151 | 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 | 152 | offset, name, max_cycles); |
a558cd02 | 153 | printk_deferred(" timekeeping: Your kernel is sick, but tries to cope by capping time updates\n"); |
3c17ad19 JS |
154 | } else { |
155 | if (offset > (max_cycles >> 1)) { | |
fc4fa6e1 | 156 | printk_deferred("INFO: timekeeping: Cycle offset (%lld) is larger than the '%s' clock's 50%% safety margin (%lld)\n", |
3c17ad19 JS |
157 | offset, name, max_cycles >> 1); |
158 | printk_deferred(" timekeeping: Your kernel is still fine, but is feeling a bit nervous\n"); | |
159 | } | |
160 | } | |
4ca22c26 | 161 | |
57d05a93 JS |
162 | if (tk->underflow_seen) { |
163 | if (jiffies - tk->last_warning > WARNING_FREQ) { | |
4ca22c26 JS |
164 | printk_deferred("WARNING: Underflow in clocksource '%s' observed, time update ignored.\n", name); |
165 | printk_deferred(" Please report this, consider using a different clocksource, if possible.\n"); | |
166 | printk_deferred(" Your kernel is probably still fine.\n"); | |
57d05a93 | 167 | tk->last_warning = jiffies; |
4ca22c26 | 168 | } |
57d05a93 | 169 | tk->underflow_seen = 0; |
4ca22c26 JS |
170 | } |
171 | ||
57d05a93 JS |
172 | if (tk->overflow_seen) { |
173 | if (jiffies - tk->last_warning > WARNING_FREQ) { | |
4ca22c26 JS |
174 | printk_deferred("WARNING: Overflow in clocksource '%s' observed, time update capped.\n", name); |
175 | printk_deferred(" Please report this, consider using a different clocksource, if possible.\n"); | |
176 | printk_deferred(" Your kernel is probably still fine.\n"); | |
57d05a93 | 177 | tk->last_warning = jiffies; |
4ca22c26 | 178 | } |
57d05a93 | 179 | tk->overflow_seen = 0; |
4ca22c26 | 180 | } |
3c17ad19 | 181 | } |
a558cd02 | 182 | |
a5a1d1c2 | 183 | static inline u64 timekeeping_get_delta(struct tk_read_base *tkr) |
a558cd02 | 184 | { |
57d05a93 | 185 | struct timekeeper *tk = &tk_core.timekeeper; |
a5a1d1c2 | 186 | u64 now, last, mask, max, delta; |
4ca22c26 | 187 | unsigned int seq; |
a558cd02 | 188 | |
4ca22c26 JS |
189 | /* |
190 | * Since we're called holding a seqlock, the data may shift | |
191 | * under us while we're doing the calculation. This can cause | |
192 | * false positives, since we'd note a problem but throw the | |
193 | * results away. So nest another seqlock here to atomically | |
194 | * grab the points we are checking with. | |
195 | */ | |
196 | do { | |
197 | seq = read_seqcount_begin(&tk_core.seq); | |
ceea5e37 | 198 | now = tk_clock_read(tkr); |
4ca22c26 JS |
199 | last = tkr->cycle_last; |
200 | mask = tkr->mask; | |
201 | max = tkr->clock->max_cycles; | |
202 | } while (read_seqcount_retry(&tk_core.seq, seq)); | |
a558cd02 | 203 | |
4ca22c26 | 204 | delta = clocksource_delta(now, last, mask); |
a558cd02 | 205 | |
057b87e3 JS |
206 | /* |
207 | * Try to catch underflows by checking if we are seeing small | |
208 | * mask-relative negative values. | |
209 | */ | |
4ca22c26 | 210 | if (unlikely((~delta & mask) < (mask >> 3))) { |
57d05a93 | 211 | tk->underflow_seen = 1; |
057b87e3 | 212 | delta = 0; |
4ca22c26 | 213 | } |
057b87e3 | 214 | |
a558cd02 | 215 | /* Cap delta value to the max_cycles values to avoid mult overflows */ |
4ca22c26 | 216 | if (unlikely(delta > max)) { |
57d05a93 | 217 | tk->overflow_seen = 1; |
a558cd02 | 218 | delta = tkr->clock->max_cycles; |
4ca22c26 | 219 | } |
a558cd02 JS |
220 | |
221 | return delta; | |
222 | } | |
3c17ad19 | 223 | #else |
a5a1d1c2 | 224 | static inline void timekeeping_check_update(struct timekeeper *tk, u64 offset) |
3c17ad19 JS |
225 | { |
226 | } | |
a5a1d1c2 | 227 | static inline u64 timekeeping_get_delta(struct tk_read_base *tkr) |
a558cd02 | 228 | { |
a5a1d1c2 | 229 | u64 cycle_now, delta; |
a558cd02 JS |
230 | |
231 | /* read clocksource */ | |
ceea5e37 | 232 | cycle_now = tk_clock_read(tkr); |
a558cd02 JS |
233 | |
234 | /* calculate the delta since the last update_wall_time */ | |
235 | delta = clocksource_delta(cycle_now, tkr->cycle_last, tkr->mask); | |
236 | ||
237 | return delta; | |
238 | } | |
3c17ad19 JS |
239 | #endif |
240 | ||
155ec602 | 241 | /** |
d26e4fe0 | 242 | * tk_setup_internals - Set up internals to use clocksource clock. |
155ec602 | 243 | * |
d26e4fe0 | 244 | * @tk: The target timekeeper to setup. |
155ec602 MS |
245 | * @clock: Pointer to clocksource. |
246 | * | |
247 | * Calculates a fixed cycle/nsec interval for a given clocksource/adjustment | |
248 | * pair and interval request. | |
249 | * | |
250 | * Unless you're the timekeeping code, you should not be using this! | |
251 | */ | |
f726a697 | 252 | static void tk_setup_internals(struct timekeeper *tk, struct clocksource *clock) |
155ec602 | 253 | { |
a5a1d1c2 | 254 | u64 interval; |
a386b5af | 255 | u64 tmp, ntpinterval; |
1e75fa8b | 256 | struct clocksource *old_clock; |
155ec602 | 257 | |
2c756feb | 258 | ++tk->cs_was_changed_seq; |
876e7881 PZ |
259 | old_clock = tk->tkr_mono.clock; |
260 | tk->tkr_mono.clock = clock; | |
876e7881 | 261 | tk->tkr_mono.mask = clock->mask; |
ceea5e37 | 262 | tk->tkr_mono.cycle_last = tk_clock_read(&tk->tkr_mono); |
155ec602 | 263 | |
4a4ad80d | 264 | tk->tkr_raw.clock = clock; |
4a4ad80d PZ |
265 | tk->tkr_raw.mask = clock->mask; |
266 | tk->tkr_raw.cycle_last = tk->tkr_mono.cycle_last; | |
267 | ||
155ec602 MS |
268 | /* Do the ns -> cycle conversion first, using original mult */ |
269 | tmp = NTP_INTERVAL_LENGTH; | |
270 | tmp <<= clock->shift; | |
a386b5af | 271 | ntpinterval = tmp; |
0a544198 MS |
272 | tmp += clock->mult/2; |
273 | do_div(tmp, clock->mult); | |
155ec602 MS |
274 | if (tmp == 0) |
275 | tmp = 1; | |
276 | ||
a5a1d1c2 | 277 | interval = (u64) tmp; |
f726a697 | 278 | tk->cycle_interval = interval; |
155ec602 MS |
279 | |
280 | /* Go back from cycles -> shifted ns */ | |
cbd99e3b | 281 | tk->xtime_interval = interval * clock->mult; |
f726a697 | 282 | tk->xtime_remainder = ntpinterval - tk->xtime_interval; |
3d88d56c | 283 | tk->raw_interval = interval * clock->mult; |
155ec602 | 284 | |
1e75fa8b JS |
285 | /* if changing clocks, convert xtime_nsec shift units */ |
286 | if (old_clock) { | |
287 | int shift_change = clock->shift - old_clock->shift; | |
288 | if (shift_change < 0) | |
876e7881 | 289 | tk->tkr_mono.xtime_nsec >>= -shift_change; |
1e75fa8b | 290 | else |
876e7881 | 291 | tk->tkr_mono.xtime_nsec <<= shift_change; |
1e75fa8b | 292 | } |
4a4ad80d PZ |
293 | tk->tkr_raw.xtime_nsec = 0; |
294 | ||
876e7881 | 295 | tk->tkr_mono.shift = clock->shift; |
4a4ad80d | 296 | tk->tkr_raw.shift = clock->shift; |
155ec602 | 297 | |
f726a697 JS |
298 | tk->ntp_error = 0; |
299 | tk->ntp_error_shift = NTP_SCALE_SHIFT - clock->shift; | |
375f45b5 | 300 | tk->ntp_tick = ntpinterval << tk->ntp_error_shift; |
0a544198 MS |
301 | |
302 | /* | |
303 | * The timekeeper keeps its own mult values for the currently | |
304 | * active clocksource. These value will be adjusted via NTP | |
305 | * to counteract clock drifting. | |
306 | */ | |
876e7881 | 307 | tk->tkr_mono.mult = clock->mult; |
4a4ad80d | 308 | tk->tkr_raw.mult = clock->mult; |
dc491596 | 309 | tk->ntp_err_mult = 0; |
155ec602 | 310 | } |
8524070b | 311 | |
2ba2a305 | 312 | /* Timekeeper helper functions. */ |
7b1f6207 SW |
313 | |
314 | #ifdef CONFIG_ARCH_USES_GETTIMEOFFSET | |
e06fde37 TG |
315 | static u32 default_arch_gettimeoffset(void) { return 0; } |
316 | u32 (*arch_gettimeoffset)(void) = default_arch_gettimeoffset; | |
7b1f6207 | 317 | #else |
e06fde37 | 318 | static inline u32 arch_gettimeoffset(void) { return 0; } |
7b1f6207 SW |
319 | #endif |
320 | ||
a5a1d1c2 | 321 | static inline u64 timekeeping_delta_to_ns(struct tk_read_base *tkr, u64 delta) |
6bd58f09 | 322 | { |
9c164572 | 323 | u64 nsec; |
6bd58f09 CH |
324 | |
325 | nsec = delta * tkr->mult + tkr->xtime_nsec; | |
326 | nsec >>= tkr->shift; | |
327 | ||
328 | /* If arch requires, add in get_arch_timeoffset() */ | |
329 | return nsec + arch_gettimeoffset(); | |
330 | } | |
331 | ||
acc89612 | 332 | static inline u64 timekeeping_get_ns(struct tk_read_base *tkr) |
2ba2a305 | 333 | { |
a5a1d1c2 | 334 | u64 delta; |
2ba2a305 | 335 | |
a558cd02 | 336 | delta = timekeeping_get_delta(tkr); |
6bd58f09 CH |
337 | return timekeeping_delta_to_ns(tkr, delta); |
338 | } | |
2ba2a305 | 339 | |
a5a1d1c2 | 340 | static inline u64 timekeeping_cycles_to_ns(struct tk_read_base *tkr, u64 cycles) |
6bd58f09 | 341 | { |
a5a1d1c2 | 342 | u64 delta; |
f2a5a085 | 343 | |
6bd58f09 CH |
344 | /* calculate the delta since the last update_wall_time */ |
345 | delta = clocksource_delta(cycles, tkr->cycle_last, tkr->mask); | |
346 | return timekeeping_delta_to_ns(tkr, delta); | |
2ba2a305 MS |
347 | } |
348 | ||
4396e058 TG |
349 | /** |
350 | * update_fast_timekeeper - Update the fast and NMI safe monotonic timekeeper. | |
affe3e85 | 351 | * @tkr: Timekeeping readout base from which we take the update |
4396e058 TG |
352 | * |
353 | * We want to use this from any context including NMI and tracing / | |
354 | * instrumenting the timekeeping code itself. | |
355 | * | |
6695b92a | 356 | * Employ the latch technique; see @raw_write_seqcount_latch. |
4396e058 TG |
357 | * |
358 | * So if a NMI hits the update of base[0] then it will use base[1] | |
359 | * which is still consistent. In the worst case this can result is a | |
360 | * slightly wrong timestamp (a few nanoseconds). See | |
361 | * @ktime_get_mono_fast_ns. | |
362 | */ | |
4498e746 | 363 | static void update_fast_timekeeper(struct tk_read_base *tkr, struct tk_fast *tkf) |
4396e058 | 364 | { |
4498e746 | 365 | struct tk_read_base *base = tkf->base; |
4396e058 TG |
366 | |
367 | /* Force readers off to base[1] */ | |
4498e746 | 368 | raw_write_seqcount_latch(&tkf->seq); |
4396e058 TG |
369 | |
370 | /* Update base[0] */ | |
affe3e85 | 371 | memcpy(base, tkr, sizeof(*base)); |
4396e058 TG |
372 | |
373 | /* Force readers back to base[0] */ | |
4498e746 | 374 | raw_write_seqcount_latch(&tkf->seq); |
4396e058 TG |
375 | |
376 | /* Update base[1] */ | |
377 | memcpy(base + 1, base, sizeof(*base)); | |
378 | } | |
379 | ||
380 | /** | |
381 | * ktime_get_mono_fast_ns - Fast NMI safe access to clock monotonic | |
382 | * | |
383 | * This timestamp is not guaranteed to be monotonic across an update. | |
384 | * The timestamp is calculated by: | |
385 | * | |
386 | * now = base_mono + clock_delta * slope | |
387 | * | |
388 | * So if the update lowers the slope, readers who are forced to the | |
389 | * not yet updated second array are still using the old steeper slope. | |
390 | * | |
391 | * tmono | |
392 | * ^ | |
393 | * | o n | |
394 | * | o n | |
395 | * | u | |
396 | * | o | |
397 | * |o | |
398 | * |12345678---> reader order | |
399 | * | |
400 | * o = old slope | |
401 | * u = update | |
402 | * n = new slope | |
403 | * | |
404 | * So reader 6 will observe time going backwards versus reader 5. | |
405 | * | |
406 | * While other CPUs are likely to be able observe that, the only way | |
407 | * for a CPU local observation is when an NMI hits in the middle of | |
408 | * the update. Timestamps taken from that NMI context might be ahead | |
409 | * of the following timestamps. Callers need to be aware of that and | |
410 | * deal with it. | |
411 | */ | |
4498e746 | 412 | static __always_inline u64 __ktime_get_fast_ns(struct tk_fast *tkf) |
4396e058 TG |
413 | { |
414 | struct tk_read_base *tkr; | |
415 | unsigned int seq; | |
416 | u64 now; | |
417 | ||
418 | do { | |
7fc26327 | 419 | seq = raw_read_seqcount_latch(&tkf->seq); |
4498e746 | 420 | tkr = tkf->base + (seq & 0x01); |
27727df2 JS |
421 | now = ktime_to_ns(tkr->base); |
422 | ||
58bfea95 JS |
423 | now += timekeeping_delta_to_ns(tkr, |
424 | clocksource_delta( | |
ceea5e37 | 425 | tk_clock_read(tkr), |
58bfea95 JS |
426 | tkr->cycle_last, |
427 | tkr->mask)); | |
4498e746 | 428 | } while (read_seqcount_retry(&tkf->seq, seq)); |
4396e058 | 429 | |
4396e058 TG |
430 | return now; |
431 | } | |
4498e746 PZ |
432 | |
433 | u64 ktime_get_mono_fast_ns(void) | |
434 | { | |
435 | return __ktime_get_fast_ns(&tk_fast_mono); | |
436 | } | |
4396e058 TG |
437 | EXPORT_SYMBOL_GPL(ktime_get_mono_fast_ns); |
438 | ||
f09cb9a1 PZ |
439 | u64 ktime_get_raw_fast_ns(void) |
440 | { | |
441 | return __ktime_get_fast_ns(&tk_fast_raw); | |
442 | } | |
443 | EXPORT_SYMBOL_GPL(ktime_get_raw_fast_ns); | |
444 | ||
948a5312 JF |
445 | /** |
446 | * ktime_get_boot_fast_ns - NMI safe and fast access to boot clock. | |
447 | * | |
448 | * To keep it NMI safe since we're accessing from tracing, we're not using a | |
449 | * separate timekeeper with updates to monotonic clock and boot offset | |
450 | * protected with seqlocks. This has the following minor side effects: | |
451 | * | |
452 | * (1) Its possible that a timestamp be taken after the boot offset is updated | |
453 | * but before the timekeeper is updated. If this happens, the new boot offset | |
454 | * is added to the old timekeeping making the clock appear to update slightly | |
455 | * earlier: | |
456 | * CPU 0 CPU 1 | |
457 | * timekeeping_inject_sleeptime64() | |
458 | * __timekeeping_inject_sleeptime(tk, delta); | |
459 | * timestamp(); | |
460 | * timekeeping_update(tk, TK_CLEAR_NTP...); | |
461 | * | |
462 | * (2) On 32-bit systems, the 64-bit boot offset (tk->offs_boot) may be | |
463 | * partially updated. Since the tk->offs_boot update is a rare event, this | |
464 | * should be a rare occurrence which postprocessing should be able to handle. | |
465 | */ | |
466 | u64 notrace ktime_get_boot_fast_ns(void) | |
467 | { | |
468 | struct timekeeper *tk = &tk_core.timekeeper; | |
469 | ||
470 | return (ktime_get_mono_fast_ns() + ktime_to_ns(tk->offs_boot)); | |
471 | } | |
472 | EXPORT_SYMBOL_GPL(ktime_get_boot_fast_ns); | |
473 | ||
060407ae | 474 | /* Suspend-time cycles value for halted fast timekeeper. */ |
a5a1d1c2 | 475 | static u64 cycles_at_suspend; |
060407ae | 476 | |
a5a1d1c2 | 477 | static u64 dummy_clock_read(struct clocksource *cs) |
060407ae RW |
478 | { |
479 | return cycles_at_suspend; | |
480 | } | |
481 | ||
ceea5e37 JS |
482 | static struct clocksource dummy_clock = { |
483 | .read = dummy_clock_read, | |
484 | }; | |
485 | ||
060407ae RW |
486 | /** |
487 | * halt_fast_timekeeper - Prevent fast timekeeper from accessing clocksource. | |
488 | * @tk: Timekeeper to snapshot. | |
489 | * | |
490 | * It generally is unsafe to access the clocksource after timekeeping has been | |
491 | * suspended, so take a snapshot of the readout base of @tk and use it as the | |
492 | * fast timekeeper's readout base while suspended. It will return the same | |
493 | * number of cycles every time until timekeeping is resumed at which time the | |
494 | * proper readout base for the fast timekeeper will be restored automatically. | |
495 | */ | |
496 | static void halt_fast_timekeeper(struct timekeeper *tk) | |
497 | { | |
498 | static struct tk_read_base tkr_dummy; | |
876e7881 | 499 | struct tk_read_base *tkr = &tk->tkr_mono; |
060407ae RW |
500 | |
501 | memcpy(&tkr_dummy, tkr, sizeof(tkr_dummy)); | |
ceea5e37 JS |
502 | cycles_at_suspend = tk_clock_read(tkr); |
503 | tkr_dummy.clock = &dummy_clock; | |
4498e746 | 504 | update_fast_timekeeper(&tkr_dummy, &tk_fast_mono); |
f09cb9a1 PZ |
505 | |
506 | tkr = &tk->tkr_raw; | |
507 | memcpy(&tkr_dummy, tkr, sizeof(tkr_dummy)); | |
ceea5e37 | 508 | tkr_dummy.clock = &dummy_clock; |
f09cb9a1 | 509 | update_fast_timekeeper(&tkr_dummy, &tk_fast_raw); |
060407ae RW |
510 | } |
511 | ||
c905fae4 TG |
512 | #ifdef CONFIG_GENERIC_TIME_VSYSCALL_OLD |
513 | ||
514 | static inline void update_vsyscall(struct timekeeper *tk) | |
515 | { | |
0680eb1f | 516 | struct timespec xt, wm; |
c905fae4 | 517 | |
e2dff1ec | 518 | xt = timespec64_to_timespec(tk_xtime(tk)); |
0680eb1f | 519 | wm = timespec64_to_timespec(tk->wall_to_monotonic); |
876e7881 PZ |
520 | update_vsyscall_old(&xt, &wm, tk->tkr_mono.clock, tk->tkr_mono.mult, |
521 | tk->tkr_mono.cycle_last); | |
c905fae4 TG |
522 | } |
523 | ||
524 | static inline void old_vsyscall_fixup(struct timekeeper *tk) | |
525 | { | |
526 | s64 remainder; | |
527 | ||
528 | /* | |
529 | * Store only full nanoseconds into xtime_nsec after rounding | |
530 | * it up and add the remainder to the error difference. | |
531 | * XXX - This is necessary to avoid small 1ns inconsistnecies caused | |
532 | * by truncating the remainder in vsyscalls. However, it causes | |
533 | * additional work to be done in timekeeping_adjust(). Once | |
534 | * the vsyscall implementations are converted to use xtime_nsec | |
535 | * (shifted nanoseconds), and CONFIG_GENERIC_TIME_VSYSCALL_OLD | |
536 | * users are removed, this can be killed. | |
537 | */ | |
876e7881 | 538 | remainder = tk->tkr_mono.xtime_nsec & ((1ULL << tk->tkr_mono.shift) - 1); |
0209b937 TG |
539 | if (remainder != 0) { |
540 | tk->tkr_mono.xtime_nsec -= remainder; | |
541 | tk->tkr_mono.xtime_nsec += 1ULL << tk->tkr_mono.shift; | |
542 | tk->ntp_error += remainder << tk->ntp_error_shift; | |
543 | tk->ntp_error -= (1ULL << tk->tkr_mono.shift) << tk->ntp_error_shift; | |
544 | } | |
c905fae4 TG |
545 | } |
546 | #else | |
547 | #define old_vsyscall_fixup(tk) | |
548 | #endif | |
549 | ||
e0b306fe MT |
550 | static RAW_NOTIFIER_HEAD(pvclock_gtod_chain); |
551 | ||
780427f0 | 552 | static void update_pvclock_gtod(struct timekeeper *tk, bool was_set) |
e0b306fe | 553 | { |
780427f0 | 554 | raw_notifier_call_chain(&pvclock_gtod_chain, was_set, tk); |
e0b306fe MT |
555 | } |
556 | ||
557 | /** | |
558 | * pvclock_gtod_register_notifier - register a pvclock timedata update listener | |
e0b306fe MT |
559 | */ |
560 | int pvclock_gtod_register_notifier(struct notifier_block *nb) | |
561 | { | |
3fdb14fd | 562 | struct timekeeper *tk = &tk_core.timekeeper; |
e0b306fe MT |
563 | unsigned long flags; |
564 | int ret; | |
565 | ||
9a7a71b1 | 566 | raw_spin_lock_irqsave(&timekeeper_lock, flags); |
e0b306fe | 567 | ret = raw_notifier_chain_register(&pvclock_gtod_chain, nb); |
780427f0 | 568 | update_pvclock_gtod(tk, true); |
9a7a71b1 | 569 | raw_spin_unlock_irqrestore(&timekeeper_lock, flags); |
e0b306fe MT |
570 | |
571 | return ret; | |
572 | } | |
573 | EXPORT_SYMBOL_GPL(pvclock_gtod_register_notifier); | |
574 | ||
575 | /** | |
576 | * pvclock_gtod_unregister_notifier - unregister a pvclock | |
577 | * timedata update listener | |
e0b306fe MT |
578 | */ |
579 | int pvclock_gtod_unregister_notifier(struct notifier_block *nb) | |
580 | { | |
e0b306fe MT |
581 | unsigned long flags; |
582 | int ret; | |
583 | ||
9a7a71b1 | 584 | raw_spin_lock_irqsave(&timekeeper_lock, flags); |
e0b306fe | 585 | ret = raw_notifier_chain_unregister(&pvclock_gtod_chain, nb); |
9a7a71b1 | 586 | raw_spin_unlock_irqrestore(&timekeeper_lock, flags); |
e0b306fe MT |
587 | |
588 | return ret; | |
589 | } | |
590 | EXPORT_SYMBOL_GPL(pvclock_gtod_unregister_notifier); | |
591 | ||
833f32d7 JS |
592 | /* |
593 | * tk_update_leap_state - helper to update the next_leap_ktime | |
594 | */ | |
595 | static inline void tk_update_leap_state(struct timekeeper *tk) | |
596 | { | |
597 | tk->next_leap_ktime = ntp_get_next_leap(); | |
2456e855 | 598 | if (tk->next_leap_ktime != KTIME_MAX) |
833f32d7 JS |
599 | /* Convert to monotonic time */ |
600 | tk->next_leap_ktime = ktime_sub(tk->next_leap_ktime, tk->offs_real); | |
601 | } | |
602 | ||
7c032df5 TG |
603 | /* |
604 | * Update the ktime_t based scalar nsec members of the timekeeper | |
605 | */ | |
606 | static inline void tk_update_ktime_data(struct timekeeper *tk) | |
607 | { | |
9e3680b1 HS |
608 | u64 seconds; |
609 | u32 nsec; | |
7c032df5 TG |
610 | |
611 | /* | |
612 | * The xtime based monotonic readout is: | |
613 | * nsec = (xtime_sec + wtm_sec) * 1e9 + wtm_nsec + now(); | |
614 | * The ktime based monotonic readout is: | |
615 | * nsec = base_mono + now(); | |
616 | * ==> base_mono = (xtime_sec + wtm_sec) * 1e9 + wtm_nsec | |
617 | */ | |
9e3680b1 HS |
618 | seconds = (u64)(tk->xtime_sec + tk->wall_to_monotonic.tv_sec); |
619 | nsec = (u32) tk->wall_to_monotonic.tv_nsec; | |
876e7881 | 620 | tk->tkr_mono.base = ns_to_ktime(seconds * NSEC_PER_SEC + nsec); |
f519b1a2 TG |
621 | |
622 | /* Update the monotonic raw base */ | |
4a4ad80d | 623 | tk->tkr_raw.base = timespec64_to_ktime(tk->raw_time); |
9e3680b1 HS |
624 | |
625 | /* | |
626 | * The sum of the nanoseconds portions of xtime and | |
627 | * wall_to_monotonic can be greater/equal one second. Take | |
628 | * this into account before updating tk->ktime_sec. | |
629 | */ | |
876e7881 | 630 | nsec += (u32)(tk->tkr_mono.xtime_nsec >> tk->tkr_mono.shift); |
9e3680b1 HS |
631 | if (nsec >= NSEC_PER_SEC) |
632 | seconds++; | |
633 | tk->ktime_sec = seconds; | |
7c032df5 TG |
634 | } |
635 | ||
9a7a71b1 | 636 | /* must hold timekeeper_lock */ |
04397fe9 | 637 | static void timekeeping_update(struct timekeeper *tk, unsigned int action) |
cc06268c | 638 | { |
04397fe9 | 639 | if (action & TK_CLEAR_NTP) { |
f726a697 | 640 | tk->ntp_error = 0; |
cc06268c TG |
641 | ntp_clear(); |
642 | } | |
48cdc135 | 643 | |
833f32d7 | 644 | tk_update_leap_state(tk); |
7c032df5 TG |
645 | tk_update_ktime_data(tk); |
646 | ||
9bf2419f TG |
647 | update_vsyscall(tk); |
648 | update_pvclock_gtod(tk, action & TK_CLOCK_WAS_SET); | |
649 | ||
4498e746 | 650 | update_fast_timekeeper(&tk->tkr_mono, &tk_fast_mono); |
f09cb9a1 | 651 | update_fast_timekeeper(&tk->tkr_raw, &tk_fast_raw); |
868a3e91 TG |
652 | |
653 | if (action & TK_CLOCK_WAS_SET) | |
654 | tk->clock_was_set_seq++; | |
d1518326 JS |
655 | /* |
656 | * The mirroring of the data to the shadow-timekeeper needs | |
657 | * to happen last here to ensure we don't over-write the | |
658 | * timekeeper structure on the next update with stale data | |
659 | */ | |
660 | if (action & TK_MIRROR) | |
661 | memcpy(&shadow_timekeeper, &tk_core.timekeeper, | |
662 | sizeof(tk_core.timekeeper)); | |
cc06268c TG |
663 | } |
664 | ||
8524070b | 665 | /** |
155ec602 | 666 | * timekeeping_forward_now - update clock to the current time |
8524070b | 667 | * |
9a055117 RZ |
668 | * Forward the current clock to update its state since the last call to |
669 | * update_wall_time(). This is useful before significant clock changes, | |
670 | * as it avoids having to deal with this time offset explicitly. | |
8524070b | 671 | */ |
f726a697 | 672 | static void timekeeping_forward_now(struct timekeeper *tk) |
8524070b | 673 | { |
a5a1d1c2 | 674 | u64 cycle_now, delta; |
acc89612 | 675 | u64 nsec; |
8524070b | 676 | |
ceea5e37 | 677 | cycle_now = tk_clock_read(&tk->tkr_mono); |
876e7881 PZ |
678 | delta = clocksource_delta(cycle_now, tk->tkr_mono.cycle_last, tk->tkr_mono.mask); |
679 | tk->tkr_mono.cycle_last = cycle_now; | |
4a4ad80d | 680 | tk->tkr_raw.cycle_last = cycle_now; |
8524070b | 681 | |
876e7881 | 682 | tk->tkr_mono.xtime_nsec += delta * tk->tkr_mono.mult; |
7d27558c | 683 | |
7b1f6207 | 684 | /* If arch requires, add in get_arch_timeoffset() */ |
876e7881 | 685 | tk->tkr_mono.xtime_nsec += (u64)arch_gettimeoffset() << tk->tkr_mono.shift; |
7d27558c | 686 | |
f726a697 | 687 | tk_normalize_xtime(tk); |
2d42244a | 688 | |
4a4ad80d | 689 | nsec = clocksource_cyc2ns(delta, tk->tkr_raw.mult, tk->tkr_raw.shift); |
7d489d15 | 690 | timespec64_add_ns(&tk->raw_time, nsec); |
8524070b JS |
691 | } |
692 | ||
693 | /** | |
d6d29896 | 694 | * __getnstimeofday64 - Returns the time of day in a timespec64. |
8524070b JS |
695 | * @ts: pointer to the timespec to be set |
696 | * | |
1e817fb6 KC |
697 | * Updates the time of day in the timespec. |
698 | * Returns 0 on success, or -ve when suspended (timespec will be undefined). | |
8524070b | 699 | */ |
d6d29896 | 700 | int __getnstimeofday64(struct timespec64 *ts) |
8524070b | 701 | { |
3fdb14fd | 702 | struct timekeeper *tk = &tk_core.timekeeper; |
8524070b | 703 | unsigned long seq; |
acc89612 | 704 | u64 nsecs; |
8524070b JS |
705 | |
706 | do { | |
3fdb14fd | 707 | seq = read_seqcount_begin(&tk_core.seq); |
8524070b | 708 | |
4e250fdd | 709 | ts->tv_sec = tk->xtime_sec; |
876e7881 | 710 | nsecs = timekeeping_get_ns(&tk->tkr_mono); |
8524070b | 711 | |
3fdb14fd | 712 | } while (read_seqcount_retry(&tk_core.seq, seq)); |
8524070b | 713 | |
ec145bab | 714 | ts->tv_nsec = 0; |
d6d29896 | 715 | timespec64_add_ns(ts, nsecs); |
1e817fb6 KC |
716 | |
717 | /* | |
718 | * Do not bail out early, in case there were callers still using | |
719 | * the value, even in the face of the WARN_ON. | |
720 | */ | |
721 | if (unlikely(timekeeping_suspended)) | |
722 | return -EAGAIN; | |
723 | return 0; | |
724 | } | |
d6d29896 | 725 | EXPORT_SYMBOL(__getnstimeofday64); |
1e817fb6 KC |
726 | |
727 | /** | |
d6d29896 | 728 | * getnstimeofday64 - Returns the time of day in a timespec64. |
5322e4c2 | 729 | * @ts: pointer to the timespec64 to be set |
1e817fb6 | 730 | * |
5322e4c2 | 731 | * Returns the time of day in a timespec64 (WARN if suspended). |
1e817fb6 | 732 | */ |
d6d29896 | 733 | void getnstimeofday64(struct timespec64 *ts) |
1e817fb6 | 734 | { |
d6d29896 | 735 | WARN_ON(__getnstimeofday64(ts)); |
8524070b | 736 | } |
d6d29896 | 737 | EXPORT_SYMBOL(getnstimeofday64); |
8524070b | 738 | |
951ed4d3 MS |
739 | ktime_t ktime_get(void) |
740 | { | |
3fdb14fd | 741 | struct timekeeper *tk = &tk_core.timekeeper; |
951ed4d3 | 742 | unsigned int seq; |
a016a5bd | 743 | ktime_t base; |
acc89612 | 744 | u64 nsecs; |
951ed4d3 MS |
745 | |
746 | WARN_ON(timekeeping_suspended); | |
747 | ||
748 | do { | |
3fdb14fd | 749 | seq = read_seqcount_begin(&tk_core.seq); |
876e7881 PZ |
750 | base = tk->tkr_mono.base; |
751 | nsecs = timekeeping_get_ns(&tk->tkr_mono); | |
951ed4d3 | 752 | |
3fdb14fd | 753 | } while (read_seqcount_retry(&tk_core.seq, seq)); |
24e4a8c3 | 754 | |
a016a5bd | 755 | return ktime_add_ns(base, nsecs); |
951ed4d3 MS |
756 | } |
757 | EXPORT_SYMBOL_GPL(ktime_get); | |
758 | ||
6374f912 HG |
759 | u32 ktime_get_resolution_ns(void) |
760 | { | |
761 | struct timekeeper *tk = &tk_core.timekeeper; | |
762 | unsigned int seq; | |
763 | u32 nsecs; | |
764 | ||
765 | WARN_ON(timekeeping_suspended); | |
766 | ||
767 | do { | |
768 | seq = read_seqcount_begin(&tk_core.seq); | |
769 | nsecs = tk->tkr_mono.mult >> tk->tkr_mono.shift; | |
770 | } while (read_seqcount_retry(&tk_core.seq, seq)); | |
771 | ||
772 | return nsecs; | |
773 | } | |
774 | EXPORT_SYMBOL_GPL(ktime_get_resolution_ns); | |
775 | ||
0077dc60 TG |
776 | static ktime_t *offsets[TK_OFFS_MAX] = { |
777 | [TK_OFFS_REAL] = &tk_core.timekeeper.offs_real, | |
778 | [TK_OFFS_BOOT] = &tk_core.timekeeper.offs_boot, | |
779 | [TK_OFFS_TAI] = &tk_core.timekeeper.offs_tai, | |
780 | }; | |
781 | ||
782 | ktime_t ktime_get_with_offset(enum tk_offsets offs) | |
783 | { | |
784 | struct timekeeper *tk = &tk_core.timekeeper; | |
785 | unsigned int seq; | |
786 | ktime_t base, *offset = offsets[offs]; | |
acc89612 | 787 | u64 nsecs; |
0077dc60 TG |
788 | |
789 | WARN_ON(timekeeping_suspended); | |
790 | ||
791 | do { | |
792 | seq = read_seqcount_begin(&tk_core.seq); | |
876e7881 PZ |
793 | base = ktime_add(tk->tkr_mono.base, *offset); |
794 | nsecs = timekeeping_get_ns(&tk->tkr_mono); | |
0077dc60 TG |
795 | |
796 | } while (read_seqcount_retry(&tk_core.seq, seq)); | |
797 | ||
798 | return ktime_add_ns(base, nsecs); | |
799 | ||
800 | } | |
801 | EXPORT_SYMBOL_GPL(ktime_get_with_offset); | |
802 | ||
9a6b5197 TG |
803 | /** |
804 | * ktime_mono_to_any() - convert mononotic time to any other time | |
805 | * @tmono: time to convert. | |
806 | * @offs: which offset to use | |
807 | */ | |
808 | ktime_t ktime_mono_to_any(ktime_t tmono, enum tk_offsets offs) | |
809 | { | |
810 | ktime_t *offset = offsets[offs]; | |
811 | unsigned long seq; | |
812 | ktime_t tconv; | |
813 | ||
814 | do { | |
815 | seq = read_seqcount_begin(&tk_core.seq); | |
816 | tconv = ktime_add(tmono, *offset); | |
817 | } while (read_seqcount_retry(&tk_core.seq, seq)); | |
818 | ||
819 | return tconv; | |
820 | } | |
821 | EXPORT_SYMBOL_GPL(ktime_mono_to_any); | |
822 | ||
f519b1a2 TG |
823 | /** |
824 | * ktime_get_raw - Returns the raw monotonic time in ktime_t format | |
825 | */ | |
826 | ktime_t ktime_get_raw(void) | |
827 | { | |
828 | struct timekeeper *tk = &tk_core.timekeeper; | |
829 | unsigned int seq; | |
830 | ktime_t base; | |
acc89612 | 831 | u64 nsecs; |
f519b1a2 TG |
832 | |
833 | do { | |
834 | seq = read_seqcount_begin(&tk_core.seq); | |
4a4ad80d PZ |
835 | base = tk->tkr_raw.base; |
836 | nsecs = timekeeping_get_ns(&tk->tkr_raw); | |
f519b1a2 TG |
837 | |
838 | } while (read_seqcount_retry(&tk_core.seq, seq)); | |
839 | ||
840 | return ktime_add_ns(base, nsecs); | |
841 | } | |
842 | EXPORT_SYMBOL_GPL(ktime_get_raw); | |
843 | ||
951ed4d3 | 844 | /** |
d6d29896 | 845 | * ktime_get_ts64 - get the monotonic clock in timespec64 format |
951ed4d3 MS |
846 | * @ts: pointer to timespec variable |
847 | * | |
848 | * The function calculates the monotonic clock from the realtime | |
849 | * clock and the wall_to_monotonic offset and stores the result | |
5322e4c2 | 850 | * in normalized timespec64 format in the variable pointed to by @ts. |
951ed4d3 | 851 | */ |
d6d29896 | 852 | void ktime_get_ts64(struct timespec64 *ts) |
951ed4d3 | 853 | { |
3fdb14fd | 854 | struct timekeeper *tk = &tk_core.timekeeper; |
d6d29896 | 855 | struct timespec64 tomono; |
951ed4d3 | 856 | unsigned int seq; |
acc89612 | 857 | u64 nsec; |
951ed4d3 MS |
858 | |
859 | WARN_ON(timekeeping_suspended); | |
860 | ||
861 | do { | |
3fdb14fd | 862 | seq = read_seqcount_begin(&tk_core.seq); |
d6d29896 | 863 | ts->tv_sec = tk->xtime_sec; |
876e7881 | 864 | nsec = timekeeping_get_ns(&tk->tkr_mono); |
4e250fdd | 865 | tomono = tk->wall_to_monotonic; |
951ed4d3 | 866 | |
3fdb14fd | 867 | } while (read_seqcount_retry(&tk_core.seq, seq)); |
951ed4d3 | 868 | |
d6d29896 TG |
869 | ts->tv_sec += tomono.tv_sec; |
870 | ts->tv_nsec = 0; | |
871 | timespec64_add_ns(ts, nsec + tomono.tv_nsec); | |
951ed4d3 | 872 | } |
d6d29896 | 873 | EXPORT_SYMBOL_GPL(ktime_get_ts64); |
951ed4d3 | 874 | |
9e3680b1 HS |
875 | /** |
876 | * ktime_get_seconds - Get the seconds portion of CLOCK_MONOTONIC | |
877 | * | |
878 | * Returns the seconds portion of CLOCK_MONOTONIC with a single non | |
879 | * serialized read. tk->ktime_sec is of type 'unsigned long' so this | |
880 | * works on both 32 and 64 bit systems. On 32 bit systems the readout | |
881 | * covers ~136 years of uptime which should be enough to prevent | |
882 | * premature wrap arounds. | |
883 | */ | |
884 | time64_t ktime_get_seconds(void) | |
885 | { | |
886 | struct timekeeper *tk = &tk_core.timekeeper; | |
887 | ||
888 | WARN_ON(timekeeping_suspended); | |
889 | return tk->ktime_sec; | |
890 | } | |
891 | EXPORT_SYMBOL_GPL(ktime_get_seconds); | |
892 | ||
dbe7aa62 HS |
893 | /** |
894 | * ktime_get_real_seconds - Get the seconds portion of CLOCK_REALTIME | |
895 | * | |
896 | * Returns the wall clock seconds since 1970. This replaces the | |
897 | * get_seconds() interface which is not y2038 safe on 32bit systems. | |
898 | * | |
899 | * For 64bit systems the fast access to tk->xtime_sec is preserved. On | |
900 | * 32bit systems the access must be protected with the sequence | |
901 | * counter to provide "atomic" access to the 64bit tk->xtime_sec | |
902 | * value. | |
903 | */ | |
904 | time64_t ktime_get_real_seconds(void) | |
905 | { | |
906 | struct timekeeper *tk = &tk_core.timekeeper; | |
907 | time64_t seconds; | |
908 | unsigned int seq; | |
909 | ||
910 | if (IS_ENABLED(CONFIG_64BIT)) | |
911 | return tk->xtime_sec; | |
912 | ||
913 | do { | |
914 | seq = read_seqcount_begin(&tk_core.seq); | |
915 | seconds = tk->xtime_sec; | |
916 | ||
917 | } while (read_seqcount_retry(&tk_core.seq, seq)); | |
918 | ||
919 | return seconds; | |
920 | } | |
921 | EXPORT_SYMBOL_GPL(ktime_get_real_seconds); | |
922 | ||
dee36654 D |
923 | /** |
924 | * __ktime_get_real_seconds - The same as ktime_get_real_seconds | |
925 | * but without the sequence counter protect. This internal function | |
926 | * is called just when timekeeping lock is already held. | |
927 | */ | |
928 | time64_t __ktime_get_real_seconds(void) | |
929 | { | |
930 | struct timekeeper *tk = &tk_core.timekeeper; | |
931 | ||
932 | return tk->xtime_sec; | |
933 | } | |
934 | ||
9da0f49c CH |
935 | /** |
936 | * ktime_get_snapshot - snapshots the realtime/monotonic raw clocks with counter | |
937 | * @systime_snapshot: pointer to struct receiving the system time snapshot | |
938 | */ | |
939 | void ktime_get_snapshot(struct system_time_snapshot *systime_snapshot) | |
940 | { | |
941 | struct timekeeper *tk = &tk_core.timekeeper; | |
942 | unsigned long seq; | |
943 | ktime_t base_raw; | |
944 | ktime_t base_real; | |
acc89612 TG |
945 | u64 nsec_raw; |
946 | u64 nsec_real; | |
a5a1d1c2 | 947 | u64 now; |
9da0f49c | 948 | |
ba26621e CH |
949 | WARN_ON_ONCE(timekeeping_suspended); |
950 | ||
9da0f49c CH |
951 | do { |
952 | seq = read_seqcount_begin(&tk_core.seq); | |
ceea5e37 | 953 | now = tk_clock_read(&tk->tkr_mono); |
2c756feb CH |
954 | systime_snapshot->cs_was_changed_seq = tk->cs_was_changed_seq; |
955 | systime_snapshot->clock_was_set_seq = tk->clock_was_set_seq; | |
9da0f49c CH |
956 | base_real = ktime_add(tk->tkr_mono.base, |
957 | tk_core.timekeeper.offs_real); | |
958 | base_raw = tk->tkr_raw.base; | |
959 | nsec_real = timekeeping_cycles_to_ns(&tk->tkr_mono, now); | |
960 | nsec_raw = timekeeping_cycles_to_ns(&tk->tkr_raw, now); | |
961 | } while (read_seqcount_retry(&tk_core.seq, seq)); | |
962 | ||
963 | systime_snapshot->cycles = now; | |
964 | systime_snapshot->real = ktime_add_ns(base_real, nsec_real); | |
965 | systime_snapshot->raw = ktime_add_ns(base_raw, nsec_raw); | |
966 | } | |
967 | EXPORT_SYMBOL_GPL(ktime_get_snapshot); | |
dee36654 | 968 | |
2c756feb CH |
969 | /* Scale base by mult/div checking for overflow */ |
970 | static int scale64_check_overflow(u64 mult, u64 div, u64 *base) | |
971 | { | |
972 | u64 tmp, rem; | |
973 | ||
974 | tmp = div64_u64_rem(*base, div, &rem); | |
975 | ||
976 | if (((int)sizeof(u64)*8 - fls64(mult) < fls64(tmp)) || | |
977 | ((int)sizeof(u64)*8 - fls64(mult) < fls64(rem))) | |
978 | return -EOVERFLOW; | |
979 | tmp *= mult; | |
980 | rem *= mult; | |
981 | ||
982 | do_div(rem, div); | |
983 | *base = tmp + rem; | |
984 | return 0; | |
985 | } | |
986 | ||
987 | /** | |
988 | * adjust_historical_crosststamp - adjust crosstimestamp previous to current interval | |
989 | * @history: Snapshot representing start of history | |
990 | * @partial_history_cycles: Cycle offset into history (fractional part) | |
991 | * @total_history_cycles: Total history length in cycles | |
992 | * @discontinuity: True indicates clock was set on history period | |
993 | * @ts: Cross timestamp that should be adjusted using | |
994 | * partial/total ratio | |
995 | * | |
996 | * Helper function used by get_device_system_crosststamp() to correct the | |
997 | * crosstimestamp corresponding to the start of the current interval to the | |
998 | * system counter value (timestamp point) provided by the driver. The | |
999 | * total_history_* quantities are the total history starting at the provided | |
1000 | * reference point and ending at the start of the current interval. The cycle | |
1001 | * count between the driver timestamp point and the start of the current | |
1002 | * interval is partial_history_cycles. | |
1003 | */ | |
1004 | static int adjust_historical_crosststamp(struct system_time_snapshot *history, | |
a5a1d1c2 TG |
1005 | u64 partial_history_cycles, |
1006 | u64 total_history_cycles, | |
2c756feb CH |
1007 | bool discontinuity, |
1008 | struct system_device_crosststamp *ts) | |
1009 | { | |
1010 | struct timekeeper *tk = &tk_core.timekeeper; | |
1011 | u64 corr_raw, corr_real; | |
1012 | bool interp_forward; | |
1013 | int ret; | |
1014 | ||
1015 | if (total_history_cycles == 0 || partial_history_cycles == 0) | |
1016 | return 0; | |
1017 | ||
1018 | /* Interpolate shortest distance from beginning or end of history */ | |
5fc63f95 | 1019 | interp_forward = partial_history_cycles > total_history_cycles / 2; |
2c756feb CH |
1020 | partial_history_cycles = interp_forward ? |
1021 | total_history_cycles - partial_history_cycles : | |
1022 | partial_history_cycles; | |
1023 | ||
1024 | /* | |
1025 | * Scale the monotonic raw time delta by: | |
1026 | * partial_history_cycles / total_history_cycles | |
1027 | */ | |
1028 | corr_raw = (u64)ktime_to_ns( | |
1029 | ktime_sub(ts->sys_monoraw, history->raw)); | |
1030 | ret = scale64_check_overflow(partial_history_cycles, | |
1031 | total_history_cycles, &corr_raw); | |
1032 | if (ret) | |
1033 | return ret; | |
1034 | ||
1035 | /* | |
1036 | * If there is a discontinuity in the history, scale monotonic raw | |
1037 | * correction by: | |
1038 | * mult(real)/mult(raw) yielding the realtime correction | |
1039 | * Otherwise, calculate the realtime correction similar to monotonic | |
1040 | * raw calculation | |
1041 | */ | |
1042 | if (discontinuity) { | |
1043 | corr_real = mul_u64_u32_div | |
1044 | (corr_raw, tk->tkr_mono.mult, tk->tkr_raw.mult); | |
1045 | } else { | |
1046 | corr_real = (u64)ktime_to_ns( | |
1047 | ktime_sub(ts->sys_realtime, history->real)); | |
1048 | ret = scale64_check_overflow(partial_history_cycles, | |
1049 | total_history_cycles, &corr_real); | |
1050 | if (ret) | |
1051 | return ret; | |
1052 | } | |
1053 | ||
1054 | /* Fixup monotonic raw and real time time values */ | |
1055 | if (interp_forward) { | |
1056 | ts->sys_monoraw = ktime_add_ns(history->raw, corr_raw); | |
1057 | ts->sys_realtime = ktime_add_ns(history->real, corr_real); | |
1058 | } else { | |
1059 | ts->sys_monoraw = ktime_sub_ns(ts->sys_monoraw, corr_raw); | |
1060 | ts->sys_realtime = ktime_sub_ns(ts->sys_realtime, corr_real); | |
1061 | } | |
1062 | ||
1063 | return 0; | |
1064 | } | |
1065 | ||
1066 | /* | |
1067 | * cycle_between - true if test occurs chronologically between before and after | |
1068 | */ | |
a5a1d1c2 | 1069 | static bool cycle_between(u64 before, u64 test, u64 after) |
2c756feb CH |
1070 | { |
1071 | if (test > before && test < after) | |
1072 | return true; | |
1073 | if (test < before && before > after) | |
1074 | return true; | |
1075 | return false; | |
1076 | } | |
1077 | ||
8006c245 CH |
1078 | /** |
1079 | * get_device_system_crosststamp - Synchronously capture system/device timestamp | |
2c756feb | 1080 | * @get_time_fn: Callback to get simultaneous device time and |
8006c245 | 1081 | * system counter from the device driver |
2c756feb CH |
1082 | * @ctx: Context passed to get_time_fn() |
1083 | * @history_begin: Historical reference point used to interpolate system | |
1084 | * time when counter provided by the driver is before the current interval | |
8006c245 CH |
1085 | * @xtstamp: Receives simultaneously captured system and device time |
1086 | * | |
1087 | * Reads a timestamp from a device and correlates it to system time | |
1088 | */ | |
1089 | int get_device_system_crosststamp(int (*get_time_fn) | |
1090 | (ktime_t *device_time, | |
1091 | struct system_counterval_t *sys_counterval, | |
1092 | void *ctx), | |
1093 | void *ctx, | |
2c756feb | 1094 | struct system_time_snapshot *history_begin, |
8006c245 CH |
1095 | struct system_device_crosststamp *xtstamp) |
1096 | { | |
1097 | struct system_counterval_t system_counterval; | |
1098 | struct timekeeper *tk = &tk_core.timekeeper; | |
a5a1d1c2 | 1099 | u64 cycles, now, interval_start; |
6436257b | 1100 | unsigned int clock_was_set_seq = 0; |
8006c245 | 1101 | ktime_t base_real, base_raw; |
acc89612 | 1102 | u64 nsec_real, nsec_raw; |
2c756feb | 1103 | u8 cs_was_changed_seq; |
8006c245 | 1104 | unsigned long seq; |
2c756feb | 1105 | bool do_interp; |
8006c245 CH |
1106 | int ret; |
1107 | ||
1108 | do { | |
1109 | seq = read_seqcount_begin(&tk_core.seq); | |
1110 | /* | |
1111 | * Try to synchronously capture device time and a system | |
1112 | * counter value calling back into the device driver | |
1113 | */ | |
1114 | ret = get_time_fn(&xtstamp->device, &system_counterval, ctx); | |
1115 | if (ret) | |
1116 | return ret; | |
1117 | ||
1118 | /* | |
1119 | * Verify that the clocksource associated with the captured | |
1120 | * system counter value is the same as the currently installed | |
1121 | * timekeeper clocksource | |
1122 | */ | |
1123 | if (tk->tkr_mono.clock != system_counterval.cs) | |
1124 | return -ENODEV; | |
2c756feb CH |
1125 | cycles = system_counterval.cycles; |
1126 | ||
1127 | /* | |
1128 | * Check whether the system counter value provided by the | |
1129 | * device driver is on the current timekeeping interval. | |
1130 | */ | |
ceea5e37 | 1131 | now = tk_clock_read(&tk->tkr_mono); |
2c756feb CH |
1132 | interval_start = tk->tkr_mono.cycle_last; |
1133 | if (!cycle_between(interval_start, cycles, now)) { | |
1134 | clock_was_set_seq = tk->clock_was_set_seq; | |
1135 | cs_was_changed_seq = tk->cs_was_changed_seq; | |
1136 | cycles = interval_start; | |
1137 | do_interp = true; | |
1138 | } else { | |
1139 | do_interp = false; | |
1140 | } | |
8006c245 CH |
1141 | |
1142 | base_real = ktime_add(tk->tkr_mono.base, | |
1143 | tk_core.timekeeper.offs_real); | |
1144 | base_raw = tk->tkr_raw.base; | |
1145 | ||
1146 | nsec_real = timekeeping_cycles_to_ns(&tk->tkr_mono, | |
1147 | system_counterval.cycles); | |
1148 | nsec_raw = timekeeping_cycles_to_ns(&tk->tkr_raw, | |
1149 | system_counterval.cycles); | |
1150 | } while (read_seqcount_retry(&tk_core.seq, seq)); | |
1151 | ||
1152 | xtstamp->sys_realtime = ktime_add_ns(base_real, nsec_real); | |
1153 | xtstamp->sys_monoraw = ktime_add_ns(base_raw, nsec_raw); | |
2c756feb CH |
1154 | |
1155 | /* | |
1156 | * Interpolate if necessary, adjusting back from the start of the | |
1157 | * current interval | |
1158 | */ | |
1159 | if (do_interp) { | |
a5a1d1c2 | 1160 | u64 partial_history_cycles, total_history_cycles; |
2c756feb CH |
1161 | bool discontinuity; |
1162 | ||
1163 | /* | |
1164 | * Check that the counter value occurs after the provided | |
1165 | * history reference and that the history doesn't cross a | |
1166 | * clocksource change | |
1167 | */ | |
1168 | if (!history_begin || | |
1169 | !cycle_between(history_begin->cycles, | |
1170 | system_counterval.cycles, cycles) || | |
1171 | history_begin->cs_was_changed_seq != cs_was_changed_seq) | |
1172 | return -EINVAL; | |
1173 | partial_history_cycles = cycles - system_counterval.cycles; | |
1174 | total_history_cycles = cycles - history_begin->cycles; | |
1175 | discontinuity = | |
1176 | history_begin->clock_was_set_seq != clock_was_set_seq; | |
1177 | ||
1178 | ret = adjust_historical_crosststamp(history_begin, | |
1179 | partial_history_cycles, | |
1180 | total_history_cycles, | |
1181 | discontinuity, xtstamp); | |
1182 | if (ret) | |
1183 | return ret; | |
1184 | } | |
1185 | ||
8006c245 CH |
1186 | return 0; |
1187 | } | |
1188 | EXPORT_SYMBOL_GPL(get_device_system_crosststamp); | |
1189 | ||
8524070b JS |
1190 | /** |
1191 | * do_gettimeofday - Returns the time of day in a timeval | |
1192 | * @tv: pointer to the timeval to be set | |
1193 | * | |
efd9ac86 | 1194 | * NOTE: Users should be converted to using getnstimeofday() |
8524070b JS |
1195 | */ |
1196 | void do_gettimeofday(struct timeval *tv) | |
1197 | { | |
d6d29896 | 1198 | struct timespec64 now; |
8524070b | 1199 | |
d6d29896 | 1200 | getnstimeofday64(&now); |
8524070b JS |
1201 | tv->tv_sec = now.tv_sec; |
1202 | tv->tv_usec = now.tv_nsec/1000; | |
1203 | } | |
8524070b | 1204 | EXPORT_SYMBOL(do_gettimeofday); |
d239f49d | 1205 | |
8524070b | 1206 | /** |
21f7eca5 | 1207 | * do_settimeofday64 - Sets the time of day. |
1208 | * @ts: pointer to the timespec64 variable containing the new time | |
8524070b JS |
1209 | * |
1210 | * Sets the time of day to the new time and update NTP and notify hrtimers | |
1211 | */ | |
21f7eca5 | 1212 | int do_settimeofday64(const struct timespec64 *ts) |
8524070b | 1213 | { |
3fdb14fd | 1214 | struct timekeeper *tk = &tk_core.timekeeper; |
21f7eca5 | 1215 | struct timespec64 ts_delta, xt; |
92c1d3ed | 1216 | unsigned long flags; |
e1d7ba87 | 1217 | int ret = 0; |
8524070b | 1218 | |
21f7eca5 | 1219 | if (!timespec64_valid_strict(ts)) |
8524070b JS |
1220 | return -EINVAL; |
1221 | ||
9a7a71b1 | 1222 | raw_spin_lock_irqsave(&timekeeper_lock, flags); |
3fdb14fd | 1223 | write_seqcount_begin(&tk_core.seq); |
8524070b | 1224 | |
4e250fdd | 1225 | timekeeping_forward_now(tk); |
9a055117 | 1226 | |
4e250fdd | 1227 | xt = tk_xtime(tk); |
21f7eca5 | 1228 | ts_delta.tv_sec = ts->tv_sec - xt.tv_sec; |
1229 | ts_delta.tv_nsec = ts->tv_nsec - xt.tv_nsec; | |
1e75fa8b | 1230 | |
e1d7ba87 WY |
1231 | if (timespec64_compare(&tk->wall_to_monotonic, &ts_delta) > 0) { |
1232 | ret = -EINVAL; | |
1233 | goto out; | |
1234 | } | |
1235 | ||
7d489d15 | 1236 | tk_set_wall_to_mono(tk, timespec64_sub(tk->wall_to_monotonic, ts_delta)); |
8524070b | 1237 | |
21f7eca5 | 1238 | tk_set_xtime(tk, ts); |
e1d7ba87 | 1239 | out: |
780427f0 | 1240 | timekeeping_update(tk, TK_CLEAR_NTP | TK_MIRROR | TK_CLOCK_WAS_SET); |
8524070b | 1241 | |
3fdb14fd | 1242 | write_seqcount_end(&tk_core.seq); |
9a7a71b1 | 1243 | raw_spin_unlock_irqrestore(&timekeeper_lock, flags); |
8524070b JS |
1244 | |
1245 | /* signal hrtimers about time change */ | |
1246 | clock_was_set(); | |
1247 | ||
e1d7ba87 | 1248 | return ret; |
8524070b | 1249 | } |
21f7eca5 | 1250 | EXPORT_SYMBOL(do_settimeofday64); |
8524070b | 1251 | |
c528f7c6 JS |
1252 | /** |
1253 | * timekeeping_inject_offset - Adds or subtracts from the current time. | |
1254 | * @tv: pointer to the timespec variable containing the offset | |
1255 | * | |
1256 | * Adds or subtracts an offset value from the current time. | |
1257 | */ | |
1258 | int timekeeping_inject_offset(struct timespec *ts) | |
1259 | { | |
3fdb14fd | 1260 | struct timekeeper *tk = &tk_core.timekeeper; |
92c1d3ed | 1261 | unsigned long flags; |
7d489d15 | 1262 | struct timespec64 ts64, tmp; |
4e8b1452 | 1263 | int ret = 0; |
c528f7c6 | 1264 | |
37cf4dc3 | 1265 | if (!timespec_inject_offset_valid(ts)) |
c528f7c6 JS |
1266 | return -EINVAL; |
1267 | ||
7d489d15 JS |
1268 | ts64 = timespec_to_timespec64(*ts); |
1269 | ||
9a7a71b1 | 1270 | raw_spin_lock_irqsave(&timekeeper_lock, flags); |
3fdb14fd | 1271 | write_seqcount_begin(&tk_core.seq); |
c528f7c6 | 1272 | |
4e250fdd | 1273 | timekeeping_forward_now(tk); |
c528f7c6 | 1274 | |
4e8b1452 | 1275 | /* Make sure the proposed value is valid */ |
7d489d15 | 1276 | tmp = timespec64_add(tk_xtime(tk), ts64); |
e1d7ba87 WY |
1277 | if (timespec64_compare(&tk->wall_to_monotonic, &ts64) > 0 || |
1278 | !timespec64_valid_strict(&tmp)) { | |
4e8b1452 JS |
1279 | ret = -EINVAL; |
1280 | goto error; | |
1281 | } | |
1e75fa8b | 1282 | |
7d489d15 JS |
1283 | tk_xtime_add(tk, &ts64); |
1284 | tk_set_wall_to_mono(tk, timespec64_sub(tk->wall_to_monotonic, ts64)); | |
c528f7c6 | 1285 | |
4e8b1452 | 1286 | error: /* even if we error out, we forwarded the time, so call update */ |
780427f0 | 1287 | timekeeping_update(tk, TK_CLEAR_NTP | TK_MIRROR | TK_CLOCK_WAS_SET); |
c528f7c6 | 1288 | |
3fdb14fd | 1289 | write_seqcount_end(&tk_core.seq); |
9a7a71b1 | 1290 | raw_spin_unlock_irqrestore(&timekeeper_lock, flags); |
c528f7c6 JS |
1291 | |
1292 | /* signal hrtimers about time change */ | |
1293 | clock_was_set(); | |
1294 | ||
4e8b1452 | 1295 | return ret; |
c528f7c6 JS |
1296 | } |
1297 | EXPORT_SYMBOL(timekeeping_inject_offset); | |
1298 | ||
cc244dda | 1299 | /** |
40d9f827 | 1300 | * __timekeeping_set_tai_offset - Sets the TAI offset from UTC and monotonic |
cc244dda JS |
1301 | * |
1302 | */ | |
dd5d70e8 | 1303 | static void __timekeeping_set_tai_offset(struct timekeeper *tk, s32 tai_offset) |
cc244dda JS |
1304 | { |
1305 | tk->tai_offset = tai_offset; | |
04005f60 | 1306 | tk->offs_tai = ktime_add(tk->offs_real, ktime_set(tai_offset, 0)); |
cc244dda JS |
1307 | } |
1308 | ||
8524070b JS |
1309 | /** |
1310 | * change_clocksource - Swaps clocksources if a new one is available | |
1311 | * | |
1312 | * Accumulates current time interval and initializes new clocksource | |
1313 | */ | |
75c5158f | 1314 | static int change_clocksource(void *data) |
8524070b | 1315 | { |
3fdb14fd | 1316 | struct timekeeper *tk = &tk_core.timekeeper; |
4614e6ad | 1317 | struct clocksource *new, *old; |
f695cf94 | 1318 | unsigned long flags; |
8524070b | 1319 | |
75c5158f | 1320 | new = (struct clocksource *) data; |
8524070b | 1321 | |
9a7a71b1 | 1322 | raw_spin_lock_irqsave(&timekeeper_lock, flags); |
3fdb14fd | 1323 | write_seqcount_begin(&tk_core.seq); |
f695cf94 | 1324 | |
4e250fdd | 1325 | timekeeping_forward_now(tk); |
09ac369c TG |
1326 | /* |
1327 | * If the cs is in module, get a module reference. Succeeds | |
1328 | * for built-in code (owner == NULL) as well. | |
1329 | */ | |
1330 | if (try_module_get(new->owner)) { | |
1331 | if (!new->enable || new->enable(new) == 0) { | |
876e7881 | 1332 | old = tk->tkr_mono.clock; |
09ac369c TG |
1333 | tk_setup_internals(tk, new); |
1334 | if (old->disable) | |
1335 | old->disable(old); | |
1336 | module_put(old->owner); | |
1337 | } else { | |
1338 | module_put(new->owner); | |
1339 | } | |
75c5158f | 1340 | } |
780427f0 | 1341 | timekeeping_update(tk, TK_CLEAR_NTP | TK_MIRROR | TK_CLOCK_WAS_SET); |
f695cf94 | 1342 | |
3fdb14fd | 1343 | write_seqcount_end(&tk_core.seq); |
9a7a71b1 | 1344 | raw_spin_unlock_irqrestore(&timekeeper_lock, flags); |
f695cf94 | 1345 | |
75c5158f MS |
1346 | return 0; |
1347 | } | |
8524070b | 1348 | |
75c5158f MS |
1349 | /** |
1350 | * timekeeping_notify - Install a new clock source | |
1351 | * @clock: pointer to the clock source | |
1352 | * | |
1353 | * This function is called from clocksource.c after a new, better clock | |
1354 | * source has been registered. The caller holds the clocksource_mutex. | |
1355 | */ | |
ba919d1c | 1356 | int timekeeping_notify(struct clocksource *clock) |
75c5158f | 1357 | { |
3fdb14fd | 1358 | struct timekeeper *tk = &tk_core.timekeeper; |
4e250fdd | 1359 | |
876e7881 | 1360 | if (tk->tkr_mono.clock == clock) |
ba919d1c | 1361 | return 0; |
75c5158f | 1362 | stop_machine(change_clocksource, clock, NULL); |
8524070b | 1363 | tick_clock_notify(); |
876e7881 | 1364 | return tk->tkr_mono.clock == clock ? 0 : -1; |
8524070b | 1365 | } |
75c5158f | 1366 | |
2d42244a | 1367 | /** |
cdba2ec5 JS |
1368 | * getrawmonotonic64 - Returns the raw monotonic time in a timespec |
1369 | * @ts: pointer to the timespec64 to be set | |
2d42244a JS |
1370 | * |
1371 | * Returns the raw monotonic time (completely un-modified by ntp) | |
1372 | */ | |
cdba2ec5 | 1373 | void getrawmonotonic64(struct timespec64 *ts) |
2d42244a | 1374 | { |
3fdb14fd | 1375 | struct timekeeper *tk = &tk_core.timekeeper; |
7d489d15 | 1376 | struct timespec64 ts64; |
2d42244a | 1377 | unsigned long seq; |
acc89612 | 1378 | u64 nsecs; |
2d42244a JS |
1379 | |
1380 | do { | |
3fdb14fd | 1381 | seq = read_seqcount_begin(&tk_core.seq); |
4a4ad80d | 1382 | nsecs = timekeeping_get_ns(&tk->tkr_raw); |
7d489d15 | 1383 | ts64 = tk->raw_time; |
2d42244a | 1384 | |
3fdb14fd | 1385 | } while (read_seqcount_retry(&tk_core.seq, seq)); |
2d42244a | 1386 | |
7d489d15 | 1387 | timespec64_add_ns(&ts64, nsecs); |
cdba2ec5 | 1388 | *ts = ts64; |
2d42244a | 1389 | } |
cdba2ec5 JS |
1390 | EXPORT_SYMBOL(getrawmonotonic64); |
1391 | ||
2d42244a | 1392 | |
8524070b | 1393 | /** |
cf4fc6cb | 1394 | * timekeeping_valid_for_hres - Check if timekeeping is suitable for hres |
8524070b | 1395 | */ |
cf4fc6cb | 1396 | int timekeeping_valid_for_hres(void) |
8524070b | 1397 | { |
3fdb14fd | 1398 | struct timekeeper *tk = &tk_core.timekeeper; |
8524070b JS |
1399 | unsigned long seq; |
1400 | int ret; | |
1401 | ||
1402 | do { | |
3fdb14fd | 1403 | seq = read_seqcount_begin(&tk_core.seq); |
8524070b | 1404 | |
876e7881 | 1405 | ret = tk->tkr_mono.clock->flags & CLOCK_SOURCE_VALID_FOR_HRES; |
8524070b | 1406 | |
3fdb14fd | 1407 | } while (read_seqcount_retry(&tk_core.seq, seq)); |
8524070b JS |
1408 | |
1409 | return ret; | |
1410 | } | |
1411 | ||
98962465 JH |
1412 | /** |
1413 | * timekeeping_max_deferment - Returns max time the clocksource can be deferred | |
98962465 JH |
1414 | */ |
1415 | u64 timekeeping_max_deferment(void) | |
1416 | { | |
3fdb14fd | 1417 | struct timekeeper *tk = &tk_core.timekeeper; |
70471f2f JS |
1418 | unsigned long seq; |
1419 | u64 ret; | |
42e71e81 | 1420 | |
70471f2f | 1421 | do { |
3fdb14fd | 1422 | seq = read_seqcount_begin(&tk_core.seq); |
70471f2f | 1423 | |
876e7881 | 1424 | ret = tk->tkr_mono.clock->max_idle_ns; |
70471f2f | 1425 | |
3fdb14fd | 1426 | } while (read_seqcount_retry(&tk_core.seq, seq)); |
70471f2f JS |
1427 | |
1428 | return ret; | |
98962465 JH |
1429 | } |
1430 | ||
8524070b | 1431 | /** |
d4f587c6 | 1432 | * read_persistent_clock - Return time from the persistent clock. |
8524070b JS |
1433 | * |
1434 | * Weak dummy function for arches that do not yet support it. | |
d4f587c6 MS |
1435 | * Reads the time from the battery backed persistent clock. |
1436 | * Returns a timespec with tv_sec=0 and tv_nsec=0 if unsupported. | |
8524070b JS |
1437 | * |
1438 | * XXX - Do be sure to remove it once all arches implement it. | |
1439 | */ | |
52f5684c | 1440 | void __weak read_persistent_clock(struct timespec *ts) |
8524070b | 1441 | { |
d4f587c6 MS |
1442 | ts->tv_sec = 0; |
1443 | ts->tv_nsec = 0; | |
8524070b JS |
1444 | } |
1445 | ||
2ee96632 XP |
1446 | void __weak read_persistent_clock64(struct timespec64 *ts64) |
1447 | { | |
1448 | struct timespec ts; | |
1449 | ||
1450 | read_persistent_clock(&ts); | |
1451 | *ts64 = timespec_to_timespec64(ts); | |
1452 | } | |
1453 | ||
23970e38 | 1454 | /** |
e83d0a41 | 1455 | * read_boot_clock64 - Return time of the system start. |
23970e38 MS |
1456 | * |
1457 | * Weak dummy function for arches that do not yet support it. | |
1458 | * Function to read the exact time the system has been started. | |
e83d0a41 | 1459 | * Returns a timespec64 with tv_sec=0 and tv_nsec=0 if unsupported. |
23970e38 MS |
1460 | * |
1461 | * XXX - Do be sure to remove it once all arches implement it. | |
1462 | */ | |
e83d0a41 | 1463 | void __weak read_boot_clock64(struct timespec64 *ts) |
23970e38 MS |
1464 | { |
1465 | ts->tv_sec = 0; | |
1466 | ts->tv_nsec = 0; | |
1467 | } | |
1468 | ||
0fa88cb4 XP |
1469 | /* Flag for if timekeeping_resume() has injected sleeptime */ |
1470 | static bool sleeptime_injected; | |
1471 | ||
1472 | /* Flag for if there is a persistent clock on this platform */ | |
1473 | static bool persistent_clock_exists; | |
1474 | ||
8524070b JS |
1475 | /* |
1476 | * timekeeping_init - Initializes the clocksource and common timekeeping values | |
1477 | */ | |
1478 | void __init timekeeping_init(void) | |
1479 | { | |
3fdb14fd | 1480 | struct timekeeper *tk = &tk_core.timekeeper; |
155ec602 | 1481 | struct clocksource *clock; |
8524070b | 1482 | unsigned long flags; |
7d489d15 | 1483 | struct timespec64 now, boot, tmp; |
31ade306 | 1484 | |
2ee96632 | 1485 | read_persistent_clock64(&now); |
7d489d15 | 1486 | if (!timespec64_valid_strict(&now)) { |
4e8b1452 JS |
1487 | pr_warn("WARNING: Persistent clock returned invalid value!\n" |
1488 | " Check your CMOS/BIOS settings.\n"); | |
1489 | now.tv_sec = 0; | |
1490 | now.tv_nsec = 0; | |
31ade306 | 1491 | } else if (now.tv_sec || now.tv_nsec) |
0fa88cb4 | 1492 | persistent_clock_exists = true; |
4e8b1452 | 1493 | |
9a806ddb | 1494 | read_boot_clock64(&boot); |
7d489d15 | 1495 | if (!timespec64_valid_strict(&boot)) { |
4e8b1452 JS |
1496 | pr_warn("WARNING: Boot clock returned invalid value!\n" |
1497 | " Check your CMOS/BIOS settings.\n"); | |
1498 | boot.tv_sec = 0; | |
1499 | boot.tv_nsec = 0; | |
1500 | } | |
8524070b | 1501 | |
9a7a71b1 | 1502 | raw_spin_lock_irqsave(&timekeeper_lock, flags); |
3fdb14fd | 1503 | write_seqcount_begin(&tk_core.seq); |
06c017fd JS |
1504 | ntp_init(); |
1505 | ||
f1b82746 | 1506 | clock = clocksource_default_clock(); |
a0f7d48b MS |
1507 | if (clock->enable) |
1508 | clock->enable(clock); | |
4e250fdd | 1509 | tk_setup_internals(tk, clock); |
8524070b | 1510 | |
4e250fdd JS |
1511 | tk_set_xtime(tk, &now); |
1512 | tk->raw_time.tv_sec = 0; | |
1513 | tk->raw_time.tv_nsec = 0; | |
1e75fa8b | 1514 | if (boot.tv_sec == 0 && boot.tv_nsec == 0) |
4e250fdd | 1515 | boot = tk_xtime(tk); |
1e75fa8b | 1516 | |
7d489d15 | 1517 | set_normalized_timespec64(&tmp, -boot.tv_sec, -boot.tv_nsec); |
4e250fdd | 1518 | tk_set_wall_to_mono(tk, tmp); |
6d0ef903 | 1519 | |
56fd16ca | 1520 | timekeeping_update(tk, TK_MIRROR | TK_CLOCK_WAS_SET); |
48cdc135 | 1521 | |
3fdb14fd | 1522 | write_seqcount_end(&tk_core.seq); |
9a7a71b1 | 1523 | raw_spin_unlock_irqrestore(&timekeeper_lock, flags); |
8524070b JS |
1524 | } |
1525 | ||
264bb3f7 | 1526 | /* time in seconds when suspend began for persistent clock */ |
7d489d15 | 1527 | static struct timespec64 timekeeping_suspend_time; |
8524070b | 1528 | |
304529b1 JS |
1529 | /** |
1530 | * __timekeeping_inject_sleeptime - Internal function to add sleep interval | |
1531 | * @delta: pointer to a timespec delta value | |
1532 | * | |
1533 | * Takes a timespec offset measuring a suspend interval and properly | |
1534 | * adds the sleep offset to the timekeeping variables. | |
1535 | */ | |
f726a697 | 1536 | static void __timekeeping_inject_sleeptime(struct timekeeper *tk, |
7d489d15 | 1537 | struct timespec64 *delta) |
304529b1 | 1538 | { |
7d489d15 | 1539 | if (!timespec64_valid_strict(delta)) { |
6d9bcb62 JS |
1540 | printk_deferred(KERN_WARNING |
1541 | "__timekeeping_inject_sleeptime: Invalid " | |
1542 | "sleep delta value!\n"); | |
cb5de2f8 JS |
1543 | return; |
1544 | } | |
f726a697 | 1545 | tk_xtime_add(tk, delta); |
7d489d15 | 1546 | tk_set_wall_to_mono(tk, timespec64_sub(tk->wall_to_monotonic, *delta)); |
47da70d3 | 1547 | tk_update_sleep_time(tk, timespec64_to_ktime(*delta)); |
5c83545f | 1548 | tk_debug_account_sleep_time(delta); |
304529b1 JS |
1549 | } |
1550 | ||
7f298139 | 1551 | #if defined(CONFIG_PM_SLEEP) && defined(CONFIG_RTC_HCTOSYS_DEVICE) |
0fa88cb4 XP |
1552 | /** |
1553 | * We have three kinds of time sources to use for sleep time | |
1554 | * injection, the preference order is: | |
1555 | * 1) non-stop clocksource | |
1556 | * 2) persistent clock (ie: RTC accessible when irqs are off) | |
1557 | * 3) RTC | |
1558 | * | |
1559 | * 1) and 2) are used by timekeeping, 3) by RTC subsystem. | |
1560 | * If system has neither 1) nor 2), 3) will be used finally. | |
1561 | * | |
1562 | * | |
1563 | * If timekeeping has injected sleeptime via either 1) or 2), | |
1564 | * 3) becomes needless, so in this case we don't need to call | |
1565 | * rtc_resume(), and this is what timekeeping_rtc_skipresume() | |
1566 | * means. | |
1567 | */ | |
1568 | bool timekeeping_rtc_skipresume(void) | |
1569 | { | |
1570 | return sleeptime_injected; | |
1571 | } | |
1572 | ||
1573 | /** | |
1574 | * 1) can be determined whether to use or not only when doing | |
1575 | * timekeeping_resume() which is invoked after rtc_suspend(), | |
1576 | * so we can't skip rtc_suspend() surely if system has 1). | |
1577 | * | |
1578 | * But if system has 2), 2) will definitely be used, so in this | |
1579 | * case we don't need to call rtc_suspend(), and this is what | |
1580 | * timekeeping_rtc_skipsuspend() means. | |
1581 | */ | |
1582 | bool timekeeping_rtc_skipsuspend(void) | |
1583 | { | |
1584 | return persistent_clock_exists; | |
1585 | } | |
1586 | ||
304529b1 | 1587 | /** |
04d90890 | 1588 | * timekeeping_inject_sleeptime64 - Adds suspend interval to timeekeeping values |
1589 | * @delta: pointer to a timespec64 delta value | |
304529b1 | 1590 | * |
2ee96632 | 1591 | * This hook is for architectures that cannot support read_persistent_clock64 |
304529b1 | 1592 | * because their RTC/persistent clock is only accessible when irqs are enabled. |
0fa88cb4 | 1593 | * and also don't have an effective nonstop clocksource. |
304529b1 JS |
1594 | * |
1595 | * This function should only be called by rtc_resume(), and allows | |
1596 | * a suspend offset to be injected into the timekeeping values. | |
1597 | */ | |
04d90890 | 1598 | void timekeeping_inject_sleeptime64(struct timespec64 *delta) |
304529b1 | 1599 | { |
3fdb14fd | 1600 | struct timekeeper *tk = &tk_core.timekeeper; |
92c1d3ed | 1601 | unsigned long flags; |
304529b1 | 1602 | |
9a7a71b1 | 1603 | raw_spin_lock_irqsave(&timekeeper_lock, flags); |
3fdb14fd | 1604 | write_seqcount_begin(&tk_core.seq); |
70471f2f | 1605 | |
4e250fdd | 1606 | timekeeping_forward_now(tk); |
304529b1 | 1607 | |
04d90890 | 1608 | __timekeeping_inject_sleeptime(tk, delta); |
304529b1 | 1609 | |
780427f0 | 1610 | timekeeping_update(tk, TK_CLEAR_NTP | TK_MIRROR | TK_CLOCK_WAS_SET); |
304529b1 | 1611 | |
3fdb14fd | 1612 | write_seqcount_end(&tk_core.seq); |
9a7a71b1 | 1613 | raw_spin_unlock_irqrestore(&timekeeper_lock, flags); |
304529b1 JS |
1614 | |
1615 | /* signal hrtimers about time change */ | |
1616 | clock_was_set(); | |
1617 | } | |
7f298139 | 1618 | #endif |
304529b1 | 1619 | |
8524070b JS |
1620 | /** |
1621 | * timekeeping_resume - Resumes the generic timekeeping subsystem. | |
8524070b | 1622 | */ |
124cf911 | 1623 | void timekeeping_resume(void) |
8524070b | 1624 | { |
3fdb14fd | 1625 | struct timekeeper *tk = &tk_core.timekeeper; |
876e7881 | 1626 | struct clocksource *clock = tk->tkr_mono.clock; |
92c1d3ed | 1627 | unsigned long flags; |
7d489d15 | 1628 | struct timespec64 ts_new, ts_delta; |
a5a1d1c2 | 1629 | u64 cycle_now; |
d4f587c6 | 1630 | |
0fa88cb4 | 1631 | sleeptime_injected = false; |
2ee96632 | 1632 | read_persistent_clock64(&ts_new); |
8524070b | 1633 | |
adc78e6b | 1634 | clockevents_resume(); |
d10ff3fb TG |
1635 | clocksource_resume(); |
1636 | ||
9a7a71b1 | 1637 | raw_spin_lock_irqsave(&timekeeper_lock, flags); |
3fdb14fd | 1638 | write_seqcount_begin(&tk_core.seq); |
8524070b | 1639 | |
e445cf1c FT |
1640 | /* |
1641 | * After system resumes, we need to calculate the suspended time and | |
1642 | * compensate it for the OS time. There are 3 sources that could be | |
1643 | * used: Nonstop clocksource during suspend, persistent clock and rtc | |
1644 | * device. | |
1645 | * | |
1646 | * One specific platform may have 1 or 2 or all of them, and the | |
1647 | * preference will be: | |
1648 | * suspend-nonstop clocksource -> persistent clock -> rtc | |
1649 | * The less preferred source will only be tried if there is no better | |
1650 | * usable source. The rtc part is handled separately in rtc core code. | |
1651 | */ | |
ceea5e37 | 1652 | cycle_now = tk_clock_read(&tk->tkr_mono); |
e445cf1c | 1653 | if ((clock->flags & CLOCK_SOURCE_SUSPEND_NONSTOP) && |
876e7881 | 1654 | cycle_now > tk->tkr_mono.cycle_last) { |
c029a2be | 1655 | u64 nsec, cyc_delta; |
e445cf1c | 1656 | |
c029a2be TG |
1657 | cyc_delta = clocksource_delta(cycle_now, tk->tkr_mono.cycle_last, |
1658 | tk->tkr_mono.mask); | |
1659 | nsec = mul_u64_u32_shr(cyc_delta, clock->mult, clock->shift); | |
7d489d15 | 1660 | ts_delta = ns_to_timespec64(nsec); |
0fa88cb4 | 1661 | sleeptime_injected = true; |
7d489d15 JS |
1662 | } else if (timespec64_compare(&ts_new, &timekeeping_suspend_time) > 0) { |
1663 | ts_delta = timespec64_sub(ts_new, timekeeping_suspend_time); | |
0fa88cb4 | 1664 | sleeptime_injected = true; |
8524070b | 1665 | } |
e445cf1c | 1666 | |
0fa88cb4 | 1667 | if (sleeptime_injected) |
e445cf1c FT |
1668 | __timekeeping_inject_sleeptime(tk, &ts_delta); |
1669 | ||
1670 | /* Re-base the last cycle value */ | |
876e7881 | 1671 | tk->tkr_mono.cycle_last = cycle_now; |
4a4ad80d PZ |
1672 | tk->tkr_raw.cycle_last = cycle_now; |
1673 | ||
4e250fdd | 1674 | tk->ntp_error = 0; |
8524070b | 1675 | timekeeping_suspended = 0; |
780427f0 | 1676 | timekeeping_update(tk, TK_MIRROR | TK_CLOCK_WAS_SET); |
3fdb14fd | 1677 | write_seqcount_end(&tk_core.seq); |
9a7a71b1 | 1678 | raw_spin_unlock_irqrestore(&timekeeper_lock, flags); |
8524070b JS |
1679 | |
1680 | touch_softlockup_watchdog(); | |
1681 | ||
4ffee521 | 1682 | tick_resume(); |
b12a03ce | 1683 | hrtimers_resume(); |
8524070b JS |
1684 | } |
1685 | ||
124cf911 | 1686 | int timekeeping_suspend(void) |
8524070b | 1687 | { |
3fdb14fd | 1688 | struct timekeeper *tk = &tk_core.timekeeper; |
92c1d3ed | 1689 | unsigned long flags; |
7d489d15 JS |
1690 | struct timespec64 delta, delta_delta; |
1691 | static struct timespec64 old_delta; | |
8524070b | 1692 | |
2ee96632 | 1693 | read_persistent_clock64(&timekeeping_suspend_time); |
3be90950 | 1694 | |
0d6bd995 ZM |
1695 | /* |
1696 | * On some systems the persistent_clock can not be detected at | |
1697 | * timekeeping_init by its return value, so if we see a valid | |
1698 | * value returned, update the persistent_clock_exists flag. | |
1699 | */ | |
1700 | if (timekeeping_suspend_time.tv_sec || timekeeping_suspend_time.tv_nsec) | |
0fa88cb4 | 1701 | persistent_clock_exists = true; |
0d6bd995 | 1702 | |
9a7a71b1 | 1703 | raw_spin_lock_irqsave(&timekeeper_lock, flags); |
3fdb14fd | 1704 | write_seqcount_begin(&tk_core.seq); |
4e250fdd | 1705 | timekeeping_forward_now(tk); |
8524070b | 1706 | timekeeping_suspended = 1; |
cb33217b | 1707 | |
0fa88cb4 | 1708 | if (persistent_clock_exists) { |
cb33217b | 1709 | /* |
264bb3f7 XP |
1710 | * To avoid drift caused by repeated suspend/resumes, |
1711 | * which each can add ~1 second drift error, | |
1712 | * try to compensate so the difference in system time | |
1713 | * and persistent_clock time stays close to constant. | |
cb33217b | 1714 | */ |
264bb3f7 XP |
1715 | delta = timespec64_sub(tk_xtime(tk), timekeeping_suspend_time); |
1716 | delta_delta = timespec64_sub(delta, old_delta); | |
1717 | if (abs(delta_delta.tv_sec) >= 2) { | |
1718 | /* | |
1719 | * if delta_delta is too large, assume time correction | |
1720 | * has occurred and set old_delta to the current delta. | |
1721 | */ | |
1722 | old_delta = delta; | |
1723 | } else { | |
1724 | /* Otherwise try to adjust old_system to compensate */ | |
1725 | timekeeping_suspend_time = | |
1726 | timespec64_add(timekeeping_suspend_time, delta_delta); | |
1727 | } | |
cb33217b | 1728 | } |
330a1617 JS |
1729 | |
1730 | timekeeping_update(tk, TK_MIRROR); | |
060407ae | 1731 | halt_fast_timekeeper(tk); |
3fdb14fd | 1732 | write_seqcount_end(&tk_core.seq); |
9a7a71b1 | 1733 | raw_spin_unlock_irqrestore(&timekeeper_lock, flags); |
8524070b | 1734 | |
4ffee521 | 1735 | tick_suspend(); |
c54a42b1 | 1736 | clocksource_suspend(); |
adc78e6b | 1737 | clockevents_suspend(); |
8524070b JS |
1738 | |
1739 | return 0; | |
1740 | } | |
1741 | ||
1742 | /* sysfs resume/suspend bits for timekeeping */ | |
e1a85b2c | 1743 | static struct syscore_ops timekeeping_syscore_ops = { |
8524070b JS |
1744 | .resume = timekeeping_resume, |
1745 | .suspend = timekeeping_suspend, | |
8524070b JS |
1746 | }; |
1747 | ||
e1a85b2c | 1748 | static int __init timekeeping_init_ops(void) |
8524070b | 1749 | { |
e1a85b2c RW |
1750 | register_syscore_ops(&timekeeping_syscore_ops); |
1751 | return 0; | |
8524070b | 1752 | } |
e1a85b2c | 1753 | device_initcall(timekeeping_init_ops); |
8524070b JS |
1754 | |
1755 | /* | |
dc491596 | 1756 | * Apply a multiplier adjustment to the timekeeper |
8524070b | 1757 | */ |
dc491596 JS |
1758 | static __always_inline void timekeeping_apply_adjustment(struct timekeeper *tk, |
1759 | s64 offset, | |
1760 | bool negative, | |
1761 | int adj_scale) | |
8524070b | 1762 | { |
dc491596 JS |
1763 | s64 interval = tk->cycle_interval; |
1764 | s32 mult_adj = 1; | |
8524070b | 1765 | |
dc491596 JS |
1766 | if (negative) { |
1767 | mult_adj = -mult_adj; | |
1768 | interval = -interval; | |
1769 | offset = -offset; | |
1d17d174 | 1770 | } |
dc491596 JS |
1771 | mult_adj <<= adj_scale; |
1772 | interval <<= adj_scale; | |
1773 | offset <<= adj_scale; | |
8524070b | 1774 | |
c2bc1111 JS |
1775 | /* |
1776 | * So the following can be confusing. | |
1777 | * | |
dc491596 | 1778 | * To keep things simple, lets assume mult_adj == 1 for now. |
c2bc1111 | 1779 | * |
dc491596 | 1780 | * When mult_adj != 1, remember that the interval and offset values |
c2bc1111 JS |
1781 | * have been appropriately scaled so the math is the same. |
1782 | * | |
1783 | * The basic idea here is that we're increasing the multiplier | |
1784 | * by one, this causes the xtime_interval to be incremented by | |
1785 | * one cycle_interval. This is because: | |
1786 | * xtime_interval = cycle_interval * mult | |
1787 | * So if mult is being incremented by one: | |
1788 | * xtime_interval = cycle_interval * (mult + 1) | |
1789 | * Its the same as: | |
1790 | * xtime_interval = (cycle_interval * mult) + cycle_interval | |
1791 | * Which can be shortened to: | |
1792 | * xtime_interval += cycle_interval | |
1793 | * | |
1794 | * So offset stores the non-accumulated cycles. Thus the current | |
1795 | * time (in shifted nanoseconds) is: | |
1796 | * now = (offset * adj) + xtime_nsec | |
1797 | * Now, even though we're adjusting the clock frequency, we have | |
1798 | * to keep time consistent. In other words, we can't jump back | |
1799 | * in time, and we also want to avoid jumping forward in time. | |
1800 | * | |
1801 | * So given the same offset value, we need the time to be the same | |
1802 | * both before and after the freq adjustment. | |
1803 | * now = (offset * adj_1) + xtime_nsec_1 | |
1804 | * now = (offset * adj_2) + xtime_nsec_2 | |
1805 | * So: | |
1806 | * (offset * adj_1) + xtime_nsec_1 = | |
1807 | * (offset * adj_2) + xtime_nsec_2 | |
1808 | * And we know: | |
1809 | * adj_2 = adj_1 + 1 | |
1810 | * So: | |
1811 | * (offset * adj_1) + xtime_nsec_1 = | |
1812 | * (offset * (adj_1+1)) + xtime_nsec_2 | |
1813 | * (offset * adj_1) + xtime_nsec_1 = | |
1814 | * (offset * adj_1) + offset + xtime_nsec_2 | |
1815 | * Canceling the sides: | |
1816 | * xtime_nsec_1 = offset + xtime_nsec_2 | |
1817 | * Which gives us: | |
1818 | * xtime_nsec_2 = xtime_nsec_1 - offset | |
1819 | * Which simplfies to: | |
1820 | * xtime_nsec -= offset | |
1821 | * | |
1822 | * XXX - TODO: Doc ntp_error calculation. | |
1823 | */ | |
876e7881 | 1824 | if ((mult_adj > 0) && (tk->tkr_mono.mult + mult_adj < mult_adj)) { |
6067dc5a | 1825 | /* NTP adjustment caused clocksource mult overflow */ |
1826 | WARN_ON_ONCE(1); | |
1827 | return; | |
1828 | } | |
1829 | ||
876e7881 | 1830 | tk->tkr_mono.mult += mult_adj; |
f726a697 | 1831 | tk->xtime_interval += interval; |
876e7881 | 1832 | tk->tkr_mono.xtime_nsec -= offset; |
f726a697 | 1833 | tk->ntp_error -= (interval - offset) << tk->ntp_error_shift; |
dc491596 JS |
1834 | } |
1835 | ||
1836 | /* | |
1837 | * Calculate the multiplier adjustment needed to match the frequency | |
1838 | * specified by NTP | |
1839 | */ | |
1840 | static __always_inline void timekeeping_freqadjust(struct timekeeper *tk, | |
1841 | s64 offset) | |
1842 | { | |
1843 | s64 interval = tk->cycle_interval; | |
1844 | s64 xinterval = tk->xtime_interval; | |
ec02b076 JS |
1845 | u32 base = tk->tkr_mono.clock->mult; |
1846 | u32 max = tk->tkr_mono.clock->maxadj; | |
1847 | u32 cur_adj = tk->tkr_mono.mult; | |
dc491596 JS |
1848 | s64 tick_error; |
1849 | bool negative; | |
ec02b076 | 1850 | u32 adj_scale; |
dc491596 JS |
1851 | |
1852 | /* Remove any current error adj from freq calculation */ | |
1853 | if (tk->ntp_err_mult) | |
1854 | xinterval -= tk->cycle_interval; | |
1855 | ||
375f45b5 JS |
1856 | tk->ntp_tick = ntp_tick_length(); |
1857 | ||
dc491596 JS |
1858 | /* Calculate current error per tick */ |
1859 | tick_error = ntp_tick_length() >> tk->ntp_error_shift; | |
1860 | tick_error -= (xinterval + tk->xtime_remainder); | |
1861 | ||
1862 | /* Don't worry about correcting it if its small */ | |
1863 | if (likely((tick_error >= 0) && (tick_error <= interval))) | |
1864 | return; | |
1865 | ||
1866 | /* preserve the direction of correction */ | |
1867 | negative = (tick_error < 0); | |
1868 | ||
ec02b076 JS |
1869 | /* If any adjustment would pass the max, just return */ |
1870 | if (negative && (cur_adj - 1) <= (base - max)) | |
1871 | return; | |
1872 | if (!negative && (cur_adj + 1) >= (base + max)) | |
1873 | return; | |
1874 | /* | |
1875 | * Sort out the magnitude of the correction, but | |
1876 | * avoid making so large a correction that we go | |
1877 | * over the max adjustment. | |
1878 | */ | |
1879 | adj_scale = 0; | |
79211c8e | 1880 | tick_error = abs(tick_error); |
ec02b076 JS |
1881 | while (tick_error > interval) { |
1882 | u32 adj = 1 << (adj_scale + 1); | |
1883 | ||
1884 | /* Check if adjustment gets us within 1 unit from the max */ | |
1885 | if (negative && (cur_adj - adj) <= (base - max)) | |
1886 | break; | |
1887 | if (!negative && (cur_adj + adj) >= (base + max)) | |
1888 | break; | |
1889 | ||
1890 | adj_scale++; | |
dc491596 | 1891 | tick_error >>= 1; |
ec02b076 | 1892 | } |
dc491596 JS |
1893 | |
1894 | /* scale the corrections */ | |
ec02b076 | 1895 | timekeeping_apply_adjustment(tk, offset, negative, adj_scale); |
dc491596 JS |
1896 | } |
1897 | ||
1898 | /* | |
1899 | * Adjust the timekeeper's multiplier to the correct frequency | |
1900 | * and also to reduce the accumulated error value. | |
1901 | */ | |
1902 | static void timekeeping_adjust(struct timekeeper *tk, s64 offset) | |
1903 | { | |
1904 | /* Correct for the current frequency error */ | |
1905 | timekeeping_freqadjust(tk, offset); | |
1906 | ||
1907 | /* Next make a small adjustment to fix any cumulative error */ | |
1908 | if (!tk->ntp_err_mult && (tk->ntp_error > 0)) { | |
1909 | tk->ntp_err_mult = 1; | |
1910 | timekeeping_apply_adjustment(tk, offset, 0, 0); | |
1911 | } else if (tk->ntp_err_mult && (tk->ntp_error <= 0)) { | |
1912 | /* Undo any existing error adjustment */ | |
1913 | timekeeping_apply_adjustment(tk, offset, 1, 0); | |
1914 | tk->ntp_err_mult = 0; | |
1915 | } | |
1916 | ||
876e7881 PZ |
1917 | if (unlikely(tk->tkr_mono.clock->maxadj && |
1918 | (abs(tk->tkr_mono.mult - tk->tkr_mono.clock->mult) | |
1919 | > tk->tkr_mono.clock->maxadj))) { | |
dc491596 JS |
1920 | printk_once(KERN_WARNING |
1921 | "Adjusting %s more than 11%% (%ld vs %ld)\n", | |
876e7881 PZ |
1922 | tk->tkr_mono.clock->name, (long)tk->tkr_mono.mult, |
1923 | (long)tk->tkr_mono.clock->mult + tk->tkr_mono.clock->maxadj); | |
dc491596 | 1924 | } |
2a8c0883 JS |
1925 | |
1926 | /* | |
1927 | * It may be possible that when we entered this function, xtime_nsec | |
1928 | * was very small. Further, if we're slightly speeding the clocksource | |
1929 | * in the code above, its possible the required corrective factor to | |
1930 | * xtime_nsec could cause it to underflow. | |
1931 | * | |
1932 | * Now, since we already accumulated the second, cannot simply roll | |
1933 | * the accumulated second back, since the NTP subsystem has been | |
1934 | * notified via second_overflow. So instead we push xtime_nsec forward | |
1935 | * by the amount we underflowed, and add that amount into the error. | |
1936 | * | |
1937 | * We'll correct this error next time through this function, when | |
1938 | * xtime_nsec is not as small. | |
1939 | */ | |
876e7881 PZ |
1940 | if (unlikely((s64)tk->tkr_mono.xtime_nsec < 0)) { |
1941 | s64 neg = -(s64)tk->tkr_mono.xtime_nsec; | |
1942 | tk->tkr_mono.xtime_nsec = 0; | |
f726a697 | 1943 | tk->ntp_error += neg << tk->ntp_error_shift; |
2a8c0883 | 1944 | } |
8524070b JS |
1945 | } |
1946 | ||
1f4f9487 JS |
1947 | /** |
1948 | * accumulate_nsecs_to_secs - Accumulates nsecs into secs | |
1949 | * | |
571af55a | 1950 | * Helper function that accumulates the nsecs greater than a second |
1f4f9487 JS |
1951 | * from the xtime_nsec field to the xtime_secs field. |
1952 | * It also calls into the NTP code to handle leapsecond processing. | |
1953 | * | |
1954 | */ | |
780427f0 | 1955 | static inline unsigned int accumulate_nsecs_to_secs(struct timekeeper *tk) |
1f4f9487 | 1956 | { |
876e7881 | 1957 | u64 nsecps = (u64)NSEC_PER_SEC << tk->tkr_mono.shift; |
5258d3f2 | 1958 | unsigned int clock_set = 0; |
1f4f9487 | 1959 | |
876e7881 | 1960 | while (tk->tkr_mono.xtime_nsec >= nsecps) { |
1f4f9487 JS |
1961 | int leap; |
1962 | ||
876e7881 | 1963 | tk->tkr_mono.xtime_nsec -= nsecps; |
1f4f9487 JS |
1964 | tk->xtime_sec++; |
1965 | ||
1966 | /* Figure out if its a leap sec and apply if needed */ | |
1967 | leap = second_overflow(tk->xtime_sec); | |
6d0ef903 | 1968 | if (unlikely(leap)) { |
7d489d15 | 1969 | struct timespec64 ts; |
6d0ef903 JS |
1970 | |
1971 | tk->xtime_sec += leap; | |
1f4f9487 | 1972 | |
6d0ef903 JS |
1973 | ts.tv_sec = leap; |
1974 | ts.tv_nsec = 0; | |
1975 | tk_set_wall_to_mono(tk, | |
7d489d15 | 1976 | timespec64_sub(tk->wall_to_monotonic, ts)); |
6d0ef903 | 1977 | |
cc244dda JS |
1978 | __timekeeping_set_tai_offset(tk, tk->tai_offset - leap); |
1979 | ||
5258d3f2 | 1980 | clock_set = TK_CLOCK_WAS_SET; |
6d0ef903 | 1981 | } |
1f4f9487 | 1982 | } |
5258d3f2 | 1983 | return clock_set; |
1f4f9487 JS |
1984 | } |
1985 | ||
a092ff0f JS |
1986 | /** |
1987 | * logarithmic_accumulation - shifted accumulation of cycles | |
1988 | * | |
1989 | * This functions accumulates a shifted interval of cycles into | |
1990 | * into a shifted interval nanoseconds. Allows for O(log) accumulation | |
1991 | * loop. | |
1992 | * | |
1993 | * Returns the unconsumed cycles. | |
1994 | */ | |
a5a1d1c2 TG |
1995 | static u64 logarithmic_accumulation(struct timekeeper *tk, u64 offset, |
1996 | u32 shift, unsigned int *clock_set) | |
a092ff0f | 1997 | { |
a5a1d1c2 | 1998 | u64 interval = tk->cycle_interval << shift; |
3d88d56c | 1999 | u64 snsec_per_sec; |
a092ff0f | 2000 | |
571af55a | 2001 | /* If the offset is smaller than a shifted interval, do nothing */ |
23a9537a | 2002 | if (offset < interval) |
a092ff0f JS |
2003 | return offset; |
2004 | ||
2005 | /* Accumulate one shifted interval */ | |
23a9537a | 2006 | offset -= interval; |
876e7881 | 2007 | tk->tkr_mono.cycle_last += interval; |
4a4ad80d | 2008 | tk->tkr_raw.cycle_last += interval; |
a092ff0f | 2009 | |
876e7881 | 2010 | tk->tkr_mono.xtime_nsec += tk->xtime_interval << shift; |
5258d3f2 | 2011 | *clock_set |= accumulate_nsecs_to_secs(tk); |
a092ff0f | 2012 | |
deda2e81 | 2013 | /* Accumulate raw time */ |
3d88d56c JS |
2014 | tk->tkr_raw.xtime_nsec += (u64)tk->raw_time.tv_nsec << tk->tkr_raw.shift; |
2015 | tk->tkr_raw.xtime_nsec += tk->raw_interval << shift; | |
2016 | snsec_per_sec = (u64)NSEC_PER_SEC << tk->tkr_raw.shift; | |
2017 | while (tk->tkr_raw.xtime_nsec >= snsec_per_sec) { | |
2018 | tk->tkr_raw.xtime_nsec -= snsec_per_sec; | |
2019 | tk->raw_time.tv_sec++; | |
a092ff0f | 2020 | } |
3d88d56c JS |
2021 | tk->raw_time.tv_nsec = tk->tkr_raw.xtime_nsec >> tk->tkr_raw.shift; |
2022 | tk->tkr_raw.xtime_nsec -= (u64)tk->raw_time.tv_nsec << tk->tkr_raw.shift; | |
a092ff0f JS |
2023 | |
2024 | /* Accumulate error between NTP and clock interval */ | |
375f45b5 | 2025 | tk->ntp_error += tk->ntp_tick << shift; |
f726a697 JS |
2026 | tk->ntp_error -= (tk->xtime_interval + tk->xtime_remainder) << |
2027 | (tk->ntp_error_shift + shift); | |
a092ff0f JS |
2028 | |
2029 | return offset; | |
2030 | } | |
2031 | ||
8524070b JS |
2032 | /** |
2033 | * update_wall_time - Uses the current clocksource to increment the wall time | |
2034 | * | |
8524070b | 2035 | */ |
47a1b796 | 2036 | void update_wall_time(void) |
8524070b | 2037 | { |
3fdb14fd | 2038 | struct timekeeper *real_tk = &tk_core.timekeeper; |
48cdc135 | 2039 | struct timekeeper *tk = &shadow_timekeeper; |
a5a1d1c2 | 2040 | u64 offset; |
a092ff0f | 2041 | int shift = 0, maxshift; |
5258d3f2 | 2042 | unsigned int clock_set = 0; |
70471f2f JS |
2043 | unsigned long flags; |
2044 | ||
9a7a71b1 | 2045 | raw_spin_lock_irqsave(&timekeeper_lock, flags); |
8524070b JS |
2046 | |
2047 | /* Make sure we're fully resumed: */ | |
2048 | if (unlikely(timekeeping_suspended)) | |
70471f2f | 2049 | goto out; |
8524070b | 2050 | |
592913ec | 2051 | #ifdef CONFIG_ARCH_USES_GETTIMEOFFSET |
48cdc135 | 2052 | offset = real_tk->cycle_interval; |
592913ec | 2053 | #else |
ceea5e37 | 2054 | offset = clocksource_delta(tk_clock_read(&tk->tkr_mono), |
876e7881 | 2055 | tk->tkr_mono.cycle_last, tk->tkr_mono.mask); |
8524070b | 2056 | #endif |
8524070b | 2057 | |
bf2ac312 | 2058 | /* Check if there's really nothing to do */ |
48cdc135 | 2059 | if (offset < real_tk->cycle_interval) |
bf2ac312 JS |
2060 | goto out; |
2061 | ||
3c17ad19 JS |
2062 | /* Do some additional sanity checking */ |
2063 | timekeeping_check_update(real_tk, offset); | |
2064 | ||
a092ff0f JS |
2065 | /* |
2066 | * With NO_HZ we may have to accumulate many cycle_intervals | |
2067 | * (think "ticks") worth of time at once. To do this efficiently, | |
2068 | * we calculate the largest doubling multiple of cycle_intervals | |
88b28adf | 2069 | * that is smaller than the offset. We then accumulate that |
a092ff0f JS |
2070 | * chunk in one go, and then try to consume the next smaller |
2071 | * doubled multiple. | |
8524070b | 2072 | */ |
4e250fdd | 2073 | shift = ilog2(offset) - ilog2(tk->cycle_interval); |
a092ff0f | 2074 | shift = max(0, shift); |
88b28adf | 2075 | /* Bound shift to one less than what overflows tick_length */ |
ea7cf49a | 2076 | maxshift = (64 - (ilog2(ntp_tick_length())+1)) - 1; |
a092ff0f | 2077 | shift = min(shift, maxshift); |
4e250fdd | 2078 | while (offset >= tk->cycle_interval) { |
5258d3f2 JS |
2079 | offset = logarithmic_accumulation(tk, offset, shift, |
2080 | &clock_set); | |
4e250fdd | 2081 | if (offset < tk->cycle_interval<<shift) |
830ec045 | 2082 | shift--; |
8524070b JS |
2083 | } |
2084 | ||
2085 | /* correct the clock when NTP error is too big */ | |
4e250fdd | 2086 | timekeeping_adjust(tk, offset); |
8524070b | 2087 | |
6a867a39 | 2088 | /* |
92bb1fcf JS |
2089 | * XXX This can be killed once everyone converts |
2090 | * to the new update_vsyscall. | |
2091 | */ | |
2092 | old_vsyscall_fixup(tk); | |
8524070b | 2093 | |
6a867a39 JS |
2094 | /* |
2095 | * Finally, make sure that after the rounding | |
1e75fa8b | 2096 | * xtime_nsec isn't larger than NSEC_PER_SEC |
6a867a39 | 2097 | */ |
5258d3f2 | 2098 | clock_set |= accumulate_nsecs_to_secs(tk); |
83f57a11 | 2099 | |
3fdb14fd | 2100 | write_seqcount_begin(&tk_core.seq); |
48cdc135 TG |
2101 | /* |
2102 | * Update the real timekeeper. | |
2103 | * | |
2104 | * We could avoid this memcpy by switching pointers, but that | |
2105 | * requires changes to all other timekeeper usage sites as | |
2106 | * well, i.e. move the timekeeper pointer getter into the | |
2107 | * spinlocked/seqcount protected sections. And we trade this | |
3fdb14fd | 2108 | * memcpy under the tk_core.seq against one before we start |
48cdc135 TG |
2109 | * updating. |
2110 | */ | |
906c5557 | 2111 | timekeeping_update(tk, clock_set); |
48cdc135 | 2112 | memcpy(real_tk, tk, sizeof(*tk)); |
906c5557 | 2113 | /* The memcpy must come last. Do not put anything here! */ |
3fdb14fd | 2114 | write_seqcount_end(&tk_core.seq); |
ca4523cd | 2115 | out: |
9a7a71b1 | 2116 | raw_spin_unlock_irqrestore(&timekeeper_lock, flags); |
47a1b796 | 2117 | if (clock_set) |
cab5e127 JS |
2118 | /* Have to call _delayed version, since in irq context*/ |
2119 | clock_was_set_delayed(); | |
8524070b | 2120 | } |
7c3f1a57 TJ |
2121 | |
2122 | /** | |
d08c0cdd JS |
2123 | * getboottime64 - Return the real time of system boot. |
2124 | * @ts: pointer to the timespec64 to be set | |
7c3f1a57 | 2125 | * |
d08c0cdd | 2126 | * Returns the wall-time of boot in a timespec64. |
7c3f1a57 TJ |
2127 | * |
2128 | * This is based on the wall_to_monotonic offset and the total suspend | |
2129 | * time. Calls to settimeofday will affect the value returned (which | |
2130 | * basically means that however wrong your real time clock is at boot time, | |
2131 | * you get the right time here). | |
2132 | */ | |
d08c0cdd | 2133 | void getboottime64(struct timespec64 *ts) |
7c3f1a57 | 2134 | { |
3fdb14fd | 2135 | struct timekeeper *tk = &tk_core.timekeeper; |
02cba159 TG |
2136 | ktime_t t = ktime_sub(tk->offs_real, tk->offs_boot); |
2137 | ||
d08c0cdd | 2138 | *ts = ktime_to_timespec64(t); |
7c3f1a57 | 2139 | } |
d08c0cdd | 2140 | EXPORT_SYMBOL_GPL(getboottime64); |
7c3f1a57 | 2141 | |
17c38b74 JS |
2142 | unsigned long get_seconds(void) |
2143 | { | |
3fdb14fd | 2144 | struct timekeeper *tk = &tk_core.timekeeper; |
4e250fdd JS |
2145 | |
2146 | return tk->xtime_sec; | |
17c38b74 JS |
2147 | } |
2148 | EXPORT_SYMBOL(get_seconds); | |
2149 | ||
da15cfda JS |
2150 | struct timespec __current_kernel_time(void) |
2151 | { | |
3fdb14fd | 2152 | struct timekeeper *tk = &tk_core.timekeeper; |
4e250fdd | 2153 | |
7d489d15 | 2154 | return timespec64_to_timespec(tk_xtime(tk)); |
da15cfda | 2155 | } |
17c38b74 | 2156 | |
8758a240 | 2157 | struct timespec64 current_kernel_time64(void) |
2c6b47de | 2158 | { |
3fdb14fd | 2159 | struct timekeeper *tk = &tk_core.timekeeper; |
7d489d15 | 2160 | struct timespec64 now; |
2c6b47de JS |
2161 | unsigned long seq; |
2162 | ||
2163 | do { | |
3fdb14fd | 2164 | seq = read_seqcount_begin(&tk_core.seq); |
83f57a11 | 2165 | |
4e250fdd | 2166 | now = tk_xtime(tk); |
3fdb14fd | 2167 | } while (read_seqcount_retry(&tk_core.seq, seq)); |
2c6b47de | 2168 | |
8758a240 | 2169 | return now; |
2c6b47de | 2170 | } |
8758a240 | 2171 | EXPORT_SYMBOL(current_kernel_time64); |
da15cfda | 2172 | |
334334b5 | 2173 | struct timespec64 get_monotonic_coarse64(void) |
da15cfda | 2174 | { |
3fdb14fd | 2175 | struct timekeeper *tk = &tk_core.timekeeper; |
7d489d15 | 2176 | struct timespec64 now, mono; |
da15cfda JS |
2177 | unsigned long seq; |
2178 | ||
2179 | do { | |
3fdb14fd | 2180 | seq = read_seqcount_begin(&tk_core.seq); |
83f57a11 | 2181 | |
4e250fdd JS |
2182 | now = tk_xtime(tk); |
2183 | mono = tk->wall_to_monotonic; | |
3fdb14fd | 2184 | } while (read_seqcount_retry(&tk_core.seq, seq)); |
da15cfda | 2185 | |
7d489d15 | 2186 | set_normalized_timespec64(&now, now.tv_sec + mono.tv_sec, |
da15cfda | 2187 | now.tv_nsec + mono.tv_nsec); |
7d489d15 | 2188 | |
334334b5 | 2189 | return now; |
da15cfda | 2190 | } |
eaaa7ec7 | 2191 | EXPORT_SYMBOL(get_monotonic_coarse64); |
871cf1e5 TH |
2192 | |
2193 | /* | |
d6ad4187 | 2194 | * Must hold jiffies_lock |
871cf1e5 TH |
2195 | */ |
2196 | void do_timer(unsigned long ticks) | |
2197 | { | |
2198 | jiffies_64 += ticks; | |
871cf1e5 TH |
2199 | calc_global_load(ticks); |
2200 | } | |
48cf76f7 | 2201 | |
f6c06abf | 2202 | /** |
76f41088 | 2203 | * ktime_get_update_offsets_now - hrtimer helper |
868a3e91 | 2204 | * @cwsseq: pointer to check and store the clock was set sequence number |
f6c06abf TG |
2205 | * @offs_real: pointer to storage for monotonic -> realtime offset |
2206 | * @offs_boot: pointer to storage for monotonic -> boottime offset | |
b7bc50e4 | 2207 | * @offs_tai: pointer to storage for monotonic -> clock tai offset |
f6c06abf | 2208 | * |
868a3e91 TG |
2209 | * Returns current monotonic time and updates the offsets if the |
2210 | * sequence number in @cwsseq and timekeeper.clock_was_set_seq are | |
2211 | * different. | |
2212 | * | |
b7bc50e4 | 2213 | * Called from hrtimer_interrupt() or retrigger_next_event() |
f6c06abf | 2214 | */ |
868a3e91 TG |
2215 | ktime_t ktime_get_update_offsets_now(unsigned int *cwsseq, ktime_t *offs_real, |
2216 | ktime_t *offs_boot, ktime_t *offs_tai) | |
f6c06abf | 2217 | { |
3fdb14fd | 2218 | struct timekeeper *tk = &tk_core.timekeeper; |
f6c06abf | 2219 | unsigned int seq; |
a37c0aad TG |
2220 | ktime_t base; |
2221 | u64 nsecs; | |
f6c06abf TG |
2222 | |
2223 | do { | |
3fdb14fd | 2224 | seq = read_seqcount_begin(&tk_core.seq); |
f6c06abf | 2225 | |
876e7881 PZ |
2226 | base = tk->tkr_mono.base; |
2227 | nsecs = timekeeping_get_ns(&tk->tkr_mono); | |
833f32d7 JS |
2228 | base = ktime_add_ns(base, nsecs); |
2229 | ||
868a3e91 TG |
2230 | if (*cwsseq != tk->clock_was_set_seq) { |
2231 | *cwsseq = tk->clock_was_set_seq; | |
2232 | *offs_real = tk->offs_real; | |
2233 | *offs_boot = tk->offs_boot; | |
2234 | *offs_tai = tk->offs_tai; | |
2235 | } | |
833f32d7 JS |
2236 | |
2237 | /* Handle leapsecond insertion adjustments */ | |
2456e855 | 2238 | if (unlikely(base >= tk->next_leap_ktime)) |
833f32d7 JS |
2239 | *offs_real = ktime_sub(tk->offs_real, ktime_set(1, 0)); |
2240 | ||
3fdb14fd | 2241 | } while (read_seqcount_retry(&tk_core.seq, seq)); |
f6c06abf | 2242 | |
833f32d7 | 2243 | return base; |
f6c06abf | 2244 | } |
f6c06abf | 2245 | |
aa6f9c59 JS |
2246 | /** |
2247 | * do_adjtimex() - Accessor function to NTP __do_adjtimex function | |
2248 | */ | |
2249 | int do_adjtimex(struct timex *txc) | |
2250 | { | |
3fdb14fd | 2251 | struct timekeeper *tk = &tk_core.timekeeper; |
06c017fd | 2252 | unsigned long flags; |
7d489d15 | 2253 | struct timespec64 ts; |
4e8f8b34 | 2254 | s32 orig_tai, tai; |
e4085693 JS |
2255 | int ret; |
2256 | ||
2257 | /* Validate the data before disabling interrupts */ | |
2258 | ret = ntp_validate_timex(txc); | |
2259 | if (ret) | |
2260 | return ret; | |
2261 | ||
cef90377 JS |
2262 | if (txc->modes & ADJ_SETOFFSET) { |
2263 | struct timespec delta; | |
2264 | delta.tv_sec = txc->time.tv_sec; | |
2265 | delta.tv_nsec = txc->time.tv_usec; | |
2266 | if (!(txc->modes & ADJ_NANO)) | |
2267 | delta.tv_nsec *= 1000; | |
2268 | ret = timekeeping_inject_offset(&delta); | |
2269 | if (ret) | |
2270 | return ret; | |
2271 | } | |
2272 | ||
d6d29896 | 2273 | getnstimeofday64(&ts); |
87ace39b | 2274 | |
06c017fd | 2275 | raw_spin_lock_irqsave(&timekeeper_lock, flags); |
3fdb14fd | 2276 | write_seqcount_begin(&tk_core.seq); |
06c017fd | 2277 | |
4e8f8b34 | 2278 | orig_tai = tai = tk->tai_offset; |
87ace39b | 2279 | ret = __do_adjtimex(txc, &ts, &tai); |
aa6f9c59 | 2280 | |
4e8f8b34 JS |
2281 | if (tai != orig_tai) { |
2282 | __timekeeping_set_tai_offset(tk, tai); | |
f55c0760 | 2283 | timekeeping_update(tk, TK_MIRROR | TK_CLOCK_WAS_SET); |
4e8f8b34 | 2284 | } |
833f32d7 JS |
2285 | tk_update_leap_state(tk); |
2286 | ||
3fdb14fd | 2287 | write_seqcount_end(&tk_core.seq); |
06c017fd JS |
2288 | raw_spin_unlock_irqrestore(&timekeeper_lock, flags); |
2289 | ||
6fdda9a9 JS |
2290 | if (tai != orig_tai) |
2291 | clock_was_set(); | |
2292 | ||
7bd36014 JS |
2293 | ntp_notify_cmos_timer(); |
2294 | ||
87ace39b JS |
2295 | return ret; |
2296 | } | |
aa6f9c59 JS |
2297 | |
2298 | #ifdef CONFIG_NTP_PPS | |
2299 | /** | |
2300 | * hardpps() - Accessor function to NTP __hardpps function | |
2301 | */ | |
7ec88e4b | 2302 | void hardpps(const struct timespec64 *phase_ts, const struct timespec64 *raw_ts) |
aa6f9c59 | 2303 | { |
06c017fd JS |
2304 | unsigned long flags; |
2305 | ||
2306 | raw_spin_lock_irqsave(&timekeeper_lock, flags); | |
3fdb14fd | 2307 | write_seqcount_begin(&tk_core.seq); |
06c017fd | 2308 | |
aa6f9c59 | 2309 | __hardpps(phase_ts, raw_ts); |
06c017fd | 2310 | |
3fdb14fd | 2311 | write_seqcount_end(&tk_core.seq); |
06c017fd | 2312 | raw_spin_unlock_irqrestore(&timekeeper_lock, flags); |
aa6f9c59 JS |
2313 | } |
2314 | EXPORT_SYMBOL(hardpps); | |
2315 | #endif | |
2316 | ||
f0af911a TH |
2317 | /** |
2318 | * xtime_update() - advances the timekeeping infrastructure | |
2319 | * @ticks: number of ticks, that have elapsed since the last call. | |
2320 | * | |
2321 | * Must be called with interrupts disabled. | |
2322 | */ | |
2323 | void xtime_update(unsigned long ticks) | |
2324 | { | |
d6ad4187 | 2325 | write_seqlock(&jiffies_lock); |
f0af911a | 2326 | do_timer(ticks); |
d6ad4187 | 2327 | write_sequnlock(&jiffies_lock); |
47a1b796 | 2328 | update_wall_time(); |
f0af911a | 2329 | } |