john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 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 | |
John Stultz | d7b4202 | 2012-09-04 15:12:07 -0400 | [diff] [blame] | 11 | #include <linux/timekeeper_internal.h> |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 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> |
Alexey Dobriyan | d43c36d | 2009-10-07 17:09:06 +0400 | [diff] [blame] | 17 | #include <linux/sched.h> |
Rafael J. Wysocki | e1a85b2 | 2011-03-23 22:16:04 +0100 | [diff] [blame] | 18 | #include <linux/syscore_ops.h> |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 19 | #include <linux/clocksource.h> |
| 20 | #include <linux/jiffies.h> |
| 21 | #include <linux/time.h> |
| 22 | #include <linux/tick.h> |
Martin Schwidefsky | 75c5158 | 2009-08-14 15:47:30 +0200 | [diff] [blame] | 23 | #include <linux/stop_machine.h> |
Marcelo Tosatti | e0b306f | 2012-11-27 23:28:59 -0200 | [diff] [blame] | 24 | #include <linux/pvclock_gtod.h> |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 25 | |
Thomas Gleixner | eb93e4d | 2013-02-21 22:51:36 +0000 | [diff] [blame] | 26 | #include "tick-internal.h" |
John Stultz | aa6f9c59 | 2013-03-22 11:31:29 -0700 | [diff] [blame] | 27 | #include "ntp_internal.h" |
Martin Schwidefsky | 155ec60 | 2009-08-14 15:47:26 +0200 | [diff] [blame] | 28 | |
H Hartley Sweeten | afa14e7 | 2011-01-11 17:59:38 -0600 | [diff] [blame] | 29 | static struct timekeeper timekeeper; |
Thomas Gleixner | 9a7a71b | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 30 | static DEFINE_RAW_SPINLOCK(timekeeper_lock); |
| 31 | static seqcount_t timekeeper_seq; |
Thomas Gleixner | 48cdc13 | 2013-02-21 22:51:40 +0000 | [diff] [blame] | 32 | static struct timekeeper shadow_timekeeper; |
Martin Schwidefsky | 155ec60 | 2009-08-14 15:47:26 +0200 | [diff] [blame] | 33 | |
John Stultz | 8fcce54 | 2011-11-14 11:46:39 -0800 | [diff] [blame] | 34 | /* flag for if timekeeping is suspended */ |
| 35 | int __read_mostly timekeeping_suspended; |
| 36 | |
Feng Tang | 31ade30 | 2013-01-16 00:09:47 +0800 | [diff] [blame] | 37 | /* Flag for if there is a persistent clock on this platform */ |
| 38 | bool __read_mostly persistent_clock_exist = false; |
| 39 | |
John Stultz | 1e75fa8 | 2012-07-13 01:21:53 -0400 | [diff] [blame] | 40 | static inline void tk_normalize_xtime(struct timekeeper *tk) |
| 41 | { |
| 42 | while (tk->xtime_nsec >= ((u64)NSEC_PER_SEC << tk->shift)) { |
| 43 | tk->xtime_nsec -= (u64)NSEC_PER_SEC << tk->shift; |
| 44 | tk->xtime_sec++; |
| 45 | } |
| 46 | } |
John Stultz | 8fcce54 | 2011-11-14 11:46:39 -0800 | [diff] [blame] | 47 | |
John Stultz | 1e75fa8 | 2012-07-13 01:21:53 -0400 | [diff] [blame] | 48 | static void tk_set_xtime(struct timekeeper *tk, const struct timespec *ts) |
| 49 | { |
| 50 | tk->xtime_sec = ts->tv_sec; |
John Stultz | b44d50d | 2012-07-23 16:22:37 -0400 | [diff] [blame] | 51 | tk->xtime_nsec = (u64)ts->tv_nsec << tk->shift; |
John Stultz | 1e75fa8 | 2012-07-13 01:21:53 -0400 | [diff] [blame] | 52 | } |
| 53 | |
| 54 | static void tk_xtime_add(struct timekeeper *tk, const struct timespec *ts) |
| 55 | { |
| 56 | tk->xtime_sec += ts->tv_sec; |
John Stultz | b44d50d | 2012-07-23 16:22:37 -0400 | [diff] [blame] | 57 | tk->xtime_nsec += (u64)ts->tv_nsec << tk->shift; |
John Stultz | 784ffcb | 2012-08-21 20:30:46 -0400 | [diff] [blame] | 58 | tk_normalize_xtime(tk); |
John Stultz | 1e75fa8 | 2012-07-13 01:21:53 -0400 | [diff] [blame] | 59 | } |
John Stultz | 8fcce54 | 2011-11-14 11:46:39 -0800 | [diff] [blame] | 60 | |
John Stultz | 6d0ef90 | 2012-07-27 14:48:12 -0400 | [diff] [blame] | 61 | static void tk_set_wall_to_mono(struct timekeeper *tk, struct timespec wtm) |
| 62 | { |
| 63 | struct timespec tmp; |
| 64 | |
| 65 | /* |
| 66 | * Verify consistency of: offset_real = -wall_to_monotonic |
| 67 | * before modifying anything |
| 68 | */ |
| 69 | set_normalized_timespec(&tmp, -tk->wall_to_monotonic.tv_sec, |
| 70 | -tk->wall_to_monotonic.tv_nsec); |
| 71 | WARN_ON_ONCE(tk->offs_real.tv64 != timespec_to_ktime(tmp).tv64); |
| 72 | tk->wall_to_monotonic = wtm; |
| 73 | set_normalized_timespec(&tmp, -wtm.tv_sec, -wtm.tv_nsec); |
| 74 | tk->offs_real = timespec_to_ktime(tmp); |
John Stultz | 90adda9 | 2013-01-21 17:00:11 -0800 | [diff] [blame] | 75 | tk->offs_tai = ktime_sub(tk->offs_real, ktime_set(tk->tai_offset, 0)); |
John Stultz | 6d0ef90 | 2012-07-27 14:48:12 -0400 | [diff] [blame] | 76 | } |
| 77 | |
| 78 | static void tk_set_sleep_time(struct timekeeper *tk, struct timespec t) |
| 79 | { |
| 80 | /* Verify consistency before modifying */ |
| 81 | WARN_ON_ONCE(tk->offs_boot.tv64 != timespec_to_ktime(tk->total_sleep_time).tv64); |
| 82 | |
| 83 | tk->total_sleep_time = t; |
| 84 | tk->offs_boot = timespec_to_ktime(t); |
| 85 | } |
| 86 | |
Martin Schwidefsky | 155ec60 | 2009-08-14 15:47:26 +0200 | [diff] [blame] | 87 | /** |
| 88 | * timekeeper_setup_internals - Set up internals to use clocksource clock. |
| 89 | * |
| 90 | * @clock: Pointer to clocksource. |
| 91 | * |
| 92 | * Calculates a fixed cycle/nsec interval for a given clocksource/adjustment |
| 93 | * pair and interval request. |
| 94 | * |
| 95 | * Unless you're the timekeeping code, you should not be using this! |
| 96 | */ |
John Stultz | f726a69 | 2012-07-13 01:21:57 -0400 | [diff] [blame] | 97 | static void tk_setup_internals(struct timekeeper *tk, struct clocksource *clock) |
Martin Schwidefsky | 155ec60 | 2009-08-14 15:47:26 +0200 | [diff] [blame] | 98 | { |
| 99 | cycle_t interval; |
Kasper Pedersen | a386b5a | 2010-10-20 15:55:15 -0700 | [diff] [blame] | 100 | u64 tmp, ntpinterval; |
John Stultz | 1e75fa8 | 2012-07-13 01:21:53 -0400 | [diff] [blame] | 101 | struct clocksource *old_clock; |
Martin Schwidefsky | 155ec60 | 2009-08-14 15:47:26 +0200 | [diff] [blame] | 102 | |
John Stultz | f726a69 | 2012-07-13 01:21:57 -0400 | [diff] [blame] | 103 | old_clock = tk->clock; |
| 104 | tk->clock = clock; |
Thomas Gleixner | 14a3b6a | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 105 | tk->cycle_last = clock->cycle_last = clock->read(clock); |
Martin Schwidefsky | 155ec60 | 2009-08-14 15:47:26 +0200 | [diff] [blame] | 106 | |
| 107 | /* Do the ns -> cycle conversion first, using original mult */ |
| 108 | tmp = NTP_INTERVAL_LENGTH; |
| 109 | tmp <<= clock->shift; |
Kasper Pedersen | a386b5a | 2010-10-20 15:55:15 -0700 | [diff] [blame] | 110 | ntpinterval = tmp; |
Martin Schwidefsky | 0a54419 | 2009-08-14 15:47:28 +0200 | [diff] [blame] | 111 | tmp += clock->mult/2; |
| 112 | do_div(tmp, clock->mult); |
Martin Schwidefsky | 155ec60 | 2009-08-14 15:47:26 +0200 | [diff] [blame] | 113 | if (tmp == 0) |
| 114 | tmp = 1; |
| 115 | |
| 116 | interval = (cycle_t) tmp; |
John Stultz | f726a69 | 2012-07-13 01:21:57 -0400 | [diff] [blame] | 117 | tk->cycle_interval = interval; |
Martin Schwidefsky | 155ec60 | 2009-08-14 15:47:26 +0200 | [diff] [blame] | 118 | |
| 119 | /* Go back from cycles -> shifted ns */ |
John Stultz | f726a69 | 2012-07-13 01:21:57 -0400 | [diff] [blame] | 120 | tk->xtime_interval = (u64) interval * clock->mult; |
| 121 | tk->xtime_remainder = ntpinterval - tk->xtime_interval; |
| 122 | tk->raw_interval = |
Martin Schwidefsky | 0a54419 | 2009-08-14 15:47:28 +0200 | [diff] [blame] | 123 | ((u64) interval * clock->mult) >> clock->shift; |
Martin Schwidefsky | 155ec60 | 2009-08-14 15:47:26 +0200 | [diff] [blame] | 124 | |
John Stultz | 1e75fa8 | 2012-07-13 01:21:53 -0400 | [diff] [blame] | 125 | /* if changing clocks, convert xtime_nsec shift units */ |
| 126 | if (old_clock) { |
| 127 | int shift_change = clock->shift - old_clock->shift; |
| 128 | if (shift_change < 0) |
John Stultz | f726a69 | 2012-07-13 01:21:57 -0400 | [diff] [blame] | 129 | tk->xtime_nsec >>= -shift_change; |
John Stultz | 1e75fa8 | 2012-07-13 01:21:53 -0400 | [diff] [blame] | 130 | else |
John Stultz | f726a69 | 2012-07-13 01:21:57 -0400 | [diff] [blame] | 131 | tk->xtime_nsec <<= shift_change; |
John Stultz | 1e75fa8 | 2012-07-13 01:21:53 -0400 | [diff] [blame] | 132 | } |
John Stultz | f726a69 | 2012-07-13 01:21:57 -0400 | [diff] [blame] | 133 | tk->shift = clock->shift; |
Martin Schwidefsky | 155ec60 | 2009-08-14 15:47:26 +0200 | [diff] [blame] | 134 | |
John Stultz | f726a69 | 2012-07-13 01:21:57 -0400 | [diff] [blame] | 135 | tk->ntp_error = 0; |
| 136 | tk->ntp_error_shift = NTP_SCALE_SHIFT - clock->shift; |
Martin Schwidefsky | 0a54419 | 2009-08-14 15:47:28 +0200 | [diff] [blame] | 137 | |
| 138 | /* |
| 139 | * The timekeeper keeps its own mult values for the currently |
| 140 | * active clocksource. These value will be adjusted via NTP |
| 141 | * to counteract clock drifting. |
| 142 | */ |
John Stultz | f726a69 | 2012-07-13 01:21:57 -0400 | [diff] [blame] | 143 | tk->mult = clock->mult; |
Martin Schwidefsky | 155ec60 | 2009-08-14 15:47:26 +0200 | [diff] [blame] | 144 | } |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 145 | |
Martin Schwidefsky | 2ba2a30 | 2009-08-14 15:47:29 +0200 | [diff] [blame] | 146 | /* Timekeeper helper functions. */ |
Stephen Warren | 7b1f620 | 2012-11-07 17:58:54 -0700 | [diff] [blame] | 147 | |
| 148 | #ifdef CONFIG_ARCH_USES_GETTIMEOFFSET |
| 149 | u32 (*arch_gettimeoffset)(void); |
| 150 | |
| 151 | u32 get_arch_timeoffset(void) |
| 152 | { |
| 153 | if (likely(arch_gettimeoffset)) |
| 154 | return arch_gettimeoffset(); |
| 155 | return 0; |
| 156 | } |
| 157 | #else |
| 158 | static inline u32 get_arch_timeoffset(void) { return 0; } |
| 159 | #endif |
| 160 | |
John Stultz | f726a69 | 2012-07-13 01:21:57 -0400 | [diff] [blame] | 161 | static inline s64 timekeeping_get_ns(struct timekeeper *tk) |
Martin Schwidefsky | 2ba2a30 | 2009-08-14 15:47:29 +0200 | [diff] [blame] | 162 | { |
| 163 | cycle_t cycle_now, cycle_delta; |
| 164 | struct clocksource *clock; |
John Stultz | 1e75fa8 | 2012-07-13 01:21:53 -0400 | [diff] [blame] | 165 | s64 nsec; |
Martin Schwidefsky | 2ba2a30 | 2009-08-14 15:47:29 +0200 | [diff] [blame] | 166 | |
| 167 | /* read clocksource: */ |
John Stultz | f726a69 | 2012-07-13 01:21:57 -0400 | [diff] [blame] | 168 | clock = tk->clock; |
Martin Schwidefsky | 2ba2a30 | 2009-08-14 15:47:29 +0200 | [diff] [blame] | 169 | cycle_now = clock->read(clock); |
| 170 | |
| 171 | /* calculate the delta since the last update_wall_time: */ |
| 172 | cycle_delta = (cycle_now - clock->cycle_last) & clock->mask; |
| 173 | |
John Stultz | f726a69 | 2012-07-13 01:21:57 -0400 | [diff] [blame] | 174 | nsec = cycle_delta * tk->mult + tk->xtime_nsec; |
| 175 | nsec >>= tk->shift; |
John Stultz | f2a5a08 | 2012-07-13 01:21:55 -0400 | [diff] [blame] | 176 | |
Stephen Warren | 7b1f620 | 2012-11-07 17:58:54 -0700 | [diff] [blame] | 177 | /* If arch requires, add in get_arch_timeoffset() */ |
| 178 | return nsec + get_arch_timeoffset(); |
Martin Schwidefsky | 2ba2a30 | 2009-08-14 15:47:29 +0200 | [diff] [blame] | 179 | } |
| 180 | |
John Stultz | f726a69 | 2012-07-13 01:21:57 -0400 | [diff] [blame] | 181 | static inline s64 timekeeping_get_ns_raw(struct timekeeper *tk) |
Martin Schwidefsky | 2ba2a30 | 2009-08-14 15:47:29 +0200 | [diff] [blame] | 182 | { |
| 183 | cycle_t cycle_now, cycle_delta; |
| 184 | struct clocksource *clock; |
John Stultz | f2a5a08 | 2012-07-13 01:21:55 -0400 | [diff] [blame] | 185 | s64 nsec; |
Martin Schwidefsky | 2ba2a30 | 2009-08-14 15:47:29 +0200 | [diff] [blame] | 186 | |
| 187 | /* read clocksource: */ |
John Stultz | f726a69 | 2012-07-13 01:21:57 -0400 | [diff] [blame] | 188 | clock = tk->clock; |
Martin Schwidefsky | 2ba2a30 | 2009-08-14 15:47:29 +0200 | [diff] [blame] | 189 | cycle_now = clock->read(clock); |
| 190 | |
| 191 | /* calculate the delta since the last update_wall_time: */ |
| 192 | cycle_delta = (cycle_now - clock->cycle_last) & clock->mask; |
| 193 | |
John Stultz | f2a5a08 | 2012-07-13 01:21:55 -0400 | [diff] [blame] | 194 | /* convert delta to nanoseconds. */ |
| 195 | nsec = clocksource_cyc2ns(cycle_delta, clock->mult, clock->shift); |
| 196 | |
Stephen Warren | 7b1f620 | 2012-11-07 17:58:54 -0700 | [diff] [blame] | 197 | /* If arch requires, add in get_arch_timeoffset() */ |
| 198 | return nsec + get_arch_timeoffset(); |
Martin Schwidefsky | 2ba2a30 | 2009-08-14 15:47:29 +0200 | [diff] [blame] | 199 | } |
| 200 | |
Marcelo Tosatti | e0b306f | 2012-11-27 23:28:59 -0200 | [diff] [blame] | 201 | static RAW_NOTIFIER_HEAD(pvclock_gtod_chain); |
| 202 | |
| 203 | static void update_pvclock_gtod(struct timekeeper *tk) |
| 204 | { |
| 205 | raw_notifier_call_chain(&pvclock_gtod_chain, 0, tk); |
| 206 | } |
| 207 | |
| 208 | /** |
| 209 | * pvclock_gtod_register_notifier - register a pvclock timedata update listener |
Marcelo Tosatti | e0b306f | 2012-11-27 23:28:59 -0200 | [diff] [blame] | 210 | */ |
| 211 | int pvclock_gtod_register_notifier(struct notifier_block *nb) |
| 212 | { |
| 213 | struct timekeeper *tk = &timekeeper; |
| 214 | unsigned long flags; |
| 215 | int ret; |
| 216 | |
Thomas Gleixner | 9a7a71b | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 217 | raw_spin_lock_irqsave(&timekeeper_lock, flags); |
Marcelo Tosatti | e0b306f | 2012-11-27 23:28:59 -0200 | [diff] [blame] | 218 | ret = raw_notifier_chain_register(&pvclock_gtod_chain, nb); |
Marcelo Tosatti | e0b306f | 2012-11-27 23:28:59 -0200 | [diff] [blame] | 219 | update_pvclock_gtod(tk); |
Thomas Gleixner | 9a7a71b | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 220 | raw_spin_unlock_irqrestore(&timekeeper_lock, flags); |
Marcelo Tosatti | e0b306f | 2012-11-27 23:28:59 -0200 | [diff] [blame] | 221 | |
| 222 | return ret; |
| 223 | } |
| 224 | EXPORT_SYMBOL_GPL(pvclock_gtod_register_notifier); |
| 225 | |
| 226 | /** |
| 227 | * pvclock_gtod_unregister_notifier - unregister a pvclock |
| 228 | * timedata update listener |
Marcelo Tosatti | e0b306f | 2012-11-27 23:28:59 -0200 | [diff] [blame] | 229 | */ |
| 230 | int pvclock_gtod_unregister_notifier(struct notifier_block *nb) |
| 231 | { |
Marcelo Tosatti | e0b306f | 2012-11-27 23:28:59 -0200 | [diff] [blame] | 232 | unsigned long flags; |
| 233 | int ret; |
| 234 | |
Thomas Gleixner | 9a7a71b | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 235 | raw_spin_lock_irqsave(&timekeeper_lock, flags); |
Marcelo Tosatti | e0b306f | 2012-11-27 23:28:59 -0200 | [diff] [blame] | 236 | ret = raw_notifier_chain_unregister(&pvclock_gtod_chain, nb); |
Thomas Gleixner | 9a7a71b | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 237 | raw_spin_unlock_irqrestore(&timekeeper_lock, flags); |
Marcelo Tosatti | e0b306f | 2012-11-27 23:28:59 -0200 | [diff] [blame] | 238 | |
| 239 | return ret; |
| 240 | } |
| 241 | EXPORT_SYMBOL_GPL(pvclock_gtod_unregister_notifier); |
| 242 | |
Thomas Gleixner | 9a7a71b | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 243 | /* must hold timekeeper_lock */ |
Thomas Gleixner | 48cdc13 | 2013-02-21 22:51:40 +0000 | [diff] [blame] | 244 | static void timekeeping_update(struct timekeeper *tk, bool clearntp, bool mirror) |
Thomas Gleixner | cc06268 | 2011-11-13 23:19:49 +0000 | [diff] [blame] | 245 | { |
| 246 | if (clearntp) { |
John Stultz | f726a69 | 2012-07-13 01:21:57 -0400 | [diff] [blame] | 247 | tk->ntp_error = 0; |
Thomas Gleixner | cc06268 | 2011-11-13 23:19:49 +0000 | [diff] [blame] | 248 | ntp_clear(); |
| 249 | } |
John Stultz | 576094b | 2012-09-11 19:58:13 -0400 | [diff] [blame] | 250 | update_vsyscall(tk); |
Marcelo Tosatti | e0b306f | 2012-11-27 23:28:59 -0200 | [diff] [blame] | 251 | update_pvclock_gtod(tk); |
Thomas Gleixner | 48cdc13 | 2013-02-21 22:51:40 +0000 | [diff] [blame] | 252 | |
| 253 | if (mirror) |
| 254 | memcpy(&shadow_timekeeper, &timekeeper, sizeof(timekeeper)); |
Thomas Gleixner | cc06268 | 2011-11-13 23:19:49 +0000 | [diff] [blame] | 255 | } |
| 256 | |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 257 | /** |
Martin Schwidefsky | 155ec60 | 2009-08-14 15:47:26 +0200 | [diff] [blame] | 258 | * timekeeping_forward_now - update clock to the current time |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 259 | * |
Roman Zippel | 9a05511 | 2008-08-20 16:37:28 -0700 | [diff] [blame] | 260 | * Forward the current clock to update its state since the last call to |
| 261 | * update_wall_time(). This is useful before significant clock changes, |
| 262 | * as it avoids having to deal with this time offset explicitly. |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 263 | */ |
John Stultz | f726a69 | 2012-07-13 01:21:57 -0400 | [diff] [blame] | 264 | static void timekeeping_forward_now(struct timekeeper *tk) |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 265 | { |
| 266 | cycle_t cycle_now, cycle_delta; |
Martin Schwidefsky | 155ec60 | 2009-08-14 15:47:26 +0200 | [diff] [blame] | 267 | struct clocksource *clock; |
Roman Zippel | 9a05511 | 2008-08-20 16:37:28 -0700 | [diff] [blame] | 268 | s64 nsec; |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 269 | |
John Stultz | f726a69 | 2012-07-13 01:21:57 -0400 | [diff] [blame] | 270 | clock = tk->clock; |
Martin Schwidefsky | a0f7d48 | 2009-08-14 15:47:19 +0200 | [diff] [blame] | 271 | cycle_now = clock->read(clock); |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 272 | cycle_delta = (cycle_now - clock->cycle_last) & clock->mask; |
Thomas Gleixner | 14a3b6a | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 273 | tk->cycle_last = clock->cycle_last = cycle_now; |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 274 | |
John Stultz | f726a69 | 2012-07-13 01:21:57 -0400 | [diff] [blame] | 275 | tk->xtime_nsec += cycle_delta * tk->mult; |
john stultz | 7d27558 | 2009-05-01 13:10:26 -0700 | [diff] [blame] | 276 | |
Stephen Warren | 7b1f620 | 2012-11-07 17:58:54 -0700 | [diff] [blame] | 277 | /* If arch requires, add in get_arch_timeoffset() */ |
| 278 | tk->xtime_nsec += (u64)get_arch_timeoffset() << tk->shift; |
john stultz | 7d27558 | 2009-05-01 13:10:26 -0700 | [diff] [blame] | 279 | |
John Stultz | f726a69 | 2012-07-13 01:21:57 -0400 | [diff] [blame] | 280 | tk_normalize_xtime(tk); |
John Stultz | 2d42244 | 2008-08-20 16:37:30 -0700 | [diff] [blame] | 281 | |
Martin Schwidefsky | 0a54419 | 2009-08-14 15:47:28 +0200 | [diff] [blame] | 282 | nsec = clocksource_cyc2ns(cycle_delta, clock->mult, clock->shift); |
John Stultz | f726a69 | 2012-07-13 01:21:57 -0400 | [diff] [blame] | 283 | timespec_add_ns(&tk->raw_time, nsec); |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 284 | } |
| 285 | |
| 286 | /** |
Kees Cook | 1e817fb | 2012-11-19 10:26:16 -0800 | [diff] [blame] | 287 | * __getnstimeofday - Returns the time of day in a timespec. |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 288 | * @ts: pointer to the timespec to be set |
| 289 | * |
Kees Cook | 1e817fb | 2012-11-19 10:26:16 -0800 | [diff] [blame] | 290 | * Updates the time of day in the timespec. |
| 291 | * Returns 0 on success, or -ve when suspended (timespec will be undefined). |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 292 | */ |
Kees Cook | 1e817fb | 2012-11-19 10:26:16 -0800 | [diff] [blame] | 293 | int __getnstimeofday(struct timespec *ts) |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 294 | { |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 295 | struct timekeeper *tk = &timekeeper; |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 296 | unsigned long seq; |
John Stultz | 1e75fa8 | 2012-07-13 01:21:53 -0400 | [diff] [blame] | 297 | s64 nsecs = 0; |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 298 | |
| 299 | do { |
Thomas Gleixner | 9a7a71b | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 300 | seq = read_seqcount_begin(&timekeeper_seq); |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 301 | |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 302 | ts->tv_sec = tk->xtime_sec; |
John Stultz | ec145ba | 2012-09-11 19:26:03 -0400 | [diff] [blame] | 303 | nsecs = timekeeping_get_ns(tk); |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 304 | |
Thomas Gleixner | 9a7a71b | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 305 | } while (read_seqcount_retry(&timekeeper_seq, seq)); |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 306 | |
John Stultz | ec145ba | 2012-09-11 19:26:03 -0400 | [diff] [blame] | 307 | ts->tv_nsec = 0; |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 308 | timespec_add_ns(ts, nsecs); |
Kees Cook | 1e817fb | 2012-11-19 10:26:16 -0800 | [diff] [blame] | 309 | |
| 310 | /* |
| 311 | * Do not bail out early, in case there were callers still using |
| 312 | * the value, even in the face of the WARN_ON. |
| 313 | */ |
| 314 | if (unlikely(timekeeping_suspended)) |
| 315 | return -EAGAIN; |
| 316 | return 0; |
| 317 | } |
| 318 | EXPORT_SYMBOL(__getnstimeofday); |
| 319 | |
| 320 | /** |
| 321 | * getnstimeofday - Returns the time of day in a timespec. |
| 322 | * @ts: pointer to the timespec to be set |
| 323 | * |
| 324 | * Returns the time of day in a timespec (WARN if suspended). |
| 325 | */ |
| 326 | void getnstimeofday(struct timespec *ts) |
| 327 | { |
| 328 | WARN_ON(__getnstimeofday(ts)); |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 329 | } |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 330 | EXPORT_SYMBOL(getnstimeofday); |
| 331 | |
Martin Schwidefsky | 951ed4d | 2009-07-07 11:27:28 +0200 | [diff] [blame] | 332 | ktime_t ktime_get(void) |
| 333 | { |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 334 | struct timekeeper *tk = &timekeeper; |
Martin Schwidefsky | 951ed4d | 2009-07-07 11:27:28 +0200 | [diff] [blame] | 335 | unsigned int seq; |
| 336 | s64 secs, nsecs; |
| 337 | |
| 338 | WARN_ON(timekeeping_suspended); |
| 339 | |
| 340 | do { |
Thomas Gleixner | 9a7a71b | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 341 | seq = read_seqcount_begin(&timekeeper_seq); |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 342 | secs = tk->xtime_sec + tk->wall_to_monotonic.tv_sec; |
| 343 | nsecs = timekeeping_get_ns(tk) + tk->wall_to_monotonic.tv_nsec; |
Martin Schwidefsky | 951ed4d | 2009-07-07 11:27:28 +0200 | [diff] [blame] | 344 | |
Thomas Gleixner | 9a7a71b | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 345 | } while (read_seqcount_retry(&timekeeper_seq, seq)); |
Martin Schwidefsky | 951ed4d | 2009-07-07 11:27:28 +0200 | [diff] [blame] | 346 | /* |
| 347 | * Use ktime_set/ktime_add_ns to create a proper ktime on |
| 348 | * 32-bit architectures without CONFIG_KTIME_SCALAR. |
| 349 | */ |
| 350 | return ktime_add_ns(ktime_set(secs, 0), nsecs); |
| 351 | } |
| 352 | EXPORT_SYMBOL_GPL(ktime_get); |
| 353 | |
| 354 | /** |
| 355 | * ktime_get_ts - get the monotonic clock in timespec format |
| 356 | * @ts: pointer to timespec variable |
| 357 | * |
| 358 | * The function calculates the monotonic clock from the realtime |
| 359 | * clock and the wall_to_monotonic offset and stores the result |
| 360 | * in normalized timespec format in the variable pointed to by @ts. |
| 361 | */ |
| 362 | void ktime_get_ts(struct timespec *ts) |
| 363 | { |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 364 | struct timekeeper *tk = &timekeeper; |
Martin Schwidefsky | 951ed4d | 2009-07-07 11:27:28 +0200 | [diff] [blame] | 365 | struct timespec tomono; |
John Stultz | ec145ba | 2012-09-11 19:26:03 -0400 | [diff] [blame] | 366 | s64 nsec; |
Martin Schwidefsky | 951ed4d | 2009-07-07 11:27:28 +0200 | [diff] [blame] | 367 | unsigned int seq; |
Martin Schwidefsky | 951ed4d | 2009-07-07 11:27:28 +0200 | [diff] [blame] | 368 | |
| 369 | WARN_ON(timekeeping_suspended); |
| 370 | |
| 371 | do { |
Thomas Gleixner | 9a7a71b | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 372 | seq = read_seqcount_begin(&timekeeper_seq); |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 373 | ts->tv_sec = tk->xtime_sec; |
John Stultz | ec145ba | 2012-09-11 19:26:03 -0400 | [diff] [blame] | 374 | nsec = timekeeping_get_ns(tk); |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 375 | tomono = tk->wall_to_monotonic; |
Martin Schwidefsky | 951ed4d | 2009-07-07 11:27:28 +0200 | [diff] [blame] | 376 | |
Thomas Gleixner | 9a7a71b | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 377 | } while (read_seqcount_retry(&timekeeper_seq, seq)); |
Martin Schwidefsky | 951ed4d | 2009-07-07 11:27:28 +0200 | [diff] [blame] | 378 | |
John Stultz | ec145ba | 2012-09-11 19:26:03 -0400 | [diff] [blame] | 379 | ts->tv_sec += tomono.tv_sec; |
| 380 | ts->tv_nsec = 0; |
| 381 | timespec_add_ns(ts, nsec + tomono.tv_nsec); |
Martin Schwidefsky | 951ed4d | 2009-07-07 11:27:28 +0200 | [diff] [blame] | 382 | } |
| 383 | EXPORT_SYMBOL_GPL(ktime_get_ts); |
| 384 | |
John Stultz | 1ff3c96 | 2012-05-03 12:43:40 -0700 | [diff] [blame] | 385 | |
| 386 | /** |
| 387 | * timekeeping_clocktai - Returns the TAI time of day in a timespec |
| 388 | * @ts: pointer to the timespec to be set |
| 389 | * |
| 390 | * Returns the time of day in a timespec. |
| 391 | */ |
| 392 | void timekeeping_clocktai(struct timespec *ts) |
| 393 | { |
| 394 | struct timekeeper *tk = &timekeeper; |
| 395 | unsigned long seq; |
| 396 | u64 nsecs; |
| 397 | |
| 398 | WARN_ON(timekeeping_suspended); |
| 399 | |
| 400 | do { |
Thomas Gleixner | 9a7a71b | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 401 | seq = read_seqcount_begin(&timekeeper_seq); |
John Stultz | 1ff3c96 | 2012-05-03 12:43:40 -0700 | [diff] [blame] | 402 | |
| 403 | ts->tv_sec = tk->xtime_sec + tk->tai_offset; |
| 404 | nsecs = timekeeping_get_ns(tk); |
| 405 | |
Thomas Gleixner | 9a7a71b | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 406 | } while (read_seqcount_retry(&timekeeper_seq, seq)); |
John Stultz | 1ff3c96 | 2012-05-03 12:43:40 -0700 | [diff] [blame] | 407 | |
| 408 | ts->tv_nsec = 0; |
| 409 | timespec_add_ns(ts, nsecs); |
| 410 | |
| 411 | } |
| 412 | EXPORT_SYMBOL(timekeeping_clocktai); |
| 413 | |
| 414 | |
John Stultz | 90adda9 | 2013-01-21 17:00:11 -0800 | [diff] [blame] | 415 | /** |
| 416 | * ktime_get_clocktai - Returns the TAI time of day in a ktime |
| 417 | * |
| 418 | * Returns the time of day in a ktime. |
| 419 | */ |
| 420 | ktime_t ktime_get_clocktai(void) |
| 421 | { |
| 422 | struct timespec ts; |
| 423 | |
| 424 | timekeeping_clocktai(&ts); |
| 425 | return timespec_to_ktime(ts); |
| 426 | } |
| 427 | EXPORT_SYMBOL(ktime_get_clocktai); |
| 428 | |
Alexander Gordeev | e2c18e4 | 2011-01-12 17:00:57 -0800 | [diff] [blame] | 429 | #ifdef CONFIG_NTP_PPS |
| 430 | |
| 431 | /** |
| 432 | * getnstime_raw_and_real - get day and raw monotonic time in timespec format |
| 433 | * @ts_raw: pointer to the timespec to be set to raw monotonic time |
| 434 | * @ts_real: pointer to the timespec to be set to the time of day |
| 435 | * |
| 436 | * This function reads both the time of day and raw monotonic time at the |
| 437 | * same time atomically and stores the resulting timestamps in timespec |
| 438 | * format. |
| 439 | */ |
| 440 | void getnstime_raw_and_real(struct timespec *ts_raw, struct timespec *ts_real) |
| 441 | { |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 442 | struct timekeeper *tk = &timekeeper; |
Alexander Gordeev | e2c18e4 | 2011-01-12 17:00:57 -0800 | [diff] [blame] | 443 | unsigned long seq; |
| 444 | s64 nsecs_raw, nsecs_real; |
| 445 | |
| 446 | WARN_ON_ONCE(timekeeping_suspended); |
| 447 | |
| 448 | do { |
Thomas Gleixner | 9a7a71b | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 449 | seq = read_seqcount_begin(&timekeeper_seq); |
Alexander Gordeev | e2c18e4 | 2011-01-12 17:00:57 -0800 | [diff] [blame] | 450 | |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 451 | *ts_raw = tk->raw_time; |
| 452 | ts_real->tv_sec = tk->xtime_sec; |
John Stultz | 1e75fa8 | 2012-07-13 01:21:53 -0400 | [diff] [blame] | 453 | ts_real->tv_nsec = 0; |
Alexander Gordeev | e2c18e4 | 2011-01-12 17:00:57 -0800 | [diff] [blame] | 454 | |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 455 | nsecs_raw = timekeeping_get_ns_raw(tk); |
| 456 | nsecs_real = timekeeping_get_ns(tk); |
Alexander Gordeev | e2c18e4 | 2011-01-12 17:00:57 -0800 | [diff] [blame] | 457 | |
Thomas Gleixner | 9a7a71b | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 458 | } while (read_seqcount_retry(&timekeeper_seq, seq)); |
Alexander Gordeev | e2c18e4 | 2011-01-12 17:00:57 -0800 | [diff] [blame] | 459 | |
| 460 | timespec_add_ns(ts_raw, nsecs_raw); |
| 461 | timespec_add_ns(ts_real, nsecs_real); |
| 462 | } |
| 463 | EXPORT_SYMBOL(getnstime_raw_and_real); |
| 464 | |
| 465 | #endif /* CONFIG_NTP_PPS */ |
| 466 | |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 467 | /** |
| 468 | * do_gettimeofday - Returns the time of day in a timeval |
| 469 | * @tv: pointer to the timeval to be set |
| 470 | * |
Geert Uytterhoeven | efd9ac8 | 2008-01-30 13:30:01 +0100 | [diff] [blame] | 471 | * NOTE: Users should be converted to using getnstimeofday() |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 472 | */ |
| 473 | void do_gettimeofday(struct timeval *tv) |
| 474 | { |
| 475 | struct timespec now; |
| 476 | |
Geert Uytterhoeven | efd9ac8 | 2008-01-30 13:30:01 +0100 | [diff] [blame] | 477 | getnstimeofday(&now); |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 478 | tv->tv_sec = now.tv_sec; |
| 479 | tv->tv_usec = now.tv_nsec/1000; |
| 480 | } |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 481 | EXPORT_SYMBOL(do_gettimeofday); |
Richard Cochran | d239f49 | 2012-04-27 10:12:42 +0200 | [diff] [blame] | 482 | |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 483 | /** |
| 484 | * do_settimeofday - Sets the time of day |
| 485 | * @tv: pointer to the timespec variable containing the new time |
| 486 | * |
| 487 | * Sets the time of day to the new time and update NTP and notify hrtimers |
| 488 | */ |
Richard Cochran | 1e6d767 | 2011-02-01 13:50:58 +0000 | [diff] [blame] | 489 | int do_settimeofday(const struct timespec *tv) |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 490 | { |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 491 | struct timekeeper *tk = &timekeeper; |
John Stultz | 1e75fa8 | 2012-07-13 01:21:53 -0400 | [diff] [blame] | 492 | struct timespec ts_delta, xt; |
John Stultz | 92c1d3e | 2011-11-14 14:05:44 -0800 | [diff] [blame] | 493 | unsigned long flags; |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 494 | |
John Stultz | cee5848 | 2012-08-31 13:30:06 -0400 | [diff] [blame] | 495 | if (!timespec_valid_strict(tv)) |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 496 | return -EINVAL; |
| 497 | |
Thomas Gleixner | 9a7a71b | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 498 | raw_spin_lock_irqsave(&timekeeper_lock, flags); |
| 499 | write_seqcount_begin(&timekeeper_seq); |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 500 | |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 501 | timekeeping_forward_now(tk); |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 502 | |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 503 | xt = tk_xtime(tk); |
John Stultz | 1e75fa8 | 2012-07-13 01:21:53 -0400 | [diff] [blame] | 504 | ts_delta.tv_sec = tv->tv_sec - xt.tv_sec; |
| 505 | ts_delta.tv_nsec = tv->tv_nsec - xt.tv_nsec; |
| 506 | |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 507 | tk_set_wall_to_mono(tk, timespec_sub(tk->wall_to_monotonic, ts_delta)); |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 508 | |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 509 | tk_set_xtime(tk, tv); |
John Stultz | 1e75fa8 | 2012-07-13 01:21:53 -0400 | [diff] [blame] | 510 | |
Thomas Gleixner | 48cdc13 | 2013-02-21 22:51:40 +0000 | [diff] [blame] | 511 | timekeeping_update(tk, true, true); |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 512 | |
Thomas Gleixner | 9a7a71b | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 513 | write_seqcount_end(&timekeeper_seq); |
| 514 | raw_spin_unlock_irqrestore(&timekeeper_lock, flags); |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 515 | |
| 516 | /* signal hrtimers about time change */ |
| 517 | clock_was_set(); |
| 518 | |
| 519 | return 0; |
| 520 | } |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 521 | EXPORT_SYMBOL(do_settimeofday); |
| 522 | |
John Stultz | c528f7c | 2011-02-01 13:52:17 +0000 | [diff] [blame] | 523 | /** |
| 524 | * timekeeping_inject_offset - Adds or subtracts from the current time. |
| 525 | * @tv: pointer to the timespec variable containing the offset |
| 526 | * |
| 527 | * Adds or subtracts an offset value from the current time. |
| 528 | */ |
| 529 | int timekeeping_inject_offset(struct timespec *ts) |
| 530 | { |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 531 | struct timekeeper *tk = &timekeeper; |
John Stultz | 92c1d3e | 2011-11-14 14:05:44 -0800 | [diff] [blame] | 532 | unsigned long flags; |
John Stultz | 4e8b145 | 2012-08-08 15:36:20 -0400 | [diff] [blame] | 533 | struct timespec tmp; |
| 534 | int ret = 0; |
John Stultz | c528f7c | 2011-02-01 13:52:17 +0000 | [diff] [blame] | 535 | |
| 536 | if ((unsigned long)ts->tv_nsec >= NSEC_PER_SEC) |
| 537 | return -EINVAL; |
| 538 | |
Thomas Gleixner | 9a7a71b | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 539 | raw_spin_lock_irqsave(&timekeeper_lock, flags); |
| 540 | write_seqcount_begin(&timekeeper_seq); |
John Stultz | c528f7c | 2011-02-01 13:52:17 +0000 | [diff] [blame] | 541 | |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 542 | timekeeping_forward_now(tk); |
John Stultz | c528f7c | 2011-02-01 13:52:17 +0000 | [diff] [blame] | 543 | |
John Stultz | 4e8b145 | 2012-08-08 15:36:20 -0400 | [diff] [blame] | 544 | /* Make sure the proposed value is valid */ |
| 545 | tmp = timespec_add(tk_xtime(tk), *ts); |
John Stultz | cee5848 | 2012-08-31 13:30:06 -0400 | [diff] [blame] | 546 | if (!timespec_valid_strict(&tmp)) { |
John Stultz | 4e8b145 | 2012-08-08 15:36:20 -0400 | [diff] [blame] | 547 | ret = -EINVAL; |
| 548 | goto error; |
| 549 | } |
John Stultz | 1e75fa8 | 2012-07-13 01:21:53 -0400 | [diff] [blame] | 550 | |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 551 | tk_xtime_add(tk, ts); |
| 552 | tk_set_wall_to_mono(tk, timespec_sub(tk->wall_to_monotonic, *ts)); |
John Stultz | c528f7c | 2011-02-01 13:52:17 +0000 | [diff] [blame] | 553 | |
John Stultz | 4e8b145 | 2012-08-08 15:36:20 -0400 | [diff] [blame] | 554 | error: /* even if we error out, we forwarded the time, so call update */ |
Thomas Gleixner | 48cdc13 | 2013-02-21 22:51:40 +0000 | [diff] [blame] | 555 | timekeeping_update(tk, true, true); |
John Stultz | c528f7c | 2011-02-01 13:52:17 +0000 | [diff] [blame] | 556 | |
Thomas Gleixner | 9a7a71b | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 557 | write_seqcount_end(&timekeeper_seq); |
| 558 | raw_spin_unlock_irqrestore(&timekeeper_lock, flags); |
John Stultz | c528f7c | 2011-02-01 13:52:17 +0000 | [diff] [blame] | 559 | |
| 560 | /* signal hrtimers about time change */ |
| 561 | clock_was_set(); |
| 562 | |
John Stultz | 4e8b145 | 2012-08-08 15:36:20 -0400 | [diff] [blame] | 563 | return ret; |
John Stultz | c528f7c | 2011-02-01 13:52:17 +0000 | [diff] [blame] | 564 | } |
| 565 | EXPORT_SYMBOL(timekeeping_inject_offset); |
| 566 | |
John Stultz | cc244dd | 2012-05-03 12:30:07 -0700 | [diff] [blame] | 567 | |
| 568 | /** |
| 569 | * timekeeping_get_tai_offset - Returns current TAI offset from UTC |
| 570 | * |
| 571 | */ |
| 572 | s32 timekeeping_get_tai_offset(void) |
| 573 | { |
| 574 | struct timekeeper *tk = &timekeeper; |
| 575 | unsigned int seq; |
| 576 | s32 ret; |
| 577 | |
| 578 | do { |
Thomas Gleixner | 9a7a71b | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 579 | seq = read_seqcount_begin(&timekeeper_seq); |
John Stultz | cc244dd | 2012-05-03 12:30:07 -0700 | [diff] [blame] | 580 | ret = tk->tai_offset; |
Thomas Gleixner | 9a7a71b | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 581 | } while (read_seqcount_retry(&timekeeper_seq, seq)); |
John Stultz | cc244dd | 2012-05-03 12:30:07 -0700 | [diff] [blame] | 582 | |
| 583 | return ret; |
| 584 | } |
| 585 | |
| 586 | /** |
| 587 | * __timekeeping_set_tai_offset - Lock free worker function |
| 588 | * |
| 589 | */ |
Fengguang Wu | dd5d70e | 2013-03-25 12:24:24 -0700 | [diff] [blame] | 590 | static void __timekeeping_set_tai_offset(struct timekeeper *tk, s32 tai_offset) |
John Stultz | cc244dd | 2012-05-03 12:30:07 -0700 | [diff] [blame] | 591 | { |
| 592 | tk->tai_offset = tai_offset; |
John Stultz | 90adda9 | 2013-01-21 17:00:11 -0800 | [diff] [blame] | 593 | tk->offs_tai = ktime_sub(tk->offs_real, ktime_set(tai_offset, 0)); |
John Stultz | cc244dd | 2012-05-03 12:30:07 -0700 | [diff] [blame] | 594 | } |
| 595 | |
| 596 | /** |
| 597 | * timekeeping_set_tai_offset - Sets the current TAI offset from UTC |
| 598 | * |
| 599 | */ |
| 600 | void timekeeping_set_tai_offset(s32 tai_offset) |
| 601 | { |
| 602 | struct timekeeper *tk = &timekeeper; |
| 603 | unsigned long flags; |
| 604 | |
Thomas Gleixner | 9a7a71b | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 605 | raw_spin_lock_irqsave(&timekeeper_lock, flags); |
| 606 | write_seqcount_begin(&timekeeper_seq); |
John Stultz | cc244dd | 2012-05-03 12:30:07 -0700 | [diff] [blame] | 607 | __timekeeping_set_tai_offset(tk, tai_offset); |
Thomas Gleixner | 9a7a71b | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 608 | write_seqcount_end(&timekeeper_seq); |
| 609 | raw_spin_unlock_irqrestore(&timekeeper_lock, flags); |
John Stultz | cc244dd | 2012-05-03 12:30:07 -0700 | [diff] [blame] | 610 | } |
| 611 | |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 612 | /** |
| 613 | * change_clocksource - Swaps clocksources if a new one is available |
| 614 | * |
| 615 | * Accumulates current time interval and initializes new clocksource |
| 616 | */ |
Martin Schwidefsky | 75c5158 | 2009-08-14 15:47:30 +0200 | [diff] [blame] | 617 | static int change_clocksource(void *data) |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 618 | { |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 619 | struct timekeeper *tk = &timekeeper; |
Magnus Damm | 4614e6a | 2009-04-21 12:24:02 -0700 | [diff] [blame] | 620 | struct clocksource *new, *old; |
John Stultz | f695cf9 | 2012-03-14 16:38:15 -0700 | [diff] [blame] | 621 | unsigned long flags; |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 622 | |
Martin Schwidefsky | 75c5158 | 2009-08-14 15:47:30 +0200 | [diff] [blame] | 623 | new = (struct clocksource *) data; |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 624 | |
Thomas Gleixner | 9a7a71b | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 625 | raw_spin_lock_irqsave(&timekeeper_lock, flags); |
| 626 | write_seqcount_begin(&timekeeper_seq); |
John Stultz | f695cf9 | 2012-03-14 16:38:15 -0700 | [diff] [blame] | 627 | |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 628 | timekeeping_forward_now(tk); |
Martin Schwidefsky | 75c5158 | 2009-08-14 15:47:30 +0200 | [diff] [blame] | 629 | if (!new->enable || new->enable(new) == 0) { |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 630 | old = tk->clock; |
| 631 | tk_setup_internals(tk, new); |
Martin Schwidefsky | 75c5158 | 2009-08-14 15:47:30 +0200 | [diff] [blame] | 632 | if (old->disable) |
| 633 | old->disable(old); |
| 634 | } |
Thomas Gleixner | 48cdc13 | 2013-02-21 22:51:40 +0000 | [diff] [blame] | 635 | timekeeping_update(tk, true, true); |
John Stultz | f695cf9 | 2012-03-14 16:38:15 -0700 | [diff] [blame] | 636 | |
Thomas Gleixner | 9a7a71b | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 637 | write_seqcount_end(&timekeeper_seq); |
| 638 | raw_spin_unlock_irqrestore(&timekeeper_lock, flags); |
John Stultz | f695cf9 | 2012-03-14 16:38:15 -0700 | [diff] [blame] | 639 | |
Martin Schwidefsky | 75c5158 | 2009-08-14 15:47:30 +0200 | [diff] [blame] | 640 | return 0; |
| 641 | } |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 642 | |
Martin Schwidefsky | 75c5158 | 2009-08-14 15:47:30 +0200 | [diff] [blame] | 643 | /** |
| 644 | * timekeeping_notify - Install a new clock source |
| 645 | * @clock: pointer to the clock source |
| 646 | * |
| 647 | * This function is called from clocksource.c after a new, better clock |
| 648 | * source has been registered. The caller holds the clocksource_mutex. |
| 649 | */ |
| 650 | void timekeeping_notify(struct clocksource *clock) |
| 651 | { |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 652 | struct timekeeper *tk = &timekeeper; |
| 653 | |
| 654 | if (tk->clock == clock) |
Magnus Damm | 4614e6a | 2009-04-21 12:24:02 -0700 | [diff] [blame] | 655 | return; |
Martin Schwidefsky | 75c5158 | 2009-08-14 15:47:30 +0200 | [diff] [blame] | 656 | stop_machine(change_clocksource, clock, NULL); |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 657 | tick_clock_notify(); |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 658 | } |
Martin Schwidefsky | 75c5158 | 2009-08-14 15:47:30 +0200 | [diff] [blame] | 659 | |
Thomas Gleixner | a40f262 | 2009-07-07 13:00:31 +0200 | [diff] [blame] | 660 | /** |
| 661 | * ktime_get_real - get the real (wall-) time in ktime_t format |
| 662 | * |
| 663 | * returns the time in ktime_t format |
| 664 | */ |
| 665 | ktime_t ktime_get_real(void) |
| 666 | { |
| 667 | struct timespec now; |
| 668 | |
| 669 | getnstimeofday(&now); |
| 670 | |
| 671 | return timespec_to_ktime(now); |
| 672 | } |
| 673 | EXPORT_SYMBOL_GPL(ktime_get_real); |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 674 | |
| 675 | /** |
John Stultz | 2d42244 | 2008-08-20 16:37:30 -0700 | [diff] [blame] | 676 | * getrawmonotonic - Returns the raw monotonic time in a timespec |
| 677 | * @ts: pointer to the timespec to be set |
| 678 | * |
| 679 | * Returns the raw monotonic time (completely un-modified by ntp) |
| 680 | */ |
| 681 | void getrawmonotonic(struct timespec *ts) |
| 682 | { |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 683 | struct timekeeper *tk = &timekeeper; |
John Stultz | 2d42244 | 2008-08-20 16:37:30 -0700 | [diff] [blame] | 684 | unsigned long seq; |
| 685 | s64 nsecs; |
John Stultz | 2d42244 | 2008-08-20 16:37:30 -0700 | [diff] [blame] | 686 | |
| 687 | do { |
Thomas Gleixner | 9a7a71b | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 688 | seq = read_seqcount_begin(&timekeeper_seq); |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 689 | nsecs = timekeeping_get_ns_raw(tk); |
| 690 | *ts = tk->raw_time; |
John Stultz | 2d42244 | 2008-08-20 16:37:30 -0700 | [diff] [blame] | 691 | |
Thomas Gleixner | 9a7a71b | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 692 | } while (read_seqcount_retry(&timekeeper_seq, seq)); |
John Stultz | 2d42244 | 2008-08-20 16:37:30 -0700 | [diff] [blame] | 693 | |
| 694 | timespec_add_ns(ts, nsecs); |
| 695 | } |
| 696 | EXPORT_SYMBOL(getrawmonotonic); |
| 697 | |
John Stultz | 2d42244 | 2008-08-20 16:37:30 -0700 | [diff] [blame] | 698 | /** |
Li Zefan | cf4fc6c | 2008-02-08 04:19:24 -0800 | [diff] [blame] | 699 | * timekeeping_valid_for_hres - Check if timekeeping is suitable for hres |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 700 | */ |
Li Zefan | cf4fc6c | 2008-02-08 04:19:24 -0800 | [diff] [blame] | 701 | int timekeeping_valid_for_hres(void) |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 702 | { |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 703 | struct timekeeper *tk = &timekeeper; |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 704 | unsigned long seq; |
| 705 | int ret; |
| 706 | |
| 707 | do { |
Thomas Gleixner | 9a7a71b | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 708 | seq = read_seqcount_begin(&timekeeper_seq); |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 709 | |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 710 | ret = tk->clock->flags & CLOCK_SOURCE_VALID_FOR_HRES; |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 711 | |
Thomas Gleixner | 9a7a71b | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 712 | } while (read_seqcount_retry(&timekeeper_seq, seq)); |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 713 | |
| 714 | return ret; |
| 715 | } |
| 716 | |
| 717 | /** |
Jon Hunter | 9896246 | 2009-08-18 12:45:10 -0500 | [diff] [blame] | 718 | * timekeeping_max_deferment - Returns max time the clocksource can be deferred |
Jon Hunter | 9896246 | 2009-08-18 12:45:10 -0500 | [diff] [blame] | 719 | */ |
| 720 | u64 timekeeping_max_deferment(void) |
| 721 | { |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 722 | struct timekeeper *tk = &timekeeper; |
John Stultz | 70471f2 | 2011-11-14 12:48:10 -0800 | [diff] [blame] | 723 | unsigned long seq; |
| 724 | u64 ret; |
John Stultz | 42e71e8 | 2012-07-13 01:21:51 -0400 | [diff] [blame] | 725 | |
John Stultz | 70471f2 | 2011-11-14 12:48:10 -0800 | [diff] [blame] | 726 | do { |
Thomas Gleixner | 9a7a71b | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 727 | seq = read_seqcount_begin(&timekeeper_seq); |
John Stultz | 70471f2 | 2011-11-14 12:48:10 -0800 | [diff] [blame] | 728 | |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 729 | ret = tk->clock->max_idle_ns; |
John Stultz | 70471f2 | 2011-11-14 12:48:10 -0800 | [diff] [blame] | 730 | |
Thomas Gleixner | 9a7a71b | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 731 | } while (read_seqcount_retry(&timekeeper_seq, seq)); |
John Stultz | 70471f2 | 2011-11-14 12:48:10 -0800 | [diff] [blame] | 732 | |
| 733 | return ret; |
Jon Hunter | 9896246 | 2009-08-18 12:45:10 -0500 | [diff] [blame] | 734 | } |
| 735 | |
| 736 | /** |
Martin Schwidefsky | d4f587c | 2009-08-14 15:47:31 +0200 | [diff] [blame] | 737 | * read_persistent_clock - Return time from the persistent clock. |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 738 | * |
| 739 | * Weak dummy function for arches that do not yet support it. |
Martin Schwidefsky | d4f587c | 2009-08-14 15:47:31 +0200 | [diff] [blame] | 740 | * Reads the time from the battery backed persistent clock. |
| 741 | * Returns a timespec with tv_sec=0 and tv_nsec=0 if unsupported. |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 742 | * |
| 743 | * XXX - Do be sure to remove it once all arches implement it. |
| 744 | */ |
Martin Schwidefsky | d4f587c | 2009-08-14 15:47:31 +0200 | [diff] [blame] | 745 | void __attribute__((weak)) read_persistent_clock(struct timespec *ts) |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 746 | { |
Martin Schwidefsky | d4f587c | 2009-08-14 15:47:31 +0200 | [diff] [blame] | 747 | ts->tv_sec = 0; |
| 748 | ts->tv_nsec = 0; |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 749 | } |
| 750 | |
Martin Schwidefsky | 23970e3 | 2009-08-14 15:47:32 +0200 | [diff] [blame] | 751 | /** |
| 752 | * read_boot_clock - Return time of the system start. |
| 753 | * |
| 754 | * Weak dummy function for arches that do not yet support it. |
| 755 | * Function to read the exact time the system has been started. |
| 756 | * Returns a timespec with tv_sec=0 and tv_nsec=0 if unsupported. |
| 757 | * |
| 758 | * XXX - Do be sure to remove it once all arches implement it. |
| 759 | */ |
| 760 | void __attribute__((weak)) read_boot_clock(struct timespec *ts) |
| 761 | { |
| 762 | ts->tv_sec = 0; |
| 763 | ts->tv_nsec = 0; |
| 764 | } |
| 765 | |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 766 | /* |
| 767 | * timekeeping_init - Initializes the clocksource and common timekeeping values |
| 768 | */ |
| 769 | void __init timekeeping_init(void) |
| 770 | { |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 771 | struct timekeeper *tk = &timekeeper; |
Martin Schwidefsky | 155ec60 | 2009-08-14 15:47:26 +0200 | [diff] [blame] | 772 | struct clocksource *clock; |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 773 | unsigned long flags; |
John Stultz | 6d0ef90 | 2012-07-27 14:48:12 -0400 | [diff] [blame] | 774 | struct timespec now, boot, tmp; |
Martin Schwidefsky | d4f587c | 2009-08-14 15:47:31 +0200 | [diff] [blame] | 775 | |
| 776 | read_persistent_clock(&now); |
Feng Tang | 31ade30 | 2013-01-16 00:09:47 +0800 | [diff] [blame] | 777 | |
John Stultz | cee5848 | 2012-08-31 13:30:06 -0400 | [diff] [blame] | 778 | if (!timespec_valid_strict(&now)) { |
John Stultz | 4e8b145 | 2012-08-08 15:36:20 -0400 | [diff] [blame] | 779 | pr_warn("WARNING: Persistent clock returned invalid value!\n" |
| 780 | " Check your CMOS/BIOS settings.\n"); |
| 781 | now.tv_sec = 0; |
| 782 | now.tv_nsec = 0; |
Feng Tang | 31ade30 | 2013-01-16 00:09:47 +0800 | [diff] [blame] | 783 | } else if (now.tv_sec || now.tv_nsec) |
| 784 | persistent_clock_exist = true; |
John Stultz | 4e8b145 | 2012-08-08 15:36:20 -0400 | [diff] [blame] | 785 | |
Martin Schwidefsky | 23970e3 | 2009-08-14 15:47:32 +0200 | [diff] [blame] | 786 | read_boot_clock(&boot); |
John Stultz | cee5848 | 2012-08-31 13:30:06 -0400 | [diff] [blame] | 787 | if (!timespec_valid_strict(&boot)) { |
John Stultz | 4e8b145 | 2012-08-08 15:36:20 -0400 | [diff] [blame] | 788 | pr_warn("WARNING: Boot clock returned invalid value!\n" |
| 789 | " Check your CMOS/BIOS settings.\n"); |
| 790 | boot.tv_sec = 0; |
| 791 | boot.tv_nsec = 0; |
| 792 | } |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 793 | |
Thomas Gleixner | 9a7a71b | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 794 | raw_spin_lock_irqsave(&timekeeper_lock, flags); |
| 795 | write_seqcount_begin(&timekeeper_seq); |
John Stultz | 06c017f | 2013-03-22 11:37:28 -0700 | [diff] [blame] | 796 | ntp_init(); |
| 797 | |
Martin Schwidefsky | f1b8274 | 2009-08-14 15:47:21 +0200 | [diff] [blame] | 798 | clock = clocksource_default_clock(); |
Martin Schwidefsky | a0f7d48 | 2009-08-14 15:47:19 +0200 | [diff] [blame] | 799 | if (clock->enable) |
| 800 | clock->enable(clock); |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 801 | tk_setup_internals(tk, clock); |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 802 | |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 803 | tk_set_xtime(tk, &now); |
| 804 | tk->raw_time.tv_sec = 0; |
| 805 | tk->raw_time.tv_nsec = 0; |
John Stultz | 1e75fa8 | 2012-07-13 01:21:53 -0400 | [diff] [blame] | 806 | if (boot.tv_sec == 0 && boot.tv_nsec == 0) |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 807 | boot = tk_xtime(tk); |
John Stultz | 1e75fa8 | 2012-07-13 01:21:53 -0400 | [diff] [blame] | 808 | |
John Stultz | 6d0ef90 | 2012-07-27 14:48:12 -0400 | [diff] [blame] | 809 | set_normalized_timespec(&tmp, -boot.tv_sec, -boot.tv_nsec); |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 810 | tk_set_wall_to_mono(tk, tmp); |
John Stultz | 6d0ef90 | 2012-07-27 14:48:12 -0400 | [diff] [blame] | 811 | |
| 812 | tmp.tv_sec = 0; |
| 813 | tmp.tv_nsec = 0; |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 814 | tk_set_sleep_time(tk, tmp); |
John Stultz | 6d0ef90 | 2012-07-27 14:48:12 -0400 | [diff] [blame] | 815 | |
Thomas Gleixner | 48cdc13 | 2013-02-21 22:51:40 +0000 | [diff] [blame] | 816 | memcpy(&shadow_timekeeper, &timekeeper, sizeof(timekeeper)); |
| 817 | |
Thomas Gleixner | 9a7a71b | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 818 | write_seqcount_end(&timekeeper_seq); |
| 819 | raw_spin_unlock_irqrestore(&timekeeper_lock, flags); |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 820 | } |
| 821 | |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 822 | /* time in seconds when suspend began */ |
Martin Schwidefsky | d4f587c | 2009-08-14 15:47:31 +0200 | [diff] [blame] | 823 | static struct timespec timekeeping_suspend_time; |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 824 | |
| 825 | /** |
John Stultz | 304529b | 2011-04-01 14:32:09 -0700 | [diff] [blame] | 826 | * __timekeeping_inject_sleeptime - Internal function to add sleep interval |
| 827 | * @delta: pointer to a timespec delta value |
| 828 | * |
| 829 | * Takes a timespec offset measuring a suspend interval and properly |
| 830 | * adds the sleep offset to the timekeeping variables. |
| 831 | */ |
John Stultz | f726a69 | 2012-07-13 01:21:57 -0400 | [diff] [blame] | 832 | static void __timekeeping_inject_sleeptime(struct timekeeper *tk, |
| 833 | struct timespec *delta) |
John Stultz | 304529b | 2011-04-01 14:32:09 -0700 | [diff] [blame] | 834 | { |
John Stultz | cee5848 | 2012-08-31 13:30:06 -0400 | [diff] [blame] | 835 | if (!timespec_valid_strict(delta)) { |
John Stultz | cbaa515 | 2011-07-20 15:42:55 -0700 | [diff] [blame] | 836 | printk(KERN_WARNING "__timekeeping_inject_sleeptime: Invalid " |
John Stultz | cb5de2f8d | 2011-06-01 18:18:09 -0700 | [diff] [blame] | 837 | "sleep delta value!\n"); |
| 838 | return; |
| 839 | } |
John Stultz | f726a69 | 2012-07-13 01:21:57 -0400 | [diff] [blame] | 840 | tk_xtime_add(tk, delta); |
John Stultz | 6d0ef90 | 2012-07-27 14:48:12 -0400 | [diff] [blame] | 841 | tk_set_wall_to_mono(tk, timespec_sub(tk->wall_to_monotonic, *delta)); |
| 842 | tk_set_sleep_time(tk, timespec_add(tk->total_sleep_time, *delta)); |
John Stultz | 304529b | 2011-04-01 14:32:09 -0700 | [diff] [blame] | 843 | } |
| 844 | |
John Stultz | 304529b | 2011-04-01 14:32:09 -0700 | [diff] [blame] | 845 | /** |
| 846 | * timekeeping_inject_sleeptime - Adds suspend interval to timeekeeping values |
| 847 | * @delta: pointer to a timespec delta value |
| 848 | * |
| 849 | * This hook is for architectures that cannot support read_persistent_clock |
| 850 | * because their RTC/persistent clock is only accessible when irqs are enabled. |
| 851 | * |
| 852 | * This function should only be called by rtc_resume(), and allows |
| 853 | * a suspend offset to be injected into the timekeeping values. |
| 854 | */ |
| 855 | void timekeeping_inject_sleeptime(struct timespec *delta) |
| 856 | { |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 857 | struct timekeeper *tk = &timekeeper; |
John Stultz | 92c1d3e | 2011-11-14 14:05:44 -0800 | [diff] [blame] | 858 | unsigned long flags; |
John Stultz | 304529b | 2011-04-01 14:32:09 -0700 | [diff] [blame] | 859 | |
Feng Tang | 31ade30 | 2013-01-16 00:09:47 +0800 | [diff] [blame] | 860 | /* |
| 861 | * Make sure we don't set the clock twice, as timekeeping_resume() |
| 862 | * already did it |
| 863 | */ |
| 864 | if (has_persistent_clock()) |
John Stultz | 304529b | 2011-04-01 14:32:09 -0700 | [diff] [blame] | 865 | return; |
| 866 | |
Thomas Gleixner | 9a7a71b | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 867 | raw_spin_lock_irqsave(&timekeeper_lock, flags); |
| 868 | write_seqcount_begin(&timekeeper_seq); |
John Stultz | 70471f2 | 2011-11-14 12:48:10 -0800 | [diff] [blame] | 869 | |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 870 | timekeeping_forward_now(tk); |
John Stultz | 304529b | 2011-04-01 14:32:09 -0700 | [diff] [blame] | 871 | |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 872 | __timekeeping_inject_sleeptime(tk, delta); |
John Stultz | 304529b | 2011-04-01 14:32:09 -0700 | [diff] [blame] | 873 | |
Thomas Gleixner | 48cdc13 | 2013-02-21 22:51:40 +0000 | [diff] [blame] | 874 | timekeeping_update(tk, true, true); |
John Stultz | 304529b | 2011-04-01 14:32:09 -0700 | [diff] [blame] | 875 | |
Thomas Gleixner | 9a7a71b | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 876 | write_seqcount_end(&timekeeper_seq); |
| 877 | raw_spin_unlock_irqrestore(&timekeeper_lock, flags); |
John Stultz | 304529b | 2011-04-01 14:32:09 -0700 | [diff] [blame] | 878 | |
| 879 | /* signal hrtimers about time change */ |
| 880 | clock_was_set(); |
| 881 | } |
| 882 | |
John Stultz | 304529b | 2011-04-01 14:32:09 -0700 | [diff] [blame] | 883 | /** |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 884 | * timekeeping_resume - Resumes the generic timekeeping subsystem. |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 885 | * |
| 886 | * This is for the generic clocksource timekeeping. |
| 887 | * xtime/wall_to_monotonic/jiffies/etc are |
| 888 | * still managed by arch specific suspend/resume code. |
| 889 | */ |
Rafael J. Wysocki | e1a85b2 | 2011-03-23 22:16:04 +0100 | [diff] [blame] | 890 | static void timekeeping_resume(void) |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 891 | { |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 892 | struct timekeeper *tk = &timekeeper; |
Feng Tang | e445cf1 | 2013-03-12 11:56:48 +0800 | [diff] [blame] | 893 | struct clocksource *clock = tk->clock; |
John Stultz | 92c1d3e | 2011-11-14 14:05:44 -0800 | [diff] [blame] | 894 | unsigned long flags; |
Feng Tang | e445cf1 | 2013-03-12 11:56:48 +0800 | [diff] [blame] | 895 | struct timespec ts_new, ts_delta; |
| 896 | cycle_t cycle_now, cycle_delta; |
| 897 | bool suspendtime_found = false; |
Martin Schwidefsky | d4f587c | 2009-08-14 15:47:31 +0200 | [diff] [blame] | 898 | |
Feng Tang | e445cf1 | 2013-03-12 11:56:48 +0800 | [diff] [blame] | 899 | read_persistent_clock(&ts_new); |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 900 | |
Rafael J. Wysocki | adc78e6 | 2012-08-06 01:40:41 +0200 | [diff] [blame] | 901 | clockevents_resume(); |
Thomas Gleixner | d10ff3f | 2007-05-14 11:10:02 +0200 | [diff] [blame] | 902 | clocksource_resume(); |
| 903 | |
Thomas Gleixner | 9a7a71b | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 904 | raw_spin_lock_irqsave(&timekeeper_lock, flags); |
| 905 | write_seqcount_begin(&timekeeper_seq); |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 906 | |
Feng Tang | e445cf1 | 2013-03-12 11:56:48 +0800 | [diff] [blame] | 907 | /* |
| 908 | * After system resumes, we need to calculate the suspended time and |
| 909 | * compensate it for the OS time. There are 3 sources that could be |
| 910 | * used: Nonstop clocksource during suspend, persistent clock and rtc |
| 911 | * device. |
| 912 | * |
| 913 | * One specific platform may have 1 or 2 or all of them, and the |
| 914 | * preference will be: |
| 915 | * suspend-nonstop clocksource -> persistent clock -> rtc |
| 916 | * The less preferred source will only be tried if there is no better |
| 917 | * usable source. The rtc part is handled separately in rtc core code. |
| 918 | */ |
| 919 | cycle_now = clock->read(clock); |
| 920 | if ((clock->flags & CLOCK_SOURCE_SUSPEND_NONSTOP) && |
| 921 | cycle_now > clock->cycle_last) { |
| 922 | u64 num, max = ULLONG_MAX; |
| 923 | u32 mult = clock->mult; |
| 924 | u32 shift = clock->shift; |
| 925 | s64 nsec = 0; |
| 926 | |
| 927 | cycle_delta = (cycle_now - clock->cycle_last) & clock->mask; |
| 928 | |
| 929 | /* |
| 930 | * "cycle_delta * mutl" may cause 64 bits overflow, if the |
| 931 | * suspended time is too long. In that case we need do the |
| 932 | * 64 bits math carefully |
| 933 | */ |
| 934 | do_div(max, mult); |
| 935 | if (cycle_delta > max) { |
| 936 | num = div64_u64(cycle_delta, max); |
| 937 | nsec = (((u64) max * mult) >> shift) * num; |
| 938 | cycle_delta -= num * max; |
| 939 | } |
| 940 | nsec += ((u64) cycle_delta * mult) >> shift; |
| 941 | |
| 942 | ts_delta = ns_to_timespec(nsec); |
| 943 | suspendtime_found = true; |
| 944 | } else if (timespec_compare(&ts_new, &timekeeping_suspend_time) > 0) { |
| 945 | ts_delta = timespec_sub(ts_new, timekeeping_suspend_time); |
| 946 | suspendtime_found = true; |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 947 | } |
Feng Tang | e445cf1 | 2013-03-12 11:56:48 +0800 | [diff] [blame] | 948 | |
| 949 | if (suspendtime_found) |
| 950 | __timekeeping_inject_sleeptime(tk, &ts_delta); |
| 951 | |
| 952 | /* Re-base the last cycle value */ |
| 953 | clock->cycle_last = cycle_now; |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 954 | tk->ntp_error = 0; |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 955 | timekeeping_suspended = 0; |
Thomas Gleixner | 48cdc13 | 2013-02-21 22:51:40 +0000 | [diff] [blame] | 956 | timekeeping_update(tk, false, true); |
Thomas Gleixner | 9a7a71b | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 957 | write_seqcount_end(&timekeeper_seq); |
| 958 | raw_spin_unlock_irqrestore(&timekeeper_lock, flags); |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 959 | |
| 960 | touch_softlockup_watchdog(); |
| 961 | |
| 962 | clockevents_notify(CLOCK_EVT_NOTIFY_RESUME, NULL); |
| 963 | |
| 964 | /* Resume hrtimers */ |
Thomas Gleixner | b12a03c | 2011-05-02 16:48:57 +0200 | [diff] [blame] | 965 | hrtimers_resume(); |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 966 | } |
| 967 | |
Rafael J. Wysocki | e1a85b2 | 2011-03-23 22:16:04 +0100 | [diff] [blame] | 968 | static int timekeeping_suspend(void) |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 969 | { |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 970 | struct timekeeper *tk = &timekeeper; |
John Stultz | 92c1d3e | 2011-11-14 14:05:44 -0800 | [diff] [blame] | 971 | unsigned long flags; |
John Stultz | cb33217 | 2011-05-31 22:53:23 -0700 | [diff] [blame] | 972 | struct timespec delta, delta_delta; |
| 973 | static struct timespec old_delta; |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 974 | |
Martin Schwidefsky | d4f587c | 2009-08-14 15:47:31 +0200 | [diff] [blame] | 975 | read_persistent_clock(&timekeeping_suspend_time); |
Thomas Gleixner | 3be9095 | 2007-09-16 15:36:43 +0200 | [diff] [blame] | 976 | |
Thomas Gleixner | 9a7a71b | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 977 | raw_spin_lock_irqsave(&timekeeper_lock, flags); |
| 978 | write_seqcount_begin(&timekeeper_seq); |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 979 | timekeeping_forward_now(tk); |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 980 | timekeeping_suspended = 1; |
John Stultz | cb33217 | 2011-05-31 22:53:23 -0700 | [diff] [blame] | 981 | |
| 982 | /* |
| 983 | * To avoid drift caused by repeated suspend/resumes, |
| 984 | * which each can add ~1 second drift error, |
| 985 | * try to compensate so the difference in system time |
| 986 | * and persistent_clock time stays close to constant. |
| 987 | */ |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 988 | delta = timespec_sub(tk_xtime(tk), timekeeping_suspend_time); |
John Stultz | cb33217 | 2011-05-31 22:53:23 -0700 | [diff] [blame] | 989 | delta_delta = timespec_sub(delta, old_delta); |
| 990 | if (abs(delta_delta.tv_sec) >= 2) { |
| 991 | /* |
| 992 | * if delta_delta is too large, assume time correction |
| 993 | * has occured and set old_delta to the current delta. |
| 994 | */ |
| 995 | old_delta = delta; |
| 996 | } else { |
| 997 | /* Otherwise try to adjust old_system to compensate */ |
| 998 | timekeeping_suspend_time = |
| 999 | timespec_add(timekeeping_suspend_time, delta_delta); |
| 1000 | } |
Thomas Gleixner | 9a7a71b | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 1001 | write_seqcount_end(&timekeeper_seq); |
| 1002 | raw_spin_unlock_irqrestore(&timekeeper_lock, flags); |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 1003 | |
| 1004 | clockevents_notify(CLOCK_EVT_NOTIFY_SUSPEND, NULL); |
Magnus Damm | c54a42b | 2010-02-02 14:41:41 -0800 | [diff] [blame] | 1005 | clocksource_suspend(); |
Rafael J. Wysocki | adc78e6 | 2012-08-06 01:40:41 +0200 | [diff] [blame] | 1006 | clockevents_suspend(); |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 1007 | |
| 1008 | return 0; |
| 1009 | } |
| 1010 | |
| 1011 | /* sysfs resume/suspend bits for timekeeping */ |
Rafael J. Wysocki | e1a85b2 | 2011-03-23 22:16:04 +0100 | [diff] [blame] | 1012 | static struct syscore_ops timekeeping_syscore_ops = { |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 1013 | .resume = timekeeping_resume, |
| 1014 | .suspend = timekeeping_suspend, |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 1015 | }; |
| 1016 | |
Rafael J. Wysocki | e1a85b2 | 2011-03-23 22:16:04 +0100 | [diff] [blame] | 1017 | static int __init timekeeping_init_ops(void) |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 1018 | { |
Rafael J. Wysocki | e1a85b2 | 2011-03-23 22:16:04 +0100 | [diff] [blame] | 1019 | register_syscore_ops(&timekeeping_syscore_ops); |
| 1020 | return 0; |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 1021 | } |
| 1022 | |
Rafael J. Wysocki | e1a85b2 | 2011-03-23 22:16:04 +0100 | [diff] [blame] | 1023 | device_initcall(timekeeping_init_ops); |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 1024 | |
| 1025 | /* |
| 1026 | * If the error is already larger, we look ahead even further |
| 1027 | * to compensate for late or lost adjustments. |
| 1028 | */ |
John Stultz | f726a69 | 2012-07-13 01:21:57 -0400 | [diff] [blame] | 1029 | static __always_inline int timekeeping_bigadjust(struct timekeeper *tk, |
| 1030 | s64 error, s64 *interval, |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 1031 | s64 *offset) |
| 1032 | { |
| 1033 | s64 tick_error, i; |
| 1034 | u32 look_ahead, adj; |
| 1035 | s32 error2, mult; |
| 1036 | |
| 1037 | /* |
| 1038 | * Use the current error value to determine how much to look ahead. |
| 1039 | * The larger the error the slower we adjust for it to avoid problems |
| 1040 | * with losing too many ticks, otherwise we would overadjust and |
| 1041 | * produce an even larger error. The smaller the adjustment the |
| 1042 | * faster we try to adjust for it, as lost ticks can do less harm |
Li Zefan | 3eb0567 | 2008-02-08 04:19:25 -0800 | [diff] [blame] | 1043 | * here. This is tuned so that an error of about 1 msec is adjusted |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 1044 | * within about 1 sec (or 2^20 nsec in 2^SHIFT_HZ ticks). |
| 1045 | */ |
John Stultz | f726a69 | 2012-07-13 01:21:57 -0400 | [diff] [blame] | 1046 | error2 = tk->ntp_error >> (NTP_SCALE_SHIFT + 22 - 2 * SHIFT_HZ); |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 1047 | error2 = abs(error2); |
| 1048 | for (look_ahead = 0; error2 > 0; look_ahead++) |
| 1049 | error2 >>= 2; |
| 1050 | |
| 1051 | /* |
| 1052 | * Now calculate the error in (1 << look_ahead) ticks, but first |
| 1053 | * remove the single look ahead already included in the error. |
| 1054 | */ |
John Stultz | f726a69 | 2012-07-13 01:21:57 -0400 | [diff] [blame] | 1055 | tick_error = ntp_tick_length() >> (tk->ntp_error_shift + 1); |
| 1056 | tick_error -= tk->xtime_interval >> 1; |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 1057 | error = ((error - tick_error) >> look_ahead) + tick_error; |
| 1058 | |
| 1059 | /* Finally calculate the adjustment shift value. */ |
| 1060 | i = *interval; |
| 1061 | mult = 1; |
| 1062 | if (error < 0) { |
| 1063 | error = -error; |
| 1064 | *interval = -*interval; |
| 1065 | *offset = -*offset; |
| 1066 | mult = -1; |
| 1067 | } |
| 1068 | for (adj = 0; error > i; adj++) |
| 1069 | error >>= 1; |
| 1070 | |
| 1071 | *interval <<= adj; |
| 1072 | *offset <<= adj; |
| 1073 | return mult << adj; |
| 1074 | } |
| 1075 | |
| 1076 | /* |
| 1077 | * Adjust the multiplier to reduce the error value, |
| 1078 | * this is optimized for the most common adjustments of -1,0,1, |
| 1079 | * for other values we can do a bit more work. |
| 1080 | */ |
John Stultz | f726a69 | 2012-07-13 01:21:57 -0400 | [diff] [blame] | 1081 | static void timekeeping_adjust(struct timekeeper *tk, s64 offset) |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 1082 | { |
John Stultz | f726a69 | 2012-07-13 01:21:57 -0400 | [diff] [blame] | 1083 | s64 error, interval = tk->cycle_interval; |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 1084 | int adj; |
| 1085 | |
John Stultz | c2bc111 | 2011-10-27 18:12:42 -0700 | [diff] [blame] | 1086 | /* |
Jim Cromie | 88b28ad | 2012-03-14 21:28:56 -0600 | [diff] [blame] | 1087 | * The point of this is to check if the error is greater than half |
John Stultz | c2bc111 | 2011-10-27 18:12:42 -0700 | [diff] [blame] | 1088 | * an interval. |
| 1089 | * |
| 1090 | * First we shift it down from NTP_SHIFT to clocksource->shifted nsecs. |
| 1091 | * |
| 1092 | * Note we subtract one in the shift, so that error is really error*2. |
John Stultz | 3f86f28 | 2011-10-27 17:41:17 -0700 | [diff] [blame] | 1093 | * This "saves" dividing(shifting) interval twice, but keeps the |
| 1094 | * (error > interval) comparison as still measuring if error is |
Jim Cromie | 88b28ad | 2012-03-14 21:28:56 -0600 | [diff] [blame] | 1095 | * larger than half an interval. |
John Stultz | c2bc111 | 2011-10-27 18:12:42 -0700 | [diff] [blame] | 1096 | * |
John Stultz | 3f86f28 | 2011-10-27 17:41:17 -0700 | [diff] [blame] | 1097 | * Note: It does not "save" on aggravation when reading the code. |
John Stultz | c2bc111 | 2011-10-27 18:12:42 -0700 | [diff] [blame] | 1098 | */ |
John Stultz | f726a69 | 2012-07-13 01:21:57 -0400 | [diff] [blame] | 1099 | error = tk->ntp_error >> (tk->ntp_error_shift - 1); |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 1100 | if (error > interval) { |
John Stultz | c2bc111 | 2011-10-27 18:12:42 -0700 | [diff] [blame] | 1101 | /* |
| 1102 | * We now divide error by 4(via shift), which checks if |
Jim Cromie | 88b28ad | 2012-03-14 21:28:56 -0600 | [diff] [blame] | 1103 | * the error is greater than twice the interval. |
John Stultz | c2bc111 | 2011-10-27 18:12:42 -0700 | [diff] [blame] | 1104 | * If it is greater, we need a bigadjust, if its smaller, |
| 1105 | * we can adjust by 1. |
| 1106 | */ |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 1107 | error >>= 2; |
John Stultz | c2bc111 | 2011-10-27 18:12:42 -0700 | [diff] [blame] | 1108 | /* |
| 1109 | * XXX - In update_wall_time, we round up to the next |
| 1110 | * nanosecond, and store the amount rounded up into |
| 1111 | * the error. This causes the likely below to be unlikely. |
| 1112 | * |
John Stultz | 3f86f28 | 2011-10-27 17:41:17 -0700 | [diff] [blame] | 1113 | * The proper fix is to avoid rounding up by using |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 1114 | * the high precision tk->xtime_nsec instead of |
John Stultz | c2bc111 | 2011-10-27 18:12:42 -0700 | [diff] [blame] | 1115 | * xtime.tv_nsec everywhere. Fixing this will take some |
| 1116 | * time. |
| 1117 | */ |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 1118 | if (likely(error <= interval)) |
| 1119 | adj = 1; |
| 1120 | else |
Ingo Molnar | 1d17d17 | 2012-08-04 21:21:14 +0200 | [diff] [blame] | 1121 | adj = timekeeping_bigadjust(tk, error, &interval, &offset); |
| 1122 | } else { |
| 1123 | if (error < -interval) { |
| 1124 | /* See comment above, this is just switched for the negative */ |
| 1125 | error >>= 2; |
| 1126 | if (likely(error >= -interval)) { |
| 1127 | adj = -1; |
| 1128 | interval = -interval; |
| 1129 | offset = -offset; |
| 1130 | } else { |
| 1131 | adj = timekeeping_bigadjust(tk, error, &interval, &offset); |
| 1132 | } |
| 1133 | } else { |
| 1134 | goto out_adjust; |
| 1135 | } |
| 1136 | } |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 1137 | |
John Stultz | f726a69 | 2012-07-13 01:21:57 -0400 | [diff] [blame] | 1138 | if (unlikely(tk->clock->maxadj && |
| 1139 | (tk->mult + adj > tk->clock->mult + tk->clock->maxadj))) { |
John Stultz | e919cfd | 2012-03-22 19:14:46 -0700 | [diff] [blame] | 1140 | printk_once(KERN_WARNING |
| 1141 | "Adjusting %s more than 11%% (%ld vs %ld)\n", |
John Stultz | f726a69 | 2012-07-13 01:21:57 -0400 | [diff] [blame] | 1142 | tk->clock->name, (long)tk->mult + adj, |
| 1143 | (long)tk->clock->mult + tk->clock->maxadj); |
John Stultz | e919cfd | 2012-03-22 19:14:46 -0700 | [diff] [blame] | 1144 | } |
John Stultz | c2bc111 | 2011-10-27 18:12:42 -0700 | [diff] [blame] | 1145 | /* |
| 1146 | * So the following can be confusing. |
| 1147 | * |
| 1148 | * To keep things simple, lets assume adj == 1 for now. |
| 1149 | * |
| 1150 | * When adj != 1, remember that the interval and offset values |
| 1151 | * have been appropriately scaled so the math is the same. |
| 1152 | * |
| 1153 | * The basic idea here is that we're increasing the multiplier |
| 1154 | * by one, this causes the xtime_interval to be incremented by |
| 1155 | * one cycle_interval. This is because: |
| 1156 | * xtime_interval = cycle_interval * mult |
| 1157 | * So if mult is being incremented by one: |
| 1158 | * xtime_interval = cycle_interval * (mult + 1) |
| 1159 | * Its the same as: |
| 1160 | * xtime_interval = (cycle_interval * mult) + cycle_interval |
| 1161 | * Which can be shortened to: |
| 1162 | * xtime_interval += cycle_interval |
| 1163 | * |
| 1164 | * So offset stores the non-accumulated cycles. Thus the current |
| 1165 | * time (in shifted nanoseconds) is: |
| 1166 | * now = (offset * adj) + xtime_nsec |
| 1167 | * Now, even though we're adjusting the clock frequency, we have |
| 1168 | * to keep time consistent. In other words, we can't jump back |
| 1169 | * in time, and we also want to avoid jumping forward in time. |
| 1170 | * |
| 1171 | * So given the same offset value, we need the time to be the same |
| 1172 | * both before and after the freq adjustment. |
| 1173 | * now = (offset * adj_1) + xtime_nsec_1 |
| 1174 | * now = (offset * adj_2) + xtime_nsec_2 |
| 1175 | * So: |
| 1176 | * (offset * adj_1) + xtime_nsec_1 = |
| 1177 | * (offset * adj_2) + xtime_nsec_2 |
| 1178 | * And we know: |
| 1179 | * adj_2 = adj_1 + 1 |
| 1180 | * So: |
| 1181 | * (offset * adj_1) + xtime_nsec_1 = |
| 1182 | * (offset * (adj_1+1)) + xtime_nsec_2 |
| 1183 | * (offset * adj_1) + xtime_nsec_1 = |
| 1184 | * (offset * adj_1) + offset + xtime_nsec_2 |
| 1185 | * Canceling the sides: |
| 1186 | * xtime_nsec_1 = offset + xtime_nsec_2 |
| 1187 | * Which gives us: |
| 1188 | * xtime_nsec_2 = xtime_nsec_1 - offset |
| 1189 | * Which simplfies to: |
| 1190 | * xtime_nsec -= offset |
| 1191 | * |
| 1192 | * XXX - TODO: Doc ntp_error calculation. |
| 1193 | */ |
John Stultz | f726a69 | 2012-07-13 01:21:57 -0400 | [diff] [blame] | 1194 | tk->mult += adj; |
| 1195 | tk->xtime_interval += interval; |
| 1196 | tk->xtime_nsec -= offset; |
| 1197 | tk->ntp_error -= (interval - offset) << tk->ntp_error_shift; |
John Stultz | 2a8c088 | 2012-07-13 01:21:56 -0400 | [diff] [blame] | 1198 | |
Ingo Molnar | 1d17d17 | 2012-08-04 21:21:14 +0200 | [diff] [blame] | 1199 | out_adjust: |
John Stultz | 2a8c088 | 2012-07-13 01:21:56 -0400 | [diff] [blame] | 1200 | /* |
| 1201 | * It may be possible that when we entered this function, xtime_nsec |
| 1202 | * was very small. Further, if we're slightly speeding the clocksource |
| 1203 | * in the code above, its possible the required corrective factor to |
| 1204 | * xtime_nsec could cause it to underflow. |
| 1205 | * |
| 1206 | * Now, since we already accumulated the second, cannot simply roll |
| 1207 | * the accumulated second back, since the NTP subsystem has been |
| 1208 | * notified via second_overflow. So instead we push xtime_nsec forward |
| 1209 | * by the amount we underflowed, and add that amount into the error. |
| 1210 | * |
| 1211 | * We'll correct this error next time through this function, when |
| 1212 | * xtime_nsec is not as small. |
| 1213 | */ |
John Stultz | f726a69 | 2012-07-13 01:21:57 -0400 | [diff] [blame] | 1214 | if (unlikely((s64)tk->xtime_nsec < 0)) { |
| 1215 | s64 neg = -(s64)tk->xtime_nsec; |
| 1216 | tk->xtime_nsec = 0; |
| 1217 | tk->ntp_error += neg << tk->ntp_error_shift; |
John Stultz | 2a8c088 | 2012-07-13 01:21:56 -0400 | [diff] [blame] | 1218 | } |
| 1219 | |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 1220 | } |
| 1221 | |
| 1222 | /** |
John Stultz | 1f4f948 | 2012-07-13 01:21:54 -0400 | [diff] [blame] | 1223 | * accumulate_nsecs_to_secs - Accumulates nsecs into secs |
| 1224 | * |
| 1225 | * Helper function that accumulates a the nsecs greater then a second |
| 1226 | * from the xtime_nsec field to the xtime_secs field. |
| 1227 | * It also calls into the NTP code to handle leapsecond processing. |
| 1228 | * |
| 1229 | */ |
| 1230 | static inline void accumulate_nsecs_to_secs(struct timekeeper *tk) |
| 1231 | { |
| 1232 | u64 nsecps = (u64)NSEC_PER_SEC << tk->shift; |
| 1233 | |
| 1234 | while (tk->xtime_nsec >= nsecps) { |
| 1235 | int leap; |
| 1236 | |
| 1237 | tk->xtime_nsec -= nsecps; |
| 1238 | tk->xtime_sec++; |
| 1239 | |
| 1240 | /* Figure out if its a leap sec and apply if needed */ |
| 1241 | leap = second_overflow(tk->xtime_sec); |
John Stultz | 6d0ef90 | 2012-07-27 14:48:12 -0400 | [diff] [blame] | 1242 | if (unlikely(leap)) { |
| 1243 | struct timespec ts; |
John Stultz | 1f4f948 | 2012-07-13 01:21:54 -0400 | [diff] [blame] | 1244 | |
John Stultz | 6d0ef90 | 2012-07-27 14:48:12 -0400 | [diff] [blame] | 1245 | tk->xtime_sec += leap; |
| 1246 | |
| 1247 | ts.tv_sec = leap; |
| 1248 | ts.tv_nsec = 0; |
| 1249 | tk_set_wall_to_mono(tk, |
| 1250 | timespec_sub(tk->wall_to_monotonic, ts)); |
| 1251 | |
John Stultz | cc244dd | 2012-05-03 12:30:07 -0700 | [diff] [blame] | 1252 | __timekeeping_set_tai_offset(tk, tk->tai_offset - leap); |
| 1253 | |
John Stultz | 6d0ef90 | 2012-07-27 14:48:12 -0400 | [diff] [blame] | 1254 | clock_was_set_delayed(); |
| 1255 | } |
John Stultz | 1f4f948 | 2012-07-13 01:21:54 -0400 | [diff] [blame] | 1256 | } |
| 1257 | } |
| 1258 | |
John Stultz | 1f4f948 | 2012-07-13 01:21:54 -0400 | [diff] [blame] | 1259 | /** |
john stultz | a092ff0 | 2009-10-02 16:17:53 -0700 | [diff] [blame] | 1260 | * logarithmic_accumulation - shifted accumulation of cycles |
| 1261 | * |
| 1262 | * This functions accumulates a shifted interval of cycles into |
| 1263 | * into a shifted interval nanoseconds. Allows for O(log) accumulation |
| 1264 | * loop. |
| 1265 | * |
| 1266 | * Returns the unconsumed cycles. |
| 1267 | */ |
John Stultz | f726a69 | 2012-07-13 01:21:57 -0400 | [diff] [blame] | 1268 | static cycle_t logarithmic_accumulation(struct timekeeper *tk, cycle_t offset, |
| 1269 | u32 shift) |
john stultz | a092ff0 | 2009-10-02 16:17:53 -0700 | [diff] [blame] | 1270 | { |
Thomas Gleixner | 23a9537 | 2013-02-21 22:51:36 +0000 | [diff] [blame] | 1271 | cycle_t interval = tk->cycle_interval << shift; |
Jason Wessel | deda2e8 | 2010-08-09 14:20:09 -0700 | [diff] [blame] | 1272 | u64 raw_nsecs; |
john stultz | a092ff0 | 2009-10-02 16:17:53 -0700 | [diff] [blame] | 1273 | |
John Stultz | f726a69 | 2012-07-13 01:21:57 -0400 | [diff] [blame] | 1274 | /* If the offset is smaller then a shifted interval, do nothing */ |
Thomas Gleixner | 23a9537 | 2013-02-21 22:51:36 +0000 | [diff] [blame] | 1275 | if (offset < interval) |
john stultz | a092ff0 | 2009-10-02 16:17:53 -0700 | [diff] [blame] | 1276 | return offset; |
| 1277 | |
| 1278 | /* Accumulate one shifted interval */ |
Thomas Gleixner | 23a9537 | 2013-02-21 22:51:36 +0000 | [diff] [blame] | 1279 | offset -= interval; |
Thomas Gleixner | 7ec98e1 | 2013-02-21 22:51:39 +0000 | [diff] [blame] | 1280 | tk->cycle_last += interval; |
john stultz | a092ff0 | 2009-10-02 16:17:53 -0700 | [diff] [blame] | 1281 | |
John Stultz | f726a69 | 2012-07-13 01:21:57 -0400 | [diff] [blame] | 1282 | tk->xtime_nsec += tk->xtime_interval << shift; |
| 1283 | accumulate_nsecs_to_secs(tk); |
john stultz | a092ff0 | 2009-10-02 16:17:53 -0700 | [diff] [blame] | 1284 | |
Jason Wessel | deda2e8 | 2010-08-09 14:20:09 -0700 | [diff] [blame] | 1285 | /* Accumulate raw time */ |
Dan Carpenter | 5b3900c | 2012-10-09 10:18:23 +0300 | [diff] [blame] | 1286 | raw_nsecs = (u64)tk->raw_interval << shift; |
John Stultz | f726a69 | 2012-07-13 01:21:57 -0400 | [diff] [blame] | 1287 | raw_nsecs += tk->raw_time.tv_nsec; |
John Stultz | c7dcf87 | 2010-08-13 11:30:58 -0700 | [diff] [blame] | 1288 | if (raw_nsecs >= NSEC_PER_SEC) { |
| 1289 | u64 raw_secs = raw_nsecs; |
| 1290 | raw_nsecs = do_div(raw_secs, NSEC_PER_SEC); |
John Stultz | f726a69 | 2012-07-13 01:21:57 -0400 | [diff] [blame] | 1291 | tk->raw_time.tv_sec += raw_secs; |
john stultz | a092ff0 | 2009-10-02 16:17:53 -0700 | [diff] [blame] | 1292 | } |
John Stultz | f726a69 | 2012-07-13 01:21:57 -0400 | [diff] [blame] | 1293 | tk->raw_time.tv_nsec = raw_nsecs; |
john stultz | a092ff0 | 2009-10-02 16:17:53 -0700 | [diff] [blame] | 1294 | |
| 1295 | /* Accumulate error between NTP and clock interval */ |
John Stultz | f726a69 | 2012-07-13 01:21:57 -0400 | [diff] [blame] | 1296 | tk->ntp_error += ntp_tick_length() << shift; |
| 1297 | tk->ntp_error -= (tk->xtime_interval + tk->xtime_remainder) << |
| 1298 | (tk->ntp_error_shift + shift); |
john stultz | a092ff0 | 2009-10-02 16:17:53 -0700 | [diff] [blame] | 1299 | |
| 1300 | return offset; |
| 1301 | } |
| 1302 | |
John Stultz | 92bb1fc | 2012-09-04 15:38:12 -0400 | [diff] [blame] | 1303 | #ifdef CONFIG_GENERIC_TIME_VSYSCALL_OLD |
| 1304 | static inline void old_vsyscall_fixup(struct timekeeper *tk) |
| 1305 | { |
| 1306 | s64 remainder; |
| 1307 | |
| 1308 | /* |
| 1309 | * Store only full nanoseconds into xtime_nsec after rounding |
| 1310 | * it up and add the remainder to the error difference. |
| 1311 | * XXX - This is necessary to avoid small 1ns inconsistnecies caused |
| 1312 | * by truncating the remainder in vsyscalls. However, it causes |
| 1313 | * additional work to be done in timekeeping_adjust(). Once |
| 1314 | * the vsyscall implementations are converted to use xtime_nsec |
| 1315 | * (shifted nanoseconds), and CONFIG_GENERIC_TIME_VSYSCALL_OLD |
| 1316 | * users are removed, this can be killed. |
| 1317 | */ |
| 1318 | remainder = tk->xtime_nsec & ((1ULL << tk->shift) - 1); |
| 1319 | tk->xtime_nsec -= remainder; |
| 1320 | tk->xtime_nsec += 1ULL << tk->shift; |
| 1321 | tk->ntp_error += remainder << tk->ntp_error_shift; |
| 1322 | |
| 1323 | } |
| 1324 | #else |
| 1325 | #define old_vsyscall_fixup(tk) |
| 1326 | #endif |
| 1327 | |
| 1328 | |
| 1329 | |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 1330 | /** |
| 1331 | * update_wall_time - Uses the current clocksource to increment the wall time |
| 1332 | * |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 1333 | */ |
Torben Hohn | 871cf1e | 2011-01-27 15:58:55 +0100 | [diff] [blame] | 1334 | static void update_wall_time(void) |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 1335 | { |
Martin Schwidefsky | 155ec60 | 2009-08-14 15:47:26 +0200 | [diff] [blame] | 1336 | struct clocksource *clock; |
Thomas Gleixner | 48cdc13 | 2013-02-21 22:51:40 +0000 | [diff] [blame] | 1337 | struct timekeeper *real_tk = &timekeeper; |
| 1338 | struct timekeeper *tk = &shadow_timekeeper; |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 1339 | cycle_t offset; |
john stultz | a092ff0 | 2009-10-02 16:17:53 -0700 | [diff] [blame] | 1340 | int shift = 0, maxshift; |
John Stultz | 70471f2 | 2011-11-14 12:48:10 -0800 | [diff] [blame] | 1341 | unsigned long flags; |
| 1342 | |
Thomas Gleixner | 9a7a71b | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 1343 | raw_spin_lock_irqsave(&timekeeper_lock, flags); |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 1344 | |
| 1345 | /* Make sure we're fully resumed: */ |
| 1346 | if (unlikely(timekeeping_suspended)) |
John Stultz | 70471f2 | 2011-11-14 12:48:10 -0800 | [diff] [blame] | 1347 | goto out; |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 1348 | |
Thomas Gleixner | 48cdc13 | 2013-02-21 22:51:40 +0000 | [diff] [blame] | 1349 | clock = real_tk->clock; |
John Stultz | 592913e | 2010-07-13 17:56:20 -0700 | [diff] [blame] | 1350 | |
| 1351 | #ifdef CONFIG_ARCH_USES_GETTIMEOFFSET |
Thomas Gleixner | 48cdc13 | 2013-02-21 22:51:40 +0000 | [diff] [blame] | 1352 | offset = real_tk->cycle_interval; |
John Stultz | 592913e | 2010-07-13 17:56:20 -0700 | [diff] [blame] | 1353 | #else |
| 1354 | offset = (clock->read(clock) - clock->cycle_last) & clock->mask; |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 1355 | #endif |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 1356 | |
John Stultz | bf2ac31 | 2012-08-21 20:30:49 -0400 | [diff] [blame] | 1357 | /* Check if there's really nothing to do */ |
Thomas Gleixner | 48cdc13 | 2013-02-21 22:51:40 +0000 | [diff] [blame] | 1358 | if (offset < real_tk->cycle_interval) |
John Stultz | bf2ac31 | 2012-08-21 20:30:49 -0400 | [diff] [blame] | 1359 | goto out; |
| 1360 | |
john stultz | a092ff0 | 2009-10-02 16:17:53 -0700 | [diff] [blame] | 1361 | /* |
| 1362 | * With NO_HZ we may have to accumulate many cycle_intervals |
| 1363 | * (think "ticks") worth of time at once. To do this efficiently, |
| 1364 | * we calculate the largest doubling multiple of cycle_intervals |
Jim Cromie | 88b28ad | 2012-03-14 21:28:56 -0600 | [diff] [blame] | 1365 | * that is smaller than the offset. We then accumulate that |
john stultz | a092ff0 | 2009-10-02 16:17:53 -0700 | [diff] [blame] | 1366 | * chunk in one go, and then try to consume the next smaller |
| 1367 | * doubled multiple. |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 1368 | */ |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 1369 | shift = ilog2(offset) - ilog2(tk->cycle_interval); |
john stultz | a092ff0 | 2009-10-02 16:17:53 -0700 | [diff] [blame] | 1370 | shift = max(0, shift); |
Jim Cromie | 88b28ad | 2012-03-14 21:28:56 -0600 | [diff] [blame] | 1371 | /* Bound shift to one less than what overflows tick_length */ |
John Stultz | ea7cf49 | 2011-11-14 13:18:07 -0800 | [diff] [blame] | 1372 | maxshift = (64 - (ilog2(ntp_tick_length())+1)) - 1; |
john stultz | a092ff0 | 2009-10-02 16:17:53 -0700 | [diff] [blame] | 1373 | shift = min(shift, maxshift); |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 1374 | while (offset >= tk->cycle_interval) { |
| 1375 | offset = logarithmic_accumulation(tk, offset, shift); |
| 1376 | if (offset < tk->cycle_interval<<shift) |
John Stultz | 830ec04 | 2010-03-18 14:47:30 -0700 | [diff] [blame] | 1377 | shift--; |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 1378 | } |
| 1379 | |
| 1380 | /* correct the clock when NTP error is too big */ |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 1381 | timekeeping_adjust(tk, offset); |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 1382 | |
John Stultz | 6a867a3 | 2010-04-06 14:30:51 -0700 | [diff] [blame] | 1383 | /* |
John Stultz | 92bb1fc | 2012-09-04 15:38:12 -0400 | [diff] [blame] | 1384 | * XXX This can be killed once everyone converts |
| 1385 | * to the new update_vsyscall. |
| 1386 | */ |
| 1387 | old_vsyscall_fixup(tk); |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 1388 | |
John Stultz | 6a867a3 | 2010-04-06 14:30:51 -0700 | [diff] [blame] | 1389 | /* |
| 1390 | * Finally, make sure that after the rounding |
John Stultz | 1e75fa8 | 2012-07-13 01:21:53 -0400 | [diff] [blame] | 1391 | * xtime_nsec isn't larger than NSEC_PER_SEC |
John Stultz | 6a867a3 | 2010-04-06 14:30:51 -0700 | [diff] [blame] | 1392 | */ |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 1393 | accumulate_nsecs_to_secs(tk); |
Linus Torvalds | 83f57a1 | 2009-12-22 14:10:37 -0800 | [diff] [blame] | 1394 | |
Thomas Gleixner | ca4523c | 2013-02-21 22:51:40 +0000 | [diff] [blame^] | 1395 | write_seqcount_begin(&timekeeper_seq); |
Thomas Gleixner | 7ec98e1 | 2013-02-21 22:51:39 +0000 | [diff] [blame] | 1396 | /* Update clock->cycle_last with the new value */ |
| 1397 | clock->cycle_last = tk->cycle_last; |
Thomas Gleixner | 48cdc13 | 2013-02-21 22:51:40 +0000 | [diff] [blame] | 1398 | /* |
| 1399 | * Update the real timekeeper. |
| 1400 | * |
| 1401 | * We could avoid this memcpy by switching pointers, but that |
| 1402 | * requires changes to all other timekeeper usage sites as |
| 1403 | * well, i.e. move the timekeeper pointer getter into the |
| 1404 | * spinlocked/seqcount protected sections. And we trade this |
| 1405 | * memcpy under the timekeeper_seq against one before we start |
| 1406 | * updating. |
| 1407 | */ |
| 1408 | memcpy(real_tk, tk, sizeof(*tk)); |
| 1409 | timekeeping_update(real_tk, false, false); |
Thomas Gleixner | 9a7a71b | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 1410 | write_seqcount_end(&timekeeper_seq); |
Thomas Gleixner | ca4523c | 2013-02-21 22:51:40 +0000 | [diff] [blame^] | 1411 | out: |
Thomas Gleixner | 9a7a71b | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 1412 | raw_spin_unlock_irqrestore(&timekeeper_lock, flags); |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 1413 | } |
Tomas Janousek | 7c3f1a5 | 2007-07-15 23:39:41 -0700 | [diff] [blame] | 1414 | |
| 1415 | /** |
| 1416 | * getboottime - Return the real time of system boot. |
| 1417 | * @ts: pointer to the timespec to be set |
| 1418 | * |
John Stultz | abb3a4e | 2011-02-14 17:52:09 -0800 | [diff] [blame] | 1419 | * Returns the wall-time of boot in a timespec. |
Tomas Janousek | 7c3f1a5 | 2007-07-15 23:39:41 -0700 | [diff] [blame] | 1420 | * |
| 1421 | * This is based on the wall_to_monotonic offset and the total suspend |
| 1422 | * time. Calls to settimeofday will affect the value returned (which |
| 1423 | * basically means that however wrong your real time clock is at boot time, |
| 1424 | * you get the right time here). |
| 1425 | */ |
| 1426 | void getboottime(struct timespec *ts) |
| 1427 | { |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 1428 | struct timekeeper *tk = &timekeeper; |
Hiroshi Shimamoto | 36d4748 | 2009-08-25 15:08:30 +0900 | [diff] [blame] | 1429 | struct timespec boottime = { |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 1430 | .tv_sec = tk->wall_to_monotonic.tv_sec + |
| 1431 | tk->total_sleep_time.tv_sec, |
| 1432 | .tv_nsec = tk->wall_to_monotonic.tv_nsec + |
| 1433 | tk->total_sleep_time.tv_nsec |
Hiroshi Shimamoto | 36d4748 | 2009-08-25 15:08:30 +0900 | [diff] [blame] | 1434 | }; |
Martin Schwidefsky | d4f587c | 2009-08-14 15:47:31 +0200 | [diff] [blame] | 1435 | |
Martin Schwidefsky | d4f587c | 2009-08-14 15:47:31 +0200 | [diff] [blame] | 1436 | set_normalized_timespec(ts, -boottime.tv_sec, -boottime.tv_nsec); |
Tomas Janousek | 7c3f1a5 | 2007-07-15 23:39:41 -0700 | [diff] [blame] | 1437 | } |
Jason Wang | c93d89f | 2010-01-27 19:13:40 +0800 | [diff] [blame] | 1438 | EXPORT_SYMBOL_GPL(getboottime); |
Tomas Janousek | 7c3f1a5 | 2007-07-15 23:39:41 -0700 | [diff] [blame] | 1439 | |
John Stultz | abb3a4e | 2011-02-14 17:52:09 -0800 | [diff] [blame] | 1440 | /** |
| 1441 | * get_monotonic_boottime - Returns monotonic time since boot |
| 1442 | * @ts: pointer to the timespec to be set |
| 1443 | * |
| 1444 | * Returns the monotonic time since boot in a timespec. |
| 1445 | * |
| 1446 | * This is similar to CLOCK_MONTONIC/ktime_get_ts, but also |
| 1447 | * includes the time spent in suspend. |
| 1448 | */ |
| 1449 | void get_monotonic_boottime(struct timespec *ts) |
| 1450 | { |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 1451 | struct timekeeper *tk = &timekeeper; |
John Stultz | abb3a4e | 2011-02-14 17:52:09 -0800 | [diff] [blame] | 1452 | struct timespec tomono, sleep; |
John Stultz | ec145ba | 2012-09-11 19:26:03 -0400 | [diff] [blame] | 1453 | s64 nsec; |
John Stultz | abb3a4e | 2011-02-14 17:52:09 -0800 | [diff] [blame] | 1454 | unsigned int seq; |
John Stultz | abb3a4e | 2011-02-14 17:52:09 -0800 | [diff] [blame] | 1455 | |
| 1456 | WARN_ON(timekeeping_suspended); |
| 1457 | |
| 1458 | do { |
Thomas Gleixner | 9a7a71b | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 1459 | seq = read_seqcount_begin(&timekeeper_seq); |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 1460 | ts->tv_sec = tk->xtime_sec; |
John Stultz | ec145ba | 2012-09-11 19:26:03 -0400 | [diff] [blame] | 1461 | nsec = timekeeping_get_ns(tk); |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 1462 | tomono = tk->wall_to_monotonic; |
| 1463 | sleep = tk->total_sleep_time; |
John Stultz | abb3a4e | 2011-02-14 17:52:09 -0800 | [diff] [blame] | 1464 | |
Thomas Gleixner | 9a7a71b | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 1465 | } while (read_seqcount_retry(&timekeeper_seq, seq)); |
John Stultz | abb3a4e | 2011-02-14 17:52:09 -0800 | [diff] [blame] | 1466 | |
John Stultz | ec145ba | 2012-09-11 19:26:03 -0400 | [diff] [blame] | 1467 | ts->tv_sec += tomono.tv_sec + sleep.tv_sec; |
| 1468 | ts->tv_nsec = 0; |
| 1469 | timespec_add_ns(ts, nsec + tomono.tv_nsec + sleep.tv_nsec); |
John Stultz | abb3a4e | 2011-02-14 17:52:09 -0800 | [diff] [blame] | 1470 | } |
| 1471 | EXPORT_SYMBOL_GPL(get_monotonic_boottime); |
| 1472 | |
| 1473 | /** |
| 1474 | * ktime_get_boottime - Returns monotonic time since boot in a ktime |
| 1475 | * |
| 1476 | * Returns the monotonic time since boot in a ktime |
| 1477 | * |
| 1478 | * This is similar to CLOCK_MONTONIC/ktime_get, but also |
| 1479 | * includes the time spent in suspend. |
| 1480 | */ |
| 1481 | ktime_t ktime_get_boottime(void) |
| 1482 | { |
| 1483 | struct timespec ts; |
| 1484 | |
| 1485 | get_monotonic_boottime(&ts); |
| 1486 | return timespec_to_ktime(ts); |
| 1487 | } |
| 1488 | EXPORT_SYMBOL_GPL(ktime_get_boottime); |
| 1489 | |
Tomas Janousek | 7c3f1a5 | 2007-07-15 23:39:41 -0700 | [diff] [blame] | 1490 | /** |
| 1491 | * monotonic_to_bootbased - Convert the monotonic time to boot based. |
| 1492 | * @ts: pointer to the timespec to be converted |
| 1493 | */ |
| 1494 | void monotonic_to_bootbased(struct timespec *ts) |
| 1495 | { |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 1496 | struct timekeeper *tk = &timekeeper; |
| 1497 | |
| 1498 | *ts = timespec_add(*ts, tk->total_sleep_time); |
Tomas Janousek | 7c3f1a5 | 2007-07-15 23:39:41 -0700 | [diff] [blame] | 1499 | } |
Jason Wang | c93d89f | 2010-01-27 19:13:40 +0800 | [diff] [blame] | 1500 | EXPORT_SYMBOL_GPL(monotonic_to_bootbased); |
john stultz | 2c6b47d | 2007-07-24 17:47:43 -0700 | [diff] [blame] | 1501 | |
john stultz | 17c38b7 | 2007-07-24 18:38:34 -0700 | [diff] [blame] | 1502 | unsigned long get_seconds(void) |
| 1503 | { |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 1504 | struct timekeeper *tk = &timekeeper; |
| 1505 | |
| 1506 | return tk->xtime_sec; |
john stultz | 17c38b7 | 2007-07-24 18:38:34 -0700 | [diff] [blame] | 1507 | } |
| 1508 | EXPORT_SYMBOL(get_seconds); |
| 1509 | |
john stultz | da15cfd | 2009-08-19 19:13:34 -0700 | [diff] [blame] | 1510 | struct timespec __current_kernel_time(void) |
| 1511 | { |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 1512 | struct timekeeper *tk = &timekeeper; |
| 1513 | |
| 1514 | return tk_xtime(tk); |
john stultz | da15cfd | 2009-08-19 19:13:34 -0700 | [diff] [blame] | 1515 | } |
john stultz | 17c38b7 | 2007-07-24 18:38:34 -0700 | [diff] [blame] | 1516 | |
john stultz | 2c6b47d | 2007-07-24 17:47:43 -0700 | [diff] [blame] | 1517 | struct timespec current_kernel_time(void) |
| 1518 | { |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 1519 | struct timekeeper *tk = &timekeeper; |
john stultz | 2c6b47d | 2007-07-24 17:47:43 -0700 | [diff] [blame] | 1520 | struct timespec now; |
| 1521 | unsigned long seq; |
| 1522 | |
| 1523 | do { |
Thomas Gleixner | 9a7a71b | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 1524 | seq = read_seqcount_begin(&timekeeper_seq); |
Linus Torvalds | 83f57a1 | 2009-12-22 14:10:37 -0800 | [diff] [blame] | 1525 | |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 1526 | now = tk_xtime(tk); |
Thomas Gleixner | 9a7a71b | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 1527 | } while (read_seqcount_retry(&timekeeper_seq, seq)); |
john stultz | 2c6b47d | 2007-07-24 17:47:43 -0700 | [diff] [blame] | 1528 | |
| 1529 | return now; |
| 1530 | } |
john stultz | 2c6b47d | 2007-07-24 17:47:43 -0700 | [diff] [blame] | 1531 | EXPORT_SYMBOL(current_kernel_time); |
john stultz | da15cfd | 2009-08-19 19:13:34 -0700 | [diff] [blame] | 1532 | |
| 1533 | struct timespec get_monotonic_coarse(void) |
| 1534 | { |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 1535 | struct timekeeper *tk = &timekeeper; |
john stultz | da15cfd | 2009-08-19 19:13:34 -0700 | [diff] [blame] | 1536 | struct timespec now, mono; |
| 1537 | unsigned long seq; |
| 1538 | |
| 1539 | do { |
Thomas Gleixner | 9a7a71b | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 1540 | seq = read_seqcount_begin(&timekeeper_seq); |
Linus Torvalds | 83f57a1 | 2009-12-22 14:10:37 -0800 | [diff] [blame] | 1541 | |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 1542 | now = tk_xtime(tk); |
| 1543 | mono = tk->wall_to_monotonic; |
Thomas Gleixner | 9a7a71b | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 1544 | } while (read_seqcount_retry(&timekeeper_seq, seq)); |
john stultz | da15cfd | 2009-08-19 19:13:34 -0700 | [diff] [blame] | 1545 | |
| 1546 | set_normalized_timespec(&now, now.tv_sec + mono.tv_sec, |
| 1547 | now.tv_nsec + mono.tv_nsec); |
| 1548 | return now; |
| 1549 | } |
Torben Hohn | 871cf1e | 2011-01-27 15:58:55 +0100 | [diff] [blame] | 1550 | |
| 1551 | /* |
John Stultz | d6ad418 | 2012-02-28 16:50:11 -0800 | [diff] [blame] | 1552 | * Must hold jiffies_lock |
Torben Hohn | 871cf1e | 2011-01-27 15:58:55 +0100 | [diff] [blame] | 1553 | */ |
| 1554 | void do_timer(unsigned long ticks) |
| 1555 | { |
| 1556 | jiffies_64 += ticks; |
| 1557 | update_wall_time(); |
| 1558 | calc_global_load(ticks); |
| 1559 | } |
Torben Hohn | 48cf76f7 | 2011-01-27 15:59:05 +0100 | [diff] [blame] | 1560 | |
| 1561 | /** |
John Stultz | 314ac37 | 2011-02-14 18:43:08 -0800 | [diff] [blame] | 1562 | * get_xtime_and_monotonic_and_sleep_offset() - get xtime, wall_to_monotonic, |
| 1563 | * and sleep offsets. |
Torben Hohn | 48cf76f7 | 2011-01-27 15:59:05 +0100 | [diff] [blame] | 1564 | * @xtim: pointer to timespec to be set with xtime |
| 1565 | * @wtom: pointer to timespec to be set with wall_to_monotonic |
John Stultz | 314ac37 | 2011-02-14 18:43:08 -0800 | [diff] [blame] | 1566 | * @sleep: pointer to timespec to be set with time in suspend |
Torben Hohn | 48cf76f7 | 2011-01-27 15:59:05 +0100 | [diff] [blame] | 1567 | */ |
John Stultz | 314ac37 | 2011-02-14 18:43:08 -0800 | [diff] [blame] | 1568 | void get_xtime_and_monotonic_and_sleep_offset(struct timespec *xtim, |
| 1569 | struct timespec *wtom, struct timespec *sleep) |
Torben Hohn | 48cf76f7 | 2011-01-27 15:59:05 +0100 | [diff] [blame] | 1570 | { |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 1571 | struct timekeeper *tk = &timekeeper; |
Torben Hohn | 48cf76f7 | 2011-01-27 15:59:05 +0100 | [diff] [blame] | 1572 | unsigned long seq; |
| 1573 | |
| 1574 | do { |
Thomas Gleixner | 9a7a71b | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 1575 | seq = read_seqcount_begin(&timekeeper_seq); |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 1576 | *xtim = tk_xtime(tk); |
| 1577 | *wtom = tk->wall_to_monotonic; |
| 1578 | *sleep = tk->total_sleep_time; |
Thomas Gleixner | 9a7a71b | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 1579 | } while (read_seqcount_retry(&timekeeper_seq, seq)); |
Torben Hohn | 48cf76f7 | 2011-01-27 15:59:05 +0100 | [diff] [blame] | 1580 | } |
Torben Hohn | f0af911a9 | 2011-01-27 15:59:10 +0100 | [diff] [blame] | 1581 | |
Thomas Gleixner | f6c06ab | 2012-07-10 18:43:24 -0400 | [diff] [blame] | 1582 | #ifdef CONFIG_HIGH_RES_TIMERS |
| 1583 | /** |
| 1584 | * ktime_get_update_offsets - hrtimer helper |
| 1585 | * @offs_real: pointer to storage for monotonic -> realtime offset |
| 1586 | * @offs_boot: pointer to storage for monotonic -> boottime offset |
| 1587 | * |
| 1588 | * Returns current monotonic time and updates the offsets |
| 1589 | * Called from hrtimer_interupt() or retrigger_next_event() |
| 1590 | */ |
John Stultz | 90adda9 | 2013-01-21 17:00:11 -0800 | [diff] [blame] | 1591 | ktime_t ktime_get_update_offsets(ktime_t *offs_real, ktime_t *offs_boot, |
| 1592 | ktime_t *offs_tai) |
Thomas Gleixner | f6c06ab | 2012-07-10 18:43:24 -0400 | [diff] [blame] | 1593 | { |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 1594 | struct timekeeper *tk = &timekeeper; |
Thomas Gleixner | f6c06ab | 2012-07-10 18:43:24 -0400 | [diff] [blame] | 1595 | ktime_t now; |
| 1596 | unsigned int seq; |
| 1597 | u64 secs, nsecs; |
| 1598 | |
| 1599 | do { |
Thomas Gleixner | 9a7a71b | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 1600 | seq = read_seqcount_begin(&timekeeper_seq); |
Thomas Gleixner | f6c06ab | 2012-07-10 18:43:24 -0400 | [diff] [blame] | 1601 | |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 1602 | secs = tk->xtime_sec; |
| 1603 | nsecs = timekeeping_get_ns(tk); |
Thomas Gleixner | f6c06ab | 2012-07-10 18:43:24 -0400 | [diff] [blame] | 1604 | |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 1605 | *offs_real = tk->offs_real; |
| 1606 | *offs_boot = tk->offs_boot; |
John Stultz | 90adda9 | 2013-01-21 17:00:11 -0800 | [diff] [blame] | 1607 | *offs_tai = tk->offs_tai; |
Thomas Gleixner | 9a7a71b | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 1608 | } while (read_seqcount_retry(&timekeeper_seq, seq)); |
Thomas Gleixner | f6c06ab | 2012-07-10 18:43:24 -0400 | [diff] [blame] | 1609 | |
| 1610 | now = ktime_add_ns(ktime_set(secs, 0), nsecs); |
| 1611 | now = ktime_sub(now, *offs_real); |
| 1612 | return now; |
| 1613 | } |
| 1614 | #endif |
| 1615 | |
Torben Hohn | f0af911a9 | 2011-01-27 15:59:10 +0100 | [diff] [blame] | 1616 | /** |
Thomas Gleixner | 99ee531 | 2011-04-27 14:16:42 +0200 | [diff] [blame] | 1617 | * ktime_get_monotonic_offset() - get wall_to_monotonic in ktime_t format |
| 1618 | */ |
| 1619 | ktime_t ktime_get_monotonic_offset(void) |
| 1620 | { |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 1621 | struct timekeeper *tk = &timekeeper; |
Thomas Gleixner | 99ee531 | 2011-04-27 14:16:42 +0200 | [diff] [blame] | 1622 | unsigned long seq; |
| 1623 | struct timespec wtom; |
| 1624 | |
| 1625 | do { |
Thomas Gleixner | 9a7a71b | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 1626 | seq = read_seqcount_begin(&timekeeper_seq); |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 1627 | wtom = tk->wall_to_monotonic; |
Thomas Gleixner | 9a7a71b | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 1628 | } while (read_seqcount_retry(&timekeeper_seq, seq)); |
John Stultz | 70471f2 | 2011-11-14 12:48:10 -0800 | [diff] [blame] | 1629 | |
Thomas Gleixner | 99ee531 | 2011-04-27 14:16:42 +0200 | [diff] [blame] | 1630 | return timespec_to_ktime(wtom); |
| 1631 | } |
John Stultz | a80b83b | 2012-02-03 00:19:07 -0800 | [diff] [blame] | 1632 | EXPORT_SYMBOL_GPL(ktime_get_monotonic_offset); |
| 1633 | |
Thomas Gleixner | 99ee531 | 2011-04-27 14:16:42 +0200 | [diff] [blame] | 1634 | /** |
John Stultz | aa6f9c59 | 2013-03-22 11:31:29 -0700 | [diff] [blame] | 1635 | * do_adjtimex() - Accessor function to NTP __do_adjtimex function |
| 1636 | */ |
| 1637 | int do_adjtimex(struct timex *txc) |
| 1638 | { |
John Stultz | 0b5154f | 2013-03-22 14:20:03 -0700 | [diff] [blame] | 1639 | struct timekeeper *tk = &timekeeper; |
John Stultz | 06c017f | 2013-03-22 11:37:28 -0700 | [diff] [blame] | 1640 | unsigned long flags; |
John Stultz | 87ace39 | 2013-03-22 12:28:15 -0700 | [diff] [blame] | 1641 | struct timespec ts; |
John Stultz | 0b5154f | 2013-03-22 14:20:03 -0700 | [diff] [blame] | 1642 | s32 tai; |
John Stultz | e408569 | 2013-03-22 12:08:52 -0700 | [diff] [blame] | 1643 | int ret; |
| 1644 | |
| 1645 | /* Validate the data before disabling interrupts */ |
| 1646 | ret = ntp_validate_timex(txc); |
| 1647 | if (ret) |
| 1648 | return ret; |
| 1649 | |
John Stultz | cef9037 | 2013-03-22 15:04:13 -0700 | [diff] [blame] | 1650 | if (txc->modes & ADJ_SETOFFSET) { |
| 1651 | struct timespec delta; |
| 1652 | delta.tv_sec = txc->time.tv_sec; |
| 1653 | delta.tv_nsec = txc->time.tv_usec; |
| 1654 | if (!(txc->modes & ADJ_NANO)) |
| 1655 | delta.tv_nsec *= 1000; |
| 1656 | ret = timekeeping_inject_offset(&delta); |
| 1657 | if (ret) |
| 1658 | return ret; |
| 1659 | } |
| 1660 | |
John Stultz | 87ace39 | 2013-03-22 12:28:15 -0700 | [diff] [blame] | 1661 | getnstimeofday(&ts); |
John Stultz | aa6f9c59 | 2013-03-22 11:31:29 -0700 | [diff] [blame] | 1662 | |
John Stultz | 06c017f | 2013-03-22 11:37:28 -0700 | [diff] [blame] | 1663 | raw_spin_lock_irqsave(&timekeeper_lock, flags); |
| 1664 | write_seqcount_begin(&timekeeper_seq); |
| 1665 | |
John Stultz | 0b5154f | 2013-03-22 14:20:03 -0700 | [diff] [blame] | 1666 | tai = tk->tai_offset; |
John Stultz | 87ace39 | 2013-03-22 12:28:15 -0700 | [diff] [blame] | 1667 | ret = __do_adjtimex(txc, &ts, &tai); |
| 1668 | |
John Stultz | 0b5154f | 2013-03-22 14:20:03 -0700 | [diff] [blame] | 1669 | __timekeeping_set_tai_offset(tk, tai); |
John Stultz | 06c017f | 2013-03-22 11:37:28 -0700 | [diff] [blame] | 1670 | write_seqcount_end(&timekeeper_seq); |
| 1671 | raw_spin_unlock_irqrestore(&timekeeper_lock, flags); |
| 1672 | |
John Stultz | 87ace39 | 2013-03-22 12:28:15 -0700 | [diff] [blame] | 1673 | return ret; |
| 1674 | } |
John Stultz | aa6f9c59 | 2013-03-22 11:31:29 -0700 | [diff] [blame] | 1675 | |
| 1676 | #ifdef CONFIG_NTP_PPS |
| 1677 | /** |
| 1678 | * hardpps() - Accessor function to NTP __hardpps function |
| 1679 | */ |
| 1680 | void hardpps(const struct timespec *phase_ts, const struct timespec *raw_ts) |
| 1681 | { |
John Stultz | 06c017f | 2013-03-22 11:37:28 -0700 | [diff] [blame] | 1682 | unsigned long flags; |
| 1683 | |
| 1684 | raw_spin_lock_irqsave(&timekeeper_lock, flags); |
| 1685 | write_seqcount_begin(&timekeeper_seq); |
| 1686 | |
John Stultz | aa6f9c59 | 2013-03-22 11:31:29 -0700 | [diff] [blame] | 1687 | __hardpps(phase_ts, raw_ts); |
John Stultz | 06c017f | 2013-03-22 11:37:28 -0700 | [diff] [blame] | 1688 | |
| 1689 | write_seqcount_end(&timekeeper_seq); |
| 1690 | raw_spin_unlock_irqrestore(&timekeeper_lock, flags); |
John Stultz | aa6f9c59 | 2013-03-22 11:31:29 -0700 | [diff] [blame] | 1691 | } |
| 1692 | EXPORT_SYMBOL(hardpps); |
| 1693 | #endif |
| 1694 | |
| 1695 | /** |
Torben Hohn | f0af911a9 | 2011-01-27 15:59:10 +0100 | [diff] [blame] | 1696 | * xtime_update() - advances the timekeeping infrastructure |
| 1697 | * @ticks: number of ticks, that have elapsed since the last call. |
| 1698 | * |
| 1699 | * Must be called with interrupts disabled. |
| 1700 | */ |
| 1701 | void xtime_update(unsigned long ticks) |
| 1702 | { |
John Stultz | d6ad418 | 2012-02-28 16:50:11 -0800 | [diff] [blame] | 1703 | write_seqlock(&jiffies_lock); |
Torben Hohn | f0af911a9 | 2011-01-27 15:59:10 +0100 | [diff] [blame] | 1704 | do_timer(ticks); |
John Stultz | d6ad418 | 2012-02-28 16:50:11 -0800 | [diff] [blame] | 1705 | write_sequnlock(&jiffies_lock); |
Torben Hohn | f0af911a9 | 2011-01-27 15:59:10 +0100 | [diff] [blame] | 1706 | } |