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> |
Gideon Israel Dsouza | 52f5684c | 2014-04-07 15:39:20 -0700 | [diff] [blame] | 25 | #include <linux/compiler.h> |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 26 | |
Thomas Gleixner | eb93e4d | 2013-02-21 22:51:36 +0000 | [diff] [blame] | 27 | #include "tick-internal.h" |
John Stultz | aa6f9c59 | 2013-03-22 11:31:29 -0700 | [diff] [blame] | 28 | #include "ntp_internal.h" |
Colin Cross | 5c83545 | 2013-05-21 22:32:14 -0700 | [diff] [blame] | 29 | #include "timekeeping_internal.h" |
Martin Schwidefsky | 155ec60 | 2009-08-14 15:47:26 +0200 | [diff] [blame] | 30 | |
David Vrabel | 04397fe9 | 2013-06-27 11:35:45 +0100 | [diff] [blame] | 31 | #define TK_CLEAR_NTP (1 << 0) |
| 32 | #define TK_MIRROR (1 << 1) |
David Vrabel | 780427f | 2013-06-27 11:35:46 +0100 | [diff] [blame] | 33 | #define TK_CLOCK_WAS_SET (1 << 2) |
David Vrabel | 04397fe9 | 2013-06-27 11:35:45 +0100 | [diff] [blame] | 34 | |
Thomas Gleixner | 3fdb14f | 2014-07-16 21:04:07 +0000 | [diff] [blame] | 35 | /* |
| 36 | * The most important data for readout fits into a single 64 byte |
| 37 | * cache line. |
| 38 | */ |
| 39 | static struct { |
| 40 | seqcount_t seq; |
| 41 | struct timekeeper timekeeper; |
| 42 | } tk_core ____cacheline_aligned; |
| 43 | |
Thomas Gleixner | 9a7a71b | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 44 | static DEFINE_RAW_SPINLOCK(timekeeper_lock); |
Thomas Gleixner | 48cdc13 | 2013-02-21 22:51:40 +0000 | [diff] [blame] | 45 | static struct timekeeper shadow_timekeeper; |
Martin Schwidefsky | 155ec60 | 2009-08-14 15:47:26 +0200 | [diff] [blame] | 46 | |
John Stultz | 8fcce54 | 2011-11-14 11:46:39 -0800 | [diff] [blame] | 47 | /* flag for if timekeeping is suspended */ |
| 48 | int __read_mostly timekeeping_suspended; |
| 49 | |
Feng Tang | 31ade30 | 2013-01-16 00:09:47 +0800 | [diff] [blame] | 50 | /* Flag for if there is a persistent clock on this platform */ |
| 51 | bool __read_mostly persistent_clock_exist = false; |
| 52 | |
John Stultz | 1e75fa8 | 2012-07-13 01:21:53 -0400 | [diff] [blame] | 53 | static inline void tk_normalize_xtime(struct timekeeper *tk) |
| 54 | { |
| 55 | while (tk->xtime_nsec >= ((u64)NSEC_PER_SEC << tk->shift)) { |
| 56 | tk->xtime_nsec -= (u64)NSEC_PER_SEC << tk->shift; |
| 57 | tk->xtime_sec++; |
| 58 | } |
| 59 | } |
John Stultz | 8fcce54 | 2011-11-14 11:46:39 -0800 | [diff] [blame] | 60 | |
Thomas Gleixner | c905fae | 2014-07-16 21:04:05 +0000 | [diff] [blame] | 61 | static inline struct timespec64 tk_xtime(struct timekeeper *tk) |
| 62 | { |
| 63 | struct timespec64 ts; |
| 64 | |
| 65 | ts.tv_sec = tk->xtime_sec; |
| 66 | ts.tv_nsec = (long)(tk->xtime_nsec >> tk->shift); |
| 67 | return ts; |
| 68 | } |
| 69 | |
John Stultz | 7d489d1 | 2014-07-16 21:04:01 +0000 | [diff] [blame] | 70 | static void tk_set_xtime(struct timekeeper *tk, const struct timespec64 *ts) |
John Stultz | 1e75fa8 | 2012-07-13 01:21:53 -0400 | [diff] [blame] | 71 | { |
| 72 | tk->xtime_sec = ts->tv_sec; |
John Stultz | b44d50d | 2012-07-23 16:22:37 -0400 | [diff] [blame] | 73 | tk->xtime_nsec = (u64)ts->tv_nsec << tk->shift; |
John Stultz | 1e75fa8 | 2012-07-13 01:21:53 -0400 | [diff] [blame] | 74 | } |
| 75 | |
John Stultz | 7d489d1 | 2014-07-16 21:04:01 +0000 | [diff] [blame] | 76 | static void tk_xtime_add(struct timekeeper *tk, const struct timespec64 *ts) |
John Stultz | 1e75fa8 | 2012-07-13 01:21:53 -0400 | [diff] [blame] | 77 | { |
| 78 | tk->xtime_sec += ts->tv_sec; |
John Stultz | b44d50d | 2012-07-23 16:22:37 -0400 | [diff] [blame] | 79 | tk->xtime_nsec += (u64)ts->tv_nsec << tk->shift; |
John Stultz | 784ffcb | 2012-08-21 20:30:46 -0400 | [diff] [blame] | 80 | tk_normalize_xtime(tk); |
John Stultz | 1e75fa8 | 2012-07-13 01:21:53 -0400 | [diff] [blame] | 81 | } |
John Stultz | 8fcce54 | 2011-11-14 11:46:39 -0800 | [diff] [blame] | 82 | |
John Stultz | 7d489d1 | 2014-07-16 21:04:01 +0000 | [diff] [blame] | 83 | static void tk_set_wall_to_mono(struct timekeeper *tk, struct timespec64 wtm) |
John Stultz | 6d0ef90 | 2012-07-27 14:48:12 -0400 | [diff] [blame] | 84 | { |
John Stultz | 7d489d1 | 2014-07-16 21:04:01 +0000 | [diff] [blame] | 85 | struct timespec64 tmp; |
John Stultz | 6d0ef90 | 2012-07-27 14:48:12 -0400 | [diff] [blame] | 86 | |
| 87 | /* |
| 88 | * Verify consistency of: offset_real = -wall_to_monotonic |
| 89 | * before modifying anything |
| 90 | */ |
John Stultz | 7d489d1 | 2014-07-16 21:04:01 +0000 | [diff] [blame] | 91 | set_normalized_timespec64(&tmp, -tk->wall_to_monotonic.tv_sec, |
John Stultz | 6d0ef90 | 2012-07-27 14:48:12 -0400 | [diff] [blame] | 92 | -tk->wall_to_monotonic.tv_nsec); |
John Stultz | 7d489d1 | 2014-07-16 21:04:01 +0000 | [diff] [blame] | 93 | WARN_ON_ONCE(tk->offs_real.tv64 != timespec64_to_ktime(tmp).tv64); |
John Stultz | 6d0ef90 | 2012-07-27 14:48:12 -0400 | [diff] [blame] | 94 | tk->wall_to_monotonic = wtm; |
John Stultz | 7d489d1 | 2014-07-16 21:04:01 +0000 | [diff] [blame] | 95 | set_normalized_timespec64(&tmp, -wtm.tv_sec, -wtm.tv_nsec); |
| 96 | tk->offs_real = timespec64_to_ktime(tmp); |
John Stultz | 04005f6 | 2013-12-10 17:13:35 -0800 | [diff] [blame] | 97 | tk->offs_tai = ktime_add(tk->offs_real, ktime_set(tk->tai_offset, 0)); |
John Stultz | 6d0ef90 | 2012-07-27 14:48:12 -0400 | [diff] [blame] | 98 | } |
| 99 | |
John Stultz | 7d489d1 | 2014-07-16 21:04:01 +0000 | [diff] [blame] | 100 | static void tk_set_sleep_time(struct timekeeper *tk, struct timespec64 t) |
John Stultz | 6d0ef90 | 2012-07-27 14:48:12 -0400 | [diff] [blame] | 101 | { |
| 102 | /* Verify consistency before modifying */ |
John Stultz | 7d489d1 | 2014-07-16 21:04:01 +0000 | [diff] [blame] | 103 | WARN_ON_ONCE(tk->offs_boot.tv64 != timespec64_to_ktime(tk->total_sleep_time).tv64); |
John Stultz | 6d0ef90 | 2012-07-27 14:48:12 -0400 | [diff] [blame] | 104 | |
| 105 | tk->total_sleep_time = t; |
John Stultz | 7d489d1 | 2014-07-16 21:04:01 +0000 | [diff] [blame] | 106 | tk->offs_boot = timespec64_to_ktime(t); |
John Stultz | 6d0ef90 | 2012-07-27 14:48:12 -0400 | [diff] [blame] | 107 | } |
| 108 | |
Martin Schwidefsky | 155ec60 | 2009-08-14 15:47:26 +0200 | [diff] [blame] | 109 | /** |
Yijing Wang | d26e4fe | 2013-11-28 16:28:55 +0800 | [diff] [blame] | 110 | * tk_setup_internals - Set up internals to use clocksource clock. |
Martin Schwidefsky | 155ec60 | 2009-08-14 15:47:26 +0200 | [diff] [blame] | 111 | * |
Yijing Wang | d26e4fe | 2013-11-28 16:28:55 +0800 | [diff] [blame] | 112 | * @tk: The target timekeeper to setup. |
Martin Schwidefsky | 155ec60 | 2009-08-14 15:47:26 +0200 | [diff] [blame] | 113 | * @clock: Pointer to clocksource. |
| 114 | * |
| 115 | * Calculates a fixed cycle/nsec interval for a given clocksource/adjustment |
| 116 | * pair and interval request. |
| 117 | * |
| 118 | * Unless you're the timekeeping code, you should not be using this! |
| 119 | */ |
John Stultz | f726a69 | 2012-07-13 01:21:57 -0400 | [diff] [blame] | 120 | static void tk_setup_internals(struct timekeeper *tk, struct clocksource *clock) |
Martin Schwidefsky | 155ec60 | 2009-08-14 15:47:26 +0200 | [diff] [blame] | 121 | { |
| 122 | cycle_t interval; |
Kasper Pedersen | a386b5a | 2010-10-20 15:55:15 -0700 | [diff] [blame] | 123 | u64 tmp, ntpinterval; |
John Stultz | 1e75fa8 | 2012-07-13 01:21:53 -0400 | [diff] [blame] | 124 | struct clocksource *old_clock; |
Martin Schwidefsky | 155ec60 | 2009-08-14 15:47:26 +0200 | [diff] [blame] | 125 | |
John Stultz | f726a69 | 2012-07-13 01:21:57 -0400 | [diff] [blame] | 126 | old_clock = tk->clock; |
| 127 | tk->clock = clock; |
Thomas Gleixner | 14a3b6a | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 128 | tk->cycle_last = clock->cycle_last = clock->read(clock); |
Martin Schwidefsky | 155ec60 | 2009-08-14 15:47:26 +0200 | [diff] [blame] | 129 | |
| 130 | /* Do the ns -> cycle conversion first, using original mult */ |
| 131 | tmp = NTP_INTERVAL_LENGTH; |
| 132 | tmp <<= clock->shift; |
Kasper Pedersen | a386b5a | 2010-10-20 15:55:15 -0700 | [diff] [blame] | 133 | ntpinterval = tmp; |
Martin Schwidefsky | 0a54419 | 2009-08-14 15:47:28 +0200 | [diff] [blame] | 134 | tmp += clock->mult/2; |
| 135 | do_div(tmp, clock->mult); |
Martin Schwidefsky | 155ec60 | 2009-08-14 15:47:26 +0200 | [diff] [blame] | 136 | if (tmp == 0) |
| 137 | tmp = 1; |
| 138 | |
| 139 | interval = (cycle_t) tmp; |
John Stultz | f726a69 | 2012-07-13 01:21:57 -0400 | [diff] [blame] | 140 | tk->cycle_interval = interval; |
Martin Schwidefsky | 155ec60 | 2009-08-14 15:47:26 +0200 | [diff] [blame] | 141 | |
| 142 | /* Go back from cycles -> shifted ns */ |
John Stultz | f726a69 | 2012-07-13 01:21:57 -0400 | [diff] [blame] | 143 | tk->xtime_interval = (u64) interval * clock->mult; |
| 144 | tk->xtime_remainder = ntpinterval - tk->xtime_interval; |
| 145 | tk->raw_interval = |
Martin Schwidefsky | 0a54419 | 2009-08-14 15:47:28 +0200 | [diff] [blame] | 146 | ((u64) interval * clock->mult) >> clock->shift; |
Martin Schwidefsky | 155ec60 | 2009-08-14 15:47:26 +0200 | [diff] [blame] | 147 | |
John Stultz | 1e75fa8 | 2012-07-13 01:21:53 -0400 | [diff] [blame] | 148 | /* if changing clocks, convert xtime_nsec shift units */ |
| 149 | if (old_clock) { |
| 150 | int shift_change = clock->shift - old_clock->shift; |
| 151 | if (shift_change < 0) |
John Stultz | f726a69 | 2012-07-13 01:21:57 -0400 | [diff] [blame] | 152 | tk->xtime_nsec >>= -shift_change; |
John Stultz | 1e75fa8 | 2012-07-13 01:21:53 -0400 | [diff] [blame] | 153 | else |
John Stultz | f726a69 | 2012-07-13 01:21:57 -0400 | [diff] [blame] | 154 | tk->xtime_nsec <<= shift_change; |
John Stultz | 1e75fa8 | 2012-07-13 01:21:53 -0400 | [diff] [blame] | 155 | } |
John Stultz | f726a69 | 2012-07-13 01:21:57 -0400 | [diff] [blame] | 156 | tk->shift = clock->shift; |
Martin Schwidefsky | 155ec60 | 2009-08-14 15:47:26 +0200 | [diff] [blame] | 157 | |
John Stultz | f726a69 | 2012-07-13 01:21:57 -0400 | [diff] [blame] | 158 | tk->ntp_error = 0; |
| 159 | tk->ntp_error_shift = NTP_SCALE_SHIFT - clock->shift; |
Martin Schwidefsky | 0a54419 | 2009-08-14 15:47:28 +0200 | [diff] [blame] | 160 | |
| 161 | /* |
| 162 | * The timekeeper keeps its own mult values for the currently |
| 163 | * active clocksource. These value will be adjusted via NTP |
| 164 | * to counteract clock drifting. |
| 165 | */ |
John Stultz | f726a69 | 2012-07-13 01:21:57 -0400 | [diff] [blame] | 166 | tk->mult = clock->mult; |
Martin Schwidefsky | 155ec60 | 2009-08-14 15:47:26 +0200 | [diff] [blame] | 167 | } |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 168 | |
Martin Schwidefsky | 2ba2a30 | 2009-08-14 15:47:29 +0200 | [diff] [blame] | 169 | /* Timekeeper helper functions. */ |
Stephen Warren | 7b1f620 | 2012-11-07 17:58:54 -0700 | [diff] [blame] | 170 | |
| 171 | #ifdef CONFIG_ARCH_USES_GETTIMEOFFSET |
Thomas Gleixner | e06fde3 | 2014-07-16 21:03:50 +0000 | [diff] [blame] | 172 | static u32 default_arch_gettimeoffset(void) { return 0; } |
| 173 | u32 (*arch_gettimeoffset)(void) = default_arch_gettimeoffset; |
Stephen Warren | 7b1f620 | 2012-11-07 17:58:54 -0700 | [diff] [blame] | 174 | #else |
Thomas Gleixner | e06fde3 | 2014-07-16 21:03:50 +0000 | [diff] [blame] | 175 | static inline u32 arch_gettimeoffset(void) { return 0; } |
Stephen Warren | 7b1f620 | 2012-11-07 17:58:54 -0700 | [diff] [blame] | 176 | #endif |
| 177 | |
John Stultz | f726a69 | 2012-07-13 01:21:57 -0400 | [diff] [blame] | 178 | static inline s64 timekeeping_get_ns(struct timekeeper *tk) |
Martin Schwidefsky | 2ba2a30 | 2009-08-14 15:47:29 +0200 | [diff] [blame] | 179 | { |
| 180 | cycle_t cycle_now, cycle_delta; |
| 181 | struct clocksource *clock; |
John Stultz | 1e75fa8 | 2012-07-13 01:21:53 -0400 | [diff] [blame] | 182 | s64 nsec; |
Martin Schwidefsky | 2ba2a30 | 2009-08-14 15:47:29 +0200 | [diff] [blame] | 183 | |
| 184 | /* read clocksource: */ |
John Stultz | f726a69 | 2012-07-13 01:21:57 -0400 | [diff] [blame] | 185 | clock = tk->clock; |
Martin Schwidefsky | 2ba2a30 | 2009-08-14 15:47:29 +0200 | [diff] [blame] | 186 | cycle_now = clock->read(clock); |
| 187 | |
| 188 | /* calculate the delta since the last update_wall_time: */ |
| 189 | cycle_delta = (cycle_now - clock->cycle_last) & clock->mask; |
| 190 | |
John Stultz | f726a69 | 2012-07-13 01:21:57 -0400 | [diff] [blame] | 191 | nsec = cycle_delta * tk->mult + tk->xtime_nsec; |
| 192 | nsec >>= tk->shift; |
John Stultz | f2a5a08 | 2012-07-13 01:21:55 -0400 | [diff] [blame] | 193 | |
Stephen Warren | 7b1f620 | 2012-11-07 17:58:54 -0700 | [diff] [blame] | 194 | /* If arch requires, add in get_arch_timeoffset() */ |
Thomas Gleixner | e06fde3 | 2014-07-16 21:03:50 +0000 | [diff] [blame] | 195 | return nsec + arch_gettimeoffset(); |
Martin Schwidefsky | 2ba2a30 | 2009-08-14 15:47:29 +0200 | [diff] [blame] | 196 | } |
| 197 | |
John Stultz | f726a69 | 2012-07-13 01:21:57 -0400 | [diff] [blame] | 198 | static inline s64 timekeeping_get_ns_raw(struct timekeeper *tk) |
Martin Schwidefsky | 2ba2a30 | 2009-08-14 15:47:29 +0200 | [diff] [blame] | 199 | { |
| 200 | cycle_t cycle_now, cycle_delta; |
| 201 | struct clocksource *clock; |
John Stultz | f2a5a08 | 2012-07-13 01:21:55 -0400 | [diff] [blame] | 202 | s64 nsec; |
Martin Schwidefsky | 2ba2a30 | 2009-08-14 15:47:29 +0200 | [diff] [blame] | 203 | |
| 204 | /* read clocksource: */ |
John Stultz | f726a69 | 2012-07-13 01:21:57 -0400 | [diff] [blame] | 205 | clock = tk->clock; |
Martin Schwidefsky | 2ba2a30 | 2009-08-14 15:47:29 +0200 | [diff] [blame] | 206 | cycle_now = clock->read(clock); |
| 207 | |
| 208 | /* calculate the delta since the last update_wall_time: */ |
| 209 | cycle_delta = (cycle_now - clock->cycle_last) & clock->mask; |
| 210 | |
John Stultz | f2a5a08 | 2012-07-13 01:21:55 -0400 | [diff] [blame] | 211 | /* convert delta to nanoseconds. */ |
| 212 | nsec = clocksource_cyc2ns(cycle_delta, clock->mult, clock->shift); |
| 213 | |
Stephen Warren | 7b1f620 | 2012-11-07 17:58:54 -0700 | [diff] [blame] | 214 | /* If arch requires, add in get_arch_timeoffset() */ |
Thomas Gleixner | e06fde3 | 2014-07-16 21:03:50 +0000 | [diff] [blame] | 215 | return nsec + arch_gettimeoffset(); |
Martin Schwidefsky | 2ba2a30 | 2009-08-14 15:47:29 +0200 | [diff] [blame] | 216 | } |
| 217 | |
Thomas Gleixner | c905fae | 2014-07-16 21:04:05 +0000 | [diff] [blame] | 218 | #ifdef CONFIG_GENERIC_TIME_VSYSCALL_OLD |
| 219 | |
| 220 | static inline void update_vsyscall(struct timekeeper *tk) |
| 221 | { |
| 222 | struct timespec xt; |
| 223 | |
| 224 | xt = tk_xtime(tk); |
| 225 | update_vsyscall_old(&xt, &tk->wall_to_monotonic, tk->clock, tk->mult); |
| 226 | } |
| 227 | |
| 228 | static inline void old_vsyscall_fixup(struct timekeeper *tk) |
| 229 | { |
| 230 | s64 remainder; |
| 231 | |
| 232 | /* |
| 233 | * Store only full nanoseconds into xtime_nsec after rounding |
| 234 | * it up and add the remainder to the error difference. |
| 235 | * XXX - This is necessary to avoid small 1ns inconsistnecies caused |
| 236 | * by truncating the remainder in vsyscalls. However, it causes |
| 237 | * additional work to be done in timekeeping_adjust(). Once |
| 238 | * the vsyscall implementations are converted to use xtime_nsec |
| 239 | * (shifted nanoseconds), and CONFIG_GENERIC_TIME_VSYSCALL_OLD |
| 240 | * users are removed, this can be killed. |
| 241 | */ |
| 242 | remainder = tk->xtime_nsec & ((1ULL << tk->shift) - 1); |
| 243 | tk->xtime_nsec -= remainder; |
| 244 | tk->xtime_nsec += 1ULL << tk->shift; |
| 245 | tk->ntp_error += remainder << tk->ntp_error_shift; |
| 246 | tk->ntp_error -= (1ULL << tk->shift) << tk->ntp_error_shift; |
| 247 | } |
| 248 | #else |
| 249 | #define old_vsyscall_fixup(tk) |
| 250 | #endif |
| 251 | |
Marcelo Tosatti | e0b306f | 2012-11-27 23:28:59 -0200 | [diff] [blame] | 252 | static RAW_NOTIFIER_HEAD(pvclock_gtod_chain); |
| 253 | |
David Vrabel | 780427f | 2013-06-27 11:35:46 +0100 | [diff] [blame] | 254 | static void update_pvclock_gtod(struct timekeeper *tk, bool was_set) |
Marcelo Tosatti | e0b306f | 2012-11-27 23:28:59 -0200 | [diff] [blame] | 255 | { |
David Vrabel | 780427f | 2013-06-27 11:35:46 +0100 | [diff] [blame] | 256 | raw_notifier_call_chain(&pvclock_gtod_chain, was_set, tk); |
Marcelo Tosatti | e0b306f | 2012-11-27 23:28:59 -0200 | [diff] [blame] | 257 | } |
| 258 | |
| 259 | /** |
| 260 | * pvclock_gtod_register_notifier - register a pvclock timedata update listener |
Marcelo Tosatti | e0b306f | 2012-11-27 23:28:59 -0200 | [diff] [blame] | 261 | */ |
| 262 | int pvclock_gtod_register_notifier(struct notifier_block *nb) |
| 263 | { |
Thomas Gleixner | 3fdb14f | 2014-07-16 21:04:07 +0000 | [diff] [blame] | 264 | struct timekeeper *tk = &tk_core.timekeeper; |
Marcelo Tosatti | e0b306f | 2012-11-27 23:28:59 -0200 | [diff] [blame] | 265 | unsigned long flags; |
| 266 | int ret; |
| 267 | |
Thomas Gleixner | 9a7a71b | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 268 | raw_spin_lock_irqsave(&timekeeper_lock, flags); |
Marcelo Tosatti | e0b306f | 2012-11-27 23:28:59 -0200 | [diff] [blame] | 269 | ret = raw_notifier_chain_register(&pvclock_gtod_chain, nb); |
David Vrabel | 780427f | 2013-06-27 11:35:46 +0100 | [diff] [blame] | 270 | update_pvclock_gtod(tk, true); |
Thomas Gleixner | 9a7a71b | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 271 | raw_spin_unlock_irqrestore(&timekeeper_lock, flags); |
Marcelo Tosatti | e0b306f | 2012-11-27 23:28:59 -0200 | [diff] [blame] | 272 | |
| 273 | return ret; |
| 274 | } |
| 275 | EXPORT_SYMBOL_GPL(pvclock_gtod_register_notifier); |
| 276 | |
| 277 | /** |
| 278 | * pvclock_gtod_unregister_notifier - unregister a pvclock |
| 279 | * timedata update listener |
Marcelo Tosatti | e0b306f | 2012-11-27 23:28:59 -0200 | [diff] [blame] | 280 | */ |
| 281 | int pvclock_gtod_unregister_notifier(struct notifier_block *nb) |
| 282 | { |
Marcelo Tosatti | e0b306f | 2012-11-27 23:28:59 -0200 | [diff] [blame] | 283 | unsigned long flags; |
| 284 | int ret; |
| 285 | |
Thomas Gleixner | 9a7a71b | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 286 | raw_spin_lock_irqsave(&timekeeper_lock, flags); |
Marcelo Tosatti | e0b306f | 2012-11-27 23:28:59 -0200 | [diff] [blame] | 287 | ret = raw_notifier_chain_unregister(&pvclock_gtod_chain, nb); |
Thomas Gleixner | 9a7a71b | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 288 | raw_spin_unlock_irqrestore(&timekeeper_lock, flags); |
Marcelo Tosatti | e0b306f | 2012-11-27 23:28:59 -0200 | [diff] [blame] | 289 | |
| 290 | return ret; |
| 291 | } |
| 292 | EXPORT_SYMBOL_GPL(pvclock_gtod_unregister_notifier); |
| 293 | |
Thomas Gleixner | 7c032df | 2014-07-16 21:04:10 +0000 | [diff] [blame] | 294 | /* |
| 295 | * Update the ktime_t based scalar nsec members of the timekeeper |
| 296 | */ |
| 297 | static inline void tk_update_ktime_data(struct timekeeper *tk) |
| 298 | { |
| 299 | s64 nsec; |
| 300 | |
| 301 | /* |
| 302 | * The xtime based monotonic readout is: |
| 303 | * nsec = (xtime_sec + wtm_sec) * 1e9 + wtm_nsec + now(); |
| 304 | * The ktime based monotonic readout is: |
| 305 | * nsec = base_mono + now(); |
| 306 | * ==> base_mono = (xtime_sec + wtm_sec) * 1e9 + wtm_nsec |
| 307 | */ |
| 308 | nsec = (s64)(tk->xtime_sec + tk->wall_to_monotonic.tv_sec); |
| 309 | nsec *= NSEC_PER_SEC; |
| 310 | nsec += tk->wall_to_monotonic.tv_nsec; |
| 311 | tk->base_mono = ns_to_ktime(nsec); |
| 312 | } |
| 313 | |
Thomas Gleixner | 9a7a71b | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 314 | /* must hold timekeeper_lock */ |
David Vrabel | 04397fe9 | 2013-06-27 11:35:45 +0100 | [diff] [blame] | 315 | static void timekeeping_update(struct timekeeper *tk, unsigned int action) |
Thomas Gleixner | cc06268 | 2011-11-13 23:19:49 +0000 | [diff] [blame] | 316 | { |
David Vrabel | 04397fe9 | 2013-06-27 11:35:45 +0100 | [diff] [blame] | 317 | if (action & TK_CLEAR_NTP) { |
John Stultz | f726a69 | 2012-07-13 01:21:57 -0400 | [diff] [blame] | 318 | tk->ntp_error = 0; |
Thomas Gleixner | cc06268 | 2011-11-13 23:19:49 +0000 | [diff] [blame] | 319 | ntp_clear(); |
| 320 | } |
John Stultz | 576094b | 2012-09-11 19:58:13 -0400 | [diff] [blame] | 321 | update_vsyscall(tk); |
David Vrabel | 780427f | 2013-06-27 11:35:46 +0100 | [diff] [blame] | 322 | update_pvclock_gtod(tk, action & TK_CLOCK_WAS_SET); |
Thomas Gleixner | 48cdc13 | 2013-02-21 22:51:40 +0000 | [diff] [blame] | 323 | |
Thomas Gleixner | 7c032df | 2014-07-16 21:04:10 +0000 | [diff] [blame] | 324 | tk_update_ktime_data(tk); |
| 325 | |
David Vrabel | 04397fe9 | 2013-06-27 11:35:45 +0100 | [diff] [blame] | 326 | if (action & TK_MIRROR) |
Thomas Gleixner | 3fdb14f | 2014-07-16 21:04:07 +0000 | [diff] [blame] | 327 | memcpy(&shadow_timekeeper, &tk_core.timekeeper, |
| 328 | sizeof(tk_core.timekeeper)); |
Thomas Gleixner | cc06268 | 2011-11-13 23:19:49 +0000 | [diff] [blame] | 329 | } |
| 330 | |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 331 | /** |
Martin Schwidefsky | 155ec60 | 2009-08-14 15:47:26 +0200 | [diff] [blame] | 332 | * timekeeping_forward_now - update clock to the current time |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 333 | * |
Roman Zippel | 9a05511 | 2008-08-20 16:37:28 -0700 | [diff] [blame] | 334 | * Forward the current clock to update its state since the last call to |
| 335 | * update_wall_time(). This is useful before significant clock changes, |
| 336 | * as it avoids having to deal with this time offset explicitly. |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 337 | */ |
John Stultz | f726a69 | 2012-07-13 01:21:57 -0400 | [diff] [blame] | 338 | static void timekeeping_forward_now(struct timekeeper *tk) |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 339 | { |
| 340 | cycle_t cycle_now, cycle_delta; |
Martin Schwidefsky | 155ec60 | 2009-08-14 15:47:26 +0200 | [diff] [blame] | 341 | struct clocksource *clock; |
Roman Zippel | 9a05511 | 2008-08-20 16:37:28 -0700 | [diff] [blame] | 342 | s64 nsec; |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 343 | |
John Stultz | f726a69 | 2012-07-13 01:21:57 -0400 | [diff] [blame] | 344 | clock = tk->clock; |
Martin Schwidefsky | a0f7d48 | 2009-08-14 15:47:19 +0200 | [diff] [blame] | 345 | cycle_now = clock->read(clock); |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 346 | cycle_delta = (cycle_now - clock->cycle_last) & clock->mask; |
Thomas Gleixner | 14a3b6a | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 347 | tk->cycle_last = clock->cycle_last = cycle_now; |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 348 | |
John Stultz | f726a69 | 2012-07-13 01:21:57 -0400 | [diff] [blame] | 349 | tk->xtime_nsec += cycle_delta * tk->mult; |
john stultz | 7d27558 | 2009-05-01 13:10:26 -0700 | [diff] [blame] | 350 | |
Stephen Warren | 7b1f620 | 2012-11-07 17:58:54 -0700 | [diff] [blame] | 351 | /* If arch requires, add in get_arch_timeoffset() */ |
Thomas Gleixner | e06fde3 | 2014-07-16 21:03:50 +0000 | [diff] [blame] | 352 | tk->xtime_nsec += (u64)arch_gettimeoffset() << tk->shift; |
john stultz | 7d27558 | 2009-05-01 13:10:26 -0700 | [diff] [blame] | 353 | |
John Stultz | f726a69 | 2012-07-13 01:21:57 -0400 | [diff] [blame] | 354 | tk_normalize_xtime(tk); |
John Stultz | 2d42244 | 2008-08-20 16:37:30 -0700 | [diff] [blame] | 355 | |
Martin Schwidefsky | 0a54419 | 2009-08-14 15:47:28 +0200 | [diff] [blame] | 356 | nsec = clocksource_cyc2ns(cycle_delta, clock->mult, clock->shift); |
John Stultz | 7d489d1 | 2014-07-16 21:04:01 +0000 | [diff] [blame] | 357 | timespec64_add_ns(&tk->raw_time, nsec); |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 358 | } |
| 359 | |
| 360 | /** |
Thomas Gleixner | d6d2989 | 2014-07-16 21:04:04 +0000 | [diff] [blame] | 361 | * __getnstimeofday64 - Returns the time of day in a timespec64. |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 362 | * @ts: pointer to the timespec to be set |
| 363 | * |
Kees Cook | 1e817fb | 2012-11-19 10:26:16 -0800 | [diff] [blame] | 364 | * Updates the time of day in the timespec. |
| 365 | * Returns 0 on success, or -ve when suspended (timespec will be undefined). |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 366 | */ |
Thomas Gleixner | d6d2989 | 2014-07-16 21:04:04 +0000 | [diff] [blame] | 367 | int __getnstimeofday64(struct timespec64 *ts) |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 368 | { |
Thomas Gleixner | 3fdb14f | 2014-07-16 21:04:07 +0000 | [diff] [blame] | 369 | struct timekeeper *tk = &tk_core.timekeeper; |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 370 | unsigned long seq; |
John Stultz | 1e75fa8 | 2012-07-13 01:21:53 -0400 | [diff] [blame] | 371 | s64 nsecs = 0; |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 372 | |
| 373 | do { |
Thomas Gleixner | 3fdb14f | 2014-07-16 21:04:07 +0000 | [diff] [blame] | 374 | seq = read_seqcount_begin(&tk_core.seq); |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 375 | |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 376 | ts->tv_sec = tk->xtime_sec; |
John Stultz | ec145ba | 2012-09-11 19:26:03 -0400 | [diff] [blame] | 377 | nsecs = timekeeping_get_ns(tk); |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 378 | |
Thomas Gleixner | 3fdb14f | 2014-07-16 21:04:07 +0000 | [diff] [blame] | 379 | } while (read_seqcount_retry(&tk_core.seq, seq)); |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 380 | |
John Stultz | ec145ba | 2012-09-11 19:26:03 -0400 | [diff] [blame] | 381 | ts->tv_nsec = 0; |
Thomas Gleixner | d6d2989 | 2014-07-16 21:04:04 +0000 | [diff] [blame] | 382 | timespec64_add_ns(ts, nsecs); |
Kees Cook | 1e817fb | 2012-11-19 10:26:16 -0800 | [diff] [blame] | 383 | |
| 384 | /* |
| 385 | * Do not bail out early, in case there were callers still using |
| 386 | * the value, even in the face of the WARN_ON. |
| 387 | */ |
| 388 | if (unlikely(timekeeping_suspended)) |
| 389 | return -EAGAIN; |
| 390 | return 0; |
| 391 | } |
Thomas Gleixner | d6d2989 | 2014-07-16 21:04:04 +0000 | [diff] [blame] | 392 | EXPORT_SYMBOL(__getnstimeofday64); |
Kees Cook | 1e817fb | 2012-11-19 10:26:16 -0800 | [diff] [blame] | 393 | |
| 394 | /** |
Thomas Gleixner | d6d2989 | 2014-07-16 21:04:04 +0000 | [diff] [blame] | 395 | * getnstimeofday64 - Returns the time of day in a timespec64. |
Kees Cook | 1e817fb | 2012-11-19 10:26:16 -0800 | [diff] [blame] | 396 | * @ts: pointer to the timespec to be set |
| 397 | * |
| 398 | * Returns the time of day in a timespec (WARN if suspended). |
| 399 | */ |
Thomas Gleixner | d6d2989 | 2014-07-16 21:04:04 +0000 | [diff] [blame] | 400 | void getnstimeofday64(struct timespec64 *ts) |
Kees Cook | 1e817fb | 2012-11-19 10:26:16 -0800 | [diff] [blame] | 401 | { |
Thomas Gleixner | d6d2989 | 2014-07-16 21:04:04 +0000 | [diff] [blame] | 402 | WARN_ON(__getnstimeofday64(ts)); |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 403 | } |
Thomas Gleixner | d6d2989 | 2014-07-16 21:04:04 +0000 | [diff] [blame] | 404 | EXPORT_SYMBOL(getnstimeofday64); |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 405 | |
Martin Schwidefsky | 951ed4d | 2009-07-07 11:27:28 +0200 | [diff] [blame] | 406 | ktime_t ktime_get(void) |
| 407 | { |
Thomas Gleixner | 3fdb14f | 2014-07-16 21:04:07 +0000 | [diff] [blame] | 408 | struct timekeeper *tk = &tk_core.timekeeper; |
Martin Schwidefsky | 951ed4d | 2009-07-07 11:27:28 +0200 | [diff] [blame] | 409 | unsigned int seq; |
Thomas Gleixner | a016a5b | 2014-07-16 21:04:12 +0000 | [diff] [blame^] | 410 | ktime_t base; |
| 411 | s64 nsecs; |
Martin Schwidefsky | 951ed4d | 2009-07-07 11:27:28 +0200 | [diff] [blame] | 412 | |
| 413 | WARN_ON(timekeeping_suspended); |
| 414 | |
| 415 | do { |
Thomas Gleixner | 3fdb14f | 2014-07-16 21:04:07 +0000 | [diff] [blame] | 416 | seq = read_seqcount_begin(&tk_core.seq); |
Thomas Gleixner | a016a5b | 2014-07-16 21:04:12 +0000 | [diff] [blame^] | 417 | base = tk->base_mono; |
| 418 | nsecs = timekeeping_get_ns(tk); |
Martin Schwidefsky | 951ed4d | 2009-07-07 11:27:28 +0200 | [diff] [blame] | 419 | |
Thomas Gleixner | 3fdb14f | 2014-07-16 21:04:07 +0000 | [diff] [blame] | 420 | } while (read_seqcount_retry(&tk_core.seq, seq)); |
John Stultz | 24e4a8c | 2014-07-16 21:03:53 +0000 | [diff] [blame] | 421 | |
Thomas Gleixner | a016a5b | 2014-07-16 21:04:12 +0000 | [diff] [blame^] | 422 | return ktime_add_ns(base, nsecs); |
Martin Schwidefsky | 951ed4d | 2009-07-07 11:27:28 +0200 | [diff] [blame] | 423 | } |
| 424 | EXPORT_SYMBOL_GPL(ktime_get); |
| 425 | |
| 426 | /** |
Thomas Gleixner | d6d2989 | 2014-07-16 21:04:04 +0000 | [diff] [blame] | 427 | * ktime_get_ts64 - get the monotonic clock in timespec64 format |
Martin Schwidefsky | 951ed4d | 2009-07-07 11:27:28 +0200 | [diff] [blame] | 428 | * @ts: pointer to timespec variable |
| 429 | * |
| 430 | * The function calculates the monotonic clock from the realtime |
| 431 | * clock and the wall_to_monotonic offset and stores the result |
| 432 | * in normalized timespec format in the variable pointed to by @ts. |
| 433 | */ |
Thomas Gleixner | d6d2989 | 2014-07-16 21:04:04 +0000 | [diff] [blame] | 434 | void ktime_get_ts64(struct timespec64 *ts) |
Martin Schwidefsky | 951ed4d | 2009-07-07 11:27:28 +0200 | [diff] [blame] | 435 | { |
Thomas Gleixner | 3fdb14f | 2014-07-16 21:04:07 +0000 | [diff] [blame] | 436 | struct timekeeper *tk = &tk_core.timekeeper; |
Thomas Gleixner | d6d2989 | 2014-07-16 21:04:04 +0000 | [diff] [blame] | 437 | struct timespec64 tomono; |
John Stultz | ec145ba | 2012-09-11 19:26:03 -0400 | [diff] [blame] | 438 | s64 nsec; |
Martin Schwidefsky | 951ed4d | 2009-07-07 11:27:28 +0200 | [diff] [blame] | 439 | unsigned int seq; |
Martin Schwidefsky | 951ed4d | 2009-07-07 11:27:28 +0200 | [diff] [blame] | 440 | |
| 441 | WARN_ON(timekeeping_suspended); |
| 442 | |
| 443 | do { |
Thomas Gleixner | 3fdb14f | 2014-07-16 21:04:07 +0000 | [diff] [blame] | 444 | seq = read_seqcount_begin(&tk_core.seq); |
Thomas Gleixner | d6d2989 | 2014-07-16 21:04:04 +0000 | [diff] [blame] | 445 | ts->tv_sec = tk->xtime_sec; |
John Stultz | ec145ba | 2012-09-11 19:26:03 -0400 | [diff] [blame] | 446 | nsec = timekeeping_get_ns(tk); |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 447 | tomono = tk->wall_to_monotonic; |
Martin Schwidefsky | 951ed4d | 2009-07-07 11:27:28 +0200 | [diff] [blame] | 448 | |
Thomas Gleixner | 3fdb14f | 2014-07-16 21:04:07 +0000 | [diff] [blame] | 449 | } while (read_seqcount_retry(&tk_core.seq, seq)); |
Martin Schwidefsky | 951ed4d | 2009-07-07 11:27:28 +0200 | [diff] [blame] | 450 | |
Thomas Gleixner | d6d2989 | 2014-07-16 21:04:04 +0000 | [diff] [blame] | 451 | ts->tv_sec += tomono.tv_sec; |
| 452 | ts->tv_nsec = 0; |
| 453 | timespec64_add_ns(ts, nsec + tomono.tv_nsec); |
Martin Schwidefsky | 951ed4d | 2009-07-07 11:27:28 +0200 | [diff] [blame] | 454 | } |
Thomas Gleixner | d6d2989 | 2014-07-16 21:04:04 +0000 | [diff] [blame] | 455 | EXPORT_SYMBOL_GPL(ktime_get_ts64); |
Martin Schwidefsky | 951ed4d | 2009-07-07 11:27:28 +0200 | [diff] [blame] | 456 | |
John Stultz | 1ff3c96 | 2012-05-03 12:43:40 -0700 | [diff] [blame] | 457 | |
| 458 | /** |
| 459 | * timekeeping_clocktai - Returns the TAI time of day in a timespec |
| 460 | * @ts: pointer to the timespec to be set |
| 461 | * |
| 462 | * Returns the time of day in a timespec. |
| 463 | */ |
| 464 | void timekeeping_clocktai(struct timespec *ts) |
| 465 | { |
Thomas Gleixner | 3fdb14f | 2014-07-16 21:04:07 +0000 | [diff] [blame] | 466 | struct timekeeper *tk = &tk_core.timekeeper; |
John Stultz | 7d489d1 | 2014-07-16 21:04:01 +0000 | [diff] [blame] | 467 | struct timespec64 ts64; |
John Stultz | 1ff3c96 | 2012-05-03 12:43:40 -0700 | [diff] [blame] | 468 | unsigned long seq; |
| 469 | u64 nsecs; |
| 470 | |
| 471 | WARN_ON(timekeeping_suspended); |
| 472 | |
| 473 | do { |
Thomas Gleixner | 3fdb14f | 2014-07-16 21:04:07 +0000 | [diff] [blame] | 474 | seq = read_seqcount_begin(&tk_core.seq); |
John Stultz | 1ff3c96 | 2012-05-03 12:43:40 -0700 | [diff] [blame] | 475 | |
John Stultz | 7d489d1 | 2014-07-16 21:04:01 +0000 | [diff] [blame] | 476 | ts64.tv_sec = tk->xtime_sec + tk->tai_offset; |
John Stultz | 1ff3c96 | 2012-05-03 12:43:40 -0700 | [diff] [blame] | 477 | nsecs = timekeeping_get_ns(tk); |
| 478 | |
Thomas Gleixner | 3fdb14f | 2014-07-16 21:04:07 +0000 | [diff] [blame] | 479 | } while (read_seqcount_retry(&tk_core.seq, seq)); |
John Stultz | 1ff3c96 | 2012-05-03 12:43:40 -0700 | [diff] [blame] | 480 | |
John Stultz | 7d489d1 | 2014-07-16 21:04:01 +0000 | [diff] [blame] | 481 | ts64.tv_nsec = 0; |
| 482 | timespec64_add_ns(&ts64, nsecs); |
| 483 | *ts = timespec64_to_timespec(ts64); |
John Stultz | 1ff3c96 | 2012-05-03 12:43:40 -0700 | [diff] [blame] | 484 | |
| 485 | } |
| 486 | EXPORT_SYMBOL(timekeeping_clocktai); |
| 487 | |
| 488 | |
John Stultz | 90adda9 | 2013-01-21 17:00:11 -0800 | [diff] [blame] | 489 | /** |
| 490 | * ktime_get_clocktai - Returns the TAI time of day in a ktime |
| 491 | * |
| 492 | * Returns the time of day in a ktime. |
| 493 | */ |
| 494 | ktime_t ktime_get_clocktai(void) |
| 495 | { |
| 496 | struct timespec ts; |
| 497 | |
| 498 | timekeeping_clocktai(&ts); |
| 499 | return timespec_to_ktime(ts); |
| 500 | } |
| 501 | EXPORT_SYMBOL(ktime_get_clocktai); |
| 502 | |
Alexander Gordeev | e2c18e4 | 2011-01-12 17:00:57 -0800 | [diff] [blame] | 503 | #ifdef CONFIG_NTP_PPS |
| 504 | |
| 505 | /** |
| 506 | * getnstime_raw_and_real - get day and raw monotonic time in timespec format |
| 507 | * @ts_raw: pointer to the timespec to be set to raw monotonic time |
| 508 | * @ts_real: pointer to the timespec to be set to the time of day |
| 509 | * |
| 510 | * This function reads both the time of day and raw monotonic time at the |
| 511 | * same time atomically and stores the resulting timestamps in timespec |
| 512 | * format. |
| 513 | */ |
| 514 | void getnstime_raw_and_real(struct timespec *ts_raw, struct timespec *ts_real) |
| 515 | { |
Thomas Gleixner | 3fdb14f | 2014-07-16 21:04:07 +0000 | [diff] [blame] | 516 | struct timekeeper *tk = &tk_core.timekeeper; |
Alexander Gordeev | e2c18e4 | 2011-01-12 17:00:57 -0800 | [diff] [blame] | 517 | unsigned long seq; |
| 518 | s64 nsecs_raw, nsecs_real; |
| 519 | |
| 520 | WARN_ON_ONCE(timekeeping_suspended); |
| 521 | |
| 522 | do { |
Thomas Gleixner | 3fdb14f | 2014-07-16 21:04:07 +0000 | [diff] [blame] | 523 | seq = read_seqcount_begin(&tk_core.seq); |
Alexander Gordeev | e2c18e4 | 2011-01-12 17:00:57 -0800 | [diff] [blame] | 524 | |
John Stultz | 7d489d1 | 2014-07-16 21:04:01 +0000 | [diff] [blame] | 525 | *ts_raw = timespec64_to_timespec(tk->raw_time); |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 526 | ts_real->tv_sec = tk->xtime_sec; |
John Stultz | 1e75fa8 | 2012-07-13 01:21:53 -0400 | [diff] [blame] | 527 | ts_real->tv_nsec = 0; |
Alexander Gordeev | e2c18e4 | 2011-01-12 17:00:57 -0800 | [diff] [blame] | 528 | |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 529 | nsecs_raw = timekeeping_get_ns_raw(tk); |
| 530 | nsecs_real = timekeeping_get_ns(tk); |
Alexander Gordeev | e2c18e4 | 2011-01-12 17:00:57 -0800 | [diff] [blame] | 531 | |
Thomas Gleixner | 3fdb14f | 2014-07-16 21:04:07 +0000 | [diff] [blame] | 532 | } while (read_seqcount_retry(&tk_core.seq, seq)); |
Alexander Gordeev | e2c18e4 | 2011-01-12 17:00:57 -0800 | [diff] [blame] | 533 | |
| 534 | timespec_add_ns(ts_raw, nsecs_raw); |
| 535 | timespec_add_ns(ts_real, nsecs_real); |
| 536 | } |
| 537 | EXPORT_SYMBOL(getnstime_raw_and_real); |
| 538 | |
| 539 | #endif /* CONFIG_NTP_PPS */ |
| 540 | |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 541 | /** |
| 542 | * do_gettimeofday - Returns the time of day in a timeval |
| 543 | * @tv: pointer to the timeval to be set |
| 544 | * |
Geert Uytterhoeven | efd9ac8 | 2008-01-30 13:30:01 +0100 | [diff] [blame] | 545 | * NOTE: Users should be converted to using getnstimeofday() |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 546 | */ |
| 547 | void do_gettimeofday(struct timeval *tv) |
| 548 | { |
Thomas Gleixner | d6d2989 | 2014-07-16 21:04:04 +0000 | [diff] [blame] | 549 | struct timespec64 now; |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 550 | |
Thomas Gleixner | d6d2989 | 2014-07-16 21:04:04 +0000 | [diff] [blame] | 551 | getnstimeofday64(&now); |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 552 | tv->tv_sec = now.tv_sec; |
| 553 | tv->tv_usec = now.tv_nsec/1000; |
| 554 | } |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 555 | EXPORT_SYMBOL(do_gettimeofday); |
Richard Cochran | d239f49 | 2012-04-27 10:12:42 +0200 | [diff] [blame] | 556 | |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 557 | /** |
| 558 | * do_settimeofday - Sets the time of day |
| 559 | * @tv: pointer to the timespec variable containing the new time |
| 560 | * |
| 561 | * Sets the time of day to the new time and update NTP and notify hrtimers |
| 562 | */ |
Richard Cochran | 1e6d767 | 2011-02-01 13:50:58 +0000 | [diff] [blame] | 563 | int do_settimeofday(const struct timespec *tv) |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 564 | { |
Thomas Gleixner | 3fdb14f | 2014-07-16 21:04:07 +0000 | [diff] [blame] | 565 | struct timekeeper *tk = &tk_core.timekeeper; |
John Stultz | 7d489d1 | 2014-07-16 21:04:01 +0000 | [diff] [blame] | 566 | struct timespec64 ts_delta, xt, tmp; |
John Stultz | 92c1d3e | 2011-11-14 14:05:44 -0800 | [diff] [blame] | 567 | unsigned long flags; |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 568 | |
John Stultz | cee5848 | 2012-08-31 13:30:06 -0400 | [diff] [blame] | 569 | if (!timespec_valid_strict(tv)) |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 570 | return -EINVAL; |
| 571 | |
Thomas Gleixner | 9a7a71b | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 572 | raw_spin_lock_irqsave(&timekeeper_lock, flags); |
Thomas Gleixner | 3fdb14f | 2014-07-16 21:04:07 +0000 | [diff] [blame] | 573 | write_seqcount_begin(&tk_core.seq); |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 574 | |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 575 | timekeeping_forward_now(tk); |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 576 | |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 577 | xt = tk_xtime(tk); |
John Stultz | 1e75fa8 | 2012-07-13 01:21:53 -0400 | [diff] [blame] | 578 | ts_delta.tv_sec = tv->tv_sec - xt.tv_sec; |
| 579 | ts_delta.tv_nsec = tv->tv_nsec - xt.tv_nsec; |
| 580 | |
John Stultz | 7d489d1 | 2014-07-16 21:04:01 +0000 | [diff] [blame] | 581 | tk_set_wall_to_mono(tk, timespec64_sub(tk->wall_to_monotonic, ts_delta)); |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 582 | |
John Stultz | 7d489d1 | 2014-07-16 21:04:01 +0000 | [diff] [blame] | 583 | tmp = timespec_to_timespec64(*tv); |
| 584 | tk_set_xtime(tk, &tmp); |
John Stultz | 1e75fa8 | 2012-07-13 01:21:53 -0400 | [diff] [blame] | 585 | |
David Vrabel | 780427f | 2013-06-27 11:35:46 +0100 | [diff] [blame] | 586 | timekeeping_update(tk, TK_CLEAR_NTP | TK_MIRROR | TK_CLOCK_WAS_SET); |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 587 | |
Thomas Gleixner | 3fdb14f | 2014-07-16 21:04:07 +0000 | [diff] [blame] | 588 | write_seqcount_end(&tk_core.seq); |
Thomas Gleixner | 9a7a71b | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 589 | raw_spin_unlock_irqrestore(&timekeeper_lock, flags); |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 590 | |
| 591 | /* signal hrtimers about time change */ |
| 592 | clock_was_set(); |
| 593 | |
| 594 | return 0; |
| 595 | } |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 596 | EXPORT_SYMBOL(do_settimeofday); |
| 597 | |
John Stultz | c528f7c | 2011-02-01 13:52:17 +0000 | [diff] [blame] | 598 | /** |
| 599 | * timekeeping_inject_offset - Adds or subtracts from the current time. |
| 600 | * @tv: pointer to the timespec variable containing the offset |
| 601 | * |
| 602 | * Adds or subtracts an offset value from the current time. |
| 603 | */ |
| 604 | int timekeeping_inject_offset(struct timespec *ts) |
| 605 | { |
Thomas Gleixner | 3fdb14f | 2014-07-16 21:04:07 +0000 | [diff] [blame] | 606 | struct timekeeper *tk = &tk_core.timekeeper; |
John Stultz | 92c1d3e | 2011-11-14 14:05:44 -0800 | [diff] [blame] | 607 | unsigned long flags; |
John Stultz | 7d489d1 | 2014-07-16 21:04:01 +0000 | [diff] [blame] | 608 | struct timespec64 ts64, tmp; |
John Stultz | 4e8b145 | 2012-08-08 15:36:20 -0400 | [diff] [blame] | 609 | int ret = 0; |
John Stultz | c528f7c | 2011-02-01 13:52:17 +0000 | [diff] [blame] | 610 | |
| 611 | if ((unsigned long)ts->tv_nsec >= NSEC_PER_SEC) |
| 612 | return -EINVAL; |
| 613 | |
John Stultz | 7d489d1 | 2014-07-16 21:04:01 +0000 | [diff] [blame] | 614 | ts64 = timespec_to_timespec64(*ts); |
| 615 | |
Thomas Gleixner | 9a7a71b | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 616 | raw_spin_lock_irqsave(&timekeeper_lock, flags); |
Thomas Gleixner | 3fdb14f | 2014-07-16 21:04:07 +0000 | [diff] [blame] | 617 | write_seqcount_begin(&tk_core.seq); |
John Stultz | c528f7c | 2011-02-01 13:52:17 +0000 | [diff] [blame] | 618 | |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 619 | timekeeping_forward_now(tk); |
John Stultz | c528f7c | 2011-02-01 13:52:17 +0000 | [diff] [blame] | 620 | |
John Stultz | 4e8b145 | 2012-08-08 15:36:20 -0400 | [diff] [blame] | 621 | /* Make sure the proposed value is valid */ |
John Stultz | 7d489d1 | 2014-07-16 21:04:01 +0000 | [diff] [blame] | 622 | tmp = timespec64_add(tk_xtime(tk), ts64); |
| 623 | if (!timespec64_valid_strict(&tmp)) { |
John Stultz | 4e8b145 | 2012-08-08 15:36:20 -0400 | [diff] [blame] | 624 | ret = -EINVAL; |
| 625 | goto error; |
| 626 | } |
John Stultz | 1e75fa8 | 2012-07-13 01:21:53 -0400 | [diff] [blame] | 627 | |
John Stultz | 7d489d1 | 2014-07-16 21:04:01 +0000 | [diff] [blame] | 628 | tk_xtime_add(tk, &ts64); |
| 629 | tk_set_wall_to_mono(tk, timespec64_sub(tk->wall_to_monotonic, ts64)); |
John Stultz | c528f7c | 2011-02-01 13:52:17 +0000 | [diff] [blame] | 630 | |
John Stultz | 4e8b145 | 2012-08-08 15:36:20 -0400 | [diff] [blame] | 631 | error: /* even if we error out, we forwarded the time, so call update */ |
David Vrabel | 780427f | 2013-06-27 11:35:46 +0100 | [diff] [blame] | 632 | timekeeping_update(tk, TK_CLEAR_NTP | TK_MIRROR | TK_CLOCK_WAS_SET); |
John Stultz | c528f7c | 2011-02-01 13:52:17 +0000 | [diff] [blame] | 633 | |
Thomas Gleixner | 3fdb14f | 2014-07-16 21:04:07 +0000 | [diff] [blame] | 634 | write_seqcount_end(&tk_core.seq); |
Thomas Gleixner | 9a7a71b | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 635 | raw_spin_unlock_irqrestore(&timekeeper_lock, flags); |
John Stultz | c528f7c | 2011-02-01 13:52:17 +0000 | [diff] [blame] | 636 | |
| 637 | /* signal hrtimers about time change */ |
| 638 | clock_was_set(); |
| 639 | |
John Stultz | 4e8b145 | 2012-08-08 15:36:20 -0400 | [diff] [blame] | 640 | return ret; |
John Stultz | c528f7c | 2011-02-01 13:52:17 +0000 | [diff] [blame] | 641 | } |
| 642 | EXPORT_SYMBOL(timekeeping_inject_offset); |
| 643 | |
John Stultz | cc244dd | 2012-05-03 12:30:07 -0700 | [diff] [blame] | 644 | |
| 645 | /** |
| 646 | * timekeeping_get_tai_offset - Returns current TAI offset from UTC |
| 647 | * |
| 648 | */ |
| 649 | s32 timekeeping_get_tai_offset(void) |
| 650 | { |
Thomas Gleixner | 3fdb14f | 2014-07-16 21:04:07 +0000 | [diff] [blame] | 651 | struct timekeeper *tk = &tk_core.timekeeper; |
John Stultz | cc244dd | 2012-05-03 12:30:07 -0700 | [diff] [blame] | 652 | unsigned int seq; |
| 653 | s32 ret; |
| 654 | |
| 655 | do { |
Thomas Gleixner | 3fdb14f | 2014-07-16 21:04:07 +0000 | [diff] [blame] | 656 | seq = read_seqcount_begin(&tk_core.seq); |
John Stultz | cc244dd | 2012-05-03 12:30:07 -0700 | [diff] [blame] | 657 | ret = tk->tai_offset; |
Thomas Gleixner | 3fdb14f | 2014-07-16 21:04:07 +0000 | [diff] [blame] | 658 | } while (read_seqcount_retry(&tk_core.seq, seq)); |
John Stultz | cc244dd | 2012-05-03 12:30:07 -0700 | [diff] [blame] | 659 | |
| 660 | return ret; |
| 661 | } |
| 662 | |
| 663 | /** |
| 664 | * __timekeeping_set_tai_offset - Lock free worker function |
| 665 | * |
| 666 | */ |
Fengguang Wu | dd5d70e | 2013-03-25 12:24:24 -0700 | [diff] [blame] | 667 | static void __timekeeping_set_tai_offset(struct timekeeper *tk, s32 tai_offset) |
John Stultz | cc244dd | 2012-05-03 12:30:07 -0700 | [diff] [blame] | 668 | { |
| 669 | tk->tai_offset = tai_offset; |
John Stultz | 04005f6 | 2013-12-10 17:13:35 -0800 | [diff] [blame] | 670 | tk->offs_tai = ktime_add(tk->offs_real, ktime_set(tai_offset, 0)); |
John Stultz | cc244dd | 2012-05-03 12:30:07 -0700 | [diff] [blame] | 671 | } |
| 672 | |
| 673 | /** |
| 674 | * timekeeping_set_tai_offset - Sets the current TAI offset from UTC |
| 675 | * |
| 676 | */ |
| 677 | void timekeeping_set_tai_offset(s32 tai_offset) |
| 678 | { |
Thomas Gleixner | 3fdb14f | 2014-07-16 21:04:07 +0000 | [diff] [blame] | 679 | struct timekeeper *tk = &tk_core.timekeeper; |
John Stultz | cc244dd | 2012-05-03 12:30:07 -0700 | [diff] [blame] | 680 | unsigned long flags; |
| 681 | |
Thomas Gleixner | 9a7a71b | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 682 | raw_spin_lock_irqsave(&timekeeper_lock, flags); |
Thomas Gleixner | 3fdb14f | 2014-07-16 21:04:07 +0000 | [diff] [blame] | 683 | write_seqcount_begin(&tk_core.seq); |
John Stultz | cc244dd | 2012-05-03 12:30:07 -0700 | [diff] [blame] | 684 | __timekeeping_set_tai_offset(tk, tai_offset); |
John Stultz | f55c076 | 2013-12-11 18:50:25 -0800 | [diff] [blame] | 685 | timekeeping_update(tk, TK_MIRROR | TK_CLOCK_WAS_SET); |
Thomas Gleixner | 3fdb14f | 2014-07-16 21:04:07 +0000 | [diff] [blame] | 686 | write_seqcount_end(&tk_core.seq); |
Thomas Gleixner | 9a7a71b | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 687 | raw_spin_unlock_irqrestore(&timekeeper_lock, flags); |
John Stultz | 4e8f8b3 | 2013-04-10 12:41:49 -0700 | [diff] [blame] | 688 | clock_was_set(); |
John Stultz | cc244dd | 2012-05-03 12:30:07 -0700 | [diff] [blame] | 689 | } |
| 690 | |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 691 | /** |
| 692 | * change_clocksource - Swaps clocksources if a new one is available |
| 693 | * |
| 694 | * Accumulates current time interval and initializes new clocksource |
| 695 | */ |
Martin Schwidefsky | 75c5158 | 2009-08-14 15:47:30 +0200 | [diff] [blame] | 696 | static int change_clocksource(void *data) |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 697 | { |
Thomas Gleixner | 3fdb14f | 2014-07-16 21:04:07 +0000 | [diff] [blame] | 698 | struct timekeeper *tk = &tk_core.timekeeper; |
Magnus Damm | 4614e6a | 2009-04-21 12:24:02 -0700 | [diff] [blame] | 699 | struct clocksource *new, *old; |
John Stultz | f695cf9 | 2012-03-14 16:38:15 -0700 | [diff] [blame] | 700 | unsigned long flags; |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 701 | |
Martin Schwidefsky | 75c5158 | 2009-08-14 15:47:30 +0200 | [diff] [blame] | 702 | new = (struct clocksource *) data; |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 703 | |
Thomas Gleixner | 9a7a71b | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 704 | raw_spin_lock_irqsave(&timekeeper_lock, flags); |
Thomas Gleixner | 3fdb14f | 2014-07-16 21:04:07 +0000 | [diff] [blame] | 705 | write_seqcount_begin(&tk_core.seq); |
John Stultz | f695cf9 | 2012-03-14 16:38:15 -0700 | [diff] [blame] | 706 | |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 707 | timekeeping_forward_now(tk); |
Thomas Gleixner | 09ac369 | 2013-04-25 20:31:44 +0000 | [diff] [blame] | 708 | /* |
| 709 | * If the cs is in module, get a module reference. Succeeds |
| 710 | * for built-in code (owner == NULL) as well. |
| 711 | */ |
| 712 | if (try_module_get(new->owner)) { |
| 713 | if (!new->enable || new->enable(new) == 0) { |
| 714 | old = tk->clock; |
| 715 | tk_setup_internals(tk, new); |
| 716 | if (old->disable) |
| 717 | old->disable(old); |
| 718 | module_put(old->owner); |
| 719 | } else { |
| 720 | module_put(new->owner); |
| 721 | } |
Martin Schwidefsky | 75c5158 | 2009-08-14 15:47:30 +0200 | [diff] [blame] | 722 | } |
David Vrabel | 780427f | 2013-06-27 11:35:46 +0100 | [diff] [blame] | 723 | timekeeping_update(tk, TK_CLEAR_NTP | TK_MIRROR | TK_CLOCK_WAS_SET); |
John Stultz | f695cf9 | 2012-03-14 16:38:15 -0700 | [diff] [blame] | 724 | |
Thomas Gleixner | 3fdb14f | 2014-07-16 21:04:07 +0000 | [diff] [blame] | 725 | write_seqcount_end(&tk_core.seq); |
Thomas Gleixner | 9a7a71b | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 726 | raw_spin_unlock_irqrestore(&timekeeper_lock, flags); |
John Stultz | f695cf9 | 2012-03-14 16:38:15 -0700 | [diff] [blame] | 727 | |
Martin Schwidefsky | 75c5158 | 2009-08-14 15:47:30 +0200 | [diff] [blame] | 728 | return 0; |
| 729 | } |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 730 | |
Martin Schwidefsky | 75c5158 | 2009-08-14 15:47:30 +0200 | [diff] [blame] | 731 | /** |
| 732 | * timekeeping_notify - Install a new clock source |
| 733 | * @clock: pointer to the clock source |
| 734 | * |
| 735 | * This function is called from clocksource.c after a new, better clock |
| 736 | * source has been registered. The caller holds the clocksource_mutex. |
| 737 | */ |
Thomas Gleixner | ba919d1 | 2013-04-25 20:31:44 +0000 | [diff] [blame] | 738 | int timekeeping_notify(struct clocksource *clock) |
Martin Schwidefsky | 75c5158 | 2009-08-14 15:47:30 +0200 | [diff] [blame] | 739 | { |
Thomas Gleixner | 3fdb14f | 2014-07-16 21:04:07 +0000 | [diff] [blame] | 740 | struct timekeeper *tk = &tk_core.timekeeper; |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 741 | |
| 742 | if (tk->clock == clock) |
Thomas Gleixner | ba919d1 | 2013-04-25 20:31:44 +0000 | [diff] [blame] | 743 | return 0; |
Martin Schwidefsky | 75c5158 | 2009-08-14 15:47:30 +0200 | [diff] [blame] | 744 | stop_machine(change_clocksource, clock, NULL); |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 745 | tick_clock_notify(); |
Thomas Gleixner | ba919d1 | 2013-04-25 20:31:44 +0000 | [diff] [blame] | 746 | return tk->clock == clock ? 0 : -1; |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 747 | } |
Martin Schwidefsky | 75c5158 | 2009-08-14 15:47:30 +0200 | [diff] [blame] | 748 | |
Thomas Gleixner | a40f262 | 2009-07-07 13:00:31 +0200 | [diff] [blame] | 749 | /** |
| 750 | * ktime_get_real - get the real (wall-) time in ktime_t format |
| 751 | * |
| 752 | * returns the time in ktime_t format |
| 753 | */ |
| 754 | ktime_t ktime_get_real(void) |
| 755 | { |
Thomas Gleixner | d6d2989 | 2014-07-16 21:04:04 +0000 | [diff] [blame] | 756 | struct timespec64 now; |
Thomas Gleixner | a40f262 | 2009-07-07 13:00:31 +0200 | [diff] [blame] | 757 | |
Thomas Gleixner | d6d2989 | 2014-07-16 21:04:04 +0000 | [diff] [blame] | 758 | getnstimeofday64(&now); |
Thomas Gleixner | a40f262 | 2009-07-07 13:00:31 +0200 | [diff] [blame] | 759 | |
Thomas Gleixner | d6d2989 | 2014-07-16 21:04:04 +0000 | [diff] [blame] | 760 | return timespec64_to_ktime(now); |
Thomas Gleixner | a40f262 | 2009-07-07 13:00:31 +0200 | [diff] [blame] | 761 | } |
| 762 | EXPORT_SYMBOL_GPL(ktime_get_real); |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 763 | |
| 764 | /** |
John Stultz | 2d42244 | 2008-08-20 16:37:30 -0700 | [diff] [blame] | 765 | * getrawmonotonic - Returns the raw monotonic time in a timespec |
| 766 | * @ts: pointer to the timespec to be set |
| 767 | * |
| 768 | * Returns the raw monotonic time (completely un-modified by ntp) |
| 769 | */ |
| 770 | void getrawmonotonic(struct timespec *ts) |
| 771 | { |
Thomas Gleixner | 3fdb14f | 2014-07-16 21:04:07 +0000 | [diff] [blame] | 772 | struct timekeeper *tk = &tk_core.timekeeper; |
John Stultz | 7d489d1 | 2014-07-16 21:04:01 +0000 | [diff] [blame] | 773 | struct timespec64 ts64; |
John Stultz | 2d42244 | 2008-08-20 16:37:30 -0700 | [diff] [blame] | 774 | unsigned long seq; |
| 775 | s64 nsecs; |
John Stultz | 2d42244 | 2008-08-20 16:37:30 -0700 | [diff] [blame] | 776 | |
| 777 | do { |
Thomas Gleixner | 3fdb14f | 2014-07-16 21:04:07 +0000 | [diff] [blame] | 778 | seq = read_seqcount_begin(&tk_core.seq); |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 779 | nsecs = timekeeping_get_ns_raw(tk); |
John Stultz | 7d489d1 | 2014-07-16 21:04:01 +0000 | [diff] [blame] | 780 | ts64 = tk->raw_time; |
John Stultz | 2d42244 | 2008-08-20 16:37:30 -0700 | [diff] [blame] | 781 | |
Thomas Gleixner | 3fdb14f | 2014-07-16 21:04:07 +0000 | [diff] [blame] | 782 | } while (read_seqcount_retry(&tk_core.seq, seq)); |
John Stultz | 2d42244 | 2008-08-20 16:37:30 -0700 | [diff] [blame] | 783 | |
John Stultz | 7d489d1 | 2014-07-16 21:04:01 +0000 | [diff] [blame] | 784 | timespec64_add_ns(&ts64, nsecs); |
| 785 | *ts = timespec64_to_timespec(ts64); |
John Stultz | 2d42244 | 2008-08-20 16:37:30 -0700 | [diff] [blame] | 786 | } |
| 787 | EXPORT_SYMBOL(getrawmonotonic); |
| 788 | |
John Stultz | 2d42244 | 2008-08-20 16:37:30 -0700 | [diff] [blame] | 789 | /** |
Li Zefan | cf4fc6c | 2008-02-08 04:19:24 -0800 | [diff] [blame] | 790 | * timekeeping_valid_for_hres - Check if timekeeping is suitable for hres |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 791 | */ |
Li Zefan | cf4fc6c | 2008-02-08 04:19:24 -0800 | [diff] [blame] | 792 | int timekeeping_valid_for_hres(void) |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 793 | { |
Thomas Gleixner | 3fdb14f | 2014-07-16 21:04:07 +0000 | [diff] [blame] | 794 | struct timekeeper *tk = &tk_core.timekeeper; |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 795 | unsigned long seq; |
| 796 | int ret; |
| 797 | |
| 798 | do { |
Thomas Gleixner | 3fdb14f | 2014-07-16 21:04:07 +0000 | [diff] [blame] | 799 | seq = read_seqcount_begin(&tk_core.seq); |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 800 | |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 801 | ret = tk->clock->flags & CLOCK_SOURCE_VALID_FOR_HRES; |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 802 | |
Thomas Gleixner | 3fdb14f | 2014-07-16 21:04:07 +0000 | [diff] [blame] | 803 | } while (read_seqcount_retry(&tk_core.seq, seq)); |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 804 | |
| 805 | return ret; |
| 806 | } |
| 807 | |
| 808 | /** |
Jon Hunter | 9896246 | 2009-08-18 12:45:10 -0500 | [diff] [blame] | 809 | * timekeeping_max_deferment - Returns max time the clocksource can be deferred |
Jon Hunter | 9896246 | 2009-08-18 12:45:10 -0500 | [diff] [blame] | 810 | */ |
| 811 | u64 timekeeping_max_deferment(void) |
| 812 | { |
Thomas Gleixner | 3fdb14f | 2014-07-16 21:04:07 +0000 | [diff] [blame] | 813 | struct timekeeper *tk = &tk_core.timekeeper; |
John Stultz | 70471f2 | 2011-11-14 12:48:10 -0800 | [diff] [blame] | 814 | unsigned long seq; |
| 815 | u64 ret; |
John Stultz | 42e71e8 | 2012-07-13 01:21:51 -0400 | [diff] [blame] | 816 | |
John Stultz | 70471f2 | 2011-11-14 12:48:10 -0800 | [diff] [blame] | 817 | do { |
Thomas Gleixner | 3fdb14f | 2014-07-16 21:04:07 +0000 | [diff] [blame] | 818 | seq = read_seqcount_begin(&tk_core.seq); |
John Stultz | 70471f2 | 2011-11-14 12:48:10 -0800 | [diff] [blame] | 819 | |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 820 | ret = tk->clock->max_idle_ns; |
John Stultz | 70471f2 | 2011-11-14 12:48:10 -0800 | [diff] [blame] | 821 | |
Thomas Gleixner | 3fdb14f | 2014-07-16 21:04:07 +0000 | [diff] [blame] | 822 | } while (read_seqcount_retry(&tk_core.seq, seq)); |
John Stultz | 70471f2 | 2011-11-14 12:48:10 -0800 | [diff] [blame] | 823 | |
| 824 | return ret; |
Jon Hunter | 9896246 | 2009-08-18 12:45:10 -0500 | [diff] [blame] | 825 | } |
| 826 | |
| 827 | /** |
Martin Schwidefsky | d4f587c | 2009-08-14 15:47:31 +0200 | [diff] [blame] | 828 | * read_persistent_clock - Return time from the persistent clock. |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 829 | * |
| 830 | * Weak dummy function for arches that do not yet support it. |
Martin Schwidefsky | d4f587c | 2009-08-14 15:47:31 +0200 | [diff] [blame] | 831 | * Reads the time from the battery backed persistent clock. |
| 832 | * 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] | 833 | * |
| 834 | * XXX - Do be sure to remove it once all arches implement it. |
| 835 | */ |
Gideon Israel Dsouza | 52f5684c | 2014-04-07 15:39:20 -0700 | [diff] [blame] | 836 | void __weak read_persistent_clock(struct timespec *ts) |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 837 | { |
Martin Schwidefsky | d4f587c | 2009-08-14 15:47:31 +0200 | [diff] [blame] | 838 | ts->tv_sec = 0; |
| 839 | ts->tv_nsec = 0; |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 840 | } |
| 841 | |
Martin Schwidefsky | 23970e3 | 2009-08-14 15:47:32 +0200 | [diff] [blame] | 842 | /** |
| 843 | * read_boot_clock - Return time of the system start. |
| 844 | * |
| 845 | * Weak dummy function for arches that do not yet support it. |
| 846 | * Function to read the exact time the system has been started. |
| 847 | * Returns a timespec with tv_sec=0 and tv_nsec=0 if unsupported. |
| 848 | * |
| 849 | * XXX - Do be sure to remove it once all arches implement it. |
| 850 | */ |
Gideon Israel Dsouza | 52f5684c | 2014-04-07 15:39:20 -0700 | [diff] [blame] | 851 | void __weak read_boot_clock(struct timespec *ts) |
Martin Schwidefsky | 23970e3 | 2009-08-14 15:47:32 +0200 | [diff] [blame] | 852 | { |
| 853 | ts->tv_sec = 0; |
| 854 | ts->tv_nsec = 0; |
| 855 | } |
| 856 | |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 857 | /* |
| 858 | * timekeeping_init - Initializes the clocksource and common timekeeping values |
| 859 | */ |
| 860 | void __init timekeeping_init(void) |
| 861 | { |
Thomas Gleixner | 3fdb14f | 2014-07-16 21:04:07 +0000 | [diff] [blame] | 862 | struct timekeeper *tk = &tk_core.timekeeper; |
Martin Schwidefsky | 155ec60 | 2009-08-14 15:47:26 +0200 | [diff] [blame] | 863 | struct clocksource *clock; |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 864 | unsigned long flags; |
John Stultz | 7d489d1 | 2014-07-16 21:04:01 +0000 | [diff] [blame] | 865 | struct timespec64 now, boot, tmp; |
| 866 | struct timespec ts; |
Martin Schwidefsky | d4f587c | 2009-08-14 15:47:31 +0200 | [diff] [blame] | 867 | |
John Stultz | 7d489d1 | 2014-07-16 21:04:01 +0000 | [diff] [blame] | 868 | read_persistent_clock(&ts); |
| 869 | now = timespec_to_timespec64(ts); |
| 870 | if (!timespec64_valid_strict(&now)) { |
John Stultz | 4e8b145 | 2012-08-08 15:36:20 -0400 | [diff] [blame] | 871 | pr_warn("WARNING: Persistent clock returned invalid value!\n" |
| 872 | " Check your CMOS/BIOS settings.\n"); |
| 873 | now.tv_sec = 0; |
| 874 | now.tv_nsec = 0; |
Feng Tang | 31ade30 | 2013-01-16 00:09:47 +0800 | [diff] [blame] | 875 | } else if (now.tv_sec || now.tv_nsec) |
| 876 | persistent_clock_exist = true; |
John Stultz | 4e8b145 | 2012-08-08 15:36:20 -0400 | [diff] [blame] | 877 | |
John Stultz | 7d489d1 | 2014-07-16 21:04:01 +0000 | [diff] [blame] | 878 | read_boot_clock(&ts); |
| 879 | boot = timespec_to_timespec64(ts); |
| 880 | if (!timespec64_valid_strict(&boot)) { |
John Stultz | 4e8b145 | 2012-08-08 15:36:20 -0400 | [diff] [blame] | 881 | pr_warn("WARNING: Boot clock returned invalid value!\n" |
| 882 | " Check your CMOS/BIOS settings.\n"); |
| 883 | boot.tv_sec = 0; |
| 884 | boot.tv_nsec = 0; |
| 885 | } |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 886 | |
Thomas Gleixner | 9a7a71b | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 887 | raw_spin_lock_irqsave(&timekeeper_lock, flags); |
Thomas Gleixner | 3fdb14f | 2014-07-16 21:04:07 +0000 | [diff] [blame] | 888 | write_seqcount_begin(&tk_core.seq); |
John Stultz | 06c017f | 2013-03-22 11:37:28 -0700 | [diff] [blame] | 889 | ntp_init(); |
| 890 | |
Martin Schwidefsky | f1b8274 | 2009-08-14 15:47:21 +0200 | [diff] [blame] | 891 | clock = clocksource_default_clock(); |
Martin Schwidefsky | a0f7d48 | 2009-08-14 15:47:19 +0200 | [diff] [blame] | 892 | if (clock->enable) |
| 893 | clock->enable(clock); |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 894 | tk_setup_internals(tk, clock); |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 895 | |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 896 | tk_set_xtime(tk, &now); |
| 897 | tk->raw_time.tv_sec = 0; |
| 898 | tk->raw_time.tv_nsec = 0; |
John Stultz | 1e75fa8 | 2012-07-13 01:21:53 -0400 | [diff] [blame] | 899 | if (boot.tv_sec == 0 && boot.tv_nsec == 0) |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 900 | boot = tk_xtime(tk); |
John Stultz | 1e75fa8 | 2012-07-13 01:21:53 -0400 | [diff] [blame] | 901 | |
John Stultz | 7d489d1 | 2014-07-16 21:04:01 +0000 | [diff] [blame] | 902 | set_normalized_timespec64(&tmp, -boot.tv_sec, -boot.tv_nsec); |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 903 | tk_set_wall_to_mono(tk, tmp); |
John Stultz | 6d0ef90 | 2012-07-27 14:48:12 -0400 | [diff] [blame] | 904 | |
| 905 | tmp.tv_sec = 0; |
| 906 | tmp.tv_nsec = 0; |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 907 | tk_set_sleep_time(tk, tmp); |
John Stultz | 6d0ef90 | 2012-07-27 14:48:12 -0400 | [diff] [blame] | 908 | |
Thomas Gleixner | f111adf | 2014-07-16 21:04:09 +0000 | [diff] [blame] | 909 | timekeeping_update(tk, TK_MIRROR); |
Thomas Gleixner | 48cdc13 | 2013-02-21 22:51:40 +0000 | [diff] [blame] | 910 | |
Thomas Gleixner | 3fdb14f | 2014-07-16 21:04:07 +0000 | [diff] [blame] | 911 | write_seqcount_end(&tk_core.seq); |
Thomas Gleixner | 9a7a71b | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 912 | raw_spin_unlock_irqrestore(&timekeeper_lock, flags); |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 913 | } |
| 914 | |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 915 | /* time in seconds when suspend began */ |
John Stultz | 7d489d1 | 2014-07-16 21:04:01 +0000 | [diff] [blame] | 916 | static struct timespec64 timekeeping_suspend_time; |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 917 | |
| 918 | /** |
John Stultz | 304529b | 2011-04-01 14:32:09 -0700 | [diff] [blame] | 919 | * __timekeeping_inject_sleeptime - Internal function to add sleep interval |
| 920 | * @delta: pointer to a timespec delta value |
| 921 | * |
| 922 | * Takes a timespec offset measuring a suspend interval and properly |
| 923 | * adds the sleep offset to the timekeeping variables. |
| 924 | */ |
John Stultz | f726a69 | 2012-07-13 01:21:57 -0400 | [diff] [blame] | 925 | static void __timekeeping_inject_sleeptime(struct timekeeper *tk, |
John Stultz | 7d489d1 | 2014-07-16 21:04:01 +0000 | [diff] [blame] | 926 | struct timespec64 *delta) |
John Stultz | 304529b | 2011-04-01 14:32:09 -0700 | [diff] [blame] | 927 | { |
John Stultz | 7d489d1 | 2014-07-16 21:04:01 +0000 | [diff] [blame] | 928 | if (!timespec64_valid_strict(delta)) { |
John Stultz | 6d9bcb6 | 2014-06-04 16:11:43 -0700 | [diff] [blame] | 929 | printk_deferred(KERN_WARNING |
| 930 | "__timekeeping_inject_sleeptime: Invalid " |
| 931 | "sleep delta value!\n"); |
John Stultz | cb5de2f8d | 2011-06-01 18:18:09 -0700 | [diff] [blame] | 932 | return; |
| 933 | } |
John Stultz | f726a69 | 2012-07-13 01:21:57 -0400 | [diff] [blame] | 934 | tk_xtime_add(tk, delta); |
John Stultz | 7d489d1 | 2014-07-16 21:04:01 +0000 | [diff] [blame] | 935 | tk_set_wall_to_mono(tk, timespec64_sub(tk->wall_to_monotonic, *delta)); |
| 936 | tk_set_sleep_time(tk, timespec64_add(tk->total_sleep_time, *delta)); |
Colin Cross | 5c83545 | 2013-05-21 22:32:14 -0700 | [diff] [blame] | 937 | tk_debug_account_sleep_time(delta); |
John Stultz | 304529b | 2011-04-01 14:32:09 -0700 | [diff] [blame] | 938 | } |
| 939 | |
John Stultz | 304529b | 2011-04-01 14:32:09 -0700 | [diff] [blame] | 940 | /** |
| 941 | * timekeeping_inject_sleeptime - Adds suspend interval to timeekeeping values |
| 942 | * @delta: pointer to a timespec delta value |
| 943 | * |
| 944 | * This hook is for architectures that cannot support read_persistent_clock |
| 945 | * because their RTC/persistent clock is only accessible when irqs are enabled. |
| 946 | * |
| 947 | * This function should only be called by rtc_resume(), and allows |
| 948 | * a suspend offset to be injected into the timekeeping values. |
| 949 | */ |
| 950 | void timekeeping_inject_sleeptime(struct timespec *delta) |
| 951 | { |
Thomas Gleixner | 3fdb14f | 2014-07-16 21:04:07 +0000 | [diff] [blame] | 952 | struct timekeeper *tk = &tk_core.timekeeper; |
John Stultz | 7d489d1 | 2014-07-16 21:04:01 +0000 | [diff] [blame] | 953 | struct timespec64 tmp; |
John Stultz | 92c1d3e | 2011-11-14 14:05:44 -0800 | [diff] [blame] | 954 | unsigned long flags; |
John Stultz | 304529b | 2011-04-01 14:32:09 -0700 | [diff] [blame] | 955 | |
Feng Tang | 31ade30 | 2013-01-16 00:09:47 +0800 | [diff] [blame] | 956 | /* |
| 957 | * Make sure we don't set the clock twice, as timekeeping_resume() |
| 958 | * already did it |
| 959 | */ |
| 960 | if (has_persistent_clock()) |
John Stultz | 304529b | 2011-04-01 14:32:09 -0700 | [diff] [blame] | 961 | return; |
| 962 | |
Thomas Gleixner | 9a7a71b | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 963 | raw_spin_lock_irqsave(&timekeeper_lock, flags); |
Thomas Gleixner | 3fdb14f | 2014-07-16 21:04:07 +0000 | [diff] [blame] | 964 | write_seqcount_begin(&tk_core.seq); |
John Stultz | 70471f2 | 2011-11-14 12:48:10 -0800 | [diff] [blame] | 965 | |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 966 | timekeeping_forward_now(tk); |
John Stultz | 304529b | 2011-04-01 14:32:09 -0700 | [diff] [blame] | 967 | |
John Stultz | 7d489d1 | 2014-07-16 21:04:01 +0000 | [diff] [blame] | 968 | tmp = timespec_to_timespec64(*delta); |
| 969 | __timekeeping_inject_sleeptime(tk, &tmp); |
John Stultz | 304529b | 2011-04-01 14:32:09 -0700 | [diff] [blame] | 970 | |
David Vrabel | 780427f | 2013-06-27 11:35:46 +0100 | [diff] [blame] | 971 | timekeeping_update(tk, TK_CLEAR_NTP | TK_MIRROR | TK_CLOCK_WAS_SET); |
John Stultz | 304529b | 2011-04-01 14:32:09 -0700 | [diff] [blame] | 972 | |
Thomas Gleixner | 3fdb14f | 2014-07-16 21:04:07 +0000 | [diff] [blame] | 973 | write_seqcount_end(&tk_core.seq); |
Thomas Gleixner | 9a7a71b | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 974 | raw_spin_unlock_irqrestore(&timekeeper_lock, flags); |
John Stultz | 304529b | 2011-04-01 14:32:09 -0700 | [diff] [blame] | 975 | |
| 976 | /* signal hrtimers about time change */ |
| 977 | clock_was_set(); |
| 978 | } |
| 979 | |
John Stultz | 304529b | 2011-04-01 14:32:09 -0700 | [diff] [blame] | 980 | /** |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 981 | * timekeeping_resume - Resumes the generic timekeeping subsystem. |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 982 | * |
| 983 | * This is for the generic clocksource timekeeping. |
| 984 | * xtime/wall_to_monotonic/jiffies/etc are |
| 985 | * still managed by arch specific suspend/resume code. |
| 986 | */ |
Rafael J. Wysocki | e1a85b2 | 2011-03-23 22:16:04 +0100 | [diff] [blame] | 987 | static void timekeeping_resume(void) |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 988 | { |
Thomas Gleixner | 3fdb14f | 2014-07-16 21:04:07 +0000 | [diff] [blame] | 989 | struct timekeeper *tk = &tk_core.timekeeper; |
Feng Tang | e445cf1 | 2013-03-12 11:56:48 +0800 | [diff] [blame] | 990 | struct clocksource *clock = tk->clock; |
John Stultz | 92c1d3e | 2011-11-14 14:05:44 -0800 | [diff] [blame] | 991 | unsigned long flags; |
John Stultz | 7d489d1 | 2014-07-16 21:04:01 +0000 | [diff] [blame] | 992 | struct timespec64 ts_new, ts_delta; |
| 993 | struct timespec tmp; |
Feng Tang | e445cf1 | 2013-03-12 11:56:48 +0800 | [diff] [blame] | 994 | cycle_t cycle_now, cycle_delta; |
| 995 | bool suspendtime_found = false; |
Martin Schwidefsky | d4f587c | 2009-08-14 15:47:31 +0200 | [diff] [blame] | 996 | |
John Stultz | 7d489d1 | 2014-07-16 21:04:01 +0000 | [diff] [blame] | 997 | read_persistent_clock(&tmp); |
| 998 | ts_new = timespec_to_timespec64(tmp); |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 999 | |
Rafael J. Wysocki | adc78e6 | 2012-08-06 01:40:41 +0200 | [diff] [blame] | 1000 | clockevents_resume(); |
Thomas Gleixner | d10ff3f | 2007-05-14 11:10:02 +0200 | [diff] [blame] | 1001 | clocksource_resume(); |
| 1002 | |
Thomas Gleixner | 9a7a71b | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 1003 | raw_spin_lock_irqsave(&timekeeper_lock, flags); |
Thomas Gleixner | 3fdb14f | 2014-07-16 21:04:07 +0000 | [diff] [blame] | 1004 | write_seqcount_begin(&tk_core.seq); |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 1005 | |
Feng Tang | e445cf1 | 2013-03-12 11:56:48 +0800 | [diff] [blame] | 1006 | /* |
| 1007 | * After system resumes, we need to calculate the suspended time and |
| 1008 | * compensate it for the OS time. There are 3 sources that could be |
| 1009 | * used: Nonstop clocksource during suspend, persistent clock and rtc |
| 1010 | * device. |
| 1011 | * |
| 1012 | * One specific platform may have 1 or 2 or all of them, and the |
| 1013 | * preference will be: |
| 1014 | * suspend-nonstop clocksource -> persistent clock -> rtc |
| 1015 | * The less preferred source will only be tried if there is no better |
| 1016 | * usable source. The rtc part is handled separately in rtc core code. |
| 1017 | */ |
| 1018 | cycle_now = clock->read(clock); |
| 1019 | if ((clock->flags & CLOCK_SOURCE_SUSPEND_NONSTOP) && |
| 1020 | cycle_now > clock->cycle_last) { |
| 1021 | u64 num, max = ULLONG_MAX; |
| 1022 | u32 mult = clock->mult; |
| 1023 | u32 shift = clock->shift; |
| 1024 | s64 nsec = 0; |
| 1025 | |
| 1026 | cycle_delta = (cycle_now - clock->cycle_last) & clock->mask; |
| 1027 | |
| 1028 | /* |
| 1029 | * "cycle_delta * mutl" may cause 64 bits overflow, if the |
| 1030 | * suspended time is too long. In that case we need do the |
| 1031 | * 64 bits math carefully |
| 1032 | */ |
| 1033 | do_div(max, mult); |
| 1034 | if (cycle_delta > max) { |
| 1035 | num = div64_u64(cycle_delta, max); |
| 1036 | nsec = (((u64) max * mult) >> shift) * num; |
| 1037 | cycle_delta -= num * max; |
| 1038 | } |
| 1039 | nsec += ((u64) cycle_delta * mult) >> shift; |
| 1040 | |
John Stultz | 7d489d1 | 2014-07-16 21:04:01 +0000 | [diff] [blame] | 1041 | ts_delta = ns_to_timespec64(nsec); |
Feng Tang | e445cf1 | 2013-03-12 11:56:48 +0800 | [diff] [blame] | 1042 | suspendtime_found = true; |
John Stultz | 7d489d1 | 2014-07-16 21:04:01 +0000 | [diff] [blame] | 1043 | } else if (timespec64_compare(&ts_new, &timekeeping_suspend_time) > 0) { |
| 1044 | ts_delta = timespec64_sub(ts_new, timekeeping_suspend_time); |
Feng Tang | e445cf1 | 2013-03-12 11:56:48 +0800 | [diff] [blame] | 1045 | suspendtime_found = true; |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 1046 | } |
Feng Tang | e445cf1 | 2013-03-12 11:56:48 +0800 | [diff] [blame] | 1047 | |
| 1048 | if (suspendtime_found) |
| 1049 | __timekeeping_inject_sleeptime(tk, &ts_delta); |
| 1050 | |
| 1051 | /* Re-base the last cycle value */ |
Thomas Gleixner | 77c675b | 2013-04-22 09:37:04 +0200 | [diff] [blame] | 1052 | tk->cycle_last = clock->cycle_last = cycle_now; |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 1053 | tk->ntp_error = 0; |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 1054 | timekeeping_suspended = 0; |
David Vrabel | 780427f | 2013-06-27 11:35:46 +0100 | [diff] [blame] | 1055 | timekeeping_update(tk, TK_MIRROR | TK_CLOCK_WAS_SET); |
Thomas Gleixner | 3fdb14f | 2014-07-16 21:04:07 +0000 | [diff] [blame] | 1056 | write_seqcount_end(&tk_core.seq); |
Thomas Gleixner | 9a7a71b | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 1057 | raw_spin_unlock_irqrestore(&timekeeper_lock, flags); |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 1058 | |
| 1059 | touch_softlockup_watchdog(); |
| 1060 | |
| 1061 | clockevents_notify(CLOCK_EVT_NOTIFY_RESUME, NULL); |
| 1062 | |
| 1063 | /* Resume hrtimers */ |
Thomas Gleixner | b12a03c | 2011-05-02 16:48:57 +0200 | [diff] [blame] | 1064 | hrtimers_resume(); |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 1065 | } |
| 1066 | |
Rafael J. Wysocki | e1a85b2 | 2011-03-23 22:16:04 +0100 | [diff] [blame] | 1067 | static int timekeeping_suspend(void) |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 1068 | { |
Thomas Gleixner | 3fdb14f | 2014-07-16 21:04:07 +0000 | [diff] [blame] | 1069 | struct timekeeper *tk = &tk_core.timekeeper; |
John Stultz | 92c1d3e | 2011-11-14 14:05:44 -0800 | [diff] [blame] | 1070 | unsigned long flags; |
John Stultz | 7d489d1 | 2014-07-16 21:04:01 +0000 | [diff] [blame] | 1071 | struct timespec64 delta, delta_delta; |
| 1072 | static struct timespec64 old_delta; |
| 1073 | struct timespec tmp; |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 1074 | |
John Stultz | 7d489d1 | 2014-07-16 21:04:01 +0000 | [diff] [blame] | 1075 | read_persistent_clock(&tmp); |
| 1076 | timekeeping_suspend_time = timespec_to_timespec64(tmp); |
Thomas Gleixner | 3be9095 | 2007-09-16 15:36:43 +0200 | [diff] [blame] | 1077 | |
Zoran Markovic | 0d6bd99 | 2013-05-17 11:24:05 -0700 | [diff] [blame] | 1078 | /* |
| 1079 | * On some systems the persistent_clock can not be detected at |
| 1080 | * timekeeping_init by its return value, so if we see a valid |
| 1081 | * value returned, update the persistent_clock_exists flag. |
| 1082 | */ |
| 1083 | if (timekeeping_suspend_time.tv_sec || timekeeping_suspend_time.tv_nsec) |
| 1084 | persistent_clock_exist = true; |
| 1085 | |
Thomas Gleixner | 9a7a71b | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 1086 | raw_spin_lock_irqsave(&timekeeper_lock, flags); |
Thomas Gleixner | 3fdb14f | 2014-07-16 21:04:07 +0000 | [diff] [blame] | 1087 | write_seqcount_begin(&tk_core.seq); |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 1088 | timekeeping_forward_now(tk); |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 1089 | timekeeping_suspended = 1; |
John Stultz | cb33217 | 2011-05-31 22:53:23 -0700 | [diff] [blame] | 1090 | |
| 1091 | /* |
| 1092 | * To avoid drift caused by repeated suspend/resumes, |
| 1093 | * which each can add ~1 second drift error, |
| 1094 | * try to compensate so the difference in system time |
| 1095 | * and persistent_clock time stays close to constant. |
| 1096 | */ |
John Stultz | 7d489d1 | 2014-07-16 21:04:01 +0000 | [diff] [blame] | 1097 | delta = timespec64_sub(tk_xtime(tk), timekeeping_suspend_time); |
| 1098 | delta_delta = timespec64_sub(delta, old_delta); |
John Stultz | cb33217 | 2011-05-31 22:53:23 -0700 | [diff] [blame] | 1099 | if (abs(delta_delta.tv_sec) >= 2) { |
| 1100 | /* |
| 1101 | * if delta_delta is too large, assume time correction |
| 1102 | * has occured and set old_delta to the current delta. |
| 1103 | */ |
| 1104 | old_delta = delta; |
| 1105 | } else { |
| 1106 | /* Otherwise try to adjust old_system to compensate */ |
| 1107 | timekeeping_suspend_time = |
John Stultz | 7d489d1 | 2014-07-16 21:04:01 +0000 | [diff] [blame] | 1108 | timespec64_add(timekeeping_suspend_time, delta_delta); |
John Stultz | cb33217 | 2011-05-31 22:53:23 -0700 | [diff] [blame] | 1109 | } |
John Stultz | 330a161 | 2013-12-11 19:10:36 -0800 | [diff] [blame] | 1110 | |
| 1111 | timekeeping_update(tk, TK_MIRROR); |
Thomas Gleixner | 3fdb14f | 2014-07-16 21:04:07 +0000 | [diff] [blame] | 1112 | write_seqcount_end(&tk_core.seq); |
Thomas Gleixner | 9a7a71b | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 1113 | raw_spin_unlock_irqrestore(&timekeeper_lock, flags); |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 1114 | |
| 1115 | clockevents_notify(CLOCK_EVT_NOTIFY_SUSPEND, NULL); |
Magnus Damm | c54a42b | 2010-02-02 14:41:41 -0800 | [diff] [blame] | 1116 | clocksource_suspend(); |
Rafael J. Wysocki | adc78e6 | 2012-08-06 01:40:41 +0200 | [diff] [blame] | 1117 | clockevents_suspend(); |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 1118 | |
| 1119 | return 0; |
| 1120 | } |
| 1121 | |
| 1122 | /* sysfs resume/suspend bits for timekeeping */ |
Rafael J. Wysocki | e1a85b2 | 2011-03-23 22:16:04 +0100 | [diff] [blame] | 1123 | static struct syscore_ops timekeeping_syscore_ops = { |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 1124 | .resume = timekeeping_resume, |
| 1125 | .suspend = timekeeping_suspend, |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 1126 | }; |
| 1127 | |
Rafael J. Wysocki | e1a85b2 | 2011-03-23 22:16:04 +0100 | [diff] [blame] | 1128 | static int __init timekeeping_init_ops(void) |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 1129 | { |
Rafael J. Wysocki | e1a85b2 | 2011-03-23 22:16:04 +0100 | [diff] [blame] | 1130 | register_syscore_ops(&timekeeping_syscore_ops); |
| 1131 | return 0; |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 1132 | } |
| 1133 | |
Rafael J. Wysocki | e1a85b2 | 2011-03-23 22:16:04 +0100 | [diff] [blame] | 1134 | device_initcall(timekeeping_init_ops); |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 1135 | |
| 1136 | /* |
| 1137 | * If the error is already larger, we look ahead even further |
| 1138 | * to compensate for late or lost adjustments. |
| 1139 | */ |
John Stultz | f726a69 | 2012-07-13 01:21:57 -0400 | [diff] [blame] | 1140 | static __always_inline int timekeeping_bigadjust(struct timekeeper *tk, |
| 1141 | s64 error, s64 *interval, |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 1142 | s64 *offset) |
| 1143 | { |
| 1144 | s64 tick_error, i; |
| 1145 | u32 look_ahead, adj; |
| 1146 | s32 error2, mult; |
| 1147 | |
| 1148 | /* |
| 1149 | * Use the current error value to determine how much to look ahead. |
| 1150 | * The larger the error the slower we adjust for it to avoid problems |
| 1151 | * with losing too many ticks, otherwise we would overadjust and |
| 1152 | * produce an even larger error. The smaller the adjustment the |
| 1153 | * 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] | 1154 | * 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] | 1155 | * within about 1 sec (or 2^20 nsec in 2^SHIFT_HZ ticks). |
| 1156 | */ |
John Stultz | f726a69 | 2012-07-13 01:21:57 -0400 | [diff] [blame] | 1157 | error2 = tk->ntp_error >> (NTP_SCALE_SHIFT + 22 - 2 * SHIFT_HZ); |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 1158 | error2 = abs(error2); |
| 1159 | for (look_ahead = 0; error2 > 0; look_ahead++) |
| 1160 | error2 >>= 2; |
| 1161 | |
| 1162 | /* |
| 1163 | * Now calculate the error in (1 << look_ahead) ticks, but first |
| 1164 | * remove the single look ahead already included in the error. |
| 1165 | */ |
John Stultz | f726a69 | 2012-07-13 01:21:57 -0400 | [diff] [blame] | 1166 | tick_error = ntp_tick_length() >> (tk->ntp_error_shift + 1); |
| 1167 | tick_error -= tk->xtime_interval >> 1; |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 1168 | error = ((error - tick_error) >> look_ahead) + tick_error; |
| 1169 | |
| 1170 | /* Finally calculate the adjustment shift value. */ |
| 1171 | i = *interval; |
| 1172 | mult = 1; |
| 1173 | if (error < 0) { |
| 1174 | error = -error; |
| 1175 | *interval = -*interval; |
| 1176 | *offset = -*offset; |
| 1177 | mult = -1; |
| 1178 | } |
| 1179 | for (adj = 0; error > i; adj++) |
| 1180 | error >>= 1; |
| 1181 | |
| 1182 | *interval <<= adj; |
| 1183 | *offset <<= adj; |
| 1184 | return mult << adj; |
| 1185 | } |
| 1186 | |
| 1187 | /* |
| 1188 | * Adjust the multiplier to reduce the error value, |
| 1189 | * this is optimized for the most common adjustments of -1,0,1, |
| 1190 | * for other values we can do a bit more work. |
| 1191 | */ |
John Stultz | f726a69 | 2012-07-13 01:21:57 -0400 | [diff] [blame] | 1192 | static void timekeeping_adjust(struct timekeeper *tk, s64 offset) |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 1193 | { |
John Stultz | f726a69 | 2012-07-13 01:21:57 -0400 | [diff] [blame] | 1194 | s64 error, interval = tk->cycle_interval; |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 1195 | int adj; |
| 1196 | |
John Stultz | c2bc111 | 2011-10-27 18:12:42 -0700 | [diff] [blame] | 1197 | /* |
Jim Cromie | 88b28ad | 2012-03-14 21:28:56 -0600 | [diff] [blame] | 1198 | * 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] | 1199 | * an interval. |
| 1200 | * |
| 1201 | * First we shift it down from NTP_SHIFT to clocksource->shifted nsecs. |
| 1202 | * |
| 1203 | * 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] | 1204 | * This "saves" dividing(shifting) interval twice, but keeps the |
| 1205 | * (error > interval) comparison as still measuring if error is |
Jim Cromie | 88b28ad | 2012-03-14 21:28:56 -0600 | [diff] [blame] | 1206 | * larger than half an interval. |
John Stultz | c2bc111 | 2011-10-27 18:12:42 -0700 | [diff] [blame] | 1207 | * |
John Stultz | 3f86f28 | 2011-10-27 17:41:17 -0700 | [diff] [blame] | 1208 | * Note: It does not "save" on aggravation when reading the code. |
John Stultz | c2bc111 | 2011-10-27 18:12:42 -0700 | [diff] [blame] | 1209 | */ |
John Stultz | f726a69 | 2012-07-13 01:21:57 -0400 | [diff] [blame] | 1210 | error = tk->ntp_error >> (tk->ntp_error_shift - 1); |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 1211 | if (error > interval) { |
John Stultz | c2bc111 | 2011-10-27 18:12:42 -0700 | [diff] [blame] | 1212 | /* |
| 1213 | * We now divide error by 4(via shift), which checks if |
Jim Cromie | 88b28ad | 2012-03-14 21:28:56 -0600 | [diff] [blame] | 1214 | * the error is greater than twice the interval. |
John Stultz | c2bc111 | 2011-10-27 18:12:42 -0700 | [diff] [blame] | 1215 | * If it is greater, we need a bigadjust, if its smaller, |
| 1216 | * we can adjust by 1. |
| 1217 | */ |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 1218 | error >>= 2; |
| 1219 | if (likely(error <= interval)) |
| 1220 | adj = 1; |
| 1221 | else |
Ingo Molnar | 1d17d17 | 2012-08-04 21:21:14 +0200 | [diff] [blame] | 1222 | adj = timekeeping_bigadjust(tk, error, &interval, &offset); |
| 1223 | } else { |
| 1224 | if (error < -interval) { |
| 1225 | /* See comment above, this is just switched for the negative */ |
| 1226 | error >>= 2; |
| 1227 | if (likely(error >= -interval)) { |
| 1228 | adj = -1; |
| 1229 | interval = -interval; |
| 1230 | offset = -offset; |
| 1231 | } else { |
| 1232 | adj = timekeeping_bigadjust(tk, error, &interval, &offset); |
| 1233 | } |
| 1234 | } else { |
| 1235 | goto out_adjust; |
| 1236 | } |
| 1237 | } |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 1238 | |
John Stultz | f726a69 | 2012-07-13 01:21:57 -0400 | [diff] [blame] | 1239 | if (unlikely(tk->clock->maxadj && |
| 1240 | (tk->mult + adj > tk->clock->mult + tk->clock->maxadj))) { |
John Stultz | 6d9bcb6 | 2014-06-04 16:11:43 -0700 | [diff] [blame] | 1241 | printk_deferred_once(KERN_WARNING |
John Stultz | e919cfd | 2012-03-22 19:14:46 -0700 | [diff] [blame] | 1242 | "Adjusting %s more than 11%% (%ld vs %ld)\n", |
John Stultz | f726a69 | 2012-07-13 01:21:57 -0400 | [diff] [blame] | 1243 | tk->clock->name, (long)tk->mult + adj, |
| 1244 | (long)tk->clock->mult + tk->clock->maxadj); |
John Stultz | e919cfd | 2012-03-22 19:14:46 -0700 | [diff] [blame] | 1245 | } |
John Stultz | c2bc111 | 2011-10-27 18:12:42 -0700 | [diff] [blame] | 1246 | /* |
| 1247 | * So the following can be confusing. |
| 1248 | * |
| 1249 | * To keep things simple, lets assume adj == 1 for now. |
| 1250 | * |
| 1251 | * When adj != 1, remember that the interval and offset values |
| 1252 | * have been appropriately scaled so the math is the same. |
| 1253 | * |
| 1254 | * The basic idea here is that we're increasing the multiplier |
| 1255 | * by one, this causes the xtime_interval to be incremented by |
| 1256 | * one cycle_interval. This is because: |
| 1257 | * xtime_interval = cycle_interval * mult |
| 1258 | * So if mult is being incremented by one: |
| 1259 | * xtime_interval = cycle_interval * (mult + 1) |
| 1260 | * Its the same as: |
| 1261 | * xtime_interval = (cycle_interval * mult) + cycle_interval |
| 1262 | * Which can be shortened to: |
| 1263 | * xtime_interval += cycle_interval |
| 1264 | * |
| 1265 | * So offset stores the non-accumulated cycles. Thus the current |
| 1266 | * time (in shifted nanoseconds) is: |
| 1267 | * now = (offset * adj) + xtime_nsec |
| 1268 | * Now, even though we're adjusting the clock frequency, we have |
| 1269 | * to keep time consistent. In other words, we can't jump back |
| 1270 | * in time, and we also want to avoid jumping forward in time. |
| 1271 | * |
| 1272 | * So given the same offset value, we need the time to be the same |
| 1273 | * both before and after the freq adjustment. |
| 1274 | * now = (offset * adj_1) + xtime_nsec_1 |
| 1275 | * now = (offset * adj_2) + xtime_nsec_2 |
| 1276 | * So: |
| 1277 | * (offset * adj_1) + xtime_nsec_1 = |
| 1278 | * (offset * adj_2) + xtime_nsec_2 |
| 1279 | * And we know: |
| 1280 | * adj_2 = adj_1 + 1 |
| 1281 | * So: |
| 1282 | * (offset * adj_1) + xtime_nsec_1 = |
| 1283 | * (offset * (adj_1+1)) + xtime_nsec_2 |
| 1284 | * (offset * adj_1) + xtime_nsec_1 = |
| 1285 | * (offset * adj_1) + offset + xtime_nsec_2 |
| 1286 | * Canceling the sides: |
| 1287 | * xtime_nsec_1 = offset + xtime_nsec_2 |
| 1288 | * Which gives us: |
| 1289 | * xtime_nsec_2 = xtime_nsec_1 - offset |
| 1290 | * Which simplfies to: |
| 1291 | * xtime_nsec -= offset |
| 1292 | * |
| 1293 | * XXX - TODO: Doc ntp_error calculation. |
| 1294 | */ |
John Stultz | f726a69 | 2012-07-13 01:21:57 -0400 | [diff] [blame] | 1295 | tk->mult += adj; |
| 1296 | tk->xtime_interval += interval; |
| 1297 | tk->xtime_nsec -= offset; |
| 1298 | tk->ntp_error -= (interval - offset) << tk->ntp_error_shift; |
John Stultz | 2a8c088 | 2012-07-13 01:21:56 -0400 | [diff] [blame] | 1299 | |
Ingo Molnar | 1d17d17 | 2012-08-04 21:21:14 +0200 | [diff] [blame] | 1300 | out_adjust: |
John Stultz | 2a8c088 | 2012-07-13 01:21:56 -0400 | [diff] [blame] | 1301 | /* |
| 1302 | * It may be possible that when we entered this function, xtime_nsec |
| 1303 | * was very small. Further, if we're slightly speeding the clocksource |
| 1304 | * in the code above, its possible the required corrective factor to |
| 1305 | * xtime_nsec could cause it to underflow. |
| 1306 | * |
| 1307 | * Now, since we already accumulated the second, cannot simply roll |
| 1308 | * the accumulated second back, since the NTP subsystem has been |
| 1309 | * notified via second_overflow. So instead we push xtime_nsec forward |
| 1310 | * by the amount we underflowed, and add that amount into the error. |
| 1311 | * |
| 1312 | * We'll correct this error next time through this function, when |
| 1313 | * xtime_nsec is not as small. |
| 1314 | */ |
John Stultz | f726a69 | 2012-07-13 01:21:57 -0400 | [diff] [blame] | 1315 | if (unlikely((s64)tk->xtime_nsec < 0)) { |
| 1316 | s64 neg = -(s64)tk->xtime_nsec; |
| 1317 | tk->xtime_nsec = 0; |
| 1318 | tk->ntp_error += neg << tk->ntp_error_shift; |
John Stultz | 2a8c088 | 2012-07-13 01:21:56 -0400 | [diff] [blame] | 1319 | } |
| 1320 | |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 1321 | } |
| 1322 | |
| 1323 | /** |
John Stultz | 1f4f948 | 2012-07-13 01:21:54 -0400 | [diff] [blame] | 1324 | * accumulate_nsecs_to_secs - Accumulates nsecs into secs |
| 1325 | * |
| 1326 | * Helper function that accumulates a the nsecs greater then a second |
| 1327 | * from the xtime_nsec field to the xtime_secs field. |
| 1328 | * It also calls into the NTP code to handle leapsecond processing. |
| 1329 | * |
| 1330 | */ |
David Vrabel | 780427f | 2013-06-27 11:35:46 +0100 | [diff] [blame] | 1331 | static inline unsigned int accumulate_nsecs_to_secs(struct timekeeper *tk) |
John Stultz | 1f4f948 | 2012-07-13 01:21:54 -0400 | [diff] [blame] | 1332 | { |
| 1333 | u64 nsecps = (u64)NSEC_PER_SEC << tk->shift; |
John Stultz | 5258d3f | 2013-12-11 20:07:49 -0800 | [diff] [blame] | 1334 | unsigned int clock_set = 0; |
John Stultz | 1f4f948 | 2012-07-13 01:21:54 -0400 | [diff] [blame] | 1335 | |
| 1336 | while (tk->xtime_nsec >= nsecps) { |
| 1337 | int leap; |
| 1338 | |
| 1339 | tk->xtime_nsec -= nsecps; |
| 1340 | tk->xtime_sec++; |
| 1341 | |
| 1342 | /* Figure out if its a leap sec and apply if needed */ |
| 1343 | leap = second_overflow(tk->xtime_sec); |
John Stultz | 6d0ef90 | 2012-07-27 14:48:12 -0400 | [diff] [blame] | 1344 | if (unlikely(leap)) { |
John Stultz | 7d489d1 | 2014-07-16 21:04:01 +0000 | [diff] [blame] | 1345 | struct timespec64 ts; |
John Stultz | 1f4f948 | 2012-07-13 01:21:54 -0400 | [diff] [blame] | 1346 | |
John Stultz | 6d0ef90 | 2012-07-27 14:48:12 -0400 | [diff] [blame] | 1347 | tk->xtime_sec += leap; |
| 1348 | |
| 1349 | ts.tv_sec = leap; |
| 1350 | ts.tv_nsec = 0; |
| 1351 | tk_set_wall_to_mono(tk, |
John Stultz | 7d489d1 | 2014-07-16 21:04:01 +0000 | [diff] [blame] | 1352 | timespec64_sub(tk->wall_to_monotonic, ts)); |
John Stultz | 6d0ef90 | 2012-07-27 14:48:12 -0400 | [diff] [blame] | 1353 | |
John Stultz | cc244dd | 2012-05-03 12:30:07 -0700 | [diff] [blame] | 1354 | __timekeeping_set_tai_offset(tk, tk->tai_offset - leap); |
| 1355 | |
John Stultz | 5258d3f | 2013-12-11 20:07:49 -0800 | [diff] [blame] | 1356 | clock_set = TK_CLOCK_WAS_SET; |
John Stultz | 6d0ef90 | 2012-07-27 14:48:12 -0400 | [diff] [blame] | 1357 | } |
John Stultz | 1f4f948 | 2012-07-13 01:21:54 -0400 | [diff] [blame] | 1358 | } |
John Stultz | 5258d3f | 2013-12-11 20:07:49 -0800 | [diff] [blame] | 1359 | return clock_set; |
John Stultz | 1f4f948 | 2012-07-13 01:21:54 -0400 | [diff] [blame] | 1360 | } |
| 1361 | |
John Stultz | 1f4f948 | 2012-07-13 01:21:54 -0400 | [diff] [blame] | 1362 | /** |
john stultz | a092ff0 | 2009-10-02 16:17:53 -0700 | [diff] [blame] | 1363 | * logarithmic_accumulation - shifted accumulation of cycles |
| 1364 | * |
| 1365 | * This functions accumulates a shifted interval of cycles into |
| 1366 | * into a shifted interval nanoseconds. Allows for O(log) accumulation |
| 1367 | * loop. |
| 1368 | * |
| 1369 | * Returns the unconsumed cycles. |
| 1370 | */ |
John Stultz | f726a69 | 2012-07-13 01:21:57 -0400 | [diff] [blame] | 1371 | static cycle_t logarithmic_accumulation(struct timekeeper *tk, cycle_t offset, |
John Stultz | 5258d3f | 2013-12-11 20:07:49 -0800 | [diff] [blame] | 1372 | u32 shift, |
| 1373 | unsigned int *clock_set) |
john stultz | a092ff0 | 2009-10-02 16:17:53 -0700 | [diff] [blame] | 1374 | { |
Thomas Gleixner | 23a9537 | 2013-02-21 22:51:36 +0000 | [diff] [blame] | 1375 | cycle_t interval = tk->cycle_interval << shift; |
Jason Wessel | deda2e8 | 2010-08-09 14:20:09 -0700 | [diff] [blame] | 1376 | u64 raw_nsecs; |
john stultz | a092ff0 | 2009-10-02 16:17:53 -0700 | [diff] [blame] | 1377 | |
John Stultz | f726a69 | 2012-07-13 01:21:57 -0400 | [diff] [blame] | 1378 | /* If the offset is smaller then a shifted interval, do nothing */ |
Thomas Gleixner | 23a9537 | 2013-02-21 22:51:36 +0000 | [diff] [blame] | 1379 | if (offset < interval) |
john stultz | a092ff0 | 2009-10-02 16:17:53 -0700 | [diff] [blame] | 1380 | return offset; |
| 1381 | |
| 1382 | /* Accumulate one shifted interval */ |
Thomas Gleixner | 23a9537 | 2013-02-21 22:51:36 +0000 | [diff] [blame] | 1383 | offset -= interval; |
Thomas Gleixner | 7ec98e1 | 2013-02-21 22:51:39 +0000 | [diff] [blame] | 1384 | tk->cycle_last += interval; |
john stultz | a092ff0 | 2009-10-02 16:17:53 -0700 | [diff] [blame] | 1385 | |
John Stultz | f726a69 | 2012-07-13 01:21:57 -0400 | [diff] [blame] | 1386 | tk->xtime_nsec += tk->xtime_interval << shift; |
John Stultz | 5258d3f | 2013-12-11 20:07:49 -0800 | [diff] [blame] | 1387 | *clock_set |= accumulate_nsecs_to_secs(tk); |
john stultz | a092ff0 | 2009-10-02 16:17:53 -0700 | [diff] [blame] | 1388 | |
Jason Wessel | deda2e8 | 2010-08-09 14:20:09 -0700 | [diff] [blame] | 1389 | /* Accumulate raw time */ |
Dan Carpenter | 5b3900c | 2012-10-09 10:18:23 +0300 | [diff] [blame] | 1390 | raw_nsecs = (u64)tk->raw_interval << shift; |
John Stultz | f726a69 | 2012-07-13 01:21:57 -0400 | [diff] [blame] | 1391 | raw_nsecs += tk->raw_time.tv_nsec; |
John Stultz | c7dcf87 | 2010-08-13 11:30:58 -0700 | [diff] [blame] | 1392 | if (raw_nsecs >= NSEC_PER_SEC) { |
| 1393 | u64 raw_secs = raw_nsecs; |
| 1394 | raw_nsecs = do_div(raw_secs, NSEC_PER_SEC); |
John Stultz | f726a69 | 2012-07-13 01:21:57 -0400 | [diff] [blame] | 1395 | tk->raw_time.tv_sec += raw_secs; |
john stultz | a092ff0 | 2009-10-02 16:17:53 -0700 | [diff] [blame] | 1396 | } |
John Stultz | f726a69 | 2012-07-13 01:21:57 -0400 | [diff] [blame] | 1397 | tk->raw_time.tv_nsec = raw_nsecs; |
john stultz | a092ff0 | 2009-10-02 16:17:53 -0700 | [diff] [blame] | 1398 | |
| 1399 | /* Accumulate error between NTP and clock interval */ |
John Stultz | f726a69 | 2012-07-13 01:21:57 -0400 | [diff] [blame] | 1400 | tk->ntp_error += ntp_tick_length() << shift; |
| 1401 | tk->ntp_error -= (tk->xtime_interval + tk->xtime_remainder) << |
| 1402 | (tk->ntp_error_shift + shift); |
john stultz | a092ff0 | 2009-10-02 16:17:53 -0700 | [diff] [blame] | 1403 | |
| 1404 | return offset; |
| 1405 | } |
| 1406 | |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 1407 | /** |
| 1408 | * update_wall_time - Uses the current clocksource to increment the wall time |
| 1409 | * |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 1410 | */ |
John Stultz | 47a1b796 | 2013-12-12 13:10:55 -0800 | [diff] [blame] | 1411 | void update_wall_time(void) |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 1412 | { |
Martin Schwidefsky | 155ec60 | 2009-08-14 15:47:26 +0200 | [diff] [blame] | 1413 | struct clocksource *clock; |
Thomas Gleixner | 3fdb14f | 2014-07-16 21:04:07 +0000 | [diff] [blame] | 1414 | struct timekeeper *real_tk = &tk_core.timekeeper; |
Thomas Gleixner | 48cdc13 | 2013-02-21 22:51:40 +0000 | [diff] [blame] | 1415 | struct timekeeper *tk = &shadow_timekeeper; |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 1416 | cycle_t offset; |
john stultz | a092ff0 | 2009-10-02 16:17:53 -0700 | [diff] [blame] | 1417 | int shift = 0, maxshift; |
John Stultz | 5258d3f | 2013-12-11 20:07:49 -0800 | [diff] [blame] | 1418 | unsigned int clock_set = 0; |
John Stultz | 70471f2 | 2011-11-14 12:48:10 -0800 | [diff] [blame] | 1419 | unsigned long flags; |
| 1420 | |
Thomas Gleixner | 9a7a71b | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 1421 | raw_spin_lock_irqsave(&timekeeper_lock, flags); |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 1422 | |
| 1423 | /* Make sure we're fully resumed: */ |
| 1424 | if (unlikely(timekeeping_suspended)) |
John Stultz | 70471f2 | 2011-11-14 12:48:10 -0800 | [diff] [blame] | 1425 | goto out; |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 1426 | |
Thomas Gleixner | 48cdc13 | 2013-02-21 22:51:40 +0000 | [diff] [blame] | 1427 | clock = real_tk->clock; |
John Stultz | 592913e | 2010-07-13 17:56:20 -0700 | [diff] [blame] | 1428 | |
| 1429 | #ifdef CONFIG_ARCH_USES_GETTIMEOFFSET |
Thomas Gleixner | 48cdc13 | 2013-02-21 22:51:40 +0000 | [diff] [blame] | 1430 | offset = real_tk->cycle_interval; |
John Stultz | 592913e | 2010-07-13 17:56:20 -0700 | [diff] [blame] | 1431 | #else |
| 1432 | offset = (clock->read(clock) - clock->cycle_last) & clock->mask; |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 1433 | #endif |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 1434 | |
John Stultz | bf2ac31 | 2012-08-21 20:30:49 -0400 | [diff] [blame] | 1435 | /* Check if there's really nothing to do */ |
Thomas Gleixner | 48cdc13 | 2013-02-21 22:51:40 +0000 | [diff] [blame] | 1436 | if (offset < real_tk->cycle_interval) |
John Stultz | bf2ac31 | 2012-08-21 20:30:49 -0400 | [diff] [blame] | 1437 | goto out; |
| 1438 | |
john stultz | a092ff0 | 2009-10-02 16:17:53 -0700 | [diff] [blame] | 1439 | /* |
| 1440 | * With NO_HZ we may have to accumulate many cycle_intervals |
| 1441 | * (think "ticks") worth of time at once. To do this efficiently, |
| 1442 | * we calculate the largest doubling multiple of cycle_intervals |
Jim Cromie | 88b28ad | 2012-03-14 21:28:56 -0600 | [diff] [blame] | 1443 | * that is smaller than the offset. We then accumulate that |
john stultz | a092ff0 | 2009-10-02 16:17:53 -0700 | [diff] [blame] | 1444 | * chunk in one go, and then try to consume the next smaller |
| 1445 | * doubled multiple. |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 1446 | */ |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 1447 | shift = ilog2(offset) - ilog2(tk->cycle_interval); |
john stultz | a092ff0 | 2009-10-02 16:17:53 -0700 | [diff] [blame] | 1448 | shift = max(0, shift); |
Jim Cromie | 88b28ad | 2012-03-14 21:28:56 -0600 | [diff] [blame] | 1449 | /* Bound shift to one less than what overflows tick_length */ |
John Stultz | ea7cf49 | 2011-11-14 13:18:07 -0800 | [diff] [blame] | 1450 | maxshift = (64 - (ilog2(ntp_tick_length())+1)) - 1; |
john stultz | a092ff0 | 2009-10-02 16:17:53 -0700 | [diff] [blame] | 1451 | shift = min(shift, maxshift); |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 1452 | while (offset >= tk->cycle_interval) { |
John Stultz | 5258d3f | 2013-12-11 20:07:49 -0800 | [diff] [blame] | 1453 | offset = logarithmic_accumulation(tk, offset, shift, |
| 1454 | &clock_set); |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 1455 | if (offset < tk->cycle_interval<<shift) |
John Stultz | 830ec04 | 2010-03-18 14:47:30 -0700 | [diff] [blame] | 1456 | shift--; |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 1457 | } |
| 1458 | |
| 1459 | /* correct the clock when NTP error is too big */ |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 1460 | timekeeping_adjust(tk, offset); |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 1461 | |
John Stultz | 6a867a3 | 2010-04-06 14:30:51 -0700 | [diff] [blame] | 1462 | /* |
John Stultz | 92bb1fc | 2012-09-04 15:38:12 -0400 | [diff] [blame] | 1463 | * XXX This can be killed once everyone converts |
| 1464 | * to the new update_vsyscall. |
| 1465 | */ |
| 1466 | old_vsyscall_fixup(tk); |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 1467 | |
John Stultz | 6a867a3 | 2010-04-06 14:30:51 -0700 | [diff] [blame] | 1468 | /* |
| 1469 | * Finally, make sure that after the rounding |
John Stultz | 1e75fa8 | 2012-07-13 01:21:53 -0400 | [diff] [blame] | 1470 | * xtime_nsec isn't larger than NSEC_PER_SEC |
John Stultz | 6a867a3 | 2010-04-06 14:30:51 -0700 | [diff] [blame] | 1471 | */ |
John Stultz | 5258d3f | 2013-12-11 20:07:49 -0800 | [diff] [blame] | 1472 | clock_set |= accumulate_nsecs_to_secs(tk); |
Linus Torvalds | 83f57a1 | 2009-12-22 14:10:37 -0800 | [diff] [blame] | 1473 | |
Thomas Gleixner | 3fdb14f | 2014-07-16 21:04:07 +0000 | [diff] [blame] | 1474 | write_seqcount_begin(&tk_core.seq); |
Thomas Gleixner | 7ec98e1 | 2013-02-21 22:51:39 +0000 | [diff] [blame] | 1475 | /* Update clock->cycle_last with the new value */ |
| 1476 | clock->cycle_last = tk->cycle_last; |
Thomas Gleixner | 48cdc13 | 2013-02-21 22:51:40 +0000 | [diff] [blame] | 1477 | /* |
| 1478 | * Update the real timekeeper. |
| 1479 | * |
| 1480 | * We could avoid this memcpy by switching pointers, but that |
| 1481 | * requires changes to all other timekeeper usage sites as |
| 1482 | * well, i.e. move the timekeeper pointer getter into the |
| 1483 | * spinlocked/seqcount protected sections. And we trade this |
Thomas Gleixner | 3fdb14f | 2014-07-16 21:04:07 +0000 | [diff] [blame] | 1484 | * memcpy under the tk_core.seq against one before we start |
Thomas Gleixner | 48cdc13 | 2013-02-21 22:51:40 +0000 | [diff] [blame] | 1485 | * updating. |
| 1486 | */ |
| 1487 | memcpy(real_tk, tk, sizeof(*tk)); |
John Stultz | 5258d3f | 2013-12-11 20:07:49 -0800 | [diff] [blame] | 1488 | timekeeping_update(real_tk, clock_set); |
Thomas Gleixner | 3fdb14f | 2014-07-16 21:04:07 +0000 | [diff] [blame] | 1489 | write_seqcount_end(&tk_core.seq); |
Thomas Gleixner | ca4523c | 2013-02-21 22:51:40 +0000 | [diff] [blame] | 1490 | out: |
Thomas Gleixner | 9a7a71b | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 1491 | raw_spin_unlock_irqrestore(&timekeeper_lock, flags); |
John Stultz | 47a1b796 | 2013-12-12 13:10:55 -0800 | [diff] [blame] | 1492 | if (clock_set) |
John Stultz | cab5e12 | 2014-03-27 16:30:49 -0700 | [diff] [blame] | 1493 | /* Have to call _delayed version, since in irq context*/ |
| 1494 | clock_was_set_delayed(); |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 1495 | } |
Tomas Janousek | 7c3f1a5 | 2007-07-15 23:39:41 -0700 | [diff] [blame] | 1496 | |
| 1497 | /** |
| 1498 | * getboottime - Return the real time of system boot. |
| 1499 | * @ts: pointer to the timespec to be set |
| 1500 | * |
John Stultz | abb3a4e | 2011-02-14 17:52:09 -0800 | [diff] [blame] | 1501 | * Returns the wall-time of boot in a timespec. |
Tomas Janousek | 7c3f1a5 | 2007-07-15 23:39:41 -0700 | [diff] [blame] | 1502 | * |
| 1503 | * This is based on the wall_to_monotonic offset and the total suspend |
| 1504 | * time. Calls to settimeofday will affect the value returned (which |
| 1505 | * basically means that however wrong your real time clock is at boot time, |
| 1506 | * you get the right time here). |
| 1507 | */ |
| 1508 | void getboottime(struct timespec *ts) |
| 1509 | { |
Thomas Gleixner | 3fdb14f | 2014-07-16 21:04:07 +0000 | [diff] [blame] | 1510 | struct timekeeper *tk = &tk_core.timekeeper; |
Hiroshi Shimamoto | 36d4748 | 2009-08-25 15:08:30 +0900 | [diff] [blame] | 1511 | struct timespec boottime = { |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 1512 | .tv_sec = tk->wall_to_monotonic.tv_sec + |
| 1513 | tk->total_sleep_time.tv_sec, |
| 1514 | .tv_nsec = tk->wall_to_monotonic.tv_nsec + |
| 1515 | tk->total_sleep_time.tv_nsec |
Hiroshi Shimamoto | 36d4748 | 2009-08-25 15:08:30 +0900 | [diff] [blame] | 1516 | }; |
Martin Schwidefsky | d4f587c | 2009-08-14 15:47:31 +0200 | [diff] [blame] | 1517 | |
Martin Schwidefsky | d4f587c | 2009-08-14 15:47:31 +0200 | [diff] [blame] | 1518 | set_normalized_timespec(ts, -boottime.tv_sec, -boottime.tv_nsec); |
Tomas Janousek | 7c3f1a5 | 2007-07-15 23:39:41 -0700 | [diff] [blame] | 1519 | } |
Jason Wang | c93d89f | 2010-01-27 19:13:40 +0800 | [diff] [blame] | 1520 | EXPORT_SYMBOL_GPL(getboottime); |
Tomas Janousek | 7c3f1a5 | 2007-07-15 23:39:41 -0700 | [diff] [blame] | 1521 | |
John Stultz | abb3a4e | 2011-02-14 17:52:09 -0800 | [diff] [blame] | 1522 | /** |
| 1523 | * get_monotonic_boottime - Returns monotonic time since boot |
| 1524 | * @ts: pointer to the timespec to be set |
| 1525 | * |
| 1526 | * Returns the monotonic time since boot in a timespec. |
| 1527 | * |
| 1528 | * This is similar to CLOCK_MONTONIC/ktime_get_ts, but also |
| 1529 | * includes the time spent in suspend. |
| 1530 | */ |
| 1531 | void get_monotonic_boottime(struct timespec *ts) |
| 1532 | { |
Thomas Gleixner | 3fdb14f | 2014-07-16 21:04:07 +0000 | [diff] [blame] | 1533 | struct timekeeper *tk = &tk_core.timekeeper; |
John Stultz | 7d489d1 | 2014-07-16 21:04:01 +0000 | [diff] [blame] | 1534 | struct timespec64 tomono, sleep, ret; |
John Stultz | ec145ba | 2012-09-11 19:26:03 -0400 | [diff] [blame] | 1535 | s64 nsec; |
John Stultz | abb3a4e | 2011-02-14 17:52:09 -0800 | [diff] [blame] | 1536 | unsigned int seq; |
John Stultz | abb3a4e | 2011-02-14 17:52:09 -0800 | [diff] [blame] | 1537 | |
| 1538 | WARN_ON(timekeeping_suspended); |
| 1539 | |
| 1540 | do { |
Thomas Gleixner | 3fdb14f | 2014-07-16 21:04:07 +0000 | [diff] [blame] | 1541 | seq = read_seqcount_begin(&tk_core.seq); |
John Stultz | 7d489d1 | 2014-07-16 21:04:01 +0000 | [diff] [blame] | 1542 | ret.tv_sec = tk->xtime_sec; |
John Stultz | ec145ba | 2012-09-11 19:26:03 -0400 | [diff] [blame] | 1543 | nsec = timekeeping_get_ns(tk); |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 1544 | tomono = tk->wall_to_monotonic; |
| 1545 | sleep = tk->total_sleep_time; |
John Stultz | abb3a4e | 2011-02-14 17:52:09 -0800 | [diff] [blame] | 1546 | |
Thomas Gleixner | 3fdb14f | 2014-07-16 21:04:07 +0000 | [diff] [blame] | 1547 | } while (read_seqcount_retry(&tk_core.seq, seq)); |
John Stultz | abb3a4e | 2011-02-14 17:52:09 -0800 | [diff] [blame] | 1548 | |
John Stultz | 7d489d1 | 2014-07-16 21:04:01 +0000 | [diff] [blame] | 1549 | ret.tv_sec += tomono.tv_sec + sleep.tv_sec; |
| 1550 | ret.tv_nsec = 0; |
| 1551 | timespec64_add_ns(&ret, nsec + tomono.tv_nsec + sleep.tv_nsec); |
| 1552 | *ts = timespec64_to_timespec(ret); |
John Stultz | abb3a4e | 2011-02-14 17:52:09 -0800 | [diff] [blame] | 1553 | } |
| 1554 | EXPORT_SYMBOL_GPL(get_monotonic_boottime); |
| 1555 | |
| 1556 | /** |
| 1557 | * ktime_get_boottime - Returns monotonic time since boot in a ktime |
| 1558 | * |
| 1559 | * Returns the monotonic time since boot in a ktime |
| 1560 | * |
| 1561 | * This is similar to CLOCK_MONTONIC/ktime_get, but also |
| 1562 | * includes the time spent in suspend. |
| 1563 | */ |
| 1564 | ktime_t ktime_get_boottime(void) |
| 1565 | { |
| 1566 | struct timespec ts; |
| 1567 | |
| 1568 | get_monotonic_boottime(&ts); |
| 1569 | return timespec_to_ktime(ts); |
| 1570 | } |
| 1571 | EXPORT_SYMBOL_GPL(ktime_get_boottime); |
| 1572 | |
Tomas Janousek | 7c3f1a5 | 2007-07-15 23:39:41 -0700 | [diff] [blame] | 1573 | /** |
| 1574 | * monotonic_to_bootbased - Convert the monotonic time to boot based. |
| 1575 | * @ts: pointer to the timespec to be converted |
| 1576 | */ |
| 1577 | void monotonic_to_bootbased(struct timespec *ts) |
| 1578 | { |
Thomas Gleixner | 3fdb14f | 2014-07-16 21:04:07 +0000 | [diff] [blame] | 1579 | struct timekeeper *tk = &tk_core.timekeeper; |
John Stultz | 7d489d1 | 2014-07-16 21:04:01 +0000 | [diff] [blame] | 1580 | struct timespec64 ts64; |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 1581 | |
John Stultz | 7d489d1 | 2014-07-16 21:04:01 +0000 | [diff] [blame] | 1582 | ts64 = timespec_to_timespec64(*ts); |
| 1583 | ts64 = timespec64_add(ts64, tk->total_sleep_time); |
| 1584 | *ts = timespec64_to_timespec(ts64); |
Tomas Janousek | 7c3f1a5 | 2007-07-15 23:39:41 -0700 | [diff] [blame] | 1585 | } |
Jason Wang | c93d89f | 2010-01-27 19:13:40 +0800 | [diff] [blame] | 1586 | EXPORT_SYMBOL_GPL(monotonic_to_bootbased); |
john stultz | 2c6b47d | 2007-07-24 17:47:43 -0700 | [diff] [blame] | 1587 | |
john stultz | 17c38b7 | 2007-07-24 18:38:34 -0700 | [diff] [blame] | 1588 | unsigned long get_seconds(void) |
| 1589 | { |
Thomas Gleixner | 3fdb14f | 2014-07-16 21:04:07 +0000 | [diff] [blame] | 1590 | struct timekeeper *tk = &tk_core.timekeeper; |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 1591 | |
| 1592 | return tk->xtime_sec; |
john stultz | 17c38b7 | 2007-07-24 18:38:34 -0700 | [diff] [blame] | 1593 | } |
| 1594 | EXPORT_SYMBOL(get_seconds); |
| 1595 | |
john stultz | da15cfd | 2009-08-19 19:13:34 -0700 | [diff] [blame] | 1596 | struct timespec __current_kernel_time(void) |
| 1597 | { |
Thomas Gleixner | 3fdb14f | 2014-07-16 21:04:07 +0000 | [diff] [blame] | 1598 | struct timekeeper *tk = &tk_core.timekeeper; |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 1599 | |
John Stultz | 7d489d1 | 2014-07-16 21:04:01 +0000 | [diff] [blame] | 1600 | return timespec64_to_timespec(tk_xtime(tk)); |
john stultz | da15cfd | 2009-08-19 19:13:34 -0700 | [diff] [blame] | 1601 | } |
john stultz | 17c38b7 | 2007-07-24 18:38:34 -0700 | [diff] [blame] | 1602 | |
john stultz | 2c6b47d | 2007-07-24 17:47:43 -0700 | [diff] [blame] | 1603 | struct timespec current_kernel_time(void) |
| 1604 | { |
Thomas Gleixner | 3fdb14f | 2014-07-16 21:04:07 +0000 | [diff] [blame] | 1605 | struct timekeeper *tk = &tk_core.timekeeper; |
John Stultz | 7d489d1 | 2014-07-16 21:04:01 +0000 | [diff] [blame] | 1606 | struct timespec64 now; |
john stultz | 2c6b47d | 2007-07-24 17:47:43 -0700 | [diff] [blame] | 1607 | unsigned long seq; |
| 1608 | |
| 1609 | do { |
Thomas Gleixner | 3fdb14f | 2014-07-16 21:04:07 +0000 | [diff] [blame] | 1610 | seq = read_seqcount_begin(&tk_core.seq); |
Linus Torvalds | 83f57a1 | 2009-12-22 14:10:37 -0800 | [diff] [blame] | 1611 | |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 1612 | now = tk_xtime(tk); |
Thomas Gleixner | 3fdb14f | 2014-07-16 21:04:07 +0000 | [diff] [blame] | 1613 | } while (read_seqcount_retry(&tk_core.seq, seq)); |
john stultz | 2c6b47d | 2007-07-24 17:47:43 -0700 | [diff] [blame] | 1614 | |
John Stultz | 7d489d1 | 2014-07-16 21:04:01 +0000 | [diff] [blame] | 1615 | return timespec64_to_timespec(now); |
john stultz | 2c6b47d | 2007-07-24 17:47:43 -0700 | [diff] [blame] | 1616 | } |
john stultz | 2c6b47d | 2007-07-24 17:47:43 -0700 | [diff] [blame] | 1617 | EXPORT_SYMBOL(current_kernel_time); |
john stultz | da15cfd | 2009-08-19 19:13:34 -0700 | [diff] [blame] | 1618 | |
| 1619 | struct timespec get_monotonic_coarse(void) |
| 1620 | { |
Thomas Gleixner | 3fdb14f | 2014-07-16 21:04:07 +0000 | [diff] [blame] | 1621 | struct timekeeper *tk = &tk_core.timekeeper; |
John Stultz | 7d489d1 | 2014-07-16 21:04:01 +0000 | [diff] [blame] | 1622 | struct timespec64 now, mono; |
john stultz | da15cfd | 2009-08-19 19:13:34 -0700 | [diff] [blame] | 1623 | unsigned long seq; |
| 1624 | |
| 1625 | do { |
Thomas Gleixner | 3fdb14f | 2014-07-16 21:04:07 +0000 | [diff] [blame] | 1626 | seq = read_seqcount_begin(&tk_core.seq); |
Linus Torvalds | 83f57a1 | 2009-12-22 14:10:37 -0800 | [diff] [blame] | 1627 | |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 1628 | now = tk_xtime(tk); |
| 1629 | mono = tk->wall_to_monotonic; |
Thomas Gleixner | 3fdb14f | 2014-07-16 21:04:07 +0000 | [diff] [blame] | 1630 | } while (read_seqcount_retry(&tk_core.seq, seq)); |
john stultz | da15cfd | 2009-08-19 19:13:34 -0700 | [diff] [blame] | 1631 | |
John Stultz | 7d489d1 | 2014-07-16 21:04:01 +0000 | [diff] [blame] | 1632 | set_normalized_timespec64(&now, now.tv_sec + mono.tv_sec, |
john stultz | da15cfd | 2009-08-19 19:13:34 -0700 | [diff] [blame] | 1633 | now.tv_nsec + mono.tv_nsec); |
John Stultz | 7d489d1 | 2014-07-16 21:04:01 +0000 | [diff] [blame] | 1634 | |
| 1635 | return timespec64_to_timespec(now); |
john stultz | da15cfd | 2009-08-19 19:13:34 -0700 | [diff] [blame] | 1636 | } |
Torben Hohn | 871cf1e | 2011-01-27 15:58:55 +0100 | [diff] [blame] | 1637 | |
| 1638 | /* |
John Stultz | d6ad418 | 2012-02-28 16:50:11 -0800 | [diff] [blame] | 1639 | * Must hold jiffies_lock |
Torben Hohn | 871cf1e | 2011-01-27 15:58:55 +0100 | [diff] [blame] | 1640 | */ |
| 1641 | void do_timer(unsigned long ticks) |
| 1642 | { |
| 1643 | jiffies_64 += ticks; |
Torben Hohn | 871cf1e | 2011-01-27 15:58:55 +0100 | [diff] [blame] | 1644 | calc_global_load(ticks); |
| 1645 | } |
Torben Hohn | 48cf76f7 | 2011-01-27 15:59:05 +0100 | [diff] [blame] | 1646 | |
| 1647 | /** |
John Stultz | 76f4108 | 2014-07-16 21:03:52 +0000 | [diff] [blame] | 1648 | * ktime_get_update_offsets_tick - hrtimer helper |
| 1649 | * @offs_real: pointer to storage for monotonic -> realtime offset |
| 1650 | * @offs_boot: pointer to storage for monotonic -> boottime offset |
| 1651 | * @offs_tai: pointer to storage for monotonic -> clock tai offset |
| 1652 | * |
| 1653 | * Returns monotonic time at last tick and various offsets |
Torben Hohn | 48cf76f7 | 2011-01-27 15:59:05 +0100 | [diff] [blame] | 1654 | */ |
John Stultz | 76f4108 | 2014-07-16 21:03:52 +0000 | [diff] [blame] | 1655 | ktime_t ktime_get_update_offsets_tick(ktime_t *offs_real, ktime_t *offs_boot, |
| 1656 | ktime_t *offs_tai) |
Torben Hohn | 48cf76f7 | 2011-01-27 15:59:05 +0100 | [diff] [blame] | 1657 | { |
Thomas Gleixner | 3fdb14f | 2014-07-16 21:04:07 +0000 | [diff] [blame] | 1658 | struct timekeeper *tk = &tk_core.timekeeper; |
John Stultz | 7d489d1 | 2014-07-16 21:04:01 +0000 | [diff] [blame] | 1659 | struct timespec64 ts; |
John Stultz | 76f4108 | 2014-07-16 21:03:52 +0000 | [diff] [blame] | 1660 | ktime_t now; |
| 1661 | unsigned int seq; |
Torben Hohn | 48cf76f7 | 2011-01-27 15:59:05 +0100 | [diff] [blame] | 1662 | |
| 1663 | do { |
Thomas Gleixner | 3fdb14f | 2014-07-16 21:04:07 +0000 | [diff] [blame] | 1664 | seq = read_seqcount_begin(&tk_core.seq); |
John Stultz | 76f4108 | 2014-07-16 21:03:52 +0000 | [diff] [blame] | 1665 | |
| 1666 | ts = tk_xtime(tk); |
John Stultz | 76f4108 | 2014-07-16 21:03:52 +0000 | [diff] [blame] | 1667 | *offs_real = tk->offs_real; |
| 1668 | *offs_boot = tk->offs_boot; |
| 1669 | *offs_tai = tk->offs_tai; |
Thomas Gleixner | 3fdb14f | 2014-07-16 21:04:07 +0000 | [diff] [blame] | 1670 | } while (read_seqcount_retry(&tk_core.seq, seq)); |
John Stultz | 76f4108 | 2014-07-16 21:03:52 +0000 | [diff] [blame] | 1671 | |
| 1672 | now = ktime_set(ts.tv_sec, ts.tv_nsec); |
| 1673 | now = ktime_sub(now, *offs_real); |
| 1674 | return now; |
Torben Hohn | 48cf76f7 | 2011-01-27 15:59:05 +0100 | [diff] [blame] | 1675 | } |
Torben Hohn | f0af911a9 | 2011-01-27 15:59:10 +0100 | [diff] [blame] | 1676 | |
Thomas Gleixner | f6c06ab | 2012-07-10 18:43:24 -0400 | [diff] [blame] | 1677 | #ifdef CONFIG_HIGH_RES_TIMERS |
| 1678 | /** |
John Stultz | 76f4108 | 2014-07-16 21:03:52 +0000 | [diff] [blame] | 1679 | * ktime_get_update_offsets_now - hrtimer helper |
Thomas Gleixner | f6c06ab | 2012-07-10 18:43:24 -0400 | [diff] [blame] | 1680 | * @offs_real: pointer to storage for monotonic -> realtime offset |
| 1681 | * @offs_boot: pointer to storage for monotonic -> boottime offset |
Xie XiuQi | b7bc50e | 2013-10-18 09:13:30 +0800 | [diff] [blame] | 1682 | * @offs_tai: pointer to storage for monotonic -> clock tai offset |
Thomas Gleixner | f6c06ab | 2012-07-10 18:43:24 -0400 | [diff] [blame] | 1683 | * |
| 1684 | * Returns current monotonic time and updates the offsets |
Xie XiuQi | b7bc50e | 2013-10-18 09:13:30 +0800 | [diff] [blame] | 1685 | * Called from hrtimer_interrupt() or retrigger_next_event() |
Thomas Gleixner | f6c06ab | 2012-07-10 18:43:24 -0400 | [diff] [blame] | 1686 | */ |
John Stultz | 76f4108 | 2014-07-16 21:03:52 +0000 | [diff] [blame] | 1687 | ktime_t ktime_get_update_offsets_now(ktime_t *offs_real, ktime_t *offs_boot, |
John Stultz | 90adda9 | 2013-01-21 17:00:11 -0800 | [diff] [blame] | 1688 | ktime_t *offs_tai) |
Thomas Gleixner | f6c06ab | 2012-07-10 18:43:24 -0400 | [diff] [blame] | 1689 | { |
Thomas Gleixner | 3fdb14f | 2014-07-16 21:04:07 +0000 | [diff] [blame] | 1690 | struct timekeeper *tk = &tk_core.timekeeper; |
Thomas Gleixner | f6c06ab | 2012-07-10 18:43:24 -0400 | [diff] [blame] | 1691 | ktime_t now; |
| 1692 | unsigned int seq; |
| 1693 | u64 secs, nsecs; |
| 1694 | |
| 1695 | do { |
Thomas Gleixner | 3fdb14f | 2014-07-16 21:04:07 +0000 | [diff] [blame] | 1696 | seq = read_seqcount_begin(&tk_core.seq); |
Thomas Gleixner | f6c06ab | 2012-07-10 18:43:24 -0400 | [diff] [blame] | 1697 | |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 1698 | secs = tk->xtime_sec; |
| 1699 | nsecs = timekeeping_get_ns(tk); |
Thomas Gleixner | f6c06ab | 2012-07-10 18:43:24 -0400 | [diff] [blame] | 1700 | |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 1701 | *offs_real = tk->offs_real; |
| 1702 | *offs_boot = tk->offs_boot; |
John Stultz | 90adda9 | 2013-01-21 17:00:11 -0800 | [diff] [blame] | 1703 | *offs_tai = tk->offs_tai; |
Thomas Gleixner | 3fdb14f | 2014-07-16 21:04:07 +0000 | [diff] [blame] | 1704 | } while (read_seqcount_retry(&tk_core.seq, seq)); |
Thomas Gleixner | f6c06ab | 2012-07-10 18:43:24 -0400 | [diff] [blame] | 1705 | |
| 1706 | now = ktime_add_ns(ktime_set(secs, 0), nsecs); |
| 1707 | now = ktime_sub(now, *offs_real); |
| 1708 | return now; |
| 1709 | } |
| 1710 | #endif |
| 1711 | |
Torben Hohn | f0af911a9 | 2011-01-27 15:59:10 +0100 | [diff] [blame] | 1712 | /** |
Thomas Gleixner | 99ee531 | 2011-04-27 14:16:42 +0200 | [diff] [blame] | 1713 | * ktime_get_monotonic_offset() - get wall_to_monotonic in ktime_t format |
| 1714 | */ |
| 1715 | ktime_t ktime_get_monotonic_offset(void) |
| 1716 | { |
Thomas Gleixner | 3fdb14f | 2014-07-16 21:04:07 +0000 | [diff] [blame] | 1717 | struct timekeeper *tk = &tk_core.timekeeper; |
Thomas Gleixner | 99ee531 | 2011-04-27 14:16:42 +0200 | [diff] [blame] | 1718 | unsigned long seq; |
John Stultz | 7d489d1 | 2014-07-16 21:04:01 +0000 | [diff] [blame] | 1719 | struct timespec64 wtom; |
Thomas Gleixner | 99ee531 | 2011-04-27 14:16:42 +0200 | [diff] [blame] | 1720 | |
| 1721 | do { |
Thomas Gleixner | 3fdb14f | 2014-07-16 21:04:07 +0000 | [diff] [blame] | 1722 | seq = read_seqcount_begin(&tk_core.seq); |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 1723 | wtom = tk->wall_to_monotonic; |
Thomas Gleixner | 3fdb14f | 2014-07-16 21:04:07 +0000 | [diff] [blame] | 1724 | } while (read_seqcount_retry(&tk_core.seq, seq)); |
John Stultz | 70471f2 | 2011-11-14 12:48:10 -0800 | [diff] [blame] | 1725 | |
John Stultz | 7d489d1 | 2014-07-16 21:04:01 +0000 | [diff] [blame] | 1726 | return timespec64_to_ktime(wtom); |
Thomas Gleixner | 99ee531 | 2011-04-27 14:16:42 +0200 | [diff] [blame] | 1727 | } |
John Stultz | a80b83b | 2012-02-03 00:19:07 -0800 | [diff] [blame] | 1728 | EXPORT_SYMBOL_GPL(ktime_get_monotonic_offset); |
| 1729 | |
Thomas Gleixner | 99ee531 | 2011-04-27 14:16:42 +0200 | [diff] [blame] | 1730 | /** |
John Stultz | aa6f9c59 | 2013-03-22 11:31:29 -0700 | [diff] [blame] | 1731 | * do_adjtimex() - Accessor function to NTP __do_adjtimex function |
| 1732 | */ |
| 1733 | int do_adjtimex(struct timex *txc) |
| 1734 | { |
Thomas Gleixner | 3fdb14f | 2014-07-16 21:04:07 +0000 | [diff] [blame] | 1735 | struct timekeeper *tk = &tk_core.timekeeper; |
John Stultz | 06c017f | 2013-03-22 11:37:28 -0700 | [diff] [blame] | 1736 | unsigned long flags; |
John Stultz | 7d489d1 | 2014-07-16 21:04:01 +0000 | [diff] [blame] | 1737 | struct timespec64 ts; |
John Stultz | 4e8f8b3 | 2013-04-10 12:41:49 -0700 | [diff] [blame] | 1738 | s32 orig_tai, tai; |
John Stultz | e408569 | 2013-03-22 12:08:52 -0700 | [diff] [blame] | 1739 | int ret; |
| 1740 | |
| 1741 | /* Validate the data before disabling interrupts */ |
| 1742 | ret = ntp_validate_timex(txc); |
| 1743 | if (ret) |
| 1744 | return ret; |
| 1745 | |
John Stultz | cef9037 | 2013-03-22 15:04:13 -0700 | [diff] [blame] | 1746 | if (txc->modes & ADJ_SETOFFSET) { |
| 1747 | struct timespec delta; |
| 1748 | delta.tv_sec = txc->time.tv_sec; |
| 1749 | delta.tv_nsec = txc->time.tv_usec; |
| 1750 | if (!(txc->modes & ADJ_NANO)) |
| 1751 | delta.tv_nsec *= 1000; |
| 1752 | ret = timekeeping_inject_offset(&delta); |
| 1753 | if (ret) |
| 1754 | return ret; |
| 1755 | } |
| 1756 | |
Thomas Gleixner | d6d2989 | 2014-07-16 21:04:04 +0000 | [diff] [blame] | 1757 | getnstimeofday64(&ts); |
John Stultz | aa6f9c59 | 2013-03-22 11:31:29 -0700 | [diff] [blame] | 1758 | |
John Stultz | 06c017f | 2013-03-22 11:37:28 -0700 | [diff] [blame] | 1759 | raw_spin_lock_irqsave(&timekeeper_lock, flags); |
Thomas Gleixner | 3fdb14f | 2014-07-16 21:04:07 +0000 | [diff] [blame] | 1760 | write_seqcount_begin(&tk_core.seq); |
John Stultz | 06c017f | 2013-03-22 11:37:28 -0700 | [diff] [blame] | 1761 | |
John Stultz | 4e8f8b3 | 2013-04-10 12:41:49 -0700 | [diff] [blame] | 1762 | orig_tai = tai = tk->tai_offset; |
John Stultz | 87ace39 | 2013-03-22 12:28:15 -0700 | [diff] [blame] | 1763 | ret = __do_adjtimex(txc, &ts, &tai); |
| 1764 | |
John Stultz | 4e8f8b3 | 2013-04-10 12:41:49 -0700 | [diff] [blame] | 1765 | if (tai != orig_tai) { |
| 1766 | __timekeeping_set_tai_offset(tk, tai); |
John Stultz | f55c076 | 2013-12-11 18:50:25 -0800 | [diff] [blame] | 1767 | timekeeping_update(tk, TK_MIRROR | TK_CLOCK_WAS_SET); |
John Stultz | 4e8f8b3 | 2013-04-10 12:41:49 -0700 | [diff] [blame] | 1768 | } |
Thomas Gleixner | 3fdb14f | 2014-07-16 21:04:07 +0000 | [diff] [blame] | 1769 | write_seqcount_end(&tk_core.seq); |
John Stultz | 06c017f | 2013-03-22 11:37:28 -0700 | [diff] [blame] | 1770 | raw_spin_unlock_irqrestore(&timekeeper_lock, flags); |
| 1771 | |
John Stultz | 6fdda9a | 2013-12-10 17:18:18 -0800 | [diff] [blame] | 1772 | if (tai != orig_tai) |
| 1773 | clock_was_set(); |
| 1774 | |
John Stultz | 7bd3601 | 2013-09-11 16:50:56 -0700 | [diff] [blame] | 1775 | ntp_notify_cmos_timer(); |
| 1776 | |
John Stultz | 87ace39 | 2013-03-22 12:28:15 -0700 | [diff] [blame] | 1777 | return ret; |
| 1778 | } |
John Stultz | aa6f9c59 | 2013-03-22 11:31:29 -0700 | [diff] [blame] | 1779 | |
| 1780 | #ifdef CONFIG_NTP_PPS |
| 1781 | /** |
| 1782 | * hardpps() - Accessor function to NTP __hardpps function |
| 1783 | */ |
| 1784 | void hardpps(const struct timespec *phase_ts, const struct timespec *raw_ts) |
| 1785 | { |
John Stultz | 06c017f | 2013-03-22 11:37:28 -0700 | [diff] [blame] | 1786 | unsigned long flags; |
| 1787 | |
| 1788 | raw_spin_lock_irqsave(&timekeeper_lock, flags); |
Thomas Gleixner | 3fdb14f | 2014-07-16 21:04:07 +0000 | [diff] [blame] | 1789 | write_seqcount_begin(&tk_core.seq); |
John Stultz | 06c017f | 2013-03-22 11:37:28 -0700 | [diff] [blame] | 1790 | |
John Stultz | aa6f9c59 | 2013-03-22 11:31:29 -0700 | [diff] [blame] | 1791 | __hardpps(phase_ts, raw_ts); |
John Stultz | 06c017f | 2013-03-22 11:37:28 -0700 | [diff] [blame] | 1792 | |
Thomas Gleixner | 3fdb14f | 2014-07-16 21:04:07 +0000 | [diff] [blame] | 1793 | write_seqcount_end(&tk_core.seq); |
John Stultz | 06c017f | 2013-03-22 11:37:28 -0700 | [diff] [blame] | 1794 | raw_spin_unlock_irqrestore(&timekeeper_lock, flags); |
John Stultz | aa6f9c59 | 2013-03-22 11:31:29 -0700 | [diff] [blame] | 1795 | } |
| 1796 | EXPORT_SYMBOL(hardpps); |
| 1797 | #endif |
| 1798 | |
| 1799 | /** |
Torben Hohn | f0af911a9 | 2011-01-27 15:59:10 +0100 | [diff] [blame] | 1800 | * xtime_update() - advances the timekeeping infrastructure |
| 1801 | * @ticks: number of ticks, that have elapsed since the last call. |
| 1802 | * |
| 1803 | * Must be called with interrupts disabled. |
| 1804 | */ |
| 1805 | void xtime_update(unsigned long ticks) |
| 1806 | { |
John Stultz | d6ad418 | 2012-02-28 16:50:11 -0800 | [diff] [blame] | 1807 | write_seqlock(&jiffies_lock); |
Torben Hohn | f0af911a9 | 2011-01-27 15:59:10 +0100 | [diff] [blame] | 1808 | do_timer(ticks); |
John Stultz | d6ad418 | 2012-02-28 16:50:11 -0800 | [diff] [blame] | 1809 | write_sequnlock(&jiffies_lock); |
John Stultz | 47a1b796 | 2013-12-12 13:10:55 -0800 | [diff] [blame] | 1810 | update_wall_time(); |
Torben Hohn | f0af911a9 | 2011-01-27 15:59:10 +0100 | [diff] [blame] | 1811 | } |