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 | |
H Hartley Sweeten | afa14e7 | 2011-01-11 17:59:38 -0600 | [diff] [blame] | 35 | static struct timekeeper timekeeper; |
Thomas Gleixner | 9a7a71b | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 36 | static DEFINE_RAW_SPINLOCK(timekeeper_lock); |
| 37 | static seqcount_t timekeeper_seq; |
Thomas Gleixner | 48cdc13 | 2013-02-21 22:51:40 +0000 | [diff] [blame] | 38 | static struct timekeeper shadow_timekeeper; |
Martin Schwidefsky | 155ec60 | 2009-08-14 15:47:26 +0200 | [diff] [blame] | 39 | |
John Stultz | 8fcce54 | 2011-11-14 11:46:39 -0800 | [diff] [blame] | 40 | /* flag for if timekeeping is suspended */ |
| 41 | int __read_mostly timekeeping_suspended; |
| 42 | |
Feng Tang | 31ade30 | 2013-01-16 00:09:47 +0800 | [diff] [blame] | 43 | /* Flag for if there is a persistent clock on this platform */ |
| 44 | bool __read_mostly persistent_clock_exist = false; |
| 45 | |
John Stultz | 1e75fa8 | 2012-07-13 01:21:53 -0400 | [diff] [blame] | 46 | static inline void tk_normalize_xtime(struct timekeeper *tk) |
| 47 | { |
| 48 | while (tk->xtime_nsec >= ((u64)NSEC_PER_SEC << tk->shift)) { |
| 49 | tk->xtime_nsec -= (u64)NSEC_PER_SEC << tk->shift; |
| 50 | tk->xtime_sec++; |
| 51 | } |
| 52 | } |
John Stultz | 8fcce54 | 2011-11-14 11:46:39 -0800 | [diff] [blame] | 53 | |
Thomas Gleixner | c905fae | 2014-07-16 21:04:05 +0000 | [diff] [blame^] | 54 | static inline struct timespec64 tk_xtime(struct timekeeper *tk) |
| 55 | { |
| 56 | struct timespec64 ts; |
| 57 | |
| 58 | ts.tv_sec = tk->xtime_sec; |
| 59 | ts.tv_nsec = (long)(tk->xtime_nsec >> tk->shift); |
| 60 | return ts; |
| 61 | } |
| 62 | |
John Stultz | 7d489d1 | 2014-07-16 21:04:01 +0000 | [diff] [blame] | 63 | static void tk_set_xtime(struct timekeeper *tk, const struct timespec64 *ts) |
John Stultz | 1e75fa8 | 2012-07-13 01:21:53 -0400 | [diff] [blame] | 64 | { |
| 65 | tk->xtime_sec = ts->tv_sec; |
John Stultz | b44d50d | 2012-07-23 16:22:37 -0400 | [diff] [blame] | 66 | tk->xtime_nsec = (u64)ts->tv_nsec << tk->shift; |
John Stultz | 1e75fa8 | 2012-07-13 01:21:53 -0400 | [diff] [blame] | 67 | } |
| 68 | |
John Stultz | 7d489d1 | 2014-07-16 21:04:01 +0000 | [diff] [blame] | 69 | static void tk_xtime_add(struct timekeeper *tk, const struct timespec64 *ts) |
John Stultz | 1e75fa8 | 2012-07-13 01:21:53 -0400 | [diff] [blame] | 70 | { |
| 71 | tk->xtime_sec += ts->tv_sec; |
John Stultz | b44d50d | 2012-07-23 16:22:37 -0400 | [diff] [blame] | 72 | tk->xtime_nsec += (u64)ts->tv_nsec << tk->shift; |
John Stultz | 784ffcb | 2012-08-21 20:30:46 -0400 | [diff] [blame] | 73 | tk_normalize_xtime(tk); |
John Stultz | 1e75fa8 | 2012-07-13 01:21:53 -0400 | [diff] [blame] | 74 | } |
John Stultz | 8fcce54 | 2011-11-14 11:46:39 -0800 | [diff] [blame] | 75 | |
John Stultz | 7d489d1 | 2014-07-16 21:04:01 +0000 | [diff] [blame] | 76 | 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] | 77 | { |
John Stultz | 7d489d1 | 2014-07-16 21:04:01 +0000 | [diff] [blame] | 78 | struct timespec64 tmp; |
John Stultz | 6d0ef90 | 2012-07-27 14:48:12 -0400 | [diff] [blame] | 79 | |
| 80 | /* |
| 81 | * Verify consistency of: offset_real = -wall_to_monotonic |
| 82 | * before modifying anything |
| 83 | */ |
John Stultz | 7d489d1 | 2014-07-16 21:04:01 +0000 | [diff] [blame] | 84 | set_normalized_timespec64(&tmp, -tk->wall_to_monotonic.tv_sec, |
John Stultz | 6d0ef90 | 2012-07-27 14:48:12 -0400 | [diff] [blame] | 85 | -tk->wall_to_monotonic.tv_nsec); |
John Stultz | 7d489d1 | 2014-07-16 21:04:01 +0000 | [diff] [blame] | 86 | WARN_ON_ONCE(tk->offs_real.tv64 != timespec64_to_ktime(tmp).tv64); |
John Stultz | 6d0ef90 | 2012-07-27 14:48:12 -0400 | [diff] [blame] | 87 | tk->wall_to_monotonic = wtm; |
John Stultz | 7d489d1 | 2014-07-16 21:04:01 +0000 | [diff] [blame] | 88 | set_normalized_timespec64(&tmp, -wtm.tv_sec, -wtm.tv_nsec); |
| 89 | tk->offs_real = timespec64_to_ktime(tmp); |
John Stultz | 04005f6 | 2013-12-10 17:13:35 -0800 | [diff] [blame] | 90 | 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] | 91 | } |
| 92 | |
John Stultz | 7d489d1 | 2014-07-16 21:04:01 +0000 | [diff] [blame] | 93 | static void tk_set_sleep_time(struct timekeeper *tk, struct timespec64 t) |
John Stultz | 6d0ef90 | 2012-07-27 14:48:12 -0400 | [diff] [blame] | 94 | { |
| 95 | /* Verify consistency before modifying */ |
John Stultz | 7d489d1 | 2014-07-16 21:04:01 +0000 | [diff] [blame] | 96 | 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] | 97 | |
| 98 | tk->total_sleep_time = t; |
John Stultz | 7d489d1 | 2014-07-16 21:04:01 +0000 | [diff] [blame] | 99 | tk->offs_boot = timespec64_to_ktime(t); |
John Stultz | 6d0ef90 | 2012-07-27 14:48:12 -0400 | [diff] [blame] | 100 | } |
| 101 | |
Martin Schwidefsky | 155ec60 | 2009-08-14 15:47:26 +0200 | [diff] [blame] | 102 | /** |
Yijing Wang | d26e4fe | 2013-11-28 16:28:55 +0800 | [diff] [blame] | 103 | * tk_setup_internals - Set up internals to use clocksource clock. |
Martin Schwidefsky | 155ec60 | 2009-08-14 15:47:26 +0200 | [diff] [blame] | 104 | * |
Yijing Wang | d26e4fe | 2013-11-28 16:28:55 +0800 | [diff] [blame] | 105 | * @tk: The target timekeeper to setup. |
Martin Schwidefsky | 155ec60 | 2009-08-14 15:47:26 +0200 | [diff] [blame] | 106 | * @clock: Pointer to clocksource. |
| 107 | * |
| 108 | * Calculates a fixed cycle/nsec interval for a given clocksource/adjustment |
| 109 | * pair and interval request. |
| 110 | * |
| 111 | * Unless you're the timekeeping code, you should not be using this! |
| 112 | */ |
John Stultz | f726a69 | 2012-07-13 01:21:57 -0400 | [diff] [blame] | 113 | static void tk_setup_internals(struct timekeeper *tk, struct clocksource *clock) |
Martin Schwidefsky | 155ec60 | 2009-08-14 15:47:26 +0200 | [diff] [blame] | 114 | { |
| 115 | cycle_t interval; |
Kasper Pedersen | a386b5a | 2010-10-20 15:55:15 -0700 | [diff] [blame] | 116 | u64 tmp, ntpinterval; |
John Stultz | 1e75fa8 | 2012-07-13 01:21:53 -0400 | [diff] [blame] | 117 | struct clocksource *old_clock; |
Martin Schwidefsky | 155ec60 | 2009-08-14 15:47:26 +0200 | [diff] [blame] | 118 | |
John Stultz | f726a69 | 2012-07-13 01:21:57 -0400 | [diff] [blame] | 119 | old_clock = tk->clock; |
| 120 | tk->clock = clock; |
Thomas Gleixner | 14a3b6a | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 121 | tk->cycle_last = clock->cycle_last = clock->read(clock); |
Martin Schwidefsky | 155ec60 | 2009-08-14 15:47:26 +0200 | [diff] [blame] | 122 | |
| 123 | /* Do the ns -> cycle conversion first, using original mult */ |
| 124 | tmp = NTP_INTERVAL_LENGTH; |
| 125 | tmp <<= clock->shift; |
Kasper Pedersen | a386b5a | 2010-10-20 15:55:15 -0700 | [diff] [blame] | 126 | ntpinterval = tmp; |
Martin Schwidefsky | 0a54419 | 2009-08-14 15:47:28 +0200 | [diff] [blame] | 127 | tmp += clock->mult/2; |
| 128 | do_div(tmp, clock->mult); |
Martin Schwidefsky | 155ec60 | 2009-08-14 15:47:26 +0200 | [diff] [blame] | 129 | if (tmp == 0) |
| 130 | tmp = 1; |
| 131 | |
| 132 | interval = (cycle_t) tmp; |
John Stultz | f726a69 | 2012-07-13 01:21:57 -0400 | [diff] [blame] | 133 | tk->cycle_interval = interval; |
Martin Schwidefsky | 155ec60 | 2009-08-14 15:47:26 +0200 | [diff] [blame] | 134 | |
| 135 | /* Go back from cycles -> shifted ns */ |
John Stultz | f726a69 | 2012-07-13 01:21:57 -0400 | [diff] [blame] | 136 | tk->xtime_interval = (u64) interval * clock->mult; |
| 137 | tk->xtime_remainder = ntpinterval - tk->xtime_interval; |
| 138 | tk->raw_interval = |
Martin Schwidefsky | 0a54419 | 2009-08-14 15:47:28 +0200 | [diff] [blame] | 139 | ((u64) interval * clock->mult) >> clock->shift; |
Martin Schwidefsky | 155ec60 | 2009-08-14 15:47:26 +0200 | [diff] [blame] | 140 | |
John Stultz | 1e75fa8 | 2012-07-13 01:21:53 -0400 | [diff] [blame] | 141 | /* if changing clocks, convert xtime_nsec shift units */ |
| 142 | if (old_clock) { |
| 143 | int shift_change = clock->shift - old_clock->shift; |
| 144 | if (shift_change < 0) |
John Stultz | f726a69 | 2012-07-13 01:21:57 -0400 | [diff] [blame] | 145 | tk->xtime_nsec >>= -shift_change; |
John Stultz | 1e75fa8 | 2012-07-13 01:21:53 -0400 | [diff] [blame] | 146 | else |
John Stultz | f726a69 | 2012-07-13 01:21:57 -0400 | [diff] [blame] | 147 | tk->xtime_nsec <<= shift_change; |
John Stultz | 1e75fa8 | 2012-07-13 01:21:53 -0400 | [diff] [blame] | 148 | } |
John Stultz | f726a69 | 2012-07-13 01:21:57 -0400 | [diff] [blame] | 149 | tk->shift = clock->shift; |
Martin Schwidefsky | 155ec60 | 2009-08-14 15:47:26 +0200 | [diff] [blame] | 150 | |
John Stultz | f726a69 | 2012-07-13 01:21:57 -0400 | [diff] [blame] | 151 | tk->ntp_error = 0; |
| 152 | tk->ntp_error_shift = NTP_SCALE_SHIFT - clock->shift; |
Martin Schwidefsky | 0a54419 | 2009-08-14 15:47:28 +0200 | [diff] [blame] | 153 | |
| 154 | /* |
| 155 | * The timekeeper keeps its own mult values for the currently |
| 156 | * active clocksource. These value will be adjusted via NTP |
| 157 | * to counteract clock drifting. |
| 158 | */ |
John Stultz | f726a69 | 2012-07-13 01:21:57 -0400 | [diff] [blame] | 159 | tk->mult = clock->mult; |
Martin Schwidefsky | 155ec60 | 2009-08-14 15:47:26 +0200 | [diff] [blame] | 160 | } |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 161 | |
Martin Schwidefsky | 2ba2a30 | 2009-08-14 15:47:29 +0200 | [diff] [blame] | 162 | /* Timekeeper helper functions. */ |
Stephen Warren | 7b1f620 | 2012-11-07 17:58:54 -0700 | [diff] [blame] | 163 | |
| 164 | #ifdef CONFIG_ARCH_USES_GETTIMEOFFSET |
Thomas Gleixner | e06fde3 | 2014-07-16 21:03:50 +0000 | [diff] [blame] | 165 | static u32 default_arch_gettimeoffset(void) { return 0; } |
| 166 | u32 (*arch_gettimeoffset)(void) = default_arch_gettimeoffset; |
Stephen Warren | 7b1f620 | 2012-11-07 17:58:54 -0700 | [diff] [blame] | 167 | #else |
Thomas Gleixner | e06fde3 | 2014-07-16 21:03:50 +0000 | [diff] [blame] | 168 | static inline u32 arch_gettimeoffset(void) { return 0; } |
Stephen Warren | 7b1f620 | 2012-11-07 17:58:54 -0700 | [diff] [blame] | 169 | #endif |
| 170 | |
John Stultz | f726a69 | 2012-07-13 01:21:57 -0400 | [diff] [blame] | 171 | static inline s64 timekeeping_get_ns(struct timekeeper *tk) |
Martin Schwidefsky | 2ba2a30 | 2009-08-14 15:47:29 +0200 | [diff] [blame] | 172 | { |
| 173 | cycle_t cycle_now, cycle_delta; |
| 174 | struct clocksource *clock; |
John Stultz | 1e75fa8 | 2012-07-13 01:21:53 -0400 | [diff] [blame] | 175 | s64 nsec; |
Martin Schwidefsky | 2ba2a30 | 2009-08-14 15:47:29 +0200 | [diff] [blame] | 176 | |
| 177 | /* read clocksource: */ |
John Stultz | f726a69 | 2012-07-13 01:21:57 -0400 | [diff] [blame] | 178 | clock = tk->clock; |
Martin Schwidefsky | 2ba2a30 | 2009-08-14 15:47:29 +0200 | [diff] [blame] | 179 | cycle_now = clock->read(clock); |
| 180 | |
| 181 | /* calculate the delta since the last update_wall_time: */ |
| 182 | cycle_delta = (cycle_now - clock->cycle_last) & clock->mask; |
| 183 | |
John Stultz | f726a69 | 2012-07-13 01:21:57 -0400 | [diff] [blame] | 184 | nsec = cycle_delta * tk->mult + tk->xtime_nsec; |
| 185 | nsec >>= tk->shift; |
John Stultz | f2a5a08 | 2012-07-13 01:21:55 -0400 | [diff] [blame] | 186 | |
Stephen Warren | 7b1f620 | 2012-11-07 17:58:54 -0700 | [diff] [blame] | 187 | /* If arch requires, add in get_arch_timeoffset() */ |
Thomas Gleixner | e06fde3 | 2014-07-16 21:03:50 +0000 | [diff] [blame] | 188 | return nsec + arch_gettimeoffset(); |
Martin Schwidefsky | 2ba2a30 | 2009-08-14 15:47:29 +0200 | [diff] [blame] | 189 | } |
| 190 | |
John Stultz | f726a69 | 2012-07-13 01:21:57 -0400 | [diff] [blame] | 191 | static inline s64 timekeeping_get_ns_raw(struct timekeeper *tk) |
Martin Schwidefsky | 2ba2a30 | 2009-08-14 15:47:29 +0200 | [diff] [blame] | 192 | { |
| 193 | cycle_t cycle_now, cycle_delta; |
| 194 | struct clocksource *clock; |
John Stultz | f2a5a08 | 2012-07-13 01:21:55 -0400 | [diff] [blame] | 195 | s64 nsec; |
Martin Schwidefsky | 2ba2a30 | 2009-08-14 15:47:29 +0200 | [diff] [blame] | 196 | |
| 197 | /* read clocksource: */ |
John Stultz | f726a69 | 2012-07-13 01:21:57 -0400 | [diff] [blame] | 198 | clock = tk->clock; |
Martin Schwidefsky | 2ba2a30 | 2009-08-14 15:47:29 +0200 | [diff] [blame] | 199 | cycle_now = clock->read(clock); |
| 200 | |
| 201 | /* calculate the delta since the last update_wall_time: */ |
| 202 | cycle_delta = (cycle_now - clock->cycle_last) & clock->mask; |
| 203 | |
John Stultz | f2a5a08 | 2012-07-13 01:21:55 -0400 | [diff] [blame] | 204 | /* convert delta to nanoseconds. */ |
| 205 | nsec = clocksource_cyc2ns(cycle_delta, clock->mult, clock->shift); |
| 206 | |
Stephen Warren | 7b1f620 | 2012-11-07 17:58:54 -0700 | [diff] [blame] | 207 | /* If arch requires, add in get_arch_timeoffset() */ |
Thomas Gleixner | e06fde3 | 2014-07-16 21:03:50 +0000 | [diff] [blame] | 208 | return nsec + arch_gettimeoffset(); |
Martin Schwidefsky | 2ba2a30 | 2009-08-14 15:47:29 +0200 | [diff] [blame] | 209 | } |
| 210 | |
Thomas Gleixner | c905fae | 2014-07-16 21:04:05 +0000 | [diff] [blame^] | 211 | #ifdef CONFIG_GENERIC_TIME_VSYSCALL_OLD |
| 212 | |
| 213 | static inline void update_vsyscall(struct timekeeper *tk) |
| 214 | { |
| 215 | struct timespec xt; |
| 216 | |
| 217 | xt = tk_xtime(tk); |
| 218 | update_vsyscall_old(&xt, &tk->wall_to_monotonic, tk->clock, tk->mult); |
| 219 | } |
| 220 | |
| 221 | static inline void old_vsyscall_fixup(struct timekeeper *tk) |
| 222 | { |
| 223 | s64 remainder; |
| 224 | |
| 225 | /* |
| 226 | * Store only full nanoseconds into xtime_nsec after rounding |
| 227 | * it up and add the remainder to the error difference. |
| 228 | * XXX - This is necessary to avoid small 1ns inconsistnecies caused |
| 229 | * by truncating the remainder in vsyscalls. However, it causes |
| 230 | * additional work to be done in timekeeping_adjust(). Once |
| 231 | * the vsyscall implementations are converted to use xtime_nsec |
| 232 | * (shifted nanoseconds), and CONFIG_GENERIC_TIME_VSYSCALL_OLD |
| 233 | * users are removed, this can be killed. |
| 234 | */ |
| 235 | remainder = tk->xtime_nsec & ((1ULL << tk->shift) - 1); |
| 236 | tk->xtime_nsec -= remainder; |
| 237 | tk->xtime_nsec += 1ULL << tk->shift; |
| 238 | tk->ntp_error += remainder << tk->ntp_error_shift; |
| 239 | tk->ntp_error -= (1ULL << tk->shift) << tk->ntp_error_shift; |
| 240 | } |
| 241 | #else |
| 242 | #define old_vsyscall_fixup(tk) |
| 243 | #endif |
| 244 | |
Marcelo Tosatti | e0b306f | 2012-11-27 23:28:59 -0200 | [diff] [blame] | 245 | static RAW_NOTIFIER_HEAD(pvclock_gtod_chain); |
| 246 | |
David Vrabel | 780427f | 2013-06-27 11:35:46 +0100 | [diff] [blame] | 247 | static void update_pvclock_gtod(struct timekeeper *tk, bool was_set) |
Marcelo Tosatti | e0b306f | 2012-11-27 23:28:59 -0200 | [diff] [blame] | 248 | { |
David Vrabel | 780427f | 2013-06-27 11:35:46 +0100 | [diff] [blame] | 249 | raw_notifier_call_chain(&pvclock_gtod_chain, was_set, tk); |
Marcelo Tosatti | e0b306f | 2012-11-27 23:28:59 -0200 | [diff] [blame] | 250 | } |
| 251 | |
| 252 | /** |
| 253 | * pvclock_gtod_register_notifier - register a pvclock timedata update listener |
Marcelo Tosatti | e0b306f | 2012-11-27 23:28:59 -0200 | [diff] [blame] | 254 | */ |
| 255 | int pvclock_gtod_register_notifier(struct notifier_block *nb) |
| 256 | { |
| 257 | struct timekeeper *tk = &timekeeper; |
| 258 | unsigned long flags; |
| 259 | int ret; |
| 260 | |
Thomas Gleixner | 9a7a71b | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 261 | raw_spin_lock_irqsave(&timekeeper_lock, flags); |
Marcelo Tosatti | e0b306f | 2012-11-27 23:28:59 -0200 | [diff] [blame] | 262 | ret = raw_notifier_chain_register(&pvclock_gtod_chain, nb); |
David Vrabel | 780427f | 2013-06-27 11:35:46 +0100 | [diff] [blame] | 263 | update_pvclock_gtod(tk, true); |
Thomas Gleixner | 9a7a71b | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 264 | raw_spin_unlock_irqrestore(&timekeeper_lock, flags); |
Marcelo Tosatti | e0b306f | 2012-11-27 23:28:59 -0200 | [diff] [blame] | 265 | |
| 266 | return ret; |
| 267 | } |
| 268 | EXPORT_SYMBOL_GPL(pvclock_gtod_register_notifier); |
| 269 | |
| 270 | /** |
| 271 | * pvclock_gtod_unregister_notifier - unregister a pvclock |
| 272 | * timedata update listener |
Marcelo Tosatti | e0b306f | 2012-11-27 23:28:59 -0200 | [diff] [blame] | 273 | */ |
| 274 | int pvclock_gtod_unregister_notifier(struct notifier_block *nb) |
| 275 | { |
Marcelo Tosatti | e0b306f | 2012-11-27 23:28:59 -0200 | [diff] [blame] | 276 | unsigned long flags; |
| 277 | int ret; |
| 278 | |
Thomas Gleixner | 9a7a71b | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 279 | raw_spin_lock_irqsave(&timekeeper_lock, flags); |
Marcelo Tosatti | e0b306f | 2012-11-27 23:28:59 -0200 | [diff] [blame] | 280 | ret = raw_notifier_chain_unregister(&pvclock_gtod_chain, nb); |
Thomas Gleixner | 9a7a71b | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 281 | raw_spin_unlock_irqrestore(&timekeeper_lock, flags); |
Marcelo Tosatti | e0b306f | 2012-11-27 23:28:59 -0200 | [diff] [blame] | 282 | |
| 283 | return ret; |
| 284 | } |
| 285 | EXPORT_SYMBOL_GPL(pvclock_gtod_unregister_notifier); |
| 286 | |
Thomas Gleixner | 9a7a71b | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 287 | /* must hold timekeeper_lock */ |
David Vrabel | 04397fe9 | 2013-06-27 11:35:45 +0100 | [diff] [blame] | 288 | static void timekeeping_update(struct timekeeper *tk, unsigned int action) |
Thomas Gleixner | cc06268 | 2011-11-13 23:19:49 +0000 | [diff] [blame] | 289 | { |
David Vrabel | 04397fe9 | 2013-06-27 11:35:45 +0100 | [diff] [blame] | 290 | if (action & TK_CLEAR_NTP) { |
John Stultz | f726a69 | 2012-07-13 01:21:57 -0400 | [diff] [blame] | 291 | tk->ntp_error = 0; |
Thomas Gleixner | cc06268 | 2011-11-13 23:19:49 +0000 | [diff] [blame] | 292 | ntp_clear(); |
| 293 | } |
John Stultz | 576094b | 2012-09-11 19:58:13 -0400 | [diff] [blame] | 294 | update_vsyscall(tk); |
David Vrabel | 780427f | 2013-06-27 11:35:46 +0100 | [diff] [blame] | 295 | update_pvclock_gtod(tk, action & TK_CLOCK_WAS_SET); |
Thomas Gleixner | 48cdc13 | 2013-02-21 22:51:40 +0000 | [diff] [blame] | 296 | |
David Vrabel | 04397fe9 | 2013-06-27 11:35:45 +0100 | [diff] [blame] | 297 | if (action & TK_MIRROR) |
Thomas Gleixner | 48cdc13 | 2013-02-21 22:51:40 +0000 | [diff] [blame] | 298 | memcpy(&shadow_timekeeper, &timekeeper, sizeof(timekeeper)); |
Thomas Gleixner | cc06268 | 2011-11-13 23:19:49 +0000 | [diff] [blame] | 299 | } |
| 300 | |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 301 | /** |
Martin Schwidefsky | 155ec60 | 2009-08-14 15:47:26 +0200 | [diff] [blame] | 302 | * timekeeping_forward_now - update clock to the current time |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 303 | * |
Roman Zippel | 9a05511 | 2008-08-20 16:37:28 -0700 | [diff] [blame] | 304 | * Forward the current clock to update its state since the last call to |
| 305 | * update_wall_time(). This is useful before significant clock changes, |
| 306 | * as it avoids having to deal with this time offset explicitly. |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 307 | */ |
John Stultz | f726a69 | 2012-07-13 01:21:57 -0400 | [diff] [blame] | 308 | static void timekeeping_forward_now(struct timekeeper *tk) |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 309 | { |
| 310 | cycle_t cycle_now, cycle_delta; |
Martin Schwidefsky | 155ec60 | 2009-08-14 15:47:26 +0200 | [diff] [blame] | 311 | struct clocksource *clock; |
Roman Zippel | 9a05511 | 2008-08-20 16:37:28 -0700 | [diff] [blame] | 312 | s64 nsec; |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 313 | |
John Stultz | f726a69 | 2012-07-13 01:21:57 -0400 | [diff] [blame] | 314 | clock = tk->clock; |
Martin Schwidefsky | a0f7d48 | 2009-08-14 15:47:19 +0200 | [diff] [blame] | 315 | cycle_now = clock->read(clock); |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 316 | cycle_delta = (cycle_now - clock->cycle_last) & clock->mask; |
Thomas Gleixner | 14a3b6a | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 317 | tk->cycle_last = clock->cycle_last = cycle_now; |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 318 | |
John Stultz | f726a69 | 2012-07-13 01:21:57 -0400 | [diff] [blame] | 319 | tk->xtime_nsec += cycle_delta * tk->mult; |
john stultz | 7d27558 | 2009-05-01 13:10:26 -0700 | [diff] [blame] | 320 | |
Stephen Warren | 7b1f620 | 2012-11-07 17:58:54 -0700 | [diff] [blame] | 321 | /* If arch requires, add in get_arch_timeoffset() */ |
Thomas Gleixner | e06fde3 | 2014-07-16 21:03:50 +0000 | [diff] [blame] | 322 | tk->xtime_nsec += (u64)arch_gettimeoffset() << tk->shift; |
john stultz | 7d27558 | 2009-05-01 13:10:26 -0700 | [diff] [blame] | 323 | |
John Stultz | f726a69 | 2012-07-13 01:21:57 -0400 | [diff] [blame] | 324 | tk_normalize_xtime(tk); |
John Stultz | 2d42244 | 2008-08-20 16:37:30 -0700 | [diff] [blame] | 325 | |
Martin Schwidefsky | 0a54419 | 2009-08-14 15:47:28 +0200 | [diff] [blame] | 326 | nsec = clocksource_cyc2ns(cycle_delta, clock->mult, clock->shift); |
John Stultz | 7d489d1 | 2014-07-16 21:04:01 +0000 | [diff] [blame] | 327 | timespec64_add_ns(&tk->raw_time, nsec); |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 328 | } |
| 329 | |
| 330 | /** |
Thomas Gleixner | d6d2989 | 2014-07-16 21:04:04 +0000 | [diff] [blame] | 331 | * __getnstimeofday64 - Returns the time of day in a timespec64. |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 332 | * @ts: pointer to the timespec to be set |
| 333 | * |
Kees Cook | 1e817fb | 2012-11-19 10:26:16 -0800 | [diff] [blame] | 334 | * Updates the time of day in the timespec. |
| 335 | * Returns 0 on success, or -ve when suspended (timespec will be undefined). |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 336 | */ |
Thomas Gleixner | d6d2989 | 2014-07-16 21:04:04 +0000 | [diff] [blame] | 337 | int __getnstimeofday64(struct timespec64 *ts) |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 338 | { |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 339 | struct timekeeper *tk = &timekeeper; |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 340 | unsigned long seq; |
John Stultz | 1e75fa8 | 2012-07-13 01:21:53 -0400 | [diff] [blame] | 341 | s64 nsecs = 0; |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 342 | |
| 343 | do { |
Thomas Gleixner | 9a7a71b | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 344 | seq = read_seqcount_begin(&timekeeper_seq); |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 345 | |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 346 | ts->tv_sec = tk->xtime_sec; |
John Stultz | ec145ba | 2012-09-11 19:26:03 -0400 | [diff] [blame] | 347 | nsecs = timekeeping_get_ns(tk); |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 348 | |
Thomas Gleixner | 9a7a71b | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 349 | } while (read_seqcount_retry(&timekeeper_seq, seq)); |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 350 | |
John Stultz | ec145ba | 2012-09-11 19:26:03 -0400 | [diff] [blame] | 351 | ts->tv_nsec = 0; |
Thomas Gleixner | d6d2989 | 2014-07-16 21:04:04 +0000 | [diff] [blame] | 352 | timespec64_add_ns(ts, nsecs); |
Kees Cook | 1e817fb | 2012-11-19 10:26:16 -0800 | [diff] [blame] | 353 | |
| 354 | /* |
| 355 | * Do not bail out early, in case there were callers still using |
| 356 | * the value, even in the face of the WARN_ON. |
| 357 | */ |
| 358 | if (unlikely(timekeeping_suspended)) |
| 359 | return -EAGAIN; |
| 360 | return 0; |
| 361 | } |
Thomas Gleixner | d6d2989 | 2014-07-16 21:04:04 +0000 | [diff] [blame] | 362 | EXPORT_SYMBOL(__getnstimeofday64); |
Kees Cook | 1e817fb | 2012-11-19 10:26:16 -0800 | [diff] [blame] | 363 | |
| 364 | /** |
Thomas Gleixner | d6d2989 | 2014-07-16 21:04:04 +0000 | [diff] [blame] | 365 | * getnstimeofday64 - Returns the time of day in a timespec64. |
Kees Cook | 1e817fb | 2012-11-19 10:26:16 -0800 | [diff] [blame] | 366 | * @ts: pointer to the timespec to be set |
| 367 | * |
| 368 | * Returns the time of day in a timespec (WARN if suspended). |
| 369 | */ |
Thomas Gleixner | d6d2989 | 2014-07-16 21:04:04 +0000 | [diff] [blame] | 370 | void getnstimeofday64(struct timespec64 *ts) |
Kees Cook | 1e817fb | 2012-11-19 10:26:16 -0800 | [diff] [blame] | 371 | { |
Thomas Gleixner | d6d2989 | 2014-07-16 21:04:04 +0000 | [diff] [blame] | 372 | WARN_ON(__getnstimeofday64(ts)); |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 373 | } |
Thomas Gleixner | d6d2989 | 2014-07-16 21:04:04 +0000 | [diff] [blame] | 374 | EXPORT_SYMBOL(getnstimeofday64); |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 375 | |
Martin Schwidefsky | 951ed4d | 2009-07-07 11:27:28 +0200 | [diff] [blame] | 376 | ktime_t ktime_get(void) |
| 377 | { |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 378 | struct timekeeper *tk = &timekeeper; |
Martin Schwidefsky | 951ed4d | 2009-07-07 11:27:28 +0200 | [diff] [blame] | 379 | unsigned int seq; |
| 380 | s64 secs, nsecs; |
| 381 | |
| 382 | WARN_ON(timekeeping_suspended); |
| 383 | |
| 384 | do { |
Thomas Gleixner | 9a7a71b | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 385 | seq = read_seqcount_begin(&timekeeper_seq); |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 386 | secs = tk->xtime_sec + tk->wall_to_monotonic.tv_sec; |
| 387 | nsecs = timekeeping_get_ns(tk) + tk->wall_to_monotonic.tv_nsec; |
Martin Schwidefsky | 951ed4d | 2009-07-07 11:27:28 +0200 | [diff] [blame] | 388 | |
Thomas Gleixner | 9a7a71b | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 389 | } while (read_seqcount_retry(&timekeeper_seq, seq)); |
John Stultz | 24e4a8c | 2014-07-16 21:03:53 +0000 | [diff] [blame] | 390 | |
| 391 | return ktime_set(secs, nsecs); |
Martin Schwidefsky | 951ed4d | 2009-07-07 11:27:28 +0200 | [diff] [blame] | 392 | } |
| 393 | EXPORT_SYMBOL_GPL(ktime_get); |
| 394 | |
| 395 | /** |
Thomas Gleixner | d6d2989 | 2014-07-16 21:04:04 +0000 | [diff] [blame] | 396 | * ktime_get_ts64 - get the monotonic clock in timespec64 format |
Martin Schwidefsky | 951ed4d | 2009-07-07 11:27:28 +0200 | [diff] [blame] | 397 | * @ts: pointer to timespec variable |
| 398 | * |
| 399 | * The function calculates the monotonic clock from the realtime |
| 400 | * clock and the wall_to_monotonic offset and stores the result |
| 401 | * in normalized timespec format in the variable pointed to by @ts. |
| 402 | */ |
Thomas Gleixner | d6d2989 | 2014-07-16 21:04:04 +0000 | [diff] [blame] | 403 | void ktime_get_ts64(struct timespec64 *ts) |
Martin Schwidefsky | 951ed4d | 2009-07-07 11:27:28 +0200 | [diff] [blame] | 404 | { |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 405 | struct timekeeper *tk = &timekeeper; |
Thomas Gleixner | d6d2989 | 2014-07-16 21:04:04 +0000 | [diff] [blame] | 406 | struct timespec64 tomono; |
John Stultz | ec145ba | 2012-09-11 19:26:03 -0400 | [diff] [blame] | 407 | s64 nsec; |
Martin Schwidefsky | 951ed4d | 2009-07-07 11:27:28 +0200 | [diff] [blame] | 408 | unsigned int seq; |
Martin Schwidefsky | 951ed4d | 2009-07-07 11:27:28 +0200 | [diff] [blame] | 409 | |
| 410 | WARN_ON(timekeeping_suspended); |
| 411 | |
| 412 | do { |
Thomas Gleixner | 9a7a71b | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 413 | seq = read_seqcount_begin(&timekeeper_seq); |
Thomas Gleixner | d6d2989 | 2014-07-16 21:04:04 +0000 | [diff] [blame] | 414 | ts->tv_sec = tk->xtime_sec; |
John Stultz | ec145ba | 2012-09-11 19:26:03 -0400 | [diff] [blame] | 415 | nsec = timekeeping_get_ns(tk); |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 416 | tomono = tk->wall_to_monotonic; |
Martin Schwidefsky | 951ed4d | 2009-07-07 11:27:28 +0200 | [diff] [blame] | 417 | |
Thomas Gleixner | 9a7a71b | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 418 | } while (read_seqcount_retry(&timekeeper_seq, seq)); |
Martin Schwidefsky | 951ed4d | 2009-07-07 11:27:28 +0200 | [diff] [blame] | 419 | |
Thomas Gleixner | d6d2989 | 2014-07-16 21:04:04 +0000 | [diff] [blame] | 420 | ts->tv_sec += tomono.tv_sec; |
| 421 | ts->tv_nsec = 0; |
| 422 | timespec64_add_ns(ts, nsec + tomono.tv_nsec); |
Martin Schwidefsky | 951ed4d | 2009-07-07 11:27:28 +0200 | [diff] [blame] | 423 | } |
Thomas Gleixner | d6d2989 | 2014-07-16 21:04:04 +0000 | [diff] [blame] | 424 | EXPORT_SYMBOL_GPL(ktime_get_ts64); |
Martin Schwidefsky | 951ed4d | 2009-07-07 11:27:28 +0200 | [diff] [blame] | 425 | |
John Stultz | 1ff3c96 | 2012-05-03 12:43:40 -0700 | [diff] [blame] | 426 | |
| 427 | /** |
| 428 | * timekeeping_clocktai - Returns the TAI time of day in a timespec |
| 429 | * @ts: pointer to the timespec to be set |
| 430 | * |
| 431 | * Returns the time of day in a timespec. |
| 432 | */ |
| 433 | void timekeeping_clocktai(struct timespec *ts) |
| 434 | { |
| 435 | struct timekeeper *tk = &timekeeper; |
John Stultz | 7d489d1 | 2014-07-16 21:04:01 +0000 | [diff] [blame] | 436 | struct timespec64 ts64; |
John Stultz | 1ff3c96 | 2012-05-03 12:43:40 -0700 | [diff] [blame] | 437 | unsigned long seq; |
| 438 | u64 nsecs; |
| 439 | |
| 440 | WARN_ON(timekeeping_suspended); |
| 441 | |
| 442 | do { |
Thomas Gleixner | 9a7a71b | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 443 | seq = read_seqcount_begin(&timekeeper_seq); |
John Stultz | 1ff3c96 | 2012-05-03 12:43:40 -0700 | [diff] [blame] | 444 | |
John Stultz | 7d489d1 | 2014-07-16 21:04:01 +0000 | [diff] [blame] | 445 | ts64.tv_sec = tk->xtime_sec + tk->tai_offset; |
John Stultz | 1ff3c96 | 2012-05-03 12:43:40 -0700 | [diff] [blame] | 446 | nsecs = timekeeping_get_ns(tk); |
| 447 | |
Thomas Gleixner | 9a7a71b | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 448 | } while (read_seqcount_retry(&timekeeper_seq, seq)); |
John Stultz | 1ff3c96 | 2012-05-03 12:43:40 -0700 | [diff] [blame] | 449 | |
John Stultz | 7d489d1 | 2014-07-16 21:04:01 +0000 | [diff] [blame] | 450 | ts64.tv_nsec = 0; |
| 451 | timespec64_add_ns(&ts64, nsecs); |
| 452 | *ts = timespec64_to_timespec(ts64); |
John Stultz | 1ff3c96 | 2012-05-03 12:43:40 -0700 | [diff] [blame] | 453 | |
| 454 | } |
| 455 | EXPORT_SYMBOL(timekeeping_clocktai); |
| 456 | |
| 457 | |
John Stultz | 90adda9 | 2013-01-21 17:00:11 -0800 | [diff] [blame] | 458 | /** |
| 459 | * ktime_get_clocktai - Returns the TAI time of day in a ktime |
| 460 | * |
| 461 | * Returns the time of day in a ktime. |
| 462 | */ |
| 463 | ktime_t ktime_get_clocktai(void) |
| 464 | { |
| 465 | struct timespec ts; |
| 466 | |
| 467 | timekeeping_clocktai(&ts); |
| 468 | return timespec_to_ktime(ts); |
| 469 | } |
| 470 | EXPORT_SYMBOL(ktime_get_clocktai); |
| 471 | |
Alexander Gordeev | e2c18e4 | 2011-01-12 17:00:57 -0800 | [diff] [blame] | 472 | #ifdef CONFIG_NTP_PPS |
| 473 | |
| 474 | /** |
| 475 | * getnstime_raw_and_real - get day and raw monotonic time in timespec format |
| 476 | * @ts_raw: pointer to the timespec to be set to raw monotonic time |
| 477 | * @ts_real: pointer to the timespec to be set to the time of day |
| 478 | * |
| 479 | * This function reads both the time of day and raw monotonic time at the |
| 480 | * same time atomically and stores the resulting timestamps in timespec |
| 481 | * format. |
| 482 | */ |
| 483 | void getnstime_raw_and_real(struct timespec *ts_raw, struct timespec *ts_real) |
| 484 | { |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 485 | struct timekeeper *tk = &timekeeper; |
Alexander Gordeev | e2c18e4 | 2011-01-12 17:00:57 -0800 | [diff] [blame] | 486 | unsigned long seq; |
| 487 | s64 nsecs_raw, nsecs_real; |
| 488 | |
| 489 | WARN_ON_ONCE(timekeeping_suspended); |
| 490 | |
| 491 | do { |
Thomas Gleixner | 9a7a71b | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 492 | seq = read_seqcount_begin(&timekeeper_seq); |
Alexander Gordeev | e2c18e4 | 2011-01-12 17:00:57 -0800 | [diff] [blame] | 493 | |
John Stultz | 7d489d1 | 2014-07-16 21:04:01 +0000 | [diff] [blame] | 494 | *ts_raw = timespec64_to_timespec(tk->raw_time); |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 495 | ts_real->tv_sec = tk->xtime_sec; |
John Stultz | 1e75fa8 | 2012-07-13 01:21:53 -0400 | [diff] [blame] | 496 | ts_real->tv_nsec = 0; |
Alexander Gordeev | e2c18e4 | 2011-01-12 17:00:57 -0800 | [diff] [blame] | 497 | |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 498 | nsecs_raw = timekeeping_get_ns_raw(tk); |
| 499 | nsecs_real = timekeeping_get_ns(tk); |
Alexander Gordeev | e2c18e4 | 2011-01-12 17:00:57 -0800 | [diff] [blame] | 500 | |
Thomas Gleixner | 9a7a71b | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 501 | } while (read_seqcount_retry(&timekeeper_seq, seq)); |
Alexander Gordeev | e2c18e4 | 2011-01-12 17:00:57 -0800 | [diff] [blame] | 502 | |
| 503 | timespec_add_ns(ts_raw, nsecs_raw); |
| 504 | timespec_add_ns(ts_real, nsecs_real); |
| 505 | } |
| 506 | EXPORT_SYMBOL(getnstime_raw_and_real); |
| 507 | |
| 508 | #endif /* CONFIG_NTP_PPS */ |
| 509 | |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 510 | /** |
| 511 | * do_gettimeofday - Returns the time of day in a timeval |
| 512 | * @tv: pointer to the timeval to be set |
| 513 | * |
Geert Uytterhoeven | efd9ac8 | 2008-01-30 13:30:01 +0100 | [diff] [blame] | 514 | * NOTE: Users should be converted to using getnstimeofday() |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 515 | */ |
| 516 | void do_gettimeofday(struct timeval *tv) |
| 517 | { |
Thomas Gleixner | d6d2989 | 2014-07-16 21:04:04 +0000 | [diff] [blame] | 518 | struct timespec64 now; |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 519 | |
Thomas Gleixner | d6d2989 | 2014-07-16 21:04:04 +0000 | [diff] [blame] | 520 | getnstimeofday64(&now); |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 521 | tv->tv_sec = now.tv_sec; |
| 522 | tv->tv_usec = now.tv_nsec/1000; |
| 523 | } |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 524 | EXPORT_SYMBOL(do_gettimeofday); |
Richard Cochran | d239f49 | 2012-04-27 10:12:42 +0200 | [diff] [blame] | 525 | |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 526 | /** |
| 527 | * do_settimeofday - Sets the time of day |
| 528 | * @tv: pointer to the timespec variable containing the new time |
| 529 | * |
| 530 | * Sets the time of day to the new time and update NTP and notify hrtimers |
| 531 | */ |
Richard Cochran | 1e6d767 | 2011-02-01 13:50:58 +0000 | [diff] [blame] | 532 | int do_settimeofday(const struct timespec *tv) |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 533 | { |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 534 | struct timekeeper *tk = &timekeeper; |
John Stultz | 7d489d1 | 2014-07-16 21:04:01 +0000 | [diff] [blame] | 535 | struct timespec64 ts_delta, xt, tmp; |
John Stultz | 92c1d3e | 2011-11-14 14:05:44 -0800 | [diff] [blame] | 536 | unsigned long flags; |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 537 | |
John Stultz | cee5848 | 2012-08-31 13:30:06 -0400 | [diff] [blame] | 538 | if (!timespec_valid_strict(tv)) |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 539 | return -EINVAL; |
| 540 | |
Thomas Gleixner | 9a7a71b | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 541 | raw_spin_lock_irqsave(&timekeeper_lock, flags); |
| 542 | write_seqcount_begin(&timekeeper_seq); |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 543 | |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 544 | timekeeping_forward_now(tk); |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 545 | |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 546 | xt = tk_xtime(tk); |
John Stultz | 1e75fa8 | 2012-07-13 01:21:53 -0400 | [diff] [blame] | 547 | ts_delta.tv_sec = tv->tv_sec - xt.tv_sec; |
| 548 | ts_delta.tv_nsec = tv->tv_nsec - xt.tv_nsec; |
| 549 | |
John Stultz | 7d489d1 | 2014-07-16 21:04:01 +0000 | [diff] [blame] | 550 | 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] | 551 | |
John Stultz | 7d489d1 | 2014-07-16 21:04:01 +0000 | [diff] [blame] | 552 | tmp = timespec_to_timespec64(*tv); |
| 553 | tk_set_xtime(tk, &tmp); |
John Stultz | 1e75fa8 | 2012-07-13 01:21:53 -0400 | [diff] [blame] | 554 | |
David Vrabel | 780427f | 2013-06-27 11:35:46 +0100 | [diff] [blame] | 555 | timekeeping_update(tk, TK_CLEAR_NTP | TK_MIRROR | TK_CLOCK_WAS_SET); |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 556 | |
Thomas Gleixner | 9a7a71b | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 557 | write_seqcount_end(&timekeeper_seq); |
| 558 | raw_spin_unlock_irqrestore(&timekeeper_lock, flags); |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 559 | |
| 560 | /* signal hrtimers about time change */ |
| 561 | clock_was_set(); |
| 562 | |
| 563 | return 0; |
| 564 | } |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 565 | EXPORT_SYMBOL(do_settimeofday); |
| 566 | |
John Stultz | c528f7c | 2011-02-01 13:52:17 +0000 | [diff] [blame] | 567 | /** |
| 568 | * timekeeping_inject_offset - Adds or subtracts from the current time. |
| 569 | * @tv: pointer to the timespec variable containing the offset |
| 570 | * |
| 571 | * Adds or subtracts an offset value from the current time. |
| 572 | */ |
| 573 | int timekeeping_inject_offset(struct timespec *ts) |
| 574 | { |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 575 | struct timekeeper *tk = &timekeeper; |
John Stultz | 92c1d3e | 2011-11-14 14:05:44 -0800 | [diff] [blame] | 576 | unsigned long flags; |
John Stultz | 7d489d1 | 2014-07-16 21:04:01 +0000 | [diff] [blame] | 577 | struct timespec64 ts64, tmp; |
John Stultz | 4e8b145 | 2012-08-08 15:36:20 -0400 | [diff] [blame] | 578 | int ret = 0; |
John Stultz | c528f7c | 2011-02-01 13:52:17 +0000 | [diff] [blame] | 579 | |
| 580 | if ((unsigned long)ts->tv_nsec >= NSEC_PER_SEC) |
| 581 | return -EINVAL; |
| 582 | |
John Stultz | 7d489d1 | 2014-07-16 21:04:01 +0000 | [diff] [blame] | 583 | ts64 = timespec_to_timespec64(*ts); |
| 584 | |
Thomas Gleixner | 9a7a71b | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 585 | raw_spin_lock_irqsave(&timekeeper_lock, flags); |
| 586 | write_seqcount_begin(&timekeeper_seq); |
John Stultz | c528f7c | 2011-02-01 13:52:17 +0000 | [diff] [blame] | 587 | |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 588 | timekeeping_forward_now(tk); |
John Stultz | c528f7c | 2011-02-01 13:52:17 +0000 | [diff] [blame] | 589 | |
John Stultz | 4e8b145 | 2012-08-08 15:36:20 -0400 | [diff] [blame] | 590 | /* Make sure the proposed value is valid */ |
John Stultz | 7d489d1 | 2014-07-16 21:04:01 +0000 | [diff] [blame] | 591 | tmp = timespec64_add(tk_xtime(tk), ts64); |
| 592 | if (!timespec64_valid_strict(&tmp)) { |
John Stultz | 4e8b145 | 2012-08-08 15:36:20 -0400 | [diff] [blame] | 593 | ret = -EINVAL; |
| 594 | goto error; |
| 595 | } |
John Stultz | 1e75fa8 | 2012-07-13 01:21:53 -0400 | [diff] [blame] | 596 | |
John Stultz | 7d489d1 | 2014-07-16 21:04:01 +0000 | [diff] [blame] | 597 | tk_xtime_add(tk, &ts64); |
| 598 | 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] | 599 | |
John Stultz | 4e8b145 | 2012-08-08 15:36:20 -0400 | [diff] [blame] | 600 | 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] | 601 | timekeeping_update(tk, TK_CLEAR_NTP | TK_MIRROR | TK_CLOCK_WAS_SET); |
John Stultz | c528f7c | 2011-02-01 13:52:17 +0000 | [diff] [blame] | 602 | |
Thomas Gleixner | 9a7a71b | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 603 | write_seqcount_end(&timekeeper_seq); |
| 604 | raw_spin_unlock_irqrestore(&timekeeper_lock, flags); |
John Stultz | c528f7c | 2011-02-01 13:52:17 +0000 | [diff] [blame] | 605 | |
| 606 | /* signal hrtimers about time change */ |
| 607 | clock_was_set(); |
| 608 | |
John Stultz | 4e8b145 | 2012-08-08 15:36:20 -0400 | [diff] [blame] | 609 | return ret; |
John Stultz | c528f7c | 2011-02-01 13:52:17 +0000 | [diff] [blame] | 610 | } |
| 611 | EXPORT_SYMBOL(timekeeping_inject_offset); |
| 612 | |
John Stultz | cc244dd | 2012-05-03 12:30:07 -0700 | [diff] [blame] | 613 | |
| 614 | /** |
| 615 | * timekeeping_get_tai_offset - Returns current TAI offset from UTC |
| 616 | * |
| 617 | */ |
| 618 | s32 timekeeping_get_tai_offset(void) |
| 619 | { |
| 620 | struct timekeeper *tk = &timekeeper; |
| 621 | unsigned int seq; |
| 622 | s32 ret; |
| 623 | |
| 624 | do { |
Thomas Gleixner | 9a7a71b | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 625 | seq = read_seqcount_begin(&timekeeper_seq); |
John Stultz | cc244dd | 2012-05-03 12:30:07 -0700 | [diff] [blame] | 626 | ret = tk->tai_offset; |
Thomas Gleixner | 9a7a71b | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 627 | } while (read_seqcount_retry(&timekeeper_seq, seq)); |
John Stultz | cc244dd | 2012-05-03 12:30:07 -0700 | [diff] [blame] | 628 | |
| 629 | return ret; |
| 630 | } |
| 631 | |
| 632 | /** |
| 633 | * __timekeeping_set_tai_offset - Lock free worker function |
| 634 | * |
| 635 | */ |
Fengguang Wu | dd5d70e | 2013-03-25 12:24:24 -0700 | [diff] [blame] | 636 | static void __timekeeping_set_tai_offset(struct timekeeper *tk, s32 tai_offset) |
John Stultz | cc244dd | 2012-05-03 12:30:07 -0700 | [diff] [blame] | 637 | { |
| 638 | tk->tai_offset = tai_offset; |
John Stultz | 04005f6 | 2013-12-10 17:13:35 -0800 | [diff] [blame] | 639 | 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] | 640 | } |
| 641 | |
| 642 | /** |
| 643 | * timekeeping_set_tai_offset - Sets the current TAI offset from UTC |
| 644 | * |
| 645 | */ |
| 646 | void timekeeping_set_tai_offset(s32 tai_offset) |
| 647 | { |
| 648 | struct timekeeper *tk = &timekeeper; |
| 649 | unsigned long flags; |
| 650 | |
Thomas Gleixner | 9a7a71b | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 651 | raw_spin_lock_irqsave(&timekeeper_lock, flags); |
| 652 | write_seqcount_begin(&timekeeper_seq); |
John Stultz | cc244dd | 2012-05-03 12:30:07 -0700 | [diff] [blame] | 653 | __timekeeping_set_tai_offset(tk, tai_offset); |
John Stultz | f55c076 | 2013-12-11 18:50:25 -0800 | [diff] [blame] | 654 | timekeeping_update(tk, TK_MIRROR | TK_CLOCK_WAS_SET); |
Thomas Gleixner | 9a7a71b | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 655 | write_seqcount_end(&timekeeper_seq); |
| 656 | raw_spin_unlock_irqrestore(&timekeeper_lock, flags); |
John Stultz | 4e8f8b3 | 2013-04-10 12:41:49 -0700 | [diff] [blame] | 657 | clock_was_set(); |
John Stultz | cc244dd | 2012-05-03 12:30:07 -0700 | [diff] [blame] | 658 | } |
| 659 | |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 660 | /** |
| 661 | * change_clocksource - Swaps clocksources if a new one is available |
| 662 | * |
| 663 | * Accumulates current time interval and initializes new clocksource |
| 664 | */ |
Martin Schwidefsky | 75c5158 | 2009-08-14 15:47:30 +0200 | [diff] [blame] | 665 | static int change_clocksource(void *data) |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 666 | { |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 667 | struct timekeeper *tk = &timekeeper; |
Magnus Damm | 4614e6a | 2009-04-21 12:24:02 -0700 | [diff] [blame] | 668 | struct clocksource *new, *old; |
John Stultz | f695cf9 | 2012-03-14 16:38:15 -0700 | [diff] [blame] | 669 | unsigned long flags; |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 670 | |
Martin Schwidefsky | 75c5158 | 2009-08-14 15:47:30 +0200 | [diff] [blame] | 671 | new = (struct clocksource *) data; |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 672 | |
Thomas Gleixner | 9a7a71b | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 673 | raw_spin_lock_irqsave(&timekeeper_lock, flags); |
| 674 | write_seqcount_begin(&timekeeper_seq); |
John Stultz | f695cf9 | 2012-03-14 16:38:15 -0700 | [diff] [blame] | 675 | |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 676 | timekeeping_forward_now(tk); |
Thomas Gleixner | 09ac369 | 2013-04-25 20:31:44 +0000 | [diff] [blame] | 677 | /* |
| 678 | * If the cs is in module, get a module reference. Succeeds |
| 679 | * for built-in code (owner == NULL) as well. |
| 680 | */ |
| 681 | if (try_module_get(new->owner)) { |
| 682 | if (!new->enable || new->enable(new) == 0) { |
| 683 | old = tk->clock; |
| 684 | tk_setup_internals(tk, new); |
| 685 | if (old->disable) |
| 686 | old->disable(old); |
| 687 | module_put(old->owner); |
| 688 | } else { |
| 689 | module_put(new->owner); |
| 690 | } |
Martin Schwidefsky | 75c5158 | 2009-08-14 15:47:30 +0200 | [diff] [blame] | 691 | } |
David Vrabel | 780427f | 2013-06-27 11:35:46 +0100 | [diff] [blame] | 692 | timekeeping_update(tk, TK_CLEAR_NTP | TK_MIRROR | TK_CLOCK_WAS_SET); |
John Stultz | f695cf9 | 2012-03-14 16:38:15 -0700 | [diff] [blame] | 693 | |
Thomas Gleixner | 9a7a71b | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 694 | write_seqcount_end(&timekeeper_seq); |
| 695 | raw_spin_unlock_irqrestore(&timekeeper_lock, flags); |
John Stultz | f695cf9 | 2012-03-14 16:38:15 -0700 | [diff] [blame] | 696 | |
Martin Schwidefsky | 75c5158 | 2009-08-14 15:47:30 +0200 | [diff] [blame] | 697 | return 0; |
| 698 | } |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 699 | |
Martin Schwidefsky | 75c5158 | 2009-08-14 15:47:30 +0200 | [diff] [blame] | 700 | /** |
| 701 | * timekeeping_notify - Install a new clock source |
| 702 | * @clock: pointer to the clock source |
| 703 | * |
| 704 | * This function is called from clocksource.c after a new, better clock |
| 705 | * source has been registered. The caller holds the clocksource_mutex. |
| 706 | */ |
Thomas Gleixner | ba919d1 | 2013-04-25 20:31:44 +0000 | [diff] [blame] | 707 | int timekeeping_notify(struct clocksource *clock) |
Martin Schwidefsky | 75c5158 | 2009-08-14 15:47:30 +0200 | [diff] [blame] | 708 | { |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 709 | struct timekeeper *tk = &timekeeper; |
| 710 | |
| 711 | if (tk->clock == clock) |
Thomas Gleixner | ba919d1 | 2013-04-25 20:31:44 +0000 | [diff] [blame] | 712 | return 0; |
Martin Schwidefsky | 75c5158 | 2009-08-14 15:47:30 +0200 | [diff] [blame] | 713 | stop_machine(change_clocksource, clock, NULL); |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 714 | tick_clock_notify(); |
Thomas Gleixner | ba919d1 | 2013-04-25 20:31:44 +0000 | [diff] [blame] | 715 | return tk->clock == clock ? 0 : -1; |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 716 | } |
Martin Schwidefsky | 75c5158 | 2009-08-14 15:47:30 +0200 | [diff] [blame] | 717 | |
Thomas Gleixner | a40f262 | 2009-07-07 13:00:31 +0200 | [diff] [blame] | 718 | /** |
| 719 | * ktime_get_real - get the real (wall-) time in ktime_t format |
| 720 | * |
| 721 | * returns the time in ktime_t format |
| 722 | */ |
| 723 | ktime_t ktime_get_real(void) |
| 724 | { |
Thomas Gleixner | d6d2989 | 2014-07-16 21:04:04 +0000 | [diff] [blame] | 725 | struct timespec64 now; |
Thomas Gleixner | a40f262 | 2009-07-07 13:00:31 +0200 | [diff] [blame] | 726 | |
Thomas Gleixner | d6d2989 | 2014-07-16 21:04:04 +0000 | [diff] [blame] | 727 | getnstimeofday64(&now); |
Thomas Gleixner | a40f262 | 2009-07-07 13:00:31 +0200 | [diff] [blame] | 728 | |
Thomas Gleixner | d6d2989 | 2014-07-16 21:04:04 +0000 | [diff] [blame] | 729 | return timespec64_to_ktime(now); |
Thomas Gleixner | a40f262 | 2009-07-07 13:00:31 +0200 | [diff] [blame] | 730 | } |
| 731 | EXPORT_SYMBOL_GPL(ktime_get_real); |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 732 | |
| 733 | /** |
John Stultz | 2d42244 | 2008-08-20 16:37:30 -0700 | [diff] [blame] | 734 | * getrawmonotonic - Returns the raw monotonic time in a timespec |
| 735 | * @ts: pointer to the timespec to be set |
| 736 | * |
| 737 | * Returns the raw monotonic time (completely un-modified by ntp) |
| 738 | */ |
| 739 | void getrawmonotonic(struct timespec *ts) |
| 740 | { |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 741 | struct timekeeper *tk = &timekeeper; |
John Stultz | 7d489d1 | 2014-07-16 21:04:01 +0000 | [diff] [blame] | 742 | struct timespec64 ts64; |
John Stultz | 2d42244 | 2008-08-20 16:37:30 -0700 | [diff] [blame] | 743 | unsigned long seq; |
| 744 | s64 nsecs; |
John Stultz | 2d42244 | 2008-08-20 16:37:30 -0700 | [diff] [blame] | 745 | |
| 746 | do { |
Thomas Gleixner | 9a7a71b | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 747 | seq = read_seqcount_begin(&timekeeper_seq); |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 748 | nsecs = timekeeping_get_ns_raw(tk); |
John Stultz | 7d489d1 | 2014-07-16 21:04:01 +0000 | [diff] [blame] | 749 | ts64 = tk->raw_time; |
John Stultz | 2d42244 | 2008-08-20 16:37:30 -0700 | [diff] [blame] | 750 | |
Thomas Gleixner | 9a7a71b | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 751 | } while (read_seqcount_retry(&timekeeper_seq, seq)); |
John Stultz | 2d42244 | 2008-08-20 16:37:30 -0700 | [diff] [blame] | 752 | |
John Stultz | 7d489d1 | 2014-07-16 21:04:01 +0000 | [diff] [blame] | 753 | timespec64_add_ns(&ts64, nsecs); |
| 754 | *ts = timespec64_to_timespec(ts64); |
John Stultz | 2d42244 | 2008-08-20 16:37:30 -0700 | [diff] [blame] | 755 | } |
| 756 | EXPORT_SYMBOL(getrawmonotonic); |
| 757 | |
John Stultz | 2d42244 | 2008-08-20 16:37:30 -0700 | [diff] [blame] | 758 | /** |
Li Zefan | cf4fc6c | 2008-02-08 04:19:24 -0800 | [diff] [blame] | 759 | * timekeeping_valid_for_hres - Check if timekeeping is suitable for hres |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 760 | */ |
Li Zefan | cf4fc6c | 2008-02-08 04:19:24 -0800 | [diff] [blame] | 761 | int timekeeping_valid_for_hres(void) |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 762 | { |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 763 | struct timekeeper *tk = &timekeeper; |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 764 | unsigned long seq; |
| 765 | int ret; |
| 766 | |
| 767 | do { |
Thomas Gleixner | 9a7a71b | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 768 | seq = read_seqcount_begin(&timekeeper_seq); |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 769 | |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 770 | ret = tk->clock->flags & CLOCK_SOURCE_VALID_FOR_HRES; |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 771 | |
Thomas Gleixner | 9a7a71b | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 772 | } while (read_seqcount_retry(&timekeeper_seq, seq)); |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 773 | |
| 774 | return ret; |
| 775 | } |
| 776 | |
| 777 | /** |
Jon Hunter | 9896246 | 2009-08-18 12:45:10 -0500 | [diff] [blame] | 778 | * timekeeping_max_deferment - Returns max time the clocksource can be deferred |
Jon Hunter | 9896246 | 2009-08-18 12:45:10 -0500 | [diff] [blame] | 779 | */ |
| 780 | u64 timekeeping_max_deferment(void) |
| 781 | { |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 782 | struct timekeeper *tk = &timekeeper; |
John Stultz | 70471f2 | 2011-11-14 12:48:10 -0800 | [diff] [blame] | 783 | unsigned long seq; |
| 784 | u64 ret; |
John Stultz | 42e71e8 | 2012-07-13 01:21:51 -0400 | [diff] [blame] | 785 | |
John Stultz | 70471f2 | 2011-11-14 12:48:10 -0800 | [diff] [blame] | 786 | do { |
Thomas Gleixner | 9a7a71b | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 787 | seq = read_seqcount_begin(&timekeeper_seq); |
John Stultz | 70471f2 | 2011-11-14 12:48:10 -0800 | [diff] [blame] | 788 | |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 789 | ret = tk->clock->max_idle_ns; |
John Stultz | 70471f2 | 2011-11-14 12:48:10 -0800 | [diff] [blame] | 790 | |
Thomas Gleixner | 9a7a71b | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 791 | } while (read_seqcount_retry(&timekeeper_seq, seq)); |
John Stultz | 70471f2 | 2011-11-14 12:48:10 -0800 | [diff] [blame] | 792 | |
| 793 | return ret; |
Jon Hunter | 9896246 | 2009-08-18 12:45:10 -0500 | [diff] [blame] | 794 | } |
| 795 | |
| 796 | /** |
Martin Schwidefsky | d4f587c | 2009-08-14 15:47:31 +0200 | [diff] [blame] | 797 | * read_persistent_clock - Return time from the persistent clock. |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 798 | * |
| 799 | * Weak dummy function for arches that do not yet support it. |
Martin Schwidefsky | d4f587c | 2009-08-14 15:47:31 +0200 | [diff] [blame] | 800 | * Reads the time from the battery backed persistent clock. |
| 801 | * 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] | 802 | * |
| 803 | * XXX - Do be sure to remove it once all arches implement it. |
| 804 | */ |
Gideon Israel Dsouza | 52f5684c | 2014-04-07 15:39:20 -0700 | [diff] [blame] | 805 | void __weak read_persistent_clock(struct timespec *ts) |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 806 | { |
Martin Schwidefsky | d4f587c | 2009-08-14 15:47:31 +0200 | [diff] [blame] | 807 | ts->tv_sec = 0; |
| 808 | ts->tv_nsec = 0; |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 809 | } |
| 810 | |
Martin Schwidefsky | 23970e3 | 2009-08-14 15:47:32 +0200 | [diff] [blame] | 811 | /** |
| 812 | * read_boot_clock - Return time of the system start. |
| 813 | * |
| 814 | * Weak dummy function for arches that do not yet support it. |
| 815 | * Function to read the exact time the system has been started. |
| 816 | * Returns a timespec with tv_sec=0 and tv_nsec=0 if unsupported. |
| 817 | * |
| 818 | * XXX - Do be sure to remove it once all arches implement it. |
| 819 | */ |
Gideon Israel Dsouza | 52f5684c | 2014-04-07 15:39:20 -0700 | [diff] [blame] | 820 | void __weak read_boot_clock(struct timespec *ts) |
Martin Schwidefsky | 23970e3 | 2009-08-14 15:47:32 +0200 | [diff] [blame] | 821 | { |
| 822 | ts->tv_sec = 0; |
| 823 | ts->tv_nsec = 0; |
| 824 | } |
| 825 | |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 826 | /* |
| 827 | * timekeeping_init - Initializes the clocksource and common timekeeping values |
| 828 | */ |
| 829 | void __init timekeeping_init(void) |
| 830 | { |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 831 | struct timekeeper *tk = &timekeeper; |
Martin Schwidefsky | 155ec60 | 2009-08-14 15:47:26 +0200 | [diff] [blame] | 832 | struct clocksource *clock; |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 833 | unsigned long flags; |
John Stultz | 7d489d1 | 2014-07-16 21:04:01 +0000 | [diff] [blame] | 834 | struct timespec64 now, boot, tmp; |
| 835 | struct timespec ts; |
Martin Schwidefsky | d4f587c | 2009-08-14 15:47:31 +0200 | [diff] [blame] | 836 | |
John Stultz | 7d489d1 | 2014-07-16 21:04:01 +0000 | [diff] [blame] | 837 | read_persistent_clock(&ts); |
| 838 | now = timespec_to_timespec64(ts); |
| 839 | if (!timespec64_valid_strict(&now)) { |
John Stultz | 4e8b145 | 2012-08-08 15:36:20 -0400 | [diff] [blame] | 840 | pr_warn("WARNING: Persistent clock returned invalid value!\n" |
| 841 | " Check your CMOS/BIOS settings.\n"); |
| 842 | now.tv_sec = 0; |
| 843 | now.tv_nsec = 0; |
Feng Tang | 31ade30 | 2013-01-16 00:09:47 +0800 | [diff] [blame] | 844 | } else if (now.tv_sec || now.tv_nsec) |
| 845 | persistent_clock_exist = true; |
John Stultz | 4e8b145 | 2012-08-08 15:36:20 -0400 | [diff] [blame] | 846 | |
John Stultz | 7d489d1 | 2014-07-16 21:04:01 +0000 | [diff] [blame] | 847 | read_boot_clock(&ts); |
| 848 | boot = timespec_to_timespec64(ts); |
| 849 | if (!timespec64_valid_strict(&boot)) { |
John Stultz | 4e8b145 | 2012-08-08 15:36:20 -0400 | [diff] [blame] | 850 | pr_warn("WARNING: Boot clock returned invalid value!\n" |
| 851 | " Check your CMOS/BIOS settings.\n"); |
| 852 | boot.tv_sec = 0; |
| 853 | boot.tv_nsec = 0; |
| 854 | } |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 855 | |
Thomas Gleixner | 9a7a71b | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 856 | raw_spin_lock_irqsave(&timekeeper_lock, flags); |
| 857 | write_seqcount_begin(&timekeeper_seq); |
John Stultz | 06c017f | 2013-03-22 11:37:28 -0700 | [diff] [blame] | 858 | ntp_init(); |
| 859 | |
Martin Schwidefsky | f1b8274 | 2009-08-14 15:47:21 +0200 | [diff] [blame] | 860 | clock = clocksource_default_clock(); |
Martin Schwidefsky | a0f7d48 | 2009-08-14 15:47:19 +0200 | [diff] [blame] | 861 | if (clock->enable) |
| 862 | clock->enable(clock); |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 863 | tk_setup_internals(tk, clock); |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 864 | |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 865 | tk_set_xtime(tk, &now); |
| 866 | tk->raw_time.tv_sec = 0; |
| 867 | tk->raw_time.tv_nsec = 0; |
John Stultz | 1e75fa8 | 2012-07-13 01:21:53 -0400 | [diff] [blame] | 868 | if (boot.tv_sec == 0 && boot.tv_nsec == 0) |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 869 | boot = tk_xtime(tk); |
John Stultz | 1e75fa8 | 2012-07-13 01:21:53 -0400 | [diff] [blame] | 870 | |
John Stultz | 7d489d1 | 2014-07-16 21:04:01 +0000 | [diff] [blame] | 871 | set_normalized_timespec64(&tmp, -boot.tv_sec, -boot.tv_nsec); |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 872 | tk_set_wall_to_mono(tk, tmp); |
John Stultz | 6d0ef90 | 2012-07-27 14:48:12 -0400 | [diff] [blame] | 873 | |
| 874 | tmp.tv_sec = 0; |
| 875 | tmp.tv_nsec = 0; |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 876 | tk_set_sleep_time(tk, tmp); |
John Stultz | 6d0ef90 | 2012-07-27 14:48:12 -0400 | [diff] [blame] | 877 | |
Thomas Gleixner | 48cdc13 | 2013-02-21 22:51:40 +0000 | [diff] [blame] | 878 | memcpy(&shadow_timekeeper, &timekeeper, sizeof(timekeeper)); |
| 879 | |
Thomas Gleixner | 9a7a71b | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 880 | write_seqcount_end(&timekeeper_seq); |
| 881 | raw_spin_unlock_irqrestore(&timekeeper_lock, flags); |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 882 | } |
| 883 | |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 884 | /* time in seconds when suspend began */ |
John Stultz | 7d489d1 | 2014-07-16 21:04:01 +0000 | [diff] [blame] | 885 | static struct timespec64 timekeeping_suspend_time; |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 886 | |
| 887 | /** |
John Stultz | 304529b | 2011-04-01 14:32:09 -0700 | [diff] [blame] | 888 | * __timekeeping_inject_sleeptime - Internal function to add sleep interval |
| 889 | * @delta: pointer to a timespec delta value |
| 890 | * |
| 891 | * Takes a timespec offset measuring a suspend interval and properly |
| 892 | * adds the sleep offset to the timekeeping variables. |
| 893 | */ |
John Stultz | f726a69 | 2012-07-13 01:21:57 -0400 | [diff] [blame] | 894 | static void __timekeeping_inject_sleeptime(struct timekeeper *tk, |
John Stultz | 7d489d1 | 2014-07-16 21:04:01 +0000 | [diff] [blame] | 895 | struct timespec64 *delta) |
John Stultz | 304529b | 2011-04-01 14:32:09 -0700 | [diff] [blame] | 896 | { |
John Stultz | 7d489d1 | 2014-07-16 21:04:01 +0000 | [diff] [blame] | 897 | if (!timespec64_valid_strict(delta)) { |
John Stultz | 6d9bcb6 | 2014-06-04 16:11:43 -0700 | [diff] [blame] | 898 | printk_deferred(KERN_WARNING |
| 899 | "__timekeeping_inject_sleeptime: Invalid " |
| 900 | "sleep delta value!\n"); |
John Stultz | cb5de2f8d | 2011-06-01 18:18:09 -0700 | [diff] [blame] | 901 | return; |
| 902 | } |
John Stultz | f726a69 | 2012-07-13 01:21:57 -0400 | [diff] [blame] | 903 | tk_xtime_add(tk, delta); |
John Stultz | 7d489d1 | 2014-07-16 21:04:01 +0000 | [diff] [blame] | 904 | tk_set_wall_to_mono(tk, timespec64_sub(tk->wall_to_monotonic, *delta)); |
| 905 | tk_set_sleep_time(tk, timespec64_add(tk->total_sleep_time, *delta)); |
Colin Cross | 5c83545 | 2013-05-21 22:32:14 -0700 | [diff] [blame] | 906 | tk_debug_account_sleep_time(delta); |
John Stultz | 304529b | 2011-04-01 14:32:09 -0700 | [diff] [blame] | 907 | } |
| 908 | |
John Stultz | 304529b | 2011-04-01 14:32:09 -0700 | [diff] [blame] | 909 | /** |
| 910 | * timekeeping_inject_sleeptime - Adds suspend interval to timeekeeping values |
| 911 | * @delta: pointer to a timespec delta value |
| 912 | * |
| 913 | * This hook is for architectures that cannot support read_persistent_clock |
| 914 | * because their RTC/persistent clock is only accessible when irqs are enabled. |
| 915 | * |
| 916 | * This function should only be called by rtc_resume(), and allows |
| 917 | * a suspend offset to be injected into the timekeeping values. |
| 918 | */ |
| 919 | void timekeeping_inject_sleeptime(struct timespec *delta) |
| 920 | { |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 921 | struct timekeeper *tk = &timekeeper; |
John Stultz | 7d489d1 | 2014-07-16 21:04:01 +0000 | [diff] [blame] | 922 | struct timespec64 tmp; |
John Stultz | 92c1d3e | 2011-11-14 14:05:44 -0800 | [diff] [blame] | 923 | unsigned long flags; |
John Stultz | 304529b | 2011-04-01 14:32:09 -0700 | [diff] [blame] | 924 | |
Feng Tang | 31ade30 | 2013-01-16 00:09:47 +0800 | [diff] [blame] | 925 | /* |
| 926 | * Make sure we don't set the clock twice, as timekeeping_resume() |
| 927 | * already did it |
| 928 | */ |
| 929 | if (has_persistent_clock()) |
John Stultz | 304529b | 2011-04-01 14:32:09 -0700 | [diff] [blame] | 930 | return; |
| 931 | |
Thomas Gleixner | 9a7a71b | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 932 | raw_spin_lock_irqsave(&timekeeper_lock, flags); |
| 933 | write_seqcount_begin(&timekeeper_seq); |
John Stultz | 70471f2 | 2011-11-14 12:48:10 -0800 | [diff] [blame] | 934 | |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 935 | timekeeping_forward_now(tk); |
John Stultz | 304529b | 2011-04-01 14:32:09 -0700 | [diff] [blame] | 936 | |
John Stultz | 7d489d1 | 2014-07-16 21:04:01 +0000 | [diff] [blame] | 937 | tmp = timespec_to_timespec64(*delta); |
| 938 | __timekeeping_inject_sleeptime(tk, &tmp); |
John Stultz | 304529b | 2011-04-01 14:32:09 -0700 | [diff] [blame] | 939 | |
David Vrabel | 780427f | 2013-06-27 11:35:46 +0100 | [diff] [blame] | 940 | timekeeping_update(tk, TK_CLEAR_NTP | TK_MIRROR | TK_CLOCK_WAS_SET); |
John Stultz | 304529b | 2011-04-01 14:32:09 -0700 | [diff] [blame] | 941 | |
Thomas Gleixner | 9a7a71b | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 942 | write_seqcount_end(&timekeeper_seq); |
| 943 | raw_spin_unlock_irqrestore(&timekeeper_lock, flags); |
John Stultz | 304529b | 2011-04-01 14:32:09 -0700 | [diff] [blame] | 944 | |
| 945 | /* signal hrtimers about time change */ |
| 946 | clock_was_set(); |
| 947 | } |
| 948 | |
John Stultz | 304529b | 2011-04-01 14:32:09 -0700 | [diff] [blame] | 949 | /** |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 950 | * timekeeping_resume - Resumes the generic timekeeping subsystem. |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 951 | * |
| 952 | * This is for the generic clocksource timekeeping. |
| 953 | * xtime/wall_to_monotonic/jiffies/etc are |
| 954 | * still managed by arch specific suspend/resume code. |
| 955 | */ |
Rafael J. Wysocki | e1a85b2 | 2011-03-23 22:16:04 +0100 | [diff] [blame] | 956 | static void timekeeping_resume(void) |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 957 | { |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 958 | struct timekeeper *tk = &timekeeper; |
Feng Tang | e445cf1 | 2013-03-12 11:56:48 +0800 | [diff] [blame] | 959 | struct clocksource *clock = tk->clock; |
John Stultz | 92c1d3e | 2011-11-14 14:05:44 -0800 | [diff] [blame] | 960 | unsigned long flags; |
John Stultz | 7d489d1 | 2014-07-16 21:04:01 +0000 | [diff] [blame] | 961 | struct timespec64 ts_new, ts_delta; |
| 962 | struct timespec tmp; |
Feng Tang | e445cf1 | 2013-03-12 11:56:48 +0800 | [diff] [blame] | 963 | cycle_t cycle_now, cycle_delta; |
| 964 | bool suspendtime_found = false; |
Martin Schwidefsky | d4f587c | 2009-08-14 15:47:31 +0200 | [diff] [blame] | 965 | |
John Stultz | 7d489d1 | 2014-07-16 21:04:01 +0000 | [diff] [blame] | 966 | read_persistent_clock(&tmp); |
| 967 | ts_new = timespec_to_timespec64(tmp); |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 968 | |
Rafael J. Wysocki | adc78e6 | 2012-08-06 01:40:41 +0200 | [diff] [blame] | 969 | clockevents_resume(); |
Thomas Gleixner | d10ff3f | 2007-05-14 11:10:02 +0200 | [diff] [blame] | 970 | clocksource_resume(); |
| 971 | |
Thomas Gleixner | 9a7a71b | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 972 | raw_spin_lock_irqsave(&timekeeper_lock, flags); |
| 973 | write_seqcount_begin(&timekeeper_seq); |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 974 | |
Feng Tang | e445cf1 | 2013-03-12 11:56:48 +0800 | [diff] [blame] | 975 | /* |
| 976 | * After system resumes, we need to calculate the suspended time and |
| 977 | * compensate it for the OS time. There are 3 sources that could be |
| 978 | * used: Nonstop clocksource during suspend, persistent clock and rtc |
| 979 | * device. |
| 980 | * |
| 981 | * One specific platform may have 1 or 2 or all of them, and the |
| 982 | * preference will be: |
| 983 | * suspend-nonstop clocksource -> persistent clock -> rtc |
| 984 | * The less preferred source will only be tried if there is no better |
| 985 | * usable source. The rtc part is handled separately in rtc core code. |
| 986 | */ |
| 987 | cycle_now = clock->read(clock); |
| 988 | if ((clock->flags & CLOCK_SOURCE_SUSPEND_NONSTOP) && |
| 989 | cycle_now > clock->cycle_last) { |
| 990 | u64 num, max = ULLONG_MAX; |
| 991 | u32 mult = clock->mult; |
| 992 | u32 shift = clock->shift; |
| 993 | s64 nsec = 0; |
| 994 | |
| 995 | cycle_delta = (cycle_now - clock->cycle_last) & clock->mask; |
| 996 | |
| 997 | /* |
| 998 | * "cycle_delta * mutl" may cause 64 bits overflow, if the |
| 999 | * suspended time is too long. In that case we need do the |
| 1000 | * 64 bits math carefully |
| 1001 | */ |
| 1002 | do_div(max, mult); |
| 1003 | if (cycle_delta > max) { |
| 1004 | num = div64_u64(cycle_delta, max); |
| 1005 | nsec = (((u64) max * mult) >> shift) * num; |
| 1006 | cycle_delta -= num * max; |
| 1007 | } |
| 1008 | nsec += ((u64) cycle_delta * mult) >> shift; |
| 1009 | |
John Stultz | 7d489d1 | 2014-07-16 21:04:01 +0000 | [diff] [blame] | 1010 | ts_delta = ns_to_timespec64(nsec); |
Feng Tang | e445cf1 | 2013-03-12 11:56:48 +0800 | [diff] [blame] | 1011 | suspendtime_found = true; |
John Stultz | 7d489d1 | 2014-07-16 21:04:01 +0000 | [diff] [blame] | 1012 | } else if (timespec64_compare(&ts_new, &timekeeping_suspend_time) > 0) { |
| 1013 | ts_delta = timespec64_sub(ts_new, timekeeping_suspend_time); |
Feng Tang | e445cf1 | 2013-03-12 11:56:48 +0800 | [diff] [blame] | 1014 | suspendtime_found = true; |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 1015 | } |
Feng Tang | e445cf1 | 2013-03-12 11:56:48 +0800 | [diff] [blame] | 1016 | |
| 1017 | if (suspendtime_found) |
| 1018 | __timekeeping_inject_sleeptime(tk, &ts_delta); |
| 1019 | |
| 1020 | /* Re-base the last cycle value */ |
Thomas Gleixner | 77c675b | 2013-04-22 09:37:04 +0200 | [diff] [blame] | 1021 | tk->cycle_last = clock->cycle_last = cycle_now; |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 1022 | tk->ntp_error = 0; |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 1023 | timekeeping_suspended = 0; |
David Vrabel | 780427f | 2013-06-27 11:35:46 +0100 | [diff] [blame] | 1024 | timekeeping_update(tk, TK_MIRROR | TK_CLOCK_WAS_SET); |
Thomas Gleixner | 9a7a71b | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 1025 | write_seqcount_end(&timekeeper_seq); |
| 1026 | raw_spin_unlock_irqrestore(&timekeeper_lock, flags); |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 1027 | |
| 1028 | touch_softlockup_watchdog(); |
| 1029 | |
| 1030 | clockevents_notify(CLOCK_EVT_NOTIFY_RESUME, NULL); |
| 1031 | |
| 1032 | /* Resume hrtimers */ |
Thomas Gleixner | b12a03c | 2011-05-02 16:48:57 +0200 | [diff] [blame] | 1033 | hrtimers_resume(); |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 1034 | } |
| 1035 | |
Rafael J. Wysocki | e1a85b2 | 2011-03-23 22:16:04 +0100 | [diff] [blame] | 1036 | static int timekeeping_suspend(void) |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 1037 | { |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 1038 | struct timekeeper *tk = &timekeeper; |
John Stultz | 92c1d3e | 2011-11-14 14:05:44 -0800 | [diff] [blame] | 1039 | unsigned long flags; |
John Stultz | 7d489d1 | 2014-07-16 21:04:01 +0000 | [diff] [blame] | 1040 | struct timespec64 delta, delta_delta; |
| 1041 | static struct timespec64 old_delta; |
| 1042 | struct timespec tmp; |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 1043 | |
John Stultz | 7d489d1 | 2014-07-16 21:04:01 +0000 | [diff] [blame] | 1044 | read_persistent_clock(&tmp); |
| 1045 | timekeeping_suspend_time = timespec_to_timespec64(tmp); |
Thomas Gleixner | 3be9095 | 2007-09-16 15:36:43 +0200 | [diff] [blame] | 1046 | |
Zoran Markovic | 0d6bd99 | 2013-05-17 11:24:05 -0700 | [diff] [blame] | 1047 | /* |
| 1048 | * On some systems the persistent_clock can not be detected at |
| 1049 | * timekeeping_init by its return value, so if we see a valid |
| 1050 | * value returned, update the persistent_clock_exists flag. |
| 1051 | */ |
| 1052 | if (timekeeping_suspend_time.tv_sec || timekeeping_suspend_time.tv_nsec) |
| 1053 | persistent_clock_exist = true; |
| 1054 | |
Thomas Gleixner | 9a7a71b | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 1055 | raw_spin_lock_irqsave(&timekeeper_lock, flags); |
| 1056 | write_seqcount_begin(&timekeeper_seq); |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 1057 | timekeeping_forward_now(tk); |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 1058 | timekeeping_suspended = 1; |
John Stultz | cb33217 | 2011-05-31 22:53:23 -0700 | [diff] [blame] | 1059 | |
| 1060 | /* |
| 1061 | * To avoid drift caused by repeated suspend/resumes, |
| 1062 | * which each can add ~1 second drift error, |
| 1063 | * try to compensate so the difference in system time |
| 1064 | * and persistent_clock time stays close to constant. |
| 1065 | */ |
John Stultz | 7d489d1 | 2014-07-16 21:04:01 +0000 | [diff] [blame] | 1066 | delta = timespec64_sub(tk_xtime(tk), timekeeping_suspend_time); |
| 1067 | delta_delta = timespec64_sub(delta, old_delta); |
John Stultz | cb33217 | 2011-05-31 22:53:23 -0700 | [diff] [blame] | 1068 | if (abs(delta_delta.tv_sec) >= 2) { |
| 1069 | /* |
| 1070 | * if delta_delta is too large, assume time correction |
| 1071 | * has occured and set old_delta to the current delta. |
| 1072 | */ |
| 1073 | old_delta = delta; |
| 1074 | } else { |
| 1075 | /* Otherwise try to adjust old_system to compensate */ |
| 1076 | timekeeping_suspend_time = |
John Stultz | 7d489d1 | 2014-07-16 21:04:01 +0000 | [diff] [blame] | 1077 | timespec64_add(timekeeping_suspend_time, delta_delta); |
John Stultz | cb33217 | 2011-05-31 22:53:23 -0700 | [diff] [blame] | 1078 | } |
John Stultz | 330a161 | 2013-12-11 19:10:36 -0800 | [diff] [blame] | 1079 | |
| 1080 | timekeeping_update(tk, TK_MIRROR); |
Thomas Gleixner | 9a7a71b | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 1081 | write_seqcount_end(&timekeeper_seq); |
| 1082 | raw_spin_unlock_irqrestore(&timekeeper_lock, flags); |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 1083 | |
| 1084 | clockevents_notify(CLOCK_EVT_NOTIFY_SUSPEND, NULL); |
Magnus Damm | c54a42b | 2010-02-02 14:41:41 -0800 | [diff] [blame] | 1085 | clocksource_suspend(); |
Rafael J. Wysocki | adc78e6 | 2012-08-06 01:40:41 +0200 | [diff] [blame] | 1086 | clockevents_suspend(); |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 1087 | |
| 1088 | return 0; |
| 1089 | } |
| 1090 | |
| 1091 | /* sysfs resume/suspend bits for timekeeping */ |
Rafael J. Wysocki | e1a85b2 | 2011-03-23 22:16:04 +0100 | [diff] [blame] | 1092 | static struct syscore_ops timekeeping_syscore_ops = { |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 1093 | .resume = timekeeping_resume, |
| 1094 | .suspend = timekeeping_suspend, |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 1095 | }; |
| 1096 | |
Rafael J. Wysocki | e1a85b2 | 2011-03-23 22:16:04 +0100 | [diff] [blame] | 1097 | static int __init timekeeping_init_ops(void) |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 1098 | { |
Rafael J. Wysocki | e1a85b2 | 2011-03-23 22:16:04 +0100 | [diff] [blame] | 1099 | register_syscore_ops(&timekeeping_syscore_ops); |
| 1100 | return 0; |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 1101 | } |
| 1102 | |
Rafael J. Wysocki | e1a85b2 | 2011-03-23 22:16:04 +0100 | [diff] [blame] | 1103 | device_initcall(timekeeping_init_ops); |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 1104 | |
| 1105 | /* |
| 1106 | * If the error is already larger, we look ahead even further |
| 1107 | * to compensate for late or lost adjustments. |
| 1108 | */ |
John Stultz | f726a69 | 2012-07-13 01:21:57 -0400 | [diff] [blame] | 1109 | static __always_inline int timekeeping_bigadjust(struct timekeeper *tk, |
| 1110 | s64 error, s64 *interval, |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 1111 | s64 *offset) |
| 1112 | { |
| 1113 | s64 tick_error, i; |
| 1114 | u32 look_ahead, adj; |
| 1115 | s32 error2, mult; |
| 1116 | |
| 1117 | /* |
| 1118 | * Use the current error value to determine how much to look ahead. |
| 1119 | * The larger the error the slower we adjust for it to avoid problems |
| 1120 | * with losing too many ticks, otherwise we would overadjust and |
| 1121 | * produce an even larger error. The smaller the adjustment the |
| 1122 | * 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] | 1123 | * 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] | 1124 | * within about 1 sec (or 2^20 nsec in 2^SHIFT_HZ ticks). |
| 1125 | */ |
John Stultz | f726a69 | 2012-07-13 01:21:57 -0400 | [diff] [blame] | 1126 | error2 = tk->ntp_error >> (NTP_SCALE_SHIFT + 22 - 2 * SHIFT_HZ); |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 1127 | error2 = abs(error2); |
| 1128 | for (look_ahead = 0; error2 > 0; look_ahead++) |
| 1129 | error2 >>= 2; |
| 1130 | |
| 1131 | /* |
| 1132 | * Now calculate the error in (1 << look_ahead) ticks, but first |
| 1133 | * remove the single look ahead already included in the error. |
| 1134 | */ |
John Stultz | f726a69 | 2012-07-13 01:21:57 -0400 | [diff] [blame] | 1135 | tick_error = ntp_tick_length() >> (tk->ntp_error_shift + 1); |
| 1136 | tick_error -= tk->xtime_interval >> 1; |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 1137 | error = ((error - tick_error) >> look_ahead) + tick_error; |
| 1138 | |
| 1139 | /* Finally calculate the adjustment shift value. */ |
| 1140 | i = *interval; |
| 1141 | mult = 1; |
| 1142 | if (error < 0) { |
| 1143 | error = -error; |
| 1144 | *interval = -*interval; |
| 1145 | *offset = -*offset; |
| 1146 | mult = -1; |
| 1147 | } |
| 1148 | for (adj = 0; error > i; adj++) |
| 1149 | error >>= 1; |
| 1150 | |
| 1151 | *interval <<= adj; |
| 1152 | *offset <<= adj; |
| 1153 | return mult << adj; |
| 1154 | } |
| 1155 | |
| 1156 | /* |
| 1157 | * Adjust the multiplier to reduce the error value, |
| 1158 | * this is optimized for the most common adjustments of -1,0,1, |
| 1159 | * for other values we can do a bit more work. |
| 1160 | */ |
John Stultz | f726a69 | 2012-07-13 01:21:57 -0400 | [diff] [blame] | 1161 | static void timekeeping_adjust(struct timekeeper *tk, s64 offset) |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 1162 | { |
John Stultz | f726a69 | 2012-07-13 01:21:57 -0400 | [diff] [blame] | 1163 | s64 error, interval = tk->cycle_interval; |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 1164 | int adj; |
| 1165 | |
John Stultz | c2bc111 | 2011-10-27 18:12:42 -0700 | [diff] [blame] | 1166 | /* |
Jim Cromie | 88b28ad | 2012-03-14 21:28:56 -0600 | [diff] [blame] | 1167 | * 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] | 1168 | * an interval. |
| 1169 | * |
| 1170 | * First we shift it down from NTP_SHIFT to clocksource->shifted nsecs. |
| 1171 | * |
| 1172 | * 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] | 1173 | * This "saves" dividing(shifting) interval twice, but keeps the |
| 1174 | * (error > interval) comparison as still measuring if error is |
Jim Cromie | 88b28ad | 2012-03-14 21:28:56 -0600 | [diff] [blame] | 1175 | * larger than half an interval. |
John Stultz | c2bc111 | 2011-10-27 18:12:42 -0700 | [diff] [blame] | 1176 | * |
John Stultz | 3f86f28 | 2011-10-27 17:41:17 -0700 | [diff] [blame] | 1177 | * Note: It does not "save" on aggravation when reading the code. |
John Stultz | c2bc111 | 2011-10-27 18:12:42 -0700 | [diff] [blame] | 1178 | */ |
John Stultz | f726a69 | 2012-07-13 01:21:57 -0400 | [diff] [blame] | 1179 | error = tk->ntp_error >> (tk->ntp_error_shift - 1); |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 1180 | if (error > interval) { |
John Stultz | c2bc111 | 2011-10-27 18:12:42 -0700 | [diff] [blame] | 1181 | /* |
| 1182 | * We now divide error by 4(via shift), which checks if |
Jim Cromie | 88b28ad | 2012-03-14 21:28:56 -0600 | [diff] [blame] | 1183 | * the error is greater than twice the interval. |
John Stultz | c2bc111 | 2011-10-27 18:12:42 -0700 | [diff] [blame] | 1184 | * If it is greater, we need a bigadjust, if its smaller, |
| 1185 | * we can adjust by 1. |
| 1186 | */ |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 1187 | error >>= 2; |
| 1188 | if (likely(error <= interval)) |
| 1189 | adj = 1; |
| 1190 | else |
Ingo Molnar | 1d17d17 | 2012-08-04 21:21:14 +0200 | [diff] [blame] | 1191 | adj = timekeeping_bigadjust(tk, error, &interval, &offset); |
| 1192 | } else { |
| 1193 | if (error < -interval) { |
| 1194 | /* See comment above, this is just switched for the negative */ |
| 1195 | error >>= 2; |
| 1196 | if (likely(error >= -interval)) { |
| 1197 | adj = -1; |
| 1198 | interval = -interval; |
| 1199 | offset = -offset; |
| 1200 | } else { |
| 1201 | adj = timekeeping_bigadjust(tk, error, &interval, &offset); |
| 1202 | } |
| 1203 | } else { |
| 1204 | goto out_adjust; |
| 1205 | } |
| 1206 | } |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 1207 | |
John Stultz | f726a69 | 2012-07-13 01:21:57 -0400 | [diff] [blame] | 1208 | if (unlikely(tk->clock->maxadj && |
| 1209 | (tk->mult + adj > tk->clock->mult + tk->clock->maxadj))) { |
John Stultz | 6d9bcb6 | 2014-06-04 16:11:43 -0700 | [diff] [blame] | 1210 | printk_deferred_once(KERN_WARNING |
John Stultz | e919cfd | 2012-03-22 19:14:46 -0700 | [diff] [blame] | 1211 | "Adjusting %s more than 11%% (%ld vs %ld)\n", |
John Stultz | f726a69 | 2012-07-13 01:21:57 -0400 | [diff] [blame] | 1212 | tk->clock->name, (long)tk->mult + adj, |
| 1213 | (long)tk->clock->mult + tk->clock->maxadj); |
John Stultz | e919cfd | 2012-03-22 19:14:46 -0700 | [diff] [blame] | 1214 | } |
John Stultz | c2bc111 | 2011-10-27 18:12:42 -0700 | [diff] [blame] | 1215 | /* |
| 1216 | * So the following can be confusing. |
| 1217 | * |
| 1218 | * To keep things simple, lets assume adj == 1 for now. |
| 1219 | * |
| 1220 | * When adj != 1, remember that the interval and offset values |
| 1221 | * have been appropriately scaled so the math is the same. |
| 1222 | * |
| 1223 | * The basic idea here is that we're increasing the multiplier |
| 1224 | * by one, this causes the xtime_interval to be incremented by |
| 1225 | * one cycle_interval. This is because: |
| 1226 | * xtime_interval = cycle_interval * mult |
| 1227 | * So if mult is being incremented by one: |
| 1228 | * xtime_interval = cycle_interval * (mult + 1) |
| 1229 | * Its the same as: |
| 1230 | * xtime_interval = (cycle_interval * mult) + cycle_interval |
| 1231 | * Which can be shortened to: |
| 1232 | * xtime_interval += cycle_interval |
| 1233 | * |
| 1234 | * So offset stores the non-accumulated cycles. Thus the current |
| 1235 | * time (in shifted nanoseconds) is: |
| 1236 | * now = (offset * adj) + xtime_nsec |
| 1237 | * Now, even though we're adjusting the clock frequency, we have |
| 1238 | * to keep time consistent. In other words, we can't jump back |
| 1239 | * in time, and we also want to avoid jumping forward in time. |
| 1240 | * |
| 1241 | * So given the same offset value, we need the time to be the same |
| 1242 | * both before and after the freq adjustment. |
| 1243 | * now = (offset * adj_1) + xtime_nsec_1 |
| 1244 | * now = (offset * adj_2) + xtime_nsec_2 |
| 1245 | * So: |
| 1246 | * (offset * adj_1) + xtime_nsec_1 = |
| 1247 | * (offset * adj_2) + xtime_nsec_2 |
| 1248 | * And we know: |
| 1249 | * adj_2 = adj_1 + 1 |
| 1250 | * So: |
| 1251 | * (offset * adj_1) + xtime_nsec_1 = |
| 1252 | * (offset * (adj_1+1)) + xtime_nsec_2 |
| 1253 | * (offset * adj_1) + xtime_nsec_1 = |
| 1254 | * (offset * adj_1) + offset + xtime_nsec_2 |
| 1255 | * Canceling the sides: |
| 1256 | * xtime_nsec_1 = offset + xtime_nsec_2 |
| 1257 | * Which gives us: |
| 1258 | * xtime_nsec_2 = xtime_nsec_1 - offset |
| 1259 | * Which simplfies to: |
| 1260 | * xtime_nsec -= offset |
| 1261 | * |
| 1262 | * XXX - TODO: Doc ntp_error calculation. |
| 1263 | */ |
John Stultz | f726a69 | 2012-07-13 01:21:57 -0400 | [diff] [blame] | 1264 | tk->mult += adj; |
| 1265 | tk->xtime_interval += interval; |
| 1266 | tk->xtime_nsec -= offset; |
| 1267 | tk->ntp_error -= (interval - offset) << tk->ntp_error_shift; |
John Stultz | 2a8c088 | 2012-07-13 01:21:56 -0400 | [diff] [blame] | 1268 | |
Ingo Molnar | 1d17d17 | 2012-08-04 21:21:14 +0200 | [diff] [blame] | 1269 | out_adjust: |
John Stultz | 2a8c088 | 2012-07-13 01:21:56 -0400 | [diff] [blame] | 1270 | /* |
| 1271 | * It may be possible that when we entered this function, xtime_nsec |
| 1272 | * was very small. Further, if we're slightly speeding the clocksource |
| 1273 | * in the code above, its possible the required corrective factor to |
| 1274 | * xtime_nsec could cause it to underflow. |
| 1275 | * |
| 1276 | * Now, since we already accumulated the second, cannot simply roll |
| 1277 | * the accumulated second back, since the NTP subsystem has been |
| 1278 | * notified via second_overflow. So instead we push xtime_nsec forward |
| 1279 | * by the amount we underflowed, and add that amount into the error. |
| 1280 | * |
| 1281 | * We'll correct this error next time through this function, when |
| 1282 | * xtime_nsec is not as small. |
| 1283 | */ |
John Stultz | f726a69 | 2012-07-13 01:21:57 -0400 | [diff] [blame] | 1284 | if (unlikely((s64)tk->xtime_nsec < 0)) { |
| 1285 | s64 neg = -(s64)tk->xtime_nsec; |
| 1286 | tk->xtime_nsec = 0; |
| 1287 | tk->ntp_error += neg << tk->ntp_error_shift; |
John Stultz | 2a8c088 | 2012-07-13 01:21:56 -0400 | [diff] [blame] | 1288 | } |
| 1289 | |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 1290 | } |
| 1291 | |
| 1292 | /** |
John Stultz | 1f4f948 | 2012-07-13 01:21:54 -0400 | [diff] [blame] | 1293 | * accumulate_nsecs_to_secs - Accumulates nsecs into secs |
| 1294 | * |
| 1295 | * Helper function that accumulates a the nsecs greater then a second |
| 1296 | * from the xtime_nsec field to the xtime_secs field. |
| 1297 | * It also calls into the NTP code to handle leapsecond processing. |
| 1298 | * |
| 1299 | */ |
David Vrabel | 780427f | 2013-06-27 11:35:46 +0100 | [diff] [blame] | 1300 | static inline unsigned int accumulate_nsecs_to_secs(struct timekeeper *tk) |
John Stultz | 1f4f948 | 2012-07-13 01:21:54 -0400 | [diff] [blame] | 1301 | { |
| 1302 | u64 nsecps = (u64)NSEC_PER_SEC << tk->shift; |
John Stultz | 5258d3f | 2013-12-11 20:07:49 -0800 | [diff] [blame] | 1303 | unsigned int clock_set = 0; |
John Stultz | 1f4f948 | 2012-07-13 01:21:54 -0400 | [diff] [blame] | 1304 | |
| 1305 | while (tk->xtime_nsec >= nsecps) { |
| 1306 | int leap; |
| 1307 | |
| 1308 | tk->xtime_nsec -= nsecps; |
| 1309 | tk->xtime_sec++; |
| 1310 | |
| 1311 | /* Figure out if its a leap sec and apply if needed */ |
| 1312 | leap = second_overflow(tk->xtime_sec); |
John Stultz | 6d0ef90 | 2012-07-27 14:48:12 -0400 | [diff] [blame] | 1313 | if (unlikely(leap)) { |
John Stultz | 7d489d1 | 2014-07-16 21:04:01 +0000 | [diff] [blame] | 1314 | struct timespec64 ts; |
John Stultz | 1f4f948 | 2012-07-13 01:21:54 -0400 | [diff] [blame] | 1315 | |
John Stultz | 6d0ef90 | 2012-07-27 14:48:12 -0400 | [diff] [blame] | 1316 | tk->xtime_sec += leap; |
| 1317 | |
| 1318 | ts.tv_sec = leap; |
| 1319 | ts.tv_nsec = 0; |
| 1320 | tk_set_wall_to_mono(tk, |
John Stultz | 7d489d1 | 2014-07-16 21:04:01 +0000 | [diff] [blame] | 1321 | timespec64_sub(tk->wall_to_monotonic, ts)); |
John Stultz | 6d0ef90 | 2012-07-27 14:48:12 -0400 | [diff] [blame] | 1322 | |
John Stultz | cc244dd | 2012-05-03 12:30:07 -0700 | [diff] [blame] | 1323 | __timekeeping_set_tai_offset(tk, tk->tai_offset - leap); |
| 1324 | |
John Stultz | 5258d3f | 2013-12-11 20:07:49 -0800 | [diff] [blame] | 1325 | clock_set = TK_CLOCK_WAS_SET; |
John Stultz | 6d0ef90 | 2012-07-27 14:48:12 -0400 | [diff] [blame] | 1326 | } |
John Stultz | 1f4f948 | 2012-07-13 01:21:54 -0400 | [diff] [blame] | 1327 | } |
John Stultz | 5258d3f | 2013-12-11 20:07:49 -0800 | [diff] [blame] | 1328 | return clock_set; |
John Stultz | 1f4f948 | 2012-07-13 01:21:54 -0400 | [diff] [blame] | 1329 | } |
| 1330 | |
John Stultz | 1f4f948 | 2012-07-13 01:21:54 -0400 | [diff] [blame] | 1331 | /** |
john stultz | a092ff0 | 2009-10-02 16:17:53 -0700 | [diff] [blame] | 1332 | * logarithmic_accumulation - shifted accumulation of cycles |
| 1333 | * |
| 1334 | * This functions accumulates a shifted interval of cycles into |
| 1335 | * into a shifted interval nanoseconds. Allows for O(log) accumulation |
| 1336 | * loop. |
| 1337 | * |
| 1338 | * Returns the unconsumed cycles. |
| 1339 | */ |
John Stultz | f726a69 | 2012-07-13 01:21:57 -0400 | [diff] [blame] | 1340 | static cycle_t logarithmic_accumulation(struct timekeeper *tk, cycle_t offset, |
John Stultz | 5258d3f | 2013-12-11 20:07:49 -0800 | [diff] [blame] | 1341 | u32 shift, |
| 1342 | unsigned int *clock_set) |
john stultz | a092ff0 | 2009-10-02 16:17:53 -0700 | [diff] [blame] | 1343 | { |
Thomas Gleixner | 23a9537 | 2013-02-21 22:51:36 +0000 | [diff] [blame] | 1344 | cycle_t interval = tk->cycle_interval << shift; |
Jason Wessel | deda2e8 | 2010-08-09 14:20:09 -0700 | [diff] [blame] | 1345 | u64 raw_nsecs; |
john stultz | a092ff0 | 2009-10-02 16:17:53 -0700 | [diff] [blame] | 1346 | |
John Stultz | f726a69 | 2012-07-13 01:21:57 -0400 | [diff] [blame] | 1347 | /* If the offset is smaller then a shifted interval, do nothing */ |
Thomas Gleixner | 23a9537 | 2013-02-21 22:51:36 +0000 | [diff] [blame] | 1348 | if (offset < interval) |
john stultz | a092ff0 | 2009-10-02 16:17:53 -0700 | [diff] [blame] | 1349 | return offset; |
| 1350 | |
| 1351 | /* Accumulate one shifted interval */ |
Thomas Gleixner | 23a9537 | 2013-02-21 22:51:36 +0000 | [diff] [blame] | 1352 | offset -= interval; |
Thomas Gleixner | 7ec98e1 | 2013-02-21 22:51:39 +0000 | [diff] [blame] | 1353 | tk->cycle_last += interval; |
john stultz | a092ff0 | 2009-10-02 16:17:53 -0700 | [diff] [blame] | 1354 | |
John Stultz | f726a69 | 2012-07-13 01:21:57 -0400 | [diff] [blame] | 1355 | tk->xtime_nsec += tk->xtime_interval << shift; |
John Stultz | 5258d3f | 2013-12-11 20:07:49 -0800 | [diff] [blame] | 1356 | *clock_set |= accumulate_nsecs_to_secs(tk); |
john stultz | a092ff0 | 2009-10-02 16:17:53 -0700 | [diff] [blame] | 1357 | |
Jason Wessel | deda2e8 | 2010-08-09 14:20:09 -0700 | [diff] [blame] | 1358 | /* Accumulate raw time */ |
Dan Carpenter | 5b3900c | 2012-10-09 10:18:23 +0300 | [diff] [blame] | 1359 | raw_nsecs = (u64)tk->raw_interval << shift; |
John Stultz | f726a69 | 2012-07-13 01:21:57 -0400 | [diff] [blame] | 1360 | raw_nsecs += tk->raw_time.tv_nsec; |
John Stultz | c7dcf87 | 2010-08-13 11:30:58 -0700 | [diff] [blame] | 1361 | if (raw_nsecs >= NSEC_PER_SEC) { |
| 1362 | u64 raw_secs = raw_nsecs; |
| 1363 | raw_nsecs = do_div(raw_secs, NSEC_PER_SEC); |
John Stultz | f726a69 | 2012-07-13 01:21:57 -0400 | [diff] [blame] | 1364 | tk->raw_time.tv_sec += raw_secs; |
john stultz | a092ff0 | 2009-10-02 16:17:53 -0700 | [diff] [blame] | 1365 | } |
John Stultz | f726a69 | 2012-07-13 01:21:57 -0400 | [diff] [blame] | 1366 | tk->raw_time.tv_nsec = raw_nsecs; |
john stultz | a092ff0 | 2009-10-02 16:17:53 -0700 | [diff] [blame] | 1367 | |
| 1368 | /* Accumulate error between NTP and clock interval */ |
John Stultz | f726a69 | 2012-07-13 01:21:57 -0400 | [diff] [blame] | 1369 | tk->ntp_error += ntp_tick_length() << shift; |
| 1370 | tk->ntp_error -= (tk->xtime_interval + tk->xtime_remainder) << |
| 1371 | (tk->ntp_error_shift + shift); |
john stultz | a092ff0 | 2009-10-02 16:17:53 -0700 | [diff] [blame] | 1372 | |
| 1373 | return offset; |
| 1374 | } |
| 1375 | |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 1376 | /** |
| 1377 | * update_wall_time - Uses the current clocksource to increment the wall time |
| 1378 | * |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 1379 | */ |
John Stultz | 47a1b796 | 2013-12-12 13:10:55 -0800 | [diff] [blame] | 1380 | void update_wall_time(void) |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 1381 | { |
Martin Schwidefsky | 155ec60 | 2009-08-14 15:47:26 +0200 | [diff] [blame] | 1382 | struct clocksource *clock; |
Thomas Gleixner | 48cdc13 | 2013-02-21 22:51:40 +0000 | [diff] [blame] | 1383 | struct timekeeper *real_tk = &timekeeper; |
| 1384 | struct timekeeper *tk = &shadow_timekeeper; |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 1385 | cycle_t offset; |
john stultz | a092ff0 | 2009-10-02 16:17:53 -0700 | [diff] [blame] | 1386 | int shift = 0, maxshift; |
John Stultz | 5258d3f | 2013-12-11 20:07:49 -0800 | [diff] [blame] | 1387 | unsigned int clock_set = 0; |
John Stultz | 70471f2 | 2011-11-14 12:48:10 -0800 | [diff] [blame] | 1388 | unsigned long flags; |
| 1389 | |
Thomas Gleixner | 9a7a71b | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 1390 | raw_spin_lock_irqsave(&timekeeper_lock, flags); |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 1391 | |
| 1392 | /* Make sure we're fully resumed: */ |
| 1393 | if (unlikely(timekeeping_suspended)) |
John Stultz | 70471f2 | 2011-11-14 12:48:10 -0800 | [diff] [blame] | 1394 | goto out; |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 1395 | |
Thomas Gleixner | 48cdc13 | 2013-02-21 22:51:40 +0000 | [diff] [blame] | 1396 | clock = real_tk->clock; |
John Stultz | 592913e | 2010-07-13 17:56:20 -0700 | [diff] [blame] | 1397 | |
| 1398 | #ifdef CONFIG_ARCH_USES_GETTIMEOFFSET |
Thomas Gleixner | 48cdc13 | 2013-02-21 22:51:40 +0000 | [diff] [blame] | 1399 | offset = real_tk->cycle_interval; |
John Stultz | 592913e | 2010-07-13 17:56:20 -0700 | [diff] [blame] | 1400 | #else |
| 1401 | offset = (clock->read(clock) - clock->cycle_last) & clock->mask; |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 1402 | #endif |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 1403 | |
John Stultz | bf2ac31 | 2012-08-21 20:30:49 -0400 | [diff] [blame] | 1404 | /* Check if there's really nothing to do */ |
Thomas Gleixner | 48cdc13 | 2013-02-21 22:51:40 +0000 | [diff] [blame] | 1405 | if (offset < real_tk->cycle_interval) |
John Stultz | bf2ac31 | 2012-08-21 20:30:49 -0400 | [diff] [blame] | 1406 | goto out; |
| 1407 | |
john stultz | a092ff0 | 2009-10-02 16:17:53 -0700 | [diff] [blame] | 1408 | /* |
| 1409 | * With NO_HZ we may have to accumulate many cycle_intervals |
| 1410 | * (think "ticks") worth of time at once. To do this efficiently, |
| 1411 | * we calculate the largest doubling multiple of cycle_intervals |
Jim Cromie | 88b28ad | 2012-03-14 21:28:56 -0600 | [diff] [blame] | 1412 | * that is smaller than the offset. We then accumulate that |
john stultz | a092ff0 | 2009-10-02 16:17:53 -0700 | [diff] [blame] | 1413 | * chunk in one go, and then try to consume the next smaller |
| 1414 | * doubled multiple. |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 1415 | */ |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 1416 | shift = ilog2(offset) - ilog2(tk->cycle_interval); |
john stultz | a092ff0 | 2009-10-02 16:17:53 -0700 | [diff] [blame] | 1417 | shift = max(0, shift); |
Jim Cromie | 88b28ad | 2012-03-14 21:28:56 -0600 | [diff] [blame] | 1418 | /* Bound shift to one less than what overflows tick_length */ |
John Stultz | ea7cf49 | 2011-11-14 13:18:07 -0800 | [diff] [blame] | 1419 | maxshift = (64 - (ilog2(ntp_tick_length())+1)) - 1; |
john stultz | a092ff0 | 2009-10-02 16:17:53 -0700 | [diff] [blame] | 1420 | shift = min(shift, maxshift); |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 1421 | while (offset >= tk->cycle_interval) { |
John Stultz | 5258d3f | 2013-12-11 20:07:49 -0800 | [diff] [blame] | 1422 | offset = logarithmic_accumulation(tk, offset, shift, |
| 1423 | &clock_set); |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 1424 | if (offset < tk->cycle_interval<<shift) |
John Stultz | 830ec04 | 2010-03-18 14:47:30 -0700 | [diff] [blame] | 1425 | shift--; |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 1426 | } |
| 1427 | |
| 1428 | /* correct the clock when NTP error is too big */ |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 1429 | timekeeping_adjust(tk, offset); |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 1430 | |
John Stultz | 6a867a3 | 2010-04-06 14:30:51 -0700 | [diff] [blame] | 1431 | /* |
John Stultz | 92bb1fc | 2012-09-04 15:38:12 -0400 | [diff] [blame] | 1432 | * XXX This can be killed once everyone converts |
| 1433 | * to the new update_vsyscall. |
| 1434 | */ |
| 1435 | old_vsyscall_fixup(tk); |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 1436 | |
John Stultz | 6a867a3 | 2010-04-06 14:30:51 -0700 | [diff] [blame] | 1437 | /* |
| 1438 | * Finally, make sure that after the rounding |
John Stultz | 1e75fa8 | 2012-07-13 01:21:53 -0400 | [diff] [blame] | 1439 | * xtime_nsec isn't larger than NSEC_PER_SEC |
John Stultz | 6a867a3 | 2010-04-06 14:30:51 -0700 | [diff] [blame] | 1440 | */ |
John Stultz | 5258d3f | 2013-12-11 20:07:49 -0800 | [diff] [blame] | 1441 | clock_set |= accumulate_nsecs_to_secs(tk); |
Linus Torvalds | 83f57a1 | 2009-12-22 14:10:37 -0800 | [diff] [blame] | 1442 | |
Thomas Gleixner | ca4523c | 2013-02-21 22:51:40 +0000 | [diff] [blame] | 1443 | write_seqcount_begin(&timekeeper_seq); |
Thomas Gleixner | 7ec98e1 | 2013-02-21 22:51:39 +0000 | [diff] [blame] | 1444 | /* Update clock->cycle_last with the new value */ |
| 1445 | clock->cycle_last = tk->cycle_last; |
Thomas Gleixner | 48cdc13 | 2013-02-21 22:51:40 +0000 | [diff] [blame] | 1446 | /* |
| 1447 | * Update the real timekeeper. |
| 1448 | * |
| 1449 | * We could avoid this memcpy by switching pointers, but that |
| 1450 | * requires changes to all other timekeeper usage sites as |
| 1451 | * well, i.e. move the timekeeper pointer getter into the |
| 1452 | * spinlocked/seqcount protected sections. And we trade this |
| 1453 | * memcpy under the timekeeper_seq against one before we start |
| 1454 | * updating. |
| 1455 | */ |
| 1456 | memcpy(real_tk, tk, sizeof(*tk)); |
John Stultz | 5258d3f | 2013-12-11 20:07:49 -0800 | [diff] [blame] | 1457 | timekeeping_update(real_tk, clock_set); |
Thomas Gleixner | 9a7a71b | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 1458 | write_seqcount_end(&timekeeper_seq); |
Thomas Gleixner | ca4523c | 2013-02-21 22:51:40 +0000 | [diff] [blame] | 1459 | out: |
Thomas Gleixner | 9a7a71b | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 1460 | raw_spin_unlock_irqrestore(&timekeeper_lock, flags); |
John Stultz | 47a1b796 | 2013-12-12 13:10:55 -0800 | [diff] [blame] | 1461 | if (clock_set) |
John Stultz | cab5e12 | 2014-03-27 16:30:49 -0700 | [diff] [blame] | 1462 | /* Have to call _delayed version, since in irq context*/ |
| 1463 | clock_was_set_delayed(); |
john stultz | 8524070 | 2007-05-08 00:27:59 -0700 | [diff] [blame] | 1464 | } |
Tomas Janousek | 7c3f1a5 | 2007-07-15 23:39:41 -0700 | [diff] [blame] | 1465 | |
| 1466 | /** |
| 1467 | * getboottime - Return the real time of system boot. |
| 1468 | * @ts: pointer to the timespec to be set |
| 1469 | * |
John Stultz | abb3a4e | 2011-02-14 17:52:09 -0800 | [diff] [blame] | 1470 | * Returns the wall-time of boot in a timespec. |
Tomas Janousek | 7c3f1a5 | 2007-07-15 23:39:41 -0700 | [diff] [blame] | 1471 | * |
| 1472 | * This is based on the wall_to_monotonic offset and the total suspend |
| 1473 | * time. Calls to settimeofday will affect the value returned (which |
| 1474 | * basically means that however wrong your real time clock is at boot time, |
| 1475 | * you get the right time here). |
| 1476 | */ |
| 1477 | void getboottime(struct timespec *ts) |
| 1478 | { |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 1479 | struct timekeeper *tk = &timekeeper; |
Hiroshi Shimamoto | 36d4748 | 2009-08-25 15:08:30 +0900 | [diff] [blame] | 1480 | struct timespec boottime = { |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 1481 | .tv_sec = tk->wall_to_monotonic.tv_sec + |
| 1482 | tk->total_sleep_time.tv_sec, |
| 1483 | .tv_nsec = tk->wall_to_monotonic.tv_nsec + |
| 1484 | tk->total_sleep_time.tv_nsec |
Hiroshi Shimamoto | 36d4748 | 2009-08-25 15:08:30 +0900 | [diff] [blame] | 1485 | }; |
Martin Schwidefsky | d4f587c | 2009-08-14 15:47:31 +0200 | [diff] [blame] | 1486 | |
Martin Schwidefsky | d4f587c | 2009-08-14 15:47:31 +0200 | [diff] [blame] | 1487 | set_normalized_timespec(ts, -boottime.tv_sec, -boottime.tv_nsec); |
Tomas Janousek | 7c3f1a5 | 2007-07-15 23:39:41 -0700 | [diff] [blame] | 1488 | } |
Jason Wang | c93d89f | 2010-01-27 19:13:40 +0800 | [diff] [blame] | 1489 | EXPORT_SYMBOL_GPL(getboottime); |
Tomas Janousek | 7c3f1a5 | 2007-07-15 23:39:41 -0700 | [diff] [blame] | 1490 | |
John Stultz | abb3a4e | 2011-02-14 17:52:09 -0800 | [diff] [blame] | 1491 | /** |
| 1492 | * get_monotonic_boottime - Returns monotonic time since boot |
| 1493 | * @ts: pointer to the timespec to be set |
| 1494 | * |
| 1495 | * Returns the monotonic time since boot in a timespec. |
| 1496 | * |
| 1497 | * This is similar to CLOCK_MONTONIC/ktime_get_ts, but also |
| 1498 | * includes the time spent in suspend. |
| 1499 | */ |
| 1500 | void get_monotonic_boottime(struct timespec *ts) |
| 1501 | { |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 1502 | struct timekeeper *tk = &timekeeper; |
John Stultz | 7d489d1 | 2014-07-16 21:04:01 +0000 | [diff] [blame] | 1503 | struct timespec64 tomono, sleep, ret; |
John Stultz | ec145ba | 2012-09-11 19:26:03 -0400 | [diff] [blame] | 1504 | s64 nsec; |
John Stultz | abb3a4e | 2011-02-14 17:52:09 -0800 | [diff] [blame] | 1505 | unsigned int seq; |
John Stultz | abb3a4e | 2011-02-14 17:52:09 -0800 | [diff] [blame] | 1506 | |
| 1507 | WARN_ON(timekeeping_suspended); |
| 1508 | |
| 1509 | do { |
Thomas Gleixner | 9a7a71b | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 1510 | seq = read_seqcount_begin(&timekeeper_seq); |
John Stultz | 7d489d1 | 2014-07-16 21:04:01 +0000 | [diff] [blame] | 1511 | ret.tv_sec = tk->xtime_sec; |
John Stultz | ec145ba | 2012-09-11 19:26:03 -0400 | [diff] [blame] | 1512 | nsec = timekeeping_get_ns(tk); |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 1513 | tomono = tk->wall_to_monotonic; |
| 1514 | sleep = tk->total_sleep_time; |
John Stultz | abb3a4e | 2011-02-14 17:52:09 -0800 | [diff] [blame] | 1515 | |
Thomas Gleixner | 9a7a71b | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 1516 | } while (read_seqcount_retry(&timekeeper_seq, seq)); |
John Stultz | abb3a4e | 2011-02-14 17:52:09 -0800 | [diff] [blame] | 1517 | |
John Stultz | 7d489d1 | 2014-07-16 21:04:01 +0000 | [diff] [blame] | 1518 | ret.tv_sec += tomono.tv_sec + sleep.tv_sec; |
| 1519 | ret.tv_nsec = 0; |
| 1520 | timespec64_add_ns(&ret, nsec + tomono.tv_nsec + sleep.tv_nsec); |
| 1521 | *ts = timespec64_to_timespec(ret); |
John Stultz | abb3a4e | 2011-02-14 17:52:09 -0800 | [diff] [blame] | 1522 | } |
| 1523 | EXPORT_SYMBOL_GPL(get_monotonic_boottime); |
| 1524 | |
| 1525 | /** |
| 1526 | * ktime_get_boottime - Returns monotonic time since boot in a ktime |
| 1527 | * |
| 1528 | * Returns the monotonic time since boot in a ktime |
| 1529 | * |
| 1530 | * This is similar to CLOCK_MONTONIC/ktime_get, but also |
| 1531 | * includes the time spent in suspend. |
| 1532 | */ |
| 1533 | ktime_t ktime_get_boottime(void) |
| 1534 | { |
| 1535 | struct timespec ts; |
| 1536 | |
| 1537 | get_monotonic_boottime(&ts); |
| 1538 | return timespec_to_ktime(ts); |
| 1539 | } |
| 1540 | EXPORT_SYMBOL_GPL(ktime_get_boottime); |
| 1541 | |
Tomas Janousek | 7c3f1a5 | 2007-07-15 23:39:41 -0700 | [diff] [blame] | 1542 | /** |
| 1543 | * monotonic_to_bootbased - Convert the monotonic time to boot based. |
| 1544 | * @ts: pointer to the timespec to be converted |
| 1545 | */ |
| 1546 | void monotonic_to_bootbased(struct timespec *ts) |
| 1547 | { |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 1548 | struct timekeeper *tk = &timekeeper; |
John Stultz | 7d489d1 | 2014-07-16 21:04:01 +0000 | [diff] [blame] | 1549 | struct timespec64 ts64; |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 1550 | |
John Stultz | 7d489d1 | 2014-07-16 21:04:01 +0000 | [diff] [blame] | 1551 | ts64 = timespec_to_timespec64(*ts); |
| 1552 | ts64 = timespec64_add(ts64, tk->total_sleep_time); |
| 1553 | *ts = timespec64_to_timespec(ts64); |
Tomas Janousek | 7c3f1a5 | 2007-07-15 23:39:41 -0700 | [diff] [blame] | 1554 | } |
Jason Wang | c93d89f | 2010-01-27 19:13:40 +0800 | [diff] [blame] | 1555 | EXPORT_SYMBOL_GPL(monotonic_to_bootbased); |
john stultz | 2c6b47d | 2007-07-24 17:47:43 -0700 | [diff] [blame] | 1556 | |
john stultz | 17c38b7 | 2007-07-24 18:38:34 -0700 | [diff] [blame] | 1557 | unsigned long get_seconds(void) |
| 1558 | { |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 1559 | struct timekeeper *tk = &timekeeper; |
| 1560 | |
| 1561 | return tk->xtime_sec; |
john stultz | 17c38b7 | 2007-07-24 18:38:34 -0700 | [diff] [blame] | 1562 | } |
| 1563 | EXPORT_SYMBOL(get_seconds); |
| 1564 | |
john stultz | da15cfd | 2009-08-19 19:13:34 -0700 | [diff] [blame] | 1565 | struct timespec __current_kernel_time(void) |
| 1566 | { |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 1567 | struct timekeeper *tk = &timekeeper; |
| 1568 | |
John Stultz | 7d489d1 | 2014-07-16 21:04:01 +0000 | [diff] [blame] | 1569 | return timespec64_to_timespec(tk_xtime(tk)); |
john stultz | da15cfd | 2009-08-19 19:13:34 -0700 | [diff] [blame] | 1570 | } |
john stultz | 17c38b7 | 2007-07-24 18:38:34 -0700 | [diff] [blame] | 1571 | |
john stultz | 2c6b47d | 2007-07-24 17:47:43 -0700 | [diff] [blame] | 1572 | struct timespec current_kernel_time(void) |
| 1573 | { |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 1574 | struct timekeeper *tk = &timekeeper; |
John Stultz | 7d489d1 | 2014-07-16 21:04:01 +0000 | [diff] [blame] | 1575 | struct timespec64 now; |
john stultz | 2c6b47d | 2007-07-24 17:47:43 -0700 | [diff] [blame] | 1576 | unsigned long seq; |
| 1577 | |
| 1578 | do { |
Thomas Gleixner | 9a7a71b | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 1579 | seq = read_seqcount_begin(&timekeeper_seq); |
Linus Torvalds | 83f57a1 | 2009-12-22 14:10:37 -0800 | [diff] [blame] | 1580 | |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 1581 | now = tk_xtime(tk); |
Thomas Gleixner | 9a7a71b | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 1582 | } while (read_seqcount_retry(&timekeeper_seq, seq)); |
john stultz | 2c6b47d | 2007-07-24 17:47:43 -0700 | [diff] [blame] | 1583 | |
John Stultz | 7d489d1 | 2014-07-16 21:04:01 +0000 | [diff] [blame] | 1584 | return timespec64_to_timespec(now); |
john stultz | 2c6b47d | 2007-07-24 17:47:43 -0700 | [diff] [blame] | 1585 | } |
john stultz | 2c6b47d | 2007-07-24 17:47:43 -0700 | [diff] [blame] | 1586 | EXPORT_SYMBOL(current_kernel_time); |
john stultz | da15cfd | 2009-08-19 19:13:34 -0700 | [diff] [blame] | 1587 | |
| 1588 | struct timespec get_monotonic_coarse(void) |
| 1589 | { |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 1590 | struct timekeeper *tk = &timekeeper; |
John Stultz | 7d489d1 | 2014-07-16 21:04:01 +0000 | [diff] [blame] | 1591 | struct timespec64 now, mono; |
john stultz | da15cfd | 2009-08-19 19:13:34 -0700 | [diff] [blame] | 1592 | unsigned long seq; |
| 1593 | |
| 1594 | do { |
Thomas Gleixner | 9a7a71b | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 1595 | seq = read_seqcount_begin(&timekeeper_seq); |
Linus Torvalds | 83f57a1 | 2009-12-22 14:10:37 -0800 | [diff] [blame] | 1596 | |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 1597 | now = tk_xtime(tk); |
| 1598 | mono = tk->wall_to_monotonic; |
Thomas Gleixner | 9a7a71b | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 1599 | } while (read_seqcount_retry(&timekeeper_seq, seq)); |
john stultz | da15cfd | 2009-08-19 19:13:34 -0700 | [diff] [blame] | 1600 | |
John Stultz | 7d489d1 | 2014-07-16 21:04:01 +0000 | [diff] [blame] | 1601 | set_normalized_timespec64(&now, now.tv_sec + mono.tv_sec, |
john stultz | da15cfd | 2009-08-19 19:13:34 -0700 | [diff] [blame] | 1602 | now.tv_nsec + mono.tv_nsec); |
John Stultz | 7d489d1 | 2014-07-16 21:04:01 +0000 | [diff] [blame] | 1603 | |
| 1604 | return timespec64_to_timespec(now); |
john stultz | da15cfd | 2009-08-19 19:13:34 -0700 | [diff] [blame] | 1605 | } |
Torben Hohn | 871cf1e | 2011-01-27 15:58:55 +0100 | [diff] [blame] | 1606 | |
| 1607 | /* |
John Stultz | d6ad418 | 2012-02-28 16:50:11 -0800 | [diff] [blame] | 1608 | * Must hold jiffies_lock |
Torben Hohn | 871cf1e | 2011-01-27 15:58:55 +0100 | [diff] [blame] | 1609 | */ |
| 1610 | void do_timer(unsigned long ticks) |
| 1611 | { |
| 1612 | jiffies_64 += ticks; |
Torben Hohn | 871cf1e | 2011-01-27 15:58:55 +0100 | [diff] [blame] | 1613 | calc_global_load(ticks); |
| 1614 | } |
Torben Hohn | 48cf76f7 | 2011-01-27 15:59:05 +0100 | [diff] [blame] | 1615 | |
| 1616 | /** |
John Stultz | 76f4108 | 2014-07-16 21:03:52 +0000 | [diff] [blame] | 1617 | * ktime_get_update_offsets_tick - hrtimer helper |
| 1618 | * @offs_real: pointer to storage for monotonic -> realtime offset |
| 1619 | * @offs_boot: pointer to storage for monotonic -> boottime offset |
| 1620 | * @offs_tai: pointer to storage for monotonic -> clock tai offset |
| 1621 | * |
| 1622 | * Returns monotonic time at last tick and various offsets |
Torben Hohn | 48cf76f7 | 2011-01-27 15:59:05 +0100 | [diff] [blame] | 1623 | */ |
John Stultz | 76f4108 | 2014-07-16 21:03:52 +0000 | [diff] [blame] | 1624 | ktime_t ktime_get_update_offsets_tick(ktime_t *offs_real, ktime_t *offs_boot, |
| 1625 | ktime_t *offs_tai) |
Torben Hohn | 48cf76f7 | 2011-01-27 15:59:05 +0100 | [diff] [blame] | 1626 | { |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 1627 | struct timekeeper *tk = &timekeeper; |
John Stultz | 7d489d1 | 2014-07-16 21:04:01 +0000 | [diff] [blame] | 1628 | struct timespec64 ts; |
John Stultz | 76f4108 | 2014-07-16 21:03:52 +0000 | [diff] [blame] | 1629 | ktime_t now; |
| 1630 | unsigned int seq; |
Torben Hohn | 48cf76f7 | 2011-01-27 15:59:05 +0100 | [diff] [blame] | 1631 | |
| 1632 | do { |
Thomas Gleixner | 9a7a71b | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 1633 | seq = read_seqcount_begin(&timekeeper_seq); |
John Stultz | 76f4108 | 2014-07-16 21:03:52 +0000 | [diff] [blame] | 1634 | |
| 1635 | ts = tk_xtime(tk); |
John Stultz | 76f4108 | 2014-07-16 21:03:52 +0000 | [diff] [blame] | 1636 | *offs_real = tk->offs_real; |
| 1637 | *offs_boot = tk->offs_boot; |
| 1638 | *offs_tai = tk->offs_tai; |
Thomas Gleixner | 9a7a71b | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 1639 | } while (read_seqcount_retry(&timekeeper_seq, seq)); |
John Stultz | 76f4108 | 2014-07-16 21:03:52 +0000 | [diff] [blame] | 1640 | |
| 1641 | now = ktime_set(ts.tv_sec, ts.tv_nsec); |
| 1642 | now = ktime_sub(now, *offs_real); |
| 1643 | return now; |
Torben Hohn | 48cf76f7 | 2011-01-27 15:59:05 +0100 | [diff] [blame] | 1644 | } |
Torben Hohn | f0af911a9 | 2011-01-27 15:59:10 +0100 | [diff] [blame] | 1645 | |
Thomas Gleixner | f6c06ab | 2012-07-10 18:43:24 -0400 | [diff] [blame] | 1646 | #ifdef CONFIG_HIGH_RES_TIMERS |
| 1647 | /** |
John Stultz | 76f4108 | 2014-07-16 21:03:52 +0000 | [diff] [blame] | 1648 | * ktime_get_update_offsets_now - hrtimer helper |
Thomas Gleixner | f6c06ab | 2012-07-10 18:43:24 -0400 | [diff] [blame] | 1649 | * @offs_real: pointer to storage for monotonic -> realtime offset |
| 1650 | * @offs_boot: pointer to storage for monotonic -> boottime offset |
Xie XiuQi | b7bc50e | 2013-10-18 09:13:30 +0800 | [diff] [blame] | 1651 | * @offs_tai: pointer to storage for monotonic -> clock tai offset |
Thomas Gleixner | f6c06ab | 2012-07-10 18:43:24 -0400 | [diff] [blame] | 1652 | * |
| 1653 | * Returns current monotonic time and updates the offsets |
Xie XiuQi | b7bc50e | 2013-10-18 09:13:30 +0800 | [diff] [blame] | 1654 | * Called from hrtimer_interrupt() or retrigger_next_event() |
Thomas Gleixner | f6c06ab | 2012-07-10 18:43:24 -0400 | [diff] [blame] | 1655 | */ |
John Stultz | 76f4108 | 2014-07-16 21:03:52 +0000 | [diff] [blame] | 1656 | 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] | 1657 | ktime_t *offs_tai) |
Thomas Gleixner | f6c06ab | 2012-07-10 18:43:24 -0400 | [diff] [blame] | 1658 | { |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 1659 | struct timekeeper *tk = &timekeeper; |
Thomas Gleixner | f6c06ab | 2012-07-10 18:43:24 -0400 | [diff] [blame] | 1660 | ktime_t now; |
| 1661 | unsigned int seq; |
| 1662 | u64 secs, nsecs; |
| 1663 | |
| 1664 | do { |
Thomas Gleixner | 9a7a71b | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 1665 | seq = read_seqcount_begin(&timekeeper_seq); |
Thomas Gleixner | f6c06ab | 2012-07-10 18:43:24 -0400 | [diff] [blame] | 1666 | |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 1667 | secs = tk->xtime_sec; |
| 1668 | nsecs = timekeeping_get_ns(tk); |
Thomas Gleixner | f6c06ab | 2012-07-10 18:43:24 -0400 | [diff] [blame] | 1669 | |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 1670 | *offs_real = tk->offs_real; |
| 1671 | *offs_boot = tk->offs_boot; |
John Stultz | 90adda9 | 2013-01-21 17:00:11 -0800 | [diff] [blame] | 1672 | *offs_tai = tk->offs_tai; |
Thomas Gleixner | 9a7a71b | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 1673 | } while (read_seqcount_retry(&timekeeper_seq, seq)); |
Thomas Gleixner | f6c06ab | 2012-07-10 18:43:24 -0400 | [diff] [blame] | 1674 | |
| 1675 | now = ktime_add_ns(ktime_set(secs, 0), nsecs); |
| 1676 | now = ktime_sub(now, *offs_real); |
| 1677 | return now; |
| 1678 | } |
| 1679 | #endif |
| 1680 | |
Torben Hohn | f0af911a9 | 2011-01-27 15:59:10 +0100 | [diff] [blame] | 1681 | /** |
Thomas Gleixner | 99ee531 | 2011-04-27 14:16:42 +0200 | [diff] [blame] | 1682 | * ktime_get_monotonic_offset() - get wall_to_monotonic in ktime_t format |
| 1683 | */ |
| 1684 | ktime_t ktime_get_monotonic_offset(void) |
| 1685 | { |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 1686 | struct timekeeper *tk = &timekeeper; |
Thomas Gleixner | 99ee531 | 2011-04-27 14:16:42 +0200 | [diff] [blame] | 1687 | unsigned long seq; |
John Stultz | 7d489d1 | 2014-07-16 21:04:01 +0000 | [diff] [blame] | 1688 | struct timespec64 wtom; |
Thomas Gleixner | 99ee531 | 2011-04-27 14:16:42 +0200 | [diff] [blame] | 1689 | |
| 1690 | do { |
Thomas Gleixner | 9a7a71b | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 1691 | seq = read_seqcount_begin(&timekeeper_seq); |
John Stultz | 4e250fd | 2012-07-27 14:48:13 -0400 | [diff] [blame] | 1692 | wtom = tk->wall_to_monotonic; |
Thomas Gleixner | 9a7a71b | 2013-02-21 22:51:38 +0000 | [diff] [blame] | 1693 | } while (read_seqcount_retry(&timekeeper_seq, seq)); |
John Stultz | 70471f2 | 2011-11-14 12:48:10 -0800 | [diff] [blame] | 1694 | |
John Stultz | 7d489d1 | 2014-07-16 21:04:01 +0000 | [diff] [blame] | 1695 | return timespec64_to_ktime(wtom); |
Thomas Gleixner | 99ee531 | 2011-04-27 14:16:42 +0200 | [diff] [blame] | 1696 | } |
John Stultz | a80b83b | 2012-02-03 00:19:07 -0800 | [diff] [blame] | 1697 | EXPORT_SYMBOL_GPL(ktime_get_monotonic_offset); |
| 1698 | |
Thomas Gleixner | 99ee531 | 2011-04-27 14:16:42 +0200 | [diff] [blame] | 1699 | /** |
John Stultz | aa6f9c59 | 2013-03-22 11:31:29 -0700 | [diff] [blame] | 1700 | * do_adjtimex() - Accessor function to NTP __do_adjtimex function |
| 1701 | */ |
| 1702 | int do_adjtimex(struct timex *txc) |
| 1703 | { |
John Stultz | 0b5154f | 2013-03-22 14:20:03 -0700 | [diff] [blame] | 1704 | struct timekeeper *tk = &timekeeper; |
John Stultz | 06c017f | 2013-03-22 11:37:28 -0700 | [diff] [blame] | 1705 | unsigned long flags; |
John Stultz | 7d489d1 | 2014-07-16 21:04:01 +0000 | [diff] [blame] | 1706 | struct timespec64 ts; |
John Stultz | 4e8f8b3 | 2013-04-10 12:41:49 -0700 | [diff] [blame] | 1707 | s32 orig_tai, tai; |
John Stultz | e408569 | 2013-03-22 12:08:52 -0700 | [diff] [blame] | 1708 | int ret; |
| 1709 | |
| 1710 | /* Validate the data before disabling interrupts */ |
| 1711 | ret = ntp_validate_timex(txc); |
| 1712 | if (ret) |
| 1713 | return ret; |
| 1714 | |
John Stultz | cef9037 | 2013-03-22 15:04:13 -0700 | [diff] [blame] | 1715 | if (txc->modes & ADJ_SETOFFSET) { |
| 1716 | struct timespec delta; |
| 1717 | delta.tv_sec = txc->time.tv_sec; |
| 1718 | delta.tv_nsec = txc->time.tv_usec; |
| 1719 | if (!(txc->modes & ADJ_NANO)) |
| 1720 | delta.tv_nsec *= 1000; |
| 1721 | ret = timekeeping_inject_offset(&delta); |
| 1722 | if (ret) |
| 1723 | return ret; |
| 1724 | } |
| 1725 | |
Thomas Gleixner | d6d2989 | 2014-07-16 21:04:04 +0000 | [diff] [blame] | 1726 | getnstimeofday64(&ts); |
John Stultz | aa6f9c59 | 2013-03-22 11:31:29 -0700 | [diff] [blame] | 1727 | |
John Stultz | 06c017f | 2013-03-22 11:37:28 -0700 | [diff] [blame] | 1728 | raw_spin_lock_irqsave(&timekeeper_lock, flags); |
| 1729 | write_seqcount_begin(&timekeeper_seq); |
| 1730 | |
John Stultz | 4e8f8b3 | 2013-04-10 12:41:49 -0700 | [diff] [blame] | 1731 | orig_tai = tai = tk->tai_offset; |
John Stultz | 87ace39 | 2013-03-22 12:28:15 -0700 | [diff] [blame] | 1732 | ret = __do_adjtimex(txc, &ts, &tai); |
| 1733 | |
John Stultz | 4e8f8b3 | 2013-04-10 12:41:49 -0700 | [diff] [blame] | 1734 | if (tai != orig_tai) { |
| 1735 | __timekeeping_set_tai_offset(tk, tai); |
John Stultz | f55c076 | 2013-12-11 18:50:25 -0800 | [diff] [blame] | 1736 | timekeeping_update(tk, TK_MIRROR | TK_CLOCK_WAS_SET); |
John Stultz | 4e8f8b3 | 2013-04-10 12:41:49 -0700 | [diff] [blame] | 1737 | } |
John Stultz | 06c017f | 2013-03-22 11:37:28 -0700 | [diff] [blame] | 1738 | write_seqcount_end(&timekeeper_seq); |
| 1739 | raw_spin_unlock_irqrestore(&timekeeper_lock, flags); |
| 1740 | |
John Stultz | 6fdda9a | 2013-12-10 17:18:18 -0800 | [diff] [blame] | 1741 | if (tai != orig_tai) |
| 1742 | clock_was_set(); |
| 1743 | |
John Stultz | 7bd3601 | 2013-09-11 16:50:56 -0700 | [diff] [blame] | 1744 | ntp_notify_cmos_timer(); |
| 1745 | |
John Stultz | 87ace39 | 2013-03-22 12:28:15 -0700 | [diff] [blame] | 1746 | return ret; |
| 1747 | } |
John Stultz | aa6f9c59 | 2013-03-22 11:31:29 -0700 | [diff] [blame] | 1748 | |
| 1749 | #ifdef CONFIG_NTP_PPS |
| 1750 | /** |
| 1751 | * hardpps() - Accessor function to NTP __hardpps function |
| 1752 | */ |
| 1753 | void hardpps(const struct timespec *phase_ts, const struct timespec *raw_ts) |
| 1754 | { |
John Stultz | 06c017f | 2013-03-22 11:37:28 -0700 | [diff] [blame] | 1755 | unsigned long flags; |
| 1756 | |
| 1757 | raw_spin_lock_irqsave(&timekeeper_lock, flags); |
| 1758 | write_seqcount_begin(&timekeeper_seq); |
| 1759 | |
John Stultz | aa6f9c59 | 2013-03-22 11:31:29 -0700 | [diff] [blame] | 1760 | __hardpps(phase_ts, raw_ts); |
John Stultz | 06c017f | 2013-03-22 11:37:28 -0700 | [diff] [blame] | 1761 | |
| 1762 | write_seqcount_end(&timekeeper_seq); |
| 1763 | raw_spin_unlock_irqrestore(&timekeeper_lock, flags); |
John Stultz | aa6f9c59 | 2013-03-22 11:31:29 -0700 | [diff] [blame] | 1764 | } |
| 1765 | EXPORT_SYMBOL(hardpps); |
| 1766 | #endif |
| 1767 | |
| 1768 | /** |
Torben Hohn | f0af911a9 | 2011-01-27 15:59:10 +0100 | [diff] [blame] | 1769 | * xtime_update() - advances the timekeeping infrastructure |
| 1770 | * @ticks: number of ticks, that have elapsed since the last call. |
| 1771 | * |
| 1772 | * Must be called with interrupts disabled. |
| 1773 | */ |
| 1774 | void xtime_update(unsigned long ticks) |
| 1775 | { |
John Stultz | d6ad418 | 2012-02-28 16:50:11 -0800 | [diff] [blame] | 1776 | write_seqlock(&jiffies_lock); |
Torben Hohn | f0af911a9 | 2011-01-27 15:59:10 +0100 | [diff] [blame] | 1777 | do_timer(ticks); |
John Stultz | d6ad418 | 2012-02-28 16:50:11 -0800 | [diff] [blame] | 1778 | write_sequnlock(&jiffies_lock); |
John Stultz | 47a1b796 | 2013-12-12 13:10:55 -0800 | [diff] [blame] | 1779 | update_wall_time(); |
Torben Hohn | f0af911a9 | 2011-01-27 15:59:10 +0100 | [diff] [blame] | 1780 | } |