Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 1 | /* |
| 2 | * include/linux/hrtimer.h |
| 3 | * |
| 4 | * hrtimers - High-resolution kernel timers |
| 5 | * |
| 6 | * Copyright(C) 2005, Thomas Gleixner <tglx@linutronix.de> |
| 7 | * Copyright(C) 2005, Red Hat, Inc., Ingo Molnar |
| 8 | * |
| 9 | * data type definitions, declarations, prototypes |
| 10 | * |
| 11 | * Started by: Thomas Gleixner and Ingo Molnar |
| 12 | * |
| 13 | * For licencing details see kernel-base/COPYING |
| 14 | */ |
| 15 | #ifndef _LINUX_HRTIMER_H |
| 16 | #define _LINUX_HRTIMER_H |
| 17 | |
| 18 | #include <linux/rbtree.h> |
| 19 | #include <linux/ktime.h> |
| 20 | #include <linux/init.h> |
| 21 | #include <linux/list.h> |
| 22 | #include <linux/wait.h> |
Stephen Rothwell | 40b8606 | 2008-10-15 14:20:28 +1100 | [diff] [blame] | 23 | #include <linux/percpu.h> |
Heiko Carstens | 507e123 | 2009-06-23 17:38:15 +0200 | [diff] [blame] | 24 | #include <linux/timer.h> |
John Stultz | 998adc3 | 2010-09-20 19:19:17 -0700 | [diff] [blame] | 25 | #include <linux/timerqueue.h> |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 26 | |
Thomas Gleixner | 3c8aa39 | 2007-02-16 01:27:50 -0800 | [diff] [blame] | 27 | struct hrtimer_clock_base; |
| 28 | struct hrtimer_cpu_base; |
| 29 | |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 30 | /* |
| 31 | * Mode arguments of xxx_hrtimer functions: |
| 32 | */ |
| 33 | enum hrtimer_mode { |
Arun R Bharadwaj | 597d027 | 2009-04-16 12:13:26 +0530 | [diff] [blame] | 34 | HRTIMER_MODE_ABS = 0x0, /* Time value is absolute */ |
| 35 | HRTIMER_MODE_REL = 0x1, /* Time value is relative to now */ |
| 36 | HRTIMER_MODE_PINNED = 0x02, /* Timer is bound to CPU */ |
| 37 | HRTIMER_MODE_ABS_PINNED = 0x02, |
| 38 | HRTIMER_MODE_REL_PINNED = 0x03, |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 39 | }; |
| 40 | |
Thomas Gleixner | c9cb2e3 | 2007-02-16 01:27:49 -0800 | [diff] [blame] | 41 | /* |
| 42 | * Return values for the callback function |
| 43 | */ |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 44 | enum hrtimer_restart { |
Thomas Gleixner | c9cb2e3 | 2007-02-16 01:27:49 -0800 | [diff] [blame] | 45 | HRTIMER_NORESTART, /* Timer is not restarted */ |
| 46 | HRTIMER_RESTART, /* Timer must be restarted */ |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 47 | }; |
| 48 | |
Thomas Gleixner | 303e967 | 2007-02-16 01:27:51 -0800 | [diff] [blame] | 49 | /* |
Thomas Gleixner | 54cdfdb | 2007-02-16 01:28:11 -0800 | [diff] [blame] | 50 | * Values to track state of the timer |
Thomas Gleixner | 303e967 | 2007-02-16 01:27:51 -0800 | [diff] [blame] | 51 | * |
| 52 | * Possible states: |
| 53 | * |
| 54 | * 0x00 inactive |
| 55 | * 0x01 enqueued into rbtree |
Thomas Gleixner | 54cdfdb | 2007-02-16 01:28:11 -0800 | [diff] [blame] | 56 | * |
Peter Zijlstra | 887d9dc | 2015-06-11 14:46:48 +0200 | [diff] [blame] | 57 | * The callback state is not part of the timer->state because clearing it would |
| 58 | * mean touching the timer after the callback, this makes it impossible to free |
| 59 | * the timer from the callback function. |
Thomas Gleixner | 53370d2 | 2011-03-10 18:26:33 +0100 | [diff] [blame] | 60 | * |
Peter Zijlstra | 887d9dc | 2015-06-11 14:46:48 +0200 | [diff] [blame] | 61 | * Therefore we track the callback state in: |
| 62 | * |
| 63 | * timer->base->cpu_base->running == timer |
| 64 | * |
| 65 | * On SMP it is possible to have a "callback function running and enqueued" |
| 66 | * status. It happens for example when a posix timer expired and the callback |
Thomas Gleixner | 303e967 | 2007-02-16 01:27:51 -0800 | [diff] [blame] | 67 | * queued a signal. Between dropping the lock which protects the posix timer |
| 68 | * and reacquiring the base lock of the hrtimer, another CPU can deliver the |
Peter Zijlstra | 887d9dc | 2015-06-11 14:46:48 +0200 | [diff] [blame] | 69 | * signal and rearm the timer. |
Thomas Gleixner | 303e967 | 2007-02-16 01:27:51 -0800 | [diff] [blame] | 70 | * |
| 71 | * All state transitions are protected by cpu_base->lock. |
| 72 | */ |
| 73 | #define HRTIMER_STATE_INACTIVE 0x00 |
| 74 | #define HRTIMER_STATE_ENQUEUED 0x01 |
Thomas Gleixner | 303e967 | 2007-02-16 01:27:51 -0800 | [diff] [blame] | 75 | |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 76 | /** |
| 77 | * struct hrtimer - the basic hrtimer structure |
John Stultz | 998adc3 | 2010-09-20 19:19:17 -0700 | [diff] [blame] | 78 | * @node: timerqueue node, which also manages node.expires, |
| 79 | * the absolute expiry time in the hrtimers internal |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 80 | * representation. The time is related to the clock on |
Thomas Gleixner | 592aa99 | 2008-10-20 16:38:19 +0200 | [diff] [blame] | 81 | * which the timer is based. Is setup by adding |
| 82 | * slack to the _softexpires value. For non range timers |
| 83 | * identical to _softexpires. |
| 84 | * @_softexpires: the absolute earliest expiry time of the hrtimer. |
| 85 | * The time which was given as expiry time when the timer |
| 86 | * was armed. |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 87 | * @function: timer expiry callback function |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 88 | * @base: pointer to the timer base (per cpu and per clock) |
Thomas Gleixner | 303e967 | 2007-02-16 01:27:51 -0800 | [diff] [blame] | 89 | * @state: state information (See bit values above) |
Thomas Gleixner | 203cbf7 | 2016-01-14 16:54:46 +0000 | [diff] [blame] | 90 | * @is_rel: Set if the timer was armed relative |
| 91 | * @start_pid: timer statistics field to store the pid of the task which |
Viresh Kumar | e2e680f | 2014-03-19 16:21:33 +0530 | [diff] [blame] | 92 | * started the timer |
Thomas Gleixner | 54cdfdb | 2007-02-16 01:28:11 -0800 | [diff] [blame] | 93 | * @start_site: timer statistics field to store the site where the timer |
| 94 | * was started |
| 95 | * @start_comm: timer statistics field to store the name of the process which |
| 96 | * started the timer |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 97 | * |
Thomas Gleixner | 54cdfdb | 2007-02-16 01:28:11 -0800 | [diff] [blame] | 98 | * The hrtimer structure must be initialized by hrtimer_init() |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 99 | */ |
| 100 | struct hrtimer { |
John Stultz | 998adc3 | 2010-09-20 19:19:17 -0700 | [diff] [blame] | 101 | struct timerqueue_node node; |
Arjan van de Ven | 654c8e0 | 2008-09-01 15:47:08 -0700 | [diff] [blame] | 102 | ktime_t _softexpires; |
Thomas Gleixner | 3c8aa39 | 2007-02-16 01:27:50 -0800 | [diff] [blame] | 103 | enum hrtimer_restart (*function)(struct hrtimer *); |
| 104 | struct hrtimer_clock_base *base; |
Thomas Gleixner | 203cbf7 | 2016-01-14 16:54:46 +0000 | [diff] [blame] | 105 | u8 state; |
| 106 | u8 is_rel; |
Ingo Molnar | 82f67cd | 2007-02-16 01:28:13 -0800 | [diff] [blame] | 107 | #ifdef CONFIG_TIMER_STATS |
Richard Kennedy | 1b02469 | 2008-09-22 14:42:43 -0700 | [diff] [blame] | 108 | int start_pid; |
Ingo Molnar | 82f67cd | 2007-02-16 01:28:13 -0800 | [diff] [blame] | 109 | void *start_site; |
| 110 | char start_comm[16]; |
Ingo Molnar | 82f67cd | 2007-02-16 01:28:13 -0800 | [diff] [blame] | 111 | #endif |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 112 | }; |
| 113 | |
| 114 | /** |
Thomas Gleixner | 00362e3 | 2006-03-31 02:31:17 -0800 | [diff] [blame] | 115 | * struct hrtimer_sleeper - simple sleeper structure |
Thomas Gleixner | 00362e3 | 2006-03-31 02:31:17 -0800 | [diff] [blame] | 116 | * @timer: embedded timer structure |
| 117 | * @task: task to wake up |
| 118 | * |
| 119 | * task is set to NULL, when the timer expires. |
| 120 | */ |
| 121 | struct hrtimer_sleeper { |
| 122 | struct hrtimer timer; |
| 123 | struct task_struct *task; |
| 124 | }; |
| 125 | |
Thomas Gleixner | b8e3841 | 2015-04-14 21:08:44 +0000 | [diff] [blame] | 126 | #ifdef CONFIG_64BIT |
| 127 | # define HRTIMER_CLOCK_BASE_ALIGN 64 |
| 128 | #else |
| 129 | # define HRTIMER_CLOCK_BASE_ALIGN 32 |
| 130 | #endif |
| 131 | |
Thomas Gleixner | 00362e3 | 2006-03-31 02:31:17 -0800 | [diff] [blame] | 132 | /** |
Andres Salomon | d1d6717 | 2007-03-06 01:42:07 -0800 | [diff] [blame] | 133 | * struct hrtimer_clock_base - the timer base for a specific clock |
Randy Dunlap | 05fb6bf | 2007-02-28 20:12:13 -0800 | [diff] [blame] | 134 | * @cpu_base: per cpu clock base |
Thomas Gleixner | 3c8aa39 | 2007-02-16 01:27:50 -0800 | [diff] [blame] | 135 | * @index: clock type index for per_cpu support when moving a |
| 136 | * timer to a base on another cpu. |
Vitaliy Ivanov | 4d258b2 | 2011-06-27 19:07:08 +0300 | [diff] [blame] | 137 | * @clockid: clock id for per_cpu support |
Thomas Gleixner | 92127c7 | 2006-03-26 01:38:05 -0800 | [diff] [blame] | 138 | * @active: red black tree root node for the active timers |
Thomas Gleixner | 92127c7 | 2006-03-26 01:38:05 -0800 | [diff] [blame] | 139 | * @get_time: function to retrieve the current time of the clock |
Thomas Gleixner | 54cdfdb | 2007-02-16 01:28:11 -0800 | [diff] [blame] | 140 | * @offset: offset of this clock to the monotonic base |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 141 | */ |
Thomas Gleixner | 3c8aa39 | 2007-02-16 01:27:50 -0800 | [diff] [blame] | 142 | struct hrtimer_clock_base { |
| 143 | struct hrtimer_cpu_base *cpu_base; |
Thomas Gleixner | ab8177b | 2011-05-20 13:05:15 +0200 | [diff] [blame] | 144 | int index; |
| 145 | clockid_t clockid; |
John Stultz | 998adc3 | 2010-09-20 19:19:17 -0700 | [diff] [blame] | 146 | struct timerqueue_head active; |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 147 | ktime_t (*get_time)(void); |
Thomas Gleixner | 54cdfdb | 2007-02-16 01:28:11 -0800 | [diff] [blame] | 148 | ktime_t offset; |
Thomas Gleixner | b8e3841 | 2015-04-14 21:08:44 +0000 | [diff] [blame] | 149 | } __attribute__((__aligned__(HRTIMER_CLOCK_BASE_ALIGN))); |
Thomas Gleixner | 3c8aa39 | 2007-02-16 01:27:50 -0800 | [diff] [blame] | 150 | |
John Stultz | e06383d | 2010-12-14 19:37:07 -0800 | [diff] [blame] | 151 | enum hrtimer_base_type { |
John Stultz | e06383d | 2010-12-14 19:37:07 -0800 | [diff] [blame] | 152 | HRTIMER_BASE_MONOTONIC, |
Thomas Gleixner | 68fa61c | 2011-05-20 23:14:04 +0200 | [diff] [blame] | 153 | HRTIMER_BASE_REALTIME, |
John Stultz | 70a08cc | 2011-02-15 10:45:16 -0800 | [diff] [blame] | 154 | HRTIMER_BASE_BOOTTIME, |
John Stultz | 90adda9 | 2013-01-21 17:00:11 -0800 | [diff] [blame] | 155 | HRTIMER_BASE_TAI, |
John Stultz | e06383d | 2010-12-14 19:37:07 -0800 | [diff] [blame] | 156 | HRTIMER_MAX_CLOCK_BASES, |
| 157 | }; |
Thomas Gleixner | 3c8aa39 | 2007-02-16 01:27:50 -0800 | [diff] [blame] | 158 | |
| 159 | /* |
| 160 | * struct hrtimer_cpu_base - the per cpu clock bases |
| 161 | * @lock: lock protecting the base and associated clock bases |
| 162 | * and timers |
Peter Zijlstra | 887d9dc | 2015-06-11 14:46:48 +0200 | [diff] [blame] | 163 | * @seq: seqcount around __run_hrtimer |
| 164 | * @running: pointer to the currently running hrtimer |
Viresh Kumar | cddd024 | 2014-06-22 01:29:15 +0200 | [diff] [blame] | 165 | * @cpu: cpu number |
Thomas Gleixner | ab8177b | 2011-05-20 13:05:15 +0200 | [diff] [blame] | 166 | * @active_bases: Bitfield to mark bases with active timers |
Thomas Gleixner | 868a3e9 | 2015-04-14 21:08:37 +0000 | [diff] [blame] | 167 | * @clock_was_set_seq: Sequence counter of clock was set events |
Thomas Gleixner | bc7a34b | 2015-05-26 22:50:33 +0000 | [diff] [blame] | 168 | * @migration_enabled: The migration of hrtimers to other cpus is enabled |
Thomas Gleixner | 683be13 | 2015-05-26 22:50:35 +0000 | [diff] [blame] | 169 | * @nohz_active: The nohz functionality is enabled |
Thomas Gleixner | 54cdfdb | 2007-02-16 01:28:11 -0800 | [diff] [blame] | 170 | * @expires_next: absolute time of the next event which was scheduled |
| 171 | * via clock_set_next_event() |
Thomas Gleixner | 895bdfa | 2015-04-14 21:08:49 +0000 | [diff] [blame] | 172 | * @next_timer: Pointer to the first expiring timer |
Thomas Gleixner | 9bc74919 | 2015-01-20 21:24:10 +0100 | [diff] [blame] | 173 | * @in_hrtirq: hrtimer_interrupt() is currently executing |
Thomas Gleixner | 54cdfdb | 2007-02-16 01:28:11 -0800 | [diff] [blame] | 174 | * @hres_active: State of high resolution mode |
Thomas Gleixner | 41d2e49 | 2009-11-13 17:05:44 +0100 | [diff] [blame] | 175 | * @hang_detected: The last hrtimer interrupt detected a hang |
| 176 | * @nr_events: Total number of hrtimer interrupt events |
| 177 | * @nr_retries: Total number of hrtimer interrupt retries |
| 178 | * @nr_hangs: Total number of hrtimer interrupt hangs |
| 179 | * @max_hang_time: Maximum time spent in hrtimer_interrupt |
Thomas Gleixner | ab8177b | 2011-05-20 13:05:15 +0200 | [diff] [blame] | 180 | * @clock_base: array of clock bases for this cpu |
Thomas Gleixner | 895bdfa | 2015-04-14 21:08:49 +0000 | [diff] [blame] | 181 | * |
| 182 | * Note: next_timer is just an optimization for __remove_hrtimer(). |
| 183 | * Do not dereference the pointer because it is not reliable on |
| 184 | * cross cpu removals. |
Thomas Gleixner | 3c8aa39 | 2007-02-16 01:27:50 -0800 | [diff] [blame] | 185 | */ |
| 186 | struct hrtimer_cpu_base { |
Thomas Gleixner | ecb49d1 | 2009-11-17 16:36:54 +0100 | [diff] [blame] | 187 | raw_spinlock_t lock; |
Peter Zijlstra | 887d9dc | 2015-06-11 14:46:48 +0200 | [diff] [blame] | 188 | seqcount_t seq; |
| 189 | struct hrtimer *running; |
Viresh Kumar | cddd024 | 2014-06-22 01:29:15 +0200 | [diff] [blame] | 190 | unsigned int cpu; |
John Stultz | f55a6fa | 2012-07-10 18:43:19 -0400 | [diff] [blame] | 191 | unsigned int active_bases; |
Thomas Gleixner | 868a3e9 | 2015-04-14 21:08:37 +0000 | [diff] [blame] | 192 | unsigned int clock_was_set_seq; |
Thomas Gleixner | bc7a34b | 2015-05-26 22:50:33 +0000 | [diff] [blame] | 193 | bool migration_enabled; |
Thomas Gleixner | 683be13 | 2015-05-26 22:50:35 +0000 | [diff] [blame] | 194 | bool nohz_active; |
Thomas Gleixner | 54cdfdb | 2007-02-16 01:28:11 -0800 | [diff] [blame] | 195 | #ifdef CONFIG_HIGH_RES_TIMERS |
Thomas Gleixner | e19ffe8 | 2015-04-14 21:08:39 +0000 | [diff] [blame] | 196 | unsigned int in_hrtirq : 1, |
| 197 | hres_active : 1, |
| 198 | hang_detected : 1; |
Thomas Gleixner | 54cdfdb | 2007-02-16 01:28:11 -0800 | [diff] [blame] | 199 | ktime_t expires_next; |
Thomas Gleixner | 895bdfa | 2015-04-14 21:08:49 +0000 | [diff] [blame] | 200 | struct hrtimer *next_timer; |
Thomas Gleixner | a6ffebc | 2015-04-14 21:08:34 +0000 | [diff] [blame] | 201 | unsigned int nr_events; |
| 202 | unsigned int nr_retries; |
| 203 | unsigned int nr_hangs; |
| 204 | unsigned int max_hang_time; |
Thomas Gleixner | 54cdfdb | 2007-02-16 01:28:11 -0800 | [diff] [blame] | 205 | #endif |
Thomas Gleixner | f24444b | 2011-05-20 13:02:58 +0200 | [diff] [blame] | 206 | struct hrtimer_clock_base clock_base[HRTIMER_MAX_CLOCK_BASES]; |
Thomas Gleixner | 6d9a141 | 2015-04-14 21:08:42 +0000 | [diff] [blame] | 207 | } ____cacheline_aligned; |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 208 | |
Arjan van de Ven | 63ca243 | 2008-09-01 14:35:02 -0700 | [diff] [blame] | 209 | static inline void hrtimer_set_expires(struct hrtimer *timer, ktime_t time) |
| 210 | { |
Thomas Gleixner | b8e3841 | 2015-04-14 21:08:44 +0000 | [diff] [blame] | 211 | BUILD_BUG_ON(sizeof(struct hrtimer_clock_base) > HRTIMER_CLOCK_BASE_ALIGN); |
| 212 | |
John Stultz | 998adc3 | 2010-09-20 19:19:17 -0700 | [diff] [blame] | 213 | timer->node.expires = time; |
Arjan van de Ven | 654c8e0 | 2008-09-01 15:47:08 -0700 | [diff] [blame] | 214 | timer->_softexpires = time; |
Arjan van de Ven | 63ca243 | 2008-09-01 14:35:02 -0700 | [diff] [blame] | 215 | } |
Arjan van de Ven | 654c8e0 | 2008-09-01 15:47:08 -0700 | [diff] [blame] | 216 | |
| 217 | static inline void hrtimer_set_expires_range(struct hrtimer *timer, ktime_t time, ktime_t delta) |
| 218 | { |
| 219 | timer->_softexpires = time; |
John Stultz | 998adc3 | 2010-09-20 19:19:17 -0700 | [diff] [blame] | 220 | timer->node.expires = ktime_add_safe(time, delta); |
Arjan van de Ven | 654c8e0 | 2008-09-01 15:47:08 -0700 | [diff] [blame] | 221 | } |
| 222 | |
John Stultz | da8b44d | 2016-03-17 14:20:51 -0700 | [diff] [blame] | 223 | static inline void hrtimer_set_expires_range_ns(struct hrtimer *timer, ktime_t time, u64 delta) |
Arjan van de Ven | 654c8e0 | 2008-09-01 15:47:08 -0700 | [diff] [blame] | 224 | { |
| 225 | timer->_softexpires = time; |
John Stultz | 998adc3 | 2010-09-20 19:19:17 -0700 | [diff] [blame] | 226 | timer->node.expires = ktime_add_safe(time, ns_to_ktime(delta)); |
Arjan van de Ven | 654c8e0 | 2008-09-01 15:47:08 -0700 | [diff] [blame] | 227 | } |
| 228 | |
Arjan van de Ven | 63ca243 | 2008-09-01 14:35:02 -0700 | [diff] [blame] | 229 | static inline void hrtimer_set_expires_tv64(struct hrtimer *timer, s64 tv64) |
| 230 | { |
John Stultz | 998adc3 | 2010-09-20 19:19:17 -0700 | [diff] [blame] | 231 | timer->node.expires.tv64 = tv64; |
Arjan van de Ven | 654c8e0 | 2008-09-01 15:47:08 -0700 | [diff] [blame] | 232 | timer->_softexpires.tv64 = tv64; |
Arjan van de Ven | 63ca243 | 2008-09-01 14:35:02 -0700 | [diff] [blame] | 233 | } |
| 234 | |
| 235 | static inline void hrtimer_add_expires(struct hrtimer *timer, ktime_t time) |
| 236 | { |
John Stultz | 998adc3 | 2010-09-20 19:19:17 -0700 | [diff] [blame] | 237 | timer->node.expires = ktime_add_safe(timer->node.expires, time); |
Arjan van de Ven | 654c8e0 | 2008-09-01 15:47:08 -0700 | [diff] [blame] | 238 | timer->_softexpires = ktime_add_safe(timer->_softexpires, time); |
Arjan van de Ven | 63ca243 | 2008-09-01 14:35:02 -0700 | [diff] [blame] | 239 | } |
| 240 | |
David Howells | 7597bc9 | 2008-11-05 17:38:47 +0000 | [diff] [blame] | 241 | static inline void hrtimer_add_expires_ns(struct hrtimer *timer, u64 ns) |
Arjan van de Ven | 63ca243 | 2008-09-01 14:35:02 -0700 | [diff] [blame] | 242 | { |
John Stultz | 998adc3 | 2010-09-20 19:19:17 -0700 | [diff] [blame] | 243 | timer->node.expires = ktime_add_ns(timer->node.expires, ns); |
Arjan van de Ven | 654c8e0 | 2008-09-01 15:47:08 -0700 | [diff] [blame] | 244 | timer->_softexpires = ktime_add_ns(timer->_softexpires, ns); |
Arjan van de Ven | 63ca243 | 2008-09-01 14:35:02 -0700 | [diff] [blame] | 245 | } |
| 246 | |
| 247 | static inline ktime_t hrtimer_get_expires(const struct hrtimer *timer) |
| 248 | { |
John Stultz | 998adc3 | 2010-09-20 19:19:17 -0700 | [diff] [blame] | 249 | return timer->node.expires; |
Arjan van de Ven | 63ca243 | 2008-09-01 14:35:02 -0700 | [diff] [blame] | 250 | } |
| 251 | |
Arjan van de Ven | 654c8e0 | 2008-09-01 15:47:08 -0700 | [diff] [blame] | 252 | static inline ktime_t hrtimer_get_softexpires(const struct hrtimer *timer) |
| 253 | { |
| 254 | return timer->_softexpires; |
| 255 | } |
| 256 | |
Arjan van de Ven | 63ca243 | 2008-09-01 14:35:02 -0700 | [diff] [blame] | 257 | static inline s64 hrtimer_get_expires_tv64(const struct hrtimer *timer) |
| 258 | { |
John Stultz | 998adc3 | 2010-09-20 19:19:17 -0700 | [diff] [blame] | 259 | return timer->node.expires.tv64; |
Arjan van de Ven | 63ca243 | 2008-09-01 14:35:02 -0700 | [diff] [blame] | 260 | } |
Arjan van de Ven | 654c8e0 | 2008-09-01 15:47:08 -0700 | [diff] [blame] | 261 | static inline s64 hrtimer_get_softexpires_tv64(const struct hrtimer *timer) |
| 262 | { |
| 263 | return timer->_softexpires.tv64; |
| 264 | } |
Arjan van de Ven | 63ca243 | 2008-09-01 14:35:02 -0700 | [diff] [blame] | 265 | |
| 266 | static inline s64 hrtimer_get_expires_ns(const struct hrtimer *timer) |
| 267 | { |
John Stultz | 998adc3 | 2010-09-20 19:19:17 -0700 | [diff] [blame] | 268 | return ktime_to_ns(timer->node.expires); |
Arjan van de Ven | 63ca243 | 2008-09-01 14:35:02 -0700 | [diff] [blame] | 269 | } |
| 270 | |
| 271 | static inline ktime_t hrtimer_expires_remaining(const struct hrtimer *timer) |
| 272 | { |
John Stultz | 998adc3 | 2010-09-20 19:19:17 -0700 | [diff] [blame] | 273 | return ktime_sub(timer->node.expires, timer->base->get_time()); |
Arjan van de Ven | 63ca243 | 2008-09-01 14:35:02 -0700 | [diff] [blame] | 274 | } |
| 275 | |
Thomas Gleixner | 54cdfdb | 2007-02-16 01:28:11 -0800 | [diff] [blame] | 276 | static inline ktime_t hrtimer_cb_get_time(struct hrtimer *timer) |
| 277 | { |
| 278 | return timer->base->get_time(); |
| 279 | } |
| 280 | |
Thomas Gleixner | 21d6d52 | 2015-04-14 21:08:35 +0000 | [diff] [blame] | 281 | #ifdef CONFIG_HIGH_RES_TIMERS |
| 282 | struct clock_event_device; |
| 283 | |
| 284 | extern void hrtimer_interrupt(struct clock_event_device *dev); |
| 285 | |
Peter Zijlstra | 8f4d37e | 2008-01-25 21:08:29 +0100 | [diff] [blame] | 286 | static inline int hrtimer_is_hres_active(struct hrtimer *timer) |
| 287 | { |
| 288 | return timer->base->cpu_base->hres_active; |
| 289 | } |
| 290 | |
Arjan van de Ven | 2075eb8 | 2008-10-07 10:57:54 -0700 | [diff] [blame] | 291 | extern void hrtimer_peek_ahead_timers(void); |
| 292 | |
Thomas Gleixner | 54cdfdb | 2007-02-16 01:28:11 -0800 | [diff] [blame] | 293 | /* |
| 294 | * The resolution of the clocks. The resolution value is returned in |
| 295 | * the clock_getres() system call to give application programmers an |
| 296 | * idea of the (in)accuracy of timers. Timer values are rounded up to |
| 297 | * this resolution values. |
| 298 | */ |
Tony Breeds | 151db1f | 2008-02-08 09:24:52 +1100 | [diff] [blame] | 299 | # define HIGH_RES_NSEC 1 |
| 300 | # define KTIME_HIGH_RES (ktime_t) { .tv64 = HIGH_RES_NSEC } |
| 301 | # define MONOTONIC_RES_NSEC HIGH_RES_NSEC |
Thomas Gleixner | 54cdfdb | 2007-02-16 01:28:11 -0800 | [diff] [blame] | 302 | # define KTIME_MONOTONIC_RES KTIME_HIGH_RES |
| 303 | |
John Stultz | f55a6fa | 2012-07-10 18:43:19 -0400 | [diff] [blame] | 304 | extern void clock_was_set_delayed(void); |
| 305 | |
Thomas Gleixner | 398ca17 | 2015-04-14 21:08:27 +0000 | [diff] [blame] | 306 | extern unsigned int hrtimer_resolution; |
| 307 | |
Thomas Gleixner | 54cdfdb | 2007-02-16 01:28:11 -0800 | [diff] [blame] | 308 | #else |
| 309 | |
Tony Breeds | 151db1f | 2008-02-08 09:24:52 +1100 | [diff] [blame] | 310 | # define MONOTONIC_RES_NSEC LOW_RES_NSEC |
Thomas Gleixner | 54cdfdb | 2007-02-16 01:28:11 -0800 | [diff] [blame] | 311 | # define KTIME_MONOTONIC_RES KTIME_LOW_RES |
| 312 | |
Borislav Petkov | d711b8b | 2015-06-06 11:30:00 +0200 | [diff] [blame] | 313 | #define hrtimer_resolution (unsigned int)LOW_RES_NSEC |
Thomas Gleixner | 398ca17 | 2015-04-14 21:08:27 +0000 | [diff] [blame] | 314 | |
Arjan van de Ven | 2075eb8 | 2008-10-07 10:57:54 -0700 | [diff] [blame] | 315 | static inline void hrtimer_peek_ahead_timers(void) { } |
Thomas Gleixner | 54cdfdb | 2007-02-16 01:28:11 -0800 | [diff] [blame] | 316 | |
Peter Zijlstra | 8f4d37e | 2008-01-25 21:08:29 +0100 | [diff] [blame] | 317 | static inline int hrtimer_is_hres_active(struct hrtimer *timer) |
| 318 | { |
| 319 | return 0; |
| 320 | } |
John Stultz | f55a6fa | 2012-07-10 18:43:19 -0400 | [diff] [blame] | 321 | |
| 322 | static inline void clock_was_set_delayed(void) { } |
| 323 | |
Thomas Gleixner | 54cdfdb | 2007-02-16 01:28:11 -0800 | [diff] [blame] | 324 | #endif |
| 325 | |
Thomas Gleixner | 203cbf7 | 2016-01-14 16:54:46 +0000 | [diff] [blame] | 326 | static inline ktime_t |
| 327 | __hrtimer_expires_remaining_adjusted(const struct hrtimer *timer, ktime_t now) |
| 328 | { |
| 329 | ktime_t rem = ktime_sub(timer->node.expires, now); |
| 330 | |
| 331 | /* |
| 332 | * Adjust relative timers for the extra we added in |
| 333 | * hrtimer_start_range_ns() to prevent short timeouts. |
| 334 | */ |
| 335 | if (IS_ENABLED(CONFIG_TIME_LOW_RES) && timer->is_rel) |
| 336 | rem.tv64 -= hrtimer_resolution; |
| 337 | return rem; |
| 338 | } |
| 339 | |
| 340 | static inline ktime_t |
| 341 | hrtimer_expires_remaining_adjusted(const struct hrtimer *timer) |
| 342 | { |
| 343 | return __hrtimer_expires_remaining_adjusted(timer, |
| 344 | timer->base->get_time()); |
| 345 | } |
| 346 | |
Thomas Gleixner | b12a03c | 2011-05-02 16:48:57 +0200 | [diff] [blame] | 347 | extern void clock_was_set(void); |
Thomas Gleixner | 9ec2690 | 2011-05-20 16:18:50 +0200 | [diff] [blame] | 348 | #ifdef CONFIG_TIMERFD |
| 349 | extern void timerfd_clock_was_set(void); |
| 350 | #else |
| 351 | static inline void timerfd_clock_was_set(void) { } |
| 352 | #endif |
Thomas Gleixner | b12a03c | 2011-05-02 16:48:57 +0200 | [diff] [blame] | 353 | extern void hrtimers_resume(void); |
| 354 | |
Arjan van de Ven | 2e94d1f | 2008-09-10 16:06:00 -0700 | [diff] [blame] | 355 | DECLARE_PER_CPU(struct tick_device, tick_cpu_device); |
Arjan van de Ven | 2e94d1f | 2008-09-10 16:06:00 -0700 | [diff] [blame] | 356 | |
| 357 | |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 358 | /* Exported timer functions: */ |
| 359 | |
| 360 | /* Initialize timers: */ |
George Anzinger | 7978672c | 2006-02-01 03:05:11 -0800 | [diff] [blame] | 361 | extern void hrtimer_init(struct hrtimer *timer, clockid_t which_clock, |
| 362 | enum hrtimer_mode mode); |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 363 | |
Thomas Gleixner | 237fc6e | 2008-04-30 00:55:04 -0700 | [diff] [blame] | 364 | #ifdef CONFIG_DEBUG_OBJECTS_TIMERS |
| 365 | extern void hrtimer_init_on_stack(struct hrtimer *timer, clockid_t which_clock, |
| 366 | enum hrtimer_mode mode); |
| 367 | |
| 368 | extern void destroy_hrtimer_on_stack(struct hrtimer *timer); |
| 369 | #else |
| 370 | static inline void hrtimer_init_on_stack(struct hrtimer *timer, |
| 371 | clockid_t which_clock, |
| 372 | enum hrtimer_mode mode) |
| 373 | { |
| 374 | hrtimer_init(timer, which_clock, mode); |
| 375 | } |
| 376 | static inline void destroy_hrtimer_on_stack(struct hrtimer *timer) { } |
| 377 | #endif |
| 378 | |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 379 | /* Basic timer operations: */ |
Thomas Gleixner | 61699e13 | 2015-04-14 21:09:23 +0000 | [diff] [blame] | 380 | extern void hrtimer_start_range_ns(struct hrtimer *timer, ktime_t tim, |
John Stultz | da8b44d | 2016-03-17 14:20:51 -0700 | [diff] [blame] | 381 | u64 range_ns, const enum hrtimer_mode mode); |
Peter Zijlstra | 7f1e2ca | 2009-03-13 12:21:27 +0100 | [diff] [blame] | 382 | |
Thomas Gleixner | 02a171a | 2015-04-14 21:09:10 +0000 | [diff] [blame] | 383 | /** |
| 384 | * hrtimer_start - (re)start an hrtimer on the current CPU |
| 385 | * @timer: the timer to be added |
| 386 | * @tim: expiry time |
| 387 | * @mode: expiry mode: absolute (HRTIMER_MODE_ABS) or |
| 388 | * relative (HRTIMER_MODE_REL) |
Thomas Gleixner | 02a171a | 2015-04-14 21:09:10 +0000 | [diff] [blame] | 389 | */ |
Thomas Gleixner | 61699e13 | 2015-04-14 21:09:23 +0000 | [diff] [blame] | 390 | static inline void hrtimer_start(struct hrtimer *timer, ktime_t tim, |
| 391 | const enum hrtimer_mode mode) |
Thomas Gleixner | 02a171a | 2015-04-14 21:09:10 +0000 | [diff] [blame] | 392 | { |
Thomas Gleixner | 61699e13 | 2015-04-14 21:09:23 +0000 | [diff] [blame] | 393 | hrtimer_start_range_ns(timer, tim, 0, mode); |
Thomas Gleixner | 02a171a | 2015-04-14 21:09:10 +0000 | [diff] [blame] | 394 | } |
| 395 | |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 396 | extern int hrtimer_cancel(struct hrtimer *timer); |
| 397 | extern int hrtimer_try_to_cancel(struct hrtimer *timer); |
| 398 | |
Thomas Gleixner | 61699e13 | 2015-04-14 21:09:23 +0000 | [diff] [blame] | 399 | static inline void hrtimer_start_expires(struct hrtimer *timer, |
| 400 | enum hrtimer_mode mode) |
Arjan van de Ven | 63ca243 | 2008-09-01 14:35:02 -0700 | [diff] [blame] | 401 | { |
John Stultz | da8b44d | 2016-03-17 14:20:51 -0700 | [diff] [blame] | 402 | u64 delta; |
Arjan van de Ven | da8f2e1 | 2008-09-07 10:47:46 -0700 | [diff] [blame] | 403 | ktime_t soft, hard; |
| 404 | soft = hrtimer_get_softexpires(timer); |
| 405 | hard = hrtimer_get_expires(timer); |
| 406 | delta = ktime_to_ns(ktime_sub(hard, soft)); |
Thomas Gleixner | 61699e13 | 2015-04-14 21:09:23 +0000 | [diff] [blame] | 407 | hrtimer_start_range_ns(timer, soft, delta, mode); |
Arjan van de Ven | 63ca243 | 2008-09-01 14:35:02 -0700 | [diff] [blame] | 408 | } |
| 409 | |
Thomas Gleixner | 61699e13 | 2015-04-14 21:09:23 +0000 | [diff] [blame] | 410 | static inline void hrtimer_restart(struct hrtimer *timer) |
Thomas Gleixner | c9cb2e3 | 2007-02-16 01:27:49 -0800 | [diff] [blame] | 411 | { |
Thomas Gleixner | 61699e13 | 2015-04-14 21:09:23 +0000 | [diff] [blame] | 412 | hrtimer_start_expires(timer, HRTIMER_MODE_ABS); |
Thomas Gleixner | c9cb2e3 | 2007-02-16 01:27:49 -0800 | [diff] [blame] | 413 | } |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 414 | |
| 415 | /* Query timers: */ |
Thomas Gleixner | 203cbf7 | 2016-01-14 16:54:46 +0000 | [diff] [blame] | 416 | extern ktime_t __hrtimer_get_remaining(const struct hrtimer *timer, bool adjust); |
| 417 | |
| 418 | static inline ktime_t hrtimer_get_remaining(const struct hrtimer *timer) |
| 419 | { |
| 420 | return __hrtimer_get_remaining(timer, false); |
| 421 | } |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 422 | |
Thomas Gleixner | c1ad348 | 2015-04-14 21:08:58 +0000 | [diff] [blame] | 423 | extern u64 hrtimer_get_next_event(void); |
Tony Lindgren | 6923974 | 2006-03-06 15:42:45 -0800 | [diff] [blame] | 424 | |
Peter Zijlstra | 887d9dc | 2015-06-11 14:46:48 +0200 | [diff] [blame] | 425 | extern bool hrtimer_active(const struct hrtimer *timer); |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 426 | |
Thomas Gleixner | 54cdfdb | 2007-02-16 01:28:11 -0800 | [diff] [blame] | 427 | /* |
| 428 | * Helper function to check, whether the timer is on one of the queues |
| 429 | */ |
| 430 | static inline int hrtimer_is_queued(struct hrtimer *timer) |
| 431 | { |
Peter Zijlstra | ca10949 | 2008-11-25 12:43:51 +0100 | [diff] [blame] | 432 | return timer->state & HRTIMER_STATE_ENQUEUED; |
Thomas Gleixner | 54cdfdb | 2007-02-16 01:28:11 -0800 | [diff] [blame] | 433 | } |
| 434 | |
Oliver Hartkopp | 4346f65 | 2008-04-30 23:04:37 +0200 | [diff] [blame] | 435 | /* |
| 436 | * Helper function to check, whether the timer is running the callback |
| 437 | * function |
| 438 | */ |
| 439 | static inline int hrtimer_callback_running(struct hrtimer *timer) |
| 440 | { |
Peter Zijlstra | 887d9dc | 2015-06-11 14:46:48 +0200 | [diff] [blame] | 441 | return timer->base->cpu_base->running == timer; |
Oliver Hartkopp | 4346f65 | 2008-04-30 23:04:37 +0200 | [diff] [blame] | 442 | } |
| 443 | |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 444 | /* Forward a hrtimer so it expires after now: */ |
Davide Libenzi | 4d672e7 | 2008-02-04 22:27:26 -0800 | [diff] [blame] | 445 | extern u64 |
Roman Zippel | 44f2147 | 2006-03-26 01:38:06 -0800 | [diff] [blame] | 446 | hrtimer_forward(struct hrtimer *timer, ktime_t now, ktime_t interval); |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 447 | |
Thomas Gleixner | 91e5a217 | 2015-04-13 21:02:22 +0000 | [diff] [blame] | 448 | /** |
| 449 | * hrtimer_forward_now - forward the timer expiry so it expires after now |
| 450 | * @timer: hrtimer to forward |
| 451 | * @interval: the interval to forward |
| 452 | * |
| 453 | * Forward the timer expiry so it will expire after the current time |
| 454 | * of the hrtimer clock base. Returns the number of overruns. |
| 455 | * |
| 456 | * Can be safely called from the callback function of @timer. If |
| 457 | * called from other contexts @timer must neither be enqueued nor |
| 458 | * running the callback and the caller needs to take care of |
| 459 | * serialization. |
| 460 | * |
| 461 | * Note: This only updates the timer expiry value and does not requeue |
| 462 | * the timer. |
| 463 | */ |
Davide Libenzi | 4d672e7 | 2008-02-04 22:27:26 -0800 | [diff] [blame] | 464 | static inline u64 hrtimer_forward_now(struct hrtimer *timer, |
| 465 | ktime_t interval) |
Davide Libenzi | 5e05ad7 | 2008-02-04 22:27:25 -0800 | [diff] [blame] | 466 | { |
| 467 | return hrtimer_forward(timer, timer->base->get_time(), interval); |
| 468 | } |
| 469 | |
Thomas Gleixner | 10c94ec | 2006-01-09 20:52:35 -0800 | [diff] [blame] | 470 | /* Precise sleep: */ |
| 471 | extern long hrtimer_nanosleep(struct timespec *rqtp, |
Oleg Nesterov | 080344b | 2008-02-01 17:29:05 +0300 | [diff] [blame] | 472 | struct timespec __user *rmtp, |
Thomas Gleixner | 10c94ec | 2006-01-09 20:52:35 -0800 | [diff] [blame] | 473 | const enum hrtimer_mode mode, |
| 474 | const clockid_t clockid); |
Toyo Abe | 1711ef3 | 2006-09-29 02:00:28 -0700 | [diff] [blame] | 475 | extern long hrtimer_nanosleep_restart(struct restart_block *restart_block); |
Thomas Gleixner | 10c94ec | 2006-01-09 20:52:35 -0800 | [diff] [blame] | 476 | |
Thomas Gleixner | 00362e3 | 2006-03-31 02:31:17 -0800 | [diff] [blame] | 477 | extern void hrtimer_init_sleeper(struct hrtimer_sleeper *sl, |
| 478 | struct task_struct *tsk); |
| 479 | |
John Stultz | da8b44d | 2016-03-17 14:20:51 -0700 | [diff] [blame] | 480 | extern int schedule_hrtimeout_range(ktime_t *expires, u64 delta, |
Arjan van de Ven | 654c8e0 | 2008-09-01 15:47:08 -0700 | [diff] [blame] | 481 | const enum hrtimer_mode mode); |
Carsten Emde | 351b3f7 | 2010-04-02 22:40:19 +0200 | [diff] [blame] | 482 | extern int schedule_hrtimeout_range_clock(ktime_t *expires, |
John Stultz | da8b44d | 2016-03-17 14:20:51 -0700 | [diff] [blame] | 483 | u64 delta, |
| 484 | const enum hrtimer_mode mode, |
| 485 | int clock); |
Arjan van de Ven | 7bb6743 | 2008-08-31 08:05:58 -0700 | [diff] [blame] | 486 | extern int schedule_hrtimeout(ktime_t *expires, const enum hrtimer_mode mode); |
| 487 | |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 488 | /* Soft interrupt function to run the hrtimer queues: */ |
| 489 | extern void hrtimer_run_queues(void); |
| 490 | |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 491 | /* Bootup initialization: */ |
| 492 | extern void __init hrtimers_init(void); |
| 493 | |
Ingo Molnar | 88ad0bf6 | 2007-02-16 01:28:16 -0800 | [diff] [blame] | 494 | /* Show pending timers: */ |
| 495 | extern void sysrq_timer_list_show(void); |
| 496 | |
Thomas Gleixner | 27590dc | 2016-07-15 10:41:04 +0200 | [diff] [blame] | 497 | int hrtimers_prepare_cpu(unsigned int cpu); |
| 498 | #ifdef CONFIG_HOTPLUG_CPU |
| 499 | int hrtimers_dead_cpu(unsigned int cpu); |
| 500 | #else |
| 501 | #define hrtimers_dead_cpu NULL |
| 502 | #endif |
| 503 | |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 504 | #endif |