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> |
| 23 | |
Thomas Gleixner | 3c8aa39 | 2007-02-16 01:27:50 -0800 | [diff] [blame] | 24 | struct hrtimer_clock_base; |
| 25 | struct hrtimer_cpu_base; |
| 26 | |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 27 | /* |
| 28 | * Mode arguments of xxx_hrtimer functions: |
| 29 | */ |
| 30 | enum hrtimer_mode { |
Thomas Gleixner | c9cb2e3 | 2007-02-16 01:27:49 -0800 | [diff] [blame] | 31 | HRTIMER_MODE_ABS, /* Time value is absolute */ |
| 32 | HRTIMER_MODE_REL, /* Time value is relative to now */ |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 33 | }; |
| 34 | |
Thomas Gleixner | c9cb2e3 | 2007-02-16 01:27:49 -0800 | [diff] [blame] | 35 | /* |
| 36 | * Return values for the callback function |
| 37 | */ |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 38 | enum hrtimer_restart { |
Thomas Gleixner | c9cb2e3 | 2007-02-16 01:27:49 -0800 | [diff] [blame] | 39 | HRTIMER_NORESTART, /* Timer is not restarted */ |
| 40 | HRTIMER_RESTART, /* Timer must be restarted */ |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 41 | }; |
| 42 | |
Thomas Gleixner | 303e967 | 2007-02-16 01:27:51 -0800 | [diff] [blame] | 43 | /* |
Thomas Gleixner | 54cdfdb | 2007-02-16 01:28:11 -0800 | [diff] [blame] | 44 | * hrtimer callback modes: |
| 45 | * |
| 46 | * HRTIMER_CB_SOFTIRQ: Callback must run in softirq context |
| 47 | * HRTIMER_CB_IRQSAFE: Callback may run in hardirq context |
| 48 | * HRTIMER_CB_IRQSAFE_NO_RESTART: Callback may run in hardirq context and |
| 49 | * does not restart the timer |
Andres Salomon | 8437fdc | 2007-03-06 01:42:06 -0800 | [diff] [blame] | 50 | * HRTIMER_CB_IRQSAFE_NO_SOFTIRQ: Callback must run in hardirq context |
Thomas Gleixner | 54cdfdb | 2007-02-16 01:28:11 -0800 | [diff] [blame] | 51 | * Special mode for tick emultation |
| 52 | */ |
| 53 | enum hrtimer_cb_mode { |
| 54 | HRTIMER_CB_SOFTIRQ, |
| 55 | HRTIMER_CB_IRQSAFE, |
| 56 | HRTIMER_CB_IRQSAFE_NO_RESTART, |
| 57 | HRTIMER_CB_IRQSAFE_NO_SOFTIRQ, |
| 58 | }; |
| 59 | |
| 60 | /* |
| 61 | * Values to track state of the timer |
Thomas Gleixner | 303e967 | 2007-02-16 01:27:51 -0800 | [diff] [blame] | 62 | * |
| 63 | * Possible states: |
| 64 | * |
| 65 | * 0x00 inactive |
| 66 | * 0x01 enqueued into rbtree |
| 67 | * 0x02 callback function running |
Thomas Gleixner | 54cdfdb | 2007-02-16 01:28:11 -0800 | [diff] [blame] | 68 | * 0x04 callback pending (high resolution mode) |
| 69 | * |
| 70 | * Special case: |
Thomas Gleixner | 303e967 | 2007-02-16 01:27:51 -0800 | [diff] [blame] | 71 | * 0x03 callback function running and enqueued |
| 72 | * (was requeued on another CPU) |
Thomas Gleixner | 303e967 | 2007-02-16 01:27:51 -0800 | [diff] [blame] | 73 | * The "callback function running and enqueued" status is only possible on |
| 74 | * SMP. It happens for example when a posix timer expired and the callback |
| 75 | * queued a signal. Between dropping the lock which protects the posix timer |
| 76 | * and reacquiring the base lock of the hrtimer, another CPU can deliver the |
| 77 | * signal and rearm the timer. We have to preserve the callback running state, |
| 78 | * as otherwise the timer could be removed before the softirq code finishes the |
| 79 | * the handling of the timer. |
| 80 | * |
Li Zefan | 3eb0567 | 2008-02-08 04:19:25 -0800 | [diff] [blame] | 81 | * The HRTIMER_STATE_ENQUEUED bit is always or'ed to the current state to |
Thomas Gleixner | 303e967 | 2007-02-16 01:27:51 -0800 | [diff] [blame] | 82 | * preserve the HRTIMER_STATE_CALLBACK bit in the above scenario. |
| 83 | * |
| 84 | * All state transitions are protected by cpu_base->lock. |
| 85 | */ |
| 86 | #define HRTIMER_STATE_INACTIVE 0x00 |
| 87 | #define HRTIMER_STATE_ENQUEUED 0x01 |
| 88 | #define HRTIMER_STATE_CALLBACK 0x02 |
Thomas Gleixner | 54cdfdb | 2007-02-16 01:28:11 -0800 | [diff] [blame] | 89 | #define HRTIMER_STATE_PENDING 0x04 |
Thomas Gleixner | 303e967 | 2007-02-16 01:27:51 -0800 | [diff] [blame] | 90 | |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 91 | /** |
| 92 | * struct hrtimer - the basic hrtimer structure |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 93 | * @node: red black tree node for time ordered insertion |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 94 | * @expires: the absolute expiry time in the hrtimers internal |
| 95 | * representation. The time is related to the clock on |
| 96 | * which the timer is based. |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 97 | * @function: timer expiry callback function |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 98 | * @base: pointer to the timer base (per cpu and per clock) |
Thomas Gleixner | 303e967 | 2007-02-16 01:27:51 -0800 | [diff] [blame] | 99 | * @state: state information (See bit values above) |
Thomas Gleixner | 54cdfdb | 2007-02-16 01:28:11 -0800 | [diff] [blame] | 100 | * @cb_mode: high resolution timer feature to select the callback execution |
| 101 | * mode |
| 102 | * @cb_entry: list head to enqueue an expired timer into the callback list |
| 103 | * @start_site: timer statistics field to store the site where the timer |
| 104 | * was started |
| 105 | * @start_comm: timer statistics field to store the name of the process which |
| 106 | * started the timer |
| 107 | * @start_pid: timer statistics field to store the pid of the task which |
| 108 | * started the timer |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 109 | * |
Thomas Gleixner | 54cdfdb | 2007-02-16 01:28:11 -0800 | [diff] [blame] | 110 | * The hrtimer structure must be initialized by hrtimer_init() |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 111 | */ |
| 112 | struct hrtimer { |
Thomas Gleixner | 3c8aa39 | 2007-02-16 01:27:50 -0800 | [diff] [blame] | 113 | struct rb_node node; |
| 114 | ktime_t expires; |
| 115 | enum hrtimer_restart (*function)(struct hrtimer *); |
| 116 | struct hrtimer_clock_base *base; |
Thomas Gleixner | 303e967 | 2007-02-16 01:27:51 -0800 | [diff] [blame] | 117 | unsigned long state; |
Thomas Gleixner | 54cdfdb | 2007-02-16 01:28:11 -0800 | [diff] [blame] | 118 | enum hrtimer_cb_mode cb_mode; |
| 119 | struct list_head cb_entry; |
Ingo Molnar | 82f67cd | 2007-02-16 01:28:13 -0800 | [diff] [blame] | 120 | #ifdef CONFIG_TIMER_STATS |
| 121 | void *start_site; |
| 122 | char start_comm[16]; |
| 123 | int start_pid; |
| 124 | #endif |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 125 | }; |
| 126 | |
| 127 | /** |
Thomas Gleixner | 00362e3 | 2006-03-31 02:31:17 -0800 | [diff] [blame] | 128 | * struct hrtimer_sleeper - simple sleeper structure |
Thomas Gleixner | 00362e3 | 2006-03-31 02:31:17 -0800 | [diff] [blame] | 129 | * @timer: embedded timer structure |
| 130 | * @task: task to wake up |
| 131 | * |
| 132 | * task is set to NULL, when the timer expires. |
| 133 | */ |
| 134 | struct hrtimer_sleeper { |
| 135 | struct hrtimer timer; |
| 136 | struct task_struct *task; |
| 137 | }; |
| 138 | |
| 139 | /** |
Andres Salomon | d1d6717 | 2007-03-06 01:42:07 -0800 | [diff] [blame] | 140 | * struct hrtimer_clock_base - the timer base for a specific clock |
Randy Dunlap | 05fb6bf | 2007-02-28 20:12:13 -0800 | [diff] [blame] | 141 | * @cpu_base: per cpu clock base |
Thomas Gleixner | 3c8aa39 | 2007-02-16 01:27:50 -0800 | [diff] [blame] | 142 | * @index: clock type index for per_cpu support when moving a |
| 143 | * timer to a base on another cpu. |
Thomas Gleixner | 92127c7 | 2006-03-26 01:38:05 -0800 | [diff] [blame] | 144 | * @active: red black tree root node for the active timers |
| 145 | * @first: pointer to the timer node which expires first |
| 146 | * @resolution: the resolution of the clock, in nanoseconds |
| 147 | * @get_time: function to retrieve the current time of the clock |
Martin Waitz | a580290 | 2006-04-02 13:59:55 +0200 | [diff] [blame] | 148 | * @get_softirq_time: function to retrieve the current time from the softirq |
Thomas Gleixner | 92127c7 | 2006-03-26 01:38:05 -0800 | [diff] [blame] | 149 | * @softirq_time: the time when running the hrtimer queue in the softirq |
Thomas Gleixner | 54cdfdb | 2007-02-16 01:28:11 -0800 | [diff] [blame] | 150 | * @offset: offset of this clock to the monotonic base |
| 151 | * @reprogram: function to reprogram the timer event |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 152 | */ |
Thomas Gleixner | 3c8aa39 | 2007-02-16 01:27:50 -0800 | [diff] [blame] | 153 | struct hrtimer_clock_base { |
| 154 | struct hrtimer_cpu_base *cpu_base; |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 155 | clockid_t index; |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 156 | struct rb_root active; |
Thomas Gleixner | 288867e | 2006-01-12 11:25:54 +0100 | [diff] [blame] | 157 | struct rb_node *first; |
Thomas Gleixner | e278763 | 2006-01-12 11:36:14 +0100 | [diff] [blame] | 158 | ktime_t resolution; |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 159 | ktime_t (*get_time)(void); |
Thomas Gleixner | 92127c7 | 2006-03-26 01:38:05 -0800 | [diff] [blame] | 160 | ktime_t (*get_softirq_time)(void); |
Thomas Gleixner | 92127c7 | 2006-03-26 01:38:05 -0800 | [diff] [blame] | 161 | ktime_t softirq_time; |
Thomas Gleixner | 54cdfdb | 2007-02-16 01:28:11 -0800 | [diff] [blame] | 162 | #ifdef CONFIG_HIGH_RES_TIMERS |
| 163 | ktime_t offset; |
| 164 | int (*reprogram)(struct hrtimer *t, |
| 165 | struct hrtimer_clock_base *b, |
| 166 | ktime_t n); |
| 167 | #endif |
Thomas Gleixner | 3c8aa39 | 2007-02-16 01:27:50 -0800 | [diff] [blame] | 168 | }; |
| 169 | |
| 170 | #define HRTIMER_MAX_CLOCK_BASES 2 |
| 171 | |
| 172 | /* |
| 173 | * struct hrtimer_cpu_base - the per cpu clock bases |
| 174 | * @lock: lock protecting the base and associated clock bases |
| 175 | * and timers |
Thomas Gleixner | 3c8aa39 | 2007-02-16 01:27:50 -0800 | [diff] [blame] | 176 | * @clock_base: array of clock bases for this cpu |
| 177 | * @curr_timer: the timer which is executing a callback right now |
Thomas Gleixner | 54cdfdb | 2007-02-16 01:28:11 -0800 | [diff] [blame] | 178 | * @expires_next: absolute time of the next event which was scheduled |
| 179 | * via clock_set_next_event() |
| 180 | * @hres_active: State of high resolution mode |
| 181 | * @check_clocks: Indictator, when set evaluate time source and clock |
| 182 | * event devices whether high resolution mode can be |
| 183 | * activated. |
| 184 | * @cb_pending: Expired timers are moved from the rbtree to this |
| 185 | * list in the timer interrupt. The list is processed |
| 186 | * in the softirq. |
| 187 | * @nr_events: Total number of timer interrupt events |
Thomas Gleixner | 3c8aa39 | 2007-02-16 01:27:50 -0800 | [diff] [blame] | 188 | */ |
| 189 | struct hrtimer_cpu_base { |
| 190 | spinlock_t lock; |
Thomas Gleixner | 3c8aa39 | 2007-02-16 01:27:50 -0800 | [diff] [blame] | 191 | struct hrtimer_clock_base clock_base[HRTIMER_MAX_CLOCK_BASES]; |
Peter Zijlstra | d3d7445 | 2008-01-25 21:08:31 +0100 | [diff] [blame] | 192 | struct list_head cb_pending; |
Thomas Gleixner | 54cdfdb | 2007-02-16 01:28:11 -0800 | [diff] [blame] | 193 | #ifdef CONFIG_HIGH_RES_TIMERS |
| 194 | ktime_t expires_next; |
| 195 | int hres_active; |
Thomas Gleixner | 54cdfdb | 2007-02-16 01:28:11 -0800 | [diff] [blame] | 196 | unsigned long nr_events; |
| 197 | #endif |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 198 | }; |
| 199 | |
Thomas Gleixner | 54cdfdb | 2007-02-16 01:28:11 -0800 | [diff] [blame] | 200 | #ifdef CONFIG_HIGH_RES_TIMERS |
| 201 | struct clock_event_device; |
| 202 | |
| 203 | extern void clock_was_set(void); |
Ingo Molnar | 995f054 | 2007-04-07 12:05:00 +0200 | [diff] [blame] | 204 | extern void hres_timers_resume(void); |
Thomas Gleixner | 54cdfdb | 2007-02-16 01:28:11 -0800 | [diff] [blame] | 205 | extern void hrtimer_interrupt(struct clock_event_device *dev); |
| 206 | |
| 207 | /* |
| 208 | * In high resolution mode the time reference must be read accurate |
| 209 | */ |
| 210 | static inline ktime_t hrtimer_cb_get_time(struct hrtimer *timer) |
| 211 | { |
| 212 | return timer->base->get_time(); |
| 213 | } |
| 214 | |
Peter Zijlstra | 8f4d37e | 2008-01-25 21:08:29 +0100 | [diff] [blame] | 215 | static inline int hrtimer_is_hres_active(struct hrtimer *timer) |
| 216 | { |
| 217 | return timer->base->cpu_base->hres_active; |
| 218 | } |
| 219 | |
Thomas Gleixner | 54cdfdb | 2007-02-16 01:28:11 -0800 | [diff] [blame] | 220 | /* |
| 221 | * The resolution of the clocks. The resolution value is returned in |
| 222 | * the clock_getres() system call to give application programmers an |
| 223 | * idea of the (in)accuracy of timers. Timer values are rounded up to |
| 224 | * this resolution values. |
| 225 | */ |
Tony Breeds | 151db1f | 2008-02-08 09:24:52 +1100 | [diff] [blame] | 226 | # define HIGH_RES_NSEC 1 |
| 227 | # define KTIME_HIGH_RES (ktime_t) { .tv64 = HIGH_RES_NSEC } |
| 228 | # define MONOTONIC_RES_NSEC HIGH_RES_NSEC |
Thomas Gleixner | 54cdfdb | 2007-02-16 01:28:11 -0800 | [diff] [blame] | 229 | # define KTIME_MONOTONIC_RES KTIME_HIGH_RES |
| 230 | |
| 231 | #else |
| 232 | |
Tony Breeds | 151db1f | 2008-02-08 09:24:52 +1100 | [diff] [blame] | 233 | # define MONOTONIC_RES_NSEC LOW_RES_NSEC |
Thomas Gleixner | 54cdfdb | 2007-02-16 01:28:11 -0800 | [diff] [blame] | 234 | # define KTIME_MONOTONIC_RES KTIME_LOW_RES |
| 235 | |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 236 | /* |
| 237 | * clock_was_set() is a NOP for non- high-resolution systems. The |
| 238 | * time-sorted order guarantees that a timer does not expire early and |
| 239 | * is expired in the next softirq when the clock was advanced. |
| 240 | */ |
Thomas Gleixner | 54cdfdb | 2007-02-16 01:28:11 -0800 | [diff] [blame] | 241 | static inline void clock_was_set(void) { } |
| 242 | |
Ingo Molnar | 995f054 | 2007-04-07 12:05:00 +0200 | [diff] [blame] | 243 | static inline void hres_timers_resume(void) { } |
| 244 | |
Thomas Gleixner | 54cdfdb | 2007-02-16 01:28:11 -0800 | [diff] [blame] | 245 | /* |
| 246 | * In non high resolution mode the time reference is taken from |
| 247 | * the base softirq time variable. |
| 248 | */ |
| 249 | static inline ktime_t hrtimer_cb_get_time(struct hrtimer *timer) |
| 250 | { |
| 251 | return timer->base->softirq_time; |
| 252 | } |
| 253 | |
Peter Zijlstra | 8f4d37e | 2008-01-25 21:08:29 +0100 | [diff] [blame] | 254 | static inline int hrtimer_is_hres_active(struct hrtimer *timer) |
| 255 | { |
| 256 | return 0; |
| 257 | } |
Thomas Gleixner | 54cdfdb | 2007-02-16 01:28:11 -0800 | [diff] [blame] | 258 | #endif |
| 259 | |
Thomas Gleixner | d316c57 | 2007-02-16 01:28:00 -0800 | [diff] [blame] | 260 | extern ktime_t ktime_get(void); |
| 261 | extern ktime_t ktime_get_real(void); |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 262 | |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 263 | /* Exported timer functions: */ |
| 264 | |
| 265 | /* Initialize timers: */ |
George Anzinger | 7978672c | 2006-02-01 03:05:11 -0800 | [diff] [blame] | 266 | extern void hrtimer_init(struct hrtimer *timer, clockid_t which_clock, |
| 267 | enum hrtimer_mode mode); |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 268 | |
Thomas Gleixner | 237fc6e | 2008-04-30 00:55:04 -0700 | [diff] [blame] | 269 | #ifdef CONFIG_DEBUG_OBJECTS_TIMERS |
| 270 | extern void hrtimer_init_on_stack(struct hrtimer *timer, clockid_t which_clock, |
| 271 | enum hrtimer_mode mode); |
| 272 | |
| 273 | extern void destroy_hrtimer_on_stack(struct hrtimer *timer); |
| 274 | #else |
| 275 | static inline void hrtimer_init_on_stack(struct hrtimer *timer, |
| 276 | clockid_t which_clock, |
| 277 | enum hrtimer_mode mode) |
| 278 | { |
| 279 | hrtimer_init(timer, which_clock, mode); |
| 280 | } |
| 281 | static inline void destroy_hrtimer_on_stack(struct hrtimer *timer) { } |
| 282 | #endif |
| 283 | |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 284 | /* Basic timer operations: */ |
| 285 | extern int hrtimer_start(struct hrtimer *timer, ktime_t tim, |
| 286 | const enum hrtimer_mode mode); |
| 287 | extern int hrtimer_cancel(struct hrtimer *timer); |
| 288 | extern int hrtimer_try_to_cancel(struct hrtimer *timer); |
| 289 | |
Thomas Gleixner | c9cb2e3 | 2007-02-16 01:27:49 -0800 | [diff] [blame] | 290 | static inline int hrtimer_restart(struct hrtimer *timer) |
| 291 | { |
| 292 | return hrtimer_start(timer, timer->expires, HRTIMER_MODE_ABS); |
| 293 | } |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 294 | |
| 295 | /* Query timers: */ |
| 296 | extern ktime_t hrtimer_get_remaining(const struct hrtimer *timer); |
| 297 | extern int hrtimer_get_res(const clockid_t which_clock, struct timespec *tp); |
| 298 | |
Tony Lindgren | 6923974 | 2006-03-06 15:42:45 -0800 | [diff] [blame] | 299 | extern ktime_t hrtimer_get_next_event(void); |
Tony Lindgren | 6923974 | 2006-03-06 15:42:45 -0800 | [diff] [blame] | 300 | |
Thomas Gleixner | 303e967 | 2007-02-16 01:27:51 -0800 | [diff] [blame] | 301 | /* |
| 302 | * A timer is active, when it is enqueued into the rbtree or the callback |
| 303 | * function is running. |
| 304 | */ |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 305 | static inline int hrtimer_active(const struct hrtimer *timer) |
| 306 | { |
Thomas Gleixner | 303e967 | 2007-02-16 01:27:51 -0800 | [diff] [blame] | 307 | return timer->state != HRTIMER_STATE_INACTIVE; |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 308 | } |
| 309 | |
Thomas Gleixner | 54cdfdb | 2007-02-16 01:28:11 -0800 | [diff] [blame] | 310 | /* |
| 311 | * Helper function to check, whether the timer is on one of the queues |
| 312 | */ |
| 313 | static inline int hrtimer_is_queued(struct hrtimer *timer) |
| 314 | { |
| 315 | return timer->state & |
| 316 | (HRTIMER_STATE_ENQUEUED | HRTIMER_STATE_PENDING); |
| 317 | } |
| 318 | |
Oliver Hartkopp | 4346f65 | 2008-04-30 23:04:37 +0200 | [diff] [blame] | 319 | /* |
| 320 | * Helper function to check, whether the timer is running the callback |
| 321 | * function |
| 322 | */ |
| 323 | static inline int hrtimer_callback_running(struct hrtimer *timer) |
| 324 | { |
| 325 | return timer->state & HRTIMER_STATE_CALLBACK; |
| 326 | } |
| 327 | |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 328 | /* Forward a hrtimer so it expires after now: */ |
Davide Libenzi | 4d672e7 | 2008-02-04 22:27:26 -0800 | [diff] [blame] | 329 | extern u64 |
Roman Zippel | 44f2147 | 2006-03-26 01:38:06 -0800 | [diff] [blame] | 330 | hrtimer_forward(struct hrtimer *timer, ktime_t now, ktime_t interval); |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 331 | |
Davide Libenzi | 5e05ad7 | 2008-02-04 22:27:25 -0800 | [diff] [blame] | 332 | /* Forward a hrtimer so it expires after the hrtimer's current now */ |
Davide Libenzi | 4d672e7 | 2008-02-04 22:27:26 -0800 | [diff] [blame] | 333 | static inline u64 hrtimer_forward_now(struct hrtimer *timer, |
| 334 | ktime_t interval) |
Davide Libenzi | 5e05ad7 | 2008-02-04 22:27:25 -0800 | [diff] [blame] | 335 | { |
| 336 | return hrtimer_forward(timer, timer->base->get_time(), interval); |
| 337 | } |
| 338 | |
Thomas Gleixner | 10c94ec | 2006-01-09 20:52:35 -0800 | [diff] [blame] | 339 | /* Precise sleep: */ |
| 340 | extern long hrtimer_nanosleep(struct timespec *rqtp, |
Oleg Nesterov | 080344b | 2008-02-01 17:29:05 +0300 | [diff] [blame] | 341 | struct timespec __user *rmtp, |
Thomas Gleixner | 10c94ec | 2006-01-09 20:52:35 -0800 | [diff] [blame] | 342 | const enum hrtimer_mode mode, |
| 343 | const clockid_t clockid); |
Toyo Abe | 1711ef3 | 2006-09-29 02:00:28 -0700 | [diff] [blame] | 344 | extern long hrtimer_nanosleep_restart(struct restart_block *restart_block); |
Thomas Gleixner | 10c94ec | 2006-01-09 20:52:35 -0800 | [diff] [blame] | 345 | |
Thomas Gleixner | 00362e3 | 2006-03-31 02:31:17 -0800 | [diff] [blame] | 346 | extern void hrtimer_init_sleeper(struct hrtimer_sleeper *sl, |
| 347 | struct task_struct *tsk); |
| 348 | |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 349 | /* Soft interrupt function to run the hrtimer queues: */ |
| 350 | extern void hrtimer_run_queues(void); |
Peter Zijlstra | d3d7445 | 2008-01-25 21:08:31 +0100 | [diff] [blame] | 351 | extern void hrtimer_run_pending(void); |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 352 | |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 353 | /* Bootup initialization: */ |
| 354 | extern void __init hrtimers_init(void); |
| 355 | |
Thomas Gleixner | 79bf2bb | 2007-02-16 01:28:03 -0800 | [diff] [blame] | 356 | #if BITS_PER_LONG < 64 |
Davide Libenzi | 4d672e7 | 2008-02-04 22:27:26 -0800 | [diff] [blame] | 357 | extern u64 ktime_divns(const ktime_t kt, s64 div); |
Thomas Gleixner | 79bf2bb | 2007-02-16 01:28:03 -0800 | [diff] [blame] | 358 | #else /* BITS_PER_LONG < 64 */ |
Davide Libenzi | 4d672e7 | 2008-02-04 22:27:26 -0800 | [diff] [blame] | 359 | # define ktime_divns(kt, div) (u64)((kt).tv64 / (div)) |
Thomas Gleixner | 79bf2bb | 2007-02-16 01:28:03 -0800 | [diff] [blame] | 360 | #endif |
| 361 | |
Ingo Molnar | 88ad0bf6 | 2007-02-16 01:28:16 -0800 | [diff] [blame] | 362 | /* Show pending timers: */ |
| 363 | extern void sysrq_timer_list_show(void); |
| 364 | |
Ingo Molnar | 82f67cd | 2007-02-16 01:28:13 -0800 | [diff] [blame] | 365 | /* |
| 366 | * Timer-statistics info: |
| 367 | */ |
| 368 | #ifdef CONFIG_TIMER_STATS |
| 369 | |
| 370 | extern void timer_stats_update_stats(void *timer, pid_t pid, void *startf, |
Venki Pallipadi | c5c061b8 | 2007-07-15 23:40:30 -0700 | [diff] [blame] | 371 | void *timerf, char *comm, |
| 372 | unsigned int timer_flag); |
Ingo Molnar | 82f67cd | 2007-02-16 01:28:13 -0800 | [diff] [blame] | 373 | |
| 374 | static inline void timer_stats_account_hrtimer(struct hrtimer *timer) |
| 375 | { |
| 376 | timer_stats_update_stats(timer, timer->start_pid, timer->start_site, |
Venki Pallipadi | c5c061b8 | 2007-07-15 23:40:30 -0700 | [diff] [blame] | 377 | timer->function, timer->start_comm, 0); |
Ingo Molnar | 82f67cd | 2007-02-16 01:28:13 -0800 | [diff] [blame] | 378 | } |
| 379 | |
| 380 | extern void __timer_stats_hrtimer_set_start_info(struct hrtimer *timer, |
| 381 | void *addr); |
| 382 | |
| 383 | static inline void timer_stats_hrtimer_set_start_info(struct hrtimer *timer) |
| 384 | { |
| 385 | __timer_stats_hrtimer_set_start_info(timer, __builtin_return_address(0)); |
| 386 | } |
| 387 | |
| 388 | static inline void timer_stats_hrtimer_clear_start_info(struct hrtimer *timer) |
| 389 | { |
| 390 | timer->start_site = NULL; |
| 391 | } |
| 392 | #else |
| 393 | static inline void timer_stats_account_hrtimer(struct hrtimer *timer) |
| 394 | { |
| 395 | } |
| 396 | |
| 397 | static inline void timer_stats_hrtimer_set_start_info(struct hrtimer *timer) |
| 398 | { |
| 399 | } |
| 400 | |
| 401 | static inline void timer_stats_hrtimer_clear_start_info(struct hrtimer *timer) |
| 402 | { |
| 403 | } |
| 404 | #endif |
| 405 | |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 406 | #endif |