Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 1 | /* |
| 2 | * linux/kernel/hrtimer.c |
| 3 | * |
Thomas Gleixner | 3c8aa39 | 2007-02-16 01:27:50 -0800 | [diff] [blame] | 4 | * Copyright(C) 2005-2006, Thomas Gleixner <tglx@linutronix.de> |
Thomas Gleixner | 79bf2bb | 2007-02-16 01:28:03 -0800 | [diff] [blame] | 5 | * Copyright(C) 2005-2007, Red Hat, Inc., Ingo Molnar |
Thomas Gleixner | 54cdfdb | 2007-02-16 01:28:11 -0800 | [diff] [blame] | 6 | * Copyright(C) 2006-2007 Timesys Corp., Thomas Gleixner |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 7 | * |
| 8 | * High-resolution kernel timers |
| 9 | * |
| 10 | * In contrast to the low-resolution timeout API implemented in |
| 11 | * kernel/timer.c, hrtimers provide finer resolution and accuracy |
| 12 | * depending on system configuration and capabilities. |
| 13 | * |
| 14 | * These timers are currently used for: |
| 15 | * - itimers |
| 16 | * - POSIX timers |
| 17 | * - nanosleep |
| 18 | * - precise in-kernel timing |
| 19 | * |
| 20 | * Started by: Thomas Gleixner and Ingo Molnar |
| 21 | * |
| 22 | * Credits: |
| 23 | * based on kernel/timer.c |
| 24 | * |
Thomas Gleixner | 66188fa | 2006-02-01 03:05:13 -0800 | [diff] [blame] | 25 | * Help, testing, suggestions, bugfixes, improvements were |
| 26 | * provided by: |
| 27 | * |
| 28 | * George Anzinger, Andrew Morton, Steven Rostedt, Roman Zippel |
| 29 | * et. al. |
| 30 | * |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 31 | * For licencing details see kernel-base/COPYING |
| 32 | */ |
| 33 | |
| 34 | #include <linux/cpu.h> |
Thomas Gleixner | 54cdfdb | 2007-02-16 01:28:11 -0800 | [diff] [blame] | 35 | #include <linux/irq.h> |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 36 | #include <linux/module.h> |
| 37 | #include <linux/percpu.h> |
| 38 | #include <linux/hrtimer.h> |
| 39 | #include <linux/notifier.h> |
| 40 | #include <linux/syscalls.h> |
Thomas Gleixner | 54cdfdb | 2007-02-16 01:28:11 -0800 | [diff] [blame] | 41 | #include <linux/kallsyms.h> |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 42 | #include <linux/interrupt.h> |
Thomas Gleixner | 79bf2bb | 2007-02-16 01:28:03 -0800 | [diff] [blame] | 43 | #include <linux/tick.h> |
Thomas Gleixner | 54cdfdb | 2007-02-16 01:28:11 -0800 | [diff] [blame] | 44 | #include <linux/seq_file.h> |
| 45 | #include <linux/err.h> |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 46 | |
| 47 | #include <asm/uaccess.h> |
| 48 | |
| 49 | /** |
| 50 | * ktime_get - get the monotonic time in ktime_t format |
| 51 | * |
| 52 | * returns the time in ktime_t format |
| 53 | */ |
Thomas Gleixner | d316c57 | 2007-02-16 01:28:00 -0800 | [diff] [blame] | 54 | ktime_t ktime_get(void) |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 55 | { |
| 56 | struct timespec now; |
| 57 | |
| 58 | ktime_get_ts(&now); |
| 59 | |
| 60 | return timespec_to_ktime(now); |
| 61 | } |
Patrick McHardy | 641b9e0 | 2007-03-16 01:18:42 -0700 | [diff] [blame] | 62 | EXPORT_SYMBOL_GPL(ktime_get); |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 63 | |
| 64 | /** |
| 65 | * ktime_get_real - get the real (wall-) time in ktime_t format |
| 66 | * |
| 67 | * returns the time in ktime_t format |
| 68 | */ |
Thomas Gleixner | d316c57 | 2007-02-16 01:28:00 -0800 | [diff] [blame] | 69 | ktime_t ktime_get_real(void) |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 70 | { |
| 71 | struct timespec now; |
| 72 | |
| 73 | getnstimeofday(&now); |
| 74 | |
| 75 | return timespec_to_ktime(now); |
| 76 | } |
| 77 | |
| 78 | EXPORT_SYMBOL_GPL(ktime_get_real); |
| 79 | |
| 80 | /* |
| 81 | * The timer bases: |
George Anzinger | 7978672 | 2006-02-01 03:05:11 -0800 | [diff] [blame] | 82 | * |
| 83 | * Note: If we want to add new timer bases, we have to skip the two |
| 84 | * clock ids captured by the cpu-timers. We do this by holding empty |
| 85 | * entries rather than doing math adjustment of the clock ids. |
| 86 | * This ensures that we capture erroneous accesses to these clock ids |
| 87 | * rather than moving them into the range of valid clock id's. |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 88 | */ |
Thomas Gleixner | 54cdfdb | 2007-02-16 01:28:11 -0800 | [diff] [blame] | 89 | DEFINE_PER_CPU(struct hrtimer_cpu_base, hrtimer_bases) = |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 90 | { |
Thomas Gleixner | 3c8aa39 | 2007-02-16 01:27:50 -0800 | [diff] [blame] | 91 | |
| 92 | .clock_base = |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 93 | { |
Thomas Gleixner | 3c8aa39 | 2007-02-16 01:27:50 -0800 | [diff] [blame] | 94 | { |
| 95 | .index = CLOCK_REALTIME, |
| 96 | .get_time = &ktime_get_real, |
Thomas Gleixner | 54cdfdb | 2007-02-16 01:28:11 -0800 | [diff] [blame] | 97 | .resolution = KTIME_LOW_RES, |
Thomas Gleixner | 3c8aa39 | 2007-02-16 01:27:50 -0800 | [diff] [blame] | 98 | }, |
| 99 | { |
| 100 | .index = CLOCK_MONOTONIC, |
| 101 | .get_time = &ktime_get, |
Thomas Gleixner | 54cdfdb | 2007-02-16 01:28:11 -0800 | [diff] [blame] | 102 | .resolution = KTIME_LOW_RES, |
Thomas Gleixner | 3c8aa39 | 2007-02-16 01:27:50 -0800 | [diff] [blame] | 103 | }, |
| 104 | } |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 105 | }; |
| 106 | |
| 107 | /** |
| 108 | * ktime_get_ts - get the monotonic clock in timespec format |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 109 | * @ts: pointer to timespec variable |
| 110 | * |
| 111 | * The function calculates the monotonic clock from the realtime |
| 112 | * clock and the wall_to_monotonic offset and stores the result |
Robert P. J. Day | 72fd4a3 | 2007-02-10 01:45:59 -0800 | [diff] [blame] | 113 | * in normalized timespec format in the variable pointed to by @ts. |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 114 | */ |
| 115 | void ktime_get_ts(struct timespec *ts) |
| 116 | { |
| 117 | struct timespec tomono; |
| 118 | unsigned long seq; |
| 119 | |
| 120 | do { |
| 121 | seq = read_seqbegin(&xtime_lock); |
| 122 | getnstimeofday(ts); |
| 123 | tomono = wall_to_monotonic; |
| 124 | |
| 125 | } while (read_seqretry(&xtime_lock, seq)); |
| 126 | |
| 127 | set_normalized_timespec(ts, ts->tv_sec + tomono.tv_sec, |
| 128 | ts->tv_nsec + tomono.tv_nsec); |
| 129 | } |
Matt Helsley | 69778e3 | 2006-01-09 20:52:39 -0800 | [diff] [blame] | 130 | EXPORT_SYMBOL_GPL(ktime_get_ts); |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 131 | |
| 132 | /* |
Thomas Gleixner | 92127c7 | 2006-03-26 01:38:05 -0800 | [diff] [blame] | 133 | * Get the coarse grained time at the softirq based on xtime and |
| 134 | * wall_to_monotonic. |
| 135 | */ |
Thomas Gleixner | 3c8aa39 | 2007-02-16 01:27:50 -0800 | [diff] [blame] | 136 | static void hrtimer_get_softirq_time(struct hrtimer_cpu_base *base) |
Thomas Gleixner | 92127c7 | 2006-03-26 01:38:05 -0800 | [diff] [blame] | 137 | { |
| 138 | ktime_t xtim, tomono; |
Thomas Gleixner | ad28d94 | 2007-03-16 13:38:21 -0800 | [diff] [blame] | 139 | struct timespec xts, tom; |
Thomas Gleixner | 92127c7 | 2006-03-26 01:38:05 -0800 | [diff] [blame] | 140 | unsigned long seq; |
| 141 | |
| 142 | do { |
| 143 | seq = read_seqbegin(&xtime_lock); |
john stultz | f4304ab | 2007-02-16 01:27:26 -0800 | [diff] [blame] | 144 | #ifdef CONFIG_NO_HZ |
| 145 | getnstimeofday(&xts); |
| 146 | #else |
| 147 | xts = xtime; |
| 148 | #endif |
Thomas Gleixner | ad28d94 | 2007-03-16 13:38:21 -0800 | [diff] [blame] | 149 | tom = wall_to_monotonic; |
Thomas Gleixner | 92127c7 | 2006-03-26 01:38:05 -0800 | [diff] [blame] | 150 | } while (read_seqretry(&xtime_lock, seq)); |
| 151 | |
john stultz | f4304ab | 2007-02-16 01:27:26 -0800 | [diff] [blame] | 152 | xtim = timespec_to_ktime(xts); |
Thomas Gleixner | ad28d94 | 2007-03-16 13:38:21 -0800 | [diff] [blame] | 153 | tomono = timespec_to_ktime(tom); |
Thomas Gleixner | 3c8aa39 | 2007-02-16 01:27:50 -0800 | [diff] [blame] | 154 | base->clock_base[CLOCK_REALTIME].softirq_time = xtim; |
| 155 | base->clock_base[CLOCK_MONOTONIC].softirq_time = |
| 156 | ktime_add(xtim, tomono); |
Thomas Gleixner | 92127c7 | 2006-03-26 01:38:05 -0800 | [diff] [blame] | 157 | } |
| 158 | |
| 159 | /* |
Thomas Gleixner | 303e967 | 2007-02-16 01:27:51 -0800 | [diff] [blame] | 160 | * Helper function to check, whether the timer is running the callback |
| 161 | * function |
| 162 | */ |
| 163 | static inline int hrtimer_callback_running(struct hrtimer *timer) |
| 164 | { |
| 165 | return timer->state & HRTIMER_STATE_CALLBACK; |
| 166 | } |
| 167 | |
| 168 | /* |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 169 | * Functions and macros which are different for UP/SMP systems are kept in a |
| 170 | * single place |
| 171 | */ |
| 172 | #ifdef CONFIG_SMP |
| 173 | |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 174 | /* |
| 175 | * We are using hashed locking: holding per_cpu(hrtimer_bases)[n].lock |
| 176 | * means that all timers which are tied to this base via timer->base are |
| 177 | * locked, and the base itself is locked too. |
| 178 | * |
| 179 | * So __run_timers/migrate_timers can safely modify all timers which could |
| 180 | * be found on the lists/queues. |
| 181 | * |
| 182 | * When the timer's base is locked, and the timer removed from list, it is |
| 183 | * possible to set timer->base = NULL and drop the lock: the timer remains |
| 184 | * locked. |
| 185 | */ |
Thomas Gleixner | 3c8aa39 | 2007-02-16 01:27:50 -0800 | [diff] [blame] | 186 | static |
| 187 | struct hrtimer_clock_base *lock_hrtimer_base(const struct hrtimer *timer, |
| 188 | unsigned long *flags) |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 189 | { |
Thomas Gleixner | 3c8aa39 | 2007-02-16 01:27:50 -0800 | [diff] [blame] | 190 | struct hrtimer_clock_base *base; |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 191 | |
| 192 | for (;;) { |
| 193 | base = timer->base; |
| 194 | if (likely(base != NULL)) { |
Thomas Gleixner | 3c8aa39 | 2007-02-16 01:27:50 -0800 | [diff] [blame] | 195 | spin_lock_irqsave(&base->cpu_base->lock, *flags); |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 196 | if (likely(base == timer->base)) |
| 197 | return base; |
| 198 | /* The timer has migrated to another CPU: */ |
Thomas Gleixner | 3c8aa39 | 2007-02-16 01:27:50 -0800 | [diff] [blame] | 199 | spin_unlock_irqrestore(&base->cpu_base->lock, *flags); |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 200 | } |
| 201 | cpu_relax(); |
| 202 | } |
| 203 | } |
| 204 | |
| 205 | /* |
| 206 | * Switch the timer base to the current CPU when possible. |
| 207 | */ |
Thomas Gleixner | 3c8aa39 | 2007-02-16 01:27:50 -0800 | [diff] [blame] | 208 | static inline struct hrtimer_clock_base * |
| 209 | switch_hrtimer_base(struct hrtimer *timer, struct hrtimer_clock_base *base) |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 210 | { |
Thomas Gleixner | 3c8aa39 | 2007-02-16 01:27:50 -0800 | [diff] [blame] | 211 | struct hrtimer_clock_base *new_base; |
| 212 | struct hrtimer_cpu_base *new_cpu_base; |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 213 | |
Thomas Gleixner | 3c8aa39 | 2007-02-16 01:27:50 -0800 | [diff] [blame] | 214 | new_cpu_base = &__get_cpu_var(hrtimer_bases); |
| 215 | new_base = &new_cpu_base->clock_base[base->index]; |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 216 | |
| 217 | if (base != new_base) { |
| 218 | /* |
| 219 | * We are trying to schedule the timer on the local CPU. |
| 220 | * However we can't change timer's base while it is running, |
| 221 | * so we keep it on the same CPU. No hassle vs. reprogramming |
| 222 | * the event source in the high resolution case. The softirq |
| 223 | * code will take care of this when the timer function has |
| 224 | * completed. There is no conflict as we hold the lock until |
| 225 | * the timer is enqueued. |
| 226 | */ |
Thomas Gleixner | 54cdfdb | 2007-02-16 01:28:11 -0800 | [diff] [blame] | 227 | if (unlikely(hrtimer_callback_running(timer))) |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 228 | return base; |
| 229 | |
| 230 | /* See the comment in lock_timer_base() */ |
| 231 | timer->base = NULL; |
Thomas Gleixner | 3c8aa39 | 2007-02-16 01:27:50 -0800 | [diff] [blame] | 232 | spin_unlock(&base->cpu_base->lock); |
| 233 | spin_lock(&new_base->cpu_base->lock); |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 234 | timer->base = new_base; |
| 235 | } |
| 236 | return new_base; |
| 237 | } |
| 238 | |
| 239 | #else /* CONFIG_SMP */ |
| 240 | |
Thomas Gleixner | 3c8aa39 | 2007-02-16 01:27:50 -0800 | [diff] [blame] | 241 | static inline struct hrtimer_clock_base * |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 242 | lock_hrtimer_base(const struct hrtimer *timer, unsigned long *flags) |
| 243 | { |
Thomas Gleixner | 3c8aa39 | 2007-02-16 01:27:50 -0800 | [diff] [blame] | 244 | struct hrtimer_clock_base *base = timer->base; |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 245 | |
Thomas Gleixner | 3c8aa39 | 2007-02-16 01:27:50 -0800 | [diff] [blame] | 246 | spin_lock_irqsave(&base->cpu_base->lock, *flags); |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 247 | |
| 248 | return base; |
| 249 | } |
| 250 | |
Thomas Gleixner | 54cdfdb | 2007-02-16 01:28:11 -0800 | [diff] [blame] | 251 | # define switch_hrtimer_base(t, b) (b) |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 252 | |
| 253 | #endif /* !CONFIG_SMP */ |
| 254 | |
| 255 | /* |
| 256 | * Functions for the union type storage format of ktime_t which are |
| 257 | * too large for inlining: |
| 258 | */ |
| 259 | #if BITS_PER_LONG < 64 |
| 260 | # ifndef CONFIG_KTIME_SCALAR |
| 261 | /** |
| 262 | * ktime_add_ns - Add a scalar nanoseconds value to a ktime_t variable |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 263 | * @kt: addend |
| 264 | * @nsec: the scalar nsec value to add |
| 265 | * |
| 266 | * Returns the sum of kt and nsec in ktime_t format |
| 267 | */ |
| 268 | ktime_t ktime_add_ns(const ktime_t kt, u64 nsec) |
| 269 | { |
| 270 | ktime_t tmp; |
| 271 | |
| 272 | if (likely(nsec < NSEC_PER_SEC)) { |
| 273 | tmp.tv64 = nsec; |
| 274 | } else { |
| 275 | unsigned long rem = do_div(nsec, NSEC_PER_SEC); |
| 276 | |
| 277 | tmp = ktime_set((long)nsec, rem); |
| 278 | } |
| 279 | |
| 280 | return ktime_add(kt, tmp); |
| 281 | } |
David Howells | b8b8fd2 | 2007-04-27 15:31:24 -0700 | [diff] [blame] | 282 | |
| 283 | EXPORT_SYMBOL_GPL(ktime_add_ns); |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 284 | # endif /* !CONFIG_KTIME_SCALAR */ |
| 285 | |
| 286 | /* |
| 287 | * Divide a ktime value by a nanosecond value |
| 288 | */ |
Thomas Gleixner | 79bf2bb | 2007-02-16 01:28:03 -0800 | [diff] [blame] | 289 | unsigned long ktime_divns(const ktime_t kt, s64 div) |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 290 | { |
| 291 | u64 dclc, inc, dns; |
| 292 | int sft = 0; |
| 293 | |
| 294 | dclc = dns = ktime_to_ns(kt); |
| 295 | inc = div; |
| 296 | /* Make sure the divisor is less than 2^32: */ |
| 297 | while (div >> 32) { |
| 298 | sft++; |
| 299 | div >>= 1; |
| 300 | } |
| 301 | dclc >>= sft; |
| 302 | do_div(dclc, (unsigned long) div); |
| 303 | |
| 304 | return (unsigned long) dclc; |
| 305 | } |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 306 | #endif /* BITS_PER_LONG >= 64 */ |
| 307 | |
Thomas Gleixner | 54cdfdb | 2007-02-16 01:28:11 -0800 | [diff] [blame] | 308 | /* High resolution timer related functions */ |
| 309 | #ifdef CONFIG_HIGH_RES_TIMERS |
| 310 | |
| 311 | /* |
| 312 | * High resolution timer enabled ? |
| 313 | */ |
| 314 | static int hrtimer_hres_enabled __read_mostly = 1; |
| 315 | |
| 316 | /* |
| 317 | * Enable / Disable high resolution mode |
| 318 | */ |
| 319 | static int __init setup_hrtimer_hres(char *str) |
| 320 | { |
| 321 | if (!strcmp(str, "off")) |
| 322 | hrtimer_hres_enabled = 0; |
| 323 | else if (!strcmp(str, "on")) |
| 324 | hrtimer_hres_enabled = 1; |
| 325 | else |
| 326 | return 0; |
| 327 | return 1; |
| 328 | } |
| 329 | |
| 330 | __setup("highres=", setup_hrtimer_hres); |
| 331 | |
| 332 | /* |
| 333 | * hrtimer_high_res_enabled - query, if the highres mode is enabled |
| 334 | */ |
| 335 | static inline int hrtimer_is_hres_enabled(void) |
| 336 | { |
| 337 | return hrtimer_hres_enabled; |
| 338 | } |
| 339 | |
| 340 | /* |
| 341 | * Is the high resolution mode active ? |
| 342 | */ |
| 343 | static inline int hrtimer_hres_active(void) |
| 344 | { |
| 345 | return __get_cpu_var(hrtimer_bases).hres_active; |
| 346 | } |
| 347 | |
| 348 | /* |
| 349 | * Reprogram the event source with checking both queues for the |
| 350 | * next event |
| 351 | * Called with interrupts disabled and base->lock held |
| 352 | */ |
| 353 | static void hrtimer_force_reprogram(struct hrtimer_cpu_base *cpu_base) |
| 354 | { |
| 355 | int i; |
| 356 | struct hrtimer_clock_base *base = cpu_base->clock_base; |
| 357 | ktime_t expires; |
| 358 | |
| 359 | cpu_base->expires_next.tv64 = KTIME_MAX; |
| 360 | |
| 361 | for (i = 0; i < HRTIMER_MAX_CLOCK_BASES; i++, base++) { |
| 362 | struct hrtimer *timer; |
| 363 | |
| 364 | if (!base->first) |
| 365 | continue; |
| 366 | timer = rb_entry(base->first, struct hrtimer, node); |
| 367 | expires = ktime_sub(timer->expires, base->offset); |
| 368 | if (expires.tv64 < cpu_base->expires_next.tv64) |
| 369 | cpu_base->expires_next = expires; |
| 370 | } |
| 371 | |
| 372 | if (cpu_base->expires_next.tv64 != KTIME_MAX) |
| 373 | tick_program_event(cpu_base->expires_next, 1); |
| 374 | } |
| 375 | |
| 376 | /* |
| 377 | * Shared reprogramming for clock_realtime and clock_monotonic |
| 378 | * |
| 379 | * When a timer is enqueued and expires earlier than the already enqueued |
| 380 | * timers, we have to check, whether it expires earlier than the timer for |
| 381 | * which the clock event device was armed. |
| 382 | * |
| 383 | * Called with interrupts disabled and base->cpu_base.lock held |
| 384 | */ |
| 385 | static int hrtimer_reprogram(struct hrtimer *timer, |
| 386 | struct hrtimer_clock_base *base) |
| 387 | { |
| 388 | ktime_t *expires_next = &__get_cpu_var(hrtimer_bases).expires_next; |
| 389 | ktime_t expires = ktime_sub(timer->expires, base->offset); |
| 390 | int res; |
| 391 | |
| 392 | /* |
| 393 | * When the callback is running, we do not reprogram the clock event |
| 394 | * device. The timer callback is either running on a different CPU or |
| 395 | * the callback is executed in the hrtimer_interupt context. The |
| 396 | * reprogramming is handled either by the softirq, which called the |
| 397 | * callback or at the end of the hrtimer_interrupt. |
| 398 | */ |
| 399 | if (hrtimer_callback_running(timer)) |
| 400 | return 0; |
| 401 | |
| 402 | if (expires.tv64 >= expires_next->tv64) |
| 403 | return 0; |
| 404 | |
| 405 | /* |
| 406 | * Clockevents returns -ETIME, when the event was in the past. |
| 407 | */ |
| 408 | res = tick_program_event(expires, 0); |
| 409 | if (!IS_ERR_VALUE(res)) |
| 410 | *expires_next = expires; |
| 411 | return res; |
| 412 | } |
| 413 | |
| 414 | |
| 415 | /* |
| 416 | * Retrigger next event is called after clock was set |
| 417 | * |
| 418 | * Called with interrupts disabled via on_each_cpu() |
| 419 | */ |
| 420 | static void retrigger_next_event(void *arg) |
| 421 | { |
| 422 | struct hrtimer_cpu_base *base; |
| 423 | struct timespec realtime_offset; |
| 424 | unsigned long seq; |
| 425 | |
| 426 | if (!hrtimer_hres_active()) |
| 427 | return; |
| 428 | |
| 429 | do { |
| 430 | seq = read_seqbegin(&xtime_lock); |
| 431 | set_normalized_timespec(&realtime_offset, |
| 432 | -wall_to_monotonic.tv_sec, |
| 433 | -wall_to_monotonic.tv_nsec); |
| 434 | } while (read_seqretry(&xtime_lock, seq)); |
| 435 | |
| 436 | base = &__get_cpu_var(hrtimer_bases); |
| 437 | |
| 438 | /* Adjust CLOCK_REALTIME offset */ |
| 439 | spin_lock(&base->lock); |
| 440 | base->clock_base[CLOCK_REALTIME].offset = |
| 441 | timespec_to_ktime(realtime_offset); |
| 442 | |
| 443 | hrtimer_force_reprogram(base); |
| 444 | spin_unlock(&base->lock); |
| 445 | } |
| 446 | |
| 447 | /* |
| 448 | * Clock realtime was set |
| 449 | * |
| 450 | * Change the offset of the realtime clock vs. the monotonic |
| 451 | * clock. |
| 452 | * |
| 453 | * We might have to reprogram the high resolution timer interrupt. On |
| 454 | * SMP we call the architecture specific code to retrigger _all_ high |
| 455 | * resolution timer interrupts. On UP we just disable interrupts and |
| 456 | * call the high resolution interrupt code. |
| 457 | */ |
| 458 | void clock_was_set(void) |
| 459 | { |
| 460 | /* Retrigger the CPU local events everywhere */ |
| 461 | on_each_cpu(retrigger_next_event, NULL, 0, 1); |
| 462 | } |
| 463 | |
| 464 | /* |
Ingo Molnar | 995f054 | 2007-04-07 12:05:00 +0200 | [diff] [blame] | 465 | * During resume we might have to reprogram the high resolution timer |
| 466 | * interrupt (on the local CPU): |
| 467 | */ |
| 468 | void hres_timers_resume(void) |
| 469 | { |
| 470 | WARN_ON_ONCE(num_online_cpus() > 1); |
| 471 | |
| 472 | /* Retrigger the CPU local events: */ |
| 473 | retrigger_next_event(NULL); |
| 474 | } |
| 475 | |
| 476 | /* |
Thomas Gleixner | 54cdfdb | 2007-02-16 01:28:11 -0800 | [diff] [blame] | 477 | * Check, whether the timer is on the callback pending list |
| 478 | */ |
| 479 | static inline int hrtimer_cb_pending(const struct hrtimer *timer) |
| 480 | { |
| 481 | return timer->state & HRTIMER_STATE_PENDING; |
| 482 | } |
| 483 | |
| 484 | /* |
| 485 | * Remove a timer from the callback pending list |
| 486 | */ |
| 487 | static inline void hrtimer_remove_cb_pending(struct hrtimer *timer) |
| 488 | { |
| 489 | list_del_init(&timer->cb_entry); |
| 490 | } |
| 491 | |
| 492 | /* |
| 493 | * Initialize the high resolution related parts of cpu_base |
| 494 | */ |
| 495 | static inline void hrtimer_init_hres(struct hrtimer_cpu_base *base) |
| 496 | { |
| 497 | base->expires_next.tv64 = KTIME_MAX; |
| 498 | base->hres_active = 0; |
| 499 | INIT_LIST_HEAD(&base->cb_pending); |
| 500 | } |
| 501 | |
| 502 | /* |
| 503 | * Initialize the high resolution related parts of a hrtimer |
| 504 | */ |
| 505 | static inline void hrtimer_init_timer_hres(struct hrtimer *timer) |
| 506 | { |
| 507 | INIT_LIST_HEAD(&timer->cb_entry); |
| 508 | } |
| 509 | |
| 510 | /* |
| 511 | * When High resolution timers are active, try to reprogram. Note, that in case |
| 512 | * the state has HRTIMER_STATE_CALLBACK set, no reprogramming and no expiry |
| 513 | * check happens. The timer gets enqueued into the rbtree. The reprogramming |
| 514 | * and expiry check is done in the hrtimer_interrupt or in the softirq. |
| 515 | */ |
| 516 | static inline int hrtimer_enqueue_reprogram(struct hrtimer *timer, |
| 517 | struct hrtimer_clock_base *base) |
| 518 | { |
| 519 | if (base->cpu_base->hres_active && hrtimer_reprogram(timer, base)) { |
| 520 | |
| 521 | /* Timer is expired, act upon the callback mode */ |
| 522 | switch(timer->cb_mode) { |
| 523 | case HRTIMER_CB_IRQSAFE_NO_RESTART: |
| 524 | /* |
| 525 | * We can call the callback from here. No restart |
| 526 | * happens, so no danger of recursion |
| 527 | */ |
| 528 | BUG_ON(timer->function(timer) != HRTIMER_NORESTART); |
| 529 | return 1; |
| 530 | case HRTIMER_CB_IRQSAFE_NO_SOFTIRQ: |
| 531 | /* |
| 532 | * This is solely for the sched tick emulation with |
| 533 | * dynamic tick support to ensure that we do not |
| 534 | * restart the tick right on the edge and end up with |
| 535 | * the tick timer in the softirq ! The calling site |
| 536 | * takes care of this. |
| 537 | */ |
| 538 | return 1; |
| 539 | case HRTIMER_CB_IRQSAFE: |
| 540 | case HRTIMER_CB_SOFTIRQ: |
| 541 | /* |
| 542 | * Move everything else into the softirq pending list ! |
| 543 | */ |
| 544 | list_add_tail(&timer->cb_entry, |
| 545 | &base->cpu_base->cb_pending); |
| 546 | timer->state = HRTIMER_STATE_PENDING; |
| 547 | raise_softirq(HRTIMER_SOFTIRQ); |
| 548 | return 1; |
| 549 | default: |
| 550 | BUG(); |
| 551 | } |
| 552 | } |
| 553 | return 0; |
| 554 | } |
| 555 | |
| 556 | /* |
| 557 | * Switch to high resolution mode |
| 558 | */ |
Thomas Gleixner | f895385 | 2007-03-06 01:42:08 -0800 | [diff] [blame] | 559 | static int hrtimer_switch_to_hres(void) |
Thomas Gleixner | 54cdfdb | 2007-02-16 01:28:11 -0800 | [diff] [blame] | 560 | { |
Ingo Molnar | 820de5c | 2007-07-21 04:37:36 -0700 | [diff] [blame^] | 561 | int cpu = smp_processor_id(); |
| 562 | struct hrtimer_cpu_base *base = &per_cpu(hrtimer_bases, cpu); |
Thomas Gleixner | 54cdfdb | 2007-02-16 01:28:11 -0800 | [diff] [blame] | 563 | unsigned long flags; |
| 564 | |
| 565 | if (base->hres_active) |
Thomas Gleixner | f895385 | 2007-03-06 01:42:08 -0800 | [diff] [blame] | 566 | return 1; |
Thomas Gleixner | 54cdfdb | 2007-02-16 01:28:11 -0800 | [diff] [blame] | 567 | |
| 568 | local_irq_save(flags); |
| 569 | |
| 570 | if (tick_init_highres()) { |
| 571 | local_irq_restore(flags); |
Ingo Molnar | 820de5c | 2007-07-21 04:37:36 -0700 | [diff] [blame^] | 572 | printk(KERN_WARNING "Could not switch to high resolution " |
| 573 | "mode on CPU %d\n", cpu); |
Thomas Gleixner | f895385 | 2007-03-06 01:42:08 -0800 | [diff] [blame] | 574 | return 0; |
Thomas Gleixner | 54cdfdb | 2007-02-16 01:28:11 -0800 | [diff] [blame] | 575 | } |
| 576 | base->hres_active = 1; |
| 577 | base->clock_base[CLOCK_REALTIME].resolution = KTIME_HIGH_RES; |
| 578 | base->clock_base[CLOCK_MONOTONIC].resolution = KTIME_HIGH_RES; |
| 579 | |
| 580 | tick_setup_sched_timer(); |
| 581 | |
| 582 | /* "Retrigger" the interrupt to get things going */ |
| 583 | retrigger_next_event(NULL); |
| 584 | local_irq_restore(flags); |
| 585 | printk(KERN_INFO "Switched to high resolution mode on CPU %d\n", |
| 586 | smp_processor_id()); |
Thomas Gleixner | f895385 | 2007-03-06 01:42:08 -0800 | [diff] [blame] | 587 | return 1; |
Thomas Gleixner | 54cdfdb | 2007-02-16 01:28:11 -0800 | [diff] [blame] | 588 | } |
| 589 | |
| 590 | #else |
| 591 | |
| 592 | static inline int hrtimer_hres_active(void) { return 0; } |
| 593 | static inline int hrtimer_is_hres_enabled(void) { return 0; } |
Thomas Gleixner | f895385 | 2007-03-06 01:42:08 -0800 | [diff] [blame] | 594 | static inline int hrtimer_switch_to_hres(void) { return 0; } |
Thomas Gleixner | 54cdfdb | 2007-02-16 01:28:11 -0800 | [diff] [blame] | 595 | static inline void hrtimer_force_reprogram(struct hrtimer_cpu_base *base) { } |
| 596 | static inline int hrtimer_enqueue_reprogram(struct hrtimer *timer, |
| 597 | struct hrtimer_clock_base *base) |
| 598 | { |
| 599 | return 0; |
| 600 | } |
| 601 | static inline int hrtimer_cb_pending(struct hrtimer *timer) { return 0; } |
| 602 | static inline void hrtimer_remove_cb_pending(struct hrtimer *timer) { } |
| 603 | static inline void hrtimer_init_hres(struct hrtimer_cpu_base *base) { } |
| 604 | static inline void hrtimer_init_timer_hres(struct hrtimer *timer) { } |
| 605 | |
| 606 | #endif /* CONFIG_HIGH_RES_TIMERS */ |
| 607 | |
Ingo Molnar | 82f67cd | 2007-02-16 01:28:13 -0800 | [diff] [blame] | 608 | #ifdef CONFIG_TIMER_STATS |
| 609 | void __timer_stats_hrtimer_set_start_info(struct hrtimer *timer, void *addr) |
| 610 | { |
| 611 | if (timer->start_site) |
| 612 | return; |
| 613 | |
| 614 | timer->start_site = addr; |
| 615 | memcpy(timer->start_comm, current->comm, TASK_COMM_LEN); |
| 616 | timer->start_pid = current->pid; |
| 617 | } |
| 618 | #endif |
| 619 | |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 620 | /* |
| 621 | * Counterpart to lock_timer_base above: |
| 622 | */ |
| 623 | static inline |
| 624 | void unlock_hrtimer_base(const struct hrtimer *timer, unsigned long *flags) |
| 625 | { |
Thomas Gleixner | 3c8aa39 | 2007-02-16 01:27:50 -0800 | [diff] [blame] | 626 | spin_unlock_irqrestore(&timer->base->cpu_base->lock, *flags); |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 627 | } |
| 628 | |
| 629 | /** |
| 630 | * hrtimer_forward - forward the timer expiry |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 631 | * @timer: hrtimer to forward |
Roman Zippel | 44f2147 | 2006-03-26 01:38:06 -0800 | [diff] [blame] | 632 | * @now: forward past this time |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 633 | * @interval: the interval to forward |
| 634 | * |
| 635 | * Forward the timer expiry so it will expire in the future. |
Jonathan Corbet | 8dca6f3 | 2006-01-16 15:58:55 -0700 | [diff] [blame] | 636 | * Returns the number of overruns. |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 637 | */ |
| 638 | unsigned long |
Roman Zippel | 44f2147 | 2006-03-26 01:38:06 -0800 | [diff] [blame] | 639 | hrtimer_forward(struct hrtimer *timer, ktime_t now, ktime_t interval) |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 640 | { |
| 641 | unsigned long orun = 1; |
Roman Zippel | 44f2147 | 2006-03-26 01:38:06 -0800 | [diff] [blame] | 642 | ktime_t delta; |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 643 | |
| 644 | delta = ktime_sub(now, timer->expires); |
| 645 | |
| 646 | if (delta.tv64 < 0) |
| 647 | return 0; |
| 648 | |
Thomas Gleixner | c9db4fa | 2006-01-12 11:47:34 +0100 | [diff] [blame] | 649 | if (interval.tv64 < timer->base->resolution.tv64) |
| 650 | interval.tv64 = timer->base->resolution.tv64; |
| 651 | |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 652 | if (unlikely(delta.tv64 >= interval.tv64)) { |
Roman Zippel | df869b6 | 2006-03-26 01:38:11 -0800 | [diff] [blame] | 653 | s64 incr = ktime_to_ns(interval); |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 654 | |
| 655 | orun = ktime_divns(delta, incr); |
| 656 | timer->expires = ktime_add_ns(timer->expires, incr * orun); |
| 657 | if (timer->expires.tv64 > now.tv64) |
| 658 | return orun; |
| 659 | /* |
| 660 | * This (and the ktime_add() below) is the |
| 661 | * correction for exact: |
| 662 | */ |
| 663 | orun++; |
| 664 | } |
| 665 | timer->expires = ktime_add(timer->expires, interval); |
Thomas Gleixner | 13788cc | 2007-03-16 13:38:20 -0800 | [diff] [blame] | 666 | /* |
| 667 | * Make sure, that the result did not wrap with a very large |
| 668 | * interval. |
| 669 | */ |
| 670 | if (timer->expires.tv64 < 0) |
| 671 | timer->expires = ktime_set(KTIME_SEC_MAX, 0); |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 672 | |
| 673 | return orun; |
| 674 | } |
Stas Sergeev | 6bdb6b6 | 2007-05-08 00:31:58 -0700 | [diff] [blame] | 675 | EXPORT_SYMBOL_GPL(hrtimer_forward); |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 676 | |
| 677 | /* |
| 678 | * enqueue_hrtimer - internal function to (re)start a timer |
| 679 | * |
| 680 | * The timer is inserted in expiry order. Insertion into the |
| 681 | * red black tree is O(log(n)). Must hold the base lock. |
| 682 | */ |
Thomas Gleixner | 3c8aa39 | 2007-02-16 01:27:50 -0800 | [diff] [blame] | 683 | static void enqueue_hrtimer(struct hrtimer *timer, |
Thomas Gleixner | 54cdfdb | 2007-02-16 01:28:11 -0800 | [diff] [blame] | 684 | struct hrtimer_clock_base *base, int reprogram) |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 685 | { |
| 686 | struct rb_node **link = &base->active.rb_node; |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 687 | struct rb_node *parent = NULL; |
| 688 | struct hrtimer *entry; |
| 689 | |
| 690 | /* |
| 691 | * Find the right place in the rbtree: |
| 692 | */ |
| 693 | while (*link) { |
| 694 | parent = *link; |
| 695 | entry = rb_entry(parent, struct hrtimer, node); |
| 696 | /* |
| 697 | * We dont care about collisions. Nodes with |
| 698 | * the same expiry time stay together. |
| 699 | */ |
| 700 | if (timer->expires.tv64 < entry->expires.tv64) |
| 701 | link = &(*link)->rb_left; |
Thomas Gleixner | 288867e | 2006-01-12 11:25:54 +0100 | [diff] [blame] | 702 | else |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 703 | link = &(*link)->rb_right; |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 704 | } |
| 705 | |
| 706 | /* |
Thomas Gleixner | 288867e | 2006-01-12 11:25:54 +0100 | [diff] [blame] | 707 | * Insert the timer to the rbtree and check whether it |
| 708 | * replaces the first pending timer |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 709 | */ |
Thomas Gleixner | 54cdfdb | 2007-02-16 01:28:11 -0800 | [diff] [blame] | 710 | if (!base->first || timer->expires.tv64 < |
| 711 | rb_entry(base->first, struct hrtimer, node)->expires.tv64) { |
| 712 | /* |
| 713 | * Reprogram the clock event device. When the timer is already |
| 714 | * expired hrtimer_enqueue_reprogram has either called the |
| 715 | * callback or added it to the pending list and raised the |
| 716 | * softirq. |
| 717 | * |
| 718 | * This is a NOP for !HIGHRES |
| 719 | */ |
| 720 | if (reprogram && hrtimer_enqueue_reprogram(timer, base)) |
| 721 | return; |
| 722 | |
| 723 | base->first = &timer->node; |
| 724 | } |
| 725 | |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 726 | rb_link_node(&timer->node, parent, link); |
| 727 | rb_insert_color(&timer->node, &base->active); |
Thomas Gleixner | 303e967 | 2007-02-16 01:27:51 -0800 | [diff] [blame] | 728 | /* |
| 729 | * HRTIMER_STATE_ENQUEUED is or'ed to the current state to preserve the |
| 730 | * state of a possibly running callback. |
| 731 | */ |
| 732 | timer->state |= HRTIMER_STATE_ENQUEUED; |
Thomas Gleixner | 288867e | 2006-01-12 11:25:54 +0100 | [diff] [blame] | 733 | } |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 734 | |
| 735 | /* |
| 736 | * __remove_hrtimer - internal function to remove a timer |
| 737 | * |
| 738 | * Caller must hold the base lock. |
Thomas Gleixner | 54cdfdb | 2007-02-16 01:28:11 -0800 | [diff] [blame] | 739 | * |
| 740 | * High resolution timer mode reprograms the clock event device when the |
| 741 | * timer is the one which expires next. The caller can disable this by setting |
| 742 | * reprogram to zero. This is useful, when the context does a reprogramming |
| 743 | * anyway (e.g. timer interrupt) |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 744 | */ |
Thomas Gleixner | 3c8aa39 | 2007-02-16 01:27:50 -0800 | [diff] [blame] | 745 | static void __remove_hrtimer(struct hrtimer *timer, |
Thomas Gleixner | 303e967 | 2007-02-16 01:27:51 -0800 | [diff] [blame] | 746 | struct hrtimer_clock_base *base, |
Thomas Gleixner | 54cdfdb | 2007-02-16 01:28:11 -0800 | [diff] [blame] | 747 | unsigned long newstate, int reprogram) |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 748 | { |
Thomas Gleixner | 54cdfdb | 2007-02-16 01:28:11 -0800 | [diff] [blame] | 749 | /* High res. callback list. NOP for !HIGHRES */ |
| 750 | if (hrtimer_cb_pending(timer)) |
| 751 | hrtimer_remove_cb_pending(timer); |
| 752 | else { |
| 753 | /* |
| 754 | * Remove the timer from the rbtree and replace the |
| 755 | * first entry pointer if necessary. |
| 756 | */ |
| 757 | if (base->first == &timer->node) { |
| 758 | base->first = rb_next(&timer->node); |
| 759 | /* Reprogram the clock event device. if enabled */ |
| 760 | if (reprogram && hrtimer_hres_active()) |
| 761 | hrtimer_force_reprogram(base->cpu_base); |
| 762 | } |
| 763 | rb_erase(&timer->node, &base->active); |
| 764 | } |
Thomas Gleixner | 303e967 | 2007-02-16 01:27:51 -0800 | [diff] [blame] | 765 | timer->state = newstate; |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 766 | } |
| 767 | |
| 768 | /* |
| 769 | * remove hrtimer, called with base lock held |
| 770 | */ |
| 771 | static inline int |
Thomas Gleixner | 3c8aa39 | 2007-02-16 01:27:50 -0800 | [diff] [blame] | 772 | remove_hrtimer(struct hrtimer *timer, struct hrtimer_clock_base *base) |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 773 | { |
Thomas Gleixner | 303e967 | 2007-02-16 01:27:51 -0800 | [diff] [blame] | 774 | if (hrtimer_is_queued(timer)) { |
Thomas Gleixner | 54cdfdb | 2007-02-16 01:28:11 -0800 | [diff] [blame] | 775 | int reprogram; |
| 776 | |
| 777 | /* |
| 778 | * Remove the timer and force reprogramming when high |
| 779 | * resolution mode is active and the timer is on the current |
| 780 | * CPU. If we remove a timer on another CPU, reprogramming is |
| 781 | * skipped. The interrupt event on this CPU is fired and |
| 782 | * reprogramming happens in the interrupt handler. This is a |
| 783 | * rare case and less expensive than a smp call. |
| 784 | */ |
Ingo Molnar | 82f67cd | 2007-02-16 01:28:13 -0800 | [diff] [blame] | 785 | timer_stats_hrtimer_clear_start_info(timer); |
Thomas Gleixner | 54cdfdb | 2007-02-16 01:28:11 -0800 | [diff] [blame] | 786 | reprogram = base->cpu_base == &__get_cpu_var(hrtimer_bases); |
| 787 | __remove_hrtimer(timer, base, HRTIMER_STATE_INACTIVE, |
| 788 | reprogram); |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 789 | return 1; |
| 790 | } |
| 791 | return 0; |
| 792 | } |
| 793 | |
| 794 | /** |
| 795 | * hrtimer_start - (re)start an relative timer on the current CPU |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 796 | * @timer: the timer to be added |
| 797 | * @tim: expiry time |
| 798 | * @mode: expiry mode: absolute (HRTIMER_ABS) or relative (HRTIMER_REL) |
| 799 | * |
| 800 | * Returns: |
| 801 | * 0 on success |
| 802 | * 1 when the timer was active |
| 803 | */ |
| 804 | int |
| 805 | hrtimer_start(struct hrtimer *timer, ktime_t tim, const enum hrtimer_mode mode) |
| 806 | { |
Thomas Gleixner | 3c8aa39 | 2007-02-16 01:27:50 -0800 | [diff] [blame] | 807 | struct hrtimer_clock_base *base, *new_base; |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 808 | unsigned long flags; |
| 809 | int ret; |
| 810 | |
| 811 | base = lock_hrtimer_base(timer, &flags); |
| 812 | |
| 813 | /* Remove an active timer from the queue: */ |
| 814 | ret = remove_hrtimer(timer, base); |
| 815 | |
| 816 | /* Switch the timer base, if necessary: */ |
| 817 | new_base = switch_hrtimer_base(timer, base); |
| 818 | |
Thomas Gleixner | c9cb2e3 | 2007-02-16 01:27:49 -0800 | [diff] [blame] | 819 | if (mode == HRTIMER_MODE_REL) { |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 820 | tim = ktime_add(tim, new_base->get_time()); |
Ingo Molnar | 06027bd | 2006-02-14 13:53:15 -0800 | [diff] [blame] | 821 | /* |
| 822 | * CONFIG_TIME_LOW_RES is a temporary way for architectures |
| 823 | * to signal that they simply return xtime in |
| 824 | * do_gettimeoffset(). In this case we want to round up by |
| 825 | * resolution when starting a relative timer, to avoid short |
| 826 | * timeouts. This will go away with the GTOD framework. |
| 827 | */ |
| 828 | #ifdef CONFIG_TIME_LOW_RES |
| 829 | tim = ktime_add(tim, base->resolution); |
| 830 | #endif |
| 831 | } |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 832 | timer->expires = tim; |
| 833 | |
Ingo Molnar | 82f67cd | 2007-02-16 01:28:13 -0800 | [diff] [blame] | 834 | timer_stats_hrtimer_set_start_info(timer); |
| 835 | |
Ingo Molnar | 935c631 | 2007-03-28 13:17:18 +0200 | [diff] [blame] | 836 | /* |
| 837 | * Only allow reprogramming if the new base is on this CPU. |
| 838 | * (it might still be on another CPU if the timer was pending) |
| 839 | */ |
| 840 | enqueue_hrtimer(timer, new_base, |
| 841 | new_base->cpu_base == &__get_cpu_var(hrtimer_bases)); |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 842 | |
| 843 | unlock_hrtimer_base(timer, &flags); |
| 844 | |
| 845 | return ret; |
| 846 | } |
Stephen Hemminger | 8d16b76 | 2006-05-30 21:26:09 -0700 | [diff] [blame] | 847 | EXPORT_SYMBOL_GPL(hrtimer_start); |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 848 | |
| 849 | /** |
| 850 | * hrtimer_try_to_cancel - try to deactivate a timer |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 851 | * @timer: hrtimer to stop |
| 852 | * |
| 853 | * Returns: |
| 854 | * 0 when the timer was not active |
| 855 | * 1 when the timer was active |
| 856 | * -1 when the timer is currently excuting the callback function and |
Randy Dunlap | fa9799e | 2006-06-25 05:49:15 -0700 | [diff] [blame] | 857 | * cannot be stopped |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 858 | */ |
| 859 | int hrtimer_try_to_cancel(struct hrtimer *timer) |
| 860 | { |
Thomas Gleixner | 3c8aa39 | 2007-02-16 01:27:50 -0800 | [diff] [blame] | 861 | struct hrtimer_clock_base *base; |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 862 | unsigned long flags; |
| 863 | int ret = -1; |
| 864 | |
| 865 | base = lock_hrtimer_base(timer, &flags); |
| 866 | |
Thomas Gleixner | 303e967 | 2007-02-16 01:27:51 -0800 | [diff] [blame] | 867 | if (!hrtimer_callback_running(timer)) |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 868 | ret = remove_hrtimer(timer, base); |
| 869 | |
| 870 | unlock_hrtimer_base(timer, &flags); |
| 871 | |
| 872 | return ret; |
| 873 | |
| 874 | } |
Stephen Hemminger | 8d16b76 | 2006-05-30 21:26:09 -0700 | [diff] [blame] | 875 | EXPORT_SYMBOL_GPL(hrtimer_try_to_cancel); |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 876 | |
| 877 | /** |
| 878 | * hrtimer_cancel - cancel a timer and wait for the handler to finish. |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 879 | * @timer: the timer to be cancelled |
| 880 | * |
| 881 | * Returns: |
| 882 | * 0 when the timer was not active |
| 883 | * 1 when the timer was active |
| 884 | */ |
| 885 | int hrtimer_cancel(struct hrtimer *timer) |
| 886 | { |
| 887 | for (;;) { |
| 888 | int ret = hrtimer_try_to_cancel(timer); |
| 889 | |
| 890 | if (ret >= 0) |
| 891 | return ret; |
Joe Korty | 5ef37b1 | 2006-04-10 22:54:13 -0700 | [diff] [blame] | 892 | cpu_relax(); |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 893 | } |
| 894 | } |
Stephen Hemminger | 8d16b76 | 2006-05-30 21:26:09 -0700 | [diff] [blame] | 895 | EXPORT_SYMBOL_GPL(hrtimer_cancel); |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 896 | |
| 897 | /** |
| 898 | * hrtimer_get_remaining - get remaining time for the timer |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 899 | * @timer: the timer to read |
| 900 | */ |
| 901 | ktime_t hrtimer_get_remaining(const struct hrtimer *timer) |
| 902 | { |
Thomas Gleixner | 3c8aa39 | 2007-02-16 01:27:50 -0800 | [diff] [blame] | 903 | struct hrtimer_clock_base *base; |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 904 | unsigned long flags; |
| 905 | ktime_t rem; |
| 906 | |
| 907 | base = lock_hrtimer_base(timer, &flags); |
Thomas Gleixner | 3c8aa39 | 2007-02-16 01:27:50 -0800 | [diff] [blame] | 908 | rem = ktime_sub(timer->expires, base->get_time()); |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 909 | unlock_hrtimer_base(timer, &flags); |
| 910 | |
| 911 | return rem; |
| 912 | } |
Stephen Hemminger | 8d16b76 | 2006-05-30 21:26:09 -0700 | [diff] [blame] | 913 | EXPORT_SYMBOL_GPL(hrtimer_get_remaining); |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 914 | |
Thomas Gleixner | fd064b9 | 2007-02-16 01:27:47 -0800 | [diff] [blame] | 915 | #if defined(CONFIG_NO_IDLE_HZ) || defined(CONFIG_NO_HZ) |
Tony Lindgren | 6923974 | 2006-03-06 15:42:45 -0800 | [diff] [blame] | 916 | /** |
| 917 | * hrtimer_get_next_event - get the time until next expiry event |
| 918 | * |
| 919 | * Returns the delta to the next expiry event or KTIME_MAX if no timer |
| 920 | * is pending. |
| 921 | */ |
| 922 | ktime_t hrtimer_get_next_event(void) |
| 923 | { |
Thomas Gleixner | 3c8aa39 | 2007-02-16 01:27:50 -0800 | [diff] [blame] | 924 | struct hrtimer_cpu_base *cpu_base = &__get_cpu_var(hrtimer_bases); |
| 925 | struct hrtimer_clock_base *base = cpu_base->clock_base; |
Tony Lindgren | 6923974 | 2006-03-06 15:42:45 -0800 | [diff] [blame] | 926 | ktime_t delta, mindelta = { .tv64 = KTIME_MAX }; |
| 927 | unsigned long flags; |
| 928 | int i; |
| 929 | |
Thomas Gleixner | 3c8aa39 | 2007-02-16 01:27:50 -0800 | [diff] [blame] | 930 | spin_lock_irqsave(&cpu_base->lock, flags); |
| 931 | |
Thomas Gleixner | 54cdfdb | 2007-02-16 01:28:11 -0800 | [diff] [blame] | 932 | if (!hrtimer_hres_active()) { |
| 933 | for (i = 0; i < HRTIMER_MAX_CLOCK_BASES; i++, base++) { |
| 934 | struct hrtimer *timer; |
Tony Lindgren | 6923974 | 2006-03-06 15:42:45 -0800 | [diff] [blame] | 935 | |
Thomas Gleixner | 54cdfdb | 2007-02-16 01:28:11 -0800 | [diff] [blame] | 936 | if (!base->first) |
| 937 | continue; |
Thomas Gleixner | 3c8aa39 | 2007-02-16 01:27:50 -0800 | [diff] [blame] | 938 | |
Thomas Gleixner | 54cdfdb | 2007-02-16 01:28:11 -0800 | [diff] [blame] | 939 | timer = rb_entry(base->first, struct hrtimer, node); |
| 940 | delta.tv64 = timer->expires.tv64; |
| 941 | delta = ktime_sub(delta, base->get_time()); |
| 942 | if (delta.tv64 < mindelta.tv64) |
| 943 | mindelta.tv64 = delta.tv64; |
| 944 | } |
Tony Lindgren | 6923974 | 2006-03-06 15:42:45 -0800 | [diff] [blame] | 945 | } |
Thomas Gleixner | 3c8aa39 | 2007-02-16 01:27:50 -0800 | [diff] [blame] | 946 | |
| 947 | spin_unlock_irqrestore(&cpu_base->lock, flags); |
| 948 | |
Tony Lindgren | 6923974 | 2006-03-06 15:42:45 -0800 | [diff] [blame] | 949 | if (mindelta.tv64 < 0) |
| 950 | mindelta.tv64 = 0; |
| 951 | return mindelta; |
| 952 | } |
| 953 | #endif |
| 954 | |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 955 | /** |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 956 | * hrtimer_init - initialize a timer to the given clock |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 957 | * @timer: the timer to be initialized |
| 958 | * @clock_id: the clock to be used |
George Anzinger | 7978672 | 2006-02-01 03:05:11 -0800 | [diff] [blame] | 959 | * @mode: timer mode abs/rel |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 960 | */ |
George Anzinger | 7978672 | 2006-02-01 03:05:11 -0800 | [diff] [blame] | 961 | void hrtimer_init(struct hrtimer *timer, clockid_t clock_id, |
| 962 | enum hrtimer_mode mode) |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 963 | { |
Thomas Gleixner | 3c8aa39 | 2007-02-16 01:27:50 -0800 | [diff] [blame] | 964 | struct hrtimer_cpu_base *cpu_base; |
George Anzinger | 7978672 | 2006-02-01 03:05:11 -0800 | [diff] [blame] | 965 | |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 966 | memset(timer, 0, sizeof(struct hrtimer)); |
George Anzinger | 7978672 | 2006-02-01 03:05:11 -0800 | [diff] [blame] | 967 | |
Thomas Gleixner | 3c8aa39 | 2007-02-16 01:27:50 -0800 | [diff] [blame] | 968 | cpu_base = &__raw_get_cpu_var(hrtimer_bases); |
George Anzinger | 7978672 | 2006-02-01 03:05:11 -0800 | [diff] [blame] | 969 | |
Thomas Gleixner | c9cb2e3 | 2007-02-16 01:27:49 -0800 | [diff] [blame] | 970 | if (clock_id == CLOCK_REALTIME && mode != HRTIMER_MODE_ABS) |
George Anzinger | 7978672 | 2006-02-01 03:05:11 -0800 | [diff] [blame] | 971 | clock_id = CLOCK_MONOTONIC; |
| 972 | |
Thomas Gleixner | 3c8aa39 | 2007-02-16 01:27:50 -0800 | [diff] [blame] | 973 | timer->base = &cpu_base->clock_base[clock_id]; |
Thomas Gleixner | 54cdfdb | 2007-02-16 01:28:11 -0800 | [diff] [blame] | 974 | hrtimer_init_timer_hres(timer); |
Ingo Molnar | 82f67cd | 2007-02-16 01:28:13 -0800 | [diff] [blame] | 975 | |
| 976 | #ifdef CONFIG_TIMER_STATS |
| 977 | timer->start_site = NULL; |
| 978 | timer->start_pid = -1; |
| 979 | memset(timer->start_comm, 0, TASK_COMM_LEN); |
| 980 | #endif |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 981 | } |
Stephen Hemminger | 8d16b76 | 2006-05-30 21:26:09 -0700 | [diff] [blame] | 982 | EXPORT_SYMBOL_GPL(hrtimer_init); |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 983 | |
| 984 | /** |
| 985 | * hrtimer_get_res - get the timer resolution for a clock |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 986 | * @which_clock: which clock to query |
| 987 | * @tp: pointer to timespec variable to store the resolution |
| 988 | * |
Robert P. J. Day | 72fd4a3 | 2007-02-10 01:45:59 -0800 | [diff] [blame] | 989 | * Store the resolution of the clock selected by @which_clock in the |
| 990 | * variable pointed to by @tp. |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 991 | */ |
| 992 | int hrtimer_get_res(const clockid_t which_clock, struct timespec *tp) |
| 993 | { |
Thomas Gleixner | 3c8aa39 | 2007-02-16 01:27:50 -0800 | [diff] [blame] | 994 | struct hrtimer_cpu_base *cpu_base; |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 995 | |
Thomas Gleixner | 3c8aa39 | 2007-02-16 01:27:50 -0800 | [diff] [blame] | 996 | cpu_base = &__raw_get_cpu_var(hrtimer_bases); |
| 997 | *tp = ktime_to_timespec(cpu_base->clock_base[which_clock].resolution); |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 998 | |
| 999 | return 0; |
| 1000 | } |
Stephen Hemminger | 8d16b76 | 2006-05-30 21:26:09 -0700 | [diff] [blame] | 1001 | EXPORT_SYMBOL_GPL(hrtimer_get_res); |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 1002 | |
Thomas Gleixner | 54cdfdb | 2007-02-16 01:28:11 -0800 | [diff] [blame] | 1003 | #ifdef CONFIG_HIGH_RES_TIMERS |
| 1004 | |
| 1005 | /* |
| 1006 | * High resolution timer interrupt |
| 1007 | * Called with interrupts disabled |
| 1008 | */ |
| 1009 | void hrtimer_interrupt(struct clock_event_device *dev) |
| 1010 | { |
| 1011 | struct hrtimer_cpu_base *cpu_base = &__get_cpu_var(hrtimer_bases); |
| 1012 | struct hrtimer_clock_base *base; |
| 1013 | ktime_t expires_next, now; |
| 1014 | int i, raise = 0; |
| 1015 | |
| 1016 | BUG_ON(!cpu_base->hres_active); |
| 1017 | cpu_base->nr_events++; |
| 1018 | dev->next_event.tv64 = KTIME_MAX; |
| 1019 | |
| 1020 | retry: |
| 1021 | now = ktime_get(); |
| 1022 | |
| 1023 | expires_next.tv64 = KTIME_MAX; |
| 1024 | |
| 1025 | base = cpu_base->clock_base; |
| 1026 | |
| 1027 | for (i = 0; i < HRTIMER_MAX_CLOCK_BASES; i++) { |
| 1028 | ktime_t basenow; |
| 1029 | struct rb_node *node; |
| 1030 | |
| 1031 | spin_lock(&cpu_base->lock); |
| 1032 | |
| 1033 | basenow = ktime_add(now, base->offset); |
| 1034 | |
| 1035 | while ((node = base->first)) { |
| 1036 | struct hrtimer *timer; |
| 1037 | |
| 1038 | timer = rb_entry(node, struct hrtimer, node); |
| 1039 | |
| 1040 | if (basenow.tv64 < timer->expires.tv64) { |
| 1041 | ktime_t expires; |
| 1042 | |
| 1043 | expires = ktime_sub(timer->expires, |
| 1044 | base->offset); |
| 1045 | if (expires.tv64 < expires_next.tv64) |
| 1046 | expires_next = expires; |
| 1047 | break; |
| 1048 | } |
| 1049 | |
| 1050 | /* Move softirq callbacks to the pending list */ |
| 1051 | if (timer->cb_mode == HRTIMER_CB_SOFTIRQ) { |
| 1052 | __remove_hrtimer(timer, base, |
| 1053 | HRTIMER_STATE_PENDING, 0); |
| 1054 | list_add_tail(&timer->cb_entry, |
| 1055 | &base->cpu_base->cb_pending); |
| 1056 | raise = 1; |
| 1057 | continue; |
| 1058 | } |
| 1059 | |
| 1060 | __remove_hrtimer(timer, base, |
| 1061 | HRTIMER_STATE_CALLBACK, 0); |
Ingo Molnar | 82f67cd | 2007-02-16 01:28:13 -0800 | [diff] [blame] | 1062 | timer_stats_account_hrtimer(timer); |
Thomas Gleixner | 54cdfdb | 2007-02-16 01:28:11 -0800 | [diff] [blame] | 1063 | |
| 1064 | /* |
| 1065 | * Note: We clear the CALLBACK bit after |
| 1066 | * enqueue_hrtimer to avoid reprogramming of |
| 1067 | * the event hardware. This happens at the end |
| 1068 | * of this function anyway. |
| 1069 | */ |
| 1070 | if (timer->function(timer) != HRTIMER_NORESTART) { |
| 1071 | BUG_ON(timer->state != HRTIMER_STATE_CALLBACK); |
| 1072 | enqueue_hrtimer(timer, base, 0); |
| 1073 | } |
| 1074 | timer->state &= ~HRTIMER_STATE_CALLBACK; |
| 1075 | } |
| 1076 | spin_unlock(&cpu_base->lock); |
| 1077 | base++; |
| 1078 | } |
| 1079 | |
| 1080 | cpu_base->expires_next = expires_next; |
| 1081 | |
| 1082 | /* Reprogramming necessary ? */ |
| 1083 | if (expires_next.tv64 != KTIME_MAX) { |
| 1084 | if (tick_program_event(expires_next, 0)) |
| 1085 | goto retry; |
| 1086 | } |
| 1087 | |
| 1088 | /* Raise softirq ? */ |
| 1089 | if (raise) |
| 1090 | raise_softirq(HRTIMER_SOFTIRQ); |
| 1091 | } |
| 1092 | |
| 1093 | static void run_hrtimer_softirq(struct softirq_action *h) |
| 1094 | { |
| 1095 | struct hrtimer_cpu_base *cpu_base = &__get_cpu_var(hrtimer_bases); |
| 1096 | |
| 1097 | spin_lock_irq(&cpu_base->lock); |
| 1098 | |
| 1099 | while (!list_empty(&cpu_base->cb_pending)) { |
| 1100 | enum hrtimer_restart (*fn)(struct hrtimer *); |
| 1101 | struct hrtimer *timer; |
| 1102 | int restart; |
| 1103 | |
| 1104 | timer = list_entry(cpu_base->cb_pending.next, |
| 1105 | struct hrtimer, cb_entry); |
| 1106 | |
Ingo Molnar | 82f67cd | 2007-02-16 01:28:13 -0800 | [diff] [blame] | 1107 | timer_stats_account_hrtimer(timer); |
| 1108 | |
Thomas Gleixner | 54cdfdb | 2007-02-16 01:28:11 -0800 | [diff] [blame] | 1109 | fn = timer->function; |
| 1110 | __remove_hrtimer(timer, timer->base, HRTIMER_STATE_CALLBACK, 0); |
| 1111 | spin_unlock_irq(&cpu_base->lock); |
| 1112 | |
| 1113 | restart = fn(timer); |
| 1114 | |
| 1115 | spin_lock_irq(&cpu_base->lock); |
| 1116 | |
| 1117 | timer->state &= ~HRTIMER_STATE_CALLBACK; |
| 1118 | if (restart == HRTIMER_RESTART) { |
| 1119 | BUG_ON(hrtimer_active(timer)); |
| 1120 | /* |
| 1121 | * Enqueue the timer, allow reprogramming of the event |
| 1122 | * device |
| 1123 | */ |
| 1124 | enqueue_hrtimer(timer, timer->base, 1); |
| 1125 | } else if (hrtimer_active(timer)) { |
| 1126 | /* |
| 1127 | * If the timer was rearmed on another CPU, reprogram |
| 1128 | * the event device. |
| 1129 | */ |
| 1130 | if (timer->base->first == &timer->node) |
| 1131 | hrtimer_reprogram(timer, timer->base); |
| 1132 | } |
| 1133 | } |
| 1134 | spin_unlock_irq(&cpu_base->lock); |
| 1135 | } |
| 1136 | |
| 1137 | #endif /* CONFIG_HIGH_RES_TIMERS */ |
| 1138 | |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 1139 | /* |
| 1140 | * Expire the per base hrtimer-queue: |
| 1141 | */ |
Thomas Gleixner | 3c8aa39 | 2007-02-16 01:27:50 -0800 | [diff] [blame] | 1142 | static inline void run_hrtimer_queue(struct hrtimer_cpu_base *cpu_base, |
| 1143 | int index) |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 1144 | { |
Thomas Gleixner | 288867e | 2006-01-12 11:25:54 +0100 | [diff] [blame] | 1145 | struct rb_node *node; |
Thomas Gleixner | 3c8aa39 | 2007-02-16 01:27:50 -0800 | [diff] [blame] | 1146 | struct hrtimer_clock_base *base = &cpu_base->clock_base[index]; |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 1147 | |
Dimitri Sivanich | 3055add | 2006-03-31 02:31:20 -0800 | [diff] [blame] | 1148 | if (!base->first) |
| 1149 | return; |
| 1150 | |
Thomas Gleixner | 92127c7 | 2006-03-26 01:38:05 -0800 | [diff] [blame] | 1151 | if (base->get_softirq_time) |
| 1152 | base->softirq_time = base->get_softirq_time(); |
| 1153 | |
Thomas Gleixner | 3c8aa39 | 2007-02-16 01:27:50 -0800 | [diff] [blame] | 1154 | spin_lock_irq(&cpu_base->lock); |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 1155 | |
Thomas Gleixner | 288867e | 2006-01-12 11:25:54 +0100 | [diff] [blame] | 1156 | while ((node = base->first)) { |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 1157 | struct hrtimer *timer; |
Thomas Gleixner | c9cb2e3 | 2007-02-16 01:27:49 -0800 | [diff] [blame] | 1158 | enum hrtimer_restart (*fn)(struct hrtimer *); |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 1159 | int restart; |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 1160 | |
Thomas Gleixner | 288867e | 2006-01-12 11:25:54 +0100 | [diff] [blame] | 1161 | timer = rb_entry(node, struct hrtimer, node); |
Thomas Gleixner | 92127c7 | 2006-03-26 01:38:05 -0800 | [diff] [blame] | 1162 | if (base->softirq_time.tv64 <= timer->expires.tv64) |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 1163 | break; |
| 1164 | |
Thomas Gleixner | f895385 | 2007-03-06 01:42:08 -0800 | [diff] [blame] | 1165 | #ifdef CONFIG_HIGH_RES_TIMERS |
| 1166 | WARN_ON_ONCE(timer->cb_mode == HRTIMER_CB_IRQSAFE_NO_SOFTIRQ); |
| 1167 | #endif |
Ingo Molnar | 82f67cd | 2007-02-16 01:28:13 -0800 | [diff] [blame] | 1168 | timer_stats_account_hrtimer(timer); |
| 1169 | |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 1170 | fn = timer->function; |
Thomas Gleixner | 54cdfdb | 2007-02-16 01:28:11 -0800 | [diff] [blame] | 1171 | __remove_hrtimer(timer, base, HRTIMER_STATE_CALLBACK, 0); |
Thomas Gleixner | 3c8aa39 | 2007-02-16 01:27:50 -0800 | [diff] [blame] | 1172 | spin_unlock_irq(&cpu_base->lock); |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 1173 | |
Roman Zippel | 05cfb61 | 2006-03-26 01:38:12 -0800 | [diff] [blame] | 1174 | restart = fn(timer); |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 1175 | |
Thomas Gleixner | 3c8aa39 | 2007-02-16 01:27:50 -0800 | [diff] [blame] | 1176 | spin_lock_irq(&cpu_base->lock); |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 1177 | |
Thomas Gleixner | 303e967 | 2007-02-16 01:27:51 -0800 | [diff] [blame] | 1178 | timer->state &= ~HRTIMER_STATE_CALLBACK; |
Roman Zippel | b75f7a5 | 2006-03-26 01:38:09 -0800 | [diff] [blame] | 1179 | if (restart != HRTIMER_NORESTART) { |
| 1180 | BUG_ON(hrtimer_active(timer)); |
Thomas Gleixner | 54cdfdb | 2007-02-16 01:28:11 -0800 | [diff] [blame] | 1181 | enqueue_hrtimer(timer, base, 0); |
Roman Zippel | b75f7a5 | 2006-03-26 01:38:09 -0800 | [diff] [blame] | 1182 | } |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 1183 | } |
Thomas Gleixner | 3c8aa39 | 2007-02-16 01:27:50 -0800 | [diff] [blame] | 1184 | spin_unlock_irq(&cpu_base->lock); |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 1185 | } |
| 1186 | |
| 1187 | /* |
| 1188 | * Called from timer softirq every jiffy, expire hrtimers: |
Thomas Gleixner | 54cdfdb | 2007-02-16 01:28:11 -0800 | [diff] [blame] | 1189 | * |
| 1190 | * For HRT its the fall back code to run the softirq in the timer |
| 1191 | * softirq context in case the hrtimer initialization failed or has |
| 1192 | * not been done yet. |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 1193 | */ |
| 1194 | void hrtimer_run_queues(void) |
| 1195 | { |
Thomas Gleixner | 3c8aa39 | 2007-02-16 01:27:50 -0800 | [diff] [blame] | 1196 | struct hrtimer_cpu_base *cpu_base = &__get_cpu_var(hrtimer_bases); |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 1197 | int i; |
| 1198 | |
Thomas Gleixner | 54cdfdb | 2007-02-16 01:28:11 -0800 | [diff] [blame] | 1199 | if (hrtimer_hres_active()) |
| 1200 | return; |
| 1201 | |
Thomas Gleixner | 79bf2bb | 2007-02-16 01:28:03 -0800 | [diff] [blame] | 1202 | /* |
| 1203 | * This _is_ ugly: We have to check in the softirq context, |
| 1204 | * whether we can switch to highres and / or nohz mode. The |
| 1205 | * clocksource switch happens in the timer interrupt with |
| 1206 | * xtime_lock held. Notification from there only sets the |
| 1207 | * check bit in the tick_oneshot code, otherwise we might |
| 1208 | * deadlock vs. xtime_lock. |
| 1209 | */ |
Thomas Gleixner | 54cdfdb | 2007-02-16 01:28:11 -0800 | [diff] [blame] | 1210 | if (tick_check_oneshot_change(!hrtimer_is_hres_enabled())) |
Thomas Gleixner | f895385 | 2007-03-06 01:42:08 -0800 | [diff] [blame] | 1211 | if (hrtimer_switch_to_hres()) |
| 1212 | return; |
Thomas Gleixner | 79bf2bb | 2007-02-16 01:28:03 -0800 | [diff] [blame] | 1213 | |
Thomas Gleixner | 3c8aa39 | 2007-02-16 01:27:50 -0800 | [diff] [blame] | 1214 | hrtimer_get_softirq_time(cpu_base); |
Thomas Gleixner | 92127c7 | 2006-03-26 01:38:05 -0800 | [diff] [blame] | 1215 | |
Thomas Gleixner | 3c8aa39 | 2007-02-16 01:27:50 -0800 | [diff] [blame] | 1216 | for (i = 0; i < HRTIMER_MAX_CLOCK_BASES; i++) |
| 1217 | run_hrtimer_queue(cpu_base, i); |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 1218 | } |
| 1219 | |
| 1220 | /* |
Thomas Gleixner | 10c94ec | 2006-01-09 20:52:35 -0800 | [diff] [blame] | 1221 | * Sleep related functions: |
| 1222 | */ |
Thomas Gleixner | c9cb2e3 | 2007-02-16 01:27:49 -0800 | [diff] [blame] | 1223 | static enum hrtimer_restart hrtimer_wakeup(struct hrtimer *timer) |
Thomas Gleixner | 00362e3 | 2006-03-31 02:31:17 -0800 | [diff] [blame] | 1224 | { |
| 1225 | struct hrtimer_sleeper *t = |
| 1226 | container_of(timer, struct hrtimer_sleeper, timer); |
| 1227 | struct task_struct *task = t->task; |
| 1228 | |
| 1229 | t->task = NULL; |
| 1230 | if (task) |
| 1231 | wake_up_process(task); |
| 1232 | |
| 1233 | return HRTIMER_NORESTART; |
| 1234 | } |
| 1235 | |
Ingo Molnar | 36c8b58 | 2006-07-03 00:25:41 -0700 | [diff] [blame] | 1236 | void hrtimer_init_sleeper(struct hrtimer_sleeper *sl, struct task_struct *task) |
Thomas Gleixner | 00362e3 | 2006-03-31 02:31:17 -0800 | [diff] [blame] | 1237 | { |
| 1238 | sl->timer.function = hrtimer_wakeup; |
| 1239 | sl->task = task; |
Thomas Gleixner | 54cdfdb | 2007-02-16 01:28:11 -0800 | [diff] [blame] | 1240 | #ifdef CONFIG_HIGH_RES_TIMERS |
| 1241 | sl->timer.cb_mode = HRTIMER_CB_IRQSAFE_NO_RESTART; |
| 1242 | #endif |
Thomas Gleixner | 00362e3 | 2006-03-31 02:31:17 -0800 | [diff] [blame] | 1243 | } |
| 1244 | |
Thomas Gleixner | 669d786 | 2006-03-31 02:31:19 -0800 | [diff] [blame] | 1245 | static int __sched do_nanosleep(struct hrtimer_sleeper *t, enum hrtimer_mode mode) |
Thomas Gleixner | 10c94ec | 2006-01-09 20:52:35 -0800 | [diff] [blame] | 1246 | { |
Thomas Gleixner | 669d786 | 2006-03-31 02:31:19 -0800 | [diff] [blame] | 1247 | hrtimer_init_sleeper(t, current); |
Thomas Gleixner | 10c94ec | 2006-01-09 20:52:35 -0800 | [diff] [blame] | 1248 | |
Roman Zippel | 432569b | 2006-03-26 01:38:08 -0800 | [diff] [blame] | 1249 | do { |
| 1250 | set_current_state(TASK_INTERRUPTIBLE); |
| 1251 | hrtimer_start(&t->timer, t->timer.expires, mode); |
| 1252 | |
Thomas Gleixner | 54cdfdb | 2007-02-16 01:28:11 -0800 | [diff] [blame] | 1253 | if (likely(t->task)) |
| 1254 | schedule(); |
Roman Zippel | 432569b | 2006-03-26 01:38:08 -0800 | [diff] [blame] | 1255 | |
Thomas Gleixner | 669d786 | 2006-03-31 02:31:19 -0800 | [diff] [blame] | 1256 | hrtimer_cancel(&t->timer); |
Thomas Gleixner | c9cb2e3 | 2007-02-16 01:27:49 -0800 | [diff] [blame] | 1257 | mode = HRTIMER_MODE_ABS; |
Roman Zippel | 432569b | 2006-03-26 01:38:08 -0800 | [diff] [blame] | 1258 | |
Thomas Gleixner | 669d786 | 2006-03-31 02:31:19 -0800 | [diff] [blame] | 1259 | } while (t->task && !signal_pending(current)); |
| 1260 | |
| 1261 | return t->task == NULL; |
Thomas Gleixner | 10c94ec | 2006-01-09 20:52:35 -0800 | [diff] [blame] | 1262 | } |
| 1263 | |
Toyo Abe | 1711ef3 | 2006-09-29 02:00:28 -0700 | [diff] [blame] | 1264 | long __sched hrtimer_nanosleep_restart(struct restart_block *restart) |
Thomas Gleixner | 10c94ec | 2006-01-09 20:52:35 -0800 | [diff] [blame] | 1265 | { |
Thomas Gleixner | 669d786 | 2006-03-31 02:31:19 -0800 | [diff] [blame] | 1266 | struct hrtimer_sleeper t; |
Ingo Molnar | ea13dbc | 2006-01-16 10:59:41 +0100 | [diff] [blame] | 1267 | struct timespec __user *rmtp; |
| 1268 | struct timespec tu; |
Roman Zippel | 432569b | 2006-03-26 01:38:08 -0800 | [diff] [blame] | 1269 | ktime_t time; |
Thomas Gleixner | 10c94ec | 2006-01-09 20:52:35 -0800 | [diff] [blame] | 1270 | |
| 1271 | restart->fn = do_no_restart_syscall; |
| 1272 | |
Thomas Gleixner | c9cb2e3 | 2007-02-16 01:27:49 -0800 | [diff] [blame] | 1273 | hrtimer_init(&t.timer, restart->arg0, HRTIMER_MODE_ABS); |
Toyo Abe | 1711ef3 | 2006-09-29 02:00:28 -0700 | [diff] [blame] | 1274 | t.timer.expires.tv64 = ((u64)restart->arg3 << 32) | (u64) restart->arg2; |
Thomas Gleixner | 10c94ec | 2006-01-09 20:52:35 -0800 | [diff] [blame] | 1275 | |
Thomas Gleixner | c9cb2e3 | 2007-02-16 01:27:49 -0800 | [diff] [blame] | 1276 | if (do_nanosleep(&t, HRTIMER_MODE_ABS)) |
Thomas Gleixner | 10c94ec | 2006-01-09 20:52:35 -0800 | [diff] [blame] | 1277 | return 0; |
| 1278 | |
Toyo Abe | 1711ef3 | 2006-09-29 02:00:28 -0700 | [diff] [blame] | 1279 | rmtp = (struct timespec __user *) restart->arg1; |
Roman Zippel | 432569b | 2006-03-26 01:38:08 -0800 | [diff] [blame] | 1280 | if (rmtp) { |
| 1281 | time = ktime_sub(t.timer.expires, t.timer.base->get_time()); |
| 1282 | if (time.tv64 <= 0) |
| 1283 | return 0; |
| 1284 | tu = ktime_to_timespec(time); |
| 1285 | if (copy_to_user(rmtp, &tu, sizeof(tu))) |
| 1286 | return -EFAULT; |
| 1287 | } |
Thomas Gleixner | 10c94ec | 2006-01-09 20:52:35 -0800 | [diff] [blame] | 1288 | |
Toyo Abe | 1711ef3 | 2006-09-29 02:00:28 -0700 | [diff] [blame] | 1289 | restart->fn = hrtimer_nanosleep_restart; |
Thomas Gleixner | 10c94ec | 2006-01-09 20:52:35 -0800 | [diff] [blame] | 1290 | |
| 1291 | /* The other values in restart are already filled in */ |
| 1292 | return -ERESTART_RESTARTBLOCK; |
| 1293 | } |
| 1294 | |
Thomas Gleixner | 10c94ec | 2006-01-09 20:52:35 -0800 | [diff] [blame] | 1295 | long hrtimer_nanosleep(struct timespec *rqtp, struct timespec __user *rmtp, |
| 1296 | const enum hrtimer_mode mode, const clockid_t clockid) |
| 1297 | { |
| 1298 | struct restart_block *restart; |
Thomas Gleixner | 669d786 | 2006-03-31 02:31:19 -0800 | [diff] [blame] | 1299 | struct hrtimer_sleeper t; |
Thomas Gleixner | 10c94ec | 2006-01-09 20:52:35 -0800 | [diff] [blame] | 1300 | struct timespec tu; |
| 1301 | ktime_t rem; |
| 1302 | |
Roman Zippel | 432569b | 2006-03-26 01:38:08 -0800 | [diff] [blame] | 1303 | hrtimer_init(&t.timer, clockid, mode); |
| 1304 | t.timer.expires = timespec_to_ktime(*rqtp); |
| 1305 | if (do_nanosleep(&t, mode)) |
Thomas Gleixner | 10c94ec | 2006-01-09 20:52:35 -0800 | [diff] [blame] | 1306 | return 0; |
| 1307 | |
George Anzinger | 7978672 | 2006-02-01 03:05:11 -0800 | [diff] [blame] | 1308 | /* Absolute timers do not update the rmtp value and restart: */ |
Thomas Gleixner | c9cb2e3 | 2007-02-16 01:27:49 -0800 | [diff] [blame] | 1309 | if (mode == HRTIMER_MODE_ABS) |
Thomas Gleixner | 10c94ec | 2006-01-09 20:52:35 -0800 | [diff] [blame] | 1310 | return -ERESTARTNOHAND; |
| 1311 | |
Roman Zippel | 432569b | 2006-03-26 01:38:08 -0800 | [diff] [blame] | 1312 | if (rmtp) { |
| 1313 | rem = ktime_sub(t.timer.expires, t.timer.base->get_time()); |
| 1314 | if (rem.tv64 <= 0) |
| 1315 | return 0; |
| 1316 | tu = ktime_to_timespec(rem); |
| 1317 | if (copy_to_user(rmtp, &tu, sizeof(tu))) |
| 1318 | return -EFAULT; |
| 1319 | } |
Thomas Gleixner | 10c94ec | 2006-01-09 20:52:35 -0800 | [diff] [blame] | 1320 | |
| 1321 | restart = ¤t_thread_info()->restart_block; |
Toyo Abe | 1711ef3 | 2006-09-29 02:00:28 -0700 | [diff] [blame] | 1322 | restart->fn = hrtimer_nanosleep_restart; |
| 1323 | restart->arg0 = (unsigned long) t.timer.base->index; |
| 1324 | restart->arg1 = (unsigned long) rmtp; |
| 1325 | restart->arg2 = t.timer.expires.tv64 & 0xFFFFFFFF; |
| 1326 | restart->arg3 = t.timer.expires.tv64 >> 32; |
Thomas Gleixner | 10c94ec | 2006-01-09 20:52:35 -0800 | [diff] [blame] | 1327 | |
| 1328 | return -ERESTART_RESTARTBLOCK; |
| 1329 | } |
| 1330 | |
Thomas Gleixner | 6ba1b91 | 2006-01-09 20:52:36 -0800 | [diff] [blame] | 1331 | asmlinkage long |
| 1332 | sys_nanosleep(struct timespec __user *rqtp, struct timespec __user *rmtp) |
| 1333 | { |
| 1334 | struct timespec tu; |
| 1335 | |
| 1336 | if (copy_from_user(&tu, rqtp, sizeof(tu))) |
| 1337 | return -EFAULT; |
| 1338 | |
| 1339 | if (!timespec_valid(&tu)) |
| 1340 | return -EINVAL; |
| 1341 | |
Thomas Gleixner | c9cb2e3 | 2007-02-16 01:27:49 -0800 | [diff] [blame] | 1342 | return hrtimer_nanosleep(&tu, rmtp, HRTIMER_MODE_REL, CLOCK_MONOTONIC); |
Thomas Gleixner | 6ba1b91 | 2006-01-09 20:52:36 -0800 | [diff] [blame] | 1343 | } |
| 1344 | |
Thomas Gleixner | 10c94ec | 2006-01-09 20:52:35 -0800 | [diff] [blame] | 1345 | /* |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 1346 | * Functions related to boot-time initialization: |
| 1347 | */ |
| 1348 | static void __devinit init_hrtimers_cpu(int cpu) |
| 1349 | { |
Thomas Gleixner | 3c8aa39 | 2007-02-16 01:27:50 -0800 | [diff] [blame] | 1350 | struct hrtimer_cpu_base *cpu_base = &per_cpu(hrtimer_bases, cpu); |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 1351 | int i; |
| 1352 | |
Thomas Gleixner | 3c8aa39 | 2007-02-16 01:27:50 -0800 | [diff] [blame] | 1353 | spin_lock_init(&cpu_base->lock); |
| 1354 | lockdep_set_class(&cpu_base->lock, &cpu_base->lock_key); |
| 1355 | |
| 1356 | for (i = 0; i < HRTIMER_MAX_CLOCK_BASES; i++) |
| 1357 | cpu_base->clock_base[i].cpu_base = cpu_base; |
| 1358 | |
Thomas Gleixner | 54cdfdb | 2007-02-16 01:28:11 -0800 | [diff] [blame] | 1359 | hrtimer_init_hres(cpu_base); |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 1360 | } |
| 1361 | |
| 1362 | #ifdef CONFIG_HOTPLUG_CPU |
| 1363 | |
Thomas Gleixner | 3c8aa39 | 2007-02-16 01:27:50 -0800 | [diff] [blame] | 1364 | static void migrate_hrtimer_list(struct hrtimer_clock_base *old_base, |
| 1365 | struct hrtimer_clock_base *new_base) |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 1366 | { |
| 1367 | struct hrtimer *timer; |
| 1368 | struct rb_node *node; |
| 1369 | |
| 1370 | while ((node = rb_first(&old_base->active))) { |
| 1371 | timer = rb_entry(node, struct hrtimer, node); |
Thomas Gleixner | 54cdfdb | 2007-02-16 01:28:11 -0800 | [diff] [blame] | 1372 | BUG_ON(hrtimer_callback_running(timer)); |
| 1373 | __remove_hrtimer(timer, old_base, HRTIMER_STATE_INACTIVE, 0); |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 1374 | timer->base = new_base; |
Thomas Gleixner | 54cdfdb | 2007-02-16 01:28:11 -0800 | [diff] [blame] | 1375 | /* |
| 1376 | * Enqueue the timer. Allow reprogramming of the event device |
| 1377 | */ |
| 1378 | enqueue_hrtimer(timer, new_base, 1); |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 1379 | } |
| 1380 | } |
| 1381 | |
| 1382 | static void migrate_hrtimers(int cpu) |
| 1383 | { |
Thomas Gleixner | 3c8aa39 | 2007-02-16 01:27:50 -0800 | [diff] [blame] | 1384 | struct hrtimer_cpu_base *old_base, *new_base; |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 1385 | int i; |
| 1386 | |
| 1387 | BUG_ON(cpu_online(cpu)); |
Thomas Gleixner | 3c8aa39 | 2007-02-16 01:27:50 -0800 | [diff] [blame] | 1388 | old_base = &per_cpu(hrtimer_bases, cpu); |
| 1389 | new_base = &get_cpu_var(hrtimer_bases); |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 1390 | |
Thomas Gleixner | 54cdfdb | 2007-02-16 01:28:11 -0800 | [diff] [blame] | 1391 | tick_cancel_sched_timer(cpu); |
| 1392 | |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 1393 | local_irq_disable(); |
Heiko Carstens | e81ce1f | 2007-03-05 00:30:51 -0800 | [diff] [blame] | 1394 | double_spin_lock(&new_base->lock, &old_base->lock, |
| 1395 | smp_processor_id() < cpu); |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 1396 | |
Thomas Gleixner | 3c8aa39 | 2007-02-16 01:27:50 -0800 | [diff] [blame] | 1397 | for (i = 0; i < HRTIMER_MAX_CLOCK_BASES; i++) { |
Thomas Gleixner | 3c8aa39 | 2007-02-16 01:27:50 -0800 | [diff] [blame] | 1398 | migrate_hrtimer_list(&old_base->clock_base[i], |
| 1399 | &new_base->clock_base[i]); |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 1400 | } |
| 1401 | |
Heiko Carstens | e81ce1f | 2007-03-05 00:30:51 -0800 | [diff] [blame] | 1402 | double_spin_unlock(&new_base->lock, &old_base->lock, |
| 1403 | smp_processor_id() < cpu); |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 1404 | local_irq_enable(); |
| 1405 | put_cpu_var(hrtimer_bases); |
| 1406 | } |
| 1407 | #endif /* CONFIG_HOTPLUG_CPU */ |
| 1408 | |
Chandra Seetharaman | 8c78f30 | 2006-07-30 03:03:35 -0700 | [diff] [blame] | 1409 | static int __cpuinit hrtimer_cpu_notify(struct notifier_block *self, |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 1410 | unsigned long action, void *hcpu) |
| 1411 | { |
David Miller | 7713a7d | 2007-07-16 17:17:44 -0700 | [diff] [blame] | 1412 | unsigned int cpu = (long)hcpu; |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 1413 | |
| 1414 | switch (action) { |
| 1415 | |
| 1416 | case CPU_UP_PREPARE: |
Rafael J. Wysocki | 8bb7844 | 2007-05-09 02:35:10 -0700 | [diff] [blame] | 1417 | case CPU_UP_PREPARE_FROZEN: |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 1418 | init_hrtimers_cpu(cpu); |
| 1419 | break; |
| 1420 | |
| 1421 | #ifdef CONFIG_HOTPLUG_CPU |
| 1422 | case CPU_DEAD: |
Rafael J. Wysocki | 8bb7844 | 2007-05-09 02:35:10 -0700 | [diff] [blame] | 1423 | case CPU_DEAD_FROZEN: |
Thomas Gleixner | d316c57 | 2007-02-16 01:28:00 -0800 | [diff] [blame] | 1424 | clockevents_notify(CLOCK_EVT_NOTIFY_CPU_DEAD, &cpu); |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 1425 | migrate_hrtimers(cpu); |
| 1426 | break; |
| 1427 | #endif |
| 1428 | |
| 1429 | default: |
| 1430 | break; |
| 1431 | } |
| 1432 | |
| 1433 | return NOTIFY_OK; |
| 1434 | } |
| 1435 | |
Chandra Seetharaman | 8c78f30 | 2006-07-30 03:03:35 -0700 | [diff] [blame] | 1436 | static struct notifier_block __cpuinitdata hrtimers_nb = { |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 1437 | .notifier_call = hrtimer_cpu_notify, |
| 1438 | }; |
| 1439 | |
| 1440 | void __init hrtimers_init(void) |
| 1441 | { |
| 1442 | hrtimer_cpu_notify(&hrtimers_nb, (unsigned long)CPU_UP_PREPARE, |
| 1443 | (void *)(long)smp_processor_id()); |
| 1444 | register_cpu_notifier(&hrtimers_nb); |
Thomas Gleixner | 54cdfdb | 2007-02-16 01:28:11 -0800 | [diff] [blame] | 1445 | #ifdef CONFIG_HIGH_RES_TIMERS |
| 1446 | open_softirq(HRTIMER_SOFTIRQ, run_hrtimer_softirq, NULL); |
| 1447 | #endif |
Thomas Gleixner | c0a3132 | 2006-01-09 20:52:32 -0800 | [diff] [blame] | 1448 | } |
| 1449 | |