David Turner | 6a9ef17 | 2010-09-09 22:54:36 +0200 | [diff] [blame] | 1 | /* |
| 2 | * QEMU System Emulator |
| 3 | * |
| 4 | * Copyright (c) 2003-2008 Fabrice Bellard |
| 5 | * |
| 6 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
| 7 | * of this software and associated documentation files (the "Software"), to deal |
| 8 | * in the Software without restriction, including without limitation the rights |
| 9 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
| 10 | * copies of the Software, and to permit persons to whom the Software is |
| 11 | * furnished to do so, subject to the following conditions: |
| 12 | * |
| 13 | * The above copyright notice and this permission notice shall be included in |
| 14 | * all copies or substantial portions of the Software. |
| 15 | * |
| 16 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| 17 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| 18 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
| 19 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| 20 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| 21 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
| 22 | * THE SOFTWARE. |
| 23 | */ |
| 24 | |
David 'Digit' Turner | 34c48ff | 2013-12-15 00:25:03 +0100 | [diff] [blame] | 25 | #include "sysemu/sysemu.h" |
David 'Digit' Turner | 6af6765 | 2013-12-14 23:49:32 +0100 | [diff] [blame] | 26 | #include "monitor/monitor.h" |
David 'Digit' Turner | 1c31e3e | 2013-12-14 20:07:17 +0100 | [diff] [blame] | 27 | #include "ui/console.h" |
David Turner | 6a9ef17 | 2010-09-09 22:54:36 +0200 | [diff] [blame] | 28 | |
| 29 | #include "hw/hw.h" |
| 30 | |
David 'Digit' Turner | dcda949 | 2014-02-16 15:13:55 +0100 | [diff] [blame] | 31 | #include "qemu/thread.h" |
| 32 | #include "qemu/timer.h" |
| 33 | #ifdef CONFIG_POSIX |
| 34 | #include <pthread.h> |
David Turner | 6a9ef17 | 2010-09-09 22:54:36 +0200 | [diff] [blame] | 35 | #endif |
| 36 | |
David 'Digit' Turner | dcda949 | 2014-02-16 15:13:55 +0100 | [diff] [blame] | 37 | #ifdef CONFIG_PPOLL |
| 38 | #include <poll.h> |
| 39 | #endif |
| 40 | |
| 41 | #ifdef CONFIG_PRCTL_PR_SET_TIMERSLACK |
| 42 | #include <sys/prctl.h> |
| 43 | #endif |
David Turner | 6a9ef17 | 2010-09-09 22:54:36 +0200 | [diff] [blame] | 44 | |
David Turner | 6a9ef17 | 2010-09-09 22:54:36 +0200 | [diff] [blame] | 45 | /***********************************************************/ |
David Turner | 6a9ef17 | 2010-09-09 22:54:36 +0200 | [diff] [blame] | 46 | /* timers */ |
| 47 | |
David 'Digit' Turner | dcda949 | 2014-02-16 15:13:55 +0100 | [diff] [blame] | 48 | typedef struct QEMUClock { |
| 49 | /* We rely on BQL to protect the timerlists */ |
| 50 | QLIST_HEAD(, QEMUTimerList) timerlists; |
David 'Digit' Turner | 317c9d5 | 2011-05-10 06:38:21 +0200 | [diff] [blame] | 51 | |
David 'Digit' Turner | dcda949 | 2014-02-16 15:13:55 +0100 | [diff] [blame] | 52 | NotifierList reset_notifiers; |
| 53 | int64_t last; |
| 54 | |
| 55 | QEMUClockType type; |
| 56 | bool enabled; |
| 57 | } QEMUClock; |
| 58 | |
| 59 | QEMUTimerListGroup main_loop_tlg; |
| 60 | QEMUClock qemu_clocks[QEMU_CLOCK_MAX]; |
| 61 | |
| 62 | /* A QEMUTimerList is a list of timers attached to a clock. More |
| 63 | * than one QEMUTimerList can be attached to each clock, for instance |
| 64 | * used by different AioContexts / threads. Each clock also has |
| 65 | * a list of the QEMUTimerLists associated with it, in order that |
| 66 | * reenabling the clock can call all the notifiers. |
| 67 | */ |
| 68 | |
| 69 | struct QEMUTimerList { |
| 70 | QEMUClock *clock; |
| 71 | QemuMutex active_timers_lock; |
| 72 | QEMUTimer *active_timers; |
| 73 | QLIST_ENTRY(QEMUTimerList) list; |
| 74 | QEMUTimerListNotifyCB *notify_cb; |
| 75 | void *notify_opaque; |
| 76 | |
| 77 | /* lightweight method to mark the end of timerlist's running */ |
| 78 | QemuEvent timers_done_ev; |
David Turner | 6a9ef17 | 2010-09-09 22:54:36 +0200 | [diff] [blame] | 79 | }; |
| 80 | |
David 'Digit' Turner | dcda949 | 2014-02-16 15:13:55 +0100 | [diff] [blame] | 81 | /** |
| 82 | * qemu_clock_ptr: |
| 83 | * @type: type of clock |
| 84 | * |
| 85 | * Translate a clock type into a pointer to QEMUClock object. |
| 86 | * |
| 87 | * Returns: a pointer to the QEMUClock object |
| 88 | */ |
| 89 | static inline QEMUClock *qemu_clock_ptr(QEMUClockType type) |
| 90 | { |
| 91 | return &qemu_clocks[type]; |
David 'Digit' Turner | f9077a8 | 2014-02-10 23:10:47 +0100 | [diff] [blame] | 92 | } |
| 93 | |
David 'Digit' Turner | dcda949 | 2014-02-16 15:13:55 +0100 | [diff] [blame] | 94 | static bool timer_expired_ns(QEMUTimer *timer_head, int64_t current_time) |
David 'Digit' Turner | 317c9d5 | 2011-05-10 06:38:21 +0200 | [diff] [blame] | 95 | { |
| 96 | return timer_head && (timer_head->expire_time <= current_time); |
| 97 | } |
| 98 | |
David 'Digit' Turner | dcda949 | 2014-02-16 15:13:55 +0100 | [diff] [blame] | 99 | QEMUTimerList *timerlist_new(QEMUClockType type, |
| 100 | QEMUTimerListNotifyCB *cb, |
| 101 | void *opaque) |
David Turner | 6a9ef17 | 2010-09-09 22:54:36 +0200 | [diff] [blame] | 102 | { |
David 'Digit' Turner | dcda949 | 2014-02-16 15:13:55 +0100 | [diff] [blame] | 103 | QEMUTimerList *timer_list; |
| 104 | QEMUClock *clock = qemu_clock_ptr(type); |
| 105 | |
| 106 | timer_list = g_malloc0(sizeof(QEMUTimerList)); |
| 107 | qemu_event_init(&timer_list->timers_done_ev, false); |
| 108 | timer_list->clock = clock; |
| 109 | timer_list->notify_cb = cb; |
| 110 | timer_list->notify_opaque = opaque; |
| 111 | qemu_mutex_init(&timer_list->active_timers_lock); |
| 112 | QLIST_INSERT_HEAD(&clock->timerlists, timer_list, list); |
| 113 | return timer_list; |
| 114 | } |
| 115 | |
| 116 | void timerlist_free(QEMUTimerList *timer_list) |
| 117 | { |
| 118 | assert(!timerlist_has_timers(timer_list)); |
| 119 | if (timer_list->clock) { |
| 120 | QLIST_REMOVE(timer_list, list); |
| 121 | } |
| 122 | qemu_mutex_destroy(&timer_list->active_timers_lock); |
| 123 | g_free(timer_list); |
| 124 | } |
| 125 | |
| 126 | static void qemu_clock_init(QEMUClockType type) |
| 127 | { |
| 128 | QEMUClock *clock = qemu_clock_ptr(type); |
| 129 | |
David Turner | 6a9ef17 | 2010-09-09 22:54:36 +0200 | [diff] [blame] | 130 | clock->type = type; |
David 'Digit' Turner | dcda949 | 2014-02-16 15:13:55 +0100 | [diff] [blame] | 131 | clock->enabled = true; |
| 132 | clock->last = INT64_MIN; |
| 133 | QLIST_INIT(&clock->timerlists); |
| 134 | notifier_list_init(&clock->reset_notifiers); |
| 135 | main_loop_tlg.tl[type] = timerlist_new(type, NULL, NULL); |
David Turner | 6a9ef17 | 2010-09-09 22:54:36 +0200 | [diff] [blame] | 136 | } |
| 137 | |
David 'Digit' Turner | dcda949 | 2014-02-16 15:13:55 +0100 | [diff] [blame] | 138 | bool qemu_clock_use_for_deadline(QEMUClockType type) |
David Turner | 6a9ef17 | 2010-09-09 22:54:36 +0200 | [diff] [blame] | 139 | { |
David 'Digit' Turner | dcda949 | 2014-02-16 15:13:55 +0100 | [diff] [blame] | 140 | return !(use_icount && (type == QEMU_CLOCK_VIRTUAL)); |
| 141 | } |
| 142 | |
| 143 | void qemu_clock_notify(QEMUClockType type) |
| 144 | { |
| 145 | QEMUTimerList *timer_list; |
| 146 | QEMUClock *clock = qemu_clock_ptr(type); |
| 147 | QLIST_FOREACH(timer_list, &clock->timerlists, list) { |
| 148 | timerlist_notify(timer_list); |
| 149 | } |
| 150 | } |
| 151 | |
| 152 | /* Disabling the clock will wait for related timerlists to stop |
| 153 | * executing qemu_run_timers. Thus, this functions should not |
| 154 | * be used from the callback of a timer that is based on @clock. |
| 155 | * Doing so would cause a deadlock. |
| 156 | * |
| 157 | * Caller should hold BQL. |
| 158 | */ |
| 159 | void qemu_clock_enable(QEMUClockType type, bool enabled) |
| 160 | { |
| 161 | QEMUClock *clock = qemu_clock_ptr(type); |
| 162 | QEMUTimerList *tl; |
| 163 | bool old = clock->enabled; |
David Turner | 6a9ef17 | 2010-09-09 22:54:36 +0200 | [diff] [blame] | 164 | clock->enabled = enabled; |
David 'Digit' Turner | dcda949 | 2014-02-16 15:13:55 +0100 | [diff] [blame] | 165 | if (enabled && !old) { |
| 166 | qemu_clock_notify(type); |
| 167 | } else if (!enabled && old) { |
| 168 | QLIST_FOREACH(tl, &clock->timerlists, list) { |
| 169 | qemu_event_wait(&tl->timers_done_ev); |
| 170 | } |
| 171 | } |
David Turner | 6a9ef17 | 2010-09-09 22:54:36 +0200 | [diff] [blame] | 172 | } |
| 173 | |
David 'Digit' Turner | dcda949 | 2014-02-16 15:13:55 +0100 | [diff] [blame] | 174 | bool timerlist_has_timers(QEMUTimerList *timer_list) |
| 175 | { |
| 176 | return !!timer_list->active_timers; |
David 'Digit' Turner | 317c9d5 | 2011-05-10 06:38:21 +0200 | [diff] [blame] | 177 | } |
| 178 | |
David 'Digit' Turner | dcda949 | 2014-02-16 15:13:55 +0100 | [diff] [blame] | 179 | bool qemu_clock_has_timers(QEMUClockType type) |
| 180 | { |
| 181 | return timerlist_has_timers( |
| 182 | main_loop_tlg.tl[type]); |
| 183 | } |
David 'Digit' Turner | 317c9d5 | 2011-05-10 06:38:21 +0200 | [diff] [blame] | 184 | |
David 'Digit' Turner | dcda949 | 2014-02-16 15:13:55 +0100 | [diff] [blame] | 185 | bool timerlist_expired(QEMUTimerList *timer_list) |
| 186 | { |
| 187 | int64_t expire_time; |
| 188 | |
| 189 | qemu_mutex_lock(&timer_list->active_timers_lock); |
| 190 | if (!timer_list->active_timers) { |
| 191 | qemu_mutex_unlock(&timer_list->active_timers_lock); |
| 192 | return false; |
| 193 | } |
| 194 | expire_time = timer_list->active_timers->expire_time; |
| 195 | qemu_mutex_unlock(&timer_list->active_timers_lock); |
| 196 | |
| 197 | return expire_time < qemu_clock_get_ns(timer_list->clock->type); |
| 198 | } |
| 199 | |
| 200 | bool qemu_clock_expired(QEMUClockType type) |
| 201 | { |
| 202 | return timerlist_expired( |
| 203 | main_loop_tlg.tl[type]); |
| 204 | } |
| 205 | |
| 206 | /* |
| 207 | * As above, but return -1 for no deadline, and do not cap to 2^32 |
| 208 | * as we know the result is always positive. |
| 209 | */ |
| 210 | |
| 211 | int64_t timerlist_deadline_ns(QEMUTimerList *timer_list) |
| 212 | { |
| 213 | int64_t delta; |
| 214 | int64_t expire_time; |
| 215 | |
| 216 | if (!timer_list->clock->enabled) { |
| 217 | return -1; |
David 'Digit' Turner | 317c9d5 | 2011-05-10 06:38:21 +0200 | [diff] [blame] | 218 | } |
| 219 | |
David 'Digit' Turner | dcda949 | 2014-02-16 15:13:55 +0100 | [diff] [blame] | 220 | /* The active timers list may be modified before the caller uses our return |
| 221 | * value but ->notify_cb() is called when the deadline changes. Therefore |
| 222 | * the caller should notice the change and there is no race condition. |
| 223 | */ |
| 224 | qemu_mutex_lock(&timer_list->active_timers_lock); |
| 225 | if (!timer_list->active_timers) { |
| 226 | qemu_mutex_unlock(&timer_list->active_timers_lock); |
| 227 | return -1; |
| 228 | } |
| 229 | expire_time = timer_list->active_timers->expire_time; |
| 230 | qemu_mutex_unlock(&timer_list->active_timers_lock); |
| 231 | |
| 232 | delta = expire_time - qemu_clock_get_ns(timer_list->clock->type); |
| 233 | |
| 234 | if (delta <= 0) { |
| 235 | return 0; |
| 236 | } |
David 'Digit' Turner | 317c9d5 | 2011-05-10 06:38:21 +0200 | [diff] [blame] | 237 | |
David 'Digit' Turner | f9077a8 | 2014-02-10 23:10:47 +0100 | [diff] [blame] | 238 | return delta; |
David 'Digit' Turner | 317c9d5 | 2011-05-10 06:38:21 +0200 | [diff] [blame] | 239 | } |
| 240 | |
David 'Digit' Turner | dcda949 | 2014-02-16 15:13:55 +0100 | [diff] [blame] | 241 | /* Calculate the soonest deadline across all timerlists attached |
| 242 | * to the clock. This is used for the icount timeout so we |
| 243 | * ignore whether or not the clock should be used in deadline |
| 244 | * calculations. |
| 245 | */ |
| 246 | int64_t qemu_clock_deadline_ns_all(QEMUClockType type) |
David Turner | 6a9ef17 | 2010-09-09 22:54:36 +0200 | [diff] [blame] | 247 | { |
David 'Digit' Turner | dcda949 | 2014-02-16 15:13:55 +0100 | [diff] [blame] | 248 | int64_t deadline = -1; |
| 249 | QEMUTimerList *timer_list; |
| 250 | QEMUClock *clock = qemu_clock_ptr(type); |
| 251 | QLIST_FOREACH(timer_list, &clock->timerlists, list) { |
| 252 | deadline = qemu_soonest_timeout(deadline, |
| 253 | timerlist_deadline_ns(timer_list)); |
| 254 | } |
| 255 | return deadline; |
| 256 | } |
David Turner | 6a9ef17 | 2010-09-09 22:54:36 +0200 | [diff] [blame] | 257 | |
David 'Digit' Turner | dcda949 | 2014-02-16 15:13:55 +0100 | [diff] [blame] | 258 | QEMUClockType timerlist_get_clock(QEMUTimerList *timer_list) |
| 259 | { |
| 260 | return timer_list->clock->type; |
| 261 | } |
| 262 | |
| 263 | QEMUTimerList *qemu_clock_get_main_loop_timerlist(QEMUClockType type) |
| 264 | { |
| 265 | return main_loop_tlg.tl[type]; |
| 266 | } |
| 267 | |
| 268 | void timerlist_notify(QEMUTimerList *timer_list) |
| 269 | { |
| 270 | if (timer_list->notify_cb) { |
| 271 | timer_list->notify_cb(timer_list->notify_opaque); |
| 272 | } else { |
| 273 | qemu_notify_event(); |
| 274 | } |
| 275 | } |
| 276 | |
| 277 | /* Transition function to convert a nanosecond timeout to ms |
| 278 | * This is used where a system does not support ppoll |
| 279 | */ |
| 280 | int qemu_timeout_ns_to_ms(int64_t ns) |
| 281 | { |
| 282 | int64_t ms; |
| 283 | if (ns < 0) { |
| 284 | return -1; |
| 285 | } |
| 286 | |
| 287 | if (!ns) { |
| 288 | return 0; |
| 289 | } |
| 290 | |
| 291 | /* Always round up, because it's better to wait too long than to wait too |
| 292 | * little and effectively busy-wait |
| 293 | */ |
| 294 | ms = (ns + SCALE_MS - 1) / SCALE_MS; |
| 295 | |
| 296 | /* To avoid overflow problems, limit this to 2^31, i.e. approx 25 days */ |
| 297 | if (ms > (int64_t) INT32_MAX) { |
| 298 | ms = INT32_MAX; |
| 299 | } |
| 300 | |
| 301 | return (int) ms; |
| 302 | } |
| 303 | |
| 304 | #ifndef CONFIG_ANDROID // TODO(digit): Implement g_poll() |
| 305 | /* qemu implementation of g_poll which uses a nanosecond timeout but is |
| 306 | * otherwise identical to g_poll |
| 307 | */ |
| 308 | int qemu_poll_ns(GPollFD *fds, guint nfds, int64_t timeout) |
| 309 | { |
| 310 | #ifdef CONFIG_PPOLL |
| 311 | if (timeout < 0) { |
| 312 | return ppoll((struct pollfd *)fds, nfds, NULL, NULL); |
| 313 | } else { |
| 314 | struct timespec ts; |
| 315 | ts.tv_sec = timeout / 1000000000LL; |
| 316 | ts.tv_nsec = timeout % 1000000000LL; |
| 317 | return ppoll((struct pollfd *)fds, nfds, &ts, NULL); |
| 318 | } |
| 319 | #else |
| 320 | return g_poll(fds, nfds, qemu_timeout_ns_to_ms(timeout)); |
| 321 | #endif |
| 322 | } |
| 323 | #endif // !CONFIG_ANDROID |
| 324 | |
| 325 | void timer_init(QEMUTimer *ts, |
| 326 | QEMUTimerList *timer_list, int scale, |
| 327 | QEMUTimerCB *cb, void *opaque) |
| 328 | { |
| 329 | ts->timer_list = timer_list; |
David Turner | 6a9ef17 | 2010-09-09 22:54:36 +0200 | [diff] [blame] | 330 | ts->cb = cb; |
| 331 | ts->opaque = opaque; |
David 'Digit' Turner | 317c9d5 | 2011-05-10 06:38:21 +0200 | [diff] [blame] | 332 | ts->scale = scale; |
David 'Digit' Turner | dcda949 | 2014-02-16 15:13:55 +0100 | [diff] [blame] | 333 | ts->expire_time = -1; |
David Turner | 6a9ef17 | 2010-09-09 22:54:36 +0200 | [diff] [blame] | 334 | } |
| 335 | |
David 'Digit' Turner | dcda949 | 2014-02-16 15:13:55 +0100 | [diff] [blame] | 336 | void timer_free(QEMUTimer *ts) |
David Turner | 6a9ef17 | 2010-09-09 22:54:36 +0200 | [diff] [blame] | 337 | { |
David 'Digit' Turner | aa8236d | 2014-01-10 17:02:29 +0100 | [diff] [blame] | 338 | g_free(ts); |
David Turner | 6a9ef17 | 2010-09-09 22:54:36 +0200 | [diff] [blame] | 339 | } |
| 340 | |
David 'Digit' Turner | dcda949 | 2014-02-16 15:13:55 +0100 | [diff] [blame] | 341 | static void timer_del_locked(QEMUTimerList *timer_list, QEMUTimer *ts) |
David Turner | 6a9ef17 | 2010-09-09 22:54:36 +0200 | [diff] [blame] | 342 | { |
| 343 | QEMUTimer **pt, *t; |
| 344 | |
David 'Digit' Turner | dcda949 | 2014-02-16 15:13:55 +0100 | [diff] [blame] | 345 | ts->expire_time = -1; |
| 346 | pt = &timer_list->active_timers; |
David Turner | 6a9ef17 | 2010-09-09 22:54:36 +0200 | [diff] [blame] | 347 | for(;;) { |
| 348 | t = *pt; |
| 349 | if (!t) |
| 350 | break; |
| 351 | if (t == ts) { |
| 352 | *pt = t->next; |
| 353 | break; |
| 354 | } |
| 355 | pt = &t->next; |
| 356 | } |
| 357 | } |
| 358 | |
David 'Digit' Turner | dcda949 | 2014-02-16 15:13:55 +0100 | [diff] [blame] | 359 | static bool timer_mod_ns_locked(QEMUTimerList *timer_list, |
| 360 | QEMUTimer *ts, int64_t expire_time) |
David Turner | 6a9ef17 | 2010-09-09 22:54:36 +0200 | [diff] [blame] | 361 | { |
| 362 | QEMUTimer **pt, *t; |
| 363 | |
David Turner | 6a9ef17 | 2010-09-09 22:54:36 +0200 | [diff] [blame] | 364 | /* add the timer in the sorted list */ |
David 'Digit' Turner | dcda949 | 2014-02-16 15:13:55 +0100 | [diff] [blame] | 365 | pt = &timer_list->active_timers; |
| 366 | for (;;) { |
David Turner | 6a9ef17 | 2010-09-09 22:54:36 +0200 | [diff] [blame] | 367 | t = *pt; |
David 'Digit' Turner | dcda949 | 2014-02-16 15:13:55 +0100 | [diff] [blame] | 368 | if (!timer_expired_ns(t, expire_time)) { |
David Turner | 6a9ef17 | 2010-09-09 22:54:36 +0200 | [diff] [blame] | 369 | break; |
David 'Digit' Turner | 317c9d5 | 2011-05-10 06:38:21 +0200 | [diff] [blame] | 370 | } |
David Turner | 6a9ef17 | 2010-09-09 22:54:36 +0200 | [diff] [blame] | 371 | pt = &t->next; |
| 372 | } |
David 'Digit' Turner | dcda949 | 2014-02-16 15:13:55 +0100 | [diff] [blame] | 373 | ts->expire_time = MAX(expire_time, 0); |
David Turner | 6a9ef17 | 2010-09-09 22:54:36 +0200 | [diff] [blame] | 374 | ts->next = *pt; |
| 375 | *pt = ts; |
| 376 | |
David 'Digit' Turner | dcda949 | 2014-02-16 15:13:55 +0100 | [diff] [blame] | 377 | return pt == &timer_list->active_timers; |
| 378 | } |
| 379 | |
| 380 | static void timerlist_rearm(QEMUTimerList *timer_list) |
| 381 | { |
| 382 | /* Interrupt execution to force deadline recalculation. */ |
| 383 | qemu_clock_warp(timer_list->clock->type); |
| 384 | timerlist_notify(timer_list); |
| 385 | } |
| 386 | |
| 387 | /* stop a timer, but do not dealloc it */ |
| 388 | void timer_del(QEMUTimer *ts) |
| 389 | { |
| 390 | QEMUTimerList *timer_list = ts->timer_list; |
| 391 | |
| 392 | qemu_mutex_lock(&timer_list->active_timers_lock); |
| 393 | timer_del_locked(timer_list, ts); |
| 394 | qemu_mutex_unlock(&timer_list->active_timers_lock); |
David 'Digit' Turner | 317c9d5 | 2011-05-10 06:38:21 +0200 | [diff] [blame] | 395 | } |
| 396 | |
| 397 | /* modify the current timer so that it will be fired when current_time |
| 398 | >= expire_time. The corresponding callback will be called. */ |
David 'Digit' Turner | dcda949 | 2014-02-16 15:13:55 +0100 | [diff] [blame] | 399 | void timer_mod_ns(QEMUTimer *ts, int64_t expire_time) |
David 'Digit' Turner | 317c9d5 | 2011-05-10 06:38:21 +0200 | [diff] [blame] | 400 | { |
David 'Digit' Turner | dcda949 | 2014-02-16 15:13:55 +0100 | [diff] [blame] | 401 | QEMUTimerList *timer_list = ts->timer_list; |
| 402 | bool rearm; |
David Turner | 6a9ef17 | 2010-09-09 22:54:36 +0200 | [diff] [blame] | 403 | |
David 'Digit' Turner | dcda949 | 2014-02-16 15:13:55 +0100 | [diff] [blame] | 404 | qemu_mutex_lock(&timer_list->active_timers_lock); |
| 405 | timer_del_locked(timer_list, ts); |
| 406 | rearm = timer_mod_ns_locked(timer_list, ts, expire_time); |
| 407 | qemu_mutex_unlock(&timer_list->active_timers_lock); |
| 408 | |
| 409 | if (rearm) { |
| 410 | timerlist_rearm(timer_list); |
David Turner | 6a9ef17 | 2010-09-09 22:54:36 +0200 | [diff] [blame] | 411 | } |
David Turner | 6a9ef17 | 2010-09-09 22:54:36 +0200 | [diff] [blame] | 412 | } |
| 413 | |
David 'Digit' Turner | dcda949 | 2014-02-16 15:13:55 +0100 | [diff] [blame] | 414 | /* modify the current timer so that it will be fired when current_time |
| 415 | >= expire_time or the current deadline, whichever comes earlier. |
| 416 | The corresponding callback will be called. */ |
| 417 | void timer_mod_anticipate_ns(QEMUTimer *ts, int64_t expire_time) |
David Turner | 6a9ef17 | 2010-09-09 22:54:36 +0200 | [diff] [blame] | 418 | { |
David 'Digit' Turner | dcda949 | 2014-02-16 15:13:55 +0100 | [diff] [blame] | 419 | QEMUTimerList *timer_list = ts->timer_list; |
| 420 | bool rearm; |
| 421 | |
| 422 | qemu_mutex_lock(&timer_list->active_timers_lock); |
| 423 | if (ts->expire_time == -1 || ts->expire_time > expire_time) { |
| 424 | if (ts->expire_time != -1) { |
| 425 | timer_del_locked(timer_list, ts); |
| 426 | } |
| 427 | rearm = timer_mod_ns_locked(timer_list, ts, expire_time); |
| 428 | } else { |
| 429 | rearm = false; |
| 430 | } |
| 431 | qemu_mutex_unlock(&timer_list->active_timers_lock); |
| 432 | |
| 433 | if (rearm) { |
| 434 | timerlist_rearm(timer_list); |
| 435 | } |
David Turner | 6a9ef17 | 2010-09-09 22:54:36 +0200 | [diff] [blame] | 436 | } |
| 437 | |
David 'Digit' Turner | dcda949 | 2014-02-16 15:13:55 +0100 | [diff] [blame] | 438 | void timer_mod(QEMUTimer *ts, int64_t expire_time) |
David Turner | 6a9ef17 | 2010-09-09 22:54:36 +0200 | [diff] [blame] | 439 | { |
David 'Digit' Turner | dcda949 | 2014-02-16 15:13:55 +0100 | [diff] [blame] | 440 | timer_mod_ns(ts, expire_time * ts->scale); |
| 441 | } |
| 442 | |
| 443 | void timer_mod_anticipate(QEMUTimer *ts, int64_t expire_time) |
| 444 | { |
| 445 | timer_mod_anticipate_ns(ts, expire_time * ts->scale); |
| 446 | } |
| 447 | |
| 448 | bool timer_pending(QEMUTimer *ts) |
| 449 | { |
| 450 | return ts->expire_time >= 0; |
| 451 | } |
| 452 | |
| 453 | bool timer_expired(QEMUTimer *timer_head, int64_t current_time) |
| 454 | { |
| 455 | return timer_expired_ns(timer_head, current_time * timer_head->scale); |
| 456 | } |
| 457 | |
| 458 | bool timerlist_run_timers(QEMUTimerList *timer_list) |
| 459 | { |
| 460 | QEMUTimer *ts; |
David Turner | 6a9ef17 | 2010-09-09 22:54:36 +0200 | [diff] [blame] | 461 | int64_t current_time; |
David 'Digit' Turner | dcda949 | 2014-02-16 15:13:55 +0100 | [diff] [blame] | 462 | bool progress = false; |
| 463 | QEMUTimerCB *cb; |
| 464 | void *opaque; |
David 'Digit' Turner | 6b51281 | 2010-10-15 15:05:04 +0200 | [diff] [blame] | 465 | |
David 'Digit' Turner | dcda949 | 2014-02-16 15:13:55 +0100 | [diff] [blame] | 466 | qemu_event_reset(&timer_list->timers_done_ev); |
| 467 | if (!timer_list->clock->enabled) { |
| 468 | goto out; |
| 469 | } |
David Turner | 6a9ef17 | 2010-09-09 22:54:36 +0200 | [diff] [blame] | 470 | |
David 'Digit' Turner | dcda949 | 2014-02-16 15:13:55 +0100 | [diff] [blame] | 471 | current_time = qemu_clock_get_ns(timer_list->clock->type); |
David Turner | 6a9ef17 | 2010-09-09 22:54:36 +0200 | [diff] [blame] | 472 | for(;;) { |
David 'Digit' Turner | dcda949 | 2014-02-16 15:13:55 +0100 | [diff] [blame] | 473 | qemu_mutex_lock(&timer_list->active_timers_lock); |
| 474 | ts = timer_list->active_timers; |
| 475 | if (!timer_expired_ns(ts, current_time)) { |
| 476 | qemu_mutex_unlock(&timer_list->active_timers_lock); |
David Turner | 6a9ef17 | 2010-09-09 22:54:36 +0200 | [diff] [blame] | 477 | break; |
David 'Digit' Turner | 317c9d5 | 2011-05-10 06:38:21 +0200 | [diff] [blame] | 478 | } |
David 'Digit' Turner | dcda949 | 2014-02-16 15:13:55 +0100 | [diff] [blame] | 479 | |
David Turner | 6a9ef17 | 2010-09-09 22:54:36 +0200 | [diff] [blame] | 480 | /* remove timer from the list before calling the callback */ |
David 'Digit' Turner | dcda949 | 2014-02-16 15:13:55 +0100 | [diff] [blame] | 481 | timer_list->active_timers = ts->next; |
David Turner | 6a9ef17 | 2010-09-09 22:54:36 +0200 | [diff] [blame] | 482 | ts->next = NULL; |
David 'Digit' Turner | dcda949 | 2014-02-16 15:13:55 +0100 | [diff] [blame] | 483 | ts->expire_time = -1; |
| 484 | cb = ts->cb; |
| 485 | opaque = ts->opaque; |
| 486 | qemu_mutex_unlock(&timer_list->active_timers_lock); |
David Turner | 6a9ef17 | 2010-09-09 22:54:36 +0200 | [diff] [blame] | 487 | |
| 488 | /* run the callback (the timer list can be modified) */ |
David 'Digit' Turner | dcda949 | 2014-02-16 15:13:55 +0100 | [diff] [blame] | 489 | cb(opaque); |
| 490 | progress = true; |
| 491 | } |
| 492 | |
| 493 | out: |
| 494 | qemu_event_set(&timer_list->timers_done_ev); |
| 495 | return progress; |
| 496 | } |
| 497 | |
| 498 | bool qemu_clock_run_timers(QEMUClockType type) |
| 499 | { |
| 500 | return timerlist_run_timers(main_loop_tlg.tl[type]); |
| 501 | } |
| 502 | |
| 503 | void timerlistgroup_init(QEMUTimerListGroup *tlg, |
| 504 | QEMUTimerListNotifyCB *cb, void *opaque) |
| 505 | { |
| 506 | QEMUClockType type; |
| 507 | for (type = 0; type < QEMU_CLOCK_MAX; type++) { |
| 508 | tlg->tl[type] = timerlist_new(type, cb, opaque); |
David Turner | 6a9ef17 | 2010-09-09 22:54:36 +0200 | [diff] [blame] | 509 | } |
| 510 | } |
| 511 | |
David 'Digit' Turner | dcda949 | 2014-02-16 15:13:55 +0100 | [diff] [blame] | 512 | void timerlistgroup_deinit(QEMUTimerListGroup *tlg) |
David Turner | 6a9ef17 | 2010-09-09 22:54:36 +0200 | [diff] [blame] | 513 | { |
David 'Digit' Turner | dcda949 | 2014-02-16 15:13:55 +0100 | [diff] [blame] | 514 | QEMUClockType type; |
| 515 | for (type = 0; type < QEMU_CLOCK_MAX; type++) { |
| 516 | timerlist_free(tlg->tl[type]); |
| 517 | } |
| 518 | } |
| 519 | |
| 520 | bool timerlistgroup_run_timers(QEMUTimerListGroup *tlg) |
| 521 | { |
| 522 | QEMUClockType type; |
| 523 | bool progress = false; |
| 524 | for (type = 0; type < QEMU_CLOCK_MAX; type++) { |
| 525 | progress |= timerlist_run_timers(tlg->tl[type]); |
| 526 | } |
| 527 | return progress; |
| 528 | } |
| 529 | |
| 530 | int64_t timerlistgroup_deadline_ns(QEMUTimerListGroup *tlg) |
| 531 | { |
| 532 | int64_t deadline = -1; |
| 533 | QEMUClockType type; |
| 534 | for (type = 0; type < QEMU_CLOCK_MAX; type++) { |
| 535 | if (qemu_clock_use_for_deadline(tlg->tl[type]->clock->type)) { |
| 536 | deadline = qemu_soonest_timeout(deadline, |
| 537 | timerlist_deadline_ns( |
| 538 | tlg->tl[type])); |
David Turner | 6a9ef17 | 2010-09-09 22:54:36 +0200 | [diff] [blame] | 539 | } |
David Turner | 6a9ef17 | 2010-09-09 22:54:36 +0200 | [diff] [blame] | 540 | } |
David 'Digit' Turner | dcda949 | 2014-02-16 15:13:55 +0100 | [diff] [blame] | 541 | return deadline; |
David Turner | 6a9ef17 | 2010-09-09 22:54:36 +0200 | [diff] [blame] | 542 | } |
| 543 | |
David 'Digit' Turner | dcda949 | 2014-02-16 15:13:55 +0100 | [diff] [blame] | 544 | int64_t qemu_clock_get_ns(QEMUClockType type) |
David Turner | 6a9ef17 | 2010-09-09 22:54:36 +0200 | [diff] [blame] | 545 | { |
David 'Digit' Turner | dcda949 | 2014-02-16 15:13:55 +0100 | [diff] [blame] | 546 | int64_t now, last; |
| 547 | QEMUClock *clock = qemu_clock_ptr(type); |
| 548 | |
| 549 | switch (type) { |
David Turner | 6a9ef17 | 2010-09-09 22:54:36 +0200 | [diff] [blame] | 550 | case QEMU_CLOCK_REALTIME: |
| 551 | return get_clock(); |
| 552 | default: |
| 553 | case QEMU_CLOCK_VIRTUAL: |
| 554 | if (use_icount) { |
| 555 | return cpu_get_icount(); |
| 556 | } else { |
| 557 | return cpu_get_clock(); |
| 558 | } |
| 559 | case QEMU_CLOCK_HOST: |
David 'Digit' Turner | dcda949 | 2014-02-16 15:13:55 +0100 | [diff] [blame] | 560 | now = get_clock_realtime(); |
| 561 | last = clock->last; |
| 562 | clock->last = now; |
| 563 | if (now < last) { |
| 564 | notifier_list_notify(&clock->reset_notifiers, &now); |
| 565 | } |
| 566 | return now; |
David Turner | 6a9ef17 | 2010-09-09 22:54:36 +0200 | [diff] [blame] | 567 | } |
| 568 | } |
| 569 | |
David 'Digit' Turner | dcda949 | 2014-02-16 15:13:55 +0100 | [diff] [blame] | 570 | void qemu_clock_register_reset_notifier(QEMUClockType type, |
| 571 | Notifier *notifier) |
| 572 | { |
| 573 | QEMUClock *clock = qemu_clock_ptr(type); |
| 574 | notifier_list_add(&clock->reset_notifiers, notifier); |
| 575 | } |
| 576 | |
| 577 | void qemu_clock_unregister_reset_notifier(QEMUClockType type, |
| 578 | Notifier *notifier) |
| 579 | { |
| 580 | notifier_remove(notifier); |
| 581 | } |
| 582 | |
David Turner | 6a9ef17 | 2010-09-09 22:54:36 +0200 | [diff] [blame] | 583 | void init_clocks(void) |
| 584 | { |
David 'Digit' Turner | dcda949 | 2014-02-16 15:13:55 +0100 | [diff] [blame] | 585 | QEMUClockType type; |
| 586 | for (type = 0; type < QEMU_CLOCK_MAX; type++) { |
| 587 | qemu_clock_init(type); |
David Turner | 6a9ef17 | 2010-09-09 22:54:36 +0200 | [diff] [blame] | 588 | } |
David Turner | 6a9ef17 | 2010-09-09 22:54:36 +0200 | [diff] [blame] | 589 | |
David 'Digit' Turner | dcda949 | 2014-02-16 15:13:55 +0100 | [diff] [blame] | 590 | #ifdef CONFIG_PRCTL_PR_SET_TIMERSLACK |
| 591 | prctl(PR_SET_TIMERSLACK, 1, 0, 0, 0); |
David Turner | 6a9ef17 | 2010-09-09 22:54:36 +0200 | [diff] [blame] | 592 | #endif |
David 'Digit' Turner | dcda949 | 2014-02-16 15:13:55 +0100 | [diff] [blame] | 593 | } |
| 594 | |
| 595 | uint64_t timer_expire_time_ns(QEMUTimer *ts) |
| 596 | { |
| 597 | return timer_pending(ts) ? ts->expire_time : -1; |
| 598 | } |
| 599 | |
| 600 | bool qemu_clock_run_all_timers(void) |
| 601 | { |
| 602 | bool progress = false; |
| 603 | QEMUClockType type; |
| 604 | |
| 605 | for (type = 0; type < QEMU_CLOCK_MAX; type++) { |
| 606 | progress |= qemu_clock_run_timers(type); |
| 607 | } |
| 608 | |
| 609 | return progress; |
| 610 | } |