root / qemu-timer.c @ d25f89c9
History | View | Annotate | Download (32 kB)
1 | db1a4972 | Paolo Bonzini | /*
|
---|---|---|---|
2 | db1a4972 | Paolo Bonzini | * QEMU System Emulator
|
3 | db1a4972 | Paolo Bonzini | *
|
4 | db1a4972 | Paolo Bonzini | * Copyright (c) 2003-2008 Fabrice Bellard
|
5 | db1a4972 | Paolo Bonzini | *
|
6 | db1a4972 | Paolo Bonzini | * Permission is hereby granted, free of charge, to any person obtaining a copy
|
7 | db1a4972 | Paolo Bonzini | * of this software and associated documentation files (the "Software"), to deal
|
8 | db1a4972 | Paolo Bonzini | * in the Software without restriction, including without limitation the rights
|
9 | db1a4972 | Paolo Bonzini | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
10 | db1a4972 | Paolo Bonzini | * copies of the Software, and to permit persons to whom the Software is
|
11 | db1a4972 | Paolo Bonzini | * furnished to do so, subject to the following conditions:
|
12 | db1a4972 | Paolo Bonzini | *
|
13 | db1a4972 | Paolo Bonzini | * The above copyright notice and this permission notice shall be included in
|
14 | db1a4972 | Paolo Bonzini | * all copies or substantial portions of the Software.
|
15 | db1a4972 | Paolo Bonzini | *
|
16 | db1a4972 | Paolo Bonzini | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
17 | db1a4972 | Paolo Bonzini | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
18 | db1a4972 | Paolo Bonzini | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
|
19 | db1a4972 | Paolo Bonzini | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
20 | db1a4972 | Paolo Bonzini | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
21 | db1a4972 | Paolo Bonzini | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
22 | db1a4972 | Paolo Bonzini | * THE SOFTWARE.
|
23 | db1a4972 | Paolo Bonzini | */
|
24 | db1a4972 | Paolo Bonzini | |
25 | db1a4972 | Paolo Bonzini | #include "sysemu.h" |
26 | db1a4972 | Paolo Bonzini | #include "net.h" |
27 | db1a4972 | Paolo Bonzini | #include "monitor.h" |
28 | db1a4972 | Paolo Bonzini | #include "console.h" |
29 | db1a4972 | Paolo Bonzini | |
30 | db1a4972 | Paolo Bonzini | #include "hw/hw.h" |
31 | db1a4972 | Paolo Bonzini | |
32 | db1a4972 | Paolo Bonzini | #include <unistd.h> |
33 | db1a4972 | Paolo Bonzini | #include <fcntl.h> |
34 | db1a4972 | Paolo Bonzini | #include <time.h> |
35 | db1a4972 | Paolo Bonzini | #include <errno.h> |
36 | db1a4972 | Paolo Bonzini | #include <sys/time.h> |
37 | db1a4972 | Paolo Bonzini | #include <signal.h> |
38 | 44459349 | Juergen Lock | #ifdef __FreeBSD__
|
39 | 44459349 | Juergen Lock | #include <sys/param.h> |
40 | 44459349 | Juergen Lock | #endif
|
41 | db1a4972 | Paolo Bonzini | |
42 | db1a4972 | Paolo Bonzini | #ifdef _WIN32
|
43 | db1a4972 | Paolo Bonzini | #include <windows.h> |
44 | db1a4972 | Paolo Bonzini | #include <mmsystem.h> |
45 | db1a4972 | Paolo Bonzini | #endif
|
46 | db1a4972 | Paolo Bonzini | |
47 | db1a4972 | Paolo Bonzini | #include "qemu-timer.h" |
48 | db1a4972 | Paolo Bonzini | |
49 | db1a4972 | Paolo Bonzini | /* Conversion factor from emulated instructions to virtual clock ticks. */
|
50 | 29e922b6 | Blue Swirl | int icount_time_shift;
|
51 | db1a4972 | Paolo Bonzini | /* Arbitrarily pick 1MIPS as the minimum allowable speed. */
|
52 | db1a4972 | Paolo Bonzini | #define MAX_ICOUNT_SHIFT 10 |
53 | db1a4972 | Paolo Bonzini | /* Compensate for varying guest execution speed. */
|
54 | 29e922b6 | Blue Swirl | int64_t qemu_icount_bias; |
55 | db1a4972 | Paolo Bonzini | static QEMUTimer *icount_rt_timer;
|
56 | db1a4972 | Paolo Bonzini | static QEMUTimer *icount_vm_timer;
|
57 | db1a4972 | Paolo Bonzini | |
58 | db1a4972 | Paolo Bonzini | /***********************************************************/
|
59 | db1a4972 | Paolo Bonzini | /* guest cycle counter */
|
60 | db1a4972 | Paolo Bonzini | |
61 | db1a4972 | Paolo Bonzini | typedef struct TimersState { |
62 | db1a4972 | Paolo Bonzini | int64_t cpu_ticks_prev; |
63 | db1a4972 | Paolo Bonzini | int64_t cpu_ticks_offset; |
64 | db1a4972 | Paolo Bonzini | int64_t cpu_clock_offset; |
65 | db1a4972 | Paolo Bonzini | int32_t cpu_ticks_enabled; |
66 | db1a4972 | Paolo Bonzini | int64_t dummy; |
67 | db1a4972 | Paolo Bonzini | } TimersState; |
68 | db1a4972 | Paolo Bonzini | |
69 | db1a4972 | Paolo Bonzini | TimersState timers_state; |
70 | db1a4972 | Paolo Bonzini | |
71 | db1a4972 | Paolo Bonzini | /* return the host CPU cycle counter and handle stop/restart */
|
72 | db1a4972 | Paolo Bonzini | int64_t cpu_get_ticks(void)
|
73 | db1a4972 | Paolo Bonzini | { |
74 | db1a4972 | Paolo Bonzini | if (use_icount) {
|
75 | db1a4972 | Paolo Bonzini | return cpu_get_icount();
|
76 | db1a4972 | Paolo Bonzini | } |
77 | db1a4972 | Paolo Bonzini | if (!timers_state.cpu_ticks_enabled) {
|
78 | db1a4972 | Paolo Bonzini | return timers_state.cpu_ticks_offset;
|
79 | db1a4972 | Paolo Bonzini | } else {
|
80 | db1a4972 | Paolo Bonzini | int64_t ticks; |
81 | db1a4972 | Paolo Bonzini | ticks = cpu_get_real_ticks(); |
82 | db1a4972 | Paolo Bonzini | if (timers_state.cpu_ticks_prev > ticks) {
|
83 | db1a4972 | Paolo Bonzini | /* Note: non increasing ticks may happen if the host uses
|
84 | db1a4972 | Paolo Bonzini | software suspend */
|
85 | db1a4972 | Paolo Bonzini | timers_state.cpu_ticks_offset += timers_state.cpu_ticks_prev - ticks; |
86 | db1a4972 | Paolo Bonzini | } |
87 | db1a4972 | Paolo Bonzini | timers_state.cpu_ticks_prev = ticks; |
88 | db1a4972 | Paolo Bonzini | return ticks + timers_state.cpu_ticks_offset;
|
89 | db1a4972 | Paolo Bonzini | } |
90 | db1a4972 | Paolo Bonzini | } |
91 | db1a4972 | Paolo Bonzini | |
92 | db1a4972 | Paolo Bonzini | /* return the host CPU monotonic timer and handle stop/restart */
|
93 | db1a4972 | Paolo Bonzini | static int64_t cpu_get_clock(void) |
94 | db1a4972 | Paolo Bonzini | { |
95 | db1a4972 | Paolo Bonzini | int64_t ti; |
96 | db1a4972 | Paolo Bonzini | if (!timers_state.cpu_ticks_enabled) {
|
97 | db1a4972 | Paolo Bonzini | return timers_state.cpu_clock_offset;
|
98 | db1a4972 | Paolo Bonzini | } else {
|
99 | db1a4972 | Paolo Bonzini | ti = get_clock(); |
100 | db1a4972 | Paolo Bonzini | return ti + timers_state.cpu_clock_offset;
|
101 | db1a4972 | Paolo Bonzini | } |
102 | db1a4972 | Paolo Bonzini | } |
103 | db1a4972 | Paolo Bonzini | |
104 | 1ece93a9 | Paolo Bonzini | #ifndef CONFIG_IOTHREAD
|
105 | db1a4972 | Paolo Bonzini | static int64_t qemu_icount_delta(void) |
106 | db1a4972 | Paolo Bonzini | { |
107 | 1ece93a9 | Paolo Bonzini | if (!use_icount) {
|
108 | 1ece93a9 | Paolo Bonzini | return 5000 * (int64_t) 1000000; |
109 | 1ece93a9 | Paolo Bonzini | } else if (use_icount == 1) { |
110 | db1a4972 | Paolo Bonzini | /* When not using an adaptive execution frequency
|
111 | db1a4972 | Paolo Bonzini | we tend to get badly out of sync with real time,
|
112 | db1a4972 | Paolo Bonzini | so just delay for a reasonable amount of time. */
|
113 | db1a4972 | Paolo Bonzini | return 0; |
114 | db1a4972 | Paolo Bonzini | } else {
|
115 | db1a4972 | Paolo Bonzini | return cpu_get_icount() - cpu_get_clock();
|
116 | db1a4972 | Paolo Bonzini | } |
117 | db1a4972 | Paolo Bonzini | } |
118 | 1ece93a9 | Paolo Bonzini | #endif
|
119 | db1a4972 | Paolo Bonzini | |
120 | db1a4972 | Paolo Bonzini | /* enable cpu_get_ticks() */
|
121 | db1a4972 | Paolo Bonzini | void cpu_enable_ticks(void) |
122 | db1a4972 | Paolo Bonzini | { |
123 | db1a4972 | Paolo Bonzini | if (!timers_state.cpu_ticks_enabled) {
|
124 | db1a4972 | Paolo Bonzini | timers_state.cpu_ticks_offset -= cpu_get_real_ticks(); |
125 | db1a4972 | Paolo Bonzini | timers_state.cpu_clock_offset -= get_clock(); |
126 | db1a4972 | Paolo Bonzini | timers_state.cpu_ticks_enabled = 1;
|
127 | db1a4972 | Paolo Bonzini | } |
128 | db1a4972 | Paolo Bonzini | } |
129 | db1a4972 | Paolo Bonzini | |
130 | db1a4972 | Paolo Bonzini | /* disable cpu_get_ticks() : the clock is stopped. You must not call
|
131 | db1a4972 | Paolo Bonzini | cpu_get_ticks() after that. */
|
132 | db1a4972 | Paolo Bonzini | void cpu_disable_ticks(void) |
133 | db1a4972 | Paolo Bonzini | { |
134 | db1a4972 | Paolo Bonzini | if (timers_state.cpu_ticks_enabled) {
|
135 | db1a4972 | Paolo Bonzini | timers_state.cpu_ticks_offset = cpu_get_ticks(); |
136 | db1a4972 | Paolo Bonzini | timers_state.cpu_clock_offset = cpu_get_clock(); |
137 | db1a4972 | Paolo Bonzini | timers_state.cpu_ticks_enabled = 0;
|
138 | db1a4972 | Paolo Bonzini | } |
139 | db1a4972 | Paolo Bonzini | } |
140 | db1a4972 | Paolo Bonzini | |
141 | db1a4972 | Paolo Bonzini | /***********************************************************/
|
142 | db1a4972 | Paolo Bonzini | /* timers */
|
143 | db1a4972 | Paolo Bonzini | |
144 | db1a4972 | Paolo Bonzini | #define QEMU_CLOCK_REALTIME 0 |
145 | db1a4972 | Paolo Bonzini | #define QEMU_CLOCK_VIRTUAL 1 |
146 | db1a4972 | Paolo Bonzini | #define QEMU_CLOCK_HOST 2 |
147 | db1a4972 | Paolo Bonzini | |
148 | db1a4972 | Paolo Bonzini | struct QEMUClock {
|
149 | db1a4972 | Paolo Bonzini | int type;
|
150 | db1a4972 | Paolo Bonzini | int enabled;
|
151 | ab33fcda | Paolo Bonzini | |
152 | ab33fcda | Paolo Bonzini | QEMUTimer *warp_timer; |
153 | 691a0c9c | Jan Kiszka | |
154 | 691a0c9c | Jan Kiszka | NotifierList reset_notifiers; |
155 | 691a0c9c | Jan Kiszka | int64_t last; |
156 | db1a4972 | Paolo Bonzini | }; |
157 | db1a4972 | Paolo Bonzini | |
158 | db1a4972 | Paolo Bonzini | struct QEMUTimer {
|
159 | db1a4972 | Paolo Bonzini | QEMUClock *clock; |
160 | 4a998740 | Paolo Bonzini | int64_t expire_time; /* in nanoseconds */
|
161 | 4a998740 | Paolo Bonzini | int scale;
|
162 | db1a4972 | Paolo Bonzini | QEMUTimerCB *cb; |
163 | db1a4972 | Paolo Bonzini | void *opaque;
|
164 | db1a4972 | Paolo Bonzini | struct QEMUTimer *next;
|
165 | db1a4972 | Paolo Bonzini | }; |
166 | db1a4972 | Paolo Bonzini | |
167 | db1a4972 | Paolo Bonzini | struct qemu_alarm_timer {
|
168 | db1a4972 | Paolo Bonzini | char const *name; |
169 | db1a4972 | Paolo Bonzini | int (*start)(struct qemu_alarm_timer *t); |
170 | db1a4972 | Paolo Bonzini | void (*stop)(struct qemu_alarm_timer *t); |
171 | db1a4972 | Paolo Bonzini | void (*rearm)(struct qemu_alarm_timer *t); |
172 | cd0544ee | Stefan Weil | #if defined(__linux__)
|
173 | cd0544ee | Stefan Weil | int fd;
|
174 | cd0544ee | Stefan Weil | timer_t timer; |
175 | cd0544ee | Stefan Weil | #elif defined(_WIN32)
|
176 | cd0544ee | Stefan Weil | HANDLE timer; |
177 | cd0544ee | Stefan Weil | #endif
|
178 | db1a4972 | Paolo Bonzini | char expired;
|
179 | db1a4972 | Paolo Bonzini | char pending;
|
180 | db1a4972 | Paolo Bonzini | }; |
181 | db1a4972 | Paolo Bonzini | |
182 | db1a4972 | Paolo Bonzini | static struct qemu_alarm_timer *alarm_timer; |
183 | db1a4972 | Paolo Bonzini | |
184 | 45c7b37f | Stefan Weil | static bool qemu_timer_expired_ns(QEMUTimer *timer_head, int64_t current_time) |
185 | 45c7b37f | Stefan Weil | { |
186 | 45c7b37f | Stefan Weil | return timer_head && (timer_head->expire_time <= current_time);
|
187 | 45c7b37f | Stefan Weil | } |
188 | 45c7b37f | Stefan Weil | |
189 | db1a4972 | Paolo Bonzini | int qemu_alarm_pending(void) |
190 | db1a4972 | Paolo Bonzini | { |
191 | db1a4972 | Paolo Bonzini | return alarm_timer->pending;
|
192 | db1a4972 | Paolo Bonzini | } |
193 | db1a4972 | Paolo Bonzini | |
194 | db1a4972 | Paolo Bonzini | static inline int alarm_has_dynticks(struct qemu_alarm_timer *t) |
195 | db1a4972 | Paolo Bonzini | { |
196 | db1a4972 | Paolo Bonzini | return !!t->rearm;
|
197 | db1a4972 | Paolo Bonzini | } |
198 | db1a4972 | Paolo Bonzini | |
199 | db1a4972 | Paolo Bonzini | static void qemu_rearm_alarm_timer(struct qemu_alarm_timer *t) |
200 | db1a4972 | Paolo Bonzini | { |
201 | db1a4972 | Paolo Bonzini | if (!alarm_has_dynticks(t))
|
202 | db1a4972 | Paolo Bonzini | return;
|
203 | db1a4972 | Paolo Bonzini | |
204 | db1a4972 | Paolo Bonzini | t->rearm(t); |
205 | db1a4972 | Paolo Bonzini | } |
206 | db1a4972 | Paolo Bonzini | |
207 | 9c13246a | Paolo Bonzini | /* TODO: MIN_TIMER_REARM_NS should be optimized */
|
208 | 9c13246a | Paolo Bonzini | #define MIN_TIMER_REARM_NS 250000 |
209 | db1a4972 | Paolo Bonzini | |
210 | db1a4972 | Paolo Bonzini | #ifdef _WIN32
|
211 | db1a4972 | Paolo Bonzini | |
212 | 2f9cba0c | Stefan Weil | static int mm_start_timer(struct qemu_alarm_timer *t); |
213 | 2f9cba0c | Stefan Weil | static void mm_stop_timer(struct qemu_alarm_timer *t); |
214 | 2f9cba0c | Stefan Weil | static void mm_rearm_timer(struct qemu_alarm_timer *t); |
215 | 2f9cba0c | Stefan Weil | |
216 | db1a4972 | Paolo Bonzini | static int win32_start_timer(struct qemu_alarm_timer *t); |
217 | db1a4972 | Paolo Bonzini | static void win32_stop_timer(struct qemu_alarm_timer *t); |
218 | db1a4972 | Paolo Bonzini | static void win32_rearm_timer(struct qemu_alarm_timer *t); |
219 | db1a4972 | Paolo Bonzini | |
220 | db1a4972 | Paolo Bonzini | #else
|
221 | db1a4972 | Paolo Bonzini | |
222 | db1a4972 | Paolo Bonzini | static int unix_start_timer(struct qemu_alarm_timer *t); |
223 | db1a4972 | Paolo Bonzini | static void unix_stop_timer(struct qemu_alarm_timer *t); |
224 | 84682834 | Paolo Bonzini | static void unix_rearm_timer(struct qemu_alarm_timer *t); |
225 | db1a4972 | Paolo Bonzini | |
226 | db1a4972 | Paolo Bonzini | #ifdef __linux__
|
227 | db1a4972 | Paolo Bonzini | |
228 | db1a4972 | Paolo Bonzini | static int dynticks_start_timer(struct qemu_alarm_timer *t); |
229 | db1a4972 | Paolo Bonzini | static void dynticks_stop_timer(struct qemu_alarm_timer *t); |
230 | db1a4972 | Paolo Bonzini | static void dynticks_rearm_timer(struct qemu_alarm_timer *t); |
231 | db1a4972 | Paolo Bonzini | |
232 | db1a4972 | Paolo Bonzini | #endif /* __linux__ */ |
233 | db1a4972 | Paolo Bonzini | |
234 | db1a4972 | Paolo Bonzini | #endif /* _WIN32 */ |
235 | db1a4972 | Paolo Bonzini | |
236 | db1a4972 | Paolo Bonzini | /* Correlation between real and virtual time is always going to be
|
237 | db1a4972 | Paolo Bonzini | fairly approximate, so ignore small variation.
|
238 | db1a4972 | Paolo Bonzini | When the guest is idle real and virtual time will be aligned in
|
239 | db1a4972 | Paolo Bonzini | the IO wait loop. */
|
240 | db1a4972 | Paolo Bonzini | #define ICOUNT_WOBBLE (get_ticks_per_sec() / 10) |
241 | db1a4972 | Paolo Bonzini | |
242 | db1a4972 | Paolo Bonzini | static void icount_adjust(void) |
243 | db1a4972 | Paolo Bonzini | { |
244 | db1a4972 | Paolo Bonzini | int64_t cur_time; |
245 | db1a4972 | Paolo Bonzini | int64_t cur_icount; |
246 | db1a4972 | Paolo Bonzini | int64_t delta; |
247 | db1a4972 | Paolo Bonzini | static int64_t last_delta;
|
248 | db1a4972 | Paolo Bonzini | /* If the VM is not running, then do nothing. */
|
249 | db1a4972 | Paolo Bonzini | if (!vm_running)
|
250 | db1a4972 | Paolo Bonzini | return;
|
251 | db1a4972 | Paolo Bonzini | |
252 | db1a4972 | Paolo Bonzini | cur_time = cpu_get_clock(); |
253 | 74475455 | Paolo Bonzini | cur_icount = qemu_get_clock_ns(vm_clock); |
254 | db1a4972 | Paolo Bonzini | delta = cur_icount - cur_time; |
255 | db1a4972 | Paolo Bonzini | /* FIXME: This is a very crude algorithm, somewhat prone to oscillation. */
|
256 | db1a4972 | Paolo Bonzini | if (delta > 0 |
257 | db1a4972 | Paolo Bonzini | && last_delta + ICOUNT_WOBBLE < delta * 2
|
258 | db1a4972 | Paolo Bonzini | && icount_time_shift > 0) {
|
259 | db1a4972 | Paolo Bonzini | /* The guest is getting too far ahead. Slow time down. */
|
260 | db1a4972 | Paolo Bonzini | icount_time_shift--; |
261 | db1a4972 | Paolo Bonzini | } |
262 | db1a4972 | Paolo Bonzini | if (delta < 0 |
263 | db1a4972 | Paolo Bonzini | && last_delta - ICOUNT_WOBBLE > delta * 2
|
264 | db1a4972 | Paolo Bonzini | && icount_time_shift < MAX_ICOUNT_SHIFT) { |
265 | db1a4972 | Paolo Bonzini | /* The guest is getting too far behind. Speed time up. */
|
266 | db1a4972 | Paolo Bonzini | icount_time_shift++; |
267 | db1a4972 | Paolo Bonzini | } |
268 | db1a4972 | Paolo Bonzini | last_delta = delta; |
269 | db1a4972 | Paolo Bonzini | qemu_icount_bias = cur_icount - (qemu_icount << icount_time_shift); |
270 | db1a4972 | Paolo Bonzini | } |
271 | db1a4972 | Paolo Bonzini | |
272 | db1a4972 | Paolo Bonzini | static void icount_adjust_rt(void * opaque) |
273 | db1a4972 | Paolo Bonzini | { |
274 | db1a4972 | Paolo Bonzini | qemu_mod_timer(icount_rt_timer, |
275 | 7bd427d8 | Paolo Bonzini | qemu_get_clock_ms(rt_clock) + 1000);
|
276 | db1a4972 | Paolo Bonzini | icount_adjust(); |
277 | db1a4972 | Paolo Bonzini | } |
278 | db1a4972 | Paolo Bonzini | |
279 | db1a4972 | Paolo Bonzini | static void icount_adjust_vm(void * opaque) |
280 | db1a4972 | Paolo Bonzini | { |
281 | db1a4972 | Paolo Bonzini | qemu_mod_timer(icount_vm_timer, |
282 | 74475455 | Paolo Bonzini | qemu_get_clock_ns(vm_clock) + get_ticks_per_sec() / 10);
|
283 | db1a4972 | Paolo Bonzini | icount_adjust(); |
284 | db1a4972 | Paolo Bonzini | } |
285 | db1a4972 | Paolo Bonzini | |
286 | db1a4972 | Paolo Bonzini | int64_t qemu_icount_round(int64_t count) |
287 | db1a4972 | Paolo Bonzini | { |
288 | db1a4972 | Paolo Bonzini | return (count + (1 << icount_time_shift) - 1) >> icount_time_shift; |
289 | db1a4972 | Paolo Bonzini | } |
290 | db1a4972 | Paolo Bonzini | |
291 | db1a4972 | Paolo Bonzini | static struct qemu_alarm_timer alarm_timers[] = { |
292 | db1a4972 | Paolo Bonzini | #ifndef _WIN32
|
293 | db1a4972 | Paolo Bonzini | #ifdef __linux__
|
294 | db1a4972 | Paolo Bonzini | {"dynticks", dynticks_start_timer,
|
295 | cd0544ee | Stefan Weil | dynticks_stop_timer, dynticks_rearm_timer}, |
296 | db1a4972 | Paolo Bonzini | #endif
|
297 | 84682834 | Paolo Bonzini | {"unix", unix_start_timer, unix_stop_timer, unix_rearm_timer},
|
298 | db1a4972 | Paolo Bonzini | #else
|
299 | 2f9cba0c | Stefan Weil | {"mmtimer", mm_start_timer, mm_stop_timer, NULL}, |
300 | 2f9cba0c | Stefan Weil | {"mmtimer2", mm_start_timer, mm_stop_timer, mm_rearm_timer},
|
301 | cd0544ee | Stefan Weil | {"dynticks", win32_start_timer, win32_stop_timer, win32_rearm_timer},
|
302 | cd0544ee | Stefan Weil | {"win32", win32_start_timer, win32_stop_timer, NULL}, |
303 | db1a4972 | Paolo Bonzini | #endif
|
304 | db1a4972 | Paolo Bonzini | {NULL, }
|
305 | db1a4972 | Paolo Bonzini | }; |
306 | db1a4972 | Paolo Bonzini | |
307 | db1a4972 | Paolo Bonzini | static void show_available_alarms(void) |
308 | db1a4972 | Paolo Bonzini | { |
309 | db1a4972 | Paolo Bonzini | int i;
|
310 | db1a4972 | Paolo Bonzini | |
311 | db1a4972 | Paolo Bonzini | printf("Available alarm timers, in order of precedence:\n");
|
312 | db1a4972 | Paolo Bonzini | for (i = 0; alarm_timers[i].name; i++) |
313 | db1a4972 | Paolo Bonzini | printf("%s\n", alarm_timers[i].name);
|
314 | db1a4972 | Paolo Bonzini | } |
315 | db1a4972 | Paolo Bonzini | |
316 | db1a4972 | Paolo Bonzini | void configure_alarms(char const *opt) |
317 | db1a4972 | Paolo Bonzini | { |
318 | db1a4972 | Paolo Bonzini | int i;
|
319 | db1a4972 | Paolo Bonzini | int cur = 0; |
320 | db1a4972 | Paolo Bonzini | int count = ARRAY_SIZE(alarm_timers) - 1; |
321 | db1a4972 | Paolo Bonzini | char *arg;
|
322 | db1a4972 | Paolo Bonzini | char *name;
|
323 | db1a4972 | Paolo Bonzini | struct qemu_alarm_timer tmp;
|
324 | db1a4972 | Paolo Bonzini | |
325 | db1a4972 | Paolo Bonzini | if (!strcmp(opt, "?")) { |
326 | db1a4972 | Paolo Bonzini | show_available_alarms(); |
327 | db1a4972 | Paolo Bonzini | exit(0);
|
328 | db1a4972 | Paolo Bonzini | } |
329 | db1a4972 | Paolo Bonzini | |
330 | db1a4972 | Paolo Bonzini | arg = qemu_strdup(opt); |
331 | db1a4972 | Paolo Bonzini | |
332 | db1a4972 | Paolo Bonzini | /* Reorder the array */
|
333 | db1a4972 | Paolo Bonzini | name = strtok(arg, ",");
|
334 | db1a4972 | Paolo Bonzini | while (name) {
|
335 | db1a4972 | Paolo Bonzini | for (i = 0; i < count && alarm_timers[i].name; i++) { |
336 | db1a4972 | Paolo Bonzini | if (!strcmp(alarm_timers[i].name, name))
|
337 | db1a4972 | Paolo Bonzini | break;
|
338 | db1a4972 | Paolo Bonzini | } |
339 | db1a4972 | Paolo Bonzini | |
340 | db1a4972 | Paolo Bonzini | if (i == count) {
|
341 | db1a4972 | Paolo Bonzini | fprintf(stderr, "Unknown clock %s\n", name);
|
342 | db1a4972 | Paolo Bonzini | goto next;
|
343 | db1a4972 | Paolo Bonzini | } |
344 | db1a4972 | Paolo Bonzini | |
345 | db1a4972 | Paolo Bonzini | if (i < cur)
|
346 | db1a4972 | Paolo Bonzini | /* Ignore */
|
347 | db1a4972 | Paolo Bonzini | goto next;
|
348 | db1a4972 | Paolo Bonzini | |
349 | db1a4972 | Paolo Bonzini | /* Swap */
|
350 | db1a4972 | Paolo Bonzini | tmp = alarm_timers[i]; |
351 | db1a4972 | Paolo Bonzini | alarm_timers[i] = alarm_timers[cur]; |
352 | db1a4972 | Paolo Bonzini | alarm_timers[cur] = tmp; |
353 | db1a4972 | Paolo Bonzini | |
354 | db1a4972 | Paolo Bonzini | cur++; |
355 | db1a4972 | Paolo Bonzini | next:
|
356 | db1a4972 | Paolo Bonzini | name = strtok(NULL, ","); |
357 | db1a4972 | Paolo Bonzini | } |
358 | db1a4972 | Paolo Bonzini | |
359 | db1a4972 | Paolo Bonzini | qemu_free(arg); |
360 | db1a4972 | Paolo Bonzini | |
361 | db1a4972 | Paolo Bonzini | if (cur) {
|
362 | db1a4972 | Paolo Bonzini | /* Disable remaining timers */
|
363 | db1a4972 | Paolo Bonzini | for (i = cur; i < count; i++)
|
364 | db1a4972 | Paolo Bonzini | alarm_timers[i].name = NULL;
|
365 | db1a4972 | Paolo Bonzini | } else {
|
366 | db1a4972 | Paolo Bonzini | show_available_alarms(); |
367 | db1a4972 | Paolo Bonzini | exit(1);
|
368 | db1a4972 | Paolo Bonzini | } |
369 | db1a4972 | Paolo Bonzini | } |
370 | db1a4972 | Paolo Bonzini | |
371 | db1a4972 | Paolo Bonzini | #define QEMU_NUM_CLOCKS 3 |
372 | db1a4972 | Paolo Bonzini | |
373 | db1a4972 | Paolo Bonzini | QEMUClock *rt_clock; |
374 | db1a4972 | Paolo Bonzini | QEMUClock *vm_clock; |
375 | db1a4972 | Paolo Bonzini | QEMUClock *host_clock; |
376 | db1a4972 | Paolo Bonzini | |
377 | db1a4972 | Paolo Bonzini | static QEMUTimer *active_timers[QEMU_NUM_CLOCKS];
|
378 | db1a4972 | Paolo Bonzini | |
379 | db1a4972 | Paolo Bonzini | static QEMUClock *qemu_new_clock(int type) |
380 | db1a4972 | Paolo Bonzini | { |
381 | db1a4972 | Paolo Bonzini | QEMUClock *clock; |
382 | 691a0c9c | Jan Kiszka | |
383 | db1a4972 | Paolo Bonzini | clock = qemu_mallocz(sizeof(QEMUClock));
|
384 | db1a4972 | Paolo Bonzini | clock->type = type; |
385 | db1a4972 | Paolo Bonzini | clock->enabled = 1;
|
386 | 691a0c9c | Jan Kiszka | notifier_list_init(&clock->reset_notifiers); |
387 | 691a0c9c | Jan Kiszka | /* required to detect & report backward jumps */
|
388 | 691a0c9c | Jan Kiszka | if (type == QEMU_CLOCK_HOST) {
|
389 | 691a0c9c | Jan Kiszka | clock->last = get_clock_realtime(); |
390 | 691a0c9c | Jan Kiszka | } |
391 | db1a4972 | Paolo Bonzini | return clock;
|
392 | db1a4972 | Paolo Bonzini | } |
393 | db1a4972 | Paolo Bonzini | |
394 | db1a4972 | Paolo Bonzini | void qemu_clock_enable(QEMUClock *clock, int enabled) |
395 | db1a4972 | Paolo Bonzini | { |
396 | db1a4972 | Paolo Bonzini | clock->enabled = enabled; |
397 | db1a4972 | Paolo Bonzini | } |
398 | db1a4972 | Paolo Bonzini | |
399 | ab33fcda | Paolo Bonzini | static int64_t vm_clock_warp_start;
|
400 | ab33fcda | Paolo Bonzini | |
401 | ab33fcda | Paolo Bonzini | static void icount_warp_rt(void *opaque) |
402 | ab33fcda | Paolo Bonzini | { |
403 | ab33fcda | Paolo Bonzini | if (vm_clock_warp_start == -1) { |
404 | ab33fcda | Paolo Bonzini | return;
|
405 | ab33fcda | Paolo Bonzini | } |
406 | ab33fcda | Paolo Bonzini | |
407 | ab33fcda | Paolo Bonzini | if (vm_running) {
|
408 | ab33fcda | Paolo Bonzini | int64_t clock = qemu_get_clock_ns(rt_clock); |
409 | ab33fcda | Paolo Bonzini | int64_t warp_delta = clock - vm_clock_warp_start; |
410 | ab33fcda | Paolo Bonzini | if (use_icount == 1) { |
411 | ab33fcda | Paolo Bonzini | qemu_icount_bias += warp_delta; |
412 | ab33fcda | Paolo Bonzini | } else {
|
413 | ab33fcda | Paolo Bonzini | /*
|
414 | ab33fcda | Paolo Bonzini | * In adaptive mode, do not let the vm_clock run too
|
415 | ab33fcda | Paolo Bonzini | * far ahead of real time.
|
416 | ab33fcda | Paolo Bonzini | */
|
417 | ab33fcda | Paolo Bonzini | int64_t cur_time = cpu_get_clock(); |
418 | ab33fcda | Paolo Bonzini | int64_t cur_icount = qemu_get_clock_ns(vm_clock); |
419 | ab33fcda | Paolo Bonzini | int64_t delta = cur_time - cur_icount; |
420 | ab33fcda | Paolo Bonzini | qemu_icount_bias += MIN(warp_delta, delta); |
421 | ab33fcda | Paolo Bonzini | } |
422 | ab33fcda | Paolo Bonzini | if (qemu_timer_expired(active_timers[QEMU_CLOCK_VIRTUAL],
|
423 | ab33fcda | Paolo Bonzini | qemu_get_clock_ns(vm_clock))) { |
424 | ab33fcda | Paolo Bonzini | qemu_notify_event(); |
425 | ab33fcda | Paolo Bonzini | } |
426 | ab33fcda | Paolo Bonzini | } |
427 | ab33fcda | Paolo Bonzini | vm_clock_warp_start = -1;
|
428 | ab33fcda | Paolo Bonzini | } |
429 | ab33fcda | Paolo Bonzini | |
430 | ab33fcda | Paolo Bonzini | void qemu_clock_warp(QEMUClock *clock)
|
431 | ab33fcda | Paolo Bonzini | { |
432 | ab33fcda | Paolo Bonzini | int64_t deadline; |
433 | ab33fcda | Paolo Bonzini | |
434 | ab33fcda | Paolo Bonzini | if (!clock->warp_timer) {
|
435 | ab33fcda | Paolo Bonzini | return;
|
436 | ab33fcda | Paolo Bonzini | } |
437 | ab33fcda | Paolo Bonzini | |
438 | ab33fcda | Paolo Bonzini | /*
|
439 | ab33fcda | Paolo Bonzini | * There are too many global variables to make the "warp" behavior
|
440 | ab33fcda | Paolo Bonzini | * applicable to other clocks. But a clock argument removes the
|
441 | ab33fcda | Paolo Bonzini | * need for if statements all over the place.
|
442 | ab33fcda | Paolo Bonzini | */
|
443 | ab33fcda | Paolo Bonzini | assert(clock == vm_clock); |
444 | ab33fcda | Paolo Bonzini | |
445 | ab33fcda | Paolo Bonzini | /*
|
446 | ab33fcda | Paolo Bonzini | * If the CPUs have been sleeping, advance the vm_clock timer now. This
|
447 | ab33fcda | Paolo Bonzini | * ensures that the deadline for the timer is computed correctly below.
|
448 | ab33fcda | Paolo Bonzini | * This also makes sure that the insn counter is synchronized before the
|
449 | ab33fcda | Paolo Bonzini | * CPU starts running, in case the CPU is woken by an event other than
|
450 | ab33fcda | Paolo Bonzini | * the earliest vm_clock timer.
|
451 | ab33fcda | Paolo Bonzini | */
|
452 | ab33fcda | Paolo Bonzini | icount_warp_rt(NULL);
|
453 | ab33fcda | Paolo Bonzini | if (!all_cpu_threads_idle() || !active_timers[clock->type]) {
|
454 | ab33fcda | Paolo Bonzini | qemu_del_timer(clock->warp_timer); |
455 | ab33fcda | Paolo Bonzini | return;
|
456 | ab33fcda | Paolo Bonzini | } |
457 | ab33fcda | Paolo Bonzini | |
458 | ab33fcda | Paolo Bonzini | vm_clock_warp_start = qemu_get_clock_ns(rt_clock); |
459 | cb842c90 | Paolo Bonzini | deadline = qemu_next_icount_deadline(); |
460 | ab33fcda | Paolo Bonzini | if (deadline > 0) { |
461 | ab33fcda | Paolo Bonzini | /*
|
462 | ab33fcda | Paolo Bonzini | * Ensure the vm_clock proceeds even when the virtual CPU goes to
|
463 | ab33fcda | Paolo Bonzini | * sleep. Otherwise, the CPU might be waiting for a future timer
|
464 | ab33fcda | Paolo Bonzini | * interrupt to wake it up, but the interrupt never comes because
|
465 | ab33fcda | Paolo Bonzini | * the vCPU isn't running any insns and thus doesn't advance the
|
466 | ab33fcda | Paolo Bonzini | * vm_clock.
|
467 | ab33fcda | Paolo Bonzini | *
|
468 | ab33fcda | Paolo Bonzini | * An extreme solution for this problem would be to never let VCPUs
|
469 | ab33fcda | Paolo Bonzini | * sleep in icount mode if there is a pending vm_clock timer; rather
|
470 | ab33fcda | Paolo Bonzini | * time could just advance to the next vm_clock event. Instead, we
|
471 | ab33fcda | Paolo Bonzini | * do stop VCPUs and only advance vm_clock after some "real" time,
|
472 | ab33fcda | Paolo Bonzini | * (related to the time left until the next event) has passed. This
|
473 | ab33fcda | Paolo Bonzini | * rt_clock timer will do this. This avoids that the warps are too
|
474 | ab33fcda | Paolo Bonzini | * visible externally---for example, you will not be sending network
|
475 | ab33fcda | Paolo Bonzini | * packets continously instead of every 100ms.
|
476 | ab33fcda | Paolo Bonzini | */
|
477 | ab33fcda | Paolo Bonzini | qemu_mod_timer(clock->warp_timer, vm_clock_warp_start + deadline); |
478 | ab33fcda | Paolo Bonzini | } else {
|
479 | ab33fcda | Paolo Bonzini | qemu_notify_event(); |
480 | ab33fcda | Paolo Bonzini | } |
481 | ab33fcda | Paolo Bonzini | } |
482 | ab33fcda | Paolo Bonzini | |
483 | 4a998740 | Paolo Bonzini | QEMUTimer *qemu_new_timer(QEMUClock *clock, int scale,
|
484 | 4a998740 | Paolo Bonzini | QEMUTimerCB *cb, void *opaque)
|
485 | db1a4972 | Paolo Bonzini | { |
486 | db1a4972 | Paolo Bonzini | QEMUTimer *ts; |
487 | db1a4972 | Paolo Bonzini | |
488 | db1a4972 | Paolo Bonzini | ts = qemu_mallocz(sizeof(QEMUTimer));
|
489 | db1a4972 | Paolo Bonzini | ts->clock = clock; |
490 | db1a4972 | Paolo Bonzini | ts->cb = cb; |
491 | db1a4972 | Paolo Bonzini | ts->opaque = opaque; |
492 | 4a998740 | Paolo Bonzini | ts->scale = scale; |
493 | db1a4972 | Paolo Bonzini | return ts;
|
494 | db1a4972 | Paolo Bonzini | } |
495 | db1a4972 | Paolo Bonzini | |
496 | db1a4972 | Paolo Bonzini | void qemu_free_timer(QEMUTimer *ts)
|
497 | db1a4972 | Paolo Bonzini | { |
498 | db1a4972 | Paolo Bonzini | qemu_free(ts); |
499 | db1a4972 | Paolo Bonzini | } |
500 | db1a4972 | Paolo Bonzini | |
501 | db1a4972 | Paolo Bonzini | /* stop a timer, but do not dealloc it */
|
502 | db1a4972 | Paolo Bonzini | void qemu_del_timer(QEMUTimer *ts)
|
503 | db1a4972 | Paolo Bonzini | { |
504 | db1a4972 | Paolo Bonzini | QEMUTimer **pt, *t; |
505 | db1a4972 | Paolo Bonzini | |
506 | db1a4972 | Paolo Bonzini | /* NOTE: this code must be signal safe because
|
507 | db1a4972 | Paolo Bonzini | qemu_timer_expired() can be called from a signal. */
|
508 | db1a4972 | Paolo Bonzini | pt = &active_timers[ts->clock->type]; |
509 | db1a4972 | Paolo Bonzini | for(;;) {
|
510 | db1a4972 | Paolo Bonzini | t = *pt; |
511 | db1a4972 | Paolo Bonzini | if (!t)
|
512 | db1a4972 | Paolo Bonzini | break;
|
513 | db1a4972 | Paolo Bonzini | if (t == ts) {
|
514 | db1a4972 | Paolo Bonzini | *pt = t->next; |
515 | db1a4972 | Paolo Bonzini | break;
|
516 | db1a4972 | Paolo Bonzini | } |
517 | db1a4972 | Paolo Bonzini | pt = &t->next; |
518 | db1a4972 | Paolo Bonzini | } |
519 | db1a4972 | Paolo Bonzini | } |
520 | db1a4972 | Paolo Bonzini | |
521 | db1a4972 | Paolo Bonzini | /* modify the current timer so that it will be fired when current_time
|
522 | db1a4972 | Paolo Bonzini | >= expire_time. The corresponding callback will be called. */
|
523 | 4a998740 | Paolo Bonzini | static void qemu_mod_timer_ns(QEMUTimer *ts, int64_t expire_time) |
524 | db1a4972 | Paolo Bonzini | { |
525 | db1a4972 | Paolo Bonzini | QEMUTimer **pt, *t; |
526 | db1a4972 | Paolo Bonzini | |
527 | db1a4972 | Paolo Bonzini | qemu_del_timer(ts); |
528 | db1a4972 | Paolo Bonzini | |
529 | db1a4972 | Paolo Bonzini | /* add the timer in the sorted list */
|
530 | db1a4972 | Paolo Bonzini | /* NOTE: this code must be signal safe because
|
531 | db1a4972 | Paolo Bonzini | qemu_timer_expired() can be called from a signal. */
|
532 | db1a4972 | Paolo Bonzini | pt = &active_timers[ts->clock->type]; |
533 | db1a4972 | Paolo Bonzini | for(;;) {
|
534 | db1a4972 | Paolo Bonzini | t = *pt; |
535 | 45c7b37f | Stefan Weil | if (!qemu_timer_expired_ns(t, expire_time)) {
|
536 | db1a4972 | Paolo Bonzini | break;
|
537 | 45c7b37f | Stefan Weil | } |
538 | db1a4972 | Paolo Bonzini | pt = &t->next; |
539 | db1a4972 | Paolo Bonzini | } |
540 | db1a4972 | Paolo Bonzini | ts->expire_time = expire_time; |
541 | db1a4972 | Paolo Bonzini | ts->next = *pt; |
542 | db1a4972 | Paolo Bonzini | *pt = ts; |
543 | db1a4972 | Paolo Bonzini | |
544 | db1a4972 | Paolo Bonzini | /* Rearm if necessary */
|
545 | db1a4972 | Paolo Bonzini | if (pt == &active_timers[ts->clock->type]) {
|
546 | db1a4972 | Paolo Bonzini | if (!alarm_timer->pending) {
|
547 | db1a4972 | Paolo Bonzini | qemu_rearm_alarm_timer(alarm_timer); |
548 | db1a4972 | Paolo Bonzini | } |
549 | db1a4972 | Paolo Bonzini | /* Interrupt execution to force deadline recalculation. */
|
550 | ab33fcda | Paolo Bonzini | qemu_clock_warp(ts->clock); |
551 | ab33fcda | Paolo Bonzini | if (use_icount) {
|
552 | db1a4972 | Paolo Bonzini | qemu_notify_event(); |
553 | ab33fcda | Paolo Bonzini | } |
554 | db1a4972 | Paolo Bonzini | } |
555 | db1a4972 | Paolo Bonzini | } |
556 | db1a4972 | Paolo Bonzini | |
557 | 4a998740 | Paolo Bonzini | /* modify the current timer so that it will be fired when current_time
|
558 | 4a998740 | Paolo Bonzini | >= expire_time. The corresponding callback will be called. */
|
559 | 4a998740 | Paolo Bonzini | void qemu_mod_timer(QEMUTimer *ts, int64_t expire_time)
|
560 | 4a998740 | Paolo Bonzini | { |
561 | 4a998740 | Paolo Bonzini | qemu_mod_timer_ns(ts, expire_time * ts->scale); |
562 | 4a998740 | Paolo Bonzini | } |
563 | 4a998740 | Paolo Bonzini | |
564 | db1a4972 | Paolo Bonzini | int qemu_timer_pending(QEMUTimer *ts)
|
565 | db1a4972 | Paolo Bonzini | { |
566 | db1a4972 | Paolo Bonzini | QEMUTimer *t; |
567 | db1a4972 | Paolo Bonzini | for(t = active_timers[ts->clock->type]; t != NULL; t = t->next) { |
568 | db1a4972 | Paolo Bonzini | if (t == ts)
|
569 | db1a4972 | Paolo Bonzini | return 1; |
570 | db1a4972 | Paolo Bonzini | } |
571 | db1a4972 | Paolo Bonzini | return 0; |
572 | db1a4972 | Paolo Bonzini | } |
573 | db1a4972 | Paolo Bonzini | |
574 | db1a4972 | Paolo Bonzini | int qemu_timer_expired(QEMUTimer *timer_head, int64_t current_time)
|
575 | db1a4972 | Paolo Bonzini | { |
576 | 45c7b37f | Stefan Weil | return qemu_timer_expired_ns(timer_head, current_time * timer_head->scale);
|
577 | db1a4972 | Paolo Bonzini | } |
578 | db1a4972 | Paolo Bonzini | |
579 | db1a4972 | Paolo Bonzini | static void qemu_run_timers(QEMUClock *clock) |
580 | db1a4972 | Paolo Bonzini | { |
581 | db1a4972 | Paolo Bonzini | QEMUTimer **ptimer_head, *ts; |
582 | db1a4972 | Paolo Bonzini | int64_t current_time; |
583 | db1a4972 | Paolo Bonzini | |
584 | db1a4972 | Paolo Bonzini | if (!clock->enabled)
|
585 | db1a4972 | Paolo Bonzini | return;
|
586 | db1a4972 | Paolo Bonzini | |
587 | 4a998740 | Paolo Bonzini | current_time = qemu_get_clock_ns(clock); |
588 | db1a4972 | Paolo Bonzini | ptimer_head = &active_timers[clock->type]; |
589 | db1a4972 | Paolo Bonzini | for(;;) {
|
590 | db1a4972 | Paolo Bonzini | ts = *ptimer_head; |
591 | 45c7b37f | Stefan Weil | if (!qemu_timer_expired_ns(ts, current_time)) {
|
592 | db1a4972 | Paolo Bonzini | break;
|
593 | 45c7b37f | Stefan Weil | } |
594 | db1a4972 | Paolo Bonzini | /* remove timer from the list before calling the callback */
|
595 | db1a4972 | Paolo Bonzini | *ptimer_head = ts->next; |
596 | db1a4972 | Paolo Bonzini | ts->next = NULL;
|
597 | db1a4972 | Paolo Bonzini | |
598 | db1a4972 | Paolo Bonzini | /* run the callback (the timer list can be modified) */
|
599 | db1a4972 | Paolo Bonzini | ts->cb(ts->opaque); |
600 | db1a4972 | Paolo Bonzini | } |
601 | db1a4972 | Paolo Bonzini | } |
602 | db1a4972 | Paolo Bonzini | |
603 | db1a4972 | Paolo Bonzini | int64_t qemu_get_clock_ns(QEMUClock *clock) |
604 | db1a4972 | Paolo Bonzini | { |
605 | 691a0c9c | Jan Kiszka | int64_t now, last; |
606 | 691a0c9c | Jan Kiszka | |
607 | db1a4972 | Paolo Bonzini | switch(clock->type) {
|
608 | db1a4972 | Paolo Bonzini | case QEMU_CLOCK_REALTIME:
|
609 | db1a4972 | Paolo Bonzini | return get_clock();
|
610 | db1a4972 | Paolo Bonzini | default:
|
611 | db1a4972 | Paolo Bonzini | case QEMU_CLOCK_VIRTUAL:
|
612 | db1a4972 | Paolo Bonzini | if (use_icount) {
|
613 | db1a4972 | Paolo Bonzini | return cpu_get_icount();
|
614 | db1a4972 | Paolo Bonzini | } else {
|
615 | db1a4972 | Paolo Bonzini | return cpu_get_clock();
|
616 | db1a4972 | Paolo Bonzini | } |
617 | db1a4972 | Paolo Bonzini | case QEMU_CLOCK_HOST:
|
618 | 691a0c9c | Jan Kiszka | now = get_clock_realtime(); |
619 | 691a0c9c | Jan Kiszka | last = clock->last; |
620 | 691a0c9c | Jan Kiszka | clock->last = now; |
621 | 691a0c9c | Jan Kiszka | if (now < last) {
|
622 | 691a0c9c | Jan Kiszka | notifier_list_notify(&clock->reset_notifiers, &now); |
623 | 691a0c9c | Jan Kiszka | } |
624 | 691a0c9c | Jan Kiszka | return now;
|
625 | db1a4972 | Paolo Bonzini | } |
626 | db1a4972 | Paolo Bonzini | } |
627 | db1a4972 | Paolo Bonzini | |
628 | 691a0c9c | Jan Kiszka | void qemu_register_clock_reset_notifier(QEMUClock *clock, Notifier *notifier)
|
629 | 691a0c9c | Jan Kiszka | { |
630 | 691a0c9c | Jan Kiszka | notifier_list_add(&clock->reset_notifiers, notifier); |
631 | 691a0c9c | Jan Kiszka | } |
632 | 691a0c9c | Jan Kiszka | |
633 | 691a0c9c | Jan Kiszka | void qemu_unregister_clock_reset_notifier(QEMUClock *clock, Notifier *notifier)
|
634 | 691a0c9c | Jan Kiszka | { |
635 | 691a0c9c | Jan Kiszka | notifier_list_remove(&clock->reset_notifiers, notifier); |
636 | 691a0c9c | Jan Kiszka | } |
637 | 691a0c9c | Jan Kiszka | |
638 | db1a4972 | Paolo Bonzini | void init_clocks(void) |
639 | db1a4972 | Paolo Bonzini | { |
640 | db1a4972 | Paolo Bonzini | rt_clock = qemu_new_clock(QEMU_CLOCK_REALTIME); |
641 | db1a4972 | Paolo Bonzini | vm_clock = qemu_new_clock(QEMU_CLOCK_VIRTUAL); |
642 | db1a4972 | Paolo Bonzini | host_clock = qemu_new_clock(QEMU_CLOCK_HOST); |
643 | db1a4972 | Paolo Bonzini | |
644 | db1a4972 | Paolo Bonzini | rtc_clock = host_clock; |
645 | db1a4972 | Paolo Bonzini | } |
646 | db1a4972 | Paolo Bonzini | |
647 | db1a4972 | Paolo Bonzini | /* save a timer */
|
648 | db1a4972 | Paolo Bonzini | void qemu_put_timer(QEMUFile *f, QEMUTimer *ts)
|
649 | db1a4972 | Paolo Bonzini | { |
650 | db1a4972 | Paolo Bonzini | uint64_t expire_time; |
651 | db1a4972 | Paolo Bonzini | |
652 | db1a4972 | Paolo Bonzini | if (qemu_timer_pending(ts)) {
|
653 | db1a4972 | Paolo Bonzini | expire_time = ts->expire_time; |
654 | db1a4972 | Paolo Bonzini | } else {
|
655 | db1a4972 | Paolo Bonzini | expire_time = -1;
|
656 | db1a4972 | Paolo Bonzini | } |
657 | db1a4972 | Paolo Bonzini | qemu_put_be64(f, expire_time); |
658 | db1a4972 | Paolo Bonzini | } |
659 | db1a4972 | Paolo Bonzini | |
660 | db1a4972 | Paolo Bonzini | void qemu_get_timer(QEMUFile *f, QEMUTimer *ts)
|
661 | db1a4972 | Paolo Bonzini | { |
662 | db1a4972 | Paolo Bonzini | uint64_t expire_time; |
663 | db1a4972 | Paolo Bonzini | |
664 | db1a4972 | Paolo Bonzini | expire_time = qemu_get_be64(f); |
665 | db1a4972 | Paolo Bonzini | if (expire_time != -1) { |
666 | 4a998740 | Paolo Bonzini | qemu_mod_timer_ns(ts, expire_time); |
667 | db1a4972 | Paolo Bonzini | } else {
|
668 | db1a4972 | Paolo Bonzini | qemu_del_timer(ts); |
669 | db1a4972 | Paolo Bonzini | } |
670 | db1a4972 | Paolo Bonzini | } |
671 | db1a4972 | Paolo Bonzini | |
672 | db1a4972 | Paolo Bonzini | static const VMStateDescription vmstate_timers = { |
673 | db1a4972 | Paolo Bonzini | .name = "timer",
|
674 | db1a4972 | Paolo Bonzini | .version_id = 2,
|
675 | db1a4972 | Paolo Bonzini | .minimum_version_id = 1,
|
676 | db1a4972 | Paolo Bonzini | .minimum_version_id_old = 1,
|
677 | db1a4972 | Paolo Bonzini | .fields = (VMStateField []) { |
678 | db1a4972 | Paolo Bonzini | VMSTATE_INT64(cpu_ticks_offset, TimersState), |
679 | db1a4972 | Paolo Bonzini | VMSTATE_INT64(dummy, TimersState), |
680 | db1a4972 | Paolo Bonzini | VMSTATE_INT64_V(cpu_clock_offset, TimersState, 2),
|
681 | db1a4972 | Paolo Bonzini | VMSTATE_END_OF_LIST() |
682 | db1a4972 | Paolo Bonzini | } |
683 | db1a4972 | Paolo Bonzini | }; |
684 | db1a4972 | Paolo Bonzini | |
685 | db1a4972 | Paolo Bonzini | void configure_icount(const char *option) |
686 | db1a4972 | Paolo Bonzini | { |
687 | 0be71e32 | Alex Williamson | vmstate_register(NULL, 0, &vmstate_timers, &timers_state); |
688 | db1a4972 | Paolo Bonzini | if (!option)
|
689 | db1a4972 | Paolo Bonzini | return;
|
690 | db1a4972 | Paolo Bonzini | |
691 | ab33fcda | Paolo Bonzini | #ifdef CONFIG_IOTHREAD
|
692 | ab33fcda | Paolo Bonzini | vm_clock->warp_timer = qemu_new_timer_ns(rt_clock, icount_warp_rt, NULL);
|
693 | ab33fcda | Paolo Bonzini | #endif
|
694 | ab33fcda | Paolo Bonzini | |
695 | db1a4972 | Paolo Bonzini | if (strcmp(option, "auto") != 0) { |
696 | db1a4972 | Paolo Bonzini | icount_time_shift = strtol(option, NULL, 0); |
697 | db1a4972 | Paolo Bonzini | use_icount = 1;
|
698 | db1a4972 | Paolo Bonzini | return;
|
699 | db1a4972 | Paolo Bonzini | } |
700 | db1a4972 | Paolo Bonzini | |
701 | db1a4972 | Paolo Bonzini | use_icount = 2;
|
702 | db1a4972 | Paolo Bonzini | |
703 | db1a4972 | Paolo Bonzini | /* 125MIPS seems a reasonable initial guess at the guest speed.
|
704 | db1a4972 | Paolo Bonzini | It will be corrected fairly quickly anyway. */
|
705 | db1a4972 | Paolo Bonzini | icount_time_shift = 3;
|
706 | db1a4972 | Paolo Bonzini | |
707 | db1a4972 | Paolo Bonzini | /* Have both realtime and virtual time triggers for speed adjustment.
|
708 | db1a4972 | Paolo Bonzini | The realtime trigger catches emulated time passing too slowly,
|
709 | db1a4972 | Paolo Bonzini | the virtual time trigger catches emulated time passing too fast.
|
710 | db1a4972 | Paolo Bonzini | Realtime triggers occur even when idle, so use them less frequently
|
711 | db1a4972 | Paolo Bonzini | than VM triggers. */
|
712 | 7bd427d8 | Paolo Bonzini | icount_rt_timer = qemu_new_timer_ms(rt_clock, icount_adjust_rt, NULL);
|
713 | db1a4972 | Paolo Bonzini | qemu_mod_timer(icount_rt_timer, |
714 | 7bd427d8 | Paolo Bonzini | qemu_get_clock_ms(rt_clock) + 1000);
|
715 | 74475455 | Paolo Bonzini | icount_vm_timer = qemu_new_timer_ns(vm_clock, icount_adjust_vm, NULL);
|
716 | db1a4972 | Paolo Bonzini | qemu_mod_timer(icount_vm_timer, |
717 | 74475455 | Paolo Bonzini | qemu_get_clock_ns(vm_clock) + get_ticks_per_sec() / 10);
|
718 | db1a4972 | Paolo Bonzini | } |
719 | db1a4972 | Paolo Bonzini | |
720 | db1a4972 | Paolo Bonzini | void qemu_run_all_timers(void) |
721 | db1a4972 | Paolo Bonzini | { |
722 | ca5a2a4b | Paolo Bonzini | alarm_timer->pending = 0;
|
723 | ca5a2a4b | Paolo Bonzini | |
724 | db1a4972 | Paolo Bonzini | /* rearm timer, if not periodic */
|
725 | db1a4972 | Paolo Bonzini | if (alarm_timer->expired) {
|
726 | db1a4972 | Paolo Bonzini | alarm_timer->expired = 0;
|
727 | db1a4972 | Paolo Bonzini | qemu_rearm_alarm_timer(alarm_timer); |
728 | db1a4972 | Paolo Bonzini | } |
729 | db1a4972 | Paolo Bonzini | |
730 | db1a4972 | Paolo Bonzini | /* vm time timers */
|
731 | db1a4972 | Paolo Bonzini | if (vm_running) {
|
732 | db1a4972 | Paolo Bonzini | qemu_run_timers(vm_clock); |
733 | db1a4972 | Paolo Bonzini | } |
734 | db1a4972 | Paolo Bonzini | |
735 | db1a4972 | Paolo Bonzini | qemu_run_timers(rt_clock); |
736 | db1a4972 | Paolo Bonzini | qemu_run_timers(host_clock); |
737 | db1a4972 | Paolo Bonzini | } |
738 | db1a4972 | Paolo Bonzini | |
739 | 4c3d45eb | Paolo Bonzini | static int64_t qemu_next_alarm_deadline(void); |
740 | 4c3d45eb | Paolo Bonzini | |
741 | db1a4972 | Paolo Bonzini | #ifdef _WIN32
|
742 | 68c23e55 | Paolo Bonzini | static void CALLBACK host_alarm_handler(PVOID lpParam, BOOLEAN unused) |
743 | db1a4972 | Paolo Bonzini | #else
|
744 | db1a4972 | Paolo Bonzini | static void host_alarm_handler(int host_signum) |
745 | db1a4972 | Paolo Bonzini | #endif
|
746 | db1a4972 | Paolo Bonzini | { |
747 | db1a4972 | Paolo Bonzini | struct qemu_alarm_timer *t = alarm_timer;
|
748 | db1a4972 | Paolo Bonzini | if (!t)
|
749 | db1a4972 | Paolo Bonzini | return;
|
750 | db1a4972 | Paolo Bonzini | |
751 | db1a4972 | Paolo Bonzini | #if 0
|
752 | db1a4972 | Paolo Bonzini | #define DISP_FREQ 1000
|
753 | db1a4972 | Paolo Bonzini | {
|
754 | db1a4972 | Paolo Bonzini | static int64_t delta_min = INT64_MAX;
|
755 | db1a4972 | Paolo Bonzini | static int64_t delta_max, delta_cum, last_clock, delta, ti;
|
756 | db1a4972 | Paolo Bonzini | static int count;
|
757 | 74475455 | Paolo Bonzini | ti = qemu_get_clock_ns(vm_clock);
|
758 | db1a4972 | Paolo Bonzini | if (last_clock != 0) {
|
759 | db1a4972 | Paolo Bonzini | delta = ti - last_clock;
|
760 | db1a4972 | Paolo Bonzini | if (delta < delta_min)
|
761 | db1a4972 | Paolo Bonzini | delta_min = delta;
|
762 | db1a4972 | Paolo Bonzini | if (delta > delta_max)
|
763 | db1a4972 | Paolo Bonzini | delta_max = delta;
|
764 | db1a4972 | Paolo Bonzini | delta_cum += delta;
|
765 | db1a4972 | Paolo Bonzini | if (++count == DISP_FREQ) {
|
766 | db1a4972 | Paolo Bonzini | printf("timer: min=%" PRId64 " us max=%" PRId64 " us avg=%" PRId64 " us avg_freq=%0.3f Hz\n",
|
767 | db1a4972 | Paolo Bonzini | muldiv64(delta_min, 1000000, get_ticks_per_sec()),
|
768 | db1a4972 | Paolo Bonzini | muldiv64(delta_max, 1000000, get_ticks_per_sec()),
|
769 | db1a4972 | Paolo Bonzini | muldiv64(delta_cum, 1000000 / DISP_FREQ, get_ticks_per_sec()),
|
770 | db1a4972 | Paolo Bonzini | (double)get_ticks_per_sec() / ((double)delta_cum / DISP_FREQ));
|
771 | db1a4972 | Paolo Bonzini | count = 0;
|
772 | db1a4972 | Paolo Bonzini | delta_min = INT64_MAX;
|
773 | db1a4972 | Paolo Bonzini | delta_max = 0;
|
774 | db1a4972 | Paolo Bonzini | delta_cum = 0;
|
775 | db1a4972 | Paolo Bonzini | }
|
776 | db1a4972 | Paolo Bonzini | }
|
777 | db1a4972 | Paolo Bonzini | last_clock = ti;
|
778 | db1a4972 | Paolo Bonzini | }
|
779 | db1a4972 | Paolo Bonzini | #endif
|
780 | db1a4972 | Paolo Bonzini | if (alarm_has_dynticks(t) ||
|
781 | 4c3d45eb | Paolo Bonzini | qemu_next_alarm_deadline () <= 0) {
|
782 | db1a4972 | Paolo Bonzini | t->expired = alarm_has_dynticks(t); |
783 | db1a4972 | Paolo Bonzini | t->pending = 1;
|
784 | db1a4972 | Paolo Bonzini | qemu_notify_event(); |
785 | db1a4972 | Paolo Bonzini | } |
786 | db1a4972 | Paolo Bonzini | } |
787 | db1a4972 | Paolo Bonzini | |
788 | cb842c90 | Paolo Bonzini | int64_t qemu_next_icount_deadline(void)
|
789 | db1a4972 | Paolo Bonzini | { |
790 | db1a4972 | Paolo Bonzini | /* To avoid problems with overflow limit this to 2^32. */
|
791 | db1a4972 | Paolo Bonzini | int64_t delta = INT32_MAX; |
792 | db1a4972 | Paolo Bonzini | |
793 | cb842c90 | Paolo Bonzini | assert(use_icount); |
794 | db1a4972 | Paolo Bonzini | if (active_timers[QEMU_CLOCK_VIRTUAL]) {
|
795 | db1a4972 | Paolo Bonzini | delta = active_timers[QEMU_CLOCK_VIRTUAL]->expire_time - |
796 | 9c13246a | Paolo Bonzini | qemu_get_clock_ns(vm_clock); |
797 | db1a4972 | Paolo Bonzini | } |
798 | db1a4972 | Paolo Bonzini | |
799 | db1a4972 | Paolo Bonzini | if (delta < 0) |
800 | db1a4972 | Paolo Bonzini | delta = 0;
|
801 | db1a4972 | Paolo Bonzini | |
802 | db1a4972 | Paolo Bonzini | return delta;
|
803 | db1a4972 | Paolo Bonzini | } |
804 | db1a4972 | Paolo Bonzini | |
805 | 4c3d45eb | Paolo Bonzini | static int64_t qemu_next_alarm_deadline(void) |
806 | db1a4972 | Paolo Bonzini | { |
807 | db1a4972 | Paolo Bonzini | int64_t delta; |
808 | db1a4972 | Paolo Bonzini | int64_t rtdelta; |
809 | db1a4972 | Paolo Bonzini | |
810 | 6ad0a1ed | Paolo Bonzini | if (!use_icount && active_timers[QEMU_CLOCK_VIRTUAL]) {
|
811 | 6ad0a1ed | Paolo Bonzini | delta = active_timers[QEMU_CLOCK_VIRTUAL]->expire_time - |
812 | 74475455 | Paolo Bonzini | qemu_get_clock_ns(vm_clock); |
813 | 6ad0a1ed | Paolo Bonzini | } else {
|
814 | db1a4972 | Paolo Bonzini | delta = INT32_MAX; |
815 | 6ad0a1ed | Paolo Bonzini | } |
816 | 6ad0a1ed | Paolo Bonzini | if (active_timers[QEMU_CLOCK_HOST]) {
|
817 | 6ad0a1ed | Paolo Bonzini | int64_t hdelta = active_timers[QEMU_CLOCK_HOST]->expire_time - |
818 | 6ad0a1ed | Paolo Bonzini | qemu_get_clock_ns(host_clock); |
819 | 6ad0a1ed | Paolo Bonzini | if (hdelta < delta)
|
820 | 6ad0a1ed | Paolo Bonzini | delta = hdelta; |
821 | 6ad0a1ed | Paolo Bonzini | } |
822 | db1a4972 | Paolo Bonzini | if (active_timers[QEMU_CLOCK_REALTIME]) {
|
823 | 4a998740 | Paolo Bonzini | rtdelta = (active_timers[QEMU_CLOCK_REALTIME]->expire_time - |
824 | 9c13246a | Paolo Bonzini | qemu_get_clock_ns(rt_clock)); |
825 | db1a4972 | Paolo Bonzini | if (rtdelta < delta)
|
826 | db1a4972 | Paolo Bonzini | delta = rtdelta; |
827 | db1a4972 | Paolo Bonzini | } |
828 | db1a4972 | Paolo Bonzini | |
829 | db1a4972 | Paolo Bonzini | return delta;
|
830 | db1a4972 | Paolo Bonzini | } |
831 | db1a4972 | Paolo Bonzini | |
832 | 4c3d45eb | Paolo Bonzini | #if defined(__linux__)
|
833 | 4c3d45eb | Paolo Bonzini | |
834 | d25f89c9 | Jan Kiszka | #include "compatfd.h" |
835 | d25f89c9 | Jan Kiszka | |
836 | db1a4972 | Paolo Bonzini | static int dynticks_start_timer(struct qemu_alarm_timer *t) |
837 | db1a4972 | Paolo Bonzini | { |
838 | db1a4972 | Paolo Bonzini | struct sigevent ev;
|
839 | db1a4972 | Paolo Bonzini | timer_t host_timer; |
840 | db1a4972 | Paolo Bonzini | struct sigaction act;
|
841 | db1a4972 | Paolo Bonzini | |
842 | db1a4972 | Paolo Bonzini | sigfillset(&act.sa_mask); |
843 | db1a4972 | Paolo Bonzini | act.sa_flags = 0;
|
844 | db1a4972 | Paolo Bonzini | act.sa_handler = host_alarm_handler; |
845 | db1a4972 | Paolo Bonzini | |
846 | db1a4972 | Paolo Bonzini | sigaction(SIGALRM, &act, NULL);
|
847 | db1a4972 | Paolo Bonzini | |
848 | db1a4972 | Paolo Bonzini | /*
|
849 | db1a4972 | Paolo Bonzini | * Initialize ev struct to 0 to avoid valgrind complaining
|
850 | db1a4972 | Paolo Bonzini | * about uninitialized data in timer_create call
|
851 | db1a4972 | Paolo Bonzini | */
|
852 | db1a4972 | Paolo Bonzini | memset(&ev, 0, sizeof(ev)); |
853 | db1a4972 | Paolo Bonzini | ev.sigev_value.sival_int = 0;
|
854 | db1a4972 | Paolo Bonzini | ev.sigev_notify = SIGEV_SIGNAL; |
855 | d25f89c9 | Jan Kiszka | #ifdef SIGEV_THREAD_ID
|
856 | d25f89c9 | Jan Kiszka | if (qemu_signalfd_available()) {
|
857 | d25f89c9 | Jan Kiszka | ev.sigev_notify = SIGEV_THREAD_ID; |
858 | d25f89c9 | Jan Kiszka | ev._sigev_un._tid = qemu_get_thread_id(); |
859 | d25f89c9 | Jan Kiszka | } |
860 | d25f89c9 | Jan Kiszka | #endif /* SIGEV_THREAD_ID */ |
861 | db1a4972 | Paolo Bonzini | ev.sigev_signo = SIGALRM; |
862 | db1a4972 | Paolo Bonzini | |
863 | db1a4972 | Paolo Bonzini | if (timer_create(CLOCK_REALTIME, &ev, &host_timer)) {
|
864 | db1a4972 | Paolo Bonzini | perror("timer_create");
|
865 | db1a4972 | Paolo Bonzini | |
866 | db1a4972 | Paolo Bonzini | /* disable dynticks */
|
867 | db1a4972 | Paolo Bonzini | fprintf(stderr, "Dynamic Ticks disabled\n");
|
868 | db1a4972 | Paolo Bonzini | |
869 | db1a4972 | Paolo Bonzini | return -1; |
870 | db1a4972 | Paolo Bonzini | } |
871 | db1a4972 | Paolo Bonzini | |
872 | cd0544ee | Stefan Weil | t->timer = host_timer; |
873 | db1a4972 | Paolo Bonzini | |
874 | db1a4972 | Paolo Bonzini | return 0; |
875 | db1a4972 | Paolo Bonzini | } |
876 | db1a4972 | Paolo Bonzini | |
877 | db1a4972 | Paolo Bonzini | static void dynticks_stop_timer(struct qemu_alarm_timer *t) |
878 | db1a4972 | Paolo Bonzini | { |
879 | cd0544ee | Stefan Weil | timer_t host_timer = t->timer; |
880 | db1a4972 | Paolo Bonzini | |
881 | db1a4972 | Paolo Bonzini | timer_delete(host_timer); |
882 | db1a4972 | Paolo Bonzini | } |
883 | db1a4972 | Paolo Bonzini | |
884 | db1a4972 | Paolo Bonzini | static void dynticks_rearm_timer(struct qemu_alarm_timer *t) |
885 | db1a4972 | Paolo Bonzini | { |
886 | cd0544ee | Stefan Weil | timer_t host_timer = t->timer; |
887 | db1a4972 | Paolo Bonzini | struct itimerspec timeout;
|
888 | 9c13246a | Paolo Bonzini | int64_t nearest_delta_ns = INT64_MAX; |
889 | 9c13246a | Paolo Bonzini | int64_t current_ns; |
890 | db1a4972 | Paolo Bonzini | |
891 | db1a4972 | Paolo Bonzini | assert(alarm_has_dynticks(t)); |
892 | db1a4972 | Paolo Bonzini | if (!active_timers[QEMU_CLOCK_REALTIME] &&
|
893 | db1a4972 | Paolo Bonzini | !active_timers[QEMU_CLOCK_VIRTUAL] && |
894 | db1a4972 | Paolo Bonzini | !active_timers[QEMU_CLOCK_HOST]) |
895 | db1a4972 | Paolo Bonzini | return;
|
896 | db1a4972 | Paolo Bonzini | |
897 | 4c3d45eb | Paolo Bonzini | nearest_delta_ns = qemu_next_alarm_deadline(); |
898 | 4c3d45eb | Paolo Bonzini | if (nearest_delta_ns < MIN_TIMER_REARM_NS)
|
899 | 4c3d45eb | Paolo Bonzini | nearest_delta_ns = MIN_TIMER_REARM_NS; |
900 | db1a4972 | Paolo Bonzini | |
901 | db1a4972 | Paolo Bonzini | /* check whether a timer is already running */
|
902 | db1a4972 | Paolo Bonzini | if (timer_gettime(host_timer, &timeout)) {
|
903 | db1a4972 | Paolo Bonzini | perror("gettime");
|
904 | db1a4972 | Paolo Bonzini | fprintf(stderr, "Internal timer error: aborting\n");
|
905 | db1a4972 | Paolo Bonzini | exit(1);
|
906 | db1a4972 | Paolo Bonzini | } |
907 | 9c13246a | Paolo Bonzini | current_ns = timeout.it_value.tv_sec * 1000000000LL + timeout.it_value.tv_nsec;
|
908 | 9c13246a | Paolo Bonzini | if (current_ns && current_ns <= nearest_delta_ns)
|
909 | db1a4972 | Paolo Bonzini | return;
|
910 | db1a4972 | Paolo Bonzini | |
911 | db1a4972 | Paolo Bonzini | timeout.it_interval.tv_sec = 0;
|
912 | db1a4972 | Paolo Bonzini | timeout.it_interval.tv_nsec = 0; /* 0 for one-shot timer */ |
913 | 9c13246a | Paolo Bonzini | timeout.it_value.tv_sec = nearest_delta_ns / 1000000000;
|
914 | 9c13246a | Paolo Bonzini | timeout.it_value.tv_nsec = nearest_delta_ns % 1000000000;
|
915 | db1a4972 | Paolo Bonzini | if (timer_settime(host_timer, 0 /* RELATIVE */, &timeout, NULL)) { |
916 | db1a4972 | Paolo Bonzini | perror("settime");
|
917 | db1a4972 | Paolo Bonzini | fprintf(stderr, "Internal timer error: aborting\n");
|
918 | db1a4972 | Paolo Bonzini | exit(1);
|
919 | db1a4972 | Paolo Bonzini | } |
920 | db1a4972 | Paolo Bonzini | } |
921 | db1a4972 | Paolo Bonzini | |
922 | db1a4972 | Paolo Bonzini | #endif /* defined(__linux__) */ |
923 | db1a4972 | Paolo Bonzini | |
924 | f26e5a54 | Stefan Weil | #if !defined(_WIN32)
|
925 | f26e5a54 | Stefan Weil | |
926 | db1a4972 | Paolo Bonzini | static int unix_start_timer(struct qemu_alarm_timer *t) |
927 | db1a4972 | Paolo Bonzini | { |
928 | db1a4972 | Paolo Bonzini | struct sigaction act;
|
929 | db1a4972 | Paolo Bonzini | |
930 | db1a4972 | Paolo Bonzini | /* timer signal */
|
931 | db1a4972 | Paolo Bonzini | sigfillset(&act.sa_mask); |
932 | db1a4972 | Paolo Bonzini | act.sa_flags = 0;
|
933 | db1a4972 | Paolo Bonzini | act.sa_handler = host_alarm_handler; |
934 | db1a4972 | Paolo Bonzini | |
935 | db1a4972 | Paolo Bonzini | sigaction(SIGALRM, &act, NULL);
|
936 | 84682834 | Paolo Bonzini | return 0; |
937 | 84682834 | Paolo Bonzini | } |
938 | db1a4972 | Paolo Bonzini | |
939 | 84682834 | Paolo Bonzini | static void unix_rearm_timer(struct qemu_alarm_timer *t) |
940 | 84682834 | Paolo Bonzini | { |
941 | 84682834 | Paolo Bonzini | struct itimerval itv;
|
942 | 84682834 | Paolo Bonzini | int64_t nearest_delta_ns = INT64_MAX; |
943 | 84682834 | Paolo Bonzini | int err;
|
944 | db1a4972 | Paolo Bonzini | |
945 | 84682834 | Paolo Bonzini | assert(alarm_has_dynticks(t)); |
946 | 84682834 | Paolo Bonzini | if (!active_timers[QEMU_CLOCK_REALTIME] &&
|
947 | 84682834 | Paolo Bonzini | !active_timers[QEMU_CLOCK_VIRTUAL] && |
948 | 84682834 | Paolo Bonzini | !active_timers[QEMU_CLOCK_HOST]) |
949 | 84682834 | Paolo Bonzini | return;
|
950 | db1a4972 | Paolo Bonzini | |
951 | 84682834 | Paolo Bonzini | nearest_delta_ns = qemu_next_alarm_deadline(); |
952 | 84682834 | Paolo Bonzini | if (nearest_delta_ns < MIN_TIMER_REARM_NS)
|
953 | 84682834 | Paolo Bonzini | nearest_delta_ns = MIN_TIMER_REARM_NS; |
954 | 84682834 | Paolo Bonzini | |
955 | 84682834 | Paolo Bonzini | itv.it_interval.tv_sec = 0;
|
956 | 84682834 | Paolo Bonzini | itv.it_interval.tv_usec = 0; /* 0 for one-shot timer */ |
957 | 84682834 | Paolo Bonzini | itv.it_value.tv_sec = nearest_delta_ns / 1000000000;
|
958 | 84682834 | Paolo Bonzini | itv.it_value.tv_usec = (nearest_delta_ns % 1000000000) / 1000; |
959 | 84682834 | Paolo Bonzini | err = setitimer(ITIMER_REAL, &itv, NULL);
|
960 | 84682834 | Paolo Bonzini | if (err) {
|
961 | 84682834 | Paolo Bonzini | perror("setitimer");
|
962 | 84682834 | Paolo Bonzini | fprintf(stderr, "Internal timer error: aborting\n");
|
963 | 84682834 | Paolo Bonzini | exit(1);
|
964 | 84682834 | Paolo Bonzini | } |
965 | db1a4972 | Paolo Bonzini | } |
966 | db1a4972 | Paolo Bonzini | |
967 | db1a4972 | Paolo Bonzini | static void unix_stop_timer(struct qemu_alarm_timer *t) |
968 | db1a4972 | Paolo Bonzini | { |
969 | db1a4972 | Paolo Bonzini | struct itimerval itv;
|
970 | db1a4972 | Paolo Bonzini | |
971 | db1a4972 | Paolo Bonzini | memset(&itv, 0, sizeof(itv)); |
972 | db1a4972 | Paolo Bonzini | setitimer(ITIMER_REAL, &itv, NULL);
|
973 | db1a4972 | Paolo Bonzini | } |
974 | db1a4972 | Paolo Bonzini | |
975 | db1a4972 | Paolo Bonzini | #endif /* !defined(_WIN32) */ |
976 | db1a4972 | Paolo Bonzini | |
977 | db1a4972 | Paolo Bonzini | |
978 | db1a4972 | Paolo Bonzini | #ifdef _WIN32
|
979 | db1a4972 | Paolo Bonzini | |
980 | 2f9cba0c | Stefan Weil | static MMRESULT mm_timer;
|
981 | 2f9cba0c | Stefan Weil | static unsigned mm_period; |
982 | 2f9cba0c | Stefan Weil | |
983 | 2f9cba0c | Stefan Weil | static void CALLBACK mm_alarm_handler(UINT uTimerID, UINT uMsg, |
984 | 2f9cba0c | Stefan Weil | DWORD_PTR dwUser, DWORD_PTR dw1, |
985 | 2f9cba0c | Stefan Weil | DWORD_PTR dw2) |
986 | 2f9cba0c | Stefan Weil | { |
987 | 2f9cba0c | Stefan Weil | struct qemu_alarm_timer *t = alarm_timer;
|
988 | 2f9cba0c | Stefan Weil | if (!t) {
|
989 | 2f9cba0c | Stefan Weil | return;
|
990 | 2f9cba0c | Stefan Weil | } |
991 | 2f9cba0c | Stefan Weil | if (alarm_has_dynticks(t) || qemu_next_alarm_deadline() <= 0) { |
992 | 2f9cba0c | Stefan Weil | t->expired = alarm_has_dynticks(t); |
993 | 2f9cba0c | Stefan Weil | t->pending = 1;
|
994 | 2f9cba0c | Stefan Weil | qemu_notify_event(); |
995 | 2f9cba0c | Stefan Weil | } |
996 | 2f9cba0c | Stefan Weil | } |
997 | 2f9cba0c | Stefan Weil | |
998 | 2f9cba0c | Stefan Weil | static int mm_start_timer(struct qemu_alarm_timer *t) |
999 | 2f9cba0c | Stefan Weil | { |
1000 | 2f9cba0c | Stefan Weil | TIMECAPS tc; |
1001 | 2f9cba0c | Stefan Weil | UINT flags; |
1002 | 2f9cba0c | Stefan Weil | |
1003 | 2f9cba0c | Stefan Weil | memset(&tc, 0, sizeof(tc)); |
1004 | 2f9cba0c | Stefan Weil | timeGetDevCaps(&tc, sizeof(tc));
|
1005 | 2f9cba0c | Stefan Weil | |
1006 | 2f9cba0c | Stefan Weil | mm_period = tc.wPeriodMin; |
1007 | 2f9cba0c | Stefan Weil | timeBeginPeriod(mm_period); |
1008 | 2f9cba0c | Stefan Weil | |
1009 | 2f9cba0c | Stefan Weil | flags = TIME_CALLBACK_FUNCTION; |
1010 | 2f9cba0c | Stefan Weil | if (alarm_has_dynticks(t)) {
|
1011 | 2f9cba0c | Stefan Weil | flags |= TIME_ONESHOT; |
1012 | 2f9cba0c | Stefan Weil | } else {
|
1013 | 2f9cba0c | Stefan Weil | flags |= TIME_PERIODIC; |
1014 | 2f9cba0c | Stefan Weil | } |
1015 | 2f9cba0c | Stefan Weil | |
1016 | 2f9cba0c | Stefan Weil | mm_timer = timeSetEvent(1, /* interval (ms) */ |
1017 | 2f9cba0c | Stefan Weil | mm_period, /* resolution */
|
1018 | 2f9cba0c | Stefan Weil | mm_alarm_handler, /* function */
|
1019 | 2f9cba0c | Stefan Weil | (DWORD_PTR)t, /* parameter */
|
1020 | 2f9cba0c | Stefan Weil | flags); |
1021 | 2f9cba0c | Stefan Weil | |
1022 | 2f9cba0c | Stefan Weil | if (!mm_timer) {
|
1023 | 2f9cba0c | Stefan Weil | fprintf(stderr, "Failed to initialize win32 alarm timer: %ld\n",
|
1024 | 2f9cba0c | Stefan Weil | GetLastError()); |
1025 | 2f9cba0c | Stefan Weil | timeEndPeriod(mm_period); |
1026 | 2f9cba0c | Stefan Weil | return -1; |
1027 | 2f9cba0c | Stefan Weil | } |
1028 | 2f9cba0c | Stefan Weil | |
1029 | 2f9cba0c | Stefan Weil | return 0; |
1030 | 2f9cba0c | Stefan Weil | } |
1031 | 2f9cba0c | Stefan Weil | |
1032 | 2f9cba0c | Stefan Weil | static void mm_stop_timer(struct qemu_alarm_timer *t) |
1033 | 2f9cba0c | Stefan Weil | { |
1034 | 2f9cba0c | Stefan Weil | timeKillEvent(mm_timer); |
1035 | 2f9cba0c | Stefan Weil | timeEndPeriod(mm_period); |
1036 | 2f9cba0c | Stefan Weil | } |
1037 | 2f9cba0c | Stefan Weil | |
1038 | 2f9cba0c | Stefan Weil | static void mm_rearm_timer(struct qemu_alarm_timer *t) |
1039 | 2f9cba0c | Stefan Weil | { |
1040 | 2f9cba0c | Stefan Weil | int nearest_delta_ms;
|
1041 | 2f9cba0c | Stefan Weil | |
1042 | 2f9cba0c | Stefan Weil | assert(alarm_has_dynticks(t)); |
1043 | 2f9cba0c | Stefan Weil | if (!active_timers[QEMU_CLOCK_REALTIME] &&
|
1044 | 2f9cba0c | Stefan Weil | !active_timers[QEMU_CLOCK_VIRTUAL] && |
1045 | 2f9cba0c | Stefan Weil | !active_timers[QEMU_CLOCK_HOST]) { |
1046 | 2f9cba0c | Stefan Weil | return;
|
1047 | 2f9cba0c | Stefan Weil | } |
1048 | 2f9cba0c | Stefan Weil | |
1049 | 2f9cba0c | Stefan Weil | timeKillEvent(mm_timer); |
1050 | 2f9cba0c | Stefan Weil | |
1051 | 2f9cba0c | Stefan Weil | nearest_delta_ms = (qemu_next_alarm_deadline() + 999999) / 1000000; |
1052 | 2f9cba0c | Stefan Weil | if (nearest_delta_ms < 1) { |
1053 | 2f9cba0c | Stefan Weil | nearest_delta_ms = 1;
|
1054 | 2f9cba0c | Stefan Weil | } |
1055 | 2f9cba0c | Stefan Weil | mm_timer = timeSetEvent(nearest_delta_ms, |
1056 | 2f9cba0c | Stefan Weil | mm_period, |
1057 | 2f9cba0c | Stefan Weil | mm_alarm_handler, |
1058 | 2f9cba0c | Stefan Weil | (DWORD_PTR)t, |
1059 | 2f9cba0c | Stefan Weil | TIME_ONESHOT | TIME_CALLBACK_FUNCTION); |
1060 | 2f9cba0c | Stefan Weil | |
1061 | 2f9cba0c | Stefan Weil | if (!mm_timer) {
|
1062 | 2f9cba0c | Stefan Weil | fprintf(stderr, "Failed to re-arm win32 alarm timer %ld\n",
|
1063 | 2f9cba0c | Stefan Weil | GetLastError()); |
1064 | 2f9cba0c | Stefan Weil | |
1065 | 2f9cba0c | Stefan Weil | timeEndPeriod(mm_period); |
1066 | 2f9cba0c | Stefan Weil | exit(1);
|
1067 | 2f9cba0c | Stefan Weil | } |
1068 | 2f9cba0c | Stefan Weil | } |
1069 | 2f9cba0c | Stefan Weil | |
1070 | db1a4972 | Paolo Bonzini | static int win32_start_timer(struct qemu_alarm_timer *t) |
1071 | db1a4972 | Paolo Bonzini | { |
1072 | 68c23e55 | Paolo Bonzini | HANDLE hTimer; |
1073 | 68c23e55 | Paolo Bonzini | BOOLEAN success; |
1074 | 68c23e55 | Paolo Bonzini | |
1075 | 68c23e55 | Paolo Bonzini | /* If you call ChangeTimerQueueTimer on a one-shot timer (its period
|
1076 | 68c23e55 | Paolo Bonzini | is zero) that has already expired, the timer is not updated. Since
|
1077 | 68c23e55 | Paolo Bonzini | creating a new timer is relatively expensive, set a bogus one-hour
|
1078 | 68c23e55 | Paolo Bonzini | interval in the dynticks case. */
|
1079 | 68c23e55 | Paolo Bonzini | success = CreateTimerQueueTimer(&hTimer, |
1080 | 68c23e55 | Paolo Bonzini | NULL,
|
1081 | 68c23e55 | Paolo Bonzini | host_alarm_handler, |
1082 | 68c23e55 | Paolo Bonzini | t, |
1083 | 68c23e55 | Paolo Bonzini | 1,
|
1084 | 68c23e55 | Paolo Bonzini | alarm_has_dynticks(t) ? 3600000 : 1, |
1085 | 68c23e55 | Paolo Bonzini | WT_EXECUTEINTIMERTHREAD); |
1086 | 68c23e55 | Paolo Bonzini | |
1087 | 68c23e55 | Paolo Bonzini | if (!success) {
|
1088 | db1a4972 | Paolo Bonzini | fprintf(stderr, "Failed to initialize win32 alarm timer: %ld\n",
|
1089 | db1a4972 | Paolo Bonzini | GetLastError()); |
1090 | db1a4972 | Paolo Bonzini | return -1; |
1091 | db1a4972 | Paolo Bonzini | } |
1092 | db1a4972 | Paolo Bonzini | |
1093 | cd0544ee | Stefan Weil | t->timer = hTimer; |
1094 | db1a4972 | Paolo Bonzini | return 0; |
1095 | db1a4972 | Paolo Bonzini | } |
1096 | db1a4972 | Paolo Bonzini | |
1097 | db1a4972 | Paolo Bonzini | static void win32_stop_timer(struct qemu_alarm_timer *t) |
1098 | db1a4972 | Paolo Bonzini | { |
1099 | cd0544ee | Stefan Weil | HANDLE hTimer = t->timer; |
1100 | db1a4972 | Paolo Bonzini | |
1101 | 68c23e55 | Paolo Bonzini | if (hTimer) {
|
1102 | 68c23e55 | Paolo Bonzini | DeleteTimerQueueTimer(NULL, hTimer, NULL); |
1103 | 68c23e55 | Paolo Bonzini | } |
1104 | db1a4972 | Paolo Bonzini | } |
1105 | db1a4972 | Paolo Bonzini | |
1106 | db1a4972 | Paolo Bonzini | static void win32_rearm_timer(struct qemu_alarm_timer *t) |
1107 | db1a4972 | Paolo Bonzini | { |
1108 | cd0544ee | Stefan Weil | HANDLE hTimer = t->timer; |
1109 | cfced5b2 | Paolo Bonzini | int nearest_delta_ms;
|
1110 | 68c23e55 | Paolo Bonzini | BOOLEAN success; |
1111 | db1a4972 | Paolo Bonzini | |
1112 | db1a4972 | Paolo Bonzini | assert(alarm_has_dynticks(t)); |
1113 | db1a4972 | Paolo Bonzini | if (!active_timers[QEMU_CLOCK_REALTIME] &&
|
1114 | db1a4972 | Paolo Bonzini | !active_timers[QEMU_CLOCK_VIRTUAL] && |
1115 | db1a4972 | Paolo Bonzini | !active_timers[QEMU_CLOCK_HOST]) |
1116 | db1a4972 | Paolo Bonzini | return;
|
1117 | db1a4972 | Paolo Bonzini | |
1118 | cfced5b2 | Paolo Bonzini | nearest_delta_ms = (qemu_next_alarm_deadline() + 999999) / 1000000; |
1119 | cfced5b2 | Paolo Bonzini | if (nearest_delta_ms < 1) { |
1120 | cfced5b2 | Paolo Bonzini | nearest_delta_ms = 1;
|
1121 | cfced5b2 | Paolo Bonzini | } |
1122 | 68c23e55 | Paolo Bonzini | success = ChangeTimerQueueTimer(NULL,
|
1123 | 68c23e55 | Paolo Bonzini | hTimer, |
1124 | 68c23e55 | Paolo Bonzini | nearest_delta_ms, |
1125 | 68c23e55 | Paolo Bonzini | 3600000);
|
1126 | db1a4972 | Paolo Bonzini | |
1127 | 68c23e55 | Paolo Bonzini | if (!success) {
|
1128 | 68c23e55 | Paolo Bonzini | fprintf(stderr, "Failed to rearm win32 alarm timer: %ld\n",
|
1129 | 68c23e55 | Paolo Bonzini | GetLastError()); |
1130 | 68c23e55 | Paolo Bonzini | exit(-1);
|
1131 | db1a4972 | Paolo Bonzini | } |
1132 | 68c23e55 | Paolo Bonzini | |
1133 | db1a4972 | Paolo Bonzini | } |
1134 | db1a4972 | Paolo Bonzini | |
1135 | db1a4972 | Paolo Bonzini | #endif /* _WIN32 */ |
1136 | db1a4972 | Paolo Bonzini | |
1137 | db1a4972 | Paolo Bonzini | static void alarm_timer_on_change_state_rearm(void *opaque, int running, int reason) |
1138 | db1a4972 | Paolo Bonzini | { |
1139 | db1a4972 | Paolo Bonzini | if (running)
|
1140 | db1a4972 | Paolo Bonzini | qemu_rearm_alarm_timer((struct qemu_alarm_timer *) opaque);
|
1141 | db1a4972 | Paolo Bonzini | } |
1142 | db1a4972 | Paolo Bonzini | |
1143 | db1a4972 | Paolo Bonzini | int init_timer_alarm(void) |
1144 | db1a4972 | Paolo Bonzini | { |
1145 | db1a4972 | Paolo Bonzini | struct qemu_alarm_timer *t = NULL; |
1146 | db1a4972 | Paolo Bonzini | int i, err = -1; |
1147 | db1a4972 | Paolo Bonzini | |
1148 | db1a4972 | Paolo Bonzini | for (i = 0; alarm_timers[i].name; i++) { |
1149 | db1a4972 | Paolo Bonzini | t = &alarm_timers[i]; |
1150 | db1a4972 | Paolo Bonzini | |
1151 | db1a4972 | Paolo Bonzini | err = t->start(t); |
1152 | db1a4972 | Paolo Bonzini | if (!err)
|
1153 | db1a4972 | Paolo Bonzini | break;
|
1154 | db1a4972 | Paolo Bonzini | } |
1155 | db1a4972 | Paolo Bonzini | |
1156 | db1a4972 | Paolo Bonzini | if (err) {
|
1157 | db1a4972 | Paolo Bonzini | err = -ENOENT; |
1158 | db1a4972 | Paolo Bonzini | goto fail;
|
1159 | db1a4972 | Paolo Bonzini | } |
1160 | db1a4972 | Paolo Bonzini | |
1161 | db1a4972 | Paolo Bonzini | /* first event is at time 0 */
|
1162 | db1a4972 | Paolo Bonzini | t->pending = 1;
|
1163 | db1a4972 | Paolo Bonzini | alarm_timer = t; |
1164 | db1a4972 | Paolo Bonzini | qemu_add_vm_change_state_handler(alarm_timer_on_change_state_rearm, t); |
1165 | db1a4972 | Paolo Bonzini | |
1166 | db1a4972 | Paolo Bonzini | return 0; |
1167 | db1a4972 | Paolo Bonzini | |
1168 | db1a4972 | Paolo Bonzini | fail:
|
1169 | db1a4972 | Paolo Bonzini | return err;
|
1170 | db1a4972 | Paolo Bonzini | } |
1171 | db1a4972 | Paolo Bonzini | |
1172 | db1a4972 | Paolo Bonzini | void quit_timers(void) |
1173 | db1a4972 | Paolo Bonzini | { |
1174 | db1a4972 | Paolo Bonzini | struct qemu_alarm_timer *t = alarm_timer;
|
1175 | db1a4972 | Paolo Bonzini | alarm_timer = NULL;
|
1176 | db1a4972 | Paolo Bonzini | t->stop(t); |
1177 | db1a4972 | Paolo Bonzini | } |
1178 | db1a4972 | Paolo Bonzini | |
1179 | db1a4972 | Paolo Bonzini | int qemu_calculate_timeout(void) |
1180 | db1a4972 | Paolo Bonzini | { |
1181 | 1ece93a9 | Paolo Bonzini | #ifndef CONFIG_IOTHREAD
|
1182 | db1a4972 | Paolo Bonzini | int timeout;
|
1183 | db1a4972 | Paolo Bonzini | |
1184 | 1ece93a9 | Paolo Bonzini | if (!vm_running)
|
1185 | 1ece93a9 | Paolo Bonzini | timeout = 5000;
|
1186 | 1ece93a9 | Paolo Bonzini | else {
|
1187 | 1ece93a9 | Paolo Bonzini | /* XXX: use timeout computed from timers */
|
1188 | 1ece93a9 | Paolo Bonzini | int64_t add; |
1189 | 1ece93a9 | Paolo Bonzini | int64_t delta; |
1190 | 1ece93a9 | Paolo Bonzini | /* Advance virtual time to the next event. */
|
1191 | 1ece93a9 | Paolo Bonzini | delta = qemu_icount_delta(); |
1192 | 1ece93a9 | Paolo Bonzini | if (delta > 0) { |
1193 | 1ece93a9 | Paolo Bonzini | /* If virtual time is ahead of real time then just
|
1194 | 1ece93a9 | Paolo Bonzini | wait for IO. */
|
1195 | 1ece93a9 | Paolo Bonzini | timeout = (delta + 999999) / 1000000; |
1196 | 1ece93a9 | Paolo Bonzini | } else {
|
1197 | 1ece93a9 | Paolo Bonzini | /* Wait for either IO to occur or the next
|
1198 | 1ece93a9 | Paolo Bonzini | timer event. */
|
1199 | cb842c90 | Paolo Bonzini | add = qemu_next_icount_deadline(); |
1200 | 1ece93a9 | Paolo Bonzini | /* We advance the timer before checking for IO.
|
1201 | 1ece93a9 | Paolo Bonzini | Limit the amount we advance so that early IO
|
1202 | 1ece93a9 | Paolo Bonzini | activity won't get the guest too far ahead. */
|
1203 | 1ece93a9 | Paolo Bonzini | if (add > 10000000) |
1204 | 1ece93a9 | Paolo Bonzini | add = 10000000;
|
1205 | 1ece93a9 | Paolo Bonzini | delta += add; |
1206 | 1ece93a9 | Paolo Bonzini | qemu_icount += qemu_icount_round (add); |
1207 | 1ece93a9 | Paolo Bonzini | timeout = delta / 1000000;
|
1208 | 1ece93a9 | Paolo Bonzini | if (timeout < 0) |
1209 | 1ece93a9 | Paolo Bonzini | timeout = 0;
|
1210 | 1ece93a9 | Paolo Bonzini | } |
1211 | db1a4972 | Paolo Bonzini | } |
1212 | db1a4972 | Paolo Bonzini | |
1213 | db1a4972 | Paolo Bonzini | return timeout;
|
1214 | 1ece93a9 | Paolo Bonzini | #else /* CONFIG_IOTHREAD */ |
1215 | 1ece93a9 | Paolo Bonzini | return 1000; |
1216 | 1ece93a9 | Paolo Bonzini | #endif
|
1217 | db1a4972 | Paolo Bonzini | } |