xref: /qemu/replay/replay-events.c (revision b2a3cbb8) 
1 /*
2  * replay-events.c
3  *
4  * Copyright (c) 2010-2015 Institute for System Programming
5  *                         of the Russian Academy of Sciences.
6  *
7  * This work is licensed under the terms of the GNU GPL, version 2 or later.
8  * See the COPYING file in the top-level directory.
9  *
10  */
11 
12 #include "qemu/osdep.h"
13 #include "qemu/error-report.h"
14 #include "sysemu/replay.h"
15 #include "replay-internal.h"
16 #include "block/aio.h"
17 #include "ui/input.h"
18 #include "hw/core/cpu.h"
19 
20 typedef struct Event {
21     ReplayAsyncEventKind event_kind;
22     void *opaque;
23     void *opaque2;
24     uint64_t id;
25 
26     QTAILQ_ENTRY(Event) events;
27 } Event;
28 
29 static QTAILQ_HEAD(, Event) events_list = QTAILQ_HEAD_INITIALIZER(events_list);
30 static bool events_enabled;
31 
32 /* Functions */
33 
34 static void replay_run_event(Event *event)
35 {
36     switch (event->event_kind) {
37     case REPLAY_ASYNC_EVENT_BH:
38         aio_bh_call(event->opaque);
39         break;
40     case REPLAY_ASYNC_EVENT_BH_ONESHOT:
41         ((QEMUBHFunc *)event->opaque)(event->opaque2);
42         break;
43     case REPLAY_ASYNC_EVENT_INPUT:
44         qemu_input_event_send_impl(NULL, (InputEvent *)event->opaque);
45         qapi_free_InputEvent((InputEvent *)event->opaque);
46         break;
47     case REPLAY_ASYNC_EVENT_INPUT_SYNC:
48         qemu_input_event_sync_impl();
49         break;
50     case REPLAY_ASYNC_EVENT_CHAR_READ:
51         replay_event_char_read_run(event->opaque);
52         break;
53     case REPLAY_ASYNC_EVENT_BLOCK:
54         aio_bh_call(event->opaque);
55         break;
56     case REPLAY_ASYNC_EVENT_NET:
57         replay_event_net_run(event->opaque);
58         break;
59     default:
60         error_report("Replay: invalid async event ID (%d) in the queue",
61                     event->event_kind);
62         exit(1);
63         break;
64     }
65 }
66 
67 void replay_enable_events(void)
68 {
69     if (replay_mode != REPLAY_MODE_NONE) {
70         events_enabled = true;
71     }
72 }
73 
74 bool replay_has_events(void)
75 {
76     return !QTAILQ_EMPTY(&events_list);
77 }
78 
79 void replay_flush_events(void)
80 {
81     if (replay_mode == REPLAY_MODE_NONE) {
82         return;
83     }
84 
85     g_assert(replay_mutex_locked());
86 
87     while (!QTAILQ_EMPTY(&events_list)) {
88         Event *event = QTAILQ_FIRST(&events_list);
89         replay_run_event(event);
90         QTAILQ_REMOVE(&events_list, event, events);
91         g_free(event);
92     }
93 }
94 
95 void replay_disable_events(void)
96 {
97     if (replay_mode != REPLAY_MODE_NONE) {
98         events_enabled = false;
99         /* Flush events queue before waiting of completion */
100         replay_flush_events();
101     }
102 }
103 
104 /*! Adds specified async event to the queue */
105 void replay_add_event(ReplayAsyncEventKind event_kind,
106                       void *opaque,
107                       void *opaque2, uint64_t id)
108 {
109     assert(event_kind < REPLAY_ASYNC_COUNT);
110 
111     if (!replay_file || replay_mode == REPLAY_MODE_NONE
112         || !events_enabled) {
113         Event e;
114         e.event_kind = event_kind;
115         e.opaque = opaque;
116         e.opaque2 = opaque2;
117         e.id = id;
118         replay_run_event(&e);
119         return;
120     }
121 
122     Event *event = g_new0(Event, 1);
123     event->event_kind = event_kind;
124     event->opaque = opaque;
125     event->opaque2 = opaque2;
126     event->id = id;
127 
128     g_assert(replay_mutex_locked());
129     QTAILQ_INSERT_TAIL(&events_list, event, events);
130     qemu_cpu_kick(first_cpu);
131 }
132 
133 void replay_bh_schedule_event(QEMUBH *bh)
134 {
135     if (events_enabled) {
136         uint64_t id = replay_get_current_icount();
137         replay_add_event(REPLAY_ASYNC_EVENT_BH, bh, NULL, id);
138     } else {
139         qemu_bh_schedule(bh);
140     }
141 }
142 
143 void replay_bh_schedule_oneshot_event(AioContext *ctx,
144     QEMUBHFunc *cb, void *opaque)
145 {
146     if (events_enabled) {
147         uint64_t id = replay_get_current_icount();
148         replay_add_event(REPLAY_ASYNC_EVENT_BH_ONESHOT, cb, opaque, id);
149     } else {
150         aio_bh_schedule_oneshot(ctx, cb, opaque);
151     }
152 }
153 
154 void replay_add_input_event(struct InputEvent *event)
155 {
156     replay_add_event(REPLAY_ASYNC_EVENT_INPUT, event, NULL, 0);
157 }
158 
159 void replay_add_input_sync_event(void)
160 {
161     replay_add_event(REPLAY_ASYNC_EVENT_INPUT_SYNC, NULL, NULL, 0);
162 }
163 
164 void replay_block_event(QEMUBH *bh, uint64_t id)
165 {
166     if (events_enabled) {
167         replay_add_event(REPLAY_ASYNC_EVENT_BLOCK, bh, NULL, id);
168     } else {
169         qemu_bh_schedule(bh);
170     }
171 }
172 
173 static void replay_save_event(Event *event)
174 {
175     if (replay_mode != REPLAY_MODE_PLAY) {
176         /* put the event into the file */
177         g_assert(event->event_kind < REPLAY_ASYNC_COUNT);
178         replay_put_event(EVENT_ASYNC + event->event_kind);
179 
180         /* save event-specific data */
181         switch (event->event_kind) {
182         case REPLAY_ASYNC_EVENT_BH:
183         case REPLAY_ASYNC_EVENT_BH_ONESHOT:
184             replay_put_qword(event->id);
185             break;
186         case REPLAY_ASYNC_EVENT_INPUT:
187             replay_save_input_event(event->opaque);
188             break;
189         case REPLAY_ASYNC_EVENT_INPUT_SYNC:
190             break;
191         case REPLAY_ASYNC_EVENT_CHAR_READ:
192             replay_event_char_read_save(event->opaque);
193             break;
194         case REPLAY_ASYNC_EVENT_BLOCK:
195             replay_put_qword(event->id);
196             break;
197         case REPLAY_ASYNC_EVENT_NET:
198             replay_event_net_save(event->opaque);
199             break;
200         default:
201             error_report("Unknown ID %" PRId64 " of replay event", event->id);
202             exit(1);
203         }
204     }
205 }
206 
207 /* Called with replay mutex locked */
208 void replay_save_events(void)
209 {
210     g_assert(replay_mutex_locked());
211     while (!QTAILQ_EMPTY(&events_list)) {
212         Event *event = QTAILQ_FIRST(&events_list);
213         replay_save_event(event);
214         replay_run_event(event);
215         QTAILQ_REMOVE(&events_list, event, events);
216         g_free(event);
217     }
218 }
219 
220 static Event *replay_read_event(void)
221 {
222     Event *event;
223     ReplayAsyncEventKind event_kind = replay_state.data_kind - EVENT_ASYNC;
224 
225     /* Events that has not to be in the queue */
226     switch (event_kind) {
227     case REPLAY_ASYNC_EVENT_BH:
228     case REPLAY_ASYNC_EVENT_BH_ONESHOT:
229         if (replay_state.read_event_id == -1) {
230             replay_state.read_event_id = replay_get_qword();
231         }
232         break;
233     case REPLAY_ASYNC_EVENT_INPUT:
234         event = g_new0(Event, 1);
235         event->event_kind = event_kind;
236         event->opaque = replay_read_input_event();
237         return event;
238     case REPLAY_ASYNC_EVENT_INPUT_SYNC:
239         event = g_new0(Event, 1);
240         event->event_kind = event_kind;
241         event->opaque = 0;
242         return event;
243     case REPLAY_ASYNC_EVENT_CHAR_READ:
244         event = g_new0(Event, 1);
245         event->event_kind = event_kind;
246         event->opaque = replay_event_char_read_load();
247         return event;
248     case REPLAY_ASYNC_EVENT_BLOCK:
249         if (replay_state.read_event_id == -1) {
250             replay_state.read_event_id = replay_get_qword();
251         }
252         break;
253     case REPLAY_ASYNC_EVENT_NET:
254         event = g_new0(Event, 1);
255         event->event_kind = event_kind;
256         event->opaque = replay_event_net_load();
257         return event;
258     default:
259         error_report("Unknown ID %d of replay event", event_kind);
260         exit(1);
261         break;
262     }
263 
264     QTAILQ_FOREACH(event, &events_list, events) {
265         if (event->event_kind == event_kind
266             && (replay_state.read_event_id == -1
267                 || replay_state.read_event_id == event->id)) {
268             break;
269         }
270     }
271 
272     if (event) {
273         QTAILQ_REMOVE(&events_list, event, events);
274     }
275 
276     return event;
277 }
278 
279 /* Called with replay mutex locked */
280 void replay_read_events(void)
281 {
282     g_assert(replay_mutex_locked());
283     while (replay_state.data_kind >= EVENT_ASYNC
284         && replay_state.data_kind <= EVENT_ASYNC_LAST) {
285         Event *event = replay_read_event();
286         if (!event) {
287             break;
288         }
289         replay_finish_event();
290         replay_state.read_event_id = -1;
291         replay_run_event(event);
292 
293         g_free(event);
294     }
295 }
296 
297 void replay_init_events(void)
298 {
299     replay_state.read_event_id = -1;
300 }
301 
302 void replay_finish_events(void)
303 {
304     events_enabled = false;
305     replay_flush_events();
306 }
307 
308 bool replay_events_enabled(void)
309 {
310     return events_enabled;
311 }
312 
313 uint64_t blkreplay_next_id(void)
314 {
315     if (replay_events_enabled()) {
316         return replay_state.block_request_id++;
317     }
318     return 0;
319 }
320