xref: /openbmc/qemu/replay/replay-events.c (revision 4a09d0bb) 
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-common.h"
14 #include "qemu/error-report.h"
15 #include "sysemu/replay.h"
16 #include "replay-internal.h"
17 #include "block/aio.h"
18 #include "ui/input.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 unsigned int read_event_kind = -1;
31 static uint64_t read_id = -1;
32 static int read_checkpoint = -1;
33 
34 static bool events_enabled;
35 
36 /* Functions */
37 
38 static void replay_run_event(Event *event)
39 {
40     switch (event->event_kind) {
41     case REPLAY_ASYNC_EVENT_BH:
42         aio_bh_call(event->opaque);
43         break;
44     case REPLAY_ASYNC_EVENT_INPUT:
45         qemu_input_event_send_impl(NULL, (InputEvent *)event->opaque);
46         qapi_free_InputEvent((InputEvent *)event->opaque);
47         break;
48     case REPLAY_ASYNC_EVENT_INPUT_SYNC:
49         qemu_input_event_sync_impl();
50         break;
51     case REPLAY_ASYNC_EVENT_CHAR_READ:
52         replay_event_char_read_run(event->opaque);
53         break;
54     case REPLAY_ASYNC_EVENT_BLOCK:
55         aio_bh_call(event->opaque);
56         break;
57     case REPLAY_ASYNC_EVENT_NET:
58         replay_event_net_run(event->opaque);
59         break;
60     default:
61         error_report("Replay: invalid async event ID (%d) in the queue",
62                     event->event_kind);
63         exit(1);
64         break;
65     }
66 }
67 
68 void replay_enable_events(void)
69 {
70     events_enabled = true;
71 }
72 
73 bool replay_has_events(void)
74 {
75     return !QTAILQ_EMPTY(&events_list);
76 }
77 
78 void replay_flush_events(void)
79 {
80     replay_mutex_lock();
81     while (!QTAILQ_EMPTY(&events_list)) {
82         Event *event = QTAILQ_FIRST(&events_list);
83         replay_mutex_unlock();
84         replay_run_event(event);
85         replay_mutex_lock();
86         QTAILQ_REMOVE(&events_list, event, events);
87         g_free(event);
88     }
89     replay_mutex_unlock();
90 }
91 
92 void replay_disable_events(void)
93 {
94     if (replay_mode != REPLAY_MODE_NONE) {
95         events_enabled = false;
96         /* Flush events queue before waiting of completion */
97         replay_flush_events();
98     }
99 }
100 
101 void replay_clear_events(void)
102 {
103     replay_mutex_lock();
104     while (!QTAILQ_EMPTY(&events_list)) {
105         Event *event = QTAILQ_FIRST(&events_list);
106         QTAILQ_REMOVE(&events_list, event, events);
107 
108         g_free(event);
109     }
110     replay_mutex_unlock();
111 }
112 
113 /*! Adds specified async event to the queue */
114 void replay_add_event(ReplayAsyncEventKind event_kind,
115                       void *opaque,
116                       void *opaque2, uint64_t id)
117 {
118     assert(event_kind < REPLAY_ASYNC_COUNT);
119 
120     if (!replay_file || replay_mode == REPLAY_MODE_NONE
121         || !events_enabled) {
122         Event e;
123         e.event_kind = event_kind;
124         e.opaque = opaque;
125         e.opaque2 = opaque2;
126         e.id = id;
127         replay_run_event(&e);
128         return;
129     }
130 
131     Event *event = g_malloc0(sizeof(Event));
132     event->event_kind = event_kind;
133     event->opaque = opaque;
134     event->opaque2 = opaque2;
135     event->id = id;
136 
137     replay_mutex_lock();
138     QTAILQ_INSERT_TAIL(&events_list, event, events);
139     replay_mutex_unlock();
140 }
141 
142 void replay_bh_schedule_event(QEMUBH *bh)
143 {
144     if (replay_mode != REPLAY_MODE_NONE && events_enabled) {
145         uint64_t id = replay_get_current_step();
146         replay_add_event(REPLAY_ASYNC_EVENT_BH, bh, NULL, id);
147     } else {
148         qemu_bh_schedule(bh);
149     }
150 }
151 
152 void replay_add_input_event(struct InputEvent *event)
153 {
154     replay_add_event(REPLAY_ASYNC_EVENT_INPUT, event, NULL, 0);
155 }
156 
157 void replay_add_input_sync_event(void)
158 {
159     replay_add_event(REPLAY_ASYNC_EVENT_INPUT_SYNC, NULL, NULL, 0);
160 }
161 
162 void replay_block_event(QEMUBH *bh, uint64_t id)
163 {
164     if (replay_mode != REPLAY_MODE_NONE && events_enabled) {
165         replay_add_event(REPLAY_ASYNC_EVENT_BLOCK, bh, NULL, id);
166     } else {
167         qemu_bh_schedule(bh);
168     }
169 }
170 
171 static void replay_save_event(Event *event, int checkpoint)
172 {
173     if (replay_mode != REPLAY_MODE_PLAY) {
174         /* put the event into the file */
175         replay_put_event(EVENT_ASYNC);
176         replay_put_byte(checkpoint);
177         replay_put_byte(event->event_kind);
178 
179         /* save event-specific data */
180         switch (event->event_kind) {
181         case REPLAY_ASYNC_EVENT_BH:
182             replay_put_qword(event->id);
183             break;
184         case REPLAY_ASYNC_EVENT_INPUT:
185             replay_save_input_event(event->opaque);
186             break;
187         case REPLAY_ASYNC_EVENT_INPUT_SYNC:
188             break;
189         case REPLAY_ASYNC_EVENT_CHAR_READ:
190             replay_event_char_read_save(event->opaque);
191             break;
192         case REPLAY_ASYNC_EVENT_BLOCK:
193             replay_put_qword(event->id);
194             break;
195         case REPLAY_ASYNC_EVENT_NET:
196             replay_event_net_save(event->opaque);
197             break;
198         default:
199             error_report("Unknown ID %" PRId64 " of replay event", event->id);
200             exit(1);
201         }
202     }
203 }
204 
205 /* Called with replay mutex locked */
206 void replay_save_events(int checkpoint)
207 {
208     while (!QTAILQ_EMPTY(&events_list)) {
209         Event *event = QTAILQ_FIRST(&events_list);
210         replay_save_event(event, checkpoint);
211 
212         replay_mutex_unlock();
213         replay_run_event(event);
214         replay_mutex_lock();
215         QTAILQ_REMOVE(&events_list, event, events);
216         g_free(event);
217     }
218 }
219 
220 static Event *replay_read_event(int checkpoint)
221 {
222     Event *event;
223     if (read_event_kind == -1) {
224         read_checkpoint = replay_get_byte();
225         read_event_kind = replay_get_byte();
226         read_id = -1;
227         replay_check_error();
228     }
229 
230     if (checkpoint != read_checkpoint) {
231         return NULL;
232     }
233 
234     /* Events that has not to be in the queue */
235     switch (read_event_kind) {
236     case REPLAY_ASYNC_EVENT_BH:
237         if (read_id == -1) {
238             read_id = replay_get_qword();
239         }
240         break;
241     case REPLAY_ASYNC_EVENT_INPUT:
242         event = g_malloc0(sizeof(Event));
243         event->event_kind = read_event_kind;
244         event->opaque = replay_read_input_event();
245         return event;
246     case REPLAY_ASYNC_EVENT_INPUT_SYNC:
247         event = g_malloc0(sizeof(Event));
248         event->event_kind = read_event_kind;
249         event->opaque = 0;
250         return event;
251     case REPLAY_ASYNC_EVENT_CHAR_READ:
252         event = g_malloc0(sizeof(Event));
253         event->event_kind = read_event_kind;
254         event->opaque = replay_event_char_read_load();
255         return event;
256     case REPLAY_ASYNC_EVENT_BLOCK:
257         if (read_id == -1) {
258             read_id = replay_get_qword();
259         }
260         break;
261     case REPLAY_ASYNC_EVENT_NET:
262         event = g_malloc0(sizeof(Event));
263         event->event_kind = read_event_kind;
264         event->opaque = replay_event_net_load();
265         return event;
266     default:
267         error_report("Unknown ID %d of replay event", read_event_kind);
268         exit(1);
269         break;
270     }
271 
272     QTAILQ_FOREACH(event, &events_list, events) {
273         if (event->event_kind == read_event_kind
274             && (read_id == -1 || read_id == event->id)) {
275             break;
276         }
277     }
278 
279     if (event) {
280         QTAILQ_REMOVE(&events_list, event, events);
281     } else {
282         return NULL;
283     }
284 
285     /* Read event-specific data */
286 
287     return event;
288 }
289 
290 /* Called with replay mutex locked */
291 void replay_read_events(int checkpoint)
292 {
293     while (replay_state.data_kind == EVENT_ASYNC) {
294         Event *event = replay_read_event(checkpoint);
295         if (!event) {
296             break;
297         }
298         replay_mutex_unlock();
299         replay_run_event(event);
300         replay_mutex_lock();
301 
302         g_free(event);
303         replay_finish_event();
304         read_event_kind = -1;
305     }
306 }
307 
308 void replay_init_events(void)
309 {
310     read_event_kind = -1;
311 }
312 
313 void replay_finish_events(void)
314 {
315     events_enabled = false;
316     replay_clear_events();
317 }
318 
319 bool replay_events_enabled(void)
320 {
321     return events_enabled;
322 }
323 
324 uint64_t blkreplay_next_id(void)
325 {
326     if (replay_events_enabled()) {
327         return replay_state.block_request_id++;
328     }
329     return 0;
330 }
331