1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
|
/*
* Interface for configuring and controlling the state of tracing events.
*
* Copyright (C) 2011-2016 Lluís Vilanova <vilanova@ac.upc.edu>
*
* This work is licensed under the terms of the GNU GPL, version 2 or later.
* See the COPYING file in the top-level directory.
*/
#include "qemu/osdep.h"
#include "trace/control.h"
#include "qemu/help_option.h"
#include "qemu/option.h"
#ifdef CONFIG_TRACE_SIMPLE
#include "trace/simple.h"
#endif
#ifdef CONFIG_TRACE_FTRACE
#include "trace/ftrace.h"
#endif
#ifdef CONFIG_TRACE_LOG
#include "qemu/log.h"
#endif
#ifdef CONFIG_TRACE_SYSLOG
#include <syslog.h>
#endif
#include "qapi/error.h"
#include "qemu/error-report.h"
#include "qemu/config-file.h"
#include "monitor/monitor.h"
#include "trace-root.h"
int trace_events_enabled_count;
typedef struct TraceEventGroup {
TraceEvent **events;
} TraceEventGroup;
static TraceEventGroup *event_groups;
static size_t nevent_groups;
static uint32_t next_id;
static uint32_t next_vcpu_id;
QemuOptsList qemu_trace_opts = {
.name = "trace",
.implied_opt_name = "enable",
.head = QTAILQ_HEAD_INITIALIZER(qemu_trace_opts.head),
.desc = {
{
.name = "enable",
.type = QEMU_OPT_STRING,
},
{
.name = "events",
.type = QEMU_OPT_STRING,
},{
.name = "file",
.type = QEMU_OPT_STRING,
},
{ /* end of list */ }
},
};
void trace_event_register_group(TraceEvent **events)
{
size_t i;
for (i = 0; events[i] != NULL; i++) {
events[i]->id = next_id++;
if (events[i]->vcpu_id == TRACE_VCPU_EVENT_NONE) {
continue;
}
if (likely(next_vcpu_id < CPU_TRACE_DSTATE_MAX_EVENTS)) {
events[i]->vcpu_id = next_vcpu_id++;
} else {
warn_report("too many vcpu trace events; dropping '%s'",
events[i]->name);
}
}
event_groups = g_renew(TraceEventGroup, event_groups, nevent_groups + 1);
event_groups[nevent_groups].events = events;
nevent_groups++;
}
TraceEvent *trace_event_name(const char *name)
{
assert(name != NULL);
TraceEventIter iter;
TraceEvent *ev;
trace_event_iter_init(&iter, NULL);
while ((ev = trace_event_iter_next(&iter)) != NULL) {
if (strcmp(trace_event_get_name(ev), name) == 0) {
return ev;
}
}
return NULL;
}
void trace_event_iter_init(TraceEventIter *iter, const char *pattern)
{
iter->event = 0;
iter->group = 0;
iter->pattern = pattern;
}
TraceEvent *trace_event_iter_next(TraceEventIter *iter)
{
while (iter->group < nevent_groups &&
event_groups[iter->group].events[iter->event] != NULL) {
TraceEvent *ev = event_groups[iter->group].events[iter->event];
iter->event++;
if (event_groups[iter->group].events[iter->event] == NULL) {
iter->event = 0;
iter->group++;
}
if (!iter->pattern ||
g_pattern_match_simple(iter->pattern, trace_event_get_name(ev))) {
return ev;
}
}
return NULL;
}
void trace_list_events(void)
{
TraceEventIter iter;
TraceEvent *ev;
trace_event_iter_init(&iter, NULL);
while ((ev = trace_event_iter_next(&iter)) != NULL) {
fprintf(stderr, "%s\n", trace_event_get_name(ev));
}
#ifdef CONFIG_TRACE_DTRACE
fprintf(stderr, "This list of names of trace points may be incomplete "
"when using the DTrace/SystemTap backends.\n"
"Run 'qemu-trace-stap list %s' to print the full list.\n",
error_get_progname());
#endif
}
static void do_trace_enable_events(const char *line_buf)
{
const bool enable = ('-' != line_buf[0]);
const char *line_ptr = enable ? line_buf : line_buf + 1;
TraceEventIter iter;
TraceEvent *ev;
bool is_pattern = trace_event_is_pattern(line_ptr);
trace_event_iter_init(&iter, line_ptr);
while ((ev = trace_event_iter_next(&iter)) != NULL) {
if (!trace_event_get_state_static(ev)) {
if (!is_pattern) {
warn_report("trace event '%s' is not traceable",
line_ptr);
return;
}
continue;
}
/* start tracing */
trace_event_set_state_dynamic(ev, enable);
if (!is_pattern) {
return;
}
}
if (!is_pattern) {
warn_report("trace event '%s' does not exist",
line_ptr);
}
}
void trace_enable_events(const char *line_buf)
{
if (is_help_option(line_buf)) {
trace_list_events();
if (cur_mon == NULL) {
exit(0);
}
} else {
do_trace_enable_events(line_buf);
}
}
static void trace_init_events(const char *fname)
{
Location loc;
FILE *fp;
char line_buf[1024];
size_t line_idx = 0;
if (fname == NULL) {
return;
}
loc_push_none(&loc);
loc_set_file(fname, 0);
fp = fopen(fname, "r");
if (!fp) {
error_report("%s", strerror(errno));
exit(1);
}
while (fgets(line_buf, sizeof(line_buf), fp)) {
loc_set_file(fname, ++line_idx);
size_t len = strlen(line_buf);
if (len > 1) { /* skip empty lines */
line_buf[len - 1] = '\0';
if ('#' == line_buf[0]) { /* skip commented lines */
continue;
}
trace_enable_events(line_buf);
}
}
if (fclose(fp) != 0) {
loc_set_file(fname, 0);
error_report("%s", strerror(errno));
exit(1);
}
loc_pop(&loc);
}
void trace_init_file(const char *file)
{
#ifdef CONFIG_TRACE_SIMPLE
st_set_trace_file(file);
#elif defined CONFIG_TRACE_LOG
/* If both the simple and the log backends are enabled, "--trace file"
* only applies to the simple backend; use "-D" for the log backend.
*/
qemu_set_log_filename(file, &error_fatal);
#else
if (file) {
fprintf(stderr, "error: --trace file=...: "
"option not supported by the selected tracing backends\n");
exit(1);
}
#endif
}
void trace_fini_vcpu(CPUState *vcpu)
{
TraceEventIter iter;
TraceEvent *ev;
trace_guest_cpu_exit(vcpu);
trace_event_iter_init(&iter, NULL);
while ((ev = trace_event_iter_next(&iter)) != NULL) {
if (trace_event_is_vcpu(ev) &&
trace_event_get_state_static(ev) &&
trace_event_get_vcpu_state_dynamic(vcpu, ev)) {
/* must disable to affect the global counter */
trace_event_set_vcpu_state_dynamic(vcpu, ev, false);
}
}
}
bool trace_init_backends(void)
{
#ifdef CONFIG_TRACE_SIMPLE
if (!st_init()) {
fprintf(stderr, "failed to initialize simple tracing backend.\n");
return false;
}
#endif
#ifdef CONFIG_TRACE_FTRACE
if (!ftrace_init()) {
fprintf(stderr, "failed to initialize ftrace backend.\n");
return false;
}
#endif
#ifdef CONFIG_TRACE_SYSLOG
openlog(NULL, LOG_PID, LOG_DAEMON);
#endif
return true;
}
char *trace_opt_parse(const char *optarg)
{
char *trace_file;
QemuOpts *opts = qemu_opts_parse_noisily(qemu_find_opts("trace"),
optarg, true);
if (!opts) {
exit(1);
}
if (qemu_opt_get(opts, "enable")) {
trace_enable_events(qemu_opt_get(opts, "enable"));
}
trace_init_events(qemu_opt_get(opts, "events"));
trace_file = g_strdup(qemu_opt_get(opts, "file"));
qemu_opts_del(opts);
return trace_file;
}
uint32_t trace_get_vcpu_event_count(void)
{
return next_vcpu_id;
}
|