2 * Interface for configuring and controlling the state of tracing events.
4 * Copyright (C) 2011-2014 LluĂs Vilanova <vilanova@ac.upc.edu>
6 * This work is licensed under the terms of the GNU GPL, version 2 or later.
7 * See the COPYING file in the top-level directory.
10 #include "trace/control.h"
11 #ifdef CONFIG_TRACE_SIMPLE
12 #include "trace/simple.h"
14 #ifdef CONFIG_TRACE_FTRACE
15 #include "trace/ftrace.h"
17 #ifdef CONFIG_TRACE_LOG
20 #include "qemu/error-report.h"
22 int trace_events_enabled_count
;
23 bool trace_events_dstate
[TRACE_EVENT_COUNT
];
25 TraceEvent
*trace_event_name(const char *name
)
30 for (i
= 0; i
< trace_event_count(); i
++) {
31 TraceEvent
*ev
= trace_event_id(i
);
32 if (strcmp(trace_event_get_name(ev
), name
) == 0) {
39 static bool pattern_glob(const char *pat
, const char *ev
)
41 while (*pat
!= '\0' && *ev
!= '\0') {
46 else if (*pat
== '*') {
47 if (pattern_glob(pat
, ev
+1)) {
49 } else if (pattern_glob(pat
+1, ev
)) {
63 if (*pat
== '\0' && *ev
== '\0') {
70 TraceEvent
*trace_event_pattern(const char *pat
, TraceEvent
*ev
)
79 i
= trace_event_get_id(ev
);
83 while (i
< trace_event_count()) {
84 TraceEvent
*res
= trace_event_id(i
);
85 if (pattern_glob(pat
, trace_event_get_name(res
))) {
94 void trace_list_events(void)
97 for (i
= 0; i
< trace_event_count(); i
++) {
98 TraceEvent
*res
= trace_event_id(i
);
99 fprintf(stderr
, "%s\n", trace_event_get_name(res
));
103 static void do_trace_enable_events(const char *line_buf
)
105 const bool enable
= ('-' != line_buf
[0]);
106 const char *line_ptr
= enable
? line_buf
: line_buf
+ 1;
108 if (trace_event_is_pattern(line_ptr
)) {
109 TraceEvent
*ev
= NULL
;
110 while ((ev
= trace_event_pattern(line_ptr
, ev
)) != NULL
) {
111 if (trace_event_get_state_static(ev
)) {
112 trace_event_set_state_dynamic(ev
, enable
);
116 TraceEvent
*ev
= trace_event_name(line_ptr
);
118 error_report("WARNING: trace event '%s' does not exist",
120 } else if (!trace_event_get_state_static(ev
)) {
121 error_report("WARNING: trace event '%s' is not traceable",
124 trace_event_set_state_dynamic(ev
, enable
);
129 void trace_enable_events(const char *line_buf
)
131 if (is_help_option(line_buf
)) {
135 do_trace_enable_events(line_buf
);
139 void trace_init_events(const char *fname
)
151 loc_set_file(fname
, 0);
152 fp
= fopen(fname
, "r");
154 error_report("%s", strerror(errno
));
157 while (fgets(line_buf
, sizeof(line_buf
), fp
)) {
158 loc_set_file(fname
, ++line_idx
);
159 size_t len
= strlen(line_buf
);
160 if (len
> 1) { /* skip empty lines */
161 line_buf
[len
- 1] = '\0';
162 if ('#' == line_buf
[0]) { /* skip commented lines */
165 trace_enable_events(line_buf
);
168 if (fclose(fp
) != 0) {
169 loc_set_file(fname
, 0);
170 error_report("%s", strerror(errno
));
176 void trace_init_file(const char *file
)
178 #ifdef CONFIG_TRACE_SIMPLE
179 st_set_trace_file(file
);
180 #elif defined CONFIG_TRACE_LOG
181 /* If both the simple and the log backends are enabled, "-trace file"
182 * only applies to the simple backend; use "-D" for the log backend.
185 qemu_set_log_filename(file
);
189 fprintf(stderr
, "error: -trace file=...: "
190 "option not supported by the selected tracing backends\n");
196 bool trace_init_backends(void)
198 #ifdef CONFIG_TRACE_SIMPLE
200 fprintf(stderr
, "failed to initialize simple tracing backend.\n");
205 #ifdef CONFIG_TRACE_FTRACE
206 if (!ftrace_init()) {
207 fprintf(stderr
, "failed to initialize ftrace backend.\n");