1 /*
2 * QMP commands for tracing events.
3 *
4 * Copyright (C) 2014-2016 Lluís Vilanova <vilanova@ac.upc.edu>
5 *
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.
8 */
9
10 #include "qemu/osdep.h"
11 #include "qapi/error.h"
12 #include "qapi/qapi-commands-trace.h"
13 #include "control.h"
14
15
check_events(bool ignore_unavailable,bool is_pattern,const char * name,Error ** errp)16 static bool check_events(bool ignore_unavailable, bool is_pattern,
17 const char *name, Error **errp)
18 {
19 if (!is_pattern) {
20 TraceEvent *ev = trace_event_name(name);
21
22 /* error for non-existing event */
23 if (ev == NULL) {
24 error_setg(errp, "unknown event \"%s\"", name);
25 return false;
26 }
27
28 /* error for unavailable event */
29 if (!ignore_unavailable && !trace_event_get_state_static(ev)) {
30 error_setg(errp, "event \"%s\" is disabled", name);
31 return false;
32 }
33
34 return true;
35 } else {
36 /* error for unavailable events */
37 TraceEventIter iter;
38 TraceEvent *ev;
39 trace_event_iter_init_pattern(&iter, name);
40 while ((ev = trace_event_iter_next(&iter)) != NULL) {
41 if (!ignore_unavailable && !trace_event_get_state_static(ev)) {
42 error_setg(errp, "event \"%s\" is disabled", trace_event_get_name(ev));
43 return false;
44 }
45 }
46 return true;
47 }
48 }
49
qmp_trace_event_get_state(const char * name,Error ** errp)50 TraceEventInfoList *qmp_trace_event_get_state(const char *name,
51 Error **errp)
52 {
53 TraceEventInfoList *events = NULL;
54 TraceEventIter iter;
55 TraceEvent *ev;
56 bool is_pattern = trace_event_is_pattern(name);
57
58 /* Check events */
59 if (!check_events(true, is_pattern, name, errp)) {
60 return NULL;
61 }
62
63 /* Get states (all errors checked above) */
64 trace_event_iter_init_pattern(&iter, name);
65 while ((ev = trace_event_iter_next(&iter)) != NULL) {
66 TraceEventInfo *value;
67
68 value = g_new(TraceEventInfo, 1);
69 value->name = g_strdup(trace_event_get_name(ev));
70
71 if (!trace_event_get_state_static(ev)) {
72 value->state = TRACE_EVENT_STATE_UNAVAILABLE;
73 } else {
74 if (trace_event_get_state_dynamic(ev)) {
75 value->state = TRACE_EVENT_STATE_ENABLED;
76 } else {
77 value->state = TRACE_EVENT_STATE_DISABLED;
78 }
79 }
80 QAPI_LIST_PREPEND(events, value);
81 }
82
83 return events;
84 }
85
qmp_trace_event_set_state(const char * name,bool enable,bool has_ignore_unavailable,bool ignore_unavailable,Error ** errp)86 void qmp_trace_event_set_state(const char *name, bool enable,
87 bool has_ignore_unavailable, bool ignore_unavailable,
88 Error **errp)
89 {
90 TraceEventIter iter;
91 TraceEvent *ev;
92 bool is_pattern = trace_event_is_pattern(name);
93
94 /* Check events */
95 if (!check_events(has_ignore_unavailable && ignore_unavailable,
96 is_pattern, name, errp)) {
97 return;
98 }
99
100 /* Apply changes (all errors checked above) */
101 trace_event_iter_init_pattern(&iter, name);
102 while ((ev = trace_event_iter_next(&iter)) != NULL) {
103 if (!trace_event_get_state_static(ev)) {
104 continue;
105 }
106 trace_event_set_state_dynamic(ev, enable);
107 }
108 }
109