xref: /openbmc/qemu/trace/qmp.c (revision ddbb0d09)
1 /*
2  * QMP commands for tracing events.
3  *
4  * Copyright (C) 2014 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/typedefs.h"
11 #include "qmp-commands.h"
12 #include "trace/control.h"
13 
14 
15 TraceEventInfoList *qmp_trace_event_get_state(const char *name, Error **errp)
16 {
17     TraceEventInfoList *events = NULL;
18     bool found = false;
19     TraceEvent *ev;
20 
21     ev = NULL;
22     while ((ev = trace_event_pattern(name, ev)) != NULL) {
23         TraceEventInfoList *elem = g_new(TraceEventInfoList, 1);
24         elem->value = g_new(TraceEventInfo, 1);
25         elem->value->name = g_strdup(trace_event_get_name(ev));
26         if (!trace_event_get_state_static(ev)) {
27             elem->value->state = TRACE_EVENT_STATE_UNAVAILABLE;
28         } else if (!trace_event_get_state_dynamic(ev)) {
29             elem->value->state = TRACE_EVENT_STATE_DISABLED;
30         } else {
31             elem->value->state = TRACE_EVENT_STATE_ENABLED;
32         }
33         elem->next = events;
34         events = elem;
35         found = true;
36     }
37 
38     if (!found && !trace_event_is_pattern(name)) {
39         error_setg(errp, "unknown event \"%s\"", name);
40     }
41 
42     return events;
43 }
44 
45 void qmp_trace_event_set_state(const char *name, bool enable,
46                                bool has_ignore_unavailable,
47                                bool ignore_unavailable, Error **errp)
48 {
49     bool found = false;
50     TraceEvent *ev;
51 
52     /* Check all selected events are dynamic */
53     ev = NULL;
54     while ((ev = trace_event_pattern(name, ev)) != NULL) {
55         found = true;
56         if (!(has_ignore_unavailable && ignore_unavailable) &&
57             !trace_event_get_state_static(ev)) {
58             error_setg(errp, "cannot set dynamic tracing state for \"%s\"",
59                        trace_event_get_name(ev));
60             return;
61         }
62     }
63     if (!found && !trace_event_is_pattern(name)) {
64         error_setg(errp, "unknown event \"%s\"", name);
65         return;
66     }
67 
68     /* Apply changes */
69     ev = NULL;
70     while ((ev = trace_event_pattern(name, ev)) != NULL) {
71         if (trace_event_get_state_static(ev)) {
72             trace_event_set_state_dynamic(ev, enable);
73         }
74     }
75 }
76