trace/qmp.c

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