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 "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 }