LXR qemu/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
  15TraceEventInfoList *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
  45void 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