LXR qemu/hw/watchdog/watchdog.c

   1/*
   2 * Virtual hardware watchdog.
   3 *
   4 * Copyright (C) 2009 Red Hat Inc.
   5 *
   6 * This program is free software; you can redistribute it and/or
   7 * modify it under the terms of the GNU General Public License
   8 * as published by the Free Software Foundation; either version 2
   9 * of the License, or (at your option) any later version.
  10 *
  11 * This program is distributed in the hope that it will be useful,
  12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 * GNU General Public License for more details.
  15 *
  16 * You should have received a copy of the GNU General Public License
  17 * along with this program; if not, see <http://www.gnu.org/licenses/>.
  18 *
  19 * By Richard W.M. Jones (rjones@redhat.com).
  20 */
  21
  22#include "qemu/osdep.h"
  23#include "qemu/option.h"
  24#include "qemu/config-file.h"
  25#include "qemu/queue.h"
  26#include "qapi/error.h"
  27#include "qapi/qapi-commands-run-state.h"
  28#include "qapi/qapi-events-run-state.h"
  29#include "sysemu/runstate.h"
  30#include "sysemu/watchdog.h"
  31#include "hw/nmi.h"
  32#include "qemu/help_option.h"
  33#include "trace.h"
  34
  35static WatchdogAction watchdog_action = WATCHDOG_ACTION_RESET;
  36
  37WatchdogAction get_watchdog_action(void)
  38{
  39    return watchdog_action;
  40}
  41
  42/* This actually performs the "action" once a watchdog has expired,
  43 * ie. reboot, shutdown, exit, etc.
  44 */
  45void watchdog_perform_action(void)
  46{
  47    trace_watchdog_perform_action(watchdog_action);
  48
  49    switch (watchdog_action) {
  50    case WATCHDOG_ACTION_RESET:     /* same as 'system_reset' in monitor */
  51        qapi_event_send_watchdog(WATCHDOG_ACTION_RESET);
  52        qemu_system_reset_request(SHUTDOWN_CAUSE_GUEST_RESET);
  53        break;
  54
  55    case WATCHDOG_ACTION_SHUTDOWN:  /* same as 'system_powerdown' in monitor */
  56        qapi_event_send_watchdog(WATCHDOG_ACTION_SHUTDOWN);
  57        qemu_system_powerdown_request();
  58        break;
  59
  60    case WATCHDOG_ACTION_POWEROFF:  /* same as 'quit' command in monitor */
  61        qapi_event_send_watchdog(WATCHDOG_ACTION_POWEROFF);
  62        exit(0);
  63
  64    case WATCHDOG_ACTION_PAUSE:     /* same as 'stop' command in monitor */
  65        /* In a timer callback, when vm_stop calls qemu_clock_enable
  66         * you would get a deadlock.  Bypass the problem.
  67         */
  68        qemu_system_vmstop_request_prepare();
  69        qapi_event_send_watchdog(WATCHDOG_ACTION_PAUSE);
  70        qemu_system_vmstop_request(RUN_STATE_WATCHDOG);
  71        break;
  72
  73    case WATCHDOG_ACTION_DEBUG:
  74        qapi_event_send_watchdog(WATCHDOG_ACTION_DEBUG);
  75        fprintf(stderr, "watchdog: timer fired\n");
  76        break;
  77
  78    case WATCHDOG_ACTION_NONE:
  79        qapi_event_send_watchdog(WATCHDOG_ACTION_NONE);
  80        break;
  81
  82    case WATCHDOG_ACTION_INJECT_NMI:
  83        qapi_event_send_watchdog(WATCHDOG_ACTION_INJECT_NMI);
  84        nmi_monitor_handle(0, NULL);
  85        break;
  86
  87    default:
  88        assert(0);
  89    }
  90}
  91
  92void qmp_watchdog_set_action(WatchdogAction action, Error **errp)
  93{
  94    watchdog_action = action;
  95    trace_watchdog_set_action(watchdog_action);
  96}
  97