LXR qemu/hw/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-common.h"
  23#include "qemu-option.h"
  24#include "qemu-config.h"
  25#include "qemu-queue.h"
  26#include "qemu-objects.h"
  27#include "monitor.h"
  28#include "sysemu.h"
  29#include "hw/watchdog.h"
  30
  31/* Possible values for action parameter. */
  32#define WDT_RESET        1      /* Hard reset. */
  33#define WDT_SHUTDOWN     2      /* Shutdown. */
  34#define WDT_POWEROFF     3      /* Quit. */
  35#define WDT_PAUSE        4      /* Pause. */
  36#define WDT_DEBUG        5      /* Prints a message and continues running. */
  37#define WDT_NONE         6      /* Do nothing. */
  38
  39static int watchdog_action = WDT_RESET;
  40static QLIST_HEAD(watchdog_list, WatchdogTimerModel) watchdog_list;
  41
  42void watchdog_add_model(WatchdogTimerModel *model)
  43{
  44    QLIST_INSERT_HEAD(&watchdog_list, model, entry);
  45}
  46
  47/* Returns:
  48 *   0 = continue
  49 *   1 = exit program with error
  50 *   2 = exit program without error
  51 */
  52int select_watchdog(const char *p)
  53{
  54    WatchdogTimerModel *model;
  55    QemuOpts *opts;
  56
  57    /* -watchdog ? lists available devices and exits cleanly. */
  58    if (strcmp(p, "?") == 0) {
  59        QLIST_FOREACH(model, &watchdog_list, entry) {
  60            fprintf(stderr, "\t%s\t%s\n",
  61                     model->wdt_name, model->wdt_description);
  62        }
  63        return 2;
  64    }
  65
  66    QLIST_FOREACH(model, &watchdog_list, entry) {
  67        if (strcasecmp(model->wdt_name, p) == 0) {
  68            /* add the device */
  69            opts = qemu_opts_create(qemu_find_opts("device"), NULL, 0);
  70            qemu_opt_set(opts, "driver", p);
  71            return 0;
  72        }
  73    }
  74
  75    fprintf(stderr, "Unknown -watchdog device. Supported devices are:\n");
  76    QLIST_FOREACH(model, &watchdog_list, entry) {
  77        fprintf(stderr, "\t%s\t%s\n",
  78                 model->wdt_name, model->wdt_description);
  79    }
  80    return 1;
  81}
  82
  83int select_watchdog_action(const char *p)
  84{
  85    if (strcasecmp(p, "reset") == 0)
  86        watchdog_action = WDT_RESET;
  87    else if (strcasecmp(p, "shutdown") == 0)
  88        watchdog_action = WDT_SHUTDOWN;
  89    else if (strcasecmp(p, "poweroff") == 0)
  90        watchdog_action = WDT_POWEROFF;
  91    else if (strcasecmp(p, "pause") == 0)
  92        watchdog_action = WDT_PAUSE;
  93    else if (strcasecmp(p, "debug") == 0)
  94        watchdog_action = WDT_DEBUG;
  95    else if (strcasecmp(p, "none") == 0)
  96        watchdog_action = WDT_NONE;
  97    else
  98        return -1;
  99
 100    return 0;
 101}
 102
 103static void watchdog_mon_event(const char *action)
 104{
 105    QObject *data;
 106
 107    data = qobject_from_jsonf("{ 'action': %s }", action);
 108    monitor_protocol_event(QEVENT_WATCHDOG, data);
 109    qobject_decref(data);
 110}
 111
 112/* This actually performs the "action" once a watchdog has expired,
 113 * ie. reboot, shutdown, exit, etc.
 114 */
 115void watchdog_perform_action(void)
 116{
 117    switch(watchdog_action) {
 118    case WDT_RESET:             /* same as 'system_reset' in monitor */
 119        watchdog_mon_event("reset");
 120        qemu_system_reset_request();
 121        break;
 122
 123    case WDT_SHUTDOWN:          /* same as 'system_powerdown' in monitor */
 124        watchdog_mon_event("shutdown");
 125        qemu_system_powerdown_request();
 126        break;
 127
 128    case WDT_POWEROFF:          /* same as 'quit' command in monitor */
 129        watchdog_mon_event("poweroff");
 130        exit(0);
 131        break;
 132
 133    case WDT_PAUSE:             /* same as 'stop' command in monitor */
 134        watchdog_mon_event("pause");
 135        vm_stop(RUN_STATE_WATCHDOG);
 136        break;
 137
 138    case WDT_DEBUG:
 139        watchdog_mon_event("debug");
 140        fprintf(stderr, "watchdog: timer fired\n");
 141        break;
 142
 143    case WDT_NONE:
 144        watchdog_mon_event("none");
 145        break;
 146    }
 147}
 148