Archipelago » qemu

/*

 * Virtual hardware watchdog.

 *

 * Copyright (C) 2009 Red Hat Inc.

 *

 * This program is free software; you can redistribute it and/or

 * modify it under the terms of the GNU General Public License

 * as published by the Free Software Foundation; either version 2

 * of the License, or (at your option) any later version.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, see <http://www.gnu.org/licenses/>.

 *

 * By Richard W.M. Jones (rjones@redhat.com).

 */

#include "qemu-common.h"

#include "qemu-option.h"

#include "qemu-config.h"

#include "qemu-queue.h"

#include "qemu-objects.h"

#include "monitor.h"

#include "sysemu.h"

#include "hw/watchdog.h"

/* Possible values for action parameter. */

#define WDT_RESET        1        /* Hard reset. */

#define WDT_SHUTDOWN     2        /* Shutdown. */

#define WDT_POWEROFF     3        /* Quit. */

#define WDT_PAUSE        4        /* Pause. */

#define WDT_DEBUG        5        /* Prints a message and continues running. */

#define WDT_NONE         6        /* Do nothing. */

static int watchdog_action = WDT_RESET;

static QLIST_HEAD(watchdog_list, WatchdogTimerModel) watchdog_list;

void watchdog_add_model(WatchdogTimerModel *model)

{

    QLIST_INSERT_HEAD(&watchdog_list, model, entry);

}

/* Returns:

 *   0 = continue

 *   1 = exit program with error

 *   2 = exit program without error

 */

int select_watchdog(const char *p)

{

    WatchdogTimerModel *model;

    QemuOpts *opts;

    /* -watchdog ? lists available devices and exits cleanly. */

    if (strcmp(p, "?") == 0) {

        QLIST_FOREACH(model, &watchdog_list, entry) {

            fprintf(stderr, "\t%s\t%s\n",

                     model->wdt_name, model->wdt_description);

        }

        return 2;

    }

    QLIST_FOREACH(model, &watchdog_list, entry) {

        if (strcasecmp(model->wdt_name, p) == 0) {

            /* add the device */

            opts = qemu_opts_create(qemu_find_opts("device"), NULL, 0);

            qemu_opt_set(opts, "driver", p);

            return 0;

        }

    }

    fprintf(stderr, "Unknown -watchdog device. Supported devices are:\n");

    QLIST_FOREACH(model, &watchdog_list, entry) {

        fprintf(stderr, "\t%s\t%s\n",

                 model->wdt_name, model->wdt_description);

    }

    return 1;

}

int select_watchdog_action(const char *p)

{

    if (strcasecmp(p, "reset") == 0)

        watchdog_action = WDT_RESET;

    else if (strcasecmp(p, "shutdown") == 0)

        watchdog_action = WDT_SHUTDOWN;

    else if (strcasecmp(p, "poweroff") == 0)

        watchdog_action = WDT_POWEROFF;

    else if (strcasecmp(p, "pause") == 0)

        watchdog_action = WDT_PAUSE;

    else if (strcasecmp(p, "debug") == 0)

        watchdog_action = WDT_DEBUG;

    else if (strcasecmp(p, "none") == 0)

        watchdog_action = WDT_NONE;

    else

        return -1;

    return 0;

}

static void watchdog_mon_event(const char *action)

{

    QObject *data;

    data = qobject_from_jsonf("{ 'action': %s }", action);

    monitor_protocol_event(QEVENT_WATCHDOG, data);

    qobject_decref(data);

}

/* This actually performs the "action" once a watchdog has expired,

 * ie. reboot, shutdown, exit, etc.

 */

void watchdog_perform_action(void)

{

    switch(watchdog_action) {

    case WDT_RESET:             /* same as 'system_reset' in monitor */

        watchdog_mon_event("reset");

        qemu_system_reset_request();

        break;

    case WDT_SHUTDOWN:          /* same as 'system_powerdown' in monitor */

        watchdog_mon_event("shutdown");

        qemu_system_powerdown_request();

        break;

    case WDT_POWEROFF:          /* same as 'quit' command in monitor */

        watchdog_mon_event("poweroff");

        exit(0);

        break;

    case WDT_PAUSE:             /* same as 'stop' command in monitor */

        watchdog_mon_event("pause");

        vm_stop(0);

        break;

    case WDT_DEBUG:

        watchdog_mon_event("debug");

        fprintf(stderr, "watchdog: timer fired\n");

        break;

    case WDT_NONE:

        watchdog_mon_event("none");

        break;

    }

}