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/*
* 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/osdep.h"
#include "qemu/option.h"
#include "qemu/config-file.h"
#include "qemu/queue.h"
#include "qapi/qmp/types.h"
#include "sysemu/sysemu.h"
#include "sysemu/watchdog.h"
#include "qapi-event.h"
#include "hw/nmi.h"
#include "qemu/help_option.h"
static WatchdogAction watchdog_action = WATCHDOG_ACTION_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 (is_help_option(p)) {
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,
&error_abort);
qemu_opt_set(opts, "driver", p, &error_abort);
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)
{
int action;
char *qapi_value;
qapi_value = g_ascii_strdown(p, -1);
action = qapi_enum_parse(&WatchdogAction_lookup, qapi_value, -1, NULL);
g_free(qapi_value);
if (action < 0)
return -1;
watchdog_action = action;
return 0;
}
WatchdogAction get_watchdog_action(void)
{
return watchdog_action;
}
/* This actually performs the "action" once a watchdog has expired,
* ie. reboot, shutdown, exit, etc.
*/
void watchdog_perform_action(void)
{
switch (watchdog_action) {
case WATCHDOG_ACTION_RESET: /* same as 'system_reset' in monitor */
qapi_event_send_watchdog(WATCHDOG_ACTION_RESET, &error_abort);
qemu_system_reset_request(SHUTDOWN_CAUSE_GUEST_RESET);
break;
case WATCHDOG_ACTION_SHUTDOWN: /* same as 'system_powerdown' in monitor */
qapi_event_send_watchdog(WATCHDOG_ACTION_SHUTDOWN, &error_abort);
qemu_system_powerdown_request();
break;
case WATCHDOG_ACTION_POWEROFF: /* same as 'quit' command in monitor */
qapi_event_send_watchdog(WATCHDOG_ACTION_POWEROFF, &error_abort);
exit(0);
case WATCHDOG_ACTION_PAUSE: /* same as 'stop' command in monitor */
/* In a timer callback, when vm_stop calls qemu_clock_enable
* you would get a deadlock. Bypass the problem.
*/
qemu_system_vmstop_request_prepare();
qapi_event_send_watchdog(WATCHDOG_ACTION_PAUSE, &error_abort);
qemu_system_vmstop_request(RUN_STATE_WATCHDOG);
break;
case WATCHDOG_ACTION_DEBUG:
qapi_event_send_watchdog(WATCHDOG_ACTION_DEBUG, &error_abort);
fprintf(stderr, "watchdog: timer fired\n");
break;
case WATCHDOG_ACTION_NONE:
qapi_event_send_watchdog(WATCHDOG_ACTION_NONE, &error_abort);
break;
case WATCHDOG_ACTION_INJECT_NMI:
qapi_event_send_watchdog(WATCHDOG_ACTION_INJECT_NMI,
&error_abort);
nmi_monitor_handle(0, NULL);
break;
default:
assert(0);
}
}
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