diff options
Diffstat (limited to 'qemu/hw/watchdog/watchdog.c')
| -rw-r--r-- | qemu/hw/watchdog/watchdog.c | 152 |
1 files changed, 152 insertions, 0 deletions
diff --git a/qemu/hw/watchdog/watchdog.c b/qemu/hw/watchdog/watchdog.c new file mode 100644 index 000000000..8d4b0eeeb --- /dev/null +++ b/qemu/hw/watchdog/watchdog.c @@ -0,0 +1,152 @@ +/* + * 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-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" + +/* 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. */ +#define WDT_NMI 7 /* Inject nmi into the guest */ + +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 (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) +{ + 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 if (strcasecmp(p, "inject-nmi") == 0) + watchdog_action = WDT_NMI; + else + return -1; + + return 0; +} + +/* 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 */ + qapi_event_send_watchdog(WATCHDOG_EXPIRATION_ACTION_RESET, &error_abort); + qemu_system_reset_request(); + break; + + case WDT_SHUTDOWN: /* same as 'system_powerdown' in monitor */ + qapi_event_send_watchdog(WATCHDOG_EXPIRATION_ACTION_SHUTDOWN, &error_abort); + qemu_system_powerdown_request(); + break; + + case WDT_POWEROFF: /* same as 'quit' command in monitor */ + qapi_event_send_watchdog(WATCHDOG_EXPIRATION_ACTION_POWEROFF, &error_abort); + exit(0); + + case WDT_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_EXPIRATION_ACTION_PAUSE, &error_abort); + qemu_system_vmstop_request(RUN_STATE_WATCHDOG); + break; + + case WDT_DEBUG: + qapi_event_send_watchdog(WATCHDOG_EXPIRATION_ACTION_DEBUG, &error_abort); + fprintf(stderr, "watchdog: timer fired\n"); + break; + + case WDT_NONE: + qapi_event_send_watchdog(WATCHDOG_EXPIRATION_ACTION_NONE, &error_abort); + break; + + case WDT_NMI: + qapi_event_send_watchdog(WATCHDOG_EXPIRATION_ACTION_INJECT_NMI, + &error_abort); + inject_nmi(); + break; + } +} |