/* * 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 "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_device_opts, 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; } /* 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 */ qemu_system_reset_request(); break; case WDT_SHUTDOWN: /* same as 'system_powerdown' in monitor */ qemu_system_powerdown_request(); break; case WDT_POWEROFF: /* same as 'quit' command in monitor */ exit(0); break; case WDT_PAUSE: /* same as 'stop' command in monitor */ vm_stop(0); break; case WDT_DEBUG: fprintf(stderr, "watchdog: timer fired\n"); break; case WDT_NONE: break; } }