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-file.h" 25 #include "qemu/queue.h" 26 #include "qapi/qmp/types.h" 27 #include "sysemu/sysemu.h" 28 #include "sysemu/watchdog.h" 29 #include "qapi-event.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 39 static int watchdog_action = WDT_RESET; 40 static QLIST_HEAD(watchdog_list, WatchdogTimerModel) watchdog_list; 41 42 void 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 */ 52 int select_watchdog(const char *p) 53 { 54 WatchdogTimerModel *model; 55 QemuOpts *opts; 56 57 /* -watchdog ? lists available devices and exits cleanly. */ 58 if (is_help_option(p)) { 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 &error_abort); 71 qemu_opt_set(opts, "driver", p); 72 return 0; 73 } 74 } 75 76 fprintf(stderr, "Unknown -watchdog device. Supported devices are:\n"); 77 QLIST_FOREACH(model, &watchdog_list, entry) { 78 fprintf(stderr, "\t%s\t%s\n", 79 model->wdt_name, model->wdt_description); 80 } 81 return 1; 82 } 83 84 int select_watchdog_action(const char *p) 85 { 86 if (strcasecmp(p, "reset") == 0) 87 watchdog_action = WDT_RESET; 88 else if (strcasecmp(p, "shutdown") == 0) 89 watchdog_action = WDT_SHUTDOWN; 90 else if (strcasecmp(p, "poweroff") == 0) 91 watchdog_action = WDT_POWEROFF; 92 else if (strcasecmp(p, "pause") == 0) 93 watchdog_action = WDT_PAUSE; 94 else if (strcasecmp(p, "debug") == 0) 95 watchdog_action = WDT_DEBUG; 96 else if (strcasecmp(p, "none") == 0) 97 watchdog_action = WDT_NONE; 98 else 99 return -1; 100 101 return 0; 102 } 103 104 /* This actually performs the "action" once a watchdog has expired, 105 * ie. reboot, shutdown, exit, etc. 106 */ 107 void watchdog_perform_action(void) 108 { 109 switch (watchdog_action) { 110 case WDT_RESET: /* same as 'system_reset' in monitor */ 111 qapi_event_send_watchdog(WATCHDOG_EXPIRATION_ACTION_RESET, &error_abort); 112 qemu_system_reset_request(); 113 break; 114 115 case WDT_SHUTDOWN: /* same as 'system_powerdown' in monitor */ 116 qapi_event_send_watchdog(WATCHDOG_EXPIRATION_ACTION_SHUTDOWN, &error_abort); 117 qemu_system_powerdown_request(); 118 break; 119 120 case WDT_POWEROFF: /* same as 'quit' command in monitor */ 121 qapi_event_send_watchdog(WATCHDOG_EXPIRATION_ACTION_POWEROFF, &error_abort); 122 exit(0); 123 124 case WDT_PAUSE: /* same as 'stop' command in monitor */ 125 /* In a timer callback, when vm_stop calls qemu_clock_enable 126 * you would get a deadlock. Bypass the problem. 127 */ 128 qemu_system_vmstop_request_prepare(); 129 qapi_event_send_watchdog(WATCHDOG_EXPIRATION_ACTION_PAUSE, &error_abort); 130 qemu_system_vmstop_request(RUN_STATE_WATCHDOG); 131 break; 132 133 case WDT_DEBUG: 134 qapi_event_send_watchdog(WATCHDOG_EXPIRATION_ACTION_DEBUG, &error_abort); 135 fprintf(stderr, "watchdog: timer fired\n"); 136 break; 137 138 case WDT_NONE: 139 qapi_event_send_watchdog(WATCHDOG_EXPIRATION_ACTION_NONE, &error_abort); 140 break; 141 } 142 } 143