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/osdep.h" 23 #include "qemu/option.h" 24 #include "qemu/config-file.h" 25 #include "qemu/queue.h" 26 #include "qapi/error.h" 27 #include "qapi/qapi-commands-run-state.h" 28 #include "qapi/qapi-events-run-state.h" 29 #include "sysemu/sysemu.h" 30 #include "sysemu/watchdog.h" 31 #include "hw/nmi.h" 32 #include "qemu/help_option.h" 33 34 static WatchdogAction watchdog_action = WATCHDOG_ACTION_RESET; 35 static QLIST_HEAD(watchdog_list, WatchdogTimerModel) watchdog_list; 36 37 void watchdog_add_model(WatchdogTimerModel *model) 38 { 39 QLIST_INSERT_HEAD(&watchdog_list, model, entry); 40 } 41 42 /* Returns: 43 * 0 = continue 44 * 1 = exit program with error 45 * 2 = exit program without error 46 */ 47 int select_watchdog(const char *p) 48 { 49 WatchdogTimerModel *model; 50 QemuOpts *opts; 51 52 /* -watchdog ? lists available devices and exits cleanly. */ 53 if (is_help_option(p)) { 54 QLIST_FOREACH(model, &watchdog_list, entry) { 55 fprintf(stderr, "\t%s\t%s\n", 56 model->wdt_name, model->wdt_description); 57 } 58 return 2; 59 } 60 61 QLIST_FOREACH(model, &watchdog_list, entry) { 62 if (strcasecmp(model->wdt_name, p) == 0) { 63 /* add the device */ 64 opts = qemu_opts_create(qemu_find_opts("device"), NULL, 0, 65 &error_abort); 66 qemu_opt_set(opts, "driver", p, &error_abort); 67 return 0; 68 } 69 } 70 71 fprintf(stderr, "Unknown -watchdog device. Supported devices are:\n"); 72 QLIST_FOREACH(model, &watchdog_list, entry) { 73 fprintf(stderr, "\t%s\t%s\n", 74 model->wdt_name, model->wdt_description); 75 } 76 return 1; 77 } 78 79 int select_watchdog_action(const char *p) 80 { 81 int action; 82 char *qapi_value; 83 84 qapi_value = g_ascii_strdown(p, -1); 85 action = qapi_enum_parse(&WatchdogAction_lookup, qapi_value, -1, NULL); 86 g_free(qapi_value); 87 if (action < 0) 88 return -1; 89 qmp_watchdog_set_action(action, &error_abort); 90 return 0; 91 } 92 93 WatchdogAction get_watchdog_action(void) 94 { 95 return watchdog_action; 96 } 97 98 /* This actually performs the "action" once a watchdog has expired, 99 * ie. reboot, shutdown, exit, etc. 100 */ 101 void watchdog_perform_action(void) 102 { 103 switch (watchdog_action) { 104 case WATCHDOG_ACTION_RESET: /* same as 'system_reset' in monitor */ 105 qapi_event_send_watchdog(WATCHDOG_ACTION_RESET); 106 qemu_system_reset_request(SHUTDOWN_CAUSE_GUEST_RESET); 107 break; 108 109 case WATCHDOG_ACTION_SHUTDOWN: /* same as 'system_powerdown' in monitor */ 110 qapi_event_send_watchdog(WATCHDOG_ACTION_SHUTDOWN); 111 qemu_system_powerdown_request(); 112 break; 113 114 case WATCHDOG_ACTION_POWEROFF: /* same as 'quit' command in monitor */ 115 qapi_event_send_watchdog(WATCHDOG_ACTION_POWEROFF); 116 exit(0); 117 118 case WATCHDOG_ACTION_PAUSE: /* same as 'stop' command in monitor */ 119 /* In a timer callback, when vm_stop calls qemu_clock_enable 120 * you would get a deadlock. Bypass the problem. 121 */ 122 qemu_system_vmstop_request_prepare(); 123 qapi_event_send_watchdog(WATCHDOG_ACTION_PAUSE); 124 qemu_system_vmstop_request(RUN_STATE_WATCHDOG); 125 break; 126 127 case WATCHDOG_ACTION_DEBUG: 128 qapi_event_send_watchdog(WATCHDOG_ACTION_DEBUG); 129 fprintf(stderr, "watchdog: timer fired\n"); 130 break; 131 132 case WATCHDOG_ACTION_NONE: 133 qapi_event_send_watchdog(WATCHDOG_ACTION_NONE); 134 break; 135 136 case WATCHDOG_ACTION_INJECT_NMI: 137 qapi_event_send_watchdog(WATCHDOG_ACTION_INJECT_NMI); 138 nmi_monitor_handle(0, NULL); 139 break; 140 141 default: 142 assert(0); 143 } 144 } 145 146 void qmp_watchdog_set_action(WatchdogAction action, Error **errp) 147 { 148 watchdog_action = action; 149 } 150