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, write to the Free Software 18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, 19 * USA. 20 * 21 * By Richard W.M. Jones (rjones (at) redhat.com). 22 */ 23 24 #include "qemu-common.h" 25 #include "sys-queue.h" 26 #include "sysemu.h" 27 #include "hw/watchdog.h" 28 29 static LIST_HEAD(watchdog_list, WatchdogTimerModel) watchdog_list; 30 31 void watchdog_add_model(WatchdogTimerModel *model) 32 { 33 LIST_INSERT_HEAD(&watchdog_list, model, entry); 34 } 35 36 /* Returns: 37 * 0 = continue 38 * 1 = exit program with error 39 * 2 = exit program without error 40 */ 41 int select_watchdog(const char *p) 42 { 43 WatchdogTimerModel *model; 44 45 if (watchdog) { 46 fprintf(stderr, 47 "qemu: only one watchdog option may be given\n"); 48 return 1; 49 } 50 51 /* -watchdog ? lists available devices and exits cleanly. */ 52 if (strcmp(p, "?") == 0) { 53 LIST_FOREACH(model, &watchdog_list, entry) { 54 fprintf(stderr, "\t%s\t%s\n", 55 model->wdt_name, model->wdt_description); 56 } 57 return 2; 58 } 59 60 LIST_FOREACH(model, &watchdog_list, entry) { 61 if (strcasecmp(model->wdt_name, p) == 0) { 62 watchdog = model; 63 return 0; 64 } 65 } 66 67 fprintf(stderr, "Unknown -watchdog device. Supported devices are:\n"); 68 LIST_FOREACH(model, &watchdog_list, entry) { 69 fprintf(stderr, "\t%s\t%s\n", 70 model->wdt_name, model->wdt_description); 71 } 72 return 1; 73 } 74 75 int select_watchdog_action(const char *p) 76 { 77 if (strcasecmp(p, "reset") == 0) 78 watchdog_action = WDT_RESET; 79 else if (strcasecmp(p, "shutdown") == 0) 80 watchdog_action = WDT_SHUTDOWN; 81 else if (strcasecmp(p, "poweroff") == 0) 82 watchdog_action = WDT_POWEROFF; 83 else if (strcasecmp(p, "pause") == 0) 84 watchdog_action = WDT_PAUSE; 85 else if (strcasecmp(p, "debug") == 0) 86 watchdog_action = WDT_DEBUG; 87 else if (strcasecmp(p, "none") == 0) 88 watchdog_action = WDT_NONE; 89 else 90 return -1; 91 92 return 0; 93 } 94 95 /* This actually performs the "action" once a watchdog has expired, 96 * ie. reboot, shutdown, exit, etc. 97 */ 98 void watchdog_perform_action(void) 99 { 100 switch(watchdog_action) { 101 case WDT_RESET: /* same as 'system_reset' in monitor */ 102 qemu_system_reset_request(); 103 break; 104 105 case WDT_SHUTDOWN: /* same as 'system_powerdown' in monitor */ 106 qemu_system_powerdown_request(); 107 break; 108 109 case WDT_POWEROFF: /* same as 'quit' command in monitor */ 110 exit(0); 111 break; 112 113 case WDT_PAUSE: /* same as 'stop' command in monitor */ 114 vm_stop(0); 115 break; 116 117 case WDT_DEBUG: 118 fprintf(stderr, "watchdog: timer fired\n"); 119 break; 120 121 case WDT_NONE: 122 break; 123 } 124 } 125 126 void watchdog_pc_init(PCIBus *pci_bus) 127 { 128 if (watchdog) 129 watchdog->wdt_pc_init(pci_bus); 130 } 131 132 void register_watchdogs(void) 133 { 134 #if 0 135 wdt_ib700_init(); 136 wdt_i6300esb_init(); 137 #endif 138 } 139