Annotation of qemu/hw/watchdog.c, revision 1.1.1.3

1.1       root        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"
1.1.1.2   root       23: #include "qemu-option.h"
                     24: #include "qemu-config.h"
                     25: #include "qemu-queue.h"
1.1.1.3 ! root       26: #include "qemu-objects.h"
        !            27: #include "monitor.h"
1.1       root       28: #include "sysemu.h"
                     29: #include "hw/watchdog.h"
                     30: 
1.1.1.2   root       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;
1.1       root       41: 
                     42: void watchdog_add_model(WatchdogTimerModel *model)
                     43: {
1.1.1.2   root       44:     QLIST_INSERT_HEAD(&watchdog_list, model, entry);
1.1       root       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;
1.1.1.2   root       55:     QemuOpts *opts;
1.1       root       56: 
                     57:     /* -watchdog ? lists available devices and exits cleanly. */
                     58:     if (strcmp(p, "?") == 0) {
1.1.1.2   root       59:         QLIST_FOREACH(model, &watchdog_list, entry) {
1.1       root       60:             fprintf(stderr, "\t%s\t%s\n",
                     61:                      model->wdt_name, model->wdt_description);
                     62:         }
                     63:         return 2;
                     64:     }
                     65: 
1.1.1.2   root       66:     QLIST_FOREACH(model, &watchdog_list, entry) {
1.1       root       67:         if (strcasecmp(model->wdt_name, p) == 0) {
1.1.1.2   root       68:             /* add the device */
                     69:             opts = qemu_opts_create(&qemu_device_opts, NULL, 0);
                     70:             qemu_opt_set(opts, "driver", p);
1.1       root       71:             return 0;
                     72:         }
                     73:     }
                     74: 
                     75:     fprintf(stderr, "Unknown -watchdog device. Supported devices are:\n");
1.1.1.2   root       76:     QLIST_FOREACH(model, &watchdog_list, entry) {
1.1       root       77:         fprintf(stderr, "\t%s\t%s\n",
                     78:                  model->wdt_name, model->wdt_description);
                     79:     }
                     80:     return 1;
                     81: }
                     82: 
                     83: int select_watchdog_action(const char *p)
                     84: {
                     85:     if (strcasecmp(p, "reset") == 0)
                     86:         watchdog_action = WDT_RESET;
                     87:     else if (strcasecmp(p, "shutdown") == 0)
                     88:         watchdog_action = WDT_SHUTDOWN;
                     89:     else if (strcasecmp(p, "poweroff") == 0)
                     90:         watchdog_action = WDT_POWEROFF;
                     91:     else if (strcasecmp(p, "pause") == 0)
                     92:         watchdog_action = WDT_PAUSE;
                     93:     else if (strcasecmp(p, "debug") == 0)
                     94:         watchdog_action = WDT_DEBUG;
                     95:     else if (strcasecmp(p, "none") == 0)
                     96:         watchdog_action = WDT_NONE;
                     97:     else
                     98:         return -1;
                     99: 
                    100:     return 0;
                    101: }
                    102: 
1.1.1.3 ! root      103: static void watchdog_mon_event(const char *action)
        !           104: {
        !           105:     QObject *data;
        !           106: 
        !           107:     data = qobject_from_jsonf("{ 'action': %s }", action);
        !           108:     monitor_protocol_event(QEVENT_WATCHDOG, data);
        !           109:     qobject_decref(data);
        !           110: }
        !           111: 
1.1       root      112: /* This actually performs the "action" once a watchdog has expired,
                    113:  * ie. reboot, shutdown, exit, etc.
                    114:  */
                    115: void watchdog_perform_action(void)
                    116: {
                    117:     switch(watchdog_action) {
                    118:     case WDT_RESET:             /* same as 'system_reset' in monitor */
1.1.1.3 ! root      119:         watchdog_mon_event("reset");
1.1       root      120:         qemu_system_reset_request();
                    121:         break;
                    122: 
                    123:     case WDT_SHUTDOWN:          /* same as 'system_powerdown' in monitor */
1.1.1.3 ! root      124:         watchdog_mon_event("shutdown");
1.1       root      125:         qemu_system_powerdown_request();
                    126:         break;
                    127: 
                    128:     case WDT_POWEROFF:          /* same as 'quit' command in monitor */
1.1.1.3 ! root      129:         watchdog_mon_event("poweroff");
1.1       root      130:         exit(0);
                    131:         break;
                    132: 
                    133:     case WDT_PAUSE:             /* same as 'stop' command in monitor */
1.1.1.3 ! root      134:         watchdog_mon_event("pause");
1.1       root      135:         vm_stop(0);
                    136:         break;
                    137: 
                    138:     case WDT_DEBUG:
1.1.1.3 ! root      139:         watchdog_mon_event("debug");
1.1       root      140:         fprintf(stderr, "watchdog: timer fired\n");
                    141:         break;
                    142: 
                    143:     case WDT_NONE:
1.1.1.3 ! root      144:         watchdog_mon_event("none");
1.1       root      145:         break;
                    146:     }
                    147: }

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