hw/watchdog.c

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