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, 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@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     wdt_ib700_init();
 135     wdt_i6300esb_init();
 136 }