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      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