watchdog.c

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    1 /*-
    2  * Copyright (c) 2004 Poul-Henning Kamp
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer
   10  *    in this position and unchanged.
   11  * 2. Redistributions in binary form must reproduce the above copyright
   12  *    notice, this list of conditions and the following disclaimer in the
   13  *    documentation and/or other materials provided with the distribution.
   14  *
   15  * THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR
   16  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   18  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   19  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   20  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   21  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   22  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   24  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   25  *
   26  */
   27 
   28 #include <sys/cdefs.h>
   29 __FBSDID("$FreeBSD: releng/8.4/sys/dev/watchdog/watchdog.c 221939 2011-05-15 01:08:51Z attilio $");
   30 
   31 #include <sys/param.h>
   32 #include <sys/systm.h>
   33 #include <sys/conf.h>
   34 #include <sys/uio.h>
   35 #include <sys/kernel.h>
   36 #include <sys/malloc.h>
   37 #include <sys/module.h>
   38 #include <sys/watchdog.h>
   39 #include <sys/bus.h>
   40 #include <machine/bus.h>
   41 
   42 static struct cdev *wd_dev;
   43 static volatile u_int wd_last_u;
   44 
   45 static int
   46 kern_do_pat(u_int utim)
   47 {
   48         int error;
   49 
   50         if ((utim & WD_LASTVAL) != 0 && (utim & WD_INTERVAL) > 0)
   51                 return (EINVAL);
   52 
   53         if ((utim & WD_LASTVAL) != 0) {
   54                 MPASS((wd_last_u & ~WD_INTERVAL) == 0);
   55                 utim &= ~WD_LASTVAL;
   56                 utim |= wd_last_u;
   57         } else
   58                 wd_last_u = (utim & WD_INTERVAL);
   59         if ((utim & WD_INTERVAL) == WD_TO_NEVER) {
   60                 utim = 0;
   61 
   62                 /* Assume all is well; watchdog signals failure. */
   63                 error = 0;
   64         } else {
   65                 /* Assume no watchdog available; watchdog flags success */
   66                 error = EOPNOTSUPP;
   67         }
   68         EVENTHANDLER_INVOKE(watchdog_list, utim, &error);
   69         return (error);
   70 }
   71 
   72 static int
   73 wd_ioctl(struct cdev *dev __unused, u_long cmd, caddr_t data,
   74     int flags __unused, struct thread *td)
   75 {
   76         u_int u;
   77 
   78         if (cmd != WDIOCPATPAT)
   79                 return (ENOIOCTL);
   80         u = *(u_int *)data;
   81         if (u & ~(WD_ACTIVE | WD_PASSIVE | WD_LASTVAL | WD_INTERVAL))
   82                 return (EINVAL);
   83         if ((u & (WD_ACTIVE | WD_PASSIVE)) == (WD_ACTIVE | WD_PASSIVE))
   84                 return (EINVAL);
   85         if ((u & (WD_ACTIVE | WD_PASSIVE)) == 0 && ((u & WD_INTERVAL) > 0 ||
   86             (u & WD_LASTVAL) != 0))
   87                 return (EINVAL);
   88         if (u & WD_PASSIVE)
   89                 return (ENOSYS);        /* XXX Not implemented yet */
   90         u &= ~(WD_ACTIVE | WD_PASSIVE);
   91 
   92         return (kern_do_pat(u));
   93 }
   94 
   95 u_int
   96 wdog_kern_last_timeout(void)
   97 {
   98 
   99         return (wd_last_u);
  100 }
  101 
  102 int
  103 wdog_kern_pat(u_int utim)
  104 {
  105 
  106         if (utim & ~(WD_LASTVAL | WD_INTERVAL))
  107                 return (EINVAL);
  108 
  109         return (kern_do_pat(utim));
  110 }
  111 
  112 static struct cdevsw wd_cdevsw = {
  113         .d_version =    D_VERSION,
  114         .d_ioctl =      wd_ioctl,
  115         .d_name =       "watchdog",
  116 };
  117 
  118 static int
  119 watchdog_modevent(module_t mod __unused, int type, void *data __unused)
  120 {
  121         switch(type) {
  122         case MOD_LOAD:
  123                 wd_dev = make_dev(&wd_cdevsw, 0,
  124                     UID_ROOT, GID_WHEEL, 0600, _PATH_WATCHDOG);
  125                 return 0;
  126         case MOD_UNLOAD:
  127                 destroy_dev(wd_dev);
  128                 return 0;
  129         case MOD_SHUTDOWN:
  130                 return 0;
  131         default:
  132                 return EOPNOTSUPP;
  133         }
  134 }
  135 
  136 DEV_MODULE(watchdog, watchdog_modevent, NULL);

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FreeBSD/Linux Kernel Cross Reference sys/dev/watchdog/watchdog.c

FreeBSD/Linux Kernel Cross Reference
sys/dev/watchdog/watchdog.c