sys/kern/subr_autoconf.c

   1 /*
   2  * Copyright (c) 1992, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * This software was developed by the Computer Systems Engineering group
   6  * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
   7  * contributed to Berkeley.
   8  *
   9  * All advertising materials mentioning features or use of this software
  10  * must display the following acknowledgement:
  11  *      This product includes software developed by the University of
  12  *      California, Lawrence Berkeley Laboratories.
  13  *
  14  * Redistribution and use in source and binary forms, with or without
  15  * modification, are permitted provided that the following conditions
  16  * are met:
  17  * 1. Redistributions of source code must retain the above copyright
  18  *    notice, this list of conditions and the following disclaimer.
  19  * 2. Redistributions in binary form must reproduce the above copyright
  20  *    notice, this list of conditions and the following disclaimer in the
  21  *    documentation and/or other materials provided with the distribution.
  22  * 3. All advertising materials mentioning features or use of this software
  23  *    must display the following acknowledgement:
  24  *      This product includes software developed by the University of
  25  *      California, Berkeley and its contributors.
  26  * 4. Neither the name of the University nor the names of its contributors
  27  *    may be used to endorse or promote products derived from this software
  28  *    without specific prior written permission.
  29  *
  30  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  31  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  32  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  33  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  34  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  35  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  36  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  37  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  38  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  39  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  40  * SUCH DAMAGE.
  41  *
  42  *      @(#)subr_autoconf.c     8.1 (Berkeley) 6/10/93
  43  *
  44  * $FreeBSD: src/sys/kern/subr_autoconf.c,v 1.14 1999/10/05 21:19:41 n_hibma Exp $
  45  * $DragonFly: src/sys/kern/subr_autoconf.c,v 1.9 2007/07/28 23:24:33 dillon Exp $
  46  */
  47
  48 #include <sys/param.h>
  49 #include <sys/kernel.h>
  50 #include <sys/systm.h>
  51 #include <sys/thread.h>
  52 #include <sys/thread2.h>
  53
  54 /*
  55  * Autoconfiguration subroutines.
  56  */
  57
  58 /*
  59  * "Interrupt driven config" functions.
  60  */
  61 static TAILQ_HEAD(, intr_config_hook) intr_config_hook_list =
  62         TAILQ_HEAD_INITIALIZER(intr_config_hook_list);
  63
  64
  65 /* ARGSUSED */
  66 static void run_interrupt_driven_config_hooks (void *dummy);
  67 static int ran_config_hooks;
  68
  69 static void
  70 run_interrupt_driven_config_hooks(void *dummy)
  71 {
  72         struct intr_config_hook *hook_entry;
  73         int waiting;
  74
  75         waiting = 0;
  76
  77         ran_config_hooks = 1;
  78         while (!TAILQ_EMPTY(&intr_config_hook_list)) {
  79                 TAILQ_FOREACH(hook_entry, &intr_config_hook_list, ich_links) {
  80                         if (hook_entry->ich_ran == 0) {
  81                                 hook_entry->ich_ran = 1;
  82                                 (*hook_entry->ich_func)(hook_entry->ich_arg);
  83                                 break;
  84                         }
  85                 }
  86                 if (hook_entry)
  87                         continue;
  88                 if (TAILQ_EMPTY(&intr_config_hook_list))
  89                         break;
  90
  91                 if (waiting >= 20 && (waiting % 10) == 0) {
  92                         crit_enter();
  93                         kprintf("**WARNING** waiting for the following device "
  94                                 "to finish configuring:\n");
  95                         TAILQ_FOREACH(hook_entry, &intr_config_hook_list,
  96                                       ich_links) {
  97                             kprintf("  %s:\tfunc=%p arg=%p\n",
  98                                 (hook_entry->ich_desc ?
  99                                     hook_entry->ich_desc : "?"),
 100                                 hook_entry->ich_func,
 101                                 hook_entry->ich_arg);
 102                         }
 103                         crit_exit();
 104                         if (waiting >= 60) {
 105                                 kprintf("Giving up, interrupt routing is "
 106                                         "probably hosed\n");
 107                                 break;
 108                         }
 109                 }
 110                 tsleep(&intr_config_hook_list, 0, "conifhk", hz);
 111                 ++waiting;
 112         }
 113 }
 114 SYSINIT(intr_config_hooks, SI_SUB_INT_CONFIG_HOOKS, SI_ORDER_FIRST,
 115         run_interrupt_driven_config_hooks, NULL)
 116
 117 /*
 118  * Register a hook that will be called after "cold"
 119  * autoconfiguration is complete and interrupts can
 120  * be used to complete initialization.
 121  */
 122 int
 123 config_intrhook_establish(struct intr_config_hook *hook)
 124 {
 125         struct intr_config_hook *hook_entry;
 126
 127         for (hook_entry = TAILQ_FIRST(&intr_config_hook_list);
 128              hook_entry != NULL;
 129              hook_entry = TAILQ_NEXT(hook_entry, ich_links)) {
 130                 if (hook_entry == hook)
 131                         break;
 132                 if (hook_entry->ich_order > hook->ich_order)
 133                         break;
 134         }
 135         if (hook_entry == hook) {
 136                 kprintf("config_intrhook_establish: establishing an "
 137                        "already established hook.\n");
 138                 return (1);
 139         }
 140         hook->ich_ran = 0;
 141         if (hook_entry)
 142                 TAILQ_INSERT_BEFORE(hook_entry, hook, ich_links);
 143         else
 144                 TAILQ_INSERT_TAIL(&intr_config_hook_list, hook, ich_links);
 145
 146         /*
 147          * Late hook, run immediately.
 148          */
 149         if (ran_config_hooks)
 150                 run_interrupt_driven_config_hooks(NULL);
 151         return (0);
 152 }
 153
 154 void
 155 config_intrhook_disestablish(struct intr_config_hook *hook)
 156 {
 157         struct intr_config_hook *hook_entry;
 158
 159         for (hook_entry = TAILQ_FIRST(&intr_config_hook_list);
 160              hook_entry != NULL;
 161              hook_entry = TAILQ_NEXT(hook_entry, ich_links))
 162                 if (hook_entry == hook)
 163                         break;
 164         if (hook_entry == NULL)
 165                 panic("config_intrhook_disestablish: disestablishing an "
 166                     "unestablished hook");
 167
 168         TAILQ_REMOVE(&intr_config_hook_list, hook, ich_links);
 169         /* Wakeup anyone watching the list */
 170         wakeup(&intr_config_hook_list);
 171 }