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
  68 static void
  69 run_interrupt_driven_config_hooks(void *dummy)
  70 {
  71         struct intr_config_hook *hook_entry, *next_entry;
  72         int waiting;
  73
  74         for (hook_entry = TAILQ_FIRST(&intr_config_hook_list);
  75              hook_entry != NULL;
  76              hook_entry = next_entry) {
  77                 next_entry = TAILQ_NEXT(hook_entry, ich_links);
  78                 (*hook_entry->ich_func)(hook_entry->ich_arg);
  79         }
  80
  81         waiting = 0;
  82         while (!TAILQ_EMPTY(&intr_config_hook_list)) {
  83                 if (waiting >= 20) {
  84                         crit_enter();
  85                         kprintf("**WARNING** waiting for the following device to finish configuring:\n");
  86                         TAILQ_FOREACH(hook_entry, &intr_config_hook_list, ich_links) {
  87                             kprintf("  %s:\tfunc=%p arg=%p\n",
  88                                 (hook_entry->ich_desc ?
  89                                     hook_entry->ich_desc : "?"),
  90                                 hook_entry->ich_func,
  91                                 hook_entry->ich_arg);
  92                         }
  93                         crit_exit();
  94                         if (waiting >= 60) {
  95                                 kprintf("Giving up, interrupt routing is probably hosed\n");
  96                                 break;
  97                         }
  98                 }
  99                 tsleep(&intr_config_hook_list, 0, "conifhk", hz * 10);
 100                 waiting += 10;
 101         }
 102 }
 103 SYSINIT(intr_config_hooks, SI_SUB_INT_CONFIG_HOOKS, SI_ORDER_FIRST,
 104         run_interrupt_driven_config_hooks, NULL)
 105
 106 /*
 107  * Register a hook that will be called after "cold"
 108  * autoconfiguration is complete and interrupts can
 109  * be used to complete initialization.
 110  */
 111 int
 112 config_intrhook_establish(struct intr_config_hook *hook)
 113 {
 114         struct intr_config_hook *hook_entry;
 115
 116         for (hook_entry = TAILQ_FIRST(&intr_config_hook_list);
 117              hook_entry != NULL;
 118              hook_entry = TAILQ_NEXT(hook_entry, ich_links)) {
 119                 if (hook_entry == hook)
 120                         break;
 121                 if (hook_entry->ich_order > hook->ich_order)
 122                         break;
 123         }
 124         if (hook_entry == hook) {
 125                 kprintf("config_intrhook_establish: establishing an "
 126                        "already established hook.\n");
 127                 return (1);
 128         }
 129         if (hook_entry)
 130                 TAILQ_INSERT_BEFORE(hook_entry, hook, ich_links);
 131         else
 132                 TAILQ_INSERT_TAIL(&intr_config_hook_list, hook, ich_links);
 133         if (cold == 0)
 134                 /* XXX Sufficient for modules loaded after initial config??? */
 135                 run_interrupt_driven_config_hooks(NULL);
 136         return (0);
 137 }
 138
 139 void
 140 config_intrhook_disestablish(struct intr_config_hook *hook)
 141 {
 142         struct intr_config_hook *hook_entry;
 143
 144         for (hook_entry = TAILQ_FIRST(&intr_config_hook_list);
 145              hook_entry != NULL;
 146              hook_entry = TAILQ_NEXT(hook_entry, ich_links))
 147                 if (hook_entry == hook)
 148                         break;
 149         if (hook_entry == NULL)
 150                 panic("config_intrhook_disestablish: disestablishing an "
 151                     "unestablished hook");
 152
 153         TAILQ_REMOVE(&intr_config_hook_list, hook, ich_links);
 154         /* Wakeup anyone watching the list */
 155         wakeup(&intr_config_hook_list);
 156 }