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. Neither the name of the University nor the names of its contributors
  23  *    may be used to endorse or promote products derived from this software
  24  *    without specific prior written permission.
  25  *
  26  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  27  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  28  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  29  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  30  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  31  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  32  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  33  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  34  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  35  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  36  * SUCH DAMAGE.
  37  *
  38  *      @(#)subr_autoconf.c     8.1 (Berkeley) 6/10/93
  39  *
  40  * $FreeBSD: src/sys/kern/subr_autoconf.c,v 1.14 1999/10/05 21:19:41 n_hibma Exp $
  41  * $DragonFly: src/sys/kern/subr_autoconf.c,v 1.9 2007/07/28 23:24:33 dillon Exp $
  42  */
  43
  44 #include <sys/param.h>
  45 #include <sys/kernel.h>
  46 #include <sys/systm.h>
  47 #include <sys/thread.h>
  48 #include <sys/thread2.h>
  49
  50 /*
  51  * Autoconfiguration subroutines.
  52  */
  53
  54 /*
  55  * "Interrupt driven config" functions.
  56  */
  57 static TAILQ_HEAD(, intr_config_hook) intr_config_hook_list =
  58         TAILQ_HEAD_INITIALIZER(intr_config_hook_list);
  59
  60
  61 /* ARGSUSED */
  62 static void run_interrupt_driven_config_hooks (void *dummy);
  63 static int ran_config_hooks;
  64
  65 static void
  66 run_interrupt_driven_config_hooks(void *dummy)
  67 {
  68         struct intr_config_hook *hook_entry;
  69         int waiting;
  70         int save_ticks;
  71
  72         waiting = 0;
  73         save_ticks = ticks;
  74
  75         ran_config_hooks = 1;
  76         while (!TAILQ_EMPTY(&intr_config_hook_list)) {
  77                 TAILQ_FOREACH(hook_entry, &intr_config_hook_list, ich_links) {
  78                         if (hook_entry->ich_ran == 0) {
  79                                 hook_entry->ich_ran = 1;
  80                                 (*hook_entry->ich_func)(hook_entry->ich_arg);
  81                                 break;
  82                         }
  83                 }
  84                 if (hook_entry)
  85                         continue;
  86                 if (TAILQ_EMPTY(&intr_config_hook_list))
  87                         break;
  88
  89                 if (waiting >= 20 && (waiting % 10) == 0) {
  90                         crit_enter();
  91                         kprintf("**WARNING** waiting for the following device "
  92                                 "to finish configuring:\n");
  93                         TAILQ_FOREACH(hook_entry, &intr_config_hook_list,
  94                                       ich_links) {
  95                             kprintf("  %s:\tfunc=%p arg=%p\n",
  96                                 (hook_entry->ich_desc ?
  97                                     hook_entry->ich_desc : "?"),
  98                                 hook_entry->ich_func,
  99                                 hook_entry->ich_arg);
 100                         }
 101                         crit_exit();
 102                         if (waiting >= 60) {
 103                                 kprintf("Giving up, interrupt routing is "
 104                                         "probably hosed\n");
 105                                 break;
 106                         }
 107                 }
 108                 tsleep(&intr_config_hook_list, 0, "conifhk", hz);
 109                 ++waiting;
 110         }
 111
 112         /*
 113          * Terrible hack to give U4B (usb) a chance to configure, else
 114          * the root mount might not see a valid usb device.  This can happen
 115          * because the AHCI devices might have already finished probing
 116          * before the usb ports are even registered.
 117          */
 118         while (ticks - save_ticks < 5*hz)
 119                 tsleep(&intr_config_hook_list, 0, "delay", hz / 10);
 120
 121 }
 122 SYSINIT(intr_config_hooks, SI_SUB_INT_CONFIG_HOOKS, SI_ORDER_FIRST,
 123         run_interrupt_driven_config_hooks, NULL)
 124
 125 /*
 126  * Register a hook that will be called after "cold"
 127  * autoconfiguration is complete and interrupts can
 128  * be used to complete initialization.
 129  */
 130 int
 131 config_intrhook_establish(struct intr_config_hook *hook)
 132 {
 133         struct intr_config_hook *hook_entry;
 134
 135         for (hook_entry = TAILQ_FIRST(&intr_config_hook_list);
 136              hook_entry != NULL;
 137              hook_entry = TAILQ_NEXT(hook_entry, ich_links)) {
 138                 if (hook_entry == hook)
 139                         break;
 140                 if (hook_entry->ich_order > hook->ich_order)
 141                         break;
 142         }
 143         if (hook_entry == hook) {
 144                 kprintf("config_intrhook_establish: establishing an "
 145                        "already established hook.\n");
 146                 return (1);
 147         }
 148         hook->ich_ran = 0;
 149         if (hook_entry)
 150                 TAILQ_INSERT_BEFORE(hook_entry, hook, ich_links);
 151         else
 152                 TAILQ_INSERT_TAIL(&intr_config_hook_list, hook, ich_links);
 153
 154         /*
 155          * Late hook, run immediately.
 156          */
 157         if (ran_config_hooks)
 158                 run_interrupt_driven_config_hooks(NULL);
 159         return (0);
 160 }
 161
 162 void
 163 config_intrhook_disestablish(struct intr_config_hook *hook)
 164 {
 165         struct intr_config_hook *hook_entry;
 166
 167         for (hook_entry = TAILQ_FIRST(&intr_config_hook_list);
 168              hook_entry != NULL;
 169              hook_entry = TAILQ_NEXT(hook_entry, ich_links))
 170                 if (hook_entry == hook)
 171                         break;
 172         if (hook_entry == NULL)
 173                 panic("config_intrhook_disestablish: disestablishing an "
 174                     "unestablished hook");
 175
 176         TAILQ_REMOVE(&intr_config_hook_list, hook, ich_links);
 177         /* Wakeup anyone watching the list */
 178         wakeup(&intr_config_hook_list);
 179 }