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  */
  42
  43 #include <sys/param.h>
  44 #include <sys/kernel.h>
  45 #include <sys/systm.h>
  46 #include <sys/thread.h>
  47 #include <sys/thread2.h>
  48
  49 /*
  50  * Autoconfiguration subroutines.
  51  */
  52
  53 /*
  54  * "Interrupt driven config" functions.
  55  */
  56 static TAILQ_HEAD(, intr_config_hook) intr_config_hook_list =
  57         TAILQ_HEAD_INITIALIZER(intr_config_hook_list);
  58
  59
  60 /* ARGSUSED */
  61 static void run_interrupt_driven_config_hooks (void *dummy);
  62 static int ran_config_hooks;
  63 static struct lock intr_config_lk = LOCK_INITIALIZER("intrcfg", 0, 0);
  64
  65 static void
  66 run_interrupt_driven_config_hooks(void *dummy)
  67 {
  68         struct intr_config_hook *hook_entry;
  69         int save_ticks = ticks;
  70         int save_count;
  71         int waiting;
  72
  73         lockmgr(&intr_config_lk, LK_EXCLUSIVE);
  74         save_count = ran_config_hooks++;
  75         while (!TAILQ_EMPTY(&intr_config_hook_list)) {
  76                 TAILQ_FOREACH(hook_entry, &intr_config_hook_list, ich_links) {
  77                         if (hook_entry->ich_ran == 0) {
  78                                 hook_entry->ich_ran = 1;
  79                                 lockmgr(&intr_config_lk, LK_RELEASE);
  80                                 (*hook_entry->ich_func)(hook_entry->ich_arg);
  81                                 lockmgr(&intr_config_lk, LK_EXCLUSIVE);
  82                                 break;
  83                         }
  84                 }
  85                 if (hook_entry)
  86                         continue;
  87                 if (TAILQ_EMPTY(&intr_config_hook_list))
  88                         break;
  89
  90                 waiting = (ticks - save_ticks + 1) / hz;
  91
  92                 if (waiting >= 10 && (waiting % 10) == 0) {
  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                         if (save_count || waiting >= 30) {
 104                                 kprintf("Giving up, interrupt routing is "
 105                                         "probably hosed\n");
 106                                 break;
 107                         }
 108                 }
 109                 lksleep(&intr_config_hook_list, &intr_config_lk,
 110                         0, "conifhk", hz);
 111                 ++waiting;
 112         }
 113         lockmgr(&intr_config_lk, LK_RELEASE);
 114
 115         /*
 116          * Terrible hack to give U4B (usb) a chance to configure, else
 117          * the root mount might not see a valid usb device.  This can happen
 118          * because the AHCI devices might have already finished probing
 119          * before the usb ports are even registered.
 120          */
 121 #ifndef _KERNEL_VIRTUAL
 122         if (save_count == 0) {
 123                 while (ticks - save_ticks < 5*hz)
 124                         tsleep(&intr_config_hook_list, 0, "delay", hz / 10);
 125         }
 126 #endif
 127
 128 }
 129 SYSINIT(intr_config_hooks, SI_SUB_INT_CONFIG_HOOKS, SI_ORDER_FIRST,
 130         run_interrupt_driven_config_hooks, NULL);
 131
 132 /*
 133  * Register a hook that will be called after "cold"
 134  * autoconfiguration is complete and interrupts can
 135  * be used to complete initialization.
 136  */
 137 int
 138 config_intrhook_establish(struct intr_config_hook *hook)
 139 {
 140         struct intr_config_hook *hook_entry;
 141
 142         lockmgr(&intr_config_lk, LK_EXCLUSIVE);
 143         for (hook_entry = TAILQ_FIRST(&intr_config_hook_list);
 144              hook_entry != NULL;
 145              hook_entry = TAILQ_NEXT(hook_entry, ich_links)) {
 146                 if (hook_entry == hook)
 147                         break;
 148                 if (hook_entry->ich_order > hook->ich_order)
 149                         break;
 150         }
 151         if (hook_entry == hook) {
 152                 kprintf("config_intrhook_establish: establishing an "
 153                        "already established hook.\n");
 154                 lockmgr(&intr_config_lk, LK_RELEASE);
 155                 return (1);
 156         }
 157         hook->ich_ran = 0;
 158
 159         /*
 160          * Insert
 161          */
 162         if (hook_entry)
 163                 TAILQ_INSERT_BEFORE(hook_entry, hook, ich_links);
 164         else
 165                 TAILQ_INSERT_TAIL(&intr_config_hook_list, hook, ich_links);
 166
 167         /*
 168          * Late hook, run immediately.
 169          */
 170         if (ran_config_hooks) {
 171                 lockmgr(&intr_config_lk, LK_RELEASE);
 172                 run_interrupt_driven_config_hooks(NULL);
 173                 lockmgr(&intr_config_lk, LK_EXCLUSIVE);
 174         }
 175         lockmgr(&intr_config_lk, LK_RELEASE);
 176
 177         return (0);
 178 }
 179
 180 void
 181 config_intrhook_disestablish(struct intr_config_hook *hook)
 182 {
 183         struct intr_config_hook *hook_entry;
 184
 185         lockmgr(&intr_config_lk, LK_EXCLUSIVE);
 186         for (hook_entry = TAILQ_FIRST(&intr_config_hook_list);
 187              hook_entry != NULL;
 188              hook_entry = TAILQ_NEXT(hook_entry, ich_links)) {
 189                 if (hook_entry == hook)
 190                         break;
 191         }
 192         if (hook_entry == NULL) {
 193                 lockmgr(&intr_config_lk, LK_RELEASE);
 194                 panic("config_intrhook_disestablish: disestablishing an "
 195                       "unestablished hook (%p)", hook);
 196         }
 197
 198         TAILQ_REMOVE(&intr_config_hook_list, hook, ich_links);
 199         /* Wakeup anyone watching the list */
 200         wakeup(&intr_config_hook_list);
 201         lockmgr(&intr_config_lk, LK_RELEASE);
 202 }