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
  64 static void
  65 run_interrupt_driven_config_hooks(void *dummy)
  66 {
  67         struct intr_config_hook *hook_entry;
  68         int waiting;
  69 #ifndef _KERNEL_VIRTUAL
  70         int save_ticks = ticks;
  71 #endif
  72         waiting = 0;
  73
  74         ran_config_hooks = 1;
  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                                 (*hook_entry->ich_func)(hook_entry->ich_arg);
  80                                 break;
  81                         }
  82                 }
  83                 if (hook_entry)
  84                         continue;
  85                 if (TAILQ_EMPTY(&intr_config_hook_list))
  86                         break;
  87
  88                 if (waiting >= 20 && (waiting % 10) == 0) {
  89                         crit_enter();
  90                         kprintf("**WARNING** waiting for the following device "
  91                                 "to finish configuring:\n");
  92                         TAILQ_FOREACH(hook_entry, &intr_config_hook_list,
  93                                       ich_links) {
  94                             kprintf("  %s:\tfunc=%p arg=%p\n",
  95                                 (hook_entry->ich_desc ?
  96                                     hook_entry->ich_desc : "?"),
  97                                 hook_entry->ich_func,
  98                                 hook_entry->ich_arg);
  99                         }
 100                         crit_exit();
 101                         if (waiting >= 60) {
 102                                 kprintf("Giving up, interrupt routing is "
 103                                         "probably hosed\n");
 104                                 break;
 105                         }
 106                 }
 107                 tsleep(&intr_config_hook_list, 0, "conifhk", hz);
 108                 ++waiting;
 109         }
 110
 111         /*
 112          * Terrible hack to give U4B (usb) a chance to configure, else
 113          * the root mount might not see a valid usb device.  This can happen
 114          * because the AHCI devices might have already finished probing
 115          * before the usb ports are even registered.
 116          */
 117 #ifndef _KERNEL_VIRTUAL
 118         while (ticks - save_ticks < 5*hz)
 119                 tsleep(&intr_config_hook_list, 0, "delay", hz / 10);
 120 #endif
 121
 122 }
 123 SYSINIT(intr_config_hooks, SI_SUB_INT_CONFIG_HOOKS, SI_ORDER_FIRST,
 124         run_interrupt_driven_config_hooks, NULL);
 125
 126 /*
 127  * Register a hook that will be called after "cold"
 128  * autoconfiguration is complete and interrupts can
 129  * be used to complete initialization.
 130  */
 131 int
 132 config_intrhook_establish(struct intr_config_hook *hook)
 133 {
 134         struct intr_config_hook *hook_entry;
 135
 136         for (hook_entry = TAILQ_FIRST(&intr_config_hook_list);
 137              hook_entry != NULL;
 138              hook_entry = TAILQ_NEXT(hook_entry, ich_links)) {
 139                 if (hook_entry == hook)
 140                         break;
 141                 if (hook_entry->ich_order > hook->ich_order)
 142                         break;
 143         }
 144         if (hook_entry == hook) {
 145                 kprintf("config_intrhook_establish: establishing an "
 146                        "already established hook.\n");
 147                 return (1);
 148         }
 149         hook->ich_ran = 0;
 150         if (hook_entry)
 151                 TAILQ_INSERT_BEFORE(hook_entry, hook, ich_links);
 152         else
 153                 TAILQ_INSERT_TAIL(&intr_config_hook_list, hook, ich_links);
 154
 155         /*
 156          * Late hook, run immediately.
 157          */
 158         if (ran_config_hooks)
 159                 run_interrupt_driven_config_hooks(NULL);
 160         return (0);
 161 }
 162
 163 void
 164 config_intrhook_disestablish(struct intr_config_hook *hook)
 165 {
 166         struct intr_config_hook *hook_entry;
 167
 168         for (hook_entry = TAILQ_FIRST(&intr_config_hook_list);
 169              hook_entry != NULL;
 170              hook_entry = TAILQ_NEXT(hook_entry, ich_links))
 171                 if (hook_entry == hook)
 172                         break;
 173         if (hook_entry == NULL)
 174                 panic("config_intrhook_disestablish: disestablishing an "
 175                     "unestablished hook");
 176
 177         TAILQ_REMOVE(&intr_config_hook_list, hook, ich_links);
 178         /* Wakeup anyone watching the list */
 179         wakeup(&intr_config_hook_list);
 180 }