kernel - close holes in autoconf's run_interrupt_driven_config_hooks()
[dragonfly.git] / sys / kern / subr_autoconf.c
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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 $
cce90053 45 * $DragonFly: src/sys/kern/subr_autoconf.c,v 1.9 2007/07/28 23:24:33 dillon Exp $
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46 */
47
48#include <sys/param.h>
49#include <sys/kernel.h>
50#include <sys/systm.h>
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51#include <sys/thread.h>
52#include <sys/thread2.h>
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53
54/*
55 * Autoconfiguration subroutines.
56 */
57
58/*
59 * "Interrupt driven config" functions.
60 */
61static TAILQ_HEAD(, intr_config_hook) intr_config_hook_list =
62 TAILQ_HEAD_INITIALIZER(intr_config_hook_list);
63
64
65/* ARGSUSED */
402ed7e1 66static void run_interrupt_driven_config_hooks (void *dummy);
d849b922 67static int ran_config_hooks;
fbda7fa6 68
984263bc 69static void
fbda7fa6 70run_interrupt_driven_config_hooks(void *dummy)
984263bc 71{
d849b922 72 struct intr_config_hook *hook_entry;
a1e26a0c 73 int waiting;
984263bc 74
a1e26a0c 75 waiting = 0;
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76
77 ran_config_hooks = 1;
984263bc 78 while (!TAILQ_EMPTY(&intr_config_hook_list)) {
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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) {
a1e26a0c 92 crit_enter();
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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) {
6ea70f76 97 kprintf(" %s:\tfunc=%p arg=%p\n",
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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) {
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105 kprintf("Giving up, interrupt routing is "
106 "probably hosed\n");
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107 break;
108 }
109 }
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110 tsleep(&intr_config_hook_list, 0, "conifhk", hz);
111 ++waiting;
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112 }
113}
114SYSINIT(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 */
122int
fbda7fa6 123config_intrhook_establish(struct intr_config_hook *hook)
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124{
125 struct intr_config_hook *hook_entry;
126
127 for (hook_entry = TAILQ_FIRST(&intr_config_hook_list);
128 hook_entry != NULL;
cce90053 129 hook_entry = TAILQ_NEXT(hook_entry, ich_links)) {
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130 if (hook_entry == hook)
131 break;
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132 if (hook_entry->ich_order > hook->ich_order)
133 break;
134 }
135 if (hook_entry == hook) {
6ea70f76 136 kprintf("config_intrhook_establish: establishing an "
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137 "already established hook.\n");
138 return (1);
139 }
d849b922 140 hook->ich_ran = 0;
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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);
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145
146 /*
147 * Late hook, run immediately.
148 */
149 if (ran_config_hooks)
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150 run_interrupt_driven_config_hooks(NULL);
151 return (0);
152}
153
154void
fbda7fa6 155config_intrhook_disestablish(struct intr_config_hook *hook)
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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 "
fbda7fa6 166 "unestablished hook");
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167
168 TAILQ_REMOVE(&intr_config_hook_list, hook, ich_links);
169 /* Wakeup anyone watching the list */
170 wakeup(&intr_config_hook_list);
171}