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 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 *
33 * @(#)subr_autoconf.c 8.1 (Berkeley) 6/10/93
34 *
35 */
36
37 #include <sys/cdefs.h>
38 __FBSDID("$FreeBSD: releng/8.0/sys/kern/subr_autoconf.c 188059 2009-02-03 07:52:07Z imp $");
39
40 #include "opt_ddb.h"
41
42 #include <sys/param.h>
43 #include <sys/kernel.h>
44 #include <sys/linker.h>
45 #include <sys/lock.h>
46 #include <sys/mutex.h>
47 #include <sys/systm.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 static struct mtx intr_config_hook_lock;
59 MTX_SYSINIT(intr_config_hook, &intr_config_hook_lock, "intr config", MTX_DEF);
60
61 /* ARGSUSED */
62 static void run_interrupt_driven_config_hooks(void *dummy);
63
64 /*
65 * If we wait too long for an interrupt-driven config hook to return, print
66 * a diagnostic.
67 */
68 #define WARNING_INTERVAL_SECS 60
69 static void
70 run_interrupt_driven_config_hooks_warning(int warned)
71 {
72 struct intr_config_hook *hook_entry;
73 char namebuf[64];
74 long offset;
75
76 if (warned < 6) {
77 printf("run_interrupt_driven_hooks: still waiting after %d "
78 "seconds for", warned * WARNING_INTERVAL_SECS);
79 TAILQ_FOREACH(hook_entry, &intr_config_hook_list, ich_links) {
80 if (linker_search_symbol_name(
81 (caddr_t)hook_entry->ich_func, namebuf,
82 sizeof(namebuf), &offset) == 0)
83 printf(" %s", namebuf);
84 else
85 printf(" %p", hook_entry->ich_func);
86 }
87 printf("\n");
88 }
89 KASSERT(warned < 6,
90 ("run_interrupt_driven_config_hooks: waited too long"));
91 }
92
93 static void
94 run_interrupt_driven_config_hooks(void *dummy)
95 {
96 struct intr_config_hook *hook_entry, *next_entry;
97 int warned;
98
99 mtx_lock(&intr_config_hook_lock);
100 TAILQ_FOREACH_SAFE(hook_entry, &intr_config_hook_list, ich_links,
101 next_entry) {
102 mtx_unlock(&intr_config_hook_lock);
103 (*hook_entry->ich_func)(hook_entry->ich_arg);
104 mtx_lock(&intr_config_hook_lock);
105 }
106
107 warned = 0;
108 while (!TAILQ_EMPTY(&intr_config_hook_list)) {
109 if (msleep(&intr_config_hook_list, &intr_config_hook_lock,
110 PCONFIG, "conifhk", WARNING_INTERVAL_SECS * hz) ==
111 EWOULDBLOCK) {
112 mtx_unlock(&intr_config_hook_lock);
113 warned++;
114 run_interrupt_driven_config_hooks_warning(warned);
115 mtx_lock(&intr_config_hook_lock);
116 }
117 }
118 mtx_unlock(&intr_config_hook_lock);
119 }
120 SYSINIT(intr_config_hooks, SI_SUB_INT_CONFIG_HOOKS, SI_ORDER_FIRST,
121 run_interrupt_driven_config_hooks, NULL);
122
123 /*
124 * Register a hook that will be called after "cold"
125 * autoconfiguration is complete and interrupts can
126 * be used to complete initialization.
127 */
128 int
129 config_intrhook_establish(struct intr_config_hook *hook)
130 {
131 struct intr_config_hook *hook_entry;
132
133 mtx_lock(&intr_config_hook_lock);
134 TAILQ_FOREACH(hook_entry, &intr_config_hook_list, ich_links)
135 if (hook_entry == hook)
136 break;
137 if (hook_entry != NULL) {
138 mtx_unlock(&intr_config_hook_lock);
139 printf("config_intrhook_establish: establishing an "
140 "already established hook.\n");
141 return (1);
142 }
143 TAILQ_INSERT_TAIL(&intr_config_hook_list, hook, ich_links);
144 mtx_unlock(&intr_config_hook_lock);
145 if (cold == 0)
146 /* XXX Sufficient for modules loaded after initial config??? */
147 run_interrupt_driven_config_hooks(NULL);
148 return (0);
149 }
150
151 void
152 config_intrhook_disestablish(struct intr_config_hook *hook)
153 {
154 struct intr_config_hook *hook_entry;
155
156 mtx_lock(&intr_config_hook_lock);
157 TAILQ_FOREACH(hook_entry, &intr_config_hook_list, ich_links)
158 if (hook_entry == hook)
159 break;
160 if (hook_entry == NULL)
161 panic("config_intrhook_disestablish: disestablishing an "
162 "unestablished hook");
163
164 TAILQ_REMOVE(&intr_config_hook_list, hook, ich_links);
165
166 /* Wakeup anyone watching the list */
167 wakeup(&intr_config_hook_list);
168 mtx_unlock(&intr_config_hook_lock);
169 }
170
171 #ifdef DDB
172 #include <ddb/ddb.h>
173
174 DB_SHOW_COMMAND(conifhk, db_show_conifhk)
175 {
176 struct intr_config_hook *hook_entry;
177 char namebuf[64];
178 long offset;
179
180 TAILQ_FOREACH(hook_entry, &intr_config_hook_list, ich_links) {
181 if (linker_ddb_search_symbol_name(
182 (caddr_t)hook_entry->ich_func, namebuf, sizeof(namebuf),
183 &offset) == 0) {
184 db_printf("hook: %p at %s+%#lx arg: %p\n",
185 hook_entry->ich_func, namebuf, offset,
186 hook_entry->ich_arg);
187 } else {
188 db_printf("hook: %p at ??+?? arg %p\n",
189 hook_entry->ich_func, hook_entry->ich_arg);
190 }
191 }
192 }
193 #endif /* DDB */
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