linux_module.c revision 1.10 
1/*	$NetBSD: linux_module.c,v 1.10 2021/12/19 01:17:14 riastradh Exp $	*/
2
3/*-
4 * Copyright (c) 2014 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Taylor R. Campbell.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32#include <sys/cdefs.h>
33__KERNEL_RCSID(0, "$NetBSD: linux_module.c,v 1.10 2021/12/19 01:17:14 riastradh Exp $");
34
35#include <sys/module.h>
36#ifndef _MODULE
37#include <sys/once.h>
38#endif
39
40#include <linux/atomic.h>
41#include <linux/highmem.h>
42#include <linux/idr.h>
43#include <linux/io.h>
44#include <linux/mutex.h>
45#include <linux/rcupdate.h>
46#include <linux/tasklet.h>
47#include <linux/workqueue.h>
48
49MODULE(MODULE_CLASS_MISC, drmkms_linux, "i2cexec");
50
51static int
52linux_init(void)
53{
54	int error;
55
56	error = linux_idr_module_init();
57	if (error) {
58		printf("linux: unable to initialize idr: %d\n", error);
59		goto fail0;
60	}
61
62	error = linux_kmap_init();
63	if (error) {
64		printf("linux: unable to initialize kmap: %d\n", error);
65		goto fail1;
66	}
67
68	error = linux_rcu_gc_init();
69	if (error) {
70		printf("linux: unable to initialize rcu gc: %d\n", error);
71		goto fail2;
72	}
73
74	error = linux_workqueue_init();
75	if (error) {
76		printf("linux: unable to initialize workqueues: %d\n", error);
77		goto fail3;
78	}
79
80	error = linux_writecomb_init();
81	if (error) {
82		printf("linux: unable to initialize write-combining: %d\n",
83		    error);
84		goto fail4;
85	}
86
87	error = linux_atomic64_init();
88	if (error) {
89		printf("linux: unable to initialize atomic64: %d\n", error);
90		goto fail5;
91	}
92
93	error = linux_tasklets_init();
94	if (error) {
95		printf("linux: unable to initialize tasklets: %d\n", error);
96		goto fail6;
97	}
98
99	return 0;
100
101fail7: __unused
102	linux_tasklets_fini();
103fail6:	linux_atomic64_fini();
104fail5:	linux_writecomb_fini();
105fail4:	linux_workqueue_fini();
106fail3:	linux_rcu_gc_fini();
107fail2:	linux_kmap_fini();
108fail1:	linux_idr_module_fini();
109fail0:	return error;
110}
111
112int	linux_guarantee_initialized(void); /* XXX */
113int
114linux_guarantee_initialized(void)
115{
116#ifdef _MODULE
117	return 0;
118#else
119	static ONCE_DECL(linux_init_once);
120
121	return RUN_ONCE(&linux_init_once, &linux_init);
122#endif
123}
124
125static void
126linux_fini(void)
127{
128
129	linux_tasklets_fini();
130	linux_atomic64_fini();
131	linux_writecomb_fini();
132	linux_workqueue_fini();
133	linux_rcu_gc_fini();
134	linux_kmap_fini();
135	linux_idr_module_fini();
136}
137
138static int
139drmkms_linux_modcmd(modcmd_t cmd, void *arg __unused)
140{
141
142	switch (cmd) {
143	case MODULE_CMD_INIT:
144#ifdef _MODULE
145		return linux_init();
146#else
147		return linux_guarantee_initialized();
148#endif
149	case MODULE_CMD_FINI:
150		linux_fini();
151		return 0;
152	default:
153		return ENOTTY;
154	}
155}
156