linux_module.c revision 1.3 
1/*	$NetBSD: linux_module.c,v 1.3 2014/07/16 20:56:25 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 1.3 2014/07/16 20:56:25 riastradh Exp $");
34
35#include <sys/module.h>
36#ifndef _MODULE
37#include <sys/once.h>
38#endif
39
40#include <linux/highmem.h>
41#include <linux/idr.h>
42#include <linux/io.h>
43#include <linux/mutex.h>
44#include <linux/workqueue.h>
45
46MODULE(MODULE_CLASS_MISC, drmkms_linux, NULL);
47
48static int
49linux_init(void)
50{
51	int error;
52
53	error = linux_idr_module_init();
54	if (error) {
55		printf("linux: unable to initialize idr: %d\n", error);
56		goto fail0;
57	}
58
59	error = linux_kmap_init();
60	if (error) {
61		printf("linux: unable to initialize kmap: %d\n", error);
62		goto fail1;
63	}
64
65	error = linux_workqueue_init();
66	if (error) {
67		printf("linux: unable to initialize workqueues: %d\n", error);
68		goto fail2;
69	}
70
71	error = linux_writecomb_init();
72	if (error) {
73		printf("linux: unable to initialize write-combining: %d\n",
74		    error);
75		goto fail3;
76	}
77
78	return 0;
79
80fail4: __unused
81	linux_writecomb_fini();
82fail3:	linux_workqueue_fini();
83fail2:	linux_kmap_fini();
84fail1:	linux_idr_module_fini();
85fail0:	return error;
86}
87
88int	linux_guarantee_initialized(void); /* XXX */
89int
90linux_guarantee_initialized(void)
91{
92#ifdef _MODULE
93	return 0;
94#else
95	static ONCE_DECL(linux_init_once);
96
97	return RUN_ONCE(&linux_init_once, &linux_init);
98#endif
99}
100
101static void
102linux_fini(void)
103{
104
105	linux_writecomb_fini();
106	linux_workqueue_fini();
107	linux_kmap_fini();
108}
109
110static int
111drmkms_linux_modcmd(modcmd_t cmd, void *arg __unused)
112{
113
114	switch (cmd) {
115	case MODULE_CMD_INIT:
116#ifdef _MODULE
117		return linux_init();
118#else
119		return linux_guarantee_initialized();
120#endif
121	case MODULE_CMD_FINI:
122		linux_fini();
123		return 0;
124	default:
125		return ENOTTY;
126	}
127}
128