linux_module.c revision 1.5 
1/*	$NetBSD: linux_module.c,v 1.5 2014/11/11 02:37:17 christos 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 1.5 2014/11/11 02:37:17 christos 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/reservation.h>
45#include <linux/workqueue.h>
46
47MODULE(MODULE_CLASS_MISC, drmkms_linux, NULL);
48
49DEFINE_WW_CLASS(reservation_ww_class __cacheline_aligned);
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_workqueue_init();
69	if (error) {
70		printf("linux: unable to initialize workqueues: %d\n", error);
71		goto fail2;
72	}
73
74	error = linux_writecomb_init();
75	if (error) {
76		printf("linux: unable to initialize write-combining: %d\n",
77		    error);
78		goto fail3;
79	}
80
81	return 0;
82
83fail4: __unused
84	linux_writecomb_fini();
85fail3:	linux_workqueue_fini();
86fail2:	linux_kmap_fini();
87fail1:	linux_idr_module_fini();
88fail0:	return error;
89}
90
91int	linux_guarantee_initialized(void); /* XXX */
92int
93linux_guarantee_initialized(void)
94{
95#ifdef _MODULE
96	return 0;
97#else
98	static ONCE_DECL(linux_init_once);
99
100	return RUN_ONCE(&linux_init_once, &linux_init);
101#endif
102}
103
104static void
105linux_fini(void)
106{
107
108	linux_writecomb_fini();
109	linux_workqueue_fini();
110	linux_kmap_fini();
111	linux_idr_module_fini();
112}
113
114static int
115drmkms_linux_modcmd(modcmd_t cmd, void *arg __unused)
116{
117
118	switch (cmd) {
119	case MODULE_CMD_INIT:
120#ifdef _MODULE
121		return linux_init();
122#else
123		return linux_guarantee_initialized();
124#endif
125	case MODULE_CMD_FINI:
126		linux_fini();
127		return 0;
128	default:
129		return ENOTTY;
130	}
131}
132