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linux_module.c revision 1.9 
      1 /*	$NetBSD: linux_module.c,v 1.9 2018/08/27 15:08:54 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 1.9 2018/08/27 15:08:54 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/workqueue.h>
     47 
     48 MODULE(MODULE_CLASS_MISC, drmkms_linux, "i2cexec");
     49 
     50 static int
     51 linux_init(void)
     52 {
     53 	int error;
     54 
     55 	error = linux_idr_module_init();
     56 	if (error) {
     57 		printf("linux: unable to initialize idr: %d\n", error);
     58 		goto fail0;
     59 	}
     60 
     61 	error = linux_kmap_init();
     62 	if (error) {
     63 		printf("linux: unable to initialize kmap: %d\n", error);
     64 		goto fail1;
     65 	}
     66 
     67 	error = linux_rcu_gc_init();
     68 	if (error) {
     69 		printf("linux: unable to initialize rcu gc: %d\n", error);
     70 		goto fail2;
     71 	}
     72 
     73 	error = linux_workqueue_init();
     74 	if (error) {
     75 		printf("linux: unable to initialize workqueues: %d\n", error);
     76 		goto fail3;
     77 	}
     78 
     79 	error = linux_writecomb_init();
     80 	if (error) {
     81 		printf("linux: unable to initialize write-combining: %d\n",
     82 		    error);
     83 		goto fail4;
     84 	}
     85 
     86 	error = linux_atomic64_init();
     87 	if (error) {
     88 		printf("linux: unable to initialize atomic64: %d\n", error);
     89 		goto fail5;
     90 	}
     91 
     92 	return 0;
     93 
     94 fail6: __unused
     95 	linux_atomic64_fini();
     96 fail5:	linux_writecomb_fini();
     97 fail4:	linux_workqueue_fini();
     98 fail3:	linux_rcu_gc_fini();
     99 fail2:	linux_kmap_fini();
    100 fail1:	linux_idr_module_fini();
    101 fail0:	return error;
    102 }
    103 
    104 int	linux_guarantee_initialized(void); /* XXX */
    105 int
    106 linux_guarantee_initialized(void)
    107 {
    108 #ifdef _MODULE
    109 	return 0;
    110 #else
    111 	static ONCE_DECL(linux_init_once);
    112 
    113 	return RUN_ONCE(&linux_init_once, &linux_init);
    114 #endif
    115 }
    116 
    117 static void
    118 linux_fini(void)
    119 {
    120 
    121 	linux_atomic64_fini();
    122 	linux_writecomb_fini();
    123 	linux_workqueue_fini();
    124 	linux_rcu_gc_fini();
    125 	linux_kmap_fini();
    126 	linux_idr_module_fini();
    127 }
    128 
    129 static int
    130 drmkms_linux_modcmd(modcmd_t cmd, void *arg __unused)
    131 {
    132 
    133 	switch (cmd) {
    134 	case MODULE_CMD_INIT:
    135 #ifdef _MODULE
    136 		return linux_init();
    137 #else
    138 		return linux_guarantee_initialized();
    139 #endif
    140 	case MODULE_CMD_FINI:
    141 		linux_fini();
    142 		return 0;
    143 	default:
    144 		return ENOTTY;
    145 	}
    146 }
    147