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linux_module.c revision 1.7 
      1 /*	$NetBSD: linux_module.c,v 1.7 2018/08/27 13:31:37 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 1.7 2018/08/27 13:31:37 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/rcupdate.h>
     45 #include <linux/reservation.h>
     46 #include <linux/workqueue.h>
     47 
     48 MODULE(MODULE_CLASS_MISC, drmkms_linux, "i2cexec");
     49 
     50 DEFINE_WW_CLASS(reservation_ww_class __cacheline_aligned);
     51 
     52 static int
     53 linux_init(void)
     54 {
     55 	int error;
     56 
     57 	error = linux_idr_module_init();
     58 	if (error) {
     59 		printf("linux: unable to initialize idr: %d\n", error);
     60 		goto fail0;
     61 	}
     62 
     63 	error = linux_kmap_init();
     64 	if (error) {
     65 		printf("linux: unable to initialize kmap: %d\n", error);
     66 		goto fail1;
     67 	}
     68 
     69 	error = linux_rcu_gc_init();
     70 	if (error) {
     71 		printf("linux: unable to initialize rcu gc: %d\n", error);
     72 		goto fail2;
     73 	}
     74 
     75 	error = linux_workqueue_init();
     76 	if (error) {
     77 		printf("linux: unable to initialize workqueues: %d\n", error);
     78 		goto fail3;
     79 	}
     80 
     81 	error = linux_writecomb_init();
     82 	if (error) {
     83 		printf("linux: unable to initialize write-combining: %d\n",
     84 		    error);
     85 		goto fail4;
     86 	}
     87 
     88 	return 0;
     89 
     90 fail5: __unused
     91 	linux_writecomb_fini();
     92 fail4:	linux_workqueue_fini();
     93 fail3:	linux_rcu_gc_fini();
     94 fail2:	linux_kmap_fini();
     95 fail1:	linux_idr_module_fini();
     96 fail0:	return error;
     97 }
     98 
     99 int	linux_guarantee_initialized(void); /* XXX */
    100 int
    101 linux_guarantee_initialized(void)
    102 {
    103 #ifdef _MODULE
    104 	return 0;
    105 #else
    106 	static ONCE_DECL(linux_init_once);
    107 
    108 	return RUN_ONCE(&linux_init_once, &linux_init);
    109 #endif
    110 }
    111 
    112 static void
    113 linux_fini(void)
    114 {
    115 
    116 	linux_writecomb_fini();
    117 	linux_workqueue_fini();
    118 	linux_rcu_gc_fini();
    119 	linux_kmap_fini();
    120 	linux_idr_module_fini();
    121 }
    122 
    123 static int
    124 drmkms_linux_modcmd(modcmd_t cmd, void *arg __unused)
    125 {
    126 
    127 	switch (cmd) {
    128 	case MODULE_CMD_INIT:
    129 #ifdef _MODULE
    130 		return linux_init();
    131 #else
    132 		return linux_guarantee_initialized();
    133 #endif
    134 	case MODULE_CMD_FINI:
    135 		linux_fini();
    136 		return 0;
    137 	default:
    138 		return ENOTTY;
    139 	}
    140 }
    141