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linux_module.c revision 1.13 
      1 /*	$NetBSD: linux_module.c,v 1.13 2021/12/19 12:23:07 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 1.13 2021/12/19 12:23:07 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/irq_work.h>
     45 #include <linux/kthread.h>
     46 #include <linux/mutex.h>
     47 #include <linux/rcupdate.h>
     48 #include <linux/tasklet.h>
     49 #include <linux/wait_bit.h>
     50 #include <linux/workqueue.h>
     51 
     52 MODULE(MODULE_CLASS_MISC, drmkms_linux, "i2cexec");
     53 
     54 static int
     55 linux_init(void)
     56 {
     57 	int error;
     58 
     59 	error = linux_idr_module_init();
     60 	if (error) {
     61 		printf("linux: unable to initialize idr: %d\n", error);
     62 		goto fail0;
     63 	}
     64 
     65 	error = linux_kmap_init();
     66 	if (error) {
     67 		printf("linux: unable to initialize kmap: %d\n", error);
     68 		goto fail1;
     69 	}
     70 
     71 	error = linux_rcu_gc_init();
     72 	if (error) {
     73 		printf("linux: unable to initialize rcu gc: %d\n", error);
     74 		goto fail2;
     75 	}
     76 
     77 	error = linux_workqueue_init();
     78 	if (error) {
     79 		printf("linux: unable to initialize workqueues: %d\n", error);
     80 		goto fail3;
     81 	}
     82 
     83 	error = linux_writecomb_init();
     84 	if (error) {
     85 		printf("linux: unable to initialize write-combining: %d\n",
     86 		    error);
     87 		goto fail4;
     88 	}
     89 
     90 	error = linux_atomic64_init();
     91 	if (error) {
     92 		printf("linux: unable to initialize atomic64: %d\n", error);
     93 		goto fail5;
     94 	}
     95 
     96 	error = linux_tasklets_init();
     97 	if (error) {
     98 		printf("linux: unable to initialize tasklets: %d\n", error);
     99 		goto fail6;
    100 	}
    101 
    102 	error = linux_wait_bit_init();
    103 	if (error) {
    104 		printf("linux: unable to initialize wait_bit: %d\n", error);
    105 		goto fail7;
    106 	}
    107 
    108 	error = linux_kthread_init();
    109 	if (error) {
    110 		printf("linux: unable to initialize kthread: %d\n", error);
    111 		goto fail8;
    112 	}
    113 
    114 	linux_irq_work_init();
    115 
    116 	return 0;
    117 
    118 fail9: __unused
    119 	linux_kthread_fini();
    120 fail8:	linux_wait_bit_fini();
    121 fail7:	linux_tasklets_fini();
    122 fail6:	linux_atomic64_fini();
    123 fail5:	linux_writecomb_fini();
    124 fail4:	linux_workqueue_fini();
    125 fail3:	linux_rcu_gc_fini();
    126 fail2:	linux_kmap_fini();
    127 fail1:	linux_idr_module_fini();
    128 fail0:	return error;
    129 }
    130 
    131 int	linux_guarantee_initialized(void); /* XXX */
    132 int
    133 linux_guarantee_initialized(void)
    134 {
    135 #ifdef _MODULE
    136 	return 0;
    137 #else
    138 	static ONCE_DECL(linux_init_once);
    139 
    140 	return RUN_ONCE(&linux_init_once, &linux_init);
    141 #endif
    142 }
    143 
    144 static void
    145 linux_fini(void)
    146 {
    147 
    148 	linux_irq_work_fini();
    149 	linux_kthread_fini();
    150 	linux_wait_bit_fini();
    151 	linux_tasklets_fini();
    152 	linux_atomic64_fini();
    153 	linux_writecomb_fini();
    154 	linux_workqueue_fini();
    155 	linux_rcu_gc_fini();
    156 	linux_kmap_fini();
    157 	linux_idr_module_fini();
    158 }
    159 
    160 static int
    161 drmkms_linux_modcmd(modcmd_t cmd, void *arg __unused)
    162 {
    163 
    164 	switch (cmd) {
    165 	case MODULE_CMD_INIT:
    166 #ifdef _MODULE
    167 		return linux_init();
    168 #else
    169 		return linux_guarantee_initialized();
    170 #endif
    171 	case MODULE_CMD_FINI:
    172 		linux_fini();
    173 		return 0;
    174 	default:
    175 		return ENOTTY;
    176 	}
    177 }
    178