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      1 /*	$NetBSD: linux_module.c,v 1.14 2022/09/01 01:54:38 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 1.14 2022/09/01 01:54:38 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/dma-fence.h>
     42 #include <linux/highmem.h>
     43 #include <linux/idr.h>
     44 #include <linux/io.h>
     45 #include <linux/irq_work.h>
     46 #include <linux/kthread.h>
     47 #include <linux/mutex.h>
     48 #include <linux/rcupdate.h>
     49 #include <linux/tasklet.h>
     50 #include <linux/wait_bit.h>
     51 #include <linux/workqueue.h>
     52 
     53 MODULE(MODULE_CLASS_MISC, drmkms_linux, "i2cexec");
     54 
     55 static int
     56 linux_init(void)
     57 {
     58 	int error;
     59 
     60 	error = linux_idr_module_init();
     61 	if (error) {
     62 		printf("linux: unable to initialize idr: %d\n", error);
     63 		goto fail0;
     64 	}
     65 
     66 	error = linux_kmap_init();
     67 	if (error) {
     68 		printf("linux: unable to initialize kmap: %d\n", error);
     69 		goto fail1;
     70 	}
     71 
     72 	error = linux_rcu_gc_init();
     73 	if (error) {
     74 		printf("linux: unable to initialize rcu gc: %d\n", error);
     75 		goto fail2;
     76 	}
     77 
     78 	error = linux_workqueue_init();
     79 	if (error) {
     80 		printf("linux: unable to initialize workqueues: %d\n", error);
     81 		goto fail3;
     82 	}
     83 
     84 	error = linux_writecomb_init();
     85 	if (error) {
     86 		printf("linux: unable to initialize write-combining: %d\n",
     87 		    error);
     88 		goto fail4;
     89 	}
     90 
     91 	error = linux_atomic64_init();
     92 	if (error) {
     93 		printf("linux: unable to initialize atomic64: %d\n", error);
     94 		goto fail5;
     95 	}
     96 
     97 	error = linux_tasklets_init();
     98 	if (error) {
     99 		printf("linux: unable to initialize tasklets: %d\n", error);
    100 		goto fail6;
    101 	}
    102 
    103 	error = linux_wait_bit_init();
    104 	if (error) {
    105 		printf("linux: unable to initialize wait_bit: %d\n", error);
    106 		goto fail7;
    107 	}
    108 
    109 	error = linux_kthread_init();
    110 	if (error) {
    111 		printf("linux: unable to initialize kthread: %d\n", error);
    112 		goto fail8;
    113 	}
    114 
    115 	linux_irq_work_init();
    116 	linux_dma_fences_init();
    117 
    118 	return 0;
    119 
    120 fail9: __unused
    121 	linux_kthread_fini();
    122 fail8:	linux_wait_bit_fini();
    123 fail7:	linux_tasklets_fini();
    124 fail6:	linux_atomic64_fini();
    125 fail5:	linux_writecomb_fini();
    126 fail4:	linux_workqueue_fini();
    127 fail3:	linux_rcu_gc_fini();
    128 fail2:	linux_kmap_fini();
    129 fail1:	linux_idr_module_fini();
    130 fail0:	return error;
    131 }
    132 
    133 int	linux_guarantee_initialized(void); /* XXX */
    134 int
    135 linux_guarantee_initialized(void)
    136 {
    137 #ifdef _MODULE
    138 	return 0;
    139 #else
    140 	static ONCE_DECL(linux_init_once);
    141 
    142 	return RUN_ONCE(&linux_init_once, &linux_init);
    143 #endif
    144 }
    145 
    146 static void
    147 linux_fini(void)
    148 {
    149 
    150 	linux_dma_fences_fini();
    151 	linux_irq_work_fini();
    152 	linux_kthread_fini();
    153 	linux_wait_bit_fini();
    154 	linux_tasklets_fini();
    155 	linux_atomic64_fini();
    156 	linux_writecomb_fini();
    157 	linux_workqueue_fini();
    158 	linux_rcu_gc_fini();
    159 	linux_kmap_fini();
    160 	linux_idr_module_fini();
    161 }
    162 
    163 static int
    164 drmkms_linux_modcmd(modcmd_t cmd, void *arg __unused)
    165 {
    166 
    167 	switch (cmd) {
    168 	case MODULE_CMD_INIT:
    169 #ifdef _MODULE
    170 		return linux_init();
    171 #else
    172 		return linux_guarantee_initialized();
    173 #endif
    174 	case MODULE_CMD_FINI:
    175 		linux_fini();
    176 		return 0;
    177 	default:
    178 		return ENOTTY;
    179 	}
    180 }
    181