1 /* $NetBSD: linux_module.c,v 1.11 2021/12/19 01:22:15 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 1.11 2021/12/19 01:22:15 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/tasklet.h> 47 #include <linux/wait_bit.h> 48 #include <linux/workqueue.h> 49 50 MODULE(MODULE_CLASS_MISC, drmkms_linux, "i2cexec"); 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 error = linux_atomic64_init(); 89 if (error) { 90 printf("linux: unable to initialize atomic64: %d\n", error); 91 goto fail5; 92 } 93 94 error = linux_tasklets_init(); 95 if (error) { 96 printf("linux: unable to initialize tasklets: %d\n", error); 97 goto fail6; 98 } 99 100 error = linux_wait_bit_init(); 101 if (error) { 102 printf("linux: unable to initialize wait_bit: %d\n", error); 103 goto fail7; 104 } 105 106 return 0; 107 108 fail8: __unused 109 linux_wait_bit_fini(); 110 fail7: linux_tasklets_fini(); 111 fail6: linux_atomic64_fini(); 112 fail5: linux_writecomb_fini(); 113 fail4: linux_workqueue_fini(); 114 fail3: linux_rcu_gc_fini(); 115 fail2: linux_kmap_fini(); 116 fail1: linux_idr_module_fini(); 117 fail0: return error; 118 } 119 120 int linux_guarantee_initialized(void); /* XXX */ 121 int 122 linux_guarantee_initialized(void) 123 { 124 #ifdef _MODULE 125 return 0; 126 #else 127 static ONCE_DECL(linux_init_once); 128 129 return RUN_ONCE(&linux_init_once, &linux_init); 130 #endif 131 } 132 133 static void 134 linux_fini(void) 135 { 136 137 linux_wait_bit_fini(); 138 linux_tasklets_fini(); 139 linux_atomic64_fini(); 140 linux_writecomb_fini(); 141 linux_workqueue_fini(); 142 linux_rcu_gc_fini(); 143 linux_kmap_fini(); 144 linux_idr_module_fini(); 145 } 146 147 static int 148 drmkms_linux_modcmd(modcmd_t cmd, void *arg __unused) 149 { 150 151 switch (cmd) { 152 case MODULE_CMD_INIT: 153 #ifdef _MODULE 154 return linux_init(); 155 #else 156 return linux_guarantee_initialized(); 157 #endif 158 case MODULE_CMD_FINI: 159 linux_fini(); 160 return 0; 161 default: 162 return ENOTTY; 163 } 164 } 165