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