1 /* $NetBSD: linux_module.c,v 1.10 2021/12/19 01:17:14 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 1.10 2021/12/19 01:17:14 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/workqueue.h> 48 49 MODULE(MODULE_CLASS_MISC, drmkms_linux, "i2cexec"); 50 51 static int 52 linux_init(void) 53 { 54 int error; 55 56 error = linux_idr_module_init(); 57 if (error) { 58 printf("linux: unable to initialize idr: %d\n", error); 59 goto fail0; 60 } 61 62 error = linux_kmap_init(); 63 if (error) { 64 printf("linux: unable to initialize kmap: %d\n", error); 65 goto fail1; 66 } 67 68 error = linux_rcu_gc_init(); 69 if (error) { 70 printf("linux: unable to initialize rcu gc: %d\n", error); 71 goto fail2; 72 } 73 74 error = linux_workqueue_init(); 75 if (error) { 76 printf("linux: unable to initialize workqueues: %d\n", error); 77 goto fail3; 78 } 79 80 error = linux_writecomb_init(); 81 if (error) { 82 printf("linux: unable to initialize write-combining: %d\n", 83 error); 84 goto fail4; 85 } 86 87 error = linux_atomic64_init(); 88 if (error) { 89 printf("linux: unable to initialize atomic64: %d\n", error); 90 goto fail5; 91 } 92 93 error = linux_tasklets_init(); 94 if (error) { 95 printf("linux: unable to initialize tasklets: %d\n", error); 96 goto fail6; 97 } 98 99 return 0; 100 101 fail7: __unused 102 linux_tasklets_fini(); 103 fail6: linux_atomic64_fini(); 104 fail5: linux_writecomb_fini(); 105 fail4: linux_workqueue_fini(); 106 fail3: linux_rcu_gc_fini(); 107 fail2: linux_kmap_fini(); 108 fail1: linux_idr_module_fini(); 109 fail0: return error; 110 } 111 112 int linux_guarantee_initialized(void); /* XXX */ 113 int 114 linux_guarantee_initialized(void) 115 { 116 #ifdef _MODULE 117 return 0; 118 #else 119 static ONCE_DECL(linux_init_once); 120 121 return RUN_ONCE(&linux_init_once, &linux_init); 122 #endif 123 } 124 125 static void 126 linux_fini(void) 127 { 128 129 linux_tasklets_fini(); 130 linux_atomic64_fini(); 131 linux_writecomb_fini(); 132 linux_workqueue_fini(); 133 linux_rcu_gc_fini(); 134 linux_kmap_fini(); 135 linux_idr_module_fini(); 136 } 137 138 static int 139 drmkms_linux_modcmd(modcmd_t cmd, void *arg __unused) 140 { 141 142 switch (cmd) { 143 case MODULE_CMD_INIT: 144 #ifdef _MODULE 145 return linux_init(); 146 #else 147 return linux_guarantee_initialized(); 148 #endif 149 case MODULE_CMD_FINI: 150 linux_fini(); 151 return 0; 152 default: 153 return ENOTTY; 154 } 155 } 156