1 /* $NetBSD: linux_module.c,v 1.9 2018/08/27 15:08:54 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 1.9 2018/08/27 15:08:54 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/workqueue.h> 47 48 MODULE(MODULE_CLASS_MISC, drmkms_linux, "i2cexec"); 49 50 static int 51 linux_init(void) 52 { 53 int error; 54 55 error = linux_idr_module_init(); 56 if (error) { 57 printf("linux: unable to initialize idr: %d\n", error); 58 goto fail0; 59 } 60 61 error = linux_kmap_init(); 62 if (error) { 63 printf("linux: unable to initialize kmap: %d\n", error); 64 goto fail1; 65 } 66 67 error = linux_rcu_gc_init(); 68 if (error) { 69 printf("linux: unable to initialize rcu gc: %d\n", error); 70 goto fail2; 71 } 72 73 error = linux_workqueue_init(); 74 if (error) { 75 printf("linux: unable to initialize workqueues: %d\n", error); 76 goto fail3; 77 } 78 79 error = linux_writecomb_init(); 80 if (error) { 81 printf("linux: unable to initialize write-combining: %d\n", 82 error); 83 goto fail4; 84 } 85 86 error = linux_atomic64_init(); 87 if (error) { 88 printf("linux: unable to initialize atomic64: %d\n", error); 89 goto fail5; 90 } 91 92 return 0; 93 94 fail6: __unused 95 linux_atomic64_fini(); 96 fail5: linux_writecomb_fini(); 97 fail4: linux_workqueue_fini(); 98 fail3: linux_rcu_gc_fini(); 99 fail2: linux_kmap_fini(); 100 fail1: linux_idr_module_fini(); 101 fail0: return error; 102 } 103 104 int linux_guarantee_initialized(void); /* XXX */ 105 int 106 linux_guarantee_initialized(void) 107 { 108 #ifdef _MODULE 109 return 0; 110 #else 111 static ONCE_DECL(linux_init_once); 112 113 return RUN_ONCE(&linux_init_once, &linux_init); 114 #endif 115 } 116 117 static void 118 linux_fini(void) 119 { 120 121 linux_atomic64_fini(); 122 linux_writecomb_fini(); 123 linux_workqueue_fini(); 124 linux_rcu_gc_fini(); 125 linux_kmap_fini(); 126 linux_idr_module_fini(); 127 } 128 129 static int 130 drmkms_linux_modcmd(modcmd_t cmd, void *arg __unused) 131 { 132 133 switch (cmd) { 134 case MODULE_CMD_INIT: 135 #ifdef _MODULE 136 return linux_init(); 137 #else 138 return linux_guarantee_initialized(); 139 #endif 140 case MODULE_CMD_FINI: 141 linux_fini(); 142 return 0; 143 default: 144 return ENOTTY; 145 } 146 } 147