1 /* $NetBSD: linux_module.c,v 1.8 2018/08/27 13:33:59 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 1.8 2018/08/27 13:33:59 riastradh Exp $"); 34 35 #include <sys/module.h> 36 #ifndef _MODULE 37 #include <sys/once.h> 38 #endif 39 40 #include <linux/highmem.h> 41 #include <linux/idr.h> 42 #include <linux/io.h> 43 #include <linux/mutex.h> 44 #include <linux/rcupdate.h> 45 #include <linux/workqueue.h> 46 47 MODULE(MODULE_CLASS_MISC, drmkms_linux, "i2cexec"); 48 49 static int 50 linux_init(void) 51 { 52 int error; 53 54 error = linux_idr_module_init(); 55 if (error) { 56 printf("linux: unable to initialize idr: %d\n", error); 57 goto fail0; 58 } 59 60 error = linux_kmap_init(); 61 if (error) { 62 printf("linux: unable to initialize kmap: %d\n", error); 63 goto fail1; 64 } 65 66 error = linux_rcu_gc_init(); 67 if (error) { 68 printf("linux: unable to initialize rcu gc: %d\n", error); 69 goto fail2; 70 } 71 72 error = linux_workqueue_init(); 73 if (error) { 74 printf("linux: unable to initialize workqueues: %d\n", error); 75 goto fail3; 76 } 77 78 error = linux_writecomb_init(); 79 if (error) { 80 printf("linux: unable to initialize write-combining: %d\n", 81 error); 82 goto fail4; 83 } 84 85 return 0; 86 87 fail5: __unused 88 linux_writecomb_fini(); 89 fail4: linux_workqueue_fini(); 90 fail3: linux_rcu_gc_fini(); 91 fail2: linux_kmap_fini(); 92 fail1: linux_idr_module_fini(); 93 fail0: return error; 94 } 95 96 int linux_guarantee_initialized(void); /* XXX */ 97 int 98 linux_guarantee_initialized(void) 99 { 100 #ifdef _MODULE 101 return 0; 102 #else 103 static ONCE_DECL(linux_init_once); 104 105 return RUN_ONCE(&linux_init_once, &linux_init); 106 #endif 107 } 108 109 static void 110 linux_fini(void) 111 { 112 113 linux_writecomb_fini(); 114 linux_workqueue_fini(); 115 linux_rcu_gc_fini(); 116 linux_kmap_fini(); 117 linux_idr_module_fini(); 118 } 119 120 static int 121 drmkms_linux_modcmd(modcmd_t cmd, void *arg __unused) 122 { 123 124 switch (cmd) { 125 case MODULE_CMD_INIT: 126 #ifdef _MODULE 127 return linux_init(); 128 #else 129 return linux_guarantee_initialized(); 130 #endif 131 case MODULE_CMD_FINI: 132 linux_fini(); 133 return 0; 134 default: 135 return ENOTTY; 136 } 137 } 138