1 /* $NetBSD: linux_module.c,v 1.6 2015/04/13 22:24:34 pgoyette 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 1.6 2015/04/13 22:24:34 pgoyette 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/reservation.h> 45 #include <linux/workqueue.h> 46 47 MODULE(MODULE_CLASS_MISC, drmkms_linux, "i2cexec"); 48 49 DEFINE_WW_CLASS(reservation_ww_class __cacheline_aligned); 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_workqueue_init(); 69 if (error) { 70 printf("linux: unable to initialize workqueues: %d\n", error); 71 goto fail2; 72 } 73 74 error = linux_writecomb_init(); 75 if (error) { 76 printf("linux: unable to initialize write-combining: %d\n", 77 error); 78 goto fail3; 79 } 80 81 return 0; 82 83 fail4: __unused 84 linux_writecomb_fini(); 85 fail3: linux_workqueue_fini(); 86 fail2: linux_kmap_fini(); 87 fail1: linux_idr_module_fini(); 88 fail0: return error; 89 } 90 91 int linux_guarantee_initialized(void); /* XXX */ 92 int 93 linux_guarantee_initialized(void) 94 { 95 #ifdef _MODULE 96 return 0; 97 #else 98 static ONCE_DECL(linux_init_once); 99 100 return RUN_ONCE(&linux_init_once, &linux_init); 101 #endif 102 } 103 104 static void 105 linux_fini(void) 106 { 107 108 linux_writecomb_fini(); 109 linux_workqueue_fini(); 110 linux_kmap_fini(); 111 linux_idr_module_fini(); 112 } 113 114 static int 115 drmkms_linux_modcmd(modcmd_t cmd, void *arg __unused) 116 { 117 118 switch (cmd) { 119 case MODULE_CMD_INIT: 120 #ifdef _MODULE 121 return linux_init(); 122 #else 123 return linux_guarantee_initialized(); 124 #endif 125 case MODULE_CMD_FINI: 126 linux_fini(); 127 return 0; 128 default: 129 return ENOTTY; 130 } 131 } 132