drm_module.c revision 1.16
1 /* $NetBSD: drm_module.c,v 1.16 2019/09/23 05:54:31 mrg Exp $ */ 2 3 /*- 4 * Copyright (c) 2013 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: drm_module.c,v 1.16 2019/09/23 05:54:31 mrg Exp $"); 34 35 #include <sys/types.h> 36 #include <sys/condvar.h> 37 #include <sys/conf.h> 38 #include <sys/device.h> 39 #include <sys/module.h> 40 #include <sys/mutex.h> 41 #include <sys/once.h> 42 #include <sys/reboot.h> 43 #include <sys/systm.h> 44 45 #include <linux/mutex.h> 46 47 #include <drm/drmP.h> 48 #include <drm/drm_encoder_slave.h> 49 #include <drm/drm_internal.h> 50 #include <drm/drm_sysctl.h> 51 52 /* 53 * XXX This is stupid. 54 * 55 * 1. Builtin modules are broken: they don't get initialized before 56 * autoconf matches devices, but we need the initialization to be 57 * run in order to match and attach drmkms drivers. 58 * 59 * 2. The following dependencies are _not_ correct: 60 * - drmkms can't depend on agp because not all drmkms drivers run 61 * on platforms guaranteed to have pci, let alone agp 62 * - drmkms_pci can't depend on agp because not all _pci_ has agp 63 * (e.g., tegra) 64 * - radeon (e.g.) can't depend on agp because not all radeon 65 * devices are on platforms guaranteed to have agp 66 * 67 * 3. We need to register the agp hooks before we try to attach a 68 * device. 69 * 70 * 4. The only mechanism we have to force this is the 71 * mumblefrotz_guarantee_initialized kludge. 72 * 73 * 5. We don't know if we even _can_ call 74 * drmkms_agp_guarantee_initialized unless we know NAGP. 75 * 76 * 6. We don't know NAGP unless we include "agp.h". 77 * 78 * 7. We can't include "agp.h" if the platform has agp. 79 * 80 * 8. The way we determine whether we have agp is NAGP. 81 * 82 * 9. @!*#&^@&*@!&^#@ 83 */ 84 #if defined(__powerpc__) || defined(__i386__) || defined(__x86_64__) 85 #include "agp.h" 86 #endif 87 88 /* 89 * XXX I2C stuff should be moved to a separate drmkms_i2c module. 90 */ 91 MODULE(MODULE_CLASS_DRIVER, drmkms, "drmkms_linux"); 92 93 struct mutex drm_global_mutex; 94 95 struct drm_sysctl_def drm_def = DRM_SYSCTL_INIT(); 96 97 static int 98 drm_init(void) 99 { 100 extern int linux_guarantee_initialized(void); 101 int error; 102 103 error = linux_guarantee_initialized(); 104 if (error) 105 return error; 106 107 drm_agp_hooks_init(); 108 #if NAGP > 0 109 extern int drmkms_agp_guarantee_initialized(void); 110 error = drmkms_agp_guarantee_initialized(); 111 if (error) { 112 drm_agp_hooks_fini(); 113 return error; 114 } 115 #endif 116 117 if (ISSET(boothowto, AB_DEBUG)) 118 drm_debug = DRM_UT_CORE | DRM_UT_DRIVER | DRM_UT_KMS; 119 120 spin_lock_init(&drm_minor_lock); 121 idr_init(&drm_minors_idr); 122 linux_mutex_init(&drm_global_mutex); 123 drm_connector_ida_init(); 124 drm_global_init(); 125 drm_sysctl_init(&drm_def); 126 drm_i2c_encoders_init(); 127 128 return 0; 129 } 130 131 int 132 drm_guarantee_initialized(void) 133 { 134 #ifdef _MODULE 135 return 0; 136 #else 137 static ONCE_DECL(drm_init_once); 138 139 return RUN_ONCE(&drm_init_once, &drm_init); 140 #endif 141 } 142 143 static void 144 drm_fini(void) 145 { 146 147 drm_i2c_encoders_fini(); 148 drm_sysctl_fini(&drm_def); 149 drm_global_release(); 150 drm_connector_ida_destroy(); 151 linux_mutex_destroy(&drm_global_mutex); 152 idr_destroy(&drm_minors_idr); 153 spin_lock_destroy(&drm_minor_lock); 154 drm_agp_hooks_fini(); 155 } 156 157 int 158 drm_irq_by_busid(struct drm_device *dev, void *data, struct drm_file *file) 159 { 160 161 return -ENODEV; 162 } 163 164 static int 165 drmkms_modcmd(modcmd_t cmd, void *arg __unused) 166 { 167 #ifdef _MODULE 168 devmajor_t bmajor = NODEVMAJOR, cmajor = NODEVMAJOR; 169 #endif 170 int error; 171 172 switch (cmd) { 173 case MODULE_CMD_INIT: 174 #ifdef _MODULE 175 error = drm_init(); 176 #else 177 error = drm_guarantee_initialized(); 178 #endif 179 if (error) 180 return error; 181 #ifdef _MODULE 182 error = devsw_attach("drm", NULL, &bmajor, 183 &drm_cdevsw, &cmajor); 184 if (error) { 185 aprint_error("drmkms: unable to attach devsw: %d\n", 186 error); 187 return error; 188 } 189 #endif 190 return 0; 191 192 case MODULE_CMD_FINI: 193 #ifdef _MODULE 194 error = devsw_detach(NULL, &drm_cdevsw); 195 if (error) 196 return error; 197 #endif 198 drm_fini(); 199 return 0; 200 201 default: 202 return ENOTTY; 203 } 204 } 205
Indexes created Tue Sep 23 07:09:52 GMT 2025