drm_module.c revision 1.18
1 /* $NetBSD: drm_module.c,v 1.18 2021/12/19 00:28:20 riastradh 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 1.18 2021/12/19 00:28:20 riastradh 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_sysctl.h> 50 #include <drm/drm_panel.h> 51 52 #include "../dist/drm/drm_internal.h" 53 54 /* 55 * XXX This is stupid. 56 * 57 * 1. Builtin modules are broken: they don't get initialized before 58 * autoconf matches devices, but we need the initialization to be 59 * run in order to match and attach drmkms drivers. 60 * 61 * 2. The following dependencies are _not_ correct: 62 * - drmkms can't depend on agp because not all drmkms drivers run 63 * on platforms guaranteed to have pci, let alone agp 64 * - drmkms_pci can't depend on agp because not all _pci_ has agp 65 * (e.g., tegra) 66 * - radeon (e.g.) can't depend on agp because not all radeon 67 * devices are on platforms guaranteed to have agp 68 * 69 * 3. We need to register the agp hooks before we try to attach a 70 * device. 71 * 72 * 4. The only mechanism we have to force this is the 73 * mumblefrotz_guarantee_initialized kludge. 74 * 75 * 5. We don't know if we even _can_ call 76 * drmkms_agp_guarantee_initialized unless we know NAGP. 77 * 78 * 6. We don't know NAGP unless we include "agp.h". 79 * 80 * 7. We can't include "agp.h" if the platform has agp. 81 * 82 * 8. The way we determine whether we have agp is NAGP. 83 * 84 * 9. @!*#&^@&*@!&^#@ 85 */ 86 #if defined(__powerpc__) || defined(__i386__) || defined(__x86_64__) 87 #include "agp.h" 88 #endif 89 90 /* 91 * XXX I2C stuff should be moved to a separate drmkms_i2c module. 92 */ 93 MODULE(MODULE_CLASS_DRIVER, drmkms, "drmkms_linux"); 94 95 struct mutex drm_global_mutex; 96 97 struct drm_sysctl_def drm_def = DRM_SYSCTL_INIT(); 98 99 static int 100 drm_init(void) 101 { 102 extern int linux_guarantee_initialized(void); 103 int error; 104 105 error = linux_guarantee_initialized(); 106 if (error) 107 return error; 108 109 drm_agp_hooks_init(); 110 #if NAGP > 0 111 extern int drmkms_agp_guarantee_initialized(void); 112 error = drmkms_agp_guarantee_initialized(); 113 if (error) { 114 drm_agp_hooks_fini(); 115 return error; 116 } 117 #endif 118 119 if (ISSET(boothowto, AB_DEBUG)) 120 drm_debug = DRM_UT_CORE | DRM_UT_DRIVER | DRM_UT_KMS; 121 122 spin_lock_init(&drm_minor_lock); 123 idr_init(&drm_minors_idr); 124 linux_mutex_init(&drm_global_mutex); 125 drm_connector_ida_init(); 126 drm_global_init(); 127 drm_panel_init_lock(); 128 drm_bridge_init_lock(); 129 drm_sysctl_init(&drm_def); 130 drm_i2c_encoders_init(); 131 132 return 0; 133 } 134 135 int 136 drm_guarantee_initialized(void) 137 { 138 #ifdef _MODULE 139 return 0; 140 #else 141 static ONCE_DECL(drm_init_once); 142 143 return RUN_ONCE(&drm_init_once, &drm_init); 144 #endif 145 } 146 147 static void 148 drm_fini(void) 149 { 150 151 drm_i2c_encoders_fini(); 152 drm_sysctl_fini(&drm_def); 153 drm_bridge_fini_lock(); 154 drm_panel_fini_lock(); 155 drm_global_release(); 156 drm_connector_ida_destroy(); 157 linux_mutex_destroy(&drm_global_mutex); 158 idr_destroy(&drm_minors_idr); 159 spin_lock_destroy(&drm_minor_lock); 160 drm_agp_hooks_fini(); 161 } 162 163 int 164 drm_irq_by_busid(struct drm_device *dev, void *data, struct drm_file *file) 165 { 166 167 return -ENODEV; 168 } 169 170 static int 171 drmkms_modcmd(modcmd_t cmd, void *arg __unused) 172 { 173 #ifdef _MODULE 174 devmajor_t bmajor = NODEVMAJOR, cmajor = NODEVMAJOR; 175 #endif 176 int error; 177 178 switch (cmd) { 179 case MODULE_CMD_INIT: 180 #ifdef _MODULE 181 error = drm_init(); 182 #else 183 error = drm_guarantee_initialized(); 184 #endif 185 if (error) 186 return error; 187 #ifdef _MODULE 188 error = devsw_attach("drm", NULL, &bmajor, 189 &drm_cdevsw, &cmajor); 190 if (error) { 191 aprint_error("drmkms: unable to attach devsw: %d\n", 192 error); 193 return error; 194 } 195 #endif 196 return 0; 197 198 case MODULE_CMD_FINI: 199 #ifdef _MODULE 200 error = devsw_detach(NULL, &drm_cdevsw); 201 if (error) 202 return error; 203 #endif 204 drm_fini(); 205 return 0; 206 207 default: 208 return ENOTTY; 209 } 210 } 211
Indexes created Tue Sep 23 07:09:52 GMT 2025