1 /* $NetBSD: drm_module.c,v 1.32 2023/09/05 20:15:10 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 1.32 2023/09/05 20:15:10 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/drm_agpsupport.h> 48 #include <drm/drm_bridge.h> 49 #include <drm/drm_device.h> 50 #include <drm/drm_encoder_slave.h> 51 #include <drm/drm_panel.h> 52 #include <drm/drm_print.h> 53 #include <drm/drm_sysctl.h> 54 55 #include "../dist/drm/drm_crtc_internal.h" 56 #include "../dist/drm/drm_internal.h" 57 58 /* 59 * XXX This is stupid. 60 * 61 * 1. Builtin modules are broken: they don't get initialized before 62 * autoconf matches devices, but we need the initialization to be 63 * run in order to match and attach drmkms drivers. 64 * 65 * 2. The following dependencies are _not_ correct: 66 * - drmkms can't depend on agp because not all drmkms drivers run 67 * on platforms guaranteed to have pci, let alone agp 68 * - drmkms_pci can't depend on agp because not all _pci_ has agp 69 * (e.g., tegra) 70 * - radeon (e.g.) can't depend on agp because not all radeon 71 * devices are on platforms guaranteed to have agp 72 * 73 * 3. We need to register the agp hooks before we try to attach a 74 * device. 75 * 76 * 4. The only mechanism we have to force this is the 77 * mumblefrotz_guarantee_initialized kludge. 78 * 79 * 5. We don't know if we even _can_ call 80 * drmkms_agp_guarantee_initialized unless we know NAGP. 81 * 82 * 6. We don't know NAGP unless we include "agp.h". 83 * 84 * 7. We can't include "agp.h" if the platform has agp. 85 * 86 * 8. The way we determine whether we have agp is NAGP. 87 * 88 * 9. @!*#&^@&*@!&^#@ 89 */ 90 #if defined(__powerpc__) || defined(__i386__) || defined(__x86_64__) 91 #include "agp.h" 92 #include "drmkms_pci.h" 93 #endif 94 95 /* 96 * XXX I2C stuff should be moved to a separate drmkms_i2c module. 97 */ 98 MODULE(MODULE_CLASS_DRIVER, drmkms, "drmkms_linux,sysmon_power"); 99 100 struct mutex drm_global_mutex; 101 102 struct drm_sysctl_def drm_def = DRM_SYSCTL_INIT(); 103 104 static int 105 drm_init(void) 106 { 107 extern int linux_guarantee_initialized(void); 108 int error; 109 110 error = linux_guarantee_initialized(); 111 if (error) 112 return error; 113 114 extern bool drm_core_init_complete; 115 drm_core_init_complete = true; 116 117 drm_agp_hooks_init(); 118 #if NDRMKMS_PCI > 0 && NAGP > 0 119 extern int drmkms_agp_guarantee_initialized(void); 120 error = drmkms_agp_guarantee_initialized(); 121 if (error) { 122 drm_agp_hooks_fini(); 123 return error; 124 } 125 #endif 126 127 if (ISSET(boothowto, AB_DEBUG)) 128 __drm_debug = DRM_UT_DRIVER; 129 130 spin_lock_init(&drm_minor_lock); 131 idr_init(&drm_minors_idr); 132 _init_srcu_struct(&drm_unplug_srcu, "drmunplg"); 133 linux_mutex_init(&drm_global_mutex); 134 linux_mutex_init(&drm_kernel_fb_helper_lock); 135 drm_connector_ida_init(); 136 drm_panel_init_lock(); 137 drm_bridge_init_lock(); 138 drm_sysctl_init(&drm_def); 139 drm_i2c_encoders_init(); 140 141 return 0; 142 } 143 144 int 145 drm_guarantee_initialized(void) 146 { 147 #ifdef _MODULE 148 return 0; 149 #else 150 static ONCE_DECL(drm_init_once); 151 152 return RUN_ONCE(&drm_init_once, &drm_init); 153 #endif 154 } 155 156 static void 157 drm_fini(void) 158 { 159 160 drm_i2c_encoders_fini(); 161 drm_sysctl_fini(&drm_def); 162 drm_bridge_fini_lock(); 163 drm_panel_fini_lock(); 164 drm_connector_ida_destroy(); 165 linux_mutex_destroy(&drm_kernel_fb_helper_lock); 166 linux_mutex_destroy(&drm_global_mutex); 167 cleanup_srcu_struct(&drm_unplug_srcu); 168 idr_destroy(&drm_minors_idr); 169 spin_lock_destroy(&drm_minor_lock); 170 drm_agp_hooks_fini(); 171 } 172 173 int 174 drm_irq_by_busid(struct drm_device *dev, void *data, struct drm_file *file) 175 { 176 177 return -ENODEV; 178 } 179 180 static int 181 drmkms_modcmd(modcmd_t cmd, void *arg __unused) 182 { 183 #ifdef _MODULE 184 devmajor_t bmajor = NODEVMAJOR, cmajor = NODEVMAJOR; 185 #endif 186 int error; 187 188 switch (cmd) { 189 case MODULE_CMD_INIT: 190 #ifdef _MODULE 191 error = drm_init(); 192 #else 193 error = drm_guarantee_initialized(); 194 #endif 195 if (error) 196 return error; 197 #ifdef _MODULE 198 error = devsw_attach("drm", NULL, &bmajor, 199 &drm_cdevsw, &cmajor); 200 if (error) { 201 aprint_error("drmkms: unable to attach devsw: %d\n", 202 error); 203 return error; 204 } 205 #endif 206 return 0; 207 208 case MODULE_CMD_FINI: 209 #ifdef _MODULE 210 devsw_detach(NULL, &drm_cdevsw); 211 #endif 212 drm_fini(); 213 return 0; 214 215 default: 216 return ENOTTY; 217 } 218 } 219
Indexes created Mon Sep 22 05:09:51 GMT 2025