drm_module.c revision 1.17
1 /* $NetBSD: drm_module.c,v 1.17 2020/01/03 21:01:16 jmcneill 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 1.17 2020/01/03 21:01:16 jmcneill 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 #include <drm/drm_panel.h> 52 53 /* 54 * XXX This is stupid. 55 * 56 * 1. Builtin modules are broken: they don't get initialized before 57 * autoconf matches devices, but we need the initialization to be 58 * run in order to match and attach drmkms drivers. 59 * 60 * 2. The following dependencies are _not_ correct: 61 * - drmkms can't depend on agp because not all drmkms drivers run 62 * on platforms guaranteed to have pci, let alone agp 63 * - drmkms_pci can't depend on agp because not all _pci_ has agp 64 * (e.g., tegra) 65 * - radeon (e.g.) can't depend on agp because not all radeon 66 * devices are on platforms guaranteed to have agp 67 * 68 * 3. We need to register the agp hooks before we try to attach a 69 * device. 70 * 71 * 4. The only mechanism we have to force this is the 72 * mumblefrotz_guarantee_initialized kludge. 73 * 74 * 5. We don't know if we even _can_ call 75 * drmkms_agp_guarantee_initialized unless we know NAGP. 76 * 77 * 6. We don't know NAGP unless we include "agp.h". 78 * 79 * 7. We can't include "agp.h" if the platform has agp. 80 * 81 * 8. The way we determine whether we have agp is NAGP. 82 * 83 * 9. @!*#&^@&*@!&^#@ 84 */ 85 #if defined(__powerpc__) || defined(__i386__) || defined(__x86_64__) 86 #include "agp.h" 87 #endif 88 89 /* 90 * XXX I2C stuff should be moved to a separate drmkms_i2c module. 91 */ 92 MODULE(MODULE_CLASS_DRIVER, drmkms, "drmkms_linux"); 93 94 struct mutex drm_global_mutex; 95 96 struct drm_sysctl_def drm_def = DRM_SYSCTL_INIT(); 97 98 static int 99 drm_init(void) 100 { 101 extern int linux_guarantee_initialized(void); 102 int error; 103 104 error = linux_guarantee_initialized(); 105 if (error) 106 return error; 107 108 drm_agp_hooks_init(); 109 #if NAGP > 0 110 extern int drmkms_agp_guarantee_initialized(void); 111 error = drmkms_agp_guarantee_initialized(); 112 if (error) { 113 drm_agp_hooks_fini(); 114 return error; 115 } 116 #endif 117 118 if (ISSET(boothowto, AB_DEBUG)) 119 drm_debug = DRM_UT_CORE | DRM_UT_DRIVER | DRM_UT_KMS; 120 121 spin_lock_init(&drm_minor_lock); 122 idr_init(&drm_minors_idr); 123 linux_mutex_init(&drm_global_mutex); 124 drm_connector_ida_init(); 125 drm_global_init(); 126 drm_panel_init_lock(); 127 drm_bridge_init_lock(); 128 drm_sysctl_init(&drm_def); 129 drm_i2c_encoders_init(); 130 131 return 0; 132 } 133 134 int 135 drm_guarantee_initialized(void) 136 { 137 #ifdef _MODULE 138 return 0; 139 #else 140 static ONCE_DECL(drm_init_once); 141 142 return RUN_ONCE(&drm_init_once, &drm_init); 143 #endif 144 } 145 146 static void 147 drm_fini(void) 148 { 149 150 drm_i2c_encoders_fini(); 151 drm_sysctl_fini(&drm_def); 152 drm_bridge_fini_lock(); 153 drm_panel_fini_lock(); 154 drm_global_release(); 155 drm_connector_ida_destroy(); 156 linux_mutex_destroy(&drm_global_mutex); 157 idr_destroy(&drm_minors_idr); 158 spin_lock_destroy(&drm_minor_lock); 159 drm_agp_hooks_fini(); 160 } 161 162 int 163 drm_irq_by_busid(struct drm_device *dev, void *data, struct drm_file *file) 164 { 165 166 return -ENODEV; 167 } 168 169 static int 170 drmkms_modcmd(modcmd_t cmd, void *arg __unused) 171 { 172 #ifdef _MODULE 173 devmajor_t bmajor = NODEVMAJOR, cmajor = NODEVMAJOR; 174 #endif 175 int error; 176 177 switch (cmd) { 178 case MODULE_CMD_INIT: 179 #ifdef _MODULE 180 error = drm_init(); 181 #else 182 error = drm_guarantee_initialized(); 183 #endif 184 if (error) 185 return error; 186 #ifdef _MODULE 187 error = devsw_attach("drm", NULL, &bmajor, 188 &drm_cdevsw, &cmajor); 189 if (error) { 190 aprint_error("drmkms: unable to attach devsw: %d\n", 191 error); 192 return error; 193 } 194 #endif 195 return 0; 196 197 case MODULE_CMD_FINI: 198 #ifdef _MODULE 199 error = devsw_detach(NULL, &drm_cdevsw); 200 if (error) 201 return error; 202 #endif 203 drm_fini(); 204 return 0; 205 206 default: 207 return ENOTTY; 208 } 209 } 210
Indexes created Tue Sep 23 13:09:54 GMT 2025