1 /** 2 * \file drm_drv.c 3 * Generic driver template 4 * 5 * \author Rickard E. (Rik) Faith <faith@valinux.com> 6 * \author Gareth Hughes <gareth@valinux.com> 7 * 8 * To use this template, you must at least define the following (samples 9 * given for the MGA driver): 10 * 11 * \code 12 * #define DRIVER_AUTHOR "VA Linux Systems, Inc." 13 * 14 * #define DRIVER_NAME "mga" 15 * #define DRIVER_DESC "Matrox G200/G400" 16 * #define DRIVER_DATE "20001127" 17 * 18 * #define drm_x mga_##x 19 * \endcode 20 */ 21 22 /* 23 * Created: Thu Nov 23 03:10:50 2000 by gareth@valinux.com 24 * 25 * Copyright 1999, 2000 Precision Insight, Inc., Cedar Park, Texas. 26 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California. 27 * All Rights Reserved. 28 * 29 * Permission is hereby granted, free of charge, to any person obtaining a 30 * copy of this software and associated documentation files (the "Software"), 31 * to deal in the Software without restriction, including without limitation 32 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 33 * and/or sell copies of the Software, and to permit persons to whom the 34 * Software is furnished to do so, subject to the following conditions: 35 * 36 * The above copyright notice and this permission notice (including the next 37 * paragraph) shall be included in all copies or substantial portions of the 38 * Software. 39 * 40 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 41 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 42 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 43 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR 44 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 45 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR 46 * OTHER DEALINGS IN THE SOFTWARE. 47 */ 48 49 #include <linux/debugfs.h> 50 #include <linux/slab.h> 51 #include "drmP.h" 52 #include "drm_core.h" 53 54 55 static int drm_version(struct drm_device *dev, void *data, 56 struct drm_file *file_priv); 57 58 #define DRM_IOCTL_DEF(ioctl, _func, _flags) \ 59 [DRM_IOCTL_NR(ioctl)] = {.cmd = ioctl, .func = _func, .flags = _flags, .cmd_drv = 0} 60 61 /** Ioctl table */ 62 static struct drm_ioctl_desc drm_ioctls[] = { 63 DRM_IOCTL_DEF(DRM_IOCTL_VERSION, drm_version, 0), 64 DRM_IOCTL_DEF(DRM_IOCTL_GET_UNIQUE, drm_getunique, 0), 65 DRM_IOCTL_DEF(DRM_IOCTL_GET_MAGIC, drm_getmagic, 0), 66 DRM_IOCTL_DEF(DRM_IOCTL_IRQ_BUSID, drm_irq_by_busid, DRM_MASTER|DRM_ROOT_ONLY), 67 DRM_IOCTL_DEF(DRM_IOCTL_GET_MAP, drm_getmap, 0), 68 DRM_IOCTL_DEF(DRM_IOCTL_GET_CLIENT, drm_getclient, 0), 69 DRM_IOCTL_DEF(DRM_IOCTL_GET_STATS, drm_getstats, 0), 70 DRM_IOCTL_DEF(DRM_IOCTL_SET_VERSION, drm_setversion, DRM_MASTER), 71 72 DRM_IOCTL_DEF(DRM_IOCTL_SET_UNIQUE, drm_setunique, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 73 DRM_IOCTL_DEF(DRM_IOCTL_BLOCK, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 74 DRM_IOCTL_DEF(DRM_IOCTL_UNBLOCK, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 75 DRM_IOCTL_DEF(DRM_IOCTL_AUTH_MAGIC, drm_authmagic, DRM_AUTH|DRM_MASTER), 76 77 DRM_IOCTL_DEF(DRM_IOCTL_ADD_MAP, drm_addmap_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 78 DRM_IOCTL_DEF(DRM_IOCTL_RM_MAP, drm_rmmap_ioctl, DRM_AUTH), 79 80 DRM_IOCTL_DEF(DRM_IOCTL_SET_SAREA_CTX, drm_setsareactx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 81 DRM_IOCTL_DEF(DRM_IOCTL_GET_SAREA_CTX, drm_getsareactx, DRM_AUTH), 82 83 DRM_IOCTL_DEF(DRM_IOCTL_SET_MASTER, drm_setmaster_ioctl, DRM_ROOT_ONLY), 84 DRM_IOCTL_DEF(DRM_IOCTL_DROP_MASTER, drm_dropmaster_ioctl, DRM_ROOT_ONLY), 85 86 DRM_IOCTL_DEF(DRM_IOCTL_ADD_CTX, drm_addctx, DRM_AUTH|DRM_ROOT_ONLY), 87 DRM_IOCTL_DEF(DRM_IOCTL_RM_CTX, drm_rmctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 88 DRM_IOCTL_DEF(DRM_IOCTL_MOD_CTX, drm_modctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 89 DRM_IOCTL_DEF(DRM_IOCTL_GET_CTX, drm_getctx, DRM_AUTH), 90 DRM_IOCTL_DEF(DRM_IOCTL_SWITCH_CTX, drm_switchctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 91 DRM_IOCTL_DEF(DRM_IOCTL_NEW_CTX, drm_newctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 92 DRM_IOCTL_DEF(DRM_IOCTL_RES_CTX, drm_resctx, DRM_AUTH), 93 94 DRM_IOCTL_DEF(DRM_IOCTL_ADD_DRAW, drm_adddraw, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 95 DRM_IOCTL_DEF(DRM_IOCTL_RM_DRAW, drm_rmdraw, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 96 97 DRM_IOCTL_DEF(DRM_IOCTL_LOCK, drm_lock, DRM_AUTH), 98 DRM_IOCTL_DEF(DRM_IOCTL_UNLOCK, drm_unlock, DRM_AUTH), 99 100 DRM_IOCTL_DEF(DRM_IOCTL_FINISH, drm_noop, DRM_AUTH), 101 102 DRM_IOCTL_DEF(DRM_IOCTL_ADD_BUFS, drm_addbufs, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 103 DRM_IOCTL_DEF(DRM_IOCTL_MARK_BUFS, drm_markbufs, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 104 DRM_IOCTL_DEF(DRM_IOCTL_INFO_BUFS, drm_infobufs, DRM_AUTH), 105 DRM_IOCTL_DEF(DRM_IOCTL_MAP_BUFS, drm_mapbufs, DRM_AUTH), 106 DRM_IOCTL_DEF(DRM_IOCTL_FREE_BUFS, drm_freebufs, DRM_AUTH), 107 /* The DRM_IOCTL_DMA ioctl should be defined by the driver. */ 108 DRM_IOCTL_DEF(DRM_IOCTL_DMA, NULL, DRM_AUTH), 109 110 DRM_IOCTL_DEF(DRM_IOCTL_CONTROL, drm_control, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 111 112 #if __OS_HAS_AGP 113 DRM_IOCTL_DEF(DRM_IOCTL_AGP_ACQUIRE, drm_agp_acquire_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 114 DRM_IOCTL_DEF(DRM_IOCTL_AGP_RELEASE, drm_agp_release_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 115 DRM_IOCTL_DEF(DRM_IOCTL_AGP_ENABLE, drm_agp_enable_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 116 DRM_IOCTL_DEF(DRM_IOCTL_AGP_INFO, drm_agp_info_ioctl, DRM_AUTH), 117 DRM_IOCTL_DEF(DRM_IOCTL_AGP_ALLOC, drm_agp_alloc_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 118 DRM_IOCTL_DEF(DRM_IOCTL_AGP_FREE, drm_agp_free_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 119 DRM_IOCTL_DEF(DRM_IOCTL_AGP_BIND, drm_agp_bind_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 120 DRM_IOCTL_DEF(DRM_IOCTL_AGP_UNBIND, drm_agp_unbind_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 121 #endif 122 123 DRM_IOCTL_DEF(DRM_IOCTL_SG_ALLOC, drm_sg_alloc_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 124 DRM_IOCTL_DEF(DRM_IOCTL_SG_FREE, drm_sg_free, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 125 126 DRM_IOCTL_DEF(DRM_IOCTL_WAIT_VBLANK, drm_wait_vblank, 0), 127 128 DRM_IOCTL_DEF(DRM_IOCTL_MODESET_CTL, drm_modeset_ctl, 0), 129 130 DRM_IOCTL_DEF(DRM_IOCTL_UPDATE_DRAW, drm_update_drawable_info, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 131 132 DRM_IOCTL_DEF(DRM_IOCTL_GEM_CLOSE, drm_gem_close_ioctl, DRM_UNLOCKED), 133 DRM_IOCTL_DEF(DRM_IOCTL_GEM_FLINK, drm_gem_flink_ioctl, DRM_AUTH|DRM_UNLOCKED), 134 DRM_IOCTL_DEF(DRM_IOCTL_GEM_OPEN, drm_gem_open_ioctl, DRM_AUTH|DRM_UNLOCKED), 135 136 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETRESOURCES, drm_mode_getresources, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 137 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETCRTC, drm_mode_getcrtc, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 138 DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETCRTC, drm_mode_setcrtc, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 139 DRM_IOCTL_DEF(DRM_IOCTL_MODE_CURSOR, drm_mode_cursor_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 140 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETGAMMA, drm_mode_gamma_get_ioctl, DRM_MASTER|DRM_UNLOCKED), 141 DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETGAMMA, drm_mode_gamma_set_ioctl, DRM_MASTER|DRM_UNLOCKED), 142 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETENCODER, drm_mode_getencoder, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 143 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETCONNECTOR, drm_mode_getconnector, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 144 DRM_IOCTL_DEF(DRM_IOCTL_MODE_ATTACHMODE, drm_mode_attachmode_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 145 DRM_IOCTL_DEF(DRM_IOCTL_MODE_DETACHMODE, drm_mode_detachmode_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 146 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPROPERTY, drm_mode_getproperty_ioctl, DRM_MASTER | DRM_CONTROL_ALLOW|DRM_UNLOCKED), 147 DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETPROPERTY, drm_mode_connector_property_set_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 148 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPROPBLOB, drm_mode_getblob_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 149 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETFB, drm_mode_getfb, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 150 DRM_IOCTL_DEF(DRM_IOCTL_MODE_ADDFB, drm_mode_addfb, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 151 DRM_IOCTL_DEF(DRM_IOCTL_MODE_RMFB, drm_mode_rmfb, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 152 DRM_IOCTL_DEF(DRM_IOCTL_MODE_PAGE_FLIP, drm_mode_page_flip_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 153 DRM_IOCTL_DEF(DRM_IOCTL_MODE_DIRTYFB, drm_mode_dirtyfb_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED) 154 }; 155 156 #define DRM_CORE_IOCTL_COUNT ARRAY_SIZE( drm_ioctls ) 157 158 /** 159 * Take down the DRM device. 160 * 161 * \param dev DRM device structure. 162 * 163 * Frees every resource in \p dev. 164 * 165 * \sa drm_device 166 */ 167 int drm_lastclose(struct drm_device * dev) 168 { 169 struct drm_vma_entry *vma, *vma_temp; 170 int i; 171 172 DRM_DEBUG("\n"); 173 174 if (dev->driver->lastclose) 175 dev->driver->lastclose(dev); 176 DRM_DEBUG("driver lastclose completed\n"); 177 178 if (dev->irq_enabled && !drm_core_check_feature(dev, DRIVER_MODESET)) 179 drm_irq_uninstall(dev); 180 181 mutex_lock(&dev->struct_mutex); 182 183 /* Free drawable information memory */ 184 drm_drawable_free_all(dev); 185 del_timer(&dev->timer); 186 187 /* Clear AGP information */ 188 if (drm_core_has_AGP(dev) && dev->agp && 189 !drm_core_check_feature(dev, DRIVER_MODESET)) { 190 struct drm_agp_mem *entry, *tempe; 191 192 /* Remove AGP resources, but leave dev->agp 193 intact until drv_cleanup is called. */ 194 list_for_each_entry_safe(entry, tempe, &dev->agp->memory, head) { 195 if (entry->bound) 196 drm_unbind_agp(entry->memory); 197 drm_free_agp(entry->memory, entry->pages); 198 kfree(entry); 199 } 200 INIT_LIST_HEAD(&dev->agp->memory); 201 202 if (dev->agp->acquired) 203 drm_agp_release(dev); 204 205 dev->agp->acquired = 0; 206 dev->agp->enabled = 0; 207 } 208 if (drm_core_check_feature(dev, DRIVER_SG) && dev->sg && 209 !drm_core_check_feature(dev, DRIVER_MODESET)) { 210 drm_sg_cleanup(dev->sg); 211 dev->sg = NULL; 212 } 213 214 /* Clear vma list (only built for debugging) */ 215 list_for_each_entry_safe(vma, vma_temp, &dev->vmalist, head) { 216 list_del(&vma->head); 217 kfree(vma); 218 } 219 220 if (drm_core_check_feature(dev, DRIVER_DMA_QUEUE) && dev->queuelist) { 221 for (i = 0; i < dev->queue_count; i++) { 222 kfree(dev->queuelist[i]); 223 dev->queuelist[i] = NULL; 224 } 225 kfree(dev->queuelist); 226 dev->queuelist = NULL; 227 } 228 dev->queue_count = 0; 229 230 if (drm_core_check_feature(dev, DRIVER_HAVE_DMA) && 231 !drm_core_check_feature(dev, DRIVER_MODESET)) 232 drm_dma_takedown(dev); 233 234 dev->dev_mapping = NULL; 235 mutex_unlock(&dev->struct_mutex); 236 237 DRM_DEBUG("lastclose completed\n"); 238 return 0; 239 } 240 241 /** 242 * Module initialization. Called via init_module at module load time, or via 243 * linux/init/main.c (this is not currently supported). 244 * 245 * \return zero on success or a negative number on failure. 246 * 247 * Initializes an array of drm_device structures, and attempts to 248 * initialize all available devices, using consecutive minors, registering the 249 * stubs and initializing the device. 250 * 251 * Expands the \c DRIVER_PREINIT and \c DRIVER_POST_INIT macros before and 252 * after the initialization for driver customization. 253 */ 254 int drm_init(struct drm_driver *driver) 255 { 256 DRM_DEBUG("\n"); 257 INIT_LIST_HEAD(&driver->device_list); 258 259 if (driver->driver_features & DRIVER_USE_PLATFORM_DEVICE) 260 return drm_platform_init(driver); 261 else 262 return drm_pci_init(driver); 263 } 264 265 EXPORT_SYMBOL(drm_init); 266 267 void drm_exit(struct drm_driver *driver) 268 { 269 struct drm_device *dev, *tmp; 270 DRM_DEBUG("\n"); 271 272 if (driver->driver_features & DRIVER_MODESET) { 273 pci_unregister_driver(&driver->pci_driver); 274 } else { 275 list_for_each_entry_safe(dev, tmp, &driver->device_list, driver_item) 276 drm_put_dev(dev); 277 } 278 279 DRM_INFO("Module unloaded\n"); 280 } 281 282 EXPORT_SYMBOL(drm_exit); 283 284 /** File operations structure */ 285 static const struct file_operations drm_stub_fops = { 286 .owner = THIS_MODULE, 287 .open = drm_stub_open, 288 .llseek = noop_llseek, 289 }; 290 291 static int __init drm_core_init(void) 292 { 293 int ret = -ENOMEM; 294 295 drm_global_init(); 296 idr_init(&drm_minors_idr); 297 298 if (register_chrdev(DRM_MAJOR, "drm", &drm_stub_fops)) 299 goto err_p1; 300 301 drm_class = drm_sysfs_create(THIS_MODULE, "drm"); 302 if (IS_ERR(drm_class)) { 303 printk(KERN_ERR "DRM: Error creating drm class.\n"); 304 ret = PTR_ERR(drm_class); 305 goto err_p2; 306 } 307 308 drm_proc_root = proc_mkdir("dri", NULL); 309 if (!drm_proc_root) { 310 DRM_ERROR("Cannot create /proc/dri\n"); 311 ret = -1; 312 goto err_p3; 313 } 314 315 drm_debugfs_root = debugfs_create_dir("dri", NULL); 316 if (!drm_debugfs_root) { 317 DRM_ERROR("Cannot create /sys/kernel/debug/dri\n"); 318 ret = -1; 319 goto err_p3; 320 } 321 322 DRM_INFO("Initialized %s %d.%d.%d %s\n", 323 CORE_NAME, CORE_MAJOR, CORE_MINOR, CORE_PATCHLEVEL, CORE_DATE); 324 return 0; 325 err_p3: 326 drm_sysfs_destroy(); 327 err_p2: 328 unregister_chrdev(DRM_MAJOR, "drm"); 329 330 idr_destroy(&drm_minors_idr); 331 err_p1: 332 return ret; 333 } 334 335 static void __exit drm_core_exit(void) 336 { 337 remove_proc_entry("dri", NULL); 338 debugfs_remove(drm_debugfs_root); 339 drm_sysfs_destroy(); 340 341 unregister_chrdev(DRM_MAJOR, "drm"); 342 343 idr_remove_all(&drm_minors_idr); 344 idr_destroy(&drm_minors_idr); 345 } 346 347 module_init(drm_core_init); 348 module_exit(drm_core_exit); 349 350 /** 351 * Copy and IOCTL return string to user space 352 */ 353 static int drm_copy_field(char *buf, size_t *buf_len, const char *value) 354 { 355 int len; 356 357 /* don't overflow userbuf */ 358 len = strlen(value); 359 if (len > *buf_len) 360 len = *buf_len; 361 362 /* let userspace know exact length of driver value (which could be 363 * larger than the userspace-supplied buffer) */ 364 *buf_len = strlen(value); 365 366 /* finally, try filling in the userbuf */ 367 if (len && buf) 368 if (copy_to_user(buf, value, len)) 369 return -EFAULT; 370 return 0; 371 } 372 373 /** 374 * Get version information 375 * 376 * \param inode device inode. 377 * \param filp file pointer. 378 * \param cmd command. 379 * \param arg user argument, pointing to a drm_version structure. 380 * \return zero on success or negative number on failure. 381 * 382 * Fills in the version information in \p arg. 383 */ 384 static int drm_version(struct drm_device *dev, void *data, 385 struct drm_file *file_priv) 386 { 387 struct drm_version *version = data; 388 int err; 389 390 version->version_major = dev->driver->major; 391 version->version_minor = dev->driver->minor; 392 version->version_patchlevel = dev->driver->patchlevel; 393 err = drm_copy_field(version->name, &version->name_len, 394 dev->driver->name); 395 if (!err) 396 err = drm_copy_field(version->date, &version->date_len, 397 dev->driver->date); 398 if (!err) 399 err = drm_copy_field(version->desc, &version->desc_len, 400 dev->driver->desc); 401 402 return err; 403 } 404 405 /** 406 * Called whenever a process performs an ioctl on /dev/drm. 407 * 408 * \param inode device inode. 409 * \param file_priv DRM file private. 410 * \param cmd command. 411 * \param arg user argument. 412 * \return zero on success or negative number on failure. 413 * 414 * Looks up the ioctl function in the ::ioctls table, checking for root 415 * previleges if so required, and dispatches to the respective function. 416 */ 417 long drm_ioctl(struct file *filp, 418 unsigned int cmd, unsigned long arg) 419 { 420 struct drm_file *file_priv = filp->private_data; 421 struct drm_device *dev; 422 struct drm_ioctl_desc *ioctl; 423 drm_ioctl_t *func; 424 unsigned int nr = DRM_IOCTL_NR(cmd); 425 int retcode = -EINVAL; 426 char stack_kdata[128]; 427 char *kdata = NULL; 428 unsigned int usize, asize; 429 430 dev = file_priv->minor->dev; 431 atomic_inc(&dev->ioctl_count); 432 atomic_inc(&dev->counts[_DRM_STAT_IOCTLS]); 433 ++file_priv->ioctl_count; 434 435 DRM_DEBUG("pid=%d, cmd=0x%02x, nr=0x%02x, dev 0x%lx, auth=%d\n", 436 task_pid_nr(current), cmd, nr, 437 (long)old_encode_dev(file_priv->minor->device), 438 file_priv->authenticated); 439 440 if ((nr >= DRM_CORE_IOCTL_COUNT) && 441 ((nr < DRM_COMMAND_BASE) || (nr >= DRM_COMMAND_END))) 442 goto err_i1; 443 if ((nr >= DRM_COMMAND_BASE) && (nr < DRM_COMMAND_END) && 444 (nr < DRM_COMMAND_BASE + dev->driver->num_ioctls)) { 445 u32 drv_size; 446 ioctl = &dev->driver->ioctls[nr - DRM_COMMAND_BASE]; 447 drv_size = _IOC_SIZE(ioctl->cmd_drv); 448 usize = asize = _IOC_SIZE(cmd); 449 if (drv_size > asize) 450 asize = drv_size; 451 } 452 else if ((nr >= DRM_COMMAND_END) || (nr < DRM_COMMAND_BASE)) { 453 ioctl = &drm_ioctls[nr]; 454 cmd = ioctl->cmd; 455 usize = asize = _IOC_SIZE(cmd); 456 } else 457 goto err_i1; 458 459 /* Do not trust userspace, use our own definition */ 460 func = ioctl->func; 461 /* is there a local override? */ 462 if ((nr == DRM_IOCTL_NR(DRM_IOCTL_DMA)) && dev->driver->dma_ioctl) 463 func = dev->driver->dma_ioctl; 464 465 if (!func) { 466 DRM_DEBUG("no function\n"); 467 retcode = -EINVAL; 468 } else if (((ioctl->flags & DRM_ROOT_ONLY) && !capable(CAP_SYS_ADMIN)) || 469 ((ioctl->flags & DRM_AUTH) && !file_priv->authenticated) || 470 ((ioctl->flags & DRM_MASTER) && !file_priv->is_master) || 471 (!(ioctl->flags & DRM_CONTROL_ALLOW) && (file_priv->minor->type == DRM_MINOR_CONTROL))) { 472 retcode = -EACCES; 473 } else { 474 if (cmd & (IOC_IN | IOC_OUT)) { 475 if (asize <= sizeof(stack_kdata)) { 476 kdata = stack_kdata; 477 } else { 478 kdata = kmalloc(asize, GFP_KERNEL); 479 if (!kdata) { 480 retcode = -ENOMEM; 481 goto err_i1; 482 } 483 } 484 } 485 486 if (cmd & IOC_IN) { 487 if (copy_from_user(kdata, (void __user *)arg, 488 usize) != 0) { 489 retcode = -EFAULT; 490 goto err_i1; 491 } 492 } else 493 memset(kdata, 0, usize); 494 495 if (ioctl->flags & DRM_UNLOCKED) 496 retcode = func(dev, kdata, file_priv); 497 else { 498 mutex_lock(&drm_global_mutex); 499 retcode = func(dev, kdata, file_priv); 500 mutex_unlock(&drm_global_mutex); 501 } 502 503 if (cmd & IOC_OUT) { 504 if (copy_to_user((void __user *)arg, kdata, 505 usize) != 0) 506 retcode = -EFAULT; 507 } 508 } 509 510 err_i1: 511 if (kdata != stack_kdata) 512 kfree(kdata); 513 atomic_dec(&dev->ioctl_count); 514 if (retcode) 515 DRM_DEBUG("ret = %x\n", retcode); 516 return retcode; 517 } 518 519 EXPORT_SYMBOL(drm_ioctl); 520 521 struct drm_local_map *drm_getsarea(struct drm_device *dev) 522 { 523 struct drm_map_list *entry; 524 525 list_for_each_entry(entry, &dev->maplist, head) { 526 if (entry->map && entry->map->type == _DRM_SHM && 527 (entry->map->flags & _DRM_CONTAINS_LOCK)) { 528 return entry->map; 529 } 530 } 531 return NULL; 532 } 533 EXPORT_SYMBOL(drm_getsarea); 534