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 "drmP.h" 51 #include "drm_core.h" 52 53 54 static int drm_version(struct drm_device *dev, void *data, 55 struct drm_file *file_priv); 56 57 /** Ioctl table */ 58 static struct drm_ioctl_desc drm_ioctls[] = { 59 DRM_IOCTL_DEF(DRM_IOCTL_VERSION, drm_version, 0), 60 DRM_IOCTL_DEF(DRM_IOCTL_GET_UNIQUE, drm_getunique, 0), 61 DRM_IOCTL_DEF(DRM_IOCTL_GET_MAGIC, drm_getmagic, 0), 62 DRM_IOCTL_DEF(DRM_IOCTL_IRQ_BUSID, drm_irq_by_busid, DRM_MASTER|DRM_ROOT_ONLY), 63 DRM_IOCTL_DEF(DRM_IOCTL_GET_MAP, drm_getmap, 0), 64 DRM_IOCTL_DEF(DRM_IOCTL_GET_CLIENT, drm_getclient, 0), 65 DRM_IOCTL_DEF(DRM_IOCTL_GET_STATS, drm_getstats, 0), 66 DRM_IOCTL_DEF(DRM_IOCTL_SET_VERSION, drm_setversion, DRM_MASTER), 67 68 DRM_IOCTL_DEF(DRM_IOCTL_SET_UNIQUE, drm_setunique, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 69 DRM_IOCTL_DEF(DRM_IOCTL_BLOCK, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 70 DRM_IOCTL_DEF(DRM_IOCTL_UNBLOCK, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 71 DRM_IOCTL_DEF(DRM_IOCTL_AUTH_MAGIC, drm_authmagic, DRM_AUTH|DRM_MASTER), 72 73 DRM_IOCTL_DEF(DRM_IOCTL_ADD_MAP, drm_addmap_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 74 DRM_IOCTL_DEF(DRM_IOCTL_RM_MAP, drm_rmmap_ioctl, DRM_AUTH), 75 76 DRM_IOCTL_DEF(DRM_IOCTL_SET_SAREA_CTX, drm_setsareactx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 77 DRM_IOCTL_DEF(DRM_IOCTL_GET_SAREA_CTX, drm_getsareactx, DRM_AUTH), 78 79 DRM_IOCTL_DEF(DRM_IOCTL_SET_MASTER, drm_setmaster_ioctl, DRM_ROOT_ONLY), 80 DRM_IOCTL_DEF(DRM_IOCTL_DROP_MASTER, drm_dropmaster_ioctl, DRM_ROOT_ONLY), 81 82 DRM_IOCTL_DEF(DRM_IOCTL_ADD_CTX, drm_addctx, DRM_AUTH|DRM_ROOT_ONLY), 83 DRM_IOCTL_DEF(DRM_IOCTL_RM_CTX, drm_rmctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 84 DRM_IOCTL_DEF(DRM_IOCTL_MOD_CTX, drm_modctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 85 DRM_IOCTL_DEF(DRM_IOCTL_GET_CTX, drm_getctx, DRM_AUTH), 86 DRM_IOCTL_DEF(DRM_IOCTL_SWITCH_CTX, drm_switchctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 87 DRM_IOCTL_DEF(DRM_IOCTL_NEW_CTX, drm_newctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 88 DRM_IOCTL_DEF(DRM_IOCTL_RES_CTX, drm_resctx, DRM_AUTH), 89 90 DRM_IOCTL_DEF(DRM_IOCTL_ADD_DRAW, drm_adddraw, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 91 DRM_IOCTL_DEF(DRM_IOCTL_RM_DRAW, drm_rmdraw, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 92 93 DRM_IOCTL_DEF(DRM_IOCTL_LOCK, drm_lock, DRM_AUTH), 94 DRM_IOCTL_DEF(DRM_IOCTL_UNLOCK, drm_unlock, DRM_AUTH), 95 96 DRM_IOCTL_DEF(DRM_IOCTL_FINISH, drm_noop, DRM_AUTH), 97 98 DRM_IOCTL_DEF(DRM_IOCTL_ADD_BUFS, drm_addbufs, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 99 DRM_IOCTL_DEF(DRM_IOCTL_MARK_BUFS, drm_markbufs, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 100 DRM_IOCTL_DEF(DRM_IOCTL_INFO_BUFS, drm_infobufs, DRM_AUTH), 101 DRM_IOCTL_DEF(DRM_IOCTL_MAP_BUFS, drm_mapbufs, DRM_AUTH), 102 DRM_IOCTL_DEF(DRM_IOCTL_FREE_BUFS, drm_freebufs, DRM_AUTH), 103 /* The DRM_IOCTL_DMA ioctl should be defined by the driver. */ 104 DRM_IOCTL_DEF(DRM_IOCTL_DMA, NULL, DRM_AUTH), 105 106 DRM_IOCTL_DEF(DRM_IOCTL_CONTROL, drm_control, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 107 108 #if __OS_HAS_AGP 109 DRM_IOCTL_DEF(DRM_IOCTL_AGP_ACQUIRE, drm_agp_acquire_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 110 DRM_IOCTL_DEF(DRM_IOCTL_AGP_RELEASE, drm_agp_release_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 111 DRM_IOCTL_DEF(DRM_IOCTL_AGP_ENABLE, drm_agp_enable_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 112 DRM_IOCTL_DEF(DRM_IOCTL_AGP_INFO, drm_agp_info_ioctl, DRM_AUTH), 113 DRM_IOCTL_DEF(DRM_IOCTL_AGP_ALLOC, drm_agp_alloc_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 114 DRM_IOCTL_DEF(DRM_IOCTL_AGP_FREE, drm_agp_free_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 115 DRM_IOCTL_DEF(DRM_IOCTL_AGP_BIND, drm_agp_bind_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 116 DRM_IOCTL_DEF(DRM_IOCTL_AGP_UNBIND, drm_agp_unbind_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 117 #endif 118 119 DRM_IOCTL_DEF(DRM_IOCTL_SG_ALLOC, drm_sg_alloc_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 120 DRM_IOCTL_DEF(DRM_IOCTL_SG_FREE, drm_sg_free, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 121 122 DRM_IOCTL_DEF(DRM_IOCTL_WAIT_VBLANK, drm_wait_vblank, 0), 123 124 DRM_IOCTL_DEF(DRM_IOCTL_MODESET_CTL, drm_modeset_ctl, 0), 125 126 DRM_IOCTL_DEF(DRM_IOCTL_UPDATE_DRAW, drm_update_drawable_info, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 127 128 DRM_IOCTL_DEF(DRM_IOCTL_GEM_CLOSE, drm_gem_close_ioctl, 0), 129 DRM_IOCTL_DEF(DRM_IOCTL_GEM_FLINK, drm_gem_flink_ioctl, DRM_AUTH), 130 DRM_IOCTL_DEF(DRM_IOCTL_GEM_OPEN, drm_gem_open_ioctl, DRM_AUTH), 131 132 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETRESOURCES, drm_mode_getresources, DRM_MASTER|DRM_CONTROL_ALLOW), 133 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETCRTC, drm_mode_getcrtc, DRM_MASTER|DRM_CONTROL_ALLOW), 134 DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETCRTC, drm_mode_setcrtc, DRM_MASTER|DRM_CONTROL_ALLOW), 135 DRM_IOCTL_DEF(DRM_IOCTL_MODE_CURSOR, drm_mode_cursor_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW), 136 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETGAMMA, drm_mode_gamma_get_ioctl, DRM_MASTER), 137 DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETGAMMA, drm_mode_gamma_set_ioctl, DRM_MASTER), 138 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETENCODER, drm_mode_getencoder, DRM_MASTER|DRM_CONTROL_ALLOW), 139 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETCONNECTOR, drm_mode_getconnector, DRM_MASTER|DRM_CONTROL_ALLOW), 140 DRM_IOCTL_DEF(DRM_IOCTL_MODE_ATTACHMODE, drm_mode_attachmode_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW), 141 DRM_IOCTL_DEF(DRM_IOCTL_MODE_DETACHMODE, drm_mode_detachmode_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW), 142 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPROPERTY, drm_mode_getproperty_ioctl, DRM_MASTER | DRM_CONTROL_ALLOW), 143 DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETPROPERTY, drm_mode_connector_property_set_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW), 144 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPROPBLOB, drm_mode_getblob_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW), 145 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETFB, drm_mode_getfb, DRM_MASTER|DRM_CONTROL_ALLOW), 146 DRM_IOCTL_DEF(DRM_IOCTL_MODE_ADDFB, drm_mode_addfb, DRM_MASTER|DRM_CONTROL_ALLOW), 147 DRM_IOCTL_DEF(DRM_IOCTL_MODE_RMFB, drm_mode_rmfb, DRM_MASTER|DRM_CONTROL_ALLOW), 148 DRM_IOCTL_DEF(DRM_IOCTL_MODE_PAGE_FLIP, drm_mode_page_flip_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW), 149 DRM_IOCTL_DEF(DRM_IOCTL_MODE_DIRTYFB, drm_mode_dirtyfb_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW) 150 }; 151 152 #define DRM_CORE_IOCTL_COUNT ARRAY_SIZE( drm_ioctls ) 153 154 /** 155 * Take down the DRM device. 156 * 157 * \param dev DRM device structure. 158 * 159 * Frees every resource in \p dev. 160 * 161 * \sa drm_device 162 */ 163 int drm_lastclose(struct drm_device * dev) 164 { 165 struct drm_vma_entry *vma, *vma_temp; 166 int i; 167 168 DRM_DEBUG("\n"); 169 170 if (dev->driver->lastclose) 171 dev->driver->lastclose(dev); 172 DRM_DEBUG("driver lastclose completed\n"); 173 174 if (dev->irq_enabled && !drm_core_check_feature(dev, DRIVER_MODESET)) 175 drm_irq_uninstall(dev); 176 177 mutex_lock(&dev->struct_mutex); 178 179 /* Free drawable information memory */ 180 drm_drawable_free_all(dev); 181 del_timer(&dev->timer); 182 183 /* Clear AGP information */ 184 if (drm_core_has_AGP(dev) && dev->agp && 185 !drm_core_check_feature(dev, DRIVER_MODESET)) { 186 struct drm_agp_mem *entry, *tempe; 187 188 /* Remove AGP resources, but leave dev->agp 189 intact until drv_cleanup is called. */ 190 list_for_each_entry_safe(entry, tempe, &dev->agp->memory, head) { 191 if (entry->bound) 192 drm_unbind_agp(entry->memory); 193 drm_free_agp(entry->memory, entry->pages); 194 kfree(entry); 195 } 196 INIT_LIST_HEAD(&dev->agp->memory); 197 198 if (dev->agp->acquired) 199 drm_agp_release(dev); 200 201 dev->agp->acquired = 0; 202 dev->agp->enabled = 0; 203 } 204 if (drm_core_check_feature(dev, DRIVER_SG) && dev->sg && 205 !drm_core_check_feature(dev, DRIVER_MODESET)) { 206 drm_sg_cleanup(dev->sg); 207 dev->sg = NULL; 208 } 209 210 /* Clear vma list (only built for debugging) */ 211 list_for_each_entry_safe(vma, vma_temp, &dev->vmalist, head) { 212 list_del(&vma->head); 213 kfree(vma); 214 } 215 216 if (drm_core_check_feature(dev, DRIVER_DMA_QUEUE) && dev->queuelist) { 217 for (i = 0; i < dev->queue_count; i++) { 218 kfree(dev->queuelist[i]); 219 dev->queuelist[i] = NULL; 220 } 221 kfree(dev->queuelist); 222 dev->queuelist = NULL; 223 } 224 dev->queue_count = 0; 225 226 if (drm_core_check_feature(dev, DRIVER_HAVE_DMA) && 227 !drm_core_check_feature(dev, DRIVER_MODESET)) 228 drm_dma_takedown(dev); 229 230 dev->dev_mapping = NULL; 231 mutex_unlock(&dev->struct_mutex); 232 233 DRM_DEBUG("lastclose completed\n"); 234 return 0; 235 } 236 237 /** 238 * Module initialization. Called via init_module at module load time, or via 239 * linux/init/main.c (this is not currently supported). 240 * 241 * \return zero on success or a negative number on failure. 242 * 243 * Initializes an array of drm_device structures, and attempts to 244 * initialize all available devices, using consecutive minors, registering the 245 * stubs and initializing the AGP device. 246 * 247 * Expands the \c DRIVER_PREINIT and \c DRIVER_POST_INIT macros before and 248 * after the initialization for driver customization. 249 */ 250 int drm_init(struct drm_driver *driver) 251 { 252 struct pci_dev *pdev = NULL; 253 const struct pci_device_id *pid; 254 int i; 255 256 DRM_DEBUG("\n"); 257 258 INIT_LIST_HEAD(&driver->device_list); 259 260 if (driver->driver_features & DRIVER_MODESET) 261 return pci_register_driver(&driver->pci_driver); 262 263 /* If not using KMS, fall back to stealth mode manual scanning. */ 264 for (i = 0; driver->pci_driver.id_table[i].vendor != 0; i++) { 265 pid = &driver->pci_driver.id_table[i]; 266 267 /* Loop around setting up a DRM device for each PCI device 268 * matching our ID and device class. If we had the internal 269 * function that pci_get_subsys and pci_get_class used, we'd 270 * be able to just pass pid in instead of doing a two-stage 271 * thing. 272 */ 273 pdev = NULL; 274 while ((pdev = 275 pci_get_subsys(pid->vendor, pid->device, pid->subvendor, 276 pid->subdevice, pdev)) != NULL) { 277 if ((pdev->class & pid->class_mask) != pid->class) 278 continue; 279 280 /* stealth mode requires a manual probe */ 281 pci_dev_get(pdev); 282 drm_get_dev(pdev, pid, driver); 283 } 284 } 285 return 0; 286 } 287 288 EXPORT_SYMBOL(drm_init); 289 290 void drm_exit(struct drm_driver *driver) 291 { 292 struct drm_device *dev, *tmp; 293 DRM_DEBUG("\n"); 294 295 if (driver->driver_features & DRIVER_MODESET) { 296 pci_unregister_driver(&driver->pci_driver); 297 } else { 298 list_for_each_entry_safe(dev, tmp, &driver->device_list, driver_item) 299 drm_put_dev(dev); 300 } 301 302 DRM_INFO("Module unloaded\n"); 303 } 304 305 EXPORT_SYMBOL(drm_exit); 306 307 /** File operations structure */ 308 static const struct file_operations drm_stub_fops = { 309 .owner = THIS_MODULE, 310 .open = drm_stub_open 311 }; 312 313 static int __init drm_core_init(void) 314 { 315 int ret = -ENOMEM; 316 317 idr_init(&drm_minors_idr); 318 319 if (register_chrdev(DRM_MAJOR, "drm", &drm_stub_fops)) 320 goto err_p1; 321 322 drm_class = drm_sysfs_create(THIS_MODULE, "drm"); 323 if (IS_ERR(drm_class)) { 324 printk(KERN_ERR "DRM: Error creating drm class.\n"); 325 ret = PTR_ERR(drm_class); 326 goto err_p2; 327 } 328 329 drm_proc_root = proc_mkdir("dri", NULL); 330 if (!drm_proc_root) { 331 DRM_ERROR("Cannot create /proc/dri\n"); 332 ret = -1; 333 goto err_p3; 334 } 335 336 drm_debugfs_root = debugfs_create_dir("dri", NULL); 337 if (!drm_debugfs_root) { 338 DRM_ERROR("Cannot create /sys/kernel/debug/dri\n"); 339 ret = -1; 340 goto err_p3; 341 } 342 343 DRM_INFO("Initialized %s %d.%d.%d %s\n", 344 CORE_NAME, CORE_MAJOR, CORE_MINOR, CORE_PATCHLEVEL, CORE_DATE); 345 return 0; 346 err_p3: 347 drm_sysfs_destroy(); 348 err_p2: 349 unregister_chrdev(DRM_MAJOR, "drm"); 350 351 idr_destroy(&drm_minors_idr); 352 err_p1: 353 return ret; 354 } 355 356 static void __exit drm_core_exit(void) 357 { 358 remove_proc_entry("dri", NULL); 359 debugfs_remove(drm_debugfs_root); 360 drm_sysfs_destroy(); 361 362 unregister_chrdev(DRM_MAJOR, "drm"); 363 364 idr_destroy(&drm_minors_idr); 365 } 366 367 module_init(drm_core_init); 368 module_exit(drm_core_exit); 369 370 /** 371 * Copy and IOCTL return string to user space 372 */ 373 static int drm_copy_field(char *buf, size_t *buf_len, const char *value) 374 { 375 int len; 376 377 /* don't overflow userbuf */ 378 len = strlen(value); 379 if (len > *buf_len) 380 len = *buf_len; 381 382 /* let userspace know exact length of driver value (which could be 383 * larger than the userspace-supplied buffer) */ 384 *buf_len = strlen(value); 385 386 /* finally, try filling in the userbuf */ 387 if (len && buf) 388 if (copy_to_user(buf, value, len)) 389 return -EFAULT; 390 return 0; 391 } 392 393 /** 394 * Get version information 395 * 396 * \param inode device inode. 397 * \param filp file pointer. 398 * \param cmd command. 399 * \param arg user argument, pointing to a drm_version structure. 400 * \return zero on success or negative number on failure. 401 * 402 * Fills in the version information in \p arg. 403 */ 404 static int drm_version(struct drm_device *dev, void *data, 405 struct drm_file *file_priv) 406 { 407 struct drm_version *version = data; 408 int err; 409 410 version->version_major = dev->driver->major; 411 version->version_minor = dev->driver->minor; 412 version->version_patchlevel = dev->driver->patchlevel; 413 err = drm_copy_field(version->name, &version->name_len, 414 dev->driver->name); 415 if (!err) 416 err = drm_copy_field(version->date, &version->date_len, 417 dev->driver->date); 418 if (!err) 419 err = drm_copy_field(version->desc, &version->desc_len, 420 dev->driver->desc); 421 422 return err; 423 } 424 425 /** 426 * Called whenever a process performs an ioctl on /dev/drm. 427 * 428 * \param inode device inode. 429 * \param file_priv DRM file private. 430 * \param cmd command. 431 * \param arg user argument. 432 * \return zero on success or negative number on failure. 433 * 434 * Looks up the ioctl function in the ::ioctls table, checking for root 435 * previleges if so required, and dispatches to the respective function. 436 */ 437 int drm_ioctl(struct inode *inode, struct file *filp, 438 unsigned int cmd, unsigned long arg) 439 { 440 struct drm_file *file_priv = filp->private_data; 441 struct drm_device *dev = file_priv->minor->dev; 442 struct drm_ioctl_desc *ioctl; 443 drm_ioctl_t *func; 444 unsigned int nr = DRM_IOCTL_NR(cmd); 445 int retcode = -EINVAL; 446 char stack_kdata[128]; 447 char *kdata = NULL; 448 449 atomic_inc(&dev->ioctl_count); 450 atomic_inc(&dev->counts[_DRM_STAT_IOCTLS]); 451 ++file_priv->ioctl_count; 452 453 DRM_DEBUG("pid=%d, cmd=0x%02x, nr=0x%02x, dev 0x%lx, auth=%d\n", 454 task_pid_nr(current), cmd, nr, 455 (long)old_encode_dev(file_priv->minor->device), 456 file_priv->authenticated); 457 458 if ((nr >= DRM_CORE_IOCTL_COUNT) && 459 ((nr < DRM_COMMAND_BASE) || (nr >= DRM_COMMAND_END))) 460 goto err_i1; 461 if ((nr >= DRM_COMMAND_BASE) && (nr < DRM_COMMAND_END) && 462 (nr < DRM_COMMAND_BASE + dev->driver->num_ioctls)) 463 ioctl = &dev->driver->ioctls[nr - DRM_COMMAND_BASE]; 464 else if ((nr >= DRM_COMMAND_END) || (nr < DRM_COMMAND_BASE)) { 465 ioctl = &drm_ioctls[nr]; 466 cmd = ioctl->cmd; 467 } else 468 goto err_i1; 469 470 /* Do not trust userspace, use our own definition */ 471 func = ioctl->func; 472 /* is there a local override? */ 473 if ((nr == DRM_IOCTL_NR(DRM_IOCTL_DMA)) && dev->driver->dma_ioctl) 474 func = dev->driver->dma_ioctl; 475 476 if (!func) { 477 DRM_DEBUG("no function\n"); 478 retcode = -EINVAL; 479 } else if (((ioctl->flags & DRM_ROOT_ONLY) && !capable(CAP_SYS_ADMIN)) || 480 ((ioctl->flags & DRM_AUTH) && !file_priv->authenticated) || 481 ((ioctl->flags & DRM_MASTER) && !file_priv->is_master) || 482 (!(ioctl->flags & DRM_CONTROL_ALLOW) && (file_priv->minor->type == DRM_MINOR_CONTROL))) { 483 retcode = -EACCES; 484 } else { 485 if (cmd & (IOC_IN | IOC_OUT)) { 486 if (_IOC_SIZE(cmd) <= sizeof(stack_kdata)) { 487 kdata = stack_kdata; 488 } else { 489 kdata = kmalloc(_IOC_SIZE(cmd), GFP_KERNEL); 490 if (!kdata) { 491 retcode = -ENOMEM; 492 goto err_i1; 493 } 494 } 495 } 496 497 if (cmd & IOC_IN) { 498 if (copy_from_user(kdata, (void __user *)arg, 499 _IOC_SIZE(cmd)) != 0) { 500 retcode = -EFAULT; 501 goto err_i1; 502 } 503 } 504 retcode = func(dev, kdata, file_priv); 505 506 if (cmd & IOC_OUT) { 507 if (copy_to_user((void __user *)arg, kdata, 508 _IOC_SIZE(cmd)) != 0) 509 retcode = -EFAULT; 510 } 511 } 512 513 err_i1: 514 if (kdata != stack_kdata) 515 kfree(kdata); 516 atomic_dec(&dev->ioctl_count); 517 if (retcode) 518 DRM_DEBUG("ret = %x\n", retcode); 519 return retcode; 520 } 521 522 EXPORT_SYMBOL(drm_ioctl); 523 524 struct drm_local_map *drm_getsarea(struct drm_device *dev) 525 { 526 struct drm_map_list *entry; 527 528 list_for_each_entry(entry, &dev->maplist, head) { 529 if (entry->map && entry->map->type == _DRM_SHM && 530 (entry->map->flags & _DRM_CONTAINS_LOCK)) { 531 return entry->map; 532 } 533 } 534 return NULL; 535 } 536 EXPORT_SYMBOL(drm_getsarea); 537