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 }; 149 150 #define DRM_CORE_IOCTL_COUNT ARRAY_SIZE( drm_ioctls ) 151 152 /** 153 * Take down the DRM device. 154 * 155 * \param dev DRM device structure. 156 * 157 * Frees every resource in \p dev. 158 * 159 * \sa drm_device 160 */ 161 int drm_lastclose(struct drm_device * dev) 162 { 163 struct drm_vma_entry *vma, *vma_temp; 164 int i; 165 166 DRM_DEBUG("\n"); 167 168 if (dev->driver->lastclose) 169 dev->driver->lastclose(dev); 170 DRM_DEBUG("driver lastclose completed\n"); 171 172 if (dev->irq_enabled && !drm_core_check_feature(dev, DRIVER_MODESET)) 173 drm_irq_uninstall(dev); 174 175 mutex_lock(&dev->struct_mutex); 176 177 /* Free drawable information memory */ 178 drm_drawable_free_all(dev); 179 del_timer(&dev->timer); 180 181 /* Clear AGP information */ 182 if (drm_core_has_AGP(dev) && dev->agp && 183 !drm_core_check_feature(dev, DRIVER_MODESET)) { 184 struct drm_agp_mem *entry, *tempe; 185 186 /* Remove AGP resources, but leave dev->agp 187 intact until drv_cleanup is called. */ 188 list_for_each_entry_safe(entry, tempe, &dev->agp->memory, head) { 189 if (entry->bound) 190 drm_unbind_agp(entry->memory); 191 drm_free_agp(entry->memory, entry->pages); 192 kfree(entry); 193 } 194 INIT_LIST_HEAD(&dev->agp->memory); 195 196 if (dev->agp->acquired) 197 drm_agp_release(dev); 198 199 dev->agp->acquired = 0; 200 dev->agp->enabled = 0; 201 } 202 if (drm_core_check_feature(dev, DRIVER_SG) && dev->sg && 203 !drm_core_check_feature(dev, DRIVER_MODESET)) { 204 drm_sg_cleanup(dev->sg); 205 dev->sg = NULL; 206 } 207 208 /* Clear vma list (only built for debugging) */ 209 list_for_each_entry_safe(vma, vma_temp, &dev->vmalist, head) { 210 list_del(&vma->head); 211 kfree(vma); 212 } 213 214 if (drm_core_check_feature(dev, DRIVER_DMA_QUEUE) && dev->queuelist) { 215 for (i = 0; i < dev->queue_count; i++) { 216 kfree(dev->queuelist[i]); 217 dev->queuelist[i] = NULL; 218 } 219 kfree(dev->queuelist); 220 dev->queuelist = NULL; 221 } 222 dev->queue_count = 0; 223 224 if (drm_core_check_feature(dev, DRIVER_HAVE_DMA) && 225 !drm_core_check_feature(dev, DRIVER_MODESET)) 226 drm_dma_takedown(dev); 227 228 dev->dev_mapping = NULL; 229 mutex_unlock(&dev->struct_mutex); 230 231 DRM_DEBUG("lastclose completed\n"); 232 return 0; 233 } 234 235 /** 236 * Module initialization. Called via init_module at module load time, or via 237 * linux/init/main.c (this is not currently supported). 238 * 239 * \return zero on success or a negative number on failure. 240 * 241 * Initializes an array of drm_device structures, and attempts to 242 * initialize all available devices, using consecutive minors, registering the 243 * stubs and initializing the AGP device. 244 * 245 * Expands the \c DRIVER_PREINIT and \c DRIVER_POST_INIT macros before and 246 * after the initialization for driver customization. 247 */ 248 int drm_init(struct drm_driver *driver) 249 { 250 struct pci_dev *pdev = NULL; 251 const struct pci_device_id *pid; 252 int i; 253 254 DRM_DEBUG("\n"); 255 256 INIT_LIST_HEAD(&driver->device_list); 257 258 if (driver->driver_features & DRIVER_MODESET) 259 return pci_register_driver(&driver->pci_driver); 260 261 /* If not using KMS, fall back to stealth mode manual scanning. */ 262 for (i = 0; driver->pci_driver.id_table[i].vendor != 0; i++) { 263 pid = &driver->pci_driver.id_table[i]; 264 265 /* Loop around setting up a DRM device for each PCI device 266 * matching our ID and device class. If we had the internal 267 * function that pci_get_subsys and pci_get_class used, we'd 268 * be able to just pass pid in instead of doing a two-stage 269 * thing. 270 */ 271 pdev = NULL; 272 while ((pdev = 273 pci_get_subsys(pid->vendor, pid->device, pid->subvendor, 274 pid->subdevice, pdev)) != NULL) { 275 if ((pdev->class & pid->class_mask) != pid->class) 276 continue; 277 278 /* stealth mode requires a manual probe */ 279 pci_dev_get(pdev); 280 drm_get_dev(pdev, pid, driver); 281 } 282 } 283 return 0; 284 } 285 286 EXPORT_SYMBOL(drm_init); 287 288 void drm_exit(struct drm_driver *driver) 289 { 290 struct drm_device *dev, *tmp; 291 DRM_DEBUG("\n"); 292 293 if (driver->driver_features & DRIVER_MODESET) { 294 pci_unregister_driver(&driver->pci_driver); 295 } else { 296 list_for_each_entry_safe(dev, tmp, &driver->device_list, driver_item) 297 drm_put_dev(dev); 298 } 299 300 DRM_INFO("Module unloaded\n"); 301 } 302 303 EXPORT_SYMBOL(drm_exit); 304 305 /** File operations structure */ 306 static const struct file_operations drm_stub_fops = { 307 .owner = THIS_MODULE, 308 .open = drm_stub_open 309 }; 310 311 static int __init drm_core_init(void) 312 { 313 int ret = -ENOMEM; 314 315 idr_init(&drm_minors_idr); 316 317 if (register_chrdev(DRM_MAJOR, "drm", &drm_stub_fops)) 318 goto err_p1; 319 320 drm_class = drm_sysfs_create(THIS_MODULE, "drm"); 321 if (IS_ERR(drm_class)) { 322 printk(KERN_ERR "DRM: Error creating drm class.\n"); 323 ret = PTR_ERR(drm_class); 324 goto err_p2; 325 } 326 327 drm_proc_root = proc_mkdir("dri", NULL); 328 if (!drm_proc_root) { 329 DRM_ERROR("Cannot create /proc/dri\n"); 330 ret = -1; 331 goto err_p3; 332 } 333 334 drm_debugfs_root = debugfs_create_dir("dri", NULL); 335 if (!drm_debugfs_root) { 336 DRM_ERROR("Cannot create /sys/kernel/debug/dri\n"); 337 ret = -1; 338 goto err_p3; 339 } 340 341 DRM_INFO("Initialized %s %d.%d.%d %s\n", 342 CORE_NAME, CORE_MAJOR, CORE_MINOR, CORE_PATCHLEVEL, CORE_DATE); 343 return 0; 344 err_p3: 345 drm_sysfs_destroy(); 346 err_p2: 347 unregister_chrdev(DRM_MAJOR, "drm"); 348 349 idr_destroy(&drm_minors_idr); 350 err_p1: 351 return ret; 352 } 353 354 static void __exit drm_core_exit(void) 355 { 356 remove_proc_entry("dri", NULL); 357 debugfs_remove(drm_debugfs_root); 358 drm_sysfs_destroy(); 359 360 unregister_chrdev(DRM_MAJOR, "drm"); 361 362 idr_destroy(&drm_minors_idr); 363 } 364 365 module_init(drm_core_init); 366 module_exit(drm_core_exit); 367 368 /** 369 * Get version information 370 * 371 * \param inode device inode. 372 * \param filp file pointer. 373 * \param cmd command. 374 * \param arg user argument, pointing to a drm_version structure. 375 * \return zero on success or negative number on failure. 376 * 377 * Fills in the version information in \p arg. 378 */ 379 static int drm_version(struct drm_device *dev, void *data, 380 struct drm_file *file_priv) 381 { 382 struct drm_version *version = data; 383 int len; 384 385 version->version_major = dev->driver->major; 386 version->version_minor = dev->driver->minor; 387 version->version_patchlevel = dev->driver->patchlevel; 388 DRM_COPY(version->name, dev->driver->name); 389 DRM_COPY(version->date, dev->driver->date); 390 DRM_COPY(version->desc, dev->driver->desc); 391 392 return 0; 393 } 394 395 /** 396 * Called whenever a process performs an ioctl on /dev/drm. 397 * 398 * \param inode device inode. 399 * \param file_priv DRM file private. 400 * \param cmd command. 401 * \param arg user argument. 402 * \return zero on success or negative number on failure. 403 * 404 * Looks up the ioctl function in the ::ioctls table, checking for root 405 * previleges if so required, and dispatches to the respective function. 406 */ 407 int drm_ioctl(struct inode *inode, struct file *filp, 408 unsigned int cmd, unsigned long arg) 409 { 410 struct drm_file *file_priv = filp->private_data; 411 struct drm_device *dev = file_priv->minor->dev; 412 struct drm_ioctl_desc *ioctl; 413 drm_ioctl_t *func; 414 unsigned int nr = DRM_IOCTL_NR(cmd); 415 int retcode = -EINVAL; 416 char stack_kdata[128]; 417 char *kdata = NULL; 418 419 atomic_inc(&dev->ioctl_count); 420 atomic_inc(&dev->counts[_DRM_STAT_IOCTLS]); 421 ++file_priv->ioctl_count; 422 423 DRM_DEBUG("pid=%d, cmd=0x%02x, nr=0x%02x, dev 0x%lx, auth=%d\n", 424 task_pid_nr(current), cmd, nr, 425 (long)old_encode_dev(file_priv->minor->device), 426 file_priv->authenticated); 427 428 if ((nr >= DRM_CORE_IOCTL_COUNT) && 429 ((nr < DRM_COMMAND_BASE) || (nr >= DRM_COMMAND_END))) 430 goto err_i1; 431 if ((nr >= DRM_COMMAND_BASE) && (nr < DRM_COMMAND_END) && 432 (nr < DRM_COMMAND_BASE + dev->driver->num_ioctls)) 433 ioctl = &dev->driver->ioctls[nr - DRM_COMMAND_BASE]; 434 else if ((nr >= DRM_COMMAND_END) || (nr < DRM_COMMAND_BASE)) { 435 ioctl = &drm_ioctls[nr]; 436 cmd = ioctl->cmd; 437 } else 438 goto err_i1; 439 440 /* Do not trust userspace, use our own definition */ 441 func = ioctl->func; 442 /* is there a local override? */ 443 if ((nr == DRM_IOCTL_NR(DRM_IOCTL_DMA)) && dev->driver->dma_ioctl) 444 func = dev->driver->dma_ioctl; 445 446 if (!func) { 447 DRM_DEBUG("no function\n"); 448 retcode = -EINVAL; 449 } else if (((ioctl->flags & DRM_ROOT_ONLY) && !capable(CAP_SYS_ADMIN)) || 450 ((ioctl->flags & DRM_AUTH) && !file_priv->authenticated) || 451 ((ioctl->flags & DRM_MASTER) && !file_priv->is_master) || 452 (!(ioctl->flags & DRM_CONTROL_ALLOW) && (file_priv->minor->type == DRM_MINOR_CONTROL))) { 453 retcode = -EACCES; 454 } else { 455 if (cmd & (IOC_IN | IOC_OUT)) { 456 if (_IOC_SIZE(cmd) <= sizeof(stack_kdata)) { 457 kdata = stack_kdata; 458 } else { 459 kdata = kmalloc(_IOC_SIZE(cmd), GFP_KERNEL); 460 if (!kdata) { 461 retcode = -ENOMEM; 462 goto err_i1; 463 } 464 } 465 } 466 467 if (cmd & IOC_IN) { 468 if (copy_from_user(kdata, (void __user *)arg, 469 _IOC_SIZE(cmd)) != 0) { 470 retcode = -EFAULT; 471 goto err_i1; 472 } 473 } 474 retcode = func(dev, kdata, file_priv); 475 476 if (cmd & IOC_OUT) { 477 if (copy_to_user((void __user *)arg, kdata, 478 _IOC_SIZE(cmd)) != 0) 479 retcode = -EFAULT; 480 } 481 } 482 483 err_i1: 484 if (kdata != stack_kdata) 485 kfree(kdata); 486 atomic_dec(&dev->ioctl_count); 487 if (retcode) 488 DRM_DEBUG("ret = %x\n", retcode); 489 return retcode; 490 } 491 492 EXPORT_SYMBOL(drm_ioctl); 493 494 struct drm_local_map *drm_getsarea(struct drm_device *dev) 495 { 496 struct drm_map_list *entry; 497 498 list_for_each_entry(entry, &dev->maplist, head) { 499 if (entry->map && entry->map->type == _DRM_SHM && 500 (entry->map->flags & _DRM_CONTAINS_LOCK)) { 501 return entry->map; 502 } 503 } 504 return NULL; 505 } 506 EXPORT_SYMBOL(drm_getsarea); 507