drivers/gpu/drm/drm_drv.c

   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 "drmP.h"
  50 #include "drm_core.h"
  51
  52 static int drm_version(struct drm_device *dev, void *data,
  53                        struct drm_file *file_priv);
  54
  55 /** Ioctl table */
  56 static struct drm_ioctl_desc drm_ioctls[] = {
  57         DRM_IOCTL_DEF(DRM_IOCTL_VERSION, drm_version, 0),
  58         DRM_IOCTL_DEF(DRM_IOCTL_GET_UNIQUE, drm_getunique, 0),
  59         DRM_IOCTL_DEF(DRM_IOCTL_GET_MAGIC, drm_getmagic, 0),
  60         DRM_IOCTL_DEF(DRM_IOCTL_IRQ_BUSID, drm_irq_by_busid, DRM_MASTER|DRM_ROOT_ONLY),
  61         DRM_IOCTL_DEF(DRM_IOCTL_GET_MAP, drm_getmap, 0),
  62         DRM_IOCTL_DEF(DRM_IOCTL_GET_CLIENT, drm_getclient, 0),
  63         DRM_IOCTL_DEF(DRM_IOCTL_GET_STATS, drm_getstats, 0),
  64         DRM_IOCTL_DEF(DRM_IOCTL_SET_VERSION, drm_setversion, DRM_MASTER|DRM_ROOT_ONLY),
  65
  66         DRM_IOCTL_DEF(DRM_IOCTL_SET_UNIQUE, drm_setunique, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
  67         DRM_IOCTL_DEF(DRM_IOCTL_BLOCK, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
  68         DRM_IOCTL_DEF(DRM_IOCTL_UNBLOCK, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
  69         DRM_IOCTL_DEF(DRM_IOCTL_AUTH_MAGIC, drm_authmagic, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
  70
  71         DRM_IOCTL_DEF(DRM_IOCTL_ADD_MAP, drm_addmap_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
  72         DRM_IOCTL_DEF(DRM_IOCTL_RM_MAP, drm_rmmap_ioctl, DRM_AUTH),
  73
  74         DRM_IOCTL_DEF(DRM_IOCTL_SET_SAREA_CTX, drm_setsareactx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
  75         DRM_IOCTL_DEF(DRM_IOCTL_GET_SAREA_CTX, drm_getsareactx, DRM_AUTH),
  76
  77         DRM_IOCTL_DEF(DRM_IOCTL_ADD_CTX, drm_addctx, DRM_AUTH|DRM_ROOT_ONLY),
  78         DRM_IOCTL_DEF(DRM_IOCTL_RM_CTX, drm_rmctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
  79         DRM_IOCTL_DEF(DRM_IOCTL_MOD_CTX, drm_modctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
  80         DRM_IOCTL_DEF(DRM_IOCTL_GET_CTX, drm_getctx, DRM_AUTH),
  81         DRM_IOCTL_DEF(DRM_IOCTL_SWITCH_CTX, drm_switchctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
  82         DRM_IOCTL_DEF(DRM_IOCTL_NEW_CTX, drm_newctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
  83         DRM_IOCTL_DEF(DRM_IOCTL_RES_CTX, drm_resctx, DRM_AUTH),
  84
  85         DRM_IOCTL_DEF(DRM_IOCTL_ADD_DRAW, drm_adddraw, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
  86         DRM_IOCTL_DEF(DRM_IOCTL_RM_DRAW, drm_rmdraw, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
  87
  88         DRM_IOCTL_DEF(DRM_IOCTL_LOCK, drm_lock, DRM_AUTH),
  89         DRM_IOCTL_DEF(DRM_IOCTL_UNLOCK, drm_unlock, DRM_AUTH),
  90
  91         DRM_IOCTL_DEF(DRM_IOCTL_FINISH, drm_noop, DRM_AUTH),
  92
  93         DRM_IOCTL_DEF(DRM_IOCTL_ADD_BUFS, drm_addbufs, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
  94         DRM_IOCTL_DEF(DRM_IOCTL_MARK_BUFS, drm_markbufs, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
  95         DRM_IOCTL_DEF(DRM_IOCTL_INFO_BUFS, drm_infobufs, DRM_AUTH),
  96         DRM_IOCTL_DEF(DRM_IOCTL_MAP_BUFS, drm_mapbufs, DRM_AUTH),
  97         DRM_IOCTL_DEF(DRM_IOCTL_FREE_BUFS, drm_freebufs, DRM_AUTH),
  98         /* The DRM_IOCTL_DMA ioctl should be defined by the driver. */
  99         DRM_IOCTL_DEF(DRM_IOCTL_DMA, NULL, DRM_AUTH),
 100
 101         DRM_IOCTL_DEF(DRM_IOCTL_CONTROL, drm_control, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
 102
 103 #if __OS_HAS_AGP
 104         DRM_IOCTL_DEF(DRM_IOCTL_AGP_ACQUIRE, drm_agp_acquire_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
 105         DRM_IOCTL_DEF(DRM_IOCTL_AGP_RELEASE, drm_agp_release_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
 106         DRM_IOCTL_DEF(DRM_IOCTL_AGP_ENABLE, drm_agp_enable_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
 107         DRM_IOCTL_DEF(DRM_IOCTL_AGP_INFO, drm_agp_info_ioctl, DRM_AUTH),
 108         DRM_IOCTL_DEF(DRM_IOCTL_AGP_ALLOC, drm_agp_alloc_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
 109         DRM_IOCTL_DEF(DRM_IOCTL_AGP_FREE, drm_agp_free_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
 110         DRM_IOCTL_DEF(DRM_IOCTL_AGP_BIND, drm_agp_bind_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
 111         DRM_IOCTL_DEF(DRM_IOCTL_AGP_UNBIND, drm_agp_unbind_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
 112 #endif
 113
 114         DRM_IOCTL_DEF(DRM_IOCTL_SG_ALLOC, drm_sg_alloc_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
 115         DRM_IOCTL_DEF(DRM_IOCTL_SG_FREE, drm_sg_free, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
 116
 117         DRM_IOCTL_DEF(DRM_IOCTL_WAIT_VBLANK, drm_wait_vblank, 0),
 118
 119         DRM_IOCTL_DEF(DRM_IOCTL_MODESET_CTL, drm_modeset_ctl, 0),
 120
 121         DRM_IOCTL_DEF(DRM_IOCTL_UPDATE_DRAW, drm_update_drawable_info, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
 122
 123         DRM_IOCTL_DEF(DRM_IOCTL_GEM_CLOSE, drm_gem_close_ioctl, 0),
 124         DRM_IOCTL_DEF(DRM_IOCTL_GEM_FLINK, drm_gem_flink_ioctl, DRM_AUTH),
 125         DRM_IOCTL_DEF(DRM_IOCTL_GEM_OPEN, drm_gem_open_ioctl, DRM_AUTH),
 126 };
 127
 128 #define DRM_CORE_IOCTL_COUNT    ARRAY_SIZE( drm_ioctls )
 129
 130 /**
 131  * Take down the DRM device.
 132  *
 133  * \param dev DRM device structure.
 134  *
 135  * Frees every resource in \p dev.
 136  *
 137  * \sa drm_device
 138  */
 139 int drm_lastclose(struct drm_device * dev)
 140 {
 141         struct drm_magic_entry *pt, *next;
 142         struct drm_map_list *r_list, *list_t;
 143         struct drm_vma_entry *vma, *vma_temp;
 144         int i;
 145
 146         DRM_DEBUG("\n");
 147
 148         if (dev->driver->lastclose)
 149                 dev->driver->lastclose(dev);
 150         DRM_DEBUG("driver lastclose completed\n");
 151
 152         if (dev->unique) {
 153                 drm_free(dev->unique, strlen(dev->unique) + 1, DRM_MEM_DRIVER);
 154                 dev->unique = NULL;
 155                 dev->unique_len = 0;
 156         }
 157
 158         if (dev->irq_enabled)
 159                 drm_irq_uninstall(dev);
 160
 161         mutex_lock(&dev->struct_mutex);
 162
 163         /* Free drawable information memory */
 164         drm_drawable_free_all(dev);
 165         del_timer(&dev->timer);
 166
 167         /* Clear pid list */
 168         if (dev->magicfree.next) {
 169                 list_for_each_entry_safe(pt, next, &dev->magicfree, head) {
 170                         list_del(&pt->head);
 171                         drm_ht_remove_item(&dev->magiclist, &pt->hash_item);
 172                         drm_free(pt, sizeof(*pt), DRM_MEM_MAGIC);
 173                 }
 174                 drm_ht_remove(&dev->magiclist);
 175         }
 176
 177         /* Clear AGP information */
 178         if (drm_core_has_AGP(dev) && dev->agp) {
 179                 struct drm_agp_mem *entry, *tempe;
 180
 181                 /* Remove AGP resources, but leave dev->agp
 182                    intact until drv_cleanup is called. */
 183                 list_for_each_entry_safe(entry, tempe, &dev->agp->memory, head) {
 184                         if (entry->bound)
 185                                 drm_unbind_agp(entry->memory);
 186                         drm_free_agp(entry->memory, entry->pages);
 187                         drm_free(entry, sizeof(*entry), DRM_MEM_AGPLISTS);
 188                 }
 189                 INIT_LIST_HEAD(&dev->agp->memory);
 190
 191                 if (dev->agp->acquired)
 192                         drm_agp_release(dev);
 193
 194                 dev->agp->acquired = 0;
 195                 dev->agp->enabled = 0;
 196         }
 197         if (drm_core_check_feature(dev, DRIVER_SG) && dev->sg) {
 198                 drm_sg_cleanup(dev->sg);
 199                 dev->sg = NULL;
 200         }
 201
 202         /* Clear vma list (only built for debugging) */
 203         list_for_each_entry_safe(vma, vma_temp, &dev->vmalist, head) {
 204                 list_del(&vma->head);
 205                 drm_free(vma, sizeof(*vma), DRM_MEM_VMAS);
 206         }
 207
 208         list_for_each_entry_safe(r_list, list_t, &dev->maplist, head) {
 209                 if (!(r_list->map->flags & _DRM_DRIVER)) {
 210                         drm_rmmap_locked(dev, r_list->map);
 211                         r_list = NULL;
 212                 }
 213         }
 214
 215         if (drm_core_check_feature(dev, DRIVER_DMA_QUEUE) && dev->queuelist) {
 216                 for (i = 0; i < dev->queue_count; i++) {
 217                         if (dev->queuelist[i]) {
 218                                 drm_free(dev->queuelist[i],
 219                                          sizeof(*dev->queuelist[0]),
 220                                          DRM_MEM_QUEUES);
 221                                 dev->queuelist[i] = NULL;
 222                         }
 223                 }
 224                 drm_free(dev->queuelist,
 225                          dev->queue_slots * sizeof(*dev->queuelist),
 226                          DRM_MEM_QUEUES);
 227                 dev->queuelist = NULL;
 228         }
 229         dev->queue_count = 0;
 230
 231         if (drm_core_check_feature(dev, DRIVER_HAVE_DMA))
 232                 drm_dma_takedown(dev);
 233
 234         if (dev->lock.hw_lock) {
 235                 dev->sigdata.lock = dev->lock.hw_lock = NULL;   /* SHM removed */
 236                 dev->lock.file_priv = NULL;
 237                 wake_up_interruptible(&dev->lock.lock_queue);
 238         }
 239         mutex_unlock(&dev->struct_mutex);
 240
 241         DRM_DEBUG("lastclose completed\n");
 242         return 0;
 243 }
 244
 245 /**
 246  * Module initialization. Called via init_module at module load time, or via
 247  * linux/init/main.c (this is not currently supported).
 248  *
 249  * \return zero on success or a negative number on failure.
 250  *
 251  * Initializes an array of drm_device structures, and attempts to
 252  * initialize all available devices, using consecutive minors, registering the
 253  * stubs and initializing the AGP device.
 254  *
 255  * Expands the \c DRIVER_PREINIT and \c DRIVER_POST_INIT macros before and
 256  * after the initialization for driver customization.
 257  */
 258 int drm_init(struct drm_driver *driver)
 259 {
 260         struct pci_dev *pdev = NULL;
 261         struct pci_device_id *pid;
 262         int i;
 263
 264         DRM_DEBUG("\n");
 265
 266         for (i = 0; driver->pci_driver.id_table[i].vendor != 0; i++) {
 267                 pid = (struct pci_device_id *)&driver->pci_driver.id_table[i];
 268
 269                 /* Loop around setting up a DRM device for each PCI device
 270                  * matching our ID and device class.  If we had the internal
 271                  * function that pci_get_subsys and pci_get_class used, we'd
 272                  * be able to just pass pid in instead of doing a two-stage
 273                  * thing.
 274                  */
 275                 pdev = NULL;
 276                 while ((pdev =
 277                         pci_get_subsys(pid->vendor, pid->device, pid->subvendor,
 278                                        pid->subdevice, pdev)) != NULL) {
 279                         if ((pdev->class & pid->class_mask) != pid->class)
 280                                 continue;
 281
 282                         /* stealth mode requires a manual probe */
 283                         pci_dev_get(pdev);
 284                         drm_get_dev(pdev, pid, driver);
 285                 }
 286         }
 287         return 0;
 288 }
 289
 290 EXPORT_SYMBOL(drm_init);
 291
 292 /**
 293  * Called via cleanup_module() at module unload time.
 294  *
 295  * Cleans up all DRM device, calling drm_lastclose().
 296  *
 297  * \sa drm_init
 298  */
 299 static void drm_cleanup(struct drm_device * dev)
 300 {
 301         DRM_DEBUG("\n");
 302
 303         if (!dev) {
 304                 DRM_ERROR("cleanup called no dev\n");
 305                 return;
 306         }
 307
 308         drm_vblank_cleanup(dev);
 309
 310         drm_lastclose(dev);
 311
 312         if (drm_core_has_MTRR(dev) && drm_core_has_AGP(dev) &&
 313             dev->agp && dev->agp->agp_mtrr >= 0) {
 314                 int retval;
 315                 retval = mtrr_del(dev->agp->agp_mtrr,
 316                                   dev->agp->agp_info.aper_base,
 317                                   dev->agp->agp_info.aper_size * 1024 * 1024);
 318                 DRM_DEBUG("mtrr_del=%d\n", retval);
 319         }
 320
 321         if (drm_core_has_AGP(dev) && dev->agp) {
 322                 drm_free(dev->agp, sizeof(*dev->agp), DRM_MEM_AGPLISTS);
 323                 dev->agp = NULL;
 324         }
 325
 326         if (dev->driver->unload)
 327                 dev->driver->unload(dev);
 328
 329         drm_ht_remove(&dev->map_hash);
 330         drm_ctxbitmap_cleanup(dev);
 331
 332         drm_put_minor(&dev->primary);
 333         if (drm_put_dev(dev))
 334                 DRM_ERROR("Cannot unload module\n");
 335 }
 336
 337 static int drm_minors_cleanup(int id, void *ptr, void *data)
 338 {
 339         struct drm_minor *minor = ptr;
 340         struct drm_device *dev;
 341         struct drm_driver *driver = data;
 342
 343         dev = minor->dev;
 344         if (minor->dev->driver != driver)
 345                 return 0;
 346
 347         if (minor->type != DRM_MINOR_LEGACY)
 348                 return 0;
 349
 350         if (dev)
 351                 pci_dev_put(dev->pdev);
 352         drm_cleanup(dev);
 353         return 1;
 354 }
 355
 356 void drm_exit(struct drm_driver *driver)
 357 {
 358         DRM_DEBUG("\n");
 359
 360         idr_for_each(&drm_minors_idr, &drm_minors_cleanup, driver);
 361
 362         DRM_INFO("Module unloaded\n");
 363 }
 364
 365 EXPORT_SYMBOL(drm_exit);
 366
 367 /** File operations structure */
 368 static const struct file_operations drm_stub_fops = {
 369         .owner = THIS_MODULE,
 370         .open = drm_stub_open
 371 };
 372
 373 static int __init drm_core_init(void)
 374 {
 375         int ret = -ENOMEM;
 376
 377         idr_init(&drm_minors_idr);
 378
 379         if (register_chrdev(DRM_MAJOR, "drm", &drm_stub_fops))
 380                 goto err_p1;
 381
 382         drm_class = drm_sysfs_create(THIS_MODULE, "drm");
 383         if (IS_ERR(drm_class)) {
 384                 printk(KERN_ERR "DRM: Error creating drm class.\n");
 385                 ret = PTR_ERR(drm_class);
 386                 goto err_p2;
 387         }
 388
 389         drm_proc_root = proc_mkdir("dri", NULL);
 390         if (!drm_proc_root) {
 391                 DRM_ERROR("Cannot create /proc/dri\n");
 392                 ret = -1;
 393                 goto err_p3;
 394         }
 395
 396         drm_mem_init();
 397
 398         DRM_INFO("Initialized %s %d.%d.%d %s\n",
 399                  CORE_NAME, CORE_MAJOR, CORE_MINOR, CORE_PATCHLEVEL, CORE_DATE);
 400         return 0;
 401 err_p3:
 402         drm_sysfs_destroy();
 403 err_p2:
 404         unregister_chrdev(DRM_MAJOR, "drm");
 405
 406         idr_destroy(&drm_minors_idr);
 407 err_p1:
 408         return ret;
 409 }
 410
 411 static void __exit drm_core_exit(void)
 412 {
 413         remove_proc_entry("dri", NULL);
 414         drm_sysfs_destroy();
 415
 416         unregister_chrdev(DRM_MAJOR, "drm");
 417
 418         idr_destroy(&drm_minors_idr);
 419 }
 420
 421 module_init(drm_core_init);
 422 module_exit(drm_core_exit);
 423
 424 /**
 425  * Get version information
 426  *
 427  * \param inode device inode.
 428  * \param filp file pointer.
 429  * \param cmd command.
 430  * \param arg user argument, pointing to a drm_version structure.
 431  * \return zero on success or negative number on failure.
 432  *
 433  * Fills in the version information in \p arg.
 434  */
 435 static int drm_version(struct drm_device *dev, void *data,
 436                        struct drm_file *file_priv)
 437 {
 438         struct drm_version *version = data;
 439         int len;
 440
 441         version->version_major = dev->driver->major;
 442         version->version_minor = dev->driver->minor;
 443         version->version_patchlevel = dev->driver->patchlevel;
 444         DRM_COPY(version->name, dev->driver->name);
 445         DRM_COPY(version->date, dev->driver->date);
 446         DRM_COPY(version->desc, dev->driver->desc);
 447
 448         return 0;
 449 }
 450
 451 /**
 452  * Called whenever a process performs an ioctl on /dev/drm.
 453  *
 454  * \param inode device inode.
 455  * \param file_priv DRM file private.
 456  * \param cmd command.
 457  * \param arg user argument.
 458  * \return zero on success or negative number on failure.
 459  *
 460  * Looks up the ioctl function in the ::ioctls table, checking for root
 461  * previleges if so required, and dispatches to the respective function.
 462  */
 463 int drm_ioctl(struct inode *inode, struct file *filp,
 464               unsigned int cmd, unsigned long arg)
 465 {
 466         struct drm_file *file_priv = filp->private_data;
 467         struct drm_device *dev = file_priv->minor->dev;
 468         struct drm_ioctl_desc *ioctl;
 469         drm_ioctl_t *func;
 470         unsigned int nr = DRM_IOCTL_NR(cmd);
 471         int retcode = -EINVAL;
 472         char *kdata = NULL;
 473
 474         atomic_inc(&dev->ioctl_count);
 475         atomic_inc(&dev->counts[_DRM_STAT_IOCTLS]);
 476         ++file_priv->ioctl_count;
 477
 478         DRM_DEBUG("pid=%d, cmd=0x%02x, nr=0x%02x, dev 0x%lx, auth=%d\n",
 479                   task_pid_nr(current), cmd, nr,
 480                   (long)old_encode_dev(file_priv->minor->device),
 481                   file_priv->authenticated);
 482
 483         if ((nr >= DRM_CORE_IOCTL_COUNT) &&
 484             ((nr < DRM_COMMAND_BASE) || (nr >= DRM_COMMAND_END)))
 485                 goto err_i1;
 486         if ((nr >= DRM_COMMAND_BASE) && (nr < DRM_COMMAND_END) &&
 487             (nr < DRM_COMMAND_BASE + dev->driver->num_ioctls))
 488                 ioctl = &dev->driver->ioctls[nr - DRM_COMMAND_BASE];
 489         else if ((nr >= DRM_COMMAND_END) || (nr < DRM_COMMAND_BASE)) {
 490                 ioctl = &drm_ioctls[nr];
 491                 cmd = ioctl->cmd;
 492         } else
 493                 goto err_i1;
 494
 495         /* Do not trust userspace, use our own definition */
 496         func = ioctl->func;
 497         /* is there a local override? */
 498         if ((nr == DRM_IOCTL_NR(DRM_IOCTL_DMA)) && dev->driver->dma_ioctl)
 499                 func = dev->driver->dma_ioctl;
 500
 501         if (!func) {
 502                 DRM_DEBUG("no function\n");
 503                 retcode = -EINVAL;
 504         } else if (((ioctl->flags & DRM_ROOT_ONLY) && !capable(CAP_SYS_ADMIN)) ||
 505                    ((ioctl->flags & DRM_AUTH) && !file_priv->authenticated) ||
 506                    ((ioctl->flags & DRM_MASTER) && !file_priv->master)) {
 507                 retcode = -EACCES;
 508         } else {
 509                 if (cmd & (IOC_IN | IOC_OUT)) {
 510                         kdata = kmalloc(_IOC_SIZE(cmd), GFP_KERNEL);
 511                         if (!kdata) {
 512                                 retcode = -ENOMEM;
 513                                 goto err_i1;
 514                         }
 515                 }
 516
 517                 if (cmd & IOC_IN) {
 518                         if (copy_from_user(kdata, (void __user *)arg,
 519                                            _IOC_SIZE(cmd)) != 0) {
 520                                 retcode = -EFAULT;
 521                                 goto err_i1;
 522                         }
 523                 }
 524                 retcode = func(dev, kdata, file_priv);
 525
 526                 if ((retcode == 0) && (cmd & IOC_OUT)) {
 527                         if (copy_to_user((void __user *)arg, kdata,
 528                                          _IOC_SIZE(cmd)) != 0)
 529                                 retcode = -EFAULT;
 530                 }
 531         }
 532
 533       err_i1:
 534         if (kdata)
 535                 kfree(kdata);
 536         atomic_dec(&dev->ioctl_count);
 537         if (retcode)
 538                 DRM_DEBUG("ret = %x\n", retcode);
 539         return retcode;
 540 }
 541
 542 EXPORT_SYMBOL(drm_ioctl);
 543
 544 drm_local_map_t *drm_getsarea(struct drm_device *dev)
 545 {
 546         struct drm_map_list *entry;
 547
 548         list_for_each_entry(entry, &dev->maplist, head) {
 549                 if (entry->map && entry->map->type == _DRM_SHM &&
 550                     (entry->map->flags & _DRM_CONTAINS_LOCK)) {
 551                         return entry->map;
 552                 }
 553         }
 554         return NULL;
 555 }
 556 EXPORT_SYMBOL(drm_getsarea);