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