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(drm_device_t * dev)
 133 {
 134         drm_magic_entry_t *pt, *next;
 135         drm_map_list_t *r_list, *list_t;
 136         drm_vma_entry_t *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         /* Free drawable information memory */
 155         for (i = 0; i < dev->drw_bitfield_length / sizeof(*dev->drw_bitfield);
 156              i++) {
 157                 struct drm_drawable_info *info = drm_get_drawable_info(dev, i);
 158
 159                 if (info) {
 160                         drm_free(info->rects, info->num_rects *
 161                                  sizeof(struct drm_clip_rect), DRM_MEM_BUFS);
 162                         drm_free(info, sizeof(*info), DRM_MEM_BUFS);
 163                 }
 164         }
 165
 166         mutex_lock(&dev->struct_mutex);
 167         del_timer(&dev->timer);
 168
 169         /* Clear pid list */
 170         if (dev->magicfree.next) {
 171                 list_for_each_entry_safe(pt, next, &dev->magicfree, head) {
 172                         list_del(&pt->head);
 173                         drm_ht_remove_item(&dev->magiclist, &pt->hash_item);
 174                         drm_free(pt, sizeof(*pt), DRM_MEM_MAGIC);
 175                 }
 176                 drm_ht_remove(&dev->magiclist);
 177         }
 178
 179         /* Clear AGP information */
 180         if (drm_core_has_AGP(dev) && dev->agp) {
 181                 drm_agp_mem_t *entry, *tempe;
 182
 183                 /* Remove AGP resources, but leave dev->agp
 184                    intact until drv_cleanup is called. */
 185                 list_for_each_entry_safe(entry, tempe, &dev->agp->memory, head) {
 186                         if (entry->bound)
 187                                 drm_unbind_agp(entry->memory);
 188                         drm_free_agp(entry->memory, entry->pages);
 189                         drm_free(entry, sizeof(*entry), DRM_MEM_AGPLISTS);
 190                 }
 191                 INIT_LIST_HEAD(&dev->agp->memory);
 192
 193                 if (dev->agp->acquired)
 194                         drm_agp_release(dev);
 195
 196                 dev->agp->acquired = 0;
 197                 dev->agp->enabled = 0;
 198         }
 199         if (drm_core_check_feature(dev, DRIVER_SG) && dev->sg) {
 200                 drm_sg_cleanup(dev->sg);
 201                 dev->sg = NULL;
 202         }
 203
 204         /* Clear vma list (only built for debugging) */
 205         list_for_each_entry_safe(vma, vma_temp, &dev->vmalist, head) {
 206                 list_del(&vma->head);
 207                 drm_free(vma, sizeof(*vma), DRM_MEM_VMAS);
 208         }
 209
 210         list_for_each_entry_safe(r_list, list_t, &dev->maplist, head) {
 211                 drm_rmmap_locked(dev, r_list->map);
 212                 r_list = NULL;
 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.filp = 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         drm_mem_init();
 267
 268         for (i = 0; driver->pci_driver.id_table[i].vendor != 0; i++) {
 269                 pid = (struct pci_device_id *)&driver->pci_driver.id_table[i];
 270
 271                 pdev = NULL;
 272                 /* pass back in pdev to account for multiple identical cards */
 273                 while ((pdev =
 274                         pci_get_subsys(pid->vendor, pid->device, pid->subvendor,
 275                                        pid->subdevice, pdev)) != NULL) {
 276                         /* stealth mode requires a manual probe */
 277                         pci_dev_get(pdev);
 278                         drm_get_dev(pdev, pid, driver);
 279                 }
 280         }
 281         return 0;
 282 }
 283
 284 EXPORT_SYMBOL(drm_init);
 285
 286 /**
 287  * Called via cleanup_module() at module unload time.
 288  *
 289  * Cleans up all DRM device, calling drm_lastclose().
 290  *
 291  * \sa drm_init
 292  */
 293 static void drm_cleanup(drm_device_t * dev)
 294 {
 295         DRM_DEBUG("\n");
 296
 297         if (!dev) {
 298                 DRM_ERROR("cleanup called no dev\n");
 299                 return;
 300         }
 301
 302         drm_lastclose(dev);
 303
 304         drm_ht_remove(&dev->map_hash);
 305
 306         drm_ctxbitmap_cleanup(dev);
 307
 308         if (drm_core_has_MTRR(dev) && drm_core_has_AGP(dev) &&
 309             dev->agp && dev->agp->agp_mtrr >= 0) {
 310                 int retval;
 311                 retval = mtrr_del(dev->agp->agp_mtrr,
 312                                   dev->agp->agp_info.aper_base,
 313                                   dev->agp->agp_info.aper_size * 1024 * 1024);
 314                 DRM_DEBUG("mtrr_del=%d\n", retval);
 315         }
 316
 317         if (drm_core_has_AGP(dev) && dev->agp) {
 318                 drm_free(dev->agp, sizeof(*dev->agp), DRM_MEM_AGPLISTS);
 319                 dev->agp = NULL;
 320         }
 321
 322         if (dev->driver->unload)
 323                 dev->driver->unload(dev);
 324
 325         drm_put_head(&dev->primary);
 326         if (drm_put_dev(dev))
 327                 DRM_ERROR("Cannot unload module\n");
 328 }
 329
 330 void drm_exit(struct drm_driver *driver)
 331 {
 332         int i;
 333         drm_device_t *dev = NULL;
 334         drm_head_t *head;
 335
 336         DRM_DEBUG("\n");
 337
 338         for (i = 0; i < drm_cards_limit; i++) {
 339                 head = drm_heads[i];
 340                 if (!head)
 341                         continue;
 342                 if (!head->dev)
 343                         continue;
 344                 if (head->dev->driver != driver)
 345                         continue;
 346                 dev = head->dev;
 347                 if (dev) {
 348                         /* release the pci driver */
 349                         if (dev->pdev)
 350                                 pci_dev_put(dev->pdev);
 351                         drm_cleanup(dev);
 352                 }
 353         }
 354         DRM_INFO("Module unloaded\n");
 355 }
 356
 357 EXPORT_SYMBOL(drm_exit);
 358
 359 /** File operations structure */
 360 static const struct file_operations drm_stub_fops = {
 361         .owner = THIS_MODULE,
 362         .open = drm_stub_open
 363 };
 364
 365 static int __init drm_core_init(void)
 366 {
 367         int ret = -ENOMEM;
 368
 369         drm_cards_limit =
 370             (drm_cards_limit <
 371              DRM_MAX_MINOR + 1 ? drm_cards_limit : DRM_MAX_MINOR + 1);
 372         drm_heads =
 373             drm_calloc(drm_cards_limit, sizeof(*drm_heads), DRM_MEM_STUB);
 374         if (!drm_heads)
 375                 goto err_p1;
 376
 377         if (register_chrdev(DRM_MAJOR, "drm", &drm_stub_fops))
 378                 goto err_p1;
 379
 380         drm_class = drm_sysfs_create(THIS_MODULE, "drm");
 381         if (IS_ERR(drm_class)) {
 382                 printk(KERN_ERR "DRM: Error creating drm class.\n");
 383                 ret = PTR_ERR(drm_class);
 384                 goto err_p2;
 385         }
 386
 387         drm_proc_root = proc_mkdir("dri", NULL);
 388         if (!drm_proc_root) {
 389                 DRM_ERROR("Cannot create /proc/dri\n");
 390                 ret = -1;
 391                 goto err_p3;
 392         }
 393
 394         DRM_INFO("Initialized %s %d.%d.%d %s\n",
 395                  CORE_NAME, CORE_MAJOR, CORE_MINOR, CORE_PATCHLEVEL, CORE_DATE);
 396         return 0;
 397       err_p3:
 398         drm_sysfs_destroy(drm_class);
 399       err_p2:
 400         unregister_chrdev(DRM_MAJOR, "drm");
 401         drm_free(drm_heads, sizeof(*drm_heads) * drm_cards_limit, DRM_MEM_STUB);
 402       err_p1:
 403         return ret;
 404 }
 405
 406 static void __exit drm_core_exit(void)
 407 {
 408         remove_proc_entry("dri", NULL);
 409         drm_sysfs_destroy(drm_class);
 410
 411         unregister_chrdev(DRM_MAJOR, "drm");
 412
 413         drm_free(drm_heads, sizeof(*drm_heads) * drm_cards_limit, DRM_MEM_STUB);
 414 }
 415
 416 module_init(drm_core_init);
 417 module_exit(drm_core_exit);
 418
 419 /**
 420  * Get version information
 421  *
 422  * \param inode device inode.
 423  * \param filp file pointer.
 424  * \param cmd command.
 425  * \param arg user argument, pointing to a drm_version structure.
 426  * \return zero on success or negative number on failure.
 427  *
 428  * Fills in the version information in \p arg.
 429  */
 430 static int drm_version(struct inode *inode, struct file *filp,
 431                        unsigned int cmd, unsigned long arg)
 432 {
 433         drm_file_t *priv = filp->private_data;
 434         drm_device_t *dev = priv->head->dev;
 435         struct drm_version __user *argp = (void __user *)arg;
 436         struct drm_version version;
 437         int len;
 438
 439         if (copy_from_user(&version, argp, sizeof(version)))
 440                 return -EFAULT;
 441
 442         version.version_major = dev->driver->major;
 443         version.version_minor = dev->driver->minor;
 444         version.version_patchlevel = dev->driver->patchlevel;
 445         DRM_COPY(version.name, dev->driver->name);
 446         DRM_COPY(version.date, dev->driver->date);
 447         DRM_COPY(version.desc, dev->driver->desc);
 448
 449         if (copy_to_user(argp, &version, sizeof(version)))
 450                 return -EFAULT;
 451         return 0;
 452 }
 453
 454 /**
 455  * Called whenever a process performs an ioctl on /dev/drm.
 456  *
 457  * \param inode device inode.
 458  * \param filp file pointer.
 459  * \param cmd command.
 460  * \param arg user argument.
 461  * \return zero on success or negative number on failure.
 462  *
 463  * Looks up the ioctl function in the ::ioctls table, checking for root
 464  * previleges if so required, and dispatches to the respective function.
 465  */
 466 int drm_ioctl(struct inode *inode, struct file *filp,
 467               unsigned int cmd, unsigned long arg)
 468 {
 469         drm_file_t *priv = filp->private_data;
 470         drm_device_t *dev = priv->head->dev;
 471         drm_ioctl_desc_t *ioctl;
 472         drm_ioctl_t *func;
 473         unsigned int nr = DRM_IOCTL_NR(cmd);
 474         int retcode = -EINVAL;
 475
 476         atomic_inc(&dev->ioctl_count);
 477         atomic_inc(&dev->counts[_DRM_STAT_IOCTLS]);
 478         ++priv->ioctl_count;
 479
 480         DRM_DEBUG("pid=%d, cmd=0x%02x, nr=0x%02x, dev 0x%lx, auth=%d\n",
 481                   current->pid, cmd, nr,
 482                   (long)old_encode_dev(priv->head->device),
 483                   priv->authenticated);
 484
 485         if ((nr >= DRM_CORE_IOCTL_COUNT) &&
 486             ((nr < DRM_COMMAND_BASE) || (nr >= DRM_COMMAND_END)))
 487                 goto err_i1;
 488         if ((nr >= DRM_COMMAND_BASE) && (nr < DRM_COMMAND_END) &&
 489             (nr < DRM_COMMAND_BASE + dev->driver->num_ioctls))
 490                 ioctl = &dev->driver->ioctls[nr - DRM_COMMAND_BASE];
 491         else if ((nr >= DRM_COMMAND_END) || (nr < DRM_COMMAND_BASE))
 492                 ioctl = &drm_ioctls[nr];
 493         else
 494                 goto err_i1;
 495
 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) && !priv->authenticated) ||
 506                    ((ioctl->flags & DRM_MASTER) && !priv->master)) {
 507                 retcode = -EACCES;
 508         } else {
 509                 retcode = func(inode, filp, cmd, arg);
 510         }
 511
 512       err_i1:
 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 drm_local_map_t *drm_getsarea(struct drm_device *dev)
 522 {
 523         drm_map_list_t *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);