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