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 <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|DRM_ROOT_ONLY),
  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|DRM_ROOT_ONLY),
  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                         drm_free(entry, sizeof(*entry), DRM_MEM_AGPLISTS);
 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                 drm_free(vma, sizeof(*vma), DRM_MEM_VMAS);
 212         }
 213
 214         if (drm_core_check_feature(dev, DRIVER_DMA_QUEUE) && dev->queuelist) {
 215                 for (i = 0; i < dev->queue_count; i++) {
 216                         if (dev->queuelist[i]) {
 217                                 drm_free(dev->queuelist[i],
 218                                          sizeof(*dev->queuelist[0]),
 219                                          DRM_MEM_QUEUES);
 220                                 dev->queuelist[i] = NULL;
 221                         }
 222                 }
 223                 drm_free(dev->queuelist,
 224                          dev->queue_slots * sizeof(*dev->queuelist),
 225                          DRM_MEM_QUEUES);
 226                 dev->queuelist = NULL;
 227         }
 228         dev->queue_count = 0;
 229
 230         if (drm_core_check_feature(dev, DRIVER_HAVE_DMA) &&
 231             !drm_core_check_feature(dev, DRIVER_MODESET))
 232                 drm_dma_takedown(dev);
 233
 234         dev->dev_mapping = NULL;
 235         mutex_unlock(&dev->struct_mutex);
 236
 237         DRM_DEBUG("lastclose completed\n");
 238         return 0;
 239 }
 240
 241 /**
 242  * Module initialization. Called via init_module at module load time, or via
 243  * linux/init/main.c (this is not currently supported).
 244  *
 245  * \return zero on success or a negative number on failure.
 246  *
 247  * Initializes an array of drm_device structures, and attempts to
 248  * initialize all available devices, using consecutive minors, registering the
 249  * stubs and initializing the AGP device.
 250  *
 251  * Expands the \c DRIVER_PREINIT and \c DRIVER_POST_INIT macros before and
 252  * after the initialization for driver customization.
 253  */
 254 int drm_init(struct drm_driver *driver)
 255 {
 256         struct pci_dev *pdev = NULL;
 257         const struct pci_device_id *pid;
 258         int i;
 259
 260         DRM_DEBUG("\n");
 261
 262         INIT_LIST_HEAD(&driver->device_list);
 263
 264         if (driver->driver_features & DRIVER_MODESET)
 265                 return pci_register_driver(&driver->pci_driver);
 266
 267         /* If not using KMS, fall back to stealth mode manual scanning. */
 268         for (i = 0; driver->pci_driver.id_table[i].vendor != 0; i++) {
 269                 pid = &driver->pci_driver.id_table[i];
 270
 271                 /* Loop around setting up a DRM device for each PCI device
 272                  * matching our ID and device class.  If we had the internal
 273                  * function that pci_get_subsys and pci_get_class used, we'd
 274                  * be able to just pass pid in instead of doing a two-stage
 275                  * thing.
 276                  */
 277                 pdev = NULL;
 278                 while ((pdev =
 279                         pci_get_subsys(pid->vendor, pid->device, pid->subvendor,
 280                                        pid->subdevice, pdev)) != NULL) {
 281                         if ((pdev->class & pid->class_mask) != pid->class)
 282                                 continue;
 283
 284                         /* stealth mode requires a manual probe */
 285                         pci_dev_get(pdev);
 286                         drm_get_dev(pdev, pid, driver);
 287                 }
 288         }
 289         return 0;
 290 }
 291
 292 EXPORT_SYMBOL(drm_init);
 293
 294 void drm_exit(struct drm_driver *driver)
 295 {
 296         struct drm_device *dev, *tmp;
 297         DRM_DEBUG("\n");
 298
 299         if (driver->driver_features & DRIVER_MODESET) {
 300                 pci_unregister_driver(&driver->pci_driver);
 301         } else {
 302                 list_for_each_entry_safe(dev, tmp, &driver->device_list, driver_item)
 303                         drm_put_dev(dev);
 304         }
 305
 306         DRM_INFO("Module unloaded\n");
 307 }
 308
 309 EXPORT_SYMBOL(drm_exit);
 310
 311 /** File operations structure */
 312 static const struct file_operations drm_stub_fops = {
 313         .owner = THIS_MODULE,
 314         .open = drm_stub_open
 315 };
 316
 317 static int __init drm_core_init(void)
 318 {
 319         int ret = -ENOMEM;
 320
 321         idr_init(&drm_minors_idr);
 322
 323         if (register_chrdev(DRM_MAJOR, "drm", &drm_stub_fops))
 324                 goto err_p1;
 325
 326         drm_class = drm_sysfs_create(THIS_MODULE, "drm");
 327         if (IS_ERR(drm_class)) {
 328                 printk(KERN_ERR "DRM: Error creating drm class.\n");
 329                 ret = PTR_ERR(drm_class);
 330                 goto err_p2;
 331         }
 332
 333         drm_proc_root = proc_mkdir("dri", NULL);
 334         if (!drm_proc_root) {
 335                 DRM_ERROR("Cannot create /proc/dri\n");
 336                 ret = -1;
 337                 goto err_p3;
 338         }
 339
 340         drm_debugfs_root = debugfs_create_dir("dri", NULL);
 341         if (!drm_debugfs_root) {
 342                 DRM_ERROR("Cannot create /debugfs/dri\n");
 343                 ret = -1;
 344                 goto err_p3;
 345         }
 346
 347         drm_mem_init();
 348
 349         DRM_INFO("Initialized %s %d.%d.%d %s\n",
 350                  CORE_NAME, CORE_MAJOR, CORE_MINOR, CORE_PATCHLEVEL, CORE_DATE);
 351         return 0;
 352 err_p3:
 353         drm_sysfs_destroy();
 354 err_p2:
 355         unregister_chrdev(DRM_MAJOR, "drm");
 356
 357         idr_destroy(&drm_minors_idr);
 358 err_p1:
 359         return ret;
 360 }
 361
 362 static void __exit drm_core_exit(void)
 363 {
 364         remove_proc_entry("dri", NULL);
 365         debugfs_remove(drm_debugfs_root);
 366         drm_sysfs_destroy();
 367
 368         unregister_chrdev(DRM_MAJOR, "drm");
 369
 370         idr_destroy(&drm_minors_idr);
 371 }
 372
 373 module_init(drm_core_init);
 374 module_exit(drm_core_exit);
 375
 376 /**
 377  * Get version information
 378  *
 379  * \param inode device inode.
 380  * \param filp file pointer.
 381  * \param cmd command.
 382  * \param arg user argument, pointing to a drm_version structure.
 383  * \return zero on success or negative number on failure.
 384  *
 385  * Fills in the version information in \p arg.
 386  */
 387 static int drm_version(struct drm_device *dev, void *data,
 388                        struct drm_file *file_priv)
 389 {
 390         struct drm_version *version = data;
 391         int len;
 392
 393         version->version_major = dev->driver->major;
 394         version->version_minor = dev->driver->minor;
 395         version->version_patchlevel = dev->driver->patchlevel;
 396         DRM_COPY(version->name, dev->driver->name);
 397         DRM_COPY(version->date, dev->driver->date);
 398         DRM_COPY(version->desc, dev->driver->desc);
 399
 400         return 0;
 401 }
 402
 403 /**
 404  * Called whenever a process performs an ioctl on /dev/drm.
 405  *
 406  * \param inode device inode.
 407  * \param file_priv DRM file private.
 408  * \param cmd command.
 409  * \param arg user argument.
 410  * \return zero on success or negative number on failure.
 411  *
 412  * Looks up the ioctl function in the ::ioctls table, checking for root
 413  * previleges if so required, and dispatches to the respective function.
 414  */
 415 int drm_ioctl(struct inode *inode, struct file *filp,
 416               unsigned int cmd, unsigned long arg)
 417 {
 418         struct drm_file *file_priv = filp->private_data;
 419         struct drm_device *dev = file_priv->minor->dev;
 420         struct drm_ioctl_desc *ioctl;
 421         drm_ioctl_t *func;
 422         unsigned int nr = DRM_IOCTL_NR(cmd);
 423         int retcode = -EINVAL;
 424         char stack_kdata[128];
 425         char *kdata = NULL;
 426
 427         atomic_inc(&dev->ioctl_count);
 428         atomic_inc(&dev->counts[_DRM_STAT_IOCTLS]);
 429         ++file_priv->ioctl_count;
 430
 431         DRM_DEBUG("pid=%d, cmd=0x%02x, nr=0x%02x, dev 0x%lx, auth=%d\n",
 432                   task_pid_nr(current), cmd, nr,
 433                   (long)old_encode_dev(file_priv->minor->device),
 434                   file_priv->authenticated);
 435
 436         if ((nr >= DRM_CORE_IOCTL_COUNT) &&
 437             ((nr < DRM_COMMAND_BASE) || (nr >= DRM_COMMAND_END)))
 438                 goto err_i1;
 439         if ((nr >= DRM_COMMAND_BASE) && (nr < DRM_COMMAND_END) &&
 440             (nr < DRM_COMMAND_BASE + dev->driver->num_ioctls))
 441                 ioctl = &dev->driver->ioctls[nr - DRM_COMMAND_BASE];
 442         else if ((nr >= DRM_COMMAND_END) || (nr < DRM_COMMAND_BASE)) {
 443                 ioctl = &drm_ioctls[nr];
 444                 cmd = ioctl->cmd;
 445         } else
 446                 goto err_i1;
 447
 448         /* Do not trust userspace, use our own definition */
 449         func = ioctl->func;
 450         /* is there a local override? */
 451         if ((nr == DRM_IOCTL_NR(DRM_IOCTL_DMA)) && dev->driver->dma_ioctl)
 452                 func = dev->driver->dma_ioctl;
 453
 454         if (!func) {
 455                 DRM_DEBUG("no function\n");
 456                 retcode = -EINVAL;
 457         } else if (((ioctl->flags & DRM_ROOT_ONLY) && !capable(CAP_SYS_ADMIN)) ||
 458                    ((ioctl->flags & DRM_AUTH) && !file_priv->authenticated) ||
 459                    ((ioctl->flags & DRM_MASTER) && !file_priv->is_master) ||
 460                    (!(ioctl->flags & DRM_CONTROL_ALLOW) && (file_priv->minor->type == DRM_MINOR_CONTROL))) {
 461                 retcode = -EACCES;
 462         } else {
 463                 if (cmd & (IOC_IN | IOC_OUT)) {
 464                         if (_IOC_SIZE(cmd) <= sizeof(stack_kdata)) {
 465                                 kdata = stack_kdata;
 466                         } else {
 467                                 kdata = kmalloc(_IOC_SIZE(cmd), GFP_KERNEL);
 468                                 if (!kdata) {
 469                                         retcode = -ENOMEM;
 470                                         goto err_i1;
 471                                 }
 472                         }
 473                 }
 474
 475                 if (cmd & IOC_IN) {
 476                         if (copy_from_user(kdata, (void __user *)arg,
 477                                            _IOC_SIZE(cmd)) != 0) {
 478                                 retcode = -EFAULT;
 479                                 goto err_i1;
 480                         }
 481                 }
 482                 retcode = func(dev, kdata, file_priv);
 483
 484                 if (cmd & IOC_OUT) {
 485                         if (copy_to_user((void __user *)arg, kdata,
 486                                          _IOC_SIZE(cmd)) != 0)
 487                                 retcode = -EFAULT;
 488                 }
 489         }
 490
 491       err_i1:
 492         if (kdata != stack_kdata)
 493                 kfree(kdata);
 494         atomic_dec(&dev->ioctl_count);
 495         if (retcode)
 496                 DRM_DEBUG("ret = %x\n", retcode);
 497         return retcode;
 498 }
 499
 500 EXPORT_SYMBOL(drm_ioctl);
 501
 502 struct drm_local_map *drm_getsarea(struct drm_device *dev)
 503 {
 504         struct drm_map_list *entry;
 505
 506         list_for_each_entry(entry, &dev->maplist, head) {
 507                 if (entry->map && entry->map->type == _DRM_SHM &&
 508                     (entry->map->flags & _DRM_CONTAINS_LOCK)) {
 509                         return entry->map;
 510                 }
 511         }
 512         return NULL;
 513 }
 514 EXPORT_SYMBOL(drm_getsarea);