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         DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETRESOURCES, drm_mode_getresources, DRM_MASTER|DRM_CONTROL_ALLOW),
 131         DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETCRTC, drm_mode_getcrtc, DRM_MASTER|DRM_CONTROL_ALLOW),
 132         DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETCRTC, drm_mode_setcrtc, DRM_MASTER|DRM_CONTROL_ALLOW),
 133         DRM_IOCTL_DEF(DRM_IOCTL_MODE_CURSOR, drm_mode_cursor_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW),
 134         DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETGAMMA, drm_mode_gamma_get_ioctl, DRM_MASTER),
 135         DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETGAMMA, drm_mode_gamma_set_ioctl, DRM_MASTER),
 136         DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETENCODER, drm_mode_getencoder, DRM_MASTER|DRM_CONTROL_ALLOW),
 137         DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETCONNECTOR, drm_mode_getconnector, DRM_MASTER|DRM_CONTROL_ALLOW),
 138         DRM_IOCTL_DEF(DRM_IOCTL_MODE_ATTACHMODE, drm_mode_attachmode_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW),
 139         DRM_IOCTL_DEF(DRM_IOCTL_MODE_DETACHMODE, drm_mode_detachmode_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW),
 140         DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPROPERTY, drm_mode_getproperty_ioctl, DRM_MASTER | DRM_CONTROL_ALLOW),
 141         DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETPROPERTY, drm_mode_connector_property_set_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW),
 142         DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPROPBLOB, drm_mode_getblob_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW),
 143         DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETFB, drm_mode_getfb, DRM_MASTER|DRM_CONTROL_ALLOW),
 144         DRM_IOCTL_DEF(DRM_IOCTL_MODE_ADDFB, drm_mode_addfb, DRM_MASTER|DRM_CONTROL_ALLOW),
 145         DRM_IOCTL_DEF(DRM_IOCTL_MODE_RMFB, drm_mode_rmfb, DRM_MASTER|DRM_CONTROL_ALLOW),
 146         DRM_IOCTL_DEF(DRM_IOCTL_MODE_REPLACEFB, drm_mode_replacefb, DRM_MASTER|DRM_ROOT_ONLY|DRM_CONTROL_ALLOW),
 147 };
 148
 149 #define DRM_CORE_IOCTL_COUNT    ARRAY_SIZE( drm_ioctls )
 150
 151 /**
 152  * Take down the DRM device.
 153  *
 154  * \param dev DRM device structure.
 155  *
 156  * Frees every resource in \p dev.
 157  *
 158  * \sa drm_device
 159  */
 160 int drm_lastclose(struct drm_device * dev)
 161 {
 162         struct drm_vma_entry *vma, *vma_temp;
 163         int i;
 164
 165         DRM_DEBUG("\n");
 166
 167         if (dev->driver->lastclose)
 168                 dev->driver->lastclose(dev);
 169         DRM_DEBUG("driver lastclose completed\n");
 170
 171         if (dev->irq_enabled && !drm_core_check_feature(dev, DRIVER_MODESET))
 172                 drm_irq_uninstall(dev);
 173
 174         mutex_lock(&dev->struct_mutex);
 175
 176         /* Free drawable information memory */
 177         drm_drawable_free_all(dev);
 178         del_timer(&dev->timer);
 179
 180         /* Clear AGP information */
 181         if (drm_core_has_AGP(dev) && dev->agp &&
 182             !drm_core_check_feature(dev, DRIVER_MODESET)) {
 183                 struct drm_agp_mem *entry, *tempe;
 184
 185                 /* Remove AGP resources, but leave dev->agp
 186                    intact until drv_cleanup is called. */
 187                 list_for_each_entry_safe(entry, tempe, &dev->agp->memory, head) {
 188                         if (entry->bound)
 189                                 drm_unbind_agp(entry->memory);
 190                         drm_free_agp(entry->memory, entry->pages);
 191                         drm_free(entry, sizeof(*entry), DRM_MEM_AGPLISTS);
 192                 }
 193                 INIT_LIST_HEAD(&dev->agp->memory);
 194
 195                 if (dev->agp->acquired)
 196                         drm_agp_release(dev);
 197
 198                 dev->agp->acquired = 0;
 199                 dev->agp->enabled = 0;
 200         }
 201         if (drm_core_check_feature(dev, DRIVER_SG) && dev->sg &&
 202             !drm_core_check_feature(dev, DRIVER_MODESET)) {
 203                 drm_sg_cleanup(dev->sg);
 204                 dev->sg = NULL;
 205         }
 206
 207         /* Clear vma list (only built for debugging) */
 208         list_for_each_entry_safe(vma, vma_temp, &dev->vmalist, head) {
 209                 list_del(&vma->head);
 210                 drm_free(vma, sizeof(*vma), DRM_MEM_VMAS);
 211         }
 212
 213         if (drm_core_check_feature(dev, DRIVER_DMA_QUEUE) && dev->queuelist) {
 214                 for (i = 0; i < dev->queue_count; i++) {
 215                         if (dev->queuelist[i]) {
 216                                 drm_free(dev->queuelist[i],
 217                                          sizeof(*dev->queuelist[0]),
 218                                          DRM_MEM_QUEUES);
 219                                 dev->queuelist[i] = NULL;
 220                         }
 221                 }
 222                 drm_free(dev->queuelist,
 223                          dev->queue_slots * sizeof(*dev->queuelist),
 224                          DRM_MEM_QUEUES);
 225                 dev->queuelist = NULL;
 226         }
 227         dev->queue_count = 0;
 228
 229         if (drm_core_check_feature(dev, DRIVER_HAVE_DMA) &&
 230             !drm_core_check_feature(dev, DRIVER_MODESET))
 231                 drm_dma_takedown(dev);
 232
 233         dev->dev_mapping = NULL;
 234         mutex_unlock(&dev->struct_mutex);
 235
 236         DRM_DEBUG("lastclose completed\n");
 237         return 0;
 238 }
 239
 240 /**
 241  * Module initialization. Called via init_module at module load time, or via
 242  * linux/init/main.c (this is not currently supported).
 243  *
 244  * \return zero on success or a negative number on failure.
 245  *
 246  * Initializes an array of drm_device structures, and attempts to
 247  * initialize all available devices, using consecutive minors, registering the
 248  * stubs and initializing the AGP device.
 249  *
 250  * Expands the \c DRIVER_PREINIT and \c DRIVER_POST_INIT macros before and
 251  * after the initialization for driver customization.
 252  */
 253 int drm_init(struct drm_driver *driver)
 254 {
 255         struct pci_dev *pdev = NULL;
 256         struct pci_device_id *pid;
 257         int i;
 258
 259         DRM_DEBUG("\n");
 260
 261         INIT_LIST_HEAD(&driver->device_list);
 262
 263         for (i = 0; driver->pci_driver.id_table[i].vendor != 0; i++) {
 264                 pid = (struct pci_device_id *)&driver->pci_driver.id_table[i];
 265
 266                 /* Loop around setting up a DRM device for each PCI device
 267                  * matching our ID and device class.  If we had the internal
 268                  * function that pci_get_subsys and pci_get_class used, we'd
 269                  * be able to just pass pid in instead of doing a two-stage
 270                  * thing.
 271                  */
 272                 pdev = NULL;
 273                 while ((pdev =
 274                         pci_get_subsys(pid->vendor, pid->device, pid->subvendor,
 275                                        pid->subdevice, pdev)) != NULL) {
 276                         if ((pdev->class & pid->class_mask) != pid->class)
 277                                 continue;
 278
 279                         /* stealth mode requires a manual probe */
 280                         pci_dev_get(pdev);
 281                         drm_get_dev(pdev, pid, driver);
 282                 }
 283         }
 284         return 0;
 285 }
 286
 287 EXPORT_SYMBOL(drm_init);
 288
 289 /**
 290  * Called via cleanup_module() at module unload time.
 291  *
 292  * Cleans up all DRM device, calling drm_lastclose().
 293  *
 294  * \sa drm_init
 295  */
 296 static void drm_cleanup(struct drm_device * dev)
 297 {
 298         struct drm_driver *driver = dev->driver;
 299
 300         DRM_DEBUG("\n");
 301
 302         if (!dev) {
 303                 DRM_ERROR("cleanup called no dev\n");
 304                 return;
 305         }
 306
 307         drm_vblank_cleanup(dev);
 308
 309         drm_lastclose(dev);
 310
 311         if (drm_core_has_MTRR(dev) && drm_core_has_AGP(dev) &&
 312             dev->agp && dev->agp->agp_mtrr >= 0) {
 313                 int retval;
 314                 retval = mtrr_del(dev->agp->agp_mtrr,
 315                                   dev->agp->agp_info.aper_base,
 316                                   dev->agp->agp_info.aper_size * 1024 * 1024);
 317                 DRM_DEBUG("mtrr_del=%d\n", retval);
 318         }
 319
 320         if (drm_core_has_AGP(dev) && dev->agp) {
 321                 drm_free(dev->agp, sizeof(*dev->agp), DRM_MEM_AGPLISTS);
 322                 dev->agp = NULL;
 323         }
 324
 325         if (dev->driver->unload)
 326                 dev->driver->unload(dev);
 327
 328         drm_ht_remove(&dev->map_hash);
 329         drm_ctxbitmap_cleanup(dev);
 330
 331         if (drm_core_check_feature(dev, DRIVER_MODESET))
 332                 drm_put_minor(&dev->control);
 333
 334         if (driver->driver_features & DRIVER_GEM)
 335                 drm_gem_destroy(dev);
 336
 337         drm_put_minor(&dev->primary);
 338         if (drm_put_dev(dev))
 339                 DRM_ERROR("Cannot unload module\n");
 340 }
 341
 342 void drm_exit(struct drm_driver *driver)
 343 {
 344         struct drm_device *dev, *tmp;
 345         DRM_DEBUG("\n");
 346
 347         list_for_each_entry_safe(dev, tmp, &driver->device_list, driver_item)
 348                 drm_cleanup(dev);
 349
 350         DRM_INFO("Module unloaded\n");
 351 }
 352
 353 EXPORT_SYMBOL(drm_exit);
 354
 355 /** File operations structure */
 356 static const struct file_operations drm_stub_fops = {
 357         .owner = THIS_MODULE,
 358         .open = drm_stub_open
 359 };
 360
 361 static int __init drm_core_init(void)
 362 {
 363         int ret = -ENOMEM;
 364
 365         idr_init(&drm_minors_idr);
 366
 367         if (register_chrdev(DRM_MAJOR, "drm", &drm_stub_fops))
 368                 goto err_p1;
 369
 370         drm_class = drm_sysfs_create(THIS_MODULE, "drm");
 371         if (IS_ERR(drm_class)) {
 372                 printk(KERN_ERR "DRM: Error creating drm class.\n");
 373                 ret = PTR_ERR(drm_class);
 374                 goto err_p2;
 375         }
 376
 377         drm_proc_root = proc_mkdir("dri", NULL);
 378         if (!drm_proc_root) {
 379                 DRM_ERROR("Cannot create /proc/dri\n");
 380                 ret = -1;
 381                 goto err_p3;
 382         }
 383
 384         drm_mem_init();
 385
 386         DRM_INFO("Initialized %s %d.%d.%d %s\n",
 387                  CORE_NAME, CORE_MAJOR, CORE_MINOR, CORE_PATCHLEVEL, CORE_DATE);
 388         return 0;
 389 err_p3:
 390         drm_sysfs_destroy();
 391 err_p2:
 392         unregister_chrdev(DRM_MAJOR, "drm");
 393
 394         idr_destroy(&drm_minors_idr);
 395 err_p1:
 396         return ret;
 397 }
 398
 399 static void __exit drm_core_exit(void)
 400 {
 401         remove_proc_entry("dri", NULL);
 402         drm_sysfs_destroy();
 403
 404         unregister_chrdev(DRM_MAJOR, "drm");
 405
 406         idr_destroy(&drm_minors_idr);
 407 }
 408
 409 module_init(drm_core_init);
 410 module_exit(drm_core_exit);
 411
 412 /**
 413  * Get version information
 414  *
 415  * \param inode device inode.
 416  * \param filp file pointer.
 417  * \param cmd command.
 418  * \param arg user argument, pointing to a drm_version structure.
 419  * \return zero on success or negative number on failure.
 420  *
 421  * Fills in the version information in \p arg.
 422  */
 423 static int drm_version(struct drm_device *dev, void *data,
 424                        struct drm_file *file_priv)
 425 {
 426         struct drm_version *version = data;
 427         int len;
 428
 429         version->version_major = dev->driver->major;
 430         version->version_minor = dev->driver->minor;
 431         version->version_patchlevel = dev->driver->patchlevel;
 432         DRM_COPY(version->name, dev->driver->name);
 433         DRM_COPY(version->date, dev->driver->date);
 434         DRM_COPY(version->desc, dev->driver->desc);
 435
 436         return 0;
 437 }
 438
 439 /**
 440  * Called whenever a process performs an ioctl on /dev/drm.
 441  *
 442  * \param inode device inode.
 443  * \param file_priv DRM file private.
 444  * \param cmd command.
 445  * \param arg user argument.
 446  * \return zero on success or negative number on failure.
 447  *
 448  * Looks up the ioctl function in the ::ioctls table, checking for root
 449  * previleges if so required, and dispatches to the respective function.
 450  */
 451 int drm_ioctl(struct inode *inode, struct file *filp,
 452               unsigned int cmd, unsigned long arg)
 453 {
 454         struct drm_file *file_priv = filp->private_data;
 455         struct drm_device *dev = file_priv->minor->dev;
 456         struct drm_ioctl_desc *ioctl;
 457         drm_ioctl_t *func;
 458         unsigned int nr = DRM_IOCTL_NR(cmd);
 459         int retcode = -EINVAL;
 460         char *kdata = NULL;
 461
 462         atomic_inc(&dev->ioctl_count);
 463         atomic_inc(&dev->counts[_DRM_STAT_IOCTLS]);
 464         ++file_priv->ioctl_count;
 465
 466         DRM_DEBUG("pid=%d, cmd=0x%02x, nr=0x%02x, dev 0x%lx, auth=%d\n",
 467                   task_pid_nr(current), cmd, nr,
 468                   (long)old_encode_dev(file_priv->minor->device),
 469                   file_priv->authenticated);
 470
 471         if ((nr >= DRM_CORE_IOCTL_COUNT) &&
 472             ((nr < DRM_COMMAND_BASE) || (nr >= DRM_COMMAND_END)))
 473                 goto err_i1;
 474         if ((nr >= DRM_COMMAND_BASE) && (nr < DRM_COMMAND_END) &&
 475             (nr < DRM_COMMAND_BASE + dev->driver->num_ioctls))
 476                 ioctl = &dev->driver->ioctls[nr - DRM_COMMAND_BASE];
 477         else if ((nr >= DRM_COMMAND_END) || (nr < DRM_COMMAND_BASE)) {
 478                 ioctl = &drm_ioctls[nr];
 479                 cmd = ioctl->cmd;
 480         } else
 481                 goto err_i1;
 482
 483         /* Do not trust userspace, use our own definition */
 484         func = ioctl->func;
 485         /* is there a local override? */
 486         if ((nr == DRM_IOCTL_NR(DRM_IOCTL_DMA)) && dev->driver->dma_ioctl)
 487                 func = dev->driver->dma_ioctl;
 488
 489         if (!func) {
 490                 DRM_DEBUG("no function\n");
 491                 retcode = -EINVAL;
 492         } else if (((ioctl->flags & DRM_ROOT_ONLY) && !capable(CAP_SYS_ADMIN)) ||
 493                    ((ioctl->flags & DRM_AUTH) && !file_priv->authenticated) ||
 494                    ((ioctl->flags & DRM_MASTER) && !file_priv->is_master)) {
 495                 retcode = -EACCES;
 496         } else {
 497                 if (cmd & (IOC_IN | IOC_OUT)) {
 498                         kdata = kmalloc(_IOC_SIZE(cmd), GFP_KERNEL);
 499                         if (!kdata) {
 500                                 retcode = -ENOMEM;
 501                                 goto err_i1;
 502                         }
 503                 }
 504
 505                 if (cmd & IOC_IN) {
 506                         if (copy_from_user(kdata, (void __user *)arg,
 507                                            _IOC_SIZE(cmd)) != 0) {
 508                                 retcode = -EFAULT;
 509                                 goto err_i1;
 510                         }
 511                 }
 512                 retcode = func(dev, kdata, file_priv);
 513
 514                 if ((retcode == 0) && (cmd & IOC_OUT)) {
 515                         if (copy_to_user((void __user *)arg, kdata,
 516                                          _IOC_SIZE(cmd)) != 0)
 517                                 retcode = -EFAULT;
 518                 }
 519         }
 520
 521       err_i1:
 522         if (kdata)
 523                 kfree(kdata);
 524         atomic_dec(&dev->ioctl_count);
 525         if (retcode)
 526                 DRM_DEBUG("ret = %x\n", retcode);
 527         return retcode;
 528 }
 529
 530 EXPORT_SYMBOL(drm_ioctl);
 531
 532 drm_local_map_t *drm_getsarea(struct drm_device *dev)
 533 {
 534         struct drm_map_list *entry;
 535
 536         list_for_each_entry(entry, &dev->maplist, head) {
 537                 if (entry->map && entry->map->type == _DRM_SHM &&
 538                     (entry->map->flags & _DRM_CONTAINS_LOCK)) {
 539                         return entry->map;
 540                 }
 541         }
 542         return NULL;
 543 }
 544 EXPORT_SYMBOL(drm_getsarea);