LXR linux/drivers/gpu/drm/drm

   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
  54static int drm_version(struct drm_device *dev, void *data,
  55                       struct drm_file *file_priv);
  56
  57/** Ioctl table */
  58static 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),
  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),
  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 */
 161int 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                        kfree(entry);
 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                kfree(vma);
 212        }
 213
 214        if (drm_core_check_feature(dev, DRIVER_DMA_QUEUE) && dev->queuelist) {
 215                for (i = 0; i < dev->queue_count; i++) {
 216                        kfree(dev->queuelist[i]);
 217                        dev->queuelist[i] = NULL;
 218                }
 219                kfree(dev->queuelist);
 220                dev->queuelist = NULL;
 221        }
 222        dev->queue_count = 0;
 223
 224        if (drm_core_check_feature(dev, DRIVER_HAVE_DMA) &&
 225            !drm_core_check_feature(dev, DRIVER_MODESET))
 226                drm_dma_takedown(dev);
 227
 228        dev->dev_mapping = NULL;
 229        mutex_unlock(&dev->struct_mutex);
 230
 231        DRM_DEBUG("lastclose completed\n");
 232        return 0;
 233}
 234
 235/**
 236 * Module initialization. Called via init_module at module load time, or via
 237 * linux/init/main.c (this is not currently supported).
 238 *
 239 * \return zero on success or a negative number on failure.
 240 *
 241 * Initializes an array of drm_device structures, and attempts to
 242 * initialize all available devices, using consecutive minors, registering the
 243 * stubs and initializing the AGP device.
 244 *
 245 * Expands the \c DRIVER_PREINIT and \c DRIVER_POST_INIT macros before and
 246 * after the initialization for driver customization.
 247 */
 248int drm_init(struct drm_driver *driver)
 249{
 250        struct pci_dev *pdev = NULL;
 251        const struct pci_device_id *pid;
 252        int i;
 253
 254        DRM_DEBUG("\n");
 255
 256        INIT_LIST_HEAD(&driver->device_list);
 257
 258        if (driver->driver_features & DRIVER_MODESET)
 259                return pci_register_driver(&driver->pci_driver);
 260
 261        /* If not using KMS, fall back to stealth mode manual scanning. */
 262        for (i = 0; driver->pci_driver.id_table[i].vendor != 0; i++) {
 263                pid = &driver->pci_driver.id_table[i];
 264
 265                /* Loop around setting up a DRM device for each PCI device
 266                 * matching our ID and device class.  If we had the internal
 267                 * function that pci_get_subsys and pci_get_class used, we'd
 268                 * be able to just pass pid in instead of doing a two-stage
 269                 * thing.
 270                 */
 271                pdev = NULL;
 272                while ((pdev =
 273                        pci_get_subsys(pid->vendor, pid->device, pid->subvendor,
 274                                       pid->subdevice, pdev)) != NULL) {
 275                        if ((pdev->class & pid->class_mask) != pid->class)
 276                                continue;
 277
 278                        /* stealth mode requires a manual probe */
 279                        pci_dev_get(pdev);
 280                        drm_get_dev(pdev, pid, driver);
 281                }
 282        }
 283        return 0;
 284}
 285
 286EXPORT_SYMBOL(drm_init);
 287
 288void drm_exit(struct drm_driver *driver)
 289{
 290        struct drm_device *dev, *tmp;
 291        DRM_DEBUG("\n");
 292
 293        if (driver->driver_features & DRIVER_MODESET) {
 294                pci_unregister_driver(&driver->pci_driver);
 295        } else {
 296                list_for_each_entry_safe(dev, tmp, &driver->device_list, driver_item)
 297                        drm_put_dev(dev);
 298        }
 299
 300        DRM_INFO("Module unloaded\n");
 301}
 302
 303EXPORT_SYMBOL(drm_exit);
 304
 305/** File operations structure */
 306static const struct file_operations drm_stub_fops = {
 307        .owner = THIS_MODULE,
 308        .open = drm_stub_open
 309};
 310
 311static int __init drm_core_init(void)
 312{
 313        int ret = -ENOMEM;
 314
 315        idr_init(&drm_minors_idr);
 316
 317        if (register_chrdev(DRM_MAJOR, "drm", &drm_stub_fops))
 318                goto err_p1;
 319
 320        drm_class = drm_sysfs_create(THIS_MODULE, "drm");
 321        if (IS_ERR(drm_class)) {
 322                printk(KERN_ERR "DRM: Error creating drm class.\n");
 323                ret = PTR_ERR(drm_class);
 324                goto err_p2;
 325        }
 326
 327        drm_proc_root = proc_mkdir("dri", NULL);
 328        if (!drm_proc_root) {
 329                DRM_ERROR("Cannot create /proc/dri\n");
 330                ret = -1;
 331                goto err_p3;
 332        }
 333
 334        drm_debugfs_root = debugfs_create_dir("dri", NULL);
 335        if (!drm_debugfs_root) {
 336                DRM_ERROR("Cannot create /sys/kernel/debug/dri\n");
 337                ret = -1;
 338                goto err_p3;
 339        }
 340
 341        DRM_INFO("Initialized %s %d.%d.%d %s\n",
 342                 CORE_NAME, CORE_MAJOR, CORE_MINOR, CORE_PATCHLEVEL, CORE_DATE);
 343        return 0;
 344err_p3:
 345        drm_sysfs_destroy();
 346err_p2:
 347        unregister_chrdev(DRM_MAJOR, "drm");
 348
 349        idr_destroy(&drm_minors_idr);
 350err_p1:
 351        return ret;
 352}
 353
 354static void __exit drm_core_exit(void)
 355{
 356        remove_proc_entry("dri", NULL);
 357        debugfs_remove(drm_debugfs_root);
 358        drm_sysfs_destroy();
 359
 360        unregister_chrdev(DRM_MAJOR, "drm");
 361
 362        idr_destroy(&drm_minors_idr);
 363}
 364
 365module_init(drm_core_init);
 366module_exit(drm_core_exit);
 367
 368/**
 369 * Get version information
 370 *
 371 * \param inode device inode.
 372 * \param filp file pointer.
 373 * \param cmd command.
 374 * \param arg user argument, pointing to a drm_version structure.
 375 * \return zero on success or negative number on failure.
 376 *
 377 * Fills in the version information in \p arg.
 378 */
 379static int drm_version(struct drm_device *dev, void *data,
 380                       struct drm_file *file_priv)
 381{
 382        struct drm_version *version = data;
 383        int len;
 384
 385        version->version_major = dev->driver->major;
 386        version->version_minor = dev->driver->minor;
 387        version->version_patchlevel = dev->driver->patchlevel;
 388        DRM_COPY(version->name, dev->driver->name);
 389        DRM_COPY(version->date, dev->driver->date);
 390        DRM_COPY(version->desc, dev->driver->desc);
 391
 392        return 0;
 393}
 394
 395/**
 396 * Called whenever a process performs an ioctl on /dev/drm.
 397 *
 398 * \param inode device inode.
 399 * \param file_priv DRM file private.
 400 * \param cmd command.
 401 * \param arg user argument.
 402 * \return zero on success or negative number on failure.
 403 *
 404 * Looks up the ioctl function in the ::ioctls table, checking for root
 405 * previleges if so required, and dispatches to the respective function.
 406 */
 407int drm_ioctl(struct inode *inode, struct file *filp,
 408              unsigned int cmd, unsigned long arg)
 409{
 410        struct drm_file *file_priv = filp->private_data;
 411        struct drm_device *dev = file_priv->minor->dev;
 412        struct drm_ioctl_desc *ioctl;
 413        drm_ioctl_t *func;
 414        unsigned int nr = DRM_IOCTL_NR(cmd);
 415        int retcode = -EINVAL;
 416        char stack_kdata[128];
 417        char *kdata = NULL;
 418
 419        atomic_inc(&dev->ioctl_count);
 420        atomic_inc(&dev->counts[_DRM_STAT_IOCTLS]);
 421        ++file_priv->ioctl_count;
 422
 423        DRM_DEBUG("pid=%d, cmd=0x%02x, nr=0x%02x, dev 0x%lx, auth=%d\n",
 424                  task_pid_nr(current), cmd, nr,
 425                  (long)old_encode_dev(file_priv->minor->device),
 426                  file_priv->authenticated);
 427
 428        if ((nr >= DRM_CORE_IOCTL_COUNT) &&
 429            ((nr < DRM_COMMAND_BASE) || (nr >= DRM_COMMAND_END)))
 430                goto err_i1;
 431        if ((nr >= DRM_COMMAND_BASE) && (nr < DRM_COMMAND_END) &&
 432            (nr < DRM_COMMAND_BASE + dev->driver->num_ioctls))
 433                ioctl = &dev->driver->ioctls[nr - DRM_COMMAND_BASE];
 434        else if ((nr >= DRM_COMMAND_END) || (nr < DRM_COMMAND_BASE)) {
 435                ioctl = &drm_ioctls[nr];
 436                cmd = ioctl->cmd;
 437        } else
 438                goto err_i1;
 439
 440        /* Do not trust userspace, use our own definition */
 441        func = ioctl->func;
 442        /* is there a local override? */
 443        if ((nr == DRM_IOCTL_NR(DRM_IOCTL_DMA)) && dev->driver->dma_ioctl)
 444                func = dev->driver->dma_ioctl;
 445
 446        if (!func) {
 447                DRM_DEBUG("no function\n");
 448                retcode = -EINVAL;
 449        } else if (((ioctl->flags & DRM_ROOT_ONLY) && !capable(CAP_SYS_ADMIN)) ||
 450                   ((ioctl->flags & DRM_AUTH) && !file_priv->authenticated) ||
 451                   ((ioctl->flags & DRM_MASTER) && !file_priv->is_master) ||
 452                   (!(ioctl->flags & DRM_CONTROL_ALLOW) && (file_priv->minor->type == DRM_MINOR_CONTROL))) {
 453                retcode = -EACCES;
 454        } else {
 455                if (cmd & (IOC_IN | IOC_OUT)) {
 456                        if (_IOC_SIZE(cmd) <= sizeof(stack_kdata)) {
 457                                kdata = stack_kdata;
 458                        } else {
 459                                kdata = kmalloc(_IOC_SIZE(cmd), GFP_KERNEL);
 460                                if (!kdata) {
 461                                        retcode = -ENOMEM;
 462                                        goto err_i1;
 463                                }
 464                        }
 465                }
 466
 467                if (cmd & IOC_IN) {
 468                        if (copy_from_user(kdata, (void __user *)arg,
 469                                           _IOC_SIZE(cmd)) != 0) {
 470                                retcode = -EFAULT;
 471                                goto err_i1;
 472                        }
 473                }
 474                retcode = func(dev, kdata, file_priv);
 475
 476                if (cmd & IOC_OUT) {
 477                        if (copy_to_user((void __user *)arg, kdata,
 478                                         _IOC_SIZE(cmd)) != 0)
 479                                retcode = -EFAULT;
 480                }
 481        }
 482
 483      err_i1:
 484        if (kdata != stack_kdata)
 485                kfree(kdata);
 486        atomic_dec(&dev->ioctl_count);
 487        if (retcode)
 488                DRM_DEBUG("ret = %x\n", retcode);
 489        return retcode;
 490}
 491
 492EXPORT_SYMBOL(drm_ioctl);
 493
 494struct drm_local_map *drm_getsarea(struct drm_device *dev)
 495{
 496        struct drm_map_list *entry;
 497
 498        list_for_each_entry(entry, &dev->maplist, head) {
 499                if (entry->map && entry->map->type == _DRM_SHM &&
 500                    (entry->map->flags & _DRM_CONTAINS_LOCK)) {
 501                        return entry->map;
 502                }
 503        }
 504        return NULL;
 505}
 506EXPORT_SYMBOL(drm_getsarea);
 507