drivers/gpu/drm/drm_ioctl.c

   1 /*
   2  * Created: Fri Jan  8 09:01:26 1999 by faith@valinux.com
   3  *
   4  * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
   5  * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
   6  * All Rights Reserved.
   7  *
   8  * Author Rickard E. (Rik) Faith <faith@valinux.com>
   9  * Author Gareth Hughes <gareth@valinux.com>
  10  *
  11  * Permission is hereby granted, free of charge, to any person obtaining a
  12  * copy of this software and associated documentation files (the "Software"),
  13  * to deal in the Software without restriction, including without limitation
  14  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  15  * and/or sell copies of the Software, and to permit persons to whom the
  16  * Software is furnished to do so, subject to the following conditions:
  17  *
  18  * The above copyright notice and this permission notice (including the next
  19  * paragraph) shall be included in all copies or substantial portions of the
  20  * Software.
  21  *
  22  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  23  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  24  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  25  * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
  26  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  27  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  28  * OTHER DEALINGS IN THE SOFTWARE.
  29  */
  30
  31 #include <drm/drmP.h>
  32 #include <drm/drm_core.h>
  33 #include "drm_legacy.h"
  34 #include "drm_internal.h"
  35 #include "drm_crtc_internal.h"
  36
  37 #include <linux/pci.h>
  38 #include <linux/export.h>
  39 #ifdef CONFIG_X86
  40 #include <asm/mtrr.h>
  41 #endif
  42
  43 static int drm_version(struct drm_device *dev, void *data,
  44                        struct drm_file *file_priv);
  45
  46 /**
  47  * Get the bus id.
  48  *
  49  * \param inode device inode.
  50  * \param file_priv DRM file private.
  51  * \param cmd command.
  52  * \param arg user argument, pointing to a drm_unique structure.
  53  * \return zero on success or a negative number on failure.
  54  *
  55  * Copies the bus id from drm_device::unique into user space.
  56  */
  57 static int drm_getunique(struct drm_device *dev, void *data,
  58                   struct drm_file *file_priv)
  59 {
  60         struct drm_unique *u = data;
  61         struct drm_master *master = file_priv->master;
  62
  63         if (u->unique_len >= master->unique_len) {
  64                 if (copy_to_user(u->unique, master->unique, master->unique_len))
  65                         return -EFAULT;
  66         }
  67         u->unique_len = master->unique_len;
  68
  69         return 0;
  70 }
  71
  72 static void
  73 drm_unset_busid(struct drm_device *dev,
  74                 struct drm_master *master)
  75 {
  76         kfree(master->unique);
  77         master->unique = NULL;
  78         master->unique_len = 0;
  79 }
  80
  81 /**
  82  * Set the bus id.
  83  *
  84  * \param inode device inode.
  85  * \param file_priv DRM file private.
  86  * \param cmd command.
  87  * \param arg user argument, pointing to a drm_unique structure.
  88  * \return zero on success or a negative number on failure.
  89  *
  90  * Copies the bus id from userspace into drm_device::unique, and verifies that
  91  * it matches the device this DRM is attached to (EINVAL otherwise).  Deprecated
  92  * in interface version 1.1 and will return EBUSY when setversion has requested
  93  * version 1.1 or greater. Also note that KMS is all version 1.1 and later and
  94  * UMS was only ever supported on pci devices.
  95  */
  96 static int drm_setunique(struct drm_device *dev, void *data,
  97                   struct drm_file *file_priv)
  98 {
  99         struct drm_unique *u = data;
 100         struct drm_master *master = file_priv->master;
 101         int ret;
 102
 103         if (master->unique_len || master->unique)
 104                 return -EBUSY;
 105
 106         if (!u->unique_len || u->unique_len > 1024)
 107                 return -EINVAL;
 108
 109         if (drm_core_check_feature(dev, DRIVER_MODESET))
 110                 return 0;
 111
 112         if (WARN_ON(!dev->pdev))
 113                 return -EINVAL;
 114
 115         ret = drm_pci_set_unique(dev, master, u);
 116         if (ret)
 117                 goto err;
 118
 119         return 0;
 120
 121 err:
 122         drm_unset_busid(dev, master);
 123         return ret;
 124 }
 125
 126 static int drm_set_busid(struct drm_device *dev, struct drm_file *file_priv)
 127 {
 128         struct drm_master *master = file_priv->master;
 129         int ret;
 130
 131         if (master->unique != NULL)
 132                 drm_unset_busid(dev, master);
 133
 134         if (dev->driver->set_busid) {
 135                 ret = dev->driver->set_busid(dev, master);
 136                 if (ret) {
 137                         drm_unset_busid(dev, master);
 138                         return ret;
 139                 }
 140         } else {
 141                 if (WARN(dev->unique == NULL,
 142                          "No drm_driver.set_busid() implementation provided by "
 143                          "%ps. Use drm_dev_set_unique() to set the unique "
 144                          "name explicitly.", dev->driver))
 145                         return -EINVAL;
 146
 147                 master->unique = kstrdup(dev->unique, GFP_KERNEL);
 148                 if (master->unique)
 149                         master->unique_len = strlen(dev->unique);
 150         }
 151
 152         return 0;
 153 }
 154
 155 /**
 156  * Get a mapping information.
 157  *
 158  * \param inode device inode.
 159  * \param file_priv DRM file private.
 160  * \param cmd command.
 161  * \param arg user argument, pointing to a drm_map structure.
 162  *
 163  * \return zero on success or a negative number on failure.
 164  *
 165  * Searches for the mapping with the specified offset and copies its information
 166  * into userspace
 167  */
 168 static int drm_getmap(struct drm_device *dev, void *data,
 169                struct drm_file *file_priv)
 170 {
 171         struct drm_map *map = data;
 172         struct drm_map_list *r_list = NULL;
 173         struct list_head *list;
 174         int idx;
 175         int i;
 176
 177         idx = map->offset;
 178         if (idx < 0)
 179                 return -EINVAL;
 180
 181         i = 0;
 182         mutex_lock(&dev->struct_mutex);
 183         list_for_each(list, &dev->maplist) {
 184                 if (i == idx) {
 185                         r_list = list_entry(list, struct drm_map_list, head);
 186                         break;
 187                 }
 188                 i++;
 189         }
 190         if (!r_list || !r_list->map) {
 191                 mutex_unlock(&dev->struct_mutex);
 192                 return -EINVAL;
 193         }
 194
 195         map->offset = r_list->map->offset;
 196         map->size = r_list->map->size;
 197         map->type = r_list->map->type;
 198         map->flags = r_list->map->flags;
 199         map->handle = (void *)(unsigned long) r_list->user_token;
 200
 201 #ifdef CONFIG_X86
 202         /*
 203          * There appears to be exactly one user of the mtrr index: dritest.
 204          * It's easy enough to keep it working on non-PAT systems.
 205          */
 206         map->mtrr = phys_wc_to_mtrr_index(r_list->map->mtrr);
 207 #else
 208         map->mtrr = -1;
 209 #endif
 210
 211         mutex_unlock(&dev->struct_mutex);
 212
 213         return 0;
 214 }
 215
 216 /**
 217  * Get client information.
 218  *
 219  * \param inode device inode.
 220  * \param file_priv DRM file private.
 221  * \param cmd command.
 222  * \param arg user argument, pointing to a drm_client structure.
 223  *
 224  * \return zero on success or a negative number on failure.
 225  *
 226  * Searches for the client with the specified index and copies its information
 227  * into userspace
 228  */
 229 static int drm_getclient(struct drm_device *dev, void *data,
 230                   struct drm_file *file_priv)
 231 {
 232         struct drm_client *client = data;
 233
 234         /*
 235          * Hollowed-out getclient ioctl to keep some dead old drm tests/tools
 236          * not breaking completely. Userspace tools stop enumerating one they
 237          * get -EINVAL, hence this is the return value we need to hand back for
 238          * no clients tracked.
 239          *
 240          * Unfortunately some clients (*cough* libva *cough*) use this in a fun
 241          * attempt to figure out whether they're authenticated or not. Since
 242          * that's the only thing they care about, give it to the directly
 243          * instead of walking one giant list.
 244          */
 245         if (client->idx == 0) {
 246                 client->auth = file_priv->authenticated;
 247                 client->pid = pid_vnr(file_priv->pid);
 248                 client->uid = from_kuid_munged(current_user_ns(),
 249                                                file_priv->uid);
 250                 client->magic = 0;
 251                 client->iocs = 0;
 252
 253                 return 0;
 254         } else {
 255                 return -EINVAL;
 256         }
 257 }
 258
 259 /**
 260  * Get statistics information.
 261  *
 262  * \param inode device inode.
 263  * \param file_priv DRM file private.
 264  * \param cmd command.
 265  * \param arg user argument, pointing to a drm_stats structure.
 266  *
 267  * \return zero on success or a negative number on failure.
 268  */
 269 static int drm_getstats(struct drm_device *dev, void *data,
 270                  struct drm_file *file_priv)
 271 {
 272         struct drm_stats *stats = data;
 273
 274         /* Clear stats to prevent userspace from eating its stack garbage. */
 275         memset(stats, 0, sizeof(*stats));
 276
 277         return 0;
 278 }
 279
 280 /**
 281  * Get device/driver capabilities
 282  */
 283 static int drm_getcap(struct drm_device *dev, void *data, struct drm_file *file_priv)
 284 {
 285         struct drm_get_cap *req = data;
 286
 287         req->value = 0;
 288         switch (req->capability) {
 289         case DRM_CAP_DUMB_BUFFER:
 290                 if (dev->driver->dumb_create)
 291                         req->value = 1;
 292                 break;
 293         case DRM_CAP_VBLANK_HIGH_CRTC:
 294                 req->value = 1;
 295                 break;
 296         case DRM_CAP_DUMB_PREFERRED_DEPTH:
 297                 req->value = dev->mode_config.preferred_depth;
 298                 break;
 299         case DRM_CAP_DUMB_PREFER_SHADOW:
 300                 req->value = dev->mode_config.prefer_shadow;
 301                 break;
 302         case DRM_CAP_PRIME:
 303                 req->value |= dev->driver->prime_fd_to_handle ? DRM_PRIME_CAP_IMPORT : 0;
 304                 req->value |= dev->driver->prime_handle_to_fd ? DRM_PRIME_CAP_EXPORT : 0;
 305                 break;
 306         case DRM_CAP_TIMESTAMP_MONOTONIC:
 307                 req->value = drm_timestamp_monotonic;
 308                 break;
 309         case DRM_CAP_ASYNC_PAGE_FLIP:
 310                 req->value = dev->mode_config.async_page_flip;
 311                 break;
 312         case DRM_CAP_CURSOR_WIDTH:
 313                 if (dev->mode_config.cursor_width)
 314                         req->value = dev->mode_config.cursor_width;
 315                 else
 316                         req->value = 64;
 317                 break;
 318         case DRM_CAP_CURSOR_HEIGHT:
 319                 if (dev->mode_config.cursor_height)
 320                         req->value = dev->mode_config.cursor_height;
 321                 else
 322                         req->value = 64;
 323                 break;
 324         case DRM_CAP_ADDFB2_MODIFIERS:
 325                 req->value = dev->mode_config.allow_fb_modifiers;
 326                 break;
 327         default:
 328                 return -EINVAL;
 329         }
 330         return 0;
 331 }
 332
 333 /**
 334  * Set device/driver capabilities
 335  */
 336 static int
 337 drm_setclientcap(struct drm_device *dev, void *data, struct drm_file *file_priv)
 338 {
 339         struct drm_set_client_cap *req = data;
 340
 341         switch (req->capability) {
 342         case DRM_CLIENT_CAP_STEREO_3D:
 343                 if (req->value > 1)
 344                         return -EINVAL;
 345                 file_priv->stereo_allowed = req->value;
 346                 break;
 347         case DRM_CLIENT_CAP_UNIVERSAL_PLANES:
 348                 if (req->value > 1)
 349                         return -EINVAL;
 350                 file_priv->universal_planes = req->value;
 351                 break;
 352         case DRM_CLIENT_CAP_ATOMIC:
 353                 /* for now, hide behind experimental drm.atomic moduleparam */
 354                 if (!drm_atomic)
 355                         return -EINVAL;
 356                 if (!drm_core_check_feature(dev, DRIVER_ATOMIC))
 357                         return -EINVAL;
 358                 if (req->value > 1)
 359                         return -EINVAL;
 360                 file_priv->atomic = req->value;
 361                 file_priv->universal_planes = req->value;
 362                 break;
 363         default:
 364                 return -EINVAL;
 365         }
 366
 367         return 0;
 368 }
 369
 370 /**
 371  * Setversion ioctl.
 372  *
 373  * \param inode device inode.
 374  * \param file_priv DRM file private.
 375  * \param cmd command.
 376  * \param arg user argument, pointing to a drm_lock structure.
 377  * \return zero on success or negative number on failure.
 378  *
 379  * Sets the requested interface version
 380  */
 381 static int drm_setversion(struct drm_device *dev, void *data, struct drm_file *file_priv)
 382 {
 383         struct drm_set_version *sv = data;
 384         int if_version, retcode = 0;
 385
 386         if (sv->drm_di_major != -1) {
 387                 if (sv->drm_di_major != DRM_IF_MAJOR ||
 388                     sv->drm_di_minor < 0 || sv->drm_di_minor > DRM_IF_MINOR) {
 389                         retcode = -EINVAL;
 390                         goto done;
 391                 }
 392                 if_version = DRM_IF_VERSION(sv->drm_di_major,
 393                                             sv->drm_di_minor);
 394                 dev->if_version = max(if_version, dev->if_version);
 395                 if (sv->drm_di_minor >= 1) {
 396                         /*
 397                          * Version 1.1 includes tying of DRM to specific device
 398                          * Version 1.4 has proper PCI domain support
 399                          */
 400                         retcode = drm_set_busid(dev, file_priv);
 401                         if (retcode)
 402                                 goto done;
 403                 }
 404         }
 405
 406         if (sv->drm_dd_major != -1) {
 407                 if (sv->drm_dd_major != dev->driver->major ||
 408                     sv->drm_dd_minor < 0 || sv->drm_dd_minor >
 409                     dev->driver->minor) {
 410                         retcode = -EINVAL;
 411                         goto done;
 412                 }
 413         }
 414
 415 done:
 416         sv->drm_di_major = DRM_IF_MAJOR;
 417         sv->drm_di_minor = DRM_IF_MINOR;
 418         sv->drm_dd_major = dev->driver->major;
 419         sv->drm_dd_minor = dev->driver->minor;
 420
 421         return retcode;
 422 }
 423
 424 /** No-op ioctl. */
 425 int drm_noop(struct drm_device *dev, void *data,
 426              struct drm_file *file_priv)
 427 {
 428         DRM_DEBUG("\n");
 429         return 0;
 430 }
 431 EXPORT_SYMBOL(drm_noop);
 432
 433 /**
 434  * Copy and IOCTL return string to user space
 435  */
 436 static int drm_copy_field(char __user *buf, size_t *buf_len, const char *value)
 437 {
 438         int len;
 439
 440         /* don't overflow userbuf */
 441         len = strlen(value);
 442         if (len > *buf_len)
 443                 len = *buf_len;
 444
 445         /* let userspace know exact length of driver value (which could be
 446          * larger than the userspace-supplied buffer) */
 447         *buf_len = strlen(value);
 448
 449         /* finally, try filling in the userbuf */
 450         if (len && buf)
 451                 if (copy_to_user(buf, value, len))
 452                         return -EFAULT;
 453         return 0;
 454 }
 455
 456 /**
 457  * Get version information
 458  *
 459  * \param inode device inode.
 460  * \param filp file pointer.
 461  * \param cmd command.
 462  * \param arg user argument, pointing to a drm_version structure.
 463  * \return zero on success or negative number on failure.
 464  *
 465  * Fills in the version information in \p arg.
 466  */
 467 static int drm_version(struct drm_device *dev, void *data,
 468                        struct drm_file *file_priv)
 469 {
 470         struct drm_version *version = data;
 471         int err;
 472
 473         version->version_major = dev->driver->major;
 474         version->version_minor = dev->driver->minor;
 475         version->version_patchlevel = dev->driver->patchlevel;
 476         err = drm_copy_field(version->name, &version->name_len,
 477                         dev->driver->name);
 478         if (!err)
 479                 err = drm_copy_field(version->date, &version->date_len,
 480                                 dev->driver->date);
 481         if (!err)
 482                 err = drm_copy_field(version->desc, &version->desc_len,
 483                                 dev->driver->desc);
 484
 485         return err;
 486 }
 487
 488 /**
 489  * drm_ioctl_permit - Check ioctl permissions against caller
 490  *
 491  * @flags: ioctl permission flags.
 492  * @file_priv: Pointer to struct drm_file identifying the caller.
 493  *
 494  * Checks whether the caller is allowed to run an ioctl with the
 495  * indicated permissions. If so, returns zero. Otherwise returns an
 496  * error code suitable for ioctl return.
 497  */
 498 static int drm_ioctl_permit(u32 flags, struct drm_file *file_priv)
 499 {
 500         /* ROOT_ONLY is only for CAP_SYS_ADMIN */
 501         if (unlikely((flags & DRM_ROOT_ONLY) && !capable(CAP_SYS_ADMIN)))
 502                 return -EACCES;
 503
 504         /* AUTH is only for authenticated or render client */
 505         if (unlikely((flags & DRM_AUTH) && !drm_is_render_client(file_priv) &&
 506                      !file_priv->authenticated))
 507                 return -EACCES;
 508
 509         /* MASTER is only for master or control clients */
 510         if (unlikely((flags & DRM_MASTER) && !file_priv->is_master &&
 511                      !drm_is_control_client(file_priv)))
 512                 return -EACCES;
 513
 514         /* Control clients must be explicitly allowed */
 515         if (unlikely(!(flags & DRM_CONTROL_ALLOW) &&
 516                      drm_is_control_client(file_priv)))
 517                 return -EACCES;
 518
 519         /* Render clients must be explicitly allowed */
 520         if (unlikely(!(flags & DRM_RENDER_ALLOW) &&
 521                      drm_is_render_client(file_priv)))
 522                 return -EACCES;
 523
 524         return 0;
 525 }
 526
 527 #define DRM_IOCTL_DEF(ioctl, _func, _flags)     \
 528         [DRM_IOCTL_NR(ioctl)] = {               \
 529                 .cmd = ioctl,                   \
 530                 .func = _func,                  \
 531                 .flags = _flags,                \
 532                 .name = #ioctl                  \
 533         }
 534
 535 /** Ioctl table */
 536 static const struct drm_ioctl_desc drm_ioctls[] = {
 537         DRM_IOCTL_DEF(DRM_IOCTL_VERSION, drm_version, DRM_UNLOCKED|DRM_RENDER_ALLOW),
 538         DRM_IOCTL_DEF(DRM_IOCTL_GET_UNIQUE, drm_getunique, 0),
 539         DRM_IOCTL_DEF(DRM_IOCTL_GET_MAGIC, drm_getmagic, 0),
 540         DRM_IOCTL_DEF(DRM_IOCTL_IRQ_BUSID, drm_irq_by_busid, DRM_MASTER|DRM_ROOT_ONLY),
 541         DRM_IOCTL_DEF(DRM_IOCTL_GET_MAP, drm_getmap, DRM_UNLOCKED),
 542         DRM_IOCTL_DEF(DRM_IOCTL_GET_CLIENT, drm_getclient, DRM_UNLOCKED),
 543         DRM_IOCTL_DEF(DRM_IOCTL_GET_STATS, drm_getstats, DRM_UNLOCKED),
 544         DRM_IOCTL_DEF(DRM_IOCTL_GET_CAP, drm_getcap, DRM_UNLOCKED|DRM_RENDER_ALLOW),
 545         DRM_IOCTL_DEF(DRM_IOCTL_SET_CLIENT_CAP, drm_setclientcap, 0),
 546         DRM_IOCTL_DEF(DRM_IOCTL_SET_VERSION, drm_setversion, DRM_MASTER),
 547
 548         DRM_IOCTL_DEF(DRM_IOCTL_SET_UNIQUE, drm_setunique, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
 549         DRM_IOCTL_DEF(DRM_IOCTL_BLOCK, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
 550         DRM_IOCTL_DEF(DRM_IOCTL_UNBLOCK, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
 551         DRM_IOCTL_DEF(DRM_IOCTL_AUTH_MAGIC, drm_authmagic, DRM_AUTH|DRM_MASTER),
 552
 553         DRM_IOCTL_DEF(DRM_IOCTL_ADD_MAP, drm_legacy_addmap_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
 554         DRM_IOCTL_DEF(DRM_IOCTL_RM_MAP, drm_legacy_rmmap_ioctl, DRM_AUTH),
 555
 556         DRM_IOCTL_DEF(DRM_IOCTL_SET_SAREA_CTX, drm_legacy_setsareactx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
 557         DRM_IOCTL_DEF(DRM_IOCTL_GET_SAREA_CTX, drm_legacy_getsareactx, DRM_AUTH),
 558
 559         DRM_IOCTL_DEF(DRM_IOCTL_SET_MASTER, drm_setmaster_ioctl, DRM_ROOT_ONLY),
 560         DRM_IOCTL_DEF(DRM_IOCTL_DROP_MASTER, drm_dropmaster_ioctl, DRM_ROOT_ONLY),
 561
 562         DRM_IOCTL_DEF(DRM_IOCTL_ADD_CTX, drm_legacy_addctx, DRM_AUTH|DRM_ROOT_ONLY),
 563         DRM_IOCTL_DEF(DRM_IOCTL_RM_CTX, drm_legacy_rmctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
 564         DRM_IOCTL_DEF(DRM_IOCTL_MOD_CTX, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
 565         DRM_IOCTL_DEF(DRM_IOCTL_GET_CTX, drm_legacy_getctx, DRM_AUTH),
 566         DRM_IOCTL_DEF(DRM_IOCTL_SWITCH_CTX, drm_legacy_switchctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
 567         DRM_IOCTL_DEF(DRM_IOCTL_NEW_CTX, drm_legacy_newctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
 568         DRM_IOCTL_DEF(DRM_IOCTL_RES_CTX, drm_legacy_resctx, DRM_AUTH),
 569
 570         DRM_IOCTL_DEF(DRM_IOCTL_ADD_DRAW, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
 571         DRM_IOCTL_DEF(DRM_IOCTL_RM_DRAW, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
 572
 573         DRM_IOCTL_DEF(DRM_IOCTL_LOCK, drm_legacy_lock, DRM_AUTH),
 574         DRM_IOCTL_DEF(DRM_IOCTL_UNLOCK, drm_legacy_unlock, DRM_AUTH),
 575
 576         DRM_IOCTL_DEF(DRM_IOCTL_FINISH, drm_noop, DRM_AUTH),
 577
 578         DRM_IOCTL_DEF(DRM_IOCTL_ADD_BUFS, drm_legacy_addbufs, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
 579         DRM_IOCTL_DEF(DRM_IOCTL_MARK_BUFS, drm_legacy_markbufs, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
 580         DRM_IOCTL_DEF(DRM_IOCTL_INFO_BUFS, drm_legacy_infobufs, DRM_AUTH),
 581         DRM_IOCTL_DEF(DRM_IOCTL_MAP_BUFS, drm_legacy_mapbufs, DRM_AUTH),
 582         DRM_IOCTL_DEF(DRM_IOCTL_FREE_BUFS, drm_legacy_freebufs, DRM_AUTH),
 583         DRM_IOCTL_DEF(DRM_IOCTL_DMA, drm_legacy_dma_ioctl, DRM_AUTH),
 584
 585         DRM_IOCTL_DEF(DRM_IOCTL_CONTROL, drm_control, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
 586
 587 #if __OS_HAS_AGP
 588         DRM_IOCTL_DEF(DRM_IOCTL_AGP_ACQUIRE, drm_agp_acquire_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
 589         DRM_IOCTL_DEF(DRM_IOCTL_AGP_RELEASE, drm_agp_release_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
 590         DRM_IOCTL_DEF(DRM_IOCTL_AGP_ENABLE, drm_agp_enable_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
 591         DRM_IOCTL_DEF(DRM_IOCTL_AGP_INFO, drm_agp_info_ioctl, DRM_AUTH),
 592         DRM_IOCTL_DEF(DRM_IOCTL_AGP_ALLOC, drm_agp_alloc_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
 593         DRM_IOCTL_DEF(DRM_IOCTL_AGP_FREE, drm_agp_free_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
 594         DRM_IOCTL_DEF(DRM_IOCTL_AGP_BIND, drm_agp_bind_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
 595         DRM_IOCTL_DEF(DRM_IOCTL_AGP_UNBIND, drm_agp_unbind_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
 596 #endif
 597
 598         DRM_IOCTL_DEF(DRM_IOCTL_SG_ALLOC, drm_legacy_sg_alloc, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
 599         DRM_IOCTL_DEF(DRM_IOCTL_SG_FREE, drm_legacy_sg_free, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
 600
 601         DRM_IOCTL_DEF(DRM_IOCTL_WAIT_VBLANK, drm_wait_vblank, DRM_UNLOCKED),
 602
 603         DRM_IOCTL_DEF(DRM_IOCTL_MODESET_CTL, drm_modeset_ctl, 0),
 604
 605         DRM_IOCTL_DEF(DRM_IOCTL_UPDATE_DRAW, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
 606
 607         DRM_IOCTL_DEF(DRM_IOCTL_GEM_CLOSE, drm_gem_close_ioctl, DRM_UNLOCKED|DRM_RENDER_ALLOW),
 608         DRM_IOCTL_DEF(DRM_IOCTL_GEM_FLINK, drm_gem_flink_ioctl, DRM_AUTH|DRM_UNLOCKED),
 609         DRM_IOCTL_DEF(DRM_IOCTL_GEM_OPEN, drm_gem_open_ioctl, DRM_AUTH|DRM_UNLOCKED),
 610
 611         DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETRESOURCES, drm_mode_getresources, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 612
 613         DRM_IOCTL_DEF(DRM_IOCTL_PRIME_HANDLE_TO_FD, drm_prime_handle_to_fd_ioctl, DRM_AUTH|DRM_UNLOCKED|DRM_RENDER_ALLOW),
 614         DRM_IOCTL_DEF(DRM_IOCTL_PRIME_FD_TO_HANDLE, drm_prime_fd_to_handle_ioctl, DRM_AUTH|DRM_UNLOCKED|DRM_RENDER_ALLOW),
 615
 616         DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPLANERESOURCES, drm_mode_getplane_res, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 617         DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETCRTC, drm_mode_getcrtc, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 618         DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETCRTC, drm_mode_setcrtc, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 619         DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPLANE, drm_mode_getplane, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 620         DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETPLANE, drm_mode_setplane, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 621         DRM_IOCTL_DEF(DRM_IOCTL_MODE_CURSOR, drm_mode_cursor_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 622         DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETGAMMA, drm_mode_gamma_get_ioctl, DRM_UNLOCKED),
 623         DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETGAMMA, drm_mode_gamma_set_ioctl, DRM_MASTER|DRM_UNLOCKED),
 624         DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETENCODER, drm_mode_getencoder, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 625         DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETCONNECTOR, drm_mode_getconnector, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 626         DRM_IOCTL_DEF(DRM_IOCTL_MODE_ATTACHMODE, drm_noop, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 627         DRM_IOCTL_DEF(DRM_IOCTL_MODE_DETACHMODE, drm_noop, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 628         DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPROPERTY, drm_mode_getproperty_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 629         DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETPROPERTY, drm_mode_connector_property_set_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 630         DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPROPBLOB, drm_mode_getblob_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 631         DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETFB, drm_mode_getfb, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 632         DRM_IOCTL_DEF(DRM_IOCTL_MODE_ADDFB, drm_mode_addfb, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 633         DRM_IOCTL_DEF(DRM_IOCTL_MODE_ADDFB2, drm_mode_addfb2, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 634         DRM_IOCTL_DEF(DRM_IOCTL_MODE_RMFB, drm_mode_rmfb, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 635         DRM_IOCTL_DEF(DRM_IOCTL_MODE_PAGE_FLIP, drm_mode_page_flip_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 636         DRM_IOCTL_DEF(DRM_IOCTL_MODE_DIRTYFB, drm_mode_dirtyfb_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 637         DRM_IOCTL_DEF(DRM_IOCTL_MODE_CREATE_DUMB, drm_mode_create_dumb_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 638         DRM_IOCTL_DEF(DRM_IOCTL_MODE_MAP_DUMB, drm_mode_mmap_dumb_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 639         DRM_IOCTL_DEF(DRM_IOCTL_MODE_DESTROY_DUMB, drm_mode_destroy_dumb_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 640         DRM_IOCTL_DEF(DRM_IOCTL_MODE_OBJ_GETPROPERTIES, drm_mode_obj_get_properties_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 641         DRM_IOCTL_DEF(DRM_IOCTL_MODE_OBJ_SETPROPERTY, drm_mode_obj_set_property_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 642         DRM_IOCTL_DEF(DRM_IOCTL_MODE_CURSOR2, drm_mode_cursor2_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 643         DRM_IOCTL_DEF(DRM_IOCTL_MODE_ATOMIC, drm_mode_atomic_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 644 };
 645
 646 #define DRM_CORE_IOCTL_COUNT    ARRAY_SIZE( drm_ioctls )
 647
 648 /**
 649  * Called whenever a process performs an ioctl on /dev/drm.
 650  *
 651  * \param inode device inode.
 652  * \param file_priv DRM file private.
 653  * \param cmd command.
 654  * \param arg user argument.
 655  * \return zero on success or negative number on failure.
 656  *
 657  * Looks up the ioctl function in the ::ioctls table, checking for root
 658  * previleges if so required, and dispatches to the respective function.
 659  */
 660 long drm_ioctl(struct file *filp,
 661               unsigned int cmd, unsigned long arg)
 662 {
 663         struct drm_file *file_priv = filp->private_data;
 664         struct drm_device *dev;
 665         const struct drm_ioctl_desc *ioctl = NULL;
 666         drm_ioctl_t *func;
 667         unsigned int nr = DRM_IOCTL_NR(cmd);
 668         int retcode = -EINVAL;
 669         char stack_kdata[128];
 670         char *kdata = NULL;
 671         unsigned int usize, asize, drv_size;
 672
 673         dev = file_priv->minor->dev;
 674
 675         if (drm_device_is_unplugged(dev))
 676                 return -ENODEV;
 677
 678         if (nr >= DRM_COMMAND_BASE && nr < DRM_COMMAND_END) {
 679                 /* driver ioctl */
 680                 if (nr - DRM_COMMAND_BASE >= dev->driver->num_ioctls)
 681                         goto err_i1;
 682                 ioctl = &dev->driver->ioctls[nr - DRM_COMMAND_BASE];
 683         } else {
 684                 /* core ioctl */
 685                 if (nr >= DRM_CORE_IOCTL_COUNT)
 686                         goto err_i1;
 687                 ioctl = &drm_ioctls[nr];
 688         }
 689
 690         drv_size = _IOC_SIZE(ioctl->cmd);
 691         usize = _IOC_SIZE(cmd);
 692         asize = max(usize, drv_size);
 693         cmd = ioctl->cmd;
 694
 695         DRM_DEBUG("pid=%d, dev=0x%lx, auth=%d, %s\n",
 696                   task_pid_nr(current),
 697                   (long)old_encode_dev(file_priv->minor->kdev->devt),
 698                   file_priv->authenticated, ioctl->name);
 699
 700         /* Do not trust userspace, use our own definition */
 701         func = ioctl->func;
 702
 703         if (unlikely(!func)) {
 704                 DRM_DEBUG("no function\n");
 705                 retcode = -EINVAL;
 706                 goto err_i1;
 707         }
 708
 709         retcode = drm_ioctl_permit(ioctl->flags, file_priv);
 710         if (unlikely(retcode))
 711                 goto err_i1;
 712
 713         if (cmd & (IOC_IN | IOC_OUT)) {
 714                 if (asize <= sizeof(stack_kdata)) {
 715                         kdata = stack_kdata;
 716                 } else {
 717                         kdata = kmalloc(asize, GFP_KERNEL);
 718                         if (!kdata) {
 719                                 retcode = -ENOMEM;
 720                                 goto err_i1;
 721                         }
 722                 }
 723                 if (asize > usize)
 724                         memset(kdata + usize, 0, asize - usize);
 725         }
 726
 727         if (cmd & IOC_IN) {
 728                 if (copy_from_user(kdata, (void __user *)arg,
 729                                    usize) != 0) {
 730                         retcode = -EFAULT;
 731                         goto err_i1;
 732                 }
 733         } else if (cmd & IOC_OUT) {
 734                 memset(kdata, 0, usize);
 735         }
 736
 737         if (ioctl->flags & DRM_UNLOCKED)
 738                 retcode = func(dev, kdata, file_priv);
 739         else {
 740                 mutex_lock(&drm_global_mutex);
 741                 retcode = func(dev, kdata, file_priv);
 742                 mutex_unlock(&drm_global_mutex);
 743         }
 744
 745         if (cmd & IOC_OUT) {
 746                 if (copy_to_user((void __user *)arg, kdata,
 747                                  usize) != 0)
 748                         retcode = -EFAULT;
 749         }
 750
 751       err_i1:
 752         if (!ioctl)
 753                 DRM_DEBUG("invalid ioctl: pid=%d, dev=0x%lx, auth=%d, cmd=0x%02x, nr=0x%02x\n",
 754                           task_pid_nr(current),
 755                           (long)old_encode_dev(file_priv->minor->kdev->devt),
 756                           file_priv->authenticated, cmd, nr);
 757
 758         if (kdata != stack_kdata)
 759                 kfree(kdata);
 760         if (retcode)
 761                 DRM_DEBUG("ret = %d\n", retcode);
 762         return retcode;
 763 }
 764 EXPORT_SYMBOL(drm_ioctl);
 765
 766 /**
 767  * drm_ioctl_flags - Check for core ioctl and return ioctl permission flags
 768  *
 769  * @nr: Ioctl number.
 770  * @flags: Where to return the ioctl permission flags
 771  */
 772 bool drm_ioctl_flags(unsigned int nr, unsigned int *flags)
 773 {
 774         if (nr >= DRM_COMMAND_BASE && nr < DRM_COMMAND_END)
 775                 return false;
 776
 777         if (nr >= DRM_CORE_IOCTL_COUNT)
 778                 return false;
 779
 780         *flags = drm_ioctls[nr].flags;
 781         return true;
 782 }
 783 EXPORT_SYMBOL(drm_ioctl_flags);