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
  40 static int drm_version(struct drm_device *dev, void *data,
  41                        struct drm_file *file_priv);
  42
  43 /*
  44  * Get the bus id.
  45  *
  46  * \param inode device inode.
  47  * \param file_priv DRM file private.
  48  * \param cmd command.
  49  * \param arg user argument, pointing to a drm_unique structure.
  50  * \return zero on success or a negative number on failure.
  51  *
  52  * Copies the bus id from drm_device::unique into user space.
  53  */
  54 static int drm_getunique(struct drm_device *dev, void *data,
  55                   struct drm_file *file_priv)
  56 {
  57         struct drm_unique *u = data;
  58         struct drm_master *master = file_priv->master;
  59
  60         if (u->unique_len >= master->unique_len) {
  61                 if (copy_to_user(u->unique, master->unique, master->unique_len))
  62                         return -EFAULT;
  63         }
  64         u->unique_len = master->unique_len;
  65
  66         return 0;
  67 }
  68
  69 static void
  70 drm_unset_busid(struct drm_device *dev,
  71                 struct drm_master *master)
  72 {
  73         kfree(master->unique);
  74         master->unique = NULL;
  75         master->unique_len = 0;
  76 }
  77
  78 /*
  79  * Set the bus id.
  80  *
  81  * \param inode device inode.
  82  * \param file_priv DRM file private.
  83  * \param cmd command.
  84  * \param arg user argument, pointing to a drm_unique structure.
  85  * \return zero on success or a negative number on failure.
  86  *
  87  * Copies the bus id from userspace into drm_device::unique, and verifies that
  88  * it matches the device this DRM is attached to (EINVAL otherwise).  Deprecated
  89  * in interface version 1.1 and will return EBUSY when setversion has requested
  90  * version 1.1 or greater. Also note that KMS is all version 1.1 and later and
  91  * UMS was only ever supported on pci devices.
  92  */
  93 static int drm_setunique(struct drm_device *dev, void *data,
  94                   struct drm_file *file_priv)
  95 {
  96         struct drm_unique *u = data;
  97         struct drm_master *master = file_priv->master;
  98         int ret;
  99
 100         if (master->unique_len || master->unique)
 101                 return -EBUSY;
 102
 103         if (!u->unique_len || u->unique_len > 1024)
 104                 return -EINVAL;
 105
 106         if (drm_core_check_feature(dev, DRIVER_MODESET))
 107                 return 0;
 108
 109         if (WARN_ON(!dev->pdev))
 110                 return -EINVAL;
 111
 112         ret = drm_pci_set_unique(dev, master, u);
 113         if (ret)
 114                 goto err;
 115
 116         return 0;
 117
 118 err:
 119         drm_unset_busid(dev, master);
 120         return ret;
 121 }
 122
 123 static int drm_set_busid(struct drm_device *dev, struct drm_file *file_priv)
 124 {
 125         struct drm_master *master = file_priv->master;
 126         int ret;
 127
 128         if (master->unique != NULL)
 129                 drm_unset_busid(dev, master);
 130
 131         if (dev->driver->set_busid) {
 132                 ret = dev->driver->set_busid(dev, master);
 133                 if (ret) {
 134                         drm_unset_busid(dev, master);
 135                         return ret;
 136                 }
 137         } else {
 138                 if (WARN(dev->unique == NULL,
 139                          "No drm_driver.set_busid() implementation provided by "
 140                          "%ps. Use drm_dev_set_unique() to set the unique "
 141                          "name explicitly.", dev->driver))
 142                         return -EINVAL;
 143
 144                 master->unique = kstrdup(dev->unique, GFP_KERNEL);
 145                 if (master->unique)
 146                         master->unique_len = strlen(dev->unique);
 147         }
 148
 149         return 0;
 150 }
 151
 152 /*
 153  * Get a mapping information.
 154  *
 155  * \param inode device inode.
 156  * \param file_priv DRM file private.
 157  * \param cmd command.
 158  * \param arg user argument, pointing to a drm_map structure.
 159  *
 160  * \return zero on success or a negative number on failure.
 161  *
 162  * Searches for the mapping with the specified offset and copies its information
 163  * into userspace
 164  */
 165 static int drm_getmap(struct drm_device *dev, void *data,
 166                struct drm_file *file_priv)
 167 {
 168         struct drm_map *map = data;
 169         struct drm_map_list *r_list = NULL;
 170         struct list_head *list;
 171         int idx;
 172         int i;
 173
 174         idx = map->offset;
 175         if (idx < 0)
 176                 return -EINVAL;
 177
 178         i = 0;
 179         mutex_lock(&dev->struct_mutex);
 180         list_for_each(list, &dev->maplist) {
 181                 if (i == idx) {
 182                         r_list = list_entry(list, struct drm_map_list, head);
 183                         break;
 184                 }
 185                 i++;
 186         }
 187         if (!r_list || !r_list->map) {
 188                 mutex_unlock(&dev->struct_mutex);
 189                 return -EINVAL;
 190         }
 191
 192         map->offset = r_list->map->offset;
 193         map->size = r_list->map->size;
 194         map->type = r_list->map->type;
 195         map->flags = r_list->map->flags;
 196         map->handle = (void *)(unsigned long) r_list->user_token;
 197         map->mtrr = arch_phys_wc_index(r_list->map->mtrr);
 198
 199         mutex_unlock(&dev->struct_mutex);
 200
 201         return 0;
 202 }
 203
 204 /*
 205  * Get client information.
 206  *
 207  * \param inode device inode.
 208  * \param file_priv DRM file private.
 209  * \param cmd command.
 210  * \param arg user argument, pointing to a drm_client structure.
 211  *
 212  * \return zero on success or a negative number on failure.
 213  *
 214  * Searches for the client with the specified index and copies its information
 215  * into userspace
 216  */
 217 static int drm_getclient(struct drm_device *dev, void *data,
 218                   struct drm_file *file_priv)
 219 {
 220         struct drm_client *client = data;
 221
 222         /*
 223          * Hollowed-out getclient ioctl to keep some dead old drm tests/tools
 224          * not breaking completely. Userspace tools stop enumerating one they
 225          * get -EINVAL, hence this is the return value we need to hand back for
 226          * no clients tracked.
 227          *
 228          * Unfortunately some clients (*cough* libva *cough*) use this in a fun
 229          * attempt to figure out whether they're authenticated or not. Since
 230          * that's the only thing they care about, give it to the directly
 231          * instead of walking one giant list.
 232          */
 233         if (client->idx == 0) {
 234                 client->auth = file_priv->authenticated;
 235                 client->pid = pid_vnr(file_priv->pid);
 236                 client->uid = from_kuid_munged(current_user_ns(),
 237                                                file_priv->uid);
 238                 client->magic = 0;
 239                 client->iocs = 0;
 240
 241                 return 0;
 242         } else {
 243                 return -EINVAL;
 244         }
 245 }
 246
 247 /*
 248  * Get statistics information.
 249  *
 250  * \param inode device inode.
 251  * \param file_priv DRM file private.
 252  * \param cmd command.
 253  * \param arg user argument, pointing to a drm_stats structure.
 254  *
 255  * \return zero on success or a negative number on failure.
 256  */
 257 static int drm_getstats(struct drm_device *dev, void *data,
 258                  struct drm_file *file_priv)
 259 {
 260         struct drm_stats *stats = data;
 261
 262         /* Clear stats to prevent userspace from eating its stack garbage. */
 263         memset(stats, 0, sizeof(*stats));
 264
 265         return 0;
 266 }
 267
 268 /*
 269  * Get device/driver capabilities
 270  */
 271 static int drm_getcap(struct drm_device *dev, void *data, struct drm_file *file_priv)
 272 {
 273         struct drm_get_cap *req = data;
 274
 275         req->value = 0;
 276         switch (req->capability) {
 277         case DRM_CAP_DUMB_BUFFER:
 278                 if (dev->driver->dumb_create)
 279                         req->value = 1;
 280                 break;
 281         case DRM_CAP_VBLANK_HIGH_CRTC:
 282                 req->value = 1;
 283                 break;
 284         case DRM_CAP_DUMB_PREFERRED_DEPTH:
 285                 req->value = dev->mode_config.preferred_depth;
 286                 break;
 287         case DRM_CAP_DUMB_PREFER_SHADOW:
 288                 req->value = dev->mode_config.prefer_shadow;
 289                 break;
 290         case DRM_CAP_PRIME:
 291                 req->value |= dev->driver->prime_fd_to_handle ? DRM_PRIME_CAP_IMPORT : 0;
 292                 req->value |= dev->driver->prime_handle_to_fd ? DRM_PRIME_CAP_EXPORT : 0;
 293                 break;
 294         case DRM_CAP_TIMESTAMP_MONOTONIC:
 295                 req->value = drm_timestamp_monotonic;
 296                 break;
 297         case DRM_CAP_ASYNC_PAGE_FLIP:
 298                 req->value = dev->mode_config.async_page_flip;
 299                 break;
 300         case DRM_CAP_CURSOR_WIDTH:
 301                 if (dev->mode_config.cursor_width)
 302                         req->value = dev->mode_config.cursor_width;
 303                 else
 304                         req->value = 64;
 305                 break;
 306         case DRM_CAP_CURSOR_HEIGHT:
 307                 if (dev->mode_config.cursor_height)
 308                         req->value = dev->mode_config.cursor_height;
 309                 else
 310                         req->value = 64;
 311                 break;
 312         case DRM_CAP_ADDFB2_MODIFIERS:
 313                 req->value = dev->mode_config.allow_fb_modifiers;
 314                 break;
 315         default:
 316                 return -EINVAL;
 317         }
 318         return 0;
 319 }
 320
 321 /*
 322  * Set device/driver capabilities
 323  */
 324 static int
 325 drm_setclientcap(struct drm_device *dev, void *data, struct drm_file *file_priv)
 326 {
 327         struct drm_set_client_cap *req = data;
 328
 329         switch (req->capability) {
 330         case DRM_CLIENT_CAP_STEREO_3D:
 331                 if (req->value > 1)
 332                         return -EINVAL;
 333                 file_priv->stereo_allowed = req->value;
 334                 break;
 335         case DRM_CLIENT_CAP_UNIVERSAL_PLANES:
 336                 if (req->value > 1)
 337                         return -EINVAL;
 338                 file_priv->universal_planes = req->value;
 339                 break;
 340         case DRM_CLIENT_CAP_ATOMIC:
 341                 if (!drm_core_check_feature(dev, DRIVER_ATOMIC))
 342                         return -EINVAL;
 343                 if (req->value > 1)
 344                         return -EINVAL;
 345                 file_priv->atomic = req->value;
 346                 file_priv->universal_planes = req->value;
 347                 break;
 348         default:
 349                 return -EINVAL;
 350         }
 351
 352         return 0;
 353 }
 354
 355 /*
 356  * Setversion ioctl.
 357  *
 358  * \param inode device inode.
 359  * \param file_priv DRM file private.
 360  * \param cmd command.
 361  * \param arg user argument, pointing to a drm_lock structure.
 362  * \return zero on success or negative number on failure.
 363  *
 364  * Sets the requested interface version
 365  */
 366 static int drm_setversion(struct drm_device *dev, void *data, struct drm_file *file_priv)
 367 {
 368         struct drm_set_version *sv = data;
 369         int if_version, retcode = 0;
 370
 371         if (sv->drm_di_major != -1) {
 372                 if (sv->drm_di_major != DRM_IF_MAJOR ||
 373                     sv->drm_di_minor < 0 || sv->drm_di_minor > DRM_IF_MINOR) {
 374                         retcode = -EINVAL;
 375                         goto done;
 376                 }
 377                 if_version = DRM_IF_VERSION(sv->drm_di_major,
 378                                             sv->drm_di_minor);
 379                 dev->if_version = max(if_version, dev->if_version);
 380                 if (sv->drm_di_minor >= 1) {
 381                         /*
 382                          * Version 1.1 includes tying of DRM to specific device
 383                          * Version 1.4 has proper PCI domain support
 384                          */
 385                         retcode = drm_set_busid(dev, file_priv);
 386                         if (retcode)
 387                                 goto done;
 388                 }
 389         }
 390
 391         if (sv->drm_dd_major != -1) {
 392                 if (sv->drm_dd_major != dev->driver->major ||
 393                     sv->drm_dd_minor < 0 || sv->drm_dd_minor >
 394                     dev->driver->minor) {
 395                         retcode = -EINVAL;
 396                         goto done;
 397                 }
 398         }
 399
 400 done:
 401         sv->drm_di_major = DRM_IF_MAJOR;
 402         sv->drm_di_minor = DRM_IF_MINOR;
 403         sv->drm_dd_major = dev->driver->major;
 404         sv->drm_dd_minor = dev->driver->minor;
 405
 406         return retcode;
 407 }
 408
 409 /**
 410  * drm_noop - DRM no-op ioctl implemntation
 411  * @dev: DRM device for the ioctl
 412  * @data: data pointer for the ioctl
 413  * @file_priv: DRM file for the ioctl call
 414  *
 415  * This no-op implementation for drm ioctls is useful for deprecated
 416  * functionality where we can't return a failure code because existing userspace
 417  * checks the result of the ioctl, but doesn't care about the action.
 418  *
 419  * Always returns successfully with 0.
 420  */
 421 int drm_noop(struct drm_device *dev, void *data,
 422              struct drm_file *file_priv)
 423 {
 424         DRM_DEBUG("\n");
 425         return 0;
 426 }
 427 EXPORT_SYMBOL(drm_noop);
 428
 429 /**
 430  * drm_invalid_op - DRM invalid ioctl implemntation
 431  * @dev: DRM device for the ioctl
 432  * @data: data pointer for the ioctl
 433  * @file_priv: DRM file for the ioctl call
 434  *
 435  * This no-op implementation for drm ioctls is useful for deprecated
 436  * functionality where we really don't want to allow userspace to call the ioctl
 437  * any more. This is the case for old ums interfaces for drivers that
 438  * transitioned to kms gradually and so kept the old legacy tables around. This
 439  * only applies to radeon and i915 kms drivers, other drivers shouldn't need to
 440  * use this function.
 441  *
 442  * Always fails with a return value of -EINVAL.
 443  */
 444 int drm_invalid_op(struct drm_device *dev, void *data,
 445                    struct drm_file *file_priv)
 446 {
 447         return -EINVAL;
 448 }
 449 EXPORT_SYMBOL(drm_invalid_op);
 450
 451 /*
 452  * Copy and IOCTL return string to user space
 453  */
 454 static int drm_copy_field(char __user *buf, size_t *buf_len, const char *value)
 455 {
 456         int len;
 457
 458         /* don't overflow userbuf */
 459         len = strlen(value);
 460         if (len > *buf_len)
 461                 len = *buf_len;
 462
 463         /* let userspace know exact length of driver value (which could be
 464          * larger than the userspace-supplied buffer) */
 465         *buf_len = strlen(value);
 466
 467         /* finally, try filling in the userbuf */
 468         if (len && buf)
 469                 if (copy_to_user(buf, value, len))
 470                         return -EFAULT;
 471         return 0;
 472 }
 473
 474 /*
 475  * Get version information
 476  *
 477  * \param inode device inode.
 478  * \param filp file pointer.
 479  * \param cmd command.
 480  * \param arg user argument, pointing to a drm_version structure.
 481  * \return zero on success or negative number on failure.
 482  *
 483  * Fills in the version information in \p arg.
 484  */
 485 static int drm_version(struct drm_device *dev, void *data,
 486                        struct drm_file *file_priv)
 487 {
 488         struct drm_version *version = data;
 489         int err;
 490
 491         version->version_major = dev->driver->major;
 492         version->version_minor = dev->driver->minor;
 493         version->version_patchlevel = dev->driver->patchlevel;
 494         err = drm_copy_field(version->name, &version->name_len,
 495                         dev->driver->name);
 496         if (!err)
 497                 err = drm_copy_field(version->date, &version->date_len,
 498                                 dev->driver->date);
 499         if (!err)
 500                 err = drm_copy_field(version->desc, &version->desc_len,
 501                                 dev->driver->desc);
 502
 503         return err;
 504 }
 505
 506 /*
 507  * drm_ioctl_permit - Check ioctl permissions against caller
 508  *
 509  * @flags: ioctl permission flags.
 510  * @file_priv: Pointer to struct drm_file identifying the caller.
 511  *
 512  * Checks whether the caller is allowed to run an ioctl with the
 513  * indicated permissions. If so, returns zero. Otherwise returns an
 514  * error code suitable for ioctl return.
 515  */
 516 int drm_ioctl_permit(u32 flags, struct drm_file *file_priv)
 517 {
 518         /* ROOT_ONLY is only for CAP_SYS_ADMIN */
 519         if (unlikely((flags & DRM_ROOT_ONLY) && !capable(CAP_SYS_ADMIN)))
 520                 return -EACCES;
 521
 522         /* AUTH is only for authenticated or render client */
 523         if (unlikely((flags & DRM_AUTH) && !drm_is_render_client(file_priv) &&
 524                      !file_priv->authenticated))
 525                 return -EACCES;
 526
 527         /* MASTER is only for master or control clients */
 528         if (unlikely((flags & DRM_MASTER) && !file_priv->is_master &&
 529                      !drm_is_control_client(file_priv)))
 530                 return -EACCES;
 531
 532         /* Control clients must be explicitly allowed */
 533         if (unlikely(!(flags & DRM_CONTROL_ALLOW) &&
 534                      drm_is_control_client(file_priv)))
 535                 return -EACCES;
 536
 537         /* Render clients must be explicitly allowed */
 538         if (unlikely(!(flags & DRM_RENDER_ALLOW) &&
 539                      drm_is_render_client(file_priv)))
 540                 return -EACCES;
 541
 542         return 0;
 543 }
 544 EXPORT_SYMBOL(drm_ioctl_permit);
 545
 546 #define DRM_IOCTL_DEF(ioctl, _func, _flags)     \
 547         [DRM_IOCTL_NR(ioctl)] = {               \
 548                 .cmd = ioctl,                   \
 549                 .func = _func,                  \
 550                 .flags = _flags,                \
 551                 .name = #ioctl                  \
 552         }
 553
 554 /* Ioctl table */
 555 static const struct drm_ioctl_desc drm_ioctls[] = {
 556         DRM_IOCTL_DEF(DRM_IOCTL_VERSION, drm_version,
 557                       DRM_UNLOCKED|DRM_RENDER_ALLOW|DRM_CONTROL_ALLOW),
 558         DRM_IOCTL_DEF(DRM_IOCTL_GET_UNIQUE, drm_getunique, 0),
 559         DRM_IOCTL_DEF(DRM_IOCTL_GET_MAGIC, drm_getmagic, 0),
 560         DRM_IOCTL_DEF(DRM_IOCTL_IRQ_BUSID, drm_irq_by_busid, DRM_MASTER|DRM_ROOT_ONLY),
 561         DRM_IOCTL_DEF(DRM_IOCTL_GET_MAP, drm_getmap, DRM_UNLOCKED),
 562         DRM_IOCTL_DEF(DRM_IOCTL_GET_CLIENT, drm_getclient, DRM_UNLOCKED),
 563         DRM_IOCTL_DEF(DRM_IOCTL_GET_STATS, drm_getstats, DRM_UNLOCKED),
 564         DRM_IOCTL_DEF(DRM_IOCTL_GET_CAP, drm_getcap, DRM_UNLOCKED|DRM_RENDER_ALLOW),
 565         DRM_IOCTL_DEF(DRM_IOCTL_SET_CLIENT_CAP, drm_setclientcap, 0),
 566         DRM_IOCTL_DEF(DRM_IOCTL_SET_VERSION, drm_setversion, DRM_MASTER),
 567
 568         DRM_IOCTL_DEF(DRM_IOCTL_SET_UNIQUE, drm_setunique, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
 569         DRM_IOCTL_DEF(DRM_IOCTL_BLOCK, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
 570         DRM_IOCTL_DEF(DRM_IOCTL_UNBLOCK, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
 571         DRM_IOCTL_DEF(DRM_IOCTL_AUTH_MAGIC, drm_authmagic, DRM_AUTH|DRM_MASTER),
 572
 573         DRM_IOCTL_DEF(DRM_IOCTL_ADD_MAP, drm_legacy_addmap_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
 574         DRM_IOCTL_DEF(DRM_IOCTL_RM_MAP, drm_legacy_rmmap_ioctl, DRM_AUTH),
 575
 576         DRM_IOCTL_DEF(DRM_IOCTL_SET_SAREA_CTX, drm_legacy_setsareactx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
 577         DRM_IOCTL_DEF(DRM_IOCTL_GET_SAREA_CTX, drm_legacy_getsareactx, DRM_AUTH),
 578
 579         DRM_IOCTL_DEF(DRM_IOCTL_SET_MASTER, drm_setmaster_ioctl, DRM_ROOT_ONLY),
 580         DRM_IOCTL_DEF(DRM_IOCTL_DROP_MASTER, drm_dropmaster_ioctl, DRM_ROOT_ONLY),
 581
 582         DRM_IOCTL_DEF(DRM_IOCTL_ADD_CTX, drm_legacy_addctx, DRM_AUTH|DRM_ROOT_ONLY),
 583         DRM_IOCTL_DEF(DRM_IOCTL_RM_CTX, drm_legacy_rmctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
 584         DRM_IOCTL_DEF(DRM_IOCTL_MOD_CTX, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
 585         DRM_IOCTL_DEF(DRM_IOCTL_GET_CTX, drm_legacy_getctx, DRM_AUTH),
 586         DRM_IOCTL_DEF(DRM_IOCTL_SWITCH_CTX, drm_legacy_switchctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
 587         DRM_IOCTL_DEF(DRM_IOCTL_NEW_CTX, drm_legacy_newctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
 588         DRM_IOCTL_DEF(DRM_IOCTL_RES_CTX, drm_legacy_resctx, DRM_AUTH),
 589
 590         DRM_IOCTL_DEF(DRM_IOCTL_ADD_DRAW, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
 591         DRM_IOCTL_DEF(DRM_IOCTL_RM_DRAW, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
 592
 593         DRM_IOCTL_DEF(DRM_IOCTL_LOCK, drm_legacy_lock, DRM_AUTH),
 594         DRM_IOCTL_DEF(DRM_IOCTL_UNLOCK, drm_legacy_unlock, DRM_AUTH),
 595
 596         DRM_IOCTL_DEF(DRM_IOCTL_FINISH, drm_noop, DRM_AUTH),
 597
 598         DRM_IOCTL_DEF(DRM_IOCTL_ADD_BUFS, drm_legacy_addbufs, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
 599         DRM_IOCTL_DEF(DRM_IOCTL_MARK_BUFS, drm_legacy_markbufs, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
 600         DRM_IOCTL_DEF(DRM_IOCTL_INFO_BUFS, drm_legacy_infobufs, DRM_AUTH),
 601         DRM_IOCTL_DEF(DRM_IOCTL_MAP_BUFS, drm_legacy_mapbufs, DRM_AUTH),
 602         DRM_IOCTL_DEF(DRM_IOCTL_FREE_BUFS, drm_legacy_freebufs, DRM_AUTH),
 603         DRM_IOCTL_DEF(DRM_IOCTL_DMA, drm_legacy_dma_ioctl, DRM_AUTH),
 604
 605         DRM_IOCTL_DEF(DRM_IOCTL_CONTROL, drm_control, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
 606
 607 #if IS_ENABLED(CONFIG_AGP)
 608         DRM_IOCTL_DEF(DRM_IOCTL_AGP_ACQUIRE, drm_agp_acquire_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
 609         DRM_IOCTL_DEF(DRM_IOCTL_AGP_RELEASE, drm_agp_release_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
 610         DRM_IOCTL_DEF(DRM_IOCTL_AGP_ENABLE, drm_agp_enable_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
 611         DRM_IOCTL_DEF(DRM_IOCTL_AGP_INFO, drm_agp_info_ioctl, DRM_AUTH),
 612         DRM_IOCTL_DEF(DRM_IOCTL_AGP_ALLOC, drm_agp_alloc_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
 613         DRM_IOCTL_DEF(DRM_IOCTL_AGP_FREE, drm_agp_free_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
 614         DRM_IOCTL_DEF(DRM_IOCTL_AGP_BIND, drm_agp_bind_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
 615         DRM_IOCTL_DEF(DRM_IOCTL_AGP_UNBIND, drm_agp_unbind_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
 616 #endif
 617
 618         DRM_IOCTL_DEF(DRM_IOCTL_SG_ALLOC, drm_legacy_sg_alloc, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
 619         DRM_IOCTL_DEF(DRM_IOCTL_SG_FREE, drm_legacy_sg_free, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
 620
 621         DRM_IOCTL_DEF(DRM_IOCTL_WAIT_VBLANK, drm_wait_vblank, DRM_UNLOCKED),
 622
 623         DRM_IOCTL_DEF(DRM_IOCTL_MODESET_CTL, drm_modeset_ctl, 0),
 624
 625         DRM_IOCTL_DEF(DRM_IOCTL_UPDATE_DRAW, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
 626
 627         DRM_IOCTL_DEF(DRM_IOCTL_GEM_CLOSE, drm_gem_close_ioctl, DRM_UNLOCKED|DRM_RENDER_ALLOW),
 628         DRM_IOCTL_DEF(DRM_IOCTL_GEM_FLINK, drm_gem_flink_ioctl, DRM_AUTH|DRM_UNLOCKED),
 629         DRM_IOCTL_DEF(DRM_IOCTL_GEM_OPEN, drm_gem_open_ioctl, DRM_AUTH|DRM_UNLOCKED),
 630
 631         DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETRESOURCES, drm_mode_getresources, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 632
 633         DRM_IOCTL_DEF(DRM_IOCTL_PRIME_HANDLE_TO_FD, drm_prime_handle_to_fd_ioctl, DRM_AUTH|DRM_UNLOCKED|DRM_RENDER_ALLOW),
 634         DRM_IOCTL_DEF(DRM_IOCTL_PRIME_FD_TO_HANDLE, drm_prime_fd_to_handle_ioctl, DRM_AUTH|DRM_UNLOCKED|DRM_RENDER_ALLOW),
 635
 636         DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPLANERESOURCES, drm_mode_getplane_res, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 637         DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETCRTC, drm_mode_getcrtc, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 638         DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETCRTC, drm_mode_setcrtc, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 639         DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPLANE, drm_mode_getplane, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 640         DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETPLANE, drm_mode_setplane, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 641         DRM_IOCTL_DEF(DRM_IOCTL_MODE_CURSOR, drm_mode_cursor_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 642         DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETGAMMA, drm_mode_gamma_get_ioctl, DRM_UNLOCKED),
 643         DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETGAMMA, drm_mode_gamma_set_ioctl, DRM_MASTER|DRM_UNLOCKED),
 644         DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETENCODER, drm_mode_getencoder, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 645         DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETCONNECTOR, drm_mode_getconnector, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 646         DRM_IOCTL_DEF(DRM_IOCTL_MODE_ATTACHMODE, drm_noop, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 647         DRM_IOCTL_DEF(DRM_IOCTL_MODE_DETACHMODE, drm_noop, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 648         DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPROPERTY, drm_mode_getproperty_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 649         DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETPROPERTY, drm_mode_connector_property_set_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 650         DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPROPBLOB, drm_mode_getblob_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 651         DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETFB, drm_mode_getfb, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 652         DRM_IOCTL_DEF(DRM_IOCTL_MODE_ADDFB, drm_mode_addfb, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 653         DRM_IOCTL_DEF(DRM_IOCTL_MODE_ADDFB2, drm_mode_addfb2, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 654         DRM_IOCTL_DEF(DRM_IOCTL_MODE_RMFB, drm_mode_rmfb, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 655         DRM_IOCTL_DEF(DRM_IOCTL_MODE_PAGE_FLIP, drm_mode_page_flip_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 656         DRM_IOCTL_DEF(DRM_IOCTL_MODE_DIRTYFB, drm_mode_dirtyfb_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 657         DRM_IOCTL_DEF(DRM_IOCTL_MODE_CREATE_DUMB, drm_mode_create_dumb_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 658         DRM_IOCTL_DEF(DRM_IOCTL_MODE_MAP_DUMB, drm_mode_mmap_dumb_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 659         DRM_IOCTL_DEF(DRM_IOCTL_MODE_DESTROY_DUMB, drm_mode_destroy_dumb_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 660         DRM_IOCTL_DEF(DRM_IOCTL_MODE_OBJ_GETPROPERTIES, drm_mode_obj_get_properties_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 661         DRM_IOCTL_DEF(DRM_IOCTL_MODE_OBJ_SETPROPERTY, drm_mode_obj_set_property_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 662         DRM_IOCTL_DEF(DRM_IOCTL_MODE_CURSOR2, drm_mode_cursor2_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 663         DRM_IOCTL_DEF(DRM_IOCTL_MODE_ATOMIC, drm_mode_atomic_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 664         DRM_IOCTL_DEF(DRM_IOCTL_MODE_CREATEPROPBLOB, drm_mode_createblob_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 665         DRM_IOCTL_DEF(DRM_IOCTL_MODE_DESTROYPROPBLOB, drm_mode_destroyblob_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 666 };
 667
 668 #define DRM_CORE_IOCTL_COUNT    ARRAY_SIZE( drm_ioctls )
 669
 670 /**
 671  * drm_ioctl - ioctl callback implementation for DRM drivers
 672  * @filp: file this ioctl is called on
 673  * @cmd: ioctl cmd number
 674  * @arg: user argument
 675  *
 676  * Looks up the ioctl function in the ::ioctls table, checking for root
 677  * previleges if so required, and dispatches to the respective function.
 678  *
 679  * Returns:
 680  * Zero on success, negative error code on failure.
 681  */
 682 long drm_ioctl(struct file *filp,
 683               unsigned int cmd, unsigned long arg)
 684 {
 685         struct drm_file *file_priv = filp->private_data;
 686         struct drm_device *dev;
 687         const struct drm_ioctl_desc *ioctl = NULL;
 688         drm_ioctl_t *func;
 689         unsigned int nr = DRM_IOCTL_NR(cmd);
 690         int retcode = -EINVAL;
 691         char stack_kdata[128];
 692         char *kdata = NULL;
 693         unsigned int usize, asize, drv_size;
 694         bool is_driver_ioctl;
 695
 696         dev = file_priv->minor->dev;
 697
 698         if (drm_device_is_unplugged(dev))
 699                 return -ENODEV;
 700
 701         is_driver_ioctl = nr >= DRM_COMMAND_BASE && nr < DRM_COMMAND_END;
 702
 703         if (is_driver_ioctl) {
 704                 /* driver ioctl */
 705                 if (nr - DRM_COMMAND_BASE >= dev->driver->num_ioctls)
 706                         goto err_i1;
 707                 ioctl = &dev->driver->ioctls[nr - DRM_COMMAND_BASE];
 708         } else {
 709                 /* core ioctl */
 710                 if (nr >= DRM_CORE_IOCTL_COUNT)
 711                         goto err_i1;
 712                 ioctl = &drm_ioctls[nr];
 713         }
 714
 715         drv_size = _IOC_SIZE(ioctl->cmd);
 716         usize = _IOC_SIZE(cmd);
 717         asize = max(usize, drv_size);
 718         cmd = ioctl->cmd;
 719
 720         DRM_DEBUG("pid=%d, dev=0x%lx, auth=%d, %s\n",
 721                   task_pid_nr(current),
 722                   (long)old_encode_dev(file_priv->minor->kdev->devt),
 723                   file_priv->authenticated, ioctl->name);
 724
 725         /* Do not trust userspace, use our own definition */
 726         func = ioctl->func;
 727
 728         if (unlikely(!func)) {
 729                 DRM_DEBUG("no function\n");
 730                 retcode = -EINVAL;
 731                 goto err_i1;
 732         }
 733
 734         retcode = drm_ioctl_permit(ioctl->flags, file_priv);
 735         if (unlikely(retcode))
 736                 goto err_i1;
 737
 738         if (cmd & (IOC_IN | IOC_OUT)) {
 739                 if (asize <= sizeof(stack_kdata)) {
 740                         kdata = stack_kdata;
 741                 } else {
 742                         kdata = kmalloc(asize, GFP_KERNEL);
 743                         if (!kdata) {
 744                                 retcode = -ENOMEM;
 745                                 goto err_i1;
 746                         }
 747                 }
 748                 if (asize > usize)
 749                         memset(kdata + usize, 0, asize - usize);
 750         }
 751
 752         if (cmd & IOC_IN) {
 753                 if (copy_from_user(kdata, (void __user *)arg,
 754                                    usize) != 0) {
 755                         retcode = -EFAULT;
 756                         goto err_i1;
 757                 }
 758         } else if (cmd & IOC_OUT) {
 759                 memset(kdata, 0, usize);
 760         }
 761
 762         /* Enforce sane locking for kms driver ioctls. Core ioctls are
 763          * too messy still. */
 764         if ((drm_core_check_feature(dev, DRIVER_MODESET) && is_driver_ioctl) ||
 765             (ioctl->flags & DRM_UNLOCKED))
 766                 retcode = func(dev, kdata, file_priv);
 767         else {
 768                 mutex_lock(&drm_global_mutex);
 769                 retcode = func(dev, kdata, file_priv);
 770                 mutex_unlock(&drm_global_mutex);
 771         }
 772
 773         if (cmd & IOC_OUT) {
 774                 if (copy_to_user((void __user *)arg, kdata,
 775                                  usize) != 0)
 776                         retcode = -EFAULT;
 777         }
 778
 779       err_i1:
 780         if (!ioctl)
 781                 DRM_DEBUG("invalid ioctl: pid=%d, dev=0x%lx, auth=%d, cmd=0x%02x, nr=0x%02x\n",
 782                           task_pid_nr(current),
 783                           (long)old_encode_dev(file_priv->minor->kdev->devt),
 784                           file_priv->authenticated, cmd, nr);
 785
 786         if (kdata != stack_kdata)
 787                 kfree(kdata);
 788         if (retcode)
 789                 DRM_DEBUG("ret = %d\n", retcode);
 790         return retcode;
 791 }
 792 EXPORT_SYMBOL(drm_ioctl);
 793
 794 /**
 795  * drm_ioctl_flags - Check for core ioctl and return ioctl permission flags
 796  * @nr: ioctl number
 797  * @flags: where to return the ioctl permission flags
 798  *
 799  * This ioctl is only used by the vmwgfx driver to augment the access checks
 800  * done by the drm core and insofar a pretty decent layering violation. This
 801  * shouldn't be used by any drivers.
 802  *
 803  * Returns:
 804  * True if the @nr corresponds to a DRM core ioctl numer, false otherwise.
 805  */
 806 bool drm_ioctl_flags(unsigned int nr, unsigned int *flags)
 807 {
 808         if (nr >= DRM_COMMAND_BASE && nr < DRM_COMMAND_END)
 809                 return false;
 810
 811         if (nr >= DRM_CORE_IOCTL_COUNT)
 812                 return false;
 813
 814         *flags = drm_ioctls[nr].flags;
 815         return true;
 816 }
 817 EXPORT_SYMBOL(drm_ioctl_flags);