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