sys/dev/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
  59         if (u->unique_len >= dev->unique_len) {
  60                 if (copy_to_user(u->unique, dev->unique, dev->unique_len))
  61                         return -EFAULT;
  62         }
  63         u->unique_len = dev->unique_len;
  64
  65         return 0;
  66 }
  67
  68 /*
  69  * Set the bus id.
  70  *
  71  * \param inode device inode.
  72  * \param file_priv DRM file private.
  73  * \param cmd command.
  74  * \param arg user argument, pointing to a drm_unique structure.
  75  * \return zero on success or a negative number on failure.
  76  *
  77  * Copies the bus id from userspace into drm_device::unique, and verifies that
  78  * it matches the device this DRM is attached to (EINVAL otherwise).  Deprecated
  79  * in interface version 1.1 and will return EBUSY when setversion has requested
  80  * version 1.1 or greater. Also note that KMS is all version 1.1 and later and
  81  * UMS was only ever supported on pci devices.
  82  */
  83 static int drm_setunique(struct drm_device *dev, void *data,
  84                   struct drm_file *file_priv)
  85 {
  86         struct drm_unique *u = data;
  87         int ret;
  88         int domain, bus, slot, func;
  89         char *busid;
  90
  91         if (!u->unique_len || u->unique_len > 1024)
  92                 return -EINVAL;
  93
  94         if (drm_core_check_feature(dev, DRIVER_MODESET))
  95                 return 0;
  96
  97         busid = kmalloc(u->unique_len + 1, M_DRM, M_WAITOK);
  98         if (busid == NULL)
  99                 return -ENOMEM;
 100
 101         if (copy_from_user(busid, u->unique, u->unique_len)) {
 102                 kfree(busid);
 103                 return -EFAULT;
 104         }
 105         busid[u->unique_len] = '\0';
 106
 107         /* Return error if the busid submitted doesn't match the device's actual
 108          * busid.
 109          */
 110         ret = ksscanf(busid, "PCI:%d:%d:%d", &bus, &slot, &func);
 111         if (ret != 3) {
 112                 kfree(busid);
 113                 return -EINVAL;
 114         }
 115         domain = bus >> 8;
 116         bus &= 0xff;
 117
 118         if ((domain != dev->pci_domain) ||
 119             (bus != dev->pci_bus) ||
 120             (slot != dev->pci_slot) ||
 121             (func != dev->pci_func)) {
 122                 kfree(busid);
 123                 return -EINVAL;
 124         }
 125
 126         /* Actually set the device's busid now. */
 127         DRM_LOCK(dev);
 128         if (dev->unique_len || dev->unique) {
 129                 DRM_UNLOCK(dev);
 130                 return -EBUSY;
 131         }
 132
 133         dev->unique_len = u->unique_len;
 134         dev->unique = busid;
 135         DRM_UNLOCK(dev);
 136
 137         return 0;
 138 }
 139
 140 static int drm_set_busid(struct drm_device *dev, struct drm_file *file_priv)
 141 {
 142
 143         DRM_LOCK(dev);
 144
 145         dev->unique_len = 20;
 146         dev->unique = kmalloc(dev->unique_len + 1, M_DRM, M_WAITOK | M_NULLOK);
 147         if (dev->unique == NULL) {
 148                 DRM_UNLOCK(dev);
 149                 return -ENOMEM;
 150         }
 151
 152         ksnprintf(dev->unique, dev->unique_len, "pci:%04x:%02x:%02x.%1x",
 153             dev->pci_domain, dev->pci_bus, dev->pci_slot, dev->pci_func);
 154
 155         DRM_UNLOCK(dev);
 156
 157         return 0;
 158 }
 159
 160 /*
 161  * Get client information.
 162  *
 163  * \param inode device inode.
 164  * \param file_priv DRM file private.
 165  * \param cmd command.
 166  * \param arg user argument, pointing to a drm_client structure.
 167  *
 168  * \return zero on success or a negative number on failure.
 169  *
 170  * Searches for the client with the specified index and copies its information
 171  * into userspace
 172  */
 173 static int drm_getclient(struct drm_device *dev, void *data,
 174                   struct drm_file *file_priv)
 175 {
 176         struct drm_client *client = data;
 177         struct drm_file *pt;
 178         int idx;
 179         int i = 0;
 180
 181         idx = client->idx;
 182         DRM_LOCK(dev);
 183         list_for_each_entry(pt, &dev->filelist, lhead) {
 184                 if (i++ >= idx) {
 185                         client->auth  = pt->authenticated;
 186                         client->pid   = pt->pid;
 187                         client->uid   = pt->uid;
 188                         client->magic = pt->magic;
 189                         client->iocs  = pt->ioctl_count;
 190                         DRM_UNLOCK(dev);
 191
 192                         return 0;
 193                 }
 194         }
 195         DRM_UNLOCK(dev);
 196
 197         return -EINVAL;
 198 }
 199
 200 /*
 201  * Get statistics information.
 202  *
 203  * \param inode device inode.
 204  * \param file_priv DRM file private.
 205  * \param cmd command.
 206  * \param arg user argument, pointing to a drm_stats structure.
 207  *
 208  * \return zero on success or a negative number on failure.
 209  */
 210 static int drm_getstats(struct drm_device *dev, void *data,
 211                  struct drm_file *file_priv)
 212 {
 213         struct drm_stats *stats = data;
 214
 215         /* Clear stats to prevent userspace from eating its stack garbage. */
 216         memset(stats, 0, sizeof(*stats));
 217
 218         return 0;
 219 }
 220
 221 /*
 222  * Get device/driver capabilities
 223  */
 224 static int drm_getcap(struct drm_device *dev, void *data, struct drm_file *file_priv)
 225 {
 226         struct drm_get_cap *req = data;
 227
 228         req->value = 0;
 229         switch (req->capability) {
 230         case DRM_CAP_DUMB_BUFFER:
 231                 if (dev->driver->dumb_create)
 232                         req->value = 1;
 233                 break;
 234         case DRM_CAP_VBLANK_HIGH_CRTC:
 235                 req->value = 1;
 236                 break;
 237         case DRM_CAP_DUMB_PREFERRED_DEPTH:
 238                 req->value = dev->mode_config.preferred_depth;
 239                 break;
 240         case DRM_CAP_DUMB_PREFER_SHADOW:
 241                 req->value = dev->mode_config.prefer_shadow;
 242                 break;
 243         case DRM_CAP_PRIME:
 244                 req->value |= dev->driver->prime_fd_to_handle ? DRM_PRIME_CAP_IMPORT : 0;
 245                 req->value |= dev->driver->prime_handle_to_fd ? DRM_PRIME_CAP_EXPORT : 0;
 246                 break;
 247         case DRM_CAP_TIMESTAMP_MONOTONIC:
 248                 req->value = drm_timestamp_monotonic;
 249                 break;
 250         case DRM_CAP_ASYNC_PAGE_FLIP:
 251                 req->value = dev->mode_config.async_page_flip;
 252                 break;
 253         case DRM_CAP_CURSOR_WIDTH:
 254                 if (dev->mode_config.cursor_width)
 255                         req->value = dev->mode_config.cursor_width;
 256                 else
 257                         req->value = 64;
 258                 break;
 259         case DRM_CAP_CURSOR_HEIGHT:
 260                 if (dev->mode_config.cursor_height)
 261                         req->value = dev->mode_config.cursor_height;
 262                 else
 263                         req->value = 64;
 264                 break;
 265         case DRM_CAP_ADDFB2_MODIFIERS:
 266                 req->value = dev->mode_config.allow_fb_modifiers;
 267                 break;
 268         default:
 269                 return -EINVAL;
 270         }
 271         return 0;
 272 }
 273
 274 /*
 275  * Set device/driver capabilities
 276  */
 277 static int
 278 drm_setclientcap(struct drm_device *dev, void *data, struct drm_file *file_priv)
 279 {
 280         struct drm_set_client_cap *req = data;
 281
 282         switch (req->capability) {
 283         case DRM_CLIENT_CAP_STEREO_3D:
 284                 if (req->value > 1)
 285                         return -EINVAL;
 286                 file_priv->stereo_allowed = req->value;
 287                 break;
 288         case DRM_CLIENT_CAP_UNIVERSAL_PLANES:
 289                 if (req->value > 1)
 290                         return -EINVAL;
 291                 file_priv->universal_planes = req->value;
 292                 break;
 293         case DRM_CLIENT_CAP_ATOMIC:
 294                 if (!drm_core_check_feature(dev, DRIVER_ATOMIC))
 295                         return -EINVAL;
 296                 if (req->value > 1)
 297                         return -EINVAL;
 298                 file_priv->atomic = req->value;
 299                 file_priv->universal_planes = req->value;
 300                 break;
 301         default:
 302                 return -EINVAL;
 303         }
 304
 305         return 0;
 306 }
 307
 308 /*
 309  * Setversion ioctl.
 310  *
 311  * \param inode device inode.
 312  * \param file_priv DRM file private.
 313  * \param cmd command.
 314  * \param arg user argument, pointing to a drm_lock structure.
 315  * \return zero on success or negative number on failure.
 316  *
 317  * Sets the requested interface version
 318  */
 319 static int drm_setversion(struct drm_device *dev, void *data, struct drm_file *file_priv)
 320 {
 321         struct drm_set_version *sv = data;
 322         struct drm_set_version ver;
 323         int if_version, retcode = 0;
 324
 325         /* Save the incoming data, and set the response before continuing
 326          * any further.
 327          */
 328         ver = *sv;
 329         sv->drm_di_major = DRM_IF_MAJOR;
 330         sv->drm_di_minor = DRM_IF_MINOR;
 331         sv->drm_dd_major = dev->driver->major;
 332         sv->drm_dd_minor = dev->driver->minor;
 333
 334         if (ver.drm_di_major != -1) {
 335                 if (ver.drm_di_major != DRM_IF_MAJOR ||
 336                     ver.drm_di_minor < 0 || ver.drm_di_minor > DRM_IF_MINOR) {
 337                         return -EINVAL;
 338                 }
 339                 if_version = DRM_IF_VERSION(ver.drm_di_major,
 340                     ver.drm_dd_minor);
 341                 dev->if_version = DRM_MAX(if_version, dev->if_version);
 342                 if (ver.drm_di_minor >= 1) {
 343                         /*
 344                          * Version 1.1 includes tying of DRM to specific device
 345                          * Version 1.4 has proper PCI domain support
 346                          */
 347                         retcode = drm_set_busid(dev, file_priv);
 348                         if (retcode)
 349                                 return retcode;
 350                 }
 351         }
 352
 353         if (ver.drm_dd_major != -1) {
 354                 if (ver.drm_dd_major != dev->driver->major ||
 355                     ver.drm_dd_minor < 0 ||
 356                     ver.drm_dd_minor > dev->driver->minor)
 357                 {
 358                         return -EINVAL;
 359                 }
 360         }
 361
 362         return 0;
 363 }
 364
 365 /**
 366  * drm_noop - DRM no-op ioctl implemntation
 367  * @dev: DRM device for the ioctl
 368  * @data: data pointer for the ioctl
 369  * @file_priv: DRM file for the ioctl call
 370  *
 371  * This no-op implementation for drm ioctls is useful for deprecated
 372  * functionality where we can't return a failure code because existing userspace
 373  * checks the result of the ioctl, but doesn't care about the action.
 374  *
 375  * Always returns successfully with 0.
 376  */
 377 int drm_noop(struct drm_device *dev, void *data,
 378              struct drm_file *file_priv)
 379 {
 380         DRM_DEBUG("\n");
 381         return 0;
 382 }
 383 EXPORT_SYMBOL(drm_noop);
 384
 385 /**
 386  * drm_invalid_op - DRM invalid ioctl implemntation
 387  * @dev: DRM device for the ioctl
 388  * @data: data pointer for the ioctl
 389  * @file_priv: DRM file for the ioctl call
 390  *
 391  * This no-op implementation for drm ioctls is useful for deprecated
 392  * functionality where we really don't want to allow userspace to call the ioctl
 393  * any more. This is the case for old ums interfaces for drivers that
 394  * transitioned to kms gradually and so kept the old legacy tables around. This
 395  * only applies to radeon and i915 kms drivers, other drivers shouldn't need to
 396  * use this function.
 397  *
 398  * Always fails with a return value of -EINVAL.
 399  */
 400 int drm_invalid_op(struct drm_device *dev, void *data,
 401                    struct drm_file *file_priv)
 402 {
 403         return -EINVAL;
 404 }
 405 EXPORT_SYMBOL(drm_invalid_op);
 406
 407 /*
 408  * Copy and IOCTL return string to user space
 409  */
 410 static int drm_copy_field(char __user *buf, size_t *buf_len, const char *value)
 411 {
 412         int len;
 413
 414         /* don't overflow userbuf */
 415         len = strlen(value);
 416         if (len > *buf_len)
 417                 len = *buf_len;
 418
 419         /* let userspace know exact length of driver value (which could be
 420          * larger than the userspace-supplied buffer) */
 421         *buf_len = strlen(value);
 422
 423         /* finally, try filling in the userbuf */
 424         if (len && buf)
 425                 if (copy_to_user(buf, value, len))
 426                         return -EFAULT;
 427         return 0;
 428 }
 429
 430 /*
 431  * Get version information
 432  *
 433  * \param inode device inode.
 434  * \param filp file pointer.
 435  * \param cmd command.
 436  * \param arg user argument, pointing to a drm_version structure.
 437  * \return zero on success or negative number on failure.
 438  *
 439  * Fills in the version information in \p arg.
 440  */
 441 static int drm_version(struct drm_device *dev, void *data,
 442                        struct drm_file *file_priv)
 443 {
 444         struct drm_version *version = data;
 445         int err;
 446
 447         version->version_major = dev->driver->major;
 448         version->version_minor = dev->driver->minor;
 449         version->version_patchlevel = dev->driver->patchlevel;
 450         err = drm_copy_field(version->name, &version->name_len,
 451                         dev->driver->name);
 452         if (!err)
 453                 err = drm_copy_field(version->date, &version->date_len,
 454                                 dev->driver->date);
 455         if (!err)
 456                 err = drm_copy_field(version->desc, &version->desc_len,
 457                                 dev->driver->desc);
 458
 459         return err;
 460 }
 461
 462 /*
 463  * drm_ioctl_permit - Check ioctl permissions against caller
 464  *
 465  * @flags: ioctl permission flags.
 466  * @file_priv: Pointer to struct drm_file identifying the caller.
 467  *
 468  * Checks whether the caller is allowed to run an ioctl with the
 469  * indicated permissions. If so, returns zero. Otherwise returns an
 470  * error code suitable for ioctl return.
 471  */
 472 int drm_ioctl_permit(u32 flags, struct drm_file *file_priv)
 473 {
 474         /* ROOT_ONLY is only for CAP_SYS_ADMIN */
 475         if (unlikely((flags & DRM_ROOT_ONLY) && !capable(CAP_SYS_ADMIN)))
 476                 return -EACCES;
 477
 478         /* AUTH is only for authenticated or render client */
 479         if (unlikely((flags & DRM_AUTH) && !file_priv->authenticated))
 480                 return -EACCES;
 481
 482         /* MASTER is only for master or control clients */
 483         if (unlikely((flags & DRM_MASTER) && !file_priv->master))
 484                 return -EACCES;
 485
 486         return 0;
 487 }
 488 EXPORT_SYMBOL(drm_ioctl_permit);
 489
 490 #define DRM_IOCTL_DEF(ioctl, _func, _flags)     \
 491         [DRM_IOCTL_NR(ioctl)] = {               \
 492                 .cmd = ioctl,                   \
 493                 .func = _func,                  \
 494                 .flags = _flags,                \
 495                 .name = #ioctl                  \
 496         }
 497
 498 /* Ioctl table */
 499 static const struct drm_ioctl_desc drm_ioctls[] = {
 500         DRM_IOCTL_DEF(DRM_IOCTL_VERSION, drm_version,
 501                       DRM_UNLOCKED|DRM_RENDER_ALLOW|DRM_CONTROL_ALLOW),
 502         DRM_IOCTL_DEF(DRM_IOCTL_GET_UNIQUE, drm_getunique, 0),
 503         DRM_IOCTL_DEF(DRM_IOCTL_GET_MAGIC, drm_getmagic, 0),
 504         DRM_IOCTL_DEF(DRM_IOCTL_IRQ_BUSID, drm_irq_by_busid, DRM_MASTER|DRM_ROOT_ONLY),
 505         DRM_IOCTL_DEF(DRM_IOCTL_GET_MAP, drm_legacy_getmap_ioctl, DRM_UNLOCKED),
 506         DRM_IOCTL_DEF(DRM_IOCTL_GET_CLIENT, drm_getclient, DRM_UNLOCKED),
 507         DRM_IOCTL_DEF(DRM_IOCTL_GET_STATS, drm_getstats, DRM_UNLOCKED),
 508         DRM_IOCTL_DEF(DRM_IOCTL_GET_CAP, drm_getcap, DRM_UNLOCKED|DRM_RENDER_ALLOW),
 509         DRM_IOCTL_DEF(DRM_IOCTL_SET_CLIENT_CAP, drm_setclientcap, 0),
 510         DRM_IOCTL_DEF(DRM_IOCTL_SET_VERSION, drm_setversion, DRM_MASTER),
 511
 512         DRM_IOCTL_DEF(DRM_IOCTL_SET_UNIQUE, drm_setunique, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
 513         DRM_IOCTL_DEF(DRM_IOCTL_BLOCK, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
 514         DRM_IOCTL_DEF(DRM_IOCTL_UNBLOCK, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
 515         DRM_IOCTL_DEF(DRM_IOCTL_AUTH_MAGIC, drm_authmagic, DRM_AUTH|DRM_MASTER),
 516
 517 #ifdef __DragonFly__
 518         DRM_IOCTL_DEF(DRM_IOCTL_GET_PCIINFO, drm_getpciinfo, DRM_UNLOCKED|DRM_RENDER_ALLOW),
 519 #else
 520         DRM_IOCTL_DEF(DRM_IOCTL_ADD_MAP, drm_legacy_addmap_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
 521 #endif
 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 int drm_ioctl(struct dev_ioctl_args *ap)
 631 {
 632         struct file *filp = ap->a_fp;
 633         struct drm_file *file_priv = filp->private_data;
 634         struct drm_device *dev;
 635         const struct drm_ioctl_desc *ioctl = NULL;
 636         u_long cmd = ap->a_cmd;
 637         drm_ioctl_t *func;
 638         unsigned int nr = DRM_IOCTL_NR(cmd);
 639         int retcode = 0;
 640         caddr_t data = ap->a_data;
 641         bool is_driver_ioctl;
 642
 643         dev = drm_get_device_from_kdev(ap->a_head.a_dev);
 644
 645         if (drm_device_is_unplugged(dev))
 646                 return -ENODEV;
 647
 648         is_driver_ioctl = nr >= DRM_COMMAND_BASE && nr < DRM_COMMAND_END;
 649
 650         if (IOCGROUP(cmd) != DRM_IOCTL_BASE) {
 651                 DRM_DEBUG_FIOCTL("Bad ioctl group 0x%x\n", (int)IOCGROUP(cmd));
 652                 return EINVAL;
 653         }
 654
 655         ioctl = &drm_ioctls[nr];
 656         /* It's not a core DRM ioctl, try driver-specific. */
 657         if (ioctl->func == NULL && nr >= DRM_COMMAND_BASE) {
 658                 /* The array entries begin at DRM_COMMAND_BASE ioctl nr */
 659                 nr -= DRM_COMMAND_BASE;
 660                 if (nr >= dev->driver->num_ioctls) {
 661                         return EINVAL;
 662                 }
 663                 ioctl = &dev->driver->ioctls[nr];
 664                 is_driver_ioctl = 1;
 665         }
 666
 667         DRM_DEBUG_IOCTL("pid=%d, dev=0x%lx, auth=%d, %s\n",
 668                   DRM_CURRENTPID,
 669                   (long)dev->dev,
 670                   file_priv->authenticated, ioctl->name);
 671
 672         /* Do not trust userspace, use our own definition */
 673         func = ioctl->func;
 674
 675         if (unlikely(!func)) {
 676                 DRM_DEBUG("no function\n");
 677                 retcode = -EINVAL;
 678                 goto err_i1;
 679         }
 680
 681         retcode = drm_ioctl_permit(ioctl->flags, file_priv);
 682         if (unlikely(retcode))
 683                 goto err_i1;
 684
 685         /* Enforce sane locking for kms driver ioctls. Core ioctls are
 686          * too messy still. */
 687         if (is_driver_ioctl) {
 688                 if ((ioctl->flags & DRM_UNLOCKED) == 0)
 689                         mutex_lock(&drm_global_mutex);
 690                 /* shared code returns -errno */
 691                 retcode = -func(dev, data, file_priv);
 692                 if ((ioctl->flags & DRM_UNLOCKED) == 0)
 693                         mutex_unlock(&drm_global_mutex);
 694         } else {
 695                 retcode = -func(dev, data, file_priv);
 696         }
 697         if (retcode == ERESTARTSYS)
 698                         retcode = EINTR;
 699
 700       err_i1:
 701         if (!ioctl)
 702                 DRM_DEBUG_FIOCTL("invalid ioctl: pid=%d, dev=0x%lx, auth=%d, cmd=0x%02lx, nr=0x%02x\n",
 703                           DRM_CURRENTPID,
 704                           (long)dev->dev,
 705                           file_priv->authenticated, cmd, nr);
 706
 707         if (retcode)
 708                 DRM_DEBUG_FIOCTL("ret = %d\n", retcode);
 709         return retcode;
 710 }
 711 EXPORT_SYMBOL(drm_ioctl);
 712
 713 /**
 714  * drm_ioctl_flags - Check for core ioctl and return ioctl permission flags
 715  * @nr: ioctl number
 716  * @flags: where to return the ioctl permission flags
 717  *
 718  * This ioctl is only used by the vmwgfx driver to augment the access checks
 719  * done by the drm core and insofar a pretty decent layering violation. This
 720  * shouldn't be used by any drivers.
 721  *
 722  * Returns:
 723  * True if the @nr corresponds to a DRM core ioctl numer, false otherwise.
 724  */
 725 bool drm_ioctl_flags(unsigned int nr, unsigned int *flags)
 726 {
 727         if ((nr >= DRM_COMMAND_END && nr < DRM_CORE_IOCTL_COUNT) ||
 728             (nr < DRM_COMMAND_BASE)) {
 729                 *flags = drm_ioctls[nr].flags;
 730                 return true;
 731         }
 732
 733         return false;
 734 }
 735 EXPORT_SYMBOL(drm_ioctl_flags);