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 <sys/devfs.h>
  32
  33 #include <drm/drmP.h>
  34 #include <drm/drm_core.h>
  35 #include "drm_legacy.h"
  36 #include "drm_internal.h"
  37 #include "drm_crtc_internal.h"
  38
  39 #include <linux/export.h>
  40
  41 static int drm_version(struct drm_device *dev, void *data,
  42                        struct drm_file *file_priv);
  43
  44 /*
  45  * Get the bus id.
  46  *
  47  * \param inode device inode.
  48  * \param file_priv DRM file private.
  49  * \param cmd command.
  50  * \param arg user argument, pointing to a drm_unique structure.
  51  * \return zero on success or a negative number on failure.
  52  *
  53  * Copies the bus id from drm_device::unique into user space.
  54  */
  55 static int drm_getunique(struct drm_device *dev, void *data,
  56                   struct drm_file *file_priv)
  57 {
  58         struct drm_unique *u = data;
  59
  60         if (u->unique_len >= dev->unique_len) {
  61                 if (copy_to_user(u->unique, dev->unique, dev->unique_len))
  62                         return -EFAULT;
  63         }
  64         u->unique_len = dev->unique_len;
  65
  66         return 0;
  67 }
  68
  69 /*
  70  * Set the bus id.
  71  *
  72  * \param inode device inode.
  73  * \param file_priv DRM file private.
  74  * \param cmd command.
  75  * \param arg user argument, pointing to a drm_unique structure.
  76  * \return zero on success or a negative number on failure.
  77  *
  78  * Copies the bus id from userspace into drm_device::unique, and verifies that
  79  * it matches the device this DRM is attached to (EINVAL otherwise).  Deprecated
  80  * in interface version 1.1 and will return EBUSY when setversion has requested
  81  * version 1.1 or greater.
  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 domain, bus, slot, func, ret;
  88         char *busid;
  89
  90         /* Check and copy in the submitted Bus ID */
  91         if (!u->unique_len || u->unique_len > 1024)
  92                 return -EINVAL;
  93
  94         busid = kmalloc(u->unique_len + 1, M_DRM, M_WAITOK);
  95         if (busid == NULL)
  96                 return -ENOMEM;
  97
  98         if (copy_from_user(busid, u->unique, u->unique_len)) {
  99                 kfree(busid);
 100                 return -EFAULT;
 101         }
 102         busid[u->unique_len] = '\0';
 103
 104         /* Return error if the busid submitted doesn't match the device's actual
 105          * busid.
 106          */
 107         ret = ksscanf(busid, "PCI:%d:%d:%d", &bus, &slot, &func);
 108         if (ret != 3) {
 109                 kfree(busid);
 110                 return -EINVAL;
 111         }
 112         domain = bus >> 8;
 113         bus &= 0xff;
 114
 115         if ((domain != dev->pci_domain) ||
 116             (bus != dev->pci_bus) ||
 117             (slot != dev->pci_slot) ||
 118             (func != dev->pci_func)) {
 119                 kfree(busid);
 120                 return -EINVAL;
 121         }
 122
 123         /* Actually set the device's busid now. */
 124         DRM_LOCK(dev);
 125         if (dev->unique_len || dev->unique) {
 126                 DRM_UNLOCK(dev);
 127                 return -EBUSY;
 128         }
 129
 130         dev->unique_len = u->unique_len;
 131         dev->unique = busid;
 132         DRM_UNLOCK(dev);
 133
 134         return 0;
 135 }
 136
 137 static int drm_set_busid(struct drm_device *dev, struct drm_file *file_priv)
 138 {
 139
 140         DRM_LOCK(dev);
 141
 142         dev->unique_len = 20;
 143         dev->unique = kmalloc(dev->unique_len + 1, M_DRM, M_WAITOK | M_NULLOK);
 144         if (dev->unique == NULL) {
 145                 DRM_UNLOCK(dev);
 146                 return -ENOMEM;
 147         }
 148
 149         ksnprintf(dev->unique, dev->unique_len, "pci:%04x:%02x:%02x.%1x",
 150             dev->pci_domain, dev->pci_bus, dev->pci_slot, dev->pci_func);
 151
 152         DRM_UNLOCK(dev);
 153
 154         return 0;
 155 }
 156
 157 /*
 158  * Get client information.
 159  *
 160  * \param inode device inode.
 161  * \param file_priv DRM file private.
 162  * \param cmd command.
 163  * \param arg user argument, pointing to a drm_client structure.
 164  *
 165  * \return zero on success or a negative number on failure.
 166  *
 167  * Searches for the client with the specified index and copies its information
 168  * into userspace
 169  */
 170 static int drm_getclient(struct drm_device *dev, void *data,
 171                   struct drm_file *file_priv)
 172 {
 173         struct drm_client *client = data;
 174         struct drm_file *pt;
 175         int idx;
 176         int i = 0;
 177
 178         idx = client->idx;
 179         DRM_LOCK(dev);
 180         list_for_each_entry(pt, &dev->filelist, lhead) {
 181                 if (i++ >= idx) {
 182                         client->auth  = pt->authenticated;
 183                         client->pid   = pt->pid;
 184                         client->uid   = pt->uid;
 185                         client->magic = pt->magic;
 186                         client->iocs  = pt->ioctl_count;
 187                         DRM_UNLOCK(dev);
 188
 189                         return 0;
 190                 }
 191         }
 192         DRM_UNLOCK(dev);
 193
 194         return -EINVAL;
 195 }
 196
 197 /*
 198  * Get statistics information.
 199  *
 200  * \param inode device inode.
 201  * \param file_priv DRM file private.
 202  * \param cmd command.
 203  * \param arg user argument, pointing to a drm_stats structure.
 204  *
 205  * \return zero on success or a negative number on failure.
 206  */
 207 static int drm_getstats(struct drm_device *dev, void *data,
 208                  struct drm_file *file_priv)
 209 {
 210         struct drm_stats *stats = data;
 211         int          i;
 212
 213         memset(stats, 0, sizeof(struct drm_stats));
 214
 215         DRM_LOCK(dev);
 216
 217         for (i = 0; i < dev->counters; i++) {
 218                 if (dev->types[i] == _DRM_STAT_LOCK)
 219                         stats->data[i].value =
 220                             (dev->lock.hw_lock ? dev->lock.hw_lock->lock : 0);
 221                 else
 222                         stats->data[i].value = atomic_read(&dev->counts[i]);
 223                 stats->data[i].type = dev->types[i];
 224         }
 225
 226         stats->count = dev->counters;
 227
 228         DRM_UNLOCK(dev);
 229
 230         return 0;
 231 }
 232
 233 /*
 234  * Get device/driver capabilities
 235  */
 236 static int drm_getcap(struct drm_device *dev, void *data, struct drm_file *file_priv)
 237 {
 238         struct drm_get_cap *req = data;
 239
 240         req->value = 0;
 241         switch (req->capability) {
 242         case DRM_CAP_DUMB_BUFFER:
 243                 if (dev->driver->dumb_create)
 244                         req->value = 1;
 245                 break;
 246         case DRM_CAP_VBLANK_HIGH_CRTC:
 247                 req->value = 1;
 248                 break;
 249         case DRM_CAP_DUMB_PREFERRED_DEPTH:
 250                 req->value = dev->mode_config.preferred_depth;
 251                 break;
 252         case DRM_CAP_DUMB_PREFER_SHADOW:
 253                 req->value = dev->mode_config.prefer_shadow;
 254                 break;
 255         case DRM_CAP_TIMESTAMP_MONOTONIC:
 256                 req->value = drm_timestamp_monotonic;
 257                 break;
 258         case DRM_CAP_ASYNC_PAGE_FLIP:
 259                 req->value = dev->mode_config.async_page_flip;
 260                 break;
 261         case DRM_CAP_CURSOR_WIDTH:
 262                 if (dev->mode_config.cursor_width)
 263                         req->value = dev->mode_config.cursor_width;
 264                 else
 265                         req->value = 64;
 266                 break;
 267         case DRM_CAP_CURSOR_HEIGHT:
 268                 if (dev->mode_config.cursor_height)
 269                         req->value = dev->mode_config.cursor_height;
 270                 else
 271                         req->value = 64;
 272                 break;
 273         default:
 274                 return -EINVAL;
 275         }
 276         return 0;
 277 }
 278
 279 /*
 280  * Set device/driver capabilities
 281  */
 282 static int
 283 drm_setclientcap(struct drm_device *dev, void *data, struct drm_file *file_priv)
 284 {
 285         struct drm_set_client_cap *req = data;
 286
 287         switch (req->capability) {
 288         case DRM_CLIENT_CAP_STEREO_3D:
 289                 if (req->value > 1)
 290                         return -EINVAL;
 291                 file_priv->stereo_allowed = req->value;
 292                 break;
 293         case DRM_CLIENT_CAP_UNIVERSAL_PLANES:
 294                 if (req->value > 1)
 295                         return -EINVAL;
 296                 file_priv->universal_planes = req->value;
 297                 break;
 298         case DRM_CLIENT_CAP_ATOMIC:
 299                 if (!drm_core_check_feature(dev, DRIVER_ATOMIC))
 300                         return -EINVAL;
 301                 if (req->value > 1)
 302                         return -EINVAL;
 303                 file_priv->atomic = req->value;
 304                 file_priv->universal_planes = req->value;
 305                 break;
 306         default:
 307                 return -EINVAL;
 308         }
 309
 310         return 0;
 311 }
 312
 313 /*
 314  * Setversion ioctl.
 315  *
 316  * \param inode device inode.
 317  * \param file_priv DRM file private.
 318  * \param cmd command.
 319  * \param arg user argument, pointing to a drm_lock structure.
 320  * \return zero on success or negative number on failure.
 321  *
 322  * Sets the requested interface version
 323  */
 324 static int drm_setversion(struct drm_device *dev, void *data, struct drm_file *file_priv)
 325 {
 326         struct drm_set_version *sv = data;
 327         struct drm_set_version ver;
 328         int if_version, retcode = 0;
 329
 330         /* Save the incoming data, and set the response before continuing
 331          * any further.
 332          */
 333         ver = *sv;
 334         sv->drm_di_major = DRM_IF_MAJOR;
 335         sv->drm_di_minor = DRM_IF_MINOR;
 336         sv->drm_dd_major = dev->driver->major;
 337         sv->drm_dd_minor = dev->driver->minor;
 338
 339         if (ver.drm_di_major != -1) {
 340                 if (ver.drm_di_major != DRM_IF_MAJOR ||
 341                     ver.drm_di_minor < 0 || ver.drm_di_minor > DRM_IF_MINOR) {
 342                         return -EINVAL;
 343                 }
 344                 if_version = DRM_IF_VERSION(ver.drm_di_major,
 345                     ver.drm_dd_minor);
 346                 dev->if_version = DRM_MAX(if_version, dev->if_version);
 347                 if (ver.drm_di_minor >= 1) {
 348                         /*
 349                          * Version 1.1 includes tying of DRM to specific device
 350                          * Version 1.4 has proper PCI domain support
 351                          */
 352                         retcode = drm_set_busid(dev, file_priv);
 353                         if (retcode)
 354                                 return retcode;
 355                 }
 356         }
 357
 358         if (ver.drm_dd_major != -1) {
 359                 if (ver.drm_dd_major != dev->driver->major ||
 360                     ver.drm_dd_minor < 0 ||
 361                     ver.drm_dd_minor > dev->driver->minor)
 362                 {
 363                         return -EINVAL;
 364                 }
 365         }
 366
 367         return 0;
 368 }
 369
 370 /**
 371  * drm_noop - DRM no-op ioctl implemntation
 372  * @dev: DRM device for the ioctl
 373  * @data: data pointer for the ioctl
 374  * @file_priv: DRM file for the ioctl call
 375  *
 376  * This no-op implementation for drm ioctls is useful for deprecated
 377  * functionality where we can't return a failure code because existing userspace
 378  * checks the result of the ioctl, but doesn't care about the action.
 379  *
 380  * Always returns successfully with 0.
 381  */
 382 int drm_noop(struct drm_device *dev, void *data,
 383              struct drm_file *file_priv)
 384 {
 385         DRM_DEBUG("\n");
 386         return 0;
 387 }
 388 EXPORT_SYMBOL(drm_noop);
 389
 390 /**
 391  * drm_invalid_op - DRM invalid ioctl implemntation
 392  * @dev: DRM device for the ioctl
 393  * @data: data pointer for the ioctl
 394  * @file_priv: DRM file for the ioctl call
 395  *
 396  * This no-op implementation for drm ioctls is useful for deprecated
 397  * functionality where we really don't want to allow userspace to call the ioctl
 398  * any more. This is the case for old ums interfaces for drivers that
 399  * transitioned to kms gradually and so kept the old legacy tables around. This
 400  * only applies to radeon and i915 kms drivers, other drivers shouldn't need to
 401  * use this function.
 402  *
 403  * Always fails with a return value of -EINVAL.
 404  */
 405 int drm_invalid_op(struct drm_device *dev, void *data,
 406                    struct drm_file *file_priv)
 407 {
 408         return -EINVAL;
 409 }
 410 EXPORT_SYMBOL(drm_invalid_op);
 411
 412 /*
 413  * Copy and IOCTL return string to user space
 414  */
 415 static int drm_copy_field(char __user *buf, size_t *buf_len, const char *value)
 416 {
 417         int len;
 418
 419         /* don't overflow userbuf */
 420         len = strlen(value);
 421         if (len > *buf_len)
 422                 len = *buf_len;
 423
 424         /* let userspace know exact length of driver value (which could be
 425          * larger than the userspace-supplied buffer) */
 426         *buf_len = strlen(value);
 427
 428         /* finally, try filling in the userbuf */
 429         if (len && buf)
 430                 if (copy_to_user(buf, value, len))
 431                         return -EFAULT;
 432         return 0;
 433 }
 434
 435 /*
 436  * Get version information
 437  *
 438  * \param inode device inode.
 439  * \param filp file pointer.
 440  * \param cmd command.
 441  * \param arg user argument, pointing to a drm_version structure.
 442  * \return zero on success or negative number on failure.
 443  *
 444  * Fills in the version information in \p arg.
 445  */
 446 static int drm_version(struct drm_device *dev, void *data,
 447                        struct drm_file *file_priv)
 448 {
 449         struct drm_version *version = data;
 450         int err;
 451
 452         version->version_major = dev->driver->major;
 453         version->version_minor = dev->driver->minor;
 454         version->version_patchlevel = dev->driver->patchlevel;
 455         err = drm_copy_field(version->name, &version->name_len,
 456                         dev->driver->name);
 457         if (!err)
 458                 err = drm_copy_field(version->date, &version->date_len,
 459                                 dev->driver->date);
 460         if (!err)
 461                 err = drm_copy_field(version->desc, &version->desc_len,
 462                                 dev->driver->desc);
 463
 464         return err;
 465 }
 466
 467 /*
 468  * drm_ioctl_permit - Check ioctl permissions against caller
 469  *
 470  * @flags: ioctl permission flags.
 471  * @file_priv: Pointer to struct drm_file identifying the caller.
 472  *
 473  * Checks whether the caller is allowed to run an ioctl with the
 474  * indicated permissions. If so, returns zero. Otherwise returns an
 475  * error code suitable for ioctl return.
 476  */
 477 #if 0
 478 int drm_ioctl_permit(u32 flags, struct drm_file *file_priv)
 479 {
 480         /* ROOT_ONLY is only for CAP_SYS_ADMIN */
 481         if (unlikely((flags & DRM_ROOT_ONLY) && !capable(CAP_SYS_ADMIN)))
 482                 return -EACCES;
 483
 484         /* AUTH is only for authenticated or render client */
 485         if (unlikely((flags & DRM_AUTH) && !drm_is_render_client(file_priv) &&
 486                      !file_priv->authenticated))
 487                 return -EACCES;
 488
 489         /* MASTER is only for master or control clients */
 490         if (unlikely((flags & DRM_MASTER) && !file_priv->is_master &&
 491                      !drm_is_control_client(file_priv)))
 492                 return -EACCES;
 493
 494         /* Control clients must be explicitly allowed */
 495         if (unlikely(!(flags & DRM_CONTROL_ALLOW) &&
 496                      drm_is_control_client(file_priv)))
 497                 return -EACCES;
 498
 499         /* Render clients must be explicitly allowed */
 500         if (unlikely(!(flags & DRM_RENDER_ALLOW) &&
 501                      drm_is_render_client(file_priv)))
 502                 return -EACCES;
 503
 504         return 0;
 505 }
 506 EXPORT_SYMBOL(drm_ioctl_permit);
 507 #endif
 508
 509 #define DRM_IOCTL_DEF(ioctl, _func, _flags)     \
 510         [DRM_IOCTL_NR(ioctl)] = {               \
 511                 .cmd = ioctl,                   \
 512                 .func = _func,                  \
 513                 .flags = _flags,                \
 514                 .cmd_drv = 0,                   \
 515                 .name = #ioctl                  \
 516         }
 517
 518 /* Ioctl table */
 519 static const struct drm_ioctl_desc drm_ioctls[] = {
 520         DRM_IOCTL_DEF(DRM_IOCTL_VERSION, drm_version,
 521                       DRM_UNLOCKED|DRM_RENDER_ALLOW|DRM_CONTROL_ALLOW),
 522         DRM_IOCTL_DEF(DRM_IOCTL_GET_UNIQUE, drm_getunique, 0),
 523         DRM_IOCTL_DEF(DRM_IOCTL_GET_MAGIC, drm_getmagic, 0),
 524         DRM_IOCTL_DEF(DRM_IOCTL_IRQ_BUSID, drm_irq_by_busid, DRM_MASTER|DRM_ROOT_ONLY),
 525         DRM_IOCTL_DEF(DRM_IOCTL_GET_MAP, drm_legacy_getmap_ioctl, DRM_UNLOCKED),
 526         DRM_IOCTL_DEF(DRM_IOCTL_GET_CLIENT, drm_getclient, DRM_UNLOCKED),
 527         DRM_IOCTL_DEF(DRM_IOCTL_GET_STATS, drm_getstats, DRM_UNLOCKED),
 528         DRM_IOCTL_DEF(DRM_IOCTL_GET_CAP, drm_getcap, DRM_UNLOCKED|DRM_RENDER_ALLOW),
 529         DRM_IOCTL_DEF(DRM_IOCTL_SET_CLIENT_CAP, drm_setclientcap, 0),
 530         DRM_IOCTL_DEF(DRM_IOCTL_SET_VERSION, drm_setversion, DRM_MASTER),
 531
 532         DRM_IOCTL_DEF(DRM_IOCTL_SET_UNIQUE, drm_setunique, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
 533         DRM_IOCTL_DEF(DRM_IOCTL_BLOCK, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
 534         DRM_IOCTL_DEF(DRM_IOCTL_UNBLOCK, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
 535         DRM_IOCTL_DEF(DRM_IOCTL_AUTH_MAGIC, drm_authmagic, DRM_AUTH|DRM_MASTER),
 536
 537         DRM_IOCTL_DEF(DRM_IOCTL_ADD_MAP, drm_legacy_addmap_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
 538         DRM_IOCTL_DEF(DRM_IOCTL_RM_MAP, drm_legacy_rmmap_ioctl, DRM_AUTH),
 539
 540         DRM_IOCTL_DEF(DRM_IOCTL_SET_SAREA_CTX, drm_legacy_setsareactx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
 541         DRM_IOCTL_DEF(DRM_IOCTL_GET_SAREA_CTX, drm_legacy_getsareactx, DRM_AUTH),
 542
 543         DRM_IOCTL_DEF(DRM_IOCTL_SET_MASTER, drm_setmaster_ioctl, DRM_ROOT_ONLY),
 544         DRM_IOCTL_DEF(DRM_IOCTL_DROP_MASTER, drm_dropmaster_ioctl, DRM_ROOT_ONLY),
 545
 546         DRM_IOCTL_DEF(DRM_IOCTL_ADD_CTX, drm_legacy_addctx, DRM_AUTH|DRM_ROOT_ONLY),
 547         DRM_IOCTL_DEF(DRM_IOCTL_RM_CTX, drm_legacy_rmctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
 548         DRM_IOCTL_DEF(DRM_IOCTL_MOD_CTX, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
 549         DRM_IOCTL_DEF(DRM_IOCTL_GET_CTX, drm_legacy_getctx, DRM_AUTH),
 550         DRM_IOCTL_DEF(DRM_IOCTL_SWITCH_CTX, drm_legacy_switchctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
 551         DRM_IOCTL_DEF(DRM_IOCTL_NEW_CTX, drm_legacy_newctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
 552         DRM_IOCTL_DEF(DRM_IOCTL_RES_CTX, drm_legacy_resctx, DRM_AUTH),
 553
 554         DRM_IOCTL_DEF(DRM_IOCTL_ADD_DRAW, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
 555         DRM_IOCTL_DEF(DRM_IOCTL_RM_DRAW, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
 556
 557         DRM_IOCTL_DEF(DRM_IOCTL_LOCK, drm_legacy_lock, DRM_AUTH),
 558         DRM_IOCTL_DEF(DRM_IOCTL_UNLOCK, drm_legacy_unlock, DRM_AUTH),
 559
 560         DRM_IOCTL_DEF(DRM_IOCTL_FINISH, drm_noop, DRM_AUTH),
 561
 562         DRM_IOCTL_DEF(DRM_IOCTL_ADD_BUFS, drm_legacy_addbufs, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
 563         DRM_IOCTL_DEF(DRM_IOCTL_MARK_BUFS, drm_legacy_markbufs, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
 564         DRM_IOCTL_DEF(DRM_IOCTL_INFO_BUFS, drm_legacy_infobufs, DRM_AUTH),
 565         DRM_IOCTL_DEF(DRM_IOCTL_MAP_BUFS, drm_legacy_mapbufs, DRM_AUTH),
 566         DRM_IOCTL_DEF(DRM_IOCTL_FREE_BUFS, drm_legacy_freebufs, DRM_AUTH),
 567         DRM_IOCTL_DEF(DRM_IOCTL_DMA, drm_legacy_dma_ioctl, DRM_AUTH),
 568
 569         DRM_IOCTL_DEF(DRM_IOCTL_CONTROL, drm_control, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
 570
 571 #if IS_ENABLED(CONFIG_AGP)
 572         DRM_IOCTL_DEF(DRM_IOCTL_AGP_ACQUIRE, drm_agp_acquire_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
 573         DRM_IOCTL_DEF(DRM_IOCTL_AGP_RELEASE, drm_agp_release_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
 574         DRM_IOCTL_DEF(DRM_IOCTL_AGP_ENABLE, drm_agp_enable_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
 575         DRM_IOCTL_DEF(DRM_IOCTL_AGP_INFO, drm_agp_info_ioctl, DRM_AUTH),
 576         DRM_IOCTL_DEF(DRM_IOCTL_AGP_ALLOC, drm_agp_alloc_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
 577         DRM_IOCTL_DEF(DRM_IOCTL_AGP_FREE, drm_agp_free_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
 578         DRM_IOCTL_DEF(DRM_IOCTL_AGP_BIND, drm_agp_bind_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
 579         DRM_IOCTL_DEF(DRM_IOCTL_AGP_UNBIND, drm_agp_unbind_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
 580 #endif
 581
 582         DRM_IOCTL_DEF(DRM_IOCTL_SG_ALLOC, drm_legacy_sg_alloc, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
 583         DRM_IOCTL_DEF(DRM_IOCTL_SG_FREE, drm_legacy_sg_free, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
 584
 585         DRM_IOCTL_DEF(DRM_IOCTL_WAIT_VBLANK, drm_wait_vblank, DRM_UNLOCKED),
 586
 587         DRM_IOCTL_DEF(DRM_IOCTL_MODESET_CTL, drm_modeset_ctl, 0),
 588
 589         DRM_IOCTL_DEF(DRM_IOCTL_UPDATE_DRAW, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
 590
 591         DRM_IOCTL_DEF(DRM_IOCTL_GEM_CLOSE, drm_gem_close_ioctl, DRM_UNLOCKED|DRM_RENDER_ALLOW),
 592         DRM_IOCTL_DEF(DRM_IOCTL_GEM_FLINK, drm_gem_flink_ioctl, DRM_AUTH|DRM_UNLOCKED),
 593         DRM_IOCTL_DEF(DRM_IOCTL_GEM_OPEN, drm_gem_open_ioctl, DRM_AUTH|DRM_UNLOCKED),
 594
 595         DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETRESOURCES, drm_mode_getresources, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 596
 597 #if 0
 598         DRM_IOCTL_DEF(DRM_IOCTL_PRIME_HANDLE_TO_FD, drm_prime_handle_to_fd_ioctl, DRM_AUTH|DRM_UNLOCKED|DRM_RENDER_ALLOW),
 599         DRM_IOCTL_DEF(DRM_IOCTL_PRIME_FD_TO_HANDLE, drm_prime_fd_to_handle_ioctl, DRM_AUTH|DRM_UNLOCKED|DRM_RENDER_ALLOW),
 600 #endif
 601
 602         DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPLANERESOURCES, drm_mode_getplane_res, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 603         DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETCRTC, drm_mode_getcrtc, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 604         DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETCRTC, drm_mode_setcrtc, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 605         DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPLANE, drm_mode_getplane, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 606         DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETPLANE, drm_mode_setplane, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 607         DRM_IOCTL_DEF(DRM_IOCTL_MODE_CURSOR, drm_mode_cursor_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 608         DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETGAMMA, drm_mode_gamma_get_ioctl, DRM_UNLOCKED),
 609         DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETGAMMA, drm_mode_gamma_set_ioctl, DRM_MASTER|DRM_UNLOCKED),
 610         DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETENCODER, drm_mode_getencoder, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 611         DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETCONNECTOR, drm_mode_getconnector, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 612         DRM_IOCTL_DEF(DRM_IOCTL_MODE_ATTACHMODE, drm_noop, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 613         DRM_IOCTL_DEF(DRM_IOCTL_MODE_DETACHMODE, drm_noop, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 614         DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPROPERTY, drm_mode_getproperty_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 615         DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETPROPERTY, drm_mode_connector_property_set_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 616         DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPROPBLOB, drm_mode_getblob_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 617         DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETFB, drm_mode_getfb, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 618         DRM_IOCTL_DEF(DRM_IOCTL_MODE_ADDFB, drm_mode_addfb, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 619         DRM_IOCTL_DEF(DRM_IOCTL_MODE_ADDFB2, drm_mode_addfb2, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 620         DRM_IOCTL_DEF(DRM_IOCTL_MODE_RMFB, drm_mode_rmfb, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 621         DRM_IOCTL_DEF(DRM_IOCTL_MODE_PAGE_FLIP, drm_mode_page_flip_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 622         DRM_IOCTL_DEF(DRM_IOCTL_MODE_DIRTYFB, drm_mode_dirtyfb_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 623         DRM_IOCTL_DEF(DRM_IOCTL_MODE_CREATE_DUMB, drm_mode_create_dumb_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 624         DRM_IOCTL_DEF(DRM_IOCTL_MODE_MAP_DUMB, drm_mode_mmap_dumb_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 625         DRM_IOCTL_DEF(DRM_IOCTL_MODE_DESTROY_DUMB, drm_mode_destroy_dumb_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 626         DRM_IOCTL_DEF(DRM_IOCTL_MODE_OBJ_GETPROPERTIES, drm_mode_obj_get_properties_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 627         DRM_IOCTL_DEF(DRM_IOCTL_MODE_OBJ_SETPROPERTY, drm_mode_obj_set_property_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 628         DRM_IOCTL_DEF(DRM_IOCTL_MODE_CURSOR2, drm_mode_cursor2_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 629         DRM_IOCTL_DEF(DRM_IOCTL_MODE_ATOMIC, drm_mode_atomic_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 630         DRM_IOCTL_DEF(DRM_IOCTL_MODE_CREATEPROPBLOB, drm_mode_createblob_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 631         DRM_IOCTL_DEF(DRM_IOCTL_MODE_DESTROYPROPBLOB, drm_mode_destroyblob_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
 632 };
 633
 634 #define DRM_CORE_IOCTL_COUNT    ARRAY_SIZE( drm_ioctls )
 635
 636 /**
 637  * drm_ioctl - ioctl callback implementation for DRM drivers
 638  * @filp: file this ioctl is called on
 639  * @cmd: ioctl cmd number
 640  * @arg: user argument
 641  *
 642  * Looks up the ioctl function in the ::ioctls table, checking for root
 643  * previleges if so required, and dispatches to the respective function.
 644  *
 645  * Returns:
 646  * Zero on success, negative error code on failure.
 647  */
 648 int drm_ioctl(struct dev_ioctl_args *ap)
 649 {
 650         struct cdev *kdev = ap->a_head.a_dev;
 651         struct drm_device *dev;
 652         const struct drm_ioctl_desc *ioctl = NULL;
 653         u_long cmd = ap->a_cmd;
 654         unsigned int nr = DRM_IOCTL_NR(cmd);
 655         int retcode = 0;
 656         caddr_t data = ap->a_data;
 657         int (*func)(struct drm_device *dev, void *data, struct drm_file *file_priv);
 658         struct drm_file *file_priv;
 659         bool is_driver_ioctl;
 660
 661         dev = drm_get_device_from_kdev(kdev);
 662
 663         retcode = devfs_get_cdevpriv(ap->a_fp, (void **)&file_priv);
 664         if (retcode !=0) {
 665                 DRM_ERROR("can't find authenticator\n");
 666                 return EINVAL;
 667         }
 668
 669         atomic_inc(&dev->counts[_DRM_STAT_IOCTLS]);
 670
 671         if (drm_device_is_unplugged(dev))
 672                 return ENODEV;
 673
 674         is_driver_ioctl = nr >= DRM_COMMAND_BASE && nr < DRM_COMMAND_END;
 675
 676         if (IOCGROUP(cmd) != DRM_IOCTL_BASE) {
 677                 DRM_DEBUG_FIOCTL("Bad ioctl group 0x%x\n", (int)IOCGROUP(cmd));
 678                 return EINVAL;
 679         }
 680
 681         ioctl = &drm_ioctls[nr];
 682         /* It's not a core DRM ioctl, try driver-specific. */
 683         if (ioctl->func == NULL && nr >= DRM_COMMAND_BASE) {
 684                 /* The array entries begin at DRM_COMMAND_BASE ioctl nr */
 685                 nr -= DRM_COMMAND_BASE;
 686                 if (nr >= dev->driver->num_ioctls) {
 687                         return EINVAL;
 688                 }
 689                 ioctl = &dev->driver->ioctls[nr];
 690                 is_driver_ioctl = 1;
 691         }
 692
 693         DRM_DEBUG_IOCTL("pid=%d, dev=0x%lx, auth=%d, %s\n",
 694                   DRM_CURRENTPID, (long)dev->dev,
 695                   file_priv->authenticated, ioctl->name);
 696
 697         /* Do not trust userspace, use our own definition */
 698         func = ioctl->func;
 699
 700         if (unlikely(!func)) {
 701                 DRM_DEBUG("no function\n");
 702                 retcode = -EINVAL;
 703                 goto err_i1;
 704         }
 705
 706         if (((ioctl->flags & DRM_ROOT_ONLY) && !capable(CAP_SYS_ADMIN)) ||
 707             ((ioctl->flags & DRM_AUTH) && !file_priv->authenticated) ||
 708             ((ioctl->flags & DRM_MASTER) && !file_priv->master))
 709                 return EACCES;
 710
 711         /* Enforce sane locking for kms driver ioctls. Core ioctls are
 712          * too messy still. */
 713         if (is_driver_ioctl) {
 714                 if ((ioctl->flags & DRM_UNLOCKED) == 0)
 715                         mutex_lock(&drm_global_mutex);
 716                 /* shared code returns -errno */
 717                 retcode = -func(dev, data, file_priv);
 718                 if (retcode == ERESTARTSYS)
 719                         retcode = EINTR;
 720                 if ((ioctl->flags & DRM_UNLOCKED) == 0)
 721                         mutex_unlock(&drm_global_mutex);
 722         } else {
 723                 retcode = -func(dev, data, file_priv);
 724                 if (retcode == ERESTARTSYS)
 725                         retcode = EINTR;
 726         }
 727
 728       err_i1:
 729         if (!ioctl)
 730                 DRM_DEBUG_FIOCTL("invalid ioctl: pid=%d, dev=0x%lx, auth=%d, cmd=0x%02lx, nr=0x%02x\n",
 731                           DRM_CURRENTPID,
 732                           (long)dev->dev,
 733                           file_priv->authenticated, cmd, nr);
 734
 735         if (retcode)
 736                 DRM_DEBUG_FIOCTL("ret = %d\n", retcode);
 737         return retcode;
 738 }
 739 EXPORT_SYMBOL(drm_ioctl);
 740
 741 /**
 742  * drm_ioctl_flags - Check for core ioctl and return ioctl permission flags
 743  * @nr: ioctl number
 744  * @flags: where to return the ioctl permission flags
 745  *
 746  * This ioctl is only used by the vmwgfx driver to augment the access checks
 747  * done by the drm core and insofar a pretty decent layering violation. This
 748  * shouldn't be used by any drivers.
 749  *
 750  * Returns:
 751  * True if the @nr corresponds to a DRM core ioctl numer, false otherwise.
 752  */
 753 bool drm_ioctl_flags(unsigned int nr, unsigned int *flags)
 754 {
 755         if ((nr >= DRM_COMMAND_END && nr < DRM_CORE_IOCTL_COUNT) ||
 756             (nr < DRM_COMMAND_BASE)) {
 757                 *flags = drm_ioctls[nr].flags;
 758                 return true;
 759         }
 760
 761         return false;
 762 }
 763 EXPORT_SYMBOL(drm_ioctl_flags);