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); 766