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); 736