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); 764