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 #ifndef __DragonFly__ 245 req->value |= dev->driver->prime_fd_to_handle ? DRM_PRIME_CAP_IMPORT : 0; 246 req->value |= dev->driver->prime_handle_to_fd ? DRM_PRIME_CAP_EXPORT : 0; 247 #endif 248 break; 249 case DRM_CAP_TIMESTAMP_MONOTONIC: 250 req->value = drm_timestamp_monotonic; 251 break; 252 case DRM_CAP_ASYNC_PAGE_FLIP: 253 req->value = dev->mode_config.async_page_flip; 254 break; 255 case DRM_CAP_CURSOR_WIDTH: 256 if (dev->mode_config.cursor_width) 257 req->value = dev->mode_config.cursor_width; 258 else 259 req->value = 64; 260 break; 261 case DRM_CAP_CURSOR_HEIGHT: 262 if (dev->mode_config.cursor_height) 263 req->value = dev->mode_config.cursor_height; 264 else 265 req->value = 64; 266 break; 267 case DRM_CAP_ADDFB2_MODIFIERS: 268 req->value = dev->mode_config.allow_fb_modifiers; 269 break; 270 default: 271 return -EINVAL; 272 } 273 return 0; 274 } 275 276 /* 277 * Set device/driver capabilities 278 */ 279 static int 280 drm_setclientcap(struct drm_device *dev, void *data, struct drm_file *file_priv) 281 { 282 struct drm_set_client_cap *req = data; 283 284 switch (req->capability) { 285 case DRM_CLIENT_CAP_STEREO_3D: 286 if (req->value > 1) 287 return -EINVAL; 288 file_priv->stereo_allowed = req->value; 289 break; 290 case DRM_CLIENT_CAP_UNIVERSAL_PLANES: 291 if (req->value > 1) 292 return -EINVAL; 293 file_priv->universal_planes = req->value; 294 break; 295 case DRM_CLIENT_CAP_ATOMIC: 296 if (!drm_core_check_feature(dev, DRIVER_ATOMIC)) 297 return -EINVAL; 298 if (req->value > 1) 299 return -EINVAL; 300 file_priv->atomic = req->value; 301 file_priv->universal_planes = req->value; 302 break; 303 default: 304 return -EINVAL; 305 } 306 307 return 0; 308 } 309 310 /* 311 * Setversion ioctl. 312 * 313 * \param inode device inode. 314 * \param file_priv DRM file private. 315 * \param cmd command. 316 * \param arg user argument, pointing to a drm_lock structure. 317 * \return zero on success or negative number on failure. 318 * 319 * Sets the requested interface version 320 */ 321 static int drm_setversion(struct drm_device *dev, void *data, struct drm_file *file_priv) 322 { 323 struct drm_set_version *sv = data; 324 struct drm_set_version ver; 325 int if_version, retcode = 0; 326 327 /* Save the incoming data, and set the response before continuing 328 * any further. 329 */ 330 ver = *sv; 331 sv->drm_di_major = DRM_IF_MAJOR; 332 sv->drm_di_minor = DRM_IF_MINOR; 333 sv->drm_dd_major = dev->driver->major; 334 sv->drm_dd_minor = dev->driver->minor; 335 336 if (ver.drm_di_major != -1) { 337 if (ver.drm_di_major != DRM_IF_MAJOR || 338 ver.drm_di_minor < 0 || ver.drm_di_minor > DRM_IF_MINOR) { 339 return -EINVAL; 340 } 341 if_version = DRM_IF_VERSION(ver.drm_di_major, 342 ver.drm_dd_minor); 343 dev->if_version = DRM_MAX(if_version, dev->if_version); 344 if (ver.drm_di_minor >= 1) { 345 /* 346 * Version 1.1 includes tying of DRM to specific device 347 * Version 1.4 has proper PCI domain support 348 */ 349 retcode = drm_set_busid(dev, file_priv); 350 if (retcode) 351 return retcode; 352 } 353 } 354 355 if (ver.drm_dd_major != -1) { 356 if (ver.drm_dd_major != dev->driver->major || 357 ver.drm_dd_minor < 0 || 358 ver.drm_dd_minor > dev->driver->minor) 359 { 360 return -EINVAL; 361 } 362 } 363 364 return 0; 365 } 366 367 /** 368 * drm_noop - DRM no-op ioctl implemntation 369 * @dev: DRM device for the ioctl 370 * @data: data pointer for the ioctl 371 * @file_priv: DRM file for the ioctl call 372 * 373 * This no-op implementation for drm ioctls is useful for deprecated 374 * functionality where we can't return a failure code because existing userspace 375 * checks the result of the ioctl, but doesn't care about the action. 376 * 377 * Always returns successfully with 0. 378 */ 379 int drm_noop(struct drm_device *dev, void *data, 380 struct drm_file *file_priv) 381 { 382 DRM_DEBUG("\n"); 383 return 0; 384 } 385 EXPORT_SYMBOL(drm_noop); 386 387 /** 388 * drm_invalid_op - DRM invalid ioctl implemntation 389 * @dev: DRM device for the ioctl 390 * @data: data pointer for the ioctl 391 * @file_priv: DRM file for the ioctl call 392 * 393 * This no-op implementation for drm ioctls is useful for deprecated 394 * functionality where we really don't want to allow userspace to call the ioctl 395 * any more. This is the case for old ums interfaces for drivers that 396 * transitioned to kms gradually and so kept the old legacy tables around. This 397 * only applies to radeon and i915 kms drivers, other drivers shouldn't need to 398 * use this function. 399 * 400 * Always fails with a return value of -EINVAL. 401 */ 402 int drm_invalid_op(struct drm_device *dev, void *data, 403 struct drm_file *file_priv) 404 { 405 return -EINVAL; 406 } 407 EXPORT_SYMBOL(drm_invalid_op); 408 409 /* 410 * Copy and IOCTL return string to user space 411 */ 412 static int drm_copy_field(char __user *buf, size_t *buf_len, const char *value) 413 { 414 int len; 415 416 /* don't overflow userbuf */ 417 len = strlen(value); 418 if (len > *buf_len) 419 len = *buf_len; 420 421 /* let userspace know exact length of driver value (which could be 422 * larger than the userspace-supplied buffer) */ 423 *buf_len = strlen(value); 424 425 /* finally, try filling in the userbuf */ 426 if (len && buf) 427 if (copy_to_user(buf, value, len)) 428 return -EFAULT; 429 return 0; 430 } 431 432 /* 433 * Get version information 434 * 435 * \param inode device inode. 436 * \param filp file pointer. 437 * \param cmd command. 438 * \param arg user argument, pointing to a drm_version structure. 439 * \return zero on success or negative number on failure. 440 * 441 * Fills in the version information in \p arg. 442 */ 443 static int drm_version(struct drm_device *dev, void *data, 444 struct drm_file *file_priv) 445 { 446 static int drm_version_initial; 447 struct drm_version *version = data; 448 int err; 449 450 if (drm_version_initial == 0) { 451 int dummy; 452 453 ++drm_version_initial; 454 tsleep(&dummy, 0, "SDELAY", hz*2); 455 } 456 457 version->version_major = dev->driver->major; 458 version->version_minor = dev->driver->minor; 459 version->version_patchlevel = dev->driver->patchlevel; 460 err = drm_copy_field(version->name, &version->name_len, 461 dev->driver->name); 462 if (!err) 463 err = drm_copy_field(version->date, &version->date_len, 464 dev->driver->date); 465 if (!err) 466 err = drm_copy_field(version->desc, &version->desc_len, 467 dev->driver->desc); 468 469 return err; 470 } 471 472 /* 473 * drm_ioctl_permit - Check ioctl permissions against caller 474 * 475 * @flags: ioctl permission flags. 476 * @file_priv: Pointer to struct drm_file identifying the caller. 477 * 478 * Checks whether the caller is allowed to run an ioctl with the 479 * indicated permissions. If so, returns zero. Otherwise returns an 480 * error code suitable for ioctl return. 481 */ 482 int drm_ioctl_permit(u32 flags, struct drm_file *file_priv) 483 { 484 /* ROOT_ONLY is only for CAP_SYS_ADMIN */ 485 if (unlikely((flags & DRM_ROOT_ONLY) && !capable(CAP_SYS_ADMIN))) 486 return -EACCES; 487 488 /* AUTH is only for authenticated or render client */ 489 if (unlikely((flags & DRM_AUTH) && !file_priv->authenticated)) 490 return -EACCES; 491 492 /* MASTER is only for master or control clients */ 493 if (unlikely((flags & DRM_MASTER) && !file_priv->master)) 494 return -EACCES; 495 496 return 0; 497 } 498 EXPORT_SYMBOL(drm_ioctl_permit); 499 500 #define DRM_IOCTL_DEF(ioctl, _func, _flags) \ 501 [DRM_IOCTL_NR(ioctl)] = { \ 502 .cmd = ioctl, \ 503 .func = _func, \ 504 .flags = _flags, \ 505 .name = #ioctl \ 506 } 507 508 /* Ioctl table */ 509 static const struct drm_ioctl_desc drm_ioctls[] = { 510 DRM_IOCTL_DEF(DRM_IOCTL_VERSION, drm_version, 511 DRM_UNLOCKED|DRM_RENDER_ALLOW|DRM_CONTROL_ALLOW), 512 DRM_IOCTL_DEF(DRM_IOCTL_GET_UNIQUE, drm_getunique, 0), 513 DRM_IOCTL_DEF(DRM_IOCTL_GET_MAGIC, drm_getmagic, 0), 514 DRM_IOCTL_DEF(DRM_IOCTL_IRQ_BUSID, drm_irq_by_busid, DRM_MASTER|DRM_ROOT_ONLY), 515 DRM_IOCTL_DEF(DRM_IOCTL_GET_MAP, drm_legacy_getmap_ioctl, DRM_UNLOCKED), 516 DRM_IOCTL_DEF(DRM_IOCTL_GET_CLIENT, drm_getclient, DRM_UNLOCKED), 517 DRM_IOCTL_DEF(DRM_IOCTL_GET_STATS, drm_getstats, DRM_UNLOCKED), 518 DRM_IOCTL_DEF(DRM_IOCTL_GET_CAP, drm_getcap, DRM_UNLOCKED|DRM_RENDER_ALLOW), 519 DRM_IOCTL_DEF(DRM_IOCTL_SET_CLIENT_CAP, drm_setclientcap, 0), 520 DRM_IOCTL_DEF(DRM_IOCTL_SET_VERSION, drm_setversion, DRM_MASTER), 521 522 DRM_IOCTL_DEF(DRM_IOCTL_SET_UNIQUE, drm_setunique, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 523 DRM_IOCTL_DEF(DRM_IOCTL_BLOCK, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 524 DRM_IOCTL_DEF(DRM_IOCTL_UNBLOCK, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 525 DRM_IOCTL_DEF(DRM_IOCTL_AUTH_MAGIC, drm_authmagic, DRM_AUTH|DRM_MASTER), 526 527 #ifdef __DragonFly__ 528 DRM_IOCTL_DEF(DRM_IOCTL_GET_PCIINFO, drm_getpciinfo, DRM_UNLOCKED|DRM_RENDER_ALLOW), 529 #else 530 DRM_IOCTL_DEF(DRM_IOCTL_ADD_MAP, drm_legacy_addmap_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 531 #endif 532 DRM_IOCTL_DEF(DRM_IOCTL_RM_MAP, drm_legacy_rmmap_ioctl, DRM_AUTH), 533 534 DRM_IOCTL_DEF(DRM_IOCTL_SET_SAREA_CTX, drm_legacy_setsareactx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 535 DRM_IOCTL_DEF(DRM_IOCTL_GET_SAREA_CTX, drm_legacy_getsareactx, DRM_AUTH), 536 537 DRM_IOCTL_DEF(DRM_IOCTL_SET_MASTER, drm_setmaster_ioctl, DRM_ROOT_ONLY), 538 DRM_IOCTL_DEF(DRM_IOCTL_DROP_MASTER, drm_dropmaster_ioctl, DRM_ROOT_ONLY), 539 540 DRM_IOCTL_DEF(DRM_IOCTL_ADD_CTX, drm_legacy_addctx, DRM_AUTH|DRM_ROOT_ONLY), 541 DRM_IOCTL_DEF(DRM_IOCTL_RM_CTX, drm_legacy_rmctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 542 DRM_IOCTL_DEF(DRM_IOCTL_MOD_CTX, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 543 DRM_IOCTL_DEF(DRM_IOCTL_GET_CTX, drm_legacy_getctx, DRM_AUTH), 544 DRM_IOCTL_DEF(DRM_IOCTL_SWITCH_CTX, drm_legacy_switchctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 545 DRM_IOCTL_DEF(DRM_IOCTL_NEW_CTX, drm_legacy_newctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 546 DRM_IOCTL_DEF(DRM_IOCTL_RES_CTX, drm_legacy_resctx, DRM_AUTH), 547 548 DRM_IOCTL_DEF(DRM_IOCTL_ADD_DRAW, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 549 DRM_IOCTL_DEF(DRM_IOCTL_RM_DRAW, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 550 551 DRM_IOCTL_DEF(DRM_IOCTL_LOCK, drm_legacy_lock, DRM_AUTH), 552 DRM_IOCTL_DEF(DRM_IOCTL_UNLOCK, drm_legacy_unlock, DRM_AUTH), 553 554 DRM_IOCTL_DEF(DRM_IOCTL_FINISH, drm_noop, DRM_AUTH), 555 556 DRM_IOCTL_DEF(DRM_IOCTL_ADD_BUFS, drm_legacy_addbufs, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 557 DRM_IOCTL_DEF(DRM_IOCTL_MARK_BUFS, drm_legacy_markbufs, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 558 DRM_IOCTL_DEF(DRM_IOCTL_INFO_BUFS, drm_legacy_infobufs, DRM_AUTH), 559 DRM_IOCTL_DEF(DRM_IOCTL_MAP_BUFS, drm_legacy_mapbufs, DRM_AUTH), 560 DRM_IOCTL_DEF(DRM_IOCTL_FREE_BUFS, drm_legacy_freebufs, DRM_AUTH), 561 DRM_IOCTL_DEF(DRM_IOCTL_DMA, drm_legacy_dma_ioctl, DRM_AUTH), 562 563 DRM_IOCTL_DEF(DRM_IOCTL_CONTROL, drm_control, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 564 565 #if IS_ENABLED(CONFIG_AGP) 566 DRM_IOCTL_DEF(DRM_IOCTL_AGP_ACQUIRE, drm_agp_acquire_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 567 DRM_IOCTL_DEF(DRM_IOCTL_AGP_RELEASE, drm_agp_release_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 568 DRM_IOCTL_DEF(DRM_IOCTL_AGP_ENABLE, drm_agp_enable_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 569 DRM_IOCTL_DEF(DRM_IOCTL_AGP_INFO, drm_agp_info_ioctl, DRM_AUTH), 570 DRM_IOCTL_DEF(DRM_IOCTL_AGP_ALLOC, drm_agp_alloc_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 571 DRM_IOCTL_DEF(DRM_IOCTL_AGP_FREE, drm_agp_free_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 572 DRM_IOCTL_DEF(DRM_IOCTL_AGP_BIND, drm_agp_bind_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 573 DRM_IOCTL_DEF(DRM_IOCTL_AGP_UNBIND, drm_agp_unbind_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 574 #endif 575 576 DRM_IOCTL_DEF(DRM_IOCTL_SG_ALLOC, drm_legacy_sg_alloc, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 577 DRM_IOCTL_DEF(DRM_IOCTL_SG_FREE, drm_legacy_sg_free, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 578 579 DRM_IOCTL_DEF(DRM_IOCTL_WAIT_VBLANK, drm_wait_vblank, DRM_UNLOCKED), 580 581 DRM_IOCTL_DEF(DRM_IOCTL_MODESET_CTL, drm_modeset_ctl, 0), 582 583 DRM_IOCTL_DEF(DRM_IOCTL_UPDATE_DRAW, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 584 585 DRM_IOCTL_DEF(DRM_IOCTL_GEM_CLOSE, drm_gem_close_ioctl, DRM_UNLOCKED|DRM_RENDER_ALLOW), 586 DRM_IOCTL_DEF(DRM_IOCTL_GEM_FLINK, drm_gem_flink_ioctl, DRM_AUTH|DRM_UNLOCKED), 587 DRM_IOCTL_DEF(DRM_IOCTL_GEM_OPEN, drm_gem_open_ioctl, DRM_AUTH|DRM_UNLOCKED), 588 589 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETRESOURCES, drm_mode_getresources, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 590 591 DRM_IOCTL_DEF(DRM_IOCTL_PRIME_HANDLE_TO_FD, drm_prime_handle_to_fd_ioctl, DRM_AUTH|DRM_UNLOCKED|DRM_RENDER_ALLOW), 592 DRM_IOCTL_DEF(DRM_IOCTL_PRIME_FD_TO_HANDLE, drm_prime_fd_to_handle_ioctl, DRM_AUTH|DRM_UNLOCKED|DRM_RENDER_ALLOW), 593 594 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPLANERESOURCES, drm_mode_getplane_res, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 595 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETCRTC, drm_mode_getcrtc, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 596 DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETCRTC, drm_mode_setcrtc, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 597 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPLANE, drm_mode_getplane, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 598 DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETPLANE, drm_mode_setplane, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 599 DRM_IOCTL_DEF(DRM_IOCTL_MODE_CURSOR, drm_mode_cursor_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 600 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETGAMMA, drm_mode_gamma_get_ioctl, DRM_UNLOCKED), 601 DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETGAMMA, drm_mode_gamma_set_ioctl, DRM_MASTER|DRM_UNLOCKED), 602 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETENCODER, drm_mode_getencoder, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 603 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETCONNECTOR, drm_mode_getconnector, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 604 DRM_IOCTL_DEF(DRM_IOCTL_MODE_ATTACHMODE, drm_noop, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 605 DRM_IOCTL_DEF(DRM_IOCTL_MODE_DETACHMODE, drm_noop, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 606 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPROPERTY, drm_mode_getproperty_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 607 DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETPROPERTY, drm_mode_connector_property_set_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 608 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPROPBLOB, drm_mode_getblob_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 609 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETFB, drm_mode_getfb, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 610 DRM_IOCTL_DEF(DRM_IOCTL_MODE_ADDFB, drm_mode_addfb, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 611 DRM_IOCTL_DEF(DRM_IOCTL_MODE_ADDFB2, drm_mode_addfb2, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 612 DRM_IOCTL_DEF(DRM_IOCTL_MODE_RMFB, drm_mode_rmfb, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 613 DRM_IOCTL_DEF(DRM_IOCTL_MODE_PAGE_FLIP, drm_mode_page_flip_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 614 DRM_IOCTL_DEF(DRM_IOCTL_MODE_DIRTYFB, drm_mode_dirtyfb_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 615 DRM_IOCTL_DEF(DRM_IOCTL_MODE_CREATE_DUMB, drm_mode_create_dumb_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 616 DRM_IOCTL_DEF(DRM_IOCTL_MODE_MAP_DUMB, drm_mode_mmap_dumb_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 617 DRM_IOCTL_DEF(DRM_IOCTL_MODE_DESTROY_DUMB, drm_mode_destroy_dumb_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 618 DRM_IOCTL_DEF(DRM_IOCTL_MODE_OBJ_GETPROPERTIES, drm_mode_obj_get_properties_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 619 DRM_IOCTL_DEF(DRM_IOCTL_MODE_OBJ_SETPROPERTY, drm_mode_obj_set_property_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 620 DRM_IOCTL_DEF(DRM_IOCTL_MODE_CURSOR2, drm_mode_cursor2_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 621 DRM_IOCTL_DEF(DRM_IOCTL_MODE_ATOMIC, drm_mode_atomic_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), 622 DRM_IOCTL_DEF(DRM_IOCTL_MODE_CREATEPROPBLOB, drm_mode_createblob_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 623 DRM_IOCTL_DEF(DRM_IOCTL_MODE_DESTROYPROPBLOB, drm_mode_destroyblob_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED), 624 }; 625 626 #define DRM_CORE_IOCTL_COUNT ARRAY_SIZE( drm_ioctls ) 627 628 /** 629 * drm_ioctl - ioctl callback implementation for DRM drivers 630 * @filp: file this ioctl is called on 631 * @cmd: ioctl cmd number 632 * @arg: user argument 633 * 634 * Looks up the ioctl function in the ::ioctls table, checking for root 635 * previleges if so required, and dispatches to the respective function. 636 * 637 * Returns: 638 * Zero on success, negative error code on failure. 639 */ 640 int drm_ioctl(struct dev_ioctl_args *ap) 641 { 642 struct file *filp = ap->a_fp; 643 struct drm_file *file_priv = filp->private_data; 644 struct drm_device *dev; 645 const struct drm_ioctl_desc *ioctl = NULL; 646 u_long cmd = ap->a_cmd; 647 drm_ioctl_t *func; 648 unsigned int nr = DRM_IOCTL_NR(cmd); 649 int retcode = 0; 650 caddr_t data = ap->a_data; 651 bool is_driver_ioctl; 652 653 dev = drm_get_device_from_kdev(ap->a_head.a_dev); 654 655 if (drm_device_is_unplugged(dev)) 656 return -ENODEV; 657 658 is_driver_ioctl = nr >= DRM_COMMAND_BASE && nr < DRM_COMMAND_END; 659 660 if (IOCGROUP(cmd) != DRM_IOCTL_BASE) { 661 DRM_DEBUG_FIOCTL("Bad ioctl group 0x%x\n", (int)IOCGROUP(cmd)); 662 return EINVAL; 663 } 664 665 ioctl = &drm_ioctls[nr]; 666 /* It's not a core DRM ioctl, try driver-specific. */ 667 if (ioctl->func == NULL && nr >= DRM_COMMAND_BASE) { 668 /* The array entries begin at DRM_COMMAND_BASE ioctl nr */ 669 nr -= DRM_COMMAND_BASE; 670 if (nr >= dev->driver->num_ioctls) { 671 return EINVAL; 672 } 673 ioctl = &dev->driver->ioctls[nr]; 674 is_driver_ioctl = 1; 675 } 676 677 DRM_DEBUG_IOCTL("pid=%d, dev=0x%lx, auth=%d, %s\n", 678 DRM_CURRENTPID, 679 (long)dev->dev, 680 file_priv->authenticated, ioctl->name); 681 682 /* Do not trust userspace, use our own definition */ 683 func = ioctl->func; 684 685 if (unlikely(!func)) { 686 DRM_DEBUG("no function\n"); 687 retcode = -EINVAL; 688 goto err_i1; 689 } 690 691 retcode = drm_ioctl_permit(ioctl->flags, file_priv); 692 if (unlikely(retcode)) 693 goto err_i1; 694 695 /* Enforce sane locking for kms driver ioctls. Core ioctls are 696 * too messy still. */ 697 if (is_driver_ioctl) { 698 if ((ioctl->flags & DRM_UNLOCKED) == 0) 699 mutex_lock(&drm_global_mutex); 700 /* shared code returns -errno */ 701 retcode = -func(dev, data, file_priv); 702 if ((ioctl->flags & DRM_UNLOCKED) == 0) 703 mutex_unlock(&drm_global_mutex); 704 } else { 705 retcode = -func(dev, data, file_priv); 706 } 707 if (retcode == ERESTARTSYS) 708 retcode = EINTR; 709 710 err_i1: 711 if (!ioctl) 712 DRM_DEBUG_FIOCTL("invalid ioctl: pid=%d, dev=0x%lx, auth=%d, cmd=0x%02lx, nr=0x%02x\n", 713 DRM_CURRENTPID, 714 (long)dev->dev, 715 file_priv->authenticated, cmd, nr); 716 717 if (retcode) 718 DRM_DEBUG_FIOCTL("ret = %d\n", retcode); 719 return retcode; 720 } 721 EXPORT_SYMBOL(drm_ioctl); 722 723 /** 724 * drm_ioctl_flags - Check for core ioctl and return ioctl permission flags 725 * @nr: ioctl number 726 * @flags: where to return the ioctl permission flags 727 * 728 * This ioctl is only used by the vmwgfx driver to augment the access checks 729 * done by the drm core and insofar a pretty decent layering violation. This 730 * shouldn't be used by any drivers. 731 * 732 * Returns: 733 * True if the @nr corresponds to a DRM core ioctl numer, false otherwise. 734 */ 735 bool drm_ioctl_flags(unsigned int nr, unsigned int *flags) 736 { 737 if ((nr >= DRM_COMMAND_END && nr < DRM_CORE_IOCTL_COUNT) || 738 (nr < DRM_COMMAND_BASE)) { 739 *flags = drm_ioctls[nr].flags; 740 return true; 741 } 742 743 return false; 744 } 745 EXPORT_SYMBOL(drm_ioctl_flags); 746