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_auth.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 /** 41 * DOC: getunique and setversion story 42 * 43 * BEWARE THE DRAGONS! MIND THE TRAPDOORS! 44 * 45 * In an attempt to warn anyone else who's trying to figure out what's going 46 * on here, I'll try to summarize the story. First things first, let's clear up 47 * the names, because the kernel internals, libdrm and the ioctls are all named 48 * differently: 49 * 50 * - GET_UNIQUE ioctl, implemented by drm_getunique is wrapped up in libdrm 51 * through the drmGetBusid function. 52 * - The libdrm drmSetBusid function is backed by the SET_UNIQUE ioctl. All 53 * that code is nerved in the kernel with drm_invalid_op(). 54 * - The internal set_busid kernel functions and driver callbacks are 55 * exclusively use by the SET_VERSION ioctl, because only drm 1.0 (which is 56 * nerved) allowed userspace to set the busid through the above ioctl. 57 * - Other ioctls and functions involved are named consistently. 58 * 59 * For anyone wondering what's the difference between drm 1.1 and 1.4: Correctly 60 * handling pci domains in the busid on ppc. Doing this correctly was only 61 * implemented in libdrm in 2010, hence can't be nerved yet. No one knows what's 62 * special with drm 1.2 and 1.3. 63 * 64 * Now the actual horror story of how device lookup in drm works. At large, 65 * there's 2 different ways, either by busid, or by device driver name. 66 * 67 * Opening by busid is fairly simple: 68 * 69 * 1. First call SET_VERSION to make sure pci domains are handled properly. As a 70 * side-effect this fills out the unique name in the master structure. 71 * 2. Call GET_UNIQUE to read out the unique name from the master structure, 72 * which matches the busid thanks to step 1. If it doesn't, proceed to try 73 * the next device node. 74 * 75 * Opening by name is slightly different: 76 * 77 * 1. Directly call VERSION to get the version and to match against the driver 78 * name returned by that ioctl. Note that SET_VERSION is not called, which 79 * means the the unique name for the master node just opening is _not_ filled 80 * out. This despite that with current drm device nodes are always bound to 81 * one device, and can't be runtime assigned like with drm 1.0. 82 * 2. Match driver name. If it mismatches, proceed to the next device node. 83 * 3. Call GET_UNIQUE, and check whether the unique name has length zero (by 84 * checking that the first byte in the string is 0). If that's not the case 85 * libdrm skips and proceeds to the next device node. Probably this is just 86 * copypasta from drm 1.0 times where a set unique name meant that the driver 87 * was in use already, but that's just conjecture. 88 * 89 * Long story short: To keep the open by name logic working, GET_UNIQUE must 90 * _not_ return a unique string when SET_VERSION hasn't been called yet, 91 * otherwise libdrm breaks. Even when that unique string can't ever change, and 92 * is totally irrelevant for actually opening the device because runtime 93 * assignable device instances were only support in drm 1.0, which is long dead. 94 * But the libdrm code in drmOpenByName somehow survived, hence this can't be 95 * broken. 96 */ 97 98 static int drm_version(struct drm_device *dev, void *data, 99 struct drm_file *file_priv); 100 101 /* 102 * Get the bus id. 103 * 104 * \param inode device inode. 105 * \param file_priv DRM file private. 106 * \param cmd command. 107 * \param arg user argument, pointing to a drm_unique structure. 108 * \return zero on success or a negative number on failure. 109 * 110 * Copies the bus id from drm_device::unique into user space. 111 */ 112 static int drm_getunique(struct drm_device *dev, void *data, 113 struct drm_file *file_priv) 114 { 115 struct drm_unique *u = data; 116 117 if (u->unique_len >= dev->unique_len) { 118 if (copy_to_user(u->unique, dev->unique, dev->unique_len)) 119 return -EFAULT; 120 } 121 u->unique_len = dev->unique_len; 122 123 return 0; 124 } 125 126 static int drm_set_busid(struct drm_device *dev, struct drm_file *file_priv) 127 { 128 129 DRM_LOCK(dev); 130 131 dev->unique_len = 20; 132 dev->unique = kmalloc(dev->unique_len + 1, M_DRM, M_WAITOK | M_NULLOK); 133 if (dev->unique == NULL) { 134 DRM_UNLOCK(dev); 135 return -ENOMEM; 136 } 137 138 ksnprintf(dev->unique, dev->unique_len, "pci:%04x:%02x:%02x.%1x", 139 dev->pci_domain, dev->pci_bus, dev->pci_slot, dev->pci_func); 140 141 DRM_UNLOCK(dev); 142 143 return 0; 144 } 145 146 /* 147 * Get client information. 148 * 149 * \param inode device inode. 150 * \param file_priv DRM file private. 151 * \param cmd command. 152 * \param arg user argument, pointing to a drm_client structure. 153 * 154 * \return zero on success or a negative number on failure. 155 * 156 * Searches for the client with the specified index and copies its information 157 * into userspace 158 */ 159 static int drm_getclient(struct drm_device *dev, void *data, 160 struct drm_file *file_priv) 161 { 162 struct drm_client *client = data; 163 164 /* 165 * Hollowed-out getclient ioctl to keep some dead old drm tests/tools 166 * not breaking completely. Userspace tools stop enumerating one they 167 * get -EINVAL, hence this is the return value we need to hand back for 168 * no clients tracked. 169 * 170 * Unfortunately some clients (*cough* libva *cough*) use this in a fun 171 * attempt to figure out whether they're authenticated or not. Since 172 * that's the only thing they care about, give it to the directly 173 * instead of walking one giant list. 174 */ 175 if (client->idx == 0) { 176 client->auth = file_priv->authenticated; 177 client->pid = curproc->p_pid; 178 client->uid = -1; 179 client->magic = 0; 180 client->iocs = 0; 181 182 return 0; 183 } else { 184 return -EINVAL; 185 } 186 } 187 188 /* 189 * Get statistics information. 190 * 191 * \param inode device inode. 192 * \param file_priv DRM file private. 193 * \param cmd command. 194 * \param arg user argument, pointing to a drm_stats structure. 195 * 196 * \return zero on success or a negative number on failure. 197 */ 198 static int drm_getstats(struct drm_device *dev, void *data, 199 struct drm_file *file_priv) 200 { 201 struct drm_stats *stats = data; 202 203 /* Clear stats to prevent userspace from eating its stack garbage. */ 204 memset(stats, 0, sizeof(*stats)); 205 206 return 0; 207 } 208 209 /* 210 * Get device/driver capabilities 211 */ 212 static int drm_getcap(struct drm_device *dev, void *data, struct drm_file *file_priv) 213 { 214 struct drm_get_cap *req = data; 215 struct drm_crtc *crtc; 216 217 req->value = 0; 218 switch (req->capability) { 219 case DRM_CAP_DUMB_BUFFER: 220 if (dev->driver->dumb_create) 221 req->value = 1; 222 break; 223 case DRM_CAP_VBLANK_HIGH_CRTC: 224 req->value = 1; 225 break; 226 case DRM_CAP_DUMB_PREFERRED_DEPTH: 227 req->value = dev->mode_config.preferred_depth; 228 break; 229 case DRM_CAP_DUMB_PREFER_SHADOW: 230 req->value = dev->mode_config.prefer_shadow; 231 break; 232 case DRM_CAP_PRIME: 233 #ifndef __DragonFly__ 234 req->value |= dev->driver->prime_fd_to_handle ? DRM_PRIME_CAP_IMPORT : 0; 235 req->value |= dev->driver->prime_handle_to_fd ? DRM_PRIME_CAP_EXPORT : 0; 236 #endif 237 break; 238 case DRM_CAP_TIMESTAMP_MONOTONIC: 239 req->value = drm_timestamp_monotonic; 240 break; 241 case DRM_CAP_ASYNC_PAGE_FLIP: 242 req->value = dev->mode_config.async_page_flip; 243 break; 244 case DRM_CAP_PAGE_FLIP_TARGET: 245 if (drm_core_check_feature(dev, DRIVER_MODESET)) { 246 req->value = 1; 247 drm_for_each_crtc(crtc, dev) { 248 if (!crtc->funcs->page_flip_target) 249 req->value = 0; 250 } 251 } 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 case DRM_CAP_CRTC_IN_VBLANK_EVENT: 269 req->value = 1; 270 break; 271 default: 272 return -EINVAL; 273 } 274 return 0; 275 } 276 277 /* 278 * Set device/driver capabilities 279 */ 280 static int 281 drm_setclientcap(struct drm_device *dev, void *data, struct drm_file *file_priv) 282 { 283 struct drm_set_client_cap *req = data; 284 285 switch (req->capability) { 286 case DRM_CLIENT_CAP_STEREO_3D: 287 if (req->value > 1) 288 return -EINVAL; 289 file_priv->stereo_allowed = req->value; 290 break; 291 case DRM_CLIENT_CAP_UNIVERSAL_PLANES: 292 if (req->value > 1) 293 return -EINVAL; 294 file_priv->universal_planes = req->value; 295 break; 296 case DRM_CLIENT_CAP_ATOMIC: 297 if (!drm_core_check_feature(dev, DRIVER_ATOMIC)) 298 return -EINVAL; 299 if (req->value > 1) 300 return -EINVAL; 301 file_priv->atomic = req->value; 302 file_priv->universal_planes = req->value; 303 break; 304 default: 305 return -EINVAL; 306 } 307 308 return 0; 309 } 310 311 /* 312 * Setversion ioctl. 313 * 314 * \param inode device inode. 315 * \param file_priv DRM file private. 316 * \param cmd command. 317 * \param arg user argument, pointing to a drm_lock structure. 318 * \return zero on success or negative number on failure. 319 * 320 * Sets the requested interface version 321 */ 322 static int drm_setversion(struct drm_device *dev, void *data, struct drm_file *file_priv) 323 { 324 struct drm_set_version *sv = data; 325 int if_version, retcode = 0; 326 327 if (sv->drm_di_major != -1) { 328 if (sv->drm_di_major != DRM_IF_MAJOR || 329 sv->drm_di_minor < 0 || sv->drm_di_minor > DRM_IF_MINOR) { 330 retcode = -EINVAL; 331 goto done; 332 } 333 if_version = DRM_IF_VERSION(sv->drm_di_major, 334 sv->drm_di_minor); 335 dev->if_version = max(if_version, dev->if_version); 336 if (sv->drm_di_minor >= 1) { 337 /* 338 * Version 1.1 includes tying of DRM to specific device 339 * Version 1.4 has proper PCI domain support 340 */ 341 retcode = drm_set_busid(dev, file_priv); 342 if (retcode) 343 goto done; 344 } 345 } 346 347 if (sv->drm_dd_major != -1) { 348 if (sv->drm_dd_major != dev->driver->major || 349 sv->drm_dd_minor < 0 || sv->drm_dd_minor > 350 dev->driver->minor) { 351 retcode = -EINVAL; 352 goto done; 353 } 354 } 355 356 done: 357 sv->drm_di_major = DRM_IF_MAJOR; 358 sv->drm_di_minor = DRM_IF_MINOR; 359 sv->drm_dd_major = dev->driver->major; 360 sv->drm_dd_minor = dev->driver->minor; 361 362 return retcode; 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 static int drm_version_initial; 445 struct drm_version *version = data; 446 int err; 447 448 if (drm_version_initial == 0) { 449 int dummy; 450 451 ++drm_version_initial; 452 tsleep(&dummy, 0, "SDELAY", hz*2); 453 } 454 455 version->version_major = dev->driver->major; 456 version->version_minor = dev->driver->minor; 457 version->version_patchlevel = dev->driver->patchlevel; 458 err = drm_copy_field(version->name, &version->name_len, 459 dev->driver->name); 460 if (!err) 461 err = drm_copy_field(version->date, &version->date_len, 462 dev->driver->date); 463 if (!err) 464 err = drm_copy_field(version->desc, &version->desc_len, 465 dev->driver->desc); 466 467 return err; 468 } 469 470 /* 471 * drm_ioctl_permit - Check ioctl permissions against caller 472 * 473 * @flags: ioctl permission flags. 474 * @file_priv: Pointer to struct drm_file identifying the caller. 475 * 476 * Checks whether the caller is allowed to run an ioctl with the 477 * indicated permissions. If so, returns zero. Otherwise returns an 478 * error code suitable for ioctl return. 479 */ 480 int drm_ioctl_permit(u32 flags, struct drm_file *file_priv) 481 { 482 /* ROOT_ONLY is only for CAP_SYS_ADMIN */ 483 if (unlikely((flags & DRM_ROOT_ONLY) && !capable(CAP_SYS_ADMIN))) 484 return -EACCES; 485 486 /* AUTH is only for authenticated or render client */ 487 if (unlikely((flags & DRM_AUTH) && !file_priv->authenticated)) 488 return -EACCES; 489 490 /* MASTER is only for master or control clients */ 491 if (unlikely((flags & DRM_MASTER) && 492 !drm_is_current_master(file_priv) && 493 !drm_is_control_client(file_priv))) 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, DRM_UNLOCKED), 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_invalid_op, 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_UNLOCKED|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_UNLOCKED|DRM_ROOT_ONLY), 538 DRM_IOCTL_DEF(DRM_IOCTL_DROP_MASTER, drm_dropmaster_ioctl, DRM_UNLOCKED|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 u_long cmd = ap->a_cmd; 644 struct drm_file *file_priv = filp->private_data; 645 struct drm_device *dev; 646 const struct drm_ioctl_desc *ioctl = NULL; 647 drm_ioctl_t *func; 648 unsigned int nr = DRM_IOCTL_NR(cmd); 649 int retcode = -EINVAL; 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 (is_driver_ioctl) { 661 /* driver ioctl */ 662 if (nr - DRM_COMMAND_BASE >= dev->driver->num_ioctls) 663 goto err_i1; 664 ioctl = &dev->driver->ioctls[nr - DRM_COMMAND_BASE]; 665 } else { 666 /* core ioctl */ 667 if (nr >= DRM_CORE_IOCTL_COUNT) 668 goto err_i1; 669 ioctl = &drm_ioctls[nr]; 670 } 671 672 DRM_DEBUG_IOCTL("pid=%d, dev=0x%lx, auth=%d, %s\n", 673 DRM_CURRENTPID, 674 (long)dev->dev, 675 file_priv->authenticated, ioctl->name); 676 677 /* Do not trust userspace, use our own definition */ 678 func = ioctl->func; 679 680 if (unlikely(!func)) { 681 DRM_DEBUG("no function\n"); 682 retcode = -EINVAL; 683 goto err_i1; 684 } 685 686 retcode = drm_ioctl_permit(ioctl->flags, file_priv); 687 if (unlikely(retcode)) 688 goto err_i1; 689 690 /* Enforce sane locking for modern driver ioctls. Core ioctls are 691 * too messy still. */ 692 if ((!drm_core_check_feature(dev, DRIVER_LEGACY) && is_driver_ioctl) || 693 (ioctl->flags & DRM_UNLOCKED)) 694 retcode = -func(dev, data, file_priv); 695 else { 696 mutex_lock(&drm_global_mutex); 697 retcode = -func(dev, data, file_priv); 698 mutex_unlock(&drm_global_mutex); 699 } 700 if (retcode == ERESTARTSYS) 701 retcode = EINTR; 702 703 err_i1: 704 if (!ioctl) 705 DRM_DEBUG_FIOCTL("invalid ioctl: pid=%d, dev=0x%lx, auth=%d, cmd=0x%02lx, nr=0x%02x\n", 706 DRM_CURRENTPID, 707 (long)dev->dev, 708 file_priv->authenticated, cmd, nr); 709 710 if (retcode) 711 DRM_DEBUG_FIOCTL("ret = %d\n", retcode); 712 return retcode; 713 } 714 EXPORT_SYMBOL(drm_ioctl); 715 716 /** 717 * drm_ioctl_flags - Check for core ioctl and return ioctl permission flags 718 * @nr: ioctl number 719 * @flags: where to return the ioctl permission flags 720 * 721 * This ioctl is only used by the vmwgfx driver to augment the access checks 722 * done by the drm core and insofar a pretty decent layering violation. This 723 * shouldn't be used by any drivers. 724 * 725 * Returns: 726 * True if the @nr corresponds to a DRM core ioctl number, false otherwise. 727 */ 728 bool drm_ioctl_flags(unsigned int nr, unsigned int *flags) 729 { 730 if ((nr >= DRM_COMMAND_END && nr < DRM_CORE_IOCTL_COUNT) || 731 (nr < DRM_COMMAND_BASE)) { 732 *flags = drm_ioctls[nr].flags; 733 return true; 734 } 735 736 return false; 737 } 738 EXPORT_SYMBOL(drm_ioctl_flags); 739