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/filio.h> 32 33 #include <drm/drm_ioctl.h> 34 #include <drm/drmP.h> 35 #ifdef __linux__ 36 #include <drm/drm_auth.h> 37 #include "drm_legacy.h" 38 #endif 39 #include "drm_internal.h" 40 #include "drm_crtc_internal.h" 41 42 #include <linux/pci.h> 43 #include <linux/export.h> 44 #include <linux/nospec.h> 45 46 int drm_setunique(struct drm_device *, void *, struct drm_file *); 47 48 /** 49 * DOC: getunique and setversion story 50 * 51 * BEWARE THE DRAGONS! MIND THE TRAPDOORS! 52 * 53 * In an attempt to warn anyone else who's trying to figure out what's going 54 * on here, I'll try to summarize the story. First things first, let's clear up 55 * the names, because the kernel internals, libdrm and the ioctls are all named 56 * differently: 57 * 58 * - GET_UNIQUE ioctl, implemented by drm_getunique is wrapped up in libdrm 59 * through the drmGetBusid function. 60 * - The libdrm drmSetBusid function is backed by the SET_UNIQUE ioctl. All 61 * that code is nerved in the kernel with drm_invalid_op(). 62 * - The internal set_busid kernel functions and driver callbacks are 63 * exclusively use by the SET_VERSION ioctl, because only drm 1.0 (which is 64 * nerved) allowed userspace to set the busid through the above ioctl. 65 * - Other ioctls and functions involved are named consistently. 66 * 67 * For anyone wondering what's the difference between drm 1.1 and 1.4: Correctly 68 * handling pci domains in the busid on ppc. Doing this correctly was only 69 * implemented in libdrm in 2010, hence can't be nerved yet. No one knows what's 70 * special with drm 1.2 and 1.3. 71 * 72 * Now the actual horror story of how device lookup in drm works. At large, 73 * there's 2 different ways, either by busid, or by device driver name. 74 * 75 * Opening by busid is fairly simple: 76 * 77 * 1. First call SET_VERSION to make sure pci domains are handled properly. As a 78 * side-effect this fills out the unique name in the master structure. 79 * 2. Call GET_UNIQUE to read out the unique name from the master structure, 80 * which matches the busid thanks to step 1. If it doesn't, proceed to try 81 * the next device node. 82 * 83 * Opening by name is slightly different: 84 * 85 * 1. Directly call VERSION to get the version and to match against the driver 86 * name returned by that ioctl. Note that SET_VERSION is not called, which 87 * means the the unique name for the master node just opening is _not_ filled 88 * out. This despite that with current drm device nodes are always bound to 89 * one device, and can't be runtime assigned like with drm 1.0. 90 * 2. Match driver name. If it mismatches, proceed to the next device node. 91 * 3. Call GET_UNIQUE, and check whether the unique name has length zero (by 92 * checking that the first byte in the string is 0). If that's not the case 93 * libdrm skips and proceeds to the next device node. Probably this is just 94 * copypasta from drm 1.0 times where a set unique name meant that the driver 95 * was in use already, but that's just conjecture. 96 * 97 * Long story short: To keep the open by name logic working, GET_UNIQUE must 98 * _not_ return a unique string when SET_VERSION hasn't been called yet, 99 * otherwise libdrm breaks. Even when that unique string can't ever change, and 100 * is totally irrelevant for actually opening the device because runtime 101 * assignable device instances were only support in drm 1.0, which is long dead. 102 * But the libdrm code in drmOpenByName somehow survived, hence this can't be 103 * broken. 104 */ 105 106 /* 107 * Get the bus id. 108 * 109 * \param inode device inode. 110 * \param file_priv DRM file private. 111 * \param cmd command. 112 * \param arg user argument, pointing to a drm_unique structure. 113 * \return zero on success or a negative number on failure. 114 * 115 * Copies the bus id from drm_device::unique into user space. 116 */ 117 int drm_getunique(struct drm_device *dev, void *data, 118 struct drm_file *file_priv) 119 { 120 struct drm_unique *u = data; 121 122 if (u->unique_len >= dev->unique_len) { 123 if (DRM_COPY_TO_USER(u->unique, dev->unique, dev->unique_len)) 124 return -EFAULT; 125 } 126 u->unique_len = dev->unique_len; 127 128 return 0; 129 } 130 131 /* 132 * Get client information. 133 * 134 * \param inode device inode. 135 * \param file_priv DRM file private. 136 * \param cmd command. 137 * \param arg user argument, pointing to a drm_client structure. 138 * 139 * \return zero on success or a negative number on failure. 140 * 141 * Searches for the client with the specified index and copies its information 142 * into userspace 143 */ 144 int drm_getclient(struct drm_device *dev, void *data, 145 struct drm_file *file_priv) 146 { 147 struct drm_client *client = data; 148 149 /* 150 * Hollowed-out getclient ioctl to keep some dead old drm tests/tools 151 * not breaking completely. Userspace tools stop enumerating one they 152 * get -EINVAL, hence this is the return value we need to hand back for 153 * no clients tracked. 154 * 155 * Unfortunately some clients (*cough* libva *cough*) use this in a fun 156 * attempt to figure out whether they're authenticated or not. Since 157 * that's the only thing they care about, give it to the directly 158 * instead of walking one giant list. 159 */ 160 if (client->idx == 0) { 161 client->auth = file_priv->authenticated; 162 #ifdef __linux__ 163 client->pid = task_pid_vnr(current); 164 client->uid = overflowuid; 165 #else 166 client->pid = curproc->p_p->ps_pid; 167 client->uid = 0xfffe; 168 #endif 169 client->magic = 0; 170 client->iocs = 0; 171 172 return 0; 173 } else { 174 return -EINVAL; 175 } 176 } 177 178 /* 179 * Get statistics information. 180 * 181 * \param inode device inode. 182 * \param file_priv DRM file private. 183 * \param cmd command. 184 * \param arg user argument, pointing to a drm_stats structure. 185 * 186 * \return zero on success or a negative number on failure. 187 */ 188 static int drm_getstats(struct drm_device *dev, void *data, 189 struct drm_file *file_priv) 190 { 191 struct drm_stats *stats = data; 192 193 /* Clear stats to prevent userspace from eating its stack garbage. */ 194 memset(stats, 0, sizeof(*stats)); 195 196 return 0; 197 } 198 199 /* 200 * Get device/driver capabilities 201 */ 202 static int drm_getcap(struct drm_device *dev, void *data, struct drm_file *file_priv) 203 { 204 struct drm_get_cap *req = data; 205 struct drm_crtc *crtc; 206 207 req->value = 0; 208 209 /* Only some caps make sense with UMS/render-only drivers. */ 210 switch (req->capability) { 211 case DRM_CAP_TIMESTAMP_MONOTONIC: 212 req->value = 1; 213 return 0; 214 case DRM_CAP_PRIME: 215 req->value |= dev->driver->prime_fd_to_handle ? DRM_PRIME_CAP_IMPORT : 0; 216 req->value |= dev->driver->prime_handle_to_fd ? DRM_PRIME_CAP_EXPORT : 0; 217 return 0; 218 case DRM_CAP_SYNCOBJ: 219 req->value = drm_core_check_feature(dev, DRIVER_SYNCOBJ); 220 return 0; 221 } 222 223 /* Other caps only work with KMS drivers */ 224 if (!drm_core_check_feature(dev, DRIVER_MODESET)) 225 return -ENOTSUPP; 226 227 switch (req->capability) { 228 case DRM_CAP_DUMB_BUFFER: 229 if (dev->driver->dumb_create) 230 req->value = 1; 231 break; 232 case DRM_CAP_VBLANK_HIGH_CRTC: 233 req->value = 1; 234 break; 235 case DRM_CAP_DUMB_PREFERRED_DEPTH: 236 req->value = dev->mode_config.preferred_depth; 237 break; 238 case DRM_CAP_DUMB_PREFER_SHADOW: 239 req->value = dev->mode_config.prefer_shadow; 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 req->value = 1; 246 drm_for_each_crtc(crtc, dev) { 247 if (!crtc->funcs->page_flip_target) 248 req->value = 0; 249 } 250 break; 251 case DRM_CAP_CURSOR_WIDTH: 252 if (dev->mode_config.cursor_width) 253 req->value = dev->mode_config.cursor_width; 254 else 255 req->value = 64; 256 break; 257 case DRM_CAP_CURSOR_HEIGHT: 258 if (dev->mode_config.cursor_height) 259 req->value = dev->mode_config.cursor_height; 260 else 261 req->value = 64; 262 break; 263 case DRM_CAP_ADDFB2_MODIFIERS: 264 req->value = dev->mode_config.allow_fb_modifiers; 265 break; 266 case DRM_CAP_CRTC_IN_VBLANK_EVENT: 267 req->value = 1; 268 break; 269 default: 270 return -EINVAL; 271 } 272 return 0; 273 } 274 275 /* 276 * Set device/driver capabilities 277 */ 278 static int 279 drm_setclientcap(struct drm_device *dev, void *data, struct drm_file *file_priv) 280 { 281 struct drm_set_client_cap *req = data; 282 283 switch (req->capability) { 284 case DRM_CLIENT_CAP_STEREO_3D: 285 if (req->value > 1) 286 return -EINVAL; 287 file_priv->stereo_allowed = req->value; 288 break; 289 case DRM_CLIENT_CAP_UNIVERSAL_PLANES: 290 if (req->value > 1) 291 return -EINVAL; 292 file_priv->universal_planes = req->value; 293 break; 294 case DRM_CLIENT_CAP_ATOMIC: 295 if (!drm_core_check_feature(dev, DRIVER_ATOMIC)) 296 return -EINVAL; 297 if (req->value > 1) 298 return -EINVAL; 299 file_priv->atomic = req->value; 300 file_priv->universal_planes = req->value; 301 /* 302 * No atomic user-space blows up on aspect ratio mode bits. 303 */ 304 file_priv->aspect_ratio_allowed = req->value; 305 break; 306 case DRM_CLIENT_CAP_ASPECT_RATIO: 307 if (req->value > 1) 308 return -EINVAL; 309 file_priv->aspect_ratio_allowed = req->value; 310 break; 311 #ifdef notyet 312 case DRM_CLIENT_CAP_WRITEBACK_CONNECTORS: 313 if (!file_priv->atomic) 314 return -EINVAL; 315 if (req->value > 1) 316 return -EINVAL; 317 file_priv->writeback_connectors = req->value; 318 break; 319 #endif 320 default: 321 return -EINVAL; 322 } 323 324 return 0; 325 } 326 327 /* 328 * Setversion ioctl. 329 * 330 * \param inode device inode. 331 * \param file_priv DRM file private. 332 * \param cmd command. 333 * \param arg user argument, pointing to a drm_lock structure. 334 * \return zero on success or negative number on failure. 335 * 336 * Sets the requested interface version 337 */ 338 static int drm_setversion(struct drm_device *dev, void *data, struct drm_file *file_priv) 339 { 340 struct drm_set_version ver, *sv = data; 341 int if_version; 342 343 /* Save the incoming data, and set the response before continuing 344 * any further. 345 */ 346 ver = *sv; 347 sv->drm_di_major = DRM_IF_MAJOR; 348 sv->drm_di_minor = DRM_IF_MINOR; 349 sv->drm_dd_major = dev->driver->major; 350 sv->drm_dd_minor = dev->driver->minor; 351 352 /* 353 * We no longer support interface versions less than 1.1, so error 354 * out if the xserver is too old. 1.1 always ties the drm to a 355 * certain busid, this was done on attach 356 */ 357 if (ver.drm_di_major != -1) { 358 if (ver.drm_di_major != DRM_IF_MAJOR || ver.drm_di_minor < 1 || 359 ver.drm_di_minor > DRM_IF_MINOR) { 360 return -EINVAL; 361 } 362 if_version = DRM_IF_VERSION(ver.drm_di_major, ver.drm_dd_minor); 363 dev->if_version = imax(if_version, dev->if_version); 364 } 365 366 if (ver.drm_dd_major != -1) { 367 if (ver.drm_dd_major != dev->driver->major || 368 ver.drm_dd_minor < 0 || 369 ver.drm_dd_minor > dev->driver->minor) 370 return -EINVAL; 371 } 372 373 return 0; 374 } 375 376 /** 377 * drm_noop - DRM no-op ioctl implemntation 378 * @dev: DRM device for the ioctl 379 * @data: data pointer for the ioctl 380 * @file_priv: DRM file for the ioctl call 381 * 382 * This no-op implementation for drm ioctls is useful for deprecated 383 * functionality where we can't return a failure code because existing userspace 384 * checks the result of the ioctl, but doesn't care about the action. 385 * 386 * Always returns successfully with 0. 387 */ 388 int drm_noop(struct drm_device *dev, void *data, 389 struct drm_file *file_priv) 390 { 391 return 0; 392 } 393 EXPORT_SYMBOL(drm_noop); 394 395 /** 396 * drm_invalid_op - DRM invalid ioctl implemntation 397 * @dev: DRM device for the ioctl 398 * @data: data pointer for the ioctl 399 * @file_priv: DRM file for the ioctl call 400 * 401 * This no-op implementation for drm ioctls is useful for deprecated 402 * functionality where we really don't want to allow userspace to call the ioctl 403 * any more. This is the case for old ums interfaces for drivers that 404 * transitioned to kms gradually and so kept the old legacy tables around. This 405 * only applies to radeon and i915 kms drivers, other drivers shouldn't need to 406 * use this function. 407 * 408 * Always fails with a return value of -EINVAL. 409 */ 410 int drm_invalid_op(struct drm_device *dev, void *data, 411 struct drm_file *file_priv) 412 { 413 return -EINVAL; 414 } 415 EXPORT_SYMBOL(drm_invalid_op); 416 417 /* 418 * Get version information 419 * 420 * \param inode device inode. 421 * \param filp file pointer. 422 * \param cmd command. 423 * \param arg user argument, pointing to a drm_version structure. 424 * \return zero on success or negative number on failure. 425 * 426 * Fills in the version information in \p arg. 427 */ 428 int drm_version(struct drm_device *dev, void *data, 429 struct drm_file *file_priv) 430 { 431 struct drm_version *version = data; 432 int len; 433 434 #define DRM_COPY(name, value) \ 435 len = strlen( value ); \ 436 if ( len > name##_len ) len = name##_len; \ 437 name##_len = strlen( value ); \ 438 if ( len && name ) { \ 439 if ( DRM_COPY_TO_USER( name, value, len ) ) \ 440 return -EFAULT; \ 441 } 442 443 version->version_major = dev->driver->major; 444 version->version_minor = dev->driver->minor; 445 version->version_patchlevel = dev->driver->patchlevel; 446 447 DRM_COPY(version->name, dev->driver->name); 448 DRM_COPY(version->date, dev->driver->date); 449 DRM_COPY(version->desc, dev->driver->desc); 450 451 return 0; 452 } 453 454 #define DRM_IOCTL_DEF(ioctl, _func, _flags) \ 455 [DRM_IOCTL_NR(ioctl)] = {.cmd = ioctl, .func = _func, .flags = _flags, .cmd_drv = 0} 456 457 /* Ioctl table */ 458 static const struct drm_ioctl_desc drm_ioctls[] = { 459 DRM_IOCTL_DEF(DRM_IOCTL_VERSION, drm_version, 460 DRM_UNLOCKED|DRM_RENDER_ALLOW), 461 DRM_IOCTL_DEF(DRM_IOCTL_GET_UNIQUE, drm_getunique, DRM_UNLOCKED), 462 DRM_IOCTL_DEF(DRM_IOCTL_GET_MAGIC, drm_getmagic, DRM_UNLOCKED), 463 #ifdef __linux__ 464 DRM_IOCTL_DEF(DRM_IOCTL_IRQ_BUSID, drm_irq_by_busid, DRM_MASTER|DRM_ROOT_ONLY), 465 DRM_IOCTL_DEF(DRM_IOCTL_GET_MAP, drm_legacy_getmap_ioctl, DRM_UNLOCKED), 466 #endif 467 DRM_IOCTL_DEF(DRM_IOCTL_GET_CLIENT, drm_getclient, DRM_UNLOCKED), 468 DRM_IOCTL_DEF(DRM_IOCTL_GET_STATS, drm_getstats, DRM_UNLOCKED), 469 DRM_IOCTL_DEF(DRM_IOCTL_GET_CAP, drm_getcap, DRM_UNLOCKED|DRM_RENDER_ALLOW), 470 DRM_IOCTL_DEF(DRM_IOCTL_SET_CLIENT_CAP, drm_setclientcap, DRM_UNLOCKED), 471 DRM_IOCTL_DEF(DRM_IOCTL_SET_VERSION, drm_setversion, DRM_UNLOCKED | DRM_MASTER), 472 473 DRM_IOCTL_DEF(DRM_IOCTL_SET_UNIQUE, drm_invalid_op, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 474 DRM_IOCTL_DEF(DRM_IOCTL_BLOCK, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 475 DRM_IOCTL_DEF(DRM_IOCTL_UNBLOCK, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 476 DRM_IOCTL_DEF(DRM_IOCTL_AUTH_MAGIC, drm_authmagic, DRM_AUTH|DRM_UNLOCKED|DRM_MASTER), 477 478 #ifdef __linux__ 479 DRM_IOCTL_DEF(DRM_IOCTL_ADD_MAP, drm_legacy_addmap_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 480 DRM_IOCTL_DEF(DRM_IOCTL_RM_MAP, drm_legacy_rmmap_ioctl, DRM_AUTH), 481 482 DRM_IOCTL_DEF(DRM_IOCTL_SET_SAREA_CTX, drm_legacy_setsareactx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 483 DRM_IOCTL_DEF(DRM_IOCTL_GET_SAREA_CTX, drm_legacy_getsareactx, DRM_AUTH), 484 #else 485 DRM_IOCTL_DEF(DRM_IOCTL_GET_PCIINFO, drm_getpciinfo, DRM_UNLOCKED|DRM_RENDER_ALLOW), 486 487 DRM_IOCTL_DEF(DRM_IOCTL_SET_SAREA_CTX, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 488 DRM_IOCTL_DEF(DRM_IOCTL_GET_SAREA_CTX, drm_noop, DRM_AUTH), 489 #endif 490 491 #ifdef __linux__ 492 DRM_IOCTL_DEF(DRM_IOCTL_SET_MASTER, drm_setmaster_ioctl, DRM_UNLOCKED|DRM_ROOT_ONLY), 493 DRM_IOCTL_DEF(DRM_IOCTL_DROP_MASTER, drm_dropmaster_ioctl, DRM_UNLOCKED|DRM_ROOT_ONLY), 494 #else 495 /* On OpenBSD xorg privdrop has already occurred before this point */ 496 DRM_IOCTL_DEF(DRM_IOCTL_SET_MASTER, drm_noop, DRM_UNLOCKED|DRM_RENDER_ALLOW), 497 DRM_IOCTL_DEF(DRM_IOCTL_DROP_MASTER, drm_noop, DRM_UNLOCKED|DRM_RENDER_ALLOW), 498 #endif 499 500 #ifdef __linux__ 501 DRM_IOCTL_DEF(DRM_IOCTL_ADD_CTX, drm_legacy_addctx, DRM_AUTH|DRM_ROOT_ONLY), 502 DRM_IOCTL_DEF(DRM_IOCTL_RM_CTX, drm_legacy_rmctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 503 #endif 504 DRM_IOCTL_DEF(DRM_IOCTL_MOD_CTX, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 505 #ifdef __linux__ 506 DRM_IOCTL_DEF(DRM_IOCTL_GET_CTX, drm_legacy_getctx, DRM_AUTH), 507 DRM_IOCTL_DEF(DRM_IOCTL_SWITCH_CTX, drm_legacy_switchctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 508 DRM_IOCTL_DEF(DRM_IOCTL_NEW_CTX, drm_legacy_newctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 509 #else 510 DRM_IOCTL_DEF(DRM_IOCTL_SWITCH_CTX, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 511 DRM_IOCTL_DEF(DRM_IOCTL_NEW_CTX, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 512 #endif 513 #ifdef __linux__ 514 DRM_IOCTL_DEF(DRM_IOCTL_RES_CTX, drm_legacy_resctx, DRM_AUTH), 515 #endif 516 517 DRM_IOCTL_DEF(DRM_IOCTL_ADD_DRAW, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 518 DRM_IOCTL_DEF(DRM_IOCTL_RM_DRAW, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 519 520 #ifdef __linux__ 521 DRM_IOCTL_DEF(DRM_IOCTL_LOCK, drm_legacy_lock, DRM_AUTH), 522 DRM_IOCTL_DEF(DRM_IOCTL_UNLOCK, drm_legacy_unlock, DRM_AUTH), 523 #endif 524 525 DRM_IOCTL_DEF(DRM_IOCTL_FINISH, drm_noop, DRM_AUTH), 526 527 #ifdef __linux__ 528 DRM_IOCTL_DEF(DRM_IOCTL_ADD_BUFS, drm_legacy_addbufs, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 529 DRM_IOCTL_DEF(DRM_IOCTL_MARK_BUFS, drm_legacy_markbufs, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 530 DRM_IOCTL_DEF(DRM_IOCTL_INFO_BUFS, drm_legacy_infobufs, DRM_AUTH), 531 #else 532 DRM_IOCTL_DEF(DRM_IOCTL_MARK_BUFS, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 533 DRM_IOCTL_DEF(DRM_IOCTL_INFO_BUFS, drm_noop, DRM_AUTH), 534 #endif 535 #ifdef __linux__ 536 DRM_IOCTL_DEF(DRM_IOCTL_MAP_BUFS, drm_legacy_mapbufs, DRM_AUTH), 537 DRM_IOCTL_DEF(DRM_IOCTL_FREE_BUFS, drm_legacy_freebufs, DRM_AUTH), 538 DRM_IOCTL_DEF(DRM_IOCTL_DMA, drm_legacy_dma_ioctl, DRM_AUTH), 539 540 DRM_IOCTL_DEF(DRM_IOCTL_CONTROL, drm_legacy_irq_control, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 541 542 #if IS_ENABLED(CONFIG_AGP) 543 DRM_IOCTL_DEF(DRM_IOCTL_AGP_ACQUIRE, drm_agp_acquire_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 544 DRM_IOCTL_DEF(DRM_IOCTL_AGP_RELEASE, drm_agp_release_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 545 DRM_IOCTL_DEF(DRM_IOCTL_AGP_ENABLE, drm_agp_enable_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 546 DRM_IOCTL_DEF(DRM_IOCTL_AGP_INFO, drm_agp_info_ioctl, DRM_AUTH), 547 DRM_IOCTL_DEF(DRM_IOCTL_AGP_ALLOC, drm_agp_alloc_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 548 DRM_IOCTL_DEF(DRM_IOCTL_AGP_FREE, drm_agp_free_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 549 DRM_IOCTL_DEF(DRM_IOCTL_AGP_BIND, drm_agp_bind_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 550 DRM_IOCTL_DEF(DRM_IOCTL_AGP_UNBIND, drm_agp_unbind_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 551 #endif 552 553 DRM_IOCTL_DEF(DRM_IOCTL_SG_ALLOC, drm_legacy_sg_alloc, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 554 DRM_IOCTL_DEF(DRM_IOCTL_SG_FREE, drm_legacy_sg_free, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 555 #endif 556 557 DRM_IOCTL_DEF(DRM_IOCTL_WAIT_VBLANK, drm_wait_vblank_ioctl, DRM_UNLOCKED), 558 559 DRM_IOCTL_DEF(DRM_IOCTL_MODESET_CTL, drm_legacy_modeset_ctl_ioctl, 0), 560 561 DRM_IOCTL_DEF(DRM_IOCTL_UPDATE_DRAW, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 562 563 DRM_IOCTL_DEF(DRM_IOCTL_GEM_CLOSE, drm_gem_close_ioctl, DRM_UNLOCKED|DRM_RENDER_ALLOW), 564 DRM_IOCTL_DEF(DRM_IOCTL_GEM_FLINK, drm_gem_flink_ioctl, DRM_AUTH|DRM_UNLOCKED), 565 DRM_IOCTL_DEF(DRM_IOCTL_GEM_OPEN, drm_gem_open_ioctl, DRM_AUTH|DRM_UNLOCKED), 566 567 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETRESOURCES, drm_mode_getresources, DRM_UNLOCKED), 568 569 DRM_IOCTL_DEF(DRM_IOCTL_PRIME_HANDLE_TO_FD, drm_prime_handle_to_fd_ioctl, DRM_AUTH|DRM_UNLOCKED|DRM_RENDER_ALLOW), 570 DRM_IOCTL_DEF(DRM_IOCTL_PRIME_FD_TO_HANDLE, drm_prime_fd_to_handle_ioctl, DRM_AUTH|DRM_UNLOCKED|DRM_RENDER_ALLOW), 571 572 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPLANERESOURCES, drm_mode_getplane_res, DRM_UNLOCKED), 573 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETCRTC, drm_mode_getcrtc, DRM_UNLOCKED), 574 DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETCRTC, drm_mode_setcrtc, DRM_MASTER|DRM_UNLOCKED), 575 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPLANE, drm_mode_getplane, DRM_UNLOCKED), 576 DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETPLANE, drm_mode_setplane, DRM_MASTER|DRM_UNLOCKED), 577 DRM_IOCTL_DEF(DRM_IOCTL_MODE_CURSOR, drm_mode_cursor_ioctl, DRM_MASTER|DRM_UNLOCKED), 578 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETGAMMA, drm_mode_gamma_get_ioctl, DRM_UNLOCKED), 579 DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETGAMMA, drm_mode_gamma_set_ioctl, DRM_MASTER|DRM_UNLOCKED), 580 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETENCODER, drm_mode_getencoder, DRM_UNLOCKED), 581 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETCONNECTOR, drm_mode_getconnector, DRM_UNLOCKED), 582 DRM_IOCTL_DEF(DRM_IOCTL_MODE_ATTACHMODE, drm_noop, DRM_MASTER|DRM_UNLOCKED), 583 DRM_IOCTL_DEF(DRM_IOCTL_MODE_DETACHMODE, drm_noop, DRM_MASTER|DRM_UNLOCKED), 584 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPROPERTY, drm_mode_getproperty_ioctl, DRM_UNLOCKED), 585 DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETPROPERTY, drm_connector_property_set_ioctl, DRM_MASTER|DRM_UNLOCKED), 586 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPROPBLOB, drm_mode_getblob_ioctl, DRM_UNLOCKED), 587 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETFB, drm_mode_getfb, DRM_UNLOCKED), 588 DRM_IOCTL_DEF(DRM_IOCTL_MODE_ADDFB, drm_mode_addfb_ioctl, DRM_UNLOCKED), 589 DRM_IOCTL_DEF(DRM_IOCTL_MODE_ADDFB2, drm_mode_addfb2, DRM_UNLOCKED), 590 DRM_IOCTL_DEF(DRM_IOCTL_MODE_RMFB, drm_mode_rmfb_ioctl, DRM_UNLOCKED), 591 DRM_IOCTL_DEF(DRM_IOCTL_MODE_PAGE_FLIP, drm_mode_page_flip_ioctl, DRM_MASTER|DRM_UNLOCKED), 592 DRM_IOCTL_DEF(DRM_IOCTL_MODE_DIRTYFB, drm_mode_dirtyfb_ioctl, DRM_MASTER|DRM_UNLOCKED), 593 DRM_IOCTL_DEF(DRM_IOCTL_MODE_CREATE_DUMB, drm_mode_create_dumb_ioctl, DRM_UNLOCKED), 594 DRM_IOCTL_DEF(DRM_IOCTL_MODE_MAP_DUMB, drm_mode_mmap_dumb_ioctl, DRM_UNLOCKED), 595 DRM_IOCTL_DEF(DRM_IOCTL_MODE_DESTROY_DUMB, drm_mode_destroy_dumb_ioctl, DRM_UNLOCKED), 596 DRM_IOCTL_DEF(DRM_IOCTL_MODE_OBJ_GETPROPERTIES, drm_mode_obj_get_properties_ioctl, DRM_UNLOCKED), 597 DRM_IOCTL_DEF(DRM_IOCTL_MODE_OBJ_SETPROPERTY, drm_mode_obj_set_property_ioctl, DRM_MASTER|DRM_UNLOCKED), 598 DRM_IOCTL_DEF(DRM_IOCTL_MODE_CURSOR2, drm_mode_cursor2_ioctl, DRM_MASTER|DRM_UNLOCKED), 599 DRM_IOCTL_DEF(DRM_IOCTL_MODE_ATOMIC, drm_mode_atomic_ioctl, DRM_MASTER|DRM_UNLOCKED), 600 DRM_IOCTL_DEF(DRM_IOCTL_MODE_CREATEPROPBLOB, drm_mode_createblob_ioctl, DRM_UNLOCKED), 601 DRM_IOCTL_DEF(DRM_IOCTL_MODE_DESTROYPROPBLOB, drm_mode_destroyblob_ioctl, DRM_UNLOCKED), 602 603 DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_CREATE, drm_syncobj_create_ioctl, 604 DRM_UNLOCKED|DRM_RENDER_ALLOW), 605 DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_DESTROY, drm_syncobj_destroy_ioctl, 606 DRM_UNLOCKED|DRM_RENDER_ALLOW), 607 DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_HANDLE_TO_FD, drm_syncobj_handle_to_fd_ioctl, 608 DRM_UNLOCKED|DRM_RENDER_ALLOW), 609 DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_FD_TO_HANDLE, drm_syncobj_fd_to_handle_ioctl, 610 DRM_UNLOCKED|DRM_RENDER_ALLOW), 611 DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_WAIT, drm_syncobj_wait_ioctl, 612 DRM_UNLOCKED|DRM_RENDER_ALLOW), 613 DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_RESET, drm_syncobj_reset_ioctl, 614 DRM_UNLOCKED|DRM_RENDER_ALLOW), 615 DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_SIGNAL, drm_syncobj_signal_ioctl, 616 DRM_UNLOCKED|DRM_RENDER_ALLOW), 617 DRM_IOCTL_DEF(DRM_IOCTL_CRTC_GET_SEQUENCE, drm_crtc_get_sequence_ioctl, DRM_UNLOCKED), 618 DRM_IOCTL_DEF(DRM_IOCTL_CRTC_QUEUE_SEQUENCE, drm_crtc_queue_sequence_ioctl, DRM_UNLOCKED), 619 #ifdef __linux__ 620 DRM_IOCTL_DEF(DRM_IOCTL_MODE_CREATE_LEASE, drm_mode_create_lease_ioctl, DRM_MASTER|DRM_UNLOCKED), 621 DRM_IOCTL_DEF(DRM_IOCTL_MODE_LIST_LESSEES, drm_mode_list_lessees_ioctl, DRM_MASTER|DRM_UNLOCKED), 622 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GET_LEASE, drm_mode_get_lease_ioctl, DRM_MASTER|DRM_UNLOCKED), 623 DRM_IOCTL_DEF(DRM_IOCTL_MODE_REVOKE_LEASE, drm_mode_revoke_lease_ioctl, DRM_MASTER|DRM_UNLOCKED), 624 #endif 625 }; 626 627 #define DRM_CORE_IOCTL_COUNT ARRAY_SIZE( drm_ioctls ) 628 629 int 630 pledge_ioctl_drm(struct proc *p, long com, dev_t device) 631 { 632 struct drm_device *dev = drm_get_device_from_kdev(device); 633 unsigned int nr = DRM_IOCTL_NR(com); 634 const struct drm_ioctl_desc *ioctl; 635 636 if (dev == NULL) 637 return EPERM; 638 639 if (nr < DRM_CORE_IOCTL_COUNT && 640 ((nr < DRM_COMMAND_BASE || nr >= DRM_COMMAND_END))) 641 ioctl = &drm_ioctls[nr]; 642 else if (nr >= DRM_COMMAND_BASE && nr < DRM_COMMAND_END && 643 nr < DRM_COMMAND_BASE + dev->driver->num_ioctls) 644 ioctl = &dev->driver->ioctls[nr - DRM_COMMAND_BASE]; 645 else 646 return EPERM; 647 648 if (ioctl->flags & DRM_RENDER_ALLOW) 649 return 0; 650 651 /* 652 * These are dangerous, but we have to allow them until we 653 * have prime/dma-buf support. 654 */ 655 switch (com) { 656 case DRM_IOCTL_GET_MAGIC: 657 case DRM_IOCTL_GEM_OPEN: 658 return 0; 659 } 660 661 return EPERM; 662 } 663 664 int 665 drm_setunique(struct drm_device *dev, void *data, 666 struct drm_file *file_priv) 667 { 668 /* 669 * Deprecated in DRM version 1.1, and will return EBUSY 670 * when setversion has 671 * requested version 1.1 or greater. 672 */ 673 return (-EBUSY); 674 } 675 676 int 677 drm_do_ioctl(struct drm_device *dev, int minor, u_long cmd, caddr_t data) 678 { 679 struct drm_file *file_priv; 680 const struct drm_ioctl_desc *ioctl; 681 drm_ioctl_t *func; 682 unsigned int nr = DRM_IOCTL_NR(cmd); 683 int retcode = -EINVAL; 684 unsigned int usize, asize; 685 686 mutex_lock(&dev->struct_mutex); 687 file_priv = drm_find_file_by_minor(dev, minor); 688 mutex_unlock(&dev->struct_mutex); 689 if (file_priv == NULL) { 690 DRM_ERROR("can't find authenticator\n"); 691 return -EINVAL; 692 } 693 694 DRM_DEBUG("pid=%d, cmd=0x%02lx, nr=0x%02x, dev 0x%lx, auth=%d\n", 695 DRM_CURRENTPID, cmd, (u_int)DRM_IOCTL_NR(cmd), (long)&dev->dev, 696 file_priv->authenticated); 697 698 switch (cmd) { 699 case FIONBIO: 700 case FIOASYNC: 701 return 0; 702 } 703 704 if ((nr >= DRM_CORE_IOCTL_COUNT) && 705 ((nr < DRM_COMMAND_BASE) || (nr >= DRM_COMMAND_END))) 706 return (-EINVAL); 707 if ((nr >= DRM_COMMAND_BASE) && (nr < DRM_COMMAND_END) && 708 (nr < DRM_COMMAND_BASE + dev->driver->num_ioctls)) { 709 uint32_t drv_size; 710 ioctl = &dev->driver->ioctls[nr - DRM_COMMAND_BASE]; 711 drv_size = IOCPARM_LEN(ioctl->cmd_drv); 712 usize = asize = IOCPARM_LEN(cmd); 713 if (drv_size > asize) 714 asize = drv_size; 715 } else if ((nr >= DRM_COMMAND_END) || (nr < DRM_COMMAND_BASE)) { 716 uint32_t drv_size; 717 ioctl = &drm_ioctls[nr]; 718 719 drv_size = IOCPARM_LEN(ioctl->cmd_drv); 720 usize = asize = IOCPARM_LEN(cmd); 721 if (drv_size > asize) 722 asize = drv_size; 723 cmd = ioctl->cmd; 724 } else 725 return (-EINVAL); 726 727 func = ioctl->func; 728 if (!func) { 729 DRM_DEBUG("no function\n"); 730 return (-EINVAL); 731 } 732 733 /* ROOT_ONLY is only for CAP_SYS_ADMIN */ 734 if ((ioctl->flags & DRM_ROOT_ONLY) && !capable(CAP_SYS_ADMIN)) 735 return -EACCES; 736 737 /* AUTH is only for authenticated or render client */ 738 if ((ioctl->flags & DRM_AUTH) && !drm_is_render_client(file_priv) && 739 !file_priv->authenticated) 740 return -EACCES; 741 742 /* MASTER is only for master or control clients */ 743 if ((ioctl->flags & DRM_MASTER) && !file_priv->is_master) 744 return -EACCES; 745 746 /* Render clients must be explicitly allowed */ 747 if (!(ioctl->flags & DRM_RENDER_ALLOW) && 748 drm_is_render_client(file_priv)) 749 return -EACCES; 750 751 if (ioctl->flags & DRM_UNLOCKED) 752 retcode = func(dev, data, file_priv); 753 else { 754 /* XXX lock */ 755 retcode = func(dev, data, file_priv); 756 /* XXX unlock */ 757 } 758 759 return (retcode); 760 } 761 762 /* drmioctl is called whenever a process performs an ioctl on /dev/drm. 763 */ 764 int 765 drmioctl(dev_t kdev, u_long cmd, caddr_t data, int flags, struct proc *p) 766 { 767 struct drm_device *dev = drm_get_device_from_kdev(kdev); 768 int error; 769 770 if (dev == NULL) 771 return ENODEV; 772 773 mtx_enter(&dev->quiesce_mtx); 774 while (dev->quiesce) 775 msleep_nsec(&dev->quiesce, &dev->quiesce_mtx, PZERO, "drmioc", 776 INFSLP); 777 dev->quiesce_count++; 778 mtx_leave(&dev->quiesce_mtx); 779 780 error = -drm_do_ioctl(dev, minor(kdev), cmd, data); 781 if (error < 0 && error != ERESTART && error != EJUSTRETURN) 782 printf("%s: cmd 0x%lx errno %d\n", __func__, cmd, error); 783 784 mtx_enter(&dev->quiesce_mtx); 785 dev->quiesce_count--; 786 if (dev->quiesce) 787 wakeup(&dev->quiesce_count); 788 mtx_leave(&dev->quiesce_mtx); 789 790 return (error); 791 } 792