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 <linux/export.h> 34 #include <linux/nospec.h> 35 #include <linux/pci.h> 36 #include <linux/uaccess.h> 37 38 #include <drm/drm_agpsupport.h> 39 #include <drm/drm_auth.h> 40 #include <drm/drm_crtc.h> 41 #include <drm/drm_drv.h> 42 #include <drm/drm_file.h> 43 #include <drm/drm_ioctl.h> 44 #include <drm/drm_print.h> 45 #include <drm/drm_pci.h> 46 47 #include "drm_crtc_internal.h" 48 #include "drm_internal.h" 49 #include "drm_legacy.h" 50 51 /** 52 * DOC: getunique and setversion story 53 * 54 * BEWARE THE DRAGONS! MIND THE TRAPDOORS! 55 * 56 * In an attempt to warn anyone else who's trying to figure out what's going 57 * on here, I'll try to summarize the story. First things first, let's clear up 58 * the names, because the kernel internals, libdrm and the ioctls are all named 59 * differently: 60 * 61 * - GET_UNIQUE ioctl, implemented by drm_getunique is wrapped up in libdrm 62 * through the drmGetBusid function. 63 * - The libdrm drmSetBusid function is backed by the SET_UNIQUE ioctl. All 64 * that code is nerved in the kernel with drm_invalid_op(). 65 * - The internal set_busid kernel functions and driver callbacks are 66 * exclusively use by the SET_VERSION ioctl, because only drm 1.0 (which is 67 * nerved) allowed userspace to set the busid through the above ioctl. 68 * - Other ioctls and functions involved are named consistently. 69 * 70 * For anyone wondering what's the difference between drm 1.1 and 1.4: Correctly 71 * handling pci domains in the busid on ppc. Doing this correctly was only 72 * implemented in libdrm in 2010, hence can't be nerved yet. No one knows what's 73 * special with drm 1.2 and 1.3. 74 * 75 * Now the actual horror story of how device lookup in drm works. At large, 76 * there's 2 different ways, either by busid, or by device driver name. 77 * 78 * Opening by busid is fairly simple: 79 * 80 * 1. First call SET_VERSION to make sure pci domains are handled properly. As a 81 * side-effect this fills out the unique name in the master structure. 82 * 2. Call GET_UNIQUE to read out the unique name from the master structure, 83 * which matches the busid thanks to step 1. If it doesn't, proceed to try 84 * the next device node. 85 * 86 * Opening by name is slightly different: 87 * 88 * 1. Directly call VERSION to get the version and to match against the driver 89 * name returned by that ioctl. Note that SET_VERSION is not called, which 90 * means the the unique name for the master node just opening is _not_ filled 91 * out. This despite that with current drm device nodes are always bound to 92 * one device, and can't be runtime assigned like with drm 1.0. 93 * 2. Match driver name. If it mismatches, proceed to the next device node. 94 * 3. Call GET_UNIQUE, and check whether the unique name has length zero (by 95 * checking that the first byte in the string is 0). If that's not the case 96 * libdrm skips and proceeds to the next device node. Probably this is just 97 * copypasta from drm 1.0 times where a set unique name meant that the driver 98 * was in use already, but that's just conjecture. 99 * 100 * Long story short: To keep the open by name logic working, GET_UNIQUE must 101 * _not_ return a unique string when SET_VERSION hasn't been called yet, 102 * otherwise libdrm breaks. Even when that unique string can't ever change, and 103 * is totally irrelevant for actually opening the device because runtime 104 * assignable device instances were only support in drm 1.0, which is long dead. 105 * But the libdrm code in drmOpenByName somehow survived, hence this can't be 106 * broken. 107 */ 108 109 /* 110 * Get the bus id. 111 * 112 * \param inode device inode. 113 * \param file_priv DRM file private. 114 * \param cmd command. 115 * \param arg user argument, pointing to a drm_unique structure. 116 * \return zero on success or a negative number on failure. 117 * 118 * Copies the bus id from drm_device::unique into user space. 119 */ 120 int drm_getunique(struct drm_device *dev, void *data, 121 struct drm_file *file_priv) 122 { 123 struct drm_unique *u = data; 124 struct drm_master *master = file_priv->master; 125 126 mutex_lock(&master->dev->master_mutex); 127 if (u->unique_len >= master->unique_len) { 128 if (copy_to_user(u->unique, master->unique, master->unique_len)) { 129 mutex_unlock(&master->dev->master_mutex); 130 return -EFAULT; 131 } 132 } 133 u->unique_len = master->unique_len; 134 mutex_unlock(&master->dev->master_mutex); 135 136 return 0; 137 } 138 139 static void 140 drm_unset_busid(struct drm_device *dev, 141 struct drm_master *master) 142 { 143 kfree(master->unique); 144 master->unique = NULL; 145 master->unique_len = 0; 146 } 147 148 static int drm_set_busid(struct drm_device *dev, struct drm_file *file_priv) 149 { 150 struct drm_master *master = file_priv->master; 151 int ret; 152 153 if (master->unique != NULL) 154 drm_unset_busid(dev, master); 155 156 #ifdef __linux__ 157 if (dev->dev && dev_is_pci(dev->dev)) { 158 #else 159 if (1) { 160 #endif 161 ret = drm_pci_set_busid(dev, master); 162 if (ret) { 163 drm_unset_busid(dev, master); 164 return ret; 165 } 166 } else { 167 WARN_ON(!dev->unique); 168 master->unique = kstrdup(dev->unique, GFP_KERNEL); 169 if (master->unique) 170 master->unique_len = strlen(dev->unique); 171 } 172 173 return 0; 174 } 175 176 /* 177 * Get client information. 178 * 179 * \param inode device inode. 180 * \param file_priv DRM file private. 181 * \param cmd command. 182 * \param arg user argument, pointing to a drm_client structure. 183 * 184 * \return zero on success or a negative number on failure. 185 * 186 * Searches for the client with the specified index and copies its information 187 * into userspace 188 */ 189 int drm_getclient(struct drm_device *dev, void *data, 190 struct drm_file *file_priv) 191 { 192 struct drm_client *client = data; 193 194 /* 195 * Hollowed-out getclient ioctl to keep some dead old drm tests/tools 196 * not breaking completely. Userspace tools stop enumerating one they 197 * get -EINVAL, hence this is the return value we need to hand back for 198 * no clients tracked. 199 * 200 * Unfortunately some clients (*cough* libva *cough*) use this in a fun 201 * attempt to figure out whether they're authenticated or not. Since 202 * that's the only thing they care about, give it to the directly 203 * instead of walking one giant list. 204 */ 205 if (client->idx == 0) { 206 client->auth = file_priv->authenticated; 207 #ifdef __linux__ 208 client->pid = task_pid_vnr(current); 209 client->uid = overflowuid; 210 #else 211 client->pid = curproc->p_p->ps_pid; 212 client->uid = 0xfffe; 213 #endif 214 client->magic = 0; 215 client->iocs = 0; 216 217 return 0; 218 } else { 219 return -EINVAL; 220 } 221 } 222 223 /* 224 * Get statistics information. 225 * 226 * \param inode device inode. 227 * \param file_priv DRM file private. 228 * \param cmd command. 229 * \param arg user argument, pointing to a drm_stats structure. 230 * 231 * \return zero on success or a negative number on failure. 232 */ 233 static int drm_getstats(struct drm_device *dev, void *data, 234 struct drm_file *file_priv) 235 { 236 struct drm_stats *stats = data; 237 238 /* Clear stats to prevent userspace from eating its stack garbage. */ 239 memset(stats, 0, sizeof(*stats)); 240 241 return 0; 242 } 243 244 /* 245 * Get device/driver capabilities 246 */ 247 static int drm_getcap(struct drm_device *dev, void *data, struct drm_file *file_priv) 248 { 249 struct drm_get_cap *req = data; 250 struct drm_crtc *crtc; 251 252 req->value = 0; 253 254 /* Only some caps make sense with UMS/render-only drivers. */ 255 switch (req->capability) { 256 case DRM_CAP_TIMESTAMP_MONOTONIC: 257 req->value = 1; 258 return 0; 259 case DRM_CAP_PRIME: 260 req->value |= dev->driver->prime_fd_to_handle ? DRM_PRIME_CAP_IMPORT : 0; 261 req->value |= dev->driver->prime_handle_to_fd ? DRM_PRIME_CAP_EXPORT : 0; 262 return 0; 263 case DRM_CAP_SYNCOBJ: 264 req->value = drm_core_check_feature(dev, DRIVER_SYNCOBJ); 265 return 0; 266 case DRM_CAP_SYNCOBJ_TIMELINE: 267 req->value = drm_core_check_feature(dev, DRIVER_SYNCOBJ_TIMELINE); 268 return 0; 269 } 270 271 /* Other caps only work with KMS drivers */ 272 if (!drm_core_check_feature(dev, DRIVER_MODESET)) 273 return -EOPNOTSUPP; 274 275 switch (req->capability) { 276 case DRM_CAP_DUMB_BUFFER: 277 if (dev->driver->dumb_create) 278 req->value = 1; 279 break; 280 case DRM_CAP_VBLANK_HIGH_CRTC: 281 req->value = 1; 282 break; 283 case DRM_CAP_DUMB_PREFERRED_DEPTH: 284 req->value = dev->mode_config.preferred_depth; 285 break; 286 case DRM_CAP_DUMB_PREFER_SHADOW: 287 req->value = dev->mode_config.prefer_shadow; 288 break; 289 case DRM_CAP_ASYNC_PAGE_FLIP: 290 req->value = dev->mode_config.async_page_flip; 291 break; 292 case DRM_CAP_PAGE_FLIP_TARGET: 293 req->value = 1; 294 drm_for_each_crtc(crtc, dev) { 295 if (!crtc->funcs->page_flip_target) 296 req->value = 0; 297 } 298 break; 299 case DRM_CAP_CURSOR_WIDTH: 300 if (dev->mode_config.cursor_width) 301 req->value = dev->mode_config.cursor_width; 302 else 303 req->value = 64; 304 break; 305 case DRM_CAP_CURSOR_HEIGHT: 306 if (dev->mode_config.cursor_height) 307 req->value = dev->mode_config.cursor_height; 308 else 309 req->value = 64; 310 break; 311 case DRM_CAP_ADDFB2_MODIFIERS: 312 req->value = dev->mode_config.allow_fb_modifiers; 313 break; 314 case DRM_CAP_CRTC_IN_VBLANK_EVENT: 315 req->value = 1; 316 break; 317 default: 318 return -EINVAL; 319 } 320 return 0; 321 } 322 323 /* 324 * Set device/driver capabilities 325 */ 326 static int 327 drm_setclientcap(struct drm_device *dev, void *data, struct drm_file *file_priv) 328 { 329 struct drm_set_client_cap *req = data; 330 331 /* No render-only settable capabilities for now */ 332 333 /* Below caps that only works with KMS drivers */ 334 if (!drm_core_check_feature(dev, DRIVER_MODESET)) 335 return -EOPNOTSUPP; 336 337 switch (req->capability) { 338 case DRM_CLIENT_CAP_STEREO_3D: 339 if (req->value > 1) 340 return -EINVAL; 341 file_priv->stereo_allowed = req->value; 342 break; 343 case DRM_CLIENT_CAP_UNIVERSAL_PLANES: 344 if (req->value > 1) 345 return -EINVAL; 346 file_priv->universal_planes = req->value; 347 break; 348 case DRM_CLIENT_CAP_ATOMIC: 349 if (!drm_core_check_feature(dev, DRIVER_ATOMIC)) 350 return -EOPNOTSUPP; 351 /* The modesetting DDX has a totally broken idea of atomic. */ 352 #ifdef __linux__ 353 if (current->comm[0] == 'X' && req->value == 1) { 354 #else 355 if (curproc->p_p->ps_comm[0] == 'X' && req->value == 1) { 356 #endif 357 pr_info("broken atomic modeset userspace detected, disabling atomic\n"); 358 return -EOPNOTSUPP; 359 } 360 if (req->value > 2) 361 return -EINVAL; 362 file_priv->atomic = req->value; 363 file_priv->universal_planes = req->value; 364 /* 365 * No atomic user-space blows up on aspect ratio mode bits. 366 */ 367 file_priv->aspect_ratio_allowed = req->value; 368 break; 369 case DRM_CLIENT_CAP_ASPECT_RATIO: 370 if (req->value > 1) 371 return -EINVAL; 372 file_priv->aspect_ratio_allowed = req->value; 373 break; 374 case DRM_CLIENT_CAP_WRITEBACK_CONNECTORS: 375 if (!file_priv->atomic) 376 return -EINVAL; 377 if (req->value > 1) 378 return -EINVAL; 379 file_priv->writeback_connectors = req->value; 380 break; 381 default: 382 return -EINVAL; 383 } 384 385 return 0; 386 } 387 388 /* 389 * Setversion ioctl. 390 * 391 * \param inode device inode. 392 * \param file_priv DRM file private. 393 * \param cmd command. 394 * \param arg user argument, pointing to a drm_lock structure. 395 * \return zero on success or negative number on failure. 396 * 397 * Sets the requested interface version 398 */ 399 static int drm_setversion(struct drm_device *dev, void *data, struct drm_file *file_priv) 400 { 401 struct drm_set_version *sv = data; 402 int if_version, retcode = 0; 403 404 mutex_lock(&dev->master_mutex); 405 if (sv->drm_di_major != -1) { 406 if (sv->drm_di_major != DRM_IF_MAJOR || 407 sv->drm_di_minor < 0 || sv->drm_di_minor > DRM_IF_MINOR) { 408 retcode = -EINVAL; 409 goto done; 410 } 411 if_version = DRM_IF_VERSION(sv->drm_di_major, 412 sv->drm_di_minor); 413 dev->if_version = max(if_version, dev->if_version); 414 if (sv->drm_di_minor >= 1) { 415 /* 416 * Version 1.1 includes tying of DRM to specific device 417 * Version 1.4 has proper PCI domain support 418 */ 419 retcode = drm_set_busid(dev, file_priv); 420 if (retcode) 421 goto done; 422 } 423 } 424 425 if (sv->drm_dd_major != -1) { 426 if (sv->drm_dd_major != dev->driver->major || 427 sv->drm_dd_minor < 0 || sv->drm_dd_minor > 428 dev->driver->minor) { 429 retcode = -EINVAL; 430 goto done; 431 } 432 } 433 434 done: 435 sv->drm_di_major = DRM_IF_MAJOR; 436 sv->drm_di_minor = DRM_IF_MINOR; 437 sv->drm_dd_major = dev->driver->major; 438 sv->drm_dd_minor = dev->driver->minor; 439 mutex_unlock(&dev->master_mutex); 440 441 return retcode; 442 } 443 444 /** 445 * drm_noop - DRM no-op ioctl implemntation 446 * @dev: DRM device for the ioctl 447 * @data: data pointer for the ioctl 448 * @file_priv: DRM file for the ioctl call 449 * 450 * This no-op implementation for drm ioctls is useful for deprecated 451 * functionality where we can't return a failure code because existing userspace 452 * checks the result of the ioctl, but doesn't care about the action. 453 * 454 * Always returns successfully with 0. 455 */ 456 int drm_noop(struct drm_device *dev, void *data, 457 struct drm_file *file_priv) 458 { 459 DRM_DEBUG("\n"); 460 return 0; 461 } 462 EXPORT_SYMBOL(drm_noop); 463 464 /** 465 * drm_invalid_op - DRM invalid ioctl implemntation 466 * @dev: DRM device for the ioctl 467 * @data: data pointer for the ioctl 468 * @file_priv: DRM file for the ioctl call 469 * 470 * This no-op implementation for drm ioctls is useful for deprecated 471 * functionality where we really don't want to allow userspace to call the ioctl 472 * any more. This is the case for old ums interfaces for drivers that 473 * transitioned to kms gradually and so kept the old legacy tables around. This 474 * only applies to radeon and i915 kms drivers, other drivers shouldn't need to 475 * use this function. 476 * 477 * Always fails with a return value of -EINVAL. 478 */ 479 int drm_invalid_op(struct drm_device *dev, void *data, 480 struct drm_file *file_priv) 481 { 482 return -EINVAL; 483 } 484 EXPORT_SYMBOL(drm_invalid_op); 485 486 /* 487 * Copy and IOCTL return string to user space 488 */ 489 static int drm_copy_field(char __user *buf, size_t *buf_len, const char *value) 490 { 491 int len; 492 493 /* don't overflow userbuf */ 494 len = strlen(value); 495 if (len > *buf_len) 496 len = *buf_len; 497 498 /* let userspace know exact length of driver value (which could be 499 * larger than the userspace-supplied buffer) */ 500 *buf_len = strlen(value); 501 502 /* finally, try filling in the userbuf */ 503 if (len && buf) 504 if (copy_to_user(buf, value, len)) 505 return -EFAULT; 506 return 0; 507 } 508 509 /* 510 * Get version information 511 * 512 * \param inode device inode. 513 * \param filp file pointer. 514 * \param cmd command. 515 * \param arg user argument, pointing to a drm_version structure. 516 * \return zero on success or negative number on failure. 517 * 518 * Fills in the version information in \p arg. 519 */ 520 int drm_version(struct drm_device *dev, void *data, 521 struct drm_file *file_priv) 522 { 523 struct drm_version *version = data; 524 int err; 525 526 version->version_major = dev->driver->major; 527 version->version_minor = dev->driver->minor; 528 version->version_patchlevel = dev->driver->patchlevel; 529 err = drm_copy_field(version->name, &version->name_len, 530 dev->driver->name); 531 if (!err) 532 err = drm_copy_field(version->date, &version->date_len, 533 dev->driver->date); 534 if (!err) 535 err = drm_copy_field(version->desc, &version->desc_len, 536 dev->driver->desc); 537 538 return err; 539 } 540 541 /** 542 * drm_ioctl_permit - Check ioctl permissions against caller 543 * 544 * @flags: ioctl permission flags. 545 * @file_priv: Pointer to struct drm_file identifying the caller. 546 * 547 * Checks whether the caller is allowed to run an ioctl with the 548 * indicated permissions. 549 * 550 * Returns: 551 * Zero if allowed, -EACCES otherwise. 552 */ 553 int drm_ioctl_permit(u32 flags, struct drm_file *file_priv) 554 { 555 /* ROOT_ONLY is only for CAP_SYS_ADMIN */ 556 if (unlikely((flags & DRM_ROOT_ONLY) && !capable(CAP_SYS_ADMIN))) 557 return -EACCES; 558 559 /* AUTH is only for authenticated or render client */ 560 if (unlikely((flags & DRM_AUTH) && !drm_is_render_client(file_priv) && 561 !file_priv->authenticated)) 562 return -EACCES; 563 564 /* MASTER is only for master or control clients */ 565 if (unlikely((flags & DRM_MASTER) && 566 !drm_is_current_master(file_priv))) 567 return -EACCES; 568 569 /* Render clients must be explicitly allowed */ 570 if (unlikely(!(flags & DRM_RENDER_ALLOW) && 571 drm_is_render_client(file_priv))) 572 return -EACCES; 573 574 return 0; 575 } 576 EXPORT_SYMBOL(drm_ioctl_permit); 577 578 #define DRM_IOCTL_DEF(ioctl, _func, _flags) \ 579 [DRM_IOCTL_NR(ioctl)] = { \ 580 .cmd = ioctl, \ 581 .func = _func, \ 582 .flags = _flags, \ 583 .name = #ioctl \ 584 } 585 586 #if IS_ENABLED(CONFIG_DRM_LEGACY) 587 #define DRM_LEGACY_IOCTL_DEF(ioctl, _func, _flags) DRM_IOCTL_DEF(ioctl, _func, _flags) 588 #else 589 #define DRM_LEGACY_IOCTL_DEF(ioctl, _func, _flags) DRM_IOCTL_DEF(ioctl, drm_invalid_op, _flags) 590 #endif 591 592 /* Ioctl table */ 593 static const struct drm_ioctl_desc drm_ioctls[] = { 594 DRM_IOCTL_DEF(DRM_IOCTL_VERSION, drm_version, DRM_RENDER_ALLOW), 595 DRM_IOCTL_DEF(DRM_IOCTL_GET_UNIQUE, drm_getunique, 0), 596 DRM_IOCTL_DEF(DRM_IOCTL_GET_MAGIC, drm_getmagic, 0), 597 #ifdef __linux__ 598 DRM_IOCTL_DEF(DRM_IOCTL_IRQ_BUSID, drm_irq_by_busid, DRM_MASTER|DRM_ROOT_ONLY), 599 #endif 600 601 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_GET_MAP, drm_legacy_getmap_ioctl, 0), 602 603 DRM_IOCTL_DEF(DRM_IOCTL_GET_CLIENT, drm_getclient, 0), 604 DRM_IOCTL_DEF(DRM_IOCTL_GET_STATS, drm_getstats, 0), 605 DRM_IOCTL_DEF(DRM_IOCTL_GET_CAP, drm_getcap, DRM_RENDER_ALLOW), 606 DRM_IOCTL_DEF(DRM_IOCTL_SET_CLIENT_CAP, drm_setclientcap, 0), 607 DRM_IOCTL_DEF(DRM_IOCTL_SET_VERSION, drm_setversion, DRM_MASTER), 608 609 DRM_IOCTL_DEF(DRM_IOCTL_SET_UNIQUE, drm_invalid_op, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 610 DRM_IOCTL_DEF(DRM_IOCTL_BLOCK, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 611 DRM_IOCTL_DEF(DRM_IOCTL_UNBLOCK, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 612 DRM_IOCTL_DEF(DRM_IOCTL_AUTH_MAGIC, drm_authmagic, DRM_MASTER), 613 614 #ifdef __linux__ 615 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_ADD_MAP, drm_legacy_addmap_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 616 #else 617 DRM_IOCTL_DEF(DRM_IOCTL_GET_PCIINFO, drm_getpciinfo, DRM_UNLOCKED|DRM_RENDER_ALLOW), 618 #endif 619 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_RM_MAP, drm_legacy_rmmap_ioctl, DRM_AUTH), 620 621 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_SET_SAREA_CTX, drm_legacy_setsareactx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 622 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_GET_SAREA_CTX, drm_legacy_getsareactx, DRM_AUTH), 623 624 #ifdef __linux__ 625 DRM_IOCTL_DEF(DRM_IOCTL_SET_MASTER, drm_setmaster_ioctl, DRM_ROOT_ONLY), 626 DRM_IOCTL_DEF(DRM_IOCTL_DROP_MASTER, drm_dropmaster_ioctl, DRM_ROOT_ONLY), 627 #else 628 /* On OpenBSD xorg privdrop has already occurred before this point */ 629 DRM_IOCTL_DEF(DRM_IOCTL_SET_MASTER, drm_noop, DRM_UNLOCKED), 630 DRM_IOCTL_DEF(DRM_IOCTL_DROP_MASTER, drm_noop, DRM_UNLOCKED), 631 #endif 632 633 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_ADD_CTX, drm_legacy_addctx, DRM_AUTH|DRM_ROOT_ONLY), 634 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_RM_CTX, drm_legacy_rmctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 635 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_MOD_CTX, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 636 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_GET_CTX, drm_legacy_getctx, DRM_AUTH), 637 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_SWITCH_CTX, drm_legacy_switchctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 638 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_NEW_CTX, drm_legacy_newctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 639 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_RES_CTX, drm_legacy_resctx, DRM_AUTH), 640 641 DRM_IOCTL_DEF(DRM_IOCTL_ADD_DRAW, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 642 DRM_IOCTL_DEF(DRM_IOCTL_RM_DRAW, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 643 644 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_LOCK, drm_legacy_lock, DRM_AUTH), 645 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_UNLOCK, drm_legacy_unlock, DRM_AUTH), 646 647 DRM_IOCTL_DEF(DRM_IOCTL_FINISH, drm_noop, DRM_AUTH), 648 649 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_ADD_BUFS, drm_legacy_addbufs, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 650 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_MARK_BUFS, drm_legacy_markbufs, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 651 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_INFO_BUFS, drm_legacy_infobufs, DRM_AUTH), 652 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_MAP_BUFS, drm_legacy_mapbufs, DRM_AUTH), 653 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_FREE_BUFS, drm_legacy_freebufs, DRM_AUTH), 654 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_DMA, drm_legacy_dma_ioctl, DRM_AUTH), 655 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_CONTROL, drm_legacy_irq_control, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 656 657 #if IS_ENABLED(CONFIG_AGP) && defined(__linux__) 658 DRM_IOCTL_DEF(DRM_IOCTL_AGP_ACQUIRE, drm_agp_acquire_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 659 DRM_IOCTL_DEF(DRM_IOCTL_AGP_RELEASE, drm_agp_release_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 660 DRM_IOCTL_DEF(DRM_IOCTL_AGP_ENABLE, drm_agp_enable_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 661 DRM_IOCTL_DEF(DRM_IOCTL_AGP_INFO, drm_agp_info_ioctl, DRM_AUTH), 662 DRM_IOCTL_DEF(DRM_IOCTL_AGP_ALLOC, drm_agp_alloc_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 663 DRM_IOCTL_DEF(DRM_IOCTL_AGP_FREE, drm_agp_free_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 664 DRM_IOCTL_DEF(DRM_IOCTL_AGP_BIND, drm_agp_bind_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 665 DRM_IOCTL_DEF(DRM_IOCTL_AGP_UNBIND, drm_agp_unbind_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 666 #endif 667 668 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_SG_ALLOC, drm_legacy_sg_alloc, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 669 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_SG_FREE, drm_legacy_sg_free, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 670 671 DRM_IOCTL_DEF(DRM_IOCTL_WAIT_VBLANK, drm_wait_vblank_ioctl, DRM_UNLOCKED), 672 673 DRM_IOCTL_DEF(DRM_IOCTL_MODESET_CTL, drm_legacy_modeset_ctl_ioctl, 0), 674 675 DRM_IOCTL_DEF(DRM_IOCTL_UPDATE_DRAW, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 676 677 DRM_IOCTL_DEF(DRM_IOCTL_GEM_CLOSE, drm_gem_close_ioctl, DRM_RENDER_ALLOW), 678 DRM_IOCTL_DEF(DRM_IOCTL_GEM_FLINK, drm_gem_flink_ioctl, DRM_AUTH), 679 DRM_IOCTL_DEF(DRM_IOCTL_GEM_OPEN, drm_gem_open_ioctl, DRM_AUTH), 680 681 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETRESOURCES, drm_mode_getresources, 0), 682 683 DRM_IOCTL_DEF(DRM_IOCTL_PRIME_HANDLE_TO_FD, drm_prime_handle_to_fd_ioctl, DRM_RENDER_ALLOW), 684 DRM_IOCTL_DEF(DRM_IOCTL_PRIME_FD_TO_HANDLE, drm_prime_fd_to_handle_ioctl, DRM_RENDER_ALLOW), 685 686 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPLANERESOURCES, drm_mode_getplane_res, 0), 687 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETCRTC, drm_mode_getcrtc, 0), 688 DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETCRTC, drm_mode_setcrtc, DRM_MASTER), 689 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPLANE, drm_mode_getplane, 0), 690 DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETPLANE, drm_mode_setplane, DRM_MASTER), 691 DRM_IOCTL_DEF(DRM_IOCTL_MODE_CURSOR, drm_mode_cursor_ioctl, DRM_MASTER), 692 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETGAMMA, drm_mode_gamma_get_ioctl, 0), 693 DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETGAMMA, drm_mode_gamma_set_ioctl, DRM_MASTER), 694 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETENCODER, drm_mode_getencoder, 0), 695 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETCONNECTOR, drm_mode_getconnector, 0), 696 DRM_IOCTL_DEF(DRM_IOCTL_MODE_ATTACHMODE, drm_noop, DRM_MASTER), 697 DRM_IOCTL_DEF(DRM_IOCTL_MODE_DETACHMODE, drm_noop, DRM_MASTER), 698 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPROPERTY, drm_mode_getproperty_ioctl, 0), 699 DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETPROPERTY, drm_connector_property_set_ioctl, DRM_MASTER), 700 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPROPBLOB, drm_mode_getblob_ioctl, 0), 701 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETFB, drm_mode_getfb, 0), 702 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETFB2, drm_mode_getfb2_ioctl, 0), 703 DRM_IOCTL_DEF(DRM_IOCTL_MODE_ADDFB, drm_mode_addfb_ioctl, 0), 704 DRM_IOCTL_DEF(DRM_IOCTL_MODE_ADDFB2, drm_mode_addfb2_ioctl, 0), 705 DRM_IOCTL_DEF(DRM_IOCTL_MODE_RMFB, drm_mode_rmfb_ioctl, 0), 706 DRM_IOCTL_DEF(DRM_IOCTL_MODE_PAGE_FLIP, drm_mode_page_flip_ioctl, DRM_MASTER), 707 DRM_IOCTL_DEF(DRM_IOCTL_MODE_DIRTYFB, drm_mode_dirtyfb_ioctl, DRM_MASTER), 708 DRM_IOCTL_DEF(DRM_IOCTL_MODE_CREATE_DUMB, drm_mode_create_dumb_ioctl, 0), 709 DRM_IOCTL_DEF(DRM_IOCTL_MODE_MAP_DUMB, drm_mode_mmap_dumb_ioctl, 0), 710 DRM_IOCTL_DEF(DRM_IOCTL_MODE_DESTROY_DUMB, drm_mode_destroy_dumb_ioctl, 0), 711 DRM_IOCTL_DEF(DRM_IOCTL_MODE_OBJ_GETPROPERTIES, drm_mode_obj_get_properties_ioctl, 0), 712 DRM_IOCTL_DEF(DRM_IOCTL_MODE_OBJ_SETPROPERTY, drm_mode_obj_set_property_ioctl, DRM_MASTER), 713 DRM_IOCTL_DEF(DRM_IOCTL_MODE_CURSOR2, drm_mode_cursor2_ioctl, DRM_MASTER), 714 DRM_IOCTL_DEF(DRM_IOCTL_MODE_ATOMIC, drm_mode_atomic_ioctl, DRM_MASTER), 715 DRM_IOCTL_DEF(DRM_IOCTL_MODE_CREATEPROPBLOB, drm_mode_createblob_ioctl, 0), 716 DRM_IOCTL_DEF(DRM_IOCTL_MODE_DESTROYPROPBLOB, drm_mode_destroyblob_ioctl, 0), 717 718 DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_CREATE, drm_syncobj_create_ioctl, 719 DRM_RENDER_ALLOW), 720 DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_DESTROY, drm_syncobj_destroy_ioctl, 721 DRM_RENDER_ALLOW), 722 DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_HANDLE_TO_FD, drm_syncobj_handle_to_fd_ioctl, 723 DRM_RENDER_ALLOW), 724 DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_FD_TO_HANDLE, drm_syncobj_fd_to_handle_ioctl, 725 DRM_RENDER_ALLOW), 726 DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_TRANSFER, drm_syncobj_transfer_ioctl, 727 DRM_RENDER_ALLOW), 728 DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_WAIT, drm_syncobj_wait_ioctl, 729 DRM_RENDER_ALLOW), 730 DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_TIMELINE_WAIT, drm_syncobj_timeline_wait_ioctl, 731 DRM_RENDER_ALLOW), 732 DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_RESET, drm_syncobj_reset_ioctl, 733 DRM_RENDER_ALLOW), 734 DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_SIGNAL, drm_syncobj_signal_ioctl, 735 DRM_RENDER_ALLOW), 736 DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_TIMELINE_SIGNAL, drm_syncobj_timeline_signal_ioctl, 737 DRM_RENDER_ALLOW), 738 DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_QUERY, drm_syncobj_query_ioctl, 739 DRM_RENDER_ALLOW), 740 DRM_IOCTL_DEF(DRM_IOCTL_CRTC_GET_SEQUENCE, drm_crtc_get_sequence_ioctl, 0), 741 DRM_IOCTL_DEF(DRM_IOCTL_CRTC_QUEUE_SEQUENCE, drm_crtc_queue_sequence_ioctl, 0), 742 #ifdef __linux__ 743 DRM_IOCTL_DEF(DRM_IOCTL_MODE_CREATE_LEASE, drm_mode_create_lease_ioctl, DRM_MASTER), 744 DRM_IOCTL_DEF(DRM_IOCTL_MODE_LIST_LESSEES, drm_mode_list_lessees_ioctl, DRM_MASTER), 745 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GET_LEASE, drm_mode_get_lease_ioctl, DRM_MASTER), 746 DRM_IOCTL_DEF(DRM_IOCTL_MODE_REVOKE_LEASE, drm_mode_revoke_lease_ioctl, DRM_MASTER), 747 #endif 748 }; 749 750 #define DRM_CORE_IOCTL_COUNT ARRAY_SIZE( drm_ioctls ) 751 752 int 753 pledge_ioctl_drm(struct proc *p, long com, dev_t device) 754 { 755 struct drm_device *dev = drm_get_device_from_kdev(device); 756 unsigned int nr = DRM_IOCTL_NR(com); 757 const struct drm_ioctl_desc *ioctl; 758 759 if (dev == NULL) 760 return EPERM; 761 762 if (nr < DRM_CORE_IOCTL_COUNT && 763 ((nr < DRM_COMMAND_BASE || nr >= DRM_COMMAND_END))) 764 ioctl = &drm_ioctls[nr]; 765 else if (nr >= DRM_COMMAND_BASE && nr < DRM_COMMAND_END && 766 nr < DRM_COMMAND_BASE + dev->driver->num_ioctls) 767 ioctl = &dev->driver->ioctls[nr - DRM_COMMAND_BASE]; 768 else 769 return EPERM; 770 771 if (ioctl->flags & DRM_RENDER_ALLOW) 772 return 0; 773 774 /* 775 * These are dangerous, but we have to allow them until we 776 * have prime/dma-buf support. 777 */ 778 switch (com) { 779 case DRM_IOCTL_GET_MAGIC: 780 case DRM_IOCTL_GEM_OPEN: 781 return 0; 782 } 783 784 /* for amdgpu libdrm */ 785 if (com == DRM_IOCTL_GET_CLIENT) 786 return 0; 787 788 return EPERM; 789 } 790 791 /** 792 * DOC: driver specific ioctls 793 * 794 * First things first, driver private IOCTLs should only be needed for drivers 795 * supporting rendering. Kernel modesetting is all standardized, and extended 796 * through properties. There are a few exceptions in some existing drivers, 797 * which define IOCTL for use by the display DRM master, but they all predate 798 * properties. 799 * 800 * Now if you do have a render driver you always have to support it through 801 * driver private properties. There's a few steps needed to wire all the things 802 * up. 803 * 804 * First you need to define the structure for your IOCTL in your driver private 805 * UAPI header in ``include/uapi/drm/my_driver_drm.h``:: 806 * 807 * struct my_driver_operation { 808 * u32 some_thing; 809 * u32 another_thing; 810 * }; 811 * 812 * Please make sure that you follow all the best practices from 813 * ``Documentation/ioctl/botching-up-ioctls.rst``. Note that drm_ioctl() 814 * automatically zero-extends structures, hence make sure you can add more stuff 815 * at the end, i.e. don't put a variable sized array there. 816 * 817 * Then you need to define your IOCTL number, using one of DRM_IO(), DRM_IOR(), 818 * DRM_IOW() or DRM_IOWR(). It must start with the DRM_IOCTL\_ prefix:: 819 * 820 * ##define DRM_IOCTL_MY_DRIVER_OPERATION \ 821 * DRM_IOW(DRM_COMMAND_BASE, struct my_driver_operation) 822 * 823 * DRM driver private IOCTL must be in the range from DRM_COMMAND_BASE to 824 * DRM_COMMAND_END. Finally you need an array of &struct drm_ioctl_desc to wire 825 * up the handlers and set the access rights:: 826 * 827 * static const struct drm_ioctl_desc my_driver_ioctls[] = { 828 * DRM_IOCTL_DEF_DRV(MY_DRIVER_OPERATION, my_driver_operation, 829 * DRM_AUTH|DRM_RENDER_ALLOW), 830 * }; 831 * 832 * And then assign this to the &drm_driver.ioctls field in your driver 833 * structure. 834 * 835 * See the separate chapter on :ref:`file operations<drm_driver_fops>` for how 836 * the driver-specific IOCTLs are wired up. 837 */ 838 839 long drm_ioctl_kernel(struct file *file, drm_ioctl_t *func, void *kdata, 840 u32 flags) 841 { 842 STUB(); 843 return -ENOSYS; 844 #ifdef notyet 845 struct drm_file *file_priv = file->private_data; 846 struct drm_device *dev = file_priv->minor->dev; 847 int retcode; 848 849 if (drm_dev_is_unplugged(dev)) 850 return -ENODEV; 851 852 retcode = drm_ioctl_permit(flags, file_priv); 853 if (unlikely(retcode)) 854 return retcode; 855 856 /* Enforce sane locking for modern driver ioctls. */ 857 if (likely(!drm_core_check_feature(dev, DRIVER_LEGACY)) || 858 (flags & DRM_UNLOCKED)) 859 retcode = func(dev, kdata, file_priv); 860 else { 861 mutex_lock(&drm_global_mutex); 862 retcode = func(dev, kdata, file_priv); 863 mutex_unlock(&drm_global_mutex); 864 } 865 return retcode; 866 #endif 867 } 868 EXPORT_SYMBOL(drm_ioctl_kernel); 869 870 /** 871 * drm_ioctl - ioctl callback implementation for DRM drivers 872 * @filp: file this ioctl is called on 873 * @cmd: ioctl cmd number 874 * @arg: user argument 875 * 876 * Looks up the ioctl function in the DRM core and the driver dispatch table, 877 * stored in &drm_driver.ioctls. It checks for necessary permission by calling 878 * drm_ioctl_permit(), and dispatches to the respective function. 879 * 880 * Returns: 881 * Zero on success, negative error code on failure. 882 */ 883 long drm_ioctl(struct file *filp, 884 unsigned int cmd, unsigned long arg) 885 { 886 STUB(); 887 return -ENOSYS; 888 #ifdef notyet 889 struct drm_file *file_priv = filp->private_data; 890 struct drm_device *dev; 891 const struct drm_ioctl_desc *ioctl = NULL; 892 drm_ioctl_t *func; 893 unsigned int nr = DRM_IOCTL_NR(cmd); 894 int retcode = -EINVAL; 895 char stack_kdata[128]; 896 char *kdata = NULL; 897 unsigned int in_size, out_size, drv_size, ksize; 898 bool is_driver_ioctl; 899 900 dev = file_priv->minor->dev; 901 902 if (drm_dev_is_unplugged(dev)) 903 return -ENODEV; 904 905 is_driver_ioctl = nr >= DRM_COMMAND_BASE && nr < DRM_COMMAND_END; 906 907 if (is_driver_ioctl) { 908 /* driver ioctl */ 909 unsigned int index = nr - DRM_COMMAND_BASE; 910 911 if (index >= dev->driver->num_ioctls) 912 goto err_i1; 913 index = array_index_nospec(index, dev->driver->num_ioctls); 914 ioctl = &dev->driver->ioctls[index]; 915 } else { 916 /* core ioctl */ 917 if (nr >= DRM_CORE_IOCTL_COUNT) 918 goto err_i1; 919 nr = array_index_nospec(nr, DRM_CORE_IOCTL_COUNT); 920 ioctl = &drm_ioctls[nr]; 921 } 922 923 drv_size = _IOC_SIZE(ioctl->cmd); 924 out_size = in_size = _IOC_SIZE(cmd); 925 if ((cmd & ioctl->cmd & IOC_IN) == 0) 926 in_size = 0; 927 if ((cmd & ioctl->cmd & IOC_OUT) == 0) 928 out_size = 0; 929 ksize = max(max(in_size, out_size), drv_size); 930 931 DRM_DEBUG("pid=%d, dev=0x%lx, auth=%d, %s\n", 932 task_pid_nr(current), 933 (long)old_encode_dev(file_priv->minor->kdev->devt), 934 file_priv->authenticated, ioctl->name); 935 936 /* Do not trust userspace, use our own definition */ 937 func = ioctl->func; 938 939 if (unlikely(!func)) { 940 DRM_DEBUG("no function\n"); 941 retcode = -EINVAL; 942 goto err_i1; 943 } 944 945 if (ksize <= sizeof(stack_kdata)) { 946 kdata = stack_kdata; 947 } else { 948 kdata = kmalloc(ksize, GFP_KERNEL); 949 if (!kdata) { 950 retcode = -ENOMEM; 951 goto err_i1; 952 } 953 } 954 955 if (copy_from_user(kdata, (void __user *)arg, in_size) != 0) { 956 retcode = -EFAULT; 957 goto err_i1; 958 } 959 960 if (ksize > in_size) 961 memset(kdata + in_size, 0, ksize - in_size); 962 963 retcode = drm_ioctl_kernel(filp, func, kdata, ioctl->flags); 964 if (copy_to_user((void __user *)arg, kdata, out_size) != 0) 965 retcode = -EFAULT; 966 967 err_i1: 968 if (!ioctl) 969 DRM_DEBUG("invalid ioctl: pid=%d, dev=0x%lx, auth=%d, cmd=0x%02x, nr=0x%02x\n", 970 task_pid_nr(current), 971 (long)old_encode_dev(file_priv->minor->kdev->devt), 972 file_priv->authenticated, cmd, nr); 973 974 if (kdata != stack_kdata) 975 kfree(kdata); 976 if (retcode) 977 DRM_DEBUG("pid=%d, ret = %d\n", task_pid_nr(current), retcode); 978 return retcode; 979 #endif 980 } 981 EXPORT_SYMBOL(drm_ioctl); 982 983 /** 984 * drm_ioctl_flags - Check for core ioctl and return ioctl permission flags 985 * @nr: ioctl number 986 * @flags: where to return the ioctl permission flags 987 * 988 * This ioctl is only used by the vmwgfx driver to augment the access checks 989 * done by the drm core and insofar a pretty decent layering violation. This 990 * shouldn't be used by any drivers. 991 * 992 * Returns: 993 * True if the @nr corresponds to a DRM core ioctl number, false otherwise. 994 */ 995 bool drm_ioctl_flags(unsigned int nr, unsigned int *flags) 996 { 997 if (nr >= DRM_COMMAND_BASE && nr < DRM_COMMAND_END) 998 return false; 999 1000 if (nr >= DRM_CORE_IOCTL_COUNT) 1001 return false; 1002 nr = array_index_nospec(nr, DRM_CORE_IOCTL_COUNT); 1003 1004 *flags = drm_ioctls[nr].flags; 1005 return true; 1006 } 1007 EXPORT_SYMBOL(drm_ioctl_flags); 1008 1009 int 1010 drm_do_ioctl(struct drm_device *dev, int minor, u_long cmd, caddr_t data) 1011 { 1012 struct drm_file *file_priv; 1013 const struct drm_ioctl_desc *ioctl; 1014 drm_ioctl_t *func; 1015 unsigned int nr = DRM_IOCTL_NR(cmd); 1016 int retcode = -EINVAL; 1017 unsigned int usize, asize; 1018 caddr_t adata = data; 1019 1020 mutex_lock(&dev->filelist_mutex); 1021 file_priv = drm_find_file_by_minor(dev, minor); 1022 mutex_unlock(&dev->filelist_mutex); 1023 if (file_priv == NULL) { 1024 DRM_ERROR("can't find authenticator\n"); 1025 return -EINVAL; 1026 } 1027 1028 DRM_DEBUG("pid=%d, cmd=0x%02lx, nr=0x%02x, dev 0x%lx, auth=%d\n", 1029 curproc->p_p->ps_pid, cmd, (u_int)DRM_IOCTL_NR(cmd), (long)&dev->dev, 1030 file_priv->authenticated); 1031 1032 switch (cmd) { 1033 case FIONBIO: 1034 case FIOASYNC: 1035 return 0; 1036 } 1037 1038 if ((nr >= DRM_CORE_IOCTL_COUNT) && 1039 ((nr < DRM_COMMAND_BASE) || (nr >= DRM_COMMAND_END))) 1040 return (-EINVAL); 1041 if ((nr >= DRM_COMMAND_BASE) && (nr < DRM_COMMAND_END) && 1042 (nr < DRM_COMMAND_BASE + dev->driver->num_ioctls)) { 1043 uint32_t drv_size; 1044 ioctl = &dev->driver->ioctls[nr - DRM_COMMAND_BASE]; 1045 drv_size = IOCPARM_LEN(ioctl->cmd); 1046 usize = asize = IOCPARM_LEN(cmd); 1047 if (drv_size > asize) 1048 asize = drv_size; 1049 } else if ((nr >= DRM_COMMAND_END) || (nr < DRM_COMMAND_BASE)) { 1050 uint32_t drv_size; 1051 ioctl = &drm_ioctls[nr]; 1052 1053 drv_size = IOCPARM_LEN(ioctl->cmd); 1054 usize = asize = IOCPARM_LEN(cmd); 1055 if (drv_size > asize) 1056 asize = drv_size; 1057 cmd = ioctl->cmd; 1058 } else 1059 return (-EINVAL); 1060 1061 func = ioctl->func; 1062 if (!func) { 1063 DRM_DEBUG("no function\n"); 1064 return (-EINVAL); 1065 } 1066 1067 retcode = drm_ioctl_permit(ioctl->flags, file_priv); 1068 if (unlikely(retcode)) 1069 return retcode; 1070 1071 if (asize > usize) { 1072 adata = malloc(asize, M_DRM, M_WAITOK | M_ZERO); 1073 memcpy(adata, data, usize); 1074 } 1075 1076 if (ioctl->flags & DRM_UNLOCKED) 1077 retcode = func(dev, adata, file_priv); 1078 else { 1079 mutex_lock(&drm_global_mutex); 1080 retcode = func(dev, adata, file_priv); 1081 mutex_unlock(&drm_global_mutex); 1082 } 1083 1084 if (asize > usize) { 1085 memcpy(data, adata, usize); 1086 free(adata, M_DRM, asize); 1087 } 1088 1089 return (retcode); 1090 } 1091 1092 /* drmioctl is called whenever a process performs an ioctl on /dev/drm. 1093 */ 1094 int 1095 drmioctl(dev_t kdev, u_long cmd, caddr_t data, int flags, struct proc *p) 1096 { 1097 struct drm_device *dev = drm_get_device_from_kdev(kdev); 1098 int error; 1099 1100 if (dev == NULL) 1101 return ENODEV; 1102 1103 mtx_enter(&dev->quiesce_mtx); 1104 while (dev->quiesce) 1105 msleep_nsec(&dev->quiesce, &dev->quiesce_mtx, PZERO, "drmioc", 1106 INFSLP); 1107 dev->quiesce_count++; 1108 mtx_leave(&dev->quiesce_mtx); 1109 1110 error = -drm_do_ioctl(dev, minor(kdev), cmd, data); 1111 if (error < 0 && error != ERESTART && error != EJUSTRETURN) 1112 printf("%s: cmd 0x%lx errno %d\n", __func__, cmd, error); 1113 1114 mtx_enter(&dev->quiesce_mtx); 1115 dev->quiesce_count--; 1116 if (dev->quiesce) 1117 wakeup(&dev->quiesce_count); 1118 mtx_leave(&dev->quiesce_mtx); 1119 1120 return (error); 1121 } 1122