drm_ioctl.c revision 1.18
1 /* $NetBSD: drm_ioctl.c,v 1.18 2021/12/19 09:48:53 riastradh Exp $ */ 2 3 /* 4 * Created: Fri Jan 8 09:01:26 1999 by faith (at) valinux.com 5 * 6 * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas. 7 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California. 8 * All Rights Reserved. 9 * 10 * Author Rickard E. (Rik) Faith <faith (at) valinux.com> 11 * Author Gareth Hughes <gareth (at) valinux.com> 12 * 13 * Permission is hereby granted, free of charge, to any person obtaining a 14 * copy of this software and associated documentation files (the "Software"), 15 * to deal in the Software without restriction, including without limitation 16 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 17 * and/or sell copies of the Software, and to permit persons to whom the 18 * Software is furnished to do so, subject to the following conditions: 19 * 20 * The above copyright notice and this permission notice (including the next 21 * paragraph) shall be included in all copies or substantial portions of the 22 * Software. 23 * 24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 25 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 26 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 27 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR 28 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 29 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR 30 * OTHER DEALINGS IN THE SOFTWARE. 31 */ 32 33 #include <sys/cdefs.h> 34 __KERNEL_RCSID(0, "$NetBSD: drm_ioctl.c,v 1.18 2021/12/19 09:48:53 riastradh Exp $"); 35 36 #include <linux/export.h> 37 #include <linux/nospec.h> 38 #include <linux/pci.h> 39 #include <linux/uaccess.h> 40 #include <linux/capability.h> 41 42 #ifdef __NetBSD__ 43 #include <sys/types.h> 44 #include <sys/file.h> 45 #endif 46 47 #include <drm/drm_agpsupport.h> 48 #include <drm/drm_auth.h> 49 #include <drm/drm_crtc.h> 50 #include <drm/drm_drv.h> 51 #include <drm/drm_file.h> 52 #include <drm/drm_ioctl.h> 53 #include <drm/drm_print.h> 54 55 #include "drm_crtc_internal.h" 56 #include "drm_internal.h" 57 #include "drm_legacy.h" 58 59 /** 60 * DOC: getunique and setversion story 61 * 62 * BEWARE THE DRAGONS! MIND THE TRAPDOORS! 63 * 64 * In an attempt to warn anyone else who's trying to figure out what's going 65 * on here, I'll try to summarize the story. First things first, let's clear up 66 * the names, because the kernel internals, libdrm and the ioctls are all named 67 * differently: 68 * 69 * - GET_UNIQUE ioctl, implemented by drm_getunique is wrapped up in libdrm 70 * through the drmGetBusid function. 71 * - The libdrm drmSetBusid function is backed by the SET_UNIQUE ioctl. All 72 * that code is nerved in the kernel with drm_invalid_op(). 73 * - The internal set_busid kernel functions and driver callbacks are 74 * exclusively use by the SET_VERSION ioctl, because only drm 1.0 (which is 75 * nerved) allowed userspace to set the busid through the above ioctl. 76 * - Other ioctls and functions involved are named consistently. 77 * 78 * For anyone wondering what's the difference between drm 1.1 and 1.4: Correctly 79 * handling pci domains in the busid on ppc. Doing this correctly was only 80 * implemented in libdrm in 2010, hence can't be nerved yet. No one knows what's 81 * special with drm 1.2 and 1.3. 82 * 83 * Now the actual horror story of how device lookup in drm works. At large, 84 * there's 2 different ways, either by busid, or by device driver name. 85 * 86 * Opening by busid is fairly simple: 87 * 88 * 1. First call SET_VERSION to make sure pci domains are handled properly. As a 89 * side-effect this fills out the unique name in the master structure. 90 * 2. Call GET_UNIQUE to read out the unique name from the master structure, 91 * which matches the busid thanks to step 1. If it doesn't, proceed to try 92 * the next device node. 93 * 94 * Opening by name is slightly different: 95 * 96 * 1. Directly call VERSION to get the version and to match against the driver 97 * name returned by that ioctl. Note that SET_VERSION is not called, which 98 * means the the unique name for the master node just opening is _not_ filled 99 * out. This despite that with current drm device nodes are always bound to 100 * one device, and can't be runtime assigned like with drm 1.0. 101 * 2. Match driver name. If it mismatches, proceed to the next device node. 102 * 3. Call GET_UNIQUE, and check whether the unique name has length zero (by 103 * checking that the first byte in the string is 0). If that's not the case 104 * libdrm skips and proceeds to the next device node. Probably this is just 105 * copypasta from drm 1.0 times where a set unique name meant that the driver 106 * was in use already, but that's just conjecture. 107 * 108 * Long story short: To keep the open by name logic working, GET_UNIQUE must 109 * _not_ return a unique string when SET_VERSION hasn't been called yet, 110 * otherwise libdrm breaks. Even when that unique string can't ever change, and 111 * is totally irrelevant for actually opening the device because runtime 112 * assignable device instances were only support in drm 1.0, which is long dead. 113 * But the libdrm code in drmOpenByName somehow survived, hence this can't be 114 * broken. 115 */ 116 117 /* 118 * Get the bus id. 119 * 120 * \param inode device inode. 121 * \param file_priv DRM file private. 122 * \param cmd command. 123 * \param arg user argument, pointing to a drm_unique structure. 124 * \return zero on success or a negative number on failure. 125 * 126 * Copies the bus id from drm_device::unique into user space. 127 */ 128 int drm_getunique(struct drm_device *dev, void *data, 129 struct drm_file *file_priv) 130 { 131 struct drm_unique *u = data; 132 struct drm_master *master = file_priv->master; 133 134 mutex_lock(&master->dev->master_mutex); 135 if (u->unique_len >= master->unique_len) { 136 if (copy_to_user(u->unique, master->unique, master->unique_len)) { 137 mutex_unlock(&master->dev->master_mutex); 138 return -EFAULT; 139 } 140 } 141 u->unique_len = master->unique_len; 142 mutex_unlock(&master->dev->master_mutex); 143 144 return 0; 145 } 146 147 static void 148 drm_unset_busid(struct drm_device *dev, 149 struct drm_master *master) 150 { 151 kfree(master->unique); 152 master->unique = NULL; 153 master->unique_len = 0; 154 } 155 156 static int drm_set_busid(struct drm_device *dev, struct drm_file *file_priv) 157 { 158 struct drm_master *master = file_priv->master; 159 int ret; 160 161 if (master->unique != NULL) 162 drm_unset_busid(dev, master); 163 164 if (dev->dev && dev_is_pci(dev->pdev)) { 165 ret = drm_pci_set_busid(dev, master); 166 if (ret) { 167 drm_unset_busid(dev, master); 168 return ret; 169 } 170 } else { 171 WARN_ON(!dev->unique); 172 master->unique = kstrdup(dev->unique, GFP_KERNEL); 173 if (master->unique) 174 master->unique_len = strlen(dev->unique); 175 } 176 177 return 0; 178 } 179 180 /* 181 * Get client information. 182 * 183 * \param inode device inode. 184 * \param file_priv DRM file private. 185 * \param cmd command. 186 * \param arg user argument, pointing to a drm_client structure. 187 * 188 * \return zero on success or a negative number on failure. 189 * 190 * Searches for the client with the specified index and copies its information 191 * into userspace 192 */ 193 int drm_getclient(struct drm_device *dev, void *data, 194 struct drm_file *file_priv) 195 { 196 struct drm_client *client = data; 197 198 /* 199 * Hollowed-out getclient ioctl to keep some dead old drm tests/tools 200 * not breaking completely. Userspace tools stop enumerating one they 201 * get -EINVAL, hence this is the return value we need to hand back for 202 * no clients tracked. 203 * 204 * Unfortunately some clients (*cough* libva *cough*) use this in a fun 205 * attempt to figure out whether they're authenticated or not. Since 206 * that's the only thing they care about, give it to the directly 207 * instead of walking one giant list. 208 */ 209 if (client->idx == 0) { 210 client->auth = file_priv->authenticated; 211 #ifdef __NetBSD__ /* XXX Too scary to contemplate. */ 212 client->pid = curproc->p_pid; 213 client->uid = kauth_cred_geteuid(curproc->p_cred); 214 #else 215 client->pid = task_pid_vnr(current); 216 client->uid = overflowuid; 217 #endif 218 client->magic = 0; 219 client->iocs = 0; 220 221 return 0; 222 } else { 223 return -EINVAL; 224 } 225 } 226 227 /* 228 * Get statistics information. 229 * 230 * \param inode device inode. 231 * \param file_priv DRM file private. 232 * \param cmd command. 233 * \param arg user argument, pointing to a drm_stats structure. 234 * 235 * \return zero on success or a negative number on failure. 236 */ 237 static int drm_getstats(struct drm_device *dev, void *data, 238 struct drm_file *file_priv) 239 { 240 struct drm_stats *stats = data; 241 242 /* Clear stats to prevent userspace from eating its stack garbage. */ 243 memset(stats, 0, sizeof(*stats)); 244 245 return 0; 246 } 247 248 /* 249 * Get device/driver capabilities 250 */ 251 static int drm_getcap(struct drm_device *dev, void *data, struct drm_file *file_priv) 252 { 253 struct drm_get_cap *req = data; 254 struct drm_crtc *crtc; 255 256 req->value = 0; 257 258 /* Only some caps make sense with UMS/render-only drivers. */ 259 switch (req->capability) { 260 case DRM_CAP_TIMESTAMP_MONOTONIC: 261 req->value = 1; 262 return 0; 263 case DRM_CAP_PRIME: 264 req->value |= dev->driver->prime_fd_to_handle ? DRM_PRIME_CAP_IMPORT : 0; 265 req->value |= dev->driver->prime_handle_to_fd ? DRM_PRIME_CAP_EXPORT : 0; 266 return 0; 267 case DRM_CAP_SYNCOBJ: 268 req->value = drm_core_check_feature(dev, DRIVER_SYNCOBJ); 269 return 0; 270 case DRM_CAP_SYNCOBJ_TIMELINE: 271 req->value = drm_core_check_feature(dev, DRIVER_SYNCOBJ_TIMELINE); 272 return 0; 273 } 274 275 /* Other caps only work with KMS drivers */ 276 if (!drm_core_check_feature(dev, DRIVER_MODESET)) 277 return -EOPNOTSUPP; 278 279 switch (req->capability) { 280 case DRM_CAP_DUMB_BUFFER: 281 if (dev->driver->dumb_create) 282 req->value = 1; 283 break; 284 case DRM_CAP_VBLANK_HIGH_CRTC: 285 req->value = 1; 286 break; 287 case DRM_CAP_DUMB_PREFERRED_DEPTH: 288 req->value = dev->mode_config.preferred_depth; 289 break; 290 case DRM_CAP_DUMB_PREFER_SHADOW: 291 req->value = dev->mode_config.prefer_shadow; 292 break; 293 case DRM_CAP_ASYNC_PAGE_FLIP: 294 req->value = dev->mode_config.async_page_flip; 295 break; 296 case DRM_CAP_PAGE_FLIP_TARGET: 297 req->value = 1; 298 drm_for_each_crtc(crtc, dev) { 299 if (!crtc->funcs->page_flip_target) 300 req->value = 0; 301 } 302 break; 303 case DRM_CAP_CURSOR_WIDTH: 304 if (dev->mode_config.cursor_width) 305 req->value = dev->mode_config.cursor_width; 306 else 307 req->value = 64; 308 break; 309 case DRM_CAP_CURSOR_HEIGHT: 310 if (dev->mode_config.cursor_height) 311 req->value = dev->mode_config.cursor_height; 312 else 313 req->value = 64; 314 break; 315 case DRM_CAP_ADDFB2_MODIFIERS: 316 req->value = dev->mode_config.allow_fb_modifiers; 317 break; 318 case DRM_CAP_CRTC_IN_VBLANK_EVENT: 319 req->value = 1; 320 break; 321 default: 322 return -EINVAL; 323 } 324 return 0; 325 } 326 327 /* 328 * Set device/driver capabilities 329 */ 330 static int 331 drm_setclientcap(struct drm_device *dev, void *data, struct drm_file *file_priv) 332 { 333 struct drm_set_client_cap *req = data; 334 335 /* No render-only settable capabilities for now */ 336 337 /* Below caps that only works with KMS drivers */ 338 if (!drm_core_check_feature(dev, DRIVER_MODESET)) 339 return -EOPNOTSUPP; 340 341 switch (req->capability) { 342 case DRM_CLIENT_CAP_STEREO_3D: 343 if (req->value > 1) 344 return -EINVAL; 345 file_priv->stereo_allowed = req->value; 346 break; 347 case DRM_CLIENT_CAP_UNIVERSAL_PLANES: 348 if (req->value > 1) 349 return -EINVAL; 350 file_priv->universal_planes = req->value; 351 break; 352 case DRM_CLIENT_CAP_ATOMIC: 353 if (!drm_core_check_feature(dev, DRIVER_ATOMIC)) 354 return -EOPNOTSUPP; 355 /* The modesetting DDX has a totally broken idea of atomic. */ 356 if (current->comm[0] == 'X' && req->value == 1) { 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 DRM_IOCTL_DEF(DRM_IOCTL_IRQ_BUSID, drm_irq_by_busid, DRM_MASTER|DRM_ROOT_ONLY), 598 599 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_GET_MAP, drm_legacy_getmap_ioctl, 0), 600 601 DRM_IOCTL_DEF(DRM_IOCTL_GET_CLIENT, drm_getclient, 0), 602 DRM_IOCTL_DEF(DRM_IOCTL_GET_STATS, drm_getstats, 0), 603 DRM_IOCTL_DEF(DRM_IOCTL_GET_CAP, drm_getcap, DRM_RENDER_ALLOW), 604 DRM_IOCTL_DEF(DRM_IOCTL_SET_CLIENT_CAP, drm_setclientcap, 0), 605 DRM_IOCTL_DEF(DRM_IOCTL_SET_VERSION, drm_setversion, DRM_MASTER), 606 607 DRM_IOCTL_DEF(DRM_IOCTL_SET_UNIQUE, drm_invalid_op, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 608 DRM_IOCTL_DEF(DRM_IOCTL_BLOCK, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 609 DRM_IOCTL_DEF(DRM_IOCTL_UNBLOCK, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 610 DRM_IOCTL_DEF(DRM_IOCTL_AUTH_MAGIC, drm_authmagic, DRM_MASTER), 611 612 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_ADD_MAP, drm_legacy_addmap_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 613 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_RM_MAP, drm_legacy_rmmap_ioctl, DRM_AUTH), 614 615 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_SET_SAREA_CTX, drm_legacy_setsareactx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 616 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_GET_SAREA_CTX, drm_legacy_getsareactx, DRM_AUTH), 617 618 DRM_IOCTL_DEF(DRM_IOCTL_SET_MASTER, drm_setmaster_ioctl, DRM_ROOT_ONLY), 619 DRM_IOCTL_DEF(DRM_IOCTL_DROP_MASTER, drm_dropmaster_ioctl, DRM_ROOT_ONLY), 620 621 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_ADD_CTX, drm_legacy_addctx, DRM_AUTH|DRM_ROOT_ONLY), 622 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_RM_CTX, drm_legacy_rmctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 623 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_MOD_CTX, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 624 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_GET_CTX, drm_legacy_getctx, DRM_AUTH), 625 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_SWITCH_CTX, drm_legacy_switchctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 626 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_NEW_CTX, drm_legacy_newctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 627 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_RES_CTX, drm_legacy_resctx, DRM_AUTH), 628 629 DRM_IOCTL_DEF(DRM_IOCTL_ADD_DRAW, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 630 DRM_IOCTL_DEF(DRM_IOCTL_RM_DRAW, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 631 632 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_LOCK, drm_legacy_lock, DRM_AUTH), 633 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_UNLOCK, drm_legacy_unlock, DRM_AUTH), 634 635 DRM_IOCTL_DEF(DRM_IOCTL_FINISH, drm_noop, DRM_AUTH), 636 637 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_ADD_BUFS, drm_legacy_addbufs, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 638 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_MARK_BUFS, drm_legacy_markbufs, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 639 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_INFO_BUFS, drm_legacy_infobufs, DRM_AUTH), 640 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_MAP_BUFS, drm_legacy_mapbufs, DRM_AUTH), 641 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_FREE_BUFS, drm_legacy_freebufs, DRM_AUTH), 642 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_DMA, drm_legacy_dma_ioctl, DRM_AUTH), 643 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_CONTROL, drm_legacy_irq_control, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 644 645 #if IS_ENABLED(CONFIG_AGP) 646 DRM_IOCTL_DEF(DRM_IOCTL_AGP_ACQUIRE, drm_agp_acquire_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 647 DRM_IOCTL_DEF(DRM_IOCTL_AGP_RELEASE, drm_agp_release_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 648 DRM_IOCTL_DEF(DRM_IOCTL_AGP_ENABLE, drm_agp_enable_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 649 DRM_IOCTL_DEF(DRM_IOCTL_AGP_INFO, drm_agp_info_ioctl, DRM_AUTH), 650 DRM_IOCTL_DEF(DRM_IOCTL_AGP_ALLOC, drm_agp_alloc_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 651 DRM_IOCTL_DEF(DRM_IOCTL_AGP_FREE, drm_agp_free_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 652 DRM_IOCTL_DEF(DRM_IOCTL_AGP_BIND, drm_agp_bind_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 653 DRM_IOCTL_DEF(DRM_IOCTL_AGP_UNBIND, drm_agp_unbind_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 654 #endif 655 656 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_SG_ALLOC, drm_legacy_sg_alloc, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 657 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_SG_FREE, drm_legacy_sg_free, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 658 659 DRM_IOCTL_DEF(DRM_IOCTL_WAIT_VBLANK, drm_wait_vblank_ioctl, DRM_UNLOCKED), 660 661 DRM_IOCTL_DEF(DRM_IOCTL_MODESET_CTL, drm_legacy_modeset_ctl_ioctl, 0), 662 663 DRM_IOCTL_DEF(DRM_IOCTL_UPDATE_DRAW, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), 664 665 DRM_IOCTL_DEF(DRM_IOCTL_GEM_CLOSE, drm_gem_close_ioctl, DRM_RENDER_ALLOW), 666 DRM_IOCTL_DEF(DRM_IOCTL_GEM_FLINK, drm_gem_flink_ioctl, DRM_AUTH), 667 DRM_IOCTL_DEF(DRM_IOCTL_GEM_OPEN, drm_gem_open_ioctl, DRM_AUTH), 668 669 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETRESOURCES, drm_mode_getresources, 0), 670 671 DRM_IOCTL_DEF(DRM_IOCTL_PRIME_HANDLE_TO_FD, drm_prime_handle_to_fd_ioctl, DRM_RENDER_ALLOW), 672 DRM_IOCTL_DEF(DRM_IOCTL_PRIME_FD_TO_HANDLE, drm_prime_fd_to_handle_ioctl, DRM_RENDER_ALLOW), 673 674 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPLANERESOURCES, drm_mode_getplane_res, 0), 675 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETCRTC, drm_mode_getcrtc, 0), 676 DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETCRTC, drm_mode_setcrtc, DRM_MASTER), 677 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPLANE, drm_mode_getplane, 0), 678 DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETPLANE, drm_mode_setplane, DRM_MASTER), 679 DRM_IOCTL_DEF(DRM_IOCTL_MODE_CURSOR, drm_mode_cursor_ioctl, DRM_MASTER), 680 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETGAMMA, drm_mode_gamma_get_ioctl, 0), 681 DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETGAMMA, drm_mode_gamma_set_ioctl, DRM_MASTER), 682 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETENCODER, drm_mode_getencoder, 0), 683 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETCONNECTOR, drm_mode_getconnector, 0), 684 DRM_IOCTL_DEF(DRM_IOCTL_MODE_ATTACHMODE, drm_noop, DRM_MASTER), 685 DRM_IOCTL_DEF(DRM_IOCTL_MODE_DETACHMODE, drm_noop, DRM_MASTER), 686 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPROPERTY, drm_mode_getproperty_ioctl, 0), 687 DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETPROPERTY, drm_connector_property_set_ioctl, DRM_MASTER), 688 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPROPBLOB, drm_mode_getblob_ioctl, 0), 689 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETFB, drm_mode_getfb, 0), 690 DRM_IOCTL_DEF(DRM_IOCTL_MODE_ADDFB, drm_mode_addfb_ioctl, 0), 691 DRM_IOCTL_DEF(DRM_IOCTL_MODE_ADDFB2, drm_mode_addfb2_ioctl, 0), 692 DRM_IOCTL_DEF(DRM_IOCTL_MODE_RMFB, drm_mode_rmfb_ioctl, 0), 693 DRM_IOCTL_DEF(DRM_IOCTL_MODE_PAGE_FLIP, drm_mode_page_flip_ioctl, DRM_MASTER), 694 DRM_IOCTL_DEF(DRM_IOCTL_MODE_DIRTYFB, drm_mode_dirtyfb_ioctl, DRM_MASTER), 695 DRM_IOCTL_DEF(DRM_IOCTL_MODE_CREATE_DUMB, drm_mode_create_dumb_ioctl, 0), 696 DRM_IOCTL_DEF(DRM_IOCTL_MODE_MAP_DUMB, drm_mode_mmap_dumb_ioctl, 0), 697 DRM_IOCTL_DEF(DRM_IOCTL_MODE_DESTROY_DUMB, drm_mode_destroy_dumb_ioctl, 0), 698 DRM_IOCTL_DEF(DRM_IOCTL_MODE_OBJ_GETPROPERTIES, drm_mode_obj_get_properties_ioctl, 0), 699 DRM_IOCTL_DEF(DRM_IOCTL_MODE_OBJ_SETPROPERTY, drm_mode_obj_set_property_ioctl, DRM_MASTER), 700 DRM_IOCTL_DEF(DRM_IOCTL_MODE_CURSOR2, drm_mode_cursor2_ioctl, DRM_MASTER), 701 DRM_IOCTL_DEF(DRM_IOCTL_MODE_ATOMIC, drm_mode_atomic_ioctl, DRM_MASTER), 702 DRM_IOCTL_DEF(DRM_IOCTL_MODE_CREATEPROPBLOB, drm_mode_createblob_ioctl, 0), 703 DRM_IOCTL_DEF(DRM_IOCTL_MODE_DESTROYPROPBLOB, drm_mode_destroyblob_ioctl, 0), 704 705 DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_CREATE, drm_syncobj_create_ioctl, 706 DRM_RENDER_ALLOW), 707 DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_DESTROY, drm_syncobj_destroy_ioctl, 708 DRM_RENDER_ALLOW), 709 DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_HANDLE_TO_FD, drm_syncobj_handle_to_fd_ioctl, 710 DRM_RENDER_ALLOW), 711 DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_FD_TO_HANDLE, drm_syncobj_fd_to_handle_ioctl, 712 DRM_RENDER_ALLOW), 713 DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_TRANSFER, drm_syncobj_transfer_ioctl, 714 DRM_RENDER_ALLOW), 715 DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_WAIT, drm_syncobj_wait_ioctl, 716 DRM_RENDER_ALLOW), 717 DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_TIMELINE_WAIT, drm_syncobj_timeline_wait_ioctl, 718 DRM_RENDER_ALLOW), 719 DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_RESET, drm_syncobj_reset_ioctl, 720 DRM_RENDER_ALLOW), 721 DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_SIGNAL, drm_syncobj_signal_ioctl, 722 DRM_RENDER_ALLOW), 723 DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_TIMELINE_SIGNAL, drm_syncobj_timeline_signal_ioctl, 724 DRM_RENDER_ALLOW), 725 DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_QUERY, drm_syncobj_query_ioctl, 726 DRM_RENDER_ALLOW), 727 DRM_IOCTL_DEF(DRM_IOCTL_CRTC_GET_SEQUENCE, drm_crtc_get_sequence_ioctl, 0), 728 DRM_IOCTL_DEF(DRM_IOCTL_CRTC_QUEUE_SEQUENCE, drm_crtc_queue_sequence_ioctl, 0), 729 DRM_IOCTL_DEF(DRM_IOCTL_MODE_CREATE_LEASE, drm_mode_create_lease_ioctl, DRM_MASTER), 730 DRM_IOCTL_DEF(DRM_IOCTL_MODE_LIST_LESSEES, drm_mode_list_lessees_ioctl, DRM_MASTER), 731 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GET_LEASE, drm_mode_get_lease_ioctl, DRM_MASTER), 732 DRM_IOCTL_DEF(DRM_IOCTL_MODE_REVOKE_LEASE, drm_mode_revoke_lease_ioctl, DRM_MASTER), 733 }; 734 735 #define DRM_CORE_IOCTL_COUNT ARRAY_SIZE( drm_ioctls ) 736 737 /** 738 * DOC: driver specific ioctls 739 * 740 * First things first, driver private IOCTLs should only be needed for drivers 741 * supporting rendering. Kernel modesetting is all standardized, and extended 742 * through properties. There are a few exceptions in some existing drivers, 743 * which define IOCTL for use by the display DRM master, but they all predate 744 * properties. 745 * 746 * Now if you do have a render driver you always have to support it through 747 * driver private properties. There's a few steps needed to wire all the things 748 * up. 749 * 750 * First you need to define the structure for your IOCTL in your driver private 751 * UAPI header in ``include/uapi/drm/my_driver_drm.h``:: 752 * 753 * struct my_driver_operation { 754 * u32 some_thing; 755 * u32 another_thing; 756 * }; 757 * 758 * Please make sure that you follow all the best practices from 759 * ``Documentation/ioctl/botching-up-ioctls.rst``. Note that drm_ioctl() 760 * automatically zero-extends structures, hence make sure you can add more stuff 761 * at the end, i.e. don't put a variable sized array there. 762 * 763 * Then you need to define your IOCTL number, using one of DRM_IO(), DRM_IOR(), 764 * DRM_IOW() or DRM_IOWR(). It must start with the DRM_IOCTL\_ prefix:: 765 * 766 * ##define DRM_IOCTL_MY_DRIVER_OPERATION \ 767 * DRM_IOW(DRM_COMMAND_BASE, struct my_driver_operation) 768 * 769 * DRM driver private IOCTL must be in the range from DRM_COMMAND_BASE to 770 * DRM_COMMAND_END. Finally you need an array of &struct drm_ioctl_desc to wire 771 * up the handlers and set the access rights:: 772 * 773 * static const struct drm_ioctl_desc my_driver_ioctls[] = { 774 * DRM_IOCTL_DEF_DRV(MY_DRIVER_OPERATION, my_driver_operation, 775 * DRM_AUTH|DRM_RENDER_ALLOW), 776 * }; 777 * 778 * And then assign this to the &drm_driver.ioctls field in your driver 779 * structure. 780 * 781 * See the separate chapter on :ref:`file operations<drm_driver_fops>` for how 782 * the driver-specific IOCTLs are wired up. 783 */ 784 785 long drm_ioctl_kernel(struct file *file, drm_ioctl_t *func, void *kdata, 786 u32 flags) 787 { 788 #ifdef __NetBSD__ 789 struct drm_file *file_priv = file->f_data; 790 #else 791 struct drm_file *file_priv = file->private_data; 792 #endif 793 struct drm_device *dev = file_priv->minor->dev; 794 int retcode; 795 796 if (drm_dev_is_unplugged(dev)) 797 return -ENODEV; 798 799 retcode = drm_ioctl_permit(flags, file_priv); 800 if (unlikely(retcode)) 801 return retcode; 802 803 /* Enforce sane locking for modern driver ioctls. */ 804 if (likely(!drm_core_check_feature(dev, DRIVER_LEGACY)) || 805 (flags & DRM_UNLOCKED)) 806 retcode = func(dev, kdata, file_priv); 807 else { 808 mutex_lock(&drm_global_mutex); 809 retcode = func(dev, kdata, file_priv); 810 mutex_unlock(&drm_global_mutex); 811 } 812 return retcode; 813 } 814 EXPORT_SYMBOL(drm_ioctl_kernel); 815 816 /** 817 * drm_ioctl - ioctl callback implementation for DRM drivers 818 * @filp: file this ioctl is called on 819 * @cmd: ioctl cmd number 820 * @arg: user argument 821 * 822 * Looks up the ioctl function in the DRM core and the driver dispatch table, 823 * stored in &drm_driver.ioctls. It checks for necessary permission by calling 824 * drm_ioctl_permit(), and dispatches to the respective function. 825 * 826 * Returns: 827 * Zero on success, negative error code on failure. 828 */ 829 #ifdef __NetBSD__ 830 #include <sys/file.h> 831 int 832 drm_ioctl(struct file *fp, unsigned long cmd, void *data) 833 { 834 char stackbuf[128]; 835 char *buf = stackbuf; 836 void *data0 = data; 837 struct drm_file *const file = fp->f_data; 838 const unsigned int nr = DRM_IOCTL_NR(cmd); 839 int error; 840 841 switch (cmd) { 842 case FIONBIO: 843 case FIOASYNC: 844 return 0; 845 default: 846 break; 847 } 848 849 if (IOCGROUP(cmd) != DRM_IOCTL_BASE) 850 return EINVAL; 851 852 KASSERT(file != NULL); 853 KASSERT(file->minor != NULL); 854 KASSERT(file->minor->dev != NULL); 855 struct drm_device *const dev = file->minor->dev; 856 const struct drm_ioctl_desc *ioctl; 857 858 if (drm_dev_is_unplugged(dev)) 859 return ENXIO; 860 861 const bool is_driver_ioctl = 862 (DRM_COMMAND_BASE <= nr) && (nr < DRM_COMMAND_END); 863 864 if (is_driver_ioctl) { 865 const unsigned int driver_nr = nr - DRM_COMMAND_BASE; 866 if (driver_nr >= dev->driver->num_ioctls) 867 return EINVAL; 868 ioctl = &dev->driver->ioctls[driver_nr]; 869 } else if (nr < __arraycount(drm_ioctls)) { 870 ioctl = &drm_ioctls[nr]; 871 } else { 872 ioctl = NULL; 873 } 874 875 if ((ioctl == NULL) || (ioctl->func == NULL)) 876 return EINVAL; 877 878 /* XXX errno Linux->NetBSD */ 879 error = -drm_ioctl_permit(ioctl->flags, file); 880 if (error) 881 return error; 882 883 /* If userland passed in too few bytes, zero-pad them. */ 884 if (IOCPARM_LEN(cmd) < IOCPARM_LEN(ioctl->cmd)) { 885 /* 12-bit quantity, according to <sys/ioccom.h> */ 886 KASSERT(IOCPARM_LEN(ioctl->cmd) <= 4096); 887 if (IOCPARM_LEN(ioctl->cmd) > sizeof stackbuf) { 888 buf = kmem_alloc(IOCPARM_LEN(ioctl->cmd), KM_NOSLEEP); 889 if (buf == NULL) 890 return ENOMEM; 891 } 892 memcpy(buf, data, IOCPARM_LEN(cmd)); 893 memset(buf + IOCPARM_LEN(cmd), 0, 894 IOCPARM_LEN(ioctl->cmd) - IOCPARM_LEN(cmd)); 895 data0 = buf; 896 } 897 898 if ((drm_core_check_feature(dev, DRIVER_MODESET) && is_driver_ioctl) || 899 ISSET(ioctl->flags, DRM_UNLOCKED)) { 900 /* XXX errno Linux->NetBSD */ 901 error = -(*ioctl->func)(dev, data0, file); 902 } else { 903 mutex_lock(&drm_global_mutex); 904 /* XXX errno Linux->NetBSD */ 905 error = -(*ioctl->func)(dev, data0, file); 906 mutex_unlock(&drm_global_mutex); 907 } 908 909 /* If we used a temporary buffer, copy it back out. */ 910 if (data != data0) 911 memcpy(data, data0, IOCPARM_LEN(cmd)); 912 913 /* If we had to allocate a heap buffer, free it. */ 914 if (buf != stackbuf) 915 kmem_free(buf, IOCPARM_LEN(ioctl->cmd)); 916 917 return error; 918 } 919 #else 920 long drm_ioctl(struct file *filp, 921 unsigned int cmd, unsigned long arg) 922 { 923 struct drm_file *file_priv = filp->private_data; 924 struct drm_device *dev; 925 const struct drm_ioctl_desc *ioctl = NULL; 926 drm_ioctl_t *func; 927 unsigned int nr = DRM_IOCTL_NR(cmd); 928 int retcode = -EINVAL; 929 char stack_kdata[128]; 930 char *kdata = NULL; 931 unsigned int in_size, out_size, drv_size, ksize; 932 bool is_driver_ioctl; 933 934 dev = file_priv->minor->dev; 935 936 if (drm_dev_is_unplugged(dev)) 937 return -ENODEV; 938 939 is_driver_ioctl = nr >= DRM_COMMAND_BASE && nr < DRM_COMMAND_END; 940 941 if (is_driver_ioctl) { 942 /* driver ioctl */ 943 unsigned int index = nr - DRM_COMMAND_BASE; 944 945 if (index >= dev->driver->num_ioctls) 946 goto err_i1; 947 index = array_index_nospec(index, dev->driver->num_ioctls); 948 ioctl = &dev->driver->ioctls[index]; 949 } else { 950 /* core ioctl */ 951 if (nr >= DRM_CORE_IOCTL_COUNT) 952 goto err_i1; 953 nr = array_index_nospec(nr, DRM_CORE_IOCTL_COUNT); 954 ioctl = &drm_ioctls[nr]; 955 } 956 957 drv_size = _IOC_SIZE(ioctl->cmd); 958 out_size = in_size = _IOC_SIZE(cmd); 959 if ((cmd & ioctl->cmd & IOC_IN) == 0) 960 in_size = 0; 961 if ((cmd & ioctl->cmd & IOC_OUT) == 0) 962 out_size = 0; 963 ksize = max(max(in_size, out_size), drv_size); 964 965 DRM_DEBUG("pid=%d, dev=0x%lx, auth=%d, %s\n", 966 task_pid_nr(current), 967 (long)old_encode_dev(file_priv->minor->kdev->devt), 968 file_priv->authenticated, ioctl->name); 969 970 /* Do not trust userspace, use our own definition */ 971 func = ioctl->func; 972 973 if (unlikely(!func)) { 974 DRM_DEBUG("no function\n"); 975 retcode = -EINVAL; 976 goto err_i1; 977 } 978 979 if (ksize <= sizeof(stack_kdata)) { 980 kdata = stack_kdata; 981 } else { 982 kdata = kmalloc(ksize, GFP_KERNEL); 983 if (!kdata) { 984 retcode = -ENOMEM; 985 goto err_i1; 986 } 987 } 988 989 if (copy_from_user(kdata, (void __user *)arg, in_size) != 0) { 990 retcode = -EFAULT; 991 goto err_i1; 992 } 993 994 if (ksize > in_size) 995 memset(kdata + in_size, 0, ksize - in_size); 996 997 retcode = drm_ioctl_kernel(filp, func, kdata, ioctl->flags); 998 if (copy_to_user((void __user *)arg, kdata, out_size) != 0) 999 retcode = -EFAULT; 1000 1001 err_i1: 1002 if (!ioctl) 1003 DRM_DEBUG("invalid ioctl: pid=%d, dev=0x%lx, auth=%d, cmd=0x%02x, nr=0x%02x\n", 1004 task_pid_nr(current), 1005 (long)old_encode_dev(file_priv->minor->kdev->devt), 1006 file_priv->authenticated, cmd, nr); 1007 1008 if (kdata != stack_kdata) 1009 kfree(kdata); 1010 if (retcode) 1011 DRM_DEBUG("pid=%d, ret = %d\n", task_pid_nr(current), retcode); 1012 return retcode; 1013 } 1014 #endif 1015 EXPORT_SYMBOL(drm_ioctl); 1016 1017 /** 1018 * drm_ioctl_flags - Check for core ioctl and return ioctl permission flags 1019 * @nr: ioctl number 1020 * @flags: where to return the ioctl permission flags 1021 * 1022 * This ioctl is only used by the vmwgfx driver to augment the access checks 1023 * done by the drm core and insofar a pretty decent layering violation. This 1024 * shouldn't be used by any drivers. 1025 * 1026 * Returns: 1027 * True if the @nr corresponds to a DRM core ioctl number, false otherwise. 1028 */ 1029 bool drm_ioctl_flags(unsigned int nr, unsigned int *flags) 1030 { 1031 if (nr >= DRM_COMMAND_BASE && nr < DRM_COMMAND_END) 1032 return false; 1033 1034 if (nr >= DRM_CORE_IOCTL_COUNT) 1035 return false; 1036 nr = array_index_nospec(nr, DRM_CORE_IOCTL_COUNT); 1037 1038 *flags = drm_ioctls[nr].flags; 1039 return true; 1040 } 1041 EXPORT_SYMBOL(drm_ioctl_flags); 1042
Indexes created Wed Oct 15 16:09:53 GMT 2025