1 /* 2 * Copyright © 2017 Keith Packard <keithp@keithp.com> 3 * 4 * This program is free software; you can redistribute it and/or modify 5 * it under the terms of the GNU General Public License as published by 6 * the Free Software Foundation, either version 2 of the License, or 7 * (at your option) any later version. 8 * 9 * This program is distributed in the hope that it will be useful, but 10 * WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 12 * General Public License for more details. 13 */ 14 15 #include <drm/drmP.h> 16 #include "drm_internal.h" 17 #include "drm_legacy.h" 18 #include "drm_crtc_internal.h" 19 #include <drm/drm_lease.h> 20 #include <drm/drm_auth.h> 21 #include <drm/drm_crtc_helper.h> 22 23 #define drm_for_each_lessee(lessee, lessor) \ 24 list_for_each_entry((lessee), &(lessor)->lessees, lessee_list) 25 26 static uint64_t drm_lease_idr_object; 27 28 /** 29 * drm_lease_owner - return ancestor owner drm_master 30 * @master: drm_master somewhere within tree of lessees and lessors 31 * 32 * RETURN: 33 * 34 * drm_master at the top of the tree (i.e, with lessor NULL 35 */ 36 struct drm_master *drm_lease_owner(struct drm_master *master) 37 { 38 while (master->lessor != NULL) 39 master = master->lessor; 40 return master; 41 } 42 43 /** 44 * _drm_find_lessee - find lessee by id (idr_mutex held) 45 * @master: drm_master of lessor 46 * @lessee_id: id 47 * 48 * RETURN: 49 * 50 * drm_master of the lessee if valid, NULL otherwise 51 */ 52 53 static struct drm_master* 54 _drm_find_lessee(struct drm_master *master, int lessee_id) 55 { 56 lockdep_assert_held(&master->dev->mode_config.idr_mutex); 57 return idr_find(&drm_lease_owner(master)->lessee_idr, lessee_id); 58 } 59 60 /** 61 * _drm_lease_held_master - check to see if an object is leased (or owned) by master (idr_mutex held) 62 * @master: the master to check the lease status of 63 * @id: the id to check 64 * 65 * Checks if the specified master holds a lease on the object. Return 66 * value: 67 * 68 * true 'master' holds a lease on (or owns) the object 69 * false 'master' does not hold a lease. 70 */ 71 static int _drm_lease_held_master(struct drm_master *master, int id) 72 { 73 lockdep_assert_held(&master->dev->mode_config.idr_mutex); 74 if (master->lessor) 75 return idr_find(&master->leases, id) != NULL; 76 return true; 77 } 78 79 /** 80 * _drm_has_leased - check to see if an object has been leased (idr_mutex held) 81 * @master: the master to check the lease status of 82 * @id: the id to check 83 * 84 * Checks if any lessee of 'master' holds a lease on 'id'. Return 85 * value: 86 * 87 * true Some lessee holds a lease on the object. 88 * false No lessee has a lease on the object. 89 */ 90 static bool _drm_has_leased(struct drm_master *master, int id) 91 { 92 struct drm_master *lessee; 93 94 lockdep_assert_held(&master->dev->mode_config.idr_mutex); 95 drm_for_each_lessee(lessee, master) 96 if (_drm_lease_held_master(lessee, id)) 97 return true; 98 return false; 99 } 100 101 /** 102 * _drm_lease_held - check drm_mode_object lease status (idr_mutex held) 103 * @file_priv: the master drm_file 104 * @id: the object id 105 * 106 * Checks if the specified master holds a lease on the object. Return 107 * value: 108 * 109 * true 'master' holds a lease on (or owns) the object 110 * false 'master' does not hold a lease. 111 */ 112 bool _drm_lease_held(struct drm_file *file_priv, int id) 113 { 114 if (file_priv == NULL || file_priv->master == NULL) 115 return true; 116 117 return _drm_lease_held_master(file_priv->master, id); 118 } 119 120 /** 121 * drm_lease_held - check drm_mode_object lease status (idr_mutex not held) 122 * @file_priv: the master drm_file 123 * @id: the object id 124 * 125 * Checks if the specified master holds a lease on the object. Return 126 * value: 127 * 128 * true 'master' holds a lease on (or owns) the object 129 * false 'master' does not hold a lease. 130 */ 131 bool drm_lease_held(struct drm_file *file_priv, int id) 132 { 133 struct drm_master *master; 134 bool ret; 135 136 if (file_priv == NULL || file_priv->master == NULL) 137 return true; 138 139 master = file_priv->master; 140 mutex_lock(&master->dev->mode_config.idr_mutex); 141 ret = _drm_lease_held_master(master, id); 142 mutex_unlock(&master->dev->mode_config.idr_mutex); 143 return ret; 144 } 145 146 /** 147 * drm_lease_filter_crtcs - restricted crtc set to leased values (idr_mutex not held) 148 * @file_priv: requestor file 149 * @crtcs_in: bitmask of crtcs to check 150 * 151 * Reconstructs a crtc mask based on the crtcs which are visible 152 * through the specified file. 153 */ 154 uint32_t drm_lease_filter_crtcs(struct drm_file *file_priv, uint32_t crtcs_in) 155 { 156 struct drm_master *master; 157 struct drm_device *dev; 158 struct drm_crtc *crtc; 159 int count_in, count_out; 160 uint32_t crtcs_out = 0; 161 162 if (file_priv == NULL || file_priv->master == NULL) 163 return crtcs_in; 164 165 master = file_priv->master; 166 dev = master->dev; 167 168 count_in = count_out = 0; 169 mutex_lock(&master->dev->mode_config.idr_mutex); 170 list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) { 171 if (_drm_lease_held_master(master, crtc->base.id)) { 172 uint32_t mask_in = 1ul << count_in; 173 if ((crtcs_in & mask_in) != 0) { 174 uint32_t mask_out = 1ul << count_out; 175 crtcs_out |= mask_out; 176 } 177 count_out++; 178 } 179 count_in++; 180 } 181 mutex_unlock(&master->dev->mode_config.idr_mutex); 182 return crtcs_out; 183 } 184 185 /* 186 * drm_lease_create - create a new drm_master with leased objects (idr_mutex not held) 187 * @lessor: lease holder (or owner) of objects 188 * @leases: objects to lease to the new drm_master 189 * 190 * Uses drm_master_create to allocate a new drm_master, then checks to 191 * make sure all of the desired objects can be leased, atomically 192 * leasing them to the new drmmaster. 193 * 194 * ERR_PTR(-EACCES) some other master holds the title to any object 195 * ERR_PTR(-ENOENT) some object is not a valid DRM object for this device 196 * ERR_PTR(-EBUSY) some other lessee holds title to this object 197 * ERR_PTR(-EEXIST) same object specified more than once in the provided list 198 * ERR_PTR(-ENOMEM) allocation failed 199 */ 200 static struct drm_master *drm_lease_create(struct drm_master *lessor, struct idr *leases) 201 { 202 struct drm_device *dev = lessor->dev; 203 int error; 204 struct drm_master *lessee; 205 int object; 206 int id; 207 void *entry; 208 209 DRM_DEBUG_LEASE("lessor %d\n", lessor->lessee_id); 210 211 lessee = drm_master_create(lessor->dev); 212 if (!lessee) { 213 DRM_DEBUG_LEASE("drm_master_create failed\n"); 214 return ERR_PTR(-ENOMEM); 215 } 216 217 mutex_lock(&dev->mode_config.idr_mutex); 218 219 idr_for_each_entry(leases, entry, object) { 220 error = 0; 221 if (!idr_find(&dev->mode_config.object_idr, object)) 222 error = -ENOENT; 223 else if (!_drm_lease_held_master(lessor, object)) 224 error = -EACCES; 225 else if (_drm_has_leased(lessor, object)) 226 error = -EBUSY; 227 228 if (error != 0) { 229 DRM_DEBUG_LEASE("object %d failed %d\n", object, error); 230 goto out_lessee; 231 } 232 } 233 234 /* Insert the new lessee into the tree */ 235 id = idr_alloc(&(drm_lease_owner(lessor)->lessee_idr), lessee, 1, 0, GFP_KERNEL); 236 if (id < 0) { 237 error = id; 238 goto out_lessee; 239 } 240 241 lessee->lessee_id = id; 242 lessee->lessor = drm_master_get(lessor); 243 list_add_tail(&lessee->lessee_list, &lessor->lessees); 244 245 /* Move the leases over */ 246 lessee->leases = *leases; 247 DRM_DEBUG_LEASE("new lessee %d %p, lessor %d %p\n", lessee->lessee_id, lessee, lessor->lessee_id, lessor); 248 249 mutex_unlock(&dev->mode_config.idr_mutex); 250 return lessee; 251 252 out_lessee: 253 mutex_unlock(&dev->mode_config.idr_mutex); 254 255 drm_master_put(&lessee); 256 257 return ERR_PTR(error); 258 } 259 260 /** 261 * drm_lease_destroy - a master is going away (idr_mutex not held) 262 * @master: the drm_master being destroyed 263 * 264 * All lessees will have been destroyed as they 265 * hold a reference on their lessor. Notify any 266 * lessor for this master so that it can check 267 * the list of lessees. 268 */ 269 void drm_lease_destroy(struct drm_master *master) 270 { 271 struct drm_device *dev = master->dev; 272 273 mutex_lock(&dev->mode_config.idr_mutex); 274 275 DRM_DEBUG_LEASE("drm_lease_destroy %d\n", master->lessee_id); 276 277 /* This master is referenced by all lessees, hence it cannot be destroyed 278 * until all of them have been 279 */ 280 WARN_ON(!list_empty(&master->lessees)); 281 282 /* Remove this master from the lessee idr in the owner */ 283 if (master->lessee_id != 0) { 284 DRM_DEBUG_LEASE("remove master %d from device list of lessees\n", master->lessee_id); 285 idr_remove(&(drm_lease_owner(master)->lessee_idr), master->lessee_id); 286 } 287 288 /* Remove this master from any lessee list it may be on */ 289 list_del(&master->lessee_list); 290 291 mutex_unlock(&dev->mode_config.idr_mutex); 292 293 if (master->lessor) { 294 /* Tell the master to check the lessee list */ 295 drm_sysfs_lease_event(dev); 296 drm_master_put(&master->lessor); 297 } 298 299 DRM_DEBUG_LEASE("drm_lease_destroy done %d\n", master->lessee_id); 300 } 301 302 /** 303 * _drm_lease_revoke - revoke access to all leased objects (idr_mutex held) 304 * @top: the master losing its lease 305 */ 306 static void _drm_lease_revoke(struct drm_master *top) 307 { 308 int object; 309 void *entry; 310 struct drm_master *master = top; 311 312 lockdep_assert_held(&top->dev->mode_config.idr_mutex); 313 314 /* 315 * Walk the tree starting at 'top' emptying all leases. Because 316 * the tree is fully connected, we can do this without recursing 317 */ 318 for (;;) { 319 DRM_DEBUG_LEASE("revoke leases for %p %d\n", master, master->lessee_id); 320 321 /* Evacuate the lease */ 322 idr_for_each_entry(&master->leases, entry, object) 323 idr_remove(&master->leases, object); 324 325 /* Depth-first list walk */ 326 327 /* Down */ 328 if (!list_empty(&master->lessees)) { 329 master = list_first_entry(&master->lessees, struct drm_master, lessee_list); 330 } else { 331 /* Up */ 332 while (master != top && master == list_last_entry(&master->lessor->lessees, struct drm_master, lessee_list)) 333 master = master->lessor; 334 335 if (master == top) 336 break; 337 338 /* Over */ 339 master = list_next_entry(master, lessee_list); 340 } 341 } 342 } 343 344 /** 345 * drm_lease_revoke - revoke access to all leased objects (idr_mutex not held) 346 * @top: the master losing its lease 347 */ 348 void drm_lease_revoke(struct drm_master *top) 349 { 350 mutex_lock(&top->dev->mode_config.idr_mutex); 351 _drm_lease_revoke(top); 352 mutex_unlock(&top->dev->mode_config.idr_mutex); 353 } 354 355 static int validate_lease(struct drm_device *dev, 356 int object_count, 357 struct drm_mode_object **objects, 358 bool universal_planes) 359 { 360 int o; 361 int has_crtc = -1; 362 int has_connector = -1; 363 int has_plane = -1; 364 365 /* we want to confirm that there is at least one crtc, plane 366 connector object. */ 367 368 for (o = 0; o < object_count; o++) { 369 if (objects[o]->type == DRM_MODE_OBJECT_CRTC && has_crtc == -1) { 370 has_crtc = o; 371 } 372 if (objects[o]->type == DRM_MODE_OBJECT_CONNECTOR && has_connector == -1) 373 has_connector = o; 374 375 if (universal_planes) { 376 if (objects[o]->type == DRM_MODE_OBJECT_PLANE && has_plane == -1) 377 has_plane = o; 378 } 379 } 380 if (has_crtc == -1 || has_connector == -1) 381 return -EINVAL; 382 if (universal_planes && has_plane == -1) 383 return -EINVAL; 384 return 0; 385 } 386 387 static int fill_object_idr(struct drm_device *dev, 388 struct drm_file *lessor_priv, 389 struct idr *leases, 390 int object_count, 391 u32 *object_ids) 392 { 393 struct drm_mode_object **objects; 394 u32 o; 395 int ret; 396 bool universal_planes = READ_ONCE(lessor_priv->universal_planes); 397 398 objects = kcalloc(object_count, sizeof(struct drm_mode_object *), 399 GFP_KERNEL); 400 if (!objects) 401 return -ENOMEM; 402 403 /* step one - get references to all the mode objects 404 and check for validity. */ 405 for (o = 0; o < object_count; o++) { 406 if ((int) object_ids[o] < 0) { 407 ret = -EINVAL; 408 goto out_free_objects; 409 } 410 411 objects[o] = drm_mode_object_find(dev, lessor_priv, 412 object_ids[o], 413 DRM_MODE_OBJECT_ANY); 414 if (!objects[o]) { 415 ret = -ENOENT; 416 goto out_free_objects; 417 } 418 419 if (!drm_mode_object_lease_required(objects[o]->type)) { 420 DRM_DEBUG_KMS("invalid object for lease\n"); 421 ret = -EINVAL; 422 goto out_free_objects; 423 } 424 } 425 426 ret = validate_lease(dev, object_count, objects, universal_planes); 427 if (ret) { 428 DRM_DEBUG_LEASE("lease validation failed\n"); 429 goto out_free_objects; 430 } 431 432 /* add their IDs to the lease request - taking into account 433 universal planes */ 434 for (o = 0; o < object_count; o++) { 435 struct drm_mode_object *obj = objects[o]; 436 u32 object_id = objects[o]->id; 437 DRM_DEBUG_LEASE("Adding object %d to lease\n", object_id); 438 439 /* 440 * We're using an IDR to hold the set of leased 441 * objects, but we don't need to point at the object's 442 * data structure from the lease as the main object_idr 443 * will be used to actually find that. Instead, all we 444 * really want is a 'leased/not-leased' result, for 445 * which any non-NULL pointer will work fine. 446 */ 447 ret = idr_alloc(leases, &drm_lease_idr_object , object_id, object_id + 1, GFP_KERNEL); 448 if (ret < 0) { 449 DRM_DEBUG_LEASE("Object %d cannot be inserted into leases (%d)\n", 450 object_id, ret); 451 goto out_free_objects; 452 } 453 if (obj->type == DRM_MODE_OBJECT_CRTC && !universal_planes) { 454 struct drm_crtc *crtc = obj_to_crtc(obj); 455 ret = idr_alloc(leases, &drm_lease_idr_object, crtc->primary->base.id, crtc->primary->base.id + 1, GFP_KERNEL); 456 if (ret < 0) { 457 DRM_DEBUG_LEASE("Object primary plane %d cannot be inserted into leases (%d)\n", 458 object_id, ret); 459 goto out_free_objects; 460 } 461 if (crtc->cursor) { 462 ret = idr_alloc(leases, &drm_lease_idr_object, crtc->cursor->base.id, crtc->cursor->base.id + 1, GFP_KERNEL); 463 if (ret < 0) { 464 DRM_DEBUG_LEASE("Object cursor plane %d cannot be inserted into leases (%d)\n", 465 object_id, ret); 466 goto out_free_objects; 467 } 468 } 469 } 470 } 471 472 ret = 0; 473 out_free_objects: 474 for (o = 0; o < object_count; o++) { 475 if (objects[o]) 476 drm_mode_object_put(objects[o]); 477 } 478 kfree(objects); 479 return ret; 480 } 481 482 /** 483 * drm_mode_create_lease_ioctl - create a new lease 484 * @dev: the drm device 485 * @data: pointer to struct drm_mode_create_lease 486 * @lessor_priv: the file being manipulated 487 * 488 * The master associated with the specified file will have a lease 489 * created containing the objects specified in the ioctl structure. 490 * A file descriptor will be allocated for that and returned to the 491 * application. 492 */ 493 int drm_mode_create_lease_ioctl(struct drm_device *dev, 494 void *data, struct drm_file *lessor_priv) 495 { 496 struct drm_mode_create_lease *cl = data; 497 size_t object_count; 498 int ret = 0; 499 struct idr leases; 500 struct drm_master *lessor = lessor_priv->master; 501 struct drm_master *lessee = NULL; 502 struct file *lessee_file = NULL; 503 struct file *lessor_file = lessor_priv->filp; 504 struct drm_file *lessee_priv; 505 int fd = -1; 506 uint32_t *object_ids; 507 508 /* Can't lease without MODESET */ 509 if (!drm_core_check_feature(dev, DRIVER_MODESET)) 510 return -EOPNOTSUPP; 511 512 /* Do not allow sub-leases */ 513 if (lessor->lessor) { 514 DRM_DEBUG_LEASE("recursive leasing not allowed\n"); 515 return -EINVAL; 516 } 517 518 /* need some objects */ 519 if (cl->object_count == 0) { 520 DRM_DEBUG_LEASE("no objects in lease\n"); 521 return -EINVAL; 522 } 523 524 if (cl->flags && (cl->flags & ~(O_CLOEXEC | O_NONBLOCK))) { 525 DRM_DEBUG_LEASE("invalid flags\n"); 526 return -EINVAL; 527 } 528 529 object_count = cl->object_count; 530 531 object_ids = memdup_user(u64_to_user_ptr(cl->object_ids), 532 array_size(object_count, sizeof(__u32))); 533 if (IS_ERR(object_ids)) 534 return PTR_ERR(object_ids); 535 536 idr_init(&leases); 537 538 /* fill and validate the object idr */ 539 ret = fill_object_idr(dev, lessor_priv, &leases, 540 object_count, object_ids); 541 kfree(object_ids); 542 if (ret) { 543 DRM_DEBUG_LEASE("lease object lookup failed: %i\n", ret); 544 idr_destroy(&leases); 545 return ret; 546 } 547 548 /* Allocate a file descriptor for the lease */ 549 fd = get_unused_fd_flags(cl->flags & (O_CLOEXEC | O_NONBLOCK)); 550 if (fd < 0) { 551 idr_destroy(&leases); 552 return fd; 553 } 554 555 DRM_DEBUG_LEASE("Creating lease\n"); 556 lessee = drm_lease_create(lessor, &leases); 557 558 if (IS_ERR(lessee)) { 559 ret = PTR_ERR(lessee); 560 goto out_leases; 561 } 562 563 /* Clone the lessor file to create a new file for us */ 564 DRM_DEBUG_LEASE("Allocating lease file\n"); 565 lessee_file = file_clone_open(lessor_file); 566 if (IS_ERR(lessee_file)) { 567 ret = PTR_ERR(lessee_file); 568 goto out_lessee; 569 } 570 571 lessee_priv = lessee_file->private_data; 572 /* Change the file to a master one */ 573 drm_master_put(&lessee_priv->master); 574 lessee_priv->master = lessee; 575 lessee_priv->is_master = 1; 576 lessee_priv->authenticated = 1; 577 578 /* Pass fd back to userspace */ 579 DRM_DEBUG_LEASE("Returning fd %d id %d\n", fd, lessee->lessee_id); 580 cl->fd = fd; 581 cl->lessee_id = lessee->lessee_id; 582 583 /* Hook up the fd */ 584 fd_install(fd, lessee_file); 585 586 DRM_DEBUG_LEASE("drm_mode_create_lease_ioctl succeeded\n"); 587 return 0; 588 589 out_lessee: 590 drm_master_put(&lessee); 591 592 out_leases: 593 put_unused_fd(fd); 594 idr_destroy(&leases); 595 596 DRM_DEBUG_LEASE("drm_mode_create_lease_ioctl failed: %d\n", ret); 597 return ret; 598 } 599 600 /** 601 * drm_mode_list_lessees_ioctl - list lessee ids 602 * @dev: the drm device 603 * @data: pointer to struct drm_mode_list_lessees 604 * @lessor_priv: the file being manipulated 605 * 606 * Starting from the master associated with the specified file, 607 * the master with the provided lessee_id is found, and then 608 * an array of lessee ids associated with leases from that master 609 * are returned. 610 */ 611 612 int drm_mode_list_lessees_ioctl(struct drm_device *dev, 613 void *data, struct drm_file *lessor_priv) 614 { 615 struct drm_mode_list_lessees *arg = data; 616 __u32 __user *lessee_ids = (__u32 __user *) (uintptr_t) (arg->lessees_ptr); 617 __u32 count_lessees = arg->count_lessees; 618 struct drm_master *lessor = lessor_priv->master, *lessee; 619 int count; 620 int ret = 0; 621 622 if (arg->pad) 623 return -EINVAL; 624 625 /* Can't lease without MODESET */ 626 if (!drm_core_check_feature(dev, DRIVER_MODESET)) 627 return -EOPNOTSUPP; 628 629 DRM_DEBUG_LEASE("List lessees for %d\n", lessor->lessee_id); 630 631 mutex_lock(&dev->mode_config.idr_mutex); 632 633 count = 0; 634 drm_for_each_lessee(lessee, lessor) { 635 /* Only list un-revoked leases */ 636 if (!idr_is_empty(&lessee->leases)) { 637 if (count_lessees > count) { 638 DRM_DEBUG_LEASE("Add lessee %d\n", lessee->lessee_id); 639 ret = put_user(lessee->lessee_id, lessee_ids + count); 640 if (ret) 641 break; 642 } 643 count++; 644 } 645 } 646 647 DRM_DEBUG_LEASE("Lessor leases to %d\n", count); 648 if (ret == 0) 649 arg->count_lessees = count; 650 651 mutex_unlock(&dev->mode_config.idr_mutex); 652 653 return ret; 654 } 655 656 /** 657 * drm_mode_get_lease_ioctl - list leased objects 658 * @dev: the drm device 659 * @data: pointer to struct drm_mode_get_lease 660 * @lessee_priv: the file being manipulated 661 * 662 * Return the list of leased objects for the specified lessee 663 */ 664 665 int drm_mode_get_lease_ioctl(struct drm_device *dev, 666 void *data, struct drm_file *lessee_priv) 667 { 668 struct drm_mode_get_lease *arg = data; 669 __u32 __user *object_ids = (__u32 __user *) (uintptr_t) (arg->objects_ptr); 670 __u32 count_objects = arg->count_objects; 671 struct drm_master *lessee = lessee_priv->master; 672 struct idr *object_idr; 673 int count; 674 void *entry; 675 int object; 676 int ret = 0; 677 678 if (arg->pad) 679 return -EINVAL; 680 681 /* Can't lease without MODESET */ 682 if (!drm_core_check_feature(dev, DRIVER_MODESET)) 683 return -EOPNOTSUPP; 684 685 DRM_DEBUG_LEASE("get lease for %d\n", lessee->lessee_id); 686 687 mutex_lock(&dev->mode_config.idr_mutex); 688 689 if (lessee->lessor == NULL) 690 /* owner can use all objects */ 691 object_idr = &lessee->dev->mode_config.object_idr; 692 else 693 /* lessee can only use allowed object */ 694 object_idr = &lessee->leases; 695 696 count = 0; 697 idr_for_each_entry(object_idr, entry, object) { 698 if (count_objects > count) { 699 DRM_DEBUG_LEASE("adding object %d\n", object); 700 ret = put_user(object, object_ids + count); 701 if (ret) 702 break; 703 } 704 count++; 705 } 706 707 DRM_DEBUG("lease holds %d objects\n", count); 708 if (ret == 0) 709 arg->count_objects = count; 710 711 mutex_unlock(&dev->mode_config.idr_mutex); 712 713 return ret; 714 } 715 716 /** 717 * drm_mode_revoke_lease_ioctl - revoke lease 718 * @dev: the drm device 719 * @data: pointer to struct drm_mode_revoke_lease 720 * @lessor_priv: the file being manipulated 721 * 722 * This removes all of the objects from the lease without 723 * actually getting rid of the lease itself; that way all 724 * references to it still work correctly 725 */ 726 int drm_mode_revoke_lease_ioctl(struct drm_device *dev, 727 void *data, struct drm_file *lessor_priv) 728 { 729 struct drm_mode_revoke_lease *arg = data; 730 struct drm_master *lessor = lessor_priv->master; 731 struct drm_master *lessee; 732 int ret = 0; 733 734 DRM_DEBUG_LEASE("revoke lease for %d\n", arg->lessee_id); 735 736 /* Can't lease without MODESET */ 737 if (!drm_core_check_feature(dev, DRIVER_MODESET)) 738 return -EOPNOTSUPP; 739 740 mutex_lock(&dev->mode_config.idr_mutex); 741 742 lessee = _drm_find_lessee(lessor, arg->lessee_id); 743 744 /* No such lessee */ 745 if (!lessee) { 746 ret = -ENOENT; 747 goto fail; 748 } 749 750 /* Lease is not held by lessor */ 751 if (lessee->lessor != lessor) { 752 ret = -EACCES; 753 goto fail; 754 } 755 756 _drm_lease_revoke(lessee); 757 758 fail: 759 mutex_unlock(&dev->mode_config.idr_mutex); 760 761 return ret; 762 } 763