Line data Source code
1 : // SPDX-License-Identifier: GPL-2.0-or-later
2 : /*
3 : * Copyright © 2017 Keith Packard <keithp@keithp.com>
4 : */
5 : #include <linux/file.h>
6 : #include <linux/uaccess.h>
7 :
8 : #include <drm/drm_auth.h>
9 : #include <drm/drm_crtc_helper.h>
10 : #include <drm/drm_drv.h>
11 : #include <drm/drm_file.h>
12 : #include <drm/drm_lease.h>
13 : #include <drm/drm_print.h>
14 :
15 : #include "drm_crtc_internal.h"
16 : #include "drm_internal.h"
17 :
18 : /**
19 : * DOC: drm leasing
20 : *
21 : * DRM leases provide information about whether a DRM master may control a DRM
22 : * mode setting object. This enables the creation of multiple DRM masters that
23 : * manage subsets of display resources.
24 : *
25 : * The original DRM master of a device 'owns' the available drm resources. It
26 : * may create additional DRM masters and 'lease' resources which it controls
27 : * to the new DRM master. This gives the new DRM master control over the
28 : * leased resources until the owner revokes the lease, or the new DRM master
29 : * is closed. Some helpful terminology:
30 : *
31 : * - An 'owner' is a &struct drm_master that is not leasing objects from
32 : * another &struct drm_master, and hence 'owns' the objects. The owner can be
33 : * identified as the &struct drm_master for which &drm_master.lessor is NULL.
34 : *
35 : * - A 'lessor' is a &struct drm_master which is leasing objects to one or more
36 : * other &struct drm_master. Currently, lessees are not allowed to
37 : * create sub-leases, hence the lessor is the same as the owner.
38 : *
39 : * - A 'lessee' is a &struct drm_master which is leasing objects from some
40 : * other &struct drm_master. Each lessee only leases resources from a single
41 : * lessor recorded in &drm_master.lessor, and holds the set of objects that
42 : * it is leasing in &drm_master.leases.
43 : *
44 : * - A 'lease' is a contract between the lessor and lessee that identifies
45 : * which resources may be controlled by the lessee. All of the resources
46 : * that are leased must be owned by or leased to the lessor, and lessors are
47 : * not permitted to lease the same object to multiple lessees.
48 : *
49 : * The set of objects any &struct drm_master 'controls' is limited to the set
50 : * of objects it leases (for lessees) or all objects (for owners).
51 : *
52 : * Objects not controlled by a &struct drm_master cannot be modified through
53 : * the various state manipulating ioctls, and any state reported back to user
54 : * space will be edited to make them appear idle and/or unusable. For
55 : * instance, connectors always report 'disconnected', while encoders
56 : * report no possible crtcs or clones.
57 : *
58 : * Since each lessee may lease objects from a single lessor, display resource
59 : * leases form a tree of &struct drm_master. As lessees are currently not
60 : * allowed to create sub-leases, the tree depth is limited to 1. All of
61 : * these get activated simultaneously when the top level device owner changes
62 : * through the SETMASTER or DROPMASTER IOCTL, so &drm_device.master points to
63 : * the owner at the top of the lease tree (i.e. the &struct drm_master for which
64 : * &drm_master.lessor is NULL). The full list of lessees that are leasing
65 : * objects from the owner can be searched via the owner's
66 : * &drm_master.lessee_idr.
67 : */
68 :
69 : #define drm_for_each_lessee(lessee, lessor) \
70 : list_for_each_entry((lessee), &(lessor)->lessees, lessee_list)
71 :
72 : static uint64_t drm_lease_idr_object;
73 :
74 0 : struct drm_master *drm_lease_owner(struct drm_master *master)
75 : {
76 0 : while (master->lessor != NULL)
77 : master = master->lessor;
78 0 : return master;
79 : }
80 :
81 : static struct drm_master*
82 : _drm_find_lessee(struct drm_master *master, int lessee_id)
83 : {
84 : lockdep_assert_held(&master->dev->mode_config.idr_mutex);
85 0 : return idr_find(&drm_lease_owner(master)->lessee_idr, lessee_id);
86 : }
87 :
88 : static int _drm_lease_held_master(struct drm_master *master, int id)
89 : {
90 : lockdep_assert_held(&master->dev->mode_config.idr_mutex);
91 0 : if (master->lessor)
92 0 : return idr_find(&master->leases, id) != NULL;
93 : return true;
94 : }
95 :
96 : /* Checks if the given object has been leased to some lessee of drm_master */
97 0 : static bool _drm_has_leased(struct drm_master *master, int id)
98 : {
99 : struct drm_master *lessee;
100 :
101 : lockdep_assert_held(&master->dev->mode_config.idr_mutex);
102 0 : drm_for_each_lessee(lessee, master)
103 0 : if (_drm_lease_held_master(lessee, id))
104 : return true;
105 : return false;
106 : }
107 :
108 : /* Called with idr_mutex held */
109 0 : bool _drm_lease_held(struct drm_file *file_priv, int id)
110 : {
111 : bool ret;
112 : struct drm_master *master;
113 :
114 0 : if (!file_priv)
115 : return true;
116 :
117 0 : master = drm_file_get_master(file_priv);
118 0 : if (!master)
119 : return true;
120 0 : ret = _drm_lease_held_master(master, id);
121 0 : drm_master_put(&master);
122 :
123 0 : return ret;
124 : }
125 :
126 0 : bool drm_lease_held(struct drm_file *file_priv, int id)
127 : {
128 : struct drm_master *master;
129 : bool ret;
130 :
131 0 : if (!file_priv)
132 : return true;
133 :
134 0 : master = drm_file_get_master(file_priv);
135 0 : if (!master)
136 : return true;
137 0 : if (!master->lessor) {
138 : ret = true;
139 : goto out;
140 : }
141 0 : mutex_lock(&master->dev->mode_config.idr_mutex);
142 0 : ret = _drm_lease_held_master(master, id);
143 0 : mutex_unlock(&master->dev->mode_config.idr_mutex);
144 :
145 : out:
146 0 : drm_master_put(&master);
147 0 : return ret;
148 : }
149 :
150 : /*
151 : * Given a bitmask of crtcs to check, reconstructs a crtc mask based on the
152 : * crtcs which are visible through the specified file.
153 : */
154 0 : 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 0 : uint32_t crtcs_out = 0;
161 :
162 0 : if (!file_priv)
163 : return crtcs_in;
164 :
165 0 : master = drm_file_get_master(file_priv);
166 0 : if (!master)
167 : return crtcs_in;
168 0 : if (!master->lessor) {
169 : crtcs_out = crtcs_in;
170 : goto out;
171 : }
172 0 : dev = master->dev;
173 :
174 0 : count_in = count_out = 0;
175 0 : mutex_lock(&master->dev->mode_config.idr_mutex);
176 0 : list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
177 0 : if (_drm_lease_held_master(master, crtc->base.id)) {
178 0 : uint32_t mask_in = 1ul << count_in;
179 :
180 0 : if ((crtcs_in & mask_in) != 0) {
181 0 : uint32_t mask_out = 1ul << count_out;
182 :
183 0 : crtcs_out |= mask_out;
184 : }
185 0 : count_out++;
186 : }
187 0 : count_in++;
188 : }
189 0 : mutex_unlock(&master->dev->mode_config.idr_mutex);
190 :
191 : out:
192 0 : drm_master_put(&master);
193 0 : return crtcs_out;
194 : }
195 :
196 : /*
197 : * Uses drm_master_create to allocate a new drm_master, then checks to
198 : * make sure all of the desired objects can be leased, atomically
199 : * leasing them to the new drmmaster.
200 : *
201 : * ERR_PTR(-EACCES) some other master holds the title to any object
202 : * ERR_PTR(-ENOENT) some object is not a valid DRM object for this device
203 : * ERR_PTR(-EBUSY) some other lessee holds title to this object
204 : * ERR_PTR(-EEXIST) same object specified more than once in the provided list
205 : * ERR_PTR(-ENOMEM) allocation failed
206 : */
207 0 : static struct drm_master *drm_lease_create(struct drm_master *lessor, struct idr *leases)
208 : {
209 0 : struct drm_device *dev = lessor->dev;
210 : int error;
211 : struct drm_master *lessee;
212 : int object;
213 : int id;
214 : void *entry;
215 :
216 0 : DRM_DEBUG_LEASE("lessor %d\n", lessor->lessee_id);
217 :
218 0 : lessee = drm_master_create(lessor->dev);
219 0 : if (!lessee) {
220 0 : DRM_DEBUG_LEASE("drm_master_create failed\n");
221 0 : return ERR_PTR(-ENOMEM);
222 : }
223 :
224 0 : mutex_lock(&dev->mode_config.idr_mutex);
225 :
226 0 : idr_for_each_entry(leases, entry, object) {
227 0 : error = 0;
228 0 : if (!idr_find(&dev->mode_config.object_idr, object))
229 : error = -ENOENT;
230 0 : else if (_drm_has_leased(lessor, object))
231 0 : error = -EBUSY;
232 :
233 0 : if (error != 0) {
234 0 : DRM_DEBUG_LEASE("object %d failed %d\n", object, error);
235 0 : goto out_lessee;
236 : }
237 : }
238 :
239 : /* Insert the new lessee into the tree */
240 0 : id = idr_alloc(&(drm_lease_owner(lessor)->lessee_idr), lessee, 1, 0, GFP_KERNEL);
241 0 : if (id < 0) {
242 : error = id;
243 : goto out_lessee;
244 : }
245 :
246 0 : lessee->lessee_id = id;
247 0 : lessee->lessor = drm_master_get(lessor);
248 0 : list_add_tail(&lessee->lessee_list, &lessor->lessees);
249 :
250 : /* Move the leases over */
251 0 : lessee->leases = *leases;
252 0 : DRM_DEBUG_LEASE("new lessee %d %p, lessor %d %p\n", lessee->lessee_id, lessee, lessor->lessee_id, lessor);
253 :
254 0 : mutex_unlock(&dev->mode_config.idr_mutex);
255 0 : return lessee;
256 :
257 : out_lessee:
258 0 : mutex_unlock(&dev->mode_config.idr_mutex);
259 :
260 0 : drm_master_put(&lessee);
261 :
262 0 : return ERR_PTR(error);
263 : }
264 :
265 0 : void drm_lease_destroy(struct drm_master *master)
266 : {
267 0 : struct drm_device *dev = master->dev;
268 :
269 0 : mutex_lock(&dev->mode_config.idr_mutex);
270 :
271 0 : DRM_DEBUG_LEASE("drm_lease_destroy %d\n", master->lessee_id);
272 :
273 : /* This master is referenced by all lessees, hence it cannot be destroyed
274 : * until all of them have been
275 : */
276 0 : WARN_ON(!list_empty(&master->lessees));
277 :
278 : /* Remove this master from the lessee idr in the owner */
279 0 : if (master->lessee_id != 0) {
280 0 : DRM_DEBUG_LEASE("remove master %d from device list of lessees\n", master->lessee_id);
281 0 : idr_remove(&(drm_lease_owner(master)->lessee_idr), master->lessee_id);
282 : }
283 :
284 : /* Remove this master from any lessee list it may be on */
285 0 : list_del(&master->lessee_list);
286 :
287 0 : mutex_unlock(&dev->mode_config.idr_mutex);
288 :
289 0 : if (master->lessor) {
290 : /* Tell the master to check the lessee list */
291 0 : drm_sysfs_lease_event(dev);
292 0 : drm_master_put(&master->lessor);
293 : }
294 :
295 0 : DRM_DEBUG_LEASE("drm_lease_destroy done %d\n", master->lessee_id);
296 0 : }
297 :
298 0 : static void _drm_lease_revoke(struct drm_master *top)
299 : {
300 : int object;
301 : void *entry;
302 0 : struct drm_master *master = top;
303 :
304 : lockdep_assert_held(&top->dev->mode_config.idr_mutex);
305 :
306 : /*
307 : * Walk the tree starting at 'top' emptying all leases. Because
308 : * the tree is fully connected, we can do this without recursing
309 : */
310 : for (;;) {
311 0 : DRM_DEBUG_LEASE("revoke leases for %p %d\n", master, master->lessee_id);
312 :
313 : /* Evacuate the lease */
314 0 : idr_for_each_entry(&master->leases, entry, object)
315 0 : idr_remove(&master->leases, object);
316 :
317 : /* Depth-first list walk */
318 :
319 : /* Down */
320 0 : if (!list_empty(&master->lessees)) {
321 0 : master = list_first_entry(&master->lessees, struct drm_master, lessee_list);
322 : } else {
323 : /* Up */
324 0 : while (master != top && master == list_last_entry(&master->lessor->lessees, struct drm_master, lessee_list))
325 : master = master->lessor;
326 :
327 0 : if (master == top)
328 : break;
329 :
330 : /* Over */
331 0 : master = list_next_entry(master, lessee_list);
332 : }
333 : }
334 0 : }
335 :
336 0 : void drm_lease_revoke(struct drm_master *top)
337 : {
338 0 : mutex_lock(&top->dev->mode_config.idr_mutex);
339 0 : _drm_lease_revoke(top);
340 0 : mutex_unlock(&top->dev->mode_config.idr_mutex);
341 0 : }
342 :
343 0 : static int validate_lease(struct drm_device *dev,
344 : int object_count,
345 : struct drm_mode_object **objects,
346 : bool universal_planes)
347 : {
348 : int o;
349 0 : int has_crtc = -1;
350 0 : int has_connector = -1;
351 0 : int has_plane = -1;
352 :
353 : /* we want to confirm that there is at least one crtc, plane
354 : connector object. */
355 :
356 0 : for (o = 0; o < object_count; o++) {
357 0 : if (objects[o]->type == DRM_MODE_OBJECT_CRTC && has_crtc == -1) {
358 0 : has_crtc = o;
359 : }
360 0 : if (objects[o]->type == DRM_MODE_OBJECT_CONNECTOR && has_connector == -1)
361 0 : has_connector = o;
362 :
363 0 : if (universal_planes) {
364 0 : if (objects[o]->type == DRM_MODE_OBJECT_PLANE && has_plane == -1)
365 0 : has_plane = o;
366 : }
367 : }
368 0 : if (has_crtc == -1 || has_connector == -1)
369 : return -EINVAL;
370 0 : if (universal_planes && has_plane == -1)
371 : return -EINVAL;
372 0 : return 0;
373 : }
374 :
375 0 : static int fill_object_idr(struct drm_device *dev,
376 : struct drm_file *lessor_priv,
377 : struct idr *leases,
378 : int object_count,
379 : u32 *object_ids)
380 : {
381 : struct drm_mode_object **objects;
382 : u32 o;
383 : int ret;
384 0 : bool universal_planes = READ_ONCE(lessor_priv->universal_planes);
385 :
386 0 : objects = kcalloc(object_count, sizeof(struct drm_mode_object *),
387 : GFP_KERNEL);
388 0 : if (!objects)
389 : return -ENOMEM;
390 :
391 : /* step one - get references to all the mode objects
392 : and check for validity. */
393 0 : for (o = 0; o < object_count; o++) {
394 0 : objects[o] = drm_mode_object_find(dev, lessor_priv,
395 0 : object_ids[o],
396 : DRM_MODE_OBJECT_ANY);
397 0 : if (!objects[o]) {
398 : ret = -ENOENT;
399 : goto out_free_objects;
400 : }
401 :
402 0 : if (!drm_mode_object_lease_required(objects[o]->type)) {
403 0 : DRM_DEBUG_KMS("invalid object for lease\n");
404 0 : ret = -EINVAL;
405 0 : goto out_free_objects;
406 : }
407 : }
408 :
409 0 : ret = validate_lease(dev, object_count, objects, universal_planes);
410 0 : if (ret) {
411 0 : DRM_DEBUG_LEASE("lease validation failed\n");
412 0 : goto out_free_objects;
413 : }
414 :
415 : /* add their IDs to the lease request - taking into account
416 : universal planes */
417 0 : for (o = 0; o < object_count; o++) {
418 0 : struct drm_mode_object *obj = objects[o];
419 0 : u32 object_id = objects[o]->id;
420 :
421 0 : DRM_DEBUG_LEASE("Adding object %d to lease\n", object_id);
422 :
423 : /*
424 : * We're using an IDR to hold the set of leased
425 : * objects, but we don't need to point at the object's
426 : * data structure from the lease as the main object_idr
427 : * will be used to actually find that. Instead, all we
428 : * really want is a 'leased/not-leased' result, for
429 : * which any non-NULL pointer will work fine.
430 : */
431 0 : ret = idr_alloc(leases, &drm_lease_idr_object , object_id, object_id + 1, GFP_KERNEL);
432 0 : if (ret < 0) {
433 0 : DRM_DEBUG_LEASE("Object %d cannot be inserted into leases (%d)\n",
434 : object_id, ret);
435 0 : goto out_free_objects;
436 : }
437 0 : if (obj->type == DRM_MODE_OBJECT_CRTC && !universal_planes) {
438 0 : struct drm_crtc *crtc = obj_to_crtc(obj);
439 :
440 0 : ret = idr_alloc(leases, &drm_lease_idr_object, crtc->primary->base.id, crtc->primary->base.id + 1, GFP_KERNEL);
441 0 : if (ret < 0) {
442 0 : DRM_DEBUG_LEASE("Object primary plane %d cannot be inserted into leases (%d)\n",
443 : object_id, ret);
444 0 : goto out_free_objects;
445 : }
446 0 : if (crtc->cursor) {
447 0 : ret = idr_alloc(leases, &drm_lease_idr_object, crtc->cursor->base.id, crtc->cursor->base.id + 1, GFP_KERNEL);
448 0 : if (ret < 0) {
449 0 : DRM_DEBUG_LEASE("Object cursor plane %d cannot be inserted into leases (%d)\n",
450 : object_id, ret);
451 0 : goto out_free_objects;
452 : }
453 : }
454 : }
455 : }
456 :
457 : ret = 0;
458 : out_free_objects:
459 0 : for (o = 0; o < object_count; o++) {
460 0 : if (objects[o])
461 0 : drm_mode_object_put(objects[o]);
462 : }
463 0 : kfree(objects);
464 0 : return ret;
465 : }
466 :
467 : /*
468 : * The master associated with the specified file will have a lease
469 : * created containing the objects specified in the ioctl structure.
470 : * A file descriptor will be allocated for that and returned to the
471 : * application.
472 : */
473 0 : int drm_mode_create_lease_ioctl(struct drm_device *dev,
474 : void *data, struct drm_file *lessor_priv)
475 : {
476 0 : struct drm_mode_create_lease *cl = data;
477 : size_t object_count;
478 0 : int ret = 0;
479 : struct idr leases;
480 : struct drm_master *lessor;
481 0 : struct drm_master *lessee = NULL;
482 0 : struct file *lessee_file = NULL;
483 0 : struct file *lessor_file = lessor_priv->filp;
484 : struct drm_file *lessee_priv;
485 0 : int fd = -1;
486 : uint32_t *object_ids;
487 :
488 : /* Can't lease without MODESET */
489 0 : if (!drm_core_check_feature(dev, DRIVER_MODESET))
490 : return -EOPNOTSUPP;
491 :
492 0 : if (cl->flags && (cl->flags & ~(O_CLOEXEC | O_NONBLOCK))) {
493 0 : DRM_DEBUG_LEASE("invalid flags\n");
494 0 : return -EINVAL;
495 : }
496 :
497 0 : lessor = drm_file_get_master(lessor_priv);
498 : /* Do not allow sub-leases */
499 0 : if (lessor->lessor) {
500 0 : DRM_DEBUG_LEASE("recursive leasing not allowed\n");
501 0 : ret = -EINVAL;
502 0 : goto out_lessor;
503 : }
504 :
505 0 : object_count = cl->object_count;
506 :
507 : /* Handle leased objects, if any */
508 0 : idr_init(&leases);
509 0 : if (object_count != 0) {
510 0 : object_ids = memdup_user(u64_to_user_ptr(cl->object_ids),
511 : array_size(object_count, sizeof(__u32)));
512 0 : if (IS_ERR(object_ids)) {
513 0 : ret = PTR_ERR(object_ids);
514 0 : idr_destroy(&leases);
515 0 : goto out_lessor;
516 : }
517 :
518 : /* fill and validate the object idr */
519 0 : ret = fill_object_idr(dev, lessor_priv, &leases,
520 : object_count, object_ids);
521 0 : kfree(object_ids);
522 0 : if (ret) {
523 0 : DRM_DEBUG_LEASE("lease object lookup failed: %i\n", ret);
524 0 : idr_destroy(&leases);
525 0 : goto out_lessor;
526 : }
527 : }
528 :
529 : /* Allocate a file descriptor for the lease */
530 0 : fd = get_unused_fd_flags(cl->flags & (O_CLOEXEC | O_NONBLOCK));
531 0 : if (fd < 0) {
532 0 : idr_destroy(&leases);
533 0 : ret = fd;
534 0 : goto out_lessor;
535 : }
536 :
537 0 : DRM_DEBUG_LEASE("Creating lease\n");
538 : /* lessee will take the ownership of leases */
539 0 : lessee = drm_lease_create(lessor, &leases);
540 :
541 0 : if (IS_ERR(lessee)) {
542 0 : ret = PTR_ERR(lessee);
543 0 : idr_destroy(&leases);
544 0 : goto out_leases;
545 : }
546 :
547 : /* Clone the lessor file to create a new file for us */
548 0 : DRM_DEBUG_LEASE("Allocating lease file\n");
549 0 : lessee_file = file_clone_open(lessor_file);
550 0 : if (IS_ERR(lessee_file)) {
551 0 : ret = PTR_ERR(lessee_file);
552 : goto out_lessee;
553 : }
554 :
555 0 : lessee_priv = lessee_file->private_data;
556 : /* Change the file to a master one */
557 0 : drm_master_put(&lessee_priv->master);
558 0 : lessee_priv->master = lessee;
559 0 : lessee_priv->is_master = 1;
560 0 : lessee_priv->authenticated = 1;
561 :
562 : /* Pass fd back to userspace */
563 0 : DRM_DEBUG_LEASE("Returning fd %d id %d\n", fd, lessee->lessee_id);
564 0 : cl->fd = fd;
565 0 : cl->lessee_id = lessee->lessee_id;
566 :
567 : /* Hook up the fd */
568 0 : fd_install(fd, lessee_file);
569 :
570 0 : drm_master_put(&lessor);
571 0 : DRM_DEBUG_LEASE("drm_mode_create_lease_ioctl succeeded\n");
572 0 : return 0;
573 :
574 : out_lessee:
575 0 : drm_master_put(&lessee);
576 :
577 : out_leases:
578 0 : put_unused_fd(fd);
579 :
580 : out_lessor:
581 0 : drm_master_put(&lessor);
582 0 : DRM_DEBUG_LEASE("drm_mode_create_lease_ioctl failed: %d\n", ret);
583 0 : return ret;
584 : }
585 :
586 0 : int drm_mode_list_lessees_ioctl(struct drm_device *dev,
587 : void *data, struct drm_file *lessor_priv)
588 : {
589 0 : struct drm_mode_list_lessees *arg = data;
590 0 : __u32 __user *lessee_ids = (__u32 __user *) (uintptr_t) (arg->lessees_ptr);
591 0 : __u32 count_lessees = arg->count_lessees;
592 : struct drm_master *lessor, *lessee;
593 : int count;
594 0 : int ret = 0;
595 :
596 0 : if (arg->pad)
597 : return -EINVAL;
598 :
599 : /* Can't lease without MODESET */
600 0 : if (!drm_core_check_feature(dev, DRIVER_MODESET))
601 : return -EOPNOTSUPP;
602 :
603 0 : lessor = drm_file_get_master(lessor_priv);
604 0 : DRM_DEBUG_LEASE("List lessees for %d\n", lessor->lessee_id);
605 :
606 0 : mutex_lock(&dev->mode_config.idr_mutex);
607 :
608 0 : count = 0;
609 0 : drm_for_each_lessee(lessee, lessor) {
610 : /* Only list un-revoked leases */
611 0 : if (!idr_is_empty(&lessee->leases)) {
612 0 : if (count_lessees > count) {
613 0 : DRM_DEBUG_LEASE("Add lessee %d\n", lessee->lessee_id);
614 0 : ret = put_user(lessee->lessee_id, lessee_ids + count);
615 0 : if (ret)
616 : break;
617 : }
618 0 : count++;
619 : }
620 : }
621 :
622 0 : DRM_DEBUG_LEASE("Lessor leases to %d\n", count);
623 0 : if (ret == 0)
624 0 : arg->count_lessees = count;
625 :
626 0 : mutex_unlock(&dev->mode_config.idr_mutex);
627 0 : drm_master_put(&lessor);
628 :
629 0 : return ret;
630 : }
631 :
632 : /* Return the list of leased objects for the specified lessee */
633 0 : int drm_mode_get_lease_ioctl(struct drm_device *dev,
634 : void *data, struct drm_file *lessee_priv)
635 : {
636 0 : struct drm_mode_get_lease *arg = data;
637 0 : __u32 __user *object_ids = (__u32 __user *) (uintptr_t) (arg->objects_ptr);
638 0 : __u32 count_objects = arg->count_objects;
639 : struct drm_master *lessee;
640 : struct idr *object_idr;
641 : int count;
642 : void *entry;
643 : int object;
644 0 : int ret = 0;
645 :
646 0 : if (arg->pad)
647 : return -EINVAL;
648 :
649 : /* Can't lease without MODESET */
650 0 : if (!drm_core_check_feature(dev, DRIVER_MODESET))
651 : return -EOPNOTSUPP;
652 :
653 0 : lessee = drm_file_get_master(lessee_priv);
654 0 : DRM_DEBUG_LEASE("get lease for %d\n", lessee->lessee_id);
655 :
656 0 : mutex_lock(&dev->mode_config.idr_mutex);
657 :
658 0 : if (lessee->lessor == NULL)
659 : /* owner can use all objects */
660 0 : object_idr = &lessee->dev->mode_config.object_idr;
661 : else
662 : /* lessee can only use allowed object */
663 0 : object_idr = &lessee->leases;
664 :
665 0 : count = 0;
666 0 : idr_for_each_entry(object_idr, entry, object) {
667 0 : if (count_objects > count) {
668 0 : DRM_DEBUG_LEASE("adding object %d\n", object);
669 0 : ret = put_user(object, object_ids + count);
670 0 : if (ret)
671 : break;
672 : }
673 0 : count++;
674 : }
675 :
676 0 : DRM_DEBUG("lease holds %d objects\n", count);
677 0 : if (ret == 0)
678 0 : arg->count_objects = count;
679 :
680 0 : mutex_unlock(&dev->mode_config.idr_mutex);
681 0 : drm_master_put(&lessee);
682 :
683 0 : return ret;
684 : }
685 :
686 : /*
687 : * This removes all of the objects from the lease without
688 : * actually getting rid of the lease itself; that way all
689 : * references to it still work correctly
690 : */
691 0 : int drm_mode_revoke_lease_ioctl(struct drm_device *dev,
692 : void *data, struct drm_file *lessor_priv)
693 : {
694 0 : struct drm_mode_revoke_lease *arg = data;
695 : struct drm_master *lessor;
696 : struct drm_master *lessee;
697 0 : int ret = 0;
698 :
699 0 : DRM_DEBUG_LEASE("revoke lease for %d\n", arg->lessee_id);
700 :
701 : /* Can't lease without MODESET */
702 0 : if (!drm_core_check_feature(dev, DRIVER_MODESET))
703 : return -EOPNOTSUPP;
704 :
705 0 : lessor = drm_file_get_master(lessor_priv);
706 0 : mutex_lock(&dev->mode_config.idr_mutex);
707 :
708 0 : lessee = _drm_find_lessee(lessor, arg->lessee_id);
709 :
710 : /* No such lessee */
711 0 : if (!lessee) {
712 : ret = -ENOENT;
713 : goto fail;
714 : }
715 :
716 : /* Lease is not held by lessor */
717 0 : if (lessee->lessor != lessor) {
718 : ret = -EACCES;
719 : goto fail;
720 : }
721 :
722 0 : _drm_lease_revoke(lessee);
723 :
724 : fail:
725 0 : mutex_unlock(&dev->mode_config.idr_mutex);
726 0 : drm_master_put(&lessor);
727 :
728 0 : return ret;
729 : }
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