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.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_dbg_lease(dev, "lessor %d\n", lessor->lessee_id);
217 :
218 0 : lessee = drm_master_create(lessor->dev);
219 0 : if (!lessee) {
220 0 : drm_dbg_lease(dev, "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_dbg_lease(dev, "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_dbg_lease(dev, "new lessee %d %p, lessor %d %p\n",
253 : lessee->lessee_id, lessee, lessor->lessee_id, lessor);
254 :
255 0 : mutex_unlock(&dev->mode_config.idr_mutex);
256 0 : return lessee;
257 :
258 : out_lessee:
259 0 : mutex_unlock(&dev->mode_config.idr_mutex);
260 :
261 0 : drm_master_put(&lessee);
262 :
263 0 : return ERR_PTR(error);
264 : }
265 :
266 0 : void drm_lease_destroy(struct drm_master *master)
267 : {
268 0 : struct drm_device *dev = master->dev;
269 :
270 0 : mutex_lock(&dev->mode_config.idr_mutex);
271 :
272 0 : drm_dbg_lease(dev, "drm_lease_destroy %d\n", master->lessee_id);
273 :
274 : /* This master is referenced by all lessees, hence it cannot be destroyed
275 : * until all of them have been
276 : */
277 0 : WARN_ON(!list_empty(&master->lessees));
278 :
279 : /* Remove this master from the lessee idr in the owner */
280 0 : if (master->lessee_id != 0) {
281 0 : drm_dbg_lease(dev, "remove master %d from device list of lessees\n",
282 : master->lessee_id);
283 0 : idr_remove(&(drm_lease_owner(master)->lessee_idr), master->lessee_id);
284 : }
285 :
286 : /* Remove this master from any lessee list it may be on */
287 0 : list_del(&master->lessee_list);
288 :
289 0 : mutex_unlock(&dev->mode_config.idr_mutex);
290 :
291 0 : if (master->lessor) {
292 : /* Tell the master to check the lessee list */
293 0 : drm_sysfs_lease_event(dev);
294 0 : drm_master_put(&master->lessor);
295 : }
296 :
297 0 : drm_dbg_lease(dev, "drm_lease_destroy done %d\n", master->lessee_id);
298 0 : }
299 :
300 0 : static void _drm_lease_revoke(struct drm_master *top)
301 : {
302 : int object;
303 : void *entry;
304 0 : struct drm_master *master = top;
305 :
306 : lockdep_assert_held(&top->dev->mode_config.idr_mutex);
307 :
308 : /*
309 : * Walk the tree starting at 'top' emptying all leases. Because
310 : * the tree is fully connected, we can do this without recursing
311 : */
312 : for (;;) {
313 0 : drm_dbg_lease(master->dev, "revoke leases for %p %d\n",
314 : master, master->lessee_id);
315 :
316 : /* Evacuate the lease */
317 0 : idr_for_each_entry(&master->leases, entry, object)
318 0 : idr_remove(&master->leases, object);
319 :
320 : /* Depth-first list walk */
321 :
322 : /* Down */
323 0 : if (!list_empty(&master->lessees)) {
324 0 : master = list_first_entry(&master->lessees, struct drm_master, lessee_list);
325 : } else {
326 : /* Up */
327 0 : while (master != top && master == list_last_entry(&master->lessor->lessees, struct drm_master, lessee_list))
328 : master = master->lessor;
329 :
330 0 : if (master == top)
331 : break;
332 :
333 : /* Over */
334 0 : master = list_next_entry(master, lessee_list);
335 : }
336 : }
337 0 : }
338 :
339 0 : void drm_lease_revoke(struct drm_master *top)
340 : {
341 0 : mutex_lock(&top->dev->mode_config.idr_mutex);
342 0 : _drm_lease_revoke(top);
343 0 : mutex_unlock(&top->dev->mode_config.idr_mutex);
344 0 : }
345 :
346 0 : static int validate_lease(struct drm_device *dev,
347 : int object_count,
348 : struct drm_mode_object **objects,
349 : bool universal_planes)
350 : {
351 : int o;
352 0 : int has_crtc = -1;
353 0 : int has_connector = -1;
354 0 : int has_plane = -1;
355 :
356 : /* we want to confirm that there is at least one crtc, plane
357 : connector object. */
358 :
359 0 : for (o = 0; o < object_count; o++) {
360 0 : if (objects[o]->type == DRM_MODE_OBJECT_CRTC && has_crtc == -1) {
361 0 : has_crtc = o;
362 : }
363 0 : if (objects[o]->type == DRM_MODE_OBJECT_CONNECTOR && has_connector == -1)
364 0 : has_connector = o;
365 :
366 0 : if (universal_planes) {
367 0 : if (objects[o]->type == DRM_MODE_OBJECT_PLANE && has_plane == -1)
368 0 : has_plane = o;
369 : }
370 : }
371 0 : if (has_crtc == -1 || has_connector == -1)
372 : return -EINVAL;
373 0 : if (universal_planes && has_plane == -1)
374 : return -EINVAL;
375 0 : return 0;
376 : }
377 :
378 0 : static int fill_object_idr(struct drm_device *dev,
379 : struct drm_file *lessor_priv,
380 : struct idr *leases,
381 : int object_count,
382 : u32 *object_ids)
383 : {
384 : struct drm_mode_object **objects;
385 : u32 o;
386 : int ret;
387 0 : bool universal_planes = READ_ONCE(lessor_priv->universal_planes);
388 :
389 0 : objects = kcalloc(object_count, sizeof(struct drm_mode_object *),
390 : GFP_KERNEL);
391 0 : if (!objects)
392 : return -ENOMEM;
393 :
394 : /* step one - get references to all the mode objects
395 : and check for validity. */
396 0 : for (o = 0; o < object_count; o++) {
397 0 : objects[o] = drm_mode_object_find(dev, lessor_priv,
398 0 : object_ids[o],
399 : DRM_MODE_OBJECT_ANY);
400 0 : if (!objects[o]) {
401 : ret = -ENOENT;
402 : goto out_free_objects;
403 : }
404 :
405 0 : if (!drm_mode_object_lease_required(objects[o]->type)) {
406 0 : DRM_DEBUG_KMS("invalid object for lease\n");
407 0 : ret = -EINVAL;
408 0 : goto out_free_objects;
409 : }
410 : }
411 :
412 0 : ret = validate_lease(dev, object_count, objects, universal_planes);
413 0 : if (ret) {
414 0 : drm_dbg_lease(dev, "lease validation failed\n");
415 0 : goto out_free_objects;
416 : }
417 :
418 : /* add their IDs to the lease request - taking into account
419 : universal planes */
420 0 : for (o = 0; o < object_count; o++) {
421 0 : struct drm_mode_object *obj = objects[o];
422 0 : u32 object_id = objects[o]->id;
423 :
424 0 : drm_dbg_lease(dev, "Adding object %d to lease\n", object_id);
425 :
426 : /*
427 : * We're using an IDR to hold the set of leased
428 : * objects, but we don't need to point at the object's
429 : * data structure from the lease as the main object_idr
430 : * will be used to actually find that. Instead, all we
431 : * really want is a 'leased/not-leased' result, for
432 : * which any non-NULL pointer will work fine.
433 : */
434 0 : ret = idr_alloc(leases, &drm_lease_idr_object , object_id, object_id + 1, GFP_KERNEL);
435 0 : if (ret < 0) {
436 0 : drm_dbg_lease(dev, "Object %d cannot be inserted into leases (%d)\n",
437 : object_id, ret);
438 0 : goto out_free_objects;
439 : }
440 0 : if (obj->type == DRM_MODE_OBJECT_CRTC && !universal_planes) {
441 0 : struct drm_crtc *crtc = obj_to_crtc(obj);
442 :
443 0 : ret = idr_alloc(leases, &drm_lease_idr_object, crtc->primary->base.id, crtc->primary->base.id + 1, GFP_KERNEL);
444 0 : if (ret < 0) {
445 0 : drm_dbg_lease(dev, "Object primary plane %d cannot be inserted into leases (%d)\n",
446 : object_id, ret);
447 0 : goto out_free_objects;
448 : }
449 0 : if (crtc->cursor) {
450 0 : ret = idr_alloc(leases, &drm_lease_idr_object, crtc->cursor->base.id, crtc->cursor->base.id + 1, GFP_KERNEL);
451 0 : if (ret < 0) {
452 0 : drm_dbg_lease(dev, "Object cursor plane %d cannot be inserted into leases (%d)\n",
453 : object_id, ret);
454 0 : goto out_free_objects;
455 : }
456 : }
457 : }
458 : }
459 :
460 : ret = 0;
461 : out_free_objects:
462 0 : for (o = 0; o < object_count; o++) {
463 0 : if (objects[o])
464 0 : drm_mode_object_put(objects[o]);
465 : }
466 0 : kfree(objects);
467 0 : return ret;
468 : }
469 :
470 : /*
471 : * The master associated with the specified file will have a lease
472 : * created containing the objects specified in the ioctl structure.
473 : * A file descriptor will be allocated for that and returned to the
474 : * application.
475 : */
476 0 : int drm_mode_create_lease_ioctl(struct drm_device *dev,
477 : void *data, struct drm_file *lessor_priv)
478 : {
479 0 : struct drm_mode_create_lease *cl = data;
480 : size_t object_count;
481 0 : int ret = 0;
482 : struct idr leases;
483 : struct drm_master *lessor;
484 0 : struct drm_master *lessee = NULL;
485 0 : struct file *lessee_file = NULL;
486 0 : struct file *lessor_file = lessor_priv->filp;
487 : struct drm_file *lessee_priv;
488 0 : int fd = -1;
489 : uint32_t *object_ids;
490 :
491 : /* Can't lease without MODESET */
492 0 : if (!drm_core_check_feature(dev, DRIVER_MODESET))
493 : return -EOPNOTSUPP;
494 :
495 0 : if (cl->flags && (cl->flags & ~(O_CLOEXEC | O_NONBLOCK))) {
496 0 : drm_dbg_lease(dev, "invalid flags\n");
497 0 : return -EINVAL;
498 : }
499 :
500 0 : lessor = drm_file_get_master(lessor_priv);
501 : /* Do not allow sub-leases */
502 0 : if (lessor->lessor) {
503 0 : drm_dbg_lease(dev, "recursive leasing not allowed\n");
504 0 : ret = -EINVAL;
505 0 : goto out_lessor;
506 : }
507 :
508 0 : object_count = cl->object_count;
509 :
510 : /* Handle leased objects, if any */
511 0 : idr_init(&leases);
512 0 : if (object_count != 0) {
513 0 : object_ids = memdup_user(u64_to_user_ptr(cl->object_ids),
514 : array_size(object_count, sizeof(__u32)));
515 0 : if (IS_ERR(object_ids)) {
516 0 : ret = PTR_ERR(object_ids);
517 0 : idr_destroy(&leases);
518 0 : goto out_lessor;
519 : }
520 :
521 : /* fill and validate the object idr */
522 0 : ret = fill_object_idr(dev, lessor_priv, &leases,
523 : object_count, object_ids);
524 0 : kfree(object_ids);
525 0 : if (ret) {
526 0 : drm_dbg_lease(dev, "lease object lookup failed: %i\n", ret);
527 0 : idr_destroy(&leases);
528 0 : goto out_lessor;
529 : }
530 : }
531 :
532 : /* Allocate a file descriptor for the lease */
533 0 : fd = get_unused_fd_flags(cl->flags & (O_CLOEXEC | O_NONBLOCK));
534 0 : if (fd < 0) {
535 0 : idr_destroy(&leases);
536 0 : ret = fd;
537 0 : goto out_lessor;
538 : }
539 :
540 0 : drm_dbg_lease(dev, "Creating lease\n");
541 : /* lessee will take the ownership of leases */
542 0 : lessee = drm_lease_create(lessor, &leases);
543 :
544 0 : if (IS_ERR(lessee)) {
545 0 : ret = PTR_ERR(lessee);
546 0 : idr_destroy(&leases);
547 0 : goto out_leases;
548 : }
549 :
550 : /* Clone the lessor file to create a new file for us */
551 0 : drm_dbg_lease(dev, "Allocating lease file\n");
552 0 : lessee_file = file_clone_open(lessor_file);
553 0 : if (IS_ERR(lessee_file)) {
554 0 : ret = PTR_ERR(lessee_file);
555 : goto out_lessee;
556 : }
557 :
558 0 : lessee_priv = lessee_file->private_data;
559 : /* Change the file to a master one */
560 0 : drm_master_put(&lessee_priv->master);
561 0 : lessee_priv->master = lessee;
562 0 : lessee_priv->is_master = 1;
563 0 : lessee_priv->authenticated = 1;
564 :
565 : /* Pass fd back to userspace */
566 0 : drm_dbg_lease(dev, "Returning fd %d id %d\n", fd, lessee->lessee_id);
567 0 : cl->fd = fd;
568 0 : cl->lessee_id = lessee->lessee_id;
569 :
570 : /* Hook up the fd */
571 0 : fd_install(fd, lessee_file);
572 :
573 0 : drm_master_put(&lessor);
574 0 : drm_dbg_lease(dev, "drm_mode_create_lease_ioctl succeeded\n");
575 0 : return 0;
576 :
577 : out_lessee:
578 0 : drm_master_put(&lessee);
579 :
580 : out_leases:
581 0 : put_unused_fd(fd);
582 :
583 : out_lessor:
584 0 : drm_master_put(&lessor);
585 0 : drm_dbg_lease(dev, "drm_mode_create_lease_ioctl failed: %d\n", ret);
586 0 : return ret;
587 : }
588 :
589 0 : int drm_mode_list_lessees_ioctl(struct drm_device *dev,
590 : void *data, struct drm_file *lessor_priv)
591 : {
592 0 : struct drm_mode_list_lessees *arg = data;
593 0 : __u32 __user *lessee_ids = (__u32 __user *) (uintptr_t) (arg->lessees_ptr);
594 0 : __u32 count_lessees = arg->count_lessees;
595 : struct drm_master *lessor, *lessee;
596 : int count;
597 0 : int ret = 0;
598 :
599 0 : if (arg->pad)
600 : return -EINVAL;
601 :
602 : /* Can't lease without MODESET */
603 0 : if (!drm_core_check_feature(dev, DRIVER_MODESET))
604 : return -EOPNOTSUPP;
605 :
606 0 : lessor = drm_file_get_master(lessor_priv);
607 0 : drm_dbg_lease(dev, "List lessees for %d\n", lessor->lessee_id);
608 :
609 0 : mutex_lock(&dev->mode_config.idr_mutex);
610 :
611 0 : count = 0;
612 0 : drm_for_each_lessee(lessee, lessor) {
613 : /* Only list un-revoked leases */
614 0 : if (!idr_is_empty(&lessee->leases)) {
615 0 : if (count_lessees > count) {
616 0 : drm_dbg_lease(dev, "Add lessee %d\n",
617 : lessee->lessee_id);
618 0 : ret = put_user(lessee->lessee_id, lessee_ids + count);
619 0 : if (ret)
620 : break;
621 : }
622 0 : count++;
623 : }
624 : }
625 :
626 0 : drm_dbg_lease(dev, "Lessor leases to %d\n", count);
627 0 : if (ret == 0)
628 0 : arg->count_lessees = count;
629 :
630 0 : mutex_unlock(&dev->mode_config.idr_mutex);
631 0 : drm_master_put(&lessor);
632 :
633 0 : return ret;
634 : }
635 :
636 : /* Return the list of leased objects for the specified lessee */
637 0 : int drm_mode_get_lease_ioctl(struct drm_device *dev,
638 : void *data, struct drm_file *lessee_priv)
639 : {
640 0 : struct drm_mode_get_lease *arg = data;
641 0 : __u32 __user *object_ids = (__u32 __user *) (uintptr_t) (arg->objects_ptr);
642 0 : __u32 count_objects = arg->count_objects;
643 : struct drm_master *lessee;
644 : struct idr *object_idr;
645 : int count;
646 : void *entry;
647 : int object;
648 0 : int ret = 0;
649 :
650 0 : if (arg->pad)
651 : return -EINVAL;
652 :
653 : /* Can't lease without MODESET */
654 0 : if (!drm_core_check_feature(dev, DRIVER_MODESET))
655 : return -EOPNOTSUPP;
656 :
657 0 : lessee = drm_file_get_master(lessee_priv);
658 0 : drm_dbg_lease(dev, "get lease for %d\n", lessee->lessee_id);
659 :
660 0 : mutex_lock(&dev->mode_config.idr_mutex);
661 :
662 0 : if (lessee->lessor == NULL)
663 : /* owner can use all objects */
664 0 : object_idr = &lessee->dev->mode_config.object_idr;
665 : else
666 : /* lessee can only use allowed object */
667 0 : object_idr = &lessee->leases;
668 :
669 0 : count = 0;
670 0 : idr_for_each_entry(object_idr, entry, object) {
671 0 : if (count_objects > count) {
672 0 : drm_dbg_lease(dev, "adding object %d\n", object);
673 0 : ret = put_user(object, object_ids + count);
674 0 : if (ret)
675 : break;
676 : }
677 0 : count++;
678 : }
679 :
680 0 : DRM_DEBUG("lease holds %d objects\n", count);
681 0 : if (ret == 0)
682 0 : arg->count_objects = count;
683 :
684 0 : mutex_unlock(&dev->mode_config.idr_mutex);
685 0 : drm_master_put(&lessee);
686 :
687 0 : return ret;
688 : }
689 :
690 : /*
691 : * This removes all of the objects from the lease without
692 : * actually getting rid of the lease itself; that way all
693 : * references to it still work correctly
694 : */
695 0 : int drm_mode_revoke_lease_ioctl(struct drm_device *dev,
696 : void *data, struct drm_file *lessor_priv)
697 : {
698 0 : struct drm_mode_revoke_lease *arg = data;
699 : struct drm_master *lessor;
700 : struct drm_master *lessee;
701 0 : int ret = 0;
702 :
703 0 : drm_dbg_lease(dev, "revoke lease for %d\n", arg->lessee_id);
704 :
705 : /* Can't lease without MODESET */
706 0 : if (!drm_core_check_feature(dev, DRIVER_MODESET))
707 : return -EOPNOTSUPP;
708 :
709 0 : lessor = drm_file_get_master(lessor_priv);
710 0 : mutex_lock(&dev->mode_config.idr_mutex);
711 :
712 0 : lessee = _drm_find_lessee(lessor, arg->lessee_id);
713 :
714 : /* No such lessee */
715 0 : if (!lessee) {
716 : ret = -ENOENT;
717 : goto fail;
718 : }
719 :
720 : /* Lease is not held by lessor */
721 0 : if (lessee->lessor != lessor) {
722 : ret = -EACCES;
723 : goto fail;
724 : }
725 :
726 0 : _drm_lease_revoke(lessee);
727 :
728 : fail:
729 0 : mutex_unlock(&dev->mode_config.idr_mutex);
730 0 : drm_master_put(&lessor);
731 :
732 0 : return ret;
733 : }
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