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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"
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68
69#define drm_for_each_lessee(lessee, lessor) \
70 list_for_each_entry((lessee), &(lessor)->lessees, lessee_list)
71
72static uint64_t drm_lease_idr_object;
73
74struct drm_master *drm_lease_owner(struct drm_master *master)
75{
76 while (master->lessor != NULL)
77 master = master->lessor;
78 return master;
79}
80
81static 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 return idr_find(&drm_lease_owner(master)->lessee_idr, lessee_id);
86}
87
88static int _drm_lease_held_master(struct drm_master *master, int id)
89{
90 lockdep_assert_held(&master->dev->mode_config.idr_mutex);
91 if (master->lessor)
92 return idr_find(&master->leases, id) != NULL;
93 return true;
94}
95
96
97static 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 drm_for_each_lessee(lessee, master)
103 if (_drm_lease_held_master(lessee, id))
104 return true;
105 return false;
106}
107
108
109bool _drm_lease_held(struct drm_file *file_priv, int id)
110{
111 bool ret;
112 struct drm_master *master;
113
114 if (!file_priv)
115 return true;
116
117 master = drm_file_get_master(file_priv);
118 if (!master)
119 return true;
120 ret = _drm_lease_held_master(master, id);
121 drm_master_put(&master);
122
123 return ret;
124}
125
126bool drm_lease_held(struct drm_file *file_priv, int id)
127{
128 struct drm_master *master;
129 bool ret;
130
131 if (!file_priv)
132 return true;
133
134 master = drm_file_get_master(file_priv);
135 if (!master)
136 return true;
137 if (!master->lessor) {
138 ret = true;
139 goto out;
140 }
141 mutex_lock(&master->dev->mode_config.idr_mutex);
142 ret = _drm_lease_held_master(master, id);
143 mutex_unlock(&master->dev->mode_config.idr_mutex);
144
145out:
146 drm_master_put(&master);
147 return ret;
148}
149
150
151
152
153
154uint32_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)
163 return crtcs_in;
164
165 master = drm_file_get_master(file_priv);
166 if (!master)
167 return crtcs_in;
168 if (!master->lessor) {
169 crtcs_out = crtcs_in;
170 goto out;
171 }
172 dev = master->dev;
173
174 count_in = count_out = 0;
175 mutex_lock(&master->dev->mode_config.idr_mutex);
176 list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
177 if (_drm_lease_held_master(master, crtc->base.id)) {
178 uint32_t mask_in = 1ul << count_in;
179
180 if ((crtcs_in & mask_in) != 0) {
181 uint32_t mask_out = 1ul << count_out;
182
183 crtcs_out |= mask_out;
184 }
185 count_out++;
186 }
187 count_in++;
188 }
189 mutex_unlock(&master->dev->mode_config.idr_mutex);
190
191out:
192 drm_master_put(&master);
193 return crtcs_out;
194}
195
196
197
198
199
200
201
202
203
204
205
206
207static struct drm_master *drm_lease_create(struct drm_master *lessor, struct idr *leases)
208{
209 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 DRM_DEBUG_LEASE("lessor %d\n", lessor->lessee_id);
217
218 lessee = drm_master_create(lessor->dev);
219 if (!lessee) {
220 DRM_DEBUG_LEASE("drm_master_create failed\n");
221 return ERR_PTR(-ENOMEM);
222 }
223
224 mutex_lock(&dev->mode_config.idr_mutex);
225
226 idr_for_each_entry(leases, entry, object) {
227 error = 0;
228 if (!idr_find(&dev->mode_config.object_idr, object))
229 error = -ENOENT;
230 else if (_drm_has_leased(lessor, object))
231 error = -EBUSY;
232
233 if (error != 0) {
234 DRM_DEBUG_LEASE("object %d failed %d\n", object, error);
235 goto out_lessee;
236 }
237 }
238
239
240 id = idr_alloc(&(drm_lease_owner(lessor)->lessee_idr), lessee, 1, 0, GFP_KERNEL);
241 if (id < 0) {
242 error = id;
243 goto out_lessee;
244 }
245
246 lessee->lessee_id = id;
247 lessee->lessor = drm_master_get(lessor);
248 list_add_tail(&lessee->lessee_list, &lessor->lessees);
249
250
251 lessee->leases = *leases;
252 DRM_DEBUG_LEASE("new lessee %d %p, lessor %d %p\n", lessee->lessee_id, lessee, lessor->lessee_id, lessor);
253
254 mutex_unlock(&dev->mode_config.idr_mutex);
255 return lessee;
256
257out_lessee:
258 mutex_unlock(&dev->mode_config.idr_mutex);
259
260 drm_master_put(&lessee);
261
262 return ERR_PTR(error);
263}
264
265void drm_lease_destroy(struct drm_master *master)
266{
267 struct drm_device *dev = master->dev;
268
269 mutex_lock(&dev->mode_config.idr_mutex);
270
271 DRM_DEBUG_LEASE("drm_lease_destroy %d\n", master->lessee_id);
272
273
274
275
276 WARN_ON(!list_empty(&master->lessees));
277
278
279 if (master->lessee_id != 0) {
280 DRM_DEBUG_LEASE("remove master %d from device list of lessees\n", master->lessee_id);
281 idr_remove(&(drm_lease_owner(master)->lessee_idr), master->lessee_id);
282 }
283
284
285 list_del(&master->lessee_list);
286
287 mutex_unlock(&dev->mode_config.idr_mutex);
288
289 if (master->lessor) {
290
291 drm_sysfs_lease_event(dev);
292 drm_master_put(&master->lessor);
293 }
294
295 DRM_DEBUG_LEASE("drm_lease_destroy done %d\n", master->lessee_id);
296}
297
298static void _drm_lease_revoke(struct drm_master *top)
299{
300 int object;
301 void *entry;
302 struct drm_master *master = top;
303
304 lockdep_assert_held(&top->dev->mode_config.idr_mutex);
305
306
307
308
309
310 for (;;) {
311 DRM_DEBUG_LEASE("revoke leases for %p %d\n", master, master->lessee_id);
312
313
314 idr_for_each_entry(&master->leases, entry, object)
315 idr_remove(&master->leases, object);
316
317
318
319
320 if (!list_empty(&master->lessees)) {
321 master = list_first_entry(&master->lessees, struct drm_master, lessee_list);
322 } else {
323
324 while (master != top && master == list_last_entry(&master->lessor->lessees, struct drm_master, lessee_list))
325 master = master->lessor;
326
327 if (master == top)
328 break;
329
330
331 master = list_next_entry(master, lessee_list);
332 }
333 }
334}
335
336void drm_lease_revoke(struct drm_master *top)
337{
338 mutex_lock(&top->dev->mode_config.idr_mutex);
339 _drm_lease_revoke(top);
340 mutex_unlock(&top->dev->mode_config.idr_mutex);
341}
342
343static 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 int has_crtc = -1;
350 int has_connector = -1;
351 int has_plane = -1;
352
353
354
355
356 for (o = 0; o < object_count; o++) {
357 if (objects[o]->type == DRM_MODE_OBJECT_CRTC && has_crtc == -1) {
358 has_crtc = o;
359 }
360 if (objects[o]->type == DRM_MODE_OBJECT_CONNECTOR && has_connector == -1)
361 has_connector = o;
362
363 if (universal_planes) {
364 if (objects[o]->type == DRM_MODE_OBJECT_PLANE && has_plane == -1)
365 has_plane = o;
366 }
367 }
368 if (has_crtc == -1 || has_connector == -1)
369 return -EINVAL;
370 if (universal_planes && has_plane == -1)
371 return -EINVAL;
372 return 0;
373}
374
375static 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 bool universal_planes = READ_ONCE(lessor_priv->universal_planes);
385
386 objects = kcalloc(object_count, sizeof(struct drm_mode_object *),
387 GFP_KERNEL);
388 if (!objects)
389 return -ENOMEM;
390
391
392
393 for (o = 0; o < object_count; o++) {
394 objects[o] = drm_mode_object_find(dev, lessor_priv,
395 object_ids[o],
396 DRM_MODE_OBJECT_ANY);
397 if (!objects[o]) {
398 ret = -ENOENT;
399 goto out_free_objects;
400 }
401
402 if (!drm_mode_object_lease_required(objects[o]->type)) {
403 DRM_DEBUG_KMS("invalid object for lease\n");
404 ret = -EINVAL;
405 goto out_free_objects;
406 }
407 }
408
409 ret = validate_lease(dev, object_count, objects, universal_planes);
410 if (ret) {
411 DRM_DEBUG_LEASE("lease validation failed\n");
412 goto out_free_objects;
413 }
414
415
416
417 for (o = 0; o < object_count; o++) {
418 struct drm_mode_object *obj = objects[o];
419 u32 object_id = objects[o]->id;
420
421 DRM_DEBUG_LEASE("Adding object %d to lease\n", object_id);
422
423
424
425
426
427
428
429
430
431 ret = idr_alloc(leases, &drm_lease_idr_object , object_id, object_id + 1, GFP_KERNEL);
432 if (ret < 0) {
433 DRM_DEBUG_LEASE("Object %d cannot be inserted into leases (%d)\n",
434 object_id, ret);
435 goto out_free_objects;
436 }
437 if (obj->type == DRM_MODE_OBJECT_CRTC && !universal_planes) {
438 struct drm_crtc *crtc = obj_to_crtc(obj);
439
440 ret = idr_alloc(leases, &drm_lease_idr_object, crtc->primary->base.id, crtc->primary->base.id + 1, GFP_KERNEL);
441 if (ret < 0) {
442 DRM_DEBUG_LEASE("Object primary plane %d cannot be inserted into leases (%d)\n",
443 object_id, ret);
444 goto out_free_objects;
445 }
446 if (crtc->cursor) {
447 ret = idr_alloc(leases, &drm_lease_idr_object, crtc->cursor->base.id, crtc->cursor->base.id + 1, GFP_KERNEL);
448 if (ret < 0) {
449 DRM_DEBUG_LEASE("Object cursor plane %d cannot be inserted into leases (%d)\n",
450 object_id, ret);
451 goto out_free_objects;
452 }
453 }
454 }
455 }
456
457 ret = 0;
458out_free_objects:
459 for (o = 0; o < object_count; o++) {
460 if (objects[o])
461 drm_mode_object_put(objects[o]);
462 }
463 kfree(objects);
464 return ret;
465}
466
467
468
469
470
471
472
473int drm_mode_create_lease_ioctl(struct drm_device *dev,
474 void *data, struct drm_file *lessor_priv)
475{
476 struct drm_mode_create_lease *cl = data;
477 size_t object_count;
478 int ret = 0;
479 struct idr leases;
480 struct drm_master *lessor;
481 struct drm_master *lessee = NULL;
482 struct file *lessee_file = NULL;
483 struct file *lessor_file = lessor_priv->filp;
484 struct drm_file *lessee_priv;
485 int fd = -1;
486 uint32_t *object_ids;
487
488
489 if (!drm_core_check_feature(dev, DRIVER_MODESET))
490 return -EOPNOTSUPP;
491
492
493 if (cl->object_count == 0) {
494 DRM_DEBUG_LEASE("no objects in lease\n");
495 return -EINVAL;
496 }
497
498 if (cl->flags && (cl->flags & ~(O_CLOEXEC | O_NONBLOCK))) {
499 DRM_DEBUG_LEASE("invalid flags\n");
500 return -EINVAL;
501 }
502
503 lessor = drm_file_get_master(lessor_priv);
504
505 if (lessor->lessor) {
506 DRM_DEBUG_LEASE("recursive leasing not allowed\n");
507 ret = -EINVAL;
508 goto out_lessor;
509 }
510
511 object_count = cl->object_count;
512
513 object_ids = memdup_user(u64_to_user_ptr(cl->object_ids),
514 array_size(object_count, sizeof(__u32)));
515 if (IS_ERR(object_ids)) {
516 ret = PTR_ERR(object_ids);
517 goto out_lessor;
518 }
519
520 idr_init(&leases);
521
522
523 ret = fill_object_idr(dev, lessor_priv, &leases,
524 object_count, object_ids);
525 kfree(object_ids);
526 if (ret) {
527 DRM_DEBUG_LEASE("lease object lookup failed: %i\n", ret);
528 idr_destroy(&leases);
529 goto out_lessor;
530 }
531
532
533 fd = get_unused_fd_flags(cl->flags & (O_CLOEXEC | O_NONBLOCK));
534 if (fd < 0) {
535 idr_destroy(&leases);
536 ret = fd;
537 goto out_lessor;
538 }
539
540 DRM_DEBUG_LEASE("Creating lease\n");
541
542 lessee = drm_lease_create(lessor, &leases);
543
544 if (IS_ERR(lessee)) {
545 ret = PTR_ERR(lessee);
546 idr_destroy(&leases);
547 goto out_leases;
548 }
549
550
551 DRM_DEBUG_LEASE("Allocating lease file\n");
552 lessee_file = file_clone_open(lessor_file);
553 if (IS_ERR(lessee_file)) {
554 ret = PTR_ERR(lessee_file);
555 goto out_lessee;
556 }
557
558 lessee_priv = lessee_file->private_data;
559
560 drm_master_put(&lessee_priv->master);
561 lessee_priv->master = lessee;
562 lessee_priv->is_master = 1;
563 lessee_priv->authenticated = 1;
564
565
566 DRM_DEBUG_LEASE("Returning fd %d id %d\n", fd, lessee->lessee_id);
567 cl->fd = fd;
568 cl->lessee_id = lessee->lessee_id;
569
570
571 fd_install(fd, lessee_file);
572
573 drm_master_put(&lessor);
574 DRM_DEBUG_LEASE("drm_mode_create_lease_ioctl succeeded\n");
575 return 0;
576
577out_lessee:
578 drm_master_put(&lessee);
579
580out_leases:
581 put_unused_fd(fd);
582
583out_lessor:
584 drm_master_put(&lessor);
585 DRM_DEBUG_LEASE("drm_mode_create_lease_ioctl failed: %d\n", ret);
586 return ret;
587}
588
589int drm_mode_list_lessees_ioctl(struct drm_device *dev,
590 void *data, struct drm_file *lessor_priv)
591{
592 struct drm_mode_list_lessees *arg = data;
593 __u32 __user *lessee_ids = (__u32 __user *) (uintptr_t) (arg->lessees_ptr);
594 __u32 count_lessees = arg->count_lessees;
595 struct drm_master *lessor, *lessee;
596 int count;
597 int ret = 0;
598
599 if (arg->pad)
600 return -EINVAL;
601
602
603 if (!drm_core_check_feature(dev, DRIVER_MODESET))
604 return -EOPNOTSUPP;
605
606 lessor = drm_file_get_master(lessor_priv);
607 DRM_DEBUG_LEASE("List lessees for %d\n", lessor->lessee_id);
608
609 mutex_lock(&dev->mode_config.idr_mutex);
610
611 count = 0;
612 drm_for_each_lessee(lessee, lessor) {
613
614 if (!idr_is_empty(&lessee->leases)) {
615 if (count_lessees > count) {
616 DRM_DEBUG_LEASE("Add lessee %d\n", lessee->lessee_id);
617 ret = put_user(lessee->lessee_id, lessee_ids + count);
618 if (ret)
619 break;
620 }
621 count++;
622 }
623 }
624
625 DRM_DEBUG_LEASE("Lessor leases to %d\n", count);
626 if (ret == 0)
627 arg->count_lessees = count;
628
629 mutex_unlock(&dev->mode_config.idr_mutex);
630 drm_master_put(&lessor);
631
632 return ret;
633}
634
635
636int drm_mode_get_lease_ioctl(struct drm_device *dev,
637 void *data, struct drm_file *lessee_priv)
638{
639 struct drm_mode_get_lease *arg = data;
640 __u32 __user *object_ids = (__u32 __user *) (uintptr_t) (arg->objects_ptr);
641 __u32 count_objects = arg->count_objects;
642 struct drm_master *lessee;
643 struct idr *object_idr;
644 int count;
645 void *entry;
646 int object;
647 int ret = 0;
648
649 if (arg->pad)
650 return -EINVAL;
651
652
653 if (!drm_core_check_feature(dev, DRIVER_MODESET))
654 return -EOPNOTSUPP;
655
656 lessee = drm_file_get_master(lessee_priv);
657 DRM_DEBUG_LEASE("get lease for %d\n", lessee->lessee_id);
658
659 mutex_lock(&dev->mode_config.idr_mutex);
660
661 if (lessee->lessor == NULL)
662
663 object_idr = &lessee->dev->mode_config.object_idr;
664 else
665
666 object_idr = &lessee->leases;
667
668 count = 0;
669 idr_for_each_entry(object_idr, entry, object) {
670 if (count_objects > count) {
671 DRM_DEBUG_LEASE("adding object %d\n", object);
672 ret = put_user(object, object_ids + count);
673 if (ret)
674 break;
675 }
676 count++;
677 }
678
679 DRM_DEBUG("lease holds %d objects\n", count);
680 if (ret == 0)
681 arg->count_objects = count;
682
683 mutex_unlock(&dev->mode_config.idr_mutex);
684 drm_master_put(&lessee);
685
686 return ret;
687}
688
689
690
691
692
693
694int drm_mode_revoke_lease_ioctl(struct drm_device *dev,
695 void *data, struct drm_file *lessor_priv)
696{
697 struct drm_mode_revoke_lease *arg = data;
698 struct drm_master *lessor;
699 struct drm_master *lessee;
700 int ret = 0;
701
702 DRM_DEBUG_LEASE("revoke lease for %d\n", arg->lessee_id);
703
704
705 if (!drm_core_check_feature(dev, DRIVER_MODESET))
706 return -EOPNOTSUPP;
707
708 lessor = drm_file_get_master(lessor_priv);
709 mutex_lock(&dev->mode_config.idr_mutex);
710
711 lessee = _drm_find_lessee(lessor, arg->lessee_id);
712
713
714 if (!lessee) {
715 ret = -ENOENT;
716 goto fail;
717 }
718
719
720 if (lessee->lessor != lessor) {
721 ret = -EACCES;
722 goto fail;
723 }
724
725 _drm_lease_revoke(lessee);
726
727fail:
728 mutex_unlock(&dev->mode_config.idr_mutex);
729 drm_master_put(&lessor);
730
731 return ret;
732}
733