summaryrefslogtreecommitdiffstats
path: root/drivers/gpu/drm/drm_plane.c
blob: 62b98f386fd1e7d6a4297d3bc49991b9e542bc12 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
/*
 * Copyright (c) 2016 Intel Corporation
 *
 * Permission to use, copy, modify, distribute, and sell this software and its
 * documentation for any purpose is hereby granted without fee, provided that
 * the above copyright notice appear in all copies and that both that copyright
 * notice and this permission notice appear in supporting documentation, and
 * that the name of the copyright holders not be used in advertising or
 * publicity pertaining to distribution of the software without specific,
 * written prior permission.  The copyright holders make no representations
 * about the suitability of this software for any purpose.  It is provided "as
 * is" without express or implied warranty.
 *
 * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
 * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
 * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
 * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
 * OF THIS SOFTWARE.
 */

#include <drm/drmP.h>
#include <drm/drm_plane.h>

#include "drm_crtc_internal.h"

/**
 * DOC: overview
 *
 * A plane represents an image source that can be blended with or overlayed on
 * top of a CRTC during the scanout process. Planes take their input data from a
 * &drm_framebuffer object. The plane itself specifies the cropping and scaling
 * of that image, and where it is placed on the visible are of a display
 * pipeline, represented by &drm_crtc. A plane can also have additional
 * properties that specify how the pixels are positioned and blended, like
 * rotation or Z-position. All these properties are stored in &drm_plane_state.
 *
 * To create a plane, a KMS drivers allocates and zeroes an instances of
 * struct &drm_plane (possibly as part of a larger structure) and registers it
 * with a call to drm_universal_plane_init().
 *
 * Cursor and overlay planes are optional. All drivers should provide one
 * primary plane per CRTC to avoid surprising userspace too much. See enum
 * &drm_plane_type for a more in-depth discussion of these special uapi-relevant
 * plane types. Special planes are associated with their CRTC by calling
 * drm_crtc_init_with_planes().
 *
 * The type of a plane is exposed in the immutable "type" enumeration property,
 * which has one of the following values: "Overlay", "Primary", "Cursor".
 */

static unsigned int drm_num_planes(struct drm_device *dev)
{
	unsigned int num = 0;
	struct drm_plane *tmp;

	drm_for_each_plane(tmp, dev) {
		num++;
	}

	return num;
}

/**
 * drm_universal_plane_init - Initialize a new universal plane object
 * @dev: DRM device
 * @plane: plane object to init
 * @possible_crtcs: bitmask of possible CRTCs
 * @funcs: callbacks for the new plane
 * @formats: array of supported formats (DRM_FORMAT\_\*)
 * @format_count: number of elements in @formats
 * @type: type of plane (overlay, primary, cursor)
 * @name: printf style format string for the plane name, or NULL for default name
 *
 * Initializes a plane object of type @type.
 *
 * Returns:
 * Zero on success, error code on failure.
 */
int drm_universal_plane_init(struct drm_device *dev, struct drm_plane *plane,
			     uint32_t possible_crtcs,
			     const struct drm_plane_funcs *funcs,
			     const uint32_t *formats, unsigned int format_count,
			     enum drm_plane_type type,
			     const char *name, ...)
{
	struct drm_mode_config *config = &dev->mode_config;
	int ret;

	ret = drm_mode_object_get(dev, &plane->base, DRM_MODE_OBJECT_PLANE);
	if (ret)
		return ret;

	drm_modeset_lock_init(&plane->mutex);

	plane->base.properties = &plane->properties;
	plane->dev = dev;
	plane->funcs = funcs;
	plane->format_types = kmalloc_array(format_count, sizeof(uint32_t),
					    GFP_KERNEL);
	if (!plane->format_types) {
		DRM_DEBUG_KMS("out of memory when allocating plane\n");
		drm_mode_object_unregister(dev, &plane->base);
		return -ENOMEM;
	}

	if (name) {
		va_list ap;

		va_start(ap, name);
		plane->name = kvasprintf(GFP_KERNEL, name, ap);
		va_end(ap);
	} else {
		plane->name = kasprintf(GFP_KERNEL, "plane-%d",
					drm_num_planes(dev));
	}
	if (!plane->name) {
		kfree(plane->format_types);
		drm_mode_object_unregister(dev, &plane->base);
		return -ENOMEM;
	}

	memcpy(plane->format_types, formats, format_count * sizeof(uint32_t));
	plane->format_count = format_count;
	plane->possible_crtcs = possible_crtcs;
	plane->type = type;

	list_add_tail(&plane->head, &config->plane_list);
	plane->index = config->num_total_plane++;
	if (plane->type == DRM_PLANE_TYPE_OVERLAY)
		config->num_overlay_plane++;

	drm_object_attach_property(&plane->base,
				   config->plane_type_property,
				   plane->type);

	if (drm_core_check_feature(dev, DRIVER_ATOMIC)) {
		drm_object_attach_property(&plane->base, config->prop_fb_id, 0);
		drm_object_attach_property(&plane->base, config->prop_in_fence_fd, -1);
		drm_object_attach_property(&plane->base, config->prop_crtc_id, 0);
		drm_object_attach_property(&plane->base, config->prop_crtc_x, 0);
		drm_object_attach_property(&plane->base, config->prop_crtc_y, 0);
		drm_object_attach_property(&plane->base, config->prop_crtc_w, 0);
		drm_object_attach_property(&plane->base, config->prop_crtc_h, 0);
		drm_object_attach_property(&plane->base, config->prop_src_x, 0);
		drm_object_attach_property(&plane->base, config->prop_src_y, 0);
		drm_object_attach_property(&plane->base, config->prop_src_w, 0);
		drm_object_attach_property(&plane->base, config->prop_src_h, 0);
	}

	return 0;
}
EXPORT_SYMBOL(drm_universal_plane_init);

int drm_plane_register_all(struct drm_device *dev)
{
	struct drm_plane *plane;
	int ret = 0;

	drm_for_each_plane(plane, dev) {
		if (plane->funcs->late_register)
			ret = plane->funcs->late_register(plane);
		if (ret)
			return ret;
	}

	return 0;
}

void drm_plane_unregister_all(struct drm_device *dev)
{
	struct drm_plane *plane;

	drm_for_each_plane(plane, dev) {
		if (plane->funcs->early_unregister)
			plane->funcs->early_unregister(plane);
	}
}

/**
 * drm_plane_init - Initialize a legacy plane
 * @dev: DRM device
 * @plane: plane object to init
 * @possible_crtcs: bitmask of possible CRTCs
 * @funcs: callbacks for the new plane
 * @formats: array of supported formats (DRM_FORMAT\_\*)
 * @format_count: number of elements in @formats
 * @is_primary: plane type (primary vs overlay)
 *
 * Legacy API to initialize a DRM plane.
 *
 * New drivers should call drm_universal_plane_init() instead.
 *
 * Returns:
 * Zero on success, error code on failure.
 */
int drm_plane_init(struct drm_device *dev, struct drm_plane *plane,
		   uint32_t possible_crtcs,
		   const struct drm_plane_funcs *funcs,
		   const uint32_t *formats, unsigned int format_count,
		   bool is_primary)
{
	enum drm_plane_type type;

	type = is_primary ? DRM_PLANE_TYPE_PRIMARY : DRM_PLANE_TYPE_OVERLAY;
	return drm_universal_plane_init(dev, plane, possible_crtcs, funcs,
					formats, format_count, type, NULL);
}
EXPORT_SYMBOL(drm_plane_init);

/**
 * drm_plane_cleanup - Clean up the core plane usage
 * @plane: plane to cleanup
 *
 * This function cleans up @plane and removes it from the DRM mode setting
 * core. Note that the function does *not* free the plane structure itself,
 * this is the responsibility of the caller.
 */
void drm_plane_cleanup(struct drm_plane *plane)
{
	struct drm_device *dev = plane->dev;

	drm_modeset_lock_fini(&plane->mutex);

	kfree(plane->format_types);
	drm_mode_object_unregister(dev, &plane->base);

	BUG_ON(list_empty(&plane->head));

	/* Note that the plane_list is considered to be static; should we
	 * remove the drm_plane at runtime we would have to decrement all
	 * the indices on the drm_plane after us in the plane_list.
	 */

	list_del(&plane->head);
	dev->mode_config.num_total_plane--;
	if (plane->type == DRM_PLANE_TYPE_OVERLAY)
		dev->mode_config.num_overlay_plane--;

	WARN_ON(plane->state && !plane->funcs->atomic_destroy_state);
	if (plane->state && plane->funcs->atomic_destroy_state)
		plane->funcs->atomic_destroy_state(plane, plane->state);

	kfree(plane->name);

	memset(plane, 0, sizeof(*plane));
}
EXPORT_SYMBOL(drm_plane_cleanup);

/**
 * drm_plane_from_index - find the registered plane at an index
 * @dev: DRM device
 * @idx: index of registered plane to find for
 *
 * Given a plane index, return the registered plane from DRM device's
 * list of planes with matching index.
 */
struct drm_plane *
drm_plane_from_index(struct drm_device *dev, int idx)
{
	struct drm_plane *plane;

	drm_for_each_plane(plane, dev)
		if (idx == plane->index)
			return plane;

	return NULL;
}
EXPORT_SYMBOL(drm_plane_from_index);

/**
 * drm_plane_force_disable - Forcibly disable a plane
 * @plane: plane to disable
 *
 * Forces the plane to be disabled.
 *
 * Used when the plane's current framebuffer is destroyed,
 * and when restoring fbdev mode.
 */
void drm_plane_force_disable(struct drm_plane *plane)
{
	int ret;

	if (!plane->fb)
		return;

	plane->old_fb = plane->fb;
	ret = plane->funcs->disable_plane(plane);
	if (ret) {
		DRM_ERROR("failed to disable plane with busy fb\n");
		plane->old_fb = NULL;
		return;
	}
	/* disconnect the plane from the fb and crtc: */
	drm_framebuffer_unreference(plane->old_fb);
	plane->old_fb = NULL;
	plane->fb = NULL;
	plane->crtc = NULL;
}
EXPORT_SYMBOL(drm_plane_force_disable);

/**
 * drm_mode_plane_set_obj_prop - set the value of a property
 * @plane: drm plane object to set property value for
 * @property: property to set
 * @value: value the property should be set to
 *
 * This functions sets a given property on a given plane object. This function
 * calls the driver's ->set_property callback and changes the software state of
 * the property if the callback succeeds.
 *
 * Returns:
 * Zero on success, error code on failure.
 */
int drm_mode_plane_set_obj_prop(struct drm_plane *plane,
				struct drm_property *property,
				uint64_t value)
{
	int ret = -EINVAL;
	struct drm_mode_object *obj = &plane->base;

	if (plane->funcs->set_property)
		ret = plane->funcs->set_property(plane, property, value);
	if (!ret)
		drm_object_property_set_value(obj, property, value);

	return ret;
}
EXPORT_SYMBOL(drm_mode_plane_set_obj_prop);

int drm_mode_getplane_res(struct drm_device *dev, void *data,
			  struct drm_file *file_priv)
{
	struct drm_mode_get_plane_res *plane_resp = data;
	struct drm_mode_config *config;
	struct drm_plane *plane;
	uint32_t __user *plane_ptr;
	int copied = 0;
	unsigned num_planes;

	if (!drm_core_check_feature(dev, DRIVER_MODESET))
		return -EINVAL;

	config = &dev->mode_config;

	if (file_priv->universal_planes)
		num_planes = config->num_total_plane;
	else
		num_planes = config->num_overlay_plane;

	/*
	 * This ioctl is called twice, once to determine how much space is
	 * needed, and the 2nd time to fill it.
	 */
	if (num_planes &&
	    (plane_resp->count_planes >= num_planes)) {
		plane_ptr = (uint32_t __user *)(unsigned long)plane_resp->plane_id_ptr;

		/* Plane lists are invariant, no locking needed. */
		drm_for_each_plane(plane, dev) {
			/*
			 * Unless userspace set the 'universal planes'
			 * capability bit, only advertise overlays.
			 */
			if (plane->type != DRM_PLANE_TYPE_OVERLAY &&
			    !file_priv->universal_planes)
				continue;

			if (put_user(plane->base.id, plane_ptr + copied))
				return -EFAULT;
			copied++;
		}
	}
	plane_resp->count_planes = num_planes;

	return 0;
}

int drm_mode_getplane(struct drm_device *dev, void *data,
		      struct drm_file *file_priv)
{
	struct drm_mode_get_plane *plane_resp = data;
	struct drm_plane *plane;
	uint32_t __user *format_ptr;

	if (!drm_core_check_feature(dev, DRIVER_MODESET))
		return -EINVAL;

	plane = drm_plane_find(dev, plane_resp->plane_id);
	if (!plane)
		return -ENOENT;

	drm_modeset_lock(&plane->mutex, NULL);
	if (plane->crtc)
		plane_resp->crtc_id = plane->crtc->base.id;
	else
		plane_resp->crtc_id = 0;

	if (plane->fb)
		plane_resp->fb_id = plane->fb->base.id;
	else
		plane_resp->fb_id = 0;
	drm_modeset_unlock(&plane->mutex);

	plane_resp->plane_id = plane->base.id;
	plane_resp->possible_crtcs = plane->possible_crtcs;
	plane_resp->gamma_size = 0;

	/*
	 * This ioctl is called twice, once to determine how much space is
	 * needed, and the 2nd time to fill it.
	 */
	if (plane->format_count &&
	    (plane_resp->count_format_types >= plane->format_count)) {
		format_ptr = (uint32_t __user *)(unsigned long)plane_resp->format_type_ptr;
		if (copy_to_user(format_ptr,
				 plane->format_types,
				 sizeof(uint32_t) * plane->format_count)) {
			return -EFAULT;
		}
	}
	plane_resp->count_format_types = plane->format_count;

	return 0;
}

int drm_plane_check_pixel_format(const struct drm_plane *plane, u32 format)
{
	unsigned int i;

	for (i = 0; i < plane->format_count; i++) {
		if (format == plane->format_types[i])
			return 0;
	}

	return -EINVAL;
}

/*
 * setplane_internal - setplane handler for internal callers
 *
 * Note that we assume an extra reference has already been taken on fb.  If the
 * update fails, this reference will be dropped before return; if it succeeds,
 * the previous framebuffer (if any) will be unreferenced instead.
 *
 * src_{x,y,w,h} are provided in 16.16 fixed point format
 */
static int __setplane_internal(struct drm_plane *plane,
			       struct drm_crtc *crtc,
			       struct drm_framebuffer *fb,
			       int32_t crtc_x, int32_t crtc_y,
			       uint32_t crtc_w, uint32_t crtc_h,
			       /* src_{x,y,w,h} values are 16.16 fixed point */
			       uint32_t src_x, uint32_t src_y,
			       uint32_t src_w, uint32_t src_h)
{
	int ret = 0;

	/* No fb means shut it down */
	if (!fb) {
		plane->old_fb = plane->fb;
		ret = plane->funcs->disable_plane(plane);
		if (!ret) {
			plane->crtc = NULL;
			plane->fb = NULL;
		} else {
			plane->old_fb = NULL;
		}
		goto out;
	}

	/* Check whether this plane is usable on this CRTC */
	if (!(plane->possible_crtcs & drm_crtc_mask(crtc))) {
		DRM_DEBUG_KMS("Invalid crtc for plane\n");
		ret = -EINVAL;
		goto out;
	}

	/* Check whether this plane supports the fb pixel format. */
	ret = drm_plane_check_pixel_format(plane, fb->pixel_format);
	if (ret) {
		struct drm_format_name_buf format_name;
		DRM_DEBUG_KMS("Invalid pixel format %s\n",
		              drm_get_format_name(fb->pixel_format,
		                                  &format_name));
		goto out;
	}

	/* Give drivers some help against integer overflows */
	if (crtc_w > INT_MAX ||
	    crtc_x > INT_MAX - (int32_t) crtc_w ||
	    crtc_h > INT_MAX ||
	    crtc_y > INT_MAX - (int32_t) crtc_h) {
		DRM_DEBUG_KMS("Invalid CRTC coordinates %ux%u+%d+%d\n",
			      crtc_w, crtc_h, crtc_x, crtc_y);
		ret = -ERANGE;
		goto out;
	}

	ret = drm_framebuffer_check_src_coords(src_x, src_y, src_w, src_h, fb);
	if (ret)
		goto out;

	plane->old_fb = plane->fb;
	ret = plane->funcs->update_plane(plane, crtc, fb,
					 crtc_x, crtc_y, crtc_w, crtc_h,
					 src_x, src_y, src_w, src_h);
	if (!ret) {
		plane->crtc = crtc;
		plane->fb = fb;
		fb = NULL;
	} else {
		plane->old_fb = NULL;
	}

out:
	if (fb)
		drm_framebuffer_unreference(fb);
	if (plane->old_fb)
		drm_framebuffer_unreference(plane->old_fb);
	plane->old_fb = NULL;

	return ret;
}

static int setplane_internal(struct drm_plane *plane,
			     struct drm_crtc *crtc,
			     struct drm_framebuffer *fb,
			     int32_t crtc_x, int32_t crtc_y,
			     uint32_t crtc_w, uint32_t crtc_h,
			     /* src_{x,y,w,h} values are 16.16 fixed point */
			     uint32_t src_x, uint32_t src_y,
			     uint32_t src_w, uint32_t src_h)
{
	int ret;

	drm_modeset_lock_all(plane->dev);
	ret = __setplane_internal(plane, crtc, fb,
				  crtc_x, crtc_y, crtc_w, crtc_h,
				  src_x, src_y, src_w, src_h);
	drm_modeset_unlock_all(plane->dev);

	return ret;
}

int drm_mode_setplane(struct drm_device *dev, void *data,
		      struct drm_file *file_priv)
{
	struct drm_mode_set_plane *plane_req = data;
	struct drm_plane *plane;
	struct drm_crtc *crtc = NULL;
	struct drm_framebuffer *fb = NULL;

	if (!drm_core_check_feature(dev, DRIVER_MODESET))
		return -EINVAL;

	/*
	 * First, find the plane, crtc, and fb objects.  If not available,
	 * we don't bother to call the driver.
	 */
	plane = drm_plane_find(dev, plane_req->plane_id);
	if (!plane) {
		DRM_DEBUG_KMS("Unknown plane ID %d\n",
			      plane_req->plane_id);
		return -ENOENT;
	}

	if (plane_req->fb_id) {
		fb = drm_framebuffer_lookup(dev, plane_req->fb_id);
		if (!fb) {
			DRM_DEBUG_KMS("Unknown framebuffer ID %d\n",
				      plane_req->fb_id);
			return -ENOENT;
		}

		crtc = drm_crtc_find(dev, plane_req->crtc_id);
		if (!crtc) {
			DRM_DEBUG_KMS("Unknown crtc ID %d\n",
				      plane_req->crtc_id);
			return -ENOENT;
		}
	}

	/*
	 * setplane_internal will take care of deref'ing either the old or new
	 * framebuffer depending on success.
	 */
	return setplane_internal(plane, crtc, fb,
				 plane_req->crtc_x, plane_req->crtc_y,
				 plane_req->crtc_w, plane_req->crtc_h,
				 plane_req->src_x, plane_req->src_y,
				 plane_req->src_w, plane_req->src_h);
}

static int drm_mode_cursor_universal(struct drm_crtc *crtc,
				     struct drm_mode_cursor2 *req,
				     struct drm_file *file_priv)
{
	struct drm_device *dev = crtc->dev;
	struct drm_framebuffer *fb = NULL;
	struct drm_mode_fb_cmd2 fbreq = {
		.width = req->width,
		.height = req->height,
		.pixel_format = DRM_FORMAT_ARGB8888,
		.pitches = { req->width * 4 },
		.handles = { req->handle },
	};
	int32_t crtc_x, crtc_y;
	uint32_t crtc_w = 0, crtc_h = 0;
	uint32_t src_w = 0, src_h = 0;
	int ret = 0;

	BUG_ON(!crtc->cursor);
	WARN_ON(crtc->cursor->crtc != crtc && crtc->cursor->crtc != NULL);

	/*
	 * Obtain fb we'll be using (either new or existing) and take an extra
	 * reference to it if fb != null.  setplane will take care of dropping
	 * the reference if the plane update fails.
	 */
	if (req->flags & DRM_MODE_CURSOR_BO) {
		if (req->handle) {
			fb = drm_internal_framebuffer_create(dev, &fbreq, file_priv);
			if (IS_ERR(fb)) {
				DRM_DEBUG_KMS("failed to wrap cursor buffer in drm framebuffer\n");
				return PTR_ERR(fb);
			}
			fb->hot_x = req->hot_x;
			fb->hot_y = req->hot_y;
		} else {
			fb = NULL;
		}
	} else {
		fb = crtc->cursor->fb;
		if (fb)
			drm_framebuffer_reference(fb);
	}

	if (req->flags & DRM_MODE_CURSOR_MOVE) {
		crtc_x = req->x;
		crtc_y = req->y;
	} else {
		crtc_x = crtc->cursor_x;
		crtc_y = crtc->cursor_y;
	}

	if (fb) {
		crtc_w = fb->width;
		crtc_h = fb->height;
		src_w = fb->width << 16;
		src_h = fb->height << 16;
	}

	/*
	 * setplane_internal will take care of deref'ing either the old or new
	 * framebuffer depending on success.
	 */
	ret = __setplane_internal(crtc->cursor, crtc, fb,
				crtc_x, crtc_y, crtc_w, crtc_h,
				0, 0, src_w, src_h);

	/* Update successful; save new cursor position, if necessary */
	if (ret == 0 && req->flags & DRM_MODE_CURSOR_MOVE) {
		crtc->cursor_x = req->x;
		crtc->cursor_y = req->y;
	}

	return ret;
}

static int drm_mode_cursor_common(struct drm_device *dev,
				  struct drm_mode_cursor2 *req,
				  struct drm_file *file_priv)
{
	struct drm_crtc *crtc;
	int ret = 0;

	if (!drm_core_check_feature(dev, DRIVER_MODESET))
		return -EINVAL;

	if (!req->flags || (~DRM_MODE_CURSOR_FLAGS & req->flags))
		return -EINVAL;

	crtc = drm_crtc_find(dev, req->crtc_id);
	if (!crtc) {
		DRM_DEBUG_KMS("Unknown CRTC ID %d\n", req->crtc_id);
		return -ENOENT;
	}

	/*
	 * If this crtc has a universal cursor plane, call that plane's update
	 * handler rather than using legacy cursor handlers.
	 */
	drm_modeset_lock_crtc(crtc, crtc->cursor);
	if (crtc->cursor) {
		ret = drm_mode_cursor_universal(crtc, req, file_priv);
		goto out;
	}

	if (req->flags & DRM_MODE_CURSOR_BO) {
		if (!crtc->funcs->cursor_set && !crtc->funcs->cursor_set2) {
			ret = -ENXIO;
			goto out;
		}
		/* Turns off the cursor if handle is 0 */
		if (crtc->funcs->cursor_set2)
			ret = crtc->funcs->cursor_set2(crtc, file_priv, req->handle,
						      req->width, req->height, req->hot_x, req->hot_y);
		else
			ret = crtc->funcs->cursor_set(crtc, file_priv, req->handle,
						      req->width, req->height);
	}

	if (req->flags & DRM_MODE_CURSOR_MOVE) {
		if (crtc->funcs->cursor_move) {
			ret = crtc->funcs->cursor_move(crtc, req->x, req->y);
		} else {
			ret = -EFAULT;
			goto out;
		}
	}
out:
	drm_modeset_unlock_crtc(crtc);

	return ret;

}


int drm_mode_cursor_ioctl(struct drm_device *dev,
			  void *data, struct drm_file *file_priv)
{
	struct drm_mode_cursor *req = data;
	struct drm_mode_cursor2 new_req;

	memcpy(&new_req, req, sizeof(struct drm_mode_cursor));
	new_req.hot_x = new_req.hot_y = 0;

	return drm_mode_cursor_common(dev, &new_req, file_priv);
}

/*
 * Set the cursor configuration based on user request. This implements the 2nd
 * version of the cursor ioctl, which allows userspace to additionally specify
 * the hotspot of the pointer.
 */
int drm_mode_cursor2_ioctl(struct drm_device *dev,
			   void *data, struct drm_file *file_priv)
{
	struct drm_mode_cursor2 *req = data;

	return drm_mode_cursor_common(dev, req, file_priv);
}

int drm_mode_page_flip_ioctl(struct drm_device *dev,
			     void *data, struct drm_file *file_priv)
{
	struct drm_mode_crtc_page_flip_target *page_flip = data;
	struct drm_crtc *crtc;
	struct drm_framebuffer *fb = NULL;
	struct drm_pending_vblank_event *e = NULL;
	u32 target_vblank = page_flip->sequence;
	int ret = -EINVAL;

	if (!drm_core_check_feature(dev, DRIVER_MODESET))
		return -EINVAL;

	if (page_flip->flags & ~DRM_MODE_PAGE_FLIP_FLAGS)
		return -EINVAL;

	if (page_flip->sequence != 0 && !(page_flip->flags & DRM_MODE_PAGE_FLIP_TARGET))
		return -EINVAL;

	/* Only one of the DRM_MODE_PAGE_FLIP_TARGET_ABSOLUTE/RELATIVE flags
	 * can be specified
	 */
	if ((page_flip->flags & DRM_MODE_PAGE_FLIP_TARGET) == DRM_MODE_PAGE_FLIP_TARGET)
		return -EINVAL;

	if ((page_flip->flags & DRM_MODE_PAGE_FLIP_ASYNC) && !dev->mode_config.async_page_flip)
		return -EINVAL;

	crtc = drm_crtc_find(dev, page_flip->crtc_id);
	if (!crtc)
		return -ENOENT;

	if (crtc->funcs->page_flip_target) {
		u32 current_vblank;
		int r;

		r = drm_crtc_vblank_get(crtc);
		if (r)
			return r;

		current_vblank = drm_crtc_vblank_count(crtc);

		switch (page_flip->flags & DRM_MODE_PAGE_FLIP_TARGET) {
		case DRM_MODE_PAGE_FLIP_TARGET_ABSOLUTE:
			if ((int)(target_vblank - current_vblank) > 1) {
				DRM_DEBUG("Invalid absolute flip target %u, "
					  "must be <= %u\n", target_vblank,
					  current_vblank + 1);
				drm_crtc_vblank_put(crtc);
				return -EINVAL;
			}
			break;
		case DRM_MODE_PAGE_FLIP_TARGET_RELATIVE:
			if (target_vblank != 0 && target_vblank != 1) {
				DRM_DEBUG("Invalid relative flip target %u, "
					  "must be 0 or 1\n", target_vblank);
				drm_crtc_vblank_put(crtc);
				return -EINVAL;
			}
			target_vblank += current_vblank;
			break;
		default:
			target_vblank = current_vblank +
				!(page_flip->flags & DRM_MODE_PAGE_FLIP_ASYNC);
			break;
		}
	} else if (crtc->funcs->page_flip == NULL ||
		   (page_flip->flags & DRM_MODE_PAGE_FLIP_TARGET)) {
		return -EINVAL;
	}

	drm_modeset_lock_crtc(crtc, crtc->primary);
	if (crtc->primary->fb == NULL) {
		/* The framebuffer is currently unbound, presumably
		 * due to a hotplug event, that userspace has not
		 * yet discovered.
		 */
		ret = -EBUSY;
		goto out;
	}

	fb = drm_framebuffer_lookup(dev, page_flip->fb_id);
	if (!fb) {
		ret = -ENOENT;
		goto out;
	}

	if (crtc->state) {
		const struct drm_plane_state *state = crtc->primary->state;

		ret = drm_framebuffer_check_src_coords(state->src_x,
						       state->src_y,
						       state->src_w,
						       state->src_h,
						       fb);
	} else {
		ret = drm_crtc_check_viewport(crtc, crtc->x, crtc->y, &crtc->mode, fb);
	}
	if (ret)
		goto out;

	if (crtc->primary->fb->pixel_format != fb->pixel_format) {
		DRM_DEBUG_KMS("Page flip is not allowed to change frame buffer format.\n");
		ret = -EINVAL;
		goto out;
	}

	if (page_flip->flags & DRM_MODE_PAGE_FLIP_EVENT) {
		e = kzalloc(sizeof *e, GFP_KERNEL);
		if (!e) {
			ret = -ENOMEM;
			goto out;
		}
		e->event.base.type = DRM_EVENT_FLIP_COMPLETE;
		e->event.base.length = sizeof(e->event);
		e->event.user_data = page_flip->user_data;
		ret = drm_event_reserve_init(dev, file_priv, &e->base, &e->event.base);
		if (ret) {
			kfree(e);
			goto out;
		}
	}

	crtc->primary->old_fb = crtc->primary->fb;
	if (crtc->funcs->page_flip_target)
		ret = crtc->funcs->page_flip_target(crtc, fb, e,
						    page_flip->flags,
						    target_vblank);
	else
		ret = crtc->funcs->page_flip(crtc, fb, e, page_flip->flags);
	if (ret) {
		if (page_flip->flags & DRM_MODE_PAGE_FLIP_EVENT)
			drm_event_cancel_free(dev, &e->base);
		/* Keep the old fb, don't unref it. */
		crtc->primary->old_fb = NULL;
	} else {
		crtc->primary->fb = fb;
		/* Unref only the old framebuffer. */
		fb = NULL;
	}

out:
	if (ret && crtc->funcs->page_flip_target)
		drm_crtc_vblank_put(crtc);
	if (fb)
		drm_framebuffer_unreference(fb);
	if (crtc->primary->old_fb)
		drm_framebuffer_unreference(crtc->primary->old_fb);
	crtc->primary->old_fb = NULL;
	drm_modeset_unlock_crtc(crtc);

	return ret;
}