summaryrefslogtreecommitdiff
path: root/drivers/gpu/drm/vboxvideo/vbox_mode.c
blob: 07fd7826b6a254f438e0f1fde5952c3d89c3f68b (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
// SPDX-License-Identifier: MIT
/*
 * Copyright (C) 2013-2017 Oracle Corporation
 * This file is based on ast_mode.c
 * Copyright 2012 Red Hat Inc.
 * Parts based on xf86-video-ast
 * Copyright (c) 2005 ASPEED Technology Inc.
 * Authors: Dave Airlie <airlied@redhat.com>
 *          Michael Thayer <michael.thayer@oracle.com,
 *          Hans de Goede <hdegoede@redhat.com>
 */

#include <linux/dma-buf-map.h>
#include <linux/export.h>

#include <drm/drm_atomic.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_fb_helper.h>
#include <drm/drm_fourcc.h>
#include <drm/drm_gem_atomic_helper.h>
#include <drm/drm_gem_framebuffer_helper.h>
#include <drm/drm_plane_helper.h>
#include <drm/drm_probe_helper.h>

#include "hgsmi_channels.h"
#include "vbox_drv.h"
#include "vboxvideo.h"

/*
 * Set a graphics mode.  Poke any required values into registers, do an HGSMI
 * mode set and tell the host we support advanced graphics functions.
 */
static void vbox_do_modeset(struct drm_crtc *crtc)
{
	struct drm_framebuffer *fb = crtc->primary->state->fb;
	struct vbox_crtc *vbox_crtc = to_vbox_crtc(crtc);
	struct vbox_private *vbox;
	int width, height, bpp, pitch;
	u16 flags;
	s32 x_offset, y_offset;

	vbox = to_vbox_dev(crtc->dev);
	width = vbox_crtc->width ? vbox_crtc->width : 640;
	height = vbox_crtc->height ? vbox_crtc->height : 480;
	bpp = fb ? fb->format->cpp[0] * 8 : 32;
	pitch = fb ? fb->pitches[0] : width * bpp / 8;
	x_offset = vbox->single_framebuffer ? vbox_crtc->x : vbox_crtc->x_hint;
	y_offset = vbox->single_framebuffer ? vbox_crtc->y : vbox_crtc->y_hint;

	/*
	 * This is the old way of setting graphics modes.  It assumed one screen
	 * and a frame-buffer at the start of video RAM.  On older versions of
	 * VirtualBox, certain parts of the code still assume that the first
	 * screen is programmed this way, so try to fake it.
	 */
	if (vbox_crtc->crtc_id == 0 && fb &&
	    vbox_crtc->fb_offset / pitch < 0xffff - crtc->y &&
	    vbox_crtc->fb_offset % (bpp / 8) == 0) {
		vbox_write_ioport(VBE_DISPI_INDEX_XRES, width);
		vbox_write_ioport(VBE_DISPI_INDEX_YRES, height);
		vbox_write_ioport(VBE_DISPI_INDEX_VIRT_WIDTH, pitch * 8 / bpp);
		vbox_write_ioport(VBE_DISPI_INDEX_BPP, bpp);
		vbox_write_ioport(VBE_DISPI_INDEX_ENABLE, VBE_DISPI_ENABLED);
		vbox_write_ioport(VBE_DISPI_INDEX_X_OFFSET,
			vbox_crtc->fb_offset % pitch / bpp * 8 + vbox_crtc->x);
		vbox_write_ioport(VBE_DISPI_INDEX_Y_OFFSET,
				  vbox_crtc->fb_offset / pitch + vbox_crtc->y);
	}

	flags = VBVA_SCREEN_F_ACTIVE;
	flags |= (fb && crtc->state->enable) ? 0 : VBVA_SCREEN_F_BLANK;
	flags |= vbox_crtc->disconnected ? VBVA_SCREEN_F_DISABLED : 0;
	hgsmi_process_display_info(vbox->guest_pool, vbox_crtc->crtc_id,
				   x_offset, y_offset,
				   vbox_crtc->x * bpp / 8 +
							vbox_crtc->y * pitch,
				   pitch, width, height, bpp, flags);
}

static int vbox_set_view(struct drm_crtc *crtc)
{
	struct vbox_crtc *vbox_crtc = to_vbox_crtc(crtc);
	struct vbox_private *vbox = to_vbox_dev(crtc->dev);
	struct vbva_infoview *p;

	/*
	 * Tell the host about the view.  This design originally targeted the
	 * Windows XP driver architecture and assumed that each screen would
	 * have a dedicated frame buffer with the command buffer following it,
	 * the whole being a "view".  The host works out which screen a command
	 * buffer belongs to by checking whether it is in the first view, then
	 * whether it is in the second and so on.  The first match wins.  We
	 * cheat around this by making the first view be the managed memory
	 * plus the first command buffer, the second the same plus the second
	 * buffer and so on.
	 */
	p = hgsmi_buffer_alloc(vbox->guest_pool, sizeof(*p),
			       HGSMI_CH_VBVA, VBVA_INFO_VIEW);
	if (!p)
		return -ENOMEM;

	p->view_index = vbox_crtc->crtc_id;
	p->view_offset = vbox_crtc->fb_offset;
	p->view_size = vbox->available_vram_size - vbox_crtc->fb_offset +
		       vbox_crtc->crtc_id * VBVA_MIN_BUFFER_SIZE;
	p->max_screen_size = vbox->available_vram_size - vbox_crtc->fb_offset;

	hgsmi_buffer_submit(vbox->guest_pool, p);
	hgsmi_buffer_free(vbox->guest_pool, p);

	return 0;
}

/*
 * Try to map the layout of virtual screens to the range of the input device.
 * Return true if we need to re-set the crtc modes due to screen offset
 * changes.
 */
static bool vbox_set_up_input_mapping(struct vbox_private *vbox)
{
	struct drm_crtc *crtci;
	struct drm_connector *connectori;
	struct drm_framebuffer *fb, *fb1 = NULL;
	bool single_framebuffer = true;
	bool old_single_framebuffer = vbox->single_framebuffer;
	u16 width = 0, height = 0;

	/*
	 * Are we using an X.Org-style single large frame-buffer for all crtcs?
	 * If so then screen layout can be deduced from the crtc offsets.
	 * Same fall-back if this is the fbdev frame-buffer.
	 */
	list_for_each_entry(crtci, &vbox->ddev.mode_config.crtc_list, head) {
		fb = crtci->primary->state->fb;
		if (!fb)
			continue;

		if (!fb1) {
			fb1 = fb;
			if (fb1 == vbox->ddev.fb_helper->fb)
				break;
		} else if (fb != fb1) {
			single_framebuffer = false;
		}
	}
	if (!fb1)
		return false;

	if (single_framebuffer) {
		vbox->single_framebuffer = true;
		vbox->input_mapping_width = fb1->width;
		vbox->input_mapping_height = fb1->height;
		return old_single_framebuffer != vbox->single_framebuffer;
	}
	/* Otherwise calculate the total span of all screens. */
	list_for_each_entry(connectori, &vbox->ddev.mode_config.connector_list,
			    head) {
		struct vbox_connector *vbox_connector =
		    to_vbox_connector(connectori);
		struct vbox_crtc *vbox_crtc = vbox_connector->vbox_crtc;

		width = max_t(u16, width, vbox_crtc->x_hint +
					  vbox_connector->mode_hint.width);
		height = max_t(u16, height, vbox_crtc->y_hint +
					    vbox_connector->mode_hint.height);
	}

	vbox->single_framebuffer = false;
	vbox->input_mapping_width = width;
	vbox->input_mapping_height = height;

	return old_single_framebuffer != vbox->single_framebuffer;
}

static void vbox_crtc_set_base_and_mode(struct drm_crtc *crtc,
					struct drm_framebuffer *fb,
					int x, int y)
{
	struct drm_gem_vram_object *gbo = drm_gem_vram_of_gem(fb->obj[0]);
	struct vbox_private *vbox = to_vbox_dev(crtc->dev);
	struct vbox_crtc *vbox_crtc = to_vbox_crtc(crtc);
	bool needs_modeset = drm_atomic_crtc_needs_modeset(crtc->state);

	mutex_lock(&vbox->hw_mutex);

	if (crtc->state->enable) {
		vbox_crtc->width = crtc->state->mode.hdisplay;
		vbox_crtc->height = crtc->state->mode.vdisplay;
	}

	vbox_crtc->x = x;
	vbox_crtc->y = y;
	vbox_crtc->fb_offset = drm_gem_vram_offset(gbo);

	/* vbox_do_modeset() checks vbox->single_framebuffer so update it now */
	if (needs_modeset && vbox_set_up_input_mapping(vbox)) {
		struct drm_crtc *crtci;

		list_for_each_entry(crtci, &vbox->ddev.mode_config.crtc_list,
				    head) {
			if (crtci == crtc)
				continue;
			vbox_do_modeset(crtci);
		}
	}

	vbox_set_view(crtc);
	vbox_do_modeset(crtc);

	if (needs_modeset)
		hgsmi_update_input_mapping(vbox->guest_pool, 0, 0,
					   vbox->input_mapping_width,
					   vbox->input_mapping_height);

	mutex_unlock(&vbox->hw_mutex);
}

static void vbox_crtc_atomic_enable(struct drm_crtc *crtc,
				    struct drm_atomic_state *state)
{
}

static void vbox_crtc_atomic_disable(struct drm_crtc *crtc,
				     struct drm_atomic_state *state)
{
}

static void vbox_crtc_atomic_flush(struct drm_crtc *crtc,
				   struct drm_atomic_state *state)
{
}

static const struct drm_crtc_helper_funcs vbox_crtc_helper_funcs = {
	.atomic_enable = vbox_crtc_atomic_enable,
	.atomic_disable = vbox_crtc_atomic_disable,
	.atomic_flush = vbox_crtc_atomic_flush,
};

static void vbox_crtc_destroy(struct drm_crtc *crtc)
{
	drm_crtc_cleanup(crtc);
	kfree(crtc);
}

static const struct drm_crtc_funcs vbox_crtc_funcs = {
	.set_config = drm_atomic_helper_set_config,
	.page_flip = drm_atomic_helper_page_flip,
	/* .gamma_set = vbox_crtc_gamma_set, */
	.destroy = vbox_crtc_destroy,
	.reset = drm_atomic_helper_crtc_reset,
	.atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state,
	.atomic_destroy_state = drm_atomic_helper_crtc_destroy_state,
};

static int vbox_primary_atomic_check(struct drm_plane *plane,
				     struct drm_atomic_state *state)
{
	struct drm_plane_state *new_state = drm_atomic_get_new_plane_state(state,
									   plane);
	struct drm_crtc_state *crtc_state = NULL;

	if (new_state->crtc) {
		crtc_state = drm_atomic_get_existing_crtc_state(state,
								new_state->crtc);
		if (WARN_ON(!crtc_state))
			return -EINVAL;
	}

	return drm_atomic_helper_check_plane_state(new_state, crtc_state,
						   DRM_PLANE_HELPER_NO_SCALING,
						   DRM_PLANE_HELPER_NO_SCALING,
						   false, true);
}

static void vbox_primary_atomic_update(struct drm_plane *plane,
				       struct drm_atomic_state *state)
{
	struct drm_plane_state *new_state = plane->state;
	struct drm_crtc *crtc = new_state->crtc;
	struct drm_framebuffer *fb = new_state->fb;
	struct vbox_private *vbox = to_vbox_dev(fb->dev);
	struct drm_mode_rect *clips;
	uint32_t num_clips, i;

	vbox_crtc_set_base_and_mode(crtc, fb,
				    new_state->src_x >> 16,
				    new_state->src_y >> 16);

	/* Send information about dirty rectangles to VBVA. */

	clips = drm_plane_get_damage_clips(new_state);
	num_clips = drm_plane_get_damage_clips_count(new_state);

	if (!num_clips)
		return;

	mutex_lock(&vbox->hw_mutex);

	for (i = 0; i < num_clips; ++i, ++clips) {
		struct vbva_cmd_hdr cmd_hdr;
		unsigned int crtc_id = to_vbox_crtc(crtc)->crtc_id;

		cmd_hdr.x = (s16)clips->x1;
		cmd_hdr.y = (s16)clips->y1;
		cmd_hdr.w = (u16)clips->x2 - clips->x1;
		cmd_hdr.h = (u16)clips->y2 - clips->y1;

		if (!vbva_buffer_begin_update(&vbox->vbva_info[crtc_id],
					      vbox->guest_pool))
			continue;

		vbva_write(&vbox->vbva_info[crtc_id], vbox->guest_pool,
			   &cmd_hdr, sizeof(cmd_hdr));
		vbva_buffer_end_update(&vbox->vbva_info[crtc_id]);
	}

	mutex_unlock(&vbox->hw_mutex);
}

static void vbox_primary_atomic_disable(struct drm_plane *plane,
					struct drm_atomic_state *state)
{
	struct drm_plane_state *old_state = drm_atomic_get_old_plane_state(state,
									   plane);
	struct drm_crtc *crtc = old_state->crtc;

	/* vbox_do_modeset checks plane->state->fb and will disable if NULL */
	vbox_crtc_set_base_and_mode(crtc, old_state->fb,
				    old_state->src_x >> 16,
				    old_state->src_y >> 16);
}

static int vbox_cursor_atomic_check(struct drm_plane *plane,
				    struct drm_atomic_state *state)
{
	struct drm_plane_state *new_state = drm_atomic_get_new_plane_state(state,
									   plane);
	struct drm_crtc_state *crtc_state = NULL;
	u32 width = new_state->crtc_w;
	u32 height = new_state->crtc_h;
	int ret;

	if (new_state->crtc) {
		crtc_state = drm_atomic_get_existing_crtc_state(state,
								new_state->crtc);
		if (WARN_ON(!crtc_state))
			return -EINVAL;
	}

	ret = drm_atomic_helper_check_plane_state(new_state, crtc_state,
						  DRM_PLANE_HELPER_NO_SCALING,
						  DRM_PLANE_HELPER_NO_SCALING,
						  true, true);
	if (ret)
		return ret;

	if (!new_state->fb)
		return 0;

	if (width > VBOX_MAX_CURSOR_WIDTH || height > VBOX_MAX_CURSOR_HEIGHT ||
	    width == 0 || height == 0)
		return -EINVAL;

	return 0;
}

/*
 * Copy the ARGB image and generate the mask, which is needed in case the host
 * does not support ARGB cursors.  The mask is a 1BPP bitmap with the bit set
 * if the corresponding alpha value in the ARGB image is greater than 0xF0.
 */
static void copy_cursor_image(u8 *src, u8 *dst, u32 width, u32 height,
			      size_t mask_size)
{
	size_t line_size = (width + 7) / 8;
	u32 i, j;

	memcpy(dst + mask_size, src, width * height * 4);
	for (i = 0; i < height; ++i)
		for (j = 0; j < width; ++j)
			if (((u32 *)src)[i * width + j] > 0xf0000000)
				dst[i * line_size + j / 8] |= (0x80 >> (j % 8));
}

static void vbox_cursor_atomic_update(struct drm_plane *plane,
				      struct drm_atomic_state *state)
{
	struct drm_plane_state *old_state = drm_atomic_get_old_plane_state(state,
									   plane);
	struct drm_plane_state *new_state = plane->state;
	struct vbox_private *vbox =
		container_of(plane->dev, struct vbox_private, ddev);
	struct vbox_crtc *vbox_crtc = to_vbox_crtc(new_state->crtc);
	struct drm_framebuffer *fb = new_state->fb;
	u32 width = new_state->crtc_w;
	u32 height = new_state->crtc_h;
	struct drm_shadow_plane_state *shadow_plane_state =
		to_drm_shadow_plane_state(new_state);
	struct dma_buf_map map = shadow_plane_state->map[0];
	u8 *src = map.vaddr; /* TODO: Use mapping abstraction properly */
	size_t data_size, mask_size;
	u32 flags;

	/*
	 * VirtualBox uses the host windowing system to draw the cursor so
	 * moves are a no-op, we only need to upload new cursor sprites.
	 */
	if (fb == old_state->fb)
		return;

	mutex_lock(&vbox->hw_mutex);

	vbox_crtc->cursor_enabled = true;

	/*
	 * The mask must be calculated based on the alpha
	 * channel, one bit per ARGB word, and must be 32-bit
	 * padded.
	 */
	mask_size = ((width + 7) / 8 * height + 3) & ~3;
	data_size = width * height * 4 + mask_size;

	copy_cursor_image(src, vbox->cursor_data, width, height, mask_size);

	flags = VBOX_MOUSE_POINTER_VISIBLE | VBOX_MOUSE_POINTER_SHAPE |
		VBOX_MOUSE_POINTER_ALPHA;
	hgsmi_update_pointer_shape(vbox->guest_pool, flags,
				   min_t(u32, max(fb->hot_x, 0), width),
				   min_t(u32, max(fb->hot_y, 0), height),
				   width, height, vbox->cursor_data, data_size);

	mutex_unlock(&vbox->hw_mutex);
}

static void vbox_cursor_atomic_disable(struct drm_plane *plane,
				       struct drm_atomic_state *state)
{
	struct drm_plane_state *old_state = drm_atomic_get_old_plane_state(state,
									   plane);
	struct vbox_private *vbox =
		container_of(plane->dev, struct vbox_private, ddev);
	struct vbox_crtc *vbox_crtc = to_vbox_crtc(old_state->crtc);
	bool cursor_enabled = false;
	struct drm_crtc *crtci;

	mutex_lock(&vbox->hw_mutex);

	vbox_crtc->cursor_enabled = false;

	list_for_each_entry(crtci, &vbox->ddev.mode_config.crtc_list, head) {
		if (to_vbox_crtc(crtci)->cursor_enabled)
			cursor_enabled = true;
	}

	if (!cursor_enabled)
		hgsmi_update_pointer_shape(vbox->guest_pool, 0, 0, 0,
					   0, 0, NULL, 0);

	mutex_unlock(&vbox->hw_mutex);
}

static const u32 vbox_cursor_plane_formats[] = {
	DRM_FORMAT_ARGB8888,
};

static const struct drm_plane_helper_funcs vbox_cursor_helper_funcs = {
	.atomic_check	= vbox_cursor_atomic_check,
	.atomic_update	= vbox_cursor_atomic_update,
	.atomic_disable	= vbox_cursor_atomic_disable,
	DRM_GEM_SHADOW_PLANE_HELPER_FUNCS,
};

static const struct drm_plane_funcs vbox_cursor_plane_funcs = {
	.update_plane	= drm_atomic_helper_update_plane,
	.disable_plane	= drm_atomic_helper_disable_plane,
	.destroy	= drm_primary_helper_destroy,
	DRM_GEM_SHADOW_PLANE_FUNCS,
};

static const u32 vbox_primary_plane_formats[] = {
	DRM_FORMAT_XRGB8888,
	DRM_FORMAT_ARGB8888,
};

static const struct drm_plane_helper_funcs vbox_primary_helper_funcs = {
	.atomic_check = vbox_primary_atomic_check,
	.atomic_update = vbox_primary_atomic_update,
	.atomic_disable = vbox_primary_atomic_disable,
	.prepare_fb	= drm_gem_vram_plane_helper_prepare_fb,
	.cleanup_fb	= drm_gem_vram_plane_helper_cleanup_fb,
};

static const struct drm_plane_funcs vbox_primary_plane_funcs = {
	.update_plane	= drm_atomic_helper_update_plane,
	.disable_plane	= drm_atomic_helper_disable_plane,
	.destroy	= drm_primary_helper_destroy,
	.reset		= drm_atomic_helper_plane_reset,
	.atomic_duplicate_state = drm_atomic_helper_plane_duplicate_state,
	.atomic_destroy_state = drm_atomic_helper_plane_destroy_state,
};

static struct drm_plane *vbox_create_plane(struct vbox_private *vbox,
					   unsigned int possible_crtcs,
					   enum drm_plane_type type)
{
	const struct drm_plane_helper_funcs *helper_funcs = NULL;
	const struct drm_plane_funcs *funcs;
	struct drm_plane *plane;
	const u32 *formats;
	int num_formats;
	int err;

	if (type == DRM_PLANE_TYPE_PRIMARY) {
		funcs = &vbox_primary_plane_funcs;
		formats = vbox_primary_plane_formats;
		helper_funcs = &vbox_primary_helper_funcs;
		num_formats = ARRAY_SIZE(vbox_primary_plane_formats);
	} else if (type == DRM_PLANE_TYPE_CURSOR) {
		funcs = &vbox_cursor_plane_funcs;
		formats = vbox_cursor_plane_formats;
		helper_funcs = &vbox_cursor_helper_funcs;
		num_formats = ARRAY_SIZE(vbox_cursor_plane_formats);
	} else {
		return ERR_PTR(-EINVAL);
	}

	plane = kzalloc(sizeof(*plane), GFP_KERNEL);
	if (!plane)
		return ERR_PTR(-ENOMEM);

	err = drm_universal_plane_init(&vbox->ddev, plane, possible_crtcs,
				       funcs, formats, num_formats,
				       NULL, type, NULL);
	if (err)
		goto free_plane;

	drm_plane_helper_add(plane, helper_funcs);

	return plane;

free_plane:
	kfree(plane);
	return ERR_PTR(-EINVAL);
}

static struct vbox_crtc *vbox_crtc_init(struct drm_device *dev, unsigned int i)
{
	struct vbox_private *vbox =
		container_of(dev, struct vbox_private, ddev);
	struct drm_plane *cursor = NULL;
	struct vbox_crtc *vbox_crtc;
	struct drm_plane *primary;
	u32 caps = 0;
	int ret;

	ret = hgsmi_query_conf(vbox->guest_pool,
			       VBOX_VBVA_CONF32_CURSOR_CAPABILITIES, &caps);
	if (ret)
		return ERR_PTR(ret);

	vbox_crtc = kzalloc(sizeof(*vbox_crtc), GFP_KERNEL);
	if (!vbox_crtc)
		return ERR_PTR(-ENOMEM);

	primary = vbox_create_plane(vbox, 1 << i, DRM_PLANE_TYPE_PRIMARY);
	if (IS_ERR(primary)) {
		ret = PTR_ERR(primary);
		goto free_mem;
	}

	if ((caps & VBOX_VBVA_CURSOR_CAPABILITY_HARDWARE)) {
		cursor = vbox_create_plane(vbox, 1 << i, DRM_PLANE_TYPE_CURSOR);
		if (IS_ERR(cursor)) {
			ret = PTR_ERR(cursor);
			goto clean_primary;
		}
	} else {
		DRM_WARN("VirtualBox host is too old, no cursor support\n");
	}

	vbox_crtc->crtc_id = i;

	ret = drm_crtc_init_with_planes(dev, &vbox_crtc->base, primary, cursor,
					&vbox_crtc_funcs, NULL);
	if (ret)
		goto clean_cursor;

	drm_mode_crtc_set_gamma_size(&vbox_crtc->base, 256);
	drm_crtc_helper_add(&vbox_crtc->base, &vbox_crtc_helper_funcs);

	return vbox_crtc;

clean_cursor:
	if (cursor) {
		drm_plane_cleanup(cursor);
		kfree(cursor);
	}
clean_primary:
	drm_plane_cleanup(primary);
	kfree(primary);
free_mem:
	kfree(vbox_crtc);
	return ERR_PTR(ret);
}

static void vbox_encoder_destroy(struct drm_encoder *encoder)
{
	drm_encoder_cleanup(encoder);
	kfree(encoder);
}

static const struct drm_encoder_funcs vbox_enc_funcs = {
	.destroy = vbox_encoder_destroy,
};

static struct drm_encoder *vbox_encoder_init(struct drm_device *dev,
					     unsigned int i)
{
	struct vbox_encoder *vbox_encoder;

	vbox_encoder = kzalloc(sizeof(*vbox_encoder), GFP_KERNEL);
	if (!vbox_encoder)
		return NULL;

	drm_encoder_init(dev, &vbox_encoder->base, &vbox_enc_funcs,
			 DRM_MODE_ENCODER_DAC, NULL);

	vbox_encoder->base.possible_crtcs = 1 << i;
	return &vbox_encoder->base;
}

/*
 * Generate EDID data with a mode-unique serial number for the virtual
 * monitor to try to persuade Unity that different modes correspond to
 * different monitors and it should not try to force the same resolution on
 * them.
 */
static void vbox_set_edid(struct drm_connector *connector, int width,
			  int height)
{
	enum { EDID_SIZE = 128 };
	unsigned char edid[EDID_SIZE] = {
		0x00, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x00,	/* header */
		0x58, 0x58,	/* manufacturer (VBX) */
		0x00, 0x00,	/* product code */
		0x00, 0x00, 0x00, 0x00,	/* serial number goes here */
		0x01,		/* week of manufacture */
		0x00,		/* year of manufacture */
		0x01, 0x03,	/* EDID version */
		0x80,		/* capabilities - digital */
		0x00,		/* horiz. res in cm, zero for projectors */
		0x00,		/* vert. res in cm */
		0x78,		/* display gamma (120 == 2.2). */
		0xEE,		/* features (standby, suspend, off, RGB, std */
				/* colour space, preferred timing mode) */
		0xEE, 0x91, 0xA3, 0x54, 0x4C, 0x99, 0x26, 0x0F, 0x50, 0x54,
		/* chromaticity for standard colour space. */
		0x00, 0x00, 0x00,	/* no default timings */
		0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
		    0x01, 0x01,
		0x01, 0x01, 0x01, 0x01,	/* no standard timings */
		0x00, 0x00, 0x00, 0x06, 0x00, 0x00, 0x06, 0x00, 0x02, 0x02,
		    0x02, 0x02,
		/* descriptor block 1 goes below */
		0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
		/* descriptor block 2, monitor ranges */
		0x00, 0x00, 0x00, 0xFD, 0x00,
		0x00, 0xC8, 0x00, 0xC8, 0x64, 0x00, 0x0A, 0x20, 0x20, 0x20,
		    0x20, 0x20,
		/* 0-200Hz vertical, 0-200KHz horizontal, 1000MHz pixel clock */
		0x20,
		/* descriptor block 3, monitor name */
		0x00, 0x00, 0x00, 0xFC, 0x00,
		'V', 'B', 'O', 'X', ' ', 'm', 'o', 'n', 'i', 't', 'o', 'r',
		'\n',
		/* descriptor block 4: dummy data */
		0x00, 0x00, 0x00, 0x10, 0x00,
		0x0A, 0x20, 0x20, 0x20, 0x20, 0x20,
		0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
		0x20,
		0x00,		/* number of extensions */
		0x00		/* checksum goes here */
	};
	int clock = (width + 6) * (height + 6) * 60 / 10000;
	unsigned int i, sum = 0;

	edid[12] = width & 0xff;
	edid[13] = width >> 8;
	edid[14] = height & 0xff;
	edid[15] = height >> 8;
	edid[54] = clock & 0xff;
	edid[55] = clock >> 8;
	edid[56] = width & 0xff;
	edid[58] = (width >> 4) & 0xf0;
	edid[59] = height & 0xff;
	edid[61] = (height >> 4) & 0xf0;
	for (i = 0; i < EDID_SIZE - 1; ++i)
		sum += edid[i];
	edid[EDID_SIZE - 1] = (0x100 - (sum & 0xFF)) & 0xFF;
	drm_connector_update_edid_property(connector, (struct edid *)edid);
}

static int vbox_get_modes(struct drm_connector *connector)
{
	struct vbox_connector *vbox_connector = NULL;
	struct drm_display_mode *mode = NULL;
	struct vbox_private *vbox = NULL;
	unsigned int num_modes = 0;
	int preferred_width, preferred_height;

	vbox_connector = to_vbox_connector(connector);
	vbox = to_vbox_dev(connector->dev);

	hgsmi_report_flags_location(vbox->guest_pool, GUEST_HEAP_OFFSET(vbox) +
				    HOST_FLAGS_OFFSET);
	if (vbox_connector->vbox_crtc->crtc_id == 0)
		vbox_report_caps(vbox);

	num_modes = drm_add_modes_noedid(connector, 2560, 1600);
	preferred_width = vbox_connector->mode_hint.width ?
			  vbox_connector->mode_hint.width : 1024;
	preferred_height = vbox_connector->mode_hint.height ?
			   vbox_connector->mode_hint.height : 768;
	mode = drm_cvt_mode(connector->dev, preferred_width, preferred_height,
			    60, false, false, false);
	if (mode) {
		mode->type |= DRM_MODE_TYPE_PREFERRED;
		drm_mode_probed_add(connector, mode);
		++num_modes;
	}
	vbox_set_edid(connector, preferred_width, preferred_height);

	if (vbox_connector->vbox_crtc->x_hint != -1)
		drm_object_property_set_value(&connector->base,
			vbox->ddev.mode_config.suggested_x_property,
			vbox_connector->vbox_crtc->x_hint);
	else
		drm_object_property_set_value(&connector->base,
			vbox->ddev.mode_config.suggested_x_property, 0);

	if (vbox_connector->vbox_crtc->y_hint != -1)
		drm_object_property_set_value(&connector->base,
			vbox->ddev.mode_config.suggested_y_property,
			vbox_connector->vbox_crtc->y_hint);
	else
		drm_object_property_set_value(&connector->base,
			vbox->ddev.mode_config.suggested_y_property, 0);

	return num_modes;
}

static void vbox_connector_destroy(struct drm_connector *connector)
{
	drm_connector_unregister(connector);
	drm_connector_cleanup(connector);
	kfree(connector);
}

static enum drm_connector_status
vbox_connector_detect(struct drm_connector *connector, bool force)
{
	struct vbox_connector *vbox_connector;

	vbox_connector = to_vbox_connector(connector);

	return vbox_connector->mode_hint.disconnected ?
	    connector_status_disconnected : connector_status_connected;
}

static int vbox_fill_modes(struct drm_connector *connector, u32 max_x,
			   u32 max_y)
{
	struct vbox_connector *vbox_connector;
	struct drm_device *dev;
	struct drm_display_mode *mode, *iterator;

	vbox_connector = to_vbox_connector(connector);
	dev = vbox_connector->base.dev;
	list_for_each_entry_safe(mode, iterator, &connector->modes, head) {
		list_del(&mode->head);
		drm_mode_destroy(dev, mode);
	}

	return drm_helper_probe_single_connector_modes(connector, max_x, max_y);
}

static const struct drm_connector_helper_funcs vbox_connector_helper_funcs = {
	.get_modes = vbox_get_modes,
};

static const struct drm_connector_funcs vbox_connector_funcs = {
	.detect = vbox_connector_detect,
	.fill_modes = vbox_fill_modes,
	.destroy = vbox_connector_destroy,
	.reset = drm_atomic_helper_connector_reset,
	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
};

static int vbox_connector_init(struct drm_device *dev,
			       struct vbox_crtc *vbox_crtc,
			       struct drm_encoder *encoder)
{
	struct vbox_connector *vbox_connector;
	struct drm_connector *connector;

	vbox_connector = kzalloc(sizeof(*vbox_connector), GFP_KERNEL);
	if (!vbox_connector)
		return -ENOMEM;

	connector = &vbox_connector->base;
	vbox_connector->vbox_crtc = vbox_crtc;

	drm_connector_init(dev, connector, &vbox_connector_funcs,
			   DRM_MODE_CONNECTOR_VGA);
	drm_connector_helper_add(connector, &vbox_connector_helper_funcs);

	connector->interlace_allowed = 0;
	connector->doublescan_allowed = 0;

	drm_mode_create_suggested_offset_properties(dev);
	drm_object_attach_property(&connector->base,
				   dev->mode_config.suggested_x_property, 0);
	drm_object_attach_property(&connector->base,
				   dev->mode_config.suggested_y_property, 0);

	drm_connector_attach_encoder(connector, encoder);

	return 0;
}

static const struct drm_mode_config_funcs vbox_mode_funcs = {
	.fb_create = drm_gem_fb_create_with_dirty,
	.mode_valid = drm_vram_helper_mode_valid,
	.atomic_check = drm_atomic_helper_check,
	.atomic_commit = drm_atomic_helper_commit,
};

int vbox_mode_init(struct vbox_private *vbox)
{
	struct drm_device *dev = &vbox->ddev;
	struct drm_encoder *encoder;
	struct vbox_crtc *vbox_crtc;
	unsigned int i;
	int ret;

	drm_mode_config_init(dev);

	dev->mode_config.funcs = (void *)&vbox_mode_funcs;
	dev->mode_config.min_width = 0;
	dev->mode_config.min_height = 0;
	dev->mode_config.preferred_depth = 24;
	dev->mode_config.max_width = VBE_DISPI_MAX_XRES;
	dev->mode_config.max_height = VBE_DISPI_MAX_YRES;

	for (i = 0; i < vbox->num_crtcs; ++i) {
		vbox_crtc = vbox_crtc_init(dev, i);
		if (IS_ERR(vbox_crtc)) {
			ret = PTR_ERR(vbox_crtc);
			goto err_drm_mode_cleanup;
		}
		encoder = vbox_encoder_init(dev, i);
		if (!encoder) {
			ret = -ENOMEM;
			goto err_drm_mode_cleanup;
		}
		ret = vbox_connector_init(dev, vbox_crtc, encoder);
		if (ret)
			goto err_drm_mode_cleanup;
	}

	drm_mode_config_reset(dev);
	return 0;

err_drm_mode_cleanup:
	drm_mode_config_cleanup(dev);
	return ret;
}

void vbox_mode_fini(struct vbox_private *vbox)
{
	drm_mode_config_cleanup(&vbox->ddev);
}