summaryrefslogtreecommitdiffstats
path: root/kernel/drivers/gpu/drm/qxl/qxl_fb.c
blob: f778c0e8ae3cabc4738165998e37e6b49d0df7b6 (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
/*
 * Copyright © 2013 Red Hat
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice (including the next
 * paragraph) shall be included in all copies or substantial portions of the
 * Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 *
 * Authors:
 *     David Airlie
 */
#include <linux/module.h>
#include <linux/fb.h>

#include "drmP.h"
#include "drm/drm.h"
#include "drm/drm_crtc.h"
#include "drm/drm_crtc_helper.h"
#include "qxl_drv.h"

#include "qxl_object.h"
#include "drm_fb_helper.h"

#define QXL_DIRTY_DELAY (HZ / 30)

#define QXL_FB_OP_FILLRECT 1
#define QXL_FB_OP_COPYAREA 2
#define QXL_FB_OP_IMAGEBLIT 3

struct qxl_fb_op {
	struct list_head head;
	int op_type;
	union {
		struct fb_fillrect fr;
		struct fb_copyarea ca;
		struct fb_image ib;
	} op;
	void *img_data;
};

struct qxl_fbdev {
	struct drm_fb_helper helper;
	struct qxl_framebuffer	qfb;
	struct list_head	fbdev_list;
	struct qxl_device	*qdev;

	spinlock_t delayed_ops_lock;
	struct list_head delayed_ops;
	void *shadow;
	int size;

	/* dirty memory logging */
	struct {
		spinlock_t lock;
		bool active;
		unsigned x1;
		unsigned y1;
		unsigned x2;
		unsigned y2;
	} dirty;
};

static void qxl_fb_image_init(struct qxl_fb_image *qxl_fb_image,
			      struct qxl_device *qdev, struct fb_info *info,
			      const struct fb_image *image)
{
	qxl_fb_image->qdev = qdev;
	if (info) {
		qxl_fb_image->visual = info->fix.visual;
		if (qxl_fb_image->visual == FB_VISUAL_TRUECOLOR ||
		    qxl_fb_image->visual == FB_VISUAL_DIRECTCOLOR)
			memcpy(&qxl_fb_image->pseudo_palette,
			       info->pseudo_palette,
			       sizeof(qxl_fb_image->pseudo_palette));
	} else {
		 /* fallback */
		if (image->depth == 1)
			qxl_fb_image->visual = FB_VISUAL_MONO10;
		else
			qxl_fb_image->visual = FB_VISUAL_DIRECTCOLOR;
	}
	if (image) {
		memcpy(&qxl_fb_image->fb_image, image,
		       sizeof(qxl_fb_image->fb_image));
	}
}

static void qxl_fb_dirty_flush(struct fb_info *info)
{
	struct qxl_fbdev *qfbdev = info->par;
	struct qxl_device *qdev = qfbdev->qdev;
	struct qxl_fb_image qxl_fb_image;
	struct fb_image *image = &qxl_fb_image.fb_image;
	u32 x1, x2, y1, y2;

	/* TODO: hard coding 32 bpp */
	int stride = qfbdev->qfb.base.pitches[0];

	x1 = qfbdev->dirty.x1;
	x2 = qfbdev->dirty.x2;
	y1 = qfbdev->dirty.y1;
	y2 = qfbdev->dirty.y2;
	/*
	 * we are using a shadow draw buffer, at qdev->surface0_shadow
	 */
	qxl_io_log(qdev, "dirty x[%d, %d], y[%d, %d]", x1, x2, y1, y2);
	image->dx = x1;
	image->dy = y1;
	image->width = x2 - x1;
	image->height = y2 - y1;
	image->fg_color = 0xffffffff; /* unused, just to avoid uninitialized
					 warnings */
	image->bg_color = 0;
	image->depth = 32;	     /* TODO: take from somewhere? */
	image->cmap.start = 0;
	image->cmap.len = 0;
	image->cmap.red = NULL;
	image->cmap.green = NULL;
	image->cmap.blue = NULL;
	image->cmap.transp = NULL;
	image->data = qfbdev->shadow + (x1 * 4) + (stride * y1);

	qxl_fb_image_init(&qxl_fb_image, qdev, info, NULL);
	qxl_draw_opaque_fb(&qxl_fb_image, stride);
	qfbdev->dirty.x1 = 0;
	qfbdev->dirty.x2 = 0;
	qfbdev->dirty.y1 = 0;
	qfbdev->dirty.y2 = 0;
}

static void qxl_deferred_io(struct fb_info *info,
			    struct list_head *pagelist)
{
	struct qxl_fbdev *qfbdev = info->par;
	unsigned long start, end, min, max;
	struct page *page;
	int y1, y2;

	min = ULONG_MAX;
	max = 0;
	list_for_each_entry(page, pagelist, lru) {
		start = page->index << PAGE_SHIFT;
		end = start + PAGE_SIZE - 1;
		min = min(min, start);
		max = max(max, end);
	}

	if (min < max) {
		y1 = min / info->fix.line_length;
		y2 = (max / info->fix.line_length) + 1;

		/* TODO: add spin lock? */
		/* spin_lock_irqsave(&qfbdev->dirty.lock, flags); */
		qfbdev->dirty.x1 = 0;
		qfbdev->dirty.y1 = y1;
		qfbdev->dirty.x2 = info->var.xres;
		qfbdev->dirty.y2 = y2;
		/* spin_unlock_irqrestore(&qfbdev->dirty.lock, flags); */
	}

	qxl_fb_dirty_flush(info);
};


static struct fb_deferred_io qxl_defio = {
	.delay		= QXL_DIRTY_DELAY,
	.deferred_io	= qxl_deferred_io,
};

static void qxl_fb_delayed_fillrect(struct qxl_fbdev *qfbdev,
				    const struct fb_fillrect *fb_rect)
{
	struct qxl_fb_op *op;
	unsigned long flags;

	op = kmalloc(sizeof(struct qxl_fb_op), GFP_ATOMIC | __GFP_NOWARN);
	if (!op)
		return;

	op->op.fr = *fb_rect;
	op->img_data = NULL;
	op->op_type = QXL_FB_OP_FILLRECT;

	spin_lock_irqsave(&qfbdev->delayed_ops_lock, flags);
	list_add_tail(&op->head, &qfbdev->delayed_ops);
	spin_unlock_irqrestore(&qfbdev->delayed_ops_lock, flags);
}

static void qxl_fb_delayed_copyarea(struct qxl_fbdev *qfbdev,
				    const struct fb_copyarea *fb_copy)
{
	struct qxl_fb_op *op;
	unsigned long flags;

	op = kmalloc(sizeof(struct qxl_fb_op), GFP_ATOMIC | __GFP_NOWARN);
	if (!op)
		return;

	op->op.ca = *fb_copy;
	op->img_data = NULL;
	op->op_type = QXL_FB_OP_COPYAREA;

	spin_lock_irqsave(&qfbdev->delayed_ops_lock, flags);
	list_add_tail(&op->head, &qfbdev->delayed_ops);
	spin_unlock_irqrestore(&qfbdev->delayed_ops_lock, flags);
}

static void qxl_fb_delayed_imageblit(struct qxl_fbdev *qfbdev,
				     const struct fb_image *fb_image)
{
	struct qxl_fb_op *op;
	unsigned long flags;
	uint32_t size = fb_image->width * fb_image->height * (fb_image->depth >= 8 ? fb_image->depth / 8 : 1);

	op = kmalloc(sizeof(struct qxl_fb_op) + size, GFP_ATOMIC | __GFP_NOWARN);
	if (!op)
		return;

	op->op.ib = *fb_image;
	op->img_data = (void *)(op + 1);
	op->op_type = QXL_FB_OP_IMAGEBLIT;

	memcpy(op->img_data, fb_image->data, size);

	op->op.ib.data = op->img_data;
	spin_lock_irqsave(&qfbdev->delayed_ops_lock, flags);
	list_add_tail(&op->head, &qfbdev->delayed_ops);
	spin_unlock_irqrestore(&qfbdev->delayed_ops_lock, flags);
}

static void qxl_fb_fillrect_internal(struct fb_info *info,
				     const struct fb_fillrect *fb_rect)
{
	struct qxl_fbdev *qfbdev = info->par;
	struct qxl_device *qdev = qfbdev->qdev;
	struct qxl_rect rect;
	uint32_t color;
	int x = fb_rect->dx;
	int y = fb_rect->dy;
	int width = fb_rect->width;
	int height = fb_rect->height;
	uint16_t rop;
	struct qxl_draw_fill qxl_draw_fill_rec;

	if (info->fix.visual == FB_VISUAL_TRUECOLOR ||
	    info->fix.visual == FB_VISUAL_DIRECTCOLOR)
		color = ((u32 *) (info->pseudo_palette))[fb_rect->color];
	else
		color = fb_rect->color;
	rect.left = x;
	rect.right = x + width;
	rect.top = y;
	rect.bottom = y + height;
	switch (fb_rect->rop) {
	case ROP_XOR:
		rop = SPICE_ROPD_OP_XOR;
		break;
	case ROP_COPY:
		rop = SPICE_ROPD_OP_PUT;
		break;
	default:
		pr_err("qxl_fb_fillrect(): unknown rop, "
		       "defaulting to SPICE_ROPD_OP_PUT\n");
		rop = SPICE_ROPD_OP_PUT;
	}
	qxl_draw_fill_rec.qdev = qdev;
	qxl_draw_fill_rec.rect = rect;
	qxl_draw_fill_rec.color = color;
	qxl_draw_fill_rec.rop = rop;

	qxl_draw_fill(&qxl_draw_fill_rec);
}

static void qxl_fb_fillrect(struct fb_info *info,
			    const struct fb_fillrect *fb_rect)
{
	struct qxl_fbdev *qfbdev = info->par;
	struct qxl_device *qdev = qfbdev->qdev;

	if (!drm_can_sleep()) {
		qxl_fb_delayed_fillrect(qfbdev, fb_rect);
		schedule_work(&qdev->fb_work);
		return;
	}
	/* make sure any previous work is done */
	flush_work(&qdev->fb_work);
	qxl_fb_fillrect_internal(info, fb_rect);
}

static void qxl_fb_copyarea_internal(struct fb_info *info,
				     const struct fb_copyarea *region)
{
	struct qxl_fbdev *qfbdev = info->par;

	qxl_draw_copyarea(qfbdev->qdev,
			  region->width, region->height,
			  region->sx, region->sy,
			  region->dx, region->dy);
}

static void qxl_fb_copyarea(struct fb_info *info,
			    const struct fb_copyarea *region)
{
	struct qxl_fbdev *qfbdev = info->par;
	struct qxl_device *qdev = qfbdev->qdev;

	if (!drm_can_sleep()) {
		qxl_fb_delayed_copyarea(qfbdev, region);
		schedule_work(&qdev->fb_work);
		return;
	}
	/* make sure any previous work is done */
	flush_work(&qdev->fb_work);
	qxl_fb_copyarea_internal(info, region);
}

static void qxl_fb_imageblit_safe(struct qxl_fb_image *qxl_fb_image)
{
	qxl_draw_opaque_fb(qxl_fb_image, 0);
}

static void qxl_fb_imageblit_internal(struct fb_info *info,
				      const struct fb_image *image)
{
	struct qxl_fbdev *qfbdev = info->par;
	struct qxl_fb_image qxl_fb_image;

	/* ensure proper order  rendering operations - TODO: must do this
	 * for everything. */
	qxl_fb_image_init(&qxl_fb_image, qfbdev->qdev, info, image);
	qxl_fb_imageblit_safe(&qxl_fb_image);
}

static void qxl_fb_imageblit(struct fb_info *info,
			     const struct fb_image *image)
{
	struct qxl_fbdev *qfbdev = info->par;
	struct qxl_device *qdev = qfbdev->qdev;

	if (!drm_can_sleep()) {
		qxl_fb_delayed_imageblit(qfbdev, image);
		schedule_work(&qdev->fb_work);
		return;
	}
	/* make sure any previous work is done */
	flush_work(&qdev->fb_work);
	qxl_fb_imageblit_internal(info, image);
}

static void qxl_fb_work(struct work_struct *work)
{
	struct qxl_device *qdev = container_of(work, struct qxl_device, fb_work);
	unsigned long flags;
	struct qxl_fb_op *entry, *tmp;
	struct qxl_fbdev *qfbdev = qdev->mode_info.qfbdev;

	/* since the irq context just adds entries to the end of the
	   list dropping the lock should be fine, as entry isn't modified
	   in the operation code */
	spin_lock_irqsave(&qfbdev->delayed_ops_lock, flags);
	list_for_each_entry_safe(entry, tmp, &qfbdev->delayed_ops, head) {
		spin_unlock_irqrestore(&qfbdev->delayed_ops_lock, flags);
		switch (entry->op_type) {
		case QXL_FB_OP_FILLRECT:
			qxl_fb_fillrect_internal(qfbdev->helper.fbdev, &entry->op.fr);
			break;
		case QXL_FB_OP_COPYAREA:
			qxl_fb_copyarea_internal(qfbdev->helper.fbdev, &entry->op.ca);
			break;
		case QXL_FB_OP_IMAGEBLIT:
			qxl_fb_imageblit_internal(qfbdev->helper.fbdev, &entry->op.ib);
			break;
		}
		spin_lock_irqsave(&qfbdev->delayed_ops_lock, flags);
		list_del(&entry->head);
		kfree(entry);
	}
	spin_unlock_irqrestore(&qfbdev->delayed_ops_lock, flags);
}

int qxl_fb_init(struct qxl_device *qdev)
{
	INIT_WORK(&qdev->fb_work, qxl_fb_work);
	return 0;
}

static struct fb_ops qxlfb_ops = {
	.owner = THIS_MODULE,
	.fb_check_var = drm_fb_helper_check_var,
	.fb_set_par = drm_fb_helper_set_par, /* TODO: copy vmwgfx */
	.fb_fillrect = qxl_fb_fillrect,
	.fb_copyarea = qxl_fb_copyarea,
	.fb_imageblit = qxl_fb_imageblit,
	.fb_pan_display = drm_fb_helper_pan_display,
	.fb_blank = drm_fb_helper_blank,
	.fb_setcmap = drm_fb_helper_setcmap,
	.fb_debug_enter = drm_fb_helper_debug_enter,
	.fb_debug_leave = drm_fb_helper_debug_leave,
};

static void qxlfb_destroy_pinned_object(struct drm_gem_object *gobj)
{
	struct qxl_bo *qbo = gem_to_qxl_bo(gobj);
	int ret;

	ret = qxl_bo_reserve(qbo, false);
	if (likely(ret == 0)) {
		qxl_bo_kunmap(qbo);
		qxl_bo_unpin(qbo);
		qxl_bo_unreserve(qbo);
	}
	drm_gem_object_unreference_unlocked(gobj);
}

int qxl_get_handle_for_primary_fb(struct qxl_device *qdev,
				  struct drm_file *file_priv,
				  uint32_t *handle)
{
	int r;
	struct drm_gem_object *gobj = qdev->fbdev_qfb->obj;

	BUG_ON(!gobj);
	/* drm_get_handle_create adds a reference - good */
	r = drm_gem_handle_create(file_priv, gobj, handle);
	if (r)
		return r;
	return 0;
}

static int qxlfb_create_pinned_object(struct qxl_fbdev *qfbdev,
				      struct drm_mode_fb_cmd2 *mode_cmd,
				      struct drm_gem_object **gobj_p)
{
	struct qxl_device *qdev = qfbdev->qdev;
	struct drm_gem_object *gobj = NULL;
	struct qxl_bo *qbo = NULL;
	int ret;
	int aligned_size, size;
	int height = mode_cmd->height;
	int bpp;
	int depth;

	drm_fb_get_bpp_depth(mode_cmd->pixel_format, &bpp, &depth);

	size = mode_cmd->pitches[0] * height;
	aligned_size = ALIGN(size, PAGE_SIZE);
	/* TODO: unallocate and reallocate surface0 for real. Hack to just
	 * have a large enough surface0 for 1024x768 Xorg 32bpp mode */
	ret = qxl_gem_object_create(qdev, aligned_size, 0,
				    QXL_GEM_DOMAIN_SURFACE,
				    false, /* is discardable */
				    false, /* is kernel (false means device) */
				    NULL,
				    &gobj);
	if (ret) {
		pr_err("failed to allocate framebuffer (%d)\n",
		       aligned_size);
		return -ENOMEM;
	}
	qbo = gem_to_qxl_bo(gobj);

	qbo->surf.width = mode_cmd->width;
	qbo->surf.height = mode_cmd->height;
	qbo->surf.stride = mode_cmd->pitches[0];
	qbo->surf.format = SPICE_SURFACE_FMT_32_xRGB;
	ret = qxl_bo_reserve(qbo, false);
	if (unlikely(ret != 0))
		goto out_unref;
	ret = qxl_bo_pin(qbo, QXL_GEM_DOMAIN_SURFACE, NULL);
	if (ret) {
		qxl_bo_unreserve(qbo);
		goto out_unref;
	}
	ret = qxl_bo_kmap(qbo, NULL);
	qxl_bo_unreserve(qbo); /* unreserve, will be mmaped */
	if (ret)
		goto out_unref;

	*gobj_p = gobj;
	return 0;
out_unref:
	qxlfb_destroy_pinned_object(gobj);
	*gobj_p = NULL;
	return ret;
}

static int qxlfb_create(struct qxl_fbdev *qfbdev,
			struct drm_fb_helper_surface_size *sizes)
{
	struct qxl_device *qdev = qfbdev->qdev;
	struct fb_info *info;
	struct drm_framebuffer *fb = NULL;
	struct drm_mode_fb_cmd2 mode_cmd;
	struct drm_gem_object *gobj = NULL;
	struct qxl_bo *qbo = NULL;
	struct device *device = &qdev->pdev->dev;
	int ret;
	int size;
	int bpp = sizes->surface_bpp;
	int depth = sizes->surface_depth;
	void *shadow;

	mode_cmd.width = sizes->surface_width;
	mode_cmd.height = sizes->surface_height;

	mode_cmd.pitches[0] = ALIGN(mode_cmd.width * ((bpp + 1) / 8), 64);
	mode_cmd.pixel_format = drm_mode_legacy_fb_format(bpp, depth);

	ret = qxlfb_create_pinned_object(qfbdev, &mode_cmd, &gobj);
	qbo = gem_to_qxl_bo(gobj);
	QXL_INFO(qdev, "%s: %dx%d %d\n", __func__, mode_cmd.width,
		 mode_cmd.height, mode_cmd.pitches[0]);

	shadow = vmalloc(mode_cmd.pitches[0] * mode_cmd.height);
	/* TODO: what's the usual response to memory allocation errors? */
	BUG_ON(!shadow);
	QXL_INFO(qdev,
	"surface0 at gpu offset %lld, mmap_offset %lld (virt %p, shadow %p)\n",
		 qxl_bo_gpu_offset(qbo),
		 qxl_bo_mmap_offset(qbo),
		 qbo->kptr,
		 shadow);
	size = mode_cmd.pitches[0] * mode_cmd.height;

	info = framebuffer_alloc(0, device);
	if (info == NULL) {
		ret = -ENOMEM;
		goto out_unref;
	}

	info->par = qfbdev;

	qxl_framebuffer_init(qdev->ddev, &qfbdev->qfb, &mode_cmd, gobj);

	fb = &qfbdev->qfb.base;

	/* setup helper with fb data */
	qfbdev->helper.fb = fb;
	qfbdev->helper.fbdev = info;
	qfbdev->shadow = shadow;
	strcpy(info->fix.id, "qxldrmfb");

	drm_fb_helper_fill_fix(info, fb->pitches[0], fb->depth);

	info->flags = FBINFO_DEFAULT | FBINFO_HWACCEL_COPYAREA | FBINFO_HWACCEL_FILLRECT;
	info->fbops = &qxlfb_ops;

	/*
	 * TODO: using gobj->size in various places in this function. Not sure
	 * what the difference between the different sizes is.
	 */
	info->fix.smem_start = qdev->vram_base; /* TODO - correct? */
	info->fix.smem_len = gobj->size;
	info->screen_base = qfbdev->shadow;
	info->screen_size = gobj->size;

	drm_fb_helper_fill_var(info, &qfbdev->helper, sizes->fb_width,
			       sizes->fb_height);

	/* setup aperture base/size for vesafb takeover */
	info->apertures = alloc_apertures(1);
	if (!info->apertures) {
		ret = -ENOMEM;
		goto out_unref;
	}
	info->apertures->ranges[0].base = qdev->ddev->mode_config.fb_base;
	info->apertures->ranges[0].size = qdev->vram_size;

	info->fix.mmio_start = 0;
	info->fix.mmio_len = 0;

	if (info->screen_base == NULL) {
		ret = -ENOSPC;
		goto out_unref;
	}

	ret = fb_alloc_cmap(&info->cmap, 256, 0);
	if (ret) {
		ret = -ENOMEM;
		goto out_unref;
	}

	info->fbdefio = &qxl_defio;
	fb_deferred_io_init(info);

	qdev->fbdev_info = info;
	qdev->fbdev_qfb = &qfbdev->qfb;
	DRM_INFO("fb mappable at 0x%lX, size %lu\n",  info->fix.smem_start, (unsigned long)info->screen_size);
	DRM_INFO("fb: depth %d, pitch %d, width %d, height %d\n", fb->depth, fb->pitches[0], fb->width, fb->height);
	return 0;

out_unref:
	if (qbo) {
		ret = qxl_bo_reserve(qbo, false);
		if (likely(ret == 0)) {
			qxl_bo_kunmap(qbo);
			qxl_bo_unpin(qbo);
			qxl_bo_unreserve(qbo);
		}
	}
	if (fb && ret) {
		drm_gem_object_unreference(gobj);
		drm_framebuffer_cleanup(fb);
		kfree(fb);
	}
	drm_gem_object_unreference(gobj);
	return ret;
}

static int qxl_fb_find_or_create_single(
		struct drm_fb_helper *helper,
		struct drm_fb_helper_surface_size *sizes)
{
	struct qxl_fbdev *qfbdev =
		container_of(helper, struct qxl_fbdev, helper);
	int new_fb = 0;
	int ret;

	if (!helper->fb) {
		ret = qxlfb_create(qfbdev, sizes);
		if (ret)
			return ret;
		new_fb = 1;
	}
	return new_fb;
}

static int qxl_fbdev_destroy(struct drm_device *dev, struct qxl_fbdev *qfbdev)
{
	struct fb_info *info;
	struct qxl_framebuffer *qfb = &qfbdev->qfb;

	if (qfbdev->helper.fbdev) {
		info = qfbdev->helper.fbdev;

		unregister_framebuffer(info);
		framebuffer_release(info);
	}
	if (qfb->obj) {
		qxlfb_destroy_pinned_object(qfb->obj);
		qfb->obj = NULL;
	}
	drm_fb_helper_fini(&qfbdev->helper);
	vfree(qfbdev->shadow);
	drm_framebuffer_cleanup(&qfb->base);

	return 0;
}

static const struct drm_fb_helper_funcs qxl_fb_helper_funcs = {
	.fb_probe = qxl_fb_find_or_create_single,
};

int qxl_fbdev_init(struct qxl_device *qdev)
{
	struct qxl_fbdev *qfbdev;
	int bpp_sel = 32; /* TODO: parameter from somewhere? */
	int ret;

	qfbdev = kzalloc(sizeof(struct qxl_fbdev), GFP_KERNEL);
	if (!qfbdev)
		return -ENOMEM;

	qfbdev->qdev = qdev;
	qdev->mode_info.qfbdev = qfbdev;
	spin_lock_init(&qfbdev->delayed_ops_lock);
	INIT_LIST_HEAD(&qfbdev->delayed_ops);

	drm_fb_helper_prepare(qdev->ddev, &qfbdev->helper,
			      &qxl_fb_helper_funcs);

	ret = drm_fb_helper_init(qdev->ddev, &qfbdev->helper,
				 qxl_num_crtc /* num_crtc - QXL supports just 1 */,
				 QXLFB_CONN_LIMIT);
	if (ret)
		goto free;

	ret = drm_fb_helper_single_add_all_connectors(&qfbdev->helper);
	if (ret)
		goto fini;

	ret = drm_fb_helper_initial_config(&qfbdev->helper, bpp_sel);
	if (ret)
		goto fini;

	return 0;

fini:
	drm_fb_helper_fini(&qfbdev->helper);
free:
	kfree(qfbdev);
	return ret;
}

void qxl_fbdev_fini(struct qxl_device *qdev)
{
	if (!qdev->mode_info.qfbdev)
		return;

	qxl_fbdev_destroy(qdev->ddev, qdev->mode_info.qfbdev);
	kfree(qdev->mode_info.qfbdev);
	qdev->mode_info.qfbdev = NULL;
}

void qxl_fbdev_set_suspend(struct qxl_device *qdev, int state)
{
	fb_set_suspend(qdev->mode_info.qfbdev->helper.fbdev, state);
}

bool qxl_fbdev_qobj_is_fb(struct qxl_device *qdev, struct qxl_bo *qobj)
{
	if (qobj == gem_to_qxl_bo(qdev->mode_info.qfbdev->qfb.obj))
		return true;
	return false;
}