summaryrefslogtreecommitdiff
path: root/drivers/gpu/drm/exynos/exynos_drm_ipp.c
blob: b435db8fc91677927c6e735d78d99232d7a91e0e (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
909
910
911
912
913
914
915
916
917
918
919
920
921
922
/*
 * Copyright (C) 2017 Samsung Electronics Co.Ltd
 * Authors:
 *	Marek Szyprowski <m.szyprowski@samsung.com>
 *
 * Exynos DRM Image Post Processing (IPP) related functions
 *
 * 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 shall be included in
 * all copies or substantial portions of the Software.
 */


#include <drm/drmP.h>
#include <drm/drm_mode.h>
#include <uapi/drm/exynos_drm.h>

#include "exynos_drm_drv.h"
#include "exynos_drm_gem.h"
#include "exynos_drm_ipp.h"

static int num_ipp;
static LIST_HEAD(ipp_list);

/**
 * exynos_drm_ipp_register - Register a new picture processor hardware module
 * @dev: DRM device
 * @ipp: ipp module to init
 * @funcs: callbacks for the new ipp object
 * @caps: bitmask of ipp capabilities (%DRM_EXYNOS_IPP_CAP_*)
 * @formats: array of supported formats
 * @num_formats: size of the supported formats array
 * @name: name (for debugging purposes)
 *
 * Initializes a ipp module.
 *
 * Returns:
 * Zero on success, error code on failure.
 */
int exynos_drm_ipp_register(struct drm_device *dev, struct exynos_drm_ipp *ipp,
		const struct exynos_drm_ipp_funcs *funcs, unsigned int caps,
		const struct exynos_drm_ipp_formats *formats,
		unsigned int num_formats, const char *name)
{
	WARN_ON(!ipp);
	WARN_ON(!funcs);
	WARN_ON(!formats);
	WARN_ON(!num_formats);

	spin_lock_init(&ipp->lock);
	INIT_LIST_HEAD(&ipp->todo_list);
	init_waitqueue_head(&ipp->done_wq);
	ipp->dev = dev;
	ipp->funcs = funcs;
	ipp->capabilities = caps;
	ipp->name = name;
	ipp->formats = formats;
	ipp->num_formats = num_formats;

	/* ipp_list modification is serialized by component framework */
	list_add_tail(&ipp->head, &ipp_list);
	ipp->id = num_ipp++;

	DRM_DEBUG_DRIVER("Registered ipp %d\n", ipp->id);

	return 0;
}

/**
 * exynos_drm_ipp_unregister - Unregister the picture processor module
 * @dev: DRM device
 * @ipp: ipp module
 */
void exynos_drm_ipp_unregister(struct drm_device *dev,
			       struct exynos_drm_ipp *ipp)
{
	WARN_ON(ipp->task);
	WARN_ON(!list_empty(&ipp->todo_list));
	list_del(&ipp->head);
}

/**
 * exynos_drm_ipp_ioctl_get_res_ioctl - enumerate all ipp modules
 * @dev: DRM device
 * @data: ioctl data
 * @file_priv: DRM file info
 *
 * Construct a list of ipp ids.
 *
 * Called by the user via ioctl.
 *
 * Returns:
 * Zero on success, negative errno on failure.
 */
int exynos_drm_ipp_get_res_ioctl(struct drm_device *dev, void *data,
				 struct drm_file *file_priv)
{
	struct drm_exynos_ioctl_ipp_get_res *resp = data;
	struct exynos_drm_ipp *ipp;
	uint32_t __user *ipp_ptr = (uint32_t __user *)
						(unsigned long)resp->ipp_id_ptr;
	unsigned int count = num_ipp, copied = 0;

	/*
	 * This ioctl is called twice, once to determine how much space is
	 * needed, and the 2nd time to fill it.
	 */
	if (count && resp->count_ipps >= count) {
		list_for_each_entry(ipp, &ipp_list, head) {
			if (put_user(ipp->id, ipp_ptr + copied))
				return -EFAULT;
			copied++;
		}
	}
	resp->count_ipps = count;

	return 0;
}

static inline struct exynos_drm_ipp *__ipp_get(uint32_t id)
{
	struct exynos_drm_ipp *ipp;

	list_for_each_entry(ipp, &ipp_list, head)
		if (ipp->id == id)
			return ipp;
	return NULL;
}

/**
 * exynos_drm_ipp_ioctl_get_caps - get ipp module capabilities and formats
 * @dev: DRM device
 * @data: ioctl data
 * @file_priv: DRM file info
 *
 * Construct a structure describing ipp module capabilities.
 *
 * Called by the user via ioctl.
 *
 * Returns:
 * Zero on success, negative errno on failure.
 */
int exynos_drm_ipp_get_caps_ioctl(struct drm_device *dev, void *data,
				  struct drm_file *file_priv)
{
	struct drm_exynos_ioctl_ipp_get_caps *resp = data;
	void __user *ptr = (void __user *)(unsigned long)resp->formats_ptr;
	struct exynos_drm_ipp *ipp;
	int i;

	ipp = __ipp_get(resp->ipp_id);
	if (!ipp)
		return -ENOENT;

	resp->ipp_id = ipp->id;
	resp->capabilities = ipp->capabilities;

	/*
	 * This ioctl is called twice, once to determine how much space is
	 * needed, and the 2nd time to fill it.
	 */
	if (resp->formats_count >= ipp->num_formats) {
		for (i = 0; i < ipp->num_formats; i++) {
			struct drm_exynos_ipp_format tmp = {
				.fourcc = ipp->formats[i].fourcc,
				.type = ipp->formats[i].type,
				.modifier = ipp->formats[i].modifier,
			};

			if (copy_to_user(ptr, &tmp, sizeof(tmp)))
				return -EFAULT;
			ptr += sizeof(tmp);
		}
	}
	resp->formats_count = ipp->num_formats;

	return 0;
}

static inline const struct exynos_drm_ipp_formats *__ipp_format_get(
				struct exynos_drm_ipp *ipp, uint32_t fourcc,
				uint64_t mod, unsigned int type)
{
	int i;

	for (i = 0; i < ipp->num_formats; i++) {
		if ((ipp->formats[i].type & type) &&
		    ipp->formats[i].fourcc == fourcc &&
		    ipp->formats[i].modifier == mod)
			return &ipp->formats[i];
	}
	return NULL;
}

/**
 * exynos_drm_ipp_get_limits_ioctl - get ipp module limits
 * @dev: DRM device
 * @data: ioctl data
 * @file_priv: DRM file info
 *
 * Construct a structure describing ipp module limitations for provided
 * picture format.
 *
 * Called by the user via ioctl.
 *
 * Returns:
 * Zero on success, negative errno on failure.
 */
int exynos_drm_ipp_get_limits_ioctl(struct drm_device *dev, void *data,
				    struct drm_file *file_priv)
{
	struct drm_exynos_ioctl_ipp_get_limits *resp = data;
	void __user *ptr = (void __user *)(unsigned long)resp->limits_ptr;
	const struct exynos_drm_ipp_formats *format;
	struct exynos_drm_ipp *ipp;

	if (resp->type != DRM_EXYNOS_IPP_FORMAT_SOURCE &&
	    resp->type != DRM_EXYNOS_IPP_FORMAT_DESTINATION)
		return -EINVAL;

	ipp = __ipp_get(resp->ipp_id);
	if (!ipp)
		return -ENOENT;

	format = __ipp_format_get(ipp, resp->fourcc, resp->modifier,
				  resp->type);
	if (!format)
		return -EINVAL;

	/*
	 * This ioctl is called twice, once to determine how much space is
	 * needed, and the 2nd time to fill it.
	 */
	if (format->num_limits && resp->limits_count >= format->num_limits)
		if (copy_to_user((void __user *)ptr, format->limits,
				 sizeof(*format->limits) * format->num_limits))
			return -EFAULT;
	resp->limits_count = format->num_limits;

	return 0;
}

struct drm_pending_exynos_ipp_event {
	struct drm_pending_event base;
	struct drm_exynos_ipp_event event;
};

static inline struct exynos_drm_ipp_task *
			exynos_drm_ipp_task_alloc(struct exynos_drm_ipp *ipp)
{
	struct exynos_drm_ipp_task *task;

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

	task->dev = ipp->dev;
	task->ipp = ipp;

	/* some defaults */
	task->src.rect.w = task->dst.rect.w = UINT_MAX;
	task->src.rect.h = task->dst.rect.h = UINT_MAX;
	task->transform.rotation = DRM_MODE_ROTATE_0;

	DRM_DEBUG_DRIVER("Allocated task %pK\n", task);

	return task;
}

static const struct exynos_drm_param_map {
	unsigned int id;
	unsigned int size;
	unsigned int offset;
} exynos_drm_ipp_params_maps[] = {
	{
		DRM_EXYNOS_IPP_TASK_BUFFER | DRM_EXYNOS_IPP_TASK_TYPE_SOURCE,
		sizeof(struct drm_exynos_ipp_task_buffer),
		offsetof(struct exynos_drm_ipp_task, src.buf),
	}, {
		DRM_EXYNOS_IPP_TASK_BUFFER |
			DRM_EXYNOS_IPP_TASK_TYPE_DESTINATION,
		sizeof(struct drm_exynos_ipp_task_buffer),
		offsetof(struct exynos_drm_ipp_task, dst.buf),
	}, {
		DRM_EXYNOS_IPP_TASK_RECTANGLE | DRM_EXYNOS_IPP_TASK_TYPE_SOURCE,
		sizeof(struct drm_exynos_ipp_task_rect),
		offsetof(struct exynos_drm_ipp_task, src.rect),
	}, {
		DRM_EXYNOS_IPP_TASK_RECTANGLE |
			DRM_EXYNOS_IPP_TASK_TYPE_DESTINATION,
		sizeof(struct drm_exynos_ipp_task_rect),
		offsetof(struct exynos_drm_ipp_task, dst.rect),
	}, {
		DRM_EXYNOS_IPP_TASK_TRANSFORM,
		sizeof(struct drm_exynos_ipp_task_transform),
		offsetof(struct exynos_drm_ipp_task, transform),
	}, {
		DRM_EXYNOS_IPP_TASK_ALPHA,
		sizeof(struct drm_exynos_ipp_task_alpha),
		offsetof(struct exynos_drm_ipp_task, alpha),
	},
};

static int exynos_drm_ipp_task_set(struct exynos_drm_ipp_task *task,
				   struct drm_exynos_ioctl_ipp_commit *arg)
{
	const struct exynos_drm_param_map *map = exynos_drm_ipp_params_maps;
	void __user *params = (void __user *)(unsigned long)arg->params_ptr;
	unsigned int size = arg->params_size;
	uint32_t id;
	int i;

	while (size) {
		if (get_user(id, (uint32_t __user *)params))
			return -EFAULT;

		for (i = 0; i < ARRAY_SIZE(exynos_drm_ipp_params_maps); i++)
			if (map[i].id == id)
				break;
		if (i == ARRAY_SIZE(exynos_drm_ipp_params_maps) ||
		    map[i].size > size)
			return -EINVAL;

		if (copy_from_user((void *)task + map[i].offset, params,
				   map[i].size))
			return -EFAULT;

		params += map[i].size;
		size -= map[i].size;
	}

	DRM_DEBUG_DRIVER("Got task %pK configuration from userspace\n", task);
	return 0;
}

static int exynos_drm_ipp_task_setup_buffer(struct exynos_drm_ipp_buffer *buf,
					    struct drm_file *filp)
{
	int ret = 0;
	int i;

	/* get GEM buffers and check their size */
	for (i = 0; i < buf->format->num_planes; i++) {
		unsigned int height = (i == 0) ? buf->buf.height :
			     DIV_ROUND_UP(buf->buf.height, buf->format->vsub);
		unsigned long size = height * buf->buf.pitch[i];
		struct drm_gem_object *obj = drm_gem_object_lookup(filp,
							    buf->buf.gem_id[i]);
		if (!obj) {
			ret = -ENOENT;
			goto gem_free;
		}
		buf->exynos_gem[i] = to_exynos_gem(obj);

		if (size + buf->buf.offset[i] > buf->exynos_gem[i]->size) {
			i++;
			ret = -EINVAL;
			goto gem_free;
		}
		buf->dma_addr[i] = buf->exynos_gem[i]->dma_addr +
				   buf->buf.offset[i];
	}

	return 0;
gem_free:
	while (i--) {
		drm_gem_object_put_unlocked(&buf->exynos_gem[i]->base);
		buf->exynos_gem[i] = NULL;
	}
	return ret;
}

static void exynos_drm_ipp_task_release_buf(struct exynos_drm_ipp_buffer *buf)
{
	int i;

	if (!buf->exynos_gem[0])
		return;
	for (i = 0; i < buf->format->num_planes; i++)
		drm_gem_object_put_unlocked(&buf->exynos_gem[i]->base);
}

static void exynos_drm_ipp_task_free(struct exynos_drm_ipp *ipp,
				 struct exynos_drm_ipp_task *task)
{
	DRM_DEBUG_DRIVER("Freeing task %pK\n", task);

	exynos_drm_ipp_task_release_buf(&task->src);
	exynos_drm_ipp_task_release_buf(&task->dst);
	if (task->event)
		drm_event_cancel_free(ipp->dev, &task->event->base);
	kfree(task);
}

struct drm_ipp_limit {
	struct drm_exynos_ipp_limit_val h;
	struct drm_exynos_ipp_limit_val v;
};

enum drm_ipp_size_id {
	IPP_LIMIT_BUFFER, IPP_LIMIT_AREA, IPP_LIMIT_ROTATED, IPP_LIMIT_MAX
};

static const enum drm_exynos_ipp_limit_type limit_id_fallback[IPP_LIMIT_MAX][4] = {
	[IPP_LIMIT_BUFFER]  = { DRM_EXYNOS_IPP_LIMIT_SIZE_BUFFER },
	[IPP_LIMIT_AREA]    = { DRM_EXYNOS_IPP_LIMIT_SIZE_AREA,
				DRM_EXYNOS_IPP_LIMIT_SIZE_BUFFER },
	[IPP_LIMIT_ROTATED] = { DRM_EXYNOS_IPP_LIMIT_SIZE_ROTATED,
				DRM_EXYNOS_IPP_LIMIT_SIZE_AREA,
				DRM_EXYNOS_IPP_LIMIT_SIZE_BUFFER },
};

static inline void __limit_set_val(unsigned int *ptr, unsigned int val)
{
	if (!*ptr)
		*ptr = val;
}

static void __get_size_limit(const struct drm_exynos_ipp_limit *limits,
			     unsigned int num_limits, enum drm_ipp_size_id id,
			     struct drm_ipp_limit *res)
{
	const struct drm_exynos_ipp_limit *l = limits;
	int i = 0;

	memset(res, 0, sizeof(*res));
	for (i = 0; limit_id_fallback[id][i]; i++)
		for (l = limits; l - limits < num_limits; l++) {
			if (((l->type & DRM_EXYNOS_IPP_LIMIT_TYPE_MASK) !=
			      DRM_EXYNOS_IPP_LIMIT_TYPE_SIZE) ||
			    ((l->type & DRM_EXYNOS_IPP_LIMIT_SIZE_MASK) !=
						     limit_id_fallback[id][i]))
				continue;
			__limit_set_val(&res->h.min, l->h.min);
			__limit_set_val(&res->h.max, l->h.max);
			__limit_set_val(&res->h.align, l->h.align);
			__limit_set_val(&res->v.min, l->v.min);
			__limit_set_val(&res->v.max, l->v.max);
			__limit_set_val(&res->v.align, l->v.align);
		}
}

static inline bool __align_check(unsigned int val, unsigned int align)
{
	if (align && (val & (align - 1))) {
		DRM_DEBUG_DRIVER("Value %d exceeds HW limits (align %d)\n",
				 val, align);
		return false;
	}
	return true;
}

static inline bool __size_limit_check(unsigned int val,
				 struct drm_exynos_ipp_limit_val *l)
{
	if ((l->min && val < l->min) || (l->max && val > l->max)) {
		DRM_DEBUG_DRIVER("Value %d exceeds HW limits (min %d, max %d)\n",
				 val, l->min, l->max);
		return false;
	}
	return __align_check(val, l->align);
}

static int exynos_drm_ipp_check_size_limits(struct exynos_drm_ipp_buffer *buf,
	const struct drm_exynos_ipp_limit *limits, unsigned int num_limits,
	bool rotate, bool swap)
{
	enum drm_ipp_size_id id = rotate ? IPP_LIMIT_ROTATED : IPP_LIMIT_AREA;
	struct drm_ipp_limit l;
	struct drm_exynos_ipp_limit_val *lh = &l.h, *lv = &l.v;
	int real_width = buf->buf.pitch[0] / buf->format->cpp[0];

	if (!limits)
		return 0;

	__get_size_limit(limits, num_limits, IPP_LIMIT_BUFFER, &l);
	if (!__size_limit_check(real_width, &l.h) ||
	    !__size_limit_check(buf->buf.height, &l.v))
		return -EINVAL;

	if (swap) {
		lv = &l.h;
		lh = &l.v;
	}
	__get_size_limit(limits, num_limits, id, &l);
	if (!__size_limit_check(buf->rect.w, lh) ||
	    !__align_check(buf->rect.x, lh->align) ||
	    !__size_limit_check(buf->rect.h, lv) ||
	    !__align_check(buf->rect.y, lv->align))
		return -EINVAL;

	return 0;
}

static inline bool __scale_limit_check(unsigned int src, unsigned int dst,
				       unsigned int min, unsigned int max)
{
	if ((max && (dst << 16) > src * max) ||
	    (min && (dst << 16) < src * min)) {
		DRM_DEBUG_DRIVER("Scale from %d to %d exceeds HW limits (ratio min %d.%05d, max %d.%05d)\n",
			 src, dst,
			 min >> 16, 100000 * (min & 0xffff) / (1 << 16),
			 max >> 16, 100000 * (max & 0xffff) / (1 << 16));
		return false;
	}
	return true;
}

static int exynos_drm_ipp_check_scale_limits(
				struct drm_exynos_ipp_task_rect *src,
				struct drm_exynos_ipp_task_rect *dst,
				const struct drm_exynos_ipp_limit *limits,
				unsigned int num_limits, bool swap)
{
	const struct drm_exynos_ipp_limit_val *lh, *lv;
	int dw, dh;

	for (; num_limits; limits++, num_limits--)
		if ((limits->type & DRM_EXYNOS_IPP_LIMIT_TYPE_MASK) ==
		    DRM_EXYNOS_IPP_LIMIT_TYPE_SCALE)
			break;
	if (!num_limits)
		return 0;

	lh = (!swap) ? &limits->h : &limits->v;
	lv = (!swap) ? &limits->v : &limits->h;
	dw = (!swap) ? dst->w : dst->h;
	dh = (!swap) ? dst->h : dst->w;

	if (!__scale_limit_check(src->w, dw, lh->min, lh->max) ||
	    !__scale_limit_check(src->h, dh, lv->min, lv->max))
		return -EINVAL;

	return 0;
}

static int exynos_drm_ipp_check_format(struct exynos_drm_ipp_task *task,
				       struct exynos_drm_ipp_buffer *buf,
				       struct exynos_drm_ipp_buffer *src,
				       struct exynos_drm_ipp_buffer *dst,
				       bool rotate, bool swap)
{
	const struct exynos_drm_ipp_formats *fmt;
	int ret, i;

	fmt = __ipp_format_get(task->ipp, buf->buf.fourcc, buf->buf.modifier,
			       buf == src ? DRM_EXYNOS_IPP_FORMAT_SOURCE :
					    DRM_EXYNOS_IPP_FORMAT_DESTINATION);
	if (!fmt) {
		DRM_DEBUG_DRIVER("Task %pK: %s format not supported\n", task,
				 buf == src ? "src" : "dst");
		return -EINVAL;
	}

	/* basic checks */
	if (buf->buf.width == 0 || buf->buf.height == 0)
		return -EINVAL;

	buf->format = drm_format_info(buf->buf.fourcc);
	for (i = 0; i < buf->format->num_planes; i++) {
		unsigned int width = (i == 0) ? buf->buf.width :
			     DIV_ROUND_UP(buf->buf.width, buf->format->hsub);

		if (buf->buf.pitch[i] == 0)
			buf->buf.pitch[i] = width * buf->format->cpp[i];
		if (buf->buf.pitch[i] < width * buf->format->cpp[i])
			return -EINVAL;
		if (!buf->buf.gem_id[i])
			return -ENOENT;
	}

	/* pitch for additional planes must match */
	if (buf->format->num_planes > 2 &&
	    buf->buf.pitch[1] != buf->buf.pitch[2])
		return -EINVAL;

	/* check driver limits */
	ret = exynos_drm_ipp_check_size_limits(buf, fmt->limits,
					       fmt->num_limits,
					       rotate,
					       buf == dst ? swap : false);
	if (ret)
		return ret;
	ret = exynos_drm_ipp_check_scale_limits(&src->rect, &dst->rect,
						fmt->limits,
						fmt->num_limits, swap);
	return ret;
}

static int exynos_drm_ipp_task_check(struct exynos_drm_ipp_task *task)
{
	struct exynos_drm_ipp *ipp = task->ipp;
	struct exynos_drm_ipp_buffer *src = &task->src, *dst = &task->dst;
	unsigned int rotation = task->transform.rotation;
	int ret = 0;
	bool swap = drm_rotation_90_or_270(rotation);
	bool rotate = (rotation != DRM_MODE_ROTATE_0);
	bool scale = false;

	DRM_DEBUG_DRIVER("Checking task %pK\n", task);

	if (src->rect.w == UINT_MAX)
		src->rect.w = src->buf.width;
	if (src->rect.h == UINT_MAX)
		src->rect.h = src->buf.height;
	if (dst->rect.w == UINT_MAX)
		dst->rect.w = dst->buf.width;
	if (dst->rect.h == UINT_MAX)
		dst->rect.h = dst->buf.height;

	if (src->rect.x + src->rect.w > (src->buf.width) ||
	    src->rect.y + src->rect.h > (src->buf.height) ||
	    dst->rect.x + dst->rect.w > (dst->buf.width) ||
	    dst->rect.y + dst->rect.h > (dst->buf.height)) {
		DRM_DEBUG_DRIVER("Task %pK: defined area is outside provided buffers\n",
				 task);
		return -EINVAL;
	}

	if ((!swap && (src->rect.w != dst->rect.w ||
		       src->rect.h != dst->rect.h)) ||
	    (swap && (src->rect.w != dst->rect.h ||
		      src->rect.h != dst->rect.w)))
		scale = true;

	if ((!(ipp->capabilities & DRM_EXYNOS_IPP_CAP_CROP) &&
	     (src->rect.x || src->rect.y || dst->rect.x || dst->rect.y)) ||
	    (!(ipp->capabilities & DRM_EXYNOS_IPP_CAP_ROTATE) && rotate) ||
	    (!(ipp->capabilities & DRM_EXYNOS_IPP_CAP_SCALE) && scale) ||
	    (!(ipp->capabilities & DRM_EXYNOS_IPP_CAP_CONVERT) &&
	     src->buf.fourcc != dst->buf.fourcc)) {
		DRM_DEBUG_DRIVER("Task %pK: hw capabilities exceeded\n", task);
		return -EINVAL;
	}

	ret = exynos_drm_ipp_check_format(task, src, src, dst, rotate, swap);
	if (ret)
		return ret;

	ret = exynos_drm_ipp_check_format(task, dst, src, dst, false, swap);
	if (ret)
		return ret;

	DRM_DEBUG_DRIVER("Task %pK: all checks done.\n", task);

	return ret;
}

static int exynos_drm_ipp_task_setup_buffers(struct exynos_drm_ipp_task *task,
				     struct drm_file *filp)
{
	struct exynos_drm_ipp_buffer *src = &task->src, *dst = &task->dst;
	int ret = 0;

	DRM_DEBUG_DRIVER("Setting buffer for task %pK\n", task);

	ret = exynos_drm_ipp_task_setup_buffer(src, filp);
	if (ret) {
		DRM_DEBUG_DRIVER("Task %pK: src buffer setup failed\n", task);
		return ret;
	}
	ret = exynos_drm_ipp_task_setup_buffer(dst, filp);
	if (ret) {
		DRM_DEBUG_DRIVER("Task %pK: dst buffer setup failed\n", task);
		return ret;
	}

	DRM_DEBUG_DRIVER("Task %pK: buffers prepared.\n", task);

	return ret;
}


static int exynos_drm_ipp_event_create(struct exynos_drm_ipp_task *task,
				 struct drm_file *file_priv, uint64_t user_data)
{
	struct drm_pending_exynos_ipp_event *e = NULL;
	int ret;

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

	e->event.base.type = DRM_EXYNOS_IPP_EVENT;
	e->event.base.length = sizeof(e->event);
	e->event.user_data = user_data;

	ret = drm_event_reserve_init(task->dev, file_priv, &e->base,
				     &e->event.base);
	if (ret)
		goto free;

	task->event = e;
	return 0;
free:
	kfree(e);
	return ret;
}

static void exynos_drm_ipp_event_send(struct exynos_drm_ipp_task *task)
{
	struct timespec64 now;

	ktime_get_ts64(&now);
	task->event->event.tv_sec = now.tv_sec;
	task->event->event.tv_usec = now.tv_nsec / NSEC_PER_USEC;
	task->event->event.sequence = atomic_inc_return(&task->ipp->sequence);

	drm_send_event(task->dev, &task->event->base);
}

static int exynos_drm_ipp_task_cleanup(struct exynos_drm_ipp_task *task)
{
	int ret = task->ret;

	if (ret == 0 && task->event) {
		exynos_drm_ipp_event_send(task);
		/* ensure event won't be canceled on task free */
		task->event = NULL;
	}

	exynos_drm_ipp_task_free(task->ipp, task);
	return ret;
}

static void exynos_drm_ipp_cleanup_work(struct work_struct *work)
{
	struct exynos_drm_ipp_task *task = container_of(work,
				      struct exynos_drm_ipp_task, cleanup_work);

	exynos_drm_ipp_task_cleanup(task);
}

static void exynos_drm_ipp_next_task(struct exynos_drm_ipp *ipp);

/**
 * exynos_drm_ipp_task_done - finish given task and set return code
 * @task: ipp task to finish
 * @ret: error code or 0 if operation has been performed successfully
 */
void exynos_drm_ipp_task_done(struct exynos_drm_ipp_task *task, int ret)
{
	struct exynos_drm_ipp *ipp = task->ipp;
	unsigned long flags;

	DRM_DEBUG_DRIVER("ipp: %d, task %pK done: %d\n", ipp->id, task, ret);

	spin_lock_irqsave(&ipp->lock, flags);
	if (ipp->task == task)
		ipp->task = NULL;
	task->flags |= DRM_EXYNOS_IPP_TASK_DONE;
	task->ret = ret;
	spin_unlock_irqrestore(&ipp->lock, flags);

	exynos_drm_ipp_next_task(ipp);
	wake_up(&ipp->done_wq);

	if (task->flags & DRM_EXYNOS_IPP_TASK_ASYNC) {
		INIT_WORK(&task->cleanup_work, exynos_drm_ipp_cleanup_work);
		schedule_work(&task->cleanup_work);
	}
}

static void exynos_drm_ipp_next_task(struct exynos_drm_ipp *ipp)
{
	struct exynos_drm_ipp_task *task;
	unsigned long flags;
	int ret;

	DRM_DEBUG_DRIVER("ipp: %d, try to run new task\n", ipp->id);

	spin_lock_irqsave(&ipp->lock, flags);

	if (ipp->task || list_empty(&ipp->todo_list)) {
		spin_unlock_irqrestore(&ipp->lock, flags);
		return;
	}

	task = list_first_entry(&ipp->todo_list, struct exynos_drm_ipp_task,
				head);
	list_del_init(&task->head);
	ipp->task = task;

	spin_unlock_irqrestore(&ipp->lock, flags);

	DRM_DEBUG_DRIVER("ipp: %d, selected task %pK to run\n", ipp->id, task);

	ret = ipp->funcs->commit(ipp, task);
	if (ret)
		exynos_drm_ipp_task_done(task, ret);
}

static void exynos_drm_ipp_schedule_task(struct exynos_drm_ipp *ipp,
					 struct exynos_drm_ipp_task *task)
{
	unsigned long flags;

	spin_lock_irqsave(&ipp->lock, flags);
	list_add(&task->head, &ipp->todo_list);
	spin_unlock_irqrestore(&ipp->lock, flags);

	exynos_drm_ipp_next_task(ipp);
}

static void exynos_drm_ipp_task_abort(struct exynos_drm_ipp *ipp,
				      struct exynos_drm_ipp_task *task)
{
	unsigned long flags;

	spin_lock_irqsave(&ipp->lock, flags);
	if (task->flags & DRM_EXYNOS_IPP_TASK_DONE) {
		/* already completed task */
		exynos_drm_ipp_task_cleanup(task);
	} else if (ipp->task != task) {
		/* task has not been scheduled for execution yet */
		list_del_init(&task->head);
		exynos_drm_ipp_task_cleanup(task);
	} else {
		/*
		 * currently processed task, call abort() and perform
		 * cleanup with async worker
		 */
		task->flags |= DRM_EXYNOS_IPP_TASK_ASYNC;
		spin_unlock_irqrestore(&ipp->lock, flags);
		if (ipp->funcs->abort)
			ipp->funcs->abort(ipp, task);
		return;
	}
	spin_unlock_irqrestore(&ipp->lock, flags);
}

/**
 * exynos_drm_ipp_commit_ioctl - perform image processing operation
 * @dev: DRM device
 * @data: ioctl data
 * @file_priv: DRM file info
 *
 * Construct a ipp task from the set of properties provided from the user
 * and try to schedule it to framebuffer processor hardware.
 *
 * Called by the user via ioctl.
 *
 * Returns:
 * Zero on success, negative errno on failure.
 */
int exynos_drm_ipp_commit_ioctl(struct drm_device *dev, void *data,
				struct drm_file *file_priv)
{
	struct drm_exynos_ioctl_ipp_commit *arg = data;
	struct exynos_drm_ipp *ipp;
	struct exynos_drm_ipp_task *task;
	int ret = 0;

	if ((arg->flags & ~DRM_EXYNOS_IPP_FLAGS) || arg->reserved)
		return -EINVAL;

	/* can't test and expect an event at the same time */
	if ((arg->flags & DRM_EXYNOS_IPP_FLAG_TEST_ONLY) &&
			(arg->flags & DRM_EXYNOS_IPP_FLAG_EVENT))
		return -EINVAL;

	ipp = __ipp_get(arg->ipp_id);
	if (!ipp)
		return -ENOENT;

	task = exynos_drm_ipp_task_alloc(ipp);
	if (!task)
		return -ENOMEM;

	ret = exynos_drm_ipp_task_set(task, arg);
	if (ret)
		goto free;

	ret = exynos_drm_ipp_task_check(task);
	if (ret)
		goto free;

	ret = exynos_drm_ipp_task_setup_buffers(task, file_priv);
	if (ret || arg->flags & DRM_EXYNOS_IPP_FLAG_TEST_ONLY)
		goto free;

	if (arg->flags & DRM_EXYNOS_IPP_FLAG_EVENT) {
		ret = exynos_drm_ipp_event_create(task, file_priv,
						 arg->user_data);
		if (ret)
			goto free;
	}

	/*
	 * Queue task for processing on the hardware. task object will be
	 * then freed after exynos_drm_ipp_task_done()
	 */
	if (arg->flags & DRM_EXYNOS_IPP_FLAG_NONBLOCK) {
		DRM_DEBUG_DRIVER("ipp: %d, nonblocking processing task %pK\n",
				 ipp->id, task);

		task->flags |= DRM_EXYNOS_IPP_TASK_ASYNC;
		exynos_drm_ipp_schedule_task(task->ipp, task);
		ret = 0;
	} else {
		DRM_DEBUG_DRIVER("ipp: %d, processing task %pK\n", ipp->id,
				 task);
		exynos_drm_ipp_schedule_task(ipp, task);
		ret = wait_event_interruptible(ipp->done_wq,
					task->flags & DRM_EXYNOS_IPP_TASK_DONE);
		if (ret)
			exynos_drm_ipp_task_abort(ipp, task);
		else
			ret = exynos_drm_ipp_task_cleanup(task);
	}
	return ret;
free:
	exynos_drm_ipp_task_free(ipp, task);

	return ret;
}