summaryrefslogtreecommitdiff
path: root/drivers/gpu/drm/vmwgfx/vmwgfx_surface.c
blob: 582814339748c2fa194921ab8034d7e629088367 (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
/**************************************************************************
 *
 * Copyright © 2009-2012 VMware, Inc., Palo Alto, CA., USA
 * All Rights Reserved.
 *
 * 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, sub license, 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 NON-INFRINGEMENT. IN NO EVENT SHALL
 * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS 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.
 *
 **************************************************************************/

#include "vmwgfx_drv.h"
#include "vmwgfx_resource_priv.h"
#include <ttm/ttm_placement.h>
#include "svga3d_surfacedefs.h"

/**
 * struct vmw_user_surface - User-space visible surface resource
 *
 * @base:           The TTM base object handling user-space visibility.
 * @srf:            The surface metadata.
 * @size:           TTM accounting size for the surface.
 */
struct vmw_user_surface {
	struct ttm_base_object base;
	struct vmw_surface srf;
	uint32_t size;
	uint32_t backup_handle;
};

/**
 * struct vmw_surface_offset - Backing store mip level offset info
 *
 * @face:           Surface face.
 * @mip:            Mip level.
 * @bo_offset:      Offset into backing store of this mip level.
 *
 */
struct vmw_surface_offset {
	uint32_t face;
	uint32_t mip;
	uint32_t bo_offset;
};

static void vmw_user_surface_free(struct vmw_resource *res);
static struct vmw_resource *
vmw_user_surface_base_to_res(struct ttm_base_object *base);
static int vmw_legacy_srf_bind(struct vmw_resource *res,
			       struct ttm_validate_buffer *val_buf);
static int vmw_legacy_srf_unbind(struct vmw_resource *res,
				 bool readback,
				 struct ttm_validate_buffer *val_buf);
static int vmw_legacy_srf_create(struct vmw_resource *res);
static int vmw_legacy_srf_destroy(struct vmw_resource *res);

static const struct vmw_user_resource_conv user_surface_conv = {
	.object_type = VMW_RES_SURFACE,
	.base_obj_to_res = vmw_user_surface_base_to_res,
	.res_free = vmw_user_surface_free
};

const struct vmw_user_resource_conv *user_surface_converter =
	&user_surface_conv;


static uint64_t vmw_user_surface_size;

static const struct vmw_res_func vmw_legacy_surface_func = {
	.res_type = vmw_res_surface,
	.needs_backup = false,
	.may_evict = true,
	.type_name = "legacy surfaces",
	.backup_placement = &vmw_srf_placement,
	.create = &vmw_legacy_srf_create,
	.destroy = &vmw_legacy_srf_destroy,
	.bind = &vmw_legacy_srf_bind,
	.unbind = &vmw_legacy_srf_unbind
};

/**
 * struct vmw_surface_dma - SVGA3D DMA command
 */
struct vmw_surface_dma {
	SVGA3dCmdHeader header;
	SVGA3dCmdSurfaceDMA body;
	SVGA3dCopyBox cb;
	SVGA3dCmdSurfaceDMASuffix suffix;
};

/**
 * struct vmw_surface_define - SVGA3D Surface Define command
 */
struct vmw_surface_define {
	SVGA3dCmdHeader header;
	SVGA3dCmdDefineSurface body;
};

/**
 * struct vmw_surface_destroy - SVGA3D Surface Destroy command
 */
struct vmw_surface_destroy {
	SVGA3dCmdHeader header;
	SVGA3dCmdDestroySurface body;
};


/**
 * vmw_surface_dma_size - Compute fifo size for a dma command.
 *
 * @srf: Pointer to a struct vmw_surface
 *
 * Computes the required size for a surface dma command for backup or
 * restoration of the surface represented by @srf.
 */
static inline uint32_t vmw_surface_dma_size(const struct vmw_surface *srf)
{
	return srf->num_sizes * sizeof(struct vmw_surface_dma);
}


/**
 * vmw_surface_define_size - Compute fifo size for a surface define command.
 *
 * @srf: Pointer to a struct vmw_surface
 *
 * Computes the required size for a surface define command for the definition
 * of the surface represented by @srf.
 */
static inline uint32_t vmw_surface_define_size(const struct vmw_surface *srf)
{
	return sizeof(struct vmw_surface_define) + srf->num_sizes *
		sizeof(SVGA3dSize);
}


/**
 * vmw_surface_destroy_size - Compute fifo size for a surface destroy command.
 *
 * Computes the required size for a surface destroy command for the destruction
 * of a hw surface.
 */
static inline uint32_t vmw_surface_destroy_size(void)
{
	return sizeof(struct vmw_surface_destroy);
}

/**
 * vmw_surface_destroy_encode - Encode a surface_destroy command.
 *
 * @id: The surface id
 * @cmd_space: Pointer to memory area in which the commands should be encoded.
 */
static void vmw_surface_destroy_encode(uint32_t id,
				       void *cmd_space)
{
	struct vmw_surface_destroy *cmd = (struct vmw_surface_destroy *)
		cmd_space;

	cmd->header.id = SVGA_3D_CMD_SURFACE_DESTROY;
	cmd->header.size = sizeof(cmd->body);
	cmd->body.sid = id;
}

/**
 * vmw_surface_define_encode - Encode a surface_define command.
 *
 * @srf: Pointer to a struct vmw_surface object.
 * @cmd_space: Pointer to memory area in which the commands should be encoded.
 */
static void vmw_surface_define_encode(const struct vmw_surface *srf,
				      void *cmd_space)
{
	struct vmw_surface_define *cmd = (struct vmw_surface_define *)
		cmd_space;
	struct drm_vmw_size *src_size;
	SVGA3dSize *cmd_size;
	uint32_t cmd_len;
	int i;

	cmd_len = sizeof(cmd->body) + srf->num_sizes * sizeof(SVGA3dSize);

	cmd->header.id = SVGA_3D_CMD_SURFACE_DEFINE;
	cmd->header.size = cmd_len;
	cmd->body.sid = srf->res.id;
	cmd->body.surfaceFlags = srf->flags;
	cmd->body.format = cpu_to_le32(srf->format);
	for (i = 0; i < DRM_VMW_MAX_SURFACE_FACES; ++i)
		cmd->body.face[i].numMipLevels = srf->mip_levels[i];

	cmd += 1;
	cmd_size = (SVGA3dSize *) cmd;
	src_size = srf->sizes;

	for (i = 0; i < srf->num_sizes; ++i, cmd_size++, src_size++) {
		cmd_size->width = src_size->width;
		cmd_size->height = src_size->height;
		cmd_size->depth = src_size->depth;
	}
}

/**
 * vmw_surface_dma_encode - Encode a surface_dma command.
 *
 * @srf: Pointer to a struct vmw_surface object.
 * @cmd_space: Pointer to memory area in which the commands should be encoded.
 * @ptr: Pointer to an SVGAGuestPtr indicating where the surface contents
 * should be placed or read from.
 * @to_surface: Boolean whether to DMA to the surface or from the surface.
 */
static void vmw_surface_dma_encode(struct vmw_surface *srf,
				   void *cmd_space,
				   const SVGAGuestPtr *ptr,
				   bool to_surface)
{
	uint32_t i;
	struct vmw_surface_dma *cmd = (struct vmw_surface_dma *)cmd_space;
	const struct svga3d_surface_desc *desc =
		svga3dsurface_get_desc(srf->format);

	for (i = 0; i < srf->num_sizes; ++i) {
		SVGA3dCmdHeader *header = &cmd->header;
		SVGA3dCmdSurfaceDMA *body = &cmd->body;
		SVGA3dCopyBox *cb = &cmd->cb;
		SVGA3dCmdSurfaceDMASuffix *suffix = &cmd->suffix;
		const struct vmw_surface_offset *cur_offset = &srf->offsets[i];
		const struct drm_vmw_size *cur_size = &srf->sizes[i];

		header->id = SVGA_3D_CMD_SURFACE_DMA;
		header->size = sizeof(*body) + sizeof(*cb) + sizeof(*suffix);

		body->guest.ptr = *ptr;
		body->guest.ptr.offset += cur_offset->bo_offset;
		body->guest.pitch = svga3dsurface_calculate_pitch(desc,
								  cur_size);
		body->host.sid = srf->res.id;
		body->host.face = cur_offset->face;
		body->host.mipmap = cur_offset->mip;
		body->transfer = ((to_surface) ?  SVGA3D_WRITE_HOST_VRAM :
				  SVGA3D_READ_HOST_VRAM);
		cb->x = 0;
		cb->y = 0;
		cb->z = 0;
		cb->srcx = 0;
		cb->srcy = 0;
		cb->srcz = 0;
		cb->w = cur_size->width;
		cb->h = cur_size->height;
		cb->d = cur_size->depth;

		suffix->suffixSize = sizeof(*suffix);
		suffix->maximumOffset =
			svga3dsurface_get_image_buffer_size(desc, cur_size,
							    body->guest.pitch);
		suffix->flags.discard = 0;
		suffix->flags.unsynchronized = 0;
		suffix->flags.reserved = 0;
		++cmd;
	}
};


/**
 * vmw_hw_surface_destroy - destroy a Device surface
 *
 * @res:        Pointer to a struct vmw_resource embedded in a struct
 *              vmw_surface.
 *
 * Destroys a the device surface associated with a struct vmw_surface if
 * any, and adjusts accounting and resource count accordingly.
 */
static void vmw_hw_surface_destroy(struct vmw_resource *res)
{

	struct vmw_private *dev_priv = res->dev_priv;
	struct vmw_surface *srf;
	void *cmd;

	if (res->id != -1) {

		cmd = vmw_fifo_reserve(dev_priv, vmw_surface_destroy_size());
		if (unlikely(cmd == NULL)) {
			DRM_ERROR("Failed reserving FIFO space for surface "
				  "destruction.\n");
			return;
		}

		vmw_surface_destroy_encode(res->id, cmd);
		vmw_fifo_commit(dev_priv, vmw_surface_destroy_size());

		/*
		 * used_memory_size_atomic, or separate lock
		 * to avoid taking dev_priv::cmdbuf_mutex in
		 * the destroy path.
		 */

		mutex_lock(&dev_priv->cmdbuf_mutex);
		srf = vmw_res_to_srf(res);
		dev_priv->used_memory_size -= res->backup_size;
		mutex_unlock(&dev_priv->cmdbuf_mutex);
	}
	vmw_3d_resource_dec(dev_priv, false);
}

/**
 * vmw_legacy_srf_create - Create a device surface as part of the
 * resource validation process.
 *
 * @res: Pointer to a struct vmw_surface.
 *
 * If the surface doesn't have a hw id.
 *
 * Returns -EBUSY if there wasn't sufficient device resources to
 * complete the validation. Retry after freeing up resources.
 *
 * May return other errors if the kernel is out of guest resources.
 */
static int vmw_legacy_srf_create(struct vmw_resource *res)
{
	struct vmw_private *dev_priv = res->dev_priv;
	struct vmw_surface *srf;
	uint32_t submit_size;
	uint8_t *cmd;
	int ret;

	if (likely(res->id != -1))
		return 0;

	srf = vmw_res_to_srf(res);
	if (unlikely(dev_priv->used_memory_size + res->backup_size >=
		     dev_priv->memory_size))
		return -EBUSY;

	/*
	 * Alloc id for the resource.
	 */

	ret = vmw_resource_alloc_id(res);
	if (unlikely(ret != 0)) {
		DRM_ERROR("Failed to allocate a surface id.\n");
		goto out_no_id;
	}

	if (unlikely(res->id >= SVGA3D_MAX_SURFACE_IDS)) {
		ret = -EBUSY;
		goto out_no_fifo;
	}

	/*
	 * Encode surface define- commands.
	 */

	submit_size = vmw_surface_define_size(srf);
	cmd = vmw_fifo_reserve(dev_priv, submit_size);
	if (unlikely(cmd == NULL)) {
		DRM_ERROR("Failed reserving FIFO space for surface "
			  "creation.\n");
		ret = -ENOMEM;
		goto out_no_fifo;
	}

	vmw_surface_define_encode(srf, cmd);
	vmw_fifo_commit(dev_priv, submit_size);
	/*
	 * Surface memory usage accounting.
	 */

	dev_priv->used_memory_size += res->backup_size;
	return 0;

out_no_fifo:
	vmw_resource_release_id(res);
out_no_id:
	return ret;
}

/**
 * vmw_legacy_srf_dma - Copy backup data to or from a legacy surface.
 *
 * @res:            Pointer to a struct vmw_res embedded in a struct
 *                  vmw_surface.
 * @val_buf:        Pointer to a struct ttm_validate_buffer containing
 *                  information about the backup buffer.
 * @bind:           Boolean wether to DMA to the surface.
 *
 * Transfer backup data to or from a legacy surface as part of the
 * validation process.
 * May return other errors if the kernel is out of guest resources.
 * The backup buffer will be fenced or idle upon successful completion,
 * and if the surface needs persistent backup storage, the backup buffer
 * will also be returned reserved iff @bind is true.
 */
static int vmw_legacy_srf_dma(struct vmw_resource *res,
			      struct ttm_validate_buffer *val_buf,
			      bool bind)
{
	SVGAGuestPtr ptr;
	struct vmw_fence_obj *fence;
	uint32_t submit_size;
	struct vmw_surface *srf = vmw_res_to_srf(res);
	uint8_t *cmd;
	struct vmw_private *dev_priv = res->dev_priv;

	BUG_ON(val_buf->bo == NULL);

	submit_size = vmw_surface_dma_size(srf);
	cmd = vmw_fifo_reserve(dev_priv, submit_size);
	if (unlikely(cmd == NULL)) {
		DRM_ERROR("Failed reserving FIFO space for surface "
			  "DMA.\n");
		return -ENOMEM;
	}
	vmw_bo_get_guest_ptr(val_buf->bo, &ptr);
	vmw_surface_dma_encode(srf, cmd, &ptr, bind);

	vmw_fifo_commit(dev_priv, submit_size);

	/*
	 * Create a fence object and fence the backup buffer.
	 */

	(void) vmw_execbuf_fence_commands(NULL, dev_priv,
					  &fence, NULL);

	vmw_fence_single_bo(val_buf->bo, fence);

	if (likely(fence != NULL))
		vmw_fence_obj_unreference(&fence);

	return 0;
}

/**
 * vmw_legacy_srf_bind - Perform a legacy surface bind as part of the
 *                       surface validation process.
 *
 * @res:            Pointer to a struct vmw_res embedded in a struct
 *                  vmw_surface.
 * @val_buf:        Pointer to a struct ttm_validate_buffer containing
 *                  information about the backup buffer.
 *
 * This function will copy backup data to the surface if the
 * backup buffer is dirty.
 */
static int vmw_legacy_srf_bind(struct vmw_resource *res,
			       struct ttm_validate_buffer *val_buf)
{
	if (!res->backup_dirty)
		return 0;

	return vmw_legacy_srf_dma(res, val_buf, true);
}


/**
 * vmw_legacy_srf_unbind - Perform a legacy surface unbind as part of the
 *                         surface eviction process.
 *
 * @res:            Pointer to a struct vmw_res embedded in a struct
 *                  vmw_surface.
 * @val_buf:        Pointer to a struct ttm_validate_buffer containing
 *                  information about the backup buffer.
 *
 * This function will copy backup data from the surface.
 */
static int vmw_legacy_srf_unbind(struct vmw_resource *res,
				 bool readback,
				 struct ttm_validate_buffer *val_buf)
{
	if (unlikely(readback))
		return vmw_legacy_srf_dma(res, val_buf, false);
	return 0;
}

/**
 * vmw_legacy_srf_destroy - Destroy a device surface as part of a
 *                          resource eviction process.
 *
 * @res:            Pointer to a struct vmw_res embedded in a struct
 *                  vmw_surface.
 */
static int vmw_legacy_srf_destroy(struct vmw_resource *res)
{
	struct vmw_private *dev_priv = res->dev_priv;
	uint32_t submit_size;
	uint8_t *cmd;

	BUG_ON(res->id == -1);

	/*
	 * Encode the dma- and surface destroy commands.
	 */

	submit_size = vmw_surface_destroy_size();
	cmd = vmw_fifo_reserve(dev_priv, submit_size);
	if (unlikely(cmd == NULL)) {
		DRM_ERROR("Failed reserving FIFO space for surface "
			  "eviction.\n");
		return -ENOMEM;
	}

	vmw_surface_destroy_encode(res->id, cmd);
	vmw_fifo_commit(dev_priv, submit_size);

	/*
	 * Surface memory usage accounting.
	 */

	dev_priv->used_memory_size -= res->backup_size;

	/*
	 * Release the surface ID.
	 */

	vmw_resource_release_id(res);

	return 0;
}


/**
 * vmw_surface_init - initialize a struct vmw_surface
 *
 * @dev_priv:       Pointer to a device private struct.
 * @srf:            Pointer to the struct vmw_surface to initialize.
 * @res_free:       Pointer to a resource destructor used to free
 *                  the object.
 */
static int vmw_surface_init(struct vmw_private *dev_priv,
			    struct vmw_surface *srf,
			    void (*res_free) (struct vmw_resource *res))
{
	int ret;
	struct vmw_resource *res = &srf->res;

	BUG_ON(res_free == NULL);
	(void) vmw_3d_resource_inc(dev_priv, false);
	ret = vmw_resource_init(dev_priv, res, true, res_free,
				&vmw_legacy_surface_func);

	if (unlikely(ret != 0)) {
		vmw_3d_resource_dec(dev_priv, false);
		res_free(res);
		return ret;
	}

	/*
	 * The surface won't be visible to hardware until a
	 * surface validate.
	 */

	vmw_resource_activate(res, vmw_hw_surface_destroy);
	return ret;
}

/**
 * vmw_user_surface_base_to_res - TTM base object to resource converter for
 *                                user visible surfaces
 *
 * @base:           Pointer to a TTM base object
 *
 * Returns the struct vmw_resource embedded in a struct vmw_surface
 * for the user-visible object identified by the TTM base object @base.
 */
static struct vmw_resource *
vmw_user_surface_base_to_res(struct ttm_base_object *base)
{
	return &(container_of(base, struct vmw_user_surface, base)->srf.res);
}

/**
 * vmw_user_surface_free - User visible surface resource destructor
 *
 * @res:            A struct vmw_resource embedded in a struct vmw_surface.
 */
static void vmw_user_surface_free(struct vmw_resource *res)
{
	struct vmw_surface *srf = vmw_res_to_srf(res);
	struct vmw_user_surface *user_srf =
	    container_of(srf, struct vmw_user_surface, srf);
	struct vmw_private *dev_priv = srf->res.dev_priv;
	uint32_t size = user_srf->size;

	kfree(srf->offsets);
	kfree(srf->sizes);
	kfree(srf->snooper.image);
	ttm_base_object_kfree(user_srf, base);
	ttm_mem_global_free(vmw_mem_glob(dev_priv), size);
}

/**
 * vmw_user_surface_free - User visible surface TTM base object destructor
 *
 * @p_base:         Pointer to a pointer to a TTM base object
 *                  embedded in a struct vmw_user_surface.
 *
 * Drops the base object's reference on its resource, and the
 * pointer pointed to by *p_base is set to NULL.
 */
static void vmw_user_surface_base_release(struct ttm_base_object **p_base)
{
	struct ttm_base_object *base = *p_base;
	struct vmw_user_surface *user_srf =
	    container_of(base, struct vmw_user_surface, base);
	struct vmw_resource *res = &user_srf->srf.res;

	*p_base = NULL;
	vmw_resource_unreference(&res);
}

/**
 * vmw_user_surface_destroy_ioctl - Ioctl function implementing
 *                                  the user surface destroy functionality.
 *
 * @dev:            Pointer to a struct drm_device.
 * @data:           Pointer to data copied from / to user-space.
 * @file_priv:      Pointer to a drm file private structure.
 */
int vmw_surface_destroy_ioctl(struct drm_device *dev, void *data,
			      struct drm_file *file_priv)
{
	struct drm_vmw_surface_arg *arg = (struct drm_vmw_surface_arg *)data;
	struct ttm_object_file *tfile = vmw_fpriv(file_priv)->tfile;

	return ttm_ref_object_base_unref(tfile, arg->sid, TTM_REF_USAGE);
}

/**
 * vmw_user_surface_define_ioctl - Ioctl function implementing
 *                                  the user surface define functionality.
 *
 * @dev:            Pointer to a struct drm_device.
 * @data:           Pointer to data copied from / to user-space.
 * @file_priv:      Pointer to a drm file private structure.
 */
int vmw_surface_define_ioctl(struct drm_device *dev, void *data,
			     struct drm_file *file_priv)
{
	struct vmw_private *dev_priv = vmw_priv(dev);
	struct vmw_user_surface *user_srf;
	struct vmw_surface *srf;
	struct vmw_resource *res;
	struct vmw_resource *tmp;
	union drm_vmw_surface_create_arg *arg =
	    (union drm_vmw_surface_create_arg *)data;
	struct drm_vmw_surface_create_req *req = &arg->req;
	struct drm_vmw_surface_arg *rep = &arg->rep;
	struct ttm_object_file *tfile = vmw_fpriv(file_priv)->tfile;
	struct drm_vmw_size __user *user_sizes;
	int ret;
	int i, j;
	uint32_t cur_bo_offset;
	struct drm_vmw_size *cur_size;
	struct vmw_surface_offset *cur_offset;
	uint32_t num_sizes;
	uint32_t size;
	struct vmw_master *vmaster = vmw_master(file_priv->master);
	const struct svga3d_surface_desc *desc;

	if (unlikely(vmw_user_surface_size == 0))
		vmw_user_surface_size = ttm_round_pot(sizeof(*user_srf)) +
			128;

	num_sizes = 0;
	for (i = 0; i < DRM_VMW_MAX_SURFACE_FACES; ++i)
		num_sizes += req->mip_levels[i];

	if (num_sizes > DRM_VMW_MAX_SURFACE_FACES *
	    DRM_VMW_MAX_MIP_LEVELS)
		return -EINVAL;

	size = vmw_user_surface_size + 128 +
		ttm_round_pot(num_sizes * sizeof(struct drm_vmw_size)) +
		ttm_round_pot(num_sizes * sizeof(struct vmw_surface_offset));


	desc = svga3dsurface_get_desc(req->format);
	if (unlikely(desc->block_desc == SVGA3DBLOCKDESC_NONE)) {
		DRM_ERROR("Invalid surface format for surface creation.\n");
		return -EINVAL;
	}

	ret = ttm_read_lock(&vmaster->lock, true);
	if (unlikely(ret != 0))
		return ret;

	ret = ttm_mem_global_alloc(vmw_mem_glob(dev_priv),
				   size, false, true);
	if (unlikely(ret != 0)) {
		if (ret != -ERESTARTSYS)
			DRM_ERROR("Out of graphics memory for surface"
				  " creation.\n");
		goto out_unlock;
	}

	user_srf = kzalloc(sizeof(*user_srf), GFP_KERNEL);
	if (unlikely(user_srf == NULL)) {
		ret = -ENOMEM;
		goto out_no_user_srf;
	}

	srf = &user_srf->srf;
	res = &srf->res;

	srf->flags = req->flags;
	srf->format = req->format;
	srf->scanout = req->scanout;

	memcpy(srf->mip_levels, req->mip_levels, sizeof(srf->mip_levels));
	srf->num_sizes = num_sizes;
	user_srf->size = size;

	srf->sizes = kmalloc(srf->num_sizes * sizeof(*srf->sizes), GFP_KERNEL);
	if (unlikely(srf->sizes == NULL)) {
		ret = -ENOMEM;
		goto out_no_sizes;
	}
	srf->offsets = kmalloc(srf->num_sizes * sizeof(*srf->offsets),
			       GFP_KERNEL);
	if (unlikely(srf->sizes == NULL)) {
		ret = -ENOMEM;
		goto out_no_offsets;
	}

	user_sizes = (struct drm_vmw_size __user *)(unsigned long)
	    req->size_addr;

	ret = copy_from_user(srf->sizes, user_sizes,
			     srf->num_sizes * sizeof(*srf->sizes));
	if (unlikely(ret != 0)) {
		ret = -EFAULT;
		goto out_no_copy;
	}

	srf->base_size = *srf->sizes;
	srf->autogen_filter = SVGA3D_TEX_FILTER_NONE;
	srf->multisample_count = 1;

	cur_bo_offset = 0;
	cur_offset = srf->offsets;
	cur_size = srf->sizes;

	for (i = 0; i < DRM_VMW_MAX_SURFACE_FACES; ++i) {
		for (j = 0; j < srf->mip_levels[i]; ++j) {
			uint32_t stride = svga3dsurface_calculate_pitch
				(desc, cur_size);

			cur_offset->face = i;
			cur_offset->mip = j;
			cur_offset->bo_offset = cur_bo_offset;
			cur_bo_offset += svga3dsurface_get_image_buffer_size
				(desc, cur_size, stride);
			++cur_offset;
			++cur_size;
		}
	}
	res->backup_size = cur_bo_offset;
	if (srf->scanout &&
	    srf->num_sizes == 1 &&
	    srf->sizes[0].width == 64 &&
	    srf->sizes[0].height == 64 &&
	    srf->format == SVGA3D_A8R8G8B8) {

		srf->snooper.image = kmalloc(64 * 64 * 4, GFP_KERNEL);
		/* clear the image */
		if (srf->snooper.image) {
			memset(srf->snooper.image, 0x00, 64 * 64 * 4);
		} else {
			DRM_ERROR("Failed to allocate cursor_image\n");
			ret = -ENOMEM;
			goto out_no_copy;
		}
	} else {
		srf->snooper.image = NULL;
	}
	srf->snooper.crtc = NULL;

	user_srf->base.shareable = false;
	user_srf->base.tfile = NULL;

	/**
	 * From this point, the generic resource management functions
	 * destroy the object on failure.
	 */

	ret = vmw_surface_init(dev_priv, srf, vmw_user_surface_free);
	if (unlikely(ret != 0))
		goto out_unlock;

	tmp = vmw_resource_reference(&srf->res);
	ret = ttm_base_object_init(tfile, &user_srf->base,
				   req->shareable, VMW_RES_SURFACE,
				   &vmw_user_surface_base_release, NULL);

	if (unlikely(ret != 0)) {
		vmw_resource_unreference(&tmp);
		vmw_resource_unreference(&res);
		goto out_unlock;
	}

	rep->sid = user_srf->base.hash.key;
	vmw_resource_unreference(&res);

	ttm_read_unlock(&vmaster->lock);
	return 0;
out_no_copy:
	kfree(srf->offsets);
out_no_offsets:
	kfree(srf->sizes);
out_no_sizes:
	ttm_base_object_kfree(user_srf, base);
out_no_user_srf:
	ttm_mem_global_free(vmw_mem_glob(dev_priv), size);
out_unlock:
	ttm_read_unlock(&vmaster->lock);
	return ret;
}

/**
 * vmw_user_surface_define_ioctl - Ioctl function implementing
 *                                  the user surface reference functionality.
 *
 * @dev:            Pointer to a struct drm_device.
 * @data:           Pointer to data copied from / to user-space.
 * @file_priv:      Pointer to a drm file private structure.
 */
int vmw_surface_reference_ioctl(struct drm_device *dev, void *data,
				struct drm_file *file_priv)
{
	union drm_vmw_surface_reference_arg *arg =
	    (union drm_vmw_surface_reference_arg *)data;
	struct drm_vmw_surface_arg *req = &arg->req;
	struct drm_vmw_surface_create_req *rep = &arg->rep;
	struct ttm_object_file *tfile = vmw_fpriv(file_priv)->tfile;
	struct vmw_surface *srf;
	struct vmw_user_surface *user_srf;
	struct drm_vmw_size __user *user_sizes;
	struct ttm_base_object *base;
	int ret = -EINVAL;

	base = ttm_base_object_lookup(tfile, req->sid);
	if (unlikely(base == NULL)) {
		DRM_ERROR("Could not find surface to reference.\n");
		return -EINVAL;
	}

	if (unlikely(base->object_type != VMW_RES_SURFACE))
		goto out_bad_resource;

	user_srf = container_of(base, struct vmw_user_surface, base);
	srf = &user_srf->srf;

	ret = ttm_ref_object_add(tfile, &user_srf->base, TTM_REF_USAGE, NULL);
	if (unlikely(ret != 0)) {
		DRM_ERROR("Could not add a reference to a surface.\n");
		goto out_no_reference;
	}

	rep->flags = srf->flags;
	rep->format = srf->format;
	memcpy(rep->mip_levels, srf->mip_levels, sizeof(srf->mip_levels));
	user_sizes = (struct drm_vmw_size __user *)(unsigned long)
	    rep->size_addr;

	if (user_sizes)
		ret = copy_to_user(user_sizes, srf->sizes,
				   srf->num_sizes * sizeof(*srf->sizes));
	if (unlikely(ret != 0)) {
		DRM_ERROR("copy_to_user failed %p %u\n",
			  user_sizes, srf->num_sizes);
		ret = -EFAULT;
	}
out_bad_resource:
out_no_reference:
	ttm_base_object_unref(&base);

	return ret;
}