summaryrefslogtreecommitdiffstats
path: root/drivers/gpu/drm/vmwgfx/vmwgfx_bo.c
blob: 7ce1c2f87d9a7ccbce4c84596d1206afa8bdef1e (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
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
// SPDX-License-Identifier: GPL-2.0 OR MIT
/**************************************************************************
 *
 * Copyright © 2011-2018 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 <drm/ttm/ttm_placement.h>

#include <drm/drmP.h>
#include "vmwgfx_drv.h"
#include "ttm_object.h"


/**
 * struct vmw_user_buffer_object - User-space-visible buffer object
 *
 * @prime: The prime object providing user visibility.
 * @vbo: The struct vmw_buffer_object
 */
struct vmw_user_buffer_object {
	struct ttm_prime_object prime;
	struct vmw_buffer_object vbo;
};


/**
 * vmw_buffer_object - Convert a struct ttm_buffer_object to a struct
 * vmw_buffer_object.
 *
 * @bo: Pointer to the TTM buffer object.
 * Return: Pointer to the struct vmw_buffer_object embedding the
 * TTM buffer object.
 */
static struct vmw_buffer_object *
vmw_buffer_object(struct ttm_buffer_object *bo)
{
	return container_of(bo, struct vmw_buffer_object, base);
}


/**
 * vmw_user_buffer_object - Convert a struct ttm_buffer_object to a struct
 * vmw_user_buffer_object.
 *
 * @bo: Pointer to the TTM buffer object.
 * Return: Pointer to the struct vmw_buffer_object embedding the TTM buffer
 * object.
 */
static struct vmw_user_buffer_object *
vmw_user_buffer_object(struct ttm_buffer_object *bo)
{
	struct vmw_buffer_object *vmw_bo = vmw_buffer_object(bo);

	return container_of(vmw_bo, struct vmw_user_buffer_object, vbo);
}


/**
 * vmw_bo_pin_in_placement - Validate a buffer to placement.
 *
 * @dev_priv:  Driver private.
 * @buf:  DMA buffer to move.
 * @placement:  The placement to pin it.
 * @interruptible:  Use interruptible wait.
 * Return: Zero on success, Negative error code on failure. In particular
 * -ERESTARTSYS if interrupted by a signal
 */
int vmw_bo_pin_in_placement(struct vmw_private *dev_priv,
			    struct vmw_buffer_object *buf,
			    struct ttm_placement *placement,
			    bool interruptible)
{
	struct ttm_operation_ctx ctx = {interruptible, false };
	struct ttm_buffer_object *bo = &buf->base;
	int ret;
	uint32_t new_flags;

	ret = ttm_write_lock(&dev_priv->reservation_sem, interruptible);
	if (unlikely(ret != 0))
		return ret;

	vmw_execbuf_release_pinned_bo(dev_priv);

	ret = ttm_bo_reserve(bo, interruptible, false, NULL);
	if (unlikely(ret != 0))
		goto err;

	if (buf->pin_count > 0)
		ret = ttm_bo_mem_compat(placement, &bo->mem,
					&new_flags) == true ? 0 : -EINVAL;
	else
		ret = ttm_bo_validate(bo, placement, &ctx);

	if (!ret)
		vmw_bo_pin_reserved(buf, true);

	ttm_bo_unreserve(bo);

err:
	ttm_write_unlock(&dev_priv->reservation_sem);
	return ret;
}


/**
 * vmw_bo_pin_in_vram_or_gmr - Move a buffer to vram or gmr.
 *
 * This function takes the reservation_sem in write mode.
 * Flushes and unpins the query bo to avoid failures.
 *
 * @dev_priv:  Driver private.
 * @buf:  DMA buffer to move.
 * @pin:  Pin buffer if true.
 * @interruptible:  Use interruptible wait.
 * Return: Zero on success, Negative error code on failure. In particular
 * -ERESTARTSYS if interrupted by a signal
 */
int vmw_bo_pin_in_vram_or_gmr(struct vmw_private *dev_priv,
			      struct vmw_buffer_object *buf,
			      bool interruptible)
{
	struct ttm_operation_ctx ctx = {interruptible, false };
	struct ttm_buffer_object *bo = &buf->base;
	int ret;
	uint32_t new_flags;

	ret = ttm_write_lock(&dev_priv->reservation_sem, interruptible);
	if (unlikely(ret != 0))
		return ret;

	vmw_execbuf_release_pinned_bo(dev_priv);

	ret = ttm_bo_reserve(bo, interruptible, false, NULL);
	if (unlikely(ret != 0))
		goto err;

	if (buf->pin_count > 0) {
		ret = ttm_bo_mem_compat(&vmw_vram_gmr_placement, &bo->mem,
					&new_flags) == true ? 0 : -EINVAL;
		goto out_unreserve;
	}

	ret = ttm_bo_validate(bo, &vmw_vram_gmr_placement, &ctx);
	if (likely(ret == 0) || ret == -ERESTARTSYS)
		goto out_unreserve;

	ret = ttm_bo_validate(bo, &vmw_vram_placement, &ctx);

out_unreserve:
	if (!ret)
		vmw_bo_pin_reserved(buf, true);

	ttm_bo_unreserve(bo);
err:
	ttm_write_unlock(&dev_priv->reservation_sem);
	return ret;
}


/**
 * vmw_bo_pin_in_vram - Move a buffer to vram.
 *
 * This function takes the reservation_sem in write mode.
 * Flushes and unpins the query bo to avoid failures.
 *
 * @dev_priv:  Driver private.
 * @buf:  DMA buffer to move.
 * @interruptible:  Use interruptible wait.
 * Return: Zero on success, Negative error code on failure. In particular
 * -ERESTARTSYS if interrupted by a signal
 */
int vmw_bo_pin_in_vram(struct vmw_private *dev_priv,
		       struct vmw_buffer_object *buf,
		       bool interruptible)
{
	return vmw_bo_pin_in_placement(dev_priv, buf, &vmw_vram_placement,
				       interruptible);
}


/**
 * vmw_bo_pin_in_start_of_vram - Move a buffer to start of vram.
 *
 * This function takes the reservation_sem in write mode.
 * Flushes and unpins the query bo to avoid failures.
 *
 * @dev_priv:  Driver private.
 * @buf:  DMA buffer to pin.
 * @interruptible:  Use interruptible wait.
 * Return: Zero on success, Negative error code on failure. In particular
 * -ERESTARTSYS if interrupted by a signal
 */
int vmw_bo_pin_in_start_of_vram(struct vmw_private *dev_priv,
				struct vmw_buffer_object *buf,
				bool interruptible)
{
	struct ttm_operation_ctx ctx = {interruptible, false };
	struct ttm_buffer_object *bo = &buf->base;
	struct ttm_placement placement;
	struct ttm_place place;
	int ret = 0;
	uint32_t new_flags;

	place = vmw_vram_placement.placement[0];
	place.lpfn = bo->num_pages;
	placement.num_placement = 1;
	placement.placement = &place;
	placement.num_busy_placement = 1;
	placement.busy_placement = &place;

	ret = ttm_write_lock(&dev_priv->reservation_sem, interruptible);
	if (unlikely(ret != 0))
		return ret;

	vmw_execbuf_release_pinned_bo(dev_priv);
	ret = ttm_bo_reserve(bo, interruptible, false, NULL);
	if (unlikely(ret != 0))
		goto err_unlock;

	/*
	 * Is this buffer already in vram but not at the start of it?
	 * In that case, evict it first because TTM isn't good at handling
	 * that situation.
	 */
	if (bo->mem.mem_type == TTM_PL_VRAM &&
	    bo->mem.start < bo->num_pages &&
	    bo->mem.start > 0 &&
	    buf->pin_count == 0) {
		ctx.interruptible = false;
		(void) ttm_bo_validate(bo, &vmw_sys_placement, &ctx);
	}

	if (buf->pin_count > 0)
		ret = ttm_bo_mem_compat(&placement, &bo->mem,
					&new_flags) == true ? 0 : -EINVAL;
	else
		ret = ttm_bo_validate(bo, &placement, &ctx);

	/* For some reason we didn't end up at the start of vram */
	WARN_ON(ret == 0 && bo->offset != 0);
	if (!ret)
		vmw_bo_pin_reserved(buf, true);

	ttm_bo_unreserve(bo);
err_unlock:
	ttm_write_unlock(&dev_priv->reservation_sem);

	return ret;
}


/**
 * vmw_bo_unpin - Unpin the buffer given buffer, does not move the buffer.
 *
 * This function takes the reservation_sem in write mode.
 *
 * @dev_priv:  Driver private.
 * @buf:  DMA buffer to unpin.
 * @interruptible:  Use interruptible wait.
 * Return: Zero on success, Negative error code on failure. In particular
 * -ERESTARTSYS if interrupted by a signal
 */
int vmw_bo_unpin(struct vmw_private *dev_priv,
		 struct vmw_buffer_object *buf,
		 bool interruptible)
{
	struct ttm_buffer_object *bo = &buf->base;
	int ret;

	ret = ttm_read_lock(&dev_priv->reservation_sem, interruptible);
	if (unlikely(ret != 0))
		return ret;

	ret = ttm_bo_reserve(bo, interruptible, false, NULL);
	if (unlikely(ret != 0))
		goto err;

	vmw_bo_pin_reserved(buf, false);

	ttm_bo_unreserve(bo);

err:
	ttm_read_unlock(&dev_priv->reservation_sem);
	return ret;
}

/**
 * vmw_bo_get_guest_ptr - Get the guest ptr representing the current placement
 * of a buffer.
 *
 * @bo: Pointer to a struct ttm_buffer_object. Must be pinned or reserved.
 * @ptr: SVGAGuestPtr returning the result.
 */
void vmw_bo_get_guest_ptr(const struct ttm_buffer_object *bo,
			  SVGAGuestPtr *ptr)
{
	if (bo->mem.mem_type == TTM_PL_VRAM) {
		ptr->gmrId = SVGA_GMR_FRAMEBUFFER;
		ptr->offset = bo->offset;
	} else {
		ptr->gmrId = bo->mem.start;
		ptr->offset = 0;
	}
}


/**
 * vmw_bo_pin_reserved - Pin or unpin a buffer object without moving it.
 *
 * @vbo: The buffer object. Must be reserved.
 * @pin: Whether to pin or unpin.
 *
 */
void vmw_bo_pin_reserved(struct vmw_buffer_object *vbo, bool pin)
{
	struct ttm_operation_ctx ctx = { false, true };
	struct ttm_place pl;
	struct ttm_placement placement;
	struct ttm_buffer_object *bo = &vbo->base;
	uint32_t old_mem_type = bo->mem.mem_type;
	int ret;

	lockdep_assert_held(&bo->resv->lock.base);

	if (pin) {
		if (vbo->pin_count++ > 0)
			return;
	} else {
		WARN_ON(vbo->pin_count <= 0);
		if (--vbo->pin_count > 0)
			return;
	}

	pl.fpfn = 0;
	pl.lpfn = 0;
	pl.flags = TTM_PL_FLAG_VRAM | VMW_PL_FLAG_GMR | VMW_PL_FLAG_MOB
		| TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED;
	if (pin)
		pl.flags |= TTM_PL_FLAG_NO_EVICT;

	memset(&placement, 0, sizeof(placement));
	placement.num_placement = 1;
	placement.placement = &pl;

	ret = ttm_bo_validate(bo, &placement, &ctx);

	BUG_ON(ret != 0 || bo->mem.mem_type != old_mem_type);
}


/**
 * vmw_bo_map_and_cache - Map a buffer object and cache the map
 *
 * @vbo: The buffer object to map
 * Return: A kernel virtual address or NULL if mapping failed.
 *
 * This function maps a buffer object into the kernel address space, or
 * returns the virtual kernel address of an already existing map. The virtual
 * address remains valid as long as the buffer object is pinned or reserved.
 * The cached map is torn down on either
 * 1) Buffer object move
 * 2) Buffer object swapout
 * 3) Buffer object destruction
 *
 */
void *vmw_bo_map_and_cache(struct vmw_buffer_object *vbo)
{
	struct ttm_buffer_object *bo = &vbo->base;
	bool not_used;
	void *virtual;
	int ret;

	virtual = ttm_kmap_obj_virtual(&vbo->map, &not_used);
	if (virtual)
		return virtual;

	ret = ttm_bo_kmap(bo, 0, bo->num_pages, &vbo->map);
	if (ret)
		DRM_ERROR("Buffer object map failed: %d.\n", ret);

	return ttm_kmap_obj_virtual(&vbo->map, &not_used);
}


/**
 * vmw_bo_unmap - Tear down a cached buffer object map.
 *
 * @vbo: The buffer object whose map we are tearing down.
 *
 * This function tears down a cached map set up using
 * vmw_buffer_object_map_and_cache().
 */
void vmw_bo_unmap(struct vmw_buffer_object *vbo)
{
	if (vbo->map.bo == NULL)
		return;

	ttm_bo_kunmap(&vbo->map);
}


/**
 * vmw_bo_acc_size - Calculate the pinned memory usage of buffers
 *
 * @dev_priv: Pointer to a struct vmw_private identifying the device.
 * @size: The requested buffer size.
 * @user: Whether this is an ordinary dma buffer or a user dma buffer.
 */
static size_t vmw_bo_acc_size(struct vmw_private *dev_priv, size_t size,
			      bool user)
{
	static size_t struct_size, user_struct_size;
	size_t num_pages = PAGE_ALIGN(size) >> PAGE_SHIFT;
	size_t page_array_size = ttm_round_pot(num_pages * sizeof(void *));

	if (unlikely(struct_size == 0)) {
		size_t backend_size = ttm_round_pot(vmw_tt_size);

		struct_size = backend_size +
			ttm_round_pot(sizeof(struct vmw_buffer_object));
		user_struct_size = backend_size +
		  ttm_round_pot(sizeof(struct vmw_user_buffer_object)) +
				      TTM_OBJ_EXTRA_SIZE;
	}

	if (dev_priv->map_mode == vmw_dma_alloc_coherent)
		page_array_size +=
			ttm_round_pot(num_pages * sizeof(dma_addr_t));

	return ((user) ? user_struct_size : struct_size) +
		page_array_size;
}


/**
 * vmw_bo_bo_free - vmw buffer object destructor
 *
 * @bo: Pointer to the embedded struct ttm_buffer_object
 */
void vmw_bo_bo_free(struct ttm_buffer_object *bo)
{
	struct vmw_buffer_object *vmw_bo = vmw_buffer_object(bo);

	vmw_bo_unmap(vmw_bo);
	kfree(vmw_bo);
}


/**
 * vmw_user_bo_destroy - vmw buffer object destructor
 *
 * @bo: Pointer to the embedded struct ttm_buffer_object
 */
static void vmw_user_bo_destroy(struct ttm_buffer_object *bo)
{
	struct vmw_user_buffer_object *vmw_user_bo = vmw_user_buffer_object(bo);

	vmw_bo_unmap(&vmw_user_bo->vbo);
	ttm_prime_object_kfree(vmw_user_bo, prime);
}


/**
 * vmw_bo_init - Initialize a vmw buffer object
 *
 * @dev_priv: Pointer to the device private struct
 * @vmw_bo: Pointer to the struct vmw_buffer_object to initialize.
 * @size: Buffer object size in bytes.
 * @placement: Initial placement.
 * @interruptible: Whether waits should be performed interruptible.
 * @bo_free: The buffer object destructor.
 * Returns: Zero on success, negative error code on error.
 *
 * Note that on error, the code will free the buffer object.
 */
int vmw_bo_init(struct vmw_private *dev_priv,
		struct vmw_buffer_object *vmw_bo,
		size_t size, struct ttm_placement *placement,
		bool interruptible,
		void (*bo_free)(struct ttm_buffer_object *bo))
{
	struct ttm_bo_device *bdev = &dev_priv->bdev;
	size_t acc_size;
	int ret;
	bool user = (bo_free == &vmw_user_bo_destroy);

	WARN_ON_ONCE(!bo_free && (!user && (bo_free != vmw_bo_bo_free)));

	acc_size = vmw_bo_acc_size(dev_priv, size, user);
	memset(vmw_bo, 0, sizeof(*vmw_bo));

	INIT_LIST_HEAD(&vmw_bo->res_list);

	ret = ttm_bo_init(bdev, &vmw_bo->base, size,
			  ttm_bo_type_device, placement,
			  0, interruptible, acc_size,
			  NULL, NULL, bo_free);
	return ret;
}


/**
 * vmw_user_bo_release - TTM reference base object release callback for
 * vmw user buffer objects
 *
 * @p_base: The TTM base object pointer about to be unreferenced.
 *
 * Clears the TTM base object pointer and drops the reference the
 * base object has on the underlying struct vmw_buffer_object.
 */
static void vmw_user_bo_release(struct ttm_base_object **p_base)
{
	struct vmw_user_buffer_object *vmw_user_bo;
	struct ttm_base_object *base = *p_base;
	struct ttm_buffer_object *bo;

	*p_base = NULL;

	if (unlikely(base == NULL))
		return;

	vmw_user_bo = container_of(base, struct vmw_user_buffer_object,
				   prime.base);
	bo = &vmw_user_bo->vbo.base;
	ttm_bo_unref(&bo);
}


/**
 * vmw_user_bo_ref_obj-release - TTM synccpu reference object release callback
 * for vmw user buffer objects
 *
 * @base: Pointer to the TTM base object
 * @ref_type: Reference type of the reference reaching zero.
 *
 * Called when user-space drops its last synccpu reference on the buffer
 * object, Either explicitly or as part of a cleanup file close.
 */
static void vmw_user_bo_ref_obj_release(struct ttm_base_object *base,
					enum ttm_ref_type ref_type)
{
	struct vmw_user_buffer_object *user_bo;

	user_bo = container_of(base, struct vmw_user_buffer_object, prime.base);

	switch (ref_type) {
	case TTM_REF_SYNCCPU_WRITE:
		ttm_bo_synccpu_write_release(&user_bo->vbo.base);
		break;
	default:
		WARN_ONCE(true, "Undefined buffer object reference release.\n");
	}
}


/**
 * vmw_user_bo_alloc - Allocate a user buffer object
 *
 * @dev_priv: Pointer to a struct device private.
 * @tfile: Pointer to a struct ttm_object_file on which to register the user
 * object.
 * @size: Size of the buffer object.
 * @shareable: Boolean whether the buffer is shareable with other open files.
 * @handle: Pointer to where the handle value should be assigned.
 * @p_vbo: Pointer to where the refcounted struct vmw_buffer_object pointer
 * should be assigned.
 * Return: Zero on success, negative error code on error.
 */
int vmw_user_bo_alloc(struct vmw_private *dev_priv,
		      struct ttm_object_file *tfile,
		      uint32_t size,
		      bool shareable,
		      uint32_t *handle,
		      struct vmw_buffer_object **p_vbo,
		      struct ttm_base_object **p_base)
{
	struct vmw_user_buffer_object *user_bo;
	struct ttm_buffer_object *tmp;
	int ret;

	user_bo = kzalloc(sizeof(*user_bo), GFP_KERNEL);
	if (unlikely(!user_bo)) {
		DRM_ERROR("Failed to allocate a buffer.\n");
		return -ENOMEM;
	}

	ret = vmw_bo_init(dev_priv, &user_bo->vbo, size,
			  (dev_priv->has_mob) ?
			  &vmw_sys_placement :
			  &vmw_vram_sys_placement, true,
			  &vmw_user_bo_destroy);
	if (unlikely(ret != 0))
		return ret;

	tmp = ttm_bo_reference(&user_bo->vbo.base);
	ret = ttm_prime_object_init(tfile,
				    size,
				    &user_bo->prime,
				    shareable,
				    ttm_buffer_type,
				    &vmw_user_bo_release,
				    &vmw_user_bo_ref_obj_release);
	if (unlikely(ret != 0)) {
		ttm_bo_unref(&tmp);
		goto out_no_base_object;
	}

	*p_vbo = &user_bo->vbo;
	if (p_base) {
		*p_base = &user_bo->prime.base;
		kref_get(&(*p_base)->refcount);
	}
	*handle = user_bo->prime.base.handle;

out_no_base_object:
	return ret;
}


/**
 * vmw_user_bo_verify_access - verify access permissions on this
 * buffer object.
 *
 * @bo: Pointer to the buffer object being accessed
 * @tfile: Identifying the caller.
 */
int vmw_user_bo_verify_access(struct ttm_buffer_object *bo,
			      struct ttm_object_file *tfile)
{
	struct vmw_user_buffer_object *vmw_user_bo;

	if (unlikely(bo->destroy != vmw_user_bo_destroy))
		return -EPERM;

	vmw_user_bo = vmw_user_buffer_object(bo);

	/* Check that the caller has opened the object. */
	if (likely(ttm_ref_object_exists(tfile, &vmw_user_bo->prime.base)))
		return 0;

	DRM_ERROR("Could not grant buffer access.\n");
	return -EPERM;
}


/**
 * vmw_user_bo_synccpu_grab - Grab a struct vmw_user_buffer_object for cpu
 * access, idling previous GPU operations on the buffer and optionally
 * blocking it for further command submissions.
 *
 * @user_bo: Pointer to the buffer object being grabbed for CPU access
 * @tfile: Identifying the caller.
 * @flags: Flags indicating how the grab should be performed.
 * Return: Zero on success, Negative error code on error. In particular,
 * -EBUSY will be returned if a dontblock operation is requested and the
 * buffer object is busy, and -ERESTARTSYS will be returned if a wait is
 * interrupted by a signal.
 *
 * A blocking grab will be automatically released when @tfile is closed.
 */
static int vmw_user_bo_synccpu_grab(struct vmw_user_buffer_object *user_bo,
				    struct ttm_object_file *tfile,
				    uint32_t flags)
{
	struct ttm_buffer_object *bo = &user_bo->vbo.base;
	bool existed;
	int ret;

	if (flags & drm_vmw_synccpu_allow_cs) {
		bool nonblock = !!(flags & drm_vmw_synccpu_dontblock);
		long lret;

		lret = reservation_object_wait_timeout_rcu
			(bo->resv, true, true,
			 nonblock ? 0 : MAX_SCHEDULE_TIMEOUT);
		if (!lret)
			return -EBUSY;
		else if (lret < 0)
			return lret;
		return 0;
	}

	ret = ttm_bo_synccpu_write_grab
		(bo, !!(flags & drm_vmw_synccpu_dontblock));
	if (unlikely(ret != 0))
		return ret;

	ret = ttm_ref_object_add(tfile, &user_bo->prime.base,
				 TTM_REF_SYNCCPU_WRITE, &existed, false);
	if (ret != 0 || existed)
		ttm_bo_synccpu_write_release(&user_bo->vbo.base);

	return ret;
}

/**
 * vmw_user_bo_synccpu_release - Release a previous grab for CPU access,
 * and unblock command submission on the buffer if blocked.
 *
 * @handle: Handle identifying the buffer object.
 * @tfile: Identifying the caller.
 * @flags: Flags indicating the type of release.
 */
static int vmw_user_bo_synccpu_release(uint32_t handle,
					   struct ttm_object_file *tfile,
					   uint32_t flags)
{
	if (!(flags & drm_vmw_synccpu_allow_cs))
		return ttm_ref_object_base_unref(tfile, handle,
						 TTM_REF_SYNCCPU_WRITE);

	return 0;
}


/**
 * vmw_user_bo_synccpu_ioctl - ioctl function implementing the synccpu
 * functionality.
 *
 * @dev: Identifies the drm device.
 * @data: Pointer to the ioctl argument.
 * @file_priv: Identifies the caller.
 * Return: Zero on success, negative error code on error.
 *
 * This function checks the ioctl arguments for validity and calls the
 * relevant synccpu functions.
 */
int vmw_user_bo_synccpu_ioctl(struct drm_device *dev, void *data,
			      struct drm_file *file_priv)
{
	struct drm_vmw_synccpu_arg *arg =
		(struct drm_vmw_synccpu_arg *) data;
	struct vmw_buffer_object *vbo;
	struct vmw_user_buffer_object *user_bo;
	struct ttm_object_file *tfile = vmw_fpriv(file_priv)->tfile;
	struct ttm_base_object *buffer_base;
	int ret;

	if ((arg->flags & (drm_vmw_synccpu_read | drm_vmw_synccpu_write)) == 0
	    || (arg->flags & ~(drm_vmw_synccpu_read | drm_vmw_synccpu_write |
			       drm_vmw_synccpu_dontblock |
			       drm_vmw_synccpu_allow_cs)) != 0) {
		DRM_ERROR("Illegal synccpu flags.\n");
		return -EINVAL;
	}

	switch (arg->op) {
	case drm_vmw_synccpu_grab:
		ret = vmw_user_bo_lookup(tfile, arg->handle, &vbo,
					     &buffer_base);
		if (unlikely(ret != 0))
			return ret;

		user_bo = container_of(vbo, struct vmw_user_buffer_object,
				       vbo);
		ret = vmw_user_bo_synccpu_grab(user_bo, tfile, arg->flags);
		vmw_bo_unreference(&vbo);
		ttm_base_object_unref(&buffer_base);
		if (unlikely(ret != 0 && ret != -ERESTARTSYS &&
			     ret != -EBUSY)) {
			DRM_ERROR("Failed synccpu grab on handle 0x%08x.\n",
				  (unsigned int) arg->handle);
			return ret;
		}
		break;
	case drm_vmw_synccpu_release:
		ret = vmw_user_bo_synccpu_release(arg->handle, tfile,
						  arg->flags);
		if (unlikely(ret != 0)) {
			DRM_ERROR("Failed synccpu release on handle 0x%08x.\n",
				  (unsigned int) arg->handle);
			return ret;
		}
		break;
	default:
		DRM_ERROR("Invalid synccpu operation.\n");
		return -EINVAL;
	}

	return 0;
}


/**
 * vmw_bo_alloc_ioctl - ioctl function implementing the buffer object
 * allocation functionality.
 *
 * @dev: Identifies the drm device.
 * @data: Pointer to the ioctl argument.
 * @file_priv: Identifies the caller.
 * Return: Zero on success, negative error code on error.
 *
 * This function checks the ioctl arguments for validity and allocates a
 * struct vmw_user_buffer_object bo.
 */
int vmw_bo_alloc_ioctl(struct drm_device *dev, void *data,
		       struct drm_file *file_priv)
{
	struct vmw_private *dev_priv = vmw_priv(dev);
	union drm_vmw_alloc_dmabuf_arg *arg =
	    (union drm_vmw_alloc_dmabuf_arg *)data;
	struct drm_vmw_alloc_dmabuf_req *req = &arg->req;
	struct drm_vmw_dmabuf_rep *rep = &arg->rep;
	struct vmw_buffer_object *vbo;
	uint32_t handle;
	int ret;

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

	ret = vmw_user_bo_alloc(dev_priv, vmw_fpriv(file_priv)->tfile,
				req->size, false, &handle, &vbo,
				NULL);
	if (unlikely(ret != 0))
		goto out_no_bo;

	rep->handle = handle;
	rep->map_handle = drm_vma_node_offset_addr(&vbo->base.vma_node);
	rep->cur_gmr_id = handle;
	rep->cur_gmr_offset = 0;

	vmw_bo_unreference(&vbo);

out_no_bo:
	ttm_read_unlock(&dev_priv->reservation_sem);

	return ret;
}


/**
 * vmw_bo_unref_ioctl - Generic handle close ioctl.
 *
 * @dev: Identifies the drm device.
 * @data: Pointer to the ioctl argument.
 * @file_priv: Identifies the caller.
 * Return: Zero on success, negative error code on error.
 *
 * This function checks the ioctl arguments for validity and closes a
 * handle to a TTM base object, optionally freeing the object.
 */
int vmw_bo_unref_ioctl(struct drm_device *dev, void *data,
		       struct drm_file *file_priv)
{
	struct drm_vmw_unref_dmabuf_arg *arg =
	    (struct drm_vmw_unref_dmabuf_arg *)data;

	return ttm_ref_object_base_unref(vmw_fpriv(file_priv)->tfile,
					 arg->handle,
					 TTM_REF_USAGE);
}


/**
 * vmw_user_bo_lookup - Look up a vmw user buffer object from a handle.
 *
 * @tfile: The TTM object file the handle is registered with.
 * @handle: The user buffer object handle
 * @out: Pointer to a where a pointer to the embedded
 * struct vmw_buffer_object should be placed.
 * @p_base: Pointer to where a pointer to the TTM base object should be
 * placed, or NULL if no such pointer is required.
 * Return: Zero on success, Negative error code on error.
 *
 * Both the output base object pointer and the vmw buffer object pointer
 * will be refcounted.
 */
int vmw_user_bo_lookup(struct ttm_object_file *tfile,
		       uint32_t handle, struct vmw_buffer_object **out,
		       struct ttm_base_object **p_base)
{
	struct vmw_user_buffer_object *vmw_user_bo;
	struct ttm_base_object *base;

	base = ttm_base_object_lookup(tfile, handle);
	if (unlikely(base == NULL)) {
		DRM_ERROR("Invalid buffer object handle 0x%08lx.\n",
			  (unsigned long)handle);
		return -ESRCH;
	}

	if (unlikely(ttm_base_object_type(base) != ttm_buffer_type)) {
		ttm_base_object_unref(&base);
		DRM_ERROR("Invalid buffer object handle 0x%08lx.\n",
			  (unsigned long)handle);
		return -EINVAL;
	}

	vmw_user_bo = container_of(base, struct vmw_user_buffer_object,
				   prime.base);
	(void)ttm_bo_reference(&vmw_user_bo->vbo.base);
	if (p_base)
		*p_base = base;
	else
		ttm_base_object_unref(&base);
	*out = &vmw_user_bo->vbo;

	return 0;
}

/**
 * vmw_user_bo_noref_lookup - Look up a vmw user buffer object without reference
 * @tfile: The TTM object file the handle is registered with.
 * @handle: The user buffer object handle.
 *
 * This function looks up a struct vmw_user_bo and returns a pointer to the
 * struct vmw_buffer_object it derives from without refcounting the pointer.
 * The returned pointer is only valid until vmw_user_bo_noref_release() is
 * called, and the object pointed to by the returned pointer may be doomed.
 * Any persistent usage of the object requires a refcount to be taken using
 * ttm_bo_reference_unless_doomed(). Iff this function returns successfully it
 * needs to be paired with vmw_user_bo_noref_release() and no sleeping-
 * or scheduling functions may be called inbetween these function calls.
 *
 * Return: A struct vmw_buffer_object pointer if successful or negative
 * error pointer on failure.
 */
struct vmw_buffer_object *
vmw_user_bo_noref_lookup(struct ttm_object_file *tfile, u32 handle)
{
	struct vmw_user_buffer_object *vmw_user_bo;
	struct ttm_base_object *base;

	base = ttm_base_object_noref_lookup(tfile, handle);
	if (!base) {
		DRM_ERROR("Invalid buffer object handle 0x%08lx.\n",
			  (unsigned long)handle);
		return ERR_PTR(-ESRCH);
	}

	if (unlikely(ttm_base_object_type(base) != ttm_buffer_type)) {
		ttm_base_object_noref_release();
		DRM_ERROR("Invalid buffer object handle 0x%08lx.\n",
			  (unsigned long)handle);
		return ERR_PTR(-EINVAL);
	}

	vmw_user_bo = container_of(base, struct vmw_user_buffer_object,
				   prime.base);
	return &vmw_user_bo->vbo;
}

/**
 * vmw_user_bo_reference - Open a handle to a vmw user buffer object.
 *
 * @tfile: The TTM object file to register the handle with.
 * @vbo: The embedded vmw buffer object.
 * @handle: Pointer to where the new handle should be placed.
 * Return: Zero on success, Negative error code on error.
 */
int vmw_user_bo_reference(struct ttm_object_file *tfile,
			  struct vmw_buffer_object *vbo,
			  uint32_t *handle)
{
	struct vmw_user_buffer_object *user_bo;

	if (vbo->base.destroy != vmw_user_bo_destroy)
		return -EINVAL;

	user_bo = container_of(vbo, struct vmw_user_buffer_object, vbo);

	*handle = user_bo->prime.base.handle;
	return ttm_ref_object_add(tfile, &user_bo->prime.base,
				  TTM_REF_USAGE, NULL, false);
}


/**
 * vmw_bo_fence_single - Utility function to fence a single TTM buffer
 *                       object without unreserving it.
 *
 * @bo:             Pointer to the struct ttm_buffer_object to fence.
 * @fence:          Pointer to the fence. If NULL, this function will
 *                  insert a fence into the command stream..
 *
 * Contrary to the ttm_eu version of this function, it takes only
 * a single buffer object instead of a list, and it also doesn't
 * unreserve the buffer object, which needs to be done separately.
 */
void vmw_bo_fence_single(struct ttm_buffer_object *bo,
			 struct vmw_fence_obj *fence)
{
	struct ttm_bo_device *bdev = bo->bdev;

	struct vmw_private *dev_priv =
		container_of(bdev, struct vmw_private, bdev);

	if (fence == NULL) {
		vmw_execbuf_fence_commands(NULL, dev_priv, &fence, NULL);
		reservation_object_add_excl_fence(bo->resv, &fence->base);
		dma_fence_put(&fence->base);
	} else
		reservation_object_add_excl_fence(bo->resv, &fence->base);
}


/**
 * vmw_dumb_create - Create a dumb kms buffer
 *
 * @file_priv: Pointer to a struct drm_file identifying the caller.
 * @dev: Pointer to the drm device.
 * @args: Pointer to a struct drm_mode_create_dumb structure
 * Return: Zero on success, negative error code on failure.
 *
 * This is a driver callback for the core drm create_dumb functionality.
 * Note that this is very similar to the vmw_bo_alloc ioctl, except
 * that the arguments have a different format.
 */
int vmw_dumb_create(struct drm_file *file_priv,
		    struct drm_device *dev,
		    struct drm_mode_create_dumb *args)
{
	struct vmw_private *dev_priv = vmw_priv(dev);
	struct vmw_buffer_object *vbo;
	int ret;

	args->pitch = args->width * ((args->bpp + 7) / 8);
	args->size = args->pitch * args->height;

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

	ret = vmw_user_bo_alloc(dev_priv, vmw_fpriv(file_priv)->tfile,
				    args->size, false, &args->handle,
				    &vbo, NULL);
	if (unlikely(ret != 0))
		goto out_no_bo;

	vmw_bo_unreference(&vbo);
out_no_bo:
	ttm_read_unlock(&dev_priv->reservation_sem);
	return ret;
}


/**
 * vmw_dumb_map_offset - Return the address space offset of a dumb buffer
 *
 * @file_priv: Pointer to a struct drm_file identifying the caller.
 * @dev: Pointer to the drm device.
 * @handle: Handle identifying the dumb buffer.
 * @offset: The address space offset returned.
 * Return: Zero on success, negative error code on failure.
 *
 * This is a driver callback for the core drm dumb_map_offset functionality.
 */
int vmw_dumb_map_offset(struct drm_file *file_priv,
			struct drm_device *dev, uint32_t handle,
			uint64_t *offset)
{
	struct ttm_object_file *tfile = vmw_fpriv(file_priv)->tfile;
	struct vmw_buffer_object *out_buf;
	int ret;

	ret = vmw_user_bo_lookup(tfile, handle, &out_buf, NULL);
	if (ret != 0)
		return -EINVAL;

	*offset = drm_vma_node_offset_addr(&out_buf->base.vma_node);
	vmw_bo_unreference(&out_buf);
	return 0;
}


/**
 * vmw_dumb_destroy - Destroy a dumb boffer
 *
 * @file_priv: Pointer to a struct drm_file identifying the caller.
 * @dev: Pointer to the drm device.
 * @handle: Handle identifying the dumb buffer.
 * Return: Zero on success, negative error code on failure.
 *
 * This is a driver callback for the core drm dumb_destroy functionality.
 */
int vmw_dumb_destroy(struct drm_file *file_priv,
		     struct drm_device *dev,
		     uint32_t handle)
{
	return ttm_ref_object_base_unref(vmw_fpriv(file_priv)->tfile,
					 handle, TTM_REF_USAGE);
}


/**
 * vmw_bo_swap_notify - swapout notify callback.
 *
 * @bo: The buffer object to be swapped out.
 */
void vmw_bo_swap_notify(struct ttm_buffer_object *bo)
{
	/* Is @bo embedded in a struct vmw_buffer_object? */
	if (bo->destroy != vmw_bo_bo_free &&
	    bo->destroy != vmw_user_bo_destroy)
		return;

	/* Kill any cached kernel maps before swapout */
	vmw_bo_unmap(vmw_buffer_object(bo));
}


/**
 * vmw_bo_move_notify - TTM move_notify_callback
 *
 * @bo: The TTM buffer object about to move.
 * @mem: The struct ttm_mem_reg indicating to what memory
 *       region the move is taking place.
 *
 * Detaches cached maps and device bindings that require that the
 * buffer doesn't move.
 */
void vmw_bo_move_notify(struct ttm_buffer_object *bo,
			struct ttm_mem_reg *mem)
{
	struct vmw_buffer_object *vbo;

	if (mem == NULL)
		return;

	/* Make sure @bo is embedded in a struct vmw_buffer_object? */
	if (bo->destroy != vmw_bo_bo_free &&
	    bo->destroy != vmw_user_bo_destroy)
		return;

	vbo = container_of(bo, struct vmw_buffer_object, base);

	/*
	 * Kill any cached kernel maps before move to or from VRAM.
	 * With other types of moves, the underlying pages stay the same,
	 * and the map can be kept.
	 */
	if (mem->mem_type == TTM_PL_VRAM || bo->mem.mem_type == TTM_PL_VRAM)
		vmw_bo_unmap(vbo);

	/*
	 * If we're moving a backup MOB out of MOB placement, then make sure we
	 * read back all resource content first, and unbind the MOB from
	 * the resource.
	 */
	if (mem->mem_type != VMW_PL_MOB && bo->mem.mem_type == VMW_PL_MOB)
		vmw_resource_unbind_list(vbo);
}