summaryrefslogtreecommitdiffstats
path: root/drivers/gpu/drm/vmwgfx/vmwgfx_resource.c
blob: bc784254e78ef60db12eb5922d7babaa50d9ff17 (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
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
/**************************************************************************
 *
 * Copyright © 2009 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 <drm/vmwgfx_drm.h>
#include <drm/ttm/ttm_object.h>
#include <drm/ttm/ttm_placement.h>
#include <drm/drmP.h>
#include "vmwgfx_resource_priv.h"

struct vmw_user_dma_buffer {
	struct ttm_base_object base;
	struct vmw_dma_buffer dma;
};

struct vmw_bo_user_rep {
	uint32_t handle;
	uint64_t map_handle;
};

struct vmw_stream {
	struct vmw_resource res;
	uint32_t stream_id;
};

struct vmw_user_stream {
	struct ttm_base_object base;
	struct vmw_stream stream;
};


static uint64_t vmw_user_stream_size;

static const struct vmw_res_func vmw_stream_func = {
	.res_type = vmw_res_stream,
	.needs_backup = false,
	.may_evict = false,
	.type_name = "video streams",
	.backup_placement = NULL,
	.create = NULL,
	.destroy = NULL,
	.bind = NULL,
	.unbind = NULL
};

static inline struct vmw_dma_buffer *
vmw_dma_buffer(struct ttm_buffer_object *bo)
{
	return container_of(bo, struct vmw_dma_buffer, base);
}

static inline struct vmw_user_dma_buffer *
vmw_user_dma_buffer(struct ttm_buffer_object *bo)
{
	struct vmw_dma_buffer *vmw_bo = vmw_dma_buffer(bo);
	return container_of(vmw_bo, struct vmw_user_dma_buffer, dma);
}

struct vmw_resource *vmw_resource_reference(struct vmw_resource *res)
{
	kref_get(&res->kref);
	return res;
}


/**
 * vmw_resource_release_id - release a resource id to the id manager.
 *
 * @res: Pointer to the resource.
 *
 * Release the resource id to the resource id manager and set it to -1
 */
void vmw_resource_release_id(struct vmw_resource *res)
{
	struct vmw_private *dev_priv = res->dev_priv;
	struct idr *idr = &dev_priv->res_idr[res->func->res_type];

	write_lock(&dev_priv->resource_lock);
	if (res->id != -1)
		idr_remove(idr, res->id);
	res->id = -1;
	write_unlock(&dev_priv->resource_lock);
}

static void vmw_resource_release(struct kref *kref)
{
	struct vmw_resource *res =
	    container_of(kref, struct vmw_resource, kref);
	struct vmw_private *dev_priv = res->dev_priv;
	int id;
	struct idr *idr = &dev_priv->res_idr[res->func->res_type];

	res->avail = false;
	list_del_init(&res->lru_head);
	write_unlock(&dev_priv->resource_lock);
	if (res->backup) {
		struct ttm_buffer_object *bo = &res->backup->base;

		ttm_bo_reserve(bo, false, false, false, 0);
		if (!list_empty(&res->mob_head) &&
		    res->func->unbind != NULL) {
			struct ttm_validate_buffer val_buf;

			val_buf.bo = bo;
			res->func->unbind(res, false, &val_buf);
		}
		res->backup_dirty = false;
		list_del_init(&res->mob_head);
		ttm_bo_unreserve(bo);
		vmw_dmabuf_unreference(&res->backup);
	}

	if (likely(res->hw_destroy != NULL))
		res->hw_destroy(res);

	id = res->id;
	if (res->res_free != NULL)
		res->res_free(res);
	else
		kfree(res);

	write_lock(&dev_priv->resource_lock);

	if (id != -1)
		idr_remove(idr, id);
}

void vmw_resource_unreference(struct vmw_resource **p_res)
{
	struct vmw_resource *res = *p_res;
	struct vmw_private *dev_priv = res->dev_priv;

	*p_res = NULL;
	write_lock(&dev_priv->resource_lock);
	kref_put(&res->kref, vmw_resource_release);
	write_unlock(&dev_priv->resource_lock);
}


/**
 * vmw_resource_alloc_id - release a resource id to the id manager.
 *
 * @res: Pointer to the resource.
 *
 * Allocate the lowest free resource from the resource manager, and set
 * @res->id to that id. Returns 0 on success and -ENOMEM on failure.
 */
int vmw_resource_alloc_id(struct vmw_resource *res)
{
	struct vmw_private *dev_priv = res->dev_priv;
	int ret;
	struct idr *idr = &dev_priv->res_idr[res->func->res_type];

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

	idr_preload(GFP_KERNEL);
	write_lock(&dev_priv->resource_lock);

	ret = idr_alloc(idr, res, 1, 0, GFP_NOWAIT);
	if (ret >= 0)
		res->id = ret;

	write_unlock(&dev_priv->resource_lock);
	idr_preload_end();
	return ret < 0 ? ret : 0;
}

/**
 * vmw_resource_init - initialize a struct vmw_resource
 *
 * @dev_priv:       Pointer to a device private struct.
 * @res:            The struct vmw_resource to initialize.
 * @obj_type:       Resource object type.
 * @delay_id:       Boolean whether to defer device id allocation until
 *                  the first validation.
 * @res_free:       Resource destructor.
 * @func:           Resource function table.
 */
int vmw_resource_init(struct vmw_private *dev_priv, struct vmw_resource *res,
		      bool delay_id,
		      void (*res_free) (struct vmw_resource *res),
		      const struct vmw_res_func *func)
{
	kref_init(&res->kref);
	res->hw_destroy = NULL;
	res->res_free = res_free;
	res->avail = false;
	res->dev_priv = dev_priv;
	res->func = func;
	INIT_LIST_HEAD(&res->lru_head);
	INIT_LIST_HEAD(&res->mob_head);
	res->id = -1;
	res->backup = NULL;
	res->backup_offset = 0;
	res->backup_dirty = false;
	res->res_dirty = false;
	if (delay_id)
		return 0;
	else
		return vmw_resource_alloc_id(res);
}

/**
 * vmw_resource_activate
 *
 * @res:        Pointer to the newly created resource
 * @hw_destroy: Destroy function. NULL if none.
 *
 * Activate a resource after the hardware has been made aware of it.
 * Set tye destroy function to @destroy. Typically this frees the
 * resource and destroys the hardware resources associated with it.
 * Activate basically means that the function vmw_resource_lookup will
 * find it.
 */
void vmw_resource_activate(struct vmw_resource *res,
			   void (*hw_destroy) (struct vmw_resource *))
{
	struct vmw_private *dev_priv = res->dev_priv;

	write_lock(&dev_priv->resource_lock);
	res->avail = true;
	res->hw_destroy = hw_destroy;
	write_unlock(&dev_priv->resource_lock);
}

struct vmw_resource *vmw_resource_lookup(struct vmw_private *dev_priv,
					 struct idr *idr, int id)
{
	struct vmw_resource *res;

	read_lock(&dev_priv->resource_lock);
	res = idr_find(idr, id);
	if (res && res->avail)
		kref_get(&res->kref);
	else
		res = NULL;
	read_unlock(&dev_priv->resource_lock);

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

	return res;
}

/**
 * vmw_user_resource_lookup_handle - lookup a struct resource from a
 * TTM user-space handle and perform basic type checks
 *
 * @dev_priv:     Pointer to a device private struct
 * @tfile:        Pointer to a struct ttm_object_file identifying the caller
 * @handle:       The TTM user-space handle
 * @converter:    Pointer to an object describing the resource type
 * @p_res:        On successful return the location pointed to will contain
 *                a pointer to a refcounted struct vmw_resource.
 *
 * If the handle can't be found or is associated with an incorrect resource
 * type, -EINVAL will be returned.
 */
int vmw_user_resource_lookup_handle(struct vmw_private *dev_priv,
				    struct ttm_object_file *tfile,
				    uint32_t handle,
				    const struct vmw_user_resource_conv
				    *converter,
				    struct vmw_resource **p_res)
{
	struct ttm_base_object *base;
	struct vmw_resource *res;
	int ret = -EINVAL;

	base = ttm_base_object_lookup(tfile, handle);
	if (unlikely(base == NULL))
		return -EINVAL;

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

	res = converter->base_obj_to_res(base);

	read_lock(&dev_priv->resource_lock);
	if (!res->avail || res->res_free != converter->res_free) {
		read_unlock(&dev_priv->resource_lock);
		goto out_bad_resource;
	}

	kref_get(&res->kref);
	read_unlock(&dev_priv->resource_lock);

	*p_res = res;
	ret = 0;

out_bad_resource:
	ttm_base_object_unref(&base);

	return ret;
}

/**
 * Helper function that looks either a surface or dmabuf.
 *
 * The pointer this pointed at by out_surf and out_buf needs to be null.
 */
int vmw_user_lookup_handle(struct vmw_private *dev_priv,
			   struct ttm_object_file *tfile,
			   uint32_t handle,
			   struct vmw_surface **out_surf,
			   struct vmw_dma_buffer **out_buf)
{
	struct vmw_resource *res;
	int ret;

	BUG_ON(*out_surf || *out_buf);

	ret = vmw_user_resource_lookup_handle(dev_priv, tfile, handle,
					      user_surface_converter,
					      &res);
	if (!ret) {
		*out_surf = vmw_res_to_srf(res);
		return 0;
	}

	*out_surf = NULL;
	ret = vmw_user_dmabuf_lookup(tfile, handle, out_buf);
	return ret;
}

/**
 * Buffer management.
 */
void vmw_dmabuf_bo_free(struct ttm_buffer_object *bo)
{
	struct vmw_dma_buffer *vmw_bo = vmw_dma_buffer(bo);

	kfree(vmw_bo);
}

int vmw_dmabuf_init(struct vmw_private *dev_priv,
		    struct vmw_dma_buffer *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;

	BUG_ON(!bo_free);

	acc_size = ttm_bo_acc_size(bdev, size, sizeof(struct vmw_dma_buffer));
	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,
			  NULL, acc_size, NULL, bo_free);
	return ret;
}

static void vmw_user_dmabuf_destroy(struct ttm_buffer_object *bo)
{
	struct vmw_user_dma_buffer *vmw_user_bo = vmw_user_dma_buffer(bo);

	ttm_base_object_kfree(vmw_user_bo, base);
}

static void vmw_user_dmabuf_release(struct ttm_base_object **p_base)
{
	struct vmw_user_dma_buffer *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_dma_buffer, base);
	bo = &vmw_user_bo->dma.base;
	ttm_bo_unref(&bo);
}

/**
 * vmw_user_dmabuf_alloc - Allocate a user dma buffer
 *
 * @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 dma buffer.
 * @shareable: Boolean whether the buffer is shareable with other open files.
 * @handle: Pointer to where the handle value should be assigned.
 * @p_dma_buf: Pointer to where the refcounted struct vmw_dma_buffer pointer
 * should be assigned.
 */
int vmw_user_dmabuf_alloc(struct vmw_private *dev_priv,
			  struct ttm_object_file *tfile,
			  uint32_t size,
			  bool shareable,
			  uint32_t *handle,
			  struct vmw_dma_buffer **p_dma_buf)
{
	struct vmw_user_dma_buffer *user_bo;
	struct ttm_buffer_object *tmp;
	int ret;

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

	ret = vmw_dmabuf_init(dev_priv, &user_bo->dma, size,
			      &vmw_vram_sys_placement, true,
			      &vmw_user_dmabuf_destroy);
	if (unlikely(ret != 0))
		return ret;

	tmp = ttm_bo_reference(&user_bo->dma.base);
	ret = ttm_base_object_init(tfile,
				   &user_bo->base,
				   shareable,
				   ttm_buffer_type,
				   &vmw_user_dmabuf_release, NULL);
	if (unlikely(ret != 0)) {
		ttm_bo_unref(&tmp);
		goto out_no_base_object;
	}

	*p_dma_buf = &user_bo->dma;
	*handle = user_bo->base.hash.key;

out_no_base_object:
	return ret;
}

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

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

	vmw_user_bo = vmw_user_dma_buffer(bo);
	return (vmw_user_bo->base.tfile == tfile ||
	vmw_user_bo->base.shareable) ? 0 : -EPERM;
}

int vmw_dmabuf_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_dma_buffer *dma_buf;
	uint32_t handle;
	struct vmw_master *vmaster = vmw_master(file_priv->master);
	int ret;

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

	ret = vmw_user_dmabuf_alloc(dev_priv, vmw_fpriv(file_priv)->tfile,
				    req->size, false, &handle, &dma_buf);
	if (unlikely(ret != 0))
		goto out_no_dmabuf;

	rep->handle = handle;
	rep->map_handle = dma_buf->base.addr_space_offset;
	rep->cur_gmr_id = handle;
	rep->cur_gmr_offset = 0;

	vmw_dmabuf_unreference(&dma_buf);

out_no_dmabuf:
	ttm_read_unlock(&vmaster->lock);

	return ret;
}

int vmw_dmabuf_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);
}

int vmw_user_dmabuf_lookup(struct ttm_object_file *tfile,
			   uint32_t handle, struct vmw_dma_buffer **out)
{
	struct vmw_user_dma_buffer *vmw_user_bo;
	struct ttm_base_object *base;

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

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

	vmw_user_bo = container_of(base, struct vmw_user_dma_buffer, base);
	(void)ttm_bo_reference(&vmw_user_bo->dma.base);
	ttm_base_object_unref(&base);
	*out = &vmw_user_bo->dma;

	return 0;
}

int vmw_user_dmabuf_reference(struct ttm_object_file *tfile,
			      struct vmw_dma_buffer *dma_buf)
{
	struct vmw_user_dma_buffer *user_bo;

	if (dma_buf->base.destroy != vmw_user_dmabuf_destroy)
		return -EINVAL;

	user_bo = container_of(dma_buf, struct vmw_user_dma_buffer, dma);
	return ttm_ref_object_add(tfile, &user_bo->base, TTM_REF_USAGE, NULL);
}

/*
 * Stream management
 */

static void vmw_stream_destroy(struct vmw_resource *res)
{
	struct vmw_private *dev_priv = res->dev_priv;
	struct vmw_stream *stream;
	int ret;

	DRM_INFO("%s: unref\n", __func__);
	stream = container_of(res, struct vmw_stream, res);

	ret = vmw_overlay_unref(dev_priv, stream->stream_id);
	WARN_ON(ret != 0);
}

static int vmw_stream_init(struct vmw_private *dev_priv,
			   struct vmw_stream *stream,
			   void (*res_free) (struct vmw_resource *res))
{
	struct vmw_resource *res = &stream->res;
	int ret;

	ret = vmw_resource_init(dev_priv, res, false, res_free,
				&vmw_stream_func);

	if (unlikely(ret != 0)) {
		if (res_free == NULL)
			kfree(stream);
		else
			res_free(&stream->res);
		return ret;
	}

	ret = vmw_overlay_claim(dev_priv, &stream->stream_id);
	if (ret) {
		vmw_resource_unreference(&res);
		return ret;
	}

	DRM_INFO("%s: claimed\n", __func__);

	vmw_resource_activate(&stream->res, vmw_stream_destroy);
	return 0;
}

static void vmw_user_stream_free(struct vmw_resource *res)
{
	struct vmw_user_stream *stream =
	    container_of(res, struct vmw_user_stream, stream.res);
	struct vmw_private *dev_priv = res->dev_priv;

	ttm_base_object_kfree(stream, base);
	ttm_mem_global_free(vmw_mem_glob(dev_priv),
			    vmw_user_stream_size);
}

/**
 * This function is called when user space has no more references on the
 * base object. It releases the base-object's reference on the resource object.
 */

static void vmw_user_stream_base_release(struct ttm_base_object **p_base)
{
	struct ttm_base_object *base = *p_base;
	struct vmw_user_stream *stream =
	    container_of(base, struct vmw_user_stream, base);
	struct vmw_resource *res = &stream->stream.res;

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

int vmw_stream_unref_ioctl(struct drm_device *dev, void *data,
			   struct drm_file *file_priv)
{
	struct vmw_private *dev_priv = vmw_priv(dev);
	struct vmw_resource *res;
	struct vmw_user_stream *stream;
	struct drm_vmw_stream_arg *arg = (struct drm_vmw_stream_arg *)data;
	struct ttm_object_file *tfile = vmw_fpriv(file_priv)->tfile;
	struct idr *idr = &dev_priv->res_idr[vmw_res_stream];
	int ret = 0;


	res = vmw_resource_lookup(dev_priv, idr, arg->stream_id);
	if (unlikely(res == NULL))
		return -EINVAL;

	if (res->res_free != &vmw_user_stream_free) {
		ret = -EINVAL;
		goto out;
	}

	stream = container_of(res, struct vmw_user_stream, stream.res);
	if (stream->base.tfile != tfile) {
		ret = -EINVAL;
		goto out;
	}

	ttm_ref_object_base_unref(tfile, stream->base.hash.key, TTM_REF_USAGE);
out:
	vmw_resource_unreference(&res);
	return ret;
}

int vmw_stream_claim_ioctl(struct drm_device *dev, void *data,
			   struct drm_file *file_priv)
{
	struct vmw_private *dev_priv = vmw_priv(dev);
	struct vmw_user_stream *stream;
	struct vmw_resource *res;
	struct vmw_resource *tmp;
	struct drm_vmw_stream_arg *arg = (struct drm_vmw_stream_arg *)data;
	struct ttm_object_file *tfile = vmw_fpriv(file_priv)->tfile;
	struct vmw_master *vmaster = vmw_master(file_priv->master);
	int ret;

	/*
	 * Approximate idr memory usage with 128 bytes. It will be limited
	 * by maximum number_of streams anyway?
	 */

	if (unlikely(vmw_user_stream_size == 0))
		vmw_user_stream_size = ttm_round_pot(sizeof(*stream)) + 128;

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

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


	stream = kmalloc(sizeof(*stream), GFP_KERNEL);
	if (unlikely(stream == NULL)) {
		ttm_mem_global_free(vmw_mem_glob(dev_priv),
				    vmw_user_stream_size);
		ret = -ENOMEM;
		goto out_unlock;
	}

	res = &stream->stream.res;
	stream->base.shareable = false;
	stream->base.tfile = NULL;

	/*
	 * From here on, the destructor takes over resource freeing.
	 */

	ret = vmw_stream_init(dev_priv, &stream->stream, vmw_user_stream_free);
	if (unlikely(ret != 0))
		goto out_unlock;

	tmp = vmw_resource_reference(res);
	ret = ttm_base_object_init(tfile, &stream->base, false, VMW_RES_STREAM,
				   &vmw_user_stream_base_release, NULL);

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

	arg->stream_id = res->id;
out_err:
	vmw_resource_unreference(&res);
out_unlock:
	ttm_read_unlock(&vmaster->lock);
	return ret;
}

int vmw_user_stream_lookup(struct vmw_private *dev_priv,
			   struct ttm_object_file *tfile,
			   uint32_t *inout_id, struct vmw_resource **out)
{
	struct vmw_user_stream *stream;
	struct vmw_resource *res;
	int ret;

	res = vmw_resource_lookup(dev_priv, &dev_priv->res_idr[vmw_res_stream],
				  *inout_id);
	if (unlikely(res == NULL))
		return -EINVAL;

	if (res->res_free != &vmw_user_stream_free) {
		ret = -EINVAL;
		goto err_ref;
	}

	stream = container_of(res, struct vmw_user_stream, stream.res);
	if (stream->base.tfile != tfile) {
		ret = -EPERM;
		goto err_ref;
	}

	*inout_id = stream->stream.stream_id;
	*out = res;
	return 0;
err_ref:
	vmw_resource_unreference(&res);
	return ret;
}


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_master *vmaster = vmw_master(file_priv->master);
	struct vmw_user_dma_buffer *vmw_user_bo;
	struct ttm_buffer_object *tmp;
	int ret;

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

	vmw_user_bo = kzalloc(sizeof(*vmw_user_bo), GFP_KERNEL);
	if (vmw_user_bo == NULL)
		return -ENOMEM;

	ret = ttm_read_lock(&vmaster->lock, true);
	if (ret != 0) {
		kfree(vmw_user_bo);
		return ret;
	}

	ret = vmw_dmabuf_init(dev_priv, &vmw_user_bo->dma, args->size,
			      &vmw_vram_sys_placement, true,
			      &vmw_user_dmabuf_destroy);
	if (ret != 0)
		goto out_no_dmabuf;

	tmp = ttm_bo_reference(&vmw_user_bo->dma.base);
	ret = ttm_base_object_init(vmw_fpriv(file_priv)->tfile,
				   &vmw_user_bo->base,
				   false,
				   ttm_buffer_type,
				   &vmw_user_dmabuf_release, NULL);
	if (unlikely(ret != 0))
		goto out_no_base_object;

	args->handle = vmw_user_bo->base.hash.key;

out_no_base_object:
	ttm_bo_unref(&tmp);
out_no_dmabuf:
	ttm_read_unlock(&vmaster->lock);
	return ret;
}

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_dma_buffer *out_buf;
	int ret;

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

	*offset = out_buf->base.addr_space_offset;
	vmw_dmabuf_unreference(&out_buf);
	return 0;
}

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_resource_buf_alloc - Allocate a backup buffer for a resource.
 *
 * @res:            The resource for which to allocate a backup buffer.
 * @interruptible:  Whether any sleeps during allocation should be
 *                  performed while interruptible.
 */
static int vmw_resource_buf_alloc(struct vmw_resource *res,
				  bool interruptible)
{
	unsigned long size =
		(res->backup_size + PAGE_SIZE - 1) & PAGE_MASK;
	struct vmw_dma_buffer *backup;
	int ret;

	if (likely(res->backup)) {
		BUG_ON(res->backup->base.num_pages * PAGE_SIZE < size);
		return 0;
	}

	backup = kzalloc(sizeof(*backup), GFP_KERNEL);
	if (unlikely(backup == NULL))
		return -ENOMEM;

	ret = vmw_dmabuf_init(res->dev_priv, backup, res->backup_size,
			      res->func->backup_placement,
			      interruptible,
			      &vmw_dmabuf_bo_free);
	if (unlikely(ret != 0))
		goto out_no_dmabuf;

	res->backup = backup;

out_no_dmabuf:
	return ret;
}

/**
 * vmw_resource_do_validate - Make a resource up-to-date and visible
 *                            to the device.
 *
 * @res:            The resource to make visible to the device.
 * @val_buf:        Information about a buffer possibly
 *                  containing backup data if a bind operation is needed.
 *
 * On hardware resource shortage, this function returns -EBUSY and
 * should be retried once resources have been freed up.
 */
static int vmw_resource_do_validate(struct vmw_resource *res,
				    struct ttm_validate_buffer *val_buf)
{
	int ret = 0;
	const struct vmw_res_func *func = res->func;

	if (unlikely(res->id == -1)) {
		ret = func->create(res);
		if (unlikely(ret != 0))
			return ret;
	}

	if (func->bind &&
	    ((func->needs_backup && list_empty(&res->mob_head) &&
	      val_buf->bo != NULL) ||
	     (!func->needs_backup && val_buf->bo != NULL))) {
		ret = func->bind(res, val_buf);
		if (unlikely(ret != 0))
			goto out_bind_failed;
		if (func->needs_backup)
			list_add_tail(&res->mob_head, &res->backup->res_list);
	}

	/*
	 * Only do this on write operations, and move to
	 * vmw_resource_unreserve if it can be called after
	 * backup buffers have been unreserved. Otherwise
	 * sort out locking.
	 */
	res->res_dirty = true;

	return 0;

out_bind_failed:
	func->destroy(res);

	return ret;
}

/**
 * vmw_resource_unreserve - Unreserve a resource previously reserved for
 * command submission.
 *
 * @res:               Pointer to the struct vmw_resource to unreserve.
 * @new_backup:        Pointer to new backup buffer if command submission
 *                     switched.
 * @new_backup_offset: New backup offset if @new_backup is !NULL.
 *
 * Currently unreserving a resource means putting it back on the device's
 * resource lru list, so that it can be evicted if necessary.
 */
void vmw_resource_unreserve(struct vmw_resource *res,
			    struct vmw_dma_buffer *new_backup,
			    unsigned long new_backup_offset)
{
	struct vmw_private *dev_priv = res->dev_priv;

	if (!list_empty(&res->lru_head))
		return;

	if (new_backup && new_backup != res->backup) {

		if (res->backup) {
			BUG_ON(!ttm_bo_is_reserved(&res->backup->base));
			list_del_init(&res->mob_head);
			vmw_dmabuf_unreference(&res->backup);
		}

		res->backup = vmw_dmabuf_reference(new_backup);
		BUG_ON(!ttm_bo_is_reserved(&new_backup->base));
		list_add_tail(&res->mob_head, &new_backup->res_list);
	}
	if (new_backup)
		res->backup_offset = new_backup_offset;

	if (!res->func->may_evict)
		return;

	write_lock(&dev_priv->resource_lock);
	list_add_tail(&res->lru_head,
		      &res->dev_priv->res_lru[res->func->res_type]);
	write_unlock(&dev_priv->resource_lock);
}

/**
 * vmw_resource_check_buffer - Check whether a backup buffer is needed
 *                             for a resource and in that case, allocate
 *                             one, reserve and validate it.
 *
 * @res:            The resource for which to allocate a backup buffer.
 * @interruptible:  Whether any sleeps during allocation should be
 *                  performed while interruptible.
 * @val_buf:        On successful return contains data about the
 *                  reserved and validated backup buffer.
 */
int vmw_resource_check_buffer(struct vmw_resource *res,
			      bool interruptible,
			      struct ttm_validate_buffer *val_buf)
{
	struct list_head val_list;
	bool backup_dirty = false;
	int ret;

	if (unlikely(res->backup == NULL)) {
		ret = vmw_resource_buf_alloc(res, interruptible);
		if (unlikely(ret != 0))
			return ret;
	}

	INIT_LIST_HEAD(&val_list);
	val_buf->bo = ttm_bo_reference(&res->backup->base);
	list_add_tail(&val_buf->head, &val_list);
	ret = ttm_eu_reserve_buffers(&val_list);
	if (unlikely(ret != 0))
		goto out_no_reserve;

	if (res->func->needs_backup && list_empty(&res->mob_head))
		return 0;

	backup_dirty = res->backup_dirty;
	ret = ttm_bo_validate(&res->backup->base,
			      res->func->backup_placement,
			      true, false);

	if (unlikely(ret != 0))
		goto out_no_validate;

	return 0;

out_no_validate:
	ttm_eu_backoff_reservation(&val_list);
out_no_reserve:
	ttm_bo_unref(&val_buf->bo);
	if (backup_dirty)
		vmw_dmabuf_unreference(&res->backup);

	return ret;
}

/**
 * vmw_resource_reserve - Reserve a resource for command submission
 *
 * @res:            The resource to reserve.
 *
 * This function takes the resource off the LRU list and make sure
 * a backup buffer is present for guest-backed resources. However,
 * the buffer may not be bound to the resource at this point.
 *
 */
int vmw_resource_reserve(struct vmw_resource *res, bool no_backup)
{
	struct vmw_private *dev_priv = res->dev_priv;
	int ret;

	write_lock(&dev_priv->resource_lock);
	list_del_init(&res->lru_head);
	write_unlock(&dev_priv->resource_lock);

	if (res->func->needs_backup && res->backup == NULL &&
	    !no_backup) {
		ret = vmw_resource_buf_alloc(res, true);
		if (unlikely(ret != 0))
			return ret;
	}

	return 0;
}

/**
 * vmw_resource_backoff_reservation - Unreserve and unreference a
 *                                    backup buffer
 *.
 * @val_buf:        Backup buffer information.
 */
void vmw_resource_backoff_reservation(struct ttm_validate_buffer *val_buf)
{
	struct list_head val_list;

	if (likely(val_buf->bo == NULL))
		return;

	INIT_LIST_HEAD(&val_list);
	list_add_tail(&val_buf->head, &val_list);
	ttm_eu_backoff_reservation(&val_list);
	ttm_bo_unref(&val_buf->bo);
}

/**
 * vmw_resource_do_evict - Evict a resource, and transfer its data
 *                         to a backup buffer.
 *
 * @res:            The resource to evict.
 */
int vmw_resource_do_evict(struct vmw_resource *res)
{
	struct ttm_validate_buffer val_buf;
	const struct vmw_res_func *func = res->func;
	int ret;

	BUG_ON(!func->may_evict);

	val_buf.bo = NULL;
	ret = vmw_resource_check_buffer(res, true, &val_buf);
	if (unlikely(ret != 0))
		return ret;

	if (unlikely(func->unbind != NULL &&
		     (!func->needs_backup || !list_empty(&res->mob_head)))) {
		ret = func->unbind(res, res->res_dirty, &val_buf);
		if (unlikely(ret != 0))
			goto out_no_unbind;
		list_del_init(&res->mob_head);
	}
	ret = func->destroy(res);
	res->backup_dirty = true;
	res->res_dirty = false;
out_no_unbind:
	vmw_resource_backoff_reservation(&val_buf);

	return ret;
}


/**
 * vmw_resource_validate - Make a resource up-to-date and visible
 *                         to the device.
 *
 * @res:            The resource to make visible to the device.
 *
 * On succesful return, any backup DMA buffer pointed to by @res->backup will
 * be reserved and validated.
 * On hardware resource shortage, this function will repeatedly evict
 * resources of the same type until the validation succeeds.
 */
int vmw_resource_validate(struct vmw_resource *res)
{
	int ret;
	struct vmw_resource *evict_res;
	struct vmw_private *dev_priv = res->dev_priv;
	struct list_head *lru_list = &dev_priv->res_lru[res->func->res_type];
	struct ttm_validate_buffer val_buf;

	if (likely(!res->func->may_evict))
		return 0;

	val_buf.bo = NULL;
	if (res->backup)
		val_buf.bo = &res->backup->base;
	do {
		ret = vmw_resource_do_validate(res, &val_buf);
		if (likely(ret != -EBUSY))
			break;

		write_lock(&dev_priv->resource_lock);
		if (list_empty(lru_list) || !res->func->may_evict) {
			DRM_ERROR("Out of device device id entries "
				  "for %s.\n", res->func->type_name);
			ret = -EBUSY;
			write_unlock(&dev_priv->resource_lock);
			break;
		}

		evict_res = vmw_resource_reference
			(list_first_entry(lru_list, struct vmw_resource,
					  lru_head));
		list_del_init(&evict_res->lru_head);

		write_unlock(&dev_priv->resource_lock);
		vmw_resource_do_evict(evict_res);
		vmw_resource_unreference(&evict_res);
	} while (1);

	if (unlikely(ret != 0))
		goto out_no_validate;
	else if (!res->func->needs_backup && res->backup) {
		list_del_init(&res->mob_head);
		vmw_dmabuf_unreference(&res->backup);
	}

	return 0;

out_no_validate:
	return ret;
}

/**
 * vmw_fence_single_bo - 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_fence_single_bo(struct ttm_buffer_object *bo,
			 struct vmw_fence_obj *fence)
{
	struct ttm_bo_device *bdev = bo->bdev;
	struct ttm_bo_driver *driver = bdev->driver;
	struct vmw_fence_obj *old_fence_obj;
	struct vmw_private *dev_priv =
		container_of(bdev, struct vmw_private, bdev);

	if (fence == NULL)
		vmw_execbuf_fence_commands(NULL, dev_priv, &fence, NULL);
	else
		driver->sync_obj_ref(fence);

	spin_lock(&bdev->fence_lock);

	old_fence_obj = bo->sync_obj;
	bo->sync_obj = fence;

	spin_unlock(&bdev->fence_lock);

	if (old_fence_obj)
		vmw_fence_obj_unreference(&old_fence_obj);
}

/**
 * vmw_resource_move_notify - TTM move_notify_callback
 *
 * @bo:             The TTM buffer object about to move.
 * @mem:            The truct ttm_mem_reg indicating to what memory
 *                  region the move is taking place.
 *
 * For now does nothing.
 */
void vmw_resource_move_notify(struct ttm_buffer_object *bo,
			      struct ttm_mem_reg *mem)
{
}

/**
 * vmw_resource_needs_backup - Return whether a resource needs a backup buffer.
 *
 * @res:            The resource being queried.
 */
bool vmw_resource_needs_backup(const struct vmw_resource *res)
{
	return res->func->needs_backup;
}

/**
 * vmw_resource_evict_type - Evict all resources of a specific type
 *
 * @dev_priv:       Pointer to a device private struct
 * @type:           The resource type to evict
 *
 * To avoid thrashing starvation or as part of the hibernation sequence,
 * evict all evictable resources of a specific type.
 */
static void vmw_resource_evict_type(struct vmw_private *dev_priv,
				    enum vmw_res_type type)
{
	struct list_head *lru_list = &dev_priv->res_lru[type];
	struct vmw_resource *evict_res;

	do {
		write_lock(&dev_priv->resource_lock);

		if (list_empty(lru_list))
			goto out_unlock;

		evict_res = vmw_resource_reference(
			list_first_entry(lru_list, struct vmw_resource,
					 lru_head));
		list_del_init(&evict_res->lru_head);
		write_unlock(&dev_priv->resource_lock);
		vmw_resource_do_evict(evict_res);
		vmw_resource_unreference(&evict_res);
	} while (1);

out_unlock:
	write_unlock(&dev_priv->resource_lock);
}

/**
 * vmw_resource_evict_all - Evict all evictable resources
 *
 * @dev_priv:       Pointer to a device private struct
 *
 * To avoid thrashing starvation or as part of the hibernation sequence,
 * evict all evictable resources. In particular this means that all
 * guest-backed resources that are registered with the device are
 * evicted and the OTable becomes clean.
 */
void vmw_resource_evict_all(struct vmw_private *dev_priv)
{
	enum vmw_res_type type;

	mutex_lock(&dev_priv->cmdbuf_mutex);

	for (type = 0; type < vmw_res_max; ++type)
		vmw_resource_evict_type(dev_priv, type);

	mutex_unlock(&dev_priv->cmdbuf_mutex);
}