Training courses

Kernel and Embedded Linux

Bootlin training courses

Embedded Linux, kernel,
Yocto Project, Buildroot, real-time,
graphics, boot time, debugging...

Bootlin logo

Elixir Cross Referencer

   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
/*	$NetBSD: vmwgfx_shader.c,v 1.3 2021/12/18 23:45:45 riastradh Exp $	*/

// SPDX-License-Identifier: GPL-2.0 OR MIT
/**************************************************************************
 *
 * Copyright 2009-2015 VMware, Inc., Palo Alto, CA., USA
 *
 * 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 <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: vmwgfx_shader.c,v 1.3 2021/12/18 23:45:45 riastradh Exp $");

#include <drm/ttm/ttm_placement.h>

#include "vmwgfx_drv.h"
#include "vmwgfx_resource_priv.h"
#include "vmwgfx_binding.h"

struct vmw_shader {
	struct vmw_resource res;
	SVGA3dShaderType type;
	uint32_t size;
	uint8_t num_input_sig;
	uint8_t num_output_sig;
};

struct vmw_user_shader {
	struct ttm_base_object base;
	struct vmw_shader shader;
};

struct vmw_dx_shader {
	struct vmw_resource res;
	struct vmw_resource *ctx;
	struct vmw_resource *cotable;
	u32 id;
	bool committed;
	struct list_head cotable_head;
};

static uint64_t vmw_user_shader_size;
static uint64_t vmw_shader_size;
static size_t vmw_shader_dx_size;

static void vmw_user_shader_free(struct vmw_resource *res);
static struct vmw_resource *
vmw_user_shader_base_to_res(struct ttm_base_object *base);

static int vmw_gb_shader_create(struct vmw_resource *res);
static int vmw_gb_shader_bind(struct vmw_resource *res,
			       struct ttm_validate_buffer *val_buf);
static int vmw_gb_shader_unbind(struct vmw_resource *res,
				 bool readback,
				 struct ttm_validate_buffer *val_buf);
static int vmw_gb_shader_destroy(struct vmw_resource *res);

static int vmw_dx_shader_create(struct vmw_resource *res);
static int vmw_dx_shader_bind(struct vmw_resource *res,
			       struct ttm_validate_buffer *val_buf);
static int vmw_dx_shader_unbind(struct vmw_resource *res,
				 bool readback,
				 struct ttm_validate_buffer *val_buf);
static void vmw_dx_shader_commit_notify(struct vmw_resource *res,
					enum vmw_cmdbuf_res_state state);
static bool vmw_shader_id_ok(u32 user_key, SVGA3dShaderType shader_type);
static u32 vmw_shader_key(u32 user_key, SVGA3dShaderType shader_type);
static uint64_t vmw_user_shader_size;

static const struct vmw_user_resource_conv user_shader_conv = {
	.object_type = VMW_RES_SHADER,
	.base_obj_to_res = vmw_user_shader_base_to_res,
	.res_free = vmw_user_shader_free
};

const struct vmw_user_resource_conv *user_shader_converter =
	&user_shader_conv;


static const struct vmw_res_func vmw_gb_shader_func = {
	.res_type = vmw_res_shader,
	.needs_backup = true,
	.may_evict = true,
	.prio = 3,
	.dirty_prio = 3,
	.type_name = "guest backed shaders",
	.backup_placement = &vmw_mob_placement,
	.create = vmw_gb_shader_create,
	.destroy = vmw_gb_shader_destroy,
	.bind = vmw_gb_shader_bind,
	.unbind = vmw_gb_shader_unbind
};

static const struct vmw_res_func vmw_dx_shader_func = {
	.res_type = vmw_res_shader,
	.needs_backup = true,
	.may_evict = true,
	.prio = 3,
	.dirty_prio = 3,
	.type_name = "dx shaders",
	.backup_placement = &vmw_mob_placement,
	.create = vmw_dx_shader_create,
	/*
	 * The destroy callback is only called with a committed resource on
	 * context destroy, in which case we destroy the cotable anyway,
	 * so there's no need to destroy DX shaders separately.
	 */
	.destroy = NULL,
	.bind = vmw_dx_shader_bind,
	.unbind = vmw_dx_shader_unbind,
	.commit_notify = vmw_dx_shader_commit_notify,
};

/**
 * Shader management:
 */

static inline struct vmw_shader *
vmw_res_to_shader(struct vmw_resource *res)
{
	return container_of(res, struct vmw_shader, res);
}

/**
 * vmw_res_to_dx_shader - typecast a struct vmw_resource to a
 * struct vmw_dx_shader
 *
 * @res: Pointer to the struct vmw_resource.
 */
static inline struct vmw_dx_shader *
vmw_res_to_dx_shader(struct vmw_resource *res)
{
	return container_of(res, struct vmw_dx_shader, res);
}

static void vmw_hw_shader_destroy(struct vmw_resource *res)
{
	if (likely(res->func->destroy))
		(void) res->func->destroy(res);
	else
		res->id = -1;
}


static int vmw_gb_shader_init(struct vmw_private *dev_priv,
			      struct vmw_resource *res,
			      uint32_t size,
			      uint64_t offset,
			      SVGA3dShaderType type,
			      uint8_t num_input_sig,
			      uint8_t num_output_sig,
			      struct vmw_buffer_object *byte_code,
			      void (*res_free) (struct vmw_resource *res))
{
	struct vmw_shader *shader = vmw_res_to_shader(res);
	int ret;

	ret = vmw_resource_init(dev_priv, res, true, res_free,
				&vmw_gb_shader_func);

	if (unlikely(ret != 0)) {
		if (res_free)
			res_free(res);
		else
			kfree(res);
		return ret;
	}

	res->backup_size = size;
	if (byte_code) {
		res->backup = vmw_bo_reference(byte_code);
		res->backup_offset = offset;
	}
	shader->size = size;
	shader->type = type;
	shader->num_input_sig = num_input_sig;
	shader->num_output_sig = num_output_sig;

	res->hw_destroy = vmw_hw_shader_destroy;
	return 0;
}

/*
 * GB shader code:
 */

static int vmw_gb_shader_create(struct vmw_resource *res)
{
	struct vmw_private *dev_priv = res->dev_priv;
	struct vmw_shader *shader = vmw_res_to_shader(res);
	int ret;
	struct {
		SVGA3dCmdHeader header;
		SVGA3dCmdDefineGBShader body;
	} *cmd;

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

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

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

	cmd = VMW_FIFO_RESERVE(dev_priv, sizeof(*cmd));
	if (unlikely(cmd == NULL)) {
		ret = -ENOMEM;
		goto out_no_fifo;
	}

	cmd->header.id = SVGA_3D_CMD_DEFINE_GB_SHADER;
	cmd->header.size = sizeof(cmd->body);
	cmd->body.shid = res->id;
	cmd->body.type = shader->type;
	cmd->body.sizeInBytes = shader->size;
	vmw_fifo_commit(dev_priv, sizeof(*cmd));
	vmw_fifo_resource_inc(dev_priv);

	return 0;

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

static int vmw_gb_shader_bind(struct vmw_resource *res,
			      struct ttm_validate_buffer *val_buf)
{
	struct vmw_private *dev_priv = res->dev_priv;
	struct {
		SVGA3dCmdHeader header;
		SVGA3dCmdBindGBShader body;
	} *cmd;
	struct ttm_buffer_object *bo = val_buf->bo;

	BUG_ON(bo->mem.mem_type != VMW_PL_MOB);

	cmd = VMW_FIFO_RESERVE(dev_priv, sizeof(*cmd));
	if (unlikely(cmd == NULL))
		return -ENOMEM;

	cmd->header.id = SVGA_3D_CMD_BIND_GB_SHADER;
	cmd->header.size = sizeof(cmd->body);
	cmd->body.shid = res->id;
	cmd->body.mobid = bo->mem.start;
	cmd->body.offsetInBytes = res->backup_offset;
	res->backup_dirty = false;
	vmw_fifo_commit(dev_priv, sizeof(*cmd));

	return 0;
}

static int vmw_gb_shader_unbind(struct vmw_resource *res,
				bool readback,
				struct ttm_validate_buffer *val_buf)
{
	struct vmw_private *dev_priv = res->dev_priv;
	struct {
		SVGA3dCmdHeader header;
		SVGA3dCmdBindGBShader body;
	} *cmd;
	struct vmw_fence_obj *fence;

	BUG_ON(res->backup->base.mem.mem_type != VMW_PL_MOB);

	cmd = VMW_FIFO_RESERVE(dev_priv, sizeof(*cmd));
	if (unlikely(cmd == NULL))
		return -ENOMEM;

	cmd->header.id = SVGA_3D_CMD_BIND_GB_SHADER;
	cmd->header.size = sizeof(cmd->body);
	cmd->body.shid = res->id;
	cmd->body.mobid = SVGA3D_INVALID_ID;
	cmd->body.offsetInBytes = 0;
	vmw_fifo_commit(dev_priv, sizeof(*cmd));

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

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

	vmw_bo_fence_single(val_buf->bo, fence);

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

	return 0;
}

static int vmw_gb_shader_destroy(struct vmw_resource *res)
{
	struct vmw_private *dev_priv = res->dev_priv;
	struct {
		SVGA3dCmdHeader header;
		SVGA3dCmdDestroyGBShader body;
	} *cmd;

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

	mutex_lock(&dev_priv->binding_mutex);
	vmw_binding_res_list_scrub(&res->binding_head);

	cmd = VMW_FIFO_RESERVE(dev_priv, sizeof(*cmd));
	if (unlikely(cmd == NULL)) {
		mutex_unlock(&dev_priv->binding_mutex);
		return -ENOMEM;
	}

	cmd->header.id = SVGA_3D_CMD_DESTROY_GB_SHADER;
	cmd->header.size = sizeof(cmd->body);
	cmd->body.shid = res->id;
	vmw_fifo_commit(dev_priv, sizeof(*cmd));
	mutex_unlock(&dev_priv->binding_mutex);
	vmw_resource_release_id(res);
	vmw_fifo_resource_dec(dev_priv);

	return 0;
}

/*
 * DX shader code:
 */

/**
 * vmw_dx_shader_commit_notify - Notify that a shader operation has been
 * committed to hardware from a user-supplied command stream.
 *
 * @res: Pointer to the shader resource.
 * @state: Indicating whether a creation or removal has been committed.
 *
 */
static void vmw_dx_shader_commit_notify(struct vmw_resource *res,
					enum vmw_cmdbuf_res_state state)
{
	struct vmw_dx_shader *shader = vmw_res_to_dx_shader(res);
	struct vmw_private *dev_priv = res->dev_priv;

	if (state == VMW_CMDBUF_RES_ADD) {
		mutex_lock(&dev_priv->binding_mutex);
		vmw_cotable_add_resource(shader->cotable,
					 &shader->cotable_head);
		shader->committed = true;
		res->id = shader->id;
		mutex_unlock(&dev_priv->binding_mutex);
	} else {
		mutex_lock(&dev_priv->binding_mutex);
		list_del_init(&shader->cotable_head);
		shader->committed = false;
		res->id = -1;
		mutex_unlock(&dev_priv->binding_mutex);
	}
}

/**
 * vmw_dx_shader_unscrub - Have the device reattach a MOB to a DX shader.
 *
 * @res: The shader resource
 *
 * This function reverts a scrub operation.
 */
static int vmw_dx_shader_unscrub(struct vmw_resource *res)
{
	struct vmw_dx_shader *shader = vmw_res_to_dx_shader(res);
	struct vmw_private *dev_priv = res->dev_priv;
	struct {
		SVGA3dCmdHeader header;
		SVGA3dCmdDXBindShader body;
	} *cmd;

	if (!list_empty(&shader->cotable_head) || !shader->committed)
		return 0;

	cmd = VMW_FIFO_RESERVE_DX(dev_priv, sizeof(*cmd), shader->ctx->id);
	if (unlikely(cmd == NULL))
		return -ENOMEM;

	cmd->header.id = SVGA_3D_CMD_DX_BIND_SHADER;
	cmd->header.size = sizeof(cmd->body);
	cmd->body.cid = shader->ctx->id;
	cmd->body.shid = shader->id;
	cmd->body.mobid = res->backup->base.mem.start;
	cmd->body.offsetInBytes = res->backup_offset;
	vmw_fifo_commit(dev_priv, sizeof(*cmd));

	vmw_cotable_add_resource(shader->cotable, &shader->cotable_head);

	return 0;
}

/**
 * vmw_dx_shader_create - The DX shader create callback
 *
 * @res: The DX shader resource
 *
 * The create callback is called as part of resource validation and
 * makes sure that we unscrub the shader if it's previously been scrubbed.
 */
static int vmw_dx_shader_create(struct vmw_resource *res)
{
	struct vmw_private *dev_priv = res->dev_priv;
	struct vmw_dx_shader *shader = vmw_res_to_dx_shader(res);
	int ret = 0;

	WARN_ON_ONCE(!shader->committed);

	if (vmw_resource_mob_attached(res)) {
		mutex_lock(&dev_priv->binding_mutex);
		ret = vmw_dx_shader_unscrub(res);
		mutex_unlock(&dev_priv->binding_mutex);
	}

	res->id = shader->id;
	return ret;
}

/**
 * vmw_dx_shader_bind - The DX shader bind callback
 *
 * @res: The DX shader resource
 * @val_buf: Pointer to the validate buffer.
 *
 */
static int vmw_dx_shader_bind(struct vmw_resource *res,
			      struct ttm_validate_buffer *val_buf)
{
	struct vmw_private *dev_priv = res->dev_priv;
	struct ttm_buffer_object *bo = val_buf->bo;

	BUG_ON(bo->mem.mem_type != VMW_PL_MOB);
	mutex_lock(&dev_priv->binding_mutex);
	vmw_dx_shader_unscrub(res);
	mutex_unlock(&dev_priv->binding_mutex);

	return 0;
}

/**
 * vmw_dx_shader_scrub - Have the device unbind a MOB from a DX shader.
 *
 * @res: The shader resource
 *
 * This function unbinds a MOB from the DX shader without requiring the
 * MOB dma_buffer to be reserved. The driver still considers the MOB bound.
 * However, once the driver eventually decides to unbind the MOB, it doesn't
 * need to access the context.
 */
static int vmw_dx_shader_scrub(struct vmw_resource *res)
{
	struct vmw_dx_shader *shader = vmw_res_to_dx_shader(res);
	struct vmw_private *dev_priv = res->dev_priv;
	struct {
		SVGA3dCmdHeader header;
		SVGA3dCmdDXBindShader body;
	} *cmd;

	if (list_empty(&shader->cotable_head))
		return 0;

	WARN_ON_ONCE(!shader->committed);
	cmd = VMW_FIFO_RESERVE(dev_priv, sizeof(*cmd));
	if (unlikely(cmd == NULL))
		return -ENOMEM;

	cmd->header.id = SVGA_3D_CMD_DX_BIND_SHADER;
	cmd->header.size = sizeof(cmd->body);
	cmd->body.cid = shader->ctx->id;
	cmd->body.shid = res->id;
	cmd->body.mobid = SVGA3D_INVALID_ID;
	cmd->body.offsetInBytes = 0;
	vmw_fifo_commit(dev_priv, sizeof(*cmd));
	res->id = -1;
	list_del_init(&shader->cotable_head);

	return 0;
}

/**
 * vmw_dx_shader_unbind - The dx shader unbind callback.
 *
 * @res: The shader resource
 * @readback: Whether this is a readback unbind. Currently unused.
 * @val_buf: MOB buffer information.
 */
static int vmw_dx_shader_unbind(struct vmw_resource *res,
				bool readback,
				struct ttm_validate_buffer *val_buf)
{
	struct vmw_private *dev_priv = res->dev_priv;
	struct vmw_fence_obj *fence;
	int ret;

	BUG_ON(res->backup->base.mem.mem_type != VMW_PL_MOB);

	mutex_lock(&dev_priv->binding_mutex);
	ret = vmw_dx_shader_scrub(res);
	mutex_unlock(&dev_priv->binding_mutex);

	if (ret)
		return ret;

	(void) vmw_execbuf_fence_commands(NULL, dev_priv,
					  &fence, NULL);
	vmw_bo_fence_single(val_buf->bo, fence);

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

	return 0;
}

/**
 * vmw_dx_shader_cotable_list_scrub - The cotable unbind_func callback for
 * DX shaders.
 *
 * @dev_priv: Pointer to device private structure.
 * @list: The list of cotable resources.
 * @readback: Whether the call was part of a readback unbind.
 *
 * Scrubs all shader MOBs so that any subsequent shader unbind or shader
 * destroy operation won't need to swap in the context.
 */
void vmw_dx_shader_cotable_list_scrub(struct vmw_private *dev_priv,
				      struct list_head *list,
				      bool readback)
{
	struct vmw_dx_shader *entry, *next;

	lockdep_assert_held_once(&dev_priv->binding_mutex);

	list_for_each_entry_safe(entry, next, list, cotable_head) {
		WARN_ON(vmw_dx_shader_scrub(&entry->res));
		if (!readback)
			entry->committed = false;
	}
}

/**
 * vmw_dx_shader_res_free - The DX shader free callback
 *
 * @res: The shader resource
 *
 * Frees the DX shader resource and updates memory accounting.
 */
static void vmw_dx_shader_res_free(struct vmw_resource *res)
{
	struct vmw_private *dev_priv = res->dev_priv;
	struct vmw_dx_shader *shader = vmw_res_to_dx_shader(res);

	vmw_resource_unreference(&shader->cotable);
	kfree(shader);
	ttm_mem_global_free(vmw_mem_glob(dev_priv), vmw_shader_dx_size);
}

/**
 * vmw_dx_shader_add - Add a shader resource as a command buffer managed
 * resource.
 *
 * @man: The command buffer resource manager.
 * @ctx: Pointer to the context resource.
 * @user_key: The id used for this shader.
 * @shader_type: The shader type.
 * @list: The list of staged command buffer managed resources.
 */
int vmw_dx_shader_add(struct vmw_cmdbuf_res_manager *man,
		      struct vmw_resource *ctx,
		      u32 user_key,
		      SVGA3dShaderType shader_type,
		      struct list_head *list)
{
	struct vmw_dx_shader *shader;
	struct vmw_resource *res;
	struct vmw_private *dev_priv = ctx->dev_priv;
	struct ttm_operation_ctx ttm_opt_ctx = {
		.interruptible = true,
		.no_wait_gpu = false
	};
	int ret;

	if (!vmw_shader_dx_size)
		vmw_shader_dx_size = ttm_round_pot(sizeof(*shader));

	if (!vmw_shader_id_ok(user_key, shader_type))
		return -EINVAL;

	ret = ttm_mem_global_alloc(vmw_mem_glob(dev_priv), vmw_shader_dx_size,
				   &ttm_opt_ctx);
	if (ret) {
		if (ret != -ERESTARTSYS)
			DRM_ERROR("Out of graphics memory for shader "
				  "creation.\n");
		return ret;
	}

	shader = kmalloc(sizeof(*shader), GFP_KERNEL);
	if (!shader) {
		ttm_mem_global_free(vmw_mem_glob(dev_priv), vmw_shader_dx_size);
		return -ENOMEM;
	}

	res = &shader->res;
	shader->ctx = ctx;
	shader->cotable = vmw_resource_reference
		(vmw_context_cotable(ctx, SVGA_COTABLE_DXSHADER));
	shader->id = user_key;
	shader->committed = false;
	INIT_LIST_HEAD(&shader->cotable_head);
	ret = vmw_resource_init(dev_priv, res, true,
				vmw_dx_shader_res_free, &vmw_dx_shader_func);
	if (ret)
		goto out_resource_init;

	/*
	 * The user_key name-space is not per shader type for DX shaders,
	 * so when hashing, use a single zero shader type.
	 */
	ret = vmw_cmdbuf_res_add(man, vmw_cmdbuf_res_shader,
				 vmw_shader_key(user_key, 0),
				 res, list);
	if (ret)
		goto out_resource_init;

	res->id = shader->id;
	res->hw_destroy = vmw_hw_shader_destroy;

out_resource_init:
	vmw_resource_unreference(&res);

	return ret;
}



/**
 * User-space shader management:
 */

static struct vmw_resource *
vmw_user_shader_base_to_res(struct ttm_base_object *base)
{
	return &(container_of(base, struct vmw_user_shader, base)->
		 shader.res);
}

static void vmw_user_shader_free(struct vmw_resource *res)
{
	struct vmw_user_shader *ushader =
		container_of(res, struct vmw_user_shader, shader.res);
	struct vmw_private *dev_priv = res->dev_priv;

	ttm_base_object_kfree(ushader, base);
	ttm_mem_global_free(vmw_mem_glob(dev_priv),
			    vmw_user_shader_size);
}

static void vmw_shader_free(struct vmw_resource *res)
{
	struct vmw_shader *shader = vmw_res_to_shader(res);
	struct vmw_private *dev_priv = res->dev_priv;

	kfree(shader);
	ttm_mem_global_free(vmw_mem_glob(dev_priv),
			    vmw_shader_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_shader_base_release(struct ttm_base_object **p_base)
{
	struct ttm_base_object *base = *p_base;
	struct vmw_resource *res = vmw_user_shader_base_to_res(base);

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

int vmw_shader_destroy_ioctl(struct drm_device *dev, void *data,
			      struct drm_file *file_priv)
{
	struct drm_vmw_shader_arg *arg = (struct drm_vmw_shader_arg *)data;
	struct ttm_object_file *tfile = vmw_fpriv(file_priv)->tfile;

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

static int vmw_user_shader_alloc(struct vmw_private *dev_priv,
				 struct vmw_buffer_object *buffer,
				 size_t shader_size,
				 size_t offset,
				 SVGA3dShaderType shader_type,
				 uint8_t num_input_sig,
				 uint8_t num_output_sig,
				 struct ttm_object_file *tfile,
				 u32 *handle)
{
	struct vmw_user_shader *ushader;
	struct vmw_resource *res, *tmp;
	struct ttm_operation_ctx ctx = {
		.interruptible = true,
		.no_wait_gpu = false
	};
	int ret;

	if (unlikely(vmw_user_shader_size == 0))
		vmw_user_shader_size =
			ttm_round_pot(sizeof(struct vmw_user_shader)) +
			VMW_IDA_ACC_SIZE + TTM_OBJ_EXTRA_SIZE;

	ret = ttm_mem_global_alloc(vmw_mem_glob(dev_priv),
				   vmw_user_shader_size,
				   &ctx);
	if (unlikely(ret != 0)) {
		if (ret != -ERESTARTSYS)
			DRM_ERROR("Out of graphics memory for shader "
				  "creation.\n");
		goto out;
	}

	ushader = kzalloc(sizeof(*ushader), GFP_KERNEL);
	if (unlikely(!ushader)) {
		ttm_mem_global_free(vmw_mem_glob(dev_priv),
				    vmw_user_shader_size);
		ret = -ENOMEM;
		goto out;
	}

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

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

	ret = vmw_gb_shader_init(dev_priv, res, shader_size,
				 offset, shader_type, num_input_sig,
				 num_output_sig, buffer,
				 vmw_user_shader_free);
	if (unlikely(ret != 0))
		goto out;

	tmp = vmw_resource_reference(res);
	ret = ttm_base_object_init(tfile, &ushader->base, false,
				   VMW_RES_SHADER,
				   &vmw_user_shader_base_release, NULL);

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

	if (handle)
		*handle = ushader->base.handle;
out_err:
	vmw_resource_unreference(&res);
out:
	return ret;
}


static struct vmw_resource *vmw_shader_alloc(struct vmw_private *dev_priv,
					     struct vmw_buffer_object *buffer,
					     size_t shader_size,
					     size_t offset,
					     SVGA3dShaderType shader_type)
{
	struct vmw_shader *shader;
	struct vmw_resource *res;
	struct ttm_operation_ctx ctx = {
		.interruptible = true,
		.no_wait_gpu = false
	};
	int ret;

	if (unlikely(vmw_shader_size == 0))
		vmw_shader_size =
			ttm_round_pot(sizeof(struct vmw_shader)) +
			VMW_IDA_ACC_SIZE;

	ret = ttm_mem_global_alloc(vmw_mem_glob(dev_priv),
				   vmw_shader_size,
				   &ctx);
	if (unlikely(ret != 0)) {
		if (ret != -ERESTARTSYS)
			DRM_ERROR("Out of graphics memory for shader "
				  "creation.\n");
		goto out_err;
	}

	shader = kzalloc(sizeof(*shader), GFP_KERNEL);
	if (unlikely(!shader)) {
		ttm_mem_global_free(vmw_mem_glob(dev_priv),
				    vmw_shader_size);
		ret = -ENOMEM;
		goto out_err;
	}

	res = &shader->res;

	/*
	 * From here on, the destructor takes over resource freeing.
	 */
	ret = vmw_gb_shader_init(dev_priv, res, shader_size,
				 offset, shader_type, 0, 0, buffer,
				 vmw_shader_free);

out_err:
	return ret ? ERR_PTR(ret) : res;
}


static int vmw_shader_define(struct drm_device *dev, struct drm_file *file_priv,
			     enum drm_vmw_shader_type shader_type_drm,
			     u32 buffer_handle, size_t size, size_t offset,
			     uint8_t num_input_sig, uint8_t num_output_sig,
			     uint32_t *shader_handle)
{
	struct vmw_private *dev_priv = vmw_priv(dev);
	struct ttm_object_file *tfile = vmw_fpriv(file_priv)->tfile;
	struct vmw_buffer_object *buffer = NULL;
	SVGA3dShaderType shader_type;
	int ret;

	if (buffer_handle != SVGA3D_INVALID_ID) {
		ret = vmw_user_bo_lookup(tfile, buffer_handle,
					     &buffer, NULL);
		if (unlikely(ret != 0)) {
			VMW_DEBUG_USER("Couldn't find buffer for shader creation.\n");
			return ret;
		}

		if ((u64)buffer->base.num_pages * PAGE_SIZE <
		    (u64)size + (u64)offset) {
			VMW_DEBUG_USER("Illegal buffer- or shader size.\n");
			ret = -EINVAL;
			goto out_bad_arg;
		}
	}

	switch (shader_type_drm) {
	case drm_vmw_shader_type_vs:
		shader_type = SVGA3D_SHADERTYPE_VS;
		break;
	case drm_vmw_shader_type_ps:
		shader_type = SVGA3D_SHADERTYPE_PS;
		break;
	default:
		VMW_DEBUG_USER("Illegal shader type.\n");
		ret = -EINVAL;
		goto out_bad_arg;
	}

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

	ret = vmw_user_shader_alloc(dev_priv, buffer, size, offset,
				    shader_type, num_input_sig,
				    num_output_sig, tfile, shader_handle);

	ttm_read_unlock(&dev_priv->reservation_sem);
out_bad_arg:
	vmw_bo_unreference(&buffer);
	return ret;
}

/**
 * vmw_shader_id_ok - Check whether a compat shader user key and
 * shader type are within valid bounds.
 *
 * @user_key: User space id of the shader.
 * @shader_type: Shader type.
 *
 * Returns true if valid false if not.
 */
static bool vmw_shader_id_ok(u32 user_key, SVGA3dShaderType shader_type)
{
	return user_key <= ((1 << 20) - 1) && (unsigned) shader_type < 16;
}

/**
 * vmw_shader_key - Compute a hash key suitable for a compat shader.
 *
 * @user_key: User space id of the shader.
 * @shader_type: Shader type.
 *
 * Returns a hash key suitable for a command buffer managed resource
 * manager hash table.
 */
static u32 vmw_shader_key(u32 user_key, SVGA3dShaderType shader_type)
{
	return user_key | (shader_type << 20);
}

/**
 * vmw_shader_remove - Stage a compat shader for removal.
 *
 * @man: Pointer to the compat shader manager identifying the shader namespace.
 * @user_key: The key that is used to identify the shader. The key is
 * unique to the shader type.
 * @shader_type: Shader type.
 * @list: Caller's list of staged command buffer resource actions.
 */
int vmw_shader_remove(struct vmw_cmdbuf_res_manager *man,
		      u32 user_key, SVGA3dShaderType shader_type,
		      struct list_head *list)
{
	struct vmw_resource *dummy;

	if (!vmw_shader_id_ok(user_key, shader_type))
		return -EINVAL;

	return vmw_cmdbuf_res_remove(man, vmw_cmdbuf_res_shader,
				     vmw_shader_key(user_key, shader_type),
				     list, &dummy);
}

/**
 * vmw_compat_shader_add - Create a compat shader and stage it for addition
 * as a command buffer managed resource.
 *
 * @man: Pointer to the compat shader manager identifying the shader namespace.
 * @user_key: The key that is used to identify the shader. The key is
 * unique to the shader type.
 * @bytecode: Pointer to the bytecode of the shader.
 * @shader_type: Shader type.
 * @tfile: Pointer to a struct ttm_object_file that the guest-backed shader is
 * to be created with.
 * @list: Caller's list of staged command buffer resource actions.
 *
 */
int vmw_compat_shader_add(struct vmw_private *dev_priv,
			  struct vmw_cmdbuf_res_manager *man,
			  u32 user_key, const void *bytecode,
			  SVGA3dShaderType shader_type,
			  size_t size,
			  struct list_head *list)
{
	struct ttm_operation_ctx ctx = { false, true };
	struct vmw_buffer_object *buf;
	struct ttm_bo_kmap_obj map;
	bool is_iomem;
	int ret;
	struct vmw_resource *res;

	if (!vmw_shader_id_ok(user_key, shader_type))
		return -EINVAL;

	/* Allocate and pin a DMA buffer */
	buf = kzalloc(sizeof(*buf), GFP_KERNEL);
	if (unlikely(!buf))
		return -ENOMEM;

	ret = vmw_bo_init(dev_priv, buf, size, &vmw_sys_ne_placement,
			      true, vmw_bo_bo_free);
	if (unlikely(ret != 0))
		goto out;

	ret = ttm_bo_reserve(&buf->base, false, true, NULL);
	if (unlikely(ret != 0))
		goto no_reserve;

	/* Map and copy shader bytecode. */
	ret = ttm_bo_kmap(&buf->base, 0, PAGE_ALIGN(size) >> PAGE_SHIFT,
			  &map);
	if (unlikely(ret != 0)) {
		ttm_bo_unreserve(&buf->base);
		goto no_reserve;
	}

	memcpy(ttm_kmap_obj_virtual(&map, &is_iomem), bytecode, size);
	WARN_ON(is_iomem);

	ttm_bo_kunmap(&map);
	ret = ttm_bo_validate(&buf->base, &vmw_sys_placement, &ctx);
	WARN_ON(ret != 0);
	ttm_bo_unreserve(&buf->base);

	res = vmw_shader_alloc(dev_priv, buf, size, 0, shader_type);
	if (unlikely(ret != 0))
		goto no_reserve;

	ret = vmw_cmdbuf_res_add(man, vmw_cmdbuf_res_shader,
				 vmw_shader_key(user_key, shader_type),
				 res, list);
	vmw_resource_unreference(&res);
no_reserve:
	vmw_bo_unreference(&buf);
out:
	return ret;
}

/**
 * vmw_shader_lookup - Look up a compat shader
 *
 * @man: Pointer to the command buffer managed resource manager identifying
 * the shader namespace.
 * @user_key: The user space id of the shader.
 * @shader_type: The shader type.
 *
 * Returns a refcounted pointer to a struct vmw_resource if the shader was
 * found. An error pointer otherwise.
 */
struct vmw_resource *
vmw_shader_lookup(struct vmw_cmdbuf_res_manager *man,
		  u32 user_key,
		  SVGA3dShaderType shader_type)
{
	if (!vmw_shader_id_ok(user_key, shader_type))
		return ERR_PTR(-EINVAL);

	return vmw_cmdbuf_res_lookup(man, vmw_cmdbuf_res_shader,
				     vmw_shader_key(user_key, shader_type));
}

int vmw_shader_define_ioctl(struct drm_device *dev, void *data,
			     struct drm_file *file_priv)
{
	struct drm_vmw_shader_create_arg *arg =
		(struct drm_vmw_shader_create_arg *)data;

	return vmw_shader_define(dev, file_priv, arg->shader_type,
				 arg->buffer_handle,
				 arg->size, arg->offset,
				 0, 0,
				 &arg->shader_handle);
}