summaryrefslogtreecommitdiffstats
path: root/drivers/gpu/drm/vmwgfx/vmwgfx_context.c
blob: 82c41daebc0e35be6fb3629b602a083a6520f6a3 (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
/**************************************************************************
 *
 * Copyright © 2009-2012 VMware, Inc., Palo Alto, CA., USA
 * All Rights Reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sub license, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice (including the
 * next paragraph) shall be included in all copies or substantial portions
 * of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
 * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
 * USE OR OTHER DEALINGS IN THE SOFTWARE.
 *
 **************************************************************************/

#include "vmwgfx_drv.h"
#include "vmwgfx_resource_priv.h"
#include "ttm/ttm_placement.h"

struct vmw_user_context {
	struct ttm_base_object base;
	struct vmw_resource res;
	struct vmw_ctx_binding_state cbs;
};



typedef int (*vmw_scrub_func)(struct vmw_ctx_bindinfo *);

static void vmw_user_context_free(struct vmw_resource *res);
static struct vmw_resource *
vmw_user_context_base_to_res(struct ttm_base_object *base);

static int vmw_gb_context_create(struct vmw_resource *res);
static int vmw_gb_context_bind(struct vmw_resource *res,
			       struct ttm_validate_buffer *val_buf);
static int vmw_gb_context_unbind(struct vmw_resource *res,
				 bool readback,
				 struct ttm_validate_buffer *val_buf);
static int vmw_gb_context_destroy(struct vmw_resource *res);
static int vmw_context_scrub_shader(struct vmw_ctx_bindinfo *bi);
static int vmw_context_scrub_render_target(struct vmw_ctx_bindinfo *bi);
static int vmw_context_scrub_texture(struct vmw_ctx_bindinfo *bi);
static void vmw_context_binding_state_kill(struct vmw_ctx_binding_state *cbs);
static uint64_t vmw_user_context_size;

static const struct vmw_user_resource_conv user_context_conv = {
	.object_type = VMW_RES_CONTEXT,
	.base_obj_to_res = vmw_user_context_base_to_res,
	.res_free = vmw_user_context_free
};

const struct vmw_user_resource_conv *user_context_converter =
	&user_context_conv;


static const struct vmw_res_func vmw_legacy_context_func = {
	.res_type = vmw_res_context,
	.needs_backup = false,
	.may_evict = false,
	.type_name = "legacy contexts",
	.backup_placement = NULL,
	.create = NULL,
	.destroy = NULL,
	.bind = NULL,
	.unbind = NULL
};

static const struct vmw_res_func vmw_gb_context_func = {
	.res_type = vmw_res_context,
	.needs_backup = true,
	.may_evict = true,
	.type_name = "guest backed contexts",
	.backup_placement = &vmw_mob_placement,
	.create = vmw_gb_context_create,
	.destroy = vmw_gb_context_destroy,
	.bind = vmw_gb_context_bind,
	.unbind = vmw_gb_context_unbind
};

static const vmw_scrub_func vmw_scrub_funcs[vmw_ctx_binding_max] = {
	[vmw_ctx_binding_shader] = vmw_context_scrub_shader,
	[vmw_ctx_binding_rt] = vmw_context_scrub_render_target,
	[vmw_ctx_binding_tex] = vmw_context_scrub_texture };

/**
 * Context management:
 */

static void vmw_hw_context_destroy(struct vmw_resource *res)
{

	struct vmw_private *dev_priv = res->dev_priv;
	struct {
		SVGA3dCmdHeader header;
		SVGA3dCmdDestroyContext body;
	} *cmd;


	if (res->func->destroy == vmw_gb_context_destroy) {
		mutex_lock(&dev_priv->cmdbuf_mutex);
		(void) vmw_gb_context_destroy(res);
		if (dev_priv->pinned_bo != NULL &&
		    !dev_priv->query_cid_valid)
			__vmw_execbuf_release_pinned_bo(dev_priv, NULL);
		mutex_unlock(&dev_priv->cmdbuf_mutex);
		return;
	}

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

	cmd->header.id = cpu_to_le32(SVGA_3D_CMD_CONTEXT_DESTROY);
	cmd->header.size = cpu_to_le32(sizeof(cmd->body));
	cmd->body.cid = cpu_to_le32(res->id);

	vmw_fifo_commit(dev_priv, sizeof(*cmd));
	vmw_3d_resource_dec(dev_priv, false);
}

static int vmw_gb_context_init(struct vmw_private *dev_priv,
			       struct vmw_resource *res,
			       void (*res_free) (struct vmw_resource *res))
{
	int ret;
	struct vmw_user_context *uctx =
		container_of(res, struct vmw_user_context, res);

	ret = vmw_resource_init(dev_priv, res, true,
				res_free, &vmw_gb_context_func);
	res->backup_size = SVGA3D_CONTEXT_DATA_SIZE;

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

	memset(&uctx->cbs, 0, sizeof(uctx->cbs));
	INIT_LIST_HEAD(&uctx->cbs.list);

	vmw_resource_activate(res, vmw_hw_context_destroy);
	return 0;
}

static int vmw_context_init(struct vmw_private *dev_priv,
			    struct vmw_resource *res,
			    void (*res_free) (struct vmw_resource *res))
{
	int ret;

	struct {
		SVGA3dCmdHeader header;
		SVGA3dCmdDefineContext body;
	} *cmd;

	if (dev_priv->has_mob)
		return vmw_gb_context_init(dev_priv, res, res_free);

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

	if (unlikely(ret != 0)) {
		DRM_ERROR("Failed to allocate a resource id.\n");
		goto out_early;
	}

	if (unlikely(res->id >= SVGA3D_MAX_CONTEXT_IDS)) {
		DRM_ERROR("Out of hw context ids.\n");
		vmw_resource_unreference(&res);
		return -ENOMEM;
	}

	cmd = vmw_fifo_reserve(dev_priv, sizeof(*cmd));
	if (unlikely(cmd == NULL)) {
		DRM_ERROR("Fifo reserve failed.\n");
		vmw_resource_unreference(&res);
		return -ENOMEM;
	}

	cmd->header.id = cpu_to_le32(SVGA_3D_CMD_CONTEXT_DEFINE);
	cmd->header.size = cpu_to_le32(sizeof(cmd->body));
	cmd->body.cid = cpu_to_le32(res->id);

	vmw_fifo_commit(dev_priv, sizeof(*cmd));
	(void) vmw_3d_resource_inc(dev_priv, false);
	vmw_resource_activate(res, vmw_hw_context_destroy);
	return 0;

out_early:
	if (res_free == NULL)
		kfree(res);
	else
		res_free(res);
	return ret;
}

struct vmw_resource *vmw_context_alloc(struct vmw_private *dev_priv)
{
	struct vmw_resource *res = kmalloc(sizeof(*res), GFP_KERNEL);
	int ret;

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

	ret = vmw_context_init(dev_priv, res, NULL);

	return (ret == 0) ? res : NULL;
}


static int vmw_gb_context_create(struct vmw_resource *res)
{
	struct vmw_private *dev_priv = res->dev_priv;
	int ret;
	struct {
		SVGA3dCmdHeader header;
		SVGA3dCmdDefineGBContext 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 context id.\n");
		goto out_no_id;
	}

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

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

	cmd->header.id = SVGA_3D_CMD_DEFINE_GB_CONTEXT;
	cmd->header.size = sizeof(cmd->body);
	cmd->body.cid = res->id;
	vmw_fifo_commit(dev_priv, sizeof(*cmd));
	(void) vmw_3d_resource_inc(dev_priv, false);

	return 0;

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

static int vmw_gb_context_bind(struct vmw_resource *res,
			       struct ttm_validate_buffer *val_buf)
{
	struct vmw_private *dev_priv = res->dev_priv;
	struct {
		SVGA3dCmdHeader header;
		SVGA3dCmdBindGBContext 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)) {
		DRM_ERROR("Failed reserving FIFO space for context "
			  "binding.\n");
		return -ENOMEM;
	}

	cmd->header.id = SVGA_3D_CMD_BIND_GB_CONTEXT;
	cmd->header.size = sizeof(cmd->body);
	cmd->body.cid = res->id;
	cmd->body.mobid = bo->mem.start;
	cmd->body.validContents = res->backup_dirty;
	res->backup_dirty = false;
	vmw_fifo_commit(dev_priv, sizeof(*cmd));

	return 0;
}

static int vmw_gb_context_unbind(struct vmw_resource *res,
				 bool readback,
				 struct ttm_validate_buffer *val_buf)
{
	struct vmw_private *dev_priv = res->dev_priv;
	struct ttm_buffer_object *bo = val_buf->bo;
	struct vmw_fence_obj *fence;
	struct vmw_user_context *uctx =
		container_of(res, struct vmw_user_context, res);

	struct {
		SVGA3dCmdHeader header;
		SVGA3dCmdReadbackGBContext body;
	} *cmd1;
	struct {
		SVGA3dCmdHeader header;
		SVGA3dCmdBindGBContext body;
	} *cmd2;
	uint32_t submit_size;
	uint8_t *cmd;


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

	mutex_lock(&dev_priv->binding_mutex);
	vmw_context_binding_state_kill(&uctx->cbs);

	submit_size = sizeof(*cmd2) + (readback ? sizeof(*cmd1) : 0);

	cmd = vmw_fifo_reserve(dev_priv, submit_size);
	if (unlikely(cmd == NULL)) {
		DRM_ERROR("Failed reserving FIFO space for context "
			  "unbinding.\n");
		mutex_unlock(&dev_priv->binding_mutex);
		return -ENOMEM;
	}

	cmd2 = (void *) cmd;
	if (readback) {
		cmd1 = (void *) cmd;
		cmd1->header.id = SVGA_3D_CMD_READBACK_GB_CONTEXT;
		cmd1->header.size = sizeof(cmd1->body);
		cmd1->body.cid = res->id;
		cmd2 = (void *) (&cmd1[1]);
	}
	cmd2->header.id = SVGA_3D_CMD_BIND_GB_CONTEXT;
	cmd2->header.size = sizeof(cmd2->body);
	cmd2->body.cid = res->id;
	cmd2->body.mobid = SVGA3D_INVALID_ID;

	vmw_fifo_commit(dev_priv, submit_size);
	mutex_unlock(&dev_priv->binding_mutex);

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

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

	vmw_fence_single_bo(bo, fence);

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

	return 0;
}

static int vmw_gb_context_destroy(struct vmw_resource *res)
{
	struct vmw_private *dev_priv = res->dev_priv;
	struct {
		SVGA3dCmdHeader header;
		SVGA3dCmdDestroyGBContext body;
	} *cmd;
	struct vmw_user_context *uctx =
		container_of(res, struct vmw_user_context, res);

	BUG_ON(!list_empty(&uctx->cbs.list));

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

	cmd = vmw_fifo_reserve(dev_priv, sizeof(*cmd));
	if (unlikely(cmd == NULL)) {
		DRM_ERROR("Failed reserving FIFO space for context "
			  "destruction.\n");
		return -ENOMEM;
	}

	cmd->header.id = SVGA_3D_CMD_DESTROY_GB_CONTEXT;
	cmd->header.size = sizeof(cmd->body);
	cmd->body.cid = res->id;
	vmw_fifo_commit(dev_priv, sizeof(*cmd));
	if (dev_priv->query_cid == res->id)
		dev_priv->query_cid_valid = false;
	vmw_resource_release_id(res);
	vmw_3d_resource_dec(dev_priv, false);

	return 0;
}

/**
 * User-space context management:
 */

static struct vmw_resource *
vmw_user_context_base_to_res(struct ttm_base_object *base)
{
	return &(container_of(base, struct vmw_user_context, base)->res);
}

static void vmw_user_context_free(struct vmw_resource *res)
{
	struct vmw_user_context *ctx =
	    container_of(res, struct vmw_user_context, res);
	struct vmw_private *dev_priv = res->dev_priv;

	ttm_base_object_kfree(ctx, base);
	ttm_mem_global_free(vmw_mem_glob(dev_priv),
			    vmw_user_context_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_context_base_release(struct ttm_base_object **p_base)
{
	struct ttm_base_object *base = *p_base;
	struct vmw_user_context *ctx =
	    container_of(base, struct vmw_user_context, base);
	struct vmw_resource *res = &ctx->res;

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

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

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

int vmw_context_define_ioctl(struct drm_device *dev, void *data,
			     struct drm_file *file_priv)
{
	struct vmw_private *dev_priv = vmw_priv(dev);
	struct vmw_user_context *ctx;
	struct vmw_resource *res;
	struct vmw_resource *tmp;
	struct drm_vmw_context_arg *arg = (struct drm_vmw_context_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 contexts anyway.
	 */

	if (unlikely(vmw_user_context_size == 0))
		vmw_user_context_size = ttm_round_pot(sizeof(*ctx)) + 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_context_size,
				   false, true);
	if (unlikely(ret != 0)) {
		if (ret != -ERESTARTSYS)
			DRM_ERROR("Out of graphics memory for context"
				  " creation.\n");
		goto out_unlock;
	}

	ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
	if (unlikely(ctx == NULL)) {
		ttm_mem_global_free(vmw_mem_glob(dev_priv),
				    vmw_user_context_size);
		ret = -ENOMEM;
		goto out_unlock;
	}

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

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

	ret = vmw_context_init(dev_priv, res, vmw_user_context_free);
	if (unlikely(ret != 0))
		goto out_unlock;

	tmp = vmw_resource_reference(&ctx->res);
	ret = ttm_base_object_init(tfile, &ctx->base, false, VMW_RES_CONTEXT,
				   &vmw_user_context_base_release, NULL);

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

	arg->cid = ctx->base.hash.key;
out_err:
	vmw_resource_unreference(&res);
out_unlock:
	ttm_read_unlock(&vmaster->lock);
	return ret;

}

/**
 * vmw_context_scrub_shader - scrub a shader binding from a context.
 *
 * @bi: single binding information.
 */
static int vmw_context_scrub_shader(struct vmw_ctx_bindinfo *bi)
{
	struct vmw_private *dev_priv = bi->ctx->dev_priv;
	struct {
		SVGA3dCmdHeader header;
		SVGA3dCmdSetShader body;
	} *cmd;

	cmd = vmw_fifo_reserve(dev_priv, sizeof(*cmd));
	if (unlikely(cmd == NULL)) {
		DRM_ERROR("Failed reserving FIFO space for shader "
			  "unbinding.\n");
		return -ENOMEM;
	}

	cmd->header.id = SVGA_3D_CMD_SET_SHADER;
	cmd->header.size = sizeof(cmd->body);
	cmd->body.cid = bi->ctx->id;
	cmd->body.type = bi->i1.shader_type;
	cmd->body.shid = SVGA3D_INVALID_ID;
	vmw_fifo_commit(dev_priv, sizeof(*cmd));

	return 0;
}

/**
 * vmw_context_scrub_render_target - scrub a render target binding
 * from a context.
 *
 * @bi: single binding information.
 */
static int vmw_context_scrub_render_target(struct vmw_ctx_bindinfo *bi)
{
	struct vmw_private *dev_priv = bi->ctx->dev_priv;
	struct {
		SVGA3dCmdHeader header;
		SVGA3dCmdSetRenderTarget body;
	} *cmd;

	cmd = vmw_fifo_reserve(dev_priv, sizeof(*cmd));
	if (unlikely(cmd == NULL)) {
		DRM_ERROR("Failed reserving FIFO space for render target "
			  "unbinding.\n");
		return -ENOMEM;
	}

	cmd->header.id = SVGA_3D_CMD_SETRENDERTARGET;
	cmd->header.size = sizeof(cmd->body);
	cmd->body.cid = bi->ctx->id;
	cmd->body.type = bi->i1.rt_type;
	cmd->body.target.sid = SVGA3D_INVALID_ID;
	cmd->body.target.face = 0;
	cmd->body.target.mipmap = 0;
	vmw_fifo_commit(dev_priv, sizeof(*cmd));

	return 0;
}

/**
 * vmw_context_scrub_texture - scrub a texture binding from a context.
 *
 * @bi: single binding information.
 *
 * TODO: Possibly complement this function with a function that takes
 * a list of texture bindings and combines them to a single command.
 */
static int vmw_context_scrub_texture(struct vmw_ctx_bindinfo *bi)
{
	struct vmw_private *dev_priv = bi->ctx->dev_priv;
	struct {
		SVGA3dCmdHeader header;
		struct {
			SVGA3dCmdSetTextureState c;
			SVGA3dTextureState s1;
		} body;
	} *cmd;

	cmd = vmw_fifo_reserve(dev_priv, sizeof(*cmd));
	if (unlikely(cmd == NULL)) {
		DRM_ERROR("Failed reserving FIFO space for texture "
			  "unbinding.\n");
		return -ENOMEM;
	}


	cmd->header.id = SVGA_3D_CMD_SETTEXTURESTATE;
	cmd->header.size = sizeof(cmd->body);
	cmd->body.c.cid = bi->ctx->id;
	cmd->body.s1.stage = bi->i1.texture_stage;
	cmd->body.s1.name = SVGA3D_TS_BIND_TEXTURE;
	cmd->body.s1.value = (uint32) SVGA3D_INVALID_ID;
	vmw_fifo_commit(dev_priv, sizeof(*cmd));

	return 0;
}

/**
 * vmw_context_binding_drop: Stop tracking a context binding
 *
 * @cb: Pointer to binding tracker storage.
 *
 * Stops tracking a context binding, and re-initializes its storage.
 * Typically used when the context binding is replaced with a binding to
 * another (or the same, for that matter) resource.
 */
static void vmw_context_binding_drop(struct vmw_ctx_binding *cb)
{
	list_del(&cb->ctx_list);
	if (!list_empty(&cb->res_list))
		list_del(&cb->res_list);
	cb->bi.ctx = NULL;
}

/**
 * vmw_context_binding_add: Start tracking a context binding
 *
 * @cbs: Pointer to the context binding state tracker.
 * @bi: Information about the binding to track.
 *
 * Performs basic checks on the binding to make sure arguments are within
 * bounds and then starts tracking the binding in the context binding
 * state structure @cbs.
 */
int vmw_context_binding_add(struct vmw_ctx_binding_state *cbs,
			    const struct vmw_ctx_bindinfo *bi)
{
	struct vmw_ctx_binding *loc;

	switch (bi->bt) {
	case vmw_ctx_binding_rt:
		if (unlikely((unsigned)bi->i1.rt_type >= SVGA3D_RT_MAX)) {
			DRM_ERROR("Illegal render target type %u.\n",
				  (unsigned) bi->i1.rt_type);
			return -EINVAL;
		}
		loc = &cbs->render_targets[bi->i1.rt_type];
		break;
	case vmw_ctx_binding_tex:
		if (unlikely((unsigned)bi->i1.texture_stage >=
			     SVGA3D_NUM_TEXTURE_UNITS)) {
			DRM_ERROR("Illegal texture/sampler unit %u.\n",
				  (unsigned) bi->i1.texture_stage);
			return -EINVAL;
		}
		loc = &cbs->texture_units[bi->i1.texture_stage];
		break;
	case vmw_ctx_binding_shader:
		if (unlikely((unsigned)bi->i1.shader_type >=
			     SVGA3D_SHADERTYPE_MAX)) {
			DRM_ERROR("Illegal shader type %u.\n",
				  (unsigned) bi->i1.shader_type);
			return -EINVAL;
		}
		loc = &cbs->shaders[bi->i1.shader_type];
		break;
	default:
		BUG();
	}

	if (loc->bi.ctx != NULL)
		vmw_context_binding_drop(loc);

	loc->bi = *bi;
	list_add_tail(&loc->ctx_list, &cbs->list);
	INIT_LIST_HEAD(&loc->res_list);

	return 0;
}

/**
 * vmw_context_binding_transfer: Transfer a context binding tracking entry.
 *
 * @cbs: Pointer to the persistent context binding state tracker.
 * @bi: Information about the binding to track.
 *
 */
static void vmw_context_binding_transfer(struct vmw_ctx_binding_state *cbs,
					 const struct vmw_ctx_bindinfo *bi)
{
	struct vmw_ctx_binding *loc;

	switch (bi->bt) {
	case vmw_ctx_binding_rt:
		loc = &cbs->render_targets[bi->i1.rt_type];
		break;
	case vmw_ctx_binding_tex:
		loc = &cbs->texture_units[bi->i1.texture_stage];
		break;
	case vmw_ctx_binding_shader:
		loc = &cbs->shaders[bi->i1.shader_type];
		break;
	default:
		BUG();
	}

	if (loc->bi.ctx != NULL)
		vmw_context_binding_drop(loc);

	loc->bi = *bi;
	list_add_tail(&loc->ctx_list, &cbs->list);
	if (bi->res != NULL)
		list_add_tail(&loc->res_list, &bi->res->binding_head);
	else
		INIT_LIST_HEAD(&loc->res_list);
}

/**
 * vmw_context_binding_kill - Kill a binding on the device
 * and stop tracking it.
 *
 * @cb: Pointer to binding tracker storage.
 *
 * Emits FIFO commands to scrub a binding represented by @cb.
 * Then stops tracking the binding and re-initializes its storage.
 */
static void vmw_context_binding_kill(struct vmw_ctx_binding *cb)
{
	(void) vmw_scrub_funcs[cb->bi.bt](&cb->bi);
	vmw_context_binding_drop(cb);
}

/**
 * vmw_context_binding_state_kill - Kill all bindings associated with a
 * struct vmw_ctx_binding state structure, and re-initialize the structure.
 *
 * @cbs: Pointer to the context binding state tracker.
 *
 * Emits commands to scrub all bindings associated with the
 * context binding state tracker. Then re-initializes the whole structure.
 */
static void vmw_context_binding_state_kill(struct vmw_ctx_binding_state *cbs)
{
	struct vmw_ctx_binding *entry, *next;

	list_for_each_entry_safe(entry, next, &cbs->list, ctx_list)
		vmw_context_binding_kill(entry);
}

/**
 * vmw_context_binding_res_list_kill - Kill all bindings on a
 * resource binding list
 *
 * @head: list head of resource binding list
 *
 * Kills all bindings associated with a specific resource. Typically
 * called before the resource is destroyed.
 */
void vmw_context_binding_res_list_kill(struct list_head *head)
{
	struct vmw_ctx_binding *entry, *next;

	list_for_each_entry_safe(entry, next, head, res_list)
		vmw_context_binding_kill(entry);
}

/**
 * vmw_context_binding_state_transfer - Commit staged binding info
 *
 * @ctx: Pointer to context to commit the staged binding info to.
 * @from: Staged binding info built during execbuf.
 *
 * Transfers binding info from a temporary structure to the persistent
 * structure in the context. This can be done once commands
 */
void vmw_context_binding_state_transfer(struct vmw_resource *ctx,
					struct vmw_ctx_binding_state *from)
{
	struct vmw_user_context *uctx =
		container_of(ctx, struct vmw_user_context, res);
	struct vmw_ctx_binding *entry, *next;

	list_for_each_entry_safe(entry, next, &from->list, ctx_list)
		vmw_context_binding_transfer(&uctx->cbs, &entry->bi);
}