1 // SPDX-License-Identifier: GPL-2.0 OR MIT
2 /**************************************************************************
3  *
4  * Copyright 2009-2015 VMware, Inc., Palo Alto, CA., USA
5  *
6  * Permission is hereby granted, free of charge, to any person obtaining a
7  * copy of this software and associated documentation files (the
8  * "Software"), to deal in the Software without restriction, including
9  * without limitation the rights to use, copy, modify, merge, publish,
10  * distribute, sub license, and/or sell copies of the Software, and to
11  * permit persons to whom the Software is furnished to do so, subject to
12  * the following conditions:
13  *
14  * The above copyright notice and this permission notice (including the
15  * next paragraph) shall be included in all copies or substantial portions
16  * of the Software.
17  *
18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
19  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
20  * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
21  * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
22  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
23  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
24  * USE OR OTHER DEALINGS IN THE SOFTWARE.
25  *
26  **************************************************************************/
27 
28 #include <drm/ttm/ttm_placement.h>
29 
30 #include "vmwgfx_drv.h"
31 #include "vmwgfx_resource_priv.h"
32 #include "vmwgfx_binding.h"
33 
34 struct vmw_user_context {
35 	struct ttm_base_object base;
36 	struct vmw_resource res;
37 	struct vmw_ctx_binding_state *cbs;
38 	struct vmw_cmdbuf_res_manager *man;
39 	struct vmw_resource *cotables[SVGA_COTABLE_MAX];
40 	spinlock_t cotable_lock;
41 	struct vmw_buffer_object *dx_query_mob;
42 };
43 
44 static void vmw_user_context_free(struct vmw_resource *res);
45 static struct vmw_resource *
46 vmw_user_context_base_to_res(struct ttm_base_object *base);
47 
48 static int vmw_gb_context_create(struct vmw_resource *res);
49 static int vmw_gb_context_bind(struct vmw_resource *res,
50 			       struct ttm_validate_buffer *val_buf);
51 static int vmw_gb_context_unbind(struct vmw_resource *res,
52 				 bool readback,
53 				 struct ttm_validate_buffer *val_buf);
54 static int vmw_gb_context_destroy(struct vmw_resource *res);
55 static int vmw_dx_context_create(struct vmw_resource *res);
56 static int vmw_dx_context_bind(struct vmw_resource *res,
57 			       struct ttm_validate_buffer *val_buf);
58 static int vmw_dx_context_unbind(struct vmw_resource *res,
59 				 bool readback,
60 				 struct ttm_validate_buffer *val_buf);
61 static int vmw_dx_context_destroy(struct vmw_resource *res);
62 
63 static uint64_t vmw_user_context_size;
64 
65 static const struct vmw_user_resource_conv user_context_conv = {
66 	.object_type = VMW_RES_CONTEXT,
67 	.base_obj_to_res = vmw_user_context_base_to_res,
68 	.res_free = vmw_user_context_free
69 };
70 
71 const struct vmw_user_resource_conv *user_context_converter =
72 	&user_context_conv;
73 
74 
75 static const struct vmw_res_func vmw_legacy_context_func = {
76 	.res_type = vmw_res_context,
77 	.needs_backup = false,
78 	.may_evict = false,
79 	.type_name = "legacy contexts",
80 	.backup_placement = NULL,
81 	.create = NULL,
82 	.destroy = NULL,
83 	.bind = NULL,
84 	.unbind = NULL
85 };
86 
87 static const struct vmw_res_func vmw_gb_context_func = {
88 	.res_type = vmw_res_context,
89 	.needs_backup = true,
90 	.may_evict = true,
91 	.prio = 3,
92 	.dirty_prio = 3,
93 	.type_name = "guest backed contexts",
94 	.backup_placement = &vmw_mob_placement,
95 	.create = vmw_gb_context_create,
96 	.destroy = vmw_gb_context_destroy,
97 	.bind = vmw_gb_context_bind,
98 	.unbind = vmw_gb_context_unbind
99 };
100 
101 static const struct vmw_res_func vmw_dx_context_func = {
102 	.res_type = vmw_res_dx_context,
103 	.needs_backup = true,
104 	.may_evict = true,
105 	.prio = 3,
106 	.dirty_prio = 3,
107 	.type_name = "dx contexts",
108 	.backup_placement = &vmw_mob_placement,
109 	.create = vmw_dx_context_create,
110 	.destroy = vmw_dx_context_destroy,
111 	.bind = vmw_dx_context_bind,
112 	.unbind = vmw_dx_context_unbind
113 };
114 
115 /**
116  * Context management:
117  */
118 
119 static void vmw_context_cotables_unref(struct vmw_private *dev_priv,
120 				       struct vmw_user_context *uctx)
121 {
122 	struct vmw_resource *res;
123 	int i;
124 	u32 cotable_max = has_sm5_context(dev_priv) ?
125 		SVGA_COTABLE_MAX : SVGA_COTABLE_DX10_MAX;
126 
127 	for (i = 0; i < cotable_max; ++i) {
128 		spin_lock(&uctx->cotable_lock);
129 		res = uctx->cotables[i];
130 		uctx->cotables[i] = NULL;
131 		spin_unlock(&uctx->cotable_lock);
132 
133 		if (res)
134 			vmw_resource_unreference(&res);
135 	}
136 }
137 
138 static void vmw_hw_context_destroy(struct vmw_resource *res)
139 {
140 	struct vmw_user_context *uctx =
141 		container_of(res, struct vmw_user_context, res);
142 	struct vmw_private *dev_priv = res->dev_priv;
143 	struct {
144 		SVGA3dCmdHeader header;
145 		SVGA3dCmdDestroyContext body;
146 	} *cmd;
147 
148 
149 	if (res->func->destroy == vmw_gb_context_destroy ||
150 	    res->func->destroy == vmw_dx_context_destroy) {
151 		mutex_lock(&dev_priv->cmdbuf_mutex);
152 		vmw_cmdbuf_res_man_destroy(uctx->man);
153 		mutex_lock(&dev_priv->binding_mutex);
154 		vmw_binding_state_kill(uctx->cbs);
155 		(void) res->func->destroy(res);
156 		mutex_unlock(&dev_priv->binding_mutex);
157 		if (dev_priv->pinned_bo != NULL &&
158 		    !dev_priv->query_cid_valid)
159 			__vmw_execbuf_release_pinned_bo(dev_priv, NULL);
160 		mutex_unlock(&dev_priv->cmdbuf_mutex);
161 		vmw_context_cotables_unref(dev_priv, uctx);
162 		return;
163 	}
164 
165 	vmw_execbuf_release_pinned_bo(dev_priv);
166 	cmd = VMW_FIFO_RESERVE(dev_priv, sizeof(*cmd));
167 	if (unlikely(cmd == NULL))
168 		return;
169 
170 	cmd->header.id = SVGA_3D_CMD_CONTEXT_DESTROY;
171 	cmd->header.size = sizeof(cmd->body);
172 	cmd->body.cid = res->id;
173 
174 	vmw_fifo_commit(dev_priv, sizeof(*cmd));
175 	vmw_fifo_resource_dec(dev_priv);
176 }
177 
178 static int vmw_gb_context_init(struct vmw_private *dev_priv,
179 			       bool dx,
180 			       struct vmw_resource *res,
181 			       void (*res_free)(struct vmw_resource *res))
182 {
183 	int ret, i;
184 	struct vmw_user_context *uctx =
185 		container_of(res, struct vmw_user_context, res);
186 
187 	res->backup_size = (dx ? sizeof(SVGADXContextMobFormat) :
188 			    SVGA3D_CONTEXT_DATA_SIZE);
189 	ret = vmw_resource_init(dev_priv, res, true,
190 				res_free,
191 				dx ? &vmw_dx_context_func :
192 				&vmw_gb_context_func);
193 	if (unlikely(ret != 0))
194 		goto out_err;
195 
196 	if (dev_priv->has_mob) {
197 		uctx->man = vmw_cmdbuf_res_man_create(dev_priv);
198 		if (IS_ERR(uctx->man)) {
199 			ret = PTR_ERR(uctx->man);
200 			uctx->man = NULL;
201 			goto out_err;
202 		}
203 	}
204 
205 	uctx->cbs = vmw_binding_state_alloc(dev_priv);
206 	if (IS_ERR(uctx->cbs)) {
207 		ret = PTR_ERR(uctx->cbs);
208 		goto out_err;
209 	}
210 
211 	spin_lock_init(&uctx->cotable_lock);
212 
213 	if (dx) {
214 		u32 cotable_max = has_sm5_context(dev_priv) ?
215 			SVGA_COTABLE_MAX : SVGA_COTABLE_DX10_MAX;
216 		for (i = 0; i < cotable_max; ++i) {
217 			uctx->cotables[i] = vmw_cotable_alloc(dev_priv,
218 							      &uctx->res, i);
219 			if (IS_ERR(uctx->cotables[i])) {
220 				ret = PTR_ERR(uctx->cotables[i]);
221 				goto out_cotables;
222 			}
223 		}
224 	}
225 
226 	res->hw_destroy = vmw_hw_context_destroy;
227 	return 0;
228 
229 out_cotables:
230 	vmw_context_cotables_unref(dev_priv, uctx);
231 out_err:
232 	if (res_free)
233 		res_free(res);
234 	else
235 		kfree(res);
236 	return ret;
237 }
238 
239 static int vmw_context_init(struct vmw_private *dev_priv,
240 			    struct vmw_resource *res,
241 			    void (*res_free)(struct vmw_resource *res),
242 			    bool dx)
243 {
244 	int ret;
245 
246 	struct {
247 		SVGA3dCmdHeader header;
248 		SVGA3dCmdDefineContext body;
249 	} *cmd;
250 
251 	if (dev_priv->has_mob)
252 		return vmw_gb_context_init(dev_priv, dx, res, res_free);
253 
254 	ret = vmw_resource_init(dev_priv, res, false,
255 				res_free, &vmw_legacy_context_func);
256 
257 	if (unlikely(ret != 0)) {
258 		DRM_ERROR("Failed to allocate a resource id.\n");
259 		goto out_early;
260 	}
261 
262 	if (unlikely(res->id >= SVGA3D_MAX_CONTEXT_IDS)) {
263 		DRM_ERROR("Out of hw context ids.\n");
264 		vmw_resource_unreference(&res);
265 		return -ENOMEM;
266 	}
267 
268 	cmd = VMW_FIFO_RESERVE(dev_priv, sizeof(*cmd));
269 	if (unlikely(cmd == NULL)) {
270 		vmw_resource_unreference(&res);
271 		return -ENOMEM;
272 	}
273 
274 	cmd->header.id = SVGA_3D_CMD_CONTEXT_DEFINE;
275 	cmd->header.size = sizeof(cmd->body);
276 	cmd->body.cid = res->id;
277 
278 	vmw_fifo_commit(dev_priv, sizeof(*cmd));
279 	vmw_fifo_resource_inc(dev_priv);
280 	res->hw_destroy = vmw_hw_context_destroy;
281 	return 0;
282 
283 out_early:
284 	if (res_free == NULL)
285 		kfree(res);
286 	else
287 		res_free(res);
288 	return ret;
289 }
290 
291 
292 /*
293  * GB context.
294  */
295 
296 static int vmw_gb_context_create(struct vmw_resource *res)
297 {
298 	struct vmw_private *dev_priv = res->dev_priv;
299 	int ret;
300 	struct {
301 		SVGA3dCmdHeader header;
302 		SVGA3dCmdDefineGBContext body;
303 	} *cmd;
304 
305 	if (likely(res->id != -1))
306 		return 0;
307 
308 	ret = vmw_resource_alloc_id(res);
309 	if (unlikely(ret != 0)) {
310 		DRM_ERROR("Failed to allocate a context id.\n");
311 		goto out_no_id;
312 	}
313 
314 	if (unlikely(res->id >= VMWGFX_NUM_GB_CONTEXT)) {
315 		ret = -EBUSY;
316 		goto out_no_fifo;
317 	}
318 
319 	cmd = VMW_FIFO_RESERVE(dev_priv, sizeof(*cmd));
320 	if (unlikely(cmd == NULL)) {
321 		ret = -ENOMEM;
322 		goto out_no_fifo;
323 	}
324 
325 	cmd->header.id = SVGA_3D_CMD_DEFINE_GB_CONTEXT;
326 	cmd->header.size = sizeof(cmd->body);
327 	cmd->body.cid = res->id;
328 	vmw_fifo_commit(dev_priv, sizeof(*cmd));
329 	vmw_fifo_resource_inc(dev_priv);
330 
331 	return 0;
332 
333 out_no_fifo:
334 	vmw_resource_release_id(res);
335 out_no_id:
336 	return ret;
337 }
338 
339 static int vmw_gb_context_bind(struct vmw_resource *res,
340 			       struct ttm_validate_buffer *val_buf)
341 {
342 	struct vmw_private *dev_priv = res->dev_priv;
343 	struct {
344 		SVGA3dCmdHeader header;
345 		SVGA3dCmdBindGBContext body;
346 	} *cmd;
347 	struct ttm_buffer_object *bo = val_buf->bo;
348 
349 	BUG_ON(bo->mem.mem_type != VMW_PL_MOB);
350 
351 	cmd = VMW_FIFO_RESERVE(dev_priv, sizeof(*cmd));
352 	if (unlikely(cmd == NULL))
353 		return -ENOMEM;
354 
355 	cmd->header.id = SVGA_3D_CMD_BIND_GB_CONTEXT;
356 	cmd->header.size = sizeof(cmd->body);
357 	cmd->body.cid = res->id;
358 	cmd->body.mobid = bo->mem.start;
359 	cmd->body.validContents = res->backup_dirty;
360 	res->backup_dirty = false;
361 	vmw_fifo_commit(dev_priv, sizeof(*cmd));
362 
363 	return 0;
364 }
365 
366 static int vmw_gb_context_unbind(struct vmw_resource *res,
367 				 bool readback,
368 				 struct ttm_validate_buffer *val_buf)
369 {
370 	struct vmw_private *dev_priv = res->dev_priv;
371 	struct ttm_buffer_object *bo = val_buf->bo;
372 	struct vmw_fence_obj *fence;
373 	struct vmw_user_context *uctx =
374 		container_of(res, struct vmw_user_context, res);
375 
376 	struct {
377 		SVGA3dCmdHeader header;
378 		SVGA3dCmdReadbackGBContext body;
379 	} *cmd1;
380 	struct {
381 		SVGA3dCmdHeader header;
382 		SVGA3dCmdBindGBContext body;
383 	} *cmd2;
384 	uint32_t submit_size;
385 	uint8_t *cmd;
386 
387 
388 	BUG_ON(bo->mem.mem_type != VMW_PL_MOB);
389 
390 	mutex_lock(&dev_priv->binding_mutex);
391 	vmw_binding_state_scrub(uctx->cbs);
392 
393 	submit_size = sizeof(*cmd2) + (readback ? sizeof(*cmd1) : 0);
394 
395 	cmd = VMW_FIFO_RESERVE(dev_priv, submit_size);
396 	if (unlikely(cmd == NULL)) {
397 		mutex_unlock(&dev_priv->binding_mutex);
398 		return -ENOMEM;
399 	}
400 
401 	cmd2 = (void *) cmd;
402 	if (readback) {
403 		cmd1 = (void *) cmd;
404 		cmd1->header.id = SVGA_3D_CMD_READBACK_GB_CONTEXT;
405 		cmd1->header.size = sizeof(cmd1->body);
406 		cmd1->body.cid = res->id;
407 		cmd2 = (void *) (&cmd1[1]);
408 	}
409 	cmd2->header.id = SVGA_3D_CMD_BIND_GB_CONTEXT;
410 	cmd2->header.size = sizeof(cmd2->body);
411 	cmd2->body.cid = res->id;
412 	cmd2->body.mobid = SVGA3D_INVALID_ID;
413 
414 	vmw_fifo_commit(dev_priv, submit_size);
415 	mutex_unlock(&dev_priv->binding_mutex);
416 
417 	/*
418 	 * Create a fence object and fence the backup buffer.
419 	 */
420 
421 	(void) vmw_execbuf_fence_commands(NULL, dev_priv,
422 					  &fence, NULL);
423 
424 	vmw_bo_fence_single(bo, fence);
425 
426 	if (likely(fence != NULL))
427 		vmw_fence_obj_unreference(&fence);
428 
429 	return 0;
430 }
431 
432 static int vmw_gb_context_destroy(struct vmw_resource *res)
433 {
434 	struct vmw_private *dev_priv = res->dev_priv;
435 	struct {
436 		SVGA3dCmdHeader header;
437 		SVGA3dCmdDestroyGBContext body;
438 	} *cmd;
439 
440 	if (likely(res->id == -1))
441 		return 0;
442 
443 	cmd = VMW_FIFO_RESERVE(dev_priv, sizeof(*cmd));
444 	if (unlikely(cmd == NULL))
445 		return -ENOMEM;
446 
447 	cmd->header.id = SVGA_3D_CMD_DESTROY_GB_CONTEXT;
448 	cmd->header.size = sizeof(cmd->body);
449 	cmd->body.cid = res->id;
450 	vmw_fifo_commit(dev_priv, sizeof(*cmd));
451 	if (dev_priv->query_cid == res->id)
452 		dev_priv->query_cid_valid = false;
453 	vmw_resource_release_id(res);
454 	vmw_fifo_resource_dec(dev_priv);
455 
456 	return 0;
457 }
458 
459 /*
460  * DX context.
461  */
462 
463 static int vmw_dx_context_create(struct vmw_resource *res)
464 {
465 	struct vmw_private *dev_priv = res->dev_priv;
466 	int ret;
467 	struct {
468 		SVGA3dCmdHeader header;
469 		SVGA3dCmdDXDefineContext body;
470 	} *cmd;
471 
472 	if (likely(res->id != -1))
473 		return 0;
474 
475 	ret = vmw_resource_alloc_id(res);
476 	if (unlikely(ret != 0)) {
477 		DRM_ERROR("Failed to allocate a context id.\n");
478 		goto out_no_id;
479 	}
480 
481 	if (unlikely(res->id >= VMWGFX_NUM_DXCONTEXT)) {
482 		ret = -EBUSY;
483 		goto out_no_fifo;
484 	}
485 
486 	cmd = VMW_FIFO_RESERVE(dev_priv, sizeof(*cmd));
487 	if (unlikely(cmd == NULL)) {
488 		ret = -ENOMEM;
489 		goto out_no_fifo;
490 	}
491 
492 	cmd->header.id = SVGA_3D_CMD_DX_DEFINE_CONTEXT;
493 	cmd->header.size = sizeof(cmd->body);
494 	cmd->body.cid = res->id;
495 	vmw_fifo_commit(dev_priv, sizeof(*cmd));
496 	vmw_fifo_resource_inc(dev_priv);
497 
498 	return 0;
499 
500 out_no_fifo:
501 	vmw_resource_release_id(res);
502 out_no_id:
503 	return ret;
504 }
505 
506 static int vmw_dx_context_bind(struct vmw_resource *res,
507 			       struct ttm_validate_buffer *val_buf)
508 {
509 	struct vmw_private *dev_priv = res->dev_priv;
510 	struct {
511 		SVGA3dCmdHeader header;
512 		SVGA3dCmdDXBindContext body;
513 	} *cmd;
514 	struct ttm_buffer_object *bo = val_buf->bo;
515 
516 	BUG_ON(bo->mem.mem_type != VMW_PL_MOB);
517 
518 	cmd = VMW_FIFO_RESERVE(dev_priv, sizeof(*cmd));
519 	if (unlikely(cmd == NULL))
520 		return -ENOMEM;
521 
522 	cmd->header.id = SVGA_3D_CMD_DX_BIND_CONTEXT;
523 	cmd->header.size = sizeof(cmd->body);
524 	cmd->body.cid = res->id;
525 	cmd->body.mobid = bo->mem.start;
526 	cmd->body.validContents = res->backup_dirty;
527 	res->backup_dirty = false;
528 	vmw_fifo_commit(dev_priv, sizeof(*cmd));
529 
530 
531 	return 0;
532 }
533 
534 /**
535  * vmw_dx_context_scrub_cotables - Scrub all bindings and
536  * cotables from a context
537  *
538  * @ctx: Pointer to the context resource
539  * @readback: Whether to save the otable contents on scrubbing.
540  *
541  * COtables must be unbound before their context, but unbinding requires
542  * the backup buffer being reserved, whereas scrubbing does not.
543  * This function scrubs all cotables of a context, potentially reading back
544  * the contents into their backup buffers. However, scrubbing cotables
545  * also makes the device context invalid, so scrub all bindings first so
546  * that doesn't have to be done later with an invalid context.
547  */
548 void vmw_dx_context_scrub_cotables(struct vmw_resource *ctx,
549 				   bool readback)
550 {
551 	struct vmw_user_context *uctx =
552 		container_of(ctx, struct vmw_user_context, res);
553 	u32 cotable_max = has_sm5_context(ctx->dev_priv) ?
554 		SVGA_COTABLE_MAX : SVGA_COTABLE_DX10_MAX;
555 	int i;
556 
557 	vmw_binding_state_scrub(uctx->cbs);
558 	for (i = 0; i < cotable_max; ++i) {
559 		struct vmw_resource *res;
560 
561 		/* Avoid racing with ongoing cotable destruction. */
562 		spin_lock(&uctx->cotable_lock);
563 		res = uctx->cotables[vmw_cotable_scrub_order[i]];
564 		if (res)
565 			res = vmw_resource_reference_unless_doomed(res);
566 		spin_unlock(&uctx->cotable_lock);
567 		if (!res)
568 			continue;
569 
570 		WARN_ON(vmw_cotable_scrub(res, readback));
571 		vmw_resource_unreference(&res);
572 	}
573 }
574 
575 static int vmw_dx_context_unbind(struct vmw_resource *res,
576 				 bool readback,
577 				 struct ttm_validate_buffer *val_buf)
578 {
579 	struct vmw_private *dev_priv = res->dev_priv;
580 	struct ttm_buffer_object *bo = val_buf->bo;
581 	struct vmw_fence_obj *fence;
582 	struct vmw_user_context *uctx =
583 		container_of(res, struct vmw_user_context, res);
584 
585 	struct {
586 		SVGA3dCmdHeader header;
587 		SVGA3dCmdDXReadbackContext body;
588 	} *cmd1;
589 	struct {
590 		SVGA3dCmdHeader header;
591 		SVGA3dCmdDXBindContext body;
592 	} *cmd2;
593 	uint32_t submit_size;
594 	uint8_t *cmd;
595 
596 
597 	BUG_ON(bo->mem.mem_type != VMW_PL_MOB);
598 
599 	mutex_lock(&dev_priv->binding_mutex);
600 	vmw_dx_context_scrub_cotables(res, readback);
601 
602 	if (uctx->dx_query_mob && uctx->dx_query_mob->dx_query_ctx &&
603 	    readback) {
604 		WARN_ON(uctx->dx_query_mob->dx_query_ctx != res);
605 		if (vmw_query_readback_all(uctx->dx_query_mob))
606 			DRM_ERROR("Failed to read back query states\n");
607 	}
608 
609 	submit_size = sizeof(*cmd2) + (readback ? sizeof(*cmd1) : 0);
610 
611 	cmd = VMW_FIFO_RESERVE(dev_priv, submit_size);
612 	if (unlikely(cmd == NULL)) {
613 		mutex_unlock(&dev_priv->binding_mutex);
614 		return -ENOMEM;
615 	}
616 
617 	cmd2 = (void *) cmd;
618 	if (readback) {
619 		cmd1 = (void *) cmd;
620 		cmd1->header.id = SVGA_3D_CMD_DX_READBACK_CONTEXT;
621 		cmd1->header.size = sizeof(cmd1->body);
622 		cmd1->body.cid = res->id;
623 		cmd2 = (void *) (&cmd1[1]);
624 	}
625 	cmd2->header.id = SVGA_3D_CMD_DX_BIND_CONTEXT;
626 	cmd2->header.size = sizeof(cmd2->body);
627 	cmd2->body.cid = res->id;
628 	cmd2->body.mobid = SVGA3D_INVALID_ID;
629 
630 	vmw_fifo_commit(dev_priv, submit_size);
631 	mutex_unlock(&dev_priv->binding_mutex);
632 
633 	/*
634 	 * Create a fence object and fence the backup buffer.
635 	 */
636 
637 	(void) vmw_execbuf_fence_commands(NULL, dev_priv,
638 					  &fence, NULL);
639 
640 	vmw_bo_fence_single(bo, fence);
641 
642 	if (likely(fence != NULL))
643 		vmw_fence_obj_unreference(&fence);
644 
645 	return 0;
646 }
647 
648 static int vmw_dx_context_destroy(struct vmw_resource *res)
649 {
650 	struct vmw_private *dev_priv = res->dev_priv;
651 	struct {
652 		SVGA3dCmdHeader header;
653 		SVGA3dCmdDXDestroyContext body;
654 	} *cmd;
655 
656 	if (likely(res->id == -1))
657 		return 0;
658 
659 	cmd = VMW_FIFO_RESERVE(dev_priv, sizeof(*cmd));
660 	if (unlikely(cmd == NULL))
661 		return -ENOMEM;
662 
663 	cmd->header.id = SVGA_3D_CMD_DX_DESTROY_CONTEXT;
664 	cmd->header.size = sizeof(cmd->body);
665 	cmd->body.cid = res->id;
666 	vmw_fifo_commit(dev_priv, sizeof(*cmd));
667 	if (dev_priv->query_cid == res->id)
668 		dev_priv->query_cid_valid = false;
669 	vmw_resource_release_id(res);
670 	vmw_fifo_resource_dec(dev_priv);
671 
672 	return 0;
673 }
674 
675 /**
676  * User-space context management:
677  */
678 
679 static struct vmw_resource *
680 vmw_user_context_base_to_res(struct ttm_base_object *base)
681 {
682 	return &(container_of(base, struct vmw_user_context, base)->res);
683 }
684 
685 static void vmw_user_context_free(struct vmw_resource *res)
686 {
687 	struct vmw_user_context *ctx =
688 	    container_of(res, struct vmw_user_context, res);
689 	struct vmw_private *dev_priv = res->dev_priv;
690 
691 	if (ctx->cbs)
692 		vmw_binding_state_free(ctx->cbs);
693 
694 	(void) vmw_context_bind_dx_query(res, NULL);
695 
696 	ttm_base_object_kfree(ctx, base);
697 	ttm_mem_global_free(vmw_mem_glob(dev_priv),
698 			    vmw_user_context_size);
699 }
700 
701 /**
702  * This function is called when user space has no more references on the
703  * base object. It releases the base-object's reference on the resource object.
704  */
705 
706 static void vmw_user_context_base_release(struct ttm_base_object **p_base)
707 {
708 	struct ttm_base_object *base = *p_base;
709 	struct vmw_user_context *ctx =
710 	    container_of(base, struct vmw_user_context, base);
711 	struct vmw_resource *res = &ctx->res;
712 
713 	*p_base = NULL;
714 	vmw_resource_unreference(&res);
715 }
716 
717 int vmw_context_destroy_ioctl(struct drm_device *dev, void *data,
718 			      struct drm_file *file_priv)
719 {
720 	struct drm_vmw_context_arg *arg = (struct drm_vmw_context_arg *)data;
721 	struct ttm_object_file *tfile = vmw_fpriv(file_priv)->tfile;
722 
723 	return ttm_ref_object_base_unref(tfile, arg->cid, TTM_REF_USAGE);
724 }
725 
726 static int vmw_context_define(struct drm_device *dev, void *data,
727 			      struct drm_file *file_priv, bool dx)
728 {
729 	struct vmw_private *dev_priv = vmw_priv(dev);
730 	struct vmw_user_context *ctx;
731 	struct vmw_resource *res;
732 	struct vmw_resource *tmp;
733 	struct drm_vmw_context_arg *arg = (struct drm_vmw_context_arg *)data;
734 	struct ttm_object_file *tfile = vmw_fpriv(file_priv)->tfile;
735 	struct ttm_operation_ctx ttm_opt_ctx = {
736 		.interruptible = true,
737 		.no_wait_gpu = false
738 	};
739 	int ret;
740 
741 	if (!has_sm4_context(dev_priv) && dx) {
742 		VMW_DEBUG_USER("DX contexts not supported by device.\n");
743 		return -EINVAL;
744 	}
745 
746 	if (unlikely(vmw_user_context_size == 0))
747 		vmw_user_context_size = ttm_round_pot(sizeof(*ctx)) +
748 		  ((dev_priv->has_mob) ? vmw_cmdbuf_res_man_size() : 0) +
749 		  + VMW_IDA_ACC_SIZE + TTM_OBJ_EXTRA_SIZE;
750 
751 	ret = ttm_read_lock(&dev_priv->reservation_sem, true);
752 	if (unlikely(ret != 0))
753 		return ret;
754 
755 	ret = ttm_mem_global_alloc(vmw_mem_glob(dev_priv),
756 				   vmw_user_context_size,
757 				   &ttm_opt_ctx);
758 	if (unlikely(ret != 0)) {
759 		if (ret != -ERESTARTSYS)
760 			DRM_ERROR("Out of graphics memory for context"
761 				  " creation.\n");
762 		goto out_unlock;
763 	}
764 
765 	ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
766 	if (unlikely(!ctx)) {
767 		ttm_mem_global_free(vmw_mem_glob(dev_priv),
768 				    vmw_user_context_size);
769 		ret = -ENOMEM;
770 		goto out_unlock;
771 	}
772 
773 	res = &ctx->res;
774 	ctx->base.shareable = false;
775 	ctx->base.tfile = NULL;
776 
777 	/*
778 	 * From here on, the destructor takes over resource freeing.
779 	 */
780 
781 	ret = vmw_context_init(dev_priv, res, vmw_user_context_free, dx);
782 	if (unlikely(ret != 0))
783 		goto out_unlock;
784 
785 	tmp = vmw_resource_reference(&ctx->res);
786 	ret = ttm_base_object_init(tfile, &ctx->base, false, VMW_RES_CONTEXT,
787 				   &vmw_user_context_base_release, NULL);
788 
789 	if (unlikely(ret != 0)) {
790 		vmw_resource_unreference(&tmp);
791 		goto out_err;
792 	}
793 
794 	arg->cid = ctx->base.handle;
795 out_err:
796 	vmw_resource_unreference(&res);
797 out_unlock:
798 	ttm_read_unlock(&dev_priv->reservation_sem);
799 	return ret;
800 }
801 
802 int vmw_context_define_ioctl(struct drm_device *dev, void *data,
803 			     struct drm_file *file_priv)
804 {
805 	return vmw_context_define(dev, data, file_priv, false);
806 }
807 
808 int vmw_extended_context_define_ioctl(struct drm_device *dev, void *data,
809 				      struct drm_file *file_priv)
810 {
811 	union drm_vmw_extended_context_arg *arg = (typeof(arg)) data;
812 	struct drm_vmw_context_arg *rep = &arg->rep;
813 
814 	switch (arg->req) {
815 	case drm_vmw_context_legacy:
816 		return vmw_context_define(dev, rep, file_priv, false);
817 	case drm_vmw_context_dx:
818 		return vmw_context_define(dev, rep, file_priv, true);
819 	default:
820 		break;
821 	}
822 	return -EINVAL;
823 }
824 
825 /**
826  * vmw_context_binding_list - Return a list of context bindings
827  *
828  * @ctx: The context resource
829  *
830  * Returns the current list of bindings of the given context. Note that
831  * this list becomes stale as soon as the dev_priv::binding_mutex is unlocked.
832  */
833 struct list_head *vmw_context_binding_list(struct vmw_resource *ctx)
834 {
835 	struct vmw_user_context *uctx =
836 		container_of(ctx, struct vmw_user_context, res);
837 
838 	return vmw_binding_state_list(uctx->cbs);
839 }
840 
841 struct vmw_cmdbuf_res_manager *vmw_context_res_man(struct vmw_resource *ctx)
842 {
843 	return container_of(ctx, struct vmw_user_context, res)->man;
844 }
845 
846 struct vmw_resource *vmw_context_cotable(struct vmw_resource *ctx,
847 					 SVGACOTableType cotable_type)
848 {
849 	u32 cotable_max = has_sm5_context(ctx->dev_priv) ?
850 		SVGA_COTABLE_MAX : SVGA_COTABLE_DX10_MAX;
851 
852 	if (cotable_type >= cotable_max)
853 		return ERR_PTR(-EINVAL);
854 
855 	return container_of(ctx, struct vmw_user_context, res)->
856 		cotables[cotable_type];
857 }
858 
859 /**
860  * vmw_context_binding_state -
861  * Return a pointer to a context binding state structure
862  *
863  * @ctx: The context resource
864  *
865  * Returns the current state of bindings of the given context. Note that
866  * this state becomes stale as soon as the dev_priv::binding_mutex is unlocked.
867  */
868 struct vmw_ctx_binding_state *
869 vmw_context_binding_state(struct vmw_resource *ctx)
870 {
871 	return container_of(ctx, struct vmw_user_context, res)->cbs;
872 }
873 
874 /**
875  * vmw_context_bind_dx_query -
876  * Sets query MOB for the context.  If @mob is NULL, then this function will
877  * remove the association between the MOB and the context.  This function
878  * assumes the binding_mutex is held.
879  *
880  * @ctx_res: The context resource
881  * @mob: a reference to the query MOB
882  *
883  * Returns -EINVAL if a MOB has already been set and does not match the one
884  * specified in the parameter.  0 otherwise.
885  */
886 int vmw_context_bind_dx_query(struct vmw_resource *ctx_res,
887 			      struct vmw_buffer_object *mob)
888 {
889 	struct vmw_user_context *uctx =
890 		container_of(ctx_res, struct vmw_user_context, res);
891 
892 	if (mob == NULL) {
893 		if (uctx->dx_query_mob) {
894 			uctx->dx_query_mob->dx_query_ctx = NULL;
895 			vmw_bo_unreference(&uctx->dx_query_mob);
896 			uctx->dx_query_mob = NULL;
897 		}
898 
899 		return 0;
900 	}
901 
902 	/* Can only have one MOB per context for queries */
903 	if (uctx->dx_query_mob && uctx->dx_query_mob != mob)
904 		return -EINVAL;
905 
906 	mob->dx_query_ctx  = ctx_res;
907 
908 	if (!uctx->dx_query_mob)
909 		uctx->dx_query_mob = vmw_bo_reference(mob);
910 
911 	return 0;
912 }
913 
914 /**
915  * vmw_context_get_dx_query_mob - Returns non-counted reference to DX query mob
916  *
917  * @ctx_res: The context resource
918  */
919 struct vmw_buffer_object *
920 vmw_context_get_dx_query_mob(struct vmw_resource *ctx_res)
921 {
922 	struct vmw_user_context *uctx =
923 		container_of(ctx_res, struct vmw_user_context, res);
924 
925 	return uctx->dx_query_mob;
926 }
927