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1// SPDX-License-Identifier: GPL-2.0 OR MIT
2/**************************************************************************
3 *
4 * Copyright 2014-2015 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 * Treat context OTables as resources to make use of the resource
29 * backing MOB eviction mechanism, that is used to read back the COTable
30 * whenever the backing MOB is evicted.
31 */
32
33#include <drm/ttm/ttm_placement.h>
34
35#include "vmwgfx_drv.h"
36#include "vmwgfx_resource_priv.h"
37#include "vmwgfx_so.h"
38
39/**
40 * struct vmw_cotable - Context Object Table resource
41 *
42 * @res: struct vmw_resource we are deriving from.
43 * @ctx: non-refcounted pointer to the owning context.
44 * @size_read_back: Size of data read back during eviction.
45 * @seen_entries: Seen entries in command stream for this cotable.
46 * @type: The cotable type.
47 * @scrubbed: Whether the cotable has been scrubbed.
48 * @resource_list: List of resources in the cotable.
49 */
50struct vmw_cotable {
51 struct vmw_resource res;
52 struct vmw_resource *ctx;
53 size_t size_read_back;
54 int seen_entries;
55 u32 type;
56 bool scrubbed;
57 struct list_head resource_list;
58};
59
60/**
61 * struct vmw_cotable_info - Static info about cotable types
62 *
63 * @min_initial_entries: Min number of initial intries at cotable allocation
64 * for this cotable type.
65 * @size: Size of each entry.
66 */
67struct vmw_cotable_info {
68 u32 min_initial_entries;
69 u32 size;
70 void (*unbind_func)(struct vmw_private *, struct list_head *,
71 bool);
72};
73
74static const struct vmw_cotable_info co_info[] = {
75 {1, sizeof(SVGACOTableDXRTViewEntry), &vmw_view_cotable_list_destroy},
76 {1, sizeof(SVGACOTableDXDSViewEntry), &vmw_view_cotable_list_destroy},
77 {1, sizeof(SVGACOTableDXSRViewEntry), &vmw_view_cotable_list_destroy},
78 {1, sizeof(SVGACOTableDXElementLayoutEntry), NULL},
79 {1, sizeof(SVGACOTableDXBlendStateEntry), NULL},
80 {1, sizeof(SVGACOTableDXDepthStencilEntry), NULL},
81 {1, sizeof(SVGACOTableDXRasterizerStateEntry), NULL},
82 {1, sizeof(SVGACOTableDXSamplerEntry), NULL},
83 {1, sizeof(SVGACOTableDXStreamOutputEntry), &vmw_dx_streamoutput_cotable_list_scrub},
84 {1, sizeof(SVGACOTableDXQueryEntry), NULL},
85 {1, sizeof(SVGACOTableDXShaderEntry), &vmw_dx_shader_cotable_list_scrub},
86 {1, sizeof(SVGACOTableDXUAViewEntry), &vmw_view_cotable_list_destroy}
87};
88
89/*
90 * Cotables with bindings that we remove must be scrubbed first,
91 * otherwise, the device will swap in an invalid context when we remove
92 * bindings before scrubbing a cotable...
93 */
94const SVGACOTableType vmw_cotable_scrub_order[] = {
95 SVGA_COTABLE_RTVIEW,
96 SVGA_COTABLE_DSVIEW,
97 SVGA_COTABLE_SRVIEW,
98 SVGA_COTABLE_DXSHADER,
99 SVGA_COTABLE_ELEMENTLAYOUT,
100 SVGA_COTABLE_BLENDSTATE,
101 SVGA_COTABLE_DEPTHSTENCIL,
102 SVGA_COTABLE_RASTERIZERSTATE,
103 SVGA_COTABLE_SAMPLER,
104 SVGA_COTABLE_STREAMOUTPUT,
105 SVGA_COTABLE_DXQUERY,
106 SVGA_COTABLE_UAVIEW,
107};
108
109static int vmw_cotable_bind(struct vmw_resource *res,
110 struct ttm_validate_buffer *val_buf);
111static int vmw_cotable_unbind(struct vmw_resource *res,
112 bool readback,
113 struct ttm_validate_buffer *val_buf);
114static int vmw_cotable_create(struct vmw_resource *res);
115static int vmw_cotable_destroy(struct vmw_resource *res);
116
117static const struct vmw_res_func vmw_cotable_func = {
118 .res_type = vmw_res_cotable,
119 .needs_backup = true,
120 .may_evict = true,
121 .prio = 3,
122 .dirty_prio = 3,
123 .type_name = "context guest backed object tables",
124 .backup_placement = &vmw_mob_placement,
125 .create = vmw_cotable_create,
126 .destroy = vmw_cotable_destroy,
127 .bind = vmw_cotable_bind,
128 .unbind = vmw_cotable_unbind,
129};
130
131/**
132 * vmw_cotable - Convert a struct vmw_resource pointer to a struct
133 * vmw_cotable pointer
134 *
135 * @res: Pointer to the resource.
136 */
137static struct vmw_cotable *vmw_cotable(struct vmw_resource *res)
138{
139 return container_of(res, struct vmw_cotable, res);
140}
141
142/**
143 * vmw_cotable_destroy - Cotable resource destroy callback
144 *
145 * @res: Pointer to the cotable resource.
146 *
147 * There is no device cotable destroy command, so this function only
148 * makes sure that the resource id is set to invalid.
149 */
150static int vmw_cotable_destroy(struct vmw_resource *res)
151{
152 res->id = -1;
153 return 0;
154}
155
156/**
157 * vmw_cotable_unscrub - Undo a cotable unscrub operation
158 *
159 * @res: Pointer to the cotable resource
160 *
161 * This function issues commands to (re)bind the cotable to
162 * its backing mob, which needs to be validated and reserved at this point.
163 * This is identical to bind() except the function interface looks different.
164 */
165static int vmw_cotable_unscrub(struct vmw_resource *res)
166{
167 struct vmw_cotable *vcotbl = vmw_cotable(res);
168 struct vmw_private *dev_priv = res->dev_priv;
169 struct ttm_buffer_object *bo = &res->backup->base;
170 struct {
171 SVGA3dCmdHeader header;
172 SVGA3dCmdDXSetCOTable body;
173 } *cmd;
174
175 WARN_ON_ONCE(bo->mem.mem_type != VMW_PL_MOB);
176 dma_resv_assert_held(bo->base.resv);
177
178 cmd = VMW_FIFO_RESERVE(dev_priv, sizeof(*cmd));
179 if (!cmd)
180 return -ENOMEM;
181
182 WARN_ON(vcotbl->ctx->id == SVGA3D_INVALID_ID);
183 WARN_ON(bo->mem.mem_type != VMW_PL_MOB);
184 cmd->header.id = SVGA_3D_CMD_DX_SET_COTABLE;
185 cmd->header.size = sizeof(cmd->body);
186 cmd->body.cid = vcotbl->ctx->id;
187 cmd->body.type = vcotbl->type;
188 cmd->body.mobid = bo->mem.start;
189 cmd->body.validSizeInBytes = vcotbl->size_read_back;
190
191 vmw_fifo_commit_flush(dev_priv, sizeof(*cmd));
192 vcotbl->scrubbed = false;
193
194 return 0;
195}
196
197/**
198 * vmw_cotable_bind - Undo a cotable unscrub operation
199 *
200 * @res: Pointer to the cotable resource
201 * @val_buf: Pointer to a struct ttm_validate_buffer prepared by the caller
202 * for convenience / fencing.
203 *
204 * This function issues commands to (re)bind the cotable to
205 * its backing mob, which needs to be validated and reserved at this point.
206 */
207static int vmw_cotable_bind(struct vmw_resource *res,
208 struct ttm_validate_buffer *val_buf)
209{
210 /*
211 * The create() callback may have changed @res->backup without
212 * the caller noticing, and with val_buf->bo still pointing to
213 * the old backup buffer. Although hackish, and not used currently,
214 * take the opportunity to correct the value here so that it's not
215 * misused in the future.
216 */
217 val_buf->bo = &res->backup->base;
218
219 return vmw_cotable_unscrub(res);
220}
221
222/**
223 * vmw_cotable_scrub - Scrub the cotable from the device.
224 *
225 * @res: Pointer to the cotable resource.
226 * @readback: Whether initiate a readback of the cotable data to the backup
227 * buffer.
228 *
229 * In some situations (context swapouts) it might be desirable to make the
230 * device forget about the cotable without performing a full unbind. A full
231 * unbind requires reserved backup buffers and it might not be possible to
232 * reserve them due to locking order violation issues. The vmw_cotable_scrub
233 * function implements a partial unbind() without that requirement but with the
234 * following restrictions.
235 * 1) Before the cotable is again used by the GPU, vmw_cotable_unscrub() must
236 * be called.
237 * 2) Before the cotable backing buffer is used by the CPU, or during the
238 * resource destruction, vmw_cotable_unbind() must be called.
239 */
240int vmw_cotable_scrub(struct vmw_resource *res, bool readback)
241{
242 struct vmw_cotable *vcotbl = vmw_cotable(res);
243 struct vmw_private *dev_priv = res->dev_priv;
244 size_t submit_size;
245
246 struct {
247 SVGA3dCmdHeader header;
248 SVGA3dCmdDXReadbackCOTable body;
249 } *cmd0;
250 struct {
251 SVGA3dCmdHeader header;
252 SVGA3dCmdDXSetCOTable body;
253 } *cmd1;
254
255 if (vcotbl->scrubbed)
256 return 0;
257
258 if (co_info[vcotbl->type].unbind_func)
259 co_info[vcotbl->type].unbind_func(dev_priv,
260 &vcotbl->resource_list,
261 readback);
262 submit_size = sizeof(*cmd1);
263 if (readback)
264 submit_size += sizeof(*cmd0);
265
266 cmd1 = VMW_FIFO_RESERVE(dev_priv, submit_size);
267 if (!cmd1)
268 return -ENOMEM;
269
270 vcotbl->size_read_back = 0;
271 if (readback) {
272 cmd0 = (void *) cmd1;
273 cmd0->header.id = SVGA_3D_CMD_DX_READBACK_COTABLE;
274 cmd0->header.size = sizeof(cmd0->body);
275 cmd0->body.cid = vcotbl->ctx->id;
276 cmd0->body.type = vcotbl->type;
277 cmd1 = (void *) &cmd0[1];
278 vcotbl->size_read_back = res->backup_size;
279 }
280 cmd1->header.id = SVGA_3D_CMD_DX_SET_COTABLE;
281 cmd1->header.size = sizeof(cmd1->body);
282 cmd1->body.cid = vcotbl->ctx->id;
283 cmd1->body.type = vcotbl->type;
284 cmd1->body.mobid = SVGA3D_INVALID_ID;
285 cmd1->body.validSizeInBytes = 0;
286 vmw_fifo_commit_flush(dev_priv, submit_size);
287 vcotbl->scrubbed = true;
288
289 /* Trigger a create() on next validate. */
290 res->id = -1;
291
292 return 0;
293}
294
295/**
296 * vmw_cotable_unbind - Cotable resource unbind callback
297 *
298 * @res: Pointer to the cotable resource.
299 * @readback: Whether to read back cotable data to the backup buffer.
300 * val_buf: Pointer to a struct ttm_validate_buffer prepared by the caller
301 * for convenience / fencing.
302 *
303 * Unbinds the cotable from the device and fences the backup buffer.
304 */
305static int vmw_cotable_unbind(struct vmw_resource *res,
306 bool readback,
307 struct ttm_validate_buffer *val_buf)
308{
309 struct vmw_cotable *vcotbl = vmw_cotable(res);
310 struct vmw_private *dev_priv = res->dev_priv;
311 struct ttm_buffer_object *bo = val_buf->bo;
312 struct vmw_fence_obj *fence;
313
314 if (!vmw_resource_mob_attached(res))
315 return 0;
316
317 WARN_ON_ONCE(bo->mem.mem_type != VMW_PL_MOB);
318 dma_resv_assert_held(bo->base.resv);
319
320 mutex_lock(&dev_priv->binding_mutex);
321 if (!vcotbl->scrubbed)
322 vmw_dx_context_scrub_cotables(vcotbl->ctx, readback);
323 mutex_unlock(&dev_priv->binding_mutex);
324 (void) vmw_execbuf_fence_commands(NULL, dev_priv, &fence, NULL);
325 vmw_bo_fence_single(bo, fence);
326 if (likely(fence != NULL))
327 vmw_fence_obj_unreference(&fence);
328
329 return 0;
330}
331
332/**
333 * vmw_cotable_readback - Read back a cotable without unbinding.
334 *
335 * @res: The cotable resource.
336 *
337 * Reads back a cotable to its backing mob without scrubbing the MOB from
338 * the cotable. The MOB is fenced for subsequent CPU access.
339 */
340static int vmw_cotable_readback(struct vmw_resource *res)
341{
342 struct vmw_cotable *vcotbl = vmw_cotable(res);
343 struct vmw_private *dev_priv = res->dev_priv;
344
345 struct {
346 SVGA3dCmdHeader header;
347 SVGA3dCmdDXReadbackCOTable body;
348 } *cmd;
349 struct vmw_fence_obj *fence;
350
351 if (!vcotbl->scrubbed) {
352 cmd = VMW_FIFO_RESERVE(dev_priv, sizeof(*cmd));
353 if (!cmd)
354 return -ENOMEM;
355
356 cmd->header.id = SVGA_3D_CMD_DX_READBACK_COTABLE;
357 cmd->header.size = sizeof(cmd->body);
358 cmd->body.cid = vcotbl->ctx->id;
359 cmd->body.type = vcotbl->type;
360 vcotbl->size_read_back = res->backup_size;
361 vmw_fifo_commit(dev_priv, sizeof(*cmd));
362 }
363
364 (void) vmw_execbuf_fence_commands(NULL, dev_priv, &fence, NULL);
365 vmw_bo_fence_single(&res->backup->base, fence);
366 vmw_fence_obj_unreference(&fence);
367
368 return 0;
369}
370
371/**
372 * vmw_cotable_resize - Resize a cotable.
373 *
374 * @res: The cotable resource.
375 * @new_size: The new size.
376 *
377 * Resizes a cotable and binds the new backup buffer.
378 * On failure the cotable is left intact.
379 * Important! This function may not fail once the MOB switch has been
380 * committed to hardware. That would put the device context in an
381 * invalid state which we can't currently recover from.
382 */
383static int vmw_cotable_resize(struct vmw_resource *res, size_t new_size)
384{
385 struct ttm_operation_ctx ctx = { false, false };
386 struct vmw_private *dev_priv = res->dev_priv;
387 struct vmw_cotable *vcotbl = vmw_cotable(res);
388 struct vmw_buffer_object *buf, *old_buf = res->backup;
389 struct ttm_buffer_object *bo, *old_bo = &res->backup->base;
390 size_t old_size = res->backup_size;
391 size_t old_size_read_back = vcotbl->size_read_back;
392 size_t cur_size_read_back;
393 struct ttm_bo_kmap_obj old_map, new_map;
394 int ret;
395 size_t i;
396
397 ret = vmw_cotable_readback(res);
398 if (ret)
399 return ret;
400
401 cur_size_read_back = vcotbl->size_read_back;
402 vcotbl->size_read_back = old_size_read_back;
403
404 /*
405 * While device is processing, Allocate and reserve a buffer object
406 * for the new COTable. Initially pin the buffer object to make sure
407 * we can use tryreserve without failure.
408 */
409 buf = kzalloc(sizeof(*buf), GFP_KERNEL);
410 if (!buf)
411 return -ENOMEM;
412
413 ret = vmw_bo_init(dev_priv, buf, new_size, &vmw_mob_ne_placement,
414 true, vmw_bo_bo_free);
415 if (ret) {
416 DRM_ERROR("Failed initializing new cotable MOB.\n");
417 return ret;
418 }
419
420 bo = &buf->base;
421 WARN_ON_ONCE(ttm_bo_reserve(bo, false, true, NULL));
422
423 ret = ttm_bo_wait(old_bo, false, false);
424 if (unlikely(ret != 0)) {
425 DRM_ERROR("Failed waiting for cotable unbind.\n");
426 goto out_wait;
427 }
428
429 /*
430 * Do a page by page copy of COTables. This eliminates slow vmap()s.
431 * This should really be a TTM utility.
432 */
433 for (i = 0; i < old_bo->num_pages; ++i) {
434 bool dummy;
435
436 ret = ttm_bo_kmap(old_bo, i, 1, &old_map);
437 if (unlikely(ret != 0)) {
438 DRM_ERROR("Failed mapping old COTable on resize.\n");
439 goto out_wait;
440 }
441 ret = ttm_bo_kmap(bo, i, 1, &new_map);
442 if (unlikely(ret != 0)) {
443 DRM_ERROR("Failed mapping new COTable on resize.\n");
444 goto out_map_new;
445 }
446 memcpy(ttm_kmap_obj_virtual(&new_map, &dummy),
447 ttm_kmap_obj_virtual(&old_map, &dummy),
448 PAGE_SIZE);
449 ttm_bo_kunmap(&new_map);
450 ttm_bo_kunmap(&old_map);
451 }
452
453 /* Unpin new buffer, and switch backup buffers. */
454 ret = ttm_bo_validate(bo, &vmw_mob_placement, &ctx);
455 if (unlikely(ret != 0)) {
456 DRM_ERROR("Failed validating new COTable backup buffer.\n");
457 goto out_wait;
458 }
459
460 vmw_resource_mob_detach(res);
461 res->backup = buf;
462 res->backup_size = new_size;
463 vcotbl->size_read_back = cur_size_read_back;
464
465 /*
466 * Now tell the device to switch. If this fails, then we need to
467 * revert the full resize.
468 */
469 ret = vmw_cotable_unscrub(res);
470 if (ret) {
471 DRM_ERROR("Failed switching COTable backup buffer.\n");
472 res->backup = old_buf;
473 res->backup_size = old_size;
474 vcotbl->size_read_back = old_size_read_back;
475 vmw_resource_mob_attach(res);
476 goto out_wait;
477 }
478
479 vmw_resource_mob_attach(res);
480 /* Let go of the old mob. */
481 vmw_bo_unreference(&old_buf);
482 res->id = vcotbl->type;
483
484 return 0;
485
486out_map_new:
487 ttm_bo_kunmap(&old_map);
488out_wait:
489 ttm_bo_unreserve(bo);
490 vmw_bo_unreference(&buf);
491
492 return ret;
493}
494
495/**
496 * vmw_cotable_create - Cotable resource create callback
497 *
498 * @res: Pointer to a cotable resource.
499 *
500 * There is no separate create command for cotables, so this callback, which
501 * is called before bind() in the validation sequence is instead used for two
502 * things.
503 * 1) Unscrub the cotable if it is scrubbed and still attached to a backup
504 * buffer.
505 * 2) Resize the cotable if needed.
506 */
507static int vmw_cotable_create(struct vmw_resource *res)
508{
509 struct vmw_cotable *vcotbl = vmw_cotable(res);
510 size_t new_size = res->backup_size;
511 size_t needed_size;
512 int ret;
513
514 /* Check whether we need to resize the cotable */
515 needed_size = (vcotbl->seen_entries + 1) * co_info[vcotbl->type].size;
516 while (needed_size > new_size)
517 new_size *= 2;
518
519 if (likely(new_size <= res->backup_size)) {
520 if (vcotbl->scrubbed && vmw_resource_mob_attached(res)) {
521 ret = vmw_cotable_unscrub(res);
522 if (ret)
523 return ret;
524 }
525 res->id = vcotbl->type;
526 return 0;
527 }
528
529 return vmw_cotable_resize(res, new_size);
530}
531
532/**
533 * vmw_hw_cotable_destroy - Cotable hw_destroy callback
534 *
535 * @res: Pointer to a cotable resource.
536 *
537 * The final (part of resource destruction) destroy callback.
538 */
539static void vmw_hw_cotable_destroy(struct vmw_resource *res)
540{
541 (void) vmw_cotable_destroy(res);
542}
543
544static size_t cotable_acc_size;
545
546/**
547 * vmw_cotable_free - Cotable resource destructor
548 *
549 * @res: Pointer to a cotable resource.
550 */
551static void vmw_cotable_free(struct vmw_resource *res)
552{
553 struct vmw_private *dev_priv = res->dev_priv;
554
555 kfree(res);
556 ttm_mem_global_free(vmw_mem_glob(dev_priv), cotable_acc_size);
557}
558
559/**
560 * vmw_cotable_alloc - Create a cotable resource
561 *
562 * @dev_priv: Pointer to a device private struct.
563 * @ctx: Pointer to the context resource.
564 * The cotable resource will not add a refcount.
565 * @type: The cotable type.
566 */
567struct vmw_resource *vmw_cotable_alloc(struct vmw_private *dev_priv,
568 struct vmw_resource *ctx,
569 u32 type)
570{
571 struct vmw_cotable *vcotbl;
572 struct ttm_operation_ctx ttm_opt_ctx = {
573 .interruptible = true,
574 .no_wait_gpu = false
575 };
576 int ret;
577 u32 num_entries;
578
579 if (unlikely(cotable_acc_size == 0))
580 cotable_acc_size = ttm_round_pot(sizeof(struct vmw_cotable));
581
582 ret = ttm_mem_global_alloc(vmw_mem_glob(dev_priv),
583 cotable_acc_size, &ttm_opt_ctx);
584 if (unlikely(ret))
585 return ERR_PTR(ret);
586
587 vcotbl = kzalloc(sizeof(*vcotbl), GFP_KERNEL);
588 if (unlikely(!vcotbl)) {
589 ret = -ENOMEM;
590 goto out_no_alloc;
591 }
592
593 ret = vmw_resource_init(dev_priv, &vcotbl->res, true,
594 vmw_cotable_free, &vmw_cotable_func);
595 if (unlikely(ret != 0))
596 goto out_no_init;
597
598 INIT_LIST_HEAD(&vcotbl->resource_list);
599 vcotbl->res.id = type;
600 vcotbl->res.backup_size = PAGE_SIZE;
601 num_entries = PAGE_SIZE / co_info[type].size;
602 if (num_entries < co_info[type].min_initial_entries) {
603 vcotbl->res.backup_size = co_info[type].min_initial_entries *
604 co_info[type].size;
605 vcotbl->res.backup_size =
606 (vcotbl->res.backup_size + PAGE_SIZE - 1) & PAGE_MASK;
607 }
608
609 vcotbl->scrubbed = true;
610 vcotbl->seen_entries = -1;
611 vcotbl->type = type;
612 vcotbl->ctx = ctx;
613
614 vcotbl->res.hw_destroy = vmw_hw_cotable_destroy;
615
616 return &vcotbl->res;
617
618out_no_init:
619 kfree(vcotbl);
620out_no_alloc:
621 ttm_mem_global_free(vmw_mem_glob(dev_priv), cotable_acc_size);
622 return ERR_PTR(ret);
623}
624
625/**
626 * vmw_cotable_notify - Notify the cotable about an item creation
627 *
628 * @res: Pointer to a cotable resource.
629 * @id: Item id.
630 */
631int vmw_cotable_notify(struct vmw_resource *res, int id)
632{
633 struct vmw_cotable *vcotbl = vmw_cotable(res);
634
635 if (id < 0 || id >= SVGA_COTABLE_MAX_IDS) {
636 DRM_ERROR("Illegal COTable id. Type is %u. Id is %d\n",
637 (unsigned) vcotbl->type, id);
638 return -EINVAL;
639 }
640
641 if (vcotbl->seen_entries < id) {
642 /* Trigger a call to create() on next validate */
643 res->id = -1;
644 vcotbl->seen_entries = id;
645 }
646
647 return 0;
648}
649
650/**
651 * vmw_cotable_add_view - add a view to the cotable's list of active views.
652 *
653 * @res: pointer struct vmw_resource representing the cotable.
654 * @head: pointer to the struct list_head member of the resource, dedicated
655 * to the cotable active resource list.
656 */
657void vmw_cotable_add_resource(struct vmw_resource *res, struct list_head *head)
658{
659 struct vmw_cotable *vcotbl =
660 container_of(res, struct vmw_cotable, res);
661
662 list_add_tail(head, &vcotbl->resource_list);
663}