drivers/gpu/drm/vmwgfx/vmwgfx_cotable.c

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