drivers/gpu/drm/vmwgfx/vmwgfx_resource.c

   1 /**************************************************************************
   2  *
   3  * Copyright © 2009 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 #include "vmwgfx_drv.h"
  29 #include <drm/vmwgfx_drm.h>
  30 #include <drm/ttm/ttm_object.h>
  31 #include <drm/ttm/ttm_placement.h>
  32 #include <drm/drmP.h>
  33 #include "vmwgfx_resource_priv.h"
  34
  35 #define VMW_RES_EVICT_ERR_COUNT 10
  36
  37 struct vmw_user_dma_buffer {
  38         struct ttm_prime_object prime;
  39         struct vmw_dma_buffer dma;
  40 };
  41
  42 struct vmw_bo_user_rep {
  43         uint32_t handle;
  44         uint64_t map_handle;
  45 };
  46
  47 struct vmw_stream {
  48         struct vmw_resource res;
  49         uint32_t stream_id;
  50 };
  51
  52 struct vmw_user_stream {
  53         struct ttm_base_object base;
  54         struct vmw_stream stream;
  55 };
  56
  57
  58 static uint64_t vmw_user_stream_size;
  59
  60 static const struct vmw_res_func vmw_stream_func = {
  61         .res_type = vmw_res_stream,
  62         .needs_backup = false,
  63         .may_evict = false,
  64         .type_name = "video streams",
  65         .backup_placement = NULL,
  66         .create = NULL,
  67         .destroy = NULL,
  68         .bind = NULL,
  69         .unbind = NULL
  70 };
  71
  72 static inline struct vmw_dma_buffer *
  73 vmw_dma_buffer(struct ttm_buffer_object *bo)
  74 {
  75         return container_of(bo, struct vmw_dma_buffer, base);
  76 }
  77
  78 static inline struct vmw_user_dma_buffer *
  79 vmw_user_dma_buffer(struct ttm_buffer_object *bo)
  80 {
  81         struct vmw_dma_buffer *vmw_bo = vmw_dma_buffer(bo);
  82         return container_of(vmw_bo, struct vmw_user_dma_buffer, dma);
  83 }
  84
  85 struct vmw_resource *vmw_resource_reference(struct vmw_resource *res)
  86 {
  87         kref_get(&res->kref);
  88         return res;
  89 }
  90
  91
  92 /**
  93  * vmw_resource_release_id - release a resource id to the id manager.
  94  *
  95  * @res: Pointer to the resource.
  96  *
  97  * Release the resource id to the resource id manager and set it to -1
  98  */
  99 void vmw_resource_release_id(struct vmw_resource *res)
 100 {
 101         struct vmw_private *dev_priv = res->dev_priv;
 102         struct idr *idr = &dev_priv->res_idr[res->func->res_type];
 103
 104         write_lock(&dev_priv->resource_lock);
 105         if (res->id != -1)
 106                 idr_remove(idr, res->id);
 107         res->id = -1;
 108         write_unlock(&dev_priv->resource_lock);
 109 }
 110
 111 static void vmw_resource_release(struct kref *kref)
 112 {
 113         struct vmw_resource *res =
 114             container_of(kref, struct vmw_resource, kref);
 115         struct vmw_private *dev_priv = res->dev_priv;
 116         int id;
 117         struct idr *idr = &dev_priv->res_idr[res->func->res_type];
 118
 119         res->avail = false;
 120         list_del_init(&res->lru_head);
 121         write_unlock(&dev_priv->resource_lock);
 122         if (res->backup) {
 123                 struct ttm_buffer_object *bo = &res->backup->base;
 124
 125                 ttm_bo_reserve(bo, false, false, false, 0);
 126                 if (!list_empty(&res->mob_head) &&
 127                     res->func->unbind != NULL) {
 128                         struct ttm_validate_buffer val_buf;
 129
 130                         val_buf.bo = bo;
 131                         res->func->unbind(res, false, &val_buf);
 132                 }
 133                 res->backup_dirty = false;
 134                 list_del_init(&res->mob_head);
 135                 ttm_bo_unreserve(bo);
 136                 vmw_dmabuf_unreference(&res->backup);
 137         }
 138
 139         if (likely(res->hw_destroy != NULL))
 140                 res->hw_destroy(res);
 141
 142         id = res->id;
 143         if (res->res_free != NULL)
 144                 res->res_free(res);
 145         else
 146                 kfree(res);
 147
 148         write_lock(&dev_priv->resource_lock);
 149
 150         if (id != -1)
 151                 idr_remove(idr, id);
 152 }
 153
 154 void vmw_resource_unreference(struct vmw_resource **p_res)
 155 {
 156         struct vmw_resource *res = *p_res;
 157         struct vmw_private *dev_priv = res->dev_priv;
 158
 159         *p_res = NULL;
 160         write_lock(&dev_priv->resource_lock);
 161         kref_put(&res->kref, vmw_resource_release);
 162         write_unlock(&dev_priv->resource_lock);
 163 }
 164
 165
 166 /**
 167  * vmw_resource_alloc_id - release a resource id to the id manager.
 168  *
 169  * @res: Pointer to the resource.
 170  *
 171  * Allocate the lowest free resource from the resource manager, and set
 172  * @res->id to that id. Returns 0 on success and -ENOMEM on failure.
 173  */
 174 int vmw_resource_alloc_id(struct vmw_resource *res)
 175 {
 176         struct vmw_private *dev_priv = res->dev_priv;
 177         int ret;
 178         struct idr *idr = &dev_priv->res_idr[res->func->res_type];
 179
 180         BUG_ON(res->id != -1);
 181
 182         idr_preload(GFP_KERNEL);
 183         write_lock(&dev_priv->resource_lock);
 184
 185         ret = idr_alloc(idr, res, 1, 0, GFP_NOWAIT);
 186         if (ret >= 0)
 187                 res->id = ret;
 188
 189         write_unlock(&dev_priv->resource_lock);
 190         idr_preload_end();
 191         return ret < 0 ? ret : 0;
 192 }
 193
 194 /**
 195  * vmw_resource_init - initialize a struct vmw_resource
 196  *
 197  * @dev_priv:       Pointer to a device private struct.
 198  * @res:            The struct vmw_resource to initialize.
 199  * @obj_type:       Resource object type.
 200  * @delay_id:       Boolean whether to defer device id allocation until
 201  *                  the first validation.
 202  * @res_free:       Resource destructor.
 203  * @func:           Resource function table.
 204  */
 205 int vmw_resource_init(struct vmw_private *dev_priv, struct vmw_resource *res,
 206                       bool delay_id,
 207                       void (*res_free) (struct vmw_resource *res),
 208                       const struct vmw_res_func *func)
 209 {
 210         kref_init(&res->kref);
 211         res->hw_destroy = NULL;
 212         res->res_free = res_free;
 213         res->avail = false;
 214         res->dev_priv = dev_priv;
 215         res->func = func;
 216         INIT_LIST_HEAD(&res->lru_head);
 217         INIT_LIST_HEAD(&res->mob_head);
 218         res->id = -1;
 219         res->backup = NULL;
 220         res->backup_offset = 0;
 221         res->backup_dirty = false;
 222         res->res_dirty = false;
 223         if (delay_id)
 224                 return 0;
 225         else
 226                 return vmw_resource_alloc_id(res);
 227 }
 228
 229 /**
 230  * vmw_resource_activate
 231  *
 232  * @res:        Pointer to the newly created resource
 233  * @hw_destroy: Destroy function. NULL if none.
 234  *
 235  * Activate a resource after the hardware has been made aware of it.
 236  * Set tye destroy function to @destroy. Typically this frees the
 237  * resource and destroys the hardware resources associated with it.
 238  * Activate basically means that the function vmw_resource_lookup will
 239  * find it.
 240  */
 241 void vmw_resource_activate(struct vmw_resource *res,
 242                            void (*hw_destroy) (struct vmw_resource *))
 243 {
 244         struct vmw_private *dev_priv = res->dev_priv;
 245
 246         write_lock(&dev_priv->resource_lock);
 247         res->avail = true;
 248         res->hw_destroy = hw_destroy;
 249         write_unlock(&dev_priv->resource_lock);
 250 }
 251
 252 struct vmw_resource *vmw_resource_lookup(struct vmw_private *dev_priv,
 253                                          struct idr *idr, int id)
 254 {
 255         struct vmw_resource *res;
 256
 257         read_lock(&dev_priv->resource_lock);
 258         res = idr_find(idr, id);
 259         if (res && res->avail)
 260                 kref_get(&res->kref);
 261         else
 262                 res = NULL;
 263         read_unlock(&dev_priv->resource_lock);
 264
 265         if (unlikely(res == NULL))
 266                 return NULL;
 267
 268         return res;
 269 }
 270
 271 /**
 272  * vmw_user_resource_lookup_handle - lookup a struct resource from a
 273  * TTM user-space handle and perform basic type checks
 274  *
 275  * @dev_priv:     Pointer to a device private struct
 276  * @tfile:        Pointer to a struct ttm_object_file identifying the caller
 277  * @handle:       The TTM user-space handle
 278  * @converter:    Pointer to an object describing the resource type
 279  * @p_res:        On successful return the location pointed to will contain
 280  *                a pointer to a refcounted struct vmw_resource.
 281  *
 282  * If the handle can't be found or is associated with an incorrect resource
 283  * type, -EINVAL will be returned.
 284  */
 285 int vmw_user_resource_lookup_handle(struct vmw_private *dev_priv,
 286                                     struct ttm_object_file *tfile,
 287                                     uint32_t handle,
 288                                     const struct vmw_user_resource_conv
 289                                     *converter,
 290                                     struct vmw_resource **p_res)
 291 {
 292         struct ttm_base_object *base;
 293         struct vmw_resource *res;
 294         int ret = -EINVAL;
 295
 296         base = ttm_base_object_lookup(tfile, handle);
 297         if (unlikely(base == NULL))
 298                 return -EINVAL;
 299
 300         if (unlikely(ttm_base_object_type(base) != converter->object_type))
 301                 goto out_bad_resource;
 302
 303         res = converter->base_obj_to_res(base);
 304
 305         read_lock(&dev_priv->resource_lock);
 306         if (!res->avail || res->res_free != converter->res_free) {
 307                 read_unlock(&dev_priv->resource_lock);
 308                 goto out_bad_resource;
 309         }
 310
 311         kref_get(&res->kref);
 312         read_unlock(&dev_priv->resource_lock);
 313
 314         *p_res = res;
 315         ret = 0;
 316
 317 out_bad_resource:
 318         ttm_base_object_unref(&base);
 319
 320         return ret;
 321 }
 322
 323 /**
 324  * Helper function that looks either a surface or dmabuf.
 325  *
 326  * The pointer this pointed at by out_surf and out_buf needs to be null.
 327  */
 328 int vmw_user_lookup_handle(struct vmw_private *dev_priv,
 329                            struct ttm_object_file *tfile,
 330                            uint32_t handle,
 331                            struct vmw_surface **out_surf,
 332                            struct vmw_dma_buffer **out_buf)
 333 {
 334         struct vmw_resource *res;
 335         int ret;
 336
 337         BUG_ON(*out_surf || *out_buf);
 338
 339         ret = vmw_user_resource_lookup_handle(dev_priv, tfile, handle,
 340                                               user_surface_converter,
 341                                               &res);
 342         if (!ret) {
 343                 *out_surf = vmw_res_to_srf(res);
 344                 return 0;
 345         }
 346
 347         *out_surf = NULL;
 348         ret = vmw_user_dmabuf_lookup(tfile, handle, out_buf);
 349         return ret;
 350 }
 351
 352 /**
 353  * Buffer management.
 354  */
 355
 356 /**
 357  * vmw_dmabuf_acc_size - Calculate the pinned memory usage of buffers
 358  *
 359  * @dev_priv: Pointer to a struct vmw_private identifying the device.
 360  * @size: The requested buffer size.
 361  * @user: Whether this is an ordinary dma buffer or a user dma buffer.
 362  */
 363 static size_t vmw_dmabuf_acc_size(struct vmw_private *dev_priv, size_t size,
 364                                   bool user)
 365 {
 366         static size_t struct_size, user_struct_size;
 367         size_t num_pages = PAGE_ALIGN(size) >> PAGE_SHIFT;
 368         size_t page_array_size = ttm_round_pot(num_pages * sizeof(void *));
 369
 370         if (unlikely(struct_size == 0)) {
 371                 size_t backend_size = ttm_round_pot(vmw_tt_size);
 372
 373                 struct_size = backend_size +
 374                         ttm_round_pot(sizeof(struct vmw_dma_buffer));
 375                 user_struct_size = backend_size +
 376                         ttm_round_pot(sizeof(struct vmw_user_dma_buffer));
 377         }
 378
 379         if (dev_priv->map_mode == vmw_dma_alloc_coherent)
 380                 page_array_size +=
 381                         ttm_round_pot(num_pages * sizeof(dma_addr_t));
 382
 383         return ((user) ? user_struct_size : struct_size) +
 384                 page_array_size;
 385 }
 386
 387 void vmw_dmabuf_bo_free(struct ttm_buffer_object *bo)
 388 {
 389         struct vmw_dma_buffer *vmw_bo = vmw_dma_buffer(bo);
 390
 391         kfree(vmw_bo);
 392 }
 393
 394 static void vmw_user_dmabuf_destroy(struct ttm_buffer_object *bo)
 395 {
 396         struct vmw_user_dma_buffer *vmw_user_bo = vmw_user_dma_buffer(bo);
 397
 398         ttm_prime_object_kfree(vmw_user_bo, prime);
 399 }
 400
 401 int vmw_dmabuf_init(struct vmw_private *dev_priv,
 402                     struct vmw_dma_buffer *vmw_bo,
 403                     size_t size, struct ttm_placement *placement,
 404                     bool interruptible,
 405                     void (*bo_free) (struct ttm_buffer_object *bo))
 406 {
 407         struct ttm_bo_device *bdev = &dev_priv->bdev;
 408         size_t acc_size;
 409         int ret;
 410         bool user = (bo_free == &vmw_user_dmabuf_destroy);
 411
 412         BUG_ON(!bo_free && (!user && (bo_free != vmw_dmabuf_bo_free)));
 413
 414         acc_size = vmw_dmabuf_acc_size(dev_priv, size, user);
 415         memset(vmw_bo, 0, sizeof(*vmw_bo));
 416
 417         INIT_LIST_HEAD(&vmw_bo->res_list);
 418
 419         ret = ttm_bo_init(bdev, &vmw_bo->base, size,
 420                           (user) ? ttm_bo_type_device :
 421                           ttm_bo_type_kernel, placement,
 422                           0, interruptible,
 423                           NULL, acc_size, NULL, bo_free);
 424         return ret;
 425 }
 426
 427 static void vmw_user_dmabuf_release(struct ttm_base_object **p_base)
 428 {
 429         struct vmw_user_dma_buffer *vmw_user_bo;
 430         struct ttm_base_object *base = *p_base;
 431         struct ttm_buffer_object *bo;
 432
 433         *p_base = NULL;
 434
 435         if (unlikely(base == NULL))
 436                 return;
 437
 438         vmw_user_bo = container_of(base, struct vmw_user_dma_buffer,
 439                                    prime.base);
 440         bo = &vmw_user_bo->dma.base;
 441         ttm_bo_unref(&bo);
 442 }
 443
 444 /**
 445  * vmw_user_dmabuf_alloc - Allocate a user dma buffer
 446  *
 447  * @dev_priv: Pointer to a struct device private.
 448  * @tfile: Pointer to a struct ttm_object_file on which to register the user
 449  * object.
 450  * @size: Size of the dma buffer.
 451  * @shareable: Boolean whether the buffer is shareable with other open files.
 452  * @handle: Pointer to where the handle value should be assigned.
 453  * @p_dma_buf: Pointer to where the refcounted struct vmw_dma_buffer pointer
 454  * should be assigned.
 455  */
 456 int vmw_user_dmabuf_alloc(struct vmw_private *dev_priv,
 457                           struct ttm_object_file *tfile,
 458                           uint32_t size,
 459                           bool shareable,
 460                           uint32_t *handle,
 461                           struct vmw_dma_buffer **p_dma_buf)
 462 {
 463         struct vmw_user_dma_buffer *user_bo;
 464         struct ttm_buffer_object *tmp;
 465         int ret;
 466
 467         user_bo = kzalloc(sizeof(*user_bo), GFP_KERNEL);
 468         if (unlikely(user_bo == NULL)) {
 469                 DRM_ERROR("Failed to allocate a buffer.\n");
 470                 return -ENOMEM;
 471         }
 472
 473         ret = vmw_dmabuf_init(dev_priv, &user_bo->dma, size,
 474                               &vmw_vram_sys_placement, true,
 475                               &vmw_user_dmabuf_destroy);
 476         if (unlikely(ret != 0))
 477                 return ret;
 478
 479         tmp = ttm_bo_reference(&user_bo->dma.base);
 480         ret = ttm_prime_object_init(tfile,
 481                                     size,
 482                                     &user_bo->prime,
 483                                     shareable,
 484                                     ttm_buffer_type,
 485                                     &vmw_user_dmabuf_release, NULL);
 486         if (unlikely(ret != 0)) {
 487                 ttm_bo_unref(&tmp);
 488                 goto out_no_base_object;
 489         }
 490
 491         *p_dma_buf = &user_bo->dma;
 492         *handle = user_bo->prime.base.hash.key;
 493
 494 out_no_base_object:
 495         return ret;
 496 }
 497
 498 /**
 499  * vmw_user_dmabuf_verify_access - verify access permissions on this
 500  * buffer object.
 501  *
 502  * @bo: Pointer to the buffer object being accessed
 503  * @tfile: Identifying the caller.
 504  */
 505 int vmw_user_dmabuf_verify_access(struct ttm_buffer_object *bo,
 506                                   struct ttm_object_file *tfile)
 507 {
 508         struct vmw_user_dma_buffer *vmw_user_bo;
 509
 510         if (unlikely(bo->destroy != vmw_user_dmabuf_destroy))
 511                 return -EPERM;
 512
 513         vmw_user_bo = vmw_user_dma_buffer(bo);
 514         return (vmw_user_bo->prime.base.tfile == tfile ||
 515                 vmw_user_bo->prime.base.shareable) ? 0 : -EPERM;
 516 }
 517
 518 int vmw_dmabuf_alloc_ioctl(struct drm_device *dev, void *data,
 519                            struct drm_file *file_priv)
 520 {
 521         struct vmw_private *dev_priv = vmw_priv(dev);
 522         union drm_vmw_alloc_dmabuf_arg *arg =
 523             (union drm_vmw_alloc_dmabuf_arg *)data;
 524         struct drm_vmw_alloc_dmabuf_req *req = &arg->req;
 525         struct drm_vmw_dmabuf_rep *rep = &arg->rep;
 526         struct vmw_dma_buffer *dma_buf;
 527         uint32_t handle;
 528         struct vmw_master *vmaster = vmw_master(file_priv->master);
 529         int ret;
 530
 531         ret = ttm_read_lock(&vmaster->lock, true);
 532         if (unlikely(ret != 0))
 533                 return ret;
 534
 535         ret = vmw_user_dmabuf_alloc(dev_priv, vmw_fpriv(file_priv)->tfile,
 536                                     req->size, false, &handle, &dma_buf);
 537         if (unlikely(ret != 0))
 538                 goto out_no_dmabuf;
 539
 540         rep->handle = handle;
 541         rep->map_handle = drm_vma_node_offset_addr(&dma_buf->base.vma_node);
 542         rep->cur_gmr_id = handle;
 543         rep->cur_gmr_offset = 0;
 544
 545         vmw_dmabuf_unreference(&dma_buf);
 546
 547 out_no_dmabuf:
 548         ttm_read_unlock(&vmaster->lock);
 549
 550         return ret;
 551 }
 552
 553 int vmw_dmabuf_unref_ioctl(struct drm_device *dev, void *data,
 554                            struct drm_file *file_priv)
 555 {
 556         struct drm_vmw_unref_dmabuf_arg *arg =
 557             (struct drm_vmw_unref_dmabuf_arg *)data;
 558
 559         return ttm_ref_object_base_unref(vmw_fpriv(file_priv)->tfile,
 560                                          arg->handle,
 561                                          TTM_REF_USAGE);
 562 }
 563
 564 int vmw_user_dmabuf_lookup(struct ttm_object_file *tfile,
 565                            uint32_t handle, struct vmw_dma_buffer **out)
 566 {
 567         struct vmw_user_dma_buffer *vmw_user_bo;
 568         struct ttm_base_object *base;
 569
 570         base = ttm_base_object_lookup(tfile, handle);
 571         if (unlikely(base == NULL)) {
 572                 printk(KERN_ERR "Invalid buffer object handle 0x%08lx.\n",
 573                        (unsigned long)handle);
 574                 return -ESRCH;
 575         }
 576
 577         if (unlikely(ttm_base_object_type(base) != ttm_buffer_type)) {
 578                 ttm_base_object_unref(&base);
 579                 printk(KERN_ERR "Invalid buffer object handle 0x%08lx.\n",
 580                        (unsigned long)handle);
 581                 return -EINVAL;
 582         }
 583
 584         vmw_user_bo = container_of(base, struct vmw_user_dma_buffer,
 585                                    prime.base);
 586         (void)ttm_bo_reference(&vmw_user_bo->dma.base);
 587         ttm_base_object_unref(&base);
 588         *out = &vmw_user_bo->dma;
 589
 590         return 0;
 591 }
 592
 593 int vmw_user_dmabuf_reference(struct ttm_object_file *tfile,
 594                               struct vmw_dma_buffer *dma_buf)
 595 {
 596         struct vmw_user_dma_buffer *user_bo;
 597
 598         if (dma_buf->base.destroy != vmw_user_dmabuf_destroy)
 599                 return -EINVAL;
 600
 601         user_bo = container_of(dma_buf, struct vmw_user_dma_buffer, dma);
 602         return ttm_ref_object_add(tfile, &user_bo->prime.base,
 603                                   TTM_REF_USAGE, NULL);
 604 }
 605
 606 /*
 607  * Stream management
 608  */
 609
 610 static void vmw_stream_destroy(struct vmw_resource *res)
 611 {
 612         struct vmw_private *dev_priv = res->dev_priv;
 613         struct vmw_stream *stream;
 614         int ret;
 615
 616         DRM_INFO("%s: unref\n", __func__);
 617         stream = container_of(res, struct vmw_stream, res);
 618
 619         ret = vmw_overlay_unref(dev_priv, stream->stream_id);
 620         WARN_ON(ret != 0);
 621 }
 622
 623 static int vmw_stream_init(struct vmw_private *dev_priv,
 624                            struct vmw_stream *stream,
 625                            void (*res_free) (struct vmw_resource *res))
 626 {
 627         struct vmw_resource *res = &stream->res;
 628         int ret;
 629
 630         ret = vmw_resource_init(dev_priv, res, false, res_free,
 631                                 &vmw_stream_func);
 632
 633         if (unlikely(ret != 0)) {
 634                 if (res_free == NULL)
 635                         kfree(stream);
 636                 else
 637                         res_free(&stream->res);
 638                 return ret;
 639         }
 640
 641         ret = vmw_overlay_claim(dev_priv, &stream->stream_id);
 642         if (ret) {
 643                 vmw_resource_unreference(&res);
 644                 return ret;
 645         }
 646
 647         DRM_INFO("%s: claimed\n", __func__);
 648
 649         vmw_resource_activate(&stream->res, vmw_stream_destroy);
 650         return 0;
 651 }
 652
 653 static void vmw_user_stream_free(struct vmw_resource *res)
 654 {
 655         struct vmw_user_stream *stream =
 656             container_of(res, struct vmw_user_stream, stream.res);
 657         struct vmw_private *dev_priv = res->dev_priv;
 658
 659         ttm_base_object_kfree(stream, base);
 660         ttm_mem_global_free(vmw_mem_glob(dev_priv),
 661                             vmw_user_stream_size);
 662 }
 663
 664 /**
 665  * This function is called when user space has no more references on the
 666  * base object. It releases the base-object's reference on the resource object.
 667  */
 668
 669 static void vmw_user_stream_base_release(struct ttm_base_object **p_base)
 670 {
 671         struct ttm_base_object *base = *p_base;
 672         struct vmw_user_stream *stream =
 673             container_of(base, struct vmw_user_stream, base);
 674         struct vmw_resource *res = &stream->stream.res;
 675
 676         *p_base = NULL;
 677         vmw_resource_unreference(&res);
 678 }
 679
 680 int vmw_stream_unref_ioctl(struct drm_device *dev, void *data,
 681                            struct drm_file *file_priv)
 682 {
 683         struct vmw_private *dev_priv = vmw_priv(dev);
 684         struct vmw_resource *res;
 685         struct vmw_user_stream *stream;
 686         struct drm_vmw_stream_arg *arg = (struct drm_vmw_stream_arg *)data;
 687         struct ttm_object_file *tfile = vmw_fpriv(file_priv)->tfile;
 688         struct idr *idr = &dev_priv->res_idr[vmw_res_stream];
 689         int ret = 0;
 690
 691
 692         res = vmw_resource_lookup(dev_priv, idr, arg->stream_id);
 693         if (unlikely(res == NULL))
 694                 return -EINVAL;
 695
 696         if (res->res_free != &vmw_user_stream_free) {
 697                 ret = -EINVAL;
 698                 goto out;
 699         }
 700
 701         stream = container_of(res, struct vmw_user_stream, stream.res);
 702         if (stream->base.tfile != tfile) {
 703                 ret = -EINVAL;
 704                 goto out;
 705         }
 706
 707         ttm_ref_object_base_unref(tfile, stream->base.hash.key, TTM_REF_USAGE);
 708 out:
 709         vmw_resource_unreference(&res);
 710         return ret;
 711 }
 712
 713 int vmw_stream_claim_ioctl(struct drm_device *dev, void *data,
 714                            struct drm_file *file_priv)
 715 {
 716         struct vmw_private *dev_priv = vmw_priv(dev);
 717         struct vmw_user_stream *stream;
 718         struct vmw_resource *res;
 719         struct vmw_resource *tmp;
 720         struct drm_vmw_stream_arg *arg = (struct drm_vmw_stream_arg *)data;
 721         struct ttm_object_file *tfile = vmw_fpriv(file_priv)->tfile;
 722         struct vmw_master *vmaster = vmw_master(file_priv->master);
 723         int ret;
 724
 725         /*
 726          * Approximate idr memory usage with 128 bytes. It will be limited
 727          * by maximum number_of streams anyway?
 728          */
 729
 730         if (unlikely(vmw_user_stream_size == 0))
 731                 vmw_user_stream_size = ttm_round_pot(sizeof(*stream)) + 128;
 732
 733         ret = ttm_read_lock(&vmaster->lock, true);
 734         if (unlikely(ret != 0))
 735                 return ret;
 736
 737         ret = ttm_mem_global_alloc(vmw_mem_glob(dev_priv),
 738                                    vmw_user_stream_size,
 739                                    false, true);
 740         if (unlikely(ret != 0)) {
 741                 if (ret != -ERESTARTSYS)
 742                         DRM_ERROR("Out of graphics memory for stream"
 743                                   " creation.\n");
 744                 goto out_unlock;
 745         }
 746
 747
 748         stream = kmalloc(sizeof(*stream), GFP_KERNEL);
 749         if (unlikely(stream == NULL)) {
 750                 ttm_mem_global_free(vmw_mem_glob(dev_priv),
 751                                     vmw_user_stream_size);
 752                 ret = -ENOMEM;
 753                 goto out_unlock;
 754         }
 755
 756         res = &stream->stream.res;
 757         stream->base.shareable = false;
 758         stream->base.tfile = NULL;
 759
 760         /*
 761          * From here on, the destructor takes over resource freeing.
 762          */
 763
 764         ret = vmw_stream_init(dev_priv, &stream->stream, vmw_user_stream_free);
 765         if (unlikely(ret != 0))
 766                 goto out_unlock;
 767
 768         tmp = vmw_resource_reference(res);
 769         ret = ttm_base_object_init(tfile, &stream->base, false, VMW_RES_STREAM,
 770                                    &vmw_user_stream_base_release, NULL);
 771
 772         if (unlikely(ret != 0)) {
 773                 vmw_resource_unreference(&tmp);
 774                 goto out_err;
 775         }
 776
 777         arg->stream_id = res->id;
 778 out_err:
 779         vmw_resource_unreference(&res);
 780 out_unlock:
 781         ttm_read_unlock(&vmaster->lock);
 782         return ret;
 783 }
 784
 785 int vmw_user_stream_lookup(struct vmw_private *dev_priv,
 786                            struct ttm_object_file *tfile,
 787                            uint32_t *inout_id, struct vmw_resource **out)
 788 {
 789         struct vmw_user_stream *stream;
 790         struct vmw_resource *res;
 791         int ret;
 792
 793         res = vmw_resource_lookup(dev_priv, &dev_priv->res_idr[vmw_res_stream],
 794                                   *inout_id);
 795         if (unlikely(res == NULL))
 796                 return -EINVAL;
 797
 798         if (res->res_free != &vmw_user_stream_free) {
 799                 ret = -EINVAL;
 800                 goto err_ref;
 801         }
 802
 803         stream = container_of(res, struct vmw_user_stream, stream.res);
 804         if (stream->base.tfile != tfile) {
 805                 ret = -EPERM;
 806                 goto err_ref;
 807         }
 808
 809         *inout_id = stream->stream.stream_id;
 810         *out = res;
 811         return 0;
 812 err_ref:
 813         vmw_resource_unreference(&res);
 814         return ret;
 815 }
 816
 817
 818 /**
 819  * vmw_dumb_create - Create a dumb kms buffer
 820  *
 821  * @file_priv: Pointer to a struct drm_file identifying the caller.
 822  * @dev: Pointer to the drm device.
 823  * @args: Pointer to a struct drm_mode_create_dumb structure
 824  *
 825  * This is a driver callback for the core drm create_dumb functionality.
 826  * Note that this is very similar to the vmw_dmabuf_alloc ioctl, except
 827  * that the arguments have a different format.
 828  */
 829 int vmw_dumb_create(struct drm_file *file_priv,
 830                     struct drm_device *dev,
 831                     struct drm_mode_create_dumb *args)
 832 {
 833         struct vmw_private *dev_priv = vmw_priv(dev);
 834         struct vmw_master *vmaster = vmw_master(file_priv->master);
 835         struct vmw_dma_buffer *dma_buf;
 836         int ret;
 837
 838         args->pitch = args->width * ((args->bpp + 7) / 8);
 839         args->size = args->pitch * args->height;
 840
 841         ret = ttm_read_lock(&vmaster->lock, true);
 842         if (unlikely(ret != 0))
 843                 return ret;
 844
 845         ret = vmw_user_dmabuf_alloc(dev_priv, vmw_fpriv(file_priv)->tfile,
 846                                     args->size, false, &args->handle,
 847                                     &dma_buf);
 848         if (unlikely(ret != 0))
 849                 goto out_no_dmabuf;
 850
 851         vmw_dmabuf_unreference(&dma_buf);
 852 out_no_dmabuf:
 853         ttm_read_unlock(&vmaster->lock);
 854         return ret;
 855 }
 856
 857 /**
 858  * vmw_dumb_map_offset - Return the address space offset of a dumb buffer
 859  *
 860  * @file_priv: Pointer to a struct drm_file identifying the caller.
 861  * @dev: Pointer to the drm device.
 862  * @handle: Handle identifying the dumb buffer.
 863  * @offset: The address space offset returned.
 864  *
 865  * This is a driver callback for the core drm dumb_map_offset functionality.
 866  */
 867 int vmw_dumb_map_offset(struct drm_file *file_priv,
 868                         struct drm_device *dev, uint32_t handle,
 869                         uint64_t *offset)
 870 {
 871         struct ttm_object_file *tfile = vmw_fpriv(file_priv)->tfile;
 872         struct vmw_dma_buffer *out_buf;
 873         int ret;
 874
 875         ret = vmw_user_dmabuf_lookup(tfile, handle, &out_buf);
 876         if (ret != 0)
 877                 return -EINVAL;
 878
 879         *offset = drm_vma_node_offset_addr(&out_buf->base.vma_node);
 880         vmw_dmabuf_unreference(&out_buf);
 881         return 0;
 882 }
 883
 884 /**
 885  * vmw_dumb_destroy - Destroy a dumb boffer
 886  *
 887  * @file_priv: Pointer to a struct drm_file identifying the caller.
 888  * @dev: Pointer to the drm device.
 889  * @handle: Handle identifying the dumb buffer.
 890  *
 891  * This is a driver callback for the core drm dumb_destroy functionality.
 892  */
 893 int vmw_dumb_destroy(struct drm_file *file_priv,
 894                      struct drm_device *dev,
 895                      uint32_t handle)
 896 {
 897         return ttm_ref_object_base_unref(vmw_fpriv(file_priv)->tfile,
 898                                          handle, TTM_REF_USAGE);
 899 }
 900
 901 /**
 902  * vmw_resource_buf_alloc - Allocate a backup buffer for a resource.
 903  *
 904  * @res:            The resource for which to allocate a backup buffer.
 905  * @interruptible:  Whether any sleeps during allocation should be
 906  *                  performed while interruptible.
 907  */
 908 static int vmw_resource_buf_alloc(struct vmw_resource *res,
 909                                   bool interruptible)
 910 {
 911         unsigned long size =
 912                 (res->backup_size + PAGE_SIZE - 1) & PAGE_MASK;
 913         struct vmw_dma_buffer *backup;
 914         int ret;
 915
 916         if (likely(res->backup)) {
 917                 BUG_ON(res->backup->base.num_pages * PAGE_SIZE < size);
 918                 return 0;
 919         }
 920
 921         backup = kzalloc(sizeof(*backup), GFP_KERNEL);
 922         if (unlikely(backup == NULL))
 923                 return -ENOMEM;
 924
 925         ret = vmw_dmabuf_init(res->dev_priv, backup, res->backup_size,
 926                               res->func->backup_placement,
 927                               interruptible,
 928                               &vmw_dmabuf_bo_free);
 929         if (unlikely(ret != 0))
 930                 goto out_no_dmabuf;
 931
 932         res->backup = backup;
 933
 934 out_no_dmabuf:
 935         return ret;
 936 }
 937
 938 /**
 939  * vmw_resource_do_validate - Make a resource up-to-date and visible
 940  *                            to the device.
 941  *
 942  * @res:            The resource to make visible to the device.
 943  * @val_buf:        Information about a buffer possibly
 944  *                  containing backup data if a bind operation is needed.
 945  *
 946  * On hardware resource shortage, this function returns -EBUSY and
 947  * should be retried once resources have been freed up.
 948  */
 949 static int vmw_resource_do_validate(struct vmw_resource *res,
 950                                     struct ttm_validate_buffer *val_buf)
 951 {
 952         int ret = 0;
 953         const struct vmw_res_func *func = res->func;
 954
 955         if (unlikely(res->id == -1)) {
 956                 ret = func->create(res);
 957                 if (unlikely(ret != 0))
 958                         return ret;
 959         }
 960
 961         if (func->bind &&
 962             ((func->needs_backup && list_empty(&res->mob_head) &&
 963               val_buf->bo != NULL) ||
 964              (!func->needs_backup && val_buf->bo != NULL))) {
 965                 ret = func->bind(res, val_buf);
 966                 if (unlikely(ret != 0))
 967                         goto out_bind_failed;
 968                 if (func->needs_backup)
 969                         list_add_tail(&res->mob_head, &res->backup->res_list);
 970         }
 971
 972         /*
 973          * Only do this on write operations, and move to
 974          * vmw_resource_unreserve if it can be called after
 975          * backup buffers have been unreserved. Otherwise
 976          * sort out locking.
 977          */
 978         res->res_dirty = true;
 979
 980         return 0;
 981
 982 out_bind_failed:
 983         func->destroy(res);
 984
 985         return ret;
 986 }
 987
 988 /**
 989  * vmw_resource_unreserve - Unreserve a resource previously reserved for
 990  * command submission.
 991  *
 992  * @res:               Pointer to the struct vmw_resource to unreserve.
 993  * @new_backup:        Pointer to new backup buffer if command submission
 994  *                     switched.
 995  * @new_backup_offset: New backup offset if @new_backup is !NULL.
 996  *
 997  * Currently unreserving a resource means putting it back on the device's
 998  * resource lru list, so that it can be evicted if necessary.
 999  */
1000 void vmw_resource_unreserve(struct vmw_resource *res,
1001                             struct vmw_dma_buffer *new_backup,
1002                             unsigned long new_backup_offset)
1003 {
1004         struct vmw_private *dev_priv = res->dev_priv;
1005
1006         if (!list_empty(&res->lru_head))
1007                 return;
1008
1009         if (new_backup && new_backup != res->backup) {
1010
1011                 if (res->backup) {
1012                         lockdep_assert_held(&res->backup->base.resv->lock.base);
1013                         list_del_init(&res->mob_head);
1014                         vmw_dmabuf_unreference(&res->backup);
1015                 }
1016
1017                 res->backup = vmw_dmabuf_reference(new_backup);
1018                 lockdep_assert_held(&new_backup->base.resv->lock.base);
1019                 list_add_tail(&res->mob_head, &new_backup->res_list);
1020         }
1021         if (new_backup)
1022                 res->backup_offset = new_backup_offset;
1023
1024         if (!res->func->may_evict || res->id == -1)
1025                 return;
1026
1027         write_lock(&dev_priv->resource_lock);
1028         list_add_tail(&res->lru_head,
1029                       &res->dev_priv->res_lru[res->func->res_type]);
1030         write_unlock(&dev_priv->resource_lock);
1031 }
1032
1033 /**
1034  * vmw_resource_check_buffer - Check whether a backup buffer is needed
1035  *                             for a resource and in that case, allocate
1036  *                             one, reserve and validate it.
1037  *
1038  * @res:            The resource for which to allocate a backup buffer.
1039  * @interruptible:  Whether any sleeps during allocation should be
1040  *                  performed while interruptible.
1041  * @val_buf:        On successful return contains data about the
1042  *                  reserved and validated backup buffer.
1043  */
1044 static int
1045 vmw_resource_check_buffer(struct vmw_resource *res,
1046                           bool interruptible,
1047                           struct ttm_validate_buffer *val_buf)
1048 {
1049         struct list_head val_list;
1050         bool backup_dirty = false;
1051         int ret;
1052
1053         if (unlikely(res->backup == NULL)) {
1054                 ret = vmw_resource_buf_alloc(res, interruptible);
1055                 if (unlikely(ret != 0))
1056                         return ret;
1057         }
1058
1059         INIT_LIST_HEAD(&val_list);
1060         val_buf->bo = ttm_bo_reference(&res->backup->base);
1061         list_add_tail(&val_buf->head, &val_list);
1062         ret = ttm_eu_reserve_buffers(NULL, &val_list);
1063         if (unlikely(ret != 0))
1064                 goto out_no_reserve;
1065
1066         if (res->func->needs_backup && list_empty(&res->mob_head))
1067                 return 0;
1068
1069         backup_dirty = res->backup_dirty;
1070         ret = ttm_bo_validate(&res->backup->base,
1071                               res->func->backup_placement,
1072                               true, false);
1073
1074         if (unlikely(ret != 0))
1075                 goto out_no_validate;
1076
1077         return 0;
1078
1079 out_no_validate:
1080         ttm_eu_backoff_reservation(NULL, &val_list);
1081 out_no_reserve:
1082         ttm_bo_unref(&val_buf->bo);
1083         if (backup_dirty)
1084                 vmw_dmabuf_unreference(&res->backup);
1085
1086         return ret;
1087 }
1088
1089 /**
1090  * vmw_resource_reserve - Reserve a resource for command submission
1091  *
1092  * @res:            The resource to reserve.
1093  *
1094  * This function takes the resource off the LRU list and make sure
1095  * a backup buffer is present for guest-backed resources. However,
1096  * the buffer may not be bound to the resource at this point.
1097  *
1098  */
1099 int vmw_resource_reserve(struct vmw_resource *res, bool no_backup)
1100 {
1101         struct vmw_private *dev_priv = res->dev_priv;
1102         int ret;
1103
1104         write_lock(&dev_priv->resource_lock);
1105         list_del_init(&res->lru_head);
1106         write_unlock(&dev_priv->resource_lock);
1107
1108         if (res->func->needs_backup && res->backup == NULL &&
1109             !no_backup) {
1110                 ret = vmw_resource_buf_alloc(res, true);
1111                 if (unlikely(ret != 0))
1112                         return ret;
1113         }
1114
1115         return 0;
1116 }
1117
1118 /**
1119  * vmw_resource_backoff_reservation - Unreserve and unreference a
1120  *                                    backup buffer
1121  *.
1122  * @val_buf:        Backup buffer information.
1123  */
1124 static void
1125 vmw_resource_backoff_reservation(struct ttm_validate_buffer *val_buf)
1126 {
1127         struct list_head val_list;
1128
1129         if (likely(val_buf->bo == NULL))
1130                 return;
1131
1132         INIT_LIST_HEAD(&val_list);
1133         list_add_tail(&val_buf->head, &val_list);
1134         ttm_eu_backoff_reservation(NULL, &val_list);
1135         ttm_bo_unref(&val_buf->bo);
1136 }
1137
1138 /**
1139  * vmw_resource_do_evict - Evict a resource, and transfer its data
1140  *                         to a backup buffer.
1141  *
1142  * @res:            The resource to evict.
1143  * @interruptible:  Whether to wait interruptible.
1144  */
1145 int vmw_resource_do_evict(struct vmw_resource *res, bool interruptible)
1146 {
1147         struct ttm_validate_buffer val_buf;
1148         const struct vmw_res_func *func = res->func;
1149         int ret;
1150
1151         BUG_ON(!func->may_evict);
1152
1153         val_buf.bo = NULL;
1154         ret = vmw_resource_check_buffer(res, interruptible, &val_buf);
1155         if (unlikely(ret != 0))
1156                 return ret;
1157
1158         if (unlikely(func->unbind != NULL &&
1159                      (!func->needs_backup || !list_empty(&res->mob_head)))) {
1160                 ret = func->unbind(res, res->res_dirty, &val_buf);
1161                 if (unlikely(ret != 0))
1162                         goto out_no_unbind;
1163                 list_del_init(&res->mob_head);
1164         }
1165         ret = func->destroy(res);
1166         res->backup_dirty = true;
1167         res->res_dirty = false;
1168 out_no_unbind:
1169         vmw_resource_backoff_reservation(&val_buf);
1170
1171         return ret;
1172 }
1173
1174
1175 /**
1176  * vmw_resource_validate - Make a resource up-to-date and visible
1177  *                         to the device.
1178  *
1179  * @res:            The resource to make visible to the device.
1180  *
1181  * On succesful return, any backup DMA buffer pointed to by @res->backup will
1182  * be reserved and validated.
1183  * On hardware resource shortage, this function will repeatedly evict
1184  * resources of the same type until the validation succeeds.
1185  */
1186 int vmw_resource_validate(struct vmw_resource *res)
1187 {
1188         int ret;
1189         struct vmw_resource *evict_res;
1190         struct vmw_private *dev_priv = res->dev_priv;
1191         struct list_head *lru_list = &dev_priv->res_lru[res->func->res_type];
1192         struct ttm_validate_buffer val_buf;
1193         unsigned err_count = 0;
1194
1195         if (likely(!res->func->may_evict))
1196                 return 0;
1197
1198         val_buf.bo = NULL;
1199         if (res->backup)
1200                 val_buf.bo = &res->backup->base;
1201         do {
1202                 ret = vmw_resource_do_validate(res, &val_buf);
1203                 if (likely(ret != -EBUSY))
1204                         break;
1205
1206                 write_lock(&dev_priv->resource_lock);
1207                 if (list_empty(lru_list) || !res->func->may_evict) {
1208                         DRM_ERROR("Out of device device resources "
1209                                   "for %s.\n", res->func->type_name);
1210                         ret = -EBUSY;
1211                         write_unlock(&dev_priv->resource_lock);
1212                         break;
1213                 }
1214
1215                 evict_res = vmw_resource_reference
1216                         (list_first_entry(lru_list, struct vmw_resource,
1217                                           lru_head));
1218                 list_del_init(&evict_res->lru_head);
1219
1220                 write_unlock(&dev_priv->resource_lock);
1221
1222                 ret = vmw_resource_do_evict(evict_res, true);
1223                 if (unlikely(ret != 0)) {
1224                         write_lock(&dev_priv->resource_lock);
1225                         list_add_tail(&evict_res->lru_head, lru_list);
1226                         write_unlock(&dev_priv->resource_lock);
1227                         if (ret == -ERESTARTSYS ||
1228                             ++err_count > VMW_RES_EVICT_ERR_COUNT) {
1229                                 vmw_resource_unreference(&evict_res);
1230                                 goto out_no_validate;
1231                         }
1232                 }
1233
1234                 vmw_resource_unreference(&evict_res);
1235         } while (1);
1236
1237         if (unlikely(ret != 0))
1238                 goto out_no_validate;
1239         else if (!res->func->needs_backup && res->backup) {
1240                 list_del_init(&res->mob_head);
1241                 vmw_dmabuf_unreference(&res->backup);
1242         }
1243
1244         return 0;
1245
1246 out_no_validate:
1247         return ret;
1248 }
1249
1250 /**
1251  * vmw_fence_single_bo - Utility function to fence a single TTM buffer
1252  *                       object without unreserving it.
1253  *
1254  * @bo:             Pointer to the struct ttm_buffer_object to fence.
1255  * @fence:          Pointer to the fence. If NULL, this function will
1256  *                  insert a fence into the command stream..
1257  *
1258  * Contrary to the ttm_eu version of this function, it takes only
1259  * a single buffer object instead of a list, and it also doesn't
1260  * unreserve the buffer object, which needs to be done separately.
1261  */
1262 void vmw_fence_single_bo(struct ttm_buffer_object *bo,
1263                          struct vmw_fence_obj *fence)
1264 {
1265         struct ttm_bo_device *bdev = bo->bdev;
1266         struct ttm_bo_driver *driver = bdev->driver;
1267         struct vmw_fence_obj *old_fence_obj;
1268         struct vmw_private *dev_priv =
1269                 container_of(bdev, struct vmw_private, bdev);
1270
1271         if (fence == NULL)
1272                 vmw_execbuf_fence_commands(NULL, dev_priv, &fence, NULL);
1273         else
1274                 driver->sync_obj_ref(fence);
1275
1276         spin_lock(&bdev->fence_lock);
1277
1278         old_fence_obj = bo->sync_obj;
1279         bo->sync_obj = fence;
1280
1281         spin_unlock(&bdev->fence_lock);
1282
1283         if (old_fence_obj)
1284                 vmw_fence_obj_unreference(&old_fence_obj);
1285 }
1286
1287 /**
1288  * vmw_resource_move_notify - TTM move_notify_callback
1289  *
1290  * @bo:             The TTM buffer object about to move.
1291  * @mem:            The truct ttm_mem_reg indicating to what memory
1292  *                  region the move is taking place.
1293  *
1294  * For now does nothing.
1295  */
1296 void vmw_resource_move_notify(struct ttm_buffer_object *bo,
1297                               struct ttm_mem_reg *mem)
1298 {
1299 }
1300
1301 /**
1302  * vmw_resource_needs_backup - Return whether a resource needs a backup buffer.
1303  *
1304  * @res:            The resource being queried.
1305  */
1306 bool vmw_resource_needs_backup(const struct vmw_resource *res)
1307 {
1308         return res->func->needs_backup;
1309 }
1310
1311 /**
1312  * vmw_resource_evict_type - Evict all resources of a specific type
1313  *
1314  * @dev_priv:       Pointer to a device private struct
1315  * @type:           The resource type to evict
1316  *
1317  * To avoid thrashing starvation or as part of the hibernation sequence,
1318  * try to evict all evictable resources of a specific type.
1319  */
1320 static void vmw_resource_evict_type(struct vmw_private *dev_priv,
1321                                     enum vmw_res_type type)
1322 {
1323         struct list_head *lru_list = &dev_priv->res_lru[type];
1324         struct vmw_resource *evict_res;
1325         unsigned err_count = 0;
1326         int ret;
1327
1328         do {
1329                 write_lock(&dev_priv->resource_lock);
1330
1331                 if (list_empty(lru_list))
1332                         goto out_unlock;
1333
1334                 evict_res = vmw_resource_reference(
1335                         list_first_entry(lru_list, struct vmw_resource,
1336                                          lru_head));
1337                 list_del_init(&evict_res->lru_head);
1338                 write_unlock(&dev_priv->resource_lock);
1339
1340                 ret = vmw_resource_do_evict(evict_res, false);
1341                 if (unlikely(ret != 0)) {
1342                         write_lock(&dev_priv->resource_lock);
1343                         list_add_tail(&evict_res->lru_head, lru_list);
1344                         write_unlock(&dev_priv->resource_lock);
1345                         if (++err_count > VMW_RES_EVICT_ERR_COUNT) {
1346                                 vmw_resource_unreference(&evict_res);
1347                                 return;
1348                         }
1349                 }
1350
1351                 vmw_resource_unreference(&evict_res);
1352         } while (1);
1353
1354 out_unlock:
1355         write_unlock(&dev_priv->resource_lock);
1356 }
1357
1358 /**
1359  * vmw_resource_evict_all - Evict all evictable resources
1360  *
1361  * @dev_priv:       Pointer to a device private struct
1362  *
1363  * To avoid thrashing starvation or as part of the hibernation sequence,
1364  * evict all evictable resources. In particular this means that all
1365  * guest-backed resources that are registered with the device are
1366  * evicted and the OTable becomes clean.
1367  */
1368 void vmw_resource_evict_all(struct vmw_private *dev_priv)
1369 {
1370         enum vmw_res_type type;
1371
1372         mutex_lock(&dev_priv->cmdbuf_mutex);
1373
1374         for (type = 0; type < vmw_res_max; ++type)
1375                 vmw_resource_evict_type(dev_priv, type);
1376
1377         mutex_unlock(&dev_priv->cmdbuf_mutex);
1378 }