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                               (dev_priv->has_mob) ?
 475                               &vmw_sys_placement :
 476                               &vmw_vram_sys_placement, true,
 477                               &vmw_user_dmabuf_destroy);
 478         if (unlikely(ret != 0))
 479                 return ret;
 480
 481         tmp = ttm_bo_reference(&user_bo->dma.base);
 482         ret = ttm_prime_object_init(tfile,
 483                                     size,
 484                                     &user_bo->prime,
 485                                     shareable,
 486                                     ttm_buffer_type,
 487                                     &vmw_user_dmabuf_release, NULL);
 488         if (unlikely(ret != 0)) {
 489                 ttm_bo_unref(&tmp);
 490                 goto out_no_base_object;
 491         }
 492
 493         *p_dma_buf = &user_bo->dma;
 494         *handle = user_bo->prime.base.hash.key;
 495
 496 out_no_base_object:
 497         return ret;
 498 }
 499
 500 /**
 501  * vmw_user_dmabuf_verify_access - verify access permissions on this
 502  * buffer object.
 503  *
 504  * @bo: Pointer to the buffer object being accessed
 505  * @tfile: Identifying the caller.
 506  */
 507 int vmw_user_dmabuf_verify_access(struct ttm_buffer_object *bo,
 508                                   struct ttm_object_file *tfile)
 509 {
 510         struct vmw_user_dma_buffer *vmw_user_bo;
 511
 512         if (unlikely(bo->destroy != vmw_user_dmabuf_destroy))
 513                 return -EPERM;
 514
 515         vmw_user_bo = vmw_user_dma_buffer(bo);
 516         return (vmw_user_bo->prime.base.tfile == tfile ||
 517                 vmw_user_bo->prime.base.shareable) ? 0 : -EPERM;
 518 }
 519
 520 int vmw_dmabuf_alloc_ioctl(struct drm_device *dev, void *data,
 521                            struct drm_file *file_priv)
 522 {
 523         struct vmw_private *dev_priv = vmw_priv(dev);
 524         union drm_vmw_alloc_dmabuf_arg *arg =
 525             (union drm_vmw_alloc_dmabuf_arg *)data;
 526         struct drm_vmw_alloc_dmabuf_req *req = &arg->req;
 527         struct drm_vmw_dmabuf_rep *rep = &arg->rep;
 528         struct vmw_dma_buffer *dma_buf;
 529         uint32_t handle;
 530         struct vmw_master *vmaster = vmw_master(file_priv->master);
 531         int ret;
 532
 533         ret = ttm_read_lock(&vmaster->lock, true);
 534         if (unlikely(ret != 0))
 535                 return ret;
 536
 537         ret = vmw_user_dmabuf_alloc(dev_priv, vmw_fpriv(file_priv)->tfile,
 538                                     req->size, false, &handle, &dma_buf);
 539         if (unlikely(ret != 0))
 540                 goto out_no_dmabuf;
 541
 542         rep->handle = handle;
 543         rep->map_handle = drm_vma_node_offset_addr(&dma_buf->base.vma_node);
 544         rep->cur_gmr_id = handle;
 545         rep->cur_gmr_offset = 0;
 546
 547         vmw_dmabuf_unreference(&dma_buf);
 548
 549 out_no_dmabuf:
 550         ttm_read_unlock(&vmaster->lock);
 551
 552         return ret;
 553 }
 554
 555 int vmw_dmabuf_unref_ioctl(struct drm_device *dev, void *data,
 556                            struct drm_file *file_priv)
 557 {
 558         struct drm_vmw_unref_dmabuf_arg *arg =
 559             (struct drm_vmw_unref_dmabuf_arg *)data;
 560
 561         return ttm_ref_object_base_unref(vmw_fpriv(file_priv)->tfile,
 562                                          arg->handle,
 563                                          TTM_REF_USAGE);
 564 }
 565
 566 int vmw_user_dmabuf_lookup(struct ttm_object_file *tfile,
 567                            uint32_t handle, struct vmw_dma_buffer **out)
 568 {
 569         struct vmw_user_dma_buffer *vmw_user_bo;
 570         struct ttm_base_object *base;
 571
 572         base = ttm_base_object_lookup(tfile, handle);
 573         if (unlikely(base == NULL)) {
 574                 printk(KERN_ERR "Invalid buffer object handle 0x%08lx.\n",
 575                        (unsigned long)handle);
 576                 return -ESRCH;
 577         }
 578
 579         if (unlikely(ttm_base_object_type(base) != ttm_buffer_type)) {
 580                 ttm_base_object_unref(&base);
 581                 printk(KERN_ERR "Invalid buffer object handle 0x%08lx.\n",
 582                        (unsigned long)handle);
 583                 return -EINVAL;
 584         }
 585
 586         vmw_user_bo = container_of(base, struct vmw_user_dma_buffer,
 587                                    prime.base);
 588         (void)ttm_bo_reference(&vmw_user_bo->dma.base);
 589         ttm_base_object_unref(&base);
 590         *out = &vmw_user_bo->dma;
 591
 592         return 0;
 593 }
 594
 595 int vmw_user_dmabuf_reference(struct ttm_object_file *tfile,
 596                               struct vmw_dma_buffer *dma_buf)
 597 {
 598         struct vmw_user_dma_buffer *user_bo;
 599
 600         if (dma_buf->base.destroy != vmw_user_dmabuf_destroy)
 601                 return -EINVAL;
 602
 603         user_bo = container_of(dma_buf, struct vmw_user_dma_buffer, dma);
 604         return ttm_ref_object_add(tfile, &user_bo->prime.base,
 605                                   TTM_REF_USAGE, NULL);
 606 }
 607
 608 /*
 609  * Stream management
 610  */
 611
 612 static void vmw_stream_destroy(struct vmw_resource *res)
 613 {
 614         struct vmw_private *dev_priv = res->dev_priv;
 615         struct vmw_stream *stream;
 616         int ret;
 617
 618         DRM_INFO("%s: unref\n", __func__);
 619         stream = container_of(res, struct vmw_stream, res);
 620
 621         ret = vmw_overlay_unref(dev_priv, stream->stream_id);
 622         WARN_ON(ret != 0);
 623 }
 624
 625 static int vmw_stream_init(struct vmw_private *dev_priv,
 626                            struct vmw_stream *stream,
 627                            void (*res_free) (struct vmw_resource *res))
 628 {
 629         struct vmw_resource *res = &stream->res;
 630         int ret;
 631
 632         ret = vmw_resource_init(dev_priv, res, false, res_free,
 633                                 &vmw_stream_func);
 634
 635         if (unlikely(ret != 0)) {
 636                 if (res_free == NULL)
 637                         kfree(stream);
 638                 else
 639                         res_free(&stream->res);
 640                 return ret;
 641         }
 642
 643         ret = vmw_overlay_claim(dev_priv, &stream->stream_id);
 644         if (ret) {
 645                 vmw_resource_unreference(&res);
 646                 return ret;
 647         }
 648
 649         DRM_INFO("%s: claimed\n", __func__);
 650
 651         vmw_resource_activate(&stream->res, vmw_stream_destroy);
 652         return 0;
 653 }
 654
 655 static void vmw_user_stream_free(struct vmw_resource *res)
 656 {
 657         struct vmw_user_stream *stream =
 658             container_of(res, struct vmw_user_stream, stream.res);
 659         struct vmw_private *dev_priv = res->dev_priv;
 660
 661         ttm_base_object_kfree(stream, base);
 662         ttm_mem_global_free(vmw_mem_glob(dev_priv),
 663                             vmw_user_stream_size);
 664 }
 665
 666 /**
 667  * This function is called when user space has no more references on the
 668  * base object. It releases the base-object's reference on the resource object.
 669  */
 670
 671 static void vmw_user_stream_base_release(struct ttm_base_object **p_base)
 672 {
 673         struct ttm_base_object *base = *p_base;
 674         struct vmw_user_stream *stream =
 675             container_of(base, struct vmw_user_stream, base);
 676         struct vmw_resource *res = &stream->stream.res;
 677
 678         *p_base = NULL;
 679         vmw_resource_unreference(&res);
 680 }
 681
 682 int vmw_stream_unref_ioctl(struct drm_device *dev, void *data,
 683                            struct drm_file *file_priv)
 684 {
 685         struct vmw_private *dev_priv = vmw_priv(dev);
 686         struct vmw_resource *res;
 687         struct vmw_user_stream *stream;
 688         struct drm_vmw_stream_arg *arg = (struct drm_vmw_stream_arg *)data;
 689         struct ttm_object_file *tfile = vmw_fpriv(file_priv)->tfile;
 690         struct idr *idr = &dev_priv->res_idr[vmw_res_stream];
 691         int ret = 0;
 692
 693
 694         res = vmw_resource_lookup(dev_priv, idr, arg->stream_id);
 695         if (unlikely(res == NULL))
 696                 return -EINVAL;
 697
 698         if (res->res_free != &vmw_user_stream_free) {
 699                 ret = -EINVAL;
 700                 goto out;
 701         }
 702
 703         stream = container_of(res, struct vmw_user_stream, stream.res);
 704         if (stream->base.tfile != tfile) {
 705                 ret = -EINVAL;
 706                 goto out;
 707         }
 708
 709         ttm_ref_object_base_unref(tfile, stream->base.hash.key, TTM_REF_USAGE);
 710 out:
 711         vmw_resource_unreference(&res);
 712         return ret;
 713 }
 714
 715 int vmw_stream_claim_ioctl(struct drm_device *dev, void *data,
 716                            struct drm_file *file_priv)
 717 {
 718         struct vmw_private *dev_priv = vmw_priv(dev);
 719         struct vmw_user_stream *stream;
 720         struct vmw_resource *res;
 721         struct vmw_resource *tmp;
 722         struct drm_vmw_stream_arg *arg = (struct drm_vmw_stream_arg *)data;
 723         struct ttm_object_file *tfile = vmw_fpriv(file_priv)->tfile;
 724         struct vmw_master *vmaster = vmw_master(file_priv->master);
 725         int ret;
 726
 727         /*
 728          * Approximate idr memory usage with 128 bytes. It will be limited
 729          * by maximum number_of streams anyway?
 730          */
 731
 732         if (unlikely(vmw_user_stream_size == 0))
 733                 vmw_user_stream_size = ttm_round_pot(sizeof(*stream)) + 128;
 734
 735         ret = ttm_read_lock(&vmaster->lock, true);
 736         if (unlikely(ret != 0))
 737                 return ret;
 738
 739         ret = ttm_mem_global_alloc(vmw_mem_glob(dev_priv),
 740                                    vmw_user_stream_size,
 741                                    false, true);
 742         if (unlikely(ret != 0)) {
 743                 if (ret != -ERESTARTSYS)
 744                         DRM_ERROR("Out of graphics memory for stream"
 745                                   " creation.\n");
 746                 goto out_unlock;
 747         }
 748
 749
 750         stream = kmalloc(sizeof(*stream), GFP_KERNEL);
 751         if (unlikely(stream == NULL)) {
 752                 ttm_mem_global_free(vmw_mem_glob(dev_priv),
 753                                     vmw_user_stream_size);
 754                 ret = -ENOMEM;
 755                 goto out_unlock;
 756         }
 757
 758         res = &stream->stream.res;
 759         stream->base.shareable = false;
 760         stream->base.tfile = NULL;
 761
 762         /*
 763          * From here on, the destructor takes over resource freeing.
 764          */
 765
 766         ret = vmw_stream_init(dev_priv, &stream->stream, vmw_user_stream_free);
 767         if (unlikely(ret != 0))
 768                 goto out_unlock;
 769
 770         tmp = vmw_resource_reference(res);
 771         ret = ttm_base_object_init(tfile, &stream->base, false, VMW_RES_STREAM,
 772                                    &vmw_user_stream_base_release, NULL);
 773
 774         if (unlikely(ret != 0)) {
 775                 vmw_resource_unreference(&tmp);
 776                 goto out_err;
 777         }
 778
 779         arg->stream_id = res->id;
 780 out_err:
 781         vmw_resource_unreference(&res);
 782 out_unlock:
 783         ttm_read_unlock(&vmaster->lock);
 784         return ret;
 785 }
 786
 787 int vmw_user_stream_lookup(struct vmw_private *dev_priv,
 788                            struct ttm_object_file *tfile,
 789                            uint32_t *inout_id, struct vmw_resource **out)
 790 {
 791         struct vmw_user_stream *stream;
 792         struct vmw_resource *res;
 793         int ret;
 794
 795         res = vmw_resource_lookup(dev_priv, &dev_priv->res_idr[vmw_res_stream],
 796                                   *inout_id);
 797         if (unlikely(res == NULL))
 798                 return -EINVAL;
 799
 800         if (res->res_free != &vmw_user_stream_free) {
 801                 ret = -EINVAL;
 802                 goto err_ref;
 803         }
 804
 805         stream = container_of(res, struct vmw_user_stream, stream.res);
 806         if (stream->base.tfile != tfile) {
 807                 ret = -EPERM;
 808                 goto err_ref;
 809         }
 810
 811         *inout_id = stream->stream.stream_id;
 812         *out = res;
 813         return 0;
 814 err_ref:
 815         vmw_resource_unreference(&res);
 816         return ret;
 817 }
 818
 819
 820 /**
 821  * vmw_dumb_create - Create a dumb kms buffer
 822  *
 823  * @file_priv: Pointer to a struct drm_file identifying the caller.
 824  * @dev: Pointer to the drm device.
 825  * @args: Pointer to a struct drm_mode_create_dumb structure
 826  *
 827  * This is a driver callback for the core drm create_dumb functionality.
 828  * Note that this is very similar to the vmw_dmabuf_alloc ioctl, except
 829  * that the arguments have a different format.
 830  */
 831 int vmw_dumb_create(struct drm_file *file_priv,
 832                     struct drm_device *dev,
 833                     struct drm_mode_create_dumb *args)
 834 {
 835         struct vmw_private *dev_priv = vmw_priv(dev);
 836         struct vmw_master *vmaster = vmw_master(file_priv->master);
 837         struct vmw_dma_buffer *dma_buf;
 838         int ret;
 839
 840         args->pitch = args->width * ((args->bpp + 7) / 8);
 841         args->size = args->pitch * args->height;
 842
 843         ret = ttm_read_lock(&vmaster->lock, true);
 844         if (unlikely(ret != 0))
 845                 return ret;
 846
 847         ret = vmw_user_dmabuf_alloc(dev_priv, vmw_fpriv(file_priv)->tfile,
 848                                     args->size, false, &args->handle,
 849                                     &dma_buf);
 850         if (unlikely(ret != 0))
 851                 goto out_no_dmabuf;
 852
 853         vmw_dmabuf_unreference(&dma_buf);
 854 out_no_dmabuf:
 855         ttm_read_unlock(&vmaster->lock);
 856         return ret;
 857 }
 858
 859 /**
 860  * vmw_dumb_map_offset - Return the address space offset of a dumb buffer
 861  *
 862  * @file_priv: Pointer to a struct drm_file identifying the caller.
 863  * @dev: Pointer to the drm device.
 864  * @handle: Handle identifying the dumb buffer.
 865  * @offset: The address space offset returned.
 866  *
 867  * This is a driver callback for the core drm dumb_map_offset functionality.
 868  */
 869 int vmw_dumb_map_offset(struct drm_file *file_priv,
 870                         struct drm_device *dev, uint32_t handle,
 871                         uint64_t *offset)
 872 {
 873         struct ttm_object_file *tfile = vmw_fpriv(file_priv)->tfile;
 874         struct vmw_dma_buffer *out_buf;
 875         int ret;
 876
 877         ret = vmw_user_dmabuf_lookup(tfile, handle, &out_buf);
 878         if (ret != 0)
 879                 return -EINVAL;
 880
 881         *offset = drm_vma_node_offset_addr(&out_buf->base.vma_node);
 882         vmw_dmabuf_unreference(&out_buf);
 883         return 0;
 884 }
 885
 886 /**
 887  * vmw_dumb_destroy - Destroy a dumb boffer
 888  *
 889  * @file_priv: Pointer to a struct drm_file identifying the caller.
 890  * @dev: Pointer to the drm device.
 891  * @handle: Handle identifying the dumb buffer.
 892  *
 893  * This is a driver callback for the core drm dumb_destroy functionality.
 894  */
 895 int vmw_dumb_destroy(struct drm_file *file_priv,
 896                      struct drm_device *dev,
 897                      uint32_t handle)
 898 {
 899         return ttm_ref_object_base_unref(vmw_fpriv(file_priv)->tfile,
 900                                          handle, TTM_REF_USAGE);
 901 }
 902
 903 /**
 904  * vmw_resource_buf_alloc - Allocate a backup buffer for a resource.
 905  *
 906  * @res:            The resource for which to allocate a backup buffer.
 907  * @interruptible:  Whether any sleeps during allocation should be
 908  *                  performed while interruptible.
 909  */
 910 static int vmw_resource_buf_alloc(struct vmw_resource *res,
 911                                   bool interruptible)
 912 {
 913         unsigned long size =
 914                 (res->backup_size + PAGE_SIZE - 1) & PAGE_MASK;
 915         struct vmw_dma_buffer *backup;
 916         int ret;
 917
 918         if (likely(res->backup)) {
 919                 BUG_ON(res->backup->base.num_pages * PAGE_SIZE < size);
 920                 return 0;
 921         }
 922
 923         backup = kzalloc(sizeof(*backup), GFP_KERNEL);
 924         if (unlikely(backup == NULL))
 925                 return -ENOMEM;
 926
 927         ret = vmw_dmabuf_init(res->dev_priv, backup, res->backup_size,
 928                               res->func->backup_placement,
 929                               interruptible,
 930                               &vmw_dmabuf_bo_free);
 931         if (unlikely(ret != 0))
 932                 goto out_no_dmabuf;
 933
 934         res->backup = backup;
 935
 936 out_no_dmabuf:
 937         return ret;
 938 }
 939
 940 /**
 941  * vmw_resource_do_validate - Make a resource up-to-date and visible
 942  *                            to the device.
 943  *
 944  * @res:            The resource to make visible to the device.
 945  * @val_buf:        Information about a buffer possibly
 946  *                  containing backup data if a bind operation is needed.
 947  *
 948  * On hardware resource shortage, this function returns -EBUSY and
 949  * should be retried once resources have been freed up.
 950  */
 951 static int vmw_resource_do_validate(struct vmw_resource *res,
 952                                     struct ttm_validate_buffer *val_buf)
 953 {
 954         int ret = 0;
 955         const struct vmw_res_func *func = res->func;
 956
 957         if (unlikely(res->id == -1)) {
 958                 ret = func->create(res);
 959                 if (unlikely(ret != 0))
 960                         return ret;
 961         }
 962
 963         if (func->bind &&
 964             ((func->needs_backup && list_empty(&res->mob_head) &&
 965               val_buf->bo != NULL) ||
 966              (!func->needs_backup && val_buf->bo != NULL))) {
 967                 ret = func->bind(res, val_buf);
 968                 if (unlikely(ret != 0))
 969                         goto out_bind_failed;
 970                 if (func->needs_backup)
 971                         list_add_tail(&res->mob_head, &res->backup->res_list);
 972         }
 973
 974         /*
 975          * Only do this on write operations, and move to
 976          * vmw_resource_unreserve if it can be called after
 977          * backup buffers have been unreserved. Otherwise
 978          * sort out locking.
 979          */
 980         res->res_dirty = true;
 981
 982         return 0;
 983
 984 out_bind_failed:
 985         func->destroy(res);
 986
 987         return ret;
 988 }
 989
 990 /**
 991  * vmw_resource_unreserve - Unreserve a resource previously reserved for
 992  * command submission.
 993  *
 994  * @res:               Pointer to the struct vmw_resource to unreserve.
 995  * @new_backup:        Pointer to new backup buffer if command submission
 996  *                     switched.
 997  * @new_backup_offset: New backup offset if @new_backup is !NULL.
 998  *
 999  * Currently unreserving a resource means putting it back on the device's
1000  * resource lru list, so that it can be evicted if necessary.
1001  */
1002 void vmw_resource_unreserve(struct vmw_resource *res,
1003                             struct vmw_dma_buffer *new_backup,
1004                             unsigned long new_backup_offset)
1005 {
1006         struct vmw_private *dev_priv = res->dev_priv;
1007
1008         if (!list_empty(&res->lru_head))
1009                 return;
1010
1011         if (new_backup && new_backup != res->backup) {
1012
1013                 if (res->backup) {
1014                         lockdep_assert_held(&res->backup->base.resv->lock.base);
1015                         list_del_init(&res->mob_head);
1016                         vmw_dmabuf_unreference(&res->backup);
1017                 }
1018
1019                 res->backup = vmw_dmabuf_reference(new_backup);
1020                 lockdep_assert_held(&new_backup->base.resv->lock.base);
1021                 list_add_tail(&res->mob_head, &new_backup->res_list);
1022         }
1023         if (new_backup)
1024                 res->backup_offset = new_backup_offset;
1025
1026         if (!res->func->may_evict || res->id == -1)
1027                 return;
1028
1029         write_lock(&dev_priv->resource_lock);
1030         list_add_tail(&res->lru_head,
1031                       &res->dev_priv->res_lru[res->func->res_type]);
1032         write_unlock(&dev_priv->resource_lock);
1033 }
1034
1035 /**
1036  * vmw_resource_check_buffer - Check whether a backup buffer is needed
1037  *                             for a resource and in that case, allocate
1038  *                             one, reserve and validate it.
1039  *
1040  * @res:            The resource for which to allocate a backup buffer.
1041  * @interruptible:  Whether any sleeps during allocation should be
1042  *                  performed while interruptible.
1043  * @val_buf:        On successful return contains data about the
1044  *                  reserved and validated backup buffer.
1045  */
1046 static int
1047 vmw_resource_check_buffer(struct vmw_resource *res,
1048                           bool interruptible,
1049                           struct ttm_validate_buffer *val_buf)
1050 {
1051         struct list_head val_list;
1052         bool backup_dirty = false;
1053         int ret;
1054
1055         if (unlikely(res->backup == NULL)) {
1056                 ret = vmw_resource_buf_alloc(res, interruptible);
1057                 if (unlikely(ret != 0))
1058                         return ret;
1059         }
1060
1061         INIT_LIST_HEAD(&val_list);
1062         val_buf->bo = ttm_bo_reference(&res->backup->base);
1063         list_add_tail(&val_buf->head, &val_list);
1064         ret = ttm_eu_reserve_buffers(NULL, &val_list);
1065         if (unlikely(ret != 0))
1066                 goto out_no_reserve;
1067
1068         if (res->func->needs_backup && list_empty(&res->mob_head))
1069                 return 0;
1070
1071         backup_dirty = res->backup_dirty;
1072         ret = ttm_bo_validate(&res->backup->base,
1073                               res->func->backup_placement,
1074                               true, false);
1075
1076         if (unlikely(ret != 0))
1077                 goto out_no_validate;
1078
1079         return 0;
1080
1081 out_no_validate:
1082         ttm_eu_backoff_reservation(NULL, &val_list);
1083 out_no_reserve:
1084         ttm_bo_unref(&val_buf->bo);
1085         if (backup_dirty)
1086                 vmw_dmabuf_unreference(&res->backup);
1087
1088         return ret;
1089 }
1090
1091 /**
1092  * vmw_resource_reserve - Reserve a resource for command submission
1093  *
1094  * @res:            The resource to reserve.
1095  *
1096  * This function takes the resource off the LRU list and make sure
1097  * a backup buffer is present for guest-backed resources. However,
1098  * the buffer may not be bound to the resource at this point.
1099  *
1100  */
1101 int vmw_resource_reserve(struct vmw_resource *res, bool no_backup)
1102 {
1103         struct vmw_private *dev_priv = res->dev_priv;
1104         int ret;
1105
1106         write_lock(&dev_priv->resource_lock);
1107         list_del_init(&res->lru_head);
1108         write_unlock(&dev_priv->resource_lock);
1109
1110         if (res->func->needs_backup && res->backup == NULL &&
1111             !no_backup) {
1112                 ret = vmw_resource_buf_alloc(res, true);
1113                 if (unlikely(ret != 0))
1114                         return ret;
1115         }
1116
1117         return 0;
1118 }
1119
1120 /**
1121  * vmw_resource_backoff_reservation - Unreserve and unreference a
1122  *                                    backup buffer
1123  *.
1124  * @val_buf:        Backup buffer information.
1125  */
1126 static void
1127 vmw_resource_backoff_reservation(struct ttm_validate_buffer *val_buf)
1128 {
1129         struct list_head val_list;
1130
1131         if (likely(val_buf->bo == NULL))
1132                 return;
1133
1134         INIT_LIST_HEAD(&val_list);
1135         list_add_tail(&val_buf->head, &val_list);
1136         ttm_eu_backoff_reservation(NULL, &val_list);
1137         ttm_bo_unref(&val_buf->bo);
1138 }
1139
1140 /**
1141  * vmw_resource_do_evict - Evict a resource, and transfer its data
1142  *                         to a backup buffer.
1143  *
1144  * @res:            The resource to evict.
1145  * @interruptible:  Whether to wait interruptible.
1146  */
1147 int vmw_resource_do_evict(struct vmw_resource *res, bool interruptible)
1148 {
1149         struct ttm_validate_buffer val_buf;
1150         const struct vmw_res_func *func = res->func;
1151         int ret;
1152
1153         BUG_ON(!func->may_evict);
1154
1155         val_buf.bo = NULL;
1156         ret = vmw_resource_check_buffer(res, interruptible, &val_buf);
1157         if (unlikely(ret != 0))
1158                 return ret;
1159
1160         if (unlikely(func->unbind != NULL &&
1161                      (!func->needs_backup || !list_empty(&res->mob_head)))) {
1162                 ret = func->unbind(res, res->res_dirty, &val_buf);
1163                 if (unlikely(ret != 0))
1164                         goto out_no_unbind;
1165                 list_del_init(&res->mob_head);
1166         }
1167         ret = func->destroy(res);
1168         res->backup_dirty = true;
1169         res->res_dirty = false;
1170 out_no_unbind:
1171         vmw_resource_backoff_reservation(&val_buf);
1172
1173         return ret;
1174 }
1175
1176
1177 /**
1178  * vmw_resource_validate - Make a resource up-to-date and visible
1179  *                         to the device.
1180  *
1181  * @res:            The resource to make visible to the device.
1182  *
1183  * On succesful return, any backup DMA buffer pointed to by @res->backup will
1184  * be reserved and validated.
1185  * On hardware resource shortage, this function will repeatedly evict
1186  * resources of the same type until the validation succeeds.
1187  */
1188 int vmw_resource_validate(struct vmw_resource *res)
1189 {
1190         int ret;
1191         struct vmw_resource *evict_res;
1192         struct vmw_private *dev_priv = res->dev_priv;
1193         struct list_head *lru_list = &dev_priv->res_lru[res->func->res_type];
1194         struct ttm_validate_buffer val_buf;
1195         unsigned err_count = 0;
1196
1197         if (likely(!res->func->may_evict))
1198                 return 0;
1199
1200         val_buf.bo = NULL;
1201         if (res->backup)
1202                 val_buf.bo = &res->backup->base;
1203         do {
1204                 ret = vmw_resource_do_validate(res, &val_buf);
1205                 if (likely(ret != -EBUSY))
1206                         break;
1207
1208                 write_lock(&dev_priv->resource_lock);
1209                 if (list_empty(lru_list) || !res->func->may_evict) {
1210                         DRM_ERROR("Out of device device resources "
1211                                   "for %s.\n", res->func->type_name);
1212                         ret = -EBUSY;
1213                         write_unlock(&dev_priv->resource_lock);
1214                         break;
1215                 }
1216
1217                 evict_res = vmw_resource_reference
1218                         (list_first_entry(lru_list, struct vmw_resource,
1219                                           lru_head));
1220                 list_del_init(&evict_res->lru_head);
1221
1222                 write_unlock(&dev_priv->resource_lock);
1223
1224                 ret = vmw_resource_do_evict(evict_res, true);
1225                 if (unlikely(ret != 0)) {
1226                         write_lock(&dev_priv->resource_lock);
1227                         list_add_tail(&evict_res->lru_head, lru_list);
1228                         write_unlock(&dev_priv->resource_lock);
1229                         if (ret == -ERESTARTSYS ||
1230                             ++err_count > VMW_RES_EVICT_ERR_COUNT) {
1231                                 vmw_resource_unreference(&evict_res);
1232                                 goto out_no_validate;
1233                         }
1234                 }
1235
1236                 vmw_resource_unreference(&evict_res);
1237         } while (1);
1238
1239         if (unlikely(ret != 0))
1240                 goto out_no_validate;
1241         else if (!res->func->needs_backup && res->backup) {
1242                 list_del_init(&res->mob_head);
1243                 vmw_dmabuf_unreference(&res->backup);
1244         }
1245
1246         return 0;
1247
1248 out_no_validate:
1249         return ret;
1250 }
1251
1252 /**
1253  * vmw_fence_single_bo - Utility function to fence a single TTM buffer
1254  *                       object without unreserving it.
1255  *
1256  * @bo:             Pointer to the struct ttm_buffer_object to fence.
1257  * @fence:          Pointer to the fence. If NULL, this function will
1258  *                  insert a fence into the command stream..
1259  *
1260  * Contrary to the ttm_eu version of this function, it takes only
1261  * a single buffer object instead of a list, and it also doesn't
1262  * unreserve the buffer object, which needs to be done separately.
1263  */
1264 void vmw_fence_single_bo(struct ttm_buffer_object *bo,
1265                          struct vmw_fence_obj *fence)
1266 {
1267         struct ttm_bo_device *bdev = bo->bdev;
1268         struct ttm_bo_driver *driver = bdev->driver;
1269         struct vmw_fence_obj *old_fence_obj;
1270         struct vmw_private *dev_priv =
1271                 container_of(bdev, struct vmw_private, bdev);
1272
1273         if (fence == NULL)
1274                 vmw_execbuf_fence_commands(NULL, dev_priv, &fence, NULL);
1275         else
1276                 driver->sync_obj_ref(fence);
1277
1278         spin_lock(&bdev->fence_lock);
1279
1280         old_fence_obj = bo->sync_obj;
1281         bo->sync_obj = fence;
1282
1283         spin_unlock(&bdev->fence_lock);
1284
1285         if (old_fence_obj)
1286                 vmw_fence_obj_unreference(&old_fence_obj);
1287 }
1288
1289 /**
1290  * vmw_resource_move_notify - TTM move_notify_callback
1291  *
1292  * @bo:             The TTM buffer object about to move.
1293  * @mem:            The truct ttm_mem_reg indicating to what memory
1294  *                  region the move is taking place.
1295  *
1296  * For now does nothing.
1297  */
1298 void vmw_resource_move_notify(struct ttm_buffer_object *bo,
1299                               struct ttm_mem_reg *mem)
1300 {
1301 }
1302
1303 /**
1304  * vmw_resource_needs_backup - Return whether a resource needs a backup buffer.
1305  *
1306  * @res:            The resource being queried.
1307  */
1308 bool vmw_resource_needs_backup(const struct vmw_resource *res)
1309 {
1310         return res->func->needs_backup;
1311 }
1312
1313 /**
1314  * vmw_resource_evict_type - Evict all resources of a specific type
1315  *
1316  * @dev_priv:       Pointer to a device private struct
1317  * @type:           The resource type to evict
1318  *
1319  * To avoid thrashing starvation or as part of the hibernation sequence,
1320  * try to evict all evictable resources of a specific type.
1321  */
1322 static void vmw_resource_evict_type(struct vmw_private *dev_priv,
1323                                     enum vmw_res_type type)
1324 {
1325         struct list_head *lru_list = &dev_priv->res_lru[type];
1326         struct vmw_resource *evict_res;
1327         unsigned err_count = 0;
1328         int ret;
1329
1330         do {
1331                 write_lock(&dev_priv->resource_lock);
1332
1333                 if (list_empty(lru_list))
1334                         goto out_unlock;
1335
1336                 evict_res = vmw_resource_reference(
1337                         list_first_entry(lru_list, struct vmw_resource,
1338                                          lru_head));
1339                 list_del_init(&evict_res->lru_head);
1340                 write_unlock(&dev_priv->resource_lock);
1341
1342                 ret = vmw_resource_do_evict(evict_res, false);
1343                 if (unlikely(ret != 0)) {
1344                         write_lock(&dev_priv->resource_lock);
1345                         list_add_tail(&evict_res->lru_head, lru_list);
1346                         write_unlock(&dev_priv->resource_lock);
1347                         if (++err_count > VMW_RES_EVICT_ERR_COUNT) {
1348                                 vmw_resource_unreference(&evict_res);
1349                                 return;
1350                         }
1351                 }
1352
1353                 vmw_resource_unreference(&evict_res);
1354         } while (1);
1355
1356 out_unlock:
1357         write_unlock(&dev_priv->resource_lock);
1358 }
1359
1360 /**
1361  * vmw_resource_evict_all - Evict all evictable resources
1362  *
1363  * @dev_priv:       Pointer to a device private struct
1364  *
1365  * To avoid thrashing starvation or as part of the hibernation sequence,
1366  * evict all evictable resources. In particular this means that all
1367  * guest-backed resources that are registered with the device are
1368  * evicted and the OTable becomes clean.
1369  */
1370 void vmw_resource_evict_all(struct vmw_private *dev_priv)
1371 {
1372         enum vmw_res_type type;
1373
1374         mutex_lock(&dev_priv->cmdbuf_mutex);
1375
1376         for (type = 0; type < vmw_res_max; ++type)
1377                 vmw_resource_evict_type(dev_priv, type);
1378
1379         mutex_unlock(&dev_priv->cmdbuf_mutex);
1380 }