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 static void vmw_user_dmabuf_ref_obj_release(struct ttm_base_object *base,
 445                                             enum ttm_ref_type ref_type)
 446 {
 447         struct vmw_user_dma_buffer *user_bo;
 448         user_bo = container_of(base, struct vmw_user_dma_buffer, prime.base);
 449
 450         switch (ref_type) {
 451         case TTM_REF_SYNCCPU_WRITE:
 452                 ttm_bo_synccpu_write_release(&user_bo->dma.base);
 453                 break;
 454         default:
 455                 BUG();
 456         }
 457 }
 458
 459 /**
 460  * vmw_user_dmabuf_alloc - Allocate a user dma buffer
 461  *
 462  * @dev_priv: Pointer to a struct device private.
 463  * @tfile: Pointer to a struct ttm_object_file on which to register the user
 464  * object.
 465  * @size: Size of the dma buffer.
 466  * @shareable: Boolean whether the buffer is shareable with other open files.
 467  * @handle: Pointer to where the handle value should be assigned.
 468  * @p_dma_buf: Pointer to where the refcounted struct vmw_dma_buffer pointer
 469  * should be assigned.
 470  */
 471 int vmw_user_dmabuf_alloc(struct vmw_private *dev_priv,
 472                           struct ttm_object_file *tfile,
 473                           uint32_t size,
 474                           bool shareable,
 475                           uint32_t *handle,
 476                           struct vmw_dma_buffer **p_dma_buf)
 477 {
 478         struct vmw_user_dma_buffer *user_bo;
 479         struct ttm_buffer_object *tmp;
 480         int ret;
 481
 482         user_bo = kzalloc(sizeof(*user_bo), GFP_KERNEL);
 483         if (unlikely(user_bo == NULL)) {
 484                 DRM_ERROR("Failed to allocate a buffer.\n");
 485                 return -ENOMEM;
 486         }
 487
 488         ret = vmw_dmabuf_init(dev_priv, &user_bo->dma, size,
 489                               (dev_priv->has_mob) ?
 490                               &vmw_sys_placement :
 491                               &vmw_vram_sys_placement, true,
 492                               &vmw_user_dmabuf_destroy);
 493         if (unlikely(ret != 0))
 494                 return ret;
 495
 496         tmp = ttm_bo_reference(&user_bo->dma.base);
 497         ret = ttm_prime_object_init(tfile,
 498                                     size,
 499                                     &user_bo->prime,
 500                                     shareable,
 501                                     ttm_buffer_type,
 502                                     &vmw_user_dmabuf_release,
 503                                     &vmw_user_dmabuf_ref_obj_release);
 504         if (unlikely(ret != 0)) {
 505                 ttm_bo_unref(&tmp);
 506                 goto out_no_base_object;
 507         }
 508
 509         *p_dma_buf = &user_bo->dma;
 510         *handle = user_bo->prime.base.hash.key;
 511
 512 out_no_base_object:
 513         return ret;
 514 }
 515
 516 /**
 517  * vmw_user_dmabuf_verify_access - verify access permissions on this
 518  * buffer object.
 519  *
 520  * @bo: Pointer to the buffer object being accessed
 521  * @tfile: Identifying the caller.
 522  */
 523 int vmw_user_dmabuf_verify_access(struct ttm_buffer_object *bo,
 524                                   struct ttm_object_file *tfile)
 525 {
 526         struct vmw_user_dma_buffer *vmw_user_bo;
 527
 528         if (unlikely(bo->destroy != vmw_user_dmabuf_destroy))
 529                 return -EPERM;
 530
 531         vmw_user_bo = vmw_user_dma_buffer(bo);
 532         return (vmw_user_bo->prime.base.tfile == tfile ||
 533                 vmw_user_bo->prime.base.shareable) ? 0 : -EPERM;
 534 }
 535
 536 /**
 537  * vmw_user_dmabuf_synccpu_grab - Grab a struct vmw_user_dma_buffer for cpu
 538  * access, idling previous GPU operations on the buffer and optionally
 539  * blocking it for further command submissions.
 540  *
 541  * @user_bo: Pointer to the buffer object being grabbed for CPU access
 542  * @tfile: Identifying the caller.
 543  * @flags: Flags indicating how the grab should be performed.
 544  *
 545  * A blocking grab will be automatically released when @tfile is closed.
 546  */
 547 static int vmw_user_dmabuf_synccpu_grab(struct vmw_user_dma_buffer *user_bo,
 548                                         struct ttm_object_file *tfile,
 549                                         uint32_t flags)
 550 {
 551         struct ttm_buffer_object *bo = &user_bo->dma.base;
 552         bool existed;
 553         int ret;
 554
 555         if (flags & drm_vmw_synccpu_allow_cs) {
 556                 struct ttm_bo_device *bdev = bo->bdev;
 557
 558                 spin_lock(&bdev->fence_lock);
 559                 ret = ttm_bo_wait(bo, false, true,
 560                                   !!(flags & drm_vmw_synccpu_dontblock));
 561                 spin_unlock(&bdev->fence_lock);
 562                 return ret;
 563         }
 564
 565         ret = ttm_bo_synccpu_write_grab
 566                 (bo, !!(flags & drm_vmw_synccpu_dontblock));
 567         if (unlikely(ret != 0))
 568                 return ret;
 569
 570         ret = ttm_ref_object_add(tfile, &user_bo->prime.base,
 571                                  TTM_REF_SYNCCPU_WRITE, &existed);
 572         if (ret != 0 || existed)
 573                 ttm_bo_synccpu_write_release(&user_bo->dma.base);
 574
 575         return ret;
 576 }
 577
 578 /**
 579  * vmw_user_dmabuf_synccpu_release - Release a previous grab for CPU access,
 580  * and unblock command submission on the buffer if blocked.
 581  *
 582  * @handle: Handle identifying the buffer object.
 583  * @tfile: Identifying the caller.
 584  * @flags: Flags indicating the type of release.
 585  */
 586 static int vmw_user_dmabuf_synccpu_release(uint32_t handle,
 587                                            struct ttm_object_file *tfile,
 588                                            uint32_t flags)
 589 {
 590         if (!(flags & drm_vmw_synccpu_allow_cs))
 591                 return ttm_ref_object_base_unref(tfile, handle,
 592                                                  TTM_REF_SYNCCPU_WRITE);
 593
 594         return 0;
 595 }
 596
 597 /**
 598  * vmw_user_dmabuf_synccpu_release - ioctl function implementing the synccpu
 599  * functionality.
 600  *
 601  * @dev: Identifies the drm device.
 602  * @data: Pointer to the ioctl argument.
 603  * @file_priv: Identifies the caller.
 604  *
 605  * This function checks the ioctl arguments for validity and calls the
 606  * relevant synccpu functions.
 607  */
 608 int vmw_user_dmabuf_synccpu_ioctl(struct drm_device *dev, void *data,
 609                                   struct drm_file *file_priv)
 610 {
 611         struct drm_vmw_synccpu_arg *arg =
 612                 (struct drm_vmw_synccpu_arg *) data;
 613         struct vmw_dma_buffer *dma_buf;
 614         struct vmw_user_dma_buffer *user_bo;
 615         struct ttm_object_file *tfile = vmw_fpriv(file_priv)->tfile;
 616         int ret;
 617
 618         if ((arg->flags & (drm_vmw_synccpu_read | drm_vmw_synccpu_write)) == 0
 619             || (arg->flags & ~(drm_vmw_synccpu_read | drm_vmw_synccpu_write |
 620                                drm_vmw_synccpu_dontblock |
 621                                drm_vmw_synccpu_allow_cs)) != 0) {
 622                 DRM_ERROR("Illegal synccpu flags.\n");
 623                 return -EINVAL;
 624         }
 625
 626         switch (arg->op) {
 627         case drm_vmw_synccpu_grab:
 628                 ret = vmw_user_dmabuf_lookup(tfile, arg->handle, &dma_buf);
 629                 if (unlikely(ret != 0))
 630                         return ret;
 631
 632                 user_bo = container_of(dma_buf, struct vmw_user_dma_buffer,
 633                                        dma);
 634                 ret = vmw_user_dmabuf_synccpu_grab(user_bo, tfile, arg->flags);
 635                 vmw_dmabuf_unreference(&dma_buf);
 636                 if (unlikely(ret != 0 && ret != -ERESTARTSYS &&
 637                              ret != -EBUSY)) {
 638                         DRM_ERROR("Failed synccpu grab on handle 0x%08x.\n",
 639                                   (unsigned int) arg->handle);
 640                         return ret;
 641                 }
 642                 break;
 643         case drm_vmw_synccpu_release:
 644                 ret = vmw_user_dmabuf_synccpu_release(arg->handle, tfile,
 645                                                       arg->flags);
 646                 if (unlikely(ret != 0)) {
 647                         DRM_ERROR("Failed synccpu release on handle 0x%08x.\n",
 648                                   (unsigned int) arg->handle);
 649                         return ret;
 650                 }
 651                 break;
 652         default:
 653                 DRM_ERROR("Invalid synccpu operation.\n");
 654                 return -EINVAL;
 655         }
 656
 657         return 0;
 658 }
 659
 660 int vmw_dmabuf_alloc_ioctl(struct drm_device *dev, void *data,
 661                            struct drm_file *file_priv)
 662 {
 663         struct vmw_private *dev_priv = vmw_priv(dev);
 664         union drm_vmw_alloc_dmabuf_arg *arg =
 665             (union drm_vmw_alloc_dmabuf_arg *)data;
 666         struct drm_vmw_alloc_dmabuf_req *req = &arg->req;
 667         struct drm_vmw_dmabuf_rep *rep = &arg->rep;
 668         struct vmw_dma_buffer *dma_buf;
 669         uint32_t handle;
 670         struct vmw_master *vmaster = vmw_master(file_priv->master);
 671         int ret;
 672
 673         ret = ttm_read_lock(&vmaster->lock, true);
 674         if (unlikely(ret != 0))
 675                 return ret;
 676
 677         ret = vmw_user_dmabuf_alloc(dev_priv, vmw_fpriv(file_priv)->tfile,
 678                                     req->size, false, &handle, &dma_buf);
 679         if (unlikely(ret != 0))
 680                 goto out_no_dmabuf;
 681
 682         rep->handle = handle;
 683         rep->map_handle = drm_vma_node_offset_addr(&dma_buf->base.vma_node);
 684         rep->cur_gmr_id = handle;
 685         rep->cur_gmr_offset = 0;
 686
 687         vmw_dmabuf_unreference(&dma_buf);
 688
 689 out_no_dmabuf:
 690         ttm_read_unlock(&vmaster->lock);
 691
 692         return ret;
 693 }
 694
 695 int vmw_dmabuf_unref_ioctl(struct drm_device *dev, void *data,
 696                            struct drm_file *file_priv)
 697 {
 698         struct drm_vmw_unref_dmabuf_arg *arg =
 699             (struct drm_vmw_unref_dmabuf_arg *)data;
 700
 701         return ttm_ref_object_base_unref(vmw_fpriv(file_priv)->tfile,
 702                                          arg->handle,
 703                                          TTM_REF_USAGE);
 704 }
 705
 706 int vmw_user_dmabuf_lookup(struct ttm_object_file *tfile,
 707                            uint32_t handle, struct vmw_dma_buffer **out)
 708 {
 709         struct vmw_user_dma_buffer *vmw_user_bo;
 710         struct ttm_base_object *base;
 711
 712         base = ttm_base_object_lookup(tfile, handle);
 713         if (unlikely(base == NULL)) {
 714                 printk(KERN_ERR "Invalid buffer object handle 0x%08lx.\n",
 715                        (unsigned long)handle);
 716                 return -ESRCH;
 717         }
 718
 719         if (unlikely(ttm_base_object_type(base) != ttm_buffer_type)) {
 720                 ttm_base_object_unref(&base);
 721                 printk(KERN_ERR "Invalid buffer object handle 0x%08lx.\n",
 722                        (unsigned long)handle);
 723                 return -EINVAL;
 724         }
 725
 726         vmw_user_bo = container_of(base, struct vmw_user_dma_buffer,
 727                                    prime.base);
 728         (void)ttm_bo_reference(&vmw_user_bo->dma.base);
 729         ttm_base_object_unref(&base);
 730         *out = &vmw_user_bo->dma;
 731
 732         return 0;
 733 }
 734
 735 int vmw_user_dmabuf_reference(struct ttm_object_file *tfile,
 736                               struct vmw_dma_buffer *dma_buf,
 737                               uint32_t *handle)
 738 {
 739         struct vmw_user_dma_buffer *user_bo;
 740
 741         if (dma_buf->base.destroy != vmw_user_dmabuf_destroy)
 742                 return -EINVAL;
 743
 744         user_bo = container_of(dma_buf, struct vmw_user_dma_buffer, dma);
 745
 746         *handle = user_bo->prime.base.hash.key;
 747         return ttm_ref_object_add(tfile, &user_bo->prime.base,
 748                                   TTM_REF_USAGE, NULL);
 749 }
 750
 751 /*
 752  * Stream management
 753  */
 754
 755 static void vmw_stream_destroy(struct vmw_resource *res)
 756 {
 757         struct vmw_private *dev_priv = res->dev_priv;
 758         struct vmw_stream *stream;
 759         int ret;
 760
 761         DRM_INFO("%s: unref\n", __func__);
 762         stream = container_of(res, struct vmw_stream, res);
 763
 764         ret = vmw_overlay_unref(dev_priv, stream->stream_id);
 765         WARN_ON(ret != 0);
 766 }
 767
 768 static int vmw_stream_init(struct vmw_private *dev_priv,
 769                            struct vmw_stream *stream,
 770                            void (*res_free) (struct vmw_resource *res))
 771 {
 772         struct vmw_resource *res = &stream->res;
 773         int ret;
 774
 775         ret = vmw_resource_init(dev_priv, res, false, res_free,
 776                                 &vmw_stream_func);
 777
 778         if (unlikely(ret != 0)) {
 779                 if (res_free == NULL)
 780                         kfree(stream);
 781                 else
 782                         res_free(&stream->res);
 783                 return ret;
 784         }
 785
 786         ret = vmw_overlay_claim(dev_priv, &stream->stream_id);
 787         if (ret) {
 788                 vmw_resource_unreference(&res);
 789                 return ret;
 790         }
 791
 792         DRM_INFO("%s: claimed\n", __func__);
 793
 794         vmw_resource_activate(&stream->res, vmw_stream_destroy);
 795         return 0;
 796 }
 797
 798 static void vmw_user_stream_free(struct vmw_resource *res)
 799 {
 800         struct vmw_user_stream *stream =
 801             container_of(res, struct vmw_user_stream, stream.res);
 802         struct vmw_private *dev_priv = res->dev_priv;
 803
 804         ttm_base_object_kfree(stream, base);
 805         ttm_mem_global_free(vmw_mem_glob(dev_priv),
 806                             vmw_user_stream_size);
 807 }
 808
 809 /**
 810  * This function is called when user space has no more references on the
 811  * base object. It releases the base-object's reference on the resource object.
 812  */
 813
 814 static void vmw_user_stream_base_release(struct ttm_base_object **p_base)
 815 {
 816         struct ttm_base_object *base = *p_base;
 817         struct vmw_user_stream *stream =
 818             container_of(base, struct vmw_user_stream, base);
 819         struct vmw_resource *res = &stream->stream.res;
 820
 821         *p_base = NULL;
 822         vmw_resource_unreference(&res);
 823 }
 824
 825 int vmw_stream_unref_ioctl(struct drm_device *dev, void *data,
 826                            struct drm_file *file_priv)
 827 {
 828         struct vmw_private *dev_priv = vmw_priv(dev);
 829         struct vmw_resource *res;
 830         struct vmw_user_stream *stream;
 831         struct drm_vmw_stream_arg *arg = (struct drm_vmw_stream_arg *)data;
 832         struct ttm_object_file *tfile = vmw_fpriv(file_priv)->tfile;
 833         struct idr *idr = &dev_priv->res_idr[vmw_res_stream];
 834         int ret = 0;
 835
 836
 837         res = vmw_resource_lookup(dev_priv, idr, arg->stream_id);
 838         if (unlikely(res == NULL))
 839                 return -EINVAL;
 840
 841         if (res->res_free != &vmw_user_stream_free) {
 842                 ret = -EINVAL;
 843                 goto out;
 844         }
 845
 846         stream = container_of(res, struct vmw_user_stream, stream.res);
 847         if (stream->base.tfile != tfile) {
 848                 ret = -EINVAL;
 849                 goto out;
 850         }
 851
 852         ttm_ref_object_base_unref(tfile, stream->base.hash.key, TTM_REF_USAGE);
 853 out:
 854         vmw_resource_unreference(&res);
 855         return ret;
 856 }
 857
 858 int vmw_stream_claim_ioctl(struct drm_device *dev, void *data,
 859                            struct drm_file *file_priv)
 860 {
 861         struct vmw_private *dev_priv = vmw_priv(dev);
 862         struct vmw_user_stream *stream;
 863         struct vmw_resource *res;
 864         struct vmw_resource *tmp;
 865         struct drm_vmw_stream_arg *arg = (struct drm_vmw_stream_arg *)data;
 866         struct ttm_object_file *tfile = vmw_fpriv(file_priv)->tfile;
 867         struct vmw_master *vmaster = vmw_master(file_priv->master);
 868         int ret;
 869
 870         /*
 871          * Approximate idr memory usage with 128 bytes. It will be limited
 872          * by maximum number_of streams anyway?
 873          */
 874
 875         if (unlikely(vmw_user_stream_size == 0))
 876                 vmw_user_stream_size = ttm_round_pot(sizeof(*stream)) + 128;
 877
 878         ret = ttm_read_lock(&vmaster->lock, true);
 879         if (unlikely(ret != 0))
 880                 return ret;
 881
 882         ret = ttm_mem_global_alloc(vmw_mem_glob(dev_priv),
 883                                    vmw_user_stream_size,
 884                                    false, true);
 885         if (unlikely(ret != 0)) {
 886                 if (ret != -ERESTARTSYS)
 887                         DRM_ERROR("Out of graphics memory for stream"
 888                                   " creation.\n");
 889                 goto out_unlock;
 890         }
 891
 892
 893         stream = kmalloc(sizeof(*stream), GFP_KERNEL);
 894         if (unlikely(stream == NULL)) {
 895                 ttm_mem_global_free(vmw_mem_glob(dev_priv),
 896                                     vmw_user_stream_size);
 897                 ret = -ENOMEM;
 898                 goto out_unlock;
 899         }
 900
 901         res = &stream->stream.res;
 902         stream->base.shareable = false;
 903         stream->base.tfile = NULL;
 904
 905         /*
 906          * From here on, the destructor takes over resource freeing.
 907          */
 908
 909         ret = vmw_stream_init(dev_priv, &stream->stream, vmw_user_stream_free);
 910         if (unlikely(ret != 0))
 911                 goto out_unlock;
 912
 913         tmp = vmw_resource_reference(res);
 914         ret = ttm_base_object_init(tfile, &stream->base, false, VMW_RES_STREAM,
 915                                    &vmw_user_stream_base_release, NULL);
 916
 917         if (unlikely(ret != 0)) {
 918                 vmw_resource_unreference(&tmp);
 919                 goto out_err;
 920         }
 921
 922         arg->stream_id = res->id;
 923 out_err:
 924         vmw_resource_unreference(&res);
 925 out_unlock:
 926         ttm_read_unlock(&vmaster->lock);
 927         return ret;
 928 }
 929
 930 int vmw_user_stream_lookup(struct vmw_private *dev_priv,
 931                            struct ttm_object_file *tfile,
 932                            uint32_t *inout_id, struct vmw_resource **out)
 933 {
 934         struct vmw_user_stream *stream;
 935         struct vmw_resource *res;
 936         int ret;
 937
 938         res = vmw_resource_lookup(dev_priv, &dev_priv->res_idr[vmw_res_stream],
 939                                   *inout_id);
 940         if (unlikely(res == NULL))
 941                 return -EINVAL;
 942
 943         if (res->res_free != &vmw_user_stream_free) {
 944                 ret = -EINVAL;
 945                 goto err_ref;
 946         }
 947
 948         stream = container_of(res, struct vmw_user_stream, stream.res);
 949         if (stream->base.tfile != tfile) {
 950                 ret = -EPERM;
 951                 goto err_ref;
 952         }
 953
 954         *inout_id = stream->stream.stream_id;
 955         *out = res;
 956         return 0;
 957 err_ref:
 958         vmw_resource_unreference(&res);
 959         return ret;
 960 }
 961
 962
 963 /**
 964  * vmw_dumb_create - Create a dumb kms buffer
 965  *
 966  * @file_priv: Pointer to a struct drm_file identifying the caller.
 967  * @dev: Pointer to the drm device.
 968  * @args: Pointer to a struct drm_mode_create_dumb structure
 969  *
 970  * This is a driver callback for the core drm create_dumb functionality.
 971  * Note that this is very similar to the vmw_dmabuf_alloc ioctl, except
 972  * that the arguments have a different format.
 973  */
 974 int vmw_dumb_create(struct drm_file *file_priv,
 975                     struct drm_device *dev,
 976                     struct drm_mode_create_dumb *args)
 977 {
 978         struct vmw_private *dev_priv = vmw_priv(dev);
 979         struct vmw_master *vmaster = vmw_master(file_priv->master);
 980         struct vmw_dma_buffer *dma_buf;
 981         int ret;
 982
 983         args->pitch = args->width * ((args->bpp + 7) / 8);
 984         args->size = args->pitch * args->height;
 985
 986         ret = ttm_read_lock(&vmaster->lock, true);
 987         if (unlikely(ret != 0))
 988                 return ret;
 989
 990         ret = vmw_user_dmabuf_alloc(dev_priv, vmw_fpriv(file_priv)->tfile,
 991                                     args->size, false, &args->handle,
 992                                     &dma_buf);
 993         if (unlikely(ret != 0))
 994                 goto out_no_dmabuf;
 995
 996         vmw_dmabuf_unreference(&dma_buf);
 997 out_no_dmabuf:
 998         ttm_read_unlock(&vmaster->lock);
 999         return ret;
1000 }
1001
1002 /**
1003  * vmw_dumb_map_offset - Return the address space offset of a dumb buffer
1004  *
1005  * @file_priv: Pointer to a struct drm_file identifying the caller.
1006  * @dev: Pointer to the drm device.
1007  * @handle: Handle identifying the dumb buffer.
1008  * @offset: The address space offset returned.
1009  *
1010  * This is a driver callback for the core drm dumb_map_offset functionality.
1011  */
1012 int vmw_dumb_map_offset(struct drm_file *file_priv,
1013                         struct drm_device *dev, uint32_t handle,
1014                         uint64_t *offset)
1015 {
1016         struct ttm_object_file *tfile = vmw_fpriv(file_priv)->tfile;
1017         struct vmw_dma_buffer *out_buf;
1018         int ret;
1019
1020         ret = vmw_user_dmabuf_lookup(tfile, handle, &out_buf);
1021         if (ret != 0)
1022                 return -EINVAL;
1023
1024         *offset = drm_vma_node_offset_addr(&out_buf->base.vma_node);
1025         vmw_dmabuf_unreference(&out_buf);
1026         return 0;
1027 }
1028
1029 /**
1030  * vmw_dumb_destroy - Destroy a dumb boffer
1031  *
1032  * @file_priv: Pointer to a struct drm_file identifying the caller.
1033  * @dev: Pointer to the drm device.
1034  * @handle: Handle identifying the dumb buffer.
1035  *
1036  * This is a driver callback for the core drm dumb_destroy functionality.
1037  */
1038 int vmw_dumb_destroy(struct drm_file *file_priv,
1039                      struct drm_device *dev,
1040                      uint32_t handle)
1041 {
1042         return ttm_ref_object_base_unref(vmw_fpriv(file_priv)->tfile,
1043                                          handle, TTM_REF_USAGE);
1044 }
1045
1046 /**
1047  * vmw_resource_buf_alloc - Allocate a backup buffer for a resource.
1048  *
1049  * @res:            The resource for which to allocate a backup buffer.
1050  * @interruptible:  Whether any sleeps during allocation should be
1051  *                  performed while interruptible.
1052  */
1053 static int vmw_resource_buf_alloc(struct vmw_resource *res,
1054                                   bool interruptible)
1055 {
1056         unsigned long size =
1057                 (res->backup_size + PAGE_SIZE - 1) & PAGE_MASK;
1058         struct vmw_dma_buffer *backup;
1059         int ret;
1060
1061         if (likely(res->backup)) {
1062                 BUG_ON(res->backup->base.num_pages * PAGE_SIZE < size);
1063                 return 0;
1064         }
1065
1066         backup = kzalloc(sizeof(*backup), GFP_KERNEL);
1067         if (unlikely(backup == NULL))
1068                 return -ENOMEM;
1069
1070         ret = vmw_dmabuf_init(res->dev_priv, backup, res->backup_size,
1071                               res->func->backup_placement,
1072                               interruptible,
1073                               &vmw_dmabuf_bo_free);
1074         if (unlikely(ret != 0))
1075                 goto out_no_dmabuf;
1076
1077         res->backup = backup;
1078
1079 out_no_dmabuf:
1080         return ret;
1081 }
1082
1083 /**
1084  * vmw_resource_do_validate - Make a resource up-to-date and visible
1085  *                            to the device.
1086  *
1087  * @res:            The resource to make visible to the device.
1088  * @val_buf:        Information about a buffer possibly
1089  *                  containing backup data if a bind operation is needed.
1090  *
1091  * On hardware resource shortage, this function returns -EBUSY and
1092  * should be retried once resources have been freed up.
1093  */
1094 static int vmw_resource_do_validate(struct vmw_resource *res,
1095                                     struct ttm_validate_buffer *val_buf)
1096 {
1097         int ret = 0;
1098         const struct vmw_res_func *func = res->func;
1099
1100         if (unlikely(res->id == -1)) {
1101                 ret = func->create(res);
1102                 if (unlikely(ret != 0))
1103                         return ret;
1104         }
1105
1106         if (func->bind &&
1107             ((func->needs_backup && list_empty(&res->mob_head) &&
1108               val_buf->bo != NULL) ||
1109              (!func->needs_backup && val_buf->bo != NULL))) {
1110                 ret = func->bind(res, val_buf);
1111                 if (unlikely(ret != 0))
1112                         goto out_bind_failed;
1113                 if (func->needs_backup)
1114                         list_add_tail(&res->mob_head, &res->backup->res_list);
1115         }
1116
1117         /*
1118          * Only do this on write operations, and move to
1119          * vmw_resource_unreserve if it can be called after
1120          * backup buffers have been unreserved. Otherwise
1121          * sort out locking.
1122          */
1123         res->res_dirty = true;
1124
1125         return 0;
1126
1127 out_bind_failed:
1128         func->destroy(res);
1129
1130         return ret;
1131 }
1132
1133 /**
1134  * vmw_resource_unreserve - Unreserve a resource previously reserved for
1135  * command submission.
1136  *
1137  * @res:               Pointer to the struct vmw_resource to unreserve.
1138  * @new_backup:        Pointer to new backup buffer if command submission
1139  *                     switched.
1140  * @new_backup_offset: New backup offset if @new_backup is !NULL.
1141  *
1142  * Currently unreserving a resource means putting it back on the device's
1143  * resource lru list, so that it can be evicted if necessary.
1144  */
1145 void vmw_resource_unreserve(struct vmw_resource *res,
1146                             struct vmw_dma_buffer *new_backup,
1147                             unsigned long new_backup_offset)
1148 {
1149         struct vmw_private *dev_priv = res->dev_priv;
1150
1151         if (!list_empty(&res->lru_head))
1152                 return;
1153
1154         if (new_backup && new_backup != res->backup) {
1155
1156                 if (res->backup) {
1157                         lockdep_assert_held(&res->backup->base.resv->lock.base);
1158                         list_del_init(&res->mob_head);
1159                         vmw_dmabuf_unreference(&res->backup);
1160                 }
1161
1162                 res->backup = vmw_dmabuf_reference(new_backup);
1163                 lockdep_assert_held(&new_backup->base.resv->lock.base);
1164                 list_add_tail(&res->mob_head, &new_backup->res_list);
1165         }
1166         if (new_backup)
1167                 res->backup_offset = new_backup_offset;
1168
1169         if (!res->func->may_evict || res->id == -1)
1170                 return;
1171
1172         write_lock(&dev_priv->resource_lock);
1173         list_add_tail(&res->lru_head,
1174                       &res->dev_priv->res_lru[res->func->res_type]);
1175         write_unlock(&dev_priv->resource_lock);
1176 }
1177
1178 /**
1179  * vmw_resource_check_buffer - Check whether a backup buffer is needed
1180  *                             for a resource and in that case, allocate
1181  *                             one, reserve and validate it.
1182  *
1183  * @res:            The resource for which to allocate a backup buffer.
1184  * @interruptible:  Whether any sleeps during allocation should be
1185  *                  performed while interruptible.
1186  * @val_buf:        On successful return contains data about the
1187  *                  reserved and validated backup buffer.
1188  */
1189 static int
1190 vmw_resource_check_buffer(struct vmw_resource *res,
1191                           bool interruptible,
1192                           struct ttm_validate_buffer *val_buf)
1193 {
1194         struct list_head val_list;
1195         bool backup_dirty = false;
1196         int ret;
1197
1198         if (unlikely(res->backup == NULL)) {
1199                 ret = vmw_resource_buf_alloc(res, interruptible);
1200                 if (unlikely(ret != 0))
1201                         return ret;
1202         }
1203
1204         INIT_LIST_HEAD(&val_list);
1205         val_buf->bo = ttm_bo_reference(&res->backup->base);
1206         list_add_tail(&val_buf->head, &val_list);
1207         ret = ttm_eu_reserve_buffers(NULL, &val_list);
1208         if (unlikely(ret != 0))
1209                 goto out_no_reserve;
1210
1211         if (res->func->needs_backup && list_empty(&res->mob_head))
1212                 return 0;
1213
1214         backup_dirty = res->backup_dirty;
1215         ret = ttm_bo_validate(&res->backup->base,
1216                               res->func->backup_placement,
1217                               true, false);
1218
1219         if (unlikely(ret != 0))
1220                 goto out_no_validate;
1221
1222         return 0;
1223
1224 out_no_validate:
1225         ttm_eu_backoff_reservation(NULL, &val_list);
1226 out_no_reserve:
1227         ttm_bo_unref(&val_buf->bo);
1228         if (backup_dirty)
1229                 vmw_dmabuf_unreference(&res->backup);
1230
1231         return ret;
1232 }
1233
1234 /**
1235  * vmw_resource_reserve - Reserve a resource for command submission
1236  *
1237  * @res:            The resource to reserve.
1238  *
1239  * This function takes the resource off the LRU list and make sure
1240  * a backup buffer is present for guest-backed resources. However,
1241  * the buffer may not be bound to the resource at this point.
1242  *
1243  */
1244 int vmw_resource_reserve(struct vmw_resource *res, bool no_backup)
1245 {
1246         struct vmw_private *dev_priv = res->dev_priv;
1247         int ret;
1248
1249         write_lock(&dev_priv->resource_lock);
1250         list_del_init(&res->lru_head);
1251         write_unlock(&dev_priv->resource_lock);
1252
1253         if (res->func->needs_backup && res->backup == NULL &&
1254             !no_backup) {
1255                 ret = vmw_resource_buf_alloc(res, true);
1256                 if (unlikely(ret != 0))
1257                         return ret;
1258         }
1259
1260         return 0;
1261 }
1262
1263 /**
1264  * vmw_resource_backoff_reservation - Unreserve and unreference a
1265  *                                    backup buffer
1266  *.
1267  * @val_buf:        Backup buffer information.
1268  */
1269 static void
1270 vmw_resource_backoff_reservation(struct ttm_validate_buffer *val_buf)
1271 {
1272         struct list_head val_list;
1273
1274         if (likely(val_buf->bo == NULL))
1275                 return;
1276
1277         INIT_LIST_HEAD(&val_list);
1278         list_add_tail(&val_buf->head, &val_list);
1279         ttm_eu_backoff_reservation(NULL, &val_list);
1280         ttm_bo_unref(&val_buf->bo);
1281 }
1282
1283 /**
1284  * vmw_resource_do_evict - Evict a resource, and transfer its data
1285  *                         to a backup buffer.
1286  *
1287  * @res:            The resource to evict.
1288  * @interruptible:  Whether to wait interruptible.
1289  */
1290 int vmw_resource_do_evict(struct vmw_resource *res, bool interruptible)
1291 {
1292         struct ttm_validate_buffer val_buf;
1293         const struct vmw_res_func *func = res->func;
1294         int ret;
1295
1296         BUG_ON(!func->may_evict);
1297
1298         val_buf.bo = NULL;
1299         ret = vmw_resource_check_buffer(res, interruptible, &val_buf);
1300         if (unlikely(ret != 0))
1301                 return ret;
1302
1303         if (unlikely(func->unbind != NULL &&
1304                      (!func->needs_backup || !list_empty(&res->mob_head)))) {
1305                 ret = func->unbind(res, res->res_dirty, &val_buf);
1306                 if (unlikely(ret != 0))
1307                         goto out_no_unbind;
1308                 list_del_init(&res->mob_head);
1309         }
1310         ret = func->destroy(res);
1311         res->backup_dirty = true;
1312         res->res_dirty = false;
1313 out_no_unbind:
1314         vmw_resource_backoff_reservation(&val_buf);
1315
1316         return ret;
1317 }
1318
1319
1320 /**
1321  * vmw_resource_validate - Make a resource up-to-date and visible
1322  *                         to the device.
1323  *
1324  * @res:            The resource to make visible to the device.
1325  *
1326  * On succesful return, any backup DMA buffer pointed to by @res->backup will
1327  * be reserved and validated.
1328  * On hardware resource shortage, this function will repeatedly evict
1329  * resources of the same type until the validation succeeds.
1330  */
1331 int vmw_resource_validate(struct vmw_resource *res)
1332 {
1333         int ret;
1334         struct vmw_resource *evict_res;
1335         struct vmw_private *dev_priv = res->dev_priv;
1336         struct list_head *lru_list = &dev_priv->res_lru[res->func->res_type];
1337         struct ttm_validate_buffer val_buf;
1338         unsigned err_count = 0;
1339
1340         if (likely(!res->func->may_evict))
1341                 return 0;
1342
1343         val_buf.bo = NULL;
1344         if (res->backup)
1345                 val_buf.bo = &res->backup->base;
1346         do {
1347                 ret = vmw_resource_do_validate(res, &val_buf);
1348                 if (likely(ret != -EBUSY))
1349                         break;
1350
1351                 write_lock(&dev_priv->resource_lock);
1352                 if (list_empty(lru_list) || !res->func->may_evict) {
1353                         DRM_ERROR("Out of device device resources "
1354                                   "for %s.\n", res->func->type_name);
1355                         ret = -EBUSY;
1356                         write_unlock(&dev_priv->resource_lock);
1357                         break;
1358                 }
1359
1360                 evict_res = vmw_resource_reference
1361                         (list_first_entry(lru_list, struct vmw_resource,
1362                                           lru_head));
1363                 list_del_init(&evict_res->lru_head);
1364
1365                 write_unlock(&dev_priv->resource_lock);
1366
1367                 ret = vmw_resource_do_evict(evict_res, true);
1368                 if (unlikely(ret != 0)) {
1369                         write_lock(&dev_priv->resource_lock);
1370                         list_add_tail(&evict_res->lru_head, lru_list);
1371                         write_unlock(&dev_priv->resource_lock);
1372                         if (ret == -ERESTARTSYS ||
1373                             ++err_count > VMW_RES_EVICT_ERR_COUNT) {
1374                                 vmw_resource_unreference(&evict_res);
1375                                 goto out_no_validate;
1376                         }
1377                 }
1378
1379                 vmw_resource_unreference(&evict_res);
1380         } while (1);
1381
1382         if (unlikely(ret != 0))
1383                 goto out_no_validate;
1384         else if (!res->func->needs_backup && res->backup) {
1385                 list_del_init(&res->mob_head);
1386                 vmw_dmabuf_unreference(&res->backup);
1387         }
1388
1389         return 0;
1390
1391 out_no_validate:
1392         return ret;
1393 }
1394
1395 /**
1396  * vmw_fence_single_bo - Utility function to fence a single TTM buffer
1397  *                       object without unreserving it.
1398  *
1399  * @bo:             Pointer to the struct ttm_buffer_object to fence.
1400  * @fence:          Pointer to the fence. If NULL, this function will
1401  *                  insert a fence into the command stream..
1402  *
1403  * Contrary to the ttm_eu version of this function, it takes only
1404  * a single buffer object instead of a list, and it also doesn't
1405  * unreserve the buffer object, which needs to be done separately.
1406  */
1407 void vmw_fence_single_bo(struct ttm_buffer_object *bo,
1408                          struct vmw_fence_obj *fence)
1409 {
1410         struct ttm_bo_device *bdev = bo->bdev;
1411         struct ttm_bo_driver *driver = bdev->driver;
1412         struct vmw_fence_obj *old_fence_obj;
1413         struct vmw_private *dev_priv =
1414                 container_of(bdev, struct vmw_private, bdev);
1415
1416         if (fence == NULL)
1417                 vmw_execbuf_fence_commands(NULL, dev_priv, &fence, NULL);
1418         else
1419                 driver->sync_obj_ref(fence);
1420
1421         spin_lock(&bdev->fence_lock);
1422
1423         old_fence_obj = bo->sync_obj;
1424         bo->sync_obj = fence;
1425
1426         spin_unlock(&bdev->fence_lock);
1427
1428         if (old_fence_obj)
1429                 vmw_fence_obj_unreference(&old_fence_obj);
1430 }
1431
1432 /**
1433  * vmw_resource_move_notify - TTM move_notify_callback
1434  *
1435  * @bo:             The TTM buffer object about to move.
1436  * @mem:            The truct ttm_mem_reg indicating to what memory
1437  *                  region the move is taking place.
1438  *
1439  * Evicts the Guest Backed hardware resource if the backup
1440  * buffer is being moved out of MOB memory.
1441  * Note that this function should not race with the resource
1442  * validation code as long as it accesses only members of struct
1443  * resource that remain static while bo::res is !NULL and
1444  * while we have @bo reserved. struct resource::backup is *not* a
1445  * static member. The resource validation code will take care
1446  * to set @bo::res to NULL, while having @bo reserved when the
1447  * buffer is no longer bound to the resource, so @bo:res can be
1448  * used to determine whether there is a need to unbind and whether
1449  * it is safe to unbind.
1450  */
1451 void vmw_resource_move_notify(struct ttm_buffer_object *bo,
1452                               struct ttm_mem_reg *mem)
1453 {
1454         struct vmw_dma_buffer *dma_buf;
1455
1456         if (mem == NULL)
1457                 return;
1458
1459         if (bo->destroy != vmw_dmabuf_bo_free &&
1460             bo->destroy != vmw_user_dmabuf_destroy)
1461                 return;
1462
1463         dma_buf = container_of(bo, struct vmw_dma_buffer, base);
1464
1465         if (mem->mem_type != VMW_PL_MOB) {
1466                 struct vmw_resource *res, *n;
1467                 struct ttm_bo_device *bdev = bo->bdev;
1468                 struct ttm_validate_buffer val_buf;
1469
1470                 val_buf.bo = bo;
1471
1472                 list_for_each_entry_safe(res, n, &dma_buf->res_list, mob_head) {
1473
1474                         if (unlikely(res->func->unbind == NULL))
1475                                 continue;
1476
1477                         (void) res->func->unbind(res, true, &val_buf);
1478                         res->backup_dirty = true;
1479                         res->res_dirty = false;
1480                         list_del_init(&res->mob_head);
1481                 }
1482
1483                 spin_lock(&bdev->fence_lock);
1484                 (void) ttm_bo_wait(bo, false, false, false);
1485                 spin_unlock(&bdev->fence_lock);
1486         }
1487 }
1488
1489 /**
1490  * vmw_resource_needs_backup - Return whether a resource needs a backup buffer.
1491  *
1492  * @res:            The resource being queried.
1493  */
1494 bool vmw_resource_needs_backup(const struct vmw_resource *res)
1495 {
1496         return res->func->needs_backup;
1497 }
1498
1499 /**
1500  * vmw_resource_evict_type - Evict all resources of a specific type
1501  *
1502  * @dev_priv:       Pointer to a device private struct
1503  * @type:           The resource type to evict
1504  *
1505  * To avoid thrashing starvation or as part of the hibernation sequence,
1506  * try to evict all evictable resources of a specific type.
1507  */
1508 static void vmw_resource_evict_type(struct vmw_private *dev_priv,
1509                                     enum vmw_res_type type)
1510 {
1511         struct list_head *lru_list = &dev_priv->res_lru[type];
1512         struct vmw_resource *evict_res;
1513         unsigned err_count = 0;
1514         int ret;
1515
1516         do {
1517                 write_lock(&dev_priv->resource_lock);
1518
1519                 if (list_empty(lru_list))
1520                         goto out_unlock;
1521
1522                 evict_res = vmw_resource_reference(
1523                         list_first_entry(lru_list, struct vmw_resource,
1524                                          lru_head));
1525                 list_del_init(&evict_res->lru_head);
1526                 write_unlock(&dev_priv->resource_lock);
1527
1528                 ret = vmw_resource_do_evict(evict_res, false);
1529                 if (unlikely(ret != 0)) {
1530                         write_lock(&dev_priv->resource_lock);
1531                         list_add_tail(&evict_res->lru_head, lru_list);
1532                         write_unlock(&dev_priv->resource_lock);
1533                         if (++err_count > VMW_RES_EVICT_ERR_COUNT) {
1534                                 vmw_resource_unreference(&evict_res);
1535                                 return;
1536                         }
1537                 }
1538
1539                 vmw_resource_unreference(&evict_res);
1540         } while (1);
1541
1542 out_unlock:
1543         write_unlock(&dev_priv->resource_lock);
1544 }
1545
1546 /**
1547  * vmw_resource_evict_all - Evict all evictable resources
1548  *
1549  * @dev_priv:       Pointer to a device private struct
1550  *
1551  * To avoid thrashing starvation or as part of the hibernation sequence,
1552  * evict all evictable resources. In particular this means that all
1553  * guest-backed resources that are registered with the device are
1554  * evicted and the OTable becomes clean.
1555  */
1556 void vmw_resource_evict_all(struct vmw_private *dev_priv)
1557 {
1558         enum vmw_res_type type;
1559
1560         mutex_lock(&dev_priv->cmdbuf_mutex);
1561
1562         for (type = 0; type < vmw_res_max; ++type)
1563                 vmw_resource_evict_type(dev_priv, type);
1564
1565         mutex_unlock(&dev_priv->cmdbuf_mutex);
1566 }