kernel/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 struct vmw_resource *
  92 vmw_resource_reference_unless_doomed(struct vmw_resource *res)
  93 {
  94         return kref_get_unless_zero(&res->kref) ? res : NULL;
  95 }
  96
  97 /**
  98  * vmw_resource_release_id - release a resource id to the id manager.
  99  *
 100  * @res: Pointer to the resource.
 101  *
 102  * Release the resource id to the resource id manager and set it to -1
 103  */
 104 void vmw_resource_release_id(struct vmw_resource *res)
 105 {
 106         struct vmw_private *dev_priv = res->dev_priv;
 107         struct idr *idr = &dev_priv->res_idr[res->func->res_type];
 108
 109         write_lock(&dev_priv->resource_lock);
 110         if (res->id != -1)
 111                 idr_remove(idr, res->id);
 112         res->id = -1;
 113         write_unlock(&dev_priv->resource_lock);
 114 }
 115
 116 static void vmw_resource_release(struct kref *kref)
 117 {
 118         struct vmw_resource *res =
 119             container_of(kref, struct vmw_resource, kref);
 120         struct vmw_private *dev_priv = res->dev_priv;
 121         int id;
 122         struct idr *idr = &dev_priv->res_idr[res->func->res_type];
 123
 124         res->avail = false;
 125         list_del_init(&res->lru_head);
 126         write_unlock(&dev_priv->resource_lock);
 127         if (res->backup) {
 128                 struct ttm_buffer_object *bo = &res->backup->base;
 129
 130                 ttm_bo_reserve(bo, false, false, false, NULL);
 131                 if (!list_empty(&res->mob_head) &&
 132                     res->func->unbind != NULL) {
 133                         struct ttm_validate_buffer val_buf;
 134
 135                         val_buf.bo = bo;
 136                         val_buf.shared = false;
 137                         res->func->unbind(res, false, &val_buf);
 138                 }
 139                 res->backup_dirty = false;
 140                 list_del_init(&res->mob_head);
 141                 ttm_bo_unreserve(bo);
 142                 vmw_dmabuf_unreference(&res->backup);
 143         }
 144
 145         if (likely(res->hw_destroy != NULL)) {
 146                 res->hw_destroy(res);
 147                 mutex_lock(&dev_priv->binding_mutex);
 148                 vmw_context_binding_res_list_kill(&res->binding_head);
 149                 mutex_unlock(&dev_priv->binding_mutex);
 150         }
 151
 152         id = res->id;
 153         if (res->res_free != NULL)
 154                 res->res_free(res);
 155         else
 156                 kfree(res);
 157
 158         write_lock(&dev_priv->resource_lock);
 159
 160         if (id != -1)
 161                 idr_remove(idr, id);
 162 }
 163
 164 void vmw_resource_unreference(struct vmw_resource **p_res)
 165 {
 166         struct vmw_resource *res = *p_res;
 167         struct vmw_private *dev_priv = res->dev_priv;
 168
 169         *p_res = NULL;
 170         write_lock(&dev_priv->resource_lock);
 171         kref_put(&res->kref, vmw_resource_release);
 172         write_unlock(&dev_priv->resource_lock);
 173 }
 174
 175
 176 /**
 177  * vmw_resource_alloc_id - release a resource id to the id manager.
 178  *
 179  * @res: Pointer to the resource.
 180  *
 181  * Allocate the lowest free resource from the resource manager, and set
 182  * @res->id to that id. Returns 0 on success and -ENOMEM on failure.
 183  */
 184 int vmw_resource_alloc_id(struct vmw_resource *res)
 185 {
 186         struct vmw_private *dev_priv = res->dev_priv;
 187         int ret;
 188         struct idr *idr = &dev_priv->res_idr[res->func->res_type];
 189
 190         BUG_ON(res->id != -1);
 191
 192         idr_preload(GFP_KERNEL);
 193         write_lock(&dev_priv->resource_lock);
 194
 195         ret = idr_alloc(idr, res, 1, 0, GFP_NOWAIT);
 196         if (ret >= 0)
 197                 res->id = ret;
 198
 199         write_unlock(&dev_priv->resource_lock);
 200         idr_preload_end();
 201         return ret < 0 ? ret : 0;
 202 }
 203
 204 /**
 205  * vmw_resource_init - initialize a struct vmw_resource
 206  *
 207  * @dev_priv:       Pointer to a device private struct.
 208  * @res:            The struct vmw_resource to initialize.
 209  * @obj_type:       Resource object type.
 210  * @delay_id:       Boolean whether to defer device id allocation until
 211  *                  the first validation.
 212  * @res_free:       Resource destructor.
 213  * @func:           Resource function table.
 214  */
 215 int vmw_resource_init(struct vmw_private *dev_priv, struct vmw_resource *res,
 216                       bool delay_id,
 217                       void (*res_free) (struct vmw_resource *res),
 218                       const struct vmw_res_func *func)
 219 {
 220         kref_init(&res->kref);
 221         res->hw_destroy = NULL;
 222         res->res_free = res_free;
 223         res->avail = false;
 224         res->dev_priv = dev_priv;
 225         res->func = func;
 226         INIT_LIST_HEAD(&res->lru_head);
 227         INIT_LIST_HEAD(&res->mob_head);
 228         INIT_LIST_HEAD(&res->binding_head);
 229         res->id = -1;
 230         res->backup = NULL;
 231         res->backup_offset = 0;
 232         res->backup_dirty = false;
 233         res->res_dirty = false;
 234         if (delay_id)
 235                 return 0;
 236         else
 237                 return vmw_resource_alloc_id(res);
 238 }
 239
 240 /**
 241  * vmw_resource_activate
 242  *
 243  * @res:        Pointer to the newly created resource
 244  * @hw_destroy: Destroy function. NULL if none.
 245  *
 246  * Activate a resource after the hardware has been made aware of it.
 247  * Set tye destroy function to @destroy. Typically this frees the
 248  * resource and destroys the hardware resources associated with it.
 249  * Activate basically means that the function vmw_resource_lookup will
 250  * find it.
 251  */
 252 void vmw_resource_activate(struct vmw_resource *res,
 253                            void (*hw_destroy) (struct vmw_resource *))
 254 {
 255         struct vmw_private *dev_priv = res->dev_priv;
 256
 257         write_lock(&dev_priv->resource_lock);
 258         res->avail = true;
 259         res->hw_destroy = hw_destroy;
 260         write_unlock(&dev_priv->resource_lock);
 261 }
 262
 263 struct vmw_resource *vmw_resource_lookup(struct vmw_private *dev_priv,
 264                                          struct idr *idr, int id)
 265 {
 266         struct vmw_resource *res;
 267
 268         read_lock(&dev_priv->resource_lock);
 269         res = idr_find(idr, id);
 270         if (res && res->avail)
 271                 kref_get(&res->kref);
 272         else
 273                 res = NULL;
 274         read_unlock(&dev_priv->resource_lock);
 275
 276         if (unlikely(res == NULL))
 277                 return NULL;
 278
 279         return res;
 280 }
 281
 282 /**
 283  * vmw_user_resource_lookup_handle - lookup a struct resource from a
 284  * TTM user-space handle and perform basic type checks
 285  *
 286  * @dev_priv:     Pointer to a device private struct
 287  * @tfile:        Pointer to a struct ttm_object_file identifying the caller
 288  * @handle:       The TTM user-space handle
 289  * @converter:    Pointer to an object describing the resource type
 290  * @p_res:        On successful return the location pointed to will contain
 291  *                a pointer to a refcounted struct vmw_resource.
 292  *
 293  * If the handle can't be found or is associated with an incorrect resource
 294  * type, -EINVAL will be returned.
 295  */
 296 int vmw_user_resource_lookup_handle(struct vmw_private *dev_priv,
 297                                     struct ttm_object_file *tfile,
 298                                     uint32_t handle,
 299                                     const struct vmw_user_resource_conv
 300                                     *converter,
 301                                     struct vmw_resource **p_res)
 302 {
 303         struct ttm_base_object *base;
 304         struct vmw_resource *res;
 305         int ret = -EINVAL;
 306
 307         base = ttm_base_object_lookup(tfile, handle);
 308         if (unlikely(base == NULL))
 309                 return -EINVAL;
 310
 311         if (unlikely(ttm_base_object_type(base) != converter->object_type))
 312                 goto out_bad_resource;
 313
 314         res = converter->base_obj_to_res(base);
 315
 316         read_lock(&dev_priv->resource_lock);
 317         if (!res->avail || res->res_free != converter->res_free) {
 318                 read_unlock(&dev_priv->resource_lock);
 319                 goto out_bad_resource;
 320         }
 321
 322         kref_get(&res->kref);
 323         read_unlock(&dev_priv->resource_lock);
 324
 325         *p_res = res;
 326         ret = 0;
 327
 328 out_bad_resource:
 329         ttm_base_object_unref(&base);
 330
 331         return ret;
 332 }
 333
 334 /**
 335  * Helper function that looks either a surface or dmabuf.
 336  *
 337  * The pointer this pointed at by out_surf and out_buf needs to be null.
 338  */
 339 int vmw_user_lookup_handle(struct vmw_private *dev_priv,
 340                            struct ttm_object_file *tfile,
 341                            uint32_t handle,
 342                            struct vmw_surface **out_surf,
 343                            struct vmw_dma_buffer **out_buf)
 344 {
 345         struct vmw_resource *res;
 346         int ret;
 347
 348         BUG_ON(*out_surf || *out_buf);
 349
 350         ret = vmw_user_resource_lookup_handle(dev_priv, tfile, handle,
 351                                               user_surface_converter,
 352                                               &res);
 353         if (!ret) {
 354                 *out_surf = vmw_res_to_srf(res);
 355                 return 0;
 356         }
 357
 358         *out_surf = NULL;
 359         ret = vmw_user_dmabuf_lookup(tfile, handle, out_buf);
 360         return ret;
 361 }
 362
 363 /**
 364  * Buffer management.
 365  */
 366
 367 /**
 368  * vmw_dmabuf_acc_size - Calculate the pinned memory usage of buffers
 369  *
 370  * @dev_priv: Pointer to a struct vmw_private identifying the device.
 371  * @size: The requested buffer size.
 372  * @user: Whether this is an ordinary dma buffer or a user dma buffer.
 373  */
 374 static size_t vmw_dmabuf_acc_size(struct vmw_private *dev_priv, size_t size,
 375                                   bool user)
 376 {
 377         static size_t struct_size, user_struct_size;
 378         size_t num_pages = PAGE_ALIGN(size) >> PAGE_SHIFT;
 379         size_t page_array_size = ttm_round_pot(num_pages * sizeof(void *));
 380
 381         if (unlikely(struct_size == 0)) {
 382                 size_t backend_size = ttm_round_pot(vmw_tt_size);
 383
 384                 struct_size = backend_size +
 385                         ttm_round_pot(sizeof(struct vmw_dma_buffer));
 386                 user_struct_size = backend_size +
 387                         ttm_round_pot(sizeof(struct vmw_user_dma_buffer));
 388         }
 389
 390         if (dev_priv->map_mode == vmw_dma_alloc_coherent)
 391                 page_array_size +=
 392                         ttm_round_pot(num_pages * sizeof(dma_addr_t));
 393
 394         return ((user) ? user_struct_size : struct_size) +
 395                 page_array_size;
 396 }
 397
 398 void vmw_dmabuf_bo_free(struct ttm_buffer_object *bo)
 399 {
 400         struct vmw_dma_buffer *vmw_bo = vmw_dma_buffer(bo);
 401
 402         kfree(vmw_bo);
 403 }
 404
 405 static void vmw_user_dmabuf_destroy(struct ttm_buffer_object *bo)
 406 {
 407         struct vmw_user_dma_buffer *vmw_user_bo = vmw_user_dma_buffer(bo);
 408
 409         ttm_prime_object_kfree(vmw_user_bo, prime);
 410 }
 411
 412 int vmw_dmabuf_init(struct vmw_private *dev_priv,
 413                     struct vmw_dma_buffer *vmw_bo,
 414                     size_t size, struct ttm_placement *placement,
 415                     bool interruptible,
 416                     void (*bo_free) (struct ttm_buffer_object *bo))
 417 {
 418         struct ttm_bo_device *bdev = &dev_priv->bdev;
 419         size_t acc_size;
 420         int ret;
 421         bool user = (bo_free == &vmw_user_dmabuf_destroy);
 422
 423         BUG_ON(!bo_free && (!user && (bo_free != vmw_dmabuf_bo_free)));
 424
 425         acc_size = vmw_dmabuf_acc_size(dev_priv, size, user);
 426         memset(vmw_bo, 0, sizeof(*vmw_bo));
 427
 428         INIT_LIST_HEAD(&vmw_bo->res_list);
 429
 430         ret = ttm_bo_init(bdev, &vmw_bo->base, size,
 431                           ttm_bo_type_device, placement,
 432                           0, interruptible,
 433                           NULL, acc_size, NULL, NULL, bo_free);
 434         return ret;
 435 }
 436
 437 static void vmw_user_dmabuf_release(struct ttm_base_object **p_base)
 438 {
 439         struct vmw_user_dma_buffer *vmw_user_bo;
 440         struct ttm_base_object *base = *p_base;
 441         struct ttm_buffer_object *bo;
 442
 443         *p_base = NULL;
 444
 445         if (unlikely(base == NULL))
 446                 return;
 447
 448         vmw_user_bo = container_of(base, struct vmw_user_dma_buffer,
 449                                    prime.base);
 450         bo = &vmw_user_bo->dma.base;
 451         ttm_bo_unref(&bo);
 452 }
 453
 454 static void vmw_user_dmabuf_ref_obj_release(struct ttm_base_object *base,
 455                                             enum ttm_ref_type ref_type)
 456 {
 457         struct vmw_user_dma_buffer *user_bo;
 458         user_bo = container_of(base, struct vmw_user_dma_buffer, prime.base);
 459
 460         switch (ref_type) {
 461         case TTM_REF_SYNCCPU_WRITE:
 462                 ttm_bo_synccpu_write_release(&user_bo->dma.base);
 463                 break;
 464         default:
 465                 BUG();
 466         }
 467 }
 468
 469 /**
 470  * vmw_user_dmabuf_alloc - Allocate a user dma buffer
 471  *
 472  * @dev_priv: Pointer to a struct device private.
 473  * @tfile: Pointer to a struct ttm_object_file on which to register the user
 474  * object.
 475  * @size: Size of the dma buffer.
 476  * @shareable: Boolean whether the buffer is shareable with other open files.
 477  * @handle: Pointer to where the handle value should be assigned.
 478  * @p_dma_buf: Pointer to where the refcounted struct vmw_dma_buffer pointer
 479  * should be assigned.
 480  */
 481 int vmw_user_dmabuf_alloc(struct vmw_private *dev_priv,
 482                           struct ttm_object_file *tfile,
 483                           uint32_t size,
 484                           bool shareable,
 485                           uint32_t *handle,
 486                           struct vmw_dma_buffer **p_dma_buf)
 487 {
 488         struct vmw_user_dma_buffer *user_bo;
 489         struct ttm_buffer_object *tmp;
 490         int ret;
 491
 492         user_bo = kzalloc(sizeof(*user_bo), GFP_KERNEL);
 493         if (unlikely(user_bo == NULL)) {
 494                 DRM_ERROR("Failed to allocate a buffer.\n");
 495                 return -ENOMEM;
 496         }
 497
 498         ret = vmw_dmabuf_init(dev_priv, &user_bo->dma, size,
 499                               (dev_priv->has_mob) ?
 500                               &vmw_sys_placement :
 501                               &vmw_vram_sys_placement, true,
 502                               &vmw_user_dmabuf_destroy);
 503         if (unlikely(ret != 0))
 504                 return ret;
 505
 506         tmp = ttm_bo_reference(&user_bo->dma.base);
 507         ret = ttm_prime_object_init(tfile,
 508                                     size,
 509                                     &user_bo->prime,
 510                                     shareable,
 511                                     ttm_buffer_type,
 512                                     &vmw_user_dmabuf_release,
 513                                     &vmw_user_dmabuf_ref_obj_release);
 514         if (unlikely(ret != 0)) {
 515                 ttm_bo_unref(&tmp);
 516                 goto out_no_base_object;
 517         }
 518
 519         *p_dma_buf = &user_bo->dma;
 520         *handle = user_bo->prime.base.hash.key;
 521
 522 out_no_base_object:
 523         return ret;
 524 }
 525
 526 /**
 527  * vmw_user_dmabuf_verify_access - verify access permissions on this
 528  * buffer object.
 529  *
 530  * @bo: Pointer to the buffer object being accessed
 531  * @tfile: Identifying the caller.
 532  */
 533 int vmw_user_dmabuf_verify_access(struct ttm_buffer_object *bo,
 534                                   struct ttm_object_file *tfile)
 535 {
 536         struct vmw_user_dma_buffer *vmw_user_bo;
 537
 538         if (unlikely(bo->destroy != vmw_user_dmabuf_destroy))
 539                 return -EPERM;
 540
 541         vmw_user_bo = vmw_user_dma_buffer(bo);
 542
 543         /* Check that the caller has opened the object. */
 544         if (likely(ttm_ref_object_exists(tfile, &vmw_user_bo->prime.base)))
 545                 return 0;
 546
 547         DRM_ERROR("Could not grant buffer access.\n");
 548         return -EPERM;
 549 }
 550
 551 /**
 552  * vmw_user_dmabuf_synccpu_grab - Grab a struct vmw_user_dma_buffer for cpu
 553  * access, idling previous GPU operations on the buffer and optionally
 554  * blocking it for further command submissions.
 555  *
 556  * @user_bo: Pointer to the buffer object being grabbed for CPU access
 557  * @tfile: Identifying the caller.
 558  * @flags: Flags indicating how the grab should be performed.
 559  *
 560  * A blocking grab will be automatically released when @tfile is closed.
 561  */
 562 static int vmw_user_dmabuf_synccpu_grab(struct vmw_user_dma_buffer *user_bo,
 563                                         struct ttm_object_file *tfile,
 564                                         uint32_t flags)
 565 {
 566         struct ttm_buffer_object *bo = &user_bo->dma.base;
 567         bool existed;
 568         int ret;
 569
 570         if (flags & drm_vmw_synccpu_allow_cs) {
 571                 bool nonblock = !!(flags & drm_vmw_synccpu_dontblock);
 572                 long lret;
 573
 574                 if (nonblock)
 575                         return reservation_object_test_signaled_rcu(bo->resv, true) ? 0 : -EBUSY;
 576
 577                 lret = reservation_object_wait_timeout_rcu(bo->resv, true, true, MAX_SCHEDULE_TIMEOUT);
 578                 if (!lret)
 579                         return -EBUSY;
 580                 else if (lret < 0)
 581                         return lret;
 582                 return 0;
 583         }
 584
 585         ret = ttm_bo_synccpu_write_grab
 586                 (bo, !!(flags & drm_vmw_synccpu_dontblock));
 587         if (unlikely(ret != 0))
 588                 return ret;
 589
 590         ret = ttm_ref_object_add(tfile, &user_bo->prime.base,
 591                                  TTM_REF_SYNCCPU_WRITE, &existed);
 592         if (ret != 0 || existed)
 593                 ttm_bo_synccpu_write_release(&user_bo->dma.base);
 594
 595         return ret;
 596 }
 597
 598 /**
 599  * vmw_user_dmabuf_synccpu_release - Release a previous grab for CPU access,
 600  * and unblock command submission on the buffer if blocked.
 601  *
 602  * @handle: Handle identifying the buffer object.
 603  * @tfile: Identifying the caller.
 604  * @flags: Flags indicating the type of release.
 605  */
 606 static int vmw_user_dmabuf_synccpu_release(uint32_t handle,
 607                                            struct ttm_object_file *tfile,
 608                                            uint32_t flags)
 609 {
 610         if (!(flags & drm_vmw_synccpu_allow_cs))
 611                 return ttm_ref_object_base_unref(tfile, handle,
 612                                                  TTM_REF_SYNCCPU_WRITE);
 613
 614         return 0;
 615 }
 616
 617 /**
 618  * vmw_user_dmabuf_synccpu_release - ioctl function implementing the synccpu
 619  * functionality.
 620  *
 621  * @dev: Identifies the drm device.
 622  * @data: Pointer to the ioctl argument.
 623  * @file_priv: Identifies the caller.
 624  *
 625  * This function checks the ioctl arguments for validity and calls the
 626  * relevant synccpu functions.
 627  */
 628 int vmw_user_dmabuf_synccpu_ioctl(struct drm_device *dev, void *data,
 629                                   struct drm_file *file_priv)
 630 {
 631         struct drm_vmw_synccpu_arg *arg =
 632                 (struct drm_vmw_synccpu_arg *) data;
 633         struct vmw_dma_buffer *dma_buf;
 634         struct vmw_user_dma_buffer *user_bo;
 635         struct ttm_object_file *tfile = vmw_fpriv(file_priv)->tfile;
 636         int ret;
 637
 638         if ((arg->flags & (drm_vmw_synccpu_read | drm_vmw_synccpu_write)) == 0
 639             || (arg->flags & ~(drm_vmw_synccpu_read | drm_vmw_synccpu_write |
 640                                drm_vmw_synccpu_dontblock |
 641                                drm_vmw_synccpu_allow_cs)) != 0) {
 642                 DRM_ERROR("Illegal synccpu flags.\n");
 643                 return -EINVAL;
 644         }
 645
 646         switch (arg->op) {
 647         case drm_vmw_synccpu_grab:
 648                 ret = vmw_user_dmabuf_lookup(tfile, arg->handle, &dma_buf);
 649                 if (unlikely(ret != 0))
 650                         return ret;
 651
 652                 user_bo = container_of(dma_buf, struct vmw_user_dma_buffer,
 653                                        dma);
 654                 ret = vmw_user_dmabuf_synccpu_grab(user_bo, tfile, arg->flags);
 655                 vmw_dmabuf_unreference(&dma_buf);
 656                 if (unlikely(ret != 0 && ret != -ERESTARTSYS &&
 657                              ret != -EBUSY)) {
 658                         DRM_ERROR("Failed synccpu grab on handle 0x%08x.\n",
 659                                   (unsigned int) arg->handle);
 660                         return ret;
 661                 }
 662                 break;
 663         case drm_vmw_synccpu_release:
 664                 ret = vmw_user_dmabuf_synccpu_release(arg->handle, tfile,
 665                                                       arg->flags);
 666                 if (unlikely(ret != 0)) {
 667                         DRM_ERROR("Failed synccpu release on handle 0x%08x.\n",
 668                                   (unsigned int) arg->handle);
 669                         return ret;
 670                 }
 671                 break;
 672         default:
 673                 DRM_ERROR("Invalid synccpu operation.\n");
 674                 return -EINVAL;
 675         }
 676
 677         return 0;
 678 }
 679
 680 int vmw_dmabuf_alloc_ioctl(struct drm_device *dev, void *data,
 681                            struct drm_file *file_priv)
 682 {
 683         struct vmw_private *dev_priv = vmw_priv(dev);
 684         union drm_vmw_alloc_dmabuf_arg *arg =
 685             (union drm_vmw_alloc_dmabuf_arg *)data;
 686         struct drm_vmw_alloc_dmabuf_req *req = &arg->req;
 687         struct drm_vmw_dmabuf_rep *rep = &arg->rep;
 688         struct vmw_dma_buffer *dma_buf;
 689         uint32_t handle;
 690         int ret;
 691
 692         ret = ttm_read_lock(&dev_priv->reservation_sem, true);
 693         if (unlikely(ret != 0))
 694                 return ret;
 695
 696         ret = vmw_user_dmabuf_alloc(dev_priv, vmw_fpriv(file_priv)->tfile,
 697                                     req->size, false, &handle, &dma_buf);
 698         if (unlikely(ret != 0))
 699                 goto out_no_dmabuf;
 700
 701         rep->handle = handle;
 702         rep->map_handle = drm_vma_node_offset_addr(&dma_buf->base.vma_node);
 703         rep->cur_gmr_id = handle;
 704         rep->cur_gmr_offset = 0;
 705
 706         vmw_dmabuf_unreference(&dma_buf);
 707
 708 out_no_dmabuf:
 709         ttm_read_unlock(&dev_priv->reservation_sem);
 710
 711         return ret;
 712 }
 713
 714 int vmw_dmabuf_unref_ioctl(struct drm_device *dev, void *data,
 715                            struct drm_file *file_priv)
 716 {
 717         struct drm_vmw_unref_dmabuf_arg *arg =
 718             (struct drm_vmw_unref_dmabuf_arg *)data;
 719
 720         return ttm_ref_object_base_unref(vmw_fpriv(file_priv)->tfile,
 721                                          arg->handle,
 722                                          TTM_REF_USAGE);
 723 }
 724
 725 int vmw_user_dmabuf_lookup(struct ttm_object_file *tfile,
 726                            uint32_t handle, struct vmw_dma_buffer **out)
 727 {
 728         struct vmw_user_dma_buffer *vmw_user_bo;
 729         struct ttm_base_object *base;
 730
 731         base = ttm_base_object_lookup(tfile, handle);
 732         if (unlikely(base == NULL)) {
 733                 printk(KERN_ERR "Invalid buffer object handle 0x%08lx.\n",
 734                        (unsigned long)handle);
 735                 return -ESRCH;
 736         }
 737
 738         if (unlikely(ttm_base_object_type(base) != ttm_buffer_type)) {
 739                 ttm_base_object_unref(&base);
 740                 printk(KERN_ERR "Invalid buffer object handle 0x%08lx.\n",
 741                        (unsigned long)handle);
 742                 return -EINVAL;
 743         }
 744
 745         vmw_user_bo = container_of(base, struct vmw_user_dma_buffer,
 746                                    prime.base);
 747         (void)ttm_bo_reference(&vmw_user_bo->dma.base);
 748         ttm_base_object_unref(&base);
 749         *out = &vmw_user_bo->dma;
 750
 751         return 0;
 752 }
 753
 754 int vmw_user_dmabuf_reference(struct ttm_object_file *tfile,
 755                               struct vmw_dma_buffer *dma_buf,
 756                               uint32_t *handle)
 757 {
 758         struct vmw_user_dma_buffer *user_bo;
 759
 760         if (dma_buf->base.destroy != vmw_user_dmabuf_destroy)
 761                 return -EINVAL;
 762
 763         user_bo = container_of(dma_buf, struct vmw_user_dma_buffer, dma);
 764
 765         *handle = user_bo->prime.base.hash.key;
 766         return ttm_ref_object_add(tfile, &user_bo->prime.base,
 767                                   TTM_REF_USAGE, NULL);
 768 }
 769
 770 /*
 771  * Stream management
 772  */
 773
 774 static void vmw_stream_destroy(struct vmw_resource *res)
 775 {
 776         struct vmw_private *dev_priv = res->dev_priv;
 777         struct vmw_stream *stream;
 778         int ret;
 779
 780         DRM_INFO("%s: unref\n", __func__);
 781         stream = container_of(res, struct vmw_stream, res);
 782
 783         ret = vmw_overlay_unref(dev_priv, stream->stream_id);
 784         WARN_ON(ret != 0);
 785 }
 786
 787 static int vmw_stream_init(struct vmw_private *dev_priv,
 788                            struct vmw_stream *stream,
 789                            void (*res_free) (struct vmw_resource *res))
 790 {
 791         struct vmw_resource *res = &stream->res;
 792         int ret;
 793
 794         ret = vmw_resource_init(dev_priv, res, false, res_free,
 795                                 &vmw_stream_func);
 796
 797         if (unlikely(ret != 0)) {
 798                 if (res_free == NULL)
 799                         kfree(stream);
 800                 else
 801                         res_free(&stream->res);
 802                 return ret;
 803         }
 804
 805         ret = vmw_overlay_claim(dev_priv, &stream->stream_id);
 806         if (ret) {
 807                 vmw_resource_unreference(&res);
 808                 return ret;
 809         }
 810
 811         DRM_INFO("%s: claimed\n", __func__);
 812
 813         vmw_resource_activate(&stream->res, vmw_stream_destroy);
 814         return 0;
 815 }
 816
 817 static void vmw_user_stream_free(struct vmw_resource *res)
 818 {
 819         struct vmw_user_stream *stream =
 820             container_of(res, struct vmw_user_stream, stream.res);
 821         struct vmw_private *dev_priv = res->dev_priv;
 822
 823         ttm_base_object_kfree(stream, base);
 824         ttm_mem_global_free(vmw_mem_glob(dev_priv),
 825                             vmw_user_stream_size);
 826 }
 827
 828 /**
 829  * This function is called when user space has no more references on the
 830  * base object. It releases the base-object's reference on the resource object.
 831  */
 832
 833 static void vmw_user_stream_base_release(struct ttm_base_object **p_base)
 834 {
 835         struct ttm_base_object *base = *p_base;
 836         struct vmw_user_stream *stream =
 837             container_of(base, struct vmw_user_stream, base);
 838         struct vmw_resource *res = &stream->stream.res;
 839
 840         *p_base = NULL;
 841         vmw_resource_unreference(&res);
 842 }
 843
 844 int vmw_stream_unref_ioctl(struct drm_device *dev, void *data,
 845                            struct drm_file *file_priv)
 846 {
 847         struct vmw_private *dev_priv = vmw_priv(dev);
 848         struct vmw_resource *res;
 849         struct vmw_user_stream *stream;
 850         struct drm_vmw_stream_arg *arg = (struct drm_vmw_stream_arg *)data;
 851         struct ttm_object_file *tfile = vmw_fpriv(file_priv)->tfile;
 852         struct idr *idr = &dev_priv->res_idr[vmw_res_stream];
 853         int ret = 0;
 854
 855
 856         res = vmw_resource_lookup(dev_priv, idr, arg->stream_id);
 857         if (unlikely(res == NULL))
 858                 return -EINVAL;
 859
 860         if (res->res_free != &vmw_user_stream_free) {
 861                 ret = -EINVAL;
 862                 goto out;
 863         }
 864
 865         stream = container_of(res, struct vmw_user_stream, stream.res);
 866         if (stream->base.tfile != tfile) {
 867                 ret = -EINVAL;
 868                 goto out;
 869         }
 870
 871         ttm_ref_object_base_unref(tfile, stream->base.hash.key, TTM_REF_USAGE);
 872 out:
 873         vmw_resource_unreference(&res);
 874         return ret;
 875 }
 876
 877 int vmw_stream_claim_ioctl(struct drm_device *dev, void *data,
 878                            struct drm_file *file_priv)
 879 {
 880         struct vmw_private *dev_priv = vmw_priv(dev);
 881         struct vmw_user_stream *stream;
 882         struct vmw_resource *res;
 883         struct vmw_resource *tmp;
 884         struct drm_vmw_stream_arg *arg = (struct drm_vmw_stream_arg *)data;
 885         struct ttm_object_file *tfile = vmw_fpriv(file_priv)->tfile;
 886         int ret;
 887
 888         /*
 889          * Approximate idr memory usage with 128 bytes. It will be limited
 890          * by maximum number_of streams anyway?
 891          */
 892
 893         if (unlikely(vmw_user_stream_size == 0))
 894                 vmw_user_stream_size = ttm_round_pot(sizeof(*stream)) + 128;
 895
 896         ret = ttm_read_lock(&dev_priv->reservation_sem, true);
 897         if (unlikely(ret != 0))
 898                 return ret;
 899
 900         ret = ttm_mem_global_alloc(vmw_mem_glob(dev_priv),
 901                                    vmw_user_stream_size,
 902                                    false, true);
 903         if (unlikely(ret != 0)) {
 904                 if (ret != -ERESTARTSYS)
 905                         DRM_ERROR("Out of graphics memory for stream"
 906                                   " creation.\n");
 907                 goto out_unlock;
 908         }
 909
 910
 911         stream = kmalloc(sizeof(*stream), GFP_KERNEL);
 912         if (unlikely(stream == NULL)) {
 913                 ttm_mem_global_free(vmw_mem_glob(dev_priv),
 914                                     vmw_user_stream_size);
 915                 ret = -ENOMEM;
 916                 goto out_unlock;
 917         }
 918
 919         res = &stream->stream.res;
 920         stream->base.shareable = false;
 921         stream->base.tfile = NULL;
 922
 923         /*
 924          * From here on, the destructor takes over resource freeing.
 925          */
 926
 927         ret = vmw_stream_init(dev_priv, &stream->stream, vmw_user_stream_free);
 928         if (unlikely(ret != 0))
 929                 goto out_unlock;
 930
 931         tmp = vmw_resource_reference(res);
 932         ret = ttm_base_object_init(tfile, &stream->base, false, VMW_RES_STREAM,
 933                                    &vmw_user_stream_base_release, NULL);
 934
 935         if (unlikely(ret != 0)) {
 936                 vmw_resource_unreference(&tmp);
 937                 goto out_err;
 938         }
 939
 940         arg->stream_id = res->id;
 941 out_err:
 942         vmw_resource_unreference(&res);
 943 out_unlock:
 944         ttm_read_unlock(&dev_priv->reservation_sem);
 945         return ret;
 946 }
 947
 948 int vmw_user_stream_lookup(struct vmw_private *dev_priv,
 949                            struct ttm_object_file *tfile,
 950                            uint32_t *inout_id, struct vmw_resource **out)
 951 {
 952         struct vmw_user_stream *stream;
 953         struct vmw_resource *res;
 954         int ret;
 955
 956         res = vmw_resource_lookup(dev_priv, &dev_priv->res_idr[vmw_res_stream],
 957                                   *inout_id);
 958         if (unlikely(res == NULL))
 959                 return -EINVAL;
 960
 961         if (res->res_free != &vmw_user_stream_free) {
 962                 ret = -EINVAL;
 963                 goto err_ref;
 964         }
 965
 966         stream = container_of(res, struct vmw_user_stream, stream.res);
 967         if (stream->base.tfile != tfile) {
 968                 ret = -EPERM;
 969                 goto err_ref;
 970         }
 971
 972         *inout_id = stream->stream.stream_id;
 973         *out = res;
 974         return 0;
 975 err_ref:
 976         vmw_resource_unreference(&res);
 977         return ret;
 978 }
 979
 980
 981 /**
 982  * vmw_dumb_create - Create a dumb kms buffer
 983  *
 984  * @file_priv: Pointer to a struct drm_file identifying the caller.
 985  * @dev: Pointer to the drm device.
 986  * @args: Pointer to a struct drm_mode_create_dumb structure
 987  *
 988  * This is a driver callback for the core drm create_dumb functionality.
 989  * Note that this is very similar to the vmw_dmabuf_alloc ioctl, except
 990  * that the arguments have a different format.
 991  */
 992 int vmw_dumb_create(struct drm_file *file_priv,
 993                     struct drm_device *dev,
 994                     struct drm_mode_create_dumb *args)
 995 {
 996         struct vmw_private *dev_priv = vmw_priv(dev);
 997         struct vmw_dma_buffer *dma_buf;
 998         int ret;
 999
1000         args->pitch = args->width * ((args->bpp + 7) / 8);
1001         args->size = args->pitch * args->height;
1002
1003         ret = ttm_read_lock(&dev_priv->reservation_sem, true);
1004         if (unlikely(ret != 0))
1005                 return ret;
1006
1007         ret = vmw_user_dmabuf_alloc(dev_priv, vmw_fpriv(file_priv)->tfile,
1008                                     args->size, false, &args->handle,
1009                                     &dma_buf);
1010         if (unlikely(ret != 0))
1011                 goto out_no_dmabuf;
1012
1013         vmw_dmabuf_unreference(&dma_buf);
1014 out_no_dmabuf:
1015         ttm_read_unlock(&dev_priv->reservation_sem);
1016         return ret;
1017 }
1018
1019 /**
1020  * vmw_dumb_map_offset - Return the address space offset of a dumb buffer
1021  *
1022  * @file_priv: Pointer to a struct drm_file identifying the caller.
1023  * @dev: Pointer to the drm device.
1024  * @handle: Handle identifying the dumb buffer.
1025  * @offset: The address space offset returned.
1026  *
1027  * This is a driver callback for the core drm dumb_map_offset functionality.
1028  */
1029 int vmw_dumb_map_offset(struct drm_file *file_priv,
1030                         struct drm_device *dev, uint32_t handle,
1031                         uint64_t *offset)
1032 {
1033         struct ttm_object_file *tfile = vmw_fpriv(file_priv)->tfile;
1034         struct vmw_dma_buffer *out_buf;
1035         int ret;
1036
1037         ret = vmw_user_dmabuf_lookup(tfile, handle, &out_buf);
1038         if (ret != 0)
1039                 return -EINVAL;
1040
1041         *offset = drm_vma_node_offset_addr(&out_buf->base.vma_node);
1042         vmw_dmabuf_unreference(&out_buf);
1043         return 0;
1044 }
1045
1046 /**
1047  * vmw_dumb_destroy - Destroy a dumb boffer
1048  *
1049  * @file_priv: Pointer to a struct drm_file identifying the caller.
1050  * @dev: Pointer to the drm device.
1051  * @handle: Handle identifying the dumb buffer.
1052  *
1053  * This is a driver callback for the core drm dumb_destroy functionality.
1054  */
1055 int vmw_dumb_destroy(struct drm_file *file_priv,
1056                      struct drm_device *dev,
1057                      uint32_t handle)
1058 {
1059         return ttm_ref_object_base_unref(vmw_fpriv(file_priv)->tfile,
1060                                          handle, TTM_REF_USAGE);
1061 }
1062
1063 /**
1064  * vmw_resource_buf_alloc - Allocate a backup buffer for a resource.
1065  *
1066  * @res:            The resource for which to allocate a backup buffer.
1067  * @interruptible:  Whether any sleeps during allocation should be
1068  *                  performed while interruptible.
1069  */
1070 static int vmw_resource_buf_alloc(struct vmw_resource *res,
1071                                   bool interruptible)
1072 {
1073         unsigned long size =
1074                 (res->backup_size + PAGE_SIZE - 1) & PAGE_MASK;
1075         struct vmw_dma_buffer *backup;
1076         int ret;
1077
1078         if (likely(res->backup)) {
1079                 BUG_ON(res->backup->base.num_pages * PAGE_SIZE < size);
1080                 return 0;
1081         }
1082
1083         backup = kzalloc(sizeof(*backup), GFP_KERNEL);
1084         if (unlikely(backup == NULL))
1085                 return -ENOMEM;
1086
1087         ret = vmw_dmabuf_init(res->dev_priv, backup, res->backup_size,
1088                               res->func->backup_placement,
1089                               interruptible,
1090                               &vmw_dmabuf_bo_free);
1091         if (unlikely(ret != 0))
1092                 goto out_no_dmabuf;
1093
1094         res->backup = backup;
1095
1096 out_no_dmabuf:
1097         return ret;
1098 }
1099
1100 /**
1101  * vmw_resource_do_validate - Make a resource up-to-date and visible
1102  *                            to the device.
1103  *
1104  * @res:            The resource to make visible to the device.
1105  * @val_buf:        Information about a buffer possibly
1106  *                  containing backup data if a bind operation is needed.
1107  *
1108  * On hardware resource shortage, this function returns -EBUSY and
1109  * should be retried once resources have been freed up.
1110  */
1111 static int vmw_resource_do_validate(struct vmw_resource *res,
1112                                     struct ttm_validate_buffer *val_buf)
1113 {
1114         int ret = 0;
1115         const struct vmw_res_func *func = res->func;
1116
1117         if (unlikely(res->id == -1)) {
1118                 ret = func->create(res);
1119                 if (unlikely(ret != 0))
1120                         return ret;
1121         }
1122
1123         if (func->bind &&
1124             ((func->needs_backup && list_empty(&res->mob_head) &&
1125               val_buf->bo != NULL) ||
1126              (!func->needs_backup && val_buf->bo != NULL))) {
1127                 ret = func->bind(res, val_buf);
1128                 if (unlikely(ret != 0))
1129                         goto out_bind_failed;
1130                 if (func->needs_backup)
1131                         list_add_tail(&res->mob_head, &res->backup->res_list);
1132         }
1133
1134         /*
1135          * Only do this on write operations, and move to
1136          * vmw_resource_unreserve if it can be called after
1137          * backup buffers have been unreserved. Otherwise
1138          * sort out locking.
1139          */
1140         res->res_dirty = true;
1141
1142         return 0;
1143
1144 out_bind_failed:
1145         func->destroy(res);
1146
1147         return ret;
1148 }
1149
1150 /**
1151  * vmw_resource_unreserve - Unreserve a resource previously reserved for
1152  * command submission.
1153  *
1154  * @res:               Pointer to the struct vmw_resource to unreserve.
1155  * @new_backup:        Pointer to new backup buffer if command submission
1156  *                     switched.
1157  * @new_backup_offset: New backup offset if @new_backup is !NULL.
1158  *
1159  * Currently unreserving a resource means putting it back on the device's
1160  * resource lru list, so that it can be evicted if necessary.
1161  */
1162 void vmw_resource_unreserve(struct vmw_resource *res,
1163                             struct vmw_dma_buffer *new_backup,
1164                             unsigned long new_backup_offset)
1165 {
1166         struct vmw_private *dev_priv = res->dev_priv;
1167
1168         if (!list_empty(&res->lru_head))
1169                 return;
1170
1171         if (new_backup && new_backup != res->backup) {
1172
1173                 if (res->backup) {
1174                         lockdep_assert_held(&res->backup->base.resv->lock.base);
1175                         list_del_init(&res->mob_head);
1176                         vmw_dmabuf_unreference(&res->backup);
1177                 }
1178
1179                 res->backup = vmw_dmabuf_reference(new_backup);
1180                 lockdep_assert_held(&new_backup->base.resv->lock.base);
1181                 list_add_tail(&res->mob_head, &new_backup->res_list);
1182         }
1183         if (new_backup)
1184                 res->backup_offset = new_backup_offset;
1185
1186         if (!res->func->may_evict || res->id == -1)
1187                 return;
1188
1189         write_lock(&dev_priv->resource_lock);
1190         list_add_tail(&res->lru_head,
1191                       &res->dev_priv->res_lru[res->func->res_type]);
1192         write_unlock(&dev_priv->resource_lock);
1193 }
1194
1195 /**
1196  * vmw_resource_check_buffer - Check whether a backup buffer is needed
1197  *                             for a resource and in that case, allocate
1198  *                             one, reserve and validate it.
1199  *
1200  * @res:            The resource for which to allocate a backup buffer.
1201  * @interruptible:  Whether any sleeps during allocation should be
1202  *                  performed while interruptible.
1203  * @val_buf:        On successful return contains data about the
1204  *                  reserved and validated backup buffer.
1205  */
1206 static int
1207 vmw_resource_check_buffer(struct vmw_resource *res,
1208                           bool interruptible,
1209                           struct ttm_validate_buffer *val_buf)
1210 {
1211         struct list_head val_list;
1212         bool backup_dirty = false;
1213         int ret;
1214
1215         if (unlikely(res->backup == NULL)) {
1216                 ret = vmw_resource_buf_alloc(res, interruptible);
1217                 if (unlikely(ret != 0))
1218                         return ret;
1219         }
1220
1221         INIT_LIST_HEAD(&val_list);
1222         val_buf->bo = ttm_bo_reference(&res->backup->base);
1223         val_buf->shared = false;
1224         list_add_tail(&val_buf->head, &val_list);
1225         ret = ttm_eu_reserve_buffers(NULL, &val_list, interruptible, NULL);
1226         if (unlikely(ret != 0))
1227                 goto out_no_reserve;
1228
1229         if (res->func->needs_backup && list_empty(&res->mob_head))
1230                 return 0;
1231
1232         backup_dirty = res->backup_dirty;
1233         ret = ttm_bo_validate(&res->backup->base,
1234                               res->func->backup_placement,
1235                               true, false);
1236
1237         if (unlikely(ret != 0))
1238                 goto out_no_validate;
1239
1240         return 0;
1241
1242 out_no_validate:
1243         ttm_eu_backoff_reservation(NULL, &val_list);
1244 out_no_reserve:
1245         ttm_bo_unref(&val_buf->bo);
1246         if (backup_dirty)
1247                 vmw_dmabuf_unreference(&res->backup);
1248
1249         return ret;
1250 }
1251
1252 /**
1253  * vmw_resource_reserve - Reserve a resource for command submission
1254  *
1255  * @res:            The resource to reserve.
1256  *
1257  * This function takes the resource off the LRU list and make sure
1258  * a backup buffer is present for guest-backed resources. However,
1259  * the buffer may not be bound to the resource at this point.
1260  *
1261  */
1262 int vmw_resource_reserve(struct vmw_resource *res, bool no_backup)
1263 {
1264         struct vmw_private *dev_priv = res->dev_priv;
1265         int ret;
1266
1267         write_lock(&dev_priv->resource_lock);
1268         list_del_init(&res->lru_head);
1269         write_unlock(&dev_priv->resource_lock);
1270
1271         if (res->func->needs_backup && res->backup == NULL &&
1272             !no_backup) {
1273                 ret = vmw_resource_buf_alloc(res, true);
1274                 if (unlikely(ret != 0))
1275                         return ret;
1276         }
1277
1278         return 0;
1279 }
1280
1281 /**
1282  * vmw_resource_backoff_reservation - Unreserve and unreference a
1283  *                                    backup buffer
1284  *.
1285  * @val_buf:        Backup buffer information.
1286  */
1287 static void
1288 vmw_resource_backoff_reservation(struct ttm_validate_buffer *val_buf)
1289 {
1290         struct list_head val_list;
1291
1292         if (likely(val_buf->bo == NULL))
1293                 return;
1294
1295         INIT_LIST_HEAD(&val_list);
1296         list_add_tail(&val_buf->head, &val_list);
1297         ttm_eu_backoff_reservation(NULL, &val_list);
1298         ttm_bo_unref(&val_buf->bo);
1299 }
1300
1301 /**
1302  * vmw_resource_do_evict - Evict a resource, and transfer its data
1303  *                         to a backup buffer.
1304  *
1305  * @res:            The resource to evict.
1306  * @interruptible:  Whether to wait interruptible.
1307  */
1308 int vmw_resource_do_evict(struct vmw_resource *res, bool interruptible)
1309 {
1310         struct ttm_validate_buffer val_buf;
1311         const struct vmw_res_func *func = res->func;
1312         int ret;
1313
1314         BUG_ON(!func->may_evict);
1315
1316         val_buf.bo = NULL;
1317         val_buf.shared = false;
1318         ret = vmw_resource_check_buffer(res, interruptible, &val_buf);
1319         if (unlikely(ret != 0))
1320                 return ret;
1321
1322         if (unlikely(func->unbind != NULL &&
1323                      (!func->needs_backup || !list_empty(&res->mob_head)))) {
1324                 ret = func->unbind(res, res->res_dirty, &val_buf);
1325                 if (unlikely(ret != 0))
1326                         goto out_no_unbind;
1327                 list_del_init(&res->mob_head);
1328         }
1329         ret = func->destroy(res);
1330         res->backup_dirty = true;
1331         res->res_dirty = false;
1332 out_no_unbind:
1333         vmw_resource_backoff_reservation(&val_buf);
1334
1335         return ret;
1336 }
1337
1338
1339 /**
1340  * vmw_resource_validate - Make a resource up-to-date and visible
1341  *                         to the device.
1342  *
1343  * @res:            The resource to make visible to the device.
1344  *
1345  * On succesful return, any backup DMA buffer pointed to by @res->backup will
1346  * be reserved and validated.
1347  * On hardware resource shortage, this function will repeatedly evict
1348  * resources of the same type until the validation succeeds.
1349  */
1350 int vmw_resource_validate(struct vmw_resource *res)
1351 {
1352         int ret;
1353         struct vmw_resource *evict_res;
1354         struct vmw_private *dev_priv = res->dev_priv;
1355         struct list_head *lru_list = &dev_priv->res_lru[res->func->res_type];
1356         struct ttm_validate_buffer val_buf;
1357         unsigned err_count = 0;
1358
1359         if (likely(!res->func->may_evict))
1360                 return 0;
1361
1362         val_buf.bo = NULL;
1363         val_buf.shared = false;
1364         if (res->backup)
1365                 val_buf.bo = &res->backup->base;
1366         do {
1367                 ret = vmw_resource_do_validate(res, &val_buf);
1368                 if (likely(ret != -EBUSY))
1369                         break;
1370
1371                 write_lock(&dev_priv->resource_lock);
1372                 if (list_empty(lru_list) || !res->func->may_evict) {
1373                         DRM_ERROR("Out of device device resources "
1374                                   "for %s.\n", res->func->type_name);
1375                         ret = -EBUSY;
1376                         write_unlock(&dev_priv->resource_lock);
1377                         break;
1378                 }
1379
1380                 evict_res = vmw_resource_reference
1381                         (list_first_entry(lru_list, struct vmw_resource,
1382                                           lru_head));
1383                 list_del_init(&evict_res->lru_head);
1384
1385                 write_unlock(&dev_priv->resource_lock);
1386
1387                 ret = vmw_resource_do_evict(evict_res, true);
1388                 if (unlikely(ret != 0)) {
1389                         write_lock(&dev_priv->resource_lock);
1390                         list_add_tail(&evict_res->lru_head, lru_list);
1391                         write_unlock(&dev_priv->resource_lock);
1392                         if (ret == -ERESTARTSYS ||
1393                             ++err_count > VMW_RES_EVICT_ERR_COUNT) {
1394                                 vmw_resource_unreference(&evict_res);
1395                                 goto out_no_validate;
1396                         }
1397                 }
1398
1399                 vmw_resource_unreference(&evict_res);
1400         } while (1);
1401
1402         if (unlikely(ret != 0))
1403                 goto out_no_validate;
1404         else if (!res->func->needs_backup && res->backup) {
1405                 list_del_init(&res->mob_head);
1406                 vmw_dmabuf_unreference(&res->backup);
1407         }
1408
1409         return 0;
1410
1411 out_no_validate:
1412         return ret;
1413 }
1414
1415 /**
1416  * vmw_fence_single_bo - Utility function to fence a single TTM buffer
1417  *                       object without unreserving it.
1418  *
1419  * @bo:             Pointer to the struct ttm_buffer_object to fence.
1420  * @fence:          Pointer to the fence. If NULL, this function will
1421  *                  insert a fence into the command stream..
1422  *
1423  * Contrary to the ttm_eu version of this function, it takes only
1424  * a single buffer object instead of a list, and it also doesn't
1425  * unreserve the buffer object, which needs to be done separately.
1426  */
1427 void vmw_fence_single_bo(struct ttm_buffer_object *bo,
1428                          struct vmw_fence_obj *fence)
1429 {
1430         struct ttm_bo_device *bdev = bo->bdev;
1431
1432         struct vmw_private *dev_priv =
1433                 container_of(bdev, struct vmw_private, bdev);
1434
1435         if (fence == NULL) {
1436                 vmw_execbuf_fence_commands(NULL, dev_priv, &fence, NULL);
1437                 reservation_object_add_excl_fence(bo->resv, &fence->base);
1438                 fence_put(&fence->base);
1439         } else
1440                 reservation_object_add_excl_fence(bo->resv, &fence->base);
1441 }
1442
1443 /**
1444  * vmw_resource_move_notify - TTM move_notify_callback
1445  *
1446  * @bo:             The TTM buffer object about to move.
1447  * @mem:            The truct ttm_mem_reg indicating to what memory
1448  *                  region the move is taking place.
1449  *
1450  * Evicts the Guest Backed hardware resource if the backup
1451  * buffer is being moved out of MOB memory.
1452  * Note that this function should not race with the resource
1453  * validation code as long as it accesses only members of struct
1454  * resource that remain static while bo::res is !NULL and
1455  * while we have @bo reserved. struct resource::backup is *not* a
1456  * static member. The resource validation code will take care
1457  * to set @bo::res to NULL, while having @bo reserved when the
1458  * buffer is no longer bound to the resource, so @bo:res can be
1459  * used to determine whether there is a need to unbind and whether
1460  * it is safe to unbind.
1461  */
1462 void vmw_resource_move_notify(struct ttm_buffer_object *bo,
1463                               struct ttm_mem_reg *mem)
1464 {
1465         struct vmw_dma_buffer *dma_buf;
1466
1467         if (mem == NULL)
1468                 return;
1469
1470         if (bo->destroy != vmw_dmabuf_bo_free &&
1471             bo->destroy != vmw_user_dmabuf_destroy)
1472                 return;
1473
1474         dma_buf = container_of(bo, struct vmw_dma_buffer, base);
1475
1476         if (mem->mem_type != VMW_PL_MOB) {
1477                 struct vmw_resource *res, *n;
1478                 struct ttm_validate_buffer val_buf;
1479
1480                 val_buf.bo = bo;
1481                 val_buf.shared = false;
1482
1483                 list_for_each_entry_safe(res, n, &dma_buf->res_list, mob_head) {
1484
1485                         if (unlikely(res->func->unbind == NULL))
1486                                 continue;
1487
1488                         (void) res->func->unbind(res, true, &val_buf);
1489                         res->backup_dirty = true;
1490                         res->res_dirty = false;
1491                         list_del_init(&res->mob_head);
1492                 }
1493
1494                 (void) ttm_bo_wait(bo, false, false, false);
1495         }
1496 }
1497
1498 /**
1499  * vmw_resource_needs_backup - Return whether a resource needs a backup buffer.
1500  *
1501  * @res:            The resource being queried.
1502  */
1503 bool vmw_resource_needs_backup(const struct vmw_resource *res)
1504 {
1505         return res->func->needs_backup;
1506 }
1507
1508 /**
1509  * vmw_resource_evict_type - Evict all resources of a specific type
1510  *
1511  * @dev_priv:       Pointer to a device private struct
1512  * @type:           The resource type to evict
1513  *
1514  * To avoid thrashing starvation or as part of the hibernation sequence,
1515  * try to evict all evictable resources of a specific type.
1516  */
1517 static void vmw_resource_evict_type(struct vmw_private *dev_priv,
1518                                     enum vmw_res_type type)
1519 {
1520         struct list_head *lru_list = &dev_priv->res_lru[type];
1521         struct vmw_resource *evict_res;
1522         unsigned err_count = 0;
1523         int ret;
1524
1525         do {
1526                 write_lock(&dev_priv->resource_lock);
1527
1528                 if (list_empty(lru_list))
1529                         goto out_unlock;
1530
1531                 evict_res = vmw_resource_reference(
1532                         list_first_entry(lru_list, struct vmw_resource,
1533                                          lru_head));
1534                 list_del_init(&evict_res->lru_head);
1535                 write_unlock(&dev_priv->resource_lock);
1536
1537                 ret = vmw_resource_do_evict(evict_res, false);
1538                 if (unlikely(ret != 0)) {
1539                         write_lock(&dev_priv->resource_lock);
1540                         list_add_tail(&evict_res->lru_head, lru_list);
1541                         write_unlock(&dev_priv->resource_lock);
1542                         if (++err_count > VMW_RES_EVICT_ERR_COUNT) {
1543                                 vmw_resource_unreference(&evict_res);
1544                                 return;
1545                         }
1546                 }
1547
1548                 vmw_resource_unreference(&evict_res);
1549         } while (1);
1550
1551 out_unlock:
1552         write_unlock(&dev_priv->resource_lock);
1553 }
1554
1555 /**
1556  * vmw_resource_evict_all - Evict all evictable resources
1557  *
1558  * @dev_priv:       Pointer to a device private struct
1559  *
1560  * To avoid thrashing starvation or as part of the hibernation sequence,
1561  * evict all evictable resources. In particular this means that all
1562  * guest-backed resources that are registered with the device are
1563  * evicted and the OTable becomes clean.
1564  */
1565 void vmw_resource_evict_all(struct vmw_private *dev_priv)
1566 {
1567         enum vmw_res_type type;
1568
1569         mutex_lock(&dev_priv->cmdbuf_mutex);
1570
1571         for (type = 0; type < vmw_res_max; ++type)
1572                 vmw_resource_evict_type(dev_priv, type);
1573
1574         mutex_unlock(&dev_priv->cmdbuf_mutex);
1575 }