src/mesa/drivers/dri/i965/intel_buffer_objects.c

   1 /*
   2  * Copyright 2003 VMware, Inc.
   3  * All Rights Reserved.
   4  *
   5  * Permission is hereby granted, free of charge, to any person obtaining a
   6  * copy of this software and associated documentation files (the
   7  * "Software"), to deal in the Software without restriction, including
   8  * without limitation the rights to use, copy, modify, merge, publish,
   9  * distribute, sublicense, and/or sell copies of the Software, and to
  10  * permit persons to whom the Software is furnished to do so, subject to
  11  * the following conditions:
  12  *
  13  * The above copyright notice and this permission notice (including the
  14  * next paragraph) shall be included in all copies or substantial portions
  15  * of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  18  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  19  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
  20  * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
  21  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  22  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  23  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  24  */
  25
  26 /**
  27  * @file intel_buffer_objects.c
  28  *
  29  * This provides core GL buffer object functionality.
  30  */
  31
  32 #include "main/imports.h"
  33 #include "main/mtypes.h"
  34 #include "main/macros.h"
  35 #include "main/bufferobj.h"
  36
  37 #include "brw_context.h"
  38 #include "intel_blit.h"
  39 #include "intel_buffer_objects.h"
  40 #include "intel_batchbuffer.h"
  41
  42 static void
  43 mark_buffer_gpu_usage(struct intel_buffer_object *intel_obj,
  44                                uint32_t offset, uint32_t size)
  45 {
  46    intel_obj->gpu_active_start = MIN2(intel_obj->gpu_active_start, offset);
  47    intel_obj->gpu_active_end = MAX2(intel_obj->gpu_active_end, offset + size);
  48 }
  49
  50 static void
  51 mark_buffer_inactive(struct intel_buffer_object *intel_obj)
  52 {
  53    intel_obj->gpu_active_start = ~0;
  54    intel_obj->gpu_active_end = 0;
  55 }
  56
  57 /** Allocates a new brw_bo to store the data for the buffer object. */
  58 static void
  59 alloc_buffer_object(struct brw_context *brw,
  60                     struct intel_buffer_object *intel_obj)
  61 {
  62    intel_obj->buffer = brw_bo_alloc(brw->bufmgr, "bufferobj",
  63                                           intel_obj->Base.Size, 64);
  64
  65    /* the buffer might be bound as a uniform buffer, need to update it
  66     */
  67    if (intel_obj->Base.UsageHistory & USAGE_UNIFORM_BUFFER)
  68       brw->ctx.NewDriverState |= BRW_NEW_UNIFORM_BUFFER;
  69    if (intel_obj->Base.UsageHistory & USAGE_SHADER_STORAGE_BUFFER)
  70       brw->ctx.NewDriverState |= BRW_NEW_UNIFORM_BUFFER;
  71    if (intel_obj->Base.UsageHistory & USAGE_TEXTURE_BUFFER)
  72       brw->ctx.NewDriverState |= BRW_NEW_TEXTURE_BUFFER;
  73    if (intel_obj->Base.UsageHistory & USAGE_ATOMIC_COUNTER_BUFFER)
  74       brw->ctx.NewDriverState |= BRW_NEW_ATOMIC_BUFFER;
  75
  76    mark_buffer_inactive(intel_obj);
  77 }
  78
  79 static void
  80 release_buffer(struct intel_buffer_object *intel_obj)
  81 {
  82    brw_bo_unreference(intel_obj->buffer);
  83    intel_obj->buffer = NULL;
  84 }
  85
  86 /**
  87  * The NewBufferObject() driver hook.
  88  *
  89  * Allocates a new intel_buffer_object structure and initializes it.
  90  *
  91  * There is some duplication between mesa's bufferobjects and our
  92  * bufmgr buffers.  Both have an integer handle and a hashtable to
  93  * lookup an opaque structure.  It would be nice if the handles and
  94  * internal structure where somehow shared.
  95  */
  96 static struct gl_buffer_object *
  97 brw_new_buffer_object(struct gl_context * ctx, GLuint name)
  98 {
  99    struct intel_buffer_object *obj = CALLOC_STRUCT(intel_buffer_object);
 100    if (!obj) {
 101       _mesa_error_no_memory(__func__);
 102    }
 103
 104    _mesa_initialize_buffer_object(ctx, &obj->Base, name);
 105
 106    obj->buffer = NULL;
 107
 108    return &obj->Base;
 109 }
 110
 111 /**
 112  * The DeleteBuffer() driver hook.
 113  *
 114  * Deletes a single OpenGL buffer object.  Used by glDeleteBuffers().
 115  */
 116 static void
 117 brw_delete_buffer(struct gl_context * ctx, struct gl_buffer_object *obj)
 118 {
 119    struct intel_buffer_object *intel_obj = intel_buffer_object(obj);
 120
 121    assert(intel_obj);
 122
 123    /* Buffer objects are automatically unmapped when deleting according
 124     * to the spec, but Mesa doesn't do UnmapBuffer for us at context destroy
 125     * (though it does if you call glDeleteBuffers)
 126     */
 127    _mesa_buffer_unmap_all_mappings(ctx, obj);
 128
 129    brw_bo_unreference(intel_obj->buffer);
 130    _mesa_delete_buffer_object(ctx, obj);
 131 }
 132
 133
 134 /**
 135  * The BufferData() driver hook.
 136  *
 137  * Implements glBufferData(), which recreates a buffer object's data store
 138  * and populates it with the given data, if present.
 139  *
 140  * Any data that was previously stored in the buffer object is lost.
 141  *
 142  * \return true for success, false if out of memory
 143  */
 144 static GLboolean
 145 brw_buffer_data(struct gl_context *ctx,
 146                 GLenum target,
 147                 GLsizeiptrARB size,
 148                 const GLvoid *data,
 149                 GLenum usage,
 150                 GLbitfield storageFlags,
 151                 struct gl_buffer_object *obj)
 152 {
 153    struct brw_context *brw = brw_context(ctx);
 154    struct intel_buffer_object *intel_obj = intel_buffer_object(obj);
 155
 156    /* Part of the ABI, but this function doesn't use it.
 157     */
 158    (void) target;
 159
 160    intel_obj->Base.Size = size;
 161    intel_obj->Base.Usage = usage;
 162    intel_obj->Base.StorageFlags = storageFlags;
 163
 164    assert(!obj->Mappings[MAP_USER].Pointer); /* Mesa should have unmapped it */
 165    assert(!obj->Mappings[MAP_INTERNAL].Pointer);
 166
 167    if (intel_obj->buffer != NULL)
 168       release_buffer(intel_obj);
 169
 170    if (size != 0) {
 171       alloc_buffer_object(brw, intel_obj);
 172       if (!intel_obj->buffer)
 173          return false;
 174
 175       if (data != NULL)
 176          brw_bo_subdata(intel_obj->buffer, 0, size, data);
 177    }
 178
 179    return true;
 180 }
 181
 182
 183 /**
 184  * The BufferSubData() driver hook.
 185  *
 186  * Implements glBufferSubData(), which replaces a portion of the data in a
 187  * buffer object.
 188  *
 189  * If the data range specified by (size + offset) extends beyond the end of
 190  * the buffer or if data is NULL, no copy is performed.
 191  */
 192 static void
 193 brw_buffer_subdata(struct gl_context *ctx,
 194                    GLintptrARB offset,
 195                    GLsizeiptrARB size,
 196                    const GLvoid *data,
 197                    struct gl_buffer_object *obj)
 198 {
 199    struct brw_context *brw = brw_context(ctx);
 200    struct intel_buffer_object *intel_obj = intel_buffer_object(obj);
 201    bool busy;
 202
 203    if (size == 0)
 204       return;
 205
 206    assert(intel_obj);
 207
 208    /* See if we can unsynchronized write the data into the user's BO. This
 209     * avoids GPU stalls in unfortunately common user patterns (uploading
 210     * sequentially into a BO, with draw calls in between each upload).
 211     *
 212     * Once we've hit this path, we mark this GL BO as preferring stalling to
 213     * blits, so that we can hopefully hit this path again in the future
 214     * (otherwise, an app that might occasionally stall but mostly not will end
 215     * up with blitting all the time, at the cost of bandwidth)
 216     */
 217    if (offset + size <= intel_obj->gpu_active_start ||
 218        intel_obj->gpu_active_end <= offset) {
 219       if (brw->has_llc) {
 220          void *map = brw_bo_map_unsynchronized(brw, intel_obj->buffer);
 221          memcpy(map + offset, data, size);
 222          brw_bo_unmap(intel_obj->buffer);
 223
 224          if (intel_obj->gpu_active_end > intel_obj->gpu_active_start)
 225             intel_obj->prefer_stall_to_blit = true;
 226          return;
 227       } else {
 228          perf_debug("BufferSubData could be unsynchronized, but !LLC doesn't support it yet\n");
 229       }
 230    }
 231
 232    busy =
 233       brw_bo_busy(intel_obj->buffer) ||
 234       brw_batch_references(&brw->batch, intel_obj->buffer);
 235
 236    if (busy) {
 237       if (size == intel_obj->Base.Size) {
 238          /* Replace the current busy bo so the subdata doesn't stall. */
 239          brw_bo_unreference(intel_obj->buffer);
 240          alloc_buffer_object(brw, intel_obj);
 241       } else if (!intel_obj->prefer_stall_to_blit) {
 242          perf_debug("Using a blit copy to avoid stalling on "
 243                     "glBufferSubData(%ld, %ld) (%ldkb) to a busy "
 244                     "(%d-%d) buffer object.\n",
 245                     (long)offset, (long)offset + size, (long)(size/1024),
 246                     intel_obj->gpu_active_start,
 247                     intel_obj->gpu_active_end);
 248          struct brw_bo *temp_bo =
 249             brw_bo_alloc(brw->bufmgr, "subdata temp", size, 64);
 250
 251          brw_bo_subdata(temp_bo, 0, size, data);
 252
 253          intel_emit_linear_blit(brw,
 254                                 intel_obj->buffer, offset,
 255                                 temp_bo, 0,
 256                                 size);
 257
 258          brw_bo_unreference(temp_bo);
 259          return;
 260       } else {
 261          perf_debug("Stalling on glBufferSubData(%ld, %ld) (%ldkb) to a busy "
 262                     "(%d-%d) buffer object.  Use glMapBufferRange() to "
 263                     "avoid this.\n",
 264                     (long)offset, (long)offset + size, (long)(size/1024),
 265                     intel_obj->gpu_active_start,
 266                     intel_obj->gpu_active_end);
 267          intel_batchbuffer_flush(brw);
 268       }
 269    }
 270
 271    brw_bo_subdata(intel_obj->buffer, offset, size, data);
 272    mark_buffer_inactive(intel_obj);
 273 }
 274
 275
 276 /**
 277  * The GetBufferSubData() driver hook.
 278  *
 279  * Implements glGetBufferSubData(), which copies a subrange of a buffer
 280  * object into user memory.
 281  */
 282 static void
 283 brw_get_buffer_subdata(struct gl_context *ctx,
 284                        GLintptrARB offset,
 285                        GLsizeiptrARB size,
 286                        GLvoid *data,
 287                        struct gl_buffer_object *obj)
 288 {
 289    struct intel_buffer_object *intel_obj = intel_buffer_object(obj);
 290    struct brw_context *brw = brw_context(ctx);
 291
 292    assert(intel_obj);
 293    if (brw_batch_references(&brw->batch, intel_obj->buffer)) {
 294       intel_batchbuffer_flush(brw);
 295    }
 296    brw_bo_get_subdata(intel_obj->buffer, offset, size, data);
 297
 298    mark_buffer_inactive(intel_obj);
 299 }
 300
 301
 302 /**
 303  * The MapBufferRange() driver hook.
 304  *
 305  * This implements both glMapBufferRange() and glMapBuffer().
 306  *
 307  * The goal of this extension is to allow apps to accumulate their rendering
 308  * at the same time as they accumulate their buffer object.  Without it,
 309  * you'd end up blocking on execution of rendering every time you mapped
 310  * the buffer to put new data in.
 311  *
 312  * We support it in 3 ways: If unsynchronized, then don't bother
 313  * flushing the batchbuffer before mapping the buffer, which can save blocking
 314  * in many cases.  If we would still block, and they allow the whole buffer
 315  * to be invalidated, then just allocate a new buffer to replace the old one.
 316  * If not, and we'd block, and they allow the subrange of the buffer to be
 317  * invalidated, then we can make a new little BO, let them write into that,
 318  * and blit it into the real BO at unmap time.
 319  */
 320 static void *
 321 brw_map_buffer_range(struct gl_context *ctx,
 322                      GLintptr offset, GLsizeiptr length,
 323                      GLbitfield access, struct gl_buffer_object *obj,
 324                      gl_map_buffer_index index)
 325 {
 326    struct brw_context *brw = brw_context(ctx);
 327    struct intel_buffer_object *intel_obj = intel_buffer_object(obj);
 328
 329    assert(intel_obj);
 330
 331    STATIC_ASSERT(GL_MAP_UNSYNCHRONIZED_BIT == MAP_ASYNC);
 332    STATIC_ASSERT(GL_MAP_WRITE_BIT == MAP_WRITE);
 333    STATIC_ASSERT(GL_MAP_READ_BIT == MAP_READ);
 334    STATIC_ASSERT(GL_MAP_PERSISTENT_BIT == MAP_PERSISTENT);
 335    STATIC_ASSERT(GL_MAP_COHERENT_BIT == MAP_COHERENT);
 336    assert((access & MAP_INTERNAL_MASK) == 0);
 337
 338    /* _mesa_MapBufferRange (GL entrypoint) sets these, but the vbo module also
 339     * internally uses our functions directly.
 340     */
 341    obj->Mappings[index].Offset = offset;
 342    obj->Mappings[index].Length = length;
 343    obj->Mappings[index].AccessFlags = access;
 344
 345    if (intel_obj->buffer == NULL) {
 346       obj->Mappings[index].Pointer = NULL;
 347       return NULL;
 348    }
 349
 350    /* If the access is synchronized (like a normal buffer mapping), then get
 351     * things flushed out so the later mapping syncs appropriately through GEM.
 352     * If the user doesn't care about existing buffer contents and mapping would
 353     * cause us to block, then throw out the old buffer.
 354     *
 355     * If they set INVALIDATE_BUFFER, we can pitch the current contents to
 356     * achieve the required synchronization.
 357     */
 358    if (!(access & GL_MAP_UNSYNCHRONIZED_BIT)) {
 359       if (brw_batch_references(&brw->batch, intel_obj->buffer)) {
 360          if (access & GL_MAP_INVALIDATE_BUFFER_BIT) {
 361             brw_bo_unreference(intel_obj->buffer);
 362             alloc_buffer_object(brw, intel_obj);
 363          } else {
 364             perf_debug("Stalling on the GPU for mapping a busy buffer "
 365                        "object\n");
 366             intel_batchbuffer_flush(brw);
 367          }
 368       } else if (brw_bo_busy(intel_obj->buffer) &&
 369                  (access & GL_MAP_INVALIDATE_BUFFER_BIT)) {
 370          brw_bo_unreference(intel_obj->buffer);
 371          alloc_buffer_object(brw, intel_obj);
 372       }
 373    }
 374
 375    /* If the user is mapping a range of an active buffer object but
 376     * doesn't require the current contents of that range, make a new
 377     * BO, and we'll copy what they put in there out at unmap or
 378     * FlushRange time.
 379     *
 380     * That is, unless they're looking for a persistent mapping -- we would
 381     * need to do blits in the MemoryBarrier call, and it's easier to just do a
 382     * GPU stall and do a mapping.
 383     */
 384    if (!(access & (GL_MAP_UNSYNCHRONIZED_BIT | GL_MAP_PERSISTENT_BIT)) &&
 385        (access & GL_MAP_INVALIDATE_RANGE_BIT) &&
 386        brw_bo_busy(intel_obj->buffer)) {
 387       /* Ensure that the base alignment of the allocation meets the alignment
 388        * guarantees the driver has advertised to the application.
 389        */
 390       const unsigned alignment = ctx->Const.MinMapBufferAlignment;
 391
 392       intel_obj->map_extra[index] = (uintptr_t) offset % alignment;
 393       intel_obj->range_map_bo[index] = brw_bo_alloc(brw->bufmgr,
 394                                                           "BO blit temp",
 395                                                           length +
 396                                                           intel_obj->map_extra[index],
 397                                                           alignment);
 398       void *map = brw_bo_map(brw, intel_obj->range_map_bo[index], access);
 399       obj->Mappings[index].Pointer = map + intel_obj->map_extra[index];
 400       return obj->Mappings[index].Pointer;
 401    }
 402
 403    void *map = brw_bo_map(brw, intel_obj->buffer, access);
 404    if (!(access & GL_MAP_UNSYNCHRONIZED_BIT)) {
 405       mark_buffer_inactive(intel_obj);
 406    }
 407
 408    obj->Mappings[index].Pointer = map + offset;
 409    return obj->Mappings[index].Pointer;
 410 }
 411
 412 /**
 413  * The FlushMappedBufferRange() driver hook.
 414  *
 415  * Implements glFlushMappedBufferRange(), which signifies that modifications
 416  * have been made to a range of a mapped buffer, and it should be flushed.
 417  *
 418  * This is only used for buffers mapped with GL_MAP_FLUSH_EXPLICIT_BIT.
 419  *
 420  * Ideally we'd use a BO to avoid taking up cache space for the temporary
 421  * data, but FlushMappedBufferRange may be followed by further writes to
 422  * the pointer, so we would have to re-map after emitting our blit, which
 423  * would defeat the point.
 424  */
 425 static void
 426 brw_flush_mapped_buffer_range(struct gl_context *ctx,
 427                               GLintptr offset, GLsizeiptr length,
 428                               struct gl_buffer_object *obj,
 429                               gl_map_buffer_index index)
 430 {
 431    struct brw_context *brw = brw_context(ctx);
 432    struct intel_buffer_object *intel_obj = intel_buffer_object(obj);
 433
 434    assert(obj->Mappings[index].AccessFlags & GL_MAP_FLUSH_EXPLICIT_BIT);
 435
 436    /* If we gave a direct mapping of the buffer instead of using a temporary,
 437     * then there's nothing to do.
 438     */
 439    if (intel_obj->range_map_bo[index] == NULL)
 440       return;
 441
 442    if (length == 0)
 443       return;
 444
 445    /* Note that we're not unmapping our buffer while executing the blit.  We
 446     * need to have a mapping still at the end of this call, since the user
 447     * gets to make further modifications and glFlushMappedBufferRange() calls.
 448     * This is safe, because:
 449     *
 450     * - On LLC platforms, we're using a CPU mapping that's coherent with the
 451     *   GPU (except for the render caches), so the kernel doesn't need to do
 452     *   any flushing work for us except for what happens at batch exec time
 453     *   anyway.
 454     *
 455     * - On non-LLC platforms, we're using a GTT mapping that writes directly
 456     *   to system memory (except for the chipset cache that gets flushed at
 457     *   batch exec time).
 458     *
 459     * In both cases we don't need to stall for the previous blit to complete
 460     * so we can re-map (and we definitely don't want to, since that would be
 461     * slow): If the user edits a part of their buffer that's previously been
 462     * blitted, then our lack of synchoronization is fine, because either
 463     * they'll get some too-new data in the first blit and not do another blit
 464     * of that area (but in that case the results are undefined), or they'll do
 465     * another blit of that area and the complete newer data will land the
 466     * second time.
 467     */
 468    intel_emit_linear_blit(brw,
 469                           intel_obj->buffer,
 470                           obj->Mappings[index].Offset + offset,
 471                           intel_obj->range_map_bo[index],
 472                           intel_obj->map_extra[index] + offset,
 473                           length);
 474    mark_buffer_gpu_usage(intel_obj,
 475                          obj->Mappings[index].Offset + offset,
 476                          length);
 477 }
 478
 479
 480 /**
 481  * The UnmapBuffer() driver hook.
 482  *
 483  * Implements glUnmapBuffer().
 484  */
 485 static GLboolean
 486 brw_unmap_buffer(struct gl_context *ctx,
 487                  struct gl_buffer_object *obj,
 488                  gl_map_buffer_index index)
 489 {
 490    struct brw_context *brw = brw_context(ctx);
 491    struct intel_buffer_object *intel_obj = intel_buffer_object(obj);
 492
 493    assert(intel_obj);
 494    assert(obj->Mappings[index].Pointer);
 495    if (intel_obj->range_map_bo[index] != NULL) {
 496       brw_bo_unmap(intel_obj->range_map_bo[index]);
 497
 498       if (!(obj->Mappings[index].AccessFlags & GL_MAP_FLUSH_EXPLICIT_BIT)) {
 499          intel_emit_linear_blit(brw,
 500                                 intel_obj->buffer, obj->Mappings[index].Offset,
 501                                 intel_obj->range_map_bo[index],
 502                                 intel_obj->map_extra[index],
 503                                 obj->Mappings[index].Length);
 504          mark_buffer_gpu_usage(intel_obj, obj->Mappings[index].Offset,
 505                                obj->Mappings[index].Length);
 506       }
 507
 508       /* Since we've emitted some blits to buffers that will (likely) be used
 509        * in rendering operations in other cache domains in this batch, emit a
 510        * flush.  Once again, we wish for a domain tracker in libdrm to cover
 511        * usage inside of a batchbuffer.
 512        */
 513       brw_emit_mi_flush(brw);
 514
 515       brw_bo_unreference(intel_obj->range_map_bo[index]);
 516       intel_obj->range_map_bo[index] = NULL;
 517    } else if (intel_obj->buffer != NULL) {
 518       brw_bo_unmap(intel_obj->buffer);
 519    }
 520    obj->Mappings[index].Pointer = NULL;
 521    obj->Mappings[index].Offset = 0;
 522    obj->Mappings[index].Length = 0;
 523
 524    return true;
 525 }
 526
 527 /**
 528  * Gets a pointer to the object's BO, and marks the given range as being used
 529  * on the GPU.
 530  *
 531  * Anywhere that uses buffer objects in the pipeline should be using this to
 532  * mark the range of the buffer that is being accessed by the pipeline.
 533  */
 534 struct brw_bo *
 535 intel_bufferobj_buffer(struct brw_context *brw,
 536                        struct intel_buffer_object *intel_obj,
 537                        uint32_t offset, uint32_t size)
 538 {
 539    /* This is needed so that things like transform feedback and texture buffer
 540     * objects that need a BO but don't want to check that they exist for
 541     * draw-time validation can just always get a BO from a GL buffer object.
 542     */
 543    if (intel_obj->buffer == NULL)
 544       alloc_buffer_object(brw, intel_obj);
 545
 546    mark_buffer_gpu_usage(intel_obj, offset, size);
 547
 548    return intel_obj->buffer;
 549 }
 550
 551 /**
 552  * The CopyBufferSubData() driver hook.
 553  *
 554  * Implements glCopyBufferSubData(), which copies a portion of one buffer
 555  * object's data to another.  Independent source and destination offsets
 556  * are allowed.
 557  */
 558 static void
 559 brw_copy_buffer_subdata(struct gl_context *ctx,
 560                         struct gl_buffer_object *src,
 561                         struct gl_buffer_object *dst,
 562                         GLintptr read_offset, GLintptr write_offset,
 563                         GLsizeiptr size)
 564 {
 565    struct brw_context *brw = brw_context(ctx);
 566    struct intel_buffer_object *intel_src = intel_buffer_object(src);
 567    struct intel_buffer_object *intel_dst = intel_buffer_object(dst);
 568    struct brw_bo *src_bo, *dst_bo;
 569
 570    if (size == 0)
 571       return;
 572
 573    dst_bo = intel_bufferobj_buffer(brw, intel_dst, write_offset, size);
 574    src_bo = intel_bufferobj_buffer(brw, intel_src, read_offset, size);
 575
 576    intel_emit_linear_blit(brw,
 577                           dst_bo, write_offset,
 578                           src_bo, read_offset, size);
 579
 580    /* Since we've emitted some blits to buffers that will (likely) be used
 581     * in rendering operations in other cache domains in this batch, emit a
 582     * flush.  Once again, we wish for a domain tracker in libdrm to cover
 583     * usage inside of a batchbuffer.
 584     */
 585    brw_emit_mi_flush(brw);
 586 }
 587
 588 void
 589 intelInitBufferObjectFuncs(struct dd_function_table *functions)
 590 {
 591    functions->NewBufferObject = brw_new_buffer_object;
 592    functions->DeleteBuffer = brw_delete_buffer;
 593    functions->BufferData = brw_buffer_data;
 594    functions->BufferSubData = brw_buffer_subdata;
 595    functions->GetBufferSubData = brw_get_buffer_subdata;
 596    functions->MapBufferRange = brw_map_buffer_range;
 597    functions->FlushMappedBufferRange = brw_flush_mapped_buffer_range;
 598    functions->UnmapBuffer = brw_unmap_buffer;
 599    functions->CopyBufferSubData = brw_copy_buffer_subdata;
 600 }