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  1. /*
  2.  * Copyright © 2008 Intel Corporation
  3.  *
  4.  * Permission is hereby granted, free of charge, to any person obtaining a
  5.  * copy of this software and associated documentation files (the "Software"),
  6.  * to deal in the Software without restriction, including without limitation
  7.  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  8.  * and/or sell copies of the Software, and to permit persons to whom the
  9.  * Software is furnished to do so, subject to the following conditions:
  10.  *
  11.  * The above copyright notice and this permission notice (including the next
  12.  * paragraph) shall be included in all copies or substantial portions of the
  13.  * Software.
  14.  *
  15.  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16.  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17.  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18.  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19.  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20.  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  21.  * IN THE SOFTWARE.
  22.  *
  23.  * Authors:
  24.  *    Eric Anholt <eric@anholt.net>
  25.  *
  26.  */
  27.  
  28. /** @file intel_syncobj.c
  29.  *
  30.  * Support for ARB_sync
  31.  *
  32.  * ARB_sync is implemented by flushing the current batchbuffer and keeping a
  33.  * reference on it.  We can then check for completion or wait for completion
  34.  * using the normal buffer object mechanisms.  This does mean that if an
  35.  * application is using many sync objects, it will emit small batchbuffers
  36.  * which may end up being a significant overhead.  In other tests of removing
  37.  * gratuitous batchbuffer syncs in Mesa, it hasn't appeared to be a significant
  38.  * performance bottleneck, though.
  39.  */
  40.  
  41. #include "main/simple_list.h"
  42. #include "main/imports.h"
  43.  
  44. #include "intel_context.h"
  45. #include "intel_batchbuffer.h"
  46. #include "intel_reg.h"
  47.  
  48. static struct gl_sync_object *
  49. intel_new_sync_object(struct gl_context *ctx, GLuint id)
  50. {
  51.    struct intel_sync_object *sync;
  52.  
  53.    sync = calloc(1, sizeof(struct intel_sync_object));
  54.  
  55.    return &sync->Base;
  56. }
  57.  
  58. static void
  59. intel_delete_sync_object(struct gl_context *ctx, struct gl_sync_object *s)
  60. {
  61.    struct intel_sync_object *sync = (struct intel_sync_object *)s;
  62.  
  63.    drm_intel_bo_unreference(sync->bo);
  64.    free(sync);
  65. }
  66.  
  67. static void
  68. intel_fence_sync(struct gl_context *ctx, struct gl_sync_object *s,
  69.                GLenum condition, GLbitfield flags)
  70. {
  71.    struct intel_context *intel = intel_context(ctx);
  72.    struct intel_sync_object *sync = (struct intel_sync_object *)s;
  73.  
  74.    assert(condition == GL_SYNC_GPU_COMMANDS_COMPLETE);
  75.    intel_batchbuffer_emit_mi_flush(intel);
  76.  
  77.    sync->bo = intel->batch.bo;
  78.    drm_intel_bo_reference(sync->bo);
  79.  
  80.    intel_flush(ctx);
  81. }
  82.  
  83. static void intel_client_wait_sync(struct gl_context *ctx, struct gl_sync_object *s,
  84.                                  GLbitfield flags, GLuint64 timeout)
  85. {
  86.    struct intel_sync_object *sync = (struct intel_sync_object *)s;
  87.  
  88.    if (sync->bo && drm_intel_gem_bo_wait(sync->bo, timeout) == 0) {
  89.       s->StatusFlag = 1;
  90.       drm_intel_bo_unreference(sync->bo);
  91.       sync->bo = NULL;
  92.    }
  93. }
  94.  
  95. /* We have nothing to do for WaitSync.  Our GL command stream is sequential,
  96.  * so given that the sync object has already flushed the batchbuffer,
  97.  * any batchbuffers coming after this waitsync will naturally not occur until
  98.  * the previous one is done.
  99.  */
  100. static void intel_server_wait_sync(struct gl_context *ctx, struct gl_sync_object *s,
  101.                                  GLbitfield flags, GLuint64 timeout)
  102. {
  103. }
  104.  
  105. static void intel_check_sync(struct gl_context *ctx, struct gl_sync_object *s)
  106. {
  107.    struct intel_sync_object *sync = (struct intel_sync_object *)s;
  108.  
  109.    if (sync->bo && !drm_intel_bo_busy(sync->bo)) {
  110.       drm_intel_bo_unreference(sync->bo);
  111.       sync->bo = NULL;
  112.       s->StatusFlag = 1;
  113.    }
  114. }
  115.  
  116. void intel_init_syncobj_functions(struct dd_function_table *functions)
  117. {
  118.    functions->NewSyncObject = intel_new_sync_object;
  119.    functions->DeleteSyncObject = intel_delete_sync_object;
  120.    functions->FenceSync = intel_fence_sync;
  121.    functions->CheckSync = intel_check_sync;
  122.    functions->ClientWaitSync = intel_client_wait_sync;
  123.    functions->ServerWaitSync = intel_server_wait_sync;
  124. }
  125.