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/*
* Copyright © 2008 Intel Corporation
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*
* Authors:
* Eric Anholt <eric@anholt.net>
*
*/
/** @file intel_syncobj.c
*
* Support for ARB_sync
*
* ARB_sync is implemented by flushing the current batchbuffer and keeping a
* reference on it. We can then check for completion or wait for completion
* using the normal buffer object mechanisms. This does mean that if an
* application is using many sync objects, it will emit small batchbuffers
* which may end up being a significant overhead. In other tests of removing
* gratuitous batchbuffer syncs in Mesa, it hasn't appeared to be a significant
* performance bottleneck, though.
*/
#include "main/imports.h"
#include "brw_context.h"
#include "intel_batchbuffer.h"
#include "intel_reg.h"
static struct gl_sync_object *
intel_new_sync_object(struct gl_context *ctx, GLuint id)
{
struct intel_sync_object *sync;
sync = calloc(1, sizeof(struct intel_sync_object));
return &sync->Base;
}
static void
intel_delete_sync_object(struct gl_context *ctx, struct gl_sync_object *s)
{
struct intel_sync_object *sync = (struct intel_sync_object *)s;
drm_intel_bo_unreference(sync->bo);
free(sync);
}
static void
intel_fence_sync(struct gl_context *ctx, struct gl_sync_object *s,
GLenum condition, GLbitfield flags)
{
struct brw_context *brw = brw_context(ctx);
struct intel_sync_object *sync = (struct intel_sync_object *)s;
assert(condition == GL_SYNC_GPU_COMMANDS_COMPLETE);
intel_batchbuffer_emit_mi_flush(brw);
sync->bo = brw->batch.bo;
drm_intel_bo_reference(sync->bo);
intel_batchbuffer_flush(brw);
}
static void intel_client_wait_sync(struct gl_context *ctx, struct gl_sync_object *s,
GLbitfield flags, GLuint64 timeout)
{
struct intel_sync_object *sync = (struct intel_sync_object *)s;
/* DRM_IOCTL_I915_GEM_WAIT uses a signed 64 bit timeout and returns
* immediately for timeouts <= 0. The best we can do is to clamp the
* timeout to INT64_MAX. This limits the maximum timeout from 584 years to
* 292 years - likely not a big deal.
*/
if (timeout > INT64_MAX)
timeout = INT64_MAX;
if (sync->bo && drm_intel_gem_bo_wait(sync->bo, timeout) == 0) {
s->StatusFlag = 1;
drm_intel_bo_unreference(sync->bo);
sync->bo = NULL;
}
}
/* We have nothing to do for WaitSync. Our GL command stream is sequential,
* so given that the sync object has already flushed the batchbuffer,
* any batchbuffers coming after this waitsync will naturally not occur until
* the previous one is done.
*/
static void intel_server_wait_sync(struct gl_context *ctx, struct gl_sync_object *s,
GLbitfield flags, GLuint64 timeout)
{
}
static void intel_check_sync(struct gl_context *ctx, struct gl_sync_object *s)
{
struct intel_sync_object *sync = (struct intel_sync_object *)s;
if (sync->bo && !drm_intel_bo_busy(sync->bo)) {
drm_intel_bo_unreference(sync->bo);
sync->bo = NULL;
s->StatusFlag = 1;
}
}
void intel_init_syncobj_functions(struct dd_function_table *functions)
{
functions->NewSyncObject = intel_new_sync_object;
functions->DeleteSyncObject = intel_delete_sync_object;
functions->FenceSync = intel_fence_sync;
functions->CheckSync = intel_check_sync;
functions->ClientWaitSync = intel_client_wait_sync;
functions->ServerWaitSync = intel_server_wait_sync;
}
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