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#include "i915_drm_winsys.h"
#include "util/u_memory.h"
#include "util/u_atomic.h"
#include "util/u_inlines.h"
/**
* Because gem does not have fence's we have to create our own fences.
*
* They work by keeping the batchbuffer around and checking if that has
* been idled. If bo is NULL fence has expired.
*/
struct i915_drm_fence
{
struct pipe_reference reference;
drm_intel_bo *bo;
};
struct pipe_fence_handle *
i915_drm_fence_create(drm_intel_bo *bo)
{
struct i915_drm_fence *fence = CALLOC_STRUCT(i915_drm_fence);
pipe_reference_init(&fence->reference, 1);
/* bo is null if fence already expired */
if (bo) {
drm_intel_bo_reference(bo);
fence->bo = bo;
}
return (struct pipe_fence_handle *)fence;
}
static void
i915_drm_fence_reference(struct i915_winsys *iws,
struct pipe_fence_handle **ptr,
struct pipe_fence_handle *fence)
{
struct i915_drm_fence *old = (struct i915_drm_fence *)*ptr;
struct i915_drm_fence *f = (struct i915_drm_fence *)fence;
if (pipe_reference(&((struct i915_drm_fence *)(*ptr))->reference, &f->reference)) {
if (old->bo)
drm_intel_bo_unreference(old->bo);
FREE(old);
}
*ptr = fence;
}
static int
i915_drm_fence_signalled(struct i915_winsys *iws,
struct pipe_fence_handle *fence)
{
struct i915_drm_fence *f = (struct i915_drm_fence *)fence;
/* fence already expired */
if (!f->bo)
return 1;
return !drm_intel_bo_busy(f->bo);
}
static int
i915_drm_fence_finish(struct i915_winsys *iws,
struct pipe_fence_handle *fence)
{
struct i915_drm_fence *f = (struct i915_drm_fence *)fence;
/* fence already expired */
if (!f->bo)
return 0;
drm_intel_bo_wait_rendering(f->bo);
drm_intel_bo_unreference(f->bo);
f->bo = NULL;
return 0;
}
void
i915_drm_winsys_init_fence_functions(struct i915_drm_winsys *idws)
{
idws->base.fence_reference = i915_drm_fence_reference;
idws->base.fence_signalled = i915_drm_fence_signalled;
idws->base.fence_finish = i915_drm_fence_finish;
}
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