linux-phytium/include/drm/ttm/ttm_debug.h

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 * Copyright (c) 2017 Advanced Micro Devices, Inc.
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/*
 * Authors: Tom St Denis <tom.stdenis@amd.com>
 */
extern void ttm_trace_dma_map(struct device *dev, struct ttm_dma_tt *tt);
extern void ttm_trace_dma_unmap(struct device *dev, struct ttm_dma_tt *tt);