36514da674
This patch try to fix this issue by caching the dma-buf attachments and stores the cache list to dtor_data of dma-buf structor. The dma-buf attach with cache will try to find cached attachment first and return the valid instance. This patch also store the deattch operation to dtor of dma-buf structor by dma_buf_set_destructor. Change-Id: I4778c3328825f6c04f5d2608994e62fe3478bf1b Signed-off-by: Jianqun Xu <jay.xu@rock-chips.com>
33 lines
1007 B
C
33 lines
1007 B
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright (c) 2021 Rockchip Electronics Co. Ltd.
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*/
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#ifndef _LINUX_DMA_BUF_CACHE_H
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#define _LINUX_DMA_BUF_CACHE_H
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#include <linux/dma-buf.h>
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extern void dma_buf_cache_detach(struct dma_buf *dmabuf,
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struct dma_buf_attachment *attach);
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extern void dma_buf_cache_unmap_attachment(struct dma_buf_attachment *attach,
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struct sg_table *sg_table,
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enum dma_data_direction direction);
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extern struct dma_buf_attachment *
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dma_buf_cache_attach(struct dma_buf *dmabuf, struct device *dev);
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extern struct sg_table *
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dma_buf_cache_map_attachment(struct dma_buf_attachment *attach,
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enum dma_data_direction direction);
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#ifdef CONFIG_DMABUF_CACHE
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/* Replace dma-buf apis to cached apis */
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#define dma_buf_attach dma_buf_cache_attach
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#define dma_buf_detach dma_buf_cache_detach
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#define dma_buf_map_attachment dma_buf_cache_map_attachment
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#define dma_buf_unmap_attachment dma_buf_cache_unmap_attachment
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#endif
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#endif /* _LINUX_DMA_BUF_CACHE_H */
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