87e6f73b29
Add new APIs to allow clients to map and unmap dma_buffers created by ION. The call to the unmap API will not actually do the unmapping from the IOMMU. The unmapping will occur when the ION/dma_buf buffer is actually freed. This behavior can be disabled with DMA_ATTR_NO_DELAYED_UNMAP Change-Id: Ic4dbd3b582eb0388020c650cab5fbb1dad67ae81 Signed-off-by: Olav Haugan <ohaugan@codeaurora.org>
61 lines
1.9 KiB
C
61 lines
1.9 KiB
C
/* Copyright (c) 2015, The Linux Foundation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 and
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* only version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#ifndef _LINUX_MSM_DMA_IOMMU_MAPPING_H
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#define _LINUX_MSM_DMA_IOMMU_MAPPING_H
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#include <linux/device.h>
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#include <linux/dma-buf.h>
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#include <linux/scatterlist.h>
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#include <linux/dma-mapping.h>
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enum msm_dma_map_attr {
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MSM_DMA_ATTR_NO_DELAYED_UNMAP = 0x1,
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};
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/*
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* This function is not taking a reference to the dma_buf here. It is expected
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* that clients hold reference to the dma_buf until they are done with mapping
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* and unmapping.
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*/
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int msm_dma_map_sg_attrs(struct device *dev, struct scatterlist *sg, int nents,
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enum dma_data_direction dir, struct dma_buf *dma_buf,
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int flags);
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static inline int msm_dma_map_sg_lazy(struct device *dev,
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struct scatterlist *sg, int nents,
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enum dma_data_direction dir,
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struct dma_buf *dma_buf)
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{
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return msm_dma_map_sg_attrs(dev, sg, nents, dir, dma_buf, 0);
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}
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static inline int msm_dma_map_sg(struct device *dev, struct scatterlist *sg,
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int nents, enum dma_data_direction dir,
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struct dma_buf *dma_buf)
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{
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return msm_dma_map_sg_attrs(dev, sg, nents, dir, dma_buf,
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MSM_DMA_ATTR_NO_DELAYED_UNMAP);
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}
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void msm_dma_unmap_sg(struct device *dev, struct scatterlist *sgl, int nents,
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enum dma_data_direction dir, struct dma_buf *dma_buf);
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/*
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* Below is private function only to be called by framework (ION) and not by
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* clients.
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*/
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void msm_dma_buf_freed(void *buffer);
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#endif
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