e9a05bb4d3
Modify spdx tag for all CAF authored files for Kona. Change-Id: I9308c7189412b1e428a7f67ded0dc076b0e38254 Signed-off-by: Rishabh Bhatnagar <rishabhb@codeaurora.org>
109 lines
3.2 KiB
C
109 lines
3.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright (c) 2015-2016, 2018 The Linux Foundation. All rights reserved.
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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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#ifdef CONFIG_QCOM_LAZY_MAPPING
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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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unsigned long attrs);
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/*
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* This function takes an extra reference to the dma_buf.
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* What this means is that calling msm_dma_unmap_sg will not result in buffer's
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* iommu mapping being removed, which means that subsequent calls to lazy map
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* will simply re-use the existing iommu mapping.
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* The iommu unmapping of the buffer will occur when the ION buffer is
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* destroyed.
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* Using lazy mapping can provide a performance benefit because subsequent
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* mappings are faster.
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*
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* The limitation of using this API are that all subsequent iommu mappings
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* must be the same as the original mapping, ie they must map the same part of
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* the buffer with the same dma data direction. Also there can't be multiple
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* mappings of different parts of the buffer.
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*/
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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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unsigned long attrs;
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attrs = DMA_ATTR_NO_DELAYED_UNMAP;
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return msm_dma_map_sg_attrs(dev, sg, nents, dir, dma_buf, attrs);
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}
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void msm_dma_unmap_sg_attrs(struct device *dev, struct scatterlist *sgl,
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int nents, enum dma_data_direction dir,
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struct dma_buf *dma_buf, unsigned long attrs);
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int msm_dma_unmap_all_for_dev(struct device *dev);
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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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#else /*CONFIG_QCOM_LAZY_MAPPING*/
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static inline int msm_dma_map_sg_attrs(struct device *dev,
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struct scatterlist *sg, int nents,
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enum dma_data_direction dir, struct dma_buf *dma_buf,
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unsigned long attrs)
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{
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return -EINVAL;
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}
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static inline void
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msm_dma_unmap_sg_attrs(struct device *dev, struct scatterlist *sgl,
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int nents, enum dma_data_direction dir,
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struct dma_buf *dma_buf, unsigned long attrs)
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{
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}
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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 -EINVAL;
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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 -EINVAL;
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}
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static inline int msm_dma_unmap_all_for_dev(struct device *dev)
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{
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return 0;
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}
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static inline void msm_dma_buf_freed(void *buffer) {}
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#endif /*CONFIG_QCOM_LAZY_MAPPING*/
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#endif
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