dma-mapping: introduce dma_get_merge_boundary()
This patch adds a new DMA API "dma_get_merge_boundary". This function returns the DMA merge boundary if the DMA layer can merge the segments. This patch also adds the implementation for a new dma_map_ops pointer. Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com> Reviewed-by: Simon Horman <horms+renesas@verge.net.au> Signed-off-by: Christoph Hellwig <hch@lst.de>
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@ -204,6 +204,14 @@ Returns the maximum size of a mapping for the device. The size parameter
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of the mapping functions like dma_map_single(), dma_map_page() and
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others should not be larger than the returned value.
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::
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unsigned long
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dma_get_merge_boundary(struct device *dev);
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Returns the DMA merge boundary. If the device cannot merge any the DMA address
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segments, the function returns 0.
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Part Id - Streaming DMA mappings
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--------------------------------
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@ -131,6 +131,7 @@ struct dma_map_ops {
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int (*dma_supported)(struct device *dev, u64 mask);
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u64 (*get_required_mask)(struct device *dev);
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size_t (*max_mapping_size)(struct device *dev);
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unsigned long (*get_merge_boundary)(struct device *dev);
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};
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#define DMA_MAPPING_ERROR (~(dma_addr_t)0)
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@ -467,6 +468,7 @@ int dma_set_mask(struct device *dev, u64 mask);
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int dma_set_coherent_mask(struct device *dev, u64 mask);
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u64 dma_get_required_mask(struct device *dev);
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size_t dma_max_mapping_size(struct device *dev);
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unsigned long dma_get_merge_boundary(struct device *dev);
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#else /* CONFIG_HAS_DMA */
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static inline dma_addr_t dma_map_page_attrs(struct device *dev,
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struct page *page, size_t offset, size_t size,
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@ -572,6 +574,10 @@ static inline size_t dma_max_mapping_size(struct device *dev)
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{
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return 0;
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}
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static inline unsigned long dma_get_merge_boundary(struct device *dev)
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{
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return 0;
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}
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#endif /* CONFIG_HAS_DMA */
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static inline dma_addr_t dma_map_single_attrs(struct device *dev, void *ptr,
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@ -407,3 +407,14 @@ size_t dma_max_mapping_size(struct device *dev)
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return size;
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}
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EXPORT_SYMBOL_GPL(dma_max_mapping_size);
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unsigned long dma_get_merge_boundary(struct device *dev)
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{
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const struct dma_map_ops *ops = get_dma_ops(dev);
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if (!ops || !ops->get_merge_boundary)
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return 0; /* can't merge */
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return ops->get_merge_boundary(dev);
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}
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EXPORT_SYMBOL_GPL(dma_get_merge_boundary);
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