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dma-mapping: introduce dma_get_merge_boundary()

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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>
This commit is contained in:
Yoshihiro Shimoda 2019-08-28 21:35:40 +09:00 • committed by Christoph Hellwig
parent 38c38cb732
commit 6ba99411b8
3 changed files with 25 additions and 0 deletions
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11
kernel/dma/mapping.c
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@ -407,3 +407,14 @@ size_t dma_max_mapping_size(struct device *dev)
return size;
}
EXPORT_SYMBOL_GPL(dma_max_mapping_size);
unsigned long dma_get_merge_boundary(struct device *dev)
{
const struct dma_map_ops *ops = get_dma_ops(dev);
if (!ops || !ops->get_merge_boundary)
return 0; /* can't merge */
return ops->get_merge_boundary(dev);
}
EXPORT_SYMBOL_GPL(dma_get_merge_boundary);