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dma-mapping: add dma_opt_mapping_size()
Streaming DMA mapping involving an IOMMU may be much slower for larger total mapping size. This is because every IOMMU DMA mapping requires an IOVA to be allocated and freed. IOVA sizes above a certain limit are not cached, which can have a big impact on DMA mapping performance. Provide an API for device drivers to know this "optimal" limit, such that they may try to produce mapping which don't exceed it. Signed-off-by: John Garry <[email protected]> Reviewed-by: Damien Le Moal <[email protected]> Acked-by: Martin K. Petersen <[email protected]> Signed-off-by: Christoph Hellwig <[email protected]>
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John Garry
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Christoph Hellwig
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Jul 19, 2022
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