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authorJohn Garry2022-07-14 19:15:25 +0800
committerChristoph Hellwig2022-07-19 06:05:45 +0200
commit6d9870b7e5def2450e21316515b9efc0529204dd (patch)
treeabaca6c6f44208643e0c36705199c3ff9ff0dc80 /Documentation
parenta229cc14f3395311b899e5e582b71efa8dd01df0 (diff)
dma-iommu: add iommu_dma_opt_mapping_size()
Add the IOMMU callback for DMA mapping API dma_opt_mapping_size(), which allows the drivers to know the optimal mapping limit and thus limit the requested IOVA lengths. This value is based on the IOVA rcache range limit, as IOVAs allocated above this limit must always be newly allocated, which may be quite slow. Signed-off-by: John Garry <john.garry@huawei.com> Reviewed-by: Damien Le Moal <damien.lemoal@opensource.wdc.com> Acked-by: Robin Murphy <robin.murphy@arm.com> Acked-by: Martin K. Petersen <martin.petersen@oracle.com> Signed-off-by: Christoph Hellwig <hch@lst.de>
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