iommu: Decouple iommu_map_sg from CPU page size

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If the IOMMU supports pages smaller than the CPU page size, segments
which lie at offsets within the CPU page may be mapped based on the
finer-grained IOMMU page boundaries. This minimises the amount of
non-buffer memory between the CPU page boundary and the start of the
segment which must be mapped and therefore exposed to the device, and
brings the default iommu_map_sg implementation in line with
iommu_map/unmap with respect to alignment.

Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>

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Robin Murphy 2014-11-25 17:50:55 +00:00 • committed by Joerg Roedel

parent 0690cbd2e5

commit 18f2340990

1 changed files with 15 additions and 5 deletions

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drivers/iommu/iommu.c

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