tree c91fd568f308365f22d42a0ab8cc07e6396c678f
parent 53c92d793395fdab9edbd2f79b084bb6b2e6ae79
author Robin Murphy <robin.murphy@arm.com> 1460050926 +0100
committer Joerg Roedel <jroedel@suse.de> 1462800809 +0200

iommu: Allow selecting page sizes per domain

Many IOMMUs support multiple page table formats, meaning that any given
domain may only support a subset of the hardware page sizes presented in
iommu_ops->pgsize_bitmap. There are also certain use-cases where the
creator of a domain may want to control which page sizes are used, for
example to force the use of hugepage mappings to reduce pagetable walk
depth.

To this end, add a per-domain pgsize_bitmap to represent the subset of
page sizes actually in use, to make it possible for domains with
different requirements to coexist.

Signed-off-by: Will Deacon <will.deacon@arm.com>
[rm: hijacked and rebased original patch with new commit message]
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Acked-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>