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iommu: Allow selecting page sizes per domain

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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>
This commit is contained in:
Robin Murphy
2016-04-07 18:42:06 +01:00
committed by Joerg Roedel
parent 53c92d7933
commit d16e0faab9
5 changed files with 17 additions and 14 deletions
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2
drivers/iommu/mtk_iommu.c
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@@ -264,7 +264,7 @@ static int mtk_iommu_domain_finalise(struct mtk_iommu_data *data)
}
/* Update our support page sizes bitmap */
mtk_iommu_ops.pgsize_bitmap = dom->cfg.pgsize_bitmap;
dom->domain.pgsize_bitmap = dom->cfg.pgsize_bitmap;
writel(data->m4u_dom->cfg.arm_v7s_cfg.ttbr[0],
data->base + REG_MMU_PT_BASE_ADDR);