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| author | Robin Murphy <robin.murphy@arm.com> | 2016-04-07 20:42:06 +0300 |
|---|---|---|
| committer | Joerg Roedel <jroedel@suse.de> | 2016-05-09 16:33:29 +0300 |
| commit | d16e0faab911cc0e100a1e8e93635b432566608e (patch) | |
| tree | c91fd568f308365f22d42a0ab8cc07e6396c678f /include/linux/iommu.h | |
| parent | 53c92d793395fdab9edbd2f79b084bb6b2e6ae79 (diff) | |
| download | linux-d16e0faab911cc0e100a1e8e93635b432566608e.tar.xz | |
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>
Diffstat (limited to 'include/linux/iommu.h')
| -rw-r--r-- | include/linux/iommu.h | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/include/linux/iommu.h b/include/linux/iommu.h index 8a2570443b80..7811294bc0f7 100644 --- a/include/linux/iommu.h +++ b/include/linux/iommu.h @@ -78,6 +78,7 @@ struct iommu_domain_geometry { struct iommu_domain { unsigned type; const struct iommu_ops *ops; + unsigned long pgsize_bitmap; /* Bitmap of page sizes in use */ iommu_fault_handler_t handler; void *handler_token; struct iommu_domain_geometry geometry; @@ -155,7 +156,7 @@ struct iommu_dm_region { * @domain_set_windows: Set the number of windows for a domain * @domain_get_windows: Return the number of windows for a domain * @of_xlate: add OF master IDs to iommu grouping - * @pgsize_bitmap: bitmap of supported page sizes + * @pgsize_bitmap: bitmap of all possible supported page sizes */ struct iommu_ops { bool (*capable)(enum iommu_cap); |