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authorRobin Murphy <robin.murphy@arm.com>2016-04-07 20:42:06 +0300
committerJoerg Roedel <jroedel@suse.de>2016-05-09 16:33:29 +0300
commitd16e0faab911cc0e100a1e8e93635b432566608e (patch)
treec91fd568f308365f22d42a0ab8cc07e6396c678f /include/linux/iommu.h
parent53c92d793395fdab9edbd2f79b084bb6b2e6ae79 (diff)
downloadlinux-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.h3
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);