iommu: Add DOMAIN_ATTR_WINDOWS domain attribute

This attribute can be used to set and get the number of
subwindows on IOMMUs that are window-based.

Signed-off-by: Joerg Roedel <joro@8bytes.org>

1 files changed, 5 insertions, 0 deletions

diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index 5ea3d7250917..ba3b8a98a049 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -60,6 +60,7 @@ struct iommu_domain {
 enum iommu_attr {
         DOMAIN_ATTR_GEOMETRY,
         DOMAIN_ATTR_PAGING,
+        DOMAIN_ATTR_WINDOWS,
         DOMAIN_ATTR_MAX,
 };
 
@@ -106,6 +107,10 @@ struct iommu_ops {
         int (*domain_window_enable)(struct iommu_domain *domain, u32 wnd_nr,
                                     phys_addr_t paddr, u64 size);
         void (*domain_window_disable)(struct iommu_domain *domain, u32 wnd_nr);
+        /* Set the numer of window per domain */
+        int (*domain_set_windows)(struct iommu_domain *domain, u32 w_count);
+        /* Get the numer of window per domain */
+        u32 (*domain_get_windows)(struct iommu_domain *domain);
 
         unsigned long pgsize_bitmap;
 };