iommu: Introduce domain_alloc and domain_free iommu_ops

These new call-backs defer the allocation and destruction of
'struct iommu_domain' to the iommu driver. This allows
drivers to embed this struct into their private domain
structures and to get rid of the domain_init and
domain_destroy call-backs when all drivers have been
converted.

Tested-by: Thierry Reding <treding@nvidia.com>
Tested-by: Heiko Stuebner <heiko@sntech.de>
Reviewed-by: Alex Williamson <alex.williamson@redhat.com>
Acked-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>

1 files changed, 5 insertions, 0 deletions

diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index 38daa453f2e5..69d1d120c0a3 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -115,6 +115,11 @@ struct iommu_ops {
         bool (*capable)(enum iommu_cap);
         int (*domain_init)(struct iommu_domain *domain);
         void (*domain_destroy)(struct iommu_domain *domain);
+
+        /* Domain allocation and freeing by the iommu driver */
+        struct iommu_domain *(*domain_alloc)(void);
+        void (*domain_free)(struct iommu_domain *);
+
         int (*attach_dev)(struct iommu_domain *domain, struct device *dev);
         void (*detach_dev)(struct iommu_domain *domain, struct device *dev);
         int (*map)(struct iommu_domain *domain, unsigned long iova,