iommu: Add domain window handling functions

Add the iommu_domain_window_enable() and iommu_domain_window_disable()
functions to the IOMMU-API. These functions will be used to setup
domains that are based on subwindows and not on paging.

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

2 files changed, 42 insertions, 0 deletions

diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index 0e0e5f2e0ccc..b3aced7356cc 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -852,6 +852,26 @@ size_t iommu_unmap(struct iommu_domain *domain, unsigned long iova, size_t size)
 }
 EXPORT_SYMBOL_GPL(iommu_unmap);
 
+
+int iommu_domain_window_enable(struct iommu_domain *domain, u32 wnd_nr,
+                               phys_addr_t paddr, u64 size)
+{
+        if (unlikely(domain->ops->domain_window_enable == NULL))
+                return -ENODEV;
+
+        return domain->ops->domain_window_enable(domain, wnd_nr, paddr, size);
+}
+EXPORT_SYMBOL_GPL(iommu_domain_window_enable);
+
+void iommu_domain_window_disable(struct iommu_domain *domain, u32 wnd_nr)
+{
+        if (unlikely(domain->ops->domain_window_disable == NULL))
+                return;
+
+        return domain->ops->domain_window_disable(domain, wnd_nr);
+}
+EXPORT_SYMBOL_GPL(iommu_domain_window_disable);
+
 static int __init iommu_init(void)
 {
         iommu_group_kset = kset_create_and_add("iommu_groups",
diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index 26066f54a849..5ea3d7250917 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -101,6 +101,12 @@ struct iommu_ops {
                                enum iommu_attr attr, void *data);
         int (*domain_set_attr)(struct iommu_domain *domain,
                                enum iommu_attr attr, void *data);
+
+        /* Window handling functions */
+        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);
+
         unsigned long pgsize_bitmap;
 };
 
@@ -158,6 +164,10 @@ extern int iommu_domain_get_attr(struct iommu_domain *domain, enum iommu_attr,
 extern int iommu_domain_set_attr(struct iommu_domain *domain, enum iommu_attr,
                                  void *data);
 
+/* Window handling function prototypes */
+extern int iommu_domain_window_enable(struct iommu_domain *domain, u32 wnd_nr,
+                                      phys_addr_t offset, u64 size);
+extern void iommu_domain_window_disable(struct iommu_domain *domain, u32 wnd_nr);
 /**
  * report_iommu_fault() - report about an IOMMU fault to the IOMMU framework
  * @domain: the iommu domain where the fault has happened
@@ -240,6 +250,18 @@ static inline int iommu_unmap(struct iommu_domain *domain, unsigned long iova,
         return -ENODEV;
 }
 
+static inline int iommu_domain_window_enable(struct iommu_domain *domain,
+                                             u32 wnd_nr, phys_addr_t paddr,
+                                             u64 size)
+{
+        return -ENODEV;
+}
+
+static inline void iommu_domain_window_disable(struct iommu_domain *domain,
+                                               u32 wnd_nr)
+{
+}
+
 static inline phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain,
                                              unsigned long iova)
 {