iommu: Add domain-attribute handlers

This patch introduces an extension to the iommu-api to get
and set attributes for an iommu_domain. Two functions are
introduced for this:

	* iommu_domain_get_attr()
	* iommu_domain_set_attr()

These functions will be used to make the iommu-api suitable
for GART-like IOMMUs and to implement hardware-specifc
api-extensions.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>

2 files changed, 47 insertions, 1 deletions

diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index 8b9ded88e6f5..c39972d8ded3 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -344,3 +344,23 @@ int iommu_device_group(struct device *dev, unsigned int *groupid)
         return -ENODEV;
 }
 EXPORT_SYMBOL_GPL(iommu_device_group);
+
+int iommu_domain_get_attr(struct iommu_domain *domain,
+                          enum iommu_attr attr, void *data)
+{
+        if (!domain->ops->domain_get_attr)
+                return -EINVAL;
+
+        return domain->ops->domain_get_attr(domain, attr, data);
+}
+EXPORT_SYMBOL_GPL(iommu_domain_get_attr);
+
+int iommu_domain_set_attr(struct iommu_domain *domain,
+                          enum iommu_attr attr, void *data)
+{
+        if (!domain->ops->domain_set_attr)
+                return -EINVAL;
+
+        return domain->ops->domain_set_attr(domain, attr, data);
+}
+EXPORT_SYMBOL_GPL(iommu_domain_set_attr);
diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index 450293f6d68b..0eef096183e8 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -47,6 +47,10 @@ struct iommu_domain {
 #define IOMMU_CAP_CACHE_COHERENCY       0x1
 #define IOMMU_CAP_INTR_REMAP            0x2     /* isolates device intrs */
 
+enum iommu_attr {
+        DOMAIN_ATTR_MAX,
+};
+
 #ifdef CONFIG_IOMMU_API
 
 /**
@@ -59,7 +63,8 @@ struct iommu_domain {
  * @unmap: unmap a physically contiguous memory region from an iommu domain
  * @iova_to_phys: translate iova to physical address
  * @domain_has_cap: domain capabilities query
- * @commit: commit iommu domain
+ * @domain_get_attr: Query domain attributes
+ * @domain_set_attr: Change domain attributes
  * @pgsize_bitmap: bitmap of supported page sizes
  */
 struct iommu_ops {
@@ -76,6 +81,10 @@ struct iommu_ops {
         int (*domain_has_cap)(struct iommu_domain *domain,
                               unsigned long cap);
         int (*device_group)(struct device *dev, unsigned int *groupid);
+        int (*domain_get_attr)(struct iommu_domain *domain,
+                               enum iommu_attr attr, void *data);
+        int (*domain_set_attr)(struct iommu_domain *domain,
+                               enum iommu_attr attr, void *data);
         unsigned long pgsize_bitmap;
 };
 
@@ -99,6 +108,11 @@ extern void iommu_set_fault_handler(struct iommu_domain *domain,
                         iommu_fault_handler_t handler, void *token);
 extern int iommu_device_group(struct device *dev, unsigned int *groupid);
 
+extern int iommu_domain_get_attr(struct iommu_domain *domain, enum iommu_attr,
+                                 void *data);
+extern int iommu_domain_set_attr(struct iommu_domain *domain, enum iommu_attr,
+                                 void *data);
+
 /**
  * report_iommu_fault() - report about an IOMMU fault to the IOMMU framework
  * @domain: the iommu domain where the fault has happened
@@ -202,6 +216,18 @@ static inline int iommu_device_group(struct device *dev, unsigned int *groupid)
         return -ENODEV;
 }
 
+static inline int iommu_domain_get_attr(struct iommu_domain *domain,
+                                        enum iommu_attr attr, void *data)
+{
+        return -EINVAL;
+}
+
+static inline int iommu_domain_set_attr(struct iommu_domain *domain,
+                                        enum iommu_attr attr, void *data)
+{
+        return -EINVAL;
+}
+
 #endif /* CONFIG_IOMMU_API */
 
 #endif /* __LINUX_IOMMU_H */