[PATCH] iommu: making IOMMU sysfs nodes API public

[Alexey Kardashevskiy <aik@ozlabs.ru>]

Having this patch in a tree, adding new nodes in sysfs
for IOMMU groups is going to be easier.

The first candidate for this change is a "dma-window-size"
property which tells a size of a DMA window of the specific
IOMMU group which can be used later for locked pages accounting.

Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
---
 drivers/iommu/iommu.c |   19 ++-----------------
 include/linux/iommu.h |   20 ++++++++++++++++++++
 2 files changed, 22 insertions(+), 17 deletions(-)

diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index b0afd3d..58cc298 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -52,22 +52,6 @@ struct iommu_device {
 	char *name;
 };
 
-struct iommu_group_attribute {
-	struct attribute attr;
-	ssize_t (*show)(struct iommu_group *group, char *buf);
-	ssize_t (*store)(struct iommu_group *group,
-			 const char *buf, size_t count);
-};
-
-#define IOMMU_GROUP_ATTR(_name, _mode, _show, _store)		\
-struct iommu_group_attribute iommu_group_attr_##_name =		\
-	__ATTR(_name, _mode, _show, _store)
-
-#define to_iommu_group_attr(_attr)	\
-	container_of(_attr, struct iommu_group_attribute, attr)
-#define to_iommu_group(_kobj)		\
-	container_of(_kobj, struct iommu_group, kobj)
-
 static ssize_t iommu_group_attr_show(struct kobject *kobj,
 				     struct attribute *__attr, char *buf)
 {
@@ -98,11 +82,12 @@ static const struct sysfs_ops iommu_group_sysfs_ops = {
 	.store = iommu_group_attr_store,
 };
 
-static int iommu_group_create_file(struct iommu_group *group,
+int iommu_group_create_file(struct iommu_group *group,
 				   struct iommu_group_attribute *attr)
 {
 	return sysfs_create_file(&group->kobj, &attr->attr);
 }
+EXPORT_SYMBOL_GPL(iommu_group_create_file);
 
 static void iommu_group_remove_file(struct iommu_group *group,
 				    struct iommu_group_attribute *attr)
diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index f3b99e1..6d24ba7 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -21,6 +21,7 @@
 
 #include <linux/errno.h>
 #include <linux/types.h>
+#include <linux/stat.h>
 
 #define IOMMU_READ	(1)
 #define IOMMU_WRITE	(2)
@@ -197,6 +198,25 @@ static inline int report_iommu_fault(struct iommu_domain *domain,
 	return ret;
 }
 
+struct iommu_group_attribute {
+	struct attribute attr;
+	ssize_t (*show)(struct iommu_group *group, char *buf);
+	ssize_t (*store)(struct iommu_group *group,
+			 const char *buf, size_t count);
+};
+
+#define IOMMU_GROUP_ATTR(_name, _mode, _show, _store)		\
+struct iommu_group_attribute iommu_group_attr_##_name =		\
+	__ATTR(_name, _mode, _show, _store)
+
+#define to_iommu_group_attr(_attr)	\
+	container_of(_attr, struct iommu_group_attribute, attr)
+#define to_iommu_group(_kobj)		\
+	container_of(_kobj, struct iommu_group, kobj)
+
+extern int iommu_group_create_file(struct iommu_group *group,
+				   struct iommu_group_attribute *attr);
+
 #else /* CONFIG_IOMMU_API */
 
 struct iommu_ops {};
-- 
1.7.10.4