Prepare for an embedded structure design for driver-level iommufd_viommu
objects:
    // include/linux/iommufd.h
    struct iommufd_viommu {
        struct iommufd_object obj;
        ....
    };

    // Some IOMMU driver
    struct iommu_driver_viommu {
        struct iommufd_viommu core;
        ....
    };

It has to expose struct iommufd_object from core-level private header to
the public iommufd header.

Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Signed-off-by: Nicolin Chen <nicolinc@nvidia.com>
---
 drivers/iommu/iommufd/iommufd_private.h | 10 +---------
 include/linux/iommufd.h                 |  9 +++++++++
 2 files changed, 10 insertions(+), 9 deletions(-)

diff --git a/drivers/iommu/iommufd/iommufd_private.h b/drivers/iommu/iommufd/iommufd_private.h
index f1d865e6fab6..7221f81ae211 100644
--- a/drivers/iommu/iommufd/iommufd_private.h
+++ b/drivers/iommu/iommufd/iommufd_private.h
@@ -5,8 +5,8 @@
 #define __IOMMUFD_PRIVATE_H
 
 #include <linux/iommu.h>
+#include <linux/iommufd.h>
 #include <linux/iova_bitmap.h>
-#include <linux/refcount.h>
 #include <linux/rwsem.h>
 #include <linux/uaccess.h>
 #include <linux/xarray.h>
@@ -137,14 +137,6 @@ enum iommufd_object_type {
 	IOMMUFD_OBJ_MAX,
 };
 
-/* Base struct for all objects with a userspace ID handle. */
-struct iommufd_object {
-	refcount_t shortterm_users;
-	refcount_t users;
-	enum iommufd_object_type type;
-	unsigned int id;
-};
-
 static inline bool iommufd_lock_obj(struct iommufd_object *obj)
 {
 	if (!refcount_inc_not_zero(&obj->users))
diff --git a/include/linux/iommufd.h b/include/linux/iommufd.h
index 30f832a60ccb..6b9d46981870 100644
--- a/include/linux/iommufd.h
+++ b/include/linux/iommufd.h
@@ -8,6 +8,7 @@
 
 #include <linux/err.h>
 #include <linux/errno.h>
+#include <linux/refcount.h>
 #include <linux/types.h>
 
 struct device;
@@ -18,6 +19,14 @@ struct iommufd_ctx;
 struct iommufd_device;
 struct page;
 
+/* Base struct for all objects with a userspace ID handle. */
+struct iommufd_object {
+	refcount_t shortterm_users;
+	refcount_t users;
+	unsigned int type; /* enum iommufd_object_type in iommufd_private.h */
+	unsigned int id;
+};
+
 struct iommufd_device *iommufd_device_bind(struct iommufd_ctx *ictx,
 					   struct device *dev, u32 *id);
 void iommufd_device_unbind(struct iommufd_device *idev);
-- 
2.43.0