iommufd: Move struct iommufd_object to public iommufd header

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 and enum iommufd_object_type from
the core-level private header to the public iommufd header.

Link: https://patch.msgid.link/r/54a43b0768089d690104530754f499ca05ce0074.1730836219.git.nicolinc@nvidia.com
Reviewed-by: Jason Gunthorpe <[email protected]>
Reviewed-by: Kevin Tian <[email protected]>
Signed-off-by: Nicolin Chen <[email protected]>
Signed-off-by: Jason Gunthorpe <[email protected]>

Author: nicolinc

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>
@@ -126,29 +126,6 @@ static inline int iommufd_ucmd_respond(struct iommufd_ucmd *ucmd,
 	return 0;
 }
 
-enum iommufd_object_type {
-	IOMMUFD_OBJ_NONE,
-	IOMMUFD_OBJ_ANY = IOMMUFD_OBJ_NONE,
-	IOMMUFD_OBJ_DEVICE,
-	IOMMUFD_OBJ_HWPT_PAGING,
-	IOMMUFD_OBJ_HWPT_NESTED,
-	IOMMUFD_OBJ_IOAS,
-	IOMMUFD_OBJ_ACCESS,
-	IOMMUFD_OBJ_FAULT,
-#ifdef CONFIG_IOMMUFD_TEST
-	IOMMUFD_OBJ_SELFTEST,
-#endif
-	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))

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 +19,29 @@ struct iommufd_ctx;
 struct iommufd_device;
 struct page;
 
+enum iommufd_object_type {
+	IOMMUFD_OBJ_NONE,
+	IOMMUFD_OBJ_ANY = IOMMUFD_OBJ_NONE,
+	IOMMUFD_OBJ_DEVICE,
+	IOMMUFD_OBJ_HWPT_PAGING,
+	IOMMUFD_OBJ_HWPT_NESTED,
+	IOMMUFD_OBJ_IOAS,
+	IOMMUFD_OBJ_ACCESS,
+	IOMMUFD_OBJ_FAULT,
+#ifdef CONFIG_IOMMUFD_TEST
+	IOMMUFD_OBJ_SELFTEST,
+#endif
+	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;
+};
+
 struct iommufd_device *iommufd_device_bind(struct iommufd_ctx *ictx,
 					   struct device *dev, u32 *id);
 void iommufd_device_unbind(struct iommufd_device *idev);