[PATCH v3 03/19] backends/iommufd: Introduce abstract HostIOMMUDeviceIOMMUFD device

[Zhenzhong Duan <zhenzhong.duan@intel.com>]

HostIOMMUDeviceIOMMUFD represents a host IOMMU device under iommufd
backend.

Currently it contains public iommufd handle and device id which
will be passed to vIOMMU to allocate/free ioas, hwpt, etc.

When nested translation is supported in future, vIOMMU will
request iommufd related operations like attaching/detaching hwpt.
VFIO and VDPA device have different way of attaching/detaching hwpt.
So HostIOMMUDeviceIOMMUFD is still an abstract class which will be
inherited by VFIO and VDPA device sub-classes.

Opportunistically, add missed header to include/sysemu/iommufd.h.

Suggested-by: Cédric Le Goater <clg@redhat.com>
Signed-off-by: Yi Liu <yi.l.liu@intel.com>
Signed-off-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
---
 include/sysemu/iommufd.h | 30 ++++++++++++++++++++++++++++++
 backends/iommufd.c       | 37 ++++++++++++++++++++-----------------
 2 files changed, 50 insertions(+), 17 deletions(-)

diff --git a/include/sysemu/iommufd.h b/include/sysemu/iommufd.h
index 9af27ebd6c..6a9fb0007a 100644
--- a/include/sysemu/iommufd.h
+++ b/include/sysemu/iommufd.h
@@ -1,9 +1,23 @@
+/*
+ * iommufd container backend declaration
+ *
+ * Copyright (C) 2024 Intel Corporation.
+ * Copyright Red Hat, Inc. 2024
+ *
+ * Authors: Yi Liu <yi.l.liu@intel.com>
+ *          Eric Auger <eric.auger@redhat.com>
+ *          Zhenzhong Duan <zhenzhong.duan@intel.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
 #ifndef SYSEMU_IOMMUFD_H
 #define SYSEMU_IOMMUFD_H
 
 #include "qom/object.h"
 #include "exec/hwaddr.h"
 #include "exec/cpu-common.h"
+#include "sysemu/host_iommu_device.h"
 
 #define TYPE_IOMMUFD_BACKEND "iommufd"
 OBJECT_DECLARE_TYPE(IOMMUFDBackend, IOMMUFDBackendClass, IOMMUFD_BACKEND)
@@ -33,4 +47,20 @@ int iommufd_backend_map_dma(IOMMUFDBackend *be, uint32_t ioas_id, hwaddr iova,
                             ram_addr_t size, void *vaddr, bool readonly);
 int iommufd_backend_unmap_dma(IOMMUFDBackend *be, uint32_t ioas_id,
                               hwaddr iova, ram_addr_t size);
+
+#define TYPE_HOST_IOMMU_DEVICE_IOMMUFD TYPE_HOST_IOMMU_DEVICE "-iommufd"
+OBJECT_DECLARE_TYPE(HostIOMMUDeviceIOMMUFD, HostIOMMUDeviceIOMMUFDClass,
+                    HOST_IOMMU_DEVICE_IOMMUFD)
+
+/* Abstract of host IOMMU device with iommufd backend */
+struct HostIOMMUDeviceIOMMUFD {
+    HostIOMMUDevice parent_obj;
+
+    IOMMUFDBackend *iommufd;
+    uint32_t devid;
+};
+
+struct HostIOMMUDeviceIOMMUFDClass {
+    HostIOMMUDeviceClass parent_class;
+};
 #endif
diff --git a/backends/iommufd.c b/backends/iommufd.c
index 76a0204852..19e46194a2 100644
--- a/backends/iommufd.c
+++ b/backends/iommufd.c
@@ -211,23 +211,26 @@ int iommufd_backend_unmap_dma(IOMMUFDBackend *be, uint32_t ioas_id,
     return ret;
 }
 
-static const TypeInfo iommufd_backend_info = {
-    .name = TYPE_IOMMUFD_BACKEND,
-    .parent = TYPE_OBJECT,
-    .instance_size = sizeof(IOMMUFDBackend),
-    .instance_init = iommufd_backend_init,
-    .instance_finalize = iommufd_backend_finalize,
-    .class_size = sizeof(IOMMUFDBackendClass),
-    .class_init = iommufd_backend_class_init,
-    .interfaces = (InterfaceInfo[]) {
-        { TYPE_USER_CREATABLE },
-        { }
+static const TypeInfo types[] = {
+    {
+        .name = TYPE_IOMMUFD_BACKEND,
+        .parent = TYPE_OBJECT,
+        .instance_size = sizeof(IOMMUFDBackend),
+        .instance_init = iommufd_backend_init,
+        .instance_finalize = iommufd_backend_finalize,
+        .class_size = sizeof(IOMMUFDBackendClass),
+        .class_init = iommufd_backend_class_init,
+        .interfaces = (InterfaceInfo[]) {
+            { TYPE_USER_CREATABLE },
+            { }
+        }
+    }, {
+        .name = TYPE_HOST_IOMMU_DEVICE_IOMMUFD,
+        .parent = TYPE_HOST_IOMMU_DEVICE,
+        .instance_size = sizeof(HostIOMMUDeviceIOMMUFD),
+        .class_size = sizeof(HostIOMMUDeviceIOMMUFDClass),
+        .abstract = true,
     }
 };
 
-static void register_types(void)
-{
-    type_register_static(&iommufd_backend_info);
-}
-
-type_init(register_types);
+DEFINE_TYPES(types)
-- 
2.34.1