[PATCH rfcv1 03/23] backends/iommufd_device: introduce IOMMUFDDevice targeted interface

[Zhenzhong Duan]

With IOMMUFDDevice passed to vIOMMU, we can query hw IOMMU information
and allocate hwpt for a device, but still need an extensible interface
for vIOMMU usage.

This introduces an IOMMUFDDevice targeted interface for vIOMMU.
Currently this interface includes two callbacks attach_hwpt/detach_hwpt
for vIOMMU to attach to or detach from hwpt on host side.

Signed-off-by: Yi Liu <yi.l.liu@intel.com>
Signed-off-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
---
 include/sysemu/iommufd_device.h | 11 ++++++++++-
 backends/iommufd_device.c       | 16 +++++++++++++++-
 hw/vfio/iommufd.c               |  3 ++-
 3 files changed, 27 insertions(+), 3 deletions(-)

diff --git a/include/sysemu/iommufd_device.h b/include/sysemu/iommufd_device.h
index 795630324b..799c1345fd 100644
--- a/include/sysemu/iommufd_device.h
+++ b/include/sysemu/iommufd_device.h
@@ -17,15 +17,24 @@
 
 typedef struct IOMMUFDDevice IOMMUFDDevice;
 
+typedef struct IOMMUFDDeviceOps {
+    int (*attach_hwpt)(IOMMUFDDevice *idev, uint32_t hwpt_id);
+    int (*detach_hwpt)(IOMMUFDDevice *idev);
+} IOMMUFDDeviceOps;
+
 /* This is an abstraction of host IOMMUFD device */
 struct IOMMUFDDevice {
     IOMMUFDBackend *iommufd;
     uint32_t dev_id;
+    IOMMUFDDeviceOps *ops;
 };
 
+int iommufd_device_attach_hwpt(IOMMUFDDevice *idev, uint32_t hwpt_id);
+int iommufd_device_detach_hwpt(IOMMUFDDevice *idev);
 int iommufd_device_get_info(IOMMUFDDevice *idev,
                             enum iommu_hw_info_type *type,
                             uint32_t len, void *data);
 void iommufd_device_init(void *_idev, size_t instance_size,
-                         IOMMUFDBackend *iommufd, uint32_t dev_id);
+                         IOMMUFDBackend *iommufd, uint32_t dev_id,
+                         IOMMUFDDeviceOps *ops);
 #endif
diff --git a/backends/iommufd_device.c b/backends/iommufd_device.c
index f6e7ca1dbf..26f69252d2 100644
--- a/backends/iommufd_device.c
+++ b/backends/iommufd_device.c
@@ -14,6 +14,18 @@
 #include "qemu/error-report.h"
 #include "sysemu/iommufd_device.h"
 
+int iommufd_device_attach_hwpt(IOMMUFDDevice *idev, uint32_t hwpt_id)
+{
+    g_assert(idev->ops->attach_hwpt);
+    return idev->ops->attach_hwpt(idev, hwpt_id);
+}
+
+int iommufd_device_detach_hwpt(IOMMUFDDevice *idev)
+{
+    g_assert(idev->ops->detach_hwpt);
+    return idev->ops->detach_hwpt(idev);
+}
+
 int iommufd_device_get_info(IOMMUFDDevice *idev,
                             enum iommu_hw_info_type *type,
                             uint32_t len, void *data)
@@ -39,7 +51,8 @@ int iommufd_device_get_info(IOMMUFDDevice *idev,
 }
 
 void iommufd_device_init(void *_idev, size_t instance_size,
-                         IOMMUFDBackend *iommufd, uint32_t dev_id)
+                         IOMMUFDBackend *iommufd, uint32_t dev_id,
+                         IOMMUFDDeviceOps *ops)
 {
     IOMMUFDDevice *idev = (IOMMUFDDevice *)_idev;
 
@@ -47,4 +60,5 @@ void iommufd_device_init(void *_idev, size_t instance_size,
 
     idev->iommufd = iommufd;
     idev->dev_id = dev_id;
+    idev->ops = ops;
 }
diff --git a/hw/vfio/iommufd.c b/hw/vfio/iommufd.c
index cbd035f148..1b174b71ee 100644
--- a/hw/vfio/iommufd.c
+++ b/hw/vfio/iommufd.c
@@ -429,7 +429,8 @@ found_container:
     QLIST_INSERT_HEAD(&bcontainer->device_list, vbasedev, container_next);
     QLIST_INSERT_HEAD(&vfio_device_list, vbasedev, global_next);
 
-    iommufd_device_init(idev, sizeof(*idev), container->be, vbasedev->devid);
+    iommufd_device_init(idev, sizeof(*idev), container->be, vbasedev->devid,
+                        NULL);
     trace_iommufd_cdev_device_info(vbasedev->name, devfd, vbasedev->num_irqs,
                                    vbasedev->num_regions, vbasedev->flags);
     return 0;
-- 
2.34.1