[Qemu-ppc] [PATCH RFC 2/4] VFIO: Introduce vfio_get_group_id()

[Gavin Shan]

This introduces vfio_get_group_id() to retrieve the group ID from
the specified PCI device. The function will be used by subsequent
patches to support applying EEH operation on the specified IOMMU
group.

Signed-off-by: Gavin Shan <address@hidden>
---
 hw/vfio/pci.c          | 12 ++++++++++++
 include/hw/vfio/vfio.h |  1 +
 2 files changed, 13 insertions(+)

diff --git a/hw/vfio/pci.c b/hw/vfio/pci.c
index 73d34b9..27d7842 100644
--- a/hw/vfio/pci.c
+++ b/hw/vfio/pci.c
@@ -3507,6 +3507,18 @@ static void vfio_setup_resetfn(VFIOPCIDevice *vdev)
     }
 }
 
+int vfio_get_group_id(PCIDevice *pdev)
+{
+    VFIOPCIDevice *vdev = DO_UPCAST(VFIOPCIDevice, pdev, pdev);
+
+    if (!pdev || !object_dynamic_cast(OBJECT(pdev), "vfio-pci") ||
+        !vdev->vbasedev.group) {
+        return -1;
+    }
+
+    return vdev->vbasedev.group->groupid;
+}
+
 static int vfio_initfn(PCIDevice *pdev)
 {
     VFIOPCIDevice *vdev = DO_UPCAST(VFIOPCIDevice, pdev, pdev);
diff --git a/include/hw/vfio/vfio.h b/include/hw/vfio/vfio.h
index 0b26cd8..6289b96 100644
--- a/include/hw/vfio/vfio.h
+++ b/include/hw/vfio/vfio.h
@@ -5,5 +5,6 @@
 
 extern int vfio_container_ioctl(AddressSpace *as, int32_t groupid,
                                 int req, void *param);
+extern int vfio_get_group_id(PCIDevice *pdev);
 
 #endif
-- 
2.1.0