[PATCH rfcv2 15/18] backends/iommufd: Introduce helper function iommufd_device_get_info()

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

Introduce a helper function iommufd_device_get_info() to get
host IOMMU related information through iommufd uAPI.

Signed-off-by: Yi Liu <yi.l.liu@intel.com>
Signed-off-by: Yi Sun <yi.y.sun@linux.intel.com>
Signed-off-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
---
 include/sysemu/iommufd.h |  4 ++++
 backends/iommufd.c       | 25 ++++++++++++++++++++++++-
 2 files changed, 28 insertions(+), 1 deletion(-)

diff --git a/include/sysemu/iommufd.h b/include/sysemu/iommufd.h
index c3f3469760..ec8b80d8d9 100644
--- a/include/sysemu/iommufd.h
+++ b/include/sysemu/iommufd.h
@@ -4,6 +4,7 @@
 #include "qom/object.h"
 #include "exec/hwaddr.h"
 #include "exec/cpu-common.h"
+#include <linux/iommufd.h>
 #include "sysemu/host_iommu_device.h"
 
 #define TYPE_IOMMUFD_BACKEND "iommufd"
@@ -47,4 +48,7 @@ typedef struct IOMMUFDDevice {
 } IOMMUFDDevice;
 
 void iommufd_device_init(IOMMUFDDevice *idev);
+int iommufd_device_get_info(IOMMUFDDevice *idev,
+                            enum iommu_hw_info_type *type,
+                            uint32_t len, void *data, Error **errp);
 #endif
diff --git a/backends/iommufd.c b/backends/iommufd.c
index d92791bba9..1b0b991747 100644
--- a/backends/iommufd.c
+++ b/backends/iommufd.c
@@ -20,7 +20,6 @@
 #include "monitor/monitor.h"
 #include "trace.h"
 #include <sys/ioctl.h>
-#include <linux/iommufd.h>
 
 static void iommufd_backend_init(Object *obj)
 {
@@ -237,3 +236,27 @@ void iommufd_device_init(IOMMUFDDevice *idev)
     host_iommu_base_device_init(&idev->base, HID_IOMMUFD,
                                 sizeof(IOMMUFDDevice));
 }
+
+int iommufd_device_get_info(IOMMUFDDevice *idev,
+                            enum iommu_hw_info_type *type,
+                            uint32_t len, void *data, Error **errp)
+{
+    struct iommu_hw_info info = {
+        .size = sizeof(info),
+        .flags = 0,
+        .dev_id = idev->devid,
+        .data_len = len,
+        .__reserved = 0,
+        .data_uptr = (uintptr_t)data,
+    };
+    int ret;
+
+    ret = ioctl(idev->iommufd->fd, IOMMU_GET_HW_INFO, &info);
+    if (ret) {
+        error_setg_errno(errp, errno, "Failed to get hardware info");
+    } else {
+        *type = info.out_data_type;
+    }
+
+    return ret;
+}
-- 
2.34.1