[RFC 09/18] vfio/platform: Use vfio_[attach/detach]_device

[Yi Liu <yi.l.liu@xxxxxxxxx>]

From: Eric Auger <eric.auger@xxxxxxxxxx>

Let the vfio-platform device use vfio_attach_device() and
vfio_detach_device(), hence hiding the details of the used
IOMMU backend.

Signed-off-by: Eric Auger <eric.auger@xxxxxxxxxx>
Signed-off-by: Yi Liu <yi.l.liu@xxxxxxxxx>
---
 hw/vfio/platform.c | 42 ++----------------------------------------
 1 file changed, 2 insertions(+), 40 deletions(-)

diff --git a/hw/vfio/platform.c b/hw/vfio/platform.c
index 5af73f9287..3bcdc20667 100644
--- a/hw/vfio/platform.c
+++ b/hw/vfio/platform.c
@@ -529,12 +529,7 @@ static VFIODeviceOps vfio_platform_ops = {
  */
 static int vfio_base_device_init(VFIODevice *vbasedev, Error **errp)
 {
-    VFIOGroup *group;
-    VFIODevice *vbasedev_iter;
-    char *tmp, group_path[PATH_MAX], *group_name;
-    ssize_t len;
     struct stat st;
-    int groupid;
     int ret;
 
     /* @sysfsdev takes precedence over @host */
@@ -557,47 +552,14 @@ static int vfio_base_device_init(VFIODevice *vbasedev, Error **errp)
         return -errno;
     }
 
-    tmp = g_strdup_printf("%s/iommu_group", vbasedev->sysfsdev);
-    len = readlink(tmp, group_path, sizeof(group_path));
-    g_free(tmp);
-
-    if (len < 0 || len >= sizeof(group_path)) {
-        ret = len < 0 ? -errno : -ENAMETOOLONG;
-        error_setg_errno(errp, -ret, "no iommu_group found");
-        return ret;
-    }
-
-    group_path[len] = 0;
-
-    group_name = basename(group_path);
-    if (sscanf(group_name, "%d", &groupid) != 1) {
-        error_setg_errno(errp, errno, "failed to read %s", group_path);
-        return -errno;
-    }
-
-    trace_vfio_platform_base_device_init(vbasedev->name, groupid);
-
-    group = vfio_get_group(groupid, &address_space_memory, errp);
-    if (!group) {
-        return -ENOENT;
-    }
-
-    QLIST_FOREACH(vbasedev_iter, &group->device_list, next) {
-        if (strcmp(vbasedev_iter->name, vbasedev->name) == 0) {
-            error_setg(errp, "device is already attached");
-            vfio_put_group(group);
-            return -EBUSY;
-        }
-    }
-    ret = vfio_get_device(group, vbasedev->name, vbasedev, errp);
+    ret = vfio_attach_device(vbasedev, &address_space_memory, errp);
     if (ret) {
-        vfio_put_group(group);
         return ret;
     }
 
     ret = vfio_populate_device(vbasedev, errp);
     if (ret) {
-        vfio_put_group(group);
+        vfio_detach_device(vbasedev);
     }
 
     return ret;
-- 
2.27.0