vfio/ap: Use vfio_[attach/detach]_device

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

We take the opportunity to use g_path_get_basename() which
is prefered, as suggested by
3e015d815b ("use g_path_get_basename instead of basename")

Signed-off-by: Eric Auger <eric.auger@redhat.com>
Signed-off-by: Yi Liu <yi.l.liu@intel.com>
Signed-off-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
Reviewed-by: Matthew Rosato <mjrosato@linux.ibm.com>
Signed-off-by: Cédric Le Goater <clg@redhat.com>

hw/vfio/ap.c

@@ -53,40 +53,6 @@ struct VFIODeviceOps vfio_ap_ops = {
     .vfio_compute_needs_reset = vfio_ap_compute_needs_reset,
 };
 
-static void vfio_ap_put_device(VFIOAPDevice *vapdev)
-{
-    g_free(vapdev->vdev.name);
-    vfio_put_base_device(&vapdev->vdev);
-}
-
-static VFIOGroup *vfio_ap_get_group(VFIOAPDevice *vapdev, Error **errp)
-{
-    GError *gerror = NULL;
-    char *symlink, *group_path;
-    int groupid;
-
-    symlink = g_strdup_printf("%s/iommu_group", vapdev->vdev.sysfsdev);
-    group_path = g_file_read_link(symlink, &gerror);
-    g_free(symlink);
-
-    if (!group_path) {
-        error_setg(errp, "%s: no iommu_group found for %s: %s",
-                   TYPE_VFIO_AP_DEVICE, vapdev->vdev.sysfsdev, gerror->message);
-        g_error_free(gerror);
-        return NULL;
-    }
-
-    if (sscanf(basename(group_path), "%d", &groupid) != 1) {
-        error_setg(errp, "vfio: failed to read %s", group_path);
-        g_free(group_path);
-        return NULL;
-    }
-
-    g_free(group_path);
-
-    return vfio_get_group(groupid, &address_space_memory, errp);
-}
-
 static void vfio_ap_req_notifier_handler(void *opaque)
 {
     VFIOAPDevice *vapdev = opaque;
@@ -189,22 +155,15 @@ static void vfio_ap_unregister_irq_notifier(VFIOAPDevice *vapdev,
 static void vfio_ap_realize(DeviceState *dev, Error **errp)
 {
     int ret;
-    char *mdevid;
     Error *err = NULL;
-    VFIOGroup *vfio_group;
     APDevice *apdev = AP_DEVICE(dev);
     VFIOAPDevice *vapdev = VFIO_AP_DEVICE(apdev);
+    VFIODevice *vbasedev = &vapdev->vdev;
 
-    vfio_group = vfio_ap_get_group(vapdev, errp);
-    if (!vfio_group) {
-        return;
-    }
-
-    vapdev->vdev.ops = &vfio_ap_ops;
-    vapdev->vdev.type = VFIO_DEVICE_TYPE_AP;
-    mdevid = basename(vapdev->vdev.sysfsdev);
-    vapdev->vdev.name = g_strdup_printf("%s", mdevid);
-    vapdev->vdev.dev = dev;
+    vbasedev->name = g_path_get_basename(vbasedev->sysfsdev);
+    vbasedev->ops = &vfio_ap_ops;
+    vbasedev->type = VFIO_DEVICE_TYPE_AP;
+    vbasedev->dev = dev;
 
     /*
      * vfio-ap devices operate in a way compatible with discarding of
@@ -214,9 +173,10 @@ static void vfio_ap_realize(DeviceState *dev, Error **errp)
      */
     vapdev->vdev.ram_block_discard_allowed = true;
 
-    ret = vfio_get_device(vfio_group, mdevid, &vapdev->vdev, errp);
+    ret = vfio_attach_device(vbasedev->name, vbasedev,
+                             &address_space_memory, errp);
     if (ret) {
-        goto out_get_dev_err;
+        goto error;
     }
 
     vfio_ap_register_irq_notifier(vapdev, VFIO_AP_REQ_IRQ_INDEX, &err);
@@ -230,20 +190,19 @@ static void vfio_ap_realize(DeviceState *dev, Error **errp)
 
     return;
 
-out_get_dev_err:
-    vfio_ap_put_device(vapdev);
-    vfio_put_group(vfio_group);
+error:
+    error_prepend(errp, VFIO_MSG_PREFIX, vbasedev->name);
+    g_free(vbasedev->name);
 }
 
 static void vfio_ap_unrealize(DeviceState *dev)
 {
     APDevice *apdev = AP_DEVICE(dev);
     VFIOAPDevice *vapdev = VFIO_AP_DEVICE(apdev);
-    VFIOGroup *group = vapdev->vdev.group;
 
     vfio_ap_unregister_irq_notifier(vapdev, VFIO_AP_REQ_IRQ_INDEX);
-    vfio_ap_put_device(vapdev);
-    vfio_put_group(group);
+    vfio_detach_device(&vapdev->vdev);
+    g_free(vapdev->vdev.name);
 }
 
 static Property vfio_ap_properties[] = {