vdpa: Add suspend operation

This operation is optional: It it's not implemented, backend feature bit
will not be exposed.

Signed-off-by: Eugenio Pérez <eperezma@redhat.com>
Message-Id: <20220810171512.2343333-2-eperezma@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

diff --git a/include/linux/vdpa.h b/include/linux/vdpa.h
index 7b4a13d..d282f46 100644 (file)
--- a/include/linux/vdpa.h
+++ b/include/linux/vdpa.h
@@ -218,6 +218,9 @@ struct vdpa_map_file {
  * @reset:                     Reset device
  *                             @vdev: vdpa device
  *                             Returns integer: success (0) or error (< 0)
+ * @suspend:                   Suspend or resume the device (optional)
+ *                             @vdev: vdpa device
+ *                             Returns integer: success (0) or error (< 0)
  * @get_config_size:           Get the size of the configuration space includes
  *                             fields that are conditional on feature bits.
  *                             @vdev: vdpa device
@@ -319,6 +322,7 @@ struct vdpa_config_ops {
        u8 (*get_status)(struct vdpa_device *vdev);
        void (*set_status)(struct vdpa_device *vdev, u8 status);
        int (*reset)(struct vdpa_device *vdev);
+       int (*suspend)(struct vdpa_device *vdev);
        size_t (*get_config_size)(struct vdpa_device *vdev);
        void (*get_config)(struct vdpa_device *vdev, unsigned int offset,
                           void *buf, unsigned int len);