flush_iopte_range
flush_iopte_range(obj->dev, obj->pd_dma, offset, 1);
flush_iopte_range(obj->dev, obj->pd_dma, offset, 1);
flush_iopte_range(obj->dev, obj->pd_dma, offset, 16);
flush_iopte_range(obj->dev, pt_dma, offset, 1);
flush_iopte_range(obj->dev, pt_dma, offset, 16);
flush_iopte_range(obj->dev, pt_dma, pt_offset, nent);
flush_iopte_range(obj->dev, obj->pd_dma, pd_offset, nent);
flush_iopte_range(obj->dev, obj->pd_dma, offset, 1);