swiotlb_sync_single(hwdev, dev_addr, size, dir);
swiotlb_sync_single(hwdev, dev_addr, size, dir, SYNC_FOR_CPU);
swiotlb_sync_single_for_cpu(struct device *hwdev, dma_addr_t dev_addr,			    size_t size, int dir){	swiotlb_sync_single(hwdev, dev_addr, size, dir);}