swiotlb_align_offset
unsigned int offset = swiotlb_align_offset(dev, 0, orig_addr);
offset = swiotlb_align_offset(dev, alloc_align_mask, orig_addr);
unsigned int offset = swiotlb_align_offset(dev, 0, tlb_addr);
swiotlb_align_offset(dev, 0, orig_addr);