dma_unmap_page
dma_unmap_page(vm->dma, p->daddr, PAGE_SIZE, PCI_DMA_BIDIRECTIONAL);
dma_unmap_page(vm->dma, addr, size, PCI_DMA_BIDIRECTIONAL);
dma_unmap_page(vm->dma, p->daddr, BIT(p->order) << PAGE_SHIFT,
dma_unmap_page(dev, tt->dma_address[i], num_pages * PAGE_SIZE,
dma_unmap_page(dev, tt->dma_address[i],