+#ifdef SWIOTLB_ARCH_NEED_MAP_PAGE
+
+dma_addr_t
+swiotlb_map_page(struct device *hwdev, struct page *page,
+ unsigned long offset, size_t size,
+ enum dma_data_direction direction)
+{
+ dma_addr_t dev_addr;
+ char *map;
+
+ dev_addr = page_to_bus(page) + offset;
+ if (address_needs_mapping(hwdev, dev_addr)) {
+ map = map_single(hwdev, page_to_io_tlb_addr(page, offset), size, direction);
+ if (!map) {
+ swiotlb_full(hwdev, size, direction, 1);
+ map = io_tlb_overflow_buffer;
+ }
+ dev_addr = virt_to_bus(map);
+ }
+
+ return dev_addr;
+}
+
+void
+swiotlb_unmap_page(struct device *hwdev, dma_addr_t dev_addr,
+ size_t size, enum dma_data_direction direction)
+{
+ char *dma_addr = bus_to_virt(dev_addr);
+
+ BUG_ON(direction == DMA_NONE);
+ if (dma_addr >= io_tlb_start && dma_addr < io_tlb_end)
+ unmap_single(hwdev, dma_addr, size, direction);
+ else if (direction == DMA_FROM_DEVICE)
+ dma_mark_clean(dma_addr, size);
+}
+
+#endif
+