1 #ifndef _LINUX_DMA_MAPPING_H 2 #define _LINUX_DMA_MAPPING_H 3 4 #ifdef CONFIG_HAS_DMA 5 # error Virtio userspace code does not support CONFIG_HAS_DMA 6 #endif 7 8 #define PCI_DMA_BUS_IS_PHYS 1 9 10 enum dma_data_direction { 11 DMA_BIDIRECTIONAL = 0, 12 DMA_TO_DEVICE = 1, 13 DMA_FROM_DEVICE = 2, 14 DMA_NONE = 3, 15 }; 16 17 #define dma_alloc_coherent(d, s, hp, f) ({ \ 18 void *__dma_alloc_coherent_p = kmalloc((s), (f)); \ 19 *(hp) = (unsigned long)__dma_alloc_coherent_p; \ 20 __dma_alloc_coherent_p; \ 21 }) 22 23 #define dma_free_coherent(d, s, p, h) kfree(p) 24 25 #define dma_map_page(d, p, o, s, dir) (page_to_phys(p) + (o)) 26 27 #define dma_map_single(d, p, s, dir) (virt_to_phys(p)) 28 #define dma_mapping_error(...) (0) 29 30 #define dma_unmap_single(...) do { } while (0) 31 #define dma_unmap_page(...) do { } while (0) 32 33 #endif 34