1/* SPDX-License-Identifier: GPL-2.0 */ 2#ifndef _LINUX_DMA_MAPPING_H 3#define _LINUX_DMA_MAPPING_H 4 5#ifdef CONFIG_HAS_DMA 6# error Virtio userspace code does not support CONFIG_HAS_DMA 7#endif 8 9enum dma_data_direction { 10 DMA_BIDIRECTIONAL = 0, 11 DMA_TO_DEVICE = 1, 12 DMA_FROM_DEVICE = 2, 13 DMA_NONE = 3, 14}; 15 16#define dma_alloc_coherent(d, s, hp, f) ({ \ 17 void *__dma_alloc_coherent_p = kmalloc((s), (f)); \ 18 *(hp) = (unsigned long)__dma_alloc_coherent_p; \ 19 __dma_alloc_coherent_p; \ 20}) 21 22#define dma_free_coherent(d, s, p, h) kfree(p) 23 24#define dma_map_page(d, p, o, s, dir) (page_to_phys(p) + (o)) 25 26#define dma_map_single(d, p, s, dir) (virt_to_phys(p)) 27#define dma_map_single_attrs(d, p, s, dir, a) (virt_to_phys(p)) 28#define dma_mapping_error(...) (0) 29 30#define dma_unmap_single(d, a, s, r) do { (void)(d); (void)(a); (void)(s); (void)(r); } while (0) 31#define dma_unmap_page(d, a, s, r) do { (void)(d); (void)(a); (void)(s); (void)(r); } while (0) 32 33#define sg_dma_address(sg) (0) 34#define dma_need_sync(v, a) (0) 35#define dma_unmap_single_attrs(d, a, s, r, t) do { \ 36 (void)(d); (void)(a); (void)(s); (void)(r); (void)(t); \ 37} while (0) 38#define dma_sync_single_range_for_cpu(d, a, o, s, r) do { \ 39 (void)(d); (void)(a); (void)(o); (void)(s); (void)(r); \ 40} while (0) 41#define dma_sync_single_range_for_device(d, a, o, s, r) do { \ 42 (void)(d); (void)(a); (void)(o); (void)(s); (void)(r); \ 43} while (0) 44#define dma_max_mapping_size(...) SIZE_MAX 45 46#endif 47