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1/* SPDX-License-Identifier: GPL-2.0 */2#ifndef _LINUX_DMA_MAPPING_H3#define _LINUX_DMA_MAPPING_H4 5#ifdef CONFIG_HAS_DMA6# error Virtio userspace code does not support CONFIG_HAS_DMA7#endif8 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_MAX45 46#endif47