/* SPDX-License-Identifier: GPL-2.0 */#ifndef _LINUX_DMA_MAPPING_H#define _LINUX_DMA_MAPPING_H #ifdef CONFIG_HAS_DMA# error Virtio userspace code does not support CONFIG_HAS_DMA#endif enum dma_data_direction {	DMA_BIDIRECTIONAL = 0,	DMA_TO_DEVICE = 1,	DMA_FROM_DEVICE = 2,	DMA_NONE = 3,}; #define dma_alloc_coherent(d, s, hp, f) ({ \	void *__dma_alloc_coherent_p = kmalloc((s), (f)); \	*(hp) = (unsigned long)__dma_alloc_coherent_p; \	__dma_alloc_coherent_p; \}) #define dma_free_coherent(d, s, p, h) kfree(p) #define dma_map_page(d, p, o, s, dir) (page_to_phys(p) + (o))#define dma_map_page_attrs(d, p, o, s, dir, a) (page_to_phys(p) + (o)) #define dma_map_single(d, p, s, dir) (virt_to_phys(p))#define dma_map_single_attrs(d, p, s, dir, a) (virt_to_phys(p))#define dma_mapping_error(...) (0) #define dma_unmap_single(d, a, s, r) do { (void)(d); (void)(a); (void)(s); (void)(r); } while (0)#define dma_unmap_page(d, a, s, r) do { (void)(d); (void)(a); (void)(s); (void)(r); } while (0)#define dma_unmap_page_attrs(d, a, s, r, t) do { \	(void)(d); (void)(a); (void)(s); (void)(r); (void)(t); \} while (0) #define sg_dma_address(sg) (0)#define sg_dma_len(sg) (0)#define dma_need_sync(v, a) (0)#define dma_unmap_single_attrs(d, a, s, r, t) do { \	(void)(d); (void)(a); (void)(s); (void)(r); (void)(t); \} while (0)#define dma_sync_single_range_for_cpu(d, a, o, s, r) do { \	(void)(d); (void)(a); (void)(o); (void)(s); (void)(r); \} while (0)#define dma_sync_single_range_for_device(d, a, o, s, r) do { \	(void)(d); (void)(a); (void)(o); (void)(s); (void)(r); \} while (0)#define dma_max_mapping_size(...) SIZE_MAX /* * A dma_addr_t can hold any valid DMA or bus address for the platform.  It can * be given to a device to use as a DMA source or target.  It is specific to a * given device and there may be a translation between the CPU physical address * space and the bus address space. * * DMA_MAPPING_ERROR is the magic error code if a mapping failed.  It should not * be used directly in drivers, but checked for using dma_mapping_error() * instead. */#define DMA_MAPPING_ERROR		(~(dma_addr_t)0) #define DMA_ATTR_CPU_CACHE_CLEAN	(1UL << 11)#define DMA_ATTR_DEBUGGING_IGNORE_CACHELINES	0 #endif