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 
9 enum 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_mapping_error(...) (0)
28 
29 #define dma_unmap_single(...) do { } while (0)
30 #define dma_unmap_page(...) do { } while (0)
31 
32 #define dma_max_mapping_size(...) SIZE_MAX
33 
34 #endif
35