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_mapping_error(...) (0)
28
29#define dma_unmap_single(d, a, s, r) do { (void)(d); (void)(a); (void)(s); (void)(r); } while (0)
30#define dma_unmap_page(d, a, s, r) do { (void)(d); (void)(a); (void)(s); (void)(r); } while (0)
31
32#define dma_max_mapping_size(...) SIZE_MAX
33
34#endif

 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_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