Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
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#define PCI_DMA_BUS_IS_PHYS 1
10
11enum dma_data_direction {
12 DMA_BIDIRECTIONAL = 0,
13 DMA_TO_DEVICE = 1,
14 DMA_FROM_DEVICE = 2,
15 DMA_NONE = 3,
16};
17
18#define dma_alloc_coherent(d, s, hp, f) ({ \
19 void *__dma_alloc_coherent_p = kmalloc((s), (f)); \
20 *(hp) = (unsigned long)__dma_alloc_coherent_p; \
21 __dma_alloc_coherent_p; \
22})
23
24#define dma_free_coherent(d, s, p, h) kfree(p)
25
26#define dma_map_page(d, p, o, s, dir) (page_to_phys(p) + (o))
27
28#define dma_map_single(d, p, s, dir) (virt_to_phys(p))
29#define dma_mapping_error(...) (0)
30
31#define dma_unmap_single(...) do { } while (0)
32#define dma_unmap_page(...) do { } while (0)
33
34#endif