1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _ASM_X86_DMA_MAPPING_H
3#define _ASM_X86_DMA_MAPPING_H
4
5/*
6 * IOMMU interface. See Documentation/DMA-API-HOWTO.txt and
7 * Documentation/DMA-API.txt for documentation.
8 */
9
10#include <linux/scatterlist.h>
11#include <linux/dma-debug.h>
12#include <asm/io.h>
13#include <asm/swiotlb.h>
14#include <linux/dma-contiguous.h>
15
16#ifdef CONFIG_ISA
17# define ISA_DMA_BIT_MASK DMA_BIT_MASK(24)
18#else
19# define ISA_DMA_BIT_MASK DMA_BIT_MASK(32)
20#endif
21
22extern int iommu_merge;
23extern struct device x86_dma_fallback_dev;
24extern int panic_on_overflow;
25
26extern const struct dma_map_ops *dma_ops;
27
28static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)
29{
30 return dma_ops;
31}
32
33bool arch_dma_alloc_attrs(struct device **dev);
34#define arch_dma_alloc_attrs arch_dma_alloc_attrs
35
36#endif
37