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Linux kernel mirror (for testing)
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1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * Copyright (C) 2014-2015 ARM Ltd.
4 */
5#ifndef __DMA_IOMMU_H
6#define __DMA_IOMMU_H
7
8#include <linux/errno.h>
9#include <linux/types.h>
10
11#ifdef CONFIG_IOMMU_DMA
12#include <linux/dma-mapping.h>
13#include <linux/iommu.h>
14#include <linux/msi.h>
15
16/* Domain management interface for IOMMU drivers */
17int iommu_get_dma_cookie(struct iommu_domain *domain);
18int iommu_get_msi_cookie(struct iommu_domain *domain, dma_addr_t base);
19void iommu_put_dma_cookie(struct iommu_domain *domain);
20
21/* Setup call for arch DMA mapping code */
22void iommu_setup_dma_ops(struct device *dev, u64 dma_base, u64 dma_limit);
23int iommu_dma_init_fq(struct iommu_domain *domain);
24
25/* The DMA API isn't _quite_ the whole story, though... */
26/*
27 * iommu_dma_prepare_msi() - Map the MSI page in the IOMMU device
28 *
29 * The MSI page will be stored in @desc.
30 *
31 * Return: 0 on success otherwise an error describing the failure.
32 */
33int iommu_dma_prepare_msi(struct msi_desc *desc, phys_addr_t msi_addr);
34
35/* Update the MSI message if required. */
36void iommu_dma_compose_msi_msg(struct msi_desc *desc,
37 struct msi_msg *msg);
38
39void iommu_dma_get_resv_regions(struct device *dev, struct list_head *list);
40
41void iommu_dma_free_cpu_cached_iovas(unsigned int cpu,
42 struct iommu_domain *domain);
43
44extern bool iommu_dma_forcedac;
45
46#else /* CONFIG_IOMMU_DMA */
47
48struct iommu_domain;
49struct msi_desc;
50struct msi_msg;
51struct device;
52
53static inline void iommu_setup_dma_ops(struct device *dev, u64 dma_base,
54 u64 dma_limit)
55{
56}
57
58static inline int iommu_dma_init_fq(struct iommu_domain *domain)
59{
60 return -EINVAL;
61}
62
63static inline int iommu_get_dma_cookie(struct iommu_domain *domain)
64{
65 return -ENODEV;
66}
67
68static inline int iommu_get_msi_cookie(struct iommu_domain *domain, dma_addr_t base)
69{
70 return -ENODEV;
71}
72
73static inline void iommu_put_dma_cookie(struct iommu_domain *domain)
74{
75}
76
77static inline int iommu_dma_prepare_msi(struct msi_desc *desc,
78 phys_addr_t msi_addr)
79{
80 return 0;
81}
82
83static inline void iommu_dma_compose_msi_msg(struct msi_desc *desc,
84 struct msi_msg *msg)
85{
86}
87
88static inline void iommu_dma_get_resv_regions(struct device *dev, struct list_head *list)
89{
90}
91
92#endif /* CONFIG_IOMMU_DMA */
93#endif /* __DMA_IOMMU_H */