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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 size);
23
24/* The DMA API isn't _quite_ the whole story, though... */
25/*
26 * iommu_dma_prepare_msi() - Map the MSI page in the IOMMU device
27 *
28 * The MSI page will be stored in @desc.
29 *
30 * Return: 0 on success otherwise an error describing the failure.
31 */
32int iommu_dma_prepare_msi(struct msi_desc *desc, phys_addr_t msi_addr);
33
34/* Update the MSI message if required. */
35void iommu_dma_compose_msi_msg(struct msi_desc *desc,
36 struct msi_msg *msg);
37
38void iommu_dma_get_resv_regions(struct device *dev, struct list_head *list);
39
40void iommu_dma_free_cpu_cached_iovas(unsigned int cpu,
41 struct iommu_domain *domain);
42
43#else /* CONFIG_IOMMU_DMA */
44
45struct iommu_domain;
46struct msi_desc;
47struct msi_msg;
48struct device;
49
50static inline void iommu_setup_dma_ops(struct device *dev, u64 dma_base,
51 u64 size)
52{
53}
54
55static inline int iommu_get_dma_cookie(struct iommu_domain *domain)
56{
57 return -ENODEV;
58}
59
60static inline int iommu_get_msi_cookie(struct iommu_domain *domain, dma_addr_t base)
61{
62 return -ENODEV;
63}
64
65static inline void iommu_put_dma_cookie(struct iommu_domain *domain)
66{
67}
68
69static inline int iommu_dma_prepare_msi(struct msi_desc *desc,
70 phys_addr_t msi_addr)
71{
72 return 0;
73}
74
75static inline void iommu_dma_compose_msi_msg(struct msi_desc *desc,
76 struct msi_msg *msg)
77{
78}
79
80static inline void iommu_dma_get_resv_regions(struct device *dev, struct list_head *list)
81{
82}
83
84static inline void iommu_dma_free_cpu_cached_iovas(unsigned int cpu,
85 struct iommu_domain *domain)
86{
87}
88
89#endif /* CONFIG_IOMMU_DMA */
90#endif /* __DMA_IOMMU_H */