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 */
17 int iommu_get_dma_cookie(struct iommu_domain *domain);
18 int iommu_get_msi_cookie(struct iommu_domain *domain, dma_addr_t base);
19 void iommu_put_dma_cookie(struct iommu_domain *domain);
20
21 /* Setup call for arch DMA mapping code */
22 void iommu_setup_dma_ops(struct device *dev, u64 dma_base, u64 dma_limit);
23 int 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 */
33 int iommu_dma_prepare_msi(struct msi_desc *desc, phys_addr_t msi_addr);
34
35 /* Update the MSI message if required. */
36 void iommu_dma_compose_msi_msg(struct msi_desc *desc,
37 struct msi_msg *msg);
38
39 void iommu_dma_get_resv_regions(struct device *dev, struct list_head *list);
40
41 void iommu_dma_free_cpu_cached_iovas(unsigned int cpu,
42 struct iommu_domain *domain);
43
44 extern bool iommu_dma_forcedac;
45
46 #else /* CONFIG_IOMMU_DMA */
47
48 struct iommu_domain;
49 struct msi_desc;
50 struct msi_msg;
51 struct device;
52
iommu_setup_dma_ops(struct device * dev,u64 dma_base,u64 dma_limit)53 static inline void iommu_setup_dma_ops(struct device *dev, u64 dma_base,
54 u64 dma_limit)
55 {
56 }
57
iommu_dma_init_fq(struct iommu_domain * domain)58 static inline int iommu_dma_init_fq(struct iommu_domain *domain)
59 {
60 return -EINVAL;
61 }
62
iommu_get_dma_cookie(struct iommu_domain * domain)63 static inline int iommu_get_dma_cookie(struct iommu_domain *domain)
64 {
65 return -ENODEV;
66 }
67
iommu_get_msi_cookie(struct iommu_domain * domain,dma_addr_t base)68 static inline int iommu_get_msi_cookie(struct iommu_domain *domain, dma_addr_t base)
69 {
70 return -ENODEV;
71 }
72
iommu_put_dma_cookie(struct iommu_domain * domain)73 static inline void iommu_put_dma_cookie(struct iommu_domain *domain)
74 {
75 }
76
iommu_dma_prepare_msi(struct msi_desc * desc,phys_addr_t msi_addr)77 static inline int iommu_dma_prepare_msi(struct msi_desc *desc,
78 phys_addr_t msi_addr)
79 {
80 return 0;
81 }
82
iommu_dma_compose_msi_msg(struct msi_desc * desc,struct msi_msg * msg)83 static inline void iommu_dma_compose_msi_msg(struct msi_desc *desc,
84 struct msi_msg *msg)
85 {
86 }
87
iommu_dma_get_resv_regions(struct device * dev,struct list_head * list)88 static 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 */
94
