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0db2e5d1 RM |
1 | /* |
2 | * Copyright (C) 2014-2015 ARM Ltd. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License version 2 as | |
6 | * published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
11 | * GNU General Public License for more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public License | |
14 | * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
15 | */ | |
16 | #ifndef __DMA_IOMMU_H | |
17 | #define __DMA_IOMMU_H | |
18 | ||
19 | #ifdef __KERNEL__ | |
8165c798 | 20 | #include <linux/types.h> |
0db2e5d1 RM |
21 | #include <asm/errno.h> |
22 | ||
23 | #ifdef CONFIG_IOMMU_DMA | |
461a6946 | 24 | #include <linux/dma-mapping.h> |
0db2e5d1 | 25 | #include <linux/iommu.h> |
44bb7e24 | 26 | #include <linux/msi.h> |
0db2e5d1 RM |
27 | |
28 | int iommu_dma_init(void); | |
29 | ||
30 | /* Domain management interface for IOMMU drivers */ | |
31 | int iommu_get_dma_cookie(struct iommu_domain *domain); | |
fdbe574e | 32 | int iommu_get_msi_cookie(struct iommu_domain *domain, dma_addr_t base); |
0db2e5d1 RM |
33 | void iommu_put_dma_cookie(struct iommu_domain *domain); |
34 | ||
35 | /* Setup call for arch DMA mapping code */ | |
fade1ec0 RM |
36 | int iommu_dma_init_domain(struct iommu_domain *domain, dma_addr_t base, |
37 | u64 size, struct device *dev); | |
0db2e5d1 RM |
38 | |
39 | /* General helpers for DMA-API <-> IOMMU-API interaction */ | |
737c85ca MH |
40 | int dma_info_to_prot(enum dma_data_direction dir, bool coherent, |
41 | unsigned long attrs); | |
0db2e5d1 RM |
42 | |
43 | /* | |
44 | * These implement the bulk of the relevant DMA mapping callbacks, but require | |
45 | * the arch code to take care of attributes and cache maintenance | |
46 | */ | |
3b6b7e19 | 47 | struct page **iommu_dma_alloc(struct device *dev, size_t size, gfp_t gfp, |
00085f1e | 48 | unsigned long attrs, int prot, dma_addr_t *handle, |
0db2e5d1 RM |
49 | void (*flush_page)(struct device *, const void *, phys_addr_t)); |
50 | void iommu_dma_free(struct device *dev, struct page **pages, size_t size, | |
51 | dma_addr_t *handle); | |
52 | ||
53 | int iommu_dma_mmap(struct page **pages, size_t size, struct vm_area_struct *vma); | |
54 | ||
55 | dma_addr_t iommu_dma_map_page(struct device *dev, struct page *page, | |
56 | unsigned long offset, size_t size, int prot); | |
57 | int iommu_dma_map_sg(struct device *dev, struct scatterlist *sg, | |
58 | int nents, int prot); | |
59 | ||
60 | /* | |
61 | * Arch code with no special attribute handling may use these | |
62 | * directly as DMA mapping callbacks for simplicity | |
63 | */ | |
64 | void iommu_dma_unmap_page(struct device *dev, dma_addr_t handle, size_t size, | |
00085f1e | 65 | enum dma_data_direction dir, unsigned long attrs); |
0db2e5d1 | 66 | void iommu_dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nents, |
00085f1e | 67 | enum dma_data_direction dir, unsigned long attrs); |
51f8cc9e RM |
68 | dma_addr_t iommu_dma_map_resource(struct device *dev, phys_addr_t phys, |
69 | size_t size, enum dma_data_direction dir, unsigned long attrs); | |
70 | void iommu_dma_unmap_resource(struct device *dev, dma_addr_t handle, | |
71 | size_t size, enum dma_data_direction dir, unsigned long attrs); | |
0db2e5d1 RM |
72 | int iommu_dma_mapping_error(struct device *dev, dma_addr_t dma_addr); |
73 | ||
44bb7e24 RM |
74 | /* The DMA API isn't _quite_ the whole story, though... */ |
75 | void iommu_dma_map_msi_msg(int irq, struct msi_msg *msg); | |
273df963 | 76 | void iommu_dma_get_resv_regions(struct device *dev, struct list_head *list); |
44bb7e24 | 77 | |
0db2e5d1 RM |
78 | #else |
79 | ||
80 | struct iommu_domain; | |
44bb7e24 | 81 | struct msi_msg; |
4b1c8898 | 82 | struct device; |
0db2e5d1 RM |
83 | |
84 | static inline int iommu_dma_init(void) | |
85 | { | |
86 | return 0; | |
87 | } | |
88 | ||
89 | static inline int iommu_get_dma_cookie(struct iommu_domain *domain) | |
90 | { | |
91 | return -ENODEV; | |
92 | } | |
93 | ||
fdbe574e RM |
94 | static inline int iommu_get_msi_cookie(struct iommu_domain *domain, dma_addr_t base) |
95 | { | |
96 | return -ENODEV; | |
97 | } | |
98 | ||
0db2e5d1 RM |
99 | static inline void iommu_put_dma_cookie(struct iommu_domain *domain) |
100 | { | |
101 | } | |
102 | ||
44bb7e24 RM |
103 | static inline void iommu_dma_map_msi_msg(int irq, struct msi_msg *msg) |
104 | { | |
105 | } | |
106 | ||
273df963 RM |
107 | static inline void iommu_dma_get_resv_regions(struct device *dev, struct list_head *list) |
108 | { | |
109 | } | |
110 | ||
0db2e5d1 RM |
111 | #endif /* CONFIG_IOMMU_DMA */ |
112 | #endif /* __KERNEL__ */ | |
113 | #endif /* __DMA_IOMMU_H */ |