2 * Copyright (C) 2014-2015 ARM Ltd.
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.
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.
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/>.
20 #include <linux/types.h>
21 #include <asm/errno.h>
23 #ifdef CONFIG_IOMMU_DMA
24 #include <linux/dma-mapping.h>
25 #include <linux/iommu.h>
26 #include <linux/msi.h>
28 int iommu_dma_init(void);
30 /* Domain management interface for IOMMU drivers */
31 int iommu_get_dma_cookie(struct iommu_domain
*domain
);
32 int iommu_get_msi_cookie(struct iommu_domain
*domain
, dma_addr_t base
);
33 void iommu_put_dma_cookie(struct iommu_domain
*domain
);
35 /* Setup call for arch DMA mapping code */
36 int iommu_dma_init_domain(struct iommu_domain
*domain
, dma_addr_t base
,
37 u64 size
, struct device
*dev
);
39 /* General helpers for DMA-API <-> IOMMU-API interaction */
40 int dma_info_to_prot(enum dma_data_direction dir
, bool coherent
,
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
47 struct page
**iommu_dma_alloc(struct device
*dev
, size_t size
, gfp_t gfp
,
48 unsigned long attrs
, int prot
, dma_addr_t
*handle
,
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
,
53 int iommu_dma_mmap(struct page
**pages
, size_t size
, struct vm_area_struct
*vma
);
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
,
61 * Arch code with no special attribute handling may use these
62 * directly as DMA mapping callbacks for simplicity
64 void iommu_dma_unmap_page(struct device
*dev
, dma_addr_t handle
, size_t size
,
65 enum dma_data_direction dir
, unsigned long attrs
);
66 void iommu_dma_unmap_sg(struct device
*dev
, struct scatterlist
*sg
, int nents
,
67 enum dma_data_direction dir
, unsigned long attrs
);
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
);
72 int iommu_dma_mapping_error(struct device
*dev
, dma_addr_t dma_addr
);
74 /* The DMA API isn't _quite_ the whole story, though... */
75 void iommu_dma_map_msi_msg(int irq
, struct msi_msg
*msg
);
76 void iommu_dma_get_resv_regions(struct device
*dev
, struct list_head
*list
);
84 static inline int iommu_dma_init(void)
89 static inline int iommu_get_dma_cookie(struct iommu_domain
*domain
)
94 static inline int iommu_get_msi_cookie(struct iommu_domain
*domain
, dma_addr_t base
)
99 static inline void iommu_put_dma_cookie(struct iommu_domain
*domain
)
103 static inline void iommu_dma_map_msi_msg(int irq
, struct msi_msg
*msg
)
107 static inline void iommu_dma_get_resv_regions(struct device
*dev
, struct list_head
*list
)
111 #endif /* CONFIG_IOMMU_DMA */
112 #endif /* __KERNEL__ */
113 #endif /* __DMA_IOMMU_H */