| Robin Murphy | 0db2e5d | 2015-10-01 20:13:58 +0100 | [diff] [blame] | 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__ |
| 20 | #include <asm/errno.h> |
| 21 | |
| 22 | #ifdef CONFIG_IOMMU_DMA |
| 23 | #include <linux/iommu.h> |
| 24 | |
| 25 | int iommu_dma_init(void); |
| 26 | |
| 27 | /* Domain management interface for IOMMU drivers */ |
| 28 | int iommu_get_dma_cookie(struct iommu_domain *domain); |
| 29 | void iommu_put_dma_cookie(struct iommu_domain *domain); |
| 30 | |
| 31 | /* Setup call for arch DMA mapping code */ |
| 32 | int iommu_dma_init_domain(struct iommu_domain *domain, dma_addr_t base, u64 size); |
| 33 | |
| 34 | /* General helpers for DMA-API <-> IOMMU-API interaction */ |
| 35 | int dma_direction_to_prot(enum dma_data_direction dir, bool coherent); |
| 36 | |
| 37 | /* |
| 38 | * These implement the bulk of the relevant DMA mapping callbacks, but require |
| 39 | * the arch code to take care of attributes and cache maintenance |
| 40 | */ |
| 41 | struct page **iommu_dma_alloc(struct device *dev, size_t size, |
| 42 | gfp_t gfp, int prot, dma_addr_t *handle, |
| 43 | void (*flush_page)(struct device *, const void *, phys_addr_t)); |
| 44 | void iommu_dma_free(struct device *dev, struct page **pages, size_t size, |
| 45 | dma_addr_t *handle); |
| 46 | |
| 47 | int iommu_dma_mmap(struct page **pages, size_t size, struct vm_area_struct *vma); |
| 48 | |
| 49 | dma_addr_t iommu_dma_map_page(struct device *dev, struct page *page, |
| 50 | unsigned long offset, size_t size, int prot); |
| 51 | int iommu_dma_map_sg(struct device *dev, struct scatterlist *sg, |
| 52 | int nents, int prot); |
| 53 | |
| 54 | /* |
| 55 | * Arch code with no special attribute handling may use these |
| 56 | * directly as DMA mapping callbacks for simplicity |
| 57 | */ |
| 58 | void iommu_dma_unmap_page(struct device *dev, dma_addr_t handle, size_t size, |
| 59 | enum dma_data_direction dir, struct dma_attrs *attrs); |
| 60 | void iommu_dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nents, |
| 61 | enum dma_data_direction dir, struct dma_attrs *attrs); |
| 62 | int iommu_dma_supported(struct device *dev, u64 mask); |
| 63 | int iommu_dma_mapping_error(struct device *dev, dma_addr_t dma_addr); |
| 64 | |
| 65 | #else |
| 66 | |
| 67 | struct iommu_domain; |
| 68 | |
| 69 | static inline int iommu_dma_init(void) |
| 70 | { |
| 71 | return 0; |
| 72 | } |
| 73 | |
| 74 | static inline int iommu_get_dma_cookie(struct iommu_domain *domain) |
| 75 | { |
| 76 | return -ENODEV; |
| 77 | } |
| 78 | |
| 79 | static inline void iommu_put_dma_cookie(struct iommu_domain *domain) |
| 80 | { |
| 81 | } |
| 82 | |
| 83 | #endif /* CONFIG_IOMMU_DMA */ |
| 84 | #endif /* __KERNEL__ */ |
| 85 | #endif /* __DMA_IOMMU_H */ |