projects / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 19c65c3d CH |
1 | /* SPDX-License-Identifier: GPL-2.0 */ |
| 2 | /* | |
| 3 | * Copyright (C) 2018 Christoph Hellwig. | |
| 4 | * | |
| 5 | * DMA operations that map physical memory directly without using an IOMMU. | |
| 6 | */ | |
| 7 | #ifndef _KERNEL_DMA_DIRECT_H | |
| 8 | #define _KERNEL_DMA_DIRECT_H | |
| 9 | ||
| 10 | #include <linux/dma-direct.h> | |
| 11 | ||
| 12 | int dma_direct_get_sgtable(struct device *dev, struct sg_table *sgt, | |
| 13 | void *cpu_addr, dma_addr_t dma_addr, size_t size, | |
| 14 | unsigned long attrs); | |
| 15 | bool dma_direct_can_mmap(struct device *dev); | |
| 16 | int dma_direct_mmap(struct device *dev, struct vm_area_struct *vma, | |
| 17 | void *cpu_addr, dma_addr_t dma_addr, size_t size, | |
| 18 | unsigned long attrs); | |
| 19 | bool dma_direct_need_sync(struct device *dev, dma_addr_t dma_addr); | |
| 20 | int dma_direct_map_sg(struct device *dev, struct scatterlist *sgl, int nents, | |
| 21 | enum dma_data_direction dir, unsigned long attrs); | |
| 22 | size_t dma_direct_max_mapping_size(struct device *dev); | |
| 23 | ||
| 24 | #if defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_DEVICE) || \ | |
| 25 | defined(CONFIG_SWIOTLB) | |
| 26 | void dma_direct_sync_sg_for_device(struct device *dev, struct scatterlist *sgl, | |
| 27 | int nents, enum dma_data_direction dir); | |
| 28 | #else | |
| 29 | static inline void dma_direct_sync_sg_for_device(struct device *dev, | |
| 30 | struct scatterlist *sgl, int nents, enum dma_data_direction dir) | |
| 31 | { | |
| 32 | } | |
| 33 | #endif | |
| 34 | ||
| 35 | #if defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU) || \ | |
| 36 | defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU_ALL) || \ | |
| 37 | defined(CONFIG_SWIOTLB) | |
| 38 | void dma_direct_unmap_sg(struct device *dev, struct scatterlist *sgl, | |
| 39 | int nents, enum dma_data_direction dir, unsigned long attrs); | |
| 40 | void dma_direct_sync_sg_for_cpu(struct device *dev, | |
| 41 | struct scatterlist *sgl, int nents, enum dma_data_direction dir); | |
| 42 | #else | |
| 43 | static inline void dma_direct_unmap_sg(struct device *dev, | |
| 44 | struct scatterlist *sgl, int nents, enum dma_data_direction dir, | |
| 45 | unsigned long attrs) | |
| 46 | { | |
| 47 | } | |
| 48 | static inline void dma_direct_sync_sg_for_cpu(struct device *dev, | |
| 49 | struct scatterlist *sgl, int nents, enum dma_data_direction dir) | |
| 50 | { | |
| 51 | } | |
| 52 | #endif | |
| 53 | ||
| 54 | static inline void dma_direct_sync_single_for_device(struct device *dev, | |
| 55 | dma_addr_t addr, size_t size, enum dma_data_direction dir) | |
| 56 | { | |
| 57 | phys_addr_t paddr = dma_to_phys(dev, addr); | |
| 58 | ||
| 59 | if (unlikely(is_swiotlb_buffer(paddr))) | |
| 60 | swiotlb_tbl_sync_single(dev, paddr, size, dir, SYNC_FOR_DEVICE); | |
| 61 | ||
| 62 | if (!dev_is_dma_coherent(dev)) | |
| 63 | arch_sync_dma_for_device(paddr, size, dir); | |
| 64 | } | |
| 65 | ||
| 66 | static inline void dma_direct_sync_single_for_cpu(struct device *dev, | |
| 67 | dma_addr_t addr, size_t size, enum dma_data_direction dir) | |
| 68 | { | |
| 69 | phys_addr_t paddr = dma_to_phys(dev, addr); | |
| 70 | ||
| 71 | if (!dev_is_dma_coherent(dev)) { | |
| 72 | arch_sync_dma_for_cpu(paddr, size, dir); | |
| 73 | arch_sync_dma_for_cpu_all(); | |
| 74 | } | |
| 75 | ||
| 76 | if (unlikely(is_swiotlb_buffer(paddr))) | |
| 77 | swiotlb_tbl_sync_single(dev, paddr, size, dir, SYNC_FOR_CPU); | |
| 78 | ||
| 79 | if (dir == DMA_FROM_DEVICE) | |
| 80 | arch_dma_mark_clean(paddr, size); | |
| 81 | } | |
| 82 | ||
| 83 | static inline dma_addr_t dma_direct_map_page(struct device *dev, | |
| 84 | struct page *page, unsigned long offset, size_t size, | |
| 85 | enum dma_data_direction dir, unsigned long attrs) | |
| 86 | { | |
| 87 | phys_addr_t phys = page_to_phys(page) + offset; | |
| 88 | dma_addr_t dma_addr = phys_to_dma(dev, phys); | |
| 89 | ||
| 90 | if (unlikely(swiotlb_force == SWIOTLB_FORCE)) | |
| 91 | return swiotlb_map(dev, phys, size, dir, attrs); | |
| 92 | ||
| 93 | if (unlikely(!dma_capable(dev, dma_addr, size, true))) { | |
| 94 | if (swiotlb_force != SWIOTLB_NO_FORCE) | |
| 95 | return swiotlb_map(dev, phys, size, dir, attrs); | |
| 96 | ||
| 97 | dev_WARN_ONCE(dev, 1, | |
| 98 | "DMA addr %pad+%zu overflow (mask %llx, bus limit %llx).\n", | |
| 99 | &dma_addr, size, *dev->dma_mask, dev->bus_dma_limit); | |
| 100 | return DMA_MAPPING_ERROR; | |
| 101 | } | |
| 102 | ||
| 103 | if (!dev_is_dma_coherent(dev) && !(attrs & DMA_ATTR_SKIP_CPU_SYNC)) | |
| 104 | arch_sync_dma_for_device(phys, size, dir); | |
| 105 | return dma_addr; | |
| 106 | } | |
| 107 | ||
| 108 | static inline void dma_direct_unmap_page(struct device *dev, dma_addr_t addr, | |
| 109 | size_t size, enum dma_data_direction dir, unsigned long attrs) | |
| 110 | { | |
| 111 | phys_addr_t phys = dma_to_phys(dev, addr); | |
| 112 | ||
| 113 | if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC)) | |
| 114 | dma_direct_sync_single_for_cpu(dev, addr, size, dir); | |
| 115 | ||
| 116 | if (unlikely(is_swiotlb_buffer(phys))) | |
| 117 | swiotlb_tbl_unmap_single(dev, phys, size, size, dir, attrs); | |
| 118 | } | |
| 119 | #endif /* _KERNEL_DMA_DIRECT_H */ |