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 | #include <linux/memremap.h> |
12 | |
13 | int dma_direct_get_sgtable(struct device *dev, struct sg_table *sgt, |
14 | void *cpu_addr, dma_addr_t dma_addr, size_t size, |
15 | unsigned long attrs); |
16 | bool dma_direct_can_mmap(struct device *dev); |
17 | int dma_direct_mmap(struct device *dev, struct vm_area_struct *vma, |
18 | void *cpu_addr, dma_addr_t dma_addr, size_t size, |
19 | unsigned long attrs); |
20 | bool dma_direct_need_sync(struct device *dev, dma_addr_t dma_addr); |
21 | int dma_direct_map_sg(struct device *dev, struct scatterlist *sgl, int nents, |
22 | enum dma_data_direction dir, unsigned long attrs); |
23 | bool dma_direct_all_ram_mapped(struct device *dev); |
24 | size_t dma_direct_max_mapping_size(struct device *dev); |
25 | |
26 | #if defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_DEVICE) || \ |
27 | defined(CONFIG_SWIOTLB) |
28 | void dma_direct_sync_sg_for_device(struct device *dev, struct scatterlist *sgl, |
29 | int nents, enum dma_data_direction dir); |
30 | #else |
31 | static inline void dma_direct_sync_sg_for_device(struct device *dev, |
32 | struct scatterlist *sgl, int nents, enum dma_data_direction dir) |
33 | { |
34 | } |
35 | #endif |
36 | |
37 | #if defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU) || \ |
38 | defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU_ALL) || \ |
39 | defined(CONFIG_SWIOTLB) |
40 | void dma_direct_unmap_sg(struct device *dev, struct scatterlist *sgl, |
41 | int nents, enum dma_data_direction dir, unsigned long attrs); |
42 | void dma_direct_sync_sg_for_cpu(struct device *dev, |
43 | struct scatterlist *sgl, int nents, enum dma_data_direction dir); |
44 | #else |
45 | static inline void dma_direct_unmap_sg(struct device *dev, |
46 | struct scatterlist *sgl, int nents, enum dma_data_direction dir, |
47 | unsigned long attrs) |
48 | { |
49 | } |
50 | static inline void dma_direct_sync_sg_for_cpu(struct device *dev, |
51 | struct scatterlist *sgl, int nents, enum dma_data_direction dir) |
52 | { |
53 | } |
54 | #endif |
55 | |
56 | static inline void dma_direct_sync_single_for_device(struct device *dev, |
57 | dma_addr_t addr, size_t size, enum dma_data_direction dir) |
58 | { |
59 | phys_addr_t paddr = dma_to_phys(dev, dma_addr: addr); |
60 | |
61 | if (unlikely(is_swiotlb_buffer(dev, paddr))) |
62 | swiotlb_sync_single_for_device(dev, tlb_addr: paddr, size, dir); |
63 | |
64 | if (!dev_is_dma_coherent(dev)) |
65 | arch_sync_dma_for_device(paddr, size, dir); |
66 | } |
67 | |
68 | static inline void dma_direct_sync_single_for_cpu(struct device *dev, |
69 | dma_addr_t addr, size_t size, enum dma_data_direction dir) |
70 | { |
71 | phys_addr_t paddr = dma_to_phys(dev, dma_addr: addr); |
72 | |
73 | if (!dev_is_dma_coherent(dev)) { |
74 | arch_sync_dma_for_cpu(paddr, size, dir); |
75 | arch_sync_dma_for_cpu_all(); |
76 | } |
77 | |
78 | if (unlikely(is_swiotlb_buffer(dev, paddr))) |
79 | swiotlb_sync_single_for_cpu(dev, tlb_addr: paddr, size, dir); |
80 | |
81 | if (dir == DMA_FROM_DEVICE) |
82 | arch_dma_mark_clean(paddr, size); |
83 | } |
84 | |
85 | static inline dma_addr_t dma_direct_map_page(struct device *dev, |
86 | struct page *page, unsigned long offset, size_t size, |
87 | enum dma_data_direction dir, unsigned long attrs) |
88 | { |
89 | phys_addr_t phys = page_to_phys(page) + offset; |
90 | dma_addr_t dma_addr = phys_to_dma(dev, paddr: phys); |
91 | |
92 | if (is_swiotlb_force_bounce(dev)) { |
93 | if (is_pci_p2pdma_page(page)) |
94 | return DMA_MAPPING_ERROR; |
95 | return swiotlb_map(dev, phys, size, dir, attrs); |
96 | } |
97 | |
98 | if (unlikely(!dma_capable(dev, dma_addr, size, true)) || |
99 | dma_kmalloc_needs_bounce(dev, size, dir)) { |
100 | if (is_pci_p2pdma_page(page)) |
101 | return DMA_MAPPING_ERROR; |
102 | if (is_swiotlb_active(dev)) |
103 | return swiotlb_map(dev, phys, size, dir, attrs); |
104 | |
105 | dev_WARN_ONCE(dev, 1, |
106 | "DMA addr %pad+%zu overflow (mask %llx, bus limit %llx).\n" , |
107 | &dma_addr, size, *dev->dma_mask, dev->bus_dma_limit); |
108 | return DMA_MAPPING_ERROR; |
109 | } |
110 | |
111 | if (!dev_is_dma_coherent(dev) && !(attrs & DMA_ATTR_SKIP_CPU_SYNC)) |
112 | arch_sync_dma_for_device(paddr: phys, size, dir); |
113 | return dma_addr; |
114 | } |
115 | |
116 | static inline void dma_direct_unmap_page(struct device *dev, dma_addr_t addr, |
117 | size_t size, enum dma_data_direction dir, unsigned long attrs) |
118 | { |
119 | phys_addr_t phys = dma_to_phys(dev, dma_addr: addr); |
120 | |
121 | if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC)) |
122 | dma_direct_sync_single_for_cpu(dev, addr, size, dir); |
123 | |
124 | if (unlikely(is_swiotlb_buffer(dev, phys))) |
125 | swiotlb_tbl_unmap_single(hwdev: dev, tlb_addr: phys, mapping_size: size, dir, |
126 | attrs: attrs | DMA_ATTR_SKIP_CPU_SYNC); |
127 | } |
128 | #endif /* _KERNEL_DMA_DIRECT_H */ |
129 | |