1 #ifndef __LINUX_SWIOTLB_H
2 #define __LINUX_SWIOTLB_H
3
4 #include <linux/types.h>
5
6 struct device;
7 struct dma_attrs;
8 struct scatterlist;
9
10 extern int swiotlb_force;
11
12 /*
13 * Maximum allowable number of contiguous slabs to map,
14 * must be a power of 2. What is the appropriate value ?
15 * The complexity of {map,unmap}_single is linearly dependent on this value.
16 */
17 #define IO_TLB_SEGSIZE 128
18
19 /*
20 * log of the size of each IO TLB slab. The number of slabs is command line
21 * controllable.
22 */
23 #define IO_TLB_SHIFT 11
24
25 extern void swiotlb_init(int verbose);
26 int swiotlb_init_with_tbl(char *tlb, unsigned long nslabs, int verbose);
27 extern unsigned long swiotlb_nr_tbl(void);
28 unsigned long swiotlb_size_or_default(void);
29 extern int swiotlb_late_init_with_tbl(char *tlb, unsigned long nslabs);
30
31 /*
32 * Enumeration for sync targets
33 */
34 enum dma_sync_target {
35 SYNC_FOR_CPU = 0,
36 SYNC_FOR_DEVICE = 1,
37 };
38
39 /* define the last possible byte of physical address space as a mapping error */
40 #define SWIOTLB_MAP_ERROR (~(phys_addr_t)0x0)
41
42 extern phys_addr_t swiotlb_tbl_map_single(struct device *hwdev,
43 dma_addr_t tbl_dma_addr,
44 phys_addr_t phys, size_t size,
45 enum dma_data_direction dir);
46
47 extern void swiotlb_tbl_unmap_single(struct device *hwdev,
48 phys_addr_t tlb_addr,
49 size_t size, enum dma_data_direction dir);
50
51 extern void swiotlb_tbl_sync_single(struct device *hwdev,
52 phys_addr_t tlb_addr,
53 size_t size, enum dma_data_direction dir,
54 enum dma_sync_target target);
55
56 /* Accessory functions. */
57 extern void
58 *swiotlb_alloc_coherent(struct device *hwdev, size_t size,
59 dma_addr_t *dma_handle, gfp_t flags);
60
61 extern void
62 swiotlb_free_coherent(struct device *hwdev, size_t size,
63 void *vaddr, dma_addr_t dma_handle);
64
65 extern dma_addr_t swiotlb_map_page(struct device *dev, struct page *page,
66 unsigned long offset, size_t size,
67 enum dma_data_direction dir,
68 struct dma_attrs *attrs);
69 extern void swiotlb_unmap_page(struct device *hwdev, dma_addr_t dev_addr,
70 size_t size, enum dma_data_direction dir,
71 struct dma_attrs *attrs);
72
73 extern int
74 swiotlb_map_sg(struct device *hwdev, struct scatterlist *sg, int nents,
75 enum dma_data_direction dir);
76
77 extern void
78 swiotlb_unmap_sg(struct device *hwdev, struct scatterlist *sg, int nents,
79 enum dma_data_direction dir);
80
81 extern int
82 swiotlb_map_sg_attrs(struct device *hwdev, struct scatterlist *sgl, int nelems,
83 enum dma_data_direction dir, struct dma_attrs *attrs);
84
85 extern void
86 swiotlb_unmap_sg_attrs(struct device *hwdev, struct scatterlist *sgl,
87 int nelems, enum dma_data_direction dir,
88 struct dma_attrs *attrs);
89
90 extern void
91 swiotlb_sync_single_for_cpu(struct device *hwdev, dma_addr_t dev_addr,
92 size_t size, enum dma_data_direction dir);
93
94 extern void
95 swiotlb_sync_sg_for_cpu(struct device *hwdev, struct scatterlist *sg,
96 int nelems, enum dma_data_direction dir);
97
98 extern void
99 swiotlb_sync_single_for_device(struct device *hwdev, dma_addr_t dev_addr,
100 size_t size, enum dma_data_direction dir);
101
102 extern void
103 swiotlb_sync_sg_for_device(struct device *hwdev, struct scatterlist *sg,
104 int nelems, enum dma_data_direction dir);
105
106 extern int
107 swiotlb_dma_mapping_error(struct device *hwdev, dma_addr_t dma_addr);
108
109 extern int
110 swiotlb_dma_supported(struct device *hwdev, u64 mask);
111
112 #ifdef CONFIG_SWIOTLB
113 extern void __init swiotlb_free(void);
114 #else
swiotlb_free(void)115 static inline void swiotlb_free(void) { }
116 #endif
117
118 extern void swiotlb_print_info(void);
119 extern int is_swiotlb_buffer(phys_addr_t paddr);
120
121 #endif /* __LINUX_SWIOTLB_H */
122