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swiotlb.h
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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 extern void swiotlb_init_with_tbl(char *tlb, unsigned long nslabs, int verbose);
27 extern unsigned long swiotlb_nr_tbl(void);
28 extern int swiotlb_late_init_with_tbl(char *tlb, unsigned long nslabs);
29 
30 /*
31  * Enumeration for sync targets
32  */
33 enum dma_sync_target {
34  SYNC_FOR_CPU = 0,
35  SYNC_FOR_DEVICE = 1,
36 };
37 extern void *swiotlb_tbl_map_single(struct device *hwdev, dma_addr_t tbl_dma_addr,
38  phys_addr_t phys, size_t size,
39  enum dma_data_direction dir);
40 
41 extern void swiotlb_tbl_unmap_single(struct device *hwdev, char *dma_addr,
42  size_t size, enum dma_data_direction dir);
43 
44 extern void swiotlb_tbl_sync_single(struct device *hwdev, char *dma_addr,
45  size_t size, enum dma_data_direction dir,
46  enum dma_sync_target target);
47 
48 /* Accessory functions. */
49 extern void swiotlb_bounce(phys_addr_t phys, char *dma_addr, size_t size,
50  enum dma_data_direction dir);
51 
52 extern void
53 *swiotlb_alloc_coherent(struct device *hwdev, size_t size,
54  dma_addr_t *dma_handle, gfp_t flags);
55 
56 extern void
57 swiotlb_free_coherent(struct device *hwdev, size_t size,
58  void *vaddr, dma_addr_t dma_handle);
59 
60 extern dma_addr_t swiotlb_map_page(struct device *dev, struct page *page,
61  unsigned long offset, size_t size,
62  enum dma_data_direction dir,
63  struct dma_attrs *attrs);
64 extern void swiotlb_unmap_page(struct device *hwdev, dma_addr_t dev_addr,
65  size_t size, enum dma_data_direction dir,
66  struct dma_attrs *attrs);
67 
68 extern int
69 swiotlb_map_sg(struct device *hwdev, struct scatterlist *sg, int nents,
70  enum dma_data_direction dir);
71 
72 extern void
73 swiotlb_unmap_sg(struct device *hwdev, struct scatterlist *sg, int nents,
74  enum dma_data_direction dir);
75 
76 extern int
77 swiotlb_map_sg_attrs(struct device *hwdev, struct scatterlist *sgl, int nelems,
78  enum dma_data_direction dir, struct dma_attrs *attrs);
79 
80 extern void
81 swiotlb_unmap_sg_attrs(struct device *hwdev, struct scatterlist *sgl,
82  int nelems, enum dma_data_direction dir,
83  struct dma_attrs *attrs);
84 
85 extern void
86 swiotlb_sync_single_for_cpu(struct device *hwdev, dma_addr_t dev_addr,
87  size_t size, enum dma_data_direction dir);
88 
89 extern void
90 swiotlb_sync_sg_for_cpu(struct device *hwdev, struct scatterlist *sg,
91  int nelems, enum dma_data_direction dir);
92 
93 extern void
94 swiotlb_sync_single_for_device(struct device *hwdev, dma_addr_t dev_addr,
95  size_t size, enum dma_data_direction dir);
96 
97 extern void
98 swiotlb_sync_sg_for_device(struct device *hwdev, struct scatterlist *sg,
99  int nelems, enum dma_data_direction dir);
100 
101 extern int
102 swiotlb_dma_mapping_error(struct device *hwdev, dma_addr_t dma_addr);
103 
104 extern int
105 swiotlb_dma_supported(struct device *hwdev, u64 mask);
106 
107 #ifdef CONFIG_SWIOTLB
108 extern void __init swiotlb_free(void);
109 #else
110 static inline void swiotlb_free(void) { }
111 #endif
112 
113 extern void swiotlb_print_info(void);
114 #endif /* __LINUX_SWIOTLB_H */
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