1#ifndef __LINUX_SWIOTLB_H
2#define __LINUX_SWIOTLB_H
3
4#include <linux/types.h>
5
6struct device;
7struct dma_attrs;
8struct scatterlist;
9
10extern 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
25extern void swiotlb_init(int verbose);
26int swiotlb_init_with_tbl(char *tlb, unsigned long nslabs, int verbose);
27extern unsigned long swiotlb_nr_tbl(void);
28unsigned long swiotlb_size_or_default(void);
29extern int swiotlb_late_init_with_tbl(char *tlb, unsigned long nslabs);
30
31/*
32 * Enumeration for sync targets
33 */
34enum 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
42extern 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
47extern void swiotlb_tbl_unmap_single(struct device *hwdev,
48				     phys_addr_t tlb_addr,
49				     size_t size, enum dma_data_direction dir);
50
51extern 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. */
57extern void
58*swiotlb_alloc_coherent(struct device *hwdev, size_t size,
59			dma_addr_t *dma_handle, gfp_t flags);
60
61extern void
62swiotlb_free_coherent(struct device *hwdev, size_t size,
63		      void *vaddr, dma_addr_t dma_handle);
64
65extern 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);
69extern 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
73extern int
74swiotlb_map_sg(struct device *hwdev, struct scatterlist *sg, int nents,
75	       enum dma_data_direction dir);
76
77extern void
78swiotlb_unmap_sg(struct device *hwdev, struct scatterlist *sg, int nents,
79		 enum dma_data_direction dir);
80
81extern int
82swiotlb_map_sg_attrs(struct device *hwdev, struct scatterlist *sgl, int nelems,
83		     enum dma_data_direction dir, struct dma_attrs *attrs);
84
85extern void
86swiotlb_unmap_sg_attrs(struct device *hwdev, struct scatterlist *sgl,
87		       int nelems, enum dma_data_direction dir,
88		       struct dma_attrs *attrs);
89
90extern void
91swiotlb_sync_single_for_cpu(struct device *hwdev, dma_addr_t dev_addr,
92			    size_t size, enum dma_data_direction dir);
93
94extern void
95swiotlb_sync_sg_for_cpu(struct device *hwdev, struct scatterlist *sg,
96			int nelems, enum dma_data_direction dir);
97
98extern void
99swiotlb_sync_single_for_device(struct device *hwdev, dma_addr_t dev_addr,
100			       size_t size, enum dma_data_direction dir);
101
102extern void
103swiotlb_sync_sg_for_device(struct device *hwdev, struct scatterlist *sg,
104			   int nelems, enum dma_data_direction dir);
105
106extern int
107swiotlb_dma_mapping_error(struct device *hwdev, dma_addr_t dma_addr);
108
109extern int
110swiotlb_dma_supported(struct device *hwdev, u64 mask);
111
112#ifdef CONFIG_SWIOTLB
113extern void __init swiotlb_free(void);
114#else
115static inline void swiotlb_free(void) { }
116#endif
117
118extern void swiotlb_print_info(void);
119extern int is_swiotlb_buffer(phys_addr_t paddr);
120
121#endif /* __LINUX_SWIOTLB_H */
122