1 #ifndef __LINUX_SWIOTLB_H
2 #define __LINUX_SWIOTLB_H
4 #include <linux/types.h>
10 extern int swiotlb_force
;
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.
17 #define IO_TLB_SEGSIZE 128
20 * log of the size of each IO TLB slab. The number of slabs is command line
23 #define IO_TLB_SHIFT 11
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 extern int swiotlb_late_init_with_tbl(char *tlb
, unsigned long nslabs
);
31 * Enumeration for sync targets
33 enum dma_sync_target
{
38 /* define the last possible byte of physical address space as a mapping error */
39 #define SWIOTLB_MAP_ERROR (~(phys_addr_t)0x0)
41 extern phys_addr_t
swiotlb_tbl_map_single(struct device
*hwdev
,
42 dma_addr_t tbl_dma_addr
,
43 phys_addr_t phys
, size_t size
,
44 enum dma_data_direction dir
);
46 extern void swiotlb_tbl_unmap_single(struct device
*hwdev
,
48 size_t size
, enum dma_data_direction dir
);
50 extern void swiotlb_tbl_sync_single(struct device
*hwdev
,
52 size_t size
, enum dma_data_direction dir
,
53 enum dma_sync_target target
);
55 /* Accessory functions. */
57 *swiotlb_alloc_coherent(struct device
*hwdev
, size_t size
,
58 dma_addr_t
*dma_handle
, gfp_t flags
);
61 swiotlb_free_coherent(struct device
*hwdev
, size_t size
,
62 void *vaddr
, dma_addr_t dma_handle
);
64 extern dma_addr_t
swiotlb_map_page(struct device
*dev
, struct page
*page
,
65 unsigned long offset
, size_t size
,
66 enum dma_data_direction dir
,
67 struct dma_attrs
*attrs
);
68 extern void swiotlb_unmap_page(struct device
*hwdev
, dma_addr_t dev_addr
,
69 size_t size
, enum dma_data_direction dir
,
70 struct dma_attrs
*attrs
);
73 swiotlb_map_sg(struct device
*hwdev
, struct scatterlist
*sg
, int nents
,
74 enum dma_data_direction dir
);
77 swiotlb_unmap_sg(struct device
*hwdev
, struct scatterlist
*sg
, int nents
,
78 enum dma_data_direction dir
);
81 swiotlb_map_sg_attrs(struct device
*hwdev
, struct scatterlist
*sgl
, int nelems
,
82 enum dma_data_direction dir
, struct dma_attrs
*attrs
);
85 swiotlb_unmap_sg_attrs(struct device
*hwdev
, struct scatterlist
*sgl
,
86 int nelems
, enum dma_data_direction dir
,
87 struct dma_attrs
*attrs
);
90 swiotlb_sync_single_for_cpu(struct device
*hwdev
, dma_addr_t dev_addr
,
91 size_t size
, enum dma_data_direction dir
);
94 swiotlb_sync_sg_for_cpu(struct device
*hwdev
, struct scatterlist
*sg
,
95 int nelems
, enum dma_data_direction dir
);
98 swiotlb_sync_single_for_device(struct device
*hwdev
, dma_addr_t dev_addr
,
99 size_t size
, enum dma_data_direction dir
);
102 swiotlb_sync_sg_for_device(struct device
*hwdev
, struct scatterlist
*sg
,
103 int nelems
, enum dma_data_direction dir
);
106 swiotlb_dma_mapping_error(struct device
*hwdev
, dma_addr_t dma_addr
);
109 swiotlb_dma_supported(struct device
*hwdev
, u64 mask
);
111 #ifdef CONFIG_SWIOTLB
112 extern void __init
swiotlb_free(void);
114 static inline void swiotlb_free(void) { }
117 extern void swiotlb_print_info(void);
118 #endif /* __LINUX_SWIOTLB_H */
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