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 unsigned long swiotlb_size_or_default(void);
29 extern int swiotlb_late_init_with_tbl(char *tlb
, unsigned long nslabs
);
32 * Enumeration for sync targets
34 enum dma_sync_target
{
39 /* define the last possible byte of physical address space as a mapping error */
40 #define SWIOTLB_MAP_ERROR (~(phys_addr_t)0x0)
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
);
47 extern void swiotlb_tbl_unmap_single(struct device
*hwdev
,
49 size_t size
, enum dma_data_direction dir
);
51 extern void swiotlb_tbl_sync_single(struct device
*hwdev
,
53 size_t size
, enum dma_data_direction dir
,
54 enum dma_sync_target target
);
56 /* Accessory functions. */
58 *swiotlb_alloc_coherent(struct device
*hwdev
, size_t size
,
59 dma_addr_t
*dma_handle
, gfp_t flags
);
62 swiotlb_free_coherent(struct device
*hwdev
, size_t size
,
63 void *vaddr
, dma_addr_t dma_handle
);
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
);
74 swiotlb_map_sg(struct device
*hwdev
, struct scatterlist
*sg
, int nents
,
75 enum dma_data_direction dir
);
78 swiotlb_unmap_sg(struct device
*hwdev
, struct scatterlist
*sg
, int nents
,
79 enum dma_data_direction dir
);
82 swiotlb_map_sg_attrs(struct device
*hwdev
, struct scatterlist
*sgl
, int nelems
,
83 enum dma_data_direction dir
, struct dma_attrs
*attrs
);
86 swiotlb_unmap_sg_attrs(struct device
*hwdev
, struct scatterlist
*sgl
,
87 int nelems
, enum dma_data_direction dir
,
88 struct dma_attrs
*attrs
);
91 swiotlb_sync_single_for_cpu(struct device
*hwdev
, dma_addr_t dev_addr
,
92 size_t size
, enum dma_data_direction dir
);
95 swiotlb_sync_sg_for_cpu(struct device
*hwdev
, struct scatterlist
*sg
,
96 int nelems
, enum dma_data_direction dir
);
99 swiotlb_sync_single_for_device(struct device
*hwdev
, dma_addr_t dev_addr
,
100 size_t size
, enum dma_data_direction dir
);
103 swiotlb_sync_sg_for_device(struct device
*hwdev
, struct scatterlist
*sg
,
104 int nelems
, enum dma_data_direction dir
);
107 swiotlb_dma_mapping_error(struct device
*hwdev
, dma_addr_t dma_addr
);
110 swiotlb_dma_supported(struct device
*hwdev
, u64 mask
);
112 #ifdef CONFIG_SWIOTLB
113 extern void __init
swiotlb_free(void);
115 static inline void swiotlb_free(void) { }
118 extern void swiotlb_print_info(void);
119 extern int is_swiotlb_buffer(phys_addr_t paddr
);
121 #endif /* __LINUX_SWIOTLB_H */