1 #ifndef __LINUX_SWIOTLB_H
2 #define __LINUX_SWIOTLB_H
4 #include <linux/dma-direction.h>
5 #include <linux/init.h>
6 #include <linux/types.h>
13 SWIOTLB_NORMAL
, /* Default - depending on HW DMA mask etc. */
14 SWIOTLB_FORCE
, /* swiotlb=force */
15 SWIOTLB_NO_FORCE
, /* swiotlb=noforce */
18 extern enum swiotlb_force swiotlb_force
;
21 * Maximum allowable number of contiguous slabs to map,
22 * must be a power of 2. What is the appropriate value ?
23 * The complexity of {map,unmap}_single is linearly dependent on this value.
25 #define IO_TLB_SEGSIZE 128
28 * log of the size of each IO TLB slab. The number of slabs is command line
31 #define IO_TLB_SHIFT 11
33 extern void swiotlb_init(int verbose
);
34 int swiotlb_init_with_tbl(char *tlb
, unsigned long nslabs
, int verbose
);
35 extern unsigned long swiotlb_nr_tbl(void);
36 unsigned long swiotlb_size_or_default(void);
37 extern int swiotlb_late_init_with_tbl(char *tlb
, unsigned long nslabs
);
40 * Enumeration for sync targets
42 enum dma_sync_target
{
47 /* define the last possible byte of physical address space as a mapping error */
48 #define SWIOTLB_MAP_ERROR (~(phys_addr_t)0x0)
50 extern phys_addr_t
swiotlb_tbl_map_single(struct device
*hwdev
,
51 dma_addr_t tbl_dma_addr
,
52 phys_addr_t phys
, size_t size
,
53 enum dma_data_direction dir
,
56 extern void swiotlb_tbl_unmap_single(struct device
*hwdev
,
58 size_t size
, enum dma_data_direction dir
,
61 extern void swiotlb_tbl_sync_single(struct device
*hwdev
,
63 size_t size
, enum dma_data_direction dir
,
64 enum dma_sync_target target
);
66 /* Accessory functions. */
68 *swiotlb_alloc_coherent(struct device
*hwdev
, size_t size
,
69 dma_addr_t
*dma_handle
, gfp_t flags
);
72 swiotlb_free_coherent(struct device
*hwdev
, size_t size
,
73 void *vaddr
, dma_addr_t dma_handle
);
75 extern dma_addr_t
swiotlb_map_page(struct device
*dev
, struct page
*page
,
76 unsigned long offset
, size_t size
,
77 enum dma_data_direction dir
,
79 extern void swiotlb_unmap_page(struct device
*hwdev
, dma_addr_t dev_addr
,
80 size_t size
, enum dma_data_direction dir
,
84 swiotlb_map_sg_attrs(struct device
*hwdev
, struct scatterlist
*sgl
, int nelems
,
85 enum dma_data_direction dir
,
89 swiotlb_unmap_sg_attrs(struct device
*hwdev
, struct scatterlist
*sgl
,
90 int nelems
, enum dma_data_direction dir
,
94 swiotlb_sync_single_for_cpu(struct device
*hwdev
, dma_addr_t dev_addr
,
95 size_t size
, enum dma_data_direction dir
);
98 swiotlb_sync_sg_for_cpu(struct device
*hwdev
, struct scatterlist
*sg
,
99 int nelems
, enum dma_data_direction dir
);
102 swiotlb_sync_single_for_device(struct device
*hwdev
, dma_addr_t dev_addr
,
103 size_t size
, enum dma_data_direction dir
);
106 swiotlb_sync_sg_for_device(struct device
*hwdev
, struct scatterlist
*sg
,
107 int nelems
, enum dma_data_direction dir
);
110 swiotlb_dma_mapping_error(struct device
*hwdev
, dma_addr_t dma_addr
);
113 swiotlb_dma_supported(struct device
*hwdev
, u64 mask
);
115 #ifdef CONFIG_SWIOTLB
116 extern void __init
swiotlb_free(void);
117 unsigned int swiotlb_max_segment(void);
119 static inline void swiotlb_free(void) { }
120 static inline unsigned int swiotlb_max_segment(void) { return 0; }
123 extern void swiotlb_print_info(void);
124 extern int is_swiotlb_buffer(phys_addr_t paddr
);
125 extern void swiotlb_set_max_segment(unsigned int);
127 #endif /* __LINUX_SWIOTLB_H */