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git.proxmox.com Git - mirror_ubuntu-zesty-kernel.git/blob - include/linux/swiotlb.h
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>
12 extern int swiotlb_force
;
15 * Maximum allowable number of contiguous slabs to map,
16 * must be a power of 2. What is the appropriate value ?
17 * The complexity of {map,unmap}_single is linearly dependent on this value.
19 #define IO_TLB_SEGSIZE 128
22 * log of the size of each IO TLB slab. The number of slabs is command line
25 #define IO_TLB_SHIFT 11
27 extern void swiotlb_init(int verbose
);
28 int swiotlb_init_with_tbl(char *tlb
, unsigned long nslabs
, int verbose
);
29 extern unsigned long swiotlb_nr_tbl(void);
30 unsigned long swiotlb_size_or_default(void);
31 extern int swiotlb_late_init_with_tbl(char *tlb
, unsigned long nslabs
);
34 * Enumeration for sync targets
36 enum dma_sync_target
{
41 /* define the last possible byte of physical address space as a mapping error */
42 #define SWIOTLB_MAP_ERROR (~(phys_addr_t)0x0)
44 extern phys_addr_t
swiotlb_tbl_map_single(struct device
*hwdev
,
45 dma_addr_t tbl_dma_addr
,
46 phys_addr_t phys
, size_t size
,
47 enum dma_data_direction dir
);
49 extern void swiotlb_tbl_unmap_single(struct device
*hwdev
,
51 size_t size
, enum dma_data_direction dir
);
53 extern void swiotlb_tbl_sync_single(struct device
*hwdev
,
55 size_t size
, enum dma_data_direction dir
,
56 enum dma_sync_target target
);
58 /* Accessory functions. */
60 *swiotlb_alloc_coherent(struct device
*hwdev
, size_t size
,
61 dma_addr_t
*dma_handle
, gfp_t flags
);
64 swiotlb_free_coherent(struct device
*hwdev
, size_t size
,
65 void *vaddr
, dma_addr_t dma_handle
);
67 extern dma_addr_t
swiotlb_map_page(struct device
*dev
, struct page
*page
,
68 unsigned long offset
, size_t size
,
69 enum dma_data_direction dir
,
71 extern void swiotlb_unmap_page(struct device
*hwdev
, dma_addr_t dev_addr
,
72 size_t size
, enum dma_data_direction dir
,
76 swiotlb_map_sg(struct device
*hwdev
, struct scatterlist
*sg
, int nents
,
77 enum dma_data_direction dir
);
80 swiotlb_unmap_sg(struct device
*hwdev
, struct scatterlist
*sg
, int nents
,
81 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);
118 static inline void swiotlb_free(void) { }
121 extern void swiotlb_print_info(void);
122 extern int is_swiotlb_buffer(phys_addr_t paddr
);
124 #endif /* __LINUX_SWIOTLB_H */