linux/include/linux/swiotlb.h
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   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);
 119#endif /* __LINUX_SWIOTLB_H */
 120
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