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);
  26extern void swiotlb_init_with_tbl(char *tlb, unsigned long nslabs, int verbose);
  27extern unsigned long swiotlb_nr_tbl(void);
  28
  29/*
  30 * Enumeration for sync targets
  31 */
  32enum dma_sync_target {
  33        SYNC_FOR_CPU = 0,
  34        SYNC_FOR_DEVICE = 1,
  35};
  36extern void *swiotlb_tbl_map_single(struct device *hwdev, dma_addr_t tbl_dma_addr,
  37                                    phys_addr_t phys, size_t size,
  38                                    enum dma_data_direction dir);
  39
  40extern void swiotlb_tbl_unmap_single(struct device *hwdev, char *dma_addr,
  41                                     size_t size, enum dma_data_direction dir);
  42
  43extern void swiotlb_tbl_sync_single(struct device *hwdev, char *dma_addr,
  44                                    size_t size, enum dma_data_direction dir,
  45                                    enum dma_sync_target target);
  46
  47/* Accessory functions. */
  48extern void swiotlb_bounce(phys_addr_t phys, char *dma_addr, size_t size,
  49                           enum dma_data_direction dir);
  50
  51extern void
  52*swiotlb_alloc_coherent(struct device *hwdev, size_t size,
  53                        dma_addr_t *dma_handle, gfp_t flags);
  54
  55extern void
  56swiotlb_free_coherent(struct device *hwdev, size_t size,
  57                      void *vaddr, dma_addr_t dma_handle);
  58
  59extern dma_addr_t swiotlb_map_page(struct device *dev, struct page *page,
  60                                   unsigned long offset, size_t size,
  61                                   enum dma_data_direction dir,
  62                                   struct dma_attrs *attrs);
  63extern void swiotlb_unmap_page(struct device *hwdev, dma_addr_t dev_addr,
  64                               size_t size, enum dma_data_direction dir,
  65                               struct dma_attrs *attrs);
  66
  67extern int
  68swiotlb_map_sg(struct device *hwdev, struct scatterlist *sg, int nents,
  69               enum dma_data_direction dir);
  70
  71extern void
  72swiotlb_unmap_sg(struct device *hwdev, struct scatterlist *sg, int nents,
  73                 enum dma_data_direction dir);
  74
  75extern int
  76swiotlb_map_sg_attrs(struct device *hwdev, struct scatterlist *sgl, int nelems,
  77                     enum dma_data_direction dir, struct dma_attrs *attrs);
  78
  79extern void
  80swiotlb_unmap_sg_attrs(struct device *hwdev, struct scatterlist *sgl,
  81                       int nelems, enum dma_data_direction dir,
  82                       struct dma_attrs *attrs);
  83
  84extern void
  85swiotlb_sync_single_for_cpu(struct device *hwdev, dma_addr_t dev_addr,
  86                            size_t size, enum dma_data_direction dir);
  87
  88extern void
  89swiotlb_sync_sg_for_cpu(struct device *hwdev, struct scatterlist *sg,
  90                        int nelems, enum dma_data_direction dir);
  91
  92extern void
  93swiotlb_sync_single_for_device(struct device *hwdev, dma_addr_t dev_addr,
  94                               size_t size, enum dma_data_direction dir);
  95
  96extern void
  97swiotlb_sync_sg_for_device(struct device *hwdev, struct scatterlist *sg,
  98                           int nelems, enum dma_data_direction dir);
  99
 100extern int
 101swiotlb_dma_mapping_error(struct device *hwdev, dma_addr_t dma_addr);
 102
 103extern int
 104swiotlb_dma_supported(struct device *hwdev, u64 mask);
 105
 106#ifdef CONFIG_SWIOTLB
 107extern void __init swiotlb_free(void);
 108#else
 109static inline void swiotlb_free(void) { }
 110#endif
 111
 112extern void swiotlb_print_info(void);
 113#endif /* __LINUX_SWIOTLB_H */
 114
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