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);
  28extern int swiotlb_late_init_with_tbl(char *tlb, unsigned long nslabs);
  29
  30/*
  31 * Enumeration for sync targets
  32 */
  33enum dma_sync_target {
  34        SYNC_FOR_CPU = 0,
  35        SYNC_FOR_DEVICE = 1,
  36};
  37extern void *swiotlb_tbl_map_single(struct device *hwdev, dma_addr_t tbl_dma_addr,
  38                                    phys_addr_t phys, size_t size,
  39                                    enum dma_data_direction dir);
  40
  41extern void swiotlb_tbl_unmap_single(struct device *hwdev, char *dma_addr,
  42                                     size_t size, enum dma_data_direction dir);
  43
  44extern void swiotlb_tbl_sync_single(struct device *hwdev, char *dma_addr,
  45                                    size_t size, enum dma_data_direction dir,
  46                                    enum dma_sync_target target);
  47
  48/* Accessory functions. */
  49extern void swiotlb_bounce(phys_addr_t phys, char *dma_addr, size_t size,
  50                           enum dma_data_direction dir);
  51
  52extern void
  53*swiotlb_alloc_coherent(struct device *hwdev, size_t size,
  54                        dma_addr_t *dma_handle, gfp_t flags);
  55
  56extern void
  57swiotlb_free_coherent(struct device *hwdev, size_t size,
  58                      void *vaddr, dma_addr_t dma_handle);
  59
  60extern dma_addr_t swiotlb_map_page(struct device *dev, struct page *page,
  61                                   unsigned long offset, size_t size,
  62                                   enum dma_data_direction dir,
  63                                   struct dma_attrs *attrs);
  64extern void swiotlb_unmap_page(struct device *hwdev, dma_addr_t dev_addr,
  65                               size_t size, enum dma_data_direction dir,
  66                               struct dma_attrs *attrs);
  67
  68extern int
  69swiotlb_map_sg(struct device *hwdev, struct scatterlist *sg, int nents,
  70               enum dma_data_direction dir);
  71
  72extern void
  73swiotlb_unmap_sg(struct device *hwdev, struct scatterlist *sg, int nents,
  74                 enum dma_data_direction dir);
  75
  76extern int
  77swiotlb_map_sg_attrs(struct device *hwdev, struct scatterlist *sgl, int nelems,
  78                     enum dma_data_direction dir, struct dma_attrs *attrs);
  79
  80extern void
  81swiotlb_unmap_sg_attrs(struct device *hwdev, struct scatterlist *sgl,
  82                       int nelems, enum dma_data_direction dir,
  83                       struct dma_attrs *attrs);
  84
  85extern void
  86swiotlb_sync_single_for_cpu(struct device *hwdev, dma_addr_t dev_addr,
  87                            size_t size, enum dma_data_direction dir);
  88
  89extern void
  90swiotlb_sync_sg_for_cpu(struct device *hwdev, struct scatterlist *sg,
  91                        int nelems, enum dma_data_direction dir);
  92
  93extern void
  94swiotlb_sync_single_for_device(struct device *hwdev, dma_addr_t dev_addr,
  95                               size_t size, enum dma_data_direction dir);
  96
  97extern void
  98swiotlb_sync_sg_for_device(struct device *hwdev, struct scatterlist *sg,
  99                           int nelems, enum dma_data_direction dir);
 100
 101extern int
 102swiotlb_dma_mapping_error(struct device *hwdev, dma_addr_t dma_addr);
 103
 104extern int
 105swiotlb_dma_supported(struct device *hwdev, u64 mask);
 106
 107#ifdef CONFIG_SWIOTLB
 108extern void __init swiotlb_free(void);
 109#else
 110static inline void swiotlb_free(void) { }
 111#endif
 112
 113extern void swiotlb_print_info(void);
 114#endif /* __LINUX_SWIOTLB_H */
 115
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