LXR linux/include/linux/swiotlb.h

   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);
  26
  27extern void
  28*swiotlb_alloc_coherent(struct device *hwdev, size_t size,
  29                        dma_addr_t *dma_handle, gfp_t flags);
  30
  31extern void
  32swiotlb_free_coherent(struct device *hwdev, size_t size,
  33                      void *vaddr, dma_addr_t dma_handle);
  34
  35extern dma_addr_t swiotlb_map_page(struct device *dev, struct page *page,
  36                                   unsigned long offset, size_t size,
  37                                   enum dma_data_direction dir,
  38                                   struct dma_attrs *attrs);
  39extern void swiotlb_unmap_page(struct device *hwdev, dma_addr_t dev_addr,
  40                               size_t size, enum dma_data_direction dir,
  41                               struct dma_attrs *attrs);
  42
  43extern int
  44swiotlb_map_sg(struct device *hwdev, struct scatterlist *sg, int nents,
  45               int direction);
  46
  47extern void
  48swiotlb_unmap_sg(struct device *hwdev, struct scatterlist *sg, int nents,
  49                 int direction);
  50
  51extern int
  52swiotlb_map_sg_attrs(struct device *hwdev, struct scatterlist *sgl, int nelems,
  53                     enum dma_data_direction dir, struct dma_attrs *attrs);
  54
  55extern void
  56swiotlb_unmap_sg_attrs(struct device *hwdev, struct scatterlist *sgl,
  57                       int nelems, enum dma_data_direction dir,
  58                       struct dma_attrs *attrs);
  59
  60extern void
  61swiotlb_sync_single_for_cpu(struct device *hwdev, dma_addr_t dev_addr,
  62                            size_t size, enum dma_data_direction dir);
  63
  64extern void
  65swiotlb_sync_sg_for_cpu(struct device *hwdev, struct scatterlist *sg,
  66                        int nelems, enum dma_data_direction dir);
  67
  68extern void
  69swiotlb_sync_single_for_device(struct device *hwdev, dma_addr_t dev_addr,
  70                               size_t size, enum dma_data_direction dir);
  71
  72extern void
  73swiotlb_sync_sg_for_device(struct device *hwdev, struct scatterlist *sg,
  74                           int nelems, enum dma_data_direction dir);
  75
  76extern void
  77swiotlb_sync_single_range_for_cpu(struct device *hwdev, dma_addr_t dev_addr,
  78                                  unsigned long offset, size_t size,
  79                                  enum dma_data_direction dir);
  80
  81extern void
  82swiotlb_sync_single_range_for_device(struct device *hwdev, dma_addr_t dev_addr,
  83                                     unsigned long offset, size_t size,
  84                                     enum dma_data_direction dir);
  85
  86extern int
  87swiotlb_dma_mapping_error(struct device *hwdev, dma_addr_t dma_addr);
  88
  89extern int
  90swiotlb_dma_supported(struct device *hwdev, u64 mask);
  91
  92#ifdef CONFIG_SWIOTLB
  93extern void __init swiotlb_free(void);
  94#else
  95static inline void swiotlb_free(void) { }
  96#endif
  97
  98extern void swiotlb_print_info(void);
  99#endif /* __LINUX_SWIOTLB_H */
 100