LXR linux/include/linux/swiotlb.h

   1#ifndef __LINUX_SWIOTLB_H
   2#define __LINUX_SWIOTLB_H
   3
   4#include <linux/dma-direction.h>
   5#include <linux/init.h>
   6#include <linux/types.h>
   7
   8struct device;
   9struct page;
  10struct scatterlist;
  11
  12extern int swiotlb_force;
  13
  14/*
  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.
  18 */
  19#define IO_TLB_SEGSIZE  128
  20
  21/*
  22 * log of the size of each IO TLB slab.  The number of slabs is command line
  23 * controllable.
  24 */
  25#define IO_TLB_SHIFT 11
  26
  27extern void swiotlb_init(int verbose);
  28int swiotlb_init_with_tbl(char *tlb, unsigned long nslabs, int verbose);
  29extern unsigned long swiotlb_nr_tbl(void);
  30unsigned long swiotlb_size_or_default(void);
  31extern int swiotlb_late_init_with_tbl(char *tlb, unsigned long nslabs);
  32
  33/*
  34 * Enumeration for sync targets
  35 */
  36enum dma_sync_target {
  37        SYNC_FOR_CPU = 0,
  38        SYNC_FOR_DEVICE = 1,
  39};
  40
  41/* define the last possible byte of physical address space as a mapping error */
  42#define SWIOTLB_MAP_ERROR (~(phys_addr_t)0x0)
  43
  44extern 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);
  48
  49extern void swiotlb_tbl_unmap_single(struct device *hwdev,
  50                                     phys_addr_t tlb_addr,
  51                                     size_t size, enum dma_data_direction dir);
  52
  53extern void swiotlb_tbl_sync_single(struct device *hwdev,
  54                                    phys_addr_t tlb_addr,
  55                                    size_t size, enum dma_data_direction dir,
  56                                    enum dma_sync_target target);
  57
  58/* Accessory functions. */
  59extern void
  60*swiotlb_alloc_coherent(struct device *hwdev, size_t size,
  61                        dma_addr_t *dma_handle, gfp_t flags);
  62
  63extern void
  64swiotlb_free_coherent(struct device *hwdev, size_t size,
  65                      void *vaddr, dma_addr_t dma_handle);
  66
  67extern 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,
  70                                   unsigned long attrs);
  71extern void swiotlb_unmap_page(struct device *hwdev, dma_addr_t dev_addr,
  72                               size_t size, enum dma_data_direction dir,
  73                               unsigned long attrs);
  74
  75extern int
  76swiotlb_map_sg(struct device *hwdev, struct scatterlist *sg, int nents,
  77               enum dma_data_direction dir);
  78
  79extern void
  80swiotlb_unmap_sg(struct device *hwdev, struct scatterlist *sg, int nents,
  81                 enum dma_data_direction dir);
  82
  83extern int
  84swiotlb_map_sg_attrs(struct device *hwdev, struct scatterlist *sgl, int nelems,
  85                     enum dma_data_direction dir,
  86                     unsigned long attrs);
  87
  88extern void
  89swiotlb_unmap_sg_attrs(struct device *hwdev, struct scatterlist *sgl,
  90                       int nelems, enum dma_data_direction dir,
  91                       unsigned long attrs);
  92
  93extern void
  94swiotlb_sync_single_for_cpu(struct device *hwdev, dma_addr_t dev_addr,
  95                            size_t size, enum dma_data_direction dir);
  96
  97extern void
  98swiotlb_sync_sg_for_cpu(struct device *hwdev, struct scatterlist *sg,
  99                        int nelems, enum dma_data_direction dir);
 100
 101extern void
 102swiotlb_sync_single_for_device(struct device *hwdev, dma_addr_t dev_addr,
 103                               size_t size, enum dma_data_direction dir);
 104
 105extern void
 106swiotlb_sync_sg_for_device(struct device *hwdev, struct scatterlist *sg,
 107                           int nelems, enum dma_data_direction dir);
 108
 109extern int
 110swiotlb_dma_mapping_error(struct device *hwdev, dma_addr_t dma_addr);
 111
 112extern int
 113swiotlb_dma_supported(struct device *hwdev, u64 mask);
 114
 115#ifdef CONFIG_SWIOTLB
 116extern void __init swiotlb_free(void);
 117#else
 118static inline void swiotlb_free(void) { }
 119#endif
 120
 121extern void swiotlb_print_info(void);
 122extern int is_swiotlb_buffer(phys_addr_t paddr);
 123
 124#endif /* __LINUX_SWIOTLB_H */
 125