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 dma_attrs;
  10struct page;
  11struct scatterlist;
  12
  13extern int swiotlb_force;
  14
  15/*
  16 * Maximum allowable number of contiguous slabs to map,
  17 * must be a power of 2.  What is the appropriate value ?
  18 * The complexity of {map,unmap}_single is linearly dependent on this value.
  19 */
  20#define IO_TLB_SEGSIZE  128
  21
  22/*
  23 * log of the size of each IO TLB slab.  The number of slabs is command line
  24 * controllable.
  25 */
  26#define IO_TLB_SHIFT 11
  27
  28extern void swiotlb_init(int verbose);
  29int swiotlb_init_with_tbl(char *tlb, unsigned long nslabs, int verbose);
  30extern unsigned long swiotlb_nr_tbl(void);
  31unsigned long swiotlb_size_or_default(void);
  32extern int swiotlb_late_init_with_tbl(char *tlb, unsigned long nslabs);
  33
  34/*
  35 * Enumeration for sync targets
  36 */
  37enum dma_sync_target {
  38        SYNC_FOR_CPU = 0,
  39        SYNC_FOR_DEVICE = 1,
  40};
  41
  42/* define the last possible byte of physical address space as a mapping error */
  43#define SWIOTLB_MAP_ERROR (~(phys_addr_t)0x0)
  44
  45extern phys_addr_t swiotlb_tbl_map_single(struct device *hwdev,
  46                                          dma_addr_t tbl_dma_addr,
  47                                          phys_addr_t phys, size_t size,
  48                                          enum dma_data_direction dir);
  49
  50extern void swiotlb_tbl_unmap_single(struct device *hwdev,
  51                                     phys_addr_t tlb_addr,
  52                                     size_t size, enum dma_data_direction dir);
  53
  54extern void swiotlb_tbl_sync_single(struct device *hwdev,
  55                                    phys_addr_t tlb_addr,
  56                                    size_t size, enum dma_data_direction dir,
  57                                    enum dma_sync_target target);
  58
  59/* Accessory functions. */
  60extern void
  61*swiotlb_alloc_coherent(struct device *hwdev, size_t size,
  62                        dma_addr_t *dma_handle, gfp_t flags);
  63
  64extern void
  65swiotlb_free_coherent(struct device *hwdev, size_t size,
  66                      void *vaddr, dma_addr_t dma_handle);
  67
  68extern dma_addr_t swiotlb_map_page(struct device *dev, struct page *page,
  69                                   unsigned long offset, size_t size,
  70                                   enum dma_data_direction dir,
  71                                   struct dma_attrs *attrs);
  72extern void swiotlb_unmap_page(struct device *hwdev, dma_addr_t dev_addr,
  73                               size_t size, enum dma_data_direction dir,
  74                               struct dma_attrs *attrs);
  75
  76extern int
  77swiotlb_map_sg(struct device *hwdev, struct scatterlist *sg, int nents,
  78               enum dma_data_direction dir);
  79
  80extern void
  81swiotlb_unmap_sg(struct device *hwdev, struct scatterlist *sg, int nents,
  82                 enum dma_data_direction dir);
  83
  84extern int
  85swiotlb_map_sg_attrs(struct device *hwdev, struct scatterlist *sgl, int nelems,
  86                     enum dma_data_direction dir, struct dma_attrs *attrs);
  87
  88extern void
  89swiotlb_unmap_sg_attrs(struct device *hwdev, struct scatterlist *sgl,
  90                       int nelems, enum dma_data_direction dir,
  91                       struct dma_attrs *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