include/linux/swiotlb.h

   1 #ifndef __LINUX_SWIOTLB_H
   2 #define __LINUX_SWIOTLB_H
   3
   4 #include <linux/types.h>
   5
   6 struct device;
   7 struct dma_attrs;
   8 struct scatterlist;
   9
  10 extern 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
  25 extern void swiotlb_init(int verbose);
  26 int swiotlb_init_with_tbl(char *tlb, unsigned long nslabs, int verbose);
  27 extern unsigned long swiotlb_nr_tbl(void);
  28 extern int swiotlb_late_init_with_tbl(char *tlb, unsigned long nslabs);
  29
  30 /*
  31  * Enumeration for sync targets
  32  */
  33 enum dma_sync_target {
  34         SYNC_FOR_CPU = 0,
  35         SYNC_FOR_DEVICE = 1,
  36 };
  37
  38 /* define the last possible byte of physical address space as a mapping error */
  39 #define SWIOTLB_MAP_ERROR (~(phys_addr_t)0x0)
  40
  41 extern phys_addr_t swiotlb_tbl_map_single(struct device *hwdev,
  42                                           dma_addr_t tbl_dma_addr,
  43                                           phys_addr_t phys, size_t size,
  44                                           enum dma_data_direction dir);
  45
  46 extern void swiotlb_tbl_unmap_single(struct device *hwdev,
  47                                      phys_addr_t tlb_addr,
  48                                      size_t size, enum dma_data_direction dir);
  49
  50 extern void swiotlb_tbl_sync_single(struct device *hwdev,
  51                                     phys_addr_t tlb_addr,
  52                                     size_t size, enum dma_data_direction dir,
  53                                     enum dma_sync_target target);
  54
  55 /* Accessory functions. */
  56 extern void
  57 *swiotlb_alloc_coherent(struct device *hwdev, size_t size,
  58                         dma_addr_t *dma_handle, gfp_t flags);
  59
  60 extern void
  61 swiotlb_free_coherent(struct device *hwdev, size_t size,
  62                       void *vaddr, dma_addr_t dma_handle);
  63
  64 extern dma_addr_t swiotlb_map_page(struct device *dev, struct page *page,
  65                                    unsigned long offset, size_t size,
  66                                    enum dma_data_direction dir,
  67                                    struct dma_attrs *attrs);
  68 extern void swiotlb_unmap_page(struct device *hwdev, dma_addr_t dev_addr,
  69                                size_t size, enum dma_data_direction dir,
  70                                struct dma_attrs *attrs);
  71
  72 extern int
  73 swiotlb_map_sg(struct device *hwdev, struct scatterlist *sg, int nents,
  74                enum dma_data_direction dir);
  75
  76 extern void
  77 swiotlb_unmap_sg(struct device *hwdev, struct scatterlist *sg, int nents,
  78                  enum dma_data_direction dir);
  79
  80 extern int
  81 swiotlb_map_sg_attrs(struct device *hwdev, struct scatterlist *sgl, int nelems,
  82                      enum dma_data_direction dir, struct dma_attrs *attrs);
  83
  84 extern void
  85 swiotlb_unmap_sg_attrs(struct device *hwdev, struct scatterlist *sgl,
  86                        int nelems, enum dma_data_direction dir,
  87                        struct dma_attrs *attrs);
  88
  89 extern void
  90 swiotlb_sync_single_for_cpu(struct device *hwdev, dma_addr_t dev_addr,
  91                             size_t size, enum dma_data_direction dir);
  92
  93 extern void
  94 swiotlb_sync_sg_for_cpu(struct device *hwdev, struct scatterlist *sg,
  95                         int nelems, enum dma_data_direction dir);
  96
  97 extern void
  98 swiotlb_sync_single_for_device(struct device *hwdev, dma_addr_t dev_addr,
  99                                size_t size, enum dma_data_direction dir);
 100
 101 extern void
 102 swiotlb_sync_sg_for_device(struct device *hwdev, struct scatterlist *sg,
 103                            int nelems, enum dma_data_direction dir);
 104
 105 extern int
 106 swiotlb_dma_mapping_error(struct device *hwdev, dma_addr_t dma_addr);
 107
 108 extern int
 109 swiotlb_dma_supported(struct device *hwdev, u64 mask);
 110
 111 #ifdef CONFIG_SWIOTLB
 112 extern void __init swiotlb_free(void);
 113 #else
 114 static inline void swiotlb_free(void) { }
 115 #endif
 116
 117 extern void swiotlb_print_info(void);
 118 #endif /* __LINUX_SWIOTLB_H */