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 extern void swiotlb_init_with_tbl(char *tlb, unsigned long nslabs, int verbose);
  27
  28 /*
  29  * Enumeration for sync targets
  30  */
  31 enum dma_sync_target {
  32         SYNC_FOR_CPU = 0,
  33         SYNC_FOR_DEVICE = 1,
  34 };
  35 extern void *swiotlb_tbl_map_single(struct device *hwdev, dma_addr_t tbl_dma_addr,
  36                                     phys_addr_t phys, size_t size,
  37                                     enum dma_data_direction dir);
  38
  39 extern void swiotlb_tbl_unmap_single(struct device *hwdev, char *dma_addr,
  40                                      size_t size, enum dma_data_direction dir);
  41
  42 extern void swiotlb_tbl_sync_single(struct device *hwdev, char *dma_addr,
  43                                     size_t size, enum dma_data_direction dir,
  44                                     enum dma_sync_target target);
  45
  46 /* Accessory functions. */
  47 extern void swiotlb_bounce(phys_addr_t phys, char *dma_addr, size_t size,
  48                            enum dma_data_direction dir);
  49
  50 extern void
  51 *swiotlb_alloc_coherent(struct device *hwdev, size_t size,
  52                         dma_addr_t *dma_handle, gfp_t flags);
  53
  54 extern void
  55 swiotlb_free_coherent(struct device *hwdev, size_t size,
  56                       void *vaddr, dma_addr_t dma_handle);
  57
  58 extern dma_addr_t swiotlb_map_page(struct device *dev, struct page *page,
  59                                    unsigned long offset, size_t size,
  60                                    enum dma_data_direction dir,
  61                                    struct dma_attrs *attrs);
  62 extern void swiotlb_unmap_page(struct device *hwdev, dma_addr_t dev_addr,
  63                                size_t size, enum dma_data_direction dir,
  64                                struct dma_attrs *attrs);
  65
  66 extern int
  67 swiotlb_map_sg(struct device *hwdev, struct scatterlist *sg, int nents,
  68                enum dma_data_direction dir);
  69
  70 extern void
  71 swiotlb_unmap_sg(struct device *hwdev, struct scatterlist *sg, int nents,
  72                  enum dma_data_direction dir);
  73
  74 extern int
  75 swiotlb_map_sg_attrs(struct device *hwdev, struct scatterlist *sgl, int nelems,
  76                      enum dma_data_direction dir, struct dma_attrs *attrs);
  77
  78 extern void
  79 swiotlb_unmap_sg_attrs(struct device *hwdev, struct scatterlist *sgl,
  80                        int nelems, enum dma_data_direction dir,
  81                        struct dma_attrs *attrs);
  82
  83 extern void
  84 swiotlb_sync_single_for_cpu(struct device *hwdev, dma_addr_t dev_addr,
  85                             size_t size, enum dma_data_direction dir);
  86
  87 extern void
  88 swiotlb_sync_sg_for_cpu(struct device *hwdev, struct scatterlist *sg,
  89                         int nelems, enum dma_data_direction dir);
  90
  91 extern void
  92 swiotlb_sync_single_for_device(struct device *hwdev, dma_addr_t dev_addr,
  93                                size_t size, enum dma_data_direction dir);
  94
  95 extern void
  96 swiotlb_sync_sg_for_device(struct device *hwdev, struct scatterlist *sg,
  97                            int nelems, enum dma_data_direction dir);
  98
  99 extern int
 100 swiotlb_dma_mapping_error(struct device *hwdev, dma_addr_t dma_addr);
 101
 102 extern int
 103 swiotlb_dma_supported(struct device *hwdev, u64 mask);
 104
 105 #ifdef CONFIG_SWIOTLB
 106 extern void __init swiotlb_free(void);
 107 #else
 108 static inline void swiotlb_free(void) { }
 109 #endif
 110
 111 extern void swiotlb_print_info(void);
 112 #endif /* __LINUX_SWIOTLB_H */