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
   8 struct device;
   9 struct dma_attrs;
  10 struct page;
  11 struct scatterlist;
  12
  13 extern 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
  28 extern void swiotlb_init(int verbose);
  29 int swiotlb_init_with_tbl(char *tlb, unsigned long nslabs, int verbose);
  30 extern unsigned long swiotlb_nr_tbl(void);
  31 unsigned long swiotlb_size_or_default(void);
  32 extern int swiotlb_late_init_with_tbl(char *tlb, unsigned long nslabs);
  33
  34 /*
  35  * Enumeration for sync targets
  36  */
  37 enum 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
  45 extern 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
  50 extern void swiotlb_tbl_unmap_single(struct device *hwdev,
  51                                      phys_addr_t tlb_addr,
  52                                      size_t size, enum dma_data_direction dir);
  53
  54 extern 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. */
  60 extern void
  61 *swiotlb_alloc_coherent(struct device *hwdev, size_t size,
  62                         dma_addr_t *dma_handle, gfp_t flags);
  63
  64 extern void
  65 swiotlb_free_coherent(struct device *hwdev, size_t size,
  66                       void *vaddr, dma_addr_t dma_handle);
  67
  68 extern 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);
  72 extern 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
  76 extern int
  77 swiotlb_map_sg(struct device *hwdev, struct scatterlist *sg, int nents,
  78                enum dma_data_direction dir);
  79
  80 extern void
  81 swiotlb_unmap_sg(struct device *hwdev, struct scatterlist *sg, int nents,
  82                  enum dma_data_direction dir);
  83
  84 extern int
  85 swiotlb_map_sg_attrs(struct device *hwdev, struct scatterlist *sgl, int nelems,
  86                      enum dma_data_direction dir, struct dma_attrs *attrs);
  87
  88 extern void
  89 swiotlb_unmap_sg_attrs(struct device *hwdev, struct scatterlist *sgl,
  90                        int nelems, enum dma_data_direction dir,
  91                        struct dma_attrs *attrs);
  92
  93 extern void
  94 swiotlb_sync_single_for_cpu(struct device *hwdev, dma_addr_t dev_addr,
  95                             size_t size, enum dma_data_direction dir);
  96
  97 extern void
  98 swiotlb_sync_sg_for_cpu(struct device *hwdev, struct scatterlist *sg,
  99                         int nelems, enum dma_data_direction dir);
 100
 101 extern void
 102 swiotlb_sync_single_for_device(struct device *hwdev, dma_addr_t dev_addr,
 103                                size_t size, enum dma_data_direction dir);
 104
 105 extern void
 106 swiotlb_sync_sg_for_device(struct device *hwdev, struct scatterlist *sg,
 107                            int nelems, enum dma_data_direction dir);
 108
 109 extern int
 110 swiotlb_dma_mapping_error(struct device *hwdev, dma_addr_t dma_addr);
 111
 112 extern int
 113 swiotlb_dma_supported(struct device *hwdev, u64 mask);
 114
 115 #ifdef CONFIG_SWIOTLB
 116 extern void __init swiotlb_free(void);
 117 #else
 118 static inline void swiotlb_free(void) { }
 119 #endif
 120
 121 extern void swiotlb_print_info(void);
 122 extern int is_swiotlb_buffer(phys_addr_t paddr);
 123
 124 #endif /* __LINUX_SWIOTLB_H */