include/asm-i386/mach-xen/asm/dma-mapping.h

   1 #ifndef _ASM_I386_DMA_MAPPING_H
   2 #define _ASM_I386_DMA_MAPPING_H
   3
   4 /*
   5  * IOMMU interface. See Documentation/DMA-mapping.txt and DMA-API.txt for
   6  * documentation.
   7  */
   8
   9 #include <linux/mm.h>
  10 #include <asm/cache.h>
  11 #include <asm/io.h>
  12 #include <asm/scatterlist.h>
  13 #include <asm/swiotlb.h>
  14
  15 static inline int
  16 address_needs_mapping(struct device *hwdev, dma_addr_t addr)
  17 {
  18         dma_addr_t mask = 0xffffffff;
  19         /* If the device has a mask, use it, otherwise default to 32 bits */
  20         if (hwdev && hwdev->dma_mask)
  21                 mask = *hwdev->dma_mask;
  22         return (addr & ~mask) != 0;
  23 }
  24
  25 static inline int
  26 range_straddles_page_boundary(void *p, size_t size)
  27 {
  28         extern unsigned long *contiguous_bitmap;
  29         return (((((unsigned long)p & ~PAGE_MASK) + size) > PAGE_SIZE) &&
  30                 !test_bit(__pa(p) >> PAGE_SHIFT, contiguous_bitmap));
  31 }
  32
  33 #define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f)
  34 #define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h)
  35
  36 void *dma_alloc_coherent(struct device *dev, size_t size,
  37                            dma_addr_t *dma_handle, gfp_t flag);
  38
  39 void dma_free_coherent(struct device *dev, size_t size,
  40                          void *vaddr, dma_addr_t dma_handle);
  41
  42 extern dma_addr_t
  43 dma_map_single(struct device *dev, void *ptr, size_t size,
  44                enum dma_data_direction direction);
  45
  46 extern void
  47 dma_unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size,
  48                  enum dma_data_direction direction);
  49
  50 extern int dma_map_sg(struct device *hwdev, struct scatterlist *sg,
  51                       int nents, enum dma_data_direction direction);
  52 extern void dma_unmap_sg(struct device *hwdev, struct scatterlist *sg,
  53                          int nents, enum dma_data_direction direction);
  54
  55 extern dma_addr_t
  56 dma_map_page(struct device *dev, struct page *page, unsigned long offset,
  57              size_t size, enum dma_data_direction direction);
  58
  59 extern void
  60 dma_unmap_page(struct device *dev, dma_addr_t dma_address, size_t size,
  61                enum dma_data_direction direction);
  62
  63 extern void
  64 dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle, size_t size,
  65                         enum dma_data_direction direction);
  66
  67 extern void
  68 dma_sync_single_for_device(struct device *dev, dma_addr_t dma_handle, size_t size,
  69                            enum dma_data_direction direction);
  70
  71 static inline void
  72 dma_sync_single_range_for_cpu(struct device *dev, dma_addr_t dma_handle,
  73                               unsigned long offset, size_t size,
  74                               enum dma_data_direction direction)
  75 {
  76         dma_sync_single_for_cpu(dev, dma_handle+offset, size, direction);
  77 }
  78
  79 static inline void
  80 dma_sync_single_range_for_device(struct device *dev, dma_addr_t dma_handle,
  81                                  unsigned long offset, size_t size,
  82                                  enum dma_data_direction direction)
  83 {
  84         dma_sync_single_for_device(dev, dma_handle+offset, size, direction);
  85 }
  86
  87 static inline void
  88 dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, int nelems,
  89                     enum dma_data_direction direction)
  90 {
  91         if (swiotlb)
  92                 swiotlb_sync_sg_for_cpu(dev,sg,nelems,direction);
  93         flush_write_buffers();
  94 }
  95
  96 static inline void
  97 dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, int nelems,
  98                     enum dma_data_direction direction)
  99 {
 100         if (swiotlb)
 101                 swiotlb_sync_sg_for_device(dev,sg,nelems,direction);
 102         flush_write_buffers();
 103 }
 104
 105 extern int
 106 dma_mapping_error(dma_addr_t dma_addr);
 107
 108 extern int
 109 dma_supported(struct device *dev, u64 mask);
 110
 111 static inline int
 112 dma_set_mask(struct device *dev, u64 mask)
 113 {
 114         if(!dev->dma_mask || !dma_supported(dev, mask))
 115                 return -EIO;
 116
 117         *dev->dma_mask = mask;
 118
 119         return 0;
 120 }
 121
 122 static inline int
 123 dma_get_cache_alignment(void)
 124 {
 125         /* no easy way to get cache size on all x86, so return the
 126          * maximum possible, to be safe */
 127         return (1 << INTERNODE_CACHE_SHIFT);
 128 }
 129
 130 #define dma_is_consistent(d)    (1)
 131
 132 static inline void
 133 dma_cache_sync(void *vaddr, size_t size,
 134                enum dma_data_direction direction)
 135 {
 136         flush_write_buffers();
 137 }
 138
 139 #define ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY
 140 extern int
 141 dma_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr,
 142                             dma_addr_t device_addr, size_t size, int flags);
 143
 144 extern void
 145 dma_release_declared_memory(struct device *dev);
 146
 147 extern void *
 148 dma_mark_declared_memory_occupied(struct device *dev,
 149                                   dma_addr_t device_addr, size_t size);
 150
 151 #endif