include/linux/iommu-helper.h

   1 #ifndef _LINUX_IOMMU_HELPER_H
   2 #define _LINUX_IOMMU_HELPER_H
   3
   4 #include <linux/kernel.h>
   5
   6 static inline unsigned long iommu_device_max_index(unsigned long size,
   7                                                    unsigned long offset,
   8                                                    u64 dma_mask)
   9 {
  10         if (size + offset > dma_mask)
  11                 return dma_mask - offset + 1;
  12         else
  13                 return size;
  14 }
  15
  16 extern int iommu_is_span_boundary(unsigned int index, unsigned int nr,
  17                                   unsigned long shift,
  18                                   unsigned long boundary_size);
  19 extern unsigned long iommu_area_alloc(unsigned long *map, unsigned long size,
  20                                       unsigned long start, unsigned int nr,
  21                                       unsigned long shift,
  22                                       unsigned long boundary_size,
  23                                       unsigned long align_mask);
  24
  25 static inline unsigned long iommu_num_pages(unsigned long addr,
  26                                             unsigned long len,
  27                                             unsigned long io_page_size)
  28 {
  29         unsigned long size = (addr & (io_page_size - 1)) + len;
  30
  31         return DIV_ROUND_UP(size, io_page_size);
  32 }
  33
  34 #endif