include/linux/iommu-helper.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _LINUX_IOMMU_HELPER_H
   3 #define _LINUX_IOMMU_HELPER_H
   4
   5 #include <linux/kernel.h>
   6
   7 static inline unsigned long iommu_device_max_index(unsigned long size,
   8                                                    unsigned long offset,
   9                                                    u64 dma_mask)
  10 {
  11         if (size + offset > dma_mask)
  12                 return dma_mask - offset + 1;
  13         else
  14                 return size;
  15 }
  16
  17 extern int iommu_is_span_boundary(unsigned int index, unsigned int nr,
  18                                   unsigned long shift,
  19                                   unsigned long boundary_size);
  20 extern unsigned long iommu_area_alloc(unsigned long *map, unsigned long size,
  21                                       unsigned long start, unsigned int nr,
  22                                       unsigned long shift,
  23                                       unsigned long boundary_size,
  24                                       unsigned long align_mask);
  25
  26 static inline unsigned long iommu_num_pages(unsigned long addr,
  27                                             unsigned long len,
  28                                             unsigned long io_page_size)
  29 {
  30         unsigned long size = (addr & (io_page_size - 1)) + len;
  31
  32         return DIV_ROUND_UP(size, io_page_size);
  33 }
  34
  35 #endif