LXR linux/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/bug.h>
   6#include <linux/kernel.h>
   7
   8static inline unsigned long iommu_device_max_index(unsigned long size,
   9                                                   unsigned long offset,
  10                                                   u64 dma_mask)
  11{
  12        if (size + offset > dma_mask)
  13                return dma_mask - offset + 1;
  14        else
  15                return size;
  16}
  17
  18static inline int iommu_is_span_boundary(unsigned int index, unsigned int nr,
  19                unsigned long shift, unsigned long boundary_size)
  20{
  21        BUG_ON(!is_power_of_2(boundary_size));
  22
  23        shift = (shift + index) & (boundary_size - 1);
  24        return shift + nr > boundary_size;
  25}
  26
  27extern unsigned long iommu_area_alloc(unsigned long *map, unsigned long size,
  28                                      unsigned long start, unsigned int nr,
  29                                      unsigned long shift,
  30                                      unsigned long boundary_size,
  31                                      unsigned long align_mask);
  32
  33static inline unsigned long iommu_num_pages(unsigned long addr,
  34                                            unsigned long len,
  35                                            unsigned long io_page_size)
  36{
  37        unsigned long size = (addr & (io_page_size - 1)) + len;
  38
  39        return DIV_ROUND_UP(size, io_page_size);
  40}
  41
  42#endif
  43