LXR linux/include/linux/dma

   1#ifndef _DMA_REMAPPING_H
   2#define _DMA_REMAPPING_H
   3
   4/*
   5 * VT-d hardware uses 4KiB page size regardless of host page size.
   6 */
   7#define VTD_PAGE_SHIFT          (12)
   8#define VTD_PAGE_SIZE           (1UL << VTD_PAGE_SHIFT)
   9#define VTD_PAGE_MASK           (((u64)-1) << VTD_PAGE_SHIFT)
  10#define VTD_PAGE_ALIGN(addr)    (((addr) + VTD_PAGE_SIZE - 1) & VTD_PAGE_MASK)
  11
  12#define DMA_PTE_READ (1)
  13#define DMA_PTE_WRITE (2)
  14#define DMA_PTE_SNP (1 << 11)
  15
  16#define CONTEXT_TT_MULTI_LEVEL  0
  17#define CONTEXT_TT_DEV_IOTLB    1
  18#define CONTEXT_TT_PASS_THROUGH 2
  19
  20struct intel_iommu;
  21struct dmar_domain;
  22struct root_entry;
  23
  24extern void free_dmar_iommu(struct intel_iommu *iommu);
  25
  26#ifdef CONFIG_DMAR
  27extern int iommu_calculate_agaw(struct intel_iommu *iommu);
  28extern int iommu_calculate_max_sagaw(struct intel_iommu *iommu);
  29#else
  30static inline int iommu_calculate_agaw(struct intel_iommu *iommu)
  31{
  32        return 0;
  33}
  34static inline int iommu_calculate_max_sagaw(struct intel_iommu *iommu)
  35{
  36        return 0;
  37}
  38#endif
  39
  40extern int dmar_disabled;
  41
  42#endif
  43