linux/include/linux/dma_remapping.h
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   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 VTD_STRIDE_SHIFT        (9)
  13#define VTD_STRIDE_MASK         (((u64)-1) << VTD_STRIDE_SHIFT)
  14
  15#define DMA_PTE_READ (1)
  16#define DMA_PTE_WRITE (2)
  17#define DMA_PTE_LARGE_PAGE (1 << 7)
  18#define DMA_PTE_SNP (1 << 11)
  19
  20#define CONTEXT_TT_MULTI_LEVEL  0
  21#define CONTEXT_TT_DEV_IOTLB    1
  22#define CONTEXT_TT_PASS_THROUGH 2
  23
  24struct intel_iommu;
  25struct dmar_domain;
  26struct root_entry;
  27
  28
  29#ifdef CONFIG_INTEL_IOMMU
  30extern void free_dmar_iommu(struct intel_iommu *iommu);
  31extern int iommu_calculate_agaw(struct intel_iommu *iommu);
  32extern int iommu_calculate_max_sagaw(struct intel_iommu *iommu);
  33extern int dmar_disabled;
  34extern int intel_iommu_enabled;
  35#else
  36static inline int iommu_calculate_agaw(struct intel_iommu *iommu)
  37{
  38        return 0;
  39}
  40static inline int iommu_calculate_max_sagaw(struct intel_iommu *iommu)
  41{
  42        return 0;
  43}
  44static inline void free_dmar_iommu(struct intel_iommu *iommu)
  45{
  46}
  47#define dmar_disabled   (1)
  48#define intel_iommu_enabled (0)
  49#endif
  50
  51
  52#endif
  53
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