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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.  
  24. struct intel_iommu;
  25. struct dmar_domain;
  26. struct root_entry;
  27.  
  28.  
  29. #ifdef CONFIG_INTEL_IOMMU
  30. extern int iommu_calculate_agaw(struct intel_iommu *iommu);
  31. extern int iommu_calculate_max_sagaw(struct intel_iommu *iommu);
  32. extern int dmar_disabled;
  33. extern int intel_iommu_enabled;
  34. #else
  35. static inline int iommu_calculate_agaw(struct intel_iommu *iommu)
  36. {
  37.         return 0;
  38. }
  39. static inline int iommu_calculate_max_sagaw(struct intel_iommu *iommu)
  40. {
  41.         return 0;
  42. }
  43. #define dmar_disabled   (1)
  44. #define intel_iommu_enabled (0)
  45. #endif
  46.  
  47.  
  48. #endif
  49.