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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. /* Extended context entry types */
  24. #define CONTEXT_TT_PT_PASID     4
  25. #define CONTEXT_TT_PT_PASID_DEV_IOTLB 5
  26. #define CONTEXT_TT_MASK (7ULL << 2)
  27.  
  28. #define CONTEXT_DINVE           (1ULL << 8)
  29. #define CONTEXT_PRS             (1ULL << 9)
  30. #define CONTEXT_PASIDE          (1ULL << 11)
  31.  
  32. struct intel_iommu;
  33. struct dmar_domain;
  34. struct root_entry;
  35.  
  36.  
  37. #ifdef CONFIG_INTEL_IOMMU
  38. extern int iommu_calculate_agaw(struct intel_iommu *iommu);
  39. extern int iommu_calculate_max_sagaw(struct intel_iommu *iommu);
  40. extern int dmar_disabled;
  41. extern int intel_iommu_enabled;
  42. #else
  43. static inline int iommu_calculate_agaw(struct intel_iommu *iommu)
  44. {
  45.         return 0;
  46. }
  47. static inline int iommu_calculate_max_sagaw(struct intel_iommu *iommu)
  48. {
  49.         return 0;
  50. }
  51. #define dmar_disabled   (1)
  52. #define intel_iommu_enabled (0)
  53. #endif
  54.  
  55.  
  56. #endif
  57.