include/linux/dma_remapping.h

   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