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
  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