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 DMA_PTE_READ (1)
  13 #define DMA_PTE_WRITE (2)
  14 #define DMA_PTE_SNP (1 << 11)
  15
  16 #define CONTEXT_TT_MULTI_LEVEL  0
  17 #define CONTEXT_TT_DEV_IOTLB    1
  18 #define CONTEXT_TT_PASS_THROUGH 2
  19
  20 struct intel_iommu;
  21 struct dmar_domain;
  22 struct root_entry;
  23
  24 extern void free_dmar_iommu(struct intel_iommu *iommu);
  25
  26 #ifdef CONFIG_DMAR
  27 extern int iommu_calculate_agaw(struct intel_iommu *iommu);
  28 extern int iommu_calculate_max_sagaw(struct intel_iommu *iommu);
  29 #else
  30 static inline int iommu_calculate_agaw(struct intel_iommu *iommu)
  31 {
  32         return 0;
  33 }
  34 static inline int iommu_calculate_max_sagaw(struct intel_iommu *iommu)
  35 {
  36         return 0;
  37 }
  38 #endif
  39
  40 extern int dmar_disabled;
  41
  42 #endif