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
  15 struct intel_iommu;
  16 struct dmar_domain;
  17 struct root_entry;
  18
  19 extern void free_dmar_iommu(struct intel_iommu *iommu);
  20
  21 #ifdef CONFIG_DMAR
  22 extern int iommu_calculate_agaw(struct intel_iommu *iommu);
  23 #else
  24 static inline int iommu_calculate_agaw(struct intel_iommu *iommu)
  25 {
  26         return 0;
  27 }
  28 #endif
  29
  30 extern int dmar_disabled;
  31
  32 #endif