LXR linux/include/linux/dma

   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
  32struct intel_iommu;
  33struct dmar_domain;
  34struct root_entry;
  35
  36
  37#ifdef CONFIG_INTEL_IOMMU
  38extern int iommu_calculate_agaw(struct intel_iommu *iommu);
  39extern int iommu_calculate_max_sagaw(struct intel_iommu *iommu);
  40extern int dmar_disabled;
  41extern int intel_iommu_enabled;
  42#else
  43static inline int iommu_calculate_agaw(struct intel_iommu *iommu)
  44{
  45        return 0;
  46}
  47static 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