include/linux/dma_remapping.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _DMA_REMAPPING_H
   3 #define _DMA_REMAPPING_H
   4
   5 /*
   6  * VT-d hardware uses 4KiB page size regardless of host page size.
   7  */
   8 #define VTD_PAGE_SHIFT          (12)
   9 #define VTD_PAGE_SIZE           (1UL << VTD_PAGE_SHIFT)
  10 #define VTD_PAGE_MASK           (((u64)-1) << VTD_PAGE_SHIFT)
  11 #define VTD_PAGE_ALIGN(addr)    (((addr) + VTD_PAGE_SIZE - 1) & VTD_PAGE_MASK)
  12
  13 #define VTD_STRIDE_SHIFT        (9)
  14 #define VTD_STRIDE_MASK         (((u64)-1) << VTD_STRIDE_SHIFT)
  15
  16 #define DMA_PTE_READ (1)
  17 #define DMA_PTE_WRITE (2)
  18 #define DMA_PTE_LARGE_PAGE (1 << 7)
  19 #define DMA_PTE_SNP (1 << 11)
  20
  21 #define CONTEXT_TT_MULTI_LEVEL  0
  22 #define CONTEXT_TT_DEV_IOTLB    1
  23 #define CONTEXT_TT_PASS_THROUGH 2
  24 /* Extended context entry types */
  25 #define CONTEXT_TT_PT_PASID     4
  26 #define CONTEXT_TT_PT_PASID_DEV_IOTLB 5
  27 #define CONTEXT_TT_MASK (7ULL << 2)
  28
  29 #define CONTEXT_DINVE           (1ULL << 8)
  30 #define CONTEXT_PRS             (1ULL << 9)
  31 #define CONTEXT_PASIDE          (1ULL << 11)
  32
  33 struct intel_iommu;
  34 struct dmar_domain;
  35 struct root_entry;
  36
  37
  38 #ifdef CONFIG_INTEL_IOMMU
  39 extern int iommu_calculate_agaw(struct intel_iommu *iommu);
  40 extern int iommu_calculate_max_sagaw(struct intel_iommu *iommu);
  41 extern int dmar_disabled;
  42 extern int intel_iommu_enabled;
  43 extern int intel_iommu_tboot_noforce;
  44 #else
  45 static inline int iommu_calculate_agaw(struct intel_iommu *iommu)
  46 {
  47         return 0;
  48 }
  49 static inline int iommu_calculate_max_sagaw(struct intel_iommu *iommu)
  50 {
  51         return 0;
  52 }
  53 #define dmar_disabled   (1)
  54 #define intel_iommu_enabled (0)
  55 #endif
  56
  57
  58 #endif