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
iommu_calculate_agaw(struct intel_iommu * iommu)30 static inline int iommu_calculate_agaw(struct intel_iommu *iommu)
31 {
32 	return 0;
33 }
iommu_calculate_max_sagaw(struct intel_iommu * iommu)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
43