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
24struct intel_iommu;
25struct dmar_domain;
26struct root_entry;
27
28extern void free_dmar_iommu(struct intel_iommu *iommu);
29
30#ifdef CONFIG_DMAR
31extern int iommu_calculate_agaw(struct intel_iommu *iommu);
32extern int iommu_calculate_max_sagaw(struct intel_iommu *iommu);
33#else
34static inline int iommu_calculate_agaw(struct intel_iommu *iommu)
35{
36	return 0;
37}
38static inline int iommu_calculate_max_sagaw(struct intel_iommu *iommu)
39{
40	return 0;
41}
42#endif
43
44extern int dmar_disabled;
45
46#endif