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
28
29#ifdef CONFIG_INTEL_IOMMU
30extern int iommu_calculate_agaw(struct intel_iommu *iommu);
31extern int iommu_calculate_max_sagaw(struct intel_iommu *iommu);
32extern int dmar_disabled;
33extern int intel_iommu_enabled;
34#else
35static inline int iommu_calculate_agaw(struct intel_iommu *iommu)
36{
37	return 0;
38}
39static inline int iommu_calculate_max_sagaw(struct intel_iommu *iommu)
40{
41	return 0;
42}
43#define dmar_disabled	(1)
44#define intel_iommu_enabled (0)
45#endif
46
47
48#endif
49