Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
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 void free_dmar_iommu(struct intel_iommu *iommu);
31extern int iommu_calculate_agaw(struct intel_iommu *iommu);
32extern int iommu_calculate_max_sagaw(struct intel_iommu *iommu);
33extern int dmar_disabled;
34extern int intel_iommu_enabled;
35#else
36static inline int iommu_calculate_agaw(struct intel_iommu *iommu)
37{
38 return 0;
39}
40static inline int iommu_calculate_max_sagaw(struct intel_iommu *iommu)
41{
42 return 0;
43}
44static inline void free_dmar_iommu(struct intel_iommu *iommu)
45{
46}
47#define dmar_disabled (1)
48#define intel_iommu_enabled (0)
49#endif
50
51
52#endif