summaryrefslogtreecommitdiffstats
path: root/include/linux/dma_remapping.h
blob: 5619f8522738b44f3318392da050e7ef9f246020 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
#ifndef _DMA_REMAPPING_H
#define _DMA_REMAPPING_H

/*
 * VT-d hardware uses 4KiB page size regardless of host page size.
 */
#define VTD_PAGE_SHIFT		(12)
#define VTD_PAGE_SIZE		(1UL << VTD_PAGE_SHIFT)
#define VTD_PAGE_MASK		(((u64)-1) << VTD_PAGE_SHIFT)
#define VTD_PAGE_ALIGN(addr)	(((addr) + VTD_PAGE_SIZE - 1) & VTD_PAGE_MASK)

#define DMA_PTE_READ (1)
#define DMA_PTE_WRITE (2)
#define DMA_PTE_SNP (1 << 11)

#define CONTEXT_TT_MULTI_LEVEL	0
#define CONTEXT_TT_DEV_IOTLB	1
#define CONTEXT_TT_PASS_THROUGH 2

struct intel_iommu;
struct dmar_domain;
struct root_entry;

extern void free_dmar_iommu(struct intel_iommu *iommu);

#ifdef CONFIG_DMAR
extern int iommu_calculate_agaw(struct intel_iommu *iommu);
extern int iommu_calculate_max_sagaw(struct intel_iommu *iommu);
#else
static inline int iommu_calculate_agaw(struct intel_iommu *iommu)
{
	return 0;
}
static inline int iommu_calculate_max_sagaw(struct intel_iommu *iommu)
{
	return 0;
}
#endif

extern int dmar_disabled;

#endif
OpenPOWER on IntegriCloud