dma_remapping.h 1.38 KB
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#ifndef _DMA_REMAPPING_H
#define _DMA_REMAPPING_H

/*
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 * VT-d hardware uses 4KiB page size regardless of host page size.
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 */
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#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)
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#define VTD_STRIDE_SHIFT        (9)
#define VTD_STRIDE_MASK         (((u64)-1) << VTD_STRIDE_SHIFT)

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#define DMA_PTE_READ (1)
#define DMA_PTE_WRITE (2)
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#define DMA_PTE_LARGE_PAGE (1 << 7)
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#define DMA_PTE_SNP (1 << 11)
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#define CONTEXT_TT_MULTI_LEVEL	0
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#define CONTEXT_TT_DEV_IOTLB	1
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#define CONTEXT_TT_PASS_THROUGH 2
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/* Extended context entry types */
#define CONTEXT_TT_PT_PASID	4
#define CONTEXT_TT_PT_PASID_DEV_IOTLB 5
#define CONTEXT_TT_MASK (7ULL << 2)

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#define CONTEXT_DINVE		(1ULL << 8)
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#define CONTEXT_PRS		(1ULL << 9)
#define CONTEXT_PASIDE		(1ULL << 11)
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struct intel_iommu;
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struct dmar_domain;
struct root_entry;
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#ifdef CONFIG_INTEL_IOMMU
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extern int iommu_calculate_agaw(struct intel_iommu *iommu);
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extern int iommu_calculate_max_sagaw(struct intel_iommu *iommu);
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extern int dmar_disabled;
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extern int intel_iommu_enabled;
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#else
static inline int iommu_calculate_agaw(struct intel_iommu *iommu)
{
	return 0;
}
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static inline int iommu_calculate_max_sagaw(struct intel_iommu *iommu)
{
	return 0;
}
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#define dmar_disabled	(1)
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#define intel_iommu_enabled (0)
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#endif
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#endif