[mirror_ubuntu-artful-kernel.git] / include / linux / dma_remapping.h

#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 VTD_STRIDE_SHIFT        (9)
#define VTD_STRIDE_MASK         (((u64)-1) << VTD_STRIDE_SHIFT)

#define DMA_PTE_READ (1)
#define DMA_PTE_WRITE (2)
#define DMA_PTE_LARGE_PAGE (1 << 7)
#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
Commit	Line	Data
	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
	24	struct intel_iommu;
	25	struct dmar_domain;
	26	struct root_entry;
	27
	28	extern void free_dmar_iommu(struct intel_iommu *iommu);
	29
	30	#ifdef CONFIG_DMAR
	31	extern int iommu_calculate_agaw(struct intel_iommu *iommu);
	32	extern int iommu_calculate_max_sagaw(struct intel_iommu *iommu);
	33	#else
	34	static inline int iommu_calculate_agaw(struct intel_iommu *iommu)
	35	{
	36	return 0;
	37	}
	38	static inline int iommu_calculate_max_sagaw(struct intel_iommu *iommu)
	39	{
	40	return 0;
	41	}
	42	#endif
	43
	44	extern int dmar_disabled;
	45
	46	#endif