[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;


#ifdef CONFIG_INTEL_IOMMU
extern void free_dmar_iommu(struct intel_iommu *iommu);
extern int iommu_calculate_agaw(struct intel_iommu *iommu);
extern int iommu_calculate_max_sagaw(struct intel_iommu *iommu);
extern int dmar_disabled;
#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;
}
static inline void free_dmar_iommu(struct intel_iommu *iommu)
{
}
#define dmar_disabled	(1)
#endif


#endif
Commit	Line	Data
e61d98d8 SS	1	#ifndef _DMA_REMAPPING_H
	2	#define _DMA_REMAPPING_H
	3
	4	/*
5b6985ce	5	* VT-d hardware uses 4KiB page size regardless of host page size.
e61d98d8	6	*/
5b6985ce FY	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)
e61d98d8	11
6dd9a7c7 YS	12	#define VTD_STRIDE_SHIFT (9)
	13	#define VTD_STRIDE_MASK (((u64)-1) << VTD_STRIDE_SHIFT)
	14
e61d98d8 SS	15	#define DMA_PTE_READ (1)
e61d98d8 SS	16	#define DMA_PTE_WRITE (2)
6dd9a7c7	17	#define DMA_PTE_LARGE_PAGE (1 << 7)
9cf06697	18	#define DMA_PTE_SNP (1 << 11)
e61d98d8	19
4ed0d3e6	20	#define CONTEXT_TT_MULTI_LEVEL 0
93a23a72	21	#define CONTEXT_TT_DEV_IOTLB 1
4ed0d3e6 FY	22	#define CONTEXT_TT_PASS_THROUGH 2
4ed0d3e6 FY	23
e61d98d8	24	struct intel_iommu;
99126f7c MM	25	struct dmar_domain;
99126f7c MM	26	struct root_entry;
e61d98d8	27
c66b9906	28
d3f13810	29	#ifdef CONFIG_INTEL_IOMMU
318fe7df	30	extern void free_dmar_iommu(struct intel_iommu *iommu);
1b573683	31	extern int iommu_calculate_agaw(struct intel_iommu *iommu);
4ed0d3e6	32	extern int iommu_calculate_max_sagaw(struct intel_iommu *iommu);
f5d1b97b	33	extern int dmar_disabled;
c66b9906 IM	34	#else
	35	static inline int iommu_calculate_agaw(struct intel_iommu *iommu)
	36	{
	37	return 0;
	38	}
4ed0d3e6 FY	39	static inline int iommu_calculate_max_sagaw(struct intel_iommu *iommu)
	40	{
	41	return 0;
	42	}
318fe7df SS	43	static inline void free_dmar_iommu(struct intel_iommu *iommu)
	44	{
	45	}
f5d1b97b	46	#define dmar_disabled (1)
c66b9906	47	#endif
e61d98d8	48
2ae21010	49
e61d98d8	50	#endif