[linux-block.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 DMA_PTE_READ (1)
#define DMA_PTE_WRITE (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);
#else
static inline int iommu_calculate_agaw(struct intel_iommu *iommu)
{
	return 0;
}
#endif

extern int dmar_disabled;

#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
e61d98d8 SS	12	#define DMA_PTE_READ (1)
	13	#define DMA_PTE_WRITE (2)
	14
e61d98d8	15	struct intel_iommu;
99126f7c MM	16	struct dmar_domain;
99126f7c MM	17	struct root_entry;
e61d98d8	18
e61d98d8	19	extern void free_dmar_iommu(struct intel_iommu *iommu);
c66b9906 IM	20
c66b9906 IM	21	#ifdef CONFIG_DMAR
1b573683	22	extern int iommu_calculate_agaw(struct intel_iommu *iommu);
c66b9906 IM	23	#else
	24	static inline int iommu_calculate_agaw(struct intel_iommu *iommu)
	25	{
	26	return 0;
	27	}
	28	#endif
e61d98d8	29
2ae21010 SS	30	extern int dmar_disabled;
2ae21010 SS	31
e61d98d8	32	#endif