From 4f2ed183cfebf42b29ed8fe442169de97bc0fe61 Mon Sep 17 00:00:00 2001 From: Lu Baolu Date: Mon, 10 Dec 2018 09:58:57 +0800 Subject: iommu/vt-d: Move page table helpers into header So that they could also be used in other source files. Cc: Ashok Raj Cc: Jacob Pan Cc: Kevin Tian Cc: Liu Yi L Cc: Sanjay Kumar Signed-off-by: Lu Baolu Reviewed-by: Ashok Raj Reviewed-by: Kevin Tian Signed-off-by: Joerg Roedel --- include/linux/intel-iommu.h | 43 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 43 insertions(+) (limited to 'include/linux/intel-iommu.h') diff --git a/include/linux/intel-iommu.h b/include/linux/intel-iommu.h index 8c9b6063d275..b4da61385ebf 100644 --- a/include/linux/intel-iommu.h +++ b/include/linux/intel-iommu.h @@ -590,6 +590,49 @@ static inline void __iommu_flush_cache( clflush_cache_range(addr, size); } +/* + * 0: readable + * 1: writable + * 2-6: reserved + * 7: super page + * 8-10: available + * 11: snoop behavior + * 12-63: Host physcial address + */ +struct dma_pte { + u64 val; +}; + +static inline void dma_clear_pte(struct dma_pte *pte) +{ + pte->val = 0; +} + +static inline u64 dma_pte_addr(struct dma_pte *pte) +{ +#ifdef CONFIG_64BIT + return pte->val & VTD_PAGE_MASK; +#else + /* Must have a full atomic 64-bit read */ + return __cmpxchg64(&pte->val, 0ULL, 0ULL) & VTD_PAGE_MASK; +#endif +} + +static inline bool dma_pte_present(struct dma_pte *pte) +{ + return (pte->val & 3) != 0; +} + +static inline bool dma_pte_superpage(struct dma_pte *pte) +{ + return (pte->val & DMA_PTE_LARGE_PAGE); +} + +static inline int first_pte_in_page(struct dma_pte *pte) +{ + return !((unsigned long)pte & ~VTD_PAGE_MASK); +} + extern struct dmar_drhd_unit * dmar_find_matched_drhd_unit(struct pci_dev *dev); extern int dmar_find_matched_atsr_unit(struct pci_dev *dev); -- cgit v1.2.1