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Commit dd4e8319 authored by David Woodhouse's avatar David Woodhouse
Browse files

intel-iommu: Change dma_set_pte_addr() to dma_set_pte_pfn() 



Add some helpers for converting between VT-d and normal system pfns,
since system pages can be larger than VT-d pages.

Signed-off-by: default avatarDavid Woodhouse <David.Woodhouse@intel.com>
parent c7ab48d2

drivers/pci/intel-iommu.c

+24 −4
Original line number Original line Diff line number Diff line
@@ -65,6 +65,26 @@ 
#define PHYSICAL_PAGE_MASK PAGE_MASK

#define PHYSICAL_PAGE_MASK PAGE_MASK

#endif

#endif





/* VT-d pages must always be _smaller_ than MM pages. Otherwise things

   are never going to work. */

static inline unsigned long dma_to_mm_pfn(unsigned long dma_pfn)

{

	return dma_pfn >> (PAGE_SHIFT - VTD_PAGE_SHIFT);

}



static inline unsigned long mm_to_dma_pfn(unsigned long mm_pfn)

{

	return mm_pfn << (PAGE_SHIFT - VTD_PAGE_SHIFT);

}

static inline unsigned long page_to_dma_pfn(struct page *pg)

{

	return mm_to_dma_pfn(page_to_pfn(pg));

}

static inline unsigned long virt_to_dma_pfn(void *p)

{

	return page_to_dma_pfn(virt_to_page(p));

}



/* global iommu list, set NULL for ignored DMAR units */

/* global iommu list, set NULL for ignored DMAR units */

static struct intel_iommu **g_iommus;

static struct intel_iommu **g_iommus;
@@ -207,9 +227,9 @@ static inline u64 dma_pte_addr(struct dma_pte *pte) 
	return (pte->val & VTD_PAGE_MASK);

	return (pte->val & VTD_PAGE_MASK);

}

}





static inline void dma_set_pte_addr(struct dma_pte *pte, u64 addr)

static inline void dma_set_pte_pfn(struct dma_pte *pte, unsigned long pfn)

{

{

	pte->val |= (addr & VTD_PAGE_MASK);

	pte->val |= (uint64_t)pfn << VTD_PAGE_SHIFT;

}

}





static inline bool dma_pte_present(struct dma_pte *pte)

static inline bool dma_pte_present(struct dma_pte *pte)
@@ -702,7 +722,7 @@ static struct dma_pte * addr_to_dma_pte(struct dmar_domain *domain, u64 addr) 
				return NULL;

				return NULL;

			}

			}

			domain_flush_cache(domain, tmp_page, PAGE_SIZE);

			domain_flush_cache(domain, tmp_page, PAGE_SIZE);

			dma_set_pte_addr(pte, virt_to_phys(tmp_page));

			dma_set_pte_pfn(pte, virt_to_dma_pfn(tmp_page));

			/*

			/*

			 * high level table always sets r/w, last level page

			 * high level table always sets r/w, last level page

			 * table control read/write

			 * table control read/write
@@ -1648,7 +1668,7 @@ domain_page_mapping(struct dmar_domain *domain, dma_addr_t iova, 
		 * touches the iova range

		 * touches the iova range

		 */

		 */

		BUG_ON(dma_pte_addr(pte));

		BUG_ON(dma_pte_addr(pte));

		dma_set_pte_addr(pte, start_pfn << VTD_PAGE_SHIFT);

		dma_set_pte_pfn(pte, start_pfn);

		dma_set_pte_prot(pte, prot);

		dma_set_pte_prot(pte, prot);

		if (prot & DMA_PTE_SNP)

		if (prot & DMA_PTE_SNP)

			dma_set_pte_snp(pte);

			dma_set_pte_snp(pte);