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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: David Woodhouse <David.Woodhouse@intel.com>
This commit is contained in:
David Woodhouse 2009-06-27 16:21:20 +01:00
parent c7ab48d2ac
commit dd4e831960
1 changed files with 24 additions and 4 deletions
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28
drivers/pci/intel-iommu.c
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@ -65,6 +65,26 @@
#define PHYSICAL_PAGE_MASK PAGE_MASK
#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 */
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);
}
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)
@ -702,7 +722,7 @@ static struct dma_pte * addr_to_dma_pte(struct dmar_domain *domain, u64 addr)
return NULL;
}
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
* table control read/write
@ -1648,7 +1668,7 @@ domain_page_mapping(struct dmar_domain *domain, dma_addr_t iova,
* touches the iova range
*/
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);
if (prot & DMA_PTE_SNP)
dma_set_pte_snp(pte);