diff options
| author | David Woodhouse | 2009-06-28 11:55:58 +0100 |
|---|---|---|
| committer | David Woodhouse | 2009-06-29 13:33:59 +0100 |
| commit | 61df744314079e8cb8cdec75f517cf0e704e41ef (patch) | |
| tree | 55fd23fd2b1e909e203876d3d3b0d2eec879c675 /drivers/pci | |
| parent | 1c5a46ed49e37f56f8aa9000bb1c2ac59670c372 (diff) | |
intel-iommu: Introduce domain_pfn_mapping()
... and use it in the trivial cases; the other callers want individual
(and bisectable) attention, since I screwed them up the first time...
Make the BUG_ON() happen on too-large virtual address rather than
physical address, too. That's the one we care about.
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
Diffstat (limited to 'drivers/pci')
| -rw-r--r-- | drivers/pci/intel-iommu.c | 38 |
1 files changed, 24 insertions, 14 deletions
diff --git a/drivers/pci/intel-iommu.c b/drivers/pci/intel-iommu.c index f08d7865fe00..7540ef91d5f7 100644 --- a/drivers/pci/intel-iommu.c +++ b/drivers/pci/intel-iommu.c @@ -1643,40 +1643,48 @@ static int domain_context_mapped(struct pci_dev *pdev) tmp->devfn); } -static int -domain_page_mapping(struct dmar_domain *domain, dma_addr_t iova, - u64 hpa, size_t size, int prot) +static int domain_pfn_mapping(struct dmar_domain *domain, unsigned long iov_pfn, + unsigned long phys_pfn, unsigned long nr_pages, + int prot) { - unsigned long start_pfn = hpa >> VTD_PAGE_SHIFT; - unsigned long last_pfn = (hpa + size - 1) >> VTD_PAGE_SHIFT; struct dma_pte *pte; - int index = 0; int addr_width = agaw_to_width(domain->agaw) - VTD_PAGE_SHIFT; - BUG_ON(addr_width < BITS_PER_LONG && last_pfn >> addr_width); + BUG_ON(addr_width < BITS_PER_LONG && (iov_pfn + nr_pages - 1) >> addr_width); if ((prot & (DMA_PTE_READ|DMA_PTE_WRITE)) == 0) return -EINVAL; - while (start_pfn <= last_pfn) { - pte = pfn_to_dma_pte(domain, (iova >> VTD_PAGE_SHIFT) + index); + while (nr_pages--) { + pte = pfn_to_dma_pte(domain, iov_pfn); if (!pte) return -ENOMEM; /* We don't need lock here, nobody else * touches the iova range */ BUG_ON(dma_pte_addr(pte)); - dma_set_pte_pfn(pte, start_pfn); + dma_set_pte_pfn(pte, phys_pfn); dma_set_pte_prot(pte, prot); if (prot & DMA_PTE_SNP) dma_set_pte_snp(pte); domain_flush_cache(domain, pte, sizeof(*pte)); - start_pfn++; - index++; + iov_pfn++; + phys_pfn++; } return 0; } +static int domain_page_mapping(struct dmar_domain *domain, dma_addr_t iova, + u64 hpa, size_t size, int prot) +{ + unsigned long first_pfn = hpa >> VTD_PAGE_SHIFT; + unsigned long last_pfn = (hpa + size - 1) >> VTD_PAGE_SHIFT; + + return domain_pfn_mapping(domain, iova >> VTD_PAGE_SHIFT, first_pfn, + last_pfn - first_pfn + 1, prot); + +} + static void iommu_detach_dev(struct intel_iommu *iommu, u8 bus, u8 devfn) { if (!iommu) @@ -1893,8 +1901,10 @@ static int iommu_domain_identity_map(struct dmar_domain *domain, dma_pte_clear_range(domain, base >> VTD_PAGE_SHIFT, (base + size - 1) >> VTD_PAGE_SHIFT); - return domain_page_mapping(domain, base, base, size, - DMA_PTE_READ|DMA_PTE_WRITE); + return domain_pfn_mapping(domain, base >> VTD_PAGE_SHIFT, + base >> VTD_PAGE_SHIFT, + size >> VTD_PAGE_SHIFT, + DMA_PTE_READ|DMA_PTE_WRITE); } static int iommu_prepare_identity_map(struct pci_dev *pdev, |