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intel-iommu: Fix integer wrap on 32 bit kernels

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The following 64 bit promotions are necessary to handle memory above the
4GiB boundary correctly.

[dwmw2: Fix the second part not to need 64-bit arithmetic at all]

Signed-off-by: Benjamin LaHaise <ben.lahaise@neterion.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
This commit is contained in:
Benjamin LaHaise 2009-09-16 21:05:55 -04:00 committed by David Woodhouse
parent 59c36286b7
commit 64de5af000
1 changed files with 3 additions and 4 deletions
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7
drivers/pci/intel-iommu.c
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@ -735,7 +735,7 @@ static struct dma_pte *pfn_to_dma_pte(struct dmar_domain *domain,
return NULL;
domain_flush_cache(domain, tmp_page, VTD_PAGE_SIZE);
pteval = (virt_to_dma_pfn(tmp_page) << VTD_PAGE_SHIFT) | DMA_PTE_READ | DMA_PTE_WRITE;
pteval = ((uint64_t)virt_to_dma_pfn(tmp_page) << VTD_PAGE_SHIFT) | DMA_PTE_READ | DMA_PTE_WRITE;
if (cmpxchg64(&pte->val, 0ULL, pteval)) {
/* Someone else set it while we were thinking; use theirs. */
free_pgtable_page(tmp_page);
@ -2648,10 +2648,9 @@ static void flush_unmaps(void)
unsigned long mask;
struct iova *iova = deferred_flush[i].iova[j];
mask = (iova->pfn_hi - iova->pfn_lo + 1) << PAGE_SHIFT;
mask = ilog2(mask >> VTD_PAGE_SHIFT);
mask = ilog2(mm_to_dma_pfn(iova->pfn_hi - iova->pfn_lo + 1));
iommu_flush_dev_iotlb(deferred_flush[i].domain[j],
iova->pfn_lo << PAGE_SHIFT, mask);
(uint64_t)iova->pfn_lo << PAGE_SHIFT, mask);
__free_iova(&deferred_flush[i].domain[j]->iovad, iova);
}
deferred_flush[i].next = 0;