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intel-iommu: Make dma_pte_clear_range() use pfns 

Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
This commit is contained in:
David Woodhouse 2009-06-27 19:15:01 +01:00
parent 66eae8469e
commit 04b18e65dd
1 changed files with 9 additions and 13 deletions
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22
drivers/pci/intel-iommu.c
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@ -779,21 +779,17 @@ static void dma_pte_clear_one(struct dmar_domain *domain, unsigned long pfn)
/* clear last level pte, a tlb flush should be followed */
static void dma_pte_clear_range(struct dmar_domain *domain, u64 start, u64 end)
{
int addr_width = agaw_to_width(domain->agaw);
int npages;
unsigned long start_pfn = IOVA_PFN(start);
unsigned long end_pfn = IOVA_PFN(end-1);
int addr_width = agaw_to_width(domain->agaw) - VTD_PAGE_SHIFT;
BUG_ON(start >> addr_width);
BUG_ON((end-1) >> addr_width);
BUG_ON(addr_width < BITS_PER_LONG && start_pfn >> addr_width);
BUG_ON(addr_width < BITS_PER_LONG && end_pfn >> addr_width);
/* in case it's partial page */
start &= PAGE_MASK;
end = PAGE_ALIGN(end);
npages = (end - start) / VTD_PAGE_SIZE;
/* we don't need lock here, nobody else touches the iova range */
while (npages--) {
dma_pte_clear_one(domain, start >> VTD_PAGE_SHIFT);
start += VTD_PAGE_SIZE;
/* we don't need lock here; nobody else touches the iova range */
while (start_pfn <= end_pfn) {
dma_pte_clear_one(domain, start_pfn);
start_pfn++;
}
}