intel-iommu: Make dma_pte_clear_range() use pfns

Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>

1 files changed, 9 insertions, 13 deletions

diff --git a/drivers/pci/intel-iommu.c b/drivers/pci/intel-iommu.c
index ad367f53a2bb..d4217f737159 100644
--- a/drivers/pci/intel-iommu.c
+++ b/drivers/pci/intel-iommu.c
@@ -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;
-
-        BUG_ON(start >> addr_width);
-        BUG_ON((end-1) >> addr_width);
+        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;
 
-        /* in case it's partial page */
-        start &= PAGE_MASK;
-        end = PAGE_ALIGN(end);
-        npages = (end - start) / VTD_PAGE_SIZE;
+        BUG_ON(addr_width < BITS_PER_LONG && start_pfn >> addr_width);
+        BUG_ON(addr_width < BITS_PER_LONG && end_pfn >> addr_width);
 
-        /* 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++;
         }
 }