intel-iommu: Defer the iotlb flush and iova free for intel_unmap_sg() too.

I see no reason why we did this _only_ in intel_unmap_page().

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

1 files changed, 12 insertions, 5 deletions

diff --git a/drivers/pci/intel-iommu.c b/drivers/pci/intel-iommu.c
index d6a857397ec..ee48fd07314 100644
--- a/drivers/pci/intel-iommu.c
+++ b/drivers/pci/intel-iommu.c
@@ -2815,11 +2815,18 @@ static void intel_unmap_sg(struct device *hwdev, struct scatterlist *sglist,
         /* free page tables */
         dma_pte_free_pagetable(domain, start_pfn, last_pfn);
 
-        iommu_flush_iotlb_psi(iommu, domain->id, start_pfn,
-                              (last_pfn - start_pfn + 1));
-
-        /* free iova */
-        __free_iova(&domain->iovad, iova);
+        if (intel_iommu_strict) {
+                iommu_flush_iotlb_psi(iommu, domain->id, start_pfn,
+                                      last_pfn - start_pfn + 1);
+                /* free iova */
+                __free_iova(&domain->iovad, iova);
+        } else {
+                add_unmap(domain, iova);
+                /*
+                 * queue up the release of the unmap to save the 1/6th of the
+                 * cpu used up by the iotlb flush operation...
+                 */
+        }
 }
 
 static int intel_nontranslate_map_sg(struct device *hddev,