iommu/vt-d: Remove redundant IOTLB flush

IOTLB flush already included in the PASID tear down and the page request
drain process. There is no need to flush again.

Signed-off-by: Jacob Pan <jacob.jun.pan@linux.intel.com>
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Link: https://lore.kernel.org/r/20200516062101.29541-17-baolu.lu@linux.intel.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>

diff --git a/drivers/iommu/intel-svm.c b/drivers/iommu/intel-svm.c
index 5ab71107afd5f9126e9ecdac659fd4b5e1d8d3fb..42f916b9667ebebfe24e24c06d9ba0e810390779 100644 (file)
--- a/drivers/iommu/intel-svm.c
+++ b/drivers/iommu/intel-svm.c
@@ -209,11 +209,9 @@ static void intel_mm_release(struct mmu_notifier *mn, struct mm_struct *mm)
         * *has* to handle gracefully without affecting other processes.
         */
        rcu_read_lock();
-       list_for_each_entry_rcu(sdev, &svm->devs, list) {
+       list_for_each_entry_rcu(sdev, &svm->devs, list)
                intel_pasid_tear_down_entry(svm->iommu, sdev->dev,
                                            svm->pasid, true);
-               intel_flush_svm_range_dev(svm, sdev, 0, -1, 0);
-       }
        rcu_read_unlock();
 
 }
@@ -403,7 +401,6 @@ int intel_svm_unbind_gpasid(struct device *dev, int pasid)
                        intel_pasid_tear_down_entry(iommu, dev,
                                                    svm->pasid, false);
                        intel_svm_drain_prq(dev, svm->pasid);
-                       intel_flush_svm_range_dev(svm, sdev, 0, -1, 0);
                        kfree_rcu(sdev, rcu);
 
                        if (list_empty(&svm->devs)) {
@@ -643,7 +640,6 @@ int intel_svm_unbind_mm(struct device *dev, int pasid)
                        intel_pasid_tear_down_entry(iommu, dev,
                                                    svm->pasid, false);
                        intel_svm_drain_prq(dev, svm->pasid);
-                       intel_flush_svm_range_dev(svm, sdev, 0, -1, 0);
                        kfree_rcu(sdev, rcu);
 
                        if (list_empty(&svm->devs)) {