iommu/vt-d: Remove debugfs use of private data field

Since the page fault report and response have been tracked by ftrace, the
users can easily calculate the time used for a page fault handling. There's
no need to expose the similar functionality in debugfs. Hence, remove the
corresponding operations in debugfs.

Signed-off-by: Jingqi Liu <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Lu Baolu <[email protected]>
Signed-off-by: Joerg Roedel <[email protected]>

1 files changed, 0 insertions, 9 deletions

diff --git a/drivers/iommu/intel/svm.c b/drivers/iommu/intel/svm.c
index ee3b469e2da1..e014350db354 100644
--- a/drivers/iommu/intel/svm.c
+++ b/drivers/iommu/intel/svm.c
@@ -583,12 +583,6 @@ static void intel_svm_prq_report(struct intel_iommu *iommu, struct device *dev,
 		event.fault.prm.flags |= IOMMU_FAULT_PAGE_REQUEST_PRIV_DATA;
 		event.fault.prm.private_data[0] = desc->priv_data[0];
 		event.fault.prm.private_data[1] = desc->priv_data[1];
-	} else if (dmar_latency_enabled(iommu, DMAR_LATENCY_PRQ)) {
-		/*
-		 * If the private data fields are not used by hardware, use it
-		 * to monitor the prq handle latency.
-		 */
-		event.fault.prm.private_data[0] = ktime_to_ns(ktime_get());
 	}
 
 	iommu_report_device_fault(dev, &event);
@@ -768,9 +762,6 @@ void intel_svm_page_response(struct device *dev, struct iopf_fault *evt,
 		if (private_present) {
 			desc.qw2 = prm->private_data[0];
 			desc.qw3 = prm->private_data[1];
-		} else if (prm->private_data[0]) {
-			dmar_latency_update(iommu, DMAR_LATENCY_PRQ,
-				ktime_to_ns(ktime_get()) - prm->private_data[0]);
 		}
 
 		qi_submit_sync(iommu, &desc, 1, 0);