linux-kernel - [PATCH v4 22/22] iommu: use sva invalidate and device fault trace event

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Date:   Mon, 16 Apr 2018 14:49:11 -0700
From:   Jacob Pan <jacob.jun.pan@...ux.intel.com>
To:     iommu@...ts.linux-foundation.org,
        LKML <linux-kernel@...r.kernel.org>,
        Joerg Roedel <joro@...tes.org>,
        David Woodhouse <dwmw2@...radead.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Alex Williamson <alex.williamson@...hat.com>,
        Jean-Philippe Brucker <jean-philippe.brucker@....com>
Cc:     Rafael Wysocki <rafael.j.wysocki@...el.com>,
        "Liu, Yi L" <yi.l.liu@...el.com>,
        "Tian, Kevin" <kevin.tian@...el.com>,
        Raj Ashok <ashok.raj@...el.com>,
        Jean Delvare <khali@...ux-fr.org>,
        "Christoph Hellwig" <hch@...radead.org>,
        "Lu Baolu" <baolu.lu@...ux.intel.com>,
        Jacob Pan <jacob.jun.pan@...ux.intel.com>
Subject: [PATCH v4 22/22] iommu: use sva invalidate and device fault trace event

For performance and debugging purposes, these trace events help
analyzing device faults and passdown invalidations that interact
with IOMMU subsystem.
E.g.
IOMMU:0000:00:0a.0 type=2 reason=0 addr=0x00000000007ff000 pasid=1
group=1 last=0 prot=1

Signed-off-by: Jacob Pan <jacob.jun.pan@...ux.intel.com>
---
 drivers/iommu/iommu.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index f6512692..e2090d2 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -979,6 +979,7 @@ int iommu_report_device_fault(struct device *dev, struct iommu_fault_event *evt)
 		mutex_unlock(&fparam->lock);
 	}
 	ret = fparam->handler(evt, fparam->data);
+	trace_dev_fault(dev, evt);
 done_unlock:
 	mutex_unlock(&dev->iommu_param->lock);
 	return ret;
@@ -1547,6 +1548,7 @@ int iommu_sva_invalidate(struct iommu_domain *domain,
 		return -ENODEV;
 
 	ret = domain->ops->sva_invalidate(domain, dev, inv_info);
+	trace_sva_invalidate(dev, inv_info);
 
 	return ret;
 }
@@ -1584,6 +1586,7 @@ int iommu_page_response(struct device *dev,
 		if (evt->pasid == msg->pasid &&
 		    msg->page_req_group_id == evt->page_req_group_id) {
 			msg->private_data = evt->iommu_private;
+			trace_dev_page_response(dev, msg);
 			ret = domain->ops->page_response(dev, msg);
 			list_del(&evt->list);
 			kfree(evt);
-- 
2.7.4