linux-kernel - [PATCH v4 07/22] iommu: Use device fault trace event

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Message-Id: <1560087862-57608-8-git-send-email-jacob.jun.pan@linux.intel.com>
Date:   Sun,  9 Jun 2019 06:44:07 -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>,
        Eric Auger <eric.auger@...hat.com>,
        Alex Williamson <alex.williamson@...hat.com>,
        Jean-Philippe Brucker <jean-philippe.brucker@....com>
Cc:     "Yi Liu" <yi.l.liu@...el.com>,
        "Tian, Kevin" <kevin.tian@...el.com>,
        Raj Ashok <ashok.raj@...el.com>,
        "Christoph Hellwig" <hch@...radead.org>,
        "Lu Baolu" <baolu.lu@...ux.intel.com>,
        Andriy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Jacob Pan <jacob.jun.pan@...ux.intel.com>
Subject: [PATCH v4 07/22] iommu: Use device fault trace event

For performance and debugging purposes, these trace events help
analyzing device faults 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>
[JPB: removed invalidate event, that will be added later]
Signed-off-by: Jean-Philippe Brucker <jean-philippe.brucker@....com>
---
 drivers/iommu/iommu.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index 64e87d5..166adb8 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -1032,6 +1032,7 @@ int iommu_report_device_fault(struct device *dev, struct iommu_fault_event *evt)
 	}
 
 	ret = fparam->handler(evt, fparam->data);
+	trace_dev_fault(dev, &evt->fault);
 done_unlock:
 	mutex_unlock(&param->lock);
 	return ret;
@@ -1604,6 +1605,7 @@ int iommu_page_response(struct device *dev,
 		if (evt->fault.prm.pasid == msg->pasid &&
 		    evt->fault.prm.grpid == msg->grpid) {
 			msg->iommu_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