linux-kernel - [PATCH 4/7] iommu: Change iommu driver to call attach_device_to

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Date:	Thu, 15 Aug 2013 11:59:26 -0600
From:	Shuah Khan <shuah.kh@...sung.com>
To:	joro@...tes.org, alex.williamson@...hat.com,
	Varun.Sethi@...escale.com, aik@...abs.ru, joe@...ches.com,
	rostedt@...dmis.org, fweisbec@...il.com, mingo@...hat.com,
	tony@...mide.com, ohad@...ery.com, andreas.herrmann@...xeda.com,
	will.deacon@....com
Cc:	Shuah Khan <shuah.kh@...sung.com>, linux-kernel@...r.kernel.org,
	iommu@...ts.linux-foundation.org, shuahkhan@...il.com
Subject: [PATCH 4/7] iommu: Change iommu driver to call attach_device_to_domain trace event

Change iommu driver to call attach_device_to_domain trace event. This
iommu_device class event can be enabled to trigger when devices are attached
to a domain. Trace information includes device name.

Testing:
Added trace calls to iommu_prepare_identity_map() for testing some of the
conditions that are hard to trigger. Here is the trace from the testing:

      swapper/0-1     [003] ....     1.854102: attach_device_to_domain: IOMMU: device=0000:00:02.0

Signed-off-by: Shuah Khan <shuah.kh@...sung.com>
---
 drivers/iommu/iommu.c |    6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index 278055b..74c371c 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -685,10 +685,14 @@ EXPORT_SYMBOL_GPL(iommu_domain_free);
 
 int iommu_attach_device(struct iommu_domain *domain, struct device *dev)
 {
+	int ret;
 	if (unlikely(domain->ops->attach_dev == NULL))
 		return -ENODEV;
 
-	return domain->ops->attach_dev(domain, dev);
+	ret = domain->ops->attach_dev(domain, dev);
+	if (!ret)
+		trace_attach_device_to_domain(dev);
+	return ret;
 }
 EXPORT_SYMBOL_GPL(iommu_attach_device);
 
-- 
1.7.10.4

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