linux-kernel - [PATCH 2/7] iommu: Change iommu driver to call add_device_to

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Message-Id: <bffbc7422399e0c37141c084ca19a93609bacbc0.1376587770.git.shuah.kh@samsung.com>
Date:	Thu, 15 Aug 2013 11:59:24 -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 2/7] iommu: Change iommu driver to call add_device_to_group trace event

Change iommu driver to call add_device_to_group trace event. This iommu_group
class event can be enabled to trigger when devices get added to an iommu group.
Trace information includes iommu group id and device name.

Testing:
The following is trace is generated when intel-iommu driver adds devices to
to iommu groups during boot-time during its initialization:

       swapper/0-1     [003] ....     1.854793: add_device_to_group: IOMMU: groupID=0 device=0000:00:00.0
       swapper/0-1     [003] ....     1.854797: add_device_to_group: IOMMU: groupID=1 device=0000:00:02.0

Signed-off-by: Shuah Khan <shuah.kh@...sung.com>
---
 drivers/iommu/iommu.c |    2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index 58f6a16..349c92d 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -364,6 +364,8 @@ rename:
 	/* Notify any listeners about change to group. */
 	blocking_notifier_call_chain(&group->notifier,
 				     IOMMU_GROUP_NOTIFY_ADD_DEVICE, dev);
+
+	trace_add_device_to_group(group->id, dev);
 	return 0;
 }
 EXPORT_SYMBOL_GPL(iommu_group_add_device);
-- 
1.7.10.4

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