iommu: Change iommu driver to call remove_device_to_group trace event

Change iommu driver to call remove_device_to_group trace event. This
iommu_group class event can be enabled to trigger when devices get
removed from an iommu group. Trace information includes iommu group id and
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] ....     1.854101: remove_device_from_group: IOMMU: groupID=0 device=0000:00:02.0

Signed-off-by: Shuah Khan <shuah.kh@samsung.com>
Signed-off-by: Joerg Roedel <joro@8bytes.org>

diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index 349c92dfce052b7999a20422ad7c0e5b7d3535aa..278055bd071552cd8ae68b660e4257d69483e0e9 100644 (file)
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -402,6 +402,8 @@ void iommu_group_remove_device(struct device *dev)
        sysfs_remove_link(group->devices_kobj, device->name);
        sysfs_remove_link(&dev->kobj, "iommu_group");
 
+       trace_remove_device_from_group(group->id, dev);
+
        kfree(device->name);
        kfree(device);
        dev->iommu_group = NULL;