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...@samsung.com> --- drivers/iommu/iommu.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c index 349c92d..278055b 100644 --- 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; -- 1.7.10.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/