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...@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 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 -- 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/