[S390] cio: increase trace level

Move debug traces for start I/O and interrupt events to exclusive
trace levels. Also change tracing in hot-path from sprintf (costly)
to hex.

Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
diff --git a/drivers/s390/cio/device.c b/drivers/s390/cio/device.c
index b624022..19b4469 100644
--- a/drivers/s390/cio/device.c
+++ b/drivers/s390/cio/device.c
@@ -1168,8 +1168,8 @@
 
 	cdev = sch_get_cdev(sch);
 
-	CIO_TRACE_EVENT(3, "IRQ");
-	CIO_TRACE_EVENT(3, dev_name(&sch->dev));
+	CIO_TRACE_EVENT(6, "IRQ");
+	CIO_TRACE_EVENT(6, dev_name(&sch->dev));
 	if (cdev)
 		dev_fsm_event(cdev, DEV_EVENT_INTERRUPT);
 }