s390/cio: log fake IRB events

Add traces when queueing and delivering fake IRBs. These are significant
events that might have an impact on device driver processing and are
therefore relevant for problem analysis.
Reviewed-by: Vineeth Vijayan <vneethv@linux.ibm.com>
Signed-off-by: Peter Oberparleiter <oberpar@linux.ibm.com>
Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>

drivers/s390/cio/device_fsm.c

@@ -504,6 +504,11 @@ void ccw_device_verify_done(struct ccw_device *cdev, int err)
 		ccw_device_done(cdev, DEV_STATE_ONLINE);
 		/* Deliver fake irb to device driver, if needed. */
 		if (cdev->private->flags.fake_irb) {
+			CIO_MSG_EVENT(2, "fakeirb: deliver device 0.%x.%04x intparm %lx type=%d\n",
+				      cdev->private->dev_id.ssid,
+				      cdev->private->dev_id.devno,
+				      cdev->private->intparm,
+				      cdev->private->flags.fake_irb);
 			create_fake_irb(&cdev->private->dma_area->irb,
 					cdev->private->flags.fake_irb);
 			cdev->private->flags.fake_irb = 0;

drivers/s390/cio/device_ops.c

@@ -208,6 +208,10 @@ int ccw_device_start_timeout_key(struct ccw_device *cdev, struct ccw1 *cpa,
 		if (!cdev->private->flags.fake_irb) {
 			cdev->private->flags.fake_irb = FAKE_CMD_IRB;
 			cdev->private->intparm = intparm;
+			CIO_MSG_EVENT(2, "fakeirb: queue device 0.%x.%04x intparm %lx type=%d\n",
+				      cdev->private->dev_id.ssid,
+				      cdev->private->dev_id.devno, intparm,
+				      cdev->private->flags.fake_irb);
 			return 0;
 		} else
 			/* There's already a fake I/O around. */
@@ -551,6 +555,10 @@ int ccw_device_tm_start_timeout_key(struct ccw_device *cdev, struct tcw *tcw,
 		if (!cdev->private->flags.fake_irb) {
 			cdev->private->flags.fake_irb = FAKE_TM_IRB;
 			cdev->private->intparm = intparm;
+			CIO_MSG_EVENT(2, "fakeirb: queue device 0.%x.%04x intparm %lx type=%d\n",
+				      cdev->private->dev_id.ssid,
+				      cdev->private->dev_id.devno, intparm,
+				      cdev->private->flags.fake_irb);
 			return 0;
 		} else
 			/* There's already a fake I/O around. */