[S390] cio: introduce notifier for boxed state

If a ccw device did not respond in time during internal io, we set it
into boxed state. With this patch we have the following behaviour:
 * the ccw driver will get a notification if the device was online and
   goes into the boxed state
 * if the device was disconnected and got boxed nothing special is to be
   done (it will be handled in reprobing later)
 * if the device got boxed while initial sensing it will be unregistered
Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

arch/s390/include/asm/cio.h

@@ -456,6 +456,8 @@ struct ciw {
 #define CIO_OPER       0x0004
 /* Sick revalidation of device. */
 #define CIO_REVALIDATE 0x0008
+/* Device did not respond in time. */
+#define CIO_BOXED      0x0010
 
 /**
  * struct ccw_dev_id - unique identifier for ccw devices

drivers/s390/block/dasd.c

@@ -2363,6 +2363,7 @@ int dasd_generic_notify(struct ccw_device *cdev, int event)
 	ret = 0;
 	switch (event) {
 	case CIO_GONE:
+	case CIO_BOXED:
 	case CIO_NO_PATH:
 		/* First of all call extended error reporting. */
 		dasd_eer_write(device, NULL, DASD_EER_NOPATH);

drivers/s390/cio/device.c

@@ -1035,6 +1035,8 @@ io_subchannel_recog_done(struct ccw_device *cdev)
 		return;
 	}
 	switch (cdev->private->state) {
+	case DEV_STATE_BOXED:
+		/* Device did not respond in time. */
 	case DEV_STATE_NOT_OPER:
 		cdev->private->flags.recog_done = 1;
 		/* Remove device found not operational. */
@@ -1044,8 +1046,6 @@ io_subchannel_recog_done(struct ccw_device *cdev)
 		if (atomic_dec_and_test(&ccw_device_init_count))
 			wake_up(&ccw_device_init_wq);
 		break;
-	case DEV_STATE_BOXED:
-		/* Device did not respond in time. */
 	case DEV_STATE_OFFLINE:
 		/* 
 		 * We can't register the device in interrupt context so

drivers/s390/cio/device_fsm.c

@@ -256,15 +256,13 @@ ccw_device_recog_done(struct ccw_device *cdev, int state)
 		old_lpm = 0;
 	if (sch->lpm != old_lpm)
 		__recover_lost_chpids(sch, old_lpm);
-	if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID) {
-		if (state == DEV_STATE_NOT_OPER) {
+	if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID &&
+	    (state == DEV_STATE_NOT_OPER || state == DEV_STATE_BOXED)) {
 		cdev->private->flags.recog_done = 1;
 		cdev->private->state = DEV_STATE_DISCONNECTED;
 		wake_up(&cdev->private->wait_q);
 		return;
 	}
-		/* Boxed devices don't need extra treatment. */
-	}
 	notify = 0;
 	same_dev = 0; /* Keep the compiler quiet... */
 	switch (state) {
@@ -275,7 +273,7 @@ ccw_device_recog_done(struct ccw_device *cdev, int state)
 			      sch->schid.ssid, sch->schid.sch_no);
 		break;
 	case DEV_STATE_OFFLINE:
-		if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID) {
+		if (cdev->online) {
 			same_dev = ccw_device_handle_oper(cdev);
 			notify = 1;
 		}
@@ -308,6 +306,12 @@ ccw_device_recog_done(struct ccw_device *cdev, int state)
 			      " subchannel 0.%x.%04x\n",
 			      cdev->private->dev_id.devno,
 			      sch->schid.ssid, sch->schid.sch_no);
+		if (cdev->id.cu_type != 0) { /* device was recognized before */
+			cdev->private->flags.recog_done = 1;
+			cdev->private->state = DEV_STATE_BOXED;
+			wake_up(&cdev->private->wait_q);
+			return;
+		}
 		break;
 	}
 	cdev->private->state = state;
@@ -390,10 +394,13 @@ ccw_device_done(struct ccw_device *cdev, int state)
 
 	cdev->private->state = state;
 
-
-	if (state == DEV_STATE_BOXED)
+	if (state == DEV_STATE_BOXED) {
 		CIO_MSG_EVENT(0, "Boxed device %04x on subchannel %04x\n",
 			      cdev->private->dev_id.devno, sch->schid.sch_no);
+		if (cdev->online && !ccw_device_notify(cdev, CIO_BOXED))
+			ccw_device_schedule_sch_unregister(cdev);
+		cdev->private->flags.donotify = 0;
+	}
 
 	if (cdev->private->flags.donotify) {
 		cdev->private->flags.donotify = 0;

drivers/s390/scsi/zfcp_ccw.c

@@ -176,6 +176,11 @@ static int zfcp_ccw_notify(struct ccw_device *ccw_device, int event)
 		zfcp_erp_adapter_reopen(adapter, ZFCP_STATUS_COMMON_ERP_FAILED,
 					"ccnoti4", NULL);
 		break;
+	case CIO_BOXED:
+		dev_warn(&adapter->ccw_device->dev,
+			 "The ccw device did not respond in time.\n");
+		zfcp_erp_adapter_shutdown(adapter, 0, "ccnoti5", NULL);
+		break;
 	}
 	return 1;
 }