s390/dasd: add support for control unit initiated reconfiguration
Add support for Control Unit Initiated Reconfiguration (CUIR) to
Linux, a storage server interface to reconcile concurrent hardware
changes between storage and host.
Reviewed-by: Stefan Weinhuber <wein@de.ibm.com>
Signed-off-by: Stefan Haberland <stefan.haberland@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
diff --git a/drivers/s390/block/dasd_devmap.c b/drivers/s390/block/dasd_devmap.c
index 14ba80b..8286f74 100644
--- a/drivers/s390/block/dasd_devmap.c
+++ b/drivers/s390/block/dasd_devmap.c
@@ -1432,6 +1432,29 @@
static DEVICE_ATTR(last_known_reservation_state, 0644,
dasd_reservation_state_show, dasd_reservation_state_store);
+static ssize_t dasd_pm_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct dasd_device *device;
+ u8 opm, nppm, cablepm, cuirpm, hpfpm;
+
+ device = dasd_device_from_cdev(to_ccwdev(dev));
+ if (IS_ERR(device))
+ return sprintf(buf, "0\n");
+
+ opm = device->path_data.opm;
+ nppm = device->path_data.npm;
+ cablepm = device->path_data.cablepm;
+ cuirpm = device->path_data.cuirpm;
+ hpfpm = device->path_data.hpfpm;
+ dasd_put_device(device);
+
+ return sprintf(buf, "%02x %02x %02x %02x %02x\n", opm, nppm,
+ cablepm, cuirpm, hpfpm);
+}
+
+static DEVICE_ATTR(path_masks, 0444, dasd_pm_show, NULL);
+
static struct attribute * dasd_attrs[] = {
&dev_attr_readonly.attr,
&dev_attr_discipline.attr,
@@ -1450,6 +1473,7 @@
&dev_attr_reservation_policy.attr,
&dev_attr_last_known_reservation_state.attr,
&dev_attr_safe_offline.attr,
+ &dev_attr_path_masks.attr,
NULL,
};