[S390] cio: notify drivers of channel path events
This patch adds a notification mechanism to inform ccw drivers
about changes to channel paths, which occured while the device
is online.
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_fsm.c b/drivers/s390/cio/device_fsm.c
index c9b8526..4395c01 100644
--- a/drivers/s390/cio/device_fsm.c
+++ b/drivers/s390/cio/device_fsm.c
@@ -349,9 +349,13 @@
static void ccw_device_oper_notify(struct ccw_device *cdev)
{
+ struct subchannel *sch = to_subchannel(cdev->dev.parent);
+
if (ccw_device_notify(cdev, CIO_OPER) == NOTIFY_OK) {
/* Reenable channel measurements, if needed. */
ccw_device_sched_todo(cdev, CDEV_TODO_ENABLE_CMF);
+ /* Save indication for new paths. */
+ cdev->private->path_new_mask = sch->vpm;
return;
}
/* Driver doesn't want device back. */
@@ -462,6 +466,32 @@
}
}
+static void ccw_device_report_path_events(struct ccw_device *cdev)
+{
+ struct subchannel *sch = to_subchannel(cdev->dev.parent);
+ int path_event[8];
+ int chp, mask;
+
+ for (chp = 0, mask = 0x80; chp < 8; chp++, mask >>= 1) {
+ path_event[chp] = PE_NONE;
+ if (mask & cdev->private->path_gone_mask & ~(sch->vpm))
+ path_event[chp] |= PE_PATH_GONE;
+ if (mask & cdev->private->path_new_mask & sch->vpm)
+ path_event[chp] |= PE_PATH_AVAILABLE;
+ if (mask & cdev->private->pgid_reset_mask & sch->vpm)
+ path_event[chp] |= PE_PATHGROUP_ESTABLISHED;
+ }
+ if (cdev->online && cdev->drv->path_event)
+ cdev->drv->path_event(cdev, path_event);
+}
+
+static void ccw_device_reset_path_events(struct ccw_device *cdev)
+{
+ cdev->private->path_gone_mask = 0;
+ cdev->private->path_new_mask = 0;
+ cdev->private->pgid_reset_mask = 0;
+}
+
void
ccw_device_verify_done(struct ccw_device *cdev, int err)
{
@@ -498,6 +528,7 @@
&cdev->private->irb);
memset(&cdev->private->irb, 0, sizeof(struct irb));
}
+ ccw_device_report_path_events(cdev);
break;
case -ETIME:
case -EUSERS:
@@ -516,6 +547,7 @@
ccw_device_done(cdev, DEV_STATE_NOT_OPER);
break;
}
+ ccw_device_reset_path_events(cdev);
}
/*