[S390] cio: introduce parent-initiated device move

Change the initiative to update subchannel-ccw device associations
to the subchannel: when there is an indication that the internal
association no longer reflects the current hardware state, mark
each affected subchannel as requiring attention. Once processing
reaches a subchannel, determine the correct association for that
subchannel at that time and perform the necessary device_move
operations.

This change fixes problems with the previous approach which would
leave devices in an inconsistent state when a new hardware change
occurred while a device_move was already scheduled.

Signed-off-by: Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

1 files changed, 7 insertions, 2 deletions

diff --git a/drivers/s390/cio/css.c b/drivers/s390/cio/css.c
index 91c25706fa83..b4df5a56cfe2 100644
--- a/drivers/s390/cio/css.c
+++ b/drivers/s390/cio/css.c
@@ -376,8 +376,8 @@ static int css_evaluate_new_subchannel(struct subchannel_id schid, int slow)
                 /* Unusable - ignore. */
                 return 0;
         }
-        CIO_MSG_EVENT(4, "Evaluating schid 0.%x.%04x, event %d, unknown, "
-                         "slow path.\n", schid.ssid, schid.sch_no, CIO_OPER);
+        CIO_MSG_EVENT(4, "event: sch 0.%x.%04x, new\n", schid.ssid,
+                      schid.sch_no);
 
         return css_probe_device(schid);
 }
@@ -394,6 +394,10 @@ static int css_evaluate_known_subchannel(struct subchannel *sch, int slow)
                                 "Got subchannel machine check but "
                                 "no sch_event handler provided.\n");
         }
+        if (ret != 0 && ret != -EAGAIN) {
+                CIO_MSG_EVENT(2, "eval: sch 0.%x.%04x, rc=%d\n",
+                              sch->schid.ssid, sch->schid.sch_no, ret);
+        }
         return ret;
 }
 
@@ -684,6 +688,7 @@ static int __init setup_css(int nr)
         css->pseudo_subchannel->dev.parent = &css->device;
         css->pseudo_subchannel->dev.release = css_subchannel_release;
         dev_set_name(&css->pseudo_subchannel->dev, "defunct");
+        mutex_init(&css->pseudo_subchannel->reg_mutex);
         ret = cio_create_sch_lock(css->pseudo_subchannel);
         if (ret) {
                 kfree(css->pseudo_subchannel);