From 7f090145a14afc35844dce80174c9c24f9e66ec5 Mon Sep 17 00:00:00 2001 From: Cornelia Huck Date: Fri, 8 Dec 2006 15:56:02 +0100 Subject: [PATCH] [S390] Update documentation for dynamic subchannel mapping. Signed-off-by: Cornelia Huck Cc: Greg KH Signed-off-by: Andrew Morton Signed-off-by: Martin Schwidefsky --- Documentation/s390/driver-model.txt | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/Documentation/s390/driver-model.txt b/Documentation/s390/driver-model.txt index 77bf450ec39b..e938c442277d 100644 --- a/Documentation/s390/driver-model.txt +++ b/Documentation/s390/driver-model.txt @@ -18,11 +18,18 @@ devices/ - 0.0.0002/ - 0.1.0000/0.1.1234/ ... + - defunct/ In this example, device 0815 is accessed via subchannel 0 in subchannel set 0, device 4711 via subchannel 1 in subchannel set 0, and subchannel 2 is a non-I/O subchannel. Device 1234 is accessed via subchannel 0 in subchannel set 1. +The subchannel named 'defunct' does not represent any real subchannel on the +system; it is a pseudo subchannel where disconnnected ccw devices are moved to +if they are displaced by another ccw device becoming operational on their +former subchannel. The ccw devices will be moved again to a proper subchannel +if they become operational again on that subchannel. + You should address a ccw device via its bus id (e.g. 0.0.4711); the device can be found under bus/ccw/devices/.