From: Cornelia Huck Date: Fri, 8 Dec 2006 14:56:02 +0000 (+0100) Subject: [S390] Update documentation for dynamic subchannel mapping. X-Git-Tag: v2.6.20-rc1~34^2~31^2~3 X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=7f090145a14afc35844dce80174c9c24f9e66ec5;p=linux-2.6 [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 --- diff --git a/Documentation/s390/driver-model.txt b/Documentation/s390/driver-model.txt index 77bf450ec3..e938c44227 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/.