Commit 7f090145 authored by Cornelia Huck's avatar Cornelia Huck Committed by Martin Schwidefsky

[S390] Update documentation for dynamic subchannel mapping.

Signed-off-by: default avatarCornelia Huck <>
Cc: Greg KH <>
Signed-off-by: default avatarAndrew Morton <>
Signed-off-by: default avatarMartin Schwidefsky <>
parent 529192f3
......@@ -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/.
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