On Tue, 14 Aug 2012, Alan Altmark wrote:
> On Tuesday, 08/14/2012 at 05:35 EDT, Neale Ferguson <ne...@sinenomine.net>
> > [root@serv-srv1 ~]# ls /sys/devices/css0/
> > 0.0.0000 0.0.0002 0.0.0004 0.0.0006 0.0.0008 chp0.01 chp0.a0
> chp0.f0 defunct uevent
> > 0.0.0001 0.0.0003 0.0.0005 0.0.0007 chp0.00 chp0.02 chp0.ef
> chp0.f1 power
> >
>
> That looks suspiciously like something created SID 8 when the device would
> have been using one of the SIDs 0-7. LINK, ATTACH, and DEFINE new SIDs
> *unless* there is an unused SID already in the I/O configuration. DETACH
> will, by definition, create an unused SID.
>
> Not sure what a 'defunct' event is, but sitting in my CompSci-animal
> hindbrain is the hope that the act of placing an event on the uevent queue
> is itself synchronous.
Hmm. I guess this confusion is caused by not using the fine tools we
provide - lscss in this case. ..But since we are here manually walking
the sysfs tree, let's have a look at the objects presented above:
* css0 - representing the channel subsystem with cssid 0; this directory
contains all children and all attributes of this object
* 0.X.YYYY - directories representing subchannels as children of css0
(all of these would contain a subdirectory representing
the attached ccw device)
* chp0.XX - directories representing channel paths used by Linux
* defunct - a special subchannel used for internal housekeeping
* power, uevent - files representing attributes of the "css0" object
(these are generic attributes available to virtually
all Linux devices)
Regards,
Sebastian
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