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Re: [PATCH 2/5] node_device: detect CSS devices



On Wed, Sep 09, 2020 at 03:01:50PM +0200, Cornelia Huck wrote:
> On Wed, 9 Sep 2020 14:46:00 +0200
> Erik Skultety <eskultet redhat com> wrote:
>
> > > > > Are ^these attributes documented a little more somewhere? I didn't find those
> > > > > in [1]. I suppose it is available in the z/Architecture: Principles of
> > >
> > > [BTW: what are [1] and [2] referring to?]
> >
> > Urgh...not again...
> > [1] https://www.ibm.com/support/knowledgecenter/zosbasics/com.ibm.zos.znetwork/znetwork_59.htm
> > [2] https://www.kernel.org/doc/html/latest/driver-api/s390-drivers.html
>
> TBH, I'm not sure how useful [2] is; it's mostly a vehicle for pulling

It wasn't, but it was the only resource mentioning something about the ccw bus
which was clearly relevant to patch 2/5 (udevProcessCSS).

> in kerneldoc documentation of structs and functions. There's also
> https://www.kernel.org/doc/html/latest/s390/driver-model.html, not sure
> if that is helpful.
>
> >
> > Sorry...
> >
> > >
> > > > > Operation publication for which I'd have to get an IBM account.
> > > > >
> > > >
> > > > Here's a freely available version of the PoP:
> > > >
> > > > https://www.ibm.com/support/pages/sites/default/files/inline-files/690450_SA22-7832-03.pdf
> > > >
> > > > I/O is described in chapter 13.
> > >
> > > Let me also point to a series of articles I did on my blog:
> > > https://virtualpenguins.blogspot.com/2017/02/channel-io-demystified.html
> >
> > Thanks, I've looked at both, it's still fairly cloudy though.
>
> Let me know if I can do anything to make it clearer. This channel I/O
> stuff probably can be a bit daunting...

Sure, you could shed a bit more light on this one:
https://www.redhat.com/archives/libvir-list/2020-September/msg00492.html

Erik


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