linux-kernel - Re: [PATCH v7 07/13] peci: Add sysfs interface for PECI bus

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Message-ID: <4892938763614967ba8b0f428afc1bc734f8f0b5.camel@intel.com>
Date:   Tue, 8 Feb 2022 14:48:45 +0000
From:   "Winiarska, Iwona" <iwona.winiarska@...el.com>
To:     "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>
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        "Williams, Dan J" <dan.j.williams@...el.com>
Subject: Re: [PATCH v7 07/13] peci: Add sysfs interface for PECI bus

On Tue, 2022-02-08 at 12:08 +0100, Greg Kroah-Hartman wrote:
> On Wed, Feb 02, 2022 at 03:48:32PM +0100, Iwona Winiarska wrote:
> > PECI devices may not be discoverable at the time when PECI controller is
> > being added (e.g. BMC can boot up when the Host system is still in S5).
> > Since we currently don't have the capabilities to figure out the Host
> > system state inside the PECI subsystem itself, we have to rely on
> > userspace to do it for us.
> > 
> > In the future, PECI subsystem may be expanded with mechanisms that allow
> > us to avoid depending on userspace interaction (e.g. CPU presence could
> > be detected using GPIO, and the information on whether it's discoverable
> > could be obtained over IPMI).
> > Unfortunately, those methods may ultimately not be available (support
> > will vary from platform to platform), which means that we still need
> > platform independent method triggered by userspace.
> > 
> > Signed-off-by: Iwona Winiarska <iwona.winiarska@...el.com>
> > ---
> >  Documentation/ABI/testing/sysfs-bus-peci | 16 +++++
> >  drivers/peci/Makefile                    |  2 +-
> >  drivers/peci/core.c                      |  3 +-
> >  drivers/peci/device.c                    |  1 +
> >  drivers/peci/internal.h                  |  5 ++
> >  drivers/peci/sysfs.c                     | 82 ++++++++++++++++++++++++
> >  6 files changed, 107 insertions(+), 2 deletions(-)
> >  create mode 100644 Documentation/ABI/testing/sysfs-bus-peci
> >  create mode 100644 drivers/peci/sysfs.c
> > 
> > diff --git a/Documentation/ABI/testing/sysfs-bus-peci
> > b/Documentation/ABI/testing/sysfs-bus-peci
> > new file mode 100644
> > index 000000000000..56c2b2216bbd
> > --- /dev/null
> > +++ b/Documentation/ABI/testing/sysfs-bus-peci
> > @@ -0,0 +1,16 @@
> > +What:          /sys/bus/peci/rescan
> > +Date:          July 2021
> > +KernelVersion: 5.15
> 
> 5.15 was a long time ago :(
> 
> 
> Other than this nit, these all look semi-sane to me.  What tree are you
> wanting these to go through, mine?  If so, can you fix this up (both
> places in this file) and resend?

Thank you! Yes, it would be great if it can go through your tree.
I'll send v8 with fixes.

Thanks
-Iwona

> 
> thanks,
> 
> greg k-h