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

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Message-ID: <YgJT3bd8Uj8omVYz@kroah.com>
Date:   Tue, 8 Feb 2022 12:28:29 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Joel Stanley <joel@....id.au>
Cc:     Iwona Winiarska <iwona.winiarska@...el.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        OpenBMC Maillist <openbmc@...ts.ozlabs.org>,
        devicetree <devicetree@...r.kernel.org>,
        linux-aspeed <linux-aspeed@...ts.ozlabs.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        linux-hwmon@...r.kernel.org, linux-doc@...r.kernel.org,
        Rob Herring <robh+dt@...nel.org>,
        Andrew Jeffery <andrew@...id.au>,
        Jean Delvare <jdelvare@...e.com>,
        Guenter Roeck <linux@...ck-us.net>,
        Arnd Bergmann <arnd@...db.de>, Olof Johansson <olof@...om.net>,
        Jonathan Corbet <corbet@....net>,
        Borislav Petkov <bp@...en8.de>,
        Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>,
        Tony Luck <tony.luck@...el.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Randy Dunlap <rdunlap@...radead.org>,
        Zev Weiss <zweiss@...inix.com>,
        David Muller <d.mueller@...oft.ch>,
        Dave Hansen <dave.hansen@...el.com>,
        Billy Tsai <billy_tsai@...eedtech.com>
Subject: Re: [PATCH v7 07/13] peci: Add sysfs interface for PECI bus

On Tue, Feb 08, 2022 at 11:15:30AM +0000, Joel Stanley wrote:
> On Tue, 8 Feb 2022 at 11:08, Greg Kroah-Hartman
> <gregkh@...uxfoundation.org> 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?
> 
> Yes, I recommend Iwona send these through your tree.
> 
> Thanks for taking another look over them. Thanks to Iwona and Intel
> for doing this work.

Can you provide an ack or reviewed-by for them when they are reposted so
I know this?

thanks,

greg k-h