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

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Date:   Tue, 8 Feb 2022 12:08:06 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Iwona Winiarska <iwona.winiarska@...el.com>
Cc:     linux-kernel@...r.kernel.org, openbmc@...ts.ozlabs.org,
        devicetree@...r.kernel.org, linux-aspeed@...ts.ozlabs.org,
        linux-arm-kernel@...ts.infradead.org, linux-hwmon@...r.kernel.org,
        linux-doc@...r.kernel.org, Rob Herring <robh+dt@...nel.org>,
        Joel Stanley <joel@....id.au>,
        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 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?

thanks,

greg k-h