Re: [PATCH v7 07/13] peci: Add sysfs interface for PECI bus - Greg Kroah-Hartman

From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: Iwona Winiarska <iwona.winiarska@intel.com>
Cc: linux-aspeed@lists.ozlabs.org, linux-doc@vger.kernel.org,
	Dave Hansen <dave.hansen@intel.com>,
	Zev Weiss <zweiss@equinix.com>, Jonathan Corbet <corbet@lwn.net>,
	openbmc@lists.ozlabs.org,
	Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>,
	Guenter Roeck <linux@roeck-us.net>,
	devicetree@vger.kernel.org, Jean Delvare <jdelvare@suse.com>,
	Arnd Bergmann <arnd@arndb.de>,
	Billy Tsai <billy_tsai@aspeedtech.com>,
	Rob Herring <robh+dt@kernel.org>, Borislav Petkov <bp@alien8.de>,
	Dan Williams <dan.j.williams@intel.com>,
	Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
	linux-arm-kernel@lists.infradead.org,
	linux-hwmon@vger.kernel.org, Tony Luck <tony.luck@intel.com>,
	Andrew Jeffery <andrew@aj.id.au>,
	Randy Dunlap <rdunlap@infradead.org>,
	linux-kernel@vger.kernel.org, Olof Johansson <olof@lixom.net>
Subject: Re: [PATCH v7 07/13] peci: Add sysfs interface for PECI bus
Date: Tue, 8 Feb 2022 12:08:06 +0100	[thread overview]
Message-ID: <YgJPFlr18AmWiTRY@kroah.com> (raw)
In-Reply-To: <20220202144838.163875-8-iwona.winiarska@intel.com>

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@intel.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