linux-kernel - Re: [PATCH v2 6/6] topology/sysfs: Add PPIN in sysfs under cpu topology

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Message-ID: <YffJbnO5uyYptFAd@kroah.com>
Date:   Mon, 31 Jan 2022 12:35:10 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Tony Luck <tony.luck@...el.com>
Cc:     Borislav Petkov <bp@...en8.de>, x86@...nel.org,
        linux-kernel@...r.kernel.org,
        Smita Koralahalli Channabasappa 
        <smita.koralahallichannabasappa@....com>,
        Wei Huang <wei.huang2@....com>,
        Tom Lendacky <thomas.lendacky@....com>, patches@...ts.linux.dev
Subject: Re: [PATCH v2 6/6] topology/sysfs: Add PPIN in sysfs under cpu
 topology

On Fri, Jan 21, 2022 at 09:47:43AM -0800, Tony Luck wrote:
> PPIN is the Protected Processor Identification Number.
> This is used to identify the socket as a Field Replaceable Unit (FRU).
> 
> Existing code only displays this when reporting errors. But this makes
> it inconvenient for large clusters to use it for its intended purpose
> of inventory control.
> 
> Add ppin to /sys/devices/system/cpu/cpu*/topology to make what
> is already available using RDMSR more easily accessible. Make
> the file read only for root in case there are still people
> concerned about making a unique system "serial number" available.
> 
> Signed-off-by: Tony Luck <tony.luck@...el.com>
> ---
>  Documentation/ABI/stable/sysfs-devices-system-cpu  | 4 ++++
>  Documentation/ABI/testing/sysfs-devices-system-cpu | 6 ++++++
>  arch/x86/include/asm/topology.h                    | 1 +
>  drivers/base/topology.c                            | 4 ++++
>  include/linux/topology.h                           | 3 +++
>  5 files changed, 18 insertions(+)

Acked-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>