linux-kernel - Re: [PATCH] platform/x86: intel_pmc_core: export platform global

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Message-ID: <f930c11b-7324-19ee-9776-d97a90533b21@metux.net>
Date:   Fri, 2 Apr 2021 15:31:49 +0200
From:   "Enrico Weigelt, metux IT consult" <lkml@...ux.net>
To:     Tomas Winkler <tomas.winkler@...el.com>,
        Rajneesh Bhardwaj <irenic.rajneesh@...il.com>,
        David E Box <david.e.box@...el.com>,
        Hans de Goede <hdegoede@...hat.com>,
        Mark Gross <mgross@...ux.intel.com>
Cc:     platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org,
        Tamar Mashiah <tamar.mashiah@...el.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Subject: Re: [PATCH] platform/x86: intel_pmc_core: export platform
 global_reset via sysfs.

On 01.04.21 23:31, Tomas Winkler wrote:

Hi,

> During PCH manufacturing a global reset has to be induced in order
> for configuration changes take affect upon following platform reset.
> This setting was commonly done by accessing PMC registers via /dev/mem
> but due to security concern /dev/mem access is much restricted, hence
> the reason for exposing this setting via dedicated sysfs interface.
> To prevent post manufacturing abuse the register is protected
> by hardware locking.

could you please define "manufacturing" ? The chip or board ?

Is there any use for this, after the machine left the factory ?


--mtx

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Enrico Weigelt, metux IT consult
Free software and Linux embedded engineering
info@...ux.net -- +49-151-27565287