linux-kernel - Re: [PATCH] powernv: Add OCC driver to mmap sensor area

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Message-Id: <1506933302.25065.3.camel@au1.ibm.com>
Date:   Mon, 02 Oct 2017 10:35:02 +0200
From:   Benjamin Herrenschmidt <benh@....ibm.com>
To:     Stewart Smith <stewart@...ux.vnet.ibm.com>,
        Shilpasri G Bhat <shilpa.bhat@...ux.vnet.ibm.com>,
        mpe@...erman.id.au
Cc:     ego@...ux.vnet.ibm.com, linux-kernel@...r.kernel.org,
        paulus@...ba.org, linuxppc-dev@...ts.ozlabs.org,
        akshay.adiga@...ux.vnet.ibm.com
Subject: Re: [PATCH] powernv: Add OCC driver to mmap sensor area

On Mon, 2017-10-02 at 14:14 +1100, Stewart Smith wrote:
> Shilpasri G Bhat <shilpa.bhat@...ux.vnet.ibm.com> writes:
> > This driver provides interface to mmap the OCC sensor area
> > to userspace to parse and read OCC inband sensors.
> 
> Why?
> 
> Is this for debug? If so, the existing exports interface should be used.
> 
> If there's actual sensors, we already have two ways of exposing sensors
> to Linux: the OPAL_SENSOR API and the IMC API.
> 
> Why this method and not use the existing ones?

More than that, a sensor should be exposed to userspace via hwmon, not
some random direct userspace map.

Ben.