linux-kernel - RE: [PATCH 0/5] firmware: xilinx: Add xilinx specific sysfs interface

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Date:   Thu, 2 Jan 2020 21:01:58 +0000
From:   Jolly Shah <JOLLYS@...inx.com>
To:     Sudeep Holla <sudeep.holla@....com>
CC:     "ard.biesheuvel@...aro.org" <ard.biesheuvel@...aro.org>,
        "mingo@...nel.org" <mingo@...nel.org>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "matt@...eblueprint.co.uk" <matt@...eblueprint.co.uk>,
        "hkallweit1@...il.com" <hkallweit1@...il.com>,
        "keescook@...omium.org" <keescook@...omium.org>,
        "dmitry.torokhov@...il.com" <dmitry.torokhov@...il.com>,
        Michal Simek <michals@...inx.com>,
        Rajan Vaja <RAJANV@...inx.com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH 0/5] firmware: xilinx: Add xilinx specific sysfs interface

Hi Sudeep,

Thanks for the review.

> -----Original Message-----
> From: Sudeep Holla <sudeep.holla@....com>
> Sent: Wednesday, December 18, 2019 6:46 AM
> To: Jolly Shah <JOLLYS@...inx.com>
> Cc: ard.biesheuvel@...aro.org; mingo@...nel.org;
> gregkh@...uxfoundation.org; matt@...eblueprint.co.uk;
> hkallweit1@...il.com; keescook@...omium.org;
> dmitry.torokhov@...il.com; Michal Simek <michals@...inx.com>; Rajan Vaja
> <RAJANV@...inx.com>; linux-arm-kernel@...ts.infradead.org; linux-
> kernel@...r.kernel.org; Sudeep Holla <sudeep.holla@....com>
> Subject: Re: [PATCH 0/5] firmware: xilinx: Add xilinx specific sysfs interface
> 
> On Wed, Dec 04, 2019 at 03:29:14PM -0800, Jolly Shah wrote:
> > This patch series adds xilinx specific sysfs interface for below
> > purposes:
> > - Register access
> > - Set shutdown scope
> > - Set boot health status bit
> 
> This series defeats the whole abstraction EEMI provides. By providing
> direct register accesses, you are allowing user-space to do whatever it
> wants. I had NACKed this idea before. Has anything changed ?
>

Firmware checks for allowed accesses only and rejects rest. 
 
> If you need it for testing firmware, better put them in debugfs which is
> off on production builds.

Sure. Will reanalyze use cases and move to debugfs only if that suffices.

Thanks,
Jolly Shah


> 
> --
> Regards,
> Sudeep