linux-kernel - Re: [PATCH v6 06/11] firmware: xilinx: Add debugfs interface

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Date:   Thu, 10 May 2018 15:26:26 +0100
From:   Sudeep Holla <sudeep.holla@....com>
To:     Jolly Shah <jolly.shah@...inx.com>, ard.biesheuvel@...aro.org,
        mingo@...nel.org, gregkh@...uxfoundation.org,
        matt@...eblueprint.co.uk, hkallweit1@...il.com,
        keescook@...omium.org, dmitry.torokhov@...il.com,
        mturquette@...libre.com, sboyd@...eaurora.org,
        michal.simek@...inx.com, robh+dt@...nel.org, mark.rutland@....com,
        linux-clk@...r.kernel.org
Cc:     Sudeep Holla <sudeep.holla@....com>, rajanv@...inx.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, Jolly Shah <jollys@...inx.com>
Subject: Re: [PATCH v6 06/11] firmware: xilinx: Add debugfs interface



On 10/04/18 20:38, Jolly Shah wrote:
> From: Rajan Vaja <rajanv@...inx.com>
> 
> Firmware-debug provides debugfs interface to all APIs.
> Debugfs can be used to call firmware APIs with required
> parameters.
> 
> Usage:
> * Calling firmware API through debugfs:
>   # echo "<api-name> <arg1> .. <argn>" > /sys/.../zynqmp-firmware/pm
> 
> * Read output of last called firmware API:
>   # cat /sys/.../zynqmp-firmware/pm
> 
> Refer ug1200 for more information on these APIs:
>   * https://www.xilinx.com/support/documentation/user_guides/ug1200-eemi-api.pdf
> 
> Add basic debugfs file to get API version.
Who are the users of this apart from debugging ? I am bit over sensitive
as this remote processor manages/controls the power and other shared
resources in the system. Giving such fine grained access to user space
is not a good idea. I assume you want this DEBUGFS off by default on
production images ?

-- 
Regards,
Sudeep