linux-kernel - Re: [PATCH] powerpc/powernv: Enable reset_devices parameter to issue a PHB reset

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Message-Id: <5f9d3902-5982-7ea6-951f-10f2b90d00b4@linux.vnet.ibm.com>
Date:   Fri, 13 Oct 2017 10:02:58 -0300
From:   "Guilherme G. Piccoli" <gpiccoli@...ux.vnet.ibm.com>
To:     Michael Ellerman <mpe@...erman.id.au>
Cc:     linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        benh@...nel.crashing.org, paulus@...ba.org,
        maurosr@...ux.vnet.ibm.com
Subject: Re: [PATCH] powerpc/powernv: Enable reset_devices parameter to issue
 a PHB reset

On 10/13/2017 05:37 AM, Michael Ellerman wrote:
> 
> I really dislike this.
> 
> You're basically saying the kernel can't work out how to get a device
> working, so let's leave it up to the user.

Oh, it was never my intention to say such blasphemy :)
It meant to be just a debug option to help the users, specifically the
ones debugging drivers, to try using a hammer to recover bad devices! To
this issue that I mentioned as an example, the fix specifically goes in
the FW of the adapter.

Anyway, since you really dislike it, let's drop it, no big deal!
Cheers,

Guilherme

> 
> The driver should be fixed to detect that the device is not responding
> and request a reset.
> 
> cheers
>