netdev - Re: [PATCH net-next 1/1] net: wwan: t7xx: Add port for modem logging

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Message-ID: <20220520111541.30c96965@kernel.org>
Date:   Fri, 20 May 2022 11:15:41 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     "moises.veleta" <moises.veleta@...ux.intel.com>
Cc:     netdev@...r.kernel.org, davem@...emloft.net,
        johannes@...solutions.net, ryazanov.s.a@...il.com,
        loic.poulain@...aro.org, m.chetan.kumar@...el.com,
        chandrashekar.devegowda@...el.com, linuxwwan@...el.com,
        haijun.liu@...iatek.com, andriy.shevchenko@...ux.intel.com,
        ilpo.jarvinen@...ux.intel.com, ricardo.martinez@...ux.intel.com,
        sreehari.kancharla@...el.com, dinesh.sharma@...el.com
Subject: Re: [PATCH net-next 1/1] net: wwan: t7xx: Add port for modem
 logging

On Fri, 20 May 2022 11:01:31 -0700 moises.veleta wrote:
> On 5/20/22 10:48, Jakub Kicinski wrote:
> > On Fri, 20 May 2022 10:42:56 -0700 moises.veleta wrote:  
> >> Can we use debugfs to send an "on" or "off" commands, wherein the driver
> >> then sends special command sequences to the the firmware triggering the
> >> modem logging on and off?  
> > On/off for all logging or for particular types of messages?
> > If it's for all logging can't the act of opening the debugfs
> > file be used as on "on" signal and closing as "off"?
> >
> > Where do the logging messages go?  
> 
> It would be "on/off" for all logging.
> Yes, opening the debugfs file can be used for "on" and closing for "off" 
> without needing to use copy_from_user.

Sounds good. Can we also divert the actual logs so that they can be
read out of that debugfs file? That'd feel most natural to me..

> Logging messages would go to the relay interface file for consumption by 
> a user application.

What's the relay interface? a special netdev? chardev? tty?