linux-kernel - Re: [PATCH 3/3] hwmon: (occ) Provide the SBEFIFO FFDC in binary sysfs

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Message-ID: <990b5434-ed3e-7fe0-488f-f3ad55d48cee@linux.ibm.com>
Date:   Tue, 21 Sep 2021 10:57:07 -0500
From:   Eddie James <eajames@...ux.ibm.com>
To:     Greg KH <gregkh@...uxfoundation.org>
Cc:     linux-fsi@...ts.ozlabs.org, linux-hwmon@...r.kernel.org,
        linux-kernel@...r.kernel.org, joel@....id.au, linux@...ck-us.net,
        jdelvare@...e.com, alistair@...ple.id.au, jk@...abs.org
Subject: Re: [PATCH 3/3] hwmon: (occ) Provide the SBEFIFO FFDC in binary sysfs


On 9/21/21 10:37 AM, Greg KH wrote:
> On Tue, Sep 14, 2021 at 04:35:43PM -0500, Eddie James wrote:
>> Save any FFDC provided by the OCC driver, and provide it to userspace
>> through a binary sysfs entry. Do some basic state management to
>> ensure that userspace can always collect the data if there was an
>> error. Notify polling userspace when there is an error too.
>>
>> Signed-off-by: Eddie James <eajames@...ux.ibm.com>
>> ---
>>   drivers/hwmon/occ/p9_sbe.c | 98 +++++++++++++++++++++++++++++++++++++-
>>   1 file changed, 97 insertions(+), 1 deletion(-)
> You forgot a Documentation/ABI/ entry :(
>
> Binary sysfs files are for "pass through to the hardware" only, you
> should not be dumping kernel data to userspace through them.  I can't
> really determine if this is the case here or not, as there's no
> documentation saying what you are trying to represent here...


Ok oops. I will add an entry, thanks.

I believe this qualifies for binary sysfs then, since the data is an 
error response from the hardware directly.


Thanks,

Eddie


>
> thanks,
>
> greg k-h