linux-kernel - Re: [PATCH v6 6/9] misc: smpro-errmon: Add Ampere's SMpro error monitor driver

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Date:   Mon, 7 Mar 2022 15:32:10 +0700
From:   Quan Nguyen <quan@...amperecomputing.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Joel Stanley <joel@....id.au>, Andrew Jeffery <andrew@...id.au>,
        Jean Delvare <jdelvare@...e.com>,
        Guenter Roeck <linux@...ck-us.net>,
        Rob Herring <robh+dt@...nel.org>,
        Lee Jones <lee.jones@...aro.org>,
        Jonathan Corbet <corbet@....net>, linux-hwmon@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-doc@...r.kernel.org, linux-aspeed@...ts.ozlabs.org,
        openbmc@...ts.ozlabs.org, Mark Brown <broonie@...nel.org>,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        Derek Kiernan <derek.kiernan@...inx.com>,
        Dragan Cvetic <dragan.cvetic@...inx.com>,
        Arnd Bergmann <arnd@...db.de>,
        Gustavo Pimentel <Gustavo.Pimentel@...opsys.com>,
        Open Source Submission <patches@...erecomputing.com>,
        Phong Vo <phong@...amperecomputing.com>,
        "Thang Q . Nguyen" <thang@...amperecomputing.com>
Subject: Re: [PATCH v6 6/9] misc: smpro-errmon: Add Ampere's SMpro error
 monitor driver

On 24/12/2021 15:32, Greg Kroah-Hartman wrote:
> On Fri, Dec 24, 2021 at 11:13:49AM +0700, Quan Nguyen wrote:
>> This commit adds Ampere's SMpro error monitor driver for monitoring
>> and reporting RAS-related errors as reported by SMpro co-processor
>> found on Ampere's Altra processor family.
>>
>> Signed-off-by: Quan Nguyen <quan@...amperecomputing.com>
>> ---
>> Change in v6:
>>    + First introduced in v6 [Quan]
>>
>>   drivers/mfd/smpro-mfd.c     |   1 +
>>   drivers/misc/Kconfig        |   7 +
>>   drivers/misc/Makefile       |   1 +
>>   drivers/misc/smpro-errmon.c | 571 ++++++++++++++++++++++++++++++++++++
>>   4 files changed, 580 insertions(+)
>>   create mode 100644 drivers/misc/smpro-errmon.c
> 
> You need Documentation/ABI/ updates when you add sysfs files.  Please do
> that for your next version of this patch.
> 

Thanks greg for the review,
Will update Documentation/ABI/testing/sysfs-* file in next version.

> Also remember that sysfs is only "one value per file", this driver seems
> to violate that in huge ways and is not ok.
> 

These sysfs's does not return "multi value per file" but a single record 
of data, one example is to return the 48-byte ARM RAS Vendor specific 
error record.

Thanks
- Quan