linux-kernel - Re: [RFC Patch v2 1/3] i2c debug counters as sysfs attributes

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Date:   Thu, 2 Dec 2021 21:35:13 -0800
From:   Sui Chen <suichen@...gle.com>
To:     Joe Perches <joe@...ches.com>, linux-kernel@...r.kernel.org
Cc:     openbmc@...ts.ozlabs.org, linux-i2c@...r.kernel.org,
        joel@....id.au, andrew@...id.au, tali.perry1@...il.com,
        benjaminfair@...gle.com, krellan@...gle.com
Subject: Re: [RFC Patch v2 1/3] i2c debug counters as sysfs attributes

On 12/2/21 6:50 PM, Joe Perches wrote:
> On Thu, 2021-12-02 at 18:37 -0800, Sui Chen wrote:
>> This change adds a few example I2C debug counters as sysfs attributes:
>> - ber_cnt (bus error count)
>> - nack_cnt (NACK count)
>> - rec_fail_cnt, rec_succ_cnt (recovery failure/success count)
>> - timeout_cnt (timeout count)
>> - i2c_speed (bus frequency)
>> - tx_complete_cnt (transaction completed, including both as an initiator
>>    and as a target)
>>
>> The function i2c_adapter_create_stats_folder creates a stats directory
>> in the device's sysfs directory to hold the debug counters. The platform
>> drivers are responsible for instantiating the counters in the stats
>> directory if applicable.
> 
> Please try to use scripts/checkpatch.pl on your patches and see if
> you should be more 'typical kernel style' compliant.
> 
> Ideally, use the --strict option too.
> 

Hello Joe,

I thank and really appreciate your spending time commenting on the 
patch, and on its previous version too. I ran checkpatch.pl and found a 
few code style fixes on patches 1 and 2.
Sorry for not checking the format before sending the email, I will 
definitely do the format check next time.

Regarding the patch itself, code style aside, we're wondering if this 
idea of exporting I2C statistics to sysfs looks reasonable? Do we need 
to accompany this change with design documents too (similar to PCIe AER 
reporting?)

We have done some more I2C-related performance and reliability tests; 
however it might take some more efforts to explore those ideas and 
summarize them into patches/documents. For now we would like to know 
about the comments on this sysfs attribute change first, since it is the 
initial step to the larger effort. Any comments will be greatly appreciated.

Thanks,
Sui