linux-kernel - Re: [PATCH v2] hwmon: Driver for temperature sensors on SATA drives

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Date:   Wed, 18 Dec 2019 23:37:47 -0800
From:   Guenter Roeck <linux@...ck-us.net>
To:     "Martin K. Petersen" <martin.petersen@...cle.com>
Cc:     linux-hwmon@...r.kernel.org, Jean Delvare <jdelvare@...e.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Bart Van Assche <bvanassche@....org>,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-scsi@...r.kernel.org, linux-ide@...r.kernel.org,
        Chris Healy <cphealy@...il.com>
Subject: Re: [PATCH v2] hwmon: Driver for temperature sensors on SATA drives

Hi Martin,

On 12/18/19 4:15 PM, Martin K. Petersen wrote:
> 
> Guenter,
> 
>> This driver solves this problem by adding support for reading the
>> temperature of SATA drives from the kernel using the hwmon API and
>> by adding a temperature zone for each drive.
> 
> My working tree is available here:
> 
>    https://git.kernel.org/pub/scm/linux/kernel/git/mkp/linux.git/log/?h=5.6/drivetemp
> 

I had a quick look at the patch. Looks good overall. I think you should be able
to use the buffer allocated in struct drivetemp_data (named smartdata). Maybe
rename it to something more generic. If it needs to be dma-aligned, maybe we
can use kzalloc() to allocate it. Only reason I didn't use it for vpd was because
that needed 1024 bytes.

> A few notes:
> 
>   - Before applying your patch I did s/satatemp/drivetemp/
> 
>   - I get a crash in the driver core during probe if the drivetemp module
>     is loaded prior to loading ahci or a SCSI HBA driver. This crash is
>     unrelated to my changes. Haven't had time to debug.
> 
Definitely something we'll need to look into. Do you have a traceback ?

Thanks,
Guenter

>   - I tweaked your ATA detection heuristics and now use the cached VPD
>     page 0x89 instead of fetching one from the device.
> 
>   - I also added support for reading the temperature log page on SCSI
>     drives.
> 
>   - Tested with a mixed bag of about 40 SCSI and SATA drives attached.
> 
>   - I still think sensor naming needs work. How and where are the
>     "drivetemp-scsi-8-140" names generated?
> 
> I'll tinker some more but thought I'd share what I have for now.
>