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

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Message-ID: <yq1r211dvck.fsf@oracle.com>
Date:   Wed, 18 Dec 2019 19:15:07 -0500
From:   "Martin K. Petersen" <martin.petersen@...cle.com>
To:     Guenter Roeck <linux@...ck-us.net>
Cc:     linux-hwmon@...r.kernel.org, Jean Delvare <jdelvare@...e.com>,
        "Martin K . Petersen" <martin.petersen@...cle.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


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

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.

 - 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.

-- 
Martin K. Petersen	Oracle Linux Engineering