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

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Message-ID: <CAEJqkggBvBus-G=TevSf0OUWLx_63qmZEThi-tNyPmAD2JXW-g@mail.gmail.com>
Date:   Sun, 12 Jan 2020 14:45:25 +0100
From:   Gabriel C <nix.or.die@...il.com>
To:     Guenter Roeck <linux@...ck-us.net>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        linux-hwmon@...r.kernel.org, Jean Delvare <jdelvare@...e.com>,
        Bart Van Assche <bvanassche@....org>,
        Linux Doc Mailing List <linux-doc@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-scsi <linux-scsi@...r.kernel.org>,
        "open list:LIBATA SUBSYSTEM (Serial and Parallel ATA drivers)" 
        <linux-ide@...r.kernel.org>, Chris Healy <cphealy@...il.com>
Subject: Re: [PATCH v2] hwmon: Driver for temperature sensors on SATA drives

Am So., 12. Jan. 2020 um 14:07 Uhr schrieb Guenter Roeck <linux@...ck-us.net>:
>
> On 1/12/20 4:07 AM, Linus Walleij wrote:
> > On Sun, Jan 12, 2020 at 1:03 PM Gabriel C <nix.or.die@...il.com> wrote:
> >> Am So., 12. Jan. 2020 um 12:22 Uhr schrieb Linus Walleij
> >> <linus.walleij@...aro.org>:
> >>>
> >>> On Sun, Jan 12, 2020 at 12:18 PM Gabriel C <nix.or.die@...il.com> wrote:
> >>>
> >>>> What I've noticed however is the nvme temperature low/high values on
> >>>> the Sensors X are strange here.
> >>> (...)
> >>>> Sensor 1:     +27.9°C  (low  = -273.1°C, high = +65261.8°C)
> >>>> Sensor 2:     +29.9°C  (low  = -273.1°C, high = +65261.8°C)
> >>> (...)
> >>>> Sensor 1:     +23.9°C  (low  = -273.1°C, high = +65261.8°C)
> >>>> Sensor 2:     +25.9°C  (low  = -273.1°C, high = +65261.8°C)
> >>>
> >>> That doesn't look strange to me. It seems like reasonable defaults
> >>> from the firmware if either it doesn't really log the min/max temperatures
> >>> or hasn't been through a cycle of updating these yet. Just set both
> >>> to absolute min/max temperatures possible.
> >>
> >> Ok I'll check that.
> >>
> >> Do you mean by setting the temperatures to use a lmsensors config?
> >> Or is there a way to set these with a nvme command?
> >
> > Not that I know of.
> >
> > The min/max are the minumum and maximum temperatures the
> > device has experienced during this power-on cycle.
> >
>
> No, that would be lowest/highest. The above are (or should be) per-sensor
> setpoints. The default for those is typically the absolute minimum /
> maximum of the supported range.
>
> Some SATA drives report the lowest/highest temperatures experienced
> since power cycle, like here.
>
> drivetemp-scsi-5-0
> Adapter: SCSI adapter
> temp1:        +23.0°C  (low  =  +0.0°C, high = +60.0°C)
>                         (crit low = -41.0°C, crit = +85.0°C)
>                         (lowest = +20.0°C, highest = +31.0°C)
>

The SATA temperatures are fine and reported like this here too, just
the nvme ones are strange.

drivetemp-scsi-4-0
Adapter: SCSI adapter
temp1:        +28.0°C  (low  =  +1.0°C, high = +61.0°C)
                      (crit low =  +2.0°C, crit = +60.0°C)
                      (lowest = +16.0°C, highest = +31.0°C)

drivetemp-scsi-12-0
Adapter: SCSI adapter
temp1:        +29.0°C  (low  =  +1.0°C, high = +61.0°C)
                      (crit low =  +2.0°C, crit = +60.0°C)
                      (lowest = +18.0°C, highest = +32.0°C)

and so on.

Btw, where I can find the code does these calculations?

Best regards,

Gabriel C.