linux-kernel - Re: [PATCH 1/2] thermal: int340x: Add critical callback to override default shutdown behavior

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Message-ID: <CAAd53p7Q4+5JWzhhTrOvjrqf-bND3xVuwTX9-8PsSkaGq7yoQg@mail.gmail.com>
Date:   Tue, 22 Dec 2020 00:58:46 +0800
From:   Kai-Heng Feng <kai.heng.feng@...onical.com>
To:     Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
Cc:     "Zhang, Rui" <rui.zhang@...el.com>,
        Daniel Lezcano <daniel.lezcano@...aro.org>, amitk@...nel.org,
        Andrzej Pietrasiewicz <andrzej.p@...labora.com>,
        Matthew Garrett <mjg59@...gle.com>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        Peter Kaestle <peter@...e.net>,
        Gayatri Kammela <gayatri.kammela@...el.com>,
        Akinobu Mita <akinobu.mita@...il.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        "open list:THERMAL" <linux-pm@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] thermal: int340x: Add critical callback to override
 default shutdown behavior

On Tue, Dec 22, 2020 at 12:55 AM Srinivas Pandruvada
<srinivas.pandruvada@...ux.intel.com> wrote:
>
> On Mon, 2020-12-21 at 21:52 +0800, Kai-Heng Feng wrote:
> > We are seeing thermal shutdown on Intel based mobile workstations,
> > the
> > shutdown happens during the first trip handle in
> > thermal_zone_device_register():
> > kernel: thermal thermal_zone15: critical temperature reached (101 C),
> > shutting down
> >
> > However, we shouldn't do a thermal shutdown here, since
> > 1) We may want to use a dedicated daemon, Intel's thermald in this
> > case,
> > to handle thermal shutdown.
> >
> > 2) For ACPI based system, _CRT doesn't mean shutdown unless it's
> > inside
> > ThermalZone namespace. ACPI Spec, 11.4.4 _CRT (Critical Temperature):
> > "... If this object it present under a device, the device’s driver
> > evaluates this object to determine the device’s critical cooling
> > temperature trip point. This value may then be used by the device’s
> > driver to program an internal device temperature sensor trip point."
> >
> > So a "critical trip" here merely means we should take a more
> > aggressive
> > cooling method.
> >
> > As int340x device isn't present under ACPI ThermalZone, override the
> > default .critical callback to prevent surprising thermal shutdown.
> >
> > Signed-off-by: Kai-Heng Feng <kai.heng.feng@...onical.com>
> > ---
> >  drivers/thermal/intel/int340x_thermal/int3400_thermal.c     | 6
> > ++++++
> >  .../thermal/intel/int340x_thermal/int340x_thermal_zone.c    | 6
> > ++++++
> >  2 files changed, 12 insertions(+)
> >
> > diff --git a/drivers/thermal/intel/int340x_thermal/int3400_thermal.c
> > b/drivers/thermal/intel/int340x_thermal/int3400_thermal.c
> > index 823354a1a91a..9778a6dba939 100644
> > --- a/drivers/thermal/intel/int340x_thermal/int3400_thermal.c
> > +++ b/drivers/thermal/intel/int340x_thermal/int3400_thermal.c
> > @@ -431,9 +431,15 @@ static int int3400_thermal_change_mode(struct
> > thermal_zone_device *thermal,
> >         return result;
> >  }
> >
> > +static void int3400_thermal_critical(struct thermal_zone_device
> > *thermal)
> > +{
> > +       dev_dbg(&thermal->device, "%s: critical temperature
> > reached\n", thermal->type);
> > +}
> > +
> >  static struct thermal_zone_device_ops int3400_thermal_ops = {
> >         .get_temp = int3400_thermal_get_temp,
> >         .change_mode = int3400_thermal_change_mode,
> > +       .critical = int3400_thermal_critical,
> >  };
>
> You don't need for int3400 device. This is a fake sensor.

Thanks. Let me send a v2.

Kai-Heng

>
> >
> >  static struct thermal_zone_params int3400_thermal_params = {
> > diff --git
> > a/drivers/thermal/intel/int340x_thermal/int340x_thermal_zone.c
> > b/drivers/thermal/intel/int340x_thermal/int340x_thermal_zone.c
> > index 6e479deff76b..d1248ba943a4 100644
> > --- a/drivers/thermal/intel/int340x_thermal/int340x_thermal_zone.c
> > +++ b/drivers/thermal/intel/int340x_thermal/int340x_thermal_zone.c
> > @@ -146,12 +146,18 @@ static int int340x_thermal_get_trip_hyst(struct
> > thermal_zone_device *zone,
> >         return 0;
> >  }
> >
> > +static void int340x_thermal_critical(struct thermal_zone_device
> > *zone)
> > +{
> > +       dev_dbg(&zone->device, "%s: critical temperature reached\n",
> > zone->type);
> > +}
> > +
> >  static struct thermal_zone_device_ops int340x_thermal_zone_ops = {
> >         .get_temp       = int340x_thermal_get_zone_temp,
> >         .get_trip_temp  = int340x_thermal_get_trip_temp,
> >         .get_trip_type  = int340x_thermal_get_trip_type,
> >         .set_trip_temp  = int340x_thermal_set_trip_temp,
> >         .get_trip_hyst =  int340x_thermal_get_trip_hyst,
> > +       .critical       = int340x_thermal_critical,
> >  };
> >
> >  static int int340x_thermal_get_trip_config(acpi_handle handle, char
> > *name,
>
> Thanks,
> Srinivas
>
>