Message-ID: <12474042.O9o76ZdvQC@natalenko.name>
Date: Tue, 16 Jul 2024 18:37:30 +0200
From: Oleksandr Natalenko <oleksandr@...alenko.name>
To: Stefan Lippers-Hollmann <s.l-h@....de>,
 "Rafael J. Wysocki" <rafael@...nel.org>
Cc: "Rafael J. Wysocki" <rafael@...nel.org>,
 Daniel Lezcano <daniel.lezcano@...aro.org>,
 Eric Biggers <ebiggers@...nel.org>, "Rafael J. Wysocki" <rjw@...ysocki.net>,
 Linux PM <linux-pm@...r.kernel.org>, LKML <linux-kernel@...r.kernel.org>,
 Lukasz Luba <lukasz.luba@....com>,
 Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
 Zhang Rui <rui.zhang@...el.com>, Neil Armstrong <neil.armstrong@...aro.org>
Subject:
 Re: [PATCH v3] thermal: core: Call monitor_thermal_zone() if zone temperature
 is invalid

Hello.

On úterý 16. července 2024 16:04:16, SELČ Rafael J. Wysocki wrote:
> On Tue, Jul 16, 2024 at 3:20 PM Stefan Lippers-Hollmann <s.l-h@....de> wrote:
> >
> > Hi
> >
> > On 2024-07-16, Rafael J. Wysocki wrote:
> > > On Tue, Jul 16, 2024 at 1:36 PM Rafael J. Wysocki <rafael@...nel.org> wrote:
> > > > On Tue, Jul 16, 2024 at 1:15 PM Stefan Lippers-Hollmann <s.l-h@....de> wrote:
> > > > > On 2024-07-16, Stefan Lippers-Hollmann wrote:
> > > > > > On 2024-07-16, Rafael J. Wysocki wrote:
> > > > > > > On Tue, Jul 16, 2024 at 1:48 AM Stefan Lippers-Hollmann <s.l-h@....de> wrote:
> > > > > > > > On 2024-07-15, Rafael J. Wysocki wrote:
> > > > > > > > > On Mon, Jul 15, 2024 at 2:54 PM Stefan Lippers-Hollmann <s.l-h@....de> wrote:
> > > > > > > > > > On 2024-07-15, Rafael J. Wysocki wrote:
> > > > > > > > > > > On Mon, Jul 15, 2024 at 11:09 AM Daniel Lezcano
> > > > > > > > > > > <daniel.lezcano@...aro.org> wrote:
> > > > > > > > > > > > On 15/07/2024 06:45, Eric Biggers wrote:
> > > > > > > > > > > > > On Thu, Jul 04, 2024 at 01:46:26PM +0200, Rafael J. Wysocki wrote:
> > > > > > > > > > > > >> From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> > > > > > > > [...]
> > > > > > > > > > Silencing the warnings is already a big improvement - and that patch
> > > > > > > > > > works to this extent for me with an ax200, thanks.
> > > > > > > > >
> > > > > > > > > So attached is a patch that should avoid enabling the thermal zone
> > > > > > > > > when it is not ready for use in the first place, so it should address
> > > > > > > > > both the message and the useless polling.
> > > > > > > > >
> > > > > > > > > I would appreciate giving it a go (please note that it hasn't received
> > > > > > > > > much testing so far, though).
> > > > > > > >
> > > > > > > > Sadly this patch doesn't seem to help:
> > > > > > >
> > > > > > > This is likely because it is missing checks for firmware image type.
> > > > > > > I've added them to the attached new version.  Please try it.
> > > > > > >
> > > > > > > I've also added two pr_info() messages to get a better idea of what's
> > > > > > > going on, so please grep dmesg for "Thermal zone not ready" and
> > > > > > > "Enabling thermal zone".
> > > > > >
> > > > > > This is the output with the patch applied:
> > > > >
> > > > > The ax200 wlan interface is currently not up/ configured (system
> > > > > using its wired ethernet cards instead), the thermal_zone1 stops
> > > > > if I manually enable the interface (ip link set dev wlp4s0 up)
> > > > > after booting up:
> > > >
> > > > This explains it, thanks!
> > > >
> > > > The enabling of the thermal zone in iwl_mvm_load_ucode_wait_alive() is
> > > > premature or it should get disabled in the other two places that clear
> > > > the IWL_MVM_STATUS_FIRMWARE_RUNNING bit.
> > > >
> > > > I'm not sure why the thermal zone depends on whether or not this bit
> > > > is set, though. Is it really a good idea to return errors from it if
> > > > the interface is not up?
> > [...]
> > > > > [   22.033468] thermal thermal_zone1: failed to read out thermal zone (-61)
> > > > > [   22.213120] thermal thermal_zone1: Enabling thermal zone
> > > > > [   22.283954] iwlwifi 0000:04:00.0: Registered PHC clock: iwlwifi-PTP, with index: 0
> > > >
> > > > Thanks for this data point!
> > > >
> > > > AFAICS the thermal zone in iwlwifi is always enabled, but only valid
> > > > if the interface is up.  It looks to me like the thermal core needs a
> > > > special "don't poll me" error code to be returned in such cases.
> > >
> > > Attached is a thermal core patch with an iwlwifi piece along the lines
> > > above (tested lightly).  It adds a way for a driver to indicate that
> > > temperature cannot be provided at the moment, but that's OK and the
> > > core need not worry about that.
> > >
> > > Please give it a go.
> >
> > This seems to fail to build on top of v6.10, should I test Linus' HEAD
> > or some staging tree instead?
> 
> No, it's missing one hunk, sorry about that.
> 
> > [ I will be offline for the next few hours now, but will test it as soon
> >   as possible, probably in ~9-10 hours ]
> 
> No worries and thanks for your persistence!
> 
> >   CC      drivers/thermal/thermal_core.o
> > drivers/thermal/thermal_core.c: In function 'handle_thermal_trip':
> > drivers/thermal/thermal_core.c:383:37: error: 'THERMAL_TEMP_INIT' undeclared (first use in this function); did you mean 'THERMAL_TEMP_INVALID'?
> >   383 |             tz->last_temperature != THERMAL_TEMP_INIT) {
> >       |                                     ^~~~~~~~~~~~~~~~~
> >       |                                     THERMAL_TEMP_INVALID
> > drivers/thermal/thermal_core.c:383:37: note: each undeclared identifier is reported only once for each function it appears in
> > drivers/thermal/thermal_core.c: In function 'thermal_zone_device_init':
> > drivers/thermal/thermal_core.c:432:27: error: 'THERMAL_TEMP_INIT' undeclared (first use in this function); did you mean 'THERMAL_TEMP_INVALID'?
> >   432 |         tz->temperature = THERMAL_TEMP_INIT;
> >       |                           ^~~~~~~~~~~~~~~~~
> >       |                           THERMAL_TEMP_INVALID
> >
> 
> Attached is a new version that builds for me on top of plain 6.10.
> 

This builds and runs fine for me, no dmesg spamming any more. In `sensors` I get this:

```
iwlwifi_1-virtual-0
Adapter: Virtual device
temp1:       -274.0°C
```

(very beneficial during the heat wave)

There are no "thermal" messages in dmesg whatsoever, any other info you'd like me to provide?

Also, feel free to add:

Tested-by: Oleksandr Natalenko <oleksandr@...alenko.name>

Thank you.

-- 
Oleksandr Natalenko (post-factum)
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