linux-kernel - Re: [PATCH v1 2/3] thermal/debugfs: Pass cooling device state to thermal_debug_cdev

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Date: Thu, 25 Apr 2024 21:10:39 +0200
From: "Rafael J. Wysocki" <rafael@...nel.org>
To: Lukasz Luba <lukasz.luba@....com>
Cc: "Rafael J. Wysocki" <rafael@...nel.org>, "Rafael J. Wysocki" <rjw@...ysocki.net>, 
	LKML <linux-kernel@...r.kernel.org>, Linux PM <linux-pm@...r.kernel.org>, 
	Daniel Lezcano <daniel.lezcano@...aro.org>
Subject: Re: [PATCH v1 2/3] thermal/debugfs: Pass cooling device state to thermal_debug_cdev_add()

On Thu, Apr 25, 2024 at 8:55 PM Lukasz Luba <lukasz.luba@....com> wrote:
>
>
>
> On 4/25/24 19:53, Rafael J. Wysocki wrote:
> > On Thu, Apr 25, 2024 at 8:42 PM Lukasz Luba <lukasz.luba@....com> wrote:
> >>
> >>
> >>
> >> On 4/25/24 14:00, Rafael J. Wysocki wrote:
> >>> On Thu, Apr 25, 2024 at 2:36 PM Rafael J. Wysocki <rafael@...nel.org> wrote:
> >>>>
> >>>> Hi Lukasz,
> >>>>
> >>>> On Thu, Apr 25, 2024 at 12:02 PM Lukasz Luba <lukasz.luba@....com> wrote:
> >>>>>
> >>>>> Hi Rafael,
> >>>>>
> >>>>> On 4/23/24 19:00, Rafael J. Wysocki wrote:
> >>>>>> From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> >>>>>>
> >>>>>> If cdev_dt_seq_show() runs before the first state transition of a cooling
> >>>>>> device, it will not print any state residency information for it, even
> >>>>>> though it might be reasonably expected to print residency information for
> >>>>>> the initial state of the cooling device.
> >>>>>>
> >>>>>> For this reason, rearrange the code to get the initial state of a cooling
> >>>>>> device at the registration time and pass it to thermal_debug_cdev_add(),
> >>>>>> so that the latter can create a duration record for that state which will
> >>>>>> allow cdev_dt_seq_show() to print its residency information.
> >>>>>>
> >>>>>> Fixes: 755113d76786 ("thermal/debugfs: Add thermal cooling device debugfs information")
> >>>>>> Reported-by: Lukasz Luba <lukasz.luba@....com>
> >>>>>> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> >>>>>> ---
> >>>>>>     drivers/thermal/thermal_core.c    |    9 +++++++--
> >>>>>>     drivers/thermal/thermal_debugfs.c |   12 ++++++++++--
> >>>>>>     drivers/thermal/thermal_debugfs.h |    4 ++--
> >>>>>>     3 files changed, 19 insertions(+), 6 deletions(-)
> >>>>>>
> >>>>>
> >>>>> I'm trying to test it on my board and do the review, but faced issue.
> >>>>> For some reason I couldn't apply that patch on the latest bleeding-edge
> >>>>> branch.
> >>>>> Could you help me in this please? Is there something missing in the
> >>>>> patch set (like one more fist patch)?
> >>>>
> >>>> I messed up the ordering of patches (patch [2/3] should be the last
> >>>> one in the series) and on top of that, you'll need a small rebase on
> >>>> that patch.
> >>>>
> >>>> Sorry about this, I'll send a v2.
> >>>
> >>> Actually, the ordering was OK, but the rebase of the second patch is
> >>> still needed.  I'll send a v2.
> >>
> >> Thanks, I've seen it. That v2 applies smoothly and runs on the board.
> >> I'll test it and review.
> >
> > Thank you!
> >
> > Please also see
> >
> > https://lore.kernel.org/linux-pm/12427744.O9o76ZdvQC@kreacher/
> >
> > which is actually more urgent because the fixes there address more
> > serious issues (I would even consider them as 6.9-rc material).
>
> Yes, I've read that patches' headers and glanced through the code.
> I'll do the review & testing on them as well today.

Thanks, much appreciated!