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

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Message-ID: <ce95f95d-c004-4814-bdb0-d230731084d3@arm.com>
Date: Thu, 25 Apr 2024 19:55:31 +0100
From: Lukasz Luba <lukasz.luba@....com>
To: "Rafael J. Wysocki" <rafael@...nel.org>
Cc: "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 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.