linux-kernel - Re: [PATCH 0/2] platform/mellanox: mlxbf-pmc: Fix module loading

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Date: Mon, 26 Feb 2024 12:05:57 -0500
From: Luiz Capitulino <luizcap@...hat.com>
To: Hans de Goede <hdegoede@...hat.com>,
 Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
Cc: shravankr@...dia.com, davthompson@...dia.com, ndalvi@...hat.com,
 LKML <linux-kernel@...r.kernel.org>, platform-driver-x86@...r.kernel.org
Subject: Re: [PATCH 0/2] platform/mellanox: mlxbf-pmc: Fix module loading

On 2024-02-26 11:57, Hans de Goede wrote:
> Hi Luiz,
> 
> On 2/26/24 17:10, Luiz Capitulino wrote:
>> On 2024-02-26 11:04, Ilpo Järvinen wrote:
>>> On Mon, 26 Feb 2024, Luiz Capitulino wrote:
>>>
>>>> On 2024-02-26 08:27, Ilpo Järvinen wrote:
>>>>> On Thu, 22 Feb 2024 15:57:28 -0500, Luiz Capitulino wrote:
>>>>>
>>>>>> The mlxbf-pmc driver fails to load when the firmware reports a new but not
>>>>>> yet implemented performance block. I can reproduce this today with a
>>>>>> Bluefield-3 card and UEFI version 4.6.0-18-g7d063bb-BId13035, since this
>>>>>> reports the new clock_measure performance block.
>>>>>>
>>>>>> This[1] patch from Shravan implements the clock_measure support and will
>>>>>> solve the issue. But this series avoids the situation by ignoring and
>>>>>> logging unsupported performance blocks.
>>>>>>
>>>>>> [...]
>>>>>
>>>>>
>>>>> Thank you for your contribution, it has been applied to my local
>>>>> review-ilpo branch. Note it will show up in the public
>>>>> platform-drivers-x86/review-ilpo branch only once I've pushed my
>>>>> local branch there, which might take a while.
>>>>
>>>> Thank you Ilpo and thanks Hans for the review.
>>>>
>>>> The only detail is that we probably want this merged for 6.8 since
>>>> the driver doesn't currently load with the configuration mentioned above.
>>>
>>> Oh, sorry, I missed the mention in the coverletter.
>>>
>>> So you'd want I drop these from review-ilpo branch as there they end
>>> up into for-next branch, and they should go through Hans instead who
>>> handles fixes branch for this cycle?
>>
>> If that's the path to get this series merged for this cycle then yes,
>> but let's see if Hans agrees (sorry that I didn't know this before
>> posting).
> 
> Hmm, new hw enablement typically goes through -next and not to
> the current fixes branch. And AFAICT this is new hw enablement,
> not a regression / bug-fix.
> 
> Is there any special reason why this needs to be in 6.8 ?

Since the new firmware feature is causing the driver not to load,
I'm seeing this more as a bug than new enablement. But it's fine
with me if you decide on not having them on 6.8.

> For RHEL kernels you can cherry-pick patches from -next
> as necessary.

I know :)

>> One additional detail is that this series is on top of linux-next, which
>> has two additional mlxbf-pmc changes:
>>
>> * https://lore.kernel.org/lkml/39be055af3506ce6f843d11e45d71620f2a96e26.1707808180.git.shravankr@nvidia.com/
>> * https://lore.kernel.org/lkml/d8548c70339a29258a906b2b518e5c48f669795c.1707808180.git.shravankr@nvidia.com/
> 
> Hmm, those are not small patches, any other reason
> why this really should go to -next IMHO.

OK.

- Luiz