Hi Jonathan,all
Are there any items that need to sync during next Tue's LOD meeting?
Thanks
Joyce
> On 26 Mar 2025, at 08:00, linaro-open-discussions-request(a)op-lists.linaro.org wrote:
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> Today's Topics:
>
> 1. About the Device tree handling multiple threads in ARM cpu node LOD discussion(Linaro Open Discussion)
> (Joyce Qi)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Tue, 25 Mar 2025 19:24:43 +0800
> From: Joyce Qi <joyce.qi(a)linaro.org>
> Subject: [Linaro-open-discussions] About the Device tree handling
> multiple threads in ARM cpu node LOD discussion(Linaro Open
> Discussion)
> To: Jonathan Cameron <jonathan.cameron(a)huawei.com>
> Cc: Joyce Qi <joyce.qi(a)linaro.org>,
> linaro-open-discussions(a)op-lists.linaro.org, Lorenzo Pieralisi
> <lorenzo.pieralisi(a)linaro.org>, James Morse <james.morse(a)arm.com>, Rob
> Herring <robh(a)kernel.org>, Mark Rutland <mark.rutland(a)arm.com>,
> Alireza Sanaee <alireza.sanaee(a)huawei.com>
> Message-ID: <EB0D6409-56E1-4749-9BCA-26D207EB5DE7(a)linaro.org>
> Content-Type: text/plain; charset=utf-8
>
> Hi Mark, Rob,
>
> https://lore.kernel.org/linux-arm-kernel/20250110161057.445-1-alireza.sanae… to the LoD discussion email list!
> Maybe you have missed the formal email since the title is not so clear:)
>
> Jonathan from Huawei wants to sync the about how to do device tree representation of multi thread cores and resulting shared L1 caches
> In this email list.
>
> Can we discuss here to have a unified solution?
>
>
> https://lore.kernel.org/linux-arm-kernel/20250110161057.445-1-alireza.sanae…
>
>
> Great thanks:)
> Joyce
>
>
>
>
>> On 21 Feb 2025, at 18:07, Jonathan Cameron <jonathan.cameron(a)huawei.com> wrote:
>>
>>
>> Hi Joyce,
>>
>> I'll be in Shenzhen next week but should be able to dial in subject to
>> overcoming a slightly different network.
>>
>> If we can poke the following disconnect that would be very helpful
>> - if it happens on list rather than needing to be discussed on the call
>> that's absolutely fine.
>>
>> It's a difference of opinion between Mark Rutland and Rob Herring
>> (both ARM) about how to do device tree representation of multi thread
>> cores and resulting shared L1 caches. We mostly care about this because
>> we'd like to maintain same level of support in QEMU for ACPI (which has
>> always handled this case) and DT.
>>
>> This was try number 1 based on advice from Rob was to use multiple reg
>> entries in a single cpu node (how the DT spec currently specifies it
>> based on ancient power PC roots)
>>
>> https://lore.kernel.org/linux-arm-kernel/20250110161057.445-1-alireza.sanae…
>> Mark suggested that we just do out of CPU node description as is done for every
>> other level of cache because of the complexity of phandles pointing to the
>> node.
>>
>> Proposal of out of CPU node description. Rob not happy with this one.
>> https://lore.kernel.org/all/20250129164855.676-1-alireza.sanaee@huawei.com/
>> https://lore.kernel.org/all/20250203120527.3534-1-alireza.sanaee@huawei.com/
>>
>> Whilst I'm fairly sure Mark's concerns about references to the CPU node can
>> be resolved with a few minor tweaks (a few properties may become arrays that
>> are index rather than single element) we'd really like to have the two
>> experts engaged in the same thread as so far it's been a case of alternate
>> responses.
>>
>> The other topic that is in my pile is the cache flushing by PA range work.
>> I'm going to be working with our HQ team to ensure the design we put out
>> for that is general enough over the next 2 weeks so we should have something
>> to share after that. The remaining questions prior to posting an RFC are
>> all low level detail things that I don't think would benefit from a discussion
>> until we've shown the code.
>>
>> Final potential topic is MPAM. Particularly if there is anything specific
>> we can do to help with upstreaming.
>>
>> Jonathan
>>
>>
>> Joyce Qi <joyce.qi(a)linaro.org> wrote:
>>
>>> Hi Jonathan, all,
>>>
>>> Happy New Year to all!
>>>
>>> Do we have any topic to sync next week?
>>>
>>> Thanks:)
>>> Joyce
>>>
>>>
>>>
>>>
>>>> On 27 Nov 2024, at 08:00, linaro-open-discussions-request(a)op-lists.linaro.org wrote:
>>>>
>>>> Send Linaro-open-discussions mailing list submissions to
>>>> linaro-open-discussions(a)op-lists.linaro.org
>>>>
>>>> To subscribe or unsubscribe via email, send a message with subject or
>>>> body 'help' to
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>>>> When replying, please edit your Subject line so it is more specific
>>>> than "Re: Contents of Linaro-open-discussions digest..."
>>>>
>>>> Today's Topics:
>>>>
>>>> 1. Re: Flush by PA range Designs. (was Re: Linaro-open-discussions Digest, Vol 38, Issue 14)
>>>> (Joyce Qi)
>>>>
>>>>
>>>> ----------------------------------------------------------------------
>>>>
>>>> Message: 1
>>>> Date: Tue, 26 Nov 2024 18:36:22 +0800
>>>> From: Joyce Qi <joyce.qi(a)linaro.org>
>>>> Subject: [Linaro-open-discussions] Re: Flush by PA range Designs.
>>>> (was Re: Linaro-open-discussions Digest, Vol 38, Issue 14)
>>>> To: James Morse <james.morse(a)arm.com>
>>>> Cc: Jonathan Cameron <Jonathan.Cameron(a)Huawei.com>, James Morse via
>>>> Linaro-open-discussions <linaro-open-discussions(a)op-lists.linaro.org>,
>>>> linuxarm(a)huawei.com, zengheng4(a)huawei.com, wangyushan12(a)huawei.com,
>>>> Dave Martin <Dave.Martin(a)arm.com>
>>>> Message-ID: <5BF890F5-CE52-4682-AFE6-9FBDE56F2247(a)linaro.org>
>>>> Content-Type: text/plain; charset=utf-8
>>>>
>>>> Hi all,
>>>>
>>>> Will cancel today’s meeting since no special topic today, welcome to contact with when needed.
>>>>
>>>> Thanks
>>>> Joyce
>>>>
>>>>> On 25 Nov 2024, at 21:01, Joyce Qi <joyce.qi(a)linaro.org> wrote:
>>>>>
>>>>> Hi Jonathan,
>>>>>
>>>>> Would you like to continue the MPAM, Flush by PA range Designs or any other topics during tomorrow’s LOD meeting?
>>>>>
>>>>> Thanks
>>>>> Joyce
>>>>>
>>>>>
>>>>>> On 24 Oct 2024, at 00:14, James Morse <james.morse(a)arm.com> wrote:
>>>>>>
>>>>>> Hi guys,
>>>>>>
>>>>>> (CC: +Dave Martin)
>>>>>>
>>>>>> On 10/21/24 15:01, Joyce Qi wrote:
>>>>>>>> On 21 Oct 2024, at 20:50, James Morse <james.morse(a)arm.com> wrote:
>>>>>>>> On 21/10/2024 11:00, Joyce Qi via Linaro-open-discussions wrote:
>>>>>>>>> Thanks a lot for the detailed description and document sharing.
>>>>>>>>> I have uploaded the MPAM materials to the LOD Confluence.
>>>>>>>>>
>>>>>>>>> https://linaro.atlassian.net/wiki/spaces/LOD/overview
>>>>>>
>>>>>>>>> Are you available to join tomorrow’s LoD meeting for the MPAM topics ?
>>>>>>
>>>>>> The code already published for something like the intPARTID proposal is here:
>>>>>> https://git.gitlab.arm.com/linux-arm/linux-dm/-/commits/mpam/partid-pmg-rem…
>>>>>>
>>>>>> The aim was to keep it within the MPAM driver, initially based on some static configuration to prove
>>>>>> its useful before making it more dynamic, probably a mount option.
>>>>>>
>>>>>>
>>>>>> Thanks,
>>>>>>
>>>>>> James
>>>>>
>>>>
>>>>
>>>> ------------------------------
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>>>> End of Linaro-open-discussions Digest, Vol 50, Issue 1
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>>>
>>
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