Linaro-open-discussions February 2025

linaro-open-discussions@op-lists.linaro.org

2 participants
3 discussions

Re: About next week LOD meeting topic collection

by Joyce Qi

Hi Jonathan， Welcome to China and thanks for the detailed update！ @Rob，Mark Welcome to join LOD discussion！ For Jonathan’s first topics： How to do device tree representation of multi thread cores and resulting shared L1 caches. Would you like to communicate in this email list or do we need a LOD meeting to reach an agreement? @James， For the MPAM upstream，any help needed for the upstream from Huawei or Linaro？ 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 >>> linaro-open-discussions-request(a)op-lists.linaro.org >>> >>> You can reach the person managing the list at >>> linaro-open-discussions-owner(a)op-lists.linaro.org >>> >>> 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 >>>> >>> >>> >>> ------------------------------ >>> >>> Subject: Digest Footer >>> >>> Linaro-open-discussions mailing list -- linaro-open-discussions(a)op-lists.linaro.org >>> To unsubscribe send an email to linaro-open-discussions-leave(a)op-lists.linaro.org >>> >>> >>> ------------------------------ >>> >>> End of Linaro-open-discussions Digest, Vol 50, Issue 1 >>> ****************************************************** >> >

1 week, 1 day

Linaro OP-TEE Contribution, LOC, monthly meeting February 25

by Jens Wiklander

Hi, Tomorrow, Tuesday, it's time for another LOC monthly meeting. For time and connection details see the calendar at https://www.trustedfirmware.org/meetings/ I recently posted a new version of the Restricted DMA-buf patch set [1], and there's also an ongoing discussion that already started on the previous version of the patch set [2]. We're discussing whether the restricted DMA-bufs should be allocated from DMA heaps or the TEE subsystem. Both approaches work, but we need to decide on one for the patch set to move forward. [1] https://lore.kernel.org/lkml/20250218143527.1236668-1-jens.wiklander@linaro… [2] https://lore.kernel.org/lkml/20241217100809.3962439-1-jens.wiklander@linaro… Are there any other topics? Cheers, Jens

1 week, 2 days

About next week LOD meeting topic collection

by Joyce Qi

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 > linaro-open-discussions-request(a)op-lists.linaro.org > > You can reach the person managing the list at > linaro-open-discussions-owner(a)op-lists.linaro.org > > 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 >> > > > ------------------------------ > > Subject: Digest Footer > > Linaro-open-discussions mailing list -- linaro-open-discussions(a)op-lists.linaro.org > To unsubscribe send an email to linaro-open-discussions-leave(a)op-lists.linaro.org > > > ------------------------------ > > End of Linaro-open-discussions Digest, Vol 50, Issue 1 > ******************************************************

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Linaro-open-discussions February 2025