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

ACPI Generic Initiator support status and potential additions

by Jonathan Cameron

Hi All, This one made it onto the list of topics to discuss (now marked as no need to discuss). I've been meaning to give a status update by email including what is outstanding here. Please let me know if this fails to cover some aspect of interest. Background: https://github.com/hisilicon/acpi-numa-whitepaper/releases/tag/v0.93 chapter 3. Generic initiators are a concept in ACPI 6.3 (sec 5.2.16.6) to plug a hole in the definition of proximity domains. Proximity domains in ACPI (NUMA nodes in kernel) are defined by entries in SRAT table. There are a whole range of different types of SRAT entry but before ACPI 6.3 this more or less in practice meant that a proximity domain only existed if it contained either (or both) memory and CPUs. Other initiators of memory transactions such as network cards can be assigned to an existing proximity domain via _PXM in ACPI DSDT. This restricted them to sharing a domain with either memory or processors. That doesn't always reflect system architecture, particularly with the addition of richer descriptions of access characteristics (latency / bandwidth) brought in by HMAT. Hence Generic Initiator domains to allow you to specify a proximity domain with some other type of device in it (such as a network card) and get all of the descriptive capability available for CPU / memory nodes. Note that this was brought in prior to CXL becoming public but 1.1 CXL spec states that initiators on CXL should be described using Generic Initiator nodes. This should accelerate the number of users of this feature considerably. It is also useful in some existing systems. What support was needed in kernel: 1) Parsing of the SRAT Generic Initiator Affinity Structure 2) Instantiating the NUMA nodes that map to the GI PXM nodes to ensure stuff like fallback lists for memory allocation work as normal. 3) Richer use of HMAT access characteristics to differentiate nearest CPU to memory from nearest initiator to memory. 4) PXM assignment from the SRAT record rather than _PXM (not yet done). 5) PCI PXM assignment (not yet done) Status: The kernel patches sat on the list (with rebases) for well over a year failing to get the architecture review needed (as there was significant risk of breakage in both ARM64 and x86). It was to break this blockage that we were interested in an open discussion on this. However, they did recently get x86 review this and Rafael queued them for 5.10 (now merged) The PCI PXM issue has been long standing due to some buggy firmware on certain X86 boards and the need for a clarification in the ACPI spec (added in 6.3). To make this safe, needed to ensure that NUMA nodes on ACPI systems can only be instantiated during the main parse of SRAT. https://lore.kernel.org/linux-mm/20200818142430.1156547-1-Jonathan.Cameron@… That fix is now in place, and we'll resend the PCI fix shortly. Note it may be "interesting" to support nodes from CXL CDAT tables at runtime but that is another topic. ( https://uefi.org/node/4093 https://lore.kernel.org/linux-cxl/20201102183428.00005f4f@Huawei.com/T/#m52… ) For a Generic Initiator Nodes, there are two ways a device an be assigned to the proximity domain. Conventional _PXM in DSDT can be used and that is now supported. The SRAT entry itself also contains an address (PCI seg + BDF or Platform UID / HID based). There is no obligation to provide both. The SRAT based method will require some level of alternative infrastructure to that used for _PXM. We may look at this at some stage. So a few outstanding things but probably not worth discussing on a call at this stage unless anyone is seeing problems with the stuff already merged. Thanks, Jonathan

4 years, 9 months

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Re: [Linaro-open-discussions] Linaro : Meeting : Linux Kernel Discussion : Wednesday 2.00 pm GMT

by Shameerali Kolothum Thodi

> -----Original Message----- > From: Linaro-open-discussions > [mailto:linaro-open-discussions-bounces@op-lists.linaro.org] On Behalf Of > Zhangfei Gao via Linaro-open-discussions > Sent: 03 November 2020 13:39 > To: Mike Holmes <mike.holmes(a)linaro.org>; > linaro-open-discussions(a)op-lists.linaro.org; Wangzhou (B) > <wangzhou1(a)hisilicon.com>; Guodong Xu <guodong.xu(a)linaro.org> > Subject: Re: [Linaro-open-discussions] Linaro : Meeting : Linux Kernel > Discussion : Wednesday 2.00 pm GMT > > > > On 2020/11/2 下午5:47, Mike Holmes via Linaro-open-discussions wrote: > > Topic: Linaro Open Discussions [1] - Kernel related > > Time: Nov 4, 2020 02:00 PM London > > ------ > > Agenda [2] > > > > - Hanjun/Shameer - IORT reserved memory support And for this topic, a kernel RFC has already been sent out, https://lore.kernel.org/linux-iommu/20201027112646.44680-4-shameerali.kolot… and a related acpica pull req can be found here, https://github.com/acpica/acpica/pull/638 Thanks, Shameer > > - Zhangfei/Wangzhou - SVA support for SMMU stall mode > Here are some history info regarding this topic > https://docs.qq.com/doc/DRXVJY1pNYXZFbVBY > > - Hanjun - Uncore DVFS and how to support it (needs spec update, > either > > ARM specs or ACPI) > > > > > > [1] Linaro Open Discussions Home > > <https://collaborate.linaro.org/display/LOD/Linaro+Open+Discussions+Ho > > me> > > For all open meeting schedules > > [2] 2020-11-04 Proposed Meeting Agenda > > <https://collaborate.linaro.org/display/LOD/2020-11-04+Proposed+Meetin > > g+Meeting+agenda> > > > > ---------- > > Join Zoom Meeting > > https://linaro-org.zoom.us/j/98027304997 > > > > > > Thanks > -- > Linaro-open-discussions mailing list > https://collaborate.linaro.org/display/LOD/Linaro+Open+Discussions+Home > https://op-lists.linaro.org/mailman/listinfo/linaro-open-discussions

4 years, 9 months

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Re: [Linaro-open-discussions] Linaro : Meeting : Linux Kernel Discussion : Wednesday 2.00 pm GMT

by Zhangfei Gao

On 2020/11/2 下午5:47, Mike Holmes via Linaro-open-discussions wrote: > Topic: Linaro Open Discussions [1] - Kernel related > Time: Nov 4, 2020 02:00 PM London > ------ > Agenda [2] > > - Hanjun/Shameer - IORT reserved memory support > - Zhangfei/Wangzhou - SVA support for SMMU stall mode Here are some history info regarding this topic https://docs.qq.com/doc/DRXVJY1pNYXZFbVBY > - Hanjun - Uncore DVFS and how to support it (needs spec update, either > ARM specs or ACPI) > > > [1] Linaro Open Discussions Home > <https://collaborate.linaro.org/display/LOD/Linaro+Open+Discussions+Home> > For all open meeting schedules > [2] 2020-11-04 Proposed Meeting Agenda > <https://collaborate.linaro.org/display/LOD/2020-11-04+Proposed+Meeting+Meet…> > > ---------- > Join Zoom Meeting > https://linaro-org.zoom.us/j/98027304997 > > Thanks

4 years, 9 months

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Linaro : Meeting : Linux Kernel Discussion : Wednesday 2.00 pm GMT

by Mike Holmes

Topic: Linaro Open Discussions [1] - Kernel related Time: Nov 4, 2020 02:00 PM London ------ Agenda [2] - Hanjun/Shameer - IORT reserved memory support - Zhangfei/Wangzhou - SVA support for SMMU stall mode - Hanjun - Uncore DVFS and how to support it (needs spec update, either ARM specs or ACPI) [1] Linaro Open Discussions Home <https://collaborate.linaro.org/display/LOD/Linaro+Open+Discussions+Home> For all open meeting schedules [2] 2020-11-04 Proposed Meeting Agenda <https://collaborate.linaro.org/display/LOD/2020-11-04+Proposed+Meeting+Meet…> ---------- Join Zoom Meeting https://linaro-org.zoom.us/j/98027304997 Meeting ID: 980 2730 4997 One tap mobile +16699009128,,98027304997# US (San Jose) +12532158782,,98027304997# US (Tacoma) Dial by your location +1 669 900 9128 US (San Jose) +1 253 215 8782 US (Tacoma) +1 301 715 8592 US (Germantown) +1 312 626 6799 US (Chicago) +1 346 248 7799 US (Houston) +1 646 558 8656 US (New York) 888 788 0099 US Toll-free 877 853 5247 US Toll-free Meeting ID: 980 2730 4997 Find your local number: https://linaro-org.zoom.us/u/aehAhwidV2 -- Mike Holmes | Director, Foundation Technologies, Linaro Mike.Holmes(a)linaro.org <mike.holmes(a)linaro.org> "Work should be fun and collaborative, the rest follows"

4 years, 9 months

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Extend TF-A with PSCI OS-initiated mode

by Ulf Hansson

Hi all, In the Linux kernel v5.6, we introduced the basic support for PSCI OS-initiated mode. Linaro is still working on evolving the support, step by step. Additionally, we are helping some of our members with corresponding SoC deployment, which is planned to continue for a while. Basically, the PSCI OS-initiated mode allows Linux to be in charge of idlestate decisions for a group of CPUs (aka CPU cluster), which may share idlestates. In some cases this enables improvements in regards to performance/energy, but could also be used to help manage resources that may share power-/clock-domains with CPUs. Moving forward, we are now planning to extend the corresponding PSCI implementation in the Trusted Firmware-A (TF-A) with the OS-initiated mode, together with our members and member engineers. Currently, only the default PSCI platform-coordinated mode is supported by the TF-A. We seek for additional collaborations and input to the new project! Please get in touch, if you have any feedback and/or find this project interesting. Finally, a kickoff meeting is about to be scheduled and held within a few weeks. Let me know if you want to join the discussions. Kind regards Ulf Hansson, Linaro Kernel Working Group

4 years, 9 months

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Re: [Linaro-open-discussions] Nov 4th - topics list proposal

by Hanjun Guo

Hi Lorenzo, On 2020/10/22 1:26, Lorenzo Pieralisi via Linaro-open-discussions wrote: > Hi all, > > according to the topics posted previously on the list, I suggest we > tackle the following ones on Nov 4th (all topics posted are interesting > but some require some time to elaborate following KVM forum next week): > > - Hanjun/Shameer - IORT reserved memory support > - Zhangfei/Wangzhou - SVA support for SMMU stall mode > - Hanjun - Uncore DVFS and how to support it (needs spec update, either > ARM specs or ACPI) > > On MPAM - I don't think we require a topic for status update - technical > discussions are already on ML and I don't think there is much to be > done to speed up upstreaming other than following the usual process. > > Please let me know your thoughts. Is fine to me to remove the MPAM topic. Thanks Hanjun

4 years, 9 months

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Re: [Linaro-open-discussions] Nov 4th - topics list proposal

by Vincent Guittot

On Wed, 21 Oct 2020 at 19:26, Lorenzo Pieralisi via Linaro-open-discussions <linaro-open-discussions(a)op-lists.linaro.org> wrote: > > Hi all, > > according to the topics posted previously on the list, I suggest we > tackle the following ones on Nov 4th (all topics posted are interesting > but some require some time to elaborate following KVM forum next week): > > - Hanjun/Shameer - IORT reserved memory support > - Zhangfei/Wangzhou - SVA support for SMMU stall mode > - Hanjun - Uncore DVFS and how to support it (needs spec update, either > ARM specs or ACPI) > > On MPAM - I don't think we require a topic for status update - technical > discussions are already on ML and I don't think there is much to be > done to speed up upstreaming other than following the usual process. > > Please let me know your thoughts. Your proposal looks good to me Limiting to 3 topics for an hour meeting is probably a good thing to allow discussion > > Thank you very much. > > Lorenzo > -- > Linaro-open-discussions mailing list > https://collaborate.linaro.org/display/LOD/Linaro+Open+Discussions+Home > https://op-lists.linaro.org/mailman/listinfo/linaro-open-discussions

4 years, 10 months

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Re: [Linaro-open-discussions] Nov 4th - topics list proposal

by Mike Holmes

I have updated the agenda to reflect the topics discussion https://collaborate.linaro.org/display/LOD/2020-11-04+Proposed+Meeting+Meet… On Thu, Oct 22, 2020 at 6:45 AM Hanjun Guo via Linaro-open-discussions < linaro-open-discussions(a)op-lists.linaro.org> wrote: > Hi Lorenzo, > > On 2020/10/22 1:26, Lorenzo Pieralisi via Linaro-open-discussions wrote: > > Hi all, > > > > according to the topics posted previously on the list, I suggest we > > tackle the following ones on Nov 4th (all topics posted are interesting > > but some require some time to elaborate following KVM forum next week): > > > > - Hanjun/Shameer - IORT reserved memory support > > - Zhangfei/Wangzhou - SVA support for SMMU stall mode > > - Hanjun - Uncore DVFS and how to support it (needs spec update, either > > ARM specs or ACPI) > > > > On MPAM - I don't think we require a topic for status update - technical > > discussions are already on ML and I don't think there is much to be > > done to speed up upstreaming other than following the usual process. > > > > Please let me know your thoughts. > > Is fine to me to remove the MPAM topic. > > Thanks > Hanjun > -- > Linaro-open-discussions mailing list > https://collaborate.linaro.org/display/LOD/Linaro+Open+Discussions+Home > https://op-lists.linaro.org/mailman/listinfo/linaro-open-discussions > -- Mike Holmes | Director, Foundation Technologies, Linaro Mike.Holmes(a)linaro.org <mike.holmes(a)linaro.org> "Work should be fun and collaborative, the rest follows"

4 years, 10 months

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Fwd: Linaro OP-TEE Contributions meeting October 2020

by Ruchika Gupta

Hi, For those who are interested, we have a LOC (Linaro OP-TEE Contribution) Monthly Meeting scheduled for October 28th @ 16.00 (UTC+1). Regards, Ruchika ---------- Forwarded message --------- From: Joakim Bech via OP-TEE <op-tee(a)lists.trustedfirmware.org> Date: Tue, 20 Oct 2020 at 17:13 Subject: Linaro OP-TEE Contributions meeting October 2020 To: <op-tee(a)lists.trustedfirmware.org>, Ilias Apalodimas < ilias.apalodimas(a)linaro.org> Hi, LOC monthly meeting is planned to take place October 28th @ 16.00 (UTC+1). Connection details can be found in the meeting notes document (link below). Ilias and Jens will give an introduction to the secure partitions and StandaloneMM parts in OP-TEE. Other than that feel free to suggest topics you'd like to discuss (by replying to this email or write it directly in the meeting notes). Note that it's UTC+1 since we're moving to winter time in Sweden in a couple of days from now (previous LOC meetings have been UTC+2). Meeting details: --------------- Date/time: Wednesday October 28th(a)16.00 (UTC+1) https://everytimezone.com/s/9bfdb976 Invitation/connection details: In the meeting notes Meeting notes: http://bit.ly/loc-notes Project page: https://www.linaro.org/projects/#LOC Regards, Joakim on behalf of the Linaro OP-TEE team

4 years, 10 months

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Nov 4th - topics list proposal

by Lorenzo Pieralisi

Hi all, according to the topics posted previously on the list, I suggest we tackle the following ones on Nov 4th (all topics posted are interesting but some require some time to elaborate following KVM forum next week): - Hanjun/Shameer - IORT reserved memory support - Zhangfei/Wangzhou - SVA support for SMMU stall mode - Hanjun - Uncore DVFS and how to support it (needs spec update, either ARM specs or ACPI) On MPAM - I don't think we require a topic for status update - technical discussions are already on ML and I don't think there is much to be done to speed up upstreaming other than following the usual process. Please let me know your thoughts. Thank you very much. Lorenzo

4 years, 10 months

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