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Date:   Wed, 13 Jan 2021 21:21:38 -0800 (PST)
From:   Palmer Dabbelt <palmer@...belt.com>
To:     atishp@...shpatra.org
CC:     linux-kernel@...r.kernel.org, rafael@...nel.org,
        catalin.marinas@....com, Jonathan.Cameron@...wei.com,
        Atish Patra <Atish.Patra@....com>,
        linux-riscv@...ts.infradead.org, will@...nel.org, ardb@...nel.org,
        linux-arch@...r.kernel.org, liuzhengyuan@...kylinos.cn,
        bhe@...hat.com, anup@...infault.org, daniel.lezcano@...aro.org,
        steven.price@....com, greentime.hu@...ive.com,
        aou@...s.berkeley.edu, Arnd Bergmann <arnd@...db.de>,
        anshuman.khandual@....com,
        Paul Walmsley <paul.walmsley@...ive.com>,
        linux-arm-kernel@...ts.infradead.org,
        Greg KH <gregkh@...uxfoundation.org>,
        akpm@...ux-foundation.org, rppt@...nel.org
Subject:     Re: [PATCH v5 0/5] Unify NUMA implementation between ARM64 & RISC-V

On Mon, 11 Jan 2021 11:31:11 PST (-0800), atishp@...shpatra.org wrote:
> On Sat, Jan 9, 2021 at 12:51 PM Palmer Dabbelt <palmer@...belt.com> wrote:
>>
>> On Sun, 13 Dec 2020 17:02:19 PST (-0800), atishp@...shpatra.org wrote:
>> > On Wed, Nov 18, 2020 at 4:39 PM Atish Patra <atish.patra@....com> wrote:
>> >>
>> >> This series attempts to move the ARM64 numa implementation to common
>> >> code so that RISC-V can leverage that as well instead of reimplementing
>> >> it again.
>> >>
>> >> RISC-V specific bits are based on initial work done by Greentime Hu [1] but
>> >> modified to reuse the common implementation to avoid duplication.
>> >>
>> >> [1] https://lkml.org/lkml/2020/1/10/233
>> >>
>> >> This series has been tested on qemu with numa enabled for both RISC-V & ARM64.
>> >> It would be great if somebody can test it on numa capable ARM64 hardware platforms.
>> >> This patch series doesn't modify the maintainers list for the common code (arch_numa)
>> >> as I am not sure if somebody from ARM64 community or Greg should take up the
>> >> maintainership. Ganapatrao was the original author of the arm64 version.
>> >> I would be happy to update that in the next revision once it is decided.
>> >>
>> >> # numactl --hardware
>> >> available: 2 nodes (0-1)
>> >> node 0 cpus: 0 1 2 3
>> >> node 0 size: 486 MB
>> >> node 0 free: 470 MB
>> >> node 1 cpus: 4 5 6 7
>> >> node 1 size: 424 MB
>> >> node 1 free: 408 MB
>> >> node distances:
>> >> node   0   1
>> >>   0:  10  20
>> >>   1:  20  10
>> >> # numactl -show
>> >> policy: default
>> >> preferred node: current
>> >> physcpubind: 0 1 2 3 4 5 6 7
>> >> cpubind: 0 1
>> >> nodebind: 0 1
>> >> membind: 0 1
>> >>
>> >> The patches are also available at
>> >> https://github.com/atishp04/linux/tree/5.11_numa_unified_v5
>> >>
>> >> For RISC-V, the following qemu series is a pre-requisite(already available in upstream)
>> >> https://patchwork.kernel.org/project/qemu-devel/list/?series=303313
>> >>
>> >> Testing:
>> >> RISC-V:
>> >> Tested in Qemu and 2 socket OmniXtend FPGA.
>> >>
>> >> ARM64:
>> >> 2 socket kunpeng920 (4 nodes around 250G a node)
>> >> Tested-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
>> >>
>> >> Changes from v4->v5:
>> >> 1. Added by Acked-by & Reviewed-by tags.
>> >> 2. Swapped patch 1 & 2 in v4 version.
>> >>
>> >> Changes from v3->v4:
>> >> 1. Removed redundant duplicate header.
>> >> 2. Added Reviewed-by tags.
>> >>
>> >> Changes from v2->v3:
>> >> 1. Added Acked-by/Reviewed-by tags.
>> >> 2. Replaced asm/acpi.h with linux/acpi.h
>> >> 3. Defined arch_acpi_numa_init as static.
>> >>
>> >> Changes from v1->v2:
>> >> 1. Replaced ARM64 specific compile time protection with ACPI specific ones.
>> >> 2. Dropped common pcibus_to_node changes. Added required changes in RISC-V.
>> >> 3. Fixed few typos.
>> >>
>> >> Atish Patra (4):
>> >> arm64, numa: Change the numa init functions name to be generic
>> >> numa: Move numa implementation to common code
>> >> riscv: Separate memory init from paging init
>> >> riscv: Add numa support for riscv64 platform
>> >>
>> >> Greentime Hu (1):
>> >> riscv: Add support pte_protnone and pmd_protnone if
>> >> CONFIG_NUMA_BALANCING
>> >>
>> >> arch/arm64/Kconfig                            |  1 +
>> >> arch/arm64/include/asm/numa.h                 | 48 +----------------
>> >> arch/arm64/kernel/acpi_numa.c                 | 12 -----
>> >> arch/arm64/mm/Makefile                        |  1 -
>> >> arch/arm64/mm/init.c                          |  4 +-
>> >> arch/riscv/Kconfig                            | 31 ++++++++++-
>> >> arch/riscv/include/asm/mmzone.h               | 13 +++++
>> >> arch/riscv/include/asm/numa.h                 |  8 +++
>> >> arch/riscv/include/asm/pci.h                  | 14 +++++
>> >> arch/riscv/include/asm/pgtable.h              | 21 ++++++++
>> >> arch/riscv/kernel/setup.c                     | 11 +++-
>> >> arch/riscv/kernel/smpboot.c                   | 12 ++++-
>> >> arch/riscv/mm/init.c                          | 10 +++-
>> >> drivers/base/Kconfig                          |  6 +++
>> >> drivers/base/Makefile                         |  1 +
>> >> .../mm/numa.c => drivers/base/arch_numa.c     | 27 ++++++++--
>> >> include/asm-generic/numa.h                    | 52 +++++++++++++++++++
>> >> 17 files changed, 200 insertions(+), 72 deletions(-)
>> >> create mode 100644 arch/riscv/include/asm/mmzone.h
>> >> create mode 100644 arch/riscv/include/asm/numa.h
>> >> rename arch/arm64/mm/numa.c => drivers/base/arch_numa.c (96%)
>> >> create mode 100644 include/asm-generic/numa.h
>> >>
>> >> --
>> >> 2.25.1
>> >>
>> >>
>> >> _______________________________________________
>> >> linux-riscv mailing list
>> >> linux-riscv@...ts.infradead.org
>> >> http://lists.infradead.org/mailman/listinfo/linux-riscv
>> >
>> > Hey Palmer,
>> > I did not see this series in for-next. Let me know if you need
>> > anything else to be done for this series.
>>
>> Sorry about that.  It's on for-next, with Randy's comment addressed.  There was
>> one merge conflict: we don't have resource_init() in for-next yet (which I
>> think means I missed something else).
>
> resource_init is changed to init_resource and moved to setup.c in the
> following patch which was merged in 5.11 MW.
> 00ab027a3b82 RISC-V: Add kernel image sections to the resource tree

Ah, great, for some reason I thought we hadn't merged those yet.

>> IDK if that's necessary for the NUMA
>> stuff, I just dropped it.  I haven't tested this yet.

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