[PATCH v4 0/4] Add ACPI NUMA support for RISC-V

[Palmer Dabbelt]

On Thu, 13 Jun 2024 01:54:32 PDT (-0700), haibo1.xu at intel.com wrote:
> This patch series enable RISC-V ACPI NUMA support which was based on
> the recently approved ACPI ECR[1].
>
> Patch 1/4 add RISC-V specific acpi_numa.c file to parse NUMA information
> from SRAT and SLIT ACPI tables.
> Patch 2/4 add the common SRAT RINTC affinity structure handler.
> Patch 3/4 change the ACPI_NUMA to a hidden option since it would be selected
> by default on all supported platform.
> Patch 4/4 replace pr_info with pr_debug in arch_acpi_numa_init() to avoid
> potential boot noise on ACPI platforms that are not NUMA.
>
> Based-on: https://github.com/linux-riscv/linux-riscv/tree/for-next

No big deal, but that's not actually my repo.  Looks like it's just 
mirroring something, I use the kernel.org git stuff these days.  I 
dropped it from the cover letter for the merge, it's not super useful 
anyway because it's a branch so nobody will know what it means later.

Aside from that things look good, I've got this queued up for the 
tester.

>
> [1] https://drive.google.com/file/d/1YTdDx2IPm5IeZjAW932EYU-tUtgS08tX/view?usp=sharing
>
> Testing:
> Since the ACPI AIA/PLIC support patch set is still under upstream review,
> hence it is tested using the poll based HVC SBI console and RAM disk.
> 1) Build latest Qemu with the following patch backported
>    https://github.com/vlsunil/qemu/commit/42bd4eeefd5d4410a68f02d54fee406d8a1269b0
>
> 2) Build latest EDK-II
>    https://github.com/tianocore/edk2/blob/master/OvmfPkg/RiscVVirt/README.md
>
> 3) Build Linux with the following configs enabled
>    CONFIG_RISCV_SBI_V01=y
>    CONFIG_SERIAL_EARLYCON_RISCV_SBI=y
>    CONFIG_NONPORTABLE=y
>    CONFIG_HVC_RISCV_SBI=y
>    CONFIG_NUMA=y
>    CONFIG_ACPI_NUMA=y
>
> 4) Build buildroot rootfs.cpio
>
> 5) Launch the Qemu machine
>    qemu-system-riscv64 -nographic \
>    -machine virt,pflash0=pflash0,pflash1=pflash1 -smp 4 -m 8G \
>    -blockdev node-name=pflash0,driver=file,read-only=on,filename=RISCV_VIRT_CODE.fd \
>    -blockdev node-name=pflash1,driver=file,filename=RISCV_VIRT_VARS.fd \
>    -object memory-backend-ram,size=4G,id=m0 \
>    -object memory-backend-ram,size=4G,id=m1 \
>    -numa node,memdev=m0,cpus=0-1,nodeid=0 \
>    -numa node,memdev=m1,cpus=2-3,nodeid=1 \
>    -numa dist,src=0,dst=1,val=30 \
>    -kernel linux/arch/riscv/boot/Image \
>    -initrd buildroot/output/images/rootfs.cpio \
>    -append "root=/dev/ram ro console=hvc0 earlycon=sbi"
>
> [    0.000000] ACPI: SRAT: Node 0 PXM 0 [mem 0x80000000-0x17fffffff]
> [    0.000000] ACPI: SRAT: Node 1 PXM 1 [mem 0x180000000-0x27fffffff]
> [    0.000000] NUMA: NODE_DATA [mem 0x17fe3bc40-0x17fe3cfff]
> [    0.000000] NUMA: NODE_DATA [mem 0x27fff4c40-0x27fff5fff]
> ...
> [    0.000000] ACPI: NUMA: SRAT: PXM 0 -> HARTID 0x0 -> Node 0
> [    0.000000] ACPI: NUMA: SRAT: PXM 0 -> HARTID 0x1 -> Node 0
> [    0.000000] ACPI: NUMA: SRAT: PXM 1 -> HARTID 0x2 -> Node 1
> [    0.000000] ACPI: NUMA: SRAT: PXM 1 -> HARTID 0x3 -> Node 1
>
> ---
> Changes since v3
>   - Rebase to linux-riscv/for-next(Linux 6.10-rc1)
>   - Remove original patch 1/6 since it had been merged through
>     ACPICA pull(commit fe1c408d50604f)
>   - Remove original patch 4/6 since the related changes was
>     introduced in commit 3a785e19f43267
>
> Haibo Xu (4):
>   ACPI: RISCV: Add NUMA support based on SRAT and SLIT
>   ACPI: NUMA: Add handler for SRAT RINTC affinity structure
>   ACPI: NUMA: change the ACPI_NUMA to a hidden option
>   ACPI: NUMA: replace pr_info with pr_debug in arch_acpi_numa_init
>
>  arch/arm64/Kconfig            |   1 -
>  arch/loongarch/Kconfig        |   1 -
>  arch/riscv/include/asm/acpi.h |  15 +++-
>  arch/riscv/kernel/Makefile    |   1 +
>  arch/riscv/kernel/acpi.c      |   5 --
>  arch/riscv/kernel/acpi_numa.c | 131 ++++++++++++++++++++++++++++++++++
>  arch/riscv/kernel/setup.c     |   4 +-
>  arch/riscv/kernel/smpboot.c   |   2 -
>  drivers/acpi/numa/Kconfig     |   5 +-
>  drivers/acpi/numa/srat.c      |  32 ++++++++-
>  drivers/base/arch_numa.c      |   2 +-
>  include/linux/acpi.h          |   6 ++
>  12 files changed, 187 insertions(+), 18 deletions(-)
>  create mode 100644 arch/riscv/kernel/acpi_numa.c