[PATCH v5 0/5] Unify NUMA implementation between ARM64 & RISC-V

[Atish Patra]

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 at huawei.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

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2.25.1