[RFC PATCH v2 0/4] riscv: Add numa support for riscv64 platform

[Greentime Hu <greentime.hu@sifive.com>]

riscv: Add numa support for riscv64 platform

This implementation is based on arm64 porting. It is tested with
qemu-system-riscv64, SiFive Unleashed board and OmniXtend FPGA platform.

There will be two nodes in /sys/devices/system/node if it is described in
dts and CONFIG_NUMA is enabled. We can use numastat/numactl/numademo to see
its status.

Changes in v2:
- split this patch to more patches to be more readable
- set cpu->hotplugable to 0 since it is not supported yet
- add more explanation for moving unflatten_device_tree() to paging_init()

Greentime Hu (4):
  riscv: Add support pte_protnone and pmd_protnone if
    CONFIG_NUMA_BALANCING
  riscv: Move unflatten_device_tree() to paging_init() because
    riscv_numa_init() needs the dt information.
  riscv: Use variable this_cpu instead of smp_processor_id()
  riscv: Add numa support for riscv64 platform

 arch/riscv/Kconfig               |  30 ++-
 arch/riscv/include/asm/mmzone.h  |  13 ++
 arch/riscv/include/asm/numa.h    |  46 ++++
 arch/riscv/include/asm/pci.h     |  10 +
 arch/riscv/include/asm/pgtable.h |  20 ++
 arch/riscv/kernel/setup.c        |  26 ++-
 arch/riscv/kernel/smpboot.c      |  20 +-
 arch/riscv/mm/Makefile           |   1 +
 arch/riscv/mm/init.c             |   3 +
 arch/riscv/mm/numa.c             | 372 +++++++++++++++++++++++++++++++
 10 files changed, 536 insertions(+), 5 deletions(-)
 create mode 100644 arch/riscv/include/asm/mmzone.h
 create mode 100644 arch/riscv/include/asm/numa.h
 create mode 100644 arch/riscv/mm/numa.c

-- 
2.17.1