[PATCH v2 00/25] mm: introduce numa_memblks

From: Mike Rapoport
Date: Tue Jul 23 2024 - 02:42:35 EST

From: "Mike Rapoport (Microsoft)" <rppt@xxxxxxxxxx>

Hi,

Following the discussion about handling of CXL fixed memory windows on
arm64 [1] I decided to bite the bullet and move numa_memblks from x86 to
the generic code so they will be available on arm64/riscv and maybe on
loongarch sometime later.

While it could be possible to use memblock to describe CXL memory windows,
it currently lacks notion of unpopulated memory ranges and numa_memblks
does implement this.

Another reason to make numa_memblks generic is that both arch_numa (arm64
and riscv) and loongarch use trimmed copy of x86 code although there is no
fundamental reason why the same code cannot be used on all these platforms.
Having numa_memblks in mm/ will make it's interaction with ACPI and FDT
more consistent and I believe will reduce maintenance burden.

And with generic numa_memblks it is (almost) straightforward to enable NUMA
emulation on arm64 and riscv.

The first 9 commits in this series are cleanups that are not strictly
related to numa_memblks.
Commits 10-16 slightly reorder code in x86 to allow extracting numa_memblks
and NUMA emulation to the generic code.
Commits 17-19 actually move the code from arch/x86/ to mm/ and commits 20-22
does some aftermath cleanups.
Commit 23 switches arch_numa to numa_memblks.
Commit 24 enables usage of phys_to_target_node() and
memory_add_physaddr_to_nid() with numa_memblks.
Commit 25 moves the description for numa=fake from x86 to admin-guide

[1] https://lore.kernel.org/all/20240529171236.32002-1-Jonathan.Cameron@xxxxxxxxxx/

v1: https://lore.kernel.org/all/20240716111346.3676969-1-rppt@xxxxxxxxxx
* add cleanup for arch_alloc_nodedata and HAVE_ARCH_NODEDATA_EXTENSION
* add patch that moves description of numa=fake kernel parameter from
x86 to admin-guide
* reduce rounding up of node_data allocations from PAGE_SIZE to
SMP_CACHE_BYTES
* restore single allocation attempt of numa_distance
* fix several comments
* added review tags

Mike Rapoport (Microsoft) (25):
mm: move kernel/numa.c to mm/
MIPS: sgi-ip27: make NODE_DATA() the same as on all other architectures
MIPS: sgi-ip27: ensure node_possible_map only contains valid nodes
MIPS: sgi-ip27: drop HAVE_ARCH_NODEDATA_EXTENSION
MIPS: loongson64: rename __node_data to node_data
MIPS: loongson64: drop HAVE_ARCH_NODEDATA_EXTENSION
mm: drop CONFIG_HAVE_ARCH_NODEDATA_EXTENSION
arch, mm: move definition of node_data to generic code
arch, mm: pull out allocation of NODE_DATA to generic code
x86/numa: simplify numa_distance allocation
x86/numa: use get_pfn_range_for_nid to verify that node spans memory
x86/numa: move FAKE_NODE_* defines to numa_emu
x86/numa_emu: simplify allocation of phys_dist
x86/numa_emu: split __apicid_to_node update to a helper function
x86/numa_emu: use a helper function to get MAX_DMA32_PFN
x86/numa: numa_{add,remove}_cpu: make cpu parameter unsigned
mm: introduce numa_memblks
mm: move numa_distance and related code from x86 to numa_memblks
mm: introduce numa_emulation
mm: numa_memblks: introduce numa_memblks_init
mm: numa_memblks: make several functions and variables static
mm: numa_memblks: use memblock_{start,end}_of_DRAM() when sanitizing
meminfo
arch_numa: switch over to numa_memblks
mm: make range-to-target_node lookup facility a part of numa_memblks
docs: move numa=fake description to kernel-parameters.txt

.../admin-guide/kernel-parameters.txt | 15 +
.../arch/x86/x86_64/boot-options.rst | 12 -
arch/arm64/include/asm/Kbuild | 1 +
arch/arm64/include/asm/mmzone.h | 13 -
arch/arm64/include/asm/topology.h | 1 +
arch/loongarch/include/asm/Kbuild | 1 +
arch/loongarch/include/asm/mmzone.h | 16 -
arch/loongarch/include/asm/topology.h | 1 +
arch/loongarch/kernel/numa.c | 21 -
arch/mips/Kconfig | 5 -
arch/mips/include/asm/mach-ip27/mmzone.h | 1 -
.../mips/include/asm/mach-loongson64/mmzone.h | 4 -
arch/mips/loongson64/numa.c | 28 +-
arch/mips/sgi-ip27/ip27-memory.c | 12 +-
arch/mips/sgi-ip27/ip27-smp.c | 2 +
arch/powerpc/include/asm/mmzone.h | 6 -
arch/powerpc/mm/numa.c | 26 +-
arch/riscv/include/asm/Kbuild | 1 +
arch/riscv/include/asm/mmzone.h | 13 -
arch/riscv/include/asm/topology.h | 4 +
arch/s390/include/asm/Kbuild | 1 +
arch/s390/include/asm/mmzone.h | 17 -
arch/s390/kernel/numa.c | 3 -
arch/sh/include/asm/mmzone.h | 3 -
arch/sh/mm/init.c | 7 +-
arch/sh/mm/numa.c | 3 -
arch/sparc/include/asm/mmzone.h | 4 -
arch/sparc/mm/init_64.c | 11 +-
arch/x86/Kconfig | 9 +-
arch/x86/include/asm/Kbuild | 1 +
arch/x86/include/asm/mmzone.h | 6 -
arch/x86/include/asm/mmzone_32.h | 17 -
arch/x86/include/asm/mmzone_64.h | 18 -
arch/x86/include/asm/numa.h | 26 +-
arch/x86/include/asm/sparsemem.h | 9 -
arch/x86/mm/Makefile | 1 -
arch/x86/mm/amdtopology.c | 1 +
arch/x86/mm/numa.c | 618 +-----------------
arch/x86/mm/numa_internal.h | 24 -
drivers/acpi/numa/srat.c | 1 +
drivers/base/Kconfig | 1 +
drivers/base/arch_numa.c | 223 ++-----
drivers/cxl/Kconfig | 2 +-
drivers/dax/Kconfig | 2 +-
drivers/of/of_numa.c | 1 +
include/asm-generic/mmzone.h | 5 +
include/asm-generic/numa.h | 6 +-
include/linux/memory_hotplug.h | 48 --
include/linux/numa.h | 5 +
include/linux/numa_memblks.h | 58 ++
kernel/Makefile | 1 -
kernel/numa.c | 26 -
mm/Kconfig | 11 +
mm/Makefile | 3 +
mm/mm_init.c | 3 +-
mm/numa.c | 57 ++
{arch/x86/mm => mm}/numa_emulation.c | 42 +-
mm/numa_memblks.c | 568 ++++++++++++++++
58 files changed, 867 insertions(+), 1158 deletions(-)
delete mode 100644 arch/arm64/include/asm/mmzone.h
delete mode 100644 arch/loongarch/include/asm/mmzone.h
delete mode 100644 arch/riscv/include/asm/mmzone.h
delete mode 100644 arch/s390/include/asm/mmzone.h
delete mode 100644 arch/x86/include/asm/mmzone.h
delete mode 100644 arch/x86/include/asm/mmzone_32.h
delete mode 100644 arch/x86/include/asm/mmzone_64.h
create mode 100644 include/asm-generic/mmzone.h
create mode 100644 include/linux/numa_memblks.h
delete mode 100644 kernel/numa.c
create mode 100644 mm/numa.c
rename {arch/x86/mm => mm}/numa_emulation.c (94%)
create mode 100644 mm/numa_memblks.c


base-commit: 22a40d14b572deb80c0648557f4bd502d7e83826
--
2.43.0