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Subject[PATCH v2 0/6] Manual definition of Soft Reserved memory devices
Changes since v1 [1]:
- Kill the ifdef'ery in arch/x86/mm/numa.c (Rafael)

- Add a dummy phys_to_target_node() for ARM64 (0day-robot)

- Initialize ->child and ->sibling to NULL in the resource returned by
find_next_iomem_res() (Inspired by Tom's feedback even though it does
not set them like he suggested)

- Collect Ard's Ack



My primary motivation is making the dax_kmem facility useful to
shipping platforms that have performance differentiated memory, but
may not have EFI-defined soft-reservations / HMAT (or
non-EFI-ACPI-platform equivalent). I'm anticipating HMAT enabled
platforms where the platform firmware policy for what is
soft-reserved, or not, is not the policy the system owner would pick.
I'd also highlight Joao's work [2] (see the TODO section) as an
indication of the demand for custom carving memory resources and
applying the device-dax memory management interface.

Given the current dearth of systems that supply an ACPI HMAT table, and
the utility of being able to manually define device-dax "hmem" instances
via the efi_fake_mem= option, relax the requirements for creating these
devices. Specifically, add an option (numa=nohmat) to optionally disable
consideration of the HMAT and update efi_fake_mem= to behave like
memmap=nn!ss in terms of delimiting device boundaries.


With Ard's and Rafael's ack I'd feel ok taking this through the nvdimm
tree, please holler if anything still needs some fixups.


b2ca916ce392 ACPI: NUMA: Up-level "map to online node" functionality
4fcbe96e4d0b mm/numa: Skip NUMA_NO_NODE and online nodes in numa_map_to_online_node()
575e23b6e13c powerpc/papr_scm: Switch to numa_map_to_online_node()
1e5d8e1e47af x86/mm: Introduce CONFIG_NUMA_KEEP_MEMINFO
5d30f92e7631 x86/NUMA: Provide a range-to-target_node lookup facility
7b27a8622f80 libnvdimm/e820: Retrieve and populate correct 'target_node' info

Tested with:

numa=nohmat efi_fake_mem=4G@9G:0x40000,4G@13G:0x40000 create to device-dax instances:

# daxctl list -RDu
"size":"4.00 GiB (4.29 GB)",
"size":"4.00 GiB (4.29 GB)",
"size":"4.00 GiB (4.29 GB)",
"size":"4.00 GiB (4.29 GB)",


Dan Williams (6):
x86/numa: Cleanup configuration dependent command-line options
x86/numa: Add 'nohmat' option
efi/fake_mem: Arrange for a resource entry per efi_fake_mem instance
ACPI: HMAT: Refactor hmat_register_target_device to hmem_register_device
resource: Report parent to walk_iomem_res_desc() callback
ACPI: HMAT: Attach a device for each soft-reserved range

arch/arm64/mm/numa.c | 13 +++++
arch/x86/include/asm/numa.h | 8 +++
arch/x86/kernel/e820.c | 16 +++++-
arch/x86/mm/numa.c | 10 +---
arch/x86/mm/numa_emulation.c | 3 +
arch/x86/xen/enlighten_pv.c | 2 -
drivers/acpi/numa/hmat.c | 76 +++++----------------------
drivers/acpi/numa/srat.c | 9 +++
drivers/dax/Kconfig | 5 ++
drivers/dax/Makefile | 3 -
drivers/dax/hmem/Makefile | 6 ++
drivers/dax/hmem/device.c | 97 +++++++++++++++++++++++++++++++++++
drivers/dax/hmem/hmem.c | 2 -
drivers/firmware/efi/x86_fake_mem.c | 12 +++-
include/acpi/acpi_numa.h | 14 +++++
include/linux/dax.h | 8 +++
kernel/resource.c | 11 +++-
17 files changed, 209 insertions(+), 86 deletions(-)
create mode 100644 drivers/dax/hmem/Makefile
create mode 100644 drivers/dax/hmem/device.c
rename drivers/dax/{hmem.c => hmem/hmem.c} (98%)

base-commit: 7b27a8622f802761d5c6abd6c37b22312a35343c

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