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Subject[PATCH 0/5] Manual definition of Soft Reserved memory devices
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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.

All review welcome of course, but the E820 changes want an x86
maintainer ack, the efi_fake_mem update needs Ard, and Rafael has
previously shepherded the HMAT changes. For the changes to
kernel/resource.c, where there is no clear maintainer, I just copied the
last few people to make thoughtful changes in that area. I am happy to
take these through the nvdimm tree along with these prerequisites
already in -next:

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

...to create to device-dax instances:

# daxctl list -RDu
[
{
"path":"\/platform\/hmem.1",
"id":1,
"size":"4.00 GiB (4.29 GB)",
"align":2097152,
"devices":[
{
"chardev":"dax1.0",
"size":"4.00 GiB (4.29 GB)",
"target_node":3,
"mode":"devdax"
}
]
},
{
"path":"\/platform\/hmem.0",
"id":0,
"size":"4.00 GiB (4.29 GB)",
"align":2097152,
"devices":[
{
"chardev":"dax0.0",
"size":"4.00 GiB (4.29 GB)",
"target_node":2,
"mode":"devdax"
}
]
}
]

---

Dan Williams (5):
ACPI: 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/x86/kernel/e820.c | 16 +++++-
arch/x86/mm/numa.c | 4 +
drivers/acpi/numa/hmat.c | 71 +++-----------------------
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 | 1
include/linux/dax.h | 8 +++
kernel/resource.c | 1
12 files changed, 156 insertions(+), 70 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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