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ACPI: Add documentation for exposing MRRM data

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Initial implementation provides enumeration of the address ranges
NUMA node numbers, and BIOS assigned region IDs for each range.

Signed-off-by: Tony Luck <tony.luck@intel.com>
Link: https://patch.msgid.link/20250505173819.419271-4-tony.luck@intel.com
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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Tony Luck 2025-05-05 10:38:19 -07:00 committed by Rafael J. Wysocki
parent 04f53540f7
commit 0a07a5af23
1 changed files with 21 additions and 0 deletions
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21
Documentation/ABI/testing/sysfs-firmware-acpi
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@ -248,3 +248,24 @@ Description:
# cat ff_pwr_btn
7 enabled
What: /sys/firmware/acpi/memory_ranges/rangeX
Date: February 2025
Contact: Tony Luck <tony.luck@intel.com>
Description:
On systems with the ACPI MRRM table reports the parameters for
each range.
base: Starting system physical address.
length: Length of this range in bytes.
node: NUMA node that this range belongs to. Negative numbers
indicate that the node number could not be determined (e.g
for an address range that is reserved for future hot add of
memory).
local_region_id: ID associated with access by agents
local to this range of addresses.
remote_region_id: ID associated with access by agents
non-local to this range of addresses.