From 0a07a5af234b8cc6c2982e5c1e7bdff806902e16 Mon Sep 17 00:00:00 2001 From: Tony Luck Date: Mon, 5 May 2025 10:38:19 -0700 Subject: [PATCH] ACPI: Add documentation for exposing MRRM data Initial implementation provides enumeration of the address ranges NUMA node numbers, and BIOS assigned region IDs for each range. Signed-off-by: Tony Luck Link: https://patch.msgid.link/20250505173819.419271-4-tony.luck@intel.com Signed-off-by: Rafael J. Wysocki --- Documentation/ABI/testing/sysfs-firmware-acpi | 21 +++++++++++++++++++ 1 file changed, 21 insertions(+) diff --git a/Documentation/ABI/testing/sysfs-firmware-acpi b/Documentation/ABI/testing/sysfs-firmware-acpi index 5249ad5a96d98..f4de60c4134d4 100644 --- a/Documentation/ABI/testing/sysfs-firmware-acpi +++ b/Documentation/ABI/testing/sysfs-firmware-acpi @@ -248,3 +248,24 @@ Description: # cat ff_pwr_btn 7 enabled +What: /sys/firmware/acpi/memory_ranges/rangeX +Date: February 2025 +Contact: Tony Luck +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. -- 2.47.3