[PATCH v2 3/4] ACPI: Add documentation for exposing MRRM data

Tony Luck
2025-02-27T22:48:41Z

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

Signed-off-by: Tony Luck <tony.luck@intel.com>
---
Documentation/ABI/testing/sysfs-firmware-acpi | 16 ++++++++++++++++
1 file changed, 16 insertions(+)

diff --git a/Documentation/ABI/testing/sysfs-firmware-acpi b/Documentation/ABI/testing/sysfs-firmware-acpi
index 5249ad5a96d9..a3369cf95546 100644
--- a/Documentation/ABI/testing/sysfs-firmware-acpi
+++ b/Documentation/ABI/testing/sysfs-firmware-acpi
@@ -248,3 +248,19 @@ 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.
+
+ 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.
--
2.48.1