Commit d8bf01d8 authored Nov 19, 2025 by James Morse Committed by Catalin Marinas Nov 19, 2025

arm64: kconfig: Add Kconfig entry for MPAM



The bulk of the MPAM driver lives outside the arch code because it
largely manages MMIO devices that generate interrupts. The driver
needs a Kconfig symbol to enable it. As MPAM is only found on arm64
platforms, the arm64 tree is the most natural home for the Kconfig
option.

This Kconfig option will later be used by the arch code to enable
or disable the MPAM context-switch code, and to register properties
of CPUs with the MPAM driver.

Signed-off-by: James Morse <james.morse@arm.com>
Reviewed-by: Jonathan Cameron <jonathan.cameron@huawei.com>
Reviewed-by: Ben Horgan <ben.horgan@arm.com>
Reviewed-by: Fenghua Yu <fenghuay@nvidia.com>
Reviewed-by: Gavin Shan <gshan@redhat.com>
Reviewed-by: Shaopeng Tan <tan.shaopeng@jp.fujitsu.com>
Tested-by: Fenghua Yu <fenghuay@nvidia.com>
Tested-by: Shaopeng Tan <tan.shaopeng@jp.fujitsu.com>
Tested-by: Peter Newman <peternewman@google.com>
Tested-by: Carl Worth <carl@os.amperecomputing.com>
Tested-by: Gavin Shan <gshan@redhat.com>
Tested-by: Zeng Heng <zengheng4@huawei.com>
Tested-by: Hanjun Guo <guohanjun@huawei.com>
CC: Dave Martin <dave.martin@arm.com>
Signed-off-by: Ben Horgan <ben.horgan@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

parent a39a723a

arch/arm64/Kconfig

+23 −0

Original line number	Diff line number	Diff line
		@@ -2023,6 +2023,29 @@ config ARM64_TLB_RANGE
		ARMv8.4-TLBI provides TLBI invalidation instruction that apply to a
		range of input addresses.

		config ARM64_MPAM
		bool "Enable support for MPAM"
		help
		Memory System Resource Partitioning and Monitoring (MPAM) is an
		optional extension to the Arm architecture that allows each
		transaction issued to the memory system to be labelled with a
		Partition identifier (PARTID) and Performance Monitoring Group
		identifier (PMG).

		Memory system components, such as the caches, can be configured with
		policies to control how much of various physical resources (such as
		memory bandwidth or cache memory) the transactions labelled with each
		PARTID can consume. Depending on the capabilities of the hardware,
		the PARTID and PMG can also be used as filtering criteria to measure
		the memory system resource consumption of different parts of a
		workload.

		Use of this extension requires CPU support, support in the
		Memory System Components (MSC), and a description from firmware
		of where the MSCs are in the address space.

		MPAM is exposed to user-space via the resctrl pseudo filesystem.

		endmenu # "ARMv8.4 architectural features"

		menu "ARMv8.5 architectural features"