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arm64: kconfig: Add Kconfig entry for MPAM

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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>
This commit is contained in:
James Morse
2025-11-19 12:22:36 +00:00
committed by Catalin Marinas
parent a39a723a6f
commit d8bf01d809
1 changed files with 23 additions and 0 deletions
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arch/arm64/Kconfig
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@@ -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"