From: James Morse Date: Wed, 19 Nov 2025 12:22:36 +0000 (+0000) Subject: arm64: kconfig: Add Kconfig entry for MPAM X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=d8bf01d80919e81a06dca77556dcfb351fa99b0c;p=thirdparty%2Fkernel%2Flinux.git 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 Reviewed-by: Jonathan Cameron Reviewed-by: Ben Horgan Reviewed-by: Fenghua Yu Reviewed-by: Gavin Shan Reviewed-by: Shaopeng Tan Tested-by: Fenghua Yu Tested-by: Shaopeng Tan Tested-by: Peter Newman Tested-by: Carl Worth Tested-by: Gavin Shan Tested-by: Zeng Heng Tested-by: Hanjun Guo CC: Dave Martin Signed-off-by: Ben Horgan Signed-off-by: Catalin Marinas --- diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index 6663ffd23f252..67015d51f7b50 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -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"