linux-kernel - [PATCH v2 0/2] arm_mpam: Add support for the MPAM v0.1 architecture version

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Message-ID: <20260203095406.6437-1-zengheng4@huawei.com>
Date: Tue, 3 Feb 2026 17:54:04 +0800
From: Zeng Heng <zengheng4@...wei.com>
To: <xry111@...111.site>, <catalin.marinas@....com>, <maz@...nel.org>,
	<ardb@...nel.org>, <yang@...amperecomputing.com>, <ryan.roberts@....com>,
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CC: <linux-kernel@...r.kernel.org>, <linux-arm-kernel@...ts.infradead.org>,
	<wangkefeng.wang@...wei.com>
Subject: [PATCH v2 0/2] arm_mpam: Add support for the MPAM v0.1 architecture version

According to the MPAM spec [1], the supported architecture versions are
v1.0, v1.1 and v0.1. MPAM versions v0.1 and v1.1 are functionally
identical, but v0.1 additionally supports the FORCE_NS feature.

ID_AA64PR | ID_AA64PR | MPAM Extension | Notes
F0_EL1.   | F1_EL1.   | Architecture   |
MPAM      | MPAM_frac | version        |
---------------------------------------------------------------------------
0b0000    | 0b0001    | v0.1           | MPAM v0.1 is implemented.
          |           |                | MPAM v0.1 is the same as MPAM v1.1
          |           |                | with FORCE_NS which is
          |           |                | incompatible with MPAM v1.0.
---------------------------------------------------------------------------
0b0001    | 0b0000    | v1.0           | MPAM v1.0 is implemented.
---------------------------------------------------------------------------
0b0001    | 0b0001    | v1.1           | MPAM v1.1 is implemented.
          |           |                | MPAM v1.1 includes all features of
          |           |                | MPAM v1.0.
          |           |                | It must not include FORCE_NS.

[1] https://developer.arm.com/documentation/ddi0598/db/?lang=en

Changes in v2:
- Add new patch 2 to check the MPAM MSC version.

v1: https://lore.kernel.org/all/20260104133434.1887677-1-zengheng4@huawei.com/

Zeng Heng (2):
  arm64: cpufeature: Add support for the MPAM v0.1 architecture version
  arm_mpam: Update architecture version check for MPAM MSC

 arch/arm64/include/asm/cpufeature.h |  7 +++++++
 arch/arm64/include/asm/el2_setup.h  |  4 +++-
 arch/arm64/kernel/cpufeature.c      | 15 +++++++++++----
 drivers/resctrl/mpam_devices.c      | 16 +++++++++++++---
 drivers/resctrl/mpam_internal.h     |  5 ++++-
 5 files changed, 38 insertions(+), 9 deletions(-)

--
2.25.1