linux-kernel - [PATCH v2 0/3] selftests/resctrl: Add Hygon CPUs support and bug fixes

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Message-ID: <20251205092544.2685728-1-shenxiaochen@open-hieco.net>
Date: Fri,  5 Dec 2025 17:25:41 +0800
From: Xiaochen Shen <shenxiaochen@...n-hieco.net>
To: tony.luck@...el.com,
	reinette.chatre@...el.com,
	bp@...en8.de,
	fenghuay@...dia.com,
	shuah@...nel.org,
	skhan@...uxfoundation.org
Cc: babu.moger@....com,
	james.morse@....com,
	Dave.Martin@....com,
	x86@...nel.org,
	linux-kernel@...r.kernel.org,
	linux-kselftest@...r.kernel.org,
	shenxiaochen@...n-hieco.net
Subject: [PATCH v2 0/3] selftests/resctrl: Add Hygon CPUs support and bug fixes

The resctrl selftest currently exhibits several failures on Hygon CPUs
due to missing vendor detection and edge-case handling specific to
Hygon's architecture.

This patch series addresses three distinct issues:
1. Missing CPU vendor detection, causing the test to fail with
   "# Can not get vendor info..." on Hygon CPUs.
2. A division-by-zero crash in SNC detection on Hygon CPUs.
3. Incorrect handling of non-contiguous CBM support on Hygon CPUs.

These changes enable resctrl selftest to run successfully on
Hygon CPUs that support Platform QoS features.

Changelog:
v2:
- Patch 1: switch all of the vendor id bitmasks to use BIT() (Reinette)
- Patch 2: add Reviewed-by: Reinette Chatre <reinette.chatre@...el.com>
- Patch 3: add Reviewed-by: Reinette Chatre <reinette.chatre@...el.com>
           add a maintainer note to highlight it is not a candidate for
	   backport (Reinette)

Xiaochen Shen (3):
  selftests/resctrl: Add CPU vendor detection for Hygon
  selftests/resctrl: Fix a division by zero error on Hygon
  selftests/resctrl: Fix non-contiguous CBM check for Hygon

 tools/testing/selftests/resctrl/cat_test.c      |  4 ++--
 tools/testing/selftests/resctrl/resctrl.h       |  6 ++++--
 tools/testing/selftests/resctrl/resctrl_tests.c |  2 ++
 tools/testing/selftests/resctrl/resctrlfs.c     | 10 ++++++++++
 4 files changed, 18 insertions(+), 4 deletions(-)

-- 
2.47.3