linux-kernel - [PATCH v2 3/3] selftests/resctrl: Fix non-contiguous CBM check for Hygon

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Message-ID: <20251205092544.2685728-4-shenxiaochen@open-hieco.net>
Date: Fri,  5 Dec 2025 17:25:44 +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 3/3] selftests/resctrl: Fix non-contiguous CBM check for Hygon

The resctrl selftest currently fails on Hygon CPUs that always supports
non-contiguous CBM, printing the error:

  "# Hardware and kernel differ on non-contiguous CBM support!"

This occurs because the arch_supports_noncont_cat() function lacks
vendor detection for Hygon CPUs, preventing proper identification of
their non-contiguous CBM capability.

Fix this by adding Hygon vendor ID detection to
arch_supports_noncont_cat().

Signed-off-by: Xiaochen Shen <shenxiaochen@...n-hieco.net>
Reviewed-by: Reinette Chatre <reinette.chatre@...el.com>
---
Maintainer note:
Even though this is a fix it is not a candidate for backport since it is
based on another patch series (x86/resctrl: Fix Platform QoS issues for
Hygon) which is in process of being added to resctrl.

 tools/testing/selftests/resctrl/cat_test.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tools/testing/selftests/resctrl/cat_test.c b/tools/testing/selftests/resctrl/cat_test.c
index 94cfdba5308d..59a0f80fdc5a 100644
--- a/tools/testing/selftests/resctrl/cat_test.c
+++ b/tools/testing/selftests/resctrl/cat_test.c
@@ -290,8 +290,8 @@ static int cat_run_test(const struct resctrl_test *test, const struct user_param
 
 static bool arch_supports_noncont_cat(const struct resctrl_test *test)
 {
-	/* AMD always supports non-contiguous CBM. */
-	if (get_vendor() == ARCH_AMD)
+	/* AMD and Hygon always supports non-contiguous CBM. */
+	if (get_vendor() == ARCH_AMD || get_vendor() == ARCH_HYGON)
 		return true;
 
 #if defined(__i386__) || defined(__x86_64__) /* arch */
-- 
2.47.3