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

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Message-ID: <87eb3a3d-854d-4c3c-a075-9096ca67c89d@intel.com>
Date: Thu, 4 Dec 2025 16:55:31 -0800
From: Reinette Chatre <reinette.chatre@...el.com>
To: Xiaochen Shen <shenxiaochen@...n-hieco.net>, <tony.luck@...el.com>,
	<bp@...en8.de>, <fenghuay@...dia.com>
CC: <babu.moger@....com>, <james.morse@....com>, <Dave.Martin@....com>,
	<x86@...nel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/3] selftests/resctrl: Fix non-contiguous CBM check for
 Hygon

Hi Xiaochen,

On 12/4/25 4:38 AM, Xiaochen Shen wrote:
> 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>
> ---

I think it may help to add a maintainer note here to highlight even though this
is a fix it is not a candidate for backport since, based on your other series,
support for Hygon 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 */

Reviewed-by: Reinette Chatre <reinette.chatre@...el.com>

Reinette