linux-kernel - RE: [PATCH v2 7/7] x86/resctrl: Determine if Sub-NUMA Cluster is enabled and initialize.

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Date:   Thu, 29 Jun 2023 15:56:28 +0000
From:   "Luck, Tony" <tony.luck@...el.com>
To:     "Shaopeng Tan (Fujitsu)" <tan.shaopeng@...itsu.com>,
        "Yu, Fenghua" <fenghua.yu@...el.com>,
        "Chatre, Reinette" <reinette.chatre@...el.com>,
        "Peter Newman" <peternewman@...gle.com>,
        Jonathan Corbet <corbet@....net>,
        "x86@...nel.org" <x86@...nel.org>
CC:     James Morse <james.morse@....com>,
        Jamie Iles <quic_jiles@...cinc.com>,
        Babu Moger <babu.moger@....com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
        "patches@...ts.linux.dev" <patches@...ts.linux.dev>
Subject: RE: [PATCH v2 7/7] x86/resctrl: Determine if Sub-NUMA Cluster is
 enabled and initialize.

>> +static const struct x86_cpu_id snc_cpu_ids[] __initconst = {
>> +	X86_MATCH_INTEL_FAM6_MODEL(ICELAKE_X, 0),
>> +	X86_MATCH_INTEL_FAM6_MODEL(SAPPHIRERAPIDS_X, 0),
>> +	X86_MATCH_INTEL_FAM6_MODEL(EMERALDRAPIDS_X, 0),
>> +	{}
>> +};
>
> Cascade Lake and Skylake also seem to support Sub-NUMA cluster.
> At least in my environment(Intel(R) Xeon(R) Gold 6254 CPU @ 3.10GHz),
> Sub-NUMA cluster is supported.

Shaopeng TAN,

This is true. But MSR_RMID_SNC_CONFIG  (0xCA0) is not implemented
for CPUs before ICELAKE.

-Tony