linux-kernel - [PATCH v5 4/8] x86/resctrl: Add node-scope to the options for feature scope

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Date:   Tue, 29 Aug 2023 16:44:22 -0700
From:   Tony Luck <tony.luck@...el.com>
To:     Fenghua Yu <fenghua.yu@...el.com>,
        Reinette Chatre <reinette.chatre@...el.com>,
        Peter Newman <peternewman@...gle.com>,
        Jonathan Corbet <corbet@....net>,
        Shuah Khan <skhan@...uxfoundation.org>, x86@...nel.org
Cc:     Shaopeng Tan <tan.shaopeng@...itsu.com>,
        James Morse <james.morse@....com>,
        Jamie Iles <quic_jiles@...cinc.com>,
        Babu Moger <babu.moger@....com>,
        Randy Dunlap <rdunlap@...radead.org>,
        linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org,
        patches@...ts.linux.dev, Tony Luck <tony.luck@...el.com>
Subject: [PATCH v5 4/8] x86/resctrl: Add node-scope to the options for feature scope

Currently supported resctrl features are all domain scoped the same as the
scope of the L2 or L3 caches.

Add "node" as a new option for domain scope.

Signed-off-by: Tony Luck <tony.luck@...el.com>
---
 include/linux/resctrl.h            | 1 +
 arch/x86/kernel/cpu/resctrl/core.c | 2 ++
 2 files changed, 3 insertions(+)

diff --git a/include/linux/resctrl.h b/include/linux/resctrl.h
index 08382548571e..f55cf7afd4eb 100644
--- a/include/linux/resctrl.h
+++ b/include/linux/resctrl.h
@@ -163,6 +163,7 @@ struct resctrl_schema;
 enum resctrl_scope {
 	RESCTRL_L3_CACHE,
 	RESCTRL_L2_CACHE,
+	RESCTRL_NODE,
 };
 
 /**
diff --git a/arch/x86/kernel/cpu/resctrl/core.c b/arch/x86/kernel/cpu/resctrl/core.c
index 3e08aa04a7ff..9fcc264fac6c 100644
--- a/arch/x86/kernel/cpu/resctrl/core.c
+++ b/arch/x86/kernel/cpu/resctrl/core.c
@@ -514,6 +514,8 @@ static int get_domain_id_from_scope(int cpu, enum resctrl_scope scope)
 		return get_cpu_cacheinfo_id(cpu, 3);
 	case RESCTRL_L2_CACHE:
 		return get_cpu_cacheinfo_id(cpu, 2);
+	case RESCTRL_NODE:
+		return cpu_to_node(cpu);
 	default:
 		WARN_ON_ONCE(1);
 		break;
-- 
2.41.0