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From: Tony Luck <tony.luck@intel.com>
To: Borislav Petkov <bp@alien8.de>
Cc: Fenghua Yu <fenghua.yu@intel.com>,
	Reinette Chatre <reinette.chatre@intel.com>,
	Peter Newman <peternewman@google.com>,
	Jonathan Corbet <corbet@lwn.net>,
	Shuah Khan <skhan@linuxfoundation.org>,
	Shaopeng Tan <tan.shaopeng@fujitsu.com>,
	James Morse <james.morse@arm.com>,
	Jamie Iles <quic_jiles@quicinc.com>,
	Babu Moger <babu.moger@amd.com>,
	Randy Dunlap <rdunlap@infradead.org>,
	x86@kernel.org,
	linux-kernel@vger.kernel.org,
	linux-doc@vger.kernel.org,
	patches@lists.linux.dev,
	Tony Luck <tony.luck@intel.com>,
	Shaopeng Tan <tan.shaopeng@jp.fujitsu.com>
Subject: [PATCH v14 5/8] x86/resctrl: Add node-scope to the options for feature scope
Date: Fri, 26 Jan 2024 14:38:34 -0800
Message-ID: <20240126223837.21835-6-tony.luck@intel.com>
In-Reply-To: <20240126223837.21835-1-tony.luck@intel.com>
References: <20231204185357.120501-1-tony.luck@intel.com>
 <20240126223837.21835-1-tony.luck@intel.com>
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Currently supported resctrl features are all domain scoped the same as the
scope of the L2 or L3 caches.

Add RESCTRL_NODE as a new option for features that are scoped at the
same granularity as NUMA nodes. This is needed for Intel's Sub-NUMA
Cluster (SNC) feature where monitoring features are node scoped.

Tested-by: Shaopeng Tan <tan.shaopeng@jp.fujitsu.com>
Reviewed-by: Peter Newman <peternewman@google.com>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Reviewed-by: Shaopeng Tan <tan.shaopeng@jp.fujitsu.com>
Reviewed-by: Babu Moger <babu.moger@amd.com>
Signed-off-by: Tony Luck <tony.luck@intel.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 058a940c3239..b8a3a11b970d 100644
--- a/include/linux/resctrl.h
+++ b/include/linux/resctrl.h
@@ -170,6 +170,7 @@ struct resctrl_schema;
 enum resctrl_scope {
 	RESCTRL_L2_CACHE = 2,
 	RESCTRL_L3_CACHE = 3,
+	RESCTRL_NODE,
 };
 
 /**
diff --git a/arch/x86/kernel/cpu/resctrl/core.c b/arch/x86/kernel/cpu/resctrl/core.c
index d7c0651d337d..27523841f9fd 100644
--- a/arch/x86/kernel/cpu/resctrl/core.c
+++ b/arch/x86/kernel/cpu/resctrl/core.c
@@ -500,6 +500,8 @@ static int get_domain_id_from_scope(int cpu, enum resctrl_scope scope)
 	case RESCTRL_L2_CACHE:
 	case RESCTRL_L3_CACHE:
 		return get_cpu_cacheinfo_id(cpu, scope);
+	case RESCTRL_NODE:
+		return cpu_to_node(cpu);
 	default:
 		break;
 	}
-- 
2.43.0