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From:   Tony Luck <tony.luck@intel.com>
To:     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>, x86@kernel.org
Cc:     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>,
        linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org,
        patches@lists.linux.dev, Tony Luck <tony.luck@intel.com>
Subject: [PATCH v9 5/8] x86/resctrl: Add node-scope to the options for feature scope
Date:   Fri, 20 Oct 2023 14:30:57 -0700
Message-ID: <20231020213100.123598-6-tony.luck@intel.com>
In-Reply-To: <20231020213100.123598-1-tony.luck@intel.com>
References: <20231003213043.13565-1-tony.luck@intel.com>
 <20231020213100.123598-1-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.

Reviewed-by: Peter Newman <peternewman@google.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>
---
No changes since v6 except to add Peter's review tag

 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 4778ef71c893..683706355810 100644
--- a/include/linux/resctrl.h
+++ b/include/linux/resctrl.h
@@ -172,6 +172,7 @@ 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 bcc4bd2e1930..2c3975c9c20c 100644
--- a/arch/x86/kernel/cpu/resctrl/core.c
+++ b/arch/x86/kernel/cpu/resctrl/core.c
@@ -515,6 +515,8 @@ 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;
 	}
-- 
2.41.0