linux-kernel - [PATCH 02/10] x86/resctrl: Add new rdt

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Date: Wed, 27 Mar 2024 13:03:44 -0700
From: Tony Luck <tony.luck@...el.com>
To: Fenghua Yu <fenghua.yu@...el.com>,
	Reinette Chatre <reinette.chatre@...el.com>,
	Maciej Wieczor-Retman <maciej.wieczor-retman@...el.com>,
	Peter Newman <peternewman@...gle.com>,
	James Morse <james.morse@....com>,
	Babu Moger <babu.moger@....com>,
	Drew Fustini <dfustini@...libre.com>
Cc: x86@...nel.org,
	linux-kernel@...r.kernel.org,
	patches@...ts.linux.dev,
	Tony Luck <tony.luck@...el.com>
Subject: [PATCH 02/10] x86/resctrl: Add new rdt_resource for sub-node monitoring

When a system enables Sub-NUMA Cluster (SNC) mode each CPU socket is
divided into 2 or more NUMA nodes. CPU cores and memory are divided
between these nodes. L3 cache monitoring functions are independently
implemented on each SNC node.

Add a new rdt_resource as a foundation for the structures to track
monitor resources in each of the L3 sub-nodes.

Add new scope option RESCTRL_NODE to build domains scoped at the
NUMA node level.

Signed-off-by: Tony Luck <tony.luck@...el.com>
---
 include/linux/resctrl.h                |  1 +
 arch/x86/kernel/cpu/resctrl/internal.h |  1 +
 arch/x86/kernel/cpu/resctrl/core.c     | 12 ++++++++++++
 3 files changed, 14 insertions(+)

diff --git a/include/linux/resctrl.h b/include/linux/resctrl.h
index ed693bfe474d..f39a07b27a98 100644
--- a/include/linux/resctrl.h
+++ b/include/linux/resctrl.h
@@ -153,6 +153,7 @@ struct resctrl_schema;
 enum resctrl_scope {
 	RESCTRL_L2_CACHE = 2,
 	RESCTRL_L3_CACHE = 3,
+	RESCTRL_NODE,
 };
 
 /**
diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/resctrl/internal.h
index 8f40fb35db78..24fad5ecc158 100644
--- a/arch/x86/kernel/cpu/resctrl/internal.h
+++ b/arch/x86/kernel/cpu/resctrl/internal.h
@@ -472,6 +472,7 @@ enum resctrl_res_level {
 	RDT_RESOURCE_L2,
 	RDT_RESOURCE_MBA,
 	RDT_RESOURCE_SMBA,
+	RDT_RESOURCE_SUBL3,
 
 	/* Must be the last */
 	RDT_NUM_RESOURCES,
diff --git a/arch/x86/kernel/cpu/resctrl/core.c b/arch/x86/kernel/cpu/resctrl/core.c
index 4c5e985e1388..395bcb3199f8 100644
--- a/arch/x86/kernel/cpu/resctrl/core.c
+++ b/arch/x86/kernel/cpu/resctrl/core.c
@@ -115,6 +115,16 @@ struct rdt_hw_resource rdt_resources_all[] = {
 			.fflags			= RFTYPE_RES_MB,
 		},
 	},
+	[RDT_RESOURCE_SUBL3] =
+	{
+		.r_resctrl = {
+			.rid			= RDT_RESOURCE_SUBL3,
+			.name			= "SUBL3",
+			.scope			= RESCTRL_NODE,
+			.domains		= domain_init(RDT_RESOURCE_SUBL3),
+			.fflags			= RFTYPE_RES_CACHE,
+		},
+	},
 };
 
 /*
@@ -487,6 +497,8 @@ 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;
 	}
-- 
2.44.0