linux-kernel - [PATCH v3 3/8] x86/resctrl: Add a new node-scoped resource to rdt_resources

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Date:   Thu, 13 Jul 2023 09:32:02 -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 v3 3/8] x86/resctrl: Add a new node-scoped resource to rdt_resources_all[]

Add a placeholder in the array of struct rdt_hw_resource to be used
for event monitoring of systems with Sub-NUMA Cluster enabled.

Update get_domain_id() to handle SCOPE_NODE.

Signed-off-by: Tony Luck <tony.luck@...el.com>
Reviewed-by: Peter Newman <peternewman@...gle.com>
---
 arch/x86/kernel/cpu/resctrl/internal.h |  4 +++-
 arch/x86/kernel/cpu/resctrl/core.c     | 12 ++++++++++++
 2 files changed, 15 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/resctrl/internal.h
index 8275b8a74f7e..243017096ddf 100644
--- a/arch/x86/kernel/cpu/resctrl/internal.h
+++ b/arch/x86/kernel/cpu/resctrl/internal.h
@@ -435,6 +435,7 @@ enum resctrl_res_level {
 	RDT_RESOURCE_L2,
 	RDT_RESOURCE_MBA,
 	RDT_RESOURCE_SMBA,
+	RDT_RESOURCE_NODE,
 
 	/* Must be the last */
 	RDT_NUM_RESOURCES,
@@ -442,7 +443,8 @@ enum resctrl_res_level {
 
 enum resctrl_scope {
 	SCOPE_L2_CACHE = 2,
-	SCOPE_L3_CACHE = 3
+	SCOPE_L3_CACHE = 3,
+	SCOPE_NODE,
 };
 
 static inline struct rdt_resource *resctrl_inc(struct rdt_resource *res)
diff --git a/arch/x86/kernel/cpu/resctrl/core.c b/arch/x86/kernel/cpu/resctrl/core.c
index 6571514752f3..e4bd3072927c 100644
--- a/arch/x86/kernel/cpu/resctrl/core.c
+++ b/arch/x86/kernel/cpu/resctrl/core.c
@@ -112,6 +112,16 @@ struct rdt_hw_resource rdt_resources_all[] = {
 			.fflags			= RFTYPE_RES_MB,
 		},
 	},
+	[RDT_RESOURCE_NODE] =
+	{
+		.r_resctrl = {
+			.rid			= RDT_RESOURCE_NODE,
+			.name			= "L3",
+			.scope			= SCOPE_NODE,
+			.domains		= domain_init(RDT_RESOURCE_NODE),
+			.fflags			= 0,
+		},
+	},
 };
 
 /*
@@ -489,6 +499,8 @@ static int arch_domain_mbm_alloc(u32 num_rmid, struct rdt_hw_domain *hw_dom)
 
 static int get_domain_id(int cpu, enum resctrl_scope scope)
 {
+	if (scope == SCOPE_NODE)
+		return cpu_to_node(cpu);
 	return get_cpu_cacheinfo_id(cpu, scope);
 }
 
-- 
2.40.1