linux-kernel - [PATCH v15-RFC 1/8] x86/resctrl: Split the RDT_RESOURCE

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Date: Tue, 30 Jan 2024 14:20:27 -0800
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>,
	Drew Fustini <dfustini@...libre.com>,
	linux-kernel@...r.kernel.org,
	linux-doc@...r.kernel.org,
	patches@...ts.linux.dev,
	Tony Luck <tony.luck@...el.com>
Subject: [PATCH v15-RFC 1/8] x86/resctrl: Split the RDT_RESOURCE_L3 resource

The RDT_RESOURCE_L3 is unique in that it is used for both monitoring
an control functions. This made sense while both uses had the same
scope. But systems with Sub-NUMA clustering enabled do not follow this
pattern.

Create a new resource: RDT_RESOURCE_L3_MON ready to take over the
monitoring functions.

Signed-off-by: Tony Luck <tony.luck@...el.com>
---
 arch/x86/kernel/cpu/resctrl/internal.h |  1 +
 arch/x86/kernel/cpu/resctrl/core.c     | 10 ++++++++++
 2 files changed, 11 insertions(+)

diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/resctrl/internal.h
index 52e7e7deee10..c6051bc70e96 100644
--- a/arch/x86/kernel/cpu/resctrl/internal.h
+++ b/arch/x86/kernel/cpu/resctrl/internal.h
@@ -429,6 +429,7 @@ DECLARE_STATIC_KEY_FALSE(rdt_alloc_enable_key);
 extern struct dentry *debugfs_resctrl;
 
 enum resctrl_res_level {
+	RDT_RESOURCE_L3_MON,
 	RDT_RESOURCE_L3,
 	RDT_RESOURCE_L2,
 	RDT_RESOURCE_MBA,
diff --git a/arch/x86/kernel/cpu/resctrl/core.c b/arch/x86/kernel/cpu/resctrl/core.c
index aa9810a64258..c50f55d7790e 100644
--- a/arch/x86/kernel/cpu/resctrl/core.c
+++ b/arch/x86/kernel/cpu/resctrl/core.c
@@ -60,6 +60,16 @@ mba_wrmsr_amd(struct rdt_domain *d, struct msr_param *m,
 #define domain_init(id) LIST_HEAD_INIT(rdt_resources_all[id].r_resctrl.domains)
 
 struct rdt_hw_resource rdt_resources_all[] = {
+	[RDT_RESOURCE_L3_MON] =
+	{
+		.r_resctrl = {
+			.rid			= RDT_RESOURCE_L3_MON,
+			.name			= "L3",
+			.cache_level		= 3,
+			.domains		= domain_init(RDT_RESOURCE_L3_MON),
+			.fflags			= RFTYPE_RES_CACHE,
+		},
+	},
 	[RDT_RESOURCE_L3] =
 	{
 		.r_resctrl = {
-- 
2.43.0