linux-kernel - [tip: x86/cache] x86/resctrl: Add node-scope to the options for feature scope

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Date: Tue, 02 Jul 2024 19:24:15 -0000
From: "tip-bot2 for Tony Luck" <tip-bot2@...utronix.de>
To: linux-tip-commits@...r.kernel.org
Cc: Tony Luck <tony.luck@...el.com>, "Borislav Petkov (AMD)" <bp@...en8.de>,
 Reinette Chatre <reinette.chatre@...el.com>, Babu Moger <babu.moger@....com>,
 x86@...nel.org, linux-kernel@...r.kernel.org
Subject:
 [tip: x86/cache] x86/resctrl: Add node-scope to the options for feature scope

The following commit has been merged into the x86/cache branch of tip:

Commit-ID:     1a171608ee8d40d22d604303e42f033c69151123
Gitweb:        https://git.kernel.org/tip/1a171608ee8d40d22d604303e42f033c69151123
Author:        Tony Luck <tony.luck@...el.com>
AuthorDate:    Fri, 28 Jun 2024 14:56:05 -07:00
Committer:     Borislav Petkov (AMD) <bp@...en8.de>
CommitterDate: Tue, 02 Jul 2024 19:49:54 +02:00

x86/resctrl: Add node-scope to the options for feature scope

Currently supported resctrl features are all domain scoped the same as the
scope of the L2 or L3 caches.

Add RESCTRL_L3_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 divided between
nodes that share an L3 cache.

Signed-off-by: Tony Luck <tony.luck@...el.com>
Signed-off-by: Borislav Petkov (AMD) <bp@...en8.de>
Reviewed-by: Reinette Chatre <reinette.chatre@...el.com>
Tested-by: Babu Moger <babu.moger@....com>
Link: https://lore.kernel.org/r/20240628215619.76401-6-tony.luck@intel.com
---
 arch/x86/kernel/cpu/resctrl/core.c | 2 ++
 include/linux/resctrl.h            | 1 +
 2 files changed, 3 insertions(+)

diff --git a/arch/x86/kernel/cpu/resctrl/core.c b/arch/x86/kernel/cpu/resctrl/core.c
index b4f2be7..b86c525 100644
--- a/arch/x86/kernel/cpu/resctrl/core.c
+++ b/arch/x86/kernel/cpu/resctrl/core.c
@@ -510,6 +510,8 @@ 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_L3_NODE:
+		return cpu_to_node(cpu);
 	default:
 		break;
 	}
diff --git a/include/linux/resctrl.h b/include/linux/resctrl.h
index aa2c22a..64b6ad1 100644
--- a/include/linux/resctrl.h
+++ b/include/linux/resctrl.h
@@ -176,6 +176,7 @@ struct resctrl_schema;
 enum resctrl_scope {
 	RESCTRL_L2_CACHE = 2,
 	RESCTRL_L3_CACHE = 3,
+	RESCTRL_L3_NODE,
 };
 
 /**