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>
---
 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 058a940c3239..b8a3a11b970d 100644
--- a/include/linux/resctrl.h
+++ b/include/linux/resctrl.h
@@ -170,6 +170,7 @@ 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 cee8b87566fa..0f2b5ee429b0 100644
--- a/arch/x86/kernel/cpu/resctrl/core.c
+++ b/arch/x86/kernel/cpu/resctrl/core.c
@@ -502,6 +502,8 @@ 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

Hi Tony,

On 11/9/2023 3:09 PM, Tony Luck wrote:
> 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>
> ---

Please follow guidance in section "Ordering of commit tags" from
Documentation/process/maintainer-tip.rst

With that addressed (thus adding Reviewed-by tags after your 
author SOB):
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>

Reinette