On 12/4/2023 12:53 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.
>
> Signed-off-by: Tony Luck<tony.luck@intel.com>
> Tested-by: Shaopeng Tan<tan.shaopeng@jp.fujitsu.com>
> Reviewed-by: Peter Newman<peternewman@google.com>
> Reviewed-by: Reinette Chatre<reinette.chatre@intel.com>
> Reviewed-by: Shaopeng Tan<tan.shaopeng@jp.fujitsu.com>
Reviewed-by: Babu Moger <babu.moger@amd.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 797cb3bf417a..c9315ce8f7bd 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;
> }