[PATCH v3 20/26] x86/resctrl: Add and initialize rdt_resource for package scope core monitor

Tony Luck
2025-04-07T23:41:00Z

Counts for each Intel telemetry event are periodically sent to one or
more aggregators on each package where accumulated totals are made
available in MMIO registers.

Add a new resource for monitoring these events with code to build
domains at the package granularity.

Signed-off-by: Tony Luck <tony.luck@intel.com>
---
include/linux/resctrl.h | 1 +
arch/x86/kernel/cpu/resctrl/core.c | 11 +++++++++++
2 files changed, 12 insertions(+)

diff --git a/include/linux/resctrl.h b/include/linux/resctrl.h
index 25f51a57b0b7..c03e7dc1f009 100644
--- a/include/linux/resctrl.h
+++ b/include/linux/resctrl.h
@@ -232,6 +232,7 @@ enum resctrl_scope {
RESCTRL_L2_CACHE = 2,
RESCTRL_L3_CACHE = 3,
RESCTRL_L3_NODE,
+ RESCTRL_PACKAGE,
};

/**
diff --git a/arch/x86/kernel/cpu/resctrl/core.c b/arch/x86/kernel/cpu/resctrl/core.c
index f0f256a5ac66..9578d9c7260c 100644
--- a/arch/x86/kernel/cpu/resctrl/core.c
+++ b/arch/x86/kernel/cpu/resctrl/core.c
@@ -99,6 +99,15 @@ struct rdt_hw_resource rdt_resources_all[RDT_NUM_RESOURCES] = {
.schema_fmt = RESCTRL_SCHEMA_RANGE,
},
},
+ [RDT_RESOURCE_PERF_PKG] =
+ {
+ .r_resctrl = {
+ .rid = RDT_RESOURCE_PERF_PKG,
+ .name = "PERF_PKG",
+ .mon_scope = RESCTRL_PACKAGE,
+ .mon_domains = mon_domain_init(RDT_RESOURCE_PERF_PKG),
+ },
+ },
};

u32 resctrl_arch_system_num_rmid_idx(void)
@@ -431,6 +440,8 @@ static int get_domain_id_from_scope(int cpu, enum resctrl_scope scope)
return get_cpu_cacheinfo_id(cpu, scope);
case RESCTRL_L3_NODE:
return cpu_to_node(cpu);
+ case RESCTRL_PACKAGE:
+ return topology_physical_package_id(cpu);
default:
break;
}
--
2.48.1