fix(telemetry): fix perfmon issues on Arm

To enable perfmon plugin on AArch64, users have to set
kernel/perf_user_access to 1 to allow userspace applications to directly
access PMU counters. Additionally, replace bundle cache-hierarchy with
bundle cache-data as it is the correct bundle name on AArch64.

Signed-off-by: Jay Wang <jay.wang2@arm.com>
Change-Id: I67b86e255c8e62d3672a8f52db88eed3daf6ff59

1 files changed, 7 insertions, 2 deletions

diff --git a/resources/libraries/python/TelemetryUtil.py b/resources/libraries/python/TelemetryUtil.py
index 63d0bf60a7..1dbb2d45a3 100644
--- a/resources/libraries/python/TelemetryUtil.py
+++ b/resources/libraries/python/TelemetryUtil.py
@@ -1,4 +1,4 @@
-# Copyright (c) 2022 Cisco and/or its affiliates.
+# Copyright (c) 2025 Cisco and/or its affiliates.
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
 # You may obtain a copy of the License at:
@@ -16,7 +16,8 @@
 from resources.libraries.python.model.ExportResult import append_telemetry
 from resources.libraries.python.Constants import Constants
 from resources.libraries.python.ssh import exec_cmd_no_error
-from resources.libraries.python.topology import NodeType
+from resources.libraries.python.topology import Topology, NodeType
+from resources.libraries.python.SysctlUtil import SysctlUtil
 
 __all__ = ["TelemetryUtil"]
 
@@ -51,6 +52,10 @@ class TelemetryUtil:
         cd_cmd += f"sh -c \"cd {Constants.REMOTE_FW_DIR}/"
         cd_cmd += f"{Constants.RESOURCES_TOOLS}"
 
+        # Allow userspace to directly access perf counters on aarch64
+        if Topology.get_node_arch(node) == u"aarch64":
+            SysctlUtil.set_sysctl_value(node, u"kernel/perf_user_access", 1)
+
         if spath:
             bin_cmd = f"python3 -m telemetry --config {config} --hook {spath}\""
         else: