From 63ccee6c83e6c8f050c799a081d5a57fdcd2e3a8 Mon Sep 17 00:00:00 2001
From: Ian Rogers <irogers@google.com>
Date: Fri, 13 Dec 2024 18:19:41 -0800
Subject: [PATCH] perf test shell tpebs: Avoid failures with perf event
 paranoia

When not running as root and with higher perf event paranoia values
the perf record forked by TPEBS can fail to attach to the process. Skip
the test in these scenarios.

Signed-off-by: Ian Rogers <irogers@google.com>
---
 .../perf/tests/shell/test_stat_intel_tpebs.sh  | 18 +++++++++++++++++-
 1 file changed, 17 insertions(+), 1 deletion(-)

diff --git a/tools/perf/tests/shell/test_stat_intel_tpebs.sh b/tools/perf/tests/shell/test_stat_intel_tpebs.sh
index f95fc64bf0a7..0de6ce45c40a 100755
--- a/tools/perf/tests/shell/test_stat_intel_tpebs.sh
+++ b/tools/perf/tests/shell/test_stat_intel_tpebs.sh
@@ -3,7 +3,22 @@
 # SPDX-License-Identifier: GPL-2.0
 
 set -e
-grep -q GenuineIntel /proc/cpuinfo || { echo Skipping non-Intel; exit 2; }
+
+ParanoidAndNotRoot() {
+  [ "$(id -u)" != 0 ] && [ "$(cat /proc/sys/kernel/perf_event_paranoid)" -gt $1 ]
+}
+
+if ! grep -q GenuineIntel /proc/cpuinfo
+then
+  echo "Skipping non-Intel"
+  exit 2
+fi
+
+if ParanoidAndNotRoot 0
+then
+  echo "Skipping paranoid >0 and not root"
+  exit 2
+fi
 
 # Use this event for testing because it should exist in all platforms
 event=cache-misses:R
@@ -20,3 +35,4 @@ alt_name=/cache-misses/R
 echo "Testing with --record-tpebs"
 result=$(perf stat -e "$event" --record-tpebs -a sleep 0.01 2>&1)
 [[ "$result" =~ "perf record" && "$result" =~ $event || "$result" =~ $alt_name ]] || exit 1
+echo "Success!"