perf tests kallsyms: Add basic kallsyms test

Add test that kallsyms finds a well known symbol and fails for
another.

Signed-off-by: Ian Rogers <irogers@google.com>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>

diff --git a/tools/perf/tests/shell/kallsyms.sh b/tools/perf/tests/shell/kallsyms.sh
new file mode 100755 (executable)
index 0000000..d0eb997
--- /dev/null
+++ b/tools/perf/tests/shell/kallsyms.sh
@@ -0,0 +1,56 @@
+#!/bin/bash
+# perf kallsyms tests
+# SPDX-License-Identifier: GPL-2.0
+
+err=0
+
+test_kallsyms() {
+       echo "Basic perf kallsyms test"
+
+       # Check if /proc/kallsyms is readable
+       if [ ! -r /proc/kallsyms ]; then
+               echo "Basic perf kallsyms test [Skipped: /proc/kallsyms not readable]"
+               err=2
+               return
+       fi
+
+       # Use a symbol that is definitely a function and present in all kernels, e.g. schedule
+       symbol="schedule"
+
+       # Run perf kallsyms
+       # It prints "address symbol_name"
+       output=$(perf kallsyms $symbol 2>&1)
+       ret=$?
+
+       if [ $ret -ne 0 ] || [ -z "$output" ]; then
+               # If empty or failed, it might be due to permissions (kptr_restrict)
+               # Check if we can grep the symbol from /proc/kallsyms directly
+               if grep -q "$symbol" /proc/kallsyms 2>/dev/null; then
+                       # If it's in /proc/kallsyms but perf kallsyms returned empty/error,
+                       # it likely means perf couldn't parse it or access it correctly (e.g. kptr_restrict=2).
+                       echo "Basic perf kallsyms test [Skipped: $symbol found in /proc/kallsyms but perf kallsyms failed (output: '$output')]"
+                       err=2
+                       return
+               else
+                       echo "Basic perf kallsyms test [Skipped: $symbol not found in /proc/kallsyms]"
+                       err=2
+                       return
+               fi
+       fi
+
+       if echo "$output" | grep -q "not found"; then
+               echo "Basic perf kallsyms test [Failed: output '$output' does not contain $symbol]"
+               err=1
+               return
+       fi
+
+       if perf kallsyms ErlingHaaland | grep -vq "not found"; then
+               echo "Basic perf kallsyms test [Failed: ErlingHaaland found in the output]"
+               err=1
+               return
+       fi
+       echo "Basic perf kallsyms test [Success]"
+}
+
+test_kallsyms
+exit $err