[PATCH v1] perf test: Add cputype testing to perf stat

[Ian Rogers <irogers@google.com>]

Check a bogus PMU fails and that a known PMU succeeds. Limit to PMUs
known cpu, cpu_atom and armv8_pmuv3_0 ones.

Signed-off-by: Ian Rogers <irogers@google.com>
---
 tools/perf/tests/shell/stat.sh | 44 ++++++++++++++++++++++++++++++++++
 1 file changed, 44 insertions(+)

diff --git a/tools/perf/tests/shell/stat.sh b/tools/perf/tests/shell/stat.sh
index b154fbb15d54..3f1e67795490 100755
--- a/tools/perf/tests/shell/stat.sh
+++ b/tools/perf/tests/shell/stat.sh
@@ -103,10 +103,54 @@ test_topdown_weak_groups() {
   echo "Topdown weak groups test [Success]"
 }
 
+test_cputype() {
+  # Test --cputype argument.
+  echo "cputype test"
+
+  # Bogus PMU should fail.
+  if perf stat --cputype="123" -e instructions true > /dev/null 2>&1
+  then
+    echo "cputype test [Bogus PMU didn't fail]"
+    err=1
+    return
+  fi
+
+  # Find a known PMU for cputype.
+  pmu=""
+  for i in cpu cpu_atom armv8_pmuv3_0
+  do
+    if test -d "/sys/devices/$i"
+    then
+      pmu="$i"
+      break
+    fi
+    if perf stat -e "$i/instructions/" true > /dev/null 2>&1
+    then
+      pmu="$i"
+      break
+    fi
+  done
+  if test "x$pmu" = "x"
+  then
+    echo "cputype test [Skipped known PMU not found]"
+    return
+  fi
+
+  # Test running with cputype produces output.
+  if ! perf stat --cputype="$pmu" -e instructions true 2>&1 | grep -E -q "instructions"
+  then
+    echo "cputype test [Failed count missed with given filter]"
+    err=1
+    return
+  fi
+  echo "cputype test [Success]"
+}
+
 test_default_stat
 test_stat_record_report
 test_stat_record_script
 test_stat_repeat_weak_groups
 test_topdown_groups
 test_topdown_weak_groups
+test_cputype
 exit $err
-- 
2.40.1.606.ga4b1b128d6-goog