perf test: Add test of libpfm4 events

$ ./perf test -v 102
102: perf all libpfm4 events test :
--- start ---
test child forked, pid 3030994
Testing ix86arch::UNHALTED_CORE_CYCLES
Testing ix86arch::INSTRUCTION_RETIRED
Testing ix86arch::UNHALTED_REFERENCE_CYCLES
Testing ix86arch::LLC_REFERENCES
Testing ix86arch::LLC_MISSES
Testing ix86arch::BRANCH_INSTRUCTIONS_RETIRED
Testing ix86arch::MISPREDICTED_BRANCH_RETIRED
Testing perf_raw::r0000
Testing icl::UNHALTED_CORE_CYCLES
Testing icl::UNHALTED_REFERENCE_CYCLES
...
test child finished with 0
---- end ----
perf all libpfm4 events test: Ok

Signed-off-by: Ian Rogers <[e-mail]>
Cc: Adrian Hunter <[e-mail]>
Cc: Ingo Molnar <[e-mail]>
Cc: Jiri Olsa <[e-mail]>
Cc: Peter Zijlstra <[e-mail]>
Cc: Stephane Eranian <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Namhyung Kim <[e-mail]>
Signed-off-by: Arnaldo Carvalho de Melo <[e-mail]>

tools/perf/tests/shell/stat_all_pfm.sh

···
+#!/bin/sh
+# perf all libpfm4 events test
+# SPDX-License-Identifier: GPL-2.0
+
+if perf version --build-options | grep HAVE_LIBPFM | grep -q OFF
+then
+  echo "Skipping, no libpfm4 support"
+  exit 2
+fi
+
+err=0
+for p in $(perf list --raw-dump pfm)
+do
+  if echo "$p" | grep -q unc_
+  then
+    echo "Skipping uncore event '$p' that may require additional options."
+    continue
+  fi
+  echo "Testing $p"
+  result=$(perf stat --pfm-events "$p" true 2>&1)
+  x=$?
+  if echo "$result" | grep -q "failed to parse event $p : invalid or missing unit mask"
+  then
+    continue
+  fi
+  if test "$x" -ne "0"
+  then
+    echo "Unexpected exit code '$x'"
+    err=1
+  fi
+  if ! echo "$result" | grep -q "$p" && ! echo "$result" | grep -q "<not supported>"
+  then
+    # We failed to see the event and it is supported. Possibly the workload was
+    # too small so retry with something longer.
+    result=$(perf stat --pfm-events "$p" perf bench internals synthesize 2>&1)
+    x=$?
+    if test "$x" -ne "0"
+    then
+      echo "Unexpected exit code '$x'"
+      err=1
+    fi
+    if ! echo "$result" | grep -q "$p"
+    then
+      echo "Event '$p' not printed in:"
+      echo "$result"
+      err=1
+    fi
+  fi
+done
+
+exit "$err"