perf tools: Add kernel AUX area sampling definitions

Add kernel AUX area sampling definitions, which brings perf_event.h into
line with the kernel version.

New sample type PERF_SAMPLE_AUX requests a sample of the AUX area
buffer.  New perf_event_attr member 'aux_sample_size' specifies the
desired size of the sample.

Also add support for parsing samples containing AUX area data i.e.
PERF_SAMPLE_AUX.

Committer notes:

I squashed the first two patches in this series to avoid breaking
automatic bisection, i.e. after applying only the original first patch
in this series we would have:

  # perf test -v parsing
  26: Sample parsing                                        :
  --- start ---
  test child forked, pid 17018
  sample format has changed, some new PERF_SAMPLE_ bit was introduced - test needs updating
  test child finished with -1
  ---- end ----
  Sample parsing: FAILED!
  #

With the two paches combined:

  # perf test parsing
  26: Sample parsing                                        : Ok
  #

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Link: http://lore.kernel.org/lkml/20191115124225.5247-3-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 13 insertions, 0 deletions

diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
index 1bf60f325608..772f4879c492 100644
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c
@@ -2209,6 +2209,19 @@ int perf_evsel__parse_sample(struct evsel *evsel, union perf_event *event,
 		array++;
 	}
 
+	if (type & PERF_SAMPLE_AUX) {
+		OVERFLOW_CHECK_u64(array);
+		sz = *array++;
+
+		OVERFLOW_CHECK(array, sz, max_size);
+		/* Undo swap of data */
+		if (swapped)
+			mem_bswap_64((char *)array, sz);
+		data->aux_sample.size = sz;
+		data->aux_sample.data = (char *)array;
+		array = (void *)array + sz;
+	}
+
 	return 0;
 }