perf tools: Add support for parsing PERF_SAMPLE_READ sample type

Adding support to parse out the PERF_SAMPLE_READ sample bits.  The code
contains both single and group format specification.

This code parse out and prepare PERF_SAMPLE_READ data into the
perf_sample struct. It will be used for group leader sampling feature
comming in shortly.

Signed-off-by: Jiri Olsa <jolsa@redhat.com>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/n/tip-0tgdoln5rwk3wocshb442cl3@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 28 insertions, 2 deletions

diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
index 8bed0c1a1399..9ab8fff74e30 100644
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c
@@ -1096,8 +1096,34 @@ int perf_evsel__parse_sample(struct perf_evsel *evsel, union perf_event *event,
         }
 
         if (type & PERF_SAMPLE_READ) {
-                fprintf(stderr, "PERF_SAMPLE_READ is unsupported for now\n");
-                return -1;
+                u64 read_format = evsel->attr.read_format;
+
+                if (read_format & PERF_FORMAT_GROUP)
+                        data->read.group.nr = *array;
+                else
+                        data->read.one.value = *array;
+
+                array++;
+
+                if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) {
+                        data->read.time_enabled = *array;
+                        array++;
+                }
+
+                if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING) {
+                        data->read.time_running = *array;
+                        array++;
+                }
+
+                /* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */
+                if (read_format & PERF_FORMAT_GROUP) {
+                        data->read.group.values = (struct sample_read_value *) array;
+                        array = (void *) array + data->read.group.nr *
+                                sizeof(struct sample_read_value);
+                } else {
+                        data->read.one.id = *array;
+                        array++;
+                }
         }
 
         if (type & PERF_SAMPLE_CALLCHAIN) {