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>

5 files changed, 112 insertions, 2 deletions

diff --git a/tools/perf/util/event.h b/tools/perf/util/event.h
index 1ebb8fb0178c..6119a649d861 100644
--- a/tools/perf/util/event.h
+++ b/tools/perf/util/event.h
@@ -80,6 +80,23 @@ struct stack_dump {
         char *data;
 };
 
+struct sample_read_value {
+        u64 value;
+        u64 id;
+};
+
+struct sample_read {
+        u64 time_enabled;
+        u64 time_running;
+        union {
+                struct {
+                        u64 nr;
+                        struct sample_read_value *values;
+                } group;
+                struct sample_read_value one;
+        };
+};
+
 struct perf_sample {
         u64 ip;
         u32 pid, tid;
@@ -97,6 +114,7 @@ struct perf_sample {
         struct branch_stack *branch_stack;
         struct regs_dump  user_regs;
         struct stack_dump user_stack;
+        struct sample_read read;
 };
 
 #define PERF_MEM_DATA_SRC_NONE \
diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c
index 0d3b73996255..df77a44fe276 100644
--- a/tools/perf/util/evlist.c
+++ b/tools/perf/util/evlist.c
@@ -676,6 +676,32 @@ u64 perf_evlist__sample_type(struct perf_evlist *evlist)
         return first->attr.sample_type;
 }
 
+bool perf_evlist__valid_read_format(struct perf_evlist *evlist)
+{
+        struct perf_evsel *first = perf_evlist__first(evlist), *pos = first;
+        u64 read_format = first->attr.read_format;
+        u64 sample_type = first->attr.sample_type;
+
+        list_for_each_entry_continue(pos, &evlist->entries, node) {
+                if (read_format != pos->attr.read_format)
+                        return false;
+        }
+
+        /* PERF_SAMPLE_READ imples PERF_FORMAT_ID. */
+        if ((sample_type & PERF_SAMPLE_READ) &&
+            !(read_format & PERF_FORMAT_ID)) {
+                return false;
+        }
+
+        return true;
+}
+
+u64 perf_evlist__read_format(struct perf_evlist *evlist)
+{
+        struct perf_evsel *first = perf_evlist__first(evlist);
+        return first->attr.read_format;
+}
+
 u16 perf_evlist__id_hdr_size(struct perf_evlist *evlist)
 {
         struct perf_evsel *first = perf_evlist__first(evlist);
diff --git a/tools/perf/util/evlist.h b/tools/perf/util/evlist.h
index 0583d36252be..c7178b7b9951 100644
--- a/tools/perf/util/evlist.h
+++ b/tools/perf/util/evlist.h
@@ -118,6 +118,7 @@ int perf_evlist__apply_filters(struct perf_evlist *evlist);
 void __perf_evlist__set_leader(struct list_head *list);
 void perf_evlist__set_leader(struct perf_evlist *evlist);
 
+u64 perf_evlist__read_format(struct perf_evlist *evlist);
 u64 perf_evlist__sample_type(struct perf_evlist *evlist);
 bool perf_evlist__sample_id_all(struct perf_evlist *evlist);
 u16 perf_evlist__id_hdr_size(struct perf_evlist *evlist);
@@ -127,6 +128,7 @@ int perf_evlist__parse_sample(struct perf_evlist *evlist, union perf_event *even
 
 bool perf_evlist__valid_sample_type(struct perf_evlist *evlist);
 bool perf_evlist__valid_sample_id_all(struct perf_evlist *evlist);
+bool perf_evlist__valid_read_format(struct perf_evlist *evlist);
 
 void perf_evlist__splice_list_tail(struct perf_evlist *evlist,
                                    struct list_head *list,
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) {
diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
index 272c9cf57122..f082921a062d 100644
--- a/tools/perf/util/session.c
+++ b/tools/perf/util/session.c
@@ -71,6 +71,11 @@ static int perf_session__open(struct perf_session *self, bool force)
                 goto out_close;
         }
 
+        if (!perf_evlist__valid_read_format(self->evlist)) {
+                pr_err("non matching read_format");
+                goto out_close;
+        }
+
         self->size = input_stat.st_size;
         return 0;
 
@@ -749,6 +754,36 @@ static void perf_session__print_tstamp(struct perf_session *session,
                 printf("%" PRIu64 " ", sample->time);
 }
 
+static void sample_read__printf(struct perf_sample *sample, u64 read_format)
+{
+        printf("... sample_read:\n");
+
+        if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED)
+                printf("...... time enabled %016" PRIx64 "\n",
+                       sample->read.time_enabled);
+
+        if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING)
+                printf("...... time running %016" PRIx64 "\n",
+                       sample->read.time_running);
+
+        if (read_format & PERF_FORMAT_GROUP) {
+                u64 i;
+
+                printf(".... group nr %" PRIu64 "\n", sample->read.group.nr);
+
+                for (i = 0; i < sample->read.group.nr; i++) {
+                        struct sample_read_value *value;
+
+                        value = &sample->read.group.values[i];
+                        printf("..... id %016" PRIx64
+                               ", value %016" PRIx64 "\n",
+                               value->id, value->value);
+                }
+        } else
+                printf("..... id %016" PRIx64 ", value %016" PRIx64 "\n",
+                        sample->read.one.id, sample->read.one.value);
+}
+
 static void dump_event(struct perf_session *session, union perf_event *event,
                        u64 file_offset, struct perf_sample *sample)
 {
@@ -798,6 +833,9 @@ static void dump_sample(struct perf_evsel *evsel, union perf_event *event,
 
         if (sample_type & PERF_SAMPLE_DATA_SRC)
                 printf(" . data_src: 0x%"PRIx64"\n", sample->data_src);
+
+        if (sample_type & PERF_SAMPLE_READ)
+                sample_read__printf(sample, evsel->attr.read_format);
 }
 
 static struct machine *