linux-kernel - [PATCH v5 1/2] perf scripting python: Expose dso and map information

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Date:   Sun, 15 May 2022 15:18:37 +0800
From:   Leo Yan <leo.yan@...aro.org>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        James Clark <james.clark@....com>,
        German Gomez <german.gomez@....com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Ian Rogers <irogers@...gle.com>,
        Eelco Chaudron <echaudro@...hat.com>,
        Stephen Brennan <stephen.s.brennan@...cle.com>,
        Tanmay Jagdale <tanmay@...vell.com>,
        "zengshun . wu" <zengshun.wu@...look.com>,
        Al Grant <al.grant@....com>, coresight@...ts.linaro.org,
        linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org
Cc:     Leo Yan <leo.yan@...aro.org>
Subject: [PATCH v5 1/2] perf scripting python: Expose dso and map information

This change adds dso build_id and corresponding map's start and end
address.  The info of dso build_id can be used to find dso file path,
and we can validate if a branch address falls into the range of map's
start and end addresses.

In addition, the map's start address can be used as an offset for
disassembly.

Signed-off-by: Leo Yan <leo.yan@...aro.org>
---
 .../scripting-engines/trace-event-python.c    | 21 +++++++++++++++----
 1 file changed, 17 insertions(+), 4 deletions(-)

diff --git a/tools/perf/util/scripting-engines/trace-event-python.c b/tools/perf/util/scripting-engines/trace-event-python.c
index 659eb4e4b34b..adba01b7d9dd 100644
--- a/tools/perf/util/scripting-engines/trace-event-python.c
+++ b/tools/perf/util/scripting-engines/trace-event-python.c
@@ -755,12 +755,22 @@ static void set_regs_in_dict(PyObject *dict,
 }
 
 static void set_sym_in_dict(PyObject *dict, struct addr_location *al,
-			    const char *dso_field, const char *sym_field,
-			    const char *symoff_field)
+			    const char *dso_field, const char *dso_bid_field,
+			    const char *dso_map_start, const char *dso_map_end,
+			    const char *sym_field, const char *symoff_field)
 {
+	char sbuild_id[SBUILD_ID_SIZE];
+
 	if (al->map) {
 		pydict_set_item_string_decref(dict, dso_field,
 			_PyUnicode_FromString(al->map->dso->name));
+		build_id__sprintf(&al->map->dso->bid, sbuild_id);
+		pydict_set_item_string_decref(dict, dso_bid_field,
+			_PyUnicode_FromString(sbuild_id));
+		pydict_set_item_string_decref(dict, dso_map_start,
+			PyLong_FromUnsignedLong(al->map->start));
+		pydict_set_item_string_decref(dict, dso_map_end,
+			PyLong_FromUnsignedLong(al->map->end));
 	}
 	if (al->sym) {
 		pydict_set_item_string_decref(dict, sym_field,
@@ -840,7 +850,8 @@ static PyObject *get_perf_sample_dict(struct perf_sample *sample,
 			(const char *)sample->raw_data, sample->raw_size));
 	pydict_set_item_string_decref(dict, "comm",
 			_PyUnicode_FromString(thread__comm_str(al->thread)));
-	set_sym_in_dict(dict, al, "dso", "symbol", "symoff");
+	set_sym_in_dict(dict, al, "dso", "dso_bid", "dso_map_start", "dso_map_end",
+			"symbol", "symoff");
 
 	pydict_set_item_string_decref(dict, "callchain", callchain);
 
@@ -856,7 +867,9 @@ static PyObject *get_perf_sample_dict(struct perf_sample *sample,
 	if (addr_al) {
 		pydict_set_item_string_decref(dict_sample, "addr_correlates_sym",
 			PyBool_FromLong(1));
-		set_sym_in_dict(dict_sample, addr_al, "addr_dso", "addr_symbol", "addr_symoff");
+		set_sym_in_dict(dict_sample, addr_al, "addr_dso", "addr_dso_bid",
+				"addr_dso_map_start", "addr_dso_map_end",
+				"addr_symbol", "addr_symoff");
 	}
 
 	if (sample->flags)
-- 
2.25.1