From:   Henry Castro <hcvcastro@gmail.com>
To:     namhyung@kernel.org
Cc:     Henry Castro <hcvcastro@gmail.com>,
        Peter Zijlstra <peterz@infradead.org>,
        Ingo Molnar <mingo@redhat.com>,
        Arnaldo Carvalho de Melo <acme@kernel.org>,
        Mark Rutland <mark.rutland@arm.com>,
        Alexander Shishkin <alexander.shishkin@linux.intel.com>,
        Jiri Olsa <jolsa@kernel.org>,
        "Masami Hiramatsu (Google)" <mhiramat@kernel.org>,
        linux-perf-users@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH v3] perf: fix the probe finder location (.dwo files)
Date:   Sun, 29 Jan 2023 19:21:28 -0400
Message-Id: <20230129232145.31307-1-hcvcastro@gmail.com>
In-Reply-To: <Y01Mof9qMpFToRWY@kernel.org>
References: <Y01Mof9qMpFToRWY@kernel.org>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

If the file object is compiled using -gsplit-dwarf,
the probe finder location will fail.

Signed-off-by: Henry Castro <hcvcastro@gmail.com>
---

Hi,

Polite ping?  Any feedback?

Regards
Henry

 tools/perf/util/probe-finder.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/tools/perf/util/probe-finder.c b/tools/perf/util/probe-finder.c
index 50d861a80f57..5f6781e712db 100644
--- a/tools/perf/util/probe-finder.c
+++ b/tools/perf/util/probe-finder.c
@@ -1200,6 +1200,20 @@ static int debuginfo__find_probe_location(struct debuginfo *dbg,
 			continue;
 		}

+#if _ELFUTILS_PREREQ(0, 171)
+		{
+			uint8_t unit_type;
+			Dwarf_Die cudie, subdie;
+
+			/* Check separate debug information file. */
+			if (dwarf_cu_info(pf->cu_die.cu, NULL,
+					  &unit_type, &cudie,
+					  &subdie, NULL,
+					  NULL, NULL) == 0
+			    && unit_type == DW_UT_skeleton)
+				pf->cu_die = subdie;
+		}
+#endif
 		/* Check if target file is included. */
 		if (pp->file)
 			pf->fname = cu_find_realpath(&pf->cu_die, pp->file);
--
2.20.1