linux-kernel - [RFC PATCH 6/6] perf cs-etm: Add warnings for missing DSOs

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Message-Id: <20210729155805.2830-7-james.clark@arm.com>
Date:   Thu, 29 Jul 2021 16:58:05 +0100
From:   James Clark <james.clark@....com>
To:     acme@...nel.org, mathieu.poirier@...aro.org,
        coresight@...ts.linaro.org, linux-perf-users@...r.kernel.org
Cc:     leo.yan@...aro.org, suzuki.poulose@....com, mike.leach@...aro.org,
        James Clark <james.clark@....com>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        John Garry <john.garry@...wei.com>,
        Will Deacon <will@...nel.org>, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: [RFC PATCH 6/6] perf cs-etm: Add warnings for missing DSOs

Currently decode will silently fail if no binary data is available for
the decode. This is made worse if only partial data is available because
the decode will appear to work, but any trace from that missing DSO will
silently not be generated.

Add a UI popup once if there is any data missing, and then warn in the
bottom left for each individual DSO that's missing.

Signed-off-by: James Clark <james.clark@....com>
---
 tools/perf/util/cs-etm.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/tools/perf/util/cs-etm.c b/tools/perf/util/cs-etm.c
index 32ad92d3e454..e6851260d059 100644
--- a/tools/perf/util/cs-etm.c
+++ b/tools/perf/util/cs-etm.c
@@ -746,8 +746,16 @@ static u32 cs_etm__mem_access(struct cs_etm_queue *etmq, u8 trace_chan_id,
 
 	len = dso__data_read_offset(al.map->dso, machine, offset, buffer, size);
 
-	if (len <= 0)
+	if (len <= 0) {
+		ui__warning_once("CS ETM Trace: Missing DSO. Use 'perf archive' to export data from the traced system.\n");
+		if (!al.map->dso->auxtrace_warned) {
+			pr_err("CS ETM Trace: Debug data not found for address %#"PRIx64" in %s\n",
+				    address,
+				    al.map->dso->long_name ? al.map->dso->long_name : "Unknown");
+			al.map->dso->auxtrace_warned = true;
+		}
 		return 0;
+	}
 
 	return len;
 }
-- 
2.28.0