linux-kernel - [PATCH 5.15 098/124] perf report: Set PERF_SAMPLE_DATA

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20220426081750.085380367@linuxfoundation.org>
Date:   Tue, 26 Apr 2022 10:21:39 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, James Clark <james.clark@....com>,
        Leo Yan <leo.yan@...aro.org>,
        German Gomez <german.gomez@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Ingo Molnar <mingo@...hat.com>, Jiri Olsa <jolsa@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Namhyung Kim <namhyung@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Ravi Bangoria <ravi.bangoria@...ux.ibm.com>,
        Arnaldo Carvalho de Melo <acme@...hat.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.15 098/124] perf report: Set PERF_SAMPLE_DATA_SRC bit for Arm SPE event

From: Leo Yan <leo.yan@...aro.org>

[ Upstream commit ccb17caecfbd542f49a2a79ae088136ba8bfb794 ]

Since commit bb30acae4c4dacfa ("perf report: Bail out --mem-mode if mem
info is not available") "perf mem report" and "perf report --mem-mode"
don't report result if the PERF_SAMPLE_DATA_SRC bit is missed in sample
type.

The commit ffab487052054162 ("perf: arm-spe: Fix perf report
--mem-mode") partially fixes the issue.  It adds PERF_SAMPLE_DATA_SRC
bit for Arm SPE event, this allows the perf data file generated by
kernel v5.18-rc1 or later version can be reported properly.

On the other hand, perf tool still fails to be backward compatibility
for a data file recorded by an older version's perf which contains Arm
SPE trace data.  This patch is a workaround in reporting phase, when
detects ARM SPE PMU event and without PERF_SAMPLE_DATA_SRC bit, it will
force to set the bit in the sample type and give a warning info.

Fixes: bb30acae4c4dacfa ("perf report: Bail out --mem-mode if mem info is not available")
Reviewed-by: James Clark <james.clark@....com>
Signed-off-by: Leo Yan <leo.yan@...aro.org>
Tested-by: German Gomez <german.gomez@....com>
Cc: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Cc: Ingo Molnar <mingo@...hat.com>
Cc: Jiri Olsa <jolsa@...nel.org>
Cc: Mark Rutland <mark.rutland@....com>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Ravi Bangoria <ravi.bangoria@...ux.ibm.com>
Link: https://lore.kernel.org/r/20220414123201.842754-1-leo.yan@linaro.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 tools/perf/builtin-report.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/tools/perf/builtin-report.c b/tools/perf/builtin-report.c
index 997e0a4b0902..6583ad9cc7de 100644
--- a/tools/perf/builtin-report.c
+++ b/tools/perf/builtin-report.c
@@ -349,6 +349,7 @@ static int report__setup_sample_type(struct report *rep)
 	struct perf_session *session = rep->session;
 	u64 sample_type = evlist__combined_sample_type(session->evlist);
 	bool is_pipe = perf_data__is_pipe(session->data);
+	struct evsel *evsel;
 
 	if (session->itrace_synth_opts->callchain ||
 	    session->itrace_synth_opts->add_callchain ||
@@ -403,6 +404,19 @@ static int report__setup_sample_type(struct report *rep)
 	}
 
 	if (sort__mode == SORT_MODE__MEMORY) {
+		/*
+		 * FIXUP: prior to kernel 5.18, Arm SPE missed to set
+		 * PERF_SAMPLE_DATA_SRC bit in sample type.  For backward
+		 * compatibility, set the bit if it's an old perf data file.
+		 */
+		evlist__for_each_entry(session->evlist, evsel) {
+			if (strstr(evsel->name, "arm_spe") &&
+				!(sample_type & PERF_SAMPLE_DATA_SRC)) {
+				evsel->core.attr.sample_type |= PERF_SAMPLE_DATA_SRC;
+				sample_type |= PERF_SAMPLE_DATA_SRC;
+			}
+		}
+
 		if (!is_pipe && !(sample_type & PERF_SAMPLE_DATA_SRC)) {
 			ui__error("Selected --mem-mode but no mem data. "
 				  "Did you call perf record without -d?\n");
-- 
2.35.1