From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 95E4CFBEA for ; Mon, 15 May 2023 17:05:32 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id E04B3C433EF; Mon, 15 May 2023 17:05:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1684170332; bh=MrpB9z0J6gO/McZWH9KQ5LiAs8arGJOOrHoF9cZXNEI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=2jGKkFLYpZXH1kRuzg/z2JBxdYXABDMNZsoGOPaFRUBLm8UhuAuDtiBpSXwUde4xj dkXJB8TxnQ2zCiIvZpuejabQPbVh5avS8f/xgDrMrNhHT05Uzc4x2C9pHiXMsn6kiN v/4QyLw8fiB9Yg3/gHqbDh07uOinMGXPUIn/aD68= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Yang Shi , James Clark , Adrian Hunter , Alexander Shishkin , Ian Rogers , Ingo Molnar , Jiri Olsa , John Garry , Leo Yan , Mark Rutland , Mathieu Poirier , Mike Leach , Namhyung Kim , Peter Zijlstra , Suzuki Poulouse , Will Deacon , coresight@lists.linaro.org, denik@google.com, linux-arm-kernel@lists.infradead.org, Arnaldo Carvalho de Melo , Sasha Levin Subject: [PATCH 6.1 098/239] perf cs-etm: Fix timeless decode mode detection Date: Mon, 15 May 2023 18:26:01 +0200 Message-Id: <20230515161724.617421950@linuxfoundation.org> X-Mailer: git-send-email 2.40.1 In-Reply-To: <20230515161721.545370111@linuxfoundation.org> References: <20230515161721.545370111@linuxfoundation.org> User-Agent: quilt/0.67 Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit From: James Clark [ Upstream commit 449067f3fc9f340da54e383738286881e6634d0b ] In this context, timeless refers to the trace data rather than the perf event data. But when detecting whether there are timestamps in the trace data or not, the presence of a timestamp flag on any perf event is used. Since commit f42c0ce573df ("perf record: Always get text_poke events with --kcore option") timestamps were added to a tracking event when --kcore is used which breaks this detection mechanism. Fix it by detecting if trace timestamps exist by looking at the ETM config flags. This would have always been a more accurate way of doing it anyway. This fixes the following error message when using --kcore with Coresight: $ perf record --kcore -e cs_etm// --per-thread $ perf report The perf.data/data data has no samples! Fixes: f42c0ce573df79d1 ("perf record: Always get text_poke events with --kcore option") Reported-by: Yang Shi Signed-off-by: James Clark Cc: Adrian Hunter Cc: Alexander Shishkin Cc: Ian Rogers Cc: Ingo Molnar Cc: Jiri Olsa Cc: John Garry Cc: Leo Yan Cc: Mark Rutland Cc: Mathieu Poirier Cc: Mike Leach Cc: Namhyung Kim Cc: Peter Zijlstra Cc: Suzuki Poulouse Cc: Will Deacon Cc: coresight@lists.linaro.org Cc: denik@google.com Cc: linux-arm-kernel@lists.infradead.org Link: https://lore.kernel.org/lkml/CAHbLzkrJQTrYBtPkf=jf3OpQ-yBcJe7XkvQstX9j2frz4WF-SQ@mail.gmail.com/ Link: https://lore.kernel.org/r/20230424134748.228137-2-james.clark@arm.com Signed-off-by: Arnaldo Carvalho de Melo Signed-off-by: Sasha Levin --- tools/perf/util/cs-etm.c | 30 ++++++++++++++++++------------ 1 file changed, 18 insertions(+), 12 deletions(-) diff --git a/tools/perf/util/cs-etm.c b/tools/perf/util/cs-etm.c index 16db965ac995e..09e240e4477d0 100644 --- a/tools/perf/util/cs-etm.c +++ b/tools/perf/util/cs-etm.c @@ -2488,26 +2488,29 @@ static int cs_etm__process_auxtrace_event(struct perf_session *session, return 0; } -static bool cs_etm__is_timeless_decoding(struct cs_etm_auxtrace *etm) +static int cs_etm__setup_timeless_decoding(struct cs_etm_auxtrace *etm) { struct evsel *evsel; struct evlist *evlist = etm->session->evlist; - bool timeless_decoding = true; /* Override timeless mode with user input from --itrace=Z */ - if (etm->synth_opts.timeless_decoding) - return true; + if (etm->synth_opts.timeless_decoding) { + etm->timeless_decoding = true; + return 0; + } /* - * Circle through the list of event and complain if we find one - * with the time bit set. + * Find the cs_etm evsel and look at what its timestamp setting was */ - evlist__for_each_entry(evlist, evsel) { - if ((evsel->core.attr.sample_type & PERF_SAMPLE_TIME)) - timeless_decoding = false; - } + evlist__for_each_entry(evlist, evsel) + if (cs_etm__evsel_is_auxtrace(etm->session, evsel)) { + etm->timeless_decoding = + !(evsel->core.attr.config & BIT(ETM_OPT_TS)); + return 0; + } - return timeless_decoding; + pr_err("CS ETM: Couldn't find ETM evsel\n"); + return -EINVAL; } static const char * const cs_etm_global_header_fmts[] = { @@ -3051,7 +3054,6 @@ int cs_etm__process_auxtrace_info(union perf_event *event, etm->snapshot_mode = (hdr[CS_ETM_SNAPSHOT] != 0); etm->metadata = metadata; etm->auxtrace_type = auxtrace_info->type; - etm->timeless_decoding = cs_etm__is_timeless_decoding(etm); etm->auxtrace.process_event = cs_etm__process_event; etm->auxtrace.process_auxtrace_event = cs_etm__process_auxtrace_event; @@ -3061,6 +3063,10 @@ int cs_etm__process_auxtrace_info(union perf_event *event, etm->auxtrace.evsel_is_auxtrace = cs_etm__evsel_is_auxtrace; session->auxtrace = &etm->auxtrace; + err = cs_etm__setup_timeless_decoding(etm); + if (err) + return err; + etm->unknown_thread = thread__new(999999999, 999999999); if (!etm->unknown_thread) { err = -ENOMEM; -- 2.39.2