linux-kernel - [PATCH v2 5/7] perf intel-pt: Process options for PEBS event synthesis

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Message-Id: <20190731135829.54435-6-alexander.shishkin@linux.intel.com>
Date:   Wed, 31 Jul 2019 16:58:27 +0300
From:   Alexander Shishkin <alexander.shishkin@...ux.intel.com>
To:     Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:     Arnaldo Carvalho de Melo <acme@...hat.com>,
        Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org,
        kan.liang@...ux.intel.com, Adrian Hunter <adrian.hunter@...el.com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Subject: [PATCH v2 5/7] perf intel-pt: Process options for PEBS event synthesis

From: Adrian Hunter <adrian.hunter@...el.com>

Process synth_opts.other_events and attr.aux_source to set up for
synthesizing PEBs via Intel PT events.

Signed-off-by: Adrian Hunter <adrian.hunter@...el.com>
Signed-off-by: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
---
 tools/perf/arch/x86/util/intel-pt.c | 23 +++++++++++++++++++++++
 tools/perf/util/intel-pt.c          | 18 ++++++++++++++++++
 2 files changed, 41 insertions(+)

diff --git a/tools/perf/arch/x86/util/intel-pt.c b/tools/perf/arch/x86/util/intel-pt.c
index 609088c01e3a..c92ece8af3b8 100644
--- a/tools/perf/arch/x86/util/intel-pt.c
+++ b/tools/perf/arch/x86/util/intel-pt.c
@@ -548,6 +548,26 @@ static int intel_pt_validate_config(struct perf_pmu *intel_pt_pmu,
 					evsel->attr.config);
 }
 
+/*
+ * Currently, there is not enough information to disambiguate different PEBS
+ * events, so only allow one.
+ */
+static bool intel_pt_too_many_aux_source(struct perf_evlist *evlist)
+{
+	struct perf_evsel *evsel;
+	int aux_source_cnt = 0;
+
+	evlist__for_each_entry(evlist, evsel)
+		aux_source_cnt += !!evsel->attr.aux_source;
+
+	if (aux_source_cnt > 1) {
+		pr_err(INTEL_PT_PMU_NAME " supports at most one event with aux-source\n");
+		return true;
+	}
+
+	return false;
+}
+
 static int intel_pt_recording_options(struct auxtrace_record *itr,
 				      struct perf_evlist *evlist,
 				      struct record_opts *opts)
@@ -588,6 +608,9 @@ static int intel_pt_recording_options(struct auxtrace_record *itr,
 		return -EINVAL;
 	}
 
+	if (intel_pt_too_many_aux_source(evlist))
+		return -EINVAL;
+
 	if (!opts->full_auxtrace)
 		return 0;
 
diff --git a/tools/perf/util/intel-pt.c b/tools/perf/util/intel-pt.c
index df061599fef4..587a2dfb416b 100644
--- a/tools/perf/util/intel-pt.c
+++ b/tools/perf/util/intel-pt.c
@@ -2894,6 +2894,22 @@ static int intel_pt_synth_events(struct intel_pt *pt,
 	return 0;
 }
 
+static void intel_pt_setup_pebs_events(struct intel_pt *pt)
+{
+	struct perf_evsel *evsel;
+
+	if (!pt->synth_opts.other_events)
+		return;
+
+	evlist__for_each_entry(pt->session->evlist, evsel) {
+		if (evsel->attr.aux_source && evsel->id) {
+			pt->sample_pebs = true;
+			pt->pebs_evsel = evsel;
+			return;
+		}
+	}
+}
+
 static struct perf_evsel *intel_pt_find_sched_switch(struct perf_evlist *evlist)
 {
 	struct perf_evsel *evsel;
@@ -3263,6 +3279,8 @@ int intel_pt_process_auxtrace_info(union perf_event *event,
 	if (err)
 		goto err_delete_thread;
 
+	intel_pt_setup_pebs_events(pt);
+
 	err = auxtrace_queues__process_index(&pt->queues, session);
 	if (err)
 		goto err_delete_thread;
-- 
2.20.1