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Subject[PATCH 21/28] perf intel-pt: Process options for PEBS event synthesis
Date
From: Adrian Hunter <adrian.hunter@intel.com>

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

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20190806084606.4021-6-alexander.shishkin@linux.intel.com
Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
[ Fixed up libbperf clashes, i.e. some places using perf_evsel (now in libperf)
need to use instead 'evsel' (a tools/perf only abstraction) ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.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 218a4e694618..a8e633aa278a 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->core.attr.config);
}

+/*
+ * Currently, there is not enough information to disambiguate different PEBS
+ * events, so only allow one.
+ */
+static bool intel_pt_too_many_aux_output(struct evlist *evlist)
+{
+ struct evsel *evsel;
+ int aux_output_cnt = 0;
+
+ evlist__for_each_entry(evlist, evsel)
+ aux_output_cnt += !!evsel->core.attr.aux_output;
+
+ if (aux_output_cnt > 1) {
+ pr_err(INTEL_PT_PMU_NAME " supports at most one event with aux-output\n");
+ return true;
+ }
+
+ return false;
+}
+
static int intel_pt_recording_options(struct auxtrace_record *itr,
struct 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_output(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 4c52204868d8..ea504fa9b623 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 evsel *evsel;
+
+ if (!pt->synth_opts.other_events)
+ return;
+
+ evlist__for_each_entry(pt->session->evlist, evsel) {
+ if (evsel->core.attr.aux_output && evsel->id) {
+ pt->sample_pebs = true;
+ pt->pebs_evsel = evsel;
+ return;
+ }
+ }
+}
+
static struct evsel *intel_pt_find_sched_switch(struct evlist *evlist)
{
struct 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;
--
2.21.0
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