perf intel-pt: Process options for PEBS event synthesis

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>

1 files changed, 23 insertions, 0 deletions

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;