perf intel-pt: Add decoder flags for trace begin / end

Previously, the decoder would indicate begin / end by a branch from / to
zero. That hides useful information, in particular when a trace ends
with a call. To prepare for remedying that, add Intel PT decoder flags
for trace begin / end and map them to the existing sample flags.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Link: http://lkml.kernel.org/r/20180920130048.31432-6-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

2 files changed, 7 insertions, 0 deletions

diff --git a/tools/perf/util/intel-pt-decoder/intel-pt-decoder.h b/tools/perf/util/intel-pt-decoder/intel-pt-decoder.h
index 51c18d67f4ca..ed088d4726ba 100644
--- a/tools/perf/util/intel-pt-decoder/intel-pt-decoder.h
+++ b/tools/perf/util/intel-pt-decoder/intel-pt-decoder.h
@@ -37,6 +37,8 @@ enum intel_pt_sample_type {
         INTEL_PT_EX_STOP        = 1 << 6,
         INTEL_PT_PWR_EXIT       = 1 << 7,
         INTEL_PT_CBR_CHG        = 1 << 8,
+        INTEL_PT_TRACE_BEGIN    = 1 << 9,
+        INTEL_PT_TRACE_END      = 1 << 10,
 };
 
 enum intel_pt_period_type {
diff --git a/tools/perf/util/intel-pt.c b/tools/perf/util/intel-pt.c
index aec68908d604..48c1d415c6b0 100644
--- a/tools/perf/util/intel-pt.c
+++ b/tools/perf/util/intel-pt.c
@@ -908,6 +908,11 @@ static void intel_pt_sample_flags(struct intel_pt_queue *ptq)
                 ptq->insn_len = ptq->state->insn_len;
                 memcpy(ptq->insn, ptq->state->insn, INTEL_PT_INSN_BUF_SZ);
         }
+
+        if (ptq->state->type & INTEL_PT_TRACE_BEGIN)
+                ptq->flags |= PERF_IP_FLAG_TRACE_BEGIN;
+        if (ptq->state->type & INTEL_PT_TRACE_END)
+                ptq->flags |= PERF_IP_FLAG_TRACE_END;
 }
 
 static int intel_pt_setup_queue(struct intel_pt *pt,