perf intel-pt: Fix MTC timing after overflow

On some platforms, overflows will clear before MTC wraparound, and there
is no following TSC/TMA packet. In that case the previous TMA is valid.
Since there will be a valid TMA either way, stop setting 'have_tma' to
false upon overflow.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: stable@vger.kernel.org
Link: http://lkml.kernel.org/r/1527762225-26024-4-git-send-email-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/util/intel-pt-decoder/intel-pt-decoder.c b/tools/perf/util/intel-pt-decoder/intel-pt-decoder.c
index e5eb9177738310ab6645d17b1753154cea1f8b07..881d7c5e5e2a3c8114eaccb9524c16f7494482aa 100644 (file)
--- a/tools/perf/util/intel-pt-decoder/intel-pt-decoder.c
+++ b/tools/perf/util/intel-pt-decoder/intel-pt-decoder.c
@@ -1376,7 +1376,6 @@ static int intel_pt_overflow(struct intel_pt_decoder *decoder)
 {
        intel_pt_log("ERROR: Buffer overflow\n");
        intel_pt_clear_tx_flags(decoder);
-       decoder->have_tma = false;
        decoder->cbr = 0;
        decoder->timestamp_insn_cnt = 0;
        decoder->pkt_state = INTEL_PT_STATE_ERR_RESYNC;