linux-kernel - [PATCH 32/63] perf cs-etm: Treat EO_TRACE element as trace discontinuity

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Date:   Tue, 18 Dec 2018 19:07:02 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Ingo Molnar <mingo@...nel.org>
Cc:     Clark Williams <williams@...hat.com>, linux-kernel@...r.kernel.org,
        linux-perf-users@...r.kernel.org, Leo Yan <leo.yan@...aro.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Mike Leach <mike.leach@...aro.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Robert Walker <robert.walker@....com>,
        coresight@...ts.linaro.org, linux-arm-kernel@...ts.infradead.org,
        Arnaldo Carvalho de Melo <acme@...hat.com>
Subject: [PATCH 32/63] perf cs-etm: Treat EO_TRACE element as trace discontinuity

From: Leo Yan <leo.yan@...aro.org>

If the decoder outputs an EO_TRACE element, it means the end of the
trace buffer; this is a discontinuity and in this case the end of trace
data needs to be saved.

This patch generates a CS_ETM_DISCONTINUITY packet for the EO_TRACE
element hereby flushing the end of trace data in cs-etm.c.

Signed-off-by: Leo Yan <leo.yan@...aro.org>
Reviewed-by: Mathieu Poirier <mathieu.poirier@...aro.org>
Cc: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Cc: Jiri Olsa <jolsa@...hat.com>
Cc: Mike Leach <mike.leach@...aro.org>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Robert Walker <robert.walker@....com>
Cc: coresight@...ts.linaro.org
Cc: linux-arm-kernel@...ts.infradead.org
Link: http://lkml.kernel.org/r/1544513908-16805-8-git-send-email-leo.yan@linaro.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/util/cs-etm-decoder/cs-etm-decoder.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/perf/util/cs-etm-decoder/cs-etm-decoder.c b/tools/perf/util/cs-etm-decoder/cs-etm-decoder.c
index bee026e76a4c..cda6f074bd03 100644
--- a/tools/perf/util/cs-etm-decoder/cs-etm-decoder.c
+++ b/tools/perf/util/cs-etm-decoder/cs-etm-decoder.c
@@ -409,6 +409,7 @@ static ocsd_datapath_resp_t cs_etm_decoder__gen_trace_elem_printer(
 	switch (elem->elem_type) {
 	case OCSD_GEN_TRC_ELEM_UNKNOWN:
 		break;
+	case OCSD_GEN_TRC_ELEM_EO_TRACE:
 	case OCSD_GEN_TRC_ELEM_NO_SYNC:
 	case OCSD_GEN_TRC_ELEM_TRACE_ON:
 		resp = cs_etm_decoder__buffer_discontinuity(decoder,
@@ -425,7 +426,6 @@ static ocsd_datapath_resp_t cs_etm_decoder__gen_trace_elem_printer(
 		decoder->packet_buffer[decoder->tail].exc_ret = true;
 		break;
 	case OCSD_GEN_TRC_ELEM_PE_CONTEXT:
-	case OCSD_GEN_TRC_ELEM_EO_TRACE:
 	case OCSD_GEN_TRC_ELEM_ADDR_NACC:
 	case OCSD_GEN_TRC_ELEM_TIMESTAMP:
 	case OCSD_GEN_TRC_ELEM_CYCLE_COUNT:
-- 
2.19.2