linux-kernel - [PATCH v2 5/6] perf cs-etm: Treat EO_TRACE element as trace discontinuity

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Date:   Mon, 10 Dec 2018 16:53:00 +0800
From:   Leo Yan <leo.yan@...aro.org>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Coresight ML <coresight@...ts.linaro.org>
Cc:     Leo Yan <leo.yan@...aro.org>, Mike Leach <mike.leach@...aro.org>,
        Robert Walker <robert.walker@....com>
Subject: [PATCH v2 5/6] perf cs-etm: Treat EO_TRACE element as trace discontinuity

If decoder outputs 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 CS_ETM_DISCONTINUITY packet for EO_TRACE element
hereby flushing the end of trace data in cs-etm.c.

Cc: Mathieu Poirier <mathieu.poirier@...aro.org>
Cc: Mike Leach <mike.leach@...aro.org>
Cc: Robert Walker <robert.walker@....com>
Signed-off-by: Leo Yan <leo.yan@...aro.org>
---
 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 46b67f1..bcb5c98 100644
--- a/tools/perf/util/cs-etm-decoder/cs-etm-decoder.c
+++ b/tools/perf/util/cs-etm-decoder/cs-etm-decoder.c
@@ -411,6 +411,7 @@ static ocsd_datapath_resp_t cs_etm_decoder__gen_trace_elem_printer(
 	case OCSD_GEN_TRC_ELEM_UNKNOWN:
 		break;
 	case OCSD_GEN_TRC_ELEM_NO_SYNC:
+	case OCSD_GEN_TRC_ELEM_EO_TRACE:
 		resp = cs_etm_decoder__buffer_discontinuity(decoder,
 							    trace_chan_id);
 		decoder->trace_on = false;
@@ -431,7 +432,6 @@ 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:
-- 
2.7.4