perf cs-etm: Rename CS_ETM_TRACE_ON to CS_ETM_DISCONTINUITY

TRACE_ON element is used at the beginning of trace, it also can be
appeared in the middle of trace data to indicate discontinuity; for
example, it's possible to see multiple TRACE_ON elements in the trace
stream if the trace is being limited by address range filtering.

Furthermore, except TRACE_ON element is for discontinuity, NO_SYNC and
EO_TRACE also can be used to indicate discontinuity, though they are
used for different scenarios for which the trace is interrupted.

This patch renames sample type CS_ETM_TRACE_ON to CS_ETM_DISCONTINUITY,
firstly the new name describes more closely the purpose of the packet;
secondly this is a preparation for other output elements which also
cause the trace discontinuity thus they can share the same one packet
type.
Signed-off-by: Leo Yan <leo.yan@linaro.org>
Reviewed-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Mike Leach <mike.leach@linaro.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Robert Walker <robert.walker@arm.com>
Cc: coresight@lists.linaro.org
Cc: linux-arm-kernel@lists.infradead.org
Link: http://lkml.kernel.org/r/1544513908-16805-6-git-send-email-leo.yan@linaro.orgSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/util/cs-etm-decoder/cs-etm-decoder.c

@@ -390,11 +390,11 @@ cs_etm_decoder__buffer_range(struct cs_etm_decoder *decoder,
 }
 
 static ocsd_datapath_resp_t
-cs_etm_decoder__buffer_trace_on(struct cs_etm_decoder *decoder,
+cs_etm_decoder__buffer_discontinuity(struct cs_etm_decoder *decoder,
 					   const uint8_t trace_chan_id)
 {
 	return cs_etm_decoder__buffer_packet(decoder, trace_chan_id,
-					     CS_ETM_TRACE_ON);
+					     CS_ETM_DISCONTINUITY);
 }
 
 static ocsd_datapath_resp_t cs_etm_decoder__gen_trace_elem_printer(
@@ -412,7 +412,7 @@ static ocsd_datapath_resp_t cs_etm_decoder__gen_trace_elem_printer(
 	case OCSD_GEN_TRC_ELEM_NO_SYNC:
 		break;
 	case OCSD_GEN_TRC_ELEM_TRACE_ON:
-		resp = cs_etm_decoder__buffer_trace_on(decoder,
+		resp = cs_etm_decoder__buffer_discontinuity(decoder,
 							    trace_chan_id);
 		break;
 	case OCSD_GEN_TRC_ELEM_INSTR_RANGE:

tools/perf/util/cs-etm-decoder/cs-etm-decoder.h

@@ -25,7 +25,7 @@ struct cs_etm_buffer {
 enum cs_etm_sample_type {
 	CS_ETM_EMPTY,
 	CS_ETM_RANGE,
-	CS_ETM_TRACE_ON,
+	CS_ETM_DISCONTINUITY,
 };
 
 enum cs_etm_isa {

tools/perf/util/cs-etm.c

@@ -562,8 +562,8 @@ static inline int cs_etm__t32_instr_size(struct cs_etm_queue *etmq,
 
 static inline u64 cs_etm__first_executed_instr(struct cs_etm_packet *packet)
 {
-	/* Returns 0 for the CS_ETM_TRACE_ON packet */
-	if (packet->sample_type == CS_ETM_TRACE_ON)
+	/* Returns 0 for the CS_ETM_DISCONTINUITY packet */
+	if (packet->sample_type == CS_ETM_DISCONTINUITY)
 		return 0;
 
 	return packet->start_addr;
@@ -572,8 +572,8 @@ static inline u64 cs_etm__first_executed_instr(struct cs_etm_packet *packet)
 static inline
 u64 cs_etm__last_executed_instr(const struct cs_etm_packet *packet)
 {
-	/* Returns 0 for the CS_ETM_TRACE_ON packet */
-	if (packet->sample_type == CS_ETM_TRACE_ON)
+	/* Returns 0 for the CS_ETM_DISCONTINUITY packet */
+	if (packet->sample_type == CS_ETM_DISCONTINUITY)
 		return 0;
 
 	return packet->end_addr - packet->last_instr_size;
@@ -972,7 +972,7 @@ static int cs_etm__sample(struct cs_etm_queue *etmq)
 		bool generate_sample = false;
 
 		/* Generate sample for tracing on packet */
-		if (etmq->prev_packet->sample_type == CS_ETM_TRACE_ON)
+		if (etmq->prev_packet->sample_type == CS_ETM_DISCONTINUITY)
 			generate_sample = true;
 
 		/* Generate sample for branch taken packet */
@@ -1148,7 +1148,7 @@ static int cs_etm__run_decoder(struct cs_etm_queue *etmq)
 					 */
 					cs_etm__sample(etmq);
 					break;
-				case CS_ETM_TRACE_ON:
+				case CS_ETM_DISCONTINUITY:
 					/*
 					 * Discontinuity in trace, flush
 					 * previous branch stack