perf cs-etm: Add notion of time to decoding code

This patch deals with timestamp packets received from the decoding
library in order to give the front end packet processing loop a handle
on the time instruction conveyed by range packets have been executed at.

Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Tested-by: Leo Yan <leo.yan@linaro.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Suzuki Poulouse <suzuki.poulose@arm.com>
Cc: coresight@lists.linaro.org
Cc: linux-arm-kernel@lists.infradead.org
Link: http://lkml.kernel.org/r/20190524173508.29044-17-mathieu.poirier@linaro.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 19 insertions, 0 deletions

diff --git a/tools/perf/util/cs-etm.c b/tools/perf/util/cs-etm.c
index 17adf554b679..91496a3a2209 100644
--- a/tools/perf/util/cs-etm.c
+++ b/tools/perf/util/cs-etm.c
@@ -80,6 +80,7 @@ struct cs_etm_queue {
 	struct cs_etm_decoder *decoder;
 	struct auxtrace_buffer *buffer;
 	unsigned int queue_nr;
+	u8 pending_timestamp;
 	u64 offset;
 	const unsigned char *buf;
 	size_t buf_len, buf_used;
@@ -133,6 +134,19 @@ int cs_etm__get_cpu(u8 trace_chan_id, int *cpu)
 	return 0;
 }
 
+void cs_etm__etmq_set_traceid_queue_timestamp(struct cs_etm_queue *etmq,
+					      u8 trace_chan_id)
+{
+	/*
+	 * Wnen a timestamp packet is encountered the backend code
+	 * is stopped so that the front end has time to process packets
+	 * that were accumulated in the traceID queue.  Since there can
+	 * be more than one channel per cs_etm_queue, we need to specify
+	 * what traceID queue needs servicing.
+	 */
+	etmq->pending_timestamp = trace_chan_id;
+}
+
 static void cs_etm__clear_packet_queue(struct cs_etm_packet_queue *queue)
 {
 	int i;
@@ -942,6 +956,11 @@ int cs_etm__etmq_set_tid(struct cs_etm_queue *etmq,
 	return 0;
 }
 
+bool cs_etm__etmq_is_timeless(struct cs_etm_queue *etmq)
+{
+	return !!etmq->etm->timeless_decoding;
+}
+
 static int cs_etm__synth_instruction_sample(struct cs_etm_queue *etmq,
 					    struct cs_etm_traceid_queue *tidq,
 					    u64 addr, u64 period)