Commit c7bfa2fd authored by Mathieu Poirier's avatar Mathieu Poirier Committed by Arnaldo Carvalho de Melo
Browse files

perf cs-etm: Introduce the concept of trace ID queues 



In an ideal world there is one CPU per cs_etm_queue and as such, one
trace ID per cs_etm_queue.  In the real world CoreSight topologies allow
multiple CPUs to use the same sink, which translates to multiple trace
IDs per cs_etm_queue.

To deal with this a new cs_etm_traceid_queue structure is introduced to
enclose all the information related to a single trace ID, allowing a
cs_etm_queue to handle traces generated by any number of CPUs.

Signed-off-by: default avatarMathieu Poirier <mathieu.poirier@linaro.org>
Tested-by: default avatarLeo 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/20190524173508.29044-10-mathieu.poirier@linaro.org


Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent 882f4874

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

+2 −2
Original line number Diff line number Diff line
@@ -413,8 +413,8 @@ static ocsd_datapath_resp_t cs_etm_decoder__gen_trace_elem_printer( 
	struct cs_etm_queue *etmq = decoder->data;

	struct cs_etm_packet_queue *packet_queue;



	/* First get the packet queue */

	packet_queue = cs_etm__etmq_get_packet_queue(etmq);

	/* First get the packet queue for this traceID */

	packet_queue = cs_etm__etmq_get_packet_queue(etmq, trace_chan_id);

	if (!packet_queue)

		return OCSD_RESP_FATAL_SYS_ERR;

tools/perf/util/cs-etm.c

+219 −141

File changed.

Preview size limit exceeded, changes collapsed.

tools/perf/util/cs-etm.h

+13 −2
Original line number Diff line number Diff line
@@ -136,6 +136,16 @@ struct cs_etm_packet { 


#define CS_ETM_PACKET_MAX_BUFFER 1024



/*

 * When working with per-thread scenarios the process under trace can

 * be scheduled on any CPU and as such, more than one traceID may be

 * associated with the same process.  Since a traceID of '0' is illegal

 * as per the CoreSight architecture, use that specific value to

 * identify the queue where all packets (with any traceID) are

 * aggregated.

 */

#define CS_ETM_PER_THREAD_TRACEID 0



struct cs_etm_packet_queue {

	u32 packet_count;

	u32 head;
@@ -172,7 +182,7 @@ int cs_etm__process_auxtrace_info(union perf_event *event, 
				  struct perf_session *session);

int cs_etm__get_cpu(u8 trace_chan_id, int *cpu);

struct cs_etm_packet_queue

*cs_etm__etmq_get_packet_queue(struct cs_etm_queue *etmq);

*cs_etm__etmq_get_packet_queue(struct cs_etm_queue *etmq, u8 trace_chan_id);

#else

static inline int

cs_etm__process_auxtrace_info(union perf_event *event __maybe_unused,
@@ -188,7 +198,8 @@ static inline int cs_etm__get_cpu(u8 trace_chan_id __maybe_unused, 
}



static inline struct cs_etm_packet_queue *cs_etm__etmq_get_packet_queue(

				struct cs_etm_queue *etmq __maybe_unused)

				struct cs_etm_queue *etmq __maybe_unused,

				u8 trace_chan_id __maybe_unused)

{

	return NULL;

}

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