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authorMathieu Poirier <mathieu.poirier@linaro.org>2019-05-24 20:35:00 +0300
committerArnaldo Carvalho de Melo <acme@redhat.com>2019-06-10 21:50:02 +0300
commitc7bfa2fd0da966bf83061102fbe1e7b974e81764 (patch)
tree0514b048482f0e240baec5e4685a7ad62f61c5bb /tools/perf/util/cs-etm.h
parent882f4874ad74c528c3437c9c8783310b073323a1 (diff)
downloadlinux-c7bfa2fd0da966bf83061102fbe1e7b974e81764.tar.xz
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: 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/20190524173508.29044-10-mathieu.poirier@linaro.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/util/cs-etm.h')
-rw-r--r--tools/perf/util/cs-etm.h15
1 files changed, 13 insertions, 2 deletions
diff --git a/tools/perf/util/cs-etm.h b/tools/perf/util/cs-etm.h
index 75385e2fd283..f16082d37ab5 100644
--- a/tools/perf/util/cs-etm.h
+++ b/tools/perf/util/cs-etm.h
@@ -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;
}