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Subject[PATCH 51/85] perf cs-etm: Linking PE contextID with perf thread mechanic
Date
From: Mathieu Poirier <mathieu.poirier@linaro.org>

Link contextID packets received from the decoder with the perf tool
thread mechanic so that we know the specifics of the process currently
executing.

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/20190524173508.29044-16-mathieu.poirier@linaro.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
.../perf/util/cs-etm-decoder/cs-etm-decoder.c | 20 ++++++++++++
tools/perf/util/cs-etm.c | 32 +++++++++++++++----
tools/perf/util/cs-etm.h | 10 ++++++
3 files changed, 56 insertions(+), 6 deletions(-)

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 87264b79de0e..ce85e52f989c 100644
--- a/tools/perf/util/cs-etm-decoder/cs-etm-decoder.c
+++ b/tools/perf/util/cs-etm-decoder/cs-etm-decoder.c
@@ -402,6 +402,24 @@ cs_etm_decoder__buffer_exception_ret(struct cs_etm_packet_queue *queue,
CS_ETM_EXCEPTION_RET);
}

+static ocsd_datapath_resp_t
+cs_etm_decoder__set_tid(struct cs_etm_queue *etmq,
+ const ocsd_generic_trace_elem *elem,
+ const uint8_t trace_chan_id)
+{
+ pid_t tid;
+
+ /* Ignore PE_CONTEXT packets that don't have a valid contextID */
+ if (!elem->context.ctxt_id_valid)
+ return OCSD_RESP_CONT;
+
+ tid = elem->context.context_id;
+ if (cs_etm__etmq_set_tid(etmq, tid, trace_chan_id))
+ return OCSD_RESP_FATAL_SYS_ERR;
+
+ return OCSD_RESP_CONT;
+}
+
static ocsd_datapath_resp_t cs_etm_decoder__gen_trace_elem_printer(
const void *context,
const ocsd_trc_index_t indx __maybe_unused,
@@ -440,6 +458,8 @@ static ocsd_datapath_resp_t cs_etm_decoder__gen_trace_elem_printer(
trace_chan_id);
break;
case OCSD_GEN_TRC_ELEM_PE_CONTEXT:
+ resp = cs_etm_decoder__set_tid(etmq, elem, trace_chan_id);
+ break;
case OCSD_GEN_TRC_ELEM_ADDR_NACC:
case OCSD_GEN_TRC_ELEM_TIMESTAMP:
case OCSD_GEN_TRC_ELEM_CYCLE_COUNT:
diff --git a/tools/perf/util/cs-etm.c b/tools/perf/util/cs-etm.c
index afc2491f9f2a..17adf554b679 100644
--- a/tools/perf/util/cs-etm.c
+++ b/tools/perf/util/cs-etm.c
@@ -907,13 +907,8 @@ cs_etm__get_trace(struct cs_etm_queue *etmq)
}

static void cs_etm__set_pid_tid_cpu(struct cs_etm_auxtrace *etm,
- struct auxtrace_queue *queue,
struct cs_etm_traceid_queue *tidq)
{
- /* CPU-wide tracing isn't supported yet */
- if (queue->tid == -1)
- return;
-
if ((!tidq->thread) && (tidq->tid != -1))
tidq->thread = machine__find_thread(etm->machine, -1,
tidq->tid);
@@ -922,6 +917,31 @@ static void cs_etm__set_pid_tid_cpu(struct cs_etm_auxtrace *etm,
tidq->pid = tidq->thread->pid_;
}

+int cs_etm__etmq_set_tid(struct cs_etm_queue *etmq,
+ pid_t tid, u8 trace_chan_id)
+{
+ int cpu, err = -EINVAL;
+ struct cs_etm_auxtrace *etm = etmq->etm;
+ struct cs_etm_traceid_queue *tidq;
+
+ tidq = cs_etm__etmq_get_traceid_queue(etmq, trace_chan_id);
+ if (!tidq)
+ return err;
+
+ if (cs_etm__get_cpu(trace_chan_id, &cpu) < 0)
+ return err;
+
+ err = machine__set_current_tid(etm->machine, cpu, tid, tid);
+ if (err)
+ return err;
+
+ tidq->tid = tid;
+ thread__zput(tidq->thread);
+
+ cs_etm__set_pid_tid_cpu(etm, tidq);
+ return 0;
+}
+
static int cs_etm__synth_instruction_sample(struct cs_etm_queue *etmq,
struct cs_etm_traceid_queue *tidq,
u64 addr, u64 period)
@@ -1866,7 +1886,7 @@ static int cs_etm__process_timeless_queues(struct cs_etm_auxtrace *etm,
continue;

if ((tid == -1) || (tidq->tid == tid)) {
- cs_etm__set_pid_tid_cpu(etm, queue, tidq);
+ cs_etm__set_pid_tid_cpu(etm, tidq);
cs_etm__run_decoder(etmq);
}
}
diff --git a/tools/perf/util/cs-etm.h b/tools/perf/util/cs-etm.h
index f16082d37ab5..b2a7628620bf 100644
--- a/tools/perf/util/cs-etm.h
+++ b/tools/perf/util/cs-etm.h
@@ -181,6 +181,8 @@ struct cs_etm_packet_queue {
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);
+int cs_etm__etmq_set_tid(struct cs_etm_queue *etmq,
+ pid_t tid, u8 trace_chan_id);
struct cs_etm_packet_queue
*cs_etm__etmq_get_packet_queue(struct cs_etm_queue *etmq, u8 trace_chan_id);
#else
@@ -197,6 +199,14 @@ static inline int cs_etm__get_cpu(u8 trace_chan_id __maybe_unused,
return -1;
}

+static inline int cs_etm__etmq_set_tid(
+ struct cs_etm_queue *etmq __maybe_unused,
+ pid_t tid __maybe_unused,
+ u8 trace_chan_id __maybe_unused)
+{
+ return -1;
+}
+
static inline struct cs_etm_packet_queue *cs_etm__etmq_get_packet_queue(
struct cs_etm_queue *etmq __maybe_unused,
u8 trace_chan_id __maybe_unused)
--
2.20.1
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