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[68.147.8.254]) by smtp.gmail.com with ESMTPSA id w142sm231480ita.25.2018.01.15.10.13.33 (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Mon, 15 Jan 2018 10:13:34 -0800 (PST) From: Mathieu Poirier To: acme@kernel.org Cc: peterz@infradead.org, mingo@redhat.com, alexander.shishkin@linux.intel.com, namhyung@kernel.org, adrian.hunter@intel.com, mike.leach@arm.com, suzuki.poulosi@arm.com, jolsa@redhat.com, kim.phillips@arm.com, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org Subject: [PATCH v2 08/10] perf tools: Add full support for CoreSight trace decoding Date: Mon, 15 Jan 2018 11:13:12 -0700 Message-Id: <1516039994-314-9-git-send-email-mathieu.poirier@linaro.org> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1516039994-314-1-git-send-email-mathieu.poirier@linaro.org> References: <1516039994-314-1-git-send-email-mathieu.poirier@linaro.org> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This patch adds support for complete packet decoding, allowing traces collected during a trace session to be decoder from the "report" infrastructure. Co-authored-by: Tor Jeremiassen Signed-off-by: Mathieu Poirier --- tools/perf/util/cs-etm.c | 166 +++++++++++++++++++++++++++++++++++++++++++++-- 1 file changed, 160 insertions(+), 6 deletions(-) -- 2.7.4 diff --git a/tools/perf/util/cs-etm.c b/tools/perf/util/cs-etm.c index 83eb676274b5..407095af1456 100644 --- a/tools/perf/util/cs-etm.c +++ b/tools/perf/util/cs-etm.c @@ -70,6 +70,10 @@ struct cs_etm_queue { u64 offset; }; +static int cs_etm__update_queues(struct cs_etm_auxtrace *etm); +static int cs_etm__process_timeless_queues(struct cs_etm_auxtrace *etm, + pid_t tid, u64 time_); + static void cs_etm__packet_dump(const char *pkt_string) { const char *color = PERF_COLOR_BLUE; @@ -145,9 +149,25 @@ static void cs_etm__dump_event(struct cs_etm_auxtrace *etm, static int cs_etm__flush_events(struct perf_session *session, struct perf_tool *tool) { - (void) session; - (void) tool; - return 0; + int ret; + struct cs_etm_auxtrace *etm = container_of(session->auxtrace, + struct cs_etm_auxtrace, + auxtrace); + if (dump_trace) + return 0; + + if (!tool->ordered_events) + return -EINVAL; + + if (!etm->timeless_decoding) + return -EINVAL; + + ret = cs_etm__update_queues(etm); + + if (ret < 0) + return ret; + + return cs_etm__process_timeless_queues(etm, -1, MAX_TIMESTAMP - 1); } static void cs_etm__free_queue(void *priv) @@ -369,6 +389,138 @@ static int cs_etm__update_queues(struct cs_etm_auxtrace *etm) return 0; } +static int +cs_etm__get_trace(struct cs_etm_buffer *buff, struct cs_etm_queue *etmq) +{ + struct auxtrace_buffer *aux_buffer = etmq->buffer; + struct auxtrace_buffer *old_buffer = aux_buffer; + struct auxtrace_queue *queue; + + queue = &etmq->etm->queues.queue_array[etmq->queue_nr]; + + aux_buffer = auxtrace_buffer__next(queue, aux_buffer); + + /* If no more data, drop the previous auxtrace_buffer and return */ + if (!aux_buffer) { + if (old_buffer) + auxtrace_buffer__drop_data(old_buffer); + buff->len = 0; + return 0; + } + + etmq->buffer = aux_buffer; + + /* If the aux_buffer doesn't have data associated, try to load it */ + if (!aux_buffer->data) { + /* get the file desc associated with the perf data file */ + int fd = perf_data__fd(etmq->etm->session->data); + + aux_buffer->data = auxtrace_buffer__get_data(aux_buffer, fd); + if (!aux_buffer->data) + return -ENOMEM; + } + + /* If valid, drop the previous buffer */ + if (old_buffer) + auxtrace_buffer__drop_data(old_buffer); + + buff->offset = aux_buffer->offset; + buff->len = aux_buffer->size; + buff->buf = aux_buffer->data; + + buff->ref_timestamp = aux_buffer->reference; + + return buff->len; +} + +static void cs_etm__set_pid_tid_cpu(struct cs_etm_auxtrace *etm, + struct auxtrace_queue *queue) +{ + struct cs_etm_queue *etmq = queue->priv; + + /* CPU-wide tracing isn't supported yet */ + if (queue->tid == -1) + return; + + if ((!etmq->thread) && (etmq->tid != -1)) + etmq->thread = machine__find_thread(etm->machine, -1, + etmq->tid); + + if (etmq->thread) { + etmq->pid = etmq->thread->pid_; + if (queue->cpu == -1) + etmq->cpu = etmq->thread->cpu; + } +} + +static int cs_etm__run_decoder(struct cs_etm_queue *etmq) +{ + struct cs_etm_auxtrace *etm = etmq->etm; + struct cs_etm_buffer buffer; + size_t buffer_used, processed; + int err = 0; + + if (!etm->kernel_start) + etm->kernel_start = machine__kernel_start(etm->machine); + + /* Go through each buffer in the queue and decode them one by one */ +more: + buffer_used = 0; + memset(&buffer, 0, sizeof(buffer)); + err = cs_etm__get_trace(&buffer, etmq); + if (err <= 0) + return err; + /* + * We cannot assume consecutive blocks in the data file are contiguous, + * reset the decoder to force re-sync. + */ + err = cs_etm_decoder__reset(etmq->decoder); + if (err != 0) + return err; + + /* Run trace decoder until buffer consumed or end of trace */ + do { + processed = 0; + + err = cs_etm_decoder__process_data_block( + etmq->decoder, + etmq->offset, + &buffer.buf[buffer_used], + buffer.len - buffer_used, + &processed); + + if (err) + return err; + + etmq->offset += processed; + buffer_used += processed; + } while (buffer.len > buffer_used); + +goto more; + + return err; +} + +static int cs_etm__process_timeless_queues(struct cs_etm_auxtrace *etm, + pid_t tid, u64 time_) +{ + unsigned int i; + struct auxtrace_queues *queues = &etm->queues; + + for (i = 0; i < queues->nr_queues; i++) { + struct auxtrace_queue *queue = &etm->queues.queue_array[i]; + struct cs_etm_queue *etmq = queue->priv; + + if (etmq && ((tid == -1) || (etmq->tid == tid))) { + etmq->time = time_; + cs_etm__set_pid_tid_cpu(etm, queue); + cs_etm__run_decoder(etmq); + } + } + + return 0; +} + static int cs_etm__process_event(struct perf_session *session, union perf_event *event, struct perf_sample *sample, @@ -380,9 +532,6 @@ static int cs_etm__process_event(struct perf_session *session, struct cs_etm_auxtrace, auxtrace); - /* Keep compiler happy */ - (void)event; - if (dump_trace) return 0; @@ -405,6 +554,11 @@ static int cs_etm__process_event(struct perf_session *session, return err; } + if (event->header.type == PERF_RECORD_EXIT) + return cs_etm__process_timeless_queues(etm, + event->fork.tid, + sample->time); + return 0; }