return metadata;
}
+/**
+ * Puts a fragment of an auxtrace buffer into the auxtrace queues based
+ * on the bounds of aux_event, if it matches with the buffer that's at
+ * file_offset.
+ *
+ * Normally, whole auxtrace buffers would be added to the queue. But we
+ * want to reset the decoder for every PERF_RECORD_AUX event, and the decoder
+ * is reset across each buffer, so splitting the buffers up in advance has
+ * the same effect.
+ */
+static int cs_etm__queue_aux_fragment(struct perf_session *session, off_t file_offset, size_t sz,
+ struct perf_record_aux *aux_event, struct perf_sample *sample)
+{
+ int err;
+ char buf[PERF_SAMPLE_MAX_SIZE];
+ union perf_event *auxtrace_event_union;
+ struct perf_record_auxtrace *auxtrace_event;
+ union perf_event auxtrace_fragment;
+ __u64 aux_offset, aux_size;
+
+ struct cs_etm_auxtrace *etm = container_of(session->auxtrace,
+ struct cs_etm_auxtrace,
+ auxtrace);
+
+ /*
+ * There should be a PERF_RECORD_AUXTRACE event at the file_offset that we got
+ * from looping through the auxtrace index.
+ */
+ err = perf_session__peek_event(session, file_offset, buf,
+ PERF_SAMPLE_MAX_SIZE, &auxtrace_event_union, NULL);
+ if (err)
+ return err;
+ auxtrace_event = &auxtrace_event_union->auxtrace;
+ if (auxtrace_event->header.type != PERF_RECORD_AUXTRACE)
+ return -EINVAL;
+
+ if (auxtrace_event->header.size < sizeof(struct perf_record_auxtrace) ||
+ auxtrace_event->header.size != sz) {
+ return -EINVAL;
+ }
+
+ /*
+ * In per-thread mode, CPU is set to -1, but TID will be set instead. See
+ * auxtrace_mmap_params__set_idx(). Return 'not found' if neither CPU nor TID match.
+ */
+ if ((auxtrace_event->cpu == (__u32) -1 && auxtrace_event->tid != sample->tid) ||
+ auxtrace_event->cpu != sample->cpu)
+ return 1;
+
+ if (aux_event->flags & PERF_AUX_FLAG_OVERWRITE) {
+ /*
+ * Clamp size in snapshot mode. The buffer size is clamped in
+ * __auxtrace_mmap__read() for snapshots, so the aux record size doesn't reflect
+ * the buffer size.
+ */
+ aux_size = min(aux_event->aux_size, auxtrace_event->size);
+
+ /*
+ * In this mode, the head also points to the end of the buffer so aux_offset
+ * needs to have the size subtracted so it points to the beginning as in normal mode
+ */
+ aux_offset = aux_event->aux_offset - aux_size;
+ } else {
+ aux_size = aux_event->aux_size;
+ aux_offset = aux_event->aux_offset;
+ }
+
+ if (aux_offset >= auxtrace_event->offset &&
+ aux_offset + aux_size <= auxtrace_event->offset + auxtrace_event->size) {
+ /*
+ * If this AUX event was inside this buffer somewhere, create a new auxtrace event
+ * based on the sizes of the aux event, and queue that fragment.
+ */
+ auxtrace_fragment.auxtrace = *auxtrace_event;
+ auxtrace_fragment.auxtrace.size = aux_size;
+ auxtrace_fragment.auxtrace.offset = aux_offset;
+ file_offset += aux_offset - auxtrace_event->offset + auxtrace_event->header.size;
+
+ pr_debug3("CS ETM: Queue buffer size: %#"PRI_lx64" offset: %#"PRI_lx64
+ " tid: %d cpu: %d\n", aux_size, aux_offset, sample->tid, sample->cpu);
+ return auxtrace_queues__add_event(&etm->queues, session, &auxtrace_fragment,
+ file_offset, NULL);
+ }
+
+ /* Wasn't inside this buffer, but there were no parse errors. 1 == 'not found' */
+ return 1;
+}
+
+static int cs_etm__queue_aux_records_cb(struct perf_session *session, union perf_event *event,
+ u64 offset __maybe_unused, void *data __maybe_unused)
+{
+ struct perf_sample sample;
+ int ret;
+ struct auxtrace_index_entry *ent;
+ struct auxtrace_index *auxtrace_index;
+ struct evsel *evsel;
+ size_t i;
+
+ /* Don't care about any other events, we're only queuing buffers for AUX events */
+ if (event->header.type != PERF_RECORD_AUX)
+ return 0;
+
+ if (event->header.size < sizeof(struct perf_record_aux))
+ return -EINVAL;
+
+ /* Truncated Aux records can have 0 size and shouldn't result in anything being queued. */
+ if (!event->aux.aux_size)
+ return 0;
+
+ /*
+ * Parse the sample, we need the sample_id_all data that comes after the event so that the
+ * CPU or PID can be matched to an AUXTRACE buffer's CPU or PID.
+ */
+ evsel = evlist__event2evsel(session->evlist, event);
+ if (!evsel)
+ return -EINVAL;
+ ret = evsel__parse_sample(evsel, event, &sample);
+ if (ret)
+ return ret;
+
+ /*
+ * Loop through the auxtrace index to find the buffer that matches up with this aux event.
+ */
+ list_for_each_entry(auxtrace_index, &session->auxtrace_index, list) {
+ for (i = 0; i < auxtrace_index->nr; i++) {
+ ent = &auxtrace_index->entries[i];
+ ret = cs_etm__queue_aux_fragment(session, ent->file_offset,
+ ent->sz, &event->aux, &sample);
+ /*
+ * Stop search on error or successful values. Continue search on
+ * 1 ('not found')
+ */
+ if (ret != 1)
+ return ret;
+ }
+ }
+
+ /*
+ * Couldn't find the buffer corresponding to this aux record, something went wrong. Warn but
+ * don't exit with an error because it will still be possible to decode other aux records.
+ */
+ pr_err("CS ETM: Couldn't find auxtrace buffer for aux_offset: %#"PRI_lx64
+ " tid: %d cpu: %d\n", event->aux.aux_offset, sample.tid, sample.cpu);
+ return 0;
+}
+
+static int cs_etm__queue_aux_records(struct perf_session *session)
+{
+ struct auxtrace_index *index = list_first_entry_or_null(&session->auxtrace_index,
+ struct auxtrace_index, list);
+ if (index && index->nr > 0)
+ return perf_session__peek_events(session, session->header.data_offset,
+ session->header.data_size,
+ cs_etm__queue_aux_records_cb, NULL);
+
+ /*
+ * We would get here if there are no entries in the index (either no auxtrace
+ * buffers or no index at all). Fail silently as there is the possibility of
+ * queueing them in cs_etm__process_auxtrace_event() if etm->data_queued is still
+ * false.
+ *
+ * In that scenario, buffers will not be split by AUX records.
+ */
+ return 0;
+}
+
int cs_etm__process_auxtrace_info(union perf_event *event,
struct perf_session *session)
{
if (err)
goto err_delete_thread;
- err = auxtrace_queues__process_index(&etm->queues, session);
+ err = cs_etm__queue_aux_records(session);
if (err)
goto err_delete_thread;
projects / users / hch / uuid.git / commitdiff