+void ctf_update_current_packet_index(struct ctf_stream_definition *stream,
+ struct packet_index *prev_index,
+ struct packet_index *cur_index)
+{
+ uint64_t events_discarded_diff;
+ uint64_t packets_lost_diff = 0;
+
+ /* Update packet index time information */
+
+ /* Current packet begin/end */
+ stream->current.real.begin =
+ cur_index->ts_real.timestamp_begin;
+ stream->current.cycles.begin =
+ cur_index->ts_cycles.timestamp_begin;
+ stream->current.real.end =
+ cur_index->ts_real.timestamp_end;
+ stream->current.cycles.end =
+ cur_index->ts_cycles.timestamp_end;
+
+ /* Update packet index discarded event information */
+ events_discarded_diff = cur_index->events_discarded;
+ if (prev_index) {
+ /* Previous packet begin/end */
+ stream->prev.cycles.begin =
+ prev_index->ts_cycles.timestamp_begin;
+ stream->prev.real.begin =
+ prev_index->ts_real.timestamp_begin;
+ stream->prev.cycles.end =
+ prev_index->ts_cycles.timestamp_end;
+ stream->prev.real.end =
+ prev_index->ts_real.timestamp_end;
+
+ events_discarded_diff -= prev_index->events_discarded;
+ /* packet_seq_num stays at 0 if not produced by the tracer */
+ if (cur_index->packet_seq_num) {
+ packets_lost_diff = cur_index->packet_seq_num -
+ prev_index->packet_seq_num - 1;
+ }
+ /*
+ * Deal with 32-bit wrap-around if the tracer provided a
+ * 32-bit field.
+ */
+ if (prev_index->events_discarded_len == 32) {
+ events_discarded_diff = (uint32_t) events_discarded_diff;
+ }
+ } else {
+ /*
+ * First packet: use current packet info as limits for
+ * previous packet.
+ */
+ stream->prev.cycles.begin =
+ stream->prev.cycles.end =
+ stream->current.cycles.begin;
+ stream->prev.real.begin =
+ stream->prev.real.end =
+ stream->current.real.begin;
+ }
+ stream->events_discarded = events_discarded_diff;
+ stream->packets_lost = packets_lost_diff;
+}
+
+/*
+ * Find the timerange where all the streams in the trace are active
+ * simultaneously.
+ *
+ * Return 0 and update begin/end if necessary on success, return 1 for
+ * empty streams and return a negative value on error.
+ */
+static
+int ctf_find_stream_intersection(struct bt_trace_descriptor *td_read,
+ struct packet_index_time *_real,
+ struct packet_index_time *_cycles)
+{
+ int stream_id, ret = 0;
+ struct packet_index_time real = { INT64_MIN, INT64_MAX },
+ cycles = { INT64_MIN, INT64_MAX };
+ struct ctf_trace *tin = container_of(td_read, struct ctf_trace, parent);
+
+ /* At least one of the two return args must be provided. */
+ if (!_real && !_cycles) {
+ ret = -1;
+ goto end;
+ }
+
+ if (tin->streams->len == 0) {
+ ret = 1;
+ goto end;
+ }
+
+ for (stream_id = 0; stream_id < tin->streams->len;
+ stream_id++) {
+ int filenr;
+ struct ctf_stream_declaration *stream_class;
+
+ stream_class = g_ptr_array_index(tin->streams, stream_id);
+ if (!stream_class) {
+ continue;
+ }
+ for (filenr = 0; filenr < stream_class->streams->len; filenr++) {
+ struct ctf_file_stream *file_stream;
+ struct ctf_stream_pos *stream_pos;
+ struct packet_index *index;
+
+ file_stream = g_ptr_array_index(stream_class->streams,
+ filenr);
+ if (!file_stream) {
+ continue;
+ }
+ stream_pos = &file_stream->pos;
+ if (!stream_pos->packet_index ||
+ stream_pos->packet_index->len <= 0) {
+ ret = 1;
+ goto end;
+ }
+ index = &g_array_index(stream_pos->packet_index,
+ struct packet_index, 0);
+ real.timestamp_begin = max(real.timestamp_begin,
+ index->ts_real.timestamp_begin);
+ cycles.timestamp_begin = max(cycles.timestamp_begin,
+ index->ts_cycles.timestamp_begin);
+
+ index = &g_array_index(stream_pos->packet_index,
+ struct packet_index,
+ stream_pos->packet_index->len - 1);
+ real.timestamp_end = min(real.timestamp_end,
+ index->ts_real.timestamp_end);
+ cycles.timestamp_end = min(cycles.timestamp_end,
+ index->ts_cycles.timestamp_end);
+ }
+ }
+end:
+ if (ret == 0) {
+ if (_real) {
+ *_real = real;
+ }
+ if (_cycles) {
+ *_cycles = cycles;
+ }
+ }
+ return ret;
+}
+
+/*
+ * Find the union of all active regions in the trace collection's traces.
+ * Returns "real" timestamps.
+ *
+ * Return 0 on success.
+ * Return 1 if no intersections are found.
+ * Return a negative value on error.
+ */
+int ctf_find_tc_stream_packet_intersection_union(struct bt_context *ctx,
+ int64_t *_ts_begin, int64_t *_ts_end)
+{
+ int ret = 0, i;
+ int64_t ts_begin = INT64_MAX, ts_end = INT64_MIN;
+
+ if (!ctx || !ctx->tc || !ctx->tc->array || !_ts_begin || !_ts_end) {
+ ret = -EINVAL;
+ goto end;
+ }
+
+ for (i = 0; i < ctx->tc->array->len; i++) {
+ struct bt_trace_descriptor *td_read;
+ struct packet_index_time intersection_real;
+
+ td_read = g_ptr_array_index(ctx->tc->array, i);
+ if (!td_read) {
+ continue;
+ }
+ ret = ctf_find_stream_intersection(td_read, &intersection_real,
+ NULL);
+ if (ret == 1) {
+ /* Empty trace or no stream intersection. */
+ continue;
+ } else if (ret < 0) {
+ goto end;
+ }
+
+ ts_begin = min(intersection_real.timestamp_begin, ts_begin);
+ ts_end = max(intersection_real.timestamp_end, ts_end);
+ }
+
+ if (ts_end < ts_begin) {
+ ret = 1;
+ goto end;
+ }
+ *_ts_begin = ts_begin;
+ *_ts_end = ts_end;
+end:
+ return ret;
+}
+
+int ctf_tc_set_stream_intersection_mode(struct bt_context *ctx)
+{
+ int ret = 0, i;
+
+ if (!ctx || !ctx->tc || !ctx->tc->array) {
+ ret = -EINVAL;
+ goto end;
+ }
+
+ for (i = 0; i < ctx->tc->array->len; i++) {
+ struct bt_trace_descriptor *td_read;
+ struct packet_index_time intersection_real;
+
+ td_read = g_ptr_array_index(ctx->tc->array, i);
+ if (!td_read) {
+ continue;
+ }
+
+ ret = ctf_find_stream_intersection(td_read, &intersection_real,
+ NULL);
+ if (ret == 1) {
+ /* Empty trace or no stream intersection. */
+ continue;
+ } else if (ret < 0) {
+ goto end;
+ }
+
+ td_read->interval_real = intersection_real;
+ td_read->interval_set = true;
+ }
+end:
+ return ret;
+}
+