hwtracing/coresight/coresight-core.c

35  * struct coresight_node - elements of a path, from source to sink
353 		 * ETF devices are tricky... They can be a link or a sink,
355 		 * selected as a sink it will be configured as a sink, otherwise
431 		 * ETF devices are tricky... They can be a link or a sink,
433 		 * selected as a sink it will be configured as a sink, otherwise
446 			 * failed to enable the sink, there are no components
514  * coresight_get_sink_by_id - returns the sink that matches the id
515  * @id: Id of the sink to match
517  * The name of a sink is unique, whether it is found on the AMBA bus or
519  * a sink.
618  * _coresight_build_path - recursively build a path from a @csdev to a sink.
620  * @sink:	The final sink we want in this path.
623  * The tree of Coresight device is traversed until @sink is found.
624  * From there the sink is added to the list along with all the devices that led
625  * to that point - the end result is a list from source to sink. In that list
626  * the source is the first device and the sink the last one.
629 				 struct coresight_device *sink,
636 	/* The sink has been found.  Enqueue the element */
637 	if (csdev == sink)
640 	if (coresight_is_percpu_source(csdev) && coresight_is_percpu_sink(sink) &&
641 	    sink == per_cpu(csdev_sink, source_ops(csdev)->cpu_id(csdev))) {
642 		if (_coresight_build_path(sink, sink, path) == 0) {
648 	/* Not a sink - recursively explore each port found on this element */
654 		    _coresight_build_path(child_dev, sink, path) == 0) {
665 	 * A path from this element to a sink has been found.  The elements
666 	 * leading to the sink are already enqueued, all that is left to do
685 				       struct coresight_device *sink)
690 	if (!sink)
699 	rc = _coresight_build_path(source, sink, path);
731 /* return true if the device is a suitable type for a default sink */
734 	/* sink & correct subtype */
743  * coresight_select_best_sink - return the best sink for use as default from
746  * @sink:	current best sink.
747  * @depth:      search depth where current sink was found.
748  * @new_sink:	new sink for comparison with current sink.
749  * @new_depth:  search depth where new sink was found.
754  * Where two sinks of equal priority are found, the sink closest to the
757  * return @new_sink & update @depth if better than @sink, else return @sink.
760 coresight_select_best_sink(struct coresight_device *sink, int *depth,
765 	if (!sink) {
769 		   sink->subtype.sink_subtype) {
770 		/* found better sink */
773 		    sink->subtype.sink_subtype) &&
775 		/* found same but closer sink */
781 	return update ? new_sink : sink;
786  * source to find a suitable default sink.
789  * @depth: [in] search depth of calling dev, [out] depth of found sink.
792  * sink is encountered and return that sink to the original caller.
794  * If current device is a plain sink return that & depth, otherwise recursively
795  * call child connections looking for a sink. Select best possible using
798  * return best sink found, or NULL if not found at this node or child nodes.
815 	 * Not a sink we want - or possible child sink may be better.
819 		struct coresight_device *child_dev, *sink = NULL;
824 			sink = coresight_find_sink(child_dev, &child_depth);
826 		if (sink)
829 								sink,
834 	/* return found sink and depth */
841  * coresight_find_default_sink: Find a sink suitable for use as a
842  * default sink.
844  * @csdev: starting source to find a connected sink.
846  * Walks connections graph looking for a suitable sink to enable for the
848  * to select the best sink.
850  * If a sink is found, then the default sink for this device is set and
854  * sink.
861 	/* look for a default sink if we have not found for this device */
873 	struct coresight_device *sink = data;
876 	if (source->def_sink == sink)
882  * coresight_clear_default_sink: Remove all default sink references to the
883  * supplied sink.
885  * If supplied device is a sink, then check all the bus devices and clear
886  * out all the references to this sink from the coresight_device def_sink
889  * @csdev: coresight sink - remove references to this from all sources.