GitHub-Mirror/linux-bl808
2
0
Fork 0
mirror of https://github.com/Fishwaldo/linux-bl808.git synced 2025-06-17 20:25:19 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions

coresight: Add default sink selection to CoreSight base

Browse source 
Adds a method to select a suitable sink connected to a given source.

In cases where no sink is defined, the coresight_find_default_sink
routine can search from a given source, through the child connections
until a suitable sink is found.

The suitability is defined in by the sink coresight_dev_subtype on the
CoreSight device, and the distance from the source by counting
connections.

Higher value subtype is preferred - where these are equal, shorter
distance from source is used as a tie-break.

This allows for default sink to be discovered were none is specified
(e.g. perf command line)

Signed-off-by: Mike Leach <mike.leach@linaro.org>
Suggested-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Reviewed-by: Leo Yan <leo.yan@linaro.org>
Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Link: https://lore.kernel.org/r/20200716175746.3338735-15-mathieu.poirier@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Mike Leach 2020-07-16 11:57:43 -06:00 • committed by Greg Kroah-Hartman
parent d021f5c5ff
commit 0336bdfd73
3 changed files with 171 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

3
include/linux/coresight.h
View file

@ -48,6 +48,7 @@ enum coresight_dev_subtype_sink {
CORESIGHT_DEV_SUBTYPE_SINK_NONE,
CORESIGHT_DEV_SUBTYPE_SINK_PORT,
CORESIGHT_DEV_SUBTYPE_SINK_BUFFER,
CORESIGHT_DEV_SUBTYPE_SINK_SYSMEM,
};
enum coresight_dev_subtype_link {
@ -182,6 +183,7 @@ struct coresight_sysfs_link {
* happens when a source has been selected and a path is enabled
* from source to that sink.
* @ea: Device attribute for sink representation under PMU directory.
* @def_sink: cached reference to default sink found for this device.
* @ect_dev: Associated cross trigger device. Not part of the trace data
* path or connections.
* @nr_links: number of sysfs links created to other components from this
@ -200,6 +202,7 @@ struct coresight_device {
/* sink specific fields */
bool activated; /* true only if a sink is part of a path */
struct dev_ext_attribute *ea;
struct coresight_device *def_sink;
/* cross trigger handling */
struct coresight_device *ect_dev;
/* sysfs links between components */