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| author | Leonard Crestez <leonard.crestez@nxp.com> | 2019-11-19 01:34:01 +0300 |
|---|---|---|
| committer | Georgi Djakov <georgi.djakov@linaro.org> | 2019-12-16 10:49:54 +0300 |
| commit | 1a0013c62b33158dcb67a3c11872a03be50711a3 (patch) | |
| tree | c3095e63c7641e7e50fcf15f2065870c34dda832 /Documentation/driver-api/interconnect.rst | |
| parent | b92c35e1b9c9211635df9e8fb060c69311871865 (diff) | |
| download | linux-1a0013c62b33158dcb67a3c11872a03be50711a3.tar.xz | |
interconnect: Add interconnect_graph file to debugfs
The interconnect graphs can be difficult to understand and the current
"interconnect_summary" file doesn't even display links in any way.
Add a new "interconnect_graph" file to debugfs in the graphviz "dot"
format which describes interconnect providers, nodes and links.
The file is human-readable and can be visualized by piping through
graphviz. Example:
ssh $TARGET cat /sys/kernel/debug/interconnect/interconnect_graph \
| dot -Tsvg > interconnect_graph.svg
Signed-off-by: Leonard Crestez <leonard.crestez@nxp.com>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: Georgi Djakov <georgi.djakov@linaro.org>
Diffstat (limited to 'Documentation/driver-api/interconnect.rst')
| -rw-r--r-- | Documentation/driver-api/interconnect.rst | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/Documentation/driver-api/interconnect.rst b/Documentation/driver-api/interconnect.rst index cdeb5825f314..5ed4f57a6bac 100644 --- a/Documentation/driver-api/interconnect.rst +++ b/Documentation/driver-api/interconnect.rst @@ -91,3 +91,25 @@ Interconnect consumers are the clients which use the interconnect APIs to get paths between endpoints and set their bandwidth/latency/QoS requirements for these interconnect paths. These interfaces are not currently documented. + +Interconnect debugfs interfaces +------------------------------- + +Like several other subsystems interconnect will create some files for debugging +and introspection. Files in debugfs are not considered ABI so application +software shouldn't rely on format details change between kernel versions. + +``/sys/kernel/debug/interconnect/interconnect_summary``: + +Show all interconnect nodes in the system with their aggregated bandwidth +request. Indented under each node show bandwidth requests from each device. + +``/sys/kernel/debug/interconnect/interconnect_graph``: + +Show the interconnect graph in the graphviz dot format. It shows all +interconnect nodes and links in the system and groups together nodes from the +same provider as subgraphs. The format is human-readable and can also be piped +through dot to generate diagrams in many graphical formats:: + + $ cat /sys/kernel/debug/interconnect/interconnect_graph | \ + dot -Tsvg > interconnect_graph.svg |