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ec9903d6cc
Some replicators have hard coded filtering of "trace" data, based on the
source device. This is different from the trace filtering based on
TraceID, available in the standard programmable replicators. e.g.,
Qualcomm replicators have filtering based on custom trace protocol
format and is not programmable.
The source device could be connected to the replicator via intermediate
components (e.g., a funnel). Thus we need platform information from
the firmware tables to decide the source device corresponding to a
given output port from the replicator. Given this affects "trace
path building" and traversing the path back from the sink to source,
add the concept of "filtering by source" to the generic coresight
connection.
The specified source will be marked like below in the Devicetree.
test-replicator {
... ... ... ...
out-ports {
... ... ... ...
port@0 {
reg = <0>;
xyz: endpoint {
remote-endpoint = <&zyx>;
filter-source = <&source_1>; <-- To specify the source to
}; be filtered out here.
};
port@1 {
reg = <1>;
abc: endpoint {
remote-endpoint = <&cba>;
filter-source = <&source_2>; <-- To specify the source to
}; be filtered out here.
};
};
};
Signed-off-by: Tao Zhang <quic_taozha@quicinc.com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Link: https://lore.kernel.org/r/20241213100731.25914-4-quic_taozha@quicinc.com
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Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.