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SPE_FEAT_FDS adds the ability to filter on the data source of packets. Like the other existing filters, enable filtering with PMSFCR_EL1.FDS when any of the filter bits are set. Each bit position of the 64 bit filter maps to numerical data sources 0-63 described by bits[0:5] in the data source packet (although the full range of data source is 16 bits so higher value data sources can't be filtered on). The filter is an OR of all the filter bits, so for example clearing filter bits 0 and 3 only includes packets from data sources 0 OR 3. Invert the filter given by userspace so that the default value of 0 is equivalent to including all values (no filtering). This allows us to skip adding a new format bit to enable filtering and still support excluding all data sources which would have been a filter value of 0 if not for the inversion. Tested-by: Leo Yan <leo.yan@arm.com> Reviewed-by: Leo Yan <leo.yan@arm.com> Signed-off-by: James Clark <james.clark@linaro.org> Signed-off-by: Will Deacon <will@kernel.org> |
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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.