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75f4e3619f
The TMC-ETR can use the target trace buffer in two different modes. Normal physically contiguous mode and a discontiguous list pages in Scatter-Gather mode. Also we have dedicated Coresight component, CATU (Coresight Address Translation Unit) to provide improved scatter-gather mode in Coresight SoC-600. This complicates the management of the buffer used for trace, depending on the mode in which ETR is configured. So, this patch adds a transparent layer for managing the ETR buffer which abstracts the basic operations on the buffer (alloc, free, sync and retrieve the data) and uses the mode specific helpers to do the actual operation. This also allows the ETR driver to choose the best mode for a given use case and adds the flexibility to fallback to a different mode, without duplicating the code. The patch also adds the "normal" flat memory mode and switches the sysfs driver to use the new layer. Cc: Mathieu Poirier <mathieu.poirier@linaro.org> Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com> Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.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 Restructured Text markup notation.
See Documentation/00-INDEX for a list of what is contained in each file.
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.