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The current code can issue CDMA flushes (DMAPUT bumps) in the middle of a job, before all opcodes have been written into the pushbuffer. This can happen when pushbuffer fills up. Presumably this made sense at some point in the past, but it doesn't anymore, as it cannot lead to more space appearing in the pushbuffer as it is only cleaned full jobs at a time. Mid-job flushes can also cause problems, as in an extreme situation (seen in practice), the hardware can run through the entire pushbuffer including the prefix of a partially written job without the driver being able to process any CDMA updates. This can cause the engine MLOCK to be taken and held for extended periods as the tail of the job is not yet available to hardware. Signed-off-by: Mikko Perttunen <mperttunen@nvidia.com> Signed-off-by: Thierry Reding <treding@nvidia.com> Link: https://lore.kernel.org/r/20250204024546.1168126-1-mperttunen@nvidia.com
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.