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[Why] This was added in the past to solve the issue of not knowing when to stall for medium and full updates in DM. Since DC is ultimately decides what requires bandwidth changes we wanted to make use of it directly to determine this. The problem is that we can't actually pass any of the stream or surface updates into DC global validation, so we don't actually check if the new configuration is valid - we just validate the old existing config instead and stall for outstanding commits to finish. There's also the problem of grabbing the DRM private object for pageflips which can lead to page faults in the case where commits execute out of order and free a DRM private object state that was still required for commit tail. [How] Now that we reset the plane in DM with the same conditions DC checks we can have planes go through DC validation and we know when we need to check and stall based on whether the stream or planes changed. We mark lock_and_validation_needed whenever we've done this, so just go back to using that instead of dm_determine_update_type_for_commit. Since we'll skip resetting the plane for a pageflip we will no longer grab the DRM private object for pageflips as well, avoiding the page fault issued caused by pageflipping under load with commits executing out of order. Signed-off-by: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com> Reviewed-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.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 Restructured Text 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.