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On devices with DMM, all allocations are done through either DMM or TILER. DMM/TILER being a limited resource means that such allocations will start to fail before actual free memory is exhausted. What is even worse is that with time DMM/TILER space gets fragmented to the point that even if we have enough free DMM/TILER space and free memory, allocation fails because there is no big enough free block in DMM/TILER space. Such failures can be easily observed with OMAP xorg DDX, for example - starting few GUI applications (so buffers for their windows are allocated) and then rotating landscape<->portrait while closing and opening new windows soon results in allocation failures. Fix that by mapping buffers through DMM/TILER only when really needed, like, for scanout buffers. Signed-off-by: Ivaylo Dimitrov <ivo.g.dimitrov.75@gmail.com> Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com> Link: https://patchwork.freedesktop.org/patch/msgid/1642587791-13222-4-git-send-email-ivo.g.dimitrov.75@gmail.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.