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Etnaviv assumes that GPU page size is 4KiB, however, GPUVA ranges collision when using softpin capable GPUs on a non 4KiB CPU page size configuration. The root cause is that kernel side BO takes up bigger address space than userspace expect, the size of backing memory of GEM buffer objects are required to align to the CPU PAGE_SIZE. Therefore, results in userspace allocated GPUVA range fails to be inserted to the specified hole exactly. To solve this problem, record the GPU visiable size of a BO firstly, then map and unmap the SG entry strictly with respect to the total GPUVA size. Signed-off-by: Sui Jingfeng <sui.jingfeng@linux.dev> Signed-off-by: Lucas Stach <l.stach@pengutronix.de> |
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| README | ||
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.