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5690011a70
The gfx-9 trap handler is reading LDS allocation size in 256 bytes granularity (from SQ_WAVE_LDS_ALLOC), but it using the assumption that this value is always even (i.e. the LDS allocation is really done in multiple of 512 bytes). This was true so far, but gfx-950 allocates LDS in chunks of 1280 bytes, making this assumption invalid. This can cause the trap handler to try to save / restore past the end of LDS, and past the LDS allocated slot in the save are, overriding data from the following wave. This patch updates the trap handler to support LDS allocated in 1280 bytes blocks: - During restore, copy from main memory directly to LDS in batch of 1280 bytes. - During save, continue to use 512 bytes blocks (we only have 2 VGPRs we can use to hold data), making sure to mask the upper half of the wave when handling when the LDS size is not a multiple of 512 bytes. Signed-off-by: Lancelot SIX <lancelot.six@amd.com> Co-authored-by: Alex Sierra <alex.sierra@amd.com> Reviewed-by: Jay Cornwall <jay.cornwall@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 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.