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The DUAL_QUEUE_WA tells the GuC to not allow concurrent submissions on RCS and CCSes with different address spaces, which on DG2 is required as a WA for an HW bug. On newer platforms, this block has been moved in HW at the CS level, by stalling the RCS/CCS context switch when one of the other RCS/CCSes is busy with a different address space. While functionally correct, having a submission stalled on the HW limits the GuC ability to shuffle things around and can cause complications if the non-stalled submission runs for a long time, because the GuC doesn't know that the stalled submission isn't actually running and might declare it as hung. Therefore, we enable the DUAL_QUEUE_WA on all newer platforms to move management back to the GuC. Note that the GuC specs also recommend enabling this for all platforms starting from MTL that have a CCS. v2: only apply the WA on GTs that have CCS engines v3: split comment (Jonathan) Signed-off-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com> Cc: John Harrison <John.C.Harrison@Intel.com> Cc: Jesus Narvaez <jesus.narvaez@intel.com> Cc: Jonathan Cavitt <jonathan.cavitt@intel.com> Reviewed-by: Jonathan Cavitt <jonathan.cavitt@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20241213181012.2178794-1-daniele.ceraolospurio@intel.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.