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On MTL, objects allocated through i915_gem_object_create_internal() are mapped as uncached in GPU by default because HAS_LLC is false. However in the live_hwsp_read selftest these watcher objects are mapped as WB on CPU side. The conseqence is that the updates done by the GPU are not immediately visible to CPU, thus the selftest is randomly failing due to the stale data in CPU cache. Solution can be either setting WC for CPU + UC for GPU, or WB for CPU + 1-way coherent WB for GPU. To keep the consistency, let's simply inherit the same cache settings from the timeline, which is WB for CPU + 1-way coherent WB for GPU, because this test is supposed to emulate the behavior of the timeline anyway. Signed-off-by: Fei Yang <fei.yang@intel.com> Reviewed-by: Matt Roper <matthew.d.roper@intel.com> Signed-off-by: Matt Roper <matthew.d.roper@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20230315180800.2632766-1-fei.yang@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 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.