f8577fb3c2
Under moderate amounts of GPU stress, we can observe on Bearlake and Pineview (later gen3 models) that we execute the following batch buffer before the write into the batch is coherent. Adding extra (tested with upto 32x) MI_FLUSH to either the invalidation, flush or both phases does not solve the incoherency issue with the relocations, but emitting the MI_STORE_DWORD_IMM twice does. So be it. Fixes:7dd4f6729f("drm/i915: Async GPU relocation processing") Testcase: igt/gem_tiled_fence_blits # blb/pnv Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com> Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20181119154153.15327-1-chris@chris-wilson.co.uk (cherry picked from commit7fa28e1469) Signed-off-by: Joonas Lahtinen <joonas.lahtinen@linux.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.