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Reprogramming the LNCF MOCS registers on render domain reset is not intended to be regular driver programming, but rather the implementation of a specific workaround (Wa_1607983814). This workaround no longer applies on Xe_HP any beyond, so we can expect that these registers, like the rest of the LNCF/LBCF registers, will maintain their values through all engine resets. We should only add these registers to the GuC's save/restore list on platforms that need the workaround. Furthermore, xe_mocs_init_engine() appears to be another attempt to satisfy this same workaround. This is unnecessary on the Xe driver since even on platforms where the workaround is necessary, all single-engine resets are initiated by the GuC and thus the GuC will take care of saving/restoring these registers. The only host-initiated resets we have in Xe are full GT resets which will already (re)initialize these registers as part of the regular xe_mocs_init() flow. v2: - Add needs_wa_1607983814() so that calculate_regset_size() doesn't overallocate regset space when the workaround isn't needed. (Lucas) - On platforms affected by Wa_1607983814, only add the LNCF MOCS registers to the render engine's GuC save/restore list; resets of other engines don't need to save/restore these. Cc: Lucas De Marchi <lucas.demarchi@intel.com> Signed-off-by: Matt Roper <matthew.d.roper@intel.com> Reviewed-by: Lucas De Marchi <lucas.demarchi@intel.com> Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com> |
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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 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.