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In order to avoid functional breakage of mis-programmed applications that
have grown to depend on unused MOCS entries, we are programming
those entries to be equal to fully cached ("L3 + LLC") entry.
These reserved and unspecified entries should not be used as they may be
changed to less performant variants with better coherency in the future
if more entries are needed.
v2: As suggested by Lucas De Marchi to utilise __init_mocs_table for
programming default value, setting I915_MOCS_PTE index of tgl_mocs_table
with desired value.
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Lucas De Marchi <lucas.demarchi@intel.com>
Cc: Tomasz Lis <tomasz.lis@intel.com>
Cc: Matt Roper <matthew.d.roper@intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Francisco Jerez <currojerez@riseup.net>
Cc: Mathew Alwin <alwin.mathew@intel.com>
Cc: Mcguire Russell W <russell.w.mcguire@intel.com>
Cc: Spruit Neil R <neil.r.spruit@intel.com>
Cc: Zhou Cheng <cheng.zhou@intel.com>
Cc: Benemelis Mike G <mike.g.benemelis@intel.com>
Signed-off-by: Ayaz A Siddiqui <ayaz.siddiqui@intel.com>
Reviewed-by: Lucas De Marchi <lucas.demarchi@intel.com>
Acked-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20200729102539.134731-2-ayaz.siddiqui@intel.com
Cc: stable@vger.kernel.org
(cherry picked from commit 4d8a5cfe3b131f60903949f998c5961cc922e0b0)
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
849c0fe9e8