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When we map BO in GGTT, then by default we are using PAT index that corresponds to XE_CACHE_WB but ppcoming feature will require use of the PAT index of the XE_CACHE_UC. Define new BO flag that could be used during BO creation to force alternate caching. Cc: Matt Roper <matthew.d.roper@intel.com> Reviewed-by: Matt Roper <matthew.d.roper@intel.com> Link: https://lore.kernel.org/r/20231214185955.1791-7-michal.wajdeczko@intel.com Signed-off-by: Michal Wajdeczko <michal.wajdeczko@intel.com>