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Once MMIO operations stop being (incorrectly) tied to a GT, we'll still need a backpointer for feature checks, message logging, and tracepoints. Use a tile backpointer since that may allow the most useful debugging output, while also providing access to the xe_device. v2: - Make backpointer an xe_tile instead of xe_device. (Michal) Cc: Michal Wajdeczko <michal.wajdeczko@intel.com> Reviewed-by: Lucas De Marchi <lucas.demarchi@intel.com> # v1 Signed-off-by: Matt Roper <matthew.d.roper@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20240910234719.3335472-52-matthew.d.roper@intel.com