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Fault can be injected with below steps. FAILTYPE=fail_function FAILFUNC=xe_guc_mmio_send_recv echo > /sys/kernel/debug/$FAILTYPE/inject echo $FAILFUNC > /sys/kernel/debug/$FAILTYPE/inject printf %#x -5 > /sys/kernel/debug/$FAILTYPE/$FAILFUNC/retval echo N > /sys/kernel/debug/$FAILTYPE/task-filter echo 10 > /sys/kernel/debug/$FAILTYPE/probability echo 0 > /sys/kernel/debug/$FAILTYPE/interval echo -1 > /sys/kernel/debug/$FAILTYPE/times echo 0 > /sys/kernel/debug/$FAILTYPE/space echo 1 > /sys/kernel/debug/$FAILTYPE/verbose Signed-off-by: Satyanarayana K V P <satyanarayana.k.v.p@intel.com> Cc: Matthew Brost <matthew.brost@intel.com> Cc: Michał Wajdeczko <michal.wajdeczko@intel.com> Reviewed-by: Michal Wajdeczko <michal.wajdeczko@intel.com> Signed-off-by: Michal Wajdeczko <michal.wajdeczko@intel.com> Link: https://lore.kernel.org/r/20250403120641.7258-2-satyanarayana.k.v.p@intel.com