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Many selftests call igt_flush_test() on cleanup. With default preemption timeout of compute engines raised to 7.5 seconds, hardcoded flush timeout of 3 seconds is too short. That results in GPU forcibly wedged and kernel taineted, then IGT abort triggered. CI BAT runs loose a part of their expected coverage. Calculate the flush timeout based on the longest preemption timeout currently configured for any engine. That way, selftest can still report detected issues as non-critical, and the GPU gets a chance to recover from preemptible hangs and prepare for fluent execution of next test cases. Link: https://gitlab.freedesktop.org/drm/i915/kernel/-/issues/12061 Signed-off-by: Janusz Krzysztofik <janusz.krzysztofik@linux.intel.com> Reviewed-by: Andi Shyti <andi.shyti@linux.intel.com> Signed-off-by: Andi Shyti <andi.shyti@kernel.org> Link: https://patchwork.freedesktop.org/patch/msgid/20241213190122.513709-2-janusz.krzysztofik@linux.intel.com