Reference: https://bugs.freedesktop.org/show_bug.cgi?id=112126 The issue we hit is the GPU keeps very high load after running the subtest min-max-config-loaded. Some background of the issue: Currently the rps is not fully enabled yet on TGL, and running the subtest min-max-config-loaded will hit below assertion: == (i915_pm_rps:1261) CRITICAL: Test assertion failure function loaded_check, file ../tests/i915/i915_pm_rps.c:505: (i915_pm_rps:1261) CRITICAL: Failed assertion: freqs[MAX] <= freqs[CUR] (i915_pm_rps:1261) CRITICAL: Last errno: 2, No such file or directory == with igt stress test, we find the GT keeps busy after running this subtest, it is due to the igt_spin_end() is not called randomly. The root cause analysis is: When the main process i915_pm_rps for running the subtest min-max-config-loaded hits the assertion, the main process will try to send signal SIGTERM to the child process loader_helper which is created by main process for starting GT load, then the main process itself will exit. The SIGTERM handler for loader_helper is the default one, which will cause the loader_helper exits directly. That is unsafe, we always expect the igt_spin_end() is called before loader_helper process exits, which is used to stop the load of GT. Furthermore, in normal scenario, before main process exits, it will send SIGUSR1 to child process for stopping GT loading in safe way. So here we install the proper handler for signal SIGTERM in the similar way. Without this patch, the GT may keep busy after running this subtest. Enabling rps should be tracked on the other side. Signed-off-by: Chuansheng Liu <chuansheng.liu@xxxxxxxxx> --- tests/i915/i915_pm_rps.c | 1 + 1 file changed, 1 insertion(+) diff --git a/tests/i915/i915_pm_rps.c b/tests/i915/i915_pm_rps.c index ef627c0b..8c71c1a1 100644 --- a/tests/i915/i915_pm_rps.c +++ b/tests/i915/i915_pm_rps.c @@ -252,6 +252,7 @@ static void load_helper_run(enum load load) signal(SIGUSR1, load_helper_signal_handler); signal(SIGUSR2, load_helper_signal_handler); + signal(SIGTERM, load_helper_signal_handler); igt_debug("Applying %s load...\n", lh.load ? "high" : "low"); -- 2.17.1 _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/intel-gfx
