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Nvgpu does not support nested interrupts and as a result priv/pbus interrupt do not reach cpu while other interrupts on intr_0 (stall) tree are being processed. This issue is not specific to priv/pbus but since pbus errors are critical, it is important to detect it early on. Below is the snippet from one of the failing logs where nvgpu is doing recovery to process gr interrupt. Right after GR engine is reset (PGRAPH of PMC_ENABLE), failing priv accesses should have triggered pbus interrupt but it does not reach cpu until gr interrupt is handled. Any interrupt that requires recovery will take longer to finish isr as recovery is done as part of isr. Also intr_0 (stall) interrupts are paused while stall interrupt is being processed. gm20b_gr_falcon_bind_instblk:147 [ERR] arbiter idle timeout, status: badf1020 gm20b_gr_falcon_wait_for_fecs_arb_idle:125 [ERR] arbiter idle timeout, fecs ctxsw status: 0xbadf1020 Fix to detect pbus intr while other stall interrupts are being processed is to move pbus intr enable/disable/clear/handle to nonstall (intr_1) tree. Configure pbus_intr_en_1 to route pbus to nostall tree. Priv interrupts cannot be moved to nonstall (intr_1) tree due to h/w not supporting this. In Turing, moving pbus intr to nonstall is not feasible as mc_intr(1) tree is deprecated. Add Turing specific stall intr handler hals with original logic to route pbus intr to mc_intr(0). JIRA NVGPU-25 Bug 200603566 Change-Id: I36fc376800802f20a0ea581b4f787bcc6c73ec7e Signed-off-by: Seema Khowala <seemaj@nvidia.com> Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvgpu/+/2354192 Tested-by: mobile promotions <svcmobile_promotions@nvidia.com> Reviewed-by: automaticguardword <automaticguardword@nvidia.com> Reviewed-by: svc-mobile-coverity <svc-mobile-coverity@nvidia.com> Reviewed-by: svc-mobile-misra <svc-mobile-misra@nvidia.com> Reviewed-by: svc-mobile-cert <svc-mobile-cert@nvidia.com> Reviewed-by: Deepak Nibade <dnibade@nvidia.com> Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com> GVS: Gerrit_Virtual_Submit