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In Bug 200588835, the spurious FBPA interrupts are seen on couple of boards. These interrupts were found to be EDC (Error detection and Correction) interrupts which are triggered due to ECC errors. The EDC registers are not exposed to the driver, so the interrupt status register cannot be cleared; resulting in interrupt storm. Also, it was concluded that only bad HW can cause this failure scenario. So, in the ISR for FBPA interrupts, get the GPU into quiesce state as we don't expect the GPU to be in usable state post such unrecoverable errors. Adapt the quiesce code for Linux build too. 1. On Linux, we cannot exit the nvgpu process after quiesce like we do on QNX. So, add nvgpu_disable_irqs() call to quiesce implementation which is done as part of process exit handler on QNX. Masking interrupts which is already done as part of quiesce would be sufficient in most cases, but to be fail-safe disable_irqs too. 3. Also, the IOCTL code looks at g->sw_ready, hence add nvgpu_start_gpu_idle() to set g->sw_ready to false along with setting NVGPU_DRIVER_IS_DYING = true. We expect the nvgpu_sw_quiesce() call to finish before quiesce thread wakes up from 50ms sleep. Hence, critical step like nvgpu_start_gpu_idle() is added to nvgpu_sw_quiesce(), whereas the somewhat redundant disable IRQs call is added to quiesce thread. nvgpu_fifo_quiesce() was called twice by mistake; remove one of the them. Bug 2919899 Bug 200588835 Change-Id: I9beec688c2e1c0d8dfc1327ddf122684576f8684 Signed-off-by: Tejal Kudav <tkudav@nvidia.com> Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvgpu/+/2354537 Reviewed-by: automaticguardword <automaticguardword@nvidia.com> Reviewed-by: Automatic_Commit_Validation_User Reviewed-by: svc-mobile-coverity <svc-mobile-coverity@nvidia.com> Reviewed-by: svc-mobile-cert <svc-mobile-cert@nvidia.com> Reviewed-by: svc-mobile-misra <svc-mobile-misra@nvidia.com> Reviewed-by: Deepak Nibade <dnibade@nvidia.com> Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com> GVS: Gerrit_Virtual_Submit Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>