Divya 3e6d61b177 gpu: nvgpu: wake up gr wait wq in rmmod path ...

- The pmu_pg_task thread remains alive in the background
  during railgate and rail-ungate.
- During rail-ungate, the PG task thread starts again and
  executes PG-related tasks.
- It comes in pmu_pg_init_powergating() and waits for GR
  initialization. Here it waits for gr to be initialized.
- In parallel, the main GPU thread works on rmmod (from
  gpu_module_reload test).
- By this time, the main gpu thread has started rmmod and
  gr->initialized can be set to false, thus causing an uninterruptible
  wait for pmu_pg_task thread.
- To solve this, wake gr wait wq in rmmod path when
  NVGPU_DRIVER_IS_DYING and NVGPU_KERNEL_IS_DYING flgas are set.

Bug 3806514

Change-Id: Id78d92f30b75aba1aee22398cc86a3acebd50ef6
Signed-off-by: Divya <dsinghatwari@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvgpu/+/2798003
(cherry picked from commit d9345065bcb6d9ff497c127fa4cd52077f4ecfa4)
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvgpu/+/2807245
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: Vijayakumar Subbu <vsubbu@nvidia.com>
GVS: Gerrit_Virtual_Submit <buildbot_gerritrpt@nvidia.com>

2022-11-21 04:19:18 -08:00

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