Sagar Kamble 13fc430775 gpu: nvgpu: retry tsg unbind if NEXT is set ...

The NEXT bit can remain set for the channel if timeslice expires before
scheduler clears it. Due to this nvgpu fails TSG unbind and in turn
nvrm_gpu fails channel close. In this case, checking the channel hw
state after some time can help see NEXT bit cleared by scheduler.

Reenable the tsg and return -EAGAIN to nvrm_gpu for it to retry again.

Bug 3144960
Bug 200520811

Change-Id: I35f417f02270e371a4e632986b73a00f8a4f921a
Signed-off-by: Sagar Kamble <skamble@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvgpu/+/2468391
(cherry picked from commit cf287a4ef5)
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvgpu/+/2479106
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>
Reviewed-by: Deepak Nibade <dnibade@nvidia.com>
Reviewed-by: svc-mobile-coverity <svc-mobile-coverity@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
GVS: Gerrit_Virtual_Submit

2021-03-19 14:39:39 -07:00

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