Debarshi Dutta 053d0a416e gpu: nvgpu: change system suspend's implementation ...

Currently, for platforms with canRailgate device characteristics disabled,
suspend can block as deterministic channels hold busy references. This
patch makes the change to first hold off any new jobs for deterministic
channels and then reverts back the busy references taken by those
channels. Following this, suspend also waits for the device to get idle
by waiting (with timeout) for the nvgpu's internal usage counter to be
come zero. This ensures there are no further jobs in progress and
allows the system to go into a suspend state.

Bug 200598228
Bug 2930266

Change-Id: Id02b4d41a9c2dd64303b2e2449dbed48c12aea4c
Signed-off-by: Debarshi Dutta <ddutta@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvgpu/+/2328489
(cherry picked from commit 9d1e07ca18)
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvgpu/+/2342383
Reviewed-by: automaticguardword <automaticguardword@nvidia.com>
Reviewed-by: Automatic_Commit_Validation_User
Reviewed-by: Amulya Yarlagadda <ayarlagadda@nvidia.com>
GVS: Gerrit_Virtual_Submit
Tested-by: Amulya Yarlagadda <ayarlagadda@nvidia.com>

2020-05-11 21:08:30 -07:00

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