Deepak Nibade 9713e3572a gpu: nvgpu: disable ctxsw instead of all engines activity ...

In gk20a_channel_timeout_handler(), we currently disable
all engine activity before checking for fence completion
and before we identify timed out channel

But disabling all engine activity could be overkill for
this process.

Also, as part of disabling engine activity we preempt
the channel on engine.
But it is possible that channel preemption times out
since channel has already timed out
And this can lead to races and deadlock

Hence, instead of disabling all engine activity, just
disable the context switch which should also do the
same trick

Bug 1716062

Change-Id: I596515ed670a2e134f7bcd9758488a4aa0bf16f7
Signed-off-by: Deepak Nibade <dnibade@nvidia.com>
Reviewed-on: http://git-master/r/929421
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>
Tested-by: Terje Bergstrom <tbergstrom@nvidia.com>

2016-01-11 09:05:58 -08:00

..

gpu/nvgpu

gpu: nvgpu: disable ctxsw instead of all engines activity

2016-01-11 09:05:58 -08:00