Deepak Nibade 6eab11c6e8 gpu: nvgpu: gk20a: add busy lock ...

- add rw_semaphore busy_lock for gpu busy() path
- take read lock on busy_lock inside gk20a_busy()
  so that all usual requests can execute simultaneously
- write lock can be taken when we need to block all
  of the gk20a_busy() calls

Bug 1487804

Change-Id: I1b162b38bce9621723d3e45280c6076816cf771a
Signed-off-by: Deepak Nibade <dnibade@nvidia.com>
Reviewed-on: http://git-master/r/412060
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>
Tested-by: Terje Bergstrom <tbergstrom@nvidia.com>

2015-03-18 12:09:53 -07:00

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