gpu: nvgpu: IOCTL to disable watchdog per-channel

Add IOCTL NVGPU_IOCTL_CHANNEL_WDT to disable/enable
watchdog per-channel

Also, if watchdog is disabled, we currently schedule
the worker with MAX timeout.
Instead of this, do not schedule any worker if
watchdog is disabled

Bug 1683059
Bug 1700277

Change-Id: I7f6bec84adeedb74e014ed6d1471317b854df84c
Signed-off-by: Deepak Nibade <dnibade@nvidia.com>
Reviewed-on: http://git-master/r/837962
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>
Tested-by: Terje Bergstrom <tbergstrom@nvidia.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/drivers/gpu/nvgpu/gk20a/channel_gk20a.h b/drivers/gpu/nvgpu/gk20a/channel_gk20a.h
index 245db56a..55528dd9 100644
--- a/drivers/gpu/nvgpu/gk20a/channel_gk20a.h
+++ b/drivers/gpu/nvgpu/gk20a/channel_gk20a.h
@@ -92,6 +92,7 @@ struct channel_gk20a {
         wait_queue_head_t ref_count_dec_wq;
 
         int hw_chid;
+        bool wdt_enabled;
         bool bound;
         bool first_init;
         bool vpr;