gpu: nvgpu: enable semaphore acquire timeout

It'll detect dead semaphore acquire. The worst case is when
ACQUIRE_SWITCH is disabled, semaphore acquire will poll and
consume full gpu timeslicees.

The timeout value is set to half of channel WDT.

Bug 1636800

Change-Id: Ida6ccc534006a191513edf47e7b82d4b5b758684
Signed-off-by: Richard Zhao <rizhao@nvidia.com>
Reviewed-on: http://git-master/r/928827
GVS: Gerrit_Virtual_Submit
Reviewed-by: Vladislav Buzov <vbuzov@nvidia.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/drivers/gpu/nvgpu/gk20a/channel_gk20a.h b/drivers/gpu/nvgpu/gk20a/channel_gk20a.h
index f62d2731..ddc517b9 100644
--- a/drivers/gpu/nvgpu/gk20a/channel_gk20a.h
+++ b/drivers/gpu/nvgpu/gk20a/channel_gk20a.h
@@ -1,7 +1,7 @@
 /*
  * GK20A graphics channel
  *
- * Copyright (c) 2011-2015, NVIDIA CORPORATION.  All rights reserved.
+ * Copyright (c) 2011-2016, NVIDIA CORPORATION.  All rights reserved.
  *
  * This program is free software; you can redistribute it and/or modify it
  * under the terms and conditions of the GNU General Public License,
@@ -252,6 +252,7 @@ void channel_gk20a_unbind(struct channel_gk20a *ch_gk20a);
 void channel_gk20a_disable(struct channel_gk20a *ch);
 int channel_gk20a_alloc_inst(struct gk20a *g, struct channel_gk20a *ch);
 void channel_gk20a_free_inst(struct gk20a *g, struct channel_gk20a *ch);
+u32 channel_gk20a_pbdma_acquire_val(struct channel_gk20a *c);
 int channel_gk20a_setup_ramfc(struct channel_gk20a *c,
                         u64 gpfifo_base, u32 gpfifo_entries, u32 flags);
 void channel_gk20a_enable(struct channel_gk20a *ch);