gpu: nvgpu: refactor interrupt handling

JIRA: EVLR-1004

(*) Refactor the non-stalling interrupt path to execute clear on the
top half, so on dGPU case processing of stalling interrupts does not
block non-stalling one.
(*) Use a worker thread to do semaphore wakeups and allow batching of
the non-stalling operations.
(*) Fix a bug where some gpus will not properly track the completion
of interrupts, preventing safe driver unloads

Change-Id: Icc90a3acba544c97ec6a9285ab235d337ab9eefa
Signed-off-by: David Nieto <dmartineznie@nvidia.com>
Reviewed-on: http://git-master/r/1312796
Reviewed-by: svccoveritychecker <svccoveritychecker@nvidia.com>
GVS: Gerrit_Virtual_Submit
Reviewed-by: Lakshmanan M <lm@nvidia.com>
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>
Reviewed-by: Navneet Kumar <navneetk@nvidia.com>

1 files changed, 3 insertions, 2 deletions

diff --git a/drivers/gpu/nvgpu/gk20a/mc_gk20a.h b/drivers/gpu/nvgpu/gk20a/mc_gk20a.h
index 4bb3e118..1aad1a0b 100644
--- a/drivers/gpu/nvgpu/gk20a/mc_gk20a.h
+++ b/drivers/gpu/nvgpu/gk20a/mc_gk20a.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2014, NVIDIA CORPORATION.  All rights reserved.
+ * Copyright (c) 2014-2017, 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,
@@ -22,5 +22,6 @@ void mc_gk20a_intr_unit_config(struct gk20a *g, bool enable,
 irqreturn_t mc_gk20a_isr_stall(struct gk20a *g);
 irqreturn_t mc_gk20a_isr_nonstall(struct gk20a *g);
 irqreturn_t mc_gk20a_intr_thread_stall(struct gk20a *g);
-irqreturn_t mc_gk20a_intr_thread_nonstall(struct gk20a *g);
+void mc_gk20a_intr_thread_nonstall(struct gk20a *g, u32 intr);
+void mc_gk20a_nonstall_cb(struct work_struct *work);
 #endif