gpu: nvgpu: post dbg session event from os specific code

As part of debug session unification following changes are
required.

-Including bug.h header file to fix the compilation issue
on QNX

- The mechanism of posting debug events is OS specific. In Linux
this works through poll fd, wherein we can make use of nvgpu_cond
variables to poll and trigger the corresponding wait_queue
via nvgpu_cond_broadcast_interruptible() call.

The post event functionality on QNX doesn't work on poll though.
It uses iofunc_notify_trigger to post the debug events to calling
process. As such QNX can't work with nvgpu_cond's.

To overcome this issue, it is proposed to create a OS specific
interface for posting debugger events. Linux can call
nvgpu_cond_broadcast_interruptible() in its implementation, which
makes sense since these are already initialized and poll'ed in the
Linux specific code only.
QNX can implement this interface to call iofunc_notify_* functions,
as per its need

Jira VQRM-2363

Change-Id: I0abdc0787f771040b8aff5384290d7e6549f81fb
Signed-off-by: Sourab Gupta <sourabg@nvidia.com>
Signed-off-by: Prateek Sethi <prsethi@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1696368
Reviewed-by: svc-mobile-coverity <svc-mobile-coverity@nvidia.com>
GVS: Gerrit_Virtual_Submit
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>
Reviewed-by: Richard Zhao <rizhao@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>

3 files changed, 10 insertions, 3 deletions

diff --git a/drivers/gpu/nvgpu/common/linux/ioctl_dbg.c b/drivers/gpu/nvgpu/common/linux/ioctl_dbg.c
index a15ac344..d288280e 100644
--- a/drivers/gpu/nvgpu/common/linux/ioctl_dbg.c
+++ b/drivers/gpu/nvgpu/common/linux/ioctl_dbg.c
@@ -468,6 +468,11 @@ free_ref:
         return err;
 }
 
+void nvgpu_dbg_session_post_event(struct dbg_session_gk20a *dbg_s)
+{
+        nvgpu_cond_broadcast_interruptible(&dbg_s->dbg_events.wait_queue);
+}
+
 static int dbg_unbind_single_channel_gk20a(struct dbg_session_gk20a *dbg_s,
                         struct dbg_session_channel_data *ch_data)
 {
diff --git a/drivers/gpu/nvgpu/gk20a/dbg_gpu_gk20a.c b/drivers/gpu/nvgpu/gk20a/dbg_gpu_gk20a.c
index 5d428afa..ce06e78b 100644
--- a/drivers/gpu/nvgpu/gk20a/dbg_gpu_gk20a.c
+++ b/drivers/gpu/nvgpu/gk20a/dbg_gpu_gk20a.c
@@ -1,7 +1,7 @@
 /*
  * Tegra GK20A GPU Debugger/Profiler Driver
  *
- * Copyright (c) 2013-2017, NVIDIA CORPORATION.  All rights reserved.
+ * Copyright (c) 2013-2018, NVIDIA CORPORATION.  All rights reserved.
  *
  * Permission is hereby granted, free of charge, to any person obtaining a
  * copy of this software and associated documentation files (the "Software"),
@@ -27,6 +27,7 @@
 #include <nvgpu/vm.h>
 #include <nvgpu/atomic.h>
 #include <nvgpu/mm.h>
+#include <nvgpu/bug.h>
 
 #include "gk20a.h"
 #include "gr_gk20a.h"
@@ -106,7 +107,7 @@ void gk20a_dbg_gpu_post_events(struct channel_gk20a *ch)
 
                         dbg_s->dbg_events.num_pending_events++;
 
-                        nvgpu_cond_broadcast_interruptible(&dbg_s->dbg_events.wait_queue);
+                        nvgpu_dbg_session_post_event(dbg_s);
                 }
         }
 
diff --git a/drivers/gpu/nvgpu/gk20a/dbg_gpu_gk20a.h b/drivers/gpu/nvgpu/gk20a/dbg_gpu_gk20a.h
index 28db053c..b714a648 100644
--- a/drivers/gpu/nvgpu/gk20a/dbg_gpu_gk20a.h
+++ b/drivers/gpu/nvgpu/gk20a/dbg_gpu_gk20a.h
@@ -1,7 +1,7 @@
 /*
  * Tegra GK20A GPU Debugger Driver
  *
- * Copyright (c) 2013-2017, NVIDIA CORPORATION.  All rights reserved.
+ * Copyright (c) 2013-2018, NVIDIA CORPORATION.  All rights reserved.
  *
  * Permission is hereby granted, free of charge, to any person obtaining a
  * copy of this software and associated documentation files (the "Software"),
@@ -132,4 +132,5 @@ void nvgpu_release_profiler_reservation(struct dbg_session_gk20a *dbg_s,
 int gk20a_perfbuf_enable_locked(struct gk20a *g, u64 offset, u32 size);
 int gk20a_perfbuf_disable_locked(struct gk20a *g);
 
+void nvgpu_dbg_session_post_event(struct dbg_session_gk20a *dbg_s);
 #endif /* DBG_GPU_GK20A_H */