gpu: nvgpu: Provide cpu gpu time correlation via ioctl

bug 1648908

Provides pairs of CPU and GPU timestamps that
can be used for correlatiing the two timebases

- IOCTL made available /dev/nvhost-ctrl-gpu

Change-Id: I1458b9d33d794b1b02ec9fd29ed9426756b94bcd
Signed-off-by: Arul Sekar <aruls@nvidia.com>
Reviewed-on: http://git-master/r/1029732
Reviewed-by: Arun Gona <agona@nvidia.com>
Tested-by: Arun Gona <agona@nvidia.com>
Reviewed-on: http://git-master/r/1111715
GVS: Gerrit_Virtual_Submit
Reviewed-by: Thomas Fleury <tfleury@nvidia.com>
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>

1 files changed, 9 insertions, 1 deletions

diff --git a/drivers/gpu/nvgpu/gm20b/hw_timer_gm20b.h b/drivers/gpu/nvgpu/gm20b/hw_timer_gm20b.h
index 126f7c8c..06d02522 100644
--- a/drivers/gpu/nvgpu/gm20b/hw_timer_gm20b.h
+++ b/drivers/gpu/nvgpu/gm20b/hw_timer_gm20b.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2014, NVIDIA CORPORATION.  All rights reserved.
+ * Copyright (c) 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,
@@ -98,4 +98,12 @@ static inline u32 timer_pri_timeout_fecs_errcode_r(void)
 {
         return 0x0000908c;
 }
+static inline u32 timer_time_0_r(void)
+{
+        return 0x00009400;
+}
+static inline u32 timer_time_1_r(void)
+{
+        return 0x00009410;
+}
 #endif