gpu: nvgpu: add nvgpu_current_time_ns()

Add an abstraction over a monotonic system clock in nanosecond units.
Use ktime_get() for the Linux implementation, similarly to
nvgpu_current_time_ms().

Jira NVGPU-708

Change-Id: I3165c20abf2652f1a1fa04e66c04cd34a8fe6dcc
Signed-off-by: Konsta Holtta <kholtta@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1723201
Reviewed-by: svc-mobile-coverity <svc-mobile-coverity@nvidia.com>
Reviewed-by: Deepak Nibade <dnibade@nvidia.com>
Reviewed-by: Sourab Gupta <sourabg@nvidia.com>
Reviewed-by: Alex Waterman <alexw@nvidia.com>
GVS: Gerrit_Virtual_Submit
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/drivers/gpu/nvgpu/include/nvgpu/timers.h b/drivers/gpu/nvgpu/include/nvgpu/timers.h
index 2e260619..83dd8d78 100644
--- a/drivers/gpu/nvgpu/include/nvgpu/timers.h
+++ b/drivers/gpu/nvgpu/include/nvgpu/timers.h
@@ -109,6 +109,7 @@ void nvgpu_udelay(unsigned int usecs);
  * Timekeeping.
  */
 s64 nvgpu_current_time_ms(void);
+s64 nvgpu_current_time_ns(void);
 u64 nvgpu_hr_timestamp(void);
 
 #endif