gpu: nvgpu: Replace kref for refcounting in nvgpu

- added wrapper struct nvgpu_ref over nvgpu_atomic_t
- added nvgpu_ref_* APIs to access the above struct

JIRA NVGPU-140

Change-Id: Id47f897995dd4721751f7610b6d4d4fbfe4d6b9a
Signed-off-by: Debarshi Dutta <ddutta@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1540899
Reviewed-by: svc-mobile-coverity <svc-mobile-coverity@nvidia.com>
Reviewed-by: svccoveritychecker <svccoveritychecker@nvidia.com>
GVS: Gerrit_Virtual_Submit
Reviewed-by: Konsta Holtta <kholtta@nvidia.com>
Reviewed-by: Vijayakumar Subbu <vsubbu@nvidia.com>

1 files changed, 8 insertions, 0 deletions

diff --git a/drivers/gpu/nvgpu/include/nvgpu/atomic.h b/drivers/gpu/nvgpu/include/nvgpu/atomic.h
index c7a5fcd9..393a9d35 100644
--- a/drivers/gpu/nvgpu/include/nvgpu/atomic.h
+++ b/drivers/gpu/nvgpu/include/nvgpu/atomic.h
@@ -61,10 +61,18 @@ static inline bool nvgpu_atomic_dec_and_test(nvgpu_atomic_t *v)
 {
         return __nvgpu_atomic_dec_and_test(v);
 }
+static inline bool nvgpu_atomic_sub_and_test(int i, nvgpu_atomic_t *v)
+{
+        return __nvgpu_atomic_sub_and_test(i, v);
+}
 static inline int nvgpu_atomic_add_return(int i, nvgpu_atomic_t *v)
 {
         return __nvgpu_atomic_add_return(i, v);
 }
+static inline int nvgpu_atomic_add_unless(nvgpu_atomic_t *v, int a, int u)
+{
+        return __nvgpu_atomic_add_unless(v, a, u);
+}
 static inline void nvgpu_atomic64_set(nvgpu_atomic64_t *v, long i)
 {
         return  __nvgpu_atomic64_set(v, i);