[PATCH libdrm] amdgpu: add amdgpu_bo_inc_ref() function.

[Qiang Yu]

For Pro OGL be able to work with upstream libdrm.

Signed-off-by: Qiang Yu <Qiang.Yu at amd.com>
Reviewed-by: Christian König <christian.koenig at amd.com>
---
 amdgpu/amdgpu-symbol-check |  1 +
 amdgpu/amdgpu.h            | 15 ++++++++++++++-
 amdgpu/amdgpu_bo.c         |  6 ++++++
 3 files changed, 21 insertions(+), 1 deletion(-)

diff --git a/amdgpu/amdgpu-symbol-check b/amdgpu/amdgpu-symbol-check
index b5e4fe6..487610e 100755
--- a/amdgpu/amdgpu-symbol-check
+++ b/amdgpu/amdgpu-symbol-check
@@ -15,6 +15,7 @@ amdgpu_bo_cpu_map
 amdgpu_bo_cpu_unmap
 amdgpu_bo_export
 amdgpu_bo_free
+amdgpu_bo_inc_ref
 amdgpu_bo_import
 amdgpu_bo_list_create
 amdgpu_bo_list_destroy
diff --git a/amdgpu/amdgpu.h b/amdgpu/amdgpu.h
index a8c353c..e1f93f8 100644
--- a/amdgpu/amdgpu.h
+++ b/amdgpu/amdgpu.h
@@ -721,7 +721,20 @@ int amdgpu_find_bo_by_cpu_mapping(amdgpu_device_handle dev,
 int amdgpu_bo_free(amdgpu_bo_handle buf_handle);
 
 /**
- * Request CPU access to GPU accessible memory
+ * Increase the reference count of a buffer object
+ *
+ * \param   bo - \c [in]  Buffer object handle to increase the reference count
+ *
+ * \return   0 on success\n
+ *          <0 - Negative POSIX Error code
+ *
+ * \sa amdgpu_bo_alloc(), amdgpu_bo_free()
+ *
+*/
+int amdgpu_bo_inc_ref(amdgpu_bo_handle bo);
+
+/**
+ * Request CPU access to GPU accessable memory
  *
  * \param   buf_handle - \c [in] Buffer handle
  * \param   cpu        - \c [out] CPU address to be used for access
diff --git a/amdgpu/amdgpu_bo.c b/amdgpu/amdgpu_bo.c
index a2fc525..dceab01 100644
--- a/amdgpu/amdgpu_bo.c
+++ b/amdgpu/amdgpu_bo.c
@@ -438,6 +438,12 @@ int amdgpu_bo_free(amdgpu_bo_handle buf_handle)
 	return 0;
 }
 
+int amdgpu_bo_inc_ref(amdgpu_bo_handle bo)
+{
+	atomic_inc(&bo->refcount);
+	return 0;
+}
+
 int amdgpu_bo_cpu_map(amdgpu_bo_handle bo, void **cpu)
 {
 	union drm_amdgpu_gem_mmap args;
-- 
1.9.1