[PATCH v3][libdrm] amdgpu: add amdgpu_bo_inc_ref() function.

[Qiang Yu]

From: Qiang Yu <Qiang.Yu at amd.com>

Change-Id: Icdc00d3e22e48120ca6f4d73ffd05ba43551ad2c
Signed-off-by: Qiang Yu <Qiang.Yu at amd.com>
---
 amdgpu/amdgpu.h    | 13 +++++++++++++
 amdgpu/amdgpu_bo.c |  6 ++++++
 2 files changed, 19 insertions(+)

diff --git a/amdgpu/amdgpu.h b/amdgpu/amdgpu.h
index 693d841..d8c436f 100644
--- a/amdgpu/amdgpu.h
+++ b/amdgpu/amdgpu.h
@@ -716,6 +716,19 @@ int amdgpu_find_bo_by_cpu_mapping(amdgpu_device_handle dev,
 int amdgpu_bo_free(amdgpu_bo_handle buf_handle);
 
 /**
+ * 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
diff --git a/amdgpu/amdgpu_bo.c b/amdgpu/amdgpu_bo.c
index aa0d001..c3f5fb9 100644
--- a/amdgpu/amdgpu_bo.c
+++ b/amdgpu/amdgpu_bo.c
@@ -424,6 +424,12 @@ 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