[PATCH 1/4] drm/amdgpu: introduce struct amdgpu_bo_dmabuf

[Nirmoy Das]

Implement a new struct amdgpu_bo_dmabuf as subclass of
struct amdgpu_bo and a function to create amdgpu_bo_dmabuf
bo.

Signed-off-by: Nirmoy Das <nirmoy.das at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_object.c | 30 ++++++++++++++++++++++
 drivers/gpu/drm/amd/amdgpu/amdgpu_object.h |  9 +++++++
 2 files changed, 39 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
index fdf23e439b42..fa4686fe95c4 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
@@ -727,6 +727,36 @@ int amdgpu_bo_create_user(struct amdgpu_device *adev,
 	*ubo_ptr = to_amdgpu_bo_user(bo_ptr);
 	return r;
 }
+
+/**
+ * amdgpu_bo_create_dmabuf - create an &amdgpu_bo_dmabuf buffer object
+ * @adev: amdgpu device object
+ * @bp: parameters to be used for the buffer object
+ * @ubo_ptr: pointer to the buffer object pointer
+ *
+ * Create a BO to be used by prime BO export;
+ *
+ * Returns:
+ * 0 for success or a negative error code on failure.
+ */
+
+int amdgpu_bo_create_dmabuf(struct amdgpu_device *adev,
+			    struct amdgpu_bo_param *bp,
+			    struct amdgpu_bo_dmabuf **dbo_ptr)
+{
+	struct amdgpu_bo *bo_ptr;
+	int r;
+
+	bp->flags = bp->flags & ~AMDGPU_GEM_CREATE_SHADOW;
+	bp->bo_ptr_size = sizeof(struct amdgpu_bo_dmabuf);
+	r = amdgpu_bo_do_create(adev, bp, &bo_ptr);
+	if (r)
+		return r;
+
+	*dbo_ptr = to_amdgpu_bo_dmabuf(bo_ptr);
+	return r;
+}
+
 /**
  * amdgpu_bo_validate - validate an &amdgpu_bo buffer object
  * @bo: pointer to the buffer object
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.h
index 25411b2c4dd9..4b9339c3f3eb 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.h
@@ -38,6 +38,7 @@
 #define AMDGPU_BO_MAX_PLACEMENTS	3
 
 #define to_amdgpu_bo_user(abo) container_of((abo), struct amdgpu_bo_user, bo)
+#define to_amdgpu_bo_dmabuf(abo) container_of((abo), struct amdgpu_bo_dmabuf, bo)
 
 struct amdgpu_bo_param {
 	unsigned long			size;
@@ -119,6 +120,11 @@ struct amdgpu_bo_user {
 
 };
 
+struct amdgpu_bo_dmabuf {
+	struct amdgpu_bo		bo;
+	unsigned int			prime_shared_count;
+};
+
 static inline struct amdgpu_bo *ttm_to_amdgpu_bo(struct ttm_buffer_object *tbo)
 {
 	return container_of(tbo, struct amdgpu_bo, tbo);
@@ -265,6 +271,9 @@ int amdgpu_bo_create_kernel_at(struct amdgpu_device *adev,
 int amdgpu_bo_create_user(struct amdgpu_device *adev,
 			  struct amdgpu_bo_param *bp,
 			  struct amdgpu_bo_user **ubo_ptr);
+int amdgpu_bo_create_dmabuf(struct amdgpu_device *adev,
+			    struct amdgpu_bo_param *bp,
+			    struct amdgpu_bo_dmabuf **dbo_ptr);
 void amdgpu_bo_free_kernel(struct amdgpu_bo **bo, u64 *gpu_addr,
 			   void **cpu_addr);
 int amdgpu_bo_kmap(struct amdgpu_bo *bo, void **ptr);
-- 
2.30.1