drm/amdgpu: introduce struct amdgpu_bo_user

Implement a new struct amdgpu_bo_user as subclass of
struct amdgpu_bo and a function to created amdgpu_bo_user
bo with a flag to identify the owner.

v2: amdgpu_bo_to_amdgpu_bo_user -> to_amdgpu_bo_user()
Signed-off-by: Nirmoy Das <nirmoy.das@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/amdgpu_object.c

@@ -694,6 +694,34 @@ int amdgpu_bo_create(struct amdgpu_device *adev,
 	return r;
 }
 
+/**
+ * amdgpu_bo_create_user - create an &amdgpu_bo_user 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 user application;
+ *
+ * Returns:
+ * 0 for success or a negative error code on failure.
+ */
+
+int amdgpu_bo_create_user(struct amdgpu_device *adev,
+			  struct amdgpu_bo_param *bp,
+			  struct amdgpu_bo_user **ubo_ptr)
+{
+	struct amdgpu_bo *bo_ptr;
+	int r;
+
+	bp->flags = bp->flags & ~AMDGPU_GEM_CREATE_SHADOW;
+	bp->bo_ptr_size = sizeof(struct amdgpu_bo_user);
+	r = amdgpu_bo_do_create(adev, bp, &bo_ptr);
+	if (r)
+		return r;
+
+	*ubo_ptr = to_amdgpu_bo_user(bo_ptr);
+	return r;
+}
 /**
  * amdgpu_bo_validate - validate an &amdgpu_bo buffer object
  * @bo: pointer to the buffer object

drivers/gpu/drm/amd/amdgpu/amdgpu_object.h

@@ -37,6 +37,8 @@
 #define AMDGPU_BO_INVALID_OFFSET	LONG_MAX
 #define AMDGPU_BO_MAX_PLACEMENTS	3
 
+#define to_amdgpu_bo_user(abo) container_of((abo), struct amdgpu_bo_user, bo)
+
 struct amdgpu_bo_param {
 	unsigned long			size;
 	int				byte_align;
@@ -112,6 +114,15 @@ struct amdgpu_bo {
 	struct kgd_mem                  *kfd_bo;
 };
 
+struct amdgpu_bo_user {
+	struct amdgpu_bo		bo;
+	u64				tiling_flags;
+	u64				metadata_flags;
+	void				*metadata;
+	u32				metadata_size;
+
+};
+
 static inline struct amdgpu_bo *ttm_to_amdgpu_bo(struct ttm_buffer_object *tbo)
 {
 	return container_of(tbo, struct amdgpu_bo, tbo);
@@ -255,6 +266,9 @@ int amdgpu_bo_create_kernel(struct amdgpu_device *adev,
 int amdgpu_bo_create_kernel_at(struct amdgpu_device *adev,
 			       uint64_t offset, uint64_t size, uint32_t domain,
 			       struct amdgpu_bo **bo_ptr, void **cpu_addr);
+int amdgpu_bo_create_user(struct amdgpu_device *adev,
+			  struct amdgpu_bo_param *bp,
+			  struct amdgpu_bo_user **ubo_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);