Add TPU Configuration C API

PiperOrigin-RevId: 311082982
Change-Id: I18031e1c84d28b37cbf1cdd68372e351d2da476a

tensorflow/core/tpu/BUILD

@@ -51,3 +51,11 @@ cc_library(
         "//tensorflow/core:lib",
     ],
 )
+
+cc_library(
+    name = "tpu_config_c_api",
+    hdrs = ["tpu_config_c_api.h"],
+    deps = [
+        "//tensorflow/c:tf_status",
+    ],
+)

tensorflow/core/tpu/tpu_config_c_api.h

@@ -0,0 +1,54 @@
+/* Copyright 2020 The TensorFlow Authors. All Rights Reserved.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+==============================================================================*/
+
+#ifndef TENSORFLOW_CORE_TPU_TPU_CONFIG_C_API_H_
+#define TENSORFLOW_CORE_TPU_TPU_CONFIG_C_API_H_
+
+#include <cstddef>
+
+#include "tensorflow/c/tf_status.h"
+
+typedef struct TpuSerializedProto TpuSerializedProto;
+
+extern "C" {
+
+bool TPUHostInitialized();
+
+// TODO(frankchn): Modify API to take in raw values instead of Tensors.
+void ConfigureDistributedTpuOp_DoWork(size_t input_size,
+                                      TpuSerializedProto** inputs,
+                                      TpuSerializedProto* output,
+                                      TF_Status* status);
+
+void WaitForDistributedTpuOp_DoWork(size_t input_size,
+                                    TpuSerializedProto** inputs,
+                                    TpuSerializedProto* output,
+                                    TF_Status* status);
+
+void ShutdownDistributedTpuOp_DoWork(TF_Status* status);
+
+void InitializeHostForDistributedTpuOp_DoWork(
+    size_t input_size, TpuSerializedProto** inputs,
+    bool enable_whole_mesh_compilations, TpuSerializedProto* output,
+    TF_Status* status);
+
+void SetGlobalTPUArrayOp_DoWork(size_t input_size, TpuSerializedProto** inputs,
+                                TF_Status* status);
+
+void DisconnectDistributedTpuChipsOp_DoWork(TpuSerializedProto* output,
+                                            TF_Status* status);
+}
+
+#endif  // TENSORFLOW_CORE_TPU_TPU_CONFIG_C_API_H_