[rpc] Implemented rpc logging

CMakeLists.txt

@@ -317,6 +317,7 @@ list(APPEND COMPILER_SRCS "src/target/datatype/myfloat/myfloat.cc")
 tvm_file_glob(GLOB RUNTIME_SRCS
   src/runtime/*.cc
   src/runtime/vm/*.cc
+  src/runtime/minrpc/*.cc
 )
 
 if(BUILD_FOR_HEXAGON)

python/tvm/micro/session.py

@@ -133,6 +133,7 @@ def __enter__(self):
                     int(timeouts.session_start_timeout_sec * 1e6),
                     int(timeouts.session_established_timeout_sec * 1e6),
                     self._cleanup,
+                    False,
                 )
             )
             self.device = self._rpc.cpu(0)

python/tvm/rpc/client.py

@@ -459,7 +459,9 @@ def request_and_run(self, key, func, priority=1, session_timeout=0, max_retry=2)
         )
 
 
-def connect(url, port, key="", session_timeout=0, session_constructor_args=None):
+def connect(
+    url, port, key="", session_timeout=0, session_constructor_args=None, enable_logging=False
+):
     """Connect to RPC Server
 
     Parameters
@@ -483,6 +485,9 @@ def connect(url, port, key="", session_timeout=0, session_constructor_args=None)
         The first element of the list is always a string specifying the name of
         the session constructor, the following args are the positional args to that function.
 
+    enable_logging: boolean
+        flag to enable/disable logging. Logging is disabled by default.
+
     Returns
     -------
     sess : RPCSession
@@ -503,9 +508,9 @@ def connect(url, port, key="", session_timeout=0, session_constructor_args=None)
     .. code-block:: python
 
         client_via_proxy = rpc.connect(
-            proxy_server_url, proxy_server_port, proxy_server_key,
+            proxy_server_url, proxy_server_port, proxy_server_key, enable_logging
             session_constructor_args=[
-                "rpc.Connect", internal_url, internal_port, internal_key])
+                "rpc.Connect", internal_url, internal_port, internal_key, internal_logging])
 
     """
     try:
@@ -514,7 +519,7 @@ def connect(url, port, key="", session_timeout=0, session_constructor_args=None)
         session_constructor_args = session_constructor_args if session_constructor_args else []
         if not isinstance(session_constructor_args, (list, tuple)):
             raise TypeError("Expect the session constructor to be a list or tuple")
-        sess = _ffi_api.Connect(url, port, key, *session_constructor_args)
+        sess = _ffi_api.Connect(url, port, key, enable_logging, *session_constructor_args)
     except NameError:
         raise RuntimeError("Please compile with USE_RPC=1")
     return RPCSession(sess)

src/runtime/crt/microtvm_rpc_server/rpc_server.cc

@@ -193,8 +193,6 @@ class MicroRPCServer {
 }  // namespace runtime
 }  // namespace tvm
 
-void* operator new[](size_t count, void* ptr) noexcept { return ptr; }
-
 extern "C" {
 
 static microtvm_rpc_server_t g_rpc_server = nullptr;

src/runtime/micro/micro_session.cc

@@ -38,6 +38,7 @@
 
 #include "../../support/str_escape.h"
 #include "../rpc/rpc_channel.h"
+#include "../rpc/rpc_channel_logger.h"
 #include "../rpc/rpc_endpoint.h"
 #include "../rpc/rpc_session.h"
 #include "crt_config.h"
@@ -404,6 +405,13 @@ TVM_REGISTER_GLOBAL("micro._rpc_connect").set_body([](TVMArgs args, TVMRetValue*
     throw std::runtime_error(ss.str());
   }
   std::unique_ptr<RPCChannel> channel(micro_channel);
+  bool enable_logging = false;
+  if (args.num_args > 7) {
+    enable_logging = args[7];
+  }
+  if (enable_logging) {
+    channel.reset(new RPCChannelLogging(std::move(channel)));
+  }
   auto ep = RPCEndpoint::Create(std::move(channel), args[0], "", args[6]);
   auto sess = CreateClientSession(ep);
   *rv = CreateRPCSessionModule(sess);

src/runtime/minrpc/minrpc_interfaces.h

@@ -0,0 +1,93 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you 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 TVM_RUNTIME_MINRPC_MINRPC_INTERFACES_H_
+#define TVM_RUNTIME_MINRPC_MINRPC_INTERFACES_H_
+
+#include <tvm/runtime/c_runtime_api.h>
+
+#include "rpc_reference.h"
+
+namespace tvm {
+namespace runtime {
+
+/*!
+ * \brief Return interface used in ExecInterface to generate and send the responses.
+ */
+class MinRPCReturnInterface {
+ public:
+  virtual ~MinRPCReturnInterface() {}
+  /*! * \brief sends a response to the client with kTVMNullptr in payload. */
+  virtual void ReturnVoid() = 0;
+
+  /*! * \brief sends a response to the client with one kTVMOpaqueHandle in payload. */
+  virtual void ReturnHandle(void* handle) = 0;
+
+  /*! * \brief sends an exception response to the client with a kTVMStr in payload. */
+  virtual void ReturnException(const char* msg) = 0;
+
+  /*! * \brief sends a packed argument sequnce to the client. */
+  virtual void ReturnPackedSeq(const TVMValue* arg_values, const int* type_codes, int num_args) = 0;
+
+  /*! * \brief sends a copy of the requested remote data to the client. */
+  virtual void ReturnCopyFromRemote(uint8_t* data_ptr, uint64_t num_bytes) = 0;
+
+  /*! * \brief sends an exception response to the client with the last TVM erros as the message. */
+  virtual void ReturnLastTVMError() = 0;
+
+  /*! * \brief internal error. */
+  virtual void ThrowError(RPCServerStatus code, RPCCode info = RPCCode::kNone) = 0;
+};
+
+/*!
+ * \brief Execute interface used in MinRPCServer to process different received commands
+ */
+class MinRPCExecInterface {
+ public:
+  virtual ~MinRPCExecInterface() {}
+
+  /*! * \brief Execute an Initilize server command. */
+  virtual void InitServer(int num_args) = 0;
+
+  /*! * \brief calls a function specified by the call_handle. */
+  virtual void NormalCallFunc(uint64_t call_handle, TVMValue* values, int* tcodes,
+                              int num_args) = 0;
+
+  /*! * \brief Execute a copy from remote command by sending the data described in arr to the client
+   */
+  virtual void CopyFromRemote(DLTensor* arr, uint64_t num_bytes, uint8_t* data_ptr) = 0;
+
+  /*! * \brief Execute a copy to remote command by receiving the data described in arr from the
+   * client */
+  virtual int CopyToRemote(DLTensor* arr, uint64_t num_bytes, uint8_t* data_ptr) = 0;
+
+  /*! * \brief calls a system function specified by the code. */
+  virtual void SysCallFunc(RPCCode code, TVMValue* values, int* tcodes, int num_args) = 0;
+
+  /*! * \brief internal error. */
+  virtual void ThrowError(RPCServerStatus code, RPCCode info = RPCCode::kNone) = 0;
+
+  /*! * \brief return the ReturnInterface pointer that is used to generate and send the responses.
+   */
+  virtual MinRPCReturnInterface* GetReturnInterface() = 0;
+};
+
+}  // namespace runtime
+}  // namespace tvm
+#endif  // TVM_RUNTIME_MINRPC_MINRPC_INTERFACES_H_