tqchen commented on a change in pull request #5484: URL: https://github.com/apache/incubator-tvm/pull/5484#discussion_r419684714
########## File path: src/runtime/rpc/minrpc/minrpc_server.h ########## @@ -0,0 +1,598 @@ +/* + * 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. + */ + +/*! + * \file minrpc_server.h + * \brief Minimum RPC server implementation, + * redirects all the calls to C runtime API. + * + * \note This file do not depend on c++ std or c std, + * and only depends on TVM's C runtime API. + */ +#ifndef TVM_RUNTIME_RPC_MINRPC_MINRPC_SERVER_H_ +#define TVM_RUNTIME_RPC_MINRPC_MINRPC_SERVER_H_ + +#include <dmlc/endian.h> +#include <tvm/runtime/c_runtime_api.h> +#include "../rpc_protocol.h" +#include "../../../support/arena.h" + +/*! \brief Whether or not to enable glog style DLOG */ +#ifndef TVM_MINRPC_ENABLE_LOGGING +#define TVM_MINRPC_ENABLE_LOGGING 0 +#endif + +#ifndef MINRPC_CHECK +#define MINRPC_CHECK(cond) \ + if (!(cond)) this->ThrowError(RPCServerStatus::kCheckError); +#endif + +#if TVM_MINRPC_ENABLE_LOGGING +#include <dmlc/logging.h> +#endif + + +namespace tvm { +namespace runtime { + +/*! + * \brief A minimum RPC server that only depends on the tvm C runtime.. + * + * All the dependencies are provided by the io arguments. + * + * \tparam TIOHandler IO provider to provide io handling. + * An IOHandler needs to provide the following functions: + * - PosixWrite, PosixRead, Close: posix style, read, write, close API. + * - Exit: exit with status code. + */ +template<typename TIOHandler> +class MinRPCServer { + public: + /*! + * \brief Constructor. + * \param io The IO handler. + */ + explicit MinRPCServer(TIOHandler io) + : io_(io), arena_(PageAllocator(io)) {} + + /*! \brief Run the server loop until shutdown signal is received. */ + void ServerLoop() { + RPCCode code; + uint64_t packet_len; + + while (true) { + arena_.RecycleAll(); + allow_clean_shutdown_ = true; + + this->Read(&packet_len); + if (packet_len == 0) continue; + this->Read(&code); + + allow_clean_shutdown_ = false; + + if (code >= RPCCode::kSyscallCodeStart) { + this->HandleSyscallFunc(code); + } else { + switch (code) { + case RPCCode::kCallFunc: { + HandleNormalCallFunc(); + break; + } + case RPCCode::kInitServer: { + HandleInitServer(); + break; + } + case RPCCode::kCopyFromRemote: { + HandleCopyFromRemote(); + break; + } + case RPCCode::kCopyToRemote: { + HandleCopyToRemote(); + break; + } + case RPCCode::kShutdown: { + this->Shutdown(); + return; + } + default: { + this->ThrowError(RPCServerStatus::kUnknownRPCCode); + break; + } + } + } + } + } + + void Shutdown() { + arena_.FreeAll(); + io_.Close(); + } + + void HandleNormalCallFunc() { + uint64_t call_handle; + TVMValue* values; + int* tcodes; + int num_args; + TVMValue ret_value[3]; + int ret_tcode[3]; + + this->Read(&call_handle); + RecvPackedSeq(&values, &tcodes, &num_args); + + int call_ecode = TVMFuncCall( + reinterpret_cast<void*>(call_handle), + values, tcodes, num_args, + &(ret_value[1]), &(ret_tcode[1])); + + if (call_ecode == 0) { + // Return value encoding as in LocalSession + int rv_tcode = ret_tcode[1]; + ret_tcode[0] = kDLInt; + ret_value[0].v_int64 = rv_tcode; + if (rv_tcode == kTVMNDArrayHandle) { + ret_tcode[1] = kTVMDLTensorHandle; + ret_value[2].v_handle = ret_value[1].v_handle; + ret_tcode[2] = kTVMOpaqueHandle; + this->ReturnPackedSeq(ret_value, ret_tcode, 3); + } else if (rv_tcode == kTVMPackedFuncHandle || + rv_tcode == kTVMModuleHandle) { + ret_tcode[1] = kTVMOpaqueHandle; + this->ReturnPackedSeq(ret_value, ret_tcode, 2); + } else { + this->ReturnPackedSeq(ret_value, ret_tcode, 2); + } + } else { + this->ReturnLastTVMError(); + } + } + + void HandleCopyFromRemote() { + uint64_t handle, offset, num_bytes; + TVMContext ctx; + DLDataType type_hint; + + this->Read(&handle); + this->Read(&offset); + this->Read(&num_bytes); + this->Read(&ctx); + this->Read(&type_hint); + + char* data_ptr; + int call_ecode = 0; + if (ctx.device_type == kDLCPU) { Review comment: The same code can be used to host a TVM runtime with GPU support ---------------------------------------------------------------- This is an automated message from the Apache Git Service. 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