CrossbarSwitch.cc revision 11666
13536Sgblack@eecs.umich.edu/* 23536Sgblack@eecs.umich.edu * Copyright (c) 2008 Princeton University 33536Sgblack@eecs.umich.edu * Copyright (c) 2016 Georgia Institute of Technology 43536Sgblack@eecs.umich.edu * All rights reserved. 53536Sgblack@eecs.umich.edu * 63536Sgblack@eecs.umich.edu * Redistribution and use in source and binary forms, with or without 73536Sgblack@eecs.umich.edu * modification, are permitted provided that the following conditions are 83536Sgblack@eecs.umich.edu * met: redistributions of source code must retain the above copyright 93536Sgblack@eecs.umich.edu * notice, this list of conditions and the following disclaimer; 103536Sgblack@eecs.umich.edu * redistributions in binary form must reproduce the above copyright 113536Sgblack@eecs.umich.edu * notice, this list of conditions and the following disclaimer in the 123536Sgblack@eecs.umich.edu * documentation and/or other materials provided with the distribution; 133536Sgblack@eecs.umich.edu * neither the name of the copyright holders nor the names of its 143536Sgblack@eecs.umich.edu * contributors may be used to endorse or promote products derived from 153536Sgblack@eecs.umich.edu * this software without specific prior written permission. 163536Sgblack@eecs.umich.edu * 173536Sgblack@eecs.umich.edu * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 183536Sgblack@eecs.umich.edu * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 193536Sgblack@eecs.umich.edu * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 203536Sgblack@eecs.umich.edu * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 213536Sgblack@eecs.umich.edu * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 223536Sgblack@eecs.umich.edu * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 233536Sgblack@eecs.umich.edu * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 243536Sgblack@eecs.umich.edu * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 253536Sgblack@eecs.umich.edu * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 263536Sgblack@eecs.umich.edu * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 273536Sgblack@eecs.umich.edu * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 283536Sgblack@eecs.umich.edu * 293536Sgblack@eecs.umich.edu * Authors: Niket Agarwal 303536Sgblack@eecs.umich.edu * Tushar Krishna 313536Sgblack@eecs.umich.edu */ 323536Sgblack@eecs.umich.edu 333536Sgblack@eecs.umich.edu 343536Sgblack@eecs.umich.edu#include "mem/ruby/network/garnet2.0/CrossbarSwitch.hh" 353536Sgblack@eecs.umich.edu 363536Sgblack@eecs.umich.edu#include "base/stl_helpers.hh" 373536Sgblack@eecs.umich.edu#include "debug/RubyNetwork.hh" 383536Sgblack@eecs.umich.edu#include "mem/ruby/network/garnet2.0/OutputUnit.hh" 393536Sgblack@eecs.umich.edu#include "mem/ruby/network/garnet2.0/Router.hh" 403536Sgblack@eecs.umich.edu 413536Sgblack@eecs.umich.eduusing m5::stl_helpers::deletePointers; 423536Sgblack@eecs.umich.edu 433536Sgblack@eecs.umich.eduCrossbarSwitch::CrossbarSwitch(Router *router) 443536Sgblack@eecs.umich.edu : Consumer(router) 453536Sgblack@eecs.umich.edu{ 463536Sgblack@eecs.umich.edu m_router = router; 473536Sgblack@eecs.umich.edu m_num_vcs = m_router->get_num_vcs(); 483536Sgblack@eecs.umich.edu m_crossbar_activity = 0; 493536Sgblack@eecs.umich.edu} 503536Sgblack@eecs.umich.edu 513536Sgblack@eecs.umich.eduCrossbarSwitch::~CrossbarSwitch() 523536Sgblack@eecs.umich.edu{ 533536Sgblack@eecs.umich.edu deletePointers(m_switch_buffer); 543536Sgblack@eecs.umich.edu} 553536Sgblack@eecs.umich.edu 563536Sgblack@eecs.umich.eduvoid 573536Sgblack@eecs.umich.eduCrossbarSwitch::init() 583536Sgblack@eecs.umich.edu{ 593536Sgblack@eecs.umich.edu m_output_unit = m_router->get_outputUnit_ref(); 603536Sgblack@eecs.umich.edu 613536Sgblack@eecs.umich.edu m_num_inports = m_router->get_num_inports(); 623536Sgblack@eecs.umich.edu m_switch_buffer.resize(m_num_inports); 633536Sgblack@eecs.umich.edu for (int i = 0; i < m_num_inports; i++) { 643536Sgblack@eecs.umich.edu m_switch_buffer[i] = new flitBuffer(); 653536Sgblack@eecs.umich.edu } 663536Sgblack@eecs.umich.edu} 673536Sgblack@eecs.umich.edu 683536Sgblack@eecs.umich.edu/* 693536Sgblack@eecs.umich.edu * The wakeup function of the CrossbarSwitch loops through all input ports, 703536Sgblack@eecs.umich.edu * and sends the winning flit (from SA) out of its output port on to the 713536Sgblack@eecs.umich.edu * output link. The output link is scheduled for wakeup in the next cycle. 723536Sgblack@eecs.umich.edu */ 733536Sgblack@eecs.umich.edu 743536Sgblack@eecs.umich.eduvoid 753536Sgblack@eecs.umich.eduCrossbarSwitch::wakeup() 763536Sgblack@eecs.umich.edu{ 773536Sgblack@eecs.umich.edu DPRINTF(RubyNetwork, "CrossbarSwitch at Router %d woke up " 783536Sgblack@eecs.umich.edu "at time: %lld\n", 793536Sgblack@eecs.umich.edu m_router->get_id(), m_router->curCycle()); 803536Sgblack@eecs.umich.edu 813536Sgblack@eecs.umich.edu for (int inport = 0; inport < m_num_inports; inport++) { 823536Sgblack@eecs.umich.edu if (!m_switch_buffer[inport]->isReady(m_router->curCycle())) 833536Sgblack@eecs.umich.edu continue; 843536Sgblack@eecs.umich.edu 853536Sgblack@eecs.umich.edu flit *t_flit = m_switch_buffer[inport]->peekTopFlit(); 863536Sgblack@eecs.umich.edu if (t_flit->is_stage(ST_, m_router->curCycle())) { 873536Sgblack@eecs.umich.edu int outport = t_flit->get_outport(); 883536Sgblack@eecs.umich.edu 893536Sgblack@eecs.umich.edu // flit performs LT_ in the next cycle 903536Sgblack@eecs.umich.edu t_flit->advance_stage(LT_, m_router->curCycle() + Cycles(1)); 913536Sgblack@eecs.umich.edu t_flit->set_time(m_router->curCycle() + Cycles(1)); 923536Sgblack@eecs.umich.edu 933536Sgblack@eecs.umich.edu // This will take care of waking up the Network Link 943536Sgblack@eecs.umich.edu // in the next cycle 953536Sgblack@eecs.umich.edu m_output_unit[outport]->insert_flit(t_flit); 963536Sgblack@eecs.umich.edu m_switch_buffer[inport]->getTopFlit(); 973536Sgblack@eecs.umich.edu m_crossbar_activity++; 983536Sgblack@eecs.umich.edu } 993536Sgblack@eecs.umich.edu } 1003536Sgblack@eecs.umich.edu} 1013536Sgblack@eecs.umich.edu 1023536Sgblack@eecs.umich.eduuint32_t 1033536Sgblack@eecs.umich.eduCrossbarSwitch::functionalWrite(Packet *pkt) 1043536Sgblack@eecs.umich.edu{ 1053536Sgblack@eecs.umich.edu uint32_t num_functional_writes = 0; 1063536Sgblack@eecs.umich.edu 1073536Sgblack@eecs.umich.edu for (uint32_t i = 0; i < m_switch_buffer.size(); ++i) { 1083536Sgblack@eecs.umich.edu num_functional_writes += m_switch_buffer[i]->functionalWrite(pkt); 1093536Sgblack@eecs.umich.edu } 1103536Sgblack@eecs.umich.edu 1113536Sgblack@eecs.umich.edu return num_functional_writes; 1123536Sgblack@eecs.umich.edu} 1133536Sgblack@eecs.umich.edu