CrossbarSwitch.cc revision 11666
111666Stushar@ece.gatech.edu/* 211666Stushar@ece.gatech.edu * Copyright (c) 2008 Princeton University 311666Stushar@ece.gatech.edu * Copyright (c) 2016 Georgia Institute of Technology 411666Stushar@ece.gatech.edu * All rights reserved. 511666Stushar@ece.gatech.edu * 611666Stushar@ece.gatech.edu * Redistribution and use in source and binary forms, with or without 711666Stushar@ece.gatech.edu * modification, are permitted provided that the following conditions are 811666Stushar@ece.gatech.edu * met: redistributions of source code must retain the above copyright 911666Stushar@ece.gatech.edu * notice, this list of conditions and the following disclaimer; 1011666Stushar@ece.gatech.edu * redistributions in binary form must reproduce the above copyright 1111666Stushar@ece.gatech.edu * notice, this list of conditions and the following disclaimer in the 1211666Stushar@ece.gatech.edu * documentation and/or other materials provided with the distribution; 1311666Stushar@ece.gatech.edu * neither the name of the copyright holders nor the names of its 1411666Stushar@ece.gatech.edu * contributors may be used to endorse or promote products derived from 1511666Stushar@ece.gatech.edu * this software without specific prior written permission. 1611666Stushar@ece.gatech.edu * 1711666Stushar@ece.gatech.edu * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 1811666Stushar@ece.gatech.edu * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 1911666Stushar@ece.gatech.edu * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 2011666Stushar@ece.gatech.edu * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 2111666Stushar@ece.gatech.edu * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 2211666Stushar@ece.gatech.edu * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 2311666Stushar@ece.gatech.edu * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 2411666Stushar@ece.gatech.edu * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 2511666Stushar@ece.gatech.edu * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 2611666Stushar@ece.gatech.edu * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 2711666Stushar@ece.gatech.edu * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 2811666Stushar@ece.gatech.edu * 2911666Stushar@ece.gatech.edu * Authors: Niket Agarwal 3011666Stushar@ece.gatech.edu * Tushar Krishna 3111666Stushar@ece.gatech.edu */ 3211666Stushar@ece.gatech.edu 3311666Stushar@ece.gatech.edu 3411666Stushar@ece.gatech.edu#include "mem/ruby/network/garnet2.0/CrossbarSwitch.hh" 3511666Stushar@ece.gatech.edu 3611666Stushar@ece.gatech.edu#include "base/stl_helpers.hh" 3711666Stushar@ece.gatech.edu#include "debug/RubyNetwork.hh" 3811666Stushar@ece.gatech.edu#include "mem/ruby/network/garnet2.0/OutputUnit.hh" 3911666Stushar@ece.gatech.edu#include "mem/ruby/network/garnet2.0/Router.hh" 4011666Stushar@ece.gatech.edu 4111666Stushar@ece.gatech.eduusing m5::stl_helpers::deletePointers; 4211666Stushar@ece.gatech.edu 4311666Stushar@ece.gatech.eduCrossbarSwitch::CrossbarSwitch(Router *router) 4411666Stushar@ece.gatech.edu : Consumer(router) 4511666Stushar@ece.gatech.edu{ 4611666Stushar@ece.gatech.edu m_router = router; 4711666Stushar@ece.gatech.edu m_num_vcs = m_router->get_num_vcs(); 4811666Stushar@ece.gatech.edu m_crossbar_activity = 0; 4911666Stushar@ece.gatech.edu} 5011666Stushar@ece.gatech.edu 5111666Stushar@ece.gatech.eduCrossbarSwitch::~CrossbarSwitch() 5211666Stushar@ece.gatech.edu{ 5311666Stushar@ece.gatech.edu deletePointers(m_switch_buffer); 5411666Stushar@ece.gatech.edu} 5511666Stushar@ece.gatech.edu 5611666Stushar@ece.gatech.eduvoid 5711666Stushar@ece.gatech.eduCrossbarSwitch::init() 5811666Stushar@ece.gatech.edu{ 5911666Stushar@ece.gatech.edu m_output_unit = m_router->get_outputUnit_ref(); 6011666Stushar@ece.gatech.edu 6111666Stushar@ece.gatech.edu m_num_inports = m_router->get_num_inports(); 6211666Stushar@ece.gatech.edu m_switch_buffer.resize(m_num_inports); 6311666Stushar@ece.gatech.edu for (int i = 0; i < m_num_inports; i++) { 6411666Stushar@ece.gatech.edu m_switch_buffer[i] = new flitBuffer(); 6511666Stushar@ece.gatech.edu } 6611666Stushar@ece.gatech.edu} 6711666Stushar@ece.gatech.edu 6811666Stushar@ece.gatech.edu/* 6911666Stushar@ece.gatech.edu * The wakeup function of the CrossbarSwitch loops through all input ports, 7011666Stushar@ece.gatech.edu * and sends the winning flit (from SA) out of its output port on to the 7111666Stushar@ece.gatech.edu * output link. The output link is scheduled for wakeup in the next cycle. 7211666Stushar@ece.gatech.edu */ 7311666Stushar@ece.gatech.edu 7411666Stushar@ece.gatech.eduvoid 7511666Stushar@ece.gatech.eduCrossbarSwitch::wakeup() 7611666Stushar@ece.gatech.edu{ 7711666Stushar@ece.gatech.edu DPRINTF(RubyNetwork, "CrossbarSwitch at Router %d woke up " 7811666Stushar@ece.gatech.edu "at time: %lld\n", 7911666Stushar@ece.gatech.edu m_router->get_id(), m_router->curCycle()); 8011666Stushar@ece.gatech.edu 8111666Stushar@ece.gatech.edu for (int inport = 0; inport < m_num_inports; inport++) { 8211666Stushar@ece.gatech.edu if (!m_switch_buffer[inport]->isReady(m_router->curCycle())) 8311666Stushar@ece.gatech.edu continue; 8411666Stushar@ece.gatech.edu 8511666Stushar@ece.gatech.edu flit *t_flit = m_switch_buffer[inport]->peekTopFlit(); 8611666Stushar@ece.gatech.edu if (t_flit->is_stage(ST_, m_router->curCycle())) { 8711666Stushar@ece.gatech.edu int outport = t_flit->get_outport(); 8811666Stushar@ece.gatech.edu 8911666Stushar@ece.gatech.edu // flit performs LT_ in the next cycle 9011666Stushar@ece.gatech.edu t_flit->advance_stage(LT_, m_router->curCycle() + Cycles(1)); 9111666Stushar@ece.gatech.edu t_flit->set_time(m_router->curCycle() + Cycles(1)); 9211666Stushar@ece.gatech.edu 9311666Stushar@ece.gatech.edu // This will take care of waking up the Network Link 9411666Stushar@ece.gatech.edu // in the next cycle 9511666Stushar@ece.gatech.edu m_output_unit[outport]->insert_flit(t_flit); 9611666Stushar@ece.gatech.edu m_switch_buffer[inport]->getTopFlit(); 9711666Stushar@ece.gatech.edu m_crossbar_activity++; 9811666Stushar@ece.gatech.edu } 9911666Stushar@ece.gatech.edu } 10011666Stushar@ece.gatech.edu} 10111666Stushar@ece.gatech.edu 10211666Stushar@ece.gatech.eduuint32_t 10311666Stushar@ece.gatech.eduCrossbarSwitch::functionalWrite(Packet *pkt) 10411666Stushar@ece.gatech.edu{ 10511666Stushar@ece.gatech.edu uint32_t num_functional_writes = 0; 10611666Stushar@ece.gatech.edu 10711666Stushar@ece.gatech.edu for (uint32_t i = 0; i < m_switch_buffer.size(); ++i) { 10811666Stushar@ece.gatech.edu num_functional_writes += m_switch_buffer[i]->functionalWrite(pkt); 10911666Stushar@ece.gatech.edu } 11011666Stushar@ece.gatech.edu 11111666Stushar@ece.gatech.edu return num_functional_writes; 11211666Stushar@ece.gatech.edu} 113