OutputUnit.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/OutputUnit.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/Credit.hh" 3911666Stushar@ece.gatech.edu#include "mem/ruby/network/garnet2.0/Router.hh" 4011666Stushar@ece.gatech.edu 4111666Stushar@ece.gatech.eduusing namespace std; 4211666Stushar@ece.gatech.eduusing m5::stl_helpers::deletePointers; 4311666Stushar@ece.gatech.edu 4411666Stushar@ece.gatech.eduOutputUnit::OutputUnit(int id, PortDirection direction, Router *router) 4511666Stushar@ece.gatech.edu : Consumer(router) 4611666Stushar@ece.gatech.edu{ 4711666Stushar@ece.gatech.edu m_id = id; 4811666Stushar@ece.gatech.edu m_direction = direction; 4911666Stushar@ece.gatech.edu m_router = router; 5011666Stushar@ece.gatech.edu m_num_vcs = m_router->get_num_vcs(); 5111666Stushar@ece.gatech.edu m_vc_per_vnet = m_router->get_vc_per_vnet(); 5211666Stushar@ece.gatech.edu m_out_buffer = new flitBuffer(); 5311666Stushar@ece.gatech.edu 5411666Stushar@ece.gatech.edu for (int i = 0; i < m_num_vcs; i++) { 5511666Stushar@ece.gatech.edu m_outvc_state.push_back(new OutVcState(i, m_router->get_net_ptr())); 5611666Stushar@ece.gatech.edu } 5711666Stushar@ece.gatech.edu} 5811666Stushar@ece.gatech.edu 5911666Stushar@ece.gatech.eduOutputUnit::~OutputUnit() 6011666Stushar@ece.gatech.edu{ 6111666Stushar@ece.gatech.edu delete m_out_buffer; 6211666Stushar@ece.gatech.edu deletePointers(m_outvc_state); 6311666Stushar@ece.gatech.edu} 6411666Stushar@ece.gatech.edu 6511666Stushar@ece.gatech.eduvoid 6611666Stushar@ece.gatech.eduOutputUnit::decrement_credit(int out_vc) 6711666Stushar@ece.gatech.edu{ 6811666Stushar@ece.gatech.edu DPRINTF(RubyNetwork, "Router %d OutputUnit %d decrementing credit for " 6911666Stushar@ece.gatech.edu "outvc %d at time: %lld\n", 7011666Stushar@ece.gatech.edu m_router->get_id(), m_id, out_vc, m_router->curCycle()); 7111666Stushar@ece.gatech.edu 7211666Stushar@ece.gatech.edu m_outvc_state[out_vc]->decrement_credit(); 7311666Stushar@ece.gatech.edu} 7411666Stushar@ece.gatech.edu 7511666Stushar@ece.gatech.eduvoid 7611666Stushar@ece.gatech.eduOutputUnit::increment_credit(int out_vc) 7711666Stushar@ece.gatech.edu{ 7811666Stushar@ece.gatech.edu DPRINTF(RubyNetwork, "Router %d OutputUnit %d incrementing credit for " 7911666Stushar@ece.gatech.edu "outvc %d at time: %lld\n", 8011666Stushar@ece.gatech.edu m_router->get_id(), m_id, out_vc, m_router->curCycle()); 8111666Stushar@ece.gatech.edu 8211666Stushar@ece.gatech.edu m_outvc_state[out_vc]->increment_credit(); 8311666Stushar@ece.gatech.edu} 8411666Stushar@ece.gatech.edu 8511666Stushar@ece.gatech.edu// Check if the output VC (i.e., input VC at next router) 8611666Stushar@ece.gatech.edu// has free credits (i..e, buffer slots). 8711666Stushar@ece.gatech.edu// This is tracked by OutVcState 8811666Stushar@ece.gatech.edubool 8911666Stushar@ece.gatech.eduOutputUnit::has_credit(int out_vc) 9011666Stushar@ece.gatech.edu{ 9111666Stushar@ece.gatech.edu assert(m_outvc_state[out_vc]->isInState(ACTIVE_, m_router->curCycle())); 9211666Stushar@ece.gatech.edu return m_outvc_state[out_vc]->has_credit(); 9311666Stushar@ece.gatech.edu} 9411666Stushar@ece.gatech.edu 9511666Stushar@ece.gatech.edu 9611666Stushar@ece.gatech.edu// Check if the output port (i.e., input port at next router) has free VCs. 9711666Stushar@ece.gatech.edubool 9811666Stushar@ece.gatech.eduOutputUnit::has_free_vc(int vnet) 9911666Stushar@ece.gatech.edu{ 10011666Stushar@ece.gatech.edu int vc_base = vnet*m_vc_per_vnet; 10111666Stushar@ece.gatech.edu for (int vc = vc_base; vc < vc_base + m_vc_per_vnet; vc++) { 10211666Stushar@ece.gatech.edu if (is_vc_idle(vc, m_router->curCycle())) 10311666Stushar@ece.gatech.edu return true; 10411666Stushar@ece.gatech.edu } 10511666Stushar@ece.gatech.edu 10611666Stushar@ece.gatech.edu return false; 10711666Stushar@ece.gatech.edu} 10811666Stushar@ece.gatech.edu 10911666Stushar@ece.gatech.edu// Assign a free output VC to the winner of Switch Allocation 11011666Stushar@ece.gatech.eduint 11111666Stushar@ece.gatech.eduOutputUnit::select_free_vc(int vnet) 11211666Stushar@ece.gatech.edu{ 11311666Stushar@ece.gatech.edu int vc_base = vnet*m_vc_per_vnet; 11411666Stushar@ece.gatech.edu for (int vc = vc_base; vc < vc_base + m_vc_per_vnet; vc++) { 11511666Stushar@ece.gatech.edu if (is_vc_idle(vc, m_router->curCycle())) { 11611666Stushar@ece.gatech.edu m_outvc_state[vc]->setState(ACTIVE_, m_router->curCycle()); 11711666Stushar@ece.gatech.edu return vc; 11811666Stushar@ece.gatech.edu } 11911666Stushar@ece.gatech.edu } 12011666Stushar@ece.gatech.edu 12111666Stushar@ece.gatech.edu return -1; 12211666Stushar@ece.gatech.edu} 12311666Stushar@ece.gatech.edu 12411666Stushar@ece.gatech.edu/* 12511666Stushar@ece.gatech.edu * The wakeup function of the OutputUnit reads the credit signal from the 12611666Stushar@ece.gatech.edu * downstream router for the output VC (i.e., input VC at downstream router). 12711666Stushar@ece.gatech.edu * It increments the credit count in the appropriate output VC state. 12811666Stushar@ece.gatech.edu * If the credit carries is_free_signal as true, 12911666Stushar@ece.gatech.edu * the output VC is marked IDLE. 13011666Stushar@ece.gatech.edu */ 13111666Stushar@ece.gatech.edu 13211666Stushar@ece.gatech.eduvoid 13311666Stushar@ece.gatech.eduOutputUnit::wakeup() 13411666Stushar@ece.gatech.edu{ 13511666Stushar@ece.gatech.edu if (m_credit_link->isReady(m_router->curCycle())) { 13611666Stushar@ece.gatech.edu Credit *t_credit = (Credit*) m_credit_link->consumeLink(); 13711666Stushar@ece.gatech.edu increment_credit(t_credit->get_vc()); 13811666Stushar@ece.gatech.edu 13911666Stushar@ece.gatech.edu if (t_credit->is_free_signal()) 14011666Stushar@ece.gatech.edu set_vc_state(IDLE_, t_credit->get_vc(), m_router->curCycle()); 14111666Stushar@ece.gatech.edu 14211666Stushar@ece.gatech.edu delete t_credit; 14311666Stushar@ece.gatech.edu } 14411666Stushar@ece.gatech.edu} 14511666Stushar@ece.gatech.edu 14611666Stushar@ece.gatech.eduflitBuffer* 14711666Stushar@ece.gatech.eduOutputUnit::getOutQueue() 14811666Stushar@ece.gatech.edu{ 14911666Stushar@ece.gatech.edu return m_out_buffer; 15011666Stushar@ece.gatech.edu} 15111666Stushar@ece.gatech.edu 15211666Stushar@ece.gatech.eduvoid 15311666Stushar@ece.gatech.eduOutputUnit::set_out_link(NetworkLink *link) 15411666Stushar@ece.gatech.edu{ 15511666Stushar@ece.gatech.edu m_out_link = link; 15611666Stushar@ece.gatech.edu} 15711666Stushar@ece.gatech.edu 15811666Stushar@ece.gatech.eduvoid 15911666Stushar@ece.gatech.eduOutputUnit::set_credit_link(CreditLink *credit_link) 16011666Stushar@ece.gatech.edu{ 16111666Stushar@ece.gatech.edu m_credit_link = credit_link; 16211666Stushar@ece.gatech.edu} 16311666Stushar@ece.gatech.edu 16411666Stushar@ece.gatech.eduuint32_t 16511666Stushar@ece.gatech.eduOutputUnit::functionalWrite(Packet *pkt) 16611666Stushar@ece.gatech.edu{ 16711666Stushar@ece.gatech.edu return m_out_buffer->functionalWrite(pkt); 16811666Stushar@ece.gatech.edu} 169