tport.cc revision 3296
12914Ssaidi@eecs.umich.edu/* 22914Ssaidi@eecs.umich.edu * Copyright (c) 2006 The Regents of The University of Michigan 32914Ssaidi@eecs.umich.edu * All rights reserved. 42914Ssaidi@eecs.umich.edu * 52914Ssaidi@eecs.umich.edu * Redistribution and use in source and binary forms, with or without 62914Ssaidi@eecs.umich.edu * modification, are permitted provided that the following conditions are 72914Ssaidi@eecs.umich.edu * met: redistributions of source code must retain the above copyright 82914Ssaidi@eecs.umich.edu * notice, this list of conditions and the following disclaimer; 92914Ssaidi@eecs.umich.edu * redistributions in binary form must reproduce the above copyright 102914Ssaidi@eecs.umich.edu * notice, this list of conditions and the following disclaimer in the 112914Ssaidi@eecs.umich.edu * documentation and/or other materials provided with the distribution; 122914Ssaidi@eecs.umich.edu * neither the name of the copyright holders nor the names of its 132914Ssaidi@eecs.umich.edu * contributors may be used to endorse or promote products derived from 142914Ssaidi@eecs.umich.edu * this software without specific prior written permission. 152914Ssaidi@eecs.umich.edu * 162914Ssaidi@eecs.umich.edu * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 172914Ssaidi@eecs.umich.edu * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 182914Ssaidi@eecs.umich.edu * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 192914Ssaidi@eecs.umich.edu * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 202914Ssaidi@eecs.umich.edu * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 212914Ssaidi@eecs.umich.edu * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 222914Ssaidi@eecs.umich.edu * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 232914Ssaidi@eecs.umich.edu * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 242914Ssaidi@eecs.umich.edu * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 252914Ssaidi@eecs.umich.edu * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 262914Ssaidi@eecs.umich.edu * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 272914Ssaidi@eecs.umich.edu * 282914Ssaidi@eecs.umich.edu * Authors: Ali Saidi 292914Ssaidi@eecs.umich.edu */ 302914Ssaidi@eecs.umich.edu 312914Ssaidi@eecs.umich.edu#include "mem/tport.hh" 322914Ssaidi@eecs.umich.edu 332914Ssaidi@eecs.umich.eduvoid 343091Sstever@eecs.umich.eduSimpleTimingPort::recvFunctional(Packet *pkt) 353091Sstever@eecs.umich.edu{ 363284Srdreslin@umich.edu //First check queued events 373284Srdreslin@umich.edu std::list<Packet *>::iterator i = transmitList.begin(); 383284Srdreslin@umich.edu std::list<Packet *>::iterator end = transmitList.end(); 393296Ssaidi@eecs.umich.edu bool cont = true; 403296Ssaidi@eecs.umich.edu 413296Ssaidi@eecs.umich.edu while (i != end && cont) { 423284Srdreslin@umich.edu Packet * target = *i; 433284Srdreslin@umich.edu // If the target contains data, and it overlaps the 443284Srdreslin@umich.edu // probed request, need to update data 453296Ssaidi@eecs.umich.edu if (target->intersect(pkt)) 463296Ssaidi@eecs.umich.edu fixPacket(pkt, target); 473284Srdreslin@umich.edu 483284Srdreslin@umich.edu } 493284Srdreslin@umich.edu //Then just do an atomic access and throw away the returned latency 503296Ssaidi@eecs.umich.edu if (cont) 513296Ssaidi@eecs.umich.edu recvAtomic(pkt); 523091Sstever@eecs.umich.edu} 533091Sstever@eecs.umich.edu 543091Sstever@eecs.umich.edubool 553091Sstever@eecs.umich.eduSimpleTimingPort::recvTiming(Packet *pkt) 563091Sstever@eecs.umich.edu{ 573091Sstever@eecs.umich.edu // If the device is only a slave, it should only be sending 583091Sstever@eecs.umich.edu // responses, which should never get nacked. There used to be 593091Sstever@eecs.umich.edu // code to hanldle nacks here, but I'm pretty sure it didn't work 603091Sstever@eecs.umich.edu // correctly with the drain code, so that would need to be fixed 613091Sstever@eecs.umich.edu // if we ever added it back. 623091Sstever@eecs.umich.edu assert(pkt->result != Packet::Nacked); 633091Sstever@eecs.umich.edu Tick latency = recvAtomic(pkt); 643175Srdreslin@umich.edu // turn packet around to go back to requester if response expected 653175Srdreslin@umich.edu if (pkt->needsResponse()) { 663175Srdreslin@umich.edu pkt->makeTimingResponse(); 673175Srdreslin@umich.edu sendTimingLater(pkt, latency); 683175Srdreslin@umich.edu } 693091Sstever@eecs.umich.edu return true; 703091Sstever@eecs.umich.edu} 713091Sstever@eecs.umich.edu 723091Sstever@eecs.umich.eduvoid 732914Ssaidi@eecs.umich.eduSimpleTimingPort::recvRetry() 742914Ssaidi@eecs.umich.edu{ 753263Srdreslin@umich.edu assert(outTiming > 0); 763263Srdreslin@umich.edu assert(!transmitList.empty()); 773263Srdreslin@umich.edu if (sendTiming(transmitList.front())) { 783263Srdreslin@umich.edu transmitList.pop_front(); 793263Srdreslin@umich.edu outTiming--; 803263Srdreslin@umich.edu DPRINTF(Bus, "No Longer waiting on retry\n"); 813263Srdreslin@umich.edu if (!transmitList.empty()) 823263Srdreslin@umich.edu sendTimingLater(transmitList.front(), 1); 833263Srdreslin@umich.edu } 843219Sgblack@eecs.umich.edu 853263Srdreslin@umich.edu if (transmitList.empty() && drainEvent) { 863091Sstever@eecs.umich.edu drainEvent->process(); 873091Sstever@eecs.umich.edu drainEvent = NULL; 883091Sstever@eecs.umich.edu } 892914Ssaidi@eecs.umich.edu} 902914Ssaidi@eecs.umich.edu 912914Ssaidi@eecs.umich.eduvoid 922914Ssaidi@eecs.umich.eduSimpleTimingPort::SendEvent::process() 932914Ssaidi@eecs.umich.edu{ 943263Srdreslin@umich.edu assert(port->outTiming > 0); 953263Srdreslin@umich.edu if (!port->transmitList.empty() && port->transmitList.front() != packet) { 963263Srdreslin@umich.edu //We are not the head of the list 973219Sgblack@eecs.umich.edu port->transmitList.push_back(packet); 983241Sgblack@eecs.umich.edu } else if (port->sendTiming(packet)) { 993219Sgblack@eecs.umich.edu // send successful 1003263Srdreslin@umich.edu if (port->transmitList.size()) { 1013263Srdreslin@umich.edu port->transmitList.pop_front(); 1023263Srdreslin@umich.edu port->outTiming--; 1033263Srdreslin@umich.edu if (!port->transmitList.empty()) 1043263Srdreslin@umich.edu port->sendTimingLater(port->transmitList.front(), 1); 1053263Srdreslin@umich.edu } 1063263Srdreslin@umich.edu if (port->transmitList.empty() && port->drainEvent) { 1073091Sstever@eecs.umich.edu port->drainEvent->process(); 1083091Sstever@eecs.umich.edu port->drainEvent = NULL; 1093091Sstever@eecs.umich.edu } 1103091Sstever@eecs.umich.edu } else { 1113091Sstever@eecs.umich.edu // send unsuccessful (due to flow control). Will get retry 1123263Srdreslin@umich.edu // callback later; save for then if not already 1133263Srdreslin@umich.edu DPRINTF(Bus, "Waiting on retry\n"); 1143263Srdreslin@umich.edu if (!(port->transmitList.front() == packet)) 1153263Srdreslin@umich.edu port->transmitList.push_back(packet); 1163091Sstever@eecs.umich.edu } 1172914Ssaidi@eecs.umich.edu} 1182914Ssaidi@eecs.umich.edu 1192914Ssaidi@eecs.umich.edu 1202914Ssaidi@eecs.umich.eduunsigned int 1212914Ssaidi@eecs.umich.eduSimpleTimingPort::drain(Event *de) 1222914Ssaidi@eecs.umich.edu{ 1232914Ssaidi@eecs.umich.edu if (outTiming == 0 && transmitList.size() == 0) 1242914Ssaidi@eecs.umich.edu return 0; 1252914Ssaidi@eecs.umich.edu drainEvent = de; 1262914Ssaidi@eecs.umich.edu return 1; 1272914Ssaidi@eecs.umich.edu} 128