tport.cc revision 3349
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
343349Sbinkertn@umich.eduSimpleTimingPort::recvFunctional(PacketPtr pkt)
353091Sstever@eecs.umich.edu{
363284Srdreslin@umich.edu    //First check queued events
373349Sbinkertn@umich.edu    std::list<PacketPtr>::iterator i = transmitList.begin();
383349Sbinkertn@umich.edu    std::list<PacketPtr>::iterator end = transmitList.end();
393296Ssaidi@eecs.umich.edu    bool cont = true;
403296Ssaidi@eecs.umich.edu
413296Ssaidi@eecs.umich.edu    while (i != end && cont) {
423349Sbinkertn@umich.edu        PacketPtr 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
553349Sbinkertn@umich.eduSimpleTimingPort::recvTiming(PacketPtr 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    }
693309Srdreslin@umich.edu    else {
703309Srdreslin@umich.edu        if (pkt->cmd != Packet::UpgradeReq)
713309Srdreslin@umich.edu        {
723309Srdreslin@umich.edu            delete pkt->req;
733309Srdreslin@umich.edu            delete pkt;
743309Srdreslin@umich.edu        }
753309Srdreslin@umich.edu    }
763091Sstever@eecs.umich.edu    return true;
773091Sstever@eecs.umich.edu}
783091Sstever@eecs.umich.edu
793091Sstever@eecs.umich.eduvoid
802914Ssaidi@eecs.umich.eduSimpleTimingPort::recvRetry()
812914Ssaidi@eecs.umich.edu{
823263Srdreslin@umich.edu    assert(outTiming > 0);
833263Srdreslin@umich.edu    assert(!transmitList.empty());
843263Srdreslin@umich.edu    if (sendTiming(transmitList.front())) {
853263Srdreslin@umich.edu        transmitList.pop_front();
863263Srdreslin@umich.edu        outTiming--;
873263Srdreslin@umich.edu        DPRINTF(Bus, "No Longer waiting on retry\n");
883263Srdreslin@umich.edu        if (!transmitList.empty())
893263Srdreslin@umich.edu            sendTimingLater(transmitList.front(), 1);
903263Srdreslin@umich.edu    }
913219Sgblack@eecs.umich.edu
923263Srdreslin@umich.edu    if (transmitList.empty() && drainEvent) {
933091Sstever@eecs.umich.edu        drainEvent->process();
943091Sstever@eecs.umich.edu        drainEvent = NULL;
953091Sstever@eecs.umich.edu    }
962914Ssaidi@eecs.umich.edu}
972914Ssaidi@eecs.umich.edu
982914Ssaidi@eecs.umich.eduvoid
992914Ssaidi@eecs.umich.eduSimpleTimingPort::SendEvent::process()
1002914Ssaidi@eecs.umich.edu{
1013263Srdreslin@umich.edu    assert(port->outTiming > 0);
1023263Srdreslin@umich.edu    if (!port->transmitList.empty() && port->transmitList.front() != packet) {
1033263Srdreslin@umich.edu        //We are not the head of the list
1043219Sgblack@eecs.umich.edu        port->transmitList.push_back(packet);
1053241Sgblack@eecs.umich.edu    } else if (port->sendTiming(packet)) {
1063219Sgblack@eecs.umich.edu        // send successful
1073263Srdreslin@umich.edu        if (port->transmitList.size()) {
1083263Srdreslin@umich.edu            port->transmitList.pop_front();
1093263Srdreslin@umich.edu            port->outTiming--;
1103263Srdreslin@umich.edu           if (!port->transmitList.empty())
1113263Srdreslin@umich.edu                port->sendTimingLater(port->transmitList.front(), 1);
1123263Srdreslin@umich.edu        }
1133263Srdreslin@umich.edu        if (port->transmitList.empty() && port->drainEvent) {
1143091Sstever@eecs.umich.edu            port->drainEvent->process();
1153091Sstever@eecs.umich.edu            port->drainEvent = NULL;
1163091Sstever@eecs.umich.edu        }
1173091Sstever@eecs.umich.edu    } else {
1183091Sstever@eecs.umich.edu        // send unsuccessful (due to flow control).  Will get retry
1193263Srdreslin@umich.edu        // callback later; save for then if not already
1203263Srdreslin@umich.edu        DPRINTF(Bus, "Waiting on retry\n");
1213263Srdreslin@umich.edu        if (!(port->transmitList.front() == packet))
1223263Srdreslin@umich.edu            port->transmitList.push_back(packet);
1233091Sstever@eecs.umich.edu    }
1242914Ssaidi@eecs.umich.edu}
1252914Ssaidi@eecs.umich.edu
1262914Ssaidi@eecs.umich.edu
1272914Ssaidi@eecs.umich.eduunsigned int
1282914Ssaidi@eecs.umich.eduSimpleTimingPort::drain(Event *de)
1292914Ssaidi@eecs.umich.edu{
1302914Ssaidi@eecs.umich.edu    if (outTiming == 0 && transmitList.size() == 0)
1312914Ssaidi@eecs.umich.edu        return 0;
1322914Ssaidi@eecs.umich.edu    drainEvent = de;
1332914Ssaidi@eecs.umich.edu    return 1;
1342914Ssaidi@eecs.umich.edu}
135