tport.cc revision 5740
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 335740Snate@binkert.orgusing namespace std; 345740Snate@binkert.org 355740Snate@binkert.orgSimpleTimingPort::SimpleTimingPort(string pname, MemObject *_owner) 365740Snate@binkert.org : Port(pname, _owner), sendEvent(0), drainEvent(NULL), 375740Snate@binkert.org waitingOnRetry(false) 385740Snate@binkert.org{ 395740Snate@binkert.org sendEvent = new EventWrapper<SimpleTimingPort, 405740Snate@binkert.org &SimpleTimingPort::processSendEvent>(this); 415740Snate@binkert.org} 425740Snate@binkert.org 435740Snate@binkert.orgSimpleTimingPort::~SimpleTimingPort() 445740Snate@binkert.org{ 455740Snate@binkert.org delete sendEvent; 465740Snate@binkert.org} 475740Snate@binkert.org 484929Sstever@gmail.combool 494490Sstever@eecs.umich.eduSimpleTimingPort::checkFunctional(PacketPtr pkt) 503091Sstever@eecs.umich.edu{ 514490Sstever@eecs.umich.edu DeferredPacketIterator i = transmitList.begin(); 524490Sstever@eecs.umich.edu DeferredPacketIterator end = transmitList.end(); 533296Ssaidi@eecs.umich.edu 544492Sstever@eecs.umich.edu for (; i != end; ++i) { 554490Sstever@eecs.umich.edu PacketPtr target = i->pkt; 563284Srdreslin@umich.edu // If the target contains data, and it overlaps the 573284Srdreslin@umich.edu // probed request, need to update data 584874Sstever@eecs.umich.edu if (pkt->checkFunctional(target)) { 594929Sstever@gmail.com return true; 604490Sstever@eecs.umich.edu } 613284Srdreslin@umich.edu } 624929Sstever@gmail.com 634929Sstever@gmail.com return false; 644490Sstever@eecs.umich.edu} 653342Srdreslin@umich.edu 664490Sstever@eecs.umich.eduvoid 674490Sstever@eecs.umich.eduSimpleTimingPort::recvFunctional(PacketPtr pkt) 684490Sstever@eecs.umich.edu{ 694929Sstever@gmail.com if (!checkFunctional(pkt)) { 704929Sstever@gmail.com // Just do an atomic access and throw away the returned latency 713296Ssaidi@eecs.umich.edu recvAtomic(pkt); 724929Sstever@gmail.com } 733091Sstever@eecs.umich.edu} 743091Sstever@eecs.umich.edu 753091Sstever@eecs.umich.edubool 763349Sbinkertn@umich.eduSimpleTimingPort::recvTiming(PacketPtr pkt) 773091Sstever@eecs.umich.edu{ 783091Sstever@eecs.umich.edu // If the device is only a slave, it should only be sending 793091Sstever@eecs.umich.edu // responses, which should never get nacked. There used to be 803091Sstever@eecs.umich.edu // code to hanldle nacks here, but I'm pretty sure it didn't work 813091Sstever@eecs.umich.edu // correctly with the drain code, so that would need to be fixed 823091Sstever@eecs.umich.edu // if we ever added it back. 834670Sstever@eecs.umich.edu 844670Sstever@eecs.umich.edu if (pkt->memInhibitAsserted()) { 854670Sstever@eecs.umich.edu // snooper will supply based on copy of packet 864670Sstever@eecs.umich.edu // still target's responsibility to delete packet 874670Sstever@eecs.umich.edu delete pkt; 884670Sstever@eecs.umich.edu return true; 894670Sstever@eecs.umich.edu } 904670Sstever@eecs.umich.edu 914626Sstever@eecs.umich.edu bool needsResponse = pkt->needsResponse(); 923091Sstever@eecs.umich.edu Tick latency = recvAtomic(pkt); 933175Srdreslin@umich.edu // turn packet around to go back to requester if response expected 944626Sstever@eecs.umich.edu if (needsResponse) { 954670Sstever@eecs.umich.edu // recvAtomic() should already have turned packet into 964670Sstever@eecs.umich.edu // atomic response 974626Sstever@eecs.umich.edu assert(pkt->isResponse()); 984493Sstever@eecs.umich.edu schedSendTiming(pkt, curTick + latency); 994626Sstever@eecs.umich.edu } else { 1004490Sstever@eecs.umich.edu delete pkt; 1013309Srdreslin@umich.edu } 1024670Sstever@eecs.umich.edu 1033091Sstever@eecs.umich.edu return true; 1043091Sstever@eecs.umich.edu} 1053091Sstever@eecs.umich.edu 1062914Ssaidi@eecs.umich.edu 1072914Ssaidi@eecs.umich.eduvoid 1084492Sstever@eecs.umich.eduSimpleTimingPort::schedSendTiming(PacketPtr pkt, Tick when) 1093403Ssaidi@eecs.umich.edu{ 1104492Sstever@eecs.umich.edu assert(when > curTick); 1114970Ssaidi@eecs.umich.edu assert(when < curTick + Clock::Int::ms); 1124492Sstever@eecs.umich.edu 1133450Ssaidi@eecs.umich.edu // Nothing is on the list: add it and schedule an event 1144666Sstever@eecs.umich.edu if (transmitList.empty() || when < transmitList.front().tick) { 1154666Sstever@eecs.umich.edu transmitList.push_front(DeferredPacket(when, pkt)); 1164666Sstever@eecs.umich.edu schedSendEvent(when); 1174666Sstever@eecs.umich.edu return; 1184666Sstever@eecs.umich.edu } 1194666Sstever@eecs.umich.edu 1204666Sstever@eecs.umich.edu // list is non-empty & this belongs at the end 1214666Sstever@eecs.umich.edu if (when >= transmitList.back().tick) { 1224492Sstever@eecs.umich.edu transmitList.push_back(DeferredPacket(when, pkt)); 1233450Ssaidi@eecs.umich.edu return; 1243403Ssaidi@eecs.umich.edu } 1253450Ssaidi@eecs.umich.edu 1264666Sstever@eecs.umich.edu // this belongs in the middle somewhere 1274490Sstever@eecs.umich.edu DeferredPacketIterator i = transmitList.begin(); 1284666Sstever@eecs.umich.edu i++; // already checked for insertion at front 1294490Sstever@eecs.umich.edu DeferredPacketIterator end = transmitList.end(); 1303450Ssaidi@eecs.umich.edu 1314492Sstever@eecs.umich.edu for (; i != end; ++i) { 1324492Sstever@eecs.umich.edu if (when < i->tick) { 1334492Sstever@eecs.umich.edu transmitList.insert(i, DeferredPacket(when, pkt)); 1344492Sstever@eecs.umich.edu return; 1353610Srdreslin@umich.edu } 1363450Ssaidi@eecs.umich.edu } 1374492Sstever@eecs.umich.edu assert(false); // should never get here 1383403Ssaidi@eecs.umich.edu} 1393403Ssaidi@eecs.umich.edu 1404492Sstever@eecs.umich.edu 1413403Ssaidi@eecs.umich.eduvoid 1424492Sstever@eecs.umich.eduSimpleTimingPort::sendDeferredPacket() 1432914Ssaidi@eecs.umich.edu{ 1444492Sstever@eecs.umich.edu assert(deferredPacketReady()); 1454870Sstever@eecs.umich.edu // take packet off list here; if recvTiming() on the other side 1464870Sstever@eecs.umich.edu // calls sendTiming() back on us (like SimpleTimingCpu does), then 1474870Sstever@eecs.umich.edu // we get confused by having a non-active packet on transmitList 1484870Sstever@eecs.umich.edu DeferredPacket dp = transmitList.front(); 1494870Sstever@eecs.umich.edu transmitList.pop_front(); 1504870Sstever@eecs.umich.edu bool success = sendTiming(dp.pkt); 1514492Sstever@eecs.umich.edu 1524492Sstever@eecs.umich.edu if (success) { 1534870Sstever@eecs.umich.edu if (!transmitList.empty() && !sendEvent->scheduled()) { 1544490Sstever@eecs.umich.edu Tick time = transmitList.front().tick; 1555606Snate@binkert.org schedule(sendEvent, time <= curTick ? curTick+1 : time); 1563263Srdreslin@umich.edu } 1574492Sstever@eecs.umich.edu 1584490Sstever@eecs.umich.edu if (transmitList.empty() && drainEvent) { 1594490Sstever@eecs.umich.edu drainEvent->process(); 1604490Sstever@eecs.umich.edu drainEvent = NULL; 1613091Sstever@eecs.umich.edu } 1624870Sstever@eecs.umich.edu } else { 1634870Sstever@eecs.umich.edu // Unsuccessful, need to put back on transmitList. Callee 1644870Sstever@eecs.umich.edu // should not have messed with it (since it didn't accept that 1654870Sstever@eecs.umich.edu // packet), so we can just push it back on the front. 1664870Sstever@eecs.umich.edu assert(!sendEvent->scheduled()); 1674870Sstever@eecs.umich.edu transmitList.push_front(dp); 1683091Sstever@eecs.umich.edu } 1694492Sstever@eecs.umich.edu 1704492Sstever@eecs.umich.edu waitingOnRetry = !success; 1714492Sstever@eecs.umich.edu 1724492Sstever@eecs.umich.edu if (waitingOnRetry) { 1734492Sstever@eecs.umich.edu DPRINTF(Bus, "Send failed, waiting on retry\n"); 1744492Sstever@eecs.umich.edu } 1754492Sstever@eecs.umich.edu} 1764492Sstever@eecs.umich.edu 1774492Sstever@eecs.umich.edu 1784492Sstever@eecs.umich.eduvoid 1794492Sstever@eecs.umich.eduSimpleTimingPort::recvRetry() 1804492Sstever@eecs.umich.edu{ 1814492Sstever@eecs.umich.edu DPRINTF(Bus, "Received retry\n"); 1824492Sstever@eecs.umich.edu assert(waitingOnRetry); 1834492Sstever@eecs.umich.edu sendDeferredPacket(); 1844492Sstever@eecs.umich.edu} 1854492Sstever@eecs.umich.edu 1864492Sstever@eecs.umich.edu 1874492Sstever@eecs.umich.eduvoid 1884492Sstever@eecs.umich.eduSimpleTimingPort::processSendEvent() 1894492Sstever@eecs.umich.edu{ 1904492Sstever@eecs.umich.edu assert(!waitingOnRetry); 1914492Sstever@eecs.umich.edu sendDeferredPacket(); 1922914Ssaidi@eecs.umich.edu} 1932914Ssaidi@eecs.umich.edu 1942914Ssaidi@eecs.umich.edu 1952914Ssaidi@eecs.umich.eduunsigned int 1962914Ssaidi@eecs.umich.eduSimpleTimingPort::drain(Event *de) 1972914Ssaidi@eecs.umich.edu{ 1983403Ssaidi@eecs.umich.edu if (transmitList.size() == 0) 1992914Ssaidi@eecs.umich.edu return 0; 2002914Ssaidi@eecs.umich.edu drainEvent = de; 2012914Ssaidi@eecs.umich.edu return 1; 2022914Ssaidi@eecs.umich.edu} 203