tport.cc revision 3450
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{ 363403Ssaidi@eecs.umich.edu std::list<std::pair<Tick,PacketPtr> >::iterator i = transmitList.begin(); 373403Ssaidi@eecs.umich.edu std::list<std::pair<Tick,PacketPtr> >::iterator end = transmitList.end(); 383403Ssaidi@eecs.umich.edu bool done = false; 393296Ssaidi@eecs.umich.edu 403403Ssaidi@eecs.umich.edu while (i != end && !done) { 413403Ssaidi@eecs.umich.edu PacketPtr target = i->second; 423284Srdreslin@umich.edu // If the target contains data, and it overlaps the 433284Srdreslin@umich.edu // probed request, need to update data 443296Ssaidi@eecs.umich.edu if (target->intersect(pkt)) 453403Ssaidi@eecs.umich.edu done = fixPacket(pkt, target); 463284Srdreslin@umich.edu 473450Ssaidi@eecs.umich.edu i++; 483284Srdreslin@umich.edu } 493342Srdreslin@umich.edu 503284Srdreslin@umich.edu //Then just do an atomic access and throw away the returned latency 513342Srdreslin@umich.edu if (pkt->result != Packet::Success) 523296Ssaidi@eecs.umich.edu recvAtomic(pkt); 533091Sstever@eecs.umich.edu} 543091Sstever@eecs.umich.edu 553091Sstever@eecs.umich.edubool 563349Sbinkertn@umich.eduSimpleTimingPort::recvTiming(PacketPtr pkt) 573091Sstever@eecs.umich.edu{ 583091Sstever@eecs.umich.edu // If the device is only a slave, it should only be sending 593091Sstever@eecs.umich.edu // responses, which should never get nacked. There used to be 603091Sstever@eecs.umich.edu // code to hanldle nacks here, but I'm pretty sure it didn't work 613091Sstever@eecs.umich.edu // correctly with the drain code, so that would need to be fixed 623091Sstever@eecs.umich.edu // if we ever added it back. 633091Sstever@eecs.umich.edu assert(pkt->result != Packet::Nacked); 643091Sstever@eecs.umich.edu Tick latency = recvAtomic(pkt); 653175Srdreslin@umich.edu // turn packet around to go back to requester if response expected 663175Srdreslin@umich.edu if (pkt->needsResponse()) { 673175Srdreslin@umich.edu pkt->makeTimingResponse(); 683403Ssaidi@eecs.umich.edu sendTiming(pkt, latency); 693175Srdreslin@umich.edu } 703309Srdreslin@umich.edu else { 713309Srdreslin@umich.edu if (pkt->cmd != Packet::UpgradeReq) 723309Srdreslin@umich.edu { 733309Srdreslin@umich.edu delete pkt->req; 743309Srdreslin@umich.edu delete pkt; 753309Srdreslin@umich.edu } 763309Srdreslin@umich.edu } 773091Sstever@eecs.umich.edu return true; 783091Sstever@eecs.umich.edu} 793091Sstever@eecs.umich.edu 803091Sstever@eecs.umich.eduvoid 812914Ssaidi@eecs.umich.eduSimpleTimingPort::recvRetry() 822914Ssaidi@eecs.umich.edu{ 833263Srdreslin@umich.edu assert(!transmitList.empty()); 843403Ssaidi@eecs.umich.edu if (Port::sendTiming(transmitList.front().second)) { 853263Srdreslin@umich.edu transmitList.pop_front(); 863263Srdreslin@umich.edu DPRINTF(Bus, "No Longer waiting on retry\n"); 873403Ssaidi@eecs.umich.edu if (!transmitList.empty()) { 883403Ssaidi@eecs.umich.edu Tick time = transmitList.front().first; 893403Ssaidi@eecs.umich.edu sendEvent.schedule(time <= curTick ? curTick+1 : time); 903403Ssaidi@eecs.umich.edu } 913263Srdreslin@umich.edu } 923219Sgblack@eecs.umich.edu 933263Srdreslin@umich.edu if (transmitList.empty() && drainEvent) { 943091Sstever@eecs.umich.edu drainEvent->process(); 953091Sstever@eecs.umich.edu drainEvent = NULL; 963091Sstever@eecs.umich.edu } 972914Ssaidi@eecs.umich.edu} 982914Ssaidi@eecs.umich.edu 992914Ssaidi@eecs.umich.eduvoid 1003403Ssaidi@eecs.umich.eduSimpleTimingPort::sendTiming(PacketPtr pkt, Tick time) 1013403Ssaidi@eecs.umich.edu{ 1023450Ssaidi@eecs.umich.edu // Nothing is on the list: add it and schedule an event 1033403Ssaidi@eecs.umich.edu if (transmitList.empty()) { 1043403Ssaidi@eecs.umich.edu assert(!sendEvent.scheduled()); 1053403Ssaidi@eecs.umich.edu sendEvent.schedule(curTick+time); 1063450Ssaidi@eecs.umich.edu transmitList.push_back(std::pair<Tick,PacketPtr>(time+curTick,pkt)); 1073450Ssaidi@eecs.umich.edu return; 1083403Ssaidi@eecs.umich.edu } 1093450Ssaidi@eecs.umich.edu 1103450Ssaidi@eecs.umich.edu // something is on the list and this belongs at the end 1113450Ssaidi@eecs.umich.edu if (time+curTick >= transmitList.back().first) { 1123450Ssaidi@eecs.umich.edu transmitList.push_back(std::pair<Tick,PacketPtr>(time+curTick,pkt)); 1133450Ssaidi@eecs.umich.edu return; 1143450Ssaidi@eecs.umich.edu } 1153450Ssaidi@eecs.umich.edu // Something is on the list and this belongs somewhere else 1163450Ssaidi@eecs.umich.edu std::list<std::pair<Tick,PacketPtr> >::iterator i = transmitList.begin(); 1173450Ssaidi@eecs.umich.edu std::list<std::pair<Tick,PacketPtr> >::iterator end = transmitList.end(); 1183450Ssaidi@eecs.umich.edu bool done = false; 1193450Ssaidi@eecs.umich.edu 1203450Ssaidi@eecs.umich.edu while (i != end && !done) { 1213450Ssaidi@eecs.umich.edu if (time+curTick < i->first) 1223450Ssaidi@eecs.umich.edu transmitList.insert(i,std::pair<Tick,PacketPtr>(time+curTick,pkt)); 1233450Ssaidi@eecs.umich.edu i++; 1243450Ssaidi@eecs.umich.edu } 1253403Ssaidi@eecs.umich.edu} 1263403Ssaidi@eecs.umich.edu 1273403Ssaidi@eecs.umich.eduvoid 1282914Ssaidi@eecs.umich.eduSimpleTimingPort::SendEvent::process() 1292914Ssaidi@eecs.umich.edu{ 1303403Ssaidi@eecs.umich.edu assert(port->transmitList.size()); 1313403Ssaidi@eecs.umich.edu assert(port->transmitList.front().first <= curTick); 1323403Ssaidi@eecs.umich.edu if (port->Port::sendTiming(port->transmitList.front().second)) { 1333403Ssaidi@eecs.umich.edu //send successful, remove packet 1343403Ssaidi@eecs.umich.edu port->transmitList.pop_front(); 1353403Ssaidi@eecs.umich.edu if (!port->transmitList.empty()) { 1363403Ssaidi@eecs.umich.edu Tick time = port->transmitList.front().first; 1373403Ssaidi@eecs.umich.edu schedule(time <= curTick ? curTick+1 : time); 1383263Srdreslin@umich.edu } 1393263Srdreslin@umich.edu if (port->transmitList.empty() && port->drainEvent) { 1403091Sstever@eecs.umich.edu port->drainEvent->process(); 1413091Sstever@eecs.umich.edu port->drainEvent = NULL; 1423091Sstever@eecs.umich.edu } 1433403Ssaidi@eecs.umich.edu return; 1443091Sstever@eecs.umich.edu } 1453403Ssaidi@eecs.umich.edu // send unsuccessful (due to flow control). Will get retry 1463403Ssaidi@eecs.umich.edu // callback later; save for then if not already 1473403Ssaidi@eecs.umich.edu DPRINTF(Bus, "Waiting on retry\n"); 1482914Ssaidi@eecs.umich.edu} 1492914Ssaidi@eecs.umich.edu 1502914Ssaidi@eecs.umich.edu 1512914Ssaidi@eecs.umich.eduunsigned int 1522914Ssaidi@eecs.umich.eduSimpleTimingPort::drain(Event *de) 1532914Ssaidi@eecs.umich.edu{ 1543403Ssaidi@eecs.umich.edu if (transmitList.size() == 0) 1552914Ssaidi@eecs.umich.edu return 0; 1562914Ssaidi@eecs.umich.edu drainEvent = de; 1572914Ssaidi@eecs.umich.edu return 1; 1582914Ssaidi@eecs.umich.edu} 159