tport.cc revision 4492:75dabb0392ee
15124Sgblack@eecs.umich.edu/* 27087Snate@binkert.org * Copyright (c) 2006 The Regents of The University of Michigan 37087Snate@binkert.org * All rights reserved. 47087Snate@binkert.org * 57087Snate@binkert.org * Redistribution and use in source and binary forms, with or without 67087Snate@binkert.org * modification, are permitted provided that the following conditions are 77087Snate@binkert.org * met: redistributions of source code must retain the above copyright 87087Snate@binkert.org * notice, this list of conditions and the following disclaimer; 97087Snate@binkert.org * redistributions in binary form must reproduce the above copyright 107087Snate@binkert.org * notice, this list of conditions and the following disclaimer in the 117087Snate@binkert.org * documentation and/or other materials provided with the distribution; 127087Snate@binkert.org * neither the name of the copyright holders nor the names of its 137087Snate@binkert.org * contributors may be used to endorse or promote products derived from 145124Sgblack@eecs.umich.edu * this software without specific prior written permission. 155124Sgblack@eecs.umich.edu * 165124Sgblack@eecs.umich.edu * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 175124Sgblack@eecs.umich.edu * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 185124Sgblack@eecs.umich.edu * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 195124Sgblack@eecs.umich.edu * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 205124Sgblack@eecs.umich.edu * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 215124Sgblack@eecs.umich.edu * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 225124Sgblack@eecs.umich.edu * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 235124Sgblack@eecs.umich.edu * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 245124Sgblack@eecs.umich.edu * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 255124Sgblack@eecs.umich.edu * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 265124Sgblack@eecs.umich.edu * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 275124Sgblack@eecs.umich.edu * 285124Sgblack@eecs.umich.edu * Authors: Ali Saidi 295124Sgblack@eecs.umich.edu */ 305124Sgblack@eecs.umich.edu 315124Sgblack@eecs.umich.edu#include "mem/tport.hh" 325124Sgblack@eecs.umich.edu 335124Sgblack@eecs.umich.eduvoid 345124Sgblack@eecs.umich.eduSimpleTimingPort::checkFunctional(PacketPtr pkt) 355124Sgblack@eecs.umich.edu{ 365124Sgblack@eecs.umich.edu DeferredPacketIterator i = transmitList.begin(); 375124Sgblack@eecs.umich.edu DeferredPacketIterator end = transmitList.end(); 385124Sgblack@eecs.umich.edu 395124Sgblack@eecs.umich.edu for (; i != end; ++i) { 405124Sgblack@eecs.umich.edu PacketPtr target = i->pkt; 415124Sgblack@eecs.umich.edu // If the target contains data, and it overlaps the 425124Sgblack@eecs.umich.edu // probed request, need to update data 438961Sgblack@eecs.umich.edu if (target->intersect(pkt)) { 445124Sgblack@eecs.umich.edu if (!fixPacket(pkt, target)) { 458740Sgblack@eecs.umich.edu // fixPacket returns true for continue, false for done 465124Sgblack@eecs.umich.edu return; 475124Sgblack@eecs.umich.edu } 488232Snate@binkert.org } 498740Sgblack@eecs.umich.edu } 505124Sgblack@eecs.umich.edu} 515124Sgblack@eecs.umich.edu 525124Sgblack@eecs.umich.eduvoid 537678Sgblack@eecs.umich.eduSimpleTimingPort::recvFunctional(PacketPtr pkt) 545124Sgblack@eecs.umich.edu{ 558806Sgblack@eecs.umich.edu checkFunctional(pkt); 568806Sgblack@eecs.umich.edu 578806Sgblack@eecs.umich.edu // Just do an atomic access and throw away the returned latency 588806Sgblack@eecs.umich.edu if (pkt->result != Packet::Success) 598806Sgblack@eecs.umich.edu recvAtomic(pkt); 608806Sgblack@eecs.umich.edu} 618806Sgblack@eecs.umich.edu 628806Sgblack@eecs.umich.edubool 638806Sgblack@eecs.umich.eduSimpleTimingPort::recvTiming(PacketPtr pkt) 648806Sgblack@eecs.umich.edu{ 658806Sgblack@eecs.umich.edu // If the device is only a slave, it should only be sending 668806Sgblack@eecs.umich.edu // responses, which should never get nacked. There used to be 678806Sgblack@eecs.umich.edu // code to hanldle nacks here, but I'm pretty sure it didn't work 688806Sgblack@eecs.umich.edu // correctly with the drain code, so that would need to be fixed 698806Sgblack@eecs.umich.edu // if we ever added it back. 708806Sgblack@eecs.umich.edu assert(pkt->result != Packet::Nacked); 718806Sgblack@eecs.umich.edu Tick latency = recvAtomic(pkt); 728806Sgblack@eecs.umich.edu // turn packet around to go back to requester if response expected 738806Sgblack@eecs.umich.edu if (pkt->needsResponse()) { 748806Sgblack@eecs.umich.edu pkt->makeTimingResponse(); 758806Sgblack@eecs.umich.edu schedSendTiming(pkt, latency); 768806Sgblack@eecs.umich.edu } 778806Sgblack@eecs.umich.edu else if (pkt->cmd != MemCmd::UpgradeReq) { 788806Sgblack@eecs.umich.edu delete pkt->req; 798740Sgblack@eecs.umich.edu delete pkt; 808806Sgblack@eecs.umich.edu } 815858Sgblack@eecs.umich.edu return true; 828806Sgblack@eecs.umich.edu} 838806Sgblack@eecs.umich.edu 845858Sgblack@eecs.umich.edu 858806Sgblack@eecs.umich.eduvoid 868806Sgblack@eecs.umich.eduSimpleTimingPort::schedSendTiming(PacketPtr pkt, Tick when) 878806Sgblack@eecs.umich.edu{ 888806Sgblack@eecs.umich.edu assert(when > curTick); 895681Sgblack@eecs.umich.edu 908806Sgblack@eecs.umich.edu // Nothing is on the list: add it and schedule an event 918806Sgblack@eecs.umich.edu if (transmitList.empty()) { 928806Sgblack@eecs.umich.edu assert(!sendEvent->scheduled()); 935124Sgblack@eecs.umich.edu sendEvent->schedule(when); 945909Sgblack@eecs.umich.edu transmitList.push_back(DeferredPacket(when, pkt)); 955909Sgblack@eecs.umich.edu return; 965909Sgblack@eecs.umich.edu } 975909Sgblack@eecs.umich.edu 985909Sgblack@eecs.umich.edu // something is on the list and this belongs at the end 995909Sgblack@eecs.umich.edu if (when >= transmitList.back().tick) { 1005909Sgblack@eecs.umich.edu transmitList.push_back(DeferredPacket(when, pkt)); 1015909Sgblack@eecs.umich.edu return; 1025909Sgblack@eecs.umich.edu } 1035909Sgblack@eecs.umich.edu // Something is on the list and this belongs somewhere else 1045909Sgblack@eecs.umich.edu DeferredPacketIterator i = transmitList.begin(); 1055909Sgblack@eecs.umich.edu DeferredPacketIterator end = transmitList.end(); 1065858Sgblack@eecs.umich.edu 1077678Sgblack@eecs.umich.edu for (; i != end; ++i) { 1085858Sgblack@eecs.umich.edu if (when < i->tick) { 1095858Sgblack@eecs.umich.edu if (i == transmitList.begin()) { 1108806Sgblack@eecs.umich.edu //Inserting at begining, reschedule 1118806Sgblack@eecs.umich.edu sendEvent->reschedule(when); 1128806Sgblack@eecs.umich.edu } 1138806Sgblack@eecs.umich.edu transmitList.insert(i, DeferredPacket(when, pkt)); 1148806Sgblack@eecs.umich.edu return; 1158806Sgblack@eecs.umich.edu } 1168806Sgblack@eecs.umich.edu } 1175858Sgblack@eecs.umich.edu assert(false); // should never get here 1185858Sgblack@eecs.umich.edu} 1197678Sgblack@eecs.umich.edu 1205858Sgblack@eecs.umich.edu 1215858Sgblack@eecs.umich.eduvoid 1225858Sgblack@eecs.umich.eduSimpleTimingPort::sendDeferredPacket() 1235858Sgblack@eecs.umich.edu{ 1248740Sgblack@eecs.umich.edu assert(deferredPacketReady()); 1258740Sgblack@eecs.umich.edu bool success = sendTiming(transmitList.front().pkt); 1268740Sgblack@eecs.umich.edu 1278740Sgblack@eecs.umich.edu if (success) { 1288740Sgblack@eecs.umich.edu //send successful, remove packet 1298740Sgblack@eecs.umich.edu transmitList.pop_front(); 1308740Sgblack@eecs.umich.edu if (!transmitList.empty()) { 1318740Sgblack@eecs.umich.edu Tick time = transmitList.front().tick; 1328740Sgblack@eecs.umich.edu sendEvent->schedule(time <= curTick ? curTick+1 : time); 1338740Sgblack@eecs.umich.edu } 1348740Sgblack@eecs.umich.edu 1357678Sgblack@eecs.umich.edu if (transmitList.empty() && drainEvent) { 1365858Sgblack@eecs.umich.edu drainEvent->process(); 1378740Sgblack@eecs.umich.edu drainEvent = NULL; 1388740Sgblack@eecs.umich.edu } 1398740Sgblack@eecs.umich.edu } 1408740Sgblack@eecs.umich.edu 1418740Sgblack@eecs.umich.edu waitingOnRetry = !success; 1428740Sgblack@eecs.umich.edu 1438740Sgblack@eecs.umich.edu if (waitingOnRetry) { 1448740Sgblack@eecs.umich.edu DPRINTF(Bus, "Send failed, waiting on retry\n"); 1458740Sgblack@eecs.umich.edu } 1468740Sgblack@eecs.umich.edu} 1478740Sgblack@eecs.umich.edu 1488740Sgblack@eecs.umich.edu 1498740Sgblack@eecs.umich.eduvoid 1508740Sgblack@eecs.umich.eduSimpleTimingPort::recvRetry() 1515858Sgblack@eecs.umich.edu{ 1528740Sgblack@eecs.umich.edu DPRINTF(Bus, "Received retry\n"); 1538740Sgblack@eecs.umich.edu assert(waitingOnRetry); 1548740Sgblack@eecs.umich.edu sendDeferredPacket(); 1558740Sgblack@eecs.umich.edu} 1568740Sgblack@eecs.umich.edu 1578740Sgblack@eecs.umich.edu 1588740Sgblack@eecs.umich.eduvoid 1598740Sgblack@eecs.umich.eduSimpleTimingPort::processSendEvent() 1608740Sgblack@eecs.umich.edu{ 1615858Sgblack@eecs.umich.edu assert(!waitingOnRetry); 1625858Sgblack@eecs.umich.edu sendDeferredPacket(); 1635237Sgblack@eecs.umich.edu} 1645909Sgblack@eecs.umich.edu 1655909Sgblack@eecs.umich.edu 1665909Sgblack@eecs.umich.eduunsigned int 1675909Sgblack@eecs.umich.eduSimpleTimingPort::drain(Event *de) 1685909Sgblack@eecs.umich.edu{ 1695909Sgblack@eecs.umich.edu if (transmitList.size() == 0) 1705909Sgblack@eecs.umich.edu return 0; 1715909Sgblack@eecs.umich.edu drainEvent = de; 1726048Sgblack@eecs.umich.edu return 1; 1737678Sgblack@eecs.umich.edu} 1746048Sgblack@eecs.umich.edu