tport.cc revision 3284
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(); 393284Srdreslin@umich.edu for (; i != end; ++i) { 403284Srdreslin@umich.edu Packet * target = *i; 413284Srdreslin@umich.edu // If the target contains data, and it overlaps the 423284Srdreslin@umich.edu // probed request, need to update data 433284Srdreslin@umich.edu if (target->intersect(pkt)) { 443284Srdreslin@umich.edu uint8_t* pkt_data; 453284Srdreslin@umich.edu uint8_t* write_data; 463284Srdreslin@umich.edu int data_size; 473284Srdreslin@umich.edu if (target->getAddr() < pkt->getAddr()) { 483284Srdreslin@umich.edu int offset = pkt->getAddr() - target->getAddr(); 493284Srdreslin@umich.edu pkt_data = pkt->getPtr<uint8_t>(); 503284Srdreslin@umich.edu write_data = target->getPtr<uint8_t>() + offset; 513284Srdreslin@umich.edu data_size = target->getSize() - offset; 523284Srdreslin@umich.edu assert(data_size > 0); 533284Srdreslin@umich.edu if (data_size > pkt->getSize()) 543284Srdreslin@umich.edu data_size = pkt->getSize(); 553284Srdreslin@umich.edu } else { 563284Srdreslin@umich.edu int offset = target->getAddr() - pkt->getAddr(); 573284Srdreslin@umich.edu pkt_data = pkt->getPtr<uint8_t>() + offset; 583284Srdreslin@umich.edu write_data = target->getPtr<uint8_t>(); 593284Srdreslin@umich.edu data_size = pkt->getSize() - offset; 603284Srdreslin@umich.edu assert(data_size > pkt->getSize()); 613284Srdreslin@umich.edu if (data_size > target->getSize()) 623284Srdreslin@umich.edu data_size = target->getSize(); 633284Srdreslin@umich.edu } 643284Srdreslin@umich.edu 653284Srdreslin@umich.edu if (pkt->isWrite()) { 663284Srdreslin@umich.edu memcpy(pkt_data, write_data, data_size); 673284Srdreslin@umich.edu } else { 683284Srdreslin@umich.edu memcpy(write_data, pkt_data, data_size); 693284Srdreslin@umich.edu } 703284Srdreslin@umich.edu } 713284Srdreslin@umich.edu } 723284Srdreslin@umich.edu //Then just do an atomic access and throw away the returned latency 733091Sstever@eecs.umich.edu recvAtomic(pkt); 743091Sstever@eecs.umich.edu} 753091Sstever@eecs.umich.edu 763091Sstever@eecs.umich.edubool 773091Sstever@eecs.umich.eduSimpleTimingPort::recvTiming(Packet *pkt) 783091Sstever@eecs.umich.edu{ 793091Sstever@eecs.umich.edu // If the device is only a slave, it should only be sending 803091Sstever@eecs.umich.edu // responses, which should never get nacked. There used to be 813091Sstever@eecs.umich.edu // code to hanldle nacks here, but I'm pretty sure it didn't work 823091Sstever@eecs.umich.edu // correctly with the drain code, so that would need to be fixed 833091Sstever@eecs.umich.edu // if we ever added it back. 843091Sstever@eecs.umich.edu assert(pkt->result != Packet::Nacked); 853091Sstever@eecs.umich.edu Tick latency = recvAtomic(pkt); 863175Srdreslin@umich.edu // turn packet around to go back to requester if response expected 873175Srdreslin@umich.edu if (pkt->needsResponse()) { 883175Srdreslin@umich.edu pkt->makeTimingResponse(); 893175Srdreslin@umich.edu sendTimingLater(pkt, latency); 903175Srdreslin@umich.edu } 913091Sstever@eecs.umich.edu return true; 923091Sstever@eecs.umich.edu} 933091Sstever@eecs.umich.edu 943091Sstever@eecs.umich.eduvoid 952914Ssaidi@eecs.umich.eduSimpleTimingPort::recvRetry() 962914Ssaidi@eecs.umich.edu{ 973263Srdreslin@umich.edu assert(outTiming > 0); 983263Srdreslin@umich.edu assert(!transmitList.empty()); 993263Srdreslin@umich.edu if (sendTiming(transmitList.front())) { 1003263Srdreslin@umich.edu transmitList.pop_front(); 1013263Srdreslin@umich.edu outTiming--; 1023263Srdreslin@umich.edu DPRINTF(Bus, "No Longer waiting on retry\n"); 1033263Srdreslin@umich.edu if (!transmitList.empty()) 1043263Srdreslin@umich.edu sendTimingLater(transmitList.front(), 1); 1053263Srdreslin@umich.edu } 1063219Sgblack@eecs.umich.edu 1073263Srdreslin@umich.edu if (transmitList.empty() && drainEvent) { 1083091Sstever@eecs.umich.edu drainEvent->process(); 1093091Sstever@eecs.umich.edu drainEvent = NULL; 1103091Sstever@eecs.umich.edu } 1112914Ssaidi@eecs.umich.edu} 1122914Ssaidi@eecs.umich.edu 1132914Ssaidi@eecs.umich.eduvoid 1142914Ssaidi@eecs.umich.eduSimpleTimingPort::SendEvent::process() 1152914Ssaidi@eecs.umich.edu{ 1163263Srdreslin@umich.edu assert(port->outTiming > 0); 1173263Srdreslin@umich.edu if (!port->transmitList.empty() && port->transmitList.front() != packet) { 1183263Srdreslin@umich.edu //We are not the head of the list 1193219Sgblack@eecs.umich.edu port->transmitList.push_back(packet); 1203241Sgblack@eecs.umich.edu } else if (port->sendTiming(packet)) { 1213219Sgblack@eecs.umich.edu // send successful 1223263Srdreslin@umich.edu if (port->transmitList.size()) { 1233263Srdreslin@umich.edu port->transmitList.pop_front(); 1243263Srdreslin@umich.edu port->outTiming--; 1253263Srdreslin@umich.edu if (!port->transmitList.empty()) 1263263Srdreslin@umich.edu port->sendTimingLater(port->transmitList.front(), 1); 1273263Srdreslin@umich.edu } 1283263Srdreslin@umich.edu if (port->transmitList.empty() && port->drainEvent) { 1293091Sstever@eecs.umich.edu port->drainEvent->process(); 1303091Sstever@eecs.umich.edu port->drainEvent = NULL; 1313091Sstever@eecs.umich.edu } 1323091Sstever@eecs.umich.edu } else { 1333091Sstever@eecs.umich.edu // send unsuccessful (due to flow control). Will get retry 1343263Srdreslin@umich.edu // callback later; save for then if not already 1353263Srdreslin@umich.edu DPRINTF(Bus, "Waiting on retry\n"); 1363263Srdreslin@umich.edu if (!(port->transmitList.front() == packet)) 1373263Srdreslin@umich.edu port->transmitList.push_back(packet); 1383091Sstever@eecs.umich.edu } 1392914Ssaidi@eecs.umich.edu} 1402914Ssaidi@eecs.umich.edu 1412914Ssaidi@eecs.umich.edu 1422914Ssaidi@eecs.umich.eduunsigned int 1432914Ssaidi@eecs.umich.eduSimpleTimingPort::drain(Event *de) 1442914Ssaidi@eecs.umich.edu{ 1452914Ssaidi@eecs.umich.edu if (outTiming == 0 && transmitList.size() == 0) 1462914Ssaidi@eecs.umich.edu return 0; 1472914Ssaidi@eecs.umich.edu drainEvent = de; 1482914Ssaidi@eecs.umich.edu return 1; 1492914Ssaidi@eecs.umich.edu} 150