dma_device.cc revision 8708
12381SN/A/* 22592SN/A * Copyright (c) 2006 The Regents of The University of Michigan 32381SN/A * All rights reserved. 42381SN/A * 52381SN/A * Redistribution and use in source and binary forms, with or without 62381SN/A * modification, are permitted provided that the following conditions are 72381SN/A * met: redistributions of source code must retain the above copyright 82381SN/A * notice, this list of conditions and the following disclaimer; 92381SN/A * redistributions in binary form must reproduce the above copyright 102381SN/A * notice, this list of conditions and the following disclaimer in the 112381SN/A * documentation and/or other materials provided with the distribution; 122381SN/A * neither the name of the copyright holders nor the names of its 132381SN/A * contributors may be used to endorse or promote products derived from 142381SN/A * this software without specific prior written permission. 152381SN/A * 162381SN/A * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 172381SN/A * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 182381SN/A * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 192381SN/A * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 202381SN/A * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 212381SN/A * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 222381SN/A * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 232381SN/A * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 242381SN/A * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 252381SN/A * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 262381SN/A * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 272665Ssaidi@eecs.umich.edu * 282665Ssaidi@eecs.umich.edu * Authors: Ali Saidi 292665Ssaidi@eecs.umich.edu * Nathan Binkert 302665Ssaidi@eecs.umich.edu */ 312381SN/A 322381SN/A#include "base/chunk_generator.hh" 332381SN/A#include "base/trace.hh" 342381SN/A#include "debug/BusAddrRanges.hh" 352662Sstever@eecs.umich.edu#include "debug/DMA.hh" 362381SN/A#include "dev/io_device.hh" 372381SN/A#include "sim/system.hh" 382381SN/A 392381SN/APioPort::PioPort(PioDevice *dev, System *s, std::string pname) 402381SN/A : SimpleTimingPort(dev->name() + pname, dev), device(dev) 413348Sbinkertn@umich.edu{ } 423348Sbinkertn@umich.edu 434022Sstever@eecs.umich.edu 443348Sbinkertn@umich.eduTick 454024Sbinkertn@umich.eduPioPort::recvAtomic(PacketPtr pkt) 464610Ssaidi@eecs.umich.edu{ 473940Ssaidi@eecs.umich.edu return pkt->isRead() ? device->read(pkt) : device->write(pkt); 482392SN/A} 492980Sgblack@eecs.umich.edu 504167Sbinkertn@umich.eduvoid 512394SN/APioPort::getDeviceAddressRanges(AddrRangeList &resp, bool &snoop) 523940Ssaidi@eecs.umich.edu{ 532394SN/A snoop = false; 543349Sbinkertn@umich.edu device->addressRanges(resp); 552394SN/A for (AddrRangeIter i = resp.begin(); i != resp.end(); i++) 562812Srdreslin@umich.edu DPRINTF(BusAddrRanges, "Adding Range %#x-%#x\n", i->start, i->end); 572812Srdreslin@umich.edu} 584022Sstever@eecs.umich.edu 594022Sstever@eecs.umich.edu 604022Sstever@eecs.umich.eduPioDevice::PioDevice(const Params *p) 614022Sstever@eecs.umich.edu : MemObject(p), platform(p->platform), sys(p->system), pioPort(NULL) 624022Sstever@eecs.umich.edu{} 634022Sstever@eecs.umich.edu 644022Sstever@eecs.umich.eduPioDevice::~PioDevice() 654022Sstever@eecs.umich.edu{ 664022Sstever@eecs.umich.edu if (pioPort) 674473Sstever@eecs.umich.edu delete pioPort; 684022Sstever@eecs.umich.edu} 694022Sstever@eecs.umich.edu 704022Sstever@eecs.umich.eduvoid 714022Sstever@eecs.umich.eduPioDevice::init() 724022Sstever@eecs.umich.edu{ 734022Sstever@eecs.umich.edu if (!pioPort) 744022Sstever@eecs.umich.edu panic("Pio port of %s not connected to anything!", name()); 754022Sstever@eecs.umich.edu pioPort->sendStatusChange(Port::RangeChange); 764022Sstever@eecs.umich.edu} 774022Sstever@eecs.umich.edu 784628Sstever@eecs.umich.eduPort * 794022Sstever@eecs.umich.eduPioDevice::getPort(const std::string &if_name, int idx) 804022Sstever@eecs.umich.edu{ 814626Sstever@eecs.umich.edu if (if_name == "pio") { 824626Sstever@eecs.umich.edu if (pioPort != NULL) 834626Sstever@eecs.umich.edu fatal("%s: pio port already connected to %s", 844626Sstever@eecs.umich.edu name(), pioPort->getPeer()->name()); 854040Ssaidi@eecs.umich.edu pioPort = new PioPort(this, sys); 864040Ssaidi@eecs.umich.edu return pioPort; 874870Sstever@eecs.umich.edu } 884870Sstever@eecs.umich.edu return NULL; 894870Sstever@eecs.umich.edu} 904870Sstever@eecs.umich.edu 914870Sstever@eecs.umich.eduunsigned int 924870Sstever@eecs.umich.eduPioDevice::drain(Event *de) 934870Sstever@eecs.umich.edu{ 944022Sstever@eecs.umich.edu unsigned int count; 954022Sstever@eecs.umich.edu count = pioPort->drain(de); 964022Sstever@eecs.umich.edu if (count) 974022Sstever@eecs.umich.edu changeState(Draining); 984022Sstever@eecs.umich.edu else 994022Sstever@eecs.umich.edu changeState(Drained); 1004022Sstever@eecs.umich.edu return count; 1014626Sstever@eecs.umich.edu} 1024626Sstever@eecs.umich.edu 1034626Sstever@eecs.umich.eduBasicPioDevice::BasicPioDevice(const Params *p) 1044022Sstever@eecs.umich.edu : PioDevice(p), pioAddr(p->pio_addr), pioSize(0), 1054626Sstever@eecs.umich.edu pioDelay(p->pio_latency) 1064626Sstever@eecs.umich.edu{} 1074626Sstever@eecs.umich.edu 1084626Sstever@eecs.umich.eduvoid 1094022Sstever@eecs.umich.eduBasicPioDevice::addressRanges(AddrRangeList &range_list) 1104022Sstever@eecs.umich.edu{ 1114626Sstever@eecs.umich.edu assert(pioSize != 0); 1124626Sstever@eecs.umich.edu range_list.clear(); 1134870Sstever@eecs.umich.edu DPRINTF(BusAddrRanges, "registering range: %#x-%#x\n", pioAddr, pioSize); 1144022Sstever@eecs.umich.edu range_list.push_back(RangeSize(pioAddr, pioSize)); 1154022Sstever@eecs.umich.edu} 1164022Sstever@eecs.umich.edu 1174022Sstever@eecs.umich.edu 1184022Sstever@eecs.umich.eduDmaPort::DmaPort(MemObject *dev, System *s, Tick min_backoff, Tick max_backoff, 1194022Sstever@eecs.umich.edu bool recv_snoops) 1204022Sstever@eecs.umich.edu : Port(dev->name() + "-dmaport", dev), device(dev), sys(s), 1214022Sstever@eecs.umich.edu pendingCount(0), actionInProgress(0), drainEvent(NULL), 1224022Sstever@eecs.umich.edu backoffTime(0), minBackoffDelay(min_backoff), 1234022Sstever@eecs.umich.edu maxBackoffDelay(max_backoff), inRetry(false), recvSnoops(recv_snoops), 1244022Sstever@eecs.umich.edu snoopRangeSent(false), backoffEvent(this) 1254022Sstever@eecs.umich.edu{ } 1264022Sstever@eecs.umich.edu 1274022Sstever@eecs.umich.edubool 1284022Sstever@eecs.umich.eduDmaPort::recvTiming(PacketPtr pkt) 1294022Sstever@eecs.umich.edu{ 1304022Sstever@eecs.umich.edu if (pkt->wasNacked()) { 1314022Sstever@eecs.umich.edu DPRINTF(DMA, "Received nacked %s addr %#x\n", 1324022Sstever@eecs.umich.edu pkt->cmdString(), pkt->getAddr()); 1334022Sstever@eecs.umich.edu 1344022Sstever@eecs.umich.edu if (backoffTime < minBackoffDelay) 1354022Sstever@eecs.umich.edu backoffTime = minBackoffDelay; 1364022Sstever@eecs.umich.edu else if (backoffTime < maxBackoffDelay) 1374022Sstever@eecs.umich.edu backoffTime <<= 1; 1384022Sstever@eecs.umich.edu 1394022Sstever@eecs.umich.edu device->reschedule(backoffEvent, curTick() + backoffTime, true); 1404022Sstever@eecs.umich.edu 1414022Sstever@eecs.umich.edu DPRINTF(DMA, "Backoff time set to %d ticks\n", backoffTime); 1424022Sstever@eecs.umich.edu 1434022Sstever@eecs.umich.edu pkt->reinitNacked(); 1444022Sstever@eecs.umich.edu queueDma(pkt, true); 1454022Sstever@eecs.umich.edu } else if (pkt->isRequest() && recvSnoops) { 1464870Sstever@eecs.umich.edu return true; 1474022Sstever@eecs.umich.edu } else if (pkt->senderState) { 1484022Sstever@eecs.umich.edu DmaReqState *state; 1494022Sstever@eecs.umich.edu backoffTime >>= 2; 1504626Sstever@eecs.umich.edu 1514626Sstever@eecs.umich.edu DPRINTF(DMA, "Received response %s addr %#x size %#x\n", 1524870Sstever@eecs.umich.edu pkt->cmdString(), pkt->getAddr(), pkt->req->getSize()); 1534022Sstever@eecs.umich.edu state = dynamic_cast<DmaReqState*>(pkt->senderState); 1544022Sstever@eecs.umich.edu pendingCount--; 1554022Sstever@eecs.umich.edu 1564022Sstever@eecs.umich.edu assert(pendingCount >= 0); 1574022Sstever@eecs.umich.edu assert(state); 1584022Sstever@eecs.umich.edu 1594022Sstever@eecs.umich.edu // We shouldn't ever get a block in ownership state 1604022Sstever@eecs.umich.edu assert(!(pkt->memInhibitAsserted() && !pkt->sharedAsserted())); 1614022Sstever@eecs.umich.edu 1624022Sstever@eecs.umich.edu state->numBytes += pkt->req->getSize(); 1634022Sstever@eecs.umich.edu assert(state->totBytes >= state->numBytes); 1644022Sstever@eecs.umich.edu if (state->totBytes == state->numBytes) { 1654022Sstever@eecs.umich.edu if (state->completionEvent) { 1664022Sstever@eecs.umich.edu if (state->delay) 1674022Sstever@eecs.umich.edu device->schedule(state->completionEvent, 1684022Sstever@eecs.umich.edu curTick() + state->delay); 1694022Sstever@eecs.umich.edu else 1704022Sstever@eecs.umich.edu state->completionEvent->process(); 1714022Sstever@eecs.umich.edu } 1724022Sstever@eecs.umich.edu delete state; 1734022Sstever@eecs.umich.edu } 1744022Sstever@eecs.umich.edu delete pkt->req; 1754022Sstever@eecs.umich.edu delete pkt; 1764022Sstever@eecs.umich.edu 1774022Sstever@eecs.umich.edu if (pendingCount == 0 && drainEvent) { 1784022Sstever@eecs.umich.edu drainEvent->process(); 1794022Sstever@eecs.umich.edu drainEvent = NULL; 1804022Sstever@eecs.umich.edu } 1814022Sstever@eecs.umich.edu } else { 1824022Sstever@eecs.umich.edu panic("Got packet without sender state... huh?\n"); 1832381SN/A } 1842662Sstever@eecs.umich.edu 1852662Sstever@eecs.umich.edu return true; 1862662Sstever@eecs.umich.edu} 1872662Sstever@eecs.umich.edu 1882662Sstever@eecs.umich.eduDmaDevice::DmaDevice(const Params *p) 1892381SN/A : PioDevice(p), dmaPort(NULL) 1904610Ssaidi@eecs.umich.edu{ } 1912381SN/A 1922813Srdreslin@umich.edu 1934022Sstever@eecs.umich.eduunsigned int 1944022Sstever@eecs.umich.eduDmaDevice::drain(Event *de) 1954022Sstever@eecs.umich.edu{ 1964870Sstever@eecs.umich.edu unsigned int count; 1974870Sstever@eecs.umich.edu count = pioPort->drain(de) + dmaPort->drain(de); 1984870Sstever@eecs.umich.edu if (count) 1994870Sstever@eecs.umich.edu changeState(Draining); 2004870Sstever@eecs.umich.edu else 2014870Sstever@eecs.umich.edu changeState(Drained); 2022566SN/A return count; 2032662Sstever@eecs.umich.edu} 2042662Sstever@eecs.umich.edu 2052662Sstever@eecs.umich.eduunsigned int 2062662Sstever@eecs.umich.eduDmaPort::drain(Event *de) 2072662Sstever@eecs.umich.edu{ 2082566SN/A if (pendingCount == 0) 2092566SN/A return 0; 2102566SN/A drainEvent = de; 2112662Sstever@eecs.umich.edu return 1; 2122662Sstever@eecs.umich.edu} 2132566SN/A 2142662Sstever@eecs.umich.edu 2152662Sstever@eecs.umich.eduvoid 2162566SN/ADmaPort::recvRetry() 2172662Sstever@eecs.umich.edu{ 2182662Sstever@eecs.umich.edu assert(transmitList.size()); 2192566SN/A bool result = true; 2202566SN/A do { 2212662Sstever@eecs.umich.edu PacketPtr pkt = transmitList.front(); 2222662Sstever@eecs.umich.edu DPRINTF(DMA, "Retry on %s addr %#x\n", 2232381SN/A pkt->cmdString(), pkt->getAddr()); 2242381SN/A result = sendTiming(pkt); 2252662Sstever@eecs.umich.edu if (result) { 2262381SN/A DPRINTF(DMA, "-- Done\n"); 2272381SN/A transmitList.pop_front(); 2282662Sstever@eecs.umich.edu inRetry = false; 2292662Sstever@eecs.umich.edu } else { 2302662Sstever@eecs.umich.edu inRetry = true; 2313349Sbinkertn@umich.edu DPRINTF(DMA, "-- Failed, queued\n"); 2322381SN/A } 2332381SN/A } while (!backoffTime && result && transmitList.size()); 2342662Sstever@eecs.umich.edu 2352662Sstever@eecs.umich.edu if (transmitList.size() && backoffTime && !inRetry) { 2362662Sstever@eecs.umich.edu DPRINTF(DMA, "Scheduling backoff for %d\n", curTick()+backoffTime); 2372662Sstever@eecs.umich.edu if (!backoffEvent.scheduled()) 2382662Sstever@eecs.umich.edu device->schedule(backoffEvent, backoffTime + curTick()); 2392641Sstever@eecs.umich.edu } 2402641Sstever@eecs.umich.edu DPRINTF(DMA, "TransmitList: %d, backoffTime: %d inRetry: %d es: %d\n", 2414870Sstever@eecs.umich.edu transmitList.size(), backoffTime, inRetry, 2424870Sstever@eecs.umich.edu backoffEvent.scheduled()); 2434870Sstever@eecs.umich.edu} 2444870Sstever@eecs.umich.edu 2454870Sstever@eecs.umich.edu 2464870Sstever@eecs.umich.eduvoid 2474870Sstever@eecs.umich.eduDmaPort::dmaAction(Packet::Command cmd, Addr addr, int size, Event *event, 2482663Sstever@eecs.umich.edu uint8_t *data, Tick delay, Request::Flags flag) 2492663Sstever@eecs.umich.edu{ 2502662Sstever@eecs.umich.edu assert(device->getState() == SimObject::Running); 2512641Sstever@eecs.umich.edu 2524870Sstever@eecs.umich.edu DmaReqState *reqState = new DmaReqState(event, this, size, delay); 2532813Srdreslin@umich.edu 2544870Sstever@eecs.umich.edu 2554895Sstever@eecs.umich.edu DPRINTF(DMA, "Starting DMA for addr: %#x size: %d sched: %d\n", addr, size, 2564626Sstever@eecs.umich.edu event ? event->scheduled() : -1 ); 2574626Sstever@eecs.umich.edu for (ChunkGenerator gen(addr, size, peerBlockSize()); 2584895Sstever@eecs.umich.edu !gen.done(); gen.next()) { 2594916Sstever@eecs.umich.edu Request *req = new Request(gen.addr(), gen.size(), flag); 2604895Sstever@eecs.umich.edu PacketPtr pkt = new Packet(req, cmd, Packet::Broadcast); 2614916Sstever@eecs.umich.edu 2624916Sstever@eecs.umich.edu // Increment the data pointer on a write 2634916Sstever@eecs.umich.edu if (data) 2644870Sstever@eecs.umich.edu pkt->dataStatic(data + gen.complete()); 2654626Sstever@eecs.umich.edu 2664626Sstever@eecs.umich.edu pkt->senderState = reqState; 2674870Sstever@eecs.umich.edu 2684870Sstever@eecs.umich.edu assert(pendingCount >= 0); 2692641Sstever@eecs.umich.edu pendingCount++; 2702641Sstever@eecs.umich.edu DPRINTF(DMA, "--Queuing DMA for addr: %#x size: %d\n", gen.addr(), 2712641Sstever@eecs.umich.edu gen.size()); 2722811Srdreslin@umich.edu queueDma(pkt); 2732811Srdreslin@umich.edu } 2742811Srdreslin@umich.edu 2753218Sgblack@eecs.umich.edu} 2763218Sgblack@eecs.umich.edu 2773218Sgblack@eecs.umich.eduvoid 2783218Sgblack@eecs.umich.eduDmaPort::queueDma(PacketPtr pkt, bool front) 2793218Sgblack@eecs.umich.edu{ 2803218Sgblack@eecs.umich.edu 2812662Sstever@eecs.umich.edu if (front) 2822662Sstever@eecs.umich.edu transmitList.push_front(pkt); 2832623SN/A else 2842623SN/A transmitList.push_back(pkt); 2852662Sstever@eecs.umich.edu sendDma(); 2862662Sstever@eecs.umich.edu} 2872662Sstever@eecs.umich.edu 2882662Sstever@eecs.umich.edu 2892662Sstever@eecs.umich.eduvoid 2902662Sstever@eecs.umich.eduDmaPort::sendDma() 2912662Sstever@eecs.umich.edu{ 2924610Ssaidi@eecs.umich.edu // some kind of selction between access methods 2932641Sstever@eecs.umich.edu // more work is going to have to be done to make 2942641Sstever@eecs.umich.edu // switching actually work 2952641Sstever@eecs.umich.edu assert(transmitList.size()); 2962641Sstever@eecs.umich.edu PacketPtr pkt = transmitList.front(); 2972662Sstever@eecs.umich.edu 2982662Sstever@eecs.umich.edu Enums::MemoryMode state = sys->getMemoryMode(); 2992662Sstever@eecs.umich.edu if (state == Enums::timing) { 3002641Sstever@eecs.umich.edu if (backoffEvent.scheduled() || inRetry) { 3012662Sstever@eecs.umich.edu DPRINTF(DMA, "Can't send immediately, waiting for retry or backoff timer\n"); 3022662Sstever@eecs.umich.edu return; 3034022Sstever@eecs.umich.edu } 3042811Srdreslin@umich.edu 3052811Srdreslin@umich.edu DPRINTF(DMA, "Attempting to send %s addr %#x\n", 3064022Sstever@eecs.umich.edu pkt->cmdString(), pkt->getAddr()); 3072811Srdreslin@umich.edu 3084022Sstever@eecs.umich.edu bool result; 3094022Sstever@eecs.umich.edu do { 3104022Sstever@eecs.umich.edu result = sendTiming(pkt); 3114022Sstever@eecs.umich.edu if (result) { 3124870Sstever@eecs.umich.edu transmitList.pop_front(); 3134022Sstever@eecs.umich.edu DPRINTF(DMA, "-- Done\n"); 3144022Sstever@eecs.umich.edu } else { 3154022Sstever@eecs.umich.edu inRetry = true; 3164040Ssaidi@eecs.umich.edu DPRINTF(DMA, "-- Failed: queued\n"); 3174626Sstever@eecs.umich.edu } 3184870Sstever@eecs.umich.edu } while (result && !backoffTime && transmitList.size()); 3192812Srdreslin@umich.edu 3204870Sstever@eecs.umich.edu if (transmitList.size() && backoffTime && !inRetry && 3214870Sstever@eecs.umich.edu !backoffEvent.scheduled()) { 3224916Sstever@eecs.umich.edu DPRINTF(DMA, "-- Scheduling backoff timer for %d\n", 3234870Sstever@eecs.umich.edu backoffTime+curTick()); 3244870Sstever@eecs.umich.edu device->schedule(backoffEvent, backoffTime + curTick()); 3254870Sstever@eecs.umich.edu } 3264895Sstever@eecs.umich.edu } else if (state == Enums::atomic) { 3274895Sstever@eecs.umich.edu transmitList.pop_front(); 3284895Sstever@eecs.umich.edu 3294916Sstever@eecs.umich.edu Tick lat; 3304916Sstever@eecs.umich.edu DPRINTF(DMA, "--Sending DMA for addr: %#x size: %d\n", 3314895Sstever@eecs.umich.edu pkt->req->getPaddr(), pkt->req->getSize()); 3324870Sstever@eecs.umich.edu lat = sendAtomic(pkt); 3334870Sstever@eecs.umich.edu assert(pkt->senderState); 3344870Sstever@eecs.umich.edu DmaReqState *state = dynamic_cast<DmaReqState*>(pkt->senderState); 3354870Sstever@eecs.umich.edu assert(state); 3364870Sstever@eecs.umich.edu state->numBytes += pkt->req->getSize(); 3374870Sstever@eecs.umich.edu 3384870Sstever@eecs.umich.edu DPRINTF(DMA, "--Received response for DMA for addr: %#x size: %d nb: %d, tot: %d sched %d\n", 3392814Srdreslin@umich.edu pkt->req->getPaddr(), pkt->req->getSize(), state->numBytes, 3403940Ssaidi@eecs.umich.edu state->totBytes, 3412641Sstever@eecs.umich.edu state->completionEvent ? state->completionEvent->scheduled() : 0 ); 3422381SN/A 3434870Sstever@eecs.umich.edu if (state->totBytes == state->numBytes) { 3442641Sstever@eecs.umich.edu if (state->completionEvent) { 3454626Sstever@eecs.umich.edu assert(!state->completionEvent->scheduled()); 3464626Sstever@eecs.umich.edu device->schedule(state->completionEvent, 3472381SN/A curTick() + lat + state->delay); 3482381SN/A } 3492381SN/A delete state; 3504870Sstever@eecs.umich.edu delete pkt->req; 3514870Sstever@eecs.umich.edu } 3522549SN/A pendingCount--; 3532663Sstever@eecs.umich.edu assert(pendingCount >= 0); 3544870Sstever@eecs.umich.edu delete pkt; 3552883Srdreslin@umich.edu 3562813Srdreslin@umich.edu if (pendingCount == 0 && drainEvent) { 3572662Sstever@eecs.umich.edu drainEvent->process(); 3582662Sstever@eecs.umich.edu drainEvent = NULL; 3592662Sstever@eecs.umich.edu } 3602662Sstever@eecs.umich.edu 3614022Sstever@eecs.umich.edu } else 3624870Sstever@eecs.umich.edu panic("Unknown memory command state."); 3634870Sstever@eecs.umich.edu} 3642641Sstever@eecs.umich.edu 3654870Sstever@eecs.umich.eduDmaDevice::~DmaDevice() 3664870Sstever@eecs.umich.edu{ 3672641Sstever@eecs.umich.edu if (dmaPort) 3682813Srdreslin@umich.edu delete dmaPort; 3692813Srdreslin@umich.edu} 3702813Srdreslin@umich.edu 3712813Srdreslin@umich.edu 3722813Srdreslin@umich.eduPort * 3734022Sstever@eecs.umich.eduDmaDevice::getPort(const std::string &if_name, int idx) 3744870Sstever@eecs.umich.edu{ 3754870Sstever@eecs.umich.edu if (if_name == "dma") { 3764626Sstever@eecs.umich.edu if (dmaPort != NULL) 3774870Sstever@eecs.umich.edu fatal("%s: dma port already connected to %s", 3784870Sstever@eecs.umich.edu name(), dmaPort->getPeer()->name()); 3792813Srdreslin@umich.edu dmaPort = new DmaPort(this, sys, params()->min_backoff_delay, 3804626Sstever@eecs.umich.edu params()->max_backoff_delay); 3814626Sstever@eecs.umich.edu return dmaPort; 3824626Sstever@eecs.umich.edu } 3834887Sstever@eecs.umich.edu return PioDevice::getPort(if_name, idx); 3844887Sstever@eecs.umich.edu} 3854887Sstever@eecs.umich.edu 3864887Sstever@eecs.umich.edu