io_device.cc revision 8674
1545SN/A/* 22512SN/A * Copyright (c) 2006 The Regents of The University of Michigan 3545SN/A * All rights reserved. 4545SN/A * 5545SN/A * Redistribution and use in source and binary forms, with or without 6545SN/A * modification, are permitted provided that the following conditions are 7545SN/A * met: redistributions of source code must retain the above copyright 8545SN/A * notice, this list of conditions and the following disclaimer; 9545SN/A * redistributions in binary form must reproduce the above copyright 10545SN/A * notice, this list of conditions and the following disclaimer in the 11545SN/A * documentation and/or other materials provided with the distribution; 12545SN/A * neither the name of the copyright holders nor the names of its 13545SN/A * contributors may be used to endorse or promote products derived from 14545SN/A * this software without specific prior written permission. 15545SN/A * 16545SN/A * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 17545SN/A * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 18545SN/A * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 19545SN/A * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 20545SN/A * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 21545SN/A * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 22545SN/A * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23545SN/A * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24545SN/A * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25545SN/A * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 26545SN/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 30545SN/A */ 31545SN/A 323090Sstever@eecs.umich.edu#include "base/chunk_generator.hh" 332657Ssaidi@eecs.umich.edu#include "base/trace.hh" 348232Snate@binkert.org#include "debug/BusAddrRanges.hh" 358232Snate@binkert.org#include "debug/DMA.hh" 36545SN/A#include "dev/io_device.hh" 372901Ssaidi@eecs.umich.edu#include "sim/system.hh" 38545SN/A 392901Ssaidi@eecs.umich.eduPioPort::PioPort(PioDevice *dev, System *s, std::string pname) 403401Sktlim@umich.edu : SimpleTimingPort(dev->name() + pname, dev), device(dev) 412489SN/A{ } 422489SN/A 432489SN/A 442489SN/ATick 453349Sbinkertn@umich.eduPioPort::recvAtomic(PacketPtr pkt) 462489SN/A{ 473091Sstever@eecs.umich.edu return pkt->isRead() ? device->read(pkt) : device->write(pkt); 482489SN/A} 492489SN/A 502489SN/Avoid 514475Sstever@eecs.umich.eduPioPort::getDeviceAddressRanges(AddrRangeList &resp, bool &snoop) 522489SN/A{ 534475Sstever@eecs.umich.edu snoop = false; 542521SN/A device->addressRanges(resp); 557729SAli.Saidi@ARM.com for (AddrRangeIter i = resp.begin(); i != resp.end(); i++) 567729SAli.Saidi@ARM.com DPRINTF(BusAddrRanges, "Adding Range %#x-%#x\n", i->start, i->end); 572489SN/A} 582489SN/A 592489SN/A 604762Snate@binkert.orgPioDevice::PioDevice(const Params *p) 614762Snate@binkert.org : MemObject(p), platform(p->platform), sys(p->system), pioPort(NULL) 624762Snate@binkert.org{} 634762Snate@binkert.org 64545SN/APioDevice::~PioDevice() 65545SN/A{ 662384SN/A if (pioPort) 672489SN/A delete pioPort; 68545SN/A} 69545SN/A 702542SN/Avoid 712541SN/APioDevice::init() 722541SN/A{ 732541SN/A if (!pioPort) 748674Snilay@cs.wisc.edu panic("Pio port of %s not connected to anything!", name()); 752541SN/A pioPort->sendStatusChange(Port::RangeChange); 762541SN/A} 772541SN/A 788598Ssteve.reinhardt@amd.comPort * 798598Ssteve.reinhardt@amd.comPioDevice::getPort(const std::string &if_name, int idx) 808598Ssteve.reinhardt@amd.com{ 818598Ssteve.reinhardt@amd.com if (if_name == "pio") { 828598Ssteve.reinhardt@amd.com if (pioPort != NULL) 838598Ssteve.reinhardt@amd.com fatal("%s: pio port already connected to %s", 848598Ssteve.reinhardt@amd.com name(), pioPort->getPeer()->name()); 858598Ssteve.reinhardt@amd.com pioPort = new PioPort(this, sys); 868598Ssteve.reinhardt@amd.com return pioPort; 878598Ssteve.reinhardt@amd.com } 888598Ssteve.reinhardt@amd.com return NULL; 898598Ssteve.reinhardt@amd.com} 902901Ssaidi@eecs.umich.edu 912901Ssaidi@eecs.umich.eduunsigned int 922901Ssaidi@eecs.umich.eduPioDevice::drain(Event *de) 932901Ssaidi@eecs.umich.edu{ 942901Ssaidi@eecs.umich.edu unsigned int count; 952901Ssaidi@eecs.umich.edu count = pioPort->drain(de); 962901Ssaidi@eecs.umich.edu if (count) 972901Ssaidi@eecs.umich.edu changeState(Draining); 982901Ssaidi@eecs.umich.edu else 992901Ssaidi@eecs.umich.edu changeState(Drained); 1002901Ssaidi@eecs.umich.edu return count; 1012901Ssaidi@eecs.umich.edu} 1022901Ssaidi@eecs.umich.edu 1034762Snate@binkert.orgBasicPioDevice::BasicPioDevice(const Params *p) 1044762Snate@binkert.org : PioDevice(p), pioAddr(p->pio_addr), pioSize(0), 1054762Snate@binkert.org pioDelay(p->pio_latency) 1064762Snate@binkert.org{} 1074762Snate@binkert.org 1082539SN/Avoid 1092539SN/ABasicPioDevice::addressRanges(AddrRangeList &range_list) 1102539SN/A{ 1112539SN/A assert(pioSize != 0); 1122539SN/A range_list.clear(); 1137729SAli.Saidi@ARM.com DPRINTF(BusAddrRanges, "registering range: %#x-%#x\n", pioAddr, pioSize); 1142539SN/A range_list.push_back(RangeSize(pioAddr, pioSize)); 1152539SN/A} 1162539SN/A 1172489SN/A 1188630SMitchell.Hayenga@ARM.comDmaPort::DmaPort(MemObject *dev, System *s, Tick min_backoff, Tick max_backoff, 1198630SMitchell.Hayenga@ARM.com bool recv_snoops) 1203401Sktlim@umich.edu : Port(dev->name() + "-dmaport", dev), device(dev), sys(s), 1214435Ssaidi@eecs.umich.edu pendingCount(0), actionInProgress(0), drainEvent(NULL), 1227403SAli.Saidi@ARM.com backoffTime(0), minBackoffDelay(min_backoff), 1238630SMitchell.Hayenga@ARM.com maxBackoffDelay(max_backoff), inRetry(false), recvSnoops(recv_snoops), 1248630SMitchell.Hayenga@ARM.com snoopRangeSent(false), backoffEvent(this) 1252489SN/A{ } 1262489SN/A 1272489SN/Abool 1283349Sbinkertn@umich.eduDmaPort::recvTiming(PacketPtr pkt) 1292384SN/A{ 1304870Sstever@eecs.umich.edu if (pkt->wasNacked()) { 1314739Sstever@eecs.umich.edu DPRINTF(DMA, "Received nacked %s addr %#x\n", 1324739Sstever@eecs.umich.edu pkt->cmdString(), pkt->getAddr()); 1334435Ssaidi@eecs.umich.edu 1347403SAli.Saidi@ARM.com if (backoffTime < minBackoffDelay) 1357403SAli.Saidi@ARM.com backoffTime = minBackoffDelay; 1367403SAli.Saidi@ARM.com else if (backoffTime < maxBackoffDelay) 1374435Ssaidi@eecs.umich.edu backoffTime <<= 1; 1384435Ssaidi@eecs.umich.edu 1397823Ssteve.reinhardt@amd.com reschedule(backoffEvent, curTick() + backoffTime, true); 1404435Ssaidi@eecs.umich.edu 1414435Ssaidi@eecs.umich.edu DPRINTF(DMA, "Backoff time set to %d ticks\n", backoffTime); 1424435Ssaidi@eecs.umich.edu 1432685Ssaidi@eecs.umich.edu pkt->reinitNacked(); 1444435Ssaidi@eecs.umich.edu queueDma(pkt, true); 1458642Ssaidi@eecs.umich.edu } else if (pkt->isRequest() && recvSnoops) { 1468642Ssaidi@eecs.umich.edu return true; 1472685Ssaidi@eecs.umich.edu } else if (pkt->senderState) { 1482565SN/A DmaReqState *state; 1494435Ssaidi@eecs.umich.edu backoffTime >>= 2; 1504435Ssaidi@eecs.umich.edu 1514739Sstever@eecs.umich.edu DPRINTF(DMA, "Received response %s addr %#x size %#x\n", 1524739Sstever@eecs.umich.edu pkt->cmdString(), pkt->getAddr(), pkt->req->getSize()); 1532641Sstever@eecs.umich.edu state = dynamic_cast<DmaReqState*>(pkt->senderState); 1542685Ssaidi@eecs.umich.edu pendingCount--; 1552685Ssaidi@eecs.umich.edu 1562685Ssaidi@eecs.umich.edu assert(pendingCount >= 0); 1572657Ssaidi@eecs.umich.edu assert(state); 1582685Ssaidi@eecs.umich.edu 1598134SAli.Saidi@ARM.com // We shouldn't ever get a block in ownership state 1608134SAli.Saidi@ARM.com assert(!(pkt->memInhibitAsserted() && !pkt->sharedAsserted())); 1618134SAli.Saidi@ARM.com 1622685Ssaidi@eecs.umich.edu state->numBytes += pkt->req->getSize(); 1634435Ssaidi@eecs.umich.edu assert(state->totBytes >= state->numBytes); 1642685Ssaidi@eecs.umich.edu if (state->totBytes == state->numBytes) { 1657403SAli.Saidi@ARM.com if (state->completionEvent) { 1667403SAli.Saidi@ARM.com if (state->delay) 1677823Ssteve.reinhardt@amd.com schedule(state->completionEvent, curTick() + state->delay); 1687403SAli.Saidi@ARM.com else 1697403SAli.Saidi@ARM.com state->completionEvent->process(); 1707403SAli.Saidi@ARM.com } 1712685Ssaidi@eecs.umich.edu delete state; 1722685Ssaidi@eecs.umich.edu } 1732630SN/A delete pkt->req; 1742630SN/A delete pkt; 1752901Ssaidi@eecs.umich.edu 1762901Ssaidi@eecs.umich.edu if (pendingCount == 0 && drainEvent) { 1772901Ssaidi@eecs.umich.edu drainEvent->process(); 1782901Ssaidi@eecs.umich.edu drainEvent = NULL; 1792901Ssaidi@eecs.umich.edu } 1802569SN/A } else { 1812685Ssaidi@eecs.umich.edu panic("Got packet without sender state... huh?\n"); 1822565SN/A } 1832569SN/A 1842657Ssaidi@eecs.umich.edu return true; 1852384SN/A} 186679SN/A 1874762Snate@binkert.orgDmaDevice::DmaDevice(const Params *p) 1887403SAli.Saidi@ARM.com : PioDevice(p), dmaPort(NULL) 1892565SN/A{ } 1902384SN/A 1912901Ssaidi@eecs.umich.edu 1922901Ssaidi@eecs.umich.eduunsigned int 1932901Ssaidi@eecs.umich.eduDmaDevice::drain(Event *de) 1942901Ssaidi@eecs.umich.edu{ 1952901Ssaidi@eecs.umich.edu unsigned int count; 1962901Ssaidi@eecs.umich.edu count = pioPort->drain(de) + dmaPort->drain(de); 1972901Ssaidi@eecs.umich.edu if (count) 1982901Ssaidi@eecs.umich.edu changeState(Draining); 1992901Ssaidi@eecs.umich.edu else 2002901Ssaidi@eecs.umich.edu changeState(Drained); 2012901Ssaidi@eecs.umich.edu return count; 2022901Ssaidi@eecs.umich.edu} 2032901Ssaidi@eecs.umich.edu 2042901Ssaidi@eecs.umich.eduunsigned int 2052901Ssaidi@eecs.umich.eduDmaPort::drain(Event *de) 2062901Ssaidi@eecs.umich.edu{ 2072901Ssaidi@eecs.umich.edu if (pendingCount == 0) 2082901Ssaidi@eecs.umich.edu return 0; 2092901Ssaidi@eecs.umich.edu drainEvent = de; 2102901Ssaidi@eecs.umich.edu return 1; 2112901Ssaidi@eecs.umich.edu} 2122901Ssaidi@eecs.umich.edu 2132901Ssaidi@eecs.umich.edu 2142384SN/Avoid 2152489SN/ADmaPort::recvRetry() 2162489SN/A{ 2174435Ssaidi@eecs.umich.edu assert(transmitList.size()); 2182659Ssaidi@eecs.umich.edu bool result = true; 2194435Ssaidi@eecs.umich.edu do { 2205539Scws3k@cs.virginia.edu PacketPtr pkt = transmitList.front(); 2214739Sstever@eecs.umich.edu DPRINTF(DMA, "Retry on %s addr %#x\n", 2224739Sstever@eecs.umich.edu pkt->cmdString(), pkt->getAddr()); 2232659Ssaidi@eecs.umich.edu result = sendTiming(pkt); 2242659Ssaidi@eecs.umich.edu if (result) { 2252659Ssaidi@eecs.umich.edu DPRINTF(DMA, "-- Done\n"); 2262659Ssaidi@eecs.umich.edu transmitList.pop_front(); 2274435Ssaidi@eecs.umich.edu inRetry = false; 2282659Ssaidi@eecs.umich.edu } else { 2294435Ssaidi@eecs.umich.edu inRetry = true; 2302659Ssaidi@eecs.umich.edu DPRINTF(DMA, "-- Failed, queued\n"); 2312659Ssaidi@eecs.umich.edu } 2324435Ssaidi@eecs.umich.edu } while (!backoffTime && result && transmitList.size()); 2334435Ssaidi@eecs.umich.edu 2344435Ssaidi@eecs.umich.edu if (transmitList.size() && backoffTime && !inRetry) { 2357823Ssteve.reinhardt@amd.com DPRINTF(DMA, "Scheduling backoff for %d\n", curTick()+backoffTime); 2364435Ssaidi@eecs.umich.edu if (!backoffEvent.scheduled()) 2377823Ssteve.reinhardt@amd.com schedule(backoffEvent, backoffTime + curTick()); 2382657Ssaidi@eecs.umich.edu } 2394435Ssaidi@eecs.umich.edu DPRINTF(DMA, "TransmitList: %d, backoffTime: %d inRetry: %d es: %d\n", 2404435Ssaidi@eecs.umich.edu transmitList.size(), backoffTime, inRetry, 2414435Ssaidi@eecs.umich.edu backoffEvent.scheduled()); 2422489SN/A} 2432641Sstever@eecs.umich.edu 2442641Sstever@eecs.umich.edu 2452489SN/Avoid 2462641Sstever@eecs.umich.eduDmaPort::dmaAction(Packet::Command cmd, Addr addr, int size, Event *event, 2477607SGene.Wu@arm.com uint8_t *data, Tick delay, Request::Flags flag) 2482384SN/A{ 2492901Ssaidi@eecs.umich.edu assert(device->getState() == SimObject::Running); 2502901Ssaidi@eecs.umich.edu 2515534Ssaidi@eecs.umich.edu DmaReqState *reqState = new DmaReqState(event, this, size, delay); 2522384SN/A 2534451Ssaidi@eecs.umich.edu 2544451Ssaidi@eecs.umich.edu DPRINTF(DMA, "Starting DMA for addr: %#x size: %d sched: %d\n", addr, size, 2557607SGene.Wu@arm.com event ? event->scheduled() : -1 ); 2562406SN/A for (ChunkGenerator gen(addr, size, peerBlockSize()); 2572406SN/A !gen.done(); gen.next()) { 2587607SGene.Wu@arm.com Request *req = new Request(gen.addr(), gen.size(), flag); 2593349Sbinkertn@umich.edu PacketPtr pkt = new Packet(req, cmd, Packet::Broadcast); 2602641Sstever@eecs.umich.edu 2612384SN/A // Increment the data pointer on a write 2622566SN/A if (data) 2632685Ssaidi@eecs.umich.edu pkt->dataStatic(data + gen.complete()); 2642641Sstever@eecs.umich.edu 2652685Ssaidi@eecs.umich.edu pkt->senderState = reqState; 2662641Sstever@eecs.umich.edu 2672565SN/A assert(pendingCount >= 0); 2682565SN/A pendingCount++; 2694451Ssaidi@eecs.umich.edu DPRINTF(DMA, "--Queuing DMA for addr: %#x size: %d\n", gen.addr(), 2704451Ssaidi@eecs.umich.edu gen.size()); 2714435Ssaidi@eecs.umich.edu queueDma(pkt); 2722384SN/A } 2732901Ssaidi@eecs.umich.edu 2742384SN/A} 2752384SN/A 2764435Ssaidi@eecs.umich.eduvoid 2774435Ssaidi@eecs.umich.eduDmaPort::queueDma(PacketPtr pkt, bool front) 2784435Ssaidi@eecs.umich.edu{ 2794435Ssaidi@eecs.umich.edu 2804435Ssaidi@eecs.umich.edu if (front) 2814435Ssaidi@eecs.umich.edu transmitList.push_front(pkt); 2824435Ssaidi@eecs.umich.edu else 2834435Ssaidi@eecs.umich.edu transmitList.push_back(pkt); 2844435Ssaidi@eecs.umich.edu sendDma(); 2854435Ssaidi@eecs.umich.edu} 2864435Ssaidi@eecs.umich.edu 2872384SN/A 2882384SN/Avoid 2894435Ssaidi@eecs.umich.eduDmaPort::sendDma() 2902384SN/A{ 2912901Ssaidi@eecs.umich.edu // some kind of selction between access methods 2922901Ssaidi@eecs.umich.edu // more work is going to have to be done to make 2932901Ssaidi@eecs.umich.edu // switching actually work 2944435Ssaidi@eecs.umich.edu assert(transmitList.size()); 2954435Ssaidi@eecs.umich.edu PacketPtr pkt = transmitList.front(); 2962902Ssaidi@eecs.umich.edu 2974762Snate@binkert.org Enums::MemoryMode state = sys->getMemoryMode(); 2984762Snate@binkert.org if (state == Enums::timing) { 2994435Ssaidi@eecs.umich.edu if (backoffEvent.scheduled() || inRetry) { 3004435Ssaidi@eecs.umich.edu DPRINTF(DMA, "Can't send immediately, waiting for retry or backoff timer\n"); 3014435Ssaidi@eecs.umich.edu return; 3024435Ssaidi@eecs.umich.edu } 3034435Ssaidi@eecs.umich.edu 3044739Sstever@eecs.umich.edu DPRINTF(DMA, "Attempting to send %s addr %#x\n", 3054739Sstever@eecs.umich.edu pkt->cmdString(), pkt->getAddr()); 3064435Ssaidi@eecs.umich.edu 3074435Ssaidi@eecs.umich.edu bool result; 3084435Ssaidi@eecs.umich.edu do { 3094435Ssaidi@eecs.umich.edu result = sendTiming(pkt); 3104435Ssaidi@eecs.umich.edu if (result) { 3114435Ssaidi@eecs.umich.edu transmitList.pop_front(); 3124435Ssaidi@eecs.umich.edu DPRINTF(DMA, "-- Done\n"); 3134435Ssaidi@eecs.umich.edu } else { 3144435Ssaidi@eecs.umich.edu inRetry = true; 3154435Ssaidi@eecs.umich.edu DPRINTF(DMA, "-- Failed: queued\n"); 3164435Ssaidi@eecs.umich.edu } 3174435Ssaidi@eecs.umich.edu } while (result && !backoffTime && transmitList.size()); 3184435Ssaidi@eecs.umich.edu 3194435Ssaidi@eecs.umich.edu if (transmitList.size() && backoffTime && !inRetry && 3204435Ssaidi@eecs.umich.edu !backoffEvent.scheduled()) { 3214451Ssaidi@eecs.umich.edu DPRINTF(DMA, "-- Scheduling backoff timer for %d\n", 3227823Ssteve.reinhardt@amd.com backoffTime+curTick()); 3237823Ssteve.reinhardt@amd.com schedule(backoffEvent, backoffTime + curTick()); 3242901Ssaidi@eecs.umich.edu } 3254762Snate@binkert.org } else if (state == Enums::atomic) { 3264435Ssaidi@eecs.umich.edu transmitList.pop_front(); 3274435Ssaidi@eecs.umich.edu 3282902Ssaidi@eecs.umich.edu Tick lat; 3294451Ssaidi@eecs.umich.edu DPRINTF(DMA, "--Sending DMA for addr: %#x size: %d\n", 3304451Ssaidi@eecs.umich.edu pkt->req->getPaddr(), pkt->req->getSize()); 3312902Ssaidi@eecs.umich.edu lat = sendAtomic(pkt); 3322901Ssaidi@eecs.umich.edu assert(pkt->senderState); 3332901Ssaidi@eecs.umich.edu DmaReqState *state = dynamic_cast<DmaReqState*>(pkt->senderState); 3342901Ssaidi@eecs.umich.edu assert(state); 3354451Ssaidi@eecs.umich.edu state->numBytes += pkt->req->getSize(); 3362384SN/A 3374451Ssaidi@eecs.umich.edu DPRINTF(DMA, "--Received response for DMA for addr: %#x size: %d nb: %d, tot: %d sched %d\n", 3384451Ssaidi@eecs.umich.edu pkt->req->getPaddr(), pkt->req->getSize(), state->numBytes, 3397403SAli.Saidi@ARM.com state->totBytes, 3407403SAli.Saidi@ARM.com state->completionEvent ? state->completionEvent->scheduled() : 0 ); 3414451Ssaidi@eecs.umich.edu 3422901Ssaidi@eecs.umich.edu if (state->totBytes == state->numBytes) { 3437403SAli.Saidi@ARM.com if (state->completionEvent) { 3447403SAli.Saidi@ARM.com assert(!state->completionEvent->scheduled()); 3457823Ssteve.reinhardt@amd.com schedule(state->completionEvent, curTick() + lat + state->delay); 3467403SAli.Saidi@ARM.com } 3472901Ssaidi@eecs.umich.edu delete state; 3482901Ssaidi@eecs.umich.edu delete pkt->req; 3492901Ssaidi@eecs.umich.edu } 3502901Ssaidi@eecs.umich.edu pendingCount--; 3512901Ssaidi@eecs.umich.edu assert(pendingCount >= 0); 3522901Ssaidi@eecs.umich.edu delete pkt; 3532566SN/A 3542901Ssaidi@eecs.umich.edu if (pendingCount == 0 && drainEvent) { 3552901Ssaidi@eecs.umich.edu drainEvent->process(); 3562901Ssaidi@eecs.umich.edu drainEvent = NULL; 3572901Ssaidi@eecs.umich.edu } 3582901Ssaidi@eecs.umich.edu 3592384SN/A } else 3602384SN/A panic("Unknown memory command state."); 3612384SN/A} 362545SN/A 363545SN/ADmaDevice::~DmaDevice() 364545SN/A{ 3652489SN/A if (dmaPort) 3662489SN/A delete dmaPort; 367545SN/A} 3688598Ssteve.reinhardt@amd.com 3698598Ssteve.reinhardt@amd.com 3708598Ssteve.reinhardt@amd.comPort * 3718598Ssteve.reinhardt@amd.comDmaDevice::getPort(const std::string &if_name, int idx) 3728598Ssteve.reinhardt@amd.com{ 3738598Ssteve.reinhardt@amd.com if (if_name == "dma") { 3748598Ssteve.reinhardt@amd.com if (dmaPort != NULL) 3758598Ssteve.reinhardt@amd.com fatal("%s: dma port already connected to %s", 3768598Ssteve.reinhardt@amd.com name(), dmaPort->getPeer()->name()); 3778598Ssteve.reinhardt@amd.com dmaPort = new DmaPort(this, sys, params()->min_backoff_delay, 3788598Ssteve.reinhardt@amd.com params()->max_backoff_delay); 3798598Ssteve.reinhardt@amd.com return dmaPort; 3808598Ssteve.reinhardt@amd.com } 3818598Ssteve.reinhardt@amd.com return PioDevice::getPort(if_name, idx); 3828598Ssteve.reinhardt@amd.com} 3838598Ssteve.reinhardt@amd.com 384