io_device.cc revision 8630
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) 742541SN/A panic("Pio port not connected to anything!"); 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); 1452685Ssaidi@eecs.umich.edu } else if (pkt->senderState) { 1468630SMitchell.Hayenga@ARM.com if (recvSnoops) { 1478630SMitchell.Hayenga@ARM.com if (pkt->isRequest()) { 1488630SMitchell.Hayenga@ARM.com return true; 1498630SMitchell.Hayenga@ARM.com } 1508630SMitchell.Hayenga@ARM.com } 1518630SMitchell.Hayenga@ARM.com 1522565SN/A DmaReqState *state; 1534435Ssaidi@eecs.umich.edu backoffTime >>= 2; 1544435Ssaidi@eecs.umich.edu 1554739Sstever@eecs.umich.edu DPRINTF(DMA, "Received response %s addr %#x size %#x\n", 1564739Sstever@eecs.umich.edu pkt->cmdString(), pkt->getAddr(), pkt->req->getSize()); 1572641Sstever@eecs.umich.edu state = dynamic_cast<DmaReqState*>(pkt->senderState); 1582685Ssaidi@eecs.umich.edu pendingCount--; 1592685Ssaidi@eecs.umich.edu 1602685Ssaidi@eecs.umich.edu assert(pendingCount >= 0); 1612657Ssaidi@eecs.umich.edu assert(state); 1622685Ssaidi@eecs.umich.edu 1638134SAli.Saidi@ARM.com // We shouldn't ever get a block in ownership state 1648134SAli.Saidi@ARM.com assert(!(pkt->memInhibitAsserted() && !pkt->sharedAsserted())); 1658134SAli.Saidi@ARM.com 1662685Ssaidi@eecs.umich.edu state->numBytes += pkt->req->getSize(); 1674435Ssaidi@eecs.umich.edu assert(state->totBytes >= state->numBytes); 1682685Ssaidi@eecs.umich.edu if (state->totBytes == state->numBytes) { 1697403SAli.Saidi@ARM.com if (state->completionEvent) { 1707403SAli.Saidi@ARM.com if (state->delay) 1717823Ssteve.reinhardt@amd.com schedule(state->completionEvent, curTick() + state->delay); 1727403SAli.Saidi@ARM.com else 1737403SAli.Saidi@ARM.com state->completionEvent->process(); 1747403SAli.Saidi@ARM.com } 1752685Ssaidi@eecs.umich.edu delete state; 1762685Ssaidi@eecs.umich.edu } 1772630SN/A delete pkt->req; 1782630SN/A delete pkt; 1792901Ssaidi@eecs.umich.edu 1802901Ssaidi@eecs.umich.edu if (pendingCount == 0 && drainEvent) { 1812901Ssaidi@eecs.umich.edu drainEvent->process(); 1822901Ssaidi@eecs.umich.edu drainEvent = NULL; 1832901Ssaidi@eecs.umich.edu } 1842569SN/A } else { 1852685Ssaidi@eecs.umich.edu panic("Got packet without sender state... huh?\n"); 1862565SN/A } 1872569SN/A 1882657Ssaidi@eecs.umich.edu return true; 1892384SN/A} 190679SN/A 1914762Snate@binkert.orgDmaDevice::DmaDevice(const Params *p) 1927403SAli.Saidi@ARM.com : PioDevice(p), dmaPort(NULL) 1932565SN/A{ } 1942384SN/A 1952901Ssaidi@eecs.umich.edu 1962901Ssaidi@eecs.umich.eduunsigned int 1972901Ssaidi@eecs.umich.eduDmaDevice::drain(Event *de) 1982901Ssaidi@eecs.umich.edu{ 1992901Ssaidi@eecs.umich.edu unsigned int count; 2002901Ssaidi@eecs.umich.edu count = pioPort->drain(de) + dmaPort->drain(de); 2012901Ssaidi@eecs.umich.edu if (count) 2022901Ssaidi@eecs.umich.edu changeState(Draining); 2032901Ssaidi@eecs.umich.edu else 2042901Ssaidi@eecs.umich.edu changeState(Drained); 2052901Ssaidi@eecs.umich.edu return count; 2062901Ssaidi@eecs.umich.edu} 2072901Ssaidi@eecs.umich.edu 2082901Ssaidi@eecs.umich.eduunsigned int 2092901Ssaidi@eecs.umich.eduDmaPort::drain(Event *de) 2102901Ssaidi@eecs.umich.edu{ 2112901Ssaidi@eecs.umich.edu if (pendingCount == 0) 2122901Ssaidi@eecs.umich.edu return 0; 2132901Ssaidi@eecs.umich.edu drainEvent = de; 2142901Ssaidi@eecs.umich.edu return 1; 2152901Ssaidi@eecs.umich.edu} 2162901Ssaidi@eecs.umich.edu 2172901Ssaidi@eecs.umich.edu 2182384SN/Avoid 2192489SN/ADmaPort::recvRetry() 2202489SN/A{ 2214435Ssaidi@eecs.umich.edu assert(transmitList.size()); 2222659Ssaidi@eecs.umich.edu bool result = true; 2234435Ssaidi@eecs.umich.edu do { 2245539Scws3k@cs.virginia.edu PacketPtr pkt = transmitList.front(); 2254739Sstever@eecs.umich.edu DPRINTF(DMA, "Retry on %s addr %#x\n", 2264739Sstever@eecs.umich.edu pkt->cmdString(), pkt->getAddr()); 2272659Ssaidi@eecs.umich.edu result = sendTiming(pkt); 2282659Ssaidi@eecs.umich.edu if (result) { 2292659Ssaidi@eecs.umich.edu DPRINTF(DMA, "-- Done\n"); 2302659Ssaidi@eecs.umich.edu transmitList.pop_front(); 2314435Ssaidi@eecs.umich.edu inRetry = false; 2322659Ssaidi@eecs.umich.edu } else { 2334435Ssaidi@eecs.umich.edu inRetry = true; 2342659Ssaidi@eecs.umich.edu DPRINTF(DMA, "-- Failed, queued\n"); 2352659Ssaidi@eecs.umich.edu } 2364435Ssaidi@eecs.umich.edu } while (!backoffTime && result && transmitList.size()); 2374435Ssaidi@eecs.umich.edu 2384435Ssaidi@eecs.umich.edu if (transmitList.size() && backoffTime && !inRetry) { 2397823Ssteve.reinhardt@amd.com DPRINTF(DMA, "Scheduling backoff for %d\n", curTick()+backoffTime); 2404435Ssaidi@eecs.umich.edu if (!backoffEvent.scheduled()) 2417823Ssteve.reinhardt@amd.com schedule(backoffEvent, backoffTime + curTick()); 2422657Ssaidi@eecs.umich.edu } 2434435Ssaidi@eecs.umich.edu DPRINTF(DMA, "TransmitList: %d, backoffTime: %d inRetry: %d es: %d\n", 2444435Ssaidi@eecs.umich.edu transmitList.size(), backoffTime, inRetry, 2454435Ssaidi@eecs.umich.edu backoffEvent.scheduled()); 2462489SN/A} 2472641Sstever@eecs.umich.edu 2482641Sstever@eecs.umich.edu 2492489SN/Avoid 2502641Sstever@eecs.umich.eduDmaPort::dmaAction(Packet::Command cmd, Addr addr, int size, Event *event, 2517607SGene.Wu@arm.com uint8_t *data, Tick delay, Request::Flags flag) 2522384SN/A{ 2532901Ssaidi@eecs.umich.edu assert(device->getState() == SimObject::Running); 2542901Ssaidi@eecs.umich.edu 2555534Ssaidi@eecs.umich.edu DmaReqState *reqState = new DmaReqState(event, this, size, delay); 2562384SN/A 2574451Ssaidi@eecs.umich.edu 2584451Ssaidi@eecs.umich.edu DPRINTF(DMA, "Starting DMA for addr: %#x size: %d sched: %d\n", addr, size, 2597607SGene.Wu@arm.com event ? event->scheduled() : -1 ); 2602406SN/A for (ChunkGenerator gen(addr, size, peerBlockSize()); 2612406SN/A !gen.done(); gen.next()) { 2627607SGene.Wu@arm.com Request *req = new Request(gen.addr(), gen.size(), flag); 2633349Sbinkertn@umich.edu PacketPtr pkt = new Packet(req, cmd, Packet::Broadcast); 2642641Sstever@eecs.umich.edu 2652384SN/A // Increment the data pointer on a write 2662566SN/A if (data) 2672685Ssaidi@eecs.umich.edu pkt->dataStatic(data + gen.complete()); 2682641Sstever@eecs.umich.edu 2692685Ssaidi@eecs.umich.edu pkt->senderState = reqState; 2702641Sstever@eecs.umich.edu 2712565SN/A assert(pendingCount >= 0); 2722565SN/A pendingCount++; 2734451Ssaidi@eecs.umich.edu DPRINTF(DMA, "--Queuing DMA for addr: %#x size: %d\n", gen.addr(), 2744451Ssaidi@eecs.umich.edu gen.size()); 2754435Ssaidi@eecs.umich.edu queueDma(pkt); 2762384SN/A } 2772901Ssaidi@eecs.umich.edu 2782384SN/A} 2792384SN/A 2804435Ssaidi@eecs.umich.eduvoid 2814435Ssaidi@eecs.umich.eduDmaPort::queueDma(PacketPtr pkt, bool front) 2824435Ssaidi@eecs.umich.edu{ 2834435Ssaidi@eecs.umich.edu 2844435Ssaidi@eecs.umich.edu if (front) 2854435Ssaidi@eecs.umich.edu transmitList.push_front(pkt); 2864435Ssaidi@eecs.umich.edu else 2874435Ssaidi@eecs.umich.edu transmitList.push_back(pkt); 2884435Ssaidi@eecs.umich.edu sendDma(); 2894435Ssaidi@eecs.umich.edu} 2904435Ssaidi@eecs.umich.edu 2912384SN/A 2922384SN/Avoid 2934435Ssaidi@eecs.umich.eduDmaPort::sendDma() 2942384SN/A{ 2952901Ssaidi@eecs.umich.edu // some kind of selction between access methods 2962901Ssaidi@eecs.umich.edu // more work is going to have to be done to make 2972901Ssaidi@eecs.umich.edu // switching actually work 2984435Ssaidi@eecs.umich.edu assert(transmitList.size()); 2994435Ssaidi@eecs.umich.edu PacketPtr pkt = transmitList.front(); 3002902Ssaidi@eecs.umich.edu 3014762Snate@binkert.org Enums::MemoryMode state = sys->getMemoryMode(); 3024762Snate@binkert.org if (state == Enums::timing) { 3034435Ssaidi@eecs.umich.edu if (backoffEvent.scheduled() || inRetry) { 3044435Ssaidi@eecs.umich.edu DPRINTF(DMA, "Can't send immediately, waiting for retry or backoff timer\n"); 3054435Ssaidi@eecs.umich.edu return; 3064435Ssaidi@eecs.umich.edu } 3074435Ssaidi@eecs.umich.edu 3084739Sstever@eecs.umich.edu DPRINTF(DMA, "Attempting to send %s addr %#x\n", 3094739Sstever@eecs.umich.edu pkt->cmdString(), pkt->getAddr()); 3104435Ssaidi@eecs.umich.edu 3114435Ssaidi@eecs.umich.edu bool result; 3124435Ssaidi@eecs.umich.edu do { 3134435Ssaidi@eecs.umich.edu result = sendTiming(pkt); 3144435Ssaidi@eecs.umich.edu if (result) { 3154435Ssaidi@eecs.umich.edu transmitList.pop_front(); 3164435Ssaidi@eecs.umich.edu DPRINTF(DMA, "-- Done\n"); 3174435Ssaidi@eecs.umich.edu } else { 3184435Ssaidi@eecs.umich.edu inRetry = true; 3194435Ssaidi@eecs.umich.edu DPRINTF(DMA, "-- Failed: queued\n"); 3204435Ssaidi@eecs.umich.edu } 3214435Ssaidi@eecs.umich.edu } while (result && !backoffTime && transmitList.size()); 3224435Ssaidi@eecs.umich.edu 3234435Ssaidi@eecs.umich.edu if (transmitList.size() && backoffTime && !inRetry && 3244435Ssaidi@eecs.umich.edu !backoffEvent.scheduled()) { 3254451Ssaidi@eecs.umich.edu DPRINTF(DMA, "-- Scheduling backoff timer for %d\n", 3267823Ssteve.reinhardt@amd.com backoffTime+curTick()); 3277823Ssteve.reinhardt@amd.com schedule(backoffEvent, backoffTime + curTick()); 3282901Ssaidi@eecs.umich.edu } 3294762Snate@binkert.org } else if (state == Enums::atomic) { 3304435Ssaidi@eecs.umich.edu transmitList.pop_front(); 3314435Ssaidi@eecs.umich.edu 3322902Ssaidi@eecs.umich.edu Tick lat; 3334451Ssaidi@eecs.umich.edu DPRINTF(DMA, "--Sending DMA for addr: %#x size: %d\n", 3344451Ssaidi@eecs.umich.edu pkt->req->getPaddr(), pkt->req->getSize()); 3352902Ssaidi@eecs.umich.edu lat = sendAtomic(pkt); 3362901Ssaidi@eecs.umich.edu assert(pkt->senderState); 3372901Ssaidi@eecs.umich.edu DmaReqState *state = dynamic_cast<DmaReqState*>(pkt->senderState); 3382901Ssaidi@eecs.umich.edu assert(state); 3394451Ssaidi@eecs.umich.edu state->numBytes += pkt->req->getSize(); 3402384SN/A 3414451Ssaidi@eecs.umich.edu DPRINTF(DMA, "--Received response for DMA for addr: %#x size: %d nb: %d, tot: %d sched %d\n", 3424451Ssaidi@eecs.umich.edu pkt->req->getPaddr(), pkt->req->getSize(), state->numBytes, 3437403SAli.Saidi@ARM.com state->totBytes, 3447403SAli.Saidi@ARM.com state->completionEvent ? state->completionEvent->scheduled() : 0 ); 3454451Ssaidi@eecs.umich.edu 3462901Ssaidi@eecs.umich.edu if (state->totBytes == state->numBytes) { 3477403SAli.Saidi@ARM.com if (state->completionEvent) { 3487403SAli.Saidi@ARM.com assert(!state->completionEvent->scheduled()); 3497823Ssteve.reinhardt@amd.com schedule(state->completionEvent, curTick() + lat + state->delay); 3507403SAli.Saidi@ARM.com } 3512901Ssaidi@eecs.umich.edu delete state; 3522901Ssaidi@eecs.umich.edu delete pkt->req; 3532901Ssaidi@eecs.umich.edu } 3542901Ssaidi@eecs.umich.edu pendingCount--; 3552901Ssaidi@eecs.umich.edu assert(pendingCount >= 0); 3562901Ssaidi@eecs.umich.edu delete pkt; 3572566SN/A 3582901Ssaidi@eecs.umich.edu if (pendingCount == 0 && drainEvent) { 3592901Ssaidi@eecs.umich.edu drainEvent->process(); 3602901Ssaidi@eecs.umich.edu drainEvent = NULL; 3612901Ssaidi@eecs.umich.edu } 3622901Ssaidi@eecs.umich.edu 3632384SN/A } else 3642384SN/A panic("Unknown memory command state."); 3652384SN/A} 366545SN/A 367545SN/ADmaDevice::~DmaDevice() 368545SN/A{ 3692489SN/A if (dmaPort) 3702489SN/A delete dmaPort; 371545SN/A} 3728598Ssteve.reinhardt@amd.com 3738598Ssteve.reinhardt@amd.com 3748598Ssteve.reinhardt@amd.comPort * 3758598Ssteve.reinhardt@amd.comDmaDevice::getPort(const std::string &if_name, int idx) 3768598Ssteve.reinhardt@amd.com{ 3778598Ssteve.reinhardt@amd.com if (if_name == "dma") { 3788598Ssteve.reinhardt@amd.com if (dmaPort != NULL) 3798598Ssteve.reinhardt@amd.com fatal("%s: dma port already connected to %s", 3808598Ssteve.reinhardt@amd.com name(), dmaPort->getPeer()->name()); 3818598Ssteve.reinhardt@amd.com dmaPort = new DmaPort(this, sys, params()->min_backoff_delay, 3828598Ssteve.reinhardt@amd.com params()->max_backoff_delay); 3838598Ssteve.reinhardt@amd.com return dmaPort; 3848598Ssteve.reinhardt@amd.com } 3858598Ssteve.reinhardt@amd.com return PioDevice::getPort(if_name, idx); 3868598Ssteve.reinhardt@amd.com} 3878598Ssteve.reinhardt@amd.com 388