io_device.cc revision 4475
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 322657Ssaidi@eecs.umich.edu#include "base/chunk_generator.hh" 33545SN/A#include "base/trace.hh" 34679SN/A#include "dev/io_device.hh" 352901Ssaidi@eecs.umich.edu#include "sim/builder.hh" 36545SN/A#include "sim/system.hh" 372489SN/A 382901Ssaidi@eecs.umich.edu 392914Ssaidi@eecs.umich.eduPioPort::PioPort(PioDevice *dev, System *s, std::string pname) 402489SN/A : SimpleTimingPort(dev->name() + pname, dev), device(dev) 412489SN/A{ } 422489SN/A 432489SN/A 442630SN/ATick 452489SN/APioPort::recvAtomic(PacketPtr pkt) 462489SN/A{ 472489SN/A return pkt->isRead() ? device->read(pkt) : device->write(pkt); 482489SN/A} 492489SN/A 502630SN/Avoid 512489SN/APioPort::getDeviceAddressRanges(AddrRangeList &resp, bool &snoop) 522489SN/A{ 532489SN/A snoop = false; 542489SN/A device->addressRanges(resp); 552489SN/A} 562521SN/A 572489SN/A 582521SN/APioDevice::~PioDevice() 592521SN/A{ 602489SN/A if (pioPort) 612489SN/A delete pioPort; 622489SN/A} 632384SN/A 642630SN/Avoid 652384SN/APioDevice::init() 662784Ssaidi@eecs.umich.edu{ 672846Ssaidi@eecs.umich.edu if (!pioPort) 682784Ssaidi@eecs.umich.edu panic("Pio port not connected to anything!"); 692784Ssaidi@eecs.umich.edu pioPort->sendStatusChange(Port::RangeChange); 702784Ssaidi@eecs.umich.edu} 712784Ssaidi@eecs.umich.edu 722784Ssaidi@eecs.umich.edu 732784Ssaidi@eecs.umich.eduunsigned int 742641Sstever@eecs.umich.eduPioDevice::drain(Event *de) 752384SN/A{ 76545SN/A unsigned int count; 77545SN/A count = pioPort->drain(de); 78545SN/A if (count) 792384SN/A changeState(Draining); 802489SN/A else 81545SN/A changeState(Drained); 82545SN/A return count; 832542SN/A} 842541SN/A 852541SN/Avoid 862541SN/ABasicPioDevice::addressRanges(AddrRangeList &range_list) 872541SN/A{ 882541SN/A assert(pioSize != 0); 892541SN/A range_list.clear(); 902541SN/A range_list.push_back(RangeSize(pioAddr, pioSize)); 912901Ssaidi@eecs.umich.edu} 922901Ssaidi@eecs.umich.edu 932901Ssaidi@eecs.umich.edu 942901Ssaidi@eecs.umich.eduDmaPort::DmaPort(DmaDevice *dev, System *s) 952901Ssaidi@eecs.umich.edu : Port(dev->name() + "-dmaport", dev), device(dev), sys(s), 962901Ssaidi@eecs.umich.edu pendingCount(0), actionInProgress(0), drainEvent(NULL), 972901Ssaidi@eecs.umich.edu backoffTime(0), inRetry(false), backoffEvent(this) 982901Ssaidi@eecs.umich.edu{ } 992901Ssaidi@eecs.umich.edu 1002901Ssaidi@eecs.umich.edubool 1012901Ssaidi@eecs.umich.eduDmaPort::recvTiming(PacketPtr pkt) 1022901Ssaidi@eecs.umich.edu{ 1032901Ssaidi@eecs.umich.edu 1042539SN/A 1052539SN/A if (pkt->result == Packet::Nacked) { 1062539SN/A DPRINTF(DMA, "Received nacked Pkt %#x with State: %#x Addr: %#x\n", 1072539SN/A pkt, pkt->senderState, pkt->getAddr()); 1082539SN/A 1092539SN/A if (backoffTime < device->minBackoffDelay) 1102539SN/A backoffTime = device->minBackoffDelay; 1112539SN/A else if (backoffTime < device->maxBackoffDelay) 1122489SN/A backoffTime <<= 1; 1132901Ssaidi@eecs.umich.edu 1142901Ssaidi@eecs.umich.edu backoffEvent.reschedule(curTick + backoffTime, true); 1152901Ssaidi@eecs.umich.edu 1162489SN/A DPRINTF(DMA, "Backoff time set to %d ticks\n", backoffTime); 1172489SN/A 1182489SN/A pkt->reinitNacked(); 1192630SN/A queueDma(pkt, true); 1202384SN/A } else if (pkt->senderState) { 1212685Ssaidi@eecs.umich.edu DmaReqState *state; 1222685Ssaidi@eecs.umich.edu backoffTime >>= 2; 1232685Ssaidi@eecs.umich.edu 1242685Ssaidi@eecs.umich.edu DPRINTF(DMA, "Received response Pkt %#x with State: %#x Addr: %#x size: %#x\n", 1252685Ssaidi@eecs.umich.edu pkt, pkt->senderState, pkt->getAddr(), pkt->req->getSize()); 1262685Ssaidi@eecs.umich.edu state = dynamic_cast<DmaReqState*>(pkt->senderState); 1272685Ssaidi@eecs.umich.edu pendingCount--; 1282685Ssaidi@eecs.umich.edu 1292565SN/A assert(pendingCount >= 0); 1302685Ssaidi@eecs.umich.edu assert(state); 1312685Ssaidi@eecs.umich.edu 1322641Sstever@eecs.umich.edu state->numBytes += pkt->req->getSize(); 1332685Ssaidi@eecs.umich.edu assert(state->totBytes >= state->numBytes); 1342685Ssaidi@eecs.umich.edu if (state->totBytes == state->numBytes) { 1352685Ssaidi@eecs.umich.edu state->completionEvent->process(); 1362657Ssaidi@eecs.umich.edu delete state; 1372685Ssaidi@eecs.umich.edu } 1382685Ssaidi@eecs.umich.edu delete pkt->req; 1392685Ssaidi@eecs.umich.edu delete pkt; 1402685Ssaidi@eecs.umich.edu 1412685Ssaidi@eecs.umich.edu if (pendingCount == 0 && drainEvent) { 1422685Ssaidi@eecs.umich.edu drainEvent->process(); 1432630SN/A drainEvent = NULL; 1442630SN/A } 1452901Ssaidi@eecs.umich.edu } else { 1462901Ssaidi@eecs.umich.edu panic("Got packet without sender state... huh?\n"); 1472901Ssaidi@eecs.umich.edu } 1482901Ssaidi@eecs.umich.edu 1492901Ssaidi@eecs.umich.edu return true; 1502569SN/A} 1512685Ssaidi@eecs.umich.edu 1522565SN/ADmaDevice::DmaDevice(Params *p) 1532569SN/A : PioDevice(p), dmaPort(NULL), minBackoffDelay(p->min_backoff_delay), 1542657Ssaidi@eecs.umich.edu maxBackoffDelay(p->max_backoff_delay) 1552384SN/A{ } 156679SN/A 1572521SN/A 1582565SN/Aunsigned int 1592565SN/ADmaDevice::drain(Event *de) 1602384SN/A{ 1612901Ssaidi@eecs.umich.edu unsigned int count; 1622901Ssaidi@eecs.umich.edu count = pioPort->drain(de) + dmaPort->drain(de); 1632901Ssaidi@eecs.umich.edu if (count) 1642901Ssaidi@eecs.umich.edu changeState(Draining); 1652901Ssaidi@eecs.umich.edu else 1662901Ssaidi@eecs.umich.edu changeState(Drained); 1672901Ssaidi@eecs.umich.edu return count; 1682901Ssaidi@eecs.umich.edu} 1692901Ssaidi@eecs.umich.edu 1702901Ssaidi@eecs.umich.eduunsigned int 1712901Ssaidi@eecs.umich.eduDmaPort::drain(Event *de) 1722901Ssaidi@eecs.umich.edu{ 1732901Ssaidi@eecs.umich.edu if (pendingCount == 0) 1742901Ssaidi@eecs.umich.edu return 0; 1752901Ssaidi@eecs.umich.edu drainEvent = de; 1762901Ssaidi@eecs.umich.edu return 1; 1772901Ssaidi@eecs.umich.edu} 1782901Ssaidi@eecs.umich.edu 1792901Ssaidi@eecs.umich.edu 1802901Ssaidi@eecs.umich.eduvoid 1812901Ssaidi@eecs.umich.eduDmaPort::recvRetry() 1822901Ssaidi@eecs.umich.edu{ 1832901Ssaidi@eecs.umich.edu assert(transmitList.size()); 1842384SN/A PacketPtr pkt = transmitList.front(); 1852489SN/A bool result = true; 1862489SN/A do { 1872489SN/A DPRINTF(DMA, "Retry on Packet %#x with senderState: %#x\n", 1882659Ssaidi@eecs.umich.edu pkt, pkt->senderState); 1892659Ssaidi@eecs.umich.edu result = sendTiming(pkt); 1902659Ssaidi@eecs.umich.edu if (result) { 1912659Ssaidi@eecs.umich.edu DPRINTF(DMA, "-- Done\n"); 1922659Ssaidi@eecs.umich.edu transmitList.pop_front(); 1932659Ssaidi@eecs.umich.edu inRetry = false; 1942659Ssaidi@eecs.umich.edu } else { 1952659Ssaidi@eecs.umich.edu inRetry = true; 1962659Ssaidi@eecs.umich.edu DPRINTF(DMA, "-- Failed, queued\n"); 1972659Ssaidi@eecs.umich.edu } 1982659Ssaidi@eecs.umich.edu } while (!backoffTime && result && transmitList.size()); 1992657Ssaidi@eecs.umich.edu 2002489SN/A if (transmitList.size() && backoffTime && !inRetry) { 2012641Sstever@eecs.umich.edu DPRINTF(DMA, "Scheduling backoff for %d\n", curTick+backoffTime); 2022641Sstever@eecs.umich.edu if (!backoffEvent.scheduled()) 2032489SN/A backoffEvent.schedule(backoffTime+curTick); 2042641Sstever@eecs.umich.edu } 2052641Sstever@eecs.umich.edu DPRINTF(DMA, "TransmitList: %d, backoffTime: %d inRetry: %d es: %d\n", 2062384SN/A transmitList.size(), backoffTime, inRetry, 2072384SN/A backoffEvent.scheduled()); 2082384SN/A} 2092901Ssaidi@eecs.umich.edu 2102901Ssaidi@eecs.umich.edu 2112685Ssaidi@eecs.umich.eduvoid 2122384SN/ADmaPort::dmaAction(Packet::Command cmd, Addr addr, int size, Event *event, 2132406SN/A uint8_t *data) 2142406SN/A{ 2152663Sstever@eecs.umich.edu assert(event); 2162641Sstever@eecs.umich.edu 2172641Sstever@eecs.umich.edu assert(device->getState() == SimObject::Running); 2182384SN/A 2192566SN/A DmaReqState *reqState = new DmaReqState(event, this, size); 2202685Ssaidi@eecs.umich.edu 2212641Sstever@eecs.umich.edu 2222685Ssaidi@eecs.umich.edu DPRINTF(DMA, "Starting DMA for addr: %#x size: %d sched: %d\n", addr, size, 2232641Sstever@eecs.umich.edu event->scheduled()); 2242565SN/A for (ChunkGenerator gen(addr, size, peerBlockSize()); 2252565SN/A !gen.done(); gen.next()) { 2262566SN/A Request *req = new Request(gen.addr(), gen.size(), 0); 2272384SN/A PacketPtr pkt = new Packet(req, cmd, Packet::Broadcast); 2282901Ssaidi@eecs.umich.edu 2292384SN/A // Increment the data pointer on a write 2302384SN/A if (data) 2312384SN/A pkt->dataStatic(data + gen.complete()); 2322384SN/A 2332685Ssaidi@eecs.umich.edu pkt->senderState = reqState; 2342384SN/A 2352901Ssaidi@eecs.umich.edu assert(pendingCount >= 0); 2362901Ssaidi@eecs.umich.edu pendingCount++; 2372901Ssaidi@eecs.umich.edu DPRINTF(DMA, "--Queuing DMA for addr: %#x size: %d\n", gen.addr(), 2382902Ssaidi@eecs.umich.edu gen.size()); 2392901Ssaidi@eecs.umich.edu queueDma(pkt); 2402901Ssaidi@eecs.umich.edu } 2412901Ssaidi@eecs.umich.edu 2422901Ssaidi@eecs.umich.edu} 2432901Ssaidi@eecs.umich.edu 2442901Ssaidi@eecs.umich.eduvoid 2452901Ssaidi@eecs.umich.eduDmaPort::queueDma(PacketPtr pkt, bool front) 2462901Ssaidi@eecs.umich.edu{ 2472901Ssaidi@eecs.umich.edu 2482901Ssaidi@eecs.umich.edu if (front) 2492901Ssaidi@eecs.umich.edu transmitList.push_front(pkt); 2502901Ssaidi@eecs.umich.edu else 2512901Ssaidi@eecs.umich.edu transmitList.push_back(pkt); 2522901Ssaidi@eecs.umich.edu sendDma(); 2532902Ssaidi@eecs.umich.edu} 2542902Ssaidi@eecs.umich.edu 2552901Ssaidi@eecs.umich.edu 2562901Ssaidi@eecs.umich.eduvoid 2572901Ssaidi@eecs.umich.eduDmaPort::sendDma() 2582384SN/A{ 2592901Ssaidi@eecs.umich.edu // some kind of selction between access methods 2602901Ssaidi@eecs.umich.edu // more work is going to have to be done to make 2612902Ssaidi@eecs.umich.edu // switching actually work 2622901Ssaidi@eecs.umich.edu assert(transmitList.size()); 2632901Ssaidi@eecs.umich.edu PacketPtr pkt = transmitList.front(); 2642901Ssaidi@eecs.umich.edu 2652901Ssaidi@eecs.umich.edu System::MemoryMode state = sys->getMemoryMode(); 2662901Ssaidi@eecs.umich.edu if (state == System::Timing) { 2672901Ssaidi@eecs.umich.edu if (backoffEvent.scheduled() || inRetry) { 2682566SN/A DPRINTF(DMA, "Can't send immediately, waiting for retry or backoff timer\n"); 2692901Ssaidi@eecs.umich.edu return; 2702901Ssaidi@eecs.umich.edu } 2712901Ssaidi@eecs.umich.edu 2722901Ssaidi@eecs.umich.edu DPRINTF(DMA, "Attempting to send Packet %#x with addr: %#x\n", 2732901Ssaidi@eecs.umich.edu pkt, pkt->getAddr()); 2742384SN/A 2752384SN/A bool result; 2762384SN/A do { 277545SN/A result = sendTiming(pkt); 278545SN/A if (result) { 279545SN/A transmitList.pop_front(); 2802489SN/A DPRINTF(DMA, "-- Done\n"); 2812489SN/A } else { 282545SN/A inRetry = true; 283545SN/A DPRINTF(DMA, "-- Failed: queued\n"); 284679SN/A } 285 } while (result && !backoffTime && transmitList.size()); 286 287 if (transmitList.size() && backoffTime && !inRetry && 288 !backoffEvent.scheduled()) { 289 DPRINTF(DMA, "-- Scheduling backoff timer for %d\n", 290 backoffTime+curTick); 291 backoffEvent.schedule(backoffTime+curTick); 292 } 293 } else if (state == System::Atomic) { 294 transmitList.pop_front(); 295 296 Tick lat; 297 DPRINTF(DMA, "--Sending DMA for addr: %#x size: %d\n", 298 pkt->req->getPaddr(), pkt->req->getSize()); 299 lat = sendAtomic(pkt); 300 assert(pkt->senderState); 301 DmaReqState *state = dynamic_cast<DmaReqState*>(pkt->senderState); 302 assert(state); 303 state->numBytes += pkt->req->getSize(); 304 305 DPRINTF(DMA, "--Received response for DMA for addr: %#x size: %d nb: %d, tot: %d sched %d\n", 306 pkt->req->getPaddr(), pkt->req->getSize(), state->numBytes, 307 state->totBytes, state->completionEvent->scheduled()); 308 309 if (state->totBytes == state->numBytes) { 310 assert(!state->completionEvent->scheduled()); 311 state->completionEvent->schedule(curTick + lat); 312 delete state; 313 delete pkt->req; 314 } 315 pendingCount--; 316 assert(pendingCount >= 0); 317 delete pkt; 318 319 if (pendingCount == 0 && drainEvent) { 320 drainEvent->process(); 321 drainEvent = NULL; 322 } 323 324 } else 325 panic("Unknown memory command state."); 326} 327 328DmaDevice::~DmaDevice() 329{ 330 if (dmaPort) 331 delete dmaPort; 332} 333 334 335