io_device.cc revision 4870
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" 34545SN/A#include "dev/io_device.hh" 35679SN/A#include "sim/builder.hh" 362901Ssaidi@eecs.umich.edu#include "sim/system.hh" 37545SN/A 382489SN/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); 552489SN/A} 562489SN/A 572489SN/A 58545SN/APioDevice::~PioDevice() 59545SN/A{ 602384SN/A if (pioPort) 612489SN/A delete pioPort; 62545SN/A} 63545SN/A 642542SN/Avoid 652541SN/APioDevice::init() 662541SN/A{ 672541SN/A if (!pioPort) 682541SN/A panic("Pio port not connected to anything!"); 692541SN/A pioPort->sendStatusChange(Port::RangeChange); 702541SN/A} 712541SN/A 722901Ssaidi@eecs.umich.edu 732901Ssaidi@eecs.umich.eduunsigned int 742901Ssaidi@eecs.umich.eduPioDevice::drain(Event *de) 752901Ssaidi@eecs.umich.edu{ 762901Ssaidi@eecs.umich.edu unsigned int count; 772901Ssaidi@eecs.umich.edu count = pioPort->drain(de); 782901Ssaidi@eecs.umich.edu if (count) 792901Ssaidi@eecs.umich.edu changeState(Draining); 802901Ssaidi@eecs.umich.edu else 812901Ssaidi@eecs.umich.edu changeState(Drained); 822901Ssaidi@eecs.umich.edu return count; 832901Ssaidi@eecs.umich.edu} 842901Ssaidi@eecs.umich.edu 852539SN/Avoid 862539SN/ABasicPioDevice::addressRanges(AddrRangeList &range_list) 872539SN/A{ 882539SN/A assert(pioSize != 0); 892539SN/A range_list.clear(); 902539SN/A range_list.push_back(RangeSize(pioAddr, pioSize)); 912539SN/A} 922539SN/A 932489SN/A 942901Ssaidi@eecs.umich.eduDmaPort::DmaPort(DmaDevice *dev, System *s) 953401Sktlim@umich.edu : Port(dev->name() + "-dmaport", dev), device(dev), sys(s), 964435Ssaidi@eecs.umich.edu pendingCount(0), actionInProgress(0), drainEvent(NULL), 974435Ssaidi@eecs.umich.edu backoffTime(0), inRetry(false), backoffEvent(this) 982489SN/A{ } 992489SN/A 1002489SN/Abool 1013349Sbinkertn@umich.eduDmaPort::recvTiming(PacketPtr pkt) 1022384SN/A{ 1034870Sstever@eecs.umich.edu if (pkt->wasNacked()) { 1042685Ssaidi@eecs.umich.edu DPRINTF(DMA, "Received nacked Pkt %#x with State: %#x Addr: %#x\n", 1052685Ssaidi@eecs.umich.edu pkt, pkt->senderState, pkt->getAddr()); 1064435Ssaidi@eecs.umich.edu 1074435Ssaidi@eecs.umich.edu if (backoffTime < device->minBackoffDelay) 1084435Ssaidi@eecs.umich.edu backoffTime = device->minBackoffDelay; 1094435Ssaidi@eecs.umich.edu else if (backoffTime < device->maxBackoffDelay) 1104435Ssaidi@eecs.umich.edu backoffTime <<= 1; 1114435Ssaidi@eecs.umich.edu 1124437Ssaidi@eecs.umich.edu backoffEvent.reschedule(curTick + backoffTime, true); 1134435Ssaidi@eecs.umich.edu 1144435Ssaidi@eecs.umich.edu DPRINTF(DMA, "Backoff time set to %d ticks\n", backoffTime); 1154435Ssaidi@eecs.umich.edu 1162685Ssaidi@eecs.umich.edu pkt->reinitNacked(); 1174435Ssaidi@eecs.umich.edu queueDma(pkt, true); 1182685Ssaidi@eecs.umich.edu } else if (pkt->senderState) { 1192565SN/A DmaReqState *state; 1204435Ssaidi@eecs.umich.edu backoffTime >>= 2; 1214435Ssaidi@eecs.umich.edu 1224435Ssaidi@eecs.umich.edu DPRINTF(DMA, "Received response Pkt %#x with State: %#x Addr: %#x size: %#x\n", 1234435Ssaidi@eecs.umich.edu pkt, pkt->senderState, pkt->getAddr(), pkt->req->getSize()); 1242641Sstever@eecs.umich.edu state = dynamic_cast<DmaReqState*>(pkt->senderState); 1252685Ssaidi@eecs.umich.edu pendingCount--; 1262685Ssaidi@eecs.umich.edu 1272685Ssaidi@eecs.umich.edu assert(pendingCount >= 0); 1282657Ssaidi@eecs.umich.edu assert(state); 1292685Ssaidi@eecs.umich.edu 1302685Ssaidi@eecs.umich.edu state->numBytes += pkt->req->getSize(); 1314435Ssaidi@eecs.umich.edu assert(state->totBytes >= state->numBytes); 1322685Ssaidi@eecs.umich.edu if (state->totBytes == state->numBytes) { 1332685Ssaidi@eecs.umich.edu state->completionEvent->process(); 1342685Ssaidi@eecs.umich.edu delete state; 1352685Ssaidi@eecs.umich.edu } 1362630SN/A delete pkt->req; 1372630SN/A delete pkt; 1382901Ssaidi@eecs.umich.edu 1392901Ssaidi@eecs.umich.edu if (pendingCount == 0 && drainEvent) { 1402901Ssaidi@eecs.umich.edu drainEvent->process(); 1412901Ssaidi@eecs.umich.edu drainEvent = NULL; 1422901Ssaidi@eecs.umich.edu } 1432569SN/A } else { 1442685Ssaidi@eecs.umich.edu panic("Got packet without sender state... huh?\n"); 1452565SN/A } 1462569SN/A 1472657Ssaidi@eecs.umich.edu return true; 1482384SN/A} 149679SN/A 1502521SN/ADmaDevice::DmaDevice(Params *p) 1514435Ssaidi@eecs.umich.edu : PioDevice(p), dmaPort(NULL), minBackoffDelay(p->min_backoff_delay), 1524435Ssaidi@eecs.umich.edu maxBackoffDelay(p->max_backoff_delay) 1532565SN/A{ } 1542384SN/A 1552901Ssaidi@eecs.umich.edu 1562901Ssaidi@eecs.umich.eduunsigned int 1572901Ssaidi@eecs.umich.eduDmaDevice::drain(Event *de) 1582901Ssaidi@eecs.umich.edu{ 1592901Ssaidi@eecs.umich.edu unsigned int count; 1602901Ssaidi@eecs.umich.edu count = pioPort->drain(de) + dmaPort->drain(de); 1612901Ssaidi@eecs.umich.edu if (count) 1622901Ssaidi@eecs.umich.edu changeState(Draining); 1632901Ssaidi@eecs.umich.edu else 1642901Ssaidi@eecs.umich.edu changeState(Drained); 1652901Ssaidi@eecs.umich.edu return count; 1662901Ssaidi@eecs.umich.edu} 1672901Ssaidi@eecs.umich.edu 1682901Ssaidi@eecs.umich.eduunsigned int 1692901Ssaidi@eecs.umich.eduDmaPort::drain(Event *de) 1702901Ssaidi@eecs.umich.edu{ 1712901Ssaidi@eecs.umich.edu if (pendingCount == 0) 1722901Ssaidi@eecs.umich.edu return 0; 1732901Ssaidi@eecs.umich.edu drainEvent = de; 1742901Ssaidi@eecs.umich.edu return 1; 1752901Ssaidi@eecs.umich.edu} 1762901Ssaidi@eecs.umich.edu 1772901Ssaidi@eecs.umich.edu 1782384SN/Avoid 1792489SN/ADmaPort::recvRetry() 1802489SN/A{ 1814435Ssaidi@eecs.umich.edu assert(transmitList.size()); 1823349Sbinkertn@umich.edu PacketPtr pkt = transmitList.front(); 1832659Ssaidi@eecs.umich.edu bool result = true; 1844435Ssaidi@eecs.umich.edu do { 1852659Ssaidi@eecs.umich.edu DPRINTF(DMA, "Retry on Packet %#x with senderState: %#x\n", 1862659Ssaidi@eecs.umich.edu pkt, pkt->senderState); 1872659Ssaidi@eecs.umich.edu result = sendTiming(pkt); 1882659Ssaidi@eecs.umich.edu if (result) { 1892659Ssaidi@eecs.umich.edu DPRINTF(DMA, "-- Done\n"); 1902659Ssaidi@eecs.umich.edu transmitList.pop_front(); 1914435Ssaidi@eecs.umich.edu inRetry = false; 1922659Ssaidi@eecs.umich.edu } else { 1934435Ssaidi@eecs.umich.edu inRetry = true; 1942659Ssaidi@eecs.umich.edu DPRINTF(DMA, "-- Failed, queued\n"); 1952659Ssaidi@eecs.umich.edu } 1964435Ssaidi@eecs.umich.edu } while (!backoffTime && result && transmitList.size()); 1974435Ssaidi@eecs.umich.edu 1984435Ssaidi@eecs.umich.edu if (transmitList.size() && backoffTime && !inRetry) { 1994435Ssaidi@eecs.umich.edu DPRINTF(DMA, "Scheduling backoff for %d\n", curTick+backoffTime); 2004435Ssaidi@eecs.umich.edu if (!backoffEvent.scheduled()) 2014435Ssaidi@eecs.umich.edu backoffEvent.schedule(backoffTime+curTick); 2022657Ssaidi@eecs.umich.edu } 2034435Ssaidi@eecs.umich.edu DPRINTF(DMA, "TransmitList: %d, backoffTime: %d inRetry: %d es: %d\n", 2044435Ssaidi@eecs.umich.edu transmitList.size(), backoffTime, inRetry, 2054435Ssaidi@eecs.umich.edu backoffEvent.scheduled()); 2062489SN/A} 2072641Sstever@eecs.umich.edu 2082641Sstever@eecs.umich.edu 2092489SN/Avoid 2102641Sstever@eecs.umich.eduDmaPort::dmaAction(Packet::Command cmd, Addr addr, int size, Event *event, 2112641Sstever@eecs.umich.edu uint8_t *data) 2122384SN/A{ 2132384SN/A assert(event); 2142384SN/A 2152901Ssaidi@eecs.umich.edu assert(device->getState() == SimObject::Running); 2162901Ssaidi@eecs.umich.edu 2172685Ssaidi@eecs.umich.edu DmaReqState *reqState = new DmaReqState(event, this, size); 2182384SN/A 2194451Ssaidi@eecs.umich.edu 2204451Ssaidi@eecs.umich.edu DPRINTF(DMA, "Starting DMA for addr: %#x size: %d sched: %d\n", addr, size, 2214451Ssaidi@eecs.umich.edu event->scheduled()); 2222406SN/A for (ChunkGenerator gen(addr, size, peerBlockSize()); 2232406SN/A !gen.done(); gen.next()) { 2242663Sstever@eecs.umich.edu Request *req = new Request(gen.addr(), gen.size(), 0); 2253349Sbinkertn@umich.edu PacketPtr pkt = new Packet(req, cmd, Packet::Broadcast); 2262641Sstever@eecs.umich.edu 2272384SN/A // Increment the data pointer on a write 2282566SN/A if (data) 2292685Ssaidi@eecs.umich.edu pkt->dataStatic(data + gen.complete()); 2302641Sstever@eecs.umich.edu 2312685Ssaidi@eecs.umich.edu pkt->senderState = reqState; 2322641Sstever@eecs.umich.edu 2332565SN/A assert(pendingCount >= 0); 2342565SN/A pendingCount++; 2354451Ssaidi@eecs.umich.edu DPRINTF(DMA, "--Queuing DMA for addr: %#x size: %d\n", gen.addr(), 2364451Ssaidi@eecs.umich.edu gen.size()); 2374435Ssaidi@eecs.umich.edu queueDma(pkt); 2382384SN/A } 2392901Ssaidi@eecs.umich.edu 2402384SN/A} 2412384SN/A 2424435Ssaidi@eecs.umich.eduvoid 2434435Ssaidi@eecs.umich.eduDmaPort::queueDma(PacketPtr pkt, bool front) 2444435Ssaidi@eecs.umich.edu{ 2454435Ssaidi@eecs.umich.edu 2464435Ssaidi@eecs.umich.edu if (front) 2474435Ssaidi@eecs.umich.edu transmitList.push_front(pkt); 2484435Ssaidi@eecs.umich.edu else 2494435Ssaidi@eecs.umich.edu transmitList.push_back(pkt); 2504435Ssaidi@eecs.umich.edu sendDma(); 2514435Ssaidi@eecs.umich.edu} 2524435Ssaidi@eecs.umich.edu 2532384SN/A 2542384SN/Avoid 2554435Ssaidi@eecs.umich.eduDmaPort::sendDma() 2562384SN/A{ 2572901Ssaidi@eecs.umich.edu // some kind of selction between access methods 2582901Ssaidi@eecs.umich.edu // more work is going to have to be done to make 2592901Ssaidi@eecs.umich.edu // switching actually work 2604435Ssaidi@eecs.umich.edu assert(transmitList.size()); 2614435Ssaidi@eecs.umich.edu PacketPtr pkt = transmitList.front(); 2622902Ssaidi@eecs.umich.edu 2632901Ssaidi@eecs.umich.edu System::MemoryMode state = sys->getMemoryMode(); 2642901Ssaidi@eecs.umich.edu if (state == System::Timing) { 2654435Ssaidi@eecs.umich.edu if (backoffEvent.scheduled() || inRetry) { 2664435Ssaidi@eecs.umich.edu DPRINTF(DMA, "Can't send immediately, waiting for retry or backoff timer\n"); 2674435Ssaidi@eecs.umich.edu return; 2684435Ssaidi@eecs.umich.edu } 2694435Ssaidi@eecs.umich.edu 2702901Ssaidi@eecs.umich.edu DPRINTF(DMA, "Attempting to send Packet %#x with addr: %#x\n", 2712901Ssaidi@eecs.umich.edu pkt, pkt->getAddr()); 2724435Ssaidi@eecs.umich.edu 2734435Ssaidi@eecs.umich.edu bool result; 2744435Ssaidi@eecs.umich.edu do { 2754435Ssaidi@eecs.umich.edu result = sendTiming(pkt); 2764435Ssaidi@eecs.umich.edu if (result) { 2774435Ssaidi@eecs.umich.edu transmitList.pop_front(); 2784435Ssaidi@eecs.umich.edu DPRINTF(DMA, "-- Done\n"); 2794435Ssaidi@eecs.umich.edu } else { 2804435Ssaidi@eecs.umich.edu inRetry = true; 2814435Ssaidi@eecs.umich.edu DPRINTF(DMA, "-- Failed: queued\n"); 2824435Ssaidi@eecs.umich.edu } 2834435Ssaidi@eecs.umich.edu } while (result && !backoffTime && transmitList.size()); 2844435Ssaidi@eecs.umich.edu 2854435Ssaidi@eecs.umich.edu if (transmitList.size() && backoffTime && !inRetry && 2864435Ssaidi@eecs.umich.edu !backoffEvent.scheduled()) { 2874451Ssaidi@eecs.umich.edu DPRINTF(DMA, "-- Scheduling backoff timer for %d\n", 2884451Ssaidi@eecs.umich.edu backoffTime+curTick); 2894435Ssaidi@eecs.umich.edu backoffEvent.schedule(backoffTime+curTick); 2902901Ssaidi@eecs.umich.edu } 2912901Ssaidi@eecs.umich.edu } else if (state == System::Atomic) { 2924435Ssaidi@eecs.umich.edu transmitList.pop_front(); 2934435Ssaidi@eecs.umich.edu 2942902Ssaidi@eecs.umich.edu Tick lat; 2954451Ssaidi@eecs.umich.edu DPRINTF(DMA, "--Sending DMA for addr: %#x size: %d\n", 2964451Ssaidi@eecs.umich.edu pkt->req->getPaddr(), pkt->req->getSize()); 2972902Ssaidi@eecs.umich.edu lat = sendAtomic(pkt); 2982901Ssaidi@eecs.umich.edu assert(pkt->senderState); 2992901Ssaidi@eecs.umich.edu DmaReqState *state = dynamic_cast<DmaReqState*>(pkt->senderState); 3002901Ssaidi@eecs.umich.edu assert(state); 3014451Ssaidi@eecs.umich.edu state->numBytes += pkt->req->getSize(); 3022384SN/A 3034451Ssaidi@eecs.umich.edu DPRINTF(DMA, "--Received response for DMA for addr: %#x size: %d nb: %d, tot: %d sched %d\n", 3044451Ssaidi@eecs.umich.edu pkt->req->getPaddr(), pkt->req->getSize(), state->numBytes, 3054451Ssaidi@eecs.umich.edu state->totBytes, state->completionEvent->scheduled()); 3064451Ssaidi@eecs.umich.edu 3072901Ssaidi@eecs.umich.edu if (state->totBytes == state->numBytes) { 3084451Ssaidi@eecs.umich.edu assert(!state->completionEvent->scheduled()); 3092902Ssaidi@eecs.umich.edu state->completionEvent->schedule(curTick + lat); 3102901Ssaidi@eecs.umich.edu delete state; 3112901Ssaidi@eecs.umich.edu delete pkt->req; 3122901Ssaidi@eecs.umich.edu } 3132901Ssaidi@eecs.umich.edu pendingCount--; 3142901Ssaidi@eecs.umich.edu assert(pendingCount >= 0); 3152901Ssaidi@eecs.umich.edu delete pkt; 3162566SN/A 3172901Ssaidi@eecs.umich.edu if (pendingCount == 0 && drainEvent) { 3182901Ssaidi@eecs.umich.edu drainEvent->process(); 3192901Ssaidi@eecs.umich.edu drainEvent = NULL; 3202901Ssaidi@eecs.umich.edu } 3212901Ssaidi@eecs.umich.edu 3222384SN/A } else 3232384SN/A panic("Unknown memory command state."); 3242384SN/A} 325545SN/A 326545SN/ADmaDevice::~DmaDevice() 327545SN/A{ 3282489SN/A if (dmaPort) 3292489SN/A delete dmaPort; 330545SN/A} 331545SN/A 332679SN/A 333