io_device.cc revision 5534
12207SN/A/* 25254Sksewell@umich.edu * Copyright (c) 2006 The Regents of The University of Michigan 35254Sksewell@umich.edu * All rights reserved. 42207SN/A * 55254Sksewell@umich.edu * Redistribution and use in source and binary forms, with or without 65254Sksewell@umich.edu * modification, are permitted provided that the following conditions are 75254Sksewell@umich.edu * met: redistributions of source code must retain the above copyright 85254Sksewell@umich.edu * notice, this list of conditions and the following disclaimer; 95254Sksewell@umich.edu * redistributions in binary form must reproduce the above copyright 105254Sksewell@umich.edu * notice, this list of conditions and the following disclaimer in the 115254Sksewell@umich.edu * documentation and/or other materials provided with the distribution; 125254Sksewell@umich.edu * neither the name of the copyright holders nor the names of its 135254Sksewell@umich.edu * contributors may be used to endorse or promote products derived from 145254Sksewell@umich.edu * this software without specific prior written permission. 152207SN/A * 165254Sksewell@umich.edu * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 175254Sksewell@umich.edu * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 185254Sksewell@umich.edu * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 195254Sksewell@umich.edu * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 205254Sksewell@umich.edu * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 215254Sksewell@umich.edu * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 225254Sksewell@umich.edu * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 235254Sksewell@umich.edu * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 245254Sksewell@umich.edu * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 255254Sksewell@umich.edu * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 265254Sksewell@umich.edu * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 272665Ssaidi@eecs.umich.edu * 285254Sksewell@umich.edu * Authors: Ali Saidi 295254Sksewell@umich.edu * Nathan Binkert 305254Sksewell@umich.edu */ 312207SN/A 322207SN/A#include "base/chunk_generator.hh" 332474SN/A#include "base/trace.hh" 342207SN/A#include "dev/io_device.hh" 356650Sksewell@umich.edu#include "sim/system.hh" 362454SN/A 376811SMatt DeVuyst 382454SN/APioPort::PioPort(PioDevice *dev, System *s, std::string pname) 392680Sktlim@umich.edu : SimpleTimingPort(dev->name() + pname, dev), device(dev) 406650Sksewell@umich.edu{ } 416650Sksewell@umich.edu 426650Sksewell@umich.edu 436650Sksewell@umich.eduTick 446650Sksewell@umich.eduPioPort::recvAtomic(PacketPtr pkt) 452474SN/A{ 462207SN/A return pkt->isRead() ? device->read(pkt) : device->write(pkt); 472447SN/A} 482474SN/A 492447SN/Avoid 505154Sgblack@eecs.umich.eduPioPort::getDeviceAddressRanges(AddrRangeList &resp, bool &snoop) 515154Sgblack@eecs.umich.edu{ 525154Sgblack@eecs.umich.edu snoop = false; 532474SN/A device->addressRanges(resp); 542686Sksewell@umich.edu} 552686Sksewell@umich.edu 562935Sksewell@umich.edu 572474SN/APioDevice::PioDevice(const Params *p) 582474SN/A : MemObject(p), platform(p->platform), sys(p->system), pioPort(NULL) 592474SN/A{} 602474SN/A 612686Sksewell@umich.eduPioDevice::~PioDevice() 622686Sksewell@umich.edu{ 632686Sksewell@umich.edu if (pioPort) 642686Sksewell@umich.edu delete pioPort; 656811SMatt DeVuyst} 666811SMatt DeVuyst 672474SN/Avoid 682474SN/APioDevice::init() 692474SN/A{ 707532Ssteve.reinhardt@amd.com if (!pioPort) 712474SN/A panic("Pio port not connected to anything!"); 727532Ssteve.reinhardt@amd.com pioPort->sendStatusChange(Port::RangeChange); 736650Sksewell@umich.edu} 746811SMatt DeVuyst 752474SN/A 765958Sgblack@eecs.umich.eduunsigned int 776811SMatt DeVuystPioDevice::drain(Event *de) 786650Sksewell@umich.edu{ 796811SMatt DeVuyst unsigned int count; 806650Sksewell@umich.edu count = pioPort->drain(de); 816811SMatt DeVuyst if (count) 826811SMatt DeVuyst changeState(Draining); 836650Sksewell@umich.edu else 846650Sksewell@umich.edu changeState(Drained); 856650Sksewell@umich.edu return count; 866811SMatt DeVuyst} 876811SMatt DeVuyst 886811SMatt DeVuystBasicPioDevice::BasicPioDevice(const Params *p) 896811SMatt DeVuyst : PioDevice(p), pioAddr(p->pio_addr), pioSize(0), 906811SMatt DeVuyst pioDelay(p->pio_latency) 916811SMatt DeVuyst{} 926811SMatt DeVuyst 936811SMatt DeVuystvoid 946811SMatt DeVuystBasicPioDevice::addressRanges(AddrRangeList &range_list) 956811SMatt DeVuyst{ 966811SMatt DeVuyst assert(pioSize != 0); 976811SMatt DeVuyst range_list.clear(); 986811SMatt DeVuyst range_list.push_back(RangeSize(pioAddr, pioSize)); 996811SMatt DeVuyst} 1006811SMatt DeVuyst 1016811SMatt DeVuyst 1026811SMatt DeVuystDmaPort::DmaPort(DmaDevice *dev, System *s) 1036811SMatt DeVuyst : Port(dev->name() + "-dmaport", dev), device(dev), sys(s), 1046811SMatt DeVuyst pendingCount(0), actionInProgress(0), drainEvent(NULL), 1056811SMatt DeVuyst backoffTime(0), inRetry(false), backoffEvent(this) 1066811SMatt DeVuyst{ } 1076811SMatt DeVuyst 1086811SMatt DeVuystbool 1096811SMatt DeVuystDmaPort::recvTiming(PacketPtr pkt) 1106811SMatt DeVuyst{ 1116811SMatt DeVuyst if (pkt->wasNacked()) { 1126811SMatt DeVuyst DPRINTF(DMA, "Received nacked %s addr %#x\n", 1136811SMatt DeVuyst pkt->cmdString(), pkt->getAddr()); 1146811SMatt DeVuyst 1156650Sksewell@umich.edu if (backoffTime < device->minBackoffDelay) 1166650Sksewell@umich.edu backoffTime = device->minBackoffDelay; 1176811SMatt DeVuyst else if (backoffTime < device->maxBackoffDelay) 1186811SMatt DeVuyst backoffTime <<= 1; 1196650Sksewell@umich.edu 1206650Sksewell@umich.edu backoffEvent.reschedule(curTick + backoffTime, true); 1216650Sksewell@umich.edu 1226650Sksewell@umich.edu DPRINTF(DMA, "Backoff time set to %d ticks\n", backoffTime); 1236650Sksewell@umich.edu 1246650Sksewell@umich.edu pkt->reinitNacked(); 1256650Sksewell@umich.edu queueDma(pkt, true); 1266650Sksewell@umich.edu } else if (pkt->senderState) { 1276650Sksewell@umich.edu DmaReqState *state; 1286650Sksewell@umich.edu backoffTime >>= 2; 1296811SMatt DeVuyst 1306811SMatt DeVuyst DPRINTF(DMA, "Received response %s addr %#x size %#x\n", 1316811SMatt DeVuyst pkt->cmdString(), pkt->getAddr(), pkt->req->getSize()); 1326811SMatt DeVuyst state = dynamic_cast<DmaReqState*>(pkt->senderState); 1336811SMatt DeVuyst pendingCount--; 1346650Sksewell@umich.edu 1356650Sksewell@umich.edu assert(pendingCount >= 0); 1366650Sksewell@umich.edu assert(state); 1376650Sksewell@umich.edu 1386650Sksewell@umich.edu state->numBytes += pkt->req->getSize(); 1396650Sksewell@umich.edu assert(state->totBytes >= state->numBytes); 1406650Sksewell@umich.edu if (state->totBytes == state->numBytes) { 1416650Sksewell@umich.edu if (state->delay) 1426650Sksewell@umich.edu state->completionEvent->schedule(state->delay + curTick); 1436650Sksewell@umich.edu else 1446811SMatt DeVuyst state->completionEvent->process(); 1456811SMatt DeVuyst delete state; 1466811SMatt DeVuyst } 1476811SMatt DeVuyst delete pkt->req; 1486811SMatt DeVuyst delete pkt; 1496650Sksewell@umich.edu 1506650Sksewell@umich.edu if (pendingCount == 0 && drainEvent) { 1516811SMatt DeVuyst drainEvent->process(); 1526650Sksewell@umich.edu drainEvent = NULL; 1536811SMatt DeVuyst } 1546650Sksewell@umich.edu } else { 1556650Sksewell@umich.edu panic("Got packet without sender state... huh?\n"); 1566650Sksewell@umich.edu } 1576650Sksewell@umich.edu 1586650Sksewell@umich.edu return true; 1596650Sksewell@umich.edu} 1606650Sksewell@umich.edu 1616811SMatt DeVuystDmaDevice::DmaDevice(const Params *p) 1626811SMatt DeVuyst : PioDevice(p), dmaPort(NULL), minBackoffDelay(p->min_backoff_delay), 1636811SMatt DeVuyst maxBackoffDelay(p->max_backoff_delay) 1646811SMatt DeVuyst{ } 1656811SMatt DeVuyst 1666811SMatt DeVuyst 1676811SMatt DeVuystunsigned int 1686811SMatt DeVuystDmaDevice::drain(Event *de) 1696811SMatt DeVuyst{ 1706811SMatt DeVuyst unsigned int count; 1716811SMatt DeVuyst count = pioPort->drain(de) + dmaPort->drain(de); 1726811SMatt DeVuyst if (count) 1736811SMatt DeVuyst changeState(Draining); 1746811SMatt DeVuyst else 1756811SMatt DeVuyst changeState(Drained); 1766650Sksewell@umich.edu return count; 1776650Sksewell@umich.edu} 1786650Sksewell@umich.edu 1796650Sksewell@umich.eduunsigned int 1806650Sksewell@umich.eduDmaPort::drain(Event *de) 1816650Sksewell@umich.edu{ 1826650Sksewell@umich.edu if (pendingCount == 0) 1836650Sksewell@umich.edu return 0; 1846650Sksewell@umich.edu drainEvent = de; 1856650Sksewell@umich.edu return 1; 1866650Sksewell@umich.edu} 1876650Sksewell@umich.edu 1886650Sksewell@umich.edu 1895958Sgblack@eecs.umich.eduvoid 1906701Sgblack@eecs.umich.eduDmaPort::recvRetry() 1915958Sgblack@eecs.umich.edu{ 1925958Sgblack@eecs.umich.edu assert(transmitList.size()); 1936701Sgblack@eecs.umich.edu PacketPtr pkt = transmitList.front(); 1945958Sgblack@eecs.umich.edu bool result = true; 1955958Sgblack@eecs.umich.edu do { 1965958Sgblack@eecs.umich.edu DPRINTF(DMA, "Retry on %s addr %#x\n", 1975958Sgblack@eecs.umich.edu pkt->cmdString(), pkt->getAddr()); 1985958Sgblack@eecs.umich.edu result = sendTiming(pkt); 1995958Sgblack@eecs.umich.edu if (result) { 2005958Sgblack@eecs.umich.edu DPRINTF(DMA, "-- Done\n"); 2015958Sgblack@eecs.umich.edu transmitList.pop_front(); 2025958Sgblack@eecs.umich.edu inRetry = false; 2035958Sgblack@eecs.umich.edu } else { 2045958Sgblack@eecs.umich.edu inRetry = true; 2055958Sgblack@eecs.umich.edu DPRINTF(DMA, "-- Failed, queued\n"); 2065958Sgblack@eecs.umich.edu } 2075958Sgblack@eecs.umich.edu } while (!backoffTime && result && transmitList.size()); 2085958Sgblack@eecs.umich.edu 2095958Sgblack@eecs.umich.edu if (transmitList.size() && backoffTime && !inRetry) { 2105958Sgblack@eecs.umich.edu DPRINTF(DMA, "Scheduling backoff for %d\n", curTick+backoffTime); 2115958Sgblack@eecs.umich.edu if (!backoffEvent.scheduled()) 2125958Sgblack@eecs.umich.edu backoffEvent.schedule(backoffTime+curTick); 2135958Sgblack@eecs.umich.edu } 2145958Sgblack@eecs.umich.edu DPRINTF(DMA, "TransmitList: %d, backoffTime: %d inRetry: %d es: %d\n", 2155958Sgblack@eecs.umich.edu transmitList.size(), backoffTime, inRetry, 2165958Sgblack@eecs.umich.edu backoffEvent.scheduled()); 2175958Sgblack@eecs.umich.edu} 218 219 220void 221DmaPort::dmaAction(Packet::Command cmd, Addr addr, int size, Event *event, 222 uint8_t *data, Tick delay) 223{ 224 assert(event); 225 226 assert(device->getState() == SimObject::Running); 227 228 DmaReqState *reqState = new DmaReqState(event, this, size, delay); 229 230 231 DPRINTF(DMA, "Starting DMA for addr: %#x size: %d sched: %d\n", addr, size, 232 event->scheduled()); 233 for (ChunkGenerator gen(addr, size, peerBlockSize()); 234 !gen.done(); gen.next()) { 235 Request *req = new Request(gen.addr(), gen.size(), 0); 236 PacketPtr pkt = new Packet(req, cmd, Packet::Broadcast); 237 238 // Increment the data pointer on a write 239 if (data) 240 pkt->dataStatic(data + gen.complete()); 241 242 pkt->senderState = reqState; 243 244 assert(pendingCount >= 0); 245 pendingCount++; 246 DPRINTF(DMA, "--Queuing DMA for addr: %#x size: %d\n", gen.addr(), 247 gen.size()); 248 queueDma(pkt); 249 } 250 251} 252 253void 254DmaPort::queueDma(PacketPtr pkt, bool front) 255{ 256 257 if (front) 258 transmitList.push_front(pkt); 259 else 260 transmitList.push_back(pkt); 261 sendDma(); 262} 263 264 265void 266DmaPort::sendDma() 267{ 268 // some kind of selction between access methods 269 // more work is going to have to be done to make 270 // switching actually work 271 assert(transmitList.size()); 272 PacketPtr pkt = transmitList.front(); 273 274 Enums::MemoryMode state = sys->getMemoryMode(); 275 if (state == Enums::timing) { 276 if (backoffEvent.scheduled() || inRetry) { 277 DPRINTF(DMA, "Can't send immediately, waiting for retry or backoff timer\n"); 278 return; 279 } 280 281 DPRINTF(DMA, "Attempting to send %s addr %#x\n", 282 pkt->cmdString(), pkt->getAddr()); 283 284 bool result; 285 do { 286 result = sendTiming(pkt); 287 if (result) { 288 transmitList.pop_front(); 289 DPRINTF(DMA, "-- Done\n"); 290 } else { 291 inRetry = true; 292 DPRINTF(DMA, "-- Failed: queued\n"); 293 } 294 } while (result && !backoffTime && transmitList.size()); 295 296 if (transmitList.size() && backoffTime && !inRetry && 297 !backoffEvent.scheduled()) { 298 DPRINTF(DMA, "-- Scheduling backoff timer for %d\n", 299 backoffTime+curTick); 300 backoffEvent.schedule(backoffTime+curTick); 301 } 302 } else if (state == Enums::atomic) { 303 transmitList.pop_front(); 304 305 Tick lat; 306 DPRINTF(DMA, "--Sending DMA for addr: %#x size: %d\n", 307 pkt->req->getPaddr(), pkt->req->getSize()); 308 lat = sendAtomic(pkt); 309 assert(pkt->senderState); 310 DmaReqState *state = dynamic_cast<DmaReqState*>(pkt->senderState); 311 assert(state); 312 state->numBytes += pkt->req->getSize(); 313 314 DPRINTF(DMA, "--Received response for DMA for addr: %#x size: %d nb: %d, tot: %d sched %d\n", 315 pkt->req->getPaddr(), pkt->req->getSize(), state->numBytes, 316 state->totBytes, state->completionEvent->scheduled()); 317 318 if (state->totBytes == state->numBytes) { 319 assert(!state->completionEvent->scheduled()); 320 state->completionEvent->schedule(curTick + lat + state->delay); 321 delete state; 322 delete pkt->req; 323 } 324 pendingCount--; 325 assert(pendingCount >= 0); 326 delete pkt; 327 328 if (pendingCount == 0 && drainEvent) { 329 drainEvent->process(); 330 drainEvent = NULL; 331 } 332 333 } else 334 panic("Unknown memory command state."); 335} 336 337DmaDevice::~DmaDevice() 338{ 339 if (dmaPort) 340 delete dmaPort; 341} 342