io_device.cc revision 3090
1/* 2 * Copyright (c) 2006 The Regents of The University of Michigan 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions are 7 * met: redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer; 9 * redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution; 12 * neither the name of the copyright holders nor the names of its 13 * contributors may be used to endorse or promote products derived from 14 * this software without specific prior written permission. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 17 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 18 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 19 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 20 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 22 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 * 28 * Authors: Ali Saidi 29 * Nathan Binkert 30 */ 31 32#include "base/chunk_generator.hh" 33#include "base/trace.hh" 34#include "dev/io_device.hh" 35#include "sim/builder.hh" 36#include "sim/system.hh" 37 38 39PioPort::PioPort(PioDevice *dev, System *s, std::string pname) 40 : SimpleTimingPort(dev->name() + pname), device(dev), sys(s) 41{ } 42 43 44Tick 45PioPort::recvAtomic(Packet *pkt) 46{ 47 return device->recvAtomic(pkt); 48} 49 50void 51PioPort::recvFunctional(Packet *pkt) 52{ 53 device->recvAtomic(pkt); 54} 55 56void 57PioPort::getDeviceAddressRanges(AddrRangeList &resp, AddrRangeList &snoop) 58{ 59 snoop.clear(); 60 device->addressRanges(resp); 61} 62 63 64bool 65PioPort::recvTiming(Packet *pkt) 66{ 67 if (pkt->result == Packet::Nacked) { 68 resendNacked(pkt); 69 } else { 70 Tick latency = device->recvAtomic(pkt); 71 // turn packet around to go back to requester 72 pkt->makeTimingResponse(); 73 sendTiming(pkt, latency); 74 } 75 return true; 76} 77 78PioDevice::~PioDevice() 79{ 80 if (pioPort) 81 delete pioPort; 82} 83 84void 85PioDevice::init() 86{ 87 if (!pioPort) 88 panic("Pio port not connected to anything!"); 89 pioPort->sendStatusChange(Port::RangeChange); 90} 91 92 93unsigned int 94PioDevice::drain(Event *de) 95{ 96 unsigned int count; 97 count = pioPort->drain(de); 98 if (count) 99 changeState(Draining); 100 else 101 changeState(Drained); 102 return count; 103} 104 105void 106BasicPioDevice::addressRanges(AddrRangeList &range_list) 107{ 108 assert(pioSize != 0); 109 range_list.clear(); 110 range_list.push_back(RangeSize(pioAddr, pioSize)); 111} 112 113 114DmaPort::DmaPort(DmaDevice *dev, System *s) 115 : Port(dev->name() + "-dmaport"), device(dev), sys(s), pendingCount(0), 116 actionInProgress(0), drainEvent(NULL) 117{ } 118 119bool 120DmaPort::recvTiming(Packet *pkt) 121{ 122 123 124 if (pkt->result == Packet::Nacked) { 125 DPRINTF(DMA, "Received nacked Pkt %#x with State: %#x Addr: %#x\n", 126 pkt, pkt->senderState, pkt->getAddr()); 127 pkt->reinitNacked(); 128 sendDma(pkt, true); 129 } else if (pkt->senderState) { 130 DmaReqState *state; 131 DPRINTF(DMA, "Received response Pkt %#x with State: %#x Addr: %#x\n", 132 pkt, pkt->senderState, pkt->getAddr()); 133 state = dynamic_cast<DmaReqState*>(pkt->senderState); 134 pendingCount--; 135 136 assert(pendingCount >= 0); 137 assert(state); 138 139 state->numBytes += pkt->req->getSize(); 140 if (state->totBytes == state->numBytes) { 141 state->completionEvent->process(); 142 delete state; 143 } 144 delete pkt->req; 145 delete pkt; 146 147 if (pendingCount == 0 && drainEvent) { 148 drainEvent->process(); 149 drainEvent = NULL; 150 } 151 } else { 152 panic("Got packet without sender state... huh?\n"); 153 } 154 155 return true; 156} 157 158DmaDevice::DmaDevice(Params *p) 159 : PioDevice(p), dmaPort(NULL) 160{ } 161 162 163unsigned int 164DmaDevice::drain(Event *de) 165{ 166 unsigned int count; 167 count = pioPort->drain(de) + dmaPort->drain(de); 168 if (count) 169 changeState(Draining); 170 else 171 changeState(Drained); 172 return count; 173} 174 175unsigned int 176DmaPort::drain(Event *de) 177{ 178 if (pendingCount == 0) 179 return 0; 180 drainEvent = de; 181 return 1; 182} 183 184 185void 186DmaPort::recvRetry() 187{ 188 Packet* pkt = transmitList.front(); 189 bool result = true; 190 while (result && transmitList.size()) { 191 DPRINTF(DMA, "Retry on Packet %#x with senderState: %#x\n", 192 pkt, pkt->senderState); 193 result = sendTiming(pkt); 194 if (result) { 195 DPRINTF(DMA, "-- Done\n"); 196 transmitList.pop_front(); 197 } else { 198 DPRINTF(DMA, "-- Failed, queued\n"); 199 } 200 } 201} 202 203 204void 205DmaPort::dmaAction(Packet::Command cmd, Addr addr, int size, Event *event, 206 uint8_t *data) 207{ 208 assert(event); 209 210 assert(device->getState() == SimObject::Running); 211 212 DmaReqState *reqState = new DmaReqState(event, this, size); 213 214 for (ChunkGenerator gen(addr, size, peerBlockSize()); 215 !gen.done(); gen.next()) { 216 Request *req = new Request(gen.addr(), gen.size(), 0); 217 Packet *pkt = new Packet(req, cmd, Packet::Broadcast); 218 219 // Increment the data pointer on a write 220 if (data) 221 pkt->dataStatic(data + gen.complete()); 222 223 pkt->senderState = reqState; 224 225 assert(pendingCount >= 0); 226 pendingCount++; 227 sendDma(pkt); 228 } 229 230} 231 232 233void 234DmaPort::sendDma(Packet *pkt, bool front) 235{ 236 // some kind of selction between access methods 237 // more work is going to have to be done to make 238 // switching actually work 239 240 System::MemoryMode state = sys->getMemoryMode(); 241 if (state == System::Timing) { 242 DPRINTF(DMA, "Attempting to send Packet %#x with addr: %#x\n", 243 pkt, pkt->getAddr()); 244 if (transmitList.size() || !sendTiming(pkt)) { 245 if (front) 246 transmitList.push_front(pkt); 247 else 248 transmitList.push_back(pkt); 249 DPRINTF(DMA, "-- Failed: queued\n"); 250 } else { 251 DPRINTF(DMA, "-- Done\n"); 252 } 253 } else if (state == System::Atomic) { 254 Tick lat; 255 lat = sendAtomic(pkt); 256 assert(pkt->senderState); 257 DmaReqState *state = dynamic_cast<DmaReqState*>(pkt->senderState); 258 assert(state); 259 260 state->numBytes += pkt->req->getSize(); 261 if (state->totBytes == state->numBytes) { 262 state->completionEvent->schedule(curTick + lat); 263 delete state; 264 delete pkt->req; 265 } 266 pendingCount--; 267 assert(pendingCount >= 0); 268 delete pkt; 269 270 if (pendingCount == 0 && drainEvent) { 271 drainEvent->process(); 272 drainEvent = NULL; 273 } 274 275 } else 276 panic("Unknown memory command state."); 277} 278 279DmaDevice::~DmaDevice() 280{ 281 if (dmaPort) 282 delete dmaPort; 283} 284 285 286