io_device.cc revision 2902
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/trace.hh" 33#include "dev/io_device.hh" 34#include "sim/builder.hh" 35#include "sim/system.hh" 36 37 38PioPort::PioPort(PioDevice *dev, System *s, std::string pname) 39 : Port(dev->name() + pname), device(dev), sys(s), 40 outTiming(0), drainEvent(NULL) 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 64void 65PioPort::recvRetry() 66{ 67 bool result = true; 68 while (result && transmitList.size()) { 69 result = Port::sendTiming(transmitList.front()); 70 if (result) 71 transmitList.pop_front(); 72 } 73 if (transmitList.size() == 0 && drainEvent) { 74 drainEvent->process(); 75 drainEvent = NULL; 76 } 77} 78 79void 80PioPort::SendEvent::process() 81{ 82 port->outTiming--; 83 assert(port->outTiming >= 0); 84 if (port->Port::sendTiming(packet)) 85 if (port->transmitList.size() == 0 && port->drainEvent) { 86 port->drainEvent->process(); 87 port->drainEvent = NULL; 88 } 89 return; 90 91 port->transmitList.push_back(packet); 92} 93 94void 95PioPort::resendNacked(Packet *pkt) { 96 pkt->reinitNacked(); 97 if (transmitList.size()) { 98 transmitList.push_front(pkt); 99 } else { 100 if (!Port::sendTiming(pkt)) 101 transmitList.push_front(pkt); 102 } 103}; 104 105 106bool 107PioPort::recvTiming(Packet *pkt) 108{ 109 if (pkt->result == Packet::Nacked) { 110 resendNacked(pkt); 111 } else { 112 Tick latency = device->recvAtomic(pkt); 113 // turn packet around to go back to requester 114 pkt->makeTimingResponse(); 115 sendTiming(pkt, latency); 116 } 117 return true; 118} 119 120unsigned int 121PioPort::drain(Event *de) 122{ 123 if (outTiming == 0 && transmitList.size() == 0) 124 return 0; 125 drainEvent = de; 126 return 1; 127} 128 129PioDevice::~PioDevice() 130{ 131 if (pioPort) 132 delete pioPort; 133} 134 135void 136PioDevice::init() 137{ 138 if (!pioPort) 139 panic("Pio port not connected to anything!"); 140 pioPort->sendStatusChange(Port::RangeChange); 141} 142 143 144unsigned int 145PioDevice::drain(Event *de) 146{ 147 unsigned int count; 148 count = pioPort->drain(de); 149 if (count) 150 changeState(Draining); 151 else 152 changeState(Drained); 153 return count; 154} 155 156void 157BasicPioDevice::addressRanges(AddrRangeList &range_list) 158{ 159 assert(pioSize != 0); 160 range_list.clear(); 161 range_list.push_back(RangeSize(pioAddr, pioSize)); 162} 163 164 165DmaPort::DmaPort(DmaDevice *dev, System *s) 166 : Port(dev->name() + "-dmaport"), device(dev), sys(s), pendingCount(0), 167 actionInProgress(0), drainEvent(NULL) 168{ } 169 170bool 171DmaPort::recvTiming(Packet *pkt) 172{ 173 174 175 if (pkt->result == Packet::Nacked) { 176 DPRINTF(DMA, "Received nacked Pkt %#x with State: %#x Addr: %#x\n", 177 pkt, pkt->senderState, pkt->getAddr()); 178 pkt->reinitNacked(); 179 sendDma(pkt, true); 180 } else if (pkt->senderState) { 181 DmaReqState *state; 182 DPRINTF(DMA, "Received response Pkt %#x with State: %#x Addr: %#x\n", 183 pkt, pkt->senderState, pkt->getAddr()); 184 state = dynamic_cast<DmaReqState*>(pkt->senderState); 185 pendingCount--; 186 187 assert(pendingCount >= 0); 188 assert(state); 189 190 state->numBytes += pkt->req->getSize(); 191 if (state->totBytes == state->numBytes) { 192 state->completionEvent->process(); 193 delete state; 194 } 195 delete pkt->req; 196 delete pkt; 197 198 if (pendingCount == 0 && drainEvent) { 199 drainEvent->process(); 200 drainEvent = NULL; 201 } 202 } else { 203 panic("Got packet without sender state... huh?\n"); 204 } 205 206 return true; 207} 208 209DmaDevice::DmaDevice(Params *p) 210 : PioDevice(p), dmaPort(NULL) 211{ } 212 213 214unsigned int 215DmaDevice::drain(Event *de) 216{ 217 unsigned int count; 218 count = pioPort->drain(de) + dmaPort->drain(de); 219 if (count) 220 changeState(Draining); 221 else 222 changeState(Drained); 223 return count; 224} 225 226unsigned int 227DmaPort::drain(Event *de) 228{ 229 if (pendingCount == 0) 230 return 0; 231 drainEvent = de; 232 return 1; 233} 234 235 236void 237DmaPort::recvRetry() 238{ 239 Packet* pkt = transmitList.front(); 240 bool result = true; 241 while (result && transmitList.size()) { 242 DPRINTF(DMA, "Retry on Packet %#x with senderState: %#x\n", 243 pkt, pkt->senderState); 244 result = sendTiming(pkt); 245 if (result) { 246 DPRINTF(DMA, "-- Done\n"); 247 transmitList.pop_front(); 248 } else { 249 DPRINTF(DMA, "-- Failed, queued\n"); 250 } 251 } 252} 253 254 255void 256DmaPort::dmaAction(Packet::Command cmd, Addr addr, int size, Event *event, 257 uint8_t *data) 258{ 259 assert(event); 260 261 assert(device->getState() == SimObject::Running); 262 263 DmaReqState *reqState = new DmaReqState(event, this, size); 264 265 for (ChunkGenerator gen(addr, size, peerBlockSize()); 266 !gen.done(); gen.next()) { 267 Request *req = new Request(gen.addr(), gen.size(), 0); 268 Packet *pkt = new Packet(req, cmd, Packet::Broadcast); 269 270 // Increment the data pointer on a write 271 if (data) 272 pkt->dataStatic(data + gen.complete()); 273 274 pkt->senderState = reqState; 275 276 assert(pendingCount >= 0); 277 pendingCount++; 278 sendDma(pkt); 279 } 280 281} 282 283 284void 285DmaPort::sendDma(Packet *pkt, bool front) 286{ 287 // some kind of selction between access methods 288 // more work is going to have to be done to make 289 // switching actually work 290 291 System::MemoryMode state = sys->getMemoryMode(); 292 if (state == System::Timing) { 293 DPRINTF(DMA, "Attempting to send Packet %#x with addr: %#x\n", 294 pkt, pkt->getAddr()); 295 if (transmitList.size() || !sendTiming(pkt)) { 296 if (front) 297 transmitList.push_front(pkt); 298 else 299 transmitList.push_back(pkt); 300 DPRINTF(DMA, "-- Failed: queued\n"); 301 } else { 302 DPRINTF(DMA, "-- Done\n"); 303 } 304 } else if (state == System::Atomic) { 305 Tick lat; 306 lat = sendAtomic(pkt); 307 assert(pkt->senderState); 308 DmaReqState *state = dynamic_cast<DmaReqState*>(pkt->senderState); 309 assert(state); 310 311 state->numBytes += pkt->req->getSize(); 312 if (state->totBytes == state->numBytes) { 313 state->completionEvent->schedule(curTick + lat); 314 delete state; 315 delete pkt->req; 316 } 317 pendingCount--; 318 assert(pendingCount >= 0); 319 delete pkt; 320 321 if (pendingCount == 0 && drainEvent) { 322 drainEvent->process(); 323 drainEvent = NULL; 324 } 325 326 } else 327 panic("Unknown memory command state."); 328} 329 330DmaDevice::~DmaDevice() 331{ 332 if (dmaPort) 333 delete dmaPort; 334} 335 336 337