io_device.cc revision 7403
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/system.hh" 36 37 38PioPort::PioPort(PioDevice *dev, System *s, std::string pname) 39 : SimpleTimingPort(dev->name() + pname, dev), device(dev) 40{ } 41 42 43Tick 44PioPort::recvAtomic(PacketPtr pkt) 45{ 46 return pkt->isRead() ? device->read(pkt) : device->write(pkt); 47} 48 49void 50PioPort::getDeviceAddressRanges(AddrRangeList &resp, bool &snoop) 51{ 52 snoop = false; 53 device->addressRanges(resp); 54} 55 56 57PioDevice::PioDevice(const Params *p) 58 : MemObject(p), platform(p->platform), sys(p->system), pioPort(NULL) 59{} 60 61PioDevice::~PioDevice() 62{ 63 if (pioPort) 64 delete pioPort; 65} 66 67void 68PioDevice::init() 69{ 70 if (!pioPort) 71 panic("Pio port not connected to anything!"); 72 pioPort->sendStatusChange(Port::RangeChange); 73} 74 75 76unsigned int 77PioDevice::drain(Event *de) 78{ 79 unsigned int count; 80 count = pioPort->drain(de); 81 if (count) 82 changeState(Draining); 83 else 84 changeState(Drained); 85 return count; 86} 87 88BasicPioDevice::BasicPioDevice(const Params *p) 89 : PioDevice(p), pioAddr(p->pio_addr), pioSize(0), 90 pioDelay(p->pio_latency) 91{} 92 93void 94BasicPioDevice::addressRanges(AddrRangeList &range_list) 95{ 96 assert(pioSize != 0); 97 range_list.clear(); 98 range_list.push_back(RangeSize(pioAddr, pioSize)); 99} 100 101 102DmaPort::DmaPort(MemObject *dev, System *s, Tick min_backoff, Tick max_backoff) 103 : Port(dev->name() + "-dmaport", dev), device(dev), sys(s), 104 pendingCount(0), actionInProgress(0), drainEvent(NULL), 105 backoffTime(0), minBackoffDelay(min_backoff), 106 maxBackoffDelay(max_backoff), inRetry(false), backoffEvent(this) 107{ } 108 109bool 110DmaPort::recvTiming(PacketPtr pkt) 111{ 112 if (pkt->wasNacked()) { 113 DPRINTF(DMA, "Received nacked %s addr %#x\n", 114 pkt->cmdString(), pkt->getAddr()); 115 116 if (backoffTime < minBackoffDelay) 117 backoffTime = minBackoffDelay; 118 else if (backoffTime < maxBackoffDelay) 119 backoffTime <<= 1; 120 121 reschedule(backoffEvent, curTick + backoffTime, true); 122 123 DPRINTF(DMA, "Backoff time set to %d ticks\n", backoffTime); 124 125 pkt->reinitNacked(); 126 queueDma(pkt, true); 127 } else if (pkt->senderState) { 128 DmaReqState *state; 129 backoffTime >>= 2; 130 131 DPRINTF(DMA, "Received response %s addr %#x size %#x\n", 132 pkt->cmdString(), pkt->getAddr(), pkt->req->getSize()); 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 assert(state->totBytes >= state->numBytes); 141 if (state->totBytes == state->numBytes) { 142 if (state->completionEvent) { 143 if (state->delay) 144 schedule(state->completionEvent, curTick + state->delay); 145 else 146 state->completionEvent->process(); 147 } 148 delete state; 149 } 150 delete pkt->req; 151 delete pkt; 152 153 if (pendingCount == 0 && drainEvent) { 154 drainEvent->process(); 155 drainEvent = NULL; 156 } 157 } else { 158 panic("Got packet without sender state... huh?\n"); 159 } 160 161 return true; 162} 163 164DmaDevice::DmaDevice(const Params *p) 165 : PioDevice(p), dmaPort(NULL) 166{ } 167 168 169unsigned int 170DmaDevice::drain(Event *de) 171{ 172 unsigned int count; 173 count = pioPort->drain(de) + dmaPort->drain(de); 174 if (count) 175 changeState(Draining); 176 else 177 changeState(Drained); 178 return count; 179} 180 181unsigned int 182DmaPort::drain(Event *de) 183{ 184 if (pendingCount == 0) 185 return 0; 186 drainEvent = de; 187 return 1; 188} 189 190 191void 192DmaPort::recvRetry() 193{ 194 assert(transmitList.size()); 195 bool result = true; 196 do { 197 PacketPtr pkt = transmitList.front(); 198 DPRINTF(DMA, "Retry on %s addr %#x\n", 199 pkt->cmdString(), pkt->getAddr()); 200 result = sendTiming(pkt); 201 if (result) { 202 DPRINTF(DMA, "-- Done\n"); 203 transmitList.pop_front(); 204 inRetry = false; 205 } else { 206 inRetry = true; 207 DPRINTF(DMA, "-- Failed, queued\n"); 208 } 209 } while (!backoffTime && result && transmitList.size()); 210 211 if (transmitList.size() && backoffTime && !inRetry) { 212 DPRINTF(DMA, "Scheduling backoff for %d\n", curTick+backoffTime); 213 if (!backoffEvent.scheduled()) 214 schedule(backoffEvent, backoffTime + curTick); 215 } 216 DPRINTF(DMA, "TransmitList: %d, backoffTime: %d inRetry: %d es: %d\n", 217 transmitList.size(), backoffTime, inRetry, 218 backoffEvent.scheduled()); 219} 220 221 222void 223DmaPort::dmaAction(Packet::Command cmd, Addr addr, int size, Event *event, 224 uint8_t *data, Tick delay) 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 schedule(backoffEvent, 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, 317 state->completionEvent ? state->completionEvent->scheduled() : 0 ); 318 319 if (state->totBytes == state->numBytes) { 320 if (state->completionEvent) { 321 assert(!state->completionEvent->scheduled()); 322 schedule(state->completionEvent, curTick + lat + state->delay); 323 } 324 delete state; 325 delete pkt->req; 326 } 327 pendingCount--; 328 assert(pendingCount >= 0); 329 delete pkt; 330 331 if (pendingCount == 0 && drainEvent) { 332 drainEvent->process(); 333 drainEvent = NULL; 334 } 335 336 } else 337 panic("Unknown memory command state."); 338} 339 340DmaDevice::~DmaDevice() 341{ 342 if (dmaPort) 343 delete dmaPort; 344} 345