io_device.cc revision 5606
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(DmaDevice *dev, System *s) 103 : Port(dev->name() + "-dmaport", dev), device(dev), sys(s), 104 pendingCount(0), actionInProgress(0), drainEvent(NULL), 105 backoffTime(0), inRetry(false), backoffEvent(this) 106{ } 107 108bool 109DmaPort::recvTiming(PacketPtr pkt) 110{ 111 if (pkt->wasNacked()) { 112 DPRINTF(DMA, "Received nacked %s addr %#x\n", 113 pkt->cmdString(), pkt->getAddr()); 114 115 if (backoffTime < device->minBackoffDelay) 116 backoffTime = device->minBackoffDelay; 117 else if (backoffTime < device->maxBackoffDelay) 118 backoffTime <<= 1; 119 120 reschedule(backoffEvent, curTick + backoffTime, true); 121 122 DPRINTF(DMA, "Backoff time set to %d ticks\n", backoffTime); 123 124 pkt->reinitNacked(); 125 queueDma(pkt, true); 126 } else if (pkt->senderState) { 127 DmaReqState *state; 128 backoffTime >>= 2; 129 130 DPRINTF(DMA, "Received response %s addr %#x size %#x\n", 131 pkt->cmdString(), pkt->getAddr(), pkt->req->getSize()); 132 state = dynamic_cast<DmaReqState*>(pkt->senderState); 133 pendingCount--; 134 135 assert(pendingCount >= 0); 136 assert(state); 137 138 state->numBytes += pkt->req->getSize(); 139 assert(state->totBytes >= state->numBytes); 140 if (state->totBytes == state->numBytes) { 141 if (state->delay) 142 schedule(state->completionEvent, curTick + state->delay); 143 else 144 state->completionEvent->process(); 145 delete state; 146 } 147 delete pkt->req; 148 delete pkt; 149 150 if (pendingCount == 0 && drainEvent) { 151 drainEvent->process(); 152 drainEvent = NULL; 153 } 154 } else { 155 panic("Got packet without sender state... huh?\n"); 156 } 157 158 return true; 159} 160 161DmaDevice::DmaDevice(const Params *p) 162 : PioDevice(p), dmaPort(NULL), minBackoffDelay(p->min_backoff_delay), 163 maxBackoffDelay(p->max_backoff_delay) 164{ } 165 166 167unsigned int 168DmaDevice::drain(Event *de) 169{ 170 unsigned int count; 171 count = pioPort->drain(de) + dmaPort->drain(de); 172 if (count) 173 changeState(Draining); 174 else 175 changeState(Drained); 176 return count; 177} 178 179unsigned int 180DmaPort::drain(Event *de) 181{ 182 if (pendingCount == 0) 183 return 0; 184 drainEvent = de; 185 return 1; 186} 187 188 189void 190DmaPort::recvRetry() 191{ 192 assert(transmitList.size()); 193 bool result = true; 194 do { 195 PacketPtr pkt = transmitList.front(); 196 DPRINTF(DMA, "Retry on %s addr %#x\n", 197 pkt->cmdString(), pkt->getAddr()); 198 result = sendTiming(pkt); 199 if (result) { 200 DPRINTF(DMA, "-- Done\n"); 201 transmitList.pop_front(); 202 inRetry = false; 203 } else { 204 inRetry = true; 205 DPRINTF(DMA, "-- Failed, queued\n"); 206 } 207 } while (!backoffTime && result && transmitList.size()); 208 209 if (transmitList.size() && backoffTime && !inRetry) { 210 DPRINTF(DMA, "Scheduling backoff for %d\n", curTick+backoffTime); 211 if (!backoffEvent.scheduled()) 212 schedule(backoffEvent, backoffTime + curTick); 213 } 214 DPRINTF(DMA, "TransmitList: %d, backoffTime: %d inRetry: %d es: %d\n", 215 transmitList.size(), backoffTime, inRetry, 216 backoffEvent.scheduled()); 217} 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 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, state->completionEvent->scheduled()); 317 318 if (state->totBytes == state->numBytes) { 319 assert(!state->completionEvent->scheduled()); 320 schedule(state->completionEvent, 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