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 "debug/BusAddrRanges.hh" 35#include "debug/DMA.hh" 36#include "dev/io_device.hh" 37#include "sim/system.hh" 38 39PioPort::PioPort(PioDevice *dev, System *s, std::string pname) 40 : SimpleTimingPort(dev->name() + pname, dev), device(dev) 41{ } 42 43 44Tick 45PioPort::recvAtomic(PacketPtr pkt) 46{ 47 return pkt->isRead() ? device->read(pkt) : device->write(pkt); 48} 49
| 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 "debug/BusAddrRanges.hh" 35#include "debug/DMA.hh" 36#include "dev/io_device.hh" 37#include "sim/system.hh" 38 39PioPort::PioPort(PioDevice *dev, System *s, std::string pname) 40 : SimpleTimingPort(dev->name() + pname, dev), device(dev) 41{ } 42 43 44Tick 45PioPort::recvAtomic(PacketPtr pkt) 46{ 47 return pkt->isRead() ? device->read(pkt) : device->write(pkt); 48} 49
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50AddrRangeList 51PioPort::getAddrRanges()
| 50void 51PioPort::getDeviceAddressRanges(AddrRangeList &resp, bool &snoop)
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52{
| 52{
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53 return device->getAddrRanges();
| 53 snoop = false; 54 device->addressRanges(resp); 55 for (AddrRangeIter i = resp.begin(); i != resp.end(); i++) 56 DPRINTF(BusAddrRanges, "Adding Range %#x-%#x\n", i->start, i->end);
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54} 55 56 57PioDevice::PioDevice(const Params *p)
| 57} 58 59 60PioDevice::PioDevice(const Params *p)
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58 : MemObject(p), platform(p->platform), sys(p->system), pioPort(NULL)
| 61 : MemObject(p), sys(p->system), pioPort(NULL)
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59{} 60 61PioDevice::~PioDevice() 62{ 63 if (pioPort) 64 delete pioPort; 65} 66 67void 68PioDevice::init() 69{ 70 if (!pioPort)
| 62{} 63 64PioDevice::~PioDevice() 65{ 66 if (pioPort) 67 delete pioPort; 68} 69 70void 71PioDevice::init() 72{ 73 if (!pioPort)
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71 panic("Pio port of %s not connected to anything!", name()); 72 pioPort->sendRangeChange();
| 74 panic("Pio port not connected to anything!"); 75 pioPort->sendStatusChange(Port::RangeChange);
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73} 74
| 76} 77
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75Port * 76PioDevice::getPort(const std::string &if_name, int idx) 77{ 78 if (if_name == "pio") { 79 if (pioPort != NULL) 80 fatal("%s: pio port already connected to %s", 81 name(), pioPort->getPeer()->name()); 82 pioPort = new PioPort(this, sys); 83 return pioPort; 84 } 85 return NULL; 86}
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87 88unsigned int 89PioDevice::drain(Event *de) 90{ 91 unsigned int count; 92 count = pioPort->drain(de); 93 if (count) 94 changeState(Draining); 95 else 96 changeState(Drained); 97 return count; 98} 99 100BasicPioDevice::BasicPioDevice(const Params *p) 101 : PioDevice(p), pioAddr(p->pio_addr), pioSize(0), 102 pioDelay(p->pio_latency) 103{} 104
| 78 79unsigned int 80PioDevice::drain(Event *de) 81{ 82 unsigned int count; 83 count = pioPort->drain(de); 84 if (count) 85 changeState(Draining); 86 else 87 changeState(Drained); 88 return count; 89} 90 91BasicPioDevice::BasicPioDevice(const Params *p) 92 : PioDevice(p), pioAddr(p->pio_addr), pioSize(0), 93 pioDelay(p->pio_latency) 94{} 95
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105AddrRangeList 106BasicPioDevice::getAddrRanges()
| 96void 97BasicPioDevice::addressRanges(AddrRangeList &range_list)
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107{ 108 assert(pioSize != 0);
| 98{ 99 assert(pioSize != 0);
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109 AddrRangeList ranges;
| 100 range_list.clear();
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110 DPRINTF(BusAddrRanges, "registering range: %#x-%#x\n", pioAddr, pioSize);
| 101 DPRINTF(BusAddrRanges, "registering range: %#x-%#x\n", pioAddr, pioSize);
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111 ranges.push_back(RangeSize(pioAddr, pioSize)); 112 return ranges;
| 102 range_list.push_back(RangeSize(pioAddr, pioSize));
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113} 114 115
| 103} 104 105
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116DmaPort::DmaPort(MemObject *dev, System *s, Tick min_backoff, Tick max_backoff, 117 bool recv_snoops)
| 106DmaPort::DmaPort(MemObject *dev, System *s, Tick min_backoff, Tick max_backoff)
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118 : Port(dev->name() + "-dmaport", dev), device(dev), sys(s), 119 pendingCount(0), actionInProgress(0), drainEvent(NULL), 120 backoffTime(0), minBackoffDelay(min_backoff),
| 107 : Port(dev->name() + "-dmaport", dev), device(dev), sys(s), 108 pendingCount(0), actionInProgress(0), drainEvent(NULL), 109 backoffTime(0), minBackoffDelay(min_backoff),
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121 maxBackoffDelay(max_backoff), inRetry(false), recvSnoops(recv_snoops), 122 backoffEvent(this)
| 110 maxBackoffDelay(max_backoff), inRetry(false), backoffEvent(this)
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123{ } 124 125bool 126DmaPort::recvTiming(PacketPtr pkt) 127{ 128 if (pkt->wasNacked()) { 129 DPRINTF(DMA, "Received nacked %s addr %#x\n", 130 pkt->cmdString(), pkt->getAddr()); 131 132 if (backoffTime < minBackoffDelay) 133 backoffTime = minBackoffDelay; 134 else if (backoffTime < maxBackoffDelay) 135 backoffTime <<= 1; 136
| 111{ } 112 113bool 114DmaPort::recvTiming(PacketPtr pkt) 115{ 116 if (pkt->wasNacked()) { 117 DPRINTF(DMA, "Received nacked %s addr %#x\n", 118 pkt->cmdString(), pkt->getAddr()); 119 120 if (backoffTime < minBackoffDelay) 121 backoffTime = minBackoffDelay; 122 else if (backoffTime < maxBackoffDelay) 123 backoffTime <<= 1; 124
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137 device->reschedule(backoffEvent, curTick() + backoffTime, true);
| 125 reschedule(backoffEvent, curTick() + backoffTime, true);
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138 139 DPRINTF(DMA, "Backoff time set to %d ticks\n", backoffTime); 140 141 pkt->reinitNacked(); 142 queueDma(pkt, true);
| 126 127 DPRINTF(DMA, "Backoff time set to %d ticks\n", backoffTime); 128 129 pkt->reinitNacked(); 130 queueDma(pkt, true);
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143 } else if (pkt->isRequest() && recvSnoops) { 144 return true;
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145 } else if (pkt->senderState) { 146 DmaReqState *state; 147 backoffTime >>= 2; 148 149 DPRINTF(DMA, "Received response %s addr %#x size %#x\n", 150 pkt->cmdString(), pkt->getAddr(), pkt->req->getSize()); 151 state = dynamic_cast<DmaReqState*>(pkt->senderState); 152 pendingCount--; 153 154 assert(pendingCount >= 0); 155 assert(state); 156 157 // We shouldn't ever get a block in ownership state 158 assert(!(pkt->memInhibitAsserted() && !pkt->sharedAsserted())); 159 160 state->numBytes += pkt->req->getSize(); 161 assert(state->totBytes >= state->numBytes); 162 if (state->totBytes == state->numBytes) { 163 if (state->completionEvent) { 164 if (state->delay)
| 131 } else if (pkt->senderState) { 132 DmaReqState *state; 133 backoffTime >>= 2; 134 135 DPRINTF(DMA, "Received response %s addr %#x size %#x\n", 136 pkt->cmdString(), pkt->getAddr(), pkt->req->getSize()); 137 state = dynamic_cast<DmaReqState*>(pkt->senderState); 138 pendingCount--; 139 140 assert(pendingCount >= 0); 141 assert(state); 142 143 // We shouldn't ever get a block in ownership state 144 assert(!(pkt->memInhibitAsserted() && !pkt->sharedAsserted())); 145 146 state->numBytes += pkt->req->getSize(); 147 assert(state->totBytes >= state->numBytes); 148 if (state->totBytes == state->numBytes) { 149 if (state->completionEvent) { 150 if (state->delay)
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165 device->schedule(state->completionEvent, 166 curTick() + state->delay);
| 151 schedule(state->completionEvent, curTick() + state->delay);
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167 else 168 state->completionEvent->process(); 169 } 170 delete state; 171 } 172 delete pkt->req; 173 delete pkt; 174 175 if (pendingCount == 0 && drainEvent) { 176 drainEvent->process(); 177 drainEvent = NULL; 178 } 179 } else { 180 panic("Got packet without sender state... huh?\n"); 181 } 182 183 return true; 184} 185 186DmaDevice::DmaDevice(const Params *p) 187 : PioDevice(p), dmaPort(NULL) 188{ } 189 190 191unsigned int 192DmaDevice::drain(Event *de) 193{ 194 unsigned int count; 195 count = pioPort->drain(de) + dmaPort->drain(de); 196 if (count) 197 changeState(Draining); 198 else 199 changeState(Drained); 200 return count; 201} 202 203unsigned int 204DmaPort::drain(Event *de) 205{ 206 if (pendingCount == 0) 207 return 0; 208 drainEvent = de; 209 return 1; 210} 211 212 213void 214DmaPort::recvRetry() 215{ 216 assert(transmitList.size()); 217 bool result = true; 218 do { 219 PacketPtr pkt = transmitList.front(); 220 DPRINTF(DMA, "Retry on %s addr %#x\n", 221 pkt->cmdString(), pkt->getAddr()); 222 result = sendTiming(pkt); 223 if (result) { 224 DPRINTF(DMA, "-- Done\n"); 225 transmitList.pop_front(); 226 inRetry = false; 227 } else { 228 inRetry = true; 229 DPRINTF(DMA, "-- Failed, queued\n"); 230 } 231 } while (!backoffTime && result && transmitList.size()); 232 233 if (transmitList.size() && backoffTime && !inRetry) { 234 DPRINTF(DMA, "Scheduling backoff for %d\n", curTick()+backoffTime); 235 if (!backoffEvent.scheduled())
| 152 else 153 state->completionEvent->process(); 154 } 155 delete state; 156 } 157 delete pkt->req; 158 delete pkt; 159 160 if (pendingCount == 0 && drainEvent) { 161 drainEvent->process(); 162 drainEvent = NULL; 163 } 164 } else { 165 panic("Got packet without sender state... huh?\n"); 166 } 167 168 return true; 169} 170 171DmaDevice::DmaDevice(const Params *p) 172 : PioDevice(p), dmaPort(NULL) 173{ } 174 175 176unsigned int 177DmaDevice::drain(Event *de) 178{ 179 unsigned int count; 180 count = pioPort->drain(de) + dmaPort->drain(de); 181 if (count) 182 changeState(Draining); 183 else 184 changeState(Drained); 185 return count; 186} 187 188unsigned int 189DmaPort::drain(Event *de) 190{ 191 if (pendingCount == 0) 192 return 0; 193 drainEvent = de; 194 return 1; 195} 196 197 198void 199DmaPort::recvRetry() 200{ 201 assert(transmitList.size()); 202 bool result = true; 203 do { 204 PacketPtr pkt = transmitList.front(); 205 DPRINTF(DMA, "Retry on %s addr %#x\n", 206 pkt->cmdString(), pkt->getAddr()); 207 result = sendTiming(pkt); 208 if (result) { 209 DPRINTF(DMA, "-- Done\n"); 210 transmitList.pop_front(); 211 inRetry = false; 212 } else { 213 inRetry = true; 214 DPRINTF(DMA, "-- Failed, queued\n"); 215 } 216 } while (!backoffTime && result && transmitList.size()); 217 218 if (transmitList.size() && backoffTime && !inRetry) { 219 DPRINTF(DMA, "Scheduling backoff for %d\n", curTick()+backoffTime); 220 if (!backoffEvent.scheduled())
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236 device->schedule(backoffEvent, backoffTime + curTick());
| 221 schedule(backoffEvent, backoffTime + curTick());
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237 } 238 DPRINTF(DMA, "TransmitList: %d, backoffTime: %d inRetry: %d es: %d\n", 239 transmitList.size(), backoffTime, inRetry, 240 backoffEvent.scheduled()); 241} 242 243 244void 245DmaPort::dmaAction(Packet::Command cmd, Addr addr, int size, Event *event, 246 uint8_t *data, Tick delay, Request::Flags flag) 247{ 248 assert(device->getState() == SimObject::Running); 249 250 DmaReqState *reqState = new DmaReqState(event, this, size, delay); 251 252 253 DPRINTF(DMA, "Starting DMA for addr: %#x size: %d sched: %d\n", addr, size, 254 event ? event->scheduled() : -1 ); 255 for (ChunkGenerator gen(addr, size, peerBlockSize()); 256 !gen.done(); gen.next()) { 257 Request *req = new Request(gen.addr(), gen.size(), flag); 258 PacketPtr pkt = new Packet(req, cmd, Packet::Broadcast); 259 260 // Increment the data pointer on a write 261 if (data) 262 pkt->dataStatic(data + gen.complete()); 263 264 pkt->senderState = reqState; 265 266 assert(pendingCount >= 0); 267 pendingCount++; 268 DPRINTF(DMA, "--Queuing DMA for addr: %#x size: %d\n", gen.addr(), 269 gen.size()); 270 queueDma(pkt); 271 } 272 273} 274 275void 276DmaPort::queueDma(PacketPtr pkt, bool front) 277{ 278 279 if (front) 280 transmitList.push_front(pkt); 281 else 282 transmitList.push_back(pkt); 283 sendDma(); 284} 285 286 287void 288DmaPort::sendDma() 289{ 290 // some kind of selction between access methods 291 // more work is going to have to be done to make 292 // switching actually work 293 assert(transmitList.size()); 294 PacketPtr pkt = transmitList.front(); 295 296 Enums::MemoryMode state = sys->getMemoryMode(); 297 if (state == Enums::timing) { 298 if (backoffEvent.scheduled() || inRetry) { 299 DPRINTF(DMA, "Can't send immediately, waiting for retry or backoff timer\n"); 300 return; 301 } 302 303 DPRINTF(DMA, "Attempting to send %s addr %#x\n", 304 pkt->cmdString(), pkt->getAddr()); 305 306 bool result; 307 do { 308 result = sendTiming(pkt); 309 if (result) { 310 transmitList.pop_front(); 311 DPRINTF(DMA, "-- Done\n"); 312 } else { 313 inRetry = true; 314 DPRINTF(DMA, "-- Failed: queued\n"); 315 } 316 } while (result && !backoffTime && transmitList.size()); 317 318 if (transmitList.size() && backoffTime && !inRetry && 319 !backoffEvent.scheduled()) { 320 DPRINTF(DMA, "-- Scheduling backoff timer for %d\n", 321 backoffTime+curTick());
| 222 } 223 DPRINTF(DMA, "TransmitList: %d, backoffTime: %d inRetry: %d es: %d\n", 224 transmitList.size(), backoffTime, inRetry, 225 backoffEvent.scheduled()); 226} 227 228 229void 230DmaPort::dmaAction(Packet::Command cmd, Addr addr, int size, Event *event, 231 uint8_t *data, Tick delay, Request::Flags flag) 232{ 233 assert(device->getState() == SimObject::Running); 234 235 DmaReqState *reqState = new DmaReqState(event, this, size, delay); 236 237 238 DPRINTF(DMA, "Starting DMA for addr: %#x size: %d sched: %d\n", addr, size, 239 event ? event->scheduled() : -1 ); 240 for (ChunkGenerator gen(addr, size, peerBlockSize()); 241 !gen.done(); gen.next()) { 242 Request *req = new Request(gen.addr(), gen.size(), flag); 243 PacketPtr pkt = new Packet(req, cmd, Packet::Broadcast); 244 245 // Increment the data pointer on a write 246 if (data) 247 pkt->dataStatic(data + gen.complete()); 248 249 pkt->senderState = reqState; 250 251 assert(pendingCount >= 0); 252 pendingCount++; 253 DPRINTF(DMA, "--Queuing DMA for addr: %#x size: %d\n", gen.addr(), 254 gen.size()); 255 queueDma(pkt); 256 } 257 258} 259 260void 261DmaPort::queueDma(PacketPtr pkt, bool front) 262{ 263 264 if (front) 265 transmitList.push_front(pkt); 266 else 267 transmitList.push_back(pkt); 268 sendDma(); 269} 270 271 272void 273DmaPort::sendDma() 274{ 275 // some kind of selction between access methods 276 // more work is going to have to be done to make 277 // switching actually work 278 assert(transmitList.size()); 279 PacketPtr pkt = transmitList.front(); 280 281 Enums::MemoryMode state = sys->getMemoryMode(); 282 if (state == Enums::timing) { 283 if (backoffEvent.scheduled() || inRetry) { 284 DPRINTF(DMA, "Can't send immediately, waiting for retry or backoff timer\n"); 285 return; 286 } 287 288 DPRINTF(DMA, "Attempting to send %s addr %#x\n", 289 pkt->cmdString(), pkt->getAddr()); 290 291 bool result; 292 do { 293 result = sendTiming(pkt); 294 if (result) { 295 transmitList.pop_front(); 296 DPRINTF(DMA, "-- Done\n"); 297 } else { 298 inRetry = true; 299 DPRINTF(DMA, "-- Failed: queued\n"); 300 } 301 } while (result && !backoffTime && transmitList.size()); 302 303 if (transmitList.size() && backoffTime && !inRetry && 304 !backoffEvent.scheduled()) { 305 DPRINTF(DMA, "-- Scheduling backoff timer for %d\n", 306 backoffTime+curTick());
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322 device->schedule(backoffEvent, backoffTime + curTick());
| 307 schedule(backoffEvent, backoffTime + curTick());
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323 } 324 } else if (state == Enums::atomic) { 325 transmitList.pop_front(); 326 327 Tick lat; 328 DPRINTF(DMA, "--Sending DMA for addr: %#x size: %d\n", 329 pkt->req->getPaddr(), pkt->req->getSize()); 330 lat = sendAtomic(pkt); 331 assert(pkt->senderState); 332 DmaReqState *state = dynamic_cast<DmaReqState*>(pkt->senderState); 333 assert(state); 334 state->numBytes += pkt->req->getSize(); 335 336 DPRINTF(DMA, "--Received response for DMA for addr: %#x size: %d nb: %d, tot: %d sched %d\n", 337 pkt->req->getPaddr(), pkt->req->getSize(), state->numBytes, 338 state->totBytes, 339 state->completionEvent ? state->completionEvent->scheduled() : 0 ); 340 341 if (state->totBytes == state->numBytes) { 342 if (state->completionEvent) { 343 assert(!state->completionEvent->scheduled());
| 308 } 309 } else if (state == Enums::atomic) { 310 transmitList.pop_front(); 311 312 Tick lat; 313 DPRINTF(DMA, "--Sending DMA for addr: %#x size: %d\n", 314 pkt->req->getPaddr(), pkt->req->getSize()); 315 lat = sendAtomic(pkt); 316 assert(pkt->senderState); 317 DmaReqState *state = dynamic_cast<DmaReqState*>(pkt->senderState); 318 assert(state); 319 state->numBytes += pkt->req->getSize(); 320 321 DPRINTF(DMA, "--Received response for DMA for addr: %#x size: %d nb: %d, tot: %d sched %d\n", 322 pkt->req->getPaddr(), pkt->req->getSize(), state->numBytes, 323 state->totBytes, 324 state->completionEvent ? state->completionEvent->scheduled() : 0 ); 325 326 if (state->totBytes == state->numBytes) { 327 if (state->completionEvent) { 328 assert(!state->completionEvent->scheduled());
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344 device->schedule(state->completionEvent, 345 curTick() + lat + state->delay);
| 329 schedule(state->completionEvent, curTick() + lat + state->delay);
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346 } 347 delete state; 348 delete pkt->req; 349 } 350 pendingCount--; 351 assert(pendingCount >= 0); 352 delete pkt; 353 354 if (pendingCount == 0 && drainEvent) { 355 drainEvent->process(); 356 drainEvent = NULL; 357 } 358 359 } else 360 panic("Unknown memory command state."); 361} 362 363DmaDevice::~DmaDevice() 364{ 365 if (dmaPort) 366 delete dmaPort; 367}
| 330 } 331 delete state; 332 delete pkt->req; 333 } 334 pendingCount--; 335 assert(pendingCount >= 0); 336 delete pkt; 337 338 if (pendingCount == 0 && drainEvent) { 339 drainEvent->process(); 340 drainEvent = NULL; 341 } 342 343 } else 344 panic("Unknown memory command state."); 345} 346 347DmaDevice::~DmaDevice() 348{ 349 if (dmaPort) 350 delete dmaPort; 351}
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368 369 370Port * 371DmaDevice::getPort(const std::string &if_name, int idx) 372{ 373 if (if_name == "dma") { 374 if (dmaPort != NULL) 375 fatal("%s: dma port already connected to %s", 376 name(), dmaPort->getPeer()->name()); 377 dmaPort = new DmaPort(this, sys, params()->min_backoff_delay, 378 params()->max_backoff_delay); 379 return dmaPort; 380 } 381 return PioDevice::getPort(if_name, idx); 382} 383
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