io_device.cc revision 3401
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, dev), device(dev) 41{ } 42 43 44Tick 45PioPort::recvAtomic(PacketPtr pkt) 46{ 47 return pkt->isRead() ? device->read(pkt) : device->write(pkt); 48} 49 50void 51PioPort::getDeviceAddressRanges(AddrRangeList &resp, AddrRangeList &snoop) 52{ 53 snoop.clear(); 54 device->addressRanges(resp); 55} 56 57 58PioDevice::~PioDevice() 59{ 60 if (pioPort) 61 delete pioPort; 62} 63 64void 65PioDevice::init() 66{ 67 if (!pioPort) 68 panic("Pio port not connected to anything!"); 69 pioPort->sendStatusChange(Port::RangeChange); 70} 71 72 73unsigned int 74PioDevice::drain(Event *de) 75{ 76 unsigned int count; 77 count = pioPort->drain(de); 78 if (count) 79 changeState(Draining); 80 else 81 changeState(Drained); 82 return count; 83} 84 85void 86BasicPioDevice::addressRanges(AddrRangeList &range_list) 87{ 88 assert(pioSize != 0); 89 range_list.clear(); 90 range_list.push_back(RangeSize(pioAddr, pioSize)); 91} 92 93 94DmaPort::DmaPort(DmaDevice *dev, System *s) 95 : Port(dev->name() + "-dmaport", dev), device(dev), sys(s), 96 pendingCount(0), actionInProgress(0), drainEvent(NULL) 97{ } 98 99bool 100DmaPort::recvTiming(PacketPtr pkt) 101{ 102 103 104 if (pkt->result == Packet::Nacked) { 105 DPRINTF(DMA, "Received nacked Pkt %#x with State: %#x Addr: %#x\n", 106 pkt, pkt->senderState, pkt->getAddr()); 107 pkt->reinitNacked(); 108 sendDma(pkt, true); 109 } else if (pkt->senderState) { 110 DmaReqState *state; 111 DPRINTF(DMA, "Received response Pkt %#x with State: %#x Addr: %#x\n", 112 pkt, pkt->senderState, pkt->getAddr()); 113 state = dynamic_cast<DmaReqState*>(pkt->senderState); 114 pendingCount--; 115 116 assert(pendingCount >= 0); 117 assert(state); 118 119 state->numBytes += pkt->req->getSize(); 120 if (state->totBytes == state->numBytes) { 121 state->completionEvent->process(); 122 delete state; 123 } 124 delete pkt->req; 125 delete pkt; 126 127 if (pendingCount == 0 && drainEvent) { 128 drainEvent->process(); 129 drainEvent = NULL; 130 } 131 } else { 132 panic("Got packet without sender state... huh?\n"); 133 } 134 135 return true; 136} 137 138DmaDevice::DmaDevice(Params *p) 139 : PioDevice(p), dmaPort(NULL) 140{ } 141 142 143unsigned int 144DmaDevice::drain(Event *de) 145{ 146 unsigned int count; 147 count = pioPort->drain(de) + dmaPort->drain(de); 148 if (count) 149 changeState(Draining); 150 else 151 changeState(Drained); 152 return count; 153} 154 155unsigned int 156DmaPort::drain(Event *de) 157{ 158 if (pendingCount == 0) 159 return 0; 160 drainEvent = de; 161 return 1; 162} 163 164 165void 166DmaPort::recvRetry() 167{ 168 PacketPtr pkt = transmitList.front(); 169 bool result = true; 170 while (result && transmitList.size()) { 171 DPRINTF(DMA, "Retry on Packet %#x with senderState: %#x\n", 172 pkt, pkt->senderState); 173 result = sendTiming(pkt); 174 if (result) { 175 DPRINTF(DMA, "-- Done\n"); 176 transmitList.pop_front(); 177 } else { 178 DPRINTF(DMA, "-- Failed, queued\n"); 179 } 180 } 181} 182 183 184void 185DmaPort::dmaAction(Packet::Command cmd, Addr addr, int size, Event *event, 186 uint8_t *data) 187{ 188 assert(event); 189 190 assert(device->getState() == SimObject::Running); 191 192 DmaReqState *reqState = new DmaReqState(event, this, size); 193 194 for (ChunkGenerator gen(addr, size, peerBlockSize()); 195 !gen.done(); gen.next()) { 196 Request *req = new Request(gen.addr(), gen.size(), 0); 197 PacketPtr pkt = new Packet(req, cmd, Packet::Broadcast); 198 199 // Increment the data pointer on a write 200 if (data) 201 pkt->dataStatic(data + gen.complete()); 202 203 pkt->senderState = reqState; 204 205 assert(pendingCount >= 0); 206 pendingCount++; 207 sendDma(pkt); 208 } 209 210} 211 212 213void 214DmaPort::sendDma(PacketPtr pkt, bool front) 215{ 216 // some kind of selction between access methods 217 // more work is going to have to be done to make 218 // switching actually work 219 220 System::MemoryMode state = sys->getMemoryMode(); 221 if (state == System::Timing) { 222 DPRINTF(DMA, "Attempting to send Packet %#x with addr: %#x\n", 223 pkt, pkt->getAddr()); 224 if (transmitList.size() || !sendTiming(pkt)) { 225 if (front) 226 transmitList.push_front(pkt); 227 else 228 transmitList.push_back(pkt); 229 DPRINTF(DMA, "-- Failed: queued\n"); 230 } else { 231 DPRINTF(DMA, "-- Done\n"); 232 } 233 } else if (state == System::Atomic) { 234 Tick lat; 235 lat = sendAtomic(pkt); 236 assert(pkt->senderState); 237 DmaReqState *state = dynamic_cast<DmaReqState*>(pkt->senderState); 238 assert(state); 239 240 state->numBytes += pkt->req->getSize(); 241 if (state->totBytes == state->numBytes) { 242 state->completionEvent->schedule(curTick + lat); 243 delete state; 244 delete pkt->req; 245 } 246 pendingCount--; 247 assert(pendingCount >= 0); 248 delete pkt; 249 250 if (pendingCount == 0 && drainEvent) { 251 drainEvent->process(); 252 drainEvent = NULL; 253 } 254 255 } else 256 panic("Unknown memory command state."); 257} 258 259DmaDevice::~DmaDevice() 260{ 261 if (dmaPort) 262 delete dmaPort; 263} 264 265 266