src/dev/io_device.cc

   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
  29 #include "base/trace.hh"
  30 #include "dev/io_device.hh"
  31 #include "sim/builder.hh"
  32
  33
  34 PioPort::PioPort(PioDevice *dev, Platform *p)
  35     : Port(dev->name() + "-pioport"), device(dev), platform(p)
  36 { }
  37
  38
  39 Tick
  40 PioPort::recvAtomic(Packet *pkt)
  41 {
  42     return device->recvAtomic(pkt);
  43 }
  44
  45 void
  46 PioPort::recvFunctional(Packet *pkt)
  47 {
  48     device->recvAtomic(pkt);
  49 }
  50
  51 void
  52 PioPort::getDeviceAddressRanges(AddrRangeList &resp, AddrRangeList &snoop)
  53 {
  54     snoop.clear();
  55     device->addressRanges(resp);
  56 }
  57
  58
  59 void
  60 PioPort::recvRetry()
  61 {
  62     Packet* pkt = transmitList.front();
  63     if (Port::sendTiming(pkt)) {
  64         transmitList.pop_front();
  65     }
  66 }
  67
  68
  69 void
  70 PioPort::SendEvent::process()
  71 {
  72     if (port->Port::sendTiming(packet))
  73         return;
  74
  75     port->transmitList.push_back(packet);
  76 }
  77
  78
  79
  80 bool
  81 PioPort::recvTiming(Packet *pkt)
  82 {
  83     Tick latency = device->recvAtomic(pkt);
  84     // turn packet around to go back to requester
  85     pkt->makeTimingResponse();
  86     sendTiming(pkt, latency);
  87     return true;
  88 }
  89
  90 PioDevice::~PioDevice()
  91 {
  92     if (pioPort)
  93         delete pioPort;
  94 }
  95
  96 void
  97 PioDevice::init()
  98 {
  99     if (!pioPort)
 100         panic("Pio port not connected to anything!");
 101     pioPort->sendStatusChange(Port::RangeChange);
 102 }
 103
 104 void
 105 BasicPioDevice::addressRanges(AddrRangeList &range_list)
 106 {
 107     assert(pioSize != 0);
 108     range_list.clear();
 109     range_list.push_back(RangeSize(pioAddr, pioSize));
 110 }
 111
 112
 113 DmaPort::DmaPort(DmaDevice *dev, Platform *p)
 114     : Port(dev->name() + "-dmaport"), device(dev), platform(p), pendingCount(0)
 115 { }
 116
 117 bool
 118 DmaPort::recvTiming(Packet *pkt)
 119 {
 120     if (pkt->senderState) {
 121         DmaReqState *state;
 122         DPRINTF(DMA, "Received response Packet %#x with senderState: %#x\n",
 123                pkt, pkt->senderState);
 124         state = dynamic_cast<DmaReqState*>(pkt->senderState);
 125         assert(state);
 126         state->completionEvent->process();
 127         delete pkt->req;
 128         delete pkt;
 129     }  else {
 130         DPRINTF(DMA, "Received response Packet %#x with no senderState\n", pkt);
 131         delete pkt->req;
 132         delete pkt;
 133     }
 134
 135     return true;
 136 }
 137
 138 DmaDevice::DmaDevice(Params *p)
 139     : PioDevice(p), dmaPort(NULL)
 140 { }
 141
 142 void
 143 DmaPort::recvRetry()
 144 {
 145     Packet* pkt = transmitList.front();
 146     DPRINTF(DMA, "Retry on  Packet %#x with senderState: %#x\n",
 147                pkt, pkt->senderState);
 148     if (sendTiming(pkt)) {
 149         DPRINTF(DMA, "-- Done\n");
 150         transmitList.pop_front();
 151         pendingCount--;
 152         assert(pendingCount >= 0);
 153     } else {
 154         DPRINTF(DMA, "-- Failed, queued\n");
 155     }
 156 }
 157
 158
 159 void
 160 DmaPort::dmaAction(Packet::Command cmd, Addr addr, int size, Event *event,
 161                    uint8_t *data)
 162 {
 163     assert(event);
 164
 165     int prevSize = 0;
 166
 167     for (ChunkGenerator gen(addr, size, peerBlockSize());
 168          !gen.done(); gen.next()) {
 169             Request *req = new Request(gen.addr(), gen.size(), 0);
 170             Packet *pkt = new Packet(req, cmd, Packet::Broadcast);
 171
 172             // Increment the data pointer on a write
 173             if (data)
 174                 pkt->dataStatic(data + prevSize);
 175
 176             prevSize += gen.size();
 177
 178             // Set the last bit of the dma as the final packet for this dma
 179             // and set it's completion event.
 180             if (prevSize == size) {
 181                 pkt->senderState = new DmaReqState(event, true);
 182             }
 183             assert(pendingCount >= 0);
 184             pendingCount++;
 185             sendDma(pkt);
 186     }
 187 }
 188
 189
 190 void
 191 DmaPort::sendDma(Packet *pkt)
 192 {
 193    // some kind of selction between access methods
 194    // more work is going to have to be done to make
 195    // switching actually work
 196   /* MemState state = device->platform->system->memState;
 197
 198    if (state == Timing) {  */
 199        DPRINTF(DMA, "Attempting to send Packet %#x with senderState: %#x\n",
 200                pkt, pkt->senderState);
 201        if (!sendTiming(pkt)) {
 202            transmitList.push_back(pkt);
 203            DPRINTF(DMA, "-- Failed: queued\n");
 204        } else {
 205            DPRINTF(DMA, "-- Done\n");
 206            pendingCount--;
 207            assert(pendingCount >= 0);
 208        }
 209   /*  } else if (state == Atomic) {
 210        sendAtomic(pkt);
 211        if (pkt->senderState) {
 212            DmaReqState *state = dynamic_cast<DmaReqState*>(pkt->senderState);
 213            assert(state);
 214            state->completionEvent->schedule(curTick + (pkt->time - pkt->req->getTime()) +1);
 215        }
 216        pendingCount--;
 217        assert(pendingCount >= 0);
 218        delete pkt->req;
 219        delete pkt;
 220
 221    } else if (state == Functional) {
 222        sendFunctional(pkt);
 223        // Is this correct???
 224        completionEvent->schedule(pkt->req->responseTime - pkt->req->requestTime);
 225        completionEvent == NULL;
 226    } else
 227        panic("Unknown memory command state.");
 228   */
 229 }
 230
 231 DmaDevice::~DmaDevice()
 232 {
 233     if (dmaPort)
 234         delete dmaPort;
 235 }
 236
 237