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  * Authors: Ali Saidi
  29  *          Nathan Binkert
  30  */
  31
  32 #include "base/trace.hh"
  33 #include "dev/io_device.hh"
  34 #include "sim/builder.hh"
  35
  36
  37 PioPort::PioPort(PioDevice *dev, Platform *p)
  38     : Port(dev->name() + "-pioport"), device(dev), platform(p)
  39 { }
  40
  41
  42 Tick
  43 PioPort::recvAtomic(Packet *pkt)
  44 {
  45     return device->recvAtomic(pkt);
  46 }
  47
  48 void
  49 PioPort::recvFunctional(Packet *pkt)
  50 {
  51     device->recvAtomic(pkt);
  52 }
  53
  54 void
  55 PioPort::getDeviceAddressRanges(AddrRangeList &resp, AddrRangeList &snoop)
  56 {
  57     snoop.clear();
  58     device->addressRanges(resp);
  59 }
  60
  61
  62 void
  63 PioPort::recvRetry()
  64 {
  65     Packet* pkt = transmitList.front();
  66     if (Port::sendTiming(pkt)) {
  67         transmitList.pop_front();
  68     }
  69 }
  70
  71
  72 void
  73 PioPort::SendEvent::process()
  74 {
  75     if (port->Port::sendTiming(packet))
  76         return;
  77
  78     port->transmitList.push_back(packet);
  79 }
  80
  81
  82
  83 bool
  84 PioPort::recvTiming(Packet *pkt)
  85 {
  86     Tick latency = device->recvAtomic(pkt);
  87     // turn packet around to go back to requester
  88     pkt->makeTimingResponse();
  89     sendTiming(pkt, latency);
  90     return true;
  91 }
  92
  93 PioDevice::~PioDevice()
  94 {
  95     if (pioPort)
  96         delete pioPort;
  97 }
  98
  99 void
 100 PioDevice::init()
 101 {
 102     if (!pioPort)
 103         panic("Pio port not connected to anything!");
 104     pioPort->sendStatusChange(Port::RangeChange);
 105 }
 106
 107 void
 108 BasicPioDevice::addressRanges(AddrRangeList &range_list)
 109 {
 110     assert(pioSize != 0);
 111     range_list.clear();
 112     range_list.push_back(RangeSize(pioAddr, pioSize));
 113 }
 114
 115
 116 DmaPort::DmaPort(DmaDevice *dev, Platform *p)
 117     : Port(dev->name() + "-dmaport"), device(dev), platform(p), pendingCount(0)
 118 { }
 119
 120 bool
 121 DmaPort::recvTiming(Packet *pkt)
 122 {
 123
 124
 125     if (pkt->result == Packet::Nacked) {
 126         DPRINTF(DMA, "Received nacked Pkt %#x with State: %#x Addr: %#x\n",
 127                pkt, pkt->senderState, pkt->getAddr());
 128         pkt->reinitNacked();
 129         sendDma(pkt, true);
 130     } else if (pkt->senderState) {
 131         DmaReqState *state;
 132         DPRINTF(DMA, "Received response Pkt %#x with State: %#x Addr: %#x\n",
 133                pkt, pkt->senderState, pkt->getAddr());
 134         state = dynamic_cast<DmaReqState*>(pkt->senderState);
 135         pendingCount--;
 136
 137         assert(pendingCount >= 0);
 138         assert(state);
 139
 140         state->numBytes += pkt->req->getSize();
 141         if (state->totBytes == state->numBytes) {
 142             state->completionEvent->process();
 143             delete state;
 144         }
 145         delete pkt->req;
 146         delete pkt;
 147     }  else {
 148         panic("Got packet without sender state... huh?\n");
 149     }
 150
 151     return true;
 152 }
 153
 154 DmaDevice::DmaDevice(Params *p)
 155     : PioDevice(p), dmaPort(NULL)
 156 { }
 157
 158 void
 159 DmaPort::recvRetry()
 160 {
 161     Packet* pkt = transmitList.front();
 162     bool result = true;
 163     while (result && transmitList.size()) {
 164         DPRINTF(DMA, "Retry on  Packet %#x with senderState: %#x\n",
 165                    pkt, pkt->senderState);
 166         result = sendTiming(pkt);
 167         if (result) {
 168             DPRINTF(DMA, "-- Done\n");
 169             transmitList.pop_front();
 170         } else {
 171             DPRINTF(DMA, "-- Failed, queued\n");
 172         }
 173     }
 174 }
 175
 176
 177 void
 178 DmaPort::dmaAction(Packet::Command cmd, Addr addr, int size, Event *event,
 179                    uint8_t *data)
 180 {
 181     assert(event);
 182
 183     DmaReqState *reqState = new DmaReqState(event, this, size);
 184
 185     for (ChunkGenerator gen(addr, size, peerBlockSize());
 186          !gen.done(); gen.next()) {
 187             Request *req = new Request(gen.addr(), gen.size(), 0);
 188             Packet *pkt = new Packet(req, cmd, Packet::Broadcast);
 189
 190             // Increment the data pointer on a write
 191             if (data)
 192                 pkt->dataStatic(data + gen.complete());
 193
 194             pkt->senderState = reqState;
 195
 196             assert(pendingCount >= 0);
 197             pendingCount++;
 198             sendDma(pkt);
 199     }
 200 }
 201
 202
 203 void
 204 DmaPort::sendDma(Packet *pkt, bool front)
 205 {
 206    // some kind of selction between access methods
 207    // more work is going to have to be done to make
 208    // switching actually work
 209   /* MemState state = device->platform->system->memState;
 210
 211    if (state == Timing) {  */
 212        DPRINTF(DMA, "Attempting to send Packet %#x with addr: %#x\n",
 213                pkt, pkt->getAddr());
 214        if (transmitList.size() || !sendTiming(pkt)) {
 215            if (front)
 216                transmitList.push_front(pkt);
 217            else
 218                transmitList.push_back(pkt);
 219            DPRINTF(DMA, "-- Failed: queued\n");
 220        } else {
 221            DPRINTF(DMA, "-- Done\n");
 222        }
 223   /*  } else if (state == Atomic) {
 224        sendAtomic(pkt);
 225        if (pkt->senderState) {
 226            DmaReqState *state = dynamic_cast<DmaReqState*>(pkt->senderState);
 227            assert(state);
 228            state->completionEvent->schedule(curTick + (pkt->time -
 229            pkt->req->getTime()) +1);
 230            delete state;
 231        }
 232        pendingCount--;
 233        assert(pendingCount >= 0);
 234        delete pkt->req;
 235        delete pkt;
 236
 237    } else if (state == Functional) {
 238        sendFunctional(pkt);
 239        // Is this correct???
 240        completionEvent->schedule(pkt->req->responseTime - pkt->req->requestTime);
 241        completionEvent == NULL;
 242    } else
 243        panic("Unknown memory command state.");
 244   */
 245 }
 246
 247 DmaDevice::~DmaDevice()
 248 {
 249     if (dmaPort)
 250         delete dmaPort;
 251 }
 252
 253