io_device.cc revision 2665:a124942bacb8 
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
37PioPort::PioPort(PioDevice *dev, Platform *p)
38    : Port(dev->name() + "-pioport"), device(dev), platform(p)
39{ }
40
41
42Tick
43PioPort::recvAtomic(Packet *pkt)
44{
45    return device->recvAtomic(pkt);
46}
47
48void
49PioPort::recvFunctional(Packet *pkt)
50{
51    device->recvAtomic(pkt);
52}
53
54void
55PioPort::getDeviceAddressRanges(AddrRangeList &resp, AddrRangeList &snoop)
56{
57    snoop.clear();
58    device->addressRanges(resp);
59}
60
61
62void
63PioPort::recvRetry()
64{
65    Packet* pkt = transmitList.front();
66    if (Port::sendTiming(pkt)) {
67        transmitList.pop_front();
68    }
69}
70
71
72void
73PioPort::SendEvent::process()
74{
75    if (port->Port::sendTiming(packet))
76        return;
77
78    port->transmitList.push_back(packet);
79}
80
81
82
83bool
84PioPort::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
93PioDevice::~PioDevice()
94{
95    if (pioPort)
96        delete pioPort;
97}
98
99void
100PioDevice::init()
101{
102    if (!pioPort)
103        panic("Pio port not connected to anything!");
104    pioPort->sendStatusChange(Port::RangeChange);
105}
106
107void
108BasicPioDevice::addressRanges(AddrRangeList &range_list)
109{
110    assert(pioSize != 0);
111    range_list.clear();
112    range_list.push_back(RangeSize(pioAddr, pioSize));
113}
114
115
116DmaPort::DmaPort(DmaDevice *dev, Platform *p)
117    : Port(dev->name() + "-dmaport"), device(dev), platform(p), pendingCount(0)
118{ }
119
120bool
121DmaPort::recvTiming(Packet *pkt)
122{
123    if (pkt->senderState) {
124        DmaReqState *state;
125        DPRINTF(DMA, "Received response Packet %#x with senderState: %#x\n",
126               pkt, pkt->senderState);
127        state = dynamic_cast<DmaReqState*>(pkt->senderState);
128        assert(state);
129        state->completionEvent->process();
130        delete pkt->req;
131        delete pkt;
132    }  else {
133        DPRINTF(DMA, "Received response Packet %#x with no senderState\n", pkt);
134        delete pkt->req;
135        delete pkt;
136    }
137
138    return true;
139}
140
141DmaDevice::DmaDevice(Params *p)
142    : PioDevice(p), dmaPort(NULL)
143{ }
144
145void
146DmaPort::recvRetry()
147{
148    Packet* pkt = transmitList.front();
149    bool result = true;
150    while (result && transmitList.size()) {
151        DPRINTF(DMA, "Retry on  Packet %#x with senderState: %#x\n",
152                   pkt, pkt->senderState);
153        result = sendTiming(pkt);
154        if (result) {
155            DPRINTF(DMA, "-- Done\n");
156            transmitList.pop_front();
157            pendingCount--;
158            assert(pendingCount >= 0);
159        } else {
160            DPRINTF(DMA, "-- Failed, queued\n");
161        }
162    }
163}
164
165
166void
167DmaPort::dmaAction(Packet::Command cmd, Addr addr, int size, Event *event,
168                   uint8_t *data)
169{
170    assert(event);
171
172    int prevSize = 0;
173
174    for (ChunkGenerator gen(addr, size, peerBlockSize());
175         !gen.done(); gen.next()) {
176            Request *req = new Request(gen.addr(), gen.size(), 0);
177            Packet *pkt = new Packet(req, cmd, Packet::Broadcast);
178
179            // Increment the data pointer on a write
180            if (data)
181                pkt->dataStatic(data + prevSize);
182
183            prevSize += gen.size();
184
185            // Set the last bit of the dma as the final packet for this dma
186            // and set it's completion event.
187            if (prevSize == size) {
188                pkt->senderState = new DmaReqState(event, true);
189            }
190            assert(pendingCount >= 0);
191            pendingCount++;
192            sendDma(pkt);
193    }
194}
195
196
197void
198DmaPort::sendDma(Packet *pkt)
199{
200   // some kind of selction between access methods
201   // more work is going to have to be done to make
202   // switching actually work
203  /* MemState state = device->platform->system->memState;
204
205   if (state == Timing) {  */
206       DPRINTF(DMA, "Attempting to send Packet %#x with senderState: %#x\n",
207               pkt, pkt->senderState);
208       if (transmitList.size() || !sendTiming(pkt)) {
209           transmitList.push_back(pkt);
210           DPRINTF(DMA, "-- Failed: queued\n");
211       } else {
212           DPRINTF(DMA, "-- Done\n");
213           pendingCount--;
214           assert(pendingCount >= 0);
215       }
216  /*  } else if (state == Atomic) {
217       sendAtomic(pkt);
218       if (pkt->senderState) {
219           DmaReqState *state = dynamic_cast<DmaReqState*>(pkt->senderState);
220           assert(state);
221           state->completionEvent->schedule(curTick + (pkt->time - pkt->req->getTime()) +1);
222       }
223       pendingCount--;
224       assert(pendingCount >= 0);
225       delete pkt->req;
226       delete pkt;
227
228   } else if (state == Functional) {
229       sendFunctional(pkt);
230       // Is this correct???
231       completionEvent->schedule(pkt->req->responseTime - pkt->req->requestTime);
232       completionEvent == NULL;
233   } else
234       panic("Unknown memory command state.");
235  */
236}
237
238DmaDevice::~DmaDevice()
239{
240    if (dmaPort)
241        delete dmaPort;
242}
243
244
245