io_device.cc revision 2784 
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    bool result = true;
66    while (result && transmitList.size()) {
67        result = Port::sendTiming(transmitList.front());
68        if (result)
69            transmitList.pop_front();
70    }
71}
72
73void
74PioPort::SendEvent::process()
75{
76    if (port->Port::sendTiming(packet))
77        return;
78
79    port->transmitList.push_back(packet);
80}
81
82
83
84bool
85PioPort::recvTiming(Packet *pkt)
86{
87    if (pkt->result == Packet::Nacked) {
88        pkt->reinitNacked();
89        if (transmitList.size()) {
90             transmitList.push_front(pkt);
91        } else {
92            if (!Port::sendTiming(pkt))
93                transmitList.push_front(pkt);
94        }
95    } else {
96        Tick latency = device->recvAtomic(pkt);
97        // turn packet around to go back to requester
98        pkt->makeTimingResponse();
99        sendTiming(pkt, latency);
100    }
101    return true;
102}
103
104PioDevice::~PioDevice()
105{
106    if (pioPort)
107        delete pioPort;
108}
109
110void
111PioDevice::init()
112{
113    if (!pioPort)
114        panic("Pio port not connected to anything!");
115    pioPort->sendStatusChange(Port::RangeChange);
116}
117
118void
119BasicPioDevice::addressRanges(AddrRangeList &range_list)
120{
121    assert(pioSize != 0);
122    range_list.clear();
123    range_list.push_back(RangeSize(pioAddr, pioSize));
124}
125
126
127DmaPort::DmaPort(DmaDevice *dev, Platform *p)
128    : Port(dev->name() + "-dmaport"), device(dev), platform(p), pendingCount(0)
129{ }
130
131bool
132DmaPort::recvTiming(Packet *pkt)
133{
134
135
136    if (pkt->result == Packet::Nacked) {
137        DPRINTF(DMA, "Received nacked Pkt %#x with State: %#x Addr: %#x\n",
138               pkt, pkt->senderState, pkt->getAddr());
139        pkt->reinitNacked();
140        sendDma(pkt, true);
141    } else if (pkt->senderState) {
142        DmaReqState *state;
143        DPRINTF(DMA, "Received response Pkt %#x with State: %#x Addr: %#x\n",
144               pkt, pkt->senderState, pkt->getAddr());
145        state = dynamic_cast<DmaReqState*>(pkt->senderState);
146        pendingCount--;
147
148        assert(pendingCount >= 0);
149        assert(state);
150
151        state->numBytes += pkt->req->getSize();
152        if (state->totBytes == state->numBytes) {
153            state->completionEvent->process();
154            delete state;
155        }
156        delete pkt->req;
157        delete pkt;
158    }  else {
159        panic("Got packet without sender state... huh?\n");
160    }
161
162    return true;
163}
164
165DmaDevice::DmaDevice(Params *p)
166    : PioDevice(p), dmaPort(NULL)
167{ }
168
169void
170DmaPort::recvRetry()
171{
172    Packet* pkt = transmitList.front();
173    bool result = true;
174    while (result && transmitList.size()) {
175        DPRINTF(DMA, "Retry on  Packet %#x with senderState: %#x\n",
176                   pkt, pkt->senderState);
177        result = sendTiming(pkt);
178        if (result) {
179            DPRINTF(DMA, "-- Done\n");
180            transmitList.pop_front();
181        } else {
182            DPRINTF(DMA, "-- Failed, queued\n");
183        }
184    }
185}
186
187
188void
189DmaPort::dmaAction(Packet::Command cmd, Addr addr, int size, Event *event,
190                   uint8_t *data)
191{
192    assert(event);
193
194    DmaReqState *reqState = new DmaReqState(event, this, size);
195
196    for (ChunkGenerator gen(addr, size, peerBlockSize());
197         !gen.done(); gen.next()) {
198            Request *req = new Request(gen.addr(), gen.size(), 0);
199            Packet *pkt = new Packet(req, cmd, Packet::Broadcast);
200
201            // Increment the data pointer on a write
202            if (data)
203                pkt->dataStatic(data + gen.complete());
204
205            pkt->senderState = reqState;
206
207            assert(pendingCount >= 0);
208            pendingCount++;
209            sendDma(pkt);
210    }
211}
212
213
214void
215DmaPort::sendDma(Packet *pkt, bool front)
216{
217   // some kind of selction between access methods
218   // more work is going to have to be done to make
219   // switching actually work
220  /* MemState state = device->platform->system->memState;
221
222   if (state == Timing) {  */
223       DPRINTF(DMA, "Attempting to send Packet %#x with addr: %#x\n",
224               pkt, pkt->getAddr());
225       if (transmitList.size() || !sendTiming(pkt)) {
226           if (front)
227               transmitList.push_front(pkt);
228           else
229               transmitList.push_back(pkt);
230           DPRINTF(DMA, "-- Failed: queued\n");
231       } else {
232           DPRINTF(DMA, "-- Done\n");
233       }
234  /*  } else if (state == Atomic) {
235       sendAtomic(pkt);
236       if (pkt->senderState) {
237           DmaReqState *state = dynamic_cast<DmaReqState*>(pkt->senderState);
238           assert(state);
239           state->completionEvent->schedule(curTick + (pkt->time -
240           pkt->req->getTime()) +1);
241           delete state;
242       }
243       pendingCount--;
244       assert(pendingCount >= 0);
245       delete pkt->req;
246       delete pkt;
247
248   } else if (state == Functional) {
249       sendFunctional(pkt);
250       // Is this correct???
251       completionEvent->schedule(pkt->req->responseTime - pkt->req->requestTime);
252       completionEvent == NULL;
253   } else
254       panic("Unknown memory command state.");
255  */
256}
257
258DmaDevice::~DmaDevice()
259{
260    if (dmaPort)
261        delete dmaPort;
262}
263
264
265