io_device.cc revision 2914:2c524dc023d2 
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#include "sim/system.hh"
36
37
38PioPort::PioPort(PioDevice *dev, System *s, std::string pname)
39    : SimpleTimingPort(dev->name() + pname), device(dev), sys(s)
40{ }
41
42
43Tick
44PioPort::recvAtomic(Packet *pkt)
45{
46    return device->recvAtomic(pkt);
47}
48
49void
50PioPort::recvFunctional(Packet *pkt)
51{
52    device->recvAtomic(pkt);
53}
54
55void
56PioPort::getDeviceAddressRanges(AddrRangeList &resp, AddrRangeList &snoop)
57{
58    snoop.clear();
59    device->addressRanges(resp);
60}
61
62
63bool
64PioPort::recvTiming(Packet *pkt)
65{
66    if (pkt->result == Packet::Nacked) {
67        resendNacked(pkt);
68    } else {
69        Tick latency = device->recvAtomic(pkt);
70        // turn packet around to go back to requester
71        pkt->makeTimingResponse();
72        sendTiming(pkt, latency);
73    }
74    return true;
75}
76
77PioDevice::~PioDevice()
78{
79    if (pioPort)
80        delete pioPort;
81}
82
83void
84PioDevice::init()
85{
86    if (!pioPort)
87        panic("Pio port not connected to anything!");
88    pioPort->sendStatusChange(Port::RangeChange);
89}
90
91
92unsigned int
93PioDevice::drain(Event *de)
94{
95    unsigned int count;
96    count = pioPort->drain(de);
97    if (count)
98        changeState(Draining);
99    else
100        changeState(Drained);
101    return count;
102}
103
104void
105BasicPioDevice::addressRanges(AddrRangeList &range_list)
106{
107    assert(pioSize != 0);
108    range_list.clear();
109    range_list.push_back(RangeSize(pioAddr, pioSize));
110}
111
112
113DmaPort::DmaPort(DmaDevice *dev, System *s)
114    : Port(dev->name() + "-dmaport"), device(dev), sys(s), pendingCount(0),
115      actionInProgress(0), drainEvent(NULL)
116{ }
117
118bool
119DmaPort::recvTiming(Packet *pkt)
120{
121
122
123    if (pkt->result == Packet::Nacked) {
124        DPRINTF(DMA, "Received nacked Pkt %#x with State: %#x Addr: %#x\n",
125               pkt, pkt->senderState, pkt->getAddr());
126        pkt->reinitNacked();
127        sendDma(pkt, true);
128    } else if (pkt->senderState) {
129        DmaReqState *state;
130        DPRINTF(DMA, "Received response Pkt %#x with State: %#x Addr: %#x\n",
131               pkt, pkt->senderState, pkt->getAddr());
132        state = dynamic_cast<DmaReqState*>(pkt->senderState);
133        pendingCount--;
134
135        assert(pendingCount >= 0);
136        assert(state);
137
138        state->numBytes += pkt->req->getSize();
139        if (state->totBytes == state->numBytes) {
140            state->completionEvent->process();
141            delete state;
142        }
143        delete pkt->req;
144        delete pkt;
145
146        if (pendingCount == 0 && drainEvent) {
147            drainEvent->process();
148            drainEvent = NULL;
149        }
150    }  else {
151        panic("Got packet without sender state... huh?\n");
152    }
153
154    return true;
155}
156
157DmaDevice::DmaDevice(Params *p)
158    : PioDevice(p), dmaPort(NULL)
159{ }
160
161
162unsigned int
163DmaDevice::drain(Event *de)
164{
165    unsigned int count;
166    count = pioPort->drain(de) + dmaPort->drain(de);
167    if (count)
168        changeState(Draining);
169    else
170        changeState(Drained);
171    return count;
172}
173
174unsigned int
175DmaPort::drain(Event *de)
176{
177    if (pendingCount == 0)
178        return 0;
179    drainEvent = de;
180    return 1;
181}
182
183
184void
185DmaPort::recvRetry()
186{
187    Packet* pkt = transmitList.front();
188    bool result = true;
189    while (result && transmitList.size()) {
190        DPRINTF(DMA, "Retry on  Packet %#x with senderState: %#x\n",
191                   pkt, pkt->senderState);
192        result = sendTiming(pkt);
193        if (result) {
194            DPRINTF(DMA, "-- Done\n");
195            transmitList.pop_front();
196        } else {
197            DPRINTF(DMA, "-- Failed, queued\n");
198        }
199    }
200}
201
202
203void
204DmaPort::dmaAction(Packet::Command cmd, Addr addr, int size, Event *event,
205                   uint8_t *data)
206{
207    assert(event);
208
209    assert(device->getState() == SimObject::Running);
210
211    DmaReqState *reqState = new DmaReqState(event, this, size);
212
213    for (ChunkGenerator gen(addr, size, peerBlockSize());
214         !gen.done(); gen.next()) {
215            Request *req = new Request(gen.addr(), gen.size(), 0);
216            Packet *pkt = new Packet(req, cmd, Packet::Broadcast);
217
218            // Increment the data pointer on a write
219            if (data)
220                pkt->dataStatic(data + gen.complete());
221
222            pkt->senderState = reqState;
223
224            assert(pendingCount >= 0);
225            pendingCount++;
226            sendDma(pkt);
227    }
228
229}
230
231
232void
233DmaPort::sendDma(Packet *pkt, bool front)
234{
235    // some kind of selction between access methods
236    // more work is going to have to be done to make
237    // switching actually work
238
239    System::MemoryMode state = sys->getMemoryMode();
240    if (state == System::Timing) {
241        DPRINTF(DMA, "Attempting to send Packet %#x with addr: %#x\n",
242                pkt, pkt->getAddr());
243        if (transmitList.size() || !sendTiming(pkt)) {
244            if (front)
245                transmitList.push_front(pkt);
246            else
247                transmitList.push_back(pkt);
248            DPRINTF(DMA, "-- Failed: queued\n");
249        } else {
250            DPRINTF(DMA, "-- Done\n");
251        }
252    } else if (state == System::Atomic) {
253        Tick lat;
254        lat = sendAtomic(pkt);
255        assert(pkt->senderState);
256        DmaReqState *state = dynamic_cast<DmaReqState*>(pkt->senderState);
257        assert(state);
258
259        state->numBytes += pkt->req->getSize();
260        if (state->totBytes == state->numBytes) {
261            state->completionEvent->schedule(curTick + lat);
262            delete state;
263            delete pkt->req;
264        }
265        pendingCount--;
266        assert(pendingCount >= 0);
267        delete pkt;
268
269        if (pendingCount == 0 && drainEvent) {
270            drainEvent->process();
271            drainEvent = NULL;
272        }
273
274   } else
275       panic("Unknown memory command state.");
276}
277
278DmaDevice::~DmaDevice()
279{
280    if (dmaPort)
281        delete dmaPort;
282}
283
284
285