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;

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94BasicPioDevice::addressRanges(AddrRangeList &range_list)
95{
96 assert(pioSize != 0);
97 range_list.clear();
98 range_list.push_back(RangeSize(pioAddr, pioSize));
99}
100
101
102DmaPort::DmaPort(DmaDevice *dev, System *s)
103 : Port(dev->name() + "-dmaport", dev), device(dev), sys(s),
104 pendingCount(0), actionInProgress(0), drainEvent(NULL),
105 backoffTime(0), inRetry(false), backoffEvent(this)
106{ }
107
108bool
109DmaPort::recvTiming(PacketPtr pkt)
110{
111 if (pkt->wasNacked()) {
112 DPRINTF(DMA, "Received nacked %s addr %#x\n",
113 pkt->cmdString(), pkt->getAddr());
114
115 if (backoffTime < device->minBackoffDelay)
116 backoffTime = device->minBackoffDelay;
117 else if (backoffTime < device->maxBackoffDelay)
118 backoffTime <<= 1;
119
120 reschedule(backoffEvent, curTick + backoffTime, true);
121
122 DPRINTF(DMA, "Backoff time set to %d ticks\n", backoffTime);
123
124 pkt->reinitNacked();
125 queueDma(pkt, true);

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133 pendingCount--;
134
135 assert(pendingCount >= 0);
136 assert(state);
137
138 state->numBytes += pkt->req->getSize();
139 assert(state->totBytes >= state->numBytes);
140 if (state->totBytes == state->numBytes) {
141 if (state->delay)
142 schedule(state->completionEvent, curTick + state->delay);
143 else
144 state->completionEvent->process();
145 delete state;
146 }
147 delete pkt->req;
148 delete pkt;
149
150 if (pendingCount == 0 && drainEvent) {
151 drainEvent->process();
152 drainEvent = NULL;
153 }
154 } else {
155 panic("Got packet without sender state... huh?\n");
156 }
157
158 return true;
159}
160
161DmaDevice::DmaDevice(const Params *p)
162 : PioDevice(p), dmaPort(NULL), minBackoffDelay(p->min_backoff_delay),
163 maxBackoffDelay(p->max_backoff_delay)
164{ }
165
166
167unsigned int
168DmaDevice::drain(Event *de)
169{
170 unsigned int count;
171 count = pioPort->drain(de) + dmaPort->drain(de);

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216 backoffEvent.scheduled());
217}
218
219
220void
221DmaPort::dmaAction(Packet::Command cmd, Addr addr, int size, Event *event,
222 uint8_t *data, Tick delay)
223{
224 assert(event);
225
226 assert(device->getState() == SimObject::Running);
227
228 DmaReqState *reqState = new DmaReqState(event, this, size, delay);
229
230
231 DPRINTF(DMA, "Starting DMA for addr: %#x size: %d sched: %d\n", addr, size,
232 event->scheduled());
233 for (ChunkGenerator gen(addr, size, peerBlockSize());

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308 lat = sendAtomic(pkt);
309 assert(pkt->senderState);
310 DmaReqState *state = dynamic_cast<DmaReqState*>(pkt->senderState);
311 assert(state);
312 state->numBytes += pkt->req->getSize();
313
314 DPRINTF(DMA, "--Received response for DMA for addr: %#x size: %d nb: %d, tot: %d sched %d\n",
315 pkt->req->getPaddr(), pkt->req->getSize(), state->numBytes,
316 state->totBytes, state->completionEvent->scheduled());
317
318 if (state->totBytes == state->numBytes) {
319 assert(!state->completionEvent->scheduled());
320 schedule(state->completionEvent, curTick + lat + state->delay);
321 delete state;
322 delete pkt->req;
323 }
324 pendingCount--;
325 assert(pendingCount >= 0);
326 delete pkt;
327
328 if (pendingCount == 0 && drainEvent) {

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