io_device.cc (3401:1df0cb879413) io_device.cc (4435:7da241055348)
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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88 assert(pioSize != 0);
89 range_list.clear();
90 range_list.push_back(RangeSize(pioAddr, pioSize));
91}
92
93
94DmaPort::DmaPort(DmaDevice *dev, System *s)
95 : Port(dev->name() + "-dmaport", dev), device(dev), sys(s),
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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88 assert(pioSize != 0);
89 range_list.clear();
90 range_list.push_back(RangeSize(pioAddr, pioSize));
91}
92
93
94DmaPort::DmaPort(DmaDevice *dev, System *s)
95 : Port(dev->name() + "-dmaport", dev), device(dev), sys(s),
96 pendingCount(0), actionInProgress(0), drainEvent(NULL)
96 pendingCount(0), actionInProgress(0), drainEvent(NULL),
97 backoffTime(0), inRetry(false), backoffEvent(this)
97{ }
98
99bool
100DmaPort::recvTiming(PacketPtr pkt)
101{
102
103
104 if (pkt->result == Packet::Nacked) {
105 DPRINTF(DMA, "Received nacked Pkt %#x with State: %#x Addr: %#x\n",
106 pkt, pkt->senderState, pkt->getAddr());
98{ }
99
100bool
101DmaPort::recvTiming(PacketPtr pkt)
102{
103
104
105 if (pkt->result == Packet::Nacked) {
106 DPRINTF(DMA, "Received nacked Pkt %#x with State: %#x Addr: %#x\n",
107 pkt, pkt->senderState, pkt->getAddr());
108
109 if (backoffTime < device->minBackoffDelay)
110 backoffTime = device->minBackoffDelay;
111 else if (backoffTime < device->maxBackoffDelay)
112 backoffTime <<= 1;
113
114 if (backoffEvent.scheduled())
115 backoffEvent.reschedule(curTick + backoffTime);
116 else
117 backoffEvent.schedule(curTick + backoffTime);
118
119 DPRINTF(DMA, "Backoff time set to %d ticks\n", backoffTime);
120
107 pkt->reinitNacked();
121 pkt->reinitNacked();
108 sendDma(pkt, true);
122 queueDma(pkt, true);
109 } else if (pkt->senderState) {
110 DmaReqState *state;
123 } else if (pkt->senderState) {
124 DmaReqState *state;
111 DPRINTF(DMA, "Received response Pkt %#x with State: %#x Addr: %#x\n",
112 pkt, pkt->senderState, pkt->getAddr());
125 backoffTime >>= 2;
126
127 DPRINTF(DMA, "Received response Pkt %#x with State: %#x Addr: %#x size: %#x\n",
128 pkt, pkt->senderState, pkt->getAddr(), pkt->req->getSize());
113 state = dynamic_cast<DmaReqState*>(pkt->senderState);
114 pendingCount--;
115
116 assert(pendingCount >= 0);
117 assert(state);
118
119 state->numBytes += pkt->req->getSize();
129 state = dynamic_cast<DmaReqState*>(pkt->senderState);
130 pendingCount--;
131
132 assert(pendingCount >= 0);
133 assert(state);
134
135 state->numBytes += pkt->req->getSize();
136 assert(state->totBytes >= state->numBytes);
120 if (state->totBytes == state->numBytes) {
121 state->completionEvent->process();
122 delete state;
123 }
124 delete pkt->req;
125 delete pkt;
126
127 if (pendingCount == 0 && drainEvent) {
128 drainEvent->process();
129 drainEvent = NULL;
130 }
131 } else {
132 panic("Got packet without sender state... huh?\n");
133 }
134
135 return true;
136}
137
138DmaDevice::DmaDevice(Params *p)
137 if (state->totBytes == state->numBytes) {
138 state->completionEvent->process();
139 delete state;
140 }
141 delete pkt->req;
142 delete pkt;
143
144 if (pendingCount == 0 && drainEvent) {
145 drainEvent->process();
146 drainEvent = NULL;
147 }
148 } else {
149 panic("Got packet without sender state... huh?\n");
150 }
151
152 return true;
153}
154
155DmaDevice::DmaDevice(Params *p)
139 : PioDevice(p), dmaPort(NULL)
156 : PioDevice(p), dmaPort(NULL), minBackoffDelay(p->min_backoff_delay),
157 maxBackoffDelay(p->max_backoff_delay)
140{ }
141
142
143unsigned int
144DmaDevice::drain(Event *de)
145{
146 unsigned int count;
147 count = pioPort->drain(de) + dmaPort->drain(de);

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160 drainEvent = de;
161 return 1;
162}
163
164
165void
166DmaPort::recvRetry()
167{
158{ }
159
160
161unsigned int
162DmaDevice::drain(Event *de)
163{
164 unsigned int count;
165 count = pioPort->drain(de) + dmaPort->drain(de);

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178 drainEvent = de;
179 return 1;
180}
181
182
183void
184DmaPort::recvRetry()
185{
186 assert(transmitList.size());
168 PacketPtr pkt = transmitList.front();
169 bool result = true;
187 PacketPtr pkt = transmitList.front();
188 bool result = true;
170 while (result && transmitList.size()) {
189 do {
171 DPRINTF(DMA, "Retry on Packet %#x with senderState: %#x\n",
172 pkt, pkt->senderState);
173 result = sendTiming(pkt);
174 if (result) {
175 DPRINTF(DMA, "-- Done\n");
176 transmitList.pop_front();
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 inRetry = false;
177 } else {
197 } else {
198 inRetry = true;
178 DPRINTF(DMA, "-- Failed, queued\n");
179 }
199 DPRINTF(DMA, "-- Failed, queued\n");
200 }
201 } while (!backoffTime && result && transmitList.size());
202
203 if (transmitList.size() && backoffTime && !inRetry) {
204 DPRINTF(DMA, "Scheduling backoff for %d\n", curTick+backoffTime);
205 if (!backoffEvent.scheduled())
206 backoffEvent.schedule(backoffTime+curTick);
180 }
207 }
208 DPRINTF(DMA, "TransmitList: %d, backoffTime: %d inRetry: %d es: %d\n",
209 transmitList.size(), backoffTime, inRetry,
210 backoffEvent.scheduled());
181}
182
183
184void
185DmaPort::dmaAction(Packet::Command cmd, Addr addr, int size, Event *event,
186 uint8_t *data)
187{
188 assert(event);

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199 // Increment the data pointer on a write
200 if (data)
201 pkt->dataStatic(data + gen.complete());
202
203 pkt->senderState = reqState;
204
205 assert(pendingCount >= 0);
206 pendingCount++;
211}
212
213
214void
215DmaPort::dmaAction(Packet::Command cmd, Addr addr, int size, Event *event,
216 uint8_t *data)
217{
218 assert(event);

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229 // Increment the data pointer on a write
230 if (data)
231 pkt->dataStatic(data + gen.complete());
232
233 pkt->senderState = reqState;
234
235 assert(pendingCount >= 0);
236 pendingCount++;
207 sendDma(pkt);
237 queueDma(pkt);
208 }
209
210}
211
238 }
239
240}
241
242void
243DmaPort::queueDma(PacketPtr pkt, bool front)
244{
212
245
246 if (front)
247 transmitList.push_front(pkt);
248 else
249 transmitList.push_back(pkt);
250 sendDma();
251}
252
253
213void
254void
214DmaPort::sendDma(PacketPtr pkt, bool front)
255DmaPort::sendDma()
215{
216 // some kind of selction between access methods
217 // more work is going to have to be done to make
218 // switching actually work
256{
257 // some kind of selction between access methods
258 // more work is going to have to be done to make
259 // switching actually work
260 assert(transmitList.size());
261 PacketPtr pkt = transmitList.front();
219
220 System::MemoryMode state = sys->getMemoryMode();
221 if (state == System::Timing) {
262
263 System::MemoryMode state = sys->getMemoryMode();
264 if (state == System::Timing) {
265 if (backoffEvent.scheduled() || inRetry) {
266 DPRINTF(DMA, "Can't send immediately, waiting for retry or backoff timer\n");
267 return;
268 }
269
222 DPRINTF(DMA, "Attempting to send Packet %#x with addr: %#x\n",
223 pkt, pkt->getAddr());
270 DPRINTF(DMA, "Attempting to send Packet %#x with addr: %#x\n",
271 pkt, pkt->getAddr());
224 if (transmitList.size() || !sendTiming(pkt)) {
225 if (front)
226 transmitList.push_front(pkt);
227 else
228 transmitList.push_back(pkt);
229 DPRINTF(DMA, "-- Failed: queued\n");
230 } else {
231 DPRINTF(DMA, "-- Done\n");
272
273 bool result;
274 do {
275 result = sendTiming(pkt);
276 if (result) {
277 transmitList.pop_front();
278 DPRINTF(DMA, "-- Done\n");
279 } else {
280 inRetry = true;
281 DPRINTF(DMA, "-- Failed: queued\n");
282 }
283 } while (result && !backoffTime && transmitList.size());
284
285 if (transmitList.size() && backoffTime && !inRetry &&
286 !backoffEvent.scheduled()) {
287 backoffEvent.schedule(backoffTime+curTick);
232 }
233 } else if (state == System::Atomic) {
288 }
289 } else if (state == System::Atomic) {
290 transmitList.pop_front();
291
234 Tick lat;
235 lat = sendAtomic(pkt);
236 assert(pkt->senderState);
237 DmaReqState *state = dynamic_cast<DmaReqState*>(pkt->senderState);
238 assert(state);
239
240 state->numBytes += pkt->req->getSize();
241 if (state->totBytes == state->numBytes) {

--- 24 unchanged lines hidden --- 		292 Tick lat;
293 lat = sendAtomic(pkt);
294 assert(pkt->senderState);
295 DmaReqState *state = dynamic_cast<DmaReqState*>(pkt->senderState);
296 assert(state);
297
298 state->numBytes += pkt->req->getSize();
299 if (state->totBytes == state->numBytes) {

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