io_device.cc (4870:fcc39d001154) io_device.cc (4885:385a051ad874)
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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96 pendingCount(0), actionInProgress(0), drainEvent(NULL),
97 backoffTime(0), inRetry(false), backoffEvent(this)
98{ }
99
100bool
101DmaPort::recvTiming(PacketPtr pkt)
102{
103 if (pkt->wasNacked()) {
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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96 pendingCount(0), actionInProgress(0), drainEvent(NULL),
97 backoffTime(0), inRetry(false), backoffEvent(this)
98{ }
99
100bool
101DmaPort::recvTiming(PacketPtr pkt)
102{
103 if (pkt->wasNacked()) {
104 DPRINTF(DMA, "Received nacked Pkt %#x with State: %#x Addr: %#x\n",
105 pkt, pkt->senderState, pkt->getAddr());
104 DPRINTF(DMA, "Received nacked %s addr %#x\n",
105 pkt->cmdString(), pkt->getAddr());
106
107 if (backoffTime < device->minBackoffDelay)
108 backoffTime = device->minBackoffDelay;
109 else if (backoffTime < device->maxBackoffDelay)
110 backoffTime <<= 1;
111
112 backoffEvent.reschedule(curTick + backoffTime, true);
113
114 DPRINTF(DMA, "Backoff time set to %d ticks\n", backoffTime);
115
116 pkt->reinitNacked();
117 queueDma(pkt, true);
118 } else if (pkt->senderState) {
119 DmaReqState *state;
120 backoffTime >>= 2;
121
106
107 if (backoffTime < device->minBackoffDelay)
108 backoffTime = device->minBackoffDelay;
109 else if (backoffTime < device->maxBackoffDelay)
110 backoffTime <<= 1;
111
112 backoffEvent.reschedule(curTick + backoffTime, true);
113
114 DPRINTF(DMA, "Backoff time set to %d ticks\n", backoffTime);
115
116 pkt->reinitNacked();
117 queueDma(pkt, true);
118 } else if (pkt->senderState) {
119 DmaReqState *state;
120 backoffTime >>= 2;
121
122 DPRINTF(DMA, "Received response Pkt %#x with State: %#x Addr: %#x size: %#x\n",
123 pkt, pkt->senderState, pkt->getAddr(), pkt->req->getSize());
122 DPRINTF(DMA, "Received response %s addr %#x size %#x\n",
123 pkt->cmdString(), pkt->getAddr(), pkt->req->getSize());
124 state = dynamic_cast<DmaReqState*>(pkt->senderState);
125 pendingCount--;
126
127 assert(pendingCount >= 0);
128 assert(state);
129
130 state->numBytes += pkt->req->getSize();
131 assert(state->totBytes >= state->numBytes);

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177
178void
179DmaPort::recvRetry()
180{
181 assert(transmitList.size());
182 PacketPtr pkt = transmitList.front();
183 bool result = true;
184 do {
124 state = dynamic_cast<DmaReqState*>(pkt->senderState);
125 pendingCount--;
126
127 assert(pendingCount >= 0);
128 assert(state);
129
130 state->numBytes += pkt->req->getSize();
131 assert(state->totBytes >= state->numBytes);

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177
178void
179DmaPort::recvRetry()
180{
181 assert(transmitList.size());
182 PacketPtr pkt = transmitList.front();
183 bool result = true;
184 do {
185 DPRINTF(DMA, "Retry on Packet %#x with senderState: %#x\n",
186 pkt, pkt->senderState);
185 DPRINTF(DMA, "Retry on %s addr %#x\n",
186 pkt->cmdString(), pkt->getAddr());
187 result = sendTiming(pkt);
188 if (result) {
189 DPRINTF(DMA, "-- Done\n");
190 transmitList.pop_front();
191 inRetry = false;
192 } else {
193 inRetry = true;
194 DPRINTF(DMA, "-- Failed, queued\n");

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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
187 result = sendTiming(pkt);
188 if (result) {
189 DPRINTF(DMA, "-- Done\n");
190 transmitList.pop_front();
191 inRetry = false;
192 } else {
193 inRetry = true;
194 DPRINTF(DMA, "-- Failed, queued\n");

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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
270 DPRINTF(DMA, "Attempting to send Packet %#x with addr: %#x\n",
271 pkt, pkt->getAddr());
270 DPRINTF(DMA, "Attempting to send %s addr %#x\n",
271 pkt->cmdString(), pkt->getAddr());
272
273 bool result;
274 do {
275 result = sendTiming(pkt);
276 if (result) {
277 transmitList.pop_front();
278 DPRINTF(DMA, "-- Done\n");
279 } else {

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273 bool result;
274 do {
275 result = sendTiming(pkt);
276 if (result) {
277 transmitList.pop_front();
278 DPRINTF(DMA, "-- Done\n");
279 } else {

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