1
2/*
3 * Copyright (c) 2006 The Regents of The University of Michigan
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions are
8 * met: redistributions of source code must retain the above copyright

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85/** Function called by the port when the bus is receiving a Timing
86 * transaction.*/
87bool
88Bridge::BridgePort::recvTiming(Packet *pkt)
89{
90 DPRINTF(BusBridge, "recvTiming: src %d dest %d addr 0x%x\n",
91 pkt->getSrc(), pkt->getDest(), pkt->getAddr());
92
93 if (pkt->isResponse()) {
94 // This is a response for a request we forwarded earlier. The
95 // corresponding PacketBuffer should be stored in the packet's
96 // senderState field.
97 PacketBuffer *buf = dynamic_cast<PacketBuffer*>(pkt->senderState);
98 assert(buf != NULL);
99 // set up new packet dest & senderState based on values saved
100 // from original request
101 buf->fixResponse(pkt);
102 DPRINTF(BusBridge, " is response, new dest %d\n", pkt->getDest());
103 delete buf;
104 }
105
106 return otherPort->queueForSendTiming(pkt);
107}
108
109
110bool
111Bridge::BridgePort::queueForSendTiming(Packet *pkt)
112{
113 if (queueFull())
114 return false;
115
116 Tick readyTime = curTick + delay;
117 PacketBuffer *buf = new PacketBuffer(pkt, readyTime);
118
119 // If we're about to put this packet at the head of the queue, we
120 // need to schedule an event to do the transmit. Otherwise there
121 // should already be an event scheduled for sending the head
122 // packet.
123 if (sendQueue.empty()) {
124 sendEvent.schedule(readyTime);
125 }
126
127 sendQueue.push_back(buf);
128
129 // Did we just become blocked? If yes, let other side know.
130 if (queueFull())
131 otherPort->sendStatusChange(Port::Blocked);
132
133 return true;
134}
135
136
137void
138Bridge::BridgePort::finishSend(PacketBuffer *buf)
139{
140 if (buf->expectResponse) {
141 // Must wait for response. We just need to count outstanding
142 // responses (in case we want to cap them); PacketBuffer
143 // pointer will be recovered on response.
144 ++outstandingResponses;
145 DPRINTF(BusBridge, " successful: awaiting response (%d)\n",
146 outstandingResponses);
147 } else {
148 // no response expected... deallocate packet buffer now.
149 DPRINTF(BusBridge, " successful: no response expected\n");
150 delete buf;
151 }
152
153 // If there are more packets to send, schedule event to try again.
154 if (!sendQueue.empty()) {
155 buf = sendQueue.front();
156 sendEvent.schedule(std::max(buf->ready, curTick + 1));
157 }
158}
159
160
161void
162Bridge::BridgePort::trySend()
163{
164 assert(!sendQueue.empty());
165
166 PacketBuffer *buf = sendQueue.front();
167
168 assert(buf->ready <= curTick);
169
170 Packet *pkt = buf->pkt;
171
172 DPRINTF(BusBridge, "trySend: origSrc %d dest %d addr 0x%x\n",
173 buf->origSrc, pkt->getDest(), pkt->getAddr());
174
175 if (sendTiming(pkt)) {
176 // send successful
177 sendQueue.pop_front();
178 buf->pkt = NULL; // we no longer own packet, so it's not safe to look at it
179 finishSend(buf);
180 } else {
181 DPRINTF(BusBridge, " unsuccessful\n");
182 }
183}
184
185
186Packet *
187Bridge::BridgePort::recvRetry()
188{
189 PacketBuffer *buf = sendQueue.front();
190 Packet *pkt = buf->pkt;
191 finishSend(buf);
192 return pkt;
193}
194
195/** Function called by the port when the bus is receiving a Atomic
196 * transaction.*/
197Tick
198Bridge::BridgePort::recvAtomic(Packet *pkt)
199{
200 return otherPort->sendAtomic(pkt) + delay;

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218 otherPort->sendFunctional(pkt);
219 }
220}
221
222/** Function called by the port when the bus is receiving a status change.*/
223void
224Bridge::BridgePort::recvStatusChange(Port::Status status)
225{
226 if (status == Port::Blocked || status == Port::Unblocked)
227 return;
228
229 otherPort->sendStatusChange(status);
230}
231
232void
233Bridge::BridgePort::getDeviceAddressRanges(AddrRangeList &resp,
234 AddrRangeList &snoop)
235{
236 otherPort->getPeerAddressRanges(resp, snoop);

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