Reorganize bridge as pair of cooperating ports.
Store original source & senderState for timing packets that get a response, so we can properly route the response packet back to the original sender. --HG-- extra : convert_revision : 03dbcc8dc06d93de243bfcdc3cbaa012773c6782
This commit is contained in:
Steve Reinhardt
parent
cdad113afb
commit
acb05ebcf6
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@ -31,209 +31,209 @@
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* @file Definition of a simple bus bridge without buffering.
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*/
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#include <algorithm>
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#include "base/trace.hh"
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#include "mem/bridge.hh"
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#include "sim/builder.hh"
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Bridge::BridgePort::BridgePort(const std::string &_name,
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Bridge *_bridge, BridgePort *_otherPort,
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int _delay, int _queueLimit)
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: Port(_name), bridge(_bridge), otherPort(_otherPort),
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delay(_delay), outstandingResponses(0),
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queueLimit(_queueLimit), sendEvent(this)
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{
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}
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Bridge::Bridge(const std::string &n, int qsa, int qsb,
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Tick _delay, int write_ack)
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: MemObject(n),
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portA(n + "-portA", this, &portB, _delay, qsa),
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portB(n + "-portB", this, &portA, _delay, qsa),
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ackWrites(write_ack)
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{
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}
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Port *
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Bridge::getPort(const std::string &if_name)
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{
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BridgePort *port;
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if (if_name == "side_a")
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port = &portA;
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else if (if_name == "side_b")
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port = &portB;
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else
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return NULL;
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if (port->getPeer() != NULL)
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panic("bridge side %s already connected to.", if_name);
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return port;
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}
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void
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Bridge::init()
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{
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// Make sure that both sides are connected to.
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if (sideA == NULL || sideB == NULL)
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if (portA.getPeer() == NULL || portB.getPeer() == NULL)
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panic("Both ports of bus bridge are not connected to a bus.\n");
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}
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/** Function called by the port when the bus is recieving a Timing
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/** Function called by the port when the bus is receiving a Timing
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* transaction.*/
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bool
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Bridge::recvTiming(Packet *pkt, Side id)
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Bridge::BridgePort::recvTiming(Packet *pkt)
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{
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if (blockedA && id == SideA)
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return false;
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if (blockedB && id == SideB)
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DPRINTF(BusBridge, "recvTiming: src %d dest %d addr 0x%x\n",
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pkt->getSrc(), pkt->getDest(), pkt->getAddr());
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if (pkt->isResponse()) {
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// This is a response for a request we forwarded earlier. The
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// corresponding PacketBuffer should be stored in the packet's
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// senderState field.
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PacketBuffer *buf = dynamic_cast<PacketBuffer*>(pkt->senderState);
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assert(buf != NULL);
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// set up new packet dest & senderState based on values saved
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// from original request
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buf->fixResponse(pkt);
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DPRINTF(BusBridge, " is response, new dest %d\n", pkt->getDest());
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delete buf;
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}
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return otherPort->queueForSendTiming(pkt);
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}
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bool
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Bridge::BridgePort::queueForSendTiming(Packet *pkt)
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{
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if (queueFull())
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return false;
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if (delay) {
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if (!sendEvent.scheduled())
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sendEvent.schedule(curTick + delay);
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if (id == SideA) {
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inboundA.push_back(std::make_pair<Packet*, Tick>(pkt, curTick));
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blockCheck(SideA);
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} else {
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inboundB.push_back(std::make_pair<Packet*, Tick>(pkt, curTick));
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blockCheck(SideB);
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}
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} else {
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if (id == SideB) {
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sideA->sendPkt(pkt);
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blockCheck(SideB);
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} else {
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sideB->sendPkt(pkt);
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blockCheck(SideA);
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}
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Tick readyTime = curTick + delay;
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PacketBuffer *buf = new PacketBuffer(pkt, readyTime);
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// If we're about to put this packet at the head of the queue, we
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// need to schedule an event to do the transmit. Otherwise there
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// should already be an event scheduled for sending the head
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// packet.
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if (sendQueue.empty()) {
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sendEvent.schedule(readyTime);
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}
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sendQueue.push_back(buf);
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// Did we just become blocked? If yes, let other side know.
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if (queueFull())
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otherPort->sendStatusChange(Port::Blocked);
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return true;
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}
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void
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Bridge::blockCheck(Side id)
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Bridge::BridgePort::finishSend(PacketBuffer *buf)
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{
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/* Check that we still have buffer space available. */
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if (id == SideB) {
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if (sideA->numQueued() + inboundB.size() >= queueSizeA && !blockedB) {
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sideB->sendStatusChange(Port::Blocked);
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blockedB = true;
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} else if (sideA->numQueued() + inboundB.size() < queueSizeA && blockedB) {
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sideB->sendStatusChange(Port::Unblocked);
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blockedB = false;
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}
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if (buf->expectResponse) {
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// Must wait for response. We just need to count outstanding
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// responses (in case we want to cap them); PacketBuffer
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// pointer will be recovered on response.
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++outstandingResponses;
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DPRINTF(BusBridge, " successful: awaiting response (%d)\n",
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outstandingResponses);
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} else {
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if (sideB->numQueued() + inboundA.size() >= queueSizeB && !blockedA) {
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sideA->sendStatusChange(Port::Blocked);
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blockedA = true;
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} else if (sideB->numQueued() + inboundA.size() < queueSizeB && blockedA) {
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sideA->sendStatusChange(Port::Unblocked);
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blockedA = false;
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}
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// no response expected... deallocate packet buffer now.
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DPRINTF(BusBridge, " successful: no response expected\n");
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delete buf;
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}
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// If there are more packets to send, schedule event to try again.
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if (!sendQueue.empty()) {
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buf = sendQueue.front();
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sendEvent.schedule(std::max(buf->ready, curTick + 1));
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}
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}
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void Bridge::timerEvent()
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{
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Tick t = 0;
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assert(inboundA.size() || inboundB.size());
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if (inboundA.size()) {
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while (inboundA.front().second <= curTick + delay){
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sideB->sendPkt(inboundA.front());
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inboundA.pop_front();
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}
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if (inboundA.size())
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t = inboundA.front().second + delay;
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}
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if (inboundB.size()) {
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while (inboundB.front().second <= curTick + delay){
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sideB->sendPkt(inboundA.front());
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inboundB.pop_front();
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}
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if (inboundB.size())
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if (t == 0)
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t = inboundB.front().second + delay;
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else
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t = std::min(t,inboundB.front().second + delay);
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void
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Bridge::BridgePort::trySend()
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{
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assert(!sendQueue.empty());
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PacketBuffer *buf = sendQueue.front();
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assert(buf->ready <= curTick);
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Packet *pkt = buf->pkt;
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DPRINTF(BusBridge, "trySend: origSrc %d dest %d addr 0x%x\n",
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buf->origSrc, pkt->getDest(), pkt->getAddr());
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if (sendTiming(pkt)) {
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// send successful
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sendQueue.pop_front();
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buf->pkt = NULL; // we no longer own packet, so it's not safe to look at it
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finishSend(buf);
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} else {
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panic("timerEvent() called but nothing to do?");
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DPRINTF(BusBridge, " unsuccessful\n");
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}
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if (t != 0)
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sendEvent.schedule(t);
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}
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void
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Bridge::BridgePort::sendPkt(Packet *pkt)
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{
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if (!sendTiming(pkt))
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outbound.push_back(std::make_pair<Packet*,Tick>(pkt, curTick));
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}
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void
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Bridge::BridgePort::sendPkt(std::pair<Packet*, Tick> p)
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{
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if (!sendTiming(p.first))
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outbound.push_back(p);
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}
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Packet *
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Bridge::BridgePort::recvRetry()
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{
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Packet *pkt;
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assert(outbound.size() > 0);
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assert(outbound.front().second >= curTick + bridge->delay);
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pkt = outbound.front().first;
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outbound.pop_front();
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bridge->blockCheck(side);
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PacketBuffer *buf = sendQueue.front();
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Packet *pkt = buf->pkt;
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finishSend(buf);
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return pkt;
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}
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/** Function called by the port when the bus is recieving a Atomic
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/** Function called by the port when the bus is receiving a Atomic
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* transaction.*/
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Tick
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Bridge::recvAtomic(Packet *pkt, Side id)
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Bridge::BridgePort::recvAtomic(Packet *pkt)
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{
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pkt->time += delay;
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if (id == SideA)
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return sideB->sendAtomic(pkt);
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else
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return sideA->sendAtomic(pkt);
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return otherPort->sendAtomic(pkt) + delay;
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}
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/** Function called by the port when the bus is recieving a Functional
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/** Function called by the port when the bus is receiving a Functional
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* transaction.*/
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void
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Bridge::recvFunctional(Packet *pkt, Side id)
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Bridge::BridgePort::recvFunctional(Packet *pkt)
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{
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pkt->time += delay;
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std::list<std::pair<Packet*, Tick> >::iterator i;
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std::list<PacketBuffer*>::iterator i;
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bool pktContinue = true;
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for(i = inboundA.begin(); i != inboundA.end(); ++i) {
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if (pkt->intersect(i->first)) {
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pktContinue &= fixPacket(pkt, i->first);
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}
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}
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for(i = inboundB.begin(); i != inboundB.end(); ++i) {
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if (pkt->intersect(i->first)) {
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pktContinue &= fixPacket(pkt, i->first);
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}
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}
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for(i = sideA->outbound.begin(); i != sideA->outbound.end(); ++i) {
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if (pkt->intersect(i->first)) {
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pktContinue &= fixPacket(pkt, i->first);
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}
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}
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for(i = sideB->outbound.begin(); i != sideB->outbound.end(); ++i) {
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if (pkt->intersect(i->first)) {
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pktContinue &= fixPacket(pkt, i->first);
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for (i = sendQueue.begin(); i != sendQueue.end(); ++i) {
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if (pkt->intersect((*i)->pkt)) {
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pktContinue &= fixPacket(pkt, (*i)->pkt);
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}
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}
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if (pktContinue) {
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if (id == SideA)
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sideB->sendFunctional(pkt);
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else
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sideA->sendFunctional(pkt);
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otherPort->sendFunctional(pkt);
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}
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}
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/** Function called by the port when the bus is recieving a status change.*/
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/** Function called by the port when the bus is receiving a status change.*/
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void
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Bridge::recvStatusChange(Port::Status status, Side id)
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Bridge::BridgePort::recvStatusChange(Port::Status status)
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{
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if (status == Port::Blocked || status == Port::Unblocked)
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return ;
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return;
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if (id == SideA)
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sideB->sendStatusChange(status);
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else
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sideA->sendStatusChange(status);
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otherPort->sendStatusChange(status);
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}
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void
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Bridge::addressRanges(AddrRangeList &resp, AddrRangeList &snoop, Side id)
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Bridge::BridgePort::getDeviceAddressRanges(AddrRangeList &resp,
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AddrRangeList &snoop)
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{
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if (id == SideA)
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sideB->getPeerAddressRanges(resp, snoop);
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else
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sideA->getPeerAddressRanges(resp, snoop);
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otherPort->getPeerAddressRanges(resp, snoop);
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}
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BEGIN_DECLARE_SIM_OBJECT_PARAMS(Bridge)
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@ -46,132 +46,127 @@
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class Bridge : public MemObject
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{
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public:
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enum Side
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{
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SideA,
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SideB
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};
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protected:
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/** Function called by the port when the bus is recieving a Timing
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transaction.*/
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bool recvTiming(Packet *pkt, Side id);
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/** Function called by the port when the bus is recieving a Atomic
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transaction.*/
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Tick recvAtomic(Packet *pkt, Side id);
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/** Function called by the port when the bus is recieving a Functional
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transaction.*/
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void recvFunctional(Packet *pkt, Side id);
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/** Function called by the port when the bus is recieving a status change.*/
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void recvStatusChange(Port::Status status, Side id);
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/** Process address range request.
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* @param resp addresses that we can respond to
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* @param snoop addresses that we would like to snoop
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* @param id ide of the busport that made the request.
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*/
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void addressRanges(AddrRangeList &resp, AddrRangeList &snoop, Side id);
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/** Event that the SendEvent calls when it fires. This code must reschedule
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* the send event as required. */
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void timerEvent();
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/** Decleration of the buses port type, one will be instantiated for each
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of the interfaces connecting to the bus. */
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class BridgePort : public Port
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{
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/** A pointer to the bus to which this port belongs. */
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/** A pointer to the bridge to which this port belongs. */
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Bridge *bridge;
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/** A id to keep track of the intercafe ID this port is connected to. */
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Bridge::Side side;
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/**
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* Pointer to the port on the other side of the bridge
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* (connected to the other bus).
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*/
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BridgePort *otherPort;
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/** Minimum delay though this bridge. */
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Tick delay;
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class PacketBuffer : public Packet::SenderState {
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public:
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Tick ready;
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Packet *pkt;
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Packet::SenderState *origSenderState;
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short origSrc;
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bool expectResponse;
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PacketBuffer(Packet *_pkt, Tick t)
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: ready(t), pkt(_pkt),
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origSenderState(_pkt->senderState), origSrc(_pkt->getSrc()),
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expectResponse(_pkt->needsResponse())
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{
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pkt->senderState = this;
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}
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void fixResponse(Packet *pkt)
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{
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assert(pkt->senderState == this);
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pkt->setDest(origSrc);
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pkt->senderState = origSenderState;
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}
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};
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/**
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* Outbound packet queue. Packets are held in this queue for a
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* specified delay to model the processing delay of the
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* bridge.
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*/
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std::list<PacketBuffer*> sendQueue;
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int outstandingResponses;
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/** Max queue size for outbound packets */
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int queueLimit;
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/**
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* Is this side blocked from accepting outbound packets?
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*/
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bool queueFull() { return (sendQueue.size() == queueLimit); }
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bool queueForSendTiming(Packet *pkt);
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void finishSend(PacketBuffer *buf);
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/**
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* Handle send event, scheduled when the packet at the head of
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* the outbound queue is ready to transmit (for timing
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* accesses only).
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*/
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void trySend();
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class SendEvent : public Event
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{
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BridgePort *port;
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public:
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SendEvent(BridgePort *p)
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: Event(&mainEventQueue), port(p) {}
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virtual void process() { port->trySend(); }
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virtual const char *description() { return "bridge send event"; }
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};
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SendEvent sendEvent;
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public:
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/** Constructor for the BusPort.*/
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BridgePort(Bridge *_bridge, Side _side)
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: Port(""), bridge(_bridge), side(_side)
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{ }
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|
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int numQueued() { return outbound.size(); }
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BridgePort(const std::string &_name,
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Bridge *_bridge, BridgePort *_otherPort,
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int _delay, int _queueLimit);
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|
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protected:
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/** Data this is waiting to be transmitted. */
|
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std::list<std::pair<Packet*, Tick> > outbound;
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|
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void sendPkt(Packet *pkt);
|
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void sendPkt(std::pair<Packet*, Tick> p);
|
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|
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/** When reciving a timing request from the peer port,
|
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/** When receiving a timing request from the peer port,
|
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pass it to the bridge. */
|
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virtual bool recvTiming(Packet *pkt)
|
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{ return bridge->recvTiming(pkt, side); }
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virtual bool recvTiming(Packet *pkt);
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/** When reciving a retry request from the peer port,
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/** When receiving a retry request from the peer port,
|
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pass it to the bridge. */
|
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virtual Packet* recvRetry();
|
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|
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/** When reciving a Atomic requestfrom the peer port,
|
||||
/** When receiving a Atomic requestfrom the peer port,
|
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pass it to the bridge. */
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virtual Tick recvAtomic(Packet *pkt)
|
||||
{ return bridge->recvAtomic(pkt, side); }
|
||||
virtual Tick recvAtomic(Packet *pkt);
|
||||
|
||||
/** When reciving a Functional request from the peer port,
|
||||
/** When receiving a Functional request from the peer port,
|
||||
pass it to the bridge. */
|
||||
virtual void recvFunctional(Packet *pkt)
|
||||
{ bridge->recvFunctional(pkt, side); }
|
||||
virtual void recvFunctional(Packet *pkt);
|
||||
|
||||
/** When reciving a status changefrom the peer port,
|
||||
/** When receiving a status changefrom the peer port,
|
||||
pass it to the bridge. */
|
||||
virtual void recvStatusChange(Status status)
|
||||
{ bridge->recvStatusChange(status, side); }
|
||||
virtual void recvStatusChange(Status status);
|
||||
|
||||
/** When reciving a address range request the peer port,
|
||||
/** When receiving a address range request the peer port,
|
||||
pass it to the bridge. */
|
||||
virtual void getDeviceAddressRanges(AddrRangeList &resp, AddrRangeList &snoop)
|
||||
{ bridge->addressRanges(resp, snoop, side); }
|
||||
|
||||
friend class Bridge;
|
||||
virtual void getDeviceAddressRanges(AddrRangeList &resp,
|
||||
AddrRangeList &snoop);
|
||||
};
|
||||
|
||||
class SendEvent : public Event
|
||||
{
|
||||
Bridge *bridge;
|
||||
|
||||
SendEvent(Bridge *b)
|
||||
: Event(&mainEventQueue), bridge(b) {}
|
||||
|
||||
virtual void process() { bridge->timerEvent(); }
|
||||
|
||||
virtual const char *description() { return "bridge delay event"; }
|
||||
friend class Bridge;
|
||||
};
|
||||
|
||||
SendEvent sendEvent;
|
||||
|
||||
/** Sides of the bus bridges. */
|
||||
BridgePort* sideA;
|
||||
BridgePort* sideB;
|
||||
|
||||
/** inbound queues on both sides. */
|
||||
std::list<std::pair<Packet*, Tick> > inboundA;
|
||||
std::list<std::pair<Packet*, Tick> > inboundB;
|
||||
|
||||
/** The size of the queue for data coming into side a */
|
||||
int queueSizeA;
|
||||
int queueSizeB;
|
||||
|
||||
/* if the side is blocked or not. */
|
||||
bool blockedA;
|
||||
bool blockedB;
|
||||
|
||||
/** Miminum delay though this bridge. */
|
||||
Tick delay;
|
||||
BridgePort portA, portB;
|
||||
|
||||
/** If this bridge should acknowledge writes. */
|
||||
bool ackWrites;
|
||||
|
|
@ -179,36 +174,11 @@ class Bridge : public MemObject
|
|||
public:
|
||||
|
||||
/** A function used to return the port associated with this bus object. */
|
||||
virtual Port *getPort(const std::string &if_name)
|
||||
{
|
||||
if (if_name == "side_a") {
|
||||
if (sideA != NULL)
|
||||
panic("bridge side a already connected to.");
|
||||
sideA = new BridgePort(this, SideA);
|
||||
return sideA;
|
||||
} else if (if_name == "side_b") {
|
||||
if (sideB != NULL)
|
||||
panic("bridge side b already connected to.");
|
||||
sideB = new BridgePort(this, SideB);
|
||||
return sideB;
|
||||
} else
|
||||
return NULL;
|
||||
}
|
||||
virtual Port *getPort(const std::string &if_name);
|
||||
|
||||
virtual void init();
|
||||
|
||||
Bridge(const std::string &n, int qsa, int qsb, Tick _delay, int write_ack)
|
||||
: MemObject(n), sendEvent(this), sideA(NULL), sideB(NULL),
|
||||
queueSizeA(qsa), queueSizeB(qsb), blockedA(false), blockedB(false),
|
||||
delay(_delay), ackWrites(write_ack)
|
||||
{}
|
||||
|
||||
/** Check if the port should block/unblock after recieving/sending a packet.
|
||||
* */
|
||||
void blockCheck(Side id);
|
||||
|
||||
friend class Bridge::SendEvent;
|
||||
|
||||
Bridge(const std::string &n, int qsa, int qsb, Tick _delay, int write_ack);
|
||||
};
|
||||
|
||||
#endif //__MEM_BUS_HH__
|
||||
|
|
|
|||
Loading…
Reference in a new issue