void SMPCache::returnAccess(MemRequest *mreq)
{
SMPMemRequest *sreq = static_cast<SMPMemRequest *>(mreq);
MemOperation memOp = sreq->getMemOperation();
if(sreq->getRequestor() == this) {
// request from this cache (response is ready)
if(memOp == MemRead) {
protocol->readMissAckHandler(sreq);
}
else if(memOp == MemReadW) {
if(sreq->needsData()) {
protocol->writeMissAckHandler(sreq);
} else {
protocol->invalidateAckHandler(sreq);
}
}
else if(memOp == MemWrite) {
I(!sreq->needsData());
I(sreq->needsSnoop());
protocol->invalidateAckHandler(sreq);
}
else if(memOp == MemPush) {
protocol->writeBackAckHandler(sreq);
}
} else {
receiveFromBelow(sreq);
}
}
void SMPSystemBus::doWrite(MemRequest *mreq)
{
SMPMemRequest *sreq = static_cast<SMPMemRequest *>(mreq);
// no need to snoop, go straight to memory
if(!sreq->needsSnoop()) {
goToMem(mreq);
return;
}
if(pendReqsTable.find(mreq) == pendReqsTable.end()) {
unsigned numSnoops = getNumSnoopCaches(sreq);
// operation is starting now, add it to the pending requests buffer
pendReqsTable[mreq] = getNumSnoopCaches(sreq);
if(!numSnoops) {
// nothing to snoop on this chip
finalizeWrite(mreq);
return;
// TODO: even if there is only one processor on each chip,
// request is doing two rounds: snoop and memory
}
//VERSION COMBINING REGISTER ALLOCATED HERE
#ifdef TLS
if (mreq->isDataReq()&& sreq->needsData())VCRCount++;
#endif
// distribute requests to other caches, wait for responses
for(uint i = 0; i < upperLevel.size(); i++) {
if(upperLevel[i] != static_cast<SMPMemRequest *>(mreq)->getRequestor()) {
upperLevel[i]->returnAccess(mreq);
}
}
}
else {
// operation has already been sent to other caches, receive responses
I(pendReqsTable[mreq] > 0);
I(pendReqsTable[mreq] <= (int) upperLevel.size());
pendReqsTable[mreq]--;
if(pendReqsTable[mreq] != 0) {
// this is an intermediate response, request is not serviced yet
return;
}
// this is the final response, request can go up now
finalizeWrite(mreq);
}
}
void SMPSystemBus::doPush(MemRequest *mreq)
{
#ifdef TLS
SMPMemRequest *sreq = static_cast<SMPMemRequest *>(mreq);
TimeDelta_t VCRDelay;
PAddr addr= mreq->getPAddr();
// no need to snoop, go straight to memory
if(!sreq->needsSnoop()) {
goToMem(mreq);
return;
}
if(pendReqsTable.find(mreq) == pendReqsTable.end()) {
unsigned numSnoops = getNumSnoopCaches(sreq);
// operation is starting now, add it to the pending requests buffer
pendReqsTable[mreq] = getNumSnoopCaches(sreq);
VCRCount++;
// distribute requests to other caches, wait for responses
for(uint i = 0; i < upperLevel.size(); i++) {
if(upperLevel[i] != static_cast<SMPMemRequest *>(mreq)->getRequestor()) {
upperLevel[i]->returnAccess(mreq);
}
}
return;
}
else {
// operation has already been sent to other caches, receive responses
I(pendReqsTable[mreq] > 0);
I(pendReqsTable[mreq] <= (int) upperLevel.size());
pendReqsTable[mreq]--;
if(pendReqsTable[mreq] != 0) {
// this is an intermediate response, request is not serviced yet
return;
}
// this is the final response, Request will now be sent down
VCRDelay=finalizePush(mreq);
mreq->goDown(VCRDelay+delay, lowerLevel[0]);
}
#else
mreq->goDown(delay, lowerLevel[0]);
#endif
}
