*/
#include "mem/cache/base_cache.hh"
+#include "mem/cache/miss/mshr.hh"
+#include "mem/packet_impl.hh"
#include "cpu/smt.hh"
#include "cpu/base.hh"
: Port(_name), cache(_cache), isCpuSide(_isCpuSide)
{
blocked = false;
+ waitingOnRetry = false;
//Start ports at null if more than one is created we should panic
//cpuSidePort = NULL;
//memSidePort = NULL;
bool
BaseCache::CachePort::recvTiming(Packet *pkt)
{
- if (blocked)
+ if (isCpuSide
+ && !pkt->req->isUncacheable()
+ && pkt->isInvalidate()
+ && !pkt->isRead() && !pkt->isWrite()) {
+ //Upgrade or Invalidate
+ //Look into what happens if two slave caches on bus
+ DPRINTF(Cache, "%s %x ? blk_addr: %x\n", pkt->cmdString(),
+ pkt->getAddr() & (((ULL(1))<<48)-1),
+ pkt->getAddr() & ~((Addr)cache->blkSize - 1));
+
+ assert(!(pkt->flags & SATISFIED));
+ pkt->flags |= SATISFIED;
+ //Invalidates/Upgrades need no response if they get the bus
+ return true;
+ }
+
+ if (pkt->isRequest() && blocked)
{
DPRINTF(Cache,"Scheduling a retry while blocked\n");
mustSendRetry = true;
void
BaseCache::CachePort::recvFunctional(Packet *pkt)
{
+ //Check storage here first
+ list<Packet *>::iterator i = drainList.begin();
+ list<Packet *>::iterator end = drainList.end();
+ for (; i != end; ++i) {
+ Packet * target = *i;
+ // If the target contains data, and it overlaps the
+ // probed request, need to update data
+ if (target->intersect(pkt)) {
+ uint8_t* pkt_data;
+ uint8_t* write_data;
+ int data_size;
+ if (target->getAddr() < pkt->getAddr()) {
+ int offset = pkt->getAddr() - target->getAddr();
+ pkt_data = pkt->getPtr<uint8_t>();
+ write_data = target->getPtr<uint8_t>() + offset;
+ data_size = target->getSize() - offset;
+ assert(data_size > 0);
+ if (data_size > pkt->getSize())
+ data_size = pkt->getSize();
+ } else {
+ int offset = target->getAddr() - pkt->getAddr();
+ pkt_data = pkt->getPtr<uint8_t>() + offset;
+ write_data = target->getPtr<uint8_t>();
+ data_size = pkt->getSize() - offset;
+ assert(data_size > pkt->getSize());
+ if (data_size > target->getSize())
+ data_size = target->getSize();
+ }
+
+ if (pkt->isWrite()) {
+ memcpy(pkt_data, write_data, data_size);
+ } else {
+ memcpy(write_data, pkt_data, data_size);
+ }
+ }
+ }
cache->doFunctionalAccess(pkt, isCpuSide);
}
BaseCache::CachePort::recvRetry()
{
Packet *pkt;
+ assert(waitingOnRetry);
if (!drainList.empty()) {
+ DPRINTF(CachePort, "%s attempting to send a retry for response\n", name());
//We have some responses to drain first
- bool result = true;
- while (result && !drainList.empty()) {
- result = sendTiming(drainList.front());
- if (result)
- drainList.pop_front();
+ if (sendTiming(drainList.front())) {
+ DPRINTF(CachePort, "%s sucessful in sending a retry for response\n", name());
+ drainList.pop_front();
+ if (!drainList.empty() ||
+ !isCpuSide && cache->doMasterRequest() ||
+ isCpuSide && cache->doSlaveRequest()) {
+
+ DPRINTF(CachePort, "%s has more responses/requests\n", name());
+ BaseCache::CacheEvent * reqCpu = new BaseCache::CacheEvent(this);
+ reqCpu->schedule(curTick + 1);
+ }
+ waitingOnRetry = false;
}
}
-
- if (!isCpuSide)
+ else if (!isCpuSide)
{
+ DPRINTF(CachePort, "%s attempting to send a retry for MSHR\n", name());
+ if (!cache->doMasterRequest()) {
+ //This can happen if I am the owner of a block and see an upgrade
+ //while the block was in my WB Buffers. I just remove the
+ //wb and de-assert the masterRequest
+ waitingOnRetry = false;
+ return;
+ }
pkt = cache->getPacket();
+ MSHR* mshr = (MSHR*) pkt->senderState;
+ //Copy the packet, it may be modified/destroyed elsewhere
+ Packet * copyPkt = new Packet(*pkt);
+ copyPkt->dataStatic<uint8_t>(pkt->getPtr<uint8_t>());
+ mshr->pkt = copyPkt;
+
bool success = sendTiming(pkt);
DPRINTF(Cache, "Address %x was %s in sending the timing request\n",
pkt->getAddr(), success ? "succesful" : "unsuccesful");
- cache->sendResult(pkt, success);
+
+ waitingOnRetry = !success;
+ if (waitingOnRetry) {
+ DPRINTF(CachePort, "%s now waiting on a retry\n", name());
+ }
+
+ cache->sendResult(pkt, mshr, success);
+
if (success && cache->doMasterRequest())
{
+ DPRINTF(CachePort, "%s has more requests\n", name());
//Still more to issue, rerequest in 1 cycle
- pkt = NULL;
BaseCache::CacheEvent * reqCpu = new BaseCache::CacheEvent(this);
reqCpu->schedule(curTick + 1);
}
}
else
{
+ assert(cache->doSlaveRequest());
+ //pkt = cache->getCoherencePacket();
+ //We save the packet, no reordering on CSHRS
pkt = cache->getCoherencePacket();
+ MSHR* cshr = (MSHR*)pkt->senderState;
bool success = sendTiming(pkt);
+ cache->sendCoherenceResult(pkt, cshr, success);
+ waitingOnRetry = !success;
if (success && cache->doSlaveRequest())
{
+ DPRINTF(CachePort, "%s has more requests\n", name());
//Still more to issue, rerequest in 1 cycle
- pkt = NULL;
BaseCache::CacheEvent * reqCpu = new BaseCache::CacheEvent(this);
reqCpu->schedule(curTick + 1);
}
-
}
+ if (waitingOnRetry) DPRINTF(CachePort, "%s STILL Waiting on retry\n", name());
+ else DPRINTF(CachePort, "%s no longer waiting on retry\n", name());
return;
}
void
{
if (!pkt)
{
- if (!cachePort->isCpuSide)
- {
- //MSHR
+ if (cachePort->waitingOnRetry) return;
+ //We have some responses to drain first
+ if (!cachePort->drainList.empty()) {
+ DPRINTF(CachePort, "%s trying to drain a response\n", cachePort->name());
+ if (cachePort->sendTiming(cachePort->drainList.front())) {
+ DPRINTF(CachePort, "%s drains a response succesfully\n", cachePort->name());
+ cachePort->drainList.pop_front();
+ if (!cachePort->drainList.empty() ||
+ !cachePort->isCpuSide && cachePort->cache->doMasterRequest() ||
+ cachePort->isCpuSide && cachePort->cache->doSlaveRequest()) {
+
+ DPRINTF(CachePort, "%s still has outstanding bus reqs\n", cachePort->name());
+ this->schedule(curTick + 1);
+ }
+ }
+ else {
+ cachePort->waitingOnRetry = true;
+ DPRINTF(CachePort, "%s now waiting on a retry\n", cachePort->name());
+ }
+ }
+ else if (!cachePort->isCpuSide)
+ { //MSHR
+ DPRINTF(CachePort, "%s trying to send a MSHR request\n", cachePort->name());
+ if (!cachePort->cache->doMasterRequest()) {
+ //This can happen if I am the owner of a block and see an upgrade
+ //while the block was in my WB Buffers. I just remove the
+ //wb and de-assert the masterRequest
+ return;
+ }
+
pkt = cachePort->cache->getPacket();
+ MSHR* mshr = (MSHR*) pkt->senderState;
+ //Copy the packet, it may be modified/destroyed elsewhere
+ Packet * copyPkt = new Packet(*pkt);
+ copyPkt->dataStatic<uint8_t>(pkt->getPtr<uint8_t>());
+ mshr->pkt = copyPkt;
+
bool success = cachePort->sendTiming(pkt);
DPRINTF(Cache, "Address %x was %s in sending the timing request\n",
pkt->getAddr(), success ? "succesful" : "unsuccesful");
- cachePort->cache->sendResult(pkt, success);
+
+ cachePort->waitingOnRetry = !success;
+ if (cachePort->waitingOnRetry) {
+ DPRINTF(CachePort, "%s now waiting on a retry\n", cachePort->name());
+ }
+
+ cachePort->cache->sendResult(pkt, mshr, success);
if (success && cachePort->cache->doMasterRequest())
{
+ DPRINTF(CachePort, "%s still more MSHR requests to send\n",
+ cachePort->name());
//Still more to issue, rerequest in 1 cycle
pkt = NULL;
this->schedule(curTick+1);
else
{
//CSHR
+ assert(cachePort->cache->doSlaveRequest());
pkt = cachePort->cache->getCoherencePacket();
+ MSHR* cshr = (MSHR*) pkt->senderState;
bool success = cachePort->sendTiming(pkt);
+ cachePort->cache->sendResult(pkt, cshr, success);
+ cachePort->waitingOnRetry = !success;
+ if (cachePort->waitingOnRetry)
+ DPRINTF(CachePort, "%s now waiting on a retry\n", cachePort->name());
if (success && cachePort->cache->doSlaveRequest())
{
+ DPRINTF(CachePort, "%s still more CSHR requests to send\n",
+ cachePort->name());
//Still more to issue, rerequest in 1 cycle
pkt = NULL;
this->schedule(curTick+1);
}
//Response
//Know the packet to send
- pkt->result = Packet::Success;
+ if (pkt->flags & NACKED_LINE)
+ pkt->result = Packet::Nacked;
+ else
+ pkt->result = Packet::Success;
pkt->makeTimingResponse();
- if (!drainList.empty()) {
- //Already blocked waiting for bus, just append
+ DPRINTF(CachePort, "%s attempting to send a response\n", cachePort->name());
+ if (!cachePort->drainList.empty() || cachePort->waitingOnRetry) {
+ //Already have a list, just append
cachePort->drainList.push_back(pkt);
+ DPRINTF(CachePort, "%s appending response onto drain list\n", cachePort->name());
}
else if (!cachePort->sendTiming(pkt)) {
//It failed, save it to list of drain events
+ DPRINTF(CachePort, "%s now waiting for a retry\n", cachePort->name());
cachePort->drainList.push_back(pkt);
+ cachePort->waitingOnRetry = true;
}
}
projects / gem5.git / blobdiff