diff options
Diffstat (limited to 'src/cpu/inorder/resources/cache_unit.cc')
-rw-r--r-- | src/cpu/inorder/resources/cache_unit.cc | 395 |
1 files changed, 261 insertions, 134 deletions
diff --git a/src/cpu/inorder/resources/cache_unit.cc b/src/cpu/inorder/resources/cache_unit.cc index 0da4e968e..83eb617aa 100644 --- a/src/cpu/inorder/resources/cache_unit.cc +++ b/src/cpu/inorder/resources/cache_unit.cc @@ -391,17 +391,18 @@ CacheUnit::setupMemRequest(DynInstPtr inst, CacheReqPtr cache_req, Addr aligned_addr = inst->getMemAddr(); if (!cache_req->is2ndSplit()) { - if (inst->dataMemReq == NULL) { - inst->dataMemReq = + if (cache_req->memReq == NULL) { + cache_req->memReq = new Request(cpu->asid[tid], aligned_addr, acc_size, flags, inst->instAddr(), cpu->readCpuId(), tid); - cache_req->memReq = inst->dataMemReq; + DPRINTF(InOrderCachePort, "[sn:%i] Created memReq @%x, ->%x\n", + inst->seqNum, &cache_req->memReq, cache_req->memReq); } } else { assert(inst->splitInst); - if (inst->splitMemReq == NULL) { + if (inst->splitMemReq == NULL) { inst->splitMemReq = new Request(cpu->asid[tid], inst->split2ndAddr, acc_size, @@ -636,8 +637,6 @@ CacheUnit::write(DynInstPtr inst, uint8_t *data, unsigned size, // ============================== inst->split2ndSize = addr + fullSize - secondAddr; inst->split2ndAddr = secondAddr; - inst->split2ndStoreDataPtr = &cache_req->inst->storeData; - inst->split2ndStoreDataPtr += size; inst->split2ndFlags = flags; inst->splitInstSked = true; } @@ -645,7 +644,13 @@ CacheUnit::write(DynInstPtr inst, uint8_t *data, unsigned size, doTLBAccess(inst, cache_req, size, flags, TheISA::TLB::Write); if (inst->fault == NoFault) { - if (!cache_req->splitAccess) { + if (!cache_req->splitAccess) { + cache_req->reqData = new uint8_t[size]; + memcpy(cache_req->reqData, data, size); + + //inst->split2ndStoreDataPtr = cache_req->reqData; + //inst->split2ndStoreDataPtr += size; + doCacheAccess(inst, write_res); } else { doCacheAccess(inst, write_res, cache_req); @@ -734,17 +739,13 @@ CacheUnit::execute(int slot_num) break; case CompleteReadData: - case CompleteWriteData: DPRINTF(InOrderCachePort, - "[tid:%i]: [sn:%i]: Trying to Complete Data Access\n", + "[tid:%i]: [sn:%i]: Trying to Complete Data Read Access\n", tid, inst->seqNum); - - if (cache_req->isMemAccComplete() || - inst->isDataPrefetch() || - inst->isInstPrefetch()) { - removeAddrDependency(inst); - cache_req->setMemStall(false); - cache_req->done(); + //@todo: timing translations need to check here... + assert(!inst->isInstPrefetch() && "Can't Handle Inst. Prefecthes"); + if (cache_req->isMemAccComplete() || inst->isDataPrefetch()) { + finishCacheUnitReq(inst, cache_req); } else { DPRINTF(InOrderStall, "STALL: [tid:%i]: Data miss from %08p\n", tid, cache_req->inst->getMemAddr()); @@ -753,17 +754,44 @@ CacheUnit::execute(int slot_num) } break; + case CompleteWriteData: + DPRINTF(InOrderCachePort, + "[tid:%i]: [sn:%i]: Trying to Complete Data Write Access\n", + tid, inst->seqNum); + //@todo: check that timing translation is finished here + if (cache_req->dataPkt->isRead()) { + assert(cache_req->memReq->isCondSwap() || + cache_req->memReq->isLLSC() || + cache_req->memReq->isSwap()); + + if (!cache_req->isMemAccComplete()) { + DPRINTF(InOrderStall, "STALL: [tid:%i]: Data miss from %08p\n", + tid, cache_req->inst->getMemAddr()); + cache_req->setCompleted(false); + cache_req->setMemStall(true); + return; + } + } + + if (cache_req->isMemAccPending()) { + cache_req->dataPkt->reqData = cache_req->reqData; + cache_req->dataPkt->memReq = cache_req->memReq; + } + + //@todo: if split inst save data + + finishCacheUnitReq(inst, cache_req); + break; + case CompleteSecondSplitRead: DPRINTF(InOrderCachePort, "[tid:%i]: [sn:%i]: Trying to Complete Split Data Read " "Access\n", tid, inst->seqNum); - if (cache_req->isMemAccComplete() || - inst->isDataPrefetch() || - inst->isInstPrefetch()) { - removeAddrDependency(inst); - cache_req->setMemStall(false); - cache_req->done(); + //@todo: check that timing translation is finished here + assert(!inst->isInstPrefetch() && "Can't Handle Inst. Prefecthes"); + if (cache_req->isMemAccComplete() || inst->isDataPrefetch()) { + finishCacheUnitReq(inst, cache_req); } else { DPRINTF(InOrderStall, "STALL: [tid:%i]: Data miss from %08p\n", tid, cache_req->inst->split2ndAddr); @@ -776,19 +804,16 @@ CacheUnit::execute(int slot_num) DPRINTF(InOrderCachePort, "[tid:%i]: [sn:%i]: Trying to Complete Split Data Write " "Access\n", tid, inst->seqNum); + //@todo: illegal to have a unaligned cond.swap or llsc? + assert(!cache_req->memReq->isSwap() && !cache_req->memReq->isCondSwap() && !cache_req->memReq->isLLSC()); - if (cache_req->isMemAccComplete() || - inst->isDataPrefetch() || - inst->isInstPrefetch()) { - removeAddrDependency(inst); - cache_req->setMemStall(false); - cache_req->done(); - } else { - DPRINTF(InOrderStall, "STALL: [tid:%i]: Data miss from %08p\n", - tid, cache_req->inst->split2ndAddr); - cache_req->setCompleted(false); - cache_req->setMemStall(true); + if (cache_req->isMemAccPending()) { + cache_req->dataPkt->reqData = cache_req->reqData; + cache_req->dataPkt->memReq = cache_req->memReq; } + + //@todo: check that timing translation is finished here + finishCacheUnitReq(inst, cache_req); break; default: @@ -796,26 +821,17 @@ CacheUnit::execute(int slot_num) } } -// @TODO: Split into doCacheRead() and doCacheWrite() void -CacheUnit::doCacheAccess(DynInstPtr inst, uint64_t *write_res, - CacheReqPtr split_req) +CacheUnit::finishCacheUnitReq(DynInstPtr inst, CacheRequest *cache_req) { - Fault fault = NoFault; -#if TRACING_ON - ThreadID tid = inst->readTid(); -#endif - - CacheReqPtr cache_req; - - if (split_req == NULL) { - cache_req = dynamic_cast<CacheReqPtr>(reqs[inst->getCurResSlot()]); - } else{ - cache_req = split_req; - } - - assert(cache_req); + removeAddrDependency(inst); + cache_req->setMemStall(false); + cache_req->done(); +} +void +CacheUnit::buildDataPacket(CacheRequest *cache_req) +{ // Check for LL/SC and if so change command if (cache_req->memReq->isLLSC() && cache_req->pktCmd == MemCmd::ReadReq) { cache_req->pktCmd = MemCmd::LoadLockedReq; @@ -832,46 +848,61 @@ CacheUnit::doCacheAccess(DynInstPtr inst, uint64_t *write_res, cache_req->pktCmd, Packet::Broadcast, cache_req->instIdx); + DPRINTF(InOrderCachePort, "[slot:%i]: Slot marked for %x [pkt:%x->%x]\n", + cache_req->getSlot(), + cache_req->dataPkt->getAddr(), + &cache_req->dataPkt, + cache_req->dataPkt); + + cache_req->dataPkt->hasSlot = true; + cache_req->dataPkt->dataStatic(cache_req->reqData); +} - bool is_read = cache_req->dataPkt->isRead(); - bool is_write = cache_req->dataPkt->isWrite(); - - //@note: a compare and swap will both marked both read and write - if (is_read && !is_write) { - DPRINTF(InOrderCachePort, "Read Data Set in Packet\n"); +void +CacheUnit::doCacheAccess(DynInstPtr inst, uint64_t *write_res, + CacheReqPtr split_req) +{ + Fault fault = NoFault; +#if TRACING_ON + ThreadID tid = inst->readTid(); +#endif + bool do_access = true; // flag to suppress cache access - cache_req->dataPkt->dataStatic(cache_req->reqData); + // Special Handling if this is a split request + CacheReqPtr cache_req; + if (split_req == NULL) + cache_req = dynamic_cast<CacheReqPtr>(reqs[inst->getCurResSlot()]); + else { + cache_req = split_req; + assert(0); } - if (is_write) { - if (inst->split2ndAccess) { - cache_req->dataPkt->dataStatic(inst->split2ndStoreDataPtr); - } else { - cache_req->dataPkt->dataStatic(&cache_req->inst->storeData); - } - - DPRINTF(InOrderCachePort, - "[tid:%u]: [sn:%i]: Storing data: %s\n", - tid, inst->seqNum, - printMemData(cache_req->dataPkt->getPtr<uint8_t>(), - cache_req->dataPkt->getSize())); - - if (cache_req->memReq->isCondSwap()) { - assert(write_res); - cache_req->memReq->setExtraData(*write_res); + // Make a new packet inside the CacheRequest object + assert(cache_req); + buildDataPacket(cache_req); + + // Special Handling for LL/SC or Compare/Swap + bool is_write = cache_req->dataPkt->isWrite(); + RequestPtr mem_req = cache_req->dataPkt->req; + if (is_write) { + DPRINTF(InOrderCachePort, + "[tid:%u]: [sn:%i]: Storing data: %s\n", + tid, inst->seqNum, + printMemData(cache_req->dataPkt->getPtr<uint8_t>(), + cache_req->dataPkt->getSize())); + + if (mem_req->isCondSwap()) { + assert(write_res); + cache_req->memReq->setExtraData(*write_res); + } + if (mem_req->isLLSC()) { + assert(cache_req->inst->isStoreConditional()); + DPRINTF(InOrderCachePort, "Evaluating Store Conditional access\n"); + do_access = TheISA::handleLockedWrite(cpu, mem_req); } - } - - bool do_access = true; // flag to suppress cache access - - Request *memReq = cache_req->dataPkt->req; - - if (is_write && cache_req->memReq->isLLSC()) { - assert(cache_req->inst->isStoreConditional()); - DPRINTF(InOrderCachePort, "Evaluating Store Conditional access\n"); - do_access = TheISA::handleLockedWrite(cpu, memReq); - } + } + // Finally, go ahead and make the access if we can... DPRINTF(InOrderCachePort, "[tid:%i] [sn:%i] attempting to access cache for addr %08p\n", tid, inst->seqNum, cache_req->dataPkt->getAddr()); @@ -883,6 +914,11 @@ CacheUnit::doCacheAccess(DynInstPtr inst, uint64_t *write_res, "is blocked. now waiting to retry request\n", tid, inst->seqNum); delete cache_req->dataPkt; + cache_req->dataPkt = NULL; + + delete cache_req->memReq; + cache_req->memReq = NULL; + cache_req->done(false); cachePortBlocked = true; } else { @@ -893,7 +929,7 @@ CacheUnit::doCacheAccess(DynInstPtr inst, uint64_t *write_res, cache_req->setMemAccPending(); cachePortBlocked = false; } - } else if (!do_access && memReq->isLLSC()){ + } else if (mem_req->isLLSC()){ // Store-Conditional instructions complete even if they "failed" assert(cache_req->inst->isStoreConditional()); cache_req->setCompleted(true); @@ -905,6 +941,11 @@ CacheUnit::doCacheAccess(DynInstPtr inst, uint64_t *write_res, processCacheCompletion(cache_req->dataPkt); } else { delete cache_req->dataPkt; + cache_req->dataPkt = NULL; + + delete cache_req->memReq; + cache_req->memReq = NULL; + // Make cache request again since access due to // inability to access DPRINTF(InOrderStall, "STALL: \n"); @@ -913,39 +954,75 @@ CacheUnit::doCacheAccess(DynInstPtr inst, uint64_t *write_res, } -void -CacheUnit::processCacheCompletion(PacketPtr pkt) +bool +CacheUnit::processSquash(CacheReqPacket *cache_pkt) { - // Cast to correct packet type - CacheReqPacket* cache_pkt = dynamic_cast<CacheReqPacket*>(pkt); - - assert(cache_pkt); + // The resource may no longer be actively servicing this + // packet. Scenarios like a store that has been sent to the + // memory system or access that's been squashed. If that's + // the case, we can't access the request slot because it + // will be either invalid or servicing another request. + if (!cache_pkt->hasSlot) { + DPRINTF(InOrderCachePort, + "%x does not have a slot in unit, ignoring.\n", + cache_pkt->getAddr()); + + if (cache_pkt->reqData) { + delete [] cache_pkt->reqData; + cache_pkt->reqData = NULL; + } + + if (cache_pkt->memReq) { + delete cache_pkt->memReq; + cache_pkt->memReq = NULL; + } + + delete cache_pkt; + cache_pkt = NULL; + cpu->wakeCPU(); + return true; + } else { + DPRINTF(InOrderCachePort, "%x has slot %i\n", + cache_pkt->getAddr(), cache_pkt->cacheReq->getSlot()); + } + + // It's possible that the request is squashed but the + // packet is still acknowledged by the resource. Squashes + // should happen at the end of the cycles and trigger the + // code above, but if not, this would handle any timing + // variations due to diff. user parameters. if (cache_pkt->cacheReq->isSquashed()) { DPRINTF(InOrderCachePort, "Ignoring completion of squashed access, [tid:%i] [sn:%i]\n", cache_pkt->cacheReq->getInst()->readTid(), cache_pkt->cacheReq->getInst()->seqNum); - DPRINTF(RefCount, - "Ignoring completion of squashed access, [tid:%i] [sn:%i]\n", - cache_pkt->cacheReq->getTid(), - cache_pkt->cacheReq->seqNum); + cache_pkt->cacheReq->setMemAccPending(false); cache_pkt->cacheReq->freeSlot(); delete cache_pkt; - + cache_pkt = NULL; cpu->wakeCPU(); - - return; + return true; } - DPRINTF(InOrderCachePort, - "[tid:%u]: [sn:%i]: Waking from cache access to addr. %08p\n", - cache_pkt->cacheReq->getInst()->readTid(), - cache_pkt->cacheReq->getInst()->seqNum, - cache_pkt->cacheReq->getInst()->getMemAddr()); - // Cast to correct request type + return false; +} + +void +CacheUnit::processCacheCompletion(PacketPtr pkt) +{ + CacheReqPacket* cache_pkt = dynamic_cast<CacheReqPacket*>(pkt); + assert(cache_pkt); + + DPRINTF(InOrderCachePort, "Finished request for %x [pkt:%x->%x]\n", + pkt->getAddr(), &cache_pkt, cache_pkt); + + //@todo: process Squashed Completion + if (processSquash(cache_pkt)) + return; + CacheRequest *cache_req = dynamic_cast<CacheReqPtr>( findRequest(cache_pkt->cacheReq->getInst(), cache_pkt->instIdx)); @@ -957,7 +1034,15 @@ CacheUnit::processCacheCompletion(PacketPtr pkt) } assert(cache_req); + assert(cache_req == cache_pkt->cacheReq); + DPRINTF(InOrderCachePort, + "[tid:%u]: [sn:%i]: [slot:%i] Waking from cache access (vaddr.%08p, paddr:%08p)\n", + cache_pkt->cacheReq->getInst()->readTid(), + cache_pkt->cacheReq->getInst()->seqNum, + cache_req->getSlot(), + cache_pkt->req->getVaddr(), + cache_pkt->req->getPaddr()); // Get resource request info unsigned stage_num = cache_req->getStageNum(); @@ -971,8 +1056,8 @@ CacheUnit::processCacheCompletion(PacketPtr pkt) DPRINTF(InOrderCachePort, "[tid:%u]: [sn:%i]: Processing cache access\n", tid, inst->seqNum); - PacketPtr dataPkt = NULL; + PacketPtr split_pkt = NULL; if (inst->splitInst) { inst->splitFinishCnt++; @@ -983,22 +1068,18 @@ CacheUnit::processCacheCompletion(PacketPtr pkt) 0, 0); - Packet split_pkt(cache_req->memReq, cache_req->pktCmd, - Packet::Broadcast); + split_pkt = new Packet(cache_req->memReq, cache_req->pktCmd, + Packet::Broadcast); + split_pkt->dataStatic(inst->splitMemData); - - if (inst->isLoad()) { - split_pkt.dataStatic(inst->splitMemData); - } else { - split_pkt.dataStatic(&inst->storeData); - } - - dataPkt = &split_pkt; + DPRINTF(InOrderCachePort, "Completing Split Access.\n"); + inst->completeAcc(split_pkt); } } else { - dataPkt = pkt; + inst->completeAcc(cache_pkt); } - inst->completeAcc(dataPkt); + + inst->setExecuted(); if (inst->isLoad()) { assert(cache_pkt->isRead()); @@ -1013,19 +1094,30 @@ CacheUnit::processCacheCompletion(PacketPtr pkt) DPRINTF(InOrderCachePort, "[tid:%u]: [sn:%i]: Bytes loaded were: %s\n", tid, inst->seqNum, - printMemData(dataPkt->getPtr<uint8_t>(), - dataPkt->getSize())); + (split_pkt) ? printMemData(split_pkt->getPtr<uint8_t>(), + split_pkt->getSize()) : + printMemData(cache_pkt->getPtr<uint8_t>(), + cache_pkt->getSize())); } else if(inst->isStore()) { assert(cache_pkt->isWrite()); DPRINTF(InOrderCachePort, "[tid:%u]: [sn:%i]: Bytes stored were: %s\n", tid, inst->seqNum, - printMemData(dataPkt->getPtr<uint8_t>(), - dataPkt->getSize())); + (split_pkt) ? printMemData(split_pkt->getPtr<uint8_t>(), + split_pkt->getSize()) : + printMemData(cache_pkt->getPtr<uint8_t>(), + cache_pkt->getSize())); + } + + DPRINTF(InOrderCachePort, "Deleting packets %x (%x).\n", + cache_pkt, cache_req->dataPkt); + + if (split_pkt) { + delete split_pkt; + split_pkt = NULL; } - delete cache_pkt; cache_req->setMemAccPending(false); cache_req->setMemAccCompleted(); @@ -1093,6 +1185,10 @@ CacheUnitEvent::process() req_ptr->tlbStall = false; + //@todo: timing translation needs to have some type of independent + // info regarding if it's squashed or not so we can + // free up the resource if a request gets squashed in the middle + // of a table walk if (req_ptr->isSquashed()) { req_ptr->freeSlot(); } @@ -1177,21 +1273,52 @@ CacheUnit::squash(DynInstPtr inst, int stage_num, unsetResStall(reqs[req_slot_num], tid); } - if (!cache_req->tlbStall && !cache_req->isMemAccPending()) { - freeSlot(req_slot_num); - } else { - DPRINTF(InOrderCachePort, - "[tid:%i] Request from [sn:%i] squashed, but still " - "pending completion.\n", - req_ptr->getInst()->readTid(), req_ptr->getInst()->seqNum); - DPRINTF(RefCount, - "[tid:%i] Request from [sn:%i] squashed (split:%i), but " - "still pending completion.\n", - req_ptr->getInst()->readTid(), req_ptr->getInst()->seqNum, - req_ptr->getInst()->splitInst); + if (cache_req->isMemAccPending()) { + cache_req->dataPkt->reqData = cache_req->reqData; + cache_req->dataPkt->memReq = cache_req->memReq; } + + if (!cache_req->tlbStall) + freeSlot(req_slot_num); } } } +void +CacheRequest::clearRequest() +{ + if (!memAccPending) { + if (reqData && !splitAccess) + delete [] reqData; + + if (memReq) { + DPRINTF(InOrderCachePort, "Clearing request for %x...%x\n", + memReq->getVaddr(), (memReq->hasPaddr()) ? memReq->getPaddr() : 0); + delete memReq; + } + + if (dataPkt) + delete dataPkt; + } else { + if (dataPkt) { + dataPkt->hasSlot = false; + DPRINTF(InOrderCachePort, "[slot:%i]: Slot unmarked for %x for [pkt:%x->%x]\n", + getSlot(), dataPkt->getAddr(), &dataPkt, dataPkt); + } + } + + memReq = NULL; + reqData = NULL; + dataPkt = NULL; + memAccComplete = false; + memAccPending = false; + tlbStall = false; + splitAccess = false; + splitAccessNum = -1; + split2ndAccess = false; + instIdx = 0; + fetchBufferFill = false; + + ResourceRequest::clearRequest(); +} |