lsq_unit_impl.hh revision 2693
12292SN/A/* 22292SN/A * Copyright (c) 2004-2005 The Regents of The University of Michigan 32292SN/A * All rights reserved. 42292SN/A * 52292SN/A * Redistribution and use in source and binary forms, with or without 62292SN/A * modification, are permitted provided that the following conditions are 72292SN/A * met: redistributions of source code must retain the above copyright 82292SN/A * notice, this list of conditions and the following disclaimer; 92292SN/A * redistributions in binary form must reproduce the above copyright 102292SN/A * notice, this list of conditions and the following disclaimer in the 112292SN/A * documentation and/or other materials provided with the distribution; 122292SN/A * neither the name of the copyright holders nor the names of its 132292SN/A * contributors may be used to endorse or promote products derived from 142292SN/A * this software without specific prior written permission. 152292SN/A * 162292SN/A * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 172292SN/A * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 182292SN/A * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 192292SN/A * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 202292SN/A * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 212292SN/A * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 222292SN/A * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 232292SN/A * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 242292SN/A * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 252292SN/A * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 262292SN/A * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 272689Sktlim@umich.edu * 282689Sktlim@umich.edu * Authors: Kevin Lim 292689Sktlim@umich.edu * Korey Sewell 302292SN/A */ 312292SN/A 322316SN/A#include "cpu/checker/cpu.hh" 332292SN/A#include "cpu/o3/lsq_unit.hh" 342292SN/A#include "base/str.hh" 352669Sktlim@umich.edu#include "mem/request.hh" 362292SN/A 372669Sktlim@umich.edutemplate<class Impl> 382678Sktlim@umich.eduLSQUnit<Impl>::WritebackEvent::WritebackEvent(DynInstPtr &_inst, PacketPtr _pkt, 392678Sktlim@umich.edu LSQUnit *lsq_ptr) 402678Sktlim@umich.edu : Event(&mainEventQueue), inst(_inst), pkt(_pkt), lsqPtr(lsq_ptr) 412292SN/A{ 422678Sktlim@umich.edu this->setFlags(Event::AutoDelete); 432292SN/A} 442292SN/A 452669Sktlim@umich.edutemplate<class Impl> 462292SN/Avoid 472678Sktlim@umich.eduLSQUnit<Impl>::WritebackEvent::process() 482292SN/A{ 492678Sktlim@umich.edu if (!lsqPtr->isSwitchedOut()) { 502678Sktlim@umich.edu lsqPtr->writeback(inst, pkt); 512678Sktlim@umich.edu } 522678Sktlim@umich.edu delete pkt; 532678Sktlim@umich.edu} 542292SN/A 552678Sktlim@umich.edutemplate<class Impl> 562678Sktlim@umich.educonst char * 572678Sktlim@umich.eduLSQUnit<Impl>::WritebackEvent::description() 582678Sktlim@umich.edu{ 592678Sktlim@umich.edu return "Store writeback event"; 602678Sktlim@umich.edu} 612292SN/A 622678Sktlim@umich.edutemplate<class Impl> 632678Sktlim@umich.eduvoid 642678Sktlim@umich.eduLSQUnit<Impl>::completeDataAccess(PacketPtr pkt) 652678Sktlim@umich.edu{ 662678Sktlim@umich.edu LSQSenderState *state = dynamic_cast<LSQSenderState *>(pkt->senderState); 672678Sktlim@umich.edu DynInstPtr inst = state->inst; 682678Sktlim@umich.edu DPRINTF(IEW, "Writeback event [sn:%lli]\n", inst->seqNum); 692678Sktlim@umich.edu// DPRINTF(Activity, "Activity: Ld Writeback event [sn:%lli]\n", inst->seqNum); 702344SN/A 712678Sktlim@umich.edu //iewStage->ldstQueue.removeMSHR(inst->threadNumber,inst->seqNum); 722678Sktlim@umich.edu 732678Sktlim@umich.edu if (isSwitchedOut() || inst->isSquashed()) { 742678Sktlim@umich.edu delete state; 752678Sktlim@umich.edu delete pkt; 762307SN/A return; 772678Sktlim@umich.edu } else { 782678Sktlim@umich.edu if (!state->noWB) { 792678Sktlim@umich.edu writeback(inst, pkt); 802678Sktlim@umich.edu } 812678Sktlim@umich.edu 822678Sktlim@umich.edu if (inst->isStore()) { 832678Sktlim@umich.edu completeStore(state->idx); 842678Sktlim@umich.edu } 852344SN/A } 862307SN/A 872678Sktlim@umich.edu delete state; 882678Sktlim@umich.edu delete pkt; 892292SN/A} 902292SN/A 912292SN/Atemplate <class Impl> 922669Sktlim@umich.eduTick 932669Sktlim@umich.eduLSQUnit<Impl>::DcachePort::recvAtomic(PacketPtr pkt) 942292SN/A{ 952669Sktlim@umich.edu panic("O3CPU model does not work with atomic mode!"); 962669Sktlim@umich.edu return curTick; 972669Sktlim@umich.edu} 982669Sktlim@umich.edu 992669Sktlim@umich.edutemplate <class Impl> 1002669Sktlim@umich.eduvoid 1012669Sktlim@umich.eduLSQUnit<Impl>::DcachePort::recvFunctional(PacketPtr pkt) 1022669Sktlim@umich.edu{ 1032669Sktlim@umich.edu panic("O3CPU doesn't expect recvFunctional callback!"); 1042669Sktlim@umich.edu} 1052669Sktlim@umich.edu 1062669Sktlim@umich.edutemplate <class Impl> 1072669Sktlim@umich.eduvoid 1082669Sktlim@umich.eduLSQUnit<Impl>::DcachePort::recvStatusChange(Status status) 1092669Sktlim@umich.edu{ 1102669Sktlim@umich.edu if (status == RangeChange) 1112669Sktlim@umich.edu return; 1122669Sktlim@umich.edu 1132669Sktlim@umich.edu panic("O3CPU doesn't expect recvStatusChange callback!"); 1142669Sktlim@umich.edu} 1152669Sktlim@umich.edu 1162669Sktlim@umich.edutemplate <class Impl> 1172669Sktlim@umich.edubool 1182669Sktlim@umich.eduLSQUnit<Impl>::DcachePort::recvTiming(PacketPtr pkt) 1192669Sktlim@umich.edu{ 1202669Sktlim@umich.edu lsq->completeDataAccess(pkt); 1212669Sktlim@umich.edu return true; 1222669Sktlim@umich.edu} 1232669Sktlim@umich.edu 1242669Sktlim@umich.edutemplate <class Impl> 1252669Sktlim@umich.eduvoid 1262669Sktlim@umich.eduLSQUnit<Impl>::DcachePort::recvRetry() 1272669Sktlim@umich.edu{ 1282693Sktlim@umich.edu lsq->recvRetry(); 1292292SN/A} 1302292SN/A 1312292SN/Atemplate <class Impl> 1322292SN/ALSQUnit<Impl>::LSQUnit() 1332678Sktlim@umich.edu : loads(0), stores(0), storesToWB(0), stalled(false), 1342678Sktlim@umich.edu isStoreBlocked(false), isLoadBlocked(false), 1352292SN/A loadBlockedHandled(false) 1362292SN/A{ 1372292SN/A} 1382292SN/A 1392292SN/Atemplate<class Impl> 1402292SN/Avoid 1412292SN/ALSQUnit<Impl>::init(Params *params, unsigned maxLQEntries, 1422292SN/A unsigned maxSQEntries, unsigned id) 1432292SN/A{ 1442292SN/A DPRINTF(LSQUnit, "Creating LSQUnit%i object.\n",id); 1452292SN/A 1462307SN/A switchedOut = false; 1472307SN/A 1482292SN/A lsqID = id; 1492292SN/A 1502329SN/A // Add 1 for the sentinel entry (they are circular queues). 1512329SN/A LQEntries = maxLQEntries + 1; 1522329SN/A SQEntries = maxSQEntries + 1; 1532292SN/A 1542292SN/A loadQueue.resize(LQEntries); 1552292SN/A storeQueue.resize(SQEntries); 1562292SN/A 1572292SN/A loadHead = loadTail = 0; 1582292SN/A 1592292SN/A storeHead = storeWBIdx = storeTail = 0; 1602292SN/A 1612292SN/A usedPorts = 0; 1622292SN/A cachePorts = params->cachePorts; 1632292SN/A 1642678Sktlim@umich.edu mem = params->mem; 1652292SN/A 1662329SN/A memDepViolator = NULL; 1672292SN/A 1682292SN/A blockedLoadSeqNum = 0; 1692292SN/A} 1702292SN/A 1712292SN/Atemplate<class Impl> 1722669Sktlim@umich.eduvoid 1732669Sktlim@umich.eduLSQUnit<Impl>::setCPU(FullCPU *cpu_ptr) 1742669Sktlim@umich.edu{ 1752669Sktlim@umich.edu cpu = cpu_ptr; 1762669Sktlim@umich.edu dcachePort = new DcachePort(cpu, this); 1772678Sktlim@umich.edu 1782678Sktlim@umich.edu Port *mem_dport = mem->getPort(""); 1792678Sktlim@umich.edu dcachePort->setPeer(mem_dport); 1802678Sktlim@umich.edu mem_dport->setPeer(dcachePort); 1812679Sktlim@umich.edu 1822679Sktlim@umich.edu if (cpu->checker) { 1832679Sktlim@umich.edu cpu->checker->setDcachePort(dcachePort); 1842679Sktlim@umich.edu } 1852669Sktlim@umich.edu} 1862669Sktlim@umich.edu 1872669Sktlim@umich.edutemplate<class Impl> 1882292SN/Astd::string 1892292SN/ALSQUnit<Impl>::name() const 1902292SN/A{ 1912292SN/A if (Impl::MaxThreads == 1) { 1922292SN/A return iewStage->name() + ".lsq"; 1932292SN/A } else { 1942292SN/A return iewStage->name() + ".lsq.thread." + to_string(lsqID); 1952292SN/A } 1962292SN/A} 1972292SN/A 1982292SN/Atemplate<class Impl> 1992292SN/Avoid 2002292SN/ALSQUnit<Impl>::clearLQ() 2012292SN/A{ 2022292SN/A loadQueue.clear(); 2032292SN/A} 2042292SN/A 2052292SN/Atemplate<class Impl> 2062292SN/Avoid 2072292SN/ALSQUnit<Impl>::clearSQ() 2082292SN/A{ 2092292SN/A storeQueue.clear(); 2102292SN/A} 2112292SN/A 2122292SN/A#if 0 2132292SN/Atemplate<class Impl> 2142292SN/Avoid 2152292SN/ALSQUnit<Impl>::setPageTable(PageTable *pt_ptr) 2162292SN/A{ 2172292SN/A DPRINTF(LSQUnit, "Setting the page table pointer.\n"); 2182292SN/A pTable = pt_ptr; 2192292SN/A} 2202292SN/A#endif 2212292SN/A 2222292SN/Atemplate<class Impl> 2232292SN/Avoid 2242307SN/ALSQUnit<Impl>::switchOut() 2252307SN/A{ 2262307SN/A switchedOut = true; 2272307SN/A for (int i = 0; i < loadQueue.size(); ++i) 2282307SN/A loadQueue[i] = NULL; 2292307SN/A 2302329SN/A assert(storesToWB == 0); 2312307SN/A} 2322307SN/A 2332307SN/Atemplate<class Impl> 2342307SN/Avoid 2352307SN/ALSQUnit<Impl>::takeOverFrom() 2362307SN/A{ 2372307SN/A switchedOut = false; 2382307SN/A loads = stores = storesToWB = 0; 2392307SN/A 2402307SN/A loadHead = loadTail = 0; 2412307SN/A 2422307SN/A storeHead = storeWBIdx = storeTail = 0; 2432307SN/A 2442307SN/A usedPorts = 0; 2452307SN/A 2462329SN/A memDepViolator = NULL; 2472307SN/A 2482307SN/A blockedLoadSeqNum = 0; 2492307SN/A 2502307SN/A stalled = false; 2512307SN/A isLoadBlocked = false; 2522307SN/A loadBlockedHandled = false; 2532307SN/A} 2542307SN/A 2552307SN/Atemplate<class Impl> 2562307SN/Avoid 2572292SN/ALSQUnit<Impl>::resizeLQ(unsigned size) 2582292SN/A{ 2592329SN/A unsigned size_plus_sentinel = size + 1; 2602329SN/A assert(size_plus_sentinel >= LQEntries); 2612292SN/A 2622329SN/A if (size_plus_sentinel > LQEntries) { 2632329SN/A while (size_plus_sentinel > loadQueue.size()) { 2642292SN/A DynInstPtr dummy; 2652292SN/A loadQueue.push_back(dummy); 2662292SN/A LQEntries++; 2672292SN/A } 2682292SN/A } else { 2692329SN/A LQEntries = size_plus_sentinel; 2702292SN/A } 2712292SN/A 2722292SN/A} 2732292SN/A 2742292SN/Atemplate<class Impl> 2752292SN/Avoid 2762292SN/ALSQUnit<Impl>::resizeSQ(unsigned size) 2772292SN/A{ 2782329SN/A unsigned size_plus_sentinel = size + 1; 2792329SN/A if (size_plus_sentinel > SQEntries) { 2802329SN/A while (size_plus_sentinel > storeQueue.size()) { 2812292SN/A SQEntry dummy; 2822292SN/A storeQueue.push_back(dummy); 2832292SN/A SQEntries++; 2842292SN/A } 2852292SN/A } else { 2862329SN/A SQEntries = size_plus_sentinel; 2872292SN/A } 2882292SN/A} 2892292SN/A 2902292SN/Atemplate <class Impl> 2912292SN/Avoid 2922292SN/ALSQUnit<Impl>::insert(DynInstPtr &inst) 2932292SN/A{ 2942292SN/A assert(inst->isMemRef()); 2952292SN/A 2962292SN/A assert(inst->isLoad() || inst->isStore()); 2972292SN/A 2982292SN/A if (inst->isLoad()) { 2992292SN/A insertLoad(inst); 3002292SN/A } else { 3012292SN/A insertStore(inst); 3022292SN/A } 3032292SN/A 3042292SN/A inst->setInLSQ(); 3052292SN/A} 3062292SN/A 3072292SN/Atemplate <class Impl> 3082292SN/Avoid 3092292SN/ALSQUnit<Impl>::insertLoad(DynInstPtr &load_inst) 3102292SN/A{ 3112329SN/A assert((loadTail + 1) % LQEntries != loadHead); 3122329SN/A assert(loads < LQEntries); 3132292SN/A 3142292SN/A DPRINTF(LSQUnit, "Inserting load PC %#x, idx:%i [sn:%lli]\n", 3152292SN/A load_inst->readPC(), loadTail, load_inst->seqNum); 3162292SN/A 3172292SN/A load_inst->lqIdx = loadTail; 3182292SN/A 3192292SN/A if (stores == 0) { 3202292SN/A load_inst->sqIdx = -1; 3212292SN/A } else { 3222292SN/A load_inst->sqIdx = storeTail; 3232292SN/A } 3242292SN/A 3252292SN/A loadQueue[loadTail] = load_inst; 3262292SN/A 3272292SN/A incrLdIdx(loadTail); 3282292SN/A 3292292SN/A ++loads; 3302292SN/A} 3312292SN/A 3322292SN/Atemplate <class Impl> 3332292SN/Avoid 3342292SN/ALSQUnit<Impl>::insertStore(DynInstPtr &store_inst) 3352292SN/A{ 3362292SN/A // Make sure it is not full before inserting an instruction. 3372292SN/A assert((storeTail + 1) % SQEntries != storeHead); 3382292SN/A assert(stores < SQEntries); 3392292SN/A 3402292SN/A DPRINTF(LSQUnit, "Inserting store PC %#x, idx:%i [sn:%lli]\n", 3412292SN/A store_inst->readPC(), storeTail, store_inst->seqNum); 3422292SN/A 3432292SN/A store_inst->sqIdx = storeTail; 3442292SN/A store_inst->lqIdx = loadTail; 3452292SN/A 3462292SN/A storeQueue[storeTail] = SQEntry(store_inst); 3472292SN/A 3482292SN/A incrStIdx(storeTail); 3492292SN/A 3502292SN/A ++stores; 3512292SN/A} 3522292SN/A 3532292SN/Atemplate <class Impl> 3542292SN/Atypename Impl::DynInstPtr 3552292SN/ALSQUnit<Impl>::getMemDepViolator() 3562292SN/A{ 3572292SN/A DynInstPtr temp = memDepViolator; 3582292SN/A 3592292SN/A memDepViolator = NULL; 3602292SN/A 3612292SN/A return temp; 3622292SN/A} 3632292SN/A 3642292SN/Atemplate <class Impl> 3652292SN/Aunsigned 3662292SN/ALSQUnit<Impl>::numFreeEntries() 3672292SN/A{ 3682292SN/A unsigned free_lq_entries = LQEntries - loads; 3692292SN/A unsigned free_sq_entries = SQEntries - stores; 3702292SN/A 3712292SN/A // Both the LQ and SQ entries have an extra dummy entry to differentiate 3722292SN/A // empty/full conditions. Subtract 1 from the free entries. 3732292SN/A if (free_lq_entries < free_sq_entries) { 3742292SN/A return free_lq_entries - 1; 3752292SN/A } else { 3762292SN/A return free_sq_entries - 1; 3772292SN/A } 3782292SN/A} 3792292SN/A 3802292SN/Atemplate <class Impl> 3812292SN/Aint 3822292SN/ALSQUnit<Impl>::numLoadsReady() 3832292SN/A{ 3842292SN/A int load_idx = loadHead; 3852292SN/A int retval = 0; 3862292SN/A 3872292SN/A while (load_idx != loadTail) { 3882292SN/A assert(loadQueue[load_idx]); 3892292SN/A 3902292SN/A if (loadQueue[load_idx]->readyToIssue()) { 3912292SN/A ++retval; 3922292SN/A } 3932292SN/A } 3942292SN/A 3952292SN/A return retval; 3962292SN/A} 3972292SN/A 3982292SN/Atemplate <class Impl> 3992292SN/AFault 4002292SN/ALSQUnit<Impl>::executeLoad(DynInstPtr &inst) 4012292SN/A{ 4022292SN/A // Execute a specific load. 4032292SN/A Fault load_fault = NoFault; 4042292SN/A 4052292SN/A DPRINTF(LSQUnit, "Executing load PC %#x, [sn:%lli]\n", 4062292SN/A inst->readPC(),inst->seqNum); 4072292SN/A 4082669Sktlim@umich.edu load_fault = inst->initiateAcc(); 4092292SN/A 4102292SN/A // If the instruction faulted, then we need to send it along to commit 4112292SN/A // without the instruction completing. 4122292SN/A if (load_fault != NoFault) { 4132329SN/A // Send this instruction to commit, also make sure iew stage 4142329SN/A // realizes there is activity. 4152292SN/A iewStage->instToCommit(inst); 4162292SN/A iewStage->activityThisCycle(); 4172292SN/A } 4182292SN/A 4192292SN/A return load_fault; 4202292SN/A} 4212292SN/A 4222292SN/Atemplate <class Impl> 4232292SN/AFault 4242292SN/ALSQUnit<Impl>::executeStore(DynInstPtr &store_inst) 4252292SN/A{ 4262292SN/A using namespace TheISA; 4272292SN/A // Make sure that a store exists. 4282292SN/A assert(stores != 0); 4292292SN/A 4302292SN/A int store_idx = store_inst->sqIdx; 4312292SN/A 4322292SN/A DPRINTF(LSQUnit, "Executing store PC %#x [sn:%lli]\n", 4332292SN/A store_inst->readPC(), store_inst->seqNum); 4342292SN/A 4352292SN/A // Check the recently completed loads to see if any match this store's 4362292SN/A // address. If so, then we have a memory ordering violation. 4372292SN/A int load_idx = store_inst->lqIdx; 4382292SN/A 4392292SN/A Fault store_fault = store_inst->initiateAcc(); 4402292SN/A 4412329SN/A if (storeQueue[store_idx].size == 0) { 4422292SN/A DPRINTF(LSQUnit,"Fault on Store PC %#x, [sn:%lli],Size = 0\n", 4432292SN/A store_inst->readPC(),store_inst->seqNum); 4442292SN/A 4452292SN/A return store_fault; 4462292SN/A } 4472292SN/A 4482292SN/A assert(store_fault == NoFault); 4492292SN/A 4502336SN/A if (store_inst->isStoreConditional()) { 4512336SN/A // Store conditionals need to set themselves as able to 4522336SN/A // writeback if we haven't had a fault by here. 4532329SN/A storeQueue[store_idx].canWB = true; 4542292SN/A 4552329SN/A ++storesToWB; 4562292SN/A } 4572292SN/A 4582292SN/A if (!memDepViolator) { 4592292SN/A while (load_idx != loadTail) { 4602329SN/A // Really only need to check loads that have actually executed 4612329SN/A // It's safe to check all loads because effAddr is set to 4622329SN/A // InvalAddr when the dyn inst is created. 4632292SN/A 4642329SN/A // @todo: For now this is extra conservative, detecting a 4652329SN/A // violation if the addresses match assuming all accesses 4662329SN/A // are quad word accesses. 4672329SN/A 4682292SN/A // @todo: Fix this, magic number being used here 4692292SN/A if ((loadQueue[load_idx]->effAddr >> 8) == 4702292SN/A (store_inst->effAddr >> 8)) { 4712292SN/A // A load incorrectly passed this store. Squash and refetch. 4722292SN/A // For now return a fault to show that it was unsuccessful. 4732292SN/A memDepViolator = loadQueue[load_idx]; 4742292SN/A 4752292SN/A return genMachineCheckFault(); 4762292SN/A } 4772292SN/A 4782292SN/A incrLdIdx(load_idx); 4792292SN/A } 4802292SN/A 4812292SN/A // If we've reached this point, there was no violation. 4822292SN/A memDepViolator = NULL; 4832292SN/A } 4842292SN/A 4852292SN/A return store_fault; 4862292SN/A} 4872292SN/A 4882292SN/Atemplate <class Impl> 4892292SN/Avoid 4902292SN/ALSQUnit<Impl>::commitLoad() 4912292SN/A{ 4922292SN/A assert(loadQueue[loadHead]); 4932292SN/A 4942292SN/A DPRINTF(LSQUnit, "Committing head load instruction, PC %#x\n", 4952292SN/A loadQueue[loadHead]->readPC()); 4962292SN/A 4972292SN/A loadQueue[loadHead] = NULL; 4982292SN/A 4992292SN/A incrLdIdx(loadHead); 5002292SN/A 5012292SN/A --loads; 5022292SN/A} 5032292SN/A 5042292SN/Atemplate <class Impl> 5052292SN/Avoid 5062292SN/ALSQUnit<Impl>::commitLoads(InstSeqNum &youngest_inst) 5072292SN/A{ 5082292SN/A assert(loads == 0 || loadQueue[loadHead]); 5092292SN/A 5102292SN/A while (loads != 0 && loadQueue[loadHead]->seqNum <= youngest_inst) { 5112292SN/A commitLoad(); 5122292SN/A } 5132292SN/A} 5142292SN/A 5152292SN/Atemplate <class Impl> 5162292SN/Avoid 5172292SN/ALSQUnit<Impl>::commitStores(InstSeqNum &youngest_inst) 5182292SN/A{ 5192292SN/A assert(stores == 0 || storeQueue[storeHead].inst); 5202292SN/A 5212292SN/A int store_idx = storeHead; 5222292SN/A 5232292SN/A while (store_idx != storeTail) { 5242292SN/A assert(storeQueue[store_idx].inst); 5252329SN/A // Mark any stores that are now committed and have not yet 5262329SN/A // been marked as able to write back. 5272292SN/A if (!storeQueue[store_idx].canWB) { 5282292SN/A if (storeQueue[store_idx].inst->seqNum > youngest_inst) { 5292292SN/A break; 5302292SN/A } 5312292SN/A DPRINTF(LSQUnit, "Marking store as able to write back, PC " 5322292SN/A "%#x [sn:%lli]\n", 5332292SN/A storeQueue[store_idx].inst->readPC(), 5342292SN/A storeQueue[store_idx].inst->seqNum); 5352292SN/A 5362292SN/A storeQueue[store_idx].canWB = true; 5372292SN/A 5382292SN/A ++storesToWB; 5392292SN/A } 5402292SN/A 5412292SN/A incrStIdx(store_idx); 5422292SN/A } 5432292SN/A} 5442292SN/A 5452292SN/Atemplate <class Impl> 5462292SN/Avoid 5472292SN/ALSQUnit<Impl>::writebackStores() 5482292SN/A{ 5492292SN/A while (storesToWB > 0 && 5502292SN/A storeWBIdx != storeTail && 5512292SN/A storeQueue[storeWBIdx].inst && 5522292SN/A storeQueue[storeWBIdx].canWB && 5532292SN/A usedPorts < cachePorts) { 5542292SN/A 5552678Sktlim@umich.edu if (isStoreBlocked) { 5562678Sktlim@umich.edu DPRINTF(LSQUnit, "Unable to write back any more stores, cache" 5572678Sktlim@umich.edu " is blocked!\n"); 5582678Sktlim@umich.edu break; 5592678Sktlim@umich.edu } 5602678Sktlim@umich.edu 5612329SN/A // Store didn't write any data so no need to write it back to 5622329SN/A // memory. 5632292SN/A if (storeQueue[storeWBIdx].size == 0) { 5642292SN/A completeStore(storeWBIdx); 5652292SN/A 5662292SN/A incrStIdx(storeWBIdx); 5672292SN/A 5682292SN/A continue; 5692292SN/A } 5702678Sktlim@umich.edu 5712292SN/A ++usedPorts; 5722292SN/A 5732292SN/A if (storeQueue[storeWBIdx].inst->isDataPrefetch()) { 5742292SN/A incrStIdx(storeWBIdx); 5752292SN/A 5762292SN/A continue; 5772292SN/A } 5782292SN/A 5792292SN/A assert(storeQueue[storeWBIdx].req); 5802292SN/A assert(!storeQueue[storeWBIdx].committed); 5812292SN/A 5822669Sktlim@umich.edu DynInstPtr inst = storeQueue[storeWBIdx].inst; 5832669Sktlim@umich.edu 5842669Sktlim@umich.edu Request *req = storeQueue[storeWBIdx].req; 5852292SN/A storeQueue[storeWBIdx].committed = true; 5862292SN/A 5872669Sktlim@umich.edu assert(!inst->memData); 5882669Sktlim@umich.edu inst->memData = new uint8_t[64]; 5892678Sktlim@umich.edu memcpy(inst->memData, (uint8_t *)&storeQueue[storeWBIdx].data, 5902678Sktlim@umich.edu req->getSize()); 5912669Sktlim@umich.edu 5922669Sktlim@umich.edu PacketPtr data_pkt = new Packet(req, Packet::WriteReq, Packet::Broadcast); 5932669Sktlim@umich.edu data_pkt->dataStatic(inst->memData); 5942292SN/A 5952678Sktlim@umich.edu LSQSenderState *state = new LSQSenderState; 5962678Sktlim@umich.edu state->isLoad = false; 5972678Sktlim@umich.edu state->idx = storeWBIdx; 5982678Sktlim@umich.edu state->inst = inst; 5992678Sktlim@umich.edu data_pkt->senderState = state; 6002678Sktlim@umich.edu 6012292SN/A DPRINTF(LSQUnit, "D-Cache: Writing back store idx:%i PC:%#x " 6022292SN/A "to Addr:%#x, data:%#x [sn:%lli]\n", 6032669Sktlim@umich.edu storeWBIdx, storeQueue[storeWBIdx].inst->readPC(), 6042669Sktlim@umich.edu req->getPaddr(), *(inst->memData), 6052292SN/A storeQueue[storeWBIdx].inst->seqNum); 6062292SN/A 6072693Sktlim@umich.edu // @todo: Remove this SC hack once the memory system handles it. 6082693Sktlim@umich.edu if (req->getFlags() & LOCKED) { 6092693Sktlim@umich.edu if (req->getFlags() & UNCACHEABLE) { 6102693Sktlim@umich.edu req->setScResult(2); 6112693Sktlim@umich.edu } else { 6122693Sktlim@umich.edu if (cpu->lockFlag) { 6132693Sktlim@umich.edu req->setScResult(1); 6142693Sktlim@umich.edu } else { 6152693Sktlim@umich.edu req->setScResult(0); 6162693Sktlim@umich.edu // Hack: Instantly complete this store. 6172693Sktlim@umich.edu completeDataAccess(data_pkt); 6182693Sktlim@umich.edu incrStIdx(storeWBIdx); 6192693Sktlim@umich.edu continue; 6202693Sktlim@umich.edu } 6212693Sktlim@umich.edu } 6222693Sktlim@umich.edu } else { 6232693Sktlim@umich.edu // Non-store conditionals do not need a writeback. 6242693Sktlim@umich.edu state->noWB = true; 6252693Sktlim@umich.edu } 6262693Sktlim@umich.edu 6272669Sktlim@umich.edu if (!dcachePort->sendTiming(data_pkt)) { 6282669Sktlim@umich.edu // Need to handle becoming blocked on a store. 6292678Sktlim@umich.edu isStoreBlocked = true; 6302693Sktlim@umich.edu 6312693Sktlim@umich.edu assert(sendingPkt == NULL); 6322693Sktlim@umich.edu sendingPkt = data_pkt; 6332669Sktlim@umich.edu } else { 6342693Sktlim@umich.edu storePostSend(data_pkt); 6352292SN/A } 6362292SN/A } 6372292SN/A 6382292SN/A // Not sure this should set it to 0. 6392292SN/A usedPorts = 0; 6402292SN/A 6412292SN/A assert(stores >= 0 && storesToWB >= 0); 6422292SN/A} 6432292SN/A 6442292SN/A/*template <class Impl> 6452292SN/Avoid 6462292SN/ALSQUnit<Impl>::removeMSHR(InstSeqNum seqNum) 6472292SN/A{ 6482292SN/A list<InstSeqNum>::iterator mshr_it = find(mshrSeqNums.begin(), 6492292SN/A mshrSeqNums.end(), 6502292SN/A seqNum); 6512292SN/A 6522292SN/A if (mshr_it != mshrSeqNums.end()) { 6532292SN/A mshrSeqNums.erase(mshr_it); 6542292SN/A DPRINTF(LSQUnit, "Removing MSHR. count = %i\n",mshrSeqNums.size()); 6552292SN/A } 6562292SN/A}*/ 6572292SN/A 6582292SN/Atemplate <class Impl> 6592292SN/Avoid 6602292SN/ALSQUnit<Impl>::squash(const InstSeqNum &squashed_num) 6612292SN/A{ 6622292SN/A DPRINTF(LSQUnit, "Squashing until [sn:%lli]!" 6632329SN/A "(Loads:%i Stores:%i)\n", squashed_num, loads, stores); 6642292SN/A 6652292SN/A int load_idx = loadTail; 6662292SN/A decrLdIdx(load_idx); 6672292SN/A 6682292SN/A while (loads != 0 && loadQueue[load_idx]->seqNum > squashed_num) { 6692292SN/A DPRINTF(LSQUnit,"Load Instruction PC %#x squashed, " 6702292SN/A "[sn:%lli]\n", 6712292SN/A loadQueue[load_idx]->readPC(), 6722292SN/A loadQueue[load_idx]->seqNum); 6732292SN/A 6742292SN/A if (isStalled() && load_idx == stallingLoadIdx) { 6752292SN/A stalled = false; 6762292SN/A stallingStoreIsn = 0; 6772292SN/A stallingLoadIdx = 0; 6782292SN/A } 6792292SN/A 6802329SN/A // Clear the smart pointer to make sure it is decremented. 6812292SN/A loadQueue[load_idx]->squashed = true; 6822292SN/A loadQueue[load_idx] = NULL; 6832292SN/A --loads; 6842292SN/A 6852292SN/A // Inefficient! 6862292SN/A loadTail = load_idx; 6872292SN/A 6882292SN/A decrLdIdx(load_idx); 6892292SN/A } 6902292SN/A 6912292SN/A if (isLoadBlocked) { 6922292SN/A if (squashed_num < blockedLoadSeqNum) { 6932292SN/A isLoadBlocked = false; 6942292SN/A loadBlockedHandled = false; 6952292SN/A blockedLoadSeqNum = 0; 6962292SN/A } 6972292SN/A } 6982292SN/A 6992292SN/A int store_idx = storeTail; 7002292SN/A decrStIdx(store_idx); 7012292SN/A 7022292SN/A while (stores != 0 && 7032292SN/A storeQueue[store_idx].inst->seqNum > squashed_num) { 7042329SN/A // Instructions marked as can WB are already committed. 7052292SN/A if (storeQueue[store_idx].canWB) { 7062292SN/A break; 7072292SN/A } 7082292SN/A 7092292SN/A DPRINTF(LSQUnit,"Store Instruction PC %#x squashed, " 7102292SN/A "idx:%i [sn:%lli]\n", 7112292SN/A storeQueue[store_idx].inst->readPC(), 7122292SN/A store_idx, storeQueue[store_idx].inst->seqNum); 7132292SN/A 7142329SN/A // I don't think this can happen. It should have been cleared 7152329SN/A // by the stalling load. 7162292SN/A if (isStalled() && 7172292SN/A storeQueue[store_idx].inst->seqNum == stallingStoreIsn) { 7182292SN/A panic("Is stalled should have been cleared by stalling load!\n"); 7192292SN/A stalled = false; 7202292SN/A stallingStoreIsn = 0; 7212292SN/A } 7222292SN/A 7232329SN/A // Clear the smart pointer to make sure it is decremented. 7242292SN/A storeQueue[store_idx].inst->squashed = true; 7252292SN/A storeQueue[store_idx].inst = NULL; 7262292SN/A storeQueue[store_idx].canWB = 0; 7272292SN/A 7282292SN/A storeQueue[store_idx].req = NULL; 7292292SN/A --stores; 7302292SN/A 7312292SN/A // Inefficient! 7322292SN/A storeTail = store_idx; 7332292SN/A 7342292SN/A decrStIdx(store_idx); 7352292SN/A } 7362292SN/A} 7372292SN/A 7382292SN/Atemplate <class Impl> 7392292SN/Avoid 7402693Sktlim@umich.eduLSQUnit<Impl>::storePostSend(Packet *pkt) 7412693Sktlim@umich.edu{ 7422693Sktlim@umich.edu if (isStalled() && 7432693Sktlim@umich.edu storeQueue[storeWBIdx].inst->seqNum == stallingStoreIsn) { 7442693Sktlim@umich.edu DPRINTF(LSQUnit, "Unstalling, stalling store [sn:%lli] " 7452693Sktlim@umich.edu "load idx:%i\n", 7462693Sktlim@umich.edu stallingStoreIsn, stallingLoadIdx); 7472693Sktlim@umich.edu stalled = false; 7482693Sktlim@umich.edu stallingStoreIsn = 0; 7492693Sktlim@umich.edu iewStage->replayMemInst(loadQueue[stallingLoadIdx]); 7502693Sktlim@umich.edu } 7512693Sktlim@umich.edu 7522693Sktlim@umich.edu if (!storeQueue[storeWBIdx].inst->isStoreConditional()) { 7532693Sktlim@umich.edu // The store is basically completed at this time. This 7542693Sktlim@umich.edu // only works so long as the checker doesn't try to 7552693Sktlim@umich.edu // verify the value in memory for stores. 7562693Sktlim@umich.edu storeQueue[storeWBIdx].inst->setCompleted(); 7572693Sktlim@umich.edu if (cpu->checker) { 7582693Sktlim@umich.edu cpu->checker->tick(storeQueue[storeWBIdx].inst); 7592693Sktlim@umich.edu } 7602693Sktlim@umich.edu } 7612693Sktlim@umich.edu 7622693Sktlim@umich.edu if (pkt->result != Packet::Success) { 7632693Sktlim@umich.edu DPRINTF(LSQUnit,"D-Cache Write Miss on idx:%i!\n", 7642693Sktlim@umich.edu storeWBIdx); 7652693Sktlim@umich.edu 7662693Sktlim@umich.edu DPRINTF(Activity, "Active st accessing mem miss [sn:%lli]\n", 7672693Sktlim@umich.edu storeQueue[storeWBIdx].inst->seqNum); 7682693Sktlim@umich.edu 7692693Sktlim@umich.edu //mshrSeqNums.push_back(storeQueue[storeWBIdx].inst->seqNum); 7702693Sktlim@umich.edu 7712693Sktlim@umich.edu //DPRINTF(LSQUnit, "Added MSHR. count = %i\n",mshrSeqNums.size()); 7722693Sktlim@umich.edu 7732693Sktlim@umich.edu // @todo: Increment stat here. 7742693Sktlim@umich.edu } else { 7752693Sktlim@umich.edu DPRINTF(LSQUnit,"D-Cache: Write Hit on idx:%i !\n", 7762693Sktlim@umich.edu storeWBIdx); 7772693Sktlim@umich.edu 7782693Sktlim@umich.edu DPRINTF(Activity, "Active st accessing mem hit [sn:%lli]\n", 7792693Sktlim@umich.edu storeQueue[storeWBIdx].inst->seqNum); 7802693Sktlim@umich.edu } 7812693Sktlim@umich.edu 7822693Sktlim@umich.edu incrStIdx(storeWBIdx); 7832693Sktlim@umich.edu} 7842693Sktlim@umich.edu 7852693Sktlim@umich.edutemplate <class Impl> 7862693Sktlim@umich.eduvoid 7872678Sktlim@umich.eduLSQUnit<Impl>::writeback(DynInstPtr &inst, PacketPtr pkt) 7882678Sktlim@umich.edu{ 7892678Sktlim@umich.edu iewStage->wakeCPU(); 7902678Sktlim@umich.edu 7912678Sktlim@umich.edu // Squashed instructions do not need to complete their access. 7922678Sktlim@umich.edu if (inst->isSquashed()) { 7932678Sktlim@umich.edu assert(!inst->isStore()); 7942678Sktlim@umich.edu return; 7952678Sktlim@umich.edu } 7962678Sktlim@umich.edu 7972678Sktlim@umich.edu if (!inst->isExecuted()) { 7982678Sktlim@umich.edu inst->setExecuted(); 7992678Sktlim@umich.edu 8002678Sktlim@umich.edu // Complete access to copy data to proper place. 8012678Sktlim@umich.edu inst->completeAcc(pkt); 8022678Sktlim@umich.edu } 8032678Sktlim@umich.edu 8042678Sktlim@umich.edu // Need to insert instruction into queue to commit 8052678Sktlim@umich.edu iewStage->instToCommit(inst); 8062678Sktlim@umich.edu 8072678Sktlim@umich.edu iewStage->activityThisCycle(); 8082678Sktlim@umich.edu} 8092678Sktlim@umich.edu 8102678Sktlim@umich.edutemplate <class Impl> 8112678Sktlim@umich.eduvoid 8122292SN/ALSQUnit<Impl>::completeStore(int store_idx) 8132292SN/A{ 8142292SN/A assert(storeQueue[store_idx].inst); 8152292SN/A storeQueue[store_idx].completed = true; 8162292SN/A --storesToWB; 8172292SN/A // A bit conservative because a store completion may not free up entries, 8182292SN/A // but hopefully avoids two store completions in one cycle from making 8192292SN/A // the CPU tick twice. 8202292SN/A cpu->activityThisCycle(); 8212292SN/A 8222292SN/A if (store_idx == storeHead) { 8232292SN/A do { 8242292SN/A incrStIdx(storeHead); 8252292SN/A 8262292SN/A --stores; 8272292SN/A } while (storeQueue[storeHead].completed && 8282292SN/A storeHead != storeTail); 8292292SN/A 8302292SN/A iewStage->updateLSQNextCycle = true; 8312292SN/A } 8322292SN/A 8332329SN/A DPRINTF(LSQUnit, "Completing store [sn:%lli], idx:%i, store head " 8342329SN/A "idx:%i\n", 8352329SN/A storeQueue[store_idx].inst->seqNum, store_idx, storeHead); 8362292SN/A 8372292SN/A if (isStalled() && 8382292SN/A storeQueue[store_idx].inst->seqNum == stallingStoreIsn) { 8392292SN/A DPRINTF(LSQUnit, "Unstalling, stalling store [sn:%lli] " 8402292SN/A "load idx:%i\n", 8412292SN/A stallingStoreIsn, stallingLoadIdx); 8422292SN/A stalled = false; 8432292SN/A stallingStoreIsn = 0; 8442292SN/A iewStage->replayMemInst(loadQueue[stallingLoadIdx]); 8452292SN/A } 8462316SN/A 8472316SN/A storeQueue[store_idx].inst->setCompleted(); 8482329SN/A 8492329SN/A // Tell the checker we've completed this instruction. Some stores 8502329SN/A // may get reported twice to the checker, but the checker can 8512329SN/A // handle that case. 8522316SN/A if (cpu->checker) { 8532316SN/A cpu->checker->tick(storeQueue[store_idx].inst); 8542316SN/A } 8552292SN/A} 8562292SN/A 8572292SN/Atemplate <class Impl> 8582693Sktlim@umich.eduvoid 8592693Sktlim@umich.eduLSQUnit<Impl>::recvRetry() 8602693Sktlim@umich.edu{ 8612693Sktlim@umich.edu assert(sendingPkt != NULL); 8622693Sktlim@umich.edu 8632693Sktlim@umich.edu if (isStoreBlocked) { 8642693Sktlim@umich.edu if (dcachePort->sendTiming(sendingPkt)) { 8652693Sktlim@umich.edu storePostSend(sendingPkt); 8662693Sktlim@umich.edu sendingPkt = NULL; 8672693Sktlim@umich.edu isStoreBlocked = false; 8682693Sktlim@umich.edu } else { 8692693Sktlim@umich.edu // Still blocked! 8702693Sktlim@umich.edu } 8712693Sktlim@umich.edu } else if (isLoadBlocked) { 8722693Sktlim@umich.edu DPRINTF(LSQUnit, "Loads squash themselves and all younger insts, " 8732693Sktlim@umich.edu "no need to resend packet.\n"); 8742693Sktlim@umich.edu } else { 8752693Sktlim@umich.edu DPRINTF(LSQUnit, "Retry received but LSQ is no longer blocked.\n"); 8762693Sktlim@umich.edu } 8772693Sktlim@umich.edu} 8782693Sktlim@umich.edu 8792693Sktlim@umich.edutemplate <class Impl> 8802292SN/Ainline void 8812292SN/ALSQUnit<Impl>::incrStIdx(int &store_idx) 8822292SN/A{ 8832292SN/A if (++store_idx >= SQEntries) 8842292SN/A store_idx = 0; 8852292SN/A} 8862292SN/A 8872292SN/Atemplate <class Impl> 8882292SN/Ainline void 8892292SN/ALSQUnit<Impl>::decrStIdx(int &store_idx) 8902292SN/A{ 8912292SN/A if (--store_idx < 0) 8922292SN/A store_idx += SQEntries; 8932292SN/A} 8942292SN/A 8952292SN/Atemplate <class Impl> 8962292SN/Ainline void 8972292SN/ALSQUnit<Impl>::incrLdIdx(int &load_idx) 8982292SN/A{ 8992292SN/A if (++load_idx >= LQEntries) 9002292SN/A load_idx = 0; 9012292SN/A} 9022292SN/A 9032292SN/Atemplate <class Impl> 9042292SN/Ainline void 9052292SN/ALSQUnit<Impl>::decrLdIdx(int &load_idx) 9062292SN/A{ 9072292SN/A if (--load_idx < 0) 9082292SN/A load_idx += LQEntries; 9092292SN/A} 9102329SN/A 9112329SN/Atemplate <class Impl> 9122329SN/Avoid 9132329SN/ALSQUnit<Impl>::dumpInsts() 9142329SN/A{ 9152329SN/A cprintf("Load store queue: Dumping instructions.\n"); 9162329SN/A cprintf("Load queue size: %i\n", loads); 9172329SN/A cprintf("Load queue: "); 9182329SN/A 9192329SN/A int load_idx = loadHead; 9202329SN/A 9212329SN/A while (load_idx != loadTail && loadQueue[load_idx]) { 9222329SN/A cprintf("%#x ", loadQueue[load_idx]->readPC()); 9232329SN/A 9242329SN/A incrLdIdx(load_idx); 9252329SN/A } 9262329SN/A 9272329SN/A cprintf("Store queue size: %i\n", stores); 9282329SN/A cprintf("Store queue: "); 9292329SN/A 9302329SN/A int store_idx = storeHead; 9312329SN/A 9322329SN/A while (store_idx != storeTail && storeQueue[store_idx].inst) { 9332329SN/A cprintf("%#x ", storeQueue[store_idx].inst->readPC()); 9342329SN/A 9352329SN/A incrStIdx(store_idx); 9362329SN/A } 9372329SN/A 9382329SN/A cprintf("\n"); 9392329SN/A} 940