1 2/*
| 1 2/*
|
3 * Copyright (c) 2010-2014, 2017 ARM Limited
| 3 * Copyright (c) 2010-2014, 2017-2018 ARM Limited
|
4 * Copyright (c) 2013 Advanced Micro Devices, Inc. 5 * All rights reserved 6 * 7 * The license below extends only to copyright in the software and shall 8 * not be construed as granting a license to any other intellectual 9 * property including but not limited to intellectual property relating 10 * to a hardware implementation of the functionality of the software 11 * licensed hereunder. You may use the software subject to the license 12 * terms below provided that you ensure that this notice is replicated 13 * unmodified and in its entirety in all distributions of the software, 14 * modified or unmodified, in source code or in binary form. 15 * 16 * Copyright (c) 2004-2005 The Regents of The University of Michigan 17 * All rights reserved. 18 * 19 * Redistribution and use in source and binary forms, with or without 20 * modification, are permitted provided that the following conditions are 21 * met: redistributions of source code must retain the above copyright 22 * notice, this list of conditions and the following disclaimer; 23 * redistributions in binary form must reproduce the above copyright 24 * notice, this list of conditions and the following disclaimer in the 25 * documentation and/or other materials provided with the distribution; 26 * neither the name of the copyright holders nor the names of its 27 * contributors may be used to endorse or promote products derived from 28 * this software without specific prior written permission. 29 * 30 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 31 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 32 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 33 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 34 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 35 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 36 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 37 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 38 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 39 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 40 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 41 * 42 * Authors: Kevin Lim 43 * Korey Sewell 44 */ 45 46#ifndef __CPU_O3_LSQ_UNIT_IMPL_HH__ 47#define __CPU_O3_LSQ_UNIT_IMPL_HH__ 48 49#include "arch/generic/debugfaults.hh" 50#include "arch/locked_mem.hh" 51#include "base/str.hh" 52#include "config/the_isa.hh" 53#include "cpu/checker/cpu.hh" 54#include "cpu/o3/lsq.hh" 55#include "cpu/o3/lsq_unit.hh" 56#include "debug/Activity.hh" 57#include "debug/IEW.hh" 58#include "debug/LSQUnit.hh" 59#include "debug/O3PipeView.hh" 60#include "mem/packet.hh" 61#include "mem/request.hh" 62 63template<class Impl> 64LSQUnit<Impl>::WritebackEvent::WritebackEvent(const DynInstPtr &_inst, 65 PacketPtr _pkt, LSQUnit *lsq_ptr) 66 : Event(Default_Pri, AutoDelete), 67 inst(_inst), pkt(_pkt), lsqPtr(lsq_ptr) 68{
| 4 * Copyright (c) 2013 Advanced Micro Devices, Inc. 5 * All rights reserved 6 * 7 * The license below extends only to copyright in the software and shall 8 * not be construed as granting a license to any other intellectual 9 * property including but not limited to intellectual property relating 10 * to a hardware implementation of the functionality of the software 11 * licensed hereunder. You may use the software subject to the license 12 * terms below provided that you ensure that this notice is replicated 13 * unmodified and in its entirety in all distributions of the software, 14 * modified or unmodified, in source code or in binary form. 15 * 16 * Copyright (c) 2004-2005 The Regents of The University of Michigan 17 * All rights reserved. 18 * 19 * Redistribution and use in source and binary forms, with or without 20 * modification, are permitted provided that the following conditions are 21 * met: redistributions of source code must retain the above copyright 22 * notice, this list of conditions and the following disclaimer; 23 * redistributions in binary form must reproduce the above copyright 24 * notice, this list of conditions and the following disclaimer in the 25 * documentation and/or other materials provided with the distribution; 26 * neither the name of the copyright holders nor the names of its 27 * contributors may be used to endorse or promote products derived from 28 * this software without specific prior written permission. 29 * 30 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 31 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 32 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 33 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 34 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 35 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 36 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 37 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 38 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 39 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 40 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 41 * 42 * Authors: Kevin Lim 43 * Korey Sewell 44 */ 45 46#ifndef __CPU_O3_LSQ_UNIT_IMPL_HH__ 47#define __CPU_O3_LSQ_UNIT_IMPL_HH__ 48 49#include "arch/generic/debugfaults.hh" 50#include "arch/locked_mem.hh" 51#include "base/str.hh" 52#include "config/the_isa.hh" 53#include "cpu/checker/cpu.hh" 54#include "cpu/o3/lsq.hh" 55#include "cpu/o3/lsq_unit.hh" 56#include "debug/Activity.hh" 57#include "debug/IEW.hh" 58#include "debug/LSQUnit.hh" 59#include "debug/O3PipeView.hh" 60#include "mem/packet.hh" 61#include "mem/request.hh" 62 63template<class Impl> 64LSQUnit<Impl>::WritebackEvent::WritebackEvent(const DynInstPtr &_inst, 65 PacketPtr _pkt, LSQUnit *lsq_ptr) 66 : Event(Default_Pri, AutoDelete), 67 inst(_inst), pkt(_pkt), lsqPtr(lsq_ptr) 68{
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| 69 assert(_inst->savedReq); 70 _inst->savedReq->writebackScheduled();
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69} 70 71template<class Impl> 72void 73LSQUnit<Impl>::WritebackEvent::process() 74{ 75 assert(!lsqPtr->cpu->switchedOut()); 76 77 lsqPtr->writeback(inst, pkt); 78
| 71} 72 73template<class Impl> 74void 75LSQUnit<Impl>::WritebackEvent::process() 76{ 77 assert(!lsqPtr->cpu->switchedOut()); 78 79 lsqPtr->writeback(inst, pkt); 80
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79 if (pkt->senderState) 80 delete pkt->senderState; 81
| 81 assert(inst->savedReq); 82 inst->savedReq->writebackDone();
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82 delete pkt; 83} 84 85template<class Impl> 86const char * 87LSQUnit<Impl>::WritebackEvent::description() const 88{ 89 return "Store writeback"; 90} 91
| 83 delete pkt; 84} 85 86template<class Impl> 87const char * 88LSQUnit<Impl>::WritebackEvent::description() const 89{ 90 return "Store writeback"; 91} 92
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| 93template <class Impl> 94bool 95LSQUnit<Impl>::recvTimingResp(PacketPtr pkt) 96{ 97 auto senderState = dynamic_cast<LSQSenderState*>(pkt->senderState); 98 LSQRequest* req = senderState->request(); 99 assert(req != nullptr); 100 bool ret = true; 101 /* Check that the request is still alive before any further action. */ 102 if (senderState->alive()) { 103 ret = req->recvTimingResp(pkt); 104 } else { 105 senderState->outstanding--; 106 } 107 return ret; 108 109} 110
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92template<class Impl> 93void 94LSQUnit<Impl>::completeDataAccess(PacketPtr pkt) 95{ 96 LSQSenderState *state = dynamic_cast<LSQSenderState *>(pkt->senderState); 97 DynInstPtr inst = state->inst;
| 111template<class Impl> 112void 113LSQUnit<Impl>::completeDataAccess(PacketPtr pkt) 114{ 115 LSQSenderState *state = dynamic_cast<LSQSenderState *>(pkt->senderState); 116 DynInstPtr inst = state->inst;
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98 DPRINTF(IEW, "Writeback event [sn:%lli].\n", inst->seqNum); 99 DPRINTF(Activity, "Activity: Writeback event [sn:%lli].\n", inst->seqNum);
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100
| 117
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101 if (state->cacheBlocked) { 102 // This is the first half of a previous split load, 103 // where the 2nd half blocked, ignore this response 104 DPRINTF(IEW, "[sn:%lli]: Response from first half of earlier " 105 "blocked split load recieved. Ignoring.\n", inst->seqNum); 106 delete state; 107 return; 108 }
| 118 cpu->ppDataAccessComplete->notify(std::make_pair(inst, pkt));
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109
| 119
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110 // If this is a split access, wait until all packets are received. 111 if (TheISA::HasUnalignedMemAcc && !state->complete()) { 112 return; 113 }
| 120 /* Notify the sender state that the access is complete (for ownership 121 * tracking). */ 122 state->complete();
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114 115 assert(!cpu->switchedOut()); 116 if (!inst->isSquashed()) {
| 123 124 assert(!cpu->switchedOut()); 125 if (!inst->isSquashed()) {
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117 if (!state->noWB) {
| 126 if (state->needWB) {
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118 // Only loads and store conditionals perform the writeback 119 // after receving the response from the memory 120 assert(inst->isLoad() || inst->isStoreConditional());
| 127 // Only loads and store conditionals perform the writeback 128 // after receving the response from the memory 129 assert(inst->isLoad() || inst->isStoreConditional());
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121 if (!TheISA::HasUnalignedMemAcc || !state->isSplit || 122 !state->isLoad) { 123 writeback(inst, pkt); 124 } else { 125 writeback(inst, state->mainPkt);
| 130 writeback(inst, state->request()->mainPacket()); 131 if (inst->isStore()) { 132 auto ss = dynamic_cast<SQSenderState*>(state); 133 ss->writebackDone(); 134 completeStore(ss->idx);
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126 }
| 135 }
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| 136 } else if (inst->isStore()) { 137 completeStore(dynamic_cast<SQSenderState*>(state)->idx);
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127 }
| 138 }
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128 129 if (inst->isStore()) { 130 completeStore(state->idx); 131 }
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132 }
| 139 }
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133 134 if (TheISA::HasUnalignedMemAcc && state->isSplit && state->isLoad) { 135 delete state->mainPkt; 136 } 137 138 pkt->req->setAccessLatency(); 139 cpu->ppDataAccessComplete->notify(std::make_pair(inst, pkt)); 140 141 delete state;
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142} 143 144template <class Impl> 145LSQUnit<Impl>::LSQUnit(uint32_t lqEntries, uint32_t sqEntries) 146 : lsqID(-1), storeQueue(sqEntries+1), loadQueue(lqEntries+1),
| 140} 141 142template <class Impl> 143LSQUnit<Impl>::LSQUnit(uint32_t lqEntries, uint32_t sqEntries) 144 : lsqID(-1), storeQueue(sqEntries+1), loadQueue(lqEntries+1),
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147 LQEntries(lqEntries+1), SQEntries(sqEntries+1),
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148 loads(0), stores(0), storesToWB(0), cacheBlockMask(0), stalled(false),
| 145 loads(0), stores(0), storesToWB(0), cacheBlockMask(0), stalled(false),
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149 isStoreBlocked(false), storeInFlight(false), hasPendingPkt(false), 150 pendingPkt(nullptr)
| 146 isStoreBlocked(false), storeInFlight(false), hasPendingRequest(false), 147 pendingRequest(nullptr)
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151{ 152} 153 154template<class Impl> 155void 156LSQUnit<Impl>::init(O3CPU *cpu_ptr, IEW *iew_ptr, DerivO3CPUParams *params, 157 LSQ *lsq_ptr, unsigned id) 158{ 159 lsqID = id; 160 161 cpu = cpu_ptr; 162 iewStage = iew_ptr; 163 164 lsq = lsq_ptr; 165 166 DPRINTF(LSQUnit, "Creating LSQUnit%i object.\n",lsqID); 167 168 depCheckShift = params->LSQDepCheckShift; 169 checkLoads = params->LSQCheckLoads;
| 148{ 149} 150 151template<class Impl> 152void 153LSQUnit<Impl>::init(O3CPU *cpu_ptr, IEW *iew_ptr, DerivO3CPUParams *params, 154 LSQ *lsq_ptr, unsigned id) 155{ 156 lsqID = id; 157 158 cpu = cpu_ptr; 159 iewStage = iew_ptr; 160 161 lsq = lsq_ptr; 162 163 DPRINTF(LSQUnit, "Creating LSQUnit%i object.\n",lsqID); 164 165 depCheckShift = params->LSQDepCheckShift; 166 checkLoads = params->LSQCheckLoads;
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170 cacheStorePorts = params->cacheStorePorts;
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171 needsTSO = params->needsTSO; 172 173 resetState(); 174} 175 176 177template<class Impl> 178void 179LSQUnit<Impl>::resetState() 180{ 181 loads = stores = storesToWB = 0; 182
| 167 needsTSO = params->needsTSO; 168 169 resetState(); 170} 171 172 173template<class Impl> 174void 175LSQUnit<Impl>::resetState() 176{ 177 loads = stores = storesToWB = 0; 178
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183 loadHead = loadTail = 0;
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184
| 179
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185 storeHead = storeWBIdx = storeTail = 0;
| 180 storeWBIt = storeQueue.begin();
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186
| 181
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187 usedStorePorts = 0; 188
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189 retryPkt = NULL; 190 memDepViolator = NULL; 191 192 stalled = false; 193 194 cacheBlockMask = ~(cpu->cacheLineSize() - 1); 195} 196 197template<class Impl> 198std::string 199LSQUnit<Impl>::name() const 200{ 201 if (Impl::MaxThreads == 1) { 202 return iewStage->name() + ".lsq"; 203 } else { 204 return iewStage->name() + ".lsq.thread" + std::to_string(lsqID); 205 } 206} 207 208template<class Impl> 209void 210LSQUnit<Impl>::regStats() 211{ 212 lsqForwLoads 213 .name(name() + ".forwLoads") 214 .desc("Number of loads that had data forwarded from stores"); 215 216 invAddrLoads 217 .name(name() + ".invAddrLoads") 218 .desc("Number of loads ignored due to an invalid address"); 219 220 lsqSquashedLoads 221 .name(name() + ".squashedLoads") 222 .desc("Number of loads squashed"); 223 224 lsqIgnoredResponses 225 .name(name() + ".ignoredResponses") 226 .desc("Number of memory responses ignored because the instruction is squashed"); 227 228 lsqMemOrderViolation 229 .name(name() + ".memOrderViolation") 230 .desc("Number of memory ordering violations"); 231 232 lsqSquashedStores 233 .name(name() + ".squashedStores") 234 .desc("Number of stores squashed"); 235 236 invAddrSwpfs 237 .name(name() + ".invAddrSwpfs") 238 .desc("Number of software prefetches ignored due to an invalid address"); 239 240 lsqBlockedLoads 241 .name(name() + ".blockedLoads") 242 .desc("Number of blocked loads due to partial load-store forwarding"); 243 244 lsqRescheduledLoads 245 .name(name() + ".rescheduledLoads") 246 .desc("Number of loads that were rescheduled"); 247 248 lsqCacheBlocked 249 .name(name() + ".cacheBlocked") 250 .desc("Number of times an access to memory failed due to the cache being blocked"); 251} 252 253template<class Impl> 254void 255LSQUnit<Impl>::setDcachePort(MasterPort *dcache_port) 256{ 257 dcachePort = dcache_port; 258} 259 260template<class Impl> 261void
| 182 retryPkt = NULL; 183 memDepViolator = NULL; 184 185 stalled = false; 186 187 cacheBlockMask = ~(cpu->cacheLineSize() - 1); 188} 189 190template<class Impl> 191std::string 192LSQUnit<Impl>::name() const 193{ 194 if (Impl::MaxThreads == 1) { 195 return iewStage->name() + ".lsq"; 196 } else { 197 return iewStage->name() + ".lsq.thread" + std::to_string(lsqID); 198 } 199} 200 201template<class Impl> 202void 203LSQUnit<Impl>::regStats() 204{ 205 lsqForwLoads 206 .name(name() + ".forwLoads") 207 .desc("Number of loads that had data forwarded from stores"); 208 209 invAddrLoads 210 .name(name() + ".invAddrLoads") 211 .desc("Number of loads ignored due to an invalid address"); 212 213 lsqSquashedLoads 214 .name(name() + ".squashedLoads") 215 .desc("Number of loads squashed"); 216 217 lsqIgnoredResponses 218 .name(name() + ".ignoredResponses") 219 .desc("Number of memory responses ignored because the instruction is squashed"); 220 221 lsqMemOrderViolation 222 .name(name() + ".memOrderViolation") 223 .desc("Number of memory ordering violations"); 224 225 lsqSquashedStores 226 .name(name() + ".squashedStores") 227 .desc("Number of stores squashed"); 228 229 invAddrSwpfs 230 .name(name() + ".invAddrSwpfs") 231 .desc("Number of software prefetches ignored due to an invalid address"); 232 233 lsqBlockedLoads 234 .name(name() + ".blockedLoads") 235 .desc("Number of blocked loads due to partial load-store forwarding"); 236 237 lsqRescheduledLoads 238 .name(name() + ".rescheduledLoads") 239 .desc("Number of loads that were rescheduled"); 240 241 lsqCacheBlocked 242 .name(name() + ".cacheBlocked") 243 .desc("Number of times an access to memory failed due to the cache being blocked"); 244} 245 246template<class Impl> 247void 248LSQUnit<Impl>::setDcachePort(MasterPort *dcache_port) 249{ 250 dcachePort = dcache_port; 251} 252 253template<class Impl> 254void
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262LSQUnit<Impl>::clearLQ() 263{ 264 loadQueue.clear(); 265} 266 267template<class Impl> 268void 269LSQUnit<Impl>::clearSQ() 270{ 271 storeQueue.clear(); 272} 273 274template<class Impl> 275void
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276LSQUnit<Impl>::drainSanityCheck() const 277{
| 255LSQUnit<Impl>::drainSanityCheck() const 256{
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278 for (int i = 0; i < loadQueue.size(); ++i) 279 assert(!loadQueue[i]);
| 257 for (int i = 0; i < loadQueue.capacity(); ++i) 258 assert(!loadQueue[i].valid());
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280 281 assert(storesToWB == 0); 282 assert(!retryPkt); 283} 284 285template<class Impl> 286void 287LSQUnit<Impl>::takeOverFrom() 288{ 289 resetState(); 290} 291
| 259 260 assert(storesToWB == 0); 261 assert(!retryPkt); 262} 263 264template<class Impl> 265void 266LSQUnit<Impl>::takeOverFrom() 267{ 268 resetState(); 269} 270
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292template<class Impl> 293void 294LSQUnit<Impl>::resizeLQ(unsigned size) 295{ 296 unsigned size_plus_sentinel = size + 1; 297 assert(size_plus_sentinel >= LQEntries); 298 299 if (size_plus_sentinel > LQEntries) { 300 while (size_plus_sentinel > loadQueue.size()) { 301 DynInstPtr dummy; 302 loadQueue.push_back(dummy); 303 LQEntries++; 304 } 305 } else { 306 LQEntries = size_plus_sentinel; 307 } 308 309 assert(LQEntries <= 256); 310} 311 312template<class Impl> 313void 314LSQUnit<Impl>::resizeSQ(unsigned size) 315{ 316 unsigned size_plus_sentinel = size + 1; 317 if (size_plus_sentinel > SQEntries) { 318 while (size_plus_sentinel > storeQueue.size()) { 319 SQEntry dummy; 320 storeQueue.push_back(dummy); 321 SQEntries++; 322 } 323 } else { 324 SQEntries = size_plus_sentinel; 325 } 326 327 assert(SQEntries <= 256); 328} 329
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330template <class Impl> 331void 332LSQUnit<Impl>::insert(const DynInstPtr &inst) 333{ 334 assert(inst->isMemRef()); 335 336 assert(inst->isLoad() || inst->isStore()); 337 338 if (inst->isLoad()) { 339 insertLoad(inst); 340 } else { 341 insertStore(inst); 342 } 343 344 inst->setInLSQ(); 345} 346 347template <class Impl> 348void 349LSQUnit<Impl>::insertLoad(const DynInstPtr &load_inst) 350{
| 271template <class Impl> 272void 273LSQUnit<Impl>::insert(const DynInstPtr &inst) 274{ 275 assert(inst->isMemRef()); 276 277 assert(inst->isLoad() || inst->isStore()); 278 279 if (inst->isLoad()) { 280 insertLoad(inst); 281 } else { 282 insertStore(inst); 283 } 284 285 inst->setInLSQ(); 286} 287 288template <class Impl> 289void 290LSQUnit<Impl>::insertLoad(const DynInstPtr &load_inst) 291{
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351 assert((loadTail + 1) % LQEntries != loadHead); 352 assert(loads < LQEntries);
| 292 assert(!loadQueue.full()); 293 assert(loads < loadQueue.capacity());
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353 354 DPRINTF(LSQUnit, "Inserting load PC %s, idx:%i [sn:%lli]\n",
| 294 295 DPRINTF(LSQUnit, "Inserting load PC %s, idx:%i [sn:%lli]\n",
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355 load_inst->pcState(), loadTail, load_inst->seqNum);
| 296 load_inst->pcState(), loadQueue.tail(), load_inst->seqNum);
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356
| 297
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357 load_inst->lqIdx = loadTail;
| 298 /* Grow the queue. */ 299 loadQueue.advance_tail();
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358
| 300
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359 if (stores == 0) { 360 load_inst->sqIdx = -1; 361 } else { 362 load_inst->sqIdx = storeTail; 363 }
| 301 load_inst->sqIt = storeQueue.end();
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364
| 302
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365 loadQueue[loadTail] = load_inst;
| 303 assert(!loadQueue.back().valid()); 304 loadQueue.back().set(load_inst); 305 load_inst->lqIdx = loadQueue.tail(); 306 load_inst->lqIt = loadQueue.getIterator(load_inst->lqIdx);
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366
| 307
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367 incrLdIdx(loadTail); 368
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369 ++loads; 370} 371 372template <class Impl> 373void
| 308 ++loads; 309} 310 311template <class Impl> 312void
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374LSQUnit<Impl>::insertStore(const DynInstPtr &store_inst)
| 313LSQUnit<Impl>::insertStore(const DynInstPtr& store_inst)
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375{ 376 // Make sure it is not full before inserting an instruction.
| 314{ 315 // Make sure it is not full before inserting an instruction.
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377 assert((storeTail + 1) % SQEntries != storeHead); 378 assert(stores < SQEntries);
| 316 assert(!storeQueue.full()); 317 assert(stores < storeQueue.capacity());
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379 380 DPRINTF(LSQUnit, "Inserting store PC %s, idx:%i [sn:%lli]\n",
| 318 319 DPRINTF(LSQUnit, "Inserting store PC %s, idx:%i [sn:%lli]\n",
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381 store_inst->pcState(), storeTail, store_inst->seqNum);
| 320 store_inst->pcState(), storeQueue.tail(), store_inst->seqNum); 321 storeQueue.advance_tail();
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382
| 322
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383 store_inst->sqIdx = storeTail; 384 store_inst->lqIdx = loadTail;
| 323 store_inst->sqIdx = storeQueue.tail(); 324 store_inst->lqIdx = loadQueue.moduloAdd(loadQueue.tail(), 1); 325 store_inst->lqIt = loadQueue.end();
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385
| 326
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386 storeQueue[storeTail] = SQEntry(store_inst);
| 327 storeQueue.back().set(store_inst);
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387
| 328
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388 incrStIdx(storeTail); 389
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390 ++stores; 391} 392 393template <class Impl> 394typename Impl::DynInstPtr 395LSQUnit<Impl>::getMemDepViolator() 396{ 397 DynInstPtr temp = memDepViolator; 398 399 memDepViolator = NULL; 400 401 return temp; 402} 403 404template <class Impl> 405unsigned 406LSQUnit<Impl>::numFreeLoadEntries() 407{ 408 //LQ has an extra dummy entry to differentiate 409 //empty/full conditions. Subtract 1 from the free entries.
| 329 ++stores; 330} 331 332template <class Impl> 333typename Impl::DynInstPtr 334LSQUnit<Impl>::getMemDepViolator() 335{ 336 DynInstPtr temp = memDepViolator; 337 338 memDepViolator = NULL; 339 340 return temp; 341} 342 343template <class Impl> 344unsigned 345LSQUnit<Impl>::numFreeLoadEntries() 346{ 347 //LQ has an extra dummy entry to differentiate 348 //empty/full conditions. Subtract 1 from the free entries.
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410 DPRINTF(LSQUnit, "LQ size: %d, #loads occupied: %d\n", LQEntries, loads); 411 return LQEntries - loads - 1;
| 349 DPRINTF(LSQUnit, "LQ size: %d, #loads occupied: %d\n", 350 1 + loadQueue.capacity(), loads); 351 return loadQueue.capacity() - loads;
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412} 413 414template <class Impl> 415unsigned 416LSQUnit<Impl>::numFreeStoreEntries() 417{ 418 //SQ has an extra dummy entry to differentiate 419 //empty/full conditions. Subtract 1 from the free entries.
| 352} 353 354template <class Impl> 355unsigned 356LSQUnit<Impl>::numFreeStoreEntries() 357{ 358 //SQ has an extra dummy entry to differentiate 359 //empty/full conditions. Subtract 1 from the free entries.
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420 DPRINTF(LSQUnit, "SQ size: %d, #stores occupied: %d\n", SQEntries, stores); 421 return SQEntries - stores - 1;
| 360 DPRINTF(LSQUnit, "SQ size: %d, #stores occupied: %d\n", 361 1 + storeQueue.capacity(), stores); 362 return storeQueue.capacity() - stores;
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422 423 } 424 425template <class Impl> 426void 427LSQUnit<Impl>::checkSnoop(PacketPtr pkt) 428{ 429 // Should only ever get invalidations in here 430 assert(pkt->isInvalidate()); 431
| 363 364 } 365 366template <class Impl> 367void 368LSQUnit<Impl>::checkSnoop(PacketPtr pkt) 369{ 370 // Should only ever get invalidations in here 371 assert(pkt->isInvalidate()); 372
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432 int load_idx = loadHead;
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433 DPRINTF(LSQUnit, "Got snoop for address %#x\n", pkt->getAddr()); 434
| 373 DPRINTF(LSQUnit, "Got snoop for address %#x\n", pkt->getAddr()); 374
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435 // Only Invalidate packet calls checkSnoop 436 assert(pkt->isInvalidate());
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437 for (int x = 0; x < cpu->numContexts(); x++) { 438 ThreadContext *tc = cpu->getContext(x); 439 bool no_squash = cpu->thread[x]->noSquashFromTC; 440 cpu->thread[x]->noSquashFromTC = true; 441 TheISA::handleLockedSnoop(tc, pkt, cacheBlockMask); 442 cpu->thread[x]->noSquashFromTC = no_squash; 443 } 444
| 375 for (int x = 0; x < cpu->numContexts(); x++) { 376 ThreadContext *tc = cpu->getContext(x); 377 bool no_squash = cpu->thread[x]->noSquashFromTC; 378 cpu->thread[x]->noSquashFromTC = true; 379 TheISA::handleLockedSnoop(tc, pkt, cacheBlockMask); 380 cpu->thread[x]->noSquashFromTC = no_squash; 381 } 382
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445 Addr invalidate_addr = pkt->getAddr() & cacheBlockMask;
| 383 if (loadQueue.empty()) 384 return;
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446
| 385
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447 DynInstPtr ld_inst = loadQueue[load_idx]; 448 if (ld_inst) { 449 Addr load_addr_low = ld_inst->physEffAddrLow & cacheBlockMask; 450 Addr load_addr_high = ld_inst->physEffAddrHigh & cacheBlockMask;
| 386 auto iter = loadQueue.begin();
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451
| 387
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452 // Check that this snoop didn't just invalidate our lock flag 453 if (ld_inst->effAddrValid() && (load_addr_low == invalidate_addr 454 || load_addr_high == invalidate_addr) 455 && ld_inst->memReqFlags & Request::LLSC) 456 TheISA::handleLockedSnoopHit(ld_inst.get()); 457 }
| 388 Addr invalidate_addr = pkt->getAddr() & cacheBlockMask;
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458
| 389
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459 // If this is the only load in the LSQ we don't care 460 if (load_idx == loadTail) 461 return;
| 390 DynInstPtr ld_inst = iter->instruction(); 391 assert(ld_inst); 392 LSQRequest *req = iter->request();
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462
| 393
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463 incrLdIdx(load_idx);
| 394 // Check that this snoop didn't just invalidate our lock flag 395 if (ld_inst->effAddrValid() && 396 req->isCacheBlockHit(invalidate_addr, cacheBlockMask) 397 && ld_inst->memReqFlags & Request::LLSC) 398 TheISA::handleLockedSnoopHit(ld_inst.get());
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464 465 bool force_squash = false; 466
| 399 400 bool force_squash = false; 401
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467 while (load_idx != loadTail) { 468 DynInstPtr ld_inst = loadQueue[load_idx]; 469 470 if (!ld_inst->effAddrValid() || ld_inst->strictlyOrdered()) { 471 incrLdIdx(load_idx);
| 402 while (++iter != loadQueue.end()) { 403 ld_inst = iter->instruction(); 404 assert(ld_inst); 405 req = iter->request(); 406 if (!ld_inst->effAddrValid() || ld_inst->strictlyOrdered())
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472 continue;
| 407 continue;
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473 }
| |
474
| 408
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475 Addr load_addr_low = ld_inst->physEffAddrLow & cacheBlockMask; 476 Addr load_addr_high = ld_inst->physEffAddrHigh & cacheBlockMask;
| 409 DPRINTF(LSQUnit, "-- inst [sn:%lli] to pktAddr:%#x\n", 410 ld_inst->seqNum, invalidate_addr);
|
477
| 411
|
478 DPRINTF(LSQUnit, "-- inst [sn:%lli] load_addr: %#x to pktAddr:%#x\n", 479 ld_inst->seqNum, load_addr_low, invalidate_addr); 480 481 if ((load_addr_low == invalidate_addr 482 || load_addr_high == invalidate_addr) || force_squash) {
| 412 if (force_squash || 413 req->isCacheBlockHit(invalidate_addr, cacheBlockMask)) {
|
483 if (needsTSO) { 484 // If we have a TSO system, as all loads must be ordered with 485 // all other loads, this load as well as *all* subsequent loads 486 // need to be squashed to prevent possible load reordering. 487 force_squash = true; 488 } 489 if (ld_inst->possibleLoadViolation() || force_squash) { 490 DPRINTF(LSQUnit, "Conflicting load at addr %#x [sn:%lli]\n", 491 pkt->getAddr(), ld_inst->seqNum); 492 493 // Mark the load for re-execution 494 ld_inst->fault = std::make_shared<ReExec>(); 495 } else { 496 DPRINTF(LSQUnit, "HitExternal Snoop for addr %#x [sn:%lli]\n", 497 pkt->getAddr(), ld_inst->seqNum); 498 499 // Make sure that we don't lose a snoop hitting a LOCKED 500 // address since the LOCK* flags don't get updated until 501 // commit. 502 if (ld_inst->memReqFlags & Request::LLSC) 503 TheISA::handleLockedSnoopHit(ld_inst.get()); 504 505 // If a older load checks this and it's true 506 // then we might have missed the snoop 507 // in which case we need to invalidate to be sure 508 ld_inst->hitExternalSnoop(true); 509 } 510 }
| 414 if (needsTSO) { 415 // If we have a TSO system, as all loads must be ordered with 416 // all other loads, this load as well as *all* subsequent loads 417 // need to be squashed to prevent possible load reordering. 418 force_squash = true; 419 } 420 if (ld_inst->possibleLoadViolation() || force_squash) { 421 DPRINTF(LSQUnit, "Conflicting load at addr %#x [sn:%lli]\n", 422 pkt->getAddr(), ld_inst->seqNum); 423 424 // Mark the load for re-execution 425 ld_inst->fault = std::make_shared<ReExec>(); 426 } else { 427 DPRINTF(LSQUnit, "HitExternal Snoop for addr %#x [sn:%lli]\n", 428 pkt->getAddr(), ld_inst->seqNum); 429 430 // Make sure that we don't lose a snoop hitting a LOCKED 431 // address since the LOCK* flags don't get updated until 432 // commit. 433 if (ld_inst->memReqFlags & Request::LLSC) 434 TheISA::handleLockedSnoopHit(ld_inst.get()); 435 436 // If a older load checks this and it's true 437 // then we might have missed the snoop 438 // in which case we need to invalidate to be sure 439 ld_inst->hitExternalSnoop(true); 440 } 441 }
|
511 incrLdIdx(load_idx);
| |
512 } 513 return; 514} 515 516template <class Impl> 517Fault
| 442 } 443 return; 444} 445 446template <class Impl> 447Fault
|
518LSQUnit<Impl>::checkViolations(int load_idx, const DynInstPtr &inst)
| 448LSQUnit<Impl>::checkViolations(typename LoadQueue::iterator& loadIt, 449 const DynInstPtr& inst)
|
519{ 520 Addr inst_eff_addr1 = inst->effAddr >> depCheckShift; 521 Addr inst_eff_addr2 = (inst->effAddr + inst->effSize - 1) >> depCheckShift; 522 523 /** @todo in theory you only need to check an instruction that has executed 524 * however, there isn't a good way in the pipeline at the moment to check 525 * all instructions that will execute before the store writes back. Thus, 526 * like the implementation that came before it, we're overly conservative. 527 */
| 450{ 451 Addr inst_eff_addr1 = inst->effAddr >> depCheckShift; 452 Addr inst_eff_addr2 = (inst->effAddr + inst->effSize - 1) >> depCheckShift; 453 454 /** @todo in theory you only need to check an instruction that has executed 455 * however, there isn't a good way in the pipeline at the moment to check 456 * all instructions that will execute before the store writes back. Thus, 457 * like the implementation that came before it, we're overly conservative. 458 */
|
528 while (load_idx != loadTail) { 529 DynInstPtr ld_inst = loadQueue[load_idx];
| 459 while (loadIt != loadQueue.end()) { 460 DynInstPtr ld_inst = loadIt->instruction();
|
530 if (!ld_inst->effAddrValid() || ld_inst->strictlyOrdered()) {
| 461 if (!ld_inst->effAddrValid() || ld_inst->strictlyOrdered()) {
|
531 incrLdIdx(load_idx);
| 462 ++loadIt;
|
532 continue; 533 } 534 535 Addr ld_eff_addr1 = ld_inst->effAddr >> depCheckShift; 536 Addr ld_eff_addr2 = 537 (ld_inst->effAddr + ld_inst->effSize - 1) >> depCheckShift; 538 539 if (inst_eff_addr2 >= ld_eff_addr1 && inst_eff_addr1 <= ld_eff_addr2) { 540 if (inst->isLoad()) { 541 // If this load is to the same block as an external snoop 542 // invalidate that we've observed then the load needs to be 543 // squashed as it could have newer data 544 if (ld_inst->hitExternalSnoop()) { 545 if (!memDepViolator || 546 ld_inst->seqNum < memDepViolator->seqNum) { 547 DPRINTF(LSQUnit, "Detected fault with inst [sn:%lli] " 548 "and [sn:%lli] at address %#x\n", 549 inst->seqNum, ld_inst->seqNum, ld_eff_addr1); 550 memDepViolator = ld_inst; 551 552 ++lsqMemOrderViolation; 553 554 return std::make_shared<GenericISA::M5PanicFault>( 555 "Detected fault with inst [sn:%lli] and " 556 "[sn:%lli] at address %#x\n", 557 inst->seqNum, ld_inst->seqNum, ld_eff_addr1); 558 } 559 } 560 561 // Otherwise, mark the load has a possible load violation 562 // and if we see a snoop before it's commited, we need to squash 563 ld_inst->possibleLoadViolation(true); 564 DPRINTF(LSQUnit, "Found possible load violation at addr: %#x" 565 " between instructions [sn:%lli] and [sn:%lli]\n", 566 inst_eff_addr1, inst->seqNum, ld_inst->seqNum); 567 } else { 568 // A load/store incorrectly passed this store. 569 // Check if we already have a violator, or if it's newer 570 // squash and refetch. 571 if (memDepViolator && ld_inst->seqNum > memDepViolator->seqNum) 572 break; 573 574 DPRINTF(LSQUnit, "Detected fault with inst [sn:%lli] and " 575 "[sn:%lli] at address %#x\n", 576 inst->seqNum, ld_inst->seqNum, ld_eff_addr1); 577 memDepViolator = ld_inst; 578 579 ++lsqMemOrderViolation; 580 581 return std::make_shared<GenericISA::M5PanicFault>( 582 "Detected fault with " 583 "inst [sn:%lli] and [sn:%lli] at address %#x\n", 584 inst->seqNum, ld_inst->seqNum, ld_eff_addr1); 585 } 586 } 587
| 463 continue; 464 } 465 466 Addr ld_eff_addr1 = ld_inst->effAddr >> depCheckShift; 467 Addr ld_eff_addr2 = 468 (ld_inst->effAddr + ld_inst->effSize - 1) >> depCheckShift; 469 470 if (inst_eff_addr2 >= ld_eff_addr1 && inst_eff_addr1 <= ld_eff_addr2) { 471 if (inst->isLoad()) { 472 // If this load is to the same block as an external snoop 473 // invalidate that we've observed then the load needs to be 474 // squashed as it could have newer data 475 if (ld_inst->hitExternalSnoop()) { 476 if (!memDepViolator || 477 ld_inst->seqNum < memDepViolator->seqNum) { 478 DPRINTF(LSQUnit, "Detected fault with inst [sn:%lli] " 479 "and [sn:%lli] at address %#x\n", 480 inst->seqNum, ld_inst->seqNum, ld_eff_addr1); 481 memDepViolator = ld_inst; 482 483 ++lsqMemOrderViolation; 484 485 return std::make_shared<GenericISA::M5PanicFault>( 486 "Detected fault with inst [sn:%lli] and " 487 "[sn:%lli] at address %#x\n", 488 inst->seqNum, ld_inst->seqNum, ld_eff_addr1); 489 } 490 } 491 492 // Otherwise, mark the load has a possible load violation 493 // and if we see a snoop before it's commited, we need to squash 494 ld_inst->possibleLoadViolation(true); 495 DPRINTF(LSQUnit, "Found possible load violation at addr: %#x" 496 " between instructions [sn:%lli] and [sn:%lli]\n", 497 inst_eff_addr1, inst->seqNum, ld_inst->seqNum); 498 } else { 499 // A load/store incorrectly passed this store. 500 // Check if we already have a violator, or if it's newer 501 // squash and refetch. 502 if (memDepViolator && ld_inst->seqNum > memDepViolator->seqNum) 503 break; 504 505 DPRINTF(LSQUnit, "Detected fault with inst [sn:%lli] and " 506 "[sn:%lli] at address %#x\n", 507 inst->seqNum, ld_inst->seqNum, ld_eff_addr1); 508 memDepViolator = ld_inst; 509 510 ++lsqMemOrderViolation; 511 512 return std::make_shared<GenericISA::M5PanicFault>( 513 "Detected fault with " 514 "inst [sn:%lli] and [sn:%lli] at address %#x\n", 515 inst->seqNum, ld_inst->seqNum, ld_eff_addr1); 516 } 517 } 518
|
588 incrLdIdx(load_idx);
| 519 ++loadIt;
|
589 } 590 return NoFault; 591} 592 593 594 595 596template <class Impl> 597Fault 598LSQUnit<Impl>::executeLoad(const DynInstPtr &inst) 599{ 600 using namespace TheISA; 601 // Execute a specific load. 602 Fault load_fault = NoFault; 603 604 DPRINTF(LSQUnit, "Executing load PC %s, [sn:%lli]\n", 605 inst->pcState(), inst->seqNum); 606 607 assert(!inst->isSquashed()); 608 609 load_fault = inst->initiateAcc(); 610
| 520 } 521 return NoFault; 522} 523 524 525 526 527template <class Impl> 528Fault 529LSQUnit<Impl>::executeLoad(const DynInstPtr &inst) 530{ 531 using namespace TheISA; 532 // Execute a specific load. 533 Fault load_fault = NoFault; 534 535 DPRINTF(LSQUnit, "Executing load PC %s, [sn:%lli]\n", 536 inst->pcState(), inst->seqNum); 537 538 assert(!inst->isSquashed()); 539 540 load_fault = inst->initiateAcc(); 541
|
611 if (inst->isTranslationDelayed() && 612 load_fault == NoFault)
| 542 if (inst->isTranslationDelayed() && load_fault == NoFault)
|
613 return load_fault; 614 615 // If the instruction faulted or predicated false, then we need to send it 616 // along to commit without the instruction completing. 617 if (load_fault != NoFault || !inst->readPredicate()) { 618 // Send this instruction to commit, also make sure iew stage 619 // realizes there is activity. Mark it as executed unless it 620 // is a strictly ordered load that needs to hit the head of 621 // commit. 622 if (!inst->readPredicate()) 623 inst->forwardOldRegs(); 624 DPRINTF(LSQUnit, "Load [sn:%lli] not executed from %s\n", 625 inst->seqNum, 626 (load_fault != NoFault ? "fault" : "predication")); 627 if (!(inst->hasRequest() && inst->strictlyOrdered()) || 628 inst->isAtCommit()) { 629 inst->setExecuted(); 630 } 631 iewStage->instToCommit(inst); 632 iewStage->activityThisCycle(); 633 } else {
| 543 return load_fault; 544 545 // If the instruction faulted or predicated false, then we need to send it 546 // along to commit without the instruction completing. 547 if (load_fault != NoFault || !inst->readPredicate()) { 548 // Send this instruction to commit, also make sure iew stage 549 // realizes there is activity. Mark it as executed unless it 550 // is a strictly ordered load that needs to hit the head of 551 // commit. 552 if (!inst->readPredicate()) 553 inst->forwardOldRegs(); 554 DPRINTF(LSQUnit, "Load [sn:%lli] not executed from %s\n", 555 inst->seqNum, 556 (load_fault != NoFault ? "fault" : "predication")); 557 if (!(inst->hasRequest() && inst->strictlyOrdered()) || 558 inst->isAtCommit()) { 559 inst->setExecuted(); 560 } 561 iewStage->instToCommit(inst); 562 iewStage->activityThisCycle(); 563 } else {
|
634 assert(inst->effAddrValid()); 635 int load_idx = inst->lqIdx; 636 incrLdIdx(load_idx);
| 564 if (inst->effAddrValid()) { 565 auto it = inst->lqIt; 566 ++it;
|
637
| 567
|
638 if (checkLoads) 639 return checkViolations(load_idx, inst);
| 568 if (checkLoads) 569 return checkViolations(it, inst); 570 }
|
640 } 641 642 return load_fault; 643} 644 645template <class Impl> 646Fault 647LSQUnit<Impl>::executeStore(const DynInstPtr &store_inst) 648{ 649 using namespace TheISA; 650 // Make sure that a store exists. 651 assert(stores != 0); 652 653 int store_idx = store_inst->sqIdx; 654 655 DPRINTF(LSQUnit, "Executing store PC %s [sn:%lli]\n", 656 store_inst->pcState(), store_inst->seqNum); 657 658 assert(!store_inst->isSquashed()); 659 660 // Check the recently completed loads to see if any match this store's 661 // address. If so, then we have a memory ordering violation.
| 571 } 572 573 return load_fault; 574} 575 576template <class Impl> 577Fault 578LSQUnit<Impl>::executeStore(const DynInstPtr &store_inst) 579{ 580 using namespace TheISA; 581 // Make sure that a store exists. 582 assert(stores != 0); 583 584 int store_idx = store_inst->sqIdx; 585 586 DPRINTF(LSQUnit, "Executing store PC %s [sn:%lli]\n", 587 store_inst->pcState(), store_inst->seqNum); 588 589 assert(!store_inst->isSquashed()); 590 591 // Check the recently completed loads to see if any match this store's 592 // address. If so, then we have a memory ordering violation.
|
662 int load_idx = store_inst->lqIdx;
| 593 typename LoadQueue::iterator loadIt = store_inst->lqIt;
|
663 664 Fault store_fault = store_inst->initiateAcc(); 665 666 if (store_inst->isTranslationDelayed() && 667 store_fault == NoFault) 668 return store_fault; 669 670 if (!store_inst->readPredicate()) { 671 DPRINTF(LSQUnit, "Store [sn:%lli] not executed from predication\n", 672 store_inst->seqNum); 673 store_inst->forwardOldRegs(); 674 return store_fault; 675 } 676
| 594 595 Fault store_fault = store_inst->initiateAcc(); 596 597 if (store_inst->isTranslationDelayed() && 598 store_fault == NoFault) 599 return store_fault; 600 601 if (!store_inst->readPredicate()) { 602 DPRINTF(LSQUnit, "Store [sn:%lli] not executed from predication\n", 603 store_inst->seqNum); 604 store_inst->forwardOldRegs(); 605 return store_fault; 606 } 607
|
677 if (storeQueue[store_idx].size == 0) {
| 608 if (storeQueue[store_idx].size() == 0) {
|
678 DPRINTF(LSQUnit,"Fault on Store PC %s, [sn:%lli], Size = 0\n", 679 store_inst->pcState(), store_inst->seqNum); 680 681 return store_fault; 682 } 683 684 assert(store_fault == NoFault); 685 686 if (store_inst->isStoreConditional()) { 687 // Store conditionals need to set themselves as able to 688 // writeback if we haven't had a fault by here.
| 609 DPRINTF(LSQUnit,"Fault on Store PC %s, [sn:%lli], Size = 0\n", 610 store_inst->pcState(), store_inst->seqNum); 611 612 return store_fault; 613 } 614 615 assert(store_fault == NoFault); 616 617 if (store_inst->isStoreConditional()) { 618 // Store conditionals need to set themselves as able to 619 // writeback if we haven't had a fault by here.
|
689 storeQueue[store_idx].canWB = true;
| 620 storeQueue[store_idx].canWB() = true;
|
690 691 ++storesToWB; 692 } 693
| 621 622 ++storesToWB; 623 } 624
|
694 return checkViolations(load_idx, store_inst);
| 625 return checkViolations(loadIt, store_inst);
|
695 696} 697 698template <class Impl> 699void 700LSQUnit<Impl>::commitLoad() 701{
| 626 627} 628 629template <class Impl> 630void 631LSQUnit<Impl>::commitLoad() 632{
|
702 assert(loadQueue[loadHead]);
| 633 assert(loadQueue.front().valid());
|
703 704 DPRINTF(LSQUnit, "Committing head load instruction, PC %s\n",
| 634 635 DPRINTF(LSQUnit, "Committing head load instruction, PC %s\n",
|
705 loadQueue[loadHead]->pcState());
| 636 loadQueue.front().instruction()->pcState());
|
706
| 637
|
707 loadQueue[loadHead] = NULL;
| 638 loadQueue.front().clear(); 639 loadQueue.pop_front();
|
708
| 640
|
709 incrLdIdx(loadHead); 710
| |
711 --loads; 712} 713 714template <class Impl> 715void 716LSQUnit<Impl>::commitLoads(InstSeqNum &youngest_inst) 717{
| 641 --loads; 642} 643 644template <class Impl> 645void 646LSQUnit<Impl>::commitLoads(InstSeqNum &youngest_inst) 647{
|
718 assert(loads == 0 || loadQueue[loadHead]);
| 648 assert(loads == 0 || loadQueue.front().valid());
|
719
| 649
|
720 while (loads != 0 && loadQueue[loadHead]->seqNum <= youngest_inst) {
| 650 while (loads != 0 && loadQueue.front().instruction()->seqNum 651 <= youngest_inst) {
|
721 commitLoad(); 722 } 723} 724 725template <class Impl> 726void 727LSQUnit<Impl>::commitStores(InstSeqNum &youngest_inst) 728{
| 652 commitLoad(); 653 } 654} 655 656template <class Impl> 657void 658LSQUnit<Impl>::commitStores(InstSeqNum &youngest_inst) 659{
|
729 assert(stores == 0 || storeQueue[storeHead].inst);
| 660 assert(stores == 0 || storeQueue.front().valid());
|
730
| 661
|
731 int store_idx = storeHead; 732 733 while (store_idx != storeTail) { 734 assert(storeQueue[store_idx].inst);
| 662 /* Forward iterate the store queue (age order). */ 663 for (auto& x : storeQueue) { 664 assert(x.valid());
|
735 // Mark any stores that are now committed and have not yet 736 // been marked as able to write back.
| 665 // Mark any stores that are now committed and have not yet 666 // been marked as able to write back.
|
737 if (!storeQueue[store_idx].canWB) { 738 if (storeQueue[store_idx].inst->seqNum > youngest_inst) {
| 667 if (!x.canWB()) { 668 if (x.instruction()->seqNum > youngest_inst) {
|
739 break; 740 } 741 DPRINTF(LSQUnit, "Marking store as able to write back, PC " 742 "%s [sn:%lli]\n",
| 669 break; 670 } 671 DPRINTF(LSQUnit, "Marking store as able to write back, PC " 672 "%s [sn:%lli]\n",
|
743 storeQueue[store_idx].inst->pcState(), 744 storeQueue[store_idx].inst->seqNum);
| 673 x.instruction()->pcState(), 674 x.instruction()->seqNum);
|
745
| 675
|
746 storeQueue[store_idx].canWB = true;
| 676 x.canWB() = true;
|
747 748 ++storesToWB; 749 }
| 677 678 ++storesToWB; 679 }
|
750 751 incrStIdx(store_idx);
| |
752 } 753} 754 755template <class Impl> 756void
| 680 } 681} 682 683template <class Impl> 684void
|
757LSQUnit<Impl>::writebackPendingStore()
| 685LSQUnit<Impl>::writebackBlockedStore()
|
758{
| 686{
|
759 if (hasPendingPkt) { 760 assert(pendingPkt != NULL); 761 762 // If the cache is blocked, this will store the packet for retry. 763 if (sendStore(pendingPkt)) { 764 storePostSend(pendingPkt); 765 } 766 pendingPkt = NULL; 767 hasPendingPkt = false;
| 687 assert(isStoreBlocked); 688 storeWBIt->request()->sendPacketToCache(); 689 if (storeWBIt->request()->isSent()){ 690 storePostSend();
|
768 } 769} 770 771template <class Impl> 772void 773LSQUnit<Impl>::writebackStores() 774{
| 691 } 692} 693 694template <class Impl> 695void 696LSQUnit<Impl>::writebackStores() 697{
|
775 // First writeback the second packet from any split store that didn't 776 // complete last cycle because there weren't enough cache ports available. 777 if (TheISA::HasUnalignedMemAcc) { 778 writebackPendingStore();
| 698 if (isStoreBlocked) { 699 DPRINTF(LSQUnit, "Writing back blocked store\n"); 700 writebackBlockedStore();
|
779 } 780 781 while (storesToWB > 0 &&
| 701 } 702 703 while (storesToWB > 0 &&
|
782 storeWBIdx != storeTail && 783 storeQueue[storeWBIdx].inst && 784 storeQueue[storeWBIdx].canWB &&
| 704 storeWBIt.dereferenceable() && 705 storeWBIt->valid() && 706 storeWBIt->canWB() &&
|
785 ((!needsTSO) || (!storeInFlight)) &&
| 707 ((!needsTSO) || (!storeInFlight)) &&
|
786 usedStorePorts < cacheStorePorts) {
| 708 lsq->storePortAvailable()) {
|
787 788 if (isStoreBlocked) { 789 DPRINTF(LSQUnit, "Unable to write back any more stores, cache" 790 " is blocked!\n"); 791 break; 792 } 793 794 // Store didn't write any data so no need to write it back to 795 // memory.
| 709 710 if (isStoreBlocked) { 711 DPRINTF(LSQUnit, "Unable to write back any more stores, cache" 712 " is blocked!\n"); 713 break; 714 } 715 716 // Store didn't write any data so no need to write it back to 717 // memory.
|
796 if (storeQueue[storeWBIdx].size == 0) { 797 completeStore(storeWBIdx); 798 799 incrStIdx(storeWBIdx); 800
| 718 if (storeWBIt->size() == 0) { 719 /* It is important that the preincrement happens at (or before) 720 * the call, as the the code of completeStore checks 721 * storeWBIt. */ 722 completeStore(storeWBIt++);
|
801 continue; 802 } 803
| 723 continue; 724 } 725
|
804 ++usedStorePorts; 805 806 if (storeQueue[storeWBIdx].inst->isDataPrefetch()) { 807 incrStIdx(storeWBIdx); 808
| 726 if (storeWBIt->instruction()->isDataPrefetch()) { 727 storeWBIt++;
|
809 continue; 810 } 811
| 728 continue; 729 } 730
|
812 assert(storeQueue[storeWBIdx].req); 813 assert(!storeQueue[storeWBIdx].committed);
| 731 assert(storeWBIt->hasRequest()); 732 assert(!storeWBIt->committed());
|
814
| 733
|
815 if (TheISA::HasUnalignedMemAcc && storeQueue[storeWBIdx].isSplit) { 816 assert(storeQueue[storeWBIdx].sreqLow); 817 assert(storeQueue[storeWBIdx].sreqHigh); 818 }
| 734 DynInstPtr inst = storeWBIt->instruction(); 735 LSQRequest* req = storeWBIt->request(); 736 storeWBIt->committed() = true;
|
819
| 737
|
820 DynInstPtr inst = storeQueue[storeWBIdx].inst; 821 822 RequestPtr &req = storeQueue[storeWBIdx].req; 823 const RequestPtr &sreqLow = storeQueue[storeWBIdx].sreqLow; 824 const RequestPtr &sreqHigh = storeQueue[storeWBIdx].sreqHigh; 825 826 storeQueue[storeWBIdx].committed = true; 827
| |
828 assert(!inst->memData);
| 738 assert(!inst->memData);
|
829 inst->memData = new uint8_t[req->getSize()];
| 739 inst->memData = new uint8_t[req->_size];
|
830
| 740
|
831 if (storeQueue[storeWBIdx].isAllZeros) 832 memset(inst->memData, 0, req->getSize());
| 741 if (storeWBIt->isAllZeros()) 742 memset(inst->memData, 0, req->_size);
|
833 else
| 743 else
|
834 memcpy(inst->memData, storeQueue[storeWBIdx].data, req->getSize());
| 744 memcpy(inst->memData, storeWBIt->data(), req->_size);
|
835
| 745
|
836 PacketPtr data_pkt; 837 PacketPtr snd_data_pkt = NULL;
| |
838
| 746
|
839 LSQSenderState *state = new LSQSenderState; 840 state->isLoad = false; 841 state->idx = storeWBIdx; 842 state->inst = inst;
| 747 if (req->senderState() == nullptr) { 748 SQSenderState *state = new SQSenderState(storeWBIt); 749 state->isLoad = false; 750 state->needWB = false; 751 state->inst = inst;
|
843
| 752
|
844 if (!TheISA::HasUnalignedMemAcc || !storeQueue[storeWBIdx].isSplit) { 845 846 // Build a single data packet if the store isn't split. 847 data_pkt = Packet::createWrite(req); 848 data_pkt->dataStatic(inst->memData); 849 data_pkt->senderState = state; 850 } else { 851 // Create two packets if the store is split in two. 852 data_pkt = Packet::createWrite(sreqLow); 853 snd_data_pkt = Packet::createWrite(sreqHigh); 854 855 data_pkt->dataStatic(inst->memData); 856 snd_data_pkt->dataStatic(inst->memData + sreqLow->getSize()); 857 858 data_pkt->senderState = state; 859 snd_data_pkt->senderState = state; 860 861 state->isSplit = true; 862 state->outstanding = 2; 863 864 // Can delete the main request now. 865 req = sreqLow;
| 753 req->senderState(state); 754 if (inst->isStoreConditional()) { 755 /* Only store conditionals need a writeback. */ 756 state->needWB = true; 757 }
|
866 }
| 758 }
|
| 759 req->buildPackets();
|
867 868 DPRINTF(LSQUnit, "D-Cache: Writing back store idx:%i PC:%s " 869 "to Addr:%#x, data:%#x [sn:%lli]\n",
| 760 761 DPRINTF(LSQUnit, "D-Cache: Writing back store idx:%i PC:%s " 762 "to Addr:%#x, data:%#x [sn:%lli]\n",
|
870 storeWBIdx, inst->pcState(), 871 req->getPaddr(), (int)*(inst->memData),
| 763 storeWBIt.idx(), inst->pcState(), 764 req->request()->getPaddr(), (int)*(inst->memData),
|
872 inst->seqNum); 873 874 // @todo: Remove this SC hack once the memory system handles it. 875 if (inst->isStoreConditional()) {
| 765 inst->seqNum); 766 767 // @todo: Remove this SC hack once the memory system handles it. 768 if (inst->isStoreConditional()) {
|
876 assert(!storeQueue[storeWBIdx].isSplit);
| |
877 // Disable recording the result temporarily. Writing to 878 // misc regs normally updates the result, but this is not 879 // the desired behavior when handling store conditionals. 880 inst->recordResult(false);
| 769 // Disable recording the result temporarily. Writing to 770 // misc regs normally updates the result, but this is not 771 // the desired behavior when handling store conditionals. 772 inst->recordResult(false);
|
881 bool success = TheISA::handleLockedWrite(inst.get(), req, cacheBlockMask);
| 773 bool success = TheISA::handleLockedWrite(inst.get(), 774 req->request(), cacheBlockMask);
|
882 inst->recordResult(true);
| 775 inst->recordResult(true);
|
| 776 req->packetSent();
|
883 884 if (!success) {
| 777 778 if (!success) {
|
| 779 req->complete();
|
885 // Instantly complete this store. 886 DPRINTF(LSQUnit, "Store conditional [sn:%lli] failed. " 887 "Instantly completing it.\n", 888 inst->seqNum);
| 780 // Instantly complete this store. 781 DPRINTF(LSQUnit, "Store conditional [sn:%lli] failed. " 782 "Instantly completing it.\n", 783 inst->seqNum);
|
889 WritebackEvent *wb = new WritebackEvent(inst, data_pkt, this);
| 784 PacketPtr new_pkt = new Packet(*req->packet()); 785 WritebackEvent *wb = new WritebackEvent(inst, 786 new_pkt, this);
|
890 cpu->schedule(wb, curTick() + 1);
| 787 cpu->schedule(wb, curTick() + 1);
|
891 completeStore(storeWBIdx); 892 incrStIdx(storeWBIdx);
| 788 completeStore(storeWBIt); 789 if (!storeQueue.empty()) 790 storeWBIt++; 791 else 792 storeWBIt = storeQueue.end();
|
893 continue; 894 }
| 793 continue; 794 }
|
895 } else { 896 // Non-store conditionals do not need a writeback. 897 state->noWB = true;
| |
898 } 899
| 795 } 796
|
900 bool split = 901 TheISA::HasUnalignedMemAcc && storeQueue[storeWBIdx].isSplit; 902 903 ThreadContext *thread = cpu->tcBase(lsqID); 904 905 if (req->isMmappedIpr()) {
| 797 if (req->request()->isMmappedIpr()) {
|
906 assert(!inst->isStoreConditional());
| 798 assert(!inst->isStoreConditional());
|
907 TheISA::handleIprWrite(thread, data_pkt); 908 delete data_pkt; 909 if (split) { 910 assert(snd_data_pkt->req->isMmappedIpr()); 911 TheISA::handleIprWrite(thread, snd_data_pkt); 912 delete snd_data_pkt; 913 } 914 delete state; 915 completeStore(storeWBIdx); 916 incrStIdx(storeWBIdx); 917 } else if (!sendStore(data_pkt)) { 918 DPRINTF(IEW, "D-Cache became blocked when writing [sn:%lli], will" 919 "retry later\n", 920 inst->seqNum);
| 799 ThreadContext *thread = cpu->tcBase(lsqID); 800 PacketPtr main_pkt = new Packet(req->mainRequest(), 801 MemCmd::WriteReq); 802 main_pkt->dataStatic(inst->memData); 803 req->handleIprWrite(thread, main_pkt); 804 delete main_pkt; 805 completeStore(storeWBIt); 806 storeWBIt++; 807 continue; 808 } 809 /* Send to cache */ 810 req->sendPacketToCache();
|
921
| 811
|
922 // Need to store the second packet, if split. 923 if (split) { 924 state->pktToSend = true; 925 state->pendingPacket = snd_data_pkt; 926 }
| 812 /* If successful, do the post send */ 813 if (req->isSent()) { 814 storePostSend();
|
927 } else {
| 815 } else {
|
928 929 // If split, try to send the second packet too 930 if (split) { 931 assert(snd_data_pkt); 932 933 // Ensure there are enough ports to use. 934 if (usedStorePorts < cacheStorePorts) { 935 ++usedStorePorts; 936 if (sendStore(snd_data_pkt)) { 937 storePostSend(snd_data_pkt); 938 } else { 939 DPRINTF(IEW, "D-Cache became blocked when writing" 940 " [sn:%lli] second packet, will retry later\n", 941 inst->seqNum); 942 } 943 } else { 944 945 // Store the packet for when there's free ports. 946 assert(pendingPkt == NULL); 947 pendingPkt = snd_data_pkt; 948 hasPendingPkt = true; 949 } 950 } else { 951 952 // Not a split store. 953 storePostSend(data_pkt); 954 }
| 816 DPRINTF(LSQUnit, "D-Cache became blocked when writing [sn:%lli], " 817 "will retry later\n", 818 inst->seqNum);
|
955 } 956 }
| 819 } 820 }
|
957 958 // Not sure this should set it to 0. 959 usedStorePorts = 0; 960
| |
961 assert(stores >= 0 && storesToWB >= 0); 962} 963
| 821 assert(stores >= 0 && storesToWB >= 0); 822} 823
|
964/*template <class Impl> 965void 966LSQUnit<Impl>::removeMSHR(InstSeqNum seqNum) 967{ 968 list<InstSeqNum>::iterator mshr_it = find(mshrSeqNums.begin(), 969 mshrSeqNums.end(), 970 seqNum); 971 972 if (mshr_it != mshrSeqNums.end()) { 973 mshrSeqNums.erase(mshr_it); 974 DPRINTF(LSQUnit, "Removing MSHR. count = %i\n",mshrSeqNums.size()); 975 } 976}*/ 977
| |
978template <class Impl> 979void 980LSQUnit<Impl>::squash(const InstSeqNum &squashed_num) 981{ 982 DPRINTF(LSQUnit, "Squashing until [sn:%lli]!" 983 "(Loads:%i Stores:%i)\n", squashed_num, loads, stores); 984
| 824template <class Impl> 825void 826LSQUnit<Impl>::squash(const InstSeqNum &squashed_num) 827{ 828 DPRINTF(LSQUnit, "Squashing until [sn:%lli]!" 829 "(Loads:%i Stores:%i)\n", squashed_num, loads, stores); 830
|
985 int load_idx = loadTail; 986 decrLdIdx(load_idx); 987 988 while (loads != 0 && loadQueue[load_idx]->seqNum > squashed_num) {
| 831 while (loads != 0 && 832 loadQueue.back().instruction()->seqNum > squashed_num) {
|
989 DPRINTF(LSQUnit,"Load Instruction PC %s squashed, " 990 "[sn:%lli]\n",
| 833 DPRINTF(LSQUnit,"Load Instruction PC %s squashed, " 834 "[sn:%lli]\n",
|
991 loadQueue[load_idx]->pcState(), 992 loadQueue[load_idx]->seqNum);
| 835 loadQueue.back().instruction()->pcState(), 836 loadQueue.back().instruction()->seqNum);
|
993
| 837
|
994 if (isStalled() && load_idx == stallingLoadIdx) {
| 838 if (isStalled() && loadQueue.tail() == stallingLoadIdx) {
|
995 stalled = false; 996 stallingStoreIsn = 0; 997 stallingLoadIdx = 0; 998 } 999 1000 // Clear the smart pointer to make sure it is decremented.
| 839 stalled = false; 840 stallingStoreIsn = 0; 841 stallingLoadIdx = 0; 842 } 843 844 // Clear the smart pointer to make sure it is decremented.
|
1001 loadQueue[load_idx]->setSquashed(); 1002 loadQueue[load_idx] = NULL;
| 845 loadQueue.back().instruction()->setSquashed(); 846 loadQueue.back().clear(); 847
|
1003 --loads; 1004
| 848 --loads; 849
|
1005 // Inefficient! 1006 loadTail = load_idx; 1007 1008 decrLdIdx(load_idx);
| 850 loadQueue.pop_back();
|
1009 ++lsqSquashedLoads; 1010 } 1011 1012 if (memDepViolator && squashed_num < memDepViolator->seqNum) { 1013 memDepViolator = NULL; 1014 } 1015
| 851 ++lsqSquashedLoads; 852 } 853 854 if (memDepViolator && squashed_num < memDepViolator->seqNum) { 855 memDepViolator = NULL; 856 } 857
|
1016 int store_idx = storeTail; 1017 decrStIdx(store_idx); 1018
| |
1019 while (stores != 0 &&
| 858 while (stores != 0 &&
|
1020 storeQueue[store_idx].inst->seqNum > squashed_num) {
| 859 storeQueue.back().instruction()->seqNum > squashed_num) {
|
1021 // Instructions marked as can WB are already committed.
| 860 // Instructions marked as can WB are already committed.
|
1022 if (storeQueue[store_idx].canWB) {
| 861 if (storeQueue.back().canWB()) {
|
1023 break; 1024 } 1025 1026 DPRINTF(LSQUnit,"Store Instruction PC %s squashed, " 1027 "idx:%i [sn:%lli]\n",
| 862 break; 863 } 864 865 DPRINTF(LSQUnit,"Store Instruction PC %s squashed, " 866 "idx:%i [sn:%lli]\n",
|
1028 storeQueue[store_idx].inst->pcState(), 1029 store_idx, storeQueue[store_idx].inst->seqNum);
| 867 storeQueue.back().instruction()->pcState(), 868 storeQueue.tail(), storeQueue.back().instruction()->seqNum);
|
1030 1031 // I don't think this can happen. It should have been cleared 1032 // by the stalling load. 1033 if (isStalled() &&
| 869 870 // I don't think this can happen. It should have been cleared 871 // by the stalling load. 872 if (isStalled() &&
|
1034 storeQueue[store_idx].inst->seqNum == stallingStoreIsn) {
| 873 storeQueue.back().instruction()->seqNum == stallingStoreIsn) {
|
1035 panic("Is stalled should have been cleared by stalling load!\n"); 1036 stalled = false; 1037 stallingStoreIsn = 0; 1038 } 1039 1040 // Clear the smart pointer to make sure it is decremented.
| 874 panic("Is stalled should have been cleared by stalling load!\n"); 875 stalled = false; 876 stallingStoreIsn = 0; 877 } 878 879 // Clear the smart pointer to make sure it is decremented.
|
1041 storeQueue[store_idx].inst->setSquashed(); 1042 storeQueue[store_idx].inst = NULL; 1043 storeQueue[store_idx].canWB = 0;
| 880 storeQueue.back().instruction()->setSquashed();
|
1044 1045 // Must delete request now that it wasn't handed off to 1046 // memory. This is quite ugly. @todo: Figure out the proper 1047 // place to really handle request deletes.
| 881 882 // Must delete request now that it wasn't handed off to 883 // memory. This is quite ugly. @todo: Figure out the proper 884 // place to really handle request deletes.
|
1048 storeQueue[store_idx].req.reset(); 1049 if (TheISA::HasUnalignedMemAcc && storeQueue[store_idx].isSplit) { 1050 storeQueue[store_idx].sreqLow.reset(); 1051 storeQueue[store_idx].sreqHigh.reset(); 1052 } 1053
| 885 storeQueue.back().clear();
|
1054 --stores; 1055
| 886 --stores; 887
|
1056 // Inefficient! 1057 storeTail = store_idx; 1058 1059 decrStIdx(store_idx);
| 888 storeQueue.pop_back();
|
1060 ++lsqSquashedStores; 1061 } 1062} 1063 1064template <class Impl> 1065void
| 889 ++lsqSquashedStores; 890 } 891} 892 893template <class Impl> 894void
|
1066LSQUnit<Impl>::storePostSend(PacketPtr pkt)
| 895LSQUnit::storePostSend()
|
1067{ 1068 if (isStalled() &&
| 896{ 897 if (isStalled() &&
|
1069 storeQueue[storeWBIdx].inst->seqNum == stallingStoreIsn) {
| 898 storeWBIt->instruction()->seqNum == stallingStoreIsn) {
|
1070 DPRINTF(LSQUnit, "Unstalling, stalling store [sn:%lli] " 1071 "load idx:%i\n", 1072 stallingStoreIsn, stallingLoadIdx); 1073 stalled = false; 1074 stallingStoreIsn = 0;
| 899 DPRINTF(LSQUnit, "Unstalling, stalling store [sn:%lli] " 900 "load idx:%i\n", 901 stallingStoreIsn, stallingLoadIdx); 902 stalled = false; 903 stallingStoreIsn = 0;
|
1075 iewStage->replayMemInst(loadQueue[stallingLoadIdx]);
| 904 iewStage->replayMemInst(loadQueue[stallingLoadIdx].instruction());
|
1076 } 1077
| 905 } 906
|
1078 if (!storeQueue[storeWBIdx].inst->isStoreConditional()) {
| 907 if (!storeWBIt->instruction()->isStoreConditional()) {
|
1079 // The store is basically completed at this time. This 1080 // only works so long as the checker doesn't try to 1081 // verify the value in memory for stores.
| 908 // The store is basically completed at this time. This 909 // only works so long as the checker doesn't try to 910 // verify the value in memory for stores.
|
1082 storeQueue[storeWBIdx].inst->setCompleted();
| 911 storeWBIt->instruction()->setCompleted();
|
1083 1084 if (cpu->checker) {
| 912 913 if (cpu->checker) {
|
1085 cpu->checker->verify(storeQueue[storeWBIdx].inst);
| 914 cpu->checker->verify(storeWBIt->instruction());
|
1086 } 1087 } 1088 1089 if (needsTSO) { 1090 storeInFlight = true; 1091 } 1092
| 915 } 916 } 917 918 if (needsTSO) { 919 storeInFlight = true; 920 } 921
|
1093 incrStIdx(storeWBIdx);
| 922 storeWBIt++;
|
1094} 1095 1096template <class Impl> 1097void 1098LSQUnit<Impl>::writeback(const DynInstPtr &inst, PacketPtr pkt) 1099{ 1100 iewStage->wakeCPU(); 1101 1102 // Squashed instructions do not need to complete their access. 1103 if (inst->isSquashed()) { 1104 assert(!inst->isStore()); 1105 ++lsqIgnoredResponses; 1106 return; 1107 } 1108 1109 if (!inst->isExecuted()) { 1110 inst->setExecuted(); 1111 1112 if (inst->fault == NoFault) { 1113 // Complete access to copy data to proper place. 1114 inst->completeAcc(pkt); 1115 } else { 1116 // If the instruction has an outstanding fault, we cannot complete 1117 // the access as this discards the current fault. 1118 1119 // If we have an outstanding fault, the fault should only be of 1120 // type ReExec. 1121 assert(dynamic_cast<ReExec*>(inst->fault.get()) != nullptr); 1122 1123 DPRINTF(LSQUnit, "Not completing instruction [sn:%lli] access " 1124 "due to pending fault.\n", inst->seqNum); 1125 } 1126 } 1127 1128 // Need to insert instruction into queue to commit 1129 iewStage->instToCommit(inst); 1130 1131 iewStage->activityThisCycle(); 1132 1133 // see if this load changed the PC 1134 iewStage->checkMisprediction(inst); 1135} 1136 1137template <class Impl> 1138void
| 923} 924 925template <class Impl> 926void 927LSQUnit<Impl>::writeback(const DynInstPtr &inst, PacketPtr pkt) 928{ 929 iewStage->wakeCPU(); 930 931 // Squashed instructions do not need to complete their access. 932 if (inst->isSquashed()) { 933 assert(!inst->isStore()); 934 ++lsqIgnoredResponses; 935 return; 936 } 937 938 if (!inst->isExecuted()) { 939 inst->setExecuted(); 940 941 if (inst->fault == NoFault) { 942 // Complete access to copy data to proper place. 943 inst->completeAcc(pkt); 944 } else { 945 // If the instruction has an outstanding fault, we cannot complete 946 // the access as this discards the current fault. 947 948 // If we have an outstanding fault, the fault should only be of 949 // type ReExec. 950 assert(dynamic_cast<ReExec*>(inst->fault.get()) != nullptr); 951 952 DPRINTF(LSQUnit, "Not completing instruction [sn:%lli] access " 953 "due to pending fault.\n", inst->seqNum); 954 } 955 } 956 957 // Need to insert instruction into queue to commit 958 iewStage->instToCommit(inst); 959 960 iewStage->activityThisCycle(); 961 962 // see if this load changed the PC 963 iewStage->checkMisprediction(inst); 964} 965 966template <class Impl> 967void
|
1139LSQUnit<Impl>::completeStore(int store_idx)
| 968LSQUnit<Impl>::completeStore(typename StoreQueue::iterator store_idx)
|
1140{
| 969{
|
1141 assert(storeQueue[store_idx].inst); 1142 storeQueue[store_idx].completed = true;
| 970 assert(store_idx->valid()); 971 store_idx->completed() = true;
|
1143 --storesToWB; 1144 // A bit conservative because a store completion may not free up entries, 1145 // but hopefully avoids two store completions in one cycle from making 1146 // the CPU tick twice. 1147 cpu->wakeCPU(); 1148 cpu->activityThisCycle(); 1149
| 972 --storesToWB; 973 // A bit conservative because a store completion may not free up entries, 974 // but hopefully avoids two store completions in one cycle from making 975 // the CPU tick twice. 976 cpu->wakeCPU(); 977 cpu->activityThisCycle(); 978
|
1150 if (store_idx == storeHead) {
| 979 /* We 'need' a copy here because we may clear the entry from the 980 * store queue. */ 981 DynInstPtr store_inst = store_idx->instruction(); 982 if (store_idx == storeQueue.begin()) {
|
1151 do {
| 983 do {
|
1152 incrStIdx(storeHead); 1153
| 984 storeQueue.front().clear(); 985 storeQueue.pop_front();
|
1154 --stores;
| 986 --stores;
|
1155 } while (storeQueue[storeHead].completed && 1156 storeHead != storeTail);
| 987 } while (storeQueue.front().completed() && 988 !storeQueue.empty());
|
1157 1158 iewStage->updateLSQNextCycle = true; 1159 } 1160 1161 DPRINTF(LSQUnit, "Completing store [sn:%lli], idx:%i, store head " 1162 "idx:%i\n",
| 989 990 iewStage->updateLSQNextCycle = true; 991 } 992 993 DPRINTF(LSQUnit, "Completing store [sn:%lli], idx:%i, store head " 994 "idx:%i\n",
|
1163 storeQueue[store_idx].inst->seqNum, store_idx, storeHead);
| 995 store_inst->seqNum, store_idx.idx() - 1, storeQueue.head() - 1);
|
1164 1165#if TRACING_ON 1166 if (DTRACE(O3PipeView)) {
| 996 997#if TRACING_ON 998 if (DTRACE(O3PipeView)) {
|
1167 storeQueue[store_idx].inst->storeTick = 1168 curTick() - storeQueue[store_idx].inst->fetchTick;
| 999 store_idx->instruction()->storeTick = 1000 curTick() - store_idx->instruction()->fetchTick;
|
1169 } 1170#endif 1171 1172 if (isStalled() &&
| 1001 } 1002#endif 1003 1004 if (isStalled() &&
|
1173 storeQueue[store_idx].inst->seqNum == stallingStoreIsn) {
| 1005 store_inst->seqNum == stallingStoreIsn) {
|
1174 DPRINTF(LSQUnit, "Unstalling, stalling store [sn:%lli] " 1175 "load idx:%i\n", 1176 stallingStoreIsn, stallingLoadIdx); 1177 stalled = false; 1178 stallingStoreIsn = 0;
| 1006 DPRINTF(LSQUnit, "Unstalling, stalling store [sn:%lli] " 1007 "load idx:%i\n", 1008 stallingStoreIsn, stallingLoadIdx); 1009 stalled = false; 1010 stallingStoreIsn = 0;
|
1179 iewStage->replayMemInst(loadQueue[stallingLoadIdx]);
| 1011 iewStage->replayMemInst(loadQueue[stallingLoadIdx].instruction());
|
1180 } 1181
| 1012 } 1013
|
1182 storeQueue[store_idx].inst->setCompleted();
| 1014 store_inst->setCompleted();
|
1183 1184 if (needsTSO) { 1185 storeInFlight = false; 1186 } 1187 1188 // Tell the checker we've completed this instruction. Some stores 1189 // may get reported twice to the checker, but the checker can 1190 // handle that case.
| 1015 1016 if (needsTSO) { 1017 storeInFlight = false; 1018 } 1019 1020 // Tell the checker we've completed this instruction. Some stores 1021 // may get reported twice to the checker, but the checker can 1022 // handle that case.
|
1191
| |
1192 // Store conditionals cannot be sent to the checker yet, they have 1193 // to update the misc registers first which should take place 1194 // when they commit
| 1023 // Store conditionals cannot be sent to the checker yet, they have 1024 // to update the misc registers first which should take place 1025 // when they commit
|
1195 if (cpu->checker && !storeQueue[store_idx].inst->isStoreConditional()) { 1196 cpu->checker->verify(storeQueue[store_idx].inst);
| 1026 if (cpu->checker && !store_inst->isStoreConditional()) { 1027 cpu->checker->verify(store_inst);
|
1197 } 1198} 1199 1200template <class Impl> 1201bool
| 1028 } 1029} 1030 1031template <class Impl> 1032bool
|
1202LSQUnit<Impl>::sendStore(PacketPtr data_pkt)
| 1033LSQUnit<Impl>::trySendPacket(bool isLoad, PacketPtr data_pkt)
|
1203{
| 1034{
|
1204 if (!dcachePort->sendTimingReq(data_pkt)) { 1205 // Need to handle becoming blocked on a store. 1206 isStoreBlocked = true; 1207 ++lsqCacheBlocked; 1208 assert(retryPkt == NULL); 1209 retryPkt = data_pkt; 1210 return false; 1211 } 1212 return true; 1213}
| 1035 bool ret = true; 1036 bool cache_got_blocked = false;
|
1214
| 1037
|
1215template <class Impl> 1216void 1217LSQUnit<Impl>::recvRetry() 1218{ 1219 if (isStoreBlocked) { 1220 DPRINTF(LSQUnit, "Receiving retry: store blocked\n"); 1221 assert(retryPkt != NULL);
| 1038 auto state = dynamic_cast<LSQSenderState*>(data_pkt->senderState);
|
1222
| 1039
|
1223 LSQSenderState *state = 1224 dynamic_cast<LSQSenderState *>(retryPkt->senderState);
| 1040 if (!lsq->cacheBlocked() && (isLoad || lsq->storePortAvailable())) { 1041 if (!dcachePort->sendTimingReq(data_pkt)) { 1042 ret = false; 1043 cache_got_blocked = true; 1044 } 1045 } else { 1046 ret = false; 1047 }
|
1225
| 1048
|
1226 if (dcachePort->sendTimingReq(retryPkt)) { 1227 // Don't finish the store unless this is the last packet. 1228 if (!TheISA::HasUnalignedMemAcc || !state->pktToSend || 1229 state->pendingPacket == retryPkt) { 1230 state->pktToSend = false; 1231 storePostSend(retryPkt); 1232 } 1233 retryPkt = NULL;
| 1049 if (ret) { 1050 if (!isLoad) { 1051 lsq->storePortBusy();
|
1234 isStoreBlocked = false;
| 1052 isStoreBlocked = false;
|
1235 1236 // Send any outstanding packet. 1237 if (TheISA::HasUnalignedMemAcc && state->pktToSend) { 1238 assert(state->pendingPacket); 1239 if (sendStore(state->pendingPacket)) { 1240 storePostSend(state->pendingPacket); 1241 } 1242 } 1243 } else { 1244 // Still blocked!
| 1053 } 1054 state->outstanding++; 1055 state->request()->packetSent(); 1056 } else { 1057 if (cache_got_blocked) { 1058 lsq->cacheBlocked(true);
|
1245 ++lsqCacheBlocked; 1246 }
| 1059 ++lsqCacheBlocked; 1060 }
|
| 1061 if (!isLoad) { 1062 assert(state->request() == storeWBIt->request()); 1063 isStoreBlocked = true; 1064 } 1065 state->request()->packetNotSent();
|
1247 }
| 1066 }
|
1248}
| |
1249
| 1067
|
1250template <class Impl> 1251inline void 1252LSQUnit<Impl>::incrStIdx(int &store_idx) const 1253{ 1254 if (++store_idx >= SQEntries) 1255 store_idx = 0;
| 1068 return ret;
|
1256} 1257 1258template <class Impl>
| 1069} 1070 1071template <class Impl>
|
1259inline void 1260LSQUnit<Impl>::decrStIdx(int &store_idx) const
| 1072void 1073LSQUnit<Impl>::recvRetry()
|
1261{
| 1074{
|
1262 if (--store_idx < 0) 1263 store_idx += SQEntries;
| 1075 if (isStoreBlocked) { 1076 DPRINTF(LSQUnit, "Receiving retry: blocked store\n"); 1077 writebackBlockedStore(); 1078 }
|
1264} 1265 1266template <class Impl>
| 1079} 1080 1081template <class Impl>
|
1267inline void 1268LSQUnit<Impl>::incrLdIdx(int &load_idx) const 1269{ 1270 if (++load_idx >= LQEntries) 1271 load_idx = 0; 1272} 1273 1274template <class Impl> 1275inline void 1276LSQUnit<Impl>::decrLdIdx(int &load_idx) const 1277{ 1278 if (--load_idx < 0) 1279 load_idx += LQEntries; 1280} 1281 1282template <class Impl>
| |
1283void 1284LSQUnit<Impl>::dumpInsts() const 1285{ 1286 cprintf("Load store queue: Dumping instructions.\n"); 1287 cprintf("Load queue size: %i\n", loads); 1288 cprintf("Load queue: "); 1289
| 1082void 1083LSQUnit<Impl>::dumpInsts() const 1084{ 1085 cprintf("Load store queue: Dumping instructions.\n"); 1086 cprintf("Load queue size: %i\n", loads); 1087 cprintf("Load queue: "); 1088
|
1290 int load_idx = loadHead; 1291 1292 while (load_idx != loadTail && loadQueue[load_idx]) { 1293 const DynInstPtr &inst(loadQueue[load_idx]);
| 1089 for (const auto& e: loadQueue) { 1090 const DynInstPtr &inst(e.instruction());
|
1294 cprintf("%s.[sn:%i] ", inst->pcState(), inst->seqNum);
| 1091 cprintf("%s.[sn:%i] ", inst->pcState(), inst->seqNum);
|
1295 1296 incrLdIdx(load_idx);
| |
1297 } 1298 cprintf("\n"); 1299 1300 cprintf("Store queue size: %i\n", stores); 1301 cprintf("Store queue: "); 1302
| 1092 } 1093 cprintf("\n"); 1094 1095 cprintf("Store queue size: %i\n", stores); 1096 cprintf("Store queue: "); 1097
|
1303 int store_idx = storeHead; 1304 1305 while (store_idx != storeTail && storeQueue[store_idx].inst) { 1306 const DynInstPtr &inst(storeQueue[store_idx].inst);
| 1098 for (const auto& e: storeQueue) { 1099 const DynInstPtr &inst(e.instruction());
|
1307 cprintf("%s.[sn:%i] ", inst->pcState(), inst->seqNum);
| 1100 cprintf("%s.[sn:%i] ", inst->pcState(), inst->seqNum);
|
1308 1309 incrStIdx(store_idx);
| |
1310 } 1311 1312 cprintf("\n"); 1313} 1314
| 1101 } 1102 1103 cprintf("\n"); 1104} 1105
|
| 1106template <class Impl> 1107unsigned int 1108LSQUnit<Impl>::cacheLineSize() 1109{ 1110 return cpu->cacheLineSize(); 1111} 1112
|
1315#endif//__CPU_O3_LSQ_UNIT_IMPL_HH__
| 1113#endif//__CPU_O3_LSQ_UNIT_IMPL_HH__
|