lsq_impl.hh revision 13590:d7e018859709
1/* 2 * Copyright (c) 2011-2012, 2014, 2017-2018 ARM Limited 3 * Copyright (c) 2013 Advanced Micro Devices, Inc. 4 * All rights reserved 5 * 6 * The license below extends only to copyright in the software and shall 7 * not be construed as granting a license to any other intellectual 8 * property including but not limited to intellectual property relating 9 * to a hardware implementation of the functionality of the software 10 * licensed hereunder. You may use the software subject to the license 11 * terms below provided that you ensure that this notice is replicated 12 * unmodified and in its entirety in all distributions of the software, 13 * modified or unmodified, in source code or in binary form. 14 * 15 * Copyright (c) 2005-2006 The Regents of The University of Michigan 16 * All rights reserved. 17 * 18 * Redistribution and use in source and binary forms, with or without 19 * modification, are permitted provided that the following conditions are 20 * met: redistributions of source code must retain the above copyright 21 * notice, this list of conditions and the following disclaimer; 22 * redistributions in binary form must reproduce the above copyright 23 * notice, this list of conditions and the following disclaimer in the 24 * documentation and/or other materials provided with the distribution; 25 * neither the name of the copyright holders nor the names of its 26 * contributors may be used to endorse or promote products derived from 27 * this software without specific prior written permission. 28 * 29 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 30 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 31 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 32 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 33 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 34 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 35 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 36 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 37 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 38 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 39 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 40 * 41 * Authors: Korey Sewell 42 */ 43 44#ifndef __CPU_O3_LSQ_IMPL_HH__ 45#define __CPU_O3_LSQ_IMPL_HH__ 46 47#include <algorithm> 48#include <list> 49#include <string> 50 51#include "base/logging.hh" 52#include "cpu/o3/lsq.hh" 53#include "debug/Drain.hh" 54#include "debug/Fetch.hh" 55#include "debug/LSQ.hh" 56#include "debug/Writeback.hh" 57#include "params/DerivO3CPU.hh" 58 59using namespace std; 60 61template <class Impl> 62LSQ<Impl>::LSQ(O3CPU *cpu_ptr, IEW *iew_ptr, DerivO3CPUParams *params) 63 : cpu(cpu_ptr), iewStage(iew_ptr), 64 _cacheBlocked(false), 65 cacheStorePorts(params->cacheStorePorts), usedStorePorts(0), 66 lsqPolicy(params->smtLSQPolicy), 67 LQEntries(params->LQEntries), 68 SQEntries(params->SQEntries), 69 maxLQEntries(maxLSQAllocation(lsqPolicy, LQEntries, params->numThreads, 70 params->smtLSQThreshold)), 71 maxSQEntries(maxLSQAllocation(lsqPolicy, SQEntries, params->numThreads, 72 params->smtLSQThreshold)), 73 numThreads(params->numThreads) 74{ 75 assert(numThreads > 0 && numThreads <= Impl::MaxThreads); 76 77 //**********************************************/ 78 //************ Handle SMT Parameters ***********/ 79 //**********************************************/ 80 81 /* Run SMT olicy checks. */ 82 if (lsqPolicy == SMTQueuePolicy::Dynamic) { 83 DPRINTF(LSQ, "LSQ sharing policy set to Dynamic\n"); 84 } else if (lsqPolicy == SMTQueuePolicy::Partitioned) { 85 DPRINTF(Fetch, "LSQ sharing policy set to Partitioned: " 86 "%i entries per LQ | %i entries per SQ\n", 87 maxLQEntries,maxSQEntries); 88 } else if (lsqPolicy == SMTQueuePolicy::Threshold) { 89 90 assert(params->smtLSQThreshold > params->LQEntries); 91 assert(params->smtLSQThreshold > params->SQEntries); 92 93 DPRINTF(LSQ, "LSQ sharing policy set to Threshold: " 94 "%i entries per LQ | %i entries per SQ\n", 95 maxLQEntries,maxSQEntries); 96 } else { 97 panic("Invalid LSQ sharing policy. Options are: Dynamic, " 98 "Partitioned, Threshold"); 99 } 100 101 thread.reserve(numThreads); 102 for (ThreadID tid = 0; tid < numThreads; tid++) { 103 thread.emplace_back(maxLQEntries, maxSQEntries); 104 thread[tid].init(cpu, iew_ptr, params, this, tid); 105 thread[tid].setDcachePort(&cpu_ptr->getDataPort()); 106 } 107} 108 109 110template<class Impl> 111std::string 112LSQ<Impl>::name() const 113{ 114 return iewStage->name() + ".lsq"; 115} 116 117template<class Impl> 118void 119LSQ<Impl>::regStats() 120{ 121 //Initialize LSQs 122 for (ThreadID tid = 0; tid < numThreads; tid++) { 123 thread[tid].regStats(); 124 } 125} 126 127template<class Impl> 128void 129LSQ<Impl>::setActiveThreads(list<ThreadID> *at_ptr) 130{ 131 activeThreads = at_ptr; 132 assert(activeThreads != 0); 133} 134 135template <class Impl> 136void 137LSQ<Impl>::drainSanityCheck() const 138{ 139 assert(isDrained()); 140 141 for (ThreadID tid = 0; tid < numThreads; tid++) 142 thread[tid].drainSanityCheck(); 143} 144 145template <class Impl> 146bool 147LSQ<Impl>::isDrained() const 148{ 149 bool drained(true); 150 151 if (!lqEmpty()) { 152 DPRINTF(Drain, "Not drained, LQ not empty.\n"); 153 drained = false; 154 } 155 156 if (!sqEmpty()) { 157 DPRINTF(Drain, "Not drained, SQ not empty.\n"); 158 drained = false; 159 } 160 161 return drained; 162} 163 164template <class Impl> 165void 166LSQ<Impl>::takeOverFrom() 167{ 168 usedStorePorts = 0; 169 _cacheBlocked = false; 170 171 for (ThreadID tid = 0; tid < numThreads; tid++) { 172 thread[tid].takeOverFrom(); 173 } 174} 175 176template<class Impl> 177bool 178LSQ<Impl>::cacheBlocked() const 179{ 180 return _cacheBlocked; 181} 182 183template<class Impl> 184void 185LSQ<Impl>::cacheBlocked(bool v) 186{ 187 _cacheBlocked = v; 188} 189 190template<class Impl> 191bool 192LSQ<Impl>::storePortAvailable() const 193{ 194 return usedStorePorts < cacheStorePorts; 195} 196 197template<class Impl> 198void 199LSQ<Impl>::storePortBusy() 200{ 201 usedStorePorts++; 202 assert(usedStorePorts <= cacheStorePorts); 203} 204 205template<class Impl> 206void 207LSQ<Impl>::insertLoad(const DynInstPtr &load_inst) 208{ 209 ThreadID tid = load_inst->threadNumber; 210 211 thread[tid].insertLoad(load_inst); 212} 213 214template<class Impl> 215void 216LSQ<Impl>::insertStore(const DynInstPtr &store_inst) 217{ 218 ThreadID tid = store_inst->threadNumber; 219 220 thread[tid].insertStore(store_inst); 221} 222 223template<class Impl> 224Fault 225LSQ<Impl>::executeLoad(const DynInstPtr &inst) 226{ 227 ThreadID tid = inst->threadNumber; 228 229 return thread[tid].executeLoad(inst); 230} 231 232template<class Impl> 233Fault 234LSQ<Impl>::executeStore(const DynInstPtr &inst) 235{ 236 ThreadID tid = inst->threadNumber; 237 238 return thread[tid].executeStore(inst); 239} 240 241template<class Impl> 242void 243LSQ<Impl>::writebackStores() 244{ 245 list<ThreadID>::iterator threads = activeThreads->begin(); 246 list<ThreadID>::iterator end = activeThreads->end(); 247 248 while (threads != end) { 249 ThreadID tid = *threads++; 250 251 if (numStoresToWB(tid) > 0) { 252 DPRINTF(Writeback,"[tid:%i] Writing back stores. %i stores " 253 "available for Writeback.\n", tid, numStoresToWB(tid)); 254 } 255 256 thread[tid].writebackStores(); 257 } 258} 259 260template<class Impl> 261bool 262LSQ<Impl>::violation() 263{ 264 /* Answers: Does Anybody Have a Violation?*/ 265 list<ThreadID>::iterator threads = activeThreads->begin(); 266 list<ThreadID>::iterator end = activeThreads->end(); 267 268 while (threads != end) { 269 ThreadID tid = *threads++; 270 271 if (thread[tid].violation()) 272 return true; 273 } 274 275 return false; 276} 277 278template <class Impl> 279void 280LSQ<Impl>::recvReqRetry() 281{ 282 iewStage->cacheUnblocked(); 283 cacheBlocked(false); 284 285 for (ThreadID tid : *activeThreads) { 286 thread[tid].recvRetry(); 287 } 288} 289 290template <class Impl> 291void 292LSQ<Impl>::completeDataAccess(PacketPtr pkt) 293{ 294 auto senderState = dynamic_cast<LSQSenderState*>(pkt->senderState); 295 thread[cpu->contextToThread(senderState->contextId())] 296 .completeDataAccess(pkt); 297} 298 299template <class Impl> 300bool 301LSQ<Impl>::recvTimingResp(PacketPtr pkt) 302{ 303 if (pkt->isError()) 304 DPRINTF(LSQ, "Got error packet back for address: %#X\n", 305 pkt->getAddr()); 306 307 auto senderState = dynamic_cast<LSQSenderState*>(pkt->senderState); 308 panic_if(!senderState, "Got packet back with unknown sender state\n"); 309 310 thread[cpu->contextToThread(senderState->contextId())].recvTimingResp(pkt); 311 312 if (pkt->isInvalidate()) { 313 // This response also contains an invalidate; e.g. this can be the case 314 // if cmd is ReadRespWithInvalidate. 315 // 316 // The calling order between completeDataAccess and checkSnoop matters. 317 // By calling checkSnoop after completeDataAccess, we ensure that the 318 // fault set by checkSnoop is not lost. Calling writeback (more 319 // specifically inst->completeAcc) in completeDataAccess overwrites 320 // fault, and in case this instruction requires squashing (as 321 // determined by checkSnoop), the ReExec fault set by checkSnoop would 322 // be lost otherwise. 323 324 DPRINTF(LSQ, "received invalidation with response for addr:%#x\n", 325 pkt->getAddr()); 326 327 for (ThreadID tid = 0; tid < numThreads; tid++) { 328 thread[tid].checkSnoop(pkt); 329 } 330 } 331 // Update the LSQRequest state (this may delete the request) 332 senderState->request()->packetReplied(); 333 334 return true; 335} 336 337template <class Impl> 338void 339LSQ<Impl>::recvTimingSnoopReq(PacketPtr pkt) 340{ 341 DPRINTF(LSQ, "received pkt for addr:%#x %s\n", pkt->getAddr(), 342 pkt->cmdString()); 343 344 // must be a snoop 345 if (pkt->isInvalidate()) { 346 DPRINTF(LSQ, "received invalidation for addr:%#x\n", 347 pkt->getAddr()); 348 for (ThreadID tid = 0; tid < numThreads; tid++) { 349 thread[tid].checkSnoop(pkt); 350 } 351 } 352} 353 354template<class Impl> 355int 356LSQ<Impl>::getCount() 357{ 358 unsigned total = 0; 359 360 list<ThreadID>::iterator threads = activeThreads->begin(); 361 list<ThreadID>::iterator end = activeThreads->end(); 362 363 while (threads != end) { 364 ThreadID tid = *threads++; 365 366 total += getCount(tid); 367 } 368 369 return total; 370} 371 372template<class Impl> 373int 374LSQ<Impl>::numLoads() 375{ 376 unsigned total = 0; 377 378 list<ThreadID>::iterator threads = activeThreads->begin(); 379 list<ThreadID>::iterator end = activeThreads->end(); 380 381 while (threads != end) { 382 ThreadID tid = *threads++; 383 384 total += numLoads(tid); 385 } 386 387 return total; 388} 389 390template<class Impl> 391int 392LSQ<Impl>::numStores() 393{ 394 unsigned total = 0; 395 396 list<ThreadID>::iterator threads = activeThreads->begin(); 397 list<ThreadID>::iterator end = activeThreads->end(); 398 399 while (threads != end) { 400 ThreadID tid = *threads++; 401 402 total += thread[tid].numStores(); 403 } 404 405 return total; 406} 407 408template<class Impl> 409unsigned 410LSQ<Impl>::numFreeLoadEntries() 411{ 412 unsigned total = 0; 413 414 list<ThreadID>::iterator threads = activeThreads->begin(); 415 list<ThreadID>::iterator end = activeThreads->end(); 416 417 while (threads != end) { 418 ThreadID tid = *threads++; 419 420 total += thread[tid].numFreeLoadEntries(); 421 } 422 423 return total; 424} 425 426template<class Impl> 427unsigned 428LSQ<Impl>::numFreeStoreEntries() 429{ 430 unsigned total = 0; 431 432 list<ThreadID>::iterator threads = activeThreads->begin(); 433 list<ThreadID>::iterator end = activeThreads->end(); 434 435 while (threads != end) { 436 ThreadID tid = *threads++; 437 438 total += thread[tid].numFreeStoreEntries(); 439 } 440 441 return total; 442} 443 444template<class Impl> 445unsigned 446LSQ<Impl>::numFreeLoadEntries(ThreadID tid) 447{ 448 return thread[tid].numFreeLoadEntries(); 449} 450 451template<class Impl> 452unsigned 453LSQ<Impl>::numFreeStoreEntries(ThreadID tid) 454{ 455 return thread[tid].numFreeStoreEntries(); 456} 457 458template<class Impl> 459bool 460LSQ<Impl>::isFull() 461{ 462 list<ThreadID>::iterator threads = activeThreads->begin(); 463 list<ThreadID>::iterator end = activeThreads->end(); 464 465 while (threads != end) { 466 ThreadID tid = *threads++; 467 468 if (!(thread[tid].lqFull() || thread[tid].sqFull())) 469 return false; 470 } 471 472 return true; 473} 474 475template<class Impl> 476bool 477LSQ<Impl>::isFull(ThreadID tid) 478{ 479 //@todo: Change to Calculate All Entries for 480 //Dynamic Policy 481 if (lsqPolicy == SMTQueuePolicy::Dynamic) 482 return isFull(); 483 else 484 return thread[tid].lqFull() || thread[tid].sqFull(); 485} 486 487template<class Impl> 488bool 489LSQ<Impl>::isEmpty() const 490{ 491 return lqEmpty() && sqEmpty(); 492} 493 494template<class Impl> 495bool 496LSQ<Impl>::lqEmpty() const 497{ 498 list<ThreadID>::const_iterator threads = activeThreads->begin(); 499 list<ThreadID>::const_iterator end = activeThreads->end(); 500 501 while (threads != end) { 502 ThreadID tid = *threads++; 503 504 if (!thread[tid].lqEmpty()) 505 return false; 506 } 507 508 return true; 509} 510 511template<class Impl> 512bool 513LSQ<Impl>::sqEmpty() const 514{ 515 list<ThreadID>::const_iterator threads = activeThreads->begin(); 516 list<ThreadID>::const_iterator end = activeThreads->end(); 517 518 while (threads != end) { 519 ThreadID tid = *threads++; 520 521 if (!thread[tid].sqEmpty()) 522 return false; 523 } 524 525 return true; 526} 527 528template<class Impl> 529bool 530LSQ<Impl>::lqFull() 531{ 532 list<ThreadID>::iterator threads = activeThreads->begin(); 533 list<ThreadID>::iterator end = activeThreads->end(); 534 535 while (threads != end) { 536 ThreadID tid = *threads++; 537 538 if (!thread[tid].lqFull()) 539 return false; 540 } 541 542 return true; 543} 544 545template<class Impl> 546bool 547LSQ<Impl>::lqFull(ThreadID tid) 548{ 549 //@todo: Change to Calculate All Entries for 550 //Dynamic Policy 551 if (lsqPolicy == SMTQueuePolicy::Dynamic) 552 return lqFull(); 553 else 554 return thread[tid].lqFull(); 555} 556 557template<class Impl> 558bool 559LSQ<Impl>::sqFull() 560{ 561 list<ThreadID>::iterator threads = activeThreads->begin(); 562 list<ThreadID>::iterator end = activeThreads->end(); 563 564 while (threads != end) { 565 ThreadID tid = *threads++; 566 567 if (!sqFull(tid)) 568 return false; 569 } 570 571 return true; 572} 573 574template<class Impl> 575bool 576LSQ<Impl>::sqFull(ThreadID tid) 577{ 578 //@todo: Change to Calculate All Entries for 579 //Dynamic Policy 580 if (lsqPolicy == SMTQueuePolicy::Dynamic) 581 return sqFull(); 582 else 583 return thread[tid].sqFull(); 584} 585 586template<class Impl> 587bool 588LSQ<Impl>::isStalled() 589{ 590 list<ThreadID>::iterator threads = activeThreads->begin(); 591 list<ThreadID>::iterator end = activeThreads->end(); 592 593 while (threads != end) { 594 ThreadID tid = *threads++; 595 596 if (!thread[tid].isStalled()) 597 return false; 598 } 599 600 return true; 601} 602 603template<class Impl> 604bool 605LSQ<Impl>::isStalled(ThreadID tid) 606{ 607 if (lsqPolicy == SMTQueuePolicy::Dynamic) 608 return isStalled(); 609 else 610 return thread[tid].isStalled(); 611} 612 613template<class Impl> 614bool 615LSQ<Impl>::hasStoresToWB() 616{ 617 list<ThreadID>::iterator threads = activeThreads->begin(); 618 list<ThreadID>::iterator end = activeThreads->end(); 619 620 while (threads != end) { 621 ThreadID tid = *threads++; 622 623 if (hasStoresToWB(tid)) 624 return true; 625 } 626 627 return false; 628} 629 630template<class Impl> 631bool 632LSQ<Impl>::willWB() 633{ 634 list<ThreadID>::iterator threads = activeThreads->begin(); 635 list<ThreadID>::iterator end = activeThreads->end(); 636 637 while (threads != end) { 638 ThreadID tid = *threads++; 639 640 if (willWB(tid)) 641 return true; 642 } 643 644 return false; 645} 646 647template<class Impl> 648void 649LSQ<Impl>::dumpInsts() const 650{ 651 list<ThreadID>::const_iterator threads = activeThreads->begin(); 652 list<ThreadID>::const_iterator end = activeThreads->end(); 653 654 while (threads != end) { 655 ThreadID tid = *threads++; 656 657 thread[tid].dumpInsts(); 658 } 659} 660 661static Addr 662addrBlockOffset(Addr addr, unsigned int block_size) 663{ 664 return addr & (block_size - 1); 665} 666 667static Addr 668addrBlockAlign(Addr addr, uint64_t block_size) 669{ 670 return addr & ~(block_size - 1); 671} 672 673static bool 674transferNeedsBurst(Addr addr, uint64_t size, uint64_t block_size) 675{ 676 return (addrBlockOffset(addr, block_size) + size) > block_size; 677} 678 679template<class Impl> 680Fault 681LSQ<Impl>::pushRequest(const DynInstPtr& inst, bool isLoad, uint8_t *data, 682 unsigned int size, Addr addr, Request::Flags flags, 683 uint64_t *res) 684{ 685 ThreadID tid = cpu->contextToThread(inst->contextId()); 686 auto cacheLineSize = cpu->cacheLineSize(); 687 bool needs_burst = transferNeedsBurst(addr, size, cacheLineSize); 688 LSQRequest* req = nullptr; 689 690 if (inst->translationStarted()) { 691 req = inst->savedReq; 692 assert(req); 693 } else { 694 if (needs_burst) { 695 req = new SplitDataRequest(&thread[tid], inst, isLoad, addr, 696 size, flags, data, res); 697 } else { 698 req = new SingleDataRequest(&thread[tid], inst, isLoad, addr, 699 size, flags, data, res); 700 } 701 assert(req); 702 inst->setRequest(); 703 req->taskId(cpu->taskId()); 704 705 req->initiateTranslation(); 706 } 707 708 /* This is the place were instructions get the effAddr. */ 709 if (req->isTranslationComplete()) { 710 if (inst->getFault() == NoFault) { 711 inst->effAddr = req->getVaddr(); 712 inst->effSize = size; 713 inst->effAddrValid(true); 714 715 if (cpu->checker) { 716 inst->reqToVerify = std::make_shared<Request>(*req->request()); 717 } 718 if (isLoad) 719 inst->getFault() = cpu->read(req, inst->lqIdx); 720 else 721 inst->getFault() = cpu->write(req, data, inst->sqIdx); 722 } else if (isLoad) { 723 // Commit will have to clean up whatever happened. Set this 724 // instruction as executed. 725 inst->setExecuted(); 726 } 727 } 728 729 if (inst->traceData) 730 inst->traceData->setMem(addr, size, flags); 731 732 return inst->getFault(); 733} 734 735template<class Impl> 736void 737LSQ<Impl>::SingleDataRequest::finish(const Fault &fault, const RequestPtr &req, 738 ThreadContext* tc, BaseTLB::Mode mode) 739{ 740 _fault.push_back(fault); 741 numInTranslationFragments = 0; 742 numTranslatedFragments = 1; 743 /* If the instruction has been squahsed, let the request know 744 * as it may have to self-destruct. */ 745 if (_inst->isSquashed()) { 746 this->squashTranslation(); 747 } else { 748 _inst->strictlyOrdered(req->isStrictlyOrdered()); 749 750 flags.set(Flag::TranslationFinished); 751 if (fault == NoFault) { 752 _inst->physEffAddr = req->getPaddr(); 753 _inst->memReqFlags = req->getFlags(); 754 if (req->isCondSwap()) { 755 assert(_res); 756 req->setExtraData(*_res); 757 } 758 setState(State::Request); 759 } else { 760 setState(State::Fault); 761 } 762 763 LSQRequest::_inst->fault = fault; 764 LSQRequest::_inst->translationCompleted(true); 765 } 766} 767 768template<class Impl> 769void 770LSQ<Impl>::SplitDataRequest::finish(const Fault &fault, const RequestPtr &req, 771 ThreadContext* tc, BaseTLB::Mode mode) 772{ 773 _fault.push_back(fault); 774 assert(req == _requests[numTranslatedFragments] || this->isDelayed()); 775 776 numInTranslationFragments--; 777 numTranslatedFragments++; 778 779 mainReq->setFlags(req->getFlags()); 780 781 if (numTranslatedFragments == _requests.size()) { 782 if (_inst->isSquashed()) { 783 this->squashTranslation(); 784 } else { 785 _inst->strictlyOrdered(mainReq->isStrictlyOrdered()); 786 flags.set(Flag::TranslationFinished); 787 auto fault_it = _fault.begin(); 788 /* Ffwd to the first NoFault. */ 789 while (fault_it != _fault.end() && *fault_it == NoFault) 790 fault_it++; 791 /* If none of the fragments faulted: */ 792 if (fault_it == _fault.end()) { 793 _inst->physEffAddr = request(0)->getPaddr(); 794 795 _inst->memReqFlags = mainReq->getFlags(); 796 if (mainReq->isCondSwap()) { 797 assert(_res); 798 mainReq->setExtraData(*_res); 799 } 800 setState(State::Request); 801 _inst->fault = NoFault; 802 } else { 803 setState(State::Fault); 804 _inst->fault = *fault_it; 805 } 806 _inst->translationCompleted(true); 807 } 808 } 809} 810 811template<class Impl> 812void 813LSQ<Impl>::SingleDataRequest::initiateTranslation() 814{ 815 _inst->translationStarted(true); 816 setState(State::Translation); 817 flags.set(Flag::TranslationStarted); 818 819 _inst->savedReq = this; 820 sendFragmentToTranslation(0); 821 822 if (isTranslationComplete()) { 823 } 824} 825 826template<class Impl> 827PacketPtr 828LSQ<Impl>::SplitDataRequest::mainPacket() 829{ 830 return _mainPacket; 831} 832 833template<class Impl> 834RequestPtr 835LSQ<Impl>::SplitDataRequest::mainRequest() 836{ 837 return mainReq; 838} 839 840template<class Impl> 841void 842LSQ<Impl>::SplitDataRequest::initiateTranslation() 843{ 844 _inst->translationStarted(true); 845 setState(State::Translation); 846 flags.set(Flag::TranslationStarted); 847 848 unsigned int cacheLineSize = _port.cacheLineSize(); 849 Addr base_addr = _addr; 850 Addr next_addr = addrBlockAlign(_addr + cacheLineSize, cacheLineSize); 851 Addr final_addr = addrBlockAlign(_addr + _size, cacheLineSize); 852 uint32_t size_so_far = 0; 853 854 mainReq = std::make_shared<Request>(_inst->getASID(), base_addr, 855 _size, _flags, _inst->masterId(), 856 _inst->instAddr(), _inst->contextId()); 857 858 // Paddr is not used in mainReq. However, we will accumulate the flags 859 // from the sub requests into mainReq by calling setFlags() in finish(). 860 // setFlags() assumes that paddr is set so flip the paddr valid bit here to 861 // avoid a potential assert in setFlags() when we call it from finish(). 862 mainReq->setPaddr(0); 863 864 /* Get the pre-fix, possibly unaligned. */ 865 _requests.push_back(std::make_shared<Request>(_inst->getASID(), base_addr, 866 next_addr - base_addr, _flags, _inst->masterId(), 867 _inst->instAddr(), _inst->contextId())); 868 size_so_far = next_addr - base_addr; 869 870 /* We are block aligned now, reading whole blocks. */ 871 base_addr = next_addr; 872 while (base_addr != final_addr) { 873 _requests.push_back(std::make_shared<Request>(_inst->getASID(), 874 base_addr, cacheLineSize, _flags, _inst->masterId(), 875 _inst->instAddr(), _inst->contextId())); 876 size_so_far += cacheLineSize; 877 base_addr += cacheLineSize; 878 } 879 880 /* Deal with the tail. */ 881 if (size_so_far < _size) { 882 _requests.push_back(std::make_shared<Request>(_inst->getASID(), 883 base_addr, _size - size_so_far, _flags, _inst->masterId(), 884 _inst->instAddr(), _inst->contextId())); 885 } 886 887 /* Setup the requests and send them to translation. */ 888 for (auto& r: _requests) { 889 r->setReqInstSeqNum(_inst->seqNum); 890 r->taskId(_taskId); 891 } 892 this->_inst->savedReq = this; 893 numInTranslationFragments = 0; 894 numTranslatedFragments = 0; 895 896 for (uint32_t i = 0; i < _requests.size(); i++) { 897 sendFragmentToTranslation(i); 898 } 899} 900 901template<class Impl> 902void 903LSQ<Impl>::LSQRequest::sendFragmentToTranslation(int i) 904{ 905 numInTranslationFragments++; 906 _port.dTLB()->translateTiming( 907 this->request(i), 908 this->_inst->thread->getTC(), this, 909 this->isLoad() ? BaseTLB::Read : BaseTLB::Write); 910} 911 912template<class Impl> 913bool 914LSQ<Impl>::SingleDataRequest::recvTimingResp(PacketPtr pkt) 915{ 916 assert(_numOutstandingPackets == 1); 917 auto state = dynamic_cast<LSQSenderState*>(pkt->senderState); 918 setState(State::Complete); 919 flags.set(Flag::Complete); 920 state->outstanding--; 921 assert(pkt == _packets.front()); 922 _port.completeDataAccess(pkt); 923 return true; 924} 925 926template<class Impl> 927bool 928LSQ<Impl>::SplitDataRequest::recvTimingResp(PacketPtr pkt) 929{ 930 auto state = dynamic_cast<LSQSenderState*>(pkt->senderState); 931 uint32_t pktIdx = 0; 932 while (pktIdx < _packets.size() && pkt != _packets[pktIdx]) 933 pktIdx++; 934 assert(pktIdx < _packets.size()); 935 assert(pkt->req == _requests[pktIdx]); 936 assert(pkt == _packets[pktIdx]); 937 numReceivedPackets++; 938 state->outstanding--; 939 if (numReceivedPackets == _packets.size()) { 940 setState(State::Complete); 941 flags.set(Flag::Complete); 942 /* Assemble packets. */ 943 PacketPtr resp = isLoad() 944 ? Packet::createRead(mainReq) 945 : Packet::createWrite(mainReq); 946 if (isLoad()) 947 resp->dataStatic(_inst->memData); 948 else 949 resp->dataStatic(_data); 950 resp->senderState = _senderState; 951 _port.completeDataAccess(resp); 952 delete resp; 953 } 954 return true; 955} 956 957template<class Impl> 958void 959LSQ<Impl>::SingleDataRequest::buildPackets() 960{ 961 assert(_senderState); 962 /* Retries do not create new packets. */ 963 if (_packets.size() == 0) { 964 _packets.push_back( 965 isLoad() 966 ? Packet::createRead(request()) 967 : Packet::createWrite(request())); 968 _packets.back()->dataStatic(_inst->memData); 969 _packets.back()->senderState = _senderState; 970 } 971 assert(_packets.size() == 1); 972} 973 974template<class Impl> 975void 976LSQ<Impl>::SplitDataRequest::buildPackets() 977{ 978 /* Extra data?? */ 979 ptrdiff_t offset = 0; 980 if (_packets.size() == 0) { 981 /* New stuff */ 982 if (isLoad()) { 983 _mainPacket = Packet::createRead(mainReq); 984 _mainPacket->dataStatic(_inst->memData); 985 } 986 for (auto& r: _requests) { 987 PacketPtr pkt = isLoad() ? Packet::createRead(r) 988 : Packet::createWrite(r); 989 if (isLoad()) { 990 pkt->dataStatic(_inst->memData + offset); 991 } else { 992 uint8_t* req_data = new uint8_t[r->getSize()]; 993 std::memcpy(req_data, 994 _inst->memData + offset, 995 r->getSize()); 996 pkt->dataDynamic(req_data); 997 } 998 offset += r->getSize(); 999 pkt->senderState = _senderState; 1000 _packets.push_back(pkt); 1001 } 1002 } 1003 assert(_packets.size() == _requests.size()); 1004} 1005 1006template<class Impl> 1007void 1008LSQ<Impl>::SingleDataRequest::sendPacketToCache() 1009{ 1010 assert(_numOutstandingPackets == 0); 1011 if (lsqUnit()->trySendPacket(isLoad(), _packets.at(0))) 1012 _numOutstandingPackets = 1; 1013} 1014 1015template<class Impl> 1016void 1017LSQ<Impl>::SplitDataRequest::sendPacketToCache() 1018{ 1019 /* Try to send the packets. */ 1020 while (numReceivedPackets + _numOutstandingPackets < _packets.size() && 1021 lsqUnit()->trySendPacket(isLoad(), 1022 _packets.at(numReceivedPackets + _numOutstandingPackets))) { 1023 _numOutstandingPackets++; 1024 } 1025} 1026 1027template<class Impl> 1028void 1029LSQ<Impl>::SingleDataRequest::handleIprWrite(ThreadContext *thread, 1030 PacketPtr pkt) 1031{ 1032 TheISA::handleIprWrite(thread, pkt); 1033} 1034 1035template<class Impl> 1036void 1037LSQ<Impl>::SplitDataRequest::handleIprWrite(ThreadContext *thread, 1038 PacketPtr mainPkt) 1039{ 1040 unsigned offset = 0; 1041 for (auto r: _requests) { 1042 PacketPtr pkt = new Packet(r, MemCmd::WriteReq); 1043 pkt->dataStatic(mainPkt->getPtr<uint8_t>() + offset); 1044 TheISA::handleIprWrite(thread, pkt); 1045 offset += r->getSize(); 1046 delete pkt; 1047 } 1048} 1049 1050template<class Impl> 1051Cycles 1052LSQ<Impl>::SingleDataRequest::handleIprRead(ThreadContext *thread, 1053 PacketPtr pkt) 1054{ 1055 return TheISA::handleIprRead(thread, pkt); 1056} 1057 1058template<class Impl> 1059Cycles 1060LSQ<Impl>::SplitDataRequest::handleIprRead(ThreadContext *thread, 1061 PacketPtr mainPkt) 1062{ 1063 Cycles delay(0); 1064 unsigned offset = 0; 1065 1066 for (auto r: _requests) { 1067 PacketPtr pkt = new Packet(r, MemCmd::ReadReq); 1068 pkt->dataStatic(mainPkt->getPtr<uint8_t>() + offset); 1069 Cycles d = TheISA::handleIprRead(thread, pkt); 1070 if (d > delay) 1071 delay = d; 1072 offset += r->getSize(); 1073 delete pkt; 1074 } 1075 return delay; 1076} 1077 1078template<class Impl> 1079bool 1080LSQ<Impl>::SingleDataRequest::isCacheBlockHit(Addr blockAddr, Addr blockMask) 1081{ 1082 return ( (LSQRequest::_requests[0]->getPaddr() & blockMask) == blockAddr); 1083} 1084 1085template<class Impl> 1086bool 1087LSQ<Impl>::SplitDataRequest::isCacheBlockHit(Addr blockAddr, Addr blockMask) 1088{ 1089 bool is_hit = false; 1090 for (auto &r: _requests) { 1091 if ((r->getPaddr() & blockMask) == blockAddr) { 1092 is_hit = true; 1093 break; 1094 } 1095 } 1096 return is_hit; 1097} 1098 1099#endif//__CPU_O3_LSQ_IMPL_HH__ 1100