lsq_unit_impl.hh revision 2678
1/* 2 * Copyright (c) 2004-2005 The Regents of The University of Michigan 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions are 7 * met: redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer; 9 * redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution; 12 * neither the name of the copyright holders nor the names of its 13 * contributors may be used to endorse or promote products derived from 14 * this software without specific prior written permission. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 17 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 18 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 19 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 20 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 22 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29#include "cpu/checker/cpu.hh" 30#include "cpu/o3/lsq_unit.hh" 31#include "base/str.hh" 32#include "mem/request.hh" 33 34template<class Impl> 35LSQUnit<Impl>::WritebackEvent::WritebackEvent(DynInstPtr &_inst, PacketPtr _pkt, 36 LSQUnit *lsq_ptr) 37 : Event(&mainEventQueue), inst(_inst), pkt(_pkt), lsqPtr(lsq_ptr) 38{ 39 this->setFlags(Event::AutoDelete); 40} 41 42template<class Impl> 43void 44LSQUnit<Impl>::WritebackEvent::process() 45{ 46 if (!lsqPtr->isSwitchedOut()) { 47 lsqPtr->writeback(inst, pkt); 48 } 49 delete pkt; 50} 51 52template<class Impl> 53const char * 54LSQUnit<Impl>::WritebackEvent::description() 55{ 56 return "Store writeback event"; 57} 58 59template<class Impl> 60void 61LSQUnit<Impl>::completeDataAccess(PacketPtr pkt) 62{ 63 LSQSenderState *state = dynamic_cast<LSQSenderState *>(pkt->senderState); 64 DynInstPtr inst = state->inst; 65 DPRINTF(IEW, "Writeback event [sn:%lli]\n", inst->seqNum); 66// DPRINTF(Activity, "Activity: Ld Writeback event [sn:%lli]\n", inst->seqNum); 67 68 //iewStage->ldstQueue.removeMSHR(inst->threadNumber,inst->seqNum); 69 70 if (isSwitchedOut() || inst->isSquashed()) { 71 delete state; 72 delete pkt; 73 return; 74 } else { 75 if (!state->noWB) { 76 writeback(inst, pkt); 77 } 78 79 if (inst->isStore()) { 80 completeStore(state->idx); 81 } 82 } 83 84 delete state; 85 delete pkt; 86} 87 88template <class Impl> 89Tick 90LSQUnit<Impl>::DcachePort::recvAtomic(PacketPtr pkt) 91{ 92 panic("O3CPU model does not work with atomic mode!"); 93 return curTick; 94} 95 96template <class Impl> 97void 98LSQUnit<Impl>::DcachePort::recvFunctional(PacketPtr pkt) 99{ 100 panic("O3CPU doesn't expect recvFunctional callback!"); 101} 102 103template <class Impl> 104void 105LSQUnit<Impl>::DcachePort::recvStatusChange(Status status) 106{ 107 if (status == RangeChange) 108 return; 109 110 panic("O3CPU doesn't expect recvStatusChange callback!"); 111} 112 113template <class Impl> 114bool 115LSQUnit<Impl>::DcachePort::recvTiming(PacketPtr pkt) 116{ 117 lsq->completeDataAccess(pkt); 118 return true; 119} 120 121template <class Impl> 122void 123LSQUnit<Impl>::DcachePort::recvRetry() 124{ 125 panic("Retry unsupported for now!"); 126 // we shouldn't get a retry unless we have a packet that we're 127 // waiting to transmit 128/* 129 assert(cpu->dcache_pkt != NULL); 130 assert(cpu->_status == DcacheRetry); 131 PacketPtr tmp = cpu->dcache_pkt; 132 if (sendTiming(tmp)) { 133 cpu->_status = DcacheWaitResponse; 134 cpu->dcache_pkt = NULL; 135 } 136*/ 137} 138 139template <class Impl> 140LSQUnit<Impl>::LSQUnit() 141 : loads(0), stores(0), storesToWB(0), stalled(false), 142 isStoreBlocked(false), isLoadBlocked(false), 143 loadBlockedHandled(false) 144{ 145} 146 147template<class Impl> 148void 149LSQUnit<Impl>::init(Params *params, unsigned maxLQEntries, 150 unsigned maxSQEntries, unsigned id) 151{ 152 DPRINTF(LSQUnit, "Creating LSQUnit%i object.\n",id); 153 154 switchedOut = false; 155 156 lsqID = id; 157 158 // Add 1 for the sentinel entry (they are circular queues). 159 LQEntries = maxLQEntries + 1; 160 SQEntries = maxSQEntries + 1; 161 162 loadQueue.resize(LQEntries); 163 storeQueue.resize(SQEntries); 164 165 loadHead = loadTail = 0; 166 167 storeHead = storeWBIdx = storeTail = 0; 168 169 usedPorts = 0; 170 cachePorts = params->cachePorts; 171 172 mem = params->mem; 173 174 memDepViolator = NULL; 175 176 blockedLoadSeqNum = 0; 177} 178 179template<class Impl> 180void 181LSQUnit<Impl>::setCPU(FullCPU *cpu_ptr) 182{ 183 cpu = cpu_ptr; 184 dcachePort = new DcachePort(cpu, this); 185 186 Port *mem_dport = mem->getPort(""); 187 dcachePort->setPeer(mem_dport); 188 mem_dport->setPeer(dcachePort); 189} 190 191template<class Impl> 192std::string 193LSQUnit<Impl>::name() const 194{ 195 if (Impl::MaxThreads == 1) { 196 return iewStage->name() + ".lsq"; 197 } else { 198 return iewStage->name() + ".lsq.thread." + to_string(lsqID); 199 } 200} 201 202template<class Impl> 203void 204LSQUnit<Impl>::clearLQ() 205{ 206 loadQueue.clear(); 207} 208 209template<class Impl> 210void 211LSQUnit<Impl>::clearSQ() 212{ 213 storeQueue.clear(); 214} 215 216#if 0 217template<class Impl> 218void 219LSQUnit<Impl>::setPageTable(PageTable *pt_ptr) 220{ 221 DPRINTF(LSQUnit, "Setting the page table pointer.\n"); 222 pTable = pt_ptr; 223} 224#endif 225 226template<class Impl> 227void 228LSQUnit<Impl>::switchOut() 229{ 230 switchedOut = true; 231 for (int i = 0; i < loadQueue.size(); ++i) 232 loadQueue[i] = NULL; 233 234 assert(storesToWB == 0); 235} 236 237template<class Impl> 238void 239LSQUnit<Impl>::takeOverFrom() 240{ 241 switchedOut = false; 242 loads = stores = storesToWB = 0; 243 244 loadHead = loadTail = 0; 245 246 storeHead = storeWBIdx = storeTail = 0; 247 248 usedPorts = 0; 249 250 memDepViolator = NULL; 251 252 blockedLoadSeqNum = 0; 253 254 stalled = false; 255 isLoadBlocked = false; 256 loadBlockedHandled = false; 257} 258 259template<class Impl> 260void 261LSQUnit<Impl>::resizeLQ(unsigned size) 262{ 263 unsigned size_plus_sentinel = size + 1; 264 assert(size_plus_sentinel >= LQEntries); 265 266 if (size_plus_sentinel > LQEntries) { 267 while (size_plus_sentinel > loadQueue.size()) { 268 DynInstPtr dummy; 269 loadQueue.push_back(dummy); 270 LQEntries++; 271 } 272 } else { 273 LQEntries = size_plus_sentinel; 274 } 275 276} 277 278template<class Impl> 279void 280LSQUnit<Impl>::resizeSQ(unsigned size) 281{ 282 unsigned size_plus_sentinel = size + 1; 283 if (size_plus_sentinel > SQEntries) { 284 while (size_plus_sentinel > storeQueue.size()) { 285 SQEntry dummy; 286 storeQueue.push_back(dummy); 287 SQEntries++; 288 } 289 } else { 290 SQEntries = size_plus_sentinel; 291 } 292} 293 294template <class Impl> 295void 296LSQUnit<Impl>::insert(DynInstPtr &inst) 297{ 298 assert(inst->isMemRef()); 299 300 assert(inst->isLoad() || inst->isStore()); 301 302 if (inst->isLoad()) { 303 insertLoad(inst); 304 } else { 305 insertStore(inst); 306 } 307 308 inst->setInLSQ(); 309} 310 311template <class Impl> 312void 313LSQUnit<Impl>::insertLoad(DynInstPtr &load_inst) 314{ 315 assert((loadTail + 1) % LQEntries != loadHead); 316 assert(loads < LQEntries); 317 318 DPRINTF(LSQUnit, "Inserting load PC %#x, idx:%i [sn:%lli]\n", 319 load_inst->readPC(), loadTail, load_inst->seqNum); 320 321 load_inst->lqIdx = loadTail; 322 323 if (stores == 0) { 324 load_inst->sqIdx = -1; 325 } else { 326 load_inst->sqIdx = storeTail; 327 } 328 329 loadQueue[loadTail] = load_inst; 330 331 incrLdIdx(loadTail); 332 333 ++loads; 334} 335 336template <class Impl> 337void 338LSQUnit<Impl>::insertStore(DynInstPtr &store_inst) 339{ 340 // Make sure it is not full before inserting an instruction. 341 assert((storeTail + 1) % SQEntries != storeHead); 342 assert(stores < SQEntries); 343 344 DPRINTF(LSQUnit, "Inserting store PC %#x, idx:%i [sn:%lli]\n", 345 store_inst->readPC(), storeTail, store_inst->seqNum); 346 347 store_inst->sqIdx = storeTail; 348 store_inst->lqIdx = loadTail; 349 350 storeQueue[storeTail] = SQEntry(store_inst); 351 352 incrStIdx(storeTail); 353 354 ++stores; 355} 356 357template <class Impl> 358typename Impl::DynInstPtr 359LSQUnit<Impl>::getMemDepViolator() 360{ 361 DynInstPtr temp = memDepViolator; 362 363 memDepViolator = NULL; 364 365 return temp; 366} 367 368template <class Impl> 369unsigned 370LSQUnit<Impl>::numFreeEntries() 371{ 372 unsigned free_lq_entries = LQEntries - loads; 373 unsigned free_sq_entries = SQEntries - stores; 374 375 // Both the LQ and SQ entries have an extra dummy entry to differentiate 376 // empty/full conditions. Subtract 1 from the free entries. 377 if (free_lq_entries < free_sq_entries) { 378 return free_lq_entries - 1; 379 } else { 380 return free_sq_entries - 1; 381 } 382} 383 384template <class Impl> 385int 386LSQUnit<Impl>::numLoadsReady() 387{ 388 int load_idx = loadHead; 389 int retval = 0; 390 391 while (load_idx != loadTail) { 392 assert(loadQueue[load_idx]); 393 394 if (loadQueue[load_idx]->readyToIssue()) { 395 ++retval; 396 } 397 } 398 399 return retval; 400} 401 402template <class Impl> 403Fault 404LSQUnit<Impl>::executeLoad(DynInstPtr &inst) 405{ 406 // Execute a specific load. 407 Fault load_fault = NoFault; 408 409 DPRINTF(LSQUnit, "Executing load PC %#x, [sn:%lli]\n", 410 inst->readPC(),inst->seqNum); 411 412 load_fault = inst->initiateAcc(); 413 414 // If the instruction faulted, then we need to send it along to commit 415 // without the instruction completing. 416 if (load_fault != NoFault) { 417 // Send this instruction to commit, also make sure iew stage 418 // realizes there is activity. 419 iewStage->instToCommit(inst); 420 iewStage->activityThisCycle(); 421 } 422 423 return load_fault; 424} 425 426template <class Impl> 427Fault 428LSQUnit<Impl>::executeStore(DynInstPtr &store_inst) 429{ 430 using namespace TheISA; 431 // Make sure that a store exists. 432 assert(stores != 0); 433 434 int store_idx = store_inst->sqIdx; 435 436 DPRINTF(LSQUnit, "Executing store PC %#x [sn:%lli]\n", 437 store_inst->readPC(), store_inst->seqNum); 438 439 // Check the recently completed loads to see if any match this store's 440 // address. If so, then we have a memory ordering violation. 441 int load_idx = store_inst->lqIdx; 442 443 Fault store_fault = store_inst->initiateAcc(); 444 445 if (storeQueue[store_idx].size == 0) { 446 DPRINTF(LSQUnit,"Fault on Store PC %#x, [sn:%lli],Size = 0\n", 447 store_inst->readPC(),store_inst->seqNum); 448 449 return store_fault; 450 } 451 452 assert(store_fault == NoFault); 453 454 if (store_inst->isStoreConditional()) { 455 // Store conditionals need to set themselves as able to 456 // writeback if we haven't had a fault by here. 457 storeQueue[store_idx].canWB = true; 458 459 ++storesToWB; 460 } 461 462 if (!memDepViolator) { 463 while (load_idx != loadTail) { 464 // Really only need to check loads that have actually executed 465 // It's safe to check all loads because effAddr is set to 466 // InvalAddr when the dyn inst is created. 467 468 // @todo: For now this is extra conservative, detecting a 469 // violation if the addresses match assuming all accesses 470 // are quad word accesses. 471 472 // @todo: Fix this, magic number being used here 473 if ((loadQueue[load_idx]->effAddr >> 8) == 474 (store_inst->effAddr >> 8)) { 475 // A load incorrectly passed this store. Squash and refetch. 476 // For now return a fault to show that it was unsuccessful. 477 memDepViolator = loadQueue[load_idx]; 478 479 return genMachineCheckFault(); 480 } 481 482 incrLdIdx(load_idx); 483 } 484 485 // If we've reached this point, there was no violation. 486 memDepViolator = NULL; 487 } 488 489 return store_fault; 490} 491 492template <class Impl> 493void 494LSQUnit<Impl>::commitLoad() 495{ 496 assert(loadQueue[loadHead]); 497 498 DPRINTF(LSQUnit, "Committing head load instruction, PC %#x\n", 499 loadQueue[loadHead]->readPC()); 500 501 loadQueue[loadHead] = NULL; 502 503 incrLdIdx(loadHead); 504 505 --loads; 506} 507 508template <class Impl> 509void 510LSQUnit<Impl>::commitLoads(InstSeqNum &youngest_inst) 511{ 512 assert(loads == 0 || loadQueue[loadHead]); 513 514 while (loads != 0 && loadQueue[loadHead]->seqNum <= youngest_inst) { 515 commitLoad(); 516 } 517} 518 519template <class Impl> 520void 521LSQUnit<Impl>::commitStores(InstSeqNum &youngest_inst) 522{ 523 assert(stores == 0 || storeQueue[storeHead].inst); 524 525 int store_idx = storeHead; 526 527 while (store_idx != storeTail) { 528 assert(storeQueue[store_idx].inst); 529 // Mark any stores that are now committed and have not yet 530 // been marked as able to write back. 531 if (!storeQueue[store_idx].canWB) { 532 if (storeQueue[store_idx].inst->seqNum > youngest_inst) { 533 break; 534 } 535 DPRINTF(LSQUnit, "Marking store as able to write back, PC " 536 "%#x [sn:%lli]\n", 537 storeQueue[store_idx].inst->readPC(), 538 storeQueue[store_idx].inst->seqNum); 539 540 storeQueue[store_idx].canWB = true; 541 542 ++storesToWB; 543 } 544 545 incrStIdx(store_idx); 546 } 547} 548 549template <class Impl> 550void 551LSQUnit<Impl>::writebackStores() 552{ 553 while (storesToWB > 0 && 554 storeWBIdx != storeTail && 555 storeQueue[storeWBIdx].inst && 556 storeQueue[storeWBIdx].canWB && 557 usedPorts < cachePorts) { 558 559 if (isStoreBlocked) { 560 DPRINTF(LSQUnit, "Unable to write back any more stores, cache" 561 " is blocked!\n"); 562 break; 563 } 564 565 // Store didn't write any data so no need to write it back to 566 // memory. 567 if (storeQueue[storeWBIdx].size == 0) { 568 completeStore(storeWBIdx); 569 570 incrStIdx(storeWBIdx); 571 572 continue; 573 } 574 575 ++usedPorts; 576 577 if (storeQueue[storeWBIdx].inst->isDataPrefetch()) { 578 incrStIdx(storeWBIdx); 579 580 continue; 581 } 582 583 assert(storeQueue[storeWBIdx].req); 584 assert(!storeQueue[storeWBIdx].committed); 585 586 DynInstPtr inst = storeQueue[storeWBIdx].inst; 587 588 Request *req = storeQueue[storeWBIdx].req; 589 storeQueue[storeWBIdx].committed = true; 590 591 assert(!inst->memData); 592 inst->memData = new uint8_t[64]; 593 memcpy(inst->memData, (uint8_t *)&storeQueue[storeWBIdx].data, 594 req->getSize()); 595 596 PacketPtr data_pkt = new Packet(req, Packet::WriteReq, Packet::Broadcast); 597 data_pkt->dataStatic(inst->memData); 598 599 LSQSenderState *state = new LSQSenderState; 600 state->isLoad = false; 601 state->idx = storeWBIdx; 602 state->inst = inst; 603 data_pkt->senderState = state; 604 605 DPRINTF(LSQUnit, "D-Cache: Writing back store idx:%i PC:%#x " 606 "to Addr:%#x, data:%#x [sn:%lli]\n", 607 storeWBIdx, storeQueue[storeWBIdx].inst->readPC(), 608 req->getPaddr(), *(inst->memData), 609 storeQueue[storeWBIdx].inst->seqNum); 610 611 if (!dcachePort->sendTiming(data_pkt)) { 612 // Need to handle becoming blocked on a store. 613 isStoreBlocked = true; 614 } else { 615 if (isStalled() && 616 storeQueue[storeWBIdx].inst->seqNum == stallingStoreIsn) { 617 DPRINTF(LSQUnit, "Unstalling, stalling store [sn:%lli] " 618 "load idx:%i\n", 619 stallingStoreIsn, stallingLoadIdx); 620 stalled = false; 621 stallingStoreIsn = 0; 622 iewStage->replayMemInst(loadQueue[stallingLoadIdx]); 623 } 624 625 if (!(req->getFlags() & LOCKED)) { 626 assert(!storeQueue[storeWBIdx].inst->isStoreConditional()); 627 // Non-store conditionals do not need a writeback. 628 state->noWB = true; 629 } 630 631 if (data_pkt->result != Packet::Success) { 632 DPRINTF(LSQUnit,"D-Cache Write Miss on idx:%i!\n", 633 storeWBIdx); 634 635 DPRINTF(Activity, "Active st accessing mem miss [sn:%lli]\n", 636 storeQueue[storeWBIdx].inst->seqNum); 637 638 //mshrSeqNums.push_back(storeQueue[storeWBIdx].inst->seqNum); 639 640 //DPRINTF(LSQUnit, "Added MSHR. count = %i\n",mshrSeqNums.size()); 641 642 // @todo: Increment stat here. 643 } else { 644 DPRINTF(LSQUnit,"D-Cache: Write Hit on idx:%i !\n", 645 storeWBIdx); 646 647 DPRINTF(Activity, "Active st accessing mem hit [sn:%lli]\n", 648 storeQueue[storeWBIdx].inst->seqNum); 649 } 650 651 incrStIdx(storeWBIdx); 652 } 653 } 654 655 // Not sure this should set it to 0. 656 usedPorts = 0; 657 658 assert(stores >= 0 && storesToWB >= 0); 659} 660 661/*template <class Impl> 662void 663LSQUnit<Impl>::removeMSHR(InstSeqNum seqNum) 664{ 665 list<InstSeqNum>::iterator mshr_it = find(mshrSeqNums.begin(), 666 mshrSeqNums.end(), 667 seqNum); 668 669 if (mshr_it != mshrSeqNums.end()) { 670 mshrSeqNums.erase(mshr_it); 671 DPRINTF(LSQUnit, "Removing MSHR. count = %i\n",mshrSeqNums.size()); 672 } 673}*/ 674 675template <class Impl> 676void 677LSQUnit<Impl>::squash(const InstSeqNum &squashed_num) 678{ 679 DPRINTF(LSQUnit, "Squashing until [sn:%lli]!" 680 "(Loads:%i Stores:%i)\n", squashed_num, loads, stores); 681 682 int load_idx = loadTail; 683 decrLdIdx(load_idx); 684 685 while (loads != 0 && loadQueue[load_idx]->seqNum > squashed_num) { 686 DPRINTF(LSQUnit,"Load Instruction PC %#x squashed, " 687 "[sn:%lli]\n", 688 loadQueue[load_idx]->readPC(), 689 loadQueue[load_idx]->seqNum); 690 691 if (isStalled() && load_idx == stallingLoadIdx) { 692 stalled = false; 693 stallingStoreIsn = 0; 694 stallingLoadIdx = 0; 695 } 696 697 // Clear the smart pointer to make sure it is decremented. 698 loadQueue[load_idx]->squashed = true; 699 loadQueue[load_idx] = NULL; 700 --loads; 701 702 // Inefficient! 703 loadTail = load_idx; 704 705 decrLdIdx(load_idx); 706 } 707 708 if (isLoadBlocked) { 709 if (squashed_num < blockedLoadSeqNum) { 710 isLoadBlocked = false; 711 loadBlockedHandled = false; 712 blockedLoadSeqNum = 0; 713 } 714 } 715 716 int store_idx = storeTail; 717 decrStIdx(store_idx); 718 719 while (stores != 0 && 720 storeQueue[store_idx].inst->seqNum > squashed_num) { 721 // Instructions marked as can WB are already committed. 722 if (storeQueue[store_idx].canWB) { 723 break; 724 } 725 726 DPRINTF(LSQUnit,"Store Instruction PC %#x squashed, " 727 "idx:%i [sn:%lli]\n", 728 storeQueue[store_idx].inst->readPC(), 729 store_idx, storeQueue[store_idx].inst->seqNum); 730 731 // I don't think this can happen. It should have been cleared 732 // by the stalling load. 733 if (isStalled() && 734 storeQueue[store_idx].inst->seqNum == stallingStoreIsn) { 735 panic("Is stalled should have been cleared by stalling load!\n"); 736 stalled = false; 737 stallingStoreIsn = 0; 738 } 739 740 // Clear the smart pointer to make sure it is decremented. 741 storeQueue[store_idx].inst->squashed = true; 742 storeQueue[store_idx].inst = NULL; 743 storeQueue[store_idx].canWB = 0; 744 745 storeQueue[store_idx].req = NULL; 746 --stores; 747 748 // Inefficient! 749 storeTail = store_idx; 750 751 decrStIdx(store_idx); 752 } 753} 754 755template <class Impl> 756void 757LSQUnit<Impl>::writeback(DynInstPtr &inst, PacketPtr pkt) 758{ 759 iewStage->wakeCPU(); 760 761 // Squashed instructions do not need to complete their access. 762 if (inst->isSquashed()) { 763 assert(!inst->isStore()); 764 return; 765 } 766 767 if (!inst->isExecuted()) { 768 inst->setExecuted(); 769 770 // Complete access to copy data to proper place. 771 inst->completeAcc(pkt); 772 } 773 774 // Need to insert instruction into queue to commit 775 iewStage->instToCommit(inst); 776 777 iewStage->activityThisCycle(); 778} 779 780template <class Impl> 781void 782LSQUnit<Impl>::completeStore(int store_idx) 783{ 784 assert(storeQueue[store_idx].inst); 785 storeQueue[store_idx].completed = true; 786 --storesToWB; 787 // A bit conservative because a store completion may not free up entries, 788 // but hopefully avoids two store completions in one cycle from making 789 // the CPU tick twice. 790 cpu->activityThisCycle(); 791 792 if (store_idx == storeHead) { 793 do { 794 incrStIdx(storeHead); 795 796 --stores; 797 } while (storeQueue[storeHead].completed && 798 storeHead != storeTail); 799 800 iewStage->updateLSQNextCycle = true; 801 } 802 803 DPRINTF(LSQUnit, "Completing store [sn:%lli], idx:%i, store head " 804 "idx:%i\n", 805 storeQueue[store_idx].inst->seqNum, store_idx, storeHead); 806 807 if (isStalled() && 808 storeQueue[store_idx].inst->seqNum == stallingStoreIsn) { 809 DPRINTF(LSQUnit, "Unstalling, stalling store [sn:%lli] " 810 "load idx:%i\n", 811 stallingStoreIsn, stallingLoadIdx); 812 stalled = false; 813 stallingStoreIsn = 0; 814 iewStage->replayMemInst(loadQueue[stallingLoadIdx]); 815 } 816 817 storeQueue[store_idx].inst->setCompleted(); 818 819 // Tell the checker we've completed this instruction. Some stores 820 // may get reported twice to the checker, but the checker can 821 // handle that case. 822 if (cpu->checker) { 823 cpu->checker->tick(storeQueue[store_idx].inst); 824 } 825} 826 827template <class Impl> 828inline void 829LSQUnit<Impl>::incrStIdx(int &store_idx) 830{ 831 if (++store_idx >= SQEntries) 832 store_idx = 0; 833} 834 835template <class Impl> 836inline void 837LSQUnit<Impl>::decrStIdx(int &store_idx) 838{ 839 if (--store_idx < 0) 840 store_idx += SQEntries; 841} 842 843template <class Impl> 844inline void 845LSQUnit<Impl>::incrLdIdx(int &load_idx) 846{ 847 if (++load_idx >= LQEntries) 848 load_idx = 0; 849} 850 851template <class Impl> 852inline void 853LSQUnit<Impl>::decrLdIdx(int &load_idx) 854{ 855 if (--load_idx < 0) 856 load_idx += LQEntries; 857} 858 859template <class Impl> 860void 861LSQUnit<Impl>::dumpInsts() 862{ 863 cprintf("Load store queue: Dumping instructions.\n"); 864 cprintf("Load queue size: %i\n", loads); 865 cprintf("Load queue: "); 866 867 int load_idx = loadHead; 868 869 while (load_idx != loadTail && loadQueue[load_idx]) { 870 cprintf("%#x ", loadQueue[load_idx]->readPC()); 871 872 incrLdIdx(load_idx); 873 } 874 875 cprintf("Store queue size: %i\n", stores); 876 cprintf("Store queue: "); 877 878 int store_idx = storeHead; 879 880 while (store_idx != storeTail && storeQueue[store_idx].inst) { 881 cprintf("%#x ", storeQueue[store_idx].inst->readPC()); 882 883 incrStIdx(store_idx); 884 } 885 886 cprintf("\n"); 887} 888