lsq_impl.hh revision 13449:2f7efa89c58b
1/* 2 * Copyright (c) 2011-2012, 2014 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 LQEntries(params->LQEntries), 65 SQEntries(params->SQEntries), 66 numThreads(params->numThreads) 67{ 68 assert(numThreads > 0 && numThreads <= Impl::MaxThreads); 69 70 //**********************************************/ 71 //************ Handle SMT Parameters ***********/ 72 //**********************************************/ 73 std::string policy = params->smtLSQPolicy; 74 75 //Convert string to lowercase 76 std::transform(policy.begin(), policy.end(), policy.begin(), 77 (int(*)(int)) tolower); 78 79 //Figure out fetch policy 80 if (policy == "dynamic") { 81 lsqPolicy = Dynamic; 82 83 maxLQEntries = LQEntries; 84 maxSQEntries = SQEntries; 85 86 DPRINTF(LSQ, "LSQ sharing policy set to Dynamic\n"); 87 } else if (policy == "partitioned") { 88 lsqPolicy = Partitioned; 89 90 //@todo:make work if part_amt doesnt divide evenly. 91 maxLQEntries = LQEntries / numThreads; 92 maxSQEntries = SQEntries / numThreads; 93 94 DPRINTF(Fetch, "LSQ sharing policy set to Partitioned: " 95 "%i entries per LQ | %i entries per SQ\n", 96 maxLQEntries,maxSQEntries); 97 } else if (policy == "threshold") { 98 lsqPolicy = Threshold; 99 100 assert(params->smtLSQThreshold > LQEntries); 101 assert(params->smtLSQThreshold > SQEntries); 102 103 //Divide up by threshold amount 104 //@todo: Should threads check the max and the total 105 //amount of the LSQ 106 maxLQEntries = params->smtLSQThreshold; 107 maxSQEntries = params->smtLSQThreshold; 108 109 DPRINTF(LSQ, "LSQ sharing policy set to Threshold: " 110 "%i entries per LQ | %i entries per SQ\n", 111 maxLQEntries,maxSQEntries); 112 } else { 113 panic("Invalid LSQ sharing policy. Options are: Dynamic, " 114 "Partitioned, Threshold"); 115 } 116 117 //Initialize LSQs 118 thread = new LSQUnit[numThreads]; 119 for (ThreadID tid = 0; tid < numThreads; tid++) { 120 thread[tid].init(cpu, iew_ptr, params, this, 121 maxLQEntries, maxSQEntries, tid); 122 thread[tid].setDcachePort(&cpu_ptr->getDataPort()); 123 } 124} 125 126 127template<class Impl> 128std::string 129LSQ<Impl>::name() const 130{ 131 return iewStage->name() + ".lsq"; 132} 133 134template<class Impl> 135void 136LSQ<Impl>::regStats() 137{ 138 //Initialize LSQs 139 for (ThreadID tid = 0; tid < numThreads; tid++) { 140 thread[tid].regStats(); 141 } 142} 143 144template<class Impl> 145void 146LSQ<Impl>::setActiveThreads(list<ThreadID> *at_ptr) 147{ 148 activeThreads = at_ptr; 149 assert(activeThreads != 0); 150} 151 152template <class Impl> 153void 154LSQ<Impl>::drainSanityCheck() const 155{ 156 assert(isDrained()); 157 158 for (ThreadID tid = 0; tid < numThreads; tid++) 159 thread[tid].drainSanityCheck(); 160} 161 162template <class Impl> 163bool 164LSQ<Impl>::isDrained() const 165{ 166 bool drained(true); 167 168 if (!lqEmpty()) { 169 DPRINTF(Drain, "Not drained, LQ not empty.\n"); 170 drained = false; 171 } 172 173 if (!sqEmpty()) { 174 DPRINTF(Drain, "Not drained, SQ not empty.\n"); 175 drained = false; 176 } 177 178 return drained; 179} 180 181template <class Impl> 182void 183LSQ<Impl>::takeOverFrom() 184{ 185 for (ThreadID tid = 0; tid < numThreads; tid++) { 186 thread[tid].takeOverFrom(); 187 } 188} 189 190template <class Impl> 191int 192LSQ<Impl>::entryAmount(ThreadID num_threads) 193{ 194 if (lsqPolicy == Partitioned) { 195 return LQEntries / num_threads; 196 } else { 197 return 0; 198 } 199} 200 201template <class Impl> 202void 203LSQ<Impl>::resetEntries() 204{ 205 if (lsqPolicy != Dynamic || numThreads > 1) { 206 int active_threads = activeThreads->size(); 207 208 int maxEntries; 209 210 if (lsqPolicy == Partitioned) { 211 maxEntries = LQEntries / active_threads; 212 } else if (lsqPolicy == Threshold && active_threads == 1) { 213 maxEntries = LQEntries; 214 } else { 215 maxEntries = LQEntries; 216 } 217 218 list<ThreadID>::iterator threads = activeThreads->begin(); 219 list<ThreadID>::iterator end = activeThreads->end(); 220 221 while (threads != end) { 222 ThreadID tid = *threads++; 223 224 resizeEntries(maxEntries, tid); 225 } 226 } 227} 228 229template<class Impl> 230void 231LSQ<Impl>::removeEntries(ThreadID tid) 232{ 233 thread[tid].clearLQ(); 234 thread[tid].clearSQ(); 235} 236 237template<class Impl> 238void 239LSQ<Impl>::resizeEntries(unsigned size, ThreadID tid) 240{ 241 thread[tid].resizeLQ(size); 242 thread[tid].resizeSQ(size); 243} 244 245template<class Impl> 246void 247LSQ<Impl>::tick() 248{ 249 list<ThreadID>::iterator threads = activeThreads->begin(); 250 list<ThreadID>::iterator end = activeThreads->end(); 251 252 while (threads != end) { 253 ThreadID tid = *threads++; 254 255 thread[tid].tick(); 256 } 257} 258 259template<class Impl> 260void 261LSQ<Impl>::insertLoad(const DynInstPtr &load_inst) 262{ 263 ThreadID tid = load_inst->threadNumber; 264 265 thread[tid].insertLoad(load_inst); 266} 267 268template<class Impl> 269void 270LSQ<Impl>::insertStore(const DynInstPtr &store_inst) 271{ 272 ThreadID tid = store_inst->threadNumber; 273 274 thread[tid].insertStore(store_inst); 275} 276 277template<class Impl> 278Fault 279LSQ<Impl>::executeLoad(const DynInstPtr &inst) 280{ 281 ThreadID tid = inst->threadNumber; 282 283 return thread[tid].executeLoad(inst); 284} 285 286template<class Impl> 287Fault 288LSQ<Impl>::executeStore(const DynInstPtr &inst) 289{ 290 ThreadID tid = inst->threadNumber; 291 292 return thread[tid].executeStore(inst); 293} 294 295template<class Impl> 296void 297LSQ<Impl>::writebackStores() 298{ 299 list<ThreadID>::iterator threads = activeThreads->begin(); 300 list<ThreadID>::iterator end = activeThreads->end(); 301 302 while (threads != end) { 303 ThreadID tid = *threads++; 304 305 if (numStoresToWB(tid) > 0) { 306 DPRINTF(Writeback,"[tid:%i] Writing back stores. %i stores " 307 "available for Writeback.\n", tid, numStoresToWB(tid)); 308 } 309 310 thread[tid].writebackStores(); 311 } 312} 313 314template<class Impl> 315bool 316LSQ<Impl>::violation() 317{ 318 /* Answers: Does Anybody Have a Violation?*/ 319 list<ThreadID>::iterator threads = activeThreads->begin(); 320 list<ThreadID>::iterator end = activeThreads->end(); 321 322 while (threads != end) { 323 ThreadID tid = *threads++; 324 325 if (thread[tid].violation()) 326 return true; 327 } 328 329 return false; 330} 331 332template <class Impl> 333void 334LSQ<Impl>::recvReqRetry() 335{ 336 iewStage->cacheUnblocked(); 337 338 for (ThreadID tid : *activeThreads) { 339 thread[tid].recvRetry(); 340 } 341} 342 343template <class Impl> 344bool 345LSQ<Impl>::recvTimingResp(PacketPtr pkt) 346{ 347 if (pkt->isError()) 348 DPRINTF(LSQ, "Got error packet back for address: %#X\n", 349 pkt->getAddr()); 350 351 thread[cpu->contextToThread(pkt->req->contextId())] 352 .completeDataAccess(pkt); 353 354 if (pkt->isInvalidate()) { 355 // This response also contains an invalidate; e.g. this can be the case 356 // if cmd is ReadRespWithInvalidate. 357 // 358 // The calling order between completeDataAccess and checkSnoop matters. 359 // By calling checkSnoop after completeDataAccess, we ensure that the 360 // fault set by checkSnoop is not lost. Calling writeback (more 361 // specifically inst->completeAcc) in completeDataAccess overwrites 362 // fault, and in case this instruction requires squashing (as 363 // determined by checkSnoop), the ReExec fault set by checkSnoop would 364 // be lost otherwise. 365 366 DPRINTF(LSQ, "received invalidation with response for addr:%#x\n", 367 pkt->getAddr()); 368 369 for (ThreadID tid = 0; tid < numThreads; tid++) { 370 thread[tid].checkSnoop(pkt); 371 } 372 } 373 374 delete pkt; 375 return true; 376} 377 378template <class Impl> 379void 380LSQ<Impl>::recvTimingSnoopReq(PacketPtr pkt) 381{ 382 DPRINTF(LSQ, "received pkt for addr:%#x %s\n", pkt->getAddr(), 383 pkt->cmdString()); 384 385 // must be a snoop 386 if (pkt->isInvalidate()) { 387 DPRINTF(LSQ, "received invalidation for addr:%#x\n", 388 pkt->getAddr()); 389 for (ThreadID tid = 0; tid < numThreads; tid++) { 390 thread[tid].checkSnoop(pkt); 391 } 392 } 393} 394 395template<class Impl> 396int 397LSQ<Impl>::getCount() 398{ 399 unsigned total = 0; 400 401 list<ThreadID>::iterator threads = activeThreads->begin(); 402 list<ThreadID>::iterator end = activeThreads->end(); 403 404 while (threads != end) { 405 ThreadID tid = *threads++; 406 407 total += getCount(tid); 408 } 409 410 return total; 411} 412 413template<class Impl> 414int 415LSQ<Impl>::numLoads() 416{ 417 unsigned total = 0; 418 419 list<ThreadID>::iterator threads = activeThreads->begin(); 420 list<ThreadID>::iterator end = activeThreads->end(); 421 422 while (threads != end) { 423 ThreadID tid = *threads++; 424 425 total += numLoads(tid); 426 } 427 428 return total; 429} 430 431template<class Impl> 432int 433LSQ<Impl>::numStores() 434{ 435 unsigned total = 0; 436 437 list<ThreadID>::iterator threads = activeThreads->begin(); 438 list<ThreadID>::iterator end = activeThreads->end(); 439 440 while (threads != end) { 441 ThreadID tid = *threads++; 442 443 total += thread[tid].numStores(); 444 } 445 446 return total; 447} 448 449template<class Impl> 450unsigned 451LSQ<Impl>::numFreeLoadEntries() 452{ 453 unsigned total = 0; 454 455 list<ThreadID>::iterator threads = activeThreads->begin(); 456 list<ThreadID>::iterator end = activeThreads->end(); 457 458 while (threads != end) { 459 ThreadID tid = *threads++; 460 461 total += thread[tid].numFreeLoadEntries(); 462 } 463 464 return total; 465} 466 467template<class Impl> 468unsigned 469LSQ<Impl>::numFreeStoreEntries() 470{ 471 unsigned total = 0; 472 473 list<ThreadID>::iterator threads = activeThreads->begin(); 474 list<ThreadID>::iterator end = activeThreads->end(); 475 476 while (threads != end) { 477 ThreadID tid = *threads++; 478 479 total += thread[tid].numFreeStoreEntries(); 480 } 481 482 return total; 483} 484 485template<class Impl> 486unsigned 487LSQ<Impl>::numFreeLoadEntries(ThreadID tid) 488{ 489 return thread[tid].numFreeLoadEntries(); 490} 491 492template<class Impl> 493unsigned 494LSQ<Impl>::numFreeStoreEntries(ThreadID tid) 495{ 496 return thread[tid].numFreeStoreEntries(); 497} 498 499template<class Impl> 500bool 501LSQ<Impl>::isFull() 502{ 503 list<ThreadID>::iterator threads = activeThreads->begin(); 504 list<ThreadID>::iterator end = activeThreads->end(); 505 506 while (threads != end) { 507 ThreadID tid = *threads++; 508 509 if (!(thread[tid].lqFull() || thread[tid].sqFull())) 510 return false; 511 } 512 513 return true; 514} 515 516template<class Impl> 517bool 518LSQ<Impl>::isFull(ThreadID tid) 519{ 520 //@todo: Change to Calculate All Entries for 521 //Dynamic Policy 522 if (lsqPolicy == Dynamic) 523 return isFull(); 524 else 525 return thread[tid].lqFull() || thread[tid].sqFull(); 526} 527 528template<class Impl> 529bool 530LSQ<Impl>::isEmpty() const 531{ 532 return lqEmpty() && sqEmpty(); 533} 534 535template<class Impl> 536bool 537LSQ<Impl>::lqEmpty() const 538{ 539 list<ThreadID>::const_iterator threads = activeThreads->begin(); 540 list<ThreadID>::const_iterator end = activeThreads->end(); 541 542 while (threads != end) { 543 ThreadID tid = *threads++; 544 545 if (!thread[tid].lqEmpty()) 546 return false; 547 } 548 549 return true; 550} 551 552template<class Impl> 553bool 554LSQ<Impl>::sqEmpty() const 555{ 556 list<ThreadID>::const_iterator threads = activeThreads->begin(); 557 list<ThreadID>::const_iterator end = activeThreads->end(); 558 559 while (threads != end) { 560 ThreadID tid = *threads++; 561 562 if (!thread[tid].sqEmpty()) 563 return false; 564 } 565 566 return true; 567} 568 569template<class Impl> 570bool 571LSQ<Impl>::lqFull() 572{ 573 list<ThreadID>::iterator threads = activeThreads->begin(); 574 list<ThreadID>::iterator end = activeThreads->end(); 575 576 while (threads != end) { 577 ThreadID tid = *threads++; 578 579 if (!thread[tid].lqFull()) 580 return false; 581 } 582 583 return true; 584} 585 586template<class Impl> 587bool 588LSQ<Impl>::lqFull(ThreadID tid) 589{ 590 //@todo: Change to Calculate All Entries for 591 //Dynamic Policy 592 if (lsqPolicy == Dynamic) 593 return lqFull(); 594 else 595 return thread[tid].lqFull(); 596} 597 598template<class Impl> 599bool 600LSQ<Impl>::sqFull() 601{ 602 list<ThreadID>::iterator threads = activeThreads->begin(); 603 list<ThreadID>::iterator end = activeThreads->end(); 604 605 while (threads != end) { 606 ThreadID tid = *threads++; 607 608 if (!sqFull(tid)) 609 return false; 610 } 611 612 return true; 613} 614 615template<class Impl> 616bool 617LSQ<Impl>::sqFull(ThreadID tid) 618{ 619 //@todo: Change to Calculate All Entries for 620 //Dynamic Policy 621 if (lsqPolicy == Dynamic) 622 return sqFull(); 623 else 624 return thread[tid].sqFull(); 625} 626 627template<class Impl> 628bool 629LSQ<Impl>::isStalled() 630{ 631 list<ThreadID>::iterator threads = activeThreads->begin(); 632 list<ThreadID>::iterator end = activeThreads->end(); 633 634 while (threads != end) { 635 ThreadID tid = *threads++; 636 637 if (!thread[tid].isStalled()) 638 return false; 639 } 640 641 return true; 642} 643 644template<class Impl> 645bool 646LSQ<Impl>::isStalled(ThreadID tid) 647{ 648 if (lsqPolicy == Dynamic) 649 return isStalled(); 650 else 651 return thread[tid].isStalled(); 652} 653 654template<class Impl> 655bool 656LSQ<Impl>::hasStoresToWB() 657{ 658 list<ThreadID>::iterator threads = activeThreads->begin(); 659 list<ThreadID>::iterator end = activeThreads->end(); 660 661 while (threads != end) { 662 ThreadID tid = *threads++; 663 664 if (hasStoresToWB(tid)) 665 return true; 666 } 667 668 return false; 669} 670 671template<class Impl> 672bool 673LSQ<Impl>::willWB() 674{ 675 list<ThreadID>::iterator threads = activeThreads->begin(); 676 list<ThreadID>::iterator end = activeThreads->end(); 677 678 while (threads != end) { 679 ThreadID tid = *threads++; 680 681 if (willWB(tid)) 682 return true; 683 } 684 685 return false; 686} 687 688template<class Impl> 689void 690LSQ<Impl>::dumpInsts() const 691{ 692 list<ThreadID>::const_iterator threads = activeThreads->begin(); 693 list<ThreadID>::const_iterator end = activeThreads->end(); 694 695 while (threads != end) { 696 ThreadID tid = *threads++; 697 698 thread[tid].dumpInsts(); 699 } 700} 701 702#endif//__CPU_O3_LSQ_IMPL_HH__ 703