src/cpu/inorder/resource_pool.cc

   1 /*
   2  * Copyright (c) 2007 MIPS Technologies, Inc.
   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  * Authors: Korey Sewell
  29  *
  30  */
  31
  32 #include "cpu/inorder/resource_pool.hh"
  33 #include "cpu/inorder/resources/resource_list.hh"
  34
  35 #include <vector>
  36 #include <list>
  37
  38 using namespace std;
  39 using namespace ThePipeline;
  40
  41 ResourcePool::ResourcePool(InOrderCPU *_cpu, ThePipeline::Params *params)
  42     : cpu(_cpu)
  43 {
  44     //@todo: use this function to instantiate the resources in resource pool.
  45     //This will help in the auto-generation of this pipeline model.
  46     //ThePipeline::addResources(resources, memObjects);
  47
  48     // Declare Resource Objects
  49     // name - id - bandwidth - latency - CPU - Parameters
  50     // --------------------------------------------------
  51     resources.push_back(new FetchSeqUnit("Fetch-Seq-Unit", FetchSeq,
  52                                          StageWidth * 2, 0, _cpu, params));
  53
  54     memObjects.push_back(ICache);
  55     resources.push_back(new CacheUnit("icache_port", ICache,
  56                                       StageWidth * MaxThreads, 0, _cpu,
  57                                       params));
  58
  59     resources.push_back(new DecodeUnit("Decode-Unit", Decode,
  60                                        StageWidth, 0, _cpu, params));
  61
  62     resources.push_back(new BranchPredictor("Branch-Predictor", BPred,
  63                                             StageWidth, 0, _cpu, params));
  64
  65     resources.push_back(new InstBuffer("Fetch-Buffer-T0", FetchBuff, 4,
  66                                        0, _cpu, params));
  67
  68     resources.push_back(new UseDefUnit("RegFile-Manager", RegManager,
  69                                        StageWidth * MaxThreads, 0, _cpu,
  70                                        params));
  71
  72     resources.push_back(new AGENUnit("AGEN-Unit", AGEN,
  73                                      StageWidth, 0, _cpu, params));
  74
  75     resources.push_back(new ExecutionUnit("Execution-Unit", ExecUnit,
  76                                           StageWidth, 0, _cpu, params));
  77
  78     resources.push_back(new MultDivUnit("Mult-Div-Unit", MDU, 5, 0, _cpu,
  79                                         params));
  80
  81     memObjects.push_back(DCache);
  82     resources.push_back(new CacheUnit("dcache_port", DCache,
  83                                       StageWidth * MaxThreads, 0, _cpu,
  84                                       params));
  85
  86     resources.push_back(new GraduationUnit("Graduation-Unit", Grad,
  87                                            StageWidth * MaxThreads, 0, _cpu,
  88                                            params));
  89
  90     resources.push_back(new InstBuffer("Fetch-Buffer-T1", FetchBuff2, 4,
  91                                        0, _cpu, params));
  92 }
  93
  94 ResourcePool::~ResourcePool()
  95 {
  96     cout << "Deleting resources ..." << endl;
  97
  98     for (int i=0; i < resources.size(); i++) {
  99         DPRINTF(Resource, "Deleting resource: %s.\n", resources[i]->name());
 100
 101         delete resources[i];
 102     }
 103 }
 104
 105
 106 void
 107 ResourcePool::init()
 108 {
 109     for (int i=0; i < resources.size(); i++) {
 110         DPRINTF(Resource, "Initializing resource: %s.\n",
 111                 resources[i]->name());
 112
 113         resources[i]->init();
 114     }
 115 }
 116
 117 string
 118 ResourcePool::name()
 119 {
 120     return cpu->name() + ".ResourcePool";
 121 }
 122
 123
 124 void
 125 ResourcePool::regStats()
 126 {
 127     DPRINTF(Resource, "Registering Stats Throughout Resource Pool.\n");
 128
 129     int num_resources = resources.size();
 130
 131     for (int idx = 0; idx < num_resources; idx++) {
 132         resources[idx]->regStats();
 133     }
 134 }
 135
 136 Port *
 137 ResourcePool::getPort(const std::string &if_name, int idx)
 138 {
 139     DPRINTF(Resource, "Binding %s in Resource Pool.\n", if_name);
 140
 141     for (int i = 0; i < memObjects.size(); i++) {
 142         int obj_idx = memObjects[i];
 143         Port *port = resources[obj_idx]->getPort(if_name, idx);
 144         if (port != NULL) {
 145             DPRINTF(Resource, "%s set to resource %s(#%i) in Resource Pool.\n",
 146                     if_name, resources[obj_idx]->name(), obj_idx);
 147             return port;
 148         }
 149     }
 150
 151     return NULL;
 152 }
 153
 154 unsigned
 155 ResourcePool::getPortIdx(const std::string &port_name)
 156 {
 157     DPRINTF(Resource, "Finding Port Idx for %s.\n", port_name);
 158
 159     for (int i = 0; i < memObjects.size(); i++) {
 160         unsigned obj_idx = memObjects[i];
 161         Port *port = resources[obj_idx]->getPort(port_name, obj_idx);
 162         if (port != NULL) {
 163             DPRINTF(Resource, "Returning Port Idx %i for %s.\n", obj_idx,
 164                     port_name);
 165             return obj_idx;
 166         }
 167     }
 168
 169     return 0;
 170 }
 171
 172 unsigned
 173 ResourcePool::getResIdx(const std::string &res_name)
 174 {
 175     DPRINTF(Resource, "Finding Resource Idx for %s.\n", res_name);
 176
 177     int num_resources = resources.size();
 178
 179     for (int idx = 0; idx < num_resources; idx++) {
 180         if (resources[idx]->name() == res_name)
 181             return idx;
 182     }
 183
 184     panic("Can't find resource idx for: %s\n", res_name);
 185     return 0;
 186 }
 187
 188 unsigned
 189 ResourcePool::getResIdx(const ThePipeline::ResourceId &res_id)
 190 {
 191     int num_resources = resources.size();
 192
 193     for (int idx = 0; idx < num_resources; idx++) {
 194         if (resources[idx]->getId() == res_id)
 195             return idx;
 196     }
 197
 198     // todo: change return value to int and return a -1 here
 199     //       maybe even have enumerated type
 200     //       panic for now...
 201     panic("Can't find resource idx for: %i\n", res_id);
 202
 203     return 0;
 204 }
 205
 206 ResReqPtr
 207 ResourcePool::request(int res_idx, DynInstPtr inst)
 208 {
 209     //Make Sure This is a valid resource ID
 210     assert(res_idx >= 0 && res_idx < resources.size());
 211
 212     return resources[res_idx]->request(inst);
 213 }
 214
 215 void
 216 ResourcePool::squash(DynInstPtr inst, int res_idx, InstSeqNum done_seq_num,
 217                      ThreadID tid)
 218 {
 219     resources[res_idx]->squash(inst, ThePipeline::NumStages-1, done_seq_num,
 220                                tid);
 221 }
 222
 223 int
 224 ResourcePool::slotsAvail(int res_idx)
 225 {
 226     return resources[res_idx]->slotsAvail();
 227 }
 228
 229 int
 230 ResourcePool::slotsInUse(int res_idx)
 231 {
 232     return resources[res_idx]->slotsInUse();
 233 }
 234
 235 //@todo: split this function and call this version schedulePoolEvent
 236 //       and use this scheduleEvent for scheduling a specific event on
 237 //       a resource
 238 //@todo: For arguments that arent being used in a ResPoolEvent, a dummyParam
 239 //       or some typedef can be used to signify what's important info
 240 //       to the event construction
 241 void
 242 ResourcePool::scheduleEvent(InOrderCPU::CPUEventType e_type, DynInstPtr inst,
 243                             int delay,  int res_idx, ThreadID tid)
 244 {
 245     assert(delay >= 0);
 246
 247     Tick when = cpu->nextCycle(curTick() + cpu->ticks(delay));
 248
 249     switch (e_type)
 250     {
 251       case InOrderCPU::ActivateThread:
 252         {
 253             DPRINTF(Resource, "Scheduling Activate Thread Resource Pool Event "
 254                     "for tick %i, [tid:%i].\n", curTick() + delay,
 255                     inst->readTid());
 256             ResPoolEvent *res_pool_event =
 257                 new ResPoolEvent(this,
 258                                  e_type,
 259                                  inst,
 260                                  inst->squashingStage,
 261                                  inst->bdelaySeqNum,
 262                                  inst->readTid());
 263             cpu->schedule(res_pool_event, when);
 264         }
 265         break;
 266
 267       case InOrderCPU::HaltThread:
 268       case InOrderCPU::DeactivateThread:
 269         {
 270
 271             DPRINTF(Resource, "Scheduling Deactivate Thread Resource Pool "
 272                     "Event for tick %i.\n", curTick() + delay);
 273             ResPoolEvent *res_pool_event =
 274                 new ResPoolEvent(this,
 275                                  e_type,
 276                                  inst,
 277                                  inst->squashingStage,
 278                                  inst->bdelaySeqNum,
 279                                  tid);
 280
 281             cpu->schedule(res_pool_event, when);
 282         }
 283         break;
 284
 285       case InOrderCPU::SuspendThread:
 286         {
 287             // not sure why we add another nextCycle() call here...
 288             Tick sked_tick = cpu->nextCycle(when);
 289
 290             DPRINTF(Resource, "Scheduling Suspend Thread Resource Pool "
 291                     "Event for tick %i.\n", sked_tick);
 292
 293             ResPoolEvent *res_pool_event = new ResPoolEvent(this,
 294                                                             e_type,
 295                                                             inst,
 296                                                             inst->squashingStage,
 297                                                             inst->bdelaySeqNum,
 298                                                             tid);
 299
 300             cpu->schedule(res_pool_event, sked_tick);
 301         }
 302         break;
 303
 304       case ResourcePool::InstGraduated:
 305         {
 306             DPRINTF(Resource, "Scheduling Inst-Graduated Resource Pool "
 307                     "Event for tick %i.\n", curTick() + delay);
 308             ResPoolEvent *res_pool_event =
 309                 new ResPoolEvent(this,e_type,
 310                                  inst,
 311                                  inst->squashingStage,
 312                                  inst->seqNum,
 313                                  inst->readTid());
 314             cpu->schedule(res_pool_event, when);
 315         }
 316         break;
 317
 318       case ResourcePool::SquashAll:
 319         {
 320             DPRINTF(Resource, "Scheduling Squash Resource Pool Event for "
 321                     "tick %i.\n", curTick() + delay);
 322             ResPoolEvent *res_pool_event =
 323                 new ResPoolEvent(this,e_type,
 324                                  inst,
 325                                  inst->squashingStage,
 326                                  inst->bdelaySeqNum,
 327                                  inst->readTid());
 328             cpu->schedule(res_pool_event, when);
 329         }
 330         break;
 331
 332       case InOrderCPU::SquashFromMemStall:
 333         {
 334             DPRINTF(Resource, "Scheduling Squash Due to Memory Stall Resource "
 335                     "Pool Event for tick %i.\n",
 336                     curTick() + delay);
 337             ResPoolEvent *res_pool_event =
 338                 new ResPoolEvent(this,e_type,
 339                                  inst,
 340                                  inst->squashingStage,
 341                                  inst->seqNum - 1,
 342                                  inst->readTid());
 343             cpu->schedule(res_pool_event, when);
 344         }
 345         break;
 346
 347       case ResourcePool::UpdateAfterContextSwitch:
 348         {
 349             DPRINTF(Resource, "Scheduling UpdatePC Resource Pool Event "
 350                     "for tick %i.\n",
 351                     curTick() + delay);
 352             ResPoolEvent *res_pool_event = new ResPoolEvent(this,e_type,
 353                                                             inst,
 354                                                             inst->squashingStage,
 355                                                             inst->seqNum,
 356                                                             inst->readTid());
 357             cpu->schedule(res_pool_event, when);
 358         }
 359         break;
 360
 361       default:
 362         DPRINTF(Resource, "Ignoring Unrecognized CPU Event (%s).\n",
 363                 InOrderCPU::eventNames[e_type]);
 364     }
 365 }
 366
 367 void
 368 ResourcePool::unscheduleEvent(int res_idx, DynInstPtr inst)
 369 {
 370     resources[res_idx]->unscheduleEvent(inst);
 371 }
 372
 373 void
 374 ResourcePool::squashAll(DynInstPtr inst, int stage_num,
 375                         InstSeqNum done_seq_num, ThreadID tid)
 376 {
 377     DPRINTF(Resource, "[tid:%i] Broadcasting Squash All Event "
 378             " starting w/stage %i for all instructions above [sn:%i].\n",
 379              tid, stage_num, done_seq_num);
 380
 381     int num_resources = resources.size();
 382
 383     for (int idx = 0; idx < num_resources; idx++) {
 384         resources[idx]->squash(inst, stage_num, done_seq_num, tid);
 385     }
 386 }
 387
 388 void
 389 ResourcePool::squashDueToMemStall(DynInstPtr inst, int stage_num,
 390                              InstSeqNum done_seq_num, ThreadID tid)
 391 {
 392     DPRINTF(Resource, "[tid:%i] Broadcasting SquashDueToMemStall Event"
 393             " starting w/stage %i for all instructions above [sn:%i].\n",
 394             tid, stage_num, done_seq_num);
 395
 396     int num_resources = resources.size();
 397
 398     for (int idx = 0; idx < num_resources; idx++) {
 399         resources[idx]->squashDueToMemStall(inst, stage_num, done_seq_num,
 400                                             tid);
 401     }
 402 }
 403
 404 void
 405 ResourcePool::activateAll(ThreadID tid)
 406 {
 407     bool do_activate = cpu->threadModel != InOrderCPU::SwitchOnCacheMiss ||
 408         cpu->numActiveThreads() < 1 ||
 409         cpu->activeThreadId() == tid;
 410
 411
 412     if (do_activate) {
 413         DPRINTF(Resource, "[tid:%i] Broadcasting Thread Activation to all "
 414                     "resources.\n", tid);
 415
 416         int num_resources = resources.size();
 417
 418         for (int idx = 0; idx < num_resources; idx++) {
 419             resources[idx]->activateThread(tid);
 420         }
 421     } else {
 422         DPRINTF(Resource, "[tid:%i] Ignoring Thread Activation to all "
 423                     "resources.\n", tid);
 424      }
 425 }
 426
 427 void
 428 ResourcePool::deactivateAll(ThreadID tid)
 429 {
 430     DPRINTF(Resource, "[tid:%i] Broadcasting Thread Deactivation to all "
 431             "resources.\n", tid);
 432
 433     int num_resources = resources.size();
 434
 435     for (int idx = 0; idx < num_resources; idx++) {
 436         resources[idx]->deactivateThread(tid);
 437     }
 438 }
 439
 440 void
 441 ResourcePool::suspendAll(ThreadID tid)
 442 {
 443     DPRINTF(Resource, "[tid:%i] Broadcasting Thread Suspension to all "
 444             "resources.\n", tid);
 445
 446     int num_resources = resources.size();
 447
 448     for (int idx = 0; idx < num_resources; idx++) {
 449         resources[idx]->suspendThread(tid);
 450     }
 451 }
 452
 453 void
 454 ResourcePool::instGraduated(InstSeqNum seq_num, ThreadID tid)
 455 {
 456     DPRINTF(Resource, "[tid:%i] Broadcasting [sn:%i] graduation to all "
 457             "resources.\n", tid, seq_num);
 458
 459     int num_resources = resources.size();
 460
 461     for (int idx = 0; idx < num_resources; idx++) {
 462         resources[idx]->instGraduated(seq_num, tid);
 463     }
 464 }
 465
 466 void
 467 ResourcePool::updateAfterContextSwitch(DynInstPtr inst, ThreadID tid)
 468 {
 469     DPRINTF(Resource, "[tid:%i] Broadcasting Update PC to all resources.\n",
 470             tid);
 471
 472     int num_resources = resources.size();
 473
 474     for (int idx = 0; idx < num_resources; idx++) {
 475         resources[idx]->updateAfterContextSwitch(inst, tid);
 476     }
 477 }
 478
 479 ResourcePool::ResPoolEvent::ResPoolEvent(ResourcePool *_resPool,
 480                                          InOrderCPU::CPUEventType e_type,
 481                                          DynInstPtr _inst,
 482                                          int stage_num,
 483                                          InstSeqNum seq_num,
 484                                          ThreadID _tid)
 485     : Event(CPU_Tick_Pri), resPool(_resPool),
 486       eventType(e_type), inst(_inst), seqNum(seq_num),
 487       stageNum(stage_num), tid(_tid)
 488 { }
 489
 490
 491 void
 492 ResourcePool::ResPoolEvent::process()
 493 {
 494     switch (eventType)
 495     {
 496       case InOrderCPU::ActivateThread:
 497         resPool->activateAll(tid);
 498         break;
 499
 500       case InOrderCPU::DeactivateThread:
 501       case InOrderCPU::HaltThread:
 502         resPool->deactivateAll(tid);
 503         break;
 504
 505       case InOrderCPU::SuspendThread:
 506         resPool->suspendAll(tid);
 507         break;
 508
 509       case ResourcePool::InstGraduated:
 510         resPool->instGraduated(seqNum, tid);
 511         break;
 512
 513       case ResourcePool::SquashAll:
 514         resPool->squashAll(inst, stageNum, seqNum, tid);
 515         break;
 516
 517       case InOrderCPU::SquashFromMemStall:
 518         resPool->squashDueToMemStall(inst, stageNum, seqNum, tid);
 519         break;
 520
 521       case ResourcePool::UpdateAfterContextSwitch:
 522         resPool->updateAfterContextSwitch(inst, tid);
 523         break;
 524
 525       default:
 526         fatal("Unrecognized Event Type");
 527     }
 528
 529     resPool->cpu->cpuEventRemoveList.push(this);
 530 }
 531
 532
 533 const char *
 534 ResourcePool::ResPoolEvent::description()
 535 {
 536     return "Resource Pool event";
 537 }
 538
 539 /** Schedule resource event, regardless of its current state. */
 540 void
 541 ResourcePool::ResPoolEvent::scheduleEvent(int delay)
 542 {
 543     InOrderCPU *cpu = resPool->cpu;
 544     assert(!scheduled() || squashed());
 545     cpu->reschedule(this, cpu->nextCycle(curTick() + cpu->ticks(delay)), true);
 546 }
 547
 548 /** Unschedule resource event, regardless of its current state. */
 549 void
 550 ResourcePool::ResPoolEvent::unscheduleEvent()
 551 {
 552     if (scheduled())
 553         squash();
 554 }