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     switch (e_type)
 248     {
 249       case InOrderCPU::ActivateThread:
 250         {
 251             DPRINTF(Resource, "Scheduling Activate Thread Resource Pool Event "
 252                     "for tick %i, [tid:%i].\n", curTick + delay,
 253                     inst->readTid());
 254             ResPoolEvent *res_pool_event =
 255                 new ResPoolEvent(this,
 256                                  e_type,
 257                                  inst,
 258                                  inst->squashingStage,
 259                                  inst->bdelaySeqNum,
 260                                  inst->readTid());
 261             mainEventQueue.schedule(res_pool_event,
 262                                     cpu->nextCycle(curTick + cpu->ticks(delay)));
 263         }
 264         break;
 265
 266       case InOrderCPU::HaltThread:
 267       case InOrderCPU::DeactivateThread:
 268         {
 269
 270             DPRINTF(Resource, "Scheduling Deactivate Thread Resource Pool "
 271                     "Event for tick %i.\n", curTick + delay);
 272             ResPoolEvent *res_pool_event =
 273                 new ResPoolEvent(this,
 274                                  e_type,
 275                                  inst,
 276                                  inst->squashingStage,
 277                                  inst->bdelaySeqNum,
 278                                  tid);
 279
 280             mainEventQueue.schedule(res_pool_event,
 281                                     cpu->nextCycle(curTick + cpu->ticks(delay)));
 282
 283         }
 284         break;
 285
 286       case InOrderCPU::SuspendThread:
 287         {
 288
 289             DPRINTF(Resource, "Scheduling Suspend Thread Resource Pool Event for tick %i.\n",
 290                     cpu->nextCycle(cpu->nextCycle(curTick + cpu->ticks(delay))));
 291             ResPoolEvent *res_pool_event = new ResPoolEvent(this,
 292                                                             e_type,
 293                                                             inst,
 294                                                             inst->squashingStage,
 295                                                             inst->bdelaySeqNum,
 296                                                             tid);
 297
 298             mainEventQueue.schedule(res_pool_event, cpu->nextCycle(cpu->nextCycle(curTick + cpu->ticks(delay))));
 299
 300         }
 301         break;
 302
 303       case ResourcePool::InstGraduated:
 304         {
 305             DPRINTF(Resource, "Scheduling Inst-Graduated Resource Pool "
 306                     "Event for tick %i.\n", curTick + delay);
 307             ResPoolEvent *res_pool_event =
 308                 new ResPoolEvent(this,e_type,
 309                                  inst,
 310                                  inst->squashingStage,
 311                                  inst->seqNum,
 312                                  inst->readTid());
 313             mainEventQueue.schedule(res_pool_event,
 314                                     cpu->nextCycle(curTick + cpu->ticks(delay)));
 315
 316         }
 317         break;
 318
 319       case ResourcePool::SquashAll:
 320         {
 321             DPRINTF(Resource, "Scheduling Squash Resource Pool Event for "
 322                     "tick %i.\n", curTick + delay);
 323             ResPoolEvent *res_pool_event =
 324                 new ResPoolEvent(this,e_type,
 325                                  inst,
 326                                  inst->squashingStage,
 327                                  inst->bdelaySeqNum,
 328                                  inst->readTid());
 329             mainEventQueue.schedule(res_pool_event,
 330                                     cpu->nextCycle(curTick + cpu->ticks(delay)));
 331         }
 332         break;
 333
 334       case InOrderCPU::SquashFromMemStall:
 335         {
 336             DPRINTF(Resource, "Scheduling Squash Due to Memory Stall Resource "
 337                     "Pool Event for tick %i.\n",
 338                     curTick + delay);
 339             ResPoolEvent *res_pool_event =
 340                 new ResPoolEvent(this,e_type,
 341                                  inst,
 342                                  inst->squashingStage,
 343                                  inst->seqNum - 1,
 344                                  inst->readTid());
 345             mainEventQueue.schedule(res_pool_event,
 346                                     cpu->nextCycle(curTick + cpu->ticks(delay)));
 347         }
 348         break;
 349
 350       case ResourcePool::UpdateAfterContextSwitch:
 351         {
 352             DPRINTF(Resource, "Scheduling UpdatePC Resource Pool Event for tick %i.\n",
 353                     curTick + delay);
 354             ResPoolEvent *res_pool_event = new ResPoolEvent(this,e_type,
 355                                                             inst,
 356                                                             inst->squashingStage,
 357                                                             inst->seqNum,
 358                                                             inst->readTid());
 359             mainEventQueue.schedule(res_pool_event, cpu->nextCycle(curTick + cpu->ticks(delay)));
 360
 361         }
 362         break;
 363
 364       default:
 365         DPRINTF(Resource, "Ignoring Unrecognized CPU Event (%s).\n",
 366                 InOrderCPU::eventNames[e_type]);
 367     }
 368 }
 369
 370 void
 371 ResourcePool::unscheduleEvent(int res_idx, DynInstPtr inst)
 372 {
 373     resources[res_idx]->unscheduleEvent(inst);
 374 }
 375
 376 void
 377 ResourcePool::squashAll(DynInstPtr inst, int stage_num,
 378                         InstSeqNum done_seq_num, ThreadID tid)
 379 {
 380     DPRINTF(Resource, "[tid:%i] Broadcasting Squash All Event "
 381             " starting w/stage %i for all instructions above [sn:%i].\n",
 382              tid, stage_num, done_seq_num);
 383
 384     int num_resources = resources.size();
 385
 386     for (int idx = 0; idx < num_resources; idx++) {
 387         resources[idx]->squash(inst, stage_num, done_seq_num, tid);
 388     }
 389 }
 390
 391 void
 392 ResourcePool::squashDueToMemStall(DynInstPtr inst, int stage_num,
 393                              InstSeqNum done_seq_num, ThreadID tid)
 394 {
 395     DPRINTF(Resource, "[tid:%i] Broadcasting SquashDueToMemStall Event"
 396             " starting w/stage %i for all instructions above [sn:%i].\n",
 397             tid, stage_num, done_seq_num);
 398
 399     int num_resources = resources.size();
 400
 401     for (int idx = 0; idx < num_resources; idx++) {
 402         resources[idx]->squashDueToMemStall(inst, stage_num, done_seq_num,
 403                                             tid);
 404     }
 405 }
 406
 407 void
 408 ResourcePool::activateAll(ThreadID tid)
 409 {
 410     bool do_activate = cpu->threadModel != InOrderCPU::SwitchOnCacheMiss ||
 411         cpu->numActiveThreads() < 1 ||
 412         cpu->activeThreadId() == tid;
 413
 414
 415     if (do_activate) {
 416         DPRINTF(Resource, "[tid:%i] Broadcasting Thread Activation to all "
 417                     "resources.\n", tid);
 418
 419         int num_resources = resources.size();
 420
 421         for (int idx = 0; idx < num_resources; idx++) {
 422             resources[idx]->activateThread(tid);
 423         }
 424     } else {
 425         DPRINTF(Resource, "[tid:%i] Ignoring Thread Activation to all "
 426                     "resources.\n", tid);
 427      }
 428 }
 429
 430 void
 431 ResourcePool::deactivateAll(ThreadID tid)
 432 {
 433     DPRINTF(Resource, "[tid:%i] Broadcasting Thread Deactivation to all "
 434             "resources.\n", tid);
 435
 436     int num_resources = resources.size();
 437
 438     for (int idx = 0; idx < num_resources; idx++) {
 439         resources[idx]->deactivateThread(tid);
 440     }
 441 }
 442
 443 void
 444 ResourcePool::suspendAll(ThreadID tid)
 445 {
 446     DPRINTF(Resource, "[tid:%i] Broadcasting Thread Suspension to all resources.\n",
 447             tid);
 448
 449     int num_resources = resources.size();
 450
 451     for (int idx = 0; idx < num_resources; idx++) {
 452         resources[idx]->suspendThread(tid);
 453     }
 454 }
 455
 456 void
 457 ResourcePool::instGraduated(InstSeqNum seq_num, ThreadID tid)
 458 {
 459     DPRINTF(Resource, "[tid:%i] Broadcasting [sn:%i] graduation to all "
 460             "resources.\n", tid, seq_num);
 461
 462     int num_resources = resources.size();
 463
 464     for (int idx = 0; idx < num_resources; idx++) {
 465         resources[idx]->instGraduated(seq_num, tid);
 466     }
 467 }
 468
 469 void
 470 ResourcePool::updateAfterContextSwitch(DynInstPtr inst, ThreadID tid)
 471 {
 472     DPRINTF(Resource, "[tid:%i] Broadcasting Update PC to all resources.\n",
 473             tid);
 474
 475     int num_resources = resources.size();
 476
 477     for (int idx = 0; idx < num_resources; idx++) {
 478         resources[idx]->updateAfterContextSwitch(inst, tid);
 479     }
 480 }
 481
 482 ResourcePool::ResPoolEvent::ResPoolEvent(ResourcePool *_resPool,
 483                                          InOrderCPU::CPUEventType e_type,
 484                                          DynInstPtr _inst,
 485                                          int stage_num,
 486                                          InstSeqNum seq_num,
 487                                          ThreadID _tid)
 488     : Event(CPU_Tick_Pri), resPool(_resPool),
 489       eventType(e_type), inst(_inst), seqNum(seq_num),
 490       stageNum(stage_num), tid(_tid)
 491 { }
 492
 493
 494 void
 495 ResourcePool::ResPoolEvent::process()
 496 {
 497     switch (eventType)
 498     {
 499       case InOrderCPU::ActivateThread:
 500         resPool->activateAll(tid);
 501         break;
 502
 503       case InOrderCPU::DeactivateThread:
 504       case InOrderCPU::HaltThread:
 505         resPool->deactivateAll(tid);
 506         break;
 507
 508       case InOrderCPU::SuspendThread:
 509         resPool->suspendAll(tid);
 510         break;
 511
 512       case ResourcePool::InstGraduated:
 513         resPool->instGraduated(seqNum, tid);
 514         break;
 515
 516       case ResourcePool::SquashAll:
 517         resPool->squashAll(inst, stageNum, seqNum, tid);
 518         break;
 519
 520       case InOrderCPU::SquashFromMemStall:
 521         resPool->squashDueToMemStall(inst, stageNum, seqNum, tid);
 522         break;
 523
 524       case ResourcePool::UpdateAfterContextSwitch:
 525         resPool->updateAfterContextSwitch(inst, tid);
 526         break;
 527
 528       default:
 529         fatal("Unrecognized Event Type");
 530     }
 531
 532     resPool->cpu->cpuEventRemoveList.push(this);
 533 }
 534
 535
 536 const char *
 537 ResourcePool::ResPoolEvent::description()
 538 {
 539     return "Resource Pool event";
 540 }
 541
 542 /** Schedule resource event, regardless of its current state. */
 543 void
 544 ResourcePool::ResPoolEvent::scheduleEvent(int delay)
 545 {
 546     if (squashed())
 547         mainEventQueue.reschedule(this,resPool->cpu->nextCycle(curTick + resPool->cpu->ticks(delay)));
 548     else if (!scheduled())
 549         mainEventQueue.schedule(this, resPool->cpu->nextCycle(curTick + resPool->cpu->ticks(delay)));
 550 }
 551
 552 /** Unschedule resource event, regardless of its current state. */
 553 void
 554 ResourcePool::ResPoolEvent::unscheduleEvent()
 555 {
 556     if (scheduled())
 557         squash();
 558 }