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 void
  95 ResourcePool::init()
  96 {
  97     for (int i=0; i < resources.size(); i++) {
  98         DPRINTF(Resource, "Initializing resource: %s.\n",
  99                 resources[i]->name());
 100
 101         resources[i]->init();
 102     }
 103 }
 104
 105 string
 106 ResourcePool::name()
 107 {
 108     return cpu->name() + ".ResourcePool";
 109 }
 110
 111
 112 void
 113 ResourcePool::regStats()
 114 {
 115     DPRINTF(Resource, "Registering Stats Throughout Resource Pool.\n");
 116
 117     int num_resources = resources.size();
 118
 119     for (int idx = 0; idx < num_resources; idx++) {
 120         resources[idx]->regStats();
 121     }
 122 }
 123
 124 Port *
 125 ResourcePool::getPort(const std::string &if_name, int idx)
 126 {
 127     DPRINTF(Resource, "Binding %s in Resource Pool.\n", if_name);
 128
 129     for (int i = 0; i < memObjects.size(); i++) {
 130         int obj_idx = memObjects[i];
 131         Port *port = resources[obj_idx]->getPort(if_name, idx);
 132         if (port != NULL) {
 133             DPRINTF(Resource, "%s set to resource %s(#%i) in Resource Pool.\n",
 134                     if_name, resources[obj_idx]->name(), obj_idx);
 135             return port;
 136         }
 137     }
 138
 139     return NULL;
 140 }
 141
 142 unsigned
 143 ResourcePool::getPortIdx(const std::string &port_name)
 144 {
 145     DPRINTF(Resource, "Finding Port Idx for %s.\n", port_name);
 146
 147     for (int i = 0; i < memObjects.size(); i++) {
 148         unsigned obj_idx = memObjects[i];
 149         Port *port = resources[obj_idx]->getPort(port_name, obj_idx);
 150         if (port != NULL) {
 151             DPRINTF(Resource, "Returning Port Idx %i for %s.\n", obj_idx,
 152                     port_name);
 153             return obj_idx;
 154         }
 155     }
 156
 157     return 0;
 158 }
 159
 160 unsigned
 161 ResourcePool::getResIdx(const std::string &res_name)
 162 {
 163     DPRINTF(Resource, "Finding Resource Idx for %s.\n", res_name);
 164
 165     int num_resources = resources.size();
 166
 167     for (int idx = 0; idx < num_resources; idx++) {
 168         if (resources[idx]->name() == res_name)
 169             return idx;
 170     }
 171
 172     return 0;
 173 }
 174
 175 ResReqPtr
 176 ResourcePool::request(int res_idx, DynInstPtr inst)
 177 {
 178     //Make Sure This is a valid resource ID
 179     assert(res_idx >= 0 && res_idx < resources.size());
 180
 181     return resources[res_idx]->request(inst);
 182 }
 183
 184 void
 185 ResourcePool::squash(DynInstPtr inst, int res_idx, InstSeqNum done_seq_num,
 186                      ThreadID tid)
 187 {
 188     resources[res_idx]->squash(inst, ThePipeline::NumStages-1, done_seq_num,
 189                                tid);
 190 }
 191
 192 int
 193 ResourcePool::slotsAvail(int res_idx)
 194 {
 195     return resources[res_idx]->slotsAvail();
 196 }
 197
 198 int
 199 ResourcePool::slotsInUse(int res_idx)
 200 {
 201     return resources[res_idx]->slotsInUse();
 202 }
 203
 204 //@todo: split this function and call this version schedulePoolEvent
 205 //       and use this scheduleEvent for scheduling a specific event on
 206 //       a resource
 207 //@todo: For arguments that arent being used in a ResPoolEvent, a dummyParam
 208 //       or some typedef can be used to signify what's important info
 209 //       to the event construction
 210 void
 211 ResourcePool::scheduleEvent(InOrderCPU::CPUEventType e_type, DynInstPtr inst,
 212                             int delay,  int res_idx, ThreadID tid)
 213 {
 214     assert(delay >= 0);
 215
 216     switch (e_type)
 217     {
 218       case InOrderCPU::ActivateThread:
 219         {
 220             DPRINTF(Resource, "Scheduling Activate Thread Resource Pool Event "
 221                     "for tick %i, [tid:%i].\n", curTick + delay,
 222                     inst->readTid());
 223             ResPoolEvent *res_pool_event =
 224                 new ResPoolEvent(this,
 225                                  e_type,
 226                                  inst,
 227                                  inst->squashingStage,
 228                                  inst->bdelaySeqNum,
 229                                  inst->readTid());
 230             mainEventQueue.schedule(res_pool_event,
 231                                     curTick + cpu->ticks(delay));
 232         }
 233         break;
 234
 235       case InOrderCPU::HaltThread:
 236       case InOrderCPU::DeactivateThread:
 237         {
 238
 239             DPRINTF(Resource, "Scheduling Deactivate Thread Resource Pool "
 240                     "Event for tick %i.\n", curTick + delay);
 241             ResPoolEvent *res_pool_event =
 242                 new ResPoolEvent(this,
 243                                  e_type,
 244                                  inst,
 245                                  inst->squashingStage,
 246                                  inst->bdelaySeqNum,
 247                                  tid);
 248
 249             mainEventQueue.schedule(res_pool_event,
 250                                     curTick + cpu->ticks(delay));
 251
 252         }
 253         break;
 254
 255       case InOrderCPU::SuspendThread:
 256         {
 257
 258             DPRINTF(Resource, "Scheduling Suspend Thread Resource Pool Event for tick %i.\n",
 259                     curTick + delay);
 260             ResPoolEvent *res_pool_event = new ResPoolEvent(this,
 261                                                             e_type,
 262                                                             inst,
 263                                                             inst->squashingStage,
 264                                                             inst->bdelaySeqNum,
 265                                                             tid);
 266
 267             mainEventQueue.schedule(res_pool_event, curTick + cpu->ticks(delay));
 268
 269         }
 270         break;
 271
 272       case ResourcePool::InstGraduated:
 273         {
 274             DPRINTF(Resource, "Scheduling Inst-Graduated Resource Pool "
 275                     "Event for tick %i.\n", curTick + delay);
 276             ResPoolEvent *res_pool_event =
 277                 new ResPoolEvent(this,e_type,
 278                                  inst,
 279                                  inst->squashingStage,
 280                                  inst->seqNum,
 281                                  inst->readTid());
 282             mainEventQueue.schedule(res_pool_event,
 283                                     curTick + cpu->ticks(delay));
 284
 285         }
 286         break;
 287
 288       case ResourcePool::SquashAll:
 289         {
 290             DPRINTF(Resource, "Scheduling Squash Resource Pool Event for "
 291                     "tick %i.\n", curTick + delay);
 292             ResPoolEvent *res_pool_event =
 293                 new ResPoolEvent(this,e_type,
 294                                  inst,
 295                                  inst->squashingStage,
 296                                  inst->bdelaySeqNum,
 297                                  inst->readTid());
 298             mainEventQueue.schedule(res_pool_event,
 299                                     curTick + cpu->ticks(delay));
 300         }
 301         break;
 302
 303       case InOrderCPU::SquashFromMemStall:
 304         {
 305             DPRINTF(Resource, "Scheduling Squash Due to Memory Stall Resource "
 306                     "Pool Event for tick %i.\n",
 307                     curTick + delay);
 308             ResPoolEvent *res_pool_event =
 309                 new ResPoolEvent(this,e_type,
 310                                  inst,
 311                                  inst->squashingStage,
 312                                  inst->seqNum - 1,
 313                                  inst->readTid());
 314             mainEventQueue.schedule(res_pool_event,
 315                                     curTick + cpu->ticks(delay));
 316         }
 317         break;
 318
 319       case ResourcePool::UpdateAfterContextSwitch:
 320         {
 321             DPRINTF(Resource, "Scheduling UpdatePC Resource Pool Event for tick %i.\n",
 322                     curTick + delay);
 323             ResPoolEvent *res_pool_event = new ResPoolEvent(this,e_type,
 324                                                             inst,
 325                                                             inst->squashingStage,
 326                                                             inst->seqNum,
 327                                                             inst->readTid());
 328             mainEventQueue.schedule(res_pool_event, curTick + cpu->ticks(delay));
 329
 330         }
 331         break;
 332
 333       default:
 334         DPRINTF(Resource, "Ignoring Unrecognized CPU Event (%s).\n",
 335                 InOrderCPU::eventNames[e_type]);
 336     }
 337 }
 338
 339 void
 340 ResourcePool::unscheduleEvent(int res_idx, DynInstPtr inst)
 341 {
 342     resources[res_idx]->unscheduleEvent(inst);
 343 }
 344
 345 void
 346 ResourcePool::squashAll(DynInstPtr inst, int stage_num,
 347                         InstSeqNum done_seq_num, ThreadID tid)
 348 {
 349     DPRINTF(Resource, "[tid:%i] Broadcasting Squash All Event "
 350             " starting w/stage %i for all instructions above [sn:%i].\n",
 351              tid, stage_num, done_seq_num);
 352
 353     int num_resources = resources.size();
 354
 355     for (int idx = 0; idx < num_resources; idx++) {
 356         resources[idx]->squash(inst, stage_num, done_seq_num, tid);
 357     }
 358 }
 359
 360 void
 361 ResourcePool::squashDueToMemStall(DynInstPtr inst, int stage_num,
 362                              InstSeqNum done_seq_num, ThreadID tid)
 363 {
 364     DPRINTF(Resource, "[tid:%i] Broadcasting SquashDueToMemStall Event"
 365             " starting w/stage %i for all instructions above [sn:%i].\n",
 366             tid, stage_num, done_seq_num);
 367
 368     int num_resources = resources.size();
 369
 370     for (int idx = 0; idx < num_resources; idx++) {
 371         resources[idx]->squashDueToMemStall(inst, stage_num, done_seq_num,
 372                                             tid);
 373     }
 374 }
 375
 376 void
 377 ResourcePool::activateAll(ThreadID tid)
 378 {
 379     bool do_activate = cpu->threadModel != InOrderCPU::SwitchOnCacheMiss ||
 380         cpu->numActiveThreads() < 1 ||
 381         cpu->activeThreadId() == tid;
 382
 383
 384     if (do_activate) {
 385         DPRINTF(Resource, "[tid:%i] Broadcasting Thread Activation to all "
 386                     "resources.\n", tid);
 387
 388         int num_resources = resources.size();
 389
 390         for (int idx = 0; idx < num_resources; idx++) {
 391             resources[idx]->activateThread(tid);
 392         }
 393     } else {
 394         DPRINTF(Resource, "[tid:%i] Ignoring Thread Activation to all "
 395                     "resources.\n", tid);
 396      }
 397 }
 398
 399 void
 400 ResourcePool::deactivateAll(ThreadID tid)
 401 {
 402     DPRINTF(Resource, "[tid:%i] Broadcasting Thread Deactivation to all "
 403             "resources.\n", tid);
 404
 405     int num_resources = resources.size();
 406
 407     for (int idx = 0; idx < num_resources; idx++) {
 408         resources[idx]->deactivateThread(tid);
 409     }
 410 }
 411
 412 void
 413 ResourcePool::suspendAll(ThreadID tid)
 414 {
 415     DPRINTF(Resource, "[tid:%i] Broadcasting Thread Suspension to all resources.\n",
 416             tid);
 417
 418     int num_resources = resources.size();
 419
 420     for (int idx = 0; idx < num_resources; idx++) {
 421         resources[idx]->suspendThread(tid);
 422     }
 423 }
 424
 425 void
 426 ResourcePool::instGraduated(InstSeqNum seq_num, ThreadID tid)
 427 {
 428     DPRINTF(Resource, "[tid:%i] Broadcasting [sn:%i] graduation to all "
 429             "resources.\n", tid, seq_num);
 430
 431     int num_resources = resources.size();
 432
 433     for (int idx = 0; idx < num_resources; idx++) {
 434         resources[idx]->instGraduated(seq_num, tid);
 435     }
 436 }
 437
 438 void
 439 ResourcePool::updateAfterContextSwitch(DynInstPtr inst, ThreadID tid)
 440 {
 441     DPRINTF(Resource, "[tid:%i] Broadcasting Update PC to all resources.\n",
 442             tid);
 443
 444     int num_resources = resources.size();
 445
 446     for (int idx = 0; idx < num_resources; idx++) {
 447         resources[idx]->updateAfterContextSwitch(inst, tid);
 448     }
 449 }
 450
 451 ResourcePool::ResPoolEvent::ResPoolEvent(ResourcePool *_resPool)
 452     : Event((Event::Priority)((unsigned)CPU_Tick_Pri+5)), resPool(_resPool),
 453       eventType((InOrderCPU::CPUEventType) Default)
 454 { }
 455
 456 ResourcePool::ResPoolEvent::ResPoolEvent(ResourcePool *_resPool,
 457                                          InOrderCPU::CPUEventType e_type,
 458                                          DynInstPtr _inst,
 459                                          int stage_num,
 460                                          InstSeqNum seq_num,
 461                                          ThreadID _tid)
 462     : Event(CPU_Tick_Pri), resPool(_resPool),
 463       eventType(e_type), inst(_inst), seqNum(seq_num),
 464       stageNum(stage_num), tid(_tid)
 465 { }
 466
 467
 468 void
 469 ResourcePool::ResPoolEvent::process()
 470 {
 471     switch (eventType)
 472     {
 473       case InOrderCPU::ActivateThread:
 474         resPool->activateAll(tid);
 475         break;
 476
 477       case InOrderCPU::DeactivateThread:
 478       case InOrderCPU::HaltThread:
 479         resPool->deactivateAll(tid);
 480         break;
 481
 482       case InOrderCPU::SuspendThread:
 483         resPool->suspendAll(tid);
 484         break;
 485
 486       case ResourcePool::InstGraduated:
 487         resPool->instGraduated(seqNum, tid);
 488         break;
 489
 490       case ResourcePool::SquashAll:
 491         resPool->squashAll(inst, stageNum, seqNum, tid);
 492         break;
 493
 494       case InOrderCPU::SquashFromMemStall:
 495         resPool->squashDueToMemStall(inst, stageNum, seqNum, tid);
 496         break;
 497
 498       case ResourcePool::UpdateAfterContextSwitch:
 499         resPool->updateAfterContextSwitch(inst, tid);
 500         break;
 501
 502       default:
 503         fatal("Unrecognized Event Type");
 504     }
 505
 506     resPool->cpu->cpuEventRemoveList.push(this);
 507 }
 508
 509
 510 const char *
 511 ResourcePool::ResPoolEvent::description()
 512 {
 513     return "Resource Pool event";
 514 }
 515
 516 /** Schedule resource event, regardless of its current state. */
 517 void
 518 ResourcePool::ResPoolEvent::scheduleEvent(int delay)
 519 {
 520     if (squashed())
 521       mainEventQueue.reschedule(this,curTick + resPool->cpu->ticks(delay));
 522     else if (!scheduled())
 523       mainEventQueue.schedule(this,curTick + resPool->cpu->ticks(delay));
 524 }
 525
 526 /** Unschedule resource event, regardless of its current state. */
 527 void
 528 ResourcePool::ResPoolEvent::unscheduleEvent()
 529 {
 530     if (scheduled())
 531         squash();
 532 }