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 void
 205 ResourcePool::scheduleEvent(InOrderCPU::CPUEventType e_type, DynInstPtr inst,
 206                             int delay,  int res_idx, ThreadID tid)
 207 {
 208     assert(delay >= 0);
 209
 210     switch (e_type)
 211     {
 212       case InOrderCPU::ActivateThread:
 213         {
 214             DPRINTF(Resource, "Scheduling Activate Thread Resource Pool Event "
 215                     "for tick %i, [tid:%i].\n", curTick + delay,
 216                     inst->readTid());
 217             ResPoolEvent *res_pool_event =
 218                 new ResPoolEvent(this,
 219                                  e_type,
 220                                  inst,
 221                                  inst->squashingStage,
 222                                  inst->bdelaySeqNum,
 223                                  inst->readTid());
 224             mainEventQueue.schedule(res_pool_event,
 225                                     curTick + cpu->ticks(delay));
 226         }
 227         break;
 228
 229       case InOrderCPU::DeactivateThread:
 230       case InOrderCPU::DeallocateThread:
 231         {
 232
 233             DPRINTF(Resource, "Scheduling Deactivate Thread Resource Pool "
 234                     "Event for tick %i.\n", curTick + delay);
 235             ResPoolEvent *res_pool_event =
 236                 new ResPoolEvent(this,
 237                                  e_type,
 238                                  inst,
 239                                  inst->squashingStage,
 240                                  inst->bdelaySeqNum,
 241                                  tid);
 242
 243             mainEventQueue.schedule(res_pool_event,
 244                                     curTick + cpu->ticks(delay));
 245
 246         }
 247         break;
 248
 249       case InOrderCPU::SuspendThread:
 250         {
 251
 252             DPRINTF(Resource, "Scheduling Suspend Thread Resource Pool Event for tick %i.\n",
 253                     curTick + delay);
 254             ResPoolEvent *res_pool_event = new ResPoolEvent(this,
 255                                                             e_type,
 256                                                             inst,
 257                                                             inst->squashingStage,
 258                                                             inst->bdelaySeqNum,
 259                                                             tid);
 260
 261             mainEventQueue.schedule(res_pool_event, curTick + cpu->ticks(delay));
 262
 263         }
 264         break;
 265
 266       case ResourcePool::InstGraduated:
 267         {
 268             DPRINTF(Resource, "Scheduling Inst-Graduated Resource Pool "
 269                     "Event for tick %i.\n", curTick + delay);
 270             ResPoolEvent *res_pool_event =
 271                 new ResPoolEvent(this,e_type,
 272                                  inst,
 273                                  inst->squashingStage,
 274                                  inst->seqNum,
 275                                  inst->readTid());
 276             mainEventQueue.schedule(res_pool_event,
 277                                     curTick + cpu->ticks(delay));
 278
 279         }
 280         break;
 281
 282       case ResourcePool::SquashAll:
 283         {
 284             DPRINTF(Resource, "Scheduling Squash Resource Pool Event for "
 285                     "tick %i.\n", curTick + delay);
 286             ResPoolEvent *res_pool_event =
 287                 new ResPoolEvent(this,e_type,
 288                                  inst,
 289                                  inst->squashingStage,
 290                                  inst->bdelaySeqNum,
 291                                  inst->readTid());
 292             mainEventQueue.schedule(res_pool_event,
 293                                     curTick + cpu->ticks(delay));
 294         }
 295         break;
 296
 297       case InOrderCPU::SquashFromMemStall:
 298         {
 299             DPRINTF(Resource, "Scheduling Squash Due to Memory Stall Resource "
 300                     "Pool Event for tick %i.\n",
 301                     curTick + delay);
 302             ResPoolEvent *res_pool_event =
 303                 new ResPoolEvent(this,e_type,
 304                                  inst,
 305                                  inst->squashingStage,
 306                                  inst->seqNum - 1,
 307                                  inst->readTid());
 308             mainEventQueue.schedule(res_pool_event,
 309                                     curTick + cpu->ticks(delay));
 310         }
 311         break;
 312
 313       default:
 314         DPRINTF(Resource, "Ignoring Unrecognized CPU Event (%s).\n",
 315                 InOrderCPU::eventNames[e_type]);
 316     }
 317 }
 318
 319 void
 320 ResourcePool::unscheduleEvent(int res_idx, DynInstPtr inst)
 321 {
 322     resources[res_idx]->unscheduleEvent(inst);
 323 }
 324
 325 void
 326 ResourcePool::squashAll(DynInstPtr inst, int stage_num,
 327                         InstSeqNum done_seq_num, ThreadID tid)
 328 {
 329     DPRINTF(Resource, "[tid:%i] Broadcasting Squash All Event "
 330             " starting w/stage %i for all instructions above [sn:%i].\n",
 331              tid, stage_num, done_seq_num);
 332
 333     int num_resources = resources.size();
 334
 335     for (int idx = 0; idx < num_resources; idx++) {
 336         resources[idx]->squash(inst, stage_num, done_seq_num, tid);
 337     }
 338 }
 339
 340 void
 341 ResourcePool::squashDueToMemStall(DynInstPtr inst, int stage_num,
 342                              InstSeqNum done_seq_num, ThreadID tid)
 343 {
 344     DPRINTF(Resource, "[tid:%i] Broadcasting SquashDueToMemStall Event"
 345             " starting w/stage %i for all instructions above [sn:%i].\n",
 346             tid, stage_num, done_seq_num);
 347
 348     int num_resources = resources.size();
 349
 350     for (int idx = 0; idx < num_resources; idx++) {
 351         resources[idx]->squashDueToMemStall(inst, stage_num, done_seq_num,
 352                                             tid);
 353     }
 354 }
 355
 356 void
 357 ResourcePool::activateAll(ThreadID tid)
 358 {
 359     bool do_activate = cpu->threadModel != InOrderCPU::SwitchOnCacheMiss ||
 360         cpu->numActiveThreads() < 1 ||
 361         cpu->activeThreadId() == tid;
 362
 363
 364     if (do_activate) {
 365         DPRINTF(Resource, "[tid:%i] Broadcasting Thread Activation to all "
 366                     "resources.\n", tid);
 367
 368         int num_resources = resources.size();
 369
 370         for (int idx = 0; idx < num_resources; idx++) {
 371             resources[idx]->activateThread(tid);
 372         }
 373     } else {
 374         DPRINTF(Resource, "[tid:%i] Ignoring Thread Activation to all "
 375                     "resources.\n", tid);
 376      }
 377 }
 378
 379 void
 380 ResourcePool::deactivateAll(ThreadID tid)
 381 {
 382     DPRINTF(Resource, "[tid:%i] Broadcasting Thread Deactivation to all "
 383             "resources.\n", tid);
 384
 385     int num_resources = resources.size();
 386
 387     for (int idx = 0; idx < num_resources; idx++) {
 388         resources[idx]->deactivateThread(tid);
 389     }
 390 }
 391
 392 void
 393 ResourcePool::suspendAll(ThreadID tid)
 394 {
 395     DPRINTF(Resource, "[tid:%i] Broadcasting Thread Suspension to all resources.\n",
 396             tid);
 397
 398     int num_resources = resources.size();
 399
 400     for (int idx = 0; idx < num_resources; idx++) {
 401         resources[idx]->suspendThread(tid);
 402     }
 403 }
 404
 405 void
 406 ResourcePool::instGraduated(InstSeqNum seq_num, ThreadID tid)
 407 {
 408     DPRINTF(Resource, "[tid:%i] Broadcasting [sn:%i] graduation to all "
 409             "resources.\n", tid, seq_num);
 410
 411     int num_resources = resources.size();
 412
 413     for (int idx = 0; idx < num_resources; idx++) {
 414         resources[idx]->instGraduated(seq_num, tid);
 415     }
 416 }
 417
 418 ResourcePool::ResPoolEvent::ResPoolEvent(ResourcePool *_resPool)
 419     : Event((Event::Priority)((unsigned)CPU_Tick_Pri+5)), resPool(_resPool),
 420       eventType((InOrderCPU::CPUEventType) Default)
 421 { }
 422
 423 ResourcePool::ResPoolEvent::ResPoolEvent(ResourcePool *_resPool,
 424                                          InOrderCPU::CPUEventType e_type,
 425                                          DynInstPtr _inst,
 426                                          int stage_num,
 427                                          InstSeqNum seq_num,
 428                                          ThreadID _tid)
 429     : Event(CPU_Tick_Pri), resPool(_resPool),
 430       eventType(e_type), inst(_inst), seqNum(seq_num),
 431       stageNum(stage_num), tid(_tid)
 432 { }
 433
 434
 435 void
 436 ResourcePool::ResPoolEvent::process()
 437 {
 438     switch (eventType)
 439     {
 440       case InOrderCPU::ActivateThread:
 441         resPool->activateAll(tid);
 442         break;
 443
 444       case InOrderCPU::DeactivateThread:
 445       case InOrderCPU::DeallocateThread:
 446         resPool->deactivateAll(tid);
 447         break;
 448
 449       case InOrderCPU::SuspendThread:
 450         resPool->suspendAll(tid);
 451         break;
 452
 453       case ResourcePool::InstGraduated:
 454         resPool->instGraduated(seqNum, tid);
 455         break;
 456
 457       case ResourcePool::SquashAll:
 458         resPool->squashAll(inst, stageNum, seqNum, tid);
 459         break;
 460
 461       case InOrderCPU::SquashFromMemStall:
 462         resPool->squashDueToMemStall(inst, stageNum, seqNum, tid);
 463         break;
 464
 465       default:
 466         fatal("Unrecognized Event Type");
 467     }
 468
 469     resPool->cpu->cpuEventRemoveList.push(this);
 470 }
 471
 472
 473 const char *
 474 ResourcePool::ResPoolEvent::description()
 475 {
 476     return "Resource Pool event";
 477 }
 478
 479 /** Schedule resource event, regardless of its current state. */
 480 void
 481 ResourcePool::ResPoolEvent::scheduleEvent(int delay)
 482 {
 483     if (squashed())
 484       mainEventQueue.reschedule(this,curTick + resPool->cpu->ticks(delay));
 485     else if (!scheduled())
 486       mainEventQueue.schedule(this,curTick + resPool->cpu->ticks(delay));
 487 }
 488
 489 /** Unschedule resource event, regardless of its current state. */
 490 void
 491 ResourcePool::ResPoolEvent::unscheduleEvent()
 492 {
 493     if (scheduled())
 494         squash();
 495 }