cpu.cc revision 12276
1/* 2 * Copyright (c) 2012-2014, 2017 ARM Limited 3 * All rights reserved 4 * 5 * The license below extends only to copyright in the software and shall 6 * not be construed as granting a license to any other intellectual 7 * property including but not limited to intellectual property relating 8 * to a hardware implementation of the functionality of the software 9 * licensed hereunder. You may use the software subject to the license 10 * terms below provided that you ensure that this notice is replicated 11 * unmodified and in its entirety in all distributions of the software, 12 * modified or unmodified, in source code or in binary form. 13 * 14 * Redistribution and use in source and binary forms, with or without 15 * modification, are permitted provided that the following conditions are 16 * met: redistributions of source code must retain the above copyright 17 * notice, this list of conditions and the following disclaimer; 18 * redistributions in binary form must reproduce the above copyright 19 * notice, this list of conditions and the following disclaimer in the 20 * documentation and/or other materials provided with the distribution; 21 * neither the name of the copyright holders nor the names of its 22 * contributors may be used to endorse or promote products derived from 23 * this software without specific prior written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 26 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 27 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 28 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 29 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 30 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 31 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 32 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 33 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 34 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 35 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 36 * 37 * Authors: Andrew Bardsley 38 */ 39 40#include "cpu/minor/cpu.hh" 41 42#include "arch/utility.hh" 43#include "cpu/minor/dyn_inst.hh" 44#include "cpu/minor/fetch1.hh" 45#include "cpu/minor/pipeline.hh" 46#include "debug/Drain.hh" 47#include "debug/MinorCPU.hh" 48#include "debug/Quiesce.hh" 49 50MinorCPU::MinorCPU(MinorCPUParams *params) : 51 BaseCPU(params), 52 threadPolicy(params->threadPolicy) 53{ 54 /* This is only written for one thread at the moment */ 55 Minor::MinorThread *thread; 56 57 for (ThreadID i = 0; i < numThreads; i++) { 58 if (FullSystem) { 59 thread = new Minor::MinorThread(this, i, params->system, 60 params->itb, params->dtb, params->isa[i]); 61 thread->setStatus(ThreadContext::Halted); 62 } else { 63 thread = new Minor::MinorThread(this, i, params->system, 64 params->workload[i], params->itb, params->dtb, 65 params->isa[i]); 66 } 67 68 threads.push_back(thread); 69 ThreadContext *tc = thread->getTC(); 70 threadContexts.push_back(tc); 71 } 72 73 74 if (params->checker) { 75 fatal("The Minor model doesn't support checking (yet)\n"); 76 } 77 78 Minor::MinorDynInst::init(); 79 80 pipeline = new Minor::Pipeline(*this, *params); 81 activityRecorder = pipeline->getActivityRecorder(); 82} 83 84MinorCPU::~MinorCPU() 85{ 86 delete pipeline; 87 88 for (ThreadID thread_id = 0; thread_id < threads.size(); thread_id++) { 89 delete threads[thread_id]; 90 } 91} 92 93void 94MinorCPU::init() 95{ 96 BaseCPU::init(); 97 98 if (!params()->switched_out && 99 system->getMemoryMode() != Enums::timing) 100 { 101 fatal("The Minor CPU requires the memory system to be in " 102 "'timing' mode.\n"); 103 } 104 105 /* Initialise the ThreadContext's memory proxies */ 106 for (ThreadID thread_id = 0; thread_id < threads.size(); thread_id++) { 107 ThreadContext *tc = getContext(thread_id); 108 109 tc->initMemProxies(tc); 110 } 111 112 /* Initialise CPUs (== threads in the ISA) */ 113 if (FullSystem && !params()->switched_out) { 114 for (ThreadID thread_id = 0; thread_id < threads.size(); thread_id++) 115 { 116 ThreadContext *tc = getContext(thread_id); 117 118 /* Initialize CPU, including PC */ 119 TheISA::initCPU(tc, cpuId()); 120 } 121 } 122} 123 124/** Stats interface from SimObject (by way of BaseCPU) */ 125void 126MinorCPU::regStats() 127{ 128 BaseCPU::regStats(); 129 stats.regStats(name(), *this); 130 pipeline->regStats(); 131} 132 133void 134MinorCPU::serializeThread(CheckpointOut &cp, ThreadID thread_id) const 135{ 136 threads[thread_id]->serialize(cp); 137} 138 139void 140MinorCPU::unserializeThread(CheckpointIn &cp, ThreadID thread_id) 141{ 142 threads[thread_id]->unserialize(cp); 143} 144 145void 146MinorCPU::serialize(CheckpointOut &cp) const 147{ 148 pipeline->serialize(cp); 149 BaseCPU::serialize(cp); 150} 151 152void 153MinorCPU::unserialize(CheckpointIn &cp) 154{ 155 pipeline->unserialize(cp); 156 BaseCPU::unserialize(cp); 157} 158 159Addr 160MinorCPU::dbg_vtophys(Addr addr) 161{ 162 /* Note that this gives you the translation for thread 0 */ 163 panic("No implementation for vtophy\n"); 164 165 return 0; 166} 167 168void 169MinorCPU::wakeup(ThreadID tid) 170{ 171 DPRINTF(Drain, "[tid:%d] MinorCPU wakeup\n", tid); 172 assert(tid < numThreads); 173 174 if (threads[tid]->status() == ThreadContext::Suspended) { 175 threads[tid]->activate(); 176 } 177} 178 179void 180MinorCPU::startup() 181{ 182 DPRINTF(MinorCPU, "MinorCPU startup\n"); 183 184 BaseCPU::startup(); 185 186 for (auto i = threads.begin(); i != threads.end(); i ++) 187 (*i)->startup(); 188 189 for (ThreadID tid = 0; tid < numThreads; tid++) { 190 threads[tid]->startup(); 191 pipeline->wakeupFetch(tid); 192 } 193} 194 195DrainState 196MinorCPU::drain() 197{ 198 // Deschedule any power gating event (if any) 199 deschedulePowerGatingEvent(); 200 201 if (switchedOut()) { 202 DPRINTF(Drain, "Minor CPU switched out, draining not needed.\n"); 203 return DrainState::Drained; 204 } 205 206 DPRINTF(Drain, "MinorCPU drain\n"); 207 208 /* Need to suspend all threads and wait for Execute to idle. 209 * Tell Fetch1 not to fetch */ 210 if (pipeline->drain()) { 211 DPRINTF(Drain, "MinorCPU drained\n"); 212 return DrainState::Drained; 213 } else { 214 DPRINTF(Drain, "MinorCPU not finished draining\n"); 215 return DrainState::Draining; 216 } 217} 218 219void 220MinorCPU::signalDrainDone() 221{ 222 DPRINTF(Drain, "MinorCPU drain done\n"); 223 Drainable::signalDrainDone(); 224} 225 226void 227MinorCPU::drainResume() 228{ 229 /* When taking over from another cpu make sure lastStopped 230 * is reset since it might have not been defined previously 231 * and might lead to a stats corruption */ 232 pipeline->resetLastStopped(); 233 234 if (switchedOut()) { 235 DPRINTF(Drain, "drainResume while switched out. Ignoring\n"); 236 return; 237 } 238 239 DPRINTF(Drain, "MinorCPU drainResume\n"); 240 241 if (!system->isTimingMode()) { 242 fatal("The Minor CPU requires the memory system to be in " 243 "'timing' mode.\n"); 244 } 245 246 for (ThreadID tid = 0; tid < numThreads; tid++){ 247 wakeup(tid); 248 } 249 250 pipeline->drainResume(); 251 252 // Reschedule any power gating event (if any) 253 schedulePowerGatingEvent(); 254} 255 256void 257MinorCPU::memWriteback() 258{ 259 DPRINTF(Drain, "MinorCPU memWriteback\n"); 260} 261 262void 263MinorCPU::switchOut() 264{ 265 DPRINTF(MinorCPU, "MinorCPU switchOut\n"); 266 267 assert(!switchedOut()); 268 BaseCPU::switchOut(); 269 270 /* Check that the CPU is drained? */ 271 activityRecorder->reset(); 272} 273 274void 275MinorCPU::takeOverFrom(BaseCPU *old_cpu) 276{ 277 DPRINTF(MinorCPU, "MinorCPU takeOverFrom\n"); 278 279 BaseCPU::takeOverFrom(old_cpu); 280} 281 282void 283MinorCPU::activateContext(ThreadID thread_id) 284{ 285 DPRINTF(MinorCPU, "ActivateContext thread: %d\n", thread_id); 286 287 /* Do some cycle accounting. lastStopped is reset to stop the 288 * wakeup call on the pipeline from adding the quiesce period 289 * to BaseCPU::numCycles */ 290 stats.quiesceCycles += pipeline->cyclesSinceLastStopped(); 291 pipeline->resetLastStopped(); 292 293 /* Wake up the thread, wakeup the pipeline tick */ 294 threads[thread_id]->activate(); 295 wakeupOnEvent(Minor::Pipeline::CPUStageId); 296 pipeline->wakeupFetch(thread_id); 297 298 BaseCPU::activateContext(thread_id); 299} 300 301void 302MinorCPU::suspendContext(ThreadID thread_id) 303{ 304 DPRINTF(MinorCPU, "SuspendContext %d\n", thread_id); 305 306 threads[thread_id]->suspend(); 307 308 BaseCPU::suspendContext(thread_id); 309} 310 311void 312MinorCPU::wakeupOnEvent(unsigned int stage_id) 313{ 314 DPRINTF(Quiesce, "Event wakeup from stage %d\n", stage_id); 315 316 /* Mark that some activity has taken place and start the pipeline */ 317 activityRecorder->activateStage(stage_id); 318 pipeline->start(); 319} 320 321MinorCPU * 322MinorCPUParams::create() 323{ 324 return new MinorCPU(this); 325} 326 327MasterPort &MinorCPU::getInstPort() 328{ 329 return pipeline->getInstPort(); 330} 331 332MasterPort &MinorCPU::getDataPort() 333{ 334 return pipeline->getDataPort(); 335} 336 337Counter 338MinorCPU::totalInsts() const 339{ 340 Counter ret = 0; 341 342 for (auto i = threads.begin(); i != threads.end(); i ++) 343 ret += (*i)->numInst; 344 345 return ret; 346} 347 348Counter 349MinorCPU::totalOps() const 350{ 351 Counter ret = 0; 352 353 for (auto i = threads.begin(); i != threads.end(); i ++) 354 ret += (*i)->numOp; 355 356 return ret; 357} 358