mshr.cc (9724:7c7ed0cae353) | mshr.cc (9725:0d4ee33078bb) |
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1/* 2 * Copyright (c) 2012 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 --- 47 unchanged lines hidden (view full) --- 56#include "base/types.hh" 57#include "debug/Cache.hh" 58#include "mem/cache/cache.hh" 59#include "mem/cache/mshr.hh" 60#include "sim/core.hh" 61 62using namespace std; 63 | 1/* 2 * Copyright (c) 2012 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 --- 47 unchanged lines hidden (view full) --- 56#include "base/types.hh" 57#include "debug/Cache.hh" 58#include "mem/cache/cache.hh" 59#include "mem/cache/mshr.hh" 60#include "sim/core.hh" 61 62using namespace std; 63 |
64MSHR::MSHR() | 64MSHR::MSHR() : readyTime(0), _isUncacheable(false), downstreamPending(false), 65 pendingDirty(false), postInvalidate(false), 66 postDowngrade(false), queue(NULL), order(0), addr(0), size(0), 67 inService(false), isForward(false), threadNum(InvalidThreadID), 68 data(NULL) |
65{ | 69{ |
66 inService = false; 67 ntargets = 0; 68 threadNum = InvalidThreadID; 69 targets = new TargetList(); 70 deferredTargets = new TargetList(); | |
71} 72 73 74MSHR::TargetList::TargetList() 75 : needsExclusive(false), hasUpgrade(false) 76{} 77 78 --- 131 unchanged lines hidden (view full) --- 210 readyTime = whenReady; 211 order = _order; 212 assert(target); 213 isForward = false; 214 _isUncacheable = target->req->isUncacheable(); 215 inService = false; 216 downstreamPending = false; 217 threadNum = 0; | 70} 71 72 73MSHR::TargetList::TargetList() 74 : needsExclusive(false), hasUpgrade(false) 75{} 76 77 --- 131 unchanged lines hidden (view full) --- 209 readyTime = whenReady; 210 order = _order; 211 assert(target); 212 isForward = false; 213 _isUncacheable = target->req->isUncacheable(); 214 inService = false; 215 downstreamPending = false; 216 threadNum = 0; |
218 ntargets = 1; 219 assert(targets->isReset()); | 217 assert(targets.isReset()); |
220 // Don't know of a case where we would allocate a new MSHR for a 221 // snoop (mem-side request), so set source according to request here 222 Target::Source source = (target->cmd == MemCmd::HardPFReq) ? 223 Target::FromPrefetcher : Target::FromCPU; | 218 // Don't know of a case where we would allocate a new MSHR for a 219 // snoop (mem-side request), so set source according to request here 220 Target::Source source = (target->cmd == MemCmd::HardPFReq) ? 221 Target::FromPrefetcher : Target::FromCPU; |
224 targets->add(target, whenReady, _order, source, true); 225 assert(deferredTargets->isReset()); | 222 targets.add(target, whenReady, _order, source, true); 223 assert(deferredTargets.isReset()); |
226 data = NULL; 227} 228 229 230void 231MSHR::clearDownstreamPending() 232{ 233 assert(downstreamPending); 234 downstreamPending = false; 235 // recursively clear flag on any MSHRs we will be forwarding 236 // responses to | 224 data = NULL; 225} 226 227 228void 229MSHR::clearDownstreamPending() 230{ 231 assert(downstreamPending); 232 downstreamPending = false; 233 // recursively clear flag on any MSHRs we will be forwarding 234 // responses to |
237 targets->clearDownstreamPending(); | 235 targets.clearDownstreamPending(); |
238} 239 240bool 241MSHR::markInService(PacketPtr pkt) 242{ 243 assert(!inService); 244 if (isForwardNoResponse()) { 245 // we just forwarded the request packet & don't expect a 246 // response, so get rid of it 247 assert(getNumTargets() == 1); 248 popTarget(); 249 return true; 250 } 251 inService = true; | 236} 237 238bool 239MSHR::markInService(PacketPtr pkt) 240{ 241 assert(!inService); 242 if (isForwardNoResponse()) { 243 // we just forwarded the request packet & don't expect a 244 // response, so get rid of it 245 assert(getNumTargets() == 1); 246 popTarget(); 247 return true; 248 } 249 inService = true; |
252 pendingDirty = (targets->needsExclusive || | 250 pendingDirty = (targets.needsExclusive || |
253 (!pkt->sharedAsserted() && pkt->memInhibitAsserted())); 254 postInvalidate = postDowngrade = false; 255 256 if (!downstreamPending) { 257 // let upstream caches know that the request has made it to a 258 // level where it's going to get a response | 251 (!pkt->sharedAsserted() && pkt->memInhibitAsserted())); 252 postInvalidate = postDowngrade = false; 253 254 if (!downstreamPending) { 255 // let upstream caches know that the request has made it to a 256 // level where it's going to get a response |
259 targets->clearDownstreamPending(); | 257 targets.clearDownstreamPending(); |
260 } 261 return false; 262} 263 264 265void 266MSHR::deallocate() 267{ | 258 } 259 return false; 260} 261 262 263void 264MSHR::deallocate() 265{ |
268 assert(targets->empty()); 269 targets->resetFlags(); 270 assert(deferredTargets->isReset()); 271 assert(ntargets == 0); | 266 assert(targets.empty()); 267 targets.resetFlags(); 268 assert(deferredTargets.isReset()); |
272 inService = false; 273} 274 275/* 276 * Adds a target to an MSHR 277 */ 278void 279MSHR::allocateTarget(PacketPtr pkt, Tick whenReady, Counter _order) --- 9 unchanged lines hidden (view full) --- 289 // another read request that will downgrade our exclusive block 290 // to shared 291 292 // assume we'd never issue a prefetch when we've got an 293 // outstanding miss 294 assert(pkt->cmd != MemCmd::HardPFReq); 295 296 if (inService && | 269 inService = false; 270} 271 272/* 273 * Adds a target to an MSHR 274 */ 275void 276MSHR::allocateTarget(PacketPtr pkt, Tick whenReady, Counter _order) --- 9 unchanged lines hidden (view full) --- 286 // another read request that will downgrade our exclusive block 287 // to shared 288 289 // assume we'd never issue a prefetch when we've got an 290 // outstanding miss 291 assert(pkt->cmd != MemCmd::HardPFReq); 292 293 if (inService && |
297 (!deferredTargets->empty() || hasPostInvalidate() || | 294 (!deferredTargets.empty() || hasPostInvalidate() || |
298 (pkt->needsExclusive() && 299 (!isPendingDirty() || hasPostDowngrade() || isForward)))) { 300 // need to put on deferred list 301 if (hasPostInvalidate()) 302 replaceUpgrade(pkt); | 295 (pkt->needsExclusive() && 296 (!isPendingDirty() || hasPostDowngrade() || isForward)))) { 297 // need to put on deferred list 298 if (hasPostInvalidate()) 299 replaceUpgrade(pkt); |
303 deferredTargets->add(pkt, whenReady, _order, Target::FromCPU, true); | 300 deferredTargets.add(pkt, whenReady, _order, Target::FromCPU, true); |
304 } else { 305 // No request outstanding, or still OK to append to 306 // outstanding request: append to regular target list. Only 307 // mark pending if current request hasn't been issued yet 308 // (isn't in service). | 301 } else { 302 // No request outstanding, or still OK to append to 303 // outstanding request: append to regular target list. Only 304 // mark pending if current request hasn't been issued yet 305 // (isn't in service). |
309 targets->add(pkt, whenReady, _order, Target::FromCPU, !inService); | 306 targets.add(pkt, whenReady, _order, Target::FromCPU, !inService); |
310 } | 307 } |
311 312 ++ntargets; | |
313} 314 315bool 316MSHR::handleSnoop(PacketPtr pkt, Counter _order) 317{ 318 DPRINTF(Cache, "%s for %s address %x size %d\n", __func__, 319 pkt->cmdString(), pkt->getAddr(), pkt->getSize()); 320 if (!inService || (pkt->isExpressSnoop() && downstreamPending)) { --- 6 unchanged lines hidden (view full) --- 327 // that if we're an L2+ cache buffering an UpgradeReq from a 328 // higher-level cache, and the snoop is invalidating, then our 329 // buffered upgrades must be converted to read exclusives, 330 // since the upper-level cache no longer has a valid copy. 331 // That is, even though the upper-level cache got out on its 332 // local bus first, some other invalidating transaction 333 // reached the global bus before the upgrade did. 334 if (pkt->needsExclusive()) { | 308} 309 310bool 311MSHR::handleSnoop(PacketPtr pkt, Counter _order) 312{ 313 DPRINTF(Cache, "%s for %s address %x size %d\n", __func__, 314 pkt->cmdString(), pkt->getAddr(), pkt->getSize()); 315 if (!inService || (pkt->isExpressSnoop() && downstreamPending)) { --- 6 unchanged lines hidden (view full) --- 322 // that if we're an L2+ cache buffering an UpgradeReq from a 323 // higher-level cache, and the snoop is invalidating, then our 324 // buffered upgrades must be converted to read exclusives, 325 // since the upper-level cache no longer has a valid copy. 326 // That is, even though the upper-level cache got out on its 327 // local bus first, some other invalidating transaction 328 // reached the global bus before the upgrade did. 329 if (pkt->needsExclusive()) { |
335 targets->replaceUpgrades(); 336 deferredTargets->replaceUpgrades(); | 330 targets.replaceUpgrades(); 331 deferredTargets.replaceUpgrades(); |
337 } 338 339 return false; 340 } 341 342 // From here on down, the request issued by this MSHR logically 343 // precedes the request we're snooping. 344 if (pkt->needsExclusive()) { 345 // snooped request still precedes the re-request we'll have to 346 // issue for deferred targets, if any... | 332 } 333 334 return false; 335 } 336 337 // From here on down, the request issued by this MSHR logically 338 // precedes the request we're snooping. 339 if (pkt->needsExclusive()) { 340 // snooped request still precedes the re-request we'll have to 341 // issue for deferred targets, if any... |
347 deferredTargets->replaceUpgrades(); | 342 deferredTargets.replaceUpgrades(); |
348 } 349 350 if (hasPostInvalidate()) { 351 // a prior snoop has already appended an invalidation, so 352 // logically we don't have the block anymore; no need for 353 // further snooping. 354 return true; 355 } --- 4 unchanged lines hidden (view full) --- 360 // and we need to respond after we receive data. 361 // 2. It's an invalidation (e.g., UpgradeReq), and we need 362 // to forward the snoop up the hierarchy after the current 363 // transaction completes. 364 365 // Actual target device (typ. a memory) will delete the 366 // packet on reception, so we need to save a copy here. 367 PacketPtr cp_pkt = new Packet(pkt, true); | 343 } 344 345 if (hasPostInvalidate()) { 346 // a prior snoop has already appended an invalidation, so 347 // logically we don't have the block anymore; no need for 348 // further snooping. 349 return true; 350 } --- 4 unchanged lines hidden (view full) --- 355 // and we need to respond after we receive data. 356 // 2. It's an invalidation (e.g., UpgradeReq), and we need 357 // to forward the snoop up the hierarchy after the current 358 // transaction completes. 359 360 // Actual target device (typ. a memory) will delete the 361 // packet on reception, so we need to save a copy here. 362 PacketPtr cp_pkt = new Packet(pkt, true); |
368 targets->add(cp_pkt, curTick(), _order, Target::FromSnoop, 369 downstreamPending && targets->needsExclusive); 370 ++ntargets; | 363 targets.add(cp_pkt, curTick(), _order, Target::FromSnoop, 364 downstreamPending && targets.needsExclusive); |
371 372 if (isPendingDirty()) { 373 pkt->assertMemInhibit(); 374 pkt->setSupplyExclusive(); 375 } 376 377 if (pkt->needsExclusive()) { 378 // This transaction will take away our pending copy --- 10 unchanged lines hidden (view full) --- 389 390 return true; 391} 392 393 394bool 395MSHR::promoteDeferredTargets() 396{ | 365 366 if (isPendingDirty()) { 367 pkt->assertMemInhibit(); 368 pkt->setSupplyExclusive(); 369 } 370 371 if (pkt->needsExclusive()) { 372 // This transaction will take away our pending copy --- 10 unchanged lines hidden (view full) --- 383 384 return true; 385} 386 387 388bool 389MSHR::promoteDeferredTargets() 390{ |
397 assert(targets->empty()); 398 if (deferredTargets->empty()) { | 391 assert(targets.empty()); 392 if (deferredTargets.empty()) { |
399 return false; 400 } 401 402 // swap targets & deferredTargets lists | 393 return false; 394 } 395 396 // swap targets & deferredTargets lists |
403 TargetList *tmp = targets; 404 targets = deferredTargets; 405 deferredTargets = tmp; | 397 std::swap(targets, deferredTargets); |
406 | 398 |
407 assert(targets->size() == ntargets); 408 | |
409 // clear deferredTargets flags | 399 // clear deferredTargets flags |
410 deferredTargets->resetFlags(); | 400 deferredTargets.resetFlags(); |
411 | 401 |
412 order = targets->front().order; 413 readyTime = std::max(curTick(), targets->front().readyTime); | 402 order = targets.front().order; 403 readyTime = std::max(curTick(), targets.front().readyTime); |
414 415 return true; 416} 417 418 419void 420MSHR::handleFill(Packet *pkt, CacheBlk *blk) 421{ 422 if (!pkt->sharedAsserted() 423 && !(hasPostInvalidate() || hasPostDowngrade()) | 404 405 return true; 406} 407 408 409void 410MSHR::handleFill(Packet *pkt, CacheBlk *blk) 411{ 412 if (!pkt->sharedAsserted() 413 && !(hasPostInvalidate() || hasPostDowngrade()) |
424 && deferredTargets->needsExclusive) { | 414 && deferredTargets.needsExclusive) { |
425 // We got an exclusive response, but we have deferred targets 426 // which are waiting to request an exclusive copy (not because 427 // of a pending invalidate). This can happen if the original 428 // request was for a read-only (non-exclusive) block, but we 429 // got an exclusive copy anyway because of the E part of the 430 // MOESI/MESI protocol. Since we got the exclusive copy 431 // there's no need to defer the targets, so move them up to 432 // the regular target list. | 415 // We got an exclusive response, but we have deferred targets 416 // which are waiting to request an exclusive copy (not because 417 // of a pending invalidate). This can happen if the original 418 // request was for a read-only (non-exclusive) block, but we 419 // got an exclusive copy anyway because of the E part of the 420 // MOESI/MESI protocol. Since we got the exclusive copy 421 // there's no need to defer the targets, so move them up to 422 // the regular target list. |
433 assert(!targets->needsExclusive); 434 targets->needsExclusive = true; | 423 assert(!targets.needsExclusive); 424 targets.needsExclusive = true; |
435 // if any of the deferred targets were upper-level cache 436 // requests marked downstreamPending, need to clear that 437 assert(!downstreamPending); // not pending here anymore | 425 // if any of the deferred targets were upper-level cache 426 // requests marked downstreamPending, need to clear that 427 assert(!downstreamPending); // not pending here anymore |
438 deferredTargets->clearDownstreamPending(); | 428 deferredTargets.clearDownstreamPending(); |
439 // this clears out deferredTargets too | 429 // this clears out deferredTargets too |
440 targets->splice(targets->end(), *deferredTargets); 441 deferredTargets->resetFlags(); | 430 targets.splice(targets.end(), deferredTargets); 431 deferredTargets.resetFlags(); |
442 } 443} 444 445 446bool 447MSHR::checkFunctional(PacketPtr pkt) 448{ 449 // For printing, we treat the MSHR as a whole as single entity. 450 // For other requests, we iterate over the individual targets 451 // since that's where the actual data lies. 452 if (pkt->isPrint()) { 453 pkt->checkFunctional(this, addr, size, NULL); 454 return false; 455 } else { | 432 } 433} 434 435 436bool 437MSHR::checkFunctional(PacketPtr pkt) 438{ 439 // For printing, we treat the MSHR as a whole as single entity. 440 // For other requests, we iterate over the individual targets 441 // since that's where the actual data lies. 442 if (pkt->isPrint()) { 443 pkt->checkFunctional(this, addr, size, NULL); 444 return false; 445 } else { |
456 return (targets->checkFunctional(pkt) || 457 deferredTargets->checkFunctional(pkt)); | 446 return (targets.checkFunctional(pkt) || 447 deferredTargets.checkFunctional(pkt)); |
458 } 459} 460 461 462void 463MSHR::print(std::ostream &os, int verbosity, const std::string &prefix) const 464{ 465 ccprintf(os, "%s[%x:%x] %s %s %s state: %s %s %s %s %s\n", 466 prefix, addr, addr+size-1, 467 isForward ? "Forward" : "", 468 isForwardNoResponse() ? "ForwNoResp" : "", 469 needsExclusive() ? "Excl" : "", 470 _isUncacheable ? "Unc" : "", 471 inService ? "InSvc" : "", 472 downstreamPending ? "DwnPend" : "", 473 hasPostInvalidate() ? "PostInv" : "", 474 hasPostDowngrade() ? "PostDowngr" : ""); 475 476 ccprintf(os, "%s Targets:\n", prefix); | 448 } 449} 450 451 452void 453MSHR::print(std::ostream &os, int verbosity, const std::string &prefix) const 454{ 455 ccprintf(os, "%s[%x:%x] %s %s %s state: %s %s %s %s %s\n", 456 prefix, addr, addr+size-1, 457 isForward ? "Forward" : "", 458 isForwardNoResponse() ? "ForwNoResp" : "", 459 needsExclusive() ? "Excl" : "", 460 _isUncacheable ? "Unc" : "", 461 inService ? "InSvc" : "", 462 downstreamPending ? "DwnPend" : "", 463 hasPostInvalidate() ? "PostInv" : "", 464 hasPostDowngrade() ? "PostDowngr" : ""); 465 466 ccprintf(os, "%s Targets:\n", prefix); |
477 targets->print(os, verbosity, prefix + " "); 478 if (!deferredTargets->empty()) { | 467 targets.print(os, verbosity, prefix + " "); 468 if (!deferredTargets.empty()) { |
479 ccprintf(os, "%s Deferred Targets:\n", prefix); | 469 ccprintf(os, "%s Deferred Targets:\n", prefix); |
480 deferredTargets->print(os, verbosity, prefix + " "); | 470 deferredTargets.print(os, verbosity, prefix + " "); |
481 } 482} 483 484std::string 485MSHR::print() const 486{ 487 ostringstream str; 488 print(str); 489 return str.str(); 490} | 471 } 472} 473 474std::string 475MSHR::print() const 476{ 477 ostringstream str; 478 print(str); 479 return str.str(); 480} |
491 492MSHR::~MSHR() 493{ 494 delete[] targets; 495 delete[] deferredTargets; 496} | |