xbar.cc revision 11522
15703SN/A/* 25703SN/A * Copyright (c) 2011-2015 ARM Limited 35703SN/A * All rights reserved 45703SN/A * 55703SN/A * The license below extends only to copyright in the software and shall 65703SN/A * not be construed as granting a license to any other intellectual 75703SN/A * property including but not limited to intellectual property relating 85703SN/A * to a hardware implementation of the functionality of the software 95703SN/A * licensed hereunder. You may use the software subject to the license 105703SN/A * terms below provided that you ensure that this notice is replicated 115703SN/A * unmodified and in its entirety in all distributions of the software, 125703SN/A * modified or unmodified, in source code or in binary form. 135703SN/A * 145703SN/A * Copyright (c) 2006 The Regents of The University of Michigan 155703SN/A * All rights reserved. 165703SN/A * 175703SN/A * Redistribution and use in source and binary forms, with or without 185703SN/A * modification, are permitted provided that the following conditions are 195703SN/A * met: redistributions of source code must retain the above copyright 205703SN/A * notice, this list of conditions and the following disclaimer; 215703SN/A * redistributions in binary form must reproduce the above copyright 225703SN/A * notice, this list of conditions and the following disclaimer in the 235703SN/A * documentation and/or other materials provided with the distribution; 245703SN/A * neither the name of the copyright holders nor the names of its 255703SN/A * contributors may be used to endorse or promote products derived from 265703SN/A * this software without specific prior written permission. 275703SN/A * 285703SN/A * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 295703SN/A * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 3011680SCurtis.Dunham@arm.com * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 315703SN/A * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 325703SN/A * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 335703SN/A * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 345703SN/A * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 355703SN/A * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 365703SN/A * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 375703SN/A * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 385703SN/A * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 395703SN/A * 405703SN/A * Authors: Ali Saidi 415703SN/A * Andreas Hansson 425703SN/A * William Wang 435703SN/A */ 445703SN/A 455703SN/A/** 465703SN/A * @file 475703SN/A * Definition of a crossbar object. 485703SN/A */ 495703SN/A 505703SN/A#include "base/misc.hh" 515703SN/A#include "base/trace.hh" 525703SN/A#include "debug/AddrRanges.hh" 535703SN/A#include "debug/Drain.hh" 545703SN/A#include "debug/XBar.hh" 555703SN/A#include "mem/xbar.hh" 565703SN/A 575703SN/ABaseXBar::BaseXBar(const BaseXBarParams *p) 585703SN/A : MemObject(p), 595703SN/A frontendLatency(p->frontend_latency), 605703SN/A forwardLatency(p->forward_latency), 615703SN/A responseLatency(p->response_latency), 625703SN/A width(p->width), 635703SN/A gotAddrRanges(p->port_default_connection_count + 645778SN/A p->port_master_connection_count, false), 655703SN/A gotAllAddrRanges(false), defaultPortID(InvalidPortID), 665703SN/A useDefaultRange(p->use_default_range) 675703SN/A{} 685703SN/A 695703SN/ABaseXBar::~BaseXBar() 705703SN/A{ 715703SN/A for (auto m: masterPorts) 725703SN/A delete m; 735703SN/A 745703SN/A for (auto s: slavePorts) 755703SN/A delete s; 765778SN/A} 775703SN/A 785703SN/Avoid 795703SN/ABaseXBar::init() 805703SN/A{ 815703SN/A} 825703SN/A 835703SN/ABaseMasterPort & 845703SN/ABaseXBar::getMasterPort(const std::string &if_name, PortID idx) 855703SN/A{ 865703SN/A if (if_name == "master" && idx < masterPorts.size()) { 875703SN/A // the master port index translates directly to the vector position 885703SN/A return *masterPorts[idx]; 895703SN/A } else if (if_name == "default") { 905703SN/A return *masterPorts[defaultPortID]; 915703SN/A } else { 925703SN/A return MemObject::getMasterPort(if_name, idx); 935703SN/A } 945703SN/A} 955703SN/A 965703SN/ABaseSlavePort & 975703SN/ABaseXBar::getSlavePort(const std::string &if_name, PortID idx) 985703SN/A{ 995703SN/A if (if_name == "slave" && idx < slavePorts.size()) { 1005703SN/A // the slave port index translates directly to the vector position 1015703SN/A return *slavePorts[idx]; 1025703SN/A } else { 1035703SN/A return MemObject::getSlavePort(if_name, idx); 1045703SN/A } 1055703SN/A} 1065703SN/A 1075703SN/Avoid 1085703SN/ABaseXBar::calcPacketTiming(PacketPtr pkt, Tick header_delay) 1095703SN/A{ 1105703SN/A // the crossbar will be called at a time that is not necessarily 1115703SN/A // coinciding with its own clock, so start by determining how long 1125703SN/A // until the next clock edge (could be zero) 1135703SN/A Tick offset = clockEdge() - curTick(); 11411680SCurtis.Dunham@arm.com 11511680SCurtis.Dunham@arm.com // the header delay depends on the path through the crossbar, and 11611680SCurtis.Dunham@arm.com // we therefore rely on the caller to provide the actual 11711680SCurtis.Dunham@arm.com // value 11811680SCurtis.Dunham@arm.com pkt->headerDelay += offset + header_delay; 11911680SCurtis.Dunham@arm.com 12011680SCurtis.Dunham@arm.com // note that we add the header delay to the existing value, and 12111680SCurtis.Dunham@arm.com // align it to the crossbar clock 12211680SCurtis.Dunham@arm.com 12311680SCurtis.Dunham@arm.com // do a quick sanity check to ensure the timings are not being 12411680SCurtis.Dunham@arm.com // ignored, note that this specific value may cause problems for 12511680SCurtis.Dunham@arm.com // slower interconnects 12611680SCurtis.Dunham@arm.com panic_if(pkt->headerDelay > SimClock::Int::us, 12711680SCurtis.Dunham@arm.com "Encountered header delay exceeding 1 us\n"); 12811680SCurtis.Dunham@arm.com 12911680SCurtis.Dunham@arm.com if (pkt->hasData()) { 13011680SCurtis.Dunham@arm.com // the payloadDelay takes into account the relative time to 13111680SCurtis.Dunham@arm.com // deliver the payload of the packet, after the header delay, 13211680SCurtis.Dunham@arm.com // we take the maximum since the payload delay could already 13311680SCurtis.Dunham@arm.com // be longer than what this parcitular crossbar enforces. 13411680SCurtis.Dunham@arm.com pkt->payloadDelay = std::max<Tick>(pkt->payloadDelay, 13511680SCurtis.Dunham@arm.com divCeil(pkt->getSize(), width) * 13611680SCurtis.Dunham@arm.com clockPeriod()); 13711680SCurtis.Dunham@arm.com } 13811680SCurtis.Dunham@arm.com 13911680SCurtis.Dunham@arm.com // the payload delay is not paying for the clock offset as that is 14011680SCurtis.Dunham@arm.com // already done using the header delay, and the payload delay is 14111680SCurtis.Dunham@arm.com // also used to determine how long the crossbar layer is busy and 14211680SCurtis.Dunham@arm.com // thus regulates throughput 14311680SCurtis.Dunham@arm.com} 14411680SCurtis.Dunham@arm.com 14511680SCurtis.Dunham@arm.comtemplate <typename SrcType, typename DstType> 14611680SCurtis.Dunham@arm.comBaseXBar::Layer<SrcType,DstType>::Layer(DstType& _port, BaseXBar& _xbar, 14711680SCurtis.Dunham@arm.com const std::string& _name) : 14811680SCurtis.Dunham@arm.com port(_port), xbar(_xbar), _name(_name), state(IDLE), 14911680SCurtis.Dunham@arm.com waitingForPeer(NULL), releaseEvent(this) 15011680SCurtis.Dunham@arm.com{ 15111680SCurtis.Dunham@arm.com} 15211680SCurtis.Dunham@arm.com 15311680SCurtis.Dunham@arm.comtemplate <typename SrcType, typename DstType> 15411680SCurtis.Dunham@arm.comvoid BaseXBar::Layer<SrcType,DstType>::occupyLayer(Tick until) 15511680SCurtis.Dunham@arm.com{ 15611680SCurtis.Dunham@arm.com // ensure the state is busy at this point, as the layer should 15711680SCurtis.Dunham@arm.com // transition from idle as soon as it has decided to forward the 15811680SCurtis.Dunham@arm.com // packet to prevent any follow-on calls to sendTiming seeing an 15911680SCurtis.Dunham@arm.com // unoccupied layer 16011680SCurtis.Dunham@arm.com assert(state == BUSY); 16111680SCurtis.Dunham@arm.com 16211680SCurtis.Dunham@arm.com // until should never be 0 as express snoops never occupy the layer 16311680SCurtis.Dunham@arm.com assert(until != 0); 16411680SCurtis.Dunham@arm.com xbar.schedule(releaseEvent, until); 16511680SCurtis.Dunham@arm.com 16611680SCurtis.Dunham@arm.com // account for the occupied ticks 16711680SCurtis.Dunham@arm.com occupancy += until - curTick(); 16811680SCurtis.Dunham@arm.com 16911680SCurtis.Dunham@arm.com DPRINTF(BaseXBar, "The crossbar layer is now busy from tick %d to %d\n", 17011680SCurtis.Dunham@arm.com curTick(), until); 17111680SCurtis.Dunham@arm.com} 17211680SCurtis.Dunham@arm.com 17311680SCurtis.Dunham@arm.comtemplate <typename SrcType, typename DstType> 17411680SCurtis.Dunham@arm.combool 17511680SCurtis.Dunham@arm.comBaseXBar::Layer<SrcType,DstType>::tryTiming(SrcType* src_port) 17611680SCurtis.Dunham@arm.com{ 17711680SCurtis.Dunham@arm.com // if we are in the retry state, we will not see anything but the 17811680SCurtis.Dunham@arm.com // retrying port (or in the case of the snoop ports the snoop 17911680SCurtis.Dunham@arm.com // response port that mirrors the actual slave port) as we leave 18011680SCurtis.Dunham@arm.com // this state again in zero time if the peer does not immediately 18111680SCurtis.Dunham@arm.com // call the layer when receiving the retry 18211680SCurtis.Dunham@arm.com 18311680SCurtis.Dunham@arm.com // first we see if the layer is busy, next we check if the 18411680SCurtis.Dunham@arm.com // destination port is already engaged in a transaction waiting 18511680SCurtis.Dunham@arm.com // for a retry from the peer 18611680SCurtis.Dunham@arm.com if (state == BUSY || waitingForPeer != NULL) { 18711680SCurtis.Dunham@arm.com // the port should not be waiting already 18811680SCurtis.Dunham@arm.com assert(std::find(waitingForLayer.begin(), waitingForLayer.end(), 18911680SCurtis.Dunham@arm.com src_port) == waitingForLayer.end()); 19011680SCurtis.Dunham@arm.com 19111680SCurtis.Dunham@arm.com // put the port at the end of the retry list waiting for the 19211680SCurtis.Dunham@arm.com // layer to be freed up (and in the case of a busy peer, for 19311680SCurtis.Dunham@arm.com // that transaction to go through, and then the layer to free 19411680SCurtis.Dunham@arm.com // up) 19511680SCurtis.Dunham@arm.com waitingForLayer.push_back(src_port); 19611680SCurtis.Dunham@arm.com return false; 19711680SCurtis.Dunham@arm.com } 19811680SCurtis.Dunham@arm.com 19911680SCurtis.Dunham@arm.com state = BUSY; 20011680SCurtis.Dunham@arm.com 20111680SCurtis.Dunham@arm.com return true; 20211680SCurtis.Dunham@arm.com} 20311680SCurtis.Dunham@arm.com 20411680SCurtis.Dunham@arm.comtemplate <typename SrcType, typename DstType> 20511680SCurtis.Dunham@arm.comvoid 20611680SCurtis.Dunham@arm.comBaseXBar::Layer<SrcType,DstType>::succeededTiming(Tick busy_time) 20711680SCurtis.Dunham@arm.com{ 20811680SCurtis.Dunham@arm.com // we should have gone from idle or retry to busy in the tryTiming 20911680SCurtis.Dunham@arm.com // test 21011680SCurtis.Dunham@arm.com assert(state == BUSY); 21111680SCurtis.Dunham@arm.com 21211680SCurtis.Dunham@arm.com // occupy the layer accordingly 21311680SCurtis.Dunham@arm.com occupyLayer(busy_time); 21411680SCurtis.Dunham@arm.com} 21511680SCurtis.Dunham@arm.com 21611680SCurtis.Dunham@arm.comtemplate <typename SrcType, typename DstType> 21711680SCurtis.Dunham@arm.comvoid 21811680SCurtis.Dunham@arm.comBaseXBar::Layer<SrcType,DstType>::failedTiming(SrcType* src_port, 21911680SCurtis.Dunham@arm.com Tick busy_time) 22011680SCurtis.Dunham@arm.com{ 22111680SCurtis.Dunham@arm.com // ensure no one got in between and tried to send something to 22211680SCurtis.Dunham@arm.com // this port 22311680SCurtis.Dunham@arm.com assert(waitingForPeer == NULL); 224 225 // if the source port is the current retrying one or not, we have 226 // failed in forwarding and should track that we are now waiting 227 // for the peer to send a retry 228 waitingForPeer = src_port; 229 230 // we should have gone from idle or retry to busy in the tryTiming 231 // test 232 assert(state == BUSY); 233 234 // occupy the bus accordingly 235 occupyLayer(busy_time); 236} 237 238template <typename SrcType, typename DstType> 239void 240BaseXBar::Layer<SrcType,DstType>::releaseLayer() 241{ 242 // releasing the bus means we should now be idle 243 assert(state == BUSY); 244 assert(!releaseEvent.scheduled()); 245 246 // update the state 247 state = IDLE; 248 249 // bus layer is now idle, so if someone is waiting we can retry 250 if (!waitingForLayer.empty()) { 251 // there is no point in sending a retry if someone is still 252 // waiting for the peer 253 if (waitingForPeer == NULL) 254 retryWaiting(); 255 } else if (waitingForPeer == NULL && drainState() == DrainState::Draining) { 256 DPRINTF(Drain, "Crossbar done draining, signaling drain manager\n"); 257 //If we weren't able to drain before, do it now. 258 signalDrainDone(); 259 } 260} 261 262template <typename SrcType, typename DstType> 263void 264BaseXBar::Layer<SrcType,DstType>::retryWaiting() 265{ 266 // this should never be called with no one waiting 267 assert(!waitingForLayer.empty()); 268 269 // we always go to retrying from idle 270 assert(state == IDLE); 271 272 // update the state 273 state = RETRY; 274 275 // set the retrying port to the front of the retry list and pop it 276 // off the list 277 SrcType* retryingPort = waitingForLayer.front(); 278 waitingForLayer.pop_front(); 279 280 // tell the port to retry, which in some cases ends up calling the 281 // layer again 282 sendRetry(retryingPort); 283 284 // If the layer is still in the retry state, sendTiming wasn't 285 // called in zero time (e.g. the cache does this when a writeback 286 // is squashed) 287 if (state == RETRY) { 288 // update the state to busy and reset the retrying port, we 289 // have done our bit and sent the retry 290 state = BUSY; 291 292 // occupy the crossbar layer until the next clock edge 293 occupyLayer(xbar.clockEdge()); 294 } 295} 296 297template <typename SrcType, typename DstType> 298void 299BaseXBar::Layer<SrcType,DstType>::recvRetry() 300{ 301 // we should never get a retry without having failed to forward 302 // something to this port 303 assert(waitingForPeer != NULL); 304 305 // add the port where the failed packet originated to the front of 306 // the waiting ports for the layer, this allows us to call retry 307 // on the port immediately if the crossbar layer is idle 308 waitingForLayer.push_front(waitingForPeer); 309 310 // we are no longer waiting for the peer 311 waitingForPeer = NULL; 312 313 // if the layer is idle, retry this port straight away, if we 314 // are busy, then simply let the port wait for its turn 315 if (state == IDLE) { 316 retryWaiting(); 317 } else { 318 assert(state == BUSY); 319 } 320} 321 322PortID 323BaseXBar::findPort(Addr addr) 324{ 325 // we should never see any address lookups before we've got the 326 // ranges of all connected slave modules 327 assert(gotAllAddrRanges); 328 329 // Check the cache 330 PortID dest_id = checkPortCache(addr); 331 if (dest_id != InvalidPortID) 332 return dest_id; 333 334 // Check the address map interval tree 335 auto i = portMap.find(addr); 336 if (i != portMap.end()) { 337 dest_id = i->second; 338 updatePortCache(dest_id, i->first); 339 return dest_id; 340 } 341 342 // Check if this matches the default range 343 if (useDefaultRange) { 344 if (defaultRange.contains(addr)) { 345 DPRINTF(AddrRanges, " found addr %#llx on default\n", 346 addr); 347 return defaultPortID; 348 } 349 } else if (defaultPortID != InvalidPortID) { 350 DPRINTF(AddrRanges, "Unable to find destination for addr %#llx, " 351 "will use default port\n", addr); 352 return defaultPortID; 353 } 354 355 // we should use the range for the default port and it did not 356 // match, or the default port is not set 357 fatal("Unable to find destination for addr %#llx on %s\n", addr, 358 name()); 359} 360 361/** Function called by the port when the crossbar is receiving a range change.*/ 362void 363BaseXBar::recvRangeChange(PortID master_port_id) 364{ 365 DPRINTF(AddrRanges, "Received range change from slave port %s\n", 366 masterPorts[master_port_id]->getSlavePort().name()); 367 368 // remember that we got a range from this master port and thus the 369 // connected slave module 370 gotAddrRanges[master_port_id] = true; 371 372 // update the global flag 373 if (!gotAllAddrRanges) { 374 // take a logical AND of all the ports and see if we got 375 // ranges from everyone 376 gotAllAddrRanges = true; 377 std::vector<bool>::const_iterator r = gotAddrRanges.begin(); 378 while (gotAllAddrRanges && r != gotAddrRanges.end()) { 379 gotAllAddrRanges &= *r++; 380 } 381 if (gotAllAddrRanges) 382 DPRINTF(AddrRanges, "Got address ranges from all slaves\n"); 383 } 384 385 // note that we could get the range from the default port at any 386 // point in time, and we cannot assume that the default range is 387 // set before the other ones are, so we do additional checks once 388 // all ranges are provided 389 if (master_port_id == defaultPortID) { 390 // only update if we are indeed checking ranges for the 391 // default port since the port might not have a valid range 392 // otherwise 393 if (useDefaultRange) { 394 AddrRangeList ranges = masterPorts[master_port_id]->getAddrRanges(); 395 396 if (ranges.size() != 1) 397 fatal("Crossbar %s may only have a single default range", 398 name()); 399 400 defaultRange = ranges.front(); 401 } 402 } else { 403 // the ports are allowed to update their address ranges 404 // dynamically, so remove any existing entries 405 if (gotAddrRanges[master_port_id]) { 406 for (auto p = portMap.begin(); p != portMap.end(); ) { 407 if (p->second == master_port_id) 408 // erasing invalidates the iterator, so advance it 409 // before the deletion takes place 410 portMap.erase(p++); 411 else 412 p++; 413 } 414 } 415 416 AddrRangeList ranges = masterPorts[master_port_id]->getAddrRanges(); 417 418 for (const auto& r: ranges) { 419 DPRINTF(AddrRanges, "Adding range %s for id %d\n", 420 r.to_string(), master_port_id); 421 if (portMap.insert(r, master_port_id) == portMap.end()) { 422 PortID conflict_id = portMap.find(r)->second; 423 fatal("%s has two ports responding within range %s:\n\t%s\n\t%s\n", 424 name(), 425 r.to_string(), 426 masterPorts[master_port_id]->getSlavePort().name(), 427 masterPorts[conflict_id]->getSlavePort().name()); 428 } 429 } 430 } 431 432 // if we have received ranges from all our neighbouring slave 433 // modules, go ahead and tell our connected master modules in 434 // turn, this effectively assumes a tree structure of the system 435 if (gotAllAddrRanges) { 436 DPRINTF(AddrRanges, "Aggregating address ranges\n"); 437 xbarRanges.clear(); 438 439 // start out with the default range 440 if (useDefaultRange) { 441 if (!gotAddrRanges[defaultPortID]) 442 fatal("Crossbar %s uses default range, but none provided", 443 name()); 444 445 xbarRanges.push_back(defaultRange); 446 DPRINTF(AddrRanges, "-- Adding default %s\n", 447 defaultRange.to_string()); 448 } 449 450 // merge all interleaved ranges and add any range that is not 451 // a subset of the default range 452 std::vector<AddrRange> intlv_ranges; 453 for (const auto& r: portMap) { 454 // if the range is interleaved then save it for now 455 if (r.first.interleaved()) { 456 // if we already got interleaved ranges that are not 457 // part of the same range, then first do a merge 458 // before we add the new one 459 if (!intlv_ranges.empty() && 460 !intlv_ranges.back().mergesWith(r.first)) { 461 DPRINTF(AddrRanges, "-- Merging range from %d ranges\n", 462 intlv_ranges.size()); 463 AddrRange merged_range(intlv_ranges); 464 // next decide if we keep the merged range or not 465 if (!(useDefaultRange && 466 merged_range.isSubset(defaultRange))) { 467 xbarRanges.push_back(merged_range); 468 DPRINTF(AddrRanges, "-- Adding merged range %s\n", 469 merged_range.to_string()); 470 } 471 intlv_ranges.clear(); 472 } 473 intlv_ranges.push_back(r.first); 474 } else { 475 // keep the current range if not a subset of the default 476 if (!(useDefaultRange && 477 r.first.isSubset(defaultRange))) { 478 xbarRanges.push_back(r.first); 479 DPRINTF(AddrRanges, "-- Adding range %s\n", 480 r.first.to_string()); 481 } 482 } 483 } 484 485 // if there is still interleaved ranges waiting to be merged, 486 // go ahead and do it 487 if (!intlv_ranges.empty()) { 488 DPRINTF(AddrRanges, "-- Merging range from %d ranges\n", 489 intlv_ranges.size()); 490 AddrRange merged_range(intlv_ranges); 491 if (!(useDefaultRange && merged_range.isSubset(defaultRange))) { 492 xbarRanges.push_back(merged_range); 493 DPRINTF(AddrRanges, "-- Adding merged range %s\n", 494 merged_range.to_string()); 495 } 496 } 497 498 // also check that no range partially overlaps with the 499 // default range, this has to be done after all ranges are set 500 // as there are no guarantees for when the default range is 501 // update with respect to the other ones 502 if (useDefaultRange) { 503 for (const auto& r: xbarRanges) { 504 // see if the new range is partially 505 // overlapping the default range 506 if (r.intersects(defaultRange) && 507 !r.isSubset(defaultRange)) 508 fatal("Range %s intersects the " \ 509 "default range of %s but is not a " \ 510 "subset\n", r.to_string(), name()); 511 } 512 } 513 514 // tell all our neighbouring master ports that our address 515 // ranges have changed 516 for (const auto& s: slavePorts) 517 s->sendRangeChange(); 518 } 519 520 clearPortCache(); 521} 522 523AddrRangeList 524BaseXBar::getAddrRanges() const 525{ 526 // we should never be asked without first having sent a range 527 // change, and the latter is only done once we have all the ranges 528 // of the connected devices 529 assert(gotAllAddrRanges); 530 531 // at the moment, this never happens, as there are no cycles in 532 // the range queries and no devices on the master side of a crossbar 533 // (CPU, cache, bridge etc) actually care about the ranges of the 534 // ports they are connected to 535 536 DPRINTF(AddrRanges, "Received address range request\n"); 537 538 return xbarRanges; 539} 540 541void 542BaseXBar::regStats() 543{ 544 ClockedObject::regStats(); 545 546 using namespace Stats; 547 548 transDist 549 .init(MemCmd::NUM_MEM_CMDS) 550 .name(name() + ".trans_dist") 551 .desc("Transaction distribution") 552 .flags(nozero); 553 554 // get the string representation of the commands 555 for (int i = 0; i < MemCmd::NUM_MEM_CMDS; i++) { 556 MemCmd cmd(i); 557 const std::string &cstr = cmd.toString(); 558 transDist.subname(i, cstr); 559 } 560 561 pktCount 562 .init(slavePorts.size(), masterPorts.size()) 563 .name(name() + ".pkt_count") 564 .desc("Packet count per connected master and slave (bytes)") 565 .flags(total | nozero | nonan); 566 567 pktSize 568 .init(slavePorts.size(), masterPorts.size()) 569 .name(name() + ".pkt_size") 570 .desc("Cumulative packet size per connected master and slave (bytes)") 571 .flags(total | nozero | nonan); 572 573 // both the packet count and total size are two-dimensional 574 // vectors, indexed by slave port id and master port id, thus the 575 // neighbouring master and slave, they do not differentiate what 576 // came from the master and was forwarded to the slave (requests 577 // and snoop responses) and what came from the slave and was 578 // forwarded to the master (responses and snoop requests) 579 for (int i = 0; i < slavePorts.size(); i++) { 580 pktCount.subname(i, slavePorts[i]->getMasterPort().name()); 581 pktSize.subname(i, slavePorts[i]->getMasterPort().name()); 582 for (int j = 0; j < masterPorts.size(); j++) { 583 pktCount.ysubname(j, masterPorts[j]->getSlavePort().name()); 584 pktSize.ysubname(j, masterPorts[j]->getSlavePort().name()); 585 } 586 } 587} 588 589template <typename SrcType, typename DstType> 590DrainState 591BaseXBar::Layer<SrcType,DstType>::drain() 592{ 593 //We should check that we're not "doing" anything, and that noone is 594 //waiting. We might be idle but have someone waiting if the device we 595 //contacted for a retry didn't actually retry. 596 if (state != IDLE) { 597 DPRINTF(Drain, "Crossbar not drained\n"); 598 return DrainState::Draining; 599 } else { 600 return DrainState::Drained; 601 } 602} 603 604template <typename SrcType, typename DstType> 605void 606BaseXBar::Layer<SrcType,DstType>::regStats() 607{ 608 using namespace Stats; 609 610 occupancy 611 .name(name() + ".occupancy") 612 .desc("Layer occupancy (ticks)") 613 .flags(nozero); 614 615 utilization 616 .name(name() + ".utilization") 617 .desc("Layer utilization (%)") 618 .precision(1) 619 .flags(nozero); 620 621 utilization = 100 * occupancy / simTicks; 622} 623 624/** 625 * Crossbar layer template instantiations. Could be removed with _impl.hh 626 * file, but since there are only two given options (MasterPort and 627 * SlavePort) it seems a bit excessive at this point. 628 */ 629template class BaseXBar::Layer<SlavePort,MasterPort>; 630template class BaseXBar::Layer<MasterPort,SlavePort>; 631