xbar.cc revision 12776:410b60d8a397
12568SN/A/* 212652Sandreas.sandberg@arm.com * Copyright (c) 2011-2015, 2018 ARM Limited 38668Sgeoffrey.blake@arm.com * All rights reserved 48668Sgeoffrey.blake@arm.com * 58668Sgeoffrey.blake@arm.com * The license below extends only to copyright in the software and shall 68668Sgeoffrey.blake@arm.com * not be construed as granting a license to any other intellectual 78668Sgeoffrey.blake@arm.com * property including but not limited to intellectual property relating 88668Sgeoffrey.blake@arm.com * to a hardware implementation of the functionality of the software 98668Sgeoffrey.blake@arm.com * licensed hereunder. You may use the software subject to the license 108668Sgeoffrey.blake@arm.com * terms below provided that you ensure that this notice is replicated 118668Sgeoffrey.blake@arm.com * unmodified and in its entirety in all distributions of the software, 128668Sgeoffrey.blake@arm.com * modified or unmodified, in source code or in binary form. 138668Sgeoffrey.blake@arm.com * 142568SN/A * Copyright (c) 2006 The Regents of The University of Michigan 1510975Sdavid.hashe@amd.com * All rights reserved. 162568SN/A * 172568SN/A * Redistribution and use in source and binary forms, with or without 182568SN/A * modification, are permitted provided that the following conditions are 192568SN/A * met: redistributions of source code must retain the above copyright 202568SN/A * notice, this list of conditions and the following disclaimer; 212568SN/A * redistributions in binary form must reproduce the above copyright 222568SN/A * notice, this list of conditions and the following disclaimer in the 232568SN/A * documentation and/or other materials provided with the distribution; 242568SN/A * neither the name of the copyright holders nor the names of its 252568SN/A * contributors may be used to endorse or promote products derived from 262568SN/A * this software without specific prior written permission. 272568SN/A * 282568SN/A * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 292568SN/A * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 302568SN/A * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 312568SN/A * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 322568SN/A * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 332568SN/A * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 342568SN/A * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 352568SN/A * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 362568SN/A * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 372568SN/A * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 382568SN/A * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 392568SN/A * 402665Ssaidi@eecs.umich.edu * Authors: Ali Saidi 412665Ssaidi@eecs.umich.edu * Andreas Hansson 422665Ssaidi@eecs.umich.edu * William Wang 432568SN/A */ 442568SN/A 452568SN/A/** 462568SN/A * @file 472568SN/A * Definition of a crossbar object. 482568SN/A */ 492568SN/A 503260Ssaidi@eecs.umich.edu#include "mem/xbar.hh" 5111793Sbrandon.potter@amd.com 5211793Sbrandon.potter@amd.com#include "base/logging.hh" 538229Snate@binkert.org#include "base/trace.hh" 543260Ssaidi@eecs.umich.edu#include "debug/AddrRanges.hh" 558229Snate@binkert.org#include "debug/Drain.hh" 565314Sstever@gmail.com#include "debug/XBar.hh" 5712334Sgabeblack@google.com 583348Sbinkertn@umich.eduBaseXBar::BaseXBar(const BaseXBarParams *p) 5912652Sandreas.sandberg@arm.com : MemObject(p), 602568SN/A frontendLatency(p->frontend_latency), 615735Snate@binkert.org forwardLatency(p->forward_latency), 625735Snate@binkert.org responseLatency(p->response_latency), 634022Sstever@eecs.umich.edu width(p->width), 644022Sstever@eecs.umich.edu gotAddrRanges(p->port_default_connection_count + 654022Sstever@eecs.umich.edu p->port_master_connection_count, false), 664022Sstever@eecs.umich.edu gotAllAddrRanges(false), defaultPortID(InvalidPortID), 674022Sstever@eecs.umich.edu useDefaultRange(p->use_default_range) 684022Sstever@eecs.umich.edu{} 694022Sstever@eecs.umich.edu 7011600Sandreas.hansson@arm.comBaseXBar::~BaseXBar() 7111600Sandreas.hansson@arm.com{ 722641Sstever@eecs.umich.edu for (auto m: masterPorts) 734022Sstever@eecs.umich.edu delete m; 744022Sstever@eecs.umich.edu 752641Sstever@eecs.umich.edu for (auto s: slavePorts) 764022Sstever@eecs.umich.edu delete s; 774022Sstever@eecs.umich.edu} 7810885Sandreas.hansson@arm.com 7910885Sandreas.hansson@arm.comvoid 804022Sstever@eecs.umich.eduBaseXBar::init() 814473Sstever@eecs.umich.edu{ 824473Sstever@eecs.umich.edu} 835319Sstever@gmail.com 845319Sstever@gmail.comBaseMasterPort & 855319Sstever@gmail.comBaseXBar::getMasterPort(const std::string &if_name, PortID idx) 864022Sstever@eecs.umich.edu{ 8711284Sandreas.hansson@arm.com if (if_name == "master" && idx < masterPorts.size()) { 884022Sstever@eecs.umich.edu // the master port index translates directly to the vector position 894022Sstever@eecs.umich.edu return *masterPorts[idx]; 9011287Sandreas.hansson@arm.com } else if (if_name == "default") { 9111199Sandreas.hansson@arm.com return *masterPorts[defaultPortID]; 9211600Sandreas.hansson@arm.com } else { 9311199Sandreas.hansson@arm.com return MemObject::getMasterPort(if_name, idx); 9411199Sandreas.hansson@arm.com } 9511199Sandreas.hansson@arm.com} 9611199Sandreas.hansson@arm.com 9711600Sandreas.hansson@arm.comBaseSlavePort & 9811199Sandreas.hansson@arm.comBaseXBar::getSlavePort(const std::string &if_name, PortID idx) 9912344Snikos.nikoleris@arm.com{ 10012344Snikos.nikoleris@arm.com if (if_name == "slave" && idx < slavePorts.size()) { 10112344Snikos.nikoleris@arm.com // the slave port index translates directly to the vector position 10210883Sali.jafri@arm.com return *slavePorts[idx]; 10311600Sandreas.hansson@arm.com } else { 1044022Sstever@eecs.umich.edu return MemObject::getSlavePort(if_name, idx); 1054022Sstever@eecs.umich.edu } 1064022Sstever@eecs.umich.edu} 1074022Sstever@eecs.umich.edu 10811600Sandreas.hansson@arm.comvoid 1094022Sstever@eecs.umich.eduBaseXBar::calcPacketTiming(PacketPtr pkt, Tick header_delay) 1104022Sstever@eecs.umich.edu{ 1114022Sstever@eecs.umich.edu // the crossbar will be called at a time that is not necessarily 1124022Sstever@eecs.umich.edu // coinciding with its own clock, so start by determining how long 1134022Sstever@eecs.umich.edu // until the next clock edge (could be zero) 1144022Sstever@eecs.umich.edu Tick offset = clockEdge() - curTick(); 1154022Sstever@eecs.umich.edu 11610886Sandreas.hansson@arm.com // the header delay depends on the path through the crossbar, and 11711284Sandreas.hansson@arm.com // we therefore rely on the caller to provide the actual 11810886Sandreas.hansson@arm.com // value 1194022Sstever@eecs.umich.edu pkt->headerDelay += offset + header_delay; 12011600Sandreas.hansson@arm.com 12111600Sandreas.hansson@arm.com // note that we add the header delay to the existing value, and 1224628Sstever@eecs.umich.edu // align it to the crossbar clock 1237465Ssteve.reinhardt@amd.com 12411600Sandreas.hansson@arm.com // do a quick sanity check to ensure the timings are not being 12511600Sandreas.hansson@arm.com // ignored, note that this specific value may cause problems for 1267465Ssteve.reinhardt@amd.com // slower interconnects 1274628Sstever@eecs.umich.edu panic_if(pkt->headerDelay > SimClock::Int::us, 12811287Sandreas.hansson@arm.com "Encountered header delay exceeding 1 us\n"); 1297465Ssteve.reinhardt@amd.com 13010325Sgeoffrey.blake@arm.com if (pkt->hasData()) { 13111600Sandreas.hansson@arm.com // the payloadDelay takes into account the relative time to 13211600Sandreas.hansson@arm.com // deliver the payload of the packet, after the header delay, 1337465Ssteve.reinhardt@amd.com // we take the maximum since the payload delay could already 13410325Sgeoffrey.blake@arm.com // be longer than what this parcitular crossbar enforces. 13510325Sgeoffrey.blake@arm.com pkt->payloadDelay = std::max<Tick>(pkt->payloadDelay, 13611287Sandreas.hansson@arm.com divCeil(pkt->getSize(), width) * 1377465Ssteve.reinhardt@amd.com clockPeriod()); 13810885Sandreas.hansson@arm.com } 13910885Sandreas.hansson@arm.com 14010885Sandreas.hansson@arm.com // the payload delay is not paying for the clock offset as that is 14111600Sandreas.hansson@arm.com // already done using the header delay, and the payload delay is 14211600Sandreas.hansson@arm.com // also used to determine how long the crossbar layer is busy and 1434022Sstever@eecs.umich.edu // thus regulates throughput 14410885Sandreas.hansson@arm.com} 14510885Sandreas.hansson@arm.com 14611287Sandreas.hansson@arm.comtemplate <typename SrcType, typename DstType> 1474040Ssaidi@eecs.umich.eduBaseXBar::Layer<SrcType,DstType>::Layer(DstType& _port, BaseXBar& _xbar, 14810885Sandreas.hansson@arm.com const std::string& _name) : 14910885Sandreas.hansson@arm.com port(_port), xbar(_xbar), _name(_name), state(IDLE), 15010885Sandreas.hansson@arm.com waitingForPeer(NULL), releaseEvent([this]{ releaseLayer(); }, name()) 15111600Sandreas.hansson@arm.com{ 15211600Sandreas.hansson@arm.com} 15310885Sandreas.hansson@arm.com 15410885Sandreas.hansson@arm.comtemplate <typename SrcType, typename DstType> 15510885Sandreas.hansson@arm.comvoid BaseXBar::Layer<SrcType,DstType>::occupyLayer(Tick until) 15611600Sandreas.hansson@arm.com{ 15711600Sandreas.hansson@arm.com // ensure the state is busy at this point, as the layer should 1585507Sstever@gmail.com // transition from idle as soon as it has decided to forward the 1595507Sstever@gmail.com // packet to prevent any follow-on calls to sendTiming seeing an 1606076Sgblack@eecs.umich.edu // unoccupied layer 1615507Sstever@gmail.com assert(state == BUSY); 1624626Sstever@eecs.umich.edu 16311284Sandreas.hansson@arm.com // until should never be 0 as express snoops never occupy the layer 1644626Sstever@eecs.umich.edu assert(until != 0); 1654626Sstever@eecs.umich.edu xbar.schedule(releaseEvent, until); 16610325Sgeoffrey.blake@arm.com 16711284Sandreas.hansson@arm.com // account for the occupied ticks 1687669Ssteve.reinhardt@amd.com occupancy += until - curTick(); 1697669Ssteve.reinhardt@amd.com 1704626Sstever@eecs.umich.edu DPRINTF(BaseXBar, "The crossbar layer is now busy from tick %d to %d\n", 17111287Sandreas.hansson@arm.com curTick(), until); 1724626Sstever@eecs.umich.edu} 1734040Ssaidi@eecs.umich.edu 17411284Sandreas.hansson@arm.comtemplate <typename SrcType, typename DstType> 1754040Ssaidi@eecs.umich.edubool 1764040Ssaidi@eecs.umich.eduBaseXBar::Layer<SrcType,DstType>::tryTiming(SrcType* src_port) 17711287Sandreas.hansson@arm.com{ 1784870Sstever@eecs.umich.edu // if we are in the retry state, we will not see anything but the 1795650Sgblack@eecs.umich.edu // retrying port (or in the case of the snoop ports the snoop 1805650Sgblack@eecs.umich.edu // response port that mirrors the actual slave port) as we leave 1816063Sgblack@eecs.umich.edu // this state again in zero time if the peer does not immediately 1825650Sgblack@eecs.umich.edu // call the layer when receiving the retry 1836063Sgblack@eecs.umich.edu 18411256Santhony.gutierrez@amd.com // first we see if the layer is busy, next we check if the 18511256Santhony.gutierrez@amd.com // destination port is already engaged in a transaction waiting 18611256Santhony.gutierrez@amd.com // for a retry from the peer 18711256Santhony.gutierrez@amd.com if (state == BUSY || waitingForPeer != NULL) { 18812347Snikos.nikoleris@arm.com // the port should not be waiting already 18912347Snikos.nikoleris@arm.com assert(std::find(waitingForLayer.begin(), waitingForLayer.end(), 19012347Snikos.nikoleris@arm.com src_port) == waitingForLayer.end()); 19112347Snikos.nikoleris@arm.com 19212347Snikos.nikoleris@arm.com // put the port at the end of the retry list waiting for the 19312347Snikos.nikoleris@arm.com // layer to be freed up (and in the case of a busy peer, for 19412347Snikos.nikoleris@arm.com // that transaction to go through, and then the layer to free 19512347Snikos.nikoleris@arm.com // up) 19612347Snikos.nikoleris@arm.com waitingForLayer.push_back(src_port); 19712347Snikos.nikoleris@arm.com return false; 19812347Snikos.nikoleris@arm.com } 19912347Snikos.nikoleris@arm.com 20012347Snikos.nikoleris@arm.com state = BUSY; 20112347Snikos.nikoleris@arm.com 20212347Snikos.nikoleris@arm.com return true; 20312347Snikos.nikoleris@arm.com} 20412347Snikos.nikoleris@arm.com 20512347Snikos.nikoleris@arm.comtemplate <typename SrcType, typename DstType> 2064870Sstever@eecs.umich.eduvoid 2074986Ssaidi@eecs.umich.eduBaseXBar::Layer<SrcType,DstType>::succeededTiming(Tick busy_time) 2084870Sstever@eecs.umich.edu{ 2095314Sstever@gmail.com // we should have gone from idle or retry to busy in the tryTiming 2108436SBrad.Beckmann@amd.com // test 2118436SBrad.Beckmann@amd.com assert(state == BUSY); 2128436SBrad.Beckmann@amd.com 2138436SBrad.Beckmann@amd.com // occupy the layer accordingly 2145314Sstever@gmail.com occupyLayer(busy_time); 2158184Ssomayeh@cs.wisc.edu} 2168184Ssomayeh@cs.wisc.edu 21711284Sandreas.hansson@arm.comtemplate <typename SrcType, typename DstType> 2188716Snilay@cs.wisc.eduvoid 21911600Sandreas.hansson@arm.comBaseXBar::Layer<SrcType,DstType>::failedTiming(SrcType* src_port, 22010886Sandreas.hansson@arm.com Tick busy_time) 22110886Sandreas.hansson@arm.com{ 22211287Sandreas.hansson@arm.com // ensure no one got in between and tried to send something to 22310886Sandreas.hansson@arm.com // this port 2244022Sstever@eecs.umich.edu assert(waitingForPeer == NULL); 2252592SN/A 2263607Srdreslin@umich.edu // if the source port is the current retrying one or not, we have 22710028SGiacomo.Gabrielli@arm.com // failed in forwarding and should track that we are now waiting 22810570Sandreas.hansson@arm.com // for the peer to send a retry 2292641Sstever@eecs.umich.edu waitingForPeer = src_port; 2304626Sstever@eecs.umich.edu 2314626Sstever@eecs.umich.edu // we should have gone from idle or retry to busy in the tryTiming 2324626Sstever@eecs.umich.edu // test 2334626Sstever@eecs.umich.edu assert(state == BUSY); 2343260Ssaidi@eecs.umich.edu 23510028SGiacomo.Gabrielli@arm.com // occupy the bus accordingly 23610028SGiacomo.Gabrielli@arm.com occupyLayer(busy_time); 2374626Sstever@eecs.umich.edu} 2384626Sstever@eecs.umich.edu 2394626Sstever@eecs.umich.edutemplate <typename SrcType, typename DstType> 2403260Ssaidi@eecs.umich.eduvoid 2415314Sstever@gmail.comBaseXBar::Layer<SrcType,DstType>::releaseLayer() 2425314Sstever@gmail.com{ 24310570Sandreas.hansson@arm.com // releasing the bus means we should now be idle 24410376Sandreas.hansson@arm.com assert(state == BUSY); 2455314Sstever@gmail.com assert(!releaseEvent.scheduled()); 2465314Sstever@gmail.com 2475314Sstever@gmail.com // update the state 24810570Sandreas.hansson@arm.com state = IDLE; 24910570Sandreas.hansson@arm.com 25010570Sandreas.hansson@arm.com // bus layer is now idle, so if someone is waiting we can retry 2515314Sstever@gmail.com if (!waitingForLayer.empty()) { 2525314Sstever@gmail.com // there is no point in sending a retry if someone is still 2535314Sstever@gmail.com // waiting for the peer 2544626Sstever@eecs.umich.edu if (waitingForPeer == NULL) 2554626Sstever@eecs.umich.edu retryWaiting(); 2564626Sstever@eecs.umich.edu } else if (waitingForPeer == NULL && drainState() == DrainState::Draining) { 2573260Ssaidi@eecs.umich.edu DPRINTF(Drain, "Crossbar done draining, signaling drain manager\n"); 2584626Sstever@eecs.umich.edu //If we weren't able to drain before, do it now. 2594626Sstever@eecs.umich.edu signalDrainDone(); 26010570Sandreas.hansson@arm.com } 26110723Sandreas.hansson@arm.com} 26210723Sandreas.hansson@arm.com 26310570Sandreas.hansson@arm.comtemplate <typename SrcType, typename DstType> 26410570Sandreas.hansson@arm.comvoid 2654626Sstever@eecs.umich.eduBaseXBar::Layer<SrcType,DstType>::retryWaiting() 2663260Ssaidi@eecs.umich.edu{ 2678668Sgeoffrey.blake@arm.com // this should never be called with no one waiting 2688668Sgeoffrey.blake@arm.com assert(!waitingForLayer.empty()); 2698668Sgeoffrey.blake@arm.com 2708668Sgeoffrey.blake@arm.com // we always go to retrying from idle 2718668Sgeoffrey.blake@arm.com assert(state == IDLE); 2728668Sgeoffrey.blake@arm.com 2738668Sgeoffrey.blake@arm.com // update the state 27410723Sandreas.hansson@arm.com state = RETRY; 27510723Sandreas.hansson@arm.com 2768668Sgeoffrey.blake@arm.com // set the retrying port to the front of the retry list and pop it 2778668Sgeoffrey.blake@arm.com // off the list 2788668Sgeoffrey.blake@arm.com SrcType* retryingPort = waitingForLayer.front(); 2798668Sgeoffrey.blake@arm.com waitingForLayer.pop_front(); 28010723Sandreas.hansson@arm.com 28110723Sandreas.hansson@arm.com // tell the port to retry, which in some cases ends up calling the 2828668Sgeoffrey.blake@arm.com // layer again 2838668Sgeoffrey.blake@arm.com sendRetry(retryingPort); 2848668Sgeoffrey.blake@arm.com 2858668Sgeoffrey.blake@arm.com // If the layer is still in the retry state, sendTiming wasn't 28610723Sandreas.hansson@arm.com // called in zero time (e.g. the cache does this when a writeback 28710723Sandreas.hansson@arm.com // is squashed) 28810723Sandreas.hansson@arm.com if (state == RETRY) { 2898668Sgeoffrey.blake@arm.com // update the state to busy and reset the retrying port, we 2908668Sgeoffrey.blake@arm.com // have done our bit and sent the retry 2918668Sgeoffrey.blake@arm.com state = BUSY; 29210723Sandreas.hansson@arm.com 29310723Sandreas.hansson@arm.com // occupy the crossbar layer until the next clock edge 29410723Sandreas.hansson@arm.com occupyLayer(xbar.clockEdge()); 29510723Sandreas.hansson@arm.com } 29610723Sandreas.hansson@arm.com} 29710723Sandreas.hansson@arm.com 2988668Sgeoffrey.blake@arm.comtemplate <typename SrcType, typename DstType> 29910723Sandreas.hansson@arm.comvoid 30010723Sandreas.hansson@arm.comBaseXBar::Layer<SrcType,DstType>::recvRetry() 30110723Sandreas.hansson@arm.com{ 3028668Sgeoffrey.blake@arm.com // we should never get a retry without having failed to forward 3038668Sgeoffrey.blake@arm.com // something to this port 3048668Sgeoffrey.blake@arm.com assert(waitingForPeer != NULL); 3058668Sgeoffrey.blake@arm.com 30610570Sandreas.hansson@arm.com // add the port where the failed packet originated to the front of 3078668Sgeoffrey.blake@arm.com // the waiting ports for the layer, this allows us to call retry 3088668Sgeoffrey.blake@arm.com // on the port immediately if the crossbar layer is idle 30910723Sandreas.hansson@arm.com waitingForLayer.push_front(waitingForPeer); 31010723Sandreas.hansson@arm.com 31110723Sandreas.hansson@arm.com // we are no longer waiting for the peer 31210723Sandreas.hansson@arm.com waitingForPeer = NULL; 31310723Sandreas.hansson@arm.com 31410723Sandreas.hansson@arm.com // if the layer is idle, retry this port straight away, if we 31510723Sandreas.hansson@arm.com // are busy, then simply let the port wait for its turn 31610723Sandreas.hansson@arm.com if (state == IDLE) { 31710723Sandreas.hansson@arm.com retryWaiting(); 31810723Sandreas.hansson@arm.com } else { 31910723Sandreas.hansson@arm.com assert(state == BUSY); 32010723Sandreas.hansson@arm.com } 32110723Sandreas.hansson@arm.com} 32210723Sandreas.hansson@arm.com 32310723Sandreas.hansson@arm.comPortID 32410723Sandreas.hansson@arm.comBaseXBar::findPort(Addr addr) 32510723Sandreas.hansson@arm.com{ 32610723Sandreas.hansson@arm.com // we should never see any address lookups before we've got the 32710723Sandreas.hansson@arm.com // ranges of all connected slave modules 32810723Sandreas.hansson@arm.com assert(gotAllAddrRanges); 32910723Sandreas.hansson@arm.com 33010723Sandreas.hansson@arm.com // Check the cache 33110723Sandreas.hansson@arm.com PortID dest_id = checkPortCache(addr); 3323260Ssaidi@eecs.umich.edu if (dest_id != InvalidPortID) 3334626Sstever@eecs.umich.edu return dest_id; 3344626Sstever@eecs.umich.edu 33510570Sandreas.hansson@arm.com // Check the address map interval tree 3365735Snate@binkert.org auto i = portMap.contains(addr); 3375735Snate@binkert.org if (i != portMap.end()) { 3385735Snate@binkert.org dest_id = i->second; 33910570Sandreas.hansson@arm.com updatePortCache(dest_id, i->first); 3405735Snate@binkert.org return dest_id; 3413260Ssaidi@eecs.umich.edu } 3425314Sstever@gmail.com 3434626Sstever@eecs.umich.edu // Check if this matches the default range 3445314Sstever@gmail.com if (useDefaultRange) { 3455314Sstever@gmail.com if (defaultRange.contains(addr)) { 3465314Sstever@gmail.com DPRINTF(AddrRanges, " found addr %#llx on default\n", 3475314Sstever@gmail.com addr); 3482641Sstever@eecs.umich.edu return defaultPortID; 3493260Ssaidi@eecs.umich.edu } 3505314Sstever@gmail.com } else if (defaultPortID != InvalidPortID) { 3519542Sandreas.hansson@arm.com DPRINTF(AddrRanges, "Unable to find destination for addr %#llx, " 3529542Sandreas.hansson@arm.com "will use default port\n", addr); 3539542Sandreas.hansson@arm.com return defaultPortID; 3549542Sandreas.hansson@arm.com } 3559542Sandreas.hansson@arm.com 3569542Sandreas.hansson@arm.com // we should use the range for the default port and it did not 3579542Sandreas.hansson@arm.com // match, or the default port is not set 3589542Sandreas.hansson@arm.com fatal("Unable to find destination for addr %#llx on %s\n", addr, 3599542Sandreas.hansson@arm.com name()); 3609542Sandreas.hansson@arm.com} 3619542Sandreas.hansson@arm.com 3629542Sandreas.hansson@arm.com/** Function called by the port when the crossbar is receiving a range change.*/ 3639542Sandreas.hansson@arm.comvoid 3649542Sandreas.hansson@arm.comBaseXBar::recvRangeChange(PortID master_port_id) 3659542Sandreas.hansson@arm.com{ 3669542Sandreas.hansson@arm.com DPRINTF(AddrRanges, "Received range change from slave port %s\n", 3679542Sandreas.hansson@arm.com masterPorts[master_port_id]->getSlavePort().name()); 36812652Sandreas.sandberg@arm.com 36912652Sandreas.sandberg@arm.com // remember that we got a range from this master port and thus the 37012652Sandreas.sandberg@arm.com // connected slave module 37112652Sandreas.sandberg@arm.com gotAddrRanges[master_port_id] = true; 37212652Sandreas.sandberg@arm.com 37312652Sandreas.sandberg@arm.com // update the global flag 37412652Sandreas.sandberg@arm.com if (!gotAllAddrRanges) { 37512652Sandreas.sandberg@arm.com // take a logical AND of all the ports and see if we got 37612652Sandreas.sandberg@arm.com // ranges from everyone 37712652Sandreas.sandberg@arm.com gotAllAddrRanges = true; 37812652Sandreas.sandberg@arm.com std::vector<bool>::const_iterator r = gotAddrRanges.begin(); 37912652Sandreas.sandberg@arm.com while (gotAllAddrRanges && r != gotAddrRanges.end()) { 38012652Sandreas.sandberg@arm.com gotAllAddrRanges &= *r++; 38112652Sandreas.sandberg@arm.com } 38212652Sandreas.sandberg@arm.com if (gotAllAddrRanges) 38312652Sandreas.sandberg@arm.com DPRINTF(AddrRanges, "Got address ranges from all slaves\n"); 38412652Sandreas.sandberg@arm.com } 38512652Sandreas.sandberg@arm.com 38612652Sandreas.sandberg@arm.com // note that we could get the range from the default port at any 38712652Sandreas.sandberg@arm.com // point in time, and we cannot assume that the default range is 38812652Sandreas.sandberg@arm.com // set before the other ones are, so we do additional checks once 38912652Sandreas.sandberg@arm.com // all ranges are provided 39012652Sandreas.sandberg@arm.com if (master_port_id == defaultPortID) { 39112652Sandreas.sandberg@arm.com // only update if we are indeed checking ranges for the 39212652Sandreas.sandberg@arm.com // default port since the port might not have a valid range 39312652Sandreas.sandberg@arm.com // otherwise 39412652Sandreas.sandberg@arm.com if (useDefaultRange) { 39512652Sandreas.sandberg@arm.com AddrRangeList ranges = masterPorts[master_port_id]->getAddrRanges(); 39612652Sandreas.sandberg@arm.com 39712652Sandreas.sandberg@arm.com if (ranges.size() != 1) 39812652Sandreas.sandberg@arm.com fatal("Crossbar %s may only have a single default range", 39912652Sandreas.sandberg@arm.com name()); 40012652Sandreas.sandberg@arm.com 40112652Sandreas.sandberg@arm.com defaultRange = ranges.front(); 40212652Sandreas.sandberg@arm.com } 40312652Sandreas.sandberg@arm.com } else { 40412652Sandreas.sandberg@arm.com // the ports are allowed to update their address ranges 40512652Sandreas.sandberg@arm.com // dynamically, so remove any existing entries 40612652Sandreas.sandberg@arm.com if (gotAddrRanges[master_port_id]) { 4079542Sandreas.hansson@arm.com for (auto p = portMap.begin(); p != portMap.end(); ) { 4085735Snate@binkert.org if (p->second == master_port_id) 4093260Ssaidi@eecs.umich.edu // erasing invalidates the iterator, so advance it 41012346Snikos.nikoleris@arm.com // before the deletion takes place 41111744Snikos.nikoleris@arm.com portMap.erase(p++); 41211744Snikos.nikoleris@arm.com else 41311744Snikos.nikoleris@arm.com p++; 41411744Snikos.nikoleris@arm.com } 41512346Snikos.nikoleris@arm.com } 41612346Snikos.nikoleris@arm.com 41712346Snikos.nikoleris@arm.com AddrRangeList ranges = masterPorts[master_port_id]->getAddrRanges(); 4183260Ssaidi@eecs.umich.edu 4193260Ssaidi@eecs.umich.edu for (const auto& r: ranges) { 4209663Suri.wiener@arm.com DPRINTF(AddrRanges, "Adding range %s for id %d\n", 4219663Suri.wiener@arm.com r.to_string(), master_port_id); 4229663Suri.wiener@arm.com if (portMap.insert(r, master_port_id) == portMap.end()) { 4239663Suri.wiener@arm.com PortID conflict_id = portMap.intersects(r)->second; 4249663Suri.wiener@arm.com fatal("%s has two ports responding within range " 4259663Suri.wiener@arm.com "%s:\n\t%s\n\t%s\n", 4269663Suri.wiener@arm.com name(), 4275735Snate@binkert.org r.to_string(), 4285735Snate@binkert.org masterPorts[master_port_id]->getSlavePort().name(), 4295314Sstever@gmail.com masterPorts[conflict_id]->getSlavePort().name()); 4305314Sstever@gmail.com } 4315314Sstever@gmail.com } 4325314Sstever@gmail.com } 4335314Sstever@gmail.com 4345314Sstever@gmail.com // if we have received ranges from all our neighbouring slave 4355314Sstever@gmail.com // modules, go ahead and tell our connected master modules in 4365314Sstever@gmail.com // turn, this effectively assumes a tree structure of the system 4375314Sstever@gmail.com if (gotAllAddrRanges) { 4385314Sstever@gmail.com DPRINTF(AddrRanges, "Aggregating address ranges\n"); 4395314Sstever@gmail.com xbarRanges.clear(); 4405314Sstever@gmail.com 4415735Snate@binkert.org // start out with the default range 4425314Sstever@gmail.com if (useDefaultRange) { 4435314Sstever@gmail.com if (!gotAddrRanges[defaultPortID]) 4445314Sstever@gmail.com fatal("Crossbar %s uses default range, but none provided", 4455314Sstever@gmail.com name()); 4465314Sstever@gmail.com 4475735Snate@binkert.org xbarRanges.push_back(defaultRange); 4485314Sstever@gmail.com DPRINTF(AddrRanges, "-- Adding default %s\n", 4495314Sstever@gmail.com defaultRange.to_string()); 4505735Snate@binkert.org } 4515314Sstever@gmail.com 4525314Sstever@gmail.com // merge all interleaved ranges and add any range that is not 4535314Sstever@gmail.com // a subset of the default range 4545314Sstever@gmail.com std::vector<AddrRange> intlv_ranges; 4555314Sstever@gmail.com for (const auto& r: portMap) { 4565314Sstever@gmail.com // if the range is interleaved then save it for now 4575314Sstever@gmail.com if (r.first.interleaved()) { 4585314Sstever@gmail.com // if we already got interleaved ranges that are not 4595314Sstever@gmail.com // part of the same range, then first do a merge 4605314Sstever@gmail.com // before we add the new one 4615314Sstever@gmail.com if (!intlv_ranges.empty() && 4625314Sstever@gmail.com !intlv_ranges.back().mergesWith(r.first)) { 4635314Sstever@gmail.com DPRINTF(AddrRanges, "-- Merging range from %d ranges\n", 4645314Sstever@gmail.com intlv_ranges.size()); 4655314Sstever@gmail.com AddrRange merged_range(intlv_ranges); 4665314Sstever@gmail.com // next decide if we keep the merged range or not 4675314Sstever@gmail.com if (!(useDefaultRange && 4685314Sstever@gmail.com merged_range.isSubset(defaultRange))) { 4695314Sstever@gmail.com xbarRanges.push_back(merged_range); 4705314Sstever@gmail.com DPRINTF(AddrRanges, "-- Adding merged range %s\n", 4715314Sstever@gmail.com merged_range.to_string()); 4725314Sstever@gmail.com } 4735314Sstever@gmail.com intlv_ranges.clear(); 4745314Sstever@gmail.com } 4755314Sstever@gmail.com intlv_ranges.push_back(r.first); 4765314Sstever@gmail.com } else { 4775314Sstever@gmail.com // keep the current range if not a subset of the default 4785314Sstever@gmail.com if (!(useDefaultRange && 4795314Sstever@gmail.com r.first.isSubset(defaultRange))) { 4805314Sstever@gmail.com xbarRanges.push_back(r.first); 4815314Sstever@gmail.com DPRINTF(AddrRanges, "-- Adding range %s\n", 4825314Sstever@gmail.com r.first.to_string()); 4835314Sstever@gmail.com } 4845314Sstever@gmail.com } 4855314Sstever@gmail.com } 486 487 // if there is still interleaved ranges waiting to be merged, 488 // go ahead and do it 489 if (!intlv_ranges.empty()) { 490 DPRINTF(AddrRanges, "-- Merging range from %d ranges\n", 491 intlv_ranges.size()); 492 AddrRange merged_range(intlv_ranges); 493 if (!(useDefaultRange && merged_range.isSubset(defaultRange))) { 494 xbarRanges.push_back(merged_range); 495 DPRINTF(AddrRanges, "-- Adding merged range %s\n", 496 merged_range.to_string()); 497 } 498 } 499 500 // also check that no range partially intersects with the 501 // default range, this has to be done after all ranges are set 502 // as there are no guarantees for when the default range is 503 // update with respect to the other ones 504 if (useDefaultRange) { 505 for (const auto& r: xbarRanges) { 506 // see if the new range is partially 507 // overlapping the default range 508 if (r.intersects(defaultRange) && 509 !r.isSubset(defaultRange)) 510 fatal("Range %s intersects the " \ 511 "default range of %s but is not a " \ 512 "subset\n", r.to_string(), name()); 513 } 514 } 515 516 // tell all our neighbouring master ports that our address 517 // ranges have changed 518 for (const auto& s: slavePorts) 519 s->sendRangeChange(); 520 } 521 522 clearPortCache(); 523} 524 525AddrRangeList 526BaseXBar::getAddrRanges() const 527{ 528 // we should never be asked without first having sent a range 529 // change, and the latter is only done once we have all the ranges 530 // of the connected devices 531 assert(gotAllAddrRanges); 532 533 // at the moment, this never happens, as there are no cycles in 534 // the range queries and no devices on the master side of a crossbar 535 // (CPU, cache, bridge etc) actually care about the ranges of the 536 // ports they are connected to 537 538 DPRINTF(AddrRanges, "Received address range request\n"); 539 540 return xbarRanges; 541} 542 543void 544BaseXBar::regStats() 545{ 546 ClockedObject::regStats(); 547 548 using namespace Stats; 549 550 transDist 551 .init(MemCmd::NUM_MEM_CMDS) 552 .name(name() + ".trans_dist") 553 .desc("Transaction distribution") 554 .flags(nozero); 555 556 // get the string representation of the commands 557 for (int i = 0; i < MemCmd::NUM_MEM_CMDS; i++) { 558 MemCmd cmd(i); 559 const std::string &cstr = cmd.toString(); 560 transDist.subname(i, cstr); 561 } 562 563 pktCount 564 .init(slavePorts.size(), masterPorts.size()) 565 .name(name() + ".pkt_count") 566 .desc("Packet count per connected master and slave (bytes)") 567 .flags(total | nozero | nonan); 568 569 pktSize 570 .init(slavePorts.size(), masterPorts.size()) 571 .name(name() + ".pkt_size") 572 .desc("Cumulative packet size per connected master and slave (bytes)") 573 .flags(total | nozero | nonan); 574 575 // both the packet count and total size are two-dimensional 576 // vectors, indexed by slave port id and master port id, thus the 577 // neighbouring master and slave, they do not differentiate what 578 // came from the master and was forwarded to the slave (requests 579 // and snoop responses) and what came from the slave and was 580 // forwarded to the master (responses and snoop requests) 581 for (int i = 0; i < slavePorts.size(); i++) { 582 pktCount.subname(i, slavePorts[i]->getMasterPort().name()); 583 pktSize.subname(i, slavePorts[i]->getMasterPort().name()); 584 for (int j = 0; j < masterPorts.size(); j++) { 585 pktCount.ysubname(j, masterPorts[j]->getSlavePort().name()); 586 pktSize.ysubname(j, masterPorts[j]->getSlavePort().name()); 587 } 588 } 589} 590 591template <typename SrcType, typename DstType> 592DrainState 593BaseXBar::Layer<SrcType,DstType>::drain() 594{ 595 //We should check that we're not "doing" anything, and that noone is 596 //waiting. We might be idle but have someone waiting if the device we 597 //contacted for a retry didn't actually retry. 598 if (state != IDLE) { 599 DPRINTF(Drain, "Crossbar not drained\n"); 600 return DrainState::Draining; 601 } else { 602 return DrainState::Drained; 603 } 604} 605 606template <typename SrcType, typename DstType> 607void 608BaseXBar::Layer<SrcType,DstType>::regStats() 609{ 610 using namespace Stats; 611 612 occupancy 613 .name(name() + ".occupancy") 614 .desc("Layer occupancy (ticks)") 615 .flags(nozero); 616 617 utilization 618 .name(name() + ".utilization") 619 .desc("Layer utilization (%)") 620 .precision(1) 621 .flags(nozero); 622 623 utilization = 100 * occupancy / simTicks; 624} 625 626/** 627 * Crossbar layer template instantiations. Could be removed with _impl.hh 628 * file, but since there are only two given options (MasterPort and 629 * SlavePort) it seems a bit excessive at this point. 630 */ 631template class BaseXBar::Layer<SlavePort,MasterPort>; 632template class BaseXBar::Layer<MasterPort,SlavePort>; 633