xbar.cc revision 12780
14997Sgblack@eecs.umich.edu/* 25417Sgblack@eecs.umich.edu * Copyright (c) 2011-2015, 2018 ARM Limited 34997Sgblack@eecs.umich.edu * All rights reserved 44997Sgblack@eecs.umich.edu * 54997Sgblack@eecs.umich.edu * The license below extends only to copyright in the software and shall 64997Sgblack@eecs.umich.edu * not be construed as granting a license to any other intellectual 74997Sgblack@eecs.umich.edu * property including but not limited to intellectual property relating 84997Sgblack@eecs.umich.edu * to a hardware implementation of the functionality of the software 94997Sgblack@eecs.umich.edu * licensed hereunder. You may use the software subject to the license 104997Sgblack@eecs.umich.edu * terms below provided that you ensure that this notice is replicated 114997Sgblack@eecs.umich.edu * unmodified and in its entirety in all distributions of the software, 124997Sgblack@eecs.umich.edu * modified or unmodified, in source code or in binary form. 134997Sgblack@eecs.umich.edu * 144997Sgblack@eecs.umich.edu * Copyright (c) 2006 The Regents of The University of Michigan 154997Sgblack@eecs.umich.edu * All rights reserved. 164997Sgblack@eecs.umich.edu * 174997Sgblack@eecs.umich.edu * Redistribution and use in source and binary forms, with or without 184997Sgblack@eecs.umich.edu * modification, are permitted provided that the following conditions are 194997Sgblack@eecs.umich.edu * met: redistributions of source code must retain the above copyright 204997Sgblack@eecs.umich.edu * notice, this list of conditions and the following disclaimer; 214997Sgblack@eecs.umich.edu * redistributions in binary form must reproduce the above copyright 224997Sgblack@eecs.umich.edu * notice, this list of conditions and the following disclaimer in the 234997Sgblack@eecs.umich.edu * documentation and/or other materials provided with the distribution; 244997Sgblack@eecs.umich.edu * neither the name of the copyright holders nor the names of its 254997Sgblack@eecs.umich.edu * contributors may be used to endorse or promote products derived from 264997Sgblack@eecs.umich.edu * this software without specific prior written permission. 274997Sgblack@eecs.umich.edu * 284997Sgblack@eecs.umich.edu * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 294997Sgblack@eecs.umich.edu * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 304997Sgblack@eecs.umich.edu * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 314997Sgblack@eecs.umich.edu * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 324997Sgblack@eecs.umich.edu * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 334997Sgblack@eecs.umich.edu * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 344997Sgblack@eecs.umich.edu * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 354997Sgblack@eecs.umich.edu * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 364997Sgblack@eecs.umich.edu * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 374997Sgblack@eecs.umich.edu * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 384997Sgblack@eecs.umich.edu * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 394997Sgblack@eecs.umich.edu * 404997Sgblack@eecs.umich.edu * Authors: Ali Saidi 414997Sgblack@eecs.umich.edu * Andreas Hansson 424997Sgblack@eecs.umich.edu * William Wang 434997Sgblack@eecs.umich.edu */ 444997Sgblack@eecs.umich.edu 454997Sgblack@eecs.umich.edu/** 464997Sgblack@eecs.umich.edu * @file 474997Sgblack@eecs.umich.edu * Definition of a crossbar object. 484997Sgblack@eecs.umich.edu */ 494997Sgblack@eecs.umich.edu 504997Sgblack@eecs.umich.edu#include "mem/xbar.hh" 514997Sgblack@eecs.umich.edu 524997Sgblack@eecs.umich.edu#include "base/logging.hh" 534997Sgblack@eecs.umich.edu#include "base/trace.hh" 544997Sgblack@eecs.umich.edu#include "debug/AddrRanges.hh" 554997Sgblack@eecs.umich.edu#include "debug/Drain.hh" 564997Sgblack@eecs.umich.edu#include "debug/XBar.hh" 574997Sgblack@eecs.umich.edu 584997Sgblack@eecs.umich.eduBaseXBar::BaseXBar(const BaseXBarParams *p) 594997Sgblack@eecs.umich.edu : MemObject(p), 605086Sgblack@eecs.umich.edu frontendLatency(p->frontend_latency), 615086Sgblack@eecs.umich.edu forwardLatency(p->forward_latency), 626315Sgblack@eecs.umich.edu responseLatency(p->response_latency), 635912Sgblack@eecs.umich.edu width(p->width), 646313Sgblack@eecs.umich.edu gotAddrRanges(p->port_default_connection_count + 655124Sgblack@eecs.umich.edu p->port_master_connection_count, false), 665086Sgblack@eecs.umich.edu gotAllAddrRanges(false), defaultPortID(InvalidPortID), 675149Sgblack@eecs.umich.edu useDefaultRange(p->use_default_range) 685086Sgblack@eecs.umich.edu{} 695086Sgblack@eecs.umich.edu 705237Sgblack@eecs.umich.eduBaseXBar::~BaseXBar() 715086Sgblack@eecs.umich.edu{ 725086Sgblack@eecs.umich.edu for (auto m: masterPorts) 735086Sgblack@eecs.umich.edu delete m; 745086Sgblack@eecs.umich.edu 755245Sgblack@eecs.umich.edu for (auto s: slavePorts) 765245Sgblack@eecs.umich.edu delete s; 775245Sgblack@eecs.umich.edu} 785895Sgblack@eecs.umich.edu 795895Sgblack@eecs.umich.eduvoid 805895Sgblack@eecs.umich.eduBaseXBar::init() 815245Sgblack@eecs.umich.edu{ 825086Sgblack@eecs.umich.edu} 835086Sgblack@eecs.umich.edu 845086Sgblack@eecs.umich.eduBaseMasterPort & 855358Sgblack@eecs.umich.eduBaseXBar::getMasterPort(const std::string &if_name, PortID idx) 865124Sgblack@eecs.umich.edu{ 875124Sgblack@eecs.umich.edu if (if_name == "master" && idx < masterPorts.size()) { 885124Sgblack@eecs.umich.edu // the master port index translates directly to the vector position 895124Sgblack@eecs.umich.edu return *masterPorts[idx]; 905124Sgblack@eecs.umich.edu } else if (if_name == "default") { 915124Sgblack@eecs.umich.edu return *masterPorts[defaultPortID]; 925124Sgblack@eecs.umich.edu } else { 935237Sgblack@eecs.umich.edu return MemObject::getMasterPort(if_name, idx); 945245Sgblack@eecs.umich.edu } 955245Sgblack@eecs.umich.edu} 965245Sgblack@eecs.umich.edu 975236Sgblack@eecs.umich.eduBaseSlavePort & 985236Sgblack@eecs.umich.eduBaseXBar::getSlavePort(const std::string &if_name, PortID idx) 995895Sgblack@eecs.umich.edu{ 1005124Sgblack@eecs.umich.edu if (if_name == "slave" && idx < slavePorts.size()) { 1015124Sgblack@eecs.umich.edu // the slave port index translates directly to the vector position 1025124Sgblack@eecs.umich.edu return *slavePorts[idx]; 1035124Sgblack@eecs.umich.edu } else { 1045124Sgblack@eecs.umich.edu return MemObject::getSlavePort(if_name, idx); 1055124Sgblack@eecs.umich.edu } 1065124Sgblack@eecs.umich.edu} 1075124Sgblack@eecs.umich.edu 1085124Sgblack@eecs.umich.eduvoid 1095124Sgblack@eecs.umich.eduBaseXBar::calcPacketTiming(PacketPtr pkt, Tick header_delay) 1105124Sgblack@eecs.umich.edu{ 1115124Sgblack@eecs.umich.edu // the crossbar will be called at a time that is not necessarily 1125124Sgblack@eecs.umich.edu // coinciding with its own clock, so start by determining how long 1135124Sgblack@eecs.umich.edu // until the next clock edge (could be zero) 1145124Sgblack@eecs.umich.edu Tick offset = clockEdge() - curTick(); 1155895Sgblack@eecs.umich.edu 1165124Sgblack@eecs.umich.edu // the header delay depends on the path through the crossbar, and 1175124Sgblack@eecs.umich.edu // we therefore rely on the caller to provide the actual 1185360Sgblack@eecs.umich.edu // value 1195360Sgblack@eecs.umich.edu pkt->headerDelay += offset + header_delay; 1205124Sgblack@eecs.umich.edu 1215124Sgblack@eecs.umich.edu // note that we add the header delay to the existing value, and 1225124Sgblack@eecs.umich.edu // align it to the crossbar clock 1235124Sgblack@eecs.umich.edu 1245124Sgblack@eecs.umich.edu // do a quick sanity check to ensure the timings are not being 1255124Sgblack@eecs.umich.edu // ignored, note that this specific value may cause problems for 1265124Sgblack@eecs.umich.edu // slower interconnects 1275124Sgblack@eecs.umich.edu panic_if(pkt->headerDelay > SimClock::Int::us, 1285360Sgblack@eecs.umich.edu "Encountered header delay exceeding 1 us\n"); 1295124Sgblack@eecs.umich.edu 1305360Sgblack@eecs.umich.edu if (pkt->hasData()) { 1315124Sgblack@eecs.umich.edu // the payloadDelay takes into account the relative time to 1325360Sgblack@eecs.umich.edu // deliver the payload of the packet, after the header delay, 1335124Sgblack@eecs.umich.edu // we take the maximum since the payload delay could already 1345124Sgblack@eecs.umich.edu // be longer than what this parcitular crossbar enforces. 1355360Sgblack@eecs.umich.edu pkt->payloadDelay = std::max<Tick>(pkt->payloadDelay, 1365360Sgblack@eecs.umich.edu divCeil(pkt->getSize(), width) * 1375360Sgblack@eecs.umich.edu clockPeriod()); 1385360Sgblack@eecs.umich.edu } 1395360Sgblack@eecs.umich.edu 1405360Sgblack@eecs.umich.edu // the payload delay is not paying for the clock offset as that is 1415360Sgblack@eecs.umich.edu // already done using the header delay, and the payload delay is 1425360Sgblack@eecs.umich.edu // also used to determine how long the crossbar layer is busy and 1435360Sgblack@eecs.umich.edu // thus regulates throughput 1445360Sgblack@eecs.umich.edu} 1455360Sgblack@eecs.umich.edu 1465124Sgblack@eecs.umich.edutemplate <typename SrcType, typename DstType> 1475124Sgblack@eecs.umich.eduBaseXBar::Layer<SrcType,DstType>::Layer(DstType& _port, BaseXBar& _xbar, 1485124Sgblack@eecs.umich.edu const std::string& _name) : 1495124Sgblack@eecs.umich.edu port(_port), xbar(_xbar), _name(_name), state(IDLE), 1505124Sgblack@eecs.umich.edu waitingForPeer(NULL), releaseEvent([this]{ releaseLayer(); }, name()) 1515242Sgblack@eecs.umich.edu{ 1525242Sgblack@eecs.umich.edu} 1535242Sgblack@eecs.umich.edu 1545242Sgblack@eecs.umich.edutemplate <typename SrcType, typename DstType> 1555242Sgblack@eecs.umich.eduvoid BaseXBar::Layer<SrcType,DstType>::occupyLayer(Tick until) 1565242Sgblack@eecs.umich.edu{ 1575124Sgblack@eecs.umich.edu // ensure the state is busy at this point, as the layer should 1585124Sgblack@eecs.umich.edu // transition from idle as soon as it has decided to forward the 1595124Sgblack@eecs.umich.edu // packet to prevent any follow-on calls to sendTiming seeing an 1605357Sgblack@eecs.umich.edu // unoccupied layer 1615357Sgblack@eecs.umich.edu assert(state == BUSY); 1625357Sgblack@eecs.umich.edu 1635357Sgblack@eecs.umich.edu // until should never be 0 as express snoops never occupy the layer 1645357Sgblack@eecs.umich.edu assert(until != 0); 1655357Sgblack@eecs.umich.edu xbar.schedule(releaseEvent, until); 1665124Sgblack@eecs.umich.edu 1675124Sgblack@eecs.umich.edu // account for the occupied ticks 1685242Sgblack@eecs.umich.edu occupancy += until - curTick(); 1695242Sgblack@eecs.umich.edu 1705242Sgblack@eecs.umich.edu DPRINTF(BaseXBar, "The crossbar layer is now busy from tick %d to %d\n", 1715242Sgblack@eecs.umich.edu curTick(), until); 1725242Sgblack@eecs.umich.edu} 1735242Sgblack@eecs.umich.edu 1745242Sgblack@eecs.umich.edutemplate <typename SrcType, typename DstType> 1755242Sgblack@eecs.umich.edubool 1765242Sgblack@eecs.umich.eduBaseXBar::Layer<SrcType,DstType>::tryTiming(SrcType* src_port) 1775242Sgblack@eecs.umich.edu{ 1785124Sgblack@eecs.umich.edu // if we are in the retry state, we will not see anything but the 1795124Sgblack@eecs.umich.edu // retrying port (or in the case of the snoop ports the snoop 1805124Sgblack@eecs.umich.edu // response port that mirrors the actual slave port) as we leave 1815358Sgblack@eecs.umich.edu // this state again in zero time if the peer does not immediately 1825086Sgblack@eecs.umich.edu // call the layer when receiving the retry 1835359Sgblack@eecs.umich.edu 1845359Sgblack@eecs.umich.edu // first we see if the layer is busy, next we check if the 1855359Sgblack@eecs.umich.edu // destination port is already engaged in a transaction waiting 1865359Sgblack@eecs.umich.edu // for a retry from the peer 1875359Sgblack@eecs.umich.edu if (state == BUSY || waitingForPeer != NULL) { 1885086Sgblack@eecs.umich.edu // the port should not be waiting already 1895086Sgblack@eecs.umich.edu assert(std::find(waitingForLayer.begin(), waitingForLayer.end(), 1905086Sgblack@eecs.umich.edu src_port) == waitingForLayer.end()); 1916141Sgblack@eecs.umich.edu 1926141Sgblack@eecs.umich.edu // put the port at the end of the retry list waiting for the 1936141Sgblack@eecs.umich.edu // layer to be freed up (and in the case of a busy peer, for 1946141Sgblack@eecs.umich.edu // that transaction to go through, and then the layer to free 1956141Sgblack@eecs.umich.edu // up) 1966141Sgblack@eecs.umich.edu waitingForLayer.push_back(src_port); 1976141Sgblack@eecs.umich.edu return false; 1986141Sgblack@eecs.umich.edu } 1996141Sgblack@eecs.umich.edu 2006141Sgblack@eecs.umich.edu state = BUSY; 2016141Sgblack@eecs.umich.edu 2026141Sgblack@eecs.umich.edu return true; 2036141Sgblack@eecs.umich.edu} 2046141Sgblack@eecs.umich.edu 2056141Sgblack@eecs.umich.edutemplate <typename SrcType, typename DstType> 2066141Sgblack@eecs.umich.eduvoid 2076141Sgblack@eecs.umich.eduBaseXBar::Layer<SrcType,DstType>::succeededTiming(Tick busy_time) 2086141Sgblack@eecs.umich.edu{ 2096141Sgblack@eecs.umich.edu // we should have gone from idle or retry to busy in the tryTiming 2106141Sgblack@eecs.umich.edu // test 2116141Sgblack@eecs.umich.edu assert(state == BUSY); 2126141Sgblack@eecs.umich.edu 2136141Sgblack@eecs.umich.edu // occupy the layer accordingly 2146141Sgblack@eecs.umich.edu occupyLayer(busy_time); 2156141Sgblack@eecs.umich.edu} 2166141Sgblack@eecs.umich.edu 2176141Sgblack@eecs.umich.edutemplate <typename SrcType, typename DstType> 2186141Sgblack@eecs.umich.eduvoid 2196141Sgblack@eecs.umich.eduBaseXBar::Layer<SrcType,DstType>::failedTiming(SrcType* src_port, 2206141Sgblack@eecs.umich.edu Tick busy_time) 2216141Sgblack@eecs.umich.edu{ 2226141Sgblack@eecs.umich.edu // ensure no one got in between and tried to send something to 2236141Sgblack@eecs.umich.edu // this port 2246141Sgblack@eecs.umich.edu assert(waitingForPeer == NULL); 2256141Sgblack@eecs.umich.edu 2266141Sgblack@eecs.umich.edu // if the source port is the current retrying one or not, we have 2276141Sgblack@eecs.umich.edu // failed in forwarding and should track that we are now waiting 2286141Sgblack@eecs.umich.edu // for the peer to send a retry 2296141Sgblack@eecs.umich.edu waitingForPeer = src_port; 2306141Sgblack@eecs.umich.edu 2316141Sgblack@eecs.umich.edu // we should have gone from idle or retry to busy in the tryTiming 2326141Sgblack@eecs.umich.edu // test 2336141Sgblack@eecs.umich.edu assert(state == BUSY); 2346141Sgblack@eecs.umich.edu 2356141Sgblack@eecs.umich.edu // occupy the bus accordingly 2366141Sgblack@eecs.umich.edu occupyLayer(busy_time); 2376141Sgblack@eecs.umich.edu} 2386141Sgblack@eecs.umich.edu 2396141Sgblack@eecs.umich.edutemplate <typename SrcType, typename DstType> 2406141Sgblack@eecs.umich.eduvoid 2416141Sgblack@eecs.umich.eduBaseXBar::Layer<SrcType,DstType>::releaseLayer() 2426141Sgblack@eecs.umich.edu{ 2436141Sgblack@eecs.umich.edu // releasing the bus means we should now be idle 2446141Sgblack@eecs.umich.edu assert(state == BUSY); 2456141Sgblack@eecs.umich.edu assert(!releaseEvent.scheduled()); 2466141Sgblack@eecs.umich.edu 2476141Sgblack@eecs.umich.edu // update the state 2486141Sgblack@eecs.umich.edu state = IDLE; 2496141Sgblack@eecs.umich.edu 2506141Sgblack@eecs.umich.edu // bus layer is now idle, so if someone is waiting we can retry 2516141Sgblack@eecs.umich.edu if (!waitingForLayer.empty()) { 2526141Sgblack@eecs.umich.edu // there is no point in sending a retry if someone is still 2536141Sgblack@eecs.umich.edu // waiting for the peer 2546141Sgblack@eecs.umich.edu if (waitingForPeer == NULL) 2556141Sgblack@eecs.umich.edu retryWaiting(); 2566141Sgblack@eecs.umich.edu } else if (waitingForPeer == NULL && drainState() == DrainState::Draining) { 2576141Sgblack@eecs.umich.edu DPRINTF(Drain, "Crossbar done draining, signaling drain manager\n"); 2586141Sgblack@eecs.umich.edu //If we weren't able to drain before, do it now. 2596141Sgblack@eecs.umich.edu signalDrainDone(); 2606141Sgblack@eecs.umich.edu } 2616141Sgblack@eecs.umich.edu} 2626141Sgblack@eecs.umich.edu 2636141Sgblack@eecs.umich.edutemplate <typename SrcType, typename DstType> 2646141Sgblack@eecs.umich.eduvoid 2656141Sgblack@eecs.umich.eduBaseXBar::Layer<SrcType,DstType>::retryWaiting() 2666141Sgblack@eecs.umich.edu{ 2676141Sgblack@eecs.umich.edu // this should never be called with no one waiting 2686141Sgblack@eecs.umich.edu assert(!waitingForLayer.empty()); 2696141Sgblack@eecs.umich.edu 2706141Sgblack@eecs.umich.edu // we always go to retrying from idle 2716141Sgblack@eecs.umich.edu assert(state == IDLE); 2726141Sgblack@eecs.umich.edu 2736141Sgblack@eecs.umich.edu // update the state 2746141Sgblack@eecs.umich.edu state = RETRY; 2756141Sgblack@eecs.umich.edu 2766141Sgblack@eecs.umich.edu // set the retrying port to the front of the retry list and pop it 2776141Sgblack@eecs.umich.edu // off the list 2786141Sgblack@eecs.umich.edu SrcType* retryingPort = waitingForLayer.front(); 2796141Sgblack@eecs.umich.edu waitingForLayer.pop_front(); 2806141Sgblack@eecs.umich.edu 2816141Sgblack@eecs.umich.edu // tell the port to retry, which in some cases ends up calling the 2826141Sgblack@eecs.umich.edu // layer again 2836141Sgblack@eecs.umich.edu sendRetry(retryingPort); 2846141Sgblack@eecs.umich.edu 2856141Sgblack@eecs.umich.edu // If the layer is still in the retry state, sendTiming wasn't 2866141Sgblack@eecs.umich.edu // called in zero time (e.g. the cache does this when a writeback 2876141Sgblack@eecs.umich.edu // is squashed) 2886141Sgblack@eecs.umich.edu if (state == RETRY) { 2896141Sgblack@eecs.umich.edu // update the state to busy and reset the retrying port, we 2906141Sgblack@eecs.umich.edu // have done our bit and sent the retry 2916141Sgblack@eecs.umich.edu state = BUSY; 2926141Sgblack@eecs.umich.edu 2936141Sgblack@eecs.umich.edu // occupy the crossbar layer until the next clock edge 2946141Sgblack@eecs.umich.edu occupyLayer(xbar.clockEdge()); 2956141Sgblack@eecs.umich.edu } 2966141Sgblack@eecs.umich.edu} 2976141Sgblack@eecs.umich.edu 2986141Sgblack@eecs.umich.edutemplate <typename SrcType, typename DstType> 2996141Sgblack@eecs.umich.eduvoid 3006141Sgblack@eecs.umich.eduBaseXBar::Layer<SrcType,DstType>::recvRetry() 3016141Sgblack@eecs.umich.edu{ 3026141Sgblack@eecs.umich.edu // we should never get a retry without having failed to forward 3036141Sgblack@eecs.umich.edu // something to this port 3046141Sgblack@eecs.umich.edu assert(waitingForPeer != NULL); 3056141Sgblack@eecs.umich.edu 3066141Sgblack@eecs.umich.edu // add the port where the failed packet originated to the front of 3076141Sgblack@eecs.umich.edu // the waiting ports for the layer, this allows us to call retry 3086141Sgblack@eecs.umich.edu // on the port immediately if the crossbar layer is idle 3096141Sgblack@eecs.umich.edu waitingForLayer.push_front(waitingForPeer); 3106141Sgblack@eecs.umich.edu 3116141Sgblack@eecs.umich.edu // we are no longer waiting for the peer 3126141Sgblack@eecs.umich.edu waitingForPeer = NULL; 3136141Sgblack@eecs.umich.edu 3146141Sgblack@eecs.umich.edu // if the layer is idle, retry this port straight away, if we 3156141Sgblack@eecs.umich.edu // are busy, then simply let the port wait for its turn 3166141Sgblack@eecs.umich.edu if (state == IDLE) { 3176141Sgblack@eecs.umich.edu retryWaiting(); 3186141Sgblack@eecs.umich.edu } else { 3196141Sgblack@eecs.umich.edu assert(state == BUSY); 3206141Sgblack@eecs.umich.edu } 3216141Sgblack@eecs.umich.edu} 3226141Sgblack@eecs.umich.edu 3236141Sgblack@eecs.umich.eduPortID 3246141Sgblack@eecs.umich.eduBaseXBar::findPort(AddrRange addr_range) 3256141Sgblack@eecs.umich.edu{ 3266141Sgblack@eecs.umich.edu // we should never see any address lookups before we've got the 3276141Sgblack@eecs.umich.edu // ranges of all connected slave modules 3286141Sgblack@eecs.umich.edu assert(gotAllAddrRanges); 3296141Sgblack@eecs.umich.edu 3306141Sgblack@eecs.umich.edu // Check the address map interval tree 3316141Sgblack@eecs.umich.edu auto i = portMap.contains(addr_range); 3326141Sgblack@eecs.umich.edu if (i != portMap.end()) { 3336141Sgblack@eecs.umich.edu return i->second; 3346141Sgblack@eecs.umich.edu } 3356141Sgblack@eecs.umich.edu 3366141Sgblack@eecs.umich.edu // Check if this matches the default range 3376141Sgblack@eecs.umich.edu if (useDefaultRange) { 3386141Sgblack@eecs.umich.edu if (addr_range.isSubset(defaultRange)) { 3396141Sgblack@eecs.umich.edu DPRINTF(AddrRanges, " found addr %s on default\n", 3406141Sgblack@eecs.umich.edu addr_range.to_string()); 3416141Sgblack@eecs.umich.edu return defaultPortID; 3426141Sgblack@eecs.umich.edu } 3436141Sgblack@eecs.umich.edu } else if (defaultPortID != InvalidPortID) { 3446141Sgblack@eecs.umich.edu DPRINTF(AddrRanges, "Unable to find destination for %s, " 3456141Sgblack@eecs.umich.edu "will use default port\n", addr_range.to_string()); 3466141Sgblack@eecs.umich.edu return defaultPortID; 3476141Sgblack@eecs.umich.edu } 3486141Sgblack@eecs.umich.edu 3496141Sgblack@eecs.umich.edu // we should use the range for the default port and it did not 3506141Sgblack@eecs.umich.edu // match, or the default port is not set 3516141Sgblack@eecs.umich.edu fatal("Unable to find destination for %s on %s\n", addr_range.to_string(), 3526141Sgblack@eecs.umich.edu name()); 3536141Sgblack@eecs.umich.edu} 3546141Sgblack@eecs.umich.edu 3556141Sgblack@eecs.umich.edu/** Function called by the port when the crossbar is receiving a range change.*/ 3566141Sgblack@eecs.umich.eduvoid 3576141Sgblack@eecs.umich.eduBaseXBar::recvRangeChange(PortID master_port_id) 3586141Sgblack@eecs.umich.edu{ 3596141Sgblack@eecs.umich.edu DPRINTF(AddrRanges, "Received range change from slave port %s\n", 3606141Sgblack@eecs.umich.edu masterPorts[master_port_id]->getSlavePort().name()); 3616141Sgblack@eecs.umich.edu 3626141Sgblack@eecs.umich.edu // remember that we got a range from this master port and thus the 3636141Sgblack@eecs.umich.edu // connected slave module 3646141Sgblack@eecs.umich.edu gotAddrRanges[master_port_id] = true; 3656141Sgblack@eecs.umich.edu 3666141Sgblack@eecs.umich.edu // update the global flag 3676141Sgblack@eecs.umich.edu if (!gotAllAddrRanges) { 3686141Sgblack@eecs.umich.edu // take a logical AND of all the ports and see if we got 3696141Sgblack@eecs.umich.edu // ranges from everyone 3706141Sgblack@eecs.umich.edu gotAllAddrRanges = true; 3716141Sgblack@eecs.umich.edu std::vector<bool>::const_iterator r = gotAddrRanges.begin(); 3726141Sgblack@eecs.umich.edu while (gotAllAddrRanges && r != gotAddrRanges.end()) { 3736141Sgblack@eecs.umich.edu gotAllAddrRanges &= *r++; 3746141Sgblack@eecs.umich.edu } 3756141Sgblack@eecs.umich.edu if (gotAllAddrRanges) 3766141Sgblack@eecs.umich.edu DPRINTF(AddrRanges, "Got address ranges from all slaves\n"); 3776141Sgblack@eecs.umich.edu } 3786141Sgblack@eecs.umich.edu 3796141Sgblack@eecs.umich.edu // note that we could get the range from the default port at any 3806141Sgblack@eecs.umich.edu // point in time, and we cannot assume that the default range is 3816141Sgblack@eecs.umich.edu // set before the other ones are, so we do additional checks once 3826141Sgblack@eecs.umich.edu // all ranges are provided 3836141Sgblack@eecs.umich.edu if (master_port_id == defaultPortID) { 3846141Sgblack@eecs.umich.edu // only update if we are indeed checking ranges for the 3856141Sgblack@eecs.umich.edu // default port since the port might not have a valid range 3866141Sgblack@eecs.umich.edu // otherwise 3876141Sgblack@eecs.umich.edu if (useDefaultRange) { 3886141Sgblack@eecs.umich.edu AddrRangeList ranges = masterPorts[master_port_id]->getAddrRanges(); 3896141Sgblack@eecs.umich.edu 3906141Sgblack@eecs.umich.edu if (ranges.size() != 1) 3916141Sgblack@eecs.umich.edu fatal("Crossbar %s may only have a single default range", 3926141Sgblack@eecs.umich.edu name()); 3936141Sgblack@eecs.umich.edu 3946141Sgblack@eecs.umich.edu defaultRange = ranges.front(); 3956141Sgblack@eecs.umich.edu } 3966141Sgblack@eecs.umich.edu } else { 3976141Sgblack@eecs.umich.edu // the ports are allowed to update their address ranges 3986141Sgblack@eecs.umich.edu // dynamically, so remove any existing entries 3996141Sgblack@eecs.umich.edu if (gotAddrRanges[master_port_id]) { 4006141Sgblack@eecs.umich.edu for (auto p = portMap.begin(); p != portMap.end(); ) { 4016141Sgblack@eecs.umich.edu if (p->second == master_port_id) 4026141Sgblack@eecs.umich.edu // erasing invalidates the iterator, so advance it 4036141Sgblack@eecs.umich.edu // before the deletion takes place 4046141Sgblack@eecs.umich.edu portMap.erase(p++); 4056141Sgblack@eecs.umich.edu else 4066141Sgblack@eecs.umich.edu p++; 4076141Sgblack@eecs.umich.edu } 4086141Sgblack@eecs.umich.edu } 4096141Sgblack@eecs.umich.edu 4106141Sgblack@eecs.umich.edu AddrRangeList ranges = masterPorts[master_port_id]->getAddrRanges(); 4116141Sgblack@eecs.umich.edu 4126141Sgblack@eecs.umich.edu for (const auto& r: ranges) { 4136141Sgblack@eecs.umich.edu DPRINTF(AddrRanges, "Adding range %s for id %d\n", 4146141Sgblack@eecs.umich.edu r.to_string(), master_port_id); 4156141Sgblack@eecs.umich.edu if (portMap.insert(r, master_port_id) == portMap.end()) { 4166141Sgblack@eecs.umich.edu PortID conflict_id = portMap.intersects(r)->second; 4176141Sgblack@eecs.umich.edu fatal("%s has two ports responding within range " 4186141Sgblack@eecs.umich.edu "%s:\n\t%s\n\t%s\n", 4196141Sgblack@eecs.umich.edu name(), 4206141Sgblack@eecs.umich.edu r.to_string(), 4216141Sgblack@eecs.umich.edu masterPorts[master_port_id]->getSlavePort().name(), 4226141Sgblack@eecs.umich.edu masterPorts[conflict_id]->getSlavePort().name()); 4236141Sgblack@eecs.umich.edu } 4246141Sgblack@eecs.umich.edu } 4256141Sgblack@eecs.umich.edu } 4266141Sgblack@eecs.umich.edu 4276141Sgblack@eecs.umich.edu // if we have received ranges from all our neighbouring slave 4286141Sgblack@eecs.umich.edu // modules, go ahead and tell our connected master modules in 4296141Sgblack@eecs.umich.edu // turn, this effectively assumes a tree structure of the system 4306141Sgblack@eecs.umich.edu if (gotAllAddrRanges) { 4316141Sgblack@eecs.umich.edu DPRINTF(AddrRanges, "Aggregating address ranges\n"); 4326141Sgblack@eecs.umich.edu xbarRanges.clear(); 4336141Sgblack@eecs.umich.edu 4346141Sgblack@eecs.umich.edu // start out with the default range 4356141Sgblack@eecs.umich.edu if (useDefaultRange) { 4366141Sgblack@eecs.umich.edu if (!gotAddrRanges[defaultPortID]) 4376141Sgblack@eecs.umich.edu fatal("Crossbar %s uses default range, but none provided", 4386141Sgblack@eecs.umich.edu name()); 4396141Sgblack@eecs.umich.edu 4406141Sgblack@eecs.umich.edu xbarRanges.push_back(defaultRange); 4416141Sgblack@eecs.umich.edu DPRINTF(AddrRanges, "-- Adding default %s\n", 4426141Sgblack@eecs.umich.edu defaultRange.to_string()); 4436141Sgblack@eecs.umich.edu } 4446141Sgblack@eecs.umich.edu 4456141Sgblack@eecs.umich.edu // merge all interleaved ranges and add any range that is not 4466141Sgblack@eecs.umich.edu // a subset of the default range 4476141Sgblack@eecs.umich.edu std::vector<AddrRange> intlv_ranges; 4486141Sgblack@eecs.umich.edu for (const auto& r: portMap) { 4496141Sgblack@eecs.umich.edu // if the range is interleaved then save it for now 4506141Sgblack@eecs.umich.edu if (r.first.interleaved()) { 4516141Sgblack@eecs.umich.edu // if we already got interleaved ranges that are not 4526141Sgblack@eecs.umich.edu // part of the same range, then first do a merge 4536141Sgblack@eecs.umich.edu // before we add the new one 4546141Sgblack@eecs.umich.edu if (!intlv_ranges.empty() && 4556141Sgblack@eecs.umich.edu !intlv_ranges.back().mergesWith(r.first)) { 4566141Sgblack@eecs.umich.edu DPRINTF(AddrRanges, "-- Merging range from %d ranges\n", 4576141Sgblack@eecs.umich.edu intlv_ranges.size()); 4586141Sgblack@eecs.umich.edu AddrRange merged_range(intlv_ranges); 4596141Sgblack@eecs.umich.edu // next decide if we keep the merged range or not 4606141Sgblack@eecs.umich.edu if (!(useDefaultRange && 4616141Sgblack@eecs.umich.edu merged_range.isSubset(defaultRange))) { 4626141Sgblack@eecs.umich.edu xbarRanges.push_back(merged_range); 4636141Sgblack@eecs.umich.edu DPRINTF(AddrRanges, "-- Adding merged range %s\n", 4646141Sgblack@eecs.umich.edu merged_range.to_string()); 4656141Sgblack@eecs.umich.edu } 4666141Sgblack@eecs.umich.edu intlv_ranges.clear(); 4676141Sgblack@eecs.umich.edu } 4686141Sgblack@eecs.umich.edu intlv_ranges.push_back(r.first); 4696141Sgblack@eecs.umich.edu } else { 4706141Sgblack@eecs.umich.edu // keep the current range if not a subset of the default 4716141Sgblack@eecs.umich.edu if (!(useDefaultRange && 4726141Sgblack@eecs.umich.edu r.first.isSubset(defaultRange))) { 4736141Sgblack@eecs.umich.edu xbarRanges.push_back(r.first); 4746141Sgblack@eecs.umich.edu DPRINTF(AddrRanges, "-- Adding range %s\n", 4756141Sgblack@eecs.umich.edu r.first.to_string()); 4766141Sgblack@eecs.umich.edu } 4776141Sgblack@eecs.umich.edu } 4786141Sgblack@eecs.umich.edu } 4796141Sgblack@eecs.umich.edu 4806141Sgblack@eecs.umich.edu // if there is still interleaved ranges waiting to be merged, 4816141Sgblack@eecs.umich.edu // go ahead and do it 4826141Sgblack@eecs.umich.edu if (!intlv_ranges.empty()) { 4836141Sgblack@eecs.umich.edu DPRINTF(AddrRanges, "-- Merging range from %d ranges\n", 4846141Sgblack@eecs.umich.edu intlv_ranges.size()); 4856141Sgblack@eecs.umich.edu AddrRange merged_range(intlv_ranges); 4866141Sgblack@eecs.umich.edu if (!(useDefaultRange && merged_range.isSubset(defaultRange))) { 4876141Sgblack@eecs.umich.edu xbarRanges.push_back(merged_range); 4886141Sgblack@eecs.umich.edu DPRINTF(AddrRanges, "-- Adding merged range %s\n", 4896141Sgblack@eecs.umich.edu merged_range.to_string()); 4906141Sgblack@eecs.umich.edu } 4916141Sgblack@eecs.umich.edu } 4926141Sgblack@eecs.umich.edu 4936141Sgblack@eecs.umich.edu // also check that no range partially intersects with the 4946141Sgblack@eecs.umich.edu // default range, this has to be done after all ranges are set 4956141Sgblack@eecs.umich.edu // as there are no guarantees for when the default range is 4966141Sgblack@eecs.umich.edu // update with respect to the other ones 4976141Sgblack@eecs.umich.edu if (useDefaultRange) { 4986141Sgblack@eecs.umich.edu for (const auto& r: xbarRanges) { 4996141Sgblack@eecs.umich.edu // see if the new range is partially 5006141Sgblack@eecs.umich.edu // overlapping the default range 5016141Sgblack@eecs.umich.edu if (r.intersects(defaultRange) && 5026141Sgblack@eecs.umich.edu !r.isSubset(defaultRange)) 5036141Sgblack@eecs.umich.edu fatal("Range %s intersects the " \ 5046141Sgblack@eecs.umich.edu "default range of %s but is not a " \ 5056141Sgblack@eecs.umich.edu "subset\n", r.to_string(), name()); 5066141Sgblack@eecs.umich.edu } 5076141Sgblack@eecs.umich.edu } 5086141Sgblack@eecs.umich.edu 5096141Sgblack@eecs.umich.edu // tell all our neighbouring master ports that our address 5106141Sgblack@eecs.umich.edu // ranges have changed 5116141Sgblack@eecs.umich.edu for (const auto& s: slavePorts) 5126141Sgblack@eecs.umich.edu s->sendRangeChange(); 5136141Sgblack@eecs.umich.edu } 5146141Sgblack@eecs.umich.edu} 5156141Sgblack@eecs.umich.edu 5166141Sgblack@eecs.umich.eduAddrRangeList 5176141Sgblack@eecs.umich.eduBaseXBar::getAddrRanges() const 5186141Sgblack@eecs.umich.edu{ 5196141Sgblack@eecs.umich.edu // we should never be asked without first having sent a range 5206141Sgblack@eecs.umich.edu // change, and the latter is only done once we have all the ranges 5216141Sgblack@eecs.umich.edu // of the connected devices 5226141Sgblack@eecs.umich.edu assert(gotAllAddrRanges); 5236141Sgblack@eecs.umich.edu 5246141Sgblack@eecs.umich.edu // at the moment, this never happens, as there are no cycles in 5256141Sgblack@eecs.umich.edu // the range queries and no devices on the master side of a crossbar 5266141Sgblack@eecs.umich.edu // (CPU, cache, bridge etc) actually care about the ranges of the 5276141Sgblack@eecs.umich.edu // ports they are connected to 5286141Sgblack@eecs.umich.edu 5296141Sgblack@eecs.umich.edu DPRINTF(AddrRanges, "Received address range request\n"); 5306141Sgblack@eecs.umich.edu 5316141Sgblack@eecs.umich.edu return xbarRanges; 5326141Sgblack@eecs.umich.edu} 5336141Sgblack@eecs.umich.edu 5346141Sgblack@eecs.umich.eduvoid 5356141Sgblack@eecs.umich.eduBaseXBar::regStats() 5366141Sgblack@eecs.umich.edu{ 5376141Sgblack@eecs.umich.edu ClockedObject::regStats(); 5386141Sgblack@eecs.umich.edu 5396141Sgblack@eecs.umich.edu using namespace Stats; 5406141Sgblack@eecs.umich.edu 5416141Sgblack@eecs.umich.edu transDist 5426141Sgblack@eecs.umich.edu .init(MemCmd::NUM_MEM_CMDS) 5436141Sgblack@eecs.umich.edu .name(name() + ".trans_dist") 5446141Sgblack@eecs.umich.edu .desc("Transaction distribution") 5456141Sgblack@eecs.umich.edu .flags(nozero); 5466141Sgblack@eecs.umich.edu 5476141Sgblack@eecs.umich.edu // get the string representation of the commands 5486141Sgblack@eecs.umich.edu for (int i = 0; i < MemCmd::NUM_MEM_CMDS; i++) { 5496141Sgblack@eecs.umich.edu MemCmd cmd(i); 5506023Snate@binkert.org const std::string &cstr = cmd.toString(); 5516023Snate@binkert.org transDist.subname(i, cstr); 5525086Sgblack@eecs.umich.edu } 5536141Sgblack@eecs.umich.edu 5546141Sgblack@eecs.umich.edu pktCount 5556141Sgblack@eecs.umich.edu .init(slavePorts.size(), masterPorts.size()) 5566141Sgblack@eecs.umich.edu .name(name() + ".pkt_count") 5576141Sgblack@eecs.umich.edu .desc("Packet count per connected master and slave (bytes)") 5586141Sgblack@eecs.umich.edu .flags(total | nozero | nonan); 5596141Sgblack@eecs.umich.edu 5606141Sgblack@eecs.umich.edu pktSize 5616141Sgblack@eecs.umich.edu .init(slavePorts.size(), masterPorts.size()) 5626141Sgblack@eecs.umich.edu .name(name() + ".pkt_size") 5635895Sgblack@eecs.umich.edu .desc("Cumulative packet size per connected master and slave (bytes)") 5645124Sgblack@eecs.umich.edu .flags(total | nozero | nonan); 5655140Sgblack@eecs.umich.edu 5665140Sgblack@eecs.umich.edu // both the packet count and total size are two-dimensional 5676141Sgblack@eecs.umich.edu // vectors, indexed by slave port id and master port id, thus the 5685140Sgblack@eecs.umich.edu // neighbouring master and slave, they do not differentiate what 5695140Sgblack@eecs.umich.edu // came from the master and was forwarded to the slave (requests 5706141Sgblack@eecs.umich.edu // and snoop responses) and what came from the slave and was 5715237Sgblack@eecs.umich.edu // forwarded to the master (responses and snoop requests) 5725140Sgblack@eecs.umich.edu for (int i = 0; i < slavePorts.size(); i++) { 5736141Sgblack@eecs.umich.edu pktCount.subname(i, slavePorts[i]->getMasterPort().name()); 5745237Sgblack@eecs.umich.edu pktSize.subname(i, slavePorts[i]->getMasterPort().name()); 5755431Sgblack@eecs.umich.edu for (int j = 0; j < masterPorts.size(); j++) { 5766059Sgblack@eecs.umich.edu pktCount.ysubname(j, masterPorts[j]->getSlavePort().name()); 5776141Sgblack@eecs.umich.edu pktSize.ysubname(j, masterPorts[j]->getSlavePort().name()); 5786059Sgblack@eecs.umich.edu } 5795431Sgblack@eecs.umich.edu } 5805433Sgblack@eecs.umich.edu} 5815965Sgblack@eecs.umich.edu 5825433Sgblack@eecs.umich.edutemplate <typename SrcType, typename DstType> 5836099Sgblack@eecs.umich.eduDrainState 5845433Sgblack@eecs.umich.eduBaseXBar::Layer<SrcType,DstType>::drain() 5856023Snate@binkert.org{ 5865433Sgblack@eecs.umich.edu //We should check that we're not "doing" anything, and that noone is 5875433Sgblack@eecs.umich.edu //waiting. We might be idle but have someone waiting if the device we 5885965Sgblack@eecs.umich.edu //contacted for a retry didn't actually retry. 5895433Sgblack@eecs.umich.edu if (state != IDLE) { 5905140Sgblack@eecs.umich.edu DPRINTF(Drain, "Crossbar not drained\n"); 5915140Sgblack@eecs.umich.edu return DrainState::Draining; 5925965Sgblack@eecs.umich.edu } else { 5935965Sgblack@eecs.umich.edu return DrainState::Drained; 5945965Sgblack@eecs.umich.edu } 5955965Sgblack@eecs.umich.edu} 5966141Sgblack@eecs.umich.edu 5975980Snate@binkert.orgtemplate <typename SrcType, typename DstType> 5985980Snate@binkert.orgvoid 5995965Sgblack@eecs.umich.eduBaseXBar::Layer<SrcType,DstType>::regStats() 6005965Sgblack@eecs.umich.edu{ 6015965Sgblack@eecs.umich.edu using namespace Stats; 6025433Sgblack@eecs.umich.edu 6035237Sgblack@eecs.umich.edu occupancy 6045965Sgblack@eecs.umich.edu .name(name() + ".occupancy") 6055965Sgblack@eecs.umich.edu .desc("Layer occupancy (ticks)") 6065965Sgblack@eecs.umich.edu .flags(nozero); 6075140Sgblack@eecs.umich.edu 6085965Sgblack@eecs.umich.edu utilization 6095965Sgblack@eecs.umich.edu .name(name() + ".utilization") 6105140Sgblack@eecs.umich.edu .desc("Layer utilization (%)") 6115140Sgblack@eecs.umich.edu .precision(1) 6125140Sgblack@eecs.umich.edu .flags(nozero); 6136141Sgblack@eecs.umich.edu 6145237Sgblack@eecs.umich.edu utilization = 100 * occupancy / simTicks; 6155140Sgblack@eecs.umich.edu} 6165140Sgblack@eecs.umich.edu 6175140Sgblack@eecs.umich.edu/** 6185895Sgblack@eecs.umich.edu * Crossbar layer template instantiations. Could be removed with _impl.hh 6196023Snate@binkert.org * file, but since there are only two given options (MasterPort and 6205895Sgblack@eecs.umich.edu * SlavePort) it seems a bit excessive at this point. 6215895Sgblack@eecs.umich.edu */ 6225895Sgblack@eecs.umich.edutemplate class BaseXBar::Layer<SlavePort,MasterPort>; 6235895Sgblack@eecs.umich.edutemplate class BaseXBar::Layer<MasterPort,SlavePort>; 6245895Sgblack@eecs.umich.edu