noncoherent_xbar.cc revision 12334:e0ab29a34764
110447Snilay@cs.wisc.edu/* 210447Snilay@cs.wisc.edu * Copyright (c) 2011-2015 ARM Limited 310447Snilay@cs.wisc.edu * All rights reserved 410447Snilay@cs.wisc.edu * 510447Snilay@cs.wisc.edu * The license below extends only to copyright in the software and shall 610447Snilay@cs.wisc.edu * not be construed as granting a license to any other intellectual 710447Snilay@cs.wisc.edu * property including but not limited to intellectual property relating 810447Snilay@cs.wisc.edu * to a hardware implementation of the functionality of the software 910447Snilay@cs.wisc.edu * licensed hereunder. You may use the software subject to the license 1010447Snilay@cs.wisc.edu * terms below provided that you ensure that this notice is replicated 1110447Snilay@cs.wisc.edu * unmodified and in its entirety in all distributions of the software, 1210447Snilay@cs.wisc.edu * modified or unmodified, in source code or in binary form. 1310447Snilay@cs.wisc.edu * 1410447Snilay@cs.wisc.edu * Copyright (c) 2006 The Regents of The University of Michigan 1510447Snilay@cs.wisc.edu * All rights reserved. 1610447Snilay@cs.wisc.edu * 1710447Snilay@cs.wisc.edu * Redistribution and use in source and binary forms, with or without 1810447Snilay@cs.wisc.edu * modification, are permitted provided that the following conditions are 1910447Snilay@cs.wisc.edu * met: redistributions of source code must retain the above copyright 2010447Snilay@cs.wisc.edu * notice, this list of conditions and the following disclaimer; 2110447Snilay@cs.wisc.edu * redistributions in binary form must reproduce the above copyright 2210447Snilay@cs.wisc.edu * notice, this list of conditions and the following disclaimer in the 2310447Snilay@cs.wisc.edu * documentation and/or other materials provided with the distribution; 2410447Snilay@cs.wisc.edu * neither the name of the copyright holders nor the names of its 2510447Snilay@cs.wisc.edu * contributors may be used to endorse or promote products derived from 2610447Snilay@cs.wisc.edu * this software without specific prior written permission. 2710447Snilay@cs.wisc.edu * 2810447Snilay@cs.wisc.edu * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 2910447Snilay@cs.wisc.edu * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 3010447Snilay@cs.wisc.edu * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 3110447Snilay@cs.wisc.edu * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 3210447Snilay@cs.wisc.edu * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 3310447Snilay@cs.wisc.edu * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 3410447Snilay@cs.wisc.edu * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 3510447Snilay@cs.wisc.edu * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 3610447Snilay@cs.wisc.edu * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 3710447Snilay@cs.wisc.edu * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 3810447Snilay@cs.wisc.edu * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 3910447Snilay@cs.wisc.edu * 4010447Snilay@cs.wisc.edu * Authors: Ali Saidi 4110447Snilay@cs.wisc.edu * Andreas Hansson 4210447Snilay@cs.wisc.edu * William Wang 4310447Snilay@cs.wisc.edu */ 4410447Snilay@cs.wisc.edu 4510447Snilay@cs.wisc.edu/** 4610447Snilay@cs.wisc.edu * @file 4710447Snilay@cs.wisc.edu * Definition of a non-coherent crossbar object. 4810447Snilay@cs.wisc.edu */ 4910447Snilay@cs.wisc.edu 5010447Snilay@cs.wisc.edu#include "mem/noncoherent_xbar.hh" 5110447Snilay@cs.wisc.edu 5210447Snilay@cs.wisc.edu#include "base/logging.hh" 5310447Snilay@cs.wisc.edu#include "base/trace.hh" 5410447Snilay@cs.wisc.edu#include "debug/NoncoherentXBar.hh" 5510447Snilay@cs.wisc.edu#include "debug/XBar.hh" 5610447Snilay@cs.wisc.edu 5710447Snilay@cs.wisc.eduNoncoherentXBar::NoncoherentXBar(const NoncoherentXBarParams *p) 5810447Snilay@cs.wisc.edu : BaseXBar(p) 5910447Snilay@cs.wisc.edu{ 6010447Snilay@cs.wisc.edu // create the ports based on the size of the master and slave 6110447Snilay@cs.wisc.edu // vector ports, and the presence of the default port, the ports 6210447Snilay@cs.wisc.edu // are enumerated starting from zero 6310447Snilay@cs.wisc.edu for (int i = 0; i < p->port_master_connection_count; ++i) { 6410447Snilay@cs.wisc.edu std::string portName = csprintf("%s.master[%d]", name(), i); 6510447Snilay@cs.wisc.edu MasterPort* bp = new NoncoherentXBarMasterPort(portName, *this, i); 6610447Snilay@cs.wisc.edu masterPorts.push_back(bp); 6710447Snilay@cs.wisc.edu reqLayers.push_back(new ReqLayer(*bp, *this, 6810447Snilay@cs.wisc.edu csprintf(".reqLayer%d", i))); 6910447Snilay@cs.wisc.edu } 7010447Snilay@cs.wisc.edu 7110447Snilay@cs.wisc.edu // see if we have a default slave device connected and if so add 7210447Snilay@cs.wisc.edu // our corresponding master port 7310447Snilay@cs.wisc.edu if (p->port_default_connection_count) { 7410447Snilay@cs.wisc.edu defaultPortID = masterPorts.size(); 7510447Snilay@cs.wisc.edu std::string portName = name() + ".default"; 7610447Snilay@cs.wisc.edu MasterPort* bp = new NoncoherentXBarMasterPort(portName, *this, 7710447Snilay@cs.wisc.edu defaultPortID); 7810447Snilay@cs.wisc.edu masterPorts.push_back(bp); 7910447Snilay@cs.wisc.edu reqLayers.push_back(new ReqLayer(*bp, *this, csprintf(".reqLayer%d", 8010447Snilay@cs.wisc.edu defaultPortID))); 8110447Snilay@cs.wisc.edu } 8210447Snilay@cs.wisc.edu 8310447Snilay@cs.wisc.edu // create the slave ports, once again starting at zero 8410447Snilay@cs.wisc.edu for (int i = 0; i < p->port_slave_connection_count; ++i) { 8510447Snilay@cs.wisc.edu std::string portName = csprintf("%s.slave[%d]", name(), i); 8610447Snilay@cs.wisc.edu QueuedSlavePort* bp = new NoncoherentXBarSlavePort(portName, *this, i); 8710447Snilay@cs.wisc.edu slavePorts.push_back(bp); 8810447Snilay@cs.wisc.edu respLayers.push_back(new RespLayer(*bp, *this, 8910447Snilay@cs.wisc.edu csprintf(".respLayer%d", i))); 9010447Snilay@cs.wisc.edu } 9110447Snilay@cs.wisc.edu 9210447Snilay@cs.wisc.edu clearPortCache(); 9310447Snilay@cs.wisc.edu} 9410447Snilay@cs.wisc.edu 9510447Snilay@cs.wisc.eduNoncoherentXBar::~NoncoherentXBar() 9610447Snilay@cs.wisc.edu{ 9710447Snilay@cs.wisc.edu for (auto l: reqLayers) 9810447Snilay@cs.wisc.edu delete l; 9910447Snilay@cs.wisc.edu for (auto l: respLayers) 10010447Snilay@cs.wisc.edu delete l; 10110447Snilay@cs.wisc.edu} 10210447Snilay@cs.wisc.edu 10310447Snilay@cs.wisc.edubool 10410447Snilay@cs.wisc.eduNoncoherentXBar::recvTimingReq(PacketPtr pkt, PortID slave_port_id) 10510447Snilay@cs.wisc.edu{ 10610447Snilay@cs.wisc.edu // determine the source port based on the id 10710447Snilay@cs.wisc.edu SlavePort *src_port = slavePorts[slave_port_id]; 10810447Snilay@cs.wisc.edu 10910447Snilay@cs.wisc.edu // we should never see express snoops on a non-coherent crossbar 11010447Snilay@cs.wisc.edu assert(!pkt->isExpressSnoop()); 11110447Snilay@cs.wisc.edu 11210447Snilay@cs.wisc.edu // determine the destination based on the address 11310447Snilay@cs.wisc.edu PortID master_port_id = findPort(pkt->getAddr()); 11410447Snilay@cs.wisc.edu 11510447Snilay@cs.wisc.edu // test if the layer should be considered occupied for the current 11610447Snilay@cs.wisc.edu // port 11710447Snilay@cs.wisc.edu if (!reqLayers[master_port_id]->tryTiming(src_port)) { 11810447Snilay@cs.wisc.edu DPRINTF(NoncoherentXBar, "recvTimingReq: src %s %s 0x%x BUSY\n", 11910447Snilay@cs.wisc.edu src_port->name(), pkt->cmdString(), pkt->getAddr()); 12010447Snilay@cs.wisc.edu return false; 12110447Snilay@cs.wisc.edu } 12210447Snilay@cs.wisc.edu 12310447Snilay@cs.wisc.edu DPRINTF(NoncoherentXBar, "recvTimingReq: src %s %s 0x%x\n", 12410447Snilay@cs.wisc.edu src_port->name(), pkt->cmdString(), pkt->getAddr()); 12510447Snilay@cs.wisc.edu 12610447Snilay@cs.wisc.edu // store size and command as they might be modified when 12710447Snilay@cs.wisc.edu // forwarding the packet 12810447Snilay@cs.wisc.edu unsigned int pkt_size = pkt->hasData() ? pkt->getSize() : 0; 12910447Snilay@cs.wisc.edu unsigned int pkt_cmd = pkt->cmdToIndex(); 13010447Snilay@cs.wisc.edu 13110447Snilay@cs.wisc.edu // store the old header delay so we can restore it if needed 13210447Snilay@cs.wisc.edu Tick old_header_delay = pkt->headerDelay; 13310447Snilay@cs.wisc.edu 13410447Snilay@cs.wisc.edu // a request sees the frontend and forward latency 13510447Snilay@cs.wisc.edu Tick xbar_delay = (frontendLatency + forwardLatency) * clockPeriod(); 13610447Snilay@cs.wisc.edu 13710447Snilay@cs.wisc.edu // set the packet header and payload delay 13810447Snilay@cs.wisc.edu calcPacketTiming(pkt, xbar_delay); 13910447Snilay@cs.wisc.edu 14010447Snilay@cs.wisc.edu // determine how long to be crossbar layer is busy 14110447Snilay@cs.wisc.edu Tick packetFinishTime = clockEdge(Cycles(1)) + pkt->payloadDelay; 14210447Snilay@cs.wisc.edu 14310447Snilay@cs.wisc.edu // before forwarding the packet (and possibly altering it), 14410447Snilay@cs.wisc.edu // remember if we are expecting a response 14510447Snilay@cs.wisc.edu const bool expect_response = pkt->needsResponse() && 14610447Snilay@cs.wisc.edu !pkt->cacheResponding(); 14710447Snilay@cs.wisc.edu 14810447Snilay@cs.wisc.edu // since it is a normal request, attempt to send the packet 14910447Snilay@cs.wisc.edu bool success = masterPorts[master_port_id]->sendTimingReq(pkt); 15010447Snilay@cs.wisc.edu 15110447Snilay@cs.wisc.edu if (!success) { 15210447Snilay@cs.wisc.edu DPRINTF(NoncoherentXBar, "recvTimingReq: src %s %s 0x%x RETRY\n", 15310447Snilay@cs.wisc.edu src_port->name(), pkt->cmdString(), pkt->getAddr()); 15410447Snilay@cs.wisc.edu 15510447Snilay@cs.wisc.edu // restore the header delay as it is additive 15610447Snilay@cs.wisc.edu pkt->headerDelay = old_header_delay; 15710447Snilay@cs.wisc.edu 15810447Snilay@cs.wisc.edu // occupy until the header is sent 15910447Snilay@cs.wisc.edu reqLayers[master_port_id]->failedTiming(src_port, 16010447Snilay@cs.wisc.edu clockEdge(Cycles(1))); 16110447Snilay@cs.wisc.edu 16210447Snilay@cs.wisc.edu return false; 16310447Snilay@cs.wisc.edu } 16410447Snilay@cs.wisc.edu 16510447Snilay@cs.wisc.edu // remember where to route the response to 16610447Snilay@cs.wisc.edu if (expect_response) { 16710447Snilay@cs.wisc.edu assert(routeTo.find(pkt->req) == routeTo.end()); 16810447Snilay@cs.wisc.edu routeTo[pkt->req] = slave_port_id; 16910447Snilay@cs.wisc.edu } 17010447Snilay@cs.wisc.edu 17110447Snilay@cs.wisc.edu reqLayers[master_port_id]->succeededTiming(packetFinishTime); 17210447Snilay@cs.wisc.edu 17310447Snilay@cs.wisc.edu // stats updates 17410447Snilay@cs.wisc.edu pktCount[slave_port_id][master_port_id]++; 17510447Snilay@cs.wisc.edu pktSize[slave_port_id][master_port_id] += pkt_size; 17610447Snilay@cs.wisc.edu transDist[pkt_cmd]++; 17710447Snilay@cs.wisc.edu 17810447Snilay@cs.wisc.edu return true; 17910447Snilay@cs.wisc.edu} 18010447Snilay@cs.wisc.edu 18110447Snilay@cs.wisc.edubool 18210447Snilay@cs.wisc.eduNoncoherentXBar::recvTimingResp(PacketPtr pkt, PortID master_port_id) 18310447Snilay@cs.wisc.edu{ 18410447Snilay@cs.wisc.edu // determine the source port based on the id 18510447Snilay@cs.wisc.edu MasterPort *src_port = masterPorts[master_port_id]; 18610447Snilay@cs.wisc.edu 18710447Snilay@cs.wisc.edu // determine the destination 18810447Snilay@cs.wisc.edu const auto route_lookup = routeTo.find(pkt->req); 18910447Snilay@cs.wisc.edu assert(route_lookup != routeTo.end()); 19010447Snilay@cs.wisc.edu const PortID slave_port_id = route_lookup->second; 19110447Snilay@cs.wisc.edu assert(slave_port_id != InvalidPortID); 19210447Snilay@cs.wisc.edu assert(slave_port_id < respLayers.size()); 19310447Snilay@cs.wisc.edu 19410447Snilay@cs.wisc.edu // test if the layer should be considered occupied for the current 19510447Snilay@cs.wisc.edu // port 19610447Snilay@cs.wisc.edu if (!respLayers[slave_port_id]->tryTiming(src_port)) { 19710447Snilay@cs.wisc.edu DPRINTF(NoncoherentXBar, "recvTimingResp: src %s %s 0x%x BUSY\n", 19810447Snilay@cs.wisc.edu src_port->name(), pkt->cmdString(), pkt->getAddr()); 19910447Snilay@cs.wisc.edu return false; 20010447Snilay@cs.wisc.edu } 20110447Snilay@cs.wisc.edu 20210447Snilay@cs.wisc.edu DPRINTF(NoncoherentXBar, "recvTimingResp: src %s %s 0x%x\n", 20310447Snilay@cs.wisc.edu src_port->name(), pkt->cmdString(), pkt->getAddr()); 20410447Snilay@cs.wisc.edu 20510447Snilay@cs.wisc.edu // store size and command as they might be modified when 20610447Snilay@cs.wisc.edu // forwarding the packet 20710447Snilay@cs.wisc.edu unsigned int pkt_size = pkt->hasData() ? pkt->getSize() : 0; 20810447Snilay@cs.wisc.edu unsigned int pkt_cmd = pkt->cmdToIndex(); 20910447Snilay@cs.wisc.edu 21010447Snilay@cs.wisc.edu // a response sees the response latency 21110447Snilay@cs.wisc.edu Tick xbar_delay = responseLatency * clockPeriod(); 21210447Snilay@cs.wisc.edu 21310447Snilay@cs.wisc.edu // set the packet header and payload delay 21410447Snilay@cs.wisc.edu calcPacketTiming(pkt, xbar_delay); 21510447Snilay@cs.wisc.edu 21610447Snilay@cs.wisc.edu // determine how long to be crossbar layer is busy 21710447Snilay@cs.wisc.edu Tick packetFinishTime = clockEdge(Cycles(1)) + pkt->payloadDelay; 21810447Snilay@cs.wisc.edu 21910447Snilay@cs.wisc.edu // send the packet through the destination slave port, and pay for 22010447Snilay@cs.wisc.edu // any outstanding latency 22110447Snilay@cs.wisc.edu Tick latency = pkt->headerDelay; 22210447Snilay@cs.wisc.edu pkt->headerDelay = 0; 22310447Snilay@cs.wisc.edu slavePorts[slave_port_id]->schedTimingResp(pkt, curTick() + latency); 22410447Snilay@cs.wisc.edu 22510447Snilay@cs.wisc.edu // remove the request from the routing table 22610447Snilay@cs.wisc.edu routeTo.erase(route_lookup); 22710447Snilay@cs.wisc.edu 22810447Snilay@cs.wisc.edu respLayers[slave_port_id]->succeededTiming(packetFinishTime); 22910447Snilay@cs.wisc.edu 23010447Snilay@cs.wisc.edu // stats updates 23110447Snilay@cs.wisc.edu pktCount[slave_port_id][master_port_id]++; 23210447Snilay@cs.wisc.edu pktSize[slave_port_id][master_port_id] += pkt_size; 23310447Snilay@cs.wisc.edu transDist[pkt_cmd]++; 23410447Snilay@cs.wisc.edu 23510447Snilay@cs.wisc.edu return true; 23610447Snilay@cs.wisc.edu} 23710447Snilay@cs.wisc.edu 23810447Snilay@cs.wisc.eduvoid 23910447Snilay@cs.wisc.eduNoncoherentXBar::recvReqRetry(PortID master_port_id) 24010447Snilay@cs.wisc.edu{ 24110447Snilay@cs.wisc.edu // responses never block on forwarding them, so the retry will 24210447Snilay@cs.wisc.edu // always be coming from a port to which we tried to forward a 24310447Snilay@cs.wisc.edu // request 24410447Snilay@cs.wisc.edu reqLayers[master_port_id]->recvRetry(); 24510447Snilay@cs.wisc.edu} 24610447Snilay@cs.wisc.edu 24710447Snilay@cs.wisc.eduTick 24810447Snilay@cs.wisc.eduNoncoherentXBar::recvAtomic(PacketPtr pkt, PortID slave_port_id) 24910447Snilay@cs.wisc.edu{ 25010447Snilay@cs.wisc.edu DPRINTF(NoncoherentXBar, "recvAtomic: packet src %s addr 0x%x cmd %s\n", 25110447Snilay@cs.wisc.edu slavePorts[slave_port_id]->name(), pkt->getAddr(), 25210447Snilay@cs.wisc.edu pkt->cmdString()); 25310447Snilay@cs.wisc.edu 25410447Snilay@cs.wisc.edu unsigned int pkt_size = pkt->hasData() ? pkt->getSize() : 0; 25510447Snilay@cs.wisc.edu unsigned int pkt_cmd = pkt->cmdToIndex(); 25610447Snilay@cs.wisc.edu 25710447Snilay@cs.wisc.edu // determine the destination port 25810447Snilay@cs.wisc.edu PortID master_port_id = findPort(pkt->getAddr()); 25910447Snilay@cs.wisc.edu 26010447Snilay@cs.wisc.edu // stats updates for the request 26110447Snilay@cs.wisc.edu pktCount[slave_port_id][master_port_id]++; 26210447Snilay@cs.wisc.edu pktSize[slave_port_id][master_port_id] += pkt_size; 26310447Snilay@cs.wisc.edu transDist[pkt_cmd]++; 26410447Snilay@cs.wisc.edu 26510447Snilay@cs.wisc.edu // forward the request to the appropriate destination 26610447Snilay@cs.wisc.edu Tick response_latency = masterPorts[master_port_id]->sendAtomic(pkt); 26710447Snilay@cs.wisc.edu 26810447Snilay@cs.wisc.edu // add the response data 26910447Snilay@cs.wisc.edu if (pkt->isResponse()) { 27010447Snilay@cs.wisc.edu pkt_size = pkt->hasData() ? pkt->getSize() : 0; 27110447Snilay@cs.wisc.edu pkt_cmd = pkt->cmdToIndex(); 27210447Snilay@cs.wisc.edu 27310447Snilay@cs.wisc.edu // stats updates 27410447Snilay@cs.wisc.edu pktCount[slave_port_id][master_port_id]++; 27510447Snilay@cs.wisc.edu pktSize[slave_port_id][master_port_id] += pkt_size; 27610447Snilay@cs.wisc.edu transDist[pkt_cmd]++; 27710447Snilay@cs.wisc.edu } 27810447Snilay@cs.wisc.edu 27910447Snilay@cs.wisc.edu // @todo: Not setting first-word time 28010447Snilay@cs.wisc.edu pkt->payloadDelay = response_latency; 28110447Snilay@cs.wisc.edu return response_latency; 28210447Snilay@cs.wisc.edu} 28310447Snilay@cs.wisc.edu 28410447Snilay@cs.wisc.eduvoid 28510447Snilay@cs.wisc.eduNoncoherentXBar::recvFunctional(PacketPtr pkt, PortID slave_port_id) 28610447Snilay@cs.wisc.edu{ 28710447Snilay@cs.wisc.edu if (!pkt->isPrint()) { 28810447Snilay@cs.wisc.edu // don't do DPRINTFs on PrintReq as it clutters up the output 28910447Snilay@cs.wisc.edu DPRINTF(NoncoherentXBar, 29010447Snilay@cs.wisc.edu "recvFunctional: packet src %s addr 0x%x cmd %s\n", 29110447Snilay@cs.wisc.edu slavePorts[slave_port_id]->name(), pkt->getAddr(), 29210447Snilay@cs.wisc.edu pkt->cmdString()); 29310447Snilay@cs.wisc.edu } 29410447Snilay@cs.wisc.edu 29510447Snilay@cs.wisc.edu // since our slave ports are queued ports we need to check them as well 29610447Snilay@cs.wisc.edu for (const auto& p : slavePorts) { 29710447Snilay@cs.wisc.edu // if we find a response that has the data, then the 29810447Snilay@cs.wisc.edu // downstream caches/memories may be out of date, so simply stop 29910447Snilay@cs.wisc.edu // here 30010447Snilay@cs.wisc.edu if (p->checkFunctional(pkt)) { 30110447Snilay@cs.wisc.edu if (pkt->needsResponse()) 30210447Snilay@cs.wisc.edu pkt->makeResponse(); 30310447Snilay@cs.wisc.edu return; 30410447Snilay@cs.wisc.edu } 30510447Snilay@cs.wisc.edu } 30610447Snilay@cs.wisc.edu 30710447Snilay@cs.wisc.edu // determine the destination port 30810447Snilay@cs.wisc.edu PortID dest_id = findPort(pkt->getAddr()); 30910447Snilay@cs.wisc.edu 31010447Snilay@cs.wisc.edu // forward the request to the appropriate destination 31110447Snilay@cs.wisc.edu masterPorts[dest_id]->sendFunctional(pkt); 31210447Snilay@cs.wisc.edu} 31310447Snilay@cs.wisc.edu 31410447Snilay@cs.wisc.eduNoncoherentXBar* 31510447Snilay@cs.wisc.eduNoncoherentXBarParams::create() 31610447Snilay@cs.wisc.edu{ 31710447Snilay@cs.wisc.edu return new NoncoherentXBar(this); 31810447Snilay@cs.wisc.edu} 31910447Snilay@cs.wisc.edu 32010447Snilay@cs.wisc.eduvoid 32110447Snilay@cs.wisc.eduNoncoherentXBar::regStats() 32210447Snilay@cs.wisc.edu{ 32310447Snilay@cs.wisc.edu // register the stats of the base class and our layers 32410447Snilay@cs.wisc.edu BaseXBar::regStats(); 32510447Snilay@cs.wisc.edu for (auto l: reqLayers) 32610447Snilay@cs.wisc.edu l->regStats(); 32710447Snilay@cs.wisc.edu for (auto l: respLayers) 32810447Snilay@cs.wisc.edu l->regStats(); 32910447Snilay@cs.wisc.edu} 33010447Snilay@cs.wisc.edu