snoop_filter.cc revision 11744
110399Sstephan.diestelhorst@arm.com/* 211603Sandreas.hansson@arm.com * Copyright (c) 2013-2016 ARM Limited 310399Sstephan.diestelhorst@arm.com * All rights reserved 410399Sstephan.diestelhorst@arm.com * 510399Sstephan.diestelhorst@arm.com * The license below extends only to copyright in the software and shall 610399Sstephan.diestelhorst@arm.com * not be construed as granting a license to any other intellectual 710399Sstephan.diestelhorst@arm.com * property including but not limited to intellectual property relating 810399Sstephan.diestelhorst@arm.com * to a hardware implementation of the functionality of the software 910399Sstephan.diestelhorst@arm.com * licensed hereunder. You may use the software subject to the license 1010399Sstephan.diestelhorst@arm.com * terms below provided that you ensure that this notice is replicated 1110399Sstephan.diestelhorst@arm.com * unmodified and in its entirety in all distributions of the software, 1210399Sstephan.diestelhorst@arm.com * modified or unmodified, in source code or in binary form. 1310399Sstephan.diestelhorst@arm.com * 1410399Sstephan.diestelhorst@arm.com * Redistribution and use in source and binary forms, with or without 1510399Sstephan.diestelhorst@arm.com * modification, are permitted provided that the following conditions are 1610399Sstephan.diestelhorst@arm.com * met: redistributions of source code must retain the above copyright 1710399Sstephan.diestelhorst@arm.com * notice, this list of conditions and the following disclaimer; 1810399Sstephan.diestelhorst@arm.com * redistributions in binary form must reproduce the above copyright 1910399Sstephan.diestelhorst@arm.com * notice, this list of conditions and the following disclaimer in the 2010399Sstephan.diestelhorst@arm.com * documentation and/or other materials provided with the distribution; 2110399Sstephan.diestelhorst@arm.com * neither the name of the copyright holders nor the names of its 2210399Sstephan.diestelhorst@arm.com * contributors may be used to endorse or promote products derived from 2310399Sstephan.diestelhorst@arm.com * this software without specific prior written permission. 2410399Sstephan.diestelhorst@arm.com * 2510399Sstephan.diestelhorst@arm.com * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 2610399Sstephan.diestelhorst@arm.com * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 2710399Sstephan.diestelhorst@arm.com * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 2810399Sstephan.diestelhorst@arm.com * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 2910399Sstephan.diestelhorst@arm.com * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 3010399Sstephan.diestelhorst@arm.com * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 3110399Sstephan.diestelhorst@arm.com * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 3210399Sstephan.diestelhorst@arm.com * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 3310399Sstephan.diestelhorst@arm.com * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 3410399Sstephan.diestelhorst@arm.com * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 3510399Sstephan.diestelhorst@arm.com * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 3610399Sstephan.diestelhorst@arm.com * 3711135Sandreas.hansson@arm.com * Authors: Stephan Diestelhorst 3810399Sstephan.diestelhorst@arm.com */ 3910399Sstephan.diestelhorst@arm.com 4010399Sstephan.diestelhorst@arm.com/** 4110399Sstephan.diestelhorst@arm.com * @file 4211135Sandreas.hansson@arm.com * Implementation of a snoop filter. 4310399Sstephan.diestelhorst@arm.com */ 4410399Sstephan.diestelhorst@arm.com 4510399Sstephan.diestelhorst@arm.com#include "base/misc.hh" 4610399Sstephan.diestelhorst@arm.com#include "base/trace.hh" 4710399Sstephan.diestelhorst@arm.com#include "debug/SnoopFilter.hh" 4810399Sstephan.diestelhorst@arm.com#include "mem/snoop_filter.hh" 4910399Sstephan.diestelhorst@arm.com#include "sim/system.hh" 5010399Sstephan.diestelhorst@arm.com 5111129Sali.jafri@arm.comvoid 5211129Sali.jafri@arm.comSnoopFilter::eraseIfNullEntry(SnoopFilterCache::iterator& sf_it) 5311129Sali.jafri@arm.com{ 5411129Sali.jafri@arm.com SnoopItem& sf_item = sf_it->second; 5511129Sali.jafri@arm.com if (!(sf_item.requested | sf_item.holder)) { 5611129Sali.jafri@arm.com cachedLocations.erase(sf_it); 5711129Sali.jafri@arm.com DPRINTF(SnoopFilter, "%s: Removed SF entry.\n", 5811129Sali.jafri@arm.com __func__); 5911129Sali.jafri@arm.com } 6011129Sali.jafri@arm.com} 6111129Sali.jafri@arm.com 6210399Sstephan.diestelhorst@arm.comstd::pair<SnoopFilter::SnoopList, Cycles> 6310399Sstephan.diestelhorst@arm.comSnoopFilter::lookupRequest(const Packet* cpkt, const SlavePort& slave_port) 6410399Sstephan.diestelhorst@arm.com{ 6511744Snikos.nikoleris@arm.com DPRINTF(SnoopFilter, "%s: src %s packet %s\n", __func__, 6611744Snikos.nikoleris@arm.com slave_port.name(), cpkt->print()); 6710399Sstephan.diestelhorst@arm.com 6811603Sandreas.hansson@arm.com // check if the packet came from a cache 6911603Sandreas.hansson@arm.com bool allocate = !cpkt->req->isUncacheable() && slave_port.isSnooping() && 7011603Sandreas.hansson@arm.com cpkt->fromCache(); 7111128Sali.jafri@arm.com Addr line_addr = cpkt->getBlockAddr(linesize); 7211605Snikos.nikoleris@arm.com if (cpkt->isSecure()) { 7311605Snikos.nikoleris@arm.com line_addr |= LineSecure; 7411605Snikos.nikoleris@arm.com } 7510399Sstephan.diestelhorst@arm.com SnoopMask req_port = portToMask(slave_port); 7611131Sandreas.hansson@arm.com reqLookupResult = cachedLocations.find(line_addr); 7711131Sandreas.hansson@arm.com bool is_hit = (reqLookupResult != cachedLocations.end()); 7811128Sali.jafri@arm.com 7911128Sali.jafri@arm.com // If the snoop filter has no entry, and we should not allocate, 8011128Sali.jafri@arm.com // do not create a new snoop filter entry, simply return a NULL 8111128Sali.jafri@arm.com // portlist. 8211128Sali.jafri@arm.com if (!is_hit && !allocate) 8311128Sali.jafri@arm.com return snoopDown(lookupLatency); 8411128Sali.jafri@arm.com 8511131Sandreas.hansson@arm.com // If no hit in snoop filter create a new element and update iterator 8611131Sandreas.hansson@arm.com if (!is_hit) 8711131Sandreas.hansson@arm.com reqLookupResult = cachedLocations.emplace(line_addr, SnoopItem()).first; 8811131Sandreas.hansson@arm.com SnoopItem& sf_item = reqLookupResult->second; 8910403Sstephan.diestelhorst@arm.com SnoopMask interested = sf_item.holder | sf_item.requested; 9010403Sstephan.diestelhorst@arm.com 9111129Sali.jafri@arm.com // Store unmodified value of snoop filter item in temp storage in 9211129Sali.jafri@arm.com // case we need to revert because of a send retry in 9311129Sali.jafri@arm.com // updateRequest. 9411129Sali.jafri@arm.com retryItem = sf_item; 9511129Sali.jafri@arm.com 9610403Sstephan.diestelhorst@arm.com totRequests++; 9710403Sstephan.diestelhorst@arm.com if (is_hit) { 9810403Sstephan.diestelhorst@arm.com // Single bit set -> value is a power of two 9910403Sstephan.diestelhorst@arm.com if (isPow2(interested)) 10010403Sstephan.diestelhorst@arm.com hitSingleRequests++; 10110403Sstephan.diestelhorst@arm.com else 10210403Sstephan.diestelhorst@arm.com hitMultiRequests++; 10310403Sstephan.diestelhorst@arm.com } 10410399Sstephan.diestelhorst@arm.com 10510399Sstephan.diestelhorst@arm.com DPRINTF(SnoopFilter, "%s: SF value %x.%x\n", 10610399Sstephan.diestelhorst@arm.com __func__, sf_item.requested, sf_item.holder); 10710399Sstephan.diestelhorst@arm.com 10811129Sali.jafri@arm.com // If we are not allocating, we are done 10911129Sali.jafri@arm.com if (!allocate) 11011129Sali.jafri@arm.com return snoopSelected(maskToPortList(interested & ~req_port), 11111129Sali.jafri@arm.com lookupLatency); 11211129Sali.jafri@arm.com 11311129Sali.jafri@arm.com if (cpkt->needsResponse()) { 11411284Sandreas.hansson@arm.com if (!cpkt->cacheResponding()) { 11510399Sstephan.diestelhorst@arm.com // Max one request per address per port 11611129Sali.jafri@arm.com panic_if(sf_item.requested & req_port, "double request :( " \ 11710399Sstephan.diestelhorst@arm.com "SF value %x.%x\n", sf_item.requested, sf_item.holder); 11810399Sstephan.diestelhorst@arm.com 11910399Sstephan.diestelhorst@arm.com // Mark in-flight requests to distinguish later on 12010399Sstephan.diestelhorst@arm.com sf_item.requested |= req_port; 12111129Sali.jafri@arm.com DPRINTF(SnoopFilter, "%s: new SF value %x.%x\n", 12211129Sali.jafri@arm.com __func__, sf_item.requested, sf_item.holder); 12310399Sstephan.diestelhorst@arm.com } else { 12410399Sstephan.diestelhorst@arm.com // NOTE: The memInhibit might have been asserted by a cache closer 12510399Sstephan.diestelhorst@arm.com // to the CPU, already -> the response will not be seen by this 12610399Sstephan.diestelhorst@arm.com // filter -> we do not need to keep the in-flight request, but make 12710399Sstephan.diestelhorst@arm.com // sure that we know that that cluster has a copy 12810399Sstephan.diestelhorst@arm.com panic_if(!(sf_item.holder & req_port), "Need to hold the value!"); 12911129Sali.jafri@arm.com DPRINTF(SnoopFilter, 13011129Sali.jafri@arm.com "%s: not marking request. SF value %x.%x\n", 13110399Sstephan.diestelhorst@arm.com __func__, sf_item.requested, sf_item.holder); 13210399Sstephan.diestelhorst@arm.com } 13311129Sali.jafri@arm.com } else { // if (!cpkt->needsResponse()) 13411199Sandreas.hansson@arm.com assert(cpkt->isEviction()); 13511129Sali.jafri@arm.com // make sure that the sender actually had the line 13611129Sali.jafri@arm.com panic_if(!(sf_item.holder & req_port), "requester %x is not a " \ 13711129Sali.jafri@arm.com "holder :( SF value %x.%x\n", req_port, 13811129Sali.jafri@arm.com sf_item.requested, sf_item.holder); 13911129Sali.jafri@arm.com // CleanEvicts and Writebacks -> the sender and all caches above 14011129Sali.jafri@arm.com // it may not have the line anymore. 14111129Sali.jafri@arm.com if (!cpkt->isBlockCached()) { 14211129Sali.jafri@arm.com sf_item.holder &= ~req_port; 14311129Sali.jafri@arm.com DPRINTF(SnoopFilter, "%s: new SF value %x.%x\n", 14411129Sali.jafri@arm.com __func__, sf_item.requested, sf_item.holder); 14511129Sali.jafri@arm.com } 14610399Sstephan.diestelhorst@arm.com } 14711129Sali.jafri@arm.com 14810403Sstephan.diestelhorst@arm.com return snoopSelected(maskToPortList(interested & ~req_port), lookupLatency); 14910399Sstephan.diestelhorst@arm.com} 15010399Sstephan.diestelhorst@arm.com 15110399Sstephan.diestelhorst@arm.comvoid 15211605Snikos.nikoleris@arm.comSnoopFilter::finishRequest(bool will_retry, Addr addr, bool is_secure) 15310399Sstephan.diestelhorst@arm.com{ 15411131Sandreas.hansson@arm.com if (reqLookupResult != cachedLocations.end()) { 15511131Sandreas.hansson@arm.com // since we rely on the caller, do a basic check to ensure 15611131Sandreas.hansson@arm.com // that finishRequest is being called following lookupRequest 15711605Snikos.nikoleris@arm.com Addr line_addr = (addr & ~(Addr(linesize - 1))); 15811605Snikos.nikoleris@arm.com if (is_secure) { 15911605Snikos.nikoleris@arm.com line_addr |= LineSecure; 16011605Snikos.nikoleris@arm.com } 16111605Snikos.nikoleris@arm.com assert(reqLookupResult->first == line_addr); 16211131Sandreas.hansson@arm.com if (will_retry) { 16311131Sandreas.hansson@arm.com // Undo any changes made in lookupRequest to the snoop filter 16411131Sandreas.hansson@arm.com // entry if the request will come again. retryItem holds 16511131Sandreas.hansson@arm.com // the previous value of the snoopfilter entry. 16611131Sandreas.hansson@arm.com reqLookupResult->second = retryItem; 16710399Sstephan.diestelhorst@arm.com 16811131Sandreas.hansson@arm.com DPRINTF(SnoopFilter, "%s: restored SF value %x.%x\n", 16911131Sandreas.hansson@arm.com __func__, retryItem.requested, retryItem.holder); 17011131Sandreas.hansson@arm.com } 17110821Sandreas.hansson@arm.com 17211131Sandreas.hansson@arm.com eraseIfNullEntry(reqLookupResult); 17310399Sstephan.diestelhorst@arm.com } 17410399Sstephan.diestelhorst@arm.com} 17510399Sstephan.diestelhorst@arm.com 17610399Sstephan.diestelhorst@arm.comstd::pair<SnoopFilter::SnoopList, Cycles> 17710399Sstephan.diestelhorst@arm.comSnoopFilter::lookupSnoop(const Packet* cpkt) 17810399Sstephan.diestelhorst@arm.com{ 17911744Snikos.nikoleris@arm.com DPRINTF(SnoopFilter, "%s: packet %s\n", __func__, cpkt->print()); 18010399Sstephan.diestelhorst@arm.com 18110399Sstephan.diestelhorst@arm.com assert(cpkt->isRequest()); 18210399Sstephan.diestelhorst@arm.com 18311128Sali.jafri@arm.com Addr line_addr = cpkt->getBlockAddr(linesize); 18411605Snikos.nikoleris@arm.com if (cpkt->isSecure()) { 18511605Snikos.nikoleris@arm.com line_addr |= LineSecure; 18611605Snikos.nikoleris@arm.com } 18710403Sstephan.diestelhorst@arm.com auto sf_it = cachedLocations.find(line_addr); 18810403Sstephan.diestelhorst@arm.com bool is_hit = (sf_it != cachedLocations.end()); 18911129Sali.jafri@arm.com 19011132Sali.jafri@arm.com panic_if(!is_hit && (cachedLocations.size() >= maxEntryCount), 19111132Sali.jafri@arm.com "snoop filter exceeded capacity of %d cache blocks\n", 19211132Sali.jafri@arm.com maxEntryCount); 19311132Sali.jafri@arm.com 19411134Sandreas.hansson@arm.com // If the snoop filter has no entry, simply return a NULL 19511134Sandreas.hansson@arm.com // portlist, there is no point creating an entry only to remove it 19611134Sandreas.hansson@arm.com // later 19711134Sandreas.hansson@arm.com if (!is_hit) 19811129Sali.jafri@arm.com return snoopDown(lookupLatency); 19911129Sali.jafri@arm.com 20011129Sali.jafri@arm.com SnoopItem& sf_item = sf_it->second; 20110399Sstephan.diestelhorst@arm.com 20210399Sstephan.diestelhorst@arm.com DPRINTF(SnoopFilter, "%s: old SF value %x.%x\n", 20310399Sstephan.diestelhorst@arm.com __func__, sf_item.requested, sf_item.holder); 20410399Sstephan.diestelhorst@arm.com 20510399Sstephan.diestelhorst@arm.com SnoopMask interested = (sf_item.holder | sf_item.requested); 20610403Sstephan.diestelhorst@arm.com 20710403Sstephan.diestelhorst@arm.com totSnoops++; 20811134Sandreas.hansson@arm.com // Single bit set -> value is a power of two 20911134Sandreas.hansson@arm.com if (isPow2(interested)) 21011134Sandreas.hansson@arm.com hitSingleSnoops++; 21111134Sandreas.hansson@arm.com else 21211134Sandreas.hansson@arm.com hitMultiSnoops++; 21311134Sandreas.hansson@arm.com 21410883Sali.jafri@arm.com // ReadEx and Writes require both invalidation and exlusivity, while reads 21510883Sali.jafri@arm.com // require neither. Writebacks on the other hand require exclusivity but 21610883Sali.jafri@arm.com // not the invalidation. Previously Writebacks did not generate upward 21710883Sali.jafri@arm.com // snoops so this was never an aissue. Now that Writebacks generate snoops 21810883Sali.jafri@arm.com // we need to special case for Writebacks. 21911199Sandreas.hansson@arm.com assert(cpkt->isWriteback() || cpkt->req->isUncacheable() || 22011284Sandreas.hansson@arm.com (cpkt->isInvalidate() == cpkt->needsWritable())); 22110399Sstephan.diestelhorst@arm.com if (cpkt->isInvalidate() && !sf_item.requested) { 22210399Sstephan.diestelhorst@arm.com // Early clear of the holder, if no other request is currently going on 22310399Sstephan.diestelhorst@arm.com // @todo: This should possibly be updated even though we do not filter 22410399Sstephan.diestelhorst@arm.com // upward snoops 22510399Sstephan.diestelhorst@arm.com sf_item.holder = 0; 22610399Sstephan.diestelhorst@arm.com } 22710399Sstephan.diestelhorst@arm.com 22811129Sali.jafri@arm.com eraseIfNullEntry(sf_it); 22910399Sstephan.diestelhorst@arm.com DPRINTF(SnoopFilter, "%s: new SF value %x.%x interest: %x \n", 23010399Sstephan.diestelhorst@arm.com __func__, sf_item.requested, sf_item.holder, interested); 23110399Sstephan.diestelhorst@arm.com 23210399Sstephan.diestelhorst@arm.com return snoopSelected(maskToPortList(interested), lookupLatency); 23310399Sstephan.diestelhorst@arm.com} 23410399Sstephan.diestelhorst@arm.com 23510399Sstephan.diestelhorst@arm.comvoid 23610399Sstephan.diestelhorst@arm.comSnoopFilter::updateSnoopResponse(const Packet* cpkt, 23710399Sstephan.diestelhorst@arm.com const SlavePort& rsp_port, 23810399Sstephan.diestelhorst@arm.com const SlavePort& req_port) 23910399Sstephan.diestelhorst@arm.com{ 24011744Snikos.nikoleris@arm.com DPRINTF(SnoopFilter, "%s: rsp %s req %s packet %s\n", 24111744Snikos.nikoleris@arm.com __func__, rsp_port.name(), req_port.name(), cpkt->print()); 24210399Sstephan.diestelhorst@arm.com 24310821Sandreas.hansson@arm.com assert(cpkt->isResponse()); 24411284Sandreas.hansson@arm.com assert(cpkt->cacheResponding()); 24510821Sandreas.hansson@arm.com 24611603Sandreas.hansson@arm.com // if this snoop response is due to an uncacheable request, or is 24711603Sandreas.hansson@arm.com // being turned into a normal response, there is nothing more to 24811603Sandreas.hansson@arm.com // do 24911603Sandreas.hansson@arm.com if (cpkt->req->isUncacheable() || !req_port.isSnooping()) { 25010821Sandreas.hansson@arm.com return; 25111603Sandreas.hansson@arm.com } 25210821Sandreas.hansson@arm.com 25311128Sali.jafri@arm.com Addr line_addr = cpkt->getBlockAddr(linesize); 25411605Snikos.nikoleris@arm.com if (cpkt->isSecure()) { 25511605Snikos.nikoleris@arm.com line_addr |= LineSecure; 25611605Snikos.nikoleris@arm.com } 25710399Sstephan.diestelhorst@arm.com SnoopMask rsp_mask = portToMask(rsp_port); 25810399Sstephan.diestelhorst@arm.com SnoopMask req_mask = portToMask(req_port); 25910399Sstephan.diestelhorst@arm.com SnoopItem& sf_item = cachedLocations[line_addr]; 26010399Sstephan.diestelhorst@arm.com 26110399Sstephan.diestelhorst@arm.com DPRINTF(SnoopFilter, "%s: old SF value %x.%x\n", 26210399Sstephan.diestelhorst@arm.com __func__, sf_item.requested, sf_item.holder); 26310399Sstephan.diestelhorst@arm.com 26410399Sstephan.diestelhorst@arm.com // The source should have the line 26510399Sstephan.diestelhorst@arm.com panic_if(!(sf_item.holder & rsp_mask), "SF value %x.%x does not have "\ 26610399Sstephan.diestelhorst@arm.com "the line\n", sf_item.requested, sf_item.holder); 26710399Sstephan.diestelhorst@arm.com 26810399Sstephan.diestelhorst@arm.com // The destination should have had a request in 26910399Sstephan.diestelhorst@arm.com panic_if(!(sf_item.requested & req_mask), "SF value %x.%x missing "\ 27010399Sstephan.diestelhorst@arm.com "the original request\n", sf_item.requested, sf_item.holder); 27110399Sstephan.diestelhorst@arm.com 27211287Sandreas.hansson@arm.com // If the snoop response has no sharers the line is passed in 27311287Sandreas.hansson@arm.com // Modified state, and we know that there are no other copies, or 27411287Sandreas.hansson@arm.com // they will all be invalidated imminently 27511287Sandreas.hansson@arm.com if (!cpkt->hasSharers()) { 27611287Sandreas.hansson@arm.com DPRINTF(SnoopFilter, 27711287Sandreas.hansson@arm.com "%s: dropping %x because non-shared snoop " 27811287Sandreas.hansson@arm.com "response SF val: %x.%x\n", __func__, rsp_mask, 27910399Sstephan.diestelhorst@arm.com sf_item.requested, sf_item.holder); 28010399Sstephan.diestelhorst@arm.com sf_item.holder = 0; 28110399Sstephan.diestelhorst@arm.com } 28211199Sandreas.hansson@arm.com assert(!cpkt->isWriteback()); 28311603Sandreas.hansson@arm.com // @todo Deal with invalidating responses 28410399Sstephan.diestelhorst@arm.com sf_item.holder |= req_mask; 28510399Sstephan.diestelhorst@arm.com sf_item.requested &= ~req_mask; 28611129Sali.jafri@arm.com assert(sf_item.requested | sf_item.holder); 28710399Sstephan.diestelhorst@arm.com DPRINTF(SnoopFilter, "%s: new SF value %x.%x\n", 28810399Sstephan.diestelhorst@arm.com __func__, sf_item.requested, sf_item.holder); 28910399Sstephan.diestelhorst@arm.com} 29010399Sstephan.diestelhorst@arm.com 29110399Sstephan.diestelhorst@arm.comvoid 29210399Sstephan.diestelhorst@arm.comSnoopFilter::updateSnoopForward(const Packet* cpkt, 29310399Sstephan.diestelhorst@arm.com const SlavePort& rsp_port, const MasterPort& req_port) 29410399Sstephan.diestelhorst@arm.com{ 29511744Snikos.nikoleris@arm.com DPRINTF(SnoopFilter, "%s: rsp %s req %s packet %s\n", 29611744Snikos.nikoleris@arm.com __func__, rsp_port.name(), req_port.name(), cpkt->print()); 29710399Sstephan.diestelhorst@arm.com 29811134Sandreas.hansson@arm.com assert(cpkt->isResponse()); 29911284Sandreas.hansson@arm.com assert(cpkt->cacheResponding()); 30011134Sandreas.hansson@arm.com 30111128Sali.jafri@arm.com Addr line_addr = cpkt->getBlockAddr(linesize); 30211605Snikos.nikoleris@arm.com if (cpkt->isSecure()) { 30311605Snikos.nikoleris@arm.com line_addr |= LineSecure; 30411605Snikos.nikoleris@arm.com } 30511129Sali.jafri@arm.com auto sf_it = cachedLocations.find(line_addr); 30611134Sandreas.hansson@arm.com bool is_hit = sf_it != cachedLocations.end(); 30711134Sandreas.hansson@arm.com 30811134Sandreas.hansson@arm.com // Nothing to do if it is not a hit 30911134Sandreas.hansson@arm.com if (!is_hit) 31011134Sandreas.hansson@arm.com return; 31111134Sandreas.hansson@arm.com 31211129Sali.jafri@arm.com SnoopItem& sf_item = sf_it->second; 31310399Sstephan.diestelhorst@arm.com 31410399Sstephan.diestelhorst@arm.com DPRINTF(SnoopFilter, "%s: old SF value %x.%x\n", 31510399Sstephan.diestelhorst@arm.com __func__, sf_item.requested, sf_item.holder); 31610399Sstephan.diestelhorst@arm.com 31711287Sandreas.hansson@arm.com // If the snoop response has no sharers the line is passed in 31811287Sandreas.hansson@arm.com // Modified state, and we know that there are no other copies, or 31911287Sandreas.hansson@arm.com // they will all be invalidated imminently 32011287Sandreas.hansson@arm.com if (!cpkt->hasSharers()) { 32110399Sstephan.diestelhorst@arm.com sf_item.holder = 0; 32210399Sstephan.diestelhorst@arm.com } 32310399Sstephan.diestelhorst@arm.com DPRINTF(SnoopFilter, "%s: new SF value %x.%x\n", 32410399Sstephan.diestelhorst@arm.com __func__, sf_item.requested, sf_item.holder); 32511129Sali.jafri@arm.com eraseIfNullEntry(sf_it); 32611134Sandreas.hansson@arm.com 32710399Sstephan.diestelhorst@arm.com} 32810399Sstephan.diestelhorst@arm.com 32910399Sstephan.diestelhorst@arm.comvoid 33010399Sstephan.diestelhorst@arm.comSnoopFilter::updateResponse(const Packet* cpkt, const SlavePort& slave_port) 33110399Sstephan.diestelhorst@arm.com{ 33211744Snikos.nikoleris@arm.com DPRINTF(SnoopFilter, "%s: src %s packet %s\n", 33311744Snikos.nikoleris@arm.com __func__, slave_port.name(), cpkt->print()); 33410399Sstephan.diestelhorst@arm.com 33510821Sandreas.hansson@arm.com assert(cpkt->isResponse()); 33610821Sandreas.hansson@arm.com 33711603Sandreas.hansson@arm.com // we only allocate if the packet actually came from a cache, but 33811603Sandreas.hansson@arm.com // start by checking if the port is snooping 33911603Sandreas.hansson@arm.com if (cpkt->req->isUncacheable() || !slave_port.isSnooping()) 34010821Sandreas.hansson@arm.com return; 34110821Sandreas.hansson@arm.com 34211603Sandreas.hansson@arm.com // next check if we actually allocated an entry 34311128Sali.jafri@arm.com Addr line_addr = cpkt->getBlockAddr(linesize); 34411605Snikos.nikoleris@arm.com if (cpkt->isSecure()) { 34511605Snikos.nikoleris@arm.com line_addr |= LineSecure; 34611605Snikos.nikoleris@arm.com } 34711603Sandreas.hansson@arm.com auto sf_it = cachedLocations.find(line_addr); 34811603Sandreas.hansson@arm.com if (sf_it == cachedLocations.end()) 34911603Sandreas.hansson@arm.com return; 35011603Sandreas.hansson@arm.com 35110399Sstephan.diestelhorst@arm.com SnoopMask slave_mask = portToMask(slave_port); 35211603Sandreas.hansson@arm.com SnoopItem& sf_item = sf_it->second; 35310399Sstephan.diestelhorst@arm.com 35410399Sstephan.diestelhorst@arm.com DPRINTF(SnoopFilter, "%s: old SF value %x.%x\n", 35510399Sstephan.diestelhorst@arm.com __func__, sf_item.requested, sf_item.holder); 35610399Sstephan.diestelhorst@arm.com 35710399Sstephan.diestelhorst@arm.com // Make sure we have seen the actual request, too 35810399Sstephan.diestelhorst@arm.com panic_if(!(sf_item.requested & slave_mask), "SF value %x.%x missing "\ 35910399Sstephan.diestelhorst@arm.com "request bit\n", sf_item.requested, sf_item.holder); 36010399Sstephan.diestelhorst@arm.com 36111287Sandreas.hansson@arm.com // Update the residency of the cache line. If the response has no 36211287Sandreas.hansson@arm.com // sharers we know that the line has been invalidated in all 36311287Sandreas.hansson@arm.com // branches that are not where we are responding to. 36411287Sandreas.hansson@arm.com if (!cpkt->hasSharers()) 36510399Sstephan.diestelhorst@arm.com sf_item.holder = 0; 36610399Sstephan.diestelhorst@arm.com sf_item.holder |= slave_mask; 36710399Sstephan.diestelhorst@arm.com sf_item.requested &= ~slave_mask; 36811129Sali.jafri@arm.com assert(sf_item.holder | sf_item.requested); 36910399Sstephan.diestelhorst@arm.com DPRINTF(SnoopFilter, "%s: new SF value %x.%x\n", 37010399Sstephan.diestelhorst@arm.com __func__, sf_item.requested, sf_item.holder); 37110399Sstephan.diestelhorst@arm.com} 37210399Sstephan.diestelhorst@arm.com 37310403Sstephan.diestelhorst@arm.comvoid 37410403Sstephan.diestelhorst@arm.comSnoopFilter::regStats() 37510403Sstephan.diestelhorst@arm.com{ 37611523Sdavid.guillen@arm.com SimObject::regStats(); 37711523Sdavid.guillen@arm.com 37810403Sstephan.diestelhorst@arm.com totRequests 37910403Sstephan.diestelhorst@arm.com .name(name() + ".tot_requests") 38010403Sstephan.diestelhorst@arm.com .desc("Total number of requests made to the snoop filter."); 38110403Sstephan.diestelhorst@arm.com 38210403Sstephan.diestelhorst@arm.com hitSingleRequests 38310403Sstephan.diestelhorst@arm.com .name(name() + ".hit_single_requests") 38410403Sstephan.diestelhorst@arm.com .desc("Number of requests hitting in the snoop filter with a single "\ 38510403Sstephan.diestelhorst@arm.com "holder of the requested data."); 38610403Sstephan.diestelhorst@arm.com 38710403Sstephan.diestelhorst@arm.com hitMultiRequests 38810403Sstephan.diestelhorst@arm.com .name(name() + ".hit_multi_requests") 38910403Sstephan.diestelhorst@arm.com .desc("Number of requests hitting in the snoop filter with multiple "\ 39010403Sstephan.diestelhorst@arm.com "(>1) holders of the requested data."); 39110403Sstephan.diestelhorst@arm.com 39210403Sstephan.diestelhorst@arm.com totSnoops 39310403Sstephan.diestelhorst@arm.com .name(name() + ".tot_snoops") 39410403Sstephan.diestelhorst@arm.com .desc("Total number of snoops made to the snoop filter."); 39510403Sstephan.diestelhorst@arm.com 39610403Sstephan.diestelhorst@arm.com hitSingleSnoops 39710403Sstephan.diestelhorst@arm.com .name(name() + ".hit_single_snoops") 39810403Sstephan.diestelhorst@arm.com .desc("Number of snoops hitting in the snoop filter with a single "\ 39910403Sstephan.diestelhorst@arm.com "holder of the requested data."); 40010403Sstephan.diestelhorst@arm.com 40110403Sstephan.diestelhorst@arm.com hitMultiSnoops 40210403Sstephan.diestelhorst@arm.com .name(name() + ".hit_multi_snoops") 40310403Sstephan.diestelhorst@arm.com .desc("Number of snoops hitting in the snoop filter with multiple "\ 40410403Sstephan.diestelhorst@arm.com "(>1) holders of the requested data."); 40510403Sstephan.diestelhorst@arm.com} 40610403Sstephan.diestelhorst@arm.com 40710399Sstephan.diestelhorst@arm.comSnoopFilter * 40810399Sstephan.diestelhorst@arm.comSnoopFilterParams::create() 40910399Sstephan.diestelhorst@arm.com{ 41010399Sstephan.diestelhorst@arm.com return new SnoopFilter(this); 41110399Sstephan.diestelhorst@arm.com} 412