cache.hh revision 2812
12810Srdreslin@umich.edu/* 22810Srdreslin@umich.edu * Copyright (c) 2002-2005 The Regents of The University of Michigan 32810Srdreslin@umich.edu * All rights reserved. 42810Srdreslin@umich.edu * 52810Srdreslin@umich.edu * Redistribution and use in source and binary forms, with or without 62810Srdreslin@umich.edu * modification, are permitted provided that the following conditions are 72810Srdreslin@umich.edu * met: redistributions of source code must retain the above copyright 82810Srdreslin@umich.edu * notice, this list of conditions and the following disclaimer; 92810Srdreslin@umich.edu * redistributions in binary form must reproduce the above copyright 102810Srdreslin@umich.edu * notice, this list of conditions and the following disclaimer in the 112810Srdreslin@umich.edu * documentation and/or other materials provided with the distribution; 122810Srdreslin@umich.edu * neither the name of the copyright holders nor the names of its 132810Srdreslin@umich.edu * contributors may be used to endorse or promote products derived from 142810Srdreslin@umich.edu * this software without specific prior written permission. 152810Srdreslin@umich.edu * 162810Srdreslin@umich.edu * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 172810Srdreslin@umich.edu * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 182810Srdreslin@umich.edu * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 192810Srdreslin@umich.edu * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 202810Srdreslin@umich.edu * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 212810Srdreslin@umich.edu * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 222810Srdreslin@umich.edu * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 232810Srdreslin@umich.edu * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 242810Srdreslin@umich.edu * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 252810Srdreslin@umich.edu * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 262810Srdreslin@umich.edu * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 272810Srdreslin@umich.edu * 282810Srdreslin@umich.edu * Authors: Erik Hallnor 292810Srdreslin@umich.edu * Dave Greene 302810Srdreslin@umich.edu * Steve Reinhardt 312810Srdreslin@umich.edu */ 322810Srdreslin@umich.edu 332810Srdreslin@umich.edu/** 342810Srdreslin@umich.edu * @file 352810Srdreslin@umich.edu * Describes a cache based on template policies. 362810Srdreslin@umich.edu */ 372810Srdreslin@umich.edu 382810Srdreslin@umich.edu#ifndef __CACHE_HH__ 392810Srdreslin@umich.edu#define __CACHE_HH__ 402810Srdreslin@umich.edu 412810Srdreslin@umich.edu#include "base/misc.hh" // fatal, panic, and warn 422810Srdreslin@umich.edu#include "cpu/smt.hh" // SMT_MAX_THREADS 432810Srdreslin@umich.edu 442810Srdreslin@umich.edu#include "mem/cache/base_cache.hh" 452810Srdreslin@umich.edu#include "mem/cache/prefetch/prefetcher.hh" 462810Srdreslin@umich.edu 472810Srdreslin@umich.edu// forward declarations 482810Srdreslin@umich.educlass Bus; 492810Srdreslin@umich.edu 502810Srdreslin@umich.edu/** 512810Srdreslin@umich.edu * A template-policy based cache. The behavior of the cache can be altered by 522810Srdreslin@umich.edu * supplying different template policies. TagStore handles all tag and data 532810Srdreslin@umich.edu * storage @sa TagStore. Buffering handles all misses and writes/writebacks 542810Srdreslin@umich.edu * @sa MissQueue. Coherence handles all coherence policy details @sa 552810Srdreslin@umich.edu * UniCoherence, SimpleMultiCoherence. 562810Srdreslin@umich.edu */ 572810Srdreslin@umich.edutemplate <class TagStore, class Buffering, class Coherence> 582810Srdreslin@umich.educlass Cache : public BaseCache 592810Srdreslin@umich.edu{ 602810Srdreslin@umich.edu public: 612810Srdreslin@umich.edu /** Define the type of cache block to use. */ 622810Srdreslin@umich.edu typedef typename TagStore::BlkType BlkType; 632810Srdreslin@umich.edu 642810Srdreslin@umich.edu bool prefetchAccess; 652810Srdreslin@umich.edu protected: 662810Srdreslin@umich.edu 672810Srdreslin@umich.edu /** Tag and data Storage */ 682810Srdreslin@umich.edu TagStore *tags; 692810Srdreslin@umich.edu /** Miss and Writeback handler */ 702810Srdreslin@umich.edu Buffering *missQueue; 712810Srdreslin@umich.edu /** Coherence protocol. */ 722810Srdreslin@umich.edu Coherence *coherence; 732810Srdreslin@umich.edu 742810Srdreslin@umich.edu /** Prefetcher */ 752810Srdreslin@umich.edu Prefetcher<TagStore, Buffering> *prefetcher; 762810Srdreslin@umich.edu 772810Srdreslin@umich.edu /** Do fast copies in this cache. */ 782810Srdreslin@umich.edu bool doCopy; 792810Srdreslin@umich.edu 802810Srdreslin@umich.edu /** Block on a delayed copy. */ 812810Srdreslin@umich.edu bool blockOnCopy; 822810Srdreslin@umich.edu 832810Srdreslin@umich.edu /** 842810Srdreslin@umich.edu * The clock ratio of the outgoing bus. 852810Srdreslin@umich.edu * Used for calculating critical word first. 862810Srdreslin@umich.edu */ 872810Srdreslin@umich.edu int busRatio; 882810Srdreslin@umich.edu 892810Srdreslin@umich.edu /** 902810Srdreslin@umich.edu * The bus width in bytes of the outgoing bus. 912810Srdreslin@umich.edu * Used for calculating critical word first. 922810Srdreslin@umich.edu */ 932810Srdreslin@umich.edu int busWidth; 942810Srdreslin@umich.edu 952810Srdreslin@umich.edu /** 962810Srdreslin@umich.edu * A permanent mem req to always be used to cause invalidations. 972810Srdreslin@umich.edu * Used to append to target list, to cause an invalidation. 982810Srdreslin@umich.edu */ 992810Srdreslin@umich.edu Packet * invalidatePkt; 1002810Srdreslin@umich.edu 1012810Srdreslin@umich.edu /** 1022810Srdreslin@umich.edu * Temporarily move a block into a MSHR. 1032810Srdreslin@umich.edu * @todo Remove this when LSQ/SB are fixed and implemented in memtest. 1042810Srdreslin@umich.edu */ 1052810Srdreslin@umich.edu void pseudoFill(Addr addr, int asid); 1062810Srdreslin@umich.edu 1072810Srdreslin@umich.edu /** 1082810Srdreslin@umich.edu * Temporarily move a block into an existing MSHR. 1092810Srdreslin@umich.edu * @todo Remove this when LSQ/SB are fixed and implemented in memtest. 1102810Srdreslin@umich.edu */ 1112810Srdreslin@umich.edu void pseudoFill(MSHR *mshr); 1122810Srdreslin@umich.edu 1132810Srdreslin@umich.edu public: 1142810Srdreslin@umich.edu 1152810Srdreslin@umich.edu class Params 1162810Srdreslin@umich.edu { 1172810Srdreslin@umich.edu public: 1182810Srdreslin@umich.edu TagStore *tags; 1192810Srdreslin@umich.edu Buffering *missQueue; 1202810Srdreslin@umich.edu Coherence *coherence; 1212810Srdreslin@umich.edu bool doCopy; 1222810Srdreslin@umich.edu bool blockOnCopy; 1232810Srdreslin@umich.edu BaseCache::Params baseParams; 1242810Srdreslin@umich.edu Bus *in; 1252810Srdreslin@umich.edu Bus *out; 1262810Srdreslin@umich.edu Prefetcher<TagStore, Buffering> *prefetcher; 1272810Srdreslin@umich.edu bool prefetchAccess; 1282810Srdreslin@umich.edu 1292810Srdreslin@umich.edu Params(TagStore *_tags, Buffering *mq, Coherence *coh, 1302810Srdreslin@umich.edu bool do_copy, BaseCache::Params params, Bus * in_bus, 1312810Srdreslin@umich.edu Bus * out_bus, Prefetcher<TagStore, Buffering> *_prefetcher, 1322810Srdreslin@umich.edu bool prefetch_access) 1332810Srdreslin@umich.edu : tags(_tags), missQueue(mq), coherence(coh), doCopy(do_copy), 1342810Srdreslin@umich.edu blockOnCopy(false), baseParams(params), in(in_bus), out(out_bus), 1352810Srdreslin@umich.edu prefetcher(_prefetcher), prefetchAccess(prefetch_access) 1362810Srdreslin@umich.edu { 1372810Srdreslin@umich.edu } 1382810Srdreslin@umich.edu }; 1392810Srdreslin@umich.edu 1402810Srdreslin@umich.edu /** Instantiates a basic cache object. */ 1412812Srdreslin@umich.edu Cache(const std::string &_name, Params ¶ms); 1422810Srdreslin@umich.edu 1432810Srdreslin@umich.edu void regStats(); 1442810Srdreslin@umich.edu 1452810Srdreslin@umich.edu /** 1462810Srdreslin@umich.edu * Performs the access specified by the request. 1472810Srdreslin@umich.edu * @param req The request to perform. 1482810Srdreslin@umich.edu * @return The result of the access. 1492810Srdreslin@umich.edu */ 1502812Srdreslin@umich.edu bool access(Packet * &pkt); 1512810Srdreslin@umich.edu 1522810Srdreslin@umich.edu /** 1532810Srdreslin@umich.edu * Selects a request to send on the bus. 1542810Srdreslin@umich.edu * @return The memory request to service. 1552810Srdreslin@umich.edu */ 1562810Srdreslin@umich.edu Packet * getPacket(); 1572810Srdreslin@umich.edu 1582810Srdreslin@umich.edu /** 1592810Srdreslin@umich.edu * Was the request was sent successfully? 1602810Srdreslin@umich.edu * @param req The request. 1612810Srdreslin@umich.edu * @param success True if the request was sent successfully. 1622810Srdreslin@umich.edu */ 1632810Srdreslin@umich.edu void sendResult(Packet * &pkt, bool success); 1642810Srdreslin@umich.edu 1652810Srdreslin@umich.edu /** 1662810Srdreslin@umich.edu * Handles a response (cache line fill/write ack) from the bus. 1672810Srdreslin@umich.edu * @param req The request being responded to. 1682810Srdreslin@umich.edu */ 1692810Srdreslin@umich.edu void handleResponse(Packet * &pkt); 1702810Srdreslin@umich.edu 1712810Srdreslin@umich.edu /** 1722810Srdreslin@umich.edu * Start handling a copy transaction. 1732810Srdreslin@umich.edu * @param req The copy request to perform. 1742810Srdreslin@umich.edu */ 1752810Srdreslin@umich.edu void startCopy(Packet * &pkt); 1762810Srdreslin@umich.edu 1772810Srdreslin@umich.edu /** 1782810Srdreslin@umich.edu * Handle a delayed copy transaction. 1792810Srdreslin@umich.edu * @param req The delayed copy request to continue. 1802810Srdreslin@umich.edu * @param addr The address being responded to. 1812810Srdreslin@umich.edu * @param blk The block of the current response. 1822810Srdreslin@umich.edu * @param mshr The mshr being handled. 1832810Srdreslin@umich.edu */ 1842810Srdreslin@umich.edu void handleCopy(Packet * &pkt, Addr addr, BlkType *blk, MSHR *mshr); 1852810Srdreslin@umich.edu 1862810Srdreslin@umich.edu /** 1872810Srdreslin@umich.edu * Selects a coherence message to forward to lower levels of the hierarchy. 1882810Srdreslin@umich.edu * @return The coherence message to forward. 1892810Srdreslin@umich.edu */ 1902810Srdreslin@umich.edu Packet * getCoherenceReq(); 1912810Srdreslin@umich.edu 1922810Srdreslin@umich.edu /** 1932810Srdreslin@umich.edu * Snoops bus transactions to maintain coherence. 1942810Srdreslin@umich.edu * @param req The current bus transaction. 1952810Srdreslin@umich.edu */ 1962810Srdreslin@umich.edu void snoop(Packet * &pkt); 1972810Srdreslin@umich.edu 1982810Srdreslin@umich.edu void snoopResponse(Packet * &pkt); 1992810Srdreslin@umich.edu 2002810Srdreslin@umich.edu /** 2012810Srdreslin@umich.edu * Invalidates the block containing address if found. 2022810Srdreslin@umich.edu * @param addr The address to look for. 2032810Srdreslin@umich.edu * @param asid The address space ID of the address. 2042810Srdreslin@umich.edu * @todo Is this function necessary? 2052810Srdreslin@umich.edu */ 2062810Srdreslin@umich.edu void invalidateBlk(Addr addr, int asid); 2072810Srdreslin@umich.edu 2082810Srdreslin@umich.edu /** 2092810Srdreslin@umich.edu * Aquash all requests associated with specified thread. 2102810Srdreslin@umich.edu * intended for use by I-cache. 2112811Srdreslin@umich.edu * @param req->getThreadNum()ber The thread to squash. 2122810Srdreslin@umich.edu */ 2132811Srdreslin@umich.edu void squash(int threadNum) 2142810Srdreslin@umich.edu { 2152811Srdreslin@umich.edu missQueue->squash(threadNum); 2162810Srdreslin@umich.edu } 2172810Srdreslin@umich.edu 2182810Srdreslin@umich.edu /** 2192810Srdreslin@umich.edu * Return the number of outstanding misses in a Cache. 2202810Srdreslin@umich.edu * Default returns 0. 2212810Srdreslin@umich.edu * 2222810Srdreslin@umich.edu * @retval unsigned The number of missing still outstanding. 2232810Srdreslin@umich.edu */ 2242810Srdreslin@umich.edu unsigned outstandingMisses() const 2252810Srdreslin@umich.edu { 2262810Srdreslin@umich.edu return missQueue->getMisses(); 2272810Srdreslin@umich.edu } 2282810Srdreslin@umich.edu 2292810Srdreslin@umich.edu /** 2302810Srdreslin@umich.edu * Send a response to the slave interface. 2312810Srdreslin@umich.edu * @param req The request being responded to. 2322810Srdreslin@umich.edu * @param time The time the response is ready. 2332810Srdreslin@umich.edu */ 2342810Srdreslin@umich.edu void respond(Packet * &pkt, Tick time) 2352810Srdreslin@umich.edu { 2362812Srdreslin@umich.edu //si->respond(pkt,time); 2372812Srdreslin@umich.edu cpuSidePort->sendAtomic(pkt); 2382810Srdreslin@umich.edu } 2392810Srdreslin@umich.edu 2402810Srdreslin@umich.edu /** 2412810Srdreslin@umich.edu * Perform the access specified in the request and return the estimated 2422810Srdreslin@umich.edu * time of completion. This function can either update the hierarchy state 2432810Srdreslin@umich.edu * or just perform the access wherever the data is found depending on the 2442810Srdreslin@umich.edu * state of the update flag. 2452810Srdreslin@umich.edu * @param req The memory request to satisfy 2462810Srdreslin@umich.edu * @param update If true, update the hierarchy, otherwise just perform the 2472810Srdreslin@umich.edu * request. 2482810Srdreslin@umich.edu * @return The estimated completion time. 2492810Srdreslin@umich.edu */ 2502810Srdreslin@umich.edu Tick probe(Packet * &pkt, bool update); 2512810Srdreslin@umich.edu 2522810Srdreslin@umich.edu /** 2532810Srdreslin@umich.edu * Snoop for the provided request in the cache and return the estimated 2542810Srdreslin@umich.edu * time of completion. 2552810Srdreslin@umich.edu * @todo Can a snoop probe not change state? 2562810Srdreslin@umich.edu * @param req The memory request to satisfy 2572810Srdreslin@umich.edu * @param update If true, update the hierarchy, otherwise just perform the 2582810Srdreslin@umich.edu * request. 2592810Srdreslin@umich.edu * @return The estimated completion time. 2602810Srdreslin@umich.edu */ 2612810Srdreslin@umich.edu Tick snoopProbe(Packet * &pkt, bool update); 2622810Srdreslin@umich.edu}; 2632810Srdreslin@umich.edu 2642810Srdreslin@umich.edu#endif // __CACHE_HH__ 265