1/*
2 * Copyright (c) 2013-2014 ARM Limited
3 * All rights reserved.
4 *
5 * The license below extends only to copyright in the software and shall
6 * not be construed as granting a license to any other intellectual
7 * property including but not limited to intellectual property relating
8 * to a hardware implementation of the functionality of the software

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51#include <cassert>
52
53#include "base/intmath.hh"
54#include "cpu/base.hh"
55#include "mem/cache/base.hh"
56#include "params/BasePrefetcher.hh"
57#include "sim/system.hh"
58
59BasePrefetcher::PrefetchInfo::PrefetchInfo(PacketPtr pkt, Addr addr)
60 : address(addr), pc(pkt->req->hasPC() ? pkt->req->getPC() : 0),
61 masterId(pkt->req->masterId()), validPC(pkt->req->hasPC()),
62 secure(pkt->isSecure())
63{
64}
65
66BasePrefetcher::PrefetchInfo::PrefetchInfo(PrefetchInfo const &pfi, Addr addr)
67 : address(addr), pc(pfi.pc), masterId(pfi.masterId), validPC(pfi.validPC),
68 secure(pfi.secure)
69{
70}
71
72void
73BasePrefetcher::PrefetchListener::notify(const PacketPtr &pkt)
74{
75 if (isFill) {
76 parent.notifyFill(pkt);
77 } else {
78 parent.probeNotify(pkt);
79 }
80}
81
82BasePrefetcher::BasePrefetcher(const BasePrefetcherParams *p)
83 : ClockedObject(p), listeners(), cache(nullptr), blkSize(p->block_size),
84 lBlkSize(floorLog2(blkSize)), onMiss(p->on_miss), onRead(p->on_read),
85 onWrite(p->on_write), onData(p->on_data), onInst(p->on_inst),
86 masterId(p->sys->getMasterId(this)), pageBytes(p->sys->getPageBytes()),

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109 pfIssued
110 .name(name() + ".num_hwpf_issued")
111 .desc("number of hwpf issued")
112 ;
113
114}
115
116bool
117BasePrefetcher::observeAccess(const PacketPtr &pkt) const
118{
119 Addr addr = pkt->getAddr();
120 bool fetch = pkt->req->isInstFetch();
121 bool read = pkt->isRead();
122 bool inv = pkt->isInvalidate();
123 bool is_secure = pkt->isSecure();
124
125 if (pkt->req->isUncacheable()) return false;
126 if (fetch && !onInst) return false;
127 if (!fetch && !onData) return false;
128 if (!fetch && read && !onRead) return false;
129 if (!fetch && !read && !onWrite) return false;
130 if (!fetch && !read && inv) return false;
131 if (pkt->cmd == MemCmd::CleanEvict) return false;
132
133 if (onMiss) {
134 return !inCache(addr, is_secure) &&
135 !inMissQueue(addr, is_secure);
136 }
137
138 return true;
139}
140
141bool
142BasePrefetcher::inCache(Addr addr, bool is_secure) const
143{

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188
189Addr
190BasePrefetcher::pageIthBlockAddress(Addr page, uint32_t blockIndex) const
191{
192 return page + (blockIndex << lBlkSize);
193}
194
195void
196BasePrefetcher::probeNotify(const PacketPtr &pkt)
197{
198 // Don't notify prefetcher on SWPrefetch, cache maintenance
199 // operations or for writes that we are coaslescing.
200 if (pkt->cmd.isSWPrefetch()) return;
201 if (pkt->req->isCacheMaintenance()) return;
202 if (pkt->isWrite() && cache != nullptr && cache->coalesce()) return;
203
204 if (hasBeenPrefetched(pkt->getAddr(), pkt->isSecure())) {
205 usefulPrefetches += 1;
206 }
207
208 // Verify this access type is observed by prefetcher
209 if (observeAccess(pkt)) {
210 if (useVirtualAddresses && pkt->req->hasVaddr()) {
211 PrefetchInfo pfi(pkt, pkt->req->getVaddr());
212 notify(pkt, pfi);
213 } else if (!useVirtualAddresses && pkt->req->hasPaddr()) {
214 PrefetchInfo pfi(pkt, pkt->req->getPaddr());
215 notify(pkt, pfi);
216 }
217 }
218}
219
220void
221BasePrefetcher::regProbeListeners()
222{
223 /**
224 * If no probes were added by the configuration scripts, connect to the
225 * parent cache using the probe "Miss". Also connect to "Hit", if the
226 * cache is configured to prefetch on accesses.
227 */
228 if (listeners.empty() && cache != nullptr) {
229 ProbeManager *pm(cache->getProbeManager());
230 listeners.push_back(new PrefetchListener(*this, pm, "Miss"));
231 listeners.push_back(new PrefetchListener(*this, pm, "Fill", true));
232 if (prefetchOnAccess) {
233 listeners.push_back(new PrefetchListener(*this, pm, "Hit"));
234 }
235 }
236}
237
238void
239BasePrefetcher::addEventProbe(SimObject *obj, const char *name)
240{
241 ProbeManager *pm(obj->getProbeManager());
242 listeners.push_back(new PrefetchListener(*this, pm, name));
243}