base_set_assoc.hh (13216:6ae030076b29) base_set_assoc.hh (13217:725b1701b4ee)
1/*
2 * Copyright (c) 2012-2014,2017 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

--- 45 unchanged lines hidden (view full) ---

54
55#include "base/logging.hh"
56#include "base/types.hh"
57#include "debug/CacheRepl.hh"
58#include "mem/cache/base.hh"
59#include "mem/cache/blk.hh"
60#include "mem/cache/replacement_policies/base.hh"
61#include "mem/cache/tags/base.hh"
1/*
2 * Copyright (c) 2012-2014,2017 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

--- 45 unchanged lines hidden (view full) ---

54
55#include "base/logging.hh"
56#include "base/types.hh"
57#include "debug/CacheRepl.hh"
58#include "mem/cache/base.hh"
59#include "mem/cache/blk.hh"
60#include "mem/cache/replacement_policies/base.hh"
61#include "mem/cache/tags/base.hh"
62#include "mem/cache/tags/cacheset.hh"
63#include "params/BaseSetAssoc.hh"
64
65/**
66 * A BaseSetAssoc cache tag store.
67 * @sa \ref gem5MemorySystem "gem5 Memory System"
68 *
69 * The BaseSetAssoc placement policy divides the cache into s sets of w
70 * cache lines (ways). A cache line is mapped onto a set, and can be placed
71 * into any of the ways of this set.
72 */
73class BaseSetAssoc : public BaseTags
74{
75 public:
76 /** Typedef the block type used in this tag store. */
77 typedef CacheBlk BlkType;
78 /** Typedef the set type used in this tag store. */
62#include "params/BaseSetAssoc.hh"
63
64/**
65 * A BaseSetAssoc cache tag store.
66 * @sa \ref gem5MemorySystem "gem5 Memory System"
67 *
68 * The BaseSetAssoc placement policy divides the cache into s sets of w
69 * cache lines (ways). A cache line is mapped onto a set, and can be placed
70 * into any of the ways of this set.
71 */
72class BaseSetAssoc : public BaseTags
73{
74 public:
75 /** Typedef the block type used in this tag store. */
76 typedef CacheBlk BlkType;
77 /** Typedef the set type used in this tag store. */
79 typedef CacheSet<CacheBlk> SetType;
78 typedef std::vector<CacheBlk*> SetType;
80
81 protected:
82 /** The associativity of the cache. */
83 const unsigned assoc;
84 /** The allocatable associativity of the cache (alloc mask). */
85 unsigned allocAssoc;
86
87 /** The cache blocks. */

--- 13 unchanged lines hidden (view full) ---

101 /** The amount to shift the address to get the tag. */
102 int tagShift;
103 /** Mask out all bits that aren't part of the set index. */
104 unsigned setMask;
105
106 /** Replacement policy */
107 BaseReplacementPolicy *replacementPolicy;
108
79
80 protected:
81 /** The associativity of the cache. */
82 const unsigned assoc;
83 /** The allocatable associativity of the cache (alloc mask). */
84 unsigned allocAssoc;
85
86 /** The cache blocks. */

--- 13 unchanged lines hidden (view full) ---

100 /** The amount to shift the address to get the tag. */
101 int tagShift;
102 /** Mask out all bits that aren't part of the set index. */
103 unsigned setMask;
104
105 /** Replacement policy */
106 BaseReplacementPolicy *replacementPolicy;
107
108 /**
109 * Find all possible block locations for insertion and replacement of
110 * an address. Should be called immediately before ReplacementPolicy's
111 * findVictim() not to break cache resizing.
112 * Returns blocks in all ways belonging to the set of the address.
113 *
114 * @param addr The addr to a find possible locations for.
115 * @return The possible locations.
116 */
117 std::vector<ReplaceableEntry*> getPossibleLocations(const Addr addr) const
118 override
119 {
120 std::vector<ReplaceableEntry*> locations;
121 for (const auto& blk : sets[extractSet(addr)]) {
122 locations.push_back(static_cast<ReplaceableEntry*>(blk));
123 }
124 return locations;
125 }
126
109 public:
110 /** Convenience typedef. */
111 typedef BaseSetAssocParams Params;
112
113 /**
114 * Construct and initialize this tag store.
115 */
116 BaseSetAssoc(const Params *p);

--- 65 unchanged lines hidden (view full) ---

182 // If a cache miss
183 lat = lookupLatency;
184 }
185
186 return blk;
187 }
188
189 /**
127 public:
128 /** Convenience typedef. */
129 typedef BaseSetAssocParams Params;
130
131 /**
132 * Construct and initialize this tag store.
133 */
134 BaseSetAssoc(const Params *p);

--- 65 unchanged lines hidden (view full) ---

200 // If a cache miss
201 lat = lookupLatency;
202 }
203
204 return blk;
205 }
206
207 /**
190 * Finds the given address in the cache, do not update replacement data.
191 * i.e. This is a no-side-effect find of a block.
192 *
193 * @param addr The address to find.
194 * @param is_secure True if the target memory space is secure.
195 * @return Pointer to the cache block if found.
196 */
197 CacheBlk* findBlock(Addr addr, bool is_secure) const override;
198
199 /**
200 * Find a block given set and way.
201 *
202 * @param set The set of the block.
203 * @param way The way of the block.
204 * @return The block.
205 */
206 ReplaceableEntry* findBlockBySetAndWay(int set, int way) const override;
207

--- 5 unchanged lines hidden (view full) ---

213 * @param is_secure True if the target memory space is secure.
214 * @param evict_blks Cache blocks to be evicted.
215 * @return Cache block to be replaced.
216 */
217 CacheBlk* findVictim(Addr addr, const bool is_secure,
218 std::vector<CacheBlk*>& evict_blks) const override
219 {
220 // Get possible locations for the victim block
208 * Find a block given set and way.
209 *
210 * @param set The set of the block.
211 * @param way The way of the block.
212 * @return The block.
213 */
214 ReplaceableEntry* findBlockBySetAndWay(int set, int way) const override;
215

--- 5 unchanged lines hidden (view full) ---

221 * @param is_secure True if the target memory space is secure.
222 * @param evict_blks Cache blocks to be evicted.
223 * @return Cache block to be replaced.
224 */
225 CacheBlk* findVictim(Addr addr, const bool is_secure,
226 std::vector<CacheBlk*>& evict_blks) const override
227 {
228 // Get possible locations for the victim block
221 std::vector<CacheBlk*> locations = getPossibleLocations(addr);
229 std::vector<ReplaceableEntry*> locations = getPossibleLocations(addr);
222
223 // Choose replacement victim from replacement candidates
224 CacheBlk* victim = static_cast<CacheBlk*>(replacementPolicy->getVictim(
225 std::vector<ReplaceableEntry*>(
226 locations.begin(), locations.end())));
227
228 // There is only one eviction for this replacement
229 evict_blks.push_back(victim);
230
231 DPRINTF(CacheRepl, "set %x, way %x: selecting blk for replacement\n",
232 victim->set, victim->way);
233
234 return victim;
235 }
236
237 /**
230
231 // Choose replacement victim from replacement candidates
232 CacheBlk* victim = static_cast<CacheBlk*>(replacementPolicy->getVictim(
233 std::vector<ReplaceableEntry*>(
234 locations.begin(), locations.end())));
235
236 // There is only one eviction for this replacement
237 evict_blks.push_back(victim);
238
239 DPRINTF(CacheRepl, "set %x, way %x: selecting blk for replacement\n",
240 victim->set, victim->way);
241
242 return victim;
243 }
244
245 /**
238 * Find all possible block locations for insertion and replacement of
239 * an address. Should be called immediately before ReplacementPolicy's
240 * findVictim() not to break cache resizing.
241 * Returns blocks in all ways belonging to the set of the address.
242 *
243 * @param addr The addr to a find possible locations for.
244 * @return The possible locations.
245 */
246 virtual const std::vector<CacheBlk*> getPossibleLocations(Addr addr) const
247 {
248 return sets[extractSet(addr)].blks;
249 }
250
251 /**
252 * Insert the new block into the cache and update replacement data.
253 *
254 * @param addr Address of the block.
255 * @param is_secure Whether the block is in secure space or not.
256 * @param src_master_ID The source requestor ID.
257 * @param task_ID The new task ID.
258 * @param blk The block to update.
259 */

--- 83 unchanged lines hidden --- 		246 * Insert the new block into the cache and update replacement data.
247 *
248 * @param addr Address of the block.
249 * @param is_secure Whether the block is in secure space or not.
250 * @param src_master_ID The source requestor ID.
251 * @param task_ID The new task ID.
252 * @param blk The block to update.
253 */

--- 83 unchanged lines hidden ---