1/*
2 * Copyright (c) 2013-2015 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
9 * licensed hereunder. You may use the software subject to the license
10 * terms below provided that you ensure that this notice is replicated
11 * unmodified and in its entirety in all distributions of the software,
12 * modified or unmodified, in source code or in binary form.
13 *
14 * Redistribution and use in source and binary forms, with or without
15 * modification, are permitted provided that the following conditions are
16 * met: redistributions of source code must retain the above copyright
17 * notice, this list of conditions and the following disclaimer;
18 * redistributions in binary form must reproduce the above copyright
19 * notice, this list of conditions and the following disclaimer in the
20 * documentation and/or other materials provided with the distribution;
21 * neither the name of the copyright holders nor the names of its
22 * contributors may be used to endorse or promote products derived from
23 * this software without specific prior written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
26 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
27 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
28 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
29 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
30 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
31 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
32 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
33 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
34 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
35 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
36 *
37 * Authors: Stephan Diestelhorst
38 */
39
40/**
41 * @file
42 * Definition of a snoop filter.
43 */
44
45#ifndef __MEM_SNOOP_FILTER_HH__
46#define __MEM_SNOOP_FILTER_HH__
47
| 1/*
2 * Copyright (c) 2013-2015 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
9 * licensed hereunder. You may use the software subject to the license
10 * terms below provided that you ensure that this notice is replicated
11 * unmodified and in its entirety in all distributions of the software,
12 * modified or unmodified, in source code or in binary form.
13 *
14 * Redistribution and use in source and binary forms, with or without
15 * modification, are permitted provided that the following conditions are
16 * met: redistributions of source code must retain the above copyright
17 * notice, this list of conditions and the following disclaimer;
18 * redistributions in binary form must reproduce the above copyright
19 * notice, this list of conditions and the following disclaimer in the
20 * documentation and/or other materials provided with the distribution;
21 * neither the name of the copyright holders nor the names of its
22 * contributors may be used to endorse or promote products derived from
23 * this software without specific prior written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
26 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
27 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
28 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
29 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
30 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
31 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
32 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
33 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
34 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
35 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
36 *
37 * Authors: Stephan Diestelhorst
38 */
39
40/**
41 * @file
42 * Definition of a snoop filter.
43 */
44
45#ifndef __MEM_SNOOP_FILTER_HH__
46#define __MEM_SNOOP_FILTER_HH__
47
|
| 48#include <unordered_map>
|
48#include <utility>
49
| 49#include <utility>
50
|
50#include "base/hashmap.hh"
| |
51#include "mem/packet.hh"
52#include "mem/port.hh"
53#include "mem/qport.hh"
54#include "params/SnoopFilter.hh"
55#include "sim/sim_object.hh"
56#include "sim/system.hh"
57
58/**
59 * This snoop filter keeps track of which connected port has a
60 * particular line of data. It can be queried (through lookup*) on
61 * memory requests from above (reads / writes / ...); and also from
62 * below (snoops). The snoop filter precisely knows about the location
63 * of lines "above" it through a map from cache line address to
64 * sharers/ports. The snoop filter ties into the flows of requests
65 * (when they succeed at the lower interface), regular responses from
66 * below and also responses from sideway's caches (in update*). This
67 * allows the snoop filter to model cache-line residency by snooping
68 * the messages.
69 *
70 * The tracking happens in two fields to be able to distinguish
71 * between in-flight requests (in requested) and already pulled in
72 * lines (in holder). This distinction is used for producing tighter
73 * assertions and tracking request completion. For safety, (requested
74 * | holder) should be notified and the requesting MSHRs will take
75 * care of ordering.
76 *
77 * Overall, some trickery is required because:
78 * (1) snoops are not followed by an ACK, but only evoke a response if
79 * they need to (hit dirty)
80 * (2) side-channel information is funnelled through direct modifications of
81 * pkt, instead of proper messages through the bus
82 * (3) there are no clean evict messages telling the snoop filter that a local,
83 * upper cache dropped a line, making the snoop filter pessimistic for now
84 * (4) ordering: there is no single point of order in the system. Instead,
85 * requesting MSHRs track order between local requests and remote snoops
86 */
87class SnoopFilter : public SimObject {
88 public:
89 typedef std::vector<QueuedSlavePort*> SnoopList;
90
91 SnoopFilter (const SnoopFilterParams *p) :
92 SimObject(p), reqLookupResult(cachedLocations.end()), retryItem{0, 0},
93 linesize(p->system->cacheLineSize()), lookupLatency(p->lookup_latency),
94 maxEntryCount(p->max_capacity / p->system->cacheLineSize())
95 {
96 }
97
98 /**
99 * Init a new snoop filter and tell it about all the slave ports
100 * of the enclosing bus.
101 *
102 * @param slave_ports Slave ports that the bus is attached to.
103 */
104 void setSlavePorts(const SnoopList& slave_ports) {
105 localSlavePortIds.resize(slave_ports.size(), InvalidPortID);
106
107 PortID id = 0;
108 for (const auto& p : slave_ports) {
109 // no need to track this port if it is not snooping
110 if (p->isSnooping()) {
111 slavePorts.push_back(p);
112 localSlavePortIds[p->getId()] = id++;
113 }
114 }
115
116 // make sure we can deal with this many ports
117 fatal_if(id > 8 * sizeof(SnoopMask),
118 "Snoop filter only supports %d snooping ports, got %d\n",
119 8 * sizeof(SnoopMask), id);
120 }
121
122 /**
123 * Lookup a request (from a slave port) in the snoop filter and
124 * return a list of other slave ports that need forwarding of the
125 * resulting snoops. Additionally, update the tracking structures
126 * with new request information. Note that the caller must also
127 * call finishRequest once it is known if the request needs to
128 * retry or not.
129 *
130 * @param cpkt Pointer to the request packet. Not changed.
131 * @param slave_port Slave port where the request came from.
132 * @return Pair of a vector of snoop target ports and lookup latency.
133 */
134 std::pair<SnoopList, Cycles> lookupRequest(const Packet* cpkt,
135 const SlavePort& slave_port);
136
137 /**
138 * For an un-successful request, revert the change to the snoop
139 * filter. Also take care of erasing any null entries. This method
140 * relies on the result from lookupRequest being stored in
141 * reqLookupResult.
142 *
143 * @param will_retry This request will retry on this bus / snoop filter
144 * @param cpkt Request packet, merely for sanity checking
145 */
146 void finishRequest(bool will_retry, const Packet* cpkt);
147
148 /**
149 * Handle an incoming snoop from below (the master port). These
150 * can upgrade the tracking logic and may also benefit from
151 * additional steering thanks to the snoop filter.
152 *
153 * @param cpkt Pointer to const Packet containing the snoop.
154 * @return Pair with a vector of SlavePorts that need snooping and a lookup
155 * latency.
156 */
157 std::pair<SnoopList, Cycles> lookupSnoop(const Packet* cpkt);
158
159 /**
160 * Let the snoop filter see any snoop responses that turn into
161 * request responses and indicate cache to cache transfers. These
162 * will update the corresponding state in the filter.
163 *
164 * @param cpkt Pointer to const Packet holding the snoop response.
165 * @param rsp_port SlavePort that sends the response.
166 * @param req_port SlavePort that made the original request and is the
167 * destination of the snoop response.
168 */
169 void updateSnoopResponse(const Packet *cpkt, const SlavePort& rsp_port,
170 const SlavePort& req_port);
171
172 /**
173 * Pass snoop responses that travel downward through the snoop
174 * filter and let them update the snoop filter state. No
175 * additional routing happens.
176 *
177 * @param cpkt Pointer to const Packet holding the snoop response.
178 * @param rsp_port SlavePort that sends the response.
179 * @param req_port MasterPort through which the response is forwarded.
180 */
181 void updateSnoopForward(const Packet *cpkt, const SlavePort& rsp_port,
182 const MasterPort& req_port);
183
184 /**
185 * Update the snoop filter with a response from below (outer /
186 * other cache, or memory) and update the tracking information in
187 * the snoop filter.
188 *
189 * @param cpkt Pointer to const Packet holding the snoop response.
190 * @param slave_port SlavePort that made the original request and
191 * is the target of this response.
192 */
193 void updateResponse(const Packet *cpkt, const SlavePort& slave_port);
194
195 virtual void regStats();
196
197 protected:
198
199 /**
200 * The underlying type for the bitmask we use for tracking. This
201 * limits the number of snooping ports supported per crossbar. For
202 * the moment it is an uint64_t to offer maximum
203 * scalability. However, it is possible to use e.g. a uint16_t or
204 * uint32_to slim down the footprint of the hash map (and
205 * ultimately improve the simulation performance).
206 */
207 typedef uint64_t SnoopMask;
208
209 /**
210 * Per cache line item tracking a bitmask of SlavePorts who have an
211 * outstanding request to this line (requested) or already share a
212 * cache line with this address (holder).
213 */
214 struct SnoopItem {
215 SnoopMask requested;
216 SnoopMask holder;
217 };
218 /**
219 * HashMap of SnoopItems indexed by line address
220 */
| 51#include "mem/packet.hh"
52#include "mem/port.hh"
53#include "mem/qport.hh"
54#include "params/SnoopFilter.hh"
55#include "sim/sim_object.hh"
56#include "sim/system.hh"
57
58/**
59 * This snoop filter keeps track of which connected port has a
60 * particular line of data. It can be queried (through lookup*) on
61 * memory requests from above (reads / writes / ...); and also from
62 * below (snoops). The snoop filter precisely knows about the location
63 * of lines "above" it through a map from cache line address to
64 * sharers/ports. The snoop filter ties into the flows of requests
65 * (when they succeed at the lower interface), regular responses from
66 * below and also responses from sideway's caches (in update*). This
67 * allows the snoop filter to model cache-line residency by snooping
68 * the messages.
69 *
70 * The tracking happens in two fields to be able to distinguish
71 * between in-flight requests (in requested) and already pulled in
72 * lines (in holder). This distinction is used for producing tighter
73 * assertions and tracking request completion. For safety, (requested
74 * | holder) should be notified and the requesting MSHRs will take
75 * care of ordering.
76 *
77 * Overall, some trickery is required because:
78 * (1) snoops are not followed by an ACK, but only evoke a response if
79 * they need to (hit dirty)
80 * (2) side-channel information is funnelled through direct modifications of
81 * pkt, instead of proper messages through the bus
82 * (3) there are no clean evict messages telling the snoop filter that a local,
83 * upper cache dropped a line, making the snoop filter pessimistic for now
84 * (4) ordering: there is no single point of order in the system. Instead,
85 * requesting MSHRs track order between local requests and remote snoops
86 */
87class SnoopFilter : public SimObject {
88 public:
89 typedef std::vector<QueuedSlavePort*> SnoopList;
90
91 SnoopFilter (const SnoopFilterParams *p) :
92 SimObject(p), reqLookupResult(cachedLocations.end()), retryItem{0, 0},
93 linesize(p->system->cacheLineSize()), lookupLatency(p->lookup_latency),
94 maxEntryCount(p->max_capacity / p->system->cacheLineSize())
95 {
96 }
97
98 /**
99 * Init a new snoop filter and tell it about all the slave ports
100 * of the enclosing bus.
101 *
102 * @param slave_ports Slave ports that the bus is attached to.
103 */
104 void setSlavePorts(const SnoopList& slave_ports) {
105 localSlavePortIds.resize(slave_ports.size(), InvalidPortID);
106
107 PortID id = 0;
108 for (const auto& p : slave_ports) {
109 // no need to track this port if it is not snooping
110 if (p->isSnooping()) {
111 slavePorts.push_back(p);
112 localSlavePortIds[p->getId()] = id++;
113 }
114 }
115
116 // make sure we can deal with this many ports
117 fatal_if(id > 8 * sizeof(SnoopMask),
118 "Snoop filter only supports %d snooping ports, got %d\n",
119 8 * sizeof(SnoopMask), id);
120 }
121
122 /**
123 * Lookup a request (from a slave port) in the snoop filter and
124 * return a list of other slave ports that need forwarding of the
125 * resulting snoops. Additionally, update the tracking structures
126 * with new request information. Note that the caller must also
127 * call finishRequest once it is known if the request needs to
128 * retry or not.
129 *
130 * @param cpkt Pointer to the request packet. Not changed.
131 * @param slave_port Slave port where the request came from.
132 * @return Pair of a vector of snoop target ports and lookup latency.
133 */
134 std::pair<SnoopList, Cycles> lookupRequest(const Packet* cpkt,
135 const SlavePort& slave_port);
136
137 /**
138 * For an un-successful request, revert the change to the snoop
139 * filter. Also take care of erasing any null entries. This method
140 * relies on the result from lookupRequest being stored in
141 * reqLookupResult.
142 *
143 * @param will_retry This request will retry on this bus / snoop filter
144 * @param cpkt Request packet, merely for sanity checking
145 */
146 void finishRequest(bool will_retry, const Packet* cpkt);
147
148 /**
149 * Handle an incoming snoop from below (the master port). These
150 * can upgrade the tracking logic and may also benefit from
151 * additional steering thanks to the snoop filter.
152 *
153 * @param cpkt Pointer to const Packet containing the snoop.
154 * @return Pair with a vector of SlavePorts that need snooping and a lookup
155 * latency.
156 */
157 std::pair<SnoopList, Cycles> lookupSnoop(const Packet* cpkt);
158
159 /**
160 * Let the snoop filter see any snoop responses that turn into
161 * request responses and indicate cache to cache transfers. These
162 * will update the corresponding state in the filter.
163 *
164 * @param cpkt Pointer to const Packet holding the snoop response.
165 * @param rsp_port SlavePort that sends the response.
166 * @param req_port SlavePort that made the original request and is the
167 * destination of the snoop response.
168 */
169 void updateSnoopResponse(const Packet *cpkt, const SlavePort& rsp_port,
170 const SlavePort& req_port);
171
172 /**
173 * Pass snoop responses that travel downward through the snoop
174 * filter and let them update the snoop filter state. No
175 * additional routing happens.
176 *
177 * @param cpkt Pointer to const Packet holding the snoop response.
178 * @param rsp_port SlavePort that sends the response.
179 * @param req_port MasterPort through which the response is forwarded.
180 */
181 void updateSnoopForward(const Packet *cpkt, const SlavePort& rsp_port,
182 const MasterPort& req_port);
183
184 /**
185 * Update the snoop filter with a response from below (outer /
186 * other cache, or memory) and update the tracking information in
187 * the snoop filter.
188 *
189 * @param cpkt Pointer to const Packet holding the snoop response.
190 * @param slave_port SlavePort that made the original request and
191 * is the target of this response.
192 */
193 void updateResponse(const Packet *cpkt, const SlavePort& slave_port);
194
195 virtual void regStats();
196
197 protected:
198
199 /**
200 * The underlying type for the bitmask we use for tracking. This
201 * limits the number of snooping ports supported per crossbar. For
202 * the moment it is an uint64_t to offer maximum
203 * scalability. However, it is possible to use e.g. a uint16_t or
204 * uint32_to slim down the footprint of the hash map (and
205 * ultimately improve the simulation performance).
206 */
207 typedef uint64_t SnoopMask;
208
209 /**
210 * Per cache line item tracking a bitmask of SlavePorts who have an
211 * outstanding request to this line (requested) or already share a
212 * cache line with this address (holder).
213 */
214 struct SnoopItem {
215 SnoopMask requested;
216 SnoopMask holder;
217 };
218 /**
219 * HashMap of SnoopItems indexed by line address
220 */
|
221 typedef m5::hash_map<Addr, SnoopItem> SnoopFilterCache;
| 221 typedef std::unordered_map<Addr, SnoopItem> SnoopFilterCache;
|
222
223 /**
224 * Simple factory methods for standard return values.
225 */
226 std::pair<SnoopList, Cycles> snoopAll(Cycles latency) const
227 {
228 return std::make_pair(slavePorts, latency);
229 }
230 std::pair<SnoopList, Cycles> snoopSelected(const SnoopList& slave_ports,
231 Cycles latency) const
232 {
233 return std::make_pair(slave_ports, latency);
234 }
235 std::pair<SnoopList, Cycles> snoopDown(Cycles latency) const
236 {
237 SnoopList empty;
238 return std::make_pair(empty , latency);
239 }
240
241 /**
242 * Convert a single port to a corresponding, one-hot bitmask
243 * @param port SlavePort that should be converted.
244 * @return One-hot bitmask corresponding to the port.
245 */
246 SnoopMask portToMask(const SlavePort& port) const;
247 /**
248 * Converts a bitmask of ports into the corresponing list of ports
249 * @param ports SnoopMask of the requested ports
250 * @return SnoopList containing all the requested SlavePorts
251 */
252 SnoopList maskToPortList(SnoopMask ports) const;
253
254 private:
255
256 /**
257 * Removes snoop filter items which have no requesters and no holders.
258 */
259 void eraseIfNullEntry(SnoopFilterCache::iterator& sf_it);
260
261 /** Simple hash set of cached addresses. */
262 SnoopFilterCache cachedLocations;
263 /**
264 * Iterator used to store the result from lookupRequest until we
265 * call finishRequest.
266 */
267 SnoopFilterCache::iterator reqLookupResult;
268 /**
269 * Variable to temporarily store value of snoopfilter entry
270 * incase finishRequest needs to undo changes made in lookupRequest
271 * (because of crossbar retry)
272 */
273 SnoopItem retryItem;
274 /** List of all attached snooping slave ports. */
275 SnoopList slavePorts;
276 /** Track the mapping from port ids to the local mask ids. */
277 std::vector<PortID> localSlavePortIds;
278 /** Cache line size. */
279 const unsigned linesize;
280 /** Latency for doing a lookup in the filter */
281 const Cycles lookupLatency;
282 /** Max capacity in terms of cache blocks tracked, for sanity checking */
283 const unsigned maxEntryCount;
284
285 /** Statistics */
286 Stats::Scalar totRequests;
287 Stats::Scalar hitSingleRequests;
288 Stats::Scalar hitMultiRequests;
289
290 Stats::Scalar totSnoops;
291 Stats::Scalar hitSingleSnoops;
292 Stats::Scalar hitMultiSnoops;
293};
294
295inline SnoopFilter::SnoopMask
296SnoopFilter::portToMask(const SlavePort& port) const
297{
298 assert(port.getId() != InvalidPortID);
299 // if this is not a snooping port, return a zero mask
300 return !port.isSnooping() ? 0 :
301 ((SnoopMask)1) << localSlavePortIds[port.getId()];
302}
303
304inline SnoopFilter::SnoopList
305SnoopFilter::maskToPortList(SnoopMask port_mask) const
306{
307 SnoopList res;
308 for (const auto& p : slavePorts)
309 if (port_mask & portToMask(*p))
310 res.push_back(p);
311 return res;
312}
313
314#endif // __MEM_SNOOP_FILTER_HH__
| 222
223 /**
224 * Simple factory methods for standard return values.
225 */
226 std::pair<SnoopList, Cycles> snoopAll(Cycles latency) const
227 {
228 return std::make_pair(slavePorts, latency);
229 }
230 std::pair<SnoopList, Cycles> snoopSelected(const SnoopList& slave_ports,
231 Cycles latency) const
232 {
233 return std::make_pair(slave_ports, latency);
234 }
235 std::pair<SnoopList, Cycles> snoopDown(Cycles latency) const
236 {
237 SnoopList empty;
238 return std::make_pair(empty , latency);
239 }
240
241 /**
242 * Convert a single port to a corresponding, one-hot bitmask
243 * @param port SlavePort that should be converted.
244 * @return One-hot bitmask corresponding to the port.
245 */
246 SnoopMask portToMask(const SlavePort& port) const;
247 /**
248 * Converts a bitmask of ports into the corresponing list of ports
249 * @param ports SnoopMask of the requested ports
250 * @return SnoopList containing all the requested SlavePorts
251 */
252 SnoopList maskToPortList(SnoopMask ports) const;
253
254 private:
255
256 /**
257 * Removes snoop filter items which have no requesters and no holders.
258 */
259 void eraseIfNullEntry(SnoopFilterCache::iterator& sf_it);
260
261 /** Simple hash set of cached addresses. */
262 SnoopFilterCache cachedLocations;
263 /**
264 * Iterator used to store the result from lookupRequest until we
265 * call finishRequest.
266 */
267 SnoopFilterCache::iterator reqLookupResult;
268 /**
269 * Variable to temporarily store value of snoopfilter entry
270 * incase finishRequest needs to undo changes made in lookupRequest
271 * (because of crossbar retry)
272 */
273 SnoopItem retryItem;
274 /** List of all attached snooping slave ports. */
275 SnoopList slavePorts;
276 /** Track the mapping from port ids to the local mask ids. */
277 std::vector<PortID> localSlavePortIds;
278 /** Cache line size. */
279 const unsigned linesize;
280 /** Latency for doing a lookup in the filter */
281 const Cycles lookupLatency;
282 /** Max capacity in terms of cache blocks tracked, for sanity checking */
283 const unsigned maxEntryCount;
284
285 /** Statistics */
286 Stats::Scalar totRequests;
287 Stats::Scalar hitSingleRequests;
288 Stats::Scalar hitMultiRequests;
289
290 Stats::Scalar totSnoops;
291 Stats::Scalar hitSingleSnoops;
292 Stats::Scalar hitMultiSnoops;
293};
294
295inline SnoopFilter::SnoopMask
296SnoopFilter::portToMask(const SlavePort& port) const
297{
298 assert(port.getId() != InvalidPortID);
299 // if this is not a snooping port, return a zero mask
300 return !port.isSnooping() ? 0 :
301 ((SnoopMask)1) << localSlavePortIds[port.getId()];
302}
303
304inline SnoopFilter::SnoopList
305SnoopFilter::maskToPortList(SnoopMask port_mask) const
306{
307 SnoopList res;
308 for (const auto& p : slavePorts)
309 if (port_mask & portToMask(*p))
310 res.push_back(p);
311 return res;
312}
313
314#endif // __MEM_SNOOP_FILTER_HH__
|