gem5  v20.1.0.0
write_queue.cc
Go to the documentation of this file.
1 /*
2  * Copyright (c) 2012-2013, 2015-2016 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  * Copyright (c) 2003-2005 The Regents of The University of Michigan
15  * All rights reserved.
16  *
17  * Redistribution and use in source and binary forms, with or without
18  * modification, are permitted provided that the following conditions are
19  * met: redistributions of source code must retain the above copyright
20  * notice, this list of conditions and the following disclaimer;
21  * redistributions in binary form must reproduce the above copyright
22  * notice, this list of conditions and the following disclaimer in the
23  * documentation and/or other materials provided with the distribution;
24  * neither the name of the copyright holders nor the names of its
25  * contributors may be used to endorse or promote products derived from
26  * this software without specific prior written permission.
27  *
28  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
29  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
30  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
31  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
32  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
33  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
34  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
35  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
36  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
37  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
38  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
39  */
40 
45 #include "mem/cache/write_queue.hh"
46 
47 #include <cassert>
48 
50 
51 WriteQueue::WriteQueue(const std::string &_label,
52  int num_entries, int reserve)
53  : Queue<WriteQueueEntry>(_label, num_entries, reserve)
54 {}
55 
57 WriteQueue::allocate(Addr blk_addr, unsigned blk_size, PacketPtr pkt,
58  Tick when_ready, Counter order)
59 {
60  assert(!freeList.empty());
61  WriteQueueEntry *entry = freeList.front();
62  assert(entry->getNumTargets() == 0);
63  freeList.pop_front();
64 
65  entry->allocate(blk_addr, blk_size, pkt, when_ready, order);
66  entry->allocIter = allocatedList.insert(allocatedList.end(), entry);
67  entry->readyIter = addToReadyList(entry);
68 
69  allocated += 1;
70  return entry;
71 }
72 
73 void
75 {
76  // for a normal eviction, such as a writeback or a clean evict,
77  // there is no more to do as we are done from the perspective of
78  // this cache, and for uncacheable write we do not need the entry
79  // as part of the response handling
80  entry->popTarget();
81  deallocate(entry);
82 }
Queue< WriteQueueEntry >::allocated
int allocated
The number of currently allocated entries.
Definition: queue.hh:119
WriteQueueEntry::allocate
void allocate(Addr blk_addr, unsigned blk_size, PacketPtr pkt, Tick when_ready, Counter _order)
Allocate a miss to this entry.
Definition: write_queue_entry.cc:87
Queue< WriteQueueEntry >::addToReadyList
WriteQueueEntry ::Iterator addToReadyList(WriteQueueEntry *entry)
Definition: queue.hh:100
WriteQueue::WriteQueue
WriteQueue(const std::string &_label, int num_entries, int reserve)
Create a write queue with a given number of entries.
Definition: write_queue.cc:51
Tick
uint64_t Tick
Tick count type.
Definition: types.hh:63
WriteQueue::allocate
WriteQueueEntry * allocate(Addr blk_addr, unsigned blk_size, PacketPtr pkt, Tick when_ready, Counter order)
Allocates a new WriteQueueEntry for the request and size.
Definition: write_queue.cc:57
Counter
int64_t Counter
Statistics counter type.
Definition: types.hh:58
WriteQueueEntry::readyIter
Iterator readyIter
Pointer to this entry on the ready list.
Definition: write_queue_entry.hh:100
Queue< WriteQueueEntry >::deallocate
void deallocate(WriteQueueEntry *entry)
Removes the given entry from the queue.
Definition: queue.hh:234
WriteQueueEntry::getNumTargets
int getNumTargets() const
Returns the current number of allocated targets.
Definition: write_queue_entry.hh:137
Queue< WriteQueueEntry >::freeList
WriteQueueEntry ::List freeList
Holds non allocated entries.
Definition: queue.hh:98
WriteQueueEntry::allocIter
Iterator allocIter
Pointer to this entry on the allocated list.
Definition: write_queue_entry.hh:106
Addr
uint64_t Addr
Address type This will probably be moved somewhere else in the near future.
Definition: types.hh:142
WriteQueueEntry::popTarget
void popTarget()
Pop first target.
Definition: write_queue_entry.hh:159
write_queue.hh
WriteQueueEntry
Write queue entry.
Definition: write_queue_entry.hh:65
Packet
A Packet is used to encapsulate a transfer between two objects in the memory system (e....
Definition: packet.hh:257
Queue
A high-level queue interface, to be used by both the MSHR queue and the write buffer.
Definition: queue.hh:66
WriteQueue::markInService
void markInService(WriteQueueEntry *entry)
Mark the given entry as in service.
Definition: write_queue.cc:74
Queue< WriteQueueEntry >::allocatedList
WriteQueueEntry ::List allocatedList
Holds pointers to all allocated entries.
Definition: queue.hh:94
write_queue_entry.hh

Generated on Wed Sep 30 2020 14:02:12 for gem5 by doxygen 1.8.17