write_queue.cc revision 11375:f98df9231cdd 
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
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38 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
39 *
40 * Authors: Erik Hallnor
41 *          Andreas Sandberg
42 *          Andreas Hansson
43 */
44
45/** @file
46 * Definition of WriteQueue class functions.
47 */
48
49#include "mem/cache/write_queue.hh"
50
51using namespace std;
52
53WriteQueue::WriteQueue(const std::string &_label,
54                       int num_entries, int reserve)
55    : Queue<WriteQueueEntry>(_label, num_entries, reserve)
56{}
57
58WriteQueueEntry *
59WriteQueue::allocate(Addr blk_addr, unsigned blk_size, PacketPtr pkt,
60                    Tick when_ready, Counter order)
61{
62    assert(!freeList.empty());
63    WriteQueueEntry *entry = freeList.front();
64    assert(entry->getNumTargets() == 0);
65    freeList.pop_front();
66
67    entry->allocate(blk_addr, blk_size, pkt, when_ready, order);
68    entry->allocIter = allocatedList.insert(allocatedList.end(), entry);
69    entry->readyIter = addToReadyList(entry);
70
71    allocated += 1;
72    return entry;
73}
74
75void
76WriteQueue::markInService(WriteQueueEntry *entry)
77{
78    if (!entry->isUncacheable()) {
79        // a normal eviction, such as a writeback or a clean evict, no
80        // more to do as we are done from the perspective of this
81        // cache
82        entry->popTarget();
83        deallocate(entry);
84    } else {
85        // uncacheable write, and we will eventually receive a
86        // response
87        entry->markInService();
88        readyList.erase(entry->readyIter);
89        _numInService += 1;
90    }
91}
92