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/*
* Copyright (c) 2015-2016 ARM Limited
* All rights reserved.
*
* The license below extends only to copyright in the software and shall
* not be construed as granting a license to any other intellectual
* property including but not limited to intellectual property relating
* to a hardware implementation of the functionality of the software
* licensed hereunder. You may use the software subject to the license
* terms below provided that you ensure that this notice is replicated
* unmodified and in its entirety in all distributions of the software,
* modified or unmodified, in source code or in binary form.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met: redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer;
* redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution;
* neither the name of the copyright holders nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* Authors: Andreas Hansson
*/
/**
* @file Declaration of a queue structure to manage uncacheable write
* and writebacks.
*/
#ifndef __MEM_CACHE_WRITE_QUEUE_HH__
#define __MEM_CACHE_WRITE_QUEUE_HH__
#include <string>
#include "base/types.hh"
#include "mem/cache/queue.hh"
#include "mem/cache/write_queue_entry.hh"
#include "mem/packet.hh"
/**
* A write queue for all eviction packets, i.e. writebacks and clean
* evictions, as well as uncacheable writes.
*/
class WriteQueue : public Queue<WriteQueueEntry>
{
public:
/**
* Create a write queue with a given number of entries.
* @param num_entries The number of entries in this queue.
* @param reserve The maximum number of entries needed to satisfy
* any access.
*/
WriteQueue(const std::string &_label, int num_entries, int reserve);
/**
* Allocates a new WriteQueueEntry for the request and size. This
* places the request as the first target in the WriteQueueEntry.
*
* @param blk_addr The address of the block.
* @param blk_size The number of bytes to request.
* @param pkt The original write.
* @param when_ready When is the WriteQueueEntry be ready to act upon.
* @param order The logical order of this WriteQueueEntry
*
* @return The a pointer to the WriteQueueEntry allocated.
*
* @pre There are free entries.
*/
WriteQueueEntry *allocate(Addr blk_addr, unsigned blk_size,
PacketPtr pkt, Tick when_ready, Counter order);
/**
* Mark the given entry as in service. This removes the entry from
* the readyList or deallocates the entry if it does not expect a
* response (writeback/eviction rather than an uncacheable write).
*
* @param entry The entry to mark in service.
*/
void markInService(WriteQueueEntry *entry);
};
#endif //__MEM_CACHE_WRITE_QUEUE_HH__
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