113938Sodanrc@yahoo.com.br/**
213938Sodanrc@yahoo.com.br * Copyright (c) 2018 Inria
313938Sodanrc@yahoo.com.br * All rights reserved.
413938Sodanrc@yahoo.com.br *
513938Sodanrc@yahoo.com.br * Redistribution and use in source and binary forms, with or without
613938Sodanrc@yahoo.com.br * modification, are permitted provided that the following conditions are
713938Sodanrc@yahoo.com.br * met: redistributions of source code must retain the above copyright
813938Sodanrc@yahoo.com.br * notice, this list of conditions and the following disclaimer;
913938Sodanrc@yahoo.com.br * redistributions in binary form must reproduce the above copyright
1013938Sodanrc@yahoo.com.br * notice, this list of conditions and the following disclaimer in the
1113938Sodanrc@yahoo.com.br * documentation and/or other materials provided with the distribution;
1213938Sodanrc@yahoo.com.br * neither the name of the copyright holders nor the names of its
1313938Sodanrc@yahoo.com.br * contributors may be used to endorse or promote products derived from
1413938Sodanrc@yahoo.com.br * this software without specific prior written permission.
1513938Sodanrc@yahoo.com.br *
1613938Sodanrc@yahoo.com.br * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
1713938Sodanrc@yahoo.com.br * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
1813938Sodanrc@yahoo.com.br * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
1913938Sodanrc@yahoo.com.br * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
2013938Sodanrc@yahoo.com.br * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
2113938Sodanrc@yahoo.com.br * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
2213938Sodanrc@yahoo.com.br * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
2313938Sodanrc@yahoo.com.br * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
2413938Sodanrc@yahoo.com.br * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
2513938Sodanrc@yahoo.com.br * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
2613938Sodanrc@yahoo.com.br * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
2713938Sodanrc@yahoo.com.br *
2813938Sodanrc@yahoo.com.br * Authors: Daniel Carvalho
2913938Sodanrc@yahoo.com.br */
3013938Sodanrc@yahoo.com.br
3113938Sodanrc@yahoo.com.br/** @file
3213938Sodanrc@yahoo.com.br * Implementation of a simple superblock class. Each superblock consists of a
3313938Sodanrc@yahoo.com.br * number of compressed cache blocks limited by the maximum compression factor
3413938Sodanrc@yahoo.com.br * that may or may not be present in the cache.
3513938Sodanrc@yahoo.com.br */
3613938Sodanrc@yahoo.com.br
3713938Sodanrc@yahoo.com.br#include "mem/cache/tags/super_blk.hh"
3813938Sodanrc@yahoo.com.br
3913938Sodanrc@yahoo.com.br#include "base/logging.hh"
4013938Sodanrc@yahoo.com.br
4113938Sodanrc@yahoo.com.brCompressionBlk::CompressionBlk()
4213940Sodanrc@yahoo.com.br    : SectorSubBlk(), _size(0), _decompressionLatency(0)
4313938Sodanrc@yahoo.com.br{
4413938Sodanrc@yahoo.com.br}
4513940Sodanrc@yahoo.com.br
4613940Sodanrc@yahoo.com.brbool
4713940Sodanrc@yahoo.com.brCompressionBlk::isCompressed() const
4813940Sodanrc@yahoo.com.br{
4913940Sodanrc@yahoo.com.br    return (status & BlkCompressed) != 0;
5013940Sodanrc@yahoo.com.br}
5113940Sodanrc@yahoo.com.br
5213940Sodanrc@yahoo.com.brvoid
5313940Sodanrc@yahoo.com.brCompressionBlk::setCompressed()
5413940Sodanrc@yahoo.com.br{
5513940Sodanrc@yahoo.com.br    status |= BlkCompressed;
5613940Sodanrc@yahoo.com.br}
5713940Sodanrc@yahoo.com.br
5813940Sodanrc@yahoo.com.brvoid
5913940Sodanrc@yahoo.com.brCompressionBlk::setUncompressed()
6013940Sodanrc@yahoo.com.br{
6113940Sodanrc@yahoo.com.br    status &= ~BlkCompressed;
6213940Sodanrc@yahoo.com.br}
6313940Sodanrc@yahoo.com.br
6413940Sodanrc@yahoo.com.brstd::size_t
6513940Sodanrc@yahoo.com.brCompressionBlk::getSizeBits() const
6613940Sodanrc@yahoo.com.br{
6713940Sodanrc@yahoo.com.br    return _size;
6813940Sodanrc@yahoo.com.br}
6913940Sodanrc@yahoo.com.br
7013940Sodanrc@yahoo.com.brvoid
7113940Sodanrc@yahoo.com.brCompressionBlk::setSizeBits(const std::size_t size)
7213940Sodanrc@yahoo.com.br{
7313940Sodanrc@yahoo.com.br    _size = size;
7413940Sodanrc@yahoo.com.br}
7513940Sodanrc@yahoo.com.br
7613940Sodanrc@yahoo.com.brCycles
7713940Sodanrc@yahoo.com.brCompressionBlk::getDecompressionLatency() const
7813940Sodanrc@yahoo.com.br{
7913940Sodanrc@yahoo.com.br    return _decompressionLatency;
8013940Sodanrc@yahoo.com.br}
8113940Sodanrc@yahoo.com.br
8213940Sodanrc@yahoo.com.brvoid
8313940Sodanrc@yahoo.com.brCompressionBlk::setDecompressionLatency(const Cycles lat)
8413940Sodanrc@yahoo.com.br{
8513940Sodanrc@yahoo.com.br    _decompressionLatency = lat;
8613940Sodanrc@yahoo.com.br}
8713940Sodanrc@yahoo.com.br
8813940Sodanrc@yahoo.com.brstd::string
8913940Sodanrc@yahoo.com.brCompressionBlk::print() const
9013940Sodanrc@yahoo.com.br{
9113940Sodanrc@yahoo.com.br    return csprintf("%s compressed: %d size: %llu decompression latency: %d",
9213940Sodanrc@yahoo.com.br                    SectorSubBlk::print(), isCompressed(), getSizeBits(),
9313940Sodanrc@yahoo.com.br                    getDecompressionLatency());
9413940Sodanrc@yahoo.com.br}
9513940Sodanrc@yahoo.com.br
9613940Sodanrc@yahoo.com.brbool
9713947Sodanrc@yahoo.com.brSuperBlk::isCompressed(const CompressionBlk* ignored_blk) const
9813940Sodanrc@yahoo.com.br{
9913940Sodanrc@yahoo.com.br    for (const auto& blk : blks) {
10013947Sodanrc@yahoo.com.br        if (blk->isValid() && (blk != ignored_blk)) {
10113940Sodanrc@yahoo.com.br            return static_cast<CompressionBlk*>(blk)->isCompressed();
10213940Sodanrc@yahoo.com.br        }
10313940Sodanrc@yahoo.com.br    }
10413940Sodanrc@yahoo.com.br
10513940Sodanrc@yahoo.com.br    // An invalid block is seen as compressed
10613940Sodanrc@yahoo.com.br    return true;
10713940Sodanrc@yahoo.com.br}
10813947Sodanrc@yahoo.com.br
10913947Sodanrc@yahoo.com.brbool
11013947Sodanrc@yahoo.com.brSuperBlk::canCoAllocate(const std::size_t compressed_size) const
11113947Sodanrc@yahoo.com.br{
11213947Sodanrc@yahoo.com.br    // Simple co-allocation function: at most numBlocksPerSector blocks that
11313947Sodanrc@yahoo.com.br    // compress at least to (100/numBlocksPerSector)% of their original size
11413947Sodanrc@yahoo.com.br    // can share a superblock
11513947Sodanrc@yahoo.com.br    return (compressed_size <= (blkSize * 8) / blks.size());
11613947Sodanrc@yahoo.com.br}
11713947Sodanrc@yahoo.com.br
11813947Sodanrc@yahoo.com.brvoid
11913947Sodanrc@yahoo.com.brSuperBlk::setBlkSize(const std::size_t blk_size)
12013947Sodanrc@yahoo.com.br{
12113947Sodanrc@yahoo.com.br    assert(blkSize == 0);
12213947Sodanrc@yahoo.com.br    blkSize = blk_size;
12313947Sodanrc@yahoo.com.br}
124