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