diff options
Diffstat (limited to 'src/mem/ruby/system/CacheMemory.cc')
| -rw-r--r-- | src/mem/ruby/system/CacheMemory.cc | 483 |
1 files changed, 483 insertions, 0 deletions
diff --git a/src/mem/ruby/system/CacheMemory.cc b/src/mem/ruby/system/CacheMemory.cc new file mode 100644 index 000000000..cf3e094ad --- /dev/null +++ b/src/mem/ruby/system/CacheMemory.cc @@ -0,0 +1,483 @@ +/* + * Copyright (c) 1999-2008 Mark D. Hill and David A. Wood + * All rights reserved. + * + * 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. + */ + +#include "mem/ruby/system/CacheMemory.hh" + +int CacheMemory::m_num_last_level_caches = 0; +MachineType CacheMemory::m_last_level_machine_type = MachineType_FIRST; + +// Output operator declaration +//ostream& operator<<(ostream& out, const CacheMemory<ENTRY>& obj); + +// ******************* Definitions ******************* + +// Output operator definition +ostream& operator<<(ostream& out, const CacheMemory& obj) +{ + obj.print(out); + out << flush; + return out; +} + + +// **************************************************************** + +CacheMemory::CacheMemory(const string & name) + : m_cache_name(name) +{ + m_profiler_ptr = new CacheProfiler(name); +} + +void CacheMemory::init(const vector<string> & argv) +{ + int cache_size = -1; + string policy; + + m_num_last_level_caches = + MachineType_base_count(MachineType_FIRST); + m_controller = NULL; + for (uint32 i=0; i<argv.size(); i+=2) { + if (argv[i] == "size") { + cache_size = atoi(argv[i+1].c_str()); + } else if (argv[i] == "latency") { + m_latency = atoi(argv[i+1].c_str()); + } else if (argv[i] == "assoc") { + m_cache_assoc = atoi(argv[i+1].c_str()); + } else if (argv[i] == "replacement_policy") { + policy = argv[i+1]; + } else if (argv[i] == "controller") { + m_controller = RubySystem::getController(argv[i+1]); + if (m_last_level_machine_type < m_controller->getMachineType()) { + m_num_last_level_caches = + MachineType_base_count(m_controller->getMachineType()); + m_last_level_machine_type = + m_controller->getMachineType(); + } + } else { + cerr << "WARNING: CacheMemory: Unknown configuration parameter: " << argv[i] << endl; + } + } + + int num_lines = cache_size/RubySystem::getBlockSizeBytes(); + m_cache_num_sets = num_lines / m_cache_assoc; + m_cache_num_set_bits = log_int(m_cache_num_sets); + assert(m_cache_num_set_bits > 0); + + if(policy == "PSEUDO_LRU") + m_replacementPolicy_ptr = new PseudoLRUPolicy(m_cache_num_sets, m_cache_assoc); + else if (policy == "LRU") + m_replacementPolicy_ptr = new LRUPolicy(m_cache_num_sets, m_cache_assoc); + else + assert(false); + + m_cache.setSize(m_cache_num_sets); + m_locked.setSize(m_cache_num_sets); + for (int i = 0; i < m_cache_num_sets; i++) { + m_cache[i].setSize(m_cache_assoc); + m_locked[i].setSize(m_cache_assoc); + for (int j = 0; j < m_cache_assoc; j++) { + m_cache[i][j] = NULL; + m_locked[i][j] = -1; + } + } +} + +CacheMemory::~CacheMemory() +{ + if(m_replacementPolicy_ptr != NULL) + delete m_replacementPolicy_ptr; + delete m_profiler_ptr; + for (int i = 0; i < m_cache_num_sets; i++) { + for (int j = 0; j < m_cache_assoc; j++) { + delete m_cache[i][j]; + } + } +} + +int +CacheMemory::numberOfLastLevelCaches() +{ + return m_num_last_level_caches; +} + + +void CacheMemory::printConfig(ostream& out) +{ + out << "Cache config: " << m_cache_name << endl; + if (m_controller != NULL) + out << " controller: " << m_controller->getName() << endl; + out << " cache_associativity: " << m_cache_assoc << endl; + out << " num_cache_sets_bits: " << m_cache_num_set_bits << endl; + const int cache_num_sets = 1 << m_cache_num_set_bits; + out << " num_cache_sets: " << cache_num_sets << endl; + out << " cache_set_size_bytes: " << cache_num_sets * RubySystem::getBlockSizeBytes() << endl; + out << " cache_set_size_Kbytes: " + << double(cache_num_sets * RubySystem::getBlockSizeBytes()) / (1<<10) << endl; + out << " cache_set_size_Mbytes: " + << double(cache_num_sets * RubySystem::getBlockSizeBytes()) / (1<<20) << endl; + out << " cache_size_bytes: " + << cache_num_sets * RubySystem::getBlockSizeBytes() * m_cache_assoc << endl; + out << " cache_size_Kbytes: " + << double(cache_num_sets * RubySystem::getBlockSizeBytes() * m_cache_assoc) / (1<<10) << endl; + out << " cache_size_Mbytes: " + << double(cache_num_sets * RubySystem::getBlockSizeBytes() * m_cache_assoc) / (1<<20) << endl; +} + +// PRIVATE METHODS + +// convert a Address to its location in the cache +Index CacheMemory::addressToCacheSet(const Address& address) const +{ + assert(address == line_address(address)); + return address.bitSelect(RubySystem::getBlockSizeBits(), RubySystem::getBlockSizeBits() + m_cache_num_set_bits-1); +} + +// Given a cache index: returns the index of the tag in a set. +// returns -1 if the tag is not found. +int CacheMemory::findTagInSet(Index cacheSet, const Address& tag) const +{ + assert(tag == line_address(tag)); + // search the set for the tags + m5::hash_map<Address, int>::const_iterator it = m_tag_index.find(tag); + if (it != m_tag_index.end()) + if (m_cache[cacheSet][it->second]->m_Permission != AccessPermission_NotPresent) + return it->second; + return -1; // Not found +} + +// Given a cache index: returns the index of the tag in a set. +// returns -1 if the tag is not found. +int CacheMemory::findTagInSetIgnorePermissions(Index cacheSet, const Address& tag) const +{ + assert(tag == line_address(tag)); + // search the set for the tags + m5::hash_map<Address, int>::const_iterator it = m_tag_index.find(tag); + if (it != m_tag_index.end()) + return it->second; + return -1; // Not found +} + +// PUBLIC METHODS +bool CacheMemory::tryCacheAccess(const Address& address, + CacheRequestType type, + DataBlock*& data_ptr) +{ + assert(address == line_address(address)); + DEBUG_EXPR(CACHE_COMP, HighPrio, address); + Index cacheSet = addressToCacheSet(address); + int loc = findTagInSet(cacheSet, address); + if(loc != -1){ // Do we even have a tag match? + AbstractCacheEntry* entry = m_cache[cacheSet][loc]; + m_replacementPolicy_ptr->touch(cacheSet, loc, g_eventQueue_ptr->getTime()); + data_ptr = &(entry->getDataBlk()); + + if(entry->m_Permission == AccessPermission_Read_Write) { + return true; + } + if ((entry->m_Permission == AccessPermission_Read_Only) && + (type == CacheRequestType_LD || type == CacheRequestType_IFETCH)) { + return true; + } + // The line must not be accessible + } + data_ptr = NULL; + return false; +} + +bool CacheMemory::testCacheAccess(const Address& address, + CacheRequestType type, + DataBlock*& data_ptr) +{ + assert(address == line_address(address)); + DEBUG_EXPR(CACHE_COMP, HighPrio, address); + Index cacheSet = addressToCacheSet(address); + int loc = findTagInSet(cacheSet, address); + if(loc != -1){ // Do we even have a tag match? + AbstractCacheEntry* entry = m_cache[cacheSet][loc]; + m_replacementPolicy_ptr->touch(cacheSet, loc, g_eventQueue_ptr->getTime()); + data_ptr = &(entry->getDataBlk()); + + return (m_cache[cacheSet][loc]->m_Permission != AccessPermission_NotPresent); + } + data_ptr = NULL; + return false; +} + +// tests to see if an address is present in the cache +bool CacheMemory::isTagPresent(const Address& address) const +{ + assert(address == line_address(address)); + Index cacheSet = addressToCacheSet(address); + int location = findTagInSet(cacheSet, address); + + if (location == -1) { + // We didn't find the tag + DEBUG_EXPR(CACHE_COMP, LowPrio, address); + DEBUG_MSG(CACHE_COMP, LowPrio, "No tag match"); + return false; + } + DEBUG_EXPR(CACHE_COMP, LowPrio, address); + DEBUG_MSG(CACHE_COMP, LowPrio, "found"); + return true; +} + +// Returns true if there is: +// a) a tag match on this address or there is +// b) an unused line in the same cache "way" +bool CacheMemory::cacheAvail(const Address& address) const +{ + assert(address == line_address(address)); + + Index cacheSet = addressToCacheSet(address); + + for (int i=0; i < m_cache_assoc; i++) { + AbstractCacheEntry* entry = m_cache[cacheSet][i]; + if (entry != NULL) { + if (entry->m_Address == address || // Already in the cache + entry->m_Permission == AccessPermission_NotPresent) { // We found an empty entry + return true; + } + } else { + return true; + } + } + return false; +} + +void CacheMemory::allocate(const Address& address, AbstractCacheEntry* entry) +{ + assert(address == line_address(address)); + assert(!isTagPresent(address)); + assert(cacheAvail(address)); + DEBUG_EXPR(CACHE_COMP, HighPrio, address); + + // Find the first open slot + Index cacheSet = addressToCacheSet(address); + for (int i=0; i < m_cache_assoc; i++) { + if (m_cache[cacheSet][i] == NULL || + m_cache[cacheSet][i]->m_Permission == AccessPermission_NotPresent) { + m_cache[cacheSet][i] = entry; // Init entry + m_cache[cacheSet][i]->m_Address = address; + m_cache[cacheSet][i]->m_Permission = AccessPermission_Invalid; + m_locked[cacheSet][i] = -1; + m_tag_index[address] = i; + + m_replacementPolicy_ptr->touch(cacheSet, i, g_eventQueue_ptr->getTime()); + + return; + } + } + ERROR_MSG("Allocate didn't find an available entry"); +} + +void CacheMemory::deallocate(const Address& address) +{ + assert(address == line_address(address)); + assert(isTagPresent(address)); + DEBUG_EXPR(CACHE_COMP, HighPrio, address); + Index cacheSet = addressToCacheSet(address); + int location = findTagInSet(cacheSet, address); + if (location != -1){ + delete m_cache[cacheSet][location]; + m_cache[cacheSet][location] = NULL; + m_locked[cacheSet][location] = -1; + m_tag_index.erase(address); + } +} + +// Returns with the physical address of the conflicting cache line +Address CacheMemory::cacheProbe(const Address& address) const +{ + assert(address == line_address(address)); + assert(!cacheAvail(address)); + + Index cacheSet = addressToCacheSet(address); + return m_cache[cacheSet][m_replacementPolicy_ptr->getVictim(cacheSet)]->m_Address; +} + +// looks an address up in the cache +AbstractCacheEntry& CacheMemory::lookup(const Address& address) +{ + assert(address == line_address(address)); + Index cacheSet = addressToCacheSet(address); + int loc = findTagInSet(cacheSet, address); + assert(loc != -1); + return *m_cache[cacheSet][loc]; +} + +// looks an address up in the cache +const AbstractCacheEntry& CacheMemory::lookup(const Address& address) const +{ + assert(address == line_address(address)); + Index cacheSet = addressToCacheSet(address); + int loc = findTagInSet(cacheSet, address); + assert(loc != -1); + return *m_cache[cacheSet][loc]; +} + +AccessPermission CacheMemory::getPermission(const Address& address) const +{ + assert(address == line_address(address)); + return lookup(address).m_Permission; +} + +void CacheMemory::changePermission(const Address& address, AccessPermission new_perm) +{ + assert(address == line_address(address)); + lookup(address).m_Permission = new_perm; + Index cacheSet = addressToCacheSet(address); + int loc = findTagInSet(cacheSet, address); + m_locked[cacheSet][loc] = -1; + assert(getPermission(address) == new_perm); +} + +// Sets the most recently used bit for a cache block +void CacheMemory::setMRU(const Address& address) +{ + Index cacheSet; + + cacheSet = addressToCacheSet(address); + m_replacementPolicy_ptr->touch(cacheSet, + findTagInSet(cacheSet, address), + g_eventQueue_ptr->getTime()); +} + +void CacheMemory::profileMiss(const CacheMsg & msg) +{ + m_profiler_ptr->addStatSample(msg.getType(), msg.getAccessMode(), + msg.getSize(), msg.getPrefetch()); +} + +void CacheMemory::recordCacheContents(CacheRecorder& tr) const +{ + for (int i = 0; i < m_cache_num_sets; i++) { + for (int j = 0; j < m_cache_assoc; j++) { + AccessPermission perm = m_cache[i][j]->m_Permission; + CacheRequestType request_type = CacheRequestType_NULL; + if (perm == AccessPermission_Read_Only) { + if (m_is_instruction_only_cache) { + request_type = CacheRequestType_IFETCH; + } else { + request_type = CacheRequestType_LD; + } + } else if (perm == AccessPermission_Read_Write) { + request_type = CacheRequestType_ST; + } + + if (request_type != CacheRequestType_NULL) { + // tr.addRecord(m_chip_ptr->getID(), m_cache[i][j].m_Address, + // Address(0), request_type, m_replacementPolicy_ptr->getLastAccess(i, j)); + } + } + } +} + +void CacheMemory::print(ostream& out) const +{ + out << "Cache dump: " << m_cache_name << endl; + for (int i = 0; i < m_cache_num_sets; i++) { + for (int j = 0; j < m_cache_assoc; j++) { + if (m_cache[i][j] != NULL) { + out << " Index: " << i + << " way: " << j + << " entry: " << *m_cache[i][j] << endl; + } else { + out << " Index: " << i + << " way: " << j + << " entry: NULL" << endl; + } + } + } +} + +void CacheMemory::printData(ostream& out) const +{ + out << "printData() not supported" << endl; +} + +void CacheMemory::clearStats() const +{ + m_profiler_ptr->clearStats(); +} + +void CacheMemory::printStats(ostream& out) const +{ + m_profiler_ptr->printStats(out); +} + +void CacheMemory::getMemoryValue(const Address& addr, char* value, + unsigned int size_in_bytes ){ + AbstractCacheEntry& entry = lookup(line_address(addr)); + unsigned int startByte = addr.getAddress() - line_address(addr).getAddress(); + for(unsigned int i=0; i<size_in_bytes; ++i){ + value[i] = entry.getDataBlk().getByte(i + startByte); + } +} + +void CacheMemory::setMemoryValue(const Address& addr, char* value, + unsigned int size_in_bytes ){ + AbstractCacheEntry& entry = lookup(line_address(addr)); + unsigned int startByte = addr.getAddress() - line_address(addr).getAddress(); + assert(size_in_bytes > 0); + for(unsigned int i=0; i<size_in_bytes; ++i){ + entry.getDataBlk().setByte(i + startByte, value[i]); + } + + // entry = lookup(line_address(addr)); +} + +void +CacheMemory::setLocked(const Address& address, int context) +{ + assert(address == line_address(address)); + Index cacheSet = addressToCacheSet(address); + int loc = findTagInSet(cacheSet, address); + assert(loc != -1); + m_locked[cacheSet][loc] = context; +} + +void +CacheMemory::clearLocked(const Address& address) +{ + assert(address == line_address(address)); + Index cacheSet = addressToCacheSet(address); + int loc = findTagInSet(cacheSet, address); + assert(loc != -1); + m_locked[cacheSet][loc] = -1; +} + +bool +CacheMemory::isLocked(const Address& address, int context) +{ + assert(address == line_address(address)); + Index cacheSet = addressToCacheSet(address); + int loc = findTagInSet(cacheSet, address); + assert(loc != -1); + return m_locked[cacheSet][loc] == context; +} + |