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/*
* 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/gems_common/util.hh"
#include "mem/ruby/system/PersistentTable.hh"
// randomize so that handoffs are not locality-aware
#if 0
int persistent_randomize[] = {0, 4, 8, 12, 1, 5, 9, 13, 2, 6,
10, 14, 3, 7, 11, 15};
int persistent_randomize[] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9,
10, 11, 12, 13, 14, 15};
#endif
PersistentTable::PersistentTable()
{
m_map_ptr = new Map<Address, PersistentTableEntry>;
}
PersistentTable::~PersistentTable()
{
delete m_map_ptr;
m_map_ptr = NULL;
}
void
PersistentTable::persistentRequestLock(const Address& address,
MachineID locker,
AccessType type)
{
#if 0
if (locker == m_chip_ptr->getID())
cout << "Chip " << m_chip_ptr->getID() << ": " << llocker
<< " requesting lock for " << address << endl;
MachineID locker = (MachineID) persistent_randomize[llocker];
#endif
assert(address == line_address(address));
if (!m_map_ptr->exist(address)) {
// Allocate if not present
PersistentTableEntry entry;
entry.m_starving.add(locker);
if (type == AccessType_Write) {
entry.m_request_to_write.add(locker);
}
m_map_ptr->add(address, entry);
} else {
PersistentTableEntry& entry = m_map_ptr->lookup(address);
//
// Make sure we're not already in the locked set
//
assert(!(entry.m_starving.isElement(locker)));
entry.m_starving.add(locker);
if (type == AccessType_Write) {
entry.m_request_to_write.add(locker);
}
assert(entry.m_marked.isSubset(entry.m_starving));
}
}
void
PersistentTable::persistentRequestUnlock(const Address& address,
MachineID unlocker)
{
#if 0
if (unlocker == m_chip_ptr->getID())
cout << "Chip " << m_chip_ptr->getID() << ": " << uunlocker
<< " requesting unlock for " << address << endl;
MachineID unlocker = (MachineID) persistent_randomize[uunlocker];
#endif
assert(address == line_address(address));
assert(m_map_ptr->exist(address));
PersistentTableEntry& entry = m_map_ptr->lookup(address);
//
// Make sure we're in the locked set
//
assert(entry.m_starving.isElement(unlocker));
assert(entry.m_marked.isSubset(entry.m_starving));
entry.m_starving.remove(unlocker);
entry.m_marked.remove(unlocker);
entry.m_request_to_write.remove(unlocker);
assert(entry.m_marked.isSubset(entry.m_starving));
// Deallocate if empty
if (entry.m_starving.isEmpty()) {
assert(entry.m_marked.isEmpty());
m_map_ptr->erase(address);
}
}
bool
PersistentTable::okToIssueStarving(const Address& address,
MachineID machId) const
{
assert(address == line_address(address));
if (!m_map_ptr->exist(address)) {
// No entry present
return true;
} else if (m_map_ptr->lookup(address).m_starving.isElement(machId)) {
// We can't issue another lockdown until are previous unlock
// has occurred
return false;
} else {
return m_map_ptr->lookup(address).m_marked.isEmpty();
}
}
MachineID
PersistentTable::findSmallest(const Address& address) const
{
assert(address == line_address(address));
assert(m_map_ptr->exist(address));
const PersistentTableEntry& entry = m_map_ptr->lookup(address);
return entry.m_starving.smallestElement();
}
AccessType
PersistentTable::typeOfSmallest(const Address& address) const
{
assert(address == line_address(address));
assert(m_map_ptr->exist(address));
const PersistentTableEntry& entry = m_map_ptr->lookup(address);
if (entry.m_request_to_write.
isElement(entry.m_starving.smallestElement())) {
return AccessType_Write;
} else {
return AccessType_Read;
}
}
void
PersistentTable::markEntries(const Address& address)
{
assert(address == line_address(address));
if (m_map_ptr->exist(address)) {
PersistentTableEntry& entry = m_map_ptr->lookup(address);
// None should be marked
assert(entry.m_marked.isEmpty());
// Mark all the nodes currently in the table
entry.m_marked = entry.m_starving;
}
}
bool
PersistentTable::isLocked(const Address& address) const
{
assert(address == line_address(address));
// If an entry is present, it must be locked
return m_map_ptr->exist(address);
}
int
PersistentTable::countStarvingForAddress(const Address& address) const
{
if (m_map_ptr->exist(address)) {
PersistentTableEntry& entry = m_map_ptr->lookup(address);
return (entry.m_starving.count());
} else {
return 0;
}
}
int
PersistentTable::countReadStarvingForAddress(const Address& address) const
{
if (m_map_ptr->exist(address)) {
PersistentTableEntry& entry = m_map_ptr->lookup(address);
return (entry.m_starving.count() - entry.m_request_to_write.count());
} else {
return 0;
}
}
void
PersistentTable::print(ostream& out) const
{
}
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