#include <lsq.hh>

Classes
class	DcachePort
	DcachePort class for the load/store queue. More...

class	HtmCmdRequest

class	LSQRequest
	Memory operation metadata. More...

class	LSQSenderState
	Derived class to hold any sender state the LSQ needs. More...

class	SingleDataRequest

class	SplitDataRequest

Public Member Functions
	LSQ (CPU cpu_ptr, IEW iew_ptr, const O3CPUParams &params)
	Constructs an LSQ with the given parameters. More...

std::string	name () const
	Returns the name of the LSQ. More...

void	setActiveThreads (std::list< ThreadID > *at_ptr)
	Sets the pointer to the list of active threads. More...

void	drainSanityCheck () const
	Perform sanity checks after a drain. More...

bool	isDrained () const
	Has the LSQ drained? More...

void	takeOverFrom ()
	Takes over execution from another CPU's thread. More...

int	entryAmount (ThreadID num_threads)
	Number of entries needed for the given amount of threads. More...

void	tick ()
	Ticks the LSQ. More...

void	insertLoad (const DynInstPtr &load_inst)
	Inserts a load into the LSQ. More...

void	insertStore (const DynInstPtr &store_inst)
	Inserts a store into the LSQ. More...

Fault	executeLoad (const DynInstPtr &inst)
	Executes a load. More...

Fault	executeStore (const DynInstPtr &inst)
	Executes a store. More...

void	commitLoads (InstSeqNum &youngest_inst, ThreadID tid)
	Commits loads up until the given sequence number for a specific thread. More...

void	commitStores (InstSeqNum &youngest_inst, ThreadID tid)
	Commits stores up until the given sequence number for a specific thread. More...

void	writebackStores ()
	Attempts to write back stores until all cache ports are used or the interface becomes blocked. More...

void	writebackStores (ThreadID tid)
	Same as above, but only for one thread. More...

void	squash (const InstSeqNum &squashed_num, ThreadID tid)
	Squash instructions from a thread until the specified sequence number. More...

bool	violation ()
	Returns whether or not there was a memory ordering violation. More...

bool	violation (ThreadID tid)
	Returns whether or not there was a memory ordering violation for a specific thread. More...

DynInstPtr	getMemDepViolator (ThreadID tid)
	Gets the instruction that caused the memory ordering violation. More...

int	getLoadHead (ThreadID tid)
	Returns the head index of the load queue for a specific thread. More...

InstSeqNum	getLoadHeadSeqNum (ThreadID tid)
	Returns the sequence number of the head of the load queue. More...

int	getStoreHead (ThreadID tid)
	Returns the head index of the store queue. More...

InstSeqNum	getStoreHeadSeqNum (ThreadID tid)
	Returns the sequence number of the head of the store queue. More...

int	getCount ()
	Returns the number of instructions in all of the queues. More...

int	getCount (ThreadID tid)
	Returns the number of instructions in the queues of one thread. More...

int	numLoads ()
	Returns the total number of loads in the load queue. More...

int	numLoads (ThreadID tid)
	Returns the total number of loads for a single thread. More...

int	numStores ()
	Returns the total number of stores in the store queue. More...

int	numStores (ThreadID tid)
	Returns the total number of stores for a single thread. More...

int	numHtmStarts (ThreadID tid) const

int	numHtmStops (ThreadID tid) const

void	resetHtmStartsStops (ThreadID tid)

uint64_t	getLatestHtmUid (ThreadID tid) const

void	setLastRetiredHtmUid (ThreadID tid, uint64_t htmUid)

unsigned	numFreeLoadEntries ()
	Returns the number of free load entries. More...

unsigned	numFreeStoreEntries ()
	Returns the number of free store entries. More...

unsigned	numFreeEntries (ThreadID tid)
	Returns the number of free entries for a specific thread. More...

unsigned	numFreeLoadEntries (ThreadID tid)
	Returns the number of free entries in the LQ for a specific thread. More...

unsigned	numFreeStoreEntries (ThreadID tid)
	Returns the number of free entries in the SQ for a specific thread. More...

bool	isFull ()
	Returns if the LSQ is full (either LQ or SQ is full). More...

bool	isFull (ThreadID tid)
	Returns if the LSQ is full for a specific thread (either LQ or SQ is full). More...

bool	isEmpty () const
	Returns if the LSQ is empty (both LQ and SQ are empty). More...

bool	lqEmpty () const
	Returns if all of the LQs are empty. More...

bool	sqEmpty () const
	Returns if all of the SQs are empty. More...

bool	lqFull ()
	Returns if any of the LQs are full. More...

bool	lqFull (ThreadID tid)
	Returns if the LQ of a given thread is full. More...

bool	sqFull ()
	Returns if any of the SQs are full. More...

bool	sqFull (ThreadID tid)
	Returns if the SQ of a given thread is full. More...

bool	isStalled ()
	Returns if the LSQ is stalled due to a memory operation that must be replayed. More...

bool	isStalled (ThreadID tid)
	Returns if the LSQ of a specific thread is stalled due to a memory operation that must be replayed. More...

bool	hasStoresToWB ()
	Returns whether or not there are any stores to write back to memory. More...

bool	hasStoresToWB (ThreadID tid)
	Returns whether or not a specific thread has any stores to write back to memory. More...

int	numStoresToWB (ThreadID tid)
	Returns the number of stores a specific thread has to write back. More...

bool	willWB ()
	Returns if the LSQ will write back to memory this cycle. More...

bool	willWB (ThreadID tid)
	Returns if the LSQ of a specific thread will write back to memory this cycle. More...

void	dumpInsts () const
	Debugging function to print out all instructions. More...

void	dumpInsts (ThreadID tid) const
	Debugging function to print out instructions from a specific thread. More...

Fault	read (LSQRequest *req, int load_idx)
	Executes a read operation, using the load specified at the load index. More...

Fault	write (LSQRequest req, uint8_t data, int store_idx)
	Executes a store operation, using the store specified at the store index. More...

void	recvReqRetry ()
	Retry the previous send that failed. More...

void	completeDataAccess (PacketPtr pkt)

bool	recvTimingResp (PacketPtr pkt)
	Handles writing back and completing the load or store that has returned from memory. More...

void	recvTimingSnoopReq (PacketPtr pkt)

Fault	pushRequest (const DynInstPtr &inst, bool isLoad, uint8_t data, unsigned int size, Addr addr, Request::Flags flags, uint64_t res, AtomicOpFunctorPtr amo_op, const std::vector< bool > &byte_enable)

bool	cacheBlocked () const
	Is D-cache blocked? More...

void	cacheBlocked (bool v)
	Set D-cache blocked status. More...

bool	cachePortAvailable (bool is_load) const
	Is any store port available to use? More...

void	cachePortBusy (bool is_load)
	Another store port is in use. More...

RequestPort &	getDataPort ()

Public Attributes
CPU *	cpu
	The CPU pointer. More...

IEW *	iewStage
	The IEW stage pointer. More...

Static Protected Member Functions
static uint32_t	maxLSQAllocation (SMTQueuePolicy pol, uint32_t entries, uint32_t numThreads, uint32_t SMTThreshold)
	Auxiliary function to calculate per-thread max LSQ allocation limit. More...

Protected Attributes
bool	_cacheBlocked
	D-cache is blocked. More...

int	cacheStorePorts
	The number of cache ports available each cycle (stores only). More...

int	usedStorePorts
	The number of used cache ports in this cycle by stores. More...

int	cacheLoadPorts
	The number of cache ports available each cycle (loads only). More...

int	usedLoadPorts
	The number of used cache ports in this cycle by loads. More...

SMTQueuePolicy	lsqPolicy
	The LSQ policy for SMT mode. More...

std::list< ThreadID > *	activeThreads
	List of Active Threads in System. More...

unsigned	LQEntries
	Total Size of LQ Entries. More...

unsigned	SQEntries
	Total Size of SQ Entries. More...

unsigned	maxLQEntries
	Max LQ Size - Used to Enforce Sharing Policies. More...

unsigned	maxSQEntries
	Max SQ Size - Used to Enforce Sharing Policies. More...

DcachePort	dcachePort
	Data port. More...

std::vector< LSQUnit >	thread
	The LSQ units for individual threads. More...

ThreadID	numThreads
	Number of Threads. More...

Detailed Description

Definition at line 75 of file lsq.hh.

Constructor & Destructor Documentation

◆ LSQ()

gem5::o3::LSQ::LSQ	(	CPU *	cpu_ptr,
		IEW *	iew_ptr,
		const O3CPUParams &	params
	)

Constructs an LSQ with the given parameters.

Definition at line 81 of file lsq.cc.

References cpu, dcachePort, DPRINTF, lsqPolicy, maxLQEntries, maxSQEntries, gem5::o3::MaxThreads, numThreads, panic, and thread.

Member Function Documentation

◆ cacheBlocked() [1/2]

bool gem5::o3::LSQ::cacheBlocked ( ) const

Is D-cache blocked?

Definition at line 194 of file lsq.cc.

References _cacheBlocked.

Referenced by recvReqRetry(), and gem5::o3::LSQUnit::trySendPacket().

◆ cacheBlocked() [2/2]

void gem5::o3::LSQ::cacheBlocked ( bool v )

Set D-cache blocked status.

Definition at line 200 of file lsq.cc.

References _cacheBlocked, and gem5::ArmISA::v.

◆ cachePortAvailable()

bool gem5::o3::LSQ::cachePortAvailable ( bool is_load ) const

Is any store port available to use?

Definition at line 206 of file lsq.cc.

References cacheLoadPorts, cacheStorePorts, usedLoadPorts, and usedStorePorts.

Referenced by cachePortBusy(), gem5::o3::LSQUnit::trySendPacket(), and gem5::o3::LSQUnit::writebackStores().

◆ cachePortBusy()

void gem5::o3::LSQ::cachePortBusy ( bool is_load )

Another store port is in use.

Definition at line 218 of file lsq.cc.

References cachePortAvailable(), usedLoadPorts, and usedStorePorts.

Referenced by gem5::o3::LSQUnit::trySendPacket().

◆ commitLoads()

void gem5::o3::LSQ::commitLoads	(	InstSeqNum &	youngest_inst,
		ThreadID	tid
	)

Commits loads up until the given sequence number for a specific thread.

Definition at line 261 of file lsq.cc.

References thread.

Referenced by gem5::o3::IEW::tick().

◆ commitStores()

void gem5::o3::LSQ::commitStores	(	InstSeqNum &	youngest_inst,
		ThreadID	tid
	)

Commits stores up until the given sequence number for a specific thread.

Definition at line 267 of file lsq.cc.

References thread.

Referenced by gem5::o3::IEW::tick().

◆ completeDataAccess()

void gem5::o3::LSQ::completeDataAccess ( PacketPtr pkt )

Definition at line 403 of file lsq.cc.

References gem5::BaseCPU::contextToThread(), cpu, gem5::Packet::senderState, and thread.

◆ drainSanityCheck()

void gem5::o3::LSQ::drainSanityCheck ( ) const

Perform sanity checks after a drain.

Definition at line 145 of file lsq.cc.

References isDrained(), numThreads, and thread.

Referenced by gem5::o3::IEW::drainSanityCheck().

◆ dumpInsts() [1/2]

void gem5::o3::LSQ::dumpInsts ( ) const

Debugging function to print out all instructions.

Definition at line 755 of file lsq.cc.

References activeThreads, and thread.

◆ dumpInsts() [2/2]

void gem5::o3::LSQ::dumpInsts ( ThreadID tid ) const

Debugging function to print out instructions from a specific thread.

Definition at line 768 of file lsq.cc.

References thread.

◆ entryAmount()

int gem5::o3::LSQ::entryAmount ( ThreadID num_threads )

Number of entries needed for the given amount of threads.

◆ executeLoad()

Fault gem5::o3::LSQ::executeLoad ( const DynInstPtr & inst )

Executes a load.

Definition at line 245 of file lsq.cc.

References thread.

Referenced by gem5::o3::IEW::executeInsts().

◆ executeStore()

Fault gem5::o3::LSQ::executeStore ( const DynInstPtr & inst )

Executes a store.

Definition at line 253 of file lsq.cc.

References thread.

Referenced by gem5::o3::IEW::executeInsts().

◆ getCount() [1/2]

int gem5::o3::LSQ::getCount ( )

Returns the number of instructions in all of the queues.

Definition at line 464 of file lsq.cc.

References activeThreads, and gem5::statistics::total.

Referenced by gem5::o3::CPU::removeThread(), and gem5::o3::IEW::tick().

◆ getCount() [2/2]

int gem5::o3::LSQ::getCount ( ThreadID tid )

Returns the number of instructions in the queues of one thread.

Definition at line 345 of file lsq.cc.

References thread.

◆ getDataPort()

RequestPort& gem5::o3::LSQ::getDataPort ( )

inline

Definition at line 1010 of file lsq.hh.

References dcachePort.

Referenced by gem5::o3::CPU::getDataPort(), gem5::o3::CPU::htmSendAbortSignal(), and gem5::o3::IEW::startupStage().

◆ getLatestHtmUid()

uint64_t gem5::o3::LSQ::getLatestHtmUid ( ThreadID tid ) const

Definition at line 376 of file lsq.cc.

References gem5::InvalidThreadID, and thread.

Referenced by gem5::o3::IEW::dispatchInsts().

◆ getLoadHead()

int gem5::o3::LSQ::getLoadHead ( ThreadID tid )

Returns the head index of the load queue for a specific thread.

Definition at line 322 of file lsq.cc.

References thread.

◆ getLoadHeadSeqNum()

InstSeqNum gem5::o3::LSQ::getLoadHeadSeqNum ( ThreadID tid )

Returns the sequence number of the head of the load queue.

Definition at line 328 of file lsq.cc.

References thread.

◆ getMemDepViolator()

DynInstPtr gem5::o3::LSQ::getMemDepViolator ( ThreadID tid )

Gets the instruction that caused the memory ordering violation.

Definition at line 316 of file lsq.cc.

References thread.

Referenced by gem5::o3::IEW::executeInsts().

◆ getStoreHead()

int gem5::o3::LSQ::getStoreHead ( ThreadID tid )

Returns the head index of the store queue.

Definition at line 334 of file lsq.cc.

References thread.

◆ getStoreHeadSeqNum()

InstSeqNum gem5::o3::LSQ::getStoreHeadSeqNum ( ThreadID tid )

Returns the sequence number of the head of the store queue.

Definition at line 340 of file lsq.cc.

References thread.

◆ hasStoresToWB() [1/2]

bool gem5::o3::LSQ::hasStoresToWB ( )

Returns whether or not there are any stores to write back to memory.

Definition at line 705 of file lsq.cc.

References activeThreads.

Referenced by gem5::o3::IEW::hasStoresToWB().

◆ hasStoresToWB() [2/2]

bool gem5::o3::LSQ::hasStoresToWB ( ThreadID tid )

Returns whether or not a specific thread has any stores to write back to memory.

Definition at line 721 of file lsq.cc.

References thread.

◆ insertLoad()

void gem5::o3::LSQ::insertLoad ( const DynInstPtr & load_inst )

Inserts a load into the LSQ.

Definition at line 229 of file lsq.cc.

References thread.

Referenced by gem5::o3::IEW::dispatchInsts().

◆ insertStore()

void gem5::o3::LSQ::insertStore ( const DynInstPtr & store_inst )

Inserts a store into the LSQ.

Definition at line 237 of file lsq.cc.

References thread.

Referenced by gem5::o3::IEW::dispatchInsts().

◆ isDrained()

bool gem5::o3::LSQ::isDrained ( ) const

Has the LSQ drained?

Definition at line 154 of file lsq.cc.

References DPRINTF, lqEmpty(), and sqEmpty().

Referenced by drainSanityCheck(), and gem5::o3::IEW::isDrained().

◆ isEmpty()

bool gem5::o3::LSQ::isEmpty ( ) const

Returns if the LSQ is empty (both LQ and SQ are empty).

Definition at line 588 of file lsq.cc.

References lqEmpty(), and sqEmpty().

◆ isFull() [1/2]

bool gem5::o3::LSQ::isFull ( )

Returns if the LSQ is full (either LQ or SQ is full).

Definition at line 561 of file lsq.cc.

References activeThreads, lqFull(), sqFull(), and thread.

Referenced by isFull().

◆ isFull() [2/2]

bool gem5::o3::LSQ::isFull ( ThreadID tid )

Returns if the LSQ is full for a specific thread (either LQ or SQ is full).

Definition at line 577 of file lsq.cc.

References isFull(), lsqPolicy, and thread.

◆ isStalled() [1/2]

bool gem5::o3::LSQ::isStalled ( )

Returns if the LSQ is stalled due to a memory operation that must be replayed.

Definition at line 680 of file lsq.cc.

References activeThreads, and thread.

Referenced by isStalled().

◆ isStalled() [2/2]

bool gem5::o3::LSQ::isStalled ( ThreadID tid )

Returns if the LSQ of a specific thread is stalled due to a memory operation that must be replayed.

Definition at line 696 of file lsq.cc.

References isStalled(), lsqPolicy, and thread.

◆ lqEmpty()

bool gem5::o3::LSQ::lqEmpty ( ) const

Returns if all of the LQs are empty.

Definition at line 594 of file lsq.cc.

References activeThreads, and thread.

Referenced by isDrained(), and isEmpty().

◆ lqFull() [1/2]

bool gem5::o3::LSQ::lqFull ( )

Returns if any of the LQs are full.

Definition at line 626 of file lsq.cc.

References activeThreads, and thread.

Referenced by gem5::o3::IEW::dispatchInsts(), isFull(), and lqFull().

◆ lqFull() [2/2]

bool gem5::o3::LSQ::lqFull ( ThreadID tid )

Returns if the LQ of a given thread is full.

Definition at line 642 of file lsq.cc.

References lqFull(), lsqPolicy, and thread.

◆ maxLSQAllocation()

static uint32_t gem5::o3::LSQ::maxLSQAllocation	(	SMTQueuePolicy	pol,
		uint32_t	entries,
		uint32_t	numThreads,
		uint32_t	SMTThreshold
	)

inlinestaticprotected

Auxiliary function to calculate per-thread max LSQ allocation limit.

Depending on a policy, number of entries and possibly number of threads and threshold, this function calculates how many resources each thread can occupy at most.

Definition at line 1034 of file lsq.hh.

References numThreads.

◆ name()

std::string gem5::o3::LSQ::name ( ) const

Returns the name of the LSQ.

Definition at line 132 of file lsq.cc.

References iewStage, and gem5::o3::IEW::name().

◆ numFreeEntries()

unsigned gem5::o3::LSQ::numFreeEntries ( ThreadID tid )

Returns the number of free entries for a specific thread.

◆ numFreeLoadEntries() [1/2]

unsigned gem5::o3::LSQ::numFreeLoadEntries ( )

Returns the number of free load entries.

Definition at line 515 of file lsq.cc.

References activeThreads, thread, and gem5::statistics::total.

Referenced by gem5::o3::IEW::clearStates(), gem5::o3::Rename::clearStates(), gem5::o3::Rename::resetStage(), gem5::o3::IEW::startupStage(), and gem5::o3::IEW::tick().

◆ numFreeLoadEntries() [2/2]

unsigned gem5::o3::LSQ::numFreeLoadEntries ( ThreadID tid )

Returns the number of free entries in the LQ for a specific thread.

Definition at line 549 of file lsq.cc.

References thread.

◆ numFreeStoreEntries() [1/2]

unsigned gem5::o3::LSQ::numFreeStoreEntries ( )

Returns the number of free store entries.

Definition at line 532 of file lsq.cc.

References activeThreads, thread, and gem5::statistics::total.

Referenced by gem5::o3::IEW::clearStates(), gem5::o3::Rename::clearStates(), gem5::o3::Rename::resetStage(), gem5::o3::IEW::startupStage(), and gem5::o3::IEW::tick().

◆ numFreeStoreEntries() [2/2]

unsigned gem5::o3::LSQ::numFreeStoreEntries ( ThreadID tid )

Returns the number of free entries in the SQ for a specific thread.

Definition at line 555 of file lsq.cc.

References thread.

◆ numHtmStarts()

int gem5::o3::LSQ::numHtmStarts ( ThreadID tid ) const

Definition at line 352 of file lsq.cc.

References gem5::InvalidThreadID, and thread.

Referenced by gem5::o3::IEW::dispatchInsts().

◆ numHtmStops()

int gem5::o3::LSQ::numHtmStops ( ThreadID tid ) const

Definition at line 360 of file lsq.cc.

References gem5::InvalidThreadID, and thread.

Referenced by gem5::o3::IEW::dispatchInsts().

◆ numLoads() [1/2]

int gem5::o3::LSQ::numLoads ( )

Returns the total number of loads in the load queue.

Definition at line 481 of file lsq.cc.

References activeThreads, and gem5::statistics::total.

◆ numLoads() [2/2]

int gem5::o3::LSQ::numLoads ( ThreadID tid )

Returns the total number of loads for a single thread.

Definition at line 347 of file lsq.cc.

References thread.

◆ numStores() [1/2]

int gem5::o3::LSQ::numStores ( )

Returns the total number of stores in the store queue.

Definition at line 498 of file lsq.cc.

References activeThreads, thread, and gem5::statistics::total.

◆ numStores() [2/2]

int gem5::o3::LSQ::numStores ( ThreadID tid )

Returns the total number of stores for a single thread.

Definition at line 349 of file lsq.cc.

References thread.

◆ numStoresToWB()

int gem5::o3::LSQ::numStoresToWB ( ThreadID tid )

Returns the number of stores a specific thread has to write back.

Definition at line 727 of file lsq.cc.

References thread.

Referenced by writebackStores().

◆ pushRequest()

Fault gem5::o3::LSQ::pushRequest	(	const DynInstPtr &	inst,
		bool	isLoad,
		uint8_t *	data,
		unsigned int	size,
		Addr	addr,
		Request::Flags	flags,
		uint64_t *	res,
		AtomicOpFunctorPtr	amo_op,
		const std::vector< bool > &	byte_enable
	)

◆ read()

Fault gem5::o3::LSQ::read	(	LSQRequest *	req,
		int	load_idx
	)

Executes a read operation, using the load specified at the load index.

Definition at line 1424 of file lsq.cc.

References gem5::BaseCPU::contextToThread(), cpu, gem5::o3::LSQ::LSQRequest::request(), and thread.

Referenced by gem5::o3::CPU::read().

◆ recvReqRetry()

void gem5::o3::LSQ::recvReqRetry ( )

Retry the previous send that failed.

Definition at line 392 of file lsq.cc.

References activeThreads, cacheBlocked(), gem5::o3::IEW::cacheUnblocked(), iewStage, and thread.

◆ recvTimingResp()

bool gem5::o3::LSQ::recvTimingResp ( PacketPtr pkt )

Handles writing back and completing the load or store that has returned from memory.

Parameters

pkt	Response packet from the memory sub-system

Definition at line 411 of file lsq.cc.

References gem5::BaseCPU::contextToThread(), cpu, DPRINTF, gem5::Packet::getAddr(), gem5::Packet::isError(), gem5::Packet::isInvalidate(), numThreads, panic_if, gem5::Packet::senderState, and thread.

◆ recvTimingSnoopReq()

void gem5::o3::LSQ::recvTimingSnoopReq ( PacketPtr pkt )

Definition at line 448 of file lsq.cc.

References gem5::Packet::cmdString(), DPRINTF, gem5::Packet::getAddr(), gem5::Packet::isInvalidate(), numThreads, and thread.

◆ resetHtmStartsStops()

void gem5::o3::LSQ::resetHtmStartsStops ( ThreadID tid )

Definition at line 369 of file lsq.cc.

References gem5::InvalidThreadID, and thread.

Referenced by gem5::o3::CPU::htmSendAbortSignal().

◆ setActiveThreads()

void gem5::o3::LSQ::setActiveThreads ( std::list< ThreadID > * at_ptr )

Sets the pointer to the list of active threads.

Definition at line 138 of file lsq.cc.

References activeThreads.

Referenced by gem5::o3::IEW::setActiveThreads().

◆ setLastRetiredHtmUid()

void gem5::o3::LSQ::setLastRetiredHtmUid	(	ThreadID	tid,
		uint64_t	htmUid
	)

Definition at line 385 of file lsq.cc.

References gem5::InvalidThreadID, and thread.

Referenced by gem5::o3::IEW::setLastRetiredHtmUid().

◆ sqEmpty()

bool gem5::o3::LSQ::sqEmpty ( ) const

Returns if all of the SQs are empty.

Definition at line 610 of file lsq.cc.

References activeThreads, and thread.

Referenced by isDrained(), and isEmpty().

◆ sqFull() [1/2]

bool gem5::o3::LSQ::sqFull ( )

Returns if any of the SQs are full.

Definition at line 653 of file lsq.cc.

References activeThreads.

Referenced by gem5::o3::IEW::dispatchInsts(), isFull(), and sqFull().

◆ sqFull() [2/2]

bool gem5::o3::LSQ::sqFull ( ThreadID tid )

Returns if the SQ of a given thread is full.

Definition at line 669 of file lsq.cc.

References lsqPolicy, sqFull(), and thread.

◆ squash()

void gem5::o3::LSQ::squash	(	const InstSeqNum &	squashed_num,
		ThreadID	tid
	)

Squash instructions from a thread until the specified sequence number.

Definition at line 291 of file lsq.cc.

References thread.

Referenced by gem5::o3::IEW::squash().

◆ takeOverFrom()

void gem5::o3::LSQ::takeOverFrom ( )

Takes over execution from another CPU's thread.

Definition at line 172 of file lsq.cc.

References _cacheBlocked, numThreads, thread, and usedStorePorts.

Referenced by gem5::o3::IEW::takeOverFrom().

◆ tick()

void gem5::o3::LSQ::tick ( )

Ticks the LSQ.

Definition at line 183 of file lsq.cc.

References _cacheBlocked, cacheLoadPorts, gem5::o3::IEW::cacheUnblocked(), iewStage, usedLoadPorts, and usedStorePorts.

Referenced by gem5::o3::IEW::tick().

◆ violation() [1/2]

bool gem5::o3::LSQ::violation ( )

Returns whether or not there was a memory ordering violation.

Definition at line 297 of file lsq.cc.

References activeThreads, and thread.

Referenced by gem5::o3::IEW::executeInsts().

◆ violation() [2/2]

bool gem5::o3::LSQ::violation ( ThreadID tid )

Returns whether or not there was a memory ordering violation for a specific thread.

Definition at line 313 of file lsq.cc.

References thread.

◆ willWB() [1/2]

bool gem5::o3::LSQ::willWB ( )

Returns if the LSQ will write back to memory this cycle.

Definition at line 733 of file lsq.cc.

References activeThreads.

Referenced by gem5::o3::IEW::updateStatus().

◆ willWB() [2/2]

bool gem5::o3::LSQ::willWB ( ThreadID tid )

Returns if the LSQ of a specific thread will write back to memory this cycle.

Definition at line 749 of file lsq.cc.

References thread.

◆ write()

Fault gem5::o3::LSQ::write	(	LSQRequest *	req,
		uint8_t *	data,
		int	store_idx
	)

Executes a store operation, using the store specified at the store index.

Definition at line 1432 of file lsq.cc.

References gem5::BaseCPU::contextToThread(), cpu, data, gem5::o3::LSQ::LSQRequest::request(), and thread.

Referenced by gem5::o3::CPU::write().

◆ writebackStores() [1/2]

void gem5::o3::LSQ::writebackStores ( )

Attempts to write back stores until all cache ports are used or the interface becomes blocked.

Definition at line 273 of file lsq.cc.

References activeThreads, DPRINTF, numStoresToWB(), and thread.

Referenced by gem5::o3::IEW::tick().

◆ writebackStores() [2/2]

void gem5::o3::LSQ::writebackStores ( ThreadID tid )

Same as above, but only for one thread.

Member Data Documentation

◆ _cacheBlocked

bool gem5::o3::LSQ::_cacheBlocked

protected

D-cache is blocked.

Definition at line 1014 of file lsq.hh.

Referenced by cacheBlocked(), takeOverFrom(), and tick().

◆ activeThreads

std::list<ThreadID>* gem5::o3::LSQ::activeThreads

protected

List of Active Threads in System.

Definition at line 1052 of file lsq.hh.

Referenced by dumpInsts(), getCount(), hasStoresToWB(), isFull(), isStalled(), lqEmpty(), lqFull(), numFreeLoadEntries(), numFreeStoreEntries(), numLoads(), numStores(), recvReqRetry(), setActiveThreads(), sqEmpty(), sqFull(), violation(), willWB(), and writebackStores().

◆ cacheLoadPorts

int gem5::o3::LSQ::cacheLoadPorts

protected

The number of cache ports available each cycle (loads only).

Definition at line 1020 of file lsq.hh.

Referenced by cachePortAvailable(), and tick().

◆ cacheStorePorts

int gem5::o3::LSQ::cacheStorePorts

protected

The number of cache ports available each cycle (stores only).

Definition at line 1016 of file lsq.hh.

Referenced by cachePortAvailable().

◆ cpu

CPU* gem5::o3::LSQ::cpu

The CPU pointer.

Definition at line 996 of file lsq.hh.

Referenced by completeDataAccess(), LSQ(), pushRequest(), read(), recvTimingResp(), gem5::o3::LSQ::DcachePort::recvTimingSnoopReq(), and write().

◆ dcachePort

DcachePort gem5::o3::LSQ::dcachePort

protected

Data port.

Definition at line 1066 of file lsq.hh.

Referenced by getDataPort(), and LSQ().

◆ iewStage

IEW* gem5::o3::LSQ::iewStage

The IEW stage pointer.

Definition at line 999 of file lsq.hh.

Referenced by name(), recvReqRetry(), and tick().

◆ LQEntries

unsigned gem5::o3::LSQ::LQEntries

protected

Total Size of LQ Entries.

Definition at line 1055 of file lsq.hh.

◆ lsqPolicy

SMTQueuePolicy gem5::o3::LSQ::lsqPolicy

protected

The LSQ policy for SMT mode.

Definition at line 1026 of file lsq.hh.

Referenced by isFull(), isStalled(), lqFull(), LSQ(), and sqFull().

◆ maxLQEntries

unsigned gem5::o3::LSQ::maxLQEntries

protected

Max LQ Size - Used to Enforce Sharing Policies.

Definition at line 1060 of file lsq.hh.

Referenced by LSQ().

◆ maxSQEntries

unsigned gem5::o3::LSQ::maxSQEntries

protected

Max SQ Size - Used to Enforce Sharing Policies.

Definition at line 1063 of file lsq.hh.

Referenced by LSQ().

◆ numThreads

ThreadID gem5::o3::LSQ::numThreads

protected

Number of Threads.

Definition at line 1072 of file lsq.hh.

Referenced by drainSanityCheck(), LSQ(), maxLSQAllocation(), recvTimingResp(), recvTimingSnoopReq(), and takeOverFrom().

◆ SQEntries

unsigned gem5::o3::LSQ::SQEntries

protected

Total Size of SQ Entries.

Definition at line 1057 of file lsq.hh.

◆ thread

std::vector<LSQUnit> gem5::o3::LSQ::thread

protected

The LSQ units for individual threads.

Definition at line 1069 of file lsq.hh.

Referenced by commitLoads(), commitStores(), completeDataAccess(), drainSanityCheck(), dumpInsts(), executeLoad(), executeStore(), getCount(), getLatestHtmUid(), getLoadHead(), getLoadHeadSeqNum(), getMemDepViolator(), getStoreHead(), getStoreHeadSeqNum(), gem5::o3::LSQ::SingleDataRequest::handleLocalAccess(), gem5::o3::LSQ::SplitDataRequest::handleLocalAccess(), hasStoresToWB(), insertLoad(), insertStore(), isFull(), isStalled(), lqEmpty(), lqFull(), LSQ(), numFreeLoadEntries(), numFreeStoreEntries(), numHtmStarts(), numHtmStops(), numLoads(), numStores(), numStoresToWB(), pushRequest(), read(), recvReqRetry(), recvTimingResp(), recvTimingSnoopReq(), resetHtmStartsStops(), setLastRetiredHtmUid(), sqEmpty(), sqFull(), squash(), takeOverFrom(), violation(), willWB(), write(), and writebackStores().

◆ usedLoadPorts

int gem5::o3::LSQ::usedLoadPorts

protected

The number of used cache ports in this cycle by loads.

Definition at line 1022 of file lsq.hh.

Referenced by cachePortAvailable(), cachePortBusy(), and tick().

◆ usedStorePorts

int gem5::o3::LSQ::usedStorePorts

protected

The number of used cache ports in this cycle by stores.

Definition at line 1018 of file lsq.hh.

Referenced by cachePortAvailable(), cachePortBusy(), takeOverFrom(), and tick().

The documentation for this class was generated from the following files:

cpu/o3/lsq.hh
cpu/o3/lsq.cc

Classes

Public Member Functions

Public Attributes

Static Protected Member Functions

Protected Attributes

Detailed Description

Constructor & Destructor Documentation

◆ LSQ()

Member Function Documentation

◆ cacheBlocked() [1/2]

◆ cacheBlocked() [2/2]

◆ cachePortAvailable()

◆ cachePortBusy()

◆ commitLoads()

◆ commitStores()

◆ completeDataAccess()

◆ drainSanityCheck()

◆ dumpInsts() [1/2]

◆ dumpInsts() [2/2]

◆ entryAmount()

◆ executeLoad()

◆ executeStore()

◆ getCount() [1/2]

◆ getCount() [2/2]

◆ getDataPort()

◆ getLatestHtmUid()

◆ getLoadHead()

◆ getLoadHeadSeqNum()

◆ getMemDepViolator()

◆ getStoreHead()

◆ getStoreHeadSeqNum()

◆ hasStoresToWB() [1/2]

◆ hasStoresToWB() [2/2]

◆ insertLoad()

◆ insertStore()

◆ isDrained()

◆ isEmpty()

◆ isFull() [1/2]

◆ isFull() [2/2]

◆ isStalled() [1/2]

◆ isStalled() [2/2]

◆ lqEmpty()

◆ lqFull() [1/2]

◆ lqFull() [2/2]

◆ maxLSQAllocation()

◆ name()

◆ numFreeEntries()

◆ numFreeLoadEntries() [1/2]

◆ numFreeLoadEntries() [2/2]

◆ numFreeStoreEntries() [1/2]

◆ numFreeStoreEntries() [2/2]

◆ numHtmStarts()

◆ numHtmStops()

◆ numLoads() [1/2]

◆ numLoads() [2/2]

◆ numStores() [1/2]

◆ numStores() [2/2]

◆ numStoresToWB()

◆ pushRequest()

◆ read()

◆ recvReqRetry()

◆ recvTimingResp()

◆ recvTimingSnoopReq()

◆ resetHtmStartsStops()

◆ setActiveThreads()

◆ setLastRetiredHtmUid()

◆ sqEmpty()

◆ sqFull() [1/2]

◆ sqFull() [2/2]

◆ squash()

◆ takeOverFrom()

◆ tick()

◆ violation() [1/2]

◆ violation() [2/2]

◆ willWB() [1/2]

◆ willWB() [2/2]

◆ write()

◆ writebackStores() [1/2]

◆ writebackStores() [2/2]

Member Data Documentation