#include <hetero_mem_ctrl.hh>

Inheritance diagram for gem5::memory::HeteroMemCtrl:

Public Member Functions
	HeteroMemCtrl (const HeteroMemCtrlParams &p)

bool	allIntfDrained () const override
	Ensure that all interfaced have drained commands. More...

DrainState	drain () override
	Draining is the process of clearing out the states of SimObjects.These are the SimObjects that are partially executed or are partially in flight. More...

void	drainResume () override
	Resume execution after a successful drain. More...

Public Member Functions inherited from gem5::memory::MemCtrl
	MemCtrl (const MemCtrlParams &p)

DrainState	drain () override
	Draining is the process of clearing out the states of SimObjects.These are the SimObjects that are partially executed or are partially in flight. More...

virtual Tick	verifySingleCmd (Tick cmd_tick, Tick max_cmds_per_burst, bool row_cmd)
	Check for command bus contention for single cycle command. More...

virtual Tick	verifyMultiCmd (Tick cmd_tick, Tick max_cmds_per_burst, Tick max_multi_cmd_split=0)
	Check for command bus contention for multi-cycle (2 currently) command. More...

virtual bool	respondEventScheduled (uint8_t pseudo_channel=0) const
	Is there a respondEvent scheduled? More...

virtual bool	requestEventScheduled (uint8_t pseudo_channel=0) const
	Is there a read/write burst Event scheduled? More...

virtual void	restartScheduler (Tick tick, uint8_t pseudo_channel=0)
	restart the controller This can be used by interfaces to restart the scheduler after maintainence commands complete More...

bool	inReadBusState (bool next_state) const
	Check the current direction of the memory channel. More...

bool	inWriteBusState (bool next_state) const
	Check the current direction of the memory channel. More...

Port &	getPort (const std::string &if_name, PortID idx=InvalidPortID) override
	Get a port with a given name and index. More...

virtual void	init () override
	init() is called after all C++ SimObjects have been created and all ports are connected. More...

virtual void	startup () override
	startup() is the final initialization call before simulation. More...

Public Member Functions inherited from gem5::memory::qos::MemCtrl
	MemCtrl (const QoSMemCtrlParams &)
	QoS Memory base class. More...

virtual	~MemCtrl ()

BusState	getBusState () const
	Gets the current bus state. More...

BusState	getBusStateNext () const
	Gets the next bus state. More...

bool	hasRequestor (RequestorID id) const
	hasRequestor returns true if the selected requestor(ID) has been registered in the memory controller, which happens if the memory controller has received at least a packet from that requestor. More...

uint64_t	getReadQueueSize (const uint8_t prio) const
	Gets a READ queue size. More...

uint64_t	getWriteQueueSize (const uint8_t prio) const
	Gets a WRITE queue size. More...

uint64_t	getTotalReadQueueSize () const
	Gets the total combined READ queues size. More...

uint64_t	getTotalWriteQueueSize () const
	Gets the total combined WRITE queues size. More...

Tick	getServiceTick (const uint8_t prio) const
	Gets the last service tick related to a QoS Priority. More...

uint8_t	numPriorities () const
	Gets the total number of priority levels in the QoS memory controller. More...

System *	system () const
	read the system pointer More...

Public Member Functions inherited from gem5::ClockedObject
	ClockedObject (const ClockedObjectParams &p)

void	serialize (CheckpointOut &cp) const override
	Serialize an object. More...

void	unserialize (CheckpointIn &cp) override
	Unserialize an object. More...

Public Member Functions inherited from gem5::SimObject
const Params &	params () const

	SimObject (const Params &p)

virtual	~SimObject ()

virtual void	loadState (CheckpointIn &cp)
	loadState() is called on each SimObject when restoring from a checkpoint. More...

virtual void	initState ()
	initState() is called on each SimObject when not restoring from a checkpoint. More...

virtual void	regProbePoints ()
	Register probe points for this object. More...

virtual void	regProbeListeners ()
	Register probe listeners for this object. More...

ProbeManager *	getProbeManager ()
	Get the probe manager for this object. More...

DrainState	drain () override
	Provide a default implementation of the drain interface for objects that don't need draining. More...

virtual void	memWriteback ()
	Write back dirty buffers to memory using functional writes. More...

virtual void	memInvalidate ()
	Invalidate the contents of memory buffers. More...

void	serialize (CheckpointOut &cp) const override
	Serialize an object. More...

void	unserialize (CheckpointIn &cp) override
	Unserialize an object. More...

Public Member Functions inherited from gem5::EventManager
EventQueue *	eventQueue () const

void	schedule (Event &event, Tick when)

void	deschedule (Event &event)

void	reschedule (Event &event, Tick when, bool always=false)

void	schedule (Event *event, Tick when)

void	deschedule (Event *event)

void	reschedule (Event *event, Tick when, bool always=false)

void	wakeupEventQueue (Tick when=(Tick) -1)
	This function is not needed by the usual gem5 event loop but may be necessary in derived EventQueues which host gem5 on other schedulers. More...

void	setCurTick (Tick newVal)

	EventManager (EventManager &em)
	Event manger manages events in the event queue. More...

	EventManager (EventManager *em)

	EventManager (EventQueue *eq)

Public Member Functions inherited from gem5::Serializable
	Serializable ()

virtual	~Serializable ()

void	serializeSection (CheckpointOut &cp, const char *name) const
	Serialize an object into a new section. More...

void	serializeSection (CheckpointOut &cp, const std::string &name) const

void	unserializeSection (CheckpointIn &cp, const char *name)
	Unserialize an a child object. More...

void	unserializeSection (CheckpointIn &cp, const std::string &name)

Public Member Functions inherited from gem5::Drainable
DrainState	drainState () const
	Return the current drain state of an object. More...

virtual void	notifyFork ()
	Notify a child process of a fork. More...

Public Member Functions inherited from gem5::statistics::Group
	Group (Group parent, const char name=nullptr)
	Construct a new statistics group. More...

virtual	~Group ()

virtual void	regStats ()
	Callback to set stat parameters. More...

virtual void	resetStats ()
	Callback to reset stats. More...

virtual void	preDumpStats ()
	Callback before stats are dumped. More...

void	addStat (statistics::Info *info)
	Register a stat with this group. More...

const std::map< std::string, Group * > &	getStatGroups () const
	Get all child groups associated with this object. More...

const std::vector< Info * > &	getStats () const
	Get all stats associated with this object. More...

void	addStatGroup (const char name, Group block)
	Add a stat block as a child of this block. More...

const Info *	resolveStat (std::string name) const
	Resolve a stat by its name within this group. More...

void	mergeStatGroup (Group *block)
	Merge the contents (stats & children) of a block to this block. More...

	Group ()=delete

	Group (const Group &)=delete

Group &	operator= (const Group &)=delete

Public Member Functions inherited from gem5::Named
	Named (const std::string &name_)

virtual	~Named ()=default

virtual std::string	name () const

Public Member Functions inherited from gem5::Clocked
void	updateClockPeriod ()
	Update the tick to the current tick. More...

Tick	clockEdge (Cycles cycles=Cycles(0)) const
	Determine the tick when a cycle begins, by default the current one, but the argument also enables the caller to determine a future cycle. More...

Cycles	curCycle () const
	Determine the current cycle, corresponding to a tick aligned to a clock edge. More...

Tick	nextCycle () const
	Based on the clock of the object, determine the start tick of the first cycle that is at least one cycle in the future. More...

uint64_t	frequency () const

Tick	clockPeriod () const

double	voltage () const

Cycles	ticksToCycles (Tick t) const

Tick	cyclesToTicks (Cycles c) const

Protected Member Functions
Tick	recvAtomic (PacketPtr pkt) override

void	recvFunctional (PacketPtr pkt) override

bool	recvTimingReq (PacketPtr pkt) override

Protected Member Functions inherited from gem5::memory::MemCtrl
virtual void	processNextReqEvent (MemInterface *mem_intr, MemPacketQueue &resp_queue, EventFunctionWrapper &resp_event, EventFunctionWrapper &next_req_event, bool &retry_wr_req)
	Bunch of things requires to setup "events" in gem5 When event "respondEvent" occurs for example, the method processRespondEvent is called; no parameters are allowed in these methods. More...

bool	readQueueFull (unsigned int pkt_count) const
	Check if the read queue has room for more entries. More...

bool	writeQueueFull (unsigned int pkt_count) const
	Check if the write queue has room for more entries. More...

bool	addToReadQueue (PacketPtr pkt, unsigned int pkt_count, MemInterface *mem_intr)
	When a new read comes in, first check if the write q has a pending request to the same address. If not, decode the address to populate rank/bank/row, create one or mutliple "mem_pkt", and push them to the back of the read queue. More...

void	addToWriteQueue (PacketPtr pkt, unsigned int pkt_count, MemInterface *mem_intr)
	Decode the incoming pkt, create a mem_pkt and push to the back of the write queue. More...

virtual void	accessAndRespond (PacketPtr pkt, Tick static_latency, MemInterface *mem_intr)
	When a packet reaches its "readyTime" in the response Q, use the "access()" method in AbstractMemory to actually create the response packet, and send it back to the outside world requestor. More...

virtual bool	packetReady (MemPacket pkt, MemInterface mem_intr)
	Determine if there is a packet that can issue. More...

Tick	getBurstWindow (Tick cmd_tick)
	Calculate burst window aligned tick. More...

void	printQs () const
	Used for debugging to observe the contents of the queues. More...

std::vector< MemPacketQueue > &	selQueue (bool is_read)
	Select either the read or write queue. More...

virtual bool	respQEmpty ()

virtual void	pruneBurstTick ()
	Remove commands that have already issued from burstTicks. More...

virtual Tick	recvAtomicBackdoor (PacketPtr pkt, MemBackdoorPtr &backdoor)

bool	recvFunctionalLogic (PacketPtr pkt, MemInterface *mem_intr)

Tick	recvAtomicLogic (PacketPtr pkt, MemInterface *mem_intr)

Protected Member Functions inherited from gem5::memory::qos::MemCtrl
void	addRequestor (const RequestorID id)
	Initializes dynamically counters and statistics for a given Requestor. More...

void	logRequest (BusState dir, RequestorID id, uint8_t _qos, Addr addr, uint64_t entries)
	Called upon receiving a request or updates statistics and updates queues status. More...

void	logResponse (BusState dir, RequestorID id, uint8_t _qos, Addr addr, uint64_t entries, double delay)
	Called upon receiving a response, updates statistics and updates queues status. More...

template<typename Queues >
uint8_t	qosSchedule (std::initializer_list< Queues * > queues_ptr, uint64_t queue_entry_size, const PacketPtr pkt)
	Assign priority to a packet by executing the configured QoS policy. More...

uint8_t	schedule (RequestorID id, uint64_t data)

uint8_t	schedule (const PacketPtr pkt)

BusState	selectNextBusState ()
	Returns next bus direction (READ or WRITE) based on configured policy. More...

void	setCurrentBusState ()
	Set current bus direction (READ or WRITE) from next selected one. More...

void	recordTurnaroundStats ()
	Record statistics on turnarounds based on busStateNext and busState values. More...

template<typename Queues >
void	escalate (std::initializer_list< Queues * > queues, uint64_t queue_entry_size, RequestorID id, uint8_t tgt_prio)
	Escalates/demotes priority of all packets belonging to the passed requestor to given priority value. More...

template<typename Queues >
void	escalateQueues (Queues &queues, uint64_t queue_entry_size, RequestorID id, uint8_t curr_prio, uint8_t tgt_prio)
	Escalates/demotes priority of all packets belonging to the passed requestor to given priority value in a specified cluster of queues (e.g. More...

Protected Member Functions inherited from gem5::Drainable
	Drainable ()

virtual	~Drainable ()

void	signalDrainDone () const
	Signal that an object is drained. More...

Protected Member Functions inherited from gem5::Clocked
	Clocked (ClockDomain &clk_domain)
	Create a clocked object and set the clock domain based on the parameters. More...

	Clocked (Clocked &)=delete

Clocked &	operator= (Clocked &)=delete

virtual	~Clocked ()
	Virtual destructor due to inheritance. More...

void	resetClock () const
	Reset the object's clock using the current global tick value. More...

virtual void	clockPeriodUpdated ()
	A hook subclasses can implement so they can do any extra work that's needed when the clock rate is changed. More...

Private Member Functions
MemPacketQueue::iterator	chooseNext (MemPacketQueue &queue, Tick extra_col_delay, MemInterface *mem_int) override
	The memory schduler/arbiter - picks which request needs to go next, based on the specified policy such as FCFS or FR-FCFS and moves it to the head of the queue. More...

virtual std::pair< MemPacketQueue::iterator, Tick >	chooseNextFRFCFS (MemPacketQueue &queue, Tick extra_col_delay, MemInterface *mem_intr) override
	For FR-FCFS policy reorder the read/write queue depending on row buffer hits and earliest bursts available in memory. More...

Tick	doBurstAccess (MemPacket mem_pkt, MemInterface mem_int) override
	Actually do the burst based on media specific access function. More...

Tick	minReadToWriteDataGap () override
	Calculate the minimum delay used when scheduling a read-to-write transision. More...

Tick	minWriteToReadDataGap () override
	Calculate the minimum delay used when scheduling a write-to-read transision. More...

AddrRangeList	getAddrRanges () override

virtual Addr	burstAlign (Addr addr, MemInterface *mem_intr) const override
	Burst-align an address. More...

virtual bool	pktSizeCheck (MemPacket mem_pkt, MemInterface mem_intr) const override
	Check if mem pkt's size is sane. More...

virtual void	processRespondEvent (MemInterface *mem_intr, MemPacketQueue &queue, EventFunctionWrapper &resp_event, bool &retry_rd_req) override

virtual bool	memBusy (MemInterface *mem_intr) override
	Checks if the memory interface is already busy. More...

virtual void	nonDetermReads (MemInterface *mem_intr) override
	Will access nvm memory interface and select non-deterministic reads to issue. More...

virtual bool	nvmWriteBlock (MemInterface *mem_intr) override
	Will check if all writes are for nvm interface and nvm's write resp queue is full. More...

Private Attributes
NVMInterface *	nvm
	Create pointer to interface of the actual nvm media when connected. More...

Additional Inherited Members
Public Types inherited from gem5::memory::qos::MemCtrl
enum	BusState { READ , WRITE }
	Bus Direction. More...

Public Types inherited from gem5::ClockedObject
using	Params = ClockedObjectParams
	Parameters of ClockedObject. More...

Public Types inherited from gem5::SimObject
typedef SimObjectParams	Params

Static Public Member Functions inherited from gem5::SimObject
static void	serializeAll (const std::string &cpt_dir)
	Create a checkpoint by serializing all SimObjects in the system. More...

static SimObject *	find (const char *name)
	Find the SimObject with the given name and return a pointer to it. More...

static void	setSimObjectResolver (SimObjectResolver *resolver)
	There is a single object name resolver, and it is only set when simulation is restoring from checkpoints. More...

static SimObjectResolver *	getSimObjectResolver ()
	There is a single object name resolver, and it is only set when simulation is restoring from checkpoints. More...

Static Public Member Functions inherited from gem5::Serializable
static const std::string &	currentSection ()
	Gets the fully-qualified name of the active section. More...

static void	generateCheckpointOut (const std::string &cpt_dir, std::ofstream &outstream)
	Generate a checkpoint file so that the serialization can be routed to it. More...

Public Attributes inherited from gem5::ClockedObject
PowerState *	powerState

Protected Attributes inherited from gem5::memory::MemCtrl
MemoryPort	port
	Our incoming port, for a multi-ported controller add a crossbar in front of it. More...

bool	isTimingMode
	Remember if the memory system is in timing mode. More...

bool	retryRdReq
	Remember if we have to retry a request when available. More...

bool	retryWrReq

EventFunctionWrapper	nextReqEvent

EventFunctionWrapper	respondEvent

std::vector< MemPacketQueue >	readQueue
	The controller's main read and write queues, with support for QoS reordering. More...

std::vector< MemPacketQueue >	writeQueue

std::unordered_set< Addr >	isInWriteQueue
	To avoid iterating over the write queue to check for overlapping transactions, maintain a set of burst addresses that are currently queued. More...

std::deque< MemPacket * >	respQueue
	Response queue where read packets wait after we're done working with them, but it's not time to send the response yet. More...

std::unordered_multiset< Tick >	burstTicks
	Holds count of commands issued in burst window starting at defined Tick. More...

MemInterface *	dram

uint32_t	readBufferSize
	The following are basic design parameters of the memory controller, and are initialized based on parameter values. More...

uint32_t	writeBufferSize

uint32_t	writeHighThreshold

uint32_t	writeLowThreshold

const uint32_t	minWritesPerSwitch

const uint32_t	minReadsPerSwitch

uint32_t	writesThisTime

uint32_t	readsThisTime

enums::MemSched	memSchedPolicy
	Memory controller configuration initialized based on parameter values. More...

const Tick	frontendLatency
	Pipeline latency of the controller frontend. More...

const Tick	backendLatency
	Pipeline latency of the backend and PHY. More...

const Tick	commandWindow
	Length of a command window, used to check command bandwidth. More...

Tick	nextBurstAt
	Till when must we wait before issuing next RD/WR burst? More...

Tick	prevArrival

Tick	nextReqTime
	The soonest you have to start thinking about the next request is the longest access time that can occur before nextBurstAt. More...

CtrlStats	stats

std::unique_ptr< Packet >	pendingDelete
	Upstream caches need this packet until true is returned, so hold it for deletion until a subsequent call. More...

Protected Attributes inherited from gem5::memory::qos::MemCtrl
const std::unique_ptr< Policy >	policy
	QoS Policy, assigns QoS priority to the incoming packets. More...

const std::unique_ptr< TurnaroundPolicy >	turnPolicy
	QoS Bus Turnaround Policy: selects the bus direction (READ/WRITE) More...

const std::unique_ptr< QueuePolicy >	queuePolicy
	QoS Queue Policy: selects packet among same-priority queue. More...

const uint8_t	_numPriorities
	Number of configured QoS priorities. More...

const bool	qosPriorityEscalation
	Enables QoS priority escalation. More...

const bool	qosSyncroScheduler
	Enables QoS synchronized scheduling invokes the QoS scheduler on all requestors, at every packet arrival. More...

std::unordered_map< RequestorID, const std::string >	requestors
	Hash of requestor ID - requestor name. More...

std::unordered_map< RequestorID, std::vector< uint64_t > >	packetPriorities
	Hash of requestors - number of packets queued per priority. More...

std::unordered_map< RequestorID, std::unordered_map< uint64_t, std::deque< uint64_t > > >	requestTimes
	Hash of requestors - address of request - queue of times of request. More...

std::vector< Tick >	serviceTick
	Vector of QoS priorities/last service time. More...

std::vector< uint64_t >	readQueueSizes
	Read request packets queue length in #packets, per QoS priority. More...

std::vector< uint64_t >	writeQueueSizes
	Write request packets queue length in #packets, per QoS priority. More...

uint64_t	totalReadQueueSize
	Total read request packets queue length in #packets. More...

uint64_t	totalWriteQueueSize
	Total write request packets queue length in #packets. More...

BusState	busState
	Bus state used to control the read/write switching and drive the scheduling of the next request. More...

BusState	busStateNext
	bus state for next request event triggered More...

gem5::memory::qos::MemCtrl::MemCtrlStats	stats

System *	_system
	Pointer to the System object. More...

Protected Attributes inherited from gem5::SimObject
const SimObjectParams &	_params
	Cached copy of the object parameters. More...

Protected Attributes inherited from gem5::EventManager
EventQueue *	eventq
	A pointer to this object's event queue. More...

Detailed Description

Definition at line 57 of file hetero_mem_ctrl.hh.

Constructor & Destructor Documentation

◆ HeteroMemCtrl()

gem5::memory::HeteroMemCtrl::HeteroMemCtrl ( const HeteroMemCtrlParams & p )

Definition at line 60 of file hetero_mem_ctrl.cc.

References gem5::memory::MemCtrl::commandWindow, DPRINTF, gem5::memory::MemCtrl::dram, fatal, fatal_if, nvm, gem5::VegaISA::p, gem5::memory::MemCtrl::readBufferSize, gem5::memory::MemInterface::readBufferSize, gem5::memory::MemCtrl::readQueue, gem5::memory::MemInterface::setCtrl(), gem5::memory::MemCtrl::writeBufferSize, gem5::memory::MemInterface::writeBufferSize, gem5::memory::MemCtrl::writeHighThreshold, gem5::memory::MemCtrl::writeLowThreshold, and gem5::memory::MemCtrl::writeQueue.

Member Function Documentation

◆ allIntfDrained()

bool gem5::memory::HeteroMemCtrl::allIntfDrained ( ) const

overridevirtual

Ensure that all interfaced have drained commands.

Returns: bool flag, set once drain complete

Reimplemented from gem5::memory::MemCtrl.

Definition at line 405 of file hetero_mem_ctrl.cc.

References gem5::memory::MemInterface::allRanksDrained(), gem5::memory::NVMInterface::allRanksDrained(), gem5::memory::MemCtrl::dram, and nvm.

Referenced by drain().

◆ burstAlign()

Addr gem5::memory::HeteroMemCtrl::burstAlign	(	Addr	addr,
		MemInterface *	mem_intr
	)		const

overrideprivatevirtual

Burst-align an address.

Parameters

addr	The potentially unaligned address
mem_intr	The DRAM memory interface this packet belongs to

Returns: An address aligned to a memory burst

Reimplemented from gem5::memory::MemCtrl.

Definition at line 366 of file hetero_mem_ctrl.cc.

References gem5::X86ISA::addr, gem5::memory::MemInterface::bytesPerBurst(), gem5::AddrRange::contains(), gem5::memory::AbstractMemory::getAddrRange(), and nvm.

◆ chooseNext()

MemPacketQueue::iterator gem5::memory::HeteroMemCtrl::chooseNext	(	MemPacketQueue &	queue,
		Tick	extra_col_delay,
		MemInterface *	mem_intr
	)

overrideprivatevirtual

The memory schduler/arbiter - picks which request needs to go next, based on the specified policy such as FCFS or FR-FCFS and moves it to the head of the queue.

Prioritizes accesses to the same rank as previous burst unless controller is switching command type.

Parameters

queue	Queued requests to consider
extra_col_delay	Any extra delay due to a read/write switch
mem_intr	the memory interface to choose from

Returns: an iterator to the selected packet, else queue.end()

Reimplemented from gem5::memory::MemCtrl.

Definition at line 212 of file hetero_mem_ctrl.cc.

References chooseNextFRFCFS(), DPRINTF, gem5::memory::MemCtrl::dram, gem5::ArmISA::i, gem5::memory::MemPacket::isDram(), gem5::memory::MemCtrl::memSchedPolicy, nvm, gem5::memory::MemCtrl::packetReady(), and panic.

◆ chooseNextFRFCFS()

std::pair< MemPacketQueue::iterator, Tick > gem5::memory::HeteroMemCtrl::chooseNextFRFCFS	(	MemPacketQueue &	queue,
		Tick	extra_col_delay,
		MemInterface *	mem_intr
	)

overrideprivatevirtual

For FR-FCFS policy reorder the read/write queue depending on row buffer hits and earliest bursts available in memory.

Parameters

queue	Queued requests to consider
extra_col_delay	Any extra delay due to a read/write switch

Returns: an iterator to the selected packet, else queue.end()

Reimplemented from gem5::memory::MemCtrl.

Definition at line 250 of file hetero_mem_ctrl.cc.

References gem5::memory::MemCtrl::chooseNextFRFCFS(), gem5::memory::MemCtrl::dram, gem5::MaxTick, and nvm.

Referenced by chooseNext().

◆ doBurstAccess()

Tick gem5::memory::HeteroMemCtrl::doBurstAccess	(	MemPacket *	mem_pkt,
		MemInterface *	mem_intr
	)

overrideprivatevirtual

Actually do the burst based on media specific access function.

Update bus statistics when complete.

Parameters

mem_pkt	The memory packet created from the outside world pkt
mem_intr	The memory interface to access

Returns: Time when the command was issued

Reimplemented from gem5::memory::MemCtrl.

Definition at line 278 of file hetero_mem_ctrl.cc.

References gem5::memory::NVMInterface::addRankToRankDelay(), gem5::memory::MemInterface::addRankToRankDelay(), gem5::memory::MemCtrl::doBurstAccess(), gem5::memory::MemCtrl::dram, gem5::memory::MemPacket::isDram(), gem5::memory::MemInterface::nextBurstAt, gem5::memory::MemInterface::nextReqTime, and nvm.

◆ drain()

DrainState gem5::memory::HeteroMemCtrl::drain ( )

overridevirtual

Draining is the process of clearing out the states of SimObjects.These are the SimObjects that are partially executed or are partially in flight.

Draining is mostly used before forking and creating a check point.

This function notifies an object that it needs to drain its state.

If the object does not need further simulation to drain internal buffers, it returns DrainState::Drained and automatically switches to the Drained state. If the object needs more simulation, it returns DrainState::Draining and automatically enters the Draining state. Other return values are invalid.

Note: An object that has entered the Drained state can be disturbed by other objects in the system and consequently stop being drained. These perturbations are not visible in the drain state. The simulator therefore repeats the draining process until all objects return DrainState::Drained on the first call to drain().

Returns: DrainState::Drained if the object is drained at this point in time, DrainState::Draining if it needs further simulation.

Implements gem5::Drainable.

Definition at line 416 of file hetero_mem_ctrl.cc.

References allIntfDrained(), gem5::curTick(), DPRINTF, gem5::Drained, gem5::Draining, gem5::memory::MemInterface::drainRanks(), gem5::memory::MemCtrl::dram, gem5::memory::MemCtrl::nextReqEvent, gem5::memory::MemCtrl::respQueue, gem5::memory::qos::MemCtrl::schedule(), gem5::Event::scheduled(), gem5::memory::qos::MemCtrl::totalReadQueueSize, and gem5::memory::qos::MemCtrl::totalWriteQueueSize.

◆ drainResume()

void gem5::memory::HeteroMemCtrl::drainResume ( )

overridevirtual

Resume execution after a successful drain.

Reimplemented from gem5::memory::MemCtrl.

Definition at line 442 of file hetero_mem_ctrl.cc.

References gem5::memory::MemCtrl::dram, gem5::memory::MemCtrl::isTimingMode, gem5::System::isTimingMode(), gem5::SimObject::startup(), gem5::memory::MemCtrl::startup(), gem5::memory::MemInterface::suspend(), and gem5::memory::qos::MemCtrl::system().

◆ getAddrRanges()

AddrRangeList gem5::memory::HeteroMemCtrl::getAddrRanges ( )

overrideprivatevirtual

Reimplemented from gem5::memory::MemCtrl.

Definition at line 460 of file hetero_mem_ctrl.cc.

References gem5::memory::MemCtrl::dram, gem5::memory::AbstractMemory::getAddrRange(), and nvm.

◆ memBusy()

bool gem5::memory::HeteroMemCtrl::memBusy ( MemInterface * mem_intr )

overrideprivatevirtual

Checks if the memory interface is already busy.

Parameters

mem_intr memory interface to check

Returns: a boolean indicating if memory is busy

Reimplemented from gem5::memory::MemCtrl.

Definition at line 306 of file hetero_mem_ctrl.cc.

References gem5::memory::NVMInterface::isBusy(), gem5::memory::MemInterface::isBusy(), gem5::memory::MemInterface::numWritesQueued, nvm, gem5::memory::qos::MemCtrl::totalReadQueueSize, and gem5::memory::qos::MemCtrl::totalWriteQueueSize.

◆ minReadToWriteDataGap()

Tick gem5::memory::HeteroMemCtrl::minReadToWriteDataGap ( )

overrideprivatevirtual

Calculate the minimum delay used when scheduling a read-to-write transision.

Parameters

return minimum delay

Reimplemented from gem5::memory::MemCtrl.

Definition at line 352 of file hetero_mem_ctrl.cc.

References gem5::memory::MemCtrl::dram, gem5::memory::MemInterface::minReadToWriteDataGap(), and nvm.

◆ minWriteToReadDataGap()

Tick gem5::memory::HeteroMemCtrl::minWriteToReadDataGap ( )

overrideprivatevirtual

Calculate the minimum delay used when scheduling a write-to-read transision.

Parameters

return minimum delay

Reimplemented from gem5::memory::MemCtrl.

Definition at line 359 of file hetero_mem_ctrl.cc.

References gem5::memory::MemCtrl::dram, gem5::memory::MemInterface::minWriteToReadDataGap(), and nvm.

◆ nonDetermReads()

void gem5::memory::HeteroMemCtrl::nonDetermReads ( MemInterface * mem_intr )

overrideprivatevirtual

Will access nvm memory interface and select non-deterministic reads to issue.

Reimplemented from gem5::memory::MemCtrl.

Definition at line 334 of file hetero_mem_ctrl.cc.

References gem5::memory::MemCtrl::nonDetermReads(), and nvm.

◆ nvmWriteBlock()

bool gem5::memory::HeteroMemCtrl::nvmWriteBlock ( MemInterface * mem_intr )

overrideprivatevirtual

Will check if all writes are for nvm interface and nvm's write resp queue is full.

Parameters

mem_intr memory interface to use

Returns: a boolean showing if nvm is blocked with writes

Reimplemented from gem5::memory::MemCtrl.

Definition at line 343 of file hetero_mem_ctrl.cc.

References nvm, and gem5::memory::MemCtrl::nvmWriteBlock().

◆ pktSizeCheck()

bool gem5::memory::HeteroMemCtrl::pktSizeCheck	(	MemPacket *	mem_pkt,
		MemInterface *	mem_intr
	)		const

overrideprivatevirtual

Check if mem pkt's size is sane.

Parameters

mem_pkt	memory packet
mem_intr	memory interface

Returns: a boolean indicating if the mem pkt size is less than the burst size of the related mem interface

Reimplemented from gem5::memory::MemCtrl.

Definition at line 378 of file hetero_mem_ctrl.cc.

References gem5::memory::MemInterface::bytesPerBurst(), gem5::memory::MemPacket::isDram(), nvm, and gem5::memory::MemPacket::size.

◆ processRespondEvent()

void gem5::memory::HeteroMemCtrl::processRespondEvent	(	MemInterface *	mem_intr,
		MemPacketQueue &	queue,
		EventFunctionWrapper &	resp_event,
		bool &	retry_rd_req
	)