A ResponsePort is a specialization of a port. More...

#include <port.hh>

Inheritance diagram for gem5::ResponsePort:

Public Member Functions
	ResponsePort (const std::string &name, SimObject *_owner, PortID id=InvalidPortID)
	Response port.

	ResponsePort (const std::string &name, PortID id=InvalidPortID)

virtual	~ResponsePort ()

bool	isSnooping () const
	Find out if the peer request port is snooping or not.

void	sendRangeChange () const
	Called by the owner to send a range change.

virtual AddrRangeList	getAddrRanges () const =0
	Get a list of the non-overlapping address ranges the owner is responsible for.

void	unbind () override
	We let the request port do the work, so these don't do anything.

void	bind (Port &peer) override
	Attach to a peer port.

Tick	sendAtomicSnoop (PacketPtr pkt)
	Send an atomic snoop request packet, where the data is moved and the state is updated in zero time, without interleaving with other memory accesses.

void	sendFunctionalSnoop (PacketPtr pkt) const
	Send a functional snoop request packet, where the data is instantly updated everywhere in the memory system, without affecting the current state of any block or moving the block.

bool	sendTimingResp (PacketPtr pkt)
	Attempt to send a timing response to the request port by calling its corresponding receive function.

void	sendTimingSnoopReq (PacketPtr pkt)
	Attempt to send a timing snoop request packet to the request port by calling its corresponding receive function.

void	sendRetryReq ()
	Send a retry to the request port that previously attempted a sendTimingReq to this response port and failed.

void	sendRetrySnoopResp ()
	Send a retry to the request port that previously attempted a sendTimingSnoopResp to this response port and failed.

Public Member Functions inherited from gem5::Port
virtual	~Port ()
	Virtual destructor due to inheritance.

Port &	getPeer ()
	Return a reference to this port's peer.

const std::string	name () const
	Return port name (for DPRINTF).

PortID	getId () const
	Get the port id.

bool	isConnected () const
	Is this port currently connected to a peer?

void	takeOverFrom (Port *old)
	A utility function to make it easier to swap out ports.

Protected Member Functions
void	responderUnbind ()
	Called by the request port to unbind.

void	responderBind (RequestPort &request_port)
	Called by the request port to bind.

Tick	recvAtomicBackdoor (PacketPtr pkt, MemBackdoorPtr &backdoor) override
	Default implementations.

void	recvMemBackdoorReq (const MemBackdoorReq &req, MemBackdoorPtr &backdoor) override
	Receive a request for a back door to a range of memory.

bool	tryTiming (PacketPtr pkt) override
	Availability request from the peer.

bool	recvTimingSnoopResp (PacketPtr pkt) override
	Receive a timing snoop response from the peer.

Protected Member Functions inherited from gem5::Port
void	reportUnbound () const

	Port (const std::string &_name, PortID _id)
	Abstract base class for ports.

Protected Member Functions inherited from gem5::AtomicResponseProtocol
Tick	sendSnoop (AtomicRequestProtocol *peer, PacketPtr pkt)
	Send an atomic snoop request packet, where the data is moved and the state is updated in zero time, without interleaving with other memory accesses.

virtual Tick	recvAtomic (PacketPtr pkt)=0
	Receive an atomic request packet from the peer.

Protected Member Functions inherited from gem5::TimingResponseProtocol
bool	sendResp (TimingRequestProtocol *peer, PacketPtr pkt)
	Attempt to send a timing response to the peer by calling its corresponding receive function.

void	sendSnoopReq (TimingRequestProtocol *peer, PacketPtr pkt)
	Attempt to send a timing snoop request packet to the peer by calling its corresponding receive function.

void	sendRetryReq (TimingRequestProtocol *peer)
	Send a retry to the peer that previously attempted a sendTimingReq to this protocol and failed.

void	sendRetrySnoopResp (TimingRequestProtocol *peer)
	Send a retry to the peer that previously attempted a sendTimingSnoopResp to this peer and failed.

virtual bool	recvTimingReq (PacketPtr pkt)=0
	Receive a timing request from the peer.

virtual void	recvRespRetry ()=0
	Called by the peer if sendTimingResp was called on this protocol (causing recvTimingResp to be called on the peer) and was unsuccessful.

Protected Member Functions inherited from gem5::FunctionalResponseProtocol
void	sendSnoop (FunctionalRequestProtocol *peer, PacketPtr pkt) const
	Send a functional snoop request packet, where the data is instantly updated everywhere in the memory system, without affecting the current state of any block or moving the block.

virtual void	recvFunctional (PacketPtr pkt)=0
	Receive a functional request packet from the peer.

Protected Attributes
SimObject &	owner

Protected Attributes inherited from gem5::Port
const PortID	id
	A numeric identifier to distinguish ports in a vector, and set to InvalidPortID in case this port is not part of a vector.

Port *	_peer
	A pointer to this port's peer.

bool	_connected
	Whether this port is currently connected to a peer port.

Private Attributes
RequestPort *	_requestPort

bool	defaultBackdoorWarned

Friends
class	RequestPort

Detailed Description

A ResponsePort is a specialization of a port.

In addition to the basic functionality of sending packets to its requestor peer, it also has functions specific to a responder, e.g. to send range changes and get the address ranges that the port responds to.

The three protocols are atomic, timing, and functional, each with its own header file.

Definition at line 347 of file port.hh.

Constructor & Destructor Documentation

◆ ResponsePort() [1/2]

gem5::ResponsePort::ResponsePort	(	const std::string &	name,
		SimObject *	_owner,
		PortID	id = InvalidPortID )

Response port.

Definition at line 218 of file port.cc.

◆ ResponsePort() [2/2]

gem5::ResponsePort::ResponsePort	(	const std::string &	name,
		PortID	id = InvalidPortID )

Definition at line 235 of file port.cc.

◆ ~ResponsePort()

gem5::ResponsePort::~ResponsePort ( )

virtual

Definition at line 243 of file port.cc.

Member Function Documentation

◆ bind()

void gem5::ResponsePort::bind ( Port & peer )

inlineoverridevirtual

Attach to a peer port.

Reimplemented from gem5::Port.

Reimplemented in gem5::TokenResponsePort.

Definition at line 395 of file port.hh.

◆ getAddrRanges()

virtual AddrRangeList gem5::ResponsePort::getAddrRanges ( ) const

pure virtual

Get a list of the non-overlapping address ranges the owner is responsible for.

All response ports must override this function and return a populated list with at least one item.

Returns: a list of ranges responded to

Implemented in gem5::AddrMapper::MapperResponsePort, gem5::BaseCache::CpuSidePort, gem5::Bridge::BridgeResponsePort, gem5::CoherentXBar::CoherentXBarResponsePort, gem5::CommMonitor::MonitorResponsePort, gem5::ExternalSlave::ExternalPort, gem5::LdsState::CuSidePort, gem5::MemCheckerMonitor::MonitorResponsePort, gem5::MemDelay::ResponsePort, gem5::memory::CfiMemory::MemoryPort, gem5::memory::DRAMSim2::MemoryPort, gem5::memory::DRAMsim3::MemoryPort, gem5::memory::MemCtrl::MemoryPort, gem5::memory::qos::MemSinkCtrl::MemoryPort, gem5::memory::SimpleMemory::MemoryPort, gem5::NoncoherentXBar::NoncoherentXBarResponsePort, gem5::OutgoingRequestBridge::OutgoingRequestPort, gem5::PioPort< Device >, gem5::PioPort< gem5::PioDevice >, gem5::PioPort< gem5::X86ISA::Interrupts >, gem5::ResponsePortWrapper, gem5::ruby::GPUCoalescer::GMTokenPort, gem5::ruby::RubyPort::MemResponsePort, gem5::ruby::RubyPort::PioResponsePort, gem5::SerialLink::SerialLinkResponsePort, gem5::SimpleCache::CPUSidePort, gem5::SimpleMemobj::CPUSidePort, gem5::SMMUATSDevicePort, gem5::SMMUControlPort, gem5::SMMUDevicePort, gem5::SysBridge::SysBridgeSourcePort, gem5::ThreadBridge::IncomingPort, gem5::TLBCoalescer::CpuSidePort, gem5::VegaISA::GpuTLB::CpuSidePort, gem5::VegaTLBCoalescer::CpuSidePort, gem5::X86ISA::GpuTLB::CpuSidePort, gem5::X86ISA::IntResponsePort< Device >, gem5::X86ISA::IntResponsePort< gem5::X86ISA::Interrupts >, and sc_gem5::Gem5ToTlmBridge< BITWIDTH >::BridgeResponsePort.

Referenced by gem5::RequestPort::getAddrRanges().

◆ isSnooping()

bool gem5::ResponsePort::isSnooping ( ) const

inline

Find out if the peer request port is snooping or not.

Returns: true if the peer request port is snooping

Definition at line 375 of file port.hh.

References _requestPort, and gem5::RequestPort::isSnooping().

Referenced by gem5::BaseCache::functionalAccess(), gem5::BaseCache::init(), gem5::AddrMapper::isSnooping(), gem5::CommMonitor::isSnooping(), gem5::MemCheckerMonitor::isSnooping(), gem5::MemDelay::RequestPort::isSnooping(), gem5::SnoopFilter::lookupRequest(), gem5::SnoopFilter::portToMask(), gem5::SnoopFilter::updateResponse(), and gem5::SnoopFilter::updateSnoopResponse().

◆ recvAtomicBackdoor()

Tick gem5::ResponsePort::recvAtomicBackdoor	(	PacketPtr	pkt,
		MemBackdoorPtr &	backdoor )

overrideprotectedvirtual

Default implementations.

Implements gem5::AtomicResponseProtocol.

Reimplemented in gem5::ResponsePortWrapper, and gem5::SysBridge::SysBridgeSourcePort.

Definition at line 262 of file port.cc.

References defaultBackdoorWarned, DPRINTF, gem5::Port::name(), and gem5::AtomicResponseProtocol::recvAtomic().

Referenced by gem5::ResponsePortWrapper::recvAtomicBackdoor().

◆ recvMemBackdoorReq()

void gem5::ResponsePort::recvMemBackdoorReq	(	const MemBackdoorReq &	req,
		MemBackdoorPtr &	backdoor )

overrideprotectedvirtual

Receive a request for a back door to a range of memory.

Parameters

req	An object which describes what back door is being requested.
backdoor	Can be set to a back door pointer by the target to let caller have direct access to the requested range.

Implements gem5::FunctionalResponseProtocol.

Reimplemented in gem5::ResponsePortWrapper, and gem5::SysBridge::SysBridgeSourcePort.

Definition at line 273 of file port.cc.

References defaultBackdoorWarned, DPRINTF, and gem5::Port::name().

Referenced by gem5::ResponsePortWrapper::recvMemBackdoorReq().

◆ recvTimingSnoopResp()

bool gem5::ResponsePort::recvTimingSnoopResp ( PacketPtr pkt )

inlineoverrideprotectedvirtual

Receive a timing snoop response from the peer.

Implements gem5::TimingResponseProtocol.

Reimplemented in gem5::StubSlavePort, and gem5::SysBridge::SysBridgeSourcePort.

Definition at line 539 of file port.hh.

References gem5::Port::name(), and panic.

◆ responderBind()

void gem5::ResponsePort::responderBind ( RequestPort & request_port )

protected

Called by the request port to bind.

Should never be called directly.

Definition at line 255 of file port.cc.

References _requestPort, and gem5::Port::bind().

◆ responderUnbind()

void gem5::ResponsePort::responderUnbind ( )

protected

Called by the request port to unbind.

Should never be called directly.

Definition at line 248 of file port.cc.

References _requestPort, and gem5::Port::unbind().

Referenced by gem5::RequestPort::unbind(), and gem5::TokenResponsePort::unbind().

◆ sendAtomicSnoop()

Tick gem5::ResponsePort::sendAtomicSnoop ( PacketPtr pkt )

inline

Send an atomic snoop request packet, where the data is moved and the state is updated in zero time, without interleaving with other memory accesses.

Parameters

pkt	Snoop packet to send.

Returns: Estimated latency of access.

Definition at line 410 of file port.hh.

References _requestPort, gem5::Port::reportUnbound(), and gem5::AtomicResponseProtocol::sendSnoop().

Referenced by gem5::Cache::handleSnoop(), gem5::Cache::isCachedAbove(), gem5::AddrMapper::recvAtomicSnoop(), gem5::CommMonitor::recvAtomicSnoop(), and gem5::SysBridge::SysBridgeTargetPort::recvAtomicSnoop().

◆ sendFunctionalSnoop()

void gem5::ResponsePort::sendFunctionalSnoop ( PacketPtr pkt ) const

inline

Send a functional snoop request packet, where the data is instantly updated everywhere in the memory system, without affecting the current state of any block or moving the block.

Parameters

pkt	Snoop packet to send.

Definition at line 430 of file port.hh.

References _requestPort, gem5::Port::reportUnbound(), and gem5::FunctionalResponseProtocol::sendSnoop().

Referenced by gem5::BaseCache::functionalAccess(), gem5::AddrMapper::recvFunctionalSnoop(), gem5::CommMonitor::recvFunctionalSnoop(), gem5::MemCheckerMonitor::recvFunctionalSnoop(), and gem5::SysBridge::SysBridgeTargetPort::recvFunctionalSnoop().

◆ sendRangeChange()

void gem5::ResponsePort::sendRangeChange ( ) const

inline

Called by the owner to send a range change.

Definition at line 380 of file port.hh.

References _requestPort, and gem5::RequestPort::recvRangeChange().

Referenced by gem5::BaseCache::init(), gem5::Bridge::init(), gem5::ExternalSlave::init(), gem5::memory::CfiMemory::init(), gem5::memory::DRAMSim2::init(), gem5::memory::DRAMsim3::init(), gem5::memory::MemCtrl::init(), gem5::memory::qos::MemSinkCtrl::init(), gem5::memory::SimpleMemory::init(), gem5::OutgoingRequestBridge::init(), gem5::RangeAddrMapper::init(), gem5::ruby::RubyPort::init(), gem5::SerialLink::init(), gem5::SMMUv3::init(), gem5::AddrMapper::recvRangeChange(), gem5::CommMonitor::recvRangeChange(), gem5::MemCheckerMonitor::recvRangeChange(), gem5::MemDelay::RequestPort::recvRangeChange(), gem5::SysBridge::SysBridgeTargetPort::recvRangeChange(), gem5::SMMUv3DeviceInterface::sendRange(), and gem5::SimpleMemobj::sendRangeChange().

◆ sendRetryReq()

void gem5::ResponsePort::sendRetryReq ( )

inline

Send a retry to the request port that previously attempted a sendTimingReq to this response port and failed.

Definition at line 489 of file port.hh.

References _requestPort, gem5::Port::reportUnbound(), and gem5::TimingResponseProtocol::sendRetryReq().

Referenced by gem5::SMMUv3DeviceInterface::atsSendDeviceRetry(), gem5::memory::MemCtrl::processNextReqEvent(), gem5::memory::qos::MemSinkCtrl::processNextReqEvent(), gem5::memory::MemCtrl::processRespondEvent(), gem5::StubSlavePort::processResponseEvent(), gem5::AddrMapper::recvReqRetry(), gem5::CommMonitor::recvReqRetry(), gem5::MemCheckerMonitor::recvReqRetry(), gem5::SysBridge::SysBridgeTargetPort::recvReqRetry(), gem5::memory::CfiMemory::release(), gem5::memory::SimpleMemory::release(), gem5::SMMUv3DeviceInterface::sendDeviceRetry(), gem5::BaseXBar::ReqLayer::sendRetry(), gem5::memory::DRAMSim2::tick(), and gem5::memory::DRAMsim3::tick().

◆ sendRetrySnoopResp()

void gem5::ResponsePort::sendRetrySnoopResp ( )

inline

Send a retry to the request port that previously attempted a sendTimingSnoopResp to this response port and failed.

Definition at line 503 of file port.hh.

References _requestPort, gem5::Port::reportUnbound(), and gem5::TimingResponseProtocol::sendRetrySnoopResp().

Referenced by gem5::CommMonitor::recvRetrySnoopResp(), gem5::SysBridge::SysBridgeTargetPort::recvRetrySnoopResp(), gem5::BaseXBar::SnoopRespLayer::sendRetry(), and gem5::CoherentXBar::SnoopRespPort::sendRetryResp().

◆ sendTimingResp()

bool gem5::ResponsePort::sendTimingResp ( PacketPtr pkt )

inline

Attempt to send a timing response to the request port by calling its corresponding receive function.

If the send does not succeed, as indicated by the return value, then the sender must wait for a recvRespRetry at which point it can re-issue a sendTimingResp.

Parameters

pkt	Packet to send.

Returns: If the send was successful or not.

Definition at line 454 of file port.hh.

References _requestPort, gem5::RequestPort::addTrace(), gem5::RequestPort::removeTrace(), gem5::Port::reportUnbound(), gem5::TimingResponseProtocol::sendResp(), and gem5::RiscvISA::succ.

Referenced by gem5::ruby::PendingWriteInst::ackWriteCompletion(), gem5::memory::CfiMemory::dequeue(), gem5::memory::SimpleMemory::dequeue(), gem5::LdsState::process(), gem5::StubSlavePort::processResponseEvent(), gem5::TokenResponsePort::recvRespRetry(), gem5::AddrMapper::recvTimingResp(), gem5::CommMonitor::recvTimingResp(), gem5::MemCheckerMonitor::recvTimingResp(), gem5::SysBridge::SysBridgeTargetPort::recvTimingResp(), gem5::SimpleCache::CPUSidePort::sendPacket(), gem5::SimpleMemobj::CPUSidePort::sendPacket(), gem5::memory::DRAMSim2::sendResponse(), gem5::memory::DRAMsim3::sendResponse(), gem5::RespPacketQueue::sendTiming(), gem5::OutgoingRequestBridge::sendTimingResp(), gem5::TokenResponsePort::sendTimingResp(), gem5::TLBCoalescer::updatePhysAddresses(), and gem5::VegaTLBCoalescer::updatePhysAddresses().

◆ sendTimingSnoopReq()

void gem5::ResponsePort::sendTimingSnoopReq ( PacketPtr pkt )

inline

Attempt to send a timing snoop request packet to the request port by calling its corresponding receive function.

Snoop requests always succeed and hence no return value is needed.

Parameters

pkt	Packet to send.

Definition at line 475 of file port.hh.

References _requestPort, gem5::Port::reportUnbound(), and gem5::TimingResponseProtocol::sendSnoopReq().

Referenced by gem5::Cache::handleSnoop(), gem5::Cache::isCachedAbove(), gem5::AddrMapper::recvTimingSnoopReq(), gem5::CommMonitor::recvTimingSnoopReq(), gem5::MemCheckerMonitor::recvTimingSnoopReq(), gem5::SysBridge::SysBridgeTargetPort::recvTimingSnoopReq(), gem5::Cache::sendMSHRQueuePacket(), and gem5::OutgoingRequestBridge::sendTimingSnoopReq().

◆ tryTiming()

bool gem5::ResponsePort::tryTiming ( PacketPtr pkt )

inlineoverrideprotectedvirtual

Availability request from the peer.

Implements gem5::TimingResponseProtocol.

Reimplemented in gem5::SysBridge::SysBridgeSourcePort.

Definition at line 533 of file port.hh.

References gem5::Port::name(), and panic.

◆ unbind()

void gem5::ResponsePort::unbind ( )

inlineoverridevirtual

We let the request port do the work, so these don't do anything.

Reimplemented from gem5::Port.

Reimplemented in gem5::TokenResponsePort.

Definition at line 394 of file port.hh.

Friends And Related Symbol Documentation

◆ RequestPort

friend class RequestPort

friend

Definition at line 350 of file port.hh.

Member Data Documentation

◆ _requestPort

RequestPort* gem5::ResponsePort::_requestPort

private

Definition at line 353 of file port.hh.

Referenced by isSnooping(), responderBind(), responderUnbind(), sendAtomicSnoop(), sendFunctionalSnoop(), sendRangeChange(), sendRetryReq(), sendRetrySnoopResp(), sendTimingResp(), and sendTimingSnoopReq().

◆ defaultBackdoorWarned

bool gem5::ResponsePort::defaultBackdoorWarned

private

Definition at line 355 of file port.hh.

Referenced by recvAtomicBackdoor(), and recvMemBackdoorReq().

◆ owner

SimObject& gem5::ResponsePort::owner

protected

Definition at line 358 of file port.hh.

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

mem/port.hh
mem/port.cc

Public Member Functions

Protected Member Functions

Protected Attributes

Private Attributes

Friends

Detailed Description

Constructor & Destructor Documentation

◆ ResponsePort() [1/2]

◆ ResponsePort() [2/2]

◆ ~ResponsePort()

Member Function Documentation

◆ bind()

◆ getAddrRanges()

◆ isSnooping()

◆ recvAtomicBackdoor()

◆ recvMemBackdoorReq()

◆ recvTimingSnoopResp()

◆ responderBind()

◆ responderUnbind()

◆ sendAtomicSnoop()

◆ sendFunctionalSnoop()

◆ sendRangeChange()

◆ sendRetryReq()

◆ sendRetrySnoopResp()

◆ sendTimingResp()

◆ sendTimingSnoopReq()

◆ tryTiming()

◆ unbind()

Friends And Related Symbol Documentation

◆ RequestPort

Member Data Documentation

◆ _requestPort

◆ defaultBackdoorWarned

◆ owner