Internal class to bridge between an incoming snoop response from a CPU-side port and forwarding it through an outgoing CPU-side port. More...

#include <coherent_xbar.hh>

Inheritance diagram for gem5::CoherentXBar::SnoopRespPort:

Public Member Functions
	SnoopRespPort (QueuedResponsePort &cpu_side_port, CoherentXBar &_xbar)
	Create a snoop response port that mirrors a given CPU-side port.

void	sendRetryResp () override
	Override the sending of retries and pass them on through the mirrored CPU-side port.

void	recvReqRetry () override
	Called by the peer if sendTimingReq was called on this peer (causing recvTimingReq to be called on the peer) and was unsuccessful.

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

Public Member Functions inherited from gem5::RequestPort
	RequestPort (const std::string &name, SimObject *_owner, PortID id=InvalidPortID)
	Request port.

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

virtual	~RequestPort ()

void	bind (Port &peer) override
	Bind this request port to a response port.

void	unbind () override
	Unbind this request port and the associated response port.

virtual bool	isSnooping () const
	Determine if this request port is snooping or not.

AddrRangeList	getAddrRanges () const
	Get the address ranges of the connected responder port.

void	printAddr (Addr a)
	Inject a PrintReq for the given address to print the state of that address throughout the memory system.

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

Tick	sendAtomicBackdoor (PacketPtr pkt, MemBackdoorPtr &backdoor)
	Send an atomic request packet like above, but also request a backdoor to the data being accessed.

void	sendFunctional (PacketPtr pkt) const
	Send a functional 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.

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

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

bool	tryTiming (PacketPtr pkt) const
	Check if the responder can handle a timing request.

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

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.

Private Attributes
QueuedResponsePort &	cpuSidePort
	The port which we mirror internally.

Additional Inherited Members
Protected Member Functions inherited from gem5::RequestPort
virtual void	recvRangeChange ()
	Called to receive an address range change from the peer response port.

Tick	recvAtomicSnoop (PacketPtr pkt) override
	Default implementations.

void	recvFunctionalSnoop (PacketPtr pkt) override
	Receive a functional snoop request packet from the peer.

void	recvTimingSnoopReq (PacketPtr pkt) override
	Receive a timing snoop request from the peer.

void	recvRetrySnoopResp () override
	Called by the peer if sendTimingSnoopResp was called on this protocol (causing recvTimingSnoopResp to be called on the peer) and was unsuccessful.

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::AtomicRequestProtocol
Tick	send (AtomicResponseProtocol *peer, PacketPtr pkt)
	Send an atomic request packet, where the data is moved and the state is updated in zero time, without interleaving with other memory accesses.

Tick	sendBackdoor (AtomicResponseProtocol *peer, PacketPtr pkt, MemBackdoorPtr &backdoor)
	Send an atomic request packet like above, but also request a backdoor to the data being accessed.

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

bool	trySend (TimingResponseProtocol *peer, PacketPtr pkt) const
	Check if the peer can handle a timing request.

bool	sendSnoopResp (TimingResponseProtocol *peer, PacketPtr pkt)
	Attempt to send a timing snoop response packet to it's peer by calling its corresponding receive function.

void	sendRetryResp (TimingResponseProtocol *peer)
	Send a retry to the peer that previously attempted a sendTimingResp to this protocol and failed.

Protected Member Functions inherited from gem5::FunctionalRequestProtocol
void	send (FunctionalResponseProtocol *peer, PacketPtr pkt) const
	Send a functional 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.

void	sendMemBackdoorReq (FunctionalResponseProtocol *peer, const MemBackdoorReq &req, MemBackdoorPtr &backdoor)
	Send a request for a back door to a range of memory.

Protected Attributes inherited from gem5::RequestPort
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.

Detailed Description

Internal class to bridge between an incoming snoop response from a CPU-side port and forwarding it through an outgoing CPU-side port.

It is effectively a dangling memory-side port.

Definition at line 216 of file coherent_xbar.hh.

Constructor & Destructor Documentation

◆ SnoopRespPort()

gem5::CoherentXBar::SnoopRespPort::SnoopRespPort	(	QueuedResponsePort &	cpu_side_port,
		CoherentXBar &	_xbar )

inline

Create a snoop response port that mirrors a given CPU-side port.

Definition at line 229 of file coherent_xbar.hh.

Member Function Documentation

◆ recvReqRetry()

void gem5::CoherentXBar::SnoopRespPort::recvReqRetry ( )

inlineoverridevirtual

Called by the peer if sendTimingReq was called on this peer (causing recvTimingReq to be called on the peer) and was unsuccessful.

Implements gem5::TimingRequestProtocol.

Definition at line 246 of file coherent_xbar.hh.

References panic.

◆ recvTimingResp()

bool gem5::CoherentXBar::SnoopRespPort::recvTimingResp ( PacketPtr pkt )

inlineoverridevirtual

Receive a timing response from the peer.

Implements gem5::TimingRequestProtocol.

Definition at line 252 of file coherent_xbar.hh.

References panic.

◆ sendRetryResp()

void gem5::CoherentXBar::SnoopRespPort::sendRetryResp ( )

inlineoverridevirtual

Override the sending of retries and pass them on through the mirrored CPU-side port.

Reimplemented from gem5::RequestPort.

Definition at line 239 of file coherent_xbar.hh.

References cpuSidePort, and gem5::ResponsePort::sendRetrySnoopResp().

Member Data Documentation

◆ cpuSidePort

QueuedResponsePort& gem5::CoherentXBar::SnoopRespPort::cpuSidePort

private

The port which we mirror internally.

Definition at line 222 of file coherent_xbar.hh.

Referenced by sendRetryResp().

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

mem/coherent_xbar.hh

Public Member Functions

Private Attributes

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

◆ SnoopRespPort()

Member Function Documentation

◆ recvReqRetry()

◆ recvTimingResp()

◆ sendRetryResp()

Member Data Documentation

◆ cpuSidePort