gem5 v24.0.0.0
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gem5::BaseCache::CacheRequestPort Class Reference

A cache request port is used for the memory-side port of the cache, and in addition to the basic timing port that only sends response packets through a transmit list, it also offers the ability to schedule and send request packets (requests & writebacks). More...

#include <base.hh>

Inheritance diagram for gem5::BaseCache::CacheRequestPort:
gem5::QueuedRequestPort gem5::RequestPort gem5::Port gem5::AtomicRequestProtocol gem5::TimingRequestProtocol gem5::FunctionalRequestProtocol gem5::BaseCache::MemSidePort

Public Member Functions

void schedSendEvent (Tick time)
 Schedule a send of a request packet (from the MSHR).
 
- Public Member Functions inherited from gem5::QueuedRequestPort
 QueuedRequestPort (const std::string &name, ReqPacketQueue &req_queue, SnoopRespPacketQueue &snoop_resp_queue, PortID id=InvalidPortID)
 Create a QueuedPort with a given name, and a supplied implementation of two packet queues.
 
virtual ~QueuedRequestPort ()
 
void schedTimingReq (PacketPtr pkt, Tick when)
 Schedule the sending of a timing request.
 
void schedTimingSnoopResp (PacketPtr pkt, Tick when)
 Schedule the sending of a timing snoop response.
 
bool trySatisfyFunctional (PacketPtr pkt)
 Check the list of buffered packets against the supplied functional request.
 
- 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.
 
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.
 
virtual void sendRetryResp ()
 Send a retry to the response port that previously attempted a sendTimingResp to this request port and failed.
 
- Public Member Functions inherited from gem5::Port
virtual ~Port ()
 Virtual destructor due to inheritance.
 
PortgetPeer ()
 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

 CacheRequestPort (const std::string &_name, ReqPacketQueue &_reqQueue, SnoopRespPacketQueue &_snoopRespQueue)
 
virtual bool isSnooping () const
 Memory-side port always snoops.
 
- Protected Member Functions inherited from gem5::QueuedRequestPort
void recvReqRetry ()
 Called by the peer if sendTimingReq was called on this peer (causing recvTimingReq to be called on the peer) and was unsuccessful.
 
void recvRetrySnoopResp ()
 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::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.
 
virtual bool recvTimingResp (PacketPtr pkt)=0
 Receive a timing response from the peer.
 
- 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.
 

Additional Inherited Members

- Protected Attributes inherited from gem5::QueuedRequestPort
ReqPacketQueuereqQueue
 Packet queue used to store outgoing requests.
 
SnoopRespPacketQueuesnoopRespQueue
 Packet queue used to store outgoing snoop responses.
 
- Protected Attributes inherited from gem5::RequestPort
SimObjectowner
 
- 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

A cache request port is used for the memory-side port of the cache, and in addition to the basic timing port that only sends response packets through a transmit list, it also offers the ability to schedule and send request packets (requests & writebacks).

The send event is scheduled through schedSendEvent, and the sendDeferredPacket of the timing port is modified to consider both the transmit list and the requests from the MSHR.

Definition at line 134 of file base.hh.

Constructor & Destructor Documentation

◆ CacheRequestPort()

gem5::BaseCache::CacheRequestPort::CacheRequestPort ( const std::string & _name,
ReqPacketQueue & _reqQueue,
SnoopRespPacketQueue & _snoopRespQueue )
inlineprotected

Definition at line 151 of file base.hh.

Member Function Documentation

◆ isSnooping()

virtual bool gem5::BaseCache::CacheRequestPort::isSnooping ( ) const
inlineprotectedvirtual

Memory-side port always snoops.

Returns
always true

Reimplemented from gem5::RequestPort.

Definition at line 162 of file base.hh.

◆ schedSendEvent()

void gem5::BaseCache::CacheRequestPort::schedSendEvent ( Tick time)
inline

Schedule a send of a request packet (from the MSHR).

Note that we could already have a retry outstanding.

Definition at line 143 of file base.hh.

References DPRINTF, gem5::QueuedRequestPort::reqQueue, and gem5::PacketQueue::schedSendEvent().

Referenced by gem5::BaseCache::schedMemSideSendEvent().


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

Generated on Tue Jun 18 2024 16:24:09 for gem5 by doxygen 1.11.0