gem5  v20.1.0.0
Public Member Functions | Protected Member Functions | Protected Attributes | List of all members
QueuedRequestPort Class Reference

The QueuedRequestPort combines two queues, a request queue and a snoop response queue, that both share the same port. More...

#include <qport.hh>

Inheritance diagram for QueuedRequestPort:
RequestPort Port AtomicRequestProtocol TimingRequestProtocol FunctionalRequestProtocol BaseCache::CacheRequestPort X86ISA::IntRequestPort< X86ISA::I82094AA > X86ISA::IntRequestPort< X86ISA::Interrupts > MemDelay::RequestPort RubyPort::MemRequestPort RubyPort::PioRequestPort SMMUATSMemoryPort X86ISA::IntRequestPort< Device >

Public Member Functions

 QueuedRequestPort (const std::string &name, SimObject *owner, ReqPacketQueue &req_queue, SnoopRespPacketQueue &snoop_resp_queue, PortID id=InvalidPortID)
 Create a QueuedPort with a given name, owner, and a supplied implementation of two packet queues. More...
 
virtual ~QueuedRequestPort ()
 
void schedTimingReq (PacketPtr pkt, Tick when)
 Schedule the sending of a timing request. More...
 
void schedTimingSnoopResp (PacketPtr pkt, Tick when)
 Schedule the sending of a timing snoop response. More...
 
bool trySatisfyFunctional (PacketPtr pkt)
 Check the list of buffered packets against the supplied functional request. More...
 
- Public Member Functions inherited from RequestPort
 RequestPort (const std::string &name, SimObject *_owner, PortID id=InvalidPortID)
 Request port. More...
 
virtual ~RequestPort ()
 
void bind (Port &peer) override
 Bind this request port to a response port. More...
 
void unbind () override
 Unbind this request port and the associated response port. More...
 
virtual bool isSnooping () const
 Determine if this request port is snooping or not. More...
 
AddrRangeList getAddrRanges () const
 Get the address ranges of the connected responder port. More...
 
void printAddr (Addr a)
 Inject a PrintReq for the given address to print the state of that address throughout the memory system. More...
 
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. More...
 
Tick sendAtomicBackdoor (PacketPtr pkt, MemBackdoorPtr &backdoor)
 Send an atomic request packet like above, but also request a backdoor to the data being accessed. More...
 
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. More...
 
bool sendTimingReq (PacketPtr pkt)
 Attempt to send a timing request to the responder port by calling its corresponding receive function. More...
 
bool tryTiming (PacketPtr pkt) const
 Check if the responder can handle a timing request. More...
 
bool sendTimingSnoopResp (PacketPtr pkt)
 Attempt to send a timing snoop response packet to the response port by calling its corresponding receive function. More...
 
virtual void sendRetryResp ()
 Send a retry to the response port that previously attempted a sendTimingResp to this request port and failed. More...
 
- Public Member Functions inherited from Port
virtual ~Port ()
 Virtual destructor due to inheritance. More...
 
PortgetPeer ()
 Return a reference to this port's peer. More...
 
const std::string name () const
 Return port name (for DPRINTF). More...
 
PortID getId () const
 Get the port id. More...
 
bool isConnected () const
 Is this port currently connected to a peer? More...
 
void takeOverFrom (Port *old)
 A utility function to make it easier to swap out ports. More...
 

Protected Member Functions

void recvReqRetry ()
 Called by the peer if sendTimingReq was called on this peer (causing recvTimingReq to be called on the peer) and was unsuccessful. More...
 
void recvRetrySnoopResp ()
 Called by the peer if sendTimingSnoopResp was called on this protocol (causing recvTimingSnoopResp to be called on the peer) and was unsuccessful. More...
 
- Protected Member Functions inherited from RequestPort
virtual void recvRangeChange ()
 Called to receive an address range change from the peer response port. More...
 
Tick recvAtomicSnoop (PacketPtr pkt) override
 Default implementations. More...
 
void recvFunctionalSnoop (PacketPtr pkt) override
 Receive a functional snoop request packet from the peer. More...
 
void recvTimingSnoopReq (PacketPtr pkt) override
 Receive a timing snoop request from the peer. More...
 
- Protected Member Functions inherited from Port
void reportUnbound () const
 
 Port (const std::string &_name, PortID _id)
 Abstract base class for ports. More...
 
- Protected Member Functions inherited from 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. More...
 
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. More...
 
- Protected Member Functions inherited from TimingRequestProtocol
bool sendReq (TimingResponseProtocol *peer, PacketPtr pkt)
 Attempt to send a timing request to the peer by calling its corresponding receive function. More...
 
bool trySend (TimingResponseProtocol *peer, PacketPtr pkt) const
 Check if the peer can handle a timing request. More...
 
bool sendSnoopResp (TimingResponseProtocol *peer, PacketPtr pkt)
 Attempt to send a timing snoop response packet to it's peer by calling its corresponding receive function. More...
 
void sendRetryResp (TimingResponseProtocol *peer)
 Send a retry to the peer that previously attempted a sendTimingResp to this protocol and failed. More...
 
virtual bool recvTimingResp (PacketPtr pkt)=0
 Receive a timing response from the peer. More...
 
- Protected Member Functions inherited from 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. More...
 

Protected Attributes

ReqPacketQueuereqQueue
 Packet queue used to store outgoing requests. More...
 
SnoopRespPacketQueuesnoopRespQueue
 Packet queue used to store outgoing snoop responses. More...
 
- Protected Attributes inherited from RequestPort
SimObjectowner
 
- Protected Attributes inherited from 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. More...
 
Port_peer
 A pointer to this port's peer. More...
 
bool _connected
 Whether this port is currently connected to a peer port. More...
 

Detailed Description

The QueuedRequestPort combines two queues, a request queue and a snoop response queue, that both share the same port.

The flow control for requests and snoop responses are completely independent, and so each queue manages its own flow control (retries).

Definition at line 106 of file qport.hh.

Constructor & Destructor Documentation

◆ QueuedRequestPort()

QueuedRequestPort::QueuedRequestPort ( const std::string &  name,
SimObject owner,
ReqPacketQueue req_queue,
SnoopRespPacketQueue snoop_resp_queue,
PortID  id = InvalidPortID 
)
inline

Create a QueuedPort with a given name, owner, and a supplied implementation of two packet queues.

The external definition of the queues enables e.g. the cache to implement a specific queue behaviuor in a subclass, and provide the latter to the QueuePort constructor.

Definition at line 130 of file qport.hh.

◆ ~QueuedRequestPort()

virtual QueuedRequestPort::~QueuedRequestPort ( )
inlinevirtual

Definition at line 138 of file qport.hh.

Member Function Documentation

◆ recvReqRetry()

void QueuedRequestPort::recvReqRetry ( )
inlineprotectedvirtual

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

Implements TimingRequestProtocol.

Definition at line 117 of file qport.hh.

References reqQueue, and PacketQueue::retry().

◆ recvRetrySnoopResp()

void QueuedRequestPort::recvRetrySnoopResp ( )
inlineprotectedvirtual

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

Reimplemented from RequestPort.

Definition at line 119 of file qport.hh.

References PacketQueue::retry(), and snoopRespQueue.

◆ schedTimingReq()

void QueuedRequestPort::schedTimingReq ( PacketPtr  pkt,
Tick  when 
)
inline

Schedule the sending of a timing request.

Parameters
pktPacket to send
whenAbsolute time (in ticks) to send packet

Definition at line 146 of file qport.hh.

References reqQueue, and PacketQueue::schedSendTiming().

Referenced by RubyPort::MemResponsePort::recvTimingReq(), and X86ISA::IntRequestPort< X86ISA::I82094AA >::sendMessage().

◆ schedTimingSnoopResp()

void QueuedRequestPort::schedTimingSnoopResp ( PacketPtr  pkt,
Tick  when 
)
inline

Schedule the sending of a timing snoop response.

Parameters
pktPacket to send
whenAbsolute time (in ticks) to send packet

Definition at line 155 of file qport.hh.

References PacketQueue::schedSendTiming(), and snoopRespQueue.

Referenced by Cache::doTimingSupplyResponse(), and Cache::recvTimingSnoopResp().

◆ trySatisfyFunctional()

bool QueuedRequestPort::trySatisfyFunctional ( PacketPtr  pkt)
inline

Check the list of buffered packets against the supplied functional request.

Definition at line 160 of file qport.hh.

References reqQueue, snoopRespQueue, and PacketQueue::trySatisfyFunctional().

Referenced by BaseCache::functionalAccess(), and MemDelay::trySatisfyFunctional().

Member Data Documentation

◆ reqQueue

ReqPacketQueue& QueuedRequestPort::reqQueue
protected

Packet queue used to store outgoing requests.

Definition at line 112 of file qport.hh.

Referenced by recvReqRetry(), BaseCache::CacheRequestPort::schedSendEvent(), schedTimingReq(), and trySatisfyFunctional().

◆ snoopRespQueue

SnoopRespPacketQueue& QueuedRequestPort::snoopRespQueue
protected

Packet queue used to store outgoing snoop responses.

Definition at line 115 of file qport.hh.

Referenced by recvRetrySnoopResp(), schedTimingSnoopResp(), and trySatisfyFunctional().


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

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