RubyPort.hh

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/*
 * Copyright (c) 2012-2013,2019,2021 ARM Limited
 * All rights reserved.
 *
 * The license below extends only to copyright in the software and shall
 * not be construed as granting a license to any other intellectual
 * property including but not limited to intellectual property relating
 * to a hardware implementation of the functionality of the software
 * licensed hereunder.  You may use the software subject to the license
 * terms below provided that you ensure that this notice is replicated
 * unmodified and in its entirety in all distributions of the software,
 * modified or unmodified, in source code or in binary form.
 *
 * Copyright (c) 2009-2013 Advanced Micro Devices, Inc.
 * Copyright (c) 2011 Mark D. Hill and David A. Wood
 * All rights reserved.
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 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met: redistributions of source code must retain the above copyright
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#ifndef __MEM_RUBY_SYSTEM_RUBYPORT_HH__
#define __MEM_RUBY_SYSTEM_RUBYPORT_HH__
 
#include <cassert>
#include <string>
 
#include "mem/ruby/common/MachineID.hh"
#include "mem/ruby/network/MessageBuffer.hh"
#include "mem/ruby/protocol/RequestStatus.hh"
#include "mem/ruby/system/RubySystem.hh"
#include "mem/tport.hh"
#include "params/RubyPort.hh"
#include "sim/clocked_object.hh"
 
namespace gem5
{
 
namespace ruby
{
 
class AbstractController;
 
class RubyPort : public ClockedObject
{
  public:
    class MemRequestPort : public QueuedRequestPort
    {
      private:
        RubyPort& owner;
        ReqPacketQueue reqQueue;
        SnoopRespPacketQueue snoopRespQueue;
 
      public:
        MemRequestPort(const std::string &_name, RubyPort& _port);
 
      protected:
        bool recvTimingResp(PacketPtr pkt);
        void recvRangeChange() {}
    };
 
    class MemResponsePort : public QueuedResponsePort
    {
      private:
        RubyPort& owner;
        RespPacketQueue queue;
        bool access_backing_store;
        bool no_retry_on_stall;
 
      public:
        MemResponsePort(const std::string &_name,
                        RubyPort& _port,
                        bool _access_backing_store,
                        PortID id, bool _no_retry_on_stall);
        void hitCallback(PacketPtr pkt);
        void evictionCallback(Addr address);
 
      protected:
        bool recvTimingReq(PacketPtr pkt);
 
        Tick recvAtomic(PacketPtr pkt);
 
        void recvFunctional(PacketPtr pkt);
 
        AddrRangeList getAddrRanges() const
        { AddrRangeList ranges; return ranges; }
 
        void addToRetryList();
 
      private:
        bool isShadowRomAddress(Addr addr) const;
        bool isPhysMemAddress(PacketPtr pkt) const;
    };
 
    class PioRequestPort : public QueuedRequestPort
    {
      private:
        RubyPort& owner;
        ReqPacketQueue reqQueue;
        SnoopRespPacketQueue snoopRespQueue;
 
      public:
        PioRequestPort(const std::string &_name, RubyPort& _port);
 
      protected:
        bool recvTimingResp(PacketPtr pkt);
        void recvRangeChange();
    };
 
    class PioResponsePort : public QueuedResponsePort
    {
      private:
        RubyPort& owner;
        RespPacketQueue queue;
 
      public:
        PioResponsePort(const std::string &_name, RubyPort& _port);
 
      protected:
        bool recvTimingReq(PacketPtr pkt);
 
        Tick recvAtomic(PacketPtr pkt);
 
        void recvFunctional(PacketPtr pkt)
        { panic("recvFunctional should never be called on pio response "
                "port!"); }
 
        AddrRangeList getAddrRanges() const;
    };
 
    struct SenderState : public Packet::SenderState
    {
        MemResponsePort *port;
        SenderState(MemResponsePort * _port) : port(_port)
        {}
     };
 
    typedef RubyPortParams Params;
    RubyPort(const Params &p);
    virtual ~RubyPort() {}
 
    void init() override;
 
    Port &getPort(const std::string &if_name,
                  PortID idx=InvalidPortID) override;
 
    virtual RequestStatus makeRequest(PacketPtr pkt) = 0;
    virtual int outstandingCount() const = 0;
    virtual bool isDeadlockEventScheduled() const = 0;
    virtual void descheduleDeadlockEvent() = 0;
 
    //
    // Called by the controller to give the sequencer a pointer.
    // A pointer to the controller is needed for atomic support.
    //
    void setController(AbstractController* _cntrl) { m_controller = _cntrl; }
    uint32_t getId() { return m_version; }
    DrainState drain() override;
 
    bool isCPUSequencer() { return m_isCPUSequencer; }
 
    virtual int functionalWrite(Packet *func_pkt);
 
  protected:
    void trySendRetries();
    void ruby_hit_callback(PacketPtr pkt);
    void ruby_unaddressed_callback(PacketPtr pkt);
    void ruby_stale_translation_callback(Addr txnId);
    void testDrainComplete();
    void ruby_eviction_callback(Addr address);
 
    bool recvTimingResp(PacketPtr pkt, PortID request_port_id);
 
    RubySystem *m_ruby_system;
    uint32_t m_version;
    AbstractController* m_controller;
    MessageBuffer* m_mandatory_q_ptr;
    bool m_usingRubyTester;
    System* system;
 
    std::vector<MemResponsePort *> response_ports;
 
  private:
    bool onRetryList(MemResponsePort * port)
    {
        return (std::find(retryList.begin(), retryList.end(), port) !=
                retryList.end());
    }
    void addToRetryList(MemResponsePort * port)
    {
        if (onRetryList(port)) return;
        retryList.push_back(port);
    }
 
    PioRequestPort pioRequestPort;
    PioResponsePort pioResponsePort;
    MemRequestPort memRequestPort;
    MemResponsePort memResponsePort;
    unsigned int gotAddrRanges;
 
    typedef std::vector<MemResponsePort *>::iterator CpuPortIter;
    std::vector<PioRequestPort *> request_ports;
 
    //
    // Based on similar code in the M5 bus.  Stores pointers to those ports
    // that should be called when the Sequencer becomes available after a stall.
    //
    std::vector<MemResponsePort *> retryList;
 
    bool m_isCPUSequencer;
};
 
} // namespace ruby
} // namespace gem5
 
#endif // __MEM_RUBY_SYSTEM_RUBYPORT_HH__