gem5/src/mem/protocol/MOSI_SMP_bcast-dir.sm

/*
 * Copyright (c) 1999-2005 Mark D. Hill and David A. Wood
 * All rights reserved.
 *
 * 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
 * notice, this list of conditions and the following disclaimer;
 * redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in the
 * documentation and/or other materials provided with the distribution;
 * neither the name of the copyright holders nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/*
 * $Id$
 *
 */

machine(Directory, "MOSI Broadcast Optimized") {


  MessageBuffer addressFromDir, network="To", virtual_network="0", ordered="true";
  MessageBuffer dataFromDir, network="To", virtual_network="1", ordered="false";

  MessageBuffer addressToDir, network="From", virtual_network="0", ordered="true";
  MessageBuffer dataToDir, network="From", virtual_network="1", ordered="false";


  enumeration(State, desc="Directory states", default="Directory_State_C") {
    C, desc="Cold - no processor has requested this line";
    I, desc="Idle";
    S, desc="Shared";
    SS, desc="Shared, 2 or more shares";
    OS, desc="Owned by a cache";
    OSS, desc="Owned by a cache, present in at least 3 caches";
    M, desc="Modified", format="!b";
  }

  // ** EVENTS **

  enumeration(Event, desc="Directory events") {
    // From Address network
    OtherAddress,  desc="We saw an address msg to someone else";
    GETS,          desc="A GETS arrives";
    GET_INSTR,     desc="A GETInstr arrives";
    GETX,          desc="A GETX arrives", format="!r";
    PUTX_Owner,    desc="A PUTX arrives, requestor is owner";
    PUTX_NotOwner, desc="A PUTX arrives, requestor is not owner", format="!r";
  }

  // TYPES

  // DirectoryEntry
  structure(Entry, desc="...") {
    State DirectoryState,          desc="Directory state";
    bool DirOwner, default="true", desc="Is dir owner?";
    MachineID ProcOwner, desc="Processor Owner";
    DataBlock DataBlk,             desc="data for the block";
  }

  external_type(DirectoryMemory) {
    Entry lookup(Address);
    bool isPresent(Address);
  }

  // ** OBJECTS **

  DirectoryMemory directory, constructor_hack="i";

  void profile_request(int cache_state, State directory_state, GenericRequestType request_type);

  State getState(Address addr) {
    if (directory.isPresent(addr)) {
      return directory[addr].DirectoryState;
    }
    return State:C;
  }

  void setState(Address addr, State state) {
    if (directory.isPresent(addr)) {
      directory[addr].DirectoryState := state;
    }
  }

  // ** OUT_PORTS **

  out_port(dataNetwork_out, DataMsg, dataFromDir);
  out_port(addressNetwork_out, AddressMsg, addressFromDir);

  // ** IN_PORTS **

  // Address Network
  in_port(addressNetwork_in, AddressMsg, addressToDir) {
    if (addressNetwork_in.isReady()) {
      peek(addressNetwork_in, AddressMsg) {
        if(map_Address_to_Directory(in_msg.Address) != machineID) {
          trigger(Event:OtherAddress, in_msg.Address);
        } else if (in_msg.Type == CoherenceRequestType:GETS) {
          trigger(Event:GETS, in_msg.Address);
        } else if (in_msg.Type == CoherenceRequestType:GET_INSTR) {
          trigger(Event:GET_INSTR, in_msg.Address);
        } else if (in_msg.Type == CoherenceRequestType:GETX) {
          trigger(Event:GETX, in_msg.Address);
        } else if (in_msg.Type == CoherenceRequestType:PUTX) {
          if (in_msg.Requestor == directory[in_msg.Address].ProcOwner && directory[in_msg.Address].DirOwner == false) {
            trigger(Event:PUTX_Owner, in_msg.Address);
          } else {
            trigger(Event:PUTX_NotOwner, in_msg.Address);
          }
        } else {
          error("unexpected message");
        }
      }
    }
  }

  // *** ACTIONS ***

  action(d_sendDataMsg, "d", desc="Send data message to requestor") {
    peek(addressNetwork_in, AddressMsg) {
      enqueue(dataNetwork_out, DataMsg, latency="MEMORY_LATENCY") {
        out_msg.Address := in_msg.Address;
        out_msg.Sender := machineID;
        out_msg.Destination.add(in_msg.Requestor);
        out_msg.DestMachine := MachineType:L1Cache;
        out_msg.DataBlk := directory[in_msg.Address].DataBlk;
        out_msg.MessageSize := MessageSizeType:Data;
        DEBUG_EXPR(in_msg.Requestor);
        DEBUG_EXPR(out_msg.DataBlk);
      }
    }
  }

  action(j_popAddressQueue, "j", desc="Pop address queue.") {
    addressNetwork_in.dequeue();
  }

  action(p_profile, "p", desc="Profile this transition.") {
    peek(addressNetwork_in, AddressMsg) {
      profile_request(in_msg.CacheState, getState(address), convertToGenericType(in_msg.Type));
    }
  }

  action(m_setOwnerRequestor, "m", desc="Set owner = requestor") {
    peek(addressNetwork_in, AddressMsg) {
      directory[in_msg.Address].ProcOwner := in_msg.Requestor;
      directory[in_msg.Address].DirOwner := false;
    }
  }

  action(r_writeDataFromRequest, "r", desc="Write request data to memory") {
    peek(addressNetwork_in, AddressMsg) {
      directory[in_msg.Address].DataBlk := in_msg.DataBlk;
      DEBUG_EXPR(in_msg.Address);
      DEBUG_EXPR(in_msg.DataBlk);
    }
  }

  action(x_setOwnerToDirectory, "x", desc="Set owner equal to the directory"){
    peek(addressNetwork_in, AddressMsg) {
      directory[in_msg.Address].DirOwner := true;
    }
  }

  // TRANSITIONS

  // Ignore all address and data messages not bound for us
  transition(C, OtherAddress) {
    j_popAddressQueue;
  }

  // PUTX_NotOwner Transitions
  transition({I, S, SS, OS, OSS, M}, PUTX_NotOwner) {
    p_profile;
    j_popAddressQueue;
  }

  // Transitions from Idle
  transition({C, I}, {GETS,GET_INSTR}, S) {
    d_sendDataMsg;
    p_profile;
    j_popAddressQueue;
  }

  transition({C, I}, GETX, M) {
    d_sendDataMsg;
    m_setOwnerRequestor;
    p_profile;
    j_popAddressQueue
  }

  // Transitions from Shared
  transition({S, SS}, {GETS,GET_INSTR}, SS) {
    d_sendDataMsg;
    p_profile;
    j_popAddressQueue;
  }

  transition({S, SS}, GETX, M) {
    d_sendDataMsg;
    m_setOwnerRequestor;
    p_profile;
    j_popAddressQueue;
  }

  // Transitions from Owned
  transition({OS, OSS}, {GETS,GET_INSTR}, OSS) {
    p_profile;
    j_popAddressQueue;
  }

  transition({OS, OSS}, GETX, M) {
    m_setOwnerRequestor;
    p_profile;
    j_popAddressQueue;
  }

  transition(OS, PUTX_Owner, S) {
    x_setOwnerToDirectory;
    r_writeDataFromRequest;
    p_profile;
    j_popAddressQueue;
  }

  transition(OSS, PUTX_Owner, SS) {
    x_setOwnerToDirectory;
    r_writeDataFromRequest;
    p_profile;
    j_popAddressQueue;
  }

  // Transitions from Modified
  transition(M, {GETS,GET_INSTR}, OS) {
    p_profile;
    j_popAddressQueue;
  }

  transition(M, GETX) {
    m_setOwnerRequestor;
    p_profile;
    j_popAddressQueue;
  }

  transition(M, PUTX_Owner, I) {
    x_setOwnerToDirectory;
    r_writeDataFromRequest;
    p_profile;
    j_popAddressQueue;
  }

}