src/cpu/testers/rubytest/Check.cc - amd/gem5 - Git at Google

 /*
  * Copyright (c) 1999-2008 Mark D. Hill and David A. Wood
  * Copyright (c) 2009 Advanced Micro Devices, Inc.
  * 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.
  */

 #include "cpu/testers/rubytest/Check.hh"

 #include "base/random.hh"
 #include "base/trace.hh"
 #include "debug/RubyTest.hh"
 #include "mem/ruby/common/SubBlock.hh"

 typedef RubyTester::SenderState SenderState;

 Check::Check(Addr address, Addr pc, int _num_writers, int _num_readers,
              RubyTester* _tester)
     : m_num_writers(_num_writers), m_num_readers(_num_readers),
       m_tester_ptr(_tester)
 {
     m_status = TesterStatus_Idle;

     pickValue();
     pickInitiatingNode();
     changeAddress(address);
     m_pc = pc;
     m_access_mode = RubyAccessMode(random_mt.random(0,
                                                     RubyAccessMode_NUM - 1));
     m_store_count = 0;
 }

 void
 Check::initiate()
 {
     DPRINTF(RubyTest, "initiating\n");
     debugPrint();

     // currently no protocols support prefetches
     if (false && (random_mt.random(0, 0xf) == 0)) {
         initiatePrefetch(); // Prefetch from random processor
     }

         if (m_tester_ptr->getCheckFlush() && (random_mt.random(0, 0xff) == 0)) {
         initiateFlush(); // issue a Flush request from random processor
     }

     if (m_status == TesterStatus_Idle) {
         initiateAction();
     } else if (m_status == TesterStatus_Ready) {
         initiateCheck();
     } else {
         // Pending - do nothing
         DPRINTF(RubyTest,
                 "initiating action/check - failed: action/check is pending\n");
     }
 }

 void
 Check::initiatePrefetch()
 {
     DPRINTF(RubyTest, "initiating prefetch\n");

     int index = random_mt.random(0, m_num_readers - 1);
     MasterPort* port = m_tester_ptr->getReadableCpuPort(index);

     Request::Flags flags;
     flags.set(Request::PREFETCH);

     Packet::Command cmd;

     // 1 in 8 chance this will be an exclusive prefetch
     if (random_mt.random(0, 0x7) != 0) {
         cmd = MemCmd::ReadReq;

         // if necessary, make the request an instruction fetch
         if (m_tester_ptr->isInstOnlyCpuPort(index) ||
             (m_tester_ptr->isInstDataCpuPort(index) &&
              (random_mt.random(0, 0x1)))) {
             flags.set(Request::INST_FETCH);
         }
     } else {
         cmd = MemCmd::WriteReq;
         flags.set(Request::PF_EXCLUSIVE);
     }

     // Prefetches are assumed to be 0 sized
     RequestPtr req = std::make_shared<Request>(m_address, 0, flags,
             m_tester_ptr->masterId(), curTick(), m_pc);
     req->setContext(index);

     PacketPtr pkt = new Packet(req, cmd);
     // despite the oddity of the 0 size (questionable if this should
     // even be allowed), a prefetch is still a read and as such needs
     // a place to store the result
     uint8_t *data = new uint8_t[1];
     pkt->dataDynamic(data);

     // push the subblock onto the sender state.  The sequencer will
     // update the subblock on the return
     pkt->senderState = new SenderState(m_address, req->getSize());

     if (port->sendTimingReq(pkt)) {
         DPRINTF(RubyTest, "successfully initiated prefetch.\n");
     } else {
         // If the packet did not issue, must delete
         delete pkt->senderState;
         delete pkt;

         DPRINTF(RubyTest,
                 "prefetch initiation failed because Port was busy.\n");
     }
 }

 void
 Check::initiateFlush()
 {

     DPRINTF(RubyTest, "initiating Flush\n");

     int index = random_mt.random(0, m_num_writers - 1);
     MasterPort* port = m_tester_ptr->getWritableCpuPort(index);

     Request::Flags flags;

     RequestPtr req = std::make_shared<Request>(m_address, CHECK_SIZE, flags,
             m_tester_ptr->masterId(), curTick(), m_pc);

     Packet::Command cmd;

     cmd = MemCmd::FlushReq;

     PacketPtr pkt = new Packet(req, cmd);

     // push the subblock onto the sender state.  The sequencer will
     // update the subblock on the return
     pkt->senderState = new SenderState(m_address, req->getSize());

     if (port->sendTimingReq(pkt)) {
         DPRINTF(RubyTest, "initiating Flush - successful\n");
     }
 }

 void
 Check::initiateAction()
 {
     DPRINTF(RubyTest, "initiating Action\n");
     assert(m_status == TesterStatus_Idle);

     int index = random_mt.random(0, m_num_writers - 1);
     MasterPort* port = m_tester_ptr->getWritableCpuPort(index);

     Request::Flags flags;

     // Create the particular address for the next byte to be written
     Addr writeAddr(m_address + m_store_count);

     // Stores are assumed to be 1 byte-sized
     RequestPtr req = std::make_shared<Request>(
         writeAddr, 1, flags, m_tester_ptr->masterId(), curTick(), m_pc);

     req->setContext(index);
     Packet::Command cmd;

     // 1 out of 8 chance, issue an atomic rather than a write
     // if ((random() & 0x7) == 0) {
     //     cmd = MemCmd::SwapReq;
     // } else {
     cmd = MemCmd::WriteReq;
     // }

     PacketPtr pkt = new Packet(req, cmd);
     uint8_t *writeData = new uint8_t[1];
     *writeData = m_value + m_store_count;
     pkt->dataDynamic(writeData);

     DPRINTF(RubyTest, "Seq write: index %d data 0x%x check 0x%x\n", index,
             *(pkt->getConstPtr<uint8_t>()), *writeData);

     // push the subblock onto the sender state.  The sequencer will
     // update the subblock on the return
     pkt->senderState = new SenderState(writeAddr, req->getSize());

     if (port->sendTimingReq(pkt)) {
         DPRINTF(RubyTest, "initiating action - successful\n");
         DPRINTF(RubyTest, "status before action update: %s\n",
                 (TesterStatus_to_string(m_status)).c_str());
         m_status = TesterStatus_Action_Pending;
         DPRINTF(RubyTest, "Check %#x, State=Action_Pending\n", m_address);
     } else {
         // If the packet did not issue, must delete
         // Note: No need to delete the data, the packet destructor
         // will delete it
         delete pkt->senderState;
         delete pkt;

         DPRINTF(RubyTest, "failed to initiate action - sequencer not ready\n");
     }

     DPRINTF(RubyTest, "status after action update: %s\n",
             (TesterStatus_to_string(m_status)).c_str());
 }

 void
 Check::initiateCheck()
 {
     DPRINTF(RubyTest, "Initiating Check\n");
     assert(m_status == TesterStatus_Ready);

     int index = random_mt.random(0, m_num_readers - 1);
     MasterPort* port = m_tester_ptr->getReadableCpuPort(index);

     Request::Flags flags;

     // If necessary, make the request an instruction fetch
     if (m_tester_ptr->isInstOnlyCpuPort(index) ||
         (m_tester_ptr->isInstDataCpuPort(index) &&
          (random_mt.random(0, 0x1)))) {
         flags.set(Request::INST_FETCH);
     }

     // Checks are sized depending on the number of bytes written
     RequestPtr req = std::make_shared<Request>(m_address, CHECK_SIZE, flags,
                                m_tester_ptr->masterId(), curTick(), m_pc);

     req->setContext(index);
     PacketPtr pkt = new Packet(req, MemCmd::ReadReq);
     uint8_t *dataArray = new uint8_t[CHECK_SIZE];
     pkt->dataDynamic(dataArray);

     DPRINTF(RubyTest, "Seq read: index %d\n", index);

     // push the subblock onto the sender state.  The sequencer will
     // update the subblock on the return
     pkt->senderState = new SenderState(m_address, req->getSize());

     if (port->sendTimingReq(pkt)) {
         DPRINTF(RubyTest, "initiating check - successful\n");
         DPRINTF(RubyTest, "status before check update: %s\n",
                 TesterStatus_to_string(m_status).c_str());
         m_status = TesterStatus_Check_Pending;
         DPRINTF(RubyTest, "Check %#x, State=Check_Pending\n", m_address);
     } else {
         // If the packet did not issue, must delete
         // Note: No need to delete the data, the packet destructor
         // will delete it
         delete pkt->senderState;
         delete pkt;

         DPRINTF(RubyTest, "failed to initiate check - cpu port not ready\n");
     }

     DPRINTF(RubyTest, "status after check update: %s\n",
             TesterStatus_to_string(m_status).c_str());
 }

 void
 Check::performCallback(NodeID proc, SubBlock* data, Cycles curTime)
 {
     Addr address = data->getAddress();

     // This isn't exactly right since we now have multi-byte checks
     //  assert(getAddress() == address);

     assert(makeLineAddress(m_address) == makeLineAddress(address));
     assert(data != NULL);

     DPRINTF(RubyTest, "RubyTester Callback\n");
     debugPrint();

     if (m_status == TesterStatus_Action_Pending) {
         DPRINTF(RubyTest, "Action callback write value: %d, currently %d\n",
                 (m_value + m_store_count), data->getByte(0));
         // Perform store one byte at a time
         data->setByte(0, (m_value + m_store_count));
         m_store_count++;
         if (m_store_count == CHECK_SIZE) {
             m_status = TesterStatus_Ready;
             DPRINTF(RubyTest, "Check %#x, State=Ready\n", m_address);
         } else {
             m_status = TesterStatus_Idle;
             DPRINTF(RubyTest, "Check %#x, State=Idle store_count: %d\n",
                     m_address, m_store_count);
         }
         DPRINTF(RubyTest, "Action callback return data now %d\n",
                 data->getByte(0));
     } else if (m_status == TesterStatus_Check_Pending) {
         DPRINTF(RubyTest, "Check callback\n");
         // Perform load/check
         for (int byte_number=0; byte_number<CHECK_SIZE; byte_number++) {
             if (uint8_t(m_value + byte_number) != data->getByte(byte_number)) {
                 panic("Action/check failure: proc: %d address: %#x data: %s "
                       "byte_number: %d m_value+byte_number: %d byte: %d %s"
                       "Time: %d\n",
                       proc, address, data, byte_number,
                       (int)m_value + byte_number,
                       (int)data->getByte(byte_number), *this, curTime);
             }
         }
         DPRINTF(RubyTest, "Action/check success\n");
         debugPrint();

         // successful check complete, increment complete
         m_tester_ptr->incrementCheckCompletions();

         m_status = TesterStatus_Idle;
         DPRINTF(RubyTest, "Check %#x, State=Idle\n", m_address);
         pickValue();

     } else {
         panic("Unexpected TesterStatus: %s proc: %d data: %s m_status: %s "
               "time: %d\n", *this, proc, data, m_status, curTime);
     }

     DPRINTF(RubyTest, "proc: %d, Address: 0x%x\n", proc,
             makeLineAddress(m_address));
     DPRINTF(RubyTest, "Callback done\n");
     debugPrint();
 }

 void
 Check::changeAddress(Addr address)
 {
     assert(m_status == TesterStatus_Idle || m_status == TesterStatus_Ready);
     m_status = TesterStatus_Idle;
     m_address = address;
     DPRINTF(RubyTest, "Check %#x, State=Idle\n", m_address);
     m_store_count = 0;
 }

 void
 Check::pickValue()
 {
     assert(m_status == TesterStatus_Idle);
     m_value = random_mt.random(0, 0xff); // One byte
     m_store_count = 0;
 }

 void
 Check::pickInitiatingNode()
 {
     assert(m_status == TesterStatus_Idle || m_status == TesterStatus_Ready);
     m_status = TesterStatus_Idle;
     m_initiatingNode = (random_mt.random(0, m_num_writers - 1));
     DPRINTF(RubyTest, "Check %#x, State=Idle, picked initiating node %d\n",
             m_address, m_initiatingNode);
     m_store_count = 0;
 }

 void
 Check::print(std::ostream& out) const
 {
     out << "["
         << m_address << ", value: "
         << (int)m_value << ", status: "
         << m_status << ", initiating node: "
         << m_initiatingNode << ", store_count: "
         << m_store_count
         << "]" << std::flush;
 }

 void
 Check::debugPrint()
 {
     DPRINTF(RubyTest,
         "[%#x, value: %d, status: %s, initiating node: %d, store_count: %d]\n",
         m_address, (int)m_value, TesterStatus_to_string(m_status).c_str(),
         m_initiatingNode, m_store_count);
 }
	/*
	* Copyright (c) 1999-2008 Mark D. Hill and David A. Wood
	* Copyright (c) 2009 Advanced Micro Devices, Inc.
	* 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.
	*/

	#include "cpu/testers/rubytest/Check.hh"

	#include "base/random.hh"
	#include "base/trace.hh"
	#include "debug/RubyTest.hh"
	#include "mem/ruby/common/SubBlock.hh"

	typedef RubyTester::SenderState SenderState;

	Check::Check(Addr address, Addr pc, int _num_writers, int _num_readers,
	RubyTester* _tester)
	: m_num_writers(_num_writers), m_num_readers(_num_readers),
	m_tester_ptr(_tester)
	{
	m_status = TesterStatus_Idle;

	pickValue();
	pickInitiatingNode();
	changeAddress(address);
	m_pc = pc;
	m_access_mode = RubyAccessMode(random_mt.random(0,
	RubyAccessMode_NUM - 1));
	m_store_count = 0;
	}

	void
	Check::initiate()
	{
	DPRINTF(RubyTest, "initiating\n");
	debugPrint();

	// currently no protocols support prefetches
	if (false && (random_mt.random(0, 0xf) == 0)) {
	initiatePrefetch(); // Prefetch from random processor
	}

	if (m_tester_ptr->getCheckFlush() && (random_mt.random(0, 0xff) == 0)) {
	initiateFlush(); // issue a Flush request from random processor
	}

	if (m_status == TesterStatus_Idle) {
	initiateAction();
	} else if (m_status == TesterStatus_Ready) {
	initiateCheck();
	} else {
	// Pending - do nothing
	DPRINTF(RubyTest,
	"initiating action/check - failed: action/check is pending\n");
	}
	}

	void
	Check::initiatePrefetch()
	{
	DPRINTF(RubyTest, "initiating prefetch\n");

	int index = random_mt.random(0, m_num_readers - 1);
	MasterPort* port = m_tester_ptr->getReadableCpuPort(index);

	Request::Flags flags;
	flags.set(Request::PREFETCH);

	Packet::Command cmd;

	// 1 in 8 chance this will be an exclusive prefetch
	if (random_mt.random(0, 0x7) != 0) {
	cmd = MemCmd::ReadReq;

	// if necessary, make the request an instruction fetch
	if (m_tester_ptr->isInstOnlyCpuPort(index) \|\|
	(m_tester_ptr->isInstDataCpuPort(index) &&
	(random_mt.random(0, 0x1)))) {
	flags.set(Request::INST_FETCH);
	}
	} else {
	cmd = MemCmd::WriteReq;
	flags.set(Request::PF_EXCLUSIVE);
	}

	// Prefetches are assumed to be 0 sized
	RequestPtr req = std::make_shared<Request>(m_address, 0, flags,
	m_tester_ptr->masterId(), curTick(), m_pc);
	req->setContext(index);

	PacketPtr pkt = new Packet(req, cmd);
	// despite the oddity of the 0 size (questionable if this should
	// even be allowed), a prefetch is still a read and as such needs
	// a place to store the result
	uint8_t *data = new uint8_t[1];
	pkt->dataDynamic(data);

	// push the subblock onto the sender state. The sequencer will
	// update the subblock on the return
	pkt->senderState = new SenderState(m_address, req->getSize());

	if (port->sendTimingReq(pkt)) {
	DPRINTF(RubyTest, "successfully initiated prefetch.\n");
	} else {
	// If the packet did not issue, must delete
	delete pkt->senderState;
	delete pkt;

	DPRINTF(RubyTest,
	"prefetch initiation failed because Port was busy.\n");
	}
	}

	void
	Check::initiateFlush()
	{

	DPRINTF(RubyTest, "initiating Flush\n");

	int index = random_mt.random(0, m_num_writers - 1);
	MasterPort* port = m_tester_ptr->getWritableCpuPort(index);

	Request::Flags flags;

	RequestPtr req = std::make_shared<Request>(m_address, CHECK_SIZE, flags,
	m_tester_ptr->masterId(), curTick(), m_pc);

	Packet::Command cmd;

	cmd = MemCmd::FlushReq;

	PacketPtr pkt = new Packet(req, cmd);

	// push the subblock onto the sender state. The sequencer will
	// update the subblock on the return
	pkt->senderState = new SenderState(m_address, req->getSize());

	if (port->sendTimingReq(pkt)) {
	DPRINTF(RubyTest, "initiating Flush - successful\n");
	}
	}

	void
	Check::initiateAction()
	{
	DPRINTF(RubyTest, "initiating Action\n");
	assert(m_status == TesterStatus_Idle);

	int index = random_mt.random(0, m_num_writers - 1);
	MasterPort* port = m_tester_ptr->getWritableCpuPort(index);

	Request::Flags flags;

	// Create the particular address for the next byte to be written
	Addr writeAddr(m_address + m_store_count);

	// Stores are assumed to be 1 byte-sized
	RequestPtr req = std::make_shared<Request>(
	writeAddr, 1, flags, m_tester_ptr->masterId(), curTick(), m_pc);

	req->setContext(index);
	Packet::Command cmd;

	// 1 out of 8 chance, issue an atomic rather than a write
	// if ((random() & 0x7) == 0) {
	// cmd = MemCmd::SwapReq;
	// } else {
	cmd = MemCmd::WriteReq;
	// }

	PacketPtr pkt = new Packet(req, cmd);
	uint8_t *writeData = new uint8_t[1];
	*writeData = m_value + m_store_count;
	pkt->dataDynamic(writeData);

	DPRINTF(RubyTest, "Seq write: index %d data 0x%x check 0x%x\n", index,
	(pkt->getConstPtr<uint8_t>()), writeData);

	// push the subblock onto the sender state. The sequencer will
	// update the subblock on the return
	pkt->senderState = new SenderState(writeAddr, req->getSize());

	if (port->sendTimingReq(pkt)) {
	DPRINTF(RubyTest, "initiating action - successful\n");
	DPRINTF(RubyTest, "status before action update: %s\n",
	(TesterStatus_to_string(m_status)).c_str());
	m_status = TesterStatus_Action_Pending;
	DPRINTF(RubyTest, "Check %#x, State=Action_Pending\n", m_address);
	} else {
	// If the packet did not issue, must delete
	// Note: No need to delete the data, the packet destructor
	// will delete it
	delete pkt->senderState;
	delete pkt;

	DPRINTF(RubyTest, "failed to initiate action - sequencer not ready\n");
	}

	DPRINTF(RubyTest, "status after action update: %s\n",
	(TesterStatus_to_string(m_status)).c_str());
	}

	void
	Check::initiateCheck()
	{
	DPRINTF(RubyTest, "Initiating Check\n");
	assert(m_status == TesterStatus_Ready);

	int index = random_mt.random(0, m_num_readers - 1);
	MasterPort* port = m_tester_ptr->getReadableCpuPort(index);

	Request::Flags flags;

	// If necessary, make the request an instruction fetch
	if (m_tester_ptr->isInstOnlyCpuPort(index) \|\|
	(m_tester_ptr->isInstDataCpuPort(index) &&
	(random_mt.random(0, 0x1)))) {
	flags.set(Request::INST_FETCH);
	}

	// Checks are sized depending on the number of bytes written
	RequestPtr req = std::make_shared<Request>(m_address, CHECK_SIZE, flags,
	m_tester_ptr->masterId(), curTick(), m_pc);

	req->setContext(index);
	PacketPtr pkt = new Packet(req, MemCmd::ReadReq);
	uint8_t *dataArray = new uint8_t[CHECK_SIZE];
	pkt->dataDynamic(dataArray);

	DPRINTF(RubyTest, "Seq read: index %d\n", index);

	// push the subblock onto the sender state. The sequencer will
	// update the subblock on the return
	pkt->senderState = new SenderState(m_address, req->getSize());

	if (port->sendTimingReq(pkt)) {
	DPRINTF(RubyTest, "initiating check - successful\n");
	DPRINTF(RubyTest, "status before check update: %s\n",
	TesterStatus_to_string(m_status).c_str());
	m_status = TesterStatus_Check_Pending;
	DPRINTF(RubyTest, "Check %#x, State=Check_Pending\n", m_address);
	} else {
	// If the packet did not issue, must delete
	// Note: No need to delete the data, the packet destructor
	// will delete it
	delete pkt->senderState;
	delete pkt;

	DPRINTF(RubyTest, "failed to initiate check - cpu port not ready\n");
	}

	DPRINTF(RubyTest, "status after check update: %s\n",
	TesterStatus_to_string(m_status).c_str());
	}

	void
	Check::performCallback(NodeID proc, SubBlock* data, Cycles curTime)
	{
	Addr address = data->getAddress();

	// This isn't exactly right since we now have multi-byte checks
	// assert(getAddress() == address);

	assert(makeLineAddress(m_address) == makeLineAddress(address));
	assert(data != NULL);

	DPRINTF(RubyTest, "RubyTester Callback\n");
	debugPrint();

	if (m_status == TesterStatus_Action_Pending) {
	DPRINTF(RubyTest, "Action callback write value: %d, currently %d\n",
	(m_value + m_store_count), data->getByte(0));
	// Perform store one byte at a time
	data->setByte(0, (m_value + m_store_count));
	m_store_count++;
	if (m_store_count == CHECK_SIZE) {
	m_status = TesterStatus_Ready;
	DPRINTF(RubyTest, "Check %#x, State=Ready\n", m_address);
	} else {
	m_status = TesterStatus_Idle;
	DPRINTF(RubyTest, "Check %#x, State=Idle store_count: %d\n",
	m_address, m_store_count);
	}
	DPRINTF(RubyTest, "Action callback return data now %d\n",
	data->getByte(0));
	} else if (m_status == TesterStatus_Check_Pending) {
	DPRINTF(RubyTest, "Check callback\n");
	// Perform load/check
	for (int byte_number=0; byte_number<CHECK_SIZE; byte_number++) {
	if (uint8_t(m_value + byte_number) != data->getByte(byte_number)) {
	panic("Action/check failure: proc: %d address: %#x data: %s "
	"byte_number: %d m_value+byte_number: %d byte: %d %s"
	"Time: %d\n",
	proc, address, data, byte_number,
	(int)m_value + byte_number,
	(int)data->getByte(byte_number), *this, curTime);
	}
	}
	DPRINTF(RubyTest, "Action/check success\n");
	debugPrint();

	// successful check complete, increment complete
	m_tester_ptr->incrementCheckCompletions();

	m_status = TesterStatus_Idle;
	DPRINTF(RubyTest, "Check %#x, State=Idle\n", m_address);
	pickValue();

	} else {
	panic("Unexpected TesterStatus: %s proc: %d data: %s m_status: %s "
	"time: %d\n", *this, proc, data, m_status, curTime);
	}

	DPRINTF(RubyTest, "proc: %d, Address: 0x%x\n", proc,
	makeLineAddress(m_address));
	DPRINTF(RubyTest, "Callback done\n");
	debugPrint();
	}

	void
	Check::changeAddress(Addr address)
	{
	assert(m_status == TesterStatus_Idle \|\| m_status == TesterStatus_Ready);
	m_status = TesterStatus_Idle;
	m_address = address;
	DPRINTF(RubyTest, "Check %#x, State=Idle\n", m_address);
	m_store_count = 0;
	}

	void
	Check::pickValue()
	{
	assert(m_status == TesterStatus_Idle);
	m_value = random_mt.random(0, 0xff); // One byte
	m_store_count = 0;
	}

	void
	Check::pickInitiatingNode()
	{
	assert(m_status == TesterStatus_Idle \|\| m_status == TesterStatus_Ready);
	m_status = TesterStatus_Idle;
	m_initiatingNode = (random_mt.random(0, m_num_writers - 1));
	DPRINTF(RubyTest, "Check %#x, State=Idle, picked initiating node %d\n",
	m_address, m_initiatingNode);
	m_store_count = 0;
	}

	void
	Check::print(std::ostream& out) const
	{
	out << "["
	<< m_address << ", value: "
	<< (int)m_value << ", status: "
	<< m_status << ", initiating node: "
	<< m_initiatingNode << ", store_count: "
	<< m_store_count
	<< "]" << std::flush;
	}

	void
	Check::debugPrint()
	{
	DPRINTF(RubyTest,
	"[%#x, value: %d, status: %s, initiating node: %d, store_count: %d]\n",
	m_address, (int)m_value, TesterStatus_to_string(m_status).c_str(),
	m_initiatingNode, m_store_count);
	}