misc: Clean up and complete the gem5<->SystemC-TLM bridge [2/10]

The current TLM bridge only provides a Slave Port that allows the gem5
world to send request to the SystemC world. This patch series refractors
and cleans up the existing code, and adds a Master Port that allows the
SystemC world to send requests to the gem5 world.

This patch:
 * Add the Master Port.  Add an example application that isslustrates its
 * use.

Testing Done: A simple example application consisting of a TLM traffic
generator and a gem5 memory is part of the patch.

Reviewed at http://reviews.gem5.org/r/3528/

Signed-off-by: Jason Lowe-Power <jason@lowepower.com>
This commit is contained in:
Christian Menard 2017-02-09 19:15:33 -05:00
parent b25ea094d4
commit 55f5c4dd8a
8 changed files with 982 additions and 0 deletions

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#!python
# Copyright (c) 2016, Dresden University of Technology (TU Dresden)
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are
# met:
#
# 1. Redistributions of source code must retain the above copyright notice,
# this list of conditions and the following disclaimer.
#
# 2. 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.
#
# 3. Neither the name of the copyright holder 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 HOLDER
# 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.
#
# Authors: Christian Menard
import os
gem5_arch = 'ARM'
gem5_variant = 'opt'
#gem5_variant = 'debug'
gem5_root = '#../../../..'
target = 'gem5.' + gem5_variant + '.sc'
env = Environment()
# Import PKG_CONFIG_PATH from the external environment
if os.environ.has_key('PKG_CONFIG_PATH'):
env['ENV']['PKG_CONFIG_PATH'] = os.environ['PKG_CONFIG_PATH']
# search for SystemC
env.ParseConfig('pkg-config --cflags --libs systemc')
# add include dirs
env.Append(CPPPATH=[gem5_root + '/build/' + gem5_arch,
gem5_root + '/util/systemc',
gem5_root + '/util/tlm'])
env.Append(LIBS=['gem5_' + gem5_variant])
env.Append(LIBPATH=[gem5_root + '/build/' + gem5_arch])
env.Append(CXXFLAGS=['-std=c++11',
'-DSC_INCLUDE_DYNAMIC_PROCESSES',
'-DTRACING_ON'])
if gem5_variant == 'debug':
env.Append(CXXFLAGS=['-g', '-DDEBUG'])
src_systemc = [gem5_root + '/util/systemc/sc_gem5_control.cc',
gem5_root + '/util/systemc/sc_logger.cc',
gem5_root + '/util/systemc/sc_module.cc',
gem5_root + '/util/systemc/stats.cc']
src_tlm = Glob(gem5_root + '/util/tlm/*.cc')
src_main = Glob('*.cc')
main = env.Program(target, src_systemc + src_tlm + src_main)

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/*
* Copyright (c) 2016, Dresden University of Technology (TU Dresden)
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* 2. 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.
*
* 3. Neither the name of the copyright holder 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 HOLDER
* 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.
*
* Authors: Christian Menard
*/
#include <systemc>
#include <tlm>
#include "sc_master_port.hh"
#include "sim_control.hh"
#include "stats.hh"
#include "traffic_generator.hh"
// Defining global string variable decalred in stats.hh
std::string filename;
void
reportHandler(const sc_core::sc_report& report,
const sc_core::sc_actions& actions)
{
uint64_t systemc_time = report.get_time().value();
uint64_t gem5_time = curTick();
std::cerr << report.get_time();
if (gem5_time < systemc_time) {
std::cerr << " (<) ";
} else if (gem5_time > systemc_time) {
std::cerr << " (!) ";
} else {
std::cerr << " (=) ";
}
std::cerr << ": " << report.get_msg_type() << ' ' << report.get_msg()
<< '\n';
}
int
sc_main(int argc, char** argv)
{
sc_core::sc_report_handler::set_handler(reportHandler);
SimControl simControl("gem5", argc, argv);
TrafficGenerator trafficGenerator("traffic_generator");
filename = "m5out/stats-systemc.txt";
tlm::tlm_target_socket<>* mem_port =
dynamic_cast<tlm::tlm_target_socket<>*>(
sc_core::sc_find_object("gem5.memory"));
if (mem_port) {
SC_REPORT_INFO("sc_main", "Port Found");
trafficGenerator.socket.bind(*mem_port);
} else {
SC_REPORT_FATAL("sc_main", "Port Not Found");
std::exit(EXIT_FAILURE);
}
std::cout << "Starting sc_main" << std::endl;
sc_core::sc_start(); // Run to end of simulation
SC_REPORT_INFO("sc_main", "End of Simulation");
CxxConfig::statsDump();
return EXIT_SUCCESS;
}

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#
# Copyright (c) 2016, Dresden University of Technology (TU Dresden)
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are
# met:
#
# 1. Redistributions of source code must retain the above copyright notice,
# this list of conditions and the following disclaimer.
#
# 2. 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.
#
# 3. Neither the name of the copyright holder 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 HOLDER
# 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.
#
# Authors: Christian Menard
#
import m5
from m5.objects import *
import os
# Base System Architecture:
# +-----+ ^
# | TLM | | TLM World
# +--+--+ | (see main.cc)
# | v
# +----------v-----------+ External Port (see sc_master_port.*)
# | Membus | ^
# +----------+-----------+ |
# | | gem5 World
# +---v----+ |
# | Memory | |
# +--------+ v
#
# Create a system with a Crossbar and a simple Memory:
system = System()
system.membus = IOXBar(width = 16)
system.physmem = SimpleMemory(range = AddrRange('512MB'))
system.clk_domain = SrcClockDomain(clock = '1.5GHz',
voltage_domain = VoltageDomain(voltage = '1V'))
# Create a external TLM port:
system.tlm = ExternalMaster()
system.tlm.port_type = "tlm_master"
system.tlm.port_data = "memory"
# Route the connections:
system.system_port = system.membus.slave
system.physmem.port = system.membus.master
system.tlm.port = system.membus.slave
system.mem_mode = 'timing'
# Start the simulation:
root = Root(full_system = False, system = system)
m5.instantiate()
m5.simulate()

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/*
* Copyright (c) 2016, Dresden University of Technology (TU Dresden)
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* 2. 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.
*
* 3. Neither the name of the copyright holder 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 HOLDER
* 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.
*
* Authors: Christian Menard
*/
#include "base/random.hh"
#include "traffic_generator.hh"
TrafficGenerator::TrafficGenerator(sc_core::sc_module_name name)
: sc_core::sc_module(name),
requestInProgress(0),
peq(this, &TrafficGenerator::peq_cb)
{
socket.register_nb_transport_bw(this, &TrafficGenerator::nb_transport_bw);
SC_THREAD(process);
}
void
TrafficGenerator::process()
{
auto rnd = Random(time(NULL));
unsigned const memSize = (1 << 10); // 512 MB
while (true) {
wait(sc_core::sc_time((double)rnd.random(1,100), sc_core::SC_NS));
auto trans = mm.allocate();
trans->acquire();
std::string cmdStr;
if (rnd.random(0,1)) // Generate a write request?
{
cmdStr = "write";
trans->set_command(tlm::TLM_WRITE_COMMAND);
dataBuffer = rnd.random(0,0xffff);
} else {
cmdStr = "read";
trans->set_command(tlm::TLM_READ_COMMAND);
}
trans->set_data_ptr(reinterpret_cast<unsigned char*>(&dataBuffer));
trans->set_address(rnd.random(0, (int)(memSize-1)));
trans->set_data_length(4);
trans->set_streaming_width(4);
trans->set_byte_enable_ptr(0);
trans->set_dmi_allowed(0);
trans->set_response_status(tlm::TLM_INCOMPLETE_RESPONSE);
// honor the BEGIN_REQ/END_REQ exclusion rule
if (requestInProgress)
sc_core::wait(endRequestEvent);
std::stringstream ss;
ss << "Send " << cmdStr << " request @0x" << std::hex
<< trans->get_address();
SC_REPORT_INFO("Traffic Generator", ss.str().c_str());
// send the request
requestInProgress = trans;
tlm::tlm_phase phase = tlm::BEGIN_REQ;
auto delay = sc_core::SC_ZERO_TIME;
auto status = socket->nb_transport_fw(*trans, phase, delay);
// Check status
if (status == tlm::TLM_UPDATED) {
peq.notify(*trans, phase, delay);
} else if (status == tlm::TLM_COMPLETED) {
requestInProgress = 0;
checkTransaction(*trans);
SC_REPORT_INFO("Traffic Generator", "request completed");
trans->release();
}
}
}
void
TrafficGenerator::peq_cb(tlm::tlm_generic_payload& trans,
const tlm::tlm_phase& phase)
{
if (phase == tlm::END_REQ ||
(&trans == requestInProgress && phase == tlm::BEGIN_RESP)) {
// The end of the BEGIN_REQ phase
requestInProgress = 0;
endRequestEvent.notify();
} else if (phase == tlm::BEGIN_REQ || phase == tlm::END_RESP)
SC_REPORT_FATAL("TLM-2",
"Illegal transaction phase received by initiator");
if (phase == tlm::BEGIN_RESP) {
checkTransaction(trans);
SC_REPORT_INFO("Traffic Generator", "received response");
// Send end response
tlm::tlm_phase fw_phase = tlm::END_RESP;
// stress the retry mechanism by deferring the response
auto delay = sc_core::sc_time(5.0, sc_core::SC_NS);
socket->nb_transport_fw(trans, fw_phase, delay);
trans.release();
}
}
void
TrafficGenerator::checkTransaction(tlm::tlm_generic_payload& trans)
{
if (trans.is_response_error()) {
std::stringstream ss;
ss << "Transaction returned with error, response status = %s"
<< trans.get_response_string();
SC_REPORT_ERROR("TLM-2", ss.str().c_str());
}
}
tlm::tlm_sync_enum
TrafficGenerator::nb_transport_bw(tlm::tlm_generic_payload& trans,
tlm::tlm_phase& phase,
sc_core::sc_time& delay)
{
trans.acquire();
peq.notify(trans, phase, delay);
return tlm::TLM_ACCEPTED;
}

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/*
* Copyright (c) 2016, Dresden University of Technology (TU Dresden)
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* 2. 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.
*
* 3. Neither the name of the copyright holder 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 HOLDER
* 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.
*
* Authors: Christian Menard
*/
#ifndef __TRAFFIC_GENERATOR_HH__
#define __TRAFFIC_GENERATOR_HH__
#include <tlm_utils/peq_with_cb_and_phase.h>
#include <tlm_utils/simple_initiator_socket.h>
#include <systemc>
#include <tlm>
#include "sc_mm.hh"
class TrafficGenerator : public sc_core::sc_module
{
private:
Gem5SystemC::MemoryManager mm;
tlm::tlm_generic_payload* requestInProgress;
uint32_t dataBuffer;
sc_core::sc_event endRequestEvent;
tlm_utils::peq_with_cb_and_phase<TrafficGenerator> peq;
public:
tlm_utils::simple_initiator_socket<TrafficGenerator> socket;
SC_HAS_PROCESS(TrafficGenerator);
TrafficGenerator(sc_core::sc_module_name name);
void process();
void peq_cb(tlm::tlm_generic_payload& trans, const tlm::tlm_phase& phase);
void checkTransaction(tlm::tlm_generic_payload& trans);
virtual tlm::tlm_sync_enum nb_transport_bw(tlm::tlm_generic_payload& trans,
tlm::tlm_phase& phase,
sc_core::sc_time& delay);
};
#endif

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util/tlm/sc_master_port.cc Normal file
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/*
* Copyright (c) 2016, Dresden University of Technology (TU Dresden)
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* 2. 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.
*
* 3. Neither the name of the copyright holder 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 HOLDER
* 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.
*
* Authors: Christian Menard
*/
#include <sstream>
#include "params/ExternalMaster.hh"
#include "sc_master_port.hh"
#include "sim/system.hh"
namespace Gem5SystemC
{
PacketPtr
SCMasterPort::generatePacket(tlm::tlm_generic_payload& trans)
{
Request::Flags flags;
auto req = new Request(trans.get_address(), trans.get_data_length(), flags,
owner.masterId);
MemCmd cmd;
switch (trans.get_command()) {
case tlm::TLM_READ_COMMAND:
cmd = MemCmd::ReadReq;
break;
case tlm::TLM_WRITE_COMMAND:
cmd = MemCmd::WriteReq;
break;
default:
SC_REPORT_FATAL("SCMasterPort",
"received transaction with unsupported command");
}
/*
* Allocate a new Packet. The packet will be deleted when it returns from
* the gem5 world as a response.
*/
auto pkt = new Packet(req, cmd);
pkt->dataStatic(trans.get_data_ptr());
return pkt;
}
void
SCMasterPort::destroyPacket(PacketPtr pkt)
{
delete pkt;
}
SCMasterPort::SCMasterPort(const std::string& name_,
const std::string& systemc_name,
ExternalMaster& owner_,
Module& module)
: ExternalMaster::Port(name_, owner_),
tSocket(systemc_name.c_str()),
peq(this, &SCMasterPort::peq_cb),
waitForRetry(false),
pendingRequest(nullptr),
needToSendRetry(false),
responseInProgress(false),
module(module)
{
auto system =
dynamic_cast<const ExternalMasterParams*>(owner_.params())->system;
/*
* Register the TLM non-blocking interface when using gem5 Timing mode and
* the TLM blocking interface when using the gem5 Atomic mode.
* Then the magic (TM) in simple_target_socket automatically transforms
* non-blocking in blocking transactions and vice versa.
*
* NOTE: The mode may change during execution.
*/
if (system->isTimingMode()) {
SC_REPORT_INFO("SCMasterPort", "register non-blocking interface");
tSocket.register_nb_transport_fw(this,
&SCMasterPort::nb_transport_fw);
} else if (system->isAtomicMode()) {
SC_REPORT_INFO("SCMasterPort", "register blocking interface");
tSocket.register_b_transport(this, &SCMasterPort::b_transport);
} else {
panic("gem5 operates neither in Timing nor in Atomic mode");
}
tSocket.register_transport_dbg(this, &SCMasterPort::transport_dbg);
}
void
SCMasterPort::checkTransaction(tlm::tlm_generic_payload& trans)
{
if (trans.is_response_error()) {
std::stringstream ss;
ss << "Transaction returned with error, response status = "
<< trans.get_response_string();
SC_REPORT_ERROR("TLM-2", ss.str().c_str());
}
}
tlm::tlm_sync_enum
SCMasterPort::nb_transport_fw(tlm::tlm_generic_payload& trans,
tlm::tlm_phase& phase, sc_core::sc_time& delay)
{
uint64_t adr = trans.get_address();
unsigned len = trans.get_data_length();
unsigned char* byteEnable = trans.get_byte_enable_ptr();
unsigned width = trans.get_streaming_width();
// check the transaction attributes for unsupported features ...
if (byteEnable != 0) {
trans.set_response_status(tlm::TLM_BYTE_ENABLE_ERROR_RESPONSE);
return tlm::TLM_COMPLETED;
}
if (width < len) { // is this a burst request?
trans.set_response_status(tlm::TLM_BURST_ERROR_RESPONSE);
return tlm::TLM_COMPLETED;
}
// ... and queue the valid transaction
peq.notify(trans, phase, delay);
return tlm::TLM_ACCEPTED;
}
void
SCMasterPort::peq_cb(tlm::tlm_generic_payload& trans,
const tlm::tlm_phase& phase)
{
// catch up with SystemC time
module.catchup();
assert(curTick() == sc_core::sc_time_stamp().value());
switch (phase) {
case tlm::BEGIN_REQ:
handleBeginReq(trans);
break;
case tlm::END_RESP:
handleEndResp(trans);
break;
default:
panic("unimplemented phase in callback");
}
// the functions called above may have scheduled gem5 events
// -> notify the event loop handler
module.notify();
}
void
SCMasterPort::handleBeginReq(tlm::tlm_generic_payload& trans)
{
sc_assert(!waitForRetry);
sc_assert(pendingRequest == nullptr);
trans.acquire();
auto pkt = generatePacket(trans);
auto tlmSenderState = new TlmSenderState(trans);
pkt->pushSenderState(tlmSenderState);
if (sendTimingReq(pkt)) { // port is free -> send END_REQ immediately
sendEndReq(trans);
} else { // port is blocked -> wait for retry before sending END_REQ
waitForRetry = true;
pendingRequest = &trans;
}
}
void
SCMasterPort::handleEndResp(tlm::tlm_generic_payload& trans)
{
sc_assert(responseInProgress);
responseInProgress = false;
checkTransaction(trans);
if (needToSendRetry) {
sendRetryResp();
needToSendRetry = false;
}
}
void
SCMasterPort::sendEndReq(tlm::tlm_generic_payload& trans)
{
tlm::tlm_phase phase = tlm::END_REQ;
auto delay = sc_core::SC_ZERO_TIME;
auto status = tSocket->nb_transport_bw(trans, phase, delay);
panic_if(status != tlm::TLM_ACCEPTED,
"Unexpected status after sending END_REQ");
}
void
SCMasterPort::b_transport(tlm::tlm_generic_payload& trans,
sc_core::sc_time& t)
{
auto pkt = generatePacket(trans);
// send an atomic request to gem5
Tick ticks = sendAtomic(pkt);
panic_if(!pkt->isResponse(), "Packet sending failed!\n");
// one tick is a pico second
auto delay =
sc_core::sc_time((double)(ticks / SimClock::Int::ps), sc_core::SC_PS);
// update time
t += delay;
destroyPacket(pkt);
trans.set_response_status(tlm::TLM_OK_RESPONSE);
}
unsigned int
SCMasterPort::transport_dbg(tlm::tlm_generic_payload& trans)
{
auto pkt = generatePacket(trans);
sendFunctional(pkt);
destroyPacket(pkt);
return trans.get_data_length();
}
bool
SCMasterPort::get_direct_mem_ptr(tlm::tlm_generic_payload& trans,
tlm::tlm_dmi& dmi_data)
{
return false;
}
bool
SCMasterPort::recvTimingResp(PacketPtr pkt)
{
// exclusion rule
// We need to Wait for END_RESP before sending next BEGIN_RESP
if (responseInProgress) {
sc_assert(!needToSendRetry);
needToSendRetry = true;
return false;
}
sc_assert(pkt->isResponse());
// pay for annotaded transport delays
auto delay =
sc_core::sc_time::from_value(pkt->payloadDelay + pkt->headerDelay);
auto tlmSenderState = dynamic_cast<TlmSenderState*>(pkt->popSenderState());
auto& trans = tlmSenderState->trans;
// clean up
delete tlmSenderState;
destroyPacket(pkt);
sendBeginResp(trans, delay);
trans.release();
return true;
}
void
SCMasterPort::sendBeginResp(tlm::tlm_generic_payload& trans,
sc_core::sc_time& delay)
{
tlm::tlm_phase phase = tlm::BEGIN_RESP;
trans.set_response_status(tlm::TLM_OK_RESPONSE);
auto status = tSocket->nb_transport_bw(trans, phase, delay);
if (status == tlm::TLM_COMPLETED ||
status == tlm::TLM_UPDATED && phase == tlm::END_RESP) {
// transaction completed -> no need to wait for tlm::END_RESP
responseInProgress = false;
} else if (status == tlm::TLM_ACCEPTED) {
// we need to wait for tlm::END_RESP
responseInProgress = true;
} else {
panic("Unexpected status after sending BEGIN_RESP");
}
}
void
SCMasterPort::recvReqRetry()
{
sc_assert(waitForRetry);
sc_assert(pendingRequest != nullptr);
auto& trans = *pendingRequest;
waitForRetry = false;
pendingRequest = nullptr;
// retry
handleBeginReq(trans);
}
void
SCMasterPort::recvRangeChange()
{
SC_REPORT_WARNING("SCMasterPort",
"received address range change but ignored it");
}
class SCMasterPortHandler : public ExternalMaster::Handler
{
Module& module;
public:
SCMasterPortHandler(Module& module) : module(module) {}
ExternalMaster::Port* getExternalPort(const std::string& name,
ExternalMaster& owner,
const std::string& port_data)
{
// This will make a new initiatiator port
return new SCMasterPort(name, port_data, owner, module);
}
};
void
SCMasterPort::registerPortHandler(Module& module)
{
ExternalMaster::registerHandler("tlm_master",
new SCMasterPortHandler(module));
}
} // namespace Gem5SystemC

137
util/tlm/sc_master_port.hh Normal file
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@ -0,0 +1,137 @@
/*
* Copyright (c) 2016, Dresden University of Technology (TU Dresden)
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* 2. 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.
*
* 3. Neither the name of the copyright holder 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 HOLDER
* 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.
*
* Authors: Christian Menard
*/
#ifndef __SC_MASTER_PORT_HH__
#define __SC_MASTER_PORT_HH__
#include <tlm_utils/peq_with_cb_and_phase.h>
#include <tlm_utils/simple_target_socket.h>
#include <tlm>
#include <mem/external_master.hh>
#include <sc_module.hh>
#include <sc_peq.hh>
namespace Gem5SystemC
{
/**
* This is a gem5 master port that translates TLM transactions to gem5 packets.
*
* Upon receiving a TLM transaction (b_transport, nb_transport_fw,
* dbg_transport) the port generates a gem5 packet and initializes the packet
* with information from the transaction payload. The original TLM payload is
* added as a sender state to the gem5 packet. This way the payload can be
* restored when the response packet arrives at the port.
*
* If gem5 operates in atomic mode, the master port registers the TLM blocking
* interface and automatically translates non-blocking requests to blocking.
* If gem5 operates in timing mode, the transactor registers the non-blocking
* interface. Then, the transactor automatically translated blocking requests.
* It is assumed that the mode (atomic/timing) does not change during
* execution.
*/
class SCMasterPort : public ExternalMaster::Port
{
private:
struct TlmSenderState : public Packet::SenderState
{
tlm::tlm_generic_payload& trans;
TlmSenderState(tlm::tlm_generic_payload& trans)
: trans(trans)
{
}
};
tlm_utils::peq_with_cb_and_phase<SCMasterPort> peq;
bool waitForRetry;
tlm::tlm_generic_payload* pendingRequest;
bool needToSendRetry;
bool responseInProgress;
// Keep a reference to the gem5 SystemC module
Module& module;
public:
tlm_utils::simple_target_socket<SCMasterPort> tSocket;
protected:
// payload event call back
void peq_cb(tlm::tlm_generic_payload& trans, const tlm::tlm_phase& phase);
// The TLM target interface
tlm::tlm_sync_enum nb_transport_fw(tlm::tlm_generic_payload& trans,
tlm::tlm_phase& phase,
sc_core::sc_time& t);
void b_transport(tlm::tlm_generic_payload& trans, sc_core::sc_time& t);
unsigned int transport_dbg(tlm::tlm_generic_payload& trans);
bool get_direct_mem_ptr(tlm::tlm_generic_payload& trans,
tlm::tlm_dmi& dmi_data);
// Gem5 SCMasterPort interface
bool recvTimingResp(PacketPtr pkt);
void recvReqRetry();
void recvRangeChange();
public:
SCMasterPort(const std::string& name_,
const std::string& systemc_name,
ExternalMaster& owner_,
Module& module);
static void registerPortHandler(Module& module);
friend PayloadEvent<SCMasterPort>;
private:
void sendEndReq(tlm::tlm_generic_payload& trans);
void sendBeginResp(tlm::tlm_generic_payload& trans,
sc_core::sc_time& delay);
void handleBeginReq(tlm::tlm_generic_payload& trans);
void handleEndResp(tlm::tlm_generic_payload& trans);
PacketPtr generatePacket(tlm::tlm_generic_payload& trans);
void destroyPacket(PacketPtr pkt);
void checkTransaction(tlm::tlm_generic_payload& trans);
};
}
#endif

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@ -46,6 +46,7 @@
#include <systemc>
#include <tlm>
#include "sc_master_port.hh"
#include "sc_slave_port.hh"
#include "sim/cxx_config_ini.hh"
#include "sim/init_signals.hh"
@ -90,6 +91,7 @@ SimControl::SimControl(sc_core::sc_module_name name, int argc_, char** argv_)
cxxConfigInit();
Gem5SystemC::SCSlavePort::registerPortHandler();
Gem5SystemC::SCMasterPort::registerPortHandler(*this);
Trace::setDebugLogger(&logger);