| /* |
| * Copyright (c) 2017-2020 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. |
| * |
| * 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 "mem/qos/mem_ctrl.hh" |
| |
| #include "mem/qos/policy.hh" |
| #include "mem/qos/q_policy.hh" |
| #include "mem/qos/turnaround_policy.hh" |
| #include "sim/core.hh" |
| |
| namespace gem5 |
| { |
| |
| namespace memory |
| { |
| |
| namespace qos |
| { |
| |
| MemCtrl::MemCtrl(const QoSMemCtrlParams &p) |
| : ClockedObject(p), |
| policy(p.qos_policy), |
| turnPolicy(p.qos_turnaround_policy), |
| queuePolicy(QueuePolicy::create(p)), |
| _numPriorities(p.qos_priorities), |
| qosPriorityEscalation(p.qos_priority_escalation), |
| qosSyncroScheduler(p.qos_syncro_scheduler), |
| totalReadQueueSize(0), totalWriteQueueSize(0), |
| busState(READ), busStateNext(READ), |
| stats(*this), |
| _system(p.system) |
| { |
| // Set the priority policy |
| if (policy) { |
| policy->setMemCtrl(this); |
| } |
| |
| // Set the queue priority policy |
| if (queuePolicy) { |
| queuePolicy->setMemCtrl(this); |
| } |
| |
| // Set the bus turnaround policy |
| if (turnPolicy) { |
| turnPolicy->setMemCtrl(this); |
| } |
| |
| readQueueSizes.resize(_numPriorities); |
| writeQueueSizes.resize(_numPriorities); |
| serviceTick.resize(_numPriorities); |
| } |
| |
| MemCtrl::~MemCtrl() |
| {} |
| |
| void |
| MemCtrl::logRequest(BusState dir, RequestorID id, uint8_t _qos, |
| Addr addr, uint64_t entries) |
| { |
| // If needed, initialize all counters and statistics |
| // for this requestor |
| addRequestor(id); |
| |
| DPRINTF(QOS, |
| "qos::MemCtrl::logRequest REQUESTOR %s [id %d] address %#x" |
| " prio %d this requestor q packets %d" |
| " - queue size %d - requested entries %d\n", |
| requestors[id], id, addr, _qos, packetPriorities[id][_qos], |
| (dir == READ) ? readQueueSizes[_qos]: writeQueueSizes[_qos], |
| entries); |
| |
| if (dir == READ) { |
| readQueueSizes[_qos] += entries; |
| totalReadQueueSize += entries; |
| } else if (dir == WRITE) { |
| writeQueueSizes[_qos] += entries; |
| totalWriteQueueSize += entries; |
| } |
| |
| packetPriorities[id][_qos] += entries; |
| for (auto j = 0; j < entries; ++j) { |
| requestTimes[id][addr].push_back(curTick()); |
| } |
| |
| // Record statistics |
| stats.avgPriority[id].sample(_qos); |
| |
| // Compute avg priority distance |
| |
| for (uint8_t i = 0; i < packetPriorities[id].size(); ++i) { |
| uint8_t distance = |
| (abs(int(_qos) - int(i))) * packetPriorities[id][i]; |
| |
| if (distance > 0) { |
| stats.avgPriorityDistance[id].sample(distance); |
| DPRINTF(QOS, |
| "qos::MemCtrl::logRequest REQUESTOR %s [id %d]" |
| " registering priority distance %d for priority %d" |
| " (packets %d)\n", |
| requestors[id], id, distance, i, |
| packetPriorities[id][i]); |
| } |
| } |
| |
| DPRINTF(QOS, |
| "qos::MemCtrl::logRequest REQUESTOR %s [id %d] prio %d " |
| "this requestor q packets %d - new queue size %d\n", |
| requestors[id], id, _qos, packetPriorities[id][_qos], |
| (dir == READ) ? readQueueSizes[_qos]: writeQueueSizes[_qos]); |
| |
| } |
| |
| void |
| MemCtrl::logResponse(BusState dir, RequestorID id, uint8_t _qos, |
| Addr addr, uint64_t entries, double delay) |
| { |
| panic_if(!hasRequestor(id), |
| "Logging response with invalid requestor\n"); |
| |
| DPRINTF(QOS, |
| "qos::MemCtrl::logResponse REQUESTOR %s [id %d] address %#x prio" |
| " %d this requestor q packets %d" |
| " - queue size %d - requested entries %d\n", |
| requestors[id], id, addr, _qos, packetPriorities[id][_qos], |
| (dir == READ) ? readQueueSizes[_qos]: writeQueueSizes[_qos], |
| entries); |
| |
| if (dir == READ) { |
| readQueueSizes[_qos] -= entries; |
| totalReadQueueSize -= entries; |
| } else if (dir == WRITE) { |
| writeQueueSizes[_qos] -= entries; |
| totalWriteQueueSize -= entries; |
| } |
| |
| panic_if(packetPriorities[id][_qos] == 0, |
| "qos::MemCtrl::logResponse requestor %s negative packets " |
| "for priority %d", requestors[id], _qos); |
| |
| packetPriorities[id][_qos] -= entries; |
| |
| for (auto j = 0; j < entries; ++j) { |
| auto it = requestTimes[id].find(addr); |
| panic_if(it == requestTimes[id].end(), |
| "qos::MemCtrl::logResponse requestor %s unmatched response " |
| "for address %#x received", requestors[id], addr); |
| |
| // Load request time |
| uint64_t requestTime = it->second.front(); |
| |
| // Remove request entry |
| it->second.pop_front(); |
| |
| // Remove whole address entry if last one |
| if (it->second.empty()) { |
| requestTimes[id].erase(it); |
| } |
| // Compute latency |
| double latency = (double) (curTick() + delay - requestTime) |
| / sim_clock::as_float::s; |
| |
| if (latency > 0) { |
| // Record per-priority latency stats |
| if (stats.priorityMaxLatency[_qos].value() < latency) { |
| stats.priorityMaxLatency[_qos] = latency; |
| } |
| |
| if (stats.priorityMinLatency[_qos].value() > latency |
| || stats.priorityMinLatency[_qos].value() == 0) { |
| stats.priorityMinLatency[_qos] = latency; |
| } |
| } |
| } |
| |
| DPRINTF(QOS, |
| "qos::MemCtrl::logResponse REQUESTOR %s [id %d] prio %d " |
| "this requestor q packets %d - new queue size %d\n", |
| requestors[id], id, _qos, packetPriorities[id][_qos], |
| (dir == READ) ? readQueueSizes[_qos]: writeQueueSizes[_qos]); |
| } |
| |
| uint8_t |
| MemCtrl::schedule(RequestorID id, uint64_t data) |
| { |
| if (policy) { |
| return policy->schedule(id, data); |
| } else { |
| DPRINTF(QOS, |
| "qos::MemCtrl::schedule requestor id [%d] " |
| "data received [%d], but QoS scheduler not initialized\n", |
| id,data); |
| return 0; |
| } |
| } |
| |
| uint8_t |
| MemCtrl::schedule(const PacketPtr pkt) |
| { |
| assert(pkt->req); |
| |
| if (policy) { |
| return schedule(pkt->req->requestorId(), pkt->getSize()); |
| } else { |
| DPRINTF(QOS, "qos::MemCtrl::schedule Packet received [Qv %d], " |
| "but QoS scheduler not initialized\n", |
| pkt->qosValue()); |
| return pkt->qosValue(); |
| } |
| } |
| |
| MemCtrl::BusState |
| MemCtrl::selectNextBusState() |
| { |
| auto bus_state = getBusState(); |
| |
| if (turnPolicy) { |
| DPRINTF(QOS, |
| "qos::MemCtrl::selectNextBusState running policy %s\n", |
| turnPolicy->name()); |
| |
| bus_state = turnPolicy->selectBusState(); |
| } else { |
| DPRINTF(QOS, |
| "qos::MemCtrl::selectNextBusState running " |
| "default bus direction selection policy\n"); |
| |
| if ((!getTotalReadQueueSize() && bus_state == MemCtrl::READ) || |
| (!getTotalWriteQueueSize() && bus_state == MemCtrl::WRITE)) { |
| // READ/WRITE turnaround |
| bus_state = (bus_state == MemCtrl::READ) ? MemCtrl::WRITE : |
| MemCtrl::READ; |
| |
| } |
| } |
| |
| return bus_state; |
| } |
| |
| void |
| MemCtrl::addRequestor(RequestorID id) |
| { |
| if (!hasRequestor(id)) { |
| requestors.emplace(id, _system->getRequestorName(id)); |
| packetPriorities[id].resize(numPriorities(), 0); |
| |
| DPRINTF(QOS, |
| "qos::MemCtrl::addRequestor registering" |
| " Requestor %s [id %d]\n", |
| requestors[id], id); |
| } |
| } |
| |
| MemCtrl::MemCtrlStats::MemCtrlStats(MemCtrl &mc) |
| : statistics::Group(&mc), |
| memCtrl(mc), |
| |
| ADD_STAT(avgPriority, statistics::units::Count::get(), |
| "Average QoS priority value for accepted requests"), |
| ADD_STAT(avgPriorityDistance, statistics::units::Count::get(), |
| "Average QoS priority distance between assigned and queued " |
| "values"), |
| |
| ADD_STAT(priorityMinLatency, statistics::units::Second::get(), |
| "per QoS priority minimum request to response latency"), |
| ADD_STAT(priorityMaxLatency, statistics::units::Second::get(), |
| "per QoS priority maximum request to response latency"), |
| ADD_STAT(numReadWriteTurnArounds, statistics::units::Count::get(), |
| "Number of turnarounds from READ to WRITE"), |
| ADD_STAT(numWriteReadTurnArounds, statistics::units::Count::get(), |
| "Number of turnarounds from WRITE to READ"), |
| ADD_STAT(numStayReadState, statistics::units::Count::get(), |
| "Number of times bus staying in READ state"), |
| ADD_STAT(numStayWriteState, statistics::units::Count::get(), |
| "Number of times bus staying in WRITE state") |
| { |
| } |
| |
| void |
| MemCtrl::MemCtrlStats::regStats() |
| { |
| statistics::Group::regStats(); |
| |
| using namespace statistics; |
| |
| System *system = memCtrl._system; |
| const auto max_requestors = system->maxRequestors(); |
| const auto num_priorities = memCtrl.numPriorities(); |
| |
| // Initializes per requestor statistics |
| avgPriority |
| .init(max_requestors) |
| .flags(nozero | nonan) |
| .precision(2) |
| ; |
| |
| avgPriorityDistance |
| .init(max_requestors) |
| .flags(nozero | nonan) |
| ; |
| |
| priorityMinLatency |
| .init(num_priorities) |
| .precision(12) |
| ; |
| |
| priorityMaxLatency |
| .init(num_priorities) |
| .precision(12) |
| ; |
| |
| for (int i = 0; i < max_requestors; i++) { |
| const std::string name = system->getRequestorName(i); |
| avgPriority.subname(i, name); |
| avgPriorityDistance.subname(i, name); |
| } |
| |
| for (int j = 0; j < num_priorities; ++j) { |
| priorityMinLatency.subname(j, std::to_string(j)); |
| priorityMaxLatency.subname(j, std::to_string(j)); |
| } |
| } |
| |
| void |
| MemCtrl::recordTurnaroundStats() |
| { |
| if (busStateNext != busState) { |
| if (busState == READ) { |
| stats.numWriteReadTurnArounds++; |
| } else if (busState == WRITE) { |
| stats.numReadWriteTurnArounds++; |
| } |
| } else { |
| if (busState == READ) { |
| stats.numStayReadState++; |
| } else if (busState == WRITE) { |
| stats.numStayWriteState++; |
| } |
| } |
| } |
| |
| } // namespace qos |
| } // namespace memory |
| } // namespace gem5 |
