dram_ctrl.hh revision 11168
19243SN/A/* 210889Sandreas.hansson@arm.com * Copyright (c) 2012-2015 ARM Limited 39243SN/A * All rights reserved 49243SN/A * 59243SN/A * The license below extends only to copyright in the software and shall 69243SN/A * not be construed as granting a license to any other intellectual 79243SN/A * property including but not limited to intellectual property relating 89243SN/A * to a hardware implementation of the functionality of the software 99243SN/A * licensed hereunder. You may use the software subject to the license 109243SN/A * terms below provided that you ensure that this notice is replicated 119243SN/A * unmodified and in its entirety in all distributions of the software, 129243SN/A * modified or unmodified, in source code or in binary form. 139243SN/A * 149831SN/A * Copyright (c) 2013 Amin Farmahini-Farahani 159831SN/A * All rights reserved. 169831SN/A * 179243SN/A * Redistribution and use in source and binary forms, with or without 189243SN/A * modification, are permitted provided that the following conditions are 199243SN/A * met: redistributions of source code must retain the above copyright 209243SN/A * notice, this list of conditions and the following disclaimer; 219243SN/A * redistributions in binary form must reproduce the above copyright 229243SN/A * notice, this list of conditions and the following disclaimer in the 239243SN/A * documentation and/or other materials provided with the distribution; 249243SN/A * neither the name of the copyright holders nor the names of its 259243SN/A * contributors may be used to endorse or promote products derived from 269243SN/A * this software without specific prior written permission. 279243SN/A * 289243SN/A * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 299243SN/A * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 309243SN/A * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 319243SN/A * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 329243SN/A * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 339243SN/A * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 349243SN/A * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 359243SN/A * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 369243SN/A * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 379243SN/A * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 389243SN/A * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 399243SN/A * 409243SN/A * Authors: Andreas Hansson 419243SN/A * Ani Udipi 429967SN/A * Neha Agarwal 4310618SOmar.Naji@arm.com * Omar Naji 449243SN/A */ 459243SN/A 469243SN/A/** 479243SN/A * @file 4810146Sandreas.hansson@arm.com * DRAMCtrl declaration 499243SN/A */ 509243SN/A 5110146Sandreas.hansson@arm.com#ifndef __MEM_DRAM_CTRL_HH__ 5210146Sandreas.hansson@arm.com#define __MEM_DRAM_CTRL_HH__ 539243SN/A 549488SN/A#include <deque> 5510618SOmar.Naji@arm.com#include <string> 5610889Sandreas.hansson@arm.com#include <unordered_set> 579488SN/A 589243SN/A#include "base/statistics.hh" 599243SN/A#include "enums/AddrMap.hh" 609243SN/A#include "enums/MemSched.hh" 619243SN/A#include "enums/PageManage.hh" 629243SN/A#include "mem/abstract_mem.hh" 639243SN/A#include "mem/qport.hh" 6410146Sandreas.hansson@arm.com#include "params/DRAMCtrl.hh" 659243SN/A#include "sim/eventq.hh" 6610432SOmar.Naji@arm.com#include "mem/drampower.hh" 679243SN/A 689243SN/A/** 6910287Sandreas.hansson@arm.com * The DRAM controller is a single-channel memory controller capturing 7010287Sandreas.hansson@arm.com * the most important timing constraints associated with a 7110287Sandreas.hansson@arm.com * contemporary DRAM. For multi-channel memory systems, the controller 7210287Sandreas.hansson@arm.com * is combined with a crossbar model, with the channel address 7310287Sandreas.hansson@arm.com * interleaving taking part in the crossbar. 749243SN/A * 7510287Sandreas.hansson@arm.com * As a basic design principle, this controller 7610287Sandreas.hansson@arm.com * model is not cycle callable, but instead uses events to: 1) decide 7710287Sandreas.hansson@arm.com * when new decisions can be made, 2) when resources become available, 7810287Sandreas.hansson@arm.com * 3) when things are to be considered done, and 4) when to send 7910287Sandreas.hansson@arm.com * things back. Through these simple principles, the model delivers 8010287Sandreas.hansson@arm.com * high performance, and lots of flexibility, allowing users to 8110287Sandreas.hansson@arm.com * evaluate the system impact of a wide range of memory technologies, 8210287Sandreas.hansson@arm.com * such as DDR3/4, LPDDR2/3/4, WideIO1/2, HBM and HMC. 8310287Sandreas.hansson@arm.com * 8410287Sandreas.hansson@arm.com * For more details, please see Hansson et al, "Simulating DRAM 8510287Sandreas.hansson@arm.com * controllers for future system architecture exploration", 8610287Sandreas.hansson@arm.com * Proc. ISPASS, 2014. If you use this model as part of your research 8710287Sandreas.hansson@arm.com * please cite the paper. 889243SN/A */ 8910146Sandreas.hansson@arm.comclass DRAMCtrl : public AbstractMemory 909243SN/A{ 919243SN/A 929243SN/A private: 939243SN/A 949243SN/A // For now, make use of a queued slave port to avoid dealing with 959243SN/A // flow control for the responses being sent back 969243SN/A class MemoryPort : public QueuedSlavePort 979243SN/A { 989243SN/A 9910713Sandreas.hansson@arm.com RespPacketQueue queue; 10010146Sandreas.hansson@arm.com DRAMCtrl& memory; 1019243SN/A 1029243SN/A public: 1039243SN/A 10410146Sandreas.hansson@arm.com MemoryPort(const std::string& name, DRAMCtrl& _memory); 1059243SN/A 1069243SN/A protected: 1079243SN/A 1089243SN/A Tick recvAtomic(PacketPtr pkt); 1099243SN/A 1109243SN/A void recvFunctional(PacketPtr pkt); 1119243SN/A 1129243SN/A bool recvTimingReq(PacketPtr); 1139243SN/A 1149243SN/A virtual AddrRangeList getAddrRanges() const; 1159243SN/A 1169243SN/A }; 1179243SN/A 1189243SN/A /** 1199243SN/A * Our incoming port, for a multi-ported controller add a crossbar 1209243SN/A * in front of it 1219243SN/A */ 1229243SN/A MemoryPort port; 1239243SN/A 1249243SN/A /** 12510619Sandreas.hansson@arm.com * Remeber if the memory system is in timing mode 12610619Sandreas.hansson@arm.com */ 12710619Sandreas.hansson@arm.com bool isTimingMode; 12810619Sandreas.hansson@arm.com 12910619Sandreas.hansson@arm.com /** 1309243SN/A * Remember if we have to retry a request when available. 1319243SN/A */ 1329243SN/A bool retryRdReq; 1339243SN/A bool retryWrReq; 1349243SN/A 1359243SN/A /** 13610206Sandreas.hansson@arm.com * Bus state used to control the read/write switching and drive 13710206Sandreas.hansson@arm.com * the scheduling of the next request. 1389243SN/A */ 13910206Sandreas.hansson@arm.com enum BusState { 14010206Sandreas.hansson@arm.com READ = 0, 14110206Sandreas.hansson@arm.com READ_TO_WRITE, 14210206Sandreas.hansson@arm.com WRITE, 14310206Sandreas.hansson@arm.com WRITE_TO_READ 14410206Sandreas.hansson@arm.com }; 14510206Sandreas.hansson@arm.com 14610206Sandreas.hansson@arm.com BusState busState; 1479243SN/A 1489243SN/A /** 14910210Sandreas.hansson@arm.com * A basic class to track the bank state, i.e. what row is 15010210Sandreas.hansson@arm.com * currently open (if any), when is the bank free to accept a new 15110211Sandreas.hansson@arm.com * column (read/write) command, when can it be precharged, and 15210211Sandreas.hansson@arm.com * when can it be activated. 15310210Sandreas.hansson@arm.com * 15410210Sandreas.hansson@arm.com * The bank also keeps track of how many bytes have been accessed 15510210Sandreas.hansson@arm.com * in the open row since it was opened. 1569243SN/A */ 1579243SN/A class Bank 1589243SN/A { 1599243SN/A 1609243SN/A public: 1619243SN/A 16210207Sandreas.hansson@arm.com static const uint32_t NO_ROW = -1; 1639243SN/A 1649243SN/A uint32_t openRow; 16510246Sandreas.hansson@arm.com uint8_t bank; 16610394Swendy.elsasser@arm.com uint8_t bankgr; 1679243SN/A 16810211Sandreas.hansson@arm.com Tick colAllowedAt; 16910210Sandreas.hansson@arm.com Tick preAllowedAt; 1709969SN/A Tick actAllowedAt; 1719243SN/A 17210141SN/A uint32_t rowAccesses; 1739727SN/A uint32_t bytesAccessed; 1749727SN/A 1759727SN/A Bank() : 17610618SOmar.Naji@arm.com openRow(NO_ROW), bank(0), bankgr(0), 17710246Sandreas.hansson@arm.com colAllowedAt(0), preAllowedAt(0), actAllowedAt(0), 17810141SN/A rowAccesses(0), bytesAccessed(0) 1799243SN/A { } 1809243SN/A }; 1819243SN/A 18210618SOmar.Naji@arm.com 18310618SOmar.Naji@arm.com /** 18410618SOmar.Naji@arm.com * Rank class includes a vector of banks. Refresh and Power state 18510618SOmar.Naji@arm.com * machines are defined per rank. Events required to change the 18610618SOmar.Naji@arm.com * state of the refresh and power state machine are scheduled per 18710618SOmar.Naji@arm.com * rank. This class allows the implementation of rank-wise refresh 18810618SOmar.Naji@arm.com * and rank-wise power-down. 18910618SOmar.Naji@arm.com */ 19010618SOmar.Naji@arm.com class Rank : public EventManager 19110618SOmar.Naji@arm.com { 19210618SOmar.Naji@arm.com 19310618SOmar.Naji@arm.com private: 19410618SOmar.Naji@arm.com 19510618SOmar.Naji@arm.com /** 19610618SOmar.Naji@arm.com * The power state captures the different operational states of 19710618SOmar.Naji@arm.com * the DRAM and interacts with the bus read/write state machine, 19810618SOmar.Naji@arm.com * and the refresh state machine. In the idle state all banks are 19910618SOmar.Naji@arm.com * precharged. From there we either go to an auto refresh (as 20010618SOmar.Naji@arm.com * determined by the refresh state machine), or to a precharge 20110618SOmar.Naji@arm.com * power down mode. From idle the memory can also go to the active 20210618SOmar.Naji@arm.com * state (with one or more banks active), and in turn from there 20310618SOmar.Naji@arm.com * to active power down. At the moment we do not capture the deep 20410618SOmar.Naji@arm.com * power down and self-refresh state. 20510618SOmar.Naji@arm.com */ 20610618SOmar.Naji@arm.com enum PowerState { 20710618SOmar.Naji@arm.com PWR_IDLE = 0, 20810618SOmar.Naji@arm.com PWR_REF, 20910618SOmar.Naji@arm.com PWR_PRE_PDN, 21010618SOmar.Naji@arm.com PWR_ACT, 21110618SOmar.Naji@arm.com PWR_ACT_PDN 21210618SOmar.Naji@arm.com }; 21310618SOmar.Naji@arm.com 21410618SOmar.Naji@arm.com /** 21510618SOmar.Naji@arm.com * The refresh state is used to control the progress of the 21610618SOmar.Naji@arm.com * refresh scheduling. When normal operation is in progress the 21710618SOmar.Naji@arm.com * refresh state is idle. From there, it progresses to the refresh 21810618SOmar.Naji@arm.com * drain state once tREFI has passed. The refresh drain state 21910618SOmar.Naji@arm.com * captures the DRAM row active state, as it will stay there until 22010618SOmar.Naji@arm.com * all ongoing accesses complete. Thereafter all banks are 22110618SOmar.Naji@arm.com * precharged, and lastly, the DRAM is refreshed. 22210618SOmar.Naji@arm.com */ 22310618SOmar.Naji@arm.com enum RefreshState { 22410618SOmar.Naji@arm.com REF_IDLE = 0, 22510618SOmar.Naji@arm.com REF_DRAIN, 22610618SOmar.Naji@arm.com REF_PRE, 22710618SOmar.Naji@arm.com REF_RUN 22810618SOmar.Naji@arm.com }; 22910618SOmar.Naji@arm.com 23010618SOmar.Naji@arm.com /** 23110618SOmar.Naji@arm.com * A reference to the parent DRAMCtrl instance 23210618SOmar.Naji@arm.com */ 23310618SOmar.Naji@arm.com DRAMCtrl& memory; 23410618SOmar.Naji@arm.com 23510618SOmar.Naji@arm.com /** 23610618SOmar.Naji@arm.com * Since we are taking decisions out of order, we need to keep 23710618SOmar.Naji@arm.com * track of what power transition is happening at what time, such 23810618SOmar.Naji@arm.com * that we can go back in time and change history. For example, if 23910618SOmar.Naji@arm.com * we precharge all banks and schedule going to the idle state, we 24010618SOmar.Naji@arm.com * might at a later point decide to activate a bank before the 24110618SOmar.Naji@arm.com * transition to idle would have taken place. 24210618SOmar.Naji@arm.com */ 24310618SOmar.Naji@arm.com PowerState pwrStateTrans; 24410618SOmar.Naji@arm.com 24510618SOmar.Naji@arm.com /** 24610618SOmar.Naji@arm.com * Current power state. 24710618SOmar.Naji@arm.com */ 24810618SOmar.Naji@arm.com PowerState pwrState; 24910618SOmar.Naji@arm.com 25010618SOmar.Naji@arm.com /** 25110618SOmar.Naji@arm.com * Track when we transitioned to the current power state 25210618SOmar.Naji@arm.com */ 25310618SOmar.Naji@arm.com Tick pwrStateTick; 25410618SOmar.Naji@arm.com 25510618SOmar.Naji@arm.com /** 25610618SOmar.Naji@arm.com * current refresh state 25710618SOmar.Naji@arm.com */ 25810618SOmar.Naji@arm.com RefreshState refreshState; 25910618SOmar.Naji@arm.com 26010618SOmar.Naji@arm.com /** 26110618SOmar.Naji@arm.com * Keep track of when a refresh is due. 26210618SOmar.Naji@arm.com */ 26310618SOmar.Naji@arm.com Tick refreshDueAt; 26410618SOmar.Naji@arm.com 26510618SOmar.Naji@arm.com /* 26610618SOmar.Naji@arm.com * Command energies 26710618SOmar.Naji@arm.com */ 26810618SOmar.Naji@arm.com Stats::Scalar actEnergy; 26910618SOmar.Naji@arm.com Stats::Scalar preEnergy; 27010618SOmar.Naji@arm.com Stats::Scalar readEnergy; 27110618SOmar.Naji@arm.com Stats::Scalar writeEnergy; 27210618SOmar.Naji@arm.com Stats::Scalar refreshEnergy; 27310618SOmar.Naji@arm.com 27410618SOmar.Naji@arm.com /* 27510618SOmar.Naji@arm.com * Active Background Energy 27610618SOmar.Naji@arm.com */ 27710618SOmar.Naji@arm.com Stats::Scalar actBackEnergy; 27810618SOmar.Naji@arm.com 27910618SOmar.Naji@arm.com /* 28010618SOmar.Naji@arm.com * Precharge Background Energy 28110618SOmar.Naji@arm.com */ 28210618SOmar.Naji@arm.com Stats::Scalar preBackEnergy; 28310618SOmar.Naji@arm.com 28410618SOmar.Naji@arm.com Stats::Scalar totalEnergy; 28510618SOmar.Naji@arm.com Stats::Scalar averagePower; 28610618SOmar.Naji@arm.com 28710618SOmar.Naji@arm.com /** 28810618SOmar.Naji@arm.com * Track time spent in each power state. 28910618SOmar.Naji@arm.com */ 29010618SOmar.Naji@arm.com Stats::Vector pwrStateTime; 29110618SOmar.Naji@arm.com 29210618SOmar.Naji@arm.com /** 29310618SOmar.Naji@arm.com * Function to update Power Stats 29410618SOmar.Naji@arm.com */ 29510618SOmar.Naji@arm.com void updatePowerStats(); 29610618SOmar.Naji@arm.com 29710618SOmar.Naji@arm.com /** 29810618SOmar.Naji@arm.com * Schedule a power state transition in the future, and 29910618SOmar.Naji@arm.com * potentially override an already scheduled transition. 30010618SOmar.Naji@arm.com * 30110618SOmar.Naji@arm.com * @param pwr_state Power state to transition to 30210618SOmar.Naji@arm.com * @param tick Tick when transition should take place 30310618SOmar.Naji@arm.com */ 30410618SOmar.Naji@arm.com void schedulePowerEvent(PowerState pwr_state, Tick tick); 30510618SOmar.Naji@arm.com 30610618SOmar.Naji@arm.com public: 30710618SOmar.Naji@arm.com 30810618SOmar.Naji@arm.com /** 30910618SOmar.Naji@arm.com * Current Rank index 31010618SOmar.Naji@arm.com */ 31110618SOmar.Naji@arm.com uint8_t rank; 31210618SOmar.Naji@arm.com 31310618SOmar.Naji@arm.com /** 31410618SOmar.Naji@arm.com * One DRAMPower instance per rank 31510618SOmar.Naji@arm.com */ 31610618SOmar.Naji@arm.com DRAMPower power; 31710618SOmar.Naji@arm.com 31810618SOmar.Naji@arm.com /** 31910618SOmar.Naji@arm.com * Vector of Banks. Each rank is made of several devices which in 32010618SOmar.Naji@arm.com * term are made from several banks. 32110618SOmar.Naji@arm.com */ 32210618SOmar.Naji@arm.com std::vector<Bank> banks; 32310618SOmar.Naji@arm.com 32410618SOmar.Naji@arm.com /** 32510618SOmar.Naji@arm.com * To track number of banks which are currently active for 32610618SOmar.Naji@arm.com * this rank. 32710618SOmar.Naji@arm.com */ 32810618SOmar.Naji@arm.com unsigned int numBanksActive; 32910618SOmar.Naji@arm.com 33010618SOmar.Naji@arm.com /** List to keep track of activate ticks */ 33110618SOmar.Naji@arm.com std::deque<Tick> actTicks; 33210618SOmar.Naji@arm.com 33310618SOmar.Naji@arm.com Rank(DRAMCtrl& _memory, const DRAMCtrlParams* _p); 33410618SOmar.Naji@arm.com 33510618SOmar.Naji@arm.com const std::string name() const 33610618SOmar.Naji@arm.com { 33710618SOmar.Naji@arm.com return csprintf("%s_%d", memory.name(), rank); 33810618SOmar.Naji@arm.com } 33910618SOmar.Naji@arm.com 34010618SOmar.Naji@arm.com /** 34110618SOmar.Naji@arm.com * Kick off accounting for power and refresh states and 34210618SOmar.Naji@arm.com * schedule initial refresh. 34310618SOmar.Naji@arm.com * 34410618SOmar.Naji@arm.com * @param ref_tick Tick for first refresh 34510618SOmar.Naji@arm.com */ 34610618SOmar.Naji@arm.com void startup(Tick ref_tick); 34710618SOmar.Naji@arm.com 34810618SOmar.Naji@arm.com /** 34910619Sandreas.hansson@arm.com * Stop the refresh events. 35010619Sandreas.hansson@arm.com */ 35110619Sandreas.hansson@arm.com void suspend(); 35210619Sandreas.hansson@arm.com 35310619Sandreas.hansson@arm.com /** 35410618SOmar.Naji@arm.com * Check if the current rank is available for scheduling. 35510618SOmar.Naji@arm.com * 35610618SOmar.Naji@arm.com * @param Return true if the rank is idle from a refresh point of view 35710618SOmar.Naji@arm.com */ 35810618SOmar.Naji@arm.com bool isAvailable() const { return refreshState == REF_IDLE; } 35910618SOmar.Naji@arm.com 36010618SOmar.Naji@arm.com /** 36110618SOmar.Naji@arm.com * Let the rank check if it was waiting for requests to drain 36210618SOmar.Naji@arm.com * to allow it to transition states. 36310618SOmar.Naji@arm.com */ 36410618SOmar.Naji@arm.com void checkDrainDone(); 36510618SOmar.Naji@arm.com 36610618SOmar.Naji@arm.com /* 36710618SOmar.Naji@arm.com * Function to register Stats 36810618SOmar.Naji@arm.com */ 36910618SOmar.Naji@arm.com void regStats(); 37010618SOmar.Naji@arm.com 37110618SOmar.Naji@arm.com void processActivateEvent(); 37210618SOmar.Naji@arm.com EventWrapper<Rank, &Rank::processActivateEvent> 37310618SOmar.Naji@arm.com activateEvent; 37410618SOmar.Naji@arm.com 37510618SOmar.Naji@arm.com void processPrechargeEvent(); 37610618SOmar.Naji@arm.com EventWrapper<Rank, &Rank::processPrechargeEvent> 37710618SOmar.Naji@arm.com prechargeEvent; 37810618SOmar.Naji@arm.com 37910618SOmar.Naji@arm.com void processRefreshEvent(); 38010618SOmar.Naji@arm.com EventWrapper<Rank, &Rank::processRefreshEvent> 38110618SOmar.Naji@arm.com refreshEvent; 38210618SOmar.Naji@arm.com 38310618SOmar.Naji@arm.com void processPowerEvent(); 38410618SOmar.Naji@arm.com EventWrapper<Rank, &Rank::processPowerEvent> 38510618SOmar.Naji@arm.com powerEvent; 38610618SOmar.Naji@arm.com 38710618SOmar.Naji@arm.com }; 38810618SOmar.Naji@arm.com 3899243SN/A /** 3909831SN/A * A burst helper helps organize and manage a packet that is larger than 3919831SN/A * the DRAM burst size. A system packet that is larger than the burst size 3929831SN/A * is split into multiple DRAM packets and all those DRAM packets point to 3939831SN/A * a single burst helper such that we know when the whole packet is served. 3949831SN/A */ 3959831SN/A class BurstHelper { 3969831SN/A 3979831SN/A public: 3989831SN/A 3999831SN/A /** Number of DRAM bursts requred for a system packet **/ 4009831SN/A const unsigned int burstCount; 4019831SN/A 4029831SN/A /** Number of DRAM bursts serviced so far for a system packet **/ 4039831SN/A unsigned int burstsServiced; 4049831SN/A 4059831SN/A BurstHelper(unsigned int _burstCount) 4069831SN/A : burstCount(_burstCount), burstsServiced(0) 40710618SOmar.Naji@arm.com { } 4089831SN/A }; 4099831SN/A 4109831SN/A /** 4119243SN/A * A DRAM packet stores packets along with the timestamp of when 4129243SN/A * the packet entered the queue, and also the decoded address. 4139243SN/A */ 4149243SN/A class DRAMPacket { 4159243SN/A 4169243SN/A public: 4179243SN/A 4189243SN/A /** When did request enter the controller */ 4199243SN/A const Tick entryTime; 4209243SN/A 4219243SN/A /** When will request leave the controller */ 4229243SN/A Tick readyTime; 4239243SN/A 4249243SN/A /** This comes from the outside world */ 4259243SN/A const PacketPtr pkt; 4269243SN/A 4279966SN/A const bool isRead; 4289966SN/A 4299243SN/A /** Will be populated by address decoder */ 4309243SN/A const uint8_t rank; 4319967SN/A const uint8_t bank; 43210245Sandreas.hansson@arm.com const uint32_t row; 4339831SN/A 4349831SN/A /** 4359967SN/A * Bank id is calculated considering banks in all the ranks 4369967SN/A * eg: 2 ranks each with 8 banks, then bankId = 0 --> rank0, bank0 and 4379967SN/A * bankId = 8 --> rank1, bank0 4389967SN/A */ 4399967SN/A const uint16_t bankId; 4409967SN/A 4419967SN/A /** 4429831SN/A * The starting address of the DRAM packet. 4439831SN/A * This address could be unaligned to burst size boundaries. The 4449831SN/A * reason is to keep the address offset so we can accurately check 4459831SN/A * incoming read packets with packets in the write queue. 4469831SN/A */ 4479832SN/A Addr addr; 4489831SN/A 4499831SN/A /** 4509831SN/A * The size of this dram packet in bytes 4519831SN/A * It is always equal or smaller than DRAM burst size 4529831SN/A */ 4539832SN/A unsigned int size; 4549831SN/A 4559831SN/A /** 4569831SN/A * A pointer to the BurstHelper if this DRAMPacket is a split packet 4579831SN/A * If not a split packet (common case), this is set to NULL 4589831SN/A */ 4599831SN/A BurstHelper* burstHelper; 4609967SN/A Bank& bankRef; 46110618SOmar.Naji@arm.com Rank& rankRef; 4629243SN/A 4639967SN/A DRAMPacket(PacketPtr _pkt, bool is_read, uint8_t _rank, uint8_t _bank, 46410245Sandreas.hansson@arm.com uint32_t _row, uint16_t bank_id, Addr _addr, 46510618SOmar.Naji@arm.com unsigned int _size, Bank& bank_ref, Rank& rank_ref) 4669243SN/A : entryTime(curTick()), readyTime(curTick()), 4679967SN/A pkt(_pkt), isRead(is_read), rank(_rank), bank(_bank), row(_row), 4689967SN/A bankId(bank_id), addr(_addr), size(_size), burstHelper(NULL), 46910618SOmar.Naji@arm.com bankRef(bank_ref), rankRef(rank_ref) 4709243SN/A { } 4719243SN/A 4729243SN/A }; 4739243SN/A 4749243SN/A /** 4759243SN/A * Bunch of things requires to setup "events" in gem5 47610206Sandreas.hansson@arm.com * When event "respondEvent" occurs for example, the method 47710206Sandreas.hansson@arm.com * processRespondEvent is called; no parameters are allowed 4789243SN/A * in these methods 4799243SN/A */ 48010208Sandreas.hansson@arm.com void processNextReqEvent(); 48110208Sandreas.hansson@arm.com EventWrapper<DRAMCtrl,&DRAMCtrl::processNextReqEvent> nextReqEvent; 48210208Sandreas.hansson@arm.com 4839243SN/A void processRespondEvent(); 48410146Sandreas.hansson@arm.com EventWrapper<DRAMCtrl, &DRAMCtrl::processRespondEvent> respondEvent; 4859243SN/A 4869243SN/A /** 4879243SN/A * Check if the read queue has room for more entries 4889243SN/A * 4899831SN/A * @param pktCount The number of entries needed in the read queue 4909243SN/A * @return true if read queue is full, false otherwise 4919243SN/A */ 4929831SN/A bool readQueueFull(unsigned int pktCount) const; 4939243SN/A 4949243SN/A /** 4959243SN/A * Check if the write queue has room for more entries 4969243SN/A * 4979831SN/A * @param pktCount The number of entries needed in the write queue 4989243SN/A * @return true if write queue is full, false otherwise 4999243SN/A */ 5009831SN/A bool writeQueueFull(unsigned int pktCount) const; 5019243SN/A 5029243SN/A /** 5039243SN/A * When a new read comes in, first check if the write q has a 5049243SN/A * pending request to the same address.\ If not, decode the 5059831SN/A * address to populate rank/bank/row, create one or mutliple 5069831SN/A * "dram_pkt", and push them to the back of the read queue.\ 5079831SN/A * If this is the only 5089243SN/A * read request in the system, schedule an event to start 5099243SN/A * servicing it. 5109243SN/A * 5119243SN/A * @param pkt The request packet from the outside world 5129831SN/A * @param pktCount The number of DRAM bursts the pkt 5139831SN/A * translate to. If pkt size is larger then one full burst, 5149831SN/A * then pktCount is greater than one. 5159243SN/A */ 5169831SN/A void addToReadQueue(PacketPtr pkt, unsigned int pktCount); 5179243SN/A 5189243SN/A /** 5199243SN/A * Decode the incoming pkt, create a dram_pkt and push to the 5209243SN/A * back of the write queue. \If the write q length is more than 5219243SN/A * the threshold specified by the user, ie the queue is beginning 5229243SN/A * to get full, stop reads, and start draining writes. 5239243SN/A * 5249243SN/A * @param pkt The request packet from the outside world 5259831SN/A * @param pktCount The number of DRAM bursts the pkt 5269831SN/A * translate to. If pkt size is larger then one full burst, 5279831SN/A * then pktCount is greater than one. 5289243SN/A */ 5299831SN/A void addToWriteQueue(PacketPtr pkt, unsigned int pktCount); 5309243SN/A 5319243SN/A /** 5329243SN/A * Actually do the DRAM access - figure out the latency it 5339243SN/A * will take to service the req based on bank state, channel state etc 5349243SN/A * and then update those states to account for this request.\ Based 5359243SN/A * on this, update the packet's "readyTime" and move it to the 5369243SN/A * response q from where it will eventually go back to the outside 5379243SN/A * world. 5389243SN/A * 5399243SN/A * @param pkt The DRAM packet created from the outside world pkt 5409243SN/A */ 5419243SN/A void doDRAMAccess(DRAMPacket* dram_pkt); 5429243SN/A 5439243SN/A /** 5449243SN/A * When a packet reaches its "readyTime" in the response Q, 5459243SN/A * use the "access()" method in AbstractMemory to actually 5469243SN/A * create the response packet, and send it back to the outside 5479243SN/A * world requestor. 5489243SN/A * 5499243SN/A * @param pkt The packet from the outside world 5509726SN/A * @param static_latency Static latency to add before sending the packet 5519243SN/A */ 5529726SN/A void accessAndRespond(PacketPtr pkt, Tick static_latency); 5539243SN/A 5549243SN/A /** 5559243SN/A * Address decoder to figure out physical mapping onto ranks, 5569831SN/A * banks, and rows. This function is called multiple times on the same 5579831SN/A * system packet if the pakcet is larger than burst of the memory. The 5589831SN/A * dramPktAddr is used for the offset within the packet. 5599243SN/A * 5609243SN/A * @param pkt The packet from the outside world 5619831SN/A * @param dramPktAddr The starting address of the DRAM packet 5629831SN/A * @param size The size of the DRAM packet in bytes 5639966SN/A * @param isRead Is the request for a read or a write to DRAM 5649243SN/A * @return A DRAMPacket pointer with the decoded information 5659243SN/A */ 56610143SN/A DRAMPacket* decodeAddr(PacketPtr pkt, Addr dramPktAddr, unsigned int size, 56710143SN/A bool isRead); 5689243SN/A 5699243SN/A /** 57010206Sandreas.hansson@arm.com * The memory schduler/arbiter - picks which request needs to 5719567SN/A * go next, based on the specified policy such as FCFS or FR-FCFS 57210206Sandreas.hansson@arm.com * and moves it to the head of the queue. 57310393Swendy.elsasser@arm.com * Prioritizes accesses to the same rank as previous burst unless 57410393Swendy.elsasser@arm.com * controller is switching command type. 57510393Swendy.elsasser@arm.com * 57610393Swendy.elsasser@arm.com * @param queue Queued requests to consider 57710890Swendy.elsasser@arm.com * @param extra_col_delay Any extra delay due to a read/write switch 57810618SOmar.Naji@arm.com * @return true if a packet is scheduled to a rank which is available else 57910618SOmar.Naji@arm.com * false 5809243SN/A */ 58110890Swendy.elsasser@arm.com bool chooseNext(std::deque<DRAMPacket*>& queue, Tick extra_col_delay); 5829243SN/A 5839243SN/A /** 5849974SN/A * For FR-FCFS policy reorder the read/write queue depending on row buffer 58510890Swendy.elsasser@arm.com * hits and earliest bursts available in DRAM 58610393Swendy.elsasser@arm.com * 58710393Swendy.elsasser@arm.com * @param queue Queued requests to consider 58810890Swendy.elsasser@arm.com * @param extra_col_delay Any extra delay due to a read/write switch 58910618SOmar.Naji@arm.com * @return true if a packet is scheduled to a rank which is available else 59010618SOmar.Naji@arm.com * false 5919974SN/A */ 59210890Swendy.elsasser@arm.com bool reorderQueue(std::deque<DRAMPacket*>& queue, Tick extra_col_delay); 5939974SN/A 5949974SN/A /** 59510211Sandreas.hansson@arm.com * Find which are the earliest banks ready to issue an activate 59610211Sandreas.hansson@arm.com * for the enqueued requests. Assumes maximum of 64 banks per DIMM 59710393Swendy.elsasser@arm.com * Also checks if the bank is already prepped. 5989967SN/A * 59910393Swendy.elsasser@arm.com * @param queue Queued requests to consider 60010890Swendy.elsasser@arm.com * @param time of seamless burst command 6019967SN/A * @return One-hot encoded mask of bank indices 60210890Swendy.elsasser@arm.com * @return boolean indicating burst can issue seamlessly, with no gaps 6039967SN/A */ 60410890Swendy.elsasser@arm.com std::pair<uint64_t, bool> minBankPrep(const std::deque<DRAMPacket*>& queue, 60510890Swendy.elsasser@arm.com Tick min_col_at) const; 6069488SN/A 6079488SN/A /** 6089488SN/A * Keep track of when row activations happen, in order to enforce 6099488SN/A * the maximum number of activations in the activation window. The 6109488SN/A * method updates the time that the banks become available based 6119488SN/A * on the current limits. 61210210Sandreas.hansson@arm.com * 61310618SOmar.Naji@arm.com * @param rank_ref Reference to the rank 61410618SOmar.Naji@arm.com * @param bank_ref Reference to the bank 61510210Sandreas.hansson@arm.com * @param act_tick Time when the activation takes place 61610210Sandreas.hansson@arm.com * @param row Index of the row 6179488SN/A */ 61810618SOmar.Naji@arm.com void activateBank(Rank& rank_ref, Bank& bank_ref, Tick act_tick, 61910618SOmar.Naji@arm.com uint32_t row); 62010207Sandreas.hansson@arm.com 62110207Sandreas.hansson@arm.com /** 62210207Sandreas.hansson@arm.com * Precharge a given bank and also update when the precharge is 62310207Sandreas.hansson@arm.com * done. This will also deal with any stats related to the 62410207Sandreas.hansson@arm.com * accesses to the open page. 62510207Sandreas.hansson@arm.com * 62610618SOmar.Naji@arm.com * @param rank_ref The rank to precharge 62710247Sandreas.hansson@arm.com * @param bank_ref The bank to precharge 62810211Sandreas.hansson@arm.com * @param pre_at Time when the precharge takes place 62910247Sandreas.hansson@arm.com * @param trace Is this an auto precharge then do not add to trace 63010207Sandreas.hansson@arm.com */ 63110618SOmar.Naji@arm.com void prechargeBank(Rank& rank_ref, Bank& bank_ref, 63210618SOmar.Naji@arm.com Tick pre_at, bool trace = true); 6339488SN/A 63410143SN/A /** 63510143SN/A * Used for debugging to observe the contents of the queues. 63610143SN/A */ 6379243SN/A void printQs() const; 6389243SN/A 6399243SN/A /** 64010889Sandreas.hansson@arm.com * Burst-align an address. 64110889Sandreas.hansson@arm.com * 64210889Sandreas.hansson@arm.com * @param addr The potentially unaligned address 64310889Sandreas.hansson@arm.com * 64410889Sandreas.hansson@arm.com * @return An address aligned to a DRAM burst 64510889Sandreas.hansson@arm.com */ 64610889Sandreas.hansson@arm.com Addr burstAlign(Addr addr) const { return (addr & ~(Addr(burstSize - 1))); } 64710889Sandreas.hansson@arm.com 64810889Sandreas.hansson@arm.com /** 6499243SN/A * The controller's main read and write queues 6509243SN/A */ 6519833SN/A std::deque<DRAMPacket*> readQueue; 6529833SN/A std::deque<DRAMPacket*> writeQueue; 6539243SN/A 6549243SN/A /** 65510889Sandreas.hansson@arm.com * To avoid iterating over the write queue to check for 65610889Sandreas.hansson@arm.com * overlapping transactions, maintain a set of burst addresses 65710889Sandreas.hansson@arm.com * that are currently queued. Since we merge writes to the same 65810889Sandreas.hansson@arm.com * location we never have more than one address to the same burst 65910889Sandreas.hansson@arm.com * address. 66010889Sandreas.hansson@arm.com */ 66110889Sandreas.hansson@arm.com std::unordered_set<Addr> isInWriteQueue; 66210889Sandreas.hansson@arm.com 66310889Sandreas.hansson@arm.com /** 6649243SN/A * Response queue where read packets wait after we're done working 6659567SN/A * with them, but it's not time to send the response yet. The 6669567SN/A * responses are stored seperately mostly to keep the code clean 6679567SN/A * and help with events scheduling. For all logical purposes such 6689567SN/A * as sizing the read queue, this and the main read queue need to 6699567SN/A * be added together. 6709243SN/A */ 6719833SN/A std::deque<DRAMPacket*> respQueue; 6729243SN/A 6739567SN/A /** 67410618SOmar.Naji@arm.com * Vector of ranks 6759243SN/A */ 67610618SOmar.Naji@arm.com std::vector<Rank*> ranks; 6779243SN/A 6789243SN/A /** 6799243SN/A * The following are basic design parameters of the memory 6809831SN/A * controller, and are initialized based on parameter values. 6819831SN/A * The rowsPerBank is determined based on the capacity, number of 6829831SN/A * ranks and banks, the burst size, and the row buffer size. 6839243SN/A */ 68410489SOmar.Naji@arm.com const uint32_t deviceSize; 6859831SN/A const uint32_t deviceBusWidth; 6869831SN/A const uint32_t burstLength; 6879831SN/A const uint32_t deviceRowBufferSize; 6889831SN/A const uint32_t devicesPerRank; 6899831SN/A const uint32_t burstSize; 6909831SN/A const uint32_t rowBufferSize; 69110140SN/A const uint32_t columnsPerRowBuffer; 69210286Sandreas.hansson@arm.com const uint32_t columnsPerStripe; 6939243SN/A const uint32_t ranksPerChannel; 69410394Swendy.elsasser@arm.com const uint32_t bankGroupsPerRank; 69510394Swendy.elsasser@arm.com const bool bankGroupArch; 6969243SN/A const uint32_t banksPerRank; 6979566SN/A const uint32_t channels; 6989243SN/A uint32_t rowsPerBank; 6999243SN/A const uint32_t readBufferSize; 7009243SN/A const uint32_t writeBufferSize; 70110140SN/A const uint32_t writeHighThreshold; 70210140SN/A const uint32_t writeLowThreshold; 70310140SN/A const uint32_t minWritesPerSwitch; 70410140SN/A uint32_t writesThisTime; 70510147Sandreas.hansson@arm.com uint32_t readsThisTime; 7069243SN/A 7079243SN/A /** 7089243SN/A * Basic memory timing parameters initialized based on parameter 7099243SN/A * values. 7109243SN/A */ 71110286Sandreas.hansson@arm.com const Tick M5_CLASS_VAR_USED tCK; 7129243SN/A const Tick tWTR; 71310206Sandreas.hansson@arm.com const Tick tRTW; 71410393Swendy.elsasser@arm.com const Tick tCS; 7159243SN/A const Tick tBURST; 71610394Swendy.elsasser@arm.com const Tick tCCD_L; 7179243SN/A const Tick tRCD; 7189243SN/A const Tick tCL; 7199243SN/A const Tick tRP; 7209963SN/A const Tick tRAS; 72110210Sandreas.hansson@arm.com const Tick tWR; 72210212Sandreas.hansson@arm.com const Tick tRTP; 7239243SN/A const Tick tRFC; 7249243SN/A const Tick tREFI; 7259971SN/A const Tick tRRD; 72610394Swendy.elsasser@arm.com const Tick tRRD_L; 7279488SN/A const Tick tXAW; 7289488SN/A const uint32_t activationLimit; 7299243SN/A 7309243SN/A /** 7319243SN/A * Memory controller configuration initialized based on parameter 7329243SN/A * values. 7339243SN/A */ 7349243SN/A Enums::MemSched memSchedPolicy; 7359243SN/A Enums::AddrMap addrMapping; 7369243SN/A Enums::PageManage pageMgmt; 7379243SN/A 7389243SN/A /** 73910141SN/A * Max column accesses (read and write) per row, before forefully 74010141SN/A * closing it. 74110141SN/A */ 74210141SN/A const uint32_t maxAccessesPerRow; 74310141SN/A 74410141SN/A /** 7459726SN/A * Pipeline latency of the controller frontend. The frontend 7469726SN/A * contribution is added to writes (that complete when they are in 7479726SN/A * the write buffer) and reads that are serviced the write buffer. 7489726SN/A */ 7499726SN/A const Tick frontendLatency; 7509726SN/A 7519726SN/A /** 7529726SN/A * Pipeline latency of the backend and PHY. Along with the 7539726SN/A * frontend contribution, this latency is added to reads serviced 7549726SN/A * by the DRAM. 7559726SN/A */ 7569726SN/A const Tick backendLatency; 7579726SN/A 7589726SN/A /** 7599243SN/A * Till when has the main data bus been spoken for already? 7609243SN/A */ 7619243SN/A Tick busBusyUntil; 7629243SN/A 7639243SN/A Tick prevArrival; 7649243SN/A 76510206Sandreas.hansson@arm.com /** 76610206Sandreas.hansson@arm.com * The soonest you have to start thinking about the next request 76710206Sandreas.hansson@arm.com * is the longest access time that can occur before 76810206Sandreas.hansson@arm.com * busBusyUntil. Assuming you need to precharge, open a new row, 76910206Sandreas.hansson@arm.com * and access, it is tRP + tRCD + tCL. 77010206Sandreas.hansson@arm.com */ 77110206Sandreas.hansson@arm.com Tick nextReqTime; 7729972SN/A 7739243SN/A // All statistics that the model needs to capture 7749243SN/A Stats::Scalar readReqs; 7759243SN/A Stats::Scalar writeReqs; 7769831SN/A Stats::Scalar readBursts; 7779831SN/A Stats::Scalar writeBursts; 7789975SN/A Stats::Scalar bytesReadDRAM; 7799975SN/A Stats::Scalar bytesReadWrQ; 7809243SN/A Stats::Scalar bytesWritten; 7819977SN/A Stats::Scalar bytesReadSys; 7829977SN/A Stats::Scalar bytesWrittenSys; 7839243SN/A Stats::Scalar servicedByWrQ; 7849977SN/A Stats::Scalar mergedWrBursts; 7859243SN/A Stats::Scalar neitherReadNorWrite; 7869977SN/A Stats::Vector perBankRdBursts; 7879977SN/A Stats::Vector perBankWrBursts; 7889243SN/A Stats::Scalar numRdRetry; 7899243SN/A Stats::Scalar numWrRetry; 7909243SN/A Stats::Scalar totGap; 7919243SN/A Stats::Vector readPktSize; 7929243SN/A Stats::Vector writePktSize; 7939243SN/A Stats::Vector rdQLenPdf; 7949243SN/A Stats::Vector wrQLenPdf; 7959727SN/A Stats::Histogram bytesPerActivate; 79610147Sandreas.hansson@arm.com Stats::Histogram rdPerTurnAround; 79710147Sandreas.hansson@arm.com Stats::Histogram wrPerTurnAround; 7989243SN/A 7999243SN/A // Latencies summed over all requests 8009243SN/A Stats::Scalar totQLat; 8019243SN/A Stats::Scalar totMemAccLat; 8029243SN/A Stats::Scalar totBusLat; 8039243SN/A 8049243SN/A // Average latencies per request 8059243SN/A Stats::Formula avgQLat; 8069243SN/A Stats::Formula avgBusLat; 8079243SN/A Stats::Formula avgMemAccLat; 8089243SN/A 8099243SN/A // Average bandwidth 8109243SN/A Stats::Formula avgRdBW; 8119243SN/A Stats::Formula avgWrBW; 8129977SN/A Stats::Formula avgRdBWSys; 8139977SN/A Stats::Formula avgWrBWSys; 8149243SN/A Stats::Formula peakBW; 8159243SN/A Stats::Formula busUtil; 8169975SN/A Stats::Formula busUtilRead; 8179975SN/A Stats::Formula busUtilWrite; 8189243SN/A 8199243SN/A // Average queue lengths 8209243SN/A Stats::Average avgRdQLen; 8219243SN/A Stats::Average avgWrQLen; 8229243SN/A 8239243SN/A // Row hit count and rate 8249243SN/A Stats::Scalar readRowHits; 8259243SN/A Stats::Scalar writeRowHits; 8269243SN/A Stats::Formula readRowHitRate; 8279243SN/A Stats::Formula writeRowHitRate; 8289243SN/A Stats::Formula avgGap; 8299243SN/A 8309975SN/A // DRAM Power Calculation 8319975SN/A Stats::Formula pageHitRate; 8329975SN/A 83310393Swendy.elsasser@arm.com // Holds the value of the rank of burst issued 83410393Swendy.elsasser@arm.com uint8_t activeRank; 83510393Swendy.elsasser@arm.com 83610432SOmar.Naji@arm.com // timestamp offset 83710432SOmar.Naji@arm.com uint64_t timeStampOffset; 83810432SOmar.Naji@arm.com 8399349SN/A /** @todo this is a temporary workaround until the 4-phase code is 8409349SN/A * committed. upstream caches needs this packet until true is returned, so 8419349SN/A * hold onto it for deletion until a subsequent call 8429349SN/A */ 8439349SN/A std::vector<PacketPtr> pendingDelete; 8449349SN/A 84510432SOmar.Naji@arm.com /** 84610618SOmar.Naji@arm.com * This function increments the energy when called. If stats are 84710618SOmar.Naji@arm.com * dumped periodically, note accumulated energy values will 84810618SOmar.Naji@arm.com * appear in the stats (even if the stats are reset). This is a 84910618SOmar.Naji@arm.com * result of the energy values coming from DRAMPower, and there 85010618SOmar.Naji@arm.com * is currently no support for resetting the state. 85110618SOmar.Naji@arm.com * 85210618SOmar.Naji@arm.com * @param rank Currrent rank 85310618SOmar.Naji@arm.com */ 85410618SOmar.Naji@arm.com void updatePowerStats(Rank& rank_ref); 85510432SOmar.Naji@arm.com 85610432SOmar.Naji@arm.com /** 85710432SOmar.Naji@arm.com * Function for sorting commands in the command list of DRAMPower. 85810432SOmar.Naji@arm.com * 85910432SOmar.Naji@arm.com * @param a Memory Command in command list of DRAMPower library 86010432SOmar.Naji@arm.com * @param next Memory Command in command list of DRAMPower 86110432SOmar.Naji@arm.com * @return true if timestamp of Command 1 < timestamp of Command 2 86210432SOmar.Naji@arm.com */ 86310432SOmar.Naji@arm.com static bool sortTime(const Data::MemCommand& m1, 86410432SOmar.Naji@arm.com const Data::MemCommand& m2) { 86510432SOmar.Naji@arm.com return m1.getTime() < m2.getTime(); 86610432SOmar.Naji@arm.com }; 86710432SOmar.Naji@arm.com 86810432SOmar.Naji@arm.com 8699243SN/A public: 8709243SN/A 8719243SN/A void regStats(); 8729243SN/A 87310146Sandreas.hansson@arm.com DRAMCtrl(const DRAMCtrlParams* p); 8749243SN/A 87511168Sandreas.hansson@arm.com DrainState drain() override; 8769243SN/A 8779294SN/A virtual BaseSlavePort& getSlavePort(const std::string& if_name, 8789294SN/A PortID idx = InvalidPortID); 8799243SN/A 88011168Sandreas.hansson@arm.com virtual void init() override; 88111168Sandreas.hansson@arm.com virtual void startup() override; 88211168Sandreas.hansson@arm.com virtual void drainResume() override; 8839243SN/A 8849243SN/A protected: 8859243SN/A 8869243SN/A Tick recvAtomic(PacketPtr pkt); 8879243SN/A void recvFunctional(PacketPtr pkt); 8889243SN/A bool recvTimingReq(PacketPtr pkt); 8899243SN/A 8909243SN/A}; 8919243SN/A 89210146Sandreas.hansson@arm.com#endif //__MEM_DRAM_CTRL_HH__ 893