DRAM specific generator is for issuing request with variable page hit length and bank utilization. More...

#include <dram_gen.hh>

Inheritance diagram for gem5::DramGen:

Public Member Functions
	DramGen (SimObject &obj, RequestorID requestor_id, Tick _duration, Addr start_addr, Addr end_addr, Addr _blocksize, Addr cacheline_size, Tick min_period, Tick max_period, uint8_t read_percent, Addr data_limit, unsigned int num_seq_pkts, unsigned int page_size, unsigned int nbr_of_banks_DRAM, unsigned int nbr_of_banks_util, enums::AddrMap addr_mapping, unsigned int nbr_of_ranks)
	Create a DRAM address sequence generator.

PacketPtr	getNextPacket ()
	Get the next generated packet.

void	genStartAddr (unsigned int new_bank, unsigned int new_rank)
	Insert bank, rank, and column bits into packed address to create address for 1st command in a series.

Public Member Functions inherited from gem5::RandomGen
	RandomGen (SimObject &obj, RequestorID requestor_id, Tick _duration, Addr start_addr, Addr end_addr, Addr _blocksize, Addr cacheline_size, Tick min_period, Tick max_period, uint8_t read_percent, Addr data_limit)
	Create a random address sequence generator.

void	enter ()
	Enter this generator state.

PacketPtr	getNextPacket ()
	Get the next generated packet.

Tick	nextPacketTick (bool elastic, Tick delay) const
	Determine the tick when the next packet is available.

Public Member Functions inherited from gem5::StochasticGen
	StochasticGen (SimObject &obj, RequestorID requestor_id, Tick _duration, Addr start_addr, Addr end_addr, Addr _blocksize, Addr cacheline_size, Tick min_period, Tick max_period, uint8_t read_percent, Addr data_limit)

Public Member Functions inherited from gem5::BaseGen
	BaseGen (SimObject &obj, RequestorID requestor_id, Tick _duration)
	Create a base generator.

virtual	~BaseGen ()

std::string	name () const
	Get the name, useful for DPRINTFs.

virtual void	exit ()
	Exit this generator state.

Protected Attributes
const unsigned int	numSeqPkts
	Number of sequential DRAM packets to be generated per cpu request.

unsigned int	countNumSeqPkts
	Track number of sequential packets generated for a request

Addr	addr
	Address of request.

bool	isRead
	Remember type of requests to be generated in series.

const unsigned int	pageSize
	Page size of DRAM.

const unsigned int	pageBits
	Number of page bits in DRAM address.

const unsigned int	bankBits
	Number of bank bits in DRAM address.

const unsigned int	blockBits
	Number of block bits in DRAM address.

const unsigned int	nbrOfBanksDRAM
	Number of banks in DRAM.

const unsigned int	nbrOfBanksUtil
	Number of banks to be utilized for a given configuration.

enums::AddrMap	addrMapping
	Address mapping to be used.

const unsigned int	rankBits
	Number of rank bits in DRAM address.

const unsigned int	nbrOfRanks
	Number of ranks to be utilized for a given configuration.

Protected Attributes inherited from gem5::RandomGen
Addr	dataManipulated
	Counter to determine the amount of data manipulated.

Protected Attributes inherited from gem5::StochasticGen
const Addr	startAddr
	Start of address range.

const Addr	endAddr
	End of address range.

const Addr	blocksize
	Blocksize and address increment.

const Addr	cacheLineSize
	Cache line size in the simulated system.

const Tick	minPeriod
	Request generation period.

const Tick	maxPeriod

const uint8_t	readPercent
	Percent of generated transactions that should be reads.

const Addr	dataLimit
	Maximum amount of data to manipulate.

Protected Attributes inherited from gem5::BaseGen
const std::string	_name
	Name to use for status and debug printing.

const RequestorID	requestorId
	The RequestorID used for generating requests.

Additional Inherited Members
Public Attributes inherited from gem5::BaseGen
const Tick	duration
	Time to spend in this state.

Protected Member Functions inherited from gem5::BaseGen
PacketPtr	getPacket (Addr addr, unsigned size, const MemCmd &cmd, Request::FlagsType flags=0)
	Generate a new request and associated packet.

Detailed Description

DRAM specific generator is for issuing request with variable page hit length and bank utilization.

Currently assumes a single channel configuration.

Definition at line 61 of file dram_gen.hh.

Constructor & Destructor Documentation

◆ DramGen()

gem5::DramGen::DramGen	(	SimObject &	obj,
		RequestorID	requestor_id,
		Tick	_duration,
		Addr	start_addr,
		Addr	end_addr,
		Addr	_blocksize,
		Addr	cacheline_size,
		Tick	min_period,
		Tick	max_period,
		uint8_t	read_percent,
		Addr	data_limit,
		unsigned int	num_seq_pkts,
		unsigned int	page_size,
		unsigned int	nbr_of_banks_DRAM,
		unsigned int	nbr_of_banks_util,
		enums::AddrMap	addr_mapping,
		unsigned int	nbr_of_ranks )

Create a DRAM address sequence generator.

Parameters

obj	SimObject owning this sequence generator
requestor_id	RequestorID related to the memory requests
_duration	duration of this state before transitioning
start_addr	Start address
end_addr	End address
_blocksize	Size used for transactions injected
cacheline_size	cache line size in the system
min_period	Lower limit of random inter-transaction time
max_period	Upper limit of random inter-transaction time
read_percent	Percent of transactions that are reads
data_limit	Upper limit on how much data to read/write
num_seq_pkts	Number of packets per stride, each of _blocksize
page_size	Page size (bytes) used in the DRAM
nbr_of_banks_DRAM	Total number of banks in DRAM
nbr_of_banks_util	Number of banks to utilized, for N banks, we will use banks: 0->(N-1)
addr_mapping	Address mapping to be used, assumes single channel system

Definition at line 50 of file dram_gen.cc.

References fatal.

Member Function Documentation

◆ genStartAddr()

void gem5::DramGen::genStartAddr	(	unsigned int	new_bank,
		unsigned int	new_rank )

Insert bank, rank, and column bits into packed address to create address for 1st command in a series.

Parameters

new_bank	Bank number of next packet series
new_rank	Rank value of next packet series

Definition at line 146 of file dram_gen.cc.

References addr, addrMapping, bankBits, blockBits, gem5::StochasticGen::blocksize, gem5::StochasticGen::endAddr, numSeqPkts, pageBits, pageSize, gem5::Random::random(), gem5::random_mt, rankBits, gem5::replaceBits(), and gem5::StochasticGen::startAddr.

Referenced by getNextPacket(), and gem5::DramRotGen::getNextPacket().

◆ getNextPacket()

PacketPtr gem5::DramGen::getNextPacket ( )

virtual

Get the next generated packet.

Returns: A packet to be sent at the current tick

Implements gem5::BaseGen.

Reimplemented in gem5::DramRotGen.

Definition at line 81 of file dram_gen.cc.

References addr, addrMapping, bankBits, blockBits, gem5::StochasticGen::blocksize, countNumSeqPkts, gem5::RandomGen::dataManipulated, DPRINTF, genStartAddr(), gem5::BaseGen::getPacket(), isRead, nbrOfBanksDRAM, nbrOfBanksUtil, nbrOfRanks, numSeqPkts, pageBits, pageSize, gem5::Random::random(), gem5::random_mt, rankBits, gem5::StochasticGen::readPercent, gem5::MemCmd::ReadReq, gem5::replaceBits(), and gem5::MemCmd::WriteReq.

Member Data Documentation

◆ addr

Addr gem5::DramGen::addr

protected

Address of request.

Definition at line 118 of file dram_gen.hh.

Referenced by genStartAddr(), getNextPacket(), and gem5::DramRotGen::getNextPacket().

◆ addrMapping

enums::AddrMap gem5::DramGen::addrMapping

protected

Address mapping to be used.

Definition at line 142 of file dram_gen.hh.

Referenced by genStartAddr(), getNextPacket(), and gem5::DramRotGen::getNextPacket().

◆ bankBits

const unsigned int gem5::DramGen::bankBits

protected

Number of bank bits in DRAM address.

Definition at line 130 of file dram_gen.hh.

Referenced by genStartAddr(), getNextPacket(), and gem5::DramRotGen::getNextPacket().

◆ blockBits

const unsigned int gem5::DramGen::blockBits

protected

Number of block bits in DRAM address.

Definition at line 133 of file dram_gen.hh.

Referenced by genStartAddr(), getNextPacket(), and gem5::DramRotGen::getNextPacket().

◆ countNumSeqPkts

unsigned int gem5::DramGen::countNumSeqPkts

protected

Track number of sequential packets generated for a request

Definition at line 115 of file dram_gen.hh.

Referenced by getNextPacket(), and gem5::DramRotGen::getNextPacket().

◆ isRead

bool gem5::DramGen::isRead

protected

Remember type of requests to be generated in series.

Definition at line 121 of file dram_gen.hh.

Referenced by getNextPacket(), and gem5::DramRotGen::getNextPacket().

◆ nbrOfBanksDRAM

const unsigned int gem5::DramGen::nbrOfBanksDRAM

protected

Number of banks in DRAM.

Definition at line 136 of file dram_gen.hh.

Referenced by getNextPacket(), and gem5::DramRotGen::getNextPacket().

◆ nbrOfBanksUtil

const unsigned int gem5::DramGen::nbrOfBanksUtil

protected

Number of banks to be utilized for a given configuration.

Definition at line 139 of file dram_gen.hh.

Referenced by getNextPacket(), and gem5::DramRotGen::getNextPacket().

◆ nbrOfRanks

const unsigned int gem5::DramGen::nbrOfRanks

protected

Number of ranks to be utilized for a given configuration.

Definition at line 148 of file dram_gen.hh.

Referenced by getNextPacket(), and gem5::DramRotGen::getNextPacket().

◆ numSeqPkts

const unsigned int gem5::DramGen::numSeqPkts

protected

Number of sequential DRAM packets to be generated per cpu request.

Definition at line 112 of file dram_gen.hh.

Referenced by genStartAddr(), getNextPacket(), and gem5::DramRotGen::getNextPacket().

◆ pageBits

const unsigned int gem5::DramGen::pageBits

protected

Number of page bits in DRAM address.

Definition at line 127 of file dram_gen.hh.

Referenced by genStartAddr(), getNextPacket(), and gem5::DramRotGen::getNextPacket().

◆ pageSize

const unsigned int gem5::DramGen::pageSize

protected

Page size of DRAM.

Definition at line 124 of file dram_gen.hh.

Referenced by genStartAddr(), getNextPacket(), and gem5::DramRotGen::getNextPacket().

◆ rankBits

const unsigned int gem5::DramGen::rankBits

protected

Number of rank bits in DRAM address.

Definition at line 145 of file dram_gen.hh.

Referenced by genStartAddr(), getNextPacket(), and gem5::DramRotGen::getNextPacket().

The documentation for this class was generated from the following files:

cpu/testers/traffic_gen/dram_gen.hh
cpu/testers/traffic_gen/dram_gen.cc

Public Member Functions

Protected Attributes

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

◆ DramGen()

Member Function Documentation

◆ genStartAddr()

◆ getNextPacket()

Member Data Documentation

◆ addr

◆ addrMapping

◆ bankBits

◆ blockBits

◆ countNumSeqPkts

◆ isRead

◆ nbrOfBanksDRAM

◆ nbrOfBanksUtil

◆ nbrOfRanks

◆ numSeqPkts

◆ pageBits

◆ pageSize

◆ rankBits