gem5  v22.0.0.2
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gem5::VegaTLBCoalescer Class Reference

The VegaTLBCoalescer is a ClockedObject sitting on the front side (CPUSide) of each TLB. More...

#include <tlb_coalescer.hh>

Inheritance diagram for gem5::VegaTLBCoalescer:
gem5::ClockedObject gem5::SimObject gem5::Clocked gem5::EventManager gem5::Serializable gem5::Drainable gem5::statistics::Group gem5::Named

Classes

class  CpuSidePort
 
class  MemSidePort
 

Public Types

typedef std::vector< PacketPtrcoalescedReq
 
typedef std::map< Tick, std::vector< coalescedReq > > CoalescingFIFO
 
typedef std::unordered_map< Addr, coalescedReqCoalescingTable
 
- Public Types inherited from gem5::ClockedObject
using Params = ClockedObjectParams
 Parameters of ClockedObject. More...
 
- Public Types inherited from gem5::SimObject
typedef SimObjectParams Params
 

Public Member Functions

 VegaTLBCoalescer (const VegaTLBCoalescerParams &p)
 
 ~VegaTLBCoalescer ()
 
bool canCoalesce (PacketPtr pkt1, PacketPtr pkt2)
 
void updatePhysAddresses (PacketPtr pkt)
 
void regStats () override
 Callback to set stat parameters. More...
 
PortgetPort (const std::string &if_name, PortID idx=InvalidPortID) override
 Get a port with a given name and index. More...
 
void processProbeTLBEvent ()
 
void processCleanupEvent ()
 
unsigned int availDownstreamSlots ()
 
void insertStalledPortIfNotMapped (CpuSidePort *)
 
bool mustStallCUPort (CpuSidePort *)
 
bool stalledPorts ()
 
void decrementNumDownstream ()
 
void incrementNumDownstream ()
 
void unstallPorts ()
 
- Public Member Functions inherited from gem5::ClockedObject
 ClockedObject (const ClockedObjectParams &p)
 
void serialize (CheckpointOut &cp) const override
 Serialize an object. More...
 
void unserialize (CheckpointIn &cp) override
 Unserialize an object. More...
 
- Public Member Functions inherited from gem5::SimObject
const Paramsparams () const
 
 SimObject (const Params &p)
 
virtual ~SimObject ()
 
virtual void init ()
 init() is called after all C++ SimObjects have been created and all ports are connected. More...
 
virtual void loadState (CheckpointIn &cp)
 loadState() is called on each SimObject when restoring from a checkpoint. More...
 
virtual void initState ()
 initState() is called on each SimObject when not restoring from a checkpoint. More...
 
virtual void regProbePoints ()
 Register probe points for this object. More...
 
virtual void regProbeListeners ()
 Register probe listeners for this object. More...
 
ProbeManagergetProbeManager ()
 Get the probe manager for this object. More...
 
virtual void startup ()
 startup() is the final initialization call before simulation. More...
 
DrainState drain () override
 Provide a default implementation of the drain interface for objects that don't need draining. More...
 
virtual void memWriteback ()
 Write back dirty buffers to memory using functional writes. More...
 
virtual void memInvalidate ()
 Invalidate the contents of memory buffers. More...
 
void serialize (CheckpointOut &cp) const override
 Serialize an object. More...
 
void unserialize (CheckpointIn &cp) override
 Unserialize an object. More...
 
- Public Member Functions inherited from gem5::EventManager
EventQueueeventQueue () const
 
void schedule (Event &event, Tick when)
 
void deschedule (Event &event)
 
void reschedule (Event &event, Tick when, bool always=false)
 
void schedule (Event *event, Tick when)
 
void deschedule (Event *event)
 
void reschedule (Event *event, Tick when, bool always=false)
 
void wakeupEventQueue (Tick when=(Tick) -1)
 This function is not needed by the usual gem5 event loop but may be necessary in derived EventQueues which host gem5 on other schedulers. More...
 
void setCurTick (Tick newVal)
 
 EventManager (EventManager &em)
 Event manger manages events in the event queue. More...
 
 EventManager (EventManager *em)
 
 EventManager (EventQueue *eq)
 
- Public Member Functions inherited from gem5::Serializable
 Serializable ()
 
virtual ~Serializable ()
 
void serializeSection (CheckpointOut &cp, const char *name) const
 Serialize an object into a new section. More...
 
void serializeSection (CheckpointOut &cp, const std::string &name) const
 
void unserializeSection (CheckpointIn &cp, const char *name)
 Unserialize an a child object. More...
 
void unserializeSection (CheckpointIn &cp, const std::string &name)
 
- Public Member Functions inherited from gem5::Drainable
DrainState drainState () const
 Return the current drain state of an object. More...
 
virtual void notifyFork ()
 Notify a child process of a fork. More...
 
- Public Member Functions inherited from gem5::statistics::Group
 Group (Group *parent, const char *name=nullptr)
 Construct a new statistics group. More...
 
virtual ~Group ()
 
virtual void resetStats ()
 Callback to reset stats. More...
 
virtual void preDumpStats ()
 Callback before stats are dumped. More...
 
void addStat (statistics::Info *info)
 Register a stat with this group. More...
 
const std::map< std::string, Group * > & getStatGroups () const
 Get all child groups associated with this object. More...
 
const std::vector< Info * > & getStats () const
 Get all stats associated with this object. More...
 
void addStatGroup (const char *name, Group *block)
 Add a stat block as a child of this block. More...
 
const InforesolveStat (std::string name) const
 Resolve a stat by its name within this group. More...
 
void mergeStatGroup (Group *block)
 Merge the contents (stats & children) of a block to this block. More...
 
 Group ()=delete
 
 Group (const Group &)=delete
 
Groupoperator= (const Group &)=delete
 
- Public Member Functions inherited from gem5::Named
 Named (const std::string &name_)
 
virtual ~Named ()=default
 
virtual std::string name () const
 
- Public Member Functions inherited from gem5::Clocked
void updateClockPeriod ()
 Update the tick to the current tick. More...
 
Tick clockEdge (Cycles cycles=Cycles(0)) const
 Determine the tick when a cycle begins, by default the current one, but the argument also enables the caller to determine a future cycle. More...
 
Cycles curCycle () const
 Determine the current cycle, corresponding to a tick aligned to a clock edge. More...
 
Tick nextCycle () const
 Based on the clock of the object, determine the start tick of the first cycle that is at least one cycle in the future. More...
 
uint64_t frequency () const
 
Tick clockPeriod () const
 
double voltage () const
 
Cycles ticksToCycles (Tick t) const
 
Tick cyclesToTicks (Cycles c) const
 

Public Attributes

int TLBProbesPerCycle
 
int coalescingWindow
 
bool disableCoalescing
 
CoalescingFIFO coalescerFIFO
 
CoalescingTable issuedTranslationsTable
 
statistics::Scalar uncoalescedAccesses
 
statistics::Scalar coalescedAccesses
 
statistics::Scalar queuingCycles
 
statistics::Scalar localqueuingCycles
 
statistics::Scalar localCycles
 
statistics::Formula localLatency
 
statistics::Formula latency
 
std::vector< CpuSidePort * > cpuSidePort
 
std::vector< MemSidePort * > memSidePort
 
EventFunctionWrapper probeTLBEvent
 This event issues the TLB probes. More...
 
EventFunctionWrapper cleanupEvent
 The cleanupEvent is scheduled after a TLBEvent triggers in order to free memory and do the required clean-up. More...
 
int tlb_level
 
int maxDownstream
 
unsigned int numDownstream
 
CpuSidePortstalledPort
 
std::queue< CpuSidePort * > stalledPortsQueue
 
std::map< CpuSidePort *, CpuSidePort * > stalledPortsMap
 
std::queue< AddrcleanupQueue
 
- Public Attributes inherited from gem5::ClockedObject
PowerStatepowerState
 

Additional Inherited Members

- Static Public Member Functions inherited from gem5::SimObject
static void serializeAll (const std::string &cpt_dir)
 Create a checkpoint by serializing all SimObjects in the system. More...
 
static SimObjectfind (const char *name)
 Find the SimObject with the given name and return a pointer to it. More...
 
static void setSimObjectResolver (SimObjectResolver *resolver)
 There is a single object name resolver, and it is only set when simulation is restoring from checkpoints. More...
 
static SimObjectResolvergetSimObjectResolver ()
 There is a single object name resolver, and it is only set when simulation is restoring from checkpoints. More...
 
- Static Public Member Functions inherited from gem5::Serializable
static const std::string & currentSection ()
 Gets the fully-qualified name of the active section. More...
 
static void generateCheckpointOut (const std::string &cpt_dir, std::ofstream &outstream)
 Generate a checkpoint file so that the serialization can be routed to it. More...
 
- Protected Member Functions inherited from gem5::Drainable
 Drainable ()
 
virtual ~Drainable ()
 
virtual void drainResume ()
 Resume execution after a successful drain. More...
 
void signalDrainDone () const
 Signal that an object is drained. More...
 
- Protected Member Functions inherited from gem5::Clocked
 Clocked (ClockDomain &clk_domain)
 Create a clocked object and set the clock domain based on the parameters. More...
 
 Clocked (Clocked &)=delete
 
Clockedoperator= (Clocked &)=delete
 
virtual ~Clocked ()
 Virtual destructor due to inheritance. More...
 
void resetClock () const
 Reset the object's clock using the current global tick value. More...
 
virtual void clockPeriodUpdated ()
 A hook subclasses can implement so they can do any extra work that's needed when the clock rate is changed. More...
 
- Protected Attributes inherited from gem5::SimObject
const SimObjectParams & _params
 Cached copy of the object parameters. More...
 
- Protected Attributes inherited from gem5::EventManager
EventQueueeventq
 A pointer to this object's event queue. More...
 

Detailed Description

The VegaTLBCoalescer is a ClockedObject sitting on the front side (CPUSide) of each TLB.

It receives packets and issues coalesced requests to the TLB below it. It controls how requests are coalesced (the rules) and the permitted number of TLB probes per cycle (i.e., how many coalesced requests it feeds the TLB per cycle).

Definition at line 61 of file tlb_coalescer.hh.

Member Typedef Documentation

◆ coalescedReq

Definition at line 76 of file tlb_coalescer.hh.

◆ CoalescingFIFO

Definition at line 95 of file tlb_coalescer.hh.

◆ CoalescingTable

Definition at line 108 of file tlb_coalescer.hh.

Constructor & Destructor Documentation

◆ VegaTLBCoalescer()

gem5::VegaTLBCoalescer::VegaTLBCoalescer ( const VegaTLBCoalescerParams &  p)

Definition at line 46 of file tlb_coalescer.cc.

References processProbeTLBEvent().

◆ ~VegaTLBCoalescer()

gem5::VegaTLBCoalescer::~VegaTLBCoalescer ( )
inline

Definition at line 65 of file tlb_coalescer.hh.

Member Function Documentation

◆ availDownstreamSlots()

unsigned int gem5::VegaTLBCoalescer::availDownstreamSlots ( )
inline

Definition at line 216 of file tlb_coalescer.hh.

References maxDownstream, numDownstream, and tlb_level.

Referenced by mustStallCUPort(), processProbeTLBEvent(), and unstallPorts().

◆ canCoalesce()

bool gem5::VegaTLBCoalescer::canCoalesce ( PacketPtr  pkt1,
PacketPtr  pkt2 
)

◆ decrementNumDownstream()

void gem5::VegaTLBCoalescer::decrementNumDownstream ( )
inline

Definition at line 229 of file tlb_coalescer.hh.

References numDownstream, and tlb_level.

◆ getPort()

Port & gem5::VegaTLBCoalescer::getPort ( const std::string &  if_name,
PortID  idx = InvalidPortID 
)
overridevirtual

Get a port with a given name and index.

This is used at binding time and returns a reference to a protocol-agnostic port.

gem5 has a request and response port interface. All memory objects are connected together via ports. These ports provide a rigid interface between these memory objects. These ports implement three different memory system modes: timing, atomic, and functional. The most important mode is the timing mode and here timing mode is used for conducting cycle-level timing experiments. The other modes are only used in special circumstances and should not be used to conduct cycle-level timing experiments. The other modes are only used in special circumstances. These ports allow SimObjects to communicate with each other.

Parameters
if_namePort name
idxIndex in the case of a VectorPort
Returns
A reference to the given port

Reimplemented from gem5::SimObject.

Definition at line 75 of file tlb_coalescer.cc.

References cpuSidePort, memSidePort, and panic.

◆ incrementNumDownstream()

void gem5::VegaTLBCoalescer::incrementNumDownstream ( )
inline

Definition at line 235 of file tlb_coalescer.hh.

References maxDownstream, numDownstream, and tlb_level.

Referenced by processProbeTLBEvent().

◆ insertStalledPortIfNotMapped()

void gem5::VegaTLBCoalescer::insertStalledPortIfNotMapped ( CpuSidePort port)

Definition at line 628 of file tlb_coalescer.cc.

References DPRINTF, stalledPortsMap, stalledPortsQueue, and tlb_level.

Referenced by mustStallCUPort().

◆ mustStallCUPort()

bool gem5::VegaTLBCoalescer::mustStallCUPort ( CpuSidePort port)

◆ processCleanupEvent()

void gem5::VegaTLBCoalescer::processCleanupEvent ( )

Definition at line 571 of file tlb_coalescer.cc.

References cleanupQueue, DPRINTF, and issuedTranslationsTable.

◆ processProbeTLBEvent()

void gem5::VegaTLBCoalescer::processProbeTLBEvent ( )

◆ regStats()

void gem5::VegaTLBCoalescer::regStats ( )
overridevirtual

Callback to set stat parameters.

This callback is typically used for complex stats (e.g., distributions) that need parameters in addition to a name and a description. Stat names and descriptions should typically be set from the constructor usingo from the constructor using the ADD_STAT macro.

Reimplemented from gem5::statistics::Group.

Definition at line 584 of file tlb_coalescer.cc.

References coalescedAccesses, gem5::statistics::DataWrap< Derived, InfoProxyType >::desc(), latency, localCycles, localLatency, localqueuingCycles, gem5::Named::name(), gem5::statistics::DataWrap< Derived, InfoProxyType >::name(), queuingCycles, gem5::statistics::Group::regStats(), and uncoalescedAccesses.

◆ stalledPorts()

bool gem5::VegaTLBCoalescer::stalledPorts ( )
inline

Definition at line 224 of file tlb_coalescer.hh.

References stalledPortsQueue, and tlb_level.

Referenced by unstallPorts().

◆ unstallPorts()

void gem5::VegaTLBCoalescer::unstallPorts ( )

◆ updatePhysAddresses()

void gem5::VegaTLBCoalescer::updatePhysAddresses ( PacketPtr  pkt)

Member Data Documentation

◆ cleanupEvent

EventFunctionWrapper gem5::VegaTLBCoalescer::cleanupEvent

The cleanupEvent is scheduled after a TLBEvent triggers in order to free memory and do the required clean-up.

Definition at line 206 of file tlb_coalescer.hh.

Referenced by updatePhysAddresses().

◆ cleanupQueue

std::queue<Addr> gem5::VegaTLBCoalescer::cleanupQueue

Definition at line 246 of file tlb_coalescer.hh.

Referenced by processCleanupEvent(), and updatePhysAddresses().

◆ coalescedAccesses

statistics::Scalar gem5::VegaTLBCoalescer::coalescedAccesses

◆ coalescerFIFO

CoalescingFIFO gem5::VegaTLBCoalescer::coalescerFIFO

◆ coalescingWindow

int gem5::VegaTLBCoalescer::coalescingWindow

Definition at line 72 of file tlb_coalescer.hh.

Referenced by gem5::VegaTLBCoalescer::CpuSidePort::recvTimingReq().

◆ cpuSidePort

std::vector<CpuSidePort*> gem5::VegaTLBCoalescer::cpuSidePort

Definition at line 192 of file tlb_coalescer.hh.

Referenced by getPort().

◆ disableCoalescing

bool gem5::VegaTLBCoalescer::disableCoalescing

Definition at line 79 of file tlb_coalescer.hh.

Referenced by canCoalesce().

◆ issuedTranslationsTable

CoalescingTable gem5::VegaTLBCoalescer::issuedTranslationsTable

◆ latency

statistics::Formula gem5::VegaTLBCoalescer::latency

Definition at line 130 of file tlb_coalescer.hh.

Referenced by regStats().

◆ localCycles

statistics::Scalar gem5::VegaTLBCoalescer::localCycles

◆ localLatency

statistics::Formula gem5::VegaTLBCoalescer::localLatency

Definition at line 128 of file tlb_coalescer.hh.

Referenced by regStats().

◆ localqueuingCycles

statistics::Scalar gem5::VegaTLBCoalescer::localqueuingCycles

◆ maxDownstream

int gem5::VegaTLBCoalescer::maxDownstream

Definition at line 209 of file tlb_coalescer.hh.

Referenced by availDownstreamSlots(), incrementNumDownstream(), and mustStallCUPort().

◆ memSidePort

std::vector<MemSidePort*> gem5::VegaTLBCoalescer::memSidePort

Definition at line 194 of file tlb_coalescer.hh.

Referenced by getPort(), and processProbeTLBEvent().

◆ numDownstream

unsigned int gem5::VegaTLBCoalescer::numDownstream

◆ probeTLBEvent

EventFunctionWrapper gem5::VegaTLBCoalescer::probeTLBEvent

This event issues the TLB probes.

Definition at line 201 of file tlb_coalescer.hh.

Referenced by processProbeTLBEvent(), and gem5::VegaTLBCoalescer::CpuSidePort::recvTimingReq().

◆ queuingCycles

statistics::Scalar gem5::VegaTLBCoalescer::queuingCycles

◆ stalledPort

CpuSidePort* gem5::VegaTLBCoalescer::stalledPort

Definition at line 211 of file tlb_coalescer.hh.

◆ stalledPortsMap

std::map<CpuSidePort *, CpuSidePort *> gem5::VegaTLBCoalescer::stalledPortsMap

Definition at line 214 of file tlb_coalescer.hh.

Referenced by insertStalledPortIfNotMapped(), and unstallPorts().

◆ stalledPortsQueue

std::queue<CpuSidePort *> gem5::VegaTLBCoalescer::stalledPortsQueue

Definition at line 212 of file tlb_coalescer.hh.

Referenced by insertStalledPortIfNotMapped(), stalledPorts(), and unstallPorts().

◆ tlb_level

int gem5::VegaTLBCoalescer::tlb_level

◆ TLBProbesPerCycle

int gem5::VegaTLBCoalescer::TLBProbesPerCycle

Definition at line 68 of file tlb_coalescer.hh.

Referenced by processProbeTLBEvent().

◆ uncoalescedAccesses

statistics::Scalar gem5::VegaTLBCoalescer::uncoalescedAccesses

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

Generated on Thu Jul 28 2022 13:33:17 for gem5 by doxygen 1.8.17