gem5  v21.1.0.2
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gem5::o3::FUPool Class Reference

Pool of FU's, specific to the new CPU model. More...

#include <fu_pool.hh>

Inheritance diagram for gem5::o3::FUPool:
gem5::SimObject gem5::EventManager gem5::Serializable gem5::Drainable gem5::statistics::Group gem5::Named

Classes

class  FUIdxQueue
 Class that implements a circular queue to hold FU indices. More...
 

Public Types

typedef FUPoolParams Params
 
- Public Types inherited from gem5::SimObject
typedef SimObjectParams Params
 

Public Member Functions

 FUPool (const Params &p)
 Constructs a FU pool. More...
 
 ~FUPool ()
 
int getUnit (OpClass capability)
 Gets a FU providing the requested capability. More...
 
void freeUnitNextCycle (int fu_idx)
 Frees a FU at the end of this cycle. More...
 
void processFreeUnits ()
 Frees all FUs on the list. More...
 
int size ()
 Returns the total number of FUs. More...
 
void dump ()
 Debugging function used to dump FU information. More...
 
Cycles getOpLatency (OpClass capability)
 Returns the operation execution latency of the given capability. More...
 
bool isPipelined (OpClass capability)
 Returns the issue latency of the given capability. More...
 
bool isDrained () const
 Have all the FUs drained? More...
 
void takeOverFrom ()
 Takes over from another CPU's thread. 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 PortgetPort (const std::string &if_name, PortID idx=InvalidPortID)
 Get a port with a given name and index. 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 regStats ()
 Callback to set stat parameters. More...
 
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
 

Static Public Attributes

static constexpr auto NoCapableFU = -2
 
static constexpr auto NoFreeFU = -1
 

Private Types

typedef std::vector< FuncUnit * >::iterator fuListIterator
 

Private Attributes

std::array< Cycles, Num_OpClassesmaxOpLatencies
 Maximum op execution latencies, per op class. More...
 
std::array< bool, Num_OpClassespipelined
 Whether op is pipelined or not. More...
 
std::bitset< Num_OpClassescapabilityList
 Bitvector listing capabilities of this FU pool. More...
 
std::vector< bool > unitBusy
 Bitvector listing which FUs are busy. More...
 
std::vector< int > unitsToBeFreed
 List of units to be freed at the end of this cycle. More...
 
FUIdxQueue fuPerCapList [Num_OpClasses]
 Per op class queues of FUs that provide that capability. More...
 
int numFU
 Number of FUs. More...
 
std::vector< FuncUnit * > funcUnits
 Functional units. More...
 

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 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

Pool of FU's, specific to the new CPU model.

The old FU pool had lists of free units and busy units, and whenever a FU was needed it would iterate through the free units to find a FU that provided the capability. This pool has lists of units specific to each of the capabilities, and whenever a FU is needed, it iterates through that list to find a free unit. The previous FU pool would have to be ticked each cycle to update which units became free. This FU pool lets the IEW stage handle freeing units, which frees them as their scheduled execution events complete. This limits units in this model to either have identical issue and op latencies, or 1 cycle issue latencies.

Definition at line 75 of file fu_pool.hh.

Member Typedef Documentation

◆ fuListIterator

Definition at line 134 of file fu_pool.hh.

◆ Params

typedef FUPoolParams gem5::o3::FUPool::Params

Definition at line 137 of file fu_pool.hh.

Constructor & Destructor Documentation

◆ FUPool()

gem5::o3::FUPool::FUPool ( const Params p)

◆ ~FUPool()

gem5::o3::FUPool::~FUPool ( )

Definition at line 76 of file fu_pool.cc.

References funcUnits, and gem5::ArmISA::i.

Member Function Documentation

◆ dump()

void gem5::o3::FUPool::dump ( )

Debugging function used to dump FU information.

Definition at line 210 of file fu_pool.cc.

References funcUnits, gem5::ArmISA::i, gem5::Named::name(), numFU, and unitBusy.

◆ freeUnitNextCycle()

void gem5::o3::FUPool::freeUnitNextCycle ( int  fu_idx)

Frees a FU at the end of this cycle.

Definition at line 190 of file fu_pool.cc.

References unitBusy, and unitsToBeFreed.

Referenced by gem5::o3::InstructionQueue::processFUCompletion(), and gem5::o3::InstructionQueue::scheduleReadyInsts().

◆ getOpLatency()

Cycles gem5::o3::FUPool::getOpLatency ( OpClass  capability)
inline

Returns the operation execution latency of the given capability.

Definition at line 169 of file fu_pool.hh.

References maxOpLatencies.

Referenced by gem5::o3::InstructionQueue::scheduleReadyInsts().

◆ getUnit()

int gem5::o3::FUPool::getUnit ( OpClass  capability)

Gets a FU providing the requested capability.

Will mark the unit as busy, but leaves the freeing of the unit up to the IEW stage.

Parameters
capabilityThe capability requested.
Returns
Returns NoCapableFU if the FU pool does not have the capability, NoFreeFU if there is no free FU, and the FU's index otherwise.

Definition at line 162 of file fu_pool.cc.

References capabilityList, fuPerCapList, gem5::o3::FUPool::FUIdxQueue::getFU(), numFU, and unitBusy.

Referenced by gem5::o3::InstructionQueue::scheduleReadyInsts().

◆ isDrained()

bool gem5::o3::FUPool::isDrained ( ) const

Have all the FUs drained?

Definition at line 244 of file fu_pool.cc.

References gem5::ArmISA::i, numFU, and unitBusy.

Referenced by gem5::o3::IEW::isDrained().

◆ isPipelined()

bool gem5::o3::FUPool::isPipelined ( OpClass  capability)
inline

Returns the issue latency of the given capability.

Definition at line 174 of file fu_pool.hh.

References pipelined.

Referenced by gem5::o3::InstructionQueue::scheduleReadyInsts().

◆ processFreeUnits()

void gem5::o3::FUPool::processFreeUnits ( )

Frees all FUs on the list.

Definition at line 197 of file fu_pool.cc.

References unitBusy, and unitsToBeFreed.

Referenced by gem5::o3::IEW::tick().

◆ size()

int gem5::o3::FUPool::size ( )
inline

Returns the total number of FUs.

Definition at line 163 of file fu_pool.hh.

References numFU.

Referenced by gem5::o3::FUPool::FUIdxQueue::getFU().

◆ takeOverFrom()

void gem5::o3::FUPool::takeOverFrom ( )
inline

Takes over from another CPU's thread.

Definition at line 182 of file fu_pool.hh.

Referenced by gem5::o3::IEW::takeOverFrom().

Member Data Documentation

◆ capabilityList

std::bitset<Num_OpClasses> gem5::o3::FUPool::capabilityList
private

Bitvector listing capabilities of this FU pool.

Definition at line 84 of file fu_pool.hh.

Referenced by FUPool(), and getUnit().

◆ funcUnits

std::vector<FuncUnit *> gem5::o3::FUPool::funcUnits
private

Functional units.

Definition at line 132 of file fu_pool.hh.

Referenced by dump(), FUPool(), and ~FUPool().

◆ fuPerCapList

FUIdxQueue gem5::o3::FUPool::fuPerCapList[Num_OpClasses]
private

Per op class queues of FUs that provide that capability.

Definition at line 126 of file fu_pool.hh.

Referenced by FUPool(), and getUnit().

◆ maxOpLatencies

std::array<Cycles, Num_OpClasses> gem5::o3::FUPool::maxOpLatencies
private

Maximum op execution latencies, per op class.

Definition at line 79 of file fu_pool.hh.

Referenced by FUPool(), and getOpLatency().

◆ NoCapableFU

constexpr auto gem5::o3::FUPool::NoCapableFU = -2
staticconstexpr

Definition at line 142 of file fu_pool.hh.

Referenced by gem5::o3::InstructionQueue::scheduleReadyInsts().

◆ NoFreeFU

constexpr auto gem5::o3::FUPool::NoFreeFU = -1
staticconstexpr

Definition at line 143 of file fu_pool.hh.

Referenced by gem5::o3::InstructionQueue::scheduleReadyInsts().

◆ numFU

int gem5::o3::FUPool::numFU
private

Number of FUs.

Definition at line 129 of file fu_pool.hh.

Referenced by dump(), FUPool(), getUnit(), isDrained(), and size().

◆ pipelined

std::array<bool, Num_OpClasses> gem5::o3::FUPool::pipelined
private

Whether op is pipelined or not.

Definition at line 81 of file fu_pool.hh.

Referenced by FUPool(), and isPipelined().

◆ unitBusy

std::vector<bool> gem5::o3::FUPool::unitBusy
private

Bitvector listing which FUs are busy.

Definition at line 87 of file fu_pool.hh.

Referenced by dump(), freeUnitNextCycle(), FUPool(), getUnit(), isDrained(), and processFreeUnits().

◆ unitsToBeFreed

std::vector<int> gem5::o3::FUPool::unitsToBeFreed
private

List of units to be freed at the end of this cycle.

Definition at line 90 of file fu_pool.hh.

Referenced by freeUnitNextCycle(), and processFreeUnits().


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

Generated on Tue Sep 21 2021 12:31:45 for gem5 by doxygen 1.8.17