gem5  v22.0.0.1
commit.hh
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40 
41 #ifndef __CPU_O3_COMMIT_HH__
42 #define __CPU_O3_COMMIT_HH__
43 
44 #include <queue>
45 
46 #include "base/statistics.hh"
47 #include "cpu/exetrace.hh"
48 #include "cpu/inst_seq.hh"
49 #include "cpu/o3/comm.hh"
50 #include "cpu/o3/dyn_inst_ptr.hh"
51 #include "cpu/o3/iew.hh"
52 #include "cpu/o3/limits.hh"
53 #include "cpu/o3/rename_map.hh"
54 #include "cpu/o3/rob.hh"
55 #include "cpu/timebuf.hh"
56 #include "enums/CommitPolicy.hh"
57 #include "sim/probe/probe.hh"
58 
59 namespace gem5
60 {
61 
62 struct BaseO3CPUParams;
63 
64 namespace o3
65 {
66 
67 class ThreadState;
68 
91 class Commit
92 {
93  public:
98  {
101  };
102 
105  {
111  SquashAfterPending, //< Committing instructions before a squash.
112  };
113 
114  private:
122  CommitPolicy commitPolicy;
123 
129 
131  void processTrapEvent(ThreadID tid);
132 
133  public:
135  Commit(CPU *_cpu, const BaseO3CPUParams &params);
136 
138  std::string name() const;
139 
141  void regProbePoints();
142 
144  void setThreads(std::vector<ThreadState *> &threads);
145 
148 
150 
153 
155  void setIEWQueue(TimeBuffer<IEWStruct> *iq_ptr);
156 
158  void setIEWStage(IEW *iew_stage);
159 
165 
168 
171 
173  void setROB(ROB *rob_ptr);
174 
176  void startupStage();
177 
179  void clearStates(ThreadID tid);
180 
182  void drain();
183 
185  void drainResume();
186 
188  void drainSanityCheck() const;
189 
191  bool isDrained() const;
192 
194  void takeOverFrom();
195 
197  void deactivateThread(ThreadID tid);
198 
200  bool executingHtmTransaction(ThreadID) const;
201 
202  /* Reset HTM tracking, e.g. after an abort */
204 
206  void tick();
207 
211  void commit();
212 
214  size_t numROBFreeEntries(ThreadID tid);
215 
217  void generateTrapEvent(ThreadID tid, Fault inst_fault);
218 
222  void generateTCEvent(ThreadID tid);
223 
224  private:
228  void updateStatus();
229 
234  bool changedROBEntries();
235 
237  void squashAll(ThreadID tid);
238 
240  void squashFromTrap(ThreadID tid);
241 
243  void squashFromTC(ThreadID tid);
244 
247 
276  void squashAfter(ThreadID tid, const DynInstPtr &head_inst);
277 
279  void handleInterrupt();
280 
282  void propagateInterrupt();
283 
285  void commitInsts();
286 
290  bool commitHead(const DynInstPtr &head_inst, unsigned inst_num);
291 
293  void getInsts();
294 
296  void markCompletedInsts();
297 
300 
303 
306 
307  public:
309  const PCStateBase &pcState(ThreadID tid) { return *pc[tid]; }
310 
312  void pcState(const PCStateBase &val, ThreadID tid) { set(pc[tid], val); }
313 
314  private:
317 
320 
323 
325 
327 
330 
333 
336 
339 
340  public:
343 
344  private:
347 
350 
355 
360 
363 
366 
375 
378 
381 
384 
387 
389 
393  const unsigned renameWidth;
394 
396  const unsigned commitWidth;
397 
400 
405 
412 
417 
420 
424  std::unique_ptr<PCStateBase> pc[MaxThreads];
425 
428 
431 
434 
437 
441 
444 
447 
450 
456 
458  void updateComInstStats(const DynInstPtr &inst);
459 
460  // HTM
463 
465  {
481 
506 
509  } stats;
510 };
511 
512 } // namespace o3
513 } // namespace gem5
514 
515 #endif // __CPU_O3_COMMIT_HH__
gem5::o3::Commit::drainPending
bool drainPending
Is a drain pending? Commit is looking for an instruction boundary while there are no pending interrup...
Definition: commit.hh:404
gem5::statistics::Scalar
This is a simple scalar statistic, like a counter.
Definition: statistics.hh:1930
gem5::o3::Commit::setActiveThreads
void setActiveThreads(std::list< ThreadID > *at_ptr)
Sets pointer to list of active threads.
Definition: commit.cc:299
gem5::o3::Commit::renameMap
UnifiedRenameMap * renameMap[MaxThreads]
Rename map interface.
Definition: commit.hh:446
gem5::o3::Commit::setROB
void setROB(ROB *rob_ptr)
Sets pointer to the ROB.
Definition: commit.cc:311
gem5::o3::Commit::TrapPending
@ TrapPending
Definition: commit.hh:109
gem5::o3::Commit::fetchToCommitDelay
const Cycles fetchToCommitDelay
Definition: commit.hh:388
gem5::o3::Commit::takeOverFrom
void takeOverFrom()
Takes over from another CPU's thread.
Definition: commit.cc:400
gem5::o3::Commit::Commit
Commit(CPU *_cpu, const BaseO3CPUParams &params)
Construct a Commit with the given parameters.
Definition: commit.cc:85
gem5::o3::Commit::CommitStats::instsCommitted
statistics::Vector instsCommitted
Total number of instructions committed.
Definition: commit.hh:483
gem5::o3::Commit::CommitStats::commitEligibleSamples
statistics::Scalar commitEligibleSamples
Number of cycles where the commit bandwidth limit is reached.
Definition: commit.hh:508
gem5::o3::Commit::squashFromTC
void squashFromTC(ThreadID tid)
Handles squashing due to an TC write.
Definition: commit.cc:585
gem5::o3::Commit::regProbePoints
void regProbePoints()
Registers probes.
Definition: commit.cc:139
gem5::o3::Commit::CommitStats::loads
statistics::Vector loads
Stat for the total number of committed loads.
Definition: commit.hh:489
gem5::o3::Commit::renameWidth
const unsigned renameWidth
Rename width, in instructions.
Definition: commit.hh:393
gem5::statistics::Distribution
A simple distribution stat.
Definition: statistics.hh:2084
gem5::o3::Commit::setIEWQueue
void setIEWQueue(TimeBuffer< IEWStruct > *iq_ptr)
Sets the pointer to the queue coming from IEW.
Definition: commit.cc:284
gem5::o3::Commit::CommitStats::numCommittedDist
statistics::Distribution numCommittedDist
Distribution of the number of committed instructions each cycle.
Definition: commit.hh:480
gem5::o3::Commit::drain
void drain()
Initializes the draining of commit.
Definition: commit.cc:348
gem5::o3::Commit::CommitStats::committedInstType
statistics::Vector2d committedInstType
Committed instructions by instruction type (OpClass)
Definition: commit.hh:505
gem5::o3::Commit::renameQueue
TimeBuffer< RenameStruct > * renameQueue
Rename instruction queue interface, for ROB.
Definition: commit.hh:335
gem5::o3::Commit::ppSquash
ProbePointArg< DynInstPtr > * ppSquash
To probe when an instruction is squashed.
Definition: commit.hh:128
gem5::o3::Commit::squashAfterInst
DynInstPtr squashAfterInst[MaxThreads]
Instruction passed to squashAfter().
Definition: commit.hh:374
gem5::o3::Commit::setThreads
void setThreads(std::vector< ThreadState * > &threads)
Sets the list of threads.
Definition: commit.cc:248
gem5::o3::Commit::timeBuffer
TimeBuffer< TimeStruct > * timeBuffer
Time buffer interface.
Definition: commit.hh:316
gem5::o3::Commit::fromIEW
TimeBuffer< IEWStruct >::wire fromIEW
Wire to read information from IEW queue.
Definition: commit.hh:332
gem5::o3::Commit::pcState
const PCStateBase & pcState(ThreadID tid)
Reads the PC of a specific thread.
Definition: commit.hh:309
gem5::o3::Commit::priority_list
std::list< ThreadID > priority_list
Priority List used for Commit Policy.
Definition: commit.hh:377
gem5::ArmISA::set
Bitfield< 12, 11 > set
Definition: misc_types.hh:703
gem5::o3::Commit::wroteToTimeBuffer
bool wroteToTimeBuffer
Records that commit has written to the time buffer this cycle.
Definition: commit.hh:354
gem5::o3::Commit::changedROBEntries
bool changedROBEntries()
Returns if any of the threads have the number of ROB entries changed on this cycle.
Definition: commit.cc:476
gem5::o3::Commit::startupStage
void startupStage()
Initializes stage by sending back the number of free entries.
Definition: commit.cc:314
gem5::X86ISA::val
Bitfield< 63 > val
Definition: misc.hh:769
exetrace.hh
gem5::o3::Commit::setRenameMap
void setRenameMap(UnifiedRenameMap rm_ptr[MaxThreads])
Sets pointer to the commited state rename map.
Definition: commit.cc:305
gem5::statistics::Vector2d
A 2-Dimensional vecto of scalar stats.
Definition: statistics.hh:2058
gem5::o3::Commit::commitInsts
void commitInsts()
Commits as many instructions as possible.
Definition: commit.cc:945
gem5::o3::Commit::ppCommit
ProbePointArg< DynInstPtr > * ppCommit
Probe Points.
Definition: commit.hh:125
gem5::statistics::Vector
A vector of scalar stats.
Definition: statistics.hh:2006
gem5::o3::Commit::CommitStats
Definition: commit.hh:464
std::vector
STL vector class.
Definition: stl.hh:37
gem5::o3::Commit::FetchTrapPending
@ FetchTrapPending
Definition: commit.hh:110
iew.hh
gem5::o3::Commit::ThreadStatus
ThreadStatus
Individual thread status.
Definition: commit.hh:104
gem5::o3::Commit::squashFromSquashAfter
void squashFromSquashAfter(ThreadID tid)
Handles a squash from a squashAfter() request.
Definition: commit.cc:601
gem5::o3::Commit::setRenameQueue
void setRenameQueue(TimeBuffer< RenameStruct > *rq_ptr)
Sets the pointer to the queue coming from rename.
Definition: commit.cc:275
gem5::o3::Commit::CommitStatus
CommitStatus
Overall commit status.
Definition: commit.hh:97
gem5::o3::Commit::committedStores
bool committedStores[MaxThreads]
Records if there were any stores committed this cycle.
Definition: commit.hh:436
gem5::o3::Commit::generateTrapEvent
void generateTrapEvent(ThreadID tid, Fault inst_fault)
Generates an event to schedule a squash due to a trap.
Definition: commit.cc:499
gem5::o3::Commit::deactivateThread
void deactivateThread(ThreadID tid)
Deschedules a thread from scheduling.
Definition: commit.cc:415
rob.hh
gem5::o3::Commit::commitToIEWDelay
const Cycles commitToIEWDelay
Commit to IEW delay.
Definition: commit.hh:383
gem5::RefCountingPtr< DynInst >
gem5::TimeBuffer
Definition: timebuf.hh:40
gem5::o3::Commit::numROBFreeEntries
size_t numROBFreeEntries(ThreadID tid)
Returns the number of free ROB entries for a specific thread.
Definition: commit.cc:493
gem5::Cycles
Cycles is a wrapper class for representing cycle counts, i.e.
Definition: types.hh:78
gem5::o3::Commit::htmStarts
int htmStarts[MaxThreads]
Definition: commit.hh:461
gem5::o3::Commit::name
std::string name() const
Returns the name of the Commit.
Definition: commit.cc:136
gem5::o3::Commit::stats
gem5::o3::Commit::CommitStats stats
gem5::o3::Commit::CommitStats::branchMispredicts
statistics::Scalar branchMispredicts
Stat for the total number of branch mispredicts that caused a squash.
Definition: commit.hh:478
gem5::o3::Commit::iewStage
IEW * iewStage
The pointer to the IEW stage.
Definition: commit.hh:164
timebuf.hh
gem5::o3::Commit::activeThreads
std::list< ThreadID > * activeThreads
Pointer to the list of active threads.
Definition: commit.hh:443
gem5::o3::Commit::changedROBNumEntries
bool changedROBNumEntries[MaxThreads]
Records if the number of ROB entries has changed this cycle.
Definition: commit.hh:359
gem5::o3::Commit::iewQueue
TimeBuffer< IEWStruct > * iewQueue
IEW instruction queue interface.
Definition: commit.hh:329
comm.hh
gem5::o3::Commit::generateTCEvent
void generateTCEvent(ThreadID tid)
Records that commit needs to initiate a squash due to an external state update through the TC.
Definition: commit.cc:524
gem5::o3::Commit::renameToROBDelay
const Cycles renameToROBDelay
Rename to ROB delay.
Definition: commit.hh:386
gem5::o3::Commit::squashAll
void squashAll(ThreadID tid)
Squashes all in flight instructions.
Definition: commit.cc:533
gem5::o3::Commit::CommitStats::floating
statistics::Vector floating
Total number of floating point instructions.
Definition: commit.hh:499
inst_seq.hh
gem5::o3::CPU
O3CPU class, has each of the stages (fetch through commit) within it, as well as all of the time buff...
Definition: cpu.hh:94
gem5::o3::Commit
Commit handles single threaded and SMT commit.
Definition: commit.hh:91
gem5::o3::Commit::propagateInterrupt
void propagateInterrupt()
Get fetch redirecting so we can handle an interrupt.
Definition: commit.cc:760
gem5::Fault
std::shared_ptr< FaultBase > Fault
Definition: types.hh:248
gem5::o3::Commit::Running
@ Running
Definition: commit.hh:106
gem5::o3::Commit::processTrapEvent
void processTrapEvent(ThreadID tid)
Mark the thread as processing a trap.
Definition: commit.cc:78
gem5::o3::Commit::isDrained
bool isDrained() const
Has the stage drained?
Definition: commit.cc:373
gem5::o3::Commit::rob
ROB * rob
ROB interface.
Definition: commit.hh:342
gem5::o3::Commit::commitStatus
ThreadStatus commitStatus[MaxThreads]
Per-thread status.
Definition: commit.hh:120
gem5::o3::Commit::roundRobin
ThreadID roundRobin()
Returns the thread ID to use based on a round robin policy.
Definition: commit.cc:1473
gem5::o3::Commit::Active
@ Active
Definition: commit.hh:99
gem5::o3::Commit::getInsts
void getInsts()
Gets instructions from rename and inserts them into the ROB.
Definition: commit.cc:1330
gem5::o3::Commit::avoidQuiesceLiveLock
bool avoidQuiesceLiveLock
Have we had an interrupt pending and then seen it de-asserted because of a masking change?...
Definition: commit.hh:455
gem5::o3::Commit::htmStops
int htmStops[MaxThreads]
Definition: commit.hh:462
gem5::o3::Commit::ROBSquashing
@ ROBSquashing
Definition: commit.hh:108
statistics.hh
gem5::o3::IEW
IEW handles both single threaded and SMT IEW (issue/execute/writeback).
Definition: iew.hh:87
gem5::o3::Commit::pc
std::unique_ptr< PCStateBase > pc[MaxThreads]
The commit PC state of each thread.
Definition: commit.hh:424
gem5::o3::Commit::commitHead
bool commitHead(const DynInstPtr &head_inst, unsigned inst_num)
Tries to commit the head ROB instruction passed in.
Definition: commit.cc:1144
gem5::o3::Commit::toIEW
TimeBuffer< TimeStruct >::wire toIEW
Wire to write information heading to previous stages.
Definition: commit.hh:319
gem5::o3::Commit::resetHtmStartsStops
void resetHtmStartsStops(ThreadID)
Definition: commit.cc:435
gem5::o3::Commit::squashAfter
void squashAfter(ThreadID tid, const DynInstPtr &head_inst)
Handle squashing from instruction with SquashAfter set.
Definition: commit.cc:618
gem5::o3::Commit::oldestReady
ThreadID oldestReady()
Returns the thread ID to use based on an oldest instruction policy.
Definition: commit.cc:1500
gem5::o3::Commit::CommitStats::commitSquashedInsts
statistics::Scalar commitSquashedInsts
Stat for the total number of squashed instructions discarded by commit.
Definition: commit.hh:470
gem5::o3::Commit::commitWidth
const unsigned commitWidth
Commit width, in instructions.
Definition: commit.hh:396
gem5::o3::Commit::clearStates
void clearStates(ThreadID tid)
Clear all thread-specific states.
Definition: commit.cc:334
gem5::o3::Commit::thread
std::vector< ThreadState * > thread
Vector of all of the threads.
Definition: commit.hh:349
gem5::o3::Commit::cpu
CPU * cpu
Pointer to O3CPU.
Definition: commit.hh:346
rename_map.hh
gem5::o3::Commit::checkEmptyROB
bool checkEmptyROB[MaxThreads]
Records if commit should check if the ROB is truly empty (see commit_impl.hh).
Definition: commit.hh:440
dyn_inst_ptr.hh
gem5::o3::Commit::CommitStats::integer
statistics::Vector integer
Total number of integer instructions.
Definition: commit.hh:501
gem5::o3::Commit::fromFetch
TimeBuffer< FetchStruct >::wire fromFetch
Definition: commit.hh:326
gem5::o3::Commit::CommitStats::vectorInstructions
statistics::Vector vectorInstructions
Total number of vector instructions.
Definition: commit.hh:497
gem5::o3::Commit::updateComInstStats
void updateComInstStats(const DynInstPtr &inst)
Updates commit stats based on this instruction.
Definition: commit.cc:1383
gem5::o3::Commit::getCommittingThread
ThreadID getCommittingThread()
Gets the thread to commit, based on the SMT policy.
Definition: commit.cc:1445
gem5::ProbePointArg
ProbePointArg generates a point for the class of Arg.
Definition: thermal_domain.hh:54
gem5::o3::Commit::commit
void commit()
Handles any squashes that are sent from IEW, and adds instructions to the ROB and tries to commit ins...
Definition: commit.cc:784
gem5::o3::MaxThreads
static constexpr int MaxThreads
Definition: limits.hh:38
gem5::o3::Commit::CommitStats::amos
statistics::Vector amos
Stat for the total number of committed atomics.
Definition: commit.hh:491
gem5::o3::Commit::drainResume
void drainResume()
Resumes execution after draining.
Definition: commit.cc:351
gem5::o3::Commit::executingHtmTransaction
bool executingHtmTransaction(ThreadID) const
Is the CPU currently processing a HTM transaction?
Definition: commit.cc:426
gem5::o3::Commit::SquashAfterPending
@ SquashAfterPending
Definition: commit.hh:111
gem5::o3::Commit::Idle
@ Idle
Definition: commit.hh:107
gem5::o3::Commit::interrupt
Fault interrupt
The interrupt fault.
Definition: commit.hh:419
gem5::o3::Commit::lastCommitedSeqNum
InstSeqNum lastCommitedSeqNum[MaxThreads]
The sequence number of the last commited instruction.
Definition: commit.hh:430
gem5::o3::Commit::setFetchQueue
void setFetchQueue(TimeBuffer< FetchStruct > *fq_ptr)
Definition: commit.cc:266
gem5::o3::Commit::trapSquash
bool trapSquash[MaxThreads]
Records if a thread has to squash this cycle due to a trap.
Definition: commit.hh:362
gem5::o3::Commit::commitPolicy
CommitPolicy commitPolicy
Commit policy used in SMT mode.
Definition: commit.hh:122
gem5::o3::Commit::trapInFlight
bool trapInFlight[MaxThreads]
Records if there is a trap currently in flight.
Definition: commit.hh:433
gem5::o3::Commit::_status
CommitStatus _status
Overall commit status.
Definition: commit.hh:116
gem5::statistics::Group
Statistics container.
Definition: group.hh:93
gem5::o3::Commit::CommitStats::memRefs
statistics::Vector memRefs
Stat for the total number of committed memory references.
Definition: commit.hh:487
gem5::o3::Commit::_nextStatus
CommitStatus _nextStatus
Next commit status, to be set at the end of the cycle.
Definition: commit.hh:118
gem5::InstSeqNum
uint64_t InstSeqNum
Definition: inst_seq.hh:40
gem5::o3::Commit::CommitStats::opsCommitted
statistics::Vector opsCommitted
Total number of ops (including micro ops) committed.
Definition: commit.hh:485
gem5::o3::Commit::CommitStats::CommitStats
CommitStats(CPU *cpu, Commit *commit)
Definition: commit.cc:149
gem5::o3::Commit::CommitStats::commitNonSpecStalls
statistics::Scalar commitNonSpecStalls
Stat for the total number of times commit has had to stall due to a non-speculative instruction reach...
Definition: commit.hh:474
gem5::o3::Commit::tick
void tick()
Ticks the commit stage, which tries to commit instructions.
Definition: commit.cc:629
gem5::o3::Commit::Inactive
@ Inactive
Definition: commit.hh:100
gem5::PCStateBase
Definition: pcstate.hh:57
gem5::o3::Commit::ppCommitStall
ProbePointArg< DynInstPtr > * ppCommitStall
Definition: commit.hh:126
std::list< ThreadID >
gem5::o3::Commit::youngestSeqNum
InstSeqNum youngestSeqNum[MaxThreads]
The sequence number of the youngest valid instruction in the ROB.
Definition: commit.hh:427
probe.hh
gem5::o3::Commit::CommitStats::functionCalls
statistics::Vector functionCalls
Total number of function calls.
Definition: commit.hh:503
gem5
Reference material can be found at the JEDEC website: UFS standard http://www.jedec....
Definition: gpu_translation_state.hh:37
gem5::o3::Commit::numThreads
const ThreadID numThreads
Number of Active Threads.
Definition: commit.hh:399
limits.hh
gem5::o3::Commit::markCompletedInsts
void markCompletedInsts()
Marks completed instructions using information sent from IEW.
Definition: commit.cc:1363
gem5::o3::Commit::drainImminent
bool drainImminent
Is a drain imminent? Commit has found an instruction boundary while no interrupts were present or in ...
Definition: commit.hh:411
gem5::o3::Commit::updateStatus
void updateStatus()
Updates the overall status of commit with the nextStatus, and tell the CPU if commit is active/inacti...
Definition: commit.cc:446
gem5::o3::ROB
ROB class.
Definition: rob.hh:72
gem5::o3::Commit::setTimeBuffer
void setTimeBuffer(TimeBuffer< TimeStruct > *tb_ptr)
Sets the main time buffer pointer, used for backwards communication.
Definition: commit.cc:254
gem5::o3::Commit::squashFromTrap
void squashFromTrap(ThreadID tid)
Handles squashing due to a trap.
Definition: commit.cc:568
gem5::o3::Commit::trapLatency
const Cycles trapLatency
The latency to handle a trap.
Definition: commit.hh:416
gem5::o3::Commit::canHandleInterrupts
bool canHandleInterrupts
True if last committed microop can be followed by an interrupt.
Definition: commit.hh:449
gem5::o3::Commit::handleInterrupt
void handleInterrupt()
Handles processing an interrupt.
Definition: commit.cc:707
gem5::o3::Commit::setIEWStage
void setIEWStage(IEW *iew_stage)
Sets the pointer to the IEW stage.
Definition: commit.cc:293
gem5::o3::Commit::fromRename
TimeBuffer< RenameStruct >::wire fromRename
Wire to read information from rename queue.
Definition: commit.hh:338
gem5::o3::Commit::CommitStats::branches
statistics::Vector branches
Total number of committed branches.
Definition: commit.hh:495
gem5::o3::Commit::drainSanityCheck
void drainSanityCheck() const
Perform sanity checks after a drain.
Definition: commit.cc:358
gem5::ThreadID
int16_t ThreadID
Thread index/ID type.
Definition: types.hh:235
gem5::TimeBuffer::wire
Definition: timebuf.hh:59
gem5::o3::Commit::CommitStats::membars
statistics::Vector membars
Total number of committed memory barriers.
Definition: commit.hh:493
gem5::o3::UnifiedRenameMap
Unified register rename map for all classes of registers.
Definition: rename_map.hh:168
gem5::o3::Commit::iewToCommitDelay
const Cycles iewToCommitDelay
IEW to Commit delay.
Definition: commit.hh:380
gem5::o3::Commit::pcState
void pcState(const PCStateBase &val, ThreadID tid)
Sets the PC of a specific thread.
Definition: commit.hh:312
gem5::o3::Commit::robInfoFromIEW
TimeBuffer< TimeStruct >::wire robInfoFromIEW
Wire to read information from IEW (for ROB).
Definition: commit.hh:322
gem5::o3::Commit::fetchQueue
TimeBuffer< FetchStruct > * fetchQueue
Definition: commit.hh:324
gem5::o3::Commit::tcSquash
bool tcSquash[MaxThreads]
Records if a thread has to squash this cycle due to an XC write.
Definition: commit.hh:365

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